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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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/slab.h>
24#include <linux/proc_fs.h>
25#include <linux/errno.h>
26#include <linux/blkdev.h>
27#include <linux/seq_file.h>
Arjan van de Ven0b950672006-01-11 13:16:10 +010028#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <asm/uaccess.h>
30
31#include <scsi/scsi.h>
32#include <scsi/scsi_device.h>
33#include <scsi/scsi_host.h>
Christoph Hellwige02f3f52006-01-13 19:04:00 +010034#include <scsi/scsi_transport.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
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 */
Arjan van de Ven0b950672006-01-11 13:16:10 +010046static DEFINE_MUTEX(global_host_template_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Rob Landleyeb448202007-11-03 13:30:39 -050048/**
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070058static 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
Rob Landleyeb448202007-11-03 13:30:39 -050070/**
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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070077static 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
Rob Landleyeb448202007-11-03 13:30:39 -0500100/**
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107void scsi_proc_hostdir_add(struct scsi_host_template *sht)
108{
109 if (!sht->proc_info)
110 return;
111
Arjan van de Ven0b950672006-01-11 13:16:10 +0100112 mutex_lock(&global_host_template_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 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",
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700117 __func__, sht->proc_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 }
Arjan van de Ven0b950672006-01-11 13:16:10 +0100119 mutex_unlock(&global_host_template_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120}
121
Rob Landleyeb448202007-11-03 13:30:39 -0500122/**
123 * scsi_proc_hostdir_rm - remove directory in /proc for a scsi host
124 * @sht: owner of directory
125 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126void scsi_proc_hostdir_rm(struct scsi_host_template *sht)
127{
128 if (!sht->proc_info)
129 return;
130
Arjan van de Ven0b950672006-01-11 13:16:10 +0100131 mutex_lock(&global_host_template_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 if (!--sht->present && sht->proc_dir) {
133 remove_proc_entry(sht->proc_name, proc_scsi);
134 sht->proc_dir = NULL;
135 }
Arjan van de Ven0b950672006-01-11 13:16:10 +0100136 mutex_unlock(&global_host_template_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137}
138
Rob Landleyeb448202007-11-03 13:30:39 -0500139
140/**
141 * scsi_proc_host_add - Add entry for this host to appropriate /proc dir
142 * @shost: host to add
143 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144void 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"
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700158 "%s\n", __func__, shost->host_no,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 sht->proc_name);
160 return;
161 }
162
163 p->write_proc = proc_scsi_write_proc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164}
165
Rob Landleyeb448202007-11-03 13:30:39 -0500166/**
167 * scsi_proc_host_rm - remove this host's entry from /proc
168 * @shost: which host
169 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170void 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}
Rob Landleyeb448202007-11-03 13:30:39 -0500180/**
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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188static int proc_print_scsidevice(struct device *dev, void *data)
189{
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100190 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 struct seq_file *s = data;
192 int i;
193
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100194 if (!scsi_is_sdev_device(dev))
195 goto out;
196
197 sdev = to_scsi_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 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
Matthew Wilcox4ff36712006-07-04 12:15:20 -0600226 seq_printf(s, " Type: %s ", scsi_device_type(sdev->type));
Alan Stern74feb532007-01-08 11:07:41 -0500227 seq_printf(s, " ANSI SCSI revision: %02x",
228 sdev->scsi_level - (sdev->scsi_level > 1));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 if (sdev->scsi_level == 2)
230 seq_printf(s, " CCS\n");
231 else
232 seq_printf(s, "\n");
233
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100234out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 return 0;
236}
237
Rob Landleyeb448202007-11-03 13:30:39 -0500238/**
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253static 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);
James Smart315cb0a2008-08-07 20:49:30 -0400259 if (!shost)
260 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
Christoph Hellwige02f3f52006-01-13 19:04:00 +0100262 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 scsi_host_put(shost);
267 return error;
268}
269
Rob Landleyeb448202007-11-03 13:30:39 -0500270/**
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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280static 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);
James Smart315cb0a2008-08-07 20:49:30 -0400287 if (!shost)
288 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 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
Rob Landleyeb448202007-11-03 13:30:39 -0500300/**
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319static 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356
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
James Bottomley2ca48a12006-04-27 14:07:49 -0500372 /*
373 * convert success returns so that we return the
374 * number of bytes consumed.
375 */
376 if (!err)
377 err = length;
378
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 out:
380 free_page((unsigned long)buffer);
381 return err;
382}
383
Rob Landleyeb448202007-11-03 13:30:39 -0500384/**
385 * proc_scsi_show - show contents of /proc/scsi/scsi (attached devices)
386 * @s: output goes here
387 * @p: not used
388 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389static int proc_scsi_show(struct seq_file *s, void *p)
390{
391 seq_printf(s, "Attached devices:\n");
392 bus_for_each_dev(&scsi_bus_type, NULL, s, proc_print_scsidevice);
393 return 0;
394}
395
Rob Landleyeb448202007-11-03 13:30:39 -0500396/**
397 * proc_scsi_open - glue function
398 * @inode: not used
399 * @file: passed to single_open()
400 *
401 * Associates proc_scsi_show with this file
402 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403static int proc_scsi_open(struct inode *inode, struct file *file)
404{
405 /*
Rob Landleyeb448202007-11-03 13:30:39 -0500406 * We don't really need this for the write case but it doesn't
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 * harm either.
408 */
409 return single_open(file, proc_scsi_show, NULL);
410}
411
Arjan van de Ven00977a52007-02-12 00:55:34 -0800412static const struct file_operations proc_scsi_operations = {
Denis V. Luneva9739092008-04-29 01:02:17 -0700413 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 .open = proc_scsi_open,
415 .read = seq_read,
416 .write = proc_scsi_write,
417 .llseek = seq_lseek,
418 .release = single_release,
419};
420
Rob Landleyeb448202007-11-03 13:30:39 -0500421/**
422 * scsi_init_procfs - create scsi and scsi/scsi in procfs
423 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424int __init scsi_init_procfs(void)
425{
426 struct proc_dir_entry *pde;
427
428 proc_scsi = proc_mkdir("scsi", NULL);
429 if (!proc_scsi)
430 goto err1;
431
Denis V. Luneva9739092008-04-29 01:02:17 -0700432 pde = proc_create("scsi/scsi", 0, NULL, &proc_scsi_operations);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 if (!pde)
434 goto err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
436 return 0;
437
438err2:
439 remove_proc_entry("scsi", NULL);
440err1:
441 return -ENOMEM;
442}
443
Rob Landleyeb448202007-11-03 13:30:39 -0500444/**
445 * scsi_exit_procfs - Remove scsi/scsi and scsi from procfs
446 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447void scsi_exit_procfs(void)
448{
449 remove_proc_entry("scsi/scsi", NULL);
450 remove_proc_entry("scsi", NULL);
451}