1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * tape device driver for S/390 and zSeries tapes.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * S390 and zSeries version
6*4882a593Smuzhiyun * Copyright IBM Corp. 2001
7*4882a593Smuzhiyun * Author(s): Carsten Otte <cotte@de.ibm.com>
8*4882a593Smuzhiyun * Michael Holzheu <holzheu@de.ibm.com>
9*4882a593Smuzhiyun * Tuan Ngo-Anh <ngoanh@de.ibm.com>
10*4882a593Smuzhiyun *
11*4882a593Smuzhiyun * PROCFS Functions
12*4882a593Smuzhiyun */
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #define KMSG_COMPONENT "tape"
15*4882a593Smuzhiyun #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #include <linux/module.h>
18*4882a593Smuzhiyun #include <linux/vmalloc.h>
19*4882a593Smuzhiyun #include <linux/seq_file.h>
20*4882a593Smuzhiyun #include <linux/proc_fs.h>
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun #define TAPE_DBF_AREA tape_core_dbf
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun #include "tape.h"
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun static const char *tape_med_st_verbose[MS_SIZE] =
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun [MS_UNKNOWN] = "UNKNOWN ",
29*4882a593Smuzhiyun [MS_LOADED] = "LOADED ",
30*4882a593Smuzhiyun [MS_UNLOADED] = "UNLOADED"
31*4882a593Smuzhiyun };
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun /* our proc tapedevices entry */
34*4882a593Smuzhiyun static struct proc_dir_entry *tape_proc_devices;
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun /*
37*4882a593Smuzhiyun * Show function for /proc/tapedevices
38*4882a593Smuzhiyun */
tape_proc_show(struct seq_file * m,void * v)39*4882a593Smuzhiyun static int tape_proc_show(struct seq_file *m, void *v)
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun struct tape_device *device;
42*4882a593Smuzhiyun struct tape_request *request;
43*4882a593Smuzhiyun const char *str;
44*4882a593Smuzhiyun unsigned long n;
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun n = (unsigned long) v - 1;
47*4882a593Smuzhiyun if (!n) {
48*4882a593Smuzhiyun seq_printf(m, "TapeNo\tBusID CuType/Model\t"
49*4882a593Smuzhiyun "DevType/Model\tBlkSize\tState\tOp\tMedState\n");
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun device = tape_find_device(n);
52*4882a593Smuzhiyun if (IS_ERR(device))
53*4882a593Smuzhiyun return 0;
54*4882a593Smuzhiyun spin_lock_irq(get_ccwdev_lock(device->cdev));
55*4882a593Smuzhiyun seq_printf(m, "%d\t", (int) n);
56*4882a593Smuzhiyun seq_printf(m, "%-10.10s ", dev_name(&device->cdev->dev));
57*4882a593Smuzhiyun seq_printf(m, "%04X/", device->cdev->id.cu_type);
58*4882a593Smuzhiyun seq_printf(m, "%02X\t", device->cdev->id.cu_model);
59*4882a593Smuzhiyun seq_printf(m, "%04X/", device->cdev->id.dev_type);
60*4882a593Smuzhiyun seq_printf(m, "%02X\t\t", device->cdev->id.dev_model);
61*4882a593Smuzhiyun if (device->char_data.block_size == 0)
62*4882a593Smuzhiyun seq_printf(m, "auto\t");
63*4882a593Smuzhiyun else
64*4882a593Smuzhiyun seq_printf(m, "%i\t", device->char_data.block_size);
65*4882a593Smuzhiyun if (device->tape_state >= 0 &&
66*4882a593Smuzhiyun device->tape_state < TS_SIZE)
67*4882a593Smuzhiyun str = tape_state_verbose[device->tape_state];
68*4882a593Smuzhiyun else
69*4882a593Smuzhiyun str = "UNKNOWN";
70*4882a593Smuzhiyun seq_printf(m, "%s\t", str);
71*4882a593Smuzhiyun if (!list_empty(&device->req_queue)) {
72*4882a593Smuzhiyun request = list_entry(device->req_queue.next,
73*4882a593Smuzhiyun struct tape_request, list);
74*4882a593Smuzhiyun str = tape_op_verbose[request->op];
75*4882a593Smuzhiyun } else
76*4882a593Smuzhiyun str = "---";
77*4882a593Smuzhiyun seq_printf(m, "%s\t", str);
78*4882a593Smuzhiyun seq_printf(m, "%s\n", tape_med_st_verbose[device->medium_state]);
79*4882a593Smuzhiyun spin_unlock_irq(get_ccwdev_lock(device->cdev));
80*4882a593Smuzhiyun tape_put_device(device);
81*4882a593Smuzhiyun return 0;
82*4882a593Smuzhiyun }
83*4882a593Smuzhiyun
tape_proc_start(struct seq_file * m,loff_t * pos)84*4882a593Smuzhiyun static void *tape_proc_start(struct seq_file *m, loff_t *pos)
85*4882a593Smuzhiyun {
86*4882a593Smuzhiyun if (*pos >= 256 / TAPE_MINORS_PER_DEV)
87*4882a593Smuzhiyun return NULL;
88*4882a593Smuzhiyun return (void *)((unsigned long) *pos + 1);
89*4882a593Smuzhiyun }
90*4882a593Smuzhiyun
tape_proc_next(struct seq_file * m,void * v,loff_t * pos)91*4882a593Smuzhiyun static void *tape_proc_next(struct seq_file *m, void *v, loff_t *pos)
92*4882a593Smuzhiyun {
93*4882a593Smuzhiyun ++*pos;
94*4882a593Smuzhiyun return tape_proc_start(m, pos);
95*4882a593Smuzhiyun }
96*4882a593Smuzhiyun
tape_proc_stop(struct seq_file * m,void * v)97*4882a593Smuzhiyun static void tape_proc_stop(struct seq_file *m, void *v)
98*4882a593Smuzhiyun {
99*4882a593Smuzhiyun }
100*4882a593Smuzhiyun
101*4882a593Smuzhiyun static const struct seq_operations tape_proc_seq = {
102*4882a593Smuzhiyun .start = tape_proc_start,
103*4882a593Smuzhiyun .next = tape_proc_next,
104*4882a593Smuzhiyun .stop = tape_proc_stop,
105*4882a593Smuzhiyun .show = tape_proc_show,
106*4882a593Smuzhiyun };
107*4882a593Smuzhiyun
108*4882a593Smuzhiyun /*
109*4882a593Smuzhiyun * Initialize procfs stuff on startup
110*4882a593Smuzhiyun */
111*4882a593Smuzhiyun void
tape_proc_init(void)112*4882a593Smuzhiyun tape_proc_init(void)
113*4882a593Smuzhiyun {
114*4882a593Smuzhiyun tape_proc_devices = proc_create_seq("tapedevices", 0444, NULL,
115*4882a593Smuzhiyun &tape_proc_seq);
116*4882a593Smuzhiyun }
117*4882a593Smuzhiyun
118*4882a593Smuzhiyun /*
119*4882a593Smuzhiyun * Cleanup all stuff registered to the procfs
120*4882a593Smuzhiyun */
121*4882a593Smuzhiyun void
tape_proc_cleanup(void)122*4882a593Smuzhiyun tape_proc_cleanup(void)
123*4882a593Smuzhiyun {
124*4882a593Smuzhiyun if (tape_proc_devices != NULL)
125*4882a593Smuzhiyun remove_proc_entry ("tapedevices", NULL);
126*4882a593Smuzhiyun }
127