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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 | ||
1d645088 | 100 | 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 | ||
125 | /** | |
126 | * scsi_complete_async_scans - Wait for asynchronous scans to complete | |
127 | * | |
8bcc2412 MW |
128 | * When this function returns, any host which started scanning before |
129 | * this function was called will have finished its scan. Hosts which | |
130 | * started scanning after this function was called may or may not have | |
131 | * finished. | |
3e082a91 MW |
132 | */ |
133 | int scsi_complete_async_scans(void) | |
134 | { | |
135 | struct async_scan_data *data; | |
136 | ||
137 | do { | |
138 | if (list_empty(&scanning_hosts)) | |
e96eb23d | 139 | return 0; |
3e082a91 MW |
140 | /* If we can't get memory immediately, that's OK. Just |
141 | * sleep a little. Even if we never get memory, the async | |
142 | * scans will finish eventually. | |
143 | */ | |
144 | data = kmalloc(sizeof(*data), GFP_KERNEL); | |
145 | if (!data) | |
146 | msleep(1); | |
147 | } while (!data); | |
148 | ||
149 | data->shost = NULL; | |
150 | init_completion(&data->prev_finished); | |
151 | ||
152 | spin_lock(&async_scan_lock); | |
153 | /* Check that there's still somebody else on the list */ | |
154 | if (list_empty(&scanning_hosts)) | |
155 | goto done; | |
156 | list_add_tail(&data->list, &scanning_hosts); | |
157 | spin_unlock(&async_scan_lock); | |
158 | ||
159 | printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n"); | |
160 | wait_for_completion(&data->prev_finished); | |
161 | ||
162 | spin_lock(&async_scan_lock); | |
163 | list_del(&data->list); | |
8bcc2412 MW |
164 | if (!list_empty(&scanning_hosts)) { |
165 | struct async_scan_data *next = list_entry(scanning_hosts.next, | |
166 | struct async_scan_data, list); | |
167 | complete(&next->prev_finished); | |
168 | } | |
3e082a91 MW |
169 | done: |
170 | spin_unlock(&async_scan_lock); | |
43a8d39d | 171 | |
e96eb23d | 172 | kfree(data); |
3e082a91 MW |
173 | return 0; |
174 | } | |
175 | ||
1da177e4 LT |
176 | /** |
177 | * scsi_unlock_floptical - unlock device via a special MODE SENSE command | |
39216033 | 178 | * @sdev: scsi device to send command to |
1da177e4 LT |
179 | * @result: area to store the result of the MODE SENSE |
180 | * | |
181 | * Description: | |
39216033 | 182 | * Send a vendor specific MODE SENSE (not a MODE SELECT) command. |
1da177e4 LT |
183 | * Called for BLIST_KEY devices. |
184 | **/ | |
39216033 | 185 | static void scsi_unlock_floptical(struct scsi_device *sdev, |
1da177e4 LT |
186 | unsigned char *result) |
187 | { | |
188 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
189 | ||
91921e01 | 190 | sdev_printk(KERN_NOTICE, sdev, "unlocking floptical drive\n"); |
1da177e4 LT |
191 | scsi_cmd[0] = MODE_SENSE; |
192 | scsi_cmd[1] = 0; | |
193 | scsi_cmd[2] = 0x2e; | |
194 | scsi_cmd[3] = 0; | |
39216033 | 195 | scsi_cmd[4] = 0x2a; /* size */ |
1da177e4 | 196 | scsi_cmd[5] = 0; |
39216033 | 197 | scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL, |
f4f4e47e | 198 | SCSI_TIMEOUT, 3, NULL); |
1da177e4 LT |
199 | } |
200 | ||
1da177e4 LT |
201 | /** |
202 | * scsi_alloc_sdev - allocate and setup a scsi_Device | |
eb44820c RL |
203 | * @starget: which target to allocate a &scsi_device for |
204 | * @lun: which lun | |
205 | * @hostdata: usually NULL and set by ->slave_alloc instead | |
1da177e4 LT |
206 | * |
207 | * Description: | |
208 | * Allocate, initialize for io, and return a pointer to a scsi_Device. | |
209 | * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and | |
210 | * adds scsi_Device to the appropriate list. | |
211 | * | |
212 | * Return value: | |
213 | * scsi_Device pointer, or NULL on failure. | |
214 | **/ | |
215 | static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, | |
9cb78c16 | 216 | u64 lun, void *hostdata) |
1da177e4 LT |
217 | { |
218 | struct scsi_device *sdev; | |
219 | int display_failure_msg = 1, ret; | |
220 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
221 | ||
24669f75 | 222 | sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size, |
1749ef00 | 223 | GFP_KERNEL); |
1da177e4 LT |
224 | if (!sdev) |
225 | goto out; | |
226 | ||
1da177e4 LT |
227 | sdev->vendor = scsi_null_device_strs; |
228 | sdev->model = scsi_null_device_strs; | |
229 | sdev->rev = scsi_null_device_strs; | |
230 | sdev->host = shost; | |
4a84067d | 231 | sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD; |
1da177e4 LT |
232 | sdev->id = starget->id; |
233 | sdev->lun = lun; | |
234 | sdev->channel = starget->channel; | |
0db6ca8a | 235 | mutex_init(&sdev->state_mutex); |
1da177e4 LT |
236 | sdev->sdev_state = SDEV_CREATED; |
237 | INIT_LIST_HEAD(&sdev->siblings); | |
238 | INIT_LIST_HEAD(&sdev->same_target_siblings); | |
239 | INIT_LIST_HEAD(&sdev->cmd_list); | |
240 | INIT_LIST_HEAD(&sdev->starved_entry); | |
a341cd0f | 241 | INIT_LIST_HEAD(&sdev->event_list); |
1da177e4 | 242 | spin_lock_init(&sdev->list_lock); |
09e2b0b1 | 243 | mutex_init(&sdev->inquiry_mutex); |
a341cd0f | 244 | INIT_WORK(&sdev->event_work, scsi_evt_thread); |
9937a5e2 | 245 | INIT_WORK(&sdev->requeue_work, scsi_requeue_run_queue); |
1da177e4 LT |
246 | |
247 | sdev->sdev_gendev.parent = get_device(&starget->dev); | |
248 | sdev->sdev_target = starget; | |
249 | ||
250 | /* usually NULL and set by ->slave_alloc instead */ | |
251 | sdev->hostdata = hostdata; | |
252 | ||
253 | /* if the device needs this changing, it may do so in the | |
254 | * slave_configure function */ | |
255 | sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED; | |
256 | ||
257 | /* | |
258 | * Some low level driver could use device->type | |
259 | */ | |
260 | sdev->type = -1; | |
261 | ||
262 | /* | |
263 | * Assume that the device will have handshaking problems, | |
264 | * and then fix this field later if it turns out it | |
265 | * doesn't | |
266 | */ | |
267 | sdev->borken = 1; | |
268 | ||
f664a3cc | 269 | sdev->request_queue = scsi_mq_alloc_queue(sdev); |
1da177e4 LT |
270 | if (!sdev->request_queue) { |
271 | /* release fn is set up in scsi_sysfs_device_initialise, so | |
272 | * have to free and put manually here */ | |
273 | put_device(&starget->dev); | |
93f56089 | 274 | kfree(sdev); |
1da177e4 LT |
275 | goto out; |
276 | } | |
09ac46c4 | 277 | WARN_ON_ONCE(!blk_get_queue(sdev->request_queue)); |
1da177e4 | 278 | sdev->request_queue->queuedata = sdev; |
2ecb204d | 279 | |
ef10b169 JB |
280 | scsi_change_queue_depth(sdev, sdev->host->cmd_per_lun ? |
281 | sdev->host->cmd_per_lun : 1); | |
1da177e4 LT |
282 | |
283 | scsi_sysfs_device_initialize(sdev); | |
284 | ||
285 | if (shost->hostt->slave_alloc) { | |
286 | ret = shost->hostt->slave_alloc(sdev); | |
287 | if (ret) { | |
288 | /* | |
289 | * if LLDD reports slave not present, don't clutter | |
290 | * console with alloc failure messages | |
1da177e4 LT |
291 | */ |
292 | if (ret == -ENXIO) | |
293 | display_failure_msg = 0; | |
294 | goto out_device_destroy; | |
295 | } | |
296 | } | |
297 | ||
298 | return sdev; | |
299 | ||
300 | out_device_destroy: | |
4e6c82b3 | 301 | __scsi_remove_device(sdev); |
1da177e4 LT |
302 | out: |
303 | if (display_failure_msg) | |
cadbd4a5 | 304 | printk(ALLOC_FAILURE_MSG, __func__); |
1da177e4 LT |
305 | return NULL; |
306 | } | |
307 | ||
643eb2d9 JB |
308 | static void scsi_target_destroy(struct scsi_target *starget) |
309 | { | |
310 | struct device *dev = &starget->dev; | |
311 | struct Scsi_Host *shost = dev_to_shost(dev->parent); | |
312 | unsigned long flags; | |
313 | ||
f05795d3 | 314 | BUG_ON(starget->state == STARGET_DEL); |
f2495e22 | 315 | starget->state = STARGET_DEL; |
643eb2d9 JB |
316 | transport_destroy_device(dev); |
317 | spin_lock_irqsave(shost->host_lock, flags); | |
318 | if (shost->hostt->target_destroy) | |
319 | shost->hostt->target_destroy(starget); | |
320 | list_del_init(&starget->siblings); | |
321 | spin_unlock_irqrestore(shost->host_lock, flags); | |
322 | put_device(dev); | |
323 | } | |
324 | ||
1da177e4 LT |
325 | static void scsi_target_dev_release(struct device *dev) |
326 | { | |
327 | struct device *parent = dev->parent; | |
328 | struct scsi_target *starget = to_scsi_target(dev); | |
a283bd37 | 329 | |
1da177e4 LT |
330 | kfree(starget); |
331 | put_device(parent); | |
332 | } | |
333 | ||
453cd0f3 | 334 | static struct device_type scsi_target_type = { |
b0ed4336 HR |
335 | .name = "scsi_target", |
336 | .release = scsi_target_dev_release, | |
337 | }; | |
338 | ||
1da177e4 LT |
339 | int scsi_is_target_device(const struct device *dev) |
340 | { | |
b0ed4336 | 341 | return dev->type == &scsi_target_type; |
1da177e4 LT |
342 | } |
343 | EXPORT_SYMBOL(scsi_is_target_device); | |
344 | ||
345 | static struct scsi_target *__scsi_find_target(struct device *parent, | |
346 | int channel, uint id) | |
347 | { | |
348 | struct scsi_target *starget, *found_starget = NULL; | |
349 | struct Scsi_Host *shost = dev_to_shost(parent); | |
350 | /* | |
351 | * Search for an existing target for this sdev. | |
352 | */ | |
353 | list_for_each_entry(starget, &shost->__targets, siblings) { | |
354 | if (starget->id == id && | |
355 | starget->channel == channel) { | |
356 | found_starget = starget; | |
357 | break; | |
358 | } | |
359 | } | |
360 | if (found_starget) | |
361 | get_device(&found_starget->dev); | |
362 | ||
363 | return found_starget; | |
364 | } | |
365 | ||
e63ed0d7 JB |
366 | /** |
367 | * scsi_target_reap_ref_release - remove target from visibility | |
368 | * @kref: the reap_ref in the target being released | |
369 | * | |
370 | * Called on last put of reap_ref, which is the indication that no device | |
371 | * under this target is visible anymore, so render the target invisible in | |
372 | * sysfs. Note: we have to be in user context here because the target reaps | |
373 | * should be done in places where the scsi device visibility is being removed. | |
374 | */ | |
375 | static void scsi_target_reap_ref_release(struct kref *kref) | |
376 | { | |
377 | struct scsi_target *starget | |
378 | = container_of(kref, struct scsi_target, reap_ref); | |
379 | ||
f2495e22 | 380 | /* |
f9279c96 | 381 | * if we get here and the target is still in a CREATED state that |
f2495e22 JB |
382 | * means it was allocated but never made visible (because a scan |
383 | * turned up no LUNs), so don't call device_del() on it. | |
384 | */ | |
f9279c96 EM |
385 | if ((starget->state != STARGET_CREATED) && |
386 | (starget->state != STARGET_CREATED_REMOVE)) { | |
f2495e22 JB |
387 | transport_remove_device(&starget->dev); |
388 | device_del(&starget->dev); | |
389 | } | |
e63ed0d7 JB |
390 | scsi_target_destroy(starget); |
391 | } | |
392 | ||
393 | static void scsi_target_reap_ref_put(struct scsi_target *starget) | |
394 | { | |
395 | kref_put(&starget->reap_ref, scsi_target_reap_ref_release); | |
396 | } | |
397 | ||
884d25cc JB |
398 | /** |
399 | * scsi_alloc_target - allocate a new or find an existing target | |
400 | * @parent: parent of the target (need not be a scsi host) | |
401 | * @channel: target channel number (zero if no channels) | |
402 | * @id: target id number | |
403 | * | |
404 | * Return an existing target if one exists, provided it hasn't already | |
405 | * gone into STARGET_DEL state, otherwise allocate a new target. | |
406 | * | |
407 | * The target is returned with an incremented reference, so the caller | |
408 | * is responsible for both reaping and doing a last put | |
409 | */ | |
1da177e4 LT |
410 | static struct scsi_target *scsi_alloc_target(struct device *parent, |
411 | int channel, uint id) | |
412 | { | |
413 | struct Scsi_Host *shost = dev_to_shost(parent); | |
414 | struct device *dev = NULL; | |
415 | unsigned long flags; | |
416 | const int size = sizeof(struct scsi_target) | |
417 | + shost->transportt->target_size; | |
5c44cd2a | 418 | struct scsi_target *starget; |
1da177e4 | 419 | struct scsi_target *found_target; |
e63ed0d7 | 420 | int error, ref_got; |
1da177e4 | 421 | |
24669f75 | 422 | starget = kzalloc(size, GFP_KERNEL); |
1da177e4 | 423 | if (!starget) { |
cadbd4a5 | 424 | printk(KERN_ERR "%s: allocation failure\n", __func__); |
1da177e4 LT |
425 | return NULL; |
426 | } | |
1da177e4 LT |
427 | dev = &starget->dev; |
428 | device_initialize(dev); | |
e63ed0d7 | 429 | kref_init(&starget->reap_ref); |
1da177e4 | 430 | dev->parent = get_device(parent); |
71610f55 | 431 | dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id); |
b0ed4336 | 432 | dev->bus = &scsi_bus_type; |
b0ed4336 | 433 | dev->type = &scsi_target_type; |
1da177e4 LT |
434 | starget->id = id; |
435 | starget->channel = channel; | |
f0c0a376 | 436 | starget->can_queue = 0; |
1da177e4 LT |
437 | INIT_LIST_HEAD(&starget->siblings); |
438 | INIT_LIST_HEAD(&starget->devices); | |
643eb2d9 | 439 | starget->state = STARGET_CREATED; |
7c9d6f16 | 440 | starget->scsi_level = SCSI_2; |
c53a284f | 441 | starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED; |
ffedb452 | 442 | retry: |
1da177e4 LT |
443 | spin_lock_irqsave(shost->host_lock, flags); |
444 | ||
445 | found_target = __scsi_find_target(parent, channel, id); | |
446 | if (found_target) | |
447 | goto found; | |
448 | ||
449 | list_add_tail(&starget->siblings, &shost->__targets); | |
450 | spin_unlock_irqrestore(shost->host_lock, flags); | |
451 | /* allocate and add */ | |
a283bd37 | 452 | transport_setup_device(dev); |
a283bd37 | 453 | if (shost->hostt->target_alloc) { |
32f95792 | 454 | error = shost->hostt->target_alloc(starget); |
a283bd37 JB |
455 | |
456 | if(error) { | |
457 | dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error); | |
458 | /* don't want scsi_target_reap to do the final | |
459 | * put because it will be under the host lock */ | |
643eb2d9 | 460 | scsi_target_destroy(starget); |
a283bd37 JB |
461 | return NULL; |
462 | } | |
463 | } | |
884d25cc | 464 | get_device(dev); |
a283bd37 | 465 | |
1da177e4 LT |
466 | return starget; |
467 | ||
468 | found: | |
e63ed0d7 JB |
469 | /* |
470 | * release routine already fired if kref is zero, so if we can still | |
471 | * take the reference, the target must be alive. If we can't, it must | |
472 | * be dying and we need to wait for a new target | |
473 | */ | |
474 | ref_got = kref_get_unless_zero(&found_target->reap_ref); | |
475 | ||
1da177e4 | 476 | spin_unlock_irqrestore(shost->host_lock, flags); |
e63ed0d7 | 477 | if (ref_got) { |
12fb8c15 | 478 | put_device(dev); |
ffedb452 JB |
479 | return found_target; |
480 | } | |
e63ed0d7 JB |
481 | /* |
482 | * Unfortunately, we found a dying target; need to wait until it's | |
483 | * dead before we can get a new one. There is an anomaly here. We | |
484 | * *should* call scsi_target_reap() to balance the kref_get() of the | |
485 | * reap_ref above. However, since the target being released, it's | |
486 | * already invisible and the reap_ref is irrelevant. If we call | |
487 | * scsi_target_reap() we might spuriously do another device_del() on | |
488 | * an already invisible target. | |
489 | */ | |
ffedb452 | 490 | put_device(&found_target->dev); |
e63ed0d7 JB |
491 | /* |
492 | * length of time is irrelevant here, we just want to yield the CPU | |
493 | * for a tick to avoid busy waiting for the target to die. | |
494 | */ | |
495 | msleep(1); | |
ffedb452 | 496 | goto retry; |
1da177e4 LT |
497 | } |
498 | ||
499 | /** | |
500 | * scsi_target_reap - check to see if target is in use and destroy if not | |
1da177e4 LT |
501 | * @starget: target to be checked |
502 | * | |
503 | * This is used after removing a LUN or doing a last put of the target | |
504 | * it checks atomically that nothing is using the target and removes | |
505 | * it if so. | |
506 | */ | |
507 | void scsi_target_reap(struct scsi_target *starget) | |
508 | { | |
f2495e22 JB |
509 | /* |
510 | * serious problem if this triggers: STARGET_DEL is only set in the if | |
511 | * the reap_ref drops to zero, so we're trying to do another final put | |
512 | * on an already released kref | |
513 | */ | |
e63ed0d7 | 514 | BUG_ON(starget->state == STARGET_DEL); |
f2495e22 | 515 | scsi_target_reap_ref_put(starget); |
1da177e4 LT |
516 | } |
517 | ||
e5b3cd42 | 518 | /** |
3846470a DB |
519 | * scsi_sanitize_inquiry_string - remove non-graphical chars from an |
520 | * INQUIRY result string | |
e5b3cd42 AS |
521 | * @s: INQUIRY result string to sanitize |
522 | * @len: length of the string | |
523 | * | |
524 | * Description: | |
525 | * The SCSI spec says that INQUIRY vendor, product, and revision | |
526 | * strings must consist entirely of graphic ASCII characters, | |
527 | * padded on the right with spaces. Since not all devices obey | |
528 | * this rule, we will replace non-graphic or non-ASCII characters | |
529 | * with spaces. Exception: a NUL character is interpreted as a | |
530 | * string terminator, so all the following characters are set to | |
531 | * spaces. | |
532 | **/ | |
3846470a | 533 | void scsi_sanitize_inquiry_string(unsigned char *s, int len) |
e5b3cd42 AS |
534 | { |
535 | int terminated = 0; | |
536 | ||
537 | for (; len > 0; (--len, ++s)) { | |
538 | if (*s == 0) | |
539 | terminated = 1; | |
540 | if (terminated || *s < 0x20 || *s > 0x7e) | |
541 | *s = ' '; | |
542 | } | |
543 | } | |
3846470a | 544 | EXPORT_SYMBOL(scsi_sanitize_inquiry_string); |
e5b3cd42 | 545 | |
1da177e4 LT |
546 | /** |
547 | * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY | |
39216033 | 548 | * @sdev: scsi_device to probe |
1da177e4 | 549 | * @inq_result: area to store the INQUIRY result |
39216033 | 550 | * @result_len: len of inq_result |
1da177e4 LT |
551 | * @bflags: store any bflags found here |
552 | * | |
553 | * Description: | |
39216033 | 554 | * Probe the lun associated with @req using a standard SCSI INQUIRY; |
1da177e4 | 555 | * |
39216033 | 556 | * If the INQUIRY is successful, zero is returned and the |
1da177e4 | 557 | * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length |
f64a181d | 558 | * are copied to the scsi_device any flags value is stored in *@bflags. |
1da177e4 | 559 | **/ |
e5b3cd42 | 560 | static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result, |
5ebde469 | 561 | int result_len, blist_flags_t *bflags) |
1da177e4 | 562 | { |
1da177e4 LT |
563 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
564 | int first_inquiry_len, try_inquiry_len, next_inquiry_len; | |
565 | int response_len = 0; | |
39216033 | 566 | int pass, count, result; |
1da177e4 LT |
567 | struct scsi_sense_hdr sshdr; |
568 | ||
569 | *bflags = 0; | |
570 | ||
571 | /* Perform up to 3 passes. The first pass uses a conservative | |
572 | * transfer length of 36 unless sdev->inquiry_len specifies a | |
573 | * different value. */ | |
574 | first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36; | |
575 | try_inquiry_len = first_inquiry_len; | |
576 | pass = 1; | |
577 | ||
578 | next_pass: | |
9ccfc756 JB |
579 | SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
580 | "scsi scan: INQUIRY pass %d length %d\n", | |
581 | pass, try_inquiry_len)); | |
1da177e4 LT |
582 | |
583 | /* Each pass gets up to three chances to ignore Unit Attention */ | |
584 | for (count = 0; count < 3; ++count) { | |
5cd3bbfa FT |
585 | int resid; |
586 | ||
1da177e4 LT |
587 | memset(scsi_cmd, 0, 6); |
588 | scsi_cmd[0] = INQUIRY; | |
589 | scsi_cmd[4] = (unsigned char) try_inquiry_len; | |
1da177e4 LT |
590 | |
591 | memset(inq_result, 0, try_inquiry_len); | |
39216033 JB |
592 | |
593 | result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, | |
ea73a9f2 | 594 | inq_result, try_inquiry_len, &sshdr, |
f4f4e47e | 595 | HZ / 2 + HZ * scsi_inq_timeout, 3, |
5cd3bbfa | 596 | &resid); |
1da177e4 | 597 | |
91921e01 HR |
598 | SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
599 | "scsi scan: INQUIRY %s with code 0x%x\n", | |
39216033 | 600 | result ? "failed" : "successful", result)); |
1da177e4 | 601 | |
39216033 | 602 | if (result) { |
1da177e4 LT |
603 | /* |
604 | * not-ready to ready transition [asc/ascq=0x28/0x0] | |
605 | * or power-on, reset [asc/ascq=0x29/0x0], continue. | |
606 | * INQUIRY should not yield UNIT_ATTENTION | |
607 | * but many buggy devices do so anyway. | |
608 | */ | |
c65be1a6 | 609 | if (driver_byte(result) == DRIVER_SENSE && |
ea73a9f2 | 610 | scsi_sense_valid(&sshdr)) { |
1da177e4 LT |
611 | if ((sshdr.sense_key == UNIT_ATTENTION) && |
612 | ((sshdr.asc == 0x28) || | |
613 | (sshdr.asc == 0x29)) && | |
614 | (sshdr.ascq == 0)) | |
615 | continue; | |
616 | } | |
5cd3bbfa FT |
617 | } else { |
618 | /* | |
619 | * if nothing was transferred, we try | |
620 | * again. It's a workaround for some USB | |
621 | * devices. | |
622 | */ | |
623 | if (resid == try_inquiry_len) | |
624 | continue; | |
1da177e4 LT |
625 | } |
626 | break; | |
627 | } | |
628 | ||
39216033 | 629 | if (result == 0) { |
3846470a DB |
630 | scsi_sanitize_inquiry_string(&inq_result[8], 8); |
631 | scsi_sanitize_inquiry_string(&inq_result[16], 16); | |
632 | scsi_sanitize_inquiry_string(&inq_result[32], 4); | |
e5b3cd42 AS |
633 | |
634 | response_len = inq_result[4] + 5; | |
1da177e4 LT |
635 | if (response_len > 255) |
636 | response_len = first_inquiry_len; /* sanity */ | |
637 | ||
638 | /* | |
639 | * Get any flags for this device. | |
640 | * | |
f64a181d CH |
641 | * XXX add a bflags to scsi_device, and replace the |
642 | * corresponding bit fields in scsi_device, so bflags | |
1da177e4 LT |
643 | * need not be passed as an argument. |
644 | */ | |
645 | *bflags = scsi_get_device_flags(sdev, &inq_result[8], | |
646 | &inq_result[16]); | |
647 | ||
648 | /* When the first pass succeeds we gain information about | |
649 | * what larger transfer lengths might work. */ | |
650 | if (pass == 1) { | |
651 | if (BLIST_INQUIRY_36 & *bflags) | |
652 | next_inquiry_len = 36; | |
1da177e4 LT |
653 | else if (sdev->inquiry_len) |
654 | next_inquiry_len = sdev->inquiry_len; | |
655 | else | |
656 | next_inquiry_len = response_len; | |
657 | ||
658 | /* If more data is available perform the second pass */ | |
659 | if (next_inquiry_len > try_inquiry_len) { | |
660 | try_inquiry_len = next_inquiry_len; | |
661 | pass = 2; | |
662 | goto next_pass; | |
663 | } | |
664 | } | |
665 | ||
666 | } else if (pass == 2) { | |
91921e01 HR |
667 | sdev_printk(KERN_INFO, sdev, |
668 | "scsi scan: %d byte inquiry failed. " | |
669 | "Consider BLIST_INQUIRY_36 for this device\n", | |
670 | try_inquiry_len); | |
1da177e4 LT |
671 | |
672 | /* If this pass failed, the third pass goes back and transfers | |
673 | * the same amount as we successfully got in the first pass. */ | |
674 | try_inquiry_len = first_inquiry_len; | |
675 | pass = 3; | |
676 | goto next_pass; | |
677 | } | |
678 | ||
679 | /* If the last transfer attempt got an error, assume the | |
680 | * peripheral doesn't exist or is dead. */ | |
39216033 JB |
681 | if (result) |
682 | return -EIO; | |
1da177e4 LT |
683 | |
684 | /* Don't report any more data than the device says is valid */ | |
685 | sdev->inquiry_len = min(try_inquiry_len, response_len); | |
686 | ||
687 | /* | |
688 | * XXX Abort if the response length is less than 36? If less than | |
689 | * 32, the lookup of the device flags (above) could be invalid, | |
690 | * and it would be possible to take an incorrect action - we do | |
691 | * not want to hang because of a short INQUIRY. On the flip side, | |
692 | * if the device is spun down or becoming ready (and so it gives a | |
693 | * short INQUIRY), an abort here prevents any further use of the | |
694 | * device, including spin up. | |
695 | * | |
e423ee31 AS |
696 | * On the whole, the best approach seems to be to assume the first |
697 | * 36 bytes are valid no matter what the device says. That's | |
698 | * better than copying < 36 bytes to the inquiry-result buffer | |
699 | * and displaying garbage for the Vendor, Product, or Revision | |
700 | * strings. | |
701 | */ | |
702 | if (sdev->inquiry_len < 36) { | |
a35bb445 VK |
703 | if (!sdev->host->short_inquiry) { |
704 | shost_printk(KERN_INFO, sdev->host, | |
705 | "scsi scan: INQUIRY result too short (%d)," | |
706 | " using 36\n", sdev->inquiry_len); | |
707 | sdev->host->short_inquiry = 1; | |
708 | } | |
e423ee31 AS |
709 | sdev->inquiry_len = 36; |
710 | } | |
711 | ||
712 | /* | |
1da177e4 LT |
713 | * Related to the above issue: |
714 | * | |
715 | * XXX Devices (disk or all?) should be sent a TEST UNIT READY, | |
716 | * and if not ready, sent a START_STOP to start (maybe spin up) and | |
717 | * then send the INQUIRY again, since the INQUIRY can change after | |
718 | * a device is initialized. | |
719 | * | |
720 | * Ideally, start a device if explicitly asked to do so. This | |
721 | * assumes that a device is spun up on power on, spun down on | |
722 | * request, and then spun up on request. | |
723 | */ | |
724 | ||
725 | /* | |
726 | * The scanning code needs to know the scsi_level, even if no | |
727 | * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so | |
728 | * non-zero LUNs can be scanned. | |
729 | */ | |
730 | sdev->scsi_level = inq_result[2] & 0x07; | |
731 | if (sdev->scsi_level >= 2 || | |
732 | (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1)) | |
733 | sdev->scsi_level++; | |
6f3a2024 | 734 | sdev->sdev_target->scsi_level = sdev->scsi_level; |
1da177e4 | 735 | |
50c4e964 AS |
736 | /* |
737 | * If SCSI-2 or lower, and if the transport requires it, | |
738 | * store the LUN value in CDB[1]. | |
739 | */ | |
740 | sdev->lun_in_cdb = 0; | |
741 | if (sdev->scsi_level <= SCSI_2 && | |
742 | sdev->scsi_level != SCSI_UNKNOWN && | |
743 | !sdev->host->no_scsi2_lun_in_cdb) | |
744 | sdev->lun_in_cdb = 1; | |
745 | ||
39216033 | 746 | return 0; |
1da177e4 LT |
747 | } |
748 | ||
749 | /** | |
f64a181d | 750 | * scsi_add_lun - allocate and fully initialze a scsi_device |
6d877688 | 751 | * @sdev: holds information to be stored in the new scsi_device |
1da177e4 LT |
752 | * @inq_result: holds the result of a previous INQUIRY to the LUN |
753 | * @bflags: black/white list flag | |
6d877688 | 754 | * @async: 1 if this device is being scanned asynchronously |
1da177e4 LT |
755 | * |
756 | * Description: | |
6d877688 MW |
757 | * Initialize the scsi_device @sdev. Optionally set fields based |
758 | * on values in *@bflags. | |
1da177e4 LT |
759 | * |
760 | * Return: | |
f64a181d CH |
761 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device |
762 | * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized | |
1da177e4 | 763 | **/ |
e5b3cd42 | 764 | static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, |
093b8886 | 765 | blist_flags_t *bflags, int async) |
1da177e4 | 766 | { |
6f4267e3 JB |
767 | int ret; |
768 | ||
1da177e4 LT |
769 | /* |
770 | * XXX do not save the inquiry, since it can change underneath us, | |
771 | * save just vendor/model/rev. | |
772 | * | |
773 | * Rather than save it and have an ioctl that retrieves the saved | |
774 | * value, have an ioctl that executes the same INQUIRY code used | |
775 | * in scsi_probe_lun, let user level programs doing INQUIRY | |
776 | * scanning run at their own risk, or supply a user level program | |
777 | * that can correctly scan. | |
778 | */ | |
09123d23 AS |
779 | |
780 | /* | |
781 | * Copy at least 36 bytes of INQUIRY data, so that we don't | |
782 | * dereference unallocated memory when accessing the Vendor, | |
783 | * Product, and Revision strings. Badly behaved devices may set | |
784 | * the INQUIRY Additional Length byte to a small value, indicating | |
785 | * these strings are invalid, but often they contain plausible data | |
786 | * nonetheless. It doesn't matter if the device sent < 36 bytes | |
787 | * total, since scsi_probe_lun() initializes inq_result with 0s. | |
788 | */ | |
789 | sdev->inquiry = kmemdup(inq_result, | |
790 | max_t(size_t, sdev->inquiry_len, 36), | |
1749ef00 | 791 | GFP_KERNEL); |
09123d23 | 792 | if (sdev->inquiry == NULL) |
1da177e4 | 793 | return SCSI_SCAN_NO_RESPONSE; |
1da177e4 | 794 | |
1da177e4 LT |
795 | sdev->vendor = (char *) (sdev->inquiry + 8); |
796 | sdev->model = (char *) (sdev->inquiry + 16); | |
797 | sdev->rev = (char *) (sdev->inquiry + 32); | |
798 | ||
14216561 JB |
799 | if (strncmp(sdev->vendor, "ATA ", 8) == 0) { |
800 | /* | |
801 | * sata emulation layer device. This is a hack to work around | |
802 | * the SATL power management specifications which state that | |
803 | * when the SATL detects the device has gone into standby | |
804 | * mode, it shall respond with NOT READY. | |
805 | */ | |
806 | sdev->allow_restart = 1; | |
807 | } | |
808 | ||
1da177e4 | 809 | if (*bflags & BLIST_ISROM) { |
6d877688 MW |
810 | sdev->type = TYPE_ROM; |
811 | sdev->removable = 1; | |
812 | } else { | |
813 | sdev->type = (inq_result[0] & 0x1f); | |
814 | sdev->removable = (inq_result[1] & 0x80) >> 7; | |
45341ca3 SJ |
815 | |
816 | /* | |
817 | * some devices may respond with wrong type for | |
818 | * well-known logical units. Force well-known type | |
819 | * to enumerate them correctly. | |
820 | */ | |
821 | if (scsi_is_wlun(sdev->lun) && sdev->type != TYPE_WLUN) { | |
822 | sdev_printk(KERN_WARNING, sdev, | |
823 | "%s: correcting incorrect peripheral device type 0x%x for W-LUN 0x%16xhN\n", | |
824 | __func__, sdev->type, (unsigned int)sdev->lun); | |
825 | sdev->type = TYPE_WLUN; | |
826 | } | |
827 | ||
6d877688 | 828 | } |
1da177e4 | 829 | |
6d877688 MW |
830 | if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) { |
831 | /* RBC and MMC devices can return SCSI-3 compliance and yet | |
832 | * still not support REPORT LUNS, so make them act as | |
833 | * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is | |
834 | * specifically set */ | |
835 | if ((*bflags & BLIST_REPORTLUN2) == 0) | |
836 | *bflags |= BLIST_NOREPORTLUN; | |
837 | } | |
838 | ||
1da177e4 LT |
839 | /* |
840 | * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI | |
841 | * spec says: The device server is capable of supporting the | |
842 | * specified peripheral device type on this logical unit. However, | |
843 | * the physical device is not currently connected to this logical | |
844 | * unit. | |
845 | * | |
846 | * The above is vague, as it implies that we could treat 001 and | |
847 | * 011 the same. Stay compatible with previous code, and create a | |
f64a181d | 848 | * scsi_device for a PQ of 1 |
1da177e4 LT |
849 | * |
850 | * Don't set the device offline here; rather let the upper | |
851 | * level drivers eval the PQ to decide whether they should | |
852 | * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check. | |
853 | */ | |
854 | ||
855 | sdev->inq_periph_qual = (inq_result[0] >> 5) & 7; | |
1da177e4 LT |
856 | sdev->lockable = sdev->removable; |
857 | sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2); | |
858 | ||
6d877688 MW |
859 | if (sdev->scsi_level >= SCSI_3 || |
860 | (sdev->inquiry_len > 56 && inq_result[56] & 0x04)) | |
1da177e4 LT |
861 | sdev->ppr = 1; |
862 | if (inq_result[7] & 0x60) | |
863 | sdev->wdtr = 1; | |
864 | if (inq_result[7] & 0x10) | |
865 | sdev->sdtr = 1; | |
866 | ||
19ac0db3 | 867 | sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d " |
4ff36718 MW |
868 | "ANSI: %d%s\n", scsi_device_type(sdev->type), |
869 | sdev->vendor, sdev->model, sdev->rev, | |
870 | sdev->inq_periph_qual, inq_result[2] & 0x07, | |
871 | (inq_result[3] & 0x0f) == 1 ? " CCS" : ""); | |
872 | ||
1da177e4 | 873 | if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) && |
c8b09f6f | 874 | !(*bflags & BLIST_NOTQ)) { |
1da177e4 | 875 | sdev->tagged_supported = 1; |
c8b09f6f CH |
876 | sdev->simple_tags = 1; |
877 | } | |
6d877688 | 878 | |
1da177e4 LT |
879 | /* |
880 | * Some devices (Texel CD ROM drives) have handshaking problems | |
881 | * when used with the Seagate controllers. borken is initialized | |
882 | * to 1, and then set it to 0 here. | |
883 | */ | |
884 | if ((*bflags & BLIST_BORKEN) == 0) | |
885 | sdev->borken = 0; | |
886 | ||
6d877688 MW |
887 | if (*bflags & BLIST_NO_ULD_ATTACH) |
888 | sdev->no_uld_attach = 1; | |
889 | ||
1da177e4 LT |
890 | /* |
891 | * Apparently some really broken devices (contrary to the SCSI | |
892 | * standards) need to be selected without asserting ATN | |
893 | */ | |
894 | if (*bflags & BLIST_SELECT_NO_ATN) | |
895 | sdev->select_no_atn = 1; | |
896 | ||
4d7db04a JB |
897 | /* |
898 | * Maximum 512 sector transfer length | |
899 | * broken RA4x00 Compaq Disk Array | |
900 | */ | |
901 | if (*bflags & BLIST_MAX_512) | |
086fa5ff | 902 | blk_queue_max_hw_sectors(sdev->request_queue, 512); |
35e9a9f9 MC |
903 | /* |
904 | * Max 1024 sector transfer length for targets that report incorrect | |
905 | * max/optimal lengths and relied on the old block layer safe default | |
906 | */ | |
907 | else if (*bflags & BLIST_MAX_1024) | |
908 | blk_queue_max_hw_sectors(sdev->request_queue, 1024); | |
4d7db04a | 909 | |
1da177e4 LT |
910 | /* |
911 | * Some devices may not want to have a start command automatically | |
912 | * issued when a device is added. | |
913 | */ | |
914 | if (*bflags & BLIST_NOSTARTONADD) | |
915 | sdev->no_start_on_add = 1; | |
916 | ||
917 | if (*bflags & BLIST_SINGLELUN) | |
25d7c363 | 918 | scsi_target(sdev)->single_lun = 1; |
1da177e4 | 919 | |
1da177e4 LT |
920 | sdev->use_10_for_rw = 1; |
921 | ||
0213436a JD |
922 | /* some devices don't like REPORT SUPPORTED OPERATION CODES |
923 | * and will simply timeout causing sd_mod init to take a very | |
924 | * very long time */ | |
925 | if (*bflags & BLIST_NO_RSOC) | |
926 | sdev->no_report_opcodes = 1; | |
927 | ||
1da177e4 LT |
928 | /* set the device running here so that slave configure |
929 | * may do I/O */ | |
0db6ca8a | 930 | mutex_lock(&sdev->state_mutex); |
6f4267e3 | 931 | ret = scsi_device_set_state(sdev, SDEV_RUNNING); |
0db6ca8a | 932 | if (ret) |
6f4267e3 | 933 | ret = scsi_device_set_state(sdev, SDEV_BLOCK); |
0db6ca8a | 934 | mutex_unlock(&sdev->state_mutex); |
6f4267e3 | 935 | |
0db6ca8a BVA |
936 | if (ret) { |
937 | sdev_printk(KERN_ERR, sdev, | |
938 | "in wrong state %s to complete scan\n", | |
939 | scsi_device_state_name(sdev->sdev_state)); | |
940 | return SCSI_SCAN_NO_RESPONSE; | |
6f4267e3 | 941 | } |
1da177e4 | 942 | |
1da177e4 LT |
943 | if (*bflags & BLIST_NOT_LOCKABLE) |
944 | sdev->lockable = 0; | |
945 | ||
946 | if (*bflags & BLIST_RETRY_HWERROR) | |
947 | sdev->retry_hwerror = 1; | |
948 | ||
d974e426 MP |
949 | if (*bflags & BLIST_NO_DIF) |
950 | sdev->no_dif = 1; | |
951 | ||
28a0bc41 MP |
952 | if (*bflags & BLIST_UNMAP_LIMIT_WS) |
953 | sdev->unmap_limit_for_ws = 1; | |
954 | ||
0816c925 MP |
955 | sdev->eh_timeout = SCSI_DEFAULT_EH_TIMEOUT; |
956 | ||
c1d40a52 MP |
957 | if (*bflags & BLIST_TRY_VPD_PAGES) |
958 | sdev->try_vpd_pages = 1; | |
959 | else if (*bflags & BLIST_SKIP_VPD_PAGES) | |
56f2a801 MP |
960 | sdev->skip_vpd_pages = 1; |
961 | ||
1da177e4 LT |
962 | transport_configure_device(&sdev->sdev_gendev); |
963 | ||
93805091 | 964 | if (sdev->host->hostt->slave_configure) { |
6f4267e3 | 965 | ret = sdev->host->hostt->slave_configure(sdev); |
93805091 CH |
966 | if (ret) { |
967 | /* | |
968 | * if LLDD reports slave not present, don't clutter | |
969 | * console with alloc failure messages | |
970 | */ | |
971 | if (ret != -ENXIO) { | |
972 | sdev_printk(KERN_ERR, sdev, | |
973 | "failed to configure device\n"); | |
974 | } | |
975 | return SCSI_SCAN_NO_RESPONSE; | |
976 | } | |
977 | } | |
1da177e4 | 978 | |
b3ae8780 HR |
979 | if (sdev->scsi_level >= SCSI_3) |
980 | scsi_attach_vpd(sdev); | |
981 | ||
4a84067d | 982 | sdev->max_queue_depth = sdev->queue_depth; |
345e2960 | 983 | sdev->sdev_bflags = *bflags; |
4a84067d | 984 | |
1da177e4 LT |
985 | /* |
986 | * Ok, the device is now all set up, we can | |
987 | * register it and tell the rest of the kernel | |
988 | * about it. | |
989 | */ | |
3e082a91 | 990 | if (!async && scsi_sysfs_add_sdev(sdev) != 0) |
b24b1033 | 991 | return SCSI_SCAN_NO_RESPONSE; |
1da177e4 LT |
992 | |
993 | return SCSI_SCAN_LUN_PRESENT; | |
994 | } | |
995 | ||
c5f2e640 | 996 | #ifdef CONFIG_SCSI_LOGGING |
6c7154c9 | 997 | /** |
eb44820c | 998 | * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace |
6c7154c9 KG |
999 | * @buf: Output buffer with at least end-first+1 bytes of space |
1000 | * @inq: Inquiry buffer (input) | |
1001 | * @first: Offset of string into inq | |
1002 | * @end: Index after last character in inq | |
1003 | */ | |
c5f2e640 | 1004 | static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq, |
6c7154c9 KG |
1005 | unsigned first, unsigned end) |
1006 | { | |
1007 | unsigned term = 0, idx; | |
c5f2e640 | 1008 | |
1009 | for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) { | |
1010 | if (inq[idx+first] > ' ') { | |
6c7154c9 KG |
1011 | buf[idx] = inq[idx+first]; |
1012 | term = idx+1; | |
1013 | } else { | |
1014 | buf[idx] = ' '; | |
1015 | } | |
1016 | } | |
1017 | buf[term] = 0; | |
1018 | return buf; | |
1019 | } | |
c5f2e640 | 1020 | #endif |
6f3a2024 | 1021 | |
1da177e4 LT |
1022 | /** |
1023 | * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it | |
1024 | * @starget: pointer to target device structure | |
1025 | * @lun: LUN of target device | |
1da177e4 | 1026 | * @bflagsp: store bflags here if not NULL |
eb44820c | 1027 | * @sdevp: probe the LUN corresponding to this scsi_device |
1d645088 HR |
1028 | * @rescan: if not equal to SCSI_SCAN_INITIAL skip some code only |
1029 | * needed on first scan | |
eb44820c | 1030 | * @hostdata: passed to scsi_alloc_sdev() |
1da177e4 LT |
1031 | * |
1032 | * Description: | |
1033 | * Call scsi_probe_lun, if a LUN with an attached device is found, | |
1034 | * allocate and set it up by calling scsi_add_lun. | |
1035 | * | |
1036 | * Return: | |
739aca06 MCC |
1037 | * |
1038 | * - SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device | |
1039 | * - SCSI_SCAN_TARGET_PRESENT: target responded, but no device is | |
1da177e4 | 1040 | * attached at the LUN |
739aca06 | 1041 | * - SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized |
1da177e4 LT |
1042 | **/ |
1043 | static int scsi_probe_and_add_lun(struct scsi_target *starget, | |
093b8886 | 1044 | u64 lun, blist_flags_t *bflagsp, |
1d645088 HR |
1045 | struct scsi_device **sdevp, |
1046 | enum scsi_scan_mode rescan, | |
1da177e4 LT |
1047 | void *hostdata) |
1048 | { | |
1049 | struct scsi_device *sdev; | |
1da177e4 | 1050 | unsigned char *result; |
093b8886 BVA |
1051 | blist_flags_t bflags; |
1052 | int res = SCSI_SCAN_NO_RESPONSE, result_len = 256; | |
1da177e4 LT |
1053 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
1054 | ||
1055 | /* | |
1056 | * The rescan flag is used as an optimization, the first scan of a | |
1057 | * host adapter calls into here with rescan == 0. | |
1058 | */ | |
6f3a2024 JB |
1059 | sdev = scsi_device_lookup_by_target(starget, lun); |
1060 | if (sdev) { | |
1d645088 | 1061 | if (rescan != SCSI_SCAN_INITIAL || !scsi_device_created(sdev)) { |
91921e01 | 1062 | SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
1da177e4 | 1063 | "scsi scan: device exists on %s\n", |
71610f55 | 1064 | dev_name(&sdev->sdev_gendev))); |
1da177e4 LT |
1065 | if (sdevp) |
1066 | *sdevp = sdev; | |
1067 | else | |
1068 | scsi_device_put(sdev); | |
1069 | ||
1070 | if (bflagsp) | |
1071 | *bflagsp = scsi_get_device_flags(sdev, | |
1072 | sdev->vendor, | |
1073 | sdev->model); | |
1074 | return SCSI_SCAN_LUN_PRESENT; | |
1075 | } | |
6f3a2024 JB |
1076 | scsi_device_put(sdev); |
1077 | } else | |
1078 | sdev = scsi_alloc_sdev(starget, lun, hostdata); | |
1da177e4 LT |
1079 | if (!sdev) |
1080 | goto out; | |
39216033 | 1081 | |
1749ef00 | 1082 | result = kmalloc(result_len, GFP_KERNEL | |
bc86120a | 1083 | ((shost->unchecked_isa_dma) ? __GFP_DMA : 0)); |
1da177e4 | 1084 | if (!result) |
39216033 | 1085 | goto out_free_sdev; |
1da177e4 | 1086 | |
39216033 | 1087 | if (scsi_probe_lun(sdev, result, result_len, &bflags)) |
1da177e4 LT |
1088 | goto out_free_result; |
1089 | ||
4186ab19 KG |
1090 | if (bflagsp) |
1091 | *bflagsp = bflags; | |
1da177e4 LT |
1092 | /* |
1093 | * result contains valid SCSI INQUIRY data. | |
1094 | */ | |
496c91bb | 1095 | if ((result[0] >> 5) == 3) { |
1da177e4 LT |
1096 | /* |
1097 | * For a Peripheral qualifier 3 (011b), the SCSI | |
1098 | * spec says: The device server is not capable of | |
1099 | * supporting a physical device on this logical | |
1100 | * unit. | |
1101 | * | |
1102 | * For disks, this implies that there is no | |
1103 | * logical disk configured at sdev->lun, but there | |
1104 | * is a target id responding. | |
1105 | */ | |
6c7154c9 KG |
1106 | SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:" |
1107 | " peripheral qualifier of 3, device not" | |
1108 | " added\n")) | |
1109 | if (lun == 0) { | |
c5f2e640 | 1110 | SCSI_LOG_SCAN_BUS(1, { |
1111 | unsigned char vend[9]; | |
1112 | unsigned char mod[17]; | |
1113 | ||
1114 | sdev_printk(KERN_INFO, sdev, | |
6c7154c9 | 1115 | "scsi scan: consider passing scsi_mod." |
3424a65d | 1116 | "dev_flags=%s:%s:0x240 or 0x1000240\n", |
6c7154c9 | 1117 | scsi_inq_str(vend, result, 8, 16), |
c5f2e640 | 1118 | scsi_inq_str(mod, result, 16, 32)); |
1119 | }); | |
643eb2d9 | 1120 | |
6c7154c9 | 1121 | } |
643eb2d9 | 1122 | |
1da177e4 LT |
1123 | res = SCSI_SCAN_TARGET_PRESENT; |
1124 | goto out_free_result; | |
1125 | } | |
1126 | ||
1bfc5d9d | 1127 | /* |
84961f28 | 1128 | * Some targets may set slight variations of PQ and PDT to signal |
1129 | * that no LUN is present, so don't add sdev in these cases. | |
1130 | * Two specific examples are: | |
1131 | * 1) NetApp targets: return PQ=1, PDT=0x1f | |
948e922f LZ |
1132 | * 2) IBM/2145 targets: return PQ=1, PDT=0 |
1133 | * 3) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved" | |
84961f28 | 1134 | * in the UFI 1.0 spec (we cannot rely on reserved bits). |
1135 | * | |
1136 | * References: | |
1137 | * 1) SCSI SPC-3, pp. 145-146 | |
1138 | * PQ=1: "A peripheral device having the specified peripheral | |
1139 | * device type is not connected to this logical unit. However, the | |
1140 | * device server is capable of supporting the specified peripheral | |
1141 | * device type on this logical unit." | |
1142 | * PDT=0x1f: "Unknown or no device type" | |
1143 | * 2) USB UFI 1.0, p. 20 | |
1144 | * PDT=00h Direct-access device (floppy) | |
1145 | * PDT=1Fh none (no FDD connected to the requested logical unit) | |
1bfc5d9d | 1146 | */ |
948e922f LZ |
1147 | if (((result[0] >> 5) == 1 || |
1148 | (starget->pdt_1f_for_no_lun && (result[0] & 0x1f) == 0x1f)) && | |
01b291bd | 1149 | !scsi_is_wlun(lun)) { |
91921e01 | 1150 | SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
1bfc5d9d AS |
1151 | "scsi scan: peripheral device type" |
1152 | " of 31, no device added\n")); | |
1153 | res = SCSI_SCAN_TARGET_PRESENT; | |
1154 | goto out_free_result; | |
1155 | } | |
1156 | ||
3e082a91 | 1157 | res = scsi_add_lun(sdev, result, &bflags, shost->async_scan); |
1da177e4 LT |
1158 | if (res == SCSI_SCAN_LUN_PRESENT) { |
1159 | if (bflags & BLIST_KEY) { | |
1160 | sdev->lockable = 0; | |
39216033 | 1161 | scsi_unlock_floptical(sdev, result); |
1da177e4 | 1162 | } |
1da177e4 LT |
1163 | } |
1164 | ||
1165 | out_free_result: | |
1166 | kfree(result); | |
1da177e4 LT |
1167 | out_free_sdev: |
1168 | if (res == SCSI_SCAN_LUN_PRESENT) { | |
1169 | if (sdevp) { | |
b70d37bf AS |
1170 | if (scsi_device_get(sdev) == 0) { |
1171 | *sdevp = sdev; | |
1172 | } else { | |
1173 | __scsi_remove_device(sdev); | |
1174 | res = SCSI_SCAN_NO_RESPONSE; | |
1175 | } | |
1da177e4 | 1176 | } |
6f3a2024 | 1177 | } else |
860dc736 | 1178 | __scsi_remove_device(sdev); |
1da177e4 LT |
1179 | out: |
1180 | return res; | |
1181 | } | |
1182 | ||
1183 | /** | |
1184 | * scsi_sequential_lun_scan - sequentially scan a SCSI target | |
1185 | * @starget: pointer to target structure to scan | |
1186 | * @bflags: black/white list flag for LUN 0 | |
eb44820c RL |
1187 | * @scsi_level: Which version of the standard does this device adhere to |
1188 | * @rescan: passed to scsi_probe_add_lun() | |
1da177e4 LT |
1189 | * |
1190 | * Description: | |
1191 | * Generally, scan from LUN 1 (LUN 0 is assumed to already have been | |
1192 | * scanned) to some maximum lun until a LUN is found with no device | |
1193 | * attached. Use the bflags to figure out any oddities. | |
1194 | * | |
1195 | * Modifies sdevscan->lun. | |
1196 | **/ | |
1197 | static void scsi_sequential_lun_scan(struct scsi_target *starget, | |
093b8886 | 1198 | blist_flags_t bflags, int scsi_level, |
1d645088 | 1199 | enum scsi_scan_mode rescan) |
1da177e4 | 1200 | { |
9cb78c16 HR |
1201 | uint max_dev_lun; |
1202 | u64 sparse_lun, lun; | |
1da177e4 LT |
1203 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
1204 | ||
91921e01 HR |
1205 | SCSI_LOG_SCAN_BUS(3, starget_printk(KERN_INFO, starget, |
1206 | "scsi scan: Sequential scan\n")); | |
1da177e4 LT |
1207 | |
1208 | max_dev_lun = min(max_scsi_luns, shost->max_lun); | |
1209 | /* | |
1210 | * If this device is known to support sparse multiple units, | |
1211 | * override the other settings, and scan all of them. Normally, | |
1212 | * SCSI-3 devices should be scanned via the REPORT LUNS. | |
1213 | */ | |
1214 | if (bflags & BLIST_SPARSELUN) { | |
1215 | max_dev_lun = shost->max_lun; | |
1216 | sparse_lun = 1; | |
1217 | } else | |
1218 | sparse_lun = 0; | |
1219 | ||
1da177e4 | 1220 | /* |
fb0d82f4 | 1221 | * If less than SCSI_1_CCS, and no special lun scanning, stop |
1da177e4 | 1222 | * scanning; this matches 2.4 behaviour, but could just be a bug |
fb0d82f4 | 1223 | * (to continue scanning a SCSI_1_CCS device). |
1da177e4 LT |
1224 | * |
1225 | * This test is broken. We might not have any device on lun0 for | |
1226 | * a sparselun device, and if that's the case then how would we | |
1227 | * know the real scsi_level, eh? It might make sense to just not | |
1228 | * scan any SCSI_1 device for non-0 luns, but that check would best | |
1229 | * go into scsi_alloc_sdev() and just have it return null when asked | |
1230 | * to alloc an sdev for lun > 0 on an already found SCSI_1 device. | |
1231 | * | |
1232 | if ((sdevscan->scsi_level < SCSI_1_CCS) && | |
1233 | ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN)) | |
1234 | == 0)) | |
1235 | return; | |
1236 | */ | |
1237 | /* | |
1238 | * If this device is known to support multiple units, override | |
1239 | * the other settings, and scan all of them. | |
1240 | */ | |
1241 | if (bflags & BLIST_FORCELUN) | |
1242 | max_dev_lun = shost->max_lun; | |
1243 | /* | |
1244 | * REGAL CDC-4X: avoid hang after LUN 4 | |
1245 | */ | |
1246 | if (bflags & BLIST_MAX5LUN) | |
1247 | max_dev_lun = min(5U, max_dev_lun); | |
1248 | /* | |
1249 | * Do not scan SCSI-2 or lower device past LUN 7, unless | |
1250 | * BLIST_LARGELUN. | |
1251 | */ | |
1252 | if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN)) | |
1253 | max_dev_lun = min(8U, max_dev_lun); | |
496c91bb | 1254 | else |
22ffeb48 HR |
1255 | max_dev_lun = min(256U, max_dev_lun); |
1256 | ||
1da177e4 LT |
1257 | /* |
1258 | * We have already scanned LUN 0, so start at LUN 1. Keep scanning | |
1259 | * until we reach the max, or no LUN is found and we are not | |
1260 | * sparse_lun. | |
1261 | */ | |
1262 | for (lun = 1; lun < max_dev_lun; ++lun) | |
1263 | if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, | |
1264 | NULL) != SCSI_SCAN_LUN_PRESENT) && | |
1265 | !sparse_lun) | |
1266 | return; | |
1267 | } | |
1268 | ||
1da177e4 LT |
1269 | /** |
1270 | * scsi_report_lun_scan - Scan using SCSI REPORT LUN results | |
eb44820c RL |
1271 | * @starget: which target |
1272 | * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN | |
1273 | * @rescan: nonzero if we can skip code only needed on first scan | |
1da177e4 LT |
1274 | * |
1275 | * Description: | |
eb44820c RL |
1276 | * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command. |
1277 | * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun. | |
1da177e4 | 1278 | * |
eb44820c RL |
1279 | * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8 |
1280 | * LUNs even if it's older than SCSI-3. | |
1281 | * If BLIST_NOREPORTLUN is set, return 1 always. | |
1282 | * If BLIST_NOLUN is set, return 0 always. | |
09b6b51b | 1283 | * If starget->no_report_luns is set, return 1 always. |
1da177e4 LT |
1284 | * |
1285 | * Return: | |
1286 | * 0: scan completed (or no memory, so further scanning is futile) | |
eb44820c | 1287 | * 1: could not scan with REPORT LUN |
1da177e4 | 1288 | **/ |
093b8886 | 1289 | static int scsi_report_lun_scan(struct scsi_target *starget, blist_flags_t bflags, |
1d645088 | 1290 | enum scsi_scan_mode rescan) |
1da177e4 | 1291 | { |
1da177e4 LT |
1292 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
1293 | unsigned int length; | |
9cb78c16 | 1294 | u64 lun; |
1da177e4 LT |
1295 | unsigned int num_luns; |
1296 | unsigned int retries; | |
39216033 | 1297 | int result; |
1da177e4 | 1298 | struct scsi_lun *lunp, *lun_data; |
1da177e4 | 1299 | struct scsi_sense_hdr sshdr; |
6f3a2024 JB |
1300 | struct scsi_device *sdev; |
1301 | struct Scsi_Host *shost = dev_to_shost(&starget->dev); | |
2ef89198 | 1302 | int ret = 0; |
1da177e4 LT |
1303 | |
1304 | /* | |
1305 | * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set. | |
1306 | * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does | |
1307 | * support more than 8 LUNs. | |
09b6b51b | 1308 | * Don't attempt if the target doesn't support REPORT LUNS. |
1da177e4 | 1309 | */ |
4d7db04a JB |
1310 | if (bflags & BLIST_NOREPORTLUN) |
1311 | return 1; | |
1312 | if (starget->scsi_level < SCSI_2 && | |
1313 | starget->scsi_level != SCSI_UNKNOWN) | |
1314 | return 1; | |
1315 | if (starget->scsi_level < SCSI_3 && | |
1316 | (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) | |
1da177e4 LT |
1317 | return 1; |
1318 | if (bflags & BLIST_NOLUN) | |
1319 | return 0; | |
09b6b51b AS |
1320 | if (starget->no_report_luns) |
1321 | return 1; | |
1da177e4 | 1322 | |
6f3a2024 JB |
1323 | if (!(sdev = scsi_device_lookup_by_target(starget, 0))) { |
1324 | sdev = scsi_alloc_sdev(starget, 0, NULL); | |
1325 | if (!sdev) | |
1326 | return 0; | |
75f8ee8e AS |
1327 | if (scsi_device_get(sdev)) { |
1328 | __scsi_remove_device(sdev); | |
6f3a2024 | 1329 | return 0; |
75f8ee8e | 1330 | } |
6f3a2024 JB |
1331 | } |
1332 | ||
1da177e4 LT |
1333 | /* |
1334 | * Allocate enough to hold the header (the same size as one scsi_lun) | |
acd6d738 RE |
1335 | * plus the number of luns we are requesting. 511 was the default |
1336 | * value of the now removed max_report_luns parameter. | |
1da177e4 | 1337 | */ |
acd6d738 RE |
1338 | length = (511 + 1) * sizeof(struct scsi_lun); |
1339 | retry: | |
eb9eea01 | 1340 | lun_data = kmalloc(length, GFP_KERNEL | |
1da177e4 | 1341 | (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0)); |
6f3a2024 | 1342 | if (!lun_data) { |
cadbd4a5 | 1343 | printk(ALLOC_FAILURE_MSG, __func__); |
39216033 | 1344 | goto out; |
6f3a2024 | 1345 | } |
1da177e4 LT |
1346 | |
1347 | scsi_cmd[0] = REPORT_LUNS; | |
1348 | ||
1349 | /* | |
1350 | * bytes 1 - 5: reserved, set to zero. | |
1351 | */ | |
1352 | memset(&scsi_cmd[1], 0, 5); | |
1353 | ||
1354 | /* | |
1355 | * bytes 6 - 9: length of the command. | |
1356 | */ | |
2a904e5d | 1357 | put_unaligned_be32(length, &scsi_cmd[6]); |
1da177e4 LT |
1358 | |
1359 | scsi_cmd[10] = 0; /* reserved */ | |
1360 | scsi_cmd[11] = 0; /* control */ | |
1da177e4 LT |
1361 | |
1362 | /* | |
1363 | * We can get a UNIT ATTENTION, for example a power on/reset, so | |
1364 | * retry a few times (like sd.c does for TEST UNIT READY). | |
1365 | * Experience shows some combinations of adapter/devices get at | |
1366 | * least two power on/resets. | |
1367 | * | |
1368 | * Illegal requests (for devices that do not support REPORT LUNS) | |
1369 | * should come through as a check condition, and will not generate | |
1370 | * a retry. | |
1371 | */ | |
1372 | for (retries = 0; retries < 3; retries++) { | |
91921e01 HR |
1373 | SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, |
1374 | "scsi scan: Sending REPORT LUNS to (try %d)\n", | |
1da177e4 | 1375 | retries)); |
39216033 | 1376 | |
39216033 | 1377 | result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, |
ea73a9f2 | 1378 | lun_data, length, &sshdr, |
b39c9a66 | 1379 | SCSI_REPORT_LUNS_TIMEOUT, 3, NULL); |
39216033 | 1380 | |
91921e01 HR |
1381 | SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, |
1382 | "scsi scan: REPORT LUNS" | |
1383 | " %s (try %d) result 0x%x\n", | |
1384 | result ? "failed" : "successful", | |
1385 | retries, result)); | |
39216033 | 1386 | if (result == 0) |
1da177e4 | 1387 | break; |
ea73a9f2 | 1388 | else if (scsi_sense_valid(&sshdr)) { |
1da177e4 LT |
1389 | if (sshdr.sense_key != UNIT_ATTENTION) |
1390 | break; | |
1391 | } | |
1392 | } | |
1393 | ||
39216033 | 1394 | if (result) { |
1da177e4 LT |
1395 | /* |
1396 | * The device probably does not support a REPORT LUN command | |
1397 | */ | |
2ef89198 AS |
1398 | ret = 1; |
1399 | goto out_err; | |
1da177e4 | 1400 | } |
1da177e4 LT |
1401 | |
1402 | /* | |
1403 | * Get the length from the first four bytes of lun_data. | |
1404 | */ | |
acd6d738 RE |
1405 | if (get_unaligned_be32(lun_data->scsi_lun) + |
1406 | sizeof(struct scsi_lun) > length) { | |
1407 | length = get_unaligned_be32(lun_data->scsi_lun) + | |
1408 | sizeof(struct scsi_lun); | |
1409 | kfree(lun_data); | |
1410 | goto retry; | |
1411 | } | |
2a904e5d | 1412 | length = get_unaligned_be32(lun_data->scsi_lun); |
1da177e4 LT |
1413 | |
1414 | num_luns = (length / sizeof(struct scsi_lun)); | |
1da177e4 | 1415 | |
3bf743e7 JG |
1416 | SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, |
1417 | "scsi scan: REPORT LUN scan\n")); | |
1da177e4 LT |
1418 | |
1419 | /* | |
1420 | * Scan the luns in lun_data. The entry at offset 0 is really | |
1421 | * the header, so start at 1 and go up to and including num_luns. | |
1422 | */ | |
1423 | for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) { | |
1424 | lun = scsilun_to_int(lunp); | |
1425 | ||
9cb78c16 | 1426 | if (lun > sdev->host->max_lun) { |
91921e01 HR |
1427 | sdev_printk(KERN_WARNING, sdev, |
1428 | "lun%llu has a LUN larger than" | |
1429 | " allowed by the host adapter\n", lun); | |
1da177e4 LT |
1430 | } else { |
1431 | int res; | |
1432 | ||
1433 | res = scsi_probe_and_add_lun(starget, | |
1434 | lun, NULL, NULL, rescan, NULL); | |
1435 | if (res == SCSI_SCAN_NO_RESPONSE) { | |
1436 | /* | |
1437 | * Got some results, but now none, abort. | |
1438 | */ | |
3bf743e7 JG |
1439 | sdev_printk(KERN_ERR, sdev, |
1440 | "Unexpected response" | |
9cb78c16 HR |
1441 | " from lun %llu while scanning, scan" |
1442 | " aborted\n", (unsigned long long)lun); | |
1da177e4 LT |
1443 | break; |
1444 | } | |
1445 | } | |
1446 | } | |
1447 | ||
2ef89198 | 1448 | out_err: |
1da177e4 | 1449 | kfree(lun_data); |
1da177e4 | 1450 | out: |
0f1d87a2 | 1451 | if (scsi_device_created(sdev)) |
6f3a2024 JB |
1452 | /* |
1453 | * the sdev we used didn't appear in the report luns scan | |
1454 | */ | |
860dc736 | 1455 | __scsi_remove_device(sdev); |
bcd8f2e9 | 1456 | scsi_device_put(sdev); |
2ef89198 | 1457 | return ret; |
1da177e4 LT |
1458 | } |
1459 | ||
1460 | struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel, | |
9cb78c16 | 1461 | uint id, u64 lun, void *hostdata) |
1da177e4 | 1462 | { |
a97a83a0 | 1463 | struct scsi_device *sdev = ERR_PTR(-ENODEV); |
1da177e4 | 1464 | struct device *parent = &shost->shost_gendev; |
e02f3f59 | 1465 | struct scsi_target *starget; |
1da177e4 | 1466 | |
938e2ac0 MW |
1467 | if (strncmp(scsi_scan_type, "none", 4) == 0) |
1468 | return ERR_PTR(-ENODEV); | |
1469 | ||
e02f3f59 | 1470 | starget = scsi_alloc_target(parent, channel, id); |
1da177e4 LT |
1471 | if (!starget) |
1472 | return ERR_PTR(-ENOMEM); | |
bc4f2401 | 1473 | scsi_autopm_get_target(starget); |
1da177e4 | 1474 | |
0b950672 | 1475 | mutex_lock(&shost->scan_mutex); |
6b7f123f MW |
1476 | if (!shost->async_scan) |
1477 | scsi_complete_async_scans(); | |
1478 | ||
bc4f2401 | 1479 | if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) { |
a97a83a0 | 1480 | scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata); |
bc4f2401 AS |
1481 | scsi_autopm_put_host(shost); |
1482 | } | |
0b950672 | 1483 | mutex_unlock(&shost->scan_mutex); |
bc4f2401 | 1484 | scsi_autopm_put_target(starget); |
e63ed0d7 JB |
1485 | /* |
1486 | * paired with scsi_alloc_target(). Target will be destroyed unless | |
1487 | * scsi_probe_and_add_lun made an underlying device visible | |
1488 | */ | |
1da177e4 LT |
1489 | scsi_target_reap(starget); |
1490 | put_device(&starget->dev); | |
1491 | ||
1492 | return sdev; | |
1493 | } | |
1494 | EXPORT_SYMBOL(__scsi_add_device); | |
1495 | ||
146f7262 | 1496 | int scsi_add_device(struct Scsi_Host *host, uint channel, |
9cb78c16 | 1497 | uint target, u64 lun) |
146f7262 JB |
1498 | { |
1499 | struct scsi_device *sdev = | |
1500 | __scsi_add_device(host, channel, target, lun, NULL); | |
1501 | if (IS_ERR(sdev)) | |
1502 | return PTR_ERR(sdev); | |
1503 | ||
1504 | scsi_device_put(sdev); | |
1505 | return 0; | |
1506 | } | |
1507 | EXPORT_SYMBOL(scsi_add_device); | |
1508 | ||
1da177e4 LT |
1509 | void scsi_rescan_device(struct device *dev) |
1510 | { | |
d3d32891 HR |
1511 | struct scsi_device *sdev = to_scsi_device(dev); |
1512 | ||
e27829dc | 1513 | device_lock(dev); |
09e2b0b1 | 1514 | |
d3d32891 HR |
1515 | scsi_attach_vpd(sdev); |
1516 | ||
1517 | if (sdev->handler && sdev->handler->rescan) | |
1518 | sdev->handler->rescan(sdev); | |
09e2b0b1 | 1519 | |
e27829dc | 1520 | if (dev->driver && try_module_get(dev->driver->owner)) { |
3af6b352 CH |
1521 | struct scsi_driver *drv = to_scsi_driver(dev->driver); |
1522 | ||
1da177e4 LT |
1523 | if (drv->rescan) |
1524 | drv->rescan(dev); | |
3af6b352 | 1525 | module_put(dev->driver->owner); |
1da177e4 | 1526 | } |
e27829dc | 1527 | device_unlock(dev); |
1da177e4 LT |
1528 | } |
1529 | EXPORT_SYMBOL(scsi_rescan_device); | |
1530 | ||
e517d313 | 1531 | static void __scsi_scan_target(struct device *parent, unsigned int channel, |
1d645088 | 1532 | unsigned int id, u64 lun, enum scsi_scan_mode rescan) |
1da177e4 LT |
1533 | { |
1534 | struct Scsi_Host *shost = dev_to_shost(parent); | |
093b8886 | 1535 | blist_flags_t bflags = 0; |
1da177e4 | 1536 | int res; |
1da177e4 LT |
1537 | struct scsi_target *starget; |
1538 | ||
1539 | if (shost->this_id == id) | |
1540 | /* | |
1541 | * Don't scan the host adapter | |
1542 | */ | |
1543 | return; | |
1544 | ||
1da177e4 | 1545 | starget = scsi_alloc_target(parent, channel, id); |
1da177e4 LT |
1546 | if (!starget) |
1547 | return; | |
bc4f2401 | 1548 | scsi_autopm_get_target(starget); |
1da177e4 | 1549 | |
1da177e4 LT |
1550 | if (lun != SCAN_WILD_CARD) { |
1551 | /* | |
1552 | * Scan for a specific host/chan/id/lun. | |
1553 | */ | |
1554 | scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL); | |
1555 | goto out_reap; | |
1556 | } | |
1557 | ||
1558 | /* | |
1559 | * Scan LUN 0, if there is some response, scan further. Ideally, we | |
1560 | * would not configure LUN 0 until all LUNs are scanned. | |
1561 | */ | |
6f3a2024 JB |
1562 | res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL); |
1563 | if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) { | |
1564 | if (scsi_report_lun_scan(starget, bflags, rescan) != 0) | |
1da177e4 LT |
1565 | /* |
1566 | * The REPORT LUN did not scan the target, | |
1567 | * do a sequential scan. | |
1568 | */ | |
1569 | scsi_sequential_lun_scan(starget, bflags, | |
4186ab19 | 1570 | starget->scsi_level, rescan); |
1da177e4 | 1571 | } |
1da177e4 LT |
1572 | |
1573 | out_reap: | |
bc4f2401 | 1574 | scsi_autopm_put_target(starget); |
e63ed0d7 JB |
1575 | /* |
1576 | * paired with scsi_alloc_target(): determine if the target has | |
1577 | * any children at all and if not, nuke it | |
1578 | */ | |
1da177e4 LT |
1579 | scsi_target_reap(starget); |
1580 | ||
1581 | put_device(&starget->dev); | |
1582 | } | |
e517d313 AS |
1583 | |
1584 | /** | |
e59e4a09 | 1585 | * scsi_scan_target - scan a target id, possibly including all LUNs on the target. |
e517d313 AS |
1586 | * @parent: host to scan |
1587 | * @channel: channel to scan | |
1588 | * @id: target id to scan | |
1589 | * @lun: Specific LUN to scan or SCAN_WILD_CARD | |
1d645088 HR |
1590 | * @rescan: passed to LUN scanning routines; SCSI_SCAN_INITIAL for |
1591 | * no rescan, SCSI_SCAN_RESCAN to rescan existing LUNs, | |
1592 | * and SCSI_SCAN_MANUAL to force scanning even if | |
1593 | * 'scan=manual' is set. | |
e517d313 AS |
1594 | * |
1595 | * Description: | |
1596 | * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0, | |
1597 | * and possibly all LUNs on the target id. | |
1598 | * | |
1599 | * First try a REPORT LUN scan, if that does not scan the target, do a | |
1600 | * sequential scan of LUNs on the target id. | |
1601 | **/ | |
1602 | void scsi_scan_target(struct device *parent, unsigned int channel, | |
1d645088 | 1603 | unsigned int id, u64 lun, enum scsi_scan_mode rescan) |
e517d313 AS |
1604 | { |
1605 | struct Scsi_Host *shost = dev_to_shost(parent); | |
1606 | ||
93b45af5 MW |
1607 | if (strncmp(scsi_scan_type, "none", 4) == 0) |
1608 | return; | |
1609 | ||
1d645088 HR |
1610 | if (rescan != SCSI_SCAN_MANUAL && |
1611 | strncmp(scsi_scan_type, "manual", 6) == 0) | |
1612 | return; | |
1613 | ||
6b7f123f | 1614 | mutex_lock(&shost->scan_mutex); |
3e082a91 MW |
1615 | if (!shost->async_scan) |
1616 | scsi_complete_async_scans(); | |
1617 | ||
bc4f2401 | 1618 | if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) { |
e517d313 | 1619 | __scsi_scan_target(parent, channel, id, lun, rescan); |
bc4f2401 AS |
1620 | scsi_autopm_put_host(shost); |
1621 | } | |
0b950672 | 1622 | mutex_unlock(&shost->scan_mutex); |
e517d313 | 1623 | } |
1da177e4 LT |
1624 | EXPORT_SYMBOL(scsi_scan_target); |
1625 | ||
1626 | static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel, | |
1d645088 HR |
1627 | unsigned int id, u64 lun, |
1628 | enum scsi_scan_mode rescan) | |
1da177e4 LT |
1629 | { |
1630 | uint order_id; | |
1631 | ||
1632 | if (id == SCAN_WILD_CARD) | |
1633 | for (id = 0; id < shost->max_id; ++id) { | |
1634 | /* | |
1635 | * XXX adapter drivers when possible (FCP, iSCSI) | |
1636 | * could modify max_id to match the current max, | |
1637 | * not the absolute max. | |
1638 | * | |
1639 | * XXX add a shost id iterator, so for example, | |
1640 | * the FC ID can be the same as a target id | |
1641 | * without a huge overhead of sparse id's. | |
1642 | */ | |
1643 | if (shost->reverse_ordering) | |
1644 | /* | |
1645 | * Scan from high to low id. | |
1646 | */ | |
1647 | order_id = shost->max_id - id - 1; | |
1648 | else | |
1649 | order_id = id; | |
e517d313 AS |
1650 | __scsi_scan_target(&shost->shost_gendev, channel, |
1651 | order_id, lun, rescan); | |
1da177e4 LT |
1652 | } |
1653 | else | |
e517d313 AS |
1654 | __scsi_scan_target(&shost->shost_gendev, channel, |
1655 | id, lun, rescan); | |
1da177e4 LT |
1656 | } |
1657 | ||
1658 | int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel, | |
1d645088 HR |
1659 | unsigned int id, u64 lun, |
1660 | enum scsi_scan_mode rescan) | |
1da177e4 | 1661 | { |
3bf743e7 | 1662 | SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost, |
9cb78c16 | 1663 | "%s: <%u:%u:%llu>\n", |
cadbd4a5 | 1664 | __func__, channel, id, lun)); |
1da177e4 LT |
1665 | |
1666 | if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) || | |
091686d3 | 1667 | ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) || |
605c6dbe | 1668 | ((lun != SCAN_WILD_CARD) && (lun >= shost->max_lun))) |
1da177e4 LT |
1669 | return -EINVAL; |
1670 | ||
0b950672 | 1671 | mutex_lock(&shost->scan_mutex); |
6b7f123f MW |
1672 | if (!shost->async_scan) |
1673 | scsi_complete_async_scans(); | |
1674 | ||
bc4f2401 | 1675 | if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) { |
82f29467 MA |
1676 | if (channel == SCAN_WILD_CARD) |
1677 | for (channel = 0; channel <= shost->max_channel; | |
1678 | channel++) | |
1679 | scsi_scan_channel(shost, channel, id, lun, | |
1680 | rescan); | |
1681 | else | |
1da177e4 | 1682 | scsi_scan_channel(shost, channel, id, lun, rescan); |
bc4f2401 | 1683 | scsi_autopm_put_host(shost); |
82f29467 | 1684 | } |
0b950672 | 1685 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
1686 | |
1687 | return 0; | |
1688 | } | |
1689 | ||
3e082a91 MW |
1690 | static void scsi_sysfs_add_devices(struct Scsi_Host *shost) |
1691 | { | |
1692 | struct scsi_device *sdev; | |
1693 | shost_for_each_device(sdev, shost) { | |
3b661a92 DW |
1694 | /* target removed before the device could be added */ |
1695 | if (sdev->sdev_state == SDEV_DEL) | |
1696 | continue; | |
693ad5ba SJ |
1697 | /* If device is already visible, skip adding it to sysfs */ |
1698 | if (sdev->is_visible) | |
1699 | continue; | |
6b7f123f MW |
1700 | if (!scsi_host_scan_allowed(shost) || |
1701 | scsi_sysfs_add_sdev(sdev) != 0) | |
860dc736 | 1702 | __scsi_remove_device(sdev); |
3e082a91 MW |
1703 | } |
1704 | } | |
1705 | ||
1706 | /** | |
1707 | * scsi_prep_async_scan - prepare for an async scan | |
1708 | * @shost: the host which will be scanned | |
1709 | * Returns: a cookie to be passed to scsi_finish_async_scan() | |
1710 | * | |
1711 | * Tells the midlayer this host is going to do an asynchronous scan. | |
1712 | * It reserves the host's position in the scanning list and ensures | |
1713 | * that other asynchronous scans started after this one won't affect the | |
1714 | * ordering of the discovered devices. | |
1715 | */ | |
1aa8fab2 | 1716 | static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost) |
3e082a91 MW |
1717 | { |
1718 | struct async_scan_data *data; | |
6b7f123f | 1719 | unsigned long flags; |
3e082a91 MW |
1720 | |
1721 | if (strncmp(scsi_scan_type, "sync", 4) == 0) | |
1722 | return NULL; | |
1723 | ||
1724 | if (shost->async_scan) { | |
a4cf30e1 | 1725 | shost_printk(KERN_DEBUG, shost, "%s called twice\n", __func__); |
3e082a91 MW |
1726 | return NULL; |
1727 | } | |
1728 | ||
1729 | data = kmalloc(sizeof(*data), GFP_KERNEL); | |
1730 | if (!data) | |
1731 | goto err; | |
1732 | data->shost = scsi_host_get(shost); | |
1733 | if (!data->shost) | |
1734 | goto err; | |
1735 | init_completion(&data->prev_finished); | |
1736 | ||
6b7f123f MW |
1737 | mutex_lock(&shost->scan_mutex); |
1738 | spin_lock_irqsave(shost->host_lock, flags); | |
3e082a91 | 1739 | shost->async_scan = 1; |
6b7f123f MW |
1740 | spin_unlock_irqrestore(shost->host_lock, flags); |
1741 | mutex_unlock(&shost->scan_mutex); | |
1742 | ||
1743 | spin_lock(&async_scan_lock); | |
3e082a91 MW |
1744 | if (list_empty(&scanning_hosts)) |
1745 | complete(&data->prev_finished); | |
1746 | list_add_tail(&data->list, &scanning_hosts); | |
1747 | spin_unlock(&async_scan_lock); | |
1748 | ||
1749 | return data; | |
1750 | ||
1751 | err: | |
1752 | kfree(data); | |
1753 | return NULL; | |
1754 | } | |
1755 | ||
1756 | /** | |
1757 | * scsi_finish_async_scan - asynchronous scan has finished | |
1758 | * @data: cookie returned from earlier call to scsi_prep_async_scan() | |
1759 | * | |
1760 | * All the devices currently attached to this host have been found. | |
1761 | * This function announces all the devices it has found to the rest | |
1762 | * of the system. | |
1763 | */ | |
1aa8fab2 | 1764 | static void scsi_finish_async_scan(struct async_scan_data *data) |
3e082a91 MW |
1765 | { |
1766 | struct Scsi_Host *shost; | |
6b7f123f | 1767 | unsigned long flags; |
3e082a91 MW |
1768 | |
1769 | if (!data) | |
1770 | return; | |
1771 | ||
1772 | shost = data->shost; | |
6b7f123f MW |
1773 | |
1774 | mutex_lock(&shost->scan_mutex); | |
1775 | ||
3e082a91 | 1776 | if (!shost->async_scan) { |
91921e01 | 1777 | shost_printk(KERN_INFO, shost, "%s called twice\n", __func__); |
3e082a91 | 1778 | dump_stack(); |
773e82f6 | 1779 | mutex_unlock(&shost->scan_mutex); |
3e082a91 MW |
1780 | return; |
1781 | } | |
1782 | ||
1783 | wait_for_completion(&data->prev_finished); | |
1784 | ||
1785 | scsi_sysfs_add_devices(shost); | |
1786 | ||
6b7f123f | 1787 | spin_lock_irqsave(shost->host_lock, flags); |
3e082a91 | 1788 | shost->async_scan = 0; |
6b7f123f MW |
1789 | spin_unlock_irqrestore(shost->host_lock, flags); |
1790 | ||
1791 | mutex_unlock(&shost->scan_mutex); | |
1792 | ||
1793 | spin_lock(&async_scan_lock); | |
3e082a91 MW |
1794 | list_del(&data->list); |
1795 | if (!list_empty(&scanning_hosts)) { | |
1796 | struct async_scan_data *next = list_entry(scanning_hosts.next, | |
1797 | struct async_scan_data, list); | |
1798 | complete(&next->prev_finished); | |
1799 | } | |
1800 | spin_unlock(&async_scan_lock); | |
1801 | ||
267a6ad4 | 1802 | scsi_autopm_put_host(shost); |
3e082a91 MW |
1803 | scsi_host_put(shost); |
1804 | kfree(data); | |
1805 | } | |
1806 | ||
1aa8fab2 | 1807 | static void do_scsi_scan_host(struct Scsi_Host *shost) |
3e082a91 | 1808 | { |
1aa8fab2 MW |
1809 | if (shost->hostt->scan_finished) { |
1810 | unsigned long start = jiffies; | |
1811 | if (shost->hostt->scan_start) | |
1812 | shost->hostt->scan_start(shost); | |
1813 | ||
1814 | while (!shost->hostt->scan_finished(shost, jiffies - start)) | |
1815 | msleep(10); | |
1816 | } else { | |
1817 | scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD, | |
3e082a91 | 1818 | SCAN_WILD_CARD, 0); |
1aa8fab2 MW |
1819 | } |
1820 | } | |
3e082a91 | 1821 | |
6cdd5520 | 1822 | static void do_scan_async(void *_data, async_cookie_t c) |
1aa8fab2 MW |
1823 | { |
1824 | struct async_scan_data *data = _data; | |
bc4f2401 AS |
1825 | struct Scsi_Host *shost = data->shost; |
1826 | ||
1827 | do_scsi_scan_host(shost); | |
3e082a91 | 1828 | scsi_finish_async_scan(data); |
3e082a91 MW |
1829 | } |
1830 | ||
1da177e4 LT |
1831 | /** |
1832 | * scsi_scan_host - scan the given adapter | |
1833 | * @shost: adapter to scan | |
1834 | **/ | |
1835 | void scsi_scan_host(struct Scsi_Host *shost) | |
1836 | { | |
3e082a91 MW |
1837 | struct async_scan_data *data; |
1838 | ||
1d645088 HR |
1839 | if (strncmp(scsi_scan_type, "none", 4) == 0 || |
1840 | strncmp(scsi_scan_type, "manual", 6) == 0) | |
3e082a91 | 1841 | return; |
bc4f2401 AS |
1842 | if (scsi_autopm_get_host(shost) < 0) |
1843 | return; | |
3e082a91 MW |
1844 | |
1845 | data = scsi_prep_async_scan(shost); | |
1846 | if (!data) { | |
1aa8fab2 | 1847 | do_scsi_scan_host(shost); |
bc4f2401 | 1848 | scsi_autopm_put_host(shost); |
3e082a91 MW |
1849 | return; |
1850 | } | |
1aa8fab2 | 1851 | |
6cdd5520 DW |
1852 | /* register with the async subsystem so wait_for_device_probe() |
1853 | * will flush this work | |
1854 | */ | |
1855 | async_schedule(do_scan_async, data); | |
1856 | ||
267a6ad4 | 1857 | /* scsi_autopm_put_host(shost) is called in scsi_finish_async_scan() */ |
1da177e4 LT |
1858 | } |
1859 | EXPORT_SYMBOL(scsi_scan_host); | |
1860 | ||
1da177e4 LT |
1861 | void scsi_forget_host(struct Scsi_Host *shost) |
1862 | { | |
a64358db | 1863 | struct scsi_device *sdev; |
1da177e4 LT |
1864 | unsigned long flags; |
1865 | ||
a64358db | 1866 | restart: |
1da177e4 | 1867 | spin_lock_irqsave(shost->host_lock, flags); |
a64358db AS |
1868 | list_for_each_entry(sdev, &shost->__devices, siblings) { |
1869 | if (sdev->sdev_state == SDEV_DEL) | |
1870 | continue; | |
1da177e4 | 1871 | spin_unlock_irqrestore(shost->host_lock, flags); |
a64358db AS |
1872 | __scsi_remove_device(sdev); |
1873 | goto restart; | |
1da177e4 LT |
1874 | } |
1875 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1876 | } | |
1877 | ||
9f6aa575 RD |
1878 | /** |
1879 | * scsi_get_host_dev - Create a scsi_device that points to the host adapter itself | |
1880 | * @shost: Host that needs a scsi_device | |
1da177e4 LT |
1881 | * |
1882 | * Lock status: None assumed. | |
1883 | * | |
f64a181d | 1884 | * Returns: The scsi_device or NULL |
1da177e4 LT |
1885 | * |
1886 | * Notes: | |
f64a181d | 1887 | * Attach a single scsi_device to the Scsi_Host - this should |
1da177e4 LT |
1888 | * be made to look like a "pseudo-device" that points to the |
1889 | * HA itself. | |
1890 | * | |
1891 | * Note - this device is not accessible from any high-level | |
1892 | * drivers (including generics), which is probably not | |
9f6aa575 | 1893 | * optimal. We can add hooks later to attach. |
1da177e4 LT |
1894 | */ |
1895 | struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost) | |
1896 | { | |
e517d313 | 1897 | struct scsi_device *sdev = NULL; |
1da177e4 LT |
1898 | struct scsi_target *starget; |
1899 | ||
0b950672 | 1900 | mutex_lock(&shost->scan_mutex); |
e517d313 AS |
1901 | if (!scsi_host_scan_allowed(shost)) |
1902 | goto out; | |
1da177e4 LT |
1903 | starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id); |
1904 | if (!starget) | |
e517d313 | 1905 | goto out; |
1da177e4 LT |
1906 | |
1907 | sdev = scsi_alloc_sdev(starget, 0, NULL); | |
d5469119 | 1908 | if (sdev) |
1da177e4 | 1909 | sdev->borken = 0; |
d5469119 | 1910 | else |
884d25cc | 1911 | scsi_target_reap(starget); |
1da177e4 | 1912 | put_device(&starget->dev); |
e517d313 | 1913 | out: |
0b950672 | 1914 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
1915 | return sdev; |
1916 | } | |
1917 | EXPORT_SYMBOL(scsi_get_host_dev); | |
1918 | ||
9f6aa575 RD |
1919 | /** |
1920 | * scsi_free_host_dev - Free a scsi_device that points to the host adapter itself | |
1921 | * @sdev: Host device to be freed | |
1da177e4 LT |
1922 | * |
1923 | * Lock status: None assumed. | |
1924 | * | |
1925 | * Returns: Nothing | |
1da177e4 LT |
1926 | */ |
1927 | void scsi_free_host_dev(struct scsi_device *sdev) | |
1928 | { | |
1929 | BUG_ON(sdev->id != sdev->host->this_id); | |
1930 | ||
860dc736 | 1931 | __scsi_remove_device(sdev); |
1da177e4 LT |
1932 | } |
1933 | EXPORT_SYMBOL(scsi_free_host_dev); | |
1934 |