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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * scsi_scan.c | |
4 | * | |
5 | * Copyright (C) 2000 Eric Youngdale, | |
6 | * Copyright (C) 2002 Patrick Mansfield | |
7 | * | |
8 | * The general scanning/probing algorithm is as follows, exceptions are | |
9 | * made to it depending on device specific flags, compilation options, and | |
10 | * global variable (boot or module load time) settings. | |
11 | * | |
12 | * A specific LUN is scanned via an INQUIRY command; if the LUN has a | |
f64a181d | 13 | * device attached, a scsi_device is allocated and setup for it. |
1da177e4 LT |
14 | * |
15 | * For every id of every channel on the given host: | |
16 | * | |
17 | * Scan LUN 0; if the target responds to LUN 0 (even if there is no | |
18 | * device or storage attached to LUN 0): | |
19 | * | |
20 | * If LUN 0 has a device attached, allocate and setup a | |
f64a181d | 21 | * scsi_device for it. |
1da177e4 LT |
22 | * |
23 | * If target is SCSI-3 or up, issue a REPORT LUN, and scan | |
24 | * all of the LUNs returned by the REPORT LUN; else, | |
25 | * sequentially scan LUNs up until some maximum is reached, | |
26 | * or a LUN is seen that cannot have a device attached to it. | |
27 | */ | |
28 | ||
1da177e4 LT |
29 | #include <linux/module.h> |
30 | #include <linux/moduleparam.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/blkdev.h> | |
3e082a91 MW |
33 | #include <linux/delay.h> |
34 | #include <linux/kthread.h> | |
35 | #include <linux/spinlock.h> | |
4ace92fc | 36 | #include <linux/async.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
2a904e5d | 38 | #include <asm/unaligned.h> |
1da177e4 LT |
39 | |
40 | #include <scsi/scsi.h> | |
beb40487 | 41 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
42 | #include <scsi/scsi_device.h> |
43 | #include <scsi/scsi_driver.h> | |
44 | #include <scsi/scsi_devinfo.h> | |
45 | #include <scsi/scsi_host.h> | |
1da177e4 | 46 | #include <scsi/scsi_transport.h> |
d3d32891 | 47 | #include <scsi/scsi_dh.h> |
1da177e4 LT |
48 | #include <scsi/scsi_eh.h> |
49 | ||
50 | #include "scsi_priv.h" | |
51 | #include "scsi_logging.h" | |
52 | ||
53 | #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \ | |
54 | " SCSI scanning, some SCSI devices might not be configured\n" | |
55 | ||
56 | /* | |
57 | * Default timeout | |
58 | */ | |
59 | #define SCSI_TIMEOUT (2*HZ) | |
b39c9a66 | 60 | #define SCSI_REPORT_LUNS_TIMEOUT (30*HZ) |
1da177e4 LT |
61 | |
62 | /* | |
405ae7d3 | 63 | * Prefix values for the SCSI id's (stored in sysfs name field) |
1da177e4 LT |
64 | */ |
65 | #define SCSI_UID_SER_NUM 'S' | |
66 | #define SCSI_UID_UNKNOWN 'Z' | |
67 | ||
68 | /* | |
69 | * Return values of some of the scanning functions. | |
70 | * | |
71 | * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this | |
72 | * includes allocation or general failures preventing IO from being sent. | |
73 | * | |
74 | * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available | |
75 | * on the given LUN. | |
76 | * | |
77 | * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a | |
78 | * given LUN. | |
79 | */ | |
80 | #define SCSI_SCAN_NO_RESPONSE 0 | |
81 | #define SCSI_SCAN_TARGET_PRESENT 1 | |
82 | #define SCSI_SCAN_LUN_PRESENT 2 | |
83 | ||
0ad78200 | 84 | static const char *scsi_null_device_strs = "nullnullnullnull"; |
1da177e4 LT |
85 | |
86 | #define MAX_SCSI_LUNS 512 | |
87 | ||
1abf635d | 88 | static u64 max_scsi_luns = MAX_SCSI_LUNS; |
1da177e4 | 89 | |
1abf635d | 90 | module_param_named(max_luns, max_scsi_luns, ullong, S_IRUGO|S_IWUSR); |
1da177e4 | 91 | MODULE_PARM_DESC(max_luns, |
1abf635d | 92 | "last scsi LUN (should be between 1 and 2^64-1)"); |
1da177e4 | 93 | |
21db1882 MW |
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 | ||
7cc5aad6 | 100 | static char scsi_scan_type[7] = SCSI_SCAN_TYPE_DEFAULT; |
3e082a91 | 101 | |
1d645088 HR |
102 | module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), |
103 | S_IRUGO|S_IWUSR); | |
104 | MODULE_PARM_DESC(scan, "sync, async, manual, or none. " | |
105 | "Setting to 'manual' disables automatic scanning, but allows " | |
106 | "for manual device scan via the 'scan' sysfs attribute."); | |
3e082a91 | 107 | |
14faf12f | 108 | static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ + 18; |
1da177e4 | 109 | |
10f4b89a | 110 | module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR); |
1da177e4 LT |
111 | MODULE_PARM_DESC(inq_timeout, |
112 | "Timeout (in seconds) waiting for devices to answer INQUIRY." | |
14faf12f | 113 | " Default is 20. Some devices may need more; most need less."); |
1da177e4 | 114 | |
6b7f123f | 115 | /* This lock protects only this list */ |
3e082a91 MW |
116 | static DEFINE_SPINLOCK(async_scan_lock); |
117 | static LIST_HEAD(scanning_hosts); | |
118 | ||
119 | struct async_scan_data { | |
120 | struct list_head list; | |
121 | struct Scsi_Host *shost; | |
122 | struct completion prev_finished; | |
123 | }; | |
124 | ||
776141dd | 125 | /* |
a19a93e4 BVA |
126 | * scsi_enable_async_suspend - Enable async suspend and resume |
127 | */ | |
128 | void scsi_enable_async_suspend(struct device *dev) | |
129 | { | |
130 | /* | |
131 | * If a user has disabled async probing a likely reason is due to a | |
132 | * storage enclosure that does not inject staggered spin-ups. For | |
133 | * safety, make resume synchronous as well in that case. | |
134 | */ | |
135 | if (strncmp(scsi_scan_type, "async", 5) != 0) | |
136 | return; | |
137 | /* Enable asynchronous suspend and resume. */ | |
138 | device_enable_async_suspend(dev); | |
139 | } | |
140 | ||
3e082a91 MW |
141 | /** |
142 | * scsi_complete_async_scans - Wait for asynchronous scans to complete | |
143 | * | |
8bcc2412 MW |
144 | * When this function returns, any host which started scanning before |
145 | * this function was called will have finished its scan. Hosts which | |
146 | * started scanning after this function was called may or may not have | |
147 | * finished. | |
3e082a91 MW |
148 | */ |
149 | int scsi_complete_async_scans(void) | |
150 | { | |
151 | struct async_scan_data *data; | |
152 | ||
153 | do { | |
154 | if (list_empty(&scanning_hosts)) | |
e96eb23d | 155 | return 0; |
3e082a91 MW |
156 | /* If we can't get memory immediately, that's OK. Just |
157 | * sleep a little. Even if we never get memory, the async | |
158 | * scans will finish eventually. | |
159 | */ | |
160 | data = kmalloc(sizeof(*data), GFP_KERNEL); | |
161 | if (!data) | |
162 | msleep(1); | |
163 | } while (!data); | |
164 | ||
165 | data->shost = NULL; | |
166 | init_completion(&data->prev_finished); | |
167 | ||
168 | spin_lock(&async_scan_lock); | |
169 | /* Check that there's still somebody else on the list */ | |
170 | if (list_empty(&scanning_hosts)) | |
171 | goto done; | |
172 | list_add_tail(&data->list, &scanning_hosts); | |
173 | spin_unlock(&async_scan_lock); | |
174 | ||
175 | printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n"); | |
176 | wait_for_completion(&data->prev_finished); | |
177 | ||
178 | spin_lock(&async_scan_lock); | |
179 | list_del(&data->list); | |
8bcc2412 MW |
180 | if (!list_empty(&scanning_hosts)) { |
181 | struct async_scan_data *next = list_entry(scanning_hosts.next, | |
182 | struct async_scan_data, list); | |
183 | complete(&next->prev_finished); | |
184 | } | |
3e082a91 MW |
185 | done: |
186 | spin_unlock(&async_scan_lock); | |
43a8d39d | 187 | |
e96eb23d | 188 | kfree(data); |
3e082a91 MW |
189 | return 0; |
190 | } | |
191 | ||
1da177e4 LT |
192 | /** |
193 | * scsi_unlock_floptical - unlock device via a special MODE SENSE command | |
39216033 | 194 | * @sdev: scsi device to send command to |
1da177e4 LT |
195 | * @result: area to store the result of the MODE SENSE |
196 | * | |
197 | * Description: | |
39216033 | 198 | * Send a vendor specific MODE SENSE (not a MODE SELECT) command. |
1da177e4 LT |
199 | * Called for BLIST_KEY devices. |
200 | **/ | |
39216033 | 201 | static void scsi_unlock_floptical(struct scsi_device *sdev, |
1da177e4 LT |
202 | unsigned char *result) |
203 | { | |
204 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
205 | ||
91921e01 | 206 | sdev_printk(KERN_NOTICE, sdev, "unlocking floptical drive\n"); |
1da177e4 LT |
207 | scsi_cmd[0] = MODE_SENSE; |
208 | scsi_cmd[1] = 0; | |
209 | scsi_cmd[2] = 0x2e; | |
210 | scsi_cmd[3] = 0; | |
39216033 | 211 | scsi_cmd[4] = 0x2a; /* size */ |
1da177e4 | 212 | scsi_cmd[5] = 0; |
7dfe0b5e | 213 | scsi_execute_cmd(sdev, scsi_cmd, REQ_OP_DRV_IN, result, 0x2a, |
f4f4e47e | 214 | SCSI_TIMEOUT, 3, NULL); |
1da177e4 LT |
215 | } |
216 | ||
edb854a3 ML |
217 | static int scsi_realloc_sdev_budget_map(struct scsi_device *sdev, |
218 | unsigned int depth) | |
219 | { | |
220 | int new_shift = sbitmap_calculate_shift(depth); | |
221 | bool need_alloc = !sdev->budget_map.map; | |
222 | bool need_free = false; | |
223 | int ret; | |
224 | struct sbitmap sb_backup; | |
225 | ||
eaba83b5 JG |
226 | depth = min_t(unsigned int, depth, scsi_device_max_queue_depth(sdev)); |
227 | ||
edb854a3 ML |
228 | /* |
229 | * realloc if new shift is calculated, which is caused by setting | |
230 | * up one new default queue depth after calling ->slave_configure | |
231 | */ | |
232 | if (!need_alloc && new_shift != sdev->budget_map.shift) | |
233 | need_alloc = need_free = true; | |
234 | ||
235 | if (!need_alloc) | |
236 | return 0; | |
237 | ||
238 | /* | |
239 | * Request queue has to be frozen for reallocating budget map, | |
240 | * and here disk isn't added yet, so freezing is pretty fast | |
241 | */ | |
242 | if (need_free) { | |
243 | blk_mq_freeze_queue(sdev->request_queue); | |
244 | sb_backup = sdev->budget_map; | |
245 | } | |
246 | ret = sbitmap_init_node(&sdev->budget_map, | |
247 | scsi_device_max_queue_depth(sdev), | |
248 | new_shift, GFP_KERNEL, | |
249 | sdev->request_queue->node, false, true); | |
eaba83b5 JG |
250 | if (!ret) |
251 | sbitmap_resize(&sdev->budget_map, depth); | |
252 | ||
edb854a3 ML |
253 | if (need_free) { |
254 | if (ret) | |
255 | sdev->budget_map = sb_backup; | |
256 | else | |
257 | sbitmap_free(&sb_backup); | |
258 | ret = 0; | |
259 | blk_mq_unfreeze_queue(sdev->request_queue); | |
260 | } | |
261 | return ret; | |
262 | } | |
263 | ||
1da177e4 LT |
264 | /** |
265 | * scsi_alloc_sdev - allocate and setup a scsi_Device | |
eb44820c RL |
266 | * @starget: which target to allocate a &scsi_device for |
267 | * @lun: which lun | |
268 | * @hostdata: usually NULL and set by ->slave_alloc instead | |
1da177e4 LT |
269 | * |
270 | * Description: | |
271 | * Allocate, initialize for io, and return a pointer to a scsi_Device. | |
272 | * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and | |
273 | * adds scsi_Device to the appropriate list. | |
274 | * | |
275 | * Return value: | |
276 | * scsi_Device pointer, or NULL on failure. | |
277 | **/ | |
278 | static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, | |
9cb78c16 | 279 | u64 lun, void *hostdata) |
1da177e4 | 280 | { |
020b0f0a | 281 | unsigned int depth; |
1da177e4 | 282 | struct scsi_device *sdev; |
59506abe | 283 | struct request_queue *q; |
1da177e4 LT |
284 | int display_failure_msg = 1, ret; |
285 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
286 | ||
24669f75 | 287 | sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size, |
1749ef00 | 288 | GFP_KERNEL); |
1da177e4 LT |
289 | if (!sdev) |
290 | goto out; | |
291 | ||
1da177e4 LT |
292 | sdev->vendor = scsi_null_device_strs; |
293 | sdev->model = scsi_null_device_strs; | |
294 | sdev->rev = scsi_null_device_strs; | |
295 | sdev->host = shost; | |
4a84067d | 296 | sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD; |
1da177e4 LT |
297 | sdev->id = starget->id; |
298 | sdev->lun = lun; | |
299 | sdev->channel = starget->channel; | |
0db6ca8a | 300 | mutex_init(&sdev->state_mutex); |
1da177e4 LT |
301 | sdev->sdev_state = SDEV_CREATED; |
302 | INIT_LIST_HEAD(&sdev->siblings); | |
303 | INIT_LIST_HEAD(&sdev->same_target_siblings); | |
1da177e4 | 304 | INIT_LIST_HEAD(&sdev->starved_entry); |
a341cd0f | 305 | INIT_LIST_HEAD(&sdev->event_list); |
1da177e4 | 306 | spin_lock_init(&sdev->list_lock); |
09e2b0b1 | 307 | mutex_init(&sdev->inquiry_mutex); |
a341cd0f | 308 | INIT_WORK(&sdev->event_work, scsi_evt_thread); |
9937a5e2 | 309 | INIT_WORK(&sdev->requeue_work, scsi_requeue_run_queue); |
1da177e4 LT |
310 | |
311 | sdev->sdev_gendev.parent = get_device(&starget->dev); | |
312 | sdev->sdev_target = starget; | |
313 | ||
314 | /* usually NULL and set by ->slave_alloc instead */ | |
315 | sdev->hostdata = hostdata; | |
316 | ||
317 | /* if the device needs this changing, it may do so in the | |
318 | * slave_configure function */ | |
319 | sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED; | |
320 | ||
321 | /* | |
322 | * Some low level driver could use device->type | |
323 | */ | |
324 | sdev->type = -1; | |
325 | ||
326 | /* | |
327 | * Assume that the device will have handshaking problems, | |
328 | * and then fix this field later if it turns out it | |
329 | * doesn't | |
330 | */ | |
331 | sdev->borken = 1; | |
332 | ||
1e61c1a8 CH |
333 | sdev->sg_reserved_size = INT_MAX; |
334 | ||
59506abe BVA |
335 | q = blk_mq_init_queue(&sdev->host->tag_set); |
336 | if (IS_ERR(q)) { | |
1da177e4 LT |
337 | /* release fn is set up in scsi_sysfs_device_initialise, so |
338 | * have to free and put manually here */ | |
339 | put_device(&starget->dev); | |
93f56089 | 340 | kfree(sdev); |
1da177e4 LT |
341 | goto out; |
342 | } | |
8fe4ce58 | 343 | kref_get(&sdev->host->tagset_refcnt); |
59506abe BVA |
344 | sdev->request_queue = q; |
345 | q->queuedata = sdev; | |
346 | __scsi_init_queue(sdev->host, q); | |
2ecb204d | 347 | |
020b0f0a ML |
348 | depth = sdev->host->cmd_per_lun ?: 1; |
349 | ||
350 | /* | |
351 | * Use .can_queue as budget map's depth because we have to | |
352 | * support adjusting queue depth from sysfs. Meantime use | |
353 | * default device queue depth to figure out sbitmap shift | |
354 | * since we use this queue depth most of times. | |
355 | */ | |
edb854a3 | 356 | if (scsi_realloc_sdev_budget_map(sdev, depth)) { |
020b0f0a ML |
357 | put_device(&starget->dev); |
358 | kfree(sdev); | |
359 | goto out; | |
360 | } | |
361 | ||
362 | scsi_change_queue_depth(sdev, depth); | |
1da177e4 LT |
363 | |
364 | scsi_sysfs_device_initialize(sdev); | |
365 | ||
366 | if (shost->hostt->slave_alloc) { | |
367 | ret = shost->hostt->slave_alloc(sdev); | |
368 | if (ret) { | |
369 | /* | |
370 | * if LLDD reports slave not present, don't clutter | |
371 | * console with alloc failure messages | |
1da177e4 LT |
372 | */ |
373 | if (ret == -ENXIO) | |
374 | display_failure_msg = 0; | |
375 | goto out_device_destroy; | |
376 | } | |
377 | } | |
378 | ||
379 | return sdev; | |
380 | ||
381 | out_device_destroy: | |
4e6c82b3 | 382 | __scsi_remove_device(sdev); |
1da177e4 LT |
383 | out: |
384 | if (display_failure_msg) | |
cadbd4a5 | 385 | printk(ALLOC_FAILURE_MSG, __func__); |
1da177e4 LT |
386 | return NULL; |
387 | } | |
388 | ||
643eb2d9 JB |
389 | static void scsi_target_destroy(struct scsi_target *starget) |
390 | { | |
391 | struct device *dev = &starget->dev; | |
392 | struct Scsi_Host *shost = dev_to_shost(dev->parent); | |
393 | unsigned long flags; | |
394 | ||
f05795d3 | 395 | BUG_ON(starget->state == STARGET_DEL); |
f2495e22 | 396 | starget->state = STARGET_DEL; |
643eb2d9 JB |
397 | transport_destroy_device(dev); |
398 | spin_lock_irqsave(shost->host_lock, flags); | |
399 | if (shost->hostt->target_destroy) | |
400 | shost->hostt->target_destroy(starget); | |
401 | list_del_init(&starget->siblings); | |
402 | spin_unlock_irqrestore(shost->host_lock, flags); | |
403 | put_device(dev); | |
404 | } | |
405 | ||
1da177e4 LT |
406 | static void scsi_target_dev_release(struct device *dev) |
407 | { | |
408 | struct device *parent = dev->parent; | |
409 | struct scsi_target *starget = to_scsi_target(dev); | |
a283bd37 | 410 | |
1da177e4 LT |
411 | kfree(starget); |
412 | put_device(parent); | |
413 | } | |
414 | ||
453cd0f3 | 415 | static struct device_type scsi_target_type = { |
b0ed4336 HR |
416 | .name = "scsi_target", |
417 | .release = scsi_target_dev_release, | |
418 | }; | |
419 | ||
1da177e4 LT |
420 | int scsi_is_target_device(const struct device *dev) |
421 | { | |
b0ed4336 | 422 | return dev->type == &scsi_target_type; |
1da177e4 LT |
423 | } |
424 | EXPORT_SYMBOL(scsi_is_target_device); | |
425 | ||
426 | static struct scsi_target *__scsi_find_target(struct device *parent, | |
427 | int channel, uint id) | |
428 | { | |
429 | struct scsi_target *starget, *found_starget = NULL; | |
430 | struct Scsi_Host *shost = dev_to_shost(parent); | |
431 | /* | |
432 | * Search for an existing target for this sdev. | |
433 | */ | |
434 | list_for_each_entry(starget, &shost->__targets, siblings) { | |
435 | if (starget->id == id && | |
436 | starget->channel == channel) { | |
437 | found_starget = starget; | |
438 | break; | |
439 | } | |
440 | } | |
441 | if (found_starget) | |
442 | get_device(&found_starget->dev); | |
443 | ||
444 | return found_starget; | |
445 | } | |
446 | ||
e63ed0d7 JB |
447 | /** |
448 | * scsi_target_reap_ref_release - remove target from visibility | |
449 | * @kref: the reap_ref in the target being released | |
450 | * | |
451 | * Called on last put of reap_ref, which is the indication that no device | |
452 | * under this target is visible anymore, so render the target invisible in | |
453 | * sysfs. Note: we have to be in user context here because the target reaps | |
454 | * should be done in places where the scsi device visibility is being removed. | |
455 | */ | |
456 | static void scsi_target_reap_ref_release(struct kref *kref) | |
457 | { | |
458 | struct scsi_target *starget | |
459 | = container_of(kref, struct scsi_target, reap_ref); | |
460 | ||
f2495e22 | 461 | /* |
f9279c96 | 462 | * if we get here and the target is still in a CREATED state that |
f2495e22 JB |
463 | * means it was allocated but never made visible (because a scan |
464 | * turned up no LUNs), so don't call device_del() on it. | |
465 | */ | |
f9279c96 EM |
466 | if ((starget->state != STARGET_CREATED) && |
467 | (starget->state != STARGET_CREATED_REMOVE)) { | |
f2495e22 JB |
468 | transport_remove_device(&starget->dev); |
469 | device_del(&starget->dev); | |
470 | } | |
e63ed0d7 JB |
471 | scsi_target_destroy(starget); |
472 | } | |
473 | ||
474 | static void scsi_target_reap_ref_put(struct scsi_target *starget) | |
475 | { | |
476 | kref_put(&starget->reap_ref, scsi_target_reap_ref_release); | |
477 | } | |
478 | ||
884d25cc JB |
479 | /** |
480 | * scsi_alloc_target - allocate a new or find an existing target | |
481 | * @parent: parent of the target (need not be a scsi host) | |
482 | * @channel: target channel number (zero if no channels) | |
483 | * @id: target id number | |
484 | * | |
485 | * Return an existing target if one exists, provided it hasn't already | |
486 | * gone into STARGET_DEL state, otherwise allocate a new target. | |
487 | * | |
488 | * The target is returned with an incremented reference, so the caller | |
489 | * is responsible for both reaping and doing a last put | |
490 | */ | |
1da177e4 LT |
491 | static struct scsi_target *scsi_alloc_target(struct device *parent, |
492 | int channel, uint id) | |
493 | { | |
494 | struct Scsi_Host *shost = dev_to_shost(parent); | |
495 | struct device *dev = NULL; | |
496 | unsigned long flags; | |
497 | const int size = sizeof(struct scsi_target) | |
498 | + shost->transportt->target_size; | |
5c44cd2a | 499 | struct scsi_target *starget; |
1da177e4 | 500 | struct scsi_target *found_target; |
e63ed0d7 | 501 | int error, ref_got; |
1da177e4 | 502 | |
24669f75 | 503 | starget = kzalloc(size, GFP_KERNEL); |
1da177e4 | 504 | if (!starget) { |
cadbd4a5 | 505 | printk(KERN_ERR "%s: allocation failure\n", __func__); |
1da177e4 LT |
506 | return NULL; |
507 | } | |
1da177e4 LT |
508 | dev = &starget->dev; |
509 | device_initialize(dev); | |
e63ed0d7 | 510 | kref_init(&starget->reap_ref); |
1da177e4 | 511 | dev->parent = get_device(parent); |
71610f55 | 512 | dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id); |
b0ed4336 | 513 | dev->bus = &scsi_bus_type; |
b0ed4336 | 514 | dev->type = &scsi_target_type; |
a19a93e4 | 515 | scsi_enable_async_suspend(dev); |
1da177e4 LT |
516 | starget->id = id; |
517 | starget->channel = channel; | |
f0c0a376 | 518 | starget->can_queue = 0; |
1da177e4 LT |
519 | INIT_LIST_HEAD(&starget->siblings); |
520 | INIT_LIST_HEAD(&starget->devices); | |
643eb2d9 | 521 | starget->state = STARGET_CREATED; |
7c9d6f16 | 522 | starget->scsi_level = SCSI_2; |
c53a284f | 523 | starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED; |
ffedb452 | 524 | retry: |
1da177e4 LT |
525 | spin_lock_irqsave(shost->host_lock, flags); |
526 | ||
527 | found_target = __scsi_find_target(parent, channel, id); | |
528 | if (found_target) | |
529 | goto found; | |
530 | ||
531 | list_add_tail(&starget->siblings, &shost->__targets); | |
532 | spin_unlock_irqrestore(shost->host_lock, flags); | |
533 | /* allocate and add */ | |
a283bd37 | 534 | transport_setup_device(dev); |
a283bd37 | 535 | if (shost->hostt->target_alloc) { |
32f95792 | 536 | error = shost->hostt->target_alloc(starget); |
a283bd37 JB |
537 | |
538 | if(error) { | |
70edd2e6 SR |
539 | if (error != -ENXIO) |
540 | dev_err(dev, "target allocation failed, error %d\n", error); | |
a283bd37 JB |
541 | /* don't want scsi_target_reap to do the final |
542 | * put because it will be under the host lock */ | |
643eb2d9 | 543 | scsi_target_destroy(starget); |
a283bd37 JB |
544 | return NULL; |
545 | } | |
546 | } | |
884d25cc | 547 | get_device(dev); |
a283bd37 | 548 | |
1da177e4 LT |
549 | return starget; |
550 | ||
551 | found: | |
e63ed0d7 JB |
552 | /* |
553 | * release routine already fired if kref is zero, so if we can still | |
554 | * take the reference, the target must be alive. If we can't, it must | |
555 | * be dying and we need to wait for a new target | |
556 | */ | |
557 | ref_got = kref_get_unless_zero(&found_target->reap_ref); | |
558 | ||
1da177e4 | 559 | spin_unlock_irqrestore(shost->host_lock, flags); |
e63ed0d7 | 560 | if (ref_got) { |
12fb8c15 | 561 | put_device(dev); |
ffedb452 JB |
562 | return found_target; |
563 | } | |
e63ed0d7 JB |
564 | /* |
565 | * Unfortunately, we found a dying target; need to wait until it's | |
566 | * dead before we can get a new one. There is an anomaly here. We | |
567 | * *should* call scsi_target_reap() to balance the kref_get() of the | |
568 | * reap_ref above. However, since the target being released, it's | |
569 | * already invisible and the reap_ref is irrelevant. If we call | |
570 | * scsi_target_reap() we might spuriously do another device_del() on | |
571 | * an already invisible target. | |
572 | */ | |
ffedb452 | 573 | put_device(&found_target->dev); |
e63ed0d7 JB |
574 | /* |
575 | * length of time is irrelevant here, we just want to yield the CPU | |
576 | * for a tick to avoid busy waiting for the target to die. | |
577 | */ | |
578 | msleep(1); | |
ffedb452 | 579 | goto retry; |
1da177e4 LT |
580 | } |
581 | ||
582 | /** | |
583 | * scsi_target_reap - check to see if target is in use and destroy if not | |
1da177e4 LT |
584 | * @starget: target to be checked |
585 | * | |
586 | * This is used after removing a LUN or doing a last put of the target | |
587 | * it checks atomically that nothing is using the target and removes | |
588 | * it if so. | |
589 | */ | |
590 | void scsi_target_reap(struct scsi_target *starget) | |
591 | { | |
f2495e22 JB |
592 | /* |
593 | * serious problem if this triggers: STARGET_DEL is only set in the if | |
594 | * the reap_ref drops to zero, so we're trying to do another final put | |
595 | * on an already released kref | |
596 | */ | |
e63ed0d7 | 597 | BUG_ON(starget->state == STARGET_DEL); |
f2495e22 | 598 | scsi_target_reap_ref_put(starget); |
1da177e4 LT |
599 | } |
600 | ||
e5b3cd42 | 601 | /** |
3846470a DB |
602 | * scsi_sanitize_inquiry_string - remove non-graphical chars from an |
603 | * INQUIRY result string | |
e5b3cd42 AS |
604 | * @s: INQUIRY result string to sanitize |
605 | * @len: length of the string | |
606 | * | |
607 | * Description: | |
608 | * The SCSI spec says that INQUIRY vendor, product, and revision | |
609 | * strings must consist entirely of graphic ASCII characters, | |
610 | * padded on the right with spaces. Since not all devices obey | |
611 | * this rule, we will replace non-graphic or non-ASCII characters | |
612 | * with spaces. Exception: a NUL character is interpreted as a | |
613 | * string terminator, so all the following characters are set to | |
614 | * spaces. | |
615 | **/ | |
3846470a | 616 | void scsi_sanitize_inquiry_string(unsigned char *s, int len) |
e5b3cd42 AS |
617 | { |
618 | int terminated = 0; | |
619 | ||
620 | for (; len > 0; (--len, ++s)) { | |
621 | if (*s == 0) | |
622 | terminated = 1; | |
623 | if (terminated || *s < 0x20 || *s > 0x7e) | |
624 | *s = ' '; | |
625 | } | |
626 | } | |
3846470a | 627 | EXPORT_SYMBOL(scsi_sanitize_inquiry_string); |
e5b3cd42 | 628 | |
1da177e4 LT |
629 | /** |
630 | * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY | |
39216033 | 631 | * @sdev: scsi_device to probe |
1da177e4 | 632 | * @inq_result: area to store the INQUIRY result |
39216033 | 633 | * @result_len: len of inq_result |
1da177e4 LT |
634 | * @bflags: store any bflags found here |
635 | * | |
636 | * Description: | |
39216033 | 637 | * Probe the lun associated with @req using a standard SCSI INQUIRY; |
1da177e4 | 638 | * |
39216033 | 639 | * If the INQUIRY is successful, zero is returned and the |
1da177e4 | 640 | * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length |
f64a181d | 641 | * are copied to the scsi_device any flags value is stored in *@bflags. |
1da177e4 | 642 | **/ |
e5b3cd42 | 643 | static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result, |
5ebde469 | 644 | int result_len, blist_flags_t *bflags) |
1da177e4 | 645 | { |
1da177e4 LT |
646 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
647 | int first_inquiry_len, try_inquiry_len, next_inquiry_len; | |
648 | int response_len = 0; | |
7dfe0b5e | 649 | int pass, count, result, resid; |
1da177e4 | 650 | struct scsi_sense_hdr sshdr; |
7dfe0b5e MC |
651 | const struct scsi_exec_args exec_args = { |
652 | .sshdr = &sshdr, | |
653 | .resid = &resid, | |
654 | }; | |
1da177e4 LT |
655 | |
656 | *bflags = 0; | |
657 | ||
658 | /* Perform up to 3 passes. The first pass uses a conservative | |
659 | * transfer length of 36 unless sdev->inquiry_len specifies a | |
660 | * different value. */ | |
661 | first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36; | |
662 | try_inquiry_len = first_inquiry_len; | |
663 | pass = 1; | |
664 | ||
665 | next_pass: | |
9ccfc756 JB |
666 | SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
667 | "scsi scan: INQUIRY pass %d length %d\n", | |
668 | pass, try_inquiry_len)); | |
1da177e4 LT |
669 | |
670 | /* Each pass gets up to three chances to ignore Unit Attention */ | |
671 | for (count = 0; count < 3; ++count) { | |
672 | memset(scsi_cmd, 0, 6); | |
673 | scsi_cmd[0] = INQUIRY; | |
674 | scsi_cmd[4] = (unsigned char) try_inquiry_len; | |
1da177e4 LT |
675 | |
676 | memset(inq_result, 0, try_inquiry_len); | |
39216033 | 677 | |
7dfe0b5e MC |
678 | result = scsi_execute_cmd(sdev, scsi_cmd, REQ_OP_DRV_IN, |
679 | inq_result, try_inquiry_len, | |
f4f4e47e | 680 | HZ / 2 + HZ * scsi_inq_timeout, 3, |
7dfe0b5e | 681 | &exec_args); |
1da177e4 | 682 | |
91921e01 HR |
683 | SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
684 | "scsi scan: INQUIRY %s with code 0x%x\n", | |
39216033 | 685 | result ? "failed" : "successful", result)); |
1da177e4 | 686 | |
ced202f7 | 687 | if (result > 0) { |
1da177e4 LT |
688 | /* |
689 | * not-ready to ready transition [asc/ascq=0x28/0x0] | |
690 | * or power-on, reset [asc/ascq=0x29/0x0], continue. | |
691 | * INQUIRY should not yield UNIT_ATTENTION | |
692 | * but many buggy devices do so anyway. | |
693 | */ | |
464a00c9 | 694 | if (scsi_status_is_check_condition(result) && |
ea73a9f2 | 695 | scsi_sense_valid(&sshdr)) { |
1da177e4 LT |
696 | if ((sshdr.sense_key == UNIT_ATTENTION) && |
697 | ((sshdr.asc == 0x28) || | |
698 | (sshdr.asc == 0x29)) && | |
699 | (sshdr.ascq == 0)) | |
700 | continue; | |
701 | } | |
ced202f7 | 702 | } else if (result == 0) { |
5cd3bbfa FT |
703 | /* |
704 | * if nothing was transferred, we try | |
705 | * again. It's a workaround for some USB | |
706 | * devices. | |
707 | */ | |
708 | if (resid == try_inquiry_len) | |
709 | continue; | |
1da177e4 LT |
710 | } |
711 | break; | |
712 | } | |
713 | ||
39216033 | 714 | if (result == 0) { |
3846470a DB |
715 | scsi_sanitize_inquiry_string(&inq_result[8], 8); |
716 | scsi_sanitize_inquiry_string(&inq_result[16], 16); | |
717 | scsi_sanitize_inquiry_string(&inq_result[32], 4); | |
e5b3cd42 AS |
718 | |
719 | response_len = inq_result[4] + 5; | |
1da177e4 LT |
720 | if (response_len > 255) |
721 | response_len = first_inquiry_len; /* sanity */ | |
722 | ||
723 | /* | |
724 | * Get any flags for this device. | |
725 | * | |
f64a181d CH |
726 | * XXX add a bflags to scsi_device, and replace the |
727 | * corresponding bit fields in scsi_device, so bflags | |
1da177e4 LT |
728 | * need not be passed as an argument. |
729 | */ | |
730 | *bflags = scsi_get_device_flags(sdev, &inq_result[8], | |
731 | &inq_result[16]); | |
732 | ||
733 | /* When the first pass succeeds we gain information about | |
734 | * what larger transfer lengths might work. */ | |
735 | if (pass == 1) { | |
736 | if (BLIST_INQUIRY_36 & *bflags) | |
737 | next_inquiry_len = 36; | |
d657700c MP |
738 | /* |
739 | * LLD specified a maximum sdev->inquiry_len | |
740 | * but device claims it has more data. Capping | |
741 | * the length only makes sense for legacy | |
742 | * devices. If a device supports SPC-4 (2014) | |
743 | * or newer, assume that it is safe to ask for | |
744 | * as much as the device says it supports. | |
745 | */ | |
746 | else if (sdev->inquiry_len && | |
747 | response_len > sdev->inquiry_len && | |
748 | (inq_result[2] & 0x7) < 6) /* SPC-4 */ | |
1da177e4 LT |
749 | next_inquiry_len = sdev->inquiry_len; |
750 | else | |
751 | next_inquiry_len = response_len; | |
752 | ||
753 | /* If more data is available perform the second pass */ | |
754 | if (next_inquiry_len > try_inquiry_len) { | |
755 | try_inquiry_len = next_inquiry_len; | |
756 | pass = 2; | |
757 | goto next_pass; | |
758 | } | |
759 | } | |
760 | ||
761 | } else if (pass == 2) { | |
91921e01 HR |
762 | sdev_printk(KERN_INFO, sdev, |
763 | "scsi scan: %d byte inquiry failed. " | |
764 | "Consider BLIST_INQUIRY_36 for this device\n", | |
765 | try_inquiry_len); | |
1da177e4 LT |
766 | |
767 | /* If this pass failed, the third pass goes back and transfers | |
768 | * the same amount as we successfully got in the first pass. */ | |
769 | try_inquiry_len = first_inquiry_len; | |
770 | pass = 3; | |
771 | goto next_pass; | |
772 | } | |
773 | ||
774 | /* If the last transfer attempt got an error, assume the | |
775 | * peripheral doesn't exist or is dead. */ | |
39216033 JB |
776 | if (result) |
777 | return -EIO; | |
1da177e4 LT |
778 | |
779 | /* Don't report any more data than the device says is valid */ | |
780 | sdev->inquiry_len = min(try_inquiry_len, response_len); | |
781 | ||
782 | /* | |
783 | * XXX Abort if the response length is less than 36? If less than | |
784 | * 32, the lookup of the device flags (above) could be invalid, | |
785 | * and it would be possible to take an incorrect action - we do | |
786 | * not want to hang because of a short INQUIRY. On the flip side, | |
787 | * if the device is spun down or becoming ready (and so it gives a | |
788 | * short INQUIRY), an abort here prevents any further use of the | |
789 | * device, including spin up. | |
790 | * | |
e423ee31 AS |
791 | * On the whole, the best approach seems to be to assume the first |
792 | * 36 bytes are valid no matter what the device says. That's | |
793 | * better than copying < 36 bytes to the inquiry-result buffer | |
794 | * and displaying garbage for the Vendor, Product, or Revision | |
795 | * strings. | |
796 | */ | |
797 | if (sdev->inquiry_len < 36) { | |
a35bb445 VK |
798 | if (!sdev->host->short_inquiry) { |
799 | shost_printk(KERN_INFO, sdev->host, | |
800 | "scsi scan: INQUIRY result too short (%d)," | |
801 | " using 36\n", sdev->inquiry_len); | |
802 | sdev->host->short_inquiry = 1; | |
803 | } | |
e423ee31 AS |
804 | sdev->inquiry_len = 36; |
805 | } | |
806 | ||
807 | /* | |
1da177e4 LT |
808 | * Related to the above issue: |
809 | * | |
810 | * XXX Devices (disk or all?) should be sent a TEST UNIT READY, | |
811 | * and if not ready, sent a START_STOP to start (maybe spin up) and | |
812 | * then send the INQUIRY again, since the INQUIRY can change after | |
813 | * a device is initialized. | |
814 | * | |
815 | * Ideally, start a device if explicitly asked to do so. This | |
816 | * assumes that a device is spun up on power on, spun down on | |
817 | * request, and then spun up on request. | |
818 | */ | |
819 | ||
820 | /* | |
821 | * The scanning code needs to know the scsi_level, even if no | |
822 | * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so | |
823 | * non-zero LUNs can be scanned. | |
824 | */ | |
825 | sdev->scsi_level = inq_result[2] & 0x07; | |
826 | if (sdev->scsi_level >= 2 || | |
827 | (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1)) | |
828 | sdev->scsi_level++; | |
6f3a2024 | 829 | sdev->sdev_target->scsi_level = sdev->scsi_level; |
1da177e4 | 830 | |
50c4e964 AS |
831 | /* |
832 | * If SCSI-2 or lower, and if the transport requires it, | |
833 | * store the LUN value in CDB[1]. | |
834 | */ | |
835 | sdev->lun_in_cdb = 0; | |
836 | if (sdev->scsi_level <= SCSI_2 && | |
837 | sdev->scsi_level != SCSI_UNKNOWN && | |
838 | !sdev->host->no_scsi2_lun_in_cdb) | |
839 | sdev->lun_in_cdb = 1; | |
840 | ||
39216033 | 841 | return 0; |
1da177e4 LT |
842 | } |
843 | ||
844 | /** | |
f64a181d | 845 | * scsi_add_lun - allocate and fully initialze a scsi_device |
6d877688 | 846 | * @sdev: holds information to be stored in the new scsi_device |
1da177e4 LT |
847 | * @inq_result: holds the result of a previous INQUIRY to the LUN |
848 | * @bflags: black/white list flag | |
6d877688 | 849 | * @async: 1 if this device is being scanned asynchronously |
1da177e4 LT |
850 | * |
851 | * Description: | |
6d877688 MW |
852 | * Initialize the scsi_device @sdev. Optionally set fields based |
853 | * on values in *@bflags. | |
1da177e4 LT |
854 | * |
855 | * Return: | |
f64a181d CH |
856 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device |
857 | * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized | |
1da177e4 | 858 | **/ |
e5b3cd42 | 859 | static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, |
093b8886 | 860 | blist_flags_t *bflags, int async) |
1da177e4 | 861 | { |
6f4267e3 JB |
862 | int ret; |
863 | ||
1da177e4 LT |
864 | /* |
865 | * XXX do not save the inquiry, since it can change underneath us, | |
866 | * save just vendor/model/rev. | |
867 | * | |
868 | * Rather than save it and have an ioctl that retrieves the saved | |
869 | * value, have an ioctl that executes the same INQUIRY code used | |
870 | * in scsi_probe_lun, let user level programs doing INQUIRY | |
871 | * scanning run at their own risk, or supply a user level program | |
872 | * that can correctly scan. | |
873 | */ | |
09123d23 AS |
874 | |
875 | /* | |
876 | * Copy at least 36 bytes of INQUIRY data, so that we don't | |
877 | * dereference unallocated memory when accessing the Vendor, | |
878 | * Product, and Revision strings. Badly behaved devices may set | |
879 | * the INQUIRY Additional Length byte to a small value, indicating | |
880 | * these strings are invalid, but often they contain plausible data | |
881 | * nonetheless. It doesn't matter if the device sent < 36 bytes | |
882 | * total, since scsi_probe_lun() initializes inq_result with 0s. | |
883 | */ | |
884 | sdev->inquiry = kmemdup(inq_result, | |
885 | max_t(size_t, sdev->inquiry_len, 36), | |
1749ef00 | 886 | GFP_KERNEL); |
09123d23 | 887 | if (sdev->inquiry == NULL) |
1da177e4 | 888 | return SCSI_SCAN_NO_RESPONSE; |
1da177e4 | 889 | |
1da177e4 LT |
890 | sdev->vendor = (char *) (sdev->inquiry + 8); |
891 | sdev->model = (char *) (sdev->inquiry + 16); | |
892 | sdev->rev = (char *) (sdev->inquiry + 32); | |
893 | ||
14216561 JB |
894 | if (strncmp(sdev->vendor, "ATA ", 8) == 0) { |
895 | /* | |
896 | * sata emulation layer device. This is a hack to work around | |
897 | * the SATL power management specifications which state that | |
898 | * when the SATL detects the device has gone into standby | |
899 | * mode, it shall respond with NOT READY. | |
900 | */ | |
901 | sdev->allow_restart = 1; | |
902 | } | |
903 | ||
1da177e4 | 904 | if (*bflags & BLIST_ISROM) { |
6d877688 MW |
905 | sdev->type = TYPE_ROM; |
906 | sdev->removable = 1; | |
907 | } else { | |
908 | sdev->type = (inq_result[0] & 0x1f); | |
909 | sdev->removable = (inq_result[1] & 0x80) >> 7; | |
45341ca3 SJ |
910 | |
911 | /* | |
912 | * some devices may respond with wrong type for | |
913 | * well-known logical units. Force well-known type | |
914 | * to enumerate them correctly. | |
915 | */ | |
916 | if (scsi_is_wlun(sdev->lun) && sdev->type != TYPE_WLUN) { | |
917 | sdev_printk(KERN_WARNING, sdev, | |
918 | "%s: correcting incorrect peripheral device type 0x%x for W-LUN 0x%16xhN\n", | |
919 | __func__, sdev->type, (unsigned int)sdev->lun); | |
920 | sdev->type = TYPE_WLUN; | |
921 | } | |
922 | ||
6d877688 | 923 | } |
1da177e4 | 924 | |
6d877688 MW |
925 | if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) { |
926 | /* RBC and MMC devices can return SCSI-3 compliance and yet | |
927 | * still not support REPORT LUNS, so make them act as | |
928 | * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is | |
929 | * specifically set */ | |
930 | if ((*bflags & BLIST_REPORTLUN2) == 0) | |
931 | *bflags |= BLIST_NOREPORTLUN; | |
932 | } | |
933 | ||
1da177e4 LT |
934 | /* |
935 | * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI | |
936 | * spec says: The device server is capable of supporting the | |
937 | * specified peripheral device type on this logical unit. However, | |
938 | * the physical device is not currently connected to this logical | |
939 | * unit. | |
940 | * | |
941 | * The above is vague, as it implies that we could treat 001 and | |
942 | * 011 the same. Stay compatible with previous code, and create a | |
f64a181d | 943 | * scsi_device for a PQ of 1 |
1da177e4 LT |
944 | * |
945 | * Don't set the device offline here; rather let the upper | |
946 | * level drivers eval the PQ to decide whether they should | |
947 | * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check. | |
948 | */ | |
949 | ||
950 | sdev->inq_periph_qual = (inq_result[0] >> 5) & 7; | |
1da177e4 LT |
951 | sdev->lockable = sdev->removable; |
952 | sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2); | |
953 | ||
6d877688 MW |
954 | if (sdev->scsi_level >= SCSI_3 || |
955 | (sdev->inquiry_len > 56 && inq_result[56] & 0x04)) | |
1da177e4 LT |
956 | sdev->ppr = 1; |
957 | if (inq_result[7] & 0x60) | |
958 | sdev->wdtr = 1; | |
959 | if (inq_result[7] & 0x10) | |
960 | sdev->sdtr = 1; | |
961 | ||
19ac0db3 | 962 | sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d " |
4ff36718 MW |
963 | "ANSI: %d%s\n", scsi_device_type(sdev->type), |
964 | sdev->vendor, sdev->model, sdev->rev, | |
965 | sdev->inq_periph_qual, inq_result[2] & 0x07, | |
966 | (inq_result[3] & 0x0f) == 1 ? " CCS" : ""); | |
967 | ||
1da177e4 | 968 | if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) && |
c8b09f6f | 969 | !(*bflags & BLIST_NOTQ)) { |
1da177e4 | 970 | sdev->tagged_supported = 1; |
c8b09f6f CH |
971 | sdev->simple_tags = 1; |
972 | } | |
6d877688 | 973 | |
1da177e4 LT |
974 | /* |
975 | * Some devices (Texel CD ROM drives) have handshaking problems | |
976 | * when used with the Seagate controllers. borken is initialized | |
977 | * to 1, and then set it to 0 here. | |
978 | */ | |
979 | if ((*bflags & BLIST_BORKEN) == 0) | |
980 | sdev->borken = 0; | |
981 | ||
6d877688 MW |
982 | if (*bflags & BLIST_NO_ULD_ATTACH) |
983 | sdev->no_uld_attach = 1; | |
984 | ||
1da177e4 LT |
985 | /* |
986 | * Apparently some really broken devices (contrary to the SCSI | |
987 | * standards) need to be selected without asserting ATN | |
988 | */ | |
989 | if (*bflags & BLIST_SELECT_NO_ATN) | |
990 | sdev->select_no_atn = 1; | |
991 | ||
4d7db04a JB |
992 | /* |
993 | * Maximum 512 sector transfer length | |
994 | * broken RA4x00 Compaq Disk Array | |
995 | */ | |
996 | if (*bflags & BLIST_MAX_512) | |
086fa5ff | 997 | blk_queue_max_hw_sectors(sdev->request_queue, 512); |
35e9a9f9 MC |
998 | /* |
999 | * Max 1024 sector transfer length for targets that report incorrect | |
1000 | * max/optimal lengths and relied on the old block layer safe default | |
1001 | */ | |
1002 | else if (*bflags & BLIST_MAX_1024) | |
1003 | blk_queue_max_hw_sectors(sdev->request_queue, 1024); | |
4d7db04a | 1004 | |
1da177e4 LT |
1005 | /* |
1006 | * Some devices may not want to have a start command automatically | |
1007 | * issued when a device is added. | |
1008 | */ | |
1009 | if (*bflags & BLIST_NOSTARTONADD) | |
1010 | sdev->no_start_on_add = 1; | |
1011 | ||
1012 | if (*bflags & BLIST_SINGLELUN) | |
25d7c363 | 1013 | scsi_target(sdev)->single_lun = 1; |
1da177e4 | 1014 | |
1da177e4 LT |
1015 | sdev->use_10_for_rw = 1; |
1016 | ||
0213436a JD |
1017 | /* some devices don't like REPORT SUPPORTED OPERATION CODES |
1018 | * and will simply timeout causing sd_mod init to take a very | |
1019 | * very long time */ | |
1020 | if (*bflags & BLIST_NO_RSOC) | |
1021 | sdev->no_report_opcodes = 1; | |
1022 | ||
1da177e4 LT |
1023 | /* set the device running here so that slave configure |
1024 | * may do I/O */ | |
0db6ca8a | 1025 | mutex_lock(&sdev->state_mutex); |
6f4267e3 | 1026 | ret = scsi_device_set_state(sdev, SDEV_RUNNING); |
0db6ca8a | 1027 | if (ret) |
6f4267e3 | 1028 | ret = scsi_device_set_state(sdev, SDEV_BLOCK); |
0db6ca8a | 1029 | mutex_unlock(&sdev->state_mutex); |
6f4267e3 | 1030 | |
0db6ca8a BVA |
1031 | if (ret) { |
1032 | sdev_printk(KERN_ERR, sdev, | |
1033 | "in wrong state %s to complete scan\n", | |
1034 | scsi_device_state_name(sdev->sdev_state)); | |
1035 | return SCSI_SCAN_NO_RESPONSE; | |
6f4267e3 | 1036 | } |
1da177e4 | 1037 | |
1da177e4 LT |
1038 | if (*bflags & BLIST_NOT_LOCKABLE) |
1039 | sdev->lockable = 0; | |
1040 | ||
1041 | if (*bflags & BLIST_RETRY_HWERROR) | |
1042 | sdev->retry_hwerror = 1; | |
1043 | ||
d974e426 MP |
1044 | if (*bflags & BLIST_NO_DIF) |
1045 | sdev->no_dif = 1; | |
1046 | ||
28a0bc41 MP |
1047 | if (*bflags & BLIST_UNMAP_LIMIT_WS) |
1048 | sdev->unmap_limit_for_ws = 1; | |
1049 | ||
f591a2e0 MK |
1050 | if (*bflags & BLIST_IGN_MEDIA_CHANGE) |
1051 | sdev->ignore_media_change = 1; | |
1052 | ||
0816c925 MP |
1053 | sdev->eh_timeout = SCSI_DEFAULT_EH_TIMEOUT; |
1054 | ||
c1d40a52 MP |
1055 | if (*bflags & BLIST_TRY_VPD_PAGES) |
1056 | sdev->try_vpd_pages = 1; | |
1057 | else if (*bflags & BLIST_SKIP_VPD_PAGES) | |
56f2a801 MP |
1058 | sdev->skip_vpd_pages = 1; |
1059 | ||
4b1a2c2a LD |
1060 | if (*bflags & BLIST_NO_VPD_SIZE) |
1061 | sdev->no_vpd_size = 1; | |
1062 | ||
1da177e4 LT |
1063 | transport_configure_device(&sdev->sdev_gendev); |
1064 | ||
93805091 | 1065 | if (sdev->host->hostt->slave_configure) { |
6f4267e3 | 1066 | ret = sdev->host->hostt->slave_configure(sdev); |
93805091 CH |
1067 | if (ret) { |
1068 | /* | |
1069 | * if LLDD reports slave not present, don't clutter | |
1070 | * console with alloc failure messages | |
1071 | */ | |
1072 | if (ret != -ENXIO) { | |
1073 | sdev_printk(KERN_ERR, sdev, | |
1074 | "failed to configure device\n"); | |
1075 | } | |
1076 | return SCSI_SCAN_NO_RESPONSE; | |
1077 | } | |
edb854a3 ML |
1078 | |
1079 | /* | |
1080 | * The queue_depth is often changed in ->slave_configure. | |
1081 | * Set up budget map again since memory consumption of | |
1082 | * the map depends on actual queue depth. | |
1083 | */ | |
1084 | scsi_realloc_sdev_budget_map(sdev, sdev->queue_depth); | |
93805091 | 1085 | } |
1da177e4 | 1086 | |
b3ae8780 HR |
1087 | if (sdev->scsi_level >= SCSI_3) |
1088 | scsi_attach_vpd(sdev); | |
1089 | ||
62488520 DLM |
1090 | scsi_cdl_check(sdev); |
1091 | ||
4a84067d | 1092 | sdev->max_queue_depth = sdev->queue_depth; |
020b0f0a | 1093 | WARN_ON_ONCE(sdev->max_queue_depth > sdev->budget_map.depth); |
345e2960 | 1094 | sdev->sdev_bflags = *bflags; |
4a84067d | 1095 | |
1da177e4 LT |
1096 | /* |
1097 | * Ok, the device is now all set up, we can | |
1098 | * register it and tell the rest of the kernel | |
1099 | * about it. | |
1100 | */ | |
3e082a91 | 1101 | if (!async && scsi_sysfs_add_sdev(sdev) != 0) |
b24b1033 | 1102 | return SCSI_SCAN_NO_RESPONSE; |
1da177e4 LT |
1103 | |
1104 | return SCSI_SCAN_LUN_PRESENT; | |
1105 | } | |
1106 | ||
c5f2e640 | 1107 | #ifdef CONFIG_SCSI_LOGGING |
6c7154c9 | 1108 | /** |
eb44820c | 1109 | * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace |
6c7154c9 KG |
1110 | * @buf: Output buffer with at least end-first+1 bytes of space |
1111 | * @inq: Inquiry buffer (input) | |
1112 | * @first: Offset of string into inq | |
1113 | * @end: Index after last character in inq | |
1114 | */ | |
c5f2e640 | 1115 | static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq, |
6c7154c9 KG |
1116 | unsigned first, unsigned end) |
1117 | { | |
1118 | unsigned term = 0, idx; | |
c5f2e640 | 1119 | |
1120 | for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) { | |
1121 | if (inq[idx+first] > ' ') { | |
6c7154c9 KG |
1122 | buf[idx] = inq[idx+first]; |
1123 | term = idx+1; | |
1124 | } else { | |
1125 | buf[idx] = ' '; | |
1126 | } | |
1127 | } | |
1128 | buf[term] = 0; | |
1129 | return buf; | |
1130 | } | |
c5f2e640 | 1131 | #endif |
6f3a2024 | 1132 | |
1da177e4 LT |
1133 | /** |
1134 | * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it | |
1135 | * @starget: pointer to target device structure | |
1136 | * @lun: LUN of target device | |
1da177e4 | 1137 | * @bflagsp: store bflags here if not NULL |
eb44820c | 1138 | * @sdevp: probe the LUN corresponding to this scsi_device |
1d645088 HR |
1139 | * @rescan: if not equal to SCSI_SCAN_INITIAL skip some code only |
1140 | * needed on first scan | |
eb44820c | 1141 | * @hostdata: passed to scsi_alloc_sdev() |
1da177e4 LT |
1142 | * |
1143 | * Description: | |
1144 | * Call scsi_probe_lun, if a LUN with an attached device is found, | |
1145 | * allocate and set it up by calling scsi_add_lun. | |
1146 | * | |
1147 | * Return: | |
739aca06 MCC |
1148 | * |
1149 | * - SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device | |
1150 | * - SCSI_SCAN_TARGET_PRESENT: target responded, but no device is | |
1da177e4 | 1151 | * attached at the LUN |
739aca06 | 1152 | * - SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized |
1da177e4 LT |
1153 | **/ |
1154 | static int scsi_probe_and_add_lun(struct scsi_target *starget, | |
093b8886 | 1155 | u64 lun, blist_flags_t *bflagsp, |
1d645088 HR |
1156 | struct scsi_device **sdevp, |
1157 | enum scsi_scan_mode rescan, | |
1da177e4 LT |
1158 | void *hostdata) |
1159 | { | |
1160 | struct scsi_device *sdev; | |
1da177e4 | 1161 | unsigned char *result; |
093b8886 BVA |
1162 | blist_flags_t bflags; |
1163 | int res = SCSI_SCAN_NO_RESPONSE, result_len = 256; | |
1da177e4 LT |
1164 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
1165 | ||
1166 | /* | |
1167 | * The rescan flag is used as an optimization, the first scan of a | |
1168 | * host adapter calls into here with rescan == 0. | |
1169 | */ | |
6f3a2024 JB |
1170 | sdev = scsi_device_lookup_by_target(starget, lun); |
1171 | if (sdev) { | |
1d645088 | 1172 | if (rescan != SCSI_SCAN_INITIAL || !scsi_device_created(sdev)) { |
91921e01 | 1173 | SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
1da177e4 | 1174 | "scsi scan: device exists on %s\n", |
71610f55 | 1175 | dev_name(&sdev->sdev_gendev))); |
1da177e4 LT |
1176 | if (sdevp) |
1177 | *sdevp = sdev; | |
1178 | else | |
1179 | scsi_device_put(sdev); | |
1180 | ||
1181 | if (bflagsp) | |
1182 | *bflagsp = scsi_get_device_flags(sdev, | |
1183 | sdev->vendor, | |
1184 | sdev->model); | |
1185 | return SCSI_SCAN_LUN_PRESENT; | |
1186 | } | |
6f3a2024 JB |
1187 | scsi_device_put(sdev); |
1188 | } else | |
1189 | sdev = scsi_alloc_sdev(starget, lun, hostdata); | |
1da177e4 LT |
1190 | if (!sdev) |
1191 | goto out; | |
39216033 | 1192 | |
aaff5eba | 1193 | result = kmalloc(result_len, GFP_KERNEL); |
1da177e4 | 1194 | if (!result) |
39216033 | 1195 | goto out_free_sdev; |
1da177e4 | 1196 | |
39216033 | 1197 | if (scsi_probe_lun(sdev, result, result_len, &bflags)) |
1da177e4 LT |
1198 | goto out_free_result; |
1199 | ||
4186ab19 KG |
1200 | if (bflagsp) |
1201 | *bflagsp = bflags; | |
1da177e4 LT |
1202 | /* |
1203 | * result contains valid SCSI INQUIRY data. | |
1204 | */ | |
496c91bb | 1205 | if ((result[0] >> 5) == 3) { |
1da177e4 LT |
1206 | /* |
1207 | * For a Peripheral qualifier 3 (011b), the SCSI | |
1208 | * spec says: The device server is not capable of | |
1209 | * supporting a physical device on this logical | |
1210 | * unit. | |
1211 | * | |
1212 | * For disks, this implies that there is no | |
1213 | * logical disk configured at sdev->lun, but there | |
1214 | * is a target id responding. | |
1215 | */ | |
6c7154c9 KG |
1216 | SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:" |
1217 | " peripheral qualifier of 3, device not" | |
1218 | " added\n")) | |
1219 | if (lun == 0) { | |
c5f2e640 | 1220 | SCSI_LOG_SCAN_BUS(1, { |
1221 | unsigned char vend[9]; | |
1222 | unsigned char mod[17]; | |
1223 | ||
1224 | sdev_printk(KERN_INFO, sdev, | |
6c7154c9 | 1225 | "scsi scan: consider passing scsi_mod." |
3424a65d | 1226 | "dev_flags=%s:%s:0x240 or 0x1000240\n", |
6c7154c9 | 1227 | scsi_inq_str(vend, result, 8, 16), |
c5f2e640 | 1228 | scsi_inq_str(mod, result, 16, 32)); |
1229 | }); | |
643eb2d9 | 1230 | |
6c7154c9 | 1231 | } |
643eb2d9 | 1232 | |
1da177e4 LT |
1233 | res = SCSI_SCAN_TARGET_PRESENT; |
1234 | goto out_free_result; | |
1235 | } | |
1236 | ||
1bfc5d9d | 1237 | /* |
84961f28 | 1238 | * Some targets may set slight variations of PQ and PDT to signal |
1239 | * that no LUN is present, so don't add sdev in these cases. | |
1240 | * Two specific examples are: | |
1241 | * 1) NetApp targets: return PQ=1, PDT=0x1f | |
15600159 | 1242 | * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved" |
84961f28 | 1243 | * in the UFI 1.0 spec (we cannot rely on reserved bits). |
1244 | * | |
1245 | * References: | |
1246 | * 1) SCSI SPC-3, pp. 145-146 | |
1247 | * PQ=1: "A peripheral device having the specified peripheral | |
1248 | * device type is not connected to this logical unit. However, the | |
1249 | * device server is capable of supporting the specified peripheral | |
1250 | * device type on this logical unit." | |
1251 | * PDT=0x1f: "Unknown or no device type" | |
1252 | * 2) USB UFI 1.0, p. 20 | |
1253 | * PDT=00h Direct-access device (floppy) | |
1254 | * PDT=1Fh none (no FDD connected to the requested logical unit) | |
1bfc5d9d | 1255 | */ |
15600159 MP |
1256 | if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) && |
1257 | (result[0] & 0x1f) == 0x1f && | |
01b291bd | 1258 | !scsi_is_wlun(lun)) { |
91921e01 | 1259 | SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
1bfc5d9d AS |
1260 | "scsi scan: peripheral device type" |
1261 | " of 31, no device added\n")); | |
1262 | res = SCSI_SCAN_TARGET_PRESENT; | |
1263 | goto out_free_result; | |
1264 | } | |
1265 | ||
3e082a91 | 1266 | res = scsi_add_lun(sdev, result, &bflags, shost->async_scan); |
1da177e4 LT |
1267 | if (res == SCSI_SCAN_LUN_PRESENT) { |
1268 | if (bflags & BLIST_KEY) { | |
1269 | sdev->lockable = 0; | |
39216033 | 1270 | scsi_unlock_floptical(sdev, result); |
1da177e4 | 1271 | } |
1da177e4 LT |
1272 | } |
1273 | ||
1274 | out_free_result: | |
1275 | kfree(result); | |
1da177e4 LT |
1276 | out_free_sdev: |
1277 | if (res == SCSI_SCAN_LUN_PRESENT) { | |
1278 | if (sdevp) { | |
b70d37bf AS |
1279 | if (scsi_device_get(sdev) == 0) { |
1280 | *sdevp = sdev; | |
1281 | } else { | |
1282 | __scsi_remove_device(sdev); | |
1283 | res = SCSI_SCAN_NO_RESPONSE; | |
1284 | } | |
1da177e4 | 1285 | } |
6f3a2024 | 1286 | } else |
860dc736 | 1287 | __scsi_remove_device(sdev); |
1da177e4 LT |
1288 | out: |
1289 | return res; | |
1290 | } | |
1291 | ||
1292 | /** | |
1293 | * scsi_sequential_lun_scan - sequentially scan a SCSI target | |
1294 | * @starget: pointer to target structure to scan | |
1295 | * @bflags: black/white list flag for LUN 0 | |
eb44820c RL |
1296 | * @scsi_level: Which version of the standard does this device adhere to |
1297 | * @rescan: passed to scsi_probe_add_lun() | |
1da177e4 LT |
1298 | * |
1299 | * Description: | |
1300 | * Generally, scan from LUN 1 (LUN 0 is assumed to already have been | |
1301 | * scanned) to some maximum lun until a LUN is found with no device | |
1302 | * attached. Use the bflags to figure out any oddities. | |
1303 | * | |
1304 | * Modifies sdevscan->lun. | |
1305 | **/ | |
1306 | static void scsi_sequential_lun_scan(struct scsi_target *starget, | |
093b8886 | 1307 | blist_flags_t bflags, int scsi_level, |
1d645088 | 1308 | enum scsi_scan_mode rescan) |
1da177e4 | 1309 | { |
9cb78c16 HR |
1310 | uint max_dev_lun; |
1311 | u64 sparse_lun, lun; | |
1da177e4 LT |
1312 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
1313 | ||
91921e01 HR |
1314 | SCSI_LOG_SCAN_BUS(3, starget_printk(KERN_INFO, starget, |
1315 | "scsi scan: Sequential scan\n")); | |
1da177e4 LT |
1316 | |
1317 | max_dev_lun = min(max_scsi_luns, shost->max_lun); | |
1318 | /* | |
1319 | * If this device is known to support sparse multiple units, | |
1320 | * override the other settings, and scan all of them. Normally, | |
1321 | * SCSI-3 devices should be scanned via the REPORT LUNS. | |
1322 | */ | |
1323 | if (bflags & BLIST_SPARSELUN) { | |
1324 | max_dev_lun = shost->max_lun; | |
1325 | sparse_lun = 1; | |
1326 | } else | |
1327 | sparse_lun = 0; | |
1328 | ||
1da177e4 | 1329 | /* |
fb0d82f4 | 1330 | * If less than SCSI_1_CCS, and no special lun scanning, stop |
1da177e4 | 1331 | * scanning; this matches 2.4 behaviour, but could just be a bug |
fb0d82f4 | 1332 | * (to continue scanning a SCSI_1_CCS device). |
1da177e4 LT |
1333 | * |
1334 | * This test is broken. We might not have any device on lun0 for | |
1335 | * a sparselun device, and if that's the case then how would we | |
1336 | * know the real scsi_level, eh? It might make sense to just not | |
1337 | * scan any SCSI_1 device for non-0 luns, but that check would best | |
1338 | * go into scsi_alloc_sdev() and just have it return null when asked | |
1339 | * to alloc an sdev for lun > 0 on an already found SCSI_1 device. | |
1340 | * | |
1341 | if ((sdevscan->scsi_level < SCSI_1_CCS) && | |
1342 | ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN)) | |
1343 | == 0)) | |
1344 | return; | |
1345 | */ | |
1346 | /* | |
1347 | * If this device is known to support multiple units, override | |
1348 | * the other settings, and scan all of them. | |
1349 | */ | |
1350 | if (bflags & BLIST_FORCELUN) | |
1351 | max_dev_lun = shost->max_lun; | |
1352 | /* | |
1353 | * REGAL CDC-4X: avoid hang after LUN 4 | |
1354 | */ | |
1355 | if (bflags & BLIST_MAX5LUN) | |
1356 | max_dev_lun = min(5U, max_dev_lun); | |
1357 | /* | |
1358 | * Do not scan SCSI-2 or lower device past LUN 7, unless | |
1359 | * BLIST_LARGELUN. | |
1360 | */ | |
1361 | if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN)) | |
1362 | max_dev_lun = min(8U, max_dev_lun); | |
496c91bb | 1363 | else |
22ffeb48 HR |
1364 | max_dev_lun = min(256U, max_dev_lun); |
1365 | ||
1da177e4 LT |
1366 | /* |
1367 | * We have already scanned LUN 0, so start at LUN 1. Keep scanning | |
1368 | * until we reach the max, or no LUN is found and we are not | |
1369 | * sparse_lun. | |
1370 | */ | |
1371 | for (lun = 1; lun < max_dev_lun; ++lun) | |
1372 | if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, | |
1373 | NULL) != SCSI_SCAN_LUN_PRESENT) && | |
1374 | !sparse_lun) | |
1375 | return; | |
1376 | } | |
1377 | ||
1da177e4 LT |
1378 | /** |
1379 | * scsi_report_lun_scan - Scan using SCSI REPORT LUN results | |
eb44820c RL |
1380 | * @starget: which target |
1381 | * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN | |
1382 | * @rescan: nonzero if we can skip code only needed on first scan | |
1da177e4 LT |
1383 | * |
1384 | * Description: | |
eb44820c RL |
1385 | * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command. |
1386 | * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun. | |
1da177e4 | 1387 | * |
eb44820c RL |
1388 | * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8 |
1389 | * LUNs even if it's older than SCSI-3. | |
1390 | * If BLIST_NOREPORTLUN is set, return 1 always. | |
1391 | * If BLIST_NOLUN is set, return 0 always. | |
09b6b51b | 1392 | * If starget->no_report_luns is set, return 1 always. |
1da177e4 LT |
1393 | * |
1394 | * Return: | |
1395 | * 0: scan completed (or no memory, so further scanning is futile) | |
eb44820c | 1396 | * 1: could not scan with REPORT LUN |
1da177e4 | 1397 | **/ |
093b8886 | 1398 | static int scsi_report_lun_scan(struct scsi_target *starget, blist_flags_t bflags, |
1d645088 | 1399 | enum scsi_scan_mode rescan) |
1da177e4 | 1400 | { |
1da177e4 LT |
1401 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
1402 | unsigned int length; | |
9cb78c16 | 1403 | u64 lun; |
1da177e4 LT |
1404 | unsigned int num_luns; |
1405 | unsigned int retries; | |
39216033 | 1406 | int result; |
1da177e4 | 1407 | struct scsi_lun *lunp, *lun_data; |
1da177e4 | 1408 | struct scsi_sense_hdr sshdr; |
6f3a2024 JB |
1409 | struct scsi_device *sdev; |
1410 | struct Scsi_Host *shost = dev_to_shost(&starget->dev); | |
7dfe0b5e MC |
1411 | const struct scsi_exec_args exec_args = { |
1412 | .sshdr = &sshdr, | |
1413 | }; | |
2ef89198 | 1414 | int ret = 0; |
1da177e4 LT |
1415 | |
1416 | /* | |
1417 | * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set. | |
1418 | * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does | |
1419 | * support more than 8 LUNs. | |
09b6b51b | 1420 | * Don't attempt if the target doesn't support REPORT LUNS. |
1da177e4 | 1421 | */ |
4d7db04a JB |
1422 | if (bflags & BLIST_NOREPORTLUN) |
1423 | return 1; | |
1424 | if (starget->scsi_level < SCSI_2 && | |
1425 | starget->scsi_level != SCSI_UNKNOWN) | |
1426 | return 1; | |
1427 | if (starget->scsi_level < SCSI_3 && | |
1428 | (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) | |
1da177e4 LT |
1429 | return 1; |
1430 | if (bflags & BLIST_NOLUN) | |
1431 | return 0; | |
09b6b51b AS |
1432 | if (starget->no_report_luns) |
1433 | return 1; | |
1da177e4 | 1434 | |
6f3a2024 JB |
1435 | if (!(sdev = scsi_device_lookup_by_target(starget, 0))) { |
1436 | sdev = scsi_alloc_sdev(starget, 0, NULL); | |
1437 | if (!sdev) | |
1438 | return 0; | |
75f8ee8e AS |
1439 | if (scsi_device_get(sdev)) { |
1440 | __scsi_remove_device(sdev); | |
6f3a2024 | 1441 | return 0; |
75f8ee8e | 1442 | } |
6f3a2024 JB |
1443 | } |
1444 | ||
1da177e4 LT |
1445 | /* |
1446 | * Allocate enough to hold the header (the same size as one scsi_lun) | |
acd6d738 RE |
1447 | * plus the number of luns we are requesting. 511 was the default |
1448 | * value of the now removed max_report_luns parameter. | |
1da177e4 | 1449 | */ |
acd6d738 RE |
1450 | length = (511 + 1) * sizeof(struct scsi_lun); |
1451 | retry: | |
aaff5eba | 1452 | lun_data = kmalloc(length, GFP_KERNEL); |
6f3a2024 | 1453 | if (!lun_data) { |
cadbd4a5 | 1454 | printk(ALLOC_FAILURE_MSG, __func__); |
39216033 | 1455 | goto out; |
6f3a2024 | 1456 | } |
1da177e4 LT |
1457 | |
1458 | scsi_cmd[0] = REPORT_LUNS; | |
1459 | ||
1460 | /* | |
1461 | * bytes 1 - 5: reserved, set to zero. | |
1462 | */ | |
1463 | memset(&scsi_cmd[1], 0, 5); | |
1464 | ||
1465 | /* | |
1466 | * bytes 6 - 9: length of the command. | |
1467 | */ | |
2a904e5d | 1468 | put_unaligned_be32(length, &scsi_cmd[6]); |
1da177e4 LT |
1469 | |
1470 | scsi_cmd[10] = 0; /* reserved */ | |
1471 | scsi_cmd[11] = 0; /* control */ | |
1da177e4 LT |
1472 | |
1473 | /* | |
1474 | * We can get a UNIT ATTENTION, for example a power on/reset, so | |
1475 | * retry a few times (like sd.c does for TEST UNIT READY). | |
1476 | * Experience shows some combinations of adapter/devices get at | |
1477 | * least two power on/resets. | |
1478 | * | |
1479 | * Illegal requests (for devices that do not support REPORT LUNS) | |
1480 | * should come through as a check condition, and will not generate | |
1481 | * a retry. | |
1482 | */ | |
1483 | for (retries = 0; retries < 3; retries++) { | |
91921e01 HR |
1484 | SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, |
1485 | "scsi scan: Sending REPORT LUNS to (try %d)\n", | |
1da177e4 | 1486 | retries)); |
39216033 | 1487 | |
7dfe0b5e MC |
1488 | result = scsi_execute_cmd(sdev, scsi_cmd, REQ_OP_DRV_IN, |
1489 | lun_data, length, | |
1490 | SCSI_REPORT_LUNS_TIMEOUT, 3, | |
1491 | &exec_args); | |
39216033 | 1492 | |
91921e01 HR |
1493 | SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, |
1494 | "scsi scan: REPORT LUNS" | |
1495 | " %s (try %d) result 0x%x\n", | |
1496 | result ? "failed" : "successful", | |
1497 | retries, result)); | |
39216033 | 1498 | if (result == 0) |
1da177e4 | 1499 | break; |
ea73a9f2 | 1500 | else if (scsi_sense_valid(&sshdr)) { |
1da177e4 LT |
1501 | if (sshdr.sense_key != UNIT_ATTENTION) |
1502 | break; | |
1503 | } | |
1504 | } | |
1505 | ||
39216033 | 1506 | if (result) { |
1da177e4 LT |
1507 | /* |
1508 | * The device probably does not support a REPORT LUN command | |
1509 | */ | |
2ef89198 AS |
1510 | ret = 1; |
1511 | goto out_err; | |
1da177e4 | 1512 | } |
1da177e4 LT |
1513 | |
1514 | /* | |
1515 | * Get the length from the first four bytes of lun_data. | |
1516 | */ | |
acd6d738 RE |
1517 | if (get_unaligned_be32(lun_data->scsi_lun) + |
1518 | sizeof(struct scsi_lun) > length) { | |
1519 | length = get_unaligned_be32(lun_data->scsi_lun) + | |
1520 | sizeof(struct scsi_lun); | |
1521 | kfree(lun_data); | |
1522 | goto retry; | |
1523 | } | |
2a904e5d | 1524 | length = get_unaligned_be32(lun_data->scsi_lun); |
1da177e4 LT |
1525 | |
1526 | num_luns = (length / sizeof(struct scsi_lun)); | |
1da177e4 | 1527 | |
3bf743e7 JG |
1528 | SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, |
1529 | "scsi scan: REPORT LUN scan\n")); | |
1da177e4 LT |
1530 | |
1531 | /* | |
1532 | * Scan the luns in lun_data. The entry at offset 0 is really | |
1533 | * the header, so start at 1 and go up to and including num_luns. | |
1534 | */ | |
1535 | for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) { | |
1536 | lun = scsilun_to_int(lunp); | |
1537 | ||
9cb78c16 | 1538 | if (lun > sdev->host->max_lun) { |
91921e01 HR |
1539 | sdev_printk(KERN_WARNING, sdev, |
1540 | "lun%llu has a LUN larger than" | |
1541 | " allowed by the host adapter\n", lun); | |
1da177e4 LT |
1542 | } else { |
1543 | int res; | |
1544 | ||
1545 | res = scsi_probe_and_add_lun(starget, | |
1546 | lun, NULL, NULL, rescan, NULL); | |
1547 | if (res == SCSI_SCAN_NO_RESPONSE) { | |
1548 | /* | |
1549 | * Got some results, but now none, abort. | |
1550 | */ | |
3bf743e7 JG |
1551 | sdev_printk(KERN_ERR, sdev, |
1552 | "Unexpected response" | |
9cb78c16 HR |
1553 | " from lun %llu while scanning, scan" |
1554 | " aborted\n", (unsigned long long)lun); | |
1da177e4 LT |
1555 | break; |
1556 | } | |
1557 | } | |
1558 | } | |
1559 | ||
2ef89198 | 1560 | out_err: |
1da177e4 | 1561 | kfree(lun_data); |
1da177e4 | 1562 | out: |
0f1d87a2 | 1563 | if (scsi_device_created(sdev)) |
6f3a2024 JB |
1564 | /* |
1565 | * the sdev we used didn't appear in the report luns scan | |
1566 | */ | |
860dc736 | 1567 | __scsi_remove_device(sdev); |
bcd8f2e9 | 1568 | scsi_device_put(sdev); |
2ef89198 | 1569 | return ret; |
1da177e4 LT |
1570 | } |
1571 | ||
1572 | struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel, | |
9cb78c16 | 1573 | uint id, u64 lun, void *hostdata) |
1da177e4 | 1574 | { |
a97a83a0 | 1575 | struct scsi_device *sdev = ERR_PTR(-ENODEV); |
1da177e4 | 1576 | struct device *parent = &shost->shost_gendev; |
e02f3f59 | 1577 | struct scsi_target *starget; |
1da177e4 | 1578 | |
938e2ac0 MW |
1579 | if (strncmp(scsi_scan_type, "none", 4) == 0) |
1580 | return ERR_PTR(-ENODEV); | |
1581 | ||
e02f3f59 | 1582 | starget = scsi_alloc_target(parent, channel, id); |
1da177e4 LT |
1583 | if (!starget) |
1584 | return ERR_PTR(-ENOMEM); | |
bc4f2401 | 1585 | scsi_autopm_get_target(starget); |
1da177e4 | 1586 | |
0b950672 | 1587 | mutex_lock(&shost->scan_mutex); |
6b7f123f MW |
1588 | if (!shost->async_scan) |
1589 | scsi_complete_async_scans(); | |
1590 | ||
bc4f2401 | 1591 | if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) { |
35bd6f9f JG |
1592 | scsi_probe_and_add_lun(starget, lun, NULL, &sdev, |
1593 | SCSI_SCAN_RESCAN, hostdata); | |
bc4f2401 AS |
1594 | scsi_autopm_put_host(shost); |
1595 | } | |
0b950672 | 1596 | mutex_unlock(&shost->scan_mutex); |
bc4f2401 | 1597 | scsi_autopm_put_target(starget); |
e63ed0d7 JB |
1598 | /* |
1599 | * paired with scsi_alloc_target(). Target will be destroyed unless | |
1600 | * scsi_probe_and_add_lun made an underlying device visible | |
1601 | */ | |
1da177e4 LT |
1602 | scsi_target_reap(starget); |
1603 | put_device(&starget->dev); | |
1604 | ||
1605 | return sdev; | |
1606 | } | |
1607 | EXPORT_SYMBOL(__scsi_add_device); | |
1608 | ||
146f7262 | 1609 | int scsi_add_device(struct Scsi_Host *host, uint channel, |
9cb78c16 | 1610 | uint target, u64 lun) |
146f7262 JB |
1611 | { |
1612 | struct scsi_device *sdev = | |
1613 | __scsi_add_device(host, channel, target, lun, NULL); | |
1614 | if (IS_ERR(sdev)) | |
1615 | return PTR_ERR(sdev); | |
1616 | ||
1617 | scsi_device_put(sdev); | |
1618 | return 0; | |
1619 | } | |
1620 | EXPORT_SYMBOL(scsi_add_device); | |
1621 | ||
1da177e4 LT |
1622 | void scsi_rescan_device(struct device *dev) |
1623 | { | |
d3d32891 HR |
1624 | struct scsi_device *sdev = to_scsi_device(dev); |
1625 | ||
e27829dc | 1626 | device_lock(dev); |
09e2b0b1 | 1627 | |
d3d32891 | 1628 | scsi_attach_vpd(sdev); |
62488520 | 1629 | scsi_cdl_check(sdev); |
d3d32891 HR |
1630 | |
1631 | if (sdev->handler && sdev->handler->rescan) | |
1632 | sdev->handler->rescan(sdev); | |
09e2b0b1 | 1633 | |
e27829dc | 1634 | if (dev->driver && try_module_get(dev->driver->owner)) { |
3af6b352 CH |
1635 | struct scsi_driver *drv = to_scsi_driver(dev->driver); |
1636 | ||
1da177e4 LT |
1637 | if (drv->rescan) |
1638 | drv->rescan(dev); | |
3af6b352 | 1639 | module_put(dev->driver->owner); |
1da177e4 | 1640 | } |
e27829dc | 1641 | device_unlock(dev); |
1da177e4 LT |
1642 | } |
1643 | EXPORT_SYMBOL(scsi_rescan_device); | |
1644 | ||
e517d313 | 1645 | static void __scsi_scan_target(struct device *parent, unsigned int channel, |
1d645088 | 1646 | unsigned int id, u64 lun, enum scsi_scan_mode rescan) |
1da177e4 LT |
1647 | { |
1648 | struct Scsi_Host *shost = dev_to_shost(parent); | |
093b8886 | 1649 | blist_flags_t bflags = 0; |
1da177e4 | 1650 | int res; |
1da177e4 LT |
1651 | struct scsi_target *starget; |
1652 | ||
1653 | if (shost->this_id == id) | |
1654 | /* | |
1655 | * Don't scan the host adapter | |
1656 | */ | |
1657 | return; | |
1658 | ||
1da177e4 | 1659 | starget = scsi_alloc_target(parent, channel, id); |
1da177e4 LT |
1660 | if (!starget) |
1661 | return; | |
bc4f2401 | 1662 | scsi_autopm_get_target(starget); |
1da177e4 | 1663 | |
1da177e4 LT |
1664 | if (lun != SCAN_WILD_CARD) { |
1665 | /* | |
1666 | * Scan for a specific host/chan/id/lun. | |
1667 | */ | |
1668 | scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL); | |
1669 | goto out_reap; | |
1670 | } | |
1671 | ||
1672 | /* | |
1673 | * Scan LUN 0, if there is some response, scan further. Ideally, we | |
1674 | * would not configure LUN 0 until all LUNs are scanned. | |
1675 | */ | |
6f3a2024 JB |
1676 | res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL); |
1677 | if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) { | |
1678 | if (scsi_report_lun_scan(starget, bflags, rescan) != 0) | |
1da177e4 LT |
1679 | /* |
1680 | * The REPORT LUN did not scan the target, | |
1681 | * do a sequential scan. | |
1682 | */ | |
1683 | scsi_sequential_lun_scan(starget, bflags, | |
4186ab19 | 1684 | starget->scsi_level, rescan); |
1da177e4 | 1685 | } |
1da177e4 LT |
1686 | |
1687 | out_reap: | |
bc4f2401 | 1688 | scsi_autopm_put_target(starget); |
e63ed0d7 JB |
1689 | /* |
1690 | * paired with scsi_alloc_target(): determine if the target has | |
1691 | * any children at all and if not, nuke it | |
1692 | */ | |
1da177e4 LT |
1693 | scsi_target_reap(starget); |
1694 | ||
1695 | put_device(&starget->dev); | |
1696 | } | |
e517d313 AS |
1697 | |
1698 | /** | |
e59e4a09 | 1699 | * scsi_scan_target - scan a target id, possibly including all LUNs on the target. |
e517d313 AS |
1700 | * @parent: host to scan |
1701 | * @channel: channel to scan | |
1702 | * @id: target id to scan | |
1703 | * @lun: Specific LUN to scan or SCAN_WILD_CARD | |
1d645088 HR |
1704 | * @rescan: passed to LUN scanning routines; SCSI_SCAN_INITIAL for |
1705 | * no rescan, SCSI_SCAN_RESCAN to rescan existing LUNs, | |
1706 | * and SCSI_SCAN_MANUAL to force scanning even if | |
1707 | * 'scan=manual' is set. | |
e517d313 AS |
1708 | * |
1709 | * Description: | |
1710 | * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0, | |
1711 | * and possibly all LUNs on the target id. | |
1712 | * | |
1713 | * First try a REPORT LUN scan, if that does not scan the target, do a | |
1714 | * sequential scan of LUNs on the target id. | |
1715 | **/ | |
1716 | void scsi_scan_target(struct device *parent, unsigned int channel, | |
1d645088 | 1717 | unsigned int id, u64 lun, enum scsi_scan_mode rescan) |
e517d313 AS |
1718 | { |
1719 | struct Scsi_Host *shost = dev_to_shost(parent); | |
1720 | ||
93b45af5 MW |
1721 | if (strncmp(scsi_scan_type, "none", 4) == 0) |
1722 | return; | |
1723 | ||
1d645088 HR |
1724 | if (rescan != SCSI_SCAN_MANUAL && |
1725 | strncmp(scsi_scan_type, "manual", 6) == 0) | |
1726 | return; | |
1727 | ||
6b7f123f | 1728 | mutex_lock(&shost->scan_mutex); |
3e082a91 MW |
1729 | if (!shost->async_scan) |
1730 | scsi_complete_async_scans(); | |
1731 | ||
bc4f2401 | 1732 | if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) { |
e517d313 | 1733 | __scsi_scan_target(parent, channel, id, lun, rescan); |
bc4f2401 AS |
1734 | scsi_autopm_put_host(shost); |
1735 | } | |
0b950672 | 1736 | mutex_unlock(&shost->scan_mutex); |
e517d313 | 1737 | } |
1da177e4 LT |
1738 | EXPORT_SYMBOL(scsi_scan_target); |
1739 | ||
1740 | static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel, | |
1d645088 HR |
1741 | unsigned int id, u64 lun, |
1742 | enum scsi_scan_mode rescan) | |
1da177e4 LT |
1743 | { |
1744 | uint order_id; | |
1745 | ||
1746 | if (id == SCAN_WILD_CARD) | |
1747 | for (id = 0; id < shost->max_id; ++id) { | |
1748 | /* | |
1749 | * XXX adapter drivers when possible (FCP, iSCSI) | |
1750 | * could modify max_id to match the current max, | |
1751 | * not the absolute max. | |
1752 | * | |
1753 | * XXX add a shost id iterator, so for example, | |
1754 | * the FC ID can be the same as a target id | |
1755 | * without a huge overhead of sparse id's. | |
1756 | */ | |
1757 | if (shost->reverse_ordering) | |
1758 | /* | |
1759 | * Scan from high to low id. | |
1760 | */ | |
1761 | order_id = shost->max_id - id - 1; | |
1762 | else | |
1763 | order_id = id; | |
e517d313 AS |
1764 | __scsi_scan_target(&shost->shost_gendev, channel, |
1765 | order_id, lun, rescan); | |
1da177e4 LT |
1766 | } |
1767 | else | |
e517d313 AS |
1768 | __scsi_scan_target(&shost->shost_gendev, channel, |
1769 | id, lun, rescan); | |
1da177e4 LT |
1770 | } |
1771 | ||
1772 | int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel, | |
1d645088 HR |
1773 | unsigned int id, u64 lun, |
1774 | enum scsi_scan_mode rescan) | |
1da177e4 | 1775 | { |
3bf743e7 | 1776 | SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost, |
9cb78c16 | 1777 | "%s: <%u:%u:%llu>\n", |
cadbd4a5 | 1778 | __func__, channel, id, lun)); |
1da177e4 LT |
1779 | |
1780 | if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) || | |
091686d3 | 1781 | ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) || |
605c6dbe | 1782 | ((lun != SCAN_WILD_CARD) && (lun >= shost->max_lun))) |
1da177e4 LT |
1783 | return -EINVAL; |
1784 | ||
0b950672 | 1785 | mutex_lock(&shost->scan_mutex); |
6b7f123f MW |
1786 | if (!shost->async_scan) |
1787 | scsi_complete_async_scans(); | |
1788 | ||
bc4f2401 | 1789 | if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) { |
82f29467 MA |
1790 | if (channel == SCAN_WILD_CARD) |
1791 | for (channel = 0; channel <= shost->max_channel; | |
1792 | channel++) | |
1793 | scsi_scan_channel(shost, channel, id, lun, | |
1794 | rescan); | |
1795 | else | |
1da177e4 | 1796 | scsi_scan_channel(shost, channel, id, lun, rescan); |
bc4f2401 | 1797 | scsi_autopm_put_host(shost); |
82f29467 | 1798 | } |
0b950672 | 1799 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
1800 | |
1801 | return 0; | |
1802 | } | |
1803 | ||
3e082a91 MW |
1804 | static void scsi_sysfs_add_devices(struct Scsi_Host *shost) |
1805 | { | |
1806 | struct scsi_device *sdev; | |
1807 | shost_for_each_device(sdev, shost) { | |
3b661a92 DW |
1808 | /* target removed before the device could be added */ |
1809 | if (sdev->sdev_state == SDEV_DEL) | |
1810 | continue; | |
693ad5ba SJ |
1811 | /* If device is already visible, skip adding it to sysfs */ |
1812 | if (sdev->is_visible) | |
1813 | continue; | |
6b7f123f MW |
1814 | if (!scsi_host_scan_allowed(shost) || |
1815 | scsi_sysfs_add_sdev(sdev) != 0) | |
860dc736 | 1816 | __scsi_remove_device(sdev); |
3e082a91 MW |
1817 | } |
1818 | } | |
1819 | ||
1820 | /** | |
1821 | * scsi_prep_async_scan - prepare for an async scan | |
1822 | * @shost: the host which will be scanned | |
1823 | * Returns: a cookie to be passed to scsi_finish_async_scan() | |
1824 | * | |
1825 | * Tells the midlayer this host is going to do an asynchronous scan. | |
1826 | * It reserves the host's position in the scanning list and ensures | |
1827 | * that other asynchronous scans started after this one won't affect the | |
1828 | * ordering of the discovered devices. | |
1829 | */ | |
1aa8fab2 | 1830 | static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost) |
3e082a91 | 1831 | { |
831e3405 | 1832 | struct async_scan_data *data = NULL; |
6b7f123f | 1833 | unsigned long flags; |
3e082a91 MW |
1834 | |
1835 | if (strncmp(scsi_scan_type, "sync", 4) == 0) | |
1836 | return NULL; | |
1837 | ||
831e3405 | 1838 | mutex_lock(&shost->scan_mutex); |
3e082a91 | 1839 | if (shost->async_scan) { |
a4cf30e1 | 1840 | shost_printk(KERN_DEBUG, shost, "%s called twice\n", __func__); |
831e3405 | 1841 | goto err; |
3e082a91 MW |
1842 | } |
1843 | ||
1844 | data = kmalloc(sizeof(*data), GFP_KERNEL); | |
1845 | if (!data) | |
1846 | goto err; | |
1847 | data->shost = scsi_host_get(shost); | |
1848 | if (!data->shost) | |
1849 | goto err; | |
1850 | init_completion(&data->prev_finished); | |
1851 | ||
6b7f123f | 1852 | spin_lock_irqsave(shost->host_lock, flags); |
3e082a91 | 1853 | shost->async_scan = 1; |
6b7f123f MW |
1854 | spin_unlock_irqrestore(shost->host_lock, flags); |
1855 | mutex_unlock(&shost->scan_mutex); | |
1856 | ||
1857 | spin_lock(&async_scan_lock); | |
3e082a91 MW |
1858 | if (list_empty(&scanning_hosts)) |
1859 | complete(&data->prev_finished); | |
1860 | list_add_tail(&data->list, &scanning_hosts); | |
1861 | spin_unlock(&async_scan_lock); | |
1862 | ||
1863 | return data; | |
1864 | ||
1865 | err: | |
831e3405 | 1866 | mutex_unlock(&shost->scan_mutex); |
3e082a91 MW |
1867 | kfree(data); |
1868 | return NULL; | |
1869 | } | |
1870 | ||
1871 | /** | |
1872 | * scsi_finish_async_scan - asynchronous scan has finished | |
1873 | * @data: cookie returned from earlier call to scsi_prep_async_scan() | |
1874 | * | |
1875 | * All the devices currently attached to this host have been found. | |
1876 | * This function announces all the devices it has found to the rest | |
1877 | * of the system. | |
1878 | */ | |
1aa8fab2 | 1879 | static void scsi_finish_async_scan(struct async_scan_data *data) |
3e082a91 MW |
1880 | { |
1881 | struct Scsi_Host *shost; | |
6b7f123f | 1882 | unsigned long flags; |
3e082a91 MW |
1883 | |
1884 | if (!data) | |
1885 | return; | |
1886 | ||
1887 | shost = data->shost; | |
6b7f123f MW |
1888 | |
1889 | mutex_lock(&shost->scan_mutex); | |
1890 | ||
3e082a91 | 1891 | if (!shost->async_scan) { |
91921e01 | 1892 | shost_printk(KERN_INFO, shost, "%s called twice\n", __func__); |
3e082a91 | 1893 | dump_stack(); |
773e82f6 | 1894 | mutex_unlock(&shost->scan_mutex); |
3e082a91 MW |
1895 | return; |
1896 | } | |
1897 | ||
1898 | wait_for_completion(&data->prev_finished); | |
1899 | ||
1900 | scsi_sysfs_add_devices(shost); | |
1901 | ||
6b7f123f | 1902 | spin_lock_irqsave(shost->host_lock, flags); |
3e082a91 | 1903 | shost->async_scan = 0; |
6b7f123f MW |
1904 | spin_unlock_irqrestore(shost->host_lock, flags); |
1905 | ||
1906 | mutex_unlock(&shost->scan_mutex); | |
1907 | ||
1908 | spin_lock(&async_scan_lock); | |
3e082a91 MW |
1909 | list_del(&data->list); |
1910 | if (!list_empty(&scanning_hosts)) { | |
1911 | struct async_scan_data *next = list_entry(scanning_hosts.next, | |
1912 | struct async_scan_data, list); | |
1913 | complete(&next->prev_finished); | |
1914 | } | |
1915 | spin_unlock(&async_scan_lock); | |
1916 | ||
267a6ad4 | 1917 | scsi_autopm_put_host(shost); |
3e082a91 MW |
1918 | scsi_host_put(shost); |
1919 | kfree(data); | |
1920 | } | |
1921 | ||
1aa8fab2 | 1922 | static void do_scsi_scan_host(struct Scsi_Host *shost) |
3e082a91 | 1923 | { |
1aa8fab2 MW |
1924 | if (shost->hostt->scan_finished) { |
1925 | unsigned long start = jiffies; | |
1926 | if (shost->hostt->scan_start) | |
1927 | shost->hostt->scan_start(shost); | |
1928 | ||
1929 | while (!shost->hostt->scan_finished(shost, jiffies - start)) | |
1930 | msleep(10); | |
1931 | } else { | |
1932 | scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD, | |
425b27a0 | 1933 | SCAN_WILD_CARD, SCSI_SCAN_INITIAL); |
1aa8fab2 MW |
1934 | } |
1935 | } | |
3e082a91 | 1936 | |
6cdd5520 | 1937 | static void do_scan_async(void *_data, async_cookie_t c) |
1aa8fab2 MW |
1938 | { |
1939 | struct async_scan_data *data = _data; | |
bc4f2401 AS |
1940 | struct Scsi_Host *shost = data->shost; |
1941 | ||
1942 | do_scsi_scan_host(shost); | |
3e082a91 | 1943 | scsi_finish_async_scan(data); |
3e082a91 MW |
1944 | } |
1945 | ||
1da177e4 LT |
1946 | /** |
1947 | * scsi_scan_host - scan the given adapter | |
1948 | * @shost: adapter to scan | |
1949 | **/ | |
1950 | void scsi_scan_host(struct Scsi_Host *shost) | |
1951 | { | |
3e082a91 MW |
1952 | struct async_scan_data *data; |
1953 | ||
1d645088 HR |
1954 | if (strncmp(scsi_scan_type, "none", 4) == 0 || |
1955 | strncmp(scsi_scan_type, "manual", 6) == 0) | |
3e082a91 | 1956 | return; |
bc4f2401 AS |
1957 | if (scsi_autopm_get_host(shost) < 0) |
1958 | return; | |
3e082a91 MW |
1959 | |
1960 | data = scsi_prep_async_scan(shost); | |
1961 | if (!data) { | |
1aa8fab2 | 1962 | do_scsi_scan_host(shost); |
bc4f2401 | 1963 | scsi_autopm_put_host(shost); |
3e082a91 MW |
1964 | return; |
1965 | } | |
1aa8fab2 | 1966 | |
6cdd5520 DW |
1967 | /* register with the async subsystem so wait_for_device_probe() |
1968 | * will flush this work | |
1969 | */ | |
1970 | async_schedule(do_scan_async, data); | |
1971 | ||
267a6ad4 | 1972 | /* scsi_autopm_put_host(shost) is called in scsi_finish_async_scan() */ |
1da177e4 LT |
1973 | } |
1974 | EXPORT_SYMBOL(scsi_scan_host); | |
1975 | ||
1da177e4 LT |
1976 | void scsi_forget_host(struct Scsi_Host *shost) |
1977 | { | |
a64358db | 1978 | struct scsi_device *sdev; |
1da177e4 LT |
1979 | unsigned long flags; |
1980 | ||
a64358db | 1981 | restart: |
1da177e4 | 1982 | spin_lock_irqsave(shost->host_lock, flags); |
a64358db AS |
1983 | list_for_each_entry(sdev, &shost->__devices, siblings) { |
1984 | if (sdev->sdev_state == SDEV_DEL) | |
1985 | continue; | |
1da177e4 | 1986 | spin_unlock_irqrestore(shost->host_lock, flags); |
a64358db AS |
1987 | __scsi_remove_device(sdev); |
1988 | goto restart; | |
1da177e4 LT |
1989 | } |
1990 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1991 | } | |
1992 |