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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> |
1da177e4 LT |
37 | |
38 | #include <scsi/scsi.h> | |
beb40487 | 39 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
40 | #include <scsi/scsi_device.h> |
41 | #include <scsi/scsi_driver.h> | |
42 | #include <scsi/scsi_devinfo.h> | |
43 | #include <scsi/scsi_host.h> | |
1da177e4 LT |
44 | #include <scsi/scsi_transport.h> |
45 | #include <scsi/scsi_eh.h> | |
46 | ||
47 | #include "scsi_priv.h" | |
48 | #include "scsi_logging.h" | |
49 | ||
50 | #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \ | |
51 | " SCSI scanning, some SCSI devices might not be configured\n" | |
52 | ||
53 | /* | |
54 | * Default timeout | |
55 | */ | |
56 | #define SCSI_TIMEOUT (2*HZ) | |
57 | ||
58 | /* | |
405ae7d3 | 59 | * Prefix values for the SCSI id's (stored in sysfs name field) |
1da177e4 LT |
60 | */ |
61 | #define SCSI_UID_SER_NUM 'S' | |
62 | #define SCSI_UID_UNKNOWN 'Z' | |
63 | ||
64 | /* | |
65 | * Return values of some of the scanning functions. | |
66 | * | |
67 | * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this | |
68 | * includes allocation or general failures preventing IO from being sent. | |
69 | * | |
70 | * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available | |
71 | * on the given LUN. | |
72 | * | |
73 | * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a | |
74 | * given LUN. | |
75 | */ | |
76 | #define SCSI_SCAN_NO_RESPONSE 0 | |
77 | #define SCSI_SCAN_TARGET_PRESENT 1 | |
78 | #define SCSI_SCAN_LUN_PRESENT 2 | |
79 | ||
0ad78200 | 80 | static const char *scsi_null_device_strs = "nullnullnullnull"; |
1da177e4 LT |
81 | |
82 | #define MAX_SCSI_LUNS 512 | |
83 | ||
1da177e4 | 84 | static unsigned int max_scsi_luns = MAX_SCSI_LUNS; |
1da177e4 | 85 | |
10f4b89a | 86 | module_param_named(max_luns, max_scsi_luns, uint, S_IRUGO|S_IWUSR); |
1da177e4 LT |
87 | MODULE_PARM_DESC(max_luns, |
88 | "last scsi LUN (should be between 1 and 2^32-1)"); | |
89 | ||
21db1882 MW |
90 | #ifdef CONFIG_SCSI_SCAN_ASYNC |
91 | #define SCSI_SCAN_TYPE_DEFAULT "async" | |
92 | #else | |
93 | #define SCSI_SCAN_TYPE_DEFAULT "sync" | |
94 | #endif | |
95 | ||
3c31b52f | 96 | char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT; |
3e082a91 MW |
97 | |
98 | module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO); | |
99 | MODULE_PARM_DESC(scan, "sync, async or none"); | |
100 | ||
1da177e4 LT |
101 | /* |
102 | * max_scsi_report_luns: the maximum number of LUNS that will be | |
103 | * returned from the REPORT LUNS command. 8 times this value must | |
104 | * be allocated. In theory this could be up to an 8 byte value, but | |
105 | * in practice, the maximum number of LUNs suppored by any device | |
106 | * is about 16k. | |
107 | */ | |
108 | static unsigned int max_scsi_report_luns = 511; | |
109 | ||
10f4b89a | 110 | module_param_named(max_report_luns, max_scsi_report_luns, uint, S_IRUGO|S_IWUSR); |
1da177e4 LT |
111 | MODULE_PARM_DESC(max_report_luns, |
112 | "REPORT LUNS maximum number of LUNS received (should be" | |
113 | " between 1 and 16384)"); | |
114 | ||
14faf12f | 115 | static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ + 18; |
1da177e4 | 116 | |
10f4b89a | 117 | module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR); |
1da177e4 LT |
118 | MODULE_PARM_DESC(inq_timeout, |
119 | "Timeout (in seconds) waiting for devices to answer INQUIRY." | |
14faf12f | 120 | " Default is 20. Some devices may need more; most need less."); |
1da177e4 | 121 | |
6b7f123f | 122 | /* This lock protects only this list */ |
3e082a91 MW |
123 | static DEFINE_SPINLOCK(async_scan_lock); |
124 | static LIST_HEAD(scanning_hosts); | |
125 | ||
126 | struct async_scan_data { | |
127 | struct list_head list; | |
128 | struct Scsi_Host *shost; | |
129 | struct completion prev_finished; | |
130 | }; | |
131 | ||
132 | /** | |
133 | * scsi_complete_async_scans - Wait for asynchronous scans to complete | |
134 | * | |
8bcc2412 MW |
135 | * When this function returns, any host which started scanning before |
136 | * this function was called will have finished its scan. Hosts which | |
137 | * started scanning after this function was called may or may not have | |
138 | * finished. | |
3e082a91 MW |
139 | */ |
140 | int scsi_complete_async_scans(void) | |
141 | { | |
142 | struct async_scan_data *data; | |
143 | ||
144 | do { | |
145 | if (list_empty(&scanning_hosts)) | |
e96eb23d | 146 | return 0; |
3e082a91 MW |
147 | /* If we can't get memory immediately, that's OK. Just |
148 | * sleep a little. Even if we never get memory, the async | |
149 | * scans will finish eventually. | |
150 | */ | |
151 | data = kmalloc(sizeof(*data), GFP_KERNEL); | |
152 | if (!data) | |
153 | msleep(1); | |
154 | } while (!data); | |
155 | ||
156 | data->shost = NULL; | |
157 | init_completion(&data->prev_finished); | |
158 | ||
159 | spin_lock(&async_scan_lock); | |
160 | /* Check that there's still somebody else on the list */ | |
161 | if (list_empty(&scanning_hosts)) | |
162 | goto done; | |
163 | list_add_tail(&data->list, &scanning_hosts); | |
164 | spin_unlock(&async_scan_lock); | |
165 | ||
166 | printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n"); | |
167 | wait_for_completion(&data->prev_finished); | |
168 | ||
169 | spin_lock(&async_scan_lock); | |
170 | list_del(&data->list); | |
8bcc2412 MW |
171 | if (!list_empty(&scanning_hosts)) { |
172 | struct async_scan_data *next = list_entry(scanning_hosts.next, | |
173 | struct async_scan_data, list); | |
174 | complete(&next->prev_finished); | |
175 | } | |
3e082a91 MW |
176 | done: |
177 | spin_unlock(&async_scan_lock); | |
43a8d39d | 178 | |
e96eb23d | 179 | kfree(data); |
3e082a91 MW |
180 | return 0; |
181 | } | |
182 | ||
1da177e4 LT |
183 | /** |
184 | * scsi_unlock_floptical - unlock device via a special MODE SENSE command | |
39216033 | 185 | * @sdev: scsi device to send command to |
1da177e4 LT |
186 | * @result: area to store the result of the MODE SENSE |
187 | * | |
188 | * Description: | |
39216033 | 189 | * Send a vendor specific MODE SENSE (not a MODE SELECT) command. |
1da177e4 LT |
190 | * Called for BLIST_KEY devices. |
191 | **/ | |
39216033 | 192 | static void scsi_unlock_floptical(struct scsi_device *sdev, |
1da177e4 LT |
193 | unsigned char *result) |
194 | { | |
195 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
196 | ||
197 | printk(KERN_NOTICE "scsi: unlocking floptical drive\n"); | |
198 | scsi_cmd[0] = MODE_SENSE; | |
199 | scsi_cmd[1] = 0; | |
200 | scsi_cmd[2] = 0x2e; | |
201 | scsi_cmd[3] = 0; | |
39216033 | 202 | scsi_cmd[4] = 0x2a; /* size */ |
1da177e4 | 203 | scsi_cmd[5] = 0; |
39216033 | 204 | scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL, |
f4f4e47e | 205 | SCSI_TIMEOUT, 3, NULL); |
1da177e4 LT |
206 | } |
207 | ||
1da177e4 LT |
208 | /** |
209 | * scsi_alloc_sdev - allocate and setup a scsi_Device | |
eb44820c RL |
210 | * @starget: which target to allocate a &scsi_device for |
211 | * @lun: which lun | |
212 | * @hostdata: usually NULL and set by ->slave_alloc instead | |
1da177e4 LT |
213 | * |
214 | * Description: | |
215 | * Allocate, initialize for io, and return a pointer to a scsi_Device. | |
216 | * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and | |
217 | * adds scsi_Device to the appropriate list. | |
218 | * | |
219 | * Return value: | |
220 | * scsi_Device pointer, or NULL on failure. | |
221 | **/ | |
222 | static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, | |
223 | unsigned int lun, void *hostdata) | |
224 | { | |
225 | struct scsi_device *sdev; | |
226 | int display_failure_msg = 1, ret; | |
227 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
a341cd0f | 228 | extern void scsi_evt_thread(struct work_struct *work); |
9937a5e2 | 229 | extern void scsi_requeue_run_queue(struct work_struct *work); |
1da177e4 | 230 | |
24669f75 | 231 | sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size, |
1da177e4 LT |
232 | GFP_ATOMIC); |
233 | if (!sdev) | |
234 | goto out; | |
235 | ||
1da177e4 LT |
236 | sdev->vendor = scsi_null_device_strs; |
237 | sdev->model = scsi_null_device_strs; | |
238 | sdev->rev = scsi_null_device_strs; | |
239 | sdev->host = shost; | |
4a84067d | 240 | sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD; |
1da177e4 LT |
241 | sdev->id = starget->id; |
242 | sdev->lun = lun; | |
243 | sdev->channel = starget->channel; | |
244 | sdev->sdev_state = SDEV_CREATED; | |
245 | INIT_LIST_HEAD(&sdev->siblings); | |
246 | INIT_LIST_HEAD(&sdev->same_target_siblings); | |
247 | INIT_LIST_HEAD(&sdev->cmd_list); | |
248 | INIT_LIST_HEAD(&sdev->starved_entry); | |
a341cd0f | 249 | INIT_LIST_HEAD(&sdev->event_list); |
1da177e4 | 250 | spin_lock_init(&sdev->list_lock); |
a341cd0f | 251 | INIT_WORK(&sdev->event_work, scsi_evt_thread); |
9937a5e2 | 252 | INIT_WORK(&sdev->requeue_work, scsi_requeue_run_queue); |
1da177e4 LT |
253 | |
254 | sdev->sdev_gendev.parent = get_device(&starget->dev); | |
255 | sdev->sdev_target = starget; | |
256 | ||
257 | /* usually NULL and set by ->slave_alloc instead */ | |
258 | sdev->hostdata = hostdata; | |
259 | ||
260 | /* if the device needs this changing, it may do so in the | |
261 | * slave_configure function */ | |
262 | sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED; | |
263 | ||
264 | /* | |
265 | * Some low level driver could use device->type | |
266 | */ | |
267 | sdev->type = -1; | |
268 | ||
269 | /* | |
270 | * Assume that the device will have handshaking problems, | |
271 | * and then fix this field later if it turns out it | |
272 | * doesn't | |
273 | */ | |
274 | sdev->borken = 1; | |
275 | ||
1da177e4 LT |
276 | sdev->request_queue = scsi_alloc_queue(sdev); |
277 | if (!sdev->request_queue) { | |
278 | /* release fn is set up in scsi_sysfs_device_initialise, so | |
279 | * have to free and put manually here */ | |
280 | put_device(&starget->dev); | |
93f56089 | 281 | kfree(sdev); |
1da177e4 LT |
282 | goto out; |
283 | } | |
09ac46c4 | 284 | WARN_ON_ONCE(!blk_get_queue(sdev->request_queue)); |
1da177e4 LT |
285 | sdev->request_queue->queuedata = sdev; |
286 | scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun); | |
287 | ||
288 | scsi_sysfs_device_initialize(sdev); | |
289 | ||
290 | if (shost->hostt->slave_alloc) { | |
291 | ret = shost->hostt->slave_alloc(sdev); | |
292 | if (ret) { | |
293 | /* | |
294 | * if LLDD reports slave not present, don't clutter | |
295 | * console with alloc failure messages | |
1da177e4 LT |
296 | */ |
297 | if (ret == -ENXIO) | |
298 | display_failure_msg = 0; | |
299 | goto out_device_destroy; | |
300 | } | |
301 | } | |
302 | ||
303 | return sdev; | |
304 | ||
305 | out_device_destroy: | |
4e6c82b3 | 306 | __scsi_remove_device(sdev); |
1da177e4 LT |
307 | out: |
308 | if (display_failure_msg) | |
cadbd4a5 | 309 | printk(ALLOC_FAILURE_MSG, __func__); |
1da177e4 LT |
310 | return NULL; |
311 | } | |
312 | ||
643eb2d9 JB |
313 | static void scsi_target_destroy(struct scsi_target *starget) |
314 | { | |
315 | struct device *dev = &starget->dev; | |
316 | struct Scsi_Host *shost = dev_to_shost(dev->parent); | |
317 | unsigned long flags; | |
318 | ||
f2495e22 | 319 | starget->state = STARGET_DEL; |
643eb2d9 JB |
320 | transport_destroy_device(dev); |
321 | spin_lock_irqsave(shost->host_lock, flags); | |
322 | if (shost->hostt->target_destroy) | |
323 | shost->hostt->target_destroy(starget); | |
324 | list_del_init(&starget->siblings); | |
325 | spin_unlock_irqrestore(shost->host_lock, flags); | |
326 | put_device(dev); | |
327 | } | |
328 | ||
1da177e4 LT |
329 | static void scsi_target_dev_release(struct device *dev) |
330 | { | |
331 | struct device *parent = dev->parent; | |
332 | struct scsi_target *starget = to_scsi_target(dev); | |
a283bd37 | 333 | |
1da177e4 LT |
334 | kfree(starget); |
335 | put_device(parent); | |
336 | } | |
337 | ||
453cd0f3 | 338 | static struct device_type scsi_target_type = { |
b0ed4336 HR |
339 | .name = "scsi_target", |
340 | .release = scsi_target_dev_release, | |
341 | }; | |
342 | ||
1da177e4 LT |
343 | int scsi_is_target_device(const struct device *dev) |
344 | { | |
b0ed4336 | 345 | return dev->type == &scsi_target_type; |
1da177e4 LT |
346 | } |
347 | EXPORT_SYMBOL(scsi_is_target_device); | |
348 | ||
349 | static struct scsi_target *__scsi_find_target(struct device *parent, | |
350 | int channel, uint id) | |
351 | { | |
352 | struct scsi_target *starget, *found_starget = NULL; | |
353 | struct Scsi_Host *shost = dev_to_shost(parent); | |
354 | /* | |
355 | * Search for an existing target for this sdev. | |
356 | */ | |
357 | list_for_each_entry(starget, &shost->__targets, siblings) { | |
358 | if (starget->id == id && | |
359 | starget->channel == channel) { | |
360 | found_starget = starget; | |
361 | break; | |
362 | } | |
363 | } | |
364 | if (found_starget) | |
365 | get_device(&found_starget->dev); | |
366 | ||
367 | return found_starget; | |
368 | } | |
369 | ||
e63ed0d7 JB |
370 | /** |
371 | * scsi_target_reap_ref_release - remove target from visibility | |
372 | * @kref: the reap_ref in the target being released | |
373 | * | |
374 | * Called on last put of reap_ref, which is the indication that no device | |
375 | * under this target is visible anymore, so render the target invisible in | |
376 | * sysfs. Note: we have to be in user context here because the target reaps | |
377 | * should be done in places where the scsi device visibility is being removed. | |
378 | */ | |
379 | static void scsi_target_reap_ref_release(struct kref *kref) | |
380 | { | |
381 | struct scsi_target *starget | |
382 | = container_of(kref, struct scsi_target, reap_ref); | |
383 | ||
f2495e22 JB |
384 | /* |
385 | * if we get here and the target is still in the CREATED state that | |
386 | * means it was allocated but never made visible (because a scan | |
387 | * turned up no LUNs), so don't call device_del() on it. | |
388 | */ | |
389 | if (starget->state != STARGET_CREATED) { | |
390 | transport_remove_device(&starget->dev); | |
391 | device_del(&starget->dev); | |
392 | } | |
e63ed0d7 JB |
393 | scsi_target_destroy(starget); |
394 | } | |
395 | ||
396 | static void scsi_target_reap_ref_put(struct scsi_target *starget) | |
397 | { | |
398 | kref_put(&starget->reap_ref, scsi_target_reap_ref_release); | |
399 | } | |
400 | ||
884d25cc JB |
401 | /** |
402 | * scsi_alloc_target - allocate a new or find an existing target | |
403 | * @parent: parent of the target (need not be a scsi host) | |
404 | * @channel: target channel number (zero if no channels) | |
405 | * @id: target id number | |
406 | * | |
407 | * Return an existing target if one exists, provided it hasn't already | |
408 | * gone into STARGET_DEL state, otherwise allocate a new target. | |
409 | * | |
410 | * The target is returned with an incremented reference, so the caller | |
411 | * is responsible for both reaping and doing a last put | |
412 | */ | |
1da177e4 LT |
413 | static struct scsi_target *scsi_alloc_target(struct device *parent, |
414 | int channel, uint id) | |
415 | { | |
416 | struct Scsi_Host *shost = dev_to_shost(parent); | |
417 | struct device *dev = NULL; | |
418 | unsigned long flags; | |
419 | const int size = sizeof(struct scsi_target) | |
420 | + shost->transportt->target_size; | |
5c44cd2a | 421 | struct scsi_target *starget; |
1da177e4 | 422 | struct scsi_target *found_target; |
e63ed0d7 | 423 | int error, ref_got; |
1da177e4 | 424 | |
24669f75 | 425 | starget = kzalloc(size, GFP_KERNEL); |
1da177e4 | 426 | if (!starget) { |
cadbd4a5 | 427 | printk(KERN_ERR "%s: allocation failure\n", __func__); |
1da177e4 LT |
428 | return NULL; |
429 | } | |
1da177e4 LT |
430 | dev = &starget->dev; |
431 | device_initialize(dev); | |
e63ed0d7 | 432 | kref_init(&starget->reap_ref); |
1da177e4 | 433 | dev->parent = get_device(parent); |
71610f55 | 434 | dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id); |
b0ed4336 | 435 | dev->bus = &scsi_bus_type; |
b0ed4336 | 436 | dev->type = &scsi_target_type; |
1da177e4 LT |
437 | starget->id = id; |
438 | starget->channel = channel; | |
f0c0a376 | 439 | starget->can_queue = 0; |
1da177e4 LT |
440 | INIT_LIST_HEAD(&starget->siblings); |
441 | INIT_LIST_HEAD(&starget->devices); | |
643eb2d9 | 442 | starget->state = STARGET_CREATED; |
7c9d6f16 | 443 | starget->scsi_level = SCSI_2; |
c53a284f | 444 | starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED; |
ffedb452 | 445 | retry: |
1da177e4 LT |
446 | spin_lock_irqsave(shost->host_lock, flags); |
447 | ||
448 | found_target = __scsi_find_target(parent, channel, id); | |
449 | if (found_target) | |
450 | goto found; | |
451 | ||
452 | list_add_tail(&starget->siblings, &shost->__targets); | |
453 | spin_unlock_irqrestore(shost->host_lock, flags); | |
454 | /* allocate and add */ | |
a283bd37 | 455 | transport_setup_device(dev); |
a283bd37 | 456 | if (shost->hostt->target_alloc) { |
32f95792 | 457 | error = shost->hostt->target_alloc(starget); |
a283bd37 JB |
458 | |
459 | if(error) { | |
460 | dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error); | |
461 | /* don't want scsi_target_reap to do the final | |
462 | * put because it will be under the host lock */ | |
643eb2d9 | 463 | scsi_target_destroy(starget); |
a283bd37 JB |
464 | return NULL; |
465 | } | |
466 | } | |
884d25cc | 467 | get_device(dev); |
a283bd37 | 468 | |
1da177e4 LT |
469 | return starget; |
470 | ||
471 | found: | |
e63ed0d7 JB |
472 | /* |
473 | * release routine already fired if kref is zero, so if we can still | |
474 | * take the reference, the target must be alive. If we can't, it must | |
475 | * be dying and we need to wait for a new target | |
476 | */ | |
477 | ref_got = kref_get_unless_zero(&found_target->reap_ref); | |
478 | ||
1da177e4 | 479 | spin_unlock_irqrestore(shost->host_lock, flags); |
e63ed0d7 | 480 | if (ref_got) { |
12fb8c15 | 481 | put_device(dev); |
ffedb452 JB |
482 | return found_target; |
483 | } | |
e63ed0d7 JB |
484 | /* |
485 | * Unfortunately, we found a dying target; need to wait until it's | |
486 | * dead before we can get a new one. There is an anomaly here. We | |
487 | * *should* call scsi_target_reap() to balance the kref_get() of the | |
488 | * reap_ref above. However, since the target being released, it's | |
489 | * already invisible and the reap_ref is irrelevant. If we call | |
490 | * scsi_target_reap() we might spuriously do another device_del() on | |
491 | * an already invisible target. | |
492 | */ | |
ffedb452 | 493 | put_device(&found_target->dev); |
e63ed0d7 JB |
494 | /* |
495 | * length of time is irrelevant here, we just want to yield the CPU | |
496 | * for a tick to avoid busy waiting for the target to die. | |
497 | */ | |
498 | msleep(1); | |
ffedb452 | 499 | goto retry; |
1da177e4 LT |
500 | } |
501 | ||
502 | /** | |
503 | * scsi_target_reap - check to see if target is in use and destroy if not | |
1da177e4 LT |
504 | * @starget: target to be checked |
505 | * | |
506 | * This is used after removing a LUN or doing a last put of the target | |
507 | * it checks atomically that nothing is using the target and removes | |
508 | * it if so. | |
509 | */ | |
510 | void scsi_target_reap(struct scsi_target *starget) | |
511 | { | |
f2495e22 JB |
512 | /* |
513 | * serious problem if this triggers: STARGET_DEL is only set in the if | |
514 | * the reap_ref drops to zero, so we're trying to do another final put | |
515 | * on an already released kref | |
516 | */ | |
e63ed0d7 | 517 | BUG_ON(starget->state == STARGET_DEL); |
f2495e22 | 518 | scsi_target_reap_ref_put(starget); |
1da177e4 LT |
519 | } |
520 | ||
e5b3cd42 AS |
521 | /** |
522 | * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string | |
523 | * @s: INQUIRY result string to sanitize | |
524 | * @len: length of the string | |
525 | * | |
526 | * Description: | |
527 | * The SCSI spec says that INQUIRY vendor, product, and revision | |
528 | * strings must consist entirely of graphic ASCII characters, | |
529 | * padded on the right with spaces. Since not all devices obey | |
530 | * this rule, we will replace non-graphic or non-ASCII characters | |
531 | * with spaces. Exception: a NUL character is interpreted as a | |
532 | * string terminator, so all the following characters are set to | |
533 | * spaces. | |
534 | **/ | |
535 | static void sanitize_inquiry_string(unsigned char *s, int len) | |
536 | { | |
537 | int terminated = 0; | |
538 | ||
539 | for (; len > 0; (--len, ++s)) { | |
540 | if (*s == 0) | |
541 | terminated = 1; | |
542 | if (terminated || *s < 0x20 || *s > 0x7e) | |
543 | *s = ' '; | |
544 | } | |
545 | } | |
546 | ||
1da177e4 LT |
547 | /** |
548 | * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY | |
39216033 | 549 | * @sdev: scsi_device to probe |
1da177e4 | 550 | * @inq_result: area to store the INQUIRY result |
39216033 | 551 | * @result_len: len of inq_result |
1da177e4 LT |
552 | * @bflags: store any bflags found here |
553 | * | |
554 | * Description: | |
39216033 | 555 | * Probe the lun associated with @req using a standard SCSI INQUIRY; |
1da177e4 | 556 | * |
39216033 | 557 | * If the INQUIRY is successful, zero is returned and the |
1da177e4 | 558 | * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length |
f64a181d | 559 | * are copied to the scsi_device any flags value is stored in *@bflags. |
1da177e4 | 560 | **/ |
e5b3cd42 | 561 | static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result, |
39216033 | 562 | int result_len, int *bflags) |
1da177e4 | 563 | { |
1da177e4 LT |
564 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
565 | int first_inquiry_len, try_inquiry_len, next_inquiry_len; | |
566 | int response_len = 0; | |
39216033 | 567 | int pass, count, result; |
1da177e4 LT |
568 | struct scsi_sense_hdr sshdr; |
569 | ||
570 | *bflags = 0; | |
571 | ||
572 | /* Perform up to 3 passes. The first pass uses a conservative | |
573 | * transfer length of 36 unless sdev->inquiry_len specifies a | |
574 | * different value. */ | |
575 | first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36; | |
576 | try_inquiry_len = first_inquiry_len; | |
577 | pass = 1; | |
578 | ||
579 | next_pass: | |
9ccfc756 JB |
580 | SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
581 | "scsi scan: INQUIRY pass %d length %d\n", | |
582 | pass, try_inquiry_len)); | |
1da177e4 LT |
583 | |
584 | /* Each pass gets up to three chances to ignore Unit Attention */ | |
585 | for (count = 0; count < 3; ++count) { | |
5cd3bbfa FT |
586 | int resid; |
587 | ||
1da177e4 LT |
588 | memset(scsi_cmd, 0, 6); |
589 | scsi_cmd[0] = INQUIRY; | |
590 | scsi_cmd[4] = (unsigned char) try_inquiry_len; | |
1da177e4 LT |
591 | |
592 | memset(inq_result, 0, try_inquiry_len); | |
39216033 JB |
593 | |
594 | result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, | |
ea73a9f2 | 595 | inq_result, try_inquiry_len, &sshdr, |
f4f4e47e | 596 | HZ / 2 + HZ * scsi_inq_timeout, 3, |
5cd3bbfa | 597 | &resid); |
1da177e4 LT |
598 | |
599 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s " | |
600 | "with code 0x%x\n", | |
39216033 | 601 | result ? "failed" : "successful", result)); |
1da177e4 | 602 | |
39216033 | 603 | if (result) { |
1da177e4 LT |
604 | /* |
605 | * not-ready to ready transition [asc/ascq=0x28/0x0] | |
606 | * or power-on, reset [asc/ascq=0x29/0x0], continue. | |
607 | * INQUIRY should not yield UNIT_ATTENTION | |
608 | * but many buggy devices do so anyway. | |
609 | */ | |
39216033 | 610 | if ((driver_byte(result) & DRIVER_SENSE) && |
ea73a9f2 | 611 | scsi_sense_valid(&sshdr)) { |
1da177e4 LT |
612 | if ((sshdr.sense_key == UNIT_ATTENTION) && |
613 | ((sshdr.asc == 0x28) || | |
614 | (sshdr.asc == 0x29)) && | |
615 | (sshdr.ascq == 0)) | |
616 | continue; | |
617 | } | |
5cd3bbfa FT |
618 | } else { |
619 | /* | |
620 | * if nothing was transferred, we try | |
621 | * again. It's a workaround for some USB | |
622 | * devices. | |
623 | */ | |
624 | if (resid == try_inquiry_len) | |
625 | continue; | |
1da177e4 LT |
626 | } |
627 | break; | |
628 | } | |
629 | ||
39216033 | 630 | if (result == 0) { |
e5b3cd42 AS |
631 | sanitize_inquiry_string(&inq_result[8], 8); |
632 | sanitize_inquiry_string(&inq_result[16], 16); | |
633 | sanitize_inquiry_string(&inq_result[32], 4); | |
634 | ||
635 | response_len = inq_result[4] + 5; | |
1da177e4 LT |
636 | if (response_len > 255) |
637 | response_len = first_inquiry_len; /* sanity */ | |
638 | ||
639 | /* | |
640 | * Get any flags for this device. | |
641 | * | |
f64a181d CH |
642 | * XXX add a bflags to scsi_device, and replace the |
643 | * corresponding bit fields in scsi_device, so bflags | |
1da177e4 LT |
644 | * need not be passed as an argument. |
645 | */ | |
646 | *bflags = scsi_get_device_flags(sdev, &inq_result[8], | |
647 | &inq_result[16]); | |
648 | ||
649 | /* When the first pass succeeds we gain information about | |
650 | * what larger transfer lengths might work. */ | |
651 | if (pass == 1) { | |
652 | if (BLIST_INQUIRY_36 & *bflags) | |
653 | next_inquiry_len = 36; | |
654 | else if (BLIST_INQUIRY_58 & *bflags) | |
655 | next_inquiry_len = 58; | |
656 | else if (sdev->inquiry_len) | |
657 | next_inquiry_len = sdev->inquiry_len; | |
658 | else | |
659 | next_inquiry_len = response_len; | |
660 | ||
661 | /* If more data is available perform the second pass */ | |
662 | if (next_inquiry_len > try_inquiry_len) { | |
663 | try_inquiry_len = next_inquiry_len; | |
664 | pass = 2; | |
665 | goto next_pass; | |
666 | } | |
667 | } | |
668 | ||
669 | } else if (pass == 2) { | |
670 | printk(KERN_INFO "scsi scan: %d byte inquiry failed. " | |
671 | "Consider BLIST_INQUIRY_36 for this device\n", | |
672 | try_inquiry_len); | |
673 | ||
674 | /* If this pass failed, the third pass goes back and transfers | |
675 | * the same amount as we successfully got in the first pass. */ | |
676 | try_inquiry_len = first_inquiry_len; | |
677 | pass = 3; | |
678 | goto next_pass; | |
679 | } | |
680 | ||
681 | /* If the last transfer attempt got an error, assume the | |
682 | * peripheral doesn't exist or is dead. */ | |
39216033 JB |
683 | if (result) |
684 | return -EIO; | |
1da177e4 LT |
685 | |
686 | /* Don't report any more data than the device says is valid */ | |
687 | sdev->inquiry_len = min(try_inquiry_len, response_len); | |
688 | ||
689 | /* | |
690 | * XXX Abort if the response length is less than 36? If less than | |
691 | * 32, the lookup of the device flags (above) could be invalid, | |
692 | * and it would be possible to take an incorrect action - we do | |
693 | * not want to hang because of a short INQUIRY. On the flip side, | |
694 | * if the device is spun down or becoming ready (and so it gives a | |
695 | * short INQUIRY), an abort here prevents any further use of the | |
696 | * device, including spin up. | |
697 | * | |
e423ee31 AS |
698 | * On the whole, the best approach seems to be to assume the first |
699 | * 36 bytes are valid no matter what the device says. That's | |
700 | * better than copying < 36 bytes to the inquiry-result buffer | |
701 | * and displaying garbage for the Vendor, Product, or Revision | |
702 | * strings. | |
703 | */ | |
704 | if (sdev->inquiry_len < 36) { | |
705 | printk(KERN_INFO "scsi scan: INQUIRY result too short (%d)," | |
706 | " using 36\n", sdev->inquiry_len); | |
707 | sdev->inquiry_len = 36; | |
708 | } | |
709 | ||
710 | /* | |
1da177e4 LT |
711 | * Related to the above issue: |
712 | * | |
713 | * XXX Devices (disk or all?) should be sent a TEST UNIT READY, | |
714 | * and if not ready, sent a START_STOP to start (maybe spin up) and | |
715 | * then send the INQUIRY again, since the INQUIRY can change after | |
716 | * a device is initialized. | |
717 | * | |
718 | * Ideally, start a device if explicitly asked to do so. This | |
719 | * assumes that a device is spun up on power on, spun down on | |
720 | * request, and then spun up on request. | |
721 | */ | |
722 | ||
723 | /* | |
724 | * The scanning code needs to know the scsi_level, even if no | |
725 | * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so | |
726 | * non-zero LUNs can be scanned. | |
727 | */ | |
728 | sdev->scsi_level = inq_result[2] & 0x07; | |
729 | if (sdev->scsi_level >= 2 || | |
730 | (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1)) | |
731 | sdev->scsi_level++; | |
6f3a2024 | 732 | sdev->sdev_target->scsi_level = sdev->scsi_level; |
1da177e4 | 733 | |
39216033 | 734 | return 0; |
1da177e4 LT |
735 | } |
736 | ||
737 | /** | |
f64a181d | 738 | * scsi_add_lun - allocate and fully initialze a scsi_device |
6d877688 | 739 | * @sdev: holds information to be stored in the new scsi_device |
1da177e4 LT |
740 | * @inq_result: holds the result of a previous INQUIRY to the LUN |
741 | * @bflags: black/white list flag | |
6d877688 | 742 | * @async: 1 if this device is being scanned asynchronously |
1da177e4 LT |
743 | * |
744 | * Description: | |
6d877688 MW |
745 | * Initialize the scsi_device @sdev. Optionally set fields based |
746 | * on values in *@bflags. | |
1da177e4 LT |
747 | * |
748 | * Return: | |
f64a181d CH |
749 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device |
750 | * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized | |
1da177e4 | 751 | **/ |
e5b3cd42 | 752 | static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, |
3e082a91 | 753 | int *bflags, int async) |
1da177e4 | 754 | { |
6f4267e3 JB |
755 | int ret; |
756 | ||
1da177e4 LT |
757 | /* |
758 | * XXX do not save the inquiry, since it can change underneath us, | |
759 | * save just vendor/model/rev. | |
760 | * | |
761 | * Rather than save it and have an ioctl that retrieves the saved | |
762 | * value, have an ioctl that executes the same INQUIRY code used | |
763 | * in scsi_probe_lun, let user level programs doing INQUIRY | |
764 | * scanning run at their own risk, or supply a user level program | |
765 | * that can correctly scan. | |
766 | */ | |
09123d23 AS |
767 | |
768 | /* | |
769 | * Copy at least 36 bytes of INQUIRY data, so that we don't | |
770 | * dereference unallocated memory when accessing the Vendor, | |
771 | * Product, and Revision strings. Badly behaved devices may set | |
772 | * the INQUIRY Additional Length byte to a small value, indicating | |
773 | * these strings are invalid, but often they contain plausible data | |
774 | * nonetheless. It doesn't matter if the device sent < 36 bytes | |
775 | * total, since scsi_probe_lun() initializes inq_result with 0s. | |
776 | */ | |
777 | sdev->inquiry = kmemdup(inq_result, | |
778 | max_t(size_t, sdev->inquiry_len, 36), | |
779 | GFP_ATOMIC); | |
780 | if (sdev->inquiry == NULL) | |
1da177e4 | 781 | return SCSI_SCAN_NO_RESPONSE; |
1da177e4 | 782 | |
1da177e4 LT |
783 | sdev->vendor = (char *) (sdev->inquiry + 8); |
784 | sdev->model = (char *) (sdev->inquiry + 16); | |
785 | sdev->rev = (char *) (sdev->inquiry + 32); | |
786 | ||
14216561 JB |
787 | if (strncmp(sdev->vendor, "ATA ", 8) == 0) { |
788 | /* | |
789 | * sata emulation layer device. This is a hack to work around | |
790 | * the SATL power management specifications which state that | |
791 | * when the SATL detects the device has gone into standby | |
792 | * mode, it shall respond with NOT READY. | |
793 | */ | |
794 | sdev->allow_restart = 1; | |
795 | } | |
796 | ||
1da177e4 | 797 | if (*bflags & BLIST_ISROM) { |
6d877688 MW |
798 | sdev->type = TYPE_ROM; |
799 | sdev->removable = 1; | |
800 | } else { | |
801 | sdev->type = (inq_result[0] & 0x1f); | |
802 | sdev->removable = (inq_result[1] & 0x80) >> 7; | |
803 | } | |
1da177e4 | 804 | |
6d877688 | 805 | switch (sdev->type) { |
ddaf6fc8 | 806 | case TYPE_RBC: |
1da177e4 LT |
807 | case TYPE_TAPE: |
808 | case TYPE_DISK: | |
809 | case TYPE_PRINTER: | |
810 | case TYPE_MOD: | |
811 | case TYPE_PROCESSOR: | |
812 | case TYPE_SCANNER: | |
813 | case TYPE_MEDIUM_CHANGER: | |
814 | case TYPE_ENCLOSURE: | |
815 | case TYPE_COMM: | |
4d7db04a | 816 | case TYPE_RAID: |
82443a58 | 817 | case TYPE_OSD: |
1da177e4 LT |
818 | sdev->writeable = 1; |
819 | break; | |
1da177e4 | 820 | case TYPE_ROM: |
ddaf6fc8 | 821 | case TYPE_WORM: |
1da177e4 LT |
822 | sdev->writeable = 0; |
823 | break; | |
824 | default: | |
825 | printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type); | |
826 | } | |
827 | ||
6d877688 MW |
828 | if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) { |
829 | /* RBC and MMC devices can return SCSI-3 compliance and yet | |
830 | * still not support REPORT LUNS, so make them act as | |
831 | * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is | |
832 | * specifically set */ | |
833 | if ((*bflags & BLIST_REPORTLUN2) == 0) | |
834 | *bflags |= BLIST_NOREPORTLUN; | |
835 | } | |
836 | ||
1da177e4 LT |
837 | /* |
838 | * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI | |
839 | * spec says: The device server is capable of supporting the | |
840 | * specified peripheral device type on this logical unit. However, | |
841 | * the physical device is not currently connected to this logical | |
842 | * unit. | |
843 | * | |
844 | * The above is vague, as it implies that we could treat 001 and | |
845 | * 011 the same. Stay compatible with previous code, and create a | |
f64a181d | 846 | * scsi_device for a PQ of 1 |
1da177e4 LT |
847 | * |
848 | * Don't set the device offline here; rather let the upper | |
849 | * level drivers eval the PQ to decide whether they should | |
850 | * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check. | |
851 | */ | |
852 | ||
853 | sdev->inq_periph_qual = (inq_result[0] >> 5) & 7; | |
1da177e4 LT |
854 | sdev->lockable = sdev->removable; |
855 | sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2); | |
856 | ||
6d877688 MW |
857 | if (sdev->scsi_level >= SCSI_3 || |
858 | (sdev->inquiry_len > 56 && inq_result[56] & 0x04)) | |
1da177e4 LT |
859 | sdev->ppr = 1; |
860 | if (inq_result[7] & 0x60) | |
861 | sdev->wdtr = 1; | |
862 | if (inq_result[7] & 0x10) | |
863 | sdev->sdtr = 1; | |
864 | ||
19ac0db3 | 865 | sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d " |
4ff36718 MW |
866 | "ANSI: %d%s\n", scsi_device_type(sdev->type), |
867 | sdev->vendor, sdev->model, sdev->rev, | |
868 | sdev->inq_periph_qual, inq_result[2] & 0x07, | |
869 | (inq_result[3] & 0x0f) == 1 ? " CCS" : ""); | |
870 | ||
1da177e4 LT |
871 | if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) && |
872 | !(*bflags & BLIST_NOTQ)) | |
873 | sdev->tagged_supported = 1; | |
6d877688 | 874 | |
1da177e4 LT |
875 | /* |
876 | * Some devices (Texel CD ROM drives) have handshaking problems | |
877 | * when used with the Seagate controllers. borken is initialized | |
878 | * to 1, and then set it to 0 here. | |
879 | */ | |
880 | if ((*bflags & BLIST_BORKEN) == 0) | |
881 | sdev->borken = 0; | |
882 | ||
6d877688 MW |
883 | if (*bflags & BLIST_NO_ULD_ATTACH) |
884 | sdev->no_uld_attach = 1; | |
885 | ||
1da177e4 LT |
886 | /* |
887 | * Apparently some really broken devices (contrary to the SCSI | |
888 | * standards) need to be selected without asserting ATN | |
889 | */ | |
890 | if (*bflags & BLIST_SELECT_NO_ATN) | |
891 | sdev->select_no_atn = 1; | |
892 | ||
4d7db04a JB |
893 | /* |
894 | * Maximum 512 sector transfer length | |
895 | * broken RA4x00 Compaq Disk Array | |
896 | */ | |
897 | if (*bflags & BLIST_MAX_512) | |
086fa5ff | 898 | blk_queue_max_hw_sectors(sdev->request_queue, 512); |
4d7db04a | 899 | |
1da177e4 LT |
900 | /* |
901 | * Some devices may not want to have a start command automatically | |
902 | * issued when a device is added. | |
903 | */ | |
904 | if (*bflags & BLIST_NOSTARTONADD) | |
905 | sdev->no_start_on_add = 1; | |
906 | ||
907 | if (*bflags & BLIST_SINGLELUN) | |
25d7c363 | 908 | scsi_target(sdev)->single_lun = 1; |
1da177e4 | 909 | |
1da177e4 LT |
910 | sdev->use_10_for_rw = 1; |
911 | ||
912 | if (*bflags & BLIST_MS_SKIP_PAGE_08) | |
913 | sdev->skip_ms_page_8 = 1; | |
914 | ||
915 | if (*bflags & BLIST_MS_SKIP_PAGE_3F) | |
916 | sdev->skip_ms_page_3f = 1; | |
917 | ||
918 | if (*bflags & BLIST_USE_10_BYTE_MS) | |
919 | sdev->use_10_for_ms = 1; | |
920 | ||
921 | /* set the device running here so that slave configure | |
922 | * may do I/O */ | |
6f4267e3 JB |
923 | ret = scsi_device_set_state(sdev, SDEV_RUNNING); |
924 | if (ret) { | |
925 | ret = scsi_device_set_state(sdev, SDEV_BLOCK); | |
926 | ||
927 | if (ret) { | |
928 | sdev_printk(KERN_ERR, sdev, | |
929 | "in wrong state %s to complete scan\n", | |
930 | scsi_device_state_name(sdev->sdev_state)); | |
931 | return SCSI_SCAN_NO_RESPONSE; | |
932 | } | |
933 | } | |
1da177e4 LT |
934 | |
935 | if (*bflags & BLIST_MS_192_BYTES_FOR_3F) | |
936 | sdev->use_192_bytes_for_3f = 1; | |
937 | ||
938 | if (*bflags & BLIST_NOT_LOCKABLE) | |
939 | sdev->lockable = 0; | |
940 | ||
941 | if (*bflags & BLIST_RETRY_HWERROR) | |
942 | sdev->retry_hwerror = 1; | |
943 | ||
d974e426 MP |
944 | if (*bflags & BLIST_NO_DIF) |
945 | sdev->no_dif = 1; | |
946 | ||
0816c925 MP |
947 | sdev->eh_timeout = SCSI_DEFAULT_EH_TIMEOUT; |
948 | ||
56f2a801 MP |
949 | if (*bflags & BLIST_SKIP_VPD_PAGES) |
950 | sdev->skip_vpd_pages = 1; | |
951 | ||
1da177e4 LT |
952 | transport_configure_device(&sdev->sdev_gendev); |
953 | ||
93805091 | 954 | if (sdev->host->hostt->slave_configure) { |
6f4267e3 | 955 | ret = sdev->host->hostt->slave_configure(sdev); |
93805091 CH |
956 | if (ret) { |
957 | /* | |
958 | * if LLDD reports slave not present, don't clutter | |
959 | * console with alloc failure messages | |
960 | */ | |
961 | if (ret != -ENXIO) { | |
962 | sdev_printk(KERN_ERR, sdev, | |
963 | "failed to configure device\n"); | |
964 | } | |
965 | return SCSI_SCAN_NO_RESPONSE; | |
966 | } | |
967 | } | |
1da177e4 | 968 | |
b3ae8780 HR |
969 | if (sdev->scsi_level >= SCSI_3) |
970 | scsi_attach_vpd(sdev); | |
971 | ||
4a84067d VD |
972 | sdev->max_queue_depth = sdev->queue_depth; |
973 | ||
1da177e4 LT |
974 | /* |
975 | * Ok, the device is now all set up, we can | |
976 | * register it and tell the rest of the kernel | |
977 | * about it. | |
978 | */ | |
3e082a91 | 979 | if (!async && scsi_sysfs_add_sdev(sdev) != 0) |
b24b1033 | 980 | return SCSI_SCAN_NO_RESPONSE; |
1da177e4 LT |
981 | |
982 | return SCSI_SCAN_LUN_PRESENT; | |
983 | } | |
984 | ||
c5f2e640 | 985 | #ifdef CONFIG_SCSI_LOGGING |
6c7154c9 | 986 | /** |
eb44820c | 987 | * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace |
6c7154c9 KG |
988 | * @buf: Output buffer with at least end-first+1 bytes of space |
989 | * @inq: Inquiry buffer (input) | |
990 | * @first: Offset of string into inq | |
991 | * @end: Index after last character in inq | |
992 | */ | |
c5f2e640 | 993 | static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq, |
6c7154c9 KG |
994 | unsigned first, unsigned end) |
995 | { | |
996 | unsigned term = 0, idx; | |
c5f2e640 | 997 | |
998 | for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) { | |
999 | if (inq[idx+first] > ' ') { | |
6c7154c9 KG |
1000 | buf[idx] = inq[idx+first]; |
1001 | term = idx+1; | |
1002 | } else { | |
1003 | buf[idx] = ' '; | |
1004 | } | |
1005 | } | |
1006 | buf[term] = 0; | |
1007 | return buf; | |
1008 | } | |
c5f2e640 | 1009 | #endif |
6f3a2024 | 1010 | |
1da177e4 LT |
1011 | /** |
1012 | * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it | |
1013 | * @starget: pointer to target device structure | |
1014 | * @lun: LUN of target device | |
1da177e4 | 1015 | * @bflagsp: store bflags here if not NULL |
eb44820c RL |
1016 | * @sdevp: probe the LUN corresponding to this scsi_device |
1017 | * @rescan: if nonzero skip some code only needed on first scan | |
1018 | * @hostdata: passed to scsi_alloc_sdev() | |
1da177e4 LT |
1019 | * |
1020 | * Description: | |
1021 | * Call scsi_probe_lun, if a LUN with an attached device is found, | |
1022 | * allocate and set it up by calling scsi_add_lun. | |
1023 | * | |
1024 | * Return: | |
f64a181d | 1025 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device |
1da177e4 LT |
1026 | * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is |
1027 | * attached at the LUN | |
f64a181d | 1028 | * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized |
1da177e4 LT |
1029 | **/ |
1030 | static int scsi_probe_and_add_lun(struct scsi_target *starget, | |
1031 | uint lun, int *bflagsp, | |
1032 | struct scsi_device **sdevp, int rescan, | |
1033 | void *hostdata) | |
1034 | { | |
1035 | struct scsi_device *sdev; | |
1da177e4 | 1036 | unsigned char *result; |
39216033 | 1037 | int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256; |
1da177e4 LT |
1038 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
1039 | ||
1040 | /* | |
1041 | * The rescan flag is used as an optimization, the first scan of a | |
1042 | * host adapter calls into here with rescan == 0. | |
1043 | */ | |
6f3a2024 JB |
1044 | sdev = scsi_device_lookup_by_target(starget, lun); |
1045 | if (sdev) { | |
0f1d87a2 | 1046 | if (rescan || !scsi_device_created(sdev)) { |
1da177e4 LT |
1047 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO |
1048 | "scsi scan: device exists on %s\n", | |
71610f55 | 1049 | dev_name(&sdev->sdev_gendev))); |
1da177e4 LT |
1050 | if (sdevp) |
1051 | *sdevp = sdev; | |
1052 | else | |
1053 | scsi_device_put(sdev); | |
1054 | ||
1055 | if (bflagsp) | |
1056 | *bflagsp = scsi_get_device_flags(sdev, | |
1057 | sdev->vendor, | |
1058 | sdev->model); | |
1059 | return SCSI_SCAN_LUN_PRESENT; | |
1060 | } | |
6f3a2024 JB |
1061 | scsi_device_put(sdev); |
1062 | } else | |
1063 | sdev = scsi_alloc_sdev(starget, lun, hostdata); | |
1da177e4 LT |
1064 | if (!sdev) |
1065 | goto out; | |
39216033 JB |
1066 | |
1067 | result = kmalloc(result_len, GFP_ATOMIC | | |
bc86120a | 1068 | ((shost->unchecked_isa_dma) ? __GFP_DMA : 0)); |
1da177e4 | 1069 | if (!result) |
39216033 | 1070 | goto out_free_sdev; |
1da177e4 | 1071 | |
39216033 | 1072 | if (scsi_probe_lun(sdev, result, result_len, &bflags)) |
1da177e4 LT |
1073 | goto out_free_result; |
1074 | ||
4186ab19 KG |
1075 | if (bflagsp) |
1076 | *bflagsp = bflags; | |
1da177e4 LT |
1077 | /* |
1078 | * result contains valid SCSI INQUIRY data. | |
1079 | */ | |
13f7e5ac | 1080 | if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) { |
1da177e4 LT |
1081 | /* |
1082 | * For a Peripheral qualifier 3 (011b), the SCSI | |
1083 | * spec says: The device server is not capable of | |
1084 | * supporting a physical device on this logical | |
1085 | * unit. | |
1086 | * | |
1087 | * For disks, this implies that there is no | |
1088 | * logical disk configured at sdev->lun, but there | |
1089 | * is a target id responding. | |
1090 | */ | |
6c7154c9 KG |
1091 | SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:" |
1092 | " peripheral qualifier of 3, device not" | |
1093 | " added\n")) | |
1094 | if (lun == 0) { | |
c5f2e640 | 1095 | SCSI_LOG_SCAN_BUS(1, { |
1096 | unsigned char vend[9]; | |
1097 | unsigned char mod[17]; | |
1098 | ||
1099 | sdev_printk(KERN_INFO, sdev, | |
6c7154c9 | 1100 | "scsi scan: consider passing scsi_mod." |
3424a65d | 1101 | "dev_flags=%s:%s:0x240 or 0x1000240\n", |
6c7154c9 | 1102 | scsi_inq_str(vend, result, 8, 16), |
c5f2e640 | 1103 | scsi_inq_str(mod, result, 16, 32)); |
1104 | }); | |
643eb2d9 | 1105 | |
6c7154c9 | 1106 | } |
643eb2d9 | 1107 | |
1da177e4 LT |
1108 | res = SCSI_SCAN_TARGET_PRESENT; |
1109 | goto out_free_result; | |
1110 | } | |
1111 | ||
1bfc5d9d | 1112 | /* |
84961f28 | 1113 | * Some targets may set slight variations of PQ and PDT to signal |
1114 | * that no LUN is present, so don't add sdev in these cases. | |
1115 | * Two specific examples are: | |
1116 | * 1) NetApp targets: return PQ=1, PDT=0x1f | |
1117 | * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved" | |
1118 | * in the UFI 1.0 spec (we cannot rely on reserved bits). | |
1119 | * | |
1120 | * References: | |
1121 | * 1) SCSI SPC-3, pp. 145-146 | |
1122 | * PQ=1: "A peripheral device having the specified peripheral | |
1123 | * device type is not connected to this logical unit. However, the | |
1124 | * device server is capable of supporting the specified peripheral | |
1125 | * device type on this logical unit." | |
1126 | * PDT=0x1f: "Unknown or no device type" | |
1127 | * 2) USB UFI 1.0, p. 20 | |
1128 | * PDT=00h Direct-access device (floppy) | |
1129 | * PDT=1Fh none (no FDD connected to the requested logical unit) | |
1bfc5d9d | 1130 | */ |
84961f28 | 1131 | if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) && |
01b291bd JB |
1132 | (result[0] & 0x1f) == 0x1f && |
1133 | !scsi_is_wlun(lun)) { | |
1bfc5d9d AS |
1134 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO |
1135 | "scsi scan: peripheral device type" | |
1136 | " of 31, no device added\n")); | |
1137 | res = SCSI_SCAN_TARGET_PRESENT; | |
1138 | goto out_free_result; | |
1139 | } | |
1140 | ||
3e082a91 | 1141 | res = scsi_add_lun(sdev, result, &bflags, shost->async_scan); |
1da177e4 LT |
1142 | if (res == SCSI_SCAN_LUN_PRESENT) { |
1143 | if (bflags & BLIST_KEY) { | |
1144 | sdev->lockable = 0; | |
39216033 | 1145 | scsi_unlock_floptical(sdev, result); |
1da177e4 | 1146 | } |
1da177e4 LT |
1147 | } |
1148 | ||
1149 | out_free_result: | |
1150 | kfree(result); | |
1da177e4 LT |
1151 | out_free_sdev: |
1152 | if (res == SCSI_SCAN_LUN_PRESENT) { | |
1153 | if (sdevp) { | |
b70d37bf AS |
1154 | if (scsi_device_get(sdev) == 0) { |
1155 | *sdevp = sdev; | |
1156 | } else { | |
1157 | __scsi_remove_device(sdev); | |
1158 | res = SCSI_SCAN_NO_RESPONSE; | |
1159 | } | |
1da177e4 | 1160 | } |
6f3a2024 | 1161 | } else |
860dc736 | 1162 | __scsi_remove_device(sdev); |
1da177e4 LT |
1163 | out: |
1164 | return res; | |
1165 | } | |
1166 | ||
1167 | /** | |
1168 | * scsi_sequential_lun_scan - sequentially scan a SCSI target | |
1169 | * @starget: pointer to target structure to scan | |
1170 | * @bflags: black/white list flag for LUN 0 | |
eb44820c RL |
1171 | * @scsi_level: Which version of the standard does this device adhere to |
1172 | * @rescan: passed to scsi_probe_add_lun() | |
1da177e4 LT |
1173 | * |
1174 | * Description: | |
1175 | * Generally, scan from LUN 1 (LUN 0 is assumed to already have been | |
1176 | * scanned) to some maximum lun until a LUN is found with no device | |
1177 | * attached. Use the bflags to figure out any oddities. | |
1178 | * | |
1179 | * Modifies sdevscan->lun. | |
1180 | **/ | |
1181 | static void scsi_sequential_lun_scan(struct scsi_target *starget, | |
4186ab19 | 1182 | int bflags, int scsi_level, int rescan) |
1da177e4 LT |
1183 | { |
1184 | unsigned int sparse_lun, lun, max_dev_lun; | |
1185 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
1186 | ||
1187 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of" | |
71610f55 | 1188 | "%s\n", dev_name(&starget->dev))); |
1da177e4 LT |
1189 | |
1190 | max_dev_lun = min(max_scsi_luns, shost->max_lun); | |
1191 | /* | |
1192 | * If this device is known to support sparse multiple units, | |
1193 | * override the other settings, and scan all of them. Normally, | |
1194 | * SCSI-3 devices should be scanned via the REPORT LUNS. | |
1195 | */ | |
1196 | if (bflags & BLIST_SPARSELUN) { | |
1197 | max_dev_lun = shost->max_lun; | |
1198 | sparse_lun = 1; | |
1199 | } else | |
1200 | sparse_lun = 0; | |
1201 | ||
1da177e4 LT |
1202 | /* |
1203 | * If less than SCSI_1_CSS, and no special lun scaning, stop | |
1204 | * scanning; this matches 2.4 behaviour, but could just be a bug | |
1205 | * (to continue scanning a SCSI_1_CSS device). | |
1206 | * | |
1207 | * This test is broken. We might not have any device on lun0 for | |
1208 | * a sparselun device, and if that's the case then how would we | |
1209 | * know the real scsi_level, eh? It might make sense to just not | |
1210 | * scan any SCSI_1 device for non-0 luns, but that check would best | |
1211 | * go into scsi_alloc_sdev() and just have it return null when asked | |
1212 | * to alloc an sdev for lun > 0 on an already found SCSI_1 device. | |
1213 | * | |
1214 | if ((sdevscan->scsi_level < SCSI_1_CCS) && | |
1215 | ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN)) | |
1216 | == 0)) | |
1217 | return; | |
1218 | */ | |
1219 | /* | |
1220 | * If this device is known to support multiple units, override | |
1221 | * the other settings, and scan all of them. | |
1222 | */ | |
1223 | if (bflags & BLIST_FORCELUN) | |
1224 | max_dev_lun = shost->max_lun; | |
1225 | /* | |
1226 | * REGAL CDC-4X: avoid hang after LUN 4 | |
1227 | */ | |
1228 | if (bflags & BLIST_MAX5LUN) | |
1229 | max_dev_lun = min(5U, max_dev_lun); | |
1230 | /* | |
1231 | * Do not scan SCSI-2 or lower device past LUN 7, unless | |
1232 | * BLIST_LARGELUN. | |
1233 | */ | |
1234 | if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN)) | |
1235 | max_dev_lun = min(8U, max_dev_lun); | |
1236 | ||
22ffeb48 HR |
1237 | /* |
1238 | * Stop scanning at 255 unless BLIST_SCSI3LUN | |
1239 | */ | |
1240 | if (!(bflags & BLIST_SCSI3LUN)) | |
1241 | max_dev_lun = min(256U, max_dev_lun); | |
1242 | ||
1da177e4 LT |
1243 | /* |
1244 | * We have already scanned LUN 0, so start at LUN 1. Keep scanning | |
1245 | * until we reach the max, or no LUN is found and we are not | |
1246 | * sparse_lun. | |
1247 | */ | |
1248 | for (lun = 1; lun < max_dev_lun; ++lun) | |
1249 | if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, | |
1250 | NULL) != SCSI_SCAN_LUN_PRESENT) && | |
1251 | !sparse_lun) | |
1252 | return; | |
1253 | } | |
1254 | ||
1255 | /** | |
9f6aa575 | 1256 | * scsilun_to_int - convert a scsi_lun to an int |
1da177e4 LT |
1257 | * @scsilun: struct scsi_lun to be converted. |
1258 | * | |
1259 | * Description: | |
1260 | * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered | |
1261 | * integer, and return the result. The caller must check for | |
1262 | * truncation before using this function. | |
1263 | * | |
1264 | * Notes: | |
1265 | * The struct scsi_lun is assumed to be four levels, with each level | |
1266 | * effectively containing a SCSI byte-ordered (big endian) short; the | |
1267 | * addressing bits of each level are ignored (the highest two bits). | |
1268 | * For a description of the LUN format, post SCSI-3 see the SCSI | |
1269 | * Architecture Model, for SCSI-3 see the SCSI Controller Commands. | |
1270 | * | |
1271 | * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns | |
1272 | * the integer: 0x0b030a04 | |
1273 | **/ | |
462b7859 | 1274 | int scsilun_to_int(struct scsi_lun *scsilun) |
1da177e4 LT |
1275 | { |
1276 | int i; | |
1277 | unsigned int lun; | |
1278 | ||
1279 | lun = 0; | |
1280 | for (i = 0; i < sizeof(lun); i += 2) | |
1281 | lun = lun | (((scsilun->scsi_lun[i] << 8) | | |
1282 | scsilun->scsi_lun[i + 1]) << (i * 8)); | |
1283 | return lun; | |
1284 | } | |
462b7859 | 1285 | EXPORT_SYMBOL(scsilun_to_int); |
1da177e4 | 1286 | |
2f4701d8 | 1287 | /** |
9f6aa575 | 1288 | * int_to_scsilun - reverts an int into a scsi_lun |
eb44820c | 1289 | * @lun: integer to be reverted |
2f4701d8 JSEC |
1290 | * @scsilun: struct scsi_lun to be set. |
1291 | * | |
1292 | * Description: | |
1293 | * Reverts the functionality of the scsilun_to_int, which packed | |
1294 | * an 8-byte lun value into an int. This routine unpacks the int | |
1295 | * back into the lun value. | |
1296 | * Note: the scsilun_to_int() routine does not truly handle all | |
1297 | * 8bytes of the lun value. This functions restores only as much | |
1298 | * as was set by the routine. | |
1299 | * | |
1300 | * Notes: | |
1301 | * Given an integer : 0x0b030a04, this function returns a | |
1302 | * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00 | |
1303 | * | |
1304 | **/ | |
1305 | void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun) | |
1306 | { | |
1307 | int i; | |
1308 | ||
1309 | memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun)); | |
1310 | ||
1311 | for (i = 0; i < sizeof(lun); i += 2) { | |
1312 | scsilun->scsi_lun[i] = (lun >> 8) & 0xFF; | |
1313 | scsilun->scsi_lun[i+1] = lun & 0xFF; | |
1314 | lun = lun >> 16; | |
1315 | } | |
1316 | } | |
1317 | EXPORT_SYMBOL(int_to_scsilun); | |
1318 | ||
1da177e4 LT |
1319 | /** |
1320 | * scsi_report_lun_scan - Scan using SCSI REPORT LUN results | |
eb44820c RL |
1321 | * @starget: which target |
1322 | * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN | |
1323 | * @rescan: nonzero if we can skip code only needed on first scan | |
1da177e4 LT |
1324 | * |
1325 | * Description: | |
eb44820c RL |
1326 | * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command. |
1327 | * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun. | |
1da177e4 | 1328 | * |
eb44820c RL |
1329 | * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8 |
1330 | * LUNs even if it's older than SCSI-3. | |
1331 | * If BLIST_NOREPORTLUN is set, return 1 always. | |
1332 | * If BLIST_NOLUN is set, return 0 always. | |
09b6b51b | 1333 | * If starget->no_report_luns is set, return 1 always. |
1da177e4 LT |
1334 | * |
1335 | * Return: | |
1336 | * 0: scan completed (or no memory, so further scanning is futile) | |
eb44820c | 1337 | * 1: could not scan with REPORT LUN |
1da177e4 | 1338 | **/ |
6f3a2024 | 1339 | static int scsi_report_lun_scan(struct scsi_target *starget, int bflags, |
1da177e4 LT |
1340 | int rescan) |
1341 | { | |
1342 | char devname[64]; | |
1343 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
1344 | unsigned int length; | |
1345 | unsigned int lun; | |
1346 | unsigned int num_luns; | |
1347 | unsigned int retries; | |
39216033 | 1348 | int result; |
1da177e4 | 1349 | struct scsi_lun *lunp, *lun_data; |
1da177e4 LT |
1350 | u8 *data; |
1351 | struct scsi_sense_hdr sshdr; | |
6f3a2024 JB |
1352 | struct scsi_device *sdev; |
1353 | struct Scsi_Host *shost = dev_to_shost(&starget->dev); | |
2ef89198 | 1354 | int ret = 0; |
1da177e4 LT |
1355 | |
1356 | /* | |
1357 | * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set. | |
1358 | * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does | |
1359 | * support more than 8 LUNs. | |
09b6b51b | 1360 | * Don't attempt if the target doesn't support REPORT LUNS. |
1da177e4 | 1361 | */ |
4d7db04a JB |
1362 | if (bflags & BLIST_NOREPORTLUN) |
1363 | return 1; | |
1364 | if (starget->scsi_level < SCSI_2 && | |
1365 | starget->scsi_level != SCSI_UNKNOWN) | |
1366 | return 1; | |
1367 | if (starget->scsi_level < SCSI_3 && | |
1368 | (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) | |
1da177e4 LT |
1369 | return 1; |
1370 | if (bflags & BLIST_NOLUN) | |
1371 | return 0; | |
09b6b51b AS |
1372 | if (starget->no_report_luns) |
1373 | return 1; | |
1da177e4 | 1374 | |
6f3a2024 JB |
1375 | if (!(sdev = scsi_device_lookup_by_target(starget, 0))) { |
1376 | sdev = scsi_alloc_sdev(starget, 0, NULL); | |
1377 | if (!sdev) | |
1378 | return 0; | |
75f8ee8e AS |
1379 | if (scsi_device_get(sdev)) { |
1380 | __scsi_remove_device(sdev); | |
6f3a2024 | 1381 | return 0; |
75f8ee8e | 1382 | } |
6f3a2024 JB |
1383 | } |
1384 | ||
1da177e4 | 1385 | sprintf(devname, "host %d channel %d id %d", |
6f3a2024 | 1386 | shost->host_no, sdev->channel, sdev->id); |
1da177e4 LT |
1387 | |
1388 | /* | |
1389 | * Allocate enough to hold the header (the same size as one scsi_lun) | |
1390 | * plus the max number of luns we are requesting. | |
1391 | * | |
1392 | * Reallocating and trying again (with the exact amount we need) | |
1393 | * would be nice, but then we need to somehow limit the size | |
1394 | * allocated based on the available memory and the limits of | |
1395 | * kmalloc - we don't want a kmalloc() failure of a huge value to | |
1396 | * prevent us from finding any LUNs on this target. | |
1397 | */ | |
1398 | length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun); | |
1399 | lun_data = kmalloc(length, GFP_ATOMIC | | |
1400 | (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0)); | |
6f3a2024 | 1401 | if (!lun_data) { |
cadbd4a5 | 1402 | printk(ALLOC_FAILURE_MSG, __func__); |
39216033 | 1403 | goto out; |
6f3a2024 | 1404 | } |
1da177e4 LT |
1405 | |
1406 | scsi_cmd[0] = REPORT_LUNS; | |
1407 | ||
1408 | /* | |
1409 | * bytes 1 - 5: reserved, set to zero. | |
1410 | */ | |
1411 | memset(&scsi_cmd[1], 0, 5); | |
1412 | ||
1413 | /* | |
1414 | * bytes 6 - 9: length of the command. | |
1415 | */ | |
1416 | scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff; | |
1417 | scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff; | |
1418 | scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff; | |
1419 | scsi_cmd[9] = (unsigned char) length & 0xff; | |
1420 | ||
1421 | scsi_cmd[10] = 0; /* reserved */ | |
1422 | scsi_cmd[11] = 0; /* control */ | |
1da177e4 LT |
1423 | |
1424 | /* | |
1425 | * We can get a UNIT ATTENTION, for example a power on/reset, so | |
1426 | * retry a few times (like sd.c does for TEST UNIT READY). | |
1427 | * Experience shows some combinations of adapter/devices get at | |
1428 | * least two power on/resets. | |
1429 | * | |
1430 | * Illegal requests (for devices that do not support REPORT LUNS) | |
1431 | * should come through as a check condition, and will not generate | |
1432 | * a retry. | |
1433 | */ | |
1434 | for (retries = 0; retries < 3; retries++) { | |
1435 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending" | |
1436 | " REPORT LUNS to %s (try %d)\n", devname, | |
1437 | retries)); | |
39216033 | 1438 | |
39216033 | 1439 | result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, |
ea73a9f2 | 1440 | lun_data, length, &sshdr, |
f4f4e47e | 1441 | SCSI_TIMEOUT + 4 * HZ, 3, NULL); |
39216033 | 1442 | |
1da177e4 | 1443 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS" |
39216033 JB |
1444 | " %s (try %d) result 0x%x\n", result |
1445 | ? "failed" : "successful", retries, result)); | |
1446 | if (result == 0) | |
1da177e4 | 1447 | break; |
ea73a9f2 | 1448 | else if (scsi_sense_valid(&sshdr)) { |
1da177e4 LT |
1449 | if (sshdr.sense_key != UNIT_ATTENTION) |
1450 | break; | |
1451 | } | |
1452 | } | |
1453 | ||
39216033 | 1454 | if (result) { |
1da177e4 LT |
1455 | /* |
1456 | * The device probably does not support a REPORT LUN command | |
1457 | */ | |
2ef89198 AS |
1458 | ret = 1; |
1459 | goto out_err; | |
1da177e4 | 1460 | } |
1da177e4 LT |
1461 | |
1462 | /* | |
1463 | * Get the length from the first four bytes of lun_data. | |
1464 | */ | |
1465 | data = (u8 *) lun_data->scsi_lun; | |
1466 | length = ((data[0] << 24) | (data[1] << 16) | | |
1467 | (data[2] << 8) | (data[3] << 0)); | |
1468 | ||
1469 | num_luns = (length / sizeof(struct scsi_lun)); | |
1470 | if (num_luns > max_scsi_report_luns) { | |
1471 | printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)" | |
1472 | " of %d luns reported, try increasing" | |
1473 | " max_scsi_report_luns.\n", devname, | |
1474 | max_scsi_report_luns, num_luns); | |
1475 | num_luns = max_scsi_report_luns; | |
1476 | } | |
1477 | ||
3bf743e7 JG |
1478 | SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, |
1479 | "scsi scan: REPORT LUN scan\n")); | |
1da177e4 LT |
1480 | |
1481 | /* | |
1482 | * Scan the luns in lun_data. The entry at offset 0 is really | |
1483 | * the header, so start at 1 and go up to and including num_luns. | |
1484 | */ | |
1485 | for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) { | |
1486 | lun = scsilun_to_int(lunp); | |
1487 | ||
1488 | /* | |
1489 | * Check if the unused part of lunp is non-zero, and so | |
1490 | * does not fit in lun. | |
1491 | */ | |
1492 | if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) { | |
1493 | int i; | |
1494 | ||
1495 | /* | |
1496 | * Output an error displaying the LUN in byte order, | |
1497 | * this differs from what linux would print for the | |
1498 | * integer LUN value. | |
1499 | */ | |
1500 | printk(KERN_WARNING "scsi: %s lun 0x", devname); | |
1501 | data = (char *)lunp->scsi_lun; | |
1502 | for (i = 0; i < sizeof(struct scsi_lun); i++) | |
1503 | printk("%02x", data[i]); | |
1504 | printk(" has a LUN larger than currently supported.\n"); | |
1da177e4 LT |
1505 | } else if (lun > sdev->host->max_lun) { |
1506 | printk(KERN_WARNING "scsi: %s lun%d has a LUN larger" | |
1507 | " than allowed by the host adapter\n", | |
1508 | devname, lun); | |
1509 | } else { | |
1510 | int res; | |
1511 | ||
1512 | res = scsi_probe_and_add_lun(starget, | |
1513 | lun, NULL, NULL, rescan, NULL); | |
1514 | if (res == SCSI_SCAN_NO_RESPONSE) { | |
1515 | /* | |
1516 | * Got some results, but now none, abort. | |
1517 | */ | |
3bf743e7 JG |
1518 | sdev_printk(KERN_ERR, sdev, |
1519 | "Unexpected response" | |
1520 | " from lun %d while scanning, scan" | |
1521 | " aborted\n", lun); | |
1da177e4 LT |
1522 | break; |
1523 | } | |
1524 | } | |
1525 | } | |
1526 | ||
2ef89198 | 1527 | out_err: |
1da177e4 | 1528 | kfree(lun_data); |
1da177e4 | 1529 | out: |
6f3a2024 | 1530 | scsi_device_put(sdev); |
0f1d87a2 | 1531 | if (scsi_device_created(sdev)) |
6f3a2024 JB |
1532 | /* |
1533 | * the sdev we used didn't appear in the report luns scan | |
1534 | */ | |
860dc736 | 1535 | __scsi_remove_device(sdev); |
2ef89198 | 1536 | return ret; |
1da177e4 LT |
1537 | } |
1538 | ||
1539 | struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel, | |
1540 | uint id, uint lun, void *hostdata) | |
1541 | { | |
a97a83a0 | 1542 | struct scsi_device *sdev = ERR_PTR(-ENODEV); |
1da177e4 | 1543 | struct device *parent = &shost->shost_gendev; |
e02f3f59 | 1544 | struct scsi_target *starget; |
1da177e4 | 1545 | |
938e2ac0 MW |
1546 | if (strncmp(scsi_scan_type, "none", 4) == 0) |
1547 | return ERR_PTR(-ENODEV); | |
1548 | ||
e02f3f59 | 1549 | starget = scsi_alloc_target(parent, channel, id); |
1da177e4 LT |
1550 | if (!starget) |
1551 | return ERR_PTR(-ENOMEM); | |
bc4f2401 | 1552 | scsi_autopm_get_target(starget); |
1da177e4 | 1553 | |
0b950672 | 1554 | mutex_lock(&shost->scan_mutex); |
6b7f123f MW |
1555 | if (!shost->async_scan) |
1556 | scsi_complete_async_scans(); | |
1557 | ||
bc4f2401 | 1558 | if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) { |
a97a83a0 | 1559 | scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata); |
bc4f2401 AS |
1560 | scsi_autopm_put_host(shost); |
1561 | } | |
0b950672 | 1562 | mutex_unlock(&shost->scan_mutex); |
bc4f2401 | 1563 | scsi_autopm_put_target(starget); |
e63ed0d7 JB |
1564 | /* |
1565 | * paired with scsi_alloc_target(). Target will be destroyed unless | |
1566 | * scsi_probe_and_add_lun made an underlying device visible | |
1567 | */ | |
1da177e4 LT |
1568 | scsi_target_reap(starget); |
1569 | put_device(&starget->dev); | |
1570 | ||
1571 | return sdev; | |
1572 | } | |
1573 | EXPORT_SYMBOL(__scsi_add_device); | |
1574 | ||
146f7262 JB |
1575 | int scsi_add_device(struct Scsi_Host *host, uint channel, |
1576 | uint target, uint lun) | |
1577 | { | |
1578 | struct scsi_device *sdev = | |
1579 | __scsi_add_device(host, channel, target, lun, NULL); | |
1580 | if (IS_ERR(sdev)) | |
1581 | return PTR_ERR(sdev); | |
1582 | ||
1583 | scsi_device_put(sdev); | |
1584 | return 0; | |
1585 | } | |
1586 | EXPORT_SYMBOL(scsi_add_device); | |
1587 | ||
1da177e4 LT |
1588 | void scsi_rescan_device(struct device *dev) |
1589 | { | |
1590 | struct scsi_driver *drv; | |
1591 | ||
1592 | if (!dev->driver) | |
1593 | return; | |
1594 | ||
1595 | drv = to_scsi_driver(dev->driver); | |
1596 | if (try_module_get(drv->owner)) { | |
1597 | if (drv->rescan) | |
1598 | drv->rescan(dev); | |
1599 | module_put(drv->owner); | |
1600 | } | |
1601 | } | |
1602 | EXPORT_SYMBOL(scsi_rescan_device); | |
1603 | ||
e517d313 AS |
1604 | static void __scsi_scan_target(struct device *parent, unsigned int channel, |
1605 | unsigned int id, unsigned int lun, int rescan) | |
1da177e4 LT |
1606 | { |
1607 | struct Scsi_Host *shost = dev_to_shost(parent); | |
1608 | int bflags = 0; | |
1609 | int res; | |
1da177e4 LT |
1610 | struct scsi_target *starget; |
1611 | ||
1612 | if (shost->this_id == id) | |
1613 | /* | |
1614 | * Don't scan the host adapter | |
1615 | */ | |
1616 | return; | |
1617 | ||
1da177e4 | 1618 | starget = scsi_alloc_target(parent, channel, id); |
1da177e4 LT |
1619 | if (!starget) |
1620 | return; | |
bc4f2401 | 1621 | scsi_autopm_get_target(starget); |
1da177e4 | 1622 | |
1da177e4 LT |
1623 | if (lun != SCAN_WILD_CARD) { |
1624 | /* | |
1625 | * Scan for a specific host/chan/id/lun. | |
1626 | */ | |
1627 | scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL); | |
1628 | goto out_reap; | |
1629 | } | |
1630 | ||
1631 | /* | |
1632 | * Scan LUN 0, if there is some response, scan further. Ideally, we | |
1633 | * would not configure LUN 0 until all LUNs are scanned. | |
1634 | */ | |
6f3a2024 JB |
1635 | res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL); |
1636 | if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) { | |
1637 | if (scsi_report_lun_scan(starget, bflags, rescan) != 0) | |
1da177e4 LT |
1638 | /* |
1639 | * The REPORT LUN did not scan the target, | |
1640 | * do a sequential scan. | |
1641 | */ | |
1642 | scsi_sequential_lun_scan(starget, bflags, | |
4186ab19 | 1643 | starget->scsi_level, rescan); |
1da177e4 | 1644 | } |
1da177e4 LT |
1645 | |
1646 | out_reap: | |
bc4f2401 | 1647 | scsi_autopm_put_target(starget); |
e63ed0d7 JB |
1648 | /* |
1649 | * paired with scsi_alloc_target(): determine if the target has | |
1650 | * any children at all and if not, nuke it | |
1651 | */ | |
1da177e4 LT |
1652 | scsi_target_reap(starget); |
1653 | ||
1654 | put_device(&starget->dev); | |
1655 | } | |
e517d313 AS |
1656 | |
1657 | /** | |
e59e4a09 | 1658 | * scsi_scan_target - scan a target id, possibly including all LUNs on the target. |
e517d313 AS |
1659 | * @parent: host to scan |
1660 | * @channel: channel to scan | |
1661 | * @id: target id to scan | |
1662 | * @lun: Specific LUN to scan or SCAN_WILD_CARD | |
1663 | * @rescan: passed to LUN scanning routines | |
1664 | * | |
1665 | * Description: | |
1666 | * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0, | |
1667 | * and possibly all LUNs on the target id. | |
1668 | * | |
1669 | * First try a REPORT LUN scan, if that does not scan the target, do a | |
1670 | * sequential scan of LUNs on the target id. | |
1671 | **/ | |
1672 | void scsi_scan_target(struct device *parent, unsigned int channel, | |
1673 | unsigned int id, unsigned int lun, int rescan) | |
1674 | { | |
1675 | struct Scsi_Host *shost = dev_to_shost(parent); | |
1676 | ||
93b45af5 MW |
1677 | if (strncmp(scsi_scan_type, "none", 4) == 0) |
1678 | return; | |
1679 | ||
6b7f123f | 1680 | mutex_lock(&shost->scan_mutex); |
3e082a91 MW |
1681 | if (!shost->async_scan) |
1682 | scsi_complete_async_scans(); | |
1683 | ||
bc4f2401 | 1684 | if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) { |
e517d313 | 1685 | __scsi_scan_target(parent, channel, id, lun, rescan); |
bc4f2401 AS |
1686 | scsi_autopm_put_host(shost); |
1687 | } | |
0b950672 | 1688 | mutex_unlock(&shost->scan_mutex); |
e517d313 | 1689 | } |
1da177e4 LT |
1690 | EXPORT_SYMBOL(scsi_scan_target); |
1691 | ||
1692 | static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel, | |
1693 | unsigned int id, unsigned int lun, int rescan) | |
1694 | { | |
1695 | uint order_id; | |
1696 | ||
1697 | if (id == SCAN_WILD_CARD) | |
1698 | for (id = 0; id < shost->max_id; ++id) { | |
1699 | /* | |
1700 | * XXX adapter drivers when possible (FCP, iSCSI) | |
1701 | * could modify max_id to match the current max, | |
1702 | * not the absolute max. | |
1703 | * | |
1704 | * XXX add a shost id iterator, so for example, | |
1705 | * the FC ID can be the same as a target id | |
1706 | * without a huge overhead of sparse id's. | |
1707 | */ | |
1708 | if (shost->reverse_ordering) | |
1709 | /* | |
1710 | * Scan from high to low id. | |
1711 | */ | |
1712 | order_id = shost->max_id - id - 1; | |
1713 | else | |
1714 | order_id = id; | |
e517d313 AS |
1715 | __scsi_scan_target(&shost->shost_gendev, channel, |
1716 | order_id, lun, rescan); | |
1da177e4 LT |
1717 | } |
1718 | else | |
e517d313 AS |
1719 | __scsi_scan_target(&shost->shost_gendev, channel, |
1720 | id, lun, rescan); | |
1da177e4 LT |
1721 | } |
1722 | ||
1723 | int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel, | |
1724 | unsigned int id, unsigned int lun, int rescan) | |
1725 | { | |
3bf743e7 JG |
1726 | SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost, |
1727 | "%s: <%u:%u:%u>\n", | |
cadbd4a5 | 1728 | __func__, channel, id, lun)); |
1da177e4 LT |
1729 | |
1730 | if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) || | |
091686d3 | 1731 | ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) || |
1da177e4 LT |
1732 | ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun))) |
1733 | return -EINVAL; | |
1734 | ||
0b950672 | 1735 | mutex_lock(&shost->scan_mutex); |
6b7f123f MW |
1736 | if (!shost->async_scan) |
1737 | scsi_complete_async_scans(); | |
1738 | ||
bc4f2401 | 1739 | if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) { |
82f29467 MA |
1740 | if (channel == SCAN_WILD_CARD) |
1741 | for (channel = 0; channel <= shost->max_channel; | |
1742 | channel++) | |
1743 | scsi_scan_channel(shost, channel, id, lun, | |
1744 | rescan); | |
1745 | else | |
1da177e4 | 1746 | scsi_scan_channel(shost, channel, id, lun, rescan); |
bc4f2401 | 1747 | scsi_autopm_put_host(shost); |
82f29467 | 1748 | } |
0b950672 | 1749 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
1750 | |
1751 | return 0; | |
1752 | } | |
1753 | ||
3e082a91 MW |
1754 | static void scsi_sysfs_add_devices(struct Scsi_Host *shost) |
1755 | { | |
1756 | struct scsi_device *sdev; | |
1757 | shost_for_each_device(sdev, shost) { | |
3b661a92 DW |
1758 | /* target removed before the device could be added */ |
1759 | if (sdev->sdev_state == SDEV_DEL) | |
1760 | continue; | |
6b7f123f MW |
1761 | if (!scsi_host_scan_allowed(shost) || |
1762 | scsi_sysfs_add_sdev(sdev) != 0) | |
860dc736 | 1763 | __scsi_remove_device(sdev); |
3e082a91 MW |
1764 | } |
1765 | } | |
1766 | ||
1767 | /** | |
1768 | * scsi_prep_async_scan - prepare for an async scan | |
1769 | * @shost: the host which will be scanned | |
1770 | * Returns: a cookie to be passed to scsi_finish_async_scan() | |
1771 | * | |
1772 | * Tells the midlayer this host is going to do an asynchronous scan. | |
1773 | * It reserves the host's position in the scanning list and ensures | |
1774 | * that other asynchronous scans started after this one won't affect the | |
1775 | * ordering of the discovered devices. | |
1776 | */ | |
1aa8fab2 | 1777 | static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost) |
3e082a91 MW |
1778 | { |
1779 | struct async_scan_data *data; | |
6b7f123f | 1780 | unsigned long flags; |
3e082a91 MW |
1781 | |
1782 | if (strncmp(scsi_scan_type, "sync", 4) == 0) | |
1783 | return NULL; | |
1784 | ||
1785 | if (shost->async_scan) { | |
cadbd4a5 | 1786 | printk("%s called twice for host %d", __func__, |
3e082a91 MW |
1787 | shost->host_no); |
1788 | dump_stack(); | |
1789 | return NULL; | |
1790 | } | |
1791 | ||
1792 | data = kmalloc(sizeof(*data), GFP_KERNEL); | |
1793 | if (!data) | |
1794 | goto err; | |
1795 | data->shost = scsi_host_get(shost); | |
1796 | if (!data->shost) | |
1797 | goto err; | |
1798 | init_completion(&data->prev_finished); | |
1799 | ||
6b7f123f MW |
1800 | mutex_lock(&shost->scan_mutex); |
1801 | spin_lock_irqsave(shost->host_lock, flags); | |
3e082a91 | 1802 | shost->async_scan = 1; |
6b7f123f MW |
1803 | spin_unlock_irqrestore(shost->host_lock, flags); |
1804 | mutex_unlock(&shost->scan_mutex); | |
1805 | ||
1806 | spin_lock(&async_scan_lock); | |
3e082a91 MW |
1807 | if (list_empty(&scanning_hosts)) |
1808 | complete(&data->prev_finished); | |
1809 | list_add_tail(&data->list, &scanning_hosts); | |
1810 | spin_unlock(&async_scan_lock); | |
1811 | ||
1812 | return data; | |
1813 | ||
1814 | err: | |
1815 | kfree(data); | |
1816 | return NULL; | |
1817 | } | |
1818 | ||
1819 | /** | |
1820 | * scsi_finish_async_scan - asynchronous scan has finished | |
1821 | * @data: cookie returned from earlier call to scsi_prep_async_scan() | |
1822 | * | |
1823 | * All the devices currently attached to this host have been found. | |
1824 | * This function announces all the devices it has found to the rest | |
1825 | * of the system. | |
1826 | */ | |
1aa8fab2 | 1827 | static void scsi_finish_async_scan(struct async_scan_data *data) |
3e082a91 MW |
1828 | { |
1829 | struct Scsi_Host *shost; | |
6b7f123f | 1830 | unsigned long flags; |
3e082a91 MW |
1831 | |
1832 | if (!data) | |
1833 | return; | |
1834 | ||
1835 | shost = data->shost; | |
6b7f123f MW |
1836 | |
1837 | mutex_lock(&shost->scan_mutex); | |
1838 | ||
3e082a91 | 1839 | if (!shost->async_scan) { |
cadbd4a5 | 1840 | printk("%s called twice for host %d", __func__, |
3e082a91 MW |
1841 | shost->host_no); |
1842 | dump_stack(); | |
773e82f6 | 1843 | mutex_unlock(&shost->scan_mutex); |
3e082a91 MW |
1844 | return; |
1845 | } | |
1846 | ||
1847 | wait_for_completion(&data->prev_finished); | |
1848 | ||
1849 | scsi_sysfs_add_devices(shost); | |
1850 | ||
6b7f123f | 1851 | spin_lock_irqsave(shost->host_lock, flags); |
3e082a91 | 1852 | shost->async_scan = 0; |
6b7f123f MW |
1853 | spin_unlock_irqrestore(shost->host_lock, flags); |
1854 | ||
1855 | mutex_unlock(&shost->scan_mutex); | |
1856 | ||
1857 | spin_lock(&async_scan_lock); | |
3e082a91 MW |
1858 | list_del(&data->list); |
1859 | if (!list_empty(&scanning_hosts)) { | |
1860 | struct async_scan_data *next = list_entry(scanning_hosts.next, | |
1861 | struct async_scan_data, list); | |
1862 | complete(&next->prev_finished); | |
1863 | } | |
1864 | spin_unlock(&async_scan_lock); | |
1865 | ||
267a6ad4 | 1866 | scsi_autopm_put_host(shost); |
3e082a91 MW |
1867 | scsi_host_put(shost); |
1868 | kfree(data); | |
1869 | } | |
1870 | ||
1aa8fab2 | 1871 | static void do_scsi_scan_host(struct Scsi_Host *shost) |
3e082a91 | 1872 | { |
1aa8fab2 MW |
1873 | if (shost->hostt->scan_finished) { |
1874 | unsigned long start = jiffies; | |
1875 | if (shost->hostt->scan_start) | |
1876 | shost->hostt->scan_start(shost); | |
1877 | ||
1878 | while (!shost->hostt->scan_finished(shost, jiffies - start)) | |
1879 | msleep(10); | |
1880 | } else { | |
1881 | scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD, | |
3e082a91 | 1882 | SCAN_WILD_CARD, 0); |
1aa8fab2 MW |
1883 | } |
1884 | } | |
3e082a91 | 1885 | |
6cdd5520 | 1886 | static void do_scan_async(void *_data, async_cookie_t c) |
1aa8fab2 MW |
1887 | { |
1888 | struct async_scan_data *data = _data; | |
bc4f2401 AS |
1889 | struct Scsi_Host *shost = data->shost; |
1890 | ||
1891 | do_scsi_scan_host(shost); | |
3e082a91 | 1892 | scsi_finish_async_scan(data); |
3e082a91 MW |
1893 | } |
1894 | ||
1da177e4 LT |
1895 | /** |
1896 | * scsi_scan_host - scan the given adapter | |
1897 | * @shost: adapter to scan | |
1898 | **/ | |
1899 | void scsi_scan_host(struct Scsi_Host *shost) | |
1900 | { | |
3e082a91 MW |
1901 | struct async_scan_data *data; |
1902 | ||
1903 | if (strncmp(scsi_scan_type, "none", 4) == 0) | |
1904 | return; | |
bc4f2401 AS |
1905 | if (scsi_autopm_get_host(shost) < 0) |
1906 | return; | |
3e082a91 MW |
1907 | |
1908 | data = scsi_prep_async_scan(shost); | |
1909 | if (!data) { | |
1aa8fab2 | 1910 | do_scsi_scan_host(shost); |
bc4f2401 | 1911 | scsi_autopm_put_host(shost); |
3e082a91 MW |
1912 | return; |
1913 | } | |
1aa8fab2 | 1914 | |
6cdd5520 DW |
1915 | /* register with the async subsystem so wait_for_device_probe() |
1916 | * will flush this work | |
1917 | */ | |
1918 | async_schedule(do_scan_async, data); | |
1919 | ||
267a6ad4 | 1920 | /* scsi_autopm_put_host(shost) is called in scsi_finish_async_scan() */ |
1da177e4 LT |
1921 | } |
1922 | EXPORT_SYMBOL(scsi_scan_host); | |
1923 | ||
1da177e4 LT |
1924 | void scsi_forget_host(struct Scsi_Host *shost) |
1925 | { | |
a64358db | 1926 | struct scsi_device *sdev; |
1da177e4 LT |
1927 | unsigned long flags; |
1928 | ||
a64358db | 1929 | restart: |
1da177e4 | 1930 | spin_lock_irqsave(shost->host_lock, flags); |
a64358db AS |
1931 | list_for_each_entry(sdev, &shost->__devices, siblings) { |
1932 | if (sdev->sdev_state == SDEV_DEL) | |
1933 | continue; | |
1da177e4 | 1934 | spin_unlock_irqrestore(shost->host_lock, flags); |
a64358db AS |
1935 | __scsi_remove_device(sdev); |
1936 | goto restart; | |
1da177e4 LT |
1937 | } |
1938 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1939 | } | |
1940 | ||
9f6aa575 RD |
1941 | /** |
1942 | * scsi_get_host_dev - Create a scsi_device that points to the host adapter itself | |
1943 | * @shost: Host that needs a scsi_device | |
1da177e4 LT |
1944 | * |
1945 | * Lock status: None assumed. | |
1946 | * | |
f64a181d | 1947 | * Returns: The scsi_device or NULL |
1da177e4 LT |
1948 | * |
1949 | * Notes: | |
f64a181d | 1950 | * Attach a single scsi_device to the Scsi_Host - this should |
1da177e4 LT |
1951 | * be made to look like a "pseudo-device" that points to the |
1952 | * HA itself. | |
1953 | * | |
1954 | * Note - this device is not accessible from any high-level | |
1955 | * drivers (including generics), which is probably not | |
9f6aa575 | 1956 | * optimal. We can add hooks later to attach. |
1da177e4 LT |
1957 | */ |
1958 | struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost) | |
1959 | { | |
e517d313 | 1960 | struct scsi_device *sdev = NULL; |
1da177e4 LT |
1961 | struct scsi_target *starget; |
1962 | ||
0b950672 | 1963 | mutex_lock(&shost->scan_mutex); |
e517d313 AS |
1964 | if (!scsi_host_scan_allowed(shost)) |
1965 | goto out; | |
1da177e4 LT |
1966 | starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id); |
1967 | if (!starget) | |
e517d313 | 1968 | goto out; |
1da177e4 LT |
1969 | |
1970 | sdev = scsi_alloc_sdev(starget, 0, NULL); | |
d5469119 | 1971 | if (sdev) |
1da177e4 | 1972 | sdev->borken = 0; |
d5469119 | 1973 | else |
884d25cc | 1974 | scsi_target_reap(starget); |
1da177e4 | 1975 | put_device(&starget->dev); |
e517d313 | 1976 | out: |
0b950672 | 1977 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
1978 | return sdev; |
1979 | } | |
1980 | EXPORT_SYMBOL(scsi_get_host_dev); | |
1981 | ||
9f6aa575 RD |
1982 | /** |
1983 | * scsi_free_host_dev - Free a scsi_device that points to the host adapter itself | |
1984 | * @sdev: Host device to be freed | |
1da177e4 LT |
1985 | * |
1986 | * Lock status: None assumed. | |
1987 | * | |
1988 | * Returns: Nothing | |
1da177e4 LT |
1989 | */ |
1990 | void scsi_free_host_dev(struct scsi_device *sdev) | |
1991 | { | |
1992 | BUG_ON(sdev->id != sdev->host->this_id); | |
1993 | ||
860dc736 | 1994 | __scsi_remove_device(sdev); |
1da177e4 LT |
1995 | } |
1996 | EXPORT_SYMBOL(scsi_free_host_dev); | |
1997 |