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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 | |
43 | static struct proc_dir_entry *proc_scsi; |
44 | |
45 | /* Protect sht->present and sht->proc_dir */ |
46 | static 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 | |
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 | |
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 | */ |
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 | |
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 | |
107 | void 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 | */ |
126 | void 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 | */ |
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" |
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 | */ |
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 | } |
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 | */ |
188 | static 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 | |
234 | out: |
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 | |
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); |
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 | */ |
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); |
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 | |
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); |
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 | |
384 | static int always_match(struct device *dev, void *data) |
385 | { |
386 | return 1; |
387 | } |
388 | |
389 | static 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 | |
397 | static 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 | |
410 | static 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 | |
417 | static void scsi_seq_stop(struct seq_file *sfile, void *v) |
418 | { |
419 | put_device(v); |
420 | } |
421 | |
422 | static 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 | |
430 | static 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 | */ |
444 | static 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 | |
453 | static 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 | */ |
465 | int __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 | |
479 | err2: |
480 | remove_proc_entry("scsi", NULL); |
481 | err1: |
482 | return -ENOMEM; |
483 | } |
484 | |
485 | /** |
486 | * scsi_exit_procfs - Remove scsi/scsi and scsi from procfs |
487 | */ |
488 | void scsi_exit_procfs(void) |
489 | { |
490 | remove_proc_entry("scsi/scsi", NULL); |
491 | remove_proc_entry("scsi", NULL); |
492 | } |
493 |
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