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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/scsi/scsi_scan.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/scsi/scsi_scan.c')
-rw-r--r--drivers/scsi/scsi_scan.c1473
1 files changed, 1473 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
new file mode 100644
index 000000000000..a8a37a338c02
--- /dev/null
+++ b/drivers/scsi/scsi_scan.c
@@ -0,0 +1,1473 @@
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
77static char *scsi_null_device_strs = "nullnullnullnull";
78
79#define MAX_SCSI_LUNS 512
80
81#ifdef CONFIG_SCSI_MULTI_LUN
82static unsigned int max_scsi_luns = MAX_SCSI_LUNS;
83#else
84static unsigned int max_scsi_luns = 1;
85#endif
86
87module_param_named(max_luns, max_scsi_luns, int, S_IRUGO|S_IWUSR);
88MODULE_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 */
98static unsigned int max_scsi_report_luns = 511;
99
100module_param_named(max_report_luns, max_scsi_report_luns, int, S_IRUGO|S_IWUSR);
101MODULE_PARM_DESC(max_report_luns,
102 "REPORT LUNS maximum number of LUNS received (should be"
103 " between 1 and 16384)");
104
105static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+3;
106
107module_param_named(inq_timeout, scsi_inq_timeout, int, S_IRUGO|S_IWUSR);
108MODULE_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 **/
122static 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 **/
151static 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 **/
203static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
204 unsigned int lun, void *hostdata)
205{
206 struct scsi_device *sdev;
207 int display_failure_msg = 1, ret;
208 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
209
210 sdev = kmalloc(sizeof(*sdev) + shost->transportt->device_size,
211 GFP_ATOMIC);
212 if (!sdev)
213 goto out;
214
215 memset(sdev, 0, sizeof(*sdev));
216 sdev->vendor = scsi_null_device_strs;
217 sdev->model = scsi_null_device_strs;
218 sdev->rev = scsi_null_device_strs;
219 sdev->host = shost;
220 sdev->id = starget->id;
221 sdev->lun = lun;
222 sdev->channel = starget->channel;
223 sdev->sdev_state = SDEV_CREATED;
224 INIT_LIST_HEAD(&sdev->siblings);
225 INIT_LIST_HEAD(&sdev->same_target_siblings);
226 INIT_LIST_HEAD(&sdev->cmd_list);
227 INIT_LIST_HEAD(&sdev->starved_entry);
228 spin_lock_init(&sdev->list_lock);
229
230 sdev->sdev_gendev.parent = get_device(&starget->dev);
231 sdev->sdev_target = starget;
232
233 /* usually NULL and set by ->slave_alloc instead */
234 sdev->hostdata = hostdata;
235
236 /* if the device needs this changing, it may do so in the
237 * slave_configure function */
238 sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
239
240 /*
241 * Some low level driver could use device->type
242 */
243 sdev->type = -1;
244
245 /*
246 * Assume that the device will have handshaking problems,
247 * and then fix this field later if it turns out it
248 * doesn't
249 */
250 sdev->borken = 1;
251
252 spin_lock_init(&sdev->sdev_lock);
253 sdev->request_queue = scsi_alloc_queue(sdev);
254 if (!sdev->request_queue) {
255 /* release fn is set up in scsi_sysfs_device_initialise, so
256 * have to free and put manually here */
257 put_device(&starget->dev);
258 goto out;
259 }
260
261 sdev->request_queue->queuedata = sdev;
262 scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
263
264 scsi_sysfs_device_initialize(sdev);
265
266 if (shost->hostt->slave_alloc) {
267 ret = shost->hostt->slave_alloc(sdev);
268 if (ret) {
269 /*
270 * if LLDD reports slave not present, don't clutter
271 * console with alloc failure messages
272
273
274 */
275 if (ret == -ENXIO)
276 display_failure_msg = 0;
277 goto out_device_destroy;
278 }
279 }
280
281 return sdev;
282
283out_device_destroy:
284 transport_destroy_device(&sdev->sdev_gendev);
285 scsi_free_queue(sdev->request_queue);
286 put_device(&sdev->sdev_gendev);
287out:
288 if (display_failure_msg)
289 printk(ALLOC_FAILURE_MSG, __FUNCTION__);
290 return NULL;
291}
292
293static void scsi_target_dev_release(struct device *dev)
294{
295 struct device *parent = dev->parent;
296 struct scsi_target *starget = to_scsi_target(dev);
297 kfree(starget);
298 put_device(parent);
299}
300
301int scsi_is_target_device(const struct device *dev)
302{
303 return dev->release == scsi_target_dev_release;
304}
305EXPORT_SYMBOL(scsi_is_target_device);
306
307static struct scsi_target *__scsi_find_target(struct device *parent,
308 int channel, uint id)
309{
310 struct scsi_target *starget, *found_starget = NULL;
311 struct Scsi_Host *shost = dev_to_shost(parent);
312 /*
313 * Search for an existing target for this sdev.
314 */
315 list_for_each_entry(starget, &shost->__targets, siblings) {
316 if (starget->id == id &&
317 starget->channel == channel) {
318 found_starget = starget;
319 break;
320 }
321 }
322 if (found_starget)
323 get_device(&found_starget->dev);
324
325 return found_starget;
326}
327
328static struct scsi_target *scsi_alloc_target(struct device *parent,
329 int channel, uint id)
330{
331 struct Scsi_Host *shost = dev_to_shost(parent);
332 struct device *dev = NULL;
333 unsigned long flags;
334 const int size = sizeof(struct scsi_target)
335 + shost->transportt->target_size;
336 struct scsi_target *starget = kmalloc(size, GFP_ATOMIC);
337 struct scsi_target *found_target;
338
339 if (!starget) {
340 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
341 return NULL;
342 }
343 memset(starget, 0, size);
344 dev = &starget->dev;
345 device_initialize(dev);
346 starget->reap_ref = 1;
347 dev->parent = get_device(parent);
348 dev->release = scsi_target_dev_release;
349 sprintf(dev->bus_id, "target%d:%d:%d",
350 shost->host_no, channel, id);
351 starget->id = id;
352 starget->channel = channel;
353 INIT_LIST_HEAD(&starget->siblings);
354 INIT_LIST_HEAD(&starget->devices);
355 spin_lock_irqsave(shost->host_lock, flags);
356
357 found_target = __scsi_find_target(parent, channel, id);
358 if (found_target)
359 goto found;
360
361 list_add_tail(&starget->siblings, &shost->__targets);
362 spin_unlock_irqrestore(shost->host_lock, flags);
363 /* allocate and add */
364 transport_setup_device(&starget->dev);
365 device_add(&starget->dev);
366 transport_add_device(&starget->dev);
367 return starget;
368
369 found:
370 found_target->reap_ref++;
371 spin_unlock_irqrestore(shost->host_lock, flags);
372 put_device(parent);
373 kfree(starget);
374 return found_target;
375}
376
377/**
378 * scsi_target_reap - check to see if target is in use and destroy if not
379 *
380 * @starget: target to be checked
381 *
382 * This is used after removing a LUN or doing a last put of the target
383 * it checks atomically that nothing is using the target and removes
384 * it if so.
385 */
386void scsi_target_reap(struct scsi_target *starget)
387{
388 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
389 unsigned long flags;
390 spin_lock_irqsave(shost->host_lock, flags);
391
392 if (--starget->reap_ref == 0 && list_empty(&starget->devices)) {
393 list_del_init(&starget->siblings);
394 spin_unlock_irqrestore(shost->host_lock, flags);
395 device_del(&starget->dev);
396 transport_unregister_device(&starget->dev);
397 put_device(&starget->dev);
398 return;
399 }
400 spin_unlock_irqrestore(shost->host_lock, flags);
401}
402
403/**
404 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
405 * @sreq: used to send the INQUIRY
406 * @inq_result: area to store the INQUIRY result
407 * @bflags: store any bflags found here
408 *
409 * Description:
410 * Probe the lun associated with @sreq using a standard SCSI INQUIRY;
411 *
412 * If the INQUIRY is successful, sreq->sr_result is zero and: the
413 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
414 * are copied to the Scsi_Device at @sreq->sr_device (sdev);
415 * any flags value is stored in *@bflags.
416 **/
417static void scsi_probe_lun(struct scsi_request *sreq, char *inq_result,
418 int *bflags)
419{
420 struct scsi_device *sdev = sreq->sr_device; /* a bit ugly */
421 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
422 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
423 int response_len = 0;
424 int pass, count;
425 struct scsi_sense_hdr sshdr;
426
427 *bflags = 0;
428
429 /* Perform up to 3 passes. The first pass uses a conservative
430 * transfer length of 36 unless sdev->inquiry_len specifies a
431 * different value. */
432 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
433 try_inquiry_len = first_inquiry_len;
434 pass = 1;
435
436 next_pass:
437 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY pass %d "
438 "to host %d channel %d id %d lun %d, length %d\n",
439 pass, sdev->host->host_no, sdev->channel,
440 sdev->id, sdev->lun, try_inquiry_len));
441
442 /* Each pass gets up to three chances to ignore Unit Attention */
443 for (count = 0; count < 3; ++count) {
444 memset(scsi_cmd, 0, 6);
445 scsi_cmd[0] = INQUIRY;
446 scsi_cmd[4] = (unsigned char) try_inquiry_len;
447 sreq->sr_cmd_len = 0;
448 sreq->sr_data_direction = DMA_FROM_DEVICE;
449
450 memset(inq_result, 0, try_inquiry_len);
451 scsi_wait_req(sreq, (void *) scsi_cmd, (void *) inq_result,
452 try_inquiry_len,
453 HZ/2 + HZ*scsi_inq_timeout, 3);
454
455 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
456 "with code 0x%x\n",
457 sreq->sr_result ? "failed" : "successful",
458 sreq->sr_result));
459
460 if (sreq->sr_result) {
461 /*
462 * not-ready to ready transition [asc/ascq=0x28/0x0]
463 * or power-on, reset [asc/ascq=0x29/0x0], continue.
464 * INQUIRY should not yield UNIT_ATTENTION
465 * but many buggy devices do so anyway.
466 */
467 if ((driver_byte(sreq->sr_result) & DRIVER_SENSE) &&
468 scsi_request_normalize_sense(sreq, &sshdr)) {
469 if ((sshdr.sense_key == UNIT_ATTENTION) &&
470 ((sshdr.asc == 0x28) ||
471 (sshdr.asc == 0x29)) &&
472 (sshdr.ascq == 0))
473 continue;
474 }
475 }
476 break;
477 }
478
479 if (sreq->sr_result == 0) {
480 response_len = (unsigned char) inq_result[4] + 5;
481 if (response_len > 255)
482 response_len = first_inquiry_len; /* sanity */
483
484 /*
485 * Get any flags for this device.
486 *
487 * XXX add a bflags to Scsi_Device, and replace the
488 * corresponding bit fields in Scsi_Device, so bflags
489 * need not be passed as an argument.
490 */
491 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
492 &inq_result[16]);
493
494 /* When the first pass succeeds we gain information about
495 * what larger transfer lengths might work. */
496 if (pass == 1) {
497 if (BLIST_INQUIRY_36 & *bflags)
498 next_inquiry_len = 36;
499 else if (BLIST_INQUIRY_58 & *bflags)
500 next_inquiry_len = 58;
501 else if (sdev->inquiry_len)
502 next_inquiry_len = sdev->inquiry_len;
503 else
504 next_inquiry_len = response_len;
505
506 /* If more data is available perform the second pass */
507 if (next_inquiry_len > try_inquiry_len) {
508 try_inquiry_len = next_inquiry_len;
509 pass = 2;
510 goto next_pass;
511 }
512 }
513
514 } else if (pass == 2) {
515 printk(KERN_INFO "scsi scan: %d byte inquiry failed. "
516 "Consider BLIST_INQUIRY_36 for this device\n",
517 try_inquiry_len);
518
519 /* If this pass failed, the third pass goes back and transfers
520 * the same amount as we successfully got in the first pass. */
521 try_inquiry_len = first_inquiry_len;
522 pass = 3;
523 goto next_pass;
524 }
525
526 /* If the last transfer attempt got an error, assume the
527 * peripheral doesn't exist or is dead. */
528 if (sreq->sr_result)
529 return;
530
531 /* Don't report any more data than the device says is valid */
532 sdev->inquiry_len = min(try_inquiry_len, response_len);
533
534 /*
535 * XXX Abort if the response length is less than 36? If less than
536 * 32, the lookup of the device flags (above) could be invalid,
537 * and it would be possible to take an incorrect action - we do
538 * not want to hang because of a short INQUIRY. On the flip side,
539 * if the device is spun down or becoming ready (and so it gives a
540 * short INQUIRY), an abort here prevents any further use of the
541 * device, including spin up.
542 *
543 * Related to the above issue:
544 *
545 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
546 * and if not ready, sent a START_STOP to start (maybe spin up) and
547 * then send the INQUIRY again, since the INQUIRY can change after
548 * a device is initialized.
549 *
550 * Ideally, start a device if explicitly asked to do so. This
551 * assumes that a device is spun up on power on, spun down on
552 * request, and then spun up on request.
553 */
554
555 /*
556 * The scanning code needs to know the scsi_level, even if no
557 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
558 * non-zero LUNs can be scanned.
559 */
560 sdev->scsi_level = inq_result[2] & 0x07;
561 if (sdev->scsi_level >= 2 ||
562 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
563 sdev->scsi_level++;
564
565 return;
566}
567
568/**
569 * scsi_add_lun - allocate and fully initialze a Scsi_Device
570 * @sdevscan: holds information to be stored in the new Scsi_Device
571 * @sdevnew: store the address of the newly allocated Scsi_Device
572 * @inq_result: holds the result of a previous INQUIRY to the LUN
573 * @bflags: black/white list flag
574 *
575 * Description:
576 * Allocate and initialize a Scsi_Device matching sdevscan. Optionally
577 * set fields based on values in *@bflags. If @sdevnew is not
578 * NULL, store the address of the new Scsi_Device in *@sdevnew (needed
579 * when scanning a particular LUN).
580 *
581 * Return:
582 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a Scsi_Device
583 * SCSI_SCAN_LUN_PRESENT: a new Scsi_Device was allocated and initialized
584 **/
585static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags)
586{
587 /*
588 * XXX do not save the inquiry, since it can change underneath us,
589 * save just vendor/model/rev.
590 *
591 * Rather than save it and have an ioctl that retrieves the saved
592 * value, have an ioctl that executes the same INQUIRY code used
593 * in scsi_probe_lun, let user level programs doing INQUIRY
594 * scanning run at their own risk, or supply a user level program
595 * that can correctly scan.
596 */
597 sdev->inquiry = kmalloc(sdev->inquiry_len, GFP_ATOMIC);
598 if (sdev->inquiry == NULL) {
599 return SCSI_SCAN_NO_RESPONSE;
600 }
601
602 memcpy(sdev->inquiry, inq_result, sdev->inquiry_len);
603 sdev->vendor = (char *) (sdev->inquiry + 8);
604 sdev->model = (char *) (sdev->inquiry + 16);
605 sdev->rev = (char *) (sdev->inquiry + 32);
606
607 if (*bflags & BLIST_ISROM) {
608 /*
609 * It would be better to modify sdev->type, and set
610 * sdev->removable, but then the print_inquiry() output
611 * would not show TYPE_ROM; if print_inquiry() is removed
612 * the issue goes away.
613 */
614 inq_result[0] = TYPE_ROM;
615 inq_result[1] |= 0x80; /* removable */
616 } else if (*bflags & BLIST_NO_ULD_ATTACH)
617 sdev->no_uld_attach = 1;
618
619 switch (sdev->type = (inq_result[0] & 0x1f)) {
620 case TYPE_TAPE:
621 case TYPE_DISK:
622 case TYPE_PRINTER:
623 case TYPE_MOD:
624 case TYPE_PROCESSOR:
625 case TYPE_SCANNER:
626 case TYPE_MEDIUM_CHANGER:
627 case TYPE_ENCLOSURE:
628 case TYPE_COMM:
629 sdev->writeable = 1;
630 break;
631 case TYPE_WORM:
632 case TYPE_ROM:
633 sdev->writeable = 0;
634 break;
635 default:
636 printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type);
637 }
638
639 print_inquiry(inq_result);
640
641 /*
642 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
643 * spec says: The device server is capable of supporting the
644 * specified peripheral device type on this logical unit. However,
645 * the physical device is not currently connected to this logical
646 * unit.
647 *
648 * The above is vague, as it implies that we could treat 001 and
649 * 011 the same. Stay compatible with previous code, and create a
650 * Scsi_Device for a PQ of 1
651 *
652 * Don't set the device offline here; rather let the upper
653 * level drivers eval the PQ to decide whether they should
654 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
655 */
656
657 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
658 sdev->removable = (0x80 & inq_result[1]) >> 7;
659 sdev->lockable = sdev->removable;
660 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
661
662 if (sdev->scsi_level >= SCSI_3 || (sdev->inquiry_len > 56 &&
663 inq_result[56] & 0x04))
664 sdev->ppr = 1;
665 if (inq_result[7] & 0x60)
666 sdev->wdtr = 1;
667 if (inq_result[7] & 0x10)
668 sdev->sdtr = 1;
669
670 sprintf(sdev->devfs_name, "scsi/host%d/bus%d/target%d/lun%d",
671 sdev->host->host_no, sdev->channel,
672 sdev->id, sdev->lun);
673
674 /*
675 * End driverfs/devfs code.
676 */
677
678 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
679 !(*bflags & BLIST_NOTQ))
680 sdev->tagged_supported = 1;
681 /*
682 * Some devices (Texel CD ROM drives) have handshaking problems
683 * when used with the Seagate controllers. borken is initialized
684 * to 1, and then set it to 0 here.
685 */
686 if ((*bflags & BLIST_BORKEN) == 0)
687 sdev->borken = 0;
688
689 /*
690 * Apparently some really broken devices (contrary to the SCSI
691 * standards) need to be selected without asserting ATN
692 */
693 if (*bflags & BLIST_SELECT_NO_ATN)
694 sdev->select_no_atn = 1;
695
696 /*
697 * Some devices may not want to have a start command automatically
698 * issued when a device is added.
699 */
700 if (*bflags & BLIST_NOSTARTONADD)
701 sdev->no_start_on_add = 1;
702
703 if (*bflags & BLIST_SINGLELUN)
704 sdev->single_lun = 1;
705
706
707 sdev->use_10_for_rw = 1;
708
709 if (*bflags & BLIST_MS_SKIP_PAGE_08)
710 sdev->skip_ms_page_8 = 1;
711
712 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
713 sdev->skip_ms_page_3f = 1;
714
715 if (*bflags & BLIST_USE_10_BYTE_MS)
716 sdev->use_10_for_ms = 1;
717
718 /* set the device running here so that slave configure
719 * may do I/O */
720 scsi_device_set_state(sdev, SDEV_RUNNING);
721
722 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
723 sdev->use_192_bytes_for_3f = 1;
724
725 if (*bflags & BLIST_NOT_LOCKABLE)
726 sdev->lockable = 0;
727
728 if (*bflags & BLIST_RETRY_HWERROR)
729 sdev->retry_hwerror = 1;
730
731 transport_configure_device(&sdev->sdev_gendev);
732
733 if (sdev->host->hostt->slave_configure)
734 sdev->host->hostt->slave_configure(sdev);
735
736 /*
737 * Ok, the device is now all set up, we can
738 * register it and tell the rest of the kernel
739 * about it.
740 */
741 scsi_sysfs_add_sdev(sdev);
742
743 return SCSI_SCAN_LUN_PRESENT;
744}
745
746/**
747 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
748 * @starget: pointer to target device structure
749 * @lun: LUN of target device
750 * @sdevscan: probe the LUN corresponding to this Scsi_Device
751 * @sdevnew: store the value of any new Scsi_Device allocated
752 * @bflagsp: store bflags here if not NULL
753 *
754 * Description:
755 * Call scsi_probe_lun, if a LUN with an attached device is found,
756 * allocate and set it up by calling scsi_add_lun.
757 *
758 * Return:
759 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a Scsi_Device
760 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
761 * attached at the LUN
762 * SCSI_SCAN_LUN_PRESENT: a new Scsi_Device was allocated and initialized
763 **/
764static int scsi_probe_and_add_lun(struct scsi_target *starget,
765 uint lun, int *bflagsp,
766 struct scsi_device **sdevp, int rescan,
767 void *hostdata)
768{
769 struct scsi_device *sdev;
770 struct scsi_request *sreq;
771 unsigned char *result;
772 int bflags, res = SCSI_SCAN_NO_RESPONSE;
773 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
774
775 /*
776 * The rescan flag is used as an optimization, the first scan of a
777 * host adapter calls into here with rescan == 0.
778 */
779 if (rescan) {
780 sdev = scsi_device_lookup_by_target(starget, lun);
781 if (sdev) {
782 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
783 "scsi scan: device exists on %s\n",
784 sdev->sdev_gendev.bus_id));
785 if (sdevp)
786 *sdevp = sdev;
787 else
788 scsi_device_put(sdev);
789
790 if (bflagsp)
791 *bflagsp = scsi_get_device_flags(sdev,
792 sdev->vendor,
793 sdev->model);
794 return SCSI_SCAN_LUN_PRESENT;
795 }
796 }
797
798 sdev = scsi_alloc_sdev(starget, lun, hostdata);
799 if (!sdev)
800 goto out;
801 sreq = scsi_allocate_request(sdev, GFP_ATOMIC);
802 if (!sreq)
803 goto out_free_sdev;
804 result = kmalloc(256, GFP_ATOMIC |
805 (shost->unchecked_isa_dma) ? __GFP_DMA : 0);
806 if (!result)
807 goto out_free_sreq;
808
809 scsi_probe_lun(sreq, result, &bflags);
810 if (sreq->sr_result)
811 goto out_free_result;
812
813 /*
814 * result contains valid SCSI INQUIRY data.
815 */
816 if ((result[0] >> 5) == 3) {
817 /*
818 * For a Peripheral qualifier 3 (011b), the SCSI
819 * spec says: The device server is not capable of
820 * supporting a physical device on this logical
821 * unit.
822 *
823 * For disks, this implies that there is no
824 * logical disk configured at sdev->lun, but there
825 * is a target id responding.
826 */
827 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
828 "scsi scan: peripheral qualifier of 3,"
829 " no device added\n"));
830 res = SCSI_SCAN_TARGET_PRESENT;
831 goto out_free_result;
832 }
833
834 res = scsi_add_lun(sdev, result, &bflags);
835 if (res == SCSI_SCAN_LUN_PRESENT) {
836 if (bflags & BLIST_KEY) {
837 sdev->lockable = 0;
838 scsi_unlock_floptical(sreq, result);
839 }
840 if (bflagsp)
841 *bflagsp = bflags;
842 }
843
844 out_free_result:
845 kfree(result);
846 out_free_sreq:
847 scsi_release_request(sreq);
848 out_free_sdev:
849 if (res == SCSI_SCAN_LUN_PRESENT) {
850 if (sdevp) {
851 scsi_device_get(sdev);
852 *sdevp = sdev;
853 }
854 } else {
855 if (sdev->host->hostt->slave_destroy)
856 sdev->host->hostt->slave_destroy(sdev);
857 transport_destroy_device(&sdev->sdev_gendev);
858 put_device(&sdev->sdev_gendev);
859 }
860 out:
861 return res;
862}
863
864/**
865 * scsi_sequential_lun_scan - sequentially scan a SCSI target
866 * @starget: pointer to target structure to scan
867 * @bflags: black/white list flag for LUN 0
868 * @lun0_res: result of scanning LUN 0
869 *
870 * Description:
871 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
872 * scanned) to some maximum lun until a LUN is found with no device
873 * attached. Use the bflags to figure out any oddities.
874 *
875 * Modifies sdevscan->lun.
876 **/
877static void scsi_sequential_lun_scan(struct scsi_target *starget,
878 int bflags, int lun0_res, int scsi_level,
879 int rescan)
880{
881 unsigned int sparse_lun, lun, max_dev_lun;
882 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
883
884 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of"
885 "%s\n", starget->dev.bus_id));
886
887 max_dev_lun = min(max_scsi_luns, shost->max_lun);
888 /*
889 * If this device is known to support sparse multiple units,
890 * override the other settings, and scan all of them. Normally,
891 * SCSI-3 devices should be scanned via the REPORT LUNS.
892 */
893 if (bflags & BLIST_SPARSELUN) {
894 max_dev_lun = shost->max_lun;
895 sparse_lun = 1;
896 } else
897 sparse_lun = 0;
898
899 /*
900 * If not sparse lun and no device attached at LUN 0 do not scan
901 * any further.
902 */
903 if (!sparse_lun && (lun0_res != SCSI_SCAN_LUN_PRESENT))
904 return;
905
906 /*
907 * If less than SCSI_1_CSS, and no special lun scaning, stop
908 * scanning; this matches 2.4 behaviour, but could just be a bug
909 * (to continue scanning a SCSI_1_CSS device).
910 *
911 * This test is broken. We might not have any device on lun0 for
912 * a sparselun device, and if that's the case then how would we
913 * know the real scsi_level, eh? It might make sense to just not
914 * scan any SCSI_1 device for non-0 luns, but that check would best
915 * go into scsi_alloc_sdev() and just have it return null when asked
916 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
917 *
918 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
919 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
920 == 0))
921 return;
922 */
923 /*
924 * If this device is known to support multiple units, override
925 * the other settings, and scan all of them.
926 */
927 if (bflags & BLIST_FORCELUN)
928 max_dev_lun = shost->max_lun;
929 /*
930 * REGAL CDC-4X: avoid hang after LUN 4
931 */
932 if (bflags & BLIST_MAX5LUN)
933 max_dev_lun = min(5U, max_dev_lun);
934 /*
935 * Do not scan SCSI-2 or lower device past LUN 7, unless
936 * BLIST_LARGELUN.
937 */
938 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
939 max_dev_lun = min(8U, max_dev_lun);
940
941 /*
942 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
943 * until we reach the max, or no LUN is found and we are not
944 * sparse_lun.
945 */
946 for (lun = 1; lun < max_dev_lun; ++lun)
947 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
948 NULL) != SCSI_SCAN_LUN_PRESENT) &&
949 !sparse_lun)
950 return;
951}
952
953/**
954 * scsilun_to_int: convert a scsi_lun to an int
955 * @scsilun: struct scsi_lun to be converted.
956 *
957 * Description:
958 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
959 * integer, and return the result. The caller must check for
960 * truncation before using this function.
961 *
962 * Notes:
963 * The struct scsi_lun is assumed to be four levels, with each level
964 * effectively containing a SCSI byte-ordered (big endian) short; the
965 * addressing bits of each level are ignored (the highest two bits).
966 * For a description of the LUN format, post SCSI-3 see the SCSI
967 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
968 *
969 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
970 * the integer: 0x0b030a04
971 **/
972static int scsilun_to_int(struct scsi_lun *scsilun)
973{
974 int i;
975 unsigned int lun;
976
977 lun = 0;
978 for (i = 0; i < sizeof(lun); i += 2)
979 lun = lun | (((scsilun->scsi_lun[i] << 8) |
980 scsilun->scsi_lun[i + 1]) << (i * 8));
981 return lun;
982}
983
984/**
985 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
986 * @sdevscan: scan the host, channel, and id of this Scsi_Device
987 *
988 * Description:
989 * If @sdevscan is for a SCSI-3 or up device, send a REPORT LUN
990 * command, and scan the resulting list of LUNs by calling
991 * scsi_probe_and_add_lun.
992 *
993 * Modifies sdevscan->lun.
994 *
995 * Return:
996 * 0: scan completed (or no memory, so further scanning is futile)
997 * 1: no report lun scan, or not configured
998 **/
999static int scsi_report_lun_scan(struct scsi_device *sdev, int bflags,
1000 int rescan)
1001{
1002 char devname[64];
1003 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1004 unsigned int length;
1005 unsigned int lun;
1006 unsigned int num_luns;
1007 unsigned int retries;
1008 struct scsi_lun *lunp, *lun_data;
1009 struct scsi_request *sreq;
1010 u8 *data;
1011 struct scsi_sense_hdr sshdr;
1012 struct scsi_target *starget = scsi_target(sdev);
1013
1014 /*
1015 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1016 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1017 * support more than 8 LUNs.
1018 */
1019 if ((bflags & BLIST_NOREPORTLUN) ||
1020 sdev->scsi_level < SCSI_2 ||
1021 (sdev->scsi_level < SCSI_3 &&
1022 (!(bflags & BLIST_REPORTLUN2) || sdev->host->max_lun <= 8)) )
1023 return 1;
1024 if (bflags & BLIST_NOLUN)
1025 return 0;
1026
1027 sreq = scsi_allocate_request(sdev, GFP_ATOMIC);
1028 if (!sreq)
1029 goto out;
1030
1031 sprintf(devname, "host %d channel %d id %d",
1032 sdev->host->host_no, sdev->channel, sdev->id);
1033
1034 /*
1035 * Allocate enough to hold the header (the same size as one scsi_lun)
1036 * plus the max number of luns we are requesting.
1037 *
1038 * Reallocating and trying again (with the exact amount we need)
1039 * would be nice, but then we need to somehow limit the size
1040 * allocated based on the available memory and the limits of
1041 * kmalloc - we don't want a kmalloc() failure of a huge value to
1042 * prevent us from finding any LUNs on this target.
1043 */
1044 length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun);
1045 lun_data = kmalloc(length, GFP_ATOMIC |
1046 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
1047 if (!lun_data)
1048 goto out_release_request;
1049
1050 scsi_cmd[0] = REPORT_LUNS;
1051
1052 /*
1053 * bytes 1 - 5: reserved, set to zero.
1054 */
1055 memset(&scsi_cmd[1], 0, 5);
1056
1057 /*
1058 * bytes 6 - 9: length of the command.
1059 */
1060 scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff;
1061 scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff;
1062 scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff;
1063 scsi_cmd[9] = (unsigned char) length & 0xff;
1064
1065 scsi_cmd[10] = 0; /* reserved */
1066 scsi_cmd[11] = 0; /* control */
1067 sreq->sr_cmd_len = 0;
1068 sreq->sr_data_direction = DMA_FROM_DEVICE;
1069
1070 /*
1071 * We can get a UNIT ATTENTION, for example a power on/reset, so
1072 * retry a few times (like sd.c does for TEST UNIT READY).
1073 * Experience shows some combinations of adapter/devices get at
1074 * least two power on/resets.
1075 *
1076 * Illegal requests (for devices that do not support REPORT LUNS)
1077 * should come through as a check condition, and will not generate
1078 * a retry.
1079 */
1080 for (retries = 0; retries < 3; retries++) {
1081 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending"
1082 " REPORT LUNS to %s (try %d)\n", devname,
1083 retries));
1084 scsi_wait_req(sreq, scsi_cmd, lun_data, length,
1085 SCSI_TIMEOUT + 4*HZ, 3);
1086 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS"
1087 " %s (try %d) result 0x%x\n", sreq->sr_result
1088 ? "failed" : "successful", retries,
1089 sreq->sr_result));
1090 if (sreq->sr_result == 0)
1091 break;
1092 else if (scsi_request_normalize_sense(sreq, &sshdr)) {
1093 if (sshdr.sense_key != UNIT_ATTENTION)
1094 break;
1095 }
1096 }
1097
1098 if (sreq->sr_result) {
1099 /*
1100 * The device probably does not support a REPORT LUN command
1101 */
1102 kfree(lun_data);
1103 scsi_release_request(sreq);
1104 return 1;
1105 }
1106 scsi_release_request(sreq);
1107
1108 /*
1109 * Get the length from the first four bytes of lun_data.
1110 */
1111 data = (u8 *) lun_data->scsi_lun;
1112 length = ((data[0] << 24) | (data[1] << 16) |
1113 (data[2] << 8) | (data[3] << 0));
1114
1115 num_luns = (length / sizeof(struct scsi_lun));
1116 if (num_luns > max_scsi_report_luns) {
1117 printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)"
1118 " of %d luns reported, try increasing"
1119 " max_scsi_report_luns.\n", devname,
1120 max_scsi_report_luns, num_luns);
1121 num_luns = max_scsi_report_luns;
1122 }
1123
1124 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUN scan of"
1125 " host %d channel %d id %d\n", sdev->host->host_no,
1126 sdev->channel, sdev->id));
1127
1128 /*
1129 * Scan the luns in lun_data. The entry at offset 0 is really
1130 * the header, so start at 1 and go up to and including num_luns.
1131 */
1132 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1133 lun = scsilun_to_int(lunp);
1134
1135 /*
1136 * Check if the unused part of lunp is non-zero, and so
1137 * does not fit in lun.
1138 */
1139 if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) {
1140 int i;
1141
1142 /*
1143 * Output an error displaying the LUN in byte order,
1144 * this differs from what linux would print for the
1145 * integer LUN value.
1146 */
1147 printk(KERN_WARNING "scsi: %s lun 0x", devname);
1148 data = (char *)lunp->scsi_lun;
1149 for (i = 0; i < sizeof(struct scsi_lun); i++)
1150 printk("%02x", data[i]);
1151 printk(" has a LUN larger than currently supported.\n");
1152 } else if (lun == 0) {
1153 /*
1154 * LUN 0 has already been scanned.
1155 */
1156 } else if (lun > sdev->host->max_lun) {
1157 printk(KERN_WARNING "scsi: %s lun%d has a LUN larger"
1158 " than allowed by the host adapter\n",
1159 devname, lun);
1160 } else {
1161 int res;
1162
1163 res = scsi_probe_and_add_lun(starget,
1164 lun, NULL, NULL, rescan, NULL);
1165 if (res == SCSI_SCAN_NO_RESPONSE) {
1166 /*
1167 * Got some results, but now none, abort.
1168 */
1169 printk(KERN_ERR "scsi: Unexpected response"
1170 " from %s lun %d while scanning, scan"
1171 " aborted\n", devname, lun);
1172 break;
1173 }
1174 }
1175 }
1176
1177 kfree(lun_data);
1178 return 0;
1179
1180 out_release_request:
1181 scsi_release_request(sreq);
1182 out:
1183 /*
1184 * We are out of memory, don't try scanning any further.
1185 */
1186 printk(ALLOC_FAILURE_MSG, __FUNCTION__);
1187 return 0;
1188}
1189
1190struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
1191 uint id, uint lun, void *hostdata)
1192{
1193 struct scsi_device *sdev;
1194 struct device *parent = &shost->shost_gendev;
1195 int res;
1196 struct scsi_target *starget = scsi_alloc_target(parent, channel, id);
1197
1198 if (!starget)
1199 return ERR_PTR(-ENOMEM);
1200
1201 down(&shost->scan_mutex);
1202 res = scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
1203 if (res != SCSI_SCAN_LUN_PRESENT)
1204 sdev = ERR_PTR(-ENODEV);
1205 up(&shost->scan_mutex);
1206 scsi_target_reap(starget);
1207 put_device(&starget->dev);
1208
1209 return sdev;
1210}
1211EXPORT_SYMBOL(__scsi_add_device);
1212
1213void scsi_rescan_device(struct device *dev)
1214{
1215 struct scsi_driver *drv;
1216
1217 if (!dev->driver)
1218 return;
1219
1220 drv = to_scsi_driver(dev->driver);
1221 if (try_module_get(drv->owner)) {
1222 if (drv->rescan)
1223 drv->rescan(dev);
1224 module_put(drv->owner);
1225 }
1226}
1227EXPORT_SYMBOL(scsi_rescan_device);
1228
1229/**
1230 * scsi_scan_target - scan a target id, possibly including all LUNs on the
1231 * target.
1232 * @sdevsca: Scsi_Device handle for scanning
1233 * @shost: host to scan
1234 * @channel: channel to scan
1235 * @id: target id to scan
1236 *
1237 * Description:
1238 * Scan the target id on @shost, @channel, and @id. Scan at least LUN
1239 * 0, and possibly all LUNs on the target id.
1240 *
1241 * Use the pre-allocated @sdevscan as a handle for the scanning. This
1242 * function sets sdevscan->host, sdevscan->id and sdevscan->lun; the
1243 * scanning functions modify sdevscan->lun.
1244 *
1245 * First try a REPORT LUN scan, if that does not scan the target, do a
1246 * sequential scan of LUNs on the target id.
1247 **/
1248void scsi_scan_target(struct device *parent, unsigned int channel,
1249 unsigned int id, unsigned int lun, int rescan)
1250{
1251 struct Scsi_Host *shost = dev_to_shost(parent);
1252 int bflags = 0;
1253 int res;
1254 struct scsi_device *sdev = NULL;
1255 struct scsi_target *starget;
1256
1257 if (shost->this_id == id)
1258 /*
1259 * Don't scan the host adapter
1260 */
1261 return;
1262
1263
1264 starget = scsi_alloc_target(parent, channel, id);
1265
1266 if (!starget)
1267 return;
1268
1269 get_device(&starget->dev);
1270 if (lun != SCAN_WILD_CARD) {
1271 /*
1272 * Scan for a specific host/chan/id/lun.
1273 */
1274 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1275 goto out_reap;
1276 }
1277
1278 /*
1279 * Scan LUN 0, if there is some response, scan further. Ideally, we
1280 * would not configure LUN 0 until all LUNs are scanned.
1281 */
1282 res = scsi_probe_and_add_lun(starget, 0, &bflags, &sdev, rescan, NULL);
1283 if (res == SCSI_SCAN_LUN_PRESENT) {
1284 if (scsi_report_lun_scan(sdev, bflags, rescan) != 0)
1285 /*
1286 * The REPORT LUN did not scan the target,
1287 * do a sequential scan.
1288 */
1289 scsi_sequential_lun_scan(starget, bflags,
1290 res, sdev->scsi_level, rescan);
1291 } else if (res == SCSI_SCAN_TARGET_PRESENT) {
1292 /*
1293 * There's a target here, but lun 0 is offline so we
1294 * can't use the report_lun scan. Fall back to a
1295 * sequential lun scan with a bflags of SPARSELUN and
1296 * a default scsi level of SCSI_2
1297 */
1298 scsi_sequential_lun_scan(starget, BLIST_SPARSELUN,
1299 SCSI_SCAN_TARGET_PRESENT, SCSI_2, rescan);
1300 }
1301 if (sdev)
1302 scsi_device_put(sdev);
1303
1304 out_reap:
1305 /* now determine if the target has any children at all
1306 * and if not, nuke it */
1307 scsi_target_reap(starget);
1308
1309 put_device(&starget->dev);
1310}
1311EXPORT_SYMBOL(scsi_scan_target);
1312
1313static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1314 unsigned int id, unsigned int lun, int rescan)
1315{
1316 uint order_id;
1317
1318 if (id == SCAN_WILD_CARD)
1319 for (id = 0; id < shost->max_id; ++id) {
1320 /*
1321 * XXX adapter drivers when possible (FCP, iSCSI)
1322 * could modify max_id to match the current max,
1323 * not the absolute max.
1324 *
1325 * XXX add a shost id iterator, so for example,
1326 * the FC ID can be the same as a target id
1327 * without a huge overhead of sparse id's.
1328 */
1329 if (shost->reverse_ordering)
1330 /*
1331 * Scan from high to low id.
1332 */
1333 order_id = shost->max_id - id - 1;
1334 else
1335 order_id = id;
1336 scsi_scan_target(&shost->shost_gendev, channel, order_id, lun, rescan);
1337 }
1338 else
1339 scsi_scan_target(&shost->shost_gendev, channel, id, lun, rescan);
1340}
1341
1342int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1343 unsigned int id, unsigned int lun, int rescan)
1344{
1345 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "%s: <%u:%u:%u:%u>\n",
1346 __FUNCTION__, shost->host_no, channel, id, lun));
1347
1348 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
1349 ((id != SCAN_WILD_CARD) && (id > shost->max_id)) ||
1350 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1351 return -EINVAL;
1352
1353 down(&shost->scan_mutex);
1354 if (channel == SCAN_WILD_CARD)
1355 for (channel = 0; channel <= shost->max_channel; channel++)
1356 scsi_scan_channel(shost, channel, id, lun, rescan);
1357 else
1358 scsi_scan_channel(shost, channel, id, lun, rescan);
1359 up(&shost->scan_mutex);
1360
1361 return 0;
1362}
1363
1364/**
1365 * scsi_scan_host - scan the given adapter
1366 * @shost: adapter to scan
1367 **/
1368void scsi_scan_host(struct Scsi_Host *shost)
1369{
1370 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1371 SCAN_WILD_CARD, 0);
1372}
1373EXPORT_SYMBOL(scsi_scan_host);
1374
1375/**
1376 * scsi_scan_single_target - scan the given SCSI target
1377 * @shost: adapter to scan
1378 * @chan: channel to scan
1379 * @id: target id to scan
1380 **/
1381void scsi_scan_single_target(struct Scsi_Host *shost,
1382 unsigned int chan, unsigned int id)
1383{
1384 scsi_scan_host_selected(shost, chan, id, SCAN_WILD_CARD, 1);
1385}
1386EXPORT_SYMBOL(scsi_scan_single_target);
1387
1388void scsi_forget_host(struct Scsi_Host *shost)
1389{
1390 struct scsi_target *starget, *tmp;
1391 unsigned long flags;
1392
1393 /*
1394 * Ok, this look a bit strange. We always look for the first device
1395 * on the list as scsi_remove_device removes them from it - thus we
1396 * also have to release the lock.
1397 * We don't need to get another reference to the device before
1398 * releasing the lock as we already own the reference from
1399 * scsi_register_device that's release in scsi_remove_device. And
1400 * after that we don't look at sdev anymore.
1401 */
1402 spin_lock_irqsave(shost->host_lock, flags);
1403 list_for_each_entry_safe(starget, tmp, &shost->__targets, siblings) {
1404 spin_unlock_irqrestore(shost->host_lock, flags);
1405 scsi_remove_target(&starget->dev);
1406 spin_lock_irqsave(shost->host_lock, flags);
1407 }
1408 spin_unlock_irqrestore(shost->host_lock, flags);
1409}
1410
1411/*
1412 * Function: scsi_get_host_dev()
1413 *
1414 * Purpose: Create a Scsi_Device that points to the host adapter itself.
1415 *
1416 * Arguments: SHpnt - Host that needs a Scsi_Device
1417 *
1418 * Lock status: None assumed.
1419 *
1420 * Returns: The Scsi_Device or NULL
1421 *
1422 * Notes:
1423 * Attach a single Scsi_Device to the Scsi_Host - this should
1424 * be made to look like a "pseudo-device" that points to the
1425 * HA itself.
1426 *
1427 * Note - this device is not accessible from any high-level
1428 * drivers (including generics), which is probably not
1429 * optimal. We can add hooks later to attach
1430 */
1431struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1432{
1433 struct scsi_device *sdev;
1434 struct scsi_target *starget;
1435
1436 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1437 if (!starget)
1438 return NULL;
1439
1440 sdev = scsi_alloc_sdev(starget, 0, NULL);
1441 if (sdev) {
1442 sdev->sdev_gendev.parent = get_device(&starget->dev);
1443 sdev->borken = 0;
1444 }
1445 put_device(&starget->dev);
1446 return sdev;
1447}
1448EXPORT_SYMBOL(scsi_get_host_dev);
1449
1450/*
1451 * Function: scsi_free_host_dev()
1452 *
1453 * Purpose: Free a scsi_device that points to the host adapter itself.
1454 *
1455 * Arguments: SHpnt - Host that needs a Scsi_Device
1456 *
1457 * Lock status: None assumed.
1458 *
1459 * Returns: Nothing
1460 *
1461 * Notes:
1462 */
1463void scsi_free_host_dev(struct scsi_device *sdev)
1464{
1465 BUG_ON(sdev->id != sdev->host->this_id);
1466
1467 if (sdev->host->hostt->slave_destroy)
1468 sdev->host->hostt->slave_destroy(sdev);
1469 transport_destroy_device(&sdev->sdev_gendev);
1470 put_device(&sdev->sdev_gendev);
1471}
1472EXPORT_SYMBOL(scsi_free_host_dev);
1473
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-11 04:51:10 -0500