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1da177e4 LT |
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 | |
f64a181d | 12 | * device attached, a scsi_device is allocated and setup for it. |
1da177e4 LT |
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 | |
f64a181d | 20 | * scsi_device for it. |
1da177e4 LT |
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 | ||
1da177e4 LT |
28 | #include <linux/module.h> |
29 | #include <linux/moduleparam.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/blkdev.h> | |
3e082a91 MW |
32 | #include <linux/delay.h> |
33 | #include <linux/kthread.h> | |
34 | #include <linux/spinlock.h> | |
4ace92fc | 35 | #include <linux/async.h> |
5a0e3ad6 | 36 | #include <linux/slab.h> |
2a904e5d | 37 | #include <asm/unaligned.h> |
1da177e4 LT |
38 | |
39 | #include <scsi/scsi.h> | |
beb40487 | 40 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
41 | #include <scsi/scsi_device.h> |
42 | #include <scsi/scsi_driver.h> | |
43 | #include <scsi/scsi_devinfo.h> | |
44 | #include <scsi/scsi_host.h> | |
1da177e4 | 45 | #include <scsi/scsi_transport.h> |
d3d32891 | 46 | #include <scsi/scsi_dh.h> |
1da177e4 LT |
47 | #include <scsi/scsi_eh.h> |
48 | ||
49 | #include "scsi_priv.h" | |
50 | #include "scsi_logging.h" | |
51 | ||
52 | #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \ | |
53 | " SCSI scanning, some SCSI devices might not be configured\n" | |
54 | ||
55 | /* | |
56 | * Default timeout | |
57 | */ | |
58 | #define SCSI_TIMEOUT (2*HZ) | |
b39c9a66 | 59 | #define SCSI_REPORT_LUNS_TIMEOUT (30*HZ) |
1da177e4 LT |
60 | |
61 | /* | |
405ae7d3 | 62 | * Prefix values for the SCSI id's (stored in sysfs name field) |
1da177e4 LT |
63 | */ |
64 | #define SCSI_UID_SER_NUM 'S' | |
65 | #define SCSI_UID_UNKNOWN 'Z' | |
66 | ||
67 | /* | |
68 | * Return values of some of the scanning functions. | |
69 | * | |
70 | * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this | |
71 | * includes allocation or general failures preventing IO from being sent. | |
72 | * | |
73 | * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available | |
74 | * on the given LUN. | |
75 | * | |
76 | * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a | |
77 | * given LUN. | |
78 | */ | |
79 | #define SCSI_SCAN_NO_RESPONSE 0 | |
80 | #define SCSI_SCAN_TARGET_PRESENT 1 | |
81 | #define SCSI_SCAN_LUN_PRESENT 2 | |
82 | ||
0ad78200 | 83 | static const char *scsi_null_device_strs = "nullnullnullnull"; |
1da177e4 LT |
84 | |
85 | #define MAX_SCSI_LUNS 512 | |
86 | ||
1abf635d | 87 | static u64 max_scsi_luns = MAX_SCSI_LUNS; |
1da177e4 | 88 | |
1abf635d | 89 | module_param_named(max_luns, max_scsi_luns, ullong, S_IRUGO|S_IWUSR); |
1da177e4 | 90 | MODULE_PARM_DESC(max_luns, |
1abf635d | 91 | "last scsi LUN (should be between 1 and 2^64-1)"); |
1da177e4 | 92 | |
21db1882 MW |
93 | #ifdef CONFIG_SCSI_SCAN_ASYNC |
94 | #define SCSI_SCAN_TYPE_DEFAULT "async" | |
95 | #else | |
96 | #define SCSI_SCAN_TYPE_DEFAULT "sync" | |
97 | #endif | |
98 | ||
1d645088 | 99 | char scsi_scan_type[7] = SCSI_SCAN_TYPE_DEFAULT; |
3e082a91 | 100 | |
1d645088 HR |
101 | module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), |
102 | S_IRUGO|S_IWUSR); | |
103 | MODULE_PARM_DESC(scan, "sync, async, manual, or none. " | |
104 | "Setting to 'manual' disables automatic scanning, but allows " | |
105 | "for manual device scan via the 'scan' sysfs attribute."); | |
3e082a91 | 106 | |
14faf12f | 107 | static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ + 18; |
1da177e4 | 108 | |
10f4b89a | 109 | module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR); |
1da177e4 LT |
110 | MODULE_PARM_DESC(inq_timeout, |
111 | "Timeout (in seconds) waiting for devices to answer INQUIRY." | |
14faf12f | 112 | " Default is 20. Some devices may need more; most need less."); |
1da177e4 | 113 | |
6b7f123f | 114 | /* This lock protects only this list */ |
3e082a91 MW |
115 | static DEFINE_SPINLOCK(async_scan_lock); |
116 | static LIST_HEAD(scanning_hosts); | |
117 | ||
118 | struct async_scan_data { | |
119 | struct list_head list; | |
120 | struct Scsi_Host *shost; | |
121 | struct completion prev_finished; | |
122 | }; | |
123 | ||
124 | /** | |
125 | * scsi_complete_async_scans - Wait for asynchronous scans to complete | |
126 | * | |
8bcc2412 MW |
127 | * When this function returns, any host which started scanning before |
128 | * this function was called will have finished its scan. Hosts which | |
129 | * started scanning after this function was called may or may not have | |
130 | * finished. | |
3e082a91 MW |
131 | */ |
132 | int scsi_complete_async_scans(void) | |
133 | { | |
134 | struct async_scan_data *data; | |
135 | ||
136 | do { | |
137 | if (list_empty(&scanning_hosts)) | |
e96eb23d | 138 | return 0; |
3e082a91 MW |
139 | /* If we can't get memory immediately, that's OK. Just |
140 | * sleep a little. Even if we never get memory, the async | |
141 | * scans will finish eventually. | |
142 | */ | |
143 | data = kmalloc(sizeof(*data), GFP_KERNEL); | |
144 | if (!data) | |
145 | msleep(1); | |
146 | } while (!data); | |
147 | ||
148 | data->shost = NULL; | |
149 | init_completion(&data->prev_finished); | |
150 | ||
151 | spin_lock(&async_scan_lock); | |
152 | /* Check that there's still somebody else on the list */ | |
153 | if (list_empty(&scanning_hosts)) | |
154 | goto done; | |
155 | list_add_tail(&data->list, &scanning_hosts); | |
156 | spin_unlock(&async_scan_lock); | |
157 | ||
158 | printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n"); | |
159 | wait_for_completion(&data->prev_finished); | |
160 | ||
161 | spin_lock(&async_scan_lock); | |
162 | list_del(&data->list); | |
8bcc2412 MW |
163 | if (!list_empty(&scanning_hosts)) { |
164 | struct async_scan_data *next = list_entry(scanning_hosts.next, | |
165 | struct async_scan_data, list); | |
166 | complete(&next->prev_finished); | |
167 | } | |
3e082a91 MW |
168 | done: |
169 | spin_unlock(&async_scan_lock); | |
43a8d39d | 170 | |
e96eb23d | 171 | kfree(data); |
3e082a91 MW |
172 | return 0; |
173 | } | |
174 | ||
1da177e4 LT |
175 | /** |
176 | * scsi_unlock_floptical - unlock device via a special MODE SENSE command | |
39216033 | 177 | * @sdev: scsi device to send command to |
1da177e4 LT |
178 | * @result: area to store the result of the MODE SENSE |
179 | * | |
180 | * Description: | |
39216033 | 181 | * Send a vendor specific MODE SENSE (not a MODE SELECT) command. |
1da177e4 LT |
182 | * Called for BLIST_KEY devices. |
183 | **/ | |
39216033 | 184 | static void scsi_unlock_floptical(struct scsi_device *sdev, |
1da177e4 LT |
185 | unsigned char *result) |
186 | { | |
187 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
188 | ||
91921e01 | 189 | sdev_printk(KERN_NOTICE, sdev, "unlocking floptical drive\n"); |
1da177e4 LT |
190 | scsi_cmd[0] = MODE_SENSE; |
191 | scsi_cmd[1] = 0; | |
192 | scsi_cmd[2] = 0x2e; | |
193 | scsi_cmd[3] = 0; | |
39216033 | 194 | scsi_cmd[4] = 0x2a; /* size */ |
1da177e4 | 195 | scsi_cmd[5] = 0; |
39216033 | 196 | scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL, |
f4f4e47e | 197 | SCSI_TIMEOUT, 3, NULL); |
1da177e4 LT |
198 | } |
199 | ||
1da177e4 LT |
200 | /** |
201 | * scsi_alloc_sdev - allocate and setup a scsi_Device | |
eb44820c RL |
202 | * @starget: which target to allocate a &scsi_device for |
203 | * @lun: which lun | |
204 | * @hostdata: usually NULL and set by ->slave_alloc instead | |
1da177e4 LT |
205 | * |
206 | * Description: | |
207 | * Allocate, initialize for io, and return a pointer to a scsi_Device. | |
208 | * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and | |
209 | * adds scsi_Device to the appropriate list. | |
210 | * | |
211 | * Return value: | |
212 | * scsi_Device pointer, or NULL on failure. | |
213 | **/ | |
214 | static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, | |
9cb78c16 | 215 | u64 lun, void *hostdata) |
1da177e4 LT |
216 | { |
217 | struct scsi_device *sdev; | |
218 | int display_failure_msg = 1, ret; | |
219 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
220 | ||
24669f75 | 221 | sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size, |
1da177e4 LT |
222 | GFP_ATOMIC); |
223 | if (!sdev) | |
224 | goto out; | |
225 | ||
1da177e4 LT |
226 | sdev->vendor = scsi_null_device_strs; |
227 | sdev->model = scsi_null_device_strs; | |
228 | sdev->rev = scsi_null_device_strs; | |
229 | sdev->host = shost; | |
4a84067d | 230 | sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD; |
1da177e4 LT |
231 | sdev->id = starget->id; |
232 | sdev->lun = lun; | |
233 | sdev->channel = starget->channel; | |
0db6ca8a | 234 | mutex_init(&sdev->state_mutex); |
1da177e4 LT |
235 | sdev->sdev_state = SDEV_CREATED; |
236 | INIT_LIST_HEAD(&sdev->siblings); | |
237 | INIT_LIST_HEAD(&sdev->same_target_siblings); | |
238 | INIT_LIST_HEAD(&sdev->cmd_list); | |
239 | INIT_LIST_HEAD(&sdev->starved_entry); | |
a341cd0f | 240 | INIT_LIST_HEAD(&sdev->event_list); |
1da177e4 | 241 | spin_lock_init(&sdev->list_lock); |
09e2b0b1 | 242 | mutex_init(&sdev->inquiry_mutex); |
a341cd0f | 243 | INIT_WORK(&sdev->event_work, scsi_evt_thread); |
9937a5e2 | 244 | INIT_WORK(&sdev->requeue_work, scsi_requeue_run_queue); |
1da177e4 LT |
245 | |
246 | sdev->sdev_gendev.parent = get_device(&starget->dev); | |
247 | sdev->sdev_target = starget; | |
248 | ||
249 | /* usually NULL and set by ->slave_alloc instead */ | |
250 | sdev->hostdata = hostdata; | |
251 | ||
252 | /* if the device needs this changing, it may do so in the | |
253 | * slave_configure function */ | |
254 | sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED; | |
255 | ||
256 | /* | |
257 | * Some low level driver could use device->type | |
258 | */ | |
259 | sdev->type = -1; | |
260 | ||
261 | /* | |
262 | * Assume that the device will have handshaking problems, | |
263 | * and then fix this field later if it turns out it | |
264 | * doesn't | |
265 | */ | |
266 | sdev->borken = 1; | |
267 | ||
d285203c CH |
268 | if (shost_use_blk_mq(shost)) |
269 | sdev->request_queue = scsi_mq_alloc_queue(sdev); | |
270 | else | |
271 | sdev->request_queue = scsi_alloc_queue(sdev); | |
1da177e4 LT |
272 | if (!sdev->request_queue) { |
273 | /* release fn is set up in scsi_sysfs_device_initialise, so | |
274 | * have to free and put manually here */ | |
275 | put_device(&starget->dev); | |
93f56089 | 276 | kfree(sdev); |
1da177e4 LT |
277 | goto out; |
278 | } | |
09ac46c4 | 279 | WARN_ON_ONCE(!blk_get_queue(sdev->request_queue)); |
1da177e4 | 280 | sdev->request_queue->queuedata = sdev; |
2ecb204d | 281 | |
64d513ac | 282 | if (!shost_use_blk_mq(sdev->host)) { |
2ecb204d | 283 | blk_queue_init_tags(sdev->request_queue, |
ee1b6f7a SL |
284 | sdev->host->cmd_per_lun, shost->bqt, |
285 | shost->hostt->tag_alloc_policy); | |
2ecb204d | 286 | } |
ef10b169 JB |
287 | scsi_change_queue_depth(sdev, sdev->host->cmd_per_lun ? |
288 | sdev->host->cmd_per_lun : 1); | |
1da177e4 LT |
289 | |
290 | scsi_sysfs_device_initialize(sdev); | |
291 | ||
292 | if (shost->hostt->slave_alloc) { | |
293 | ret = shost->hostt->slave_alloc(sdev); | |
294 | if (ret) { | |
295 | /* | |
296 | * if LLDD reports slave not present, don't clutter | |
297 | * console with alloc failure messages | |
1da177e4 LT |
298 | */ |
299 | if (ret == -ENXIO) | |
300 | display_failure_msg = 0; | |
301 | goto out_device_destroy; | |
302 | } | |
303 | } | |
304 | ||
305 | return sdev; | |
306 | ||
307 | out_device_destroy: | |
4e6c82b3 | 308 | __scsi_remove_device(sdev); |
1da177e4 LT |
309 | out: |
310 | if (display_failure_msg) | |
cadbd4a5 | 311 | printk(ALLOC_FAILURE_MSG, __func__); |
1da177e4 LT |
312 | return NULL; |
313 | } | |
314 | ||
643eb2d9 JB |
315 | static void scsi_target_destroy(struct scsi_target *starget) |
316 | { | |
317 | struct device *dev = &starget->dev; | |
318 | struct Scsi_Host *shost = dev_to_shost(dev->parent); | |
319 | unsigned long flags; | |
320 | ||
f05795d3 | 321 | BUG_ON(starget->state == STARGET_DEL); |
f2495e22 | 322 | starget->state = STARGET_DEL; |
643eb2d9 JB |
323 | transport_destroy_device(dev); |
324 | spin_lock_irqsave(shost->host_lock, flags); | |
325 | if (shost->hostt->target_destroy) | |
326 | shost->hostt->target_destroy(starget); | |
327 | list_del_init(&starget->siblings); | |
328 | spin_unlock_irqrestore(shost->host_lock, flags); | |
329 | put_device(dev); | |
330 | } | |
331 | ||
1da177e4 LT |
332 | static void scsi_target_dev_release(struct device *dev) |
333 | { | |
334 | struct device *parent = dev->parent; | |
335 | struct scsi_target *starget = to_scsi_target(dev); | |
a283bd37 | 336 | |
1da177e4 LT |
337 | kfree(starget); |
338 | put_device(parent); | |
339 | } | |
340 | ||
453cd0f3 | 341 | static struct device_type scsi_target_type = { |
b0ed4336 HR |
342 | .name = "scsi_target", |
343 | .release = scsi_target_dev_release, | |
344 | }; | |
345 | ||
1da177e4 LT |
346 | int scsi_is_target_device(const struct device *dev) |
347 | { | |
b0ed4336 | 348 | return dev->type == &scsi_target_type; |
1da177e4 LT |
349 | } |
350 | EXPORT_SYMBOL(scsi_is_target_device); | |
351 | ||
352 | static struct scsi_target *__scsi_find_target(struct device *parent, | |
353 | int channel, uint id) | |
354 | { | |
355 | struct scsi_target *starget, *found_starget = NULL; | |
356 | struct Scsi_Host *shost = dev_to_shost(parent); | |
357 | /* | |
358 | * Search for an existing target for this sdev. | |
359 | */ | |
360 | list_for_each_entry(starget, &shost->__targets, siblings) { | |
361 | if (starget->id == id && | |
362 | starget->channel == channel) { | |
363 | found_starget = starget; | |
364 | break; | |
365 | } | |
366 | } | |
367 | if (found_starget) | |
368 | get_device(&found_starget->dev); | |
369 | ||
370 | return found_starget; | |
371 | } | |
372 | ||
e63ed0d7 JB |
373 | /** |
374 | * scsi_target_reap_ref_release - remove target from visibility | |
375 | * @kref: the reap_ref in the target being released | |
376 | * | |
377 | * Called on last put of reap_ref, which is the indication that no device | |
378 | * under this target is visible anymore, so render the target invisible in | |
379 | * sysfs. Note: we have to be in user context here because the target reaps | |
380 | * should be done in places where the scsi device visibility is being removed. | |
381 | */ | |
382 | static void scsi_target_reap_ref_release(struct kref *kref) | |
383 | { | |
384 | struct scsi_target *starget | |
385 | = container_of(kref, struct scsi_target, reap_ref); | |
386 | ||
f2495e22 JB |
387 | /* |
388 | * if we get here and the target is still in the CREATED state that | |
389 | * means it was allocated but never made visible (because a scan | |
390 | * turned up no LUNs), so don't call device_del() on it. | |
391 | */ | |
392 | if (starget->state != STARGET_CREATED) { | |
393 | transport_remove_device(&starget->dev); | |
394 | device_del(&starget->dev); | |
395 | } | |
e63ed0d7 JB |
396 | scsi_target_destroy(starget); |
397 | } | |
398 | ||
399 | static void scsi_target_reap_ref_put(struct scsi_target *starget) | |
400 | { | |
401 | kref_put(&starget->reap_ref, scsi_target_reap_ref_release); | |
402 | } | |
403 | ||
884d25cc JB |
404 | /** |
405 | * scsi_alloc_target - allocate a new or find an existing target | |
406 | * @parent: parent of the target (need not be a scsi host) | |
407 | * @channel: target channel number (zero if no channels) | |
408 | * @id: target id number | |
409 | * | |
410 | * Return an existing target if one exists, provided it hasn't already | |
411 | * gone into STARGET_DEL state, otherwise allocate a new target. | |
412 | * | |
413 | * The target is returned with an incremented reference, so the caller | |
414 | * is responsible for both reaping and doing a last put | |
415 | */ | |
1da177e4 LT |
416 | static struct scsi_target *scsi_alloc_target(struct device *parent, |
417 | int channel, uint id) | |
418 | { | |
419 | struct Scsi_Host *shost = dev_to_shost(parent); | |
420 | struct device *dev = NULL; | |
421 | unsigned long flags; | |
422 | const int size = sizeof(struct scsi_target) | |
423 | + shost->transportt->target_size; | |
5c44cd2a | 424 | struct scsi_target *starget; |
1da177e4 | 425 | struct scsi_target *found_target; |
e63ed0d7 | 426 | int error, ref_got; |
1da177e4 | 427 | |
24669f75 | 428 | starget = kzalloc(size, GFP_KERNEL); |
1da177e4 | 429 | if (!starget) { |
cadbd4a5 | 430 | printk(KERN_ERR "%s: allocation failure\n", __func__); |
1da177e4 LT |
431 | return NULL; |
432 | } | |
1da177e4 LT |
433 | dev = &starget->dev; |
434 | device_initialize(dev); | |
e63ed0d7 | 435 | kref_init(&starget->reap_ref); |
1da177e4 | 436 | dev->parent = get_device(parent); |
71610f55 | 437 | dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id); |
b0ed4336 | 438 | dev->bus = &scsi_bus_type; |
b0ed4336 | 439 | dev->type = &scsi_target_type; |
1da177e4 LT |
440 | starget->id = id; |
441 | starget->channel = channel; | |
f0c0a376 | 442 | starget->can_queue = 0; |
1da177e4 LT |
443 | INIT_LIST_HEAD(&starget->siblings); |
444 | INIT_LIST_HEAD(&starget->devices); | |
643eb2d9 | 445 | starget->state = STARGET_CREATED; |
7c9d6f16 | 446 | starget->scsi_level = SCSI_2; |
c53a284f | 447 | starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED; |
ffedb452 | 448 | retry: |
1da177e4 LT |
449 | spin_lock_irqsave(shost->host_lock, flags); |
450 | ||
451 | found_target = __scsi_find_target(parent, channel, id); | |
452 | if (found_target) | |
453 | goto found; | |
454 | ||
455 | list_add_tail(&starget->siblings, &shost->__targets); | |
456 | spin_unlock_irqrestore(shost->host_lock, flags); | |
457 | /* allocate and add */ | |
a283bd37 | 458 | transport_setup_device(dev); |
a283bd37 | 459 | if (shost->hostt->target_alloc) { |
32f95792 | 460 | error = shost->hostt->target_alloc(starget); |
a283bd37 JB |
461 | |
462 | if(error) { | |
463 | dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error); | |
464 | /* don't want scsi_target_reap to do the final | |
465 | * put because it will be under the host lock */ | |
643eb2d9 | 466 | scsi_target_destroy(starget); |
a283bd37 JB |
467 | return NULL; |
468 | } | |
469 | } | |
884d25cc | 470 | get_device(dev); |
a283bd37 | 471 | |
1da177e4 LT |
472 | return starget; |
473 | ||
474 | found: | |
e63ed0d7 JB |
475 | /* |
476 | * release routine already fired if kref is zero, so if we can still | |
477 | * take the reference, the target must be alive. If we can't, it must | |
478 | * be dying and we need to wait for a new target | |
479 | */ | |
480 | ref_got = kref_get_unless_zero(&found_target->reap_ref); | |
481 | ||
1da177e4 | 482 | spin_unlock_irqrestore(shost->host_lock, flags); |
e63ed0d7 | 483 | if (ref_got) { |
12fb8c15 | 484 | put_device(dev); |
ffedb452 JB |
485 | return found_target; |
486 | } | |
e63ed0d7 JB |
487 | /* |
488 | * Unfortunately, we found a dying target; need to wait until it's | |
489 | * dead before we can get a new one. There is an anomaly here. We | |
490 | * *should* call scsi_target_reap() to balance the kref_get() of the | |
491 | * reap_ref above. However, since the target being released, it's | |
492 | * already invisible and the reap_ref is irrelevant. If we call | |
493 | * scsi_target_reap() we might spuriously do another device_del() on | |
494 | * an already invisible target. | |
495 | */ | |
ffedb452 | 496 | put_device(&found_target->dev); |
e63ed0d7 JB |
497 | /* |
498 | * length of time is irrelevant here, we just want to yield the CPU | |
499 | * for a tick to avoid busy waiting for the target to die. | |
500 | */ | |
501 | msleep(1); | |
ffedb452 | 502 | goto retry; |
1da177e4 LT |
503 | } |
504 | ||
505 | /** | |
506 | * scsi_target_reap - check to see if target is in use and destroy if not | |
1da177e4 LT |
507 | * @starget: target to be checked |
508 | * | |
509 | * This is used after removing a LUN or doing a last put of the target | |
510 | * it checks atomically that nothing is using the target and removes | |
511 | * it if so. | |
512 | */ | |
513 | void scsi_target_reap(struct scsi_target *starget) | |
514 | { | |
f2495e22 JB |
515 | /* |
516 | * serious problem if this triggers: STARGET_DEL is only set in the if | |
517 | * the reap_ref drops to zero, so we're trying to do another final put | |
518 | * on an already released kref | |
519 | */ | |
e63ed0d7 | 520 | BUG_ON(starget->state == STARGET_DEL); |
f2495e22 | 521 | scsi_target_reap_ref_put(starget); |
1da177e4 LT |
522 | } |
523 | ||
e5b3cd42 | 524 | /** |
3846470a DB |
525 | * scsi_sanitize_inquiry_string - remove non-graphical chars from an |
526 | * INQUIRY result string | |
e5b3cd42 AS |
527 | * @s: INQUIRY result string to sanitize |
528 | * @len: length of the string | |
529 | * | |
530 | * Description: | |
531 | * The SCSI spec says that INQUIRY vendor, product, and revision | |
532 | * strings must consist entirely of graphic ASCII characters, | |
533 | * padded on the right with spaces. Since not all devices obey | |
534 | * this rule, we will replace non-graphic or non-ASCII characters | |
535 | * with spaces. Exception: a NUL character is interpreted as a | |
536 | * string terminator, so all the following characters are set to | |
537 | * spaces. | |
538 | **/ | |
3846470a | 539 | void scsi_sanitize_inquiry_string(unsigned char *s, int len) |
e5b3cd42 AS |
540 | { |
541 | int terminated = 0; | |
542 | ||
543 | for (; len > 0; (--len, ++s)) { | |
544 | if (*s == 0) | |
545 | terminated = 1; | |
546 | if (terminated || *s < 0x20 || *s > 0x7e) | |
547 | *s = ' '; | |
548 | } | |
549 | } | |
3846470a | 550 | EXPORT_SYMBOL(scsi_sanitize_inquiry_string); |
e5b3cd42 | 551 | |
1da177e4 LT |
552 | /** |
553 | * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY | |
39216033 | 554 | * @sdev: scsi_device to probe |
1da177e4 | 555 | * @inq_result: area to store the INQUIRY result |
39216033 | 556 | * @result_len: len of inq_result |
1da177e4 LT |
557 | * @bflags: store any bflags found here |
558 | * | |
559 | * Description: | |
39216033 | 560 | * Probe the lun associated with @req using a standard SCSI INQUIRY; |
1da177e4 | 561 | * |
39216033 | 562 | * If the INQUIRY is successful, zero is returned and the |
1da177e4 | 563 | * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length |
f64a181d | 564 | * are copied to the scsi_device any flags value is stored in *@bflags. |
1da177e4 | 565 | **/ |
e5b3cd42 | 566 | static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result, |
39216033 | 567 | int result_len, int *bflags) |
1da177e4 | 568 | { |
1da177e4 LT |
569 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
570 | int first_inquiry_len, try_inquiry_len, next_inquiry_len; | |
571 | int response_len = 0; | |
39216033 | 572 | int pass, count, result; |
1da177e4 LT |
573 | struct scsi_sense_hdr sshdr; |
574 | ||
575 | *bflags = 0; | |
576 | ||
577 | /* Perform up to 3 passes. The first pass uses a conservative | |
578 | * transfer length of 36 unless sdev->inquiry_len specifies a | |
579 | * different value. */ | |
580 | first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36; | |
581 | try_inquiry_len = first_inquiry_len; | |
582 | pass = 1; | |
583 | ||
584 | next_pass: | |
9ccfc756 JB |
585 | SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
586 | "scsi scan: INQUIRY pass %d length %d\n", | |
587 | pass, try_inquiry_len)); | |
1da177e4 LT |
588 | |
589 | /* Each pass gets up to three chances to ignore Unit Attention */ | |
590 | for (count = 0; count < 3; ++count) { | |
5cd3bbfa FT |
591 | int resid; |
592 | ||
1da177e4 LT |
593 | memset(scsi_cmd, 0, 6); |
594 | scsi_cmd[0] = INQUIRY; | |
595 | scsi_cmd[4] = (unsigned char) try_inquiry_len; | |
1da177e4 LT |
596 | |
597 | memset(inq_result, 0, try_inquiry_len); | |
39216033 JB |
598 | |
599 | result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, | |
ea73a9f2 | 600 | inq_result, try_inquiry_len, &sshdr, |
f4f4e47e | 601 | HZ / 2 + HZ * scsi_inq_timeout, 3, |
5cd3bbfa | 602 | &resid); |
1da177e4 | 603 | |
91921e01 HR |
604 | SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
605 | "scsi scan: INQUIRY %s with code 0x%x\n", | |
39216033 | 606 | result ? "failed" : "successful", result)); |
1da177e4 | 607 | |
39216033 | 608 | if (result) { |
1da177e4 LT |
609 | /* |
610 | * not-ready to ready transition [asc/ascq=0x28/0x0] | |
611 | * or power-on, reset [asc/ascq=0x29/0x0], continue. | |
612 | * INQUIRY should not yield UNIT_ATTENTION | |
613 | * but many buggy devices do so anyway. | |
614 | */ | |
39216033 | 615 | if ((driver_byte(result) & DRIVER_SENSE) && |
ea73a9f2 | 616 | scsi_sense_valid(&sshdr)) { |
1da177e4 LT |
617 | if ((sshdr.sense_key == UNIT_ATTENTION) && |
618 | ((sshdr.asc == 0x28) || | |
619 | (sshdr.asc == 0x29)) && | |
620 | (sshdr.ascq == 0)) | |
621 | continue; | |
622 | } | |
5cd3bbfa FT |
623 | } else { |
624 | /* | |
625 | * if nothing was transferred, we try | |
626 | * again. It's a workaround for some USB | |
627 | * devices. | |
628 | */ | |
629 | if (resid == try_inquiry_len) | |
630 | continue; | |
1da177e4 LT |
631 | } |
632 | break; | |
633 | } | |
634 | ||
39216033 | 635 | if (result == 0) { |
3846470a DB |
636 | scsi_sanitize_inquiry_string(&inq_result[8], 8); |
637 | scsi_sanitize_inquiry_string(&inq_result[16], 16); | |
638 | scsi_sanitize_inquiry_string(&inq_result[32], 4); | |
e5b3cd42 AS |
639 | |
640 | response_len = inq_result[4] + 5; | |
1da177e4 LT |
641 | if (response_len > 255) |
642 | response_len = first_inquiry_len; /* sanity */ | |
643 | ||
644 | /* | |
645 | * Get any flags for this device. | |
646 | * | |
f64a181d CH |
647 | * XXX add a bflags to scsi_device, and replace the |
648 | * corresponding bit fields in scsi_device, so bflags | |
1da177e4 LT |
649 | * need not be passed as an argument. |
650 | */ | |
651 | *bflags = scsi_get_device_flags(sdev, &inq_result[8], | |
652 | &inq_result[16]); | |
653 | ||
654 | /* When the first pass succeeds we gain information about | |
655 | * what larger transfer lengths might work. */ | |
656 | if (pass == 1) { | |
657 | if (BLIST_INQUIRY_36 & *bflags) | |
658 | next_inquiry_len = 36; | |
659 | else if (BLIST_INQUIRY_58 & *bflags) | |
660 | next_inquiry_len = 58; | |
661 | else if (sdev->inquiry_len) | |
662 | next_inquiry_len = sdev->inquiry_len; | |
663 | else | |
664 | next_inquiry_len = response_len; | |
665 | ||
666 | /* If more data is available perform the second pass */ | |
667 | if (next_inquiry_len > try_inquiry_len) { | |
668 | try_inquiry_len = next_inquiry_len; | |
669 | pass = 2; | |
670 | goto next_pass; | |
671 | } | |
672 | } | |
673 | ||
674 | } else if (pass == 2) { | |
91921e01 HR |
675 | sdev_printk(KERN_INFO, sdev, |
676 | "scsi scan: %d byte inquiry failed. " | |
677 | "Consider BLIST_INQUIRY_36 for this device\n", | |
678 | try_inquiry_len); | |
1da177e4 LT |
679 | |
680 | /* If this pass failed, the third pass goes back and transfers | |
681 | * the same amount as we successfully got in the first pass. */ | |
682 | try_inquiry_len = first_inquiry_len; | |
683 | pass = 3; | |
684 | goto next_pass; | |
685 | } | |
686 | ||
687 | /* If the last transfer attempt got an error, assume the | |
688 | * peripheral doesn't exist or is dead. */ | |
39216033 JB |
689 | if (result) |
690 | return -EIO; | |
1da177e4 LT |
691 | |
692 | /* Don't report any more data than the device says is valid */ | |
693 | sdev->inquiry_len = min(try_inquiry_len, response_len); | |
694 | ||
695 | /* | |
696 | * XXX Abort if the response length is less than 36? If less than | |
697 | * 32, the lookup of the device flags (above) could be invalid, | |
698 | * and it would be possible to take an incorrect action - we do | |
699 | * not want to hang because of a short INQUIRY. On the flip side, | |
700 | * if the device is spun down or becoming ready (and so it gives a | |
701 | * short INQUIRY), an abort here prevents any further use of the | |
702 | * device, including spin up. | |
703 | * | |
e423ee31 AS |
704 | * On the whole, the best approach seems to be to assume the first |
705 | * 36 bytes are valid no matter what the device says. That's | |
706 | * better than copying < 36 bytes to the inquiry-result buffer | |
707 | * and displaying garbage for the Vendor, Product, or Revision | |
708 | * strings. | |
709 | */ | |
710 | if (sdev->inquiry_len < 36) { | |
a35bb445 VK |
711 | if (!sdev->host->short_inquiry) { |
712 | shost_printk(KERN_INFO, sdev->host, | |
713 | "scsi scan: INQUIRY result too short (%d)," | |
714 | " using 36\n", sdev->inquiry_len); | |
715 | sdev->host->short_inquiry = 1; | |
716 | } | |
e423ee31 AS |
717 | sdev->inquiry_len = 36; |
718 | } | |
719 | ||
720 | /* | |
1da177e4 LT |
721 | * Related to the above issue: |
722 | * | |
723 | * XXX Devices (disk or all?) should be sent a TEST UNIT READY, | |
724 | * and if not ready, sent a START_STOP to start (maybe spin up) and | |
725 | * then send the INQUIRY again, since the INQUIRY can change after | |
726 | * a device is initialized. | |
727 | * | |
728 | * Ideally, start a device if explicitly asked to do so. This | |
729 | * assumes that a device is spun up on power on, spun down on | |
730 | * request, and then spun up on request. | |
731 | */ | |
732 | ||
733 | /* | |
734 | * The scanning code needs to know the scsi_level, even if no | |
735 | * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so | |
736 | * non-zero LUNs can be scanned. | |
737 | */ | |
738 | sdev->scsi_level = inq_result[2] & 0x07; | |
739 | if (sdev->scsi_level >= 2 || | |
740 | (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1)) | |
741 | sdev->scsi_level++; | |
6f3a2024 | 742 | sdev->sdev_target->scsi_level = sdev->scsi_level; |
1da177e4 | 743 | |
50c4e964 AS |
744 | /* |
745 | * If SCSI-2 or lower, and if the transport requires it, | |
746 | * store the LUN value in CDB[1]. | |
747 | */ | |
748 | sdev->lun_in_cdb = 0; | |
749 | if (sdev->scsi_level <= SCSI_2 && | |
750 | sdev->scsi_level != SCSI_UNKNOWN && | |
751 | !sdev->host->no_scsi2_lun_in_cdb) | |
752 | sdev->lun_in_cdb = 1; | |
753 | ||
39216033 | 754 | return 0; |
1da177e4 LT |
755 | } |
756 | ||
757 | /** | |
f64a181d | 758 | * scsi_add_lun - allocate and fully initialze a scsi_device |
6d877688 | 759 | * @sdev: holds information to be stored in the new scsi_device |
1da177e4 LT |
760 | * @inq_result: holds the result of a previous INQUIRY to the LUN |
761 | * @bflags: black/white list flag | |
6d877688 | 762 | * @async: 1 if this device is being scanned asynchronously |
1da177e4 LT |
763 | * |
764 | * Description: | |
6d877688 MW |
765 | * Initialize the scsi_device @sdev. Optionally set fields based |
766 | * on values in *@bflags. | |
1da177e4 LT |
767 | * |
768 | * Return: | |
f64a181d CH |
769 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device |
770 | * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized | |
1da177e4 | 771 | **/ |
e5b3cd42 | 772 | static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, |
3e082a91 | 773 | int *bflags, int async) |
1da177e4 | 774 | { |
6f4267e3 JB |
775 | int ret; |
776 | ||
1da177e4 LT |
777 | /* |
778 | * XXX do not save the inquiry, since it can change underneath us, | |
779 | * save just vendor/model/rev. | |
780 | * | |
781 | * Rather than save it and have an ioctl that retrieves the saved | |
782 | * value, have an ioctl that executes the same INQUIRY code used | |
783 | * in scsi_probe_lun, let user level programs doing INQUIRY | |
784 | * scanning run at their own risk, or supply a user level program | |
785 | * that can correctly scan. | |
786 | */ | |
09123d23 AS |
787 | |
788 | /* | |
789 | * Copy at least 36 bytes of INQUIRY data, so that we don't | |
790 | * dereference unallocated memory when accessing the Vendor, | |
791 | * Product, and Revision strings. Badly behaved devices may set | |
792 | * the INQUIRY Additional Length byte to a small value, indicating | |
793 | * these strings are invalid, but often they contain plausible data | |
794 | * nonetheless. It doesn't matter if the device sent < 36 bytes | |
795 | * total, since scsi_probe_lun() initializes inq_result with 0s. | |
796 | */ | |
797 | sdev->inquiry = kmemdup(inq_result, | |
798 | max_t(size_t, sdev->inquiry_len, 36), | |
799 | GFP_ATOMIC); | |
800 | if (sdev->inquiry == NULL) | |
1da177e4 | 801 | return SCSI_SCAN_NO_RESPONSE; |
1da177e4 | 802 | |
1da177e4 LT |
803 | sdev->vendor = (char *) (sdev->inquiry + 8); |
804 | sdev->model = (char *) (sdev->inquiry + 16); | |
805 | sdev->rev = (char *) (sdev->inquiry + 32); | |
806 | ||
14216561 JB |
807 | if (strncmp(sdev->vendor, "ATA ", 8) == 0) { |
808 | /* | |
809 | * sata emulation layer device. This is a hack to work around | |
810 | * the SATL power management specifications which state that | |
811 | * when the SATL detects the device has gone into standby | |
812 | * mode, it shall respond with NOT READY. | |
813 | */ | |
814 | sdev->allow_restart = 1; | |
815 | } | |
816 | ||
1da177e4 | 817 | if (*bflags & BLIST_ISROM) { |
6d877688 MW |
818 | sdev->type = TYPE_ROM; |
819 | sdev->removable = 1; | |
820 | } else { | |
821 | sdev->type = (inq_result[0] & 0x1f); | |
822 | sdev->removable = (inq_result[1] & 0x80) >> 7; | |
45341ca3 SJ |
823 | |
824 | /* | |
825 | * some devices may respond with wrong type for | |
826 | * well-known logical units. Force well-known type | |
827 | * to enumerate them correctly. | |
828 | */ | |
829 | if (scsi_is_wlun(sdev->lun) && sdev->type != TYPE_WLUN) { | |
830 | sdev_printk(KERN_WARNING, sdev, | |
831 | "%s: correcting incorrect peripheral device type 0x%x for W-LUN 0x%16xhN\n", | |
832 | __func__, sdev->type, (unsigned int)sdev->lun); | |
833 | sdev->type = TYPE_WLUN; | |
834 | } | |
835 | ||
6d877688 | 836 | } |
1da177e4 | 837 | |
6d877688 MW |
838 | if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) { |
839 | /* RBC and MMC devices can return SCSI-3 compliance and yet | |
840 | * still not support REPORT LUNS, so make them act as | |
841 | * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is | |
842 | * specifically set */ | |
843 | if ((*bflags & BLIST_REPORTLUN2) == 0) | |
844 | *bflags |= BLIST_NOREPORTLUN; | |
845 | } | |
846 | ||
1da177e4 LT |
847 | /* |
848 | * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI | |
849 | * spec says: The device server is capable of supporting the | |
850 | * specified peripheral device type on this logical unit. However, | |
851 | * the physical device is not currently connected to this logical | |
852 | * unit. | |
853 | * | |
854 | * The above is vague, as it implies that we could treat 001 and | |
855 | * 011 the same. Stay compatible with previous code, and create a | |
f64a181d | 856 | * scsi_device for a PQ of 1 |
1da177e4 LT |
857 | * |
858 | * Don't set the device offline here; rather let the upper | |
859 | * level drivers eval the PQ to decide whether they should | |
860 | * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check. | |
861 | */ | |
862 | ||
863 | sdev->inq_periph_qual = (inq_result[0] >> 5) & 7; | |
1da177e4 LT |
864 | sdev->lockable = sdev->removable; |
865 | sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2); | |
866 | ||
6d877688 MW |
867 | if (sdev->scsi_level >= SCSI_3 || |
868 | (sdev->inquiry_len > 56 && inq_result[56] & 0x04)) | |
1da177e4 LT |
869 | sdev->ppr = 1; |
870 | if (inq_result[7] & 0x60) | |
871 | sdev->wdtr = 1; | |
872 | if (inq_result[7] & 0x10) | |
873 | sdev->sdtr = 1; | |
874 | ||
19ac0db3 | 875 | sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d " |
4ff36718 MW |
876 | "ANSI: %d%s\n", scsi_device_type(sdev->type), |
877 | sdev->vendor, sdev->model, sdev->rev, | |
878 | sdev->inq_periph_qual, inq_result[2] & 0x07, | |
879 | (inq_result[3] & 0x0f) == 1 ? " CCS" : ""); | |
880 | ||
1da177e4 | 881 | if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) && |
c8b09f6f | 882 | !(*bflags & BLIST_NOTQ)) { |
1da177e4 | 883 | sdev->tagged_supported = 1; |
c8b09f6f CH |
884 | sdev->simple_tags = 1; |
885 | } | |
6d877688 | 886 | |
1da177e4 LT |
887 | /* |
888 | * Some devices (Texel CD ROM drives) have handshaking problems | |
889 | * when used with the Seagate controllers. borken is initialized | |
890 | * to 1, and then set it to 0 here. | |
891 | */ | |
892 | if ((*bflags & BLIST_BORKEN) == 0) | |
893 | sdev->borken = 0; | |
894 | ||
6d877688 MW |
895 | if (*bflags & BLIST_NO_ULD_ATTACH) |
896 | sdev->no_uld_attach = 1; | |
897 | ||
1da177e4 LT |
898 | /* |
899 | * Apparently some really broken devices (contrary to the SCSI | |
900 | * standards) need to be selected without asserting ATN | |
901 | */ | |
902 | if (*bflags & BLIST_SELECT_NO_ATN) | |
903 | sdev->select_no_atn = 1; | |
904 | ||
4d7db04a JB |
905 | /* |
906 | * Maximum 512 sector transfer length | |
907 | * broken RA4x00 Compaq Disk Array | |
908 | */ | |
909 | if (*bflags & BLIST_MAX_512) | |
086fa5ff | 910 | blk_queue_max_hw_sectors(sdev->request_queue, 512); |
35e9a9f9 MC |
911 | /* |
912 | * Max 1024 sector transfer length for targets that report incorrect | |
913 | * max/optimal lengths and relied on the old block layer safe default | |
914 | */ | |
915 | else if (*bflags & BLIST_MAX_1024) | |
916 | blk_queue_max_hw_sectors(sdev->request_queue, 1024); | |
4d7db04a | 917 | |
1da177e4 LT |
918 | /* |
919 | * Some devices may not want to have a start command automatically | |
920 | * issued when a device is added. | |
921 | */ | |
922 | if (*bflags & BLIST_NOSTARTONADD) | |
923 | sdev->no_start_on_add = 1; | |
924 | ||
925 | if (*bflags & BLIST_SINGLELUN) | |
25d7c363 | 926 | scsi_target(sdev)->single_lun = 1; |
1da177e4 | 927 | |
1da177e4 LT |
928 | sdev->use_10_for_rw = 1; |
929 | ||
930 | if (*bflags & BLIST_MS_SKIP_PAGE_08) | |
931 | sdev->skip_ms_page_8 = 1; | |
932 | ||
933 | if (*bflags & BLIST_MS_SKIP_PAGE_3F) | |
934 | sdev->skip_ms_page_3f = 1; | |
935 | ||
936 | if (*bflags & BLIST_USE_10_BYTE_MS) | |
937 | sdev->use_10_for_ms = 1; | |
938 | ||
0213436a JD |
939 | /* some devices don't like REPORT SUPPORTED OPERATION CODES |
940 | * and will simply timeout causing sd_mod init to take a very | |
941 | * very long time */ | |
942 | if (*bflags & BLIST_NO_RSOC) | |
943 | sdev->no_report_opcodes = 1; | |
944 | ||
1da177e4 LT |
945 | /* set the device running here so that slave configure |
946 | * may do I/O */ | |
0db6ca8a | 947 | mutex_lock(&sdev->state_mutex); |
6f4267e3 | 948 | ret = scsi_device_set_state(sdev, SDEV_RUNNING); |
0db6ca8a | 949 | if (ret) |
6f4267e3 | 950 | ret = scsi_device_set_state(sdev, SDEV_BLOCK); |
0db6ca8a | 951 | mutex_unlock(&sdev->state_mutex); |
6f4267e3 | 952 | |
0db6ca8a BVA |
953 | if (ret) { |
954 | sdev_printk(KERN_ERR, sdev, | |
955 | "in wrong state %s to complete scan\n", | |
956 | scsi_device_state_name(sdev->sdev_state)); | |
957 | return SCSI_SCAN_NO_RESPONSE; | |
6f4267e3 | 958 | } |
1da177e4 LT |
959 | |
960 | if (*bflags & BLIST_MS_192_BYTES_FOR_3F) | |
961 | sdev->use_192_bytes_for_3f = 1; | |
962 | ||
963 | if (*bflags & BLIST_NOT_LOCKABLE) | |
964 | sdev->lockable = 0; | |
965 | ||
966 | if (*bflags & BLIST_RETRY_HWERROR) | |
967 | sdev->retry_hwerror = 1; | |
968 | ||
d974e426 MP |
969 | if (*bflags & BLIST_NO_DIF) |
970 | sdev->no_dif = 1; | |
971 | ||
851cde99 HR |
972 | if (*bflags & BLIST_SYNC_ALUA) |
973 | sdev->synchronous_alua = 1; | |
974 | ||
0816c925 MP |
975 | sdev->eh_timeout = SCSI_DEFAULT_EH_TIMEOUT; |
976 | ||
c1d40a52 MP |
977 | if (*bflags & BLIST_TRY_VPD_PAGES) |
978 | sdev->try_vpd_pages = 1; | |
979 | else if (*bflags & BLIST_SKIP_VPD_PAGES) | |
56f2a801 MP |
980 | sdev->skip_vpd_pages = 1; |
981 | ||
1da177e4 LT |
982 | transport_configure_device(&sdev->sdev_gendev); |
983 | ||
93805091 | 984 | if (sdev->host->hostt->slave_configure) { |
6f4267e3 | 985 | ret = sdev->host->hostt->slave_configure(sdev); |
93805091 CH |
986 | if (ret) { |
987 | /* | |
988 | * if LLDD reports slave not present, don't clutter | |
989 | * console with alloc failure messages | |
990 | */ | |
991 | if (ret != -ENXIO) { | |
992 | sdev_printk(KERN_ERR, sdev, | |
993 | "failed to configure device\n"); | |
994 | } | |
995 | return SCSI_SCAN_NO_RESPONSE; | |
996 | } | |
997 | } | |
1da177e4 | 998 | |
b3ae8780 HR |
999 | if (sdev->scsi_level >= SCSI_3) |
1000 | scsi_attach_vpd(sdev); | |
1001 | ||
4a84067d VD |
1002 | sdev->max_queue_depth = sdev->queue_depth; |
1003 | ||
1da177e4 LT |
1004 | /* |
1005 | * Ok, the device is now all set up, we can | |
1006 | * register it and tell the rest of the kernel | |
1007 | * about it. | |
1008 | */ | |
3e082a91 | 1009 | if (!async && scsi_sysfs_add_sdev(sdev) != 0) |
b24b1033 | 1010 | return SCSI_SCAN_NO_RESPONSE; |
1da177e4 LT |
1011 | |
1012 | return SCSI_SCAN_LUN_PRESENT; | |
1013 | } | |
1014 | ||
c5f2e640 | 1015 | #ifdef CONFIG_SCSI_LOGGING |
6c7154c9 | 1016 | /** |
eb44820c | 1017 | * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace |
6c7154c9 KG |
1018 | * @buf: Output buffer with at least end-first+1 bytes of space |
1019 | * @inq: Inquiry buffer (input) | |
1020 | * @first: Offset of string into inq | |
1021 | * @end: Index after last character in inq | |
1022 | */ | |
c5f2e640 | 1023 | static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq, |
6c7154c9 KG |
1024 | unsigned first, unsigned end) |
1025 | { | |
1026 | unsigned term = 0, idx; | |
c5f2e640 | 1027 | |
1028 | for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) { | |
1029 | if (inq[idx+first] > ' ') { | |
6c7154c9 KG |
1030 | buf[idx] = inq[idx+first]; |
1031 | term = idx+1; | |
1032 | } else { | |
1033 | buf[idx] = ' '; | |
1034 | } | |
1035 | } | |
1036 | buf[term] = 0; | |
1037 | return buf; | |
1038 | } | |
c5f2e640 | 1039 | #endif |
6f3a2024 | 1040 | |
1da177e4 LT |
1041 | /** |
1042 | * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it | |
1043 | * @starget: pointer to target device structure | |
1044 | * @lun: LUN of target device | |
1da177e4 | 1045 | * @bflagsp: store bflags here if not NULL |
eb44820c | 1046 | * @sdevp: probe the LUN corresponding to this scsi_device |
1d645088 HR |
1047 | * @rescan: if not equal to SCSI_SCAN_INITIAL skip some code only |
1048 | * needed on first scan | |
eb44820c | 1049 | * @hostdata: passed to scsi_alloc_sdev() |
1da177e4 LT |
1050 | * |
1051 | * Description: | |
1052 | * Call scsi_probe_lun, if a LUN with an attached device is found, | |
1053 | * allocate and set it up by calling scsi_add_lun. | |
1054 | * | |
1055 | * Return: | |
f64a181d | 1056 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device |
1da177e4 LT |
1057 | * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is |
1058 | * attached at the LUN | |
f64a181d | 1059 | * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized |
1da177e4 LT |
1060 | **/ |
1061 | static int scsi_probe_and_add_lun(struct scsi_target *starget, | |
9cb78c16 | 1062 | u64 lun, int *bflagsp, |
1d645088 HR |
1063 | struct scsi_device **sdevp, |
1064 | enum scsi_scan_mode rescan, | |
1da177e4 LT |
1065 | void *hostdata) |
1066 | { | |
1067 | struct scsi_device *sdev; | |
1da177e4 | 1068 | unsigned char *result; |
39216033 | 1069 | int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256; |
1da177e4 LT |
1070 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
1071 | ||
1072 | /* | |
1073 | * The rescan flag is used as an optimization, the first scan of a | |
1074 | * host adapter calls into here with rescan == 0. | |
1075 | */ | |
6f3a2024 JB |
1076 | sdev = scsi_device_lookup_by_target(starget, lun); |
1077 | if (sdev) { | |
1d645088 | 1078 | if (rescan != SCSI_SCAN_INITIAL || !scsi_device_created(sdev)) { |
91921e01 | 1079 | SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
1da177e4 | 1080 | "scsi scan: device exists on %s\n", |
71610f55 | 1081 | dev_name(&sdev->sdev_gendev))); |
1da177e4 LT |
1082 | if (sdevp) |
1083 | *sdevp = sdev; | |
1084 | else | |
1085 | scsi_device_put(sdev); | |
1086 | ||
1087 | if (bflagsp) | |
1088 | *bflagsp = scsi_get_device_flags(sdev, | |
1089 | sdev->vendor, | |
1090 | sdev->model); | |
1091 | return SCSI_SCAN_LUN_PRESENT; | |
1092 | } | |
6f3a2024 JB |
1093 | scsi_device_put(sdev); |
1094 | } else | |
1095 | sdev = scsi_alloc_sdev(starget, lun, hostdata); | |
1da177e4 LT |
1096 | if (!sdev) |
1097 | goto out; | |
39216033 JB |
1098 | |
1099 | result = kmalloc(result_len, GFP_ATOMIC | | |
bc86120a | 1100 | ((shost->unchecked_isa_dma) ? __GFP_DMA : 0)); |
1da177e4 | 1101 | if (!result) |
39216033 | 1102 | goto out_free_sdev; |
1da177e4 | 1103 | |
39216033 | 1104 | if (scsi_probe_lun(sdev, result, result_len, &bflags)) |
1da177e4 LT |
1105 | goto out_free_result; |
1106 | ||
4186ab19 KG |
1107 | if (bflagsp) |
1108 | *bflagsp = bflags; | |
1da177e4 LT |
1109 | /* |
1110 | * result contains valid SCSI INQUIRY data. | |
1111 | */ | |
13f7e5ac | 1112 | if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) { |
1da177e4 LT |
1113 | /* |
1114 | * For a Peripheral qualifier 3 (011b), the SCSI | |
1115 | * spec says: The device server is not capable of | |
1116 | * supporting a physical device on this logical | |
1117 | * unit. | |
1118 | * | |
1119 | * For disks, this implies that there is no | |
1120 | * logical disk configured at sdev->lun, but there | |
1121 | * is a target id responding. | |
1122 | */ | |
6c7154c9 KG |
1123 | SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:" |
1124 | " peripheral qualifier of 3, device not" | |
1125 | " added\n")) | |
1126 | if (lun == 0) { | |
c5f2e640 | 1127 | SCSI_LOG_SCAN_BUS(1, { |
1128 | unsigned char vend[9]; | |
1129 | unsigned char mod[17]; | |
1130 | ||
1131 | sdev_printk(KERN_INFO, sdev, | |
6c7154c9 | 1132 | "scsi scan: consider passing scsi_mod." |
3424a65d | 1133 | "dev_flags=%s:%s:0x240 or 0x1000240\n", |
6c7154c9 | 1134 | scsi_inq_str(vend, result, 8, 16), |
c5f2e640 | 1135 | scsi_inq_str(mod, result, 16, 32)); |
1136 | }); | |
643eb2d9 | 1137 | |
6c7154c9 | 1138 | } |
643eb2d9 | 1139 | |
1da177e4 LT |
1140 | res = SCSI_SCAN_TARGET_PRESENT; |
1141 | goto out_free_result; | |
1142 | } | |
1143 | ||
1bfc5d9d | 1144 | /* |
84961f28 | 1145 | * Some targets may set slight variations of PQ and PDT to signal |
1146 | * that no LUN is present, so don't add sdev in these cases. | |
1147 | * Two specific examples are: | |
1148 | * 1) NetApp targets: return PQ=1, PDT=0x1f | |
1149 | * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved" | |
1150 | * in the UFI 1.0 spec (we cannot rely on reserved bits). | |
1151 | * | |
1152 | * References: | |
1153 | * 1) SCSI SPC-3, pp. 145-146 | |
1154 | * PQ=1: "A peripheral device having the specified peripheral | |
1155 | * device type is not connected to this logical unit. However, the | |
1156 | * device server is capable of supporting the specified peripheral | |
1157 | * device type on this logical unit." | |
1158 | * PDT=0x1f: "Unknown or no device type" | |
1159 | * 2) USB UFI 1.0, p. 20 | |
1160 | * PDT=00h Direct-access device (floppy) | |
1161 | * PDT=1Fh none (no FDD connected to the requested logical unit) | |
1bfc5d9d | 1162 | */ |
84961f28 | 1163 | if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) && |
01b291bd JB |
1164 | (result[0] & 0x1f) == 0x1f && |
1165 | !scsi_is_wlun(lun)) { | |
91921e01 | 1166 | SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
1bfc5d9d AS |
1167 | "scsi scan: peripheral device type" |
1168 | " of 31, no device added\n")); | |
1169 | res = SCSI_SCAN_TARGET_PRESENT; | |
1170 | goto out_free_result; | |
1171 | } | |
1172 | ||
3e082a91 | 1173 | res = scsi_add_lun(sdev, result, &bflags, shost->async_scan); |
1da177e4 LT |
1174 | if (res == SCSI_SCAN_LUN_PRESENT) { |
1175 | if (bflags & BLIST_KEY) { | |
1176 | sdev->lockable = 0; | |
39216033 | 1177 | scsi_unlock_floptical(sdev, result); |
1da177e4 | 1178 | } |
1da177e4 LT |
1179 | } |
1180 | ||
1181 | out_free_result: | |
1182 | kfree(result); | |
1da177e4 LT |
1183 | out_free_sdev: |
1184 | if (res == SCSI_SCAN_LUN_PRESENT) { | |
1185 | if (sdevp) { | |
b70d37bf AS |
1186 | if (scsi_device_get(sdev) == 0) { |
1187 | *sdevp = sdev; | |
1188 | } else { | |
1189 | __scsi_remove_device(sdev); | |
1190 | res = SCSI_SCAN_NO_RESPONSE; | |
1191 | } | |
1da177e4 | 1192 | } |
6f3a2024 | 1193 | } else |
860dc736 | 1194 | __scsi_remove_device(sdev); |
1da177e4 LT |
1195 | out: |
1196 | return res; | |
1197 | } | |
1198 | ||
1199 | /** | |
1200 | * scsi_sequential_lun_scan - sequentially scan a SCSI target | |
1201 | * @starget: pointer to target structure to scan | |
1202 | * @bflags: black/white list flag for LUN 0 | |
eb44820c RL |
1203 | * @scsi_level: Which version of the standard does this device adhere to |
1204 | * @rescan: passed to scsi_probe_add_lun() | |
1da177e4 LT |
1205 | * |
1206 | * Description: | |
1207 | * Generally, scan from LUN 1 (LUN 0 is assumed to already have been | |
1208 | * scanned) to some maximum lun until a LUN is found with no device | |
1209 | * attached. Use the bflags to figure out any oddities. | |
1210 | * | |
1211 | * Modifies sdevscan->lun. | |
1212 | **/ | |
1213 | static void scsi_sequential_lun_scan(struct scsi_target *starget, | |
1d645088 HR |
1214 | int bflags, int scsi_level, |
1215 | enum scsi_scan_mode rescan) | |
1da177e4 | 1216 | { |
9cb78c16 HR |
1217 | uint max_dev_lun; |
1218 | u64 sparse_lun, lun; | |
1da177e4 LT |
1219 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
1220 | ||
91921e01 HR |
1221 | SCSI_LOG_SCAN_BUS(3, starget_printk(KERN_INFO, starget, |
1222 | "scsi scan: Sequential scan\n")); | |
1da177e4 LT |
1223 | |
1224 | max_dev_lun = min(max_scsi_luns, shost->max_lun); | |
1225 | /* | |
1226 | * If this device is known to support sparse multiple units, | |
1227 | * override the other settings, and scan all of them. Normally, | |
1228 | * SCSI-3 devices should be scanned via the REPORT LUNS. | |
1229 | */ | |
1230 | if (bflags & BLIST_SPARSELUN) { | |
1231 | max_dev_lun = shost->max_lun; | |
1232 | sparse_lun = 1; | |
1233 | } else | |
1234 | sparse_lun = 0; | |
1235 | ||
1da177e4 | 1236 | /* |
fb0d82f4 | 1237 | * If less than SCSI_1_CCS, and no special lun scanning, stop |
1da177e4 | 1238 | * scanning; this matches 2.4 behaviour, but could just be a bug |
fb0d82f4 | 1239 | * (to continue scanning a SCSI_1_CCS device). |
1da177e4 LT |
1240 | * |
1241 | * This test is broken. We might not have any device on lun0 for | |
1242 | * a sparselun device, and if that's the case then how would we | |
1243 | * know the real scsi_level, eh? It might make sense to just not | |
1244 | * scan any SCSI_1 device for non-0 luns, but that check would best | |
1245 | * go into scsi_alloc_sdev() and just have it return null when asked | |
1246 | * to alloc an sdev for lun > 0 on an already found SCSI_1 device. | |
1247 | * | |
1248 | if ((sdevscan->scsi_level < SCSI_1_CCS) && | |
1249 | ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN)) | |
1250 | == 0)) | |
1251 | return; | |
1252 | */ | |
1253 | /* | |
1254 | * If this device is known to support multiple units, override | |
1255 | * the other settings, and scan all of them. | |
1256 | */ | |
1257 | if (bflags & BLIST_FORCELUN) | |
1258 | max_dev_lun = shost->max_lun; | |
1259 | /* | |
1260 | * REGAL CDC-4X: avoid hang after LUN 4 | |
1261 | */ | |
1262 | if (bflags & BLIST_MAX5LUN) | |
1263 | max_dev_lun = min(5U, max_dev_lun); | |
1264 | /* | |
1265 | * Do not scan SCSI-2 or lower device past LUN 7, unless | |
1266 | * BLIST_LARGELUN. | |
1267 | */ | |
1268 | if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN)) | |
1269 | max_dev_lun = min(8U, max_dev_lun); | |
1270 | ||
22ffeb48 HR |
1271 | /* |
1272 | * Stop scanning at 255 unless BLIST_SCSI3LUN | |
1273 | */ | |
1274 | if (!(bflags & BLIST_SCSI3LUN)) | |
1275 | max_dev_lun = min(256U, max_dev_lun); | |
1276 | ||
1da177e4 LT |
1277 | /* |
1278 | * We have already scanned LUN 0, so start at LUN 1. Keep scanning | |
1279 | * until we reach the max, or no LUN is found and we are not | |
1280 | * sparse_lun. | |
1281 | */ | |
1282 | for (lun = 1; lun < max_dev_lun; ++lun) | |
1283 | if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, | |
1284 | NULL) != SCSI_SCAN_LUN_PRESENT) && | |
1285 | !sparse_lun) | |
1286 | return; | |
1287 | } | |
1288 | ||
1da177e4 LT |
1289 | /** |
1290 | * scsi_report_lun_scan - Scan using SCSI REPORT LUN results | |
eb44820c RL |
1291 | * @starget: which target |
1292 | * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN | |
1293 | * @rescan: nonzero if we can skip code only needed on first scan | |
1da177e4 LT |
1294 | * |
1295 | * Description: | |
eb44820c RL |
1296 | * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command. |
1297 | * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun. | |
1da177e4 | 1298 | * |
eb44820c RL |
1299 | * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8 |
1300 | * LUNs even if it's older than SCSI-3. | |
1301 | * If BLIST_NOREPORTLUN is set, return 1 always. | |
1302 | * If BLIST_NOLUN is set, return 0 always. | |
09b6b51b | 1303 | * If starget->no_report_luns is set, return 1 always. |
1da177e4 LT |
1304 | * |
1305 | * Return: | |
1306 | * 0: scan completed (or no memory, so further scanning is futile) | |
eb44820c | 1307 | * 1: could not scan with REPORT LUN |
1da177e4 | 1308 | **/ |
6f3a2024 | 1309 | static int scsi_report_lun_scan(struct scsi_target *starget, int bflags, |
1d645088 | 1310 | enum scsi_scan_mode rescan) |
1da177e4 | 1311 | { |
1da177e4 LT |
1312 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
1313 | unsigned int length; | |
9cb78c16 | 1314 | u64 lun; |
1da177e4 LT |
1315 | unsigned int num_luns; |
1316 | unsigned int retries; | |
39216033 | 1317 | int result; |
1da177e4 | 1318 | struct scsi_lun *lunp, *lun_data; |
1da177e4 | 1319 | struct scsi_sense_hdr sshdr; |
6f3a2024 JB |
1320 | struct scsi_device *sdev; |
1321 | struct Scsi_Host *shost = dev_to_shost(&starget->dev); | |
2ef89198 | 1322 | int ret = 0; |
1da177e4 LT |
1323 | |
1324 | /* | |
1325 | * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set. | |
1326 | * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does | |
1327 | * support more than 8 LUNs. | |
09b6b51b | 1328 | * Don't attempt if the target doesn't support REPORT LUNS. |
1da177e4 | 1329 | */ |
4d7db04a JB |
1330 | if (bflags & BLIST_NOREPORTLUN) |
1331 | return 1; | |
1332 | if (starget->scsi_level < SCSI_2 && | |
1333 | starget->scsi_level != SCSI_UNKNOWN) | |
1334 | return 1; | |
1335 | if (starget->scsi_level < SCSI_3 && | |
1336 | (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) | |
1da177e4 LT |
1337 | return 1; |
1338 | if (bflags & BLIST_NOLUN) | |
1339 | return 0; | |
09b6b51b AS |
1340 | if (starget->no_report_luns) |
1341 | return 1; | |
1da177e4 | 1342 | |
6f3a2024 JB |
1343 | if (!(sdev = scsi_device_lookup_by_target(starget, 0))) { |
1344 | sdev = scsi_alloc_sdev(starget, 0, NULL); | |
1345 | if (!sdev) | |
1346 | return 0; | |
75f8ee8e AS |
1347 | if (scsi_device_get(sdev)) { |
1348 | __scsi_remove_device(sdev); | |
6f3a2024 | 1349 | return 0; |
75f8ee8e | 1350 | } |
6f3a2024 JB |
1351 | } |
1352 | ||
1da177e4 LT |
1353 | /* |
1354 | * Allocate enough to hold the header (the same size as one scsi_lun) | |
acd6d738 RE |
1355 | * plus the number of luns we are requesting. 511 was the default |
1356 | * value of the now removed max_report_luns parameter. | |
1da177e4 | 1357 | */ |
acd6d738 RE |
1358 | length = (511 + 1) * sizeof(struct scsi_lun); |
1359 | retry: | |
eb9eea01 | 1360 | lun_data = kmalloc(length, GFP_KERNEL | |
1da177e4 | 1361 | (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0)); |
6f3a2024 | 1362 | if (!lun_data) { |
cadbd4a5 | 1363 | printk(ALLOC_FAILURE_MSG, __func__); |
39216033 | 1364 | goto out; |
6f3a2024 | 1365 | } |
1da177e4 LT |
1366 | |
1367 | scsi_cmd[0] = REPORT_LUNS; | |
1368 | ||
1369 | /* | |
1370 | * bytes 1 - 5: reserved, set to zero. | |
1371 | */ | |
1372 | memset(&scsi_cmd[1], 0, 5); | |
1373 | ||
1374 | /* | |
1375 | * bytes 6 - 9: length of the command. | |
1376 | */ | |
2a904e5d | 1377 | put_unaligned_be32(length, &scsi_cmd[6]); |
1da177e4 LT |
1378 | |
1379 | scsi_cmd[10] = 0; /* reserved */ | |
1380 | scsi_cmd[11] = 0; /* control */ | |
1da177e4 LT |
1381 | |
1382 | /* | |
1383 | * We can get a UNIT ATTENTION, for example a power on/reset, so | |
1384 | * retry a few times (like sd.c does for TEST UNIT READY). | |
1385 | * Experience shows some combinations of adapter/devices get at | |
1386 | * least two power on/resets. | |
1387 | * | |
1388 | * Illegal requests (for devices that do not support REPORT LUNS) | |
1389 | * should come through as a check condition, and will not generate | |
1390 | * a retry. | |
1391 | */ | |
1392 | for (retries = 0; retries < 3; retries++) { | |
91921e01 HR |
1393 | SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, |
1394 | "scsi scan: Sending REPORT LUNS to (try %d)\n", | |
1da177e4 | 1395 | retries)); |
39216033 | 1396 | |
39216033 | 1397 | result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, |
ea73a9f2 | 1398 | lun_data, length, &sshdr, |
b39c9a66 | 1399 | SCSI_REPORT_LUNS_TIMEOUT, 3, NULL); |
39216033 | 1400 | |
91921e01 HR |
1401 | SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, |
1402 | "scsi scan: REPORT LUNS" | |
1403 | " %s (try %d) result 0x%x\n", | |
1404 | result ? "failed" : "successful", | |
1405 | retries, result)); | |
39216033 | 1406 | if (result == 0) |
1da177e4 | 1407 | break; |
ea73a9f2 | 1408 | else if (scsi_sense_valid(&sshdr)) { |
1da177e4 LT |
1409 | if (sshdr.sense_key != UNIT_ATTENTION) |
1410 | break; | |
1411 | } | |
1412 | } | |
1413 | ||
39216033 | 1414 | if (result) { |
1da177e4 LT |
1415 | /* |
1416 | * The device probably does not support a REPORT LUN command | |
1417 | */ | |
2ef89198 AS |
1418 | ret = 1; |
1419 | goto out_err; | |
1da177e4 | 1420 | } |
1da177e4 LT |
1421 | |
1422 | /* | |
1423 | * Get the length from the first four bytes of lun_data. | |
1424 | */ | |
acd6d738 RE |
1425 | if (get_unaligned_be32(lun_data->scsi_lun) + |
1426 | sizeof(struct scsi_lun) > length) { | |
1427 | length = get_unaligned_be32(lun_data->scsi_lun) + | |
1428 | sizeof(struct scsi_lun); | |
1429 | kfree(lun_data); | |
1430 | goto retry; | |
1431 | } | |
2a904e5d | 1432 | length = get_unaligned_be32(lun_data->scsi_lun); |
1da177e4 LT |
1433 | |
1434 | num_luns = (length / sizeof(struct scsi_lun)); | |
1da177e4 | 1435 | |
3bf743e7 JG |
1436 | SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, |
1437 | "scsi scan: REPORT LUN scan\n")); | |
1da177e4 LT |
1438 | |
1439 | /* | |
1440 | * Scan the luns in lun_data. The entry at offset 0 is really | |
1441 | * the header, so start at 1 and go up to and including num_luns. | |
1442 | */ | |
1443 | for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) { | |
1444 | lun = scsilun_to_int(lunp); | |
1445 | ||
9cb78c16 | 1446 | if (lun > sdev->host->max_lun) { |
91921e01 HR |
1447 | sdev_printk(KERN_WARNING, sdev, |
1448 | "lun%llu has a LUN larger than" | |
1449 | " allowed by the host adapter\n", lun); | |
1da177e4 LT |
1450 | } else { |
1451 | int res; | |
1452 | ||
1453 | res = scsi_probe_and_add_lun(starget, | |
1454 | lun, NULL, NULL, rescan, NULL); | |
1455 | if (res == SCSI_SCAN_NO_RESPONSE) { | |
1456 | /* | |
1457 | * Got some results, but now none, abort. | |
1458 | */ | |
3bf743e7 JG |
1459 | sdev_printk(KERN_ERR, sdev, |
1460 | "Unexpected response" | |
9cb78c16 HR |
1461 | " from lun %llu while scanning, scan" |
1462 | " aborted\n", (unsigned long long)lun); | |
1da177e4 LT |
1463 | break; |
1464 | } | |
1465 | } | |
1466 | } | |
1467 | ||
2ef89198 | 1468 | out_err: |
1da177e4 | 1469 | kfree(lun_data); |
1da177e4 | 1470 | out: |
0f1d87a2 | 1471 | if (scsi_device_created(sdev)) |
6f3a2024 JB |
1472 | /* |
1473 | * the sdev we used didn't appear in the report luns scan | |
1474 | */ | |
860dc736 | 1475 | __scsi_remove_device(sdev); |
bcd8f2e9 | 1476 | scsi_device_put(sdev); |
2ef89198 | 1477 | return ret; |
1da177e4 LT |
1478 | } |
1479 | ||
1480 | struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel, | |
9cb78c16 | 1481 | uint id, u64 lun, void *hostdata) |
1da177e4 | 1482 | { |
a97a83a0 | 1483 | struct scsi_device *sdev = ERR_PTR(-ENODEV); |
1da177e4 | 1484 | struct device *parent = &shost->shost_gendev; |
e02f3f59 | 1485 | struct scsi_target *starget; |
1da177e4 | 1486 | |
938e2ac0 MW |
1487 | if (strncmp(scsi_scan_type, "none", 4) == 0) |
1488 | return ERR_PTR(-ENODEV); | |
1489 | ||
e02f3f59 | 1490 | starget = scsi_alloc_target(parent, channel, id); |
1da177e4 LT |
1491 | if (!starget) |
1492 | return ERR_PTR(-ENOMEM); | |
bc4f2401 | 1493 | scsi_autopm_get_target(starget); |
1da177e4 | 1494 | |
0b950672 | 1495 | mutex_lock(&shost->scan_mutex); |
6b7f123f MW |
1496 | if (!shost->async_scan) |
1497 | scsi_complete_async_scans(); | |
1498 | ||
bc4f2401 | 1499 | if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) { |
a97a83a0 | 1500 | scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata); |
bc4f2401 AS |
1501 | scsi_autopm_put_host(shost); |
1502 | } | |
0b950672 | 1503 | mutex_unlock(&shost->scan_mutex); |
bc4f2401 | 1504 | scsi_autopm_put_target(starget); |
e63ed0d7 JB |
1505 | /* |
1506 | * paired with scsi_alloc_target(). Target will be destroyed unless | |
1507 | * scsi_probe_and_add_lun made an underlying device visible | |
1508 | */ | |
1da177e4 LT |
1509 | scsi_target_reap(starget); |
1510 | put_device(&starget->dev); | |
1511 | ||
1512 | return sdev; | |
1513 | } | |
1514 | EXPORT_SYMBOL(__scsi_add_device); | |
1515 | ||
146f7262 | 1516 | int scsi_add_device(struct Scsi_Host *host, uint channel, |
9cb78c16 | 1517 | uint target, u64 lun) |
146f7262 JB |
1518 | { |
1519 | struct scsi_device *sdev = | |
1520 | __scsi_add_device(host, channel, target, lun, NULL); | |
1521 | if (IS_ERR(sdev)) | |
1522 | return PTR_ERR(sdev); | |
1523 | ||
1524 | scsi_device_put(sdev); | |
1525 | return 0; | |
1526 | } | |
1527 | EXPORT_SYMBOL(scsi_add_device); | |
1528 | ||
1da177e4 LT |
1529 | void scsi_rescan_device(struct device *dev) |
1530 | { | |
d3d32891 HR |
1531 | struct scsi_device *sdev = to_scsi_device(dev); |
1532 | ||
e27829dc | 1533 | device_lock(dev); |
09e2b0b1 | 1534 | |
d3d32891 HR |
1535 | scsi_attach_vpd(sdev); |
1536 | ||
1537 | if (sdev->handler && sdev->handler->rescan) | |
1538 | sdev->handler->rescan(sdev); | |
09e2b0b1 | 1539 | |
e27829dc | 1540 | if (dev->driver && try_module_get(dev->driver->owner)) { |
3af6b352 CH |
1541 | struct scsi_driver *drv = to_scsi_driver(dev->driver); |
1542 | ||
1da177e4 LT |
1543 | if (drv->rescan) |
1544 | drv->rescan(dev); | |
3af6b352 | 1545 | module_put(dev->driver->owner); |
1da177e4 | 1546 | } |
e27829dc | 1547 | device_unlock(dev); |
1da177e4 LT |
1548 | } |
1549 | EXPORT_SYMBOL(scsi_rescan_device); | |
1550 | ||
e517d313 | 1551 | static void __scsi_scan_target(struct device *parent, unsigned int channel, |
1d645088 | 1552 | unsigned int id, u64 lun, enum scsi_scan_mode rescan) |
1da177e4 LT |
1553 | { |
1554 | struct Scsi_Host *shost = dev_to_shost(parent); | |
1555 | int bflags = 0; | |
1556 | int res; | |
1da177e4 LT |
1557 | struct scsi_target *starget; |
1558 | ||
1559 | if (shost->this_id == id) | |
1560 | /* | |
1561 | * Don't scan the host adapter | |
1562 | */ | |
1563 | return; | |
1564 | ||
1da177e4 | 1565 | starget = scsi_alloc_target(parent, channel, id); |
1da177e4 LT |
1566 | if (!starget) |
1567 | return; | |
bc4f2401 | 1568 | scsi_autopm_get_target(starget); |
1da177e4 | 1569 | |
1da177e4 LT |
1570 | if (lun != SCAN_WILD_CARD) { |
1571 | /* | |
1572 | * Scan for a specific host/chan/id/lun. | |
1573 | */ | |
1574 | scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL); | |
1575 | goto out_reap; | |
1576 | } | |
1577 | ||
1578 | /* | |
1579 | * Scan LUN 0, if there is some response, scan further. Ideally, we | |
1580 | * would not configure LUN 0 until all LUNs are scanned. | |
1581 | */ | |
6f3a2024 JB |
1582 | res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL); |
1583 | if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) { | |
1584 | if (scsi_report_lun_scan(starget, bflags, rescan) != 0) | |
1da177e4 LT |
1585 | /* |
1586 | * The REPORT LUN did not scan the target, | |
1587 | * do a sequential scan. | |
1588 | */ | |
1589 | scsi_sequential_lun_scan(starget, bflags, | |
4186ab19 | 1590 | starget->scsi_level, rescan); |
1da177e4 | 1591 | } |
1da177e4 LT |
1592 | |
1593 | out_reap: | |
bc4f2401 | 1594 | scsi_autopm_put_target(starget); |
e63ed0d7 JB |
1595 | /* |
1596 | * paired with scsi_alloc_target(): determine if the target has | |
1597 | * any children at all and if not, nuke it | |
1598 | */ | |
1da177e4 LT |
1599 | scsi_target_reap(starget); |
1600 | ||
1601 | put_device(&starget->dev); | |
1602 | } | |
e517d313 AS |
1603 | |
1604 | /** | |
e59e4a09 | 1605 | * scsi_scan_target - scan a target id, possibly including all LUNs on the target. |
e517d313 AS |
1606 | * @parent: host to scan |
1607 | * @channel: channel to scan | |
1608 | * @id: target id to scan | |
1609 | * @lun: Specific LUN to scan or SCAN_WILD_CARD | |
1d645088 HR |
1610 | * @rescan: passed to LUN scanning routines; SCSI_SCAN_INITIAL for |
1611 | * no rescan, SCSI_SCAN_RESCAN to rescan existing LUNs, | |
1612 | * and SCSI_SCAN_MANUAL to force scanning even if | |
1613 | * 'scan=manual' is set. | |
e517d313 AS |
1614 | * |
1615 | * Description: | |
1616 | * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0, | |
1617 | * and possibly all LUNs on the target id. | |
1618 | * | |
1619 | * First try a REPORT LUN scan, if that does not scan the target, do a | |
1620 | * sequential scan of LUNs on the target id. | |
1621 | **/ | |
1622 | void scsi_scan_target(struct device *parent, unsigned int channel, | |
1d645088 | 1623 | unsigned int id, u64 lun, enum scsi_scan_mode rescan) |
e517d313 AS |
1624 | { |
1625 | struct Scsi_Host *shost = dev_to_shost(parent); | |
1626 | ||
93b45af5 MW |
1627 | if (strncmp(scsi_scan_type, "none", 4) == 0) |
1628 | return; | |
1629 | ||
1d645088 HR |
1630 | if (rescan != SCSI_SCAN_MANUAL && |
1631 | strncmp(scsi_scan_type, "manual", 6) == 0) | |
1632 | return; | |
1633 | ||
6b7f123f | 1634 | mutex_lock(&shost->scan_mutex); |
3e082a91 MW |
1635 | if (!shost->async_scan) |
1636 | scsi_complete_async_scans(); | |
1637 | ||
bc4f2401 | 1638 | if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) { |
e517d313 | 1639 | __scsi_scan_target(parent, channel, id, lun, rescan); |
bc4f2401 AS |
1640 | scsi_autopm_put_host(shost); |
1641 | } | |
0b950672 | 1642 | mutex_unlock(&shost->scan_mutex); |
e517d313 | 1643 | } |
1da177e4 LT |
1644 | EXPORT_SYMBOL(scsi_scan_target); |
1645 | ||
1646 | static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel, | |
1d645088 HR |
1647 | unsigned int id, u64 lun, |
1648 | enum scsi_scan_mode rescan) | |
1da177e4 LT |
1649 | { |
1650 | uint order_id; | |
1651 | ||
1652 | if (id == SCAN_WILD_CARD) | |
1653 | for (id = 0; id < shost->max_id; ++id) { | |
1654 | /* | |
1655 | * XXX adapter drivers when possible (FCP, iSCSI) | |
1656 | * could modify max_id to match the current max, | |
1657 | * not the absolute max. | |
1658 | * | |
1659 | * XXX add a shost id iterator, so for example, | |
1660 | * the FC ID can be the same as a target id | |
1661 | * without a huge overhead of sparse id's. | |
1662 | */ | |
1663 | if (shost->reverse_ordering) | |
1664 | /* | |
1665 | * Scan from high to low id. | |
1666 | */ | |
1667 | order_id = shost->max_id - id - 1; | |
1668 | else | |
1669 | order_id = id; | |
e517d313 AS |
1670 | __scsi_scan_target(&shost->shost_gendev, channel, |
1671 | order_id, lun, rescan); | |
1da177e4 LT |
1672 | } |
1673 | else | |
e517d313 AS |
1674 | __scsi_scan_target(&shost->shost_gendev, channel, |
1675 | id, lun, rescan); | |
1da177e4 LT |
1676 | } |
1677 | ||
1678 | int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel, | |
1d645088 HR |
1679 | unsigned int id, u64 lun, |
1680 | enum scsi_scan_mode rescan) | |
1da177e4 | 1681 | { |
3bf743e7 | 1682 | SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost, |
9cb78c16 | 1683 | "%s: <%u:%u:%llu>\n", |
cadbd4a5 | 1684 | __func__, channel, id, lun)); |
1da177e4 LT |
1685 | |
1686 | if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) || | |
091686d3 | 1687 | ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) || |
605c6dbe | 1688 | ((lun != SCAN_WILD_CARD) && (lun >= shost->max_lun))) |
1da177e4 LT |
1689 | return -EINVAL; |
1690 | ||
0b950672 | 1691 | mutex_lock(&shost->scan_mutex); |
6b7f123f MW |
1692 | if (!shost->async_scan) |
1693 | scsi_complete_async_scans(); | |
1694 | ||
bc4f2401 | 1695 | if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) { |
82f29467 MA |
1696 | if (channel == SCAN_WILD_CARD) |
1697 | for (channel = 0; channel <= shost->max_channel; | |
1698 | channel++) | |
1699 | scsi_scan_channel(shost, channel, id, lun, | |
1700 | rescan); | |
1701 | else | |
1da177e4 | 1702 | scsi_scan_channel(shost, channel, id, lun, rescan); |
bc4f2401 | 1703 | scsi_autopm_put_host(shost); |
82f29467 | 1704 | } |
0b950672 | 1705 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
1706 | |
1707 | return 0; | |
1708 | } | |
1709 | ||
3e082a91 MW |
1710 | static void scsi_sysfs_add_devices(struct Scsi_Host *shost) |
1711 | { | |
1712 | struct scsi_device *sdev; | |
1713 | shost_for_each_device(sdev, shost) { | |
3b661a92 DW |
1714 | /* target removed before the device could be added */ |
1715 | if (sdev->sdev_state == SDEV_DEL) | |
1716 | continue; | |
693ad5ba SJ |
1717 | /* If device is already visible, skip adding it to sysfs */ |
1718 | if (sdev->is_visible) | |
1719 | continue; | |
6b7f123f MW |
1720 | if (!scsi_host_scan_allowed(shost) || |
1721 | scsi_sysfs_add_sdev(sdev) != 0) | |
860dc736 | 1722 | __scsi_remove_device(sdev); |
3e082a91 MW |
1723 | } |
1724 | } | |
1725 | ||
1726 | /** | |
1727 | * scsi_prep_async_scan - prepare for an async scan | |
1728 | * @shost: the host which will be scanned | |
1729 | * Returns: a cookie to be passed to scsi_finish_async_scan() | |
1730 | * | |
1731 | * Tells the midlayer this host is going to do an asynchronous scan. | |
1732 | * It reserves the host's position in the scanning list and ensures | |
1733 | * that other asynchronous scans started after this one won't affect the | |
1734 | * ordering of the discovered devices. | |
1735 | */ | |
1aa8fab2 | 1736 | static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost) |
3e082a91 MW |
1737 | { |
1738 | struct async_scan_data *data; | |
6b7f123f | 1739 | unsigned long flags; |
3e082a91 MW |
1740 | |
1741 | if (strncmp(scsi_scan_type, "sync", 4) == 0) | |
1742 | return NULL; | |
1743 | ||
1744 | if (shost->async_scan) { | |
a4cf30e1 | 1745 | shost_printk(KERN_DEBUG, shost, "%s called twice\n", __func__); |
3e082a91 MW |
1746 | return NULL; |
1747 | } | |
1748 | ||
1749 | data = kmalloc(sizeof(*data), GFP_KERNEL); | |
1750 | if (!data) | |
1751 | goto err; | |
1752 | data->shost = scsi_host_get(shost); | |
1753 | if (!data->shost) | |
1754 | goto err; | |
1755 | init_completion(&data->prev_finished); | |
1756 | ||
6b7f123f MW |
1757 | mutex_lock(&shost->scan_mutex); |
1758 | spin_lock_irqsave(shost->host_lock, flags); | |
3e082a91 | 1759 | shost->async_scan = 1; |
6b7f123f MW |
1760 | spin_unlock_irqrestore(shost->host_lock, flags); |
1761 | mutex_unlock(&shost->scan_mutex); | |
1762 | ||
1763 | spin_lock(&async_scan_lock); | |
3e082a91 MW |
1764 | if (list_empty(&scanning_hosts)) |
1765 | complete(&data->prev_finished); | |
1766 | list_add_tail(&data->list, &scanning_hosts); | |
1767 | spin_unlock(&async_scan_lock); | |
1768 | ||
1769 | return data; | |
1770 | ||
1771 | err: | |
1772 | kfree(data); | |
1773 | return NULL; | |
1774 | } | |
1775 | ||
1776 | /** | |
1777 | * scsi_finish_async_scan - asynchronous scan has finished | |
1778 | * @data: cookie returned from earlier call to scsi_prep_async_scan() | |
1779 | * | |
1780 | * All the devices currently attached to this host have been found. | |
1781 | * This function announces all the devices it has found to the rest | |
1782 | * of the system. | |
1783 | */ | |
1aa8fab2 | 1784 | static void scsi_finish_async_scan(struct async_scan_data *data) |
3e082a91 MW |
1785 | { |
1786 | struct Scsi_Host *shost; | |
6b7f123f | 1787 | unsigned long flags; |
3e082a91 MW |
1788 | |
1789 | if (!data) | |
1790 | return; | |
1791 | ||
1792 | shost = data->shost; | |
6b7f123f MW |
1793 | |
1794 | mutex_lock(&shost->scan_mutex); | |
1795 | ||
3e082a91 | 1796 | if (!shost->async_scan) { |
91921e01 | 1797 | shost_printk(KERN_INFO, shost, "%s called twice\n", __func__); |
3e082a91 | 1798 | dump_stack(); |
773e82f6 | 1799 | mutex_unlock(&shost->scan_mutex); |
3e082a91 MW |
1800 | return; |
1801 | } | |
1802 | ||
1803 | wait_for_completion(&data->prev_finished); | |
1804 | ||
1805 | scsi_sysfs_add_devices(shost); | |
1806 | ||
6b7f123f | 1807 | spin_lock_irqsave(shost->host_lock, flags); |
3e082a91 | 1808 | shost->async_scan = 0; |
6b7f123f MW |
1809 | spin_unlock_irqrestore(shost->host_lock, flags); |
1810 | ||
1811 | mutex_unlock(&shost->scan_mutex); | |
1812 | ||
1813 | spin_lock(&async_scan_lock); | |
3e082a91 MW |
1814 | list_del(&data->list); |
1815 | if (!list_empty(&scanning_hosts)) { | |
1816 | struct async_scan_data *next = list_entry(scanning_hosts.next, | |
1817 | struct async_scan_data, list); | |
1818 | complete(&next->prev_finished); | |
1819 | } | |
1820 | spin_unlock(&async_scan_lock); | |
1821 | ||
267a6ad4 | 1822 | scsi_autopm_put_host(shost); |
3e082a91 MW |
1823 | scsi_host_put(shost); |
1824 | kfree(data); | |
1825 | } | |
1826 | ||
1aa8fab2 | 1827 | static void do_scsi_scan_host(struct Scsi_Host *shost) |
3e082a91 | 1828 | { |
1aa8fab2 MW |
1829 | if (shost->hostt->scan_finished) { |
1830 | unsigned long start = jiffies; | |
1831 | if (shost->hostt->scan_start) | |
1832 | shost->hostt->scan_start(shost); | |
1833 | ||
1834 | while (!shost->hostt->scan_finished(shost, jiffies - start)) | |
1835 | msleep(10); | |
1836 | } else { | |
1837 | scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD, | |
3e082a91 | 1838 | SCAN_WILD_CARD, 0); |
1aa8fab2 MW |
1839 | } |
1840 | } | |
3e082a91 | 1841 | |
6cdd5520 | 1842 | static void do_scan_async(void *_data, async_cookie_t c) |
1aa8fab2 MW |
1843 | { |
1844 | struct async_scan_data *data = _data; | |
bc4f2401 AS |
1845 | struct Scsi_Host *shost = data->shost; |
1846 | ||
1847 | do_scsi_scan_host(shost); | |
3e082a91 | 1848 | scsi_finish_async_scan(data); |
3e082a91 MW |
1849 | } |
1850 | ||
1da177e4 LT |
1851 | /** |
1852 | * scsi_scan_host - scan the given adapter | |
1853 | * @shost: adapter to scan | |
1854 | **/ | |
1855 | void scsi_scan_host(struct Scsi_Host *shost) | |
1856 | { | |
3e082a91 MW |
1857 | struct async_scan_data *data; |
1858 | ||
1d645088 HR |
1859 | if (strncmp(scsi_scan_type, "none", 4) == 0 || |
1860 | strncmp(scsi_scan_type, "manual", 6) == 0) | |
3e082a91 | 1861 | return; |
bc4f2401 AS |
1862 | if (scsi_autopm_get_host(shost) < 0) |
1863 | return; | |
3e082a91 MW |
1864 | |
1865 | data = scsi_prep_async_scan(shost); | |
1866 | if (!data) { | |
1aa8fab2 | 1867 | do_scsi_scan_host(shost); |
bc4f2401 | 1868 | scsi_autopm_put_host(shost); |
3e082a91 MW |
1869 | return; |
1870 | } | |
1aa8fab2 | 1871 | |
6cdd5520 DW |
1872 | /* register with the async subsystem so wait_for_device_probe() |
1873 | * will flush this work | |
1874 | */ | |
1875 | async_schedule(do_scan_async, data); | |
1876 | ||
267a6ad4 | 1877 | /* scsi_autopm_put_host(shost) is called in scsi_finish_async_scan() */ |
1da177e4 LT |
1878 | } |
1879 | EXPORT_SYMBOL(scsi_scan_host); | |
1880 | ||
1da177e4 LT |
1881 | void scsi_forget_host(struct Scsi_Host *shost) |
1882 | { | |
a64358db | 1883 | struct scsi_device *sdev; |
1da177e4 LT |
1884 | unsigned long flags; |
1885 | ||
a64358db | 1886 | restart: |
1da177e4 | 1887 | spin_lock_irqsave(shost->host_lock, flags); |
a64358db AS |
1888 | list_for_each_entry(sdev, &shost->__devices, siblings) { |
1889 | if (sdev->sdev_state == SDEV_DEL) | |
1890 | continue; | |
1da177e4 | 1891 | spin_unlock_irqrestore(shost->host_lock, flags); |
a64358db AS |
1892 | __scsi_remove_device(sdev); |
1893 | goto restart; | |
1da177e4 LT |
1894 | } |
1895 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1896 | } | |
1897 | ||
9f6aa575 RD |
1898 | /** |
1899 | * scsi_get_host_dev - Create a scsi_device that points to the host adapter itself | |
1900 | * @shost: Host that needs a scsi_device | |
1da177e4 LT |
1901 | * |
1902 | * Lock status: None assumed. | |
1903 | * | |
f64a181d | 1904 | * Returns: The scsi_device or NULL |
1da177e4 LT |
1905 | * |
1906 | * Notes: | |
f64a181d | 1907 | * Attach a single scsi_device to the Scsi_Host - this should |
1da177e4 LT |
1908 | * be made to look like a "pseudo-device" that points to the |
1909 | * HA itself. | |
1910 | * | |
1911 | * Note - this device is not accessible from any high-level | |
1912 | * drivers (including generics), which is probably not | |
9f6aa575 | 1913 | * optimal. We can add hooks later to attach. |
1da177e4 LT |
1914 | */ |
1915 | struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost) | |
1916 | { | |
e517d313 | 1917 | struct scsi_device *sdev = NULL; |
1da177e4 LT |
1918 | struct scsi_target *starget; |
1919 | ||
0b950672 | 1920 | mutex_lock(&shost->scan_mutex); |
e517d313 AS |
1921 | if (!scsi_host_scan_allowed(shost)) |
1922 | goto out; | |
1da177e4 LT |
1923 | starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id); |
1924 | if (!starget) | |
e517d313 | 1925 | goto out; |
1da177e4 LT |
1926 | |
1927 | sdev = scsi_alloc_sdev(starget, 0, NULL); | |
d5469119 | 1928 | if (sdev) |
1da177e4 | 1929 | sdev->borken = 0; |
d5469119 | 1930 | else |
884d25cc | 1931 | scsi_target_reap(starget); |
1da177e4 | 1932 | put_device(&starget->dev); |
e517d313 | 1933 | out: |
0b950672 | 1934 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
1935 | return sdev; |
1936 | } | |
1937 | EXPORT_SYMBOL(scsi_get_host_dev); | |
1938 | ||
9f6aa575 RD |
1939 | /** |
1940 | * scsi_free_host_dev - Free a scsi_device that points to the host adapter itself | |
1941 | * @sdev: Host device to be freed | |
1da177e4 LT |
1942 | * |
1943 | * Lock status: None assumed. | |
1944 | * | |
1945 | * Returns: Nothing | |
1da177e4 LT |
1946 | */ |
1947 | void scsi_free_host_dev(struct scsi_device *sdev) | |
1948 | { | |
1949 | BUG_ON(sdev->id != sdev->host->this_id); | |
1950 | ||
860dc736 | 1951 | __scsi_remove_device(sdev); |
1da177e4 LT |
1952 | } |
1953 | EXPORT_SYMBOL(scsi_free_host_dev); | |
1954 |