1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Carsten Otte <Cotte@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Bugreports.to..: <Linux390@de.ibm.com>
8 * Copyright IBM Corp. 1999, 2009
9 * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
10 * Author.........: Nigel Hislop <hislop_nigel@emc.com>
11 */
12
13 #define KMSG_COMPONENT "dasd-eckd"
14
15 #include <linux/stddef.h>
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/hdreg.h> /* HDIO_GETGEO */
19 #include <linux/bio.h>
20 #include <linux/module.h>
21 #include <linux/compat.h>
22 #include <linux/init.h>
23 #include <linux/seq_file.h>
24
25 #include <asm/css_chars.h>
26 #include <asm/debug.h>
27 #include <asm/idals.h>
28 #include <asm/ebcdic.h>
29 #include <asm/io.h>
30 #include <linux/uaccess.h>
31 #include <asm/cio.h>
32 #include <asm/ccwdev.h>
33 #include <asm/itcw.h>
34 #include <asm/schid.h>
35 #include <asm/chpid.h>
36
37 #include "dasd_int.h"
38 #include "dasd_eckd.h"
39
40 #ifdef PRINTK_HEADER
41 #undef PRINTK_HEADER
42 #endif /* PRINTK_HEADER */
43 #define PRINTK_HEADER "dasd(eckd):"
44
45 /*
46 * raw track access always map to 64k in memory
47 * so it maps to 16 blocks of 4k per track
48 */
49 #define DASD_RAW_BLOCK_PER_TRACK 16
50 #define DASD_RAW_BLOCKSIZE 4096
51 /* 64k are 128 x 512 byte sectors */
52 #define DASD_RAW_SECTORS_PER_TRACK 128
53
54 MODULE_LICENSE("GPL");
55
56 static struct dasd_discipline dasd_eckd_discipline;
57
58 /* The ccw bus type uses this table to find devices that it sends to
59 * dasd_eckd_probe */
60 static struct ccw_device_id dasd_eckd_ids[] = {
61 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
62 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
63 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
64 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
65 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
66 { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
67 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
68 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
69 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
70 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
71 { /* end of list */ },
72 };
73
74 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
75
76 static struct ccw_driver dasd_eckd_driver; /* see below */
77
78 static void *rawpadpage;
79
80 #define INIT_CQR_OK 0
81 #define INIT_CQR_UNFORMATTED 1
82 #define INIT_CQR_ERROR 2
83
84 /* emergency request for reserve/release */
85 static struct {
86 struct dasd_ccw_req cqr;
87 struct ccw1 ccw;
88 char data[32];
89 } *dasd_reserve_req;
90 static DEFINE_MUTEX(dasd_reserve_mutex);
91
92 static struct {
93 struct dasd_ccw_req cqr;
94 struct ccw1 ccw[2];
95 char data[40];
96 } *dasd_vol_info_req;
97 static DEFINE_MUTEX(dasd_vol_info_mutex);
98
99 struct ext_pool_exhaust_work_data {
100 struct work_struct worker;
101 struct dasd_device *device;
102 struct dasd_device *base;
103 };
104
105 /* definitions for the path verification worker */
106 struct path_verification_work_data {
107 struct work_struct worker;
108 struct dasd_device *device;
109 struct dasd_ccw_req cqr;
110 struct ccw1 ccw;
111 __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
112 int isglobal;
113 __u8 tbvpm;
114 };
115 static struct path_verification_work_data *path_verification_worker;
116 static DEFINE_MUTEX(dasd_path_verification_mutex);
117
118 struct check_attention_work_data {
119 struct work_struct worker;
120 struct dasd_device *device;
121 __u8 lpum;
122 };
123
124 static int dasd_eckd_ext_pool_id(struct dasd_device *);
125 static int prepare_itcw(struct itcw *, unsigned int, unsigned int, int,
126 struct dasd_device *, struct dasd_device *,
127 unsigned int, int, unsigned int, unsigned int,
128 unsigned int, unsigned int);
129
130 /* initial attempt at a probe function. this can be simplified once
131 * the other detection code is gone */
132 static int
dasd_eckd_probe(struct ccw_device * cdev)133 dasd_eckd_probe (struct ccw_device *cdev)
134 {
135 int ret;
136
137 /* set ECKD specific ccw-device options */
138 ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
139 CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
140 if (ret) {
141 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
142 "dasd_eckd_probe: could not set "
143 "ccw-device options");
144 return ret;
145 }
146 ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
147 return ret;
148 }
149
150 static int
dasd_eckd_set_online(struct ccw_device * cdev)151 dasd_eckd_set_online(struct ccw_device *cdev)
152 {
153 return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
154 }
155
156 static const int sizes_trk0[] = { 28, 148, 84 };
157 #define LABEL_SIZE 140
158
159 /* head and record addresses of count_area read in analysis ccw */
160 static const int count_area_head[] = { 0, 0, 0, 0, 1 };
161 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
162
163 static inline unsigned int
ceil_quot(unsigned int d1,unsigned int d2)164 ceil_quot(unsigned int d1, unsigned int d2)
165 {
166 return (d1 + (d2 - 1)) / d2;
167 }
168
169 static unsigned int
recs_per_track(struct dasd_eckd_characteristics * rdc,unsigned int kl,unsigned int dl)170 recs_per_track(struct dasd_eckd_characteristics * rdc,
171 unsigned int kl, unsigned int dl)
172 {
173 int dn, kn;
174
175 switch (rdc->dev_type) {
176 case 0x3380:
177 if (kl)
178 return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
179 ceil_quot(dl + 12, 32));
180 else
181 return 1499 / (15 + ceil_quot(dl + 12, 32));
182 case 0x3390:
183 dn = ceil_quot(dl + 6, 232) + 1;
184 if (kl) {
185 kn = ceil_quot(kl + 6, 232) + 1;
186 return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
187 9 + ceil_quot(dl + 6 * dn, 34));
188 } else
189 return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
190 case 0x9345:
191 dn = ceil_quot(dl + 6, 232) + 1;
192 if (kl) {
193 kn = ceil_quot(kl + 6, 232) + 1;
194 return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
195 ceil_quot(dl + 6 * dn, 34));
196 } else
197 return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
198 }
199 return 0;
200 }
201
set_ch_t(struct ch_t * geo,__u32 cyl,__u8 head)202 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
203 {
204 geo->cyl = (__u16) cyl;
205 geo->head = cyl >> 16;
206 geo->head <<= 4;
207 geo->head |= head;
208 }
209
210 /*
211 * calculate failing track from sense data depending if
212 * it is an EAV device or not
213 */
dasd_eckd_track_from_irb(struct irb * irb,struct dasd_device * device,sector_t * track)214 static int dasd_eckd_track_from_irb(struct irb *irb, struct dasd_device *device,
215 sector_t *track)
216 {
217 struct dasd_eckd_private *private = device->private;
218 u8 *sense = NULL;
219 u32 cyl;
220 u8 head;
221
222 sense = dasd_get_sense(irb);
223 if (!sense) {
224 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
225 "ESE error no sense data\n");
226 return -EINVAL;
227 }
228 if (!(sense[27] & DASD_SENSE_BIT_2)) {
229 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
230 "ESE error no valid track data\n");
231 return -EINVAL;
232 }
233
234 if (sense[27] & DASD_SENSE_BIT_3) {
235 /* enhanced addressing */
236 cyl = sense[30] << 20;
237 cyl |= (sense[31] & 0xF0) << 12;
238 cyl |= sense[28] << 8;
239 cyl |= sense[29];
240 } else {
241 cyl = sense[29] << 8;
242 cyl |= sense[30];
243 }
244 head = sense[31] & 0x0F;
245 *track = cyl * private->rdc_data.trk_per_cyl + head;
246 return 0;
247 }
248
set_timestamp(struct ccw1 * ccw,struct DE_eckd_data * data,struct dasd_device * device)249 static int set_timestamp(struct ccw1 *ccw, struct DE_eckd_data *data,
250 struct dasd_device *device)
251 {
252 struct dasd_eckd_private *private = device->private;
253 int rc;
254
255 rc = get_phys_clock(&data->ep_sys_time);
256 /*
257 * Ignore return code if XRC is not supported or
258 * sync clock is switched off
259 */
260 if ((rc && !private->rdc_data.facilities.XRC_supported) ||
261 rc == -EOPNOTSUPP || rc == -EACCES)
262 return 0;
263
264 /* switch on System Time Stamp - needed for XRC Support */
265 data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid' */
266 data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
267
268 if (ccw) {
269 ccw->count = sizeof(struct DE_eckd_data);
270 ccw->flags |= CCW_FLAG_SLI;
271 }
272
273 return rc;
274 }
275
276 static int
define_extent(struct ccw1 * ccw,struct DE_eckd_data * data,unsigned int trk,unsigned int totrk,int cmd,struct dasd_device * device,int blksize)277 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
278 unsigned int totrk, int cmd, struct dasd_device *device,
279 int blksize)
280 {
281 struct dasd_eckd_private *private = device->private;
282 u16 heads, beghead, endhead;
283 u32 begcyl, endcyl;
284 int rc = 0;
285
286 if (ccw) {
287 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
288 ccw->flags = 0;
289 ccw->count = 16;
290 ccw->cda = (__u32)__pa(data);
291 }
292
293 memset(data, 0, sizeof(struct DE_eckd_data));
294 switch (cmd) {
295 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
296 case DASD_ECKD_CCW_READ_RECORD_ZERO:
297 case DASD_ECKD_CCW_READ:
298 case DASD_ECKD_CCW_READ_MT:
299 case DASD_ECKD_CCW_READ_CKD:
300 case DASD_ECKD_CCW_READ_CKD_MT:
301 case DASD_ECKD_CCW_READ_KD:
302 case DASD_ECKD_CCW_READ_KD_MT:
303 data->mask.perm = 0x1;
304 data->attributes.operation = private->attrib.operation;
305 break;
306 case DASD_ECKD_CCW_READ_COUNT:
307 data->mask.perm = 0x1;
308 data->attributes.operation = DASD_BYPASS_CACHE;
309 break;
310 case DASD_ECKD_CCW_READ_TRACK:
311 case DASD_ECKD_CCW_READ_TRACK_DATA:
312 data->mask.perm = 0x1;
313 data->attributes.operation = private->attrib.operation;
314 data->blk_size = 0;
315 break;
316 case DASD_ECKD_CCW_WRITE:
317 case DASD_ECKD_CCW_WRITE_MT:
318 case DASD_ECKD_CCW_WRITE_KD:
319 case DASD_ECKD_CCW_WRITE_KD_MT:
320 data->mask.perm = 0x02;
321 data->attributes.operation = private->attrib.operation;
322 rc = set_timestamp(ccw, data, device);
323 break;
324 case DASD_ECKD_CCW_WRITE_CKD:
325 case DASD_ECKD_CCW_WRITE_CKD_MT:
326 data->attributes.operation = DASD_BYPASS_CACHE;
327 rc = set_timestamp(ccw, data, device);
328 break;
329 case DASD_ECKD_CCW_ERASE:
330 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
331 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
332 data->mask.perm = 0x3;
333 data->mask.auth = 0x1;
334 data->attributes.operation = DASD_BYPASS_CACHE;
335 rc = set_timestamp(ccw, data, device);
336 break;
337 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
338 data->mask.perm = 0x03;
339 data->attributes.operation = private->attrib.operation;
340 data->blk_size = 0;
341 break;
342 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
343 data->mask.perm = 0x02;
344 data->attributes.operation = private->attrib.operation;
345 data->blk_size = blksize;
346 rc = set_timestamp(ccw, data, device);
347 break;
348 default:
349 dev_err(&device->cdev->dev,
350 "0x%x is not a known command\n", cmd);
351 break;
352 }
353
354 data->attributes.mode = 0x3; /* ECKD */
355
356 if ((private->rdc_data.cu_type == 0x2105 ||
357 private->rdc_data.cu_type == 0x2107 ||
358 private->rdc_data.cu_type == 0x1750)
359 && !(private->uses_cdl && trk < 2))
360 data->ga_extended |= 0x40; /* Regular Data Format Mode */
361
362 heads = private->rdc_data.trk_per_cyl;
363 begcyl = trk / heads;
364 beghead = trk % heads;
365 endcyl = totrk / heads;
366 endhead = totrk % heads;
367
368 /* check for sequential prestage - enhance cylinder range */
369 if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
370 data->attributes.operation == DASD_SEQ_ACCESS) {
371
372 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
373 endcyl += private->attrib.nr_cyl;
374 else
375 endcyl = (private->real_cyl - 1);
376 }
377
378 set_ch_t(&data->beg_ext, begcyl, beghead);
379 set_ch_t(&data->end_ext, endcyl, endhead);
380 return rc;
381 }
382
383
locate_record_ext(struct ccw1 * ccw,struct LRE_eckd_data * data,unsigned int trk,unsigned int rec_on_trk,int count,int cmd,struct dasd_device * device,unsigned int reclen,unsigned int tlf)384 static void locate_record_ext(struct ccw1 *ccw, struct LRE_eckd_data *data,
385 unsigned int trk, unsigned int rec_on_trk,
386 int count, int cmd, struct dasd_device *device,
387 unsigned int reclen, unsigned int tlf)
388 {
389 struct dasd_eckd_private *private = device->private;
390 int sector;
391 int dn, d;
392
393 if (ccw) {
394 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD_EXT;
395 ccw->flags = 0;
396 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK)
397 ccw->count = 22;
398 else
399 ccw->count = 20;
400 ccw->cda = (__u32)__pa(data);
401 }
402
403 memset(data, 0, sizeof(*data));
404 sector = 0;
405 if (rec_on_trk) {
406 switch (private->rdc_data.dev_type) {
407 case 0x3390:
408 dn = ceil_quot(reclen + 6, 232);
409 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
410 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
411 break;
412 case 0x3380:
413 d = 7 + ceil_quot(reclen + 12, 32);
414 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
415 break;
416 }
417 }
418 data->sector = sector;
419 /* note: meaning of count depends on the operation
420 * for record based I/O it's the number of records, but for
421 * track based I/O it's the number of tracks
422 */
423 data->count = count;
424 switch (cmd) {
425 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
426 data->operation.orientation = 0x3;
427 data->operation.operation = 0x03;
428 break;
429 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
430 data->operation.orientation = 0x3;
431 data->operation.operation = 0x16;
432 break;
433 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
434 data->operation.orientation = 0x1;
435 data->operation.operation = 0x03;
436 data->count++;
437 break;
438 case DASD_ECKD_CCW_READ_RECORD_ZERO:
439 data->operation.orientation = 0x3;
440 data->operation.operation = 0x16;
441 data->count++;
442 break;
443 case DASD_ECKD_CCW_WRITE:
444 case DASD_ECKD_CCW_WRITE_MT:
445 case DASD_ECKD_CCW_WRITE_KD:
446 case DASD_ECKD_CCW_WRITE_KD_MT:
447 data->auxiliary.length_valid = 0x1;
448 data->length = reclen;
449 data->operation.operation = 0x01;
450 break;
451 case DASD_ECKD_CCW_WRITE_CKD:
452 case DASD_ECKD_CCW_WRITE_CKD_MT:
453 data->auxiliary.length_valid = 0x1;
454 data->length = reclen;
455 data->operation.operation = 0x03;
456 break;
457 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
458 data->operation.orientation = 0x0;
459 data->operation.operation = 0x3F;
460 data->extended_operation = 0x11;
461 data->length = 0;
462 data->extended_parameter_length = 0x02;
463 if (data->count > 8) {
464 data->extended_parameter[0] = 0xFF;
465 data->extended_parameter[1] = 0xFF;
466 data->extended_parameter[1] <<= (16 - count);
467 } else {
468 data->extended_parameter[0] = 0xFF;
469 data->extended_parameter[0] <<= (8 - count);
470 data->extended_parameter[1] = 0x00;
471 }
472 data->sector = 0xFF;
473 break;
474 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
475 data->auxiliary.length_valid = 0x1;
476 data->length = reclen; /* not tlf, as one might think */
477 data->operation.operation = 0x3F;
478 data->extended_operation = 0x23;
479 break;
480 case DASD_ECKD_CCW_READ:
481 case DASD_ECKD_CCW_READ_MT:
482 case DASD_ECKD_CCW_READ_KD:
483 case DASD_ECKD_CCW_READ_KD_MT:
484 data->auxiliary.length_valid = 0x1;
485 data->length = reclen;
486 data->operation.operation = 0x06;
487 break;
488 case DASD_ECKD_CCW_READ_CKD:
489 case DASD_ECKD_CCW_READ_CKD_MT:
490 data->auxiliary.length_valid = 0x1;
491 data->length = reclen;
492 data->operation.operation = 0x16;
493 break;
494 case DASD_ECKD_CCW_READ_COUNT:
495 data->operation.operation = 0x06;
496 break;
497 case DASD_ECKD_CCW_READ_TRACK:
498 data->operation.orientation = 0x1;
499 data->operation.operation = 0x0C;
500 data->extended_parameter_length = 0;
501 data->sector = 0xFF;
502 break;
503 case DASD_ECKD_CCW_READ_TRACK_DATA:
504 data->auxiliary.length_valid = 0x1;
505 data->length = tlf;
506 data->operation.operation = 0x0C;
507 break;
508 case DASD_ECKD_CCW_ERASE:
509 data->length = reclen;
510 data->auxiliary.length_valid = 0x1;
511 data->operation.operation = 0x0b;
512 break;
513 default:
514 DBF_DEV_EVENT(DBF_ERR, device,
515 "fill LRE unknown opcode 0x%x", cmd);
516 BUG();
517 }
518 set_ch_t(&data->seek_addr,
519 trk / private->rdc_data.trk_per_cyl,
520 trk % private->rdc_data.trk_per_cyl);
521 data->search_arg.cyl = data->seek_addr.cyl;
522 data->search_arg.head = data->seek_addr.head;
523 data->search_arg.record = rec_on_trk;
524 }
525
prefix_LRE(struct ccw1 * ccw,struct PFX_eckd_data * pfxdata,unsigned int trk,unsigned int totrk,int cmd,struct dasd_device * basedev,struct dasd_device * startdev,unsigned int format,unsigned int rec_on_trk,int count,unsigned int blksize,unsigned int tlf)526 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
527 unsigned int trk, unsigned int totrk, int cmd,
528 struct dasd_device *basedev, struct dasd_device *startdev,
529 unsigned int format, unsigned int rec_on_trk, int count,
530 unsigned int blksize, unsigned int tlf)
531 {
532 struct dasd_eckd_private *basepriv, *startpriv;
533 struct LRE_eckd_data *lredata;
534 struct DE_eckd_data *dedata;
535 int rc = 0;
536
537 basepriv = basedev->private;
538 startpriv = startdev->private;
539 dedata = &pfxdata->define_extent;
540 lredata = &pfxdata->locate_record;
541
542 ccw->cmd_code = DASD_ECKD_CCW_PFX;
543 ccw->flags = 0;
544 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
545 ccw->count = sizeof(*pfxdata) + 2;
546 ccw->cda = (__u32) __pa(pfxdata);
547 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
548 } else {
549 ccw->count = sizeof(*pfxdata);
550 ccw->cda = (__u32) __pa(pfxdata);
551 memset(pfxdata, 0, sizeof(*pfxdata));
552 }
553
554 /* prefix data */
555 if (format > 1) {
556 DBF_DEV_EVENT(DBF_ERR, basedev,
557 "PFX LRE unknown format 0x%x", format);
558 BUG();
559 return -EINVAL;
560 }
561 pfxdata->format = format;
562 pfxdata->base_address = basepriv->ned->unit_addr;
563 pfxdata->base_lss = basepriv->ned->ID;
564 pfxdata->validity.define_extent = 1;
565
566 /* private uid is kept up to date, conf_data may be outdated */
567 if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
568 pfxdata->validity.verify_base = 1;
569
570 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
571 pfxdata->validity.verify_base = 1;
572 pfxdata->validity.hyper_pav = 1;
573 }
574
575 rc = define_extent(NULL, dedata, trk, totrk, cmd, basedev, blksize);
576
577 /*
578 * For some commands the System Time Stamp is set in the define extent
579 * data when XRC is supported. The validity of the time stamp must be
580 * reflected in the prefix data as well.
581 */
582 if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
583 pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid' */
584
585 if (format == 1) {
586 locate_record_ext(NULL, lredata, trk, rec_on_trk, count, cmd,
587 basedev, blksize, tlf);
588 }
589
590 return rc;
591 }
592
prefix(struct ccw1 * ccw,struct PFX_eckd_data * pfxdata,unsigned int trk,unsigned int totrk,int cmd,struct dasd_device * basedev,struct dasd_device * startdev)593 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
594 unsigned int trk, unsigned int totrk, int cmd,
595 struct dasd_device *basedev, struct dasd_device *startdev)
596 {
597 return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
598 0, 0, 0, 0, 0);
599 }
600
601 static void
locate_record(struct ccw1 * ccw,struct LO_eckd_data * data,unsigned int trk,unsigned int rec_on_trk,int no_rec,int cmd,struct dasd_device * device,int reclen)602 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
603 unsigned int rec_on_trk, int no_rec, int cmd,
604 struct dasd_device * device, int reclen)
605 {
606 struct dasd_eckd_private *private = device->private;
607 int sector;
608 int dn, d;
609
610 DBF_DEV_EVENT(DBF_INFO, device,
611 "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
612 trk, rec_on_trk, no_rec, cmd, reclen);
613
614 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
615 ccw->flags = 0;
616 ccw->count = 16;
617 ccw->cda = (__u32) __pa(data);
618
619 memset(data, 0, sizeof(struct LO_eckd_data));
620 sector = 0;
621 if (rec_on_trk) {
622 switch (private->rdc_data.dev_type) {
623 case 0x3390:
624 dn = ceil_quot(reclen + 6, 232);
625 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
626 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
627 break;
628 case 0x3380:
629 d = 7 + ceil_quot(reclen + 12, 32);
630 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
631 break;
632 }
633 }
634 data->sector = sector;
635 data->count = no_rec;
636 switch (cmd) {
637 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
638 data->operation.orientation = 0x3;
639 data->operation.operation = 0x03;
640 break;
641 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
642 data->operation.orientation = 0x3;
643 data->operation.operation = 0x16;
644 break;
645 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
646 data->operation.orientation = 0x1;
647 data->operation.operation = 0x03;
648 data->count++;
649 break;
650 case DASD_ECKD_CCW_READ_RECORD_ZERO:
651 data->operation.orientation = 0x3;
652 data->operation.operation = 0x16;
653 data->count++;
654 break;
655 case DASD_ECKD_CCW_WRITE:
656 case DASD_ECKD_CCW_WRITE_MT:
657 case DASD_ECKD_CCW_WRITE_KD:
658 case DASD_ECKD_CCW_WRITE_KD_MT:
659 data->auxiliary.last_bytes_used = 0x1;
660 data->length = reclen;
661 data->operation.operation = 0x01;
662 break;
663 case DASD_ECKD_CCW_WRITE_CKD:
664 case DASD_ECKD_CCW_WRITE_CKD_MT:
665 data->auxiliary.last_bytes_used = 0x1;
666 data->length = reclen;
667 data->operation.operation = 0x03;
668 break;
669 case DASD_ECKD_CCW_READ:
670 case DASD_ECKD_CCW_READ_MT:
671 case DASD_ECKD_CCW_READ_KD:
672 case DASD_ECKD_CCW_READ_KD_MT:
673 data->auxiliary.last_bytes_used = 0x1;
674 data->length = reclen;
675 data->operation.operation = 0x06;
676 break;
677 case DASD_ECKD_CCW_READ_CKD:
678 case DASD_ECKD_CCW_READ_CKD_MT:
679 data->auxiliary.last_bytes_used = 0x1;
680 data->length = reclen;
681 data->operation.operation = 0x16;
682 break;
683 case DASD_ECKD_CCW_READ_COUNT:
684 data->operation.operation = 0x06;
685 break;
686 case DASD_ECKD_CCW_ERASE:
687 data->length = reclen;
688 data->auxiliary.last_bytes_used = 0x1;
689 data->operation.operation = 0x0b;
690 break;
691 default:
692 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
693 "opcode 0x%x", cmd);
694 }
695 set_ch_t(&data->seek_addr,
696 trk / private->rdc_data.trk_per_cyl,
697 trk % private->rdc_data.trk_per_cyl);
698 data->search_arg.cyl = data->seek_addr.cyl;
699 data->search_arg.head = data->seek_addr.head;
700 data->search_arg.record = rec_on_trk;
701 }
702
703 /*
704 * Returns 1 if the block is one of the special blocks that needs
705 * to get read/written with the KD variant of the command.
706 * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
707 * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
708 * Luckily the KD variants differ only by one bit (0x08) from the
709 * normal variant. So don't wonder about code like:
710 * if (dasd_eckd_cdl_special(blk_per_trk, recid))
711 * ccw->cmd_code |= 0x8;
712 */
713 static inline int
dasd_eckd_cdl_special(int blk_per_trk,int recid)714 dasd_eckd_cdl_special(int blk_per_trk, int recid)
715 {
716 if (recid < 3)
717 return 1;
718 if (recid < blk_per_trk)
719 return 0;
720 if (recid < 2 * blk_per_trk)
721 return 1;
722 return 0;
723 }
724
725 /*
726 * Returns the record size for the special blocks of the cdl format.
727 * Only returns something useful if dasd_eckd_cdl_special is true
728 * for the recid.
729 */
730 static inline int
dasd_eckd_cdl_reclen(int recid)731 dasd_eckd_cdl_reclen(int recid)
732 {
733 if (recid < 3)
734 return sizes_trk0[recid];
735 return LABEL_SIZE;
736 }
737 /* create unique id from private structure. */
create_uid(struct dasd_eckd_private * private)738 static void create_uid(struct dasd_eckd_private *private)
739 {
740 int count;
741 struct dasd_uid *uid;
742
743 uid = &private->uid;
744 memset(uid, 0, sizeof(struct dasd_uid));
745 memcpy(uid->vendor, private->ned->HDA_manufacturer,
746 sizeof(uid->vendor) - 1);
747 EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
748 memcpy(uid->serial, private->ned->HDA_location,
749 sizeof(uid->serial) - 1);
750 EBCASC(uid->serial, sizeof(uid->serial) - 1);
751 uid->ssid = private->gneq->subsystemID;
752 uid->real_unit_addr = private->ned->unit_addr;
753 if (private->sneq) {
754 uid->type = private->sneq->sua_flags;
755 if (uid->type == UA_BASE_PAV_ALIAS)
756 uid->base_unit_addr = private->sneq->base_unit_addr;
757 } else {
758 uid->type = UA_BASE_DEVICE;
759 }
760 if (private->vdsneq) {
761 for (count = 0; count < 16; count++) {
762 sprintf(uid->vduit+2*count, "%02x",
763 private->vdsneq->uit[count]);
764 }
765 }
766 }
767
768 /*
769 * Generate device unique id that specifies the physical device.
770 */
dasd_eckd_generate_uid(struct dasd_device * device)771 static int dasd_eckd_generate_uid(struct dasd_device *device)
772 {
773 struct dasd_eckd_private *private = device->private;
774 unsigned long flags;
775
776 if (!private)
777 return -ENODEV;
778 if (!private->ned || !private->gneq)
779 return -ENODEV;
780 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
781 create_uid(private);
782 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
783 return 0;
784 }
785
dasd_eckd_get_uid(struct dasd_device * device,struct dasd_uid * uid)786 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
787 {
788 struct dasd_eckd_private *private = device->private;
789 unsigned long flags;
790
791 if (private) {
792 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
793 *uid = private->uid;
794 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
795 return 0;
796 }
797 return -EINVAL;
798 }
799
800 /*
801 * compare device UID with data of a given dasd_eckd_private structure
802 * return 0 for match
803 */
dasd_eckd_compare_path_uid(struct dasd_device * device,struct dasd_eckd_private * private)804 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
805 struct dasd_eckd_private *private)
806 {
807 struct dasd_uid device_uid;
808
809 create_uid(private);
810 dasd_eckd_get_uid(device, &device_uid);
811
812 return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
813 }
814
dasd_eckd_fill_rcd_cqr(struct dasd_device * device,struct dasd_ccw_req * cqr,__u8 * rcd_buffer,__u8 lpm)815 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
816 struct dasd_ccw_req *cqr,
817 __u8 *rcd_buffer,
818 __u8 lpm)
819 {
820 struct ccw1 *ccw;
821 /*
822 * buffer has to start with EBCDIC "V1.0" to show
823 * support for virtual device SNEQ
824 */
825 rcd_buffer[0] = 0xE5;
826 rcd_buffer[1] = 0xF1;
827 rcd_buffer[2] = 0x4B;
828 rcd_buffer[3] = 0xF0;
829
830 ccw = cqr->cpaddr;
831 ccw->cmd_code = DASD_ECKD_CCW_RCD;
832 ccw->flags = 0;
833 ccw->cda = (__u32)(addr_t)rcd_buffer;
834 ccw->count = DASD_ECKD_RCD_DATA_SIZE;
835 cqr->magic = DASD_ECKD_MAGIC;
836
837 cqr->startdev = device;
838 cqr->memdev = device;
839 cqr->block = NULL;
840 cqr->expires = 10*HZ;
841 cqr->lpm = lpm;
842 cqr->retries = 256;
843 cqr->buildclk = get_tod_clock();
844 cqr->status = DASD_CQR_FILLED;
845 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
846 }
847
848 /*
849 * Wakeup helper for read_conf
850 * if the cqr is not done and needs some error recovery
851 * the buffer has to be re-initialized with the EBCDIC "V1.0"
852 * to show support for virtual device SNEQ
853 */
read_conf_cb(struct dasd_ccw_req * cqr,void * data)854 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
855 {
856 struct ccw1 *ccw;
857 __u8 *rcd_buffer;
858
859 if (cqr->status != DASD_CQR_DONE) {
860 ccw = cqr->cpaddr;
861 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
862 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
863
864 rcd_buffer[0] = 0xE5;
865 rcd_buffer[1] = 0xF1;
866 rcd_buffer[2] = 0x4B;
867 rcd_buffer[3] = 0xF0;
868 }
869 dasd_wakeup_cb(cqr, data);
870 }
871
dasd_eckd_read_conf_immediately(struct dasd_device * device,struct dasd_ccw_req * cqr,__u8 * rcd_buffer,__u8 lpm)872 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
873 struct dasd_ccw_req *cqr,
874 __u8 *rcd_buffer,
875 __u8 lpm)
876 {
877 struct ciw *ciw;
878 int rc;
879 /*
880 * sanity check: scan for RCD command in extended SenseID data
881 * some devices do not support RCD
882 */
883 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
884 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
885 return -EOPNOTSUPP;
886
887 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
888 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
889 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
890 cqr->retries = 5;
891 cqr->callback = read_conf_cb;
892 rc = dasd_sleep_on_immediatly(cqr);
893 return rc;
894 }
895
dasd_eckd_read_conf_lpm(struct dasd_device * device,void ** rcd_buffer,int * rcd_buffer_size,__u8 lpm)896 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
897 void **rcd_buffer,
898 int *rcd_buffer_size, __u8 lpm)
899 {
900 struct ciw *ciw;
901 char *rcd_buf = NULL;
902 int ret;
903 struct dasd_ccw_req *cqr;
904
905 /*
906 * sanity check: scan for RCD command in extended SenseID data
907 * some devices do not support RCD
908 */
909 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
910 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
911 ret = -EOPNOTSUPP;
912 goto out_error;
913 }
914 rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
915 if (!rcd_buf) {
916 ret = -ENOMEM;
917 goto out_error;
918 }
919 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
920 0, /* use rcd_buf as data ara */
921 device, NULL);
922 if (IS_ERR(cqr)) {
923 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
924 "Could not allocate RCD request");
925 ret = -ENOMEM;
926 goto out_error;
927 }
928 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
929 cqr->callback = read_conf_cb;
930 ret = dasd_sleep_on(cqr);
931 /*
932 * on success we update the user input parms
933 */
934 dasd_sfree_request(cqr, cqr->memdev);
935 if (ret)
936 goto out_error;
937
938 *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
939 *rcd_buffer = rcd_buf;
940 return 0;
941 out_error:
942 kfree(rcd_buf);
943 *rcd_buffer = NULL;
944 *rcd_buffer_size = 0;
945 return ret;
946 }
947
dasd_eckd_identify_conf_parts(struct dasd_eckd_private * private)948 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
949 {
950
951 struct dasd_sneq *sneq;
952 int i, count;
953
954 private->ned = NULL;
955 private->sneq = NULL;
956 private->vdsneq = NULL;
957 private->gneq = NULL;
958 count = private->conf_len / sizeof(struct dasd_sneq);
959 sneq = (struct dasd_sneq *)private->conf_data;
960 for (i = 0; i < count; ++i) {
961 if (sneq->flags.identifier == 1 && sneq->format == 1)
962 private->sneq = sneq;
963 else if (sneq->flags.identifier == 1 && sneq->format == 4)
964 private->vdsneq = (struct vd_sneq *)sneq;
965 else if (sneq->flags.identifier == 2)
966 private->gneq = (struct dasd_gneq *)sneq;
967 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
968 private->ned = (struct dasd_ned *)sneq;
969 sneq++;
970 }
971 if (!private->ned || !private->gneq) {
972 private->ned = NULL;
973 private->sneq = NULL;
974 private->vdsneq = NULL;
975 private->gneq = NULL;
976 return -EINVAL;
977 }
978 return 0;
979
980 };
981
dasd_eckd_path_access(void * conf_data,int conf_len)982 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
983 {
984 struct dasd_gneq *gneq;
985 int i, count, found;
986
987 count = conf_len / sizeof(*gneq);
988 gneq = (struct dasd_gneq *)conf_data;
989 found = 0;
990 for (i = 0; i < count; ++i) {
991 if (gneq->flags.identifier == 2) {
992 found = 1;
993 break;
994 }
995 gneq++;
996 }
997 if (found)
998 return ((char *)gneq)[18] & 0x07;
999 else
1000 return 0;
1001 }
1002
dasd_eckd_clear_conf_data(struct dasd_device * device)1003 static void dasd_eckd_clear_conf_data(struct dasd_device *device)
1004 {
1005 struct dasd_eckd_private *private = device->private;
1006 int i;
1007
1008 private->conf_data = NULL;
1009 private->conf_len = 0;
1010 for (i = 0; i < 8; i++) {
1011 kfree(device->path[i].conf_data);
1012 device->path[i].conf_data = NULL;
1013 device->path[i].cssid = 0;
1014 device->path[i].ssid = 0;
1015 device->path[i].chpid = 0;
1016 }
1017 }
1018
1019
dasd_eckd_read_conf(struct dasd_device * device)1020 static int dasd_eckd_read_conf(struct dasd_device *device)
1021 {
1022 void *conf_data;
1023 int conf_len, conf_data_saved;
1024 int rc, path_err, pos;
1025 __u8 lpm, opm;
1026 struct dasd_eckd_private *private, path_private;
1027 struct dasd_uid *uid;
1028 char print_path_uid[60], print_device_uid[60];
1029 struct channel_path_desc_fmt0 *chp_desc;
1030 struct subchannel_id sch_id;
1031
1032 private = device->private;
1033 opm = ccw_device_get_path_mask(device->cdev);
1034 ccw_device_get_schid(device->cdev, &sch_id);
1035 conf_data_saved = 0;
1036 path_err = 0;
1037 /* get configuration data per operational path */
1038 for (lpm = 0x80; lpm; lpm>>= 1) {
1039 if (!(lpm & opm))
1040 continue;
1041 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1042 &conf_len, lpm);
1043 if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */
1044 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1045 "Read configuration data returned "
1046 "error %d", rc);
1047 return rc;
1048 }
1049 if (conf_data == NULL) {
1050 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1051 "No configuration data "
1052 "retrieved");
1053 /* no further analysis possible */
1054 dasd_path_add_opm(device, opm);
1055 continue; /* no error */
1056 }
1057 /* save first valid configuration data */
1058 if (!conf_data_saved) {
1059 /* initially clear previously stored conf_data */
1060 dasd_eckd_clear_conf_data(device);
1061 private->conf_data = conf_data;
1062 private->conf_len = conf_len;
1063 if (dasd_eckd_identify_conf_parts(private)) {
1064 private->conf_data = NULL;
1065 private->conf_len = 0;
1066 kfree(conf_data);
1067 continue;
1068 }
1069 pos = pathmask_to_pos(lpm);
1070 /* store per path conf_data */
1071 device->path[pos].conf_data = conf_data;
1072 device->path[pos].cssid = sch_id.cssid;
1073 device->path[pos].ssid = sch_id.ssid;
1074 chp_desc = ccw_device_get_chp_desc(device->cdev, pos);
1075 if (chp_desc)
1076 device->path[pos].chpid = chp_desc->chpid;
1077 kfree(chp_desc);
1078 /*
1079 * build device UID that other path data
1080 * can be compared to it
1081 */
1082 dasd_eckd_generate_uid(device);
1083 conf_data_saved++;
1084 } else {
1085 path_private.conf_data = conf_data;
1086 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1087 if (dasd_eckd_identify_conf_parts(
1088 &path_private)) {
1089 path_private.conf_data = NULL;
1090 path_private.conf_len = 0;
1091 kfree(conf_data);
1092 continue;
1093 }
1094 if (dasd_eckd_compare_path_uid(
1095 device, &path_private)) {
1096 uid = &path_private.uid;
1097 if (strlen(uid->vduit) > 0)
1098 snprintf(print_path_uid,
1099 sizeof(print_path_uid),
1100 "%s.%s.%04x.%02x.%s",
1101 uid->vendor, uid->serial,
1102 uid->ssid, uid->real_unit_addr,
1103 uid->vduit);
1104 else
1105 snprintf(print_path_uid,
1106 sizeof(print_path_uid),
1107 "%s.%s.%04x.%02x",
1108 uid->vendor, uid->serial,
1109 uid->ssid,
1110 uid->real_unit_addr);
1111 uid = &private->uid;
1112 if (strlen(uid->vduit) > 0)
1113 snprintf(print_device_uid,
1114 sizeof(print_device_uid),
1115 "%s.%s.%04x.%02x.%s",
1116 uid->vendor, uid->serial,
1117 uid->ssid, uid->real_unit_addr,
1118 uid->vduit);
1119 else
1120 snprintf(print_device_uid,
1121 sizeof(print_device_uid),
1122 "%s.%s.%04x.%02x",
1123 uid->vendor, uid->serial,
1124 uid->ssid,
1125 uid->real_unit_addr);
1126 dev_err(&device->cdev->dev,
1127 "Not all channel paths lead to "
1128 "the same device, path %02X leads to "
1129 "device %s instead of %s\n", lpm,
1130 print_path_uid, print_device_uid);
1131 path_err = -EINVAL;
1132 dasd_path_add_cablepm(device, lpm);
1133 continue;
1134 }
1135 pos = pathmask_to_pos(lpm);
1136 /* store per path conf_data */
1137 device->path[pos].conf_data = conf_data;
1138 device->path[pos].cssid = sch_id.cssid;
1139 device->path[pos].ssid = sch_id.ssid;
1140 chp_desc = ccw_device_get_chp_desc(device->cdev, pos);
1141 if (chp_desc)
1142 device->path[pos].chpid = chp_desc->chpid;
1143 kfree(chp_desc);
1144 path_private.conf_data = NULL;
1145 path_private.conf_len = 0;
1146 }
1147 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1148 case 0x02:
1149 dasd_path_add_nppm(device, lpm);
1150 break;
1151 case 0x03:
1152 dasd_path_add_ppm(device, lpm);
1153 break;
1154 }
1155 if (!dasd_path_get_opm(device)) {
1156 dasd_path_set_opm(device, lpm);
1157 dasd_generic_path_operational(device);
1158 } else {
1159 dasd_path_add_opm(device, lpm);
1160 }
1161 }
1162
1163 return path_err;
1164 }
1165
get_fcx_max_data(struct dasd_device * device)1166 static u32 get_fcx_max_data(struct dasd_device *device)
1167 {
1168 struct dasd_eckd_private *private = device->private;
1169 int fcx_in_css, fcx_in_gneq, fcx_in_features;
1170 unsigned int mdc;
1171 int tpm;
1172
1173 if (dasd_nofcx)
1174 return 0;
1175 /* is transport mode supported? */
1176 fcx_in_css = css_general_characteristics.fcx;
1177 fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1178 fcx_in_features = private->features.feature[40] & 0x80;
1179 tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1180
1181 if (!tpm)
1182 return 0;
1183
1184 mdc = ccw_device_get_mdc(device->cdev, 0);
1185 if (mdc == 0) {
1186 dev_warn(&device->cdev->dev, "Detecting the maximum supported data size for zHPF requests failed\n");
1187 return 0;
1188 } else {
1189 return (u32)mdc * FCX_MAX_DATA_FACTOR;
1190 }
1191 }
1192
verify_fcx_max_data(struct dasd_device * device,__u8 lpm)1193 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1194 {
1195 struct dasd_eckd_private *private = device->private;
1196 unsigned int mdc;
1197 u32 fcx_max_data;
1198
1199 if (private->fcx_max_data) {
1200 mdc = ccw_device_get_mdc(device->cdev, lpm);
1201 if (mdc == 0) {
1202 dev_warn(&device->cdev->dev,
1203 "Detecting the maximum data size for zHPF "
1204 "requests failed (rc=%d) for a new path %x\n",
1205 mdc, lpm);
1206 return mdc;
1207 }
1208 fcx_max_data = (u32)mdc * FCX_MAX_DATA_FACTOR;
1209 if (fcx_max_data < private->fcx_max_data) {
1210 dev_warn(&device->cdev->dev,
1211 "The maximum data size for zHPF requests %u "
1212 "on a new path %x is below the active maximum "
1213 "%u\n", fcx_max_data, lpm,
1214 private->fcx_max_data);
1215 return -EACCES;
1216 }
1217 }
1218 return 0;
1219 }
1220
rebuild_device_uid(struct dasd_device * device,struct path_verification_work_data * data)1221 static int rebuild_device_uid(struct dasd_device *device,
1222 struct path_verification_work_data *data)
1223 {
1224 struct dasd_eckd_private *private = device->private;
1225 __u8 lpm, opm = dasd_path_get_opm(device);
1226 int rc = -ENODEV;
1227
1228 for (lpm = 0x80; lpm; lpm >>= 1) {
1229 if (!(lpm & opm))
1230 continue;
1231 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1232 memset(&data->cqr, 0, sizeof(data->cqr));
1233 data->cqr.cpaddr = &data->ccw;
1234 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1235 data->rcd_buffer,
1236 lpm);
1237
1238 if (rc) {
1239 if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1240 continue;
1241 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1242 "Read configuration data "
1243 "returned error %d", rc);
1244 break;
1245 }
1246 memcpy(private->conf_data, data->rcd_buffer,
1247 DASD_ECKD_RCD_DATA_SIZE);
1248 if (dasd_eckd_identify_conf_parts(private)) {
1249 rc = -ENODEV;
1250 } else /* first valid path is enough */
1251 break;
1252 }
1253
1254 if (!rc)
1255 rc = dasd_eckd_generate_uid(device);
1256
1257 return rc;
1258 }
1259
do_path_verification_work(struct work_struct * work)1260 static void do_path_verification_work(struct work_struct *work)
1261 {
1262 struct path_verification_work_data *data;
1263 struct dasd_device *device;
1264 struct dasd_eckd_private path_private;
1265 struct dasd_uid *uid;
1266 __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1267 __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1268 unsigned long flags;
1269 char print_uid[60];
1270 int rc;
1271
1272 data = container_of(work, struct path_verification_work_data, worker);
1273 device = data->device;
1274
1275 /* delay path verification until device was resumed */
1276 if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1277 schedule_work(work);
1278 return;
1279 }
1280 /* check if path verification already running and delay if so */
1281 if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
1282 schedule_work(work);
1283 return;
1284 }
1285 opm = 0;
1286 npm = 0;
1287 ppm = 0;
1288 epm = 0;
1289 hpfpm = 0;
1290 cablepm = 0;
1291
1292 for (lpm = 0x80; lpm; lpm >>= 1) {
1293 if (!(lpm & data->tbvpm))
1294 continue;
1295 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1296 memset(&data->cqr, 0, sizeof(data->cqr));
1297 data->cqr.cpaddr = &data->ccw;
1298 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1299 data->rcd_buffer,
1300 lpm);
1301 if (!rc) {
1302 switch (dasd_eckd_path_access(data->rcd_buffer,
1303 DASD_ECKD_RCD_DATA_SIZE)
1304 ) {
1305 case 0x02:
1306 npm |= lpm;
1307 break;
1308 case 0x03:
1309 ppm |= lpm;
1310 break;
1311 }
1312 opm |= lpm;
1313 } else if (rc == -EOPNOTSUPP) {
1314 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1315 "path verification: No configuration "
1316 "data retrieved");
1317 opm |= lpm;
1318 } else if (rc == -EAGAIN) {
1319 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1320 "path verification: device is stopped,"
1321 " try again later");
1322 epm |= lpm;
1323 } else {
1324 dev_warn(&device->cdev->dev,
1325 "Reading device feature codes failed "
1326 "(rc=%d) for new path %x\n", rc, lpm);
1327 continue;
1328 }
1329 if (verify_fcx_max_data(device, lpm)) {
1330 opm &= ~lpm;
1331 npm &= ~lpm;
1332 ppm &= ~lpm;
1333 hpfpm |= lpm;
1334 continue;
1335 }
1336
1337 /*
1338 * save conf_data for comparison after
1339 * rebuild_device_uid may have changed
1340 * the original data
1341 */
1342 memcpy(&path_rcd_buf, data->rcd_buffer,
1343 DASD_ECKD_RCD_DATA_SIZE);
1344 path_private.conf_data = (void *) &path_rcd_buf;
1345 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1346 if (dasd_eckd_identify_conf_parts(&path_private)) {
1347 path_private.conf_data = NULL;
1348 path_private.conf_len = 0;
1349 continue;
1350 }
1351
1352 /*
1353 * compare path UID with device UID only if at least
1354 * one valid path is left
1355 * in other case the device UID may have changed and
1356 * the first working path UID will be used as device UID
1357 */
1358 if (dasd_path_get_opm(device) &&
1359 dasd_eckd_compare_path_uid(device, &path_private)) {
1360 /*
1361 * the comparison was not successful
1362 * rebuild the device UID with at least one
1363 * known path in case a z/VM hyperswap command
1364 * has changed the device
1365 *
1366 * after this compare again
1367 *
1368 * if either the rebuild or the recompare fails
1369 * the path can not be used
1370 */
1371 if (rebuild_device_uid(device, data) ||
1372 dasd_eckd_compare_path_uid(
1373 device, &path_private)) {
1374 uid = &path_private.uid;
1375 if (strlen(uid->vduit) > 0)
1376 snprintf(print_uid, sizeof(print_uid),
1377 "%s.%s.%04x.%02x.%s",
1378 uid->vendor, uid->serial,
1379 uid->ssid, uid->real_unit_addr,
1380 uid->vduit);
1381 else
1382 snprintf(print_uid, sizeof(print_uid),
1383 "%s.%s.%04x.%02x",
1384 uid->vendor, uid->serial,
1385 uid->ssid,
1386 uid->real_unit_addr);
1387 dev_err(&device->cdev->dev,
1388 "The newly added channel path %02X "
1389 "will not be used because it leads "
1390 "to a different device %s\n",
1391 lpm, print_uid);
1392 opm &= ~lpm;
1393 npm &= ~lpm;
1394 ppm &= ~lpm;
1395 cablepm |= lpm;
1396 continue;
1397 }
1398 }
1399
1400 /*
1401 * There is a small chance that a path is lost again between
1402 * above path verification and the following modification of
1403 * the device opm mask. We could avoid that race here by using
1404 * yet another path mask, but we rather deal with this unlikely
1405 * situation in dasd_start_IO.
1406 */
1407 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1408 if (!dasd_path_get_opm(device) && opm) {
1409 dasd_path_set_opm(device, opm);
1410 dasd_generic_path_operational(device);
1411 } else {
1412 dasd_path_add_opm(device, opm);
1413 }
1414 dasd_path_add_nppm(device, npm);
1415 dasd_path_add_ppm(device, ppm);
1416 dasd_path_add_tbvpm(device, epm);
1417 dasd_path_add_cablepm(device, cablepm);
1418 dasd_path_add_nohpfpm(device, hpfpm);
1419 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1420 }
1421 clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
1422 dasd_put_device(device);
1423 if (data->isglobal)
1424 mutex_unlock(&dasd_path_verification_mutex);
1425 else
1426 kfree(data);
1427 }
1428
dasd_eckd_verify_path(struct dasd_device * device,__u8 lpm)1429 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1430 {
1431 struct path_verification_work_data *data;
1432
1433 data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1434 if (!data) {
1435 if (mutex_trylock(&dasd_path_verification_mutex)) {
1436 data = path_verification_worker;
1437 data->isglobal = 1;
1438 } else
1439 return -ENOMEM;
1440 } else {
1441 memset(data, 0, sizeof(*data));
1442 data->isglobal = 0;
1443 }
1444 INIT_WORK(&data->worker, do_path_verification_work);
1445 dasd_get_device(device);
1446 data->device = device;
1447 data->tbvpm = lpm;
1448 schedule_work(&data->worker);
1449 return 0;
1450 }
1451
dasd_eckd_reset_path(struct dasd_device * device,__u8 pm)1452 static void dasd_eckd_reset_path(struct dasd_device *device, __u8 pm)
1453 {
1454 struct dasd_eckd_private *private = device->private;
1455 unsigned long flags;
1456
1457 if (!private->fcx_max_data)
1458 private->fcx_max_data = get_fcx_max_data(device);
1459 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1460 dasd_path_set_tbvpm(device, pm ? : dasd_path_get_notoperpm(device));
1461 dasd_schedule_device_bh(device);
1462 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1463 }
1464
dasd_eckd_read_features(struct dasd_device * device)1465 static int dasd_eckd_read_features(struct dasd_device *device)
1466 {
1467 struct dasd_eckd_private *private = device->private;
1468 struct dasd_psf_prssd_data *prssdp;
1469 struct dasd_rssd_features *features;
1470 struct dasd_ccw_req *cqr;
1471 struct ccw1 *ccw;
1472 int rc;
1473
1474 memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1475 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1476 (sizeof(struct dasd_psf_prssd_data) +
1477 sizeof(struct dasd_rssd_features)),
1478 device, NULL);
1479 if (IS_ERR(cqr)) {
1480 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1481 "allocate initialization request");
1482 return PTR_ERR(cqr);
1483 }
1484 cqr->startdev = device;
1485 cqr->memdev = device;
1486 cqr->block = NULL;
1487 cqr->retries = 256;
1488 cqr->expires = 10 * HZ;
1489
1490 /* Prepare for Read Subsystem Data */
1491 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1492 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1493 prssdp->order = PSF_ORDER_PRSSD;
1494 prssdp->suborder = 0x41; /* Read Feature Codes */
1495 /* all other bytes of prssdp must be zero */
1496
1497 ccw = cqr->cpaddr;
1498 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1499 ccw->count = sizeof(struct dasd_psf_prssd_data);
1500 ccw->flags |= CCW_FLAG_CC;
1501 ccw->cda = (__u32)(addr_t) prssdp;
1502
1503 /* Read Subsystem Data - feature codes */
1504 features = (struct dasd_rssd_features *) (prssdp + 1);
1505 memset(features, 0, sizeof(struct dasd_rssd_features));
1506
1507 ccw++;
1508 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1509 ccw->count = sizeof(struct dasd_rssd_features);
1510 ccw->cda = (__u32)(addr_t) features;
1511
1512 cqr->buildclk = get_tod_clock();
1513 cqr->status = DASD_CQR_FILLED;
1514 rc = dasd_sleep_on(cqr);
1515 if (rc == 0) {
1516 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1517 features = (struct dasd_rssd_features *) (prssdp + 1);
1518 memcpy(&private->features, features,
1519 sizeof(struct dasd_rssd_features));
1520 } else
1521 dev_warn(&device->cdev->dev, "Reading device feature codes"
1522 " failed with rc=%d\n", rc);
1523 dasd_sfree_request(cqr, cqr->memdev);
1524 return rc;
1525 }
1526
1527 /* Read Volume Information - Volume Storage Query */
dasd_eckd_read_vol_info(struct dasd_device * device)1528 static int dasd_eckd_read_vol_info(struct dasd_device *device)
1529 {
1530 struct dasd_eckd_private *private = device->private;
1531 struct dasd_psf_prssd_data *prssdp;
1532 struct dasd_rssd_vsq *vsq;
1533 struct dasd_ccw_req *cqr;
1534 struct ccw1 *ccw;
1535 int useglobal;
1536 int rc;
1537
1538 /* This command cannot be executed on an alias device */
1539 if (private->uid.type == UA_BASE_PAV_ALIAS ||
1540 private->uid.type == UA_HYPER_PAV_ALIAS)
1541 return 0;
1542
1543 useglobal = 0;
1544 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 /* PSF + RSSD */,
1545 sizeof(*prssdp) + sizeof(*vsq), device, NULL);
1546 if (IS_ERR(cqr)) {
1547 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1548 "Could not allocate initialization request");
1549 mutex_lock(&dasd_vol_info_mutex);
1550 useglobal = 1;
1551 cqr = &dasd_vol_info_req->cqr;
1552 memset(cqr, 0, sizeof(*cqr));
1553 memset(dasd_vol_info_req, 0, sizeof(*dasd_vol_info_req));
1554 cqr->cpaddr = &dasd_vol_info_req->ccw;
1555 cqr->data = &dasd_vol_info_req->data;
1556 cqr->magic = DASD_ECKD_MAGIC;
1557 }
1558
1559 /* Prepare for Read Subsystem Data */
1560 prssdp = cqr->data;
1561 prssdp->order = PSF_ORDER_PRSSD;
1562 prssdp->suborder = PSF_SUBORDER_VSQ; /* Volume Storage Query */
1563 prssdp->lss = private->ned->ID;
1564 prssdp->volume = private->ned->unit_addr;
1565
1566 ccw = cqr->cpaddr;
1567 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1568 ccw->count = sizeof(*prssdp);
1569 ccw->flags |= CCW_FLAG_CC;
1570 ccw->cda = (__u32)(addr_t)prssdp;
1571
1572 /* Read Subsystem Data - Volume Storage Query */
1573 vsq = (struct dasd_rssd_vsq *)(prssdp + 1);
1574 memset(vsq, 0, sizeof(*vsq));
1575
1576 ccw++;
1577 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1578 ccw->count = sizeof(*vsq);
1579 ccw->flags |= CCW_FLAG_SLI;
1580 ccw->cda = (__u32)(addr_t)vsq;
1581
1582 cqr->buildclk = get_tod_clock();
1583 cqr->status = DASD_CQR_FILLED;
1584 cqr->startdev = device;
1585 cqr->memdev = device;
1586 cqr->block = NULL;
1587 cqr->retries = 256;
1588 cqr->expires = device->default_expires * HZ;
1589 /* The command might not be supported. Suppress the error output */
1590 __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
1591
1592 rc = dasd_sleep_on_interruptible(cqr);
1593 if (rc == 0) {
1594 memcpy(&private->vsq, vsq, sizeof(*vsq));
1595 } else {
1596 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1597 "Reading the volume storage information failed with rc=%d", rc);
1598 }
1599
1600 if (useglobal)
1601 mutex_unlock(&dasd_vol_info_mutex);
1602 else
1603 dasd_sfree_request(cqr, cqr->memdev);
1604
1605 return rc;
1606 }
1607
dasd_eckd_is_ese(struct dasd_device * device)1608 static int dasd_eckd_is_ese(struct dasd_device *device)
1609 {
1610 struct dasd_eckd_private *private = device->private;
1611
1612 return private->vsq.vol_info.ese;
1613 }
1614
dasd_eckd_ext_pool_id(struct dasd_device * device)1615 static int dasd_eckd_ext_pool_id(struct dasd_device *device)
1616 {
1617 struct dasd_eckd_private *private = device->private;
1618
1619 return private->vsq.extent_pool_id;
1620 }
1621
1622 /*
1623 * This value represents the total amount of available space. As more space is
1624 * allocated by ESE volumes, this value will decrease.
1625 * The data for this value is therefore updated on any call.
1626 */
dasd_eckd_space_configured(struct dasd_device * device)1627 static int dasd_eckd_space_configured(struct dasd_device *device)
1628 {
1629 struct dasd_eckd_private *private = device->private;
1630 int rc;
1631
1632 rc = dasd_eckd_read_vol_info(device);
1633
1634 return rc ? : private->vsq.space_configured;
1635 }
1636
1637 /*
1638 * The value of space allocated by an ESE volume may have changed and is
1639 * therefore updated on any call.
1640 */
dasd_eckd_space_allocated(struct dasd_device * device)1641 static int dasd_eckd_space_allocated(struct dasd_device *device)
1642 {
1643 struct dasd_eckd_private *private = device->private;
1644 int rc;
1645
1646 rc = dasd_eckd_read_vol_info(device);
1647
1648 return rc ? : private->vsq.space_allocated;
1649 }
1650
dasd_eckd_logical_capacity(struct dasd_device * device)1651 static int dasd_eckd_logical_capacity(struct dasd_device *device)
1652 {
1653 struct dasd_eckd_private *private = device->private;
1654
1655 return private->vsq.logical_capacity;
1656 }
1657
dasd_eckd_ext_pool_exhaust_work(struct work_struct * work)1658 static void dasd_eckd_ext_pool_exhaust_work(struct work_struct *work)
1659 {
1660 struct ext_pool_exhaust_work_data *data;
1661 struct dasd_device *device;
1662 struct dasd_device *base;
1663
1664 data = container_of(work, struct ext_pool_exhaust_work_data, worker);
1665 device = data->device;
1666 base = data->base;
1667
1668 if (!base)
1669 base = device;
1670 if (dasd_eckd_space_configured(base) != 0) {
1671 dasd_generic_space_avail(device);
1672 } else {
1673 dev_warn(&device->cdev->dev, "No space left in the extent pool\n");
1674 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "out of space");
1675 }
1676
1677 dasd_put_device(device);
1678 kfree(data);
1679 }
1680
dasd_eckd_ext_pool_exhaust(struct dasd_device * device,struct dasd_ccw_req * cqr)1681 static int dasd_eckd_ext_pool_exhaust(struct dasd_device *device,
1682 struct dasd_ccw_req *cqr)
1683 {
1684 struct ext_pool_exhaust_work_data *data;
1685
1686 data = kzalloc(sizeof(*data), GFP_ATOMIC);
1687 if (!data)
1688 return -ENOMEM;
1689 INIT_WORK(&data->worker, dasd_eckd_ext_pool_exhaust_work);
1690 dasd_get_device(device);
1691 data->device = device;
1692
1693 if (cqr->block)
1694 data->base = cqr->block->base;
1695 else if (cqr->basedev)
1696 data->base = cqr->basedev;
1697 else
1698 data->base = NULL;
1699
1700 schedule_work(&data->worker);
1701
1702 return 0;
1703 }
1704
dasd_eckd_cpy_ext_pool_data(struct dasd_device * device,struct dasd_rssd_lcq * lcq)1705 static void dasd_eckd_cpy_ext_pool_data(struct dasd_device *device,
1706 struct dasd_rssd_lcq *lcq)
1707 {
1708 struct dasd_eckd_private *private = device->private;
1709 int pool_id = dasd_eckd_ext_pool_id(device);
1710 struct dasd_ext_pool_sum eps;
1711 int i;
1712
1713 for (i = 0; i < lcq->pool_count; i++) {
1714 eps = lcq->ext_pool_sum[i];
1715 if (eps.pool_id == pool_id) {
1716 memcpy(&private->eps, &eps,
1717 sizeof(struct dasd_ext_pool_sum));
1718 }
1719 }
1720 }
1721
1722 /* Read Extent Pool Information - Logical Configuration Query */
dasd_eckd_read_ext_pool_info(struct dasd_device * device)1723 static int dasd_eckd_read_ext_pool_info(struct dasd_device *device)
1724 {
1725 struct dasd_eckd_private *private = device->private;
1726 struct dasd_psf_prssd_data *prssdp;
1727 struct dasd_rssd_lcq *lcq;
1728 struct dasd_ccw_req *cqr;
1729 struct ccw1 *ccw;
1730 int rc;
1731
1732 /* This command cannot be executed on an alias device */
1733 if (private->uid.type == UA_BASE_PAV_ALIAS ||
1734 private->uid.type == UA_HYPER_PAV_ALIAS)
1735 return 0;
1736
1737 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 /* PSF + RSSD */,
1738 sizeof(*prssdp) + sizeof(*lcq), device, NULL);
1739 if (IS_ERR(cqr)) {
1740 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1741 "Could not allocate initialization request");
1742 return PTR_ERR(cqr);
1743 }
1744
1745 /* Prepare for Read Subsystem Data */
1746 prssdp = cqr->data;
1747 memset(prssdp, 0, sizeof(*prssdp));
1748 prssdp->order = PSF_ORDER_PRSSD;
1749 prssdp->suborder = PSF_SUBORDER_LCQ; /* Logical Configuration Query */
1750
1751 ccw = cqr->cpaddr;
1752 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1753 ccw->count = sizeof(*prssdp);
1754 ccw->flags |= CCW_FLAG_CC;
1755 ccw->cda = (__u32)(addr_t)prssdp;
1756
1757 lcq = (struct dasd_rssd_lcq *)(prssdp + 1);
1758 memset(lcq, 0, sizeof(*lcq));
1759
1760 ccw++;
1761 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1762 ccw->count = sizeof(*lcq);
1763 ccw->flags |= CCW_FLAG_SLI;
1764 ccw->cda = (__u32)(addr_t)lcq;
1765
1766 cqr->buildclk = get_tod_clock();
1767 cqr->status = DASD_CQR_FILLED;
1768 cqr->startdev = device;
1769 cqr->memdev = device;
1770 cqr->block = NULL;
1771 cqr->retries = 256;
1772 cqr->expires = device->default_expires * HZ;
1773 /* The command might not be supported. Suppress the error output */
1774 __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
1775
1776 rc = dasd_sleep_on_interruptible(cqr);
1777 if (rc == 0) {
1778 dasd_eckd_cpy_ext_pool_data(device, lcq);
1779 } else {
1780 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1781 "Reading the logical configuration failed with rc=%d", rc);
1782 }
1783
1784 dasd_sfree_request(cqr, cqr->memdev);
1785
1786 return rc;
1787 }
1788
1789 /*
1790 * Depending on the device type, the extent size is specified either as
1791 * cylinders per extent (CKD) or size per extent (FBA)
1792 * A 1GB size corresponds to 1113cyl, and 16MB to 21cyl.
1793 */
dasd_eckd_ext_size(struct dasd_device * device)1794 static int dasd_eckd_ext_size(struct dasd_device *device)
1795 {
1796 struct dasd_eckd_private *private = device->private;
1797 struct dasd_ext_pool_sum eps = private->eps;
1798
1799 if (!eps.flags.extent_size_valid)
1800 return 0;
1801 if (eps.extent_size.size_1G)
1802 return 1113;
1803 if (eps.extent_size.size_16M)
1804 return 21;
1805
1806 return 0;
1807 }
1808
dasd_eckd_ext_pool_warn_thrshld(struct dasd_device * device)1809 static int dasd_eckd_ext_pool_warn_thrshld(struct dasd_device *device)
1810 {
1811 struct dasd_eckd_private *private = device->private;
1812
1813 return private->eps.warn_thrshld;
1814 }
1815
dasd_eckd_ext_pool_cap_at_warnlevel(struct dasd_device * device)1816 static int dasd_eckd_ext_pool_cap_at_warnlevel(struct dasd_device *device)
1817 {
1818 struct dasd_eckd_private *private = device->private;
1819
1820 return private->eps.flags.capacity_at_warnlevel;
1821 }
1822
1823 /*
1824 * Extent Pool out of space
1825 */
dasd_eckd_ext_pool_oos(struct dasd_device * device)1826 static int dasd_eckd_ext_pool_oos(struct dasd_device *device)
1827 {
1828 struct dasd_eckd_private *private = device->private;
1829
1830 return private->eps.flags.pool_oos;
1831 }
1832
1833 /*
1834 * Build CP for Perform Subsystem Function - SSC.
1835 */
dasd_eckd_build_psf_ssc(struct dasd_device * device,int enable_pav)1836 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1837 int enable_pav)
1838 {
1839 struct dasd_ccw_req *cqr;
1840 struct dasd_psf_ssc_data *psf_ssc_data;
1841 struct ccw1 *ccw;
1842
1843 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1844 sizeof(struct dasd_psf_ssc_data),
1845 device, NULL);
1846
1847 if (IS_ERR(cqr)) {
1848 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1849 "Could not allocate PSF-SSC request");
1850 return cqr;
1851 }
1852 psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1853 psf_ssc_data->order = PSF_ORDER_SSC;
1854 psf_ssc_data->suborder = 0xc0;
1855 if (enable_pav) {
1856 psf_ssc_data->suborder |= 0x08;
1857 psf_ssc_data->reserved[0] = 0x88;
1858 }
1859 ccw = cqr->cpaddr;
1860 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1861 ccw->cda = (__u32)(addr_t)psf_ssc_data;
1862 ccw->count = 66;
1863
1864 cqr->startdev = device;
1865 cqr->memdev = device;
1866 cqr->block = NULL;
1867 cqr->retries = 256;
1868 cqr->expires = 10*HZ;
1869 cqr->buildclk = get_tod_clock();
1870 cqr->status = DASD_CQR_FILLED;
1871 return cqr;
1872 }
1873
1874 /*
1875 * Perform Subsystem Function.
1876 * It is necessary to trigger CIO for channel revalidation since this
1877 * call might change behaviour of DASD devices.
1878 */
1879 static int
dasd_eckd_psf_ssc(struct dasd_device * device,int enable_pav,unsigned long flags)1880 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1881 unsigned long flags)
1882 {
1883 struct dasd_ccw_req *cqr;
1884 int rc;
1885
1886 cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1887 if (IS_ERR(cqr))
1888 return PTR_ERR(cqr);
1889
1890 /*
1891 * set flags e.g. turn on failfast, to prevent blocking
1892 * the calling function should handle failed requests
1893 */
1894 cqr->flags |= flags;
1895
1896 rc = dasd_sleep_on(cqr);
1897 if (!rc)
1898 /* trigger CIO to reprobe devices */
1899 css_schedule_reprobe();
1900 else if (cqr->intrc == -EAGAIN)
1901 rc = -EAGAIN;
1902
1903 dasd_sfree_request(cqr, cqr->memdev);
1904 return rc;
1905 }
1906
1907 /*
1908 * Valide storage server of current device.
1909 */
dasd_eckd_validate_server(struct dasd_device * device,unsigned long flags)1910 static int dasd_eckd_validate_server(struct dasd_device *device,
1911 unsigned long flags)
1912 {
1913 struct dasd_eckd_private *private = device->private;
1914 int enable_pav, rc;
1915
1916 if (private->uid.type == UA_BASE_PAV_ALIAS ||
1917 private->uid.type == UA_HYPER_PAV_ALIAS)
1918 return 0;
1919 if (dasd_nopav || MACHINE_IS_VM)
1920 enable_pav = 0;
1921 else
1922 enable_pav = 1;
1923 rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1924
1925 /* may be requested feature is not available on server,
1926 * therefore just report error and go ahead */
1927 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1928 "returned rc=%d", private->uid.ssid, rc);
1929 return rc;
1930 }
1931
1932 /*
1933 * worker to do a validate server in case of a lost pathgroup
1934 */
dasd_eckd_do_validate_server(struct work_struct * work)1935 static void dasd_eckd_do_validate_server(struct work_struct *work)
1936 {
1937 struct dasd_device *device = container_of(work, struct dasd_device,
1938 kick_validate);
1939 unsigned long flags = 0;
1940
1941 set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1942 if (dasd_eckd_validate_server(device, flags)
1943 == -EAGAIN) {
1944 /* schedule worker again if failed */
1945 schedule_work(&device->kick_validate);
1946 return;
1947 }
1948
1949 dasd_put_device(device);
1950 }
1951
dasd_eckd_kick_validate_server(struct dasd_device * device)1952 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1953 {
1954 dasd_get_device(device);
1955 /* exit if device not online or in offline processing */
1956 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1957 device->state < DASD_STATE_ONLINE) {
1958 dasd_put_device(device);
1959 return;
1960 }
1961 /* queue call to do_validate_server to the kernel event daemon. */
1962 if (!schedule_work(&device->kick_validate))
1963 dasd_put_device(device);
1964 }
1965
1966 /*
1967 * Check device characteristics.
1968 * If the device is accessible using ECKD discipline, the device is enabled.
1969 */
1970 static int
dasd_eckd_check_characteristics(struct dasd_device * device)1971 dasd_eckd_check_characteristics(struct dasd_device *device)
1972 {
1973 struct dasd_eckd_private *private = device->private;
1974 struct dasd_block *block;
1975 struct dasd_uid temp_uid;
1976 int rc, i;
1977 int readonly;
1978 unsigned long value;
1979
1980 /* setup work queue for validate server*/
1981 INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1982 /* setup work queue for summary unit check */
1983 INIT_WORK(&device->suc_work, dasd_alias_handle_summary_unit_check);
1984
1985 if (!ccw_device_is_pathgroup(device->cdev)) {
1986 dev_warn(&device->cdev->dev,
1987 "A channel path group could not be established\n");
1988 return -EIO;
1989 }
1990 if (!ccw_device_is_multipath(device->cdev)) {
1991 dev_info(&device->cdev->dev,
1992 "The DASD is not operating in multipath mode\n");
1993 }
1994 if (!private) {
1995 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1996 if (!private) {
1997 dev_warn(&device->cdev->dev,
1998 "Allocating memory for private DASD data "
1999 "failed\n");
2000 return -ENOMEM;
2001 }
2002 device->private = private;
2003 } else {
2004 memset(private, 0, sizeof(*private));
2005 }
2006 /* Invalidate status of initial analysis. */
2007 private->init_cqr_status = -1;
2008 /* Set default cache operations. */
2009 private->attrib.operation = DASD_NORMAL_CACHE;
2010 private->attrib.nr_cyl = 0;
2011
2012 /* Read Configuration Data */
2013 rc = dasd_eckd_read_conf(device);
2014 if (rc)
2015 goto out_err1;
2016
2017 /* set some default values */
2018 device->default_expires = DASD_EXPIRES;
2019 device->default_retries = DASD_RETRIES;
2020 device->path_thrhld = DASD_ECKD_PATH_THRHLD;
2021 device->path_interval = DASD_ECKD_PATH_INTERVAL;
2022
2023 if (private->gneq) {
2024 value = 1;
2025 for (i = 0; i < private->gneq->timeout.value; i++)
2026 value = 10 * value;
2027 value = value * private->gneq->timeout.number;
2028 /* do not accept useless values */
2029 if (value != 0 && value <= DASD_EXPIRES_MAX)
2030 device->default_expires = value;
2031 }
2032
2033 dasd_eckd_get_uid(device, &temp_uid);
2034 if (temp_uid.type == UA_BASE_DEVICE) {
2035 block = dasd_alloc_block();
2036 if (IS_ERR(block)) {
2037 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
2038 "could not allocate dasd "
2039 "block structure");
2040 rc = PTR_ERR(block);
2041 goto out_err1;
2042 }
2043 device->block = block;
2044 block->base = device;
2045 }
2046
2047 /* register lcu with alias handling, enable PAV */
2048 rc = dasd_alias_make_device_known_to_lcu(device);
2049 if (rc)
2050 goto out_err2;
2051
2052 dasd_eckd_validate_server(device, 0);
2053
2054 /* device may report different configuration data after LCU setup */
2055 rc = dasd_eckd_read_conf(device);
2056 if (rc)
2057 goto out_err3;
2058
2059 /* Read Feature Codes */
2060 dasd_eckd_read_features(device);
2061
2062 /* Read Volume Information */
2063 dasd_eckd_read_vol_info(device);
2064
2065 /* Read Extent Pool Information */
2066 dasd_eckd_read_ext_pool_info(device);
2067
2068 /* Read Device Characteristics */
2069 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
2070 &private->rdc_data, 64);
2071 if (rc) {
2072 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
2073 "Read device characteristic failed, rc=%d", rc);
2074 goto out_err3;
2075 }
2076
2077 if ((device->features & DASD_FEATURE_USERAW) &&
2078 !(private->rdc_data.facilities.RT_in_LR)) {
2079 dev_err(&device->cdev->dev, "The storage server does not "
2080 "support raw-track access\n");
2081 rc = -EINVAL;
2082 goto out_err3;
2083 }
2084
2085 /* find the valid cylinder size */
2086 if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
2087 private->rdc_data.long_no_cyl)
2088 private->real_cyl = private->rdc_data.long_no_cyl;
2089 else
2090 private->real_cyl = private->rdc_data.no_cyl;
2091
2092 private->fcx_max_data = get_fcx_max_data(device);
2093
2094 readonly = dasd_device_is_ro(device);
2095 if (readonly)
2096 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
2097
2098 dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
2099 "with %d cylinders, %d heads, %d sectors%s\n",
2100 private->rdc_data.dev_type,
2101 private->rdc_data.dev_model,
2102 private->rdc_data.cu_type,
2103 private->rdc_data.cu_model.model,
2104 private->real_cyl,
2105 private->rdc_data.trk_per_cyl,
2106 private->rdc_data.sec_per_trk,
2107 readonly ? ", read-only device" : "");
2108 return 0;
2109
2110 out_err3:
2111 dasd_alias_disconnect_device_from_lcu(device);
2112 out_err2:
2113 dasd_free_block(device->block);
2114 device->block = NULL;
2115 out_err1:
2116 dasd_eckd_clear_conf_data(device);
2117 kfree(device->private);
2118 device->private = NULL;
2119 return rc;
2120 }
2121
dasd_eckd_uncheck_device(struct dasd_device * device)2122 static void dasd_eckd_uncheck_device(struct dasd_device *device)
2123 {
2124 struct dasd_eckd_private *private = device->private;
2125
2126 if (!private)
2127 return;
2128
2129 dasd_alias_disconnect_device_from_lcu(device);
2130 private->ned = NULL;
2131 private->sneq = NULL;
2132 private->vdsneq = NULL;
2133 private->gneq = NULL;
2134 dasd_eckd_clear_conf_data(device);
2135 }
2136
2137 static struct dasd_ccw_req *
dasd_eckd_analysis_ccw(struct dasd_device * device)2138 dasd_eckd_analysis_ccw(struct dasd_device *device)
2139 {
2140 struct dasd_eckd_private *private = device->private;
2141 struct eckd_count *count_data;
2142 struct LO_eckd_data *LO_data;
2143 struct dasd_ccw_req *cqr;
2144 struct ccw1 *ccw;
2145 int cplength, datasize;
2146 int i;
2147
2148 cplength = 8;
2149 datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
2150 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device,
2151 NULL);
2152 if (IS_ERR(cqr))
2153 return cqr;
2154 ccw = cqr->cpaddr;
2155 /* Define extent for the first 2 tracks. */
2156 define_extent(ccw++, cqr->data, 0, 1,
2157 DASD_ECKD_CCW_READ_COUNT, device, 0);
2158 LO_data = cqr->data + sizeof(struct DE_eckd_data);
2159 /* Locate record for the first 4 records on track 0. */
2160 ccw[-1].flags |= CCW_FLAG_CC;
2161 locate_record(ccw++, LO_data++, 0, 0, 4,
2162 DASD_ECKD_CCW_READ_COUNT, device, 0);
2163
2164 count_data = private->count_area;
2165 for (i = 0; i < 4; i++) {
2166 ccw[-1].flags |= CCW_FLAG_CC;
2167 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2168 ccw->flags = 0;
2169 ccw->count = 8;
2170 ccw->cda = (__u32)(addr_t) count_data;
2171 ccw++;
2172 count_data++;
2173 }
2174
2175 /* Locate record for the first record on track 1. */
2176 ccw[-1].flags |= CCW_FLAG_CC;
2177 locate_record(ccw++, LO_data++, 1, 0, 1,
2178 DASD_ECKD_CCW_READ_COUNT, device, 0);
2179 /* Read count ccw. */
2180 ccw[-1].flags |= CCW_FLAG_CC;
2181 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2182 ccw->flags = 0;
2183 ccw->count = 8;
2184 ccw->cda = (__u32)(addr_t) count_data;
2185
2186 cqr->block = NULL;
2187 cqr->startdev = device;
2188 cqr->memdev = device;
2189 cqr->retries = 255;
2190 cqr->buildclk = get_tod_clock();
2191 cqr->status = DASD_CQR_FILLED;
2192 /* Set flags to suppress output for expected errors */
2193 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2194
2195 return cqr;
2196 }
2197
2198 /* differentiate between 'no record found' and any other error */
dasd_eckd_analysis_evaluation(struct dasd_ccw_req * init_cqr)2199 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
2200 {
2201 char *sense;
2202 if (init_cqr->status == DASD_CQR_DONE)
2203 return INIT_CQR_OK;
2204 else if (init_cqr->status == DASD_CQR_NEED_ERP ||
2205 init_cqr->status == DASD_CQR_FAILED) {
2206 sense = dasd_get_sense(&init_cqr->irb);
2207 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
2208 return INIT_CQR_UNFORMATTED;
2209 else
2210 return INIT_CQR_ERROR;
2211 } else
2212 return INIT_CQR_ERROR;
2213 }
2214
2215 /*
2216 * This is the callback function for the init_analysis cqr. It saves
2217 * the status of the initial analysis ccw before it frees it and kicks
2218 * the device to continue the startup sequence. This will call
2219 * dasd_eckd_do_analysis again (if the devices has not been marked
2220 * for deletion in the meantime).
2221 */
dasd_eckd_analysis_callback(struct dasd_ccw_req * init_cqr,void * data)2222 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
2223 void *data)
2224 {
2225 struct dasd_device *device = init_cqr->startdev;
2226 struct dasd_eckd_private *private = device->private;
2227
2228 private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
2229 dasd_sfree_request(init_cqr, device);
2230 dasd_kick_device(device);
2231 }
2232
dasd_eckd_start_analysis(struct dasd_block * block)2233 static int dasd_eckd_start_analysis(struct dasd_block *block)
2234 {
2235 struct dasd_ccw_req *init_cqr;
2236
2237 init_cqr = dasd_eckd_analysis_ccw(block->base);
2238 if (IS_ERR(init_cqr))
2239 return PTR_ERR(init_cqr);
2240 init_cqr->callback = dasd_eckd_analysis_callback;
2241 init_cqr->callback_data = NULL;
2242 init_cqr->expires = 5*HZ;
2243 /* first try without ERP, so we can later handle unformatted
2244 * devices as special case
2245 */
2246 clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
2247 init_cqr->retries = 0;
2248 dasd_add_request_head(init_cqr);
2249 return -EAGAIN;
2250 }
2251
dasd_eckd_end_analysis(struct dasd_block * block)2252 static int dasd_eckd_end_analysis(struct dasd_block *block)
2253 {
2254 struct dasd_device *device = block->base;
2255 struct dasd_eckd_private *private = device->private;
2256 struct eckd_count *count_area;
2257 unsigned int sb, blk_per_trk;
2258 int status, i;
2259 struct dasd_ccw_req *init_cqr;
2260
2261 status = private->init_cqr_status;
2262 private->init_cqr_status = -1;
2263 if (status == INIT_CQR_ERROR) {
2264 /* try again, this time with full ERP */
2265 init_cqr = dasd_eckd_analysis_ccw(device);
2266 dasd_sleep_on(init_cqr);
2267 status = dasd_eckd_analysis_evaluation(init_cqr);
2268 dasd_sfree_request(init_cqr, device);
2269 }
2270
2271 if (device->features & DASD_FEATURE_USERAW) {
2272 block->bp_block = DASD_RAW_BLOCKSIZE;
2273 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
2274 block->s2b_shift = 3;
2275 goto raw;
2276 }
2277
2278 if (status == INIT_CQR_UNFORMATTED) {
2279 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
2280 return -EMEDIUMTYPE;
2281 } else if (status == INIT_CQR_ERROR) {
2282 dev_err(&device->cdev->dev,
2283 "Detecting the DASD disk layout failed because "
2284 "of an I/O error\n");
2285 return -EIO;
2286 }
2287
2288 private->uses_cdl = 1;
2289 /* Check Track 0 for Compatible Disk Layout */
2290 count_area = NULL;
2291 for (i = 0; i < 3; i++) {
2292 if (private->count_area[i].kl != 4 ||
2293 private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
2294 private->count_area[i].cyl != 0 ||
2295 private->count_area[i].head != count_area_head[i] ||
2296 private->count_area[i].record != count_area_rec[i]) {
2297 private->uses_cdl = 0;
2298 break;
2299 }
2300 }
2301 if (i == 3)
2302 count_area = &private->count_area[3];
2303
2304 if (private->uses_cdl == 0) {
2305 for (i = 0; i < 5; i++) {
2306 if ((private->count_area[i].kl != 0) ||
2307 (private->count_area[i].dl !=
2308 private->count_area[0].dl) ||
2309 private->count_area[i].cyl != 0 ||
2310 private->count_area[i].head != count_area_head[i] ||
2311 private->count_area[i].record != count_area_rec[i])
2312 break;
2313 }
2314 if (i == 5)
2315 count_area = &private->count_area[0];
2316 } else {
2317 if (private->count_area[3].record == 1)
2318 dev_warn(&device->cdev->dev,
2319 "Track 0 has no records following the VTOC\n");
2320 }
2321
2322 if (count_area != NULL && count_area->kl == 0) {
2323 /* we found notthing violating our disk layout */
2324 if (dasd_check_blocksize(count_area->dl) == 0)
2325 block->bp_block = count_area->dl;
2326 }
2327 if (block->bp_block == 0) {
2328 dev_warn(&device->cdev->dev,
2329 "The disk layout of the DASD is not supported\n");
2330 return -EMEDIUMTYPE;
2331 }
2332 block->s2b_shift = 0; /* bits to shift 512 to get a block */
2333 for (sb = 512; sb < block->bp_block; sb = sb << 1)
2334 block->s2b_shift++;
2335
2336 blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2337
2338 raw:
2339 block->blocks = ((unsigned long) private->real_cyl *
2340 private->rdc_data.trk_per_cyl *
2341 blk_per_trk);
2342
2343 dev_info(&device->cdev->dev,
2344 "DASD with %u KB/block, %lu KB total size, %u KB/track, "
2345 "%s\n", (block->bp_block >> 10),
2346 (((unsigned long) private->real_cyl *
2347 private->rdc_data.trk_per_cyl *
2348 blk_per_trk * (block->bp_block >> 9)) >> 1),
2349 ((blk_per_trk * block->bp_block) >> 10),
2350 private->uses_cdl ?
2351 "compatible disk layout" : "linux disk layout");
2352
2353 return 0;
2354 }
2355
dasd_eckd_do_analysis(struct dasd_block * block)2356 static int dasd_eckd_do_analysis(struct dasd_block *block)
2357 {
2358 struct dasd_eckd_private *private = block->base->private;
2359
2360 if (private->init_cqr_status < 0)
2361 return dasd_eckd_start_analysis(block);
2362 else
2363 return dasd_eckd_end_analysis(block);
2364 }
2365
dasd_eckd_basic_to_ready(struct dasd_device * device)2366 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2367 {
2368 return dasd_alias_add_device(device);
2369 };
2370
dasd_eckd_online_to_ready(struct dasd_device * device)2371 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2372 {
2373 if (cancel_work_sync(&device->reload_device))
2374 dasd_put_device(device);
2375 if (cancel_work_sync(&device->kick_validate))
2376 dasd_put_device(device);
2377
2378 return 0;
2379 };
2380
dasd_eckd_basic_to_known(struct dasd_device * device)2381 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2382 {
2383 return dasd_alias_remove_device(device);
2384 };
2385
2386 static int
dasd_eckd_fill_geometry(struct dasd_block * block,struct hd_geometry * geo)2387 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2388 {
2389 struct dasd_eckd_private *private = block->base->private;
2390
2391 if (dasd_check_blocksize(block->bp_block) == 0) {
2392 geo->sectors = recs_per_track(&private->rdc_data,
2393 0, block->bp_block);
2394 }
2395 geo->cylinders = private->rdc_data.no_cyl;
2396 geo->heads = private->rdc_data.trk_per_cyl;
2397 return 0;
2398 }
2399
2400 /*
2401 * Build the TCW request for the format check
2402 */
2403 static struct dasd_ccw_req *
dasd_eckd_build_check_tcw(struct dasd_device * base,struct format_data_t * fdata,int enable_pav,struct eckd_count * fmt_buffer,int rpt)2404 dasd_eckd_build_check_tcw(struct dasd_device *base, struct format_data_t *fdata,
2405 int enable_pav, struct eckd_count *fmt_buffer,
2406 int rpt)
2407 {
2408 struct dasd_eckd_private *start_priv;
2409 struct dasd_device *startdev = NULL;
2410 struct tidaw *last_tidaw = NULL;
2411 struct dasd_ccw_req *cqr;
2412 struct itcw *itcw;
2413 int itcw_size;
2414 int count;
2415 int rc;
2416 int i;
2417
2418 if (enable_pav)
2419 startdev = dasd_alias_get_start_dev(base);
2420
2421 if (!startdev)
2422 startdev = base;
2423
2424 start_priv = startdev->private;
2425
2426 count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2427
2428 /*
2429 * we're adding 'count' amount of tidaw to the itcw.
2430 * calculate the corresponding itcw_size
2431 */
2432 itcw_size = itcw_calc_size(0, count, 0);
2433
2434 cqr = dasd_fmalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2435 if (IS_ERR(cqr))
2436 return cqr;
2437
2438 start_priv->count++;
2439
2440 itcw = itcw_init(cqr->data, itcw_size, ITCW_OP_READ, 0, count, 0);
2441 if (IS_ERR(itcw)) {
2442 rc = -EINVAL;
2443 goto out_err;
2444 }
2445
2446 cqr->cpaddr = itcw_get_tcw(itcw);
2447 rc = prepare_itcw(itcw, fdata->start_unit, fdata->stop_unit,
2448 DASD_ECKD_CCW_READ_COUNT_MT, base, startdev, 0, count,
2449 sizeof(struct eckd_count),
2450 count * sizeof(struct eckd_count), 0, rpt);
2451 if (rc)
2452 goto out_err;
2453
2454 for (i = 0; i < count; i++) {
2455 last_tidaw = itcw_add_tidaw(itcw, 0, fmt_buffer++,
2456 sizeof(struct eckd_count));
2457 if (IS_ERR(last_tidaw)) {
2458 rc = -EINVAL;
2459 goto out_err;
2460 }
2461 }
2462
2463 last_tidaw->flags |= TIDAW_FLAGS_LAST;
2464 itcw_finalize(itcw);
2465
2466 cqr->cpmode = 1;
2467 cqr->startdev = startdev;
2468 cqr->memdev = startdev;
2469 cqr->basedev = base;
2470 cqr->retries = startdev->default_retries;
2471 cqr->expires = startdev->default_expires * HZ;
2472 cqr->buildclk = get_tod_clock();
2473 cqr->status = DASD_CQR_FILLED;
2474 /* Set flags to suppress output for expected errors */
2475 set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
2476 set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
2477
2478 return cqr;
2479
2480 out_err:
2481 dasd_sfree_request(cqr, startdev);
2482
2483 return ERR_PTR(rc);
2484 }
2485
2486 /*
2487 * Build the CCW request for the format check
2488 */
2489 static struct dasd_ccw_req *
dasd_eckd_build_check(struct dasd_device * base,struct format_data_t * fdata,int enable_pav,struct eckd_count * fmt_buffer,int rpt)2490 dasd_eckd_build_check(struct dasd_device *base, struct format_data_t *fdata,
2491 int enable_pav, struct eckd_count *fmt_buffer, int rpt)
2492 {
2493 struct dasd_eckd_private *start_priv;
2494 struct dasd_eckd_private *base_priv;
2495 struct dasd_device *startdev = NULL;
2496 struct dasd_ccw_req *cqr;
2497 struct ccw1 *ccw;
2498 void *data;
2499 int cplength, datasize;
2500 int use_prefix;
2501 int count;
2502 int i;
2503
2504 if (enable_pav)
2505 startdev = dasd_alias_get_start_dev(base);
2506
2507 if (!startdev)
2508 startdev = base;
2509
2510 start_priv = startdev->private;
2511 base_priv = base->private;
2512
2513 count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2514
2515 use_prefix = base_priv->features.feature[8] & 0x01;
2516
2517 if (use_prefix) {
2518 cplength = 1;
2519 datasize = sizeof(struct PFX_eckd_data);
2520 } else {
2521 cplength = 2;
2522 datasize = sizeof(struct DE_eckd_data) +
2523 sizeof(struct LO_eckd_data);
2524 }
2525 cplength += count;
2526
2527 cqr = dasd_fmalloc_request(DASD_ECKD_MAGIC, cplength, datasize, startdev);
2528 if (IS_ERR(cqr))
2529 return cqr;
2530
2531 start_priv->count++;
2532 data = cqr->data;
2533 ccw = cqr->cpaddr;
2534
2535 if (use_prefix) {
2536 prefix_LRE(ccw++, data, fdata->start_unit, fdata->stop_unit,
2537 DASD_ECKD_CCW_READ_COUNT, base, startdev, 1, 0,
2538 count, 0, 0);
2539 } else {
2540 define_extent(ccw++, data, fdata->start_unit, fdata->stop_unit,
2541 DASD_ECKD_CCW_READ_COUNT, startdev, 0);
2542
2543 data += sizeof(struct DE_eckd_data);
2544 ccw[-1].flags |= CCW_FLAG_CC;
2545
2546 locate_record(ccw++, data, fdata->start_unit, 0, count,
2547 DASD_ECKD_CCW_READ_COUNT, base, 0);
2548 }
2549
2550 for (i = 0; i < count; i++) {
2551 ccw[-1].flags |= CCW_FLAG_CC;
2552 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2553 ccw->flags = CCW_FLAG_SLI;
2554 ccw->count = 8;
2555 ccw->cda = (__u32)(addr_t) fmt_buffer;
2556 ccw++;
2557 fmt_buffer++;
2558 }
2559
2560 cqr->startdev = startdev;
2561 cqr->memdev = startdev;
2562 cqr->basedev = base;
2563 cqr->retries = DASD_RETRIES;
2564 cqr->expires = startdev->default_expires * HZ;
2565 cqr->buildclk = get_tod_clock();
2566 cqr->status = DASD_CQR_FILLED;
2567 /* Set flags to suppress output for expected errors */
2568 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2569
2570 return cqr;
2571 }
2572
2573 static struct dasd_ccw_req *
dasd_eckd_build_format(struct dasd_device * base,struct dasd_device * startdev,struct format_data_t * fdata,int enable_pav)2574 dasd_eckd_build_format(struct dasd_device *base, struct dasd_device *startdev,
2575 struct format_data_t *fdata, int enable_pav)
2576 {
2577 struct dasd_eckd_private *base_priv;
2578 struct dasd_eckd_private *start_priv;
2579 struct dasd_ccw_req *fcp;
2580 struct eckd_count *ect;
2581 struct ch_t address;
2582 struct ccw1 *ccw;
2583 void *data;
2584 int rpt;
2585 int cplength, datasize;
2586 int i, j;
2587 int intensity = 0;
2588 int r0_perm;
2589 int nr_tracks;
2590 int use_prefix;
2591
2592 if (enable_pav)
2593 startdev = dasd_alias_get_start_dev(base);
2594
2595 if (!startdev)
2596 startdev = base;
2597
2598 start_priv = startdev->private;
2599 base_priv = base->private;
2600
2601 rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2602
2603 nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2604
2605 /*
2606 * fdata->intensity is a bit string that tells us what to do:
2607 * Bit 0: write record zero
2608 * Bit 1: write home address, currently not supported
2609 * Bit 2: invalidate tracks
2610 * Bit 3: use OS/390 compatible disk layout (cdl)
2611 * Bit 4: do not allow storage subsystem to modify record zero
2612 * Only some bit combinations do make sense.
2613 */
2614 if (fdata->intensity & 0x10) {
2615 r0_perm = 0;
2616 intensity = fdata->intensity & ~0x10;
2617 } else {
2618 r0_perm = 1;
2619 intensity = fdata->intensity;
2620 }
2621
2622 use_prefix = base_priv->features.feature[8] & 0x01;
2623
2624 switch (intensity) {
2625 case 0x00: /* Normal format */
2626 case 0x08: /* Normal format, use cdl. */
2627 cplength = 2 + (rpt*nr_tracks);
2628 if (use_prefix)
2629 datasize = sizeof(struct PFX_eckd_data) +
2630 sizeof(struct LO_eckd_data) +
2631 rpt * nr_tracks * sizeof(struct eckd_count);
2632 else
2633 datasize = sizeof(struct DE_eckd_data) +
2634 sizeof(struct LO_eckd_data) +
2635 rpt * nr_tracks * sizeof(struct eckd_count);
2636 break;
2637 case 0x01: /* Write record zero and format track. */
2638 case 0x09: /* Write record zero and format track, use cdl. */
2639 cplength = 2 + rpt * nr_tracks;
2640 if (use_prefix)
2641 datasize = sizeof(struct PFX_eckd_data) +
2642 sizeof(struct LO_eckd_data) +
2643 sizeof(struct eckd_count) +
2644 rpt * nr_tracks * sizeof(struct eckd_count);
2645 else
2646 datasize = sizeof(struct DE_eckd_data) +
2647 sizeof(struct LO_eckd_data) +
2648 sizeof(struct eckd_count) +
2649 rpt * nr_tracks * sizeof(struct eckd_count);
2650 break;
2651 case 0x04: /* Invalidate track. */
2652 case 0x0c: /* Invalidate track, use cdl. */
2653 cplength = 3;
2654 if (use_prefix)
2655 datasize = sizeof(struct PFX_eckd_data) +
2656 sizeof(struct LO_eckd_data) +
2657 sizeof(struct eckd_count);
2658 else
2659 datasize = sizeof(struct DE_eckd_data) +
2660 sizeof(struct LO_eckd_data) +
2661 sizeof(struct eckd_count);
2662 break;
2663 default:
2664 dev_warn(&startdev->cdev->dev,
2665 "An I/O control call used incorrect flags 0x%x\n",
2666 fdata->intensity);
2667 return ERR_PTR(-EINVAL);
2668 }
2669
2670 fcp = dasd_fmalloc_request(DASD_ECKD_MAGIC, cplength, datasize, startdev);
2671 if (IS_ERR(fcp))
2672 return fcp;
2673
2674 start_priv->count++;
2675 data = fcp->data;
2676 ccw = fcp->cpaddr;
2677
2678 switch (intensity & ~0x08) {
2679 case 0x00: /* Normal format. */
2680 if (use_prefix) {
2681 prefix(ccw++, (struct PFX_eckd_data *) data,
2682 fdata->start_unit, fdata->stop_unit,
2683 DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2684 /* grant subsystem permission to format R0 */
2685 if (r0_perm)
2686 ((struct PFX_eckd_data *)data)
2687 ->define_extent.ga_extended |= 0x04;
2688 data += sizeof(struct PFX_eckd_data);
2689 } else {
2690 define_extent(ccw++, (struct DE_eckd_data *) data,
2691 fdata->start_unit, fdata->stop_unit,
2692 DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2693 /* grant subsystem permission to format R0 */
2694 if (r0_perm)
2695 ((struct DE_eckd_data *) data)
2696 ->ga_extended |= 0x04;
2697 data += sizeof(struct DE_eckd_data);
2698 }
2699 ccw[-1].flags |= CCW_FLAG_CC;
2700 locate_record(ccw++, (struct LO_eckd_data *) data,
2701 fdata->start_unit, 0, rpt*nr_tracks,
2702 DASD_ECKD_CCW_WRITE_CKD, base,
2703 fdata->blksize);
2704 data += sizeof(struct LO_eckd_data);
2705 break;
2706 case 0x01: /* Write record zero + format track. */
2707 if (use_prefix) {
2708 prefix(ccw++, (struct PFX_eckd_data *) data,
2709 fdata->start_unit, fdata->stop_unit,
2710 DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2711 base, startdev);
2712 data += sizeof(struct PFX_eckd_data);
2713 } else {
2714 define_extent(ccw++, (struct DE_eckd_data *) data,
2715 fdata->start_unit, fdata->stop_unit,
2716 DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev, 0);
2717 data += sizeof(struct DE_eckd_data);
2718 }
2719 ccw[-1].flags |= CCW_FLAG_CC;
2720 locate_record(ccw++, (struct LO_eckd_data *) data,
2721 fdata->start_unit, 0, rpt * nr_tracks + 1,
2722 DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2723 base->block->bp_block);
2724 data += sizeof(struct LO_eckd_data);
2725 break;
2726 case 0x04: /* Invalidate track. */
2727 if (use_prefix) {
2728 prefix(ccw++, (struct PFX_eckd_data *) data,
2729 fdata->start_unit, fdata->stop_unit,
2730 DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2731 data += sizeof(struct PFX_eckd_data);
2732 } else {
2733 define_extent(ccw++, (struct DE_eckd_data *) data,
2734 fdata->start_unit, fdata->stop_unit,
2735 DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2736 data += sizeof(struct DE_eckd_data);
2737 }
2738 ccw[-1].flags |= CCW_FLAG_CC;
2739 locate_record(ccw++, (struct LO_eckd_data *) data,
2740 fdata->start_unit, 0, 1,
2741 DASD_ECKD_CCW_WRITE_CKD, base, 8);
2742 data += sizeof(struct LO_eckd_data);
2743 break;
2744 }
2745
2746 for (j = 0; j < nr_tracks; j++) {
2747 /* calculate cylinder and head for the current track */
2748 set_ch_t(&address,
2749 (fdata->start_unit + j) /
2750 base_priv->rdc_data.trk_per_cyl,
2751 (fdata->start_unit + j) %
2752 base_priv->rdc_data.trk_per_cyl);
2753 if (intensity & 0x01) { /* write record zero */
2754 ect = (struct eckd_count *) data;
2755 data += sizeof(struct eckd_count);
2756 ect->cyl = address.cyl;
2757 ect->head = address.head;
2758 ect->record = 0;
2759 ect->kl = 0;
2760 ect->dl = 8;
2761 ccw[-1].flags |= CCW_FLAG_CC;
2762 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2763 ccw->flags = CCW_FLAG_SLI;
2764 ccw->count = 8;
2765 ccw->cda = (__u32)(addr_t) ect;
2766 ccw++;
2767 }
2768 if ((intensity & ~0x08) & 0x04) { /* erase track */
2769 ect = (struct eckd_count *) data;
2770 data += sizeof(struct eckd_count);
2771 ect->cyl = address.cyl;
2772 ect->head = address.head;
2773 ect->record = 1;
2774 ect->kl = 0;
2775 ect->dl = 0;
2776 ccw[-1].flags |= CCW_FLAG_CC;
2777 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2778 ccw->flags = CCW_FLAG_SLI;
2779 ccw->count = 8;
2780 ccw->cda = (__u32)(addr_t) ect;
2781 } else { /* write remaining records */
2782 for (i = 0; i < rpt; i++) {
2783 ect = (struct eckd_count *) data;
2784 data += sizeof(struct eckd_count);
2785 ect->cyl = address.cyl;
2786 ect->head = address.head;
2787 ect->record = i + 1;
2788 ect->kl = 0;
2789 ect->dl = fdata->blksize;
2790 /*
2791 * Check for special tracks 0-1
2792 * when formatting CDL
2793 */
2794 if ((intensity & 0x08) &&
2795 address.cyl == 0 && address.head == 0) {
2796 if (i < 3) {
2797 ect->kl = 4;
2798 ect->dl = sizes_trk0[i] - 4;
2799 }
2800 }
2801 if ((intensity & 0x08) &&
2802 address.cyl == 0 && address.head == 1) {
2803 ect->kl = 44;
2804 ect->dl = LABEL_SIZE - 44;
2805 }
2806 ccw[-1].flags |= CCW_FLAG_CC;
2807 if (i != 0 || j == 0)
2808 ccw->cmd_code =
2809 DASD_ECKD_CCW_WRITE_CKD;
2810 else
2811 ccw->cmd_code =
2812 DASD_ECKD_CCW_WRITE_CKD_MT;
2813 ccw->flags = CCW_FLAG_SLI;
2814 ccw->count = 8;
2815 ccw->cda = (__u32)(addr_t) ect;
2816 ccw++;
2817 }
2818 }
2819 }
2820
2821 fcp->startdev = startdev;
2822 fcp->memdev = startdev;
2823 fcp->basedev = base;
2824 fcp->retries = 256;
2825 fcp->expires = startdev->default_expires * HZ;
2826 fcp->buildclk = get_tod_clock();
2827 fcp->status = DASD_CQR_FILLED;
2828
2829 return fcp;
2830 }
2831
2832 /*
2833 * Wrapper function to build a CCW request depending on input data
2834 */
2835 static struct dasd_ccw_req *
dasd_eckd_format_build_ccw_req(struct dasd_device * base,struct format_data_t * fdata,int enable_pav,int tpm,struct eckd_count * fmt_buffer,int rpt)2836 dasd_eckd_format_build_ccw_req(struct dasd_device *base,
2837 struct format_data_t *fdata, int enable_pav,
2838 int tpm, struct eckd_count *fmt_buffer, int rpt)
2839 {
2840 struct dasd_ccw_req *ccw_req;
2841
2842 if (!fmt_buffer) {
2843 ccw_req = dasd_eckd_build_format(base, NULL, fdata, enable_pav);
2844 } else {
2845 if (tpm)
2846 ccw_req = dasd_eckd_build_check_tcw(base, fdata,
2847 enable_pav,
2848 fmt_buffer, rpt);
2849 else
2850 ccw_req = dasd_eckd_build_check(base, fdata, enable_pav,
2851 fmt_buffer, rpt);
2852 }
2853
2854 return ccw_req;
2855 }
2856
2857 /*
2858 * Sanity checks on format_data
2859 */
dasd_eckd_format_sanity_checks(struct dasd_device * base,struct format_data_t * fdata)2860 static int dasd_eckd_format_sanity_checks(struct dasd_device *base,
2861 struct format_data_t *fdata)
2862 {
2863 struct dasd_eckd_private *private = base->private;
2864
2865 if (fdata->start_unit >=
2866 (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2867 dev_warn(&base->cdev->dev,
2868 "Start track number %u used in formatting is too big\n",
2869 fdata->start_unit);
2870 return -EINVAL;
2871 }
2872 if (fdata->stop_unit >=
2873 (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2874 dev_warn(&base->cdev->dev,
2875 "Stop track number %u used in formatting is too big\n",
2876 fdata->stop_unit);
2877 return -EINVAL;
2878 }
2879 if (fdata->start_unit > fdata->stop_unit) {
2880 dev_warn(&base->cdev->dev,
2881 "Start track %u used in formatting exceeds end track\n",
2882 fdata->start_unit);
2883 return -EINVAL;
2884 }
2885 if (dasd_check_blocksize(fdata->blksize) != 0) {
2886 dev_warn(&base->cdev->dev,
2887 "The DASD cannot be formatted with block size %u\n",
2888 fdata->blksize);
2889 return -EINVAL;
2890 }
2891 return 0;
2892 }
2893
2894 /*
2895 * This function will process format_data originally coming from an IOCTL
2896 */
dasd_eckd_format_process_data(struct dasd_device * base,struct format_data_t * fdata,int enable_pav,int tpm,struct eckd_count * fmt_buffer,int rpt,struct irb * irb)2897 static int dasd_eckd_format_process_data(struct dasd_device *base,
2898 struct format_data_t *fdata,
2899 int enable_pav, int tpm,
2900 struct eckd_count *fmt_buffer, int rpt,
2901 struct irb *irb)
2902 {
2903 struct dasd_eckd_private *private = base->private;
2904 struct dasd_ccw_req *cqr, *n;
2905 struct list_head format_queue;
2906 struct dasd_device *device;
2907 char *sense = NULL;
2908 int old_start, old_stop, format_step;
2909 int step, retry;
2910 int rc;
2911
2912 rc = dasd_eckd_format_sanity_checks(base, fdata);
2913 if (rc)
2914 return rc;
2915
2916 INIT_LIST_HEAD(&format_queue);
2917
2918 old_start = fdata->start_unit;
2919 old_stop = fdata->stop_unit;
2920
2921 if (!tpm && fmt_buffer != NULL) {
2922 /* Command Mode / Format Check */
2923 format_step = 1;
2924 } else if (tpm && fmt_buffer != NULL) {
2925 /* Transport Mode / Format Check */
2926 format_step = DASD_CQR_MAX_CCW / rpt;
2927 } else {
2928 /* Normal Formatting */
2929 format_step = DASD_CQR_MAX_CCW /
2930 recs_per_track(&private->rdc_data, 0, fdata->blksize);
2931 }
2932
2933 do {
2934 retry = 0;
2935 while (fdata->start_unit <= old_stop) {
2936 step = fdata->stop_unit - fdata->start_unit + 1;
2937 if (step > format_step) {
2938 fdata->stop_unit =
2939 fdata->start_unit + format_step - 1;
2940 }
2941
2942 cqr = dasd_eckd_format_build_ccw_req(base, fdata,
2943 enable_pav, tpm,
2944 fmt_buffer, rpt);
2945 if (IS_ERR(cqr)) {
2946 rc = PTR_ERR(cqr);
2947 if (rc == -ENOMEM) {
2948 if (list_empty(&format_queue))
2949 goto out;
2950 /*
2951 * not enough memory available, start
2952 * requests retry after first requests
2953 * were finished
2954 */
2955 retry = 1;
2956 break;
2957 }
2958 goto out_err;
2959 }
2960 list_add_tail(&cqr->blocklist, &format_queue);
2961
2962 if (fmt_buffer) {
2963 step = fdata->stop_unit - fdata->start_unit + 1;
2964 fmt_buffer += rpt * step;
2965 }
2966 fdata->start_unit = fdata->stop_unit + 1;
2967 fdata->stop_unit = old_stop;
2968 }
2969
2970 rc = dasd_sleep_on_queue(&format_queue);
2971
2972 out_err:
2973 list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2974 device = cqr->startdev;
2975 private = device->private;
2976
2977 if (cqr->status == DASD_CQR_FAILED) {
2978 /*
2979 * Only get sense data if called by format
2980 * check
2981 */
2982 if (fmt_buffer && irb) {
2983 sense = dasd_get_sense(&cqr->irb);
2984 memcpy(irb, &cqr->irb, sizeof(*irb));
2985 }
2986 rc = -EIO;
2987 }
2988 list_del_init(&cqr->blocklist);
2989 dasd_ffree_request(cqr, device);
2990 private->count--;
2991 }
2992
2993 if (rc && rc != -EIO)
2994 goto out;
2995 if (rc == -EIO) {
2996 /*
2997 * In case fewer than the expected records are on the
2998 * track, we will most likely get a 'No Record Found'
2999 * error (in command mode) or a 'File Protected' error
3000 * (in transport mode). Those particular cases shouldn't
3001 * pass the -EIO to the IOCTL, therefore reset the rc
3002 * and continue.
3003 */
3004 if (sense &&
3005 (sense[1] & SNS1_NO_REC_FOUND ||
3006 sense[1] & SNS1_FILE_PROTECTED))
3007 retry = 1;
3008 else
3009 goto out;
3010 }
3011
3012 } while (retry);
3013
3014 out:
3015 fdata->start_unit = old_start;
3016 fdata->stop_unit = old_stop;
3017
3018 return rc;
3019 }
3020
dasd_eckd_format_device(struct dasd_device * base,struct format_data_t * fdata,int enable_pav)3021 static int dasd_eckd_format_device(struct dasd_device *base,
3022 struct format_data_t *fdata, int enable_pav)
3023 {
3024 return dasd_eckd_format_process_data(base, fdata, enable_pav, 0, NULL,
3025 0, NULL);
3026 }
3027
test_and_set_format_track(struct dasd_format_entry * to_format,struct dasd_ccw_req * cqr)3028 static bool test_and_set_format_track(struct dasd_format_entry *to_format,
3029 struct dasd_ccw_req *cqr)
3030 {
3031 struct dasd_block *block = cqr->block;
3032 struct dasd_format_entry *format;
3033 unsigned long flags;
3034 bool rc = false;
3035
3036 spin_lock_irqsave(&block->format_lock, flags);
3037 if (cqr->trkcount != atomic_read(&block->trkcount)) {
3038 /*
3039 * The number of formatted tracks has changed after request
3040 * start and we can not tell if the current track was involved.
3041 * To avoid data corruption treat it as if the current track is
3042 * involved
3043 */
3044 rc = true;
3045 goto out;
3046 }
3047 list_for_each_entry(format, &block->format_list, list) {
3048 if (format->track == to_format->track) {
3049 rc = true;
3050 goto out;
3051 }
3052 }
3053 list_add_tail(&to_format->list, &block->format_list);
3054
3055 out:
3056 spin_unlock_irqrestore(&block->format_lock, flags);
3057 return rc;
3058 }
3059
clear_format_track(struct dasd_format_entry * format,struct dasd_block * block)3060 static void clear_format_track(struct dasd_format_entry *format,
3061 struct dasd_block *block)
3062 {
3063 unsigned long flags;
3064
3065 spin_lock_irqsave(&block->format_lock, flags);
3066 atomic_inc(&block->trkcount);
3067 list_del_init(&format->list);
3068 spin_unlock_irqrestore(&block->format_lock, flags);
3069 }
3070
3071 /*
3072 * Callback function to free ESE format requests.
3073 */
dasd_eckd_ese_format_cb(struct dasd_ccw_req * cqr,void * data)3074 static void dasd_eckd_ese_format_cb(struct dasd_ccw_req *cqr, void *data)
3075 {
3076 struct dasd_device *device = cqr->startdev;
3077 struct dasd_eckd_private *private = device->private;
3078 struct dasd_format_entry *format = data;
3079
3080 clear_format_track(format, cqr->basedev->block);
3081 private->count--;
3082 dasd_ffree_request(cqr, device);
3083 }
3084
3085 static struct dasd_ccw_req *
dasd_eckd_ese_format(struct dasd_device * startdev,struct dasd_ccw_req * cqr,struct irb * irb)3086 dasd_eckd_ese_format(struct dasd_device *startdev, struct dasd_ccw_req *cqr,
3087 struct irb *irb)
3088 {
3089 struct dasd_eckd_private *private;
3090 struct dasd_format_entry *format;
3091 struct format_data_t fdata;
3092 unsigned int recs_per_trk;
3093 struct dasd_ccw_req *fcqr;
3094 struct dasd_device *base;
3095 struct dasd_block *block;
3096 unsigned int blksize;
3097 struct request *req;
3098 sector_t first_trk;
3099 sector_t last_trk;
3100 sector_t curr_trk;
3101 int rc;
3102
3103 req = dasd_get_callback_data(cqr);
3104 block = cqr->block;
3105 base = block->base;
3106 private = base->private;
3107 blksize = block->bp_block;
3108 recs_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3109 format = &startdev->format_entry;
3110
3111 first_trk = blk_rq_pos(req) >> block->s2b_shift;
3112 sector_div(first_trk, recs_per_trk);
3113 last_trk =
3114 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3115 sector_div(last_trk, recs_per_trk);
3116 rc = dasd_eckd_track_from_irb(irb, base, &curr_trk);
3117 if (rc)
3118 return ERR_PTR(rc);
3119
3120 if (curr_trk < first_trk || curr_trk > last_trk) {
3121 DBF_DEV_EVENT(DBF_WARNING, startdev,
3122 "ESE error track %llu not within range %llu - %llu\n",
3123 curr_trk, first_trk, last_trk);
3124 return ERR_PTR(-EINVAL);
3125 }
3126 format->track = curr_trk;
3127 /* test if track is already in formatting by another thread */
3128 if (test_and_set_format_track(format, cqr)) {
3129 /* this is no real error so do not count down retries */
3130 cqr->retries++;
3131 return ERR_PTR(-EEXIST);
3132 }
3133
3134 fdata.start_unit = curr_trk;
3135 fdata.stop_unit = curr_trk;
3136 fdata.blksize = blksize;
3137 fdata.intensity = private->uses_cdl ? DASD_FMT_INT_COMPAT : 0;
3138
3139 rc = dasd_eckd_format_sanity_checks(base, &fdata);
3140 if (rc)
3141 return ERR_PTR(-EINVAL);
3142
3143 /*
3144 * We're building the request with PAV disabled as we're reusing
3145 * the former startdev.
3146 */
3147 fcqr = dasd_eckd_build_format(base, startdev, &fdata, 0);
3148 if (IS_ERR(fcqr))
3149 return fcqr;
3150
3151 fcqr->callback = dasd_eckd_ese_format_cb;
3152 fcqr->callback_data = (void *) format;
3153
3154 return fcqr;
3155 }
3156
3157 /*
3158 * When data is read from an unformatted area of an ESE volume, this function
3159 * returns zeroed data and thereby mimics a read of zero data.
3160 *
3161 * The first unformatted track is the one that got the NRF error, the address is
3162 * encoded in the sense data.
3163 *
3164 * All tracks before have returned valid data and should not be touched.
3165 * All tracks after the unformatted track might be formatted or not. This is
3166 * currently not known, remember the processed data and return the remainder of
3167 * the request to the blocklayer in __dasd_cleanup_cqr().
3168 */
dasd_eckd_ese_read(struct dasd_ccw_req * cqr,struct irb * irb)3169 static int dasd_eckd_ese_read(struct dasd_ccw_req *cqr, struct irb *irb)
3170 {
3171 struct dasd_eckd_private *private;
3172 sector_t first_trk, last_trk;
3173 sector_t first_blk, last_blk;
3174 unsigned int blksize, off;
3175 unsigned int recs_per_trk;
3176 struct dasd_device *base;
3177 struct req_iterator iter;
3178 struct dasd_block *block;
3179 unsigned int skip_block;
3180 unsigned int blk_count;
3181 struct request *req;
3182 struct bio_vec bv;
3183 sector_t curr_trk;
3184 sector_t end_blk;
3185 char *dst;
3186 int rc;
3187
3188 req = (struct request *) cqr->callback_data;
3189 base = cqr->block->base;
3190 blksize = base->block->bp_block;
3191 block = cqr->block;
3192 private = base->private;
3193 skip_block = 0;
3194 blk_count = 0;
3195
3196 recs_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3197 first_trk = first_blk = blk_rq_pos(req) >> block->s2b_shift;
3198 sector_div(first_trk, recs_per_trk);
3199 last_trk = last_blk =
3200 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3201 sector_div(last_trk, recs_per_trk);
3202 rc = dasd_eckd_track_from_irb(irb, base, &curr_trk);
3203 if (rc)
3204 return rc;
3205
3206 /* sanity check if the current track from sense data is valid */
3207 if (curr_trk < first_trk || curr_trk > last_trk) {
3208 DBF_DEV_EVENT(DBF_WARNING, base,
3209 "ESE error track %llu not within range %llu - %llu\n",
3210 curr_trk, first_trk, last_trk);
3211 return -EINVAL;
3212 }
3213
3214 /*
3215 * if not the first track got the NRF error we have to skip over valid
3216 * blocks
3217 */
3218 if (curr_trk != first_trk)
3219 skip_block = curr_trk * recs_per_trk - first_blk;
3220
3221 /* we have no information beyond the current track */
3222 end_blk = (curr_trk + 1) * recs_per_trk;
3223
3224 rq_for_each_segment(bv, req, iter) {
3225 dst = page_address(bv.bv_page) + bv.bv_offset;
3226 for (off = 0; off < bv.bv_len; off += blksize) {
3227 if (first_blk + blk_count >= end_blk) {
3228 cqr->proc_bytes = blk_count * blksize;
3229 return 0;
3230 }
3231 if (dst && !skip_block)
3232 memset(dst, 0, blksize);
3233 else
3234 skip_block--;
3235 dst += blksize;
3236 blk_count++;
3237 }
3238 }
3239 return 0;
3240 }
3241
3242 /*
3243 * Helper function to count consecutive records of a single track.
3244 */
dasd_eckd_count_records(struct eckd_count * fmt_buffer,int start,int max)3245 static int dasd_eckd_count_records(struct eckd_count *fmt_buffer, int start,
3246 int max)
3247 {
3248 int head;
3249 int i;
3250
3251 head = fmt_buffer[start].head;
3252
3253 /*
3254 * There are 3 conditions where we stop counting:
3255 * - if data reoccurs (same head and record may reoccur), which may
3256 * happen due to the way DASD_ECKD_CCW_READ_COUNT works
3257 * - when the head changes, because we're iterating over several tracks
3258 * then (DASD_ECKD_CCW_READ_COUNT_MT)
3259 * - when we've reached the end of sensible data in the buffer (the
3260 * record will be 0 then)
3261 */
3262 for (i = start; i < max; i++) {
3263 if (i > start) {
3264 if ((fmt_buffer[i].head == head &&
3265 fmt_buffer[i].record == 1) ||
3266 fmt_buffer[i].head != head ||
3267 fmt_buffer[i].record == 0)
3268 break;
3269 }
3270 }
3271
3272 return i - start;
3273 }
3274
3275 /*
3276 * Evaluate a given range of tracks. Data like number of records, blocksize,
3277 * record ids, and key length are compared with expected data.
3278 *
3279 * If a mismatch occurs, the corresponding error bit is set, as well as
3280 * additional information, depending on the error.
3281 */
dasd_eckd_format_evaluate_tracks(struct eckd_count * fmt_buffer,struct format_check_t * cdata,int rpt_max,int rpt_exp,int trk_per_cyl,int tpm)3282 static void dasd_eckd_format_evaluate_tracks(struct eckd_count *fmt_buffer,
3283 struct format_check_t *cdata,
3284 int rpt_max, int rpt_exp,
3285 int trk_per_cyl, int tpm)
3286 {
3287 struct ch_t geo;
3288 int max_entries;
3289 int count = 0;
3290 int trkcount;
3291 int blksize;
3292 int pos = 0;
3293 int i, j;
3294 int kl;
3295
3296 trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
3297 max_entries = trkcount * rpt_max;
3298
3299 for (i = cdata->expect.start_unit; i <= cdata->expect.stop_unit; i++) {
3300 /* Calculate the correct next starting position in the buffer */
3301 if (tpm) {
3302 while (fmt_buffer[pos].record == 0 &&
3303 fmt_buffer[pos].dl == 0) {
3304 if (pos++ > max_entries)
3305 break;
3306 }
3307 } else {
3308 if (i != cdata->expect.start_unit)
3309 pos += rpt_max - count;
3310 }
3311
3312 /* Calculate the expected geo values for the current track */
3313 set_ch_t(&geo, i / trk_per_cyl, i % trk_per_cyl);
3314
3315 /* Count and check number of records */
3316 count = dasd_eckd_count_records(fmt_buffer, pos, pos + rpt_max);
3317
3318 if (count < rpt_exp) {
3319 cdata->result = DASD_FMT_ERR_TOO_FEW_RECORDS;
3320 break;
3321 }
3322 if (count > rpt_exp) {
3323 cdata->result = DASD_FMT_ERR_TOO_MANY_RECORDS;
3324 break;
3325 }
3326
3327 for (j = 0; j < count; j++, pos++) {
3328 blksize = cdata->expect.blksize;
3329 kl = 0;
3330
3331 /*
3332 * Set special values when checking CDL formatted
3333 * devices.
3334 */
3335 if ((cdata->expect.intensity & 0x08) &&
3336 geo.cyl == 0 && geo.head == 0) {
3337 if (j < 3) {
3338 blksize = sizes_trk0[j] - 4;
3339 kl = 4;
3340 }
3341 }
3342 if ((cdata->expect.intensity & 0x08) &&
3343 geo.cyl == 0 && geo.head == 1) {
3344 blksize = LABEL_SIZE - 44;
3345 kl = 44;
3346 }
3347
3348 /* Check blocksize */
3349 if (fmt_buffer[pos].dl != blksize) {
3350 cdata->result = DASD_FMT_ERR_BLKSIZE;
3351 goto out;
3352 }
3353 /* Check if key length is 0 */
3354 if (fmt_buffer[pos].kl != kl) {
3355 cdata->result = DASD_FMT_ERR_KEY_LENGTH;
3356 goto out;
3357 }
3358 /* Check if record_id is correct */
3359 if (fmt_buffer[pos].cyl != geo.cyl ||
3360 fmt_buffer[pos].head != geo.head ||
3361 fmt_buffer[pos].record != (j + 1)) {
3362 cdata->result = DASD_FMT_ERR_RECORD_ID;
3363 goto out;
3364 }
3365 }
3366 }
3367
3368 out:
3369 /*
3370 * In case of no errors, we need to decrease by one
3371 * to get the correct positions.
3372 */
3373 if (!cdata->result) {
3374 i--;
3375 pos--;
3376 }
3377
3378 cdata->unit = i;
3379 cdata->num_records = count;
3380 cdata->rec = fmt_buffer[pos].record;
3381 cdata->blksize = fmt_buffer[pos].dl;
3382 cdata->key_length = fmt_buffer[pos].kl;
3383 }
3384
3385 /*
3386 * Check the format of a range of tracks of a DASD.
3387 */
dasd_eckd_check_device_format(struct dasd_device * base,struct format_check_t * cdata,int enable_pav)3388 static int dasd_eckd_check_device_format(struct dasd_device *base,
3389 struct format_check_t *cdata,
3390 int enable_pav)
3391 {
3392 struct dasd_eckd_private *private = base->private;
3393 struct eckd_count *fmt_buffer;
3394 struct irb irb;
3395 int rpt_max, rpt_exp;
3396 int fmt_buffer_size;
3397 int trk_per_cyl;
3398 int trkcount;
3399 int tpm = 0;
3400 int rc;
3401
3402 trk_per_cyl = private->rdc_data.trk_per_cyl;
3403
3404 /* Get maximum and expected amount of records per track */
3405 rpt_max = recs_per_track(&private->rdc_data, 0, 512) + 1;
3406 rpt_exp = recs_per_track(&private->rdc_data, 0, cdata->expect.blksize);
3407
3408 trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
3409 fmt_buffer_size = trkcount * rpt_max * sizeof(struct eckd_count);
3410
3411 fmt_buffer = kzalloc(fmt_buffer_size, GFP_KERNEL | GFP_DMA);
3412 if (!fmt_buffer)
3413 return -ENOMEM;
3414
3415 /*
3416 * A certain FICON feature subset is needed to operate in transport
3417 * mode. Additionally, the support for transport mode is implicitly
3418 * checked by comparing the buffer size with fcx_max_data. As long as
3419 * the buffer size is smaller we can operate in transport mode and
3420 * process multiple tracks. If not, only one track at once is being
3421 * processed using command mode.
3422 */
3423 if ((private->features.feature[40] & 0x04) &&
3424 fmt_buffer_size <= private->fcx_max_data)
3425 tpm = 1;
3426
3427 rc = dasd_eckd_format_process_data(base, &cdata->expect, enable_pav,
3428 tpm, fmt_buffer, rpt_max, &irb);
3429 if (rc && rc != -EIO)
3430 goto out;
3431 if (rc == -EIO) {
3432 /*
3433 * If our first attempt with transport mode enabled comes back
3434 * with an incorrect length error, we're going to retry the
3435 * check with command mode.
3436 */
3437 if (tpm && scsw_cstat(&irb.scsw) == 0x40) {
3438 tpm = 0;
3439 rc = dasd_eckd_format_process_data(base, &cdata->expect,
3440 enable_pav, tpm,
3441 fmt_buffer, rpt_max,
3442 &irb);
3443 if (rc)
3444 goto out;
3445 } else {
3446 goto out;
3447 }
3448 }
3449
3450 dasd_eckd_format_evaluate_tracks(fmt_buffer, cdata, rpt_max, rpt_exp,
3451 trk_per_cyl, tpm);
3452
3453 out:
3454 kfree(fmt_buffer);
3455
3456 return rc;
3457 }
3458
dasd_eckd_handle_terminated_request(struct dasd_ccw_req * cqr)3459 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
3460 {
3461 if (cqr->retries < 0) {
3462 cqr->status = DASD_CQR_FAILED;
3463 return;
3464 }
3465 cqr->status = DASD_CQR_FILLED;
3466 if (cqr->block && (cqr->startdev != cqr->block->base)) {
3467 dasd_eckd_reset_ccw_to_base_io(cqr);
3468 cqr->startdev = cqr->block->base;
3469 cqr->lpm = dasd_path_get_opm(cqr->block->base);
3470 }
3471 };
3472
3473 static dasd_erp_fn_t
dasd_eckd_erp_action(struct dasd_ccw_req * cqr)3474 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
3475 {
3476 struct dasd_device *device = (struct dasd_device *) cqr->startdev;
3477 struct ccw_device *cdev = device->cdev;
3478
3479 switch (cdev->id.cu_type) {
3480 case 0x3990:
3481 case 0x2105:
3482 case 0x2107:
3483 case 0x1750:
3484 return dasd_3990_erp_action;
3485 case 0x9343:
3486 case 0x3880:
3487 default:
3488 return dasd_default_erp_action;
3489 }
3490 }
3491
3492 static dasd_erp_fn_t
dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)3493 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
3494 {
3495 return dasd_default_erp_postaction;
3496 }
3497
dasd_eckd_check_for_device_change(struct dasd_device * device,struct dasd_ccw_req * cqr,struct irb * irb)3498 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
3499 struct dasd_ccw_req *cqr,
3500 struct irb *irb)
3501 {
3502 char mask;
3503 char *sense = NULL;
3504 struct dasd_eckd_private *private = device->private;
3505
3506 /* first of all check for state change pending interrupt */
3507 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
3508 if ((scsw_dstat(&irb->scsw) & mask) == mask) {
3509 /*
3510 * for alias only, not in offline processing
3511 * and only if not suspended
3512 */
3513 if (!device->block && private->lcu &&
3514 device->state == DASD_STATE_ONLINE &&
3515 !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3516 !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
3517 /* schedule worker to reload device */
3518 dasd_reload_device(device);
3519 }
3520 dasd_generic_handle_state_change(device);
3521 return;
3522 }
3523
3524 sense = dasd_get_sense(irb);
3525 if (!sense)
3526 return;
3527
3528 /* summary unit check */
3529 if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
3530 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
3531 if (test_and_set_bit(DASD_FLAG_SUC, &device->flags)) {
3532 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3533 "eckd suc: device already notified");
3534 return;
3535 }
3536 sense = dasd_get_sense(irb);
3537 if (!sense) {
3538 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3539 "eckd suc: no reason code available");
3540 clear_bit(DASD_FLAG_SUC, &device->flags);
3541 return;
3542
3543 }
3544 private->suc_reason = sense[8];
3545 DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
3546 "eckd handle summary unit check: reason",
3547 private->suc_reason);
3548 dasd_get_device(device);
3549 if (!schedule_work(&device->suc_work))
3550 dasd_put_device(device);
3551
3552 return;
3553 }
3554
3555 /* service information message SIM */
3556 if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
3557 ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
3558 dasd_3990_erp_handle_sim(device, sense);
3559 return;
3560 }
3561
3562 /* loss of device reservation is handled via base devices only
3563 * as alias devices may be used with several bases
3564 */
3565 if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
3566 (sense[7] == 0x3F) &&
3567 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
3568 test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
3569 if (device->features & DASD_FEATURE_FAILONSLCK)
3570 set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
3571 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3572 dev_err(&device->cdev->dev,
3573 "The device reservation was lost\n");
3574 }
3575 }
3576
dasd_eckd_ras_sanity_checks(struct dasd_device * device,unsigned int first_trk,unsigned int last_trk)3577 static int dasd_eckd_ras_sanity_checks(struct dasd_device *device,
3578 unsigned int first_trk,
3579 unsigned int last_trk)
3580 {
3581 struct dasd_eckd_private *private = device->private;
3582 unsigned int trks_per_vol;
3583 int rc = 0;
3584
3585 trks_per_vol = private->real_cyl * private->rdc_data.trk_per_cyl;
3586
3587 if (first_trk >= trks_per_vol) {
3588 dev_warn(&device->cdev->dev,
3589 "Start track number %u used in the space release command is too big\n",
3590 first_trk);
3591 rc = -EINVAL;
3592 } else if (last_trk >= trks_per_vol) {
3593 dev_warn(&device->cdev->dev,
3594 "Stop track number %u used in the space release command is too big\n",
3595 last_trk);
3596 rc = -EINVAL;
3597 } else if (first_trk > last_trk) {
3598 dev_warn(&device->cdev->dev,
3599 "Start track %u used in the space release command exceeds the end track\n",
3600 first_trk);
3601 rc = -EINVAL;
3602 }
3603 return rc;
3604 }
3605
3606 /*
3607 * Helper function to count the amount of involved extents within a given range
3608 * with extent alignment in mind.
3609 */
count_exts(unsigned int from,unsigned int to,int trks_per_ext)3610 static int count_exts(unsigned int from, unsigned int to, int trks_per_ext)
3611 {
3612 int cur_pos = 0;
3613 int count = 0;
3614 int tmp;
3615
3616 if (from == to)
3617 return 1;
3618
3619 /* Count first partial extent */
3620 if (from % trks_per_ext != 0) {
3621 tmp = from + trks_per_ext - (from % trks_per_ext) - 1;
3622 if (tmp > to)
3623 tmp = to;
3624 cur_pos = tmp - from + 1;
3625 count++;
3626 }
3627 /* Count full extents */
3628 if (to - (from + cur_pos) + 1 >= trks_per_ext) {
3629 tmp = to - ((to - trks_per_ext + 1) % trks_per_ext);
3630 count += (tmp - (from + cur_pos) + 1) / trks_per_ext;
3631 cur_pos = tmp;
3632 }
3633 /* Count last partial extent */
3634 if (cur_pos < to)
3635 count++;
3636
3637 return count;
3638 }
3639
3640 /*
3641 * Release allocated space for a given range or an entire volume.
3642 */
3643 static struct dasd_ccw_req *
dasd_eckd_dso_ras(struct dasd_device * device,struct dasd_block * block,struct request * req,unsigned int first_trk,unsigned int last_trk,int by_extent)3644 dasd_eckd_dso_ras(struct dasd_device *device, struct dasd_block *block,
3645 struct request *req, unsigned int first_trk,
3646 unsigned int last_trk, int by_extent)
3647 {
3648 struct dasd_eckd_private *private = device->private;
3649 struct dasd_dso_ras_ext_range *ras_range;
3650 struct dasd_rssd_features *features;
3651 struct dasd_dso_ras_data *ras_data;
3652 u16 heads, beg_head, end_head;
3653 int cur_to_trk, cur_from_trk;
3654 struct dasd_ccw_req *cqr;
3655 u32 beg_cyl, end_cyl;
3656 struct ccw1 *ccw;
3657 int trks_per_ext;
3658 size_t ras_size;
3659 size_t size;
3660 int nr_exts;
3661 void *rq;
3662 int i;
3663
3664 if (dasd_eckd_ras_sanity_checks(device, first_trk, last_trk))
3665 return ERR_PTR(-EINVAL);
3666
3667 rq = req ? blk_mq_rq_to_pdu(req) : NULL;
3668
3669 features = &private->features;
3670
3671 trks_per_ext = dasd_eckd_ext_size(device) * private->rdc_data.trk_per_cyl;
3672 nr_exts = 0;
3673 if (by_extent)
3674 nr_exts = count_exts(first_trk, last_trk, trks_per_ext);
3675 ras_size = sizeof(*ras_data);
3676 size = ras_size + (nr_exts * sizeof(*ras_range));
3677
3678 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, size, device, rq);
3679 if (IS_ERR(cqr)) {
3680 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
3681 "Could not allocate RAS request");
3682 return cqr;
3683 }
3684
3685 ras_data = cqr->data;
3686 memset(ras_data, 0, size);
3687
3688 ras_data->order = DSO_ORDER_RAS;
3689 ras_data->flags.vol_type = 0; /* CKD volume */
3690 /* Release specified extents or entire volume */
3691 ras_data->op_flags.by_extent = by_extent;
3692 /*
3693 * This bit guarantees initialisation of tracks within an extent that is
3694 * not fully specified, but is only supported with a certain feature
3695 * subset.
3696 */
3697 ras_data->op_flags.guarantee_init = !!(features->feature[56] & 0x01);
3698 ras_data->lss = private->ned->ID;
3699 ras_data->dev_addr = private->ned->unit_addr;
3700 ras_data->nr_exts = nr_exts;
3701
3702 if (by_extent) {
3703 heads = private->rdc_data.trk_per_cyl;
3704 cur_from_trk = first_trk;
3705 cur_to_trk = first_trk + trks_per_ext -
3706 (first_trk % trks_per_ext) - 1;
3707 if (cur_to_trk > last_trk)
3708 cur_to_trk = last_trk;
3709 ras_range = (struct dasd_dso_ras_ext_range *)(cqr->data + ras_size);
3710
3711 for (i = 0; i < nr_exts; i++) {
3712 beg_cyl = cur_from_trk / heads;
3713 beg_head = cur_from_trk % heads;
3714 end_cyl = cur_to_trk / heads;
3715 end_head = cur_to_trk % heads;
3716
3717 set_ch_t(&ras_range->beg_ext, beg_cyl, beg_head);
3718 set_ch_t(&ras_range->end_ext, end_cyl, end_head);
3719
3720 cur_from_trk = cur_to_trk + 1;
3721 cur_to_trk = cur_from_trk + trks_per_ext - 1;
3722 if (cur_to_trk > last_trk)
3723 cur_to_trk = last_trk;
3724 ras_range++;
3725 }
3726 }
3727
3728 ccw = cqr->cpaddr;
3729 ccw->cda = (__u32)(addr_t)cqr->data;
3730 ccw->cmd_code = DASD_ECKD_CCW_DSO;
3731 ccw->count = size;
3732
3733 cqr->startdev = device;
3734 cqr->memdev = device;
3735 cqr->block = block;
3736 cqr->retries = 256;
3737 cqr->expires = device->default_expires * HZ;
3738 cqr->buildclk = get_tod_clock();
3739 cqr->status = DASD_CQR_FILLED;
3740
3741 return cqr;
3742 }
3743
dasd_eckd_release_space_full(struct dasd_device * device)3744 static int dasd_eckd_release_space_full(struct dasd_device *device)
3745 {
3746 struct dasd_ccw_req *cqr;
3747 int rc;
3748
3749 cqr = dasd_eckd_dso_ras(device, NULL, NULL, 0, 0, 0);
3750 if (IS_ERR(cqr))
3751 return PTR_ERR(cqr);
3752
3753 rc = dasd_sleep_on_interruptible(cqr);
3754
3755 dasd_sfree_request(cqr, cqr->memdev);
3756
3757 return rc;
3758 }
3759
dasd_eckd_release_space_trks(struct dasd_device * device,unsigned int from,unsigned int to)3760 static int dasd_eckd_release_space_trks(struct dasd_device *device,
3761 unsigned int from, unsigned int to)
3762 {
3763 struct dasd_eckd_private *private = device->private;
3764 struct dasd_block *block = device->block;
3765 struct dasd_ccw_req *cqr, *n;
3766 struct list_head ras_queue;
3767 unsigned int device_exts;
3768 int trks_per_ext;
3769 int stop, step;
3770 int cur_pos;
3771 int rc = 0;
3772 int retry;
3773
3774 INIT_LIST_HEAD(&ras_queue);
3775
3776 device_exts = private->real_cyl / dasd_eckd_ext_size(device);
3777 trks_per_ext = dasd_eckd_ext_size(device) * private->rdc_data.trk_per_cyl;
3778
3779 /* Make sure device limits are not exceeded */
3780 step = trks_per_ext * min(device_exts, DASD_ECKD_RAS_EXTS_MAX);
3781 cur_pos = from;
3782
3783 do {
3784 retry = 0;
3785 while (cur_pos < to) {
3786 stop = cur_pos + step -
3787 ((cur_pos + step) % trks_per_ext) - 1;
3788 if (stop > to)
3789 stop = to;
3790
3791 cqr = dasd_eckd_dso_ras(device, NULL, NULL, cur_pos, stop, 1);
3792 if (IS_ERR(cqr)) {
3793 rc = PTR_ERR(cqr);
3794 if (rc == -ENOMEM) {
3795 if (list_empty(&ras_queue))
3796 goto out;
3797 retry = 1;
3798 break;
3799 }
3800 goto err_out;
3801 }
3802
3803 spin_lock_irq(&block->queue_lock);
3804 list_add_tail(&cqr->blocklist, &ras_queue);
3805 spin_unlock_irq(&block->queue_lock);
3806 cur_pos = stop + 1;
3807 }
3808
3809 rc = dasd_sleep_on_queue_interruptible(&ras_queue);
3810
3811 err_out:
3812 list_for_each_entry_safe(cqr, n, &ras_queue, blocklist) {
3813 device = cqr->startdev;
3814 private = device->private;
3815
3816 spin_lock_irq(&block->queue_lock);
3817 list_del_init(&cqr->blocklist);
3818 spin_unlock_irq(&block->queue_lock);
3819 dasd_sfree_request(cqr, device);
3820 private->count--;
3821 }
3822 } while (retry);
3823
3824 out:
3825 return rc;
3826 }
3827
dasd_eckd_release_space(struct dasd_device * device,struct format_data_t * rdata)3828 static int dasd_eckd_release_space(struct dasd_device *device,
3829 struct format_data_t *rdata)
3830 {
3831 if (rdata->intensity & DASD_FMT_INT_ESE_FULL)
3832 return dasd_eckd_release_space_full(device);
3833 else if (rdata->intensity == 0)
3834 return dasd_eckd_release_space_trks(device, rdata->start_unit,
3835 rdata->stop_unit);
3836 else
3837 return -EINVAL;
3838 }
3839
dasd_eckd_build_cp_cmd_single(struct dasd_device * startdev,struct dasd_block * block,struct request * req,sector_t first_rec,sector_t last_rec,sector_t first_trk,sector_t last_trk,unsigned int first_offs,unsigned int last_offs,unsigned int blk_per_trk,unsigned int blksize)3840 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
3841 struct dasd_device *startdev,
3842 struct dasd_block *block,
3843 struct request *req,
3844 sector_t first_rec,
3845 sector_t last_rec,
3846 sector_t first_trk,
3847 sector_t last_trk,
3848 unsigned int first_offs,
3849 unsigned int last_offs,
3850 unsigned int blk_per_trk,
3851 unsigned int blksize)
3852 {
3853 struct dasd_eckd_private *private;
3854 unsigned long *idaws;
3855 struct LO_eckd_data *LO_data;
3856 struct dasd_ccw_req *cqr;
3857 struct ccw1 *ccw;
3858 struct req_iterator iter;
3859 struct bio_vec bv;
3860 char *dst;
3861 unsigned int off;
3862 int count, cidaw, cplength, datasize;
3863 sector_t recid;
3864 unsigned char cmd, rcmd;
3865 int use_prefix;
3866 struct dasd_device *basedev;
3867
3868 basedev = block->base;
3869 private = basedev->private;
3870 if (rq_data_dir(req) == READ)
3871 cmd = DASD_ECKD_CCW_READ_MT;
3872 else if (rq_data_dir(req) == WRITE)
3873 cmd = DASD_ECKD_CCW_WRITE_MT;
3874 else
3875 return ERR_PTR(-EINVAL);
3876
3877 /* Check struct bio and count the number of blocks for the request. */
3878 count = 0;
3879 cidaw = 0;
3880 rq_for_each_segment(bv, req, iter) {
3881 if (bv.bv_len & (blksize - 1))
3882 /* Eckd can only do full blocks. */
3883 return ERR_PTR(-EINVAL);
3884 count += bv.bv_len >> (block->s2b_shift + 9);
3885 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
3886 cidaw += bv.bv_len >> (block->s2b_shift + 9);
3887 }
3888 /* Paranoia. */
3889 if (count != last_rec - first_rec + 1)
3890 return ERR_PTR(-EINVAL);
3891
3892 /* use the prefix command if available */
3893 use_prefix = private->features.feature[8] & 0x01;
3894 if (use_prefix) {
3895 /* 1x prefix + number of blocks */
3896 cplength = 2 + count;
3897 /* 1x prefix + cidaws*sizeof(long) */
3898 datasize = sizeof(struct PFX_eckd_data) +
3899 sizeof(struct LO_eckd_data) +
3900 cidaw * sizeof(unsigned long);
3901 } else {
3902 /* 1x define extent + 1x locate record + number of blocks */
3903 cplength = 2 + count;
3904 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
3905 datasize = sizeof(struct DE_eckd_data) +
3906 sizeof(struct LO_eckd_data) +
3907 cidaw * sizeof(unsigned long);
3908 }
3909 /* Find out the number of additional locate record ccws for cdl. */
3910 if (private->uses_cdl && first_rec < 2*blk_per_trk) {
3911 if (last_rec >= 2*blk_per_trk)
3912 count = 2*blk_per_trk - first_rec;
3913 cplength += count;
3914 datasize += count*sizeof(struct LO_eckd_data);
3915 }
3916 /* Allocate the ccw request. */
3917 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3918 startdev, blk_mq_rq_to_pdu(req));
3919 if (IS_ERR(cqr))
3920 return cqr;
3921 ccw = cqr->cpaddr;
3922 /* First ccw is define extent or prefix. */
3923 if (use_prefix) {
3924 if (prefix(ccw++, cqr->data, first_trk,
3925 last_trk, cmd, basedev, startdev) == -EAGAIN) {
3926 /* Clock not in sync and XRC is enabled.
3927 * Try again later.
3928 */
3929 dasd_sfree_request(cqr, startdev);
3930 return ERR_PTR(-EAGAIN);
3931 }
3932 idaws = (unsigned long *) (cqr->data +
3933 sizeof(struct PFX_eckd_data));
3934 } else {
3935 if (define_extent(ccw++, cqr->data, first_trk,
3936 last_trk, cmd, basedev, 0) == -EAGAIN) {
3937 /* Clock not in sync and XRC is enabled.
3938 * Try again later.
3939 */
3940 dasd_sfree_request(cqr, startdev);
3941 return ERR_PTR(-EAGAIN);
3942 }
3943 idaws = (unsigned long *) (cqr->data +
3944 sizeof(struct DE_eckd_data));
3945 }
3946 /* Build locate_record+read/write/ccws. */
3947 LO_data = (struct LO_eckd_data *) (idaws + cidaw);
3948 recid = first_rec;
3949 if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
3950 /* Only standard blocks so there is just one locate record. */
3951 ccw[-1].flags |= CCW_FLAG_CC;
3952 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
3953 last_rec - recid + 1, cmd, basedev, blksize);
3954 }
3955 rq_for_each_segment(bv, req, iter) {
3956 dst = page_address(bv.bv_page) + bv.bv_offset;
3957 if (dasd_page_cache) {
3958 char *copy = kmem_cache_alloc(dasd_page_cache,
3959 GFP_DMA | __GFP_NOWARN);
3960 if (copy && rq_data_dir(req) == WRITE)
3961 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
3962 if (copy)
3963 dst = copy + bv.bv_offset;
3964 }
3965 for (off = 0; off < bv.bv_len; off += blksize) {
3966 sector_t trkid = recid;
3967 unsigned int recoffs = sector_div(trkid, blk_per_trk);
3968 rcmd = cmd;
3969 count = blksize;
3970 /* Locate record for cdl special block ? */
3971 if (private->uses_cdl && recid < 2*blk_per_trk) {
3972 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
3973 rcmd |= 0x8;
3974 count = dasd_eckd_cdl_reclen(recid);
3975 if (count < blksize &&
3976 rq_data_dir(req) == READ)
3977 memset(dst + count, 0xe5,
3978 blksize - count);
3979 }
3980 ccw[-1].flags |= CCW_FLAG_CC;
3981 locate_record(ccw++, LO_data++,
3982 trkid, recoffs + 1,
3983 1, rcmd, basedev, count);
3984 }
3985 /* Locate record for standard blocks ? */
3986 if (private->uses_cdl && recid == 2*blk_per_trk) {
3987 ccw[-1].flags |= CCW_FLAG_CC;
3988 locate_record(ccw++, LO_data++,
3989 trkid, recoffs + 1,
3990 last_rec - recid + 1,
3991 cmd, basedev, count);
3992 }
3993 /* Read/write ccw. */
3994 ccw[-1].flags |= CCW_FLAG_CC;
3995 ccw->cmd_code = rcmd;
3996 ccw->count = count;
3997 if (idal_is_needed(dst, blksize)) {
3998 ccw->cda = (__u32)(addr_t) idaws;
3999 ccw->flags = CCW_FLAG_IDA;
4000 idaws = idal_create_words(idaws, dst, blksize);
4001 } else {
4002 ccw->cda = (__u32)(addr_t) dst;
4003 ccw->flags = 0;
4004 }
4005 ccw++;
4006 dst += blksize;
4007 recid++;
4008 }
4009 }
4010 if (blk_noretry_request(req) ||
4011 block->base->features & DASD_FEATURE_FAILFAST)
4012 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4013 cqr->startdev = startdev;
4014 cqr->memdev = startdev;
4015 cqr->block = block;
4016 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
4017 cqr->lpm = dasd_path_get_ppm(startdev);
4018 cqr->retries = startdev->default_retries;
4019 cqr->buildclk = get_tod_clock();
4020 cqr->status = DASD_CQR_FILLED;
4021
4022 /* Set flags to suppress output for expected errors */
4023 if (dasd_eckd_is_ese(basedev)) {
4024 set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
4025 set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
4026 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4027 }
4028
4029 return cqr;
4030 }
4031
dasd_eckd_build_cp_cmd_track(struct dasd_device * startdev,struct dasd_block * block,struct request * req,sector_t first_rec,sector_t last_rec,sector_t first_trk,sector_t last_trk,unsigned int first_offs,unsigned int last_offs,unsigned int blk_per_trk,unsigned int blksize)4032 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
4033 struct dasd_device *startdev,
4034 struct dasd_block *block,
4035 struct request *req,
4036 sector_t first_rec,
4037 sector_t last_rec,
4038 sector_t first_trk,
4039 sector_t last_trk,
4040 unsigned int first_offs,
4041 unsigned int last_offs,
4042 unsigned int blk_per_trk,
4043 unsigned int blksize)
4044 {
4045 unsigned long *idaws;
4046 struct dasd_ccw_req *cqr;
4047 struct ccw1 *ccw;
4048 struct req_iterator iter;
4049 struct bio_vec bv;
4050 char *dst, *idaw_dst;
4051 unsigned int cidaw, cplength, datasize;
4052 unsigned int tlf;
4053 sector_t recid;
4054 unsigned char cmd;
4055 struct dasd_device *basedev;
4056 unsigned int trkcount, count, count_to_trk_end;
4057 unsigned int idaw_len, seg_len, part_len, len_to_track_end;
4058 unsigned char new_track, end_idaw;
4059 sector_t trkid;
4060 unsigned int recoffs;
4061
4062 basedev = block->base;
4063 if (rq_data_dir(req) == READ)
4064 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
4065 else if (rq_data_dir(req) == WRITE)
4066 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
4067 else
4068 return ERR_PTR(-EINVAL);
4069
4070 /* Track based I/O needs IDAWs for each page, and not just for
4071 * 64 bit addresses. We need additional idals for pages
4072 * that get filled from two tracks, so we use the number
4073 * of records as upper limit.
4074 */
4075 cidaw = last_rec - first_rec + 1;
4076 trkcount = last_trk - first_trk + 1;
4077
4078 /* 1x prefix + one read/write ccw per track */
4079 cplength = 1 + trkcount;
4080
4081 datasize = sizeof(struct PFX_eckd_data) + cidaw * sizeof(unsigned long);
4082
4083 /* Allocate the ccw request. */
4084 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
4085 startdev, blk_mq_rq_to_pdu(req));
4086 if (IS_ERR(cqr))
4087 return cqr;
4088 ccw = cqr->cpaddr;
4089 /* transfer length factor: how many bytes to read from the last track */
4090 if (first_trk == last_trk)
4091 tlf = last_offs - first_offs + 1;
4092 else
4093 tlf = last_offs + 1;
4094 tlf *= blksize;
4095
4096 if (prefix_LRE(ccw++, cqr->data, first_trk,
4097 last_trk, cmd, basedev, startdev,
4098 1 /* format */, first_offs + 1,
4099 trkcount, blksize,
4100 tlf) == -EAGAIN) {
4101 /* Clock not in sync and XRC is enabled.
4102 * Try again later.
4103 */
4104 dasd_sfree_request(cqr, startdev);
4105 return ERR_PTR(-EAGAIN);
4106 }
4107
4108 /*
4109 * The translation of request into ccw programs must meet the
4110 * following conditions:
4111 * - all idaws but the first and the last must address full pages
4112 * (or 2K blocks on 31-bit)
4113 * - the scope of a ccw and it's idal ends with the track boundaries
4114 */
4115 idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
4116 recid = first_rec;
4117 new_track = 1;
4118 end_idaw = 0;
4119 len_to_track_end = 0;
4120 idaw_dst = NULL;
4121 idaw_len = 0;
4122 rq_for_each_segment(bv, req, iter) {
4123 dst = page_address(bv.bv_page) + bv.bv_offset;
4124 seg_len = bv.bv_len;
4125 while (seg_len) {
4126 if (new_track) {
4127 trkid = recid;
4128 recoffs = sector_div(trkid, blk_per_trk);
4129 count_to_trk_end = blk_per_trk - recoffs;
4130 count = min((last_rec - recid + 1),
4131 (sector_t)count_to_trk_end);
4132 len_to_track_end = count * blksize;
4133 ccw[-1].flags |= CCW_FLAG_CC;
4134 ccw->cmd_code = cmd;
4135 ccw->count = len_to_track_end;
4136 ccw->cda = (__u32)(addr_t)idaws;
4137 ccw->flags = CCW_FLAG_IDA;
4138 ccw++;
4139 recid += count;
4140 new_track = 0;
4141 /* first idaw for a ccw may start anywhere */
4142 if (!idaw_dst)
4143 idaw_dst = dst;
4144 }
4145 /* If we start a new idaw, we must make sure that it
4146 * starts on an IDA_BLOCK_SIZE boundary.
4147 * If we continue an idaw, we must make sure that the
4148 * current segment begins where the so far accumulated
4149 * idaw ends
4150 */
4151 if (!idaw_dst) {
4152 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
4153 dasd_sfree_request(cqr, startdev);
4154 return ERR_PTR(-ERANGE);
4155 } else
4156 idaw_dst = dst;
4157 }
4158 if ((idaw_dst + idaw_len) != dst) {
4159 dasd_sfree_request(cqr, startdev);
4160 return ERR_PTR(-ERANGE);
4161 }
4162 part_len = min(seg_len, len_to_track_end);
4163 seg_len -= part_len;
4164 dst += part_len;
4165 idaw_len += part_len;
4166 len_to_track_end -= part_len;
4167 /* collected memory area ends on an IDA_BLOCK border,
4168 * -> create an idaw
4169 * idal_create_words will handle cases where idaw_len
4170 * is larger then IDA_BLOCK_SIZE
4171 */
4172 if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
4173 end_idaw = 1;
4174 /* We also need to end the idaw at track end */
4175 if (!len_to_track_end) {
4176 new_track = 1;
4177 end_idaw = 1;
4178 }
4179 if (end_idaw) {
4180 idaws = idal_create_words(idaws, idaw_dst,
4181 idaw_len);
4182 idaw_dst = NULL;
4183 idaw_len = 0;
4184 end_idaw = 0;
4185 }
4186 }
4187 }
4188
4189 if (blk_noretry_request(req) ||
4190 block->base->features & DASD_FEATURE_FAILFAST)
4191 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4192 cqr->startdev = startdev;
4193 cqr->memdev = startdev;
4194 cqr->block = block;
4195 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
4196 cqr->lpm = dasd_path_get_ppm(startdev);
4197 cqr->retries = startdev->default_retries;
4198 cqr->buildclk = get_tod_clock();
4199 cqr->status = DASD_CQR_FILLED;
4200
4201 /* Set flags to suppress output for expected errors */
4202 if (dasd_eckd_is_ese(basedev))
4203 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4204
4205 return cqr;
4206 }
4207
prepare_itcw(struct itcw * itcw,unsigned int trk,unsigned int totrk,int cmd,struct dasd_device * basedev,struct dasd_device * startdev,unsigned int rec_on_trk,int count,unsigned int blksize,unsigned int total_data_size,unsigned int tlf,unsigned int blk_per_trk)4208 static int prepare_itcw(struct itcw *itcw,
4209 unsigned int trk, unsigned int totrk, int cmd,
4210 struct dasd_device *basedev,
4211 struct dasd_device *startdev,
4212 unsigned int rec_on_trk, int count,
4213 unsigned int blksize,
4214 unsigned int total_data_size,
4215 unsigned int tlf,
4216 unsigned int blk_per_trk)
4217 {
4218 struct PFX_eckd_data pfxdata;
4219 struct dasd_eckd_private *basepriv, *startpriv;
4220 struct DE_eckd_data *dedata;
4221 struct LRE_eckd_data *lredata;
4222 struct dcw *dcw;
4223
4224 u32 begcyl, endcyl;
4225 u16 heads, beghead, endhead;
4226 u8 pfx_cmd;
4227
4228 int rc = 0;
4229 int sector = 0;
4230 int dn, d;
4231
4232
4233 /* setup prefix data */
4234 basepriv = basedev->private;
4235 startpriv = startdev->private;
4236 dedata = &pfxdata.define_extent;
4237 lredata = &pfxdata.locate_record;
4238
4239 memset(&pfxdata, 0, sizeof(pfxdata));
4240 pfxdata.format = 1; /* PFX with LRE */
4241 pfxdata.base_address = basepriv->ned->unit_addr;
4242 pfxdata.base_lss = basepriv->ned->ID;
4243 pfxdata.validity.define_extent = 1;
4244
4245 /* private uid is kept up to date, conf_data may be outdated */
4246 if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
4247 pfxdata.validity.verify_base = 1;
4248
4249 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
4250 pfxdata.validity.verify_base = 1;
4251 pfxdata.validity.hyper_pav = 1;
4252 }
4253
4254 switch (cmd) {
4255 case DASD_ECKD_CCW_READ_TRACK_DATA:
4256 dedata->mask.perm = 0x1;
4257 dedata->attributes.operation = basepriv->attrib.operation;
4258 dedata->blk_size = blksize;
4259 dedata->ga_extended |= 0x42;
4260 lredata->operation.orientation = 0x0;
4261 lredata->operation.operation = 0x0C;
4262 lredata->auxiliary.check_bytes = 0x01;
4263 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
4264 break;
4265 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
4266 dedata->mask.perm = 0x02;
4267 dedata->attributes.operation = basepriv->attrib.operation;
4268 dedata->blk_size = blksize;
4269 rc = set_timestamp(NULL, dedata, basedev);
4270 dedata->ga_extended |= 0x42;
4271 lredata->operation.orientation = 0x0;
4272 lredata->operation.operation = 0x3F;
4273 lredata->extended_operation = 0x23;
4274 lredata->auxiliary.check_bytes = 0x2;
4275 /*
4276 * If XRC is supported the System Time Stamp is set. The
4277 * validity of the time stamp must be reflected in the prefix
4278 * data as well.
4279 */
4280 if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
4281 pfxdata.validity.time_stamp = 1; /* 'Time Stamp Valid' */
4282 pfx_cmd = DASD_ECKD_CCW_PFX;
4283 break;
4284 case DASD_ECKD_CCW_READ_COUNT_MT:
4285 dedata->mask.perm = 0x1;
4286 dedata->attributes.operation = DASD_BYPASS_CACHE;
4287 dedata->ga_extended |= 0x42;
4288 dedata->blk_size = blksize;
4289 lredata->operation.orientation = 0x2;
4290 lredata->operation.operation = 0x16;
4291 lredata->auxiliary.check_bytes = 0x01;
4292 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
4293 break;
4294 default:
4295 DBF_DEV_EVENT(DBF_ERR, basedev,
4296 "prepare itcw, unknown opcode 0x%x", cmd);
4297 BUG();
4298 break;
4299 }
4300 if (rc)
4301 return rc;
4302
4303 dedata->attributes.mode = 0x3; /* ECKD */
4304
4305 heads = basepriv->rdc_data.trk_per_cyl;
4306 begcyl = trk / heads;
4307 beghead = trk % heads;
4308 endcyl = totrk / heads;
4309 endhead = totrk % heads;
4310
4311 /* check for sequential prestage - enhance cylinder range */
4312 if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
4313 dedata->attributes.operation == DASD_SEQ_ACCESS) {
4314
4315 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
4316 endcyl += basepriv->attrib.nr_cyl;
4317 else
4318 endcyl = (basepriv->real_cyl - 1);
4319 }
4320
4321 set_ch_t(&dedata->beg_ext, begcyl, beghead);
4322 set_ch_t(&dedata->end_ext, endcyl, endhead);
4323
4324 dedata->ep_format = 0x20; /* records per track is valid */
4325 dedata->ep_rec_per_track = blk_per_trk;
4326
4327 if (rec_on_trk) {
4328 switch (basepriv->rdc_data.dev_type) {
4329 case 0x3390:
4330 dn = ceil_quot(blksize + 6, 232);
4331 d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
4332 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
4333 break;
4334 case 0x3380:
4335 d = 7 + ceil_quot(blksize + 12, 32);
4336 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
4337 break;
4338 }
4339 }
4340
4341 if (cmd == DASD_ECKD_CCW_READ_COUNT_MT) {
4342 lredata->auxiliary.length_valid = 0;
4343 lredata->auxiliary.length_scope = 0;
4344 lredata->sector = 0xff;
4345 } else {
4346 lredata->auxiliary.length_valid = 1;
4347 lredata->auxiliary.length_scope = 1;
4348 lredata->sector = sector;
4349 }
4350 lredata->auxiliary.imbedded_ccw_valid = 1;
4351 lredata->length = tlf;
4352 lredata->imbedded_ccw = cmd;
4353 lredata->count = count;
4354 set_ch_t(&lredata->seek_addr, begcyl, beghead);
4355 lredata->search_arg.cyl = lredata->seek_addr.cyl;
4356 lredata->search_arg.head = lredata->seek_addr.head;
4357 lredata->search_arg.record = rec_on_trk;
4358
4359 dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
4360 &pfxdata, sizeof(pfxdata), total_data_size);
4361 return PTR_ERR_OR_ZERO(dcw);
4362 }
4363
dasd_eckd_build_cp_tpm_track(struct dasd_device * startdev,struct dasd_block * block,struct request * req,sector_t first_rec,sector_t last_rec,sector_t first_trk,sector_t last_trk,unsigned int first_offs,unsigned int last_offs,unsigned int blk_per_trk,unsigned int blksize)4364 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
4365 struct dasd_device *startdev,
4366 struct dasd_block *block,
4367 struct request *req,
4368 sector_t first_rec,
4369 sector_t last_rec,
4370 sector_t first_trk,
4371 sector_t last_trk,
4372 unsigned int first_offs,
4373 unsigned int last_offs,
4374 unsigned int blk_per_trk,
4375 unsigned int blksize)
4376 {
4377 struct dasd_ccw_req *cqr;
4378 struct req_iterator iter;
4379 struct bio_vec bv;
4380 char *dst;
4381 unsigned int trkcount, ctidaw;
4382 unsigned char cmd;
4383 struct dasd_device *basedev;
4384 unsigned int tlf;
4385 struct itcw *itcw;
4386 struct tidaw *last_tidaw = NULL;
4387 int itcw_op;
4388 size_t itcw_size;
4389 u8 tidaw_flags;
4390 unsigned int seg_len, part_len, len_to_track_end;
4391 unsigned char new_track;
4392 sector_t recid, trkid;
4393 unsigned int offs;
4394 unsigned int count, count_to_trk_end;
4395 int ret;
4396
4397 basedev = block->base;
4398 if (rq_data_dir(req) == READ) {
4399 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
4400 itcw_op = ITCW_OP_READ;
4401 } else if (rq_data_dir(req) == WRITE) {
4402 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
4403 itcw_op = ITCW_OP_WRITE;
4404 } else
4405 return ERR_PTR(-EINVAL);
4406
4407 /* trackbased I/O needs address all memory via TIDAWs,
4408 * not just for 64 bit addresses. This allows us to map
4409 * each segment directly to one tidaw.
4410 * In the case of write requests, additional tidaws may
4411 * be needed when a segment crosses a track boundary.
4412 */
4413 trkcount = last_trk - first_trk + 1;
4414 ctidaw = 0;
4415 rq_for_each_segment(bv, req, iter) {
4416 ++ctidaw;
4417 }
4418 if (rq_data_dir(req) == WRITE)
4419 ctidaw += (last_trk - first_trk);
4420
4421 /* Allocate the ccw request. */
4422 itcw_size = itcw_calc_size(0, ctidaw, 0);
4423 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev,
4424 blk_mq_rq_to_pdu(req));
4425 if (IS_ERR(cqr))
4426 return cqr;
4427
4428 /* transfer length factor: how many bytes to read from the last track */
4429 if (first_trk == last_trk)
4430 tlf = last_offs - first_offs + 1;
4431 else
4432 tlf = last_offs + 1;
4433 tlf *= blksize;
4434
4435 itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
4436 if (IS_ERR(itcw)) {
4437 ret = -EINVAL;
4438 goto out_error;
4439 }
4440 cqr->cpaddr = itcw_get_tcw(itcw);
4441 if (prepare_itcw(itcw, first_trk, last_trk,
4442 cmd, basedev, startdev,
4443 first_offs + 1,
4444 trkcount, blksize,
4445 (last_rec - first_rec + 1) * blksize,
4446 tlf, blk_per_trk) == -EAGAIN) {
4447 /* Clock not in sync and XRC is enabled.
4448 * Try again later.
4449 */
4450 ret = -EAGAIN;
4451 goto out_error;
4452 }
4453 len_to_track_end = 0;
4454 /*
4455 * A tidaw can address 4k of memory, but must not cross page boundaries
4456 * We can let the block layer handle this by setting
4457 * blk_queue_segment_boundary to page boundaries and
4458 * blk_max_segment_size to page size when setting up the request queue.
4459 * For write requests, a TIDAW must not cross track boundaries, because
4460 * we have to set the CBC flag on the last tidaw for each track.
4461 */
4462 if (rq_data_dir(req) == WRITE) {
4463 new_track = 1;
4464 recid = first_rec;
4465 rq_for_each_segment(bv, req, iter) {
4466 dst = page_address(bv.bv_page) + bv.bv_offset;
4467 seg_len = bv.bv_len;
4468 while (seg_len) {
4469 if (new_track) {
4470 trkid = recid;
4471 offs = sector_div(trkid, blk_per_trk);
4472 count_to_trk_end = blk_per_trk - offs;
4473 count = min((last_rec - recid + 1),
4474 (sector_t)count_to_trk_end);
4475 len_to_track_end = count * blksize;
4476 recid += count;
4477 new_track = 0;
4478 }
4479 part_len = min(seg_len, len_to_track_end);
4480 seg_len -= part_len;
4481 len_to_track_end -= part_len;
4482 /* We need to end the tidaw at track end */
4483 if (!len_to_track_end) {
4484 new_track = 1;
4485 tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
4486 } else
4487 tidaw_flags = 0;
4488 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
4489 dst, part_len);
4490 if (IS_ERR(last_tidaw)) {
4491 ret = -EINVAL;
4492 goto out_error;
4493 }
4494 dst += part_len;
4495 }
4496 }
4497 } else {
4498 rq_for_each_segment(bv, req, iter) {
4499 dst = page_address(bv.bv_page) + bv.bv_offset;
4500 last_tidaw = itcw_add_tidaw(itcw, 0x00,
4501 dst, bv.bv_len);
4502 if (IS_ERR(last_tidaw)) {
4503 ret = -EINVAL;
4504 goto out_error;
4505 }
4506 }
4507 }
4508 last_tidaw->flags |= TIDAW_FLAGS_LAST;
4509 last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
4510 itcw_finalize(itcw);
4511
4512 if (blk_noretry_request(req) ||
4513 block->base->features & DASD_FEATURE_FAILFAST)
4514 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4515 cqr->cpmode = 1;
4516 cqr->startdev = startdev;
4517 cqr->memdev = startdev;
4518 cqr->block = block;
4519 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
4520 cqr->lpm = dasd_path_get_ppm(startdev);
4521 cqr->retries = startdev->default_retries;
4522 cqr->buildclk = get_tod_clock();
4523 cqr->status = DASD_CQR_FILLED;
4524
4525 /* Set flags to suppress output for expected errors */
4526 if (dasd_eckd_is_ese(basedev)) {
4527 set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
4528 set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
4529 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4530 }
4531
4532 return cqr;
4533 out_error:
4534 dasd_sfree_request(cqr, startdev);
4535 return ERR_PTR(ret);
4536 }
4537
dasd_eckd_build_cp(struct dasd_device * startdev,struct dasd_block * block,struct request * req)4538 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
4539 struct dasd_block *block,
4540 struct request *req)
4541 {
4542 int cmdrtd, cmdwtd;
4543 int use_prefix;
4544 int fcx_multitrack;
4545 struct dasd_eckd_private *private;
4546 struct dasd_device *basedev;
4547 sector_t first_rec, last_rec;
4548 sector_t first_trk, last_trk;
4549 unsigned int first_offs, last_offs;
4550 unsigned int blk_per_trk, blksize;
4551 int cdlspecial;
4552 unsigned int data_size;
4553 struct dasd_ccw_req *cqr;
4554
4555 basedev = block->base;
4556 private = basedev->private;
4557
4558 /* Calculate number of blocks/records per track. */
4559 blksize = block->bp_block;
4560 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
4561 if (blk_per_trk == 0)
4562 return ERR_PTR(-EINVAL);
4563 /* Calculate record id of first and last block. */
4564 first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
4565 first_offs = sector_div(first_trk, blk_per_trk);
4566 last_rec = last_trk =
4567 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
4568 last_offs = sector_div(last_trk, blk_per_trk);
4569 cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
4570
4571 fcx_multitrack = private->features.feature[40] & 0x20;
4572 data_size = blk_rq_bytes(req);
4573 if (data_size % blksize)
4574 return ERR_PTR(-EINVAL);
4575 /* tpm write request add CBC data on each track boundary */
4576 if (rq_data_dir(req) == WRITE)
4577 data_size += (last_trk - first_trk) * 4;
4578
4579 /* is read track data and write track data in command mode supported? */
4580 cmdrtd = private->features.feature[9] & 0x20;
4581 cmdwtd = private->features.feature[12] & 0x40;
4582 use_prefix = private->features.feature[8] & 0x01;
4583
4584 cqr = NULL;
4585 if (cdlspecial || dasd_page_cache) {
4586 /* do nothing, just fall through to the cmd mode single case */
4587 } else if ((data_size <= private->fcx_max_data)
4588 && (fcx_multitrack || (first_trk == last_trk))) {
4589 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
4590 first_rec, last_rec,
4591 first_trk, last_trk,
4592 first_offs, last_offs,
4593 blk_per_trk, blksize);
4594 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
4595 (PTR_ERR(cqr) != -ENOMEM))
4596 cqr = NULL;
4597 } else if (use_prefix &&
4598 (((rq_data_dir(req) == READ) && cmdrtd) ||
4599 ((rq_data_dir(req) == WRITE) && cmdwtd))) {
4600 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
4601 first_rec, last_rec,
4602 first_trk, last_trk,
4603 first_offs, last_offs,
4604 blk_per_trk, blksize);
4605 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
4606 (PTR_ERR(cqr) != -ENOMEM))
4607 cqr = NULL;
4608 }
4609 if (!cqr)
4610 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
4611 first_rec, last_rec,
4612 first_trk, last_trk,
4613 first_offs, last_offs,
4614 blk_per_trk, blksize);
4615 return cqr;
4616 }
4617
dasd_eckd_build_cp_raw(struct dasd_device * startdev,struct dasd_block * block,struct request * req)4618 static struct dasd_ccw_req *dasd_eckd_build_cp_raw(struct dasd_device *startdev,
4619 struct dasd_block *block,
4620 struct request *req)
4621 {
4622 sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
4623 unsigned int seg_len, len_to_track_end;
4624 unsigned int cidaw, cplength, datasize;
4625 sector_t first_trk, last_trk, sectors;
4626 struct dasd_eckd_private *base_priv;
4627 struct dasd_device *basedev;
4628 struct req_iterator iter;
4629 struct dasd_ccw_req *cqr;
4630 unsigned int trkcount;
4631 unsigned long *idaws;
4632 unsigned int size;
4633 unsigned char cmd;
4634 struct bio_vec bv;
4635 struct ccw1 *ccw;
4636 int use_prefix;
4637 void *data;
4638 char *dst;
4639
4640 /*
4641 * raw track access needs to be mutiple of 64k and on 64k boundary
4642 * For read requests we can fix an incorrect alignment by padding
4643 * the request with dummy pages.
4644 */
4645 start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
4646 end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
4647 DASD_RAW_SECTORS_PER_TRACK;
4648 end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
4649 DASD_RAW_SECTORS_PER_TRACK;
4650 basedev = block->base;
4651 if ((start_padding_sectors || end_padding_sectors) &&
4652 (rq_data_dir(req) == WRITE)) {
4653 DBF_DEV_EVENT(DBF_ERR, basedev,
4654 "raw write not track aligned (%llu,%llu) req %p",
4655 start_padding_sectors, end_padding_sectors, req);
4656 return ERR_PTR(-EINVAL);
4657 }
4658
4659 first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
4660 last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
4661 DASD_RAW_SECTORS_PER_TRACK;
4662 trkcount = last_trk - first_trk + 1;
4663
4664 if (rq_data_dir(req) == READ)
4665 cmd = DASD_ECKD_CCW_READ_TRACK;
4666 else if (rq_data_dir(req) == WRITE)
4667 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
4668 else
4669 return ERR_PTR(-EINVAL);
4670
4671 /*
4672 * Raw track based I/O needs IDAWs for each page,
4673 * and not just for 64 bit addresses.
4674 */
4675 cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
4676
4677 /*
4678 * struct PFX_eckd_data and struct LRE_eckd_data can have up to 2 bytes
4679 * of extended parameter. This is needed for write full track.
4680 */
4681 base_priv = basedev->private;
4682 use_prefix = base_priv->features.feature[8] & 0x01;
4683 if (use_prefix) {
4684 cplength = 1 + trkcount;
4685 size = sizeof(struct PFX_eckd_data) + 2;
4686 } else {
4687 cplength = 2 + trkcount;
4688 size = sizeof(struct DE_eckd_data) +
4689 sizeof(struct LRE_eckd_data) + 2;
4690 }
4691 size = ALIGN(size, 8);
4692
4693 datasize = size + cidaw * sizeof(unsigned long);
4694
4695 /* Allocate the ccw request. */
4696 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
4697 datasize, startdev, blk_mq_rq_to_pdu(req));
4698 if (IS_ERR(cqr))
4699 return cqr;
4700
4701 ccw = cqr->cpaddr;
4702 data = cqr->data;
4703
4704 if (use_prefix) {
4705 prefix_LRE(ccw++, data, first_trk, last_trk, cmd, basedev,
4706 startdev, 1, 0, trkcount, 0, 0);
4707 } else {
4708 define_extent(ccw++, data, first_trk, last_trk, cmd, basedev, 0);
4709 ccw[-1].flags |= CCW_FLAG_CC;
4710
4711 data += sizeof(struct DE_eckd_data);
4712 locate_record_ext(ccw++, data, first_trk, 0,
4713 trkcount, cmd, basedev, 0, 0);
4714 }
4715
4716 idaws = (unsigned long *)(cqr->data + size);
4717 len_to_track_end = 0;
4718 if (start_padding_sectors) {
4719 ccw[-1].flags |= CCW_FLAG_CC;
4720 ccw->cmd_code = cmd;
4721 /* maximum 3390 track size */
4722 ccw->count = 57326;
4723 /* 64k map to one track */
4724 len_to_track_end = 65536 - start_padding_sectors * 512;
4725 ccw->cda = (__u32)(addr_t)idaws;
4726 ccw->flags |= CCW_FLAG_IDA;
4727 ccw->flags |= CCW_FLAG_SLI;
4728 ccw++;
4729 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
4730 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
4731 }
4732 rq_for_each_segment(bv, req, iter) {
4733 dst = page_address(bv.bv_page) + bv.bv_offset;
4734 seg_len = bv.bv_len;
4735 if (cmd == DASD_ECKD_CCW_READ_TRACK)
4736 memset(dst, 0, seg_len);
4737 if (!len_to_track_end) {
4738 ccw[-1].flags |= CCW_FLAG_CC;
4739 ccw->cmd_code = cmd;
4740 /* maximum 3390 track size */
4741 ccw->count = 57326;
4742 /* 64k map to one track */
4743 len_to_track_end = 65536;
4744 ccw->cda = (__u32)(addr_t)idaws;
4745 ccw->flags |= CCW_FLAG_IDA;
4746 ccw->flags |= CCW_FLAG_SLI;
4747 ccw++;
4748 }
4749 len_to_track_end -= seg_len;
4750 idaws = idal_create_words(idaws, dst, seg_len);
4751 }
4752 for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
4753 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
4754 if (blk_noretry_request(req) ||
4755 block->base->features & DASD_FEATURE_FAILFAST)
4756 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4757 cqr->startdev = startdev;
4758 cqr->memdev = startdev;
4759 cqr->block = block;
4760 cqr->expires = startdev->default_expires * HZ;
4761 cqr->lpm = dasd_path_get_ppm(startdev);
4762 cqr->retries = startdev->default_retries;
4763 cqr->buildclk = get_tod_clock();
4764 cqr->status = DASD_CQR_FILLED;
4765
4766 return cqr;
4767 }
4768
4769
4770 static int
dasd_eckd_free_cp(struct dasd_ccw_req * cqr,struct request * req)4771 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
4772 {
4773 struct dasd_eckd_private *private;
4774 struct ccw1 *ccw;
4775 struct req_iterator iter;
4776 struct bio_vec bv;
4777 char *dst, *cda;
4778 unsigned int blksize, blk_per_trk, off;
4779 sector_t recid;
4780 int status;
4781
4782 if (!dasd_page_cache)
4783 goto out;
4784 private = cqr->block->base->private;
4785 blksize = cqr->block->bp_block;
4786 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
4787 recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
4788 ccw = cqr->cpaddr;
4789 /* Skip over define extent & locate record. */
4790 ccw++;
4791 if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
4792 ccw++;
4793 rq_for_each_segment(bv, req, iter) {
4794 dst = page_address(bv.bv_page) + bv.bv_offset;
4795 for (off = 0; off < bv.bv_len; off += blksize) {
4796 /* Skip locate record. */
4797 if (private->uses_cdl && recid <= 2*blk_per_trk)
4798 ccw++;
4799 if (dst) {
4800 if (ccw->flags & CCW_FLAG_IDA)
4801 cda = *((char **)((addr_t) ccw->cda));
4802 else
4803 cda = (char *)((addr_t) ccw->cda);
4804 if (dst != cda) {
4805 if (rq_data_dir(req) == READ)
4806 memcpy(dst, cda, bv.bv_len);
4807 kmem_cache_free(dasd_page_cache,
4808 (void *)((addr_t)cda & PAGE_MASK));
4809 }
4810 dst = NULL;
4811 }
4812 ccw++;
4813 recid++;
4814 }
4815 }
4816 out:
4817 status = cqr->status == DASD_CQR_DONE;
4818 dasd_sfree_request(cqr, cqr->memdev);
4819 return status;
4820 }
4821
4822 /*
4823 * Modify ccw/tcw in cqr so it can be started on a base device.
4824 *
4825 * Note that this is not enough to restart the cqr!
4826 * Either reset cqr->startdev as well (summary unit check handling)
4827 * or restart via separate cqr (as in ERP handling).
4828 */
dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req * cqr)4829 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
4830 {
4831 struct ccw1 *ccw;
4832 struct PFX_eckd_data *pfxdata;
4833 struct tcw *tcw;
4834 struct tccb *tccb;
4835 struct dcw *dcw;
4836
4837 if (cqr->cpmode == 1) {
4838 tcw = cqr->cpaddr;
4839 tccb = tcw_get_tccb(tcw);
4840 dcw = (struct dcw *)&tccb->tca[0];
4841 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
4842 pfxdata->validity.verify_base = 0;
4843 pfxdata->validity.hyper_pav = 0;
4844 } else {
4845 ccw = cqr->cpaddr;
4846 pfxdata = cqr->data;
4847 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
4848 pfxdata->validity.verify_base = 0;
4849 pfxdata->validity.hyper_pav = 0;
4850 }
4851 }
4852 }
4853
4854 #define DASD_ECKD_CHANQ_MAX_SIZE 4
4855
dasd_eckd_build_alias_cp(struct dasd_device * base,struct dasd_block * block,struct request * req)4856 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
4857 struct dasd_block *block,
4858 struct request *req)
4859 {
4860 struct dasd_eckd_private *private;
4861 struct dasd_device *startdev;
4862 unsigned long flags;
4863 struct dasd_ccw_req *cqr;
4864
4865 startdev = dasd_alias_get_start_dev(base);
4866 if (!startdev)
4867 startdev = base;
4868 private = startdev->private;
4869 if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
4870 return ERR_PTR(-EBUSY);
4871
4872 spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
4873 private->count++;
4874 if ((base->features & DASD_FEATURE_USERAW))
4875 cqr = dasd_eckd_build_cp_raw(startdev, block, req);
4876 else
4877 cqr = dasd_eckd_build_cp(startdev, block, req);
4878 if (IS_ERR(cqr))
4879 private->count--;
4880 spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
4881 return cqr;
4882 }
4883
dasd_eckd_free_alias_cp(struct dasd_ccw_req * cqr,struct request * req)4884 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
4885 struct request *req)
4886 {
4887 struct dasd_eckd_private *private;
4888 unsigned long flags;
4889
4890 spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
4891 private = cqr->memdev->private;
4892 private->count--;
4893 spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
4894 return dasd_eckd_free_cp(cqr, req);
4895 }
4896
4897 static int
dasd_eckd_fill_info(struct dasd_device * device,struct dasd_information2_t * info)4898 dasd_eckd_fill_info(struct dasd_device * device,
4899 struct dasd_information2_t * info)
4900 {
4901 struct dasd_eckd_private *private = device->private;
4902
4903 info->label_block = 2;
4904 info->FBA_layout = private->uses_cdl ? 0 : 1;
4905 info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
4906 info->characteristics_size = sizeof(private->rdc_data);
4907 memcpy(info->characteristics, &private->rdc_data,
4908 sizeof(private->rdc_data));
4909 info->confdata_size = min((unsigned long)private->conf_len,
4910 sizeof(info->configuration_data));
4911 memcpy(info->configuration_data, private->conf_data,
4912 info->confdata_size);
4913 return 0;
4914 }
4915
4916 /*
4917 * SECTION: ioctl functions for eckd devices.
4918 */
4919
4920 /*
4921 * Release device ioctl.
4922 * Buils a channel programm to releases a prior reserved
4923 * (see dasd_eckd_reserve) device.
4924 */
4925 static int
dasd_eckd_release(struct dasd_device * device)4926 dasd_eckd_release(struct dasd_device *device)
4927 {
4928 struct dasd_ccw_req *cqr;
4929 int rc;
4930 struct ccw1 *ccw;
4931 int useglobal;
4932
4933 if (!capable(CAP_SYS_ADMIN))
4934 return -EACCES;
4935
4936 useglobal = 0;
4937 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
4938 if (IS_ERR(cqr)) {
4939 mutex_lock(&dasd_reserve_mutex);
4940 useglobal = 1;
4941 cqr = &dasd_reserve_req->cqr;
4942 memset(cqr, 0, sizeof(*cqr));
4943 memset(&dasd_reserve_req->ccw, 0,
4944 sizeof(dasd_reserve_req->ccw));
4945 cqr->cpaddr = &dasd_reserve_req->ccw;
4946 cqr->data = &dasd_reserve_req->data;
4947 cqr->magic = DASD_ECKD_MAGIC;
4948 }
4949 ccw = cqr->cpaddr;
4950 ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
4951 ccw->flags |= CCW_FLAG_SLI;
4952 ccw->count = 32;
4953 ccw->cda = (__u32)(addr_t) cqr->data;
4954 cqr->startdev = device;
4955 cqr->memdev = device;
4956 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4957 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4958 cqr->retries = 2; /* set retry counter to enable basic ERP */
4959 cqr->expires = 2 * HZ;
4960 cqr->buildclk = get_tod_clock();
4961 cqr->status = DASD_CQR_FILLED;
4962
4963 rc = dasd_sleep_on_immediatly(cqr);
4964 if (!rc)
4965 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4966
4967 if (useglobal)
4968 mutex_unlock(&dasd_reserve_mutex);
4969 else
4970 dasd_sfree_request(cqr, cqr->memdev);
4971 return rc;
4972 }
4973
4974 /*
4975 * Reserve device ioctl.
4976 * Options are set to 'synchronous wait for interrupt' and
4977 * 'timeout the request'. This leads to a terminate IO if
4978 * the interrupt is outstanding for a certain time.
4979 */
4980 static int
dasd_eckd_reserve(struct dasd_device * device)4981 dasd_eckd_reserve(struct dasd_device *device)
4982 {
4983 struct dasd_ccw_req *cqr;
4984 int rc;
4985 struct ccw1 *ccw;
4986 int useglobal;
4987
4988 if (!capable(CAP_SYS_ADMIN))
4989 return -EACCES;
4990
4991 useglobal = 0;
4992 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
4993 if (IS_ERR(cqr)) {
4994 mutex_lock(&dasd_reserve_mutex);
4995 useglobal = 1;
4996 cqr = &dasd_reserve_req->cqr;
4997 memset(cqr, 0, sizeof(*cqr));
4998 memset(&dasd_reserve_req->ccw, 0,
4999 sizeof(dasd_reserve_req->ccw));
5000 cqr->cpaddr = &dasd_reserve_req->ccw;
5001 cqr->data = &dasd_reserve_req->data;
5002 cqr->magic = DASD_ECKD_MAGIC;
5003 }
5004 ccw = cqr->cpaddr;
5005 ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
5006 ccw->flags |= CCW_FLAG_SLI;
5007 ccw->count = 32;
5008 ccw->cda = (__u32)(addr_t) cqr->data;
5009 cqr->startdev = device;
5010 cqr->memdev = device;
5011 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5012 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5013 cqr->retries = 2; /* set retry counter to enable basic ERP */
5014 cqr->expires = 2 * HZ;
5015 cqr->buildclk = get_tod_clock();
5016 cqr->status = DASD_CQR_FILLED;
5017
5018 rc = dasd_sleep_on_immediatly(cqr);
5019 if (!rc)
5020 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5021
5022 if (useglobal)
5023 mutex_unlock(&dasd_reserve_mutex);
5024 else
5025 dasd_sfree_request(cqr, cqr->memdev);
5026 return rc;
5027 }
5028
5029 /*
5030 * Steal lock ioctl - unconditional reserve device.
5031 * Buils a channel programm to break a device's reservation.
5032 * (unconditional reserve)
5033 */
5034 static int
dasd_eckd_steal_lock(struct dasd_device * device)5035 dasd_eckd_steal_lock(struct dasd_device *device)
5036 {
5037 struct dasd_ccw_req *cqr;
5038 int rc;
5039 struct ccw1 *ccw;
5040 int useglobal;
5041
5042 if (!capable(CAP_SYS_ADMIN))
5043 return -EACCES;
5044
5045 useglobal = 0;
5046 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
5047 if (IS_ERR(cqr)) {
5048 mutex_lock(&dasd_reserve_mutex);
5049 useglobal = 1;
5050 cqr = &dasd_reserve_req->cqr;
5051 memset(cqr, 0, sizeof(*cqr));
5052 memset(&dasd_reserve_req->ccw, 0,
5053 sizeof(dasd_reserve_req->ccw));
5054 cqr->cpaddr = &dasd_reserve_req->ccw;
5055 cqr->data = &dasd_reserve_req->data;
5056 cqr->magic = DASD_ECKD_MAGIC;
5057 }
5058 ccw = cqr->cpaddr;
5059 ccw->cmd_code = DASD_ECKD_CCW_SLCK;
5060 ccw->flags |= CCW_FLAG_SLI;
5061 ccw->count = 32;
5062 ccw->cda = (__u32)(addr_t) cqr->data;
5063 cqr->startdev = device;
5064 cqr->memdev = device;
5065 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5066 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5067 cqr->retries = 2; /* set retry counter to enable basic ERP */
5068 cqr->expires = 2 * HZ;
5069 cqr->buildclk = get_tod_clock();
5070 cqr->status = DASD_CQR_FILLED;
5071
5072 rc = dasd_sleep_on_immediatly(cqr);
5073 if (!rc)
5074 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5075
5076 if (useglobal)
5077 mutex_unlock(&dasd_reserve_mutex);
5078 else
5079 dasd_sfree_request(cqr, cqr->memdev);
5080 return rc;
5081 }
5082
5083 /*
5084 * SNID - Sense Path Group ID
5085 * This ioctl may be used in situations where I/O is stalled due to
5086 * a reserve, so if the normal dasd_smalloc_request fails, we use the
5087 * preallocated dasd_reserve_req.
5088 */
dasd_eckd_snid(struct dasd_device * device,void __user * argp)5089 static int dasd_eckd_snid(struct dasd_device *device,
5090 void __user *argp)
5091 {
5092 struct dasd_ccw_req *cqr;
5093 int rc;
5094 struct ccw1 *ccw;
5095 int useglobal;
5096 struct dasd_snid_ioctl_data usrparm;
5097
5098 if (!capable(CAP_SYS_ADMIN))
5099 return -EACCES;
5100
5101 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
5102 return -EFAULT;
5103
5104 useglobal = 0;
5105 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
5106 sizeof(struct dasd_snid_data), device,
5107 NULL);
5108 if (IS_ERR(cqr)) {
5109 mutex_lock(&dasd_reserve_mutex);
5110 useglobal = 1;
5111 cqr = &dasd_reserve_req->cqr;
5112 memset(cqr, 0, sizeof(*cqr));
5113 memset(&dasd_reserve_req->ccw, 0,
5114 sizeof(dasd_reserve_req->ccw));
5115 cqr->cpaddr = &dasd_reserve_req->ccw;
5116 cqr->data = &dasd_reserve_req->data;
5117 cqr->magic = DASD_ECKD_MAGIC;
5118 }
5119 ccw = cqr->cpaddr;
5120 ccw->cmd_code = DASD_ECKD_CCW_SNID;
5121 ccw->flags |= CCW_FLAG_SLI;
5122 ccw->count = 12;
5123 ccw->cda = (__u32)(addr_t) cqr->data;
5124 cqr->startdev = device;
5125 cqr->memdev = device;
5126 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5127 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5128 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
5129 cqr->retries = 5;
5130 cqr->expires = 10 * HZ;
5131 cqr->buildclk = get_tod_clock();
5132 cqr->status = DASD_CQR_FILLED;
5133 cqr->lpm = usrparm.path_mask;
5134
5135 rc = dasd_sleep_on_immediatly(cqr);
5136 /* verify that I/O processing didn't modify the path mask */
5137 if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
5138 rc = -EIO;
5139 if (!rc) {
5140 usrparm.data = *((struct dasd_snid_data *)cqr->data);
5141 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
5142 rc = -EFAULT;
5143 }
5144
5145 if (useglobal)
5146 mutex_unlock(&dasd_reserve_mutex);
5147 else
5148 dasd_sfree_request(cqr, cqr->memdev);
5149 return rc;
5150 }
5151
5152 /*
5153 * Read performance statistics
5154 */
5155 static int
dasd_eckd_performance(struct dasd_device * device,void __user * argp)5156 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
5157 {
5158 struct dasd_psf_prssd_data *prssdp;
5159 struct dasd_rssd_perf_stats_t *stats;
5160 struct dasd_ccw_req *cqr;
5161 struct ccw1 *ccw;
5162 int rc;
5163
5164 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5165 (sizeof(struct dasd_psf_prssd_data) +
5166 sizeof(struct dasd_rssd_perf_stats_t)),
5167 device, NULL);
5168 if (IS_ERR(cqr)) {
5169 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5170 "Could not allocate initialization request");
5171 return PTR_ERR(cqr);
5172 }
5173 cqr->startdev = device;
5174 cqr->memdev = device;
5175 cqr->retries = 0;
5176 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5177 cqr->expires = 10 * HZ;
5178
5179 /* Prepare for Read Subsystem Data */
5180 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5181 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5182 prssdp->order = PSF_ORDER_PRSSD;
5183 prssdp->suborder = 0x01; /* Performance Statistics */
5184 prssdp->varies[1] = 0x01; /* Perf Statistics for the Subsystem */
5185
5186 ccw = cqr->cpaddr;
5187 ccw->cmd_code = DASD_ECKD_CCW_PSF;
5188 ccw->count = sizeof(struct dasd_psf_prssd_data);
5189 ccw->flags |= CCW_FLAG_CC;
5190 ccw->cda = (__u32)(addr_t) prssdp;
5191
5192 /* Read Subsystem Data - Performance Statistics */
5193 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
5194 memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
5195
5196 ccw++;
5197 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5198 ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
5199 ccw->cda = (__u32)(addr_t) stats;
5200
5201 cqr->buildclk = get_tod_clock();
5202 cqr->status = DASD_CQR_FILLED;
5203 rc = dasd_sleep_on(cqr);
5204 if (rc == 0) {
5205 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5206 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
5207 if (copy_to_user(argp, stats,
5208 sizeof(struct dasd_rssd_perf_stats_t)))
5209 rc = -EFAULT;
5210 }
5211 dasd_sfree_request(cqr, cqr->memdev);
5212 return rc;
5213 }
5214
5215 /*
5216 * Get attributes (cache operations)
5217 * Returnes the cache attributes used in Define Extend (DE).
5218 */
5219 static int
dasd_eckd_get_attrib(struct dasd_device * device,void __user * argp)5220 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
5221 {
5222 struct dasd_eckd_private *private = device->private;
5223 struct attrib_data_t attrib = private->attrib;
5224 int rc;
5225
5226 if (!capable(CAP_SYS_ADMIN))
5227 return -EACCES;
5228 if (!argp)
5229 return -EINVAL;
5230
5231 rc = 0;
5232 if (copy_to_user(argp, (long *) &attrib,
5233 sizeof(struct attrib_data_t)))
5234 rc = -EFAULT;
5235
5236 return rc;
5237 }
5238
5239 /*
5240 * Set attributes (cache operations)
5241 * Stores the attributes for cache operation to be used in Define Extend (DE).
5242 */
5243 static int
dasd_eckd_set_attrib(struct dasd_device * device,void __user * argp)5244 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
5245 {
5246 struct dasd_eckd_private *private = device->private;
5247 struct attrib_data_t attrib;
5248
5249 if (!capable(CAP_SYS_ADMIN))
5250 return -EACCES;
5251 if (!argp)
5252 return -EINVAL;
5253
5254 if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
5255 return -EFAULT;
5256 private->attrib = attrib;
5257
5258 dev_info(&device->cdev->dev,
5259 "The DASD cache mode was set to %x (%i cylinder prestage)\n",
5260 private->attrib.operation, private->attrib.nr_cyl);
5261 return 0;
5262 }
5263
5264 /*
5265 * Issue syscall I/O to EMC Symmetrix array.
5266 * CCWs are PSF and RSSD
5267 */
dasd_symm_io(struct dasd_device * device,void __user * argp)5268 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
5269 {
5270 struct dasd_symmio_parms usrparm;
5271 char *psf_data, *rssd_result;
5272 struct dasd_ccw_req *cqr;
5273 struct ccw1 *ccw;
5274 char psf0, psf1;
5275 int rc;
5276
5277 if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
5278 return -EACCES;
5279 psf0 = psf1 = 0;
5280
5281 /* Copy parms from caller */
5282 rc = -EFAULT;
5283 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
5284 goto out;
5285 if (is_compat_task()) {
5286 /* Make sure pointers are sane even on 31 bit. */
5287 rc = -EINVAL;
5288 if ((usrparm.psf_data >> 32) != 0)
5289 goto out;
5290 if ((usrparm.rssd_result >> 32) != 0)
5291 goto out;
5292 usrparm.psf_data &= 0x7fffffffULL;
5293 usrparm.rssd_result &= 0x7fffffffULL;
5294 }
5295 /* at least 2 bytes are accessed and should be allocated */
5296 if (usrparm.psf_data_len < 2) {
5297 DBF_DEV_EVENT(DBF_WARNING, device,
5298 "Symmetrix ioctl invalid data length %d",
5299 usrparm.psf_data_len);
5300 rc = -EINVAL;
5301 goto out;
5302 }
5303 /* alloc I/O data area */
5304 psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
5305 rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
5306 if (!psf_data || !rssd_result) {
5307 rc = -ENOMEM;
5308 goto out_free;
5309 }
5310
5311 /* get syscall header from user space */
5312 rc = -EFAULT;
5313 if (copy_from_user(psf_data,
5314 (void __user *)(unsigned long) usrparm.psf_data,
5315 usrparm.psf_data_len))
5316 goto out_free;
5317 psf0 = psf_data[0];
5318 psf1 = psf_data[1];
5319
5320 /* setup CCWs for PSF + RSSD */
5321 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2, 0, device, NULL);
5322 if (IS_ERR(cqr)) {
5323 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5324 "Could not allocate initialization request");
5325 rc = PTR_ERR(cqr);
5326 goto out_free;
5327 }
5328
5329 cqr->startdev = device;
5330 cqr->memdev = device;
5331 cqr->retries = 3;
5332 cqr->expires = 10 * HZ;
5333 cqr->buildclk = get_tod_clock();
5334 cqr->status = DASD_CQR_FILLED;
5335
5336 /* Build the ccws */
5337 ccw = cqr->cpaddr;
5338
5339 /* PSF ccw */
5340 ccw->cmd_code = DASD_ECKD_CCW_PSF;
5341 ccw->count = usrparm.psf_data_len;
5342 ccw->flags |= CCW_FLAG_CC;
5343 ccw->cda = (__u32)(addr_t) psf_data;
5344
5345 ccw++;
5346
5347 /* RSSD ccw */
5348 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5349 ccw->count = usrparm.rssd_result_len;
5350 ccw->flags = CCW_FLAG_SLI ;
5351 ccw->cda = (__u32)(addr_t) rssd_result;
5352
5353 rc = dasd_sleep_on(cqr);
5354 if (rc)
5355 goto out_sfree;
5356
5357 rc = -EFAULT;
5358 if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
5359 rssd_result, usrparm.rssd_result_len))
5360 goto out_sfree;
5361 rc = 0;
5362
5363 out_sfree:
5364 dasd_sfree_request(cqr, cqr->memdev);
5365 out_free:
5366 kfree(rssd_result);
5367 kfree(psf_data);
5368 out:
5369 DBF_DEV_EVENT(DBF_WARNING, device,
5370 "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
5371 (int) psf0, (int) psf1, rc);
5372 return rc;
5373 }
5374
5375 static int
dasd_eckd_ioctl(struct dasd_block * block,unsigned int cmd,void __user * argp)5376 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
5377 {
5378 struct dasd_device *device = block->base;
5379
5380 switch (cmd) {
5381 case BIODASDGATTR:
5382 return dasd_eckd_get_attrib(device, argp);
5383 case BIODASDSATTR:
5384 return dasd_eckd_set_attrib(device, argp);
5385 case BIODASDPSRD:
5386 return dasd_eckd_performance(device, argp);
5387 case BIODASDRLSE:
5388 return dasd_eckd_release(device);
5389 case BIODASDRSRV:
5390 return dasd_eckd_reserve(device);
5391 case BIODASDSLCK:
5392 return dasd_eckd_steal_lock(device);
5393 case BIODASDSNID:
5394 return dasd_eckd_snid(device, argp);
5395 case BIODASDSYMMIO:
5396 return dasd_symm_io(device, argp);
5397 default:
5398 return -ENOTTY;
5399 }
5400 }
5401
5402 /*
5403 * Dump the range of CCWs into 'page' buffer
5404 * and return number of printed chars.
5405 */
5406 static int
dasd_eckd_dump_ccw_range(struct ccw1 * from,struct ccw1 * to,char * page)5407 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
5408 {
5409 int len, count;
5410 char *datap;
5411
5412 len = 0;
5413 while (from <= to) {
5414 len += sprintf(page + len, PRINTK_HEADER
5415 " CCW %p: %08X %08X DAT:",
5416 from, ((int *) from)[0], ((int *) from)[1]);
5417
5418 /* get pointer to data (consider IDALs) */
5419 if (from->flags & CCW_FLAG_IDA)
5420 datap = (char *) *((addr_t *) (addr_t) from->cda);
5421 else
5422 datap = (char *) ((addr_t) from->cda);
5423
5424 /* dump data (max 32 bytes) */
5425 for (count = 0; count < from->count && count < 32; count++) {
5426 if (count % 8 == 0) len += sprintf(page + len, " ");
5427 if (count % 4 == 0) len += sprintf(page + len, " ");
5428 len += sprintf(page + len, "%02x", datap[count]);
5429 }
5430 len += sprintf(page + len, "\n");
5431 from++;
5432 }
5433 return len;
5434 }
5435
5436 static void
dasd_eckd_dump_sense_dbf(struct dasd_device * device,struct irb * irb,char * reason)5437 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
5438 char *reason)
5439 {
5440 u64 *sense;
5441 u64 *stat;
5442
5443 sense = (u64 *) dasd_get_sense(irb);
5444 stat = (u64 *) &irb->scsw;
5445 if (sense) {
5446 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
5447 "%016llx %016llx %016llx %016llx",
5448 reason, *stat, *((u32 *) (stat + 1)),
5449 sense[0], sense[1], sense[2], sense[3]);
5450 } else {
5451 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
5452 reason, *stat, *((u32 *) (stat + 1)),
5453 "NO VALID SENSE");
5454 }
5455 }
5456
5457 /*
5458 * Print sense data and related channel program.
5459 * Parts are printed because printk buffer is only 1024 bytes.
5460 */
dasd_eckd_dump_sense_ccw(struct dasd_device * device,struct dasd_ccw_req * req,struct irb * irb)5461 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
5462 struct dasd_ccw_req *req, struct irb *irb)
5463 {
5464 char *page;
5465 struct ccw1 *first, *last, *fail, *from, *to;
5466 int len, sl, sct;
5467
5468 page = (char *) get_zeroed_page(GFP_ATOMIC);
5469 if (page == NULL) {
5470 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5471 "No memory to dump sense data\n");
5472 return;
5473 }
5474 /* dump the sense data */
5475 len = sprintf(page, PRINTK_HEADER
5476 " I/O status report for device %s:\n",
5477 dev_name(&device->cdev->dev));
5478 len += sprintf(page + len, PRINTK_HEADER
5479 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
5480 "CS:%02X RC:%d\n",
5481 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
5482 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
5483 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
5484 req ? req->intrc : 0);
5485 len += sprintf(page + len, PRINTK_HEADER
5486 " device %s: Failing CCW: %p\n",
5487 dev_name(&device->cdev->dev),
5488 (void *) (addr_t) irb->scsw.cmd.cpa);
5489 if (irb->esw.esw0.erw.cons) {
5490 for (sl = 0; sl < 4; sl++) {
5491 len += sprintf(page + len, PRINTK_HEADER
5492 " Sense(hex) %2d-%2d:",
5493 (8 * sl), ((8 * sl) + 7));
5494
5495 for (sct = 0; sct < 8; sct++) {
5496 len += sprintf(page + len, " %02x",
5497 irb->ecw[8 * sl + sct]);
5498 }
5499 len += sprintf(page + len, "\n");
5500 }
5501
5502 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
5503 /* 24 Byte Sense Data */
5504 sprintf(page + len, PRINTK_HEADER
5505 " 24 Byte: %x MSG %x, "
5506 "%s MSGb to SYSOP\n",
5507 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
5508 irb->ecw[1] & 0x10 ? "" : "no");
5509 } else {
5510 /* 32 Byte Sense Data */
5511 sprintf(page + len, PRINTK_HEADER
5512 " 32 Byte: Format: %x "
5513 "Exception class %x\n",
5514 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
5515 }
5516 } else {
5517 sprintf(page + len, PRINTK_HEADER
5518 " SORRY - NO VALID SENSE AVAILABLE\n");
5519 }
5520 printk(KERN_ERR "%s", page);
5521
5522 if (req) {
5523 /* req == NULL for unsolicited interrupts */
5524 /* dump the Channel Program (max 140 Bytes per line) */
5525 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
5526 first = req->cpaddr;
5527 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
5528 to = min(first + 6, last);
5529 len = sprintf(page, PRINTK_HEADER
5530 " Related CP in req: %p\n", req);
5531 dasd_eckd_dump_ccw_range(first, to, page + len);
5532 printk(KERN_ERR "%s", page);
5533
5534 /* print failing CCW area (maximum 4) */
5535 /* scsw->cda is either valid or zero */
5536 len = 0;
5537 from = ++to;
5538 fail = (struct ccw1 *)(addr_t)
5539 irb->scsw.cmd.cpa; /* failing CCW */
5540 if (from < fail - 2) {
5541 from = fail - 2; /* there is a gap - print header */
5542 len += sprintf(page, PRINTK_HEADER "......\n");
5543 }
5544 to = min(fail + 1, last);
5545 len += dasd_eckd_dump_ccw_range(from, to, page + len);
5546
5547 /* print last CCWs (maximum 2) */
5548 from = max(from, ++to);
5549 if (from < last - 1) {
5550 from = last - 1; /* there is a gap - print header */
5551 len += sprintf(page + len, PRINTK_HEADER "......\n");
5552 }
5553 len += dasd_eckd_dump_ccw_range(from, last, page + len);
5554 if (len > 0)
5555 printk(KERN_ERR "%s", page);
5556 }
5557 free_page((unsigned long) page);
5558 }
5559
5560
5561 /*
5562 * Print sense data from a tcw.
5563 */
dasd_eckd_dump_sense_tcw(struct dasd_device * device,struct dasd_ccw_req * req,struct irb * irb)5564 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
5565 struct dasd_ccw_req *req, struct irb *irb)
5566 {
5567 char *page;
5568 int len, sl, sct, residual;
5569 struct tsb *tsb;
5570 u8 *sense, *rcq;
5571
5572 page = (char *) get_zeroed_page(GFP_ATOMIC);
5573 if (page == NULL) {
5574 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
5575 "No memory to dump sense data");
5576 return;
5577 }
5578 /* dump the sense data */
5579 len = sprintf(page, PRINTK_HEADER
5580 " I/O status report for device %s:\n",
5581 dev_name(&device->cdev->dev));
5582 len += sprintf(page + len, PRINTK_HEADER
5583 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
5584 "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
5585 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
5586 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
5587 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
5588 irb->scsw.tm.fcxs,
5589 (irb->scsw.tm.ifob << 7) | irb->scsw.tm.sesq,
5590 req ? req->intrc : 0);
5591 len += sprintf(page + len, PRINTK_HEADER
5592 " device %s: Failing TCW: %p\n",
5593 dev_name(&device->cdev->dev),
5594 (void *) (addr_t) irb->scsw.tm.tcw);
5595
5596 tsb = NULL;
5597 sense = NULL;
5598 if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
5599 tsb = tcw_get_tsb(
5600 (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
5601
5602 if (tsb) {
5603 len += sprintf(page + len, PRINTK_HEADER
5604 " tsb->length %d\n", tsb->length);
5605 len += sprintf(page + len, PRINTK_HEADER
5606 " tsb->flags %x\n", tsb->flags);
5607 len += sprintf(page + len, PRINTK_HEADER
5608 " tsb->dcw_offset %d\n", tsb->dcw_offset);
5609 len += sprintf(page + len, PRINTK_HEADER
5610 " tsb->count %d\n", tsb->count);
5611 residual = tsb->count - 28;
5612 len += sprintf(page + len, PRINTK_HEADER
5613 " residual %d\n", residual);
5614
5615 switch (tsb->flags & 0x07) {
5616 case 1: /* tsa_iostat */
5617 len += sprintf(page + len, PRINTK_HEADER
5618 " tsb->tsa.iostat.dev_time %d\n",
5619 tsb->tsa.iostat.dev_time);
5620 len += sprintf(page + len, PRINTK_HEADER
5621 " tsb->tsa.iostat.def_time %d\n",
5622 tsb->tsa.iostat.def_time);
5623 len += sprintf(page + len, PRINTK_HEADER
5624 " tsb->tsa.iostat.queue_time %d\n",
5625 tsb->tsa.iostat.queue_time);
5626 len += sprintf(page + len, PRINTK_HEADER
5627 " tsb->tsa.iostat.dev_busy_time %d\n",
5628 tsb->tsa.iostat.dev_busy_time);
5629 len += sprintf(page + len, PRINTK_HEADER
5630 " tsb->tsa.iostat.dev_act_time %d\n",
5631 tsb->tsa.iostat.dev_act_time);
5632 sense = tsb->tsa.iostat.sense;
5633 break;
5634 case 2: /* ts_ddpc */
5635 len += sprintf(page + len, PRINTK_HEADER
5636 " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
5637 for (sl = 0; sl < 2; sl++) {
5638 len += sprintf(page + len, PRINTK_HEADER
5639 " tsb->tsa.ddpc.rcq %2d-%2d: ",
5640 (8 * sl), ((8 * sl) + 7));
5641 rcq = tsb->tsa.ddpc.rcq;
5642 for (sct = 0; sct < 8; sct++) {
5643 len += sprintf(page + len, " %02x",
5644 rcq[8 * sl + sct]);
5645 }
5646 len += sprintf(page + len, "\n");
5647 }
5648 sense = tsb->tsa.ddpc.sense;
5649 break;
5650 case 3: /* tsa_intrg */
5651 len += sprintf(page + len, PRINTK_HEADER
5652 " tsb->tsa.intrg.: not supported yet\n");
5653 break;
5654 }
5655
5656 if (sense) {
5657 for (sl = 0; sl < 4; sl++) {
5658 len += sprintf(page + len, PRINTK_HEADER
5659 " Sense(hex) %2d-%2d:",
5660 (8 * sl), ((8 * sl) + 7));
5661 for (sct = 0; sct < 8; sct++) {
5662 len += sprintf(page + len, " %02x",
5663 sense[8 * sl + sct]);
5664 }
5665 len += sprintf(page + len, "\n");
5666 }
5667
5668 if (sense[27] & DASD_SENSE_BIT_0) {
5669 /* 24 Byte Sense Data */
5670 sprintf(page + len, PRINTK_HEADER
5671 " 24 Byte: %x MSG %x, "
5672 "%s MSGb to SYSOP\n",
5673 sense[7] >> 4, sense[7] & 0x0f,
5674 sense[1] & 0x10 ? "" : "no");
5675 } else {
5676 /* 32 Byte Sense Data */
5677 sprintf(page + len, PRINTK_HEADER
5678 " 32 Byte: Format: %x "
5679 "Exception class %x\n",
5680 sense[6] & 0x0f, sense[22] >> 4);
5681 }
5682 } else {
5683 sprintf(page + len, PRINTK_HEADER
5684 " SORRY - NO VALID SENSE AVAILABLE\n");
5685 }
5686 } else {
5687 sprintf(page + len, PRINTK_HEADER
5688 " SORRY - NO TSB DATA AVAILABLE\n");
5689 }
5690 printk(KERN_ERR "%s", page);
5691 free_page((unsigned long) page);
5692 }
5693
dasd_eckd_dump_sense(struct dasd_device * device,struct dasd_ccw_req * req,struct irb * irb)5694 static void dasd_eckd_dump_sense(struct dasd_device *device,
5695 struct dasd_ccw_req *req, struct irb *irb)
5696 {
5697 u8 *sense = dasd_get_sense(irb);
5698
5699 if (scsw_is_tm(&irb->scsw)) {
5700 /*
5701 * In some cases the 'File Protected' or 'Incorrect Length'
5702 * error might be expected and log messages shouldn't be written
5703 * then. Check if the according suppress bit is set.
5704 */
5705 if (sense && (sense[1] & SNS1_FILE_PROTECTED) &&
5706 test_bit(DASD_CQR_SUPPRESS_FP, &req->flags))
5707 return;
5708 if (scsw_cstat(&irb->scsw) == 0x40 &&
5709 test_bit(DASD_CQR_SUPPRESS_IL, &req->flags))
5710 return;
5711
5712 dasd_eckd_dump_sense_tcw(device, req, irb);
5713 } else {
5714 /*
5715 * In some cases the 'Command Reject' or 'No Record Found'
5716 * error might be expected and log messages shouldn't be
5717 * written then. Check if the according suppress bit is set.
5718 */
5719 if (sense && sense[0] & SNS0_CMD_REJECT &&
5720 test_bit(DASD_CQR_SUPPRESS_CR, &req->flags))
5721 return;
5722
5723 if (sense && sense[1] & SNS1_NO_REC_FOUND &&
5724 test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags))
5725 return;
5726
5727 dasd_eckd_dump_sense_ccw(device, req, irb);
5728 }
5729 }
5730
dasd_eckd_pm_freeze(struct dasd_device * device)5731 static int dasd_eckd_pm_freeze(struct dasd_device *device)
5732 {
5733 /*
5734 * the device should be disconnected from our LCU structure
5735 * on restore we will reconnect it and reread LCU specific
5736 * information like PAV support that might have changed
5737 */
5738 dasd_alias_remove_device(device);
5739 dasd_alias_disconnect_device_from_lcu(device);
5740
5741 return 0;
5742 }
5743
dasd_eckd_restore_device(struct dasd_device * device)5744 static int dasd_eckd_restore_device(struct dasd_device *device)
5745 {
5746 struct dasd_eckd_private *private = device->private;
5747 struct dasd_eckd_characteristics temp_rdc_data;
5748 int rc;
5749 struct dasd_uid temp_uid;
5750 unsigned long flags;
5751 unsigned long cqr_flags = 0;
5752
5753 /* Read Configuration Data */
5754 rc = dasd_eckd_read_conf(device);
5755 if (rc) {
5756 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5757 "Read configuration data failed, rc=%d", rc);
5758 goto out_err;
5759 }
5760
5761 dasd_eckd_get_uid(device, &temp_uid);
5762 /* Generate device unique id */
5763 rc = dasd_eckd_generate_uid(device);
5764 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
5765 if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
5766 dev_err(&device->cdev->dev, "The UID of the DASD has "
5767 "changed\n");
5768 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
5769 if (rc)
5770 goto out_err;
5771
5772 /* register lcu with alias handling, enable PAV if this is a new lcu */
5773 rc = dasd_alias_make_device_known_to_lcu(device);
5774 if (rc)
5775 goto out_err;
5776
5777 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
5778 dasd_eckd_validate_server(device, cqr_flags);
5779
5780 /* RE-Read Configuration Data */
5781 rc = dasd_eckd_read_conf(device);
5782 if (rc) {
5783 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5784 "Read configuration data failed, rc=%d", rc);
5785 goto out_err2;
5786 }
5787
5788 /* Read Feature Codes */
5789 dasd_eckd_read_features(device);
5790
5791 /* Read Volume Information */
5792 dasd_eckd_read_vol_info(device);
5793
5794 /* Read Extent Pool Information */
5795 dasd_eckd_read_ext_pool_info(device);
5796
5797 /* Read Device Characteristics */
5798 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
5799 &temp_rdc_data, 64);
5800 if (rc) {
5801 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5802 "Read device characteristic failed, rc=%d", rc);
5803 goto out_err2;
5804 }
5805 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
5806 memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
5807 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
5808
5809 /* add device to alias management */
5810 dasd_alias_add_device(device);
5811
5812 return 0;
5813
5814 out_err2:
5815 dasd_alias_disconnect_device_from_lcu(device);
5816 out_err:
5817 return -1;
5818 }
5819
dasd_eckd_reload_device(struct dasd_device * device)5820 static int dasd_eckd_reload_device(struct dasd_device *device)
5821 {
5822 struct dasd_eckd_private *private = device->private;
5823 int rc, old_base;
5824 char print_uid[60];
5825 struct dasd_uid uid;
5826 unsigned long flags;
5827
5828 /*
5829 * remove device from alias handling to prevent new requests
5830 * from being scheduled on the wrong alias device
5831 */
5832 dasd_alias_remove_device(device);
5833
5834 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
5835 old_base = private->uid.base_unit_addr;
5836 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
5837
5838 /* Read Configuration Data */
5839 rc = dasd_eckd_read_conf(device);
5840 if (rc)
5841 goto out_err;
5842
5843 rc = dasd_eckd_generate_uid(device);
5844 if (rc)
5845 goto out_err;
5846 /*
5847 * update unit address configuration and
5848 * add device to alias management
5849 */
5850 dasd_alias_update_add_device(device);
5851
5852 dasd_eckd_get_uid(device, &uid);
5853
5854 if (old_base != uid.base_unit_addr) {
5855 if (strlen(uid.vduit) > 0)
5856 snprintf(print_uid, sizeof(print_uid),
5857 "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
5858 uid.ssid, uid.base_unit_addr, uid.vduit);
5859 else
5860 snprintf(print_uid, sizeof(print_uid),
5861 "%s.%s.%04x.%02x", uid.vendor, uid.serial,
5862 uid.ssid, uid.base_unit_addr);
5863
5864 dev_info(&device->cdev->dev,
5865 "An Alias device was reassigned to a new base device "
5866 "with UID: %s\n", print_uid);
5867 }
5868 return 0;
5869
5870 out_err:
5871 return -1;
5872 }
5873
dasd_eckd_read_message_buffer(struct dasd_device * device,struct dasd_rssd_messages * messages,__u8 lpum)5874 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
5875 struct dasd_rssd_messages *messages,
5876 __u8 lpum)
5877 {
5878 struct dasd_rssd_messages *message_buf;
5879 struct dasd_psf_prssd_data *prssdp;
5880 struct dasd_ccw_req *cqr;
5881 struct ccw1 *ccw;
5882 int rc;
5883
5884 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5885 (sizeof(struct dasd_psf_prssd_data) +
5886 sizeof(struct dasd_rssd_messages)),
5887 device, NULL);
5888 if (IS_ERR(cqr)) {
5889 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5890 "Could not allocate read message buffer request");
5891 return PTR_ERR(cqr);
5892 }
5893
5894 cqr->lpm = lpum;
5895 retry:
5896 cqr->startdev = device;
5897 cqr->memdev = device;
5898 cqr->block = NULL;
5899 cqr->expires = 10 * HZ;
5900 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5901 /* dasd_sleep_on_immediatly does not do complex error
5902 * recovery so clear erp flag and set retry counter to
5903 * do basic erp */
5904 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5905 cqr->retries = 256;
5906
5907 /* Prepare for Read Subsystem Data */
5908 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5909 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5910 prssdp->order = PSF_ORDER_PRSSD;
5911 prssdp->suborder = 0x03; /* Message Buffer */
5912 /* all other bytes of prssdp must be zero */
5913
5914 ccw = cqr->cpaddr;
5915 ccw->cmd_code = DASD_ECKD_CCW_PSF;
5916 ccw->count = sizeof(struct dasd_psf_prssd_data);
5917 ccw->flags |= CCW_FLAG_CC;
5918 ccw->flags |= CCW_FLAG_SLI;
5919 ccw->cda = (__u32)(addr_t) prssdp;
5920
5921 /* Read Subsystem Data - message buffer */
5922 message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
5923 memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
5924
5925 ccw++;
5926 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5927 ccw->count = sizeof(struct dasd_rssd_messages);
5928 ccw->flags |= CCW_FLAG_SLI;
5929 ccw->cda = (__u32)(addr_t) message_buf;
5930
5931 cqr->buildclk = get_tod_clock();
5932 cqr->status = DASD_CQR_FILLED;
5933 rc = dasd_sleep_on_immediatly(cqr);
5934 if (rc == 0) {
5935 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5936 message_buf = (struct dasd_rssd_messages *)
5937 (prssdp + 1);
5938 memcpy(messages, message_buf,
5939 sizeof(struct dasd_rssd_messages));
5940 } else if (cqr->lpm) {
5941 /*
5942 * on z/VM we might not be able to do I/O on the requested path
5943 * but instead we get the required information on any path
5944 * so retry with open path mask
5945 */
5946 cqr->lpm = 0;
5947 goto retry;
5948 } else
5949 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5950 "Reading messages failed with rc=%d\n"
5951 , rc);
5952 dasd_sfree_request(cqr, cqr->memdev);
5953 return rc;
5954 }
5955
dasd_eckd_query_host_access(struct dasd_device * device,struct dasd_psf_query_host_access * data)5956 static int dasd_eckd_query_host_access(struct dasd_device *device,
5957 struct dasd_psf_query_host_access *data)
5958 {
5959 struct dasd_eckd_private *private = device->private;
5960 struct dasd_psf_query_host_access *host_access;
5961 struct dasd_psf_prssd_data *prssdp;
5962 struct dasd_ccw_req *cqr;
5963 struct ccw1 *ccw;
5964 int rc;
5965
5966 /* not available for HYPER PAV alias devices */
5967 if (!device->block && private->lcu->pav == HYPER_PAV)
5968 return -EOPNOTSUPP;
5969
5970 /* may not be supported by the storage server */
5971 if (!(private->features.feature[14] & 0x80))
5972 return -EOPNOTSUPP;
5973
5974 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5975 sizeof(struct dasd_psf_prssd_data) + 1,
5976 device, NULL);
5977 if (IS_ERR(cqr)) {
5978 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5979 "Could not allocate read message buffer request");
5980 return PTR_ERR(cqr);
5981 }
5982 host_access = kzalloc(sizeof(*host_access), GFP_KERNEL | GFP_DMA);
5983 if (!host_access) {
5984 dasd_sfree_request(cqr, device);
5985 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5986 "Could not allocate host_access buffer");
5987 return -ENOMEM;
5988 }
5989 cqr->startdev = device;
5990 cqr->memdev = device;
5991 cqr->block = NULL;
5992 cqr->retries = 256;
5993 cqr->expires = 10 * HZ;
5994
5995 /* Prepare for Read Subsystem Data */
5996 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5997 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5998 prssdp->order = PSF_ORDER_PRSSD;
5999 prssdp->suborder = PSF_SUBORDER_QHA; /* query host access */
6000 /* LSS and Volume that will be queried */
6001 prssdp->lss = private->ned->ID;
6002 prssdp->volume = private->ned->unit_addr;
6003 /* all other bytes of prssdp must be zero */
6004
6005 ccw = cqr->cpaddr;
6006 ccw->cmd_code = DASD_ECKD_CCW_PSF;
6007 ccw->count = sizeof(struct dasd_psf_prssd_data);
6008 ccw->flags |= CCW_FLAG_CC;
6009 ccw->flags |= CCW_FLAG_SLI;
6010 ccw->cda = (__u32)(addr_t) prssdp;
6011
6012 /* Read Subsystem Data - query host access */
6013 ccw++;
6014 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
6015 ccw->count = sizeof(struct dasd_psf_query_host_access);
6016 ccw->flags |= CCW_FLAG_SLI;
6017 ccw->cda = (__u32)(addr_t) host_access;
6018
6019 cqr->buildclk = get_tod_clock();
6020 cqr->status = DASD_CQR_FILLED;
6021 /* the command might not be supported, suppress error message */
6022 __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
6023 rc = dasd_sleep_on_interruptible(cqr);
6024 if (rc == 0) {
6025 *data = *host_access;
6026 } else {
6027 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
6028 "Reading host access data failed with rc=%d\n",
6029 rc);
6030 rc = -EOPNOTSUPP;
6031 }
6032
6033 dasd_sfree_request(cqr, cqr->memdev);
6034 kfree(host_access);
6035 return rc;
6036 }
6037 /*
6038 * return number of grouped devices
6039 */
dasd_eckd_host_access_count(struct dasd_device * device)6040 static int dasd_eckd_host_access_count(struct dasd_device *device)
6041 {
6042 struct dasd_psf_query_host_access *access;
6043 struct dasd_ckd_path_group_entry *entry;
6044 struct dasd_ckd_host_information *info;
6045 int count = 0;
6046 int rc, i;
6047
6048 access = kzalloc(sizeof(*access), GFP_NOIO);
6049 if (!access) {
6050 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6051 "Could not allocate access buffer");
6052 return -ENOMEM;
6053 }
6054 rc = dasd_eckd_query_host_access(device, access);
6055 if (rc) {
6056 kfree(access);
6057 return rc;
6058 }
6059
6060 info = (struct dasd_ckd_host_information *)
6061 access->host_access_information;
6062 for (i = 0; i < info->entry_count; i++) {
6063 entry = (struct dasd_ckd_path_group_entry *)
6064 (info->entry + i * info->entry_size);
6065 if (entry->status_flags & DASD_ECKD_PG_GROUPED)
6066 count++;
6067 }
6068
6069 kfree(access);
6070 return count;
6071 }
6072
6073 /*
6074 * write host access information to a sequential file
6075 */
dasd_hosts_print(struct dasd_device * device,struct seq_file * m)6076 static int dasd_hosts_print(struct dasd_device *device, struct seq_file *m)
6077 {
6078 struct dasd_psf_query_host_access *access;
6079 struct dasd_ckd_path_group_entry *entry;
6080 struct dasd_ckd_host_information *info;
6081 char sysplex[9] = "";
6082 int rc, i;
6083
6084 access = kzalloc(sizeof(*access), GFP_NOIO);
6085 if (!access) {
6086 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6087 "Could not allocate access buffer");
6088 return -ENOMEM;
6089 }
6090 rc = dasd_eckd_query_host_access(device, access);
6091 if (rc) {
6092 kfree(access);
6093 return rc;
6094 }
6095
6096 info = (struct dasd_ckd_host_information *)
6097 access->host_access_information;
6098 for (i = 0; i < info->entry_count; i++) {
6099 entry = (struct dasd_ckd_path_group_entry *)
6100 (info->entry + i * info->entry_size);
6101 /* PGID */
6102 seq_printf(m, "pgid %*phN\n", 11, entry->pgid);
6103 /* FLAGS */
6104 seq_printf(m, "status_flags %02x\n", entry->status_flags);
6105 /* SYSPLEX NAME */
6106 memcpy(&sysplex, &entry->sysplex_name, sizeof(sysplex) - 1);
6107 EBCASC(sysplex, sizeof(sysplex));
6108 seq_printf(m, "sysplex_name %8s\n", sysplex);
6109 /* SUPPORTED CYLINDER */
6110 seq_printf(m, "supported_cylinder %d\n", entry->cylinder);
6111 /* TIMESTAMP */
6112 seq_printf(m, "timestamp %lu\n", (unsigned long)
6113 entry->timestamp);
6114 }
6115 kfree(access);
6116
6117 return 0;
6118 }
6119
6120 /*
6121 * Perform Subsystem Function - CUIR response
6122 */
6123 static int
dasd_eckd_psf_cuir_response(struct dasd_device * device,int response,__u32 message_id,__u8 lpum)6124 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
6125 __u32 message_id, __u8 lpum)
6126 {
6127 struct dasd_psf_cuir_response *psf_cuir;
6128 int pos = pathmask_to_pos(lpum);
6129 struct dasd_ccw_req *cqr;
6130 struct ccw1 *ccw;
6131 int rc;
6132
6133 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
6134 sizeof(struct dasd_psf_cuir_response),
6135 device, NULL);
6136
6137 if (IS_ERR(cqr)) {
6138 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6139 "Could not allocate PSF-CUIR request");
6140 return PTR_ERR(cqr);
6141 }
6142
6143 psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
6144 psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
6145 psf_cuir->cc = response;
6146 psf_cuir->chpid = device->path[pos].chpid;
6147 psf_cuir->message_id = message_id;
6148 psf_cuir->cssid = device->path[pos].cssid;
6149 psf_cuir->ssid = device->path[pos].ssid;
6150 ccw = cqr->cpaddr;
6151 ccw->cmd_code = DASD_ECKD_CCW_PSF;
6152 ccw->cda = (__u32)(addr_t)psf_cuir;
6153 ccw->flags = CCW_FLAG_SLI;
6154 ccw->count = sizeof(struct dasd_psf_cuir_response);
6155
6156 cqr->startdev = device;
6157 cqr->memdev = device;
6158 cqr->block = NULL;
6159 cqr->retries = 256;
6160 cqr->expires = 10*HZ;
6161 cqr->buildclk = get_tod_clock();
6162 cqr->status = DASD_CQR_FILLED;
6163 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
6164
6165 rc = dasd_sleep_on(cqr);
6166
6167 dasd_sfree_request(cqr, cqr->memdev);
6168 return rc;
6169 }
6170
6171 /*
6172 * return configuration data that is referenced by record selector
6173 * if a record selector is specified or per default return the
6174 * conf_data pointer for the path specified by lpum
6175 */
dasd_eckd_get_ref_conf(struct dasd_device * device,__u8 lpum,struct dasd_cuir_message * cuir)6176 static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
6177 __u8 lpum,
6178 struct dasd_cuir_message *cuir)
6179 {
6180 struct dasd_conf_data *conf_data;
6181 int path, pos;
6182
6183 if (cuir->record_selector == 0)
6184 goto out;
6185 for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
6186 conf_data = device->path[pos].conf_data;
6187 if (conf_data->gneq.record_selector ==
6188 cuir->record_selector)
6189 return conf_data;
6190 }
6191 out:
6192 return device->path[pathmask_to_pos(lpum)].conf_data;
6193 }
6194
6195 /*
6196 * This function determines the scope of a reconfiguration request by
6197 * analysing the path and device selection data provided in the CUIR request.
6198 * Returns a path mask containing CUIR affected paths for the give device.
6199 *
6200 * If the CUIR request does not contain the required information return the
6201 * path mask of the path the attention message for the CUIR request was reveived
6202 * on.
6203 */
dasd_eckd_cuir_scope(struct dasd_device * device,__u8 lpum,struct dasd_cuir_message * cuir)6204 static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
6205 struct dasd_cuir_message *cuir)
6206 {
6207 struct dasd_conf_data *ref_conf_data;
6208 unsigned long bitmask = 0, mask = 0;
6209 struct dasd_conf_data *conf_data;
6210 unsigned int pos, path;
6211 char *ref_gneq, *gneq;
6212 char *ref_ned, *ned;
6213 int tbcpm = 0;
6214
6215 /* if CUIR request does not specify the scope use the path
6216 the attention message was presented on */
6217 if (!cuir->ned_map ||
6218 !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
6219 return lpum;
6220
6221 /* get reference conf data */
6222 ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
6223 /* reference ned is determined by ned_map field */
6224 pos = 8 - ffs(cuir->ned_map);
6225 ref_ned = (char *)&ref_conf_data->neds[pos];
6226 ref_gneq = (char *)&ref_conf_data->gneq;
6227 /* transfer 24 bit neq_map to mask */
6228 mask = cuir->neq_map[2];
6229 mask |= cuir->neq_map[1] << 8;
6230 mask |= cuir->neq_map[0] << 16;
6231
6232 for (path = 0; path < 8; path++) {
6233 /* initialise data per path */
6234 bitmask = mask;
6235 conf_data = device->path[path].conf_data;
6236 pos = 8 - ffs(cuir->ned_map);
6237 ned = (char *) &conf_data->neds[pos];
6238 /* compare reference ned and per path ned */
6239 if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
6240 continue;
6241 gneq = (char *)&conf_data->gneq;
6242 /* compare reference gneq and per_path gneq under
6243 24 bit mask where mask bit 0 equals byte 7 of
6244 the gneq and mask bit 24 equals byte 31 */
6245 while (bitmask) {
6246 pos = ffs(bitmask) - 1;
6247 if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
6248 != 0)
6249 break;
6250 clear_bit(pos, &bitmask);
6251 }
6252 if (bitmask)
6253 continue;
6254 /* device and path match the reference values
6255 add path to CUIR scope */
6256 tbcpm |= 0x80 >> path;
6257 }
6258 return tbcpm;
6259 }
6260
dasd_eckd_cuir_notify_user(struct dasd_device * device,unsigned long paths,int action)6261 static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
6262 unsigned long paths, int action)
6263 {
6264 int pos;
6265
6266 while (paths) {
6267 /* get position of bit in mask */
6268 pos = 8 - ffs(paths);
6269 /* get channel path descriptor from this position */
6270 if (action == CUIR_QUIESCE)
6271 pr_warn("Service on the storage server caused path %x.%02x to go offline",
6272 device->path[pos].cssid,
6273 device->path[pos].chpid);
6274 else if (action == CUIR_RESUME)
6275 pr_info("Path %x.%02x is back online after service on the storage server",
6276 device->path[pos].cssid,
6277 device->path[pos].chpid);
6278 clear_bit(7 - pos, &paths);
6279 }
6280 }
6281
dasd_eckd_cuir_remove_path(struct dasd_device * device,__u8 lpum,struct dasd_cuir_message * cuir)6282 static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
6283 struct dasd_cuir_message *cuir)
6284 {
6285 unsigned long tbcpm;
6286
6287 tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
6288 /* nothing to do if path is not in use */
6289 if (!(dasd_path_get_opm(device) & tbcpm))
6290 return 0;
6291 if (!(dasd_path_get_opm(device) & ~tbcpm)) {
6292 /* no path would be left if the CUIR action is taken
6293 return error */
6294 return -EINVAL;
6295 }
6296 /* remove device from operational path mask */
6297 dasd_path_remove_opm(device, tbcpm);
6298 dasd_path_add_cuirpm(device, tbcpm);
6299 return tbcpm;
6300 }
6301
6302 /*
6303 * walk through all devices and build a path mask to quiesce them
6304 * return an error if the last path to a device would be removed
6305 *
6306 * if only part of the devices are quiesced and an error
6307 * occurs no onlining necessary, the storage server will
6308 * notify the already set offline devices again
6309 */
dasd_eckd_cuir_quiesce(struct dasd_device * device,__u8 lpum,struct dasd_cuir_message * cuir)6310 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
6311 struct dasd_cuir_message *cuir)
6312 {
6313 struct dasd_eckd_private *private = device->private;
6314 struct alias_pav_group *pavgroup, *tempgroup;
6315 struct dasd_device *dev, *n;
6316 unsigned long paths = 0;
6317 unsigned long flags;
6318 int tbcpm;
6319
6320 /* active devices */
6321 list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
6322 alias_list) {
6323 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6324 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6325 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
6326 if (tbcpm < 0)
6327 goto out_err;
6328 paths |= tbcpm;
6329 }
6330 /* inactive devices */
6331 list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
6332 alias_list) {
6333 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6334 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6335 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
6336 if (tbcpm < 0)
6337 goto out_err;
6338 paths |= tbcpm;
6339 }
6340 /* devices in PAV groups */
6341 list_for_each_entry_safe(pavgroup, tempgroup,
6342 &private->lcu->grouplist, group) {
6343 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
6344 alias_list) {
6345 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6346 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6347 spin_unlock_irqrestore(
6348 get_ccwdev_lock(dev->cdev), flags);
6349 if (tbcpm < 0)
6350 goto out_err;
6351 paths |= tbcpm;
6352 }
6353 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
6354 alias_list) {
6355 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6356 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6357 spin_unlock_irqrestore(
6358 get_ccwdev_lock(dev->cdev), flags);
6359 if (tbcpm < 0)
6360 goto out_err;
6361 paths |= tbcpm;
6362 }
6363 }
6364 /* notify user about all paths affected by CUIR action */
6365 dasd_eckd_cuir_notify_user(device, paths, CUIR_QUIESCE);
6366 return 0;
6367 out_err:
6368 return tbcpm;
6369 }
6370
dasd_eckd_cuir_resume(struct dasd_device * device,__u8 lpum,struct dasd_cuir_message * cuir)6371 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
6372 struct dasd_cuir_message *cuir)
6373 {
6374 struct dasd_eckd_private *private = device->private;
6375 struct alias_pav_group *pavgroup, *tempgroup;
6376 struct dasd_device *dev, *n;
6377 unsigned long paths = 0;
6378 int tbcpm;
6379
6380 /*
6381 * the path may have been added through a generic path event before
6382 * only trigger path verification if the path is not already in use
6383 */
6384 list_for_each_entry_safe(dev, n,
6385 &private->lcu->active_devices,
6386 alias_list) {
6387 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6388 paths |= tbcpm;
6389 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6390 dasd_path_add_tbvpm(dev, tbcpm);
6391 dasd_schedule_device_bh(dev);
6392 }
6393 }
6394 list_for_each_entry_safe(dev, n,
6395 &private->lcu->inactive_devices,
6396 alias_list) {
6397 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6398 paths |= tbcpm;
6399 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6400 dasd_path_add_tbvpm(dev, tbcpm);
6401 dasd_schedule_device_bh(dev);
6402 }
6403 }
6404 /* devices in PAV groups */
6405 list_for_each_entry_safe(pavgroup, tempgroup,
6406 &private->lcu->grouplist,
6407 group) {
6408 list_for_each_entry_safe(dev, n,
6409 &pavgroup->baselist,
6410 alias_list) {
6411 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6412 paths |= tbcpm;
6413 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6414 dasd_path_add_tbvpm(dev, tbcpm);
6415 dasd_schedule_device_bh(dev);
6416 }
6417 }
6418 list_for_each_entry_safe(dev, n,
6419 &pavgroup->aliaslist,
6420 alias_list) {
6421 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6422 paths |= tbcpm;
6423 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6424 dasd_path_add_tbvpm(dev, tbcpm);
6425 dasd_schedule_device_bh(dev);
6426 }
6427 }
6428 }
6429 /* notify user about all paths affected by CUIR action */
6430 dasd_eckd_cuir_notify_user(device, paths, CUIR_RESUME);
6431 return 0;
6432 }
6433
dasd_eckd_handle_cuir(struct dasd_device * device,void * messages,__u8 lpum)6434 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
6435 __u8 lpum)
6436 {
6437 struct dasd_cuir_message *cuir = messages;
6438 int response;
6439
6440 DBF_DEV_EVENT(DBF_WARNING, device,
6441 "CUIR request: %016llx %016llx %016llx %08x",
6442 ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
6443 ((u32 *)cuir)[3]);
6444
6445 if (cuir->code == CUIR_QUIESCE) {
6446 /* quiesce */
6447 if (dasd_eckd_cuir_quiesce(device, lpum, cuir))
6448 response = PSF_CUIR_LAST_PATH;
6449 else
6450 response = PSF_CUIR_COMPLETED;
6451 } else if (cuir->code == CUIR_RESUME) {
6452 /* resume */
6453 dasd_eckd_cuir_resume(device, lpum, cuir);
6454 response = PSF_CUIR_COMPLETED;
6455 } else
6456 response = PSF_CUIR_NOT_SUPPORTED;
6457
6458 dasd_eckd_psf_cuir_response(device, response,
6459 cuir->message_id, lpum);
6460 DBF_DEV_EVENT(DBF_WARNING, device,
6461 "CUIR response: %d on message ID %08x", response,
6462 cuir->message_id);
6463 /* to make sure there is no attention left schedule work again */
6464 device->discipline->check_attention(device, lpum);
6465 }
6466
dasd_eckd_oos_resume(struct dasd_device * device)6467 static void dasd_eckd_oos_resume(struct dasd_device *device)
6468 {
6469 struct dasd_eckd_private *private = device->private;
6470 struct alias_pav_group *pavgroup, *tempgroup;
6471 struct dasd_device *dev, *n;
6472 unsigned long flags;
6473
6474 spin_lock_irqsave(&private->lcu->lock, flags);
6475 list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
6476 alias_list) {
6477 if (dev->stopped & DASD_STOPPED_NOSPC)
6478 dasd_generic_space_avail(dev);
6479 }
6480 list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
6481 alias_list) {
6482 if (dev->stopped & DASD_STOPPED_NOSPC)
6483 dasd_generic_space_avail(dev);
6484 }
6485 /* devices in PAV groups */
6486 list_for_each_entry_safe(pavgroup, tempgroup,
6487 &private->lcu->grouplist,
6488 group) {
6489 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
6490 alias_list) {
6491 if (dev->stopped & DASD_STOPPED_NOSPC)
6492 dasd_generic_space_avail(dev);
6493 }
6494 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
6495 alias_list) {
6496 if (dev->stopped & DASD_STOPPED_NOSPC)
6497 dasd_generic_space_avail(dev);
6498 }
6499 }
6500 spin_unlock_irqrestore(&private->lcu->lock, flags);
6501 }
6502
dasd_eckd_handle_oos(struct dasd_device * device,void * messages,__u8 lpum)6503 static void dasd_eckd_handle_oos(struct dasd_device *device, void *messages,
6504 __u8 lpum)
6505 {
6506 struct dasd_oos_message *oos = messages;
6507
6508 switch (oos->code) {
6509 case REPO_WARN:
6510 case POOL_WARN:
6511 dev_warn(&device->cdev->dev,
6512 "Extent pool usage has reached a critical value\n");
6513 dasd_eckd_oos_resume(device);
6514 break;
6515 case REPO_EXHAUST:
6516 case POOL_EXHAUST:
6517 dev_warn(&device->cdev->dev,
6518 "Extent pool is exhausted\n");
6519 break;
6520 case REPO_RELIEVE:
6521 case POOL_RELIEVE:
6522 dev_info(&device->cdev->dev,
6523 "Extent pool physical space constraint has been relieved\n");
6524 break;
6525 }
6526
6527 /* In any case, update related data */
6528 dasd_eckd_read_ext_pool_info(device);
6529
6530 /* to make sure there is no attention left schedule work again */
6531 device->discipline->check_attention(device, lpum);
6532 }
6533
dasd_eckd_check_attention_work(struct work_struct * work)6534 static void dasd_eckd_check_attention_work(struct work_struct *work)
6535 {
6536 struct check_attention_work_data *data;
6537 struct dasd_rssd_messages *messages;
6538 struct dasd_device *device;
6539 int rc;
6540
6541 data = container_of(work, struct check_attention_work_data, worker);
6542 device = data->device;
6543 messages = kzalloc(sizeof(*messages), GFP_KERNEL);
6544 if (!messages) {
6545 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6546 "Could not allocate attention message buffer");
6547 goto out;
6548 }
6549 rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
6550 if (rc)
6551 goto out;
6552
6553 if (messages->length == ATTENTION_LENGTH_CUIR &&
6554 messages->format == ATTENTION_FORMAT_CUIR)
6555 dasd_eckd_handle_cuir(device, messages, data->lpum);
6556 if (messages->length == ATTENTION_LENGTH_OOS &&
6557 messages->format == ATTENTION_FORMAT_OOS)
6558 dasd_eckd_handle_oos(device, messages, data->lpum);
6559
6560 out:
6561 dasd_put_device(device);
6562 kfree(messages);
6563 kfree(data);
6564 }
6565
dasd_eckd_check_attention(struct dasd_device * device,__u8 lpum)6566 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
6567 {
6568 struct check_attention_work_data *data;
6569
6570 data = kzalloc(sizeof(*data), GFP_ATOMIC);
6571 if (!data)
6572 return -ENOMEM;
6573 INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
6574 dasd_get_device(device);
6575 data->device = device;
6576 data->lpum = lpum;
6577 schedule_work(&data->worker);
6578 return 0;
6579 }
6580
dasd_eckd_disable_hpf_path(struct dasd_device * device,__u8 lpum)6581 static int dasd_eckd_disable_hpf_path(struct dasd_device *device, __u8 lpum)
6582 {
6583 if (~lpum & dasd_path_get_opm(device)) {
6584 dasd_path_add_nohpfpm(device, lpum);
6585 dasd_path_remove_opm(device, lpum);
6586 dev_err(&device->cdev->dev,
6587 "Channel path %02X lost HPF functionality and is disabled\n",
6588 lpum);
6589 return 1;
6590 }
6591 return 0;
6592 }
6593
dasd_eckd_disable_hpf_device(struct dasd_device * device)6594 static void dasd_eckd_disable_hpf_device(struct dasd_device *device)
6595 {
6596 struct dasd_eckd_private *private = device->private;
6597
6598 dev_err(&device->cdev->dev,
6599 "High Performance FICON disabled\n");
6600 private->fcx_max_data = 0;
6601 }
6602
dasd_eckd_hpf_enabled(struct dasd_device * device)6603 static int dasd_eckd_hpf_enabled(struct dasd_device *device)
6604 {
6605 struct dasd_eckd_private *private = device->private;
6606
6607 return private->fcx_max_data ? 1 : 0;
6608 }
6609
dasd_eckd_handle_hpf_error(struct dasd_device * device,struct irb * irb)6610 static void dasd_eckd_handle_hpf_error(struct dasd_device *device,
6611 struct irb *irb)
6612 {
6613 struct dasd_eckd_private *private = device->private;
6614
6615 if (!private->fcx_max_data) {
6616 /* sanity check for no HPF, the error makes no sense */
6617 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6618 "Trying to disable HPF for a non HPF device");
6619 return;
6620 }
6621 if (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX) {
6622 dasd_eckd_disable_hpf_device(device);
6623 } else if (irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX) {
6624 if (dasd_eckd_disable_hpf_path(device, irb->esw.esw1.lpum))
6625 return;
6626 dasd_eckd_disable_hpf_device(device);
6627 dasd_path_set_tbvpm(device,
6628 dasd_path_get_hpfpm(device));
6629 }
6630 /*
6631 * prevent that any new I/O ist started on the device and schedule a
6632 * requeue of existing requests
6633 */
6634 dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC);
6635 dasd_schedule_requeue(device);
6636 }
6637
6638 /*
6639 * Initialize block layer request queue.
6640 */
dasd_eckd_setup_blk_queue(struct dasd_block * block)6641 static void dasd_eckd_setup_blk_queue(struct dasd_block *block)
6642 {
6643 unsigned int logical_block_size = block->bp_block;
6644 struct request_queue *q = block->request_queue;
6645 struct dasd_device *device = block->base;
6646 int max;
6647
6648 if (device->features & DASD_FEATURE_USERAW) {
6649 /*
6650 * the max_blocks value for raw_track access is 256
6651 * it is higher than the native ECKD value because we
6652 * only need one ccw per track
6653 * so the max_hw_sectors are
6654 * 2048 x 512B = 1024kB = 16 tracks
6655 */
6656 max = DASD_ECKD_MAX_BLOCKS_RAW << block->s2b_shift;
6657 } else {
6658 max = DASD_ECKD_MAX_BLOCKS << block->s2b_shift;
6659 }
6660 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
6661 q->limits.max_dev_sectors = max;
6662 blk_queue_logical_block_size(q, logical_block_size);
6663 blk_queue_max_hw_sectors(q, max);
6664 blk_queue_max_segments(q, USHRT_MAX);
6665 /* With page sized segments each segment can be translated into one idaw/tidaw */
6666 blk_queue_max_segment_size(q, PAGE_SIZE);
6667 blk_queue_segment_boundary(q, PAGE_SIZE - 1);
6668 }
6669
6670 static struct ccw_driver dasd_eckd_driver = {
6671 .driver = {
6672 .name = "dasd-eckd",
6673 .owner = THIS_MODULE,
6674 },
6675 .ids = dasd_eckd_ids,
6676 .probe = dasd_eckd_probe,
6677 .remove = dasd_generic_remove,
6678 .set_offline = dasd_generic_set_offline,
6679 .set_online = dasd_eckd_set_online,
6680 .notify = dasd_generic_notify,
6681 .path_event = dasd_generic_path_event,
6682 .shutdown = dasd_generic_shutdown,
6683 .freeze = dasd_generic_pm_freeze,
6684 .thaw = dasd_generic_restore_device,
6685 .restore = dasd_generic_restore_device,
6686 .uc_handler = dasd_generic_uc_handler,
6687 .int_class = IRQIO_DAS,
6688 };
6689
6690 static struct dasd_discipline dasd_eckd_discipline = {
6691 .owner = THIS_MODULE,
6692 .name = "ECKD",
6693 .ebcname = "ECKD",
6694 .check_device = dasd_eckd_check_characteristics,
6695 .uncheck_device = dasd_eckd_uncheck_device,
6696 .do_analysis = dasd_eckd_do_analysis,
6697 .verify_path = dasd_eckd_verify_path,
6698 .basic_to_ready = dasd_eckd_basic_to_ready,
6699 .online_to_ready = dasd_eckd_online_to_ready,
6700 .basic_to_known = dasd_eckd_basic_to_known,
6701 .setup_blk_queue = dasd_eckd_setup_blk_queue,
6702 .fill_geometry = dasd_eckd_fill_geometry,
6703 .start_IO = dasd_start_IO,
6704 .term_IO = dasd_term_IO,
6705 .handle_terminated_request = dasd_eckd_handle_terminated_request,
6706 .format_device = dasd_eckd_format_device,
6707 .check_device_format = dasd_eckd_check_device_format,
6708 .erp_action = dasd_eckd_erp_action,
6709 .erp_postaction = dasd_eckd_erp_postaction,
6710 .check_for_device_change = dasd_eckd_check_for_device_change,
6711 .build_cp = dasd_eckd_build_alias_cp,
6712 .free_cp = dasd_eckd_free_alias_cp,
6713 .dump_sense = dasd_eckd_dump_sense,
6714 .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
6715 .fill_info = dasd_eckd_fill_info,
6716 .ioctl = dasd_eckd_ioctl,
6717 .freeze = dasd_eckd_pm_freeze,
6718 .restore = dasd_eckd_restore_device,
6719 .reload = dasd_eckd_reload_device,
6720 .get_uid = dasd_eckd_get_uid,
6721 .kick_validate = dasd_eckd_kick_validate_server,
6722 .check_attention = dasd_eckd_check_attention,
6723 .host_access_count = dasd_eckd_host_access_count,
6724 .hosts_print = dasd_hosts_print,
6725 .handle_hpf_error = dasd_eckd_handle_hpf_error,
6726 .disable_hpf = dasd_eckd_disable_hpf_device,
6727 .hpf_enabled = dasd_eckd_hpf_enabled,
6728 .reset_path = dasd_eckd_reset_path,
6729 .is_ese = dasd_eckd_is_ese,
6730 .space_allocated = dasd_eckd_space_allocated,
6731 .space_configured = dasd_eckd_space_configured,
6732 .logical_capacity = dasd_eckd_logical_capacity,
6733 .release_space = dasd_eckd_release_space,
6734 .ext_pool_id = dasd_eckd_ext_pool_id,
6735 .ext_size = dasd_eckd_ext_size,
6736 .ext_pool_cap_at_warnlevel = dasd_eckd_ext_pool_cap_at_warnlevel,
6737 .ext_pool_warn_thrshld = dasd_eckd_ext_pool_warn_thrshld,
6738 .ext_pool_oos = dasd_eckd_ext_pool_oos,
6739 .ext_pool_exhaust = dasd_eckd_ext_pool_exhaust,
6740 .ese_format = dasd_eckd_ese_format,
6741 .ese_read = dasd_eckd_ese_read,
6742 };
6743
6744 static int __init
dasd_eckd_init(void)6745 dasd_eckd_init(void)
6746 {
6747 int ret;
6748
6749 ASCEBC(dasd_eckd_discipline.ebcname, 4);
6750 dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
6751 GFP_KERNEL | GFP_DMA);
6752 if (!dasd_reserve_req)
6753 return -ENOMEM;
6754 dasd_vol_info_req = kmalloc(sizeof(*dasd_vol_info_req),
6755 GFP_KERNEL | GFP_DMA);
6756 if (!dasd_vol_info_req)
6757 return -ENOMEM;
6758 path_verification_worker = kmalloc(sizeof(*path_verification_worker),
6759 GFP_KERNEL | GFP_DMA);
6760 if (!path_verification_worker) {
6761 kfree(dasd_reserve_req);
6762 kfree(dasd_vol_info_req);
6763 return -ENOMEM;
6764 }
6765 rawpadpage = (void *)__get_free_page(GFP_KERNEL);
6766 if (!rawpadpage) {
6767 kfree(path_verification_worker);
6768 kfree(dasd_reserve_req);
6769 kfree(dasd_vol_info_req);
6770 return -ENOMEM;
6771 }
6772 ret = ccw_driver_register(&dasd_eckd_driver);
6773 if (!ret)
6774 wait_for_device_probe();
6775 else {
6776 kfree(path_verification_worker);
6777 kfree(dasd_reserve_req);
6778 kfree(dasd_vol_info_req);
6779 free_page((unsigned long)rawpadpage);
6780 }
6781 return ret;
6782 }
6783
6784 static void __exit
dasd_eckd_cleanup(void)6785 dasd_eckd_cleanup(void)
6786 {
6787 ccw_driver_unregister(&dasd_eckd_driver);
6788 kfree(path_verification_worker);
6789 kfree(dasd_reserve_req);
6790 free_page((unsigned long)rawpadpage);
6791 }
6792
6793 module_init(dasd_eckd_init);
6794 module_exit(dasd_eckd_cleanup);
6795