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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> | |
1da177e4 LT |
35 | |
36 | #include <scsi/scsi.h> | |
beb40487 | 37 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
38 | #include <scsi/scsi_device.h> |
39 | #include <scsi/scsi_driver.h> | |
40 | #include <scsi/scsi_devinfo.h> | |
41 | #include <scsi/scsi_host.h> | |
1da177e4 LT |
42 | #include <scsi/scsi_transport.h> |
43 | #include <scsi/scsi_eh.h> | |
44 | ||
45 | #include "scsi_priv.h" | |
46 | #include "scsi_logging.h" | |
47 | ||
48 | #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \ | |
49 | " SCSI scanning, some SCSI devices might not be configured\n" | |
50 | ||
51 | /* | |
52 | * Default timeout | |
53 | */ | |
54 | #define SCSI_TIMEOUT (2*HZ) | |
55 | ||
56 | /* | |
57 | * Prefix values for the SCSI id's (stored in driverfs name field) | |
58 | */ | |
59 | #define SCSI_UID_SER_NUM 'S' | |
60 | #define SCSI_UID_UNKNOWN 'Z' | |
61 | ||
62 | /* | |
63 | * Return values of some of the scanning functions. | |
64 | * | |
65 | * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this | |
66 | * includes allocation or general failures preventing IO from being sent. | |
67 | * | |
68 | * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available | |
69 | * on the given LUN. | |
70 | * | |
71 | * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a | |
72 | * given LUN. | |
73 | */ | |
74 | #define SCSI_SCAN_NO_RESPONSE 0 | |
75 | #define SCSI_SCAN_TARGET_PRESENT 1 | |
76 | #define SCSI_SCAN_LUN_PRESENT 2 | |
77 | ||
0ad78200 | 78 | static const char *scsi_null_device_strs = "nullnullnullnull"; |
1da177e4 LT |
79 | |
80 | #define MAX_SCSI_LUNS 512 | |
81 | ||
82 | #ifdef CONFIG_SCSI_MULTI_LUN | |
83 | static unsigned int max_scsi_luns = MAX_SCSI_LUNS; | |
84 | #else | |
85 | static unsigned int max_scsi_luns = 1; | |
86 | #endif | |
87 | ||
88 | module_param_named(max_luns, max_scsi_luns, int, S_IRUGO|S_IWUSR); | |
89 | MODULE_PARM_DESC(max_luns, | |
90 | "last scsi LUN (should be between 1 and 2^32-1)"); | |
91 | ||
21db1882 MW |
92 | #ifdef CONFIG_SCSI_SCAN_ASYNC |
93 | #define SCSI_SCAN_TYPE_DEFAULT "async" | |
94 | #else | |
95 | #define SCSI_SCAN_TYPE_DEFAULT "sync" | |
96 | #endif | |
97 | ||
98 | static char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT; | |
3e082a91 MW |
99 | |
100 | module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO); | |
101 | MODULE_PARM_DESC(scan, "sync, async or none"); | |
102 | ||
1da177e4 LT |
103 | /* |
104 | * max_scsi_report_luns: the maximum number of LUNS that will be | |
105 | * returned from the REPORT LUNS command. 8 times this value must | |
106 | * be allocated. In theory this could be up to an 8 byte value, but | |
107 | * in practice, the maximum number of LUNs suppored by any device | |
108 | * is about 16k. | |
109 | */ | |
110 | static unsigned int max_scsi_report_luns = 511; | |
111 | ||
112 | module_param_named(max_report_luns, max_scsi_report_luns, int, S_IRUGO|S_IWUSR); | |
113 | MODULE_PARM_DESC(max_report_luns, | |
114 | "REPORT LUNS maximum number of LUNS received (should be" | |
115 | " between 1 and 16384)"); | |
116 | ||
117 | static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+3; | |
118 | ||
119 | module_param_named(inq_timeout, scsi_inq_timeout, int, S_IRUGO|S_IWUSR); | |
120 | MODULE_PARM_DESC(inq_timeout, | |
121 | "Timeout (in seconds) waiting for devices to answer INQUIRY." | |
122 | " Default is 5. Some non-compliant devices need more."); | |
123 | ||
3e082a91 MW |
124 | static DEFINE_SPINLOCK(async_scan_lock); |
125 | static LIST_HEAD(scanning_hosts); | |
126 | ||
127 | struct async_scan_data { | |
128 | struct list_head list; | |
129 | struct Scsi_Host *shost; | |
130 | struct completion prev_finished; | |
131 | }; | |
132 | ||
133 | /** | |
134 | * scsi_complete_async_scans - Wait for asynchronous scans to complete | |
135 | * | |
8bcc2412 MW |
136 | * When this function returns, any host which started scanning before |
137 | * this function was called will have finished its scan. Hosts which | |
138 | * started scanning after this function was called may or may not have | |
139 | * finished. | |
3e082a91 MW |
140 | */ |
141 | int scsi_complete_async_scans(void) | |
142 | { | |
143 | struct async_scan_data *data; | |
144 | ||
145 | do { | |
146 | if (list_empty(&scanning_hosts)) | |
147 | return 0; | |
148 | /* If we can't get memory immediately, that's OK. Just | |
149 | * sleep a little. Even if we never get memory, the async | |
150 | * scans will finish eventually. | |
151 | */ | |
152 | data = kmalloc(sizeof(*data), GFP_KERNEL); | |
153 | if (!data) | |
154 | msleep(1); | |
155 | } while (!data); | |
156 | ||
157 | data->shost = NULL; | |
158 | init_completion(&data->prev_finished); | |
159 | ||
160 | spin_lock(&async_scan_lock); | |
161 | /* Check that there's still somebody else on the list */ | |
162 | if (list_empty(&scanning_hosts)) | |
163 | goto done; | |
164 | list_add_tail(&data->list, &scanning_hosts); | |
165 | spin_unlock(&async_scan_lock); | |
166 | ||
167 | printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n"); | |
168 | wait_for_completion(&data->prev_finished); | |
169 | ||
170 | spin_lock(&async_scan_lock); | |
171 | list_del(&data->list); | |
8bcc2412 MW |
172 | if (!list_empty(&scanning_hosts)) { |
173 | struct async_scan_data *next = list_entry(scanning_hosts.next, | |
174 | struct async_scan_data, list); | |
175 | complete(&next->prev_finished); | |
176 | } | |
3e082a91 MW |
177 | done: |
178 | spin_unlock(&async_scan_lock); | |
179 | ||
180 | kfree(data); | |
181 | return 0; | |
182 | } | |
183 | ||
184 | #ifdef MODULE | |
185 | /* Only exported for the benefit of scsi_wait_scan */ | |
186 | EXPORT_SYMBOL_GPL(scsi_complete_async_scans); | |
187 | #endif | |
188 | ||
1da177e4 LT |
189 | /** |
190 | * scsi_unlock_floptical - unlock device via a special MODE SENSE command | |
39216033 | 191 | * @sdev: scsi device to send command to |
1da177e4 LT |
192 | * @result: area to store the result of the MODE SENSE |
193 | * | |
194 | * Description: | |
39216033 | 195 | * Send a vendor specific MODE SENSE (not a MODE SELECT) command. |
1da177e4 LT |
196 | * Called for BLIST_KEY devices. |
197 | **/ | |
39216033 | 198 | static void scsi_unlock_floptical(struct scsi_device *sdev, |
1da177e4 LT |
199 | unsigned char *result) |
200 | { | |
201 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
202 | ||
203 | printk(KERN_NOTICE "scsi: unlocking floptical drive\n"); | |
204 | scsi_cmd[0] = MODE_SENSE; | |
205 | scsi_cmd[1] = 0; | |
206 | scsi_cmd[2] = 0x2e; | |
207 | scsi_cmd[3] = 0; | |
39216033 | 208 | scsi_cmd[4] = 0x2a; /* size */ |
1da177e4 | 209 | scsi_cmd[5] = 0; |
39216033 JB |
210 | scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL, |
211 | SCSI_TIMEOUT, 3); | |
1da177e4 LT |
212 | } |
213 | ||
1da177e4 LT |
214 | /** |
215 | * scsi_alloc_sdev - allocate and setup a scsi_Device | |
216 | * | |
217 | * Description: | |
218 | * Allocate, initialize for io, and return a pointer to a scsi_Device. | |
219 | * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and | |
220 | * adds scsi_Device to the appropriate list. | |
221 | * | |
222 | * Return value: | |
223 | * scsi_Device pointer, or NULL on failure. | |
224 | **/ | |
225 | static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, | |
226 | unsigned int lun, void *hostdata) | |
227 | { | |
228 | struct scsi_device *sdev; | |
229 | int display_failure_msg = 1, ret; | |
230 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
231 | ||
24669f75 | 232 | sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size, |
1da177e4 LT |
233 | GFP_ATOMIC); |
234 | if (!sdev) | |
235 | goto out; | |
236 | ||
1da177e4 LT |
237 | sdev->vendor = scsi_null_device_strs; |
238 | sdev->model = scsi_null_device_strs; | |
239 | sdev->rev = scsi_null_device_strs; | |
240 | sdev->host = shost; | |
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); | |
249 | spin_lock_init(&sdev->list_lock); | |
250 | ||
251 | sdev->sdev_gendev.parent = get_device(&starget->dev); | |
252 | sdev->sdev_target = starget; | |
253 | ||
254 | /* usually NULL and set by ->slave_alloc instead */ | |
255 | sdev->hostdata = hostdata; | |
256 | ||
257 | /* if the device needs this changing, it may do so in the | |
258 | * slave_configure function */ | |
259 | sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED; | |
260 | ||
261 | /* | |
262 | * Some low level driver could use device->type | |
263 | */ | |
264 | sdev->type = -1; | |
265 | ||
266 | /* | |
267 | * Assume that the device will have handshaking problems, | |
268 | * and then fix this field later if it turns out it | |
269 | * doesn't | |
270 | */ | |
271 | sdev->borken = 1; | |
272 | ||
1da177e4 LT |
273 | sdev->request_queue = scsi_alloc_queue(sdev); |
274 | if (!sdev->request_queue) { | |
275 | /* release fn is set up in scsi_sysfs_device_initialise, so | |
276 | * have to free and put manually here */ | |
277 | put_device(&starget->dev); | |
93f56089 | 278 | kfree(sdev); |
1da177e4 LT |
279 | goto out; |
280 | } | |
281 | ||
282 | sdev->request_queue->queuedata = sdev; | |
283 | scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun); | |
284 | ||
285 | scsi_sysfs_device_initialize(sdev); | |
286 | ||
287 | if (shost->hostt->slave_alloc) { | |
288 | ret = shost->hostt->slave_alloc(sdev); | |
289 | if (ret) { | |
290 | /* | |
291 | * if LLDD reports slave not present, don't clutter | |
292 | * console with alloc failure messages | |
1da177e4 LT |
293 | */ |
294 | if (ret == -ENXIO) | |
295 | display_failure_msg = 0; | |
296 | goto out_device_destroy; | |
297 | } | |
298 | } | |
299 | ||
300 | return sdev; | |
301 | ||
302 | out_device_destroy: | |
303 | transport_destroy_device(&sdev->sdev_gendev); | |
1da177e4 LT |
304 | put_device(&sdev->sdev_gendev); |
305 | out: | |
306 | if (display_failure_msg) | |
307 | printk(ALLOC_FAILURE_MSG, __FUNCTION__); | |
308 | return NULL; | |
309 | } | |
310 | ||
311 | static void scsi_target_dev_release(struct device *dev) | |
312 | { | |
313 | struct device *parent = dev->parent; | |
314 | struct scsi_target *starget = to_scsi_target(dev); | |
a283bd37 | 315 | |
1da177e4 LT |
316 | kfree(starget); |
317 | put_device(parent); | |
318 | } | |
319 | ||
320 | int scsi_is_target_device(const struct device *dev) | |
321 | { | |
322 | return dev->release == scsi_target_dev_release; | |
323 | } | |
324 | EXPORT_SYMBOL(scsi_is_target_device); | |
325 | ||
326 | static struct scsi_target *__scsi_find_target(struct device *parent, | |
327 | int channel, uint id) | |
328 | { | |
329 | struct scsi_target *starget, *found_starget = NULL; | |
330 | struct Scsi_Host *shost = dev_to_shost(parent); | |
331 | /* | |
332 | * Search for an existing target for this sdev. | |
333 | */ | |
334 | list_for_each_entry(starget, &shost->__targets, siblings) { | |
335 | if (starget->id == id && | |
336 | starget->channel == channel) { | |
337 | found_starget = starget; | |
338 | break; | |
339 | } | |
340 | } | |
341 | if (found_starget) | |
342 | get_device(&found_starget->dev); | |
343 | ||
344 | return found_starget; | |
345 | } | |
346 | ||
884d25cc JB |
347 | /** |
348 | * scsi_alloc_target - allocate a new or find an existing target | |
349 | * @parent: parent of the target (need not be a scsi host) | |
350 | * @channel: target channel number (zero if no channels) | |
351 | * @id: target id number | |
352 | * | |
353 | * Return an existing target if one exists, provided it hasn't already | |
354 | * gone into STARGET_DEL state, otherwise allocate a new target. | |
355 | * | |
356 | * The target is returned with an incremented reference, so the caller | |
357 | * is responsible for both reaping and doing a last put | |
358 | */ | |
1da177e4 LT |
359 | static struct scsi_target *scsi_alloc_target(struct device *parent, |
360 | int channel, uint id) | |
361 | { | |
362 | struct Scsi_Host *shost = dev_to_shost(parent); | |
363 | struct device *dev = NULL; | |
364 | unsigned long flags; | |
365 | const int size = sizeof(struct scsi_target) | |
366 | + shost->transportt->target_size; | |
5c44cd2a | 367 | struct scsi_target *starget; |
1da177e4 | 368 | struct scsi_target *found_target; |
32f95792 | 369 | int error; |
1da177e4 | 370 | |
24669f75 | 371 | starget = kzalloc(size, GFP_KERNEL); |
1da177e4 LT |
372 | if (!starget) { |
373 | printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__); | |
374 | return NULL; | |
375 | } | |
1da177e4 LT |
376 | dev = &starget->dev; |
377 | device_initialize(dev); | |
378 | starget->reap_ref = 1; | |
379 | dev->parent = get_device(parent); | |
380 | dev->release = scsi_target_dev_release; | |
381 | sprintf(dev->bus_id, "target%d:%d:%d", | |
382 | shost->host_no, channel, id); | |
383 | starget->id = id; | |
384 | starget->channel = channel; | |
385 | INIT_LIST_HEAD(&starget->siblings); | |
386 | INIT_LIST_HEAD(&starget->devices); | |
ffedb452 JB |
387 | starget->state = STARGET_RUNNING; |
388 | retry: | |
1da177e4 LT |
389 | spin_lock_irqsave(shost->host_lock, flags); |
390 | ||
391 | found_target = __scsi_find_target(parent, channel, id); | |
392 | if (found_target) | |
393 | goto found; | |
394 | ||
395 | list_add_tail(&starget->siblings, &shost->__targets); | |
396 | spin_unlock_irqrestore(shost->host_lock, flags); | |
397 | /* allocate and add */ | |
a283bd37 | 398 | transport_setup_device(dev); |
32f95792 BK |
399 | error = device_add(dev); |
400 | if (error) { | |
401 | dev_err(dev, "target device_add failed, error %d\n", error); | |
402 | spin_lock_irqsave(shost->host_lock, flags); | |
403 | list_del_init(&starget->siblings); | |
404 | spin_unlock_irqrestore(shost->host_lock, flags); | |
405 | transport_destroy_device(dev); | |
406 | put_device(parent); | |
407 | kfree(starget); | |
408 | return NULL; | |
409 | } | |
a283bd37 JB |
410 | transport_add_device(dev); |
411 | if (shost->hostt->target_alloc) { | |
32f95792 | 412 | error = shost->hostt->target_alloc(starget); |
a283bd37 JB |
413 | |
414 | if(error) { | |
415 | dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error); | |
416 | /* don't want scsi_target_reap to do the final | |
417 | * put because it will be under the host lock */ | |
418 | get_device(dev); | |
419 | scsi_target_reap(starget); | |
420 | put_device(dev); | |
421 | return NULL; | |
422 | } | |
423 | } | |
884d25cc | 424 | get_device(dev); |
a283bd37 | 425 | |
1da177e4 LT |
426 | return starget; |
427 | ||
428 | found: | |
429 | found_target->reap_ref++; | |
430 | spin_unlock_irqrestore(shost->host_lock, flags); | |
ffedb452 | 431 | if (found_target->state != STARGET_DEL) { |
884d25cc | 432 | put_device(parent); |
ffedb452 JB |
433 | kfree(starget); |
434 | return found_target; | |
435 | } | |
436 | /* Unfortunately, we found a dying target; need to | |
437 | * wait until it's dead before we can get a new one */ | |
438 | put_device(&found_target->dev); | |
439 | flush_scheduled_work(); | |
440 | goto retry; | |
1da177e4 LT |
441 | } |
442 | ||
65f27f38 | 443 | static void scsi_target_reap_usercontext(struct work_struct *work) |
65110b21 | 444 | { |
65f27f38 DH |
445 | struct scsi_target *starget = |
446 | container_of(work, struct scsi_target, ew.work); | |
863a930a JB |
447 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
448 | unsigned long flags; | |
449 | ||
ffedb452 JB |
450 | transport_remove_device(&starget->dev); |
451 | device_del(&starget->dev); | |
452 | transport_destroy_device(&starget->dev); | |
863a930a | 453 | spin_lock_irqsave(shost->host_lock, flags); |
a50a5e37 MA |
454 | if (shost->hostt->target_destroy) |
455 | shost->hostt->target_destroy(starget); | |
ffedb452 | 456 | list_del_init(&starget->siblings); |
863a930a | 457 | spin_unlock_irqrestore(shost->host_lock, flags); |
ffedb452 | 458 | put_device(&starget->dev); |
863a930a JB |
459 | } |
460 | ||
1da177e4 LT |
461 | /** |
462 | * scsi_target_reap - check to see if target is in use and destroy if not | |
463 | * | |
464 | * @starget: target to be checked | |
465 | * | |
466 | * This is used after removing a LUN or doing a last put of the target | |
467 | * it checks atomically that nothing is using the target and removes | |
468 | * it if so. | |
469 | */ | |
470 | void scsi_target_reap(struct scsi_target *starget) | |
471 | { | |
ffedb452 JB |
472 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
473 | unsigned long flags; | |
474 | ||
475 | spin_lock_irqsave(shost->host_lock, flags); | |
476 | ||
477 | if (--starget->reap_ref == 0 && list_empty(&starget->devices)) { | |
478 | BUG_ON(starget->state == STARGET_DEL); | |
479 | starget->state = STARGET_DEL; | |
480 | spin_unlock_irqrestore(shost->host_lock, flags); | |
481 | execute_in_process_context(scsi_target_reap_usercontext, | |
65f27f38 | 482 | &starget->ew); |
ffedb452 JB |
483 | return; |
484 | ||
485 | } | |
486 | spin_unlock_irqrestore(shost->host_lock, flags); | |
487 | ||
488 | return; | |
1da177e4 LT |
489 | } |
490 | ||
e5b3cd42 AS |
491 | /** |
492 | * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string | |
493 | * @s: INQUIRY result string to sanitize | |
494 | * @len: length of the string | |
495 | * | |
496 | * Description: | |
497 | * The SCSI spec says that INQUIRY vendor, product, and revision | |
498 | * strings must consist entirely of graphic ASCII characters, | |
499 | * padded on the right with spaces. Since not all devices obey | |
500 | * this rule, we will replace non-graphic or non-ASCII characters | |
501 | * with spaces. Exception: a NUL character is interpreted as a | |
502 | * string terminator, so all the following characters are set to | |
503 | * spaces. | |
504 | **/ | |
505 | static void sanitize_inquiry_string(unsigned char *s, int len) | |
506 | { | |
507 | int terminated = 0; | |
508 | ||
509 | for (; len > 0; (--len, ++s)) { | |
510 | if (*s == 0) | |
511 | terminated = 1; | |
512 | if (terminated || *s < 0x20 || *s > 0x7e) | |
513 | *s = ' '; | |
514 | } | |
515 | } | |
516 | ||
1da177e4 LT |
517 | /** |
518 | * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY | |
39216033 | 519 | * @sdev: scsi_device to probe |
1da177e4 | 520 | * @inq_result: area to store the INQUIRY result |
39216033 | 521 | * @result_len: len of inq_result |
1da177e4 LT |
522 | * @bflags: store any bflags found here |
523 | * | |
524 | * Description: | |
39216033 | 525 | * Probe the lun associated with @req using a standard SCSI INQUIRY; |
1da177e4 | 526 | * |
39216033 | 527 | * If the INQUIRY is successful, zero is returned and the |
1da177e4 | 528 | * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length |
f64a181d | 529 | * are copied to the scsi_device any flags value is stored in *@bflags. |
1da177e4 | 530 | **/ |
e5b3cd42 | 531 | static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result, |
39216033 | 532 | int result_len, int *bflags) |
1da177e4 | 533 | { |
1da177e4 LT |
534 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
535 | int first_inquiry_len, try_inquiry_len, next_inquiry_len; | |
536 | int response_len = 0; | |
39216033 | 537 | int pass, count, result; |
1da177e4 LT |
538 | struct scsi_sense_hdr sshdr; |
539 | ||
540 | *bflags = 0; | |
541 | ||
542 | /* Perform up to 3 passes. The first pass uses a conservative | |
543 | * transfer length of 36 unless sdev->inquiry_len specifies a | |
544 | * different value. */ | |
545 | first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36; | |
546 | try_inquiry_len = first_inquiry_len; | |
547 | pass = 1; | |
548 | ||
549 | next_pass: | |
9ccfc756 JB |
550 | SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
551 | "scsi scan: INQUIRY pass %d length %d\n", | |
552 | pass, try_inquiry_len)); | |
1da177e4 LT |
553 | |
554 | /* Each pass gets up to three chances to ignore Unit Attention */ | |
555 | for (count = 0; count < 3; ++count) { | |
556 | memset(scsi_cmd, 0, 6); | |
557 | scsi_cmd[0] = INQUIRY; | |
558 | scsi_cmd[4] = (unsigned char) try_inquiry_len; | |
1da177e4 LT |
559 | |
560 | memset(inq_result, 0, try_inquiry_len); | |
39216033 JB |
561 | |
562 | result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, | |
ea73a9f2 | 563 | inq_result, try_inquiry_len, &sshdr, |
39216033 | 564 | HZ / 2 + HZ * scsi_inq_timeout, 3); |
1da177e4 LT |
565 | |
566 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s " | |
567 | "with code 0x%x\n", | |
39216033 | 568 | result ? "failed" : "successful", result)); |
1da177e4 | 569 | |
39216033 | 570 | if (result) { |
1da177e4 LT |
571 | /* |
572 | * not-ready to ready transition [asc/ascq=0x28/0x0] | |
573 | * or power-on, reset [asc/ascq=0x29/0x0], continue. | |
574 | * INQUIRY should not yield UNIT_ATTENTION | |
575 | * but many buggy devices do so anyway. | |
576 | */ | |
39216033 | 577 | if ((driver_byte(result) & DRIVER_SENSE) && |
ea73a9f2 | 578 | scsi_sense_valid(&sshdr)) { |
1da177e4 LT |
579 | if ((sshdr.sense_key == UNIT_ATTENTION) && |
580 | ((sshdr.asc == 0x28) || | |
581 | (sshdr.asc == 0x29)) && | |
582 | (sshdr.ascq == 0)) | |
583 | continue; | |
584 | } | |
585 | } | |
586 | break; | |
587 | } | |
588 | ||
39216033 | 589 | if (result == 0) { |
e5b3cd42 AS |
590 | sanitize_inquiry_string(&inq_result[8], 8); |
591 | sanitize_inquiry_string(&inq_result[16], 16); | |
592 | sanitize_inquiry_string(&inq_result[32], 4); | |
593 | ||
594 | response_len = inq_result[4] + 5; | |
1da177e4 LT |
595 | if (response_len > 255) |
596 | response_len = first_inquiry_len; /* sanity */ | |
597 | ||
598 | /* | |
599 | * Get any flags for this device. | |
600 | * | |
f64a181d CH |
601 | * XXX add a bflags to scsi_device, and replace the |
602 | * corresponding bit fields in scsi_device, so bflags | |
1da177e4 LT |
603 | * need not be passed as an argument. |
604 | */ | |
605 | *bflags = scsi_get_device_flags(sdev, &inq_result[8], | |
606 | &inq_result[16]); | |
607 | ||
608 | /* When the first pass succeeds we gain information about | |
609 | * what larger transfer lengths might work. */ | |
610 | if (pass == 1) { | |
611 | if (BLIST_INQUIRY_36 & *bflags) | |
612 | next_inquiry_len = 36; | |
613 | else if (BLIST_INQUIRY_58 & *bflags) | |
614 | next_inquiry_len = 58; | |
615 | else if (sdev->inquiry_len) | |
616 | next_inquiry_len = sdev->inquiry_len; | |
617 | else | |
618 | next_inquiry_len = response_len; | |
619 | ||
620 | /* If more data is available perform the second pass */ | |
621 | if (next_inquiry_len > try_inquiry_len) { | |
622 | try_inquiry_len = next_inquiry_len; | |
623 | pass = 2; | |
624 | goto next_pass; | |
625 | } | |
626 | } | |
627 | ||
628 | } else if (pass == 2) { | |
629 | printk(KERN_INFO "scsi scan: %d byte inquiry failed. " | |
630 | "Consider BLIST_INQUIRY_36 for this device\n", | |
631 | try_inquiry_len); | |
632 | ||
633 | /* If this pass failed, the third pass goes back and transfers | |
634 | * the same amount as we successfully got in the first pass. */ | |
635 | try_inquiry_len = first_inquiry_len; | |
636 | pass = 3; | |
637 | goto next_pass; | |
638 | } | |
639 | ||
640 | /* If the last transfer attempt got an error, assume the | |
641 | * peripheral doesn't exist or is dead. */ | |
39216033 JB |
642 | if (result) |
643 | return -EIO; | |
1da177e4 LT |
644 | |
645 | /* Don't report any more data than the device says is valid */ | |
646 | sdev->inquiry_len = min(try_inquiry_len, response_len); | |
647 | ||
648 | /* | |
649 | * XXX Abort if the response length is less than 36? If less than | |
650 | * 32, the lookup of the device flags (above) could be invalid, | |
651 | * and it would be possible to take an incorrect action - we do | |
652 | * not want to hang because of a short INQUIRY. On the flip side, | |
653 | * if the device is spun down or becoming ready (and so it gives a | |
654 | * short INQUIRY), an abort here prevents any further use of the | |
655 | * device, including spin up. | |
656 | * | |
657 | * Related to the above issue: | |
658 | * | |
659 | * XXX Devices (disk or all?) should be sent a TEST UNIT READY, | |
660 | * and if not ready, sent a START_STOP to start (maybe spin up) and | |
661 | * then send the INQUIRY again, since the INQUIRY can change after | |
662 | * a device is initialized. | |
663 | * | |
664 | * Ideally, start a device if explicitly asked to do so. This | |
665 | * assumes that a device is spun up on power on, spun down on | |
666 | * request, and then spun up on request. | |
667 | */ | |
668 | ||
669 | /* | |
670 | * The scanning code needs to know the scsi_level, even if no | |
671 | * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so | |
672 | * non-zero LUNs can be scanned. | |
673 | */ | |
674 | sdev->scsi_level = inq_result[2] & 0x07; | |
675 | if (sdev->scsi_level >= 2 || | |
676 | (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1)) | |
677 | sdev->scsi_level++; | |
6f3a2024 | 678 | sdev->sdev_target->scsi_level = sdev->scsi_level; |
1da177e4 | 679 | |
39216033 | 680 | return 0; |
1da177e4 LT |
681 | } |
682 | ||
683 | /** | |
f64a181d CH |
684 | * scsi_add_lun - allocate and fully initialze a scsi_device |
685 | * @sdevscan: holds information to be stored in the new scsi_device | |
686 | * @sdevnew: store the address of the newly allocated scsi_device | |
1da177e4 LT |
687 | * @inq_result: holds the result of a previous INQUIRY to the LUN |
688 | * @bflags: black/white list flag | |
689 | * | |
690 | * Description: | |
f64a181d | 691 | * Allocate and initialize a scsi_device matching sdevscan. Optionally |
1da177e4 | 692 | * set fields based on values in *@bflags. If @sdevnew is not |
f64a181d | 693 | * NULL, store the address of the new scsi_device in *@sdevnew (needed |
1da177e4 LT |
694 | * when scanning a particular LUN). |
695 | * | |
696 | * Return: | |
f64a181d CH |
697 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device |
698 | * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized | |
1da177e4 | 699 | **/ |
e5b3cd42 | 700 | static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, |
3e082a91 | 701 | int *bflags, int async) |
1da177e4 LT |
702 | { |
703 | /* | |
704 | * XXX do not save the inquiry, since it can change underneath us, | |
705 | * save just vendor/model/rev. | |
706 | * | |
707 | * Rather than save it and have an ioctl that retrieves the saved | |
708 | * value, have an ioctl that executes the same INQUIRY code used | |
709 | * in scsi_probe_lun, let user level programs doing INQUIRY | |
710 | * scanning run at their own risk, or supply a user level program | |
711 | * that can correctly scan. | |
712 | */ | |
09123d23 AS |
713 | |
714 | /* | |
715 | * Copy at least 36 bytes of INQUIRY data, so that we don't | |
716 | * dereference unallocated memory when accessing the Vendor, | |
717 | * Product, and Revision strings. Badly behaved devices may set | |
718 | * the INQUIRY Additional Length byte to a small value, indicating | |
719 | * these strings are invalid, but often they contain plausible data | |
720 | * nonetheless. It doesn't matter if the device sent < 36 bytes | |
721 | * total, since scsi_probe_lun() initializes inq_result with 0s. | |
722 | */ | |
723 | sdev->inquiry = kmemdup(inq_result, | |
724 | max_t(size_t, sdev->inquiry_len, 36), | |
725 | GFP_ATOMIC); | |
726 | if (sdev->inquiry == NULL) | |
1da177e4 | 727 | return SCSI_SCAN_NO_RESPONSE; |
1da177e4 | 728 | |
1da177e4 LT |
729 | sdev->vendor = (char *) (sdev->inquiry + 8); |
730 | sdev->model = (char *) (sdev->inquiry + 16); | |
731 | sdev->rev = (char *) (sdev->inquiry + 32); | |
732 | ||
733 | if (*bflags & BLIST_ISROM) { | |
734 | /* | |
735 | * It would be better to modify sdev->type, and set | |
4ff36718 MW |
736 | * sdev->removable; this can now be done since |
737 | * print_inquiry has gone away. | |
1da177e4 LT |
738 | */ |
739 | inq_result[0] = TYPE_ROM; | |
740 | inq_result[1] |= 0x80; /* removable */ | |
741 | } else if (*bflags & BLIST_NO_ULD_ATTACH) | |
742 | sdev->no_uld_attach = 1; | |
743 | ||
744 | switch (sdev->type = (inq_result[0] & 0x1f)) { | |
745 | case TYPE_TAPE: | |
746 | case TYPE_DISK: | |
747 | case TYPE_PRINTER: | |
748 | case TYPE_MOD: | |
749 | case TYPE_PROCESSOR: | |
750 | case TYPE_SCANNER: | |
751 | case TYPE_MEDIUM_CHANGER: | |
752 | case TYPE_ENCLOSURE: | |
753 | case TYPE_COMM: | |
4d7db04a | 754 | case TYPE_RAID: |
631e8a13 | 755 | case TYPE_RBC: |
1da177e4 LT |
756 | sdev->writeable = 1; |
757 | break; | |
758 | case TYPE_WORM: | |
759 | case TYPE_ROM: | |
760 | sdev->writeable = 0; | |
761 | break; | |
762 | default: | |
763 | printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type); | |
764 | } | |
765 | ||
1da177e4 LT |
766 | /* |
767 | * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI | |
768 | * spec says: The device server is capable of supporting the | |
769 | * specified peripheral device type on this logical unit. However, | |
770 | * the physical device is not currently connected to this logical | |
771 | * unit. | |
772 | * | |
773 | * The above is vague, as it implies that we could treat 001 and | |
774 | * 011 the same. Stay compatible with previous code, and create a | |
f64a181d | 775 | * scsi_device for a PQ of 1 |
1da177e4 LT |
776 | * |
777 | * Don't set the device offline here; rather let the upper | |
778 | * level drivers eval the PQ to decide whether they should | |
779 | * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check. | |
780 | */ | |
781 | ||
782 | sdev->inq_periph_qual = (inq_result[0] >> 5) & 7; | |
783 | sdev->removable = (0x80 & inq_result[1]) >> 7; | |
784 | sdev->lockable = sdev->removable; | |
785 | sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2); | |
786 | ||
787 | if (sdev->scsi_level >= SCSI_3 || (sdev->inquiry_len > 56 && | |
788 | inq_result[56] & 0x04)) | |
789 | sdev->ppr = 1; | |
790 | if (inq_result[7] & 0x60) | |
791 | sdev->wdtr = 1; | |
792 | if (inq_result[7] & 0x10) | |
793 | sdev->sdtr = 1; | |
794 | ||
19ac0db3 | 795 | sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d " |
4ff36718 MW |
796 | "ANSI: %d%s\n", scsi_device_type(sdev->type), |
797 | sdev->vendor, sdev->model, sdev->rev, | |
798 | sdev->inq_periph_qual, inq_result[2] & 0x07, | |
799 | (inq_result[3] & 0x0f) == 1 ? " CCS" : ""); | |
800 | ||
1da177e4 | 801 | /* |
5e3c34c1 | 802 | * End sysfs code. |
1da177e4 LT |
803 | */ |
804 | ||
805 | if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) && | |
806 | !(*bflags & BLIST_NOTQ)) | |
807 | sdev->tagged_supported = 1; | |
808 | /* | |
809 | * Some devices (Texel CD ROM drives) have handshaking problems | |
810 | * when used with the Seagate controllers. borken is initialized | |
811 | * to 1, and then set it to 0 here. | |
812 | */ | |
813 | if ((*bflags & BLIST_BORKEN) == 0) | |
814 | sdev->borken = 0; | |
815 | ||
816 | /* | |
817 | * Apparently some really broken devices (contrary to the SCSI | |
818 | * standards) need to be selected without asserting ATN | |
819 | */ | |
820 | if (*bflags & BLIST_SELECT_NO_ATN) | |
821 | sdev->select_no_atn = 1; | |
822 | ||
4d7db04a JB |
823 | /* |
824 | * Maximum 512 sector transfer length | |
825 | * broken RA4x00 Compaq Disk Array | |
826 | */ | |
827 | if (*bflags & BLIST_MAX_512) | |
828 | blk_queue_max_sectors(sdev->request_queue, 512); | |
829 | ||
1da177e4 LT |
830 | /* |
831 | * Some devices may not want to have a start command automatically | |
832 | * issued when a device is added. | |
833 | */ | |
834 | if (*bflags & BLIST_NOSTARTONADD) | |
835 | sdev->no_start_on_add = 1; | |
836 | ||
837 | if (*bflags & BLIST_SINGLELUN) | |
838 | sdev->single_lun = 1; | |
839 | ||
840 | ||
841 | sdev->use_10_for_rw = 1; | |
842 | ||
843 | if (*bflags & BLIST_MS_SKIP_PAGE_08) | |
844 | sdev->skip_ms_page_8 = 1; | |
845 | ||
846 | if (*bflags & BLIST_MS_SKIP_PAGE_3F) | |
847 | sdev->skip_ms_page_3f = 1; | |
848 | ||
849 | if (*bflags & BLIST_USE_10_BYTE_MS) | |
850 | sdev->use_10_for_ms = 1; | |
851 | ||
852 | /* set the device running here so that slave configure | |
853 | * may do I/O */ | |
854 | scsi_device_set_state(sdev, SDEV_RUNNING); | |
855 | ||
856 | if (*bflags & BLIST_MS_192_BYTES_FOR_3F) | |
857 | sdev->use_192_bytes_for_3f = 1; | |
858 | ||
859 | if (*bflags & BLIST_NOT_LOCKABLE) | |
860 | sdev->lockable = 0; | |
861 | ||
862 | if (*bflags & BLIST_RETRY_HWERROR) | |
863 | sdev->retry_hwerror = 1; | |
864 | ||
865 | transport_configure_device(&sdev->sdev_gendev); | |
866 | ||
93805091 CH |
867 | if (sdev->host->hostt->slave_configure) { |
868 | int ret = sdev->host->hostt->slave_configure(sdev); | |
869 | if (ret) { | |
870 | /* | |
871 | * if LLDD reports slave not present, don't clutter | |
872 | * console with alloc failure messages | |
873 | */ | |
874 | if (ret != -ENXIO) { | |
875 | sdev_printk(KERN_ERR, sdev, | |
876 | "failed to configure device\n"); | |
877 | } | |
878 | return SCSI_SCAN_NO_RESPONSE; | |
879 | } | |
880 | } | |
1da177e4 LT |
881 | |
882 | /* | |
883 | * Ok, the device is now all set up, we can | |
884 | * register it and tell the rest of the kernel | |
885 | * about it. | |
886 | */ | |
3e082a91 | 887 | if (!async && scsi_sysfs_add_sdev(sdev) != 0) |
b24b1033 | 888 | return SCSI_SCAN_NO_RESPONSE; |
1da177e4 LT |
889 | |
890 | return SCSI_SCAN_LUN_PRESENT; | |
891 | } | |
892 | ||
6f3a2024 JB |
893 | static inline void scsi_destroy_sdev(struct scsi_device *sdev) |
894 | { | |
309bd271 | 895 | scsi_device_set_state(sdev, SDEV_DEL); |
6f3a2024 JB |
896 | if (sdev->host->hostt->slave_destroy) |
897 | sdev->host->hostt->slave_destroy(sdev); | |
898 | transport_destroy_device(&sdev->sdev_gendev); | |
899 | put_device(&sdev->sdev_gendev); | |
900 | } | |
901 | ||
c5f2e640 | 902 | #ifdef CONFIG_SCSI_LOGGING |
6c7154c9 KG |
903 | /** |
904 | * scsi_inq_str - print INQUIRY data from min to max index, | |
905 | * strip trailing whitespace | |
906 | * @buf: Output buffer with at least end-first+1 bytes of space | |
907 | * @inq: Inquiry buffer (input) | |
908 | * @first: Offset of string into inq | |
909 | * @end: Index after last character in inq | |
910 | */ | |
c5f2e640 | 911 | static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq, |
6c7154c9 KG |
912 | unsigned first, unsigned end) |
913 | { | |
914 | unsigned term = 0, idx; | |
c5f2e640 | 915 | |
916 | for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) { | |
917 | if (inq[idx+first] > ' ') { | |
6c7154c9 KG |
918 | buf[idx] = inq[idx+first]; |
919 | term = idx+1; | |
920 | } else { | |
921 | buf[idx] = ' '; | |
922 | } | |
923 | } | |
924 | buf[term] = 0; | |
925 | return buf; | |
926 | } | |
c5f2e640 | 927 | #endif |
6f3a2024 | 928 | |
1da177e4 LT |
929 | /** |
930 | * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it | |
931 | * @starget: pointer to target device structure | |
932 | * @lun: LUN of target device | |
f64a181d CH |
933 | * @sdevscan: probe the LUN corresponding to this scsi_device |
934 | * @sdevnew: store the value of any new scsi_device allocated | |
1da177e4 LT |
935 | * @bflagsp: store bflags here if not NULL |
936 | * | |
937 | * Description: | |
938 | * Call scsi_probe_lun, if a LUN with an attached device is found, | |
939 | * allocate and set it up by calling scsi_add_lun. | |
940 | * | |
941 | * Return: | |
f64a181d | 942 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device |
1da177e4 LT |
943 | * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is |
944 | * attached at the LUN | |
f64a181d | 945 | * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized |
1da177e4 LT |
946 | **/ |
947 | static int scsi_probe_and_add_lun(struct scsi_target *starget, | |
948 | uint lun, int *bflagsp, | |
949 | struct scsi_device **sdevp, int rescan, | |
950 | void *hostdata) | |
951 | { | |
952 | struct scsi_device *sdev; | |
1da177e4 | 953 | unsigned char *result; |
39216033 | 954 | int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256; |
1da177e4 LT |
955 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
956 | ||
957 | /* | |
958 | * The rescan flag is used as an optimization, the first scan of a | |
959 | * host adapter calls into here with rescan == 0. | |
960 | */ | |
6f3a2024 JB |
961 | sdev = scsi_device_lookup_by_target(starget, lun); |
962 | if (sdev) { | |
963 | if (rescan || sdev->sdev_state != SDEV_CREATED) { | |
1da177e4 LT |
964 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO |
965 | "scsi scan: device exists on %s\n", | |
966 | sdev->sdev_gendev.bus_id)); | |
967 | if (sdevp) | |
968 | *sdevp = sdev; | |
969 | else | |
970 | scsi_device_put(sdev); | |
971 | ||
972 | if (bflagsp) | |
973 | *bflagsp = scsi_get_device_flags(sdev, | |
974 | sdev->vendor, | |
975 | sdev->model); | |
976 | return SCSI_SCAN_LUN_PRESENT; | |
977 | } | |
6f3a2024 JB |
978 | scsi_device_put(sdev); |
979 | } else | |
980 | sdev = scsi_alloc_sdev(starget, lun, hostdata); | |
1da177e4 LT |
981 | if (!sdev) |
982 | goto out; | |
39216033 JB |
983 | |
984 | result = kmalloc(result_len, GFP_ATOMIC | | |
bc86120a | 985 | ((shost->unchecked_isa_dma) ? __GFP_DMA : 0)); |
1da177e4 | 986 | if (!result) |
39216033 | 987 | goto out_free_sdev; |
1da177e4 | 988 | |
39216033 | 989 | if (scsi_probe_lun(sdev, result, result_len, &bflags)) |
1da177e4 LT |
990 | goto out_free_result; |
991 | ||
4186ab19 KG |
992 | if (bflagsp) |
993 | *bflagsp = bflags; | |
1da177e4 LT |
994 | /* |
995 | * result contains valid SCSI INQUIRY data. | |
996 | */ | |
13f7e5ac | 997 | if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) { |
1da177e4 LT |
998 | /* |
999 | * For a Peripheral qualifier 3 (011b), the SCSI | |
1000 | * spec says: The device server is not capable of | |
1001 | * supporting a physical device on this logical | |
1002 | * unit. | |
1003 | * | |
1004 | * For disks, this implies that there is no | |
1005 | * logical disk configured at sdev->lun, but there | |
1006 | * is a target id responding. | |
1007 | */ | |
6c7154c9 KG |
1008 | SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:" |
1009 | " peripheral qualifier of 3, device not" | |
1010 | " added\n")) | |
1011 | if (lun == 0) { | |
c5f2e640 | 1012 | SCSI_LOG_SCAN_BUS(1, { |
1013 | unsigned char vend[9]; | |
1014 | unsigned char mod[17]; | |
1015 | ||
1016 | sdev_printk(KERN_INFO, sdev, | |
6c7154c9 KG |
1017 | "scsi scan: consider passing scsi_mod." |
1018 | "dev_flags=%s:%s:0x240 or 0x800240\n", | |
1019 | scsi_inq_str(vend, result, 8, 16), | |
c5f2e640 | 1020 | scsi_inq_str(mod, result, 16, 32)); |
1021 | }); | |
6c7154c9 KG |
1022 | } |
1023 | ||
1da177e4 LT |
1024 | res = SCSI_SCAN_TARGET_PRESENT; |
1025 | goto out_free_result; | |
1026 | } | |
1027 | ||
1bfc5d9d | 1028 | /* |
84961f28 | 1029 | * Some targets may set slight variations of PQ and PDT to signal |
1030 | * that no LUN is present, so don't add sdev in these cases. | |
1031 | * Two specific examples are: | |
1032 | * 1) NetApp targets: return PQ=1, PDT=0x1f | |
1033 | * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved" | |
1034 | * in the UFI 1.0 spec (we cannot rely on reserved bits). | |
1035 | * | |
1036 | * References: | |
1037 | * 1) SCSI SPC-3, pp. 145-146 | |
1038 | * PQ=1: "A peripheral device having the specified peripheral | |
1039 | * device type is not connected to this logical unit. However, the | |
1040 | * device server is capable of supporting the specified peripheral | |
1041 | * device type on this logical unit." | |
1042 | * PDT=0x1f: "Unknown or no device type" | |
1043 | * 2) USB UFI 1.0, p. 20 | |
1044 | * PDT=00h Direct-access device (floppy) | |
1045 | * PDT=1Fh none (no FDD connected to the requested logical unit) | |
1bfc5d9d | 1046 | */ |
84961f28 | 1047 | if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) && |
1048 | (result[0] & 0x1f) == 0x1f) { | |
1bfc5d9d AS |
1049 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO |
1050 | "scsi scan: peripheral device type" | |
1051 | " of 31, no device added\n")); | |
1052 | res = SCSI_SCAN_TARGET_PRESENT; | |
1053 | goto out_free_result; | |
1054 | } | |
1055 | ||
3e082a91 | 1056 | res = scsi_add_lun(sdev, result, &bflags, shost->async_scan); |
1da177e4 LT |
1057 | if (res == SCSI_SCAN_LUN_PRESENT) { |
1058 | if (bflags & BLIST_KEY) { | |
1059 | sdev->lockable = 0; | |
39216033 | 1060 | scsi_unlock_floptical(sdev, result); |
1da177e4 | 1061 | } |
1da177e4 LT |
1062 | } |
1063 | ||
1064 | out_free_result: | |
1065 | kfree(result); | |
1da177e4 LT |
1066 | out_free_sdev: |
1067 | if (res == SCSI_SCAN_LUN_PRESENT) { | |
1068 | if (sdevp) { | |
b70d37bf AS |
1069 | if (scsi_device_get(sdev) == 0) { |
1070 | *sdevp = sdev; | |
1071 | } else { | |
1072 | __scsi_remove_device(sdev); | |
1073 | res = SCSI_SCAN_NO_RESPONSE; | |
1074 | } | |
1da177e4 | 1075 | } |
6f3a2024 JB |
1076 | } else |
1077 | scsi_destroy_sdev(sdev); | |
1da177e4 LT |
1078 | out: |
1079 | return res; | |
1080 | } | |
1081 | ||
1082 | /** | |
1083 | * scsi_sequential_lun_scan - sequentially scan a SCSI target | |
1084 | * @starget: pointer to target structure to scan | |
1085 | * @bflags: black/white list flag for LUN 0 | |
1da177e4 LT |
1086 | * |
1087 | * Description: | |
1088 | * Generally, scan from LUN 1 (LUN 0 is assumed to already have been | |
1089 | * scanned) to some maximum lun until a LUN is found with no device | |
1090 | * attached. Use the bflags to figure out any oddities. | |
1091 | * | |
1092 | * Modifies sdevscan->lun. | |
1093 | **/ | |
1094 | static void scsi_sequential_lun_scan(struct scsi_target *starget, | |
4186ab19 | 1095 | int bflags, int scsi_level, int rescan) |
1da177e4 LT |
1096 | { |
1097 | unsigned int sparse_lun, lun, max_dev_lun; | |
1098 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
1099 | ||
1100 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of" | |
1101 | "%s\n", starget->dev.bus_id)); | |
1102 | ||
1103 | max_dev_lun = min(max_scsi_luns, shost->max_lun); | |
1104 | /* | |
1105 | * If this device is known to support sparse multiple units, | |
1106 | * override the other settings, and scan all of them. Normally, | |
1107 | * SCSI-3 devices should be scanned via the REPORT LUNS. | |
1108 | */ | |
1109 | if (bflags & BLIST_SPARSELUN) { | |
1110 | max_dev_lun = shost->max_lun; | |
1111 | sparse_lun = 1; | |
1112 | } else | |
1113 | sparse_lun = 0; | |
1114 | ||
1da177e4 LT |
1115 | /* |
1116 | * If less than SCSI_1_CSS, and no special lun scaning, stop | |
1117 | * scanning; this matches 2.4 behaviour, but could just be a bug | |
1118 | * (to continue scanning a SCSI_1_CSS device). | |
1119 | * | |
1120 | * This test is broken. We might not have any device on lun0 for | |
1121 | * a sparselun device, and if that's the case then how would we | |
1122 | * know the real scsi_level, eh? It might make sense to just not | |
1123 | * scan any SCSI_1 device for non-0 luns, but that check would best | |
1124 | * go into scsi_alloc_sdev() and just have it return null when asked | |
1125 | * to alloc an sdev for lun > 0 on an already found SCSI_1 device. | |
1126 | * | |
1127 | if ((sdevscan->scsi_level < SCSI_1_CCS) && | |
1128 | ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN)) | |
1129 | == 0)) | |
1130 | return; | |
1131 | */ | |
1132 | /* | |
1133 | * If this device is known to support multiple units, override | |
1134 | * the other settings, and scan all of them. | |
1135 | */ | |
1136 | if (bflags & BLIST_FORCELUN) | |
1137 | max_dev_lun = shost->max_lun; | |
1138 | /* | |
1139 | * REGAL CDC-4X: avoid hang after LUN 4 | |
1140 | */ | |
1141 | if (bflags & BLIST_MAX5LUN) | |
1142 | max_dev_lun = min(5U, max_dev_lun); | |
1143 | /* | |
1144 | * Do not scan SCSI-2 or lower device past LUN 7, unless | |
1145 | * BLIST_LARGELUN. | |
1146 | */ | |
1147 | if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN)) | |
1148 | max_dev_lun = min(8U, max_dev_lun); | |
1149 | ||
1150 | /* | |
1151 | * We have already scanned LUN 0, so start at LUN 1. Keep scanning | |
1152 | * until we reach the max, or no LUN is found and we are not | |
1153 | * sparse_lun. | |
1154 | */ | |
1155 | for (lun = 1; lun < max_dev_lun; ++lun) | |
1156 | if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, | |
1157 | NULL) != SCSI_SCAN_LUN_PRESENT) && | |
1158 | !sparse_lun) | |
1159 | return; | |
1160 | } | |
1161 | ||
1162 | /** | |
1163 | * scsilun_to_int: convert a scsi_lun to an int | |
1164 | * @scsilun: struct scsi_lun to be converted. | |
1165 | * | |
1166 | * Description: | |
1167 | * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered | |
1168 | * integer, and return the result. The caller must check for | |
1169 | * truncation before using this function. | |
1170 | * | |
1171 | * Notes: | |
1172 | * The struct scsi_lun is assumed to be four levels, with each level | |
1173 | * effectively containing a SCSI byte-ordered (big endian) short; the | |
1174 | * addressing bits of each level are ignored (the highest two bits). | |
1175 | * For a description of the LUN format, post SCSI-3 see the SCSI | |
1176 | * Architecture Model, for SCSI-3 see the SCSI Controller Commands. | |
1177 | * | |
1178 | * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns | |
1179 | * the integer: 0x0b030a04 | |
1180 | **/ | |
1181 | static int scsilun_to_int(struct scsi_lun *scsilun) | |
1182 | { | |
1183 | int i; | |
1184 | unsigned int lun; | |
1185 | ||
1186 | lun = 0; | |
1187 | for (i = 0; i < sizeof(lun); i += 2) | |
1188 | lun = lun | (((scsilun->scsi_lun[i] << 8) | | |
1189 | scsilun->scsi_lun[i + 1]) << (i * 8)); | |
1190 | return lun; | |
1191 | } | |
1192 | ||
2f4701d8 JSEC |
1193 | /** |
1194 | * int_to_scsilun: reverts an int into a scsi_lun | |
1195 | * @int: integer to be reverted | |
1196 | * @scsilun: struct scsi_lun to be set. | |
1197 | * | |
1198 | * Description: | |
1199 | * Reverts the functionality of the scsilun_to_int, which packed | |
1200 | * an 8-byte lun value into an int. This routine unpacks the int | |
1201 | * back into the lun value. | |
1202 | * Note: the scsilun_to_int() routine does not truly handle all | |
1203 | * 8bytes of the lun value. This functions restores only as much | |
1204 | * as was set by the routine. | |
1205 | * | |
1206 | * Notes: | |
1207 | * Given an integer : 0x0b030a04, this function returns a | |
1208 | * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00 | |
1209 | * | |
1210 | **/ | |
1211 | void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun) | |
1212 | { | |
1213 | int i; | |
1214 | ||
1215 | memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun)); | |
1216 | ||
1217 | for (i = 0; i < sizeof(lun); i += 2) { | |
1218 | scsilun->scsi_lun[i] = (lun >> 8) & 0xFF; | |
1219 | scsilun->scsi_lun[i+1] = lun & 0xFF; | |
1220 | lun = lun >> 16; | |
1221 | } | |
1222 | } | |
1223 | EXPORT_SYMBOL(int_to_scsilun); | |
1224 | ||
1da177e4 LT |
1225 | /** |
1226 | * scsi_report_lun_scan - Scan using SCSI REPORT LUN results | |
f64a181d | 1227 | * @sdevscan: scan the host, channel, and id of this scsi_device |
1da177e4 LT |
1228 | * |
1229 | * Description: | |
1230 | * If @sdevscan is for a SCSI-3 or up device, send a REPORT LUN | |
1231 | * command, and scan the resulting list of LUNs by calling | |
1232 | * scsi_probe_and_add_lun. | |
1233 | * | |
1234 | * Modifies sdevscan->lun. | |
1235 | * | |
1236 | * Return: | |
1237 | * 0: scan completed (or no memory, so further scanning is futile) | |
1238 | * 1: no report lun scan, or not configured | |
1239 | **/ | |
6f3a2024 | 1240 | static int scsi_report_lun_scan(struct scsi_target *starget, int bflags, |
1da177e4 LT |
1241 | int rescan) |
1242 | { | |
1243 | char devname[64]; | |
1244 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
1245 | unsigned int length; | |
1246 | unsigned int lun; | |
1247 | unsigned int num_luns; | |
1248 | unsigned int retries; | |
39216033 | 1249 | int result; |
1da177e4 | 1250 | struct scsi_lun *lunp, *lun_data; |
1da177e4 LT |
1251 | u8 *data; |
1252 | struct scsi_sense_hdr sshdr; | |
6f3a2024 JB |
1253 | struct scsi_device *sdev; |
1254 | struct Scsi_Host *shost = dev_to_shost(&starget->dev); | |
2ef89198 | 1255 | int ret = 0; |
1da177e4 LT |
1256 | |
1257 | /* | |
1258 | * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set. | |
1259 | * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does | |
1260 | * support more than 8 LUNs. | |
1261 | */ | |
4d7db04a JB |
1262 | if (bflags & BLIST_NOREPORTLUN) |
1263 | return 1; | |
1264 | if (starget->scsi_level < SCSI_2 && | |
1265 | starget->scsi_level != SCSI_UNKNOWN) | |
1266 | return 1; | |
1267 | if (starget->scsi_level < SCSI_3 && | |
1268 | (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) | |
1da177e4 LT |
1269 | return 1; |
1270 | if (bflags & BLIST_NOLUN) | |
1271 | return 0; | |
1272 | ||
6f3a2024 JB |
1273 | if (!(sdev = scsi_device_lookup_by_target(starget, 0))) { |
1274 | sdev = scsi_alloc_sdev(starget, 0, NULL); | |
1275 | if (!sdev) | |
1276 | return 0; | |
1277 | if (scsi_device_get(sdev)) | |
1278 | return 0; | |
1279 | } | |
1280 | ||
1da177e4 | 1281 | sprintf(devname, "host %d channel %d id %d", |
6f3a2024 | 1282 | shost->host_no, sdev->channel, sdev->id); |
1da177e4 LT |
1283 | |
1284 | /* | |
1285 | * Allocate enough to hold the header (the same size as one scsi_lun) | |
1286 | * plus the max number of luns we are requesting. | |
1287 | * | |
1288 | * Reallocating and trying again (with the exact amount we need) | |
1289 | * would be nice, but then we need to somehow limit the size | |
1290 | * allocated based on the available memory and the limits of | |
1291 | * kmalloc - we don't want a kmalloc() failure of a huge value to | |
1292 | * prevent us from finding any LUNs on this target. | |
1293 | */ | |
1294 | length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun); | |
1295 | lun_data = kmalloc(length, GFP_ATOMIC | | |
1296 | (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0)); | |
6f3a2024 JB |
1297 | if (!lun_data) { |
1298 | printk(ALLOC_FAILURE_MSG, __FUNCTION__); | |
39216033 | 1299 | goto out; |
6f3a2024 | 1300 | } |
1da177e4 LT |
1301 | |
1302 | scsi_cmd[0] = REPORT_LUNS; | |
1303 | ||
1304 | /* | |
1305 | * bytes 1 - 5: reserved, set to zero. | |
1306 | */ | |
1307 | memset(&scsi_cmd[1], 0, 5); | |
1308 | ||
1309 | /* | |
1310 | * bytes 6 - 9: length of the command. | |
1311 | */ | |
1312 | scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff; | |
1313 | scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff; | |
1314 | scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff; | |
1315 | scsi_cmd[9] = (unsigned char) length & 0xff; | |
1316 | ||
1317 | scsi_cmd[10] = 0; /* reserved */ | |
1318 | scsi_cmd[11] = 0; /* control */ | |
1da177e4 LT |
1319 | |
1320 | /* | |
1321 | * We can get a UNIT ATTENTION, for example a power on/reset, so | |
1322 | * retry a few times (like sd.c does for TEST UNIT READY). | |
1323 | * Experience shows some combinations of adapter/devices get at | |
1324 | * least two power on/resets. | |
1325 | * | |
1326 | * Illegal requests (for devices that do not support REPORT LUNS) | |
1327 | * should come through as a check condition, and will not generate | |
1328 | * a retry. | |
1329 | */ | |
1330 | for (retries = 0; retries < 3; retries++) { | |
1331 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending" | |
1332 | " REPORT LUNS to %s (try %d)\n", devname, | |
1333 | retries)); | |
39216033 | 1334 | |
39216033 | 1335 | result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, |
ea73a9f2 | 1336 | lun_data, length, &sshdr, |
39216033 JB |
1337 | SCSI_TIMEOUT + 4 * HZ, 3); |
1338 | ||
1da177e4 | 1339 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS" |
39216033 JB |
1340 | " %s (try %d) result 0x%x\n", result |
1341 | ? "failed" : "successful", retries, result)); | |
1342 | if (result == 0) | |
1da177e4 | 1343 | break; |
ea73a9f2 | 1344 | else if (scsi_sense_valid(&sshdr)) { |
1da177e4 LT |
1345 | if (sshdr.sense_key != UNIT_ATTENTION) |
1346 | break; | |
1347 | } | |
1348 | } | |
1349 | ||
39216033 | 1350 | if (result) { |
1da177e4 LT |
1351 | /* |
1352 | * The device probably does not support a REPORT LUN command | |
1353 | */ | |
2ef89198 AS |
1354 | ret = 1; |
1355 | goto out_err; | |
1da177e4 | 1356 | } |
1da177e4 LT |
1357 | |
1358 | /* | |
1359 | * Get the length from the first four bytes of lun_data. | |
1360 | */ | |
1361 | data = (u8 *) lun_data->scsi_lun; | |
1362 | length = ((data[0] << 24) | (data[1] << 16) | | |
1363 | (data[2] << 8) | (data[3] << 0)); | |
1364 | ||
1365 | num_luns = (length / sizeof(struct scsi_lun)); | |
1366 | if (num_luns > max_scsi_report_luns) { | |
1367 | printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)" | |
1368 | " of %d luns reported, try increasing" | |
1369 | " max_scsi_report_luns.\n", devname, | |
1370 | max_scsi_report_luns, num_luns); | |
1371 | num_luns = max_scsi_report_luns; | |
1372 | } | |
1373 | ||
3bf743e7 JG |
1374 | SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, |
1375 | "scsi scan: REPORT LUN scan\n")); | |
1da177e4 LT |
1376 | |
1377 | /* | |
1378 | * Scan the luns in lun_data. The entry at offset 0 is really | |
1379 | * the header, so start at 1 and go up to and including num_luns. | |
1380 | */ | |
1381 | for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) { | |
1382 | lun = scsilun_to_int(lunp); | |
1383 | ||
1384 | /* | |
1385 | * Check if the unused part of lunp is non-zero, and so | |
1386 | * does not fit in lun. | |
1387 | */ | |
1388 | if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) { | |
1389 | int i; | |
1390 | ||
1391 | /* | |
1392 | * Output an error displaying the LUN in byte order, | |
1393 | * this differs from what linux would print for the | |
1394 | * integer LUN value. | |
1395 | */ | |
1396 | printk(KERN_WARNING "scsi: %s lun 0x", devname); | |
1397 | data = (char *)lunp->scsi_lun; | |
1398 | for (i = 0; i < sizeof(struct scsi_lun); i++) | |
1399 | printk("%02x", data[i]); | |
1400 | printk(" has a LUN larger than currently supported.\n"); | |
1da177e4 LT |
1401 | } else if (lun > sdev->host->max_lun) { |
1402 | printk(KERN_WARNING "scsi: %s lun%d has a LUN larger" | |
1403 | " than allowed by the host adapter\n", | |
1404 | devname, lun); | |
1405 | } else { | |
1406 | int res; | |
1407 | ||
1408 | res = scsi_probe_and_add_lun(starget, | |
1409 | lun, NULL, NULL, rescan, NULL); | |
1410 | if (res == SCSI_SCAN_NO_RESPONSE) { | |
1411 | /* | |
1412 | * Got some results, but now none, abort. | |
1413 | */ | |
3bf743e7 JG |
1414 | sdev_printk(KERN_ERR, sdev, |
1415 | "Unexpected response" | |
1416 | " from lun %d while scanning, scan" | |
1417 | " aborted\n", lun); | |
1da177e4 LT |
1418 | break; |
1419 | } | |
1420 | } | |
1421 | } | |
1422 | ||
2ef89198 | 1423 | out_err: |
1da177e4 | 1424 | kfree(lun_data); |
1da177e4 | 1425 | out: |
6f3a2024 JB |
1426 | scsi_device_put(sdev); |
1427 | if (sdev->sdev_state == SDEV_CREATED) | |
1428 | /* | |
1429 | * the sdev we used didn't appear in the report luns scan | |
1430 | */ | |
1431 | scsi_destroy_sdev(sdev); | |
2ef89198 | 1432 | return ret; |
1da177e4 LT |
1433 | } |
1434 | ||
1435 | struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel, | |
1436 | uint id, uint lun, void *hostdata) | |
1437 | { | |
a97a83a0 | 1438 | struct scsi_device *sdev = ERR_PTR(-ENODEV); |
1da177e4 | 1439 | struct device *parent = &shost->shost_gendev; |
e02f3f59 | 1440 | struct scsi_target *starget; |
1da177e4 | 1441 | |
e02f3f59 | 1442 | starget = scsi_alloc_target(parent, channel, id); |
1da177e4 LT |
1443 | if (!starget) |
1444 | return ERR_PTR(-ENOMEM); | |
1445 | ||
0b950672 | 1446 | mutex_lock(&shost->scan_mutex); |
a97a83a0 MW |
1447 | if (scsi_host_scan_allowed(shost)) |
1448 | scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata); | |
0b950672 | 1449 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
1450 | scsi_target_reap(starget); |
1451 | put_device(&starget->dev); | |
1452 | ||
1453 | return sdev; | |
1454 | } | |
1455 | EXPORT_SYMBOL(__scsi_add_device); | |
1456 | ||
146f7262 JB |
1457 | int scsi_add_device(struct Scsi_Host *host, uint channel, |
1458 | uint target, uint lun) | |
1459 | { | |
1460 | struct scsi_device *sdev = | |
1461 | __scsi_add_device(host, channel, target, lun, NULL); | |
1462 | if (IS_ERR(sdev)) | |
1463 | return PTR_ERR(sdev); | |
1464 | ||
1465 | scsi_device_put(sdev); | |
1466 | return 0; | |
1467 | } | |
1468 | EXPORT_SYMBOL(scsi_add_device); | |
1469 | ||
1da177e4 LT |
1470 | void scsi_rescan_device(struct device *dev) |
1471 | { | |
1472 | struct scsi_driver *drv; | |
1473 | ||
1474 | if (!dev->driver) | |
1475 | return; | |
1476 | ||
1477 | drv = to_scsi_driver(dev->driver); | |
1478 | if (try_module_get(drv->owner)) { | |
1479 | if (drv->rescan) | |
1480 | drv->rescan(dev); | |
1481 | module_put(drv->owner); | |
1482 | } | |
1483 | } | |
1484 | EXPORT_SYMBOL(scsi_rescan_device); | |
1485 | ||
e517d313 AS |
1486 | static void __scsi_scan_target(struct device *parent, unsigned int channel, |
1487 | unsigned int id, unsigned int lun, int rescan) | |
1da177e4 LT |
1488 | { |
1489 | struct Scsi_Host *shost = dev_to_shost(parent); | |
1490 | int bflags = 0; | |
1491 | int res; | |
1da177e4 LT |
1492 | struct scsi_target *starget; |
1493 | ||
1494 | if (shost->this_id == id) | |
1495 | /* | |
1496 | * Don't scan the host adapter | |
1497 | */ | |
1498 | return; | |
1499 | ||
1da177e4 | 1500 | starget = scsi_alloc_target(parent, channel, id); |
1da177e4 LT |
1501 | if (!starget) |
1502 | return; | |
1503 | ||
1da177e4 LT |
1504 | if (lun != SCAN_WILD_CARD) { |
1505 | /* | |
1506 | * Scan for a specific host/chan/id/lun. | |
1507 | */ | |
1508 | scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL); | |
1509 | goto out_reap; | |
1510 | } | |
1511 | ||
1512 | /* | |
1513 | * Scan LUN 0, if there is some response, scan further. Ideally, we | |
1514 | * would not configure LUN 0 until all LUNs are scanned. | |
1515 | */ | |
6f3a2024 JB |
1516 | res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL); |
1517 | if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) { | |
1518 | if (scsi_report_lun_scan(starget, bflags, rescan) != 0) | |
1da177e4 LT |
1519 | /* |
1520 | * The REPORT LUN did not scan the target, | |
1521 | * do a sequential scan. | |
1522 | */ | |
1523 | scsi_sequential_lun_scan(starget, bflags, | |
4186ab19 | 1524 | starget->scsi_level, rescan); |
1da177e4 | 1525 | } |
1da177e4 LT |
1526 | |
1527 | out_reap: | |
1528 | /* now determine if the target has any children at all | |
1529 | * and if not, nuke it */ | |
1530 | scsi_target_reap(starget); | |
1531 | ||
1532 | put_device(&starget->dev); | |
1533 | } | |
e517d313 AS |
1534 | |
1535 | /** | |
1536 | * scsi_scan_target - scan a target id, possibly including all LUNs on the | |
1537 | * target. | |
1538 | * @parent: host to scan | |
1539 | * @channel: channel to scan | |
1540 | * @id: target id to scan | |
1541 | * @lun: Specific LUN to scan or SCAN_WILD_CARD | |
1542 | * @rescan: passed to LUN scanning routines | |
1543 | * | |
1544 | * Description: | |
1545 | * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0, | |
1546 | * and possibly all LUNs on the target id. | |
1547 | * | |
1548 | * First try a REPORT LUN scan, if that does not scan the target, do a | |
1549 | * sequential scan of LUNs on the target id. | |
1550 | **/ | |
1551 | void scsi_scan_target(struct device *parent, unsigned int channel, | |
1552 | unsigned int id, unsigned int lun, int rescan) | |
1553 | { | |
1554 | struct Scsi_Host *shost = dev_to_shost(parent); | |
1555 | ||
93b45af5 MW |
1556 | if (strncmp(scsi_scan_type, "none", 4) == 0) |
1557 | return; | |
1558 | ||
3e082a91 MW |
1559 | if (!shost->async_scan) |
1560 | scsi_complete_async_scans(); | |
1561 | ||
0b950672 | 1562 | mutex_lock(&shost->scan_mutex); |
e517d313 AS |
1563 | if (scsi_host_scan_allowed(shost)) |
1564 | __scsi_scan_target(parent, channel, id, lun, rescan); | |
0b950672 | 1565 | mutex_unlock(&shost->scan_mutex); |
e517d313 | 1566 | } |
1da177e4 LT |
1567 | EXPORT_SYMBOL(scsi_scan_target); |
1568 | ||
1569 | static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel, | |
1570 | unsigned int id, unsigned int lun, int rescan) | |
1571 | { | |
1572 | uint order_id; | |
1573 | ||
1574 | if (id == SCAN_WILD_CARD) | |
1575 | for (id = 0; id < shost->max_id; ++id) { | |
1576 | /* | |
1577 | * XXX adapter drivers when possible (FCP, iSCSI) | |
1578 | * could modify max_id to match the current max, | |
1579 | * not the absolute max. | |
1580 | * | |
1581 | * XXX add a shost id iterator, so for example, | |
1582 | * the FC ID can be the same as a target id | |
1583 | * without a huge overhead of sparse id's. | |
1584 | */ | |
1585 | if (shost->reverse_ordering) | |
1586 | /* | |
1587 | * Scan from high to low id. | |
1588 | */ | |
1589 | order_id = shost->max_id - id - 1; | |
1590 | else | |
1591 | order_id = id; | |
e517d313 AS |
1592 | __scsi_scan_target(&shost->shost_gendev, channel, |
1593 | order_id, lun, rescan); | |
1da177e4 LT |
1594 | } |
1595 | else | |
e517d313 AS |
1596 | __scsi_scan_target(&shost->shost_gendev, channel, |
1597 | id, lun, rescan); | |
1da177e4 LT |
1598 | } |
1599 | ||
1600 | int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel, | |
1601 | unsigned int id, unsigned int lun, int rescan) | |
1602 | { | |
3bf743e7 JG |
1603 | SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost, |
1604 | "%s: <%u:%u:%u>\n", | |
1605 | __FUNCTION__, channel, id, lun)); | |
1da177e4 | 1606 | |
3e082a91 MW |
1607 | if (!shost->async_scan) |
1608 | scsi_complete_async_scans(); | |
1609 | ||
1da177e4 | 1610 | if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) || |
091686d3 | 1611 | ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) || |
1da177e4 LT |
1612 | ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun))) |
1613 | return -EINVAL; | |
1614 | ||
0b950672 | 1615 | mutex_lock(&shost->scan_mutex); |
82f29467 MA |
1616 | if (scsi_host_scan_allowed(shost)) { |
1617 | if (channel == SCAN_WILD_CARD) | |
1618 | for (channel = 0; channel <= shost->max_channel; | |
1619 | channel++) | |
1620 | scsi_scan_channel(shost, channel, id, lun, | |
1621 | rescan); | |
1622 | else | |
1da177e4 | 1623 | scsi_scan_channel(shost, channel, id, lun, rescan); |
82f29467 | 1624 | } |
0b950672 | 1625 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
1626 | |
1627 | return 0; | |
1628 | } | |
1629 | ||
3e082a91 MW |
1630 | static void scsi_sysfs_add_devices(struct Scsi_Host *shost) |
1631 | { | |
1632 | struct scsi_device *sdev; | |
1633 | shost_for_each_device(sdev, shost) { | |
1634 | if (scsi_sysfs_add_sdev(sdev) != 0) | |
1635 | scsi_destroy_sdev(sdev); | |
1636 | } | |
1637 | } | |
1638 | ||
1639 | /** | |
1640 | * scsi_prep_async_scan - prepare for an async scan | |
1641 | * @shost: the host which will be scanned | |
1642 | * Returns: a cookie to be passed to scsi_finish_async_scan() | |
1643 | * | |
1644 | * Tells the midlayer this host is going to do an asynchronous scan. | |
1645 | * It reserves the host's position in the scanning list and ensures | |
1646 | * that other asynchronous scans started after this one won't affect the | |
1647 | * ordering of the discovered devices. | |
1648 | */ | |
1aa8fab2 | 1649 | static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost) |
3e082a91 MW |
1650 | { |
1651 | struct async_scan_data *data; | |
1652 | ||
1653 | if (strncmp(scsi_scan_type, "sync", 4) == 0) | |
1654 | return NULL; | |
1655 | ||
1656 | if (shost->async_scan) { | |
1657 | printk("%s called twice for host %d", __FUNCTION__, | |
1658 | shost->host_no); | |
1659 | dump_stack(); | |
1660 | return NULL; | |
1661 | } | |
1662 | ||
1663 | data = kmalloc(sizeof(*data), GFP_KERNEL); | |
1664 | if (!data) | |
1665 | goto err; | |
1666 | data->shost = scsi_host_get(shost); | |
1667 | if (!data->shost) | |
1668 | goto err; | |
1669 | init_completion(&data->prev_finished); | |
1670 | ||
1671 | spin_lock(&async_scan_lock); | |
1672 | shost->async_scan = 1; | |
1673 | if (list_empty(&scanning_hosts)) | |
1674 | complete(&data->prev_finished); | |
1675 | list_add_tail(&data->list, &scanning_hosts); | |
1676 | spin_unlock(&async_scan_lock); | |
1677 | ||
1678 | return data; | |
1679 | ||
1680 | err: | |
1681 | kfree(data); | |
1682 | return NULL; | |
1683 | } | |
1684 | ||
1685 | /** | |
1686 | * scsi_finish_async_scan - asynchronous scan has finished | |
1687 | * @data: cookie returned from earlier call to scsi_prep_async_scan() | |
1688 | * | |
1689 | * All the devices currently attached to this host have been found. | |
1690 | * This function announces all the devices it has found to the rest | |
1691 | * of the system. | |
1692 | */ | |
1aa8fab2 | 1693 | static void scsi_finish_async_scan(struct async_scan_data *data) |
3e082a91 MW |
1694 | { |
1695 | struct Scsi_Host *shost; | |
1696 | ||
1697 | if (!data) | |
1698 | return; | |
1699 | ||
1700 | shost = data->shost; | |
1701 | if (!shost->async_scan) { | |
1702 | printk("%s called twice for host %d", __FUNCTION__, | |
1703 | shost->host_no); | |
1704 | dump_stack(); | |
1705 | return; | |
1706 | } | |
1707 | ||
1708 | wait_for_completion(&data->prev_finished); | |
1709 | ||
1710 | scsi_sysfs_add_devices(shost); | |
1711 | ||
1712 | spin_lock(&async_scan_lock); | |
1713 | shost->async_scan = 0; | |
1714 | list_del(&data->list); | |
1715 | if (!list_empty(&scanning_hosts)) { | |
1716 | struct async_scan_data *next = list_entry(scanning_hosts.next, | |
1717 | struct async_scan_data, list); | |
1718 | complete(&next->prev_finished); | |
1719 | } | |
1720 | spin_unlock(&async_scan_lock); | |
1721 | ||
1722 | scsi_host_put(shost); | |
1723 | kfree(data); | |
1724 | } | |
1725 | ||
1aa8fab2 | 1726 | static void do_scsi_scan_host(struct Scsi_Host *shost) |
3e082a91 | 1727 | { |
1aa8fab2 MW |
1728 | if (shost->hostt->scan_finished) { |
1729 | unsigned long start = jiffies; | |
1730 | if (shost->hostt->scan_start) | |
1731 | shost->hostt->scan_start(shost); | |
1732 | ||
1733 | while (!shost->hostt->scan_finished(shost, jiffies - start)) | |
1734 | msleep(10); | |
1735 | } else { | |
1736 | scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD, | |
3e082a91 | 1737 | SCAN_WILD_CARD, 0); |
1aa8fab2 MW |
1738 | } |
1739 | } | |
3e082a91 | 1740 | |
1aa8fab2 MW |
1741 | static int do_scan_async(void *_data) |
1742 | { | |
1743 | struct async_scan_data *data = _data; | |
1744 | do_scsi_scan_host(data->shost); | |
3e082a91 MW |
1745 | scsi_finish_async_scan(data); |
1746 | return 0; | |
1747 | } | |
1748 | ||
1da177e4 LT |
1749 | /** |
1750 | * scsi_scan_host - scan the given adapter | |
1751 | * @shost: adapter to scan | |
1752 | **/ | |
1753 | void scsi_scan_host(struct Scsi_Host *shost) | |
1754 | { | |
3e082a91 MW |
1755 | struct async_scan_data *data; |
1756 | ||
1757 | if (strncmp(scsi_scan_type, "none", 4) == 0) | |
1758 | return; | |
1759 | ||
1760 | data = scsi_prep_async_scan(shost); | |
1761 | if (!data) { | |
1aa8fab2 | 1762 | do_scsi_scan_host(shost); |
3e082a91 MW |
1763 | return; |
1764 | } | |
1aa8fab2 | 1765 | |
3e082a91 | 1766 | kthread_run(do_scan_async, data, "scsi_scan_%d", shost->host_no); |
1da177e4 LT |
1767 | } |
1768 | EXPORT_SYMBOL(scsi_scan_host); | |
1769 | ||
1da177e4 LT |
1770 | void scsi_forget_host(struct Scsi_Host *shost) |
1771 | { | |
a64358db | 1772 | struct scsi_device *sdev; |
1da177e4 LT |
1773 | unsigned long flags; |
1774 | ||
a64358db | 1775 | restart: |
1da177e4 | 1776 | spin_lock_irqsave(shost->host_lock, flags); |
a64358db AS |
1777 | list_for_each_entry(sdev, &shost->__devices, siblings) { |
1778 | if (sdev->sdev_state == SDEV_DEL) | |
1779 | continue; | |
1da177e4 | 1780 | spin_unlock_irqrestore(shost->host_lock, flags); |
a64358db AS |
1781 | __scsi_remove_device(sdev); |
1782 | goto restart; | |
1da177e4 LT |
1783 | } |
1784 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1785 | } | |
1786 | ||
1787 | /* | |
1788 | * Function: scsi_get_host_dev() | |
1789 | * | |
f64a181d | 1790 | * Purpose: Create a scsi_device that points to the host adapter itself. |
1da177e4 | 1791 | * |
f64a181d | 1792 | * Arguments: SHpnt - Host that needs a scsi_device |
1da177e4 LT |
1793 | * |
1794 | * Lock status: None assumed. | |
1795 | * | |
f64a181d | 1796 | * Returns: The scsi_device or NULL |
1da177e4 LT |
1797 | * |
1798 | * Notes: | |
f64a181d | 1799 | * Attach a single scsi_device to the Scsi_Host - this should |
1da177e4 LT |
1800 | * be made to look like a "pseudo-device" that points to the |
1801 | * HA itself. | |
1802 | * | |
1803 | * Note - this device is not accessible from any high-level | |
1804 | * drivers (including generics), which is probably not | |
1805 | * optimal. We can add hooks later to attach | |
1806 | */ | |
1807 | struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost) | |
1808 | { | |
e517d313 | 1809 | struct scsi_device *sdev = NULL; |
1da177e4 LT |
1810 | struct scsi_target *starget; |
1811 | ||
0b950672 | 1812 | mutex_lock(&shost->scan_mutex); |
e517d313 AS |
1813 | if (!scsi_host_scan_allowed(shost)) |
1814 | goto out; | |
1da177e4 LT |
1815 | starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id); |
1816 | if (!starget) | |
e517d313 | 1817 | goto out; |
1da177e4 LT |
1818 | |
1819 | sdev = scsi_alloc_sdev(starget, 0, NULL); | |
1820 | if (sdev) { | |
1821 | sdev->sdev_gendev.parent = get_device(&starget->dev); | |
1822 | sdev->borken = 0; | |
884d25cc JB |
1823 | } else |
1824 | scsi_target_reap(starget); | |
1da177e4 | 1825 | put_device(&starget->dev); |
e517d313 | 1826 | out: |
0b950672 | 1827 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
1828 | return sdev; |
1829 | } | |
1830 | EXPORT_SYMBOL(scsi_get_host_dev); | |
1831 | ||
1832 | /* | |
1833 | * Function: scsi_free_host_dev() | |
1834 | * | |
1835 | * Purpose: Free a scsi_device that points to the host adapter itself. | |
1836 | * | |
f64a181d | 1837 | * Arguments: SHpnt - Host that needs a scsi_device |
1da177e4 LT |
1838 | * |
1839 | * Lock status: None assumed. | |
1840 | * | |
1841 | * Returns: Nothing | |
1842 | * | |
1843 | * Notes: | |
1844 | */ | |
1845 | void scsi_free_host_dev(struct scsi_device *sdev) | |
1846 | { | |
1847 | BUG_ON(sdev->id != sdev->host->this_id); | |
1848 | ||
6f3a2024 | 1849 | scsi_destroy_sdev(sdev); |
1da177e4 LT |
1850 | } |
1851 | EXPORT_SYMBOL(scsi_free_host_dev); | |
1852 |