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