Commit | Line | Data |
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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> |
1da177e4 LT |
36 | |
37 | #include <scsi/scsi.h> | |
beb40487 | 38 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
39 | #include <scsi/scsi_device.h> |
40 | #include <scsi/scsi_driver.h> | |
41 | #include <scsi/scsi_devinfo.h> | |
42 | #include <scsi/scsi_host.h> | |
1da177e4 LT |
43 | #include <scsi/scsi_transport.h> |
44 | #include <scsi/scsi_eh.h> | |
45 | ||
46 | #include "scsi_priv.h" | |
47 | #include "scsi_logging.h" | |
48 | ||
49 | #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \ | |
50 | " SCSI scanning, some SCSI devices might not be configured\n" | |
51 | ||
52 | /* | |
53 | * Default timeout | |
54 | */ | |
55 | #define SCSI_TIMEOUT (2*HZ) | |
56 | ||
57 | /* | |
405ae7d3 | 58 | * Prefix values for the SCSI id's (stored in sysfs name field) |
1da177e4 LT |
59 | */ |
60 | #define SCSI_UID_SER_NUM 'S' | |
61 | #define SCSI_UID_UNKNOWN 'Z' | |
62 | ||
63 | /* | |
64 | * Return values of some of the scanning functions. | |
65 | * | |
66 | * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this | |
67 | * includes allocation or general failures preventing IO from being sent. | |
68 | * | |
69 | * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available | |
70 | * on the given LUN. | |
71 | * | |
72 | * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a | |
73 | * given LUN. | |
74 | */ | |
75 | #define SCSI_SCAN_NO_RESPONSE 0 | |
76 | #define SCSI_SCAN_TARGET_PRESENT 1 | |
77 | #define SCSI_SCAN_LUN_PRESENT 2 | |
78 | ||
0ad78200 | 79 | static const char *scsi_null_device_strs = "nullnullnullnull"; |
1da177e4 LT |
80 | |
81 | #define MAX_SCSI_LUNS 512 | |
82 | ||
83 | #ifdef CONFIG_SCSI_MULTI_LUN | |
84 | static unsigned int max_scsi_luns = MAX_SCSI_LUNS; | |
85 | #else | |
86 | static unsigned int max_scsi_luns = 1; | |
87 | #endif | |
88 | ||
10f4b89a | 89 | module_param_named(max_luns, max_scsi_luns, uint, S_IRUGO|S_IWUSR); |
1da177e4 LT |
90 | MODULE_PARM_DESC(max_luns, |
91 | "last scsi LUN (should be between 1 and 2^32-1)"); | |
92 | ||
21db1882 MW |
93 | #ifdef CONFIG_SCSI_SCAN_ASYNC |
94 | #define SCSI_SCAN_TYPE_DEFAULT "async" | |
95 | #else | |
96 | #define SCSI_SCAN_TYPE_DEFAULT "sync" | |
97 | #endif | |
98 | ||
99 | static char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT; | |
3e082a91 MW |
100 | |
101 | module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO); | |
102 | MODULE_PARM_DESC(scan, "sync, async or none"); | |
103 | ||
1da177e4 LT |
104 | /* |
105 | * max_scsi_report_luns: the maximum number of LUNS that will be | |
106 | * returned from the REPORT LUNS command. 8 times this value must | |
107 | * be allocated. In theory this could be up to an 8 byte value, but | |
108 | * in practice, the maximum number of LUNs suppored by any device | |
109 | * is about 16k. | |
110 | */ | |
111 | static unsigned int max_scsi_report_luns = 511; | |
112 | ||
10f4b89a | 113 | module_param_named(max_report_luns, max_scsi_report_luns, uint, S_IRUGO|S_IWUSR); |
1da177e4 LT |
114 | MODULE_PARM_DESC(max_report_luns, |
115 | "REPORT LUNS maximum number of LUNS received (should be" | |
116 | " between 1 and 16384)"); | |
117 | ||
14faf12f | 118 | static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ + 18; |
1da177e4 | 119 | |
10f4b89a | 120 | module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR); |
1da177e4 LT |
121 | MODULE_PARM_DESC(inq_timeout, |
122 | "Timeout (in seconds) waiting for devices to answer INQUIRY." | |
14faf12f | 123 | " Default is 20. Some devices may need more; most need less."); |
1da177e4 | 124 | |
6b7f123f | 125 | /* This lock protects only this list */ |
3e082a91 MW |
126 | static DEFINE_SPINLOCK(async_scan_lock); |
127 | static LIST_HEAD(scanning_hosts); | |
128 | ||
129 | struct async_scan_data { | |
130 | struct list_head list; | |
131 | struct Scsi_Host *shost; | |
132 | struct completion prev_finished; | |
133 | }; | |
134 | ||
135 | /** | |
136 | * scsi_complete_async_scans - Wait for asynchronous scans to complete | |
137 | * | |
8bcc2412 MW |
138 | * When this function returns, any host which started scanning before |
139 | * this function was called will have finished its scan. Hosts which | |
140 | * started scanning after this function was called may or may not have | |
141 | * finished. | |
3e082a91 MW |
142 | */ |
143 | int scsi_complete_async_scans(void) | |
144 | { | |
145 | struct async_scan_data *data; | |
146 | ||
147 | do { | |
148 | if (list_empty(&scanning_hosts)) | |
149 | return 0; | |
150 | /* If we can't get memory immediately, that's OK. Just | |
151 | * sleep a little. Even if we never get memory, the async | |
152 | * scans will finish eventually. | |
153 | */ | |
154 | data = kmalloc(sizeof(*data), GFP_KERNEL); | |
155 | if (!data) | |
156 | msleep(1); | |
157 | } while (!data); | |
158 | ||
159 | data->shost = NULL; | |
160 | init_completion(&data->prev_finished); | |
161 | ||
162 | spin_lock(&async_scan_lock); | |
163 | /* Check that there's still somebody else on the list */ | |
164 | if (list_empty(&scanning_hosts)) | |
165 | goto done; | |
166 | list_add_tail(&data->list, &scanning_hosts); | |
167 | spin_unlock(&async_scan_lock); | |
168 | ||
169 | printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n"); | |
170 | wait_for_completion(&data->prev_finished); | |
171 | ||
172 | spin_lock(&async_scan_lock); | |
173 | list_del(&data->list); | |
8bcc2412 MW |
174 | if (!list_empty(&scanning_hosts)) { |
175 | struct async_scan_data *next = list_entry(scanning_hosts.next, | |
176 | struct async_scan_data, list); | |
177 | complete(&next->prev_finished); | |
178 | } | |
3e082a91 MW |
179 | done: |
180 | spin_unlock(&async_scan_lock); | |
181 | ||
182 | kfree(data); | |
183 | return 0; | |
184 | } | |
185 | ||
3e082a91 MW |
186 | /* Only exported for the benefit of scsi_wait_scan */ |
187 | EXPORT_SYMBOL_GPL(scsi_complete_async_scans); | |
3e082a91 | 188 | |
f2f027c6 HD |
189 | #ifndef MODULE |
190 | /* | |
191 | * For async scanning we need to wait for all the scans to complete before | |
192 | * trying to mount the root fs. Otherwise non-modular drivers may not be ready | |
193 | * yet. | |
194 | */ | |
195 | late_initcall(scsi_complete_async_scans); | |
196 | #endif | |
197 | ||
1da177e4 LT |
198 | /** |
199 | * scsi_unlock_floptical - unlock device via a special MODE SENSE command | |
39216033 | 200 | * @sdev: scsi device to send command to |
1da177e4 LT |
201 | * @result: area to store the result of the MODE SENSE |
202 | * | |
203 | * Description: | |
39216033 | 204 | * Send a vendor specific MODE SENSE (not a MODE SELECT) command. |
1da177e4 LT |
205 | * Called for BLIST_KEY devices. |
206 | **/ | |
39216033 | 207 | static void scsi_unlock_floptical(struct scsi_device *sdev, |
1da177e4 LT |
208 | unsigned char *result) |
209 | { | |
210 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
211 | ||
212 | printk(KERN_NOTICE "scsi: unlocking floptical drive\n"); | |
213 | scsi_cmd[0] = MODE_SENSE; | |
214 | scsi_cmd[1] = 0; | |
215 | scsi_cmd[2] = 0x2e; | |
216 | scsi_cmd[3] = 0; | |
39216033 | 217 | scsi_cmd[4] = 0x2a; /* size */ |
1da177e4 | 218 | scsi_cmd[5] = 0; |
39216033 | 219 | scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL, |
f4f4e47e | 220 | SCSI_TIMEOUT, 3, NULL); |
1da177e4 LT |
221 | } |
222 | ||
1da177e4 LT |
223 | /** |
224 | * scsi_alloc_sdev - allocate and setup a scsi_Device | |
eb44820c RL |
225 | * @starget: which target to allocate a &scsi_device for |
226 | * @lun: which lun | |
227 | * @hostdata: usually NULL and set by ->slave_alloc instead | |
1da177e4 LT |
228 | * |
229 | * Description: | |
230 | * Allocate, initialize for io, and return a pointer to a scsi_Device. | |
231 | * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and | |
232 | * adds scsi_Device to the appropriate list. | |
233 | * | |
234 | * Return value: | |
235 | * scsi_Device pointer, or NULL on failure. | |
236 | **/ | |
237 | static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, | |
238 | unsigned int lun, void *hostdata) | |
239 | { | |
240 | struct scsi_device *sdev; | |
241 | int display_failure_msg = 1, ret; | |
242 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
a341cd0f | 243 | extern void scsi_evt_thread(struct work_struct *work); |
1da177e4 | 244 | |
24669f75 | 245 | sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size, |
1da177e4 LT |
246 | GFP_ATOMIC); |
247 | if (!sdev) | |
248 | goto out; | |
249 | ||
1da177e4 LT |
250 | sdev->vendor = scsi_null_device_strs; |
251 | sdev->model = scsi_null_device_strs; | |
252 | sdev->rev = scsi_null_device_strs; | |
253 | sdev->host = shost; | |
254 | sdev->id = starget->id; | |
255 | sdev->lun = lun; | |
256 | sdev->channel = starget->channel; | |
257 | sdev->sdev_state = SDEV_CREATED; | |
258 | INIT_LIST_HEAD(&sdev->siblings); | |
259 | INIT_LIST_HEAD(&sdev->same_target_siblings); | |
260 | INIT_LIST_HEAD(&sdev->cmd_list); | |
261 | INIT_LIST_HEAD(&sdev->starved_entry); | |
a341cd0f | 262 | INIT_LIST_HEAD(&sdev->event_list); |
1da177e4 | 263 | spin_lock_init(&sdev->list_lock); |
a341cd0f | 264 | INIT_WORK(&sdev->event_work, scsi_evt_thread); |
1da177e4 LT |
265 | |
266 | sdev->sdev_gendev.parent = get_device(&starget->dev); | |
267 | sdev->sdev_target = starget; | |
268 | ||
269 | /* usually NULL and set by ->slave_alloc instead */ | |
270 | sdev->hostdata = hostdata; | |
271 | ||
272 | /* if the device needs this changing, it may do so in the | |
273 | * slave_configure function */ | |
274 | sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED; | |
275 | ||
276 | /* | |
277 | * Some low level driver could use device->type | |
278 | */ | |
279 | sdev->type = -1; | |
280 | ||
281 | /* | |
282 | * Assume that the device will have handshaking problems, | |
283 | * and then fix this field later if it turns out it | |
284 | * doesn't | |
285 | */ | |
286 | sdev->borken = 1; | |
287 | ||
1da177e4 LT |
288 | sdev->request_queue = scsi_alloc_queue(sdev); |
289 | if (!sdev->request_queue) { | |
290 | /* release fn is set up in scsi_sysfs_device_initialise, so | |
291 | * have to free and put manually here */ | |
292 | put_device(&starget->dev); | |
93f56089 | 293 | kfree(sdev); |
1da177e4 LT |
294 | goto out; |
295 | } | |
296 | ||
297 | sdev->request_queue->queuedata = sdev; | |
298 | scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun); | |
299 | ||
300 | scsi_sysfs_device_initialize(sdev); | |
301 | ||
302 | if (shost->hostt->slave_alloc) { | |
303 | ret = shost->hostt->slave_alloc(sdev); | |
304 | if (ret) { | |
305 | /* | |
306 | * if LLDD reports slave not present, don't clutter | |
307 | * console with alloc failure messages | |
1da177e4 LT |
308 | */ |
309 | if (ret == -ENXIO) | |
310 | display_failure_msg = 0; | |
311 | goto out_device_destroy; | |
312 | } | |
313 | } | |
314 | ||
315 | return sdev; | |
316 | ||
317 | out_device_destroy: | |
c2f9e49f | 318 | scsi_device_set_state(sdev, SDEV_DEL); |
1da177e4 | 319 | transport_destroy_device(&sdev->sdev_gendev); |
1da177e4 LT |
320 | put_device(&sdev->sdev_gendev); |
321 | out: | |
322 | if (display_failure_msg) | |
cadbd4a5 | 323 | printk(ALLOC_FAILURE_MSG, __func__); |
1da177e4 LT |
324 | return NULL; |
325 | } | |
326 | ||
643eb2d9 JB |
327 | static void scsi_target_destroy(struct scsi_target *starget) |
328 | { | |
329 | struct device *dev = &starget->dev; | |
330 | struct Scsi_Host *shost = dev_to_shost(dev->parent); | |
331 | unsigned long flags; | |
332 | ||
333 | transport_destroy_device(dev); | |
334 | spin_lock_irqsave(shost->host_lock, flags); | |
335 | if (shost->hostt->target_destroy) | |
336 | shost->hostt->target_destroy(starget); | |
337 | list_del_init(&starget->siblings); | |
338 | spin_unlock_irqrestore(shost->host_lock, flags); | |
339 | put_device(dev); | |
340 | } | |
341 | ||
1da177e4 LT |
342 | static void scsi_target_dev_release(struct device *dev) |
343 | { | |
344 | struct device *parent = dev->parent; | |
345 | struct scsi_target *starget = to_scsi_target(dev); | |
a283bd37 | 346 | |
1da177e4 LT |
347 | kfree(starget); |
348 | put_device(parent); | |
349 | } | |
350 | ||
453cd0f3 | 351 | static struct device_type scsi_target_type = { |
b0ed4336 HR |
352 | .name = "scsi_target", |
353 | .release = scsi_target_dev_release, | |
354 | }; | |
355 | ||
1da177e4 LT |
356 | int scsi_is_target_device(const struct device *dev) |
357 | { | |
b0ed4336 | 358 | return dev->type == &scsi_target_type; |
1da177e4 LT |
359 | } |
360 | EXPORT_SYMBOL(scsi_is_target_device); | |
361 | ||
362 | static struct scsi_target *__scsi_find_target(struct device *parent, | |
363 | int channel, uint id) | |
364 | { | |
365 | struct scsi_target *starget, *found_starget = NULL; | |
366 | struct Scsi_Host *shost = dev_to_shost(parent); | |
367 | /* | |
368 | * Search for an existing target for this sdev. | |
369 | */ | |
370 | list_for_each_entry(starget, &shost->__targets, siblings) { | |
371 | if (starget->id == id && | |
372 | starget->channel == channel) { | |
373 | found_starget = starget; | |
374 | break; | |
375 | } | |
376 | } | |
377 | if (found_starget) | |
378 | get_device(&found_starget->dev); | |
379 | ||
380 | return found_starget; | |
381 | } | |
382 | ||
884d25cc JB |
383 | /** |
384 | * scsi_alloc_target - allocate a new or find an existing target | |
385 | * @parent: parent of the target (need not be a scsi host) | |
386 | * @channel: target channel number (zero if no channels) | |
387 | * @id: target id number | |
388 | * | |
389 | * Return an existing target if one exists, provided it hasn't already | |
390 | * gone into STARGET_DEL state, otherwise allocate a new target. | |
391 | * | |
392 | * The target is returned with an incremented reference, so the caller | |
393 | * is responsible for both reaping and doing a last put | |
394 | */ | |
1da177e4 LT |
395 | static struct scsi_target *scsi_alloc_target(struct device *parent, |
396 | int channel, uint id) | |
397 | { | |
398 | struct Scsi_Host *shost = dev_to_shost(parent); | |
399 | struct device *dev = NULL; | |
400 | unsigned long flags; | |
401 | const int size = sizeof(struct scsi_target) | |
402 | + shost->transportt->target_size; | |
5c44cd2a | 403 | struct scsi_target *starget; |
1da177e4 | 404 | struct scsi_target *found_target; |
32f95792 | 405 | int error; |
1da177e4 | 406 | |
24669f75 | 407 | starget = kzalloc(size, GFP_KERNEL); |
1da177e4 | 408 | if (!starget) { |
cadbd4a5 | 409 | printk(KERN_ERR "%s: allocation failure\n", __func__); |
1da177e4 LT |
410 | return NULL; |
411 | } | |
1da177e4 LT |
412 | dev = &starget->dev; |
413 | device_initialize(dev); | |
414 | starget->reap_ref = 1; | |
415 | dev->parent = get_device(parent); | |
71610f55 | 416 | dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id); |
b0ed4336 HR |
417 | #ifndef CONFIG_SYSFS_DEPRECATED |
418 | dev->bus = &scsi_bus_type; | |
419 | #endif | |
420 | dev->type = &scsi_target_type; | |
1da177e4 LT |
421 | starget->id = id; |
422 | starget->channel = channel; | |
f0c0a376 | 423 | starget->can_queue = 0; |
1da177e4 LT |
424 | INIT_LIST_HEAD(&starget->siblings); |
425 | INIT_LIST_HEAD(&starget->devices); | |
643eb2d9 | 426 | starget->state = STARGET_CREATED; |
7c9d6f16 | 427 | starget->scsi_level = SCSI_2; |
c53a284f | 428 | starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED; |
ffedb452 | 429 | retry: |
1da177e4 LT |
430 | spin_lock_irqsave(shost->host_lock, flags); |
431 | ||
432 | found_target = __scsi_find_target(parent, channel, id); | |
433 | if (found_target) | |
434 | goto found; | |
435 | ||
436 | list_add_tail(&starget->siblings, &shost->__targets); | |
437 | spin_unlock_irqrestore(shost->host_lock, flags); | |
438 | /* allocate and add */ | |
a283bd37 | 439 | transport_setup_device(dev); |
a283bd37 | 440 | if (shost->hostt->target_alloc) { |
32f95792 | 441 | error = shost->hostt->target_alloc(starget); |
a283bd37 JB |
442 | |
443 | if(error) { | |
444 | dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error); | |
445 | /* don't want scsi_target_reap to do the final | |
446 | * put because it will be under the host lock */ | |
643eb2d9 | 447 | scsi_target_destroy(starget); |
a283bd37 JB |
448 | return NULL; |
449 | } | |
450 | } | |
884d25cc | 451 | get_device(dev); |
a283bd37 | 452 | |
1da177e4 LT |
453 | return starget; |
454 | ||
455 | found: | |
456 | found_target->reap_ref++; | |
457 | spin_unlock_irqrestore(shost->host_lock, flags); | |
ffedb452 | 458 | if (found_target->state != STARGET_DEL) { |
884d25cc | 459 | put_device(parent); |
ffedb452 JB |
460 | kfree(starget); |
461 | return found_target; | |
462 | } | |
463 | /* Unfortunately, we found a dying target; need to | |
464 | * wait until it's dead before we can get a new one */ | |
465 | put_device(&found_target->dev); | |
466 | flush_scheduled_work(); | |
467 | goto retry; | |
1da177e4 LT |
468 | } |
469 | ||
65f27f38 | 470 | static void scsi_target_reap_usercontext(struct work_struct *work) |
65110b21 | 471 | { |
65f27f38 DH |
472 | struct scsi_target *starget = |
473 | container_of(work, struct scsi_target, ew.work); | |
863a930a | 474 | |
ffedb452 JB |
475 | transport_remove_device(&starget->dev); |
476 | device_del(&starget->dev); | |
643eb2d9 | 477 | scsi_target_destroy(starget); |
863a930a JB |
478 | } |
479 | ||
1da177e4 LT |
480 | /** |
481 | * scsi_target_reap - check to see if target is in use and destroy if not | |
1da177e4 LT |
482 | * @starget: target to be checked |
483 | * | |
484 | * This is used after removing a LUN or doing a last put of the target | |
485 | * it checks atomically that nothing is using the target and removes | |
486 | * it if so. | |
487 | */ | |
488 | void scsi_target_reap(struct scsi_target *starget) | |
489 | { | |
ffedb452 JB |
490 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
491 | unsigned long flags; | |
643eb2d9 JB |
492 | enum scsi_target_state state; |
493 | int empty; | |
ffedb452 JB |
494 | |
495 | spin_lock_irqsave(shost->host_lock, flags); | |
643eb2d9 JB |
496 | state = starget->state; |
497 | empty = --starget->reap_ref == 0 && | |
498 | list_empty(&starget->devices) ? 1 : 0; | |
499 | spin_unlock_irqrestore(shost->host_lock, flags); | |
ffedb452 | 500 | |
643eb2d9 | 501 | if (!empty) |
ffedb452 JB |
502 | return; |
503 | ||
643eb2d9 JB |
504 | BUG_ON(state == STARGET_DEL); |
505 | starget->state = STARGET_DEL; | |
506 | if (state == STARGET_CREATED) | |
507 | scsi_target_destroy(starget); | |
508 | else | |
509 | execute_in_process_context(scsi_target_reap_usercontext, | |
510 | &starget->ew); | |
1da177e4 LT |
511 | } |
512 | ||
e5b3cd42 AS |
513 | /** |
514 | * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string | |
515 | * @s: INQUIRY result string to sanitize | |
516 | * @len: length of the string | |
517 | * | |
518 | * Description: | |
519 | * The SCSI spec says that INQUIRY vendor, product, and revision | |
520 | * strings must consist entirely of graphic ASCII characters, | |
521 | * padded on the right with spaces. Since not all devices obey | |
522 | * this rule, we will replace non-graphic or non-ASCII characters | |
523 | * with spaces. Exception: a NUL character is interpreted as a | |
524 | * string terminator, so all the following characters are set to | |
525 | * spaces. | |
526 | **/ | |
527 | static void sanitize_inquiry_string(unsigned char *s, int len) | |
528 | { | |
529 | int terminated = 0; | |
530 | ||
531 | for (; len > 0; (--len, ++s)) { | |
532 | if (*s == 0) | |
533 | terminated = 1; | |
534 | if (terminated || *s < 0x20 || *s > 0x7e) | |
535 | *s = ' '; | |
536 | } | |
537 | } | |
538 | ||
1da177e4 LT |
539 | /** |
540 | * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY | |
39216033 | 541 | * @sdev: scsi_device to probe |
1da177e4 | 542 | * @inq_result: area to store the INQUIRY result |
39216033 | 543 | * @result_len: len of inq_result |
1da177e4 LT |
544 | * @bflags: store any bflags found here |
545 | * | |
546 | * Description: | |
39216033 | 547 | * Probe the lun associated with @req using a standard SCSI INQUIRY; |
1da177e4 | 548 | * |
39216033 | 549 | * If the INQUIRY is successful, zero is returned and the |
1da177e4 | 550 | * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length |
f64a181d | 551 | * are copied to the scsi_device any flags value is stored in *@bflags. |
1da177e4 | 552 | **/ |
e5b3cd42 | 553 | static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result, |
39216033 | 554 | int result_len, int *bflags) |
1da177e4 | 555 | { |
1da177e4 LT |
556 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
557 | int first_inquiry_len, try_inquiry_len, next_inquiry_len; | |
558 | int response_len = 0; | |
39216033 | 559 | int pass, count, result; |
1da177e4 LT |
560 | struct scsi_sense_hdr sshdr; |
561 | ||
562 | *bflags = 0; | |
563 | ||
564 | /* Perform up to 3 passes. The first pass uses a conservative | |
565 | * transfer length of 36 unless sdev->inquiry_len specifies a | |
566 | * different value. */ | |
567 | first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36; | |
568 | try_inquiry_len = first_inquiry_len; | |
569 | pass = 1; | |
570 | ||
571 | next_pass: | |
9ccfc756 JB |
572 | SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
573 | "scsi scan: INQUIRY pass %d length %d\n", | |
574 | pass, try_inquiry_len)); | |
1da177e4 LT |
575 | |
576 | /* Each pass gets up to three chances to ignore Unit Attention */ | |
577 | for (count = 0; count < 3; ++count) { | |
5cd3bbfa FT |
578 | int resid; |
579 | ||
1da177e4 LT |
580 | memset(scsi_cmd, 0, 6); |
581 | scsi_cmd[0] = INQUIRY; | |
582 | scsi_cmd[4] = (unsigned char) try_inquiry_len; | |
1da177e4 LT |
583 | |
584 | memset(inq_result, 0, try_inquiry_len); | |
39216033 JB |
585 | |
586 | result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, | |
ea73a9f2 | 587 | inq_result, try_inquiry_len, &sshdr, |
f4f4e47e | 588 | HZ / 2 + HZ * scsi_inq_timeout, 3, |
5cd3bbfa | 589 | &resid); |
1da177e4 LT |
590 | |
591 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s " | |
592 | "with code 0x%x\n", | |
39216033 | 593 | result ? "failed" : "successful", result)); |
1da177e4 | 594 | |
39216033 | 595 | if (result) { |
1da177e4 LT |
596 | /* |
597 | * not-ready to ready transition [asc/ascq=0x28/0x0] | |
598 | * or power-on, reset [asc/ascq=0x29/0x0], continue. | |
599 | * INQUIRY should not yield UNIT_ATTENTION | |
600 | * but many buggy devices do so anyway. | |
601 | */ | |
39216033 | 602 | if ((driver_byte(result) & DRIVER_SENSE) && |
ea73a9f2 | 603 | scsi_sense_valid(&sshdr)) { |
1da177e4 LT |
604 | if ((sshdr.sense_key == UNIT_ATTENTION) && |
605 | ((sshdr.asc == 0x28) || | |
606 | (sshdr.asc == 0x29)) && | |
607 | (sshdr.ascq == 0)) | |
608 | continue; | |
609 | } | |
5cd3bbfa FT |
610 | } else { |
611 | /* | |
612 | * if nothing was transferred, we try | |
613 | * again. It's a workaround for some USB | |
614 | * devices. | |
615 | */ | |
616 | if (resid == try_inquiry_len) | |
617 | continue; | |
1da177e4 LT |
618 | } |
619 | break; | |
620 | } | |
621 | ||
39216033 | 622 | if (result == 0) { |
e5b3cd42 AS |
623 | sanitize_inquiry_string(&inq_result[8], 8); |
624 | sanitize_inquiry_string(&inq_result[16], 16); | |
625 | sanitize_inquiry_string(&inq_result[32], 4); | |
626 | ||
627 | response_len = inq_result[4] + 5; | |
1da177e4 LT |
628 | if (response_len > 255) |
629 | response_len = first_inquiry_len; /* sanity */ | |
630 | ||
631 | /* | |
632 | * Get any flags for this device. | |
633 | * | |
f64a181d CH |
634 | * XXX add a bflags to scsi_device, and replace the |
635 | * corresponding bit fields in scsi_device, so bflags | |
1da177e4 LT |
636 | * need not be passed as an argument. |
637 | */ | |
638 | *bflags = scsi_get_device_flags(sdev, &inq_result[8], | |
639 | &inq_result[16]); | |
640 | ||
641 | /* When the first pass succeeds we gain information about | |
642 | * what larger transfer lengths might work. */ | |
643 | if (pass == 1) { | |
644 | if (BLIST_INQUIRY_36 & *bflags) | |
645 | next_inquiry_len = 36; | |
646 | else if (BLIST_INQUIRY_58 & *bflags) | |
647 | next_inquiry_len = 58; | |
648 | else if (sdev->inquiry_len) | |
649 | next_inquiry_len = sdev->inquiry_len; | |
650 | else | |
651 | next_inquiry_len = response_len; | |
652 | ||
653 | /* If more data is available perform the second pass */ | |
654 | if (next_inquiry_len > try_inquiry_len) { | |
655 | try_inquiry_len = next_inquiry_len; | |
656 | pass = 2; | |
657 | goto next_pass; | |
658 | } | |
659 | } | |
660 | ||
661 | } else if (pass == 2) { | |
662 | printk(KERN_INFO "scsi scan: %d byte inquiry failed. " | |
663 | "Consider BLIST_INQUIRY_36 for this device\n", | |
664 | try_inquiry_len); | |
665 | ||
666 | /* If this pass failed, the third pass goes back and transfers | |
667 | * the same amount as we successfully got in the first pass. */ | |
668 | try_inquiry_len = first_inquiry_len; | |
669 | pass = 3; | |
670 | goto next_pass; | |
671 | } | |
672 | ||
673 | /* If the last transfer attempt got an error, assume the | |
674 | * peripheral doesn't exist or is dead. */ | |
39216033 JB |
675 | if (result) |
676 | return -EIO; | |
1da177e4 LT |
677 | |
678 | /* Don't report any more data than the device says is valid */ | |
679 | sdev->inquiry_len = min(try_inquiry_len, response_len); | |
680 | ||
681 | /* | |
682 | * XXX Abort if the response length is less than 36? If less than | |
683 | * 32, the lookup of the device flags (above) could be invalid, | |
684 | * and it would be possible to take an incorrect action - we do | |
685 | * not want to hang because of a short INQUIRY. On the flip side, | |
686 | * if the device is spun down or becoming ready (and so it gives a | |
687 | * short INQUIRY), an abort here prevents any further use of the | |
688 | * device, including spin up. | |
689 | * | |
e423ee31 AS |
690 | * On the whole, the best approach seems to be to assume the first |
691 | * 36 bytes are valid no matter what the device says. That's | |
692 | * better than copying < 36 bytes to the inquiry-result buffer | |
693 | * and displaying garbage for the Vendor, Product, or Revision | |
694 | * strings. | |
695 | */ | |
696 | if (sdev->inquiry_len < 36) { | |
697 | printk(KERN_INFO "scsi scan: INQUIRY result too short (%d)," | |
698 | " using 36\n", sdev->inquiry_len); | |
699 | sdev->inquiry_len = 36; | |
700 | } | |
701 | ||
702 | /* | |
1da177e4 LT |
703 | * Related to the above issue: |
704 | * | |
705 | * XXX Devices (disk or all?) should be sent a TEST UNIT READY, | |
706 | * and if not ready, sent a START_STOP to start (maybe spin up) and | |
707 | * then send the INQUIRY again, since the INQUIRY can change after | |
708 | * a device is initialized. | |
709 | * | |
710 | * Ideally, start a device if explicitly asked to do so. This | |
711 | * assumes that a device is spun up on power on, spun down on | |
712 | * request, and then spun up on request. | |
713 | */ | |
714 | ||
715 | /* | |
716 | * The scanning code needs to know the scsi_level, even if no | |
717 | * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so | |
718 | * non-zero LUNs can be scanned. | |
719 | */ | |
720 | sdev->scsi_level = inq_result[2] & 0x07; | |
721 | if (sdev->scsi_level >= 2 || | |
722 | (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1)) | |
723 | sdev->scsi_level++; | |
6f3a2024 | 724 | sdev->sdev_target->scsi_level = sdev->scsi_level; |
1da177e4 | 725 | |
39216033 | 726 | return 0; |
1da177e4 LT |
727 | } |
728 | ||
729 | /** | |
f64a181d | 730 | * scsi_add_lun - allocate and fully initialze a scsi_device |
6d877688 | 731 | * @sdev: holds information to be stored in the new scsi_device |
1da177e4 LT |
732 | * @inq_result: holds the result of a previous INQUIRY to the LUN |
733 | * @bflags: black/white list flag | |
6d877688 | 734 | * @async: 1 if this device is being scanned asynchronously |
1da177e4 LT |
735 | * |
736 | * Description: | |
6d877688 MW |
737 | * Initialize the scsi_device @sdev. Optionally set fields based |
738 | * on values in *@bflags. | |
1da177e4 LT |
739 | * |
740 | * Return: | |
f64a181d CH |
741 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device |
742 | * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized | |
1da177e4 | 743 | **/ |
e5b3cd42 | 744 | static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, |
3e082a91 | 745 | int *bflags, int async) |
1da177e4 | 746 | { |
6f4267e3 JB |
747 | int ret; |
748 | ||
1da177e4 LT |
749 | /* |
750 | * XXX do not save the inquiry, since it can change underneath us, | |
751 | * save just vendor/model/rev. | |
752 | * | |
753 | * Rather than save it and have an ioctl that retrieves the saved | |
754 | * value, have an ioctl that executes the same INQUIRY code used | |
755 | * in scsi_probe_lun, let user level programs doing INQUIRY | |
756 | * scanning run at their own risk, or supply a user level program | |
757 | * that can correctly scan. | |
758 | */ | |
09123d23 AS |
759 | |
760 | /* | |
761 | * Copy at least 36 bytes of INQUIRY data, so that we don't | |
762 | * dereference unallocated memory when accessing the Vendor, | |
763 | * Product, and Revision strings. Badly behaved devices may set | |
764 | * the INQUIRY Additional Length byte to a small value, indicating | |
765 | * these strings are invalid, but often they contain plausible data | |
766 | * nonetheless. It doesn't matter if the device sent < 36 bytes | |
767 | * total, since scsi_probe_lun() initializes inq_result with 0s. | |
768 | */ | |
769 | sdev->inquiry = kmemdup(inq_result, | |
770 | max_t(size_t, sdev->inquiry_len, 36), | |
771 | GFP_ATOMIC); | |
772 | if (sdev->inquiry == NULL) | |
1da177e4 | 773 | return SCSI_SCAN_NO_RESPONSE; |
1da177e4 | 774 | |
1da177e4 LT |
775 | sdev->vendor = (char *) (sdev->inquiry + 8); |
776 | sdev->model = (char *) (sdev->inquiry + 16); | |
777 | sdev->rev = (char *) (sdev->inquiry + 32); | |
778 | ||
779 | if (*bflags & BLIST_ISROM) { | |
6d877688 MW |
780 | sdev->type = TYPE_ROM; |
781 | sdev->removable = 1; | |
782 | } else { | |
783 | sdev->type = (inq_result[0] & 0x1f); | |
784 | sdev->removable = (inq_result[1] & 0x80) >> 7; | |
785 | } | |
1da177e4 | 786 | |
6d877688 | 787 | switch (sdev->type) { |
ddaf6fc8 | 788 | case TYPE_RBC: |
1da177e4 LT |
789 | case TYPE_TAPE: |
790 | case TYPE_DISK: | |
791 | case TYPE_PRINTER: | |
792 | case TYPE_MOD: | |
793 | case TYPE_PROCESSOR: | |
794 | case TYPE_SCANNER: | |
795 | case TYPE_MEDIUM_CHANGER: | |
796 | case TYPE_ENCLOSURE: | |
797 | case TYPE_COMM: | |
4d7db04a | 798 | case TYPE_RAID: |
82443a58 | 799 | case TYPE_OSD: |
1da177e4 LT |
800 | sdev->writeable = 1; |
801 | break; | |
1da177e4 | 802 | case TYPE_ROM: |
ddaf6fc8 | 803 | case TYPE_WORM: |
1da177e4 LT |
804 | sdev->writeable = 0; |
805 | break; | |
806 | default: | |
807 | printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type); | |
808 | } | |
809 | ||
6d877688 MW |
810 | if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) { |
811 | /* RBC and MMC devices can return SCSI-3 compliance and yet | |
812 | * still not support REPORT LUNS, so make them act as | |
813 | * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is | |
814 | * specifically set */ | |
815 | if ((*bflags & BLIST_REPORTLUN2) == 0) | |
816 | *bflags |= BLIST_NOREPORTLUN; | |
817 | } | |
818 | ||
1da177e4 LT |
819 | /* |
820 | * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI | |
821 | * spec says: The device server is capable of supporting the | |
822 | * specified peripheral device type on this logical unit. However, | |
823 | * the physical device is not currently connected to this logical | |
824 | * unit. | |
825 | * | |
826 | * The above is vague, as it implies that we could treat 001 and | |
827 | * 011 the same. Stay compatible with previous code, and create a | |
f64a181d | 828 | * scsi_device for a PQ of 1 |
1da177e4 LT |
829 | * |
830 | * Don't set the device offline here; rather let the upper | |
831 | * level drivers eval the PQ to decide whether they should | |
832 | * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check. | |
833 | */ | |
834 | ||
835 | sdev->inq_periph_qual = (inq_result[0] >> 5) & 7; | |
1da177e4 LT |
836 | sdev->lockable = sdev->removable; |
837 | sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2); | |
838 | ||
6d877688 MW |
839 | if (sdev->scsi_level >= SCSI_3 || |
840 | (sdev->inquiry_len > 56 && inq_result[56] & 0x04)) | |
1da177e4 LT |
841 | sdev->ppr = 1; |
842 | if (inq_result[7] & 0x60) | |
843 | sdev->wdtr = 1; | |
844 | if (inq_result[7] & 0x10) | |
845 | sdev->sdtr = 1; | |
846 | ||
19ac0db3 | 847 | sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d " |
4ff36718 MW |
848 | "ANSI: %d%s\n", scsi_device_type(sdev->type), |
849 | sdev->vendor, sdev->model, sdev->rev, | |
850 | sdev->inq_periph_qual, inq_result[2] & 0x07, | |
851 | (inq_result[3] & 0x0f) == 1 ? " CCS" : ""); | |
852 | ||
1da177e4 LT |
853 | if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) && |
854 | !(*bflags & BLIST_NOTQ)) | |
855 | sdev->tagged_supported = 1; | |
6d877688 | 856 | |
1da177e4 LT |
857 | /* |
858 | * Some devices (Texel CD ROM drives) have handshaking problems | |
859 | * when used with the Seagate controllers. borken is initialized | |
860 | * to 1, and then set it to 0 here. | |
861 | */ | |
862 | if ((*bflags & BLIST_BORKEN) == 0) | |
863 | sdev->borken = 0; | |
864 | ||
6d877688 MW |
865 | if (*bflags & BLIST_NO_ULD_ATTACH) |
866 | sdev->no_uld_attach = 1; | |
867 | ||
1da177e4 LT |
868 | /* |
869 | * Apparently some really broken devices (contrary to the SCSI | |
870 | * standards) need to be selected without asserting ATN | |
871 | */ | |
872 | if (*bflags & BLIST_SELECT_NO_ATN) | |
873 | sdev->select_no_atn = 1; | |
874 | ||
4d7db04a JB |
875 | /* |
876 | * Maximum 512 sector transfer length | |
877 | * broken RA4x00 Compaq Disk Array | |
878 | */ | |
879 | if (*bflags & BLIST_MAX_512) | |
880 | blk_queue_max_sectors(sdev->request_queue, 512); | |
881 | ||
1da177e4 LT |
882 | /* |
883 | * Some devices may not want to have a start command automatically | |
884 | * issued when a device is added. | |
885 | */ | |
886 | if (*bflags & BLIST_NOSTARTONADD) | |
887 | sdev->no_start_on_add = 1; | |
888 | ||
889 | if (*bflags & BLIST_SINGLELUN) | |
25d7c363 | 890 | scsi_target(sdev)->single_lun = 1; |
1da177e4 | 891 | |
1da177e4 LT |
892 | sdev->use_10_for_rw = 1; |
893 | ||
894 | if (*bflags & BLIST_MS_SKIP_PAGE_08) | |
895 | sdev->skip_ms_page_8 = 1; | |
896 | ||
897 | if (*bflags & BLIST_MS_SKIP_PAGE_3F) | |
898 | sdev->skip_ms_page_3f = 1; | |
899 | ||
900 | if (*bflags & BLIST_USE_10_BYTE_MS) | |
901 | sdev->use_10_for_ms = 1; | |
902 | ||
903 | /* set the device running here so that slave configure | |
904 | * may do I/O */ | |
6f4267e3 JB |
905 | ret = scsi_device_set_state(sdev, SDEV_RUNNING); |
906 | if (ret) { | |
907 | ret = scsi_device_set_state(sdev, SDEV_BLOCK); | |
908 | ||
909 | if (ret) { | |
910 | sdev_printk(KERN_ERR, sdev, | |
911 | "in wrong state %s to complete scan\n", | |
912 | scsi_device_state_name(sdev->sdev_state)); | |
913 | return SCSI_SCAN_NO_RESPONSE; | |
914 | } | |
915 | } | |
1da177e4 LT |
916 | |
917 | if (*bflags & BLIST_MS_192_BYTES_FOR_3F) | |
918 | sdev->use_192_bytes_for_3f = 1; | |
919 | ||
920 | if (*bflags & BLIST_NOT_LOCKABLE) | |
921 | sdev->lockable = 0; | |
922 | ||
923 | if (*bflags & BLIST_RETRY_HWERROR) | |
924 | sdev->retry_hwerror = 1; | |
925 | ||
926 | transport_configure_device(&sdev->sdev_gendev); | |
927 | ||
93805091 | 928 | if (sdev->host->hostt->slave_configure) { |
6f4267e3 | 929 | ret = sdev->host->hostt->slave_configure(sdev); |
93805091 CH |
930 | if (ret) { |
931 | /* | |
932 | * if LLDD reports slave not present, don't clutter | |
933 | * console with alloc failure messages | |
934 | */ | |
935 | if (ret != -ENXIO) { | |
936 | sdev_printk(KERN_ERR, sdev, | |
937 | "failed to configure device\n"); | |
938 | } | |
939 | return SCSI_SCAN_NO_RESPONSE; | |
940 | } | |
941 | } | |
1da177e4 LT |
942 | |
943 | /* | |
944 | * Ok, the device is now all set up, we can | |
945 | * register it and tell the rest of the kernel | |
946 | * about it. | |
947 | */ | |
3e082a91 | 948 | if (!async && scsi_sysfs_add_sdev(sdev) != 0) |
b24b1033 | 949 | return SCSI_SCAN_NO_RESPONSE; |
1da177e4 LT |
950 | |
951 | return SCSI_SCAN_LUN_PRESENT; | |
952 | } | |
953 | ||
6f3a2024 JB |
954 | static inline void scsi_destroy_sdev(struct scsi_device *sdev) |
955 | { | |
309bd271 | 956 | scsi_device_set_state(sdev, SDEV_DEL); |
6f3a2024 JB |
957 | if (sdev->host->hostt->slave_destroy) |
958 | sdev->host->hostt->slave_destroy(sdev); | |
959 | transport_destroy_device(&sdev->sdev_gendev); | |
960 | put_device(&sdev->sdev_gendev); | |
961 | } | |
962 | ||
c5f2e640 | 963 | #ifdef CONFIG_SCSI_LOGGING |
6c7154c9 | 964 | /** |
eb44820c | 965 | * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace |
6c7154c9 KG |
966 | * @buf: Output buffer with at least end-first+1 bytes of space |
967 | * @inq: Inquiry buffer (input) | |
968 | * @first: Offset of string into inq | |
969 | * @end: Index after last character in inq | |
970 | */ | |
c5f2e640 | 971 | static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq, |
6c7154c9 KG |
972 | unsigned first, unsigned end) |
973 | { | |
974 | unsigned term = 0, idx; | |
c5f2e640 | 975 | |
976 | for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) { | |
977 | if (inq[idx+first] > ' ') { | |
6c7154c9 KG |
978 | buf[idx] = inq[idx+first]; |
979 | term = idx+1; | |
980 | } else { | |
981 | buf[idx] = ' '; | |
982 | } | |
983 | } | |
984 | buf[term] = 0; | |
985 | return buf; | |
986 | } | |
c5f2e640 | 987 | #endif |
6f3a2024 | 988 | |
1da177e4 LT |
989 | /** |
990 | * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it | |
991 | * @starget: pointer to target device structure | |
992 | * @lun: LUN of target device | |
1da177e4 | 993 | * @bflagsp: store bflags here if not NULL |
eb44820c RL |
994 | * @sdevp: probe the LUN corresponding to this scsi_device |
995 | * @rescan: if nonzero skip some code only needed on first scan | |
996 | * @hostdata: passed to scsi_alloc_sdev() | |
1da177e4 LT |
997 | * |
998 | * Description: | |
999 | * Call scsi_probe_lun, if a LUN with an attached device is found, | |
1000 | * allocate and set it up by calling scsi_add_lun. | |
1001 | * | |
1002 | * Return: | |
f64a181d | 1003 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device |
1da177e4 LT |
1004 | * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is |
1005 | * attached at the LUN | |
f64a181d | 1006 | * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized |
1da177e4 LT |
1007 | **/ |
1008 | static int scsi_probe_and_add_lun(struct scsi_target *starget, | |
1009 | uint lun, int *bflagsp, | |
1010 | struct scsi_device **sdevp, int rescan, | |
1011 | void *hostdata) | |
1012 | { | |
1013 | struct scsi_device *sdev; | |
1da177e4 | 1014 | unsigned char *result; |
39216033 | 1015 | int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256; |
1da177e4 LT |
1016 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
1017 | ||
1018 | /* | |
1019 | * The rescan flag is used as an optimization, the first scan of a | |
1020 | * host adapter calls into here with rescan == 0. | |
1021 | */ | |
6f3a2024 JB |
1022 | sdev = scsi_device_lookup_by_target(starget, lun); |
1023 | if (sdev) { | |
0f1d87a2 | 1024 | if (rescan || !scsi_device_created(sdev)) { |
1da177e4 LT |
1025 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO |
1026 | "scsi scan: device exists on %s\n", | |
71610f55 | 1027 | dev_name(&sdev->sdev_gendev))); |
1da177e4 LT |
1028 | if (sdevp) |
1029 | *sdevp = sdev; | |
1030 | else | |
1031 | scsi_device_put(sdev); | |
1032 | ||
1033 | if (bflagsp) | |
1034 | *bflagsp = scsi_get_device_flags(sdev, | |
1035 | sdev->vendor, | |
1036 | sdev->model); | |
1037 | return SCSI_SCAN_LUN_PRESENT; | |
1038 | } | |
6f3a2024 JB |
1039 | scsi_device_put(sdev); |
1040 | } else | |
1041 | sdev = scsi_alloc_sdev(starget, lun, hostdata); | |
1da177e4 LT |
1042 | if (!sdev) |
1043 | goto out; | |
39216033 JB |
1044 | |
1045 | result = kmalloc(result_len, GFP_ATOMIC | | |
bc86120a | 1046 | ((shost->unchecked_isa_dma) ? __GFP_DMA : 0)); |
1da177e4 | 1047 | if (!result) |
39216033 | 1048 | goto out_free_sdev; |
1da177e4 | 1049 | |
39216033 | 1050 | if (scsi_probe_lun(sdev, result, result_len, &bflags)) |
1da177e4 LT |
1051 | goto out_free_result; |
1052 | ||
4186ab19 KG |
1053 | if (bflagsp) |
1054 | *bflagsp = bflags; | |
1da177e4 LT |
1055 | /* |
1056 | * result contains valid SCSI INQUIRY data. | |
1057 | */ | |
13f7e5ac | 1058 | if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) { |
1da177e4 LT |
1059 | /* |
1060 | * For a Peripheral qualifier 3 (011b), the SCSI | |
1061 | * spec says: The device server is not capable of | |
1062 | * supporting a physical device on this logical | |
1063 | * unit. | |
1064 | * | |
1065 | * For disks, this implies that there is no | |
1066 | * logical disk configured at sdev->lun, but there | |
1067 | * is a target id responding. | |
1068 | */ | |
6c7154c9 KG |
1069 | SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:" |
1070 | " peripheral qualifier of 3, device not" | |
1071 | " added\n")) | |
1072 | if (lun == 0) { | |
c5f2e640 | 1073 | SCSI_LOG_SCAN_BUS(1, { |
1074 | unsigned char vend[9]; | |
1075 | unsigned char mod[17]; | |
1076 | ||
1077 | sdev_printk(KERN_INFO, sdev, | |
6c7154c9 | 1078 | "scsi scan: consider passing scsi_mod." |
3424a65d | 1079 | "dev_flags=%s:%s:0x240 or 0x1000240\n", |
6c7154c9 | 1080 | scsi_inq_str(vend, result, 8, 16), |
c5f2e640 | 1081 | scsi_inq_str(mod, result, 16, 32)); |
1082 | }); | |
643eb2d9 | 1083 | |
6c7154c9 | 1084 | } |
643eb2d9 | 1085 | |
1da177e4 LT |
1086 | res = SCSI_SCAN_TARGET_PRESENT; |
1087 | goto out_free_result; | |
1088 | } | |
1089 | ||
1bfc5d9d | 1090 | /* |
84961f28 | 1091 | * Some targets may set slight variations of PQ and PDT to signal |
1092 | * that no LUN is present, so don't add sdev in these cases. | |
1093 | * Two specific examples are: | |
1094 | * 1) NetApp targets: return PQ=1, PDT=0x1f | |
1095 | * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved" | |
1096 | * in the UFI 1.0 spec (we cannot rely on reserved bits). | |
1097 | * | |
1098 | * References: | |
1099 | * 1) SCSI SPC-3, pp. 145-146 | |
1100 | * PQ=1: "A peripheral device having the specified peripheral | |
1101 | * device type is not connected to this logical unit. However, the | |
1102 | * device server is capable of supporting the specified peripheral | |
1103 | * device type on this logical unit." | |
1104 | * PDT=0x1f: "Unknown or no device type" | |
1105 | * 2) USB UFI 1.0, p. 20 | |
1106 | * PDT=00h Direct-access device (floppy) | |
1107 | * PDT=1Fh none (no FDD connected to the requested logical unit) | |
1bfc5d9d | 1108 | */ |
84961f28 | 1109 | if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) && |
01b291bd JB |
1110 | (result[0] & 0x1f) == 0x1f && |
1111 | !scsi_is_wlun(lun)) { | |
1bfc5d9d AS |
1112 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO |
1113 | "scsi scan: peripheral device type" | |
1114 | " of 31, no device added\n")); | |
1115 | res = SCSI_SCAN_TARGET_PRESENT; | |
1116 | goto out_free_result; | |
1117 | } | |
1118 | ||
3e082a91 | 1119 | res = scsi_add_lun(sdev, result, &bflags, shost->async_scan); |
1da177e4 LT |
1120 | if (res == SCSI_SCAN_LUN_PRESENT) { |
1121 | if (bflags & BLIST_KEY) { | |
1122 | sdev->lockable = 0; | |
39216033 | 1123 | scsi_unlock_floptical(sdev, result); |
1da177e4 | 1124 | } |
1da177e4 LT |
1125 | } |
1126 | ||
1127 | out_free_result: | |
1128 | kfree(result); | |
1da177e4 LT |
1129 | out_free_sdev: |
1130 | if (res == SCSI_SCAN_LUN_PRESENT) { | |
1131 | if (sdevp) { | |
b70d37bf AS |
1132 | if (scsi_device_get(sdev) == 0) { |
1133 | *sdevp = sdev; | |
1134 | } else { | |
1135 | __scsi_remove_device(sdev); | |
1136 | res = SCSI_SCAN_NO_RESPONSE; | |
1137 | } | |
1da177e4 | 1138 | } |
6f3a2024 JB |
1139 | } else |
1140 | scsi_destroy_sdev(sdev); | |
1da177e4 LT |
1141 | out: |
1142 | return res; | |
1143 | } | |
1144 | ||
1145 | /** | |
1146 | * scsi_sequential_lun_scan - sequentially scan a SCSI target | |
1147 | * @starget: pointer to target structure to scan | |
1148 | * @bflags: black/white list flag for LUN 0 | |
eb44820c RL |
1149 | * @scsi_level: Which version of the standard does this device adhere to |
1150 | * @rescan: passed to scsi_probe_add_lun() | |
1da177e4 LT |
1151 | * |
1152 | * Description: | |
1153 | * Generally, scan from LUN 1 (LUN 0 is assumed to already have been | |
1154 | * scanned) to some maximum lun until a LUN is found with no device | |
1155 | * attached. Use the bflags to figure out any oddities. | |
1156 | * | |
1157 | * Modifies sdevscan->lun. | |
1158 | **/ | |
1159 | static void scsi_sequential_lun_scan(struct scsi_target *starget, | |
4186ab19 | 1160 | int bflags, int scsi_level, int rescan) |
1da177e4 LT |
1161 | { |
1162 | unsigned int sparse_lun, lun, max_dev_lun; | |
1163 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
1164 | ||
1165 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of" | |
71610f55 | 1166 | "%s\n", dev_name(&starget->dev))); |
1da177e4 LT |
1167 | |
1168 | max_dev_lun = min(max_scsi_luns, shost->max_lun); | |
1169 | /* | |
1170 | * If this device is known to support sparse multiple units, | |
1171 | * override the other settings, and scan all of them. Normally, | |
1172 | * SCSI-3 devices should be scanned via the REPORT LUNS. | |
1173 | */ | |
1174 | if (bflags & BLIST_SPARSELUN) { | |
1175 | max_dev_lun = shost->max_lun; | |
1176 | sparse_lun = 1; | |
1177 | } else | |
1178 | sparse_lun = 0; | |
1179 | ||
1da177e4 LT |
1180 | /* |
1181 | * If less than SCSI_1_CSS, and no special lun scaning, stop | |
1182 | * scanning; this matches 2.4 behaviour, but could just be a bug | |
1183 | * (to continue scanning a SCSI_1_CSS device). | |
1184 | * | |
1185 | * This test is broken. We might not have any device on lun0 for | |
1186 | * a sparselun device, and if that's the case then how would we | |
1187 | * know the real scsi_level, eh? It might make sense to just not | |
1188 | * scan any SCSI_1 device for non-0 luns, but that check would best | |
1189 | * go into scsi_alloc_sdev() and just have it return null when asked | |
1190 | * to alloc an sdev for lun > 0 on an already found SCSI_1 device. | |
1191 | * | |
1192 | if ((sdevscan->scsi_level < SCSI_1_CCS) && | |
1193 | ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN)) | |
1194 | == 0)) | |
1195 | return; | |
1196 | */ | |
1197 | /* | |
1198 | * If this device is known to support multiple units, override | |
1199 | * the other settings, and scan all of them. | |
1200 | */ | |
1201 | if (bflags & BLIST_FORCELUN) | |
1202 | max_dev_lun = shost->max_lun; | |
1203 | /* | |
1204 | * REGAL CDC-4X: avoid hang after LUN 4 | |
1205 | */ | |
1206 | if (bflags & BLIST_MAX5LUN) | |
1207 | max_dev_lun = min(5U, max_dev_lun); | |
1208 | /* | |
1209 | * Do not scan SCSI-2 or lower device past LUN 7, unless | |
1210 | * BLIST_LARGELUN. | |
1211 | */ | |
1212 | if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN)) | |
1213 | max_dev_lun = min(8U, max_dev_lun); | |
1214 | ||
1215 | /* | |
1216 | * We have already scanned LUN 0, so start at LUN 1. Keep scanning | |
1217 | * until we reach the max, or no LUN is found and we are not | |
1218 | * sparse_lun. | |
1219 | */ | |
1220 | for (lun = 1; lun < max_dev_lun; ++lun) | |
1221 | if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, | |
1222 | NULL) != SCSI_SCAN_LUN_PRESENT) && | |
1223 | !sparse_lun) | |
1224 | return; | |
1225 | } | |
1226 | ||
1227 | /** | |
1228 | * scsilun_to_int: convert a scsi_lun to an int | |
1229 | * @scsilun: struct scsi_lun to be converted. | |
1230 | * | |
1231 | * Description: | |
1232 | * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered | |
1233 | * integer, and return the result. The caller must check for | |
1234 | * truncation before using this function. | |
1235 | * | |
1236 | * Notes: | |
1237 | * The struct scsi_lun is assumed to be four levels, with each level | |
1238 | * effectively containing a SCSI byte-ordered (big endian) short; the | |
1239 | * addressing bits of each level are ignored (the highest two bits). | |
1240 | * For a description of the LUN format, post SCSI-3 see the SCSI | |
1241 | * Architecture Model, for SCSI-3 see the SCSI Controller Commands. | |
1242 | * | |
1243 | * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns | |
1244 | * the integer: 0x0b030a04 | |
1245 | **/ | |
462b7859 | 1246 | int scsilun_to_int(struct scsi_lun *scsilun) |
1da177e4 LT |
1247 | { |
1248 | int i; | |
1249 | unsigned int lun; | |
1250 | ||
1251 | lun = 0; | |
1252 | for (i = 0; i < sizeof(lun); i += 2) | |
1253 | lun = lun | (((scsilun->scsi_lun[i] << 8) | | |
1254 | scsilun->scsi_lun[i + 1]) << (i * 8)); | |
1255 | return lun; | |
1256 | } | |
462b7859 | 1257 | EXPORT_SYMBOL(scsilun_to_int); |
1da177e4 | 1258 | |
2f4701d8 JSEC |
1259 | /** |
1260 | * int_to_scsilun: reverts an int into a scsi_lun | |
eb44820c | 1261 | * @lun: integer to be reverted |
2f4701d8 JSEC |
1262 | * @scsilun: struct scsi_lun to be set. |
1263 | * | |
1264 | * Description: | |
1265 | * Reverts the functionality of the scsilun_to_int, which packed | |
1266 | * an 8-byte lun value into an int. This routine unpacks the int | |
1267 | * back into the lun value. | |
1268 | * Note: the scsilun_to_int() routine does not truly handle all | |
1269 | * 8bytes of the lun value. This functions restores only as much | |
1270 | * as was set by the routine. | |
1271 | * | |
1272 | * Notes: | |
1273 | * Given an integer : 0x0b030a04, this function returns a | |
1274 | * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00 | |
1275 | * | |
1276 | **/ | |
1277 | void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun) | |
1278 | { | |
1279 | int i; | |
1280 | ||
1281 | memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun)); | |
1282 | ||
1283 | for (i = 0; i < sizeof(lun); i += 2) { | |
1284 | scsilun->scsi_lun[i] = (lun >> 8) & 0xFF; | |
1285 | scsilun->scsi_lun[i+1] = lun & 0xFF; | |
1286 | lun = lun >> 16; | |
1287 | } | |
1288 | } | |
1289 | EXPORT_SYMBOL(int_to_scsilun); | |
1290 | ||
1da177e4 LT |
1291 | /** |
1292 | * scsi_report_lun_scan - Scan using SCSI REPORT LUN results | |
eb44820c RL |
1293 | * @starget: which target |
1294 | * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN | |
1295 | * @rescan: nonzero if we can skip code only needed on first scan | |
1da177e4 LT |
1296 | * |
1297 | * Description: | |
eb44820c RL |
1298 | * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command. |
1299 | * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun. | |
1da177e4 | 1300 | * |
eb44820c RL |
1301 | * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8 |
1302 | * LUNs even if it's older than SCSI-3. | |
1303 | * If BLIST_NOREPORTLUN is set, return 1 always. | |
1304 | * If BLIST_NOLUN is set, return 0 always. | |
1da177e4 LT |
1305 | * |
1306 | * Return: | |
1307 | * 0: scan completed (or no memory, so further scanning is futile) | |
eb44820c | 1308 | * 1: could not scan with REPORT LUN |
1da177e4 | 1309 | **/ |
6f3a2024 | 1310 | static int scsi_report_lun_scan(struct scsi_target *starget, int bflags, |
1da177e4 LT |
1311 | int rescan) |
1312 | { | |
1313 | char devname[64]; | |
1314 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
1315 | unsigned int length; | |
1316 | unsigned int lun; | |
1317 | unsigned int num_luns; | |
1318 | unsigned int retries; | |
39216033 | 1319 | int result; |
1da177e4 | 1320 | struct scsi_lun *lunp, *lun_data; |
1da177e4 LT |
1321 | u8 *data; |
1322 | struct scsi_sense_hdr sshdr; | |
6f3a2024 JB |
1323 | struct scsi_device *sdev; |
1324 | struct Scsi_Host *shost = dev_to_shost(&starget->dev); | |
2ef89198 | 1325 | int ret = 0; |
1da177e4 LT |
1326 | |
1327 | /* | |
1328 | * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set. | |
1329 | * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does | |
1330 | * support more than 8 LUNs. | |
1331 | */ | |
4d7db04a JB |
1332 | if (bflags & BLIST_NOREPORTLUN) |
1333 | return 1; | |
1334 | if (starget->scsi_level < SCSI_2 && | |
1335 | starget->scsi_level != SCSI_UNKNOWN) | |
1336 | return 1; | |
1337 | if (starget->scsi_level < SCSI_3 && | |
1338 | (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) | |
1da177e4 LT |
1339 | return 1; |
1340 | if (bflags & BLIST_NOLUN) | |
1341 | return 0; | |
1342 | ||
6f3a2024 JB |
1343 | if (!(sdev = scsi_device_lookup_by_target(starget, 0))) { |
1344 | sdev = scsi_alloc_sdev(starget, 0, NULL); | |
1345 | if (!sdev) | |
1346 | return 0; | |
1347 | if (scsi_device_get(sdev)) | |
1348 | return 0; | |
1349 | } | |
1350 | ||
1da177e4 | 1351 | sprintf(devname, "host %d channel %d id %d", |
6f3a2024 | 1352 | shost->host_no, sdev->channel, sdev->id); |
1da177e4 LT |
1353 | |
1354 | /* | |
1355 | * Allocate enough to hold the header (the same size as one scsi_lun) | |
1356 | * plus the max number of luns we are requesting. | |
1357 | * | |
1358 | * Reallocating and trying again (with the exact amount we need) | |
1359 | * would be nice, but then we need to somehow limit the size | |
1360 | * allocated based on the available memory and the limits of | |
1361 | * kmalloc - we don't want a kmalloc() failure of a huge value to | |
1362 | * prevent us from finding any LUNs on this target. | |
1363 | */ | |
1364 | length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun); | |
1365 | lun_data = kmalloc(length, GFP_ATOMIC | | |
1366 | (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0)); | |
6f3a2024 | 1367 | if (!lun_data) { |
cadbd4a5 | 1368 | printk(ALLOC_FAILURE_MSG, __func__); |
39216033 | 1369 | goto out; |
6f3a2024 | 1370 | } |
1da177e4 LT |
1371 | |
1372 | scsi_cmd[0] = REPORT_LUNS; | |
1373 | ||
1374 | /* | |
1375 | * bytes 1 - 5: reserved, set to zero. | |
1376 | */ | |
1377 | memset(&scsi_cmd[1], 0, 5); | |
1378 | ||
1379 | /* | |
1380 | * bytes 6 - 9: length of the command. | |
1381 | */ | |
1382 | scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff; | |
1383 | scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff; | |
1384 | scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff; | |
1385 | scsi_cmd[9] = (unsigned char) length & 0xff; | |
1386 | ||
1387 | scsi_cmd[10] = 0; /* reserved */ | |
1388 | scsi_cmd[11] = 0; /* control */ | |
1da177e4 LT |
1389 | |
1390 | /* | |
1391 | * We can get a UNIT ATTENTION, for example a power on/reset, so | |
1392 | * retry a few times (like sd.c does for TEST UNIT READY). | |
1393 | * Experience shows some combinations of adapter/devices get at | |
1394 | * least two power on/resets. | |
1395 | * | |
1396 | * Illegal requests (for devices that do not support REPORT LUNS) | |
1397 | * should come through as a check condition, and will not generate | |
1398 | * a retry. | |
1399 | */ | |
1400 | for (retries = 0; retries < 3; retries++) { | |
1401 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending" | |
1402 | " REPORT LUNS to %s (try %d)\n", devname, | |
1403 | retries)); | |
39216033 | 1404 | |
39216033 | 1405 | result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, |
ea73a9f2 | 1406 | lun_data, length, &sshdr, |
f4f4e47e | 1407 | SCSI_TIMEOUT + 4 * HZ, 3, NULL); |
39216033 | 1408 | |
1da177e4 | 1409 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS" |
39216033 JB |
1410 | " %s (try %d) result 0x%x\n", result |
1411 | ? "failed" : "successful", retries, result)); | |
1412 | if (result == 0) | |
1da177e4 | 1413 | break; |
ea73a9f2 | 1414 | else if (scsi_sense_valid(&sshdr)) { |
1da177e4 LT |
1415 | if (sshdr.sense_key != UNIT_ATTENTION) |
1416 | break; | |
1417 | } | |
1418 | } | |
1419 | ||
39216033 | 1420 | if (result) { |
1da177e4 LT |
1421 | /* |
1422 | * The device probably does not support a REPORT LUN command | |
1423 | */ | |
2ef89198 AS |
1424 | ret = 1; |
1425 | goto out_err; | |
1da177e4 | 1426 | } |
1da177e4 LT |
1427 | |
1428 | /* | |
1429 | * Get the length from the first four bytes of lun_data. | |
1430 | */ | |
1431 | data = (u8 *) lun_data->scsi_lun; | |
1432 | length = ((data[0] << 24) | (data[1] << 16) | | |
1433 | (data[2] << 8) | (data[3] << 0)); | |
1434 | ||
1435 | num_luns = (length / sizeof(struct scsi_lun)); | |
1436 | if (num_luns > max_scsi_report_luns) { | |
1437 | printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)" | |
1438 | " of %d luns reported, try increasing" | |
1439 | " max_scsi_report_luns.\n", devname, | |
1440 | max_scsi_report_luns, num_luns); | |
1441 | num_luns = max_scsi_report_luns; | |
1442 | } | |
1443 | ||
3bf743e7 JG |
1444 | SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, |
1445 | "scsi scan: REPORT LUN scan\n")); | |
1da177e4 LT |
1446 | |
1447 | /* | |
1448 | * Scan the luns in lun_data. The entry at offset 0 is really | |
1449 | * the header, so start at 1 and go up to and including num_luns. | |
1450 | */ | |
1451 | for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) { | |
1452 | lun = scsilun_to_int(lunp); | |
1453 | ||
1454 | /* | |
1455 | * Check if the unused part of lunp is non-zero, and so | |
1456 | * does not fit in lun. | |
1457 | */ | |
1458 | if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) { | |
1459 | int i; | |
1460 | ||
1461 | /* | |
1462 | * Output an error displaying the LUN in byte order, | |
1463 | * this differs from what linux would print for the | |
1464 | * integer LUN value. | |
1465 | */ | |
1466 | printk(KERN_WARNING "scsi: %s lun 0x", devname); | |
1467 | data = (char *)lunp->scsi_lun; | |
1468 | for (i = 0; i < sizeof(struct scsi_lun); i++) | |
1469 | printk("%02x", data[i]); | |
1470 | printk(" has a LUN larger than currently supported.\n"); | |
1da177e4 LT |
1471 | } else if (lun > sdev->host->max_lun) { |
1472 | printk(KERN_WARNING "scsi: %s lun%d has a LUN larger" | |
1473 | " than allowed by the host adapter\n", | |
1474 | devname, lun); | |
1475 | } else { | |
1476 | int res; | |
1477 | ||
1478 | res = scsi_probe_and_add_lun(starget, | |
1479 | lun, NULL, NULL, rescan, NULL); | |
1480 | if (res == SCSI_SCAN_NO_RESPONSE) { | |
1481 | /* | |
1482 | * Got some results, but now none, abort. | |
1483 | */ | |
3bf743e7 JG |
1484 | sdev_printk(KERN_ERR, sdev, |
1485 | "Unexpected response" | |
1486 | " from lun %d while scanning, scan" | |
1487 | " aborted\n", lun); | |
1da177e4 LT |
1488 | break; |
1489 | } | |
1490 | } | |
1491 | } | |
1492 | ||
2ef89198 | 1493 | out_err: |
1da177e4 | 1494 | kfree(lun_data); |
1da177e4 | 1495 | out: |
6f3a2024 | 1496 | scsi_device_put(sdev); |
0f1d87a2 | 1497 | if (scsi_device_created(sdev)) |
6f3a2024 JB |
1498 | /* |
1499 | * the sdev we used didn't appear in the report luns scan | |
1500 | */ | |
1501 | scsi_destroy_sdev(sdev); | |
2ef89198 | 1502 | return ret; |
1da177e4 LT |
1503 | } |
1504 | ||
1505 | struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel, | |
1506 | uint id, uint lun, void *hostdata) | |
1507 | { | |
a97a83a0 | 1508 | struct scsi_device *sdev = ERR_PTR(-ENODEV); |
1da177e4 | 1509 | struct device *parent = &shost->shost_gendev; |
e02f3f59 | 1510 | struct scsi_target *starget; |
1da177e4 | 1511 | |
938e2ac0 MW |
1512 | if (strncmp(scsi_scan_type, "none", 4) == 0) |
1513 | return ERR_PTR(-ENODEV); | |
1514 | ||
e02f3f59 | 1515 | starget = scsi_alloc_target(parent, channel, id); |
1da177e4 LT |
1516 | if (!starget) |
1517 | return ERR_PTR(-ENOMEM); | |
1518 | ||
0b950672 | 1519 | mutex_lock(&shost->scan_mutex); |
6b7f123f MW |
1520 | if (!shost->async_scan) |
1521 | scsi_complete_async_scans(); | |
1522 | ||
a97a83a0 MW |
1523 | if (scsi_host_scan_allowed(shost)) |
1524 | scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata); | |
0b950672 | 1525 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
1526 | scsi_target_reap(starget); |
1527 | put_device(&starget->dev); | |
1528 | ||
1529 | return sdev; | |
1530 | } | |
1531 | EXPORT_SYMBOL(__scsi_add_device); | |
1532 | ||
146f7262 JB |
1533 | int scsi_add_device(struct Scsi_Host *host, uint channel, |
1534 | uint target, uint lun) | |
1535 | { | |
1536 | struct scsi_device *sdev = | |
1537 | __scsi_add_device(host, channel, target, lun, NULL); | |
1538 | if (IS_ERR(sdev)) | |
1539 | return PTR_ERR(sdev); | |
1540 | ||
1541 | scsi_device_put(sdev); | |
1542 | return 0; | |
1543 | } | |
1544 | EXPORT_SYMBOL(scsi_add_device); | |
1545 | ||
1da177e4 LT |
1546 | void scsi_rescan_device(struct device *dev) |
1547 | { | |
1548 | struct scsi_driver *drv; | |
1549 | ||
1550 | if (!dev->driver) | |
1551 | return; | |
1552 | ||
1553 | drv = to_scsi_driver(dev->driver); | |
1554 | if (try_module_get(drv->owner)) { | |
1555 | if (drv->rescan) | |
1556 | drv->rescan(dev); | |
1557 | module_put(drv->owner); | |
1558 | } | |
1559 | } | |
1560 | EXPORT_SYMBOL(scsi_rescan_device); | |
1561 | ||
e517d313 AS |
1562 | static void __scsi_scan_target(struct device *parent, unsigned int channel, |
1563 | unsigned int id, unsigned int lun, int rescan) | |
1da177e4 LT |
1564 | { |
1565 | struct Scsi_Host *shost = dev_to_shost(parent); | |
1566 | int bflags = 0; | |
1567 | int res; | |
1da177e4 LT |
1568 | struct scsi_target *starget; |
1569 | ||
1570 | if (shost->this_id == id) | |
1571 | /* | |
1572 | * Don't scan the host adapter | |
1573 | */ | |
1574 | return; | |
1575 | ||
1da177e4 | 1576 | starget = scsi_alloc_target(parent, channel, id); |
1da177e4 LT |
1577 | if (!starget) |
1578 | return; | |
1579 | ||
1da177e4 LT |
1580 | if (lun != SCAN_WILD_CARD) { |
1581 | /* | |
1582 | * Scan for a specific host/chan/id/lun. | |
1583 | */ | |
1584 | scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL); | |
1585 | goto out_reap; | |
1586 | } | |
1587 | ||
1588 | /* | |
1589 | * Scan LUN 0, if there is some response, scan further. Ideally, we | |
1590 | * would not configure LUN 0 until all LUNs are scanned. | |
1591 | */ | |
6f3a2024 JB |
1592 | res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL); |
1593 | if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) { | |
1594 | if (scsi_report_lun_scan(starget, bflags, rescan) != 0) | |
1da177e4 LT |
1595 | /* |
1596 | * The REPORT LUN did not scan the target, | |
1597 | * do a sequential scan. | |
1598 | */ | |
1599 | scsi_sequential_lun_scan(starget, bflags, | |
4186ab19 | 1600 | starget->scsi_level, rescan); |
1da177e4 | 1601 | } |
1da177e4 LT |
1602 | |
1603 | out_reap: | |
1604 | /* now determine if the target has any children at all | |
1605 | * and if not, nuke it */ | |
1606 | scsi_target_reap(starget); | |
1607 | ||
1608 | put_device(&starget->dev); | |
1609 | } | |
e517d313 AS |
1610 | |
1611 | /** | |
e59e4a09 | 1612 | * scsi_scan_target - scan a target id, possibly including all LUNs on the target. |
e517d313 AS |
1613 | * @parent: host to scan |
1614 | * @channel: channel to scan | |
1615 | * @id: target id to scan | |
1616 | * @lun: Specific LUN to scan or SCAN_WILD_CARD | |
1617 | * @rescan: passed to LUN scanning routines | |
1618 | * | |
1619 | * Description: | |
1620 | * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0, | |
1621 | * and possibly all LUNs on the target id. | |
1622 | * | |
1623 | * First try a REPORT LUN scan, if that does not scan the target, do a | |
1624 | * sequential scan of LUNs on the target id. | |
1625 | **/ | |
1626 | void scsi_scan_target(struct device *parent, unsigned int channel, | |
1627 | unsigned int id, unsigned int lun, int rescan) | |
1628 | { | |
1629 | struct Scsi_Host *shost = dev_to_shost(parent); | |
1630 | ||
93b45af5 MW |
1631 | if (strncmp(scsi_scan_type, "none", 4) == 0) |
1632 | return; | |
1633 | ||
6b7f123f | 1634 | mutex_lock(&shost->scan_mutex); |
3e082a91 MW |
1635 | if (!shost->async_scan) |
1636 | scsi_complete_async_scans(); | |
1637 | ||
e517d313 AS |
1638 | if (scsi_host_scan_allowed(shost)) |
1639 | __scsi_scan_target(parent, channel, id, lun, rescan); | |
0b950672 | 1640 | mutex_unlock(&shost->scan_mutex); |
e517d313 | 1641 | } |
1da177e4 LT |
1642 | EXPORT_SYMBOL(scsi_scan_target); |
1643 | ||
1644 | static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel, | |
1645 | unsigned int id, unsigned int lun, int rescan) | |
1646 | { | |
1647 | uint order_id; | |
1648 | ||
1649 | if (id == SCAN_WILD_CARD) | |
1650 | for (id = 0; id < shost->max_id; ++id) { | |
1651 | /* | |
1652 | * XXX adapter drivers when possible (FCP, iSCSI) | |
1653 | * could modify max_id to match the current max, | |
1654 | * not the absolute max. | |
1655 | * | |
1656 | * XXX add a shost id iterator, so for example, | |
1657 | * the FC ID can be the same as a target id | |
1658 | * without a huge overhead of sparse id's. | |
1659 | */ | |
1660 | if (shost->reverse_ordering) | |
1661 | /* | |
1662 | * Scan from high to low id. | |
1663 | */ | |
1664 | order_id = shost->max_id - id - 1; | |
1665 | else | |
1666 | order_id = id; | |
e517d313 AS |
1667 | __scsi_scan_target(&shost->shost_gendev, channel, |
1668 | order_id, lun, rescan); | |
1da177e4 LT |
1669 | } |
1670 | else | |
e517d313 AS |
1671 | __scsi_scan_target(&shost->shost_gendev, channel, |
1672 | id, lun, rescan); | |
1da177e4 LT |
1673 | } |
1674 | ||
1675 | int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel, | |
1676 | unsigned int id, unsigned int lun, int rescan) | |
1677 | { | |
3bf743e7 JG |
1678 | SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost, |
1679 | "%s: <%u:%u:%u>\n", | |
cadbd4a5 | 1680 | __func__, channel, id, lun)); |
1da177e4 LT |
1681 | |
1682 | if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) || | |
091686d3 | 1683 | ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) || |
1da177e4 LT |
1684 | ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun))) |
1685 | return -EINVAL; | |
1686 | ||
0b950672 | 1687 | mutex_lock(&shost->scan_mutex); |
6b7f123f MW |
1688 | if (!shost->async_scan) |
1689 | scsi_complete_async_scans(); | |
1690 | ||
82f29467 MA |
1691 | if (scsi_host_scan_allowed(shost)) { |
1692 | if (channel == SCAN_WILD_CARD) | |
1693 | for (channel = 0; channel <= shost->max_channel; | |
1694 | channel++) | |
1695 | scsi_scan_channel(shost, channel, id, lun, | |
1696 | rescan); | |
1697 | else | |
1da177e4 | 1698 | scsi_scan_channel(shost, channel, id, lun, rescan); |
82f29467 | 1699 | } |
0b950672 | 1700 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
1701 | |
1702 | return 0; | |
1703 | } | |
1704 | ||
3e082a91 MW |
1705 | static void scsi_sysfs_add_devices(struct Scsi_Host *shost) |
1706 | { | |
1707 | struct scsi_device *sdev; | |
1708 | shost_for_each_device(sdev, shost) { | |
6b7f123f MW |
1709 | if (!scsi_host_scan_allowed(shost) || |
1710 | scsi_sysfs_add_sdev(sdev) != 0) | |
3e082a91 MW |
1711 | scsi_destroy_sdev(sdev); |
1712 | } | |
1713 | } | |
1714 | ||
1715 | /** | |
1716 | * scsi_prep_async_scan - prepare for an async scan | |
1717 | * @shost: the host which will be scanned | |
1718 | * Returns: a cookie to be passed to scsi_finish_async_scan() | |
1719 | * | |
1720 | * Tells the midlayer this host is going to do an asynchronous scan. | |
1721 | * It reserves the host's position in the scanning list and ensures | |
1722 | * that other asynchronous scans started after this one won't affect the | |
1723 | * ordering of the discovered devices. | |
1724 | */ | |
1aa8fab2 | 1725 | static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost) |
3e082a91 MW |
1726 | { |
1727 | struct async_scan_data *data; | |
6b7f123f | 1728 | unsigned long flags; |
3e082a91 MW |
1729 | |
1730 | if (strncmp(scsi_scan_type, "sync", 4) == 0) | |
1731 | return NULL; | |
1732 | ||
1733 | if (shost->async_scan) { | |
cadbd4a5 | 1734 | printk("%s called twice for host %d", __func__, |
3e082a91 MW |
1735 | shost->host_no); |
1736 | dump_stack(); | |
1737 | return NULL; | |
1738 | } | |
1739 | ||
1740 | data = kmalloc(sizeof(*data), GFP_KERNEL); | |
1741 | if (!data) | |
1742 | goto err; | |
1743 | data->shost = scsi_host_get(shost); | |
1744 | if (!data->shost) | |
1745 | goto err; | |
1746 | init_completion(&data->prev_finished); | |
1747 | ||
6b7f123f MW |
1748 | mutex_lock(&shost->scan_mutex); |
1749 | spin_lock_irqsave(shost->host_lock, flags); | |
3e082a91 | 1750 | shost->async_scan = 1; |
6b7f123f MW |
1751 | spin_unlock_irqrestore(shost->host_lock, flags); |
1752 | mutex_unlock(&shost->scan_mutex); | |
1753 | ||
1754 | spin_lock(&async_scan_lock); | |
3e082a91 MW |
1755 | if (list_empty(&scanning_hosts)) |
1756 | complete(&data->prev_finished); | |
1757 | list_add_tail(&data->list, &scanning_hosts); | |
1758 | spin_unlock(&async_scan_lock); | |
1759 | ||
1760 | return data; | |
1761 | ||
1762 | err: | |
1763 | kfree(data); | |
1764 | return NULL; | |
1765 | } | |
1766 | ||
1767 | /** | |
1768 | * scsi_finish_async_scan - asynchronous scan has finished | |
1769 | * @data: cookie returned from earlier call to scsi_prep_async_scan() | |
1770 | * | |
1771 | * All the devices currently attached to this host have been found. | |
1772 | * This function announces all the devices it has found to the rest | |
1773 | * of the system. | |
1774 | */ | |
1aa8fab2 | 1775 | static void scsi_finish_async_scan(struct async_scan_data *data) |
3e082a91 MW |
1776 | { |
1777 | struct Scsi_Host *shost; | |
6b7f123f | 1778 | unsigned long flags; |
3e082a91 MW |
1779 | |
1780 | if (!data) | |
1781 | return; | |
1782 | ||
1783 | shost = data->shost; | |
6b7f123f MW |
1784 | |
1785 | mutex_lock(&shost->scan_mutex); | |
1786 | ||
3e082a91 | 1787 | if (!shost->async_scan) { |
cadbd4a5 | 1788 | printk("%s called twice for host %d", __func__, |
3e082a91 MW |
1789 | shost->host_no); |
1790 | dump_stack(); | |
773e82f6 | 1791 | mutex_unlock(&shost->scan_mutex); |
3e082a91 MW |
1792 | return; |
1793 | } | |
1794 | ||
1795 | wait_for_completion(&data->prev_finished); | |
1796 | ||
1797 | scsi_sysfs_add_devices(shost); | |
1798 | ||
6b7f123f | 1799 | spin_lock_irqsave(shost->host_lock, flags); |
3e082a91 | 1800 | shost->async_scan = 0; |
6b7f123f MW |
1801 | spin_unlock_irqrestore(shost->host_lock, flags); |
1802 | ||
1803 | mutex_unlock(&shost->scan_mutex); | |
1804 | ||
1805 | spin_lock(&async_scan_lock); | |
3e082a91 MW |
1806 | list_del(&data->list); |
1807 | if (!list_empty(&scanning_hosts)) { | |
1808 | struct async_scan_data *next = list_entry(scanning_hosts.next, | |
1809 | struct async_scan_data, list); | |
1810 | complete(&next->prev_finished); | |
1811 | } | |
1812 | spin_unlock(&async_scan_lock); | |
1813 | ||
1814 | scsi_host_put(shost); | |
1815 | kfree(data); | |
1816 | } | |
1817 | ||
1aa8fab2 | 1818 | static void do_scsi_scan_host(struct Scsi_Host *shost) |
3e082a91 | 1819 | { |
1aa8fab2 MW |
1820 | if (shost->hostt->scan_finished) { |
1821 | unsigned long start = jiffies; | |
1822 | if (shost->hostt->scan_start) | |
1823 | shost->hostt->scan_start(shost); | |
1824 | ||
1825 | while (!shost->hostt->scan_finished(shost, jiffies - start)) | |
1826 | msleep(10); | |
1827 | } else { | |
1828 | scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD, | |
3e082a91 | 1829 | SCAN_WILD_CARD, 0); |
1aa8fab2 MW |
1830 | } |
1831 | } | |
3e082a91 | 1832 | |
1aa8fab2 MW |
1833 | static int do_scan_async(void *_data) |
1834 | { | |
1835 | struct async_scan_data *data = _data; | |
1836 | do_scsi_scan_host(data->shost); | |
3e082a91 MW |
1837 | scsi_finish_async_scan(data); |
1838 | return 0; | |
1839 | } | |
1840 | ||
1da177e4 LT |
1841 | /** |
1842 | * scsi_scan_host - scan the given adapter | |
1843 | * @shost: adapter to scan | |
1844 | **/ | |
1845 | void scsi_scan_host(struct Scsi_Host *shost) | |
1846 | { | |
a57b1fcc | 1847 | struct task_struct *p; |
3e082a91 MW |
1848 | struct async_scan_data *data; |
1849 | ||
1850 | if (strncmp(scsi_scan_type, "none", 4) == 0) | |
1851 | return; | |
1852 | ||
1853 | data = scsi_prep_async_scan(shost); | |
1854 | if (!data) { | |
1aa8fab2 | 1855 | do_scsi_scan_host(shost); |
3e082a91 MW |
1856 | return; |
1857 | } | |
1aa8fab2 | 1858 | |
a57b1fcc | 1859 | p = kthread_run(do_scan_async, data, "scsi_scan_%d", shost->host_no); |
801678c5 | 1860 | if (IS_ERR(p)) |
a57b1fcc | 1861 | do_scan_async(data); |
1da177e4 LT |
1862 | } |
1863 | EXPORT_SYMBOL(scsi_scan_host); | |
1864 | ||
1da177e4 LT |
1865 | void scsi_forget_host(struct Scsi_Host *shost) |
1866 | { | |
a64358db | 1867 | struct scsi_device *sdev; |
1da177e4 LT |
1868 | unsigned long flags; |
1869 | ||
a64358db | 1870 | restart: |
1da177e4 | 1871 | spin_lock_irqsave(shost->host_lock, flags); |
a64358db AS |
1872 | list_for_each_entry(sdev, &shost->__devices, siblings) { |
1873 | if (sdev->sdev_state == SDEV_DEL) | |
1874 | continue; | |
1da177e4 | 1875 | spin_unlock_irqrestore(shost->host_lock, flags); |
a64358db AS |
1876 | __scsi_remove_device(sdev); |
1877 | goto restart; | |
1da177e4 LT |
1878 | } |
1879 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1880 | } | |
1881 | ||
1882 | /* | |
1883 | * Function: scsi_get_host_dev() | |
1884 | * | |
f64a181d | 1885 | * Purpose: Create a scsi_device that points to the host adapter itself. |
1da177e4 | 1886 | * |
f64a181d | 1887 | * Arguments: SHpnt - Host that needs a scsi_device |
1da177e4 LT |
1888 | * |
1889 | * Lock status: None assumed. | |
1890 | * | |
f64a181d | 1891 | * Returns: The scsi_device or NULL |
1da177e4 LT |
1892 | * |
1893 | * Notes: | |
f64a181d | 1894 | * Attach a single scsi_device to the Scsi_Host - this should |
1da177e4 LT |
1895 | * be made to look like a "pseudo-device" that points to the |
1896 | * HA itself. | |
1897 | * | |
1898 | * Note - this device is not accessible from any high-level | |
1899 | * drivers (including generics), which is probably not | |
1900 | * optimal. We can add hooks later to attach | |
1901 | */ | |
1902 | struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost) | |
1903 | { | |
e517d313 | 1904 | struct scsi_device *sdev = NULL; |
1da177e4 LT |
1905 | struct scsi_target *starget; |
1906 | ||
0b950672 | 1907 | mutex_lock(&shost->scan_mutex); |
e517d313 AS |
1908 | if (!scsi_host_scan_allowed(shost)) |
1909 | goto out; | |
1da177e4 LT |
1910 | starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id); |
1911 | if (!starget) | |
e517d313 | 1912 | goto out; |
1da177e4 LT |
1913 | |
1914 | sdev = scsi_alloc_sdev(starget, 0, NULL); | |
1915 | if (sdev) { | |
1916 | sdev->sdev_gendev.parent = get_device(&starget->dev); | |
1917 | sdev->borken = 0; | |
884d25cc JB |
1918 | } else |
1919 | scsi_target_reap(starget); | |
1da177e4 | 1920 | put_device(&starget->dev); |
e517d313 | 1921 | out: |
0b950672 | 1922 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
1923 | return sdev; |
1924 | } | |
1925 | EXPORT_SYMBOL(scsi_get_host_dev); | |
1926 | ||
1927 | /* | |
1928 | * Function: scsi_free_host_dev() | |
1929 | * | |
1930 | * Purpose: Free a scsi_device that points to the host adapter itself. | |
1931 | * | |
f64a181d | 1932 | * Arguments: SHpnt - Host that needs a scsi_device |
1da177e4 LT |
1933 | * |
1934 | * Lock status: None assumed. | |
1935 | * | |
1936 | * Returns: Nothing | |
1937 | * | |
1938 | * Notes: | |
1939 | */ | |
1940 | void scsi_free_host_dev(struct scsi_device *sdev) | |
1941 | { | |
1942 | BUG_ON(sdev->id != sdev->host->this_id); | |
1943 | ||
6f3a2024 | 1944 | scsi_destroy_sdev(sdev); |
1da177e4 LT |
1945 | } |
1946 | EXPORT_SYMBOL(scsi_free_host_dev); | |
1947 |