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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 | |
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/config.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/moduleparam.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/blkdev.h> | |
33 | #include <asm/semaphore.h> | |
34 | ||
35 | #include <scsi/scsi.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_request.h> | |
41 | #include <scsi/scsi_transport.h> | |
42 | #include <scsi/scsi_eh.h> | |
43 | ||
44 | #include "scsi_priv.h" | |
45 | #include "scsi_logging.h" | |
46 | ||
47 | #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \ | |
48 | " SCSI scanning, some SCSI devices might not be configured\n" | |
49 | ||
50 | /* | |
51 | * Default timeout | |
52 | */ | |
53 | #define SCSI_TIMEOUT (2*HZ) | |
54 | ||
55 | /* | |
56 | * Prefix values for the SCSI id's (stored in driverfs name field) | |
57 | */ | |
58 | #define SCSI_UID_SER_NUM 'S' | |
59 | #define SCSI_UID_UNKNOWN 'Z' | |
60 | ||
61 | /* | |
62 | * Return values of some of the scanning functions. | |
63 | * | |
64 | * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this | |
65 | * includes allocation or general failures preventing IO from being sent. | |
66 | * | |
67 | * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available | |
68 | * on the given LUN. | |
69 | * | |
70 | * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a | |
71 | * given LUN. | |
72 | */ | |
73 | #define SCSI_SCAN_NO_RESPONSE 0 | |
74 | #define SCSI_SCAN_TARGET_PRESENT 1 | |
75 | #define SCSI_SCAN_LUN_PRESENT 2 | |
76 | ||
77 | static char *scsi_null_device_strs = "nullnullnullnull"; | |
78 | ||
79 | #define MAX_SCSI_LUNS 512 | |
80 | ||
81 | #ifdef CONFIG_SCSI_MULTI_LUN | |
82 | static unsigned int max_scsi_luns = MAX_SCSI_LUNS; | |
83 | #else | |
84 | static unsigned int max_scsi_luns = 1; | |
85 | #endif | |
86 | ||
87 | module_param_named(max_luns, max_scsi_luns, int, S_IRUGO|S_IWUSR); | |
88 | MODULE_PARM_DESC(max_luns, | |
89 | "last scsi LUN (should be between 1 and 2^32-1)"); | |
90 | ||
91 | /* | |
92 | * max_scsi_report_luns: the maximum number of LUNS that will be | |
93 | * returned from the REPORT LUNS command. 8 times this value must | |
94 | * be allocated. In theory this could be up to an 8 byte value, but | |
95 | * in practice, the maximum number of LUNs suppored by any device | |
96 | * is about 16k. | |
97 | */ | |
98 | static unsigned int max_scsi_report_luns = 511; | |
99 | ||
100 | module_param_named(max_report_luns, max_scsi_report_luns, int, S_IRUGO|S_IWUSR); | |
101 | MODULE_PARM_DESC(max_report_luns, | |
102 | "REPORT LUNS maximum number of LUNS received (should be" | |
103 | " between 1 and 16384)"); | |
104 | ||
105 | static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+3; | |
106 | ||
107 | module_param_named(inq_timeout, scsi_inq_timeout, int, S_IRUGO|S_IWUSR); | |
108 | MODULE_PARM_DESC(inq_timeout, | |
109 | "Timeout (in seconds) waiting for devices to answer INQUIRY." | |
110 | " Default is 5. Some non-compliant devices need more."); | |
111 | ||
112 | /** | |
113 | * scsi_unlock_floptical - unlock device via a special MODE SENSE command | |
114 | * @sreq: used to send the command | |
115 | * @result: area to store the result of the MODE SENSE | |
116 | * | |
117 | * Description: | |
118 | * Send a vendor specific MODE SENSE (not a MODE SELECT) command using | |
119 | * @sreq to unlock a device, storing the (unused) results into result. | |
120 | * Called for BLIST_KEY devices. | |
121 | **/ | |
122 | static void scsi_unlock_floptical(struct scsi_request *sreq, | |
123 | unsigned char *result) | |
124 | { | |
125 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
126 | ||
127 | printk(KERN_NOTICE "scsi: unlocking floptical drive\n"); | |
128 | scsi_cmd[0] = MODE_SENSE; | |
129 | scsi_cmd[1] = 0; | |
130 | scsi_cmd[2] = 0x2e; | |
131 | scsi_cmd[3] = 0; | |
132 | scsi_cmd[4] = 0x2a; /* size */ | |
133 | scsi_cmd[5] = 0; | |
134 | sreq->sr_cmd_len = 0; | |
135 | sreq->sr_data_direction = DMA_FROM_DEVICE; | |
136 | scsi_wait_req(sreq, scsi_cmd, result, 0x2a /* size */, SCSI_TIMEOUT, 3); | |
137 | } | |
138 | ||
139 | /** | |
140 | * print_inquiry - printk the inquiry information | |
141 | * @inq_result: printk this SCSI INQUIRY | |
142 | * | |
143 | * Description: | |
144 | * printk the vendor, model, and other information found in the | |
145 | * INQUIRY data in @inq_result. | |
146 | * | |
147 | * Notes: | |
148 | * Remove this, and replace with a hotplug event that logs any | |
149 | * relevant information. | |
150 | **/ | |
151 | static void print_inquiry(unsigned char *inq_result) | |
152 | { | |
153 | int i; | |
154 | ||
155 | printk(KERN_NOTICE " Vendor: "); | |
156 | for (i = 8; i < 16; i++) | |
157 | if (inq_result[i] >= 0x20 && i < inq_result[4] + 5) | |
158 | printk("%c", inq_result[i]); | |
159 | else | |
160 | printk(" "); | |
161 | ||
162 | printk(" Model: "); | |
163 | for (i = 16; i < 32; i++) | |
164 | if (inq_result[i] >= 0x20 && i < inq_result[4] + 5) | |
165 | printk("%c", inq_result[i]); | |
166 | else | |
167 | printk(" "); | |
168 | ||
169 | printk(" Rev: "); | |
170 | for (i = 32; i < 36; i++) | |
171 | if (inq_result[i] >= 0x20 && i < inq_result[4] + 5) | |
172 | printk("%c", inq_result[i]); | |
173 | else | |
174 | printk(" "); | |
175 | ||
176 | printk("\n"); | |
177 | ||
178 | i = inq_result[0] & 0x1f; | |
179 | ||
180 | printk(KERN_NOTICE " Type: %s ", | |
181 | i < | |
182 | MAX_SCSI_DEVICE_CODE ? scsi_device_types[i] : | |
183 | "Unknown "); | |
184 | printk(" ANSI SCSI revision: %02x", | |
185 | inq_result[2] & 0x07); | |
186 | if ((inq_result[2] & 0x07) == 1 && (inq_result[3] & 0x0f) == 1) | |
187 | printk(" CCS\n"); | |
188 | else | |
189 | printk("\n"); | |
190 | } | |
191 | ||
192 | /** | |
193 | * scsi_alloc_sdev - allocate and setup a scsi_Device | |
194 | * | |
195 | * Description: | |
196 | * Allocate, initialize for io, and return a pointer to a scsi_Device. | |
197 | * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and | |
198 | * adds scsi_Device to the appropriate list. | |
199 | * | |
200 | * Return value: | |
201 | * scsi_Device pointer, or NULL on failure. | |
202 | **/ | |
203 | static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, | |
204 | unsigned int lun, void *hostdata) | |
205 | { | |
206 | struct scsi_device *sdev; | |
207 | int display_failure_msg = 1, ret; | |
208 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
209 | ||
210 | sdev = kmalloc(sizeof(*sdev) + shost->transportt->device_size, | |
211 | GFP_ATOMIC); | |
212 | if (!sdev) | |
213 | goto out; | |
214 | ||
215 | memset(sdev, 0, sizeof(*sdev)); | |
216 | sdev->vendor = scsi_null_device_strs; | |
217 | sdev->model = scsi_null_device_strs; | |
218 | sdev->rev = scsi_null_device_strs; | |
219 | sdev->host = shost; | |
220 | sdev->id = starget->id; | |
221 | sdev->lun = lun; | |
222 | sdev->channel = starget->channel; | |
223 | sdev->sdev_state = SDEV_CREATED; | |
224 | INIT_LIST_HEAD(&sdev->siblings); | |
225 | INIT_LIST_HEAD(&sdev->same_target_siblings); | |
226 | INIT_LIST_HEAD(&sdev->cmd_list); | |
227 | INIT_LIST_HEAD(&sdev->starved_entry); | |
228 | spin_lock_init(&sdev->list_lock); | |
229 | ||
230 | sdev->sdev_gendev.parent = get_device(&starget->dev); | |
231 | sdev->sdev_target = starget; | |
232 | ||
233 | /* usually NULL and set by ->slave_alloc instead */ | |
234 | sdev->hostdata = hostdata; | |
235 | ||
236 | /* if the device needs this changing, it may do so in the | |
237 | * slave_configure function */ | |
238 | sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED; | |
239 | ||
240 | /* | |
241 | * Some low level driver could use device->type | |
242 | */ | |
243 | sdev->type = -1; | |
244 | ||
245 | /* | |
246 | * Assume that the device will have handshaking problems, | |
247 | * and then fix this field later if it turns out it | |
248 | * doesn't | |
249 | */ | |
250 | sdev->borken = 1; | |
251 | ||
1da177e4 LT |
252 | sdev->request_queue = scsi_alloc_queue(sdev); |
253 | if (!sdev->request_queue) { | |
254 | /* release fn is set up in scsi_sysfs_device_initialise, so | |
255 | * have to free and put manually here */ | |
256 | put_device(&starget->dev); | |
257 | goto out; | |
258 | } | |
259 | ||
260 | sdev->request_queue->queuedata = sdev; | |
261 | scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun); | |
262 | ||
263 | scsi_sysfs_device_initialize(sdev); | |
264 | ||
265 | if (shost->hostt->slave_alloc) { | |
266 | ret = shost->hostt->slave_alloc(sdev); | |
267 | if (ret) { | |
268 | /* | |
269 | * if LLDD reports slave not present, don't clutter | |
270 | * console with alloc failure messages | |
271 | ||
272 | ||
273 | */ | |
274 | if (ret == -ENXIO) | |
275 | display_failure_msg = 0; | |
276 | goto out_device_destroy; | |
277 | } | |
278 | } | |
279 | ||
280 | return sdev; | |
281 | ||
282 | out_device_destroy: | |
283 | transport_destroy_device(&sdev->sdev_gendev); | |
284 | scsi_free_queue(sdev->request_queue); | |
285 | put_device(&sdev->sdev_gendev); | |
286 | out: | |
287 | if (display_failure_msg) | |
288 | printk(ALLOC_FAILURE_MSG, __FUNCTION__); | |
289 | return NULL; | |
290 | } | |
291 | ||
292 | static void scsi_target_dev_release(struct device *dev) | |
293 | { | |
294 | struct device *parent = dev->parent; | |
295 | struct scsi_target *starget = to_scsi_target(dev); | |
296 | kfree(starget); | |
297 | put_device(parent); | |
298 | } | |
299 | ||
300 | int scsi_is_target_device(const struct device *dev) | |
301 | { | |
302 | return dev->release == scsi_target_dev_release; | |
303 | } | |
304 | EXPORT_SYMBOL(scsi_is_target_device); | |
305 | ||
306 | static struct scsi_target *__scsi_find_target(struct device *parent, | |
307 | int channel, uint id) | |
308 | { | |
309 | struct scsi_target *starget, *found_starget = NULL; | |
310 | struct Scsi_Host *shost = dev_to_shost(parent); | |
311 | /* | |
312 | * Search for an existing target for this sdev. | |
313 | */ | |
314 | list_for_each_entry(starget, &shost->__targets, siblings) { | |
315 | if (starget->id == id && | |
316 | starget->channel == channel) { | |
317 | found_starget = starget; | |
318 | break; | |
319 | } | |
320 | } | |
321 | if (found_starget) | |
322 | get_device(&found_starget->dev); | |
323 | ||
324 | return found_starget; | |
325 | } | |
326 | ||
327 | static struct scsi_target *scsi_alloc_target(struct device *parent, | |
328 | int channel, uint id) | |
329 | { | |
330 | struct Scsi_Host *shost = dev_to_shost(parent); | |
331 | struct device *dev = NULL; | |
332 | unsigned long flags; | |
333 | const int size = sizeof(struct scsi_target) | |
334 | + shost->transportt->target_size; | |
335 | struct scsi_target *starget = kmalloc(size, GFP_ATOMIC); | |
336 | struct scsi_target *found_target; | |
337 | ||
338 | if (!starget) { | |
339 | printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__); | |
340 | return NULL; | |
341 | } | |
342 | memset(starget, 0, size); | |
343 | dev = &starget->dev; | |
344 | device_initialize(dev); | |
345 | starget->reap_ref = 1; | |
346 | dev->parent = get_device(parent); | |
347 | dev->release = scsi_target_dev_release; | |
348 | sprintf(dev->bus_id, "target%d:%d:%d", | |
349 | shost->host_no, channel, id); | |
350 | starget->id = id; | |
351 | starget->channel = channel; | |
352 | INIT_LIST_HEAD(&starget->siblings); | |
353 | INIT_LIST_HEAD(&starget->devices); | |
354 | spin_lock_irqsave(shost->host_lock, flags); | |
355 | ||
356 | found_target = __scsi_find_target(parent, channel, id); | |
357 | if (found_target) | |
358 | goto found; | |
359 | ||
360 | list_add_tail(&starget->siblings, &shost->__targets); | |
361 | spin_unlock_irqrestore(shost->host_lock, flags); | |
362 | /* allocate and add */ | |
363 | transport_setup_device(&starget->dev); | |
364 | device_add(&starget->dev); | |
365 | transport_add_device(&starget->dev); | |
366 | return starget; | |
367 | ||
368 | found: | |
369 | found_target->reap_ref++; | |
370 | spin_unlock_irqrestore(shost->host_lock, flags); | |
371 | put_device(parent); | |
372 | kfree(starget); | |
373 | return found_target; | |
374 | } | |
375 | ||
376 | /** | |
377 | * scsi_target_reap - check to see if target is in use and destroy if not | |
378 | * | |
379 | * @starget: target to be checked | |
380 | * | |
381 | * This is used after removing a LUN or doing a last put of the target | |
382 | * it checks atomically that nothing is using the target and removes | |
383 | * it if so. | |
384 | */ | |
385 | void scsi_target_reap(struct scsi_target *starget) | |
386 | { | |
387 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
388 | unsigned long flags; | |
389 | spin_lock_irqsave(shost->host_lock, flags); | |
390 | ||
391 | if (--starget->reap_ref == 0 && list_empty(&starget->devices)) { | |
392 | list_del_init(&starget->siblings); | |
393 | spin_unlock_irqrestore(shost->host_lock, flags); | |
394 | device_del(&starget->dev); | |
395 | transport_unregister_device(&starget->dev); | |
396 | put_device(&starget->dev); | |
397 | return; | |
398 | } | |
399 | spin_unlock_irqrestore(shost->host_lock, flags); | |
400 | } | |
401 | ||
402 | /** | |
403 | * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY | |
404 | * @sreq: used to send the INQUIRY | |
405 | * @inq_result: area to store the INQUIRY result | |
406 | * @bflags: store any bflags found here | |
407 | * | |
408 | * Description: | |
409 | * Probe the lun associated with @sreq using a standard SCSI INQUIRY; | |
410 | * | |
411 | * If the INQUIRY is successful, sreq->sr_result is zero and: the | |
412 | * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length | |
413 | * are copied to the Scsi_Device at @sreq->sr_device (sdev); | |
414 | * any flags value is stored in *@bflags. | |
415 | **/ | |
416 | static void scsi_probe_lun(struct scsi_request *sreq, char *inq_result, | |
417 | int *bflags) | |
418 | { | |
419 | struct scsi_device *sdev = sreq->sr_device; /* a bit ugly */ | |
420 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
421 | int first_inquiry_len, try_inquiry_len, next_inquiry_len; | |
422 | int response_len = 0; | |
423 | int pass, count; | |
424 | struct scsi_sense_hdr sshdr; | |
425 | ||
426 | *bflags = 0; | |
427 | ||
428 | /* Perform up to 3 passes. The first pass uses a conservative | |
429 | * transfer length of 36 unless sdev->inquiry_len specifies a | |
430 | * different value. */ | |
431 | first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36; | |
432 | try_inquiry_len = first_inquiry_len; | |
433 | pass = 1; | |
434 | ||
435 | next_pass: | |
436 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY pass %d " | |
437 | "to host %d channel %d id %d lun %d, length %d\n", | |
438 | pass, sdev->host->host_no, sdev->channel, | |
439 | sdev->id, sdev->lun, try_inquiry_len)); | |
440 | ||
441 | /* Each pass gets up to three chances to ignore Unit Attention */ | |
442 | for (count = 0; count < 3; ++count) { | |
443 | memset(scsi_cmd, 0, 6); | |
444 | scsi_cmd[0] = INQUIRY; | |
445 | scsi_cmd[4] = (unsigned char) try_inquiry_len; | |
446 | sreq->sr_cmd_len = 0; | |
447 | sreq->sr_data_direction = DMA_FROM_DEVICE; | |
448 | ||
449 | memset(inq_result, 0, try_inquiry_len); | |
450 | scsi_wait_req(sreq, (void *) scsi_cmd, (void *) inq_result, | |
451 | try_inquiry_len, | |
452 | HZ/2 + HZ*scsi_inq_timeout, 3); | |
453 | ||
454 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s " | |
455 | "with code 0x%x\n", | |
456 | sreq->sr_result ? "failed" : "successful", | |
457 | sreq->sr_result)); | |
458 | ||
459 | if (sreq->sr_result) { | |
460 | /* | |
461 | * not-ready to ready transition [asc/ascq=0x28/0x0] | |
462 | * or power-on, reset [asc/ascq=0x29/0x0], continue. | |
463 | * INQUIRY should not yield UNIT_ATTENTION | |
464 | * but many buggy devices do so anyway. | |
465 | */ | |
466 | if ((driver_byte(sreq->sr_result) & DRIVER_SENSE) && | |
467 | scsi_request_normalize_sense(sreq, &sshdr)) { | |
468 | if ((sshdr.sense_key == UNIT_ATTENTION) && | |
469 | ((sshdr.asc == 0x28) || | |
470 | (sshdr.asc == 0x29)) && | |
471 | (sshdr.ascq == 0)) | |
472 | continue; | |
473 | } | |
474 | } | |
475 | break; | |
476 | } | |
477 | ||
478 | if (sreq->sr_result == 0) { | |
479 | response_len = (unsigned char) inq_result[4] + 5; | |
480 | if (response_len > 255) | |
481 | response_len = first_inquiry_len; /* sanity */ | |
482 | ||
483 | /* | |
484 | * Get any flags for this device. | |
485 | * | |
486 | * XXX add a bflags to Scsi_Device, and replace the | |
487 | * corresponding bit fields in Scsi_Device, so bflags | |
488 | * need not be passed as an argument. | |
489 | */ | |
490 | *bflags = scsi_get_device_flags(sdev, &inq_result[8], | |
491 | &inq_result[16]); | |
492 | ||
493 | /* When the first pass succeeds we gain information about | |
494 | * what larger transfer lengths might work. */ | |
495 | if (pass == 1) { | |
496 | if (BLIST_INQUIRY_36 & *bflags) | |
497 | next_inquiry_len = 36; | |
498 | else if (BLIST_INQUIRY_58 & *bflags) | |
499 | next_inquiry_len = 58; | |
500 | else if (sdev->inquiry_len) | |
501 | next_inquiry_len = sdev->inquiry_len; | |
502 | else | |
503 | next_inquiry_len = response_len; | |
504 | ||
505 | /* If more data is available perform the second pass */ | |
506 | if (next_inquiry_len > try_inquiry_len) { | |
507 | try_inquiry_len = next_inquiry_len; | |
508 | pass = 2; | |
509 | goto next_pass; | |
510 | } | |
511 | } | |
512 | ||
513 | } else if (pass == 2) { | |
514 | printk(KERN_INFO "scsi scan: %d byte inquiry failed. " | |
515 | "Consider BLIST_INQUIRY_36 for this device\n", | |
516 | try_inquiry_len); | |
517 | ||
518 | /* If this pass failed, the third pass goes back and transfers | |
519 | * the same amount as we successfully got in the first pass. */ | |
520 | try_inquiry_len = first_inquiry_len; | |
521 | pass = 3; | |
522 | goto next_pass; | |
523 | } | |
524 | ||
525 | /* If the last transfer attempt got an error, assume the | |
526 | * peripheral doesn't exist or is dead. */ | |
527 | if (sreq->sr_result) | |
528 | return; | |
529 | ||
530 | /* Don't report any more data than the device says is valid */ | |
531 | sdev->inquiry_len = min(try_inquiry_len, response_len); | |
532 | ||
533 | /* | |
534 | * XXX Abort if the response length is less than 36? If less than | |
535 | * 32, the lookup of the device flags (above) could be invalid, | |
536 | * and it would be possible to take an incorrect action - we do | |
537 | * not want to hang because of a short INQUIRY. On the flip side, | |
538 | * if the device is spun down or becoming ready (and so it gives a | |
539 | * short INQUIRY), an abort here prevents any further use of the | |
540 | * device, including spin up. | |
541 | * | |
542 | * Related to the above issue: | |
543 | * | |
544 | * XXX Devices (disk or all?) should be sent a TEST UNIT READY, | |
545 | * and if not ready, sent a START_STOP to start (maybe spin up) and | |
546 | * then send the INQUIRY again, since the INQUIRY can change after | |
547 | * a device is initialized. | |
548 | * | |
549 | * Ideally, start a device if explicitly asked to do so. This | |
550 | * assumes that a device is spun up on power on, spun down on | |
551 | * request, and then spun up on request. | |
552 | */ | |
553 | ||
554 | /* | |
555 | * The scanning code needs to know the scsi_level, even if no | |
556 | * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so | |
557 | * non-zero LUNs can be scanned. | |
558 | */ | |
559 | sdev->scsi_level = inq_result[2] & 0x07; | |
560 | if (sdev->scsi_level >= 2 || | |
561 | (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1)) | |
562 | sdev->scsi_level++; | |
563 | ||
564 | return; | |
565 | } | |
566 | ||
567 | /** | |
568 | * scsi_add_lun - allocate and fully initialze a Scsi_Device | |
569 | * @sdevscan: holds information to be stored in the new Scsi_Device | |
570 | * @sdevnew: store the address of the newly allocated Scsi_Device | |
571 | * @inq_result: holds the result of a previous INQUIRY to the LUN | |
572 | * @bflags: black/white list flag | |
573 | * | |
574 | * Description: | |
575 | * Allocate and initialize a Scsi_Device matching sdevscan. Optionally | |
576 | * set fields based on values in *@bflags. If @sdevnew is not | |
577 | * NULL, store the address of the new Scsi_Device in *@sdevnew (needed | |
578 | * when scanning a particular LUN). | |
579 | * | |
580 | * Return: | |
581 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a Scsi_Device | |
582 | * SCSI_SCAN_LUN_PRESENT: a new Scsi_Device was allocated and initialized | |
583 | **/ | |
584 | static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags) | |
585 | { | |
586 | /* | |
587 | * XXX do not save the inquiry, since it can change underneath us, | |
588 | * save just vendor/model/rev. | |
589 | * | |
590 | * Rather than save it and have an ioctl that retrieves the saved | |
591 | * value, have an ioctl that executes the same INQUIRY code used | |
592 | * in scsi_probe_lun, let user level programs doing INQUIRY | |
593 | * scanning run at their own risk, or supply a user level program | |
594 | * that can correctly scan. | |
595 | */ | |
596 | sdev->inquiry = kmalloc(sdev->inquiry_len, GFP_ATOMIC); | |
597 | if (sdev->inquiry == NULL) { | |
598 | return SCSI_SCAN_NO_RESPONSE; | |
599 | } | |
600 | ||
601 | memcpy(sdev->inquiry, inq_result, sdev->inquiry_len); | |
602 | sdev->vendor = (char *) (sdev->inquiry + 8); | |
603 | sdev->model = (char *) (sdev->inquiry + 16); | |
604 | sdev->rev = (char *) (sdev->inquiry + 32); | |
605 | ||
606 | if (*bflags & BLIST_ISROM) { | |
607 | /* | |
608 | * It would be better to modify sdev->type, and set | |
609 | * sdev->removable, but then the print_inquiry() output | |
610 | * would not show TYPE_ROM; if print_inquiry() is removed | |
611 | * the issue goes away. | |
612 | */ | |
613 | inq_result[0] = TYPE_ROM; | |
614 | inq_result[1] |= 0x80; /* removable */ | |
615 | } else if (*bflags & BLIST_NO_ULD_ATTACH) | |
616 | sdev->no_uld_attach = 1; | |
617 | ||
618 | switch (sdev->type = (inq_result[0] & 0x1f)) { | |
619 | case TYPE_TAPE: | |
620 | case TYPE_DISK: | |
621 | case TYPE_PRINTER: | |
622 | case TYPE_MOD: | |
623 | case TYPE_PROCESSOR: | |
624 | case TYPE_SCANNER: | |
625 | case TYPE_MEDIUM_CHANGER: | |
626 | case TYPE_ENCLOSURE: | |
627 | case TYPE_COMM: | |
628 | sdev->writeable = 1; | |
629 | break; | |
630 | case TYPE_WORM: | |
631 | case TYPE_ROM: | |
632 | sdev->writeable = 0; | |
633 | break; | |
634 | default: | |
635 | printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type); | |
636 | } | |
637 | ||
638 | print_inquiry(inq_result); | |
639 | ||
640 | /* | |
641 | * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI | |
642 | * spec says: The device server is capable of supporting the | |
643 | * specified peripheral device type on this logical unit. However, | |
644 | * the physical device is not currently connected to this logical | |
645 | * unit. | |
646 | * | |
647 | * The above is vague, as it implies that we could treat 001 and | |
648 | * 011 the same. Stay compatible with previous code, and create a | |
649 | * Scsi_Device for a PQ of 1 | |
650 | * | |
651 | * Don't set the device offline here; rather let the upper | |
652 | * level drivers eval the PQ to decide whether they should | |
653 | * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check. | |
654 | */ | |
655 | ||
656 | sdev->inq_periph_qual = (inq_result[0] >> 5) & 7; | |
657 | sdev->removable = (0x80 & inq_result[1]) >> 7; | |
658 | sdev->lockable = sdev->removable; | |
659 | sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2); | |
660 | ||
661 | if (sdev->scsi_level >= SCSI_3 || (sdev->inquiry_len > 56 && | |
662 | inq_result[56] & 0x04)) | |
663 | sdev->ppr = 1; | |
664 | if (inq_result[7] & 0x60) | |
665 | sdev->wdtr = 1; | |
666 | if (inq_result[7] & 0x10) | |
667 | sdev->sdtr = 1; | |
668 | ||
669 | sprintf(sdev->devfs_name, "scsi/host%d/bus%d/target%d/lun%d", | |
670 | sdev->host->host_no, sdev->channel, | |
671 | sdev->id, sdev->lun); | |
672 | ||
673 | /* | |
674 | * End driverfs/devfs code. | |
675 | */ | |
676 | ||
677 | if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) && | |
678 | !(*bflags & BLIST_NOTQ)) | |
679 | sdev->tagged_supported = 1; | |
680 | /* | |
681 | * Some devices (Texel CD ROM drives) have handshaking problems | |
682 | * when used with the Seagate controllers. borken is initialized | |
683 | * to 1, and then set it to 0 here. | |
684 | */ | |
685 | if ((*bflags & BLIST_BORKEN) == 0) | |
686 | sdev->borken = 0; | |
687 | ||
688 | /* | |
689 | * Apparently some really broken devices (contrary to the SCSI | |
690 | * standards) need to be selected without asserting ATN | |
691 | */ | |
692 | if (*bflags & BLIST_SELECT_NO_ATN) | |
693 | sdev->select_no_atn = 1; | |
694 | ||
695 | /* | |
696 | * Some devices may not want to have a start command automatically | |
697 | * issued when a device is added. | |
698 | */ | |
699 | if (*bflags & BLIST_NOSTARTONADD) | |
700 | sdev->no_start_on_add = 1; | |
701 | ||
702 | if (*bflags & BLIST_SINGLELUN) | |
703 | sdev->single_lun = 1; | |
704 | ||
705 | ||
706 | sdev->use_10_for_rw = 1; | |
707 | ||
708 | if (*bflags & BLIST_MS_SKIP_PAGE_08) | |
709 | sdev->skip_ms_page_8 = 1; | |
710 | ||
711 | if (*bflags & BLIST_MS_SKIP_PAGE_3F) | |
712 | sdev->skip_ms_page_3f = 1; | |
713 | ||
714 | if (*bflags & BLIST_USE_10_BYTE_MS) | |
715 | sdev->use_10_for_ms = 1; | |
716 | ||
717 | /* set the device running here so that slave configure | |
718 | * may do I/O */ | |
719 | scsi_device_set_state(sdev, SDEV_RUNNING); | |
720 | ||
721 | if (*bflags & BLIST_MS_192_BYTES_FOR_3F) | |
722 | sdev->use_192_bytes_for_3f = 1; | |
723 | ||
724 | if (*bflags & BLIST_NOT_LOCKABLE) | |
725 | sdev->lockable = 0; | |
726 | ||
727 | if (*bflags & BLIST_RETRY_HWERROR) | |
728 | sdev->retry_hwerror = 1; | |
729 | ||
730 | transport_configure_device(&sdev->sdev_gendev); | |
731 | ||
732 | if (sdev->host->hostt->slave_configure) | |
733 | sdev->host->hostt->slave_configure(sdev); | |
734 | ||
735 | /* | |
736 | * Ok, the device is now all set up, we can | |
737 | * register it and tell the rest of the kernel | |
738 | * about it. | |
739 | */ | |
740 | scsi_sysfs_add_sdev(sdev); | |
741 | ||
742 | return SCSI_SCAN_LUN_PRESENT; | |
743 | } | |
744 | ||
745 | /** | |
746 | * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it | |
747 | * @starget: pointer to target device structure | |
748 | * @lun: LUN of target device | |
749 | * @sdevscan: probe the LUN corresponding to this Scsi_Device | |
750 | * @sdevnew: store the value of any new Scsi_Device allocated | |
751 | * @bflagsp: store bflags here if not NULL | |
752 | * | |
753 | * Description: | |
754 | * Call scsi_probe_lun, if a LUN with an attached device is found, | |
755 | * allocate and set it up by calling scsi_add_lun. | |
756 | * | |
757 | * Return: | |
758 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a Scsi_Device | |
759 | * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is | |
760 | * attached at the LUN | |
761 | * SCSI_SCAN_LUN_PRESENT: a new Scsi_Device was allocated and initialized | |
762 | **/ | |
763 | static int scsi_probe_and_add_lun(struct scsi_target *starget, | |
764 | uint lun, int *bflagsp, | |
765 | struct scsi_device **sdevp, int rescan, | |
766 | void *hostdata) | |
767 | { | |
768 | struct scsi_device *sdev; | |
769 | struct scsi_request *sreq; | |
770 | unsigned char *result; | |
771 | int bflags, res = SCSI_SCAN_NO_RESPONSE; | |
772 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
773 | ||
774 | /* | |
775 | * The rescan flag is used as an optimization, the first scan of a | |
776 | * host adapter calls into here with rescan == 0. | |
777 | */ | |
778 | if (rescan) { | |
779 | sdev = scsi_device_lookup_by_target(starget, lun); | |
780 | if (sdev) { | |
781 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO | |
782 | "scsi scan: device exists on %s\n", | |
783 | sdev->sdev_gendev.bus_id)); | |
784 | if (sdevp) | |
785 | *sdevp = sdev; | |
786 | else | |
787 | scsi_device_put(sdev); | |
788 | ||
789 | if (bflagsp) | |
790 | *bflagsp = scsi_get_device_flags(sdev, | |
791 | sdev->vendor, | |
792 | sdev->model); | |
793 | return SCSI_SCAN_LUN_PRESENT; | |
794 | } | |
795 | } | |
796 | ||
797 | sdev = scsi_alloc_sdev(starget, lun, hostdata); | |
798 | if (!sdev) | |
799 | goto out; | |
800 | sreq = scsi_allocate_request(sdev, GFP_ATOMIC); | |
801 | if (!sreq) | |
802 | goto out_free_sdev; | |
803 | result = kmalloc(256, GFP_ATOMIC | | |
bc86120a | 804 | ((shost->unchecked_isa_dma) ? __GFP_DMA : 0)); |
1da177e4 LT |
805 | if (!result) |
806 | goto out_free_sreq; | |
807 | ||
808 | scsi_probe_lun(sreq, result, &bflags); | |
809 | if (sreq->sr_result) | |
810 | goto out_free_result; | |
811 | ||
812 | /* | |
813 | * result contains valid SCSI INQUIRY data. | |
814 | */ | |
815 | if ((result[0] >> 5) == 3) { | |
816 | /* | |
817 | * For a Peripheral qualifier 3 (011b), the SCSI | |
818 | * spec says: The device server is not capable of | |
819 | * supporting a physical device on this logical | |
820 | * unit. | |
821 | * | |
822 | * For disks, this implies that there is no | |
823 | * logical disk configured at sdev->lun, but there | |
824 | * is a target id responding. | |
825 | */ | |
826 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO | |
827 | "scsi scan: peripheral qualifier of 3," | |
828 | " no device added\n")); | |
829 | res = SCSI_SCAN_TARGET_PRESENT; | |
830 | goto out_free_result; | |
831 | } | |
832 | ||
833 | res = scsi_add_lun(sdev, result, &bflags); | |
834 | if (res == SCSI_SCAN_LUN_PRESENT) { | |
835 | if (bflags & BLIST_KEY) { | |
836 | sdev->lockable = 0; | |
837 | scsi_unlock_floptical(sreq, result); | |
838 | } | |
839 | if (bflagsp) | |
840 | *bflagsp = bflags; | |
841 | } | |
842 | ||
843 | out_free_result: | |
844 | kfree(result); | |
845 | out_free_sreq: | |
846 | scsi_release_request(sreq); | |
847 | out_free_sdev: | |
848 | if (res == SCSI_SCAN_LUN_PRESENT) { | |
849 | if (sdevp) { | |
850 | scsi_device_get(sdev); | |
851 | *sdevp = sdev; | |
852 | } | |
853 | } else { | |
854 | if (sdev->host->hostt->slave_destroy) | |
855 | sdev->host->hostt->slave_destroy(sdev); | |
856 | transport_destroy_device(&sdev->sdev_gendev); | |
857 | put_device(&sdev->sdev_gendev); | |
858 | } | |
859 | out: | |
860 | return res; | |
861 | } | |
862 | ||
863 | /** | |
864 | * scsi_sequential_lun_scan - sequentially scan a SCSI target | |
865 | * @starget: pointer to target structure to scan | |
866 | * @bflags: black/white list flag for LUN 0 | |
867 | * @lun0_res: result of scanning LUN 0 | |
868 | * | |
869 | * Description: | |
870 | * Generally, scan from LUN 1 (LUN 0 is assumed to already have been | |
871 | * scanned) to some maximum lun until a LUN is found with no device | |
872 | * attached. Use the bflags to figure out any oddities. | |
873 | * | |
874 | * Modifies sdevscan->lun. | |
875 | **/ | |
876 | static void scsi_sequential_lun_scan(struct scsi_target *starget, | |
877 | int bflags, int lun0_res, int scsi_level, | |
878 | int rescan) | |
879 | { | |
880 | unsigned int sparse_lun, lun, max_dev_lun; | |
881 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
882 | ||
883 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of" | |
884 | "%s\n", starget->dev.bus_id)); | |
885 | ||
886 | max_dev_lun = min(max_scsi_luns, shost->max_lun); | |
887 | /* | |
888 | * If this device is known to support sparse multiple units, | |
889 | * override the other settings, and scan all of them. Normally, | |
890 | * SCSI-3 devices should be scanned via the REPORT LUNS. | |
891 | */ | |
892 | if (bflags & BLIST_SPARSELUN) { | |
893 | max_dev_lun = shost->max_lun; | |
894 | sparse_lun = 1; | |
895 | } else | |
896 | sparse_lun = 0; | |
897 | ||
898 | /* | |
899 | * If not sparse lun and no device attached at LUN 0 do not scan | |
900 | * any further. | |
901 | */ | |
902 | if (!sparse_lun && (lun0_res != SCSI_SCAN_LUN_PRESENT)) | |
903 | return; | |
904 | ||
905 | /* | |
906 | * If less than SCSI_1_CSS, and no special lun scaning, stop | |
907 | * scanning; this matches 2.4 behaviour, but could just be a bug | |
908 | * (to continue scanning a SCSI_1_CSS device). | |
909 | * | |
910 | * This test is broken. We might not have any device on lun0 for | |
911 | * a sparselun device, and if that's the case then how would we | |
912 | * know the real scsi_level, eh? It might make sense to just not | |
913 | * scan any SCSI_1 device for non-0 luns, but that check would best | |
914 | * go into scsi_alloc_sdev() and just have it return null when asked | |
915 | * to alloc an sdev for lun > 0 on an already found SCSI_1 device. | |
916 | * | |
917 | if ((sdevscan->scsi_level < SCSI_1_CCS) && | |
918 | ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN)) | |
919 | == 0)) | |
920 | return; | |
921 | */ | |
922 | /* | |
923 | * If this device is known to support multiple units, override | |
924 | * the other settings, and scan all of them. | |
925 | */ | |
926 | if (bflags & BLIST_FORCELUN) | |
927 | max_dev_lun = shost->max_lun; | |
928 | /* | |
929 | * REGAL CDC-4X: avoid hang after LUN 4 | |
930 | */ | |
931 | if (bflags & BLIST_MAX5LUN) | |
932 | max_dev_lun = min(5U, max_dev_lun); | |
933 | /* | |
934 | * Do not scan SCSI-2 or lower device past LUN 7, unless | |
935 | * BLIST_LARGELUN. | |
936 | */ | |
937 | if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN)) | |
938 | max_dev_lun = min(8U, max_dev_lun); | |
939 | ||
940 | /* | |
941 | * We have already scanned LUN 0, so start at LUN 1. Keep scanning | |
942 | * until we reach the max, or no LUN is found and we are not | |
943 | * sparse_lun. | |
944 | */ | |
945 | for (lun = 1; lun < max_dev_lun; ++lun) | |
946 | if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, | |
947 | NULL) != SCSI_SCAN_LUN_PRESENT) && | |
948 | !sparse_lun) | |
949 | return; | |
950 | } | |
951 | ||
952 | /** | |
953 | * scsilun_to_int: convert a scsi_lun to an int | |
954 | * @scsilun: struct scsi_lun to be converted. | |
955 | * | |
956 | * Description: | |
957 | * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered | |
958 | * integer, and return the result. The caller must check for | |
959 | * truncation before using this function. | |
960 | * | |
961 | * Notes: | |
962 | * The struct scsi_lun is assumed to be four levels, with each level | |
963 | * effectively containing a SCSI byte-ordered (big endian) short; the | |
964 | * addressing bits of each level are ignored (the highest two bits). | |
965 | * For a description of the LUN format, post SCSI-3 see the SCSI | |
966 | * Architecture Model, for SCSI-3 see the SCSI Controller Commands. | |
967 | * | |
968 | * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns | |
969 | * the integer: 0x0b030a04 | |
970 | **/ | |
971 | static int scsilun_to_int(struct scsi_lun *scsilun) | |
972 | { | |
973 | int i; | |
974 | unsigned int lun; | |
975 | ||
976 | lun = 0; | |
977 | for (i = 0; i < sizeof(lun); i += 2) | |
978 | lun = lun | (((scsilun->scsi_lun[i] << 8) | | |
979 | scsilun->scsi_lun[i + 1]) << (i * 8)); | |
980 | return lun; | |
981 | } | |
982 | ||
983 | /** | |
984 | * scsi_report_lun_scan - Scan using SCSI REPORT LUN results | |
985 | * @sdevscan: scan the host, channel, and id of this Scsi_Device | |
986 | * | |
987 | * Description: | |
988 | * If @sdevscan is for a SCSI-3 or up device, send a REPORT LUN | |
989 | * command, and scan the resulting list of LUNs by calling | |
990 | * scsi_probe_and_add_lun. | |
991 | * | |
992 | * Modifies sdevscan->lun. | |
993 | * | |
994 | * Return: | |
995 | * 0: scan completed (or no memory, so further scanning is futile) | |
996 | * 1: no report lun scan, or not configured | |
997 | **/ | |
998 | static int scsi_report_lun_scan(struct scsi_device *sdev, int bflags, | |
999 | int rescan) | |
1000 | { | |
1001 | char devname[64]; | |
1002 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
1003 | unsigned int length; | |
1004 | unsigned int lun; | |
1005 | unsigned int num_luns; | |
1006 | unsigned int retries; | |
1007 | struct scsi_lun *lunp, *lun_data; | |
1008 | struct scsi_request *sreq; | |
1009 | u8 *data; | |
1010 | struct scsi_sense_hdr sshdr; | |
1011 | struct scsi_target *starget = scsi_target(sdev); | |
1012 | ||
1013 | /* | |
1014 | * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set. | |
1015 | * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does | |
1016 | * support more than 8 LUNs. | |
1017 | */ | |
1018 | if ((bflags & BLIST_NOREPORTLUN) || | |
1019 | sdev->scsi_level < SCSI_2 || | |
1020 | (sdev->scsi_level < SCSI_3 && | |
1021 | (!(bflags & BLIST_REPORTLUN2) || sdev->host->max_lun <= 8)) ) | |
1022 | return 1; | |
1023 | if (bflags & BLIST_NOLUN) | |
1024 | return 0; | |
1025 | ||
1026 | sreq = scsi_allocate_request(sdev, GFP_ATOMIC); | |
1027 | if (!sreq) | |
1028 | goto out; | |
1029 | ||
1030 | sprintf(devname, "host %d channel %d id %d", | |
1031 | sdev->host->host_no, sdev->channel, sdev->id); | |
1032 | ||
1033 | /* | |
1034 | * Allocate enough to hold the header (the same size as one scsi_lun) | |
1035 | * plus the max number of luns we are requesting. | |
1036 | * | |
1037 | * Reallocating and trying again (with the exact amount we need) | |
1038 | * would be nice, but then we need to somehow limit the size | |
1039 | * allocated based on the available memory and the limits of | |
1040 | * kmalloc - we don't want a kmalloc() failure of a huge value to | |
1041 | * prevent us from finding any LUNs on this target. | |
1042 | */ | |
1043 | length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun); | |
1044 | lun_data = kmalloc(length, GFP_ATOMIC | | |
1045 | (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0)); | |
1046 | if (!lun_data) | |
1047 | goto out_release_request; | |
1048 | ||
1049 | scsi_cmd[0] = REPORT_LUNS; | |
1050 | ||
1051 | /* | |
1052 | * bytes 1 - 5: reserved, set to zero. | |
1053 | */ | |
1054 | memset(&scsi_cmd[1], 0, 5); | |
1055 | ||
1056 | /* | |
1057 | * bytes 6 - 9: length of the command. | |
1058 | */ | |
1059 | scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff; | |
1060 | scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff; | |
1061 | scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff; | |
1062 | scsi_cmd[9] = (unsigned char) length & 0xff; | |
1063 | ||
1064 | scsi_cmd[10] = 0; /* reserved */ | |
1065 | scsi_cmd[11] = 0; /* control */ | |
1066 | sreq->sr_cmd_len = 0; | |
1067 | sreq->sr_data_direction = DMA_FROM_DEVICE; | |
1068 | ||
1069 | /* | |
1070 | * We can get a UNIT ATTENTION, for example a power on/reset, so | |
1071 | * retry a few times (like sd.c does for TEST UNIT READY). | |
1072 | * Experience shows some combinations of adapter/devices get at | |
1073 | * least two power on/resets. | |
1074 | * | |
1075 | * Illegal requests (for devices that do not support REPORT LUNS) | |
1076 | * should come through as a check condition, and will not generate | |
1077 | * a retry. | |
1078 | */ | |
1079 | for (retries = 0; retries < 3; retries++) { | |
1080 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending" | |
1081 | " REPORT LUNS to %s (try %d)\n", devname, | |
1082 | retries)); | |
1083 | scsi_wait_req(sreq, scsi_cmd, lun_data, length, | |
1084 | SCSI_TIMEOUT + 4*HZ, 3); | |
1085 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS" | |
1086 | " %s (try %d) result 0x%x\n", sreq->sr_result | |
1087 | ? "failed" : "successful", retries, | |
1088 | sreq->sr_result)); | |
1089 | if (sreq->sr_result == 0) | |
1090 | break; | |
1091 | else if (scsi_request_normalize_sense(sreq, &sshdr)) { | |
1092 | if (sshdr.sense_key != UNIT_ATTENTION) | |
1093 | break; | |
1094 | } | |
1095 | } | |
1096 | ||
1097 | if (sreq->sr_result) { | |
1098 | /* | |
1099 | * The device probably does not support a REPORT LUN command | |
1100 | */ | |
1101 | kfree(lun_data); | |
1102 | scsi_release_request(sreq); | |
1103 | return 1; | |
1104 | } | |
1105 | scsi_release_request(sreq); | |
1106 | ||
1107 | /* | |
1108 | * Get the length from the first four bytes of lun_data. | |
1109 | */ | |
1110 | data = (u8 *) lun_data->scsi_lun; | |
1111 | length = ((data[0] << 24) | (data[1] << 16) | | |
1112 | (data[2] << 8) | (data[3] << 0)); | |
1113 | ||
1114 | num_luns = (length / sizeof(struct scsi_lun)); | |
1115 | if (num_luns > max_scsi_report_luns) { | |
1116 | printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)" | |
1117 | " of %d luns reported, try increasing" | |
1118 | " max_scsi_report_luns.\n", devname, | |
1119 | max_scsi_report_luns, num_luns); | |
1120 | num_luns = max_scsi_report_luns; | |
1121 | } | |
1122 | ||
1123 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUN scan of" | |
1124 | " host %d channel %d id %d\n", sdev->host->host_no, | |
1125 | sdev->channel, sdev->id)); | |
1126 | ||
1127 | /* | |
1128 | * Scan the luns in lun_data. The entry at offset 0 is really | |
1129 | * the header, so start at 1 and go up to and including num_luns. | |
1130 | */ | |
1131 | for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) { | |
1132 | lun = scsilun_to_int(lunp); | |
1133 | ||
1134 | /* | |
1135 | * Check if the unused part of lunp is non-zero, and so | |
1136 | * does not fit in lun. | |
1137 | */ | |
1138 | if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) { | |
1139 | int i; | |
1140 | ||
1141 | /* | |
1142 | * Output an error displaying the LUN in byte order, | |
1143 | * this differs from what linux would print for the | |
1144 | * integer LUN value. | |
1145 | */ | |
1146 | printk(KERN_WARNING "scsi: %s lun 0x", devname); | |
1147 | data = (char *)lunp->scsi_lun; | |
1148 | for (i = 0; i < sizeof(struct scsi_lun); i++) | |
1149 | printk("%02x", data[i]); | |
1150 | printk(" has a LUN larger than currently supported.\n"); | |
1151 | } else if (lun == 0) { | |
1152 | /* | |
1153 | * LUN 0 has already been scanned. | |
1154 | */ | |
1155 | } else if (lun > sdev->host->max_lun) { | |
1156 | printk(KERN_WARNING "scsi: %s lun%d has a LUN larger" | |
1157 | " than allowed by the host adapter\n", | |
1158 | devname, lun); | |
1159 | } else { | |
1160 | int res; | |
1161 | ||
1162 | res = scsi_probe_and_add_lun(starget, | |
1163 | lun, NULL, NULL, rescan, NULL); | |
1164 | if (res == SCSI_SCAN_NO_RESPONSE) { | |
1165 | /* | |
1166 | * Got some results, but now none, abort. | |
1167 | */ | |
1168 | printk(KERN_ERR "scsi: Unexpected response" | |
1169 | " from %s lun %d while scanning, scan" | |
1170 | " aborted\n", devname, lun); | |
1171 | break; | |
1172 | } | |
1173 | } | |
1174 | } | |
1175 | ||
1176 | kfree(lun_data); | |
1177 | return 0; | |
1178 | ||
1179 | out_release_request: | |
1180 | scsi_release_request(sreq); | |
1181 | out: | |
1182 | /* | |
1183 | * We are out of memory, don't try scanning any further. | |
1184 | */ | |
1185 | printk(ALLOC_FAILURE_MSG, __FUNCTION__); | |
1186 | return 0; | |
1187 | } | |
1188 | ||
1189 | struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel, | |
1190 | uint id, uint lun, void *hostdata) | |
1191 | { | |
1192 | struct scsi_device *sdev; | |
1193 | struct device *parent = &shost->shost_gendev; | |
1194 | int res; | |
1195 | struct scsi_target *starget = scsi_alloc_target(parent, channel, id); | |
1196 | ||
1197 | if (!starget) | |
1198 | return ERR_PTR(-ENOMEM); | |
1199 | ||
1200 | down(&shost->scan_mutex); | |
1201 | res = scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata); | |
1202 | if (res != SCSI_SCAN_LUN_PRESENT) | |
1203 | sdev = ERR_PTR(-ENODEV); | |
1204 | up(&shost->scan_mutex); | |
1205 | scsi_target_reap(starget); | |
1206 | put_device(&starget->dev); | |
1207 | ||
1208 | return sdev; | |
1209 | } | |
1210 | EXPORT_SYMBOL(__scsi_add_device); | |
1211 | ||
1212 | void scsi_rescan_device(struct device *dev) | |
1213 | { | |
1214 | struct scsi_driver *drv; | |
1215 | ||
1216 | if (!dev->driver) | |
1217 | return; | |
1218 | ||
1219 | drv = to_scsi_driver(dev->driver); | |
1220 | if (try_module_get(drv->owner)) { | |
1221 | if (drv->rescan) | |
1222 | drv->rescan(dev); | |
1223 | module_put(drv->owner); | |
1224 | } | |
1225 | } | |
1226 | EXPORT_SYMBOL(scsi_rescan_device); | |
1227 | ||
1228 | /** | |
1229 | * scsi_scan_target - scan a target id, possibly including all LUNs on the | |
1230 | * target. | |
1231 | * @sdevsca: Scsi_Device handle for scanning | |
1232 | * @shost: host to scan | |
1233 | * @channel: channel to scan | |
1234 | * @id: target id to scan | |
1235 | * | |
1236 | * Description: | |
1237 | * Scan the target id on @shost, @channel, and @id. Scan at least LUN | |
1238 | * 0, and possibly all LUNs on the target id. | |
1239 | * | |
1240 | * Use the pre-allocated @sdevscan as a handle for the scanning. This | |
1241 | * function sets sdevscan->host, sdevscan->id and sdevscan->lun; the | |
1242 | * scanning functions modify sdevscan->lun. | |
1243 | * | |
1244 | * First try a REPORT LUN scan, if that does not scan the target, do a | |
1245 | * sequential scan of LUNs on the target id. | |
1246 | **/ | |
1247 | void scsi_scan_target(struct device *parent, unsigned int channel, | |
1248 | unsigned int id, unsigned int lun, int rescan) | |
1249 | { | |
1250 | struct Scsi_Host *shost = dev_to_shost(parent); | |
1251 | int bflags = 0; | |
1252 | int res; | |
1253 | struct scsi_device *sdev = NULL; | |
1254 | struct scsi_target *starget; | |
1255 | ||
1256 | if (shost->this_id == id) | |
1257 | /* | |
1258 | * Don't scan the host adapter | |
1259 | */ | |
1260 | return; | |
1261 | ||
1262 | ||
1263 | starget = scsi_alloc_target(parent, channel, id); | |
1264 | ||
1265 | if (!starget) | |
1266 | return; | |
1267 | ||
1268 | get_device(&starget->dev); | |
1269 | if (lun != SCAN_WILD_CARD) { | |
1270 | /* | |
1271 | * Scan for a specific host/chan/id/lun. | |
1272 | */ | |
1273 | scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL); | |
1274 | goto out_reap; | |
1275 | } | |
1276 | ||
1277 | /* | |
1278 | * Scan LUN 0, if there is some response, scan further. Ideally, we | |
1279 | * would not configure LUN 0 until all LUNs are scanned. | |
1280 | */ | |
1281 | res = scsi_probe_and_add_lun(starget, 0, &bflags, &sdev, rescan, NULL); | |
1282 | if (res == SCSI_SCAN_LUN_PRESENT) { | |
1283 | if (scsi_report_lun_scan(sdev, bflags, rescan) != 0) | |
1284 | /* | |
1285 | * The REPORT LUN did not scan the target, | |
1286 | * do a sequential scan. | |
1287 | */ | |
1288 | scsi_sequential_lun_scan(starget, bflags, | |
1289 | res, sdev->scsi_level, rescan); | |
1290 | } else if (res == SCSI_SCAN_TARGET_PRESENT) { | |
1291 | /* | |
1292 | * There's a target here, but lun 0 is offline so we | |
1293 | * can't use the report_lun scan. Fall back to a | |
1294 | * sequential lun scan with a bflags of SPARSELUN and | |
1295 | * a default scsi level of SCSI_2 | |
1296 | */ | |
1297 | scsi_sequential_lun_scan(starget, BLIST_SPARSELUN, | |
1298 | SCSI_SCAN_TARGET_PRESENT, SCSI_2, rescan); | |
1299 | } | |
1300 | if (sdev) | |
1301 | scsi_device_put(sdev); | |
1302 | ||
1303 | out_reap: | |
1304 | /* now determine if the target has any children at all | |
1305 | * and if not, nuke it */ | |
1306 | scsi_target_reap(starget); | |
1307 | ||
1308 | put_device(&starget->dev); | |
1309 | } | |
1310 | EXPORT_SYMBOL(scsi_scan_target); | |
1311 | ||
1312 | static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel, | |
1313 | unsigned int id, unsigned int lun, int rescan) | |
1314 | { | |
1315 | uint order_id; | |
1316 | ||
1317 | if (id == SCAN_WILD_CARD) | |
1318 | for (id = 0; id < shost->max_id; ++id) { | |
1319 | /* | |
1320 | * XXX adapter drivers when possible (FCP, iSCSI) | |
1321 | * could modify max_id to match the current max, | |
1322 | * not the absolute max. | |
1323 | * | |
1324 | * XXX add a shost id iterator, so for example, | |
1325 | * the FC ID can be the same as a target id | |
1326 | * without a huge overhead of sparse id's. | |
1327 | */ | |
1328 | if (shost->reverse_ordering) | |
1329 | /* | |
1330 | * Scan from high to low id. | |
1331 | */ | |
1332 | order_id = shost->max_id - id - 1; | |
1333 | else | |
1334 | order_id = id; | |
1335 | scsi_scan_target(&shost->shost_gendev, channel, order_id, lun, rescan); | |
1336 | } | |
1337 | else | |
1338 | scsi_scan_target(&shost->shost_gendev, channel, id, lun, rescan); | |
1339 | } | |
1340 | ||
1341 | int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel, | |
1342 | unsigned int id, unsigned int lun, int rescan) | |
1343 | { | |
1344 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "%s: <%u:%u:%u:%u>\n", | |
1345 | __FUNCTION__, shost->host_no, channel, id, lun)); | |
1346 | ||
1347 | if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) || | |
1348 | ((id != SCAN_WILD_CARD) && (id > shost->max_id)) || | |
1349 | ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun))) | |
1350 | return -EINVAL; | |
1351 | ||
1352 | down(&shost->scan_mutex); | |
1353 | if (channel == SCAN_WILD_CARD) | |
1354 | for (channel = 0; channel <= shost->max_channel; channel++) | |
1355 | scsi_scan_channel(shost, channel, id, lun, rescan); | |
1356 | else | |
1357 | scsi_scan_channel(shost, channel, id, lun, rescan); | |
1358 | up(&shost->scan_mutex); | |
1359 | ||
1360 | return 0; | |
1361 | } | |
1362 | ||
1363 | /** | |
1364 | * scsi_scan_host - scan the given adapter | |
1365 | * @shost: adapter to scan | |
1366 | **/ | |
1367 | void scsi_scan_host(struct Scsi_Host *shost) | |
1368 | { | |
1369 | scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD, | |
1370 | SCAN_WILD_CARD, 0); | |
1371 | } | |
1372 | EXPORT_SYMBOL(scsi_scan_host); | |
1373 | ||
1374 | /** | |
1375 | * scsi_scan_single_target - scan the given SCSI target | |
1376 | * @shost: adapter to scan | |
1377 | * @chan: channel to scan | |
1378 | * @id: target id to scan | |
1379 | **/ | |
1380 | void scsi_scan_single_target(struct Scsi_Host *shost, | |
1381 | unsigned int chan, unsigned int id) | |
1382 | { | |
1383 | scsi_scan_host_selected(shost, chan, id, SCAN_WILD_CARD, 1); | |
1384 | } | |
1385 | EXPORT_SYMBOL(scsi_scan_single_target); | |
1386 | ||
1387 | void scsi_forget_host(struct Scsi_Host *shost) | |
1388 | { | |
1389 | struct scsi_target *starget, *tmp; | |
1390 | unsigned long flags; | |
1391 | ||
1392 | /* | |
1393 | * Ok, this look a bit strange. We always look for the first device | |
1394 | * on the list as scsi_remove_device removes them from it - thus we | |
1395 | * also have to release the lock. | |
1396 | * We don't need to get another reference to the device before | |
1397 | * releasing the lock as we already own the reference from | |
1398 | * scsi_register_device that's release in scsi_remove_device. And | |
1399 | * after that we don't look at sdev anymore. | |
1400 | */ | |
1401 | spin_lock_irqsave(shost->host_lock, flags); | |
1402 | list_for_each_entry_safe(starget, tmp, &shost->__targets, siblings) { | |
1403 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1404 | scsi_remove_target(&starget->dev); | |
1405 | spin_lock_irqsave(shost->host_lock, flags); | |
1406 | } | |
1407 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1408 | } | |
1409 | ||
1410 | /* | |
1411 | * Function: scsi_get_host_dev() | |
1412 | * | |
1413 | * Purpose: Create a Scsi_Device that points to the host adapter itself. | |
1414 | * | |
1415 | * Arguments: SHpnt - Host that needs a Scsi_Device | |
1416 | * | |
1417 | * Lock status: None assumed. | |
1418 | * | |
1419 | * Returns: The Scsi_Device or NULL | |
1420 | * | |
1421 | * Notes: | |
1422 | * Attach a single Scsi_Device to the Scsi_Host - this should | |
1423 | * be made to look like a "pseudo-device" that points to the | |
1424 | * HA itself. | |
1425 | * | |
1426 | * Note - this device is not accessible from any high-level | |
1427 | * drivers (including generics), which is probably not | |
1428 | * optimal. We can add hooks later to attach | |
1429 | */ | |
1430 | struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost) | |
1431 | { | |
1432 | struct scsi_device *sdev; | |
1433 | struct scsi_target *starget; | |
1434 | ||
1435 | starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id); | |
1436 | if (!starget) | |
1437 | return NULL; | |
1438 | ||
1439 | sdev = scsi_alloc_sdev(starget, 0, NULL); | |
1440 | if (sdev) { | |
1441 | sdev->sdev_gendev.parent = get_device(&starget->dev); | |
1442 | sdev->borken = 0; | |
1443 | } | |
1444 | put_device(&starget->dev); | |
1445 | return sdev; | |
1446 | } | |
1447 | EXPORT_SYMBOL(scsi_get_host_dev); | |
1448 | ||
1449 | /* | |
1450 | * Function: scsi_free_host_dev() | |
1451 | * | |
1452 | * Purpose: Free a scsi_device that points to the host adapter itself. | |
1453 | * | |
1454 | * Arguments: SHpnt - Host that needs a Scsi_Device | |
1455 | * | |
1456 | * Lock status: None assumed. | |
1457 | * | |
1458 | * Returns: Nothing | |
1459 | * | |
1460 | * Notes: | |
1461 | */ | |
1462 | void scsi_free_host_dev(struct scsi_device *sdev) | |
1463 | { | |
1464 | BUG_ON(sdev->id != sdev->host->this_id); | |
1465 | ||
1466 | if (sdev->host->hostt->slave_destroy) | |
1467 | sdev->host->hostt->slave_destroy(sdev); | |
1468 | transport_destroy_device(&sdev->sdev_gendev); | |
1469 | put_device(&sdev->sdev_gendev); | |
1470 | } | |
1471 | EXPORT_SYMBOL(scsi_free_host_dev); | |
1472 |