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1/*
2 * linux/drivers/scsi/scsi_proc.c
3 *
4 * The functions in this file provide an interface between
5 * the PROC file system and the SCSI device drivers
6 * It is mainly used for debugging, statistics and to pass
7 * information directly to the lowlevel driver.
8 *
9 * (c) 1995 Michael Neuffer neuffer@goofy.zdv.uni-mainz.de
10 * Version: 0.99.8 last change: 95/09/13
11 *
12 * generic command parser provided by:
13 * Andreas Heilwagen <crashcar@informatik.uni-koblenz.de>
14 *
15 * generic_proc_info() support of xxxx_info() by:
16 * Michael A. Griffith <grif@acm.org>
17 */
18
19#include <linux/module.h>
20#include <linux/init.h>
21#include <linux/string.h>
22#include <linux/mm.h>
23#include <linux/proc_fs.h>
24#include <linux/errno.h>
25#include <linux/blkdev.h>
26#include <linux/seq_file.h>
27#include <linux/mutex.h>
28#include <linux/gfp.h>
29#include <asm/uaccess.h>
30
31#include <scsi/scsi.h>
32#include <scsi/scsi_device.h>
33#include <scsi/scsi_host.h>
34#include <scsi/scsi_transport.h>
35
36#include "scsi_priv.h"
37#include "scsi_logging.h"
38
39
40/* 4K page size, but our output routines, use some slack for overruns */
41#define PROC_BLOCK_SIZE (3*1024)
42
43static struct proc_dir_entry *proc_scsi;
44
45/* Protect sht->present and sht->proc_dir */
46static DEFINE_MUTEX(global_host_template_mutex);
47
48/**
49 * proc_scsi_read - handle read from /proc by calling host's proc_info() command
50 * @buffer: passed to proc_info
51 * @start: passed to proc_info
52 * @offset: passed to proc_info
53 * @length: passed to proc_info
54 * @eof: returns whether length read was less than requested
55 * @data: pointer to a &struct Scsi_Host
56 */
57
58static int proc_scsi_read(char *buffer, char **start, off_t offset,
59 int length, int *eof, void *data)
60{
61 struct Scsi_Host *shost = data;
62 int n;
63
64 n = shost->hostt->proc_info(shost, buffer, start, offset, length, 0);
65 *eof = (n < length);
66
67 return n;
68}
69
70/**
71 * proc_scsi_write_proc - Handle write to /proc by calling host's proc_info()
72 * @file: not used
73 * @buf: source of data to write.
74 * @count: number of bytes (at most PROC_BLOCK_SIZE) to write.
75 * @data: pointer to &struct Scsi_Host
76 */
77static int proc_scsi_write_proc(struct file *file, const char __user *buf,
78 unsigned long count, void *data)
79{
80 struct Scsi_Host *shost = data;
81 ssize_t ret = -ENOMEM;
82 char *page;
83 char *start;
84
85 if (count > PROC_BLOCK_SIZE)
86 return -EOVERFLOW;
87
88 page = (char *)__get_free_page(GFP_KERNEL);
89 if (page) {
90 ret = -EFAULT;
91 if (copy_from_user(page, buf, count))
92 goto out;
93 ret = shost->hostt->proc_info(shost, page, &start, 0, count, 1);
94 }
95out:
96 free_page((unsigned long)page);
97 return ret;
98}
99
100/**
101 * scsi_proc_hostdir_add - Create directory in /proc for a scsi host
102 * @sht: owner of this directory
103 *
104 * Sets sht->proc_dir to the new directory.
105 */
106
107void scsi_proc_hostdir_add(struct scsi_host_template *sht)
108{
109 if (!sht->proc_info)
110 return;
111
112 mutex_lock(&global_host_template_mutex);
113 if (!sht->present++) {
114 sht->proc_dir = proc_mkdir(sht->proc_name, proc_scsi);
115 if (!sht->proc_dir)
116 printk(KERN_ERR "%s: proc_mkdir failed for %s\n",
117 __func__, sht->proc_name);
118 }
119 mutex_unlock(&global_host_template_mutex);
120}
121
122/**
123 * scsi_proc_hostdir_rm - remove directory in /proc for a scsi host
124 * @sht: owner of directory
125 */
126void scsi_proc_hostdir_rm(struct scsi_host_template *sht)
127{
128 if (!sht->proc_info)
129 return;
130
131 mutex_lock(&global_host_template_mutex);
132 if (!--sht->present && sht->proc_dir) {
133 remove_proc_entry(sht->proc_name, proc_scsi);
134 sht->proc_dir = NULL;
135 }
136 mutex_unlock(&global_host_template_mutex);
137}
138
139
140/**
141 * scsi_proc_host_add - Add entry for this host to appropriate /proc dir
142 * @shost: host to add
143 */
144void scsi_proc_host_add(struct Scsi_Host *shost)
145{
146 struct scsi_host_template *sht = shost->hostt;
147 struct proc_dir_entry *p;
148 char name[10];
149
150 if (!sht->proc_dir)
151 return;
152
153 sprintf(name,"%d", shost->host_no);
154 p = create_proc_read_entry(name, S_IFREG | S_IRUGO | S_IWUSR,
155 sht->proc_dir, proc_scsi_read, shost);
156 if (!p) {
157 printk(KERN_ERR "%s: Failed to register host %d in"
158 "%s\n", __func__, shost->host_no,
159 sht->proc_name);
160 return;
161 }
162
163 p->write_proc = proc_scsi_write_proc;
164}
165
166/**
167 * scsi_proc_host_rm - remove this host's entry from /proc
168 * @shost: which host
169 */
170void scsi_proc_host_rm(struct Scsi_Host *shost)
171{
172 char name[10];
173
174 if (!shost->hostt->proc_dir)
175 return;
176
177 sprintf(name,"%d", shost->host_no);
178 remove_proc_entry(name, shost->hostt->proc_dir);
179}
180/**
181 * proc_print_scsidevice - return data about this host
182 * @dev: A scsi device
183 * @data: &struct seq_file to output to.
184 *
185 * Description: prints Host, Channel, Id, Lun, Vendor, Model, Rev, Type,
186 * and revision.
187 */
188static int proc_print_scsidevice(struct device *dev, void *data)
189{
190 struct scsi_device *sdev;
191 struct seq_file *s = data;
192 int i;
193
194 if (!scsi_is_sdev_device(dev))
195 goto out;
196
197 sdev = to_scsi_device(dev);
198 seq_printf(s,
199 "Host: scsi%d Channel: %02d Id: %02d Lun: %02d\n Vendor: ",
200 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
201 for (i = 0; i < 8; i++) {
202 if (sdev->vendor[i] >= 0x20)
203 seq_printf(s, "%c", sdev->vendor[i]);
204 else
205 seq_printf(s, " ");
206 }
207
208 seq_printf(s, " Model: ");
209 for (i = 0; i < 16; i++) {
210 if (sdev->model[i] >= 0x20)
211 seq_printf(s, "%c", sdev->model[i]);
212 else
213 seq_printf(s, " ");
214 }
215
216 seq_printf(s, " Rev: ");
217 for (i = 0; i < 4; i++) {
218 if (sdev->rev[i] >= 0x20)
219 seq_printf(s, "%c", sdev->rev[i]);
220 else
221 seq_printf(s, " ");
222 }
223
224 seq_printf(s, "\n");
225
226 seq_printf(s, " Type: %s ", scsi_device_type(sdev->type));
227 seq_printf(s, " ANSI SCSI revision: %02x",
228 sdev->scsi_level - (sdev->scsi_level > 1));
229 if (sdev->scsi_level == 2)
230 seq_printf(s, " CCS\n");
231 else
232 seq_printf(s, "\n");
233
234out:
235 return 0;
236}
237
238/**
239 * scsi_add_single_device - Respond to user request to probe for/add device
240 * @host: user-supplied decimal integer
241 * @channel: user-supplied decimal integer
242 * @id: user-supplied decimal integer
243 * @lun: user-supplied decimal integer
244 *
245 * Description: called by writing "scsi add-single-device" to /proc/scsi/scsi.
246 *
247 * does scsi_host_lookup() and either user_scan() if that transport
248 * type supports it, or else scsi_scan_host_selected()
249 *
250 * Note: this seems to be aimed exclusively at SCSI parallel busses.
251 */
252
253static int scsi_add_single_device(uint host, uint channel, uint id, uint lun)
254{
255 struct Scsi_Host *shost;
256 int error = -ENXIO;
257
258 shost = scsi_host_lookup(host);
259 if (!shost)
260 return error;
261
262 if (shost->transportt->user_scan)
263 error = shost->transportt->user_scan(shost, channel, id, lun);
264 else
265 error = scsi_scan_host_selected(shost, channel, id, lun, 1);
266 scsi_host_put(shost);
267 return error;
268}
269
270/**
271 * scsi_remove_single_device - Respond to user request to remove a device
272 * @host: user-supplied decimal integer
273 * @channel: user-supplied decimal integer
274 * @id: user-supplied decimal integer
275 * @lun: user-supplied decimal integer
276 *
277 * Description: called by writing "scsi remove-single-device" to
278 * /proc/scsi/scsi. Does a scsi_device_lookup() and scsi_remove_device()
279 */
280static int scsi_remove_single_device(uint host, uint channel, uint id, uint lun)
281{
282 struct scsi_device *sdev;
283 struct Scsi_Host *shost;
284 int error = -ENXIO;
285
286 shost = scsi_host_lookup(host);
287 if (!shost)
288 return error;
289 sdev = scsi_device_lookup(shost, channel, id, lun);
290 if (sdev) {
291 scsi_remove_device(sdev);
292 scsi_device_put(sdev);
293 error = 0;
294 }
295
296 scsi_host_put(shost);
297 return error;
298}
299
300/**
301 * proc_scsi_write - handle writes to /proc/scsi/scsi
302 * @file: not used
303 * @buf: buffer to write
304 * @length: length of buf, at most PAGE_SIZE
305 * @ppos: not used
306 *
307 * Description: this provides a legacy mechanism to add or remove devices by
308 * Host, Channel, ID, and Lun. To use,
309 * "echo 'scsi add-single-device 0 1 2 3' > /proc/scsi/scsi" or
310 * "echo 'scsi remove-single-device 0 1 2 3' > /proc/scsi/scsi" with
311 * "0 1 2 3" replaced by the Host, Channel, Id, and Lun.
312 *
313 * Note: this seems to be aimed at parallel SCSI. Most modern busses (USB,
314 * SATA, Firewire, Fibre Channel, etc) dynamically assign these values to
315 * provide a unique identifier and nothing more.
316 */
317
318
319static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
320 size_t length, loff_t *ppos)
321{
322 int host, channel, id, lun;
323 char *buffer, *p;
324 int err;
325
326 if (!buf || length > PAGE_SIZE)
327 return -EINVAL;
328
329 buffer = (char *)__get_free_page(GFP_KERNEL);
330 if (!buffer)
331 return -ENOMEM;
332
333 err = -EFAULT;
334 if (copy_from_user(buffer, buf, length))
335 goto out;
336
337 err = -EINVAL;
338 if (length < PAGE_SIZE)
339 buffer[length] = '\0';
340 else if (buffer[PAGE_SIZE-1])
341 goto out;
342
343 /*
344 * Usage: echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi
345 * with "0 1 2 3" replaced by your "Host Channel Id Lun".
346 */
347 if (!strncmp("scsi add-single-device", buffer, 22)) {
348 p = buffer + 23;
349
350 host = simple_strtoul(p, &p, 0);
351 channel = simple_strtoul(p + 1, &p, 0);
352 id = simple_strtoul(p + 1, &p, 0);
353 lun = simple_strtoul(p + 1, &p, 0);
354
355 err = scsi_add_single_device(host, channel, id, lun);
356
357 /*
358 * Usage: echo "scsi remove-single-device 0 1 2 3" >/proc/scsi/scsi
359 * with "0 1 2 3" replaced by your "Host Channel Id Lun".
360 */
361 } else if (!strncmp("scsi remove-single-device", buffer, 25)) {
362 p = buffer + 26;
363
364 host = simple_strtoul(p, &p, 0);
365 channel = simple_strtoul(p + 1, &p, 0);
366 id = simple_strtoul(p + 1, &p, 0);
367 lun = simple_strtoul(p + 1, &p, 0);
368
369 err = scsi_remove_single_device(host, channel, id, lun);
370 }
371
372 /*
373 * convert success returns so that we return the
374 * number of bytes consumed.
375 */
376 if (!err)
377 err = length;
378
379 out:
380 free_page((unsigned long)buffer);
381 return err;
382}
383
384static int always_match(struct device *dev, void *data)
385{
386 return 1;
387}
388
389static inline struct device *next_scsi_device(struct device *start)
390{
391 struct device *next = bus_find_device(&scsi_bus_type, start, NULL,
392 always_match);
393 put_device(start);
394 return next;
395}
396
397static void *scsi_seq_start(struct seq_file *sfile, loff_t *pos)
398{
399 struct device *dev = NULL;
400 loff_t n = *pos;
401
402 while ((dev = next_scsi_device(dev))) {
403 if (!n--)
404 break;
405 sfile->private++;
406 }
407 return dev;
408}
409
410static void *scsi_seq_next(struct seq_file *sfile, void *v, loff_t *pos)
411{
412 (*pos)++;
413 sfile->private++;
414 return next_scsi_device(v);
415}
416
417static void scsi_seq_stop(struct seq_file *sfile, void *v)
418{
419 put_device(v);
420}
421
422static int scsi_seq_show(struct seq_file *sfile, void *dev)
423{
424 if (!sfile->private)
425 seq_puts(sfile, "Attached devices:\n");
426
427 return proc_print_scsidevice(dev, sfile);
428}
429
430static const struct seq_operations scsi_seq_ops = {
431 .start = scsi_seq_start,
432 .next = scsi_seq_next,
433 .stop = scsi_seq_stop,
434 .show = scsi_seq_show
435};
436
437/**
438 * proc_scsi_open - glue function
439 * @inode: not used
440 * @file: passed to single_open()
441 *
442 * Associates proc_scsi_show with this file
443 */
444static int proc_scsi_open(struct inode *inode, struct file *file)
445{
446 /*
447 * We don't really need this for the write case but it doesn't
448 * harm either.
449 */
450 return seq_open(file, &scsi_seq_ops);
451}
452
453static const struct file_operations proc_scsi_operations = {
454 .owner = THIS_MODULE,
455 .open = proc_scsi_open,
456 .read = seq_read,
457 .write = proc_scsi_write,
458 .llseek = seq_lseek,
459 .release = seq_release,
460};
461
462/**
463 * scsi_init_procfs - create scsi and scsi/scsi in procfs
464 */
465int __init scsi_init_procfs(void)
466{
467 struct proc_dir_entry *pde;
468
469 proc_scsi = proc_mkdir("scsi", NULL);
470 if (!proc_scsi)
471 goto err1;
472
473 pde = proc_create("scsi/scsi", 0, NULL, &proc_scsi_operations);
474 if (!pde)
475 goto err2;
476
477 return 0;
478
479err2:
480 remove_proc_entry("scsi", NULL);
481err1:
482 return -ENOMEM;
483}
484
485/**
486 * scsi_exit_procfs - Remove scsi/scsi and scsi from procfs
487 */
488void scsi_exit_procfs(void)
489{
490 remove_proc_entry("scsi/scsi", NULL);
491 remove_proc_entry("scsi", NULL);
492}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/drivers/scsi/scsi_proc.c
4 *
5 * The functions in this file provide an interface between
6 * the PROC file system and the SCSI device drivers
7 * It is mainly used for debugging, statistics and to pass
8 * information directly to the lowlevel driver.
9 *
10 * (c) 1995 Michael Neuffer neuffer@goofy.zdv.uni-mainz.de
11 * Version: 0.99.8 last change: 95/09/13
12 *
13 * generic command parser provided by:
14 * Andreas Heilwagen <crashcar@informatik.uni-koblenz.de>
15 *
16 * generic_proc_info() support of xxxx_info() by:
17 * Michael A. Griffith <grif@acm.org>
18 */
19
20#include <linux/module.h>
21#include <linux/init.h>
22#include <linux/string.h>
23#include <linux/mm.h>
24#include <linux/proc_fs.h>
25#include <linux/errno.h>
26#include <linux/blkdev.h>
27#include <linux/seq_file.h>
28#include <linux/mutex.h>
29#include <linux/gfp.h>
30#include <linux/uaccess.h>
31
32#include <scsi/scsi.h>
33#include <scsi/scsi_device.h>
34#include <scsi/scsi_host.h>
35#include <scsi/scsi_transport.h>
36
37#include "scsi_priv.h"
38#include "scsi_logging.h"
39
40
41/* 4K page size, but our output routines, use some slack for overruns */
42#define PROC_BLOCK_SIZE (3*1024)
43
44static struct proc_dir_entry *proc_scsi;
45
46/* Protects scsi_proc_list */
47static DEFINE_MUTEX(global_host_template_mutex);
48static LIST_HEAD(scsi_proc_list);
49
50/**
51 * struct scsi_proc_entry - (host template, SCSI proc dir) association
52 * @entry: entry in scsi_proc_list.
53 * @sht: SCSI host template associated with the procfs directory.
54 * @proc_dir: procfs directory associated with the SCSI host template.
55 * @present: Number of SCSI hosts instantiated for @sht.
56 */
57struct scsi_proc_entry {
58 struct list_head entry;
59 const struct scsi_host_template *sht;
60 struct proc_dir_entry *proc_dir;
61 unsigned int present;
62};
63
64static ssize_t proc_scsi_host_write(struct file *file, const char __user *buf,
65 size_t count, loff_t *ppos)
66{
67 struct Scsi_Host *shost = pde_data(file_inode(file));
68 ssize_t ret = -ENOMEM;
69 char *page;
70
71 if (count > PROC_BLOCK_SIZE)
72 return -EOVERFLOW;
73
74 if (!shost->hostt->write_info)
75 return -EINVAL;
76
77 page = (char *)__get_free_page(GFP_KERNEL);
78 if (page) {
79 ret = -EFAULT;
80 if (copy_from_user(page, buf, count))
81 goto out;
82 ret = shost->hostt->write_info(shost, page, count);
83 }
84out:
85 free_page((unsigned long)page);
86 return ret;
87}
88
89static int proc_scsi_show(struct seq_file *m, void *v)
90{
91 struct Scsi_Host *shost = m->private;
92 return shost->hostt->show_info(m, shost);
93}
94
95static int proc_scsi_host_open(struct inode *inode, struct file *file)
96{
97 return single_open_size(file, proc_scsi_show, pde_data(inode),
98 4 * PAGE_SIZE);
99}
100
101static struct scsi_proc_entry *
102__scsi_lookup_proc_entry(const struct scsi_host_template *sht)
103{
104 struct scsi_proc_entry *e;
105
106 lockdep_assert_held(&global_host_template_mutex);
107
108 list_for_each_entry(e, &scsi_proc_list, entry)
109 if (e->sht == sht)
110 return e;
111
112 return NULL;
113}
114
115static struct scsi_proc_entry *
116scsi_lookup_proc_entry(const struct scsi_host_template *sht)
117{
118 struct scsi_proc_entry *e;
119
120 mutex_lock(&global_host_template_mutex);
121 e = __scsi_lookup_proc_entry(sht);
122 mutex_unlock(&global_host_template_mutex);
123
124 return e;
125}
126
127/**
128 * scsi_template_proc_dir() - returns the procfs dir for a SCSI host template
129 * @sht: SCSI host template pointer.
130 */
131struct proc_dir_entry *
132scsi_template_proc_dir(const struct scsi_host_template *sht)
133{
134 struct scsi_proc_entry *e = scsi_lookup_proc_entry(sht);
135
136 return e ? e->proc_dir : NULL;
137}
138EXPORT_SYMBOL_GPL(scsi_template_proc_dir);
139
140static const struct proc_ops proc_scsi_ops = {
141 .proc_open = proc_scsi_host_open,
142 .proc_release = single_release,
143 .proc_read = seq_read,
144 .proc_lseek = seq_lseek,
145 .proc_write = proc_scsi_host_write
146};
147
148/**
149 * scsi_proc_hostdir_add - Create directory in /proc for a scsi host
150 * @sht: owner of this directory
151 *
152 * Sets sht->proc_dir to the new directory.
153 */
154int scsi_proc_hostdir_add(const struct scsi_host_template *sht)
155{
156 struct scsi_proc_entry *e;
157 int ret;
158
159 if (!sht->show_info)
160 return 0;
161
162 mutex_lock(&global_host_template_mutex);
163 e = __scsi_lookup_proc_entry(sht);
164 if (!e) {
165 e = kzalloc(sizeof(*e), GFP_KERNEL);
166 if (!e) {
167 ret = -ENOMEM;
168 goto unlock;
169 }
170 }
171 if (e->present++)
172 goto success;
173 e->proc_dir = proc_mkdir(sht->proc_name, proc_scsi);
174 if (!e->proc_dir) {
175 printk(KERN_ERR "%s: proc_mkdir failed for %s\n", __func__,
176 sht->proc_name);
177 ret = -ENOMEM;
178 goto unlock;
179 }
180 e->sht = sht;
181 list_add_tail(&e->entry, &scsi_proc_list);
182success:
183 e = NULL;
184 ret = 0;
185unlock:
186 mutex_unlock(&global_host_template_mutex);
187
188 kfree(e);
189 return ret;
190}
191
192/**
193 * scsi_proc_hostdir_rm - remove directory in /proc for a scsi host
194 * @sht: owner of directory
195 */
196void scsi_proc_hostdir_rm(const struct scsi_host_template *sht)
197{
198 struct scsi_proc_entry *e;
199
200 if (!sht->show_info)
201 return;
202
203 mutex_lock(&global_host_template_mutex);
204 e = __scsi_lookup_proc_entry(sht);
205 if (e && !--e->present) {
206 remove_proc_entry(sht->proc_name, proc_scsi);
207 list_del(&e->entry);
208 kfree(e);
209 }
210 mutex_unlock(&global_host_template_mutex);
211}
212
213
214/**
215 * scsi_proc_host_add - Add entry for this host to appropriate /proc dir
216 * @shost: host to add
217 */
218void scsi_proc_host_add(struct Scsi_Host *shost)
219{
220 const struct scsi_host_template *sht = shost->hostt;
221 struct scsi_proc_entry *e;
222 struct proc_dir_entry *p;
223 char name[10];
224
225 if (!sht->show_info)
226 return;
227
228 e = scsi_lookup_proc_entry(sht);
229 if (!e)
230 goto err;
231
232 sprintf(name,"%d", shost->host_no);
233 p = proc_create_data(name, S_IRUGO | S_IWUSR, e->proc_dir,
234 &proc_scsi_ops, shost);
235 if (!p)
236 goto err;
237 return;
238
239err:
240 shost_printk(KERN_ERR, shost,
241 "%s: Failed to register host (%s failed)\n", __func__,
242 e ? "proc_create_data()" : "scsi_proc_hostdir_add()");
243}
244
245/**
246 * scsi_proc_host_rm - remove this host's entry from /proc
247 * @shost: which host
248 */
249void scsi_proc_host_rm(struct Scsi_Host *shost)
250{
251 const struct scsi_host_template *sht = shost->hostt;
252 struct scsi_proc_entry *e;
253 char name[10];
254
255 if (!sht->show_info)
256 return;
257
258 e = scsi_lookup_proc_entry(sht);
259 if (!e)
260 return;
261
262 sprintf(name,"%d", shost->host_no);
263 remove_proc_entry(name, e->proc_dir);
264}
265/**
266 * proc_print_scsidevice - return data about this host
267 * @dev: A scsi device
268 * @data: &struct seq_file to output to.
269 *
270 * Description: prints Host, Channel, Id, Lun, Vendor, Model, Rev, Type,
271 * and revision.
272 */
273static int proc_print_scsidevice(struct device *dev, void *data)
274{
275 struct scsi_device *sdev;
276 struct seq_file *s = data;
277 int i;
278
279 if (!scsi_is_sdev_device(dev))
280 goto out;
281
282 sdev = to_scsi_device(dev);
283 seq_printf(s,
284 "Host: scsi%d Channel: %02d Id: %02d Lun: %02llu\n Vendor: ",
285 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
286 for (i = 0; i < 8; i++) {
287 if (sdev->vendor[i] >= 0x20)
288 seq_putc(s, sdev->vendor[i]);
289 else
290 seq_putc(s, ' ');
291 }
292
293 seq_puts(s, " Model: ");
294 for (i = 0; i < 16; i++) {
295 if (sdev->model[i] >= 0x20)
296 seq_putc(s, sdev->model[i]);
297 else
298 seq_putc(s, ' ');
299 }
300
301 seq_puts(s, " Rev: ");
302 for (i = 0; i < 4; i++) {
303 if (sdev->rev[i] >= 0x20)
304 seq_putc(s, sdev->rev[i]);
305 else
306 seq_putc(s, ' ');
307 }
308
309 seq_putc(s, '\n');
310
311 seq_printf(s, " Type: %s ", scsi_device_type(sdev->type));
312 seq_printf(s, " ANSI SCSI revision: %02x",
313 sdev->scsi_level - (sdev->scsi_level > 1));
314 if (sdev->scsi_level == 2)
315 seq_puts(s, " CCS\n");
316 else
317 seq_putc(s, '\n');
318
319out:
320 return 0;
321}
322
323/**
324 * scsi_add_single_device - Respond to user request to probe for/add device
325 * @host: user-supplied decimal integer
326 * @channel: user-supplied decimal integer
327 * @id: user-supplied decimal integer
328 * @lun: user-supplied decimal integer
329 *
330 * Description: called by writing "scsi add-single-device" to /proc/scsi/scsi.
331 *
332 * does scsi_host_lookup() and either user_scan() if that transport
333 * type supports it, or else scsi_scan_host_selected()
334 *
335 * Note: this seems to be aimed exclusively at SCSI parallel busses.
336 */
337
338static int scsi_add_single_device(uint host, uint channel, uint id, uint lun)
339{
340 struct Scsi_Host *shost;
341 int error = -ENXIO;
342
343 shost = scsi_host_lookup(host);
344 if (!shost)
345 return error;
346
347 if (shost->transportt->user_scan)
348 error = shost->transportt->user_scan(shost, channel, id, lun);
349 else
350 error = scsi_scan_host_selected(shost, channel, id, lun,
351 SCSI_SCAN_MANUAL);
352 scsi_host_put(shost);
353 return error;
354}
355
356/**
357 * scsi_remove_single_device - Respond to user request to remove a device
358 * @host: user-supplied decimal integer
359 * @channel: user-supplied decimal integer
360 * @id: user-supplied decimal integer
361 * @lun: user-supplied decimal integer
362 *
363 * Description: called by writing "scsi remove-single-device" to
364 * /proc/scsi/scsi. Does a scsi_device_lookup() and scsi_remove_device()
365 */
366static int scsi_remove_single_device(uint host, uint channel, uint id, uint lun)
367{
368 struct scsi_device *sdev;
369 struct Scsi_Host *shost;
370 int error = -ENXIO;
371
372 shost = scsi_host_lookup(host);
373 if (!shost)
374 return error;
375 sdev = scsi_device_lookup(shost, channel, id, lun);
376 if (sdev) {
377 scsi_remove_device(sdev);
378 scsi_device_put(sdev);
379 error = 0;
380 }
381
382 scsi_host_put(shost);
383 return error;
384}
385
386/**
387 * proc_scsi_write - handle writes to /proc/scsi/scsi
388 * @file: not used
389 * @buf: buffer to write
390 * @length: length of buf, at most PAGE_SIZE
391 * @ppos: not used
392 *
393 * Description: this provides a legacy mechanism to add or remove devices by
394 * Host, Channel, ID, and Lun. To use,
395 * "echo 'scsi add-single-device 0 1 2 3' > /proc/scsi/scsi" or
396 * "echo 'scsi remove-single-device 0 1 2 3' > /proc/scsi/scsi" with
397 * "0 1 2 3" replaced by the Host, Channel, Id, and Lun.
398 *
399 * Note: this seems to be aimed at parallel SCSI. Most modern busses (USB,
400 * SATA, Firewire, Fibre Channel, etc) dynamically assign these values to
401 * provide a unique identifier and nothing more.
402 */
403
404
405static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
406 size_t length, loff_t *ppos)
407{
408 int host, channel, id, lun;
409 char *buffer, *end, *p;
410 int err;
411
412 if (!buf || length > PAGE_SIZE)
413 return -EINVAL;
414
415 buffer = (char *)__get_free_page(GFP_KERNEL);
416 if (!buffer)
417 return -ENOMEM;
418
419 err = -EFAULT;
420 if (copy_from_user(buffer, buf, length))
421 goto out;
422
423 err = -EINVAL;
424 if (length < PAGE_SIZE) {
425 end = buffer + length;
426 *end = '\0';
427 } else {
428 end = buffer + PAGE_SIZE - 1;
429 if (*end)
430 goto out;
431 }
432
433 /*
434 * Usage: echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi
435 * with "0 1 2 3" replaced by your "Host Channel Id Lun".
436 */
437 if (!strncmp("scsi add-single-device", buffer, 22)) {
438 p = buffer + 23;
439
440 host = (p < end) ? simple_strtoul(p, &p, 0) : 0;
441 channel = (p + 1 < end) ? simple_strtoul(p + 1, &p, 0) : 0;
442 id = (p + 1 < end) ? simple_strtoul(p + 1, &p, 0) : 0;
443 lun = (p + 1 < end) ? simple_strtoul(p + 1, &p, 0) : 0;
444
445 err = scsi_add_single_device(host, channel, id, lun);
446
447 /*
448 * Usage: echo "scsi remove-single-device 0 1 2 3" >/proc/scsi/scsi
449 * with "0 1 2 3" replaced by your "Host Channel Id Lun".
450 */
451 } else if (!strncmp("scsi remove-single-device", buffer, 25)) {
452 p = buffer + 26;
453
454 host = (p < end) ? simple_strtoul(p, &p, 0) : 0;
455 channel = (p + 1 < end) ? simple_strtoul(p + 1, &p, 0) : 0;
456 id = (p + 1 < end) ? simple_strtoul(p + 1, &p, 0) : 0;
457 lun = (p + 1 < end) ? simple_strtoul(p + 1, &p, 0) : 0;
458
459 err = scsi_remove_single_device(host, channel, id, lun);
460 }
461
462 /*
463 * convert success returns so that we return the
464 * number of bytes consumed.
465 */
466 if (!err)
467 err = length;
468
469 out:
470 free_page((unsigned long)buffer);
471 return err;
472}
473
474static inline struct device *next_scsi_device(struct device *start)
475{
476 struct device *next = bus_find_next_device(&scsi_bus_type, start);
477
478 put_device(start);
479 return next;
480}
481
482static void *scsi_seq_start(struct seq_file *sfile, loff_t *pos)
483{
484 struct device *dev = NULL;
485 loff_t n = *pos;
486
487 while ((dev = next_scsi_device(dev))) {
488 if (!n--)
489 break;
490 sfile->private++;
491 }
492 return dev;
493}
494
495static void *scsi_seq_next(struct seq_file *sfile, void *v, loff_t *pos)
496{
497 (*pos)++;
498 sfile->private++;
499 return next_scsi_device(v);
500}
501
502static void scsi_seq_stop(struct seq_file *sfile, void *v)
503{
504 put_device(v);
505}
506
507static int scsi_seq_show(struct seq_file *sfile, void *dev)
508{
509 if (!sfile->private)
510 seq_puts(sfile, "Attached devices:\n");
511
512 return proc_print_scsidevice(dev, sfile);
513}
514
515static const struct seq_operations scsi_seq_ops = {
516 .start = scsi_seq_start,
517 .next = scsi_seq_next,
518 .stop = scsi_seq_stop,
519 .show = scsi_seq_show
520};
521
522/**
523 * proc_scsi_open - glue function
524 * @inode: not used
525 * @file: passed to single_open()
526 *
527 * Associates proc_scsi_show with this file
528 */
529static int proc_scsi_open(struct inode *inode, struct file *file)
530{
531 /*
532 * We don't really need this for the write case but it doesn't
533 * harm either.
534 */
535 return seq_open(file, &scsi_seq_ops);
536}
537
538static const struct proc_ops scsi_scsi_proc_ops = {
539 .proc_open = proc_scsi_open,
540 .proc_read = seq_read,
541 .proc_write = proc_scsi_write,
542 .proc_lseek = seq_lseek,
543 .proc_release = seq_release,
544};
545
546/**
547 * scsi_init_procfs - create scsi and scsi/scsi in procfs
548 */
549int __init scsi_init_procfs(void)
550{
551 struct proc_dir_entry *pde;
552
553 proc_scsi = proc_mkdir("scsi", NULL);
554 if (!proc_scsi)
555 goto err1;
556
557 pde = proc_create("scsi/scsi", 0, NULL, &scsi_scsi_proc_ops);
558 if (!pde)
559 goto err2;
560
561 return 0;
562
563err2:
564 remove_proc_entry("scsi", NULL);
565err1:
566 return -ENOMEM;
567}
568
569/**
570 * scsi_exit_procfs - Remove scsi/scsi and scsi from procfs
571 */
572void scsi_exit_procfs(void)
573{
574 remove_proc_entry("scsi/scsi", NULL);
575 remove_proc_entry("scsi", NULL);
576}