1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include <linux/kernel.h>
3*4882a593Smuzhiyun #include <linux/gfp.h>
4*4882a593Smuzhiyun #include <linux/ide.h>
5*4882a593Smuzhiyun #include <linux/jiffies.h>
6*4882a593Smuzhiyun #include <linux/blkdev.h>
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun DECLARE_WAIT_QUEUE_HEAD(ide_park_wq);
9*4882a593Smuzhiyun
issue_park_cmd(ide_drive_t * drive,unsigned long timeout)10*4882a593Smuzhiyun static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
11*4882a593Smuzhiyun {
12*4882a593Smuzhiyun ide_hwif_t *hwif = drive->hwif;
13*4882a593Smuzhiyun struct request_queue *q = drive->queue;
14*4882a593Smuzhiyun struct request *rq;
15*4882a593Smuzhiyun int rc;
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun timeout += jiffies;
18*4882a593Smuzhiyun spin_lock_irq(&hwif->lock);
19*4882a593Smuzhiyun if (drive->dev_flags & IDE_DFLAG_PARKED) {
20*4882a593Smuzhiyun int reset_timer = time_before(timeout, drive->sleep);
21*4882a593Smuzhiyun int start_queue = 0;
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun drive->sleep = timeout;
24*4882a593Smuzhiyun wake_up_all(&ide_park_wq);
25*4882a593Smuzhiyun if (reset_timer && del_timer(&hwif->timer))
26*4882a593Smuzhiyun start_queue = 1;
27*4882a593Smuzhiyun spin_unlock_irq(&hwif->lock);
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun if (start_queue)
30*4882a593Smuzhiyun blk_mq_run_hw_queues(q, true);
31*4882a593Smuzhiyun return;
32*4882a593Smuzhiyun }
33*4882a593Smuzhiyun spin_unlock_irq(&hwif->lock);
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun rq = blk_get_request(q, REQ_OP_DRV_IN, 0);
36*4882a593Smuzhiyun scsi_req(rq)->cmd[0] = REQ_PARK_HEADS;
37*4882a593Smuzhiyun scsi_req(rq)->cmd_len = 1;
38*4882a593Smuzhiyun ide_req(rq)->type = ATA_PRIV_MISC;
39*4882a593Smuzhiyun ide_req(rq)->special = &timeout;
40*4882a593Smuzhiyun blk_execute_rq(q, NULL, rq, 1);
41*4882a593Smuzhiyun rc = scsi_req(rq)->result ? -EIO : 0;
42*4882a593Smuzhiyun blk_put_request(rq);
43*4882a593Smuzhiyun if (rc)
44*4882a593Smuzhiyun goto out;
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun /*
47*4882a593Smuzhiyun * Make sure that *some* command is sent to the drive after the
48*4882a593Smuzhiyun * timeout has expired, so power management will be reenabled.
49*4882a593Smuzhiyun */
50*4882a593Smuzhiyun rq = blk_get_request(q, REQ_OP_DRV_IN, BLK_MQ_REQ_NOWAIT);
51*4882a593Smuzhiyun if (IS_ERR(rq))
52*4882a593Smuzhiyun goto out;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun scsi_req(rq)->cmd[0] = REQ_UNPARK_HEADS;
55*4882a593Smuzhiyun scsi_req(rq)->cmd_len = 1;
56*4882a593Smuzhiyun ide_req(rq)->type = ATA_PRIV_MISC;
57*4882a593Smuzhiyun spin_lock_irq(&hwif->lock);
58*4882a593Smuzhiyun ide_insert_request_head(drive, rq);
59*4882a593Smuzhiyun spin_unlock_irq(&hwif->lock);
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun out:
62*4882a593Smuzhiyun return;
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
ide_do_park_unpark(ide_drive_t * drive,struct request * rq)65*4882a593Smuzhiyun ide_startstop_t ide_do_park_unpark(ide_drive_t *drive, struct request *rq)
66*4882a593Smuzhiyun {
67*4882a593Smuzhiyun struct ide_cmd cmd;
68*4882a593Smuzhiyun struct ide_taskfile *tf = &cmd.tf;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun memset(&cmd, 0, sizeof(cmd));
71*4882a593Smuzhiyun if (scsi_req(rq)->cmd[0] == REQ_PARK_HEADS) {
72*4882a593Smuzhiyun drive->sleep = *(unsigned long *)ide_req(rq)->special;
73*4882a593Smuzhiyun drive->dev_flags |= IDE_DFLAG_SLEEPING;
74*4882a593Smuzhiyun tf->command = ATA_CMD_IDLEIMMEDIATE;
75*4882a593Smuzhiyun tf->feature = 0x44;
76*4882a593Smuzhiyun tf->lbal = 0x4c;
77*4882a593Smuzhiyun tf->lbam = 0x4e;
78*4882a593Smuzhiyun tf->lbah = 0x55;
79*4882a593Smuzhiyun cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
80*4882a593Smuzhiyun cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
81*4882a593Smuzhiyun } else /* cmd == REQ_UNPARK_HEADS */
82*4882a593Smuzhiyun tf->command = ATA_CMD_CHK_POWER;
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun cmd.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER;
85*4882a593Smuzhiyun cmd.protocol = ATA_PROT_NODATA;
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun cmd.rq = rq;
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun return do_rw_taskfile(drive, &cmd);
90*4882a593Smuzhiyun }
91*4882a593Smuzhiyun
ide_park_show(struct device * dev,struct device_attribute * attr,char * buf)92*4882a593Smuzhiyun ssize_t ide_park_show(struct device *dev, struct device_attribute *attr,
93*4882a593Smuzhiyun char *buf)
94*4882a593Smuzhiyun {
95*4882a593Smuzhiyun ide_drive_t *drive = to_ide_device(dev);
96*4882a593Smuzhiyun ide_hwif_t *hwif = drive->hwif;
97*4882a593Smuzhiyun unsigned long now;
98*4882a593Smuzhiyun unsigned int msecs;
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
101*4882a593Smuzhiyun return -EOPNOTSUPP;
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun spin_lock_irq(&hwif->lock);
104*4882a593Smuzhiyun now = jiffies;
105*4882a593Smuzhiyun if (drive->dev_flags & IDE_DFLAG_PARKED &&
106*4882a593Smuzhiyun time_after(drive->sleep, now))
107*4882a593Smuzhiyun msecs = jiffies_to_msecs(drive->sleep - now);
108*4882a593Smuzhiyun else
109*4882a593Smuzhiyun msecs = 0;
110*4882a593Smuzhiyun spin_unlock_irq(&hwif->lock);
111*4882a593Smuzhiyun
112*4882a593Smuzhiyun return snprintf(buf, 20, "%u\n", msecs);
113*4882a593Smuzhiyun }
114*4882a593Smuzhiyun
ide_park_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)115*4882a593Smuzhiyun ssize_t ide_park_store(struct device *dev, struct device_attribute *attr,
116*4882a593Smuzhiyun const char *buf, size_t len)
117*4882a593Smuzhiyun {
118*4882a593Smuzhiyun #define MAX_PARK_TIMEOUT 30000
119*4882a593Smuzhiyun ide_drive_t *drive = to_ide_device(dev);
120*4882a593Smuzhiyun long int input;
121*4882a593Smuzhiyun int rc;
122*4882a593Smuzhiyun
123*4882a593Smuzhiyun rc = kstrtol(buf, 10, &input);
124*4882a593Smuzhiyun if (rc)
125*4882a593Smuzhiyun return rc;
126*4882a593Smuzhiyun if (input < -2)
127*4882a593Smuzhiyun return -EINVAL;
128*4882a593Smuzhiyun if (input > MAX_PARK_TIMEOUT) {
129*4882a593Smuzhiyun input = MAX_PARK_TIMEOUT;
130*4882a593Smuzhiyun rc = -EOVERFLOW;
131*4882a593Smuzhiyun }
132*4882a593Smuzhiyun
133*4882a593Smuzhiyun mutex_lock(&ide_setting_mtx);
134*4882a593Smuzhiyun if (input >= 0) {
135*4882a593Smuzhiyun if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
136*4882a593Smuzhiyun rc = -EOPNOTSUPP;
137*4882a593Smuzhiyun else if (input || drive->dev_flags & IDE_DFLAG_PARKED)
138*4882a593Smuzhiyun issue_park_cmd(drive, msecs_to_jiffies(input));
139*4882a593Smuzhiyun } else {
140*4882a593Smuzhiyun if (drive->media == ide_disk)
141*4882a593Smuzhiyun switch (input) {
142*4882a593Smuzhiyun case -1:
143*4882a593Smuzhiyun drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD;
144*4882a593Smuzhiyun break;
145*4882a593Smuzhiyun case -2:
146*4882a593Smuzhiyun drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
147*4882a593Smuzhiyun break;
148*4882a593Smuzhiyun }
149*4882a593Smuzhiyun else
150*4882a593Smuzhiyun rc = -EOPNOTSUPP;
151*4882a593Smuzhiyun }
152*4882a593Smuzhiyun mutex_unlock(&ide_setting_mtx);
153*4882a593Smuzhiyun
154*4882a593Smuzhiyun return rc ? rc : len;
155*4882a593Smuzhiyun }
156