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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Christoph Hellwigf64a1812005-10-31 18:32:08 +010012 * device attached, a scsi_device is allocated and setup for it.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
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
Christoph Hellwigf64a1812005-10-31 18:32:08 +010020 * scsi_device for it.
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 *
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
James Bottomley39216032005-06-15 18:48:29 -0500114 * @sdev: scsi device to send command to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 * @result: area to store the result of the MODE SENSE
116 *
117 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500118 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 * Called for BLIST_KEY devices.
120 **/
James Bottomley39216032005-06-15 18:48:29 -0500121static void scsi_unlock_floptical(struct scsi_device *sdev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 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;
James Bottomley39216032005-06-15 18:48:29 -0500131 scsi_cmd[4] = 0x2a; /* size */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 scsi_cmd[5] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500133 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
134 SCSI_TIMEOUT, 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135}
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 **/
149static 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 **/
201static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 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
269
270
271 */
272 if (ret == -ENXIO)
273 display_failure_msg = 0;
274 goto out_device_destroy;
275 }
276 }
277
278 return sdev;
279
280out_device_destroy:
281 transport_destroy_device(&sdev->sdev_gendev);
282 scsi_free_queue(sdev->request_queue);
283 put_device(&sdev->sdev_gendev);
284out:
285 if (display_failure_msg)
286 printk(ALLOC_FAILURE_MSG, __FUNCTION__);
287 return NULL;
288}
289
290static void scsi_target_dev_release(struct device *dev)
291{
292 struct device *parent = dev->parent;
293 struct scsi_target *starget = to_scsi_target(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500294 struct Scsi_Host *shost = dev_to_shost(parent);
295
296 if (shost->hostt->target_destroy)
297 shost->hostt->target_destroy(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 kfree(starget);
299 put_device(parent);
300}
301
302int scsi_is_target_device(const struct device *dev)
303{
304 return dev->release == scsi_target_dev_release;
305}
306EXPORT_SYMBOL(scsi_is_target_device);
307
308static struct scsi_target *__scsi_find_target(struct device *parent,
309 int channel, uint id)
310{
311 struct scsi_target *starget, *found_starget = NULL;
312 struct Scsi_Host *shost = dev_to_shost(parent);
313 /*
314 * Search for an existing target for this sdev.
315 */
316 list_for_each_entry(starget, &shost->__targets, siblings) {
317 if (starget->id == id &&
318 starget->channel == channel) {
319 found_starget = starget;
320 break;
321 }
322 }
323 if (found_starget)
324 get_device(&found_starget->dev);
325
326 return found_starget;
327}
328
329static struct scsi_target *scsi_alloc_target(struct device *parent,
330 int channel, uint id)
331{
332 struct Scsi_Host *shost = dev_to_shost(parent);
333 struct device *dev = NULL;
334 unsigned long flags;
335 const int size = sizeof(struct scsi_target)
336 + shost->transportt->target_size;
James.Smart@Emulex.Com5c44cd22005-06-10 22:24:30 -0400337 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 struct scsi_target *found_target;
339
James.Smart@Emulex.Com5c44cd22005-06-10 22:24:30 -0400340 /*
341 * Obtain the real parent from the transport. The transport
342 * is allowed to fail (no error) if there is nothing at that
343 * target id.
344 */
345 if (shost->transportt->target_parent) {
346 spin_lock_irqsave(shost->host_lock, flags);
347 parent = shost->transportt->target_parent(shost, channel, id);
348 spin_unlock_irqrestore(shost->host_lock, flags);
349 if (!parent)
350 return NULL;
351 }
352
353 starget = kmalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 if (!starget) {
355 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
356 return NULL;
357 }
358 memset(starget, 0, size);
359 dev = &starget->dev;
360 device_initialize(dev);
361 starget->reap_ref = 1;
362 dev->parent = get_device(parent);
363 dev->release = scsi_target_dev_release;
364 sprintf(dev->bus_id, "target%d:%d:%d",
365 shost->host_no, channel, id);
366 starget->id = id;
367 starget->channel = channel;
368 INIT_LIST_HEAD(&starget->siblings);
369 INIT_LIST_HEAD(&starget->devices);
370 spin_lock_irqsave(shost->host_lock, flags);
371
372 found_target = __scsi_find_target(parent, channel, id);
373 if (found_target)
374 goto found;
375
376 list_add_tail(&starget->siblings, &shost->__targets);
377 spin_unlock_irqrestore(shost->host_lock, flags);
378 /* allocate and add */
James Bottomleya283bd32005-05-24 12:06:38 -0500379 transport_setup_device(dev);
380 device_add(dev);
381 transport_add_device(dev);
382 if (shost->hostt->target_alloc) {
383 int error = shost->hostt->target_alloc(starget);
384
385 if(error) {
386 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
387 /* don't want scsi_target_reap to do the final
388 * put because it will be under the host lock */
389 get_device(dev);
390 scsi_target_reap(starget);
391 put_device(dev);
392 return NULL;
393 }
394 }
395
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 return starget;
397
398 found:
399 found_target->reap_ref++;
400 spin_unlock_irqrestore(shost->host_lock, flags);
401 put_device(parent);
402 kfree(starget);
403 return found_target;
404}
405
406/**
407 * scsi_target_reap - check to see if target is in use and destroy if not
408 *
409 * @starget: target to be checked
410 *
411 * This is used after removing a LUN or doing a last put of the target
412 * it checks atomically that nothing is using the target and removes
413 * it if so.
414 */
415void scsi_target_reap(struct scsi_target *starget)
416{
417 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
418 unsigned long flags;
419 spin_lock_irqsave(shost->host_lock, flags);
420
421 if (--starget->reap_ref == 0 && list_empty(&starget->devices)) {
422 list_del_init(&starget->siblings);
423 spin_unlock_irqrestore(shost->host_lock, flags);
424 device_del(&starget->dev);
425 transport_unregister_device(&starget->dev);
426 put_device(&starget->dev);
427 return;
428 }
429 spin_unlock_irqrestore(shost->host_lock, flags);
430}
431
432/**
433 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
James Bottomley39216032005-06-15 18:48:29 -0500434 * @sdev: scsi_device to probe
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 * @inq_result: area to store the INQUIRY result
James Bottomley39216032005-06-15 18:48:29 -0500436 * @result_len: len of inq_result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 * @bflags: store any bflags found here
438 *
439 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500440 * Probe the lun associated with @req using a standard SCSI INQUIRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 *
James Bottomley39216032005-06-15 18:48:29 -0500442 * If the INQUIRY is successful, zero is returned and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100444 * are copied to the scsi_device any flags value is stored in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 **/
James Bottomley39216032005-06-15 18:48:29 -0500446static int scsi_probe_lun(struct scsi_device *sdev, char *inq_result,
447 int result_len, int *bflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
450 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
451 int response_len = 0;
James Bottomley39216032005-06-15 18:48:29 -0500452 int pass, count, result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 struct scsi_sense_hdr sshdr;
454
455 *bflags = 0;
456
457 /* Perform up to 3 passes. The first pass uses a conservative
458 * transfer length of 36 unless sdev->inquiry_len specifies a
459 * different value. */
460 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
461 try_inquiry_len = first_inquiry_len;
462 pass = 1;
463
464 next_pass:
James Bottomley9ccfc752005-10-02 11:45:08 -0500465 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
466 "scsi scan: INQUIRY pass %d length %d\n",
467 pass, try_inquiry_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
469 /* Each pass gets up to three chances to ignore Unit Attention */
470 for (count = 0; count < 3; ++count) {
471 memset(scsi_cmd, 0, 6);
472 scsi_cmd[0] = INQUIRY;
473 scsi_cmd[4] = (unsigned char) try_inquiry_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
475 memset(inq_result, 0, try_inquiry_len);
James Bottomley39216032005-06-15 18:48:29 -0500476
477 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -0500478 inq_result, try_inquiry_len, &sshdr,
James Bottomley39216032005-06-15 18:48:29 -0500479 HZ / 2 + HZ * scsi_inq_timeout, 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
481 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
482 "with code 0x%x\n",
James Bottomley39216032005-06-15 18:48:29 -0500483 result ? "failed" : "successful", result));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
James Bottomley39216032005-06-15 18:48:29 -0500485 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 /*
487 * not-ready to ready transition [asc/ascq=0x28/0x0]
488 * or power-on, reset [asc/ascq=0x29/0x0], continue.
489 * INQUIRY should not yield UNIT_ATTENTION
490 * but many buggy devices do so anyway.
491 */
James Bottomley39216032005-06-15 18:48:29 -0500492 if ((driver_byte(result) & DRIVER_SENSE) &&
James Bottomleyea73a9f2005-08-28 11:33:52 -0500493 scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 if ((sshdr.sense_key == UNIT_ATTENTION) &&
495 ((sshdr.asc == 0x28) ||
496 (sshdr.asc == 0x29)) &&
497 (sshdr.ascq == 0))
498 continue;
499 }
500 }
501 break;
502 }
503
James Bottomley39216032005-06-15 18:48:29 -0500504 if (result == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 response_len = (unsigned char) inq_result[4] + 5;
506 if (response_len > 255)
507 response_len = first_inquiry_len; /* sanity */
508
509 /*
510 * Get any flags for this device.
511 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100512 * XXX add a bflags to scsi_device, and replace the
513 * corresponding bit fields in scsi_device, so bflags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 * need not be passed as an argument.
515 */
516 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
517 &inq_result[16]);
518
519 /* When the first pass succeeds we gain information about
520 * what larger transfer lengths might work. */
521 if (pass == 1) {
522 if (BLIST_INQUIRY_36 & *bflags)
523 next_inquiry_len = 36;
524 else if (BLIST_INQUIRY_58 & *bflags)
525 next_inquiry_len = 58;
526 else if (sdev->inquiry_len)
527 next_inquiry_len = sdev->inquiry_len;
528 else
529 next_inquiry_len = response_len;
530
531 /* If more data is available perform the second pass */
532 if (next_inquiry_len > try_inquiry_len) {
533 try_inquiry_len = next_inquiry_len;
534 pass = 2;
535 goto next_pass;
536 }
537 }
538
539 } else if (pass == 2) {
540 printk(KERN_INFO "scsi scan: %d byte inquiry failed. "
541 "Consider BLIST_INQUIRY_36 for this device\n",
542 try_inquiry_len);
543
544 /* If this pass failed, the third pass goes back and transfers
545 * the same amount as we successfully got in the first pass. */
546 try_inquiry_len = first_inquiry_len;
547 pass = 3;
548 goto next_pass;
549 }
550
551 /* If the last transfer attempt got an error, assume the
552 * peripheral doesn't exist or is dead. */
James Bottomley39216032005-06-15 18:48:29 -0500553 if (result)
554 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
556 /* Don't report any more data than the device says is valid */
557 sdev->inquiry_len = min(try_inquiry_len, response_len);
558
559 /*
560 * XXX Abort if the response length is less than 36? If less than
561 * 32, the lookup of the device flags (above) could be invalid,
562 * and it would be possible to take an incorrect action - we do
563 * not want to hang because of a short INQUIRY. On the flip side,
564 * if the device is spun down or becoming ready (and so it gives a
565 * short INQUIRY), an abort here prevents any further use of the
566 * device, including spin up.
567 *
568 * Related to the above issue:
569 *
570 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
571 * and if not ready, sent a START_STOP to start (maybe spin up) and
572 * then send the INQUIRY again, since the INQUIRY can change after
573 * a device is initialized.
574 *
575 * Ideally, start a device if explicitly asked to do so. This
576 * assumes that a device is spun up on power on, spun down on
577 * request, and then spun up on request.
578 */
579
580 /*
581 * The scanning code needs to know the scsi_level, even if no
582 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
583 * non-zero LUNs can be scanned.
584 */
585 sdev->scsi_level = inq_result[2] & 0x07;
586 if (sdev->scsi_level >= 2 ||
587 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
588 sdev->scsi_level++;
James Bottomley6f3a2022005-09-22 20:33:28 -0500589 sdev->sdev_target->scsi_level = sdev->scsi_level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590
James Bottomley39216032005-06-15 18:48:29 -0500591 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592}
593
594/**
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100595 * scsi_add_lun - allocate and fully initialze a scsi_device
596 * @sdevscan: holds information to be stored in the new scsi_device
597 * @sdevnew: store the address of the newly allocated scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 * @inq_result: holds the result of a previous INQUIRY to the LUN
599 * @bflags: black/white list flag
600 *
601 * Description:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100602 * Allocate and initialize a scsi_device matching sdevscan. Optionally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 * set fields based on values in *@bflags. If @sdevnew is not
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100604 * NULL, store the address of the new scsi_device in *@sdevnew (needed
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 * when scanning a particular LUN).
606 *
607 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100608 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
609 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 **/
611static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags)
612{
613 /*
614 * XXX do not save the inquiry, since it can change underneath us,
615 * save just vendor/model/rev.
616 *
617 * Rather than save it and have an ioctl that retrieves the saved
618 * value, have an ioctl that executes the same INQUIRY code used
619 * in scsi_probe_lun, let user level programs doing INQUIRY
620 * scanning run at their own risk, or supply a user level program
621 * that can correctly scan.
622 */
623 sdev->inquiry = kmalloc(sdev->inquiry_len, GFP_ATOMIC);
624 if (sdev->inquiry == NULL) {
625 return SCSI_SCAN_NO_RESPONSE;
626 }
627
628 memcpy(sdev->inquiry, inq_result, sdev->inquiry_len);
629 sdev->vendor = (char *) (sdev->inquiry + 8);
630 sdev->model = (char *) (sdev->inquiry + 16);
631 sdev->rev = (char *) (sdev->inquiry + 32);
632
633 if (*bflags & BLIST_ISROM) {
634 /*
635 * It would be better to modify sdev->type, and set
636 * sdev->removable, but then the print_inquiry() output
637 * would not show TYPE_ROM; if print_inquiry() is removed
638 * the issue goes away.
639 */
640 inq_result[0] = TYPE_ROM;
641 inq_result[1] |= 0x80; /* removable */
642 } else if (*bflags & BLIST_NO_ULD_ATTACH)
643 sdev->no_uld_attach = 1;
644
645 switch (sdev->type = (inq_result[0] & 0x1f)) {
646 case TYPE_TAPE:
647 case TYPE_DISK:
648 case TYPE_PRINTER:
649 case TYPE_MOD:
650 case TYPE_PROCESSOR:
651 case TYPE_SCANNER:
652 case TYPE_MEDIUM_CHANGER:
653 case TYPE_ENCLOSURE:
654 case TYPE_COMM:
Al Viro 631e8a12005-05-16 01:59:55 +0100655 case TYPE_RBC:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 sdev->writeable = 1;
657 break;
658 case TYPE_WORM:
659 case TYPE_ROM:
660 sdev->writeable = 0;
661 break;
662 default:
663 printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type);
664 }
665
666 print_inquiry(inq_result);
667
668 /*
669 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
670 * spec says: The device server is capable of supporting the
671 * specified peripheral device type on this logical unit. However,
672 * the physical device is not currently connected to this logical
673 * unit.
674 *
675 * The above is vague, as it implies that we could treat 001 and
676 * 011 the same. Stay compatible with previous code, and create a
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100677 * scsi_device for a PQ of 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 *
679 * Don't set the device offline here; rather let the upper
680 * level drivers eval the PQ to decide whether they should
681 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
682 */
683
684 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
685 sdev->removable = (0x80 & inq_result[1]) >> 7;
686 sdev->lockable = sdev->removable;
687 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
688
689 if (sdev->scsi_level >= SCSI_3 || (sdev->inquiry_len > 56 &&
690 inq_result[56] & 0x04))
691 sdev->ppr = 1;
692 if (inq_result[7] & 0x60)
693 sdev->wdtr = 1;
694 if (inq_result[7] & 0x10)
695 sdev->sdtr = 1;
696
697 sprintf(sdev->devfs_name, "scsi/host%d/bus%d/target%d/lun%d",
698 sdev->host->host_no, sdev->channel,
699 sdev->id, sdev->lun);
700
701 /*
702 * End driverfs/devfs code.
703 */
704
705 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
706 !(*bflags & BLIST_NOTQ))
707 sdev->tagged_supported = 1;
708 /*
709 * Some devices (Texel CD ROM drives) have handshaking problems
710 * when used with the Seagate controllers. borken is initialized
711 * to 1, and then set it to 0 here.
712 */
713 if ((*bflags & BLIST_BORKEN) == 0)
714 sdev->borken = 0;
715
716 /*
717 * Apparently some really broken devices (contrary to the SCSI
718 * standards) need to be selected without asserting ATN
719 */
720 if (*bflags & BLIST_SELECT_NO_ATN)
721 sdev->select_no_atn = 1;
722
723 /*
724 * Some devices may not want to have a start command automatically
725 * issued when a device is added.
726 */
727 if (*bflags & BLIST_NOSTARTONADD)
728 sdev->no_start_on_add = 1;
729
730 if (*bflags & BLIST_SINGLELUN)
731 sdev->single_lun = 1;
732
733
734 sdev->use_10_for_rw = 1;
735
736 if (*bflags & BLIST_MS_SKIP_PAGE_08)
737 sdev->skip_ms_page_8 = 1;
738
739 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
740 sdev->skip_ms_page_3f = 1;
741
742 if (*bflags & BLIST_USE_10_BYTE_MS)
743 sdev->use_10_for_ms = 1;
744
745 /* set the device running here so that slave configure
746 * may do I/O */
747 scsi_device_set_state(sdev, SDEV_RUNNING);
748
749 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
750 sdev->use_192_bytes_for_3f = 1;
751
752 if (*bflags & BLIST_NOT_LOCKABLE)
753 sdev->lockable = 0;
754
755 if (*bflags & BLIST_RETRY_HWERROR)
756 sdev->retry_hwerror = 1;
757
758 transport_configure_device(&sdev->sdev_gendev);
759
760 if (sdev->host->hostt->slave_configure)
761 sdev->host->hostt->slave_configure(sdev);
762
763 /*
764 * Ok, the device is now all set up, we can
765 * register it and tell the rest of the kernel
766 * about it.
767 */
Alan Sternb24b1032005-07-27 11:43:46 -0700768 if (scsi_sysfs_add_sdev(sdev) != 0)
769 return SCSI_SCAN_NO_RESPONSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
771 return SCSI_SCAN_LUN_PRESENT;
772}
773
James Bottomley6f3a2022005-09-22 20:33:28 -0500774static inline void scsi_destroy_sdev(struct scsi_device *sdev)
775{
776 if (sdev->host->hostt->slave_destroy)
777 sdev->host->hostt->slave_destroy(sdev);
778 transport_destroy_device(&sdev->sdev_gendev);
779 put_device(&sdev->sdev_gendev);
780}
781
782
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783/**
784 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
785 * @starget: pointer to target device structure
786 * @lun: LUN of target device
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100787 * @sdevscan: probe the LUN corresponding to this scsi_device
788 * @sdevnew: store the value of any new scsi_device allocated
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 * @bflagsp: store bflags here if not NULL
790 *
791 * Description:
792 * Call scsi_probe_lun, if a LUN with an attached device is found,
793 * allocate and set it up by calling scsi_add_lun.
794 *
795 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100796 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
798 * attached at the LUN
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100799 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 **/
801static int scsi_probe_and_add_lun(struct scsi_target *starget,
802 uint lun, int *bflagsp,
803 struct scsi_device **sdevp, int rescan,
804 void *hostdata)
805{
806 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 unsigned char *result;
James Bottomley39216032005-06-15 18:48:29 -0500808 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
810
811 /*
812 * The rescan flag is used as an optimization, the first scan of a
813 * host adapter calls into here with rescan == 0.
814 */
James Bottomley6f3a2022005-09-22 20:33:28 -0500815 sdev = scsi_device_lookup_by_target(starget, lun);
816 if (sdev) {
817 if (rescan || sdev->sdev_state != SDEV_CREATED) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
819 "scsi scan: device exists on %s\n",
820 sdev->sdev_gendev.bus_id));
821 if (sdevp)
822 *sdevp = sdev;
823 else
824 scsi_device_put(sdev);
825
826 if (bflagsp)
827 *bflagsp = scsi_get_device_flags(sdev,
828 sdev->vendor,
829 sdev->model);
830 return SCSI_SCAN_LUN_PRESENT;
831 }
James Bottomley6f3a2022005-09-22 20:33:28 -0500832 scsi_device_put(sdev);
833 } else
834 sdev = scsi_alloc_sdev(starget, lun, hostdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 if (!sdev)
836 goto out;
James Bottomley39216032005-06-15 18:48:29 -0500837
838 result = kmalloc(result_len, GFP_ATOMIC |
Al Virobc861202005-04-24 12:28:34 -0700839 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 if (!result)
James Bottomley39216032005-06-15 18:48:29 -0500841 goto out_free_sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
James Bottomley39216032005-06-15 18:48:29 -0500843 if (scsi_probe_lun(sdev, result, result_len, &bflags))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 goto out_free_result;
845
846 /*
847 * result contains valid SCSI INQUIRY data.
848 */
849 if ((result[0] >> 5) == 3) {
850 /*
851 * For a Peripheral qualifier 3 (011b), the SCSI
852 * spec says: The device server is not capable of
853 * supporting a physical device on this logical
854 * unit.
855 *
856 * For disks, this implies that there is no
857 * logical disk configured at sdev->lun, but there
858 * is a target id responding.
859 */
860 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
861 "scsi scan: peripheral qualifier of 3,"
862 " no device added\n"));
863 res = SCSI_SCAN_TARGET_PRESENT;
864 goto out_free_result;
865 }
866
867 res = scsi_add_lun(sdev, result, &bflags);
868 if (res == SCSI_SCAN_LUN_PRESENT) {
869 if (bflags & BLIST_KEY) {
870 sdev->lockable = 0;
James Bottomley39216032005-06-15 18:48:29 -0500871 scsi_unlock_floptical(sdev, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 }
873 if (bflagsp)
874 *bflagsp = bflags;
875 }
876
877 out_free_result:
878 kfree(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 out_free_sdev:
880 if (res == SCSI_SCAN_LUN_PRESENT) {
881 if (sdevp) {
Alan Sternb70d37b2005-07-26 10:30:40 -0400882 if (scsi_device_get(sdev) == 0) {
883 *sdevp = sdev;
884 } else {
885 __scsi_remove_device(sdev);
886 res = SCSI_SCAN_NO_RESPONSE;
887 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 }
James Bottomley6f3a2022005-09-22 20:33:28 -0500889 } else
890 scsi_destroy_sdev(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 out:
892 return res;
893}
894
895/**
896 * scsi_sequential_lun_scan - sequentially scan a SCSI target
897 * @starget: pointer to target structure to scan
898 * @bflags: black/white list flag for LUN 0
899 * @lun0_res: result of scanning LUN 0
900 *
901 * Description:
902 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
903 * scanned) to some maximum lun until a LUN is found with no device
904 * attached. Use the bflags to figure out any oddities.
905 *
906 * Modifies sdevscan->lun.
907 **/
908static void scsi_sequential_lun_scan(struct scsi_target *starget,
909 int bflags, int lun0_res, int scsi_level,
910 int rescan)
911{
912 unsigned int sparse_lun, lun, max_dev_lun;
913 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
914
915 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of"
916 "%s\n", starget->dev.bus_id));
917
918 max_dev_lun = min(max_scsi_luns, shost->max_lun);
919 /*
920 * If this device is known to support sparse multiple units,
921 * override the other settings, and scan all of them. Normally,
922 * SCSI-3 devices should be scanned via the REPORT LUNS.
923 */
924 if (bflags & BLIST_SPARSELUN) {
925 max_dev_lun = shost->max_lun;
926 sparse_lun = 1;
927 } else
928 sparse_lun = 0;
929
930 /*
931 * If not sparse lun and no device attached at LUN 0 do not scan
932 * any further.
933 */
934 if (!sparse_lun && (lun0_res != SCSI_SCAN_LUN_PRESENT))
935 return;
936
937 /*
938 * If less than SCSI_1_CSS, and no special lun scaning, stop
939 * scanning; this matches 2.4 behaviour, but could just be a bug
940 * (to continue scanning a SCSI_1_CSS device).
941 *
942 * This test is broken. We might not have any device on lun0 for
943 * a sparselun device, and if that's the case then how would we
944 * know the real scsi_level, eh? It might make sense to just not
945 * scan any SCSI_1 device for non-0 luns, but that check would best
946 * go into scsi_alloc_sdev() and just have it return null when asked
947 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
948 *
949 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
950 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
951 == 0))
952 return;
953 */
954 /*
955 * If this device is known to support multiple units, override
956 * the other settings, and scan all of them.
957 */
958 if (bflags & BLIST_FORCELUN)
959 max_dev_lun = shost->max_lun;
960 /*
961 * REGAL CDC-4X: avoid hang after LUN 4
962 */
963 if (bflags & BLIST_MAX5LUN)
964 max_dev_lun = min(5U, max_dev_lun);
965 /*
966 * Do not scan SCSI-2 or lower device past LUN 7, unless
967 * BLIST_LARGELUN.
968 */
969 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
970 max_dev_lun = min(8U, max_dev_lun);
971
972 /*
973 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
974 * until we reach the max, or no LUN is found and we are not
975 * sparse_lun.
976 */
977 for (lun = 1; lun < max_dev_lun; ++lun)
978 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
979 NULL) != SCSI_SCAN_LUN_PRESENT) &&
980 !sparse_lun)
981 return;
982}
983
984/**
985 * scsilun_to_int: convert a scsi_lun to an int
986 * @scsilun: struct scsi_lun to be converted.
987 *
988 * Description:
989 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
990 * integer, and return the result. The caller must check for
991 * truncation before using this function.
992 *
993 * Notes:
994 * The struct scsi_lun is assumed to be four levels, with each level
995 * effectively containing a SCSI byte-ordered (big endian) short; the
996 * addressing bits of each level are ignored (the highest two bits).
997 * For a description of the LUN format, post SCSI-3 see the SCSI
998 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
999 *
1000 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1001 * the integer: 0x0b030a04
1002 **/
1003static int scsilun_to_int(struct scsi_lun *scsilun)
1004{
1005 int i;
1006 unsigned int lun;
1007
1008 lun = 0;
1009 for (i = 0; i < sizeof(lun); i += 2)
1010 lun = lun | (((scsilun->scsi_lun[i] << 8) |
1011 scsilun->scsi_lun[i + 1]) << (i * 8));
1012 return lun;
1013}
1014
1015/**
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001016 * int_to_scsilun: reverts an int into a scsi_lun
1017 * @int: integer to be reverted
1018 * @scsilun: struct scsi_lun to be set.
1019 *
1020 * Description:
1021 * Reverts the functionality of the scsilun_to_int, which packed
1022 * an 8-byte lun value into an int. This routine unpacks the int
1023 * back into the lun value.
1024 * Note: the scsilun_to_int() routine does not truly handle all
1025 * 8bytes of the lun value. This functions restores only as much
1026 * as was set by the routine.
1027 *
1028 * Notes:
1029 * Given an integer : 0x0b030a04, this function returns a
1030 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1031 *
1032 **/
1033void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun)
1034{
1035 int i;
1036
1037 memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
1038
1039 for (i = 0; i < sizeof(lun); i += 2) {
1040 scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
1041 scsilun->scsi_lun[i+1] = lun & 0xFF;
1042 lun = lun >> 16;
1043 }
1044}
1045EXPORT_SYMBOL(int_to_scsilun);
1046
1047/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001049 * @sdevscan: scan the host, channel, and id of this scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 *
1051 * Description:
1052 * If @sdevscan is for a SCSI-3 or up device, send a REPORT LUN
1053 * command, and scan the resulting list of LUNs by calling
1054 * scsi_probe_and_add_lun.
1055 *
1056 * Modifies sdevscan->lun.
1057 *
1058 * Return:
1059 * 0: scan completed (or no memory, so further scanning is futile)
1060 * 1: no report lun scan, or not configured
1061 **/
James Bottomley6f3a2022005-09-22 20:33:28 -05001062static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 int rescan)
1064{
1065 char devname[64];
1066 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1067 unsigned int length;
1068 unsigned int lun;
1069 unsigned int num_luns;
1070 unsigned int retries;
James Bottomley39216032005-06-15 18:48:29 -05001071 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 struct scsi_lun *lunp, *lun_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 u8 *data;
1074 struct scsi_sense_hdr sshdr;
James Bottomley6f3a2022005-09-22 20:33:28 -05001075 struct scsi_device *sdev;
1076 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
Alan Stern2ef89192005-11-08 15:51:55 -05001077 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078
1079 /*
1080 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1081 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1082 * support more than 8 LUNs.
1083 */
1084 if ((bflags & BLIST_NOREPORTLUN) ||
James Bottomley6f3a2022005-09-22 20:33:28 -05001085 starget->scsi_level < SCSI_2 ||
1086 (starget->scsi_level < SCSI_3 &&
1087 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) )
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 return 1;
1089 if (bflags & BLIST_NOLUN)
1090 return 0;
1091
James Bottomley6f3a2022005-09-22 20:33:28 -05001092 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1093 sdev = scsi_alloc_sdev(starget, 0, NULL);
1094 if (!sdev)
1095 return 0;
1096 if (scsi_device_get(sdev))
1097 return 0;
1098 }
1099
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 sprintf(devname, "host %d channel %d id %d",
James Bottomley6f3a2022005-09-22 20:33:28 -05001101 shost->host_no, sdev->channel, sdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102
1103 /*
1104 * Allocate enough to hold the header (the same size as one scsi_lun)
1105 * plus the max number of luns we are requesting.
1106 *
1107 * Reallocating and trying again (with the exact amount we need)
1108 * would be nice, but then we need to somehow limit the size
1109 * allocated based on the available memory and the limits of
1110 * kmalloc - we don't want a kmalloc() failure of a huge value to
1111 * prevent us from finding any LUNs on this target.
1112 */
1113 length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun);
1114 lun_data = kmalloc(length, GFP_ATOMIC |
1115 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
James Bottomley6f3a2022005-09-22 20:33:28 -05001116 if (!lun_data) {
1117 printk(ALLOC_FAILURE_MSG, __FUNCTION__);
James Bottomley39216032005-06-15 18:48:29 -05001118 goto out;
James Bottomley6f3a2022005-09-22 20:33:28 -05001119 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120
1121 scsi_cmd[0] = REPORT_LUNS;
1122
1123 /*
1124 * bytes 1 - 5: reserved, set to zero.
1125 */
1126 memset(&scsi_cmd[1], 0, 5);
1127
1128 /*
1129 * bytes 6 - 9: length of the command.
1130 */
1131 scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff;
1132 scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff;
1133 scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff;
1134 scsi_cmd[9] = (unsigned char) length & 0xff;
1135
1136 scsi_cmd[10] = 0; /* reserved */
1137 scsi_cmd[11] = 0; /* control */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138
1139 /*
1140 * We can get a UNIT ATTENTION, for example a power on/reset, so
1141 * retry a few times (like sd.c does for TEST UNIT READY).
1142 * Experience shows some combinations of adapter/devices get at
1143 * least two power on/resets.
1144 *
1145 * Illegal requests (for devices that do not support REPORT LUNS)
1146 * should come through as a check condition, and will not generate
1147 * a retry.
1148 */
1149 for (retries = 0; retries < 3; retries++) {
1150 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending"
1151 " REPORT LUNS to %s (try %d)\n", devname,
1152 retries));
James Bottomley39216032005-06-15 18:48:29 -05001153
James Bottomley39216032005-06-15 18:48:29 -05001154 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001155 lun_data, length, &sshdr,
James Bottomley39216032005-06-15 18:48:29 -05001156 SCSI_TIMEOUT + 4 * HZ, 3);
1157
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS"
James Bottomley39216032005-06-15 18:48:29 -05001159 " %s (try %d) result 0x%x\n", result
1160 ? "failed" : "successful", retries, result));
1161 if (result == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 break;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001163 else if (scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 if (sshdr.sense_key != UNIT_ATTENTION)
1165 break;
1166 }
1167 }
1168
James Bottomley39216032005-06-15 18:48:29 -05001169 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 /*
1171 * The device probably does not support a REPORT LUN command
1172 */
Alan Stern2ef89192005-11-08 15:51:55 -05001173 ret = 1;
1174 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176
1177 /*
1178 * Get the length from the first four bytes of lun_data.
1179 */
1180 data = (u8 *) lun_data->scsi_lun;
1181 length = ((data[0] << 24) | (data[1] << 16) |
1182 (data[2] << 8) | (data[3] << 0));
1183
1184 num_luns = (length / sizeof(struct scsi_lun));
1185 if (num_luns > max_scsi_report_luns) {
1186 printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)"
1187 " of %d luns reported, try increasing"
1188 " max_scsi_report_luns.\n", devname,
1189 max_scsi_report_luns, num_luns);
1190 num_luns = max_scsi_report_luns;
1191 }
1192
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001193 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1194 "scsi scan: REPORT LUN scan\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195
1196 /*
1197 * Scan the luns in lun_data. The entry at offset 0 is really
1198 * the header, so start at 1 and go up to and including num_luns.
1199 */
1200 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1201 lun = scsilun_to_int(lunp);
1202
1203 /*
1204 * Check if the unused part of lunp is non-zero, and so
1205 * does not fit in lun.
1206 */
1207 if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) {
1208 int i;
1209
1210 /*
1211 * Output an error displaying the LUN in byte order,
1212 * this differs from what linux would print for the
1213 * integer LUN value.
1214 */
1215 printk(KERN_WARNING "scsi: %s lun 0x", devname);
1216 data = (char *)lunp->scsi_lun;
1217 for (i = 0; i < sizeof(struct scsi_lun); i++)
1218 printk("%02x", data[i]);
1219 printk(" has a LUN larger than currently supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 } else if (lun > sdev->host->max_lun) {
1221 printk(KERN_WARNING "scsi: %s lun%d has a LUN larger"
1222 " than allowed by the host adapter\n",
1223 devname, lun);
1224 } else {
1225 int res;
1226
1227 res = scsi_probe_and_add_lun(starget,
1228 lun, NULL, NULL, rescan, NULL);
1229 if (res == SCSI_SCAN_NO_RESPONSE) {
1230 /*
1231 * Got some results, but now none, abort.
1232 */
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001233 sdev_printk(KERN_ERR, sdev,
1234 "Unexpected response"
1235 " from lun %d while scanning, scan"
1236 " aborted\n", lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237 break;
1238 }
1239 }
1240 }
1241
Alan Stern2ef89192005-11-08 15:51:55 -05001242 out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 kfree(lun_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 out:
James Bottomley6f3a2022005-09-22 20:33:28 -05001245 scsi_device_put(sdev);
1246 if (sdev->sdev_state == SDEV_CREATED)
1247 /*
1248 * the sdev we used didn't appear in the report luns scan
1249 */
1250 scsi_destroy_sdev(sdev);
Alan Stern2ef89192005-11-08 15:51:55 -05001251 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252}
1253
1254struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
1255 uint id, uint lun, void *hostdata)
1256{
1257 struct scsi_device *sdev;
1258 struct device *parent = &shost->shost_gendev;
1259 int res;
1260 struct scsi_target *starget = scsi_alloc_target(parent, channel, id);
1261
1262 if (!starget)
1263 return ERR_PTR(-ENOMEM);
1264
Nathan Lynchc92715b2005-06-02 17:15:09 -05001265 get_device(&starget->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 down(&shost->scan_mutex);
Mike Anderson82f29462005-06-16 11:14:33 -07001267 if (scsi_host_scan_allowed(shost)) {
1268 res = scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1,
1269 hostdata);
1270 if (res != SCSI_SCAN_LUN_PRESENT)
1271 sdev = ERR_PTR(-ENODEV);
1272 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 up(&shost->scan_mutex);
1274 scsi_target_reap(starget);
1275 put_device(&starget->dev);
1276
1277 return sdev;
1278}
1279EXPORT_SYMBOL(__scsi_add_device);
1280
James Bottomley146f7262005-09-10 12:44:09 -05001281int scsi_add_device(struct Scsi_Host *host, uint channel,
1282 uint target, uint lun)
1283{
1284 struct scsi_device *sdev =
1285 __scsi_add_device(host, channel, target, lun, NULL);
1286 if (IS_ERR(sdev))
1287 return PTR_ERR(sdev);
1288
1289 scsi_device_put(sdev);
1290 return 0;
1291}
1292EXPORT_SYMBOL(scsi_add_device);
1293
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294void scsi_rescan_device(struct device *dev)
1295{
1296 struct scsi_driver *drv;
1297
1298 if (!dev->driver)
1299 return;
1300
1301 drv = to_scsi_driver(dev->driver);
1302 if (try_module_get(drv->owner)) {
1303 if (drv->rescan)
1304 drv->rescan(dev);
1305 module_put(drv->owner);
1306 }
1307}
1308EXPORT_SYMBOL(scsi_rescan_device);
1309
Alan Sterne517d312005-07-26 10:18:45 -04001310static void __scsi_scan_target(struct device *parent, unsigned int channel,
1311 unsigned int id, unsigned int lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312{
1313 struct Scsi_Host *shost = dev_to_shost(parent);
1314 int bflags = 0;
1315 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 struct scsi_target *starget;
1317
1318 if (shost->this_id == id)
1319 /*
1320 * Don't scan the host adapter
1321 */
1322 return;
1323
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 if (!starget)
1326 return;
1327
1328 get_device(&starget->dev);
1329 if (lun != SCAN_WILD_CARD) {
1330 /*
1331 * Scan for a specific host/chan/id/lun.
1332 */
1333 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1334 goto out_reap;
1335 }
1336
1337 /*
1338 * Scan LUN 0, if there is some response, scan further. Ideally, we
1339 * would not configure LUN 0 until all LUNs are scanned.
1340 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001341 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1342 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1343 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 /*
1345 * The REPORT LUN did not scan the target,
1346 * do a sequential scan.
1347 */
1348 scsi_sequential_lun_scan(starget, bflags,
James Bottomley6f3a2022005-09-22 20:33:28 -05001349 res, starget->scsi_level, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351
1352 out_reap:
1353 /* now determine if the target has any children at all
1354 * and if not, nuke it */
1355 scsi_target_reap(starget);
1356
1357 put_device(&starget->dev);
1358}
Alan Sterne517d312005-07-26 10:18:45 -04001359
1360/**
1361 * scsi_scan_target - scan a target id, possibly including all LUNs on the
1362 * target.
1363 * @parent: host to scan
1364 * @channel: channel to scan
1365 * @id: target id to scan
1366 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1367 * @rescan: passed to LUN scanning routines
1368 *
1369 * Description:
1370 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1371 * and possibly all LUNs on the target id.
1372 *
1373 * First try a REPORT LUN scan, if that does not scan the target, do a
1374 * sequential scan of LUNs on the target id.
1375 **/
1376void scsi_scan_target(struct device *parent, unsigned int channel,
1377 unsigned int id, unsigned int lun, int rescan)
1378{
1379 struct Scsi_Host *shost = dev_to_shost(parent);
1380
1381 down(&shost->scan_mutex);
1382 if (scsi_host_scan_allowed(shost))
1383 __scsi_scan_target(parent, channel, id, lun, rescan);
1384 up(&shost->scan_mutex);
1385}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386EXPORT_SYMBOL(scsi_scan_target);
1387
1388static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1389 unsigned int id, unsigned int lun, int rescan)
1390{
1391 uint order_id;
1392
1393 if (id == SCAN_WILD_CARD)
1394 for (id = 0; id < shost->max_id; ++id) {
1395 /*
1396 * XXX adapter drivers when possible (FCP, iSCSI)
1397 * could modify max_id to match the current max,
1398 * not the absolute max.
1399 *
1400 * XXX add a shost id iterator, so for example,
1401 * the FC ID can be the same as a target id
1402 * without a huge overhead of sparse id's.
1403 */
1404 if (shost->reverse_ordering)
1405 /*
1406 * Scan from high to low id.
1407 */
1408 order_id = shost->max_id - id - 1;
1409 else
1410 order_id = id;
Alan Sterne517d312005-07-26 10:18:45 -04001411 __scsi_scan_target(&shost->shost_gendev, channel,
1412 order_id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413 }
1414 else
Alan Sterne517d312005-07-26 10:18:45 -04001415 __scsi_scan_target(&shost->shost_gendev, channel,
1416 id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417}
1418
1419int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1420 unsigned int id, unsigned int lun, int rescan)
1421{
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001422 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
1423 "%s: <%u:%u:%u>\n",
1424 __FUNCTION__, channel, id, lun));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425
1426 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
1427 ((id != SCAN_WILD_CARD) && (id > shost->max_id)) ||
1428 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1429 return -EINVAL;
1430
1431 down(&shost->scan_mutex);
Mike Anderson82f29462005-06-16 11:14:33 -07001432 if (scsi_host_scan_allowed(shost)) {
1433 if (channel == SCAN_WILD_CARD)
1434 for (channel = 0; channel <= shost->max_channel;
1435 channel++)
1436 scsi_scan_channel(shost, channel, id, lun,
1437 rescan);
1438 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439 scsi_scan_channel(shost, channel, id, lun, rescan);
Mike Anderson82f29462005-06-16 11:14:33 -07001440 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441 up(&shost->scan_mutex);
1442
1443 return 0;
1444}
1445
1446/**
1447 * scsi_scan_host - scan the given adapter
1448 * @shost: adapter to scan
1449 **/
1450void scsi_scan_host(struct Scsi_Host *shost)
1451{
1452 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1453 SCAN_WILD_CARD, 0);
1454}
1455EXPORT_SYMBOL(scsi_scan_host);
1456
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457void scsi_forget_host(struct Scsi_Host *shost)
1458{
Alan Sterna64358d2005-07-26 10:27:10 -04001459 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460 unsigned long flags;
1461
Alan Sterna64358d2005-07-26 10:27:10 -04001462 restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463 spin_lock_irqsave(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001464 list_for_each_entry(sdev, &shost->__devices, siblings) {
1465 if (sdev->sdev_state == SDEV_DEL)
1466 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 spin_unlock_irqrestore(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001468 __scsi_remove_device(sdev);
1469 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470 }
1471 spin_unlock_irqrestore(shost->host_lock, flags);
1472}
1473
1474/*
1475 * Function: scsi_get_host_dev()
1476 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001477 * Purpose: Create a scsi_device that points to the host adapter itself.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001479 * Arguments: SHpnt - Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480 *
1481 * Lock status: None assumed.
1482 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001483 * Returns: The scsi_device or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484 *
1485 * Notes:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001486 * Attach a single scsi_device to the Scsi_Host - this should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 * be made to look like a "pseudo-device" that points to the
1488 * HA itself.
1489 *
1490 * Note - this device is not accessible from any high-level
1491 * drivers (including generics), which is probably not
1492 * optimal. We can add hooks later to attach
1493 */
1494struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1495{
Alan Sterne517d312005-07-26 10:18:45 -04001496 struct scsi_device *sdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497 struct scsi_target *starget;
1498
Alan Sterne517d312005-07-26 10:18:45 -04001499 down(&shost->scan_mutex);
1500 if (!scsi_host_scan_allowed(shost))
1501 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1503 if (!starget)
Alan Sterne517d312005-07-26 10:18:45 -04001504 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505
1506 sdev = scsi_alloc_sdev(starget, 0, NULL);
1507 if (sdev) {
1508 sdev->sdev_gendev.parent = get_device(&starget->dev);
1509 sdev->borken = 0;
1510 }
1511 put_device(&starget->dev);
Alan Sterne517d312005-07-26 10:18:45 -04001512 out:
1513 up(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514 return sdev;
1515}
1516EXPORT_SYMBOL(scsi_get_host_dev);
1517
1518/*
1519 * Function: scsi_free_host_dev()
1520 *
1521 * Purpose: Free a scsi_device that points to the host adapter itself.
1522 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001523 * Arguments: SHpnt - Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524 *
1525 * Lock status: None assumed.
1526 *
1527 * Returns: Nothing
1528 *
1529 * Notes:
1530 */
1531void scsi_free_host_dev(struct scsi_device *sdev)
1532{
1533 BUG_ON(sdev->id != sdev->host->this_id);
1534
James Bottomley6f3a2022005-09-22 20:33:28 -05001535 scsi_destroy_sdev(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536}
1537EXPORT_SYMBOL(scsi_free_host_dev);
1538