Root/
1 | /* |
2 | * scsi_scan.c |
3 | * |
4 | * Copyright (C) 2000 Eric Youngdale, |
5 | * Copyright (C) 2002 Patrick Mansfield |
6 | * |
7 | * The general scanning/probing algorithm is as follows, exceptions are |
8 | * made to it depending on device specific flags, compilation options, and |
9 | * global variable (boot or module load time) settings. |
10 | * |
11 | * A specific LUN is scanned via an INQUIRY command; if the LUN has a |
12 | * device attached, a scsi_device is allocated and setup for it. |
13 | * |
14 | * For every id of every channel on the given host: |
15 | * |
16 | * Scan LUN 0; if the target responds to LUN 0 (even if there is no |
17 | * device or storage attached to LUN 0): |
18 | * |
19 | * If LUN 0 has a device attached, allocate and setup a |
20 | * scsi_device for it. |
21 | * |
22 | * If target is SCSI-3 or up, issue a REPORT LUN, and scan |
23 | * all of the LUNs returned by the REPORT LUN; else, |
24 | * sequentially scan LUNs up until some maximum is reached, |
25 | * or a LUN is seen that cannot have a device attached to it. |
26 | */ |
27 | |
28 | #include <linux/module.h> |
29 | #include <linux/moduleparam.h> |
30 | #include <linux/init.h> |
31 | #include <linux/blkdev.h> |
32 | #include <linux/delay.h> |
33 | #include <linux/kthread.h> |
34 | #include <linux/spinlock.h> |
35 | #include <linux/async.h> |
36 | #include <linux/slab.h> |
37 | |
38 | #include <scsi/scsi.h> |
39 | #include <scsi/scsi_cmnd.h> |
40 | #include <scsi/scsi_device.h> |
41 | #include <scsi/scsi_driver.h> |
42 | #include <scsi/scsi_devinfo.h> |
43 | #include <scsi/scsi_host.h> |
44 | #include <scsi/scsi_transport.h> |
45 | #include <scsi/scsi_eh.h> |
46 | |
47 | #include "scsi_priv.h" |
48 | #include "scsi_logging.h" |
49 | |
50 | #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \ |
51 | " SCSI scanning, some SCSI devices might not be configured\n" |
52 | |
53 | /* |
54 | * Default timeout |
55 | */ |
56 | #define SCSI_TIMEOUT (2*HZ) |
57 | |
58 | /* |
59 | * Prefix values for the SCSI id's (stored in sysfs name field) |
60 | */ |
61 | #define SCSI_UID_SER_NUM 'S' |
62 | #define SCSI_UID_UNKNOWN 'Z' |
63 | |
64 | /* |
65 | * Return values of some of the scanning functions. |
66 | * |
67 | * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this |
68 | * includes allocation or general failures preventing IO from being sent. |
69 | * |
70 | * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available |
71 | * on the given LUN. |
72 | * |
73 | * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a |
74 | * given LUN. |
75 | */ |
76 | #define SCSI_SCAN_NO_RESPONSE 0 |
77 | #define SCSI_SCAN_TARGET_PRESENT 1 |
78 | #define SCSI_SCAN_LUN_PRESENT 2 |
79 | |
80 | static const char *scsi_null_device_strs = "nullnullnullnull"; |
81 | |
82 | #define MAX_SCSI_LUNS 512 |
83 | |
84 | #ifdef CONFIG_SCSI_MULTI_LUN |
85 | static unsigned int max_scsi_luns = MAX_SCSI_LUNS; |
86 | #else |
87 | static unsigned int max_scsi_luns = 1; |
88 | #endif |
89 | |
90 | module_param_named(max_luns, max_scsi_luns, uint, S_IRUGO|S_IWUSR); |
91 | MODULE_PARM_DESC(max_luns, |
92 | "last scsi LUN (should be between 1 and 2^32-1)"); |
93 | |
94 | #ifdef CONFIG_SCSI_SCAN_ASYNC |
95 | #define SCSI_SCAN_TYPE_DEFAULT "async" |
96 | #else |
97 | #define SCSI_SCAN_TYPE_DEFAULT "sync" |
98 | #endif |
99 | |
100 | static char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT; |
101 | |
102 | module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO); |
103 | MODULE_PARM_DESC(scan, "sync, async or none"); |
104 | |
105 | /* |
106 | * max_scsi_report_luns: the maximum number of LUNS that will be |
107 | * returned from the REPORT LUNS command. 8 times this value must |
108 | * be allocated. In theory this could be up to an 8 byte value, but |
109 | * in practice, the maximum number of LUNs suppored by any device |
110 | * is about 16k. |
111 | */ |
112 | static unsigned int max_scsi_report_luns = 511; |
113 | |
114 | module_param_named(max_report_luns, max_scsi_report_luns, uint, S_IRUGO|S_IWUSR); |
115 | MODULE_PARM_DESC(max_report_luns, |
116 | "REPORT LUNS maximum number of LUNS received (should be" |
117 | " between 1 and 16384)"); |
118 | |
119 | static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ + 18; |
120 | |
121 | module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR); |
122 | MODULE_PARM_DESC(inq_timeout, |
123 | "Timeout (in seconds) waiting for devices to answer INQUIRY." |
124 | " Default is 20. Some devices may need more; most need less."); |
125 | |
126 | /* This lock protects only this list */ |
127 | static DEFINE_SPINLOCK(async_scan_lock); |
128 | static LIST_HEAD(scanning_hosts); |
129 | |
130 | struct async_scan_data { |
131 | struct list_head list; |
132 | struct Scsi_Host *shost; |
133 | struct completion prev_finished; |
134 | }; |
135 | |
136 | /** |
137 | * scsi_complete_async_scans - Wait for asynchronous scans to complete |
138 | * |
139 | * When this function returns, any host which started scanning before |
140 | * this function was called will have finished its scan. Hosts which |
141 | * started scanning after this function was called may or may not have |
142 | * finished. |
143 | */ |
144 | int scsi_complete_async_scans(void) |
145 | { |
146 | struct async_scan_data *data; |
147 | |
148 | do { |
149 | if (list_empty(&scanning_hosts)) |
150 | return 0; |
151 | /* If we can't get memory immediately, that's OK. Just |
152 | * sleep a little. Even if we never get memory, the async |
153 | * scans will finish eventually. |
154 | */ |
155 | data = kmalloc(sizeof(*data), GFP_KERNEL); |
156 | if (!data) |
157 | msleep(1); |
158 | } while (!data); |
159 | |
160 | data->shost = NULL; |
161 | init_completion(&data->prev_finished); |
162 | |
163 | spin_lock(&async_scan_lock); |
164 | /* Check that there's still somebody else on the list */ |
165 | if (list_empty(&scanning_hosts)) |
166 | goto done; |
167 | list_add_tail(&data->list, &scanning_hosts); |
168 | spin_unlock(&async_scan_lock); |
169 | |
170 | printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n"); |
171 | wait_for_completion(&data->prev_finished); |
172 | |
173 | spin_lock(&async_scan_lock); |
174 | list_del(&data->list); |
175 | if (!list_empty(&scanning_hosts)) { |
176 | struct async_scan_data *next = list_entry(scanning_hosts.next, |
177 | struct async_scan_data, list); |
178 | complete(&next->prev_finished); |
179 | } |
180 | done: |
181 | spin_unlock(&async_scan_lock); |
182 | |
183 | kfree(data); |
184 | return 0; |
185 | } |
186 | |
187 | /* Only exported for the benefit of scsi_wait_scan */ |
188 | EXPORT_SYMBOL_GPL(scsi_complete_async_scans); |
189 | |
190 | #ifndef MODULE |
191 | /* |
192 | * For async scanning we need to wait for all the scans to complete before |
193 | * trying to mount the root fs. Otherwise non-modular drivers may not be ready |
194 | * yet. |
195 | */ |
196 | late_initcall(scsi_complete_async_scans); |
197 | #endif |
198 | |
199 | /** |
200 | * scsi_unlock_floptical - unlock device via a special MODE SENSE command |
201 | * @sdev: scsi device to send command to |
202 | * @result: area to store the result of the MODE SENSE |
203 | * |
204 | * Description: |
205 | * Send a vendor specific MODE SENSE (not a MODE SELECT) command. |
206 | * Called for BLIST_KEY devices. |
207 | **/ |
208 | static void scsi_unlock_floptical(struct scsi_device *sdev, |
209 | unsigned char *result) |
210 | { |
211 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
212 | |
213 | printk(KERN_NOTICE "scsi: unlocking floptical drive\n"); |
214 | scsi_cmd[0] = MODE_SENSE; |
215 | scsi_cmd[1] = 0; |
216 | scsi_cmd[2] = 0x2e; |
217 | scsi_cmd[3] = 0; |
218 | scsi_cmd[4] = 0x2a; /* size */ |
219 | scsi_cmd[5] = 0; |
220 | scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL, |
221 | SCSI_TIMEOUT, 3, NULL); |
222 | } |
223 | |
224 | /** |
225 | * scsi_alloc_sdev - allocate and setup a scsi_Device |
226 | * @starget: which target to allocate a &scsi_device for |
227 | * @lun: which lun |
228 | * @hostdata: usually NULL and set by ->slave_alloc instead |
229 | * |
230 | * Description: |
231 | * Allocate, initialize for io, and return a pointer to a scsi_Device. |
232 | * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and |
233 | * adds scsi_Device to the appropriate list. |
234 | * |
235 | * Return value: |
236 | * scsi_Device pointer, or NULL on failure. |
237 | **/ |
238 | static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, |
239 | unsigned int lun, void *hostdata) |
240 | { |
241 | struct scsi_device *sdev; |
242 | int display_failure_msg = 1, ret; |
243 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
244 | extern void scsi_evt_thread(struct work_struct *work); |
245 | |
246 | sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size, |
247 | GFP_ATOMIC); |
248 | if (!sdev) |
249 | goto out; |
250 | |
251 | sdev->vendor = scsi_null_device_strs; |
252 | sdev->model = scsi_null_device_strs; |
253 | sdev->rev = scsi_null_device_strs; |
254 | sdev->host = shost; |
255 | sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD; |
256 | sdev->id = starget->id; |
257 | sdev->lun = lun; |
258 | sdev->channel = starget->channel; |
259 | sdev->sdev_state = SDEV_CREATED; |
260 | INIT_LIST_HEAD(&sdev->siblings); |
261 | INIT_LIST_HEAD(&sdev->same_target_siblings); |
262 | INIT_LIST_HEAD(&sdev->cmd_list); |
263 | INIT_LIST_HEAD(&sdev->starved_entry); |
264 | INIT_LIST_HEAD(&sdev->event_list); |
265 | spin_lock_init(&sdev->list_lock); |
266 | INIT_WORK(&sdev->event_work, scsi_evt_thread); |
267 | |
268 | sdev->sdev_gendev.parent = get_device(&starget->dev); |
269 | sdev->sdev_target = starget; |
270 | |
271 | /* usually NULL and set by ->slave_alloc instead */ |
272 | sdev->hostdata = hostdata; |
273 | |
274 | /* if the device needs this changing, it may do so in the |
275 | * slave_configure function */ |
276 | sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED; |
277 | |
278 | /* |
279 | * Some low level driver could use device->type |
280 | */ |
281 | sdev->type = -1; |
282 | |
283 | /* |
284 | * Assume that the device will have handshaking problems, |
285 | * and then fix this field later if it turns out it |
286 | * doesn't |
287 | */ |
288 | sdev->borken = 1; |
289 | |
290 | sdev->request_queue = scsi_alloc_queue(sdev); |
291 | if (!sdev->request_queue) { |
292 | /* release fn is set up in scsi_sysfs_device_initialise, so |
293 | * have to free and put manually here */ |
294 | put_device(&starget->dev); |
295 | kfree(sdev); |
296 | goto out; |
297 | } |
298 | |
299 | sdev->request_queue->queuedata = sdev; |
300 | scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun); |
301 | |
302 | scsi_sysfs_device_initialize(sdev); |
303 | |
304 | if (shost->hostt->slave_alloc) { |
305 | ret = shost->hostt->slave_alloc(sdev); |
306 | if (ret) { |
307 | /* |
308 | * if LLDD reports slave not present, don't clutter |
309 | * console with alloc failure messages |
310 | */ |
311 | if (ret == -ENXIO) |
312 | display_failure_msg = 0; |
313 | goto out_device_destroy; |
314 | } |
315 | } |
316 | |
317 | return sdev; |
318 | |
319 | out_device_destroy: |
320 | scsi_device_set_state(sdev, SDEV_DEL); |
321 | transport_destroy_device(&sdev->sdev_gendev); |
322 | put_device(&sdev->sdev_dev); |
323 | put_device(&sdev->sdev_gendev); |
324 | out: |
325 | if (display_failure_msg) |
326 | printk(ALLOC_FAILURE_MSG, __func__); |
327 | return NULL; |
328 | } |
329 | |
330 | static void scsi_target_destroy(struct scsi_target *starget) |
331 | { |
332 | struct device *dev = &starget->dev; |
333 | struct Scsi_Host *shost = dev_to_shost(dev->parent); |
334 | unsigned long flags; |
335 | |
336 | transport_destroy_device(dev); |
337 | spin_lock_irqsave(shost->host_lock, flags); |
338 | if (shost->hostt->target_destroy) |
339 | shost->hostt->target_destroy(starget); |
340 | list_del_init(&starget->siblings); |
341 | spin_unlock_irqrestore(shost->host_lock, flags); |
342 | put_device(dev); |
343 | } |
344 | |
345 | static void scsi_target_dev_release(struct device *dev) |
346 | { |
347 | struct device *parent = dev->parent; |
348 | struct scsi_target *starget = to_scsi_target(dev); |
349 | |
350 | kfree(starget); |
351 | put_device(parent); |
352 | } |
353 | |
354 | static struct device_type scsi_target_type = { |
355 | .name = "scsi_target", |
356 | .release = scsi_target_dev_release, |
357 | }; |
358 | |
359 | int scsi_is_target_device(const struct device *dev) |
360 | { |
361 | return dev->type == &scsi_target_type; |
362 | } |
363 | EXPORT_SYMBOL(scsi_is_target_device); |
364 | |
365 | static struct scsi_target *__scsi_find_target(struct device *parent, |
366 | int channel, uint id) |
367 | { |
368 | struct scsi_target *starget, *found_starget = NULL; |
369 | struct Scsi_Host *shost = dev_to_shost(parent); |
370 | /* |
371 | * Search for an existing target for this sdev. |
372 | */ |
373 | list_for_each_entry(starget, &shost->__targets, siblings) { |
374 | if (starget->id == id && |
375 | starget->channel == channel) { |
376 | found_starget = starget; |
377 | break; |
378 | } |
379 | } |
380 | if (found_starget) |
381 | get_device(&found_starget->dev); |
382 | |
383 | return found_starget; |
384 | } |
385 | |
386 | /** |
387 | * scsi_alloc_target - allocate a new or find an existing target |
388 | * @parent: parent of the target (need not be a scsi host) |
389 | * @channel: target channel number (zero if no channels) |
390 | * @id: target id number |
391 | * |
392 | * Return an existing target if one exists, provided it hasn't already |
393 | * gone into STARGET_DEL state, otherwise allocate a new target. |
394 | * |
395 | * The target is returned with an incremented reference, so the caller |
396 | * is responsible for both reaping and doing a last put |
397 | */ |
398 | static struct scsi_target *scsi_alloc_target(struct device *parent, |
399 | int channel, uint id) |
400 | { |
401 | struct Scsi_Host *shost = dev_to_shost(parent); |
402 | struct device *dev = NULL; |
403 | unsigned long flags; |
404 | const int size = sizeof(struct scsi_target) |
405 | + shost->transportt->target_size; |
406 | struct scsi_target *starget; |
407 | struct scsi_target *found_target; |
408 | int error; |
409 | |
410 | starget = kzalloc(size, GFP_KERNEL); |
411 | if (!starget) { |
412 | printk(KERN_ERR "%s: allocation failure\n", __func__); |
413 | return NULL; |
414 | } |
415 | dev = &starget->dev; |
416 | device_initialize(dev); |
417 | starget->reap_ref = 1; |
418 | dev->parent = get_device(parent); |
419 | dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id); |
420 | #ifndef CONFIG_SYSFS_DEPRECATED |
421 | dev->bus = &scsi_bus_type; |
422 | #endif |
423 | dev->type = &scsi_target_type; |
424 | starget->id = id; |
425 | starget->channel = channel; |
426 | starget->can_queue = 0; |
427 | INIT_LIST_HEAD(&starget->siblings); |
428 | INIT_LIST_HEAD(&starget->devices); |
429 | starget->state = STARGET_CREATED; |
430 | starget->scsi_level = SCSI_2; |
431 | starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED; |
432 | retry: |
433 | spin_lock_irqsave(shost->host_lock, flags); |
434 | |
435 | found_target = __scsi_find_target(parent, channel, id); |
436 | if (found_target) |
437 | goto found; |
438 | |
439 | list_add_tail(&starget->siblings, &shost->__targets); |
440 | spin_unlock_irqrestore(shost->host_lock, flags); |
441 | /* allocate and add */ |
442 | transport_setup_device(dev); |
443 | if (shost->hostt->target_alloc) { |
444 | error = shost->hostt->target_alloc(starget); |
445 | |
446 | if(error) { |
447 | dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error); |
448 | /* don't want scsi_target_reap to do the final |
449 | * put because it will be under the host lock */ |
450 | scsi_target_destroy(starget); |
451 | return NULL; |
452 | } |
453 | } |
454 | get_device(dev); |
455 | |
456 | return starget; |
457 | |
458 | found: |
459 | found_target->reap_ref++; |
460 | spin_unlock_irqrestore(shost->host_lock, flags); |
461 | if (found_target->state != STARGET_DEL) { |
462 | put_device(parent); |
463 | kfree(starget); |
464 | return found_target; |
465 | } |
466 | /* Unfortunately, we found a dying target; need to |
467 | * wait until it's dead before we can get a new one */ |
468 | put_device(&found_target->dev); |
469 | flush_scheduled_work(); |
470 | goto retry; |
471 | } |
472 | |
473 | static void scsi_target_reap_usercontext(struct work_struct *work) |
474 | { |
475 | struct scsi_target *starget = |
476 | container_of(work, struct scsi_target, ew.work); |
477 | |
478 | transport_remove_device(&starget->dev); |
479 | device_del(&starget->dev); |
480 | scsi_target_destroy(starget); |
481 | } |
482 | |
483 | /** |
484 | * scsi_target_reap - check to see if target is in use and destroy if not |
485 | * @starget: target to be checked |
486 | * |
487 | * This is used after removing a LUN or doing a last put of the target |
488 | * it checks atomically that nothing is using the target and removes |
489 | * it if so. |
490 | */ |
491 | void scsi_target_reap(struct scsi_target *starget) |
492 | { |
493 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
494 | unsigned long flags; |
495 | enum scsi_target_state state; |
496 | int empty; |
497 | |
498 | spin_lock_irqsave(shost->host_lock, flags); |
499 | state = starget->state; |
500 | empty = --starget->reap_ref == 0 && |
501 | list_empty(&starget->devices) ? 1 : 0; |
502 | spin_unlock_irqrestore(shost->host_lock, flags); |
503 | |
504 | if (!empty) |
505 | return; |
506 | |
507 | BUG_ON(state == STARGET_DEL); |
508 | starget->state = STARGET_DEL; |
509 | if (state == STARGET_CREATED) |
510 | scsi_target_destroy(starget); |
511 | else |
512 | execute_in_process_context(scsi_target_reap_usercontext, |
513 | &starget->ew); |
514 | } |
515 | |
516 | /** |
517 | * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string |
518 | * @s: INQUIRY result string to sanitize |
519 | * @len: length of the string |
520 | * |
521 | * Description: |
522 | * The SCSI spec says that INQUIRY vendor, product, and revision |
523 | * strings must consist entirely of graphic ASCII characters, |
524 | * padded on the right with spaces. Since not all devices obey |
525 | * this rule, we will replace non-graphic or non-ASCII characters |
526 | * with spaces. Exception: a NUL character is interpreted as a |
527 | * string terminator, so all the following characters are set to |
528 | * spaces. |
529 | **/ |
530 | static void sanitize_inquiry_string(unsigned char *s, int len) |
531 | { |
532 | int terminated = 0; |
533 | |
534 | for (; len > 0; (--len, ++s)) { |
535 | if (*s == 0) |
536 | terminated = 1; |
537 | if (terminated || *s < 0x20 || *s > 0x7e) |
538 | *s = ' '; |
539 | } |
540 | } |
541 | |
542 | /** |
543 | * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY |
544 | * @sdev: scsi_device to probe |
545 | * @inq_result: area to store the INQUIRY result |
546 | * @result_len: len of inq_result |
547 | * @bflags: store any bflags found here |
548 | * |
549 | * Description: |
550 | * Probe the lun associated with @req using a standard SCSI INQUIRY; |
551 | * |
552 | * If the INQUIRY is successful, zero is returned and the |
553 | * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length |
554 | * are copied to the scsi_device any flags value is stored in *@bflags. |
555 | **/ |
556 | static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result, |
557 | int result_len, int *bflags) |
558 | { |
559 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
560 | int first_inquiry_len, try_inquiry_len, next_inquiry_len; |
561 | int response_len = 0; |
562 | int pass, count, result; |
563 | struct scsi_sense_hdr sshdr; |
564 | |
565 | *bflags = 0; |
566 | |
567 | /* Perform up to 3 passes. The first pass uses a conservative |
568 | * transfer length of 36 unless sdev->inquiry_len specifies a |
569 | * different value. */ |
570 | first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36; |
571 | try_inquiry_len = first_inquiry_len; |
572 | pass = 1; |
573 | |
574 | next_pass: |
575 | SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
576 | "scsi scan: INQUIRY pass %d length %d\n", |
577 | pass, try_inquiry_len)); |
578 | |
579 | /* Each pass gets up to three chances to ignore Unit Attention */ |
580 | for (count = 0; count < 3; ++count) { |
581 | int resid; |
582 | |
583 | memset(scsi_cmd, 0, 6); |
584 | scsi_cmd[0] = INQUIRY; |
585 | scsi_cmd[4] = (unsigned char) try_inquiry_len; |
586 | |
587 | memset(inq_result, 0, try_inquiry_len); |
588 | |
589 | result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, |
590 | inq_result, try_inquiry_len, &sshdr, |
591 | HZ / 2 + HZ * scsi_inq_timeout, 3, |
592 | &resid); |
593 | |
594 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s " |
595 | "with code 0x%x\n", |
596 | result ? "failed" : "successful", result)); |
597 | |
598 | if (result) { |
599 | /* |
600 | * not-ready to ready transition [asc/ascq=0x28/0x0] |
601 | * or power-on, reset [asc/ascq=0x29/0x0], continue. |
602 | * INQUIRY should not yield UNIT_ATTENTION |
603 | * but many buggy devices do so anyway. |
604 | */ |
605 | if ((driver_byte(result) & DRIVER_SENSE) && |
606 | scsi_sense_valid(&sshdr)) { |
607 | if ((sshdr.sense_key == UNIT_ATTENTION) && |
608 | ((sshdr.asc == 0x28) || |
609 | (sshdr.asc == 0x29)) && |
610 | (sshdr.ascq == 0)) |
611 | continue; |
612 | } |
613 | } else { |
614 | /* |
615 | * if nothing was transferred, we try |
616 | * again. It's a workaround for some USB |
617 | * devices. |
618 | */ |
619 | if (resid == try_inquiry_len) |
620 | continue; |
621 | } |
622 | break; |
623 | } |
624 | |
625 | if (result == 0) { |
626 | sanitize_inquiry_string(&inq_result[8], 8); |
627 | sanitize_inquiry_string(&inq_result[16], 16); |
628 | sanitize_inquiry_string(&inq_result[32], 4); |
629 | |
630 | response_len = inq_result[4] + 5; |
631 | if (response_len > 255) |
632 | response_len = first_inquiry_len; /* sanity */ |
633 | |
634 | /* |
635 | * Get any flags for this device. |
636 | * |
637 | * XXX add a bflags to scsi_device, and replace the |
638 | * corresponding bit fields in scsi_device, so bflags |
639 | * need not be passed as an argument. |
640 | */ |
641 | *bflags = scsi_get_device_flags(sdev, &inq_result[8], |
642 | &inq_result[16]); |
643 | |
644 | /* When the first pass succeeds we gain information about |
645 | * what larger transfer lengths might work. */ |
646 | if (pass == 1) { |
647 | if (BLIST_INQUIRY_36 & *bflags) |
648 | next_inquiry_len = 36; |
649 | else if (BLIST_INQUIRY_58 & *bflags) |
650 | next_inquiry_len = 58; |
651 | else if (sdev->inquiry_len) |
652 | next_inquiry_len = sdev->inquiry_len; |
653 | else |
654 | next_inquiry_len = response_len; |
655 | |
656 | /* If more data is available perform the second pass */ |
657 | if (next_inquiry_len > try_inquiry_len) { |
658 | try_inquiry_len = next_inquiry_len; |
659 | pass = 2; |
660 | goto next_pass; |
661 | } |
662 | } |
663 | |
664 | } else if (pass == 2) { |
665 | printk(KERN_INFO "scsi scan: %d byte inquiry failed. " |
666 | "Consider BLIST_INQUIRY_36 for this device\n", |
667 | try_inquiry_len); |
668 | |
669 | /* If this pass failed, the third pass goes back and transfers |
670 | * the same amount as we successfully got in the first pass. */ |
671 | try_inquiry_len = first_inquiry_len; |
672 | pass = 3; |
673 | goto next_pass; |
674 | } |
675 | |
676 | /* If the last transfer attempt got an error, assume the |
677 | * peripheral doesn't exist or is dead. */ |
678 | if (result) |
679 | return -EIO; |
680 | |
681 | /* Don't report any more data than the device says is valid */ |
682 | sdev->inquiry_len = min(try_inquiry_len, response_len); |
683 | |
684 | /* |
685 | * XXX Abort if the response length is less than 36? If less than |
686 | * 32, the lookup of the device flags (above) could be invalid, |
687 | * and it would be possible to take an incorrect action - we do |
688 | * not want to hang because of a short INQUIRY. On the flip side, |
689 | * if the device is spun down or becoming ready (and so it gives a |
690 | * short INQUIRY), an abort here prevents any further use of the |
691 | * device, including spin up. |
692 | * |
693 | * On the whole, the best approach seems to be to assume the first |
694 | * 36 bytes are valid no matter what the device says. That's |
695 | * better than copying < 36 bytes to the inquiry-result buffer |
696 | * and displaying garbage for the Vendor, Product, or Revision |
697 | * strings. |
698 | */ |
699 | if (sdev->inquiry_len < 36) { |
700 | printk(KERN_INFO "scsi scan: INQUIRY result too short (%d)," |
701 | " using 36\n", sdev->inquiry_len); |
702 | sdev->inquiry_len = 36; |
703 | } |
704 | |
705 | /* |
706 | * Related to the above issue: |
707 | * |
708 | * XXX Devices (disk or all?) should be sent a TEST UNIT READY, |
709 | * and if not ready, sent a START_STOP to start (maybe spin up) and |
710 | * then send the INQUIRY again, since the INQUIRY can change after |
711 | * a device is initialized. |
712 | * |
713 | * Ideally, start a device if explicitly asked to do so. This |
714 | * assumes that a device is spun up on power on, spun down on |
715 | * request, and then spun up on request. |
716 | */ |
717 | |
718 | /* |
719 | * The scanning code needs to know the scsi_level, even if no |
720 | * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so |
721 | * non-zero LUNs can be scanned. |
722 | */ |
723 | sdev->scsi_level = inq_result[2] & 0x07; |
724 | if (sdev->scsi_level >= 2 || |
725 | (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1)) |
726 | sdev->scsi_level++; |
727 | sdev->sdev_target->scsi_level = sdev->scsi_level; |
728 | |
729 | return 0; |
730 | } |
731 | |
732 | /** |
733 | * scsi_add_lun - allocate and fully initialze a scsi_device |
734 | * @sdev: holds information to be stored in the new scsi_device |
735 | * @inq_result: holds the result of a previous INQUIRY to the LUN |
736 | * @bflags: black/white list flag |
737 | * @async: 1 if this device is being scanned asynchronously |
738 | * |
739 | * Description: |
740 | * Initialize the scsi_device @sdev. Optionally set fields based |
741 | * on values in *@bflags. |
742 | * |
743 | * Return: |
744 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device |
745 | * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized |
746 | **/ |
747 | static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, |
748 | int *bflags, int async) |
749 | { |
750 | int ret; |
751 | |
752 | /* |
753 | * XXX do not save the inquiry, since it can change underneath us, |
754 | * save just vendor/model/rev. |
755 | * |
756 | * Rather than save it and have an ioctl that retrieves the saved |
757 | * value, have an ioctl that executes the same INQUIRY code used |
758 | * in scsi_probe_lun, let user level programs doing INQUIRY |
759 | * scanning run at their own risk, or supply a user level program |
760 | * that can correctly scan. |
761 | */ |
762 | |
763 | /* |
764 | * Copy at least 36 bytes of INQUIRY data, so that we don't |
765 | * dereference unallocated memory when accessing the Vendor, |
766 | * Product, and Revision strings. Badly behaved devices may set |
767 | * the INQUIRY Additional Length byte to a small value, indicating |
768 | * these strings are invalid, but often they contain plausible data |
769 | * nonetheless. It doesn't matter if the device sent < 36 bytes |
770 | * total, since scsi_probe_lun() initializes inq_result with 0s. |
771 | */ |
772 | sdev->inquiry = kmemdup(inq_result, |
773 | max_t(size_t, sdev->inquiry_len, 36), |
774 | GFP_ATOMIC); |
775 | if (sdev->inquiry == NULL) |
776 | return SCSI_SCAN_NO_RESPONSE; |
777 | |
778 | sdev->vendor = (char *) (sdev->inquiry + 8); |
779 | sdev->model = (char *) (sdev->inquiry + 16); |
780 | sdev->rev = (char *) (sdev->inquiry + 32); |
781 | |
782 | if (*bflags & BLIST_ISROM) { |
783 | sdev->type = TYPE_ROM; |
784 | sdev->removable = 1; |
785 | } else { |
786 | sdev->type = (inq_result[0] & 0x1f); |
787 | sdev->removable = (inq_result[1] & 0x80) >> 7; |
788 | } |
789 | |
790 | switch (sdev->type) { |
791 | case TYPE_RBC: |
792 | case TYPE_TAPE: |
793 | case TYPE_DISK: |
794 | case TYPE_PRINTER: |
795 | case TYPE_MOD: |
796 | case TYPE_PROCESSOR: |
797 | case TYPE_SCANNER: |
798 | case TYPE_MEDIUM_CHANGER: |
799 | case TYPE_ENCLOSURE: |
800 | case TYPE_COMM: |
801 | case TYPE_RAID: |
802 | case TYPE_OSD: |
803 | sdev->writeable = 1; |
804 | break; |
805 | case TYPE_ROM: |
806 | case TYPE_WORM: |
807 | sdev->writeable = 0; |
808 | break; |
809 | default: |
810 | printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type); |
811 | } |
812 | |
813 | if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) { |
814 | /* RBC and MMC devices can return SCSI-3 compliance and yet |
815 | * still not support REPORT LUNS, so make them act as |
816 | * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is |
817 | * specifically set */ |
818 | if ((*bflags & BLIST_REPORTLUN2) == 0) |
819 | *bflags |= BLIST_NOREPORTLUN; |
820 | } |
821 | |
822 | /* |
823 | * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI |
824 | * spec says: The device server is capable of supporting the |
825 | * specified peripheral device type on this logical unit. However, |
826 | * the physical device is not currently connected to this logical |
827 | * unit. |
828 | * |
829 | * The above is vague, as it implies that we could treat 001 and |
830 | * 011 the same. Stay compatible with previous code, and create a |
831 | * scsi_device for a PQ of 1 |
832 | * |
833 | * Don't set the device offline here; rather let the upper |
834 | * level drivers eval the PQ to decide whether they should |
835 | * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check. |
836 | */ |
837 | |
838 | sdev->inq_periph_qual = (inq_result[0] >> 5) & 7; |
839 | sdev->lockable = sdev->removable; |
840 | sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2); |
841 | |
842 | if (sdev->scsi_level >= SCSI_3 || |
843 | (sdev->inquiry_len > 56 && inq_result[56] & 0x04)) |
844 | sdev->ppr = 1; |
845 | if (inq_result[7] & 0x60) |
846 | sdev->wdtr = 1; |
847 | if (inq_result[7] & 0x10) |
848 | sdev->sdtr = 1; |
849 | |
850 | sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d " |
851 | "ANSI: %d%s\n", scsi_device_type(sdev->type), |
852 | sdev->vendor, sdev->model, sdev->rev, |
853 | sdev->inq_periph_qual, inq_result[2] & 0x07, |
854 | (inq_result[3] & 0x0f) == 1 ? " CCS" : ""); |
855 | |
856 | if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) && |
857 | !(*bflags & BLIST_NOTQ)) |
858 | sdev->tagged_supported = 1; |
859 | |
860 | /* |
861 | * Some devices (Texel CD ROM drives) have handshaking problems |
862 | * when used with the Seagate controllers. borken is initialized |
863 | * to 1, and then set it to 0 here. |
864 | */ |
865 | if ((*bflags & BLIST_BORKEN) == 0) |
866 | sdev->borken = 0; |
867 | |
868 | if (*bflags & BLIST_NO_ULD_ATTACH) |
869 | sdev->no_uld_attach = 1; |
870 | |
871 | /* |
872 | * Apparently some really broken devices (contrary to the SCSI |
873 | * standards) need to be selected without asserting ATN |
874 | */ |
875 | if (*bflags & BLIST_SELECT_NO_ATN) |
876 | sdev->select_no_atn = 1; |
877 | |
878 | /* |
879 | * Maximum 512 sector transfer length |
880 | * broken RA4x00 Compaq Disk Array |
881 | */ |
882 | if (*bflags & BLIST_MAX_512) |
883 | blk_queue_max_hw_sectors(sdev->request_queue, 512); |
884 | |
885 | /* |
886 | * Some devices may not want to have a start command automatically |
887 | * issued when a device is added. |
888 | */ |
889 | if (*bflags & BLIST_NOSTARTONADD) |
890 | sdev->no_start_on_add = 1; |
891 | |
892 | if (*bflags & BLIST_SINGLELUN) |
893 | scsi_target(sdev)->single_lun = 1; |
894 | |
895 | sdev->use_10_for_rw = 1; |
896 | |
897 | if (*bflags & BLIST_MS_SKIP_PAGE_08) |
898 | sdev->skip_ms_page_8 = 1; |
899 | |
900 | if (*bflags & BLIST_MS_SKIP_PAGE_3F) |
901 | sdev->skip_ms_page_3f = 1; |
902 | |
903 | if (*bflags & BLIST_USE_10_BYTE_MS) |
904 | sdev->use_10_for_ms = 1; |
905 | |
906 | /* set the device running here so that slave configure |
907 | * may do I/O */ |
908 | ret = scsi_device_set_state(sdev, SDEV_RUNNING); |
909 | if (ret) { |
910 | ret = scsi_device_set_state(sdev, SDEV_BLOCK); |
911 | |
912 | if (ret) { |
913 | sdev_printk(KERN_ERR, sdev, |
914 | "in wrong state %s to complete scan\n", |
915 | scsi_device_state_name(sdev->sdev_state)); |
916 | return SCSI_SCAN_NO_RESPONSE; |
917 | } |
918 | } |
919 | |
920 | if (*bflags & BLIST_MS_192_BYTES_FOR_3F) |
921 | sdev->use_192_bytes_for_3f = 1; |
922 | |
923 | if (*bflags & BLIST_NOT_LOCKABLE) |
924 | sdev->lockable = 0; |
925 | |
926 | if (*bflags & BLIST_RETRY_HWERROR) |
927 | sdev->retry_hwerror = 1; |
928 | |
929 | transport_configure_device(&sdev->sdev_gendev); |
930 | |
931 | if (sdev->host->hostt->slave_configure) { |
932 | ret = sdev->host->hostt->slave_configure(sdev); |
933 | if (ret) { |
934 | /* |
935 | * if LLDD reports slave not present, don't clutter |
936 | * console with alloc failure messages |
937 | */ |
938 | if (ret != -ENXIO) { |
939 | sdev_printk(KERN_ERR, sdev, |
940 | "failed to configure device\n"); |
941 | } |
942 | return SCSI_SCAN_NO_RESPONSE; |
943 | } |
944 | } |
945 | |
946 | sdev->max_queue_depth = sdev->queue_depth; |
947 | |
948 | /* |
949 | * Ok, the device is now all set up, we can |
950 | * register it and tell the rest of the kernel |
951 | * about it. |
952 | */ |
953 | if (!async && scsi_sysfs_add_sdev(sdev) != 0) |
954 | return SCSI_SCAN_NO_RESPONSE; |
955 | |
956 | return SCSI_SCAN_LUN_PRESENT; |
957 | } |
958 | |
959 | #ifdef CONFIG_SCSI_LOGGING |
960 | /** |
961 | * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace |
962 | * @buf: Output buffer with at least end-first+1 bytes of space |
963 | * @inq: Inquiry buffer (input) |
964 | * @first: Offset of string into inq |
965 | * @end: Index after last character in inq |
966 | */ |
967 | static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq, |
968 | unsigned first, unsigned end) |
969 | { |
970 | unsigned term = 0, idx; |
971 | |
972 | for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) { |
973 | if (inq[idx+first] > ' ') { |
974 | buf[idx] = inq[idx+first]; |
975 | term = idx+1; |
976 | } else { |
977 | buf[idx] = ' '; |
978 | } |
979 | } |
980 | buf[term] = 0; |
981 | return buf; |
982 | } |
983 | #endif |
984 | |
985 | /** |
986 | * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it |
987 | * @starget: pointer to target device structure |
988 | * @lun: LUN of target device |
989 | * @bflagsp: store bflags here if not NULL |
990 | * @sdevp: probe the LUN corresponding to this scsi_device |
991 | * @rescan: if nonzero skip some code only needed on first scan |
992 | * @hostdata: passed to scsi_alloc_sdev() |
993 | * |
994 | * Description: |
995 | * Call scsi_probe_lun, if a LUN with an attached device is found, |
996 | * allocate and set it up by calling scsi_add_lun. |
997 | * |
998 | * Return: |
999 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device |
1000 | * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is |
1001 | * attached at the LUN |
1002 | * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized |
1003 | **/ |
1004 | static int scsi_probe_and_add_lun(struct scsi_target *starget, |
1005 | uint lun, int *bflagsp, |
1006 | struct scsi_device **sdevp, int rescan, |
1007 | void *hostdata) |
1008 | { |
1009 | struct scsi_device *sdev; |
1010 | unsigned char *result; |
1011 | int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256; |
1012 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
1013 | |
1014 | /* |
1015 | * The rescan flag is used as an optimization, the first scan of a |
1016 | * host adapter calls into here with rescan == 0. |
1017 | */ |
1018 | sdev = scsi_device_lookup_by_target(starget, lun); |
1019 | if (sdev) { |
1020 | if (rescan || !scsi_device_created(sdev)) { |
1021 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO |
1022 | "scsi scan: device exists on %s\n", |
1023 | dev_name(&sdev->sdev_gendev))); |
1024 | if (sdevp) |
1025 | *sdevp = sdev; |
1026 | else |
1027 | scsi_device_put(sdev); |
1028 | |
1029 | if (bflagsp) |
1030 | *bflagsp = scsi_get_device_flags(sdev, |
1031 | sdev->vendor, |
1032 | sdev->model); |
1033 | return SCSI_SCAN_LUN_PRESENT; |
1034 | } |
1035 | scsi_device_put(sdev); |
1036 | } else |
1037 | sdev = scsi_alloc_sdev(starget, lun, hostdata); |
1038 | if (!sdev) |
1039 | goto out; |
1040 | |
1041 | result = kmalloc(result_len, GFP_ATOMIC | |
1042 | ((shost->unchecked_isa_dma) ? __GFP_DMA : 0)); |
1043 | if (!result) |
1044 | goto out_free_sdev; |
1045 | |
1046 | if (scsi_probe_lun(sdev, result, result_len, &bflags)) |
1047 | goto out_free_result; |
1048 | |
1049 | if (bflagsp) |
1050 | *bflagsp = bflags; |
1051 | /* |
1052 | * result contains valid SCSI INQUIRY data. |
1053 | */ |
1054 | if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) { |
1055 | /* |
1056 | * For a Peripheral qualifier 3 (011b), the SCSI |
1057 | * spec says: The device server is not capable of |
1058 | * supporting a physical device on this logical |
1059 | * unit. |
1060 | * |
1061 | * For disks, this implies that there is no |
1062 | * logical disk configured at sdev->lun, but there |
1063 | * is a target id responding. |
1064 | */ |
1065 | SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:" |
1066 | " peripheral qualifier of 3, device not" |
1067 | " added\n")) |
1068 | if (lun == 0) { |
1069 | SCSI_LOG_SCAN_BUS(1, { |
1070 | unsigned char vend[9]; |
1071 | unsigned char mod[17]; |
1072 | |
1073 | sdev_printk(KERN_INFO, sdev, |
1074 | "scsi scan: consider passing scsi_mod." |
1075 | "dev_flags=%s:%s:0x240 or 0x1000240\n", |
1076 | scsi_inq_str(vend, result, 8, 16), |
1077 | scsi_inq_str(mod, result, 16, 32)); |
1078 | }); |
1079 | |
1080 | } |
1081 | |
1082 | res = SCSI_SCAN_TARGET_PRESENT; |
1083 | goto out_free_result; |
1084 | } |
1085 | |
1086 | /* |
1087 | * Some targets may set slight variations of PQ and PDT to signal |
1088 | * that no LUN is present, so don't add sdev in these cases. |
1089 | * Two specific examples are: |
1090 | * 1) NetApp targets: return PQ=1, PDT=0x1f |
1091 | * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved" |
1092 | * in the UFI 1.0 spec (we cannot rely on reserved bits). |
1093 | * |
1094 | * References: |
1095 | * 1) SCSI SPC-3, pp. 145-146 |
1096 | * PQ=1: "A peripheral device having the specified peripheral |
1097 | * device type is not connected to this logical unit. However, the |
1098 | * device server is capable of supporting the specified peripheral |
1099 | * device type on this logical unit." |
1100 | * PDT=0x1f: "Unknown or no device type" |
1101 | * 2) USB UFI 1.0, p. 20 |
1102 | * PDT=00h Direct-access device (floppy) |
1103 | * PDT=1Fh none (no FDD connected to the requested logical unit) |
1104 | */ |
1105 | if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) && |
1106 | (result[0] & 0x1f) == 0x1f && |
1107 | !scsi_is_wlun(lun)) { |
1108 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO |
1109 | "scsi scan: peripheral device type" |
1110 | " of 31, no device added\n")); |
1111 | res = SCSI_SCAN_TARGET_PRESENT; |
1112 | goto out_free_result; |
1113 | } |
1114 | |
1115 | res = scsi_add_lun(sdev, result, &bflags, shost->async_scan); |
1116 | if (res == SCSI_SCAN_LUN_PRESENT) { |
1117 | if (bflags & BLIST_KEY) { |
1118 | sdev->lockable = 0; |
1119 | scsi_unlock_floptical(sdev, result); |
1120 | } |
1121 | } |
1122 | |
1123 | out_free_result: |
1124 | kfree(result); |
1125 | out_free_sdev: |
1126 | if (res == SCSI_SCAN_LUN_PRESENT) { |
1127 | if (sdevp) { |
1128 | if (scsi_device_get(sdev) == 0) { |
1129 | *sdevp = sdev; |
1130 | } else { |
1131 | __scsi_remove_device(sdev); |
1132 | res = SCSI_SCAN_NO_RESPONSE; |
1133 | } |
1134 | } |
1135 | } else |
1136 | __scsi_remove_device(sdev); |
1137 | out: |
1138 | return res; |
1139 | } |
1140 | |
1141 | /** |
1142 | * scsi_sequential_lun_scan - sequentially scan a SCSI target |
1143 | * @starget: pointer to target structure to scan |
1144 | * @bflags: black/white list flag for LUN 0 |
1145 | * @scsi_level: Which version of the standard does this device adhere to |
1146 | * @rescan: passed to scsi_probe_add_lun() |
1147 | * |
1148 | * Description: |
1149 | * Generally, scan from LUN 1 (LUN 0 is assumed to already have been |
1150 | * scanned) to some maximum lun until a LUN is found with no device |
1151 | * attached. Use the bflags to figure out any oddities. |
1152 | * |
1153 | * Modifies sdevscan->lun. |
1154 | **/ |
1155 | static void scsi_sequential_lun_scan(struct scsi_target *starget, |
1156 | int bflags, int scsi_level, int rescan) |
1157 | { |
1158 | unsigned int sparse_lun, lun, max_dev_lun; |
1159 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
1160 | |
1161 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of" |
1162 | "%s\n", dev_name(&starget->dev))); |
1163 | |
1164 | max_dev_lun = min(max_scsi_luns, shost->max_lun); |
1165 | /* |
1166 | * If this device is known to support sparse multiple units, |
1167 | * override the other settings, and scan all of them. Normally, |
1168 | * SCSI-3 devices should be scanned via the REPORT LUNS. |
1169 | */ |
1170 | if (bflags & BLIST_SPARSELUN) { |
1171 | max_dev_lun = shost->max_lun; |
1172 | sparse_lun = 1; |
1173 | } else |
1174 | sparse_lun = 0; |
1175 | |
1176 | /* |
1177 | * If less than SCSI_1_CSS, and no special lun scaning, stop |
1178 | * scanning; this matches 2.4 behaviour, but could just be a bug |
1179 | * (to continue scanning a SCSI_1_CSS device). |
1180 | * |
1181 | * This test is broken. We might not have any device on lun0 for |
1182 | * a sparselun device, and if that's the case then how would we |
1183 | * know the real scsi_level, eh? It might make sense to just not |
1184 | * scan any SCSI_1 device for non-0 luns, but that check would best |
1185 | * go into scsi_alloc_sdev() and just have it return null when asked |
1186 | * to alloc an sdev for lun > 0 on an already found SCSI_1 device. |
1187 | * |
1188 | if ((sdevscan->scsi_level < SCSI_1_CCS) && |
1189 | ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN)) |
1190 | == 0)) |
1191 | return; |
1192 | */ |
1193 | /* |
1194 | * If this device is known to support multiple units, override |
1195 | * the other settings, and scan all of them. |
1196 | */ |
1197 | if (bflags & BLIST_FORCELUN) |
1198 | max_dev_lun = shost->max_lun; |
1199 | /* |
1200 | * REGAL CDC-4X: avoid hang after LUN 4 |
1201 | */ |
1202 | if (bflags & BLIST_MAX5LUN) |
1203 | max_dev_lun = min(5U, max_dev_lun); |
1204 | /* |
1205 | * Do not scan SCSI-2 or lower device past LUN 7, unless |
1206 | * BLIST_LARGELUN. |
1207 | */ |
1208 | if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN)) |
1209 | max_dev_lun = min(8U, max_dev_lun); |
1210 | |
1211 | /* |
1212 | * We have already scanned LUN 0, so start at LUN 1. Keep scanning |
1213 | * until we reach the max, or no LUN is found and we are not |
1214 | * sparse_lun. |
1215 | */ |
1216 | for (lun = 1; lun < max_dev_lun; ++lun) |
1217 | if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, |
1218 | NULL) != SCSI_SCAN_LUN_PRESENT) && |
1219 | !sparse_lun) |
1220 | return; |
1221 | } |
1222 | |
1223 | /** |
1224 | * scsilun_to_int: convert a scsi_lun to an int |
1225 | * @scsilun: struct scsi_lun to be converted. |
1226 | * |
1227 | * Description: |
1228 | * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered |
1229 | * integer, and return the result. The caller must check for |
1230 | * truncation before using this function. |
1231 | * |
1232 | * Notes: |
1233 | * The struct scsi_lun is assumed to be four levels, with each level |
1234 | * effectively containing a SCSI byte-ordered (big endian) short; the |
1235 | * addressing bits of each level are ignored (the highest two bits). |
1236 | * For a description of the LUN format, post SCSI-3 see the SCSI |
1237 | * Architecture Model, for SCSI-3 see the SCSI Controller Commands. |
1238 | * |
1239 | * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns |
1240 | * the integer: 0x0b030a04 |
1241 | **/ |
1242 | int scsilun_to_int(struct scsi_lun *scsilun) |
1243 | { |
1244 | int i; |
1245 | unsigned int lun; |
1246 | |
1247 | lun = 0; |
1248 | for (i = 0; i < sizeof(lun); i += 2) |
1249 | lun = lun | (((scsilun->scsi_lun[i] << 8) | |
1250 | scsilun->scsi_lun[i + 1]) << (i * 8)); |
1251 | return lun; |
1252 | } |
1253 | EXPORT_SYMBOL(scsilun_to_int); |
1254 | |
1255 | /** |
1256 | * int_to_scsilun: reverts an int into a scsi_lun |
1257 | * @lun: integer to be reverted |
1258 | * @scsilun: struct scsi_lun to be set. |
1259 | * |
1260 | * Description: |
1261 | * Reverts the functionality of the scsilun_to_int, which packed |
1262 | * an 8-byte lun value into an int. This routine unpacks the int |
1263 | * back into the lun value. |
1264 | * Note: the scsilun_to_int() routine does not truly handle all |
1265 | * 8bytes of the lun value. This functions restores only as much |
1266 | * as was set by the routine. |
1267 | * |
1268 | * Notes: |
1269 | * Given an integer : 0x0b030a04, this function returns a |
1270 | * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00 |
1271 | * |
1272 | **/ |
1273 | void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun) |
1274 | { |
1275 | int i; |
1276 | |
1277 | memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun)); |
1278 | |
1279 | for (i = 0; i < sizeof(lun); i += 2) { |
1280 | scsilun->scsi_lun[i] = (lun >> 8) & 0xFF; |
1281 | scsilun->scsi_lun[i+1] = lun & 0xFF; |
1282 | lun = lun >> 16; |
1283 | } |
1284 | } |
1285 | EXPORT_SYMBOL(int_to_scsilun); |
1286 | |
1287 | /** |
1288 | * scsi_report_lun_scan - Scan using SCSI REPORT LUN results |
1289 | * @starget: which target |
1290 | * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN |
1291 | * @rescan: nonzero if we can skip code only needed on first scan |
1292 | * |
1293 | * Description: |
1294 | * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command. |
1295 | * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun. |
1296 | * |
1297 | * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8 |
1298 | * LUNs even if it's older than SCSI-3. |
1299 | * If BLIST_NOREPORTLUN is set, return 1 always. |
1300 | * If BLIST_NOLUN is set, return 0 always. |
1301 | * |
1302 | * Return: |
1303 | * 0: scan completed (or no memory, so further scanning is futile) |
1304 | * 1: could not scan with REPORT LUN |
1305 | **/ |
1306 | static int scsi_report_lun_scan(struct scsi_target *starget, int bflags, |
1307 | int rescan) |
1308 | { |
1309 | char devname[64]; |
1310 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
1311 | unsigned int length; |
1312 | unsigned int lun; |
1313 | unsigned int num_luns; |
1314 | unsigned int retries; |
1315 | int result; |
1316 | struct scsi_lun *lunp, *lun_data; |
1317 | u8 *data; |
1318 | struct scsi_sense_hdr sshdr; |
1319 | struct scsi_device *sdev; |
1320 | struct Scsi_Host *shost = dev_to_shost(&starget->dev); |
1321 | int ret = 0; |
1322 | |
1323 | /* |
1324 | * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set. |
1325 | * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does |
1326 | * support more than 8 LUNs. |
1327 | */ |
1328 | if (bflags & BLIST_NOREPORTLUN) |
1329 | return 1; |
1330 | if (starget->scsi_level < SCSI_2 && |
1331 | starget->scsi_level != SCSI_UNKNOWN) |
1332 | return 1; |
1333 | if (starget->scsi_level < SCSI_3 && |
1334 | (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) |
1335 | return 1; |
1336 | if (bflags & BLIST_NOLUN) |
1337 | return 0; |
1338 | |
1339 | if (!(sdev = scsi_device_lookup_by_target(starget, 0))) { |
1340 | sdev = scsi_alloc_sdev(starget, 0, NULL); |
1341 | if (!sdev) |
1342 | return 0; |
1343 | if (scsi_device_get(sdev)) { |
1344 | __scsi_remove_device(sdev); |
1345 | return 0; |
1346 | } |
1347 | } |
1348 | |
1349 | sprintf(devname, "host %d channel %d id %d", |
1350 | shost->host_no, sdev->channel, sdev->id); |
1351 | |
1352 | /* |
1353 | * Allocate enough to hold the header (the same size as one scsi_lun) |
1354 | * plus the max number of luns we are requesting. |
1355 | * |
1356 | * Reallocating and trying again (with the exact amount we need) |
1357 | * would be nice, but then we need to somehow limit the size |
1358 | * allocated based on the available memory and the limits of |
1359 | * kmalloc - we don't want a kmalloc() failure of a huge value to |
1360 | * prevent us from finding any LUNs on this target. |
1361 | */ |
1362 | length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun); |
1363 | lun_data = kmalloc(length, GFP_ATOMIC | |
1364 | (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0)); |
1365 | if (!lun_data) { |
1366 | printk(ALLOC_FAILURE_MSG, __func__); |
1367 | goto out; |
1368 | } |
1369 | |
1370 | scsi_cmd[0] = REPORT_LUNS; |
1371 | |
1372 | /* |
1373 | * bytes 1 - 5: reserved, set to zero. |
1374 | */ |
1375 | memset(&scsi_cmd[1], 0, 5); |
1376 | |
1377 | /* |
1378 | * bytes 6 - 9: length of the command. |
1379 | */ |
1380 | scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff; |
1381 | scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff; |
1382 | scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff; |
1383 | scsi_cmd[9] = (unsigned char) length & 0xff; |
1384 | |
1385 | scsi_cmd[10] = 0; /* reserved */ |
1386 | scsi_cmd[11] = 0; /* control */ |
1387 | |
1388 | /* |
1389 | * We can get a UNIT ATTENTION, for example a power on/reset, so |
1390 | * retry a few times (like sd.c does for TEST UNIT READY). |
1391 | * Experience shows some combinations of adapter/devices get at |
1392 | * least two power on/resets. |
1393 | * |
1394 | * Illegal requests (for devices that do not support REPORT LUNS) |
1395 | * should come through as a check condition, and will not generate |
1396 | * a retry. |
1397 | */ |
1398 | for (retries = 0; retries < 3; retries++) { |
1399 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending" |
1400 | " REPORT LUNS to %s (try %d)\n", devname, |
1401 | retries)); |
1402 | |
1403 | result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, |
1404 | lun_data, length, &sshdr, |
1405 | SCSI_TIMEOUT + 4 * HZ, 3, NULL); |
1406 | |
1407 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS" |
1408 | " %s (try %d) result 0x%x\n", result |
1409 | ? "failed" : "successful", retries, result)); |
1410 | if (result == 0) |
1411 | break; |
1412 | else if (scsi_sense_valid(&sshdr)) { |
1413 | if (sshdr.sense_key != UNIT_ATTENTION) |
1414 | break; |
1415 | } |
1416 | } |
1417 | |
1418 | if (result) { |
1419 | /* |
1420 | * The device probably does not support a REPORT LUN command |
1421 | */ |
1422 | ret = 1; |
1423 | goto out_err; |
1424 | } |
1425 | |
1426 | /* |
1427 | * Get the length from the first four bytes of lun_data. |
1428 | */ |
1429 | data = (u8 *) lun_data->scsi_lun; |
1430 | length = ((data[0] << 24) | (data[1] << 16) | |
1431 | (data[2] << 8) | (data[3] << 0)); |
1432 | |
1433 | num_luns = (length / sizeof(struct scsi_lun)); |
1434 | if (num_luns > max_scsi_report_luns) { |
1435 | printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)" |
1436 | " of %d luns reported, try increasing" |
1437 | " max_scsi_report_luns.\n", devname, |
1438 | max_scsi_report_luns, num_luns); |
1439 | num_luns = max_scsi_report_luns; |
1440 | } |
1441 | |
1442 | SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, |
1443 | "scsi scan: REPORT LUN scan\n")); |
1444 | |
1445 | /* |
1446 | * Scan the luns in lun_data. The entry at offset 0 is really |
1447 | * the header, so start at 1 and go up to and including num_luns. |
1448 | */ |
1449 | for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) { |
1450 | lun = scsilun_to_int(lunp); |
1451 | |
1452 | /* |
1453 | * Check if the unused part of lunp is non-zero, and so |
1454 | * does not fit in lun. |
1455 | */ |
1456 | if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) { |
1457 | int i; |
1458 | |
1459 | /* |
1460 | * Output an error displaying the LUN in byte order, |
1461 | * this differs from what linux would print for the |
1462 | * integer LUN value. |
1463 | */ |
1464 | printk(KERN_WARNING "scsi: %s lun 0x", devname); |
1465 | data = (char *)lunp->scsi_lun; |
1466 | for (i = 0; i < sizeof(struct scsi_lun); i++) |
1467 | printk("%02x", data[i]); |
1468 | printk(" has a LUN larger than currently supported.\n"); |
1469 | } else if (lun > sdev->host->max_lun) { |
1470 | printk(KERN_WARNING "scsi: %s lun%d has a LUN larger" |
1471 | " than allowed by the host adapter\n", |
1472 | devname, lun); |
1473 | } else { |
1474 | int res; |
1475 | |
1476 | res = scsi_probe_and_add_lun(starget, |
1477 | lun, NULL, NULL, rescan, NULL); |
1478 | if (res == SCSI_SCAN_NO_RESPONSE) { |
1479 | /* |
1480 | * Got some results, but now none, abort. |
1481 | */ |
1482 | sdev_printk(KERN_ERR, sdev, |
1483 | "Unexpected response" |
1484 | " from lun %d while scanning, scan" |
1485 | " aborted\n", lun); |
1486 | break; |
1487 | } |
1488 | } |
1489 | } |
1490 | |
1491 | out_err: |
1492 | kfree(lun_data); |
1493 | out: |
1494 | scsi_device_put(sdev); |
1495 | if (scsi_device_created(sdev)) |
1496 | /* |
1497 | * the sdev we used didn't appear in the report luns scan |
1498 | */ |
1499 | __scsi_remove_device(sdev); |
1500 | return ret; |
1501 | } |
1502 | |
1503 | struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel, |
1504 | uint id, uint lun, void *hostdata) |
1505 | { |
1506 | struct scsi_device *sdev = ERR_PTR(-ENODEV); |
1507 | struct device *parent = &shost->shost_gendev; |
1508 | struct scsi_target *starget; |
1509 | |
1510 | if (strncmp(scsi_scan_type, "none", 4) == 0) |
1511 | return ERR_PTR(-ENODEV); |
1512 | |
1513 | starget = scsi_alloc_target(parent, channel, id); |
1514 | if (!starget) |
1515 | return ERR_PTR(-ENOMEM); |
1516 | |
1517 | mutex_lock(&shost->scan_mutex); |
1518 | if (!shost->async_scan) |
1519 | scsi_complete_async_scans(); |
1520 | |
1521 | if (scsi_host_scan_allowed(shost)) |
1522 | scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata); |
1523 | mutex_unlock(&shost->scan_mutex); |
1524 | scsi_target_reap(starget); |
1525 | put_device(&starget->dev); |
1526 | |
1527 | return sdev; |
1528 | } |
1529 | EXPORT_SYMBOL(__scsi_add_device); |
1530 | |
1531 | int scsi_add_device(struct Scsi_Host *host, uint channel, |
1532 | uint target, uint lun) |
1533 | { |
1534 | struct scsi_device *sdev = |
1535 | __scsi_add_device(host, channel, target, lun, NULL); |
1536 | if (IS_ERR(sdev)) |
1537 | return PTR_ERR(sdev); |
1538 | |
1539 | scsi_device_put(sdev); |
1540 | return 0; |
1541 | } |
1542 | EXPORT_SYMBOL(scsi_add_device); |
1543 | |
1544 | void scsi_rescan_device(struct device *dev) |
1545 | { |
1546 | struct scsi_driver *drv; |
1547 | |
1548 | if (!dev->driver) |
1549 | return; |
1550 | |
1551 | drv = to_scsi_driver(dev->driver); |
1552 | if (try_module_get(drv->owner)) { |
1553 | if (drv->rescan) |
1554 | drv->rescan(dev); |
1555 | module_put(drv->owner); |
1556 | } |
1557 | } |
1558 | EXPORT_SYMBOL(scsi_rescan_device); |
1559 | |
1560 | static void __scsi_scan_target(struct device *parent, unsigned int channel, |
1561 | unsigned int id, unsigned int lun, int rescan) |
1562 | { |
1563 | struct Scsi_Host *shost = dev_to_shost(parent); |
1564 | int bflags = 0; |
1565 | int res; |
1566 | struct scsi_target *starget; |
1567 | |
1568 | if (shost->this_id == id) |
1569 | /* |
1570 | * Don't scan the host adapter |
1571 | */ |
1572 | return; |
1573 | |
1574 | starget = scsi_alloc_target(parent, channel, id); |
1575 | if (!starget) |
1576 | return; |
1577 | |
1578 | if (lun != SCAN_WILD_CARD) { |
1579 | /* |
1580 | * Scan for a specific host/chan/id/lun. |
1581 | */ |
1582 | scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL); |
1583 | goto out_reap; |
1584 | } |
1585 | |
1586 | /* |
1587 | * Scan LUN 0, if there is some response, scan further. Ideally, we |
1588 | * would not configure LUN 0 until all LUNs are scanned. |
1589 | */ |
1590 | res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL); |
1591 | if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) { |
1592 | if (scsi_report_lun_scan(starget, bflags, rescan) != 0) |
1593 | /* |
1594 | * The REPORT LUN did not scan the target, |
1595 | * do a sequential scan. |
1596 | */ |
1597 | scsi_sequential_lun_scan(starget, bflags, |
1598 | starget->scsi_level, rescan); |
1599 | } |
1600 | |
1601 | out_reap: |
1602 | /* now determine if the target has any children at all |
1603 | * and if not, nuke it */ |
1604 | scsi_target_reap(starget); |
1605 | |
1606 | put_device(&starget->dev); |
1607 | } |
1608 | |
1609 | /** |
1610 | * scsi_scan_target - scan a target id, possibly including all LUNs on the target. |
1611 | * @parent: host to scan |
1612 | * @channel: channel to scan |
1613 | * @id: target id to scan |
1614 | * @lun: Specific LUN to scan or SCAN_WILD_CARD |
1615 | * @rescan: passed to LUN scanning routines |
1616 | * |
1617 | * Description: |
1618 | * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0, |
1619 | * and possibly all LUNs on the target id. |
1620 | * |
1621 | * First try a REPORT LUN scan, if that does not scan the target, do a |
1622 | * sequential scan of LUNs on the target id. |
1623 | **/ |
1624 | void scsi_scan_target(struct device *parent, unsigned int channel, |
1625 | unsigned int id, unsigned int lun, int rescan) |
1626 | { |
1627 | struct Scsi_Host *shost = dev_to_shost(parent); |
1628 | |
1629 | if (strncmp(scsi_scan_type, "none", 4) == 0) |
1630 | return; |
1631 | |
1632 | mutex_lock(&shost->scan_mutex); |
1633 | if (!shost->async_scan) |
1634 | scsi_complete_async_scans(); |
1635 | |
1636 | if (scsi_host_scan_allowed(shost)) |
1637 | __scsi_scan_target(parent, channel, id, lun, rescan); |
1638 | mutex_unlock(&shost->scan_mutex); |
1639 | } |
1640 | EXPORT_SYMBOL(scsi_scan_target); |
1641 | |
1642 | static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel, |
1643 | unsigned int id, unsigned int lun, int rescan) |
1644 | { |
1645 | uint order_id; |
1646 | |
1647 | if (id == SCAN_WILD_CARD) |
1648 | for (id = 0; id < shost->max_id; ++id) { |
1649 | /* |
1650 | * XXX adapter drivers when possible (FCP, iSCSI) |
1651 | * could modify max_id to match the current max, |
1652 | * not the absolute max. |
1653 | * |
1654 | * XXX add a shost id iterator, so for example, |
1655 | * the FC ID can be the same as a target id |
1656 | * without a huge overhead of sparse id's. |
1657 | */ |
1658 | if (shost->reverse_ordering) |
1659 | /* |
1660 | * Scan from high to low id. |
1661 | */ |
1662 | order_id = shost->max_id - id - 1; |
1663 | else |
1664 | order_id = id; |
1665 | __scsi_scan_target(&shost->shost_gendev, channel, |
1666 | order_id, lun, rescan); |
1667 | } |
1668 | else |
1669 | __scsi_scan_target(&shost->shost_gendev, channel, |
1670 | id, lun, rescan); |
1671 | } |
1672 | |
1673 | int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel, |
1674 | unsigned int id, unsigned int lun, int rescan) |
1675 | { |
1676 | SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost, |
1677 | "%s: <%u:%u:%u>\n", |
1678 | __func__, channel, id, lun)); |
1679 | |
1680 | if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) || |
1681 | ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) || |
1682 | ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun))) |
1683 | return -EINVAL; |
1684 | |
1685 | mutex_lock(&shost->scan_mutex); |
1686 | if (!shost->async_scan) |
1687 | scsi_complete_async_scans(); |
1688 | |
1689 | if (scsi_host_scan_allowed(shost)) { |
1690 | if (channel == SCAN_WILD_CARD) |
1691 | for (channel = 0; channel <= shost->max_channel; |
1692 | channel++) |
1693 | scsi_scan_channel(shost, channel, id, lun, |
1694 | rescan); |
1695 | else |
1696 | scsi_scan_channel(shost, channel, id, lun, rescan); |
1697 | } |
1698 | mutex_unlock(&shost->scan_mutex); |
1699 | |
1700 | return 0; |
1701 | } |
1702 | |
1703 | static void scsi_sysfs_add_devices(struct Scsi_Host *shost) |
1704 | { |
1705 | struct scsi_device *sdev; |
1706 | shost_for_each_device(sdev, shost) { |
1707 | if (!scsi_host_scan_allowed(shost) || |
1708 | scsi_sysfs_add_sdev(sdev) != 0) |
1709 | __scsi_remove_device(sdev); |
1710 | } |
1711 | } |
1712 | |
1713 | /** |
1714 | * scsi_prep_async_scan - prepare for an async scan |
1715 | * @shost: the host which will be scanned |
1716 | * Returns: a cookie to be passed to scsi_finish_async_scan() |
1717 | * |
1718 | * Tells the midlayer this host is going to do an asynchronous scan. |
1719 | * It reserves the host's position in the scanning list and ensures |
1720 | * that other asynchronous scans started after this one won't affect the |
1721 | * ordering of the discovered devices. |
1722 | */ |
1723 | static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost) |
1724 | { |
1725 | struct async_scan_data *data; |
1726 | unsigned long flags; |
1727 | |
1728 | if (strncmp(scsi_scan_type, "sync", 4) == 0) |
1729 | return NULL; |
1730 | |
1731 | if (shost->async_scan) { |
1732 | printk("%s called twice for host %d", __func__, |
1733 | shost->host_no); |
1734 | dump_stack(); |
1735 | return NULL; |
1736 | } |
1737 | |
1738 | data = kmalloc(sizeof(*data), GFP_KERNEL); |
1739 | if (!data) |
1740 | goto err; |
1741 | data->shost = scsi_host_get(shost); |
1742 | if (!data->shost) |
1743 | goto err; |
1744 | init_completion(&data->prev_finished); |
1745 | |
1746 | mutex_lock(&shost->scan_mutex); |
1747 | spin_lock_irqsave(shost->host_lock, flags); |
1748 | shost->async_scan = 1; |
1749 | spin_unlock_irqrestore(shost->host_lock, flags); |
1750 | mutex_unlock(&shost->scan_mutex); |
1751 | |
1752 | spin_lock(&async_scan_lock); |
1753 | if (list_empty(&scanning_hosts)) |
1754 | complete(&data->prev_finished); |
1755 | list_add_tail(&data->list, &scanning_hosts); |
1756 | spin_unlock(&async_scan_lock); |
1757 | |
1758 | return data; |
1759 | |
1760 | err: |
1761 | kfree(data); |
1762 | return NULL; |
1763 | } |
1764 | |
1765 | /** |
1766 | * scsi_finish_async_scan - asynchronous scan has finished |
1767 | * @data: cookie returned from earlier call to scsi_prep_async_scan() |
1768 | * |
1769 | * All the devices currently attached to this host have been found. |
1770 | * This function announces all the devices it has found to the rest |
1771 | * of the system. |
1772 | */ |
1773 | static void scsi_finish_async_scan(struct async_scan_data *data) |
1774 | { |
1775 | struct Scsi_Host *shost; |
1776 | unsigned long flags; |
1777 | |
1778 | if (!data) |
1779 | return; |
1780 | |
1781 | shost = data->shost; |
1782 | |
1783 | mutex_lock(&shost->scan_mutex); |
1784 | |
1785 | if (!shost->async_scan) { |
1786 | printk("%s called twice for host %d", __func__, |
1787 | shost->host_no); |
1788 | dump_stack(); |
1789 | mutex_unlock(&shost->scan_mutex); |
1790 | return; |
1791 | } |
1792 | |
1793 | wait_for_completion(&data->prev_finished); |
1794 | |
1795 | scsi_sysfs_add_devices(shost); |
1796 | |
1797 | spin_lock_irqsave(shost->host_lock, flags); |
1798 | shost->async_scan = 0; |
1799 | spin_unlock_irqrestore(shost->host_lock, flags); |
1800 | |
1801 | mutex_unlock(&shost->scan_mutex); |
1802 | |
1803 | spin_lock(&async_scan_lock); |
1804 | list_del(&data->list); |
1805 | if (!list_empty(&scanning_hosts)) { |
1806 | struct async_scan_data *next = list_entry(scanning_hosts.next, |
1807 | struct async_scan_data, list); |
1808 | complete(&next->prev_finished); |
1809 | } |
1810 | spin_unlock(&async_scan_lock); |
1811 | |
1812 | scsi_host_put(shost); |
1813 | kfree(data); |
1814 | } |
1815 | |
1816 | static void do_scsi_scan_host(struct Scsi_Host *shost) |
1817 | { |
1818 | if (shost->hostt->scan_finished) { |
1819 | unsigned long start = jiffies; |
1820 | if (shost->hostt->scan_start) |
1821 | shost->hostt->scan_start(shost); |
1822 | |
1823 | while (!shost->hostt->scan_finished(shost, jiffies - start)) |
1824 | msleep(10); |
1825 | } else { |
1826 | scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD, |
1827 | SCAN_WILD_CARD, 0); |
1828 | } |
1829 | } |
1830 | |
1831 | static int do_scan_async(void *_data) |
1832 | { |
1833 | struct async_scan_data *data = _data; |
1834 | do_scsi_scan_host(data->shost); |
1835 | scsi_finish_async_scan(data); |
1836 | return 0; |
1837 | } |
1838 | |
1839 | /** |
1840 | * scsi_scan_host - scan the given adapter |
1841 | * @shost: adapter to scan |
1842 | **/ |
1843 | void scsi_scan_host(struct Scsi_Host *shost) |
1844 | { |
1845 | struct task_struct *p; |
1846 | struct async_scan_data *data; |
1847 | |
1848 | if (strncmp(scsi_scan_type, "none", 4) == 0) |
1849 | return; |
1850 | |
1851 | data = scsi_prep_async_scan(shost); |
1852 | if (!data) { |
1853 | do_scsi_scan_host(shost); |
1854 | return; |
1855 | } |
1856 | |
1857 | p = kthread_run(do_scan_async, data, "scsi_scan_%d", shost->host_no); |
1858 | if (IS_ERR(p)) |
1859 | do_scan_async(data); |
1860 | } |
1861 | EXPORT_SYMBOL(scsi_scan_host); |
1862 | |
1863 | void scsi_forget_host(struct Scsi_Host *shost) |
1864 | { |
1865 | struct scsi_device *sdev; |
1866 | unsigned long flags; |
1867 | |
1868 | restart: |
1869 | spin_lock_irqsave(shost->host_lock, flags); |
1870 | list_for_each_entry(sdev, &shost->__devices, siblings) { |
1871 | if (sdev->sdev_state == SDEV_DEL) |
1872 | continue; |
1873 | spin_unlock_irqrestore(shost->host_lock, flags); |
1874 | __scsi_remove_device(sdev); |
1875 | goto restart; |
1876 | } |
1877 | spin_unlock_irqrestore(shost->host_lock, flags); |
1878 | } |
1879 | |
1880 | /* |
1881 | * Function: scsi_get_host_dev() |
1882 | * |
1883 | * Purpose: Create a scsi_device that points to the host adapter itself. |
1884 | * |
1885 | * Arguments: SHpnt - Host that needs a scsi_device |
1886 | * |
1887 | * Lock status: None assumed. |
1888 | * |
1889 | * Returns: The scsi_device or NULL |
1890 | * |
1891 | * Notes: |
1892 | * Attach a single scsi_device to the Scsi_Host - this should |
1893 | * be made to look like a "pseudo-device" that points to the |
1894 | * HA itself. |
1895 | * |
1896 | * Note - this device is not accessible from any high-level |
1897 | * drivers (including generics), which is probably not |
1898 | * optimal. We can add hooks later to attach |
1899 | */ |
1900 | struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost) |
1901 | { |
1902 | struct scsi_device *sdev = NULL; |
1903 | struct scsi_target *starget; |
1904 | |
1905 | mutex_lock(&shost->scan_mutex); |
1906 | if (!scsi_host_scan_allowed(shost)) |
1907 | goto out; |
1908 | starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id); |
1909 | if (!starget) |
1910 | goto out; |
1911 | |
1912 | sdev = scsi_alloc_sdev(starget, 0, NULL); |
1913 | if (sdev) |
1914 | sdev->borken = 0; |
1915 | else |
1916 | scsi_target_reap(starget); |
1917 | put_device(&starget->dev); |
1918 | out: |
1919 | mutex_unlock(&shost->scan_mutex); |
1920 | return sdev; |
1921 | } |
1922 | EXPORT_SYMBOL(scsi_get_host_dev); |
1923 | |
1924 | /* |
1925 | * Function: scsi_free_host_dev() |
1926 | * |
1927 | * Purpose: Free a scsi_device that points to the host adapter itself. |
1928 | * |
1929 | * Arguments: SHpnt - Host that needs a scsi_device |
1930 | * |
1931 | * Lock status: None assumed. |
1932 | * |
1933 | * Returns: Nothing |
1934 | * |
1935 | * Notes: |
1936 | */ |
1937 | void scsi_free_host_dev(struct scsi_device *sdev) |
1938 | { |
1939 | BUG_ON(sdev->id != sdev->host->this_id); |
1940 | |
1941 | __scsi_remove_device(sdev); |
1942 | } |
1943 | EXPORT_SYMBOL(scsi_free_host_dev); |
1944 | |
1945 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9