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1da177e4 LT |
1 | /* |
2 | * scsi_scan.c | |
3 | * | |
4 | * Copyright (C) 2000 Eric Youngdale, | |
5 | * Copyright (C) 2002 Patrick Mansfield | |
6 | * | |
7 | * The general scanning/probing algorithm is as follows, exceptions are | |
8 | * made to it depending on device specific flags, compilation options, and | |
9 | * global variable (boot or module load time) settings. | |
10 | * | |
11 | * A specific LUN is scanned via an INQUIRY command; if the LUN has a | |
f64a181d | 12 | * device attached, a scsi_device is allocated and setup for it. |
1da177e4 LT |
13 | * |
14 | * For every id of every channel on the given host: | |
15 | * | |
16 | * Scan LUN 0; if the target responds to LUN 0 (even if there is no | |
17 | * device or storage attached to LUN 0): | |
18 | * | |
19 | * If LUN 0 has a device attached, allocate and setup a | |
f64a181d | 20 | * scsi_device for it. |
1da177e4 LT |
21 | * |
22 | * If target is SCSI-3 or up, issue a REPORT LUN, and scan | |
23 | * all of the LUNs returned by the REPORT LUN; else, | |
24 | * sequentially scan LUNs up until some maximum is reached, | |
25 | * or a LUN is seen that cannot have a device attached to it. | |
26 | */ | |
27 | ||
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 | ||
0ad78200 | 77 | static const char *scsi_null_device_strs = "nullnullnullnull"; |
1da177e4 LT |
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 | |
39216033 | 114 | * @sdev: scsi device to send command to |
1da177e4 LT |
115 | * @result: area to store the result of the MODE SENSE |
116 | * | |
117 | * Description: | |
39216033 | 118 | * Send a vendor specific MODE SENSE (not a MODE SELECT) command. |
1da177e4 LT |
119 | * Called for BLIST_KEY devices. |
120 | **/ | |
39216033 | 121 | static void scsi_unlock_floptical(struct scsi_device *sdev, |
1da177e4 LT |
122 | unsigned char *result) |
123 | { | |
124 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
125 | ||
126 | printk(KERN_NOTICE "scsi: unlocking floptical drive\n"); | |
127 | scsi_cmd[0] = MODE_SENSE; | |
128 | scsi_cmd[1] = 0; | |
129 | scsi_cmd[2] = 0x2e; | |
130 | scsi_cmd[3] = 0; | |
39216033 | 131 | scsi_cmd[4] = 0x2a; /* size */ |
1da177e4 | 132 | scsi_cmd[5] = 0; |
39216033 JB |
133 | scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL, |
134 | SCSI_TIMEOUT, 3); | |
1da177e4 LT |
135 | } |
136 | ||
137 | /** | |
138 | * print_inquiry - printk the inquiry information | |
139 | * @inq_result: printk this SCSI INQUIRY | |
140 | * | |
141 | * Description: | |
142 | * printk the vendor, model, and other information found in the | |
143 | * INQUIRY data in @inq_result. | |
144 | * | |
145 | * Notes: | |
146 | * Remove this, and replace with a hotplug event that logs any | |
147 | * relevant information. | |
148 | **/ | |
149 | static void print_inquiry(unsigned char *inq_result) | |
150 | { | |
151 | int i; | |
152 | ||
153 | printk(KERN_NOTICE " Vendor: "); | |
154 | for (i = 8; i < 16; i++) | |
155 | if (inq_result[i] >= 0x20 && i < inq_result[4] + 5) | |
156 | printk("%c", inq_result[i]); | |
157 | else | |
158 | printk(" "); | |
159 | ||
160 | printk(" Model: "); | |
161 | for (i = 16; i < 32; i++) | |
162 | if (inq_result[i] >= 0x20 && i < inq_result[4] + 5) | |
163 | printk("%c", inq_result[i]); | |
164 | else | |
165 | printk(" "); | |
166 | ||
167 | printk(" Rev: "); | |
168 | for (i = 32; i < 36; i++) | |
169 | if (inq_result[i] >= 0x20 && i < inq_result[4] + 5) | |
170 | printk("%c", inq_result[i]); | |
171 | else | |
172 | printk(" "); | |
173 | ||
174 | printk("\n"); | |
175 | ||
176 | i = inq_result[0] & 0x1f; | |
177 | ||
178 | printk(KERN_NOTICE " Type: %s ", | |
179 | i < | |
180 | MAX_SCSI_DEVICE_CODE ? scsi_device_types[i] : | |
181 | "Unknown "); | |
182 | printk(" ANSI SCSI revision: %02x", | |
183 | inq_result[2] & 0x07); | |
184 | if ((inq_result[2] & 0x07) == 1 && (inq_result[3] & 0x0f) == 1) | |
185 | printk(" CCS\n"); | |
186 | else | |
187 | printk("\n"); | |
188 | } | |
189 | ||
190 | /** | |
191 | * scsi_alloc_sdev - allocate and setup a scsi_Device | |
192 | * | |
193 | * Description: | |
194 | * Allocate, initialize for io, and return a pointer to a scsi_Device. | |
195 | * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and | |
196 | * adds scsi_Device to the appropriate list. | |
197 | * | |
198 | * Return value: | |
199 | * scsi_Device pointer, or NULL on failure. | |
200 | **/ | |
201 | static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, | |
202 | unsigned int lun, void *hostdata) | |
203 | { | |
204 | struct scsi_device *sdev; | |
205 | int display_failure_msg = 1, ret; | |
206 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
207 | ||
24669f75 | 208 | sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size, |
1da177e4 LT |
209 | GFP_ATOMIC); |
210 | if (!sdev) | |
211 | goto out; | |
212 | ||
1da177e4 LT |
213 | sdev->vendor = scsi_null_device_strs; |
214 | sdev->model = scsi_null_device_strs; | |
215 | sdev->rev = scsi_null_device_strs; | |
216 | sdev->host = shost; | |
217 | sdev->id = starget->id; | |
218 | sdev->lun = lun; | |
219 | sdev->channel = starget->channel; | |
220 | sdev->sdev_state = SDEV_CREATED; | |
221 | INIT_LIST_HEAD(&sdev->siblings); | |
222 | INIT_LIST_HEAD(&sdev->same_target_siblings); | |
223 | INIT_LIST_HEAD(&sdev->cmd_list); | |
224 | INIT_LIST_HEAD(&sdev->starved_entry); | |
225 | spin_lock_init(&sdev->list_lock); | |
226 | ||
227 | sdev->sdev_gendev.parent = get_device(&starget->dev); | |
228 | sdev->sdev_target = starget; | |
229 | ||
230 | /* usually NULL and set by ->slave_alloc instead */ | |
231 | sdev->hostdata = hostdata; | |
232 | ||
233 | /* if the device needs this changing, it may do so in the | |
234 | * slave_configure function */ | |
235 | sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED; | |
236 | ||
237 | /* | |
238 | * Some low level driver could use device->type | |
239 | */ | |
240 | sdev->type = -1; | |
241 | ||
242 | /* | |
243 | * Assume that the device will have handshaking problems, | |
244 | * and then fix this field later if it turns out it | |
245 | * doesn't | |
246 | */ | |
247 | sdev->borken = 1; | |
248 | ||
1da177e4 LT |
249 | sdev->request_queue = scsi_alloc_queue(sdev); |
250 | if (!sdev->request_queue) { | |
251 | /* release fn is set up in scsi_sysfs_device_initialise, so | |
252 | * have to free and put manually here */ | |
253 | put_device(&starget->dev); | |
254 | goto out; | |
255 | } | |
256 | ||
257 | sdev->request_queue->queuedata = sdev; | |
258 | scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun); | |
259 | ||
260 | scsi_sysfs_device_initialize(sdev); | |
261 | ||
262 | if (shost->hostt->slave_alloc) { | |
263 | ret = shost->hostt->slave_alloc(sdev); | |
264 | if (ret) { | |
265 | /* | |
266 | * if LLDD reports slave not present, don't clutter | |
267 | * console with alloc failure messages | |
1da177e4 LT |
268 | */ |
269 | if (ret == -ENXIO) | |
270 | display_failure_msg = 0; | |
271 | goto out_device_destroy; | |
272 | } | |
273 | } | |
274 | ||
275 | return sdev; | |
276 | ||
277 | out_device_destroy: | |
278 | transport_destroy_device(&sdev->sdev_gendev); | |
1da177e4 LT |
279 | put_device(&sdev->sdev_gendev); |
280 | out: | |
281 | if (display_failure_msg) | |
282 | printk(ALLOC_FAILURE_MSG, __FUNCTION__); | |
283 | return NULL; | |
284 | } | |
285 | ||
286 | static void scsi_target_dev_release(struct device *dev) | |
287 | { | |
288 | struct device *parent = dev->parent; | |
289 | struct scsi_target *starget = to_scsi_target(dev); | |
a283bd37 JB |
290 | struct Scsi_Host *shost = dev_to_shost(parent); |
291 | ||
292 | if (shost->hostt->target_destroy) | |
293 | shost->hostt->target_destroy(starget); | |
1da177e4 LT |
294 | kfree(starget); |
295 | put_device(parent); | |
296 | } | |
297 | ||
298 | int scsi_is_target_device(const struct device *dev) | |
299 | { | |
300 | return dev->release == scsi_target_dev_release; | |
301 | } | |
302 | EXPORT_SYMBOL(scsi_is_target_device); | |
303 | ||
304 | static struct scsi_target *__scsi_find_target(struct device *parent, | |
305 | int channel, uint id) | |
306 | { | |
307 | struct scsi_target *starget, *found_starget = NULL; | |
308 | struct Scsi_Host *shost = dev_to_shost(parent); | |
309 | /* | |
310 | * Search for an existing target for this sdev. | |
311 | */ | |
312 | list_for_each_entry(starget, &shost->__targets, siblings) { | |
313 | if (starget->id == id && | |
314 | starget->channel == channel) { | |
315 | found_starget = starget; | |
316 | break; | |
317 | } | |
318 | } | |
319 | if (found_starget) | |
320 | get_device(&found_starget->dev); | |
321 | ||
322 | return found_starget; | |
323 | } | |
324 | ||
325 | static struct scsi_target *scsi_alloc_target(struct device *parent, | |
326 | int channel, uint id) | |
327 | { | |
328 | struct Scsi_Host *shost = dev_to_shost(parent); | |
329 | struct device *dev = NULL; | |
330 | unsigned long flags; | |
331 | const int size = sizeof(struct scsi_target) | |
332 | + shost->transportt->target_size; | |
5c44cd2a | 333 | struct scsi_target *starget; |
1da177e4 LT |
334 | struct scsi_target *found_target; |
335 | ||
24669f75 | 336 | starget = kzalloc(size, GFP_KERNEL); |
1da177e4 LT |
337 | if (!starget) { |
338 | printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__); | |
339 | return NULL; | |
340 | } | |
1da177e4 LT |
341 | dev = &starget->dev; |
342 | device_initialize(dev); | |
343 | starget->reap_ref = 1; | |
344 | dev->parent = get_device(parent); | |
345 | dev->release = scsi_target_dev_release; | |
346 | sprintf(dev->bus_id, "target%d:%d:%d", | |
347 | shost->host_no, channel, id); | |
348 | starget->id = id; | |
349 | starget->channel = channel; | |
350 | INIT_LIST_HEAD(&starget->siblings); | |
351 | INIT_LIST_HEAD(&starget->devices); | |
352 | spin_lock_irqsave(shost->host_lock, flags); | |
353 | ||
354 | found_target = __scsi_find_target(parent, channel, id); | |
355 | if (found_target) | |
356 | goto found; | |
357 | ||
358 | list_add_tail(&starget->siblings, &shost->__targets); | |
359 | spin_unlock_irqrestore(shost->host_lock, flags); | |
360 | /* allocate and add */ | |
a283bd37 JB |
361 | transport_setup_device(dev); |
362 | device_add(dev); | |
363 | transport_add_device(dev); | |
364 | if (shost->hostt->target_alloc) { | |
365 | int error = shost->hostt->target_alloc(starget); | |
366 | ||
367 | if(error) { | |
368 | dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error); | |
369 | /* don't want scsi_target_reap to do the final | |
370 | * put because it will be under the host lock */ | |
371 | get_device(dev); | |
372 | scsi_target_reap(starget); | |
373 | put_device(dev); | |
374 | return NULL; | |
375 | } | |
376 | } | |
377 | ||
1da177e4 LT |
378 | return starget; |
379 | ||
380 | found: | |
381 | found_target->reap_ref++; | |
382 | spin_unlock_irqrestore(shost->host_lock, flags); | |
383 | put_device(parent); | |
384 | kfree(starget); | |
385 | return found_target; | |
386 | } | |
387 | ||
65110b21 JB |
388 | static void scsi_target_reap_usercontext(void *data) |
389 | { | |
390 | struct scsi_target *starget = data; | |
863a930a JB |
391 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
392 | unsigned long flags; | |
393 | ||
863a930a JB |
394 | spin_lock_irqsave(shost->host_lock, flags); |
395 | ||
396 | if (--starget->reap_ref == 0 && list_empty(&starget->devices)) { | |
397 | list_del_init(&starget->siblings); | |
398 | spin_unlock_irqrestore(shost->host_lock, flags); | |
04333393 | 399 | transport_remove_device(&starget->dev); |
863a930a | 400 | device_del(&starget->dev); |
04333393 | 401 | transport_destroy_device(&starget->dev); |
863a930a JB |
402 | put_device(&starget->dev); |
403 | return; | |
404 | ||
405 | } | |
406 | spin_unlock_irqrestore(shost->host_lock, flags); | |
407 | ||
408 | return; | |
409 | } | |
410 | ||
1da177e4 LT |
411 | /** |
412 | * scsi_target_reap - check to see if target is in use and destroy if not | |
413 | * | |
414 | * @starget: target to be checked | |
415 | * | |
416 | * This is used after removing a LUN or doing a last put of the target | |
417 | * it checks atomically that nothing is using the target and removes | |
418 | * it if so. | |
419 | */ | |
420 | void scsi_target_reap(struct scsi_target *starget) | |
421 | { | |
65110b21 | 422 | scsi_execute_in_process_context(scsi_target_reap_usercontext, starget); |
1da177e4 LT |
423 | } |
424 | ||
425 | /** | |
426 | * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY | |
39216033 | 427 | * @sdev: scsi_device to probe |
1da177e4 | 428 | * @inq_result: area to store the INQUIRY result |
39216033 | 429 | * @result_len: len of inq_result |
1da177e4 LT |
430 | * @bflags: store any bflags found here |
431 | * | |
432 | * Description: | |
39216033 | 433 | * Probe the lun associated with @req using a standard SCSI INQUIRY; |
1da177e4 | 434 | * |
39216033 | 435 | * If the INQUIRY is successful, zero is returned and the |
1da177e4 | 436 | * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length |
f64a181d | 437 | * are copied to the scsi_device any flags value is stored in *@bflags. |
1da177e4 | 438 | **/ |
39216033 JB |
439 | static int scsi_probe_lun(struct scsi_device *sdev, char *inq_result, |
440 | int result_len, int *bflags) | |
1da177e4 | 441 | { |
1da177e4 LT |
442 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
443 | int first_inquiry_len, try_inquiry_len, next_inquiry_len; | |
444 | int response_len = 0; | |
39216033 | 445 | int pass, count, result; |
1da177e4 LT |
446 | struct scsi_sense_hdr sshdr; |
447 | ||
448 | *bflags = 0; | |
449 | ||
450 | /* Perform up to 3 passes. The first pass uses a conservative | |
451 | * transfer length of 36 unless sdev->inquiry_len specifies a | |
452 | * different value. */ | |
453 | first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36; | |
454 | try_inquiry_len = first_inquiry_len; | |
455 | pass = 1; | |
456 | ||
457 | next_pass: | |
9ccfc756 JB |
458 | SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
459 | "scsi scan: INQUIRY pass %d length %d\n", | |
460 | pass, try_inquiry_len)); | |
1da177e4 LT |
461 | |
462 | /* Each pass gets up to three chances to ignore Unit Attention */ | |
463 | for (count = 0; count < 3; ++count) { | |
464 | memset(scsi_cmd, 0, 6); | |
465 | scsi_cmd[0] = INQUIRY; | |
466 | scsi_cmd[4] = (unsigned char) try_inquiry_len; | |
1da177e4 LT |
467 | |
468 | memset(inq_result, 0, try_inquiry_len); | |
39216033 JB |
469 | |
470 | result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, | |
ea73a9f2 | 471 | inq_result, try_inquiry_len, &sshdr, |
39216033 | 472 | HZ / 2 + HZ * scsi_inq_timeout, 3); |
1da177e4 LT |
473 | |
474 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s " | |
475 | "with code 0x%x\n", | |
39216033 | 476 | result ? "failed" : "successful", result)); |
1da177e4 | 477 | |
39216033 | 478 | if (result) { |
1da177e4 LT |
479 | /* |
480 | * not-ready to ready transition [asc/ascq=0x28/0x0] | |
481 | * or power-on, reset [asc/ascq=0x29/0x0], continue. | |
482 | * INQUIRY should not yield UNIT_ATTENTION | |
483 | * but many buggy devices do so anyway. | |
484 | */ | |
39216033 | 485 | if ((driver_byte(result) & DRIVER_SENSE) && |
ea73a9f2 | 486 | scsi_sense_valid(&sshdr)) { |
1da177e4 LT |
487 | if ((sshdr.sense_key == UNIT_ATTENTION) && |
488 | ((sshdr.asc == 0x28) || | |
489 | (sshdr.asc == 0x29)) && | |
490 | (sshdr.ascq == 0)) | |
491 | continue; | |
492 | } | |
493 | } | |
494 | break; | |
495 | } | |
496 | ||
39216033 | 497 | if (result == 0) { |
1da177e4 LT |
498 | response_len = (unsigned char) inq_result[4] + 5; |
499 | if (response_len > 255) | |
500 | response_len = first_inquiry_len; /* sanity */ | |
501 | ||
502 | /* | |
503 | * Get any flags for this device. | |
504 | * | |
f64a181d CH |
505 | * XXX add a bflags to scsi_device, and replace the |
506 | * corresponding bit fields in scsi_device, so bflags | |
1da177e4 LT |
507 | * need not be passed as an argument. |
508 | */ | |
509 | *bflags = scsi_get_device_flags(sdev, &inq_result[8], | |
510 | &inq_result[16]); | |
511 | ||
512 | /* When the first pass succeeds we gain information about | |
513 | * what larger transfer lengths might work. */ | |
514 | if (pass == 1) { | |
515 | if (BLIST_INQUIRY_36 & *bflags) | |
516 | next_inquiry_len = 36; | |
517 | else if (BLIST_INQUIRY_58 & *bflags) | |
518 | next_inquiry_len = 58; | |
519 | else if (sdev->inquiry_len) | |
520 | next_inquiry_len = sdev->inquiry_len; | |
521 | else | |
522 | next_inquiry_len = response_len; | |
523 | ||
524 | /* If more data is available perform the second pass */ | |
525 | if (next_inquiry_len > try_inquiry_len) { | |
526 | try_inquiry_len = next_inquiry_len; | |
527 | pass = 2; | |
528 | goto next_pass; | |
529 | } | |
530 | } | |
531 | ||
532 | } else if (pass == 2) { | |
533 | printk(KERN_INFO "scsi scan: %d byte inquiry failed. " | |
534 | "Consider BLIST_INQUIRY_36 for this device\n", | |
535 | try_inquiry_len); | |
536 | ||
537 | /* If this pass failed, the third pass goes back and transfers | |
538 | * the same amount as we successfully got in the first pass. */ | |
539 | try_inquiry_len = first_inquiry_len; | |
540 | pass = 3; | |
541 | goto next_pass; | |
542 | } | |
543 | ||
544 | /* If the last transfer attempt got an error, assume the | |
545 | * peripheral doesn't exist or is dead. */ | |
39216033 JB |
546 | if (result) |
547 | return -EIO; | |
1da177e4 LT |
548 | |
549 | /* Don't report any more data than the device says is valid */ | |
550 | sdev->inquiry_len = min(try_inquiry_len, response_len); | |
551 | ||
552 | /* | |
553 | * XXX Abort if the response length is less than 36? If less than | |
554 | * 32, the lookup of the device flags (above) could be invalid, | |
555 | * and it would be possible to take an incorrect action - we do | |
556 | * not want to hang because of a short INQUIRY. On the flip side, | |
557 | * if the device is spun down or becoming ready (and so it gives a | |
558 | * short INQUIRY), an abort here prevents any further use of the | |
559 | * device, including spin up. | |
560 | * | |
561 | * Related to the above issue: | |
562 | * | |
563 | * XXX Devices (disk or all?) should be sent a TEST UNIT READY, | |
564 | * and if not ready, sent a START_STOP to start (maybe spin up) and | |
565 | * then send the INQUIRY again, since the INQUIRY can change after | |
566 | * a device is initialized. | |
567 | * | |
568 | * Ideally, start a device if explicitly asked to do so. This | |
569 | * assumes that a device is spun up on power on, spun down on | |
570 | * request, and then spun up on request. | |
571 | */ | |
572 | ||
573 | /* | |
574 | * The scanning code needs to know the scsi_level, even if no | |
575 | * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so | |
576 | * non-zero LUNs can be scanned. | |
577 | */ | |
578 | sdev->scsi_level = inq_result[2] & 0x07; | |
579 | if (sdev->scsi_level >= 2 || | |
580 | (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1)) | |
581 | sdev->scsi_level++; | |
6f3a2024 | 582 | sdev->sdev_target->scsi_level = sdev->scsi_level; |
1da177e4 | 583 | |
39216033 | 584 | return 0; |
1da177e4 LT |
585 | } |
586 | ||
587 | /** | |
f64a181d CH |
588 | * scsi_add_lun - allocate and fully initialze a scsi_device |
589 | * @sdevscan: holds information to be stored in the new scsi_device | |
590 | * @sdevnew: store the address of the newly allocated scsi_device | |
1da177e4 LT |
591 | * @inq_result: holds the result of a previous INQUIRY to the LUN |
592 | * @bflags: black/white list flag | |
593 | * | |
594 | * Description: | |
f64a181d | 595 | * Allocate and initialize a scsi_device matching sdevscan. Optionally |
1da177e4 | 596 | * set fields based on values in *@bflags. If @sdevnew is not |
f64a181d | 597 | * NULL, store the address of the new scsi_device in *@sdevnew (needed |
1da177e4 LT |
598 | * when scanning a particular LUN). |
599 | * | |
600 | * Return: | |
f64a181d CH |
601 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device |
602 | * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized | |
1da177e4 LT |
603 | **/ |
604 | static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags) | |
605 | { | |
606 | /* | |
607 | * XXX do not save the inquiry, since it can change underneath us, | |
608 | * save just vendor/model/rev. | |
609 | * | |
610 | * Rather than save it and have an ioctl that retrieves the saved | |
611 | * value, have an ioctl that executes the same INQUIRY code used | |
612 | * in scsi_probe_lun, let user level programs doing INQUIRY | |
613 | * scanning run at their own risk, or supply a user level program | |
614 | * that can correctly scan. | |
615 | */ | |
616 | sdev->inquiry = kmalloc(sdev->inquiry_len, GFP_ATOMIC); | |
617 | if (sdev->inquiry == NULL) { | |
618 | return SCSI_SCAN_NO_RESPONSE; | |
619 | } | |
620 | ||
621 | memcpy(sdev->inquiry, inq_result, sdev->inquiry_len); | |
622 | sdev->vendor = (char *) (sdev->inquiry + 8); | |
623 | sdev->model = (char *) (sdev->inquiry + 16); | |
624 | sdev->rev = (char *) (sdev->inquiry + 32); | |
625 | ||
626 | if (*bflags & BLIST_ISROM) { | |
627 | /* | |
628 | * It would be better to modify sdev->type, and set | |
629 | * sdev->removable, but then the print_inquiry() output | |
630 | * would not show TYPE_ROM; if print_inquiry() is removed | |
631 | * the issue goes away. | |
632 | */ | |
633 | inq_result[0] = TYPE_ROM; | |
634 | inq_result[1] |= 0x80; /* removable */ | |
635 | } else if (*bflags & BLIST_NO_ULD_ATTACH) | |
636 | sdev->no_uld_attach = 1; | |
637 | ||
638 | switch (sdev->type = (inq_result[0] & 0x1f)) { | |
639 | case TYPE_TAPE: | |
640 | case TYPE_DISK: | |
641 | case TYPE_PRINTER: | |
642 | case TYPE_MOD: | |
643 | case TYPE_PROCESSOR: | |
644 | case TYPE_SCANNER: | |
645 | case TYPE_MEDIUM_CHANGER: | |
646 | case TYPE_ENCLOSURE: | |
647 | case TYPE_COMM: | |
631e8a13 | 648 | case TYPE_RBC: |
1da177e4 LT |
649 | sdev->writeable = 1; |
650 | break; | |
651 | case TYPE_WORM: | |
652 | case TYPE_ROM: | |
653 | sdev->writeable = 0; | |
654 | break; | |
655 | default: | |
656 | printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type); | |
657 | } | |
658 | ||
659 | print_inquiry(inq_result); | |
660 | ||
661 | /* | |
662 | * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI | |
663 | * spec says: The device server is capable of supporting the | |
664 | * specified peripheral device type on this logical unit. However, | |
665 | * the physical device is not currently connected to this logical | |
666 | * unit. | |
667 | * | |
668 | * The above is vague, as it implies that we could treat 001 and | |
669 | * 011 the same. Stay compatible with previous code, and create a | |
f64a181d | 670 | * scsi_device for a PQ of 1 |
1da177e4 LT |
671 | * |
672 | * Don't set the device offline here; rather let the upper | |
673 | * level drivers eval the PQ to decide whether they should | |
674 | * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check. | |
675 | */ | |
676 | ||
677 | sdev->inq_periph_qual = (inq_result[0] >> 5) & 7; | |
678 | sdev->removable = (0x80 & inq_result[1]) >> 7; | |
679 | sdev->lockable = sdev->removable; | |
680 | sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2); | |
681 | ||
682 | if (sdev->scsi_level >= SCSI_3 || (sdev->inquiry_len > 56 && | |
683 | inq_result[56] & 0x04)) | |
684 | sdev->ppr = 1; | |
685 | if (inq_result[7] & 0x60) | |
686 | sdev->wdtr = 1; | |
687 | if (inq_result[7] & 0x10) | |
688 | sdev->sdtr = 1; | |
689 | ||
1da177e4 | 690 | /* |
5e3c34c1 | 691 | * End sysfs code. |
1da177e4 LT |
692 | */ |
693 | ||
694 | if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) && | |
695 | !(*bflags & BLIST_NOTQ)) | |
696 | sdev->tagged_supported = 1; | |
697 | /* | |
698 | * Some devices (Texel CD ROM drives) have handshaking problems | |
699 | * when used with the Seagate controllers. borken is initialized | |
700 | * to 1, and then set it to 0 here. | |
701 | */ | |
702 | if ((*bflags & BLIST_BORKEN) == 0) | |
703 | sdev->borken = 0; | |
704 | ||
705 | /* | |
706 | * Apparently some really broken devices (contrary to the SCSI | |
707 | * standards) need to be selected without asserting ATN | |
708 | */ | |
709 | if (*bflags & BLIST_SELECT_NO_ATN) | |
710 | sdev->select_no_atn = 1; | |
711 | ||
712 | /* | |
713 | * Some devices may not want to have a start command automatically | |
714 | * issued when a device is added. | |
715 | */ | |
716 | if (*bflags & BLIST_NOSTARTONADD) | |
717 | sdev->no_start_on_add = 1; | |
718 | ||
719 | if (*bflags & BLIST_SINGLELUN) | |
720 | sdev->single_lun = 1; | |
721 | ||
722 | ||
723 | sdev->use_10_for_rw = 1; | |
724 | ||
725 | if (*bflags & BLIST_MS_SKIP_PAGE_08) | |
726 | sdev->skip_ms_page_8 = 1; | |
727 | ||
728 | if (*bflags & BLIST_MS_SKIP_PAGE_3F) | |
729 | sdev->skip_ms_page_3f = 1; | |
730 | ||
731 | if (*bflags & BLIST_USE_10_BYTE_MS) | |
732 | sdev->use_10_for_ms = 1; | |
733 | ||
734 | /* set the device running here so that slave configure | |
735 | * may do I/O */ | |
736 | scsi_device_set_state(sdev, SDEV_RUNNING); | |
737 | ||
738 | if (*bflags & BLIST_MS_192_BYTES_FOR_3F) | |
739 | sdev->use_192_bytes_for_3f = 1; | |
740 | ||
741 | if (*bflags & BLIST_NOT_LOCKABLE) | |
742 | sdev->lockable = 0; | |
743 | ||
744 | if (*bflags & BLIST_RETRY_HWERROR) | |
745 | sdev->retry_hwerror = 1; | |
746 | ||
747 | transport_configure_device(&sdev->sdev_gendev); | |
748 | ||
749 | if (sdev->host->hostt->slave_configure) | |
750 | sdev->host->hostt->slave_configure(sdev); | |
751 | ||
752 | /* | |
753 | * Ok, the device is now all set up, we can | |
754 | * register it and tell the rest of the kernel | |
755 | * about it. | |
756 | */ | |
b24b1033 AS |
757 | if (scsi_sysfs_add_sdev(sdev) != 0) |
758 | return SCSI_SCAN_NO_RESPONSE; | |
1da177e4 LT |
759 | |
760 | return SCSI_SCAN_LUN_PRESENT; | |
761 | } | |
762 | ||
6f3a2024 JB |
763 | static inline void scsi_destroy_sdev(struct scsi_device *sdev) |
764 | { | |
765 | if (sdev->host->hostt->slave_destroy) | |
766 | sdev->host->hostt->slave_destroy(sdev); | |
767 | transport_destroy_device(&sdev->sdev_gendev); | |
768 | put_device(&sdev->sdev_gendev); | |
769 | } | |
770 | ||
771 | ||
1da177e4 LT |
772 | /** |
773 | * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it | |
774 | * @starget: pointer to target device structure | |
775 | * @lun: LUN of target device | |
f64a181d CH |
776 | * @sdevscan: probe the LUN corresponding to this scsi_device |
777 | * @sdevnew: store the value of any new scsi_device allocated | |
1da177e4 LT |
778 | * @bflagsp: store bflags here if not NULL |
779 | * | |
780 | * Description: | |
781 | * Call scsi_probe_lun, if a LUN with an attached device is found, | |
782 | * allocate and set it up by calling scsi_add_lun. | |
783 | * | |
784 | * Return: | |
f64a181d | 785 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device |
1da177e4 LT |
786 | * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is |
787 | * attached at the LUN | |
f64a181d | 788 | * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized |
1da177e4 LT |
789 | **/ |
790 | static int scsi_probe_and_add_lun(struct scsi_target *starget, | |
791 | uint lun, int *bflagsp, | |
792 | struct scsi_device **sdevp, int rescan, | |
793 | void *hostdata) | |
794 | { | |
795 | struct scsi_device *sdev; | |
1da177e4 | 796 | unsigned char *result; |
39216033 | 797 | int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256; |
1da177e4 LT |
798 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
799 | ||
800 | /* | |
801 | * The rescan flag is used as an optimization, the first scan of a | |
802 | * host adapter calls into here with rescan == 0. | |
803 | */ | |
6f3a2024 JB |
804 | sdev = scsi_device_lookup_by_target(starget, lun); |
805 | if (sdev) { | |
806 | if (rescan || sdev->sdev_state != SDEV_CREATED) { | |
1da177e4 LT |
807 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO |
808 | "scsi scan: device exists on %s\n", | |
809 | sdev->sdev_gendev.bus_id)); | |
810 | if (sdevp) | |
811 | *sdevp = sdev; | |
812 | else | |
813 | scsi_device_put(sdev); | |
814 | ||
815 | if (bflagsp) | |
816 | *bflagsp = scsi_get_device_flags(sdev, | |
817 | sdev->vendor, | |
818 | sdev->model); | |
819 | return SCSI_SCAN_LUN_PRESENT; | |
820 | } | |
6f3a2024 JB |
821 | scsi_device_put(sdev); |
822 | } else | |
823 | sdev = scsi_alloc_sdev(starget, lun, hostdata); | |
1da177e4 LT |
824 | if (!sdev) |
825 | goto out; | |
39216033 JB |
826 | |
827 | result = kmalloc(result_len, GFP_ATOMIC | | |
bc86120a | 828 | ((shost->unchecked_isa_dma) ? __GFP_DMA : 0)); |
1da177e4 | 829 | if (!result) |
39216033 | 830 | goto out_free_sdev; |
1da177e4 | 831 | |
39216033 | 832 | if (scsi_probe_lun(sdev, result, result_len, &bflags)) |
1da177e4 LT |
833 | goto out_free_result; |
834 | ||
835 | /* | |
836 | * result contains valid SCSI INQUIRY data. | |
837 | */ | |
838 | if ((result[0] >> 5) == 3) { | |
839 | /* | |
840 | * For a Peripheral qualifier 3 (011b), the SCSI | |
841 | * spec says: The device server is not capable of | |
842 | * supporting a physical device on this logical | |
843 | * unit. | |
844 | * | |
845 | * For disks, this implies that there is no | |
846 | * logical disk configured at sdev->lun, but there | |
847 | * is a target id responding. | |
848 | */ | |
849 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO | |
850 | "scsi scan: peripheral qualifier of 3," | |
851 | " no device added\n")); | |
852 | res = SCSI_SCAN_TARGET_PRESENT; | |
853 | goto out_free_result; | |
854 | } | |
855 | ||
1bfc5d9d AS |
856 | /* |
857 | * Non-standard SCSI targets may set the PDT to 0x1f (unknown or | |
858 | * no device type) instead of using the Peripheral Qualifier to | |
859 | * indicate that no LUN is present. For example, USB UFI does this. | |
860 | */ | |
861 | if (starget->pdt_1f_for_no_lun && (result[0] & 0x1f) == 0x1f) { | |
862 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO | |
863 | "scsi scan: peripheral device type" | |
864 | " of 31, no device added\n")); | |
865 | res = SCSI_SCAN_TARGET_PRESENT; | |
866 | goto out_free_result; | |
867 | } | |
868 | ||
1da177e4 LT |
869 | res = scsi_add_lun(sdev, result, &bflags); |
870 | if (res == SCSI_SCAN_LUN_PRESENT) { | |
871 | if (bflags & BLIST_KEY) { | |
872 | sdev->lockable = 0; | |
39216033 | 873 | scsi_unlock_floptical(sdev, result); |
1da177e4 LT |
874 | } |
875 | if (bflagsp) | |
876 | *bflagsp = bflags; | |
877 | } | |
878 | ||
879 | out_free_result: | |
880 | kfree(result); | |
1da177e4 LT |
881 | out_free_sdev: |
882 | if (res == SCSI_SCAN_LUN_PRESENT) { | |
883 | if (sdevp) { | |
b70d37bf AS |
884 | if (scsi_device_get(sdev) == 0) { |
885 | *sdevp = sdev; | |
886 | } else { | |
887 | __scsi_remove_device(sdev); | |
888 | res = SCSI_SCAN_NO_RESPONSE; | |
889 | } | |
1da177e4 | 890 | } |
6f3a2024 JB |
891 | } else |
892 | scsi_destroy_sdev(sdev); | |
1da177e4 LT |
893 | out: |
894 | return res; | |
895 | } | |
896 | ||
897 | /** | |
898 | * scsi_sequential_lun_scan - sequentially scan a SCSI target | |
899 | * @starget: pointer to target structure to scan | |
900 | * @bflags: black/white list flag for LUN 0 | |
901 | * @lun0_res: result of scanning LUN 0 | |
902 | * | |
903 | * Description: | |
904 | * Generally, scan from LUN 1 (LUN 0 is assumed to already have been | |
905 | * scanned) to some maximum lun until a LUN is found with no device | |
906 | * attached. Use the bflags to figure out any oddities. | |
907 | * | |
908 | * Modifies sdevscan->lun. | |
909 | **/ | |
910 | static void scsi_sequential_lun_scan(struct scsi_target *starget, | |
911 | int bflags, int lun0_res, int scsi_level, | |
912 | int rescan) | |
913 | { | |
914 | unsigned int sparse_lun, lun, max_dev_lun; | |
915 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
916 | ||
917 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of" | |
918 | "%s\n", starget->dev.bus_id)); | |
919 | ||
920 | max_dev_lun = min(max_scsi_luns, shost->max_lun); | |
921 | /* | |
922 | * If this device is known to support sparse multiple units, | |
923 | * override the other settings, and scan all of them. Normally, | |
924 | * SCSI-3 devices should be scanned via the REPORT LUNS. | |
925 | */ | |
926 | if (bflags & BLIST_SPARSELUN) { | |
927 | max_dev_lun = shost->max_lun; | |
928 | sparse_lun = 1; | |
929 | } else | |
930 | sparse_lun = 0; | |
931 | ||
932 | /* | |
933 | * If not sparse lun and no device attached at LUN 0 do not scan | |
934 | * any further. | |
935 | */ | |
936 | if (!sparse_lun && (lun0_res != SCSI_SCAN_LUN_PRESENT)) | |
937 | return; | |
938 | ||
939 | /* | |
940 | * If less than SCSI_1_CSS, and no special lun scaning, stop | |
941 | * scanning; this matches 2.4 behaviour, but could just be a bug | |
942 | * (to continue scanning a SCSI_1_CSS device). | |
943 | * | |
944 | * This test is broken. We might not have any device on lun0 for | |
945 | * a sparselun device, and if that's the case then how would we | |
946 | * know the real scsi_level, eh? It might make sense to just not | |
947 | * scan any SCSI_1 device for non-0 luns, but that check would best | |
948 | * go into scsi_alloc_sdev() and just have it return null when asked | |
949 | * to alloc an sdev for lun > 0 on an already found SCSI_1 device. | |
950 | * | |
951 | if ((sdevscan->scsi_level < SCSI_1_CCS) && | |
952 | ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN)) | |
953 | == 0)) | |
954 | return; | |
955 | */ | |
956 | /* | |
957 | * If this device is known to support multiple units, override | |
958 | * the other settings, and scan all of them. | |
959 | */ | |
960 | if (bflags & BLIST_FORCELUN) | |
961 | max_dev_lun = shost->max_lun; | |
962 | /* | |
963 | * REGAL CDC-4X: avoid hang after LUN 4 | |
964 | */ | |
965 | if (bflags & BLIST_MAX5LUN) | |
966 | max_dev_lun = min(5U, max_dev_lun); | |
967 | /* | |
968 | * Do not scan SCSI-2 or lower device past LUN 7, unless | |
969 | * BLIST_LARGELUN. | |
970 | */ | |
971 | if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN)) | |
972 | max_dev_lun = min(8U, max_dev_lun); | |
973 | ||
974 | /* | |
975 | * We have already scanned LUN 0, so start at LUN 1. Keep scanning | |
976 | * until we reach the max, or no LUN is found and we are not | |
977 | * sparse_lun. | |
978 | */ | |
979 | for (lun = 1; lun < max_dev_lun; ++lun) | |
980 | if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, | |
981 | NULL) != SCSI_SCAN_LUN_PRESENT) && | |
982 | !sparse_lun) | |
983 | return; | |
984 | } | |
985 | ||
986 | /** | |
987 | * scsilun_to_int: convert a scsi_lun to an int | |
988 | * @scsilun: struct scsi_lun to be converted. | |
989 | * | |
990 | * Description: | |
991 | * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered | |
992 | * integer, and return the result. The caller must check for | |
993 | * truncation before using this function. | |
994 | * | |
995 | * Notes: | |
996 | * The struct scsi_lun is assumed to be four levels, with each level | |
997 | * effectively containing a SCSI byte-ordered (big endian) short; the | |
998 | * addressing bits of each level are ignored (the highest two bits). | |
999 | * For a description of the LUN format, post SCSI-3 see the SCSI | |
1000 | * Architecture Model, for SCSI-3 see the SCSI Controller Commands. | |
1001 | * | |
1002 | * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns | |
1003 | * the integer: 0x0b030a04 | |
1004 | **/ | |
1005 | static int scsilun_to_int(struct scsi_lun *scsilun) | |
1006 | { | |
1007 | int i; | |
1008 | unsigned int lun; | |
1009 | ||
1010 | lun = 0; | |
1011 | for (i = 0; i < sizeof(lun); i += 2) | |
1012 | lun = lun | (((scsilun->scsi_lun[i] << 8) | | |
1013 | scsilun->scsi_lun[i + 1]) << (i * 8)); | |
1014 | return lun; | |
1015 | } | |
1016 | ||
2f4701d8 JSEC |
1017 | /** |
1018 | * int_to_scsilun: reverts an int into a scsi_lun | |
1019 | * @int: integer to be reverted | |
1020 | * @scsilun: struct scsi_lun to be set. | |
1021 | * | |
1022 | * Description: | |
1023 | * Reverts the functionality of the scsilun_to_int, which packed | |
1024 | * an 8-byte lun value into an int. This routine unpacks the int | |
1025 | * back into the lun value. | |
1026 | * Note: the scsilun_to_int() routine does not truly handle all | |
1027 | * 8bytes of the lun value. This functions restores only as much | |
1028 | * as was set by the routine. | |
1029 | * | |
1030 | * Notes: | |
1031 | * Given an integer : 0x0b030a04, this function returns a | |
1032 | * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00 | |
1033 | * | |
1034 | **/ | |
1035 | void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun) | |
1036 | { | |
1037 | int i; | |
1038 | ||
1039 | memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun)); | |
1040 | ||
1041 | for (i = 0; i < sizeof(lun); i += 2) { | |
1042 | scsilun->scsi_lun[i] = (lun >> 8) & 0xFF; | |
1043 | scsilun->scsi_lun[i+1] = lun & 0xFF; | |
1044 | lun = lun >> 16; | |
1045 | } | |
1046 | } | |
1047 | EXPORT_SYMBOL(int_to_scsilun); | |
1048 | ||
1da177e4 LT |
1049 | /** |
1050 | * scsi_report_lun_scan - Scan using SCSI REPORT LUN results | |
f64a181d | 1051 | * @sdevscan: scan the host, channel, and id of this scsi_device |
1da177e4 LT |
1052 | * |
1053 | * Description: | |
1054 | * If @sdevscan is for a SCSI-3 or up device, send a REPORT LUN | |
1055 | * command, and scan the resulting list of LUNs by calling | |
1056 | * scsi_probe_and_add_lun. | |
1057 | * | |
1058 | * Modifies sdevscan->lun. | |
1059 | * | |
1060 | * Return: | |
1061 | * 0: scan completed (or no memory, so further scanning is futile) | |
1062 | * 1: no report lun scan, or not configured | |
1063 | **/ | |
6f3a2024 | 1064 | static int scsi_report_lun_scan(struct scsi_target *starget, int bflags, |
1da177e4 LT |
1065 | int rescan) |
1066 | { | |
1067 | char devname[64]; | |
1068 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
1069 | unsigned int length; | |
1070 | unsigned int lun; | |
1071 | unsigned int num_luns; | |
1072 | unsigned int retries; | |
39216033 | 1073 | int result; |
1da177e4 | 1074 | struct scsi_lun *lunp, *lun_data; |
1da177e4 LT |
1075 | u8 *data; |
1076 | struct scsi_sense_hdr sshdr; | |
6f3a2024 JB |
1077 | struct scsi_device *sdev; |
1078 | struct Scsi_Host *shost = dev_to_shost(&starget->dev); | |
2ef89198 | 1079 | int ret = 0; |
1da177e4 LT |
1080 | |
1081 | /* | |
1082 | * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set. | |
1083 | * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does | |
1084 | * support more than 8 LUNs. | |
1085 | */ | |
1086 | if ((bflags & BLIST_NOREPORTLUN) || | |
6f3a2024 JB |
1087 | starget->scsi_level < SCSI_2 || |
1088 | (starget->scsi_level < SCSI_3 && | |
1089 | (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) ) | |
1da177e4 LT |
1090 | return 1; |
1091 | if (bflags & BLIST_NOLUN) | |
1092 | return 0; | |
1093 | ||
6f3a2024 JB |
1094 | if (!(sdev = scsi_device_lookup_by_target(starget, 0))) { |
1095 | sdev = scsi_alloc_sdev(starget, 0, NULL); | |
1096 | if (!sdev) | |
1097 | return 0; | |
1098 | if (scsi_device_get(sdev)) | |
1099 | return 0; | |
1100 | } | |
1101 | ||
1da177e4 | 1102 | sprintf(devname, "host %d channel %d id %d", |
6f3a2024 | 1103 | shost->host_no, sdev->channel, sdev->id); |
1da177e4 LT |
1104 | |
1105 | /* | |
1106 | * Allocate enough to hold the header (the same size as one scsi_lun) | |
1107 | * plus the max number of luns we are requesting. | |
1108 | * | |
1109 | * Reallocating and trying again (with the exact amount we need) | |
1110 | * would be nice, but then we need to somehow limit the size | |
1111 | * allocated based on the available memory and the limits of | |
1112 | * kmalloc - we don't want a kmalloc() failure of a huge value to | |
1113 | * prevent us from finding any LUNs on this target. | |
1114 | */ | |
1115 | length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun); | |
1116 | lun_data = kmalloc(length, GFP_ATOMIC | | |
1117 | (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0)); | |
6f3a2024 JB |
1118 | if (!lun_data) { |
1119 | printk(ALLOC_FAILURE_MSG, __FUNCTION__); | |
39216033 | 1120 | goto out; |
6f3a2024 | 1121 | } |
1da177e4 LT |
1122 | |
1123 | scsi_cmd[0] = REPORT_LUNS; | |
1124 | ||
1125 | /* | |
1126 | * bytes 1 - 5: reserved, set to zero. | |
1127 | */ | |
1128 | memset(&scsi_cmd[1], 0, 5); | |
1129 | ||
1130 | /* | |
1131 | * bytes 6 - 9: length of the command. | |
1132 | */ | |
1133 | scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff; | |
1134 | scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff; | |
1135 | scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff; | |
1136 | scsi_cmd[9] = (unsigned char) length & 0xff; | |
1137 | ||
1138 | scsi_cmd[10] = 0; /* reserved */ | |
1139 | scsi_cmd[11] = 0; /* control */ | |
1da177e4 LT |
1140 | |
1141 | /* | |
1142 | * We can get a UNIT ATTENTION, for example a power on/reset, so | |
1143 | * retry a few times (like sd.c does for TEST UNIT READY). | |
1144 | * Experience shows some combinations of adapter/devices get at | |
1145 | * least two power on/resets. | |
1146 | * | |
1147 | * Illegal requests (for devices that do not support REPORT LUNS) | |
1148 | * should come through as a check condition, and will not generate | |
1149 | * a retry. | |
1150 | */ | |
1151 | for (retries = 0; retries < 3; retries++) { | |
1152 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending" | |
1153 | " REPORT LUNS to %s (try %d)\n", devname, | |
1154 | retries)); | |
39216033 | 1155 | |
39216033 | 1156 | result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, |
ea73a9f2 | 1157 | lun_data, length, &sshdr, |
39216033 JB |
1158 | SCSI_TIMEOUT + 4 * HZ, 3); |
1159 | ||
1da177e4 | 1160 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS" |
39216033 JB |
1161 | " %s (try %d) result 0x%x\n", result |
1162 | ? "failed" : "successful", retries, result)); | |
1163 | if (result == 0) | |
1da177e4 | 1164 | break; |
ea73a9f2 | 1165 | else if (scsi_sense_valid(&sshdr)) { |
1da177e4 LT |
1166 | if (sshdr.sense_key != UNIT_ATTENTION) |
1167 | break; | |
1168 | } | |
1169 | } | |
1170 | ||
39216033 | 1171 | if (result) { |
1da177e4 LT |
1172 | /* |
1173 | * The device probably does not support a REPORT LUN command | |
1174 | */ | |
2ef89198 AS |
1175 | ret = 1; |
1176 | goto out_err; | |
1da177e4 | 1177 | } |
1da177e4 LT |
1178 | |
1179 | /* | |
1180 | * Get the length from the first four bytes of lun_data. | |
1181 | */ | |
1182 | data = (u8 *) lun_data->scsi_lun; | |
1183 | length = ((data[0] << 24) | (data[1] << 16) | | |
1184 | (data[2] << 8) | (data[3] << 0)); | |
1185 | ||
1186 | num_luns = (length / sizeof(struct scsi_lun)); | |
1187 | if (num_luns > max_scsi_report_luns) { | |
1188 | printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)" | |
1189 | " of %d luns reported, try increasing" | |
1190 | " max_scsi_report_luns.\n", devname, | |
1191 | max_scsi_report_luns, num_luns); | |
1192 | num_luns = max_scsi_report_luns; | |
1193 | } | |
1194 | ||
3bf743e7 JG |
1195 | SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, |
1196 | "scsi scan: REPORT LUN scan\n")); | |
1da177e4 LT |
1197 | |
1198 | /* | |
1199 | * Scan the luns in lun_data. The entry at offset 0 is really | |
1200 | * the header, so start at 1 and go up to and including num_luns. | |
1201 | */ | |
1202 | for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) { | |
1203 | lun = scsilun_to_int(lunp); | |
1204 | ||
1205 | /* | |
1206 | * Check if the unused part of lunp is non-zero, and so | |
1207 | * does not fit in lun. | |
1208 | */ | |
1209 | if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) { | |
1210 | int i; | |
1211 | ||
1212 | /* | |
1213 | * Output an error displaying the LUN in byte order, | |
1214 | * this differs from what linux would print for the | |
1215 | * integer LUN value. | |
1216 | */ | |
1217 | printk(KERN_WARNING "scsi: %s lun 0x", devname); | |
1218 | data = (char *)lunp->scsi_lun; | |
1219 | for (i = 0; i < sizeof(struct scsi_lun); i++) | |
1220 | printk("%02x", data[i]); | |
1221 | printk(" has a LUN larger than currently supported.\n"); | |
1da177e4 LT |
1222 | } else if (lun > sdev->host->max_lun) { |
1223 | printk(KERN_WARNING "scsi: %s lun%d has a LUN larger" | |
1224 | " than allowed by the host adapter\n", | |
1225 | devname, lun); | |
1226 | } else { | |
1227 | int res; | |
1228 | ||
1229 | res = scsi_probe_and_add_lun(starget, | |
1230 | lun, NULL, NULL, rescan, NULL); | |
1231 | if (res == SCSI_SCAN_NO_RESPONSE) { | |
1232 | /* | |
1233 | * Got some results, but now none, abort. | |
1234 | */ | |
3bf743e7 JG |
1235 | sdev_printk(KERN_ERR, sdev, |
1236 | "Unexpected response" | |
1237 | " from lun %d while scanning, scan" | |
1238 | " aborted\n", lun); | |
1da177e4 LT |
1239 | break; |
1240 | } | |
1241 | } | |
1242 | } | |
1243 | ||
2ef89198 | 1244 | out_err: |
1da177e4 | 1245 | kfree(lun_data); |
1da177e4 | 1246 | out: |
6f3a2024 JB |
1247 | scsi_device_put(sdev); |
1248 | if (sdev->sdev_state == SDEV_CREATED) | |
1249 | /* | |
1250 | * the sdev we used didn't appear in the report luns scan | |
1251 | */ | |
1252 | scsi_destroy_sdev(sdev); | |
2ef89198 | 1253 | return ret; |
1da177e4 LT |
1254 | } |
1255 | ||
1256 | struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel, | |
1257 | uint id, uint lun, void *hostdata) | |
1258 | { | |
a97a83a0 | 1259 | struct scsi_device *sdev = ERR_PTR(-ENODEV); |
1da177e4 | 1260 | struct device *parent = &shost->shost_gendev; |
e02f3f59 | 1261 | struct scsi_target *starget; |
1da177e4 | 1262 | |
e02f3f59 | 1263 | starget = scsi_alloc_target(parent, channel, id); |
1da177e4 LT |
1264 | if (!starget) |
1265 | return ERR_PTR(-ENOMEM); | |
1266 | ||
c92715b3 | 1267 | get_device(&starget->dev); |
0b950672 | 1268 | mutex_lock(&shost->scan_mutex); |
a97a83a0 MW |
1269 | if (scsi_host_scan_allowed(shost)) |
1270 | scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata); | |
0b950672 | 1271 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
1272 | scsi_target_reap(starget); |
1273 | put_device(&starget->dev); | |
1274 | ||
1275 | return sdev; | |
1276 | } | |
1277 | EXPORT_SYMBOL(__scsi_add_device); | |
1278 | ||
146f7262 JB |
1279 | int scsi_add_device(struct Scsi_Host *host, uint channel, |
1280 | uint target, uint lun) | |
1281 | { | |
1282 | struct scsi_device *sdev = | |
1283 | __scsi_add_device(host, channel, target, lun, NULL); | |
1284 | if (IS_ERR(sdev)) | |
1285 | return PTR_ERR(sdev); | |
1286 | ||
1287 | scsi_device_put(sdev); | |
1288 | return 0; | |
1289 | } | |
1290 | EXPORT_SYMBOL(scsi_add_device); | |
1291 | ||
1da177e4 LT |
1292 | void scsi_rescan_device(struct device *dev) |
1293 | { | |
1294 | struct scsi_driver *drv; | |
1295 | ||
1296 | if (!dev->driver) | |
1297 | return; | |
1298 | ||
1299 | drv = to_scsi_driver(dev->driver); | |
1300 | if (try_module_get(drv->owner)) { | |
1301 | if (drv->rescan) | |
1302 | drv->rescan(dev); | |
1303 | module_put(drv->owner); | |
1304 | } | |
1305 | } | |
1306 | EXPORT_SYMBOL(scsi_rescan_device); | |
1307 | ||
e517d313 AS |
1308 | static void __scsi_scan_target(struct device *parent, unsigned int channel, |
1309 | unsigned int id, unsigned int lun, int rescan) | |
1da177e4 LT |
1310 | { |
1311 | struct Scsi_Host *shost = dev_to_shost(parent); | |
1312 | int bflags = 0; | |
1313 | int res; | |
1da177e4 LT |
1314 | struct scsi_target *starget; |
1315 | ||
1316 | if (shost->this_id == id) | |
1317 | /* | |
1318 | * Don't scan the host adapter | |
1319 | */ | |
1320 | return; | |
1321 | ||
1da177e4 | 1322 | starget = scsi_alloc_target(parent, channel, id); |
1da177e4 LT |
1323 | if (!starget) |
1324 | return; | |
1325 | ||
1326 | get_device(&starget->dev); | |
1327 | if (lun != SCAN_WILD_CARD) { | |
1328 | /* | |
1329 | * Scan for a specific host/chan/id/lun. | |
1330 | */ | |
1331 | scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL); | |
1332 | goto out_reap; | |
1333 | } | |
1334 | ||
1335 | /* | |
1336 | * Scan LUN 0, if there is some response, scan further. Ideally, we | |
1337 | * would not configure LUN 0 until all LUNs are scanned. | |
1338 | */ | |
6f3a2024 JB |
1339 | res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL); |
1340 | if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) { | |
1341 | if (scsi_report_lun_scan(starget, bflags, rescan) != 0) | |
1da177e4 LT |
1342 | /* |
1343 | * The REPORT LUN did not scan the target, | |
1344 | * do a sequential scan. | |
1345 | */ | |
1346 | scsi_sequential_lun_scan(starget, bflags, | |
6f3a2024 | 1347 | res, starget->scsi_level, rescan); |
1da177e4 | 1348 | } |
1da177e4 LT |
1349 | |
1350 | out_reap: | |
1351 | /* now determine if the target has any children at all | |
1352 | * and if not, nuke it */ | |
1353 | scsi_target_reap(starget); | |
1354 | ||
1355 | put_device(&starget->dev); | |
1356 | } | |
e517d313 AS |
1357 | |
1358 | /** | |
1359 | * scsi_scan_target - scan a target id, possibly including all LUNs on the | |
1360 | * target. | |
1361 | * @parent: host to scan | |
1362 | * @channel: channel to scan | |
1363 | * @id: target id to scan | |
1364 | * @lun: Specific LUN to scan or SCAN_WILD_CARD | |
1365 | * @rescan: passed to LUN scanning routines | |
1366 | * | |
1367 | * Description: | |
1368 | * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0, | |
1369 | * and possibly all LUNs on the target id. | |
1370 | * | |
1371 | * First try a REPORT LUN scan, if that does not scan the target, do a | |
1372 | * sequential scan of LUNs on the target id. | |
1373 | **/ | |
1374 | void scsi_scan_target(struct device *parent, unsigned int channel, | |
1375 | unsigned int id, unsigned int lun, int rescan) | |
1376 | { | |
1377 | struct Scsi_Host *shost = dev_to_shost(parent); | |
1378 | ||
0b950672 | 1379 | mutex_lock(&shost->scan_mutex); |
e517d313 AS |
1380 | if (scsi_host_scan_allowed(shost)) |
1381 | __scsi_scan_target(parent, channel, id, lun, rescan); | |
0b950672 | 1382 | mutex_unlock(&shost->scan_mutex); |
e517d313 | 1383 | } |
1da177e4 LT |
1384 | EXPORT_SYMBOL(scsi_scan_target); |
1385 | ||
1386 | static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel, | |
1387 | unsigned int id, unsigned int lun, int rescan) | |
1388 | { | |
1389 | uint order_id; | |
1390 | ||
1391 | if (id == SCAN_WILD_CARD) | |
1392 | for (id = 0; id < shost->max_id; ++id) { | |
1393 | /* | |
1394 | * XXX adapter drivers when possible (FCP, iSCSI) | |
1395 | * could modify max_id to match the current max, | |
1396 | * not the absolute max. | |
1397 | * | |
1398 | * XXX add a shost id iterator, so for example, | |
1399 | * the FC ID can be the same as a target id | |
1400 | * without a huge overhead of sparse id's. | |
1401 | */ | |
1402 | if (shost->reverse_ordering) | |
1403 | /* | |
1404 | * Scan from high to low id. | |
1405 | */ | |
1406 | order_id = shost->max_id - id - 1; | |
1407 | else | |
1408 | order_id = id; | |
e517d313 AS |
1409 | __scsi_scan_target(&shost->shost_gendev, channel, |
1410 | order_id, lun, rescan); | |
1da177e4 LT |
1411 | } |
1412 | else | |
e517d313 AS |
1413 | __scsi_scan_target(&shost->shost_gendev, channel, |
1414 | id, lun, rescan); | |
1da177e4 LT |
1415 | } |
1416 | ||
1417 | int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel, | |
1418 | unsigned int id, unsigned int lun, int rescan) | |
1419 | { | |
3bf743e7 JG |
1420 | SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost, |
1421 | "%s: <%u:%u:%u>\n", | |
1422 | __FUNCTION__, channel, id, lun)); | |
1da177e4 LT |
1423 | |
1424 | if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) || | |
1425 | ((id != SCAN_WILD_CARD) && (id > shost->max_id)) || | |
1426 | ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun))) | |
1427 | return -EINVAL; | |
1428 | ||
0b950672 | 1429 | mutex_lock(&shost->scan_mutex); |
82f29467 MA |
1430 | if (scsi_host_scan_allowed(shost)) { |
1431 | if (channel == SCAN_WILD_CARD) | |
1432 | for (channel = 0; channel <= shost->max_channel; | |
1433 | channel++) | |
1434 | scsi_scan_channel(shost, channel, id, lun, | |
1435 | rescan); | |
1436 | else | |
1da177e4 | 1437 | scsi_scan_channel(shost, channel, id, lun, rescan); |
82f29467 | 1438 | } |
0b950672 | 1439 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
1440 | |
1441 | return 0; | |
1442 | } | |
1443 | ||
1444 | /** | |
1445 | * scsi_scan_host - scan the given adapter | |
1446 | * @shost: adapter to scan | |
1447 | **/ | |
1448 | void scsi_scan_host(struct Scsi_Host *shost) | |
1449 | { | |
1450 | scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD, | |
1451 | SCAN_WILD_CARD, 0); | |
1452 | } | |
1453 | EXPORT_SYMBOL(scsi_scan_host); | |
1454 | ||
1da177e4 LT |
1455 | void scsi_forget_host(struct Scsi_Host *shost) |
1456 | { | |
a64358db | 1457 | struct scsi_device *sdev; |
1da177e4 LT |
1458 | unsigned long flags; |
1459 | ||
a64358db | 1460 | restart: |
1da177e4 | 1461 | spin_lock_irqsave(shost->host_lock, flags); |
a64358db AS |
1462 | list_for_each_entry(sdev, &shost->__devices, siblings) { |
1463 | if (sdev->sdev_state == SDEV_DEL) | |
1464 | continue; | |
1da177e4 | 1465 | spin_unlock_irqrestore(shost->host_lock, flags); |
a64358db AS |
1466 | __scsi_remove_device(sdev); |
1467 | goto restart; | |
1da177e4 LT |
1468 | } |
1469 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1470 | } | |
1471 | ||
1472 | /* | |
1473 | * Function: scsi_get_host_dev() | |
1474 | * | |
f64a181d | 1475 | * Purpose: Create a scsi_device that points to the host adapter itself. |
1da177e4 | 1476 | * |
f64a181d | 1477 | * Arguments: SHpnt - Host that needs a scsi_device |
1da177e4 LT |
1478 | * |
1479 | * Lock status: None assumed. | |
1480 | * | |
f64a181d | 1481 | * Returns: The scsi_device or NULL |
1da177e4 LT |
1482 | * |
1483 | * Notes: | |
f64a181d | 1484 | * Attach a single scsi_device to the Scsi_Host - this should |
1da177e4 LT |
1485 | * be made to look like a "pseudo-device" that points to the |
1486 | * HA itself. | |
1487 | * | |
1488 | * Note - this device is not accessible from any high-level | |
1489 | * drivers (including generics), which is probably not | |
1490 | * optimal. We can add hooks later to attach | |
1491 | */ | |
1492 | struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost) | |
1493 | { | |
e517d313 | 1494 | struct scsi_device *sdev = NULL; |
1da177e4 LT |
1495 | struct scsi_target *starget; |
1496 | ||
0b950672 | 1497 | mutex_lock(&shost->scan_mutex); |
e517d313 AS |
1498 | if (!scsi_host_scan_allowed(shost)) |
1499 | goto out; | |
1da177e4 LT |
1500 | starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id); |
1501 | if (!starget) | |
e517d313 | 1502 | goto out; |
1da177e4 LT |
1503 | |
1504 | sdev = scsi_alloc_sdev(starget, 0, NULL); | |
1505 | if (sdev) { | |
1506 | sdev->sdev_gendev.parent = get_device(&starget->dev); | |
1507 | sdev->borken = 0; | |
1508 | } | |
1509 | put_device(&starget->dev); | |
e517d313 | 1510 | out: |
0b950672 | 1511 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
1512 | return sdev; |
1513 | } | |
1514 | EXPORT_SYMBOL(scsi_get_host_dev); | |
1515 | ||
1516 | /* | |
1517 | * Function: scsi_free_host_dev() | |
1518 | * | |
1519 | * Purpose: Free a scsi_device that points to the host adapter itself. | |
1520 | * | |
f64a181d | 1521 | * Arguments: SHpnt - Host that needs a scsi_device |
1da177e4 LT |
1522 | * |
1523 | * Lock status: None assumed. | |
1524 | * | |
1525 | * Returns: Nothing | |
1526 | * | |
1527 | * Notes: | |
1528 | */ | |
1529 | void scsi_free_host_dev(struct scsi_device *sdev) | |
1530 | { | |
1531 | BUG_ON(sdev->id != sdev->host->this_id); | |
1532 | ||
6f3a2024 | 1533 | scsi_destroy_sdev(sdev); |
1da177e4 LT |
1534 | } |
1535 | EXPORT_SYMBOL(scsi_free_host_dev); | |
1536 |