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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 | |
12 | * device attached, a scsi_device is allocated and setup for it. | |
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 | |
20 | * scsi_device for it. | |
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 | ||
28 | #include <linux/module.h> | |
29 | #include <linux/moduleparam.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/blkdev.h> | |
32 | #include <asm/semaphore.h> | |
33 | ||
34 | #include <scsi/scsi.h> | |
35 | #include <scsi/scsi_cmnd.h> | |
36 | #include <scsi/scsi_device.h> | |
37 | #include <scsi/scsi_driver.h> | |
38 | #include <scsi/scsi_devinfo.h> | |
39 | #include <scsi/scsi_host.h> | |
40 | #include <scsi/scsi_transport.h> | |
41 | #include <scsi/scsi_eh.h> | |
42 | ||
43 | #include "scsi_priv.h" | |
44 | #include "scsi_logging.h" | |
45 | ||
46 | #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \ | |
47 | " SCSI scanning, some SCSI devices might not be configured\n" | |
48 | ||
49 | /* | |
50 | * Default timeout | |
51 | */ | |
52 | #define SCSI_TIMEOUT (2*HZ) | |
53 | ||
54 | /* | |
55 | * Prefix values for the SCSI id's (stored in driverfs name field) | |
56 | */ | |
57 | #define SCSI_UID_SER_NUM 'S' | |
58 | #define SCSI_UID_UNKNOWN 'Z' | |
59 | ||
60 | /* | |
61 | * Return values of some of the scanning functions. | |
62 | * | |
63 | * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this | |
64 | * includes allocation or general failures preventing IO from being sent. | |
65 | * | |
66 | * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available | |
67 | * on the given LUN. | |
68 | * | |
69 | * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a | |
70 | * given LUN. | |
71 | */ | |
72 | #define SCSI_SCAN_NO_RESPONSE 0 | |
73 | #define SCSI_SCAN_TARGET_PRESENT 1 | |
74 | #define SCSI_SCAN_LUN_PRESENT 2 | |
75 | ||
76 | static const char *scsi_null_device_strs = "nullnullnullnull"; | |
77 | ||
78 | #define MAX_SCSI_LUNS 512 | |
79 | ||
80 | #ifdef CONFIG_SCSI_MULTI_LUN | |
81 | static unsigned int max_scsi_luns = MAX_SCSI_LUNS; | |
82 | #else | |
83 | static unsigned int max_scsi_luns = 1; | |
84 | #endif | |
85 | ||
86 | module_param_named(max_luns, max_scsi_luns, int, S_IRUGO|S_IWUSR); | |
87 | MODULE_PARM_DESC(max_luns, | |
88 | "last scsi LUN (should be between 1 and 2^32-1)"); | |
89 | ||
90 | /* | |
91 | * max_scsi_report_luns: the maximum number of LUNS that will be | |
92 | * returned from the REPORT LUNS command. 8 times this value must | |
93 | * be allocated. In theory this could be up to an 8 byte value, but | |
94 | * in practice, the maximum number of LUNs suppored by any device | |
95 | * is about 16k. | |
96 | */ | |
97 | static unsigned int max_scsi_report_luns = 511; | |
98 | ||
99 | module_param_named(max_report_luns, max_scsi_report_luns, int, S_IRUGO|S_IWUSR); | |
100 | MODULE_PARM_DESC(max_report_luns, | |
101 | "REPORT LUNS maximum number of LUNS received (should be" | |
102 | " between 1 and 16384)"); | |
103 | ||
104 | static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+3; | |
105 | ||
106 | module_param_named(inq_timeout, scsi_inq_timeout, int, S_IRUGO|S_IWUSR); | |
107 | MODULE_PARM_DESC(inq_timeout, | |
108 | "Timeout (in seconds) waiting for devices to answer INQUIRY." | |
109 | " Default is 5. Some non-compliant devices need more."); | |
110 | ||
111 | /** | |
112 | * scsi_unlock_floptical - unlock device via a special MODE SENSE command | |
113 | * @sdev: scsi device to send command to | |
114 | * @result: area to store the result of the MODE SENSE | |
115 | * | |
116 | * Description: | |
117 | * Send a vendor specific MODE SENSE (not a MODE SELECT) command. | |
118 | * Called for BLIST_KEY devices. | |
119 | **/ | |
120 | static void scsi_unlock_floptical(struct scsi_device *sdev, | |
121 | unsigned char *result) | |
122 | { | |
123 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
124 | ||
125 | printk(KERN_NOTICE "scsi: unlocking floptical drive\n"); | |
126 | scsi_cmd[0] = MODE_SENSE; | |
127 | scsi_cmd[1] = 0; | |
128 | scsi_cmd[2] = 0x2e; | |
129 | scsi_cmd[3] = 0; | |
130 | scsi_cmd[4] = 0x2a; /* size */ | |
131 | scsi_cmd[5] = 0; | |
132 | scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL, | |
133 | SCSI_TIMEOUT, 3); | |
134 | } | |
135 | ||
136 | /** | |
137 | * scsi_alloc_sdev - allocate and setup a scsi_Device | |
138 | * | |
139 | * Description: | |
140 | * Allocate, initialize for io, and return a pointer to a scsi_Device. | |
141 | * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and | |
142 | * adds scsi_Device to the appropriate list. | |
143 | * | |
144 | * Return value: | |
145 | * scsi_Device pointer, or NULL on failure. | |
146 | **/ | |
147 | static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, | |
148 | unsigned int lun, void *hostdata) | |
149 | { | |
150 | struct scsi_device *sdev; | |
151 | int display_failure_msg = 1, ret; | |
152 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
153 | ||
154 | sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size, | |
155 | GFP_ATOMIC); | |
156 | if (!sdev) | |
157 | goto out; | |
158 | ||
159 | sdev->vendor = scsi_null_device_strs; | |
160 | sdev->model = scsi_null_device_strs; | |
161 | sdev->rev = scsi_null_device_strs; | |
162 | sdev->host = shost; | |
163 | sdev->id = starget->id; | |
164 | sdev->lun = lun; | |
165 | sdev->channel = starget->channel; | |
166 | sdev->sdev_state = SDEV_CREATED; | |
167 | INIT_LIST_HEAD(&sdev->siblings); | |
168 | INIT_LIST_HEAD(&sdev->same_target_siblings); | |
169 | INIT_LIST_HEAD(&sdev->cmd_list); | |
170 | INIT_LIST_HEAD(&sdev->starved_entry); | |
171 | spin_lock_init(&sdev->list_lock); | |
172 | ||
173 | sdev->sdev_gendev.parent = get_device(&starget->dev); | |
174 | sdev->sdev_target = starget; | |
175 | ||
176 | /* usually NULL and set by ->slave_alloc instead */ | |
177 | sdev->hostdata = hostdata; | |
178 | ||
179 | /* if the device needs this changing, it may do so in the | |
180 | * slave_configure function */ | |
181 | sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED; | |
182 | ||
183 | /* | |
184 | * Some low level driver could use device->type | |
185 | */ | |
186 | sdev->type = -1; | |
187 | ||
188 | /* | |
189 | * Assume that the device will have handshaking problems, | |
190 | * and then fix this field later if it turns out it | |
191 | * doesn't | |
192 | */ | |
193 | sdev->borken = 1; | |
194 | ||
195 | sdev->request_queue = scsi_alloc_queue(sdev); | |
196 | if (!sdev->request_queue) { | |
197 | /* release fn is set up in scsi_sysfs_device_initialise, so | |
198 | * have to free and put manually here */ | |
199 | put_device(&starget->dev); | |
200 | kfree(sdev); | |
201 | goto out; | |
202 | } | |
203 | ||
204 | sdev->request_queue->queuedata = sdev; | |
205 | scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun); | |
206 | ||
207 | scsi_sysfs_device_initialize(sdev); | |
208 | ||
209 | if (shost->hostt->slave_alloc) { | |
210 | ret = shost->hostt->slave_alloc(sdev); | |
211 | if (ret) { | |
212 | /* | |
213 | * if LLDD reports slave not present, don't clutter | |
214 | * console with alloc failure messages | |
215 | */ | |
216 | if (ret == -ENXIO) | |
217 | display_failure_msg = 0; | |
218 | goto out_device_destroy; | |
219 | } | |
220 | } | |
221 | ||
222 | return sdev; | |
223 | ||
224 | out_device_destroy: | |
225 | transport_destroy_device(&sdev->sdev_gendev); | |
226 | put_device(&sdev->sdev_gendev); | |
227 | out: | |
228 | if (display_failure_msg) | |
229 | printk(ALLOC_FAILURE_MSG, __FUNCTION__); | |
230 | return NULL; | |
231 | } | |
232 | ||
233 | static void scsi_target_dev_release(struct device *dev) | |
234 | { | |
235 | struct device *parent = dev->parent; | |
236 | struct scsi_target *starget = to_scsi_target(dev); | |
237 | ||
238 | kfree(starget); | |
239 | put_device(parent); | |
240 | } | |
241 | ||
242 | int scsi_is_target_device(const struct device *dev) | |
243 | { | |
244 | return dev->release == scsi_target_dev_release; | |
245 | } | |
246 | EXPORT_SYMBOL(scsi_is_target_device); | |
247 | ||
248 | static struct scsi_target *__scsi_find_target(struct device *parent, | |
249 | int channel, uint id) | |
250 | { | |
251 | struct scsi_target *starget, *found_starget = NULL; | |
252 | struct Scsi_Host *shost = dev_to_shost(parent); | |
253 | /* | |
254 | * Search for an existing target for this sdev. | |
255 | */ | |
256 | list_for_each_entry(starget, &shost->__targets, siblings) { | |
257 | if (starget->id == id && | |
258 | starget->channel == channel) { | |
259 | found_starget = starget; | |
260 | break; | |
261 | } | |
262 | } | |
263 | if (found_starget) | |
264 | get_device(&found_starget->dev); | |
265 | ||
266 | return found_starget; | |
267 | } | |
268 | ||
269 | /** | |
270 | * scsi_alloc_target - allocate a new or find an existing target | |
271 | * @parent: parent of the target (need not be a scsi host) | |
272 | * @channel: target channel number (zero if no channels) | |
273 | * @id: target id number | |
274 | * | |
275 | * Return an existing target if one exists, provided it hasn't already | |
276 | * gone into STARGET_DEL state, otherwise allocate a new target. | |
277 | * | |
278 | * The target is returned with an incremented reference, so the caller | |
279 | * is responsible for both reaping and doing a last put | |
280 | */ | |
281 | static struct scsi_target *scsi_alloc_target(struct device *parent, | |
282 | int channel, uint id) | |
283 | { | |
284 | struct Scsi_Host *shost = dev_to_shost(parent); | |
285 | struct device *dev = NULL; | |
286 | unsigned long flags; | |
287 | const int size = sizeof(struct scsi_target) | |
288 | + shost->transportt->target_size; | |
289 | struct scsi_target *starget; | |
290 | struct scsi_target *found_target; | |
291 | int error; | |
292 | ||
293 | starget = kzalloc(size, GFP_KERNEL); | |
294 | if (!starget) { | |
295 | printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__); | |
296 | return NULL; | |
297 | } | |
298 | dev = &starget->dev; | |
299 | device_initialize(dev); | |
300 | starget->reap_ref = 1; | |
301 | dev->parent = get_device(parent); | |
302 | dev->release = scsi_target_dev_release; | |
303 | sprintf(dev->bus_id, "target%d:%d:%d", | |
304 | shost->host_no, channel, id); | |
305 | starget->id = id; | |
306 | starget->channel = channel; | |
307 | INIT_LIST_HEAD(&starget->siblings); | |
308 | INIT_LIST_HEAD(&starget->devices); | |
309 | starget->state = STARGET_RUNNING; | |
310 | retry: | |
311 | spin_lock_irqsave(shost->host_lock, flags); | |
312 | ||
313 | found_target = __scsi_find_target(parent, channel, id); | |
314 | if (found_target) | |
315 | goto found; | |
316 | ||
317 | list_add_tail(&starget->siblings, &shost->__targets); | |
318 | spin_unlock_irqrestore(shost->host_lock, flags); | |
319 | /* allocate and add */ | |
320 | transport_setup_device(dev); | |
321 | error = device_add(dev); | |
322 | if (error) { | |
323 | dev_err(dev, "target device_add failed, error %d\n", error); | |
324 | spin_lock_irqsave(shost->host_lock, flags); | |
325 | list_del_init(&starget->siblings); | |
326 | spin_unlock_irqrestore(shost->host_lock, flags); | |
327 | transport_destroy_device(dev); | |
328 | put_device(parent); | |
329 | kfree(starget); | |
330 | return NULL; | |
331 | } | |
332 | transport_add_device(dev); | |
333 | if (shost->hostt->target_alloc) { | |
334 | error = shost->hostt->target_alloc(starget); | |
335 | ||
336 | if(error) { | |
337 | dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error); | |
338 | /* don't want scsi_target_reap to do the final | |
339 | * put because it will be under the host lock */ | |
340 | get_device(dev); | |
341 | scsi_target_reap(starget); | |
342 | put_device(dev); | |
343 | return NULL; | |
344 | } | |
345 | } | |
346 | get_device(dev); | |
347 | ||
348 | return starget; | |
349 | ||
350 | found: | |
351 | found_target->reap_ref++; | |
352 | spin_unlock_irqrestore(shost->host_lock, flags); | |
353 | if (found_target->state != STARGET_DEL) { | |
354 | put_device(parent); | |
355 | kfree(starget); | |
356 | return found_target; | |
357 | } | |
358 | /* Unfortunately, we found a dying target; need to | |
359 | * wait until it's dead before we can get a new one */ | |
360 | put_device(&found_target->dev); | |
361 | flush_scheduled_work(); | |
362 | goto retry; | |
363 | } | |
364 | ||
365 | static void scsi_target_reap_usercontext(void *data) | |
366 | { | |
367 | struct scsi_target *starget = data; | |
368 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
369 | unsigned long flags; | |
370 | ||
371 | transport_remove_device(&starget->dev); | |
372 | device_del(&starget->dev); | |
373 | transport_destroy_device(&starget->dev); | |
374 | spin_lock_irqsave(shost->host_lock, flags); | |
375 | if (shost->hostt->target_destroy) | |
376 | shost->hostt->target_destroy(starget); | |
377 | list_del_init(&starget->siblings); | |
378 | spin_unlock_irqrestore(shost->host_lock, flags); | |
379 | put_device(&starget->dev); | |
380 | } | |
381 | ||
382 | /** | |
383 | * scsi_target_reap - check to see if target is in use and destroy if not | |
384 | * | |
385 | * @starget: target to be checked | |
386 | * | |
387 | * This is used after removing a LUN or doing a last put of the target | |
388 | * it checks atomically that nothing is using the target and removes | |
389 | * it if so. | |
390 | */ | |
391 | void scsi_target_reap(struct scsi_target *starget) | |
392 | { | |
393 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
394 | unsigned long flags; | |
395 | ||
396 | spin_lock_irqsave(shost->host_lock, flags); | |
397 | ||
398 | if (--starget->reap_ref == 0 && list_empty(&starget->devices)) { | |
399 | BUG_ON(starget->state == STARGET_DEL); | |
400 | starget->state = STARGET_DEL; | |
401 | spin_unlock_irqrestore(shost->host_lock, flags); | |
402 | execute_in_process_context(scsi_target_reap_usercontext, | |
403 | starget, &starget->ew); | |
404 | return; | |
405 | ||
406 | } | |
407 | spin_unlock_irqrestore(shost->host_lock, flags); | |
408 | ||
409 | return; | |
410 | } | |
411 | ||
412 | /** | |
413 | * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string | |
414 | * @s: INQUIRY result string to sanitize | |
415 | * @len: length of the string | |
416 | * | |
417 | * Description: | |
418 | * The SCSI spec says that INQUIRY vendor, product, and revision | |
419 | * strings must consist entirely of graphic ASCII characters, | |
420 | * padded on the right with spaces. Since not all devices obey | |
421 | * this rule, we will replace non-graphic or non-ASCII characters | |
422 | * with spaces. Exception: a NUL character is interpreted as a | |
423 | * string terminator, so all the following characters are set to | |
424 | * spaces. | |
425 | **/ | |
426 | static void sanitize_inquiry_string(unsigned char *s, int len) | |
427 | { | |
428 | int terminated = 0; | |
429 | ||
430 | for (; len > 0; (--len, ++s)) { | |
431 | if (*s == 0) | |
432 | terminated = 1; | |
433 | if (terminated || *s < 0x20 || *s > 0x7e) | |
434 | *s = ' '; | |
435 | } | |
436 | } | |
437 | ||
438 | /** | |
439 | * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY | |
440 | * @sdev: scsi_device to probe | |
441 | * @inq_result: area to store the INQUIRY result | |
442 | * @result_len: len of inq_result | |
443 | * @bflags: store any bflags found here | |
444 | * | |
445 | * Description: | |
446 | * Probe the lun associated with @req using a standard SCSI INQUIRY; | |
447 | * | |
448 | * If the INQUIRY is successful, zero is returned and the | |
449 | * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length | |
450 | * are copied to the scsi_device any flags value is stored in *@bflags. | |
451 | **/ | |
452 | static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result, | |
453 | int result_len, int *bflags) | |
454 | { | |
455 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
456 | int first_inquiry_len, try_inquiry_len, next_inquiry_len; | |
457 | int response_len = 0; | |
458 | int pass, count, result; | |
459 | struct scsi_sense_hdr sshdr; | |
460 | ||
461 | *bflags = 0; | |
462 | ||
463 | /* Perform up to 3 passes. The first pass uses a conservative | |
464 | * transfer length of 36 unless sdev->inquiry_len specifies a | |
465 | * different value. */ | |
466 | first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36; | |
467 | try_inquiry_len = first_inquiry_len; | |
468 | pass = 1; | |
469 | ||
470 | next_pass: | |
471 | SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, | |
472 | "scsi scan: INQUIRY pass %d length %d\n", | |
473 | pass, try_inquiry_len)); | |
474 | ||
475 | /* Each pass gets up to three chances to ignore Unit Attention */ | |
476 | for (count = 0; count < 3; ++count) { | |
477 | memset(scsi_cmd, 0, 6); | |
478 | scsi_cmd[0] = INQUIRY; | |
479 | scsi_cmd[4] = (unsigned char) try_inquiry_len; | |
480 | ||
481 | memset(inq_result, 0, try_inquiry_len); | |
482 | ||
483 | result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, | |
484 | inq_result, try_inquiry_len, &sshdr, | |
485 | HZ / 2 + HZ * scsi_inq_timeout, 3); | |
486 | ||
487 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s " | |
488 | "with code 0x%x\n", | |
489 | result ? "failed" : "successful", result)); | |
490 | ||
491 | if (result) { | |
492 | /* | |
493 | * not-ready to ready transition [asc/ascq=0x28/0x0] | |
494 | * or power-on, reset [asc/ascq=0x29/0x0], continue. | |
495 | * INQUIRY should not yield UNIT_ATTENTION | |
496 | * but many buggy devices do so anyway. | |
497 | */ | |
498 | if ((driver_byte(result) & DRIVER_SENSE) && | |
499 | scsi_sense_valid(&sshdr)) { | |
500 | if ((sshdr.sense_key == UNIT_ATTENTION) && | |
501 | ((sshdr.asc == 0x28) || | |
502 | (sshdr.asc == 0x29)) && | |
503 | (sshdr.ascq == 0)) | |
504 | continue; | |
505 | } | |
506 | } | |
507 | break; | |
508 | } | |
509 | ||
510 | if (result == 0) { | |
511 | sanitize_inquiry_string(&inq_result[8], 8); | |
512 | sanitize_inquiry_string(&inq_result[16], 16); | |
513 | sanitize_inquiry_string(&inq_result[32], 4); | |
514 | ||
515 | response_len = inq_result[4] + 5; | |
516 | if (response_len > 255) | |
517 | response_len = first_inquiry_len; /* sanity */ | |
518 | ||
519 | /* | |
520 | * Get any flags for this device. | |
521 | * | |
522 | * XXX add a bflags to scsi_device, and replace the | |
523 | * corresponding bit fields in scsi_device, so bflags | |
524 | * need not be passed as an argument. | |
525 | */ | |
526 | *bflags = scsi_get_device_flags(sdev, &inq_result[8], | |
527 | &inq_result[16]); | |
528 | ||
529 | /* When the first pass succeeds we gain information about | |
530 | * what larger transfer lengths might work. */ | |
531 | if (pass == 1) { | |
532 | if (BLIST_INQUIRY_36 & *bflags) | |
533 | next_inquiry_len = 36; | |
534 | else if (BLIST_INQUIRY_58 & *bflags) | |
535 | next_inquiry_len = 58; | |
536 | else if (sdev->inquiry_len) | |
537 | next_inquiry_len = sdev->inquiry_len; | |
538 | else | |
539 | next_inquiry_len = response_len; | |
540 | ||
541 | /* If more data is available perform the second pass */ | |
542 | if (next_inquiry_len > try_inquiry_len) { | |
543 | try_inquiry_len = next_inquiry_len; | |
544 | pass = 2; | |
545 | goto next_pass; | |
546 | } | |
547 | } | |
548 | ||
549 | } else if (pass == 2) { | |
550 | printk(KERN_INFO "scsi scan: %d byte inquiry failed. " | |
551 | "Consider BLIST_INQUIRY_36 for this device\n", | |
552 | try_inquiry_len); | |
553 | ||
554 | /* If this pass failed, the third pass goes back and transfers | |
555 | * the same amount as we successfully got in the first pass. */ | |
556 | try_inquiry_len = first_inquiry_len; | |
557 | pass = 3; | |
558 | goto next_pass; | |
559 | } | |
560 | ||
561 | /* If the last transfer attempt got an error, assume the | |
562 | * peripheral doesn't exist or is dead. */ | |
563 | if (result) | |
564 | return -EIO; | |
565 | ||
566 | /* Don't report any more data than the device says is valid */ | |
567 | sdev->inquiry_len = min(try_inquiry_len, response_len); | |
568 | ||
569 | /* | |
570 | * XXX Abort if the response length is less than 36? If less than | |
571 | * 32, the lookup of the device flags (above) could be invalid, | |
572 | * and it would be possible to take an incorrect action - we do | |
573 | * not want to hang because of a short INQUIRY. On the flip side, | |
574 | * if the device is spun down or becoming ready (and so it gives a | |
575 | * short INQUIRY), an abort here prevents any further use of the | |
576 | * device, including spin up. | |
577 | * | |
578 | * Related to the above issue: | |
579 | * | |
580 | * XXX Devices (disk or all?) should be sent a TEST UNIT READY, | |
581 | * and if not ready, sent a START_STOP to start (maybe spin up) and | |
582 | * then send the INQUIRY again, since the INQUIRY can change after | |
583 | * a device is initialized. | |
584 | * | |
585 | * Ideally, start a device if explicitly asked to do so. This | |
586 | * assumes that a device is spun up on power on, spun down on | |
587 | * request, and then spun up on request. | |
588 | */ | |
589 | ||
590 | /* | |
591 | * The scanning code needs to know the scsi_level, even if no | |
592 | * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so | |
593 | * non-zero LUNs can be scanned. | |
594 | */ | |
595 | sdev->scsi_level = inq_result[2] & 0x07; | |
596 | if (sdev->scsi_level >= 2 || | |
597 | (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1)) | |
598 | sdev->scsi_level++; | |
599 | sdev->sdev_target->scsi_level = sdev->scsi_level; | |
600 | ||
601 | return 0; | |
602 | } | |
603 | ||
604 | /** | |
605 | * scsi_add_lun - allocate and fully initialze a scsi_device | |
606 | * @sdevscan: holds information to be stored in the new scsi_device | |
607 | * @sdevnew: store the address of the newly allocated scsi_device | |
608 | * @inq_result: holds the result of a previous INQUIRY to the LUN | |
609 | * @bflags: black/white list flag | |
610 | * | |
611 | * Description: | |
612 | * Allocate and initialize a scsi_device matching sdevscan. Optionally | |
613 | * set fields based on values in *@bflags. If @sdevnew is not | |
614 | * NULL, store the address of the new scsi_device in *@sdevnew (needed | |
615 | * when scanning a particular LUN). | |
616 | * | |
617 | * Return: | |
618 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device | |
619 | * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized | |
620 | **/ | |
621 | static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, | |
622 | int *bflags) | |
623 | { | |
624 | /* | |
625 | * XXX do not save the inquiry, since it can change underneath us, | |
626 | * save just vendor/model/rev. | |
627 | * | |
628 | * Rather than save it and have an ioctl that retrieves the saved | |
629 | * value, have an ioctl that executes the same INQUIRY code used | |
630 | * in scsi_probe_lun, let user level programs doing INQUIRY | |
631 | * scanning run at their own risk, or supply a user level program | |
632 | * that can correctly scan. | |
633 | */ | |
634 | sdev->inquiry = kmalloc(sdev->inquiry_len, GFP_ATOMIC); | |
635 | if (sdev->inquiry == NULL) { | |
636 | return SCSI_SCAN_NO_RESPONSE; | |
637 | } | |
638 | ||
639 | memcpy(sdev->inquiry, inq_result, sdev->inquiry_len); | |
640 | sdev->vendor = (char *) (sdev->inquiry + 8); | |
641 | sdev->model = (char *) (sdev->inquiry + 16); | |
642 | sdev->rev = (char *) (sdev->inquiry + 32); | |
643 | ||
644 | if (*bflags & BLIST_ISROM) { | |
645 | /* | |
646 | * It would be better to modify sdev->type, and set | |
647 | * sdev->removable; this can now be done since | |
648 | * print_inquiry has gone away. | |
649 | */ | |
650 | inq_result[0] = TYPE_ROM; | |
651 | inq_result[1] |= 0x80; /* removable */ | |
652 | } else if (*bflags & BLIST_NO_ULD_ATTACH) | |
653 | sdev->no_uld_attach = 1; | |
654 | ||
655 | switch (sdev->type = (inq_result[0] & 0x1f)) { | |
656 | case TYPE_TAPE: | |
657 | case TYPE_DISK: | |
658 | case TYPE_PRINTER: | |
659 | case TYPE_MOD: | |
660 | case TYPE_PROCESSOR: | |
661 | case TYPE_SCANNER: | |
662 | case TYPE_MEDIUM_CHANGER: | |
663 | case TYPE_ENCLOSURE: | |
664 | case TYPE_COMM: | |
665 | case TYPE_RAID: | |
666 | case TYPE_RBC: | |
667 | sdev->writeable = 1; | |
668 | break; | |
669 | case TYPE_WORM: | |
670 | case TYPE_ROM: | |
671 | sdev->writeable = 0; | |
672 | break; | |
673 | default: | |
674 | printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type); | |
675 | } | |
676 | ||
677 | /* | |
678 | * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI | |
679 | * spec says: The device server is capable of supporting the | |
680 | * specified peripheral device type on this logical unit. However, | |
681 | * the physical device is not currently connected to this logical | |
682 | * unit. | |
683 | * | |
684 | * The above is vague, as it implies that we could treat 001 and | |
685 | * 011 the same. Stay compatible with previous code, and create a | |
686 | * scsi_device for a PQ of 1 | |
687 | * | |
688 | * Don't set the device offline here; rather let the upper | |
689 | * level drivers eval the PQ to decide whether they should | |
690 | * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check. | |
691 | */ | |
692 | ||
693 | sdev->inq_periph_qual = (inq_result[0] >> 5) & 7; | |
694 | sdev->removable = (0x80 & inq_result[1]) >> 7; | |
695 | sdev->lockable = sdev->removable; | |
696 | sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2); | |
697 | ||
698 | if (sdev->scsi_level >= SCSI_3 || (sdev->inquiry_len > 56 && | |
699 | inq_result[56] & 0x04)) | |
700 | sdev->ppr = 1; | |
701 | if (inq_result[7] & 0x60) | |
702 | sdev->wdtr = 1; | |
703 | if (inq_result[7] & 0x10) | |
704 | sdev->sdtr = 1; | |
705 | ||
706 | sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d " | |
707 | "ANSI: %d%s\n", scsi_device_type(sdev->type), | |
708 | sdev->vendor, sdev->model, sdev->rev, | |
709 | sdev->inq_periph_qual, inq_result[2] & 0x07, | |
710 | (inq_result[3] & 0x0f) == 1 ? " CCS" : ""); | |
711 | ||
712 | /* | |
713 | * End sysfs code. | |
714 | */ | |
715 | ||
716 | if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) && | |
717 | !(*bflags & BLIST_NOTQ)) | |
718 | sdev->tagged_supported = 1; | |
719 | /* | |
720 | * Some devices (Texel CD ROM drives) have handshaking problems | |
721 | * when used with the Seagate controllers. borken is initialized | |
722 | * to 1, and then set it to 0 here. | |
723 | */ | |
724 | if ((*bflags & BLIST_BORKEN) == 0) | |
725 | sdev->borken = 0; | |
726 | ||
727 | /* | |
728 | * Apparently some really broken devices (contrary to the SCSI | |
729 | * standards) need to be selected without asserting ATN | |
730 | */ | |
731 | if (*bflags & BLIST_SELECT_NO_ATN) | |
732 | sdev->select_no_atn = 1; | |
733 | ||
734 | /* | |
735 | * Maximum 512 sector transfer length | |
736 | * broken RA4x00 Compaq Disk Array | |
737 | */ | |
738 | if (*bflags & BLIST_MAX_512) | |
739 | blk_queue_max_sectors(sdev->request_queue, 512); | |
740 | ||
741 | /* | |
742 | * Some devices may not want to have a start command automatically | |
743 | * issued when a device is added. | |
744 | */ | |
745 | if (*bflags & BLIST_NOSTARTONADD) | |
746 | sdev->no_start_on_add = 1; | |
747 | ||
748 | if (*bflags & BLIST_SINGLELUN) | |
749 | sdev->single_lun = 1; | |
750 | ||
751 | ||
752 | sdev->use_10_for_rw = 1; | |
753 | ||
754 | if (*bflags & BLIST_MS_SKIP_PAGE_08) | |
755 | sdev->skip_ms_page_8 = 1; | |
756 | ||
757 | if (*bflags & BLIST_MS_SKIP_PAGE_3F) | |
758 | sdev->skip_ms_page_3f = 1; | |
759 | ||
760 | if (*bflags & BLIST_USE_10_BYTE_MS) | |
761 | sdev->use_10_for_ms = 1; | |
762 | ||
763 | /* set the device running here so that slave configure | |
764 | * may do I/O */ | |
765 | scsi_device_set_state(sdev, SDEV_RUNNING); | |
766 | ||
767 | if (*bflags & BLIST_MS_192_BYTES_FOR_3F) | |
768 | sdev->use_192_bytes_for_3f = 1; | |
769 | ||
770 | if (*bflags & BLIST_NOT_LOCKABLE) | |
771 | sdev->lockable = 0; | |
772 | ||
773 | if (*bflags & BLIST_RETRY_HWERROR) | |
774 | sdev->retry_hwerror = 1; | |
775 | ||
776 | transport_configure_device(&sdev->sdev_gendev); | |
777 | ||
778 | if (sdev->host->hostt->slave_configure) { | |
779 | int ret = sdev->host->hostt->slave_configure(sdev); | |
780 | if (ret) { | |
781 | /* | |
782 | * if LLDD reports slave not present, don't clutter | |
783 | * console with alloc failure messages | |
784 | */ | |
785 | if (ret != -ENXIO) { | |
786 | sdev_printk(KERN_ERR, sdev, | |
787 | "failed to configure device\n"); | |
788 | } | |
789 | return SCSI_SCAN_NO_RESPONSE; | |
790 | } | |
791 | } | |
792 | ||
793 | /* | |
794 | * Ok, the device is now all set up, we can | |
795 | * register it and tell the rest of the kernel | |
796 | * about it. | |
797 | */ | |
798 | if (scsi_sysfs_add_sdev(sdev) != 0) | |
799 | return SCSI_SCAN_NO_RESPONSE; | |
800 | ||
801 | return SCSI_SCAN_LUN_PRESENT; | |
802 | } | |
803 | ||
804 | static inline void scsi_destroy_sdev(struct scsi_device *sdev) | |
805 | { | |
806 | scsi_device_set_state(sdev, SDEV_DEL); | |
807 | if (sdev->host->hostt->slave_destroy) | |
808 | sdev->host->hostt->slave_destroy(sdev); | |
809 | transport_destroy_device(&sdev->sdev_gendev); | |
810 | put_device(&sdev->sdev_gendev); | |
811 | } | |
812 | ||
813 | #ifdef CONFIG_SCSI_LOGGING | |
814 | /** | |
815 | * scsi_inq_str - print INQUIRY data from min to max index, | |
816 | * strip trailing whitespace | |
817 | * @buf: Output buffer with at least end-first+1 bytes of space | |
818 | * @inq: Inquiry buffer (input) | |
819 | * @first: Offset of string into inq | |
820 | * @end: Index after last character in inq | |
821 | */ | |
822 | static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq, | |
823 | unsigned first, unsigned end) | |
824 | { | |
825 | unsigned term = 0, idx; | |
826 | ||
827 | for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) { | |
828 | if (inq[idx+first] > ' ') { | |
829 | buf[idx] = inq[idx+first]; | |
830 | term = idx+1; | |
831 | } else { | |
832 | buf[idx] = ' '; | |
833 | } | |
834 | } | |
835 | buf[term] = 0; | |
836 | return buf; | |
837 | } | |
838 | #endif | |
839 | ||
840 | /** | |
841 | * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it | |
842 | * @starget: pointer to target device structure | |
843 | * @lun: LUN of target device | |
844 | * @sdevscan: probe the LUN corresponding to this scsi_device | |
845 | * @sdevnew: store the value of any new scsi_device allocated | |
846 | * @bflagsp: store bflags here if not NULL | |
847 | * | |
848 | * Description: | |
849 | * Call scsi_probe_lun, if a LUN with an attached device is found, | |
850 | * allocate and set it up by calling scsi_add_lun. | |
851 | * | |
852 | * Return: | |
853 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device | |
854 | * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is | |
855 | * attached at the LUN | |
856 | * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized | |
857 | **/ | |
858 | static int scsi_probe_and_add_lun(struct scsi_target *starget, | |
859 | uint lun, int *bflagsp, | |
860 | struct scsi_device **sdevp, int rescan, | |
861 | void *hostdata) | |
862 | { | |
863 | struct scsi_device *sdev; | |
864 | unsigned char *result; | |
865 | int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256; | |
866 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
867 | ||
868 | /* | |
869 | * The rescan flag is used as an optimization, the first scan of a | |
870 | * host adapter calls into here with rescan == 0. | |
871 | */ | |
872 | sdev = scsi_device_lookup_by_target(starget, lun); | |
873 | if (sdev) { | |
874 | if (rescan || sdev->sdev_state != SDEV_CREATED) { | |
875 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO | |
876 | "scsi scan: device exists on %s\n", | |
877 | sdev->sdev_gendev.bus_id)); | |
878 | if (sdevp) | |
879 | *sdevp = sdev; | |
880 | else | |
881 | scsi_device_put(sdev); | |
882 | ||
883 | if (bflagsp) | |
884 | *bflagsp = scsi_get_device_flags(sdev, | |
885 | sdev->vendor, | |
886 | sdev->model); | |
887 | return SCSI_SCAN_LUN_PRESENT; | |
888 | } | |
889 | scsi_device_put(sdev); | |
890 | } else | |
891 | sdev = scsi_alloc_sdev(starget, lun, hostdata); | |
892 | if (!sdev) | |
893 | goto out; | |
894 | ||
895 | result = kmalloc(result_len, GFP_ATOMIC | | |
896 | ((shost->unchecked_isa_dma) ? __GFP_DMA : 0)); | |
897 | if (!result) | |
898 | goto out_free_sdev; | |
899 | ||
900 | if (scsi_probe_lun(sdev, result, result_len, &bflags)) | |
901 | goto out_free_result; | |
902 | ||
903 | if (bflagsp) | |
904 | *bflagsp = bflags; | |
905 | /* | |
906 | * result contains valid SCSI INQUIRY data. | |
907 | */ | |
908 | if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) { | |
909 | /* | |
910 | * For a Peripheral qualifier 3 (011b), the SCSI | |
911 | * spec says: The device server is not capable of | |
912 | * supporting a physical device on this logical | |
913 | * unit. | |
914 | * | |
915 | * For disks, this implies that there is no | |
916 | * logical disk configured at sdev->lun, but there | |
917 | * is a target id responding. | |
918 | */ | |
919 | SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:" | |
920 | " peripheral qualifier of 3, device not" | |
921 | " added\n")) | |
922 | if (lun == 0) { | |
923 | SCSI_LOG_SCAN_BUS(1, { | |
924 | unsigned char vend[9]; | |
925 | unsigned char mod[17]; | |
926 | ||
927 | sdev_printk(KERN_INFO, sdev, | |
928 | "scsi scan: consider passing scsi_mod." | |
929 | "dev_flags=%s:%s:0x240 or 0x800240\n", | |
930 | scsi_inq_str(vend, result, 8, 16), | |
931 | scsi_inq_str(mod, result, 16, 32)); | |
932 | }); | |
933 | } | |
934 | ||
935 | res = SCSI_SCAN_TARGET_PRESENT; | |
936 | goto out_free_result; | |
937 | } | |
938 | ||
939 | /* | |
940 | * Some targets may set slight variations of PQ and PDT to signal | |
941 | * that no LUN is present, so don't add sdev in these cases. | |
942 | * Two specific examples are: | |
943 | * 1) NetApp targets: return PQ=1, PDT=0x1f | |
944 | * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved" | |
945 | * in the UFI 1.0 spec (we cannot rely on reserved bits). | |
946 | * | |
947 | * References: | |
948 | * 1) SCSI SPC-3, pp. 145-146 | |
949 | * PQ=1: "A peripheral device having the specified peripheral | |
950 | * device type is not connected to this logical unit. However, the | |
951 | * device server is capable of supporting the specified peripheral | |
952 | * device type on this logical unit." | |
953 | * PDT=0x1f: "Unknown or no device type" | |
954 | * 2) USB UFI 1.0, p. 20 | |
955 | * PDT=00h Direct-access device (floppy) | |
956 | * PDT=1Fh none (no FDD connected to the requested logical unit) | |
957 | */ | |
958 | if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) && | |
959 | (result[0] & 0x1f) == 0x1f) { | |
960 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO | |
961 | "scsi scan: peripheral device type" | |
962 | " of 31, no device added\n")); | |
963 | res = SCSI_SCAN_TARGET_PRESENT; | |
964 | goto out_free_result; | |
965 | } | |
966 | ||
967 | res = scsi_add_lun(sdev, result, &bflags); | |
968 | if (res == SCSI_SCAN_LUN_PRESENT) { | |
969 | if (bflags & BLIST_KEY) { | |
970 | sdev->lockable = 0; | |
971 | scsi_unlock_floptical(sdev, result); | |
972 | } | |
973 | } | |
974 | ||
975 | out_free_result: | |
976 | kfree(result); | |
977 | out_free_sdev: | |
978 | if (res == SCSI_SCAN_LUN_PRESENT) { | |
979 | if (sdevp) { | |
980 | if (scsi_device_get(sdev) == 0) { | |
981 | *sdevp = sdev; | |
982 | } else { | |
983 | __scsi_remove_device(sdev); | |
984 | res = SCSI_SCAN_NO_RESPONSE; | |
985 | } | |
986 | } | |
987 | } else | |
988 | scsi_destroy_sdev(sdev); | |
989 | out: | |
990 | return res; | |
991 | } | |
992 | ||
993 | /** | |
994 | * scsi_sequential_lun_scan - sequentially scan a SCSI target | |
995 | * @starget: pointer to target structure to scan | |
996 | * @bflags: black/white list flag for LUN 0 | |
997 | * | |
998 | * Description: | |
999 | * Generally, scan from LUN 1 (LUN 0 is assumed to already have been | |
1000 | * scanned) to some maximum lun until a LUN is found with no device | |
1001 | * attached. Use the bflags to figure out any oddities. | |
1002 | * | |
1003 | * Modifies sdevscan->lun. | |
1004 | **/ | |
1005 | static void scsi_sequential_lun_scan(struct scsi_target *starget, | |
1006 | int bflags, int scsi_level, int rescan) | |
1007 | { | |
1008 | unsigned int sparse_lun, lun, max_dev_lun; | |
1009 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
1010 | ||
1011 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of" | |
1012 | "%s\n", starget->dev.bus_id)); | |
1013 | ||
1014 | max_dev_lun = min(max_scsi_luns, shost->max_lun); | |
1015 | /* | |
1016 | * If this device is known to support sparse multiple units, | |
1017 | * override the other settings, and scan all of them. Normally, | |
1018 | * SCSI-3 devices should be scanned via the REPORT LUNS. | |
1019 | */ | |
1020 | if (bflags & BLIST_SPARSELUN) { | |
1021 | max_dev_lun = shost->max_lun; | |
1022 | sparse_lun = 1; | |
1023 | } else | |
1024 | sparse_lun = 0; | |
1025 | ||
1026 | /* | |
1027 | * If less than SCSI_1_CSS, and no special lun scaning, stop | |
1028 | * scanning; this matches 2.4 behaviour, but could just be a bug | |
1029 | * (to continue scanning a SCSI_1_CSS device). | |
1030 | * | |
1031 | * This test is broken. We might not have any device on lun0 for | |
1032 | * a sparselun device, and if that's the case then how would we | |
1033 | * know the real scsi_level, eh? It might make sense to just not | |
1034 | * scan any SCSI_1 device for non-0 luns, but that check would best | |
1035 | * go into scsi_alloc_sdev() and just have it return null when asked | |
1036 | * to alloc an sdev for lun > 0 on an already found SCSI_1 device. | |
1037 | * | |
1038 | if ((sdevscan->scsi_level < SCSI_1_CCS) && | |
1039 | ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN)) | |
1040 | == 0)) | |
1041 | return; | |
1042 | */ | |
1043 | /* | |
1044 | * If this device is known to support multiple units, override | |
1045 | * the other settings, and scan all of them. | |
1046 | */ | |
1047 | if (bflags & BLIST_FORCELUN) | |
1048 | max_dev_lun = shost->max_lun; | |
1049 | /* | |
1050 | * REGAL CDC-4X: avoid hang after LUN 4 | |
1051 | */ | |
1052 | if (bflags & BLIST_MAX5LUN) | |
1053 | max_dev_lun = min(5U, max_dev_lun); | |
1054 | /* | |
1055 | * Do not scan SCSI-2 or lower device past LUN 7, unless | |
1056 | * BLIST_LARGELUN. | |
1057 | */ | |
1058 | if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN)) | |
1059 | max_dev_lun = min(8U, max_dev_lun); | |
1060 | ||
1061 | /* | |
1062 | * We have already scanned LUN 0, so start at LUN 1. Keep scanning | |
1063 | * until we reach the max, or no LUN is found and we are not | |
1064 | * sparse_lun. | |
1065 | */ | |
1066 | for (lun = 1; lun < max_dev_lun; ++lun) | |
1067 | if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, | |
1068 | NULL) != SCSI_SCAN_LUN_PRESENT) && | |
1069 | !sparse_lun) | |
1070 | return; | |
1071 | } | |
1072 | ||
1073 | /** | |
1074 | * scsilun_to_int: convert a scsi_lun to an int | |
1075 | * @scsilun: struct scsi_lun to be converted. | |
1076 | * | |
1077 | * Description: | |
1078 | * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered | |
1079 | * integer, and return the result. The caller must check for | |
1080 | * truncation before using this function. | |
1081 | * | |
1082 | * Notes: | |
1083 | * The struct scsi_lun is assumed to be four levels, with each level | |
1084 | * effectively containing a SCSI byte-ordered (big endian) short; the | |
1085 | * addressing bits of each level are ignored (the highest two bits). | |
1086 | * For a description of the LUN format, post SCSI-3 see the SCSI | |
1087 | * Architecture Model, for SCSI-3 see the SCSI Controller Commands. | |
1088 | * | |
1089 | * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns | |
1090 | * the integer: 0x0b030a04 | |
1091 | **/ | |
1092 | static int scsilun_to_int(struct scsi_lun *scsilun) | |
1093 | { | |
1094 | int i; | |
1095 | unsigned int lun; | |
1096 | ||
1097 | lun = 0; | |
1098 | for (i = 0; i < sizeof(lun); i += 2) | |
1099 | lun = lun | (((scsilun->scsi_lun[i] << 8) | | |
1100 | scsilun->scsi_lun[i + 1]) << (i * 8)); | |
1101 | return lun; | |
1102 | } | |
1103 | ||
1104 | /** | |
1105 | * int_to_scsilun: reverts an int into a scsi_lun | |
1106 | * @int: integer to be reverted | |
1107 | * @scsilun: struct scsi_lun to be set. | |
1108 | * | |
1109 | * Description: | |
1110 | * Reverts the functionality of the scsilun_to_int, which packed | |
1111 | * an 8-byte lun value into an int. This routine unpacks the int | |
1112 | * back into the lun value. | |
1113 | * Note: the scsilun_to_int() routine does not truly handle all | |
1114 | * 8bytes of the lun value. This functions restores only as much | |
1115 | * as was set by the routine. | |
1116 | * | |
1117 | * Notes: | |
1118 | * Given an integer : 0x0b030a04, this function returns a | |
1119 | * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00 | |
1120 | * | |
1121 | **/ | |
1122 | void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun) | |
1123 | { | |
1124 | int i; | |
1125 | ||
1126 | memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun)); | |
1127 | ||
1128 | for (i = 0; i < sizeof(lun); i += 2) { | |
1129 | scsilun->scsi_lun[i] = (lun >> 8) & 0xFF; | |
1130 | scsilun->scsi_lun[i+1] = lun & 0xFF; | |
1131 | lun = lun >> 16; | |
1132 | } | |
1133 | } | |
1134 | EXPORT_SYMBOL(int_to_scsilun); | |
1135 | ||
1136 | /** | |
1137 | * scsi_report_lun_scan - Scan using SCSI REPORT LUN results | |
1138 | * @sdevscan: scan the host, channel, and id of this scsi_device | |
1139 | * | |
1140 | * Description: | |
1141 | * If @sdevscan is for a SCSI-3 or up device, send a REPORT LUN | |
1142 | * command, and scan the resulting list of LUNs by calling | |
1143 | * scsi_probe_and_add_lun. | |
1144 | * | |
1145 | * Modifies sdevscan->lun. | |
1146 | * | |
1147 | * Return: | |
1148 | * 0: scan completed (or no memory, so further scanning is futile) | |
1149 | * 1: no report lun scan, or not configured | |
1150 | **/ | |
1151 | static int scsi_report_lun_scan(struct scsi_target *starget, int bflags, | |
1152 | int rescan) | |
1153 | { | |
1154 | char devname[64]; | |
1155 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
1156 | unsigned int length; | |
1157 | unsigned int lun; | |
1158 | unsigned int num_luns; | |
1159 | unsigned int retries; | |
1160 | int result; | |
1161 | struct scsi_lun *lunp, *lun_data; | |
1162 | u8 *data; | |
1163 | struct scsi_sense_hdr sshdr; | |
1164 | struct scsi_device *sdev; | |
1165 | struct Scsi_Host *shost = dev_to_shost(&starget->dev); | |
1166 | int ret = 0; | |
1167 | ||
1168 | /* | |
1169 | * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set. | |
1170 | * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does | |
1171 | * support more than 8 LUNs. | |
1172 | */ | |
1173 | if (bflags & BLIST_NOREPORTLUN) | |
1174 | return 1; | |
1175 | if (starget->scsi_level < SCSI_2 && | |
1176 | starget->scsi_level != SCSI_UNKNOWN) | |
1177 | return 1; | |
1178 | if (starget->scsi_level < SCSI_3 && | |
1179 | (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) | |
1180 | return 1; | |
1181 | if (bflags & BLIST_NOLUN) | |
1182 | return 0; | |
1183 | ||
1184 | if (!(sdev = scsi_device_lookup_by_target(starget, 0))) { | |
1185 | sdev = scsi_alloc_sdev(starget, 0, NULL); | |
1186 | if (!sdev) | |
1187 | return 0; | |
1188 | if (scsi_device_get(sdev)) | |
1189 | return 0; | |
1190 | } | |
1191 | ||
1192 | sprintf(devname, "host %d channel %d id %d", | |
1193 | shost->host_no, sdev->channel, sdev->id); | |
1194 | ||
1195 | /* | |
1196 | * Allocate enough to hold the header (the same size as one scsi_lun) | |
1197 | * plus the max number of luns we are requesting. | |
1198 | * | |
1199 | * Reallocating and trying again (with the exact amount we need) | |
1200 | * would be nice, but then we need to somehow limit the size | |
1201 | * allocated based on the available memory and the limits of | |
1202 | * kmalloc - we don't want a kmalloc() failure of a huge value to | |
1203 | * prevent us from finding any LUNs on this target. | |
1204 | */ | |
1205 | length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun); | |
1206 | lun_data = kmalloc(length, GFP_ATOMIC | | |
1207 | (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0)); | |
1208 | if (!lun_data) { | |
1209 | printk(ALLOC_FAILURE_MSG, __FUNCTION__); | |
1210 | goto out; | |
1211 | } | |
1212 | ||
1213 | scsi_cmd[0] = REPORT_LUNS; | |
1214 | ||
1215 | /* | |
1216 | * bytes 1 - 5: reserved, set to zero. | |
1217 | */ | |
1218 | memset(&scsi_cmd[1], 0, 5); | |
1219 | ||
1220 | /* | |
1221 | * bytes 6 - 9: length of the command. | |
1222 | */ | |
1223 | scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff; | |
1224 | scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff; | |
1225 | scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff; | |
1226 | scsi_cmd[9] = (unsigned char) length & 0xff; | |
1227 | ||
1228 | scsi_cmd[10] = 0; /* reserved */ | |
1229 | scsi_cmd[11] = 0; /* control */ | |
1230 | ||
1231 | /* | |
1232 | * We can get a UNIT ATTENTION, for example a power on/reset, so | |
1233 | * retry a few times (like sd.c does for TEST UNIT READY). | |
1234 | * Experience shows some combinations of adapter/devices get at | |
1235 | * least two power on/resets. | |
1236 | * | |
1237 | * Illegal requests (for devices that do not support REPORT LUNS) | |
1238 | * should come through as a check condition, and will not generate | |
1239 | * a retry. | |
1240 | */ | |
1241 | for (retries = 0; retries < 3; retries++) { | |
1242 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending" | |
1243 | " REPORT LUNS to %s (try %d)\n", devname, | |
1244 | retries)); | |
1245 | ||
1246 | result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, | |
1247 | lun_data, length, &sshdr, | |
1248 | SCSI_TIMEOUT + 4 * HZ, 3); | |
1249 | ||
1250 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS" | |
1251 | " %s (try %d) result 0x%x\n", result | |
1252 | ? "failed" : "successful", retries, result)); | |
1253 | if (result == 0) | |
1254 | break; | |
1255 | else if (scsi_sense_valid(&sshdr)) { | |
1256 | if (sshdr.sense_key != UNIT_ATTENTION) | |
1257 | break; | |
1258 | } | |
1259 | } | |
1260 | ||
1261 | if (result) { | |
1262 | /* | |
1263 | * The device probably does not support a REPORT LUN command | |
1264 | */ | |
1265 | ret = 1; | |
1266 | goto out_err; | |
1267 | } | |
1268 | ||
1269 | /* | |
1270 | * Get the length from the first four bytes of lun_data. | |
1271 | */ | |
1272 | data = (u8 *) lun_data->scsi_lun; | |
1273 | length = ((data[0] << 24) | (data[1] << 16) | | |
1274 | (data[2] << 8) | (data[3] << 0)); | |
1275 | ||
1276 | num_luns = (length / sizeof(struct scsi_lun)); | |
1277 | if (num_luns > max_scsi_report_luns) { | |
1278 | printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)" | |
1279 | " of %d luns reported, try increasing" | |
1280 | " max_scsi_report_luns.\n", devname, | |
1281 | max_scsi_report_luns, num_luns); | |
1282 | num_luns = max_scsi_report_luns; | |
1283 | } | |
1284 | ||
1285 | SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, | |
1286 | "scsi scan: REPORT LUN scan\n")); | |
1287 | ||
1288 | /* | |
1289 | * Scan the luns in lun_data. The entry at offset 0 is really | |
1290 | * the header, so start at 1 and go up to and including num_luns. | |
1291 | */ | |
1292 | for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) { | |
1293 | lun = scsilun_to_int(lunp); | |
1294 | ||
1295 | /* | |
1296 | * Check if the unused part of lunp is non-zero, and so | |
1297 | * does not fit in lun. | |
1298 | */ | |
1299 | if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) { | |
1300 | int i; | |
1301 | ||
1302 | /* | |
1303 | * Output an error displaying the LUN in byte order, | |
1304 | * this differs from what linux would print for the | |
1305 | * integer LUN value. | |
1306 | */ | |
1307 | printk(KERN_WARNING "scsi: %s lun 0x", devname); | |
1308 | data = (char *)lunp->scsi_lun; | |
1309 | for (i = 0; i < sizeof(struct scsi_lun); i++) | |
1310 | printk("%02x", data[i]); | |
1311 | printk(" has a LUN larger than currently supported.\n"); | |
1312 | } else if (lun > sdev->host->max_lun) { | |
1313 | printk(KERN_WARNING "scsi: %s lun%d has a LUN larger" | |
1314 | " than allowed by the host adapter\n", | |
1315 | devname, lun); | |
1316 | } else { | |
1317 | int res; | |
1318 | ||
1319 | res = scsi_probe_and_add_lun(starget, | |
1320 | lun, NULL, NULL, rescan, NULL); | |
1321 | if (res == SCSI_SCAN_NO_RESPONSE) { | |
1322 | /* | |
1323 | * Got some results, but now none, abort. | |
1324 | */ | |
1325 | sdev_printk(KERN_ERR, sdev, | |
1326 | "Unexpected response" | |
1327 | " from lun %d while scanning, scan" | |
1328 | " aborted\n", lun); | |
1329 | break; | |
1330 | } | |
1331 | } | |
1332 | } | |
1333 | ||
1334 | out_err: | |
1335 | kfree(lun_data); | |
1336 | out: | |
1337 | scsi_device_put(sdev); | |
1338 | if (sdev->sdev_state == SDEV_CREATED) | |
1339 | /* | |
1340 | * the sdev we used didn't appear in the report luns scan | |
1341 | */ | |
1342 | scsi_destroy_sdev(sdev); | |
1343 | return ret; | |
1344 | } | |
1345 | ||
1346 | struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel, | |
1347 | uint id, uint lun, void *hostdata) | |
1348 | { | |
1349 | struct scsi_device *sdev = ERR_PTR(-ENODEV); | |
1350 | struct device *parent = &shost->shost_gendev; | |
1351 | struct scsi_target *starget; | |
1352 | ||
1353 | starget = scsi_alloc_target(parent, channel, id); | |
1354 | if (!starget) | |
1355 | return ERR_PTR(-ENOMEM); | |
1356 | ||
1357 | mutex_lock(&shost->scan_mutex); | |
1358 | if (scsi_host_scan_allowed(shost)) | |
1359 | scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata); | |
1360 | mutex_unlock(&shost->scan_mutex); | |
1361 | scsi_target_reap(starget); | |
1362 | put_device(&starget->dev); | |
1363 | ||
1364 | return sdev; | |
1365 | } | |
1366 | EXPORT_SYMBOL(__scsi_add_device); | |
1367 | ||
1368 | int scsi_add_device(struct Scsi_Host *host, uint channel, | |
1369 | uint target, uint lun) | |
1370 | { | |
1371 | struct scsi_device *sdev = | |
1372 | __scsi_add_device(host, channel, target, lun, NULL); | |
1373 | if (IS_ERR(sdev)) | |
1374 | return PTR_ERR(sdev); | |
1375 | ||
1376 | scsi_device_put(sdev); | |
1377 | return 0; | |
1378 | } | |
1379 | EXPORT_SYMBOL(scsi_add_device); | |
1380 | ||
1381 | void scsi_rescan_device(struct device *dev) | |
1382 | { | |
1383 | struct scsi_driver *drv; | |
1384 | ||
1385 | if (!dev->driver) | |
1386 | return; | |
1387 | ||
1388 | drv = to_scsi_driver(dev->driver); | |
1389 | if (try_module_get(drv->owner)) { | |
1390 | if (drv->rescan) | |
1391 | drv->rescan(dev); | |
1392 | module_put(drv->owner); | |
1393 | } | |
1394 | } | |
1395 | EXPORT_SYMBOL(scsi_rescan_device); | |
1396 | ||
1397 | static void __scsi_scan_target(struct device *parent, unsigned int channel, | |
1398 | unsigned int id, unsigned int lun, int rescan) | |
1399 | { | |
1400 | struct Scsi_Host *shost = dev_to_shost(parent); | |
1401 | int bflags = 0; | |
1402 | int res; | |
1403 | struct scsi_target *starget; | |
1404 | ||
1405 | if (shost->this_id == id) | |
1406 | /* | |
1407 | * Don't scan the host adapter | |
1408 | */ | |
1409 | return; | |
1410 | ||
1411 | starget = scsi_alloc_target(parent, channel, id); | |
1412 | if (!starget) | |
1413 | return; | |
1414 | ||
1415 | if (lun != SCAN_WILD_CARD) { | |
1416 | /* | |
1417 | * Scan for a specific host/chan/id/lun. | |
1418 | */ | |
1419 | scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL); | |
1420 | goto out_reap; | |
1421 | } | |
1422 | ||
1423 | /* | |
1424 | * Scan LUN 0, if there is some response, scan further. Ideally, we | |
1425 | * would not configure LUN 0 until all LUNs are scanned. | |
1426 | */ | |
1427 | res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL); | |
1428 | if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) { | |
1429 | if (scsi_report_lun_scan(starget, bflags, rescan) != 0) | |
1430 | /* | |
1431 | * The REPORT LUN did not scan the target, | |
1432 | * do a sequential scan. | |
1433 | */ | |
1434 | scsi_sequential_lun_scan(starget, bflags, | |
1435 | starget->scsi_level, rescan); | |
1436 | } | |
1437 | ||
1438 | out_reap: | |
1439 | /* now determine if the target has any children at all | |
1440 | * and if not, nuke it */ | |
1441 | scsi_target_reap(starget); | |
1442 | ||
1443 | put_device(&starget->dev); | |
1444 | } | |
1445 | ||
1446 | /** | |
1447 | * scsi_scan_target - scan a target id, possibly including all LUNs on the | |
1448 | * target. | |
1449 | * @parent: host to scan | |
1450 | * @channel: channel to scan | |
1451 | * @id: target id to scan | |
1452 | * @lun: Specific LUN to scan or SCAN_WILD_CARD | |
1453 | * @rescan: passed to LUN scanning routines | |
1454 | * | |
1455 | * Description: | |
1456 | * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0, | |
1457 | * and possibly all LUNs on the target id. | |
1458 | * | |
1459 | * First try a REPORT LUN scan, if that does not scan the target, do a | |
1460 | * sequential scan of LUNs on the target id. | |
1461 | **/ | |
1462 | void scsi_scan_target(struct device *parent, unsigned int channel, | |
1463 | unsigned int id, unsigned int lun, int rescan) | |
1464 | { | |
1465 | struct Scsi_Host *shost = dev_to_shost(parent); | |
1466 | ||
1467 | mutex_lock(&shost->scan_mutex); | |
1468 | if (scsi_host_scan_allowed(shost)) | |
1469 | __scsi_scan_target(parent, channel, id, lun, rescan); | |
1470 | mutex_unlock(&shost->scan_mutex); | |
1471 | } | |
1472 | EXPORT_SYMBOL(scsi_scan_target); | |
1473 | ||
1474 | static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel, | |
1475 | unsigned int id, unsigned int lun, int rescan) | |
1476 | { | |
1477 | uint order_id; | |
1478 | ||
1479 | if (id == SCAN_WILD_CARD) | |
1480 | for (id = 0; id < shost->max_id; ++id) { | |
1481 | /* | |
1482 | * XXX adapter drivers when possible (FCP, iSCSI) | |
1483 | * could modify max_id to match the current max, | |
1484 | * not the absolute max. | |
1485 | * | |
1486 | * XXX add a shost id iterator, so for example, | |
1487 | * the FC ID can be the same as a target id | |
1488 | * without a huge overhead of sparse id's. | |
1489 | */ | |
1490 | if (shost->reverse_ordering) | |
1491 | /* | |
1492 | * Scan from high to low id. | |
1493 | */ | |
1494 | order_id = shost->max_id - id - 1; | |
1495 | else | |
1496 | order_id = id; | |
1497 | __scsi_scan_target(&shost->shost_gendev, channel, | |
1498 | order_id, lun, rescan); | |
1499 | } | |
1500 | else | |
1501 | __scsi_scan_target(&shost->shost_gendev, channel, | |
1502 | id, lun, rescan); | |
1503 | } | |
1504 | ||
1505 | int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel, | |
1506 | unsigned int id, unsigned int lun, int rescan) | |
1507 | { | |
1508 | SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost, | |
1509 | "%s: <%u:%u:%u>\n", | |
1510 | __FUNCTION__, channel, id, lun)); | |
1511 | ||
1512 | if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) || | |
1513 | ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) || | |
1514 | ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun))) | |
1515 | return -EINVAL; | |
1516 | ||
1517 | mutex_lock(&shost->scan_mutex); | |
1518 | if (scsi_host_scan_allowed(shost)) { | |
1519 | if (channel == SCAN_WILD_CARD) | |
1520 | for (channel = 0; channel <= shost->max_channel; | |
1521 | channel++) | |
1522 | scsi_scan_channel(shost, channel, id, lun, | |
1523 | rescan); | |
1524 | else | |
1525 | scsi_scan_channel(shost, channel, id, lun, rescan); | |
1526 | } | |
1527 | mutex_unlock(&shost->scan_mutex); | |
1528 | ||
1529 | return 0; | |
1530 | } | |
1531 | ||
1532 | /** | |
1533 | * scsi_scan_host - scan the given adapter | |
1534 | * @shost: adapter to scan | |
1535 | **/ | |
1536 | void scsi_scan_host(struct Scsi_Host *shost) | |
1537 | { | |
1538 | scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD, | |
1539 | SCAN_WILD_CARD, 0); | |
1540 | } | |
1541 | EXPORT_SYMBOL(scsi_scan_host); | |
1542 | ||
1543 | void scsi_forget_host(struct Scsi_Host *shost) | |
1544 | { | |
1545 | struct scsi_device *sdev; | |
1546 | unsigned long flags; | |
1547 | ||
1548 | restart: | |
1549 | spin_lock_irqsave(shost->host_lock, flags); | |
1550 | list_for_each_entry(sdev, &shost->__devices, siblings) { | |
1551 | if (sdev->sdev_state == SDEV_DEL) | |
1552 | continue; | |
1553 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1554 | __scsi_remove_device(sdev); | |
1555 | goto restart; | |
1556 | } | |
1557 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1558 | } | |
1559 | ||
1560 | /* | |
1561 | * Function: scsi_get_host_dev() | |
1562 | * | |
1563 | * Purpose: Create a scsi_device that points to the host adapter itself. | |
1564 | * | |
1565 | * Arguments: SHpnt - Host that needs a scsi_device | |
1566 | * | |
1567 | * Lock status: None assumed. | |
1568 | * | |
1569 | * Returns: The scsi_device or NULL | |
1570 | * | |
1571 | * Notes: | |
1572 | * Attach a single scsi_device to the Scsi_Host - this should | |
1573 | * be made to look like a "pseudo-device" that points to the | |
1574 | * HA itself. | |
1575 | * | |
1576 | * Note - this device is not accessible from any high-level | |
1577 | * drivers (including generics), which is probably not | |
1578 | * optimal. We can add hooks later to attach | |
1579 | */ | |
1580 | struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost) | |
1581 | { | |
1582 | struct scsi_device *sdev = NULL; | |
1583 | struct scsi_target *starget; | |
1584 | ||
1585 | mutex_lock(&shost->scan_mutex); | |
1586 | if (!scsi_host_scan_allowed(shost)) | |
1587 | goto out; | |
1588 | starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id); | |
1589 | if (!starget) | |
1590 | goto out; | |
1591 | ||
1592 | sdev = scsi_alloc_sdev(starget, 0, NULL); | |
1593 | if (sdev) { | |
1594 | sdev->sdev_gendev.parent = get_device(&starget->dev); | |
1595 | sdev->borken = 0; | |
1596 | } else | |
1597 | scsi_target_reap(starget); | |
1598 | put_device(&starget->dev); | |
1599 | out: | |
1600 | mutex_unlock(&shost->scan_mutex); | |
1601 | return sdev; | |
1602 | } | |
1603 | EXPORT_SYMBOL(scsi_get_host_dev); | |
1604 | ||
1605 | /* | |
1606 | * Function: scsi_free_host_dev() | |
1607 | * | |
1608 | * Purpose: Free a scsi_device that points to the host adapter itself. | |
1609 | * | |
1610 | * Arguments: SHpnt - Host that needs a scsi_device | |
1611 | * | |
1612 | * Lock status: None assumed. | |
1613 | * | |
1614 | * Returns: Nothing | |
1615 | * | |
1616 | * Notes: | |
1617 | */ | |
1618 | void scsi_free_host_dev(struct scsi_device *sdev) | |
1619 | { | |
1620 | BUG_ON(sdev->id != sdev->host->this_id); | |
1621 | ||
1622 | scsi_destroy_sdev(sdev); | |
1623 | } | |
1624 | EXPORT_SYMBOL(scsi_free_host_dev); | |
1625 |