Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
1da177e4 LT |
23 | #include <linux/proc_fs.h> |
24 | #include <linux/errno.h> | |
25 | #include <linux/blkdev.h> | |
26 | #include <linux/seq_file.h> | |
0b950672 | 27 | #include <linux/mutex.h> |
5a0e3ad6 | 28 | #include <linux/gfp.h> |
1da177e4 LT |
29 | #include <asm/uaccess.h> |
30 | ||
31 | #include <scsi/scsi.h> | |
32 | #include <scsi/scsi_device.h> | |
33 | #include <scsi/scsi_host.h> | |
e02f3f59 | 34 | #include <scsi/scsi_transport.h> |
1da177e4 LT |
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 | ||
43 | static struct proc_dir_entry *proc_scsi; | |
44 | ||
45 | /* Protect sht->present and sht->proc_dir */ | |
0b950672 | 46 | static DEFINE_MUTEX(global_host_template_mutex); |
1da177e4 | 47 | |
eb44820c RL |
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 | ||
1da177e4 LT |
58 | static 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 | ||
eb44820c RL |
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 | */ | |
1da177e4 LT |
77 | static 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 | } | |
95 | out: | |
96 | free_page((unsigned long)page); | |
97 | return ret; | |
98 | } | |
99 | ||
eb44820c RL |
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 | ||
1da177e4 LT |
107 | void scsi_proc_hostdir_add(struct scsi_host_template *sht) |
108 | { | |
109 | if (!sht->proc_info) | |
110 | return; | |
111 | ||
0b950672 | 112 | mutex_lock(&global_host_template_mutex); |
1da177e4 LT |
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", | |
cadbd4a5 | 117 | __func__, sht->proc_name); |
1da177e4 | 118 | } |
0b950672 | 119 | mutex_unlock(&global_host_template_mutex); |
1da177e4 LT |
120 | } |
121 | ||
eb44820c RL |
122 | /** |
123 | * scsi_proc_hostdir_rm - remove directory in /proc for a scsi host | |
124 | * @sht: owner of directory | |
125 | */ | |
1da177e4 LT |
126 | void scsi_proc_hostdir_rm(struct scsi_host_template *sht) |
127 | { | |
128 | if (!sht->proc_info) | |
129 | return; | |
130 | ||
0b950672 | 131 | mutex_lock(&global_host_template_mutex); |
1da177e4 LT |
132 | if (!--sht->present && sht->proc_dir) { |
133 | remove_proc_entry(sht->proc_name, proc_scsi); | |
134 | sht->proc_dir = NULL; | |
135 | } | |
0b950672 | 136 | mutex_unlock(&global_host_template_mutex); |
1da177e4 LT |
137 | } |
138 | ||
eb44820c RL |
139 | |
140 | /** | |
141 | * scsi_proc_host_add - Add entry for this host to appropriate /proc dir | |
142 | * @shost: host to add | |
143 | */ | |
1da177e4 LT |
144 | void 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" | |
cadbd4a5 | 158 | "%s\n", __func__, shost->host_no, |
1da177e4 LT |
159 | sht->proc_name); |
160 | return; | |
161 | } | |
162 | ||
163 | p->write_proc = proc_scsi_write_proc; | |
1da177e4 LT |
164 | } |
165 | ||
eb44820c RL |
166 | /** |
167 | * scsi_proc_host_rm - remove this host's entry from /proc | |
168 | * @shost: which host | |
169 | */ | |
1da177e4 LT |
170 | void 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 | } | |
eb44820c RL |
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 | */ | |
1da177e4 LT |
188 | static int proc_print_scsidevice(struct device *dev, void *data) |
189 | { | |
b0ed4336 | 190 | struct scsi_device *sdev; |
1da177e4 LT |
191 | struct seq_file *s = data; |
192 | int i; | |
193 | ||
b0ed4336 HR |
194 | if (!scsi_is_sdev_device(dev)) |
195 | goto out; | |
196 | ||
197 | sdev = to_scsi_device(dev); | |
1da177e4 LT |
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 | ||
4ff36718 | 226 | seq_printf(s, " Type: %s ", scsi_device_type(sdev->type)); |
74feb53e AS |
227 | seq_printf(s, " ANSI SCSI revision: %02x", |
228 | sdev->scsi_level - (sdev->scsi_level > 1)); | |
1da177e4 LT |
229 | if (sdev->scsi_level == 2) |
230 | seq_printf(s, " CCS\n"); | |
231 | else | |
232 | seq_printf(s, "\n"); | |
233 | ||
b0ed4336 | 234 | out: |
1da177e4 LT |
235 | return 0; |
236 | } | |
237 | ||
eb44820c RL |
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 | ||
1da177e4 LT |
253 | static 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); | |
315cb0ad JS |
259 | if (!shost) |
260 | return error; | |
1da177e4 | 261 | |
e02f3f59 CH |
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); | |
1da177e4 LT |
266 | scsi_host_put(shost); |
267 | return error; | |
268 | } | |
269 | ||
eb44820c RL |
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 | */ | |
1da177e4 LT |
280 | static 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); | |
315cb0ad JS |
287 | if (!shost) |
288 | return error; | |
1da177e4 LT |
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 | ||
eb44820c RL |
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 | ||
1da177e4 LT |
319 | static 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); | |
1da177e4 LT |
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 | ||
2ca48a13 JB |
372 | /* |
373 | * convert success returns so that we return the | |
374 | * number of bytes consumed. | |
375 | */ | |
376 | if (!err) | |
377 | err = length; | |
378 | ||
1da177e4 LT |
379 | out: |
380 | free_page((unsigned long)buffer); | |
381 | return err; | |
382 | } | |
383 | ||
eb44820c RL |
384 | /** |
385 | * proc_scsi_show - show contents of /proc/scsi/scsi (attached devices) | |
386 | * @s: output goes here | |
387 | * @p: not used | |
388 | */ | |
1da177e4 LT |
389 | static 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 | ||
eb44820c RL |
396 | /** |
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 | */ | |
1da177e4 LT |
403 | static int proc_scsi_open(struct inode *inode, struct file *file) |
404 | { | |
405 | /* | |
eb44820c | 406 | * We don't really need this for the write case but it doesn't |
1da177e4 LT |
407 | * harm either. |
408 | */ | |
409 | return single_open(file, proc_scsi_show, NULL); | |
410 | } | |
411 | ||
00977a59 | 412 | static const struct file_operations proc_scsi_operations = { |
a973909f | 413 | .owner = THIS_MODULE, |
1da177e4 LT |
414 | .open = proc_scsi_open, |
415 | .read = seq_read, | |
416 | .write = proc_scsi_write, | |
417 | .llseek = seq_lseek, | |
418 | .release = single_release, | |
419 | }; | |
420 | ||
eb44820c RL |
421 | /** |
422 | * scsi_init_procfs - create scsi and scsi/scsi in procfs | |
423 | */ | |
1da177e4 LT |
424 | int __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 | ||
a973909f | 432 | pde = proc_create("scsi/scsi", 0, NULL, &proc_scsi_operations); |
1da177e4 LT |
433 | if (!pde) |
434 | goto err2; | |
1da177e4 LT |
435 | |
436 | return 0; | |
437 | ||
438 | err2: | |
439 | remove_proc_entry("scsi", NULL); | |
440 | err1: | |
441 | return -ENOMEM; | |
442 | } | |
443 | ||
eb44820c RL |
444 | /** |
445 | * scsi_exit_procfs - Remove scsi/scsi and scsi from procfs | |
446 | */ | |
1da177e4 LT |
447 | void scsi_exit_procfs(void) |
448 | { | |
449 | remove_proc_entry("scsi/scsi", NULL); | |
450 | remove_proc_entry("scsi", NULL); | |
451 | } |