1 /*
2 * scsi_scan.c
3 *
4 * Copyright (C) 2000 Eric Youngdale,
5 * Copyright (C) 2002 Patrick Mansfield
6 *
7 * The general scanning/probing algorithm is as follows, exceptions are
8 * made to it depending on device specific flags, compilation options, and
9 * global variable (boot or module load time) settings.
10 *
11 * A specific LUN is scanned via an INQUIRY command; if the LUN has a
12 * device attached, a Scsi_Device is allocated and setup for it.
13 *
14 * For every id of every channel on the given host:
15 *
16 * Scan LUN 0; if the target responds to LUN 0 (even if there is no
17 * device or storage attached to LUN 0):
18 *
19 * If LUN 0 has a device attached, allocate and setup a
20 * Scsi_Device for it.
21 *
22 * If target is SCSI-3 or up, issue a REPORT LUN, and scan
23 * all of the LUNs returned by the REPORT LUN; else,
24 * sequentially scan LUNs up until some maximum is reached,
25 * or a LUN is seen that cannot have a device attached to it.
26 */
27
28 #include <linux/config.h>
29 #include <linux/module.h>
30 #include <linux/moduleparam.h>
31 #include <linux/init.h>
32 #include <linux/blkdev.h>
33 #include <asm/semaphore.h>
34
35 #include <scsi/scsi.h>
36 #include <scsi/scsi_device.h>
37 #include <scsi/scsi_driver.h>
38 #include <scsi/scsi_devinfo.h>
39 #include <scsi/scsi_host.h>
40 #include <scsi/scsi_request.h>
41 #include <scsi/scsi_transport.h>
42 #include <scsi/scsi_eh.h>
43
44 #include "scsi_priv.h"
45 #include "scsi_logging.h"
46
47 #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
48 " SCSI scanning, some SCSI devices might not be configured\n"
49
50 /*
51 * Default timeout
52 */
53 #define SCSI_TIMEOUT (2*HZ)
54
55 /*
56 * Prefix values for the SCSI id's (stored in driverfs name field)
57 */
58 #define SCSI_UID_SER_NUM 'S'
59 #define SCSI_UID_UNKNOWN 'Z'
60
61 /*
62 * Return values of some of the scanning functions.
63 *
64 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
65 * includes allocation or general failures preventing IO from being sent.
66 *
67 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
68 * on the given LUN.
69 *
70 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
71 * given LUN.
72 */
73 #define SCSI_SCAN_NO_RESPONSE 0
74 #define SCSI_SCAN_TARGET_PRESENT 1
75 #define SCSI_SCAN_LUN_PRESENT 2
76
77 static char *scsi_null_device_strs = "nullnullnullnull";
78
79 #define MAX_SCSI_LUNS 512
80
81 #ifdef CONFIG_SCSI_MULTI_LUN
82 static unsigned int max_scsi_luns = MAX_SCSI_LUNS;
83 #else
84 static unsigned int max_scsi_luns = 1;
85 #endif
86
87 module_param_named(max_luns, max_scsi_luns, int, S_IRUGO|S_IWUSR);
88 MODULE_PARM_DESC(max_luns,
89 "last scsi LUN (should be between 1 and 2^32-1)");
90
91 /*
92 * max_scsi_report_luns: the maximum number of LUNS that will be
93 * returned from the REPORT LUNS command. 8 times this value must
94 * be allocated. In theory this could be up to an 8 byte value, but
95 * in practice, the maximum number of LUNs suppored by any device
96 * is about 16k.
97 */
98 static unsigned int max_scsi_report_luns = 511;
99
100 module_param_named(max_report_luns, max_scsi_report_luns, int, S_IRUGO|S_IWUSR);
101 MODULE_PARM_DESC(max_report_luns,
102 "REPORT LUNS maximum number of LUNS received (should be"
103 " between 1 and 16384)");
104
105 static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+3;
106
107 module_param_named(inq_timeout, scsi_inq_timeout, int, S_IRUGO|S_IWUSR);
108 MODULE_PARM_DESC(inq_timeout,
109 "Timeout (in seconds) waiting for devices to answer INQUIRY."
110 " Default is 5. Some non-compliant devices need more.");
111
112 /**
113 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
114 * @sreq: used to send the command
115 * @result: area to store the result of the MODE SENSE
116 *
117 * Description:
118 * Send a vendor specific MODE SENSE (not a MODE SELECT) command using
119 * @sreq to unlock a device, storing the (unused) results into result.
120 * Called for BLIST_KEY devices.
121 **/
122 static void scsi_unlock_floptical(struct scsi_request *sreq,
123 unsigned char *result)
124 {
125 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
126
127 printk(KERN_NOTICE "scsi: unlocking floptical drive\n");
128 scsi_cmd[0] = MODE_SENSE;
129 scsi_cmd[1] = 0;
130 scsi_cmd[2] = 0x2e;
131 scsi_cmd[3] = 0;
132 scsi_cmd[4] = 0x2a; /* size */
133 scsi_cmd[5] = 0;
134 sreq->sr_cmd_len = 0;
135 sreq->sr_data_direction = DMA_FROM_DEVICE;
136 scsi_wait_req(sreq, scsi_cmd, result, 0x2a /* size */, SCSI_TIMEOUT, 3);
137 }
138
139 /**
140 * print_inquiry - printk the inquiry information
141 * @inq_result: printk this SCSI INQUIRY
142 *
143 * Description:
144 * printk the vendor, model, and other information found in the
145 * INQUIRY data in @inq_result.
146 *
147 * Notes:
148 * Remove this, and replace with a hotplug event that logs any
149 * relevant information.
150 **/
151 static void print_inquiry(unsigned char *inq_result)
152 {
153 int i;
154
155 printk(KERN_NOTICE " Vendor: ");
156 for (i = 8; i < 16; i++)
157 if (inq_result[i] >= 0x20 && i < inq_result[4] + 5)
158 printk("%c", inq_result[i]);
159 else
160 printk(" ");
161
162 printk(" Model: ");
163 for (i = 16; i < 32; i++)
164 if (inq_result[i] >= 0x20 && i < inq_result[4] + 5)
165 printk("%c", inq_result[i]);
166 else
167 printk(" ");
168
169 printk(" Rev: ");
170 for (i = 32; i < 36; i++)
171 if (inq_result[i] >= 0x20 && i < inq_result[4] + 5)
172 printk("%c", inq_result[i]);
173 else
174 printk(" ");
175
176 printk("\n");
177
178 i = inq_result[0] & 0x1f;
179
180 printk(KERN_NOTICE " Type: %s ",
181 i <
182 MAX_SCSI_DEVICE_CODE ? scsi_device_types[i] :
183 "Unknown ");
184 printk(" ANSI SCSI revision: %02x",
185 inq_result[2] & 0x07);
186 if ((inq_result[2] & 0x07) == 1 && (inq_result[3] & 0x0f) == 1)
187 printk(" CCS\n");
188 else
189 printk("\n");
190 }
191
192 /**
193 * scsi_alloc_sdev - allocate and setup a scsi_Device
194 *
195 * Description:
196 * Allocate, initialize for io, and return a pointer to a scsi_Device.
197 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
198 * adds scsi_Device to the appropriate list.
199 *
200 * Return value:
201 * scsi_Device pointer, or NULL on failure.
202 **/
203 static struct scsi_device *scsi_alloc_sdev(struct Scsi_Host *shost,
204 uint channel, uint id, uint lun, void *hostdata)
205 {
206 struct scsi_device *sdev;
207 unsigned long flags;
208 int display_failure_msg = 1, ret;
209
210 sdev = kmalloc(sizeof(*sdev) + shost->transportt->device_size,
211 GFP_ATOMIC);
212 if (!sdev)
213 goto out;
214
215 memset(sdev, 0, sizeof(*sdev));
216 sdev->vendor = scsi_null_device_strs;
217 sdev->model = scsi_null_device_strs;
218 sdev->rev = scsi_null_device_strs;
219 sdev->host = shost;
220 sdev->id = id;
221 sdev->lun = lun;
222 sdev->channel = channel;
223 sdev->sdev_state = SDEV_CREATED;
224 INIT_LIST_HEAD(&sdev->siblings);
225 INIT_LIST_HEAD(&sdev->same_target_siblings);
226 INIT_LIST_HEAD(&sdev->cmd_list);
227 INIT_LIST_HEAD(&sdev->starved_entry);
228 spin_lock_init(&sdev->list_lock);
229
230 /* 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
249 spin_lock_init(&sdev->sdev_lock);
250 sdev->request_queue = scsi_alloc_queue(sdev);
251 if (!sdev->request_queue)
252 goto out_free_dev;
253
254 sdev->request_queue->queuedata = sdev;
255 scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
256
257 scsi_sysfs_device_initialize(sdev);
258
259 if (shost->hostt->slave_alloc) {
260 ret = shost->hostt->slave_alloc(sdev);
261 if (ret) {
262 /*
263 * if LLDD reports slave not present, don't clutter
264 * console with alloc failure messages
265 */
266 if (ret == -ENXIO)
267 display_failure_msg = 0;
268 goto out_device_destroy;
269 }
270 }
271
272 /* NOTE: this target initialisation code depends critically on
273 * lun scanning being sequential. */
274 if (scsi_sysfs_target_initialize(sdev))
275 goto out_remove_siblings;
276
277 return sdev;
278
279 out_remove_siblings:
280 spin_lock_irqsave(shost->host_lock, flags);
281 list_del(&sdev->siblings);
282 list_del(&sdev->same_target_siblings);
283 spin_unlock_irqrestore(shost->host_lock, flags);
284
285 if (shost->hostt->slave_destroy)
286 shost->hostt->slave_destroy(sdev);
287 out_device_destroy:
288 transport_destroy_device(&sdev->sdev_gendev);
289 scsi_free_queue(sdev->request_queue);
290 out_free_dev:
291 kfree(sdev);
292 out:
293 if (display_failure_msg)
294 printk(ALLOC_FAILURE_MSG, __FUNCTION__);
295 return NULL;
296 }
297
298 /**
299 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
300 * @sreq: used to send the INQUIRY
301 * @inq_result: area to store the INQUIRY result
302 * @bflags: store any bflags found here
303 *
304 * Description:
305 * Probe the lun associated with @sreq using a standard SCSI INQUIRY;
306 *
307 * If the INQUIRY is successful, sreq->sr_result is zero and: the
308 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
309 * are copied to the Scsi_Device at @sreq->sr_device (sdev);
310 * any flags value is stored in *@bflags.
311 **/
312 static void scsi_probe_lun(struct scsi_request *sreq, char *inq_result,
313 int *bflags)
314 {
315 struct scsi_device *sdev = sreq->sr_device; /* a bit ugly */
316 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
317 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
318 int response_len = 0;
319 int pass, count;
320 struct scsi_sense_hdr sshdr;
321
322 *bflags = 0;
323
324 /* Perform up to 3 passes. The first pass uses a conservative
325 * transfer length of 36 unless sdev->inquiry_len specifies a
326 * different value. */
327 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
328 try_inquiry_len = first_inquiry_len;
329 pass = 1;
330
331 next_pass:
332 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY pass %d "
333 "to host %d channel %d id %d lun %d, length %d\n",
334 pass, sdev->host->host_no, sdev->channel,
335 sdev->id, sdev->lun, try_inquiry_len));
336
337 /* Each pass gets up to three chances to ignore Unit Attention */
338 for (count = 0; count < 3; ++count) {
339 memset(scsi_cmd, 0, 6);
340 scsi_cmd[0] = INQUIRY;
341 scsi_cmd[4] = (unsigned char) try_inquiry_len;
342 sreq->sr_cmd_len = 0;
343 sreq->sr_data_direction = DMA_FROM_DEVICE;
344
345 memset(inq_result, 0, try_inquiry_len);
346 scsi_wait_req(sreq, (void *) scsi_cmd, (void *) inq_result,
347 try_inquiry_len,
348 HZ/2 + HZ*scsi_inq_timeout, 3);
349
350 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
351 "with code 0x%x\n",
352 sreq->sr_result ? "failed" : "successful",
353 sreq->sr_result));
354
355 if (sreq->sr_result) {
356 /*
357 * not-ready to ready transition [asc/ascq=0x28/0x0]
358 * or power-on, reset [asc/ascq=0x29/0x0], continue.
359 * INQUIRY should not yield UNIT_ATTENTION
360 * but many buggy devices do so anyway.
361 */
362 if ((driver_byte(sreq->sr_result) & DRIVER_SENSE) &&
363 scsi_request_normalize_sense(sreq, &sshdr)) {
364 if ((sshdr.sense_key == UNIT_ATTENTION) &&
365 ((sshdr.asc == 0x28) ||
366 (sshdr.asc == 0x29)) &&
367 (sshdr.ascq == 0))
368 continue;
369 }
370 }
371 break;
372 }
373
374 if (sreq->sr_result == 0) {
375 response_len = (unsigned char) inq_result[4] + 5;
376 if (response_len > 255)
377 response_len = first_inquiry_len; /* sanity */
378
379 /*
380 * Get any flags for this device.
381 *
382 * XXX add a bflags to Scsi_Device, and replace the
383 * corresponding bit fields in Scsi_Device, so bflags
384 * need not be passed as an argument.
385 */
386 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
387 &inq_result[16]);
388
389 /* When the first pass succeeds we gain information about
390 * what larger transfer lengths might work. */
391 if (pass == 1) {
392 if (BLIST_INQUIRY_36 & *bflags)
393 next_inquiry_len = 36;
394 else if (BLIST_INQUIRY_58 & *bflags)
395 next_inquiry_len = 58;
396 else if (sdev->inquiry_len)
397 next_inquiry_len = sdev->inquiry_len;
398 else
399 next_inquiry_len = response_len;
400
401 /* If more data is available perform the second pass */
402 if (next_inquiry_len > try_inquiry_len) {
403 try_inquiry_len = next_inquiry_len;
404 pass = 2;
405 goto next_pass;
406 }
407 }
408
409 } else if (pass == 2) {
410 printk(KERN_INFO "scsi scan: %d byte inquiry failed. "
411 "Consider BLIST_INQUIRY_36 for this device\n",
412 try_inquiry_len);
413
414 /* If this pass failed, the third pass goes back and transfers
415 * the same amount as we successfully got in the first pass. */
416 try_inquiry_len = first_inquiry_len;
417 pass = 3;
418 goto next_pass;
419 }
420
421 /* If the last transfer attempt got an error, assume the
422 * peripheral doesn't exist or is dead. */
423 if (sreq->sr_result)
424 return;
425
426 /* Don't report any more data than the device says is valid */
427 sdev->inquiry_len = min(try_inquiry_len, response_len);
428
429 /*
430 * XXX Abort if the response length is less than 36? If less than
431 * 32, the lookup of the device flags (above) could be invalid,
432 * and it would be possible to take an incorrect action - we do
433 * not want to hang because of a short INQUIRY. On the flip side,
434 * if the device is spun down or becoming ready (and so it gives a
435 * short INQUIRY), an abort here prevents any further use of the
436 * device, including spin up.
437 *
438 * Related to the above issue:
439 *
440 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
441 * and if not ready, sent a START_STOP to start (maybe spin up) and
442 * then send the INQUIRY again, since the INQUIRY can change after
443 * a device is initialized.
444 *
445 * Ideally, start a device if explicitly asked to do so. This
446 * assumes that a device is spun up on power on, spun down on
447 * request, and then spun up on request.
448 */
449
450 /*
451 * The scanning code needs to know the scsi_level, even if no
452 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
453 * non-zero LUNs can be scanned.
454 */
455 sdev->scsi_level = inq_result[2] & 0x07;
456 if (sdev->scsi_level >= 2 ||
457 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
458 sdev->scsi_level++;
459
460 return;
461 }
462
463 /**
464 * scsi_add_lun - allocate and fully initialze a Scsi_Device
465 * @sdevscan: holds information to be stored in the new Scsi_Device
466 * @sdevnew: store the address of the newly allocated Scsi_Device
467 * @inq_result: holds the result of a previous INQUIRY to the LUN
468 * @bflags: black/white list flag
469 *
470 * Description:
471 * Allocate and initialize a Scsi_Device matching sdevscan. Optionally
472 * set fields based on values in *@bflags. If @sdevnew is not
473 * NULL, store the address of the new Scsi_Device in *@sdevnew (needed
474 * when scanning a particular LUN).
475 *
476 * Return:
477 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a Scsi_Device
478 * SCSI_SCAN_LUN_PRESENT: a new Scsi_Device was allocated and initialized
479 **/
480 static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags)
481 {
482 /*
483 * XXX do not save the inquiry, since it can change underneath us,
484 * save just vendor/model/rev.
485 *
486 * Rather than save it and have an ioctl that retrieves the saved
487 * value, have an ioctl that executes the same INQUIRY code used
488 * in scsi_probe_lun, let user level programs doing INQUIRY
489 * scanning run at their own risk, or supply a user level program
490 * that can correctly scan.
491 */
492 sdev->inquiry = kmalloc(sdev->inquiry_len, GFP_ATOMIC);
493 if (sdev->inquiry == NULL) {
494 return SCSI_SCAN_NO_RESPONSE;
495 }
496
497 memcpy(sdev->inquiry, inq_result, sdev->inquiry_len);
498 sdev->vendor = (char *) (sdev->inquiry + 8);
499 sdev->model = (char *) (sdev->inquiry + 16);
500 sdev->rev = (char *) (sdev->inquiry + 32);
501
502 if (*bflags & BLIST_ISROM) {
503 /*
504 * It would be better to modify sdev->type, and set
505 * sdev->removable, but then the print_inquiry() output
506 * would not show TYPE_ROM; if print_inquiry() is removed
507 * the issue goes away.
508 */
509 inq_result[0] = TYPE_ROM;
510 inq_result[1] |= 0x80; /* removable */
511 } else if (*bflags & BLIST_NO_ULD_ATTACH)
512 sdev->no_uld_attach = 1;
513
514 switch (sdev->type = (inq_result[0] & 0x1f)) {
515 case TYPE_TAPE:
516 case TYPE_DISK:
517 case TYPE_PRINTER:
518 case TYPE_MOD:
519 case TYPE_PROCESSOR:
520 case TYPE_SCANNER:
521 case TYPE_MEDIUM_CHANGER:
522 case TYPE_ENCLOSURE:
523 case TYPE_COMM:
524 sdev->writeable = 1;
525 break;
526 case TYPE_WORM:
527 case TYPE_ROM:
528 sdev->writeable = 0;
529 break;
530 default:
531 printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type);
532 }
533
534 print_inquiry(inq_result);
535
536 /*
537 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
538 * spec says: The device server is capable of supporting the
539 * specified peripheral device type on this logical unit. However,
540 * the physical device is not currently connected to this logical
541 * unit.
542 *
543 * The above is vague, as it implies that we could treat 001 and
544 * 011 the same. Stay compatible with previous code, and create a
545 * Scsi_Device for a PQ of 1
546 *
547 * Don't set the device offline here; rather let the upper
548 * level drivers eval the PQ to decide whether they should
549 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
550 */
551
552 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
553 sdev->removable = (0x80 & inq_result[1]) >> 7;
554 sdev->lockable = sdev->removable;
555 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
556
557 if (sdev->scsi_level >= SCSI_3 || (sdev->inquiry_len > 56 &&
558 inq_result[56] & 0x04))
559 sdev->ppr = 1;
560 if (inq_result[7] & 0x60)
561 sdev->wdtr = 1;
562 if (inq_result[7] & 0x10)
563 sdev->sdtr = 1;
564
565 sprintf(sdev->devfs_name, "scsi/host%d/bus%d/target%d/lun%d",
566 sdev->host->host_no, sdev->channel,
567 sdev->id, sdev->lun);
568
569 /*
570 * End driverfs/devfs code.
571 */
572
573 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
574 !(*bflags & BLIST_NOTQ))
575 sdev->tagged_supported = 1;
576 /*
577 * Some devices (Texel CD ROM drives) have handshaking problems
578 * when used with the Seagate controllers. borken is initialized
579 * to 1, and then set it to 0 here.
580 */
581 if ((*bflags & BLIST_BORKEN) == 0)
582 sdev->borken = 0;
583
584 /*
585 * Apparently some really broken devices (contrary to the SCSI
586 * standards) need to be selected without asserting ATN
587 */
588 if (*bflags & BLIST_SELECT_NO_ATN)
589 sdev->select_no_atn = 1;
590
591 /*
592 * Some devices may not want to have a start command automatically
593 * issued when a device is added.
594 */
595 if (*bflags & BLIST_NOSTARTONADD)
596 sdev->no_start_on_add = 1;
597
598 if (*bflags & BLIST_SINGLELUN)
599 sdev->single_lun = 1;
600
601
602 sdev->use_10_for_rw = 1;
603
604 if (*bflags & BLIST_MS_SKIP_PAGE_08)
605 sdev->skip_ms_page_8 = 1;
606
607 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
608 sdev->skip_ms_page_3f = 1;
609
610 if (*bflags & BLIST_USE_10_BYTE_MS)
611 sdev->use_10_for_ms = 1;
612
613 /* set the device running here so that slave configure
614 * may do I/O */
615 scsi_device_set_state(sdev, SDEV_RUNNING);
616
617 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
618 sdev->use_192_bytes_for_3f = 1;
619
620 if (*bflags & BLIST_NOT_LOCKABLE)
621 sdev->lockable = 0;
622
623 transport_configure_device(&sdev->sdev_gendev);
624
625 if (sdev->host->hostt->slave_configure)
626 sdev->host->hostt->slave_configure(sdev);
627
628 /*
629 * Ok, the device is now all set up, we can
630 * register it and tell the rest of the kernel
631 * about it.
632 */
633 scsi_sysfs_add_sdev(sdev);
634
635 return SCSI_SCAN_LUN_PRESENT;
636 }
637
638 /**
639 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
640 * @sdevscan: probe the LUN corresponding to this Scsi_Device
641 * @sdevnew: store the value of any new Scsi_Device allocated
642 * @bflagsp: store bflags here if not NULL
643 *
644 * Description:
645 * Call scsi_probe_lun, if a LUN with an attached device is found,
646 * allocate and set it up by calling scsi_add_lun.
647 *
648 * Return:
649 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a Scsi_Device
650 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
651 * attached at the LUN
652 * SCSI_SCAN_LUN_PRESENT: a new Scsi_Device was allocated and initialized
653 **/
654 static int scsi_probe_and_add_lun(struct Scsi_Host *host,
655 uint channel, uint id, uint lun, int *bflagsp,
656 struct scsi_device **sdevp, int rescan, void *hostdata)
657 {
658 struct scsi_device *sdev;
659 struct scsi_request *sreq;
660 unsigned char *result;
661 int bflags, res = SCSI_SCAN_NO_RESPONSE;
662
663 /*
664 * The rescan flag is used as an optimization, the first scan of a
665 * host adapter calls into here with rescan == 0.
666 */
667 if (rescan) {
668 sdev = scsi_device_lookup(host, channel, id, lun);
669 if (sdev) {
670 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
671 "scsi scan: device exists on <%d:%d:%d:%d>\n",
672 host->host_no, channel, id, lun));
673 if (sdevp)
674 *sdevp = sdev;
675 if (bflagsp)
676 *bflagsp = scsi_get_device_flags(sdev,
677 sdev->vendor,
678 sdev->model);
679 /* XXX: bandaid until callers do refcounting */
680 scsi_device_put(sdev);
681 return SCSI_SCAN_LUN_PRESENT;
682 }
683 }
684
685 sdev = scsi_alloc_sdev(host, channel, id, lun, hostdata);
686 if (!sdev)
687 goto out;
688 sreq = scsi_allocate_request(sdev, GFP_ATOMIC);
689 if (!sreq)
690 goto out_free_sdev;
691 result = kmalloc(256, GFP_ATOMIC |
692 (host->unchecked_isa_dma) ? __GFP_DMA : 0);
693 if (!result)
694 goto out_free_sreq;
695
696 scsi_probe_lun(sreq, result, &bflags);
697 if (sreq->sr_result)
698 goto out_free_result;
699
700 /*
701 * result contains valid SCSI INQUIRY data.
702 */
703 if ((result[0] >> 5) == 3) {
704 /*
705 * For a Peripheral qualifier 3 (011b), the SCSI
706 * spec says: The device server is not capable of
707 * supporting a physical device on this logical
708 * unit.
709 *
710 * For disks, this implies that there is no
711 * logical disk configured at sdev->lun, but there
712 * is a target id responding.
713 */
714 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
715 "scsi scan: peripheral qualifier of 3,"
716 " no device added\n"));
717 res = SCSI_SCAN_TARGET_PRESENT;
718 goto out_free_result;
719 }
720
721 res = scsi_add_lun(sdev, result, &bflags);
722 if (res == SCSI_SCAN_LUN_PRESENT) {
723 if (bflags & BLIST_KEY) {
724 sdev->lockable = 0;
725 scsi_unlock_floptical(sreq, result);
726 }
727 if (bflagsp)
728 *bflagsp = bflags;
729 }
730
731 out_free_result:
732 kfree(result);
733 out_free_sreq:
734 scsi_release_request(sreq);
735 out_free_sdev:
736 if (res == SCSI_SCAN_LUN_PRESENT) {
737 if (sdevp)
738 *sdevp = sdev;
739 } else {
740 if (sdev->host->hostt->slave_destroy)
741 sdev->host->hostt->slave_destroy(sdev);
742 transport_destroy_device(&sdev->sdev_gendev);
743 put_device(&sdev->sdev_gendev);
744 }
745 out:
746 return res;
747 }
748
749 /**
750 * scsi_sequential_lun_scan - sequentially scan a SCSI target
751 * @sdevscan: scan the host, channel, and id of this Scsi_Device
752 * @bflags: black/white list flag for LUN 0
753 * @lun0_res: result of scanning LUN 0
754 *
755 * Description:
756 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
757 * scanned) to some maximum lun until a LUN is found with no device
758 * attached. Use the bflags to figure out any oddities.
759 *
760 * Modifies sdevscan->lun.
761 **/
762 static void scsi_sequential_lun_scan(struct Scsi_Host *shost, uint channel,
763 uint id, int bflags, int lun0_res, int scsi_level, int rescan)
764 {
765 unsigned int sparse_lun, lun, max_dev_lun;
766
767 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of"
768 " host %d channel %d id %d\n", shost->host_no,
769 channel, id));
770
771 max_dev_lun = min(max_scsi_luns, shost->max_lun);
772 /*
773 * If this device is known to support sparse multiple units,
774 * override the other settings, and scan all of them. Normally,
775 * SCSI-3 devices should be scanned via the REPORT LUNS.
776 */
777 if (bflags & BLIST_SPARSELUN) {
778 max_dev_lun = shost->max_lun;
779 sparse_lun = 1;
780 } else
781 sparse_lun = 0;
782
783 /*
784 * If not sparse lun and no device attached at LUN 0 do not scan
785 * any further.
786 */
787 if (!sparse_lun && (lun0_res != SCSI_SCAN_LUN_PRESENT))
788 return;
789
790 /*
791 * If less than SCSI_1_CSS, and no special lun scaning, stop
792 * scanning; this matches 2.4 behaviour, but could just be a bug
793 * (to continue scanning a SCSI_1_CSS device).
794 *
795 * This test is broken. We might not have any device on lun0 for
796 * a sparselun device, and if that's the case then how would we
797 * know the real scsi_level, eh? It might make sense to just not
798 * scan any SCSI_1 device for non-0 luns, but that check would best
799 * go into scsi_alloc_sdev() and just have it return null when asked
800 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
801 *
802 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
803 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
804 == 0))
805 return;
806 */
807 /*
808 * If this device is known to support multiple units, override
809 * the other settings, and scan all of them.
810 */
811 if (bflags & BLIST_FORCELUN)
812 max_dev_lun = shost->max_lun;
813 /*
814 * REGAL CDC-4X: avoid hang after LUN 4
815 */
816 if (bflags & BLIST_MAX5LUN)
817 max_dev_lun = min(5U, max_dev_lun);
818 /*
819 * Do not scan SCSI-2 or lower device past LUN 7, unless
820 * BLIST_LARGELUN.
821 */
822 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
823 max_dev_lun = min(8U, max_dev_lun);
824
825 /*
826 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
827 * until we reach the max, or no LUN is found and we are not
828 * sparse_lun.
829 */
830 for (lun = 1; lun < max_dev_lun; ++lun)
831 if ((scsi_probe_and_add_lun(shost, channel, id, lun,
832 NULL, NULL, rescan, NULL) != SCSI_SCAN_LUN_PRESENT) &&
833 !sparse_lun)
834 return;
835 }
836
837 /**
838 * scsilun_to_int: convert a scsi_lun to an int
839 * @scsilun: struct scsi_lun to be converted.
840 *
841 * Description:
842 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
843 * integer, and return the result. The caller must check for
844 * truncation before using this function.
845 *
846 * Notes:
847 * The struct scsi_lun is assumed to be four levels, with each level
848 * effectively containing a SCSI byte-ordered (big endian) short; the
849 * addressing bits of each level are ignored (the highest two bits).
850 * For a description of the LUN format, post SCSI-3 see the SCSI
851 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
852 *
853 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
854 * the integer: 0x0b030a04
855 **/
856 static int scsilun_to_int(struct scsi_lun *scsilun)
857 {
858 int i;
859 unsigned int lun;
860
861 lun = 0;
862 for (i = 0; i < sizeof(lun); i += 2)
863 lun = lun | (((scsilun->scsi_lun[i] << 8) |
864 scsilun->scsi_lun[i + 1]) << (i * 8));
865 return lun;
866 }
867
868 /**
869 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
870 * @sdevscan: scan the host, channel, and id of this Scsi_Device
871 *
872 * Description:
873 * If @sdevscan is for a SCSI-3 or up device, send a REPORT LUN
874 * command, and scan the resulting list of LUNs by calling
875 * scsi_probe_and_add_lun.
876 *
877 * Modifies sdevscan->lun.
878 *
879 * Return:
880 * 0: scan completed (or no memory, so further scanning is futile)
881 * 1: no report lun scan, or not configured
882 **/
883 static int scsi_report_lun_scan(struct scsi_device *sdev, int bflags,
884 int rescan)
885 {
886 char devname[64];
887 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
888 unsigned int length;
889 unsigned int lun;
890 unsigned int num_luns;
891 unsigned int retries;
892 struct scsi_lun *lunp, *lun_data;
893 struct scsi_request *sreq;
894 u8 *data;
895 struct scsi_sense_hdr sshdr;
896
897 /*
898 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
899 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
900 * support more than 8 LUNs.
901 */
902 if ((bflags & BLIST_NOREPORTLUN) ||
903 sdev->scsi_level < SCSI_2 ||
904 (sdev->scsi_level < SCSI_3 &&
905 (!(bflags & BLIST_REPORTLUN2) || sdev->host->max_lun <= 8)) )
906 return 1;
907 if (bflags & BLIST_NOLUN)
908 return 0;
909
910 sreq = scsi_allocate_request(sdev, GFP_ATOMIC);
911 if (!sreq)
912 goto out;
913
914 sprintf(devname, "host %d channel %d id %d",
915 sdev->host->host_no, sdev->channel, sdev->id);
916
917 /*
918 * Allocate enough to hold the header (the same size as one scsi_lun)
919 * plus the max number of luns we are requesting.
920 *
921 * Reallocating and trying again (with the exact amount we need)
922 * would be nice, but then we need to somehow limit the size
923 * allocated based on the available memory and the limits of
924 * kmalloc - we don't want a kmalloc() failure of a huge value to
925 * prevent us from finding any LUNs on this target.
926 */
927 length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun);
928 lun_data = kmalloc(length, GFP_ATOMIC |
929 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
930 if (!lun_data)
931 goto out_release_request;
932
933 scsi_cmd[0] = REPORT_LUNS;
934
935 /*
936 * bytes 1 - 5: reserved, set to zero.
937 */
938 memset(&scsi_cmd[1], 0, 5);
939
940 /*
941 * bytes 6 - 9: length of the command.
942 */
943 scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff;
944 scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff;
945 scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff;
946 scsi_cmd[9] = (unsigned char) length & 0xff;
947
948 scsi_cmd[10] = 0; /* reserved */
949 scsi_cmd[11] = 0; /* control */
950 sreq->sr_cmd_len = 0;
951 sreq->sr_data_direction = DMA_FROM_DEVICE;
952
953 /*
954 * We can get a UNIT ATTENTION, for example a power on/reset, so
955 * retry a few times (like sd.c does for TEST UNIT READY).
956 * Experience shows some combinations of adapter/devices get at
957 * least two power on/resets.
958 *
959 * Illegal requests (for devices that do not support REPORT LUNS)
960 * should come through as a check condition, and will not generate
961 * a retry.
962 */
963 for (retries = 0; retries < 3; retries++) {
964 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending"
965 " REPORT LUNS to %s (try %d)\n", devname,
966 retries));
967 scsi_wait_req(sreq, scsi_cmd, lun_data, length,
968 SCSI_TIMEOUT + 4*HZ, 3);
969 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS"
970 " %s (try %d) result 0x%x\n", sreq->sr_result
971 ? "failed" : "successful", retries,
972 sreq->sr_result));
973 if (sreq->sr_result == 0)
974 break;
975 else if (scsi_request_normalize_sense(sreq, &sshdr)) {
976 if (sshdr.sense_key != UNIT_ATTENTION)
977 break;
978 }
979 }
980
981 if (sreq->sr_result) {
982 /*
983 * The device probably does not support a REPORT LUN command
984 */
985 kfree(lun_data);
986 scsi_release_request(sreq);
987 return 1;
988 }
989 scsi_release_request(sreq);
990
991 /*
992 * Get the length from the first four bytes of lun_data.
993 */
994 data = (u8 *) lun_data->scsi_lun;
995 length = ((data[0] << 24) | (data[1] << 16) |
996 (data[2] << 8) | (data[3] << 0));
997
998 num_luns = (length / sizeof(struct scsi_lun));
999 if (num_luns > max_scsi_report_luns) {
1000 printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)"
1001 " of %d luns reported, try increasing"
1002 " max_scsi_report_luns.\n", devname,
1003 max_scsi_report_luns, num_luns);
1004 num_luns = max_scsi_report_luns;
1005 }
1006
1007 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUN scan of"
1008 " host %d channel %d id %d\n", sdev->host->host_no,
1009 sdev->channel, sdev->id));
1010
1011 /*
1012 * Scan the luns in lun_data. The entry at offset 0 is really
1013 * the header, so start at 1 and go up to and including num_luns.
1014 */
1015 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1016 lun = scsilun_to_int(lunp);
1017
1018 /*
1019 * Check if the unused part of lunp is non-zero, and so
1020 * does not fit in lun.
1021 */
1022 if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) {
1023 int i;
1024
1025 /*
1026 * Output an error displaying the LUN in byte order,
1027 * this differs from what linux would print for the
1028 * integer LUN value.
1029 */
1030 printk(KERN_WARNING "scsi: %s lun 0x", devname);
1031 data = (char *)lunp->scsi_lun;
1032 for (i = 0; i < sizeof(struct scsi_lun); i++)
1033 printk("%02x", data[i]);
1034 printk(" has a LUN larger than currently supported.\n");
1035 } else if (lun == 0) {
1036 /*
1037 * LUN 0 has already been scanned.
1038 */
1039 } else if (lun > sdev->host->max_lun) {
1040 printk(KERN_WARNING "scsi: %s lun%d has a LUN larger"
1041 " than allowed by the host adapter\n",
1042 devname, lun);
1043 } else {
1044 int res;
1045
1046 res = scsi_probe_and_add_lun(sdev->host, sdev->channel,
1047 sdev->id, lun, NULL, NULL, rescan, NULL);
1048 if (res == SCSI_SCAN_NO_RESPONSE) {
1049 /*
1050 * Got some results, but now none, abort.
1051 */
1052 printk(KERN_ERR "scsi: Unexpected response"
1053 " from %s lun %d while scanning, scan"
1054 " aborted\n", devname, lun);
1055 break;
1056 }
1057 }
1058 }
1059
1060 kfree(lun_data);
1061 return 0;
1062
1063 out_release_request:
1064 scsi_release_request(sreq);
1065 out:
1066 /*
1067 * We are out of memory, don't try scanning any further.
1068 */
1069 printk(ALLOC_FAILURE_MSG, __FUNCTION__);
1070 return 0;
1071 }
1072
1073 struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
1074 uint id, uint lun, void *hostdata)
1075 {
1076 struct scsi_device *sdev;
1077 int res;
1078
1079 down(&shost->scan_mutex);
1080 res = scsi_probe_and_add_lun(shost, channel, id, lun, NULL,
1081 &sdev, 1, hostdata);
1082 if (res != SCSI_SCAN_LUN_PRESENT)
1083 sdev = ERR_PTR(-ENODEV);
1084 up(&shost->scan_mutex);
1085
1086 return sdev;
1087 }
1088 EXPORT_SYMBOL(__scsi_add_device);
1089
1090 void scsi_rescan_device(struct device *dev)
1091 {
1092 struct scsi_driver *drv;
1093
1094 if (!dev->driver)
1095 return;
1096
1097 drv = to_scsi_driver(dev->driver);
1098 if (try_module_get(drv->owner)) {
1099 if (drv->rescan)
1100 drv->rescan(dev);
1101 module_put(drv->owner);
1102 }
1103 }
1104 EXPORT_SYMBOL(scsi_rescan_device);
1105
1106 /**
1107 * scsi_scan_target - scan a target id, possibly including all LUNs on the
1108 * target.
1109 * @sdevsca: Scsi_Device handle for scanning
1110 * @shost: host to scan
1111 * @channel: channel to scan
1112 * @id: target id to scan
1113 *
1114 * Description:
1115 * Scan the target id on @shost, @channel, and @id. Scan at least LUN
1116 * 0, and possibly all LUNs on the target id.
1117 *
1118 * Use the pre-allocated @sdevscan as a handle for the scanning. This
1119 * function sets sdevscan->host, sdevscan->id and sdevscan->lun; the
1120 * scanning functions modify sdevscan->lun.
1121 *
1122 * First try a REPORT LUN scan, if that does not scan the target, do a
1123 * sequential scan of LUNs on the target id.
1124 **/
1125 static void scsi_scan_target(struct Scsi_Host *shost, unsigned int channel,
1126 unsigned int id, unsigned int lun, int rescan)
1127 {
1128 int bflags = 0;
1129 int res;
1130 struct scsi_device *sdev;
1131
1132 if (shost->this_id == id)
1133 /*
1134 * Don't scan the host adapter
1135 */
1136 return;
1137
1138 if (lun != SCAN_WILD_CARD) {
1139 /*
1140 * Scan for a specific host/chan/id/lun.
1141 */
1142 scsi_probe_and_add_lun(shost, channel, id, lun, NULL, NULL,
1143 rescan, NULL);
1144 return;
1145 }
1146
1147 /*
1148 * Scan LUN 0, if there is some response, scan further. Ideally, we
1149 * would not configure LUN 0 until all LUNs are scanned.
1150 */
1151 res = scsi_probe_and_add_lun(shost, channel, id, 0, &bflags, &sdev,
1152 rescan, NULL);
1153 if (res == SCSI_SCAN_LUN_PRESENT) {
1154 if (scsi_report_lun_scan(sdev, bflags, rescan) != 0)
1155 /*
1156 * The REPORT LUN did not scan the target,
1157 * do a sequential scan.
1158 */
1159 scsi_sequential_lun_scan(shost, channel, id, bflags,
1160 res, sdev->scsi_level, rescan);
1161 } else if (res == SCSI_SCAN_TARGET_PRESENT) {
1162 /*
1163 * There's a target here, but lun 0 is offline so we
1164 * can't use the report_lun scan. Fall back to a
1165 * sequential lun scan with a bflags of SPARSELUN and
1166 * a default scsi level of SCSI_2
1167 */
1168 scsi_sequential_lun_scan(shost, channel, id, BLIST_SPARSELUN,
1169 SCSI_SCAN_TARGET_PRESENT, SCSI_2, rescan);
1170 }
1171 }
1172
1173 static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1174 unsigned int id, unsigned int lun, int rescan)
1175 {
1176 uint order_id;
1177
1178 if (id == SCAN_WILD_CARD)
1179 for (id = 0; id < shost->max_id; ++id) {
1180 /*
1181 * XXX adapter drivers when possible (FCP, iSCSI)
1182 * could modify max_id to match the current max,
1183 * not the absolute max.
1184 *
1185 * XXX add a shost id iterator, so for example,
1186 * the FC ID can be the same as a target id
1187 * without a huge overhead of sparse id's.
1188 */
1189 if (shost->reverse_ordering)
1190 /*
1191 * Scan from high to low id.
1192 */
1193 order_id = shost->max_id - id - 1;
1194 else
1195 order_id = id;
1196 scsi_scan_target(shost, channel, order_id, lun, rescan);
1197 }
1198 else
1199 scsi_scan_target(shost, channel, id, lun, rescan);
1200 }
1201
1202 int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1203 unsigned int id, unsigned int lun, int rescan)
1204 {
1205 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "%s: <%u:%u:%u:%u>\n",
1206 __FUNCTION__, shost->host_no, channel, id, lun));
1207
1208 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
1209 ((id != SCAN_WILD_CARD) && (id > shost->max_id)) ||
1210 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1211 return -EINVAL;
1212
1213 down(&shost->scan_mutex);
1214 if (channel == SCAN_WILD_CARD)
1215 for (channel = 0; channel <= shost->max_channel; channel++)
1216 scsi_scan_channel(shost, channel, id, lun, rescan);
1217 else
1218 scsi_scan_channel(shost, channel, id, lun, rescan);
1219 up(&shost->scan_mutex);
1220
1221 return 0;
1222 }
1223
1224 /**
1225 * scsi_scan_host - scan the given adapter
1226 * @shost: adapter to scan
1227 **/
1228 void scsi_scan_host(struct Scsi_Host *shost)
1229 {
1230 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1231 SCAN_WILD_CARD, 0);
1232 }
1233 EXPORT_SYMBOL(scsi_scan_host);
1234
1235 /**
1236 * scsi_scan_single_target - scan the given SCSI target
1237 * @shost: adapter to scan
1238 * @chan: channel to scan
1239 * @id: target id to scan
1240 **/
1241 void scsi_scan_single_target(struct Scsi_Host *shost,
1242 unsigned int chan, unsigned int id)
1243 {
1244 scsi_scan_host_selected(shost, chan, id, SCAN_WILD_CARD, 1);
1245 }
1246 EXPORT_SYMBOL(scsi_scan_single_target);
1247
1248 void scsi_forget_host(struct Scsi_Host *shost)
1249 {
1250 struct scsi_device *sdev, *tmp;
1251 unsigned long flags;
1252
1253 /*
1254 * Ok, this look a bit strange. We always look for the first device
1255 * on the list as scsi_remove_device removes them from it - thus we
1256 * also have to release the lock.
1257 * We don't need to get another reference to the device before
1258 * releasing the lock as we already own the reference from
1259 * scsi_register_device that's release in scsi_remove_device. And
1260 * after that we don't look at sdev anymore.
1261 */
1262 spin_lock_irqsave(shost->host_lock, flags);
1263 list_for_each_entry_safe(sdev, tmp, &shost->__devices, siblings) {
1264 spin_unlock_irqrestore(shost->host_lock, flags);
1265 scsi_remove_device(sdev);
1266 spin_lock_irqsave(shost->host_lock, flags);
1267 }
1268 spin_unlock_irqrestore(shost->host_lock, flags);
1269 }
1270
1271 /*
1272 * Function: scsi_get_host_dev()
1273 *
1274 * Purpose: Create a Scsi_Device that points to the host adapter itself.
1275 *
1276 * Arguments: SHpnt - Host that needs a Scsi_Device
1277 *
1278 * Lock status: None assumed.
1279 *
1280 * Returns: The Scsi_Device or NULL
1281 *
1282 * Notes:
1283 * Attach a single Scsi_Device to the Scsi_Host - this should
1284 * be made to look like a "pseudo-device" that points to the
1285 * HA itself.
1286 *
1287 * Note - this device is not accessible from any high-level
1288 * drivers (including generics), which is probably not
1289 * optimal. We can add hooks later to attach
1290 */
1291 struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1292 {
1293 struct scsi_device *sdev;
1294
1295 sdev = scsi_alloc_sdev(shost, 0, shost->this_id, 0, NULL);
1296 if (sdev) {
1297 sdev->borken = 0;
1298 }
1299 return sdev;
1300 }
1301 EXPORT_SYMBOL(scsi_get_host_dev);
1302
1303 /*
1304 * Function: scsi_free_host_dev()
1305 *
1306 * Purpose: Free a scsi_device that points to the host adapter itself.
1307 *
1308 * Arguments: SHpnt - Host that needs a Scsi_Device
1309 *
1310 * Lock status: None assumed.
1311 *
1312 * Returns: Nothing
1313 *
1314 * Notes:
1315 */
1316 void scsi_free_host_dev(struct scsi_device *sdev)
1317 {
1318 BUG_ON(sdev->id != sdev->host->this_id);
1319
1320 if (sdev->host->hostt->slave_destroy)
1321 sdev->host->hostt->slave_destroy(sdev);
1322 transport_destroy_device(&sdev->sdev_gendev);
1323 put_device(&sdev->sdev_gendev);
1324 }
1325 EXPORT_SYMBOL(scsi_free_host_dev);
1326
1327
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