blob: 74863da1d630a2df419c2bb75ea0e5962ee5ba47 [file] [log] [blame]
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
Arjan van de Ven0ad78202005-11-28 16:22:25 +010077static const char *scsi_null_device_strs = "nullnullnullnull";
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
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
Jes Sorensen24669f752006-01-16 10:31:18 -0500208 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 GFP_ATOMIC);
210 if (!sdev)
211 goto out;
212
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 sdev->vendor = scsi_null_device_strs;
214 sdev->model = scsi_null_device_strs;
215 sdev->rev = scsi_null_device_strs;
216 sdev->host = shost;
217 sdev->id = starget->id;
218 sdev->lun = lun;
219 sdev->channel = starget->channel;
220 sdev->sdev_state = SDEV_CREATED;
221 INIT_LIST_HEAD(&sdev->siblings);
222 INIT_LIST_HEAD(&sdev->same_target_siblings);
223 INIT_LIST_HEAD(&sdev->cmd_list);
224 INIT_LIST_HEAD(&sdev->starved_entry);
225 spin_lock_init(&sdev->list_lock);
226
227 sdev->sdev_gendev.parent = get_device(&starget->dev);
228 sdev->sdev_target = starget;
229
230 /* usually NULL and set by ->slave_alloc instead */
231 sdev->hostdata = hostdata;
232
233 /* if the device needs this changing, it may do so in the
234 * slave_configure function */
235 sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
236
237 /*
238 * Some low level driver could use device->type
239 */
240 sdev->type = -1;
241
242 /*
243 * Assume that the device will have handshaking problems,
244 * and then fix this field later if it turns out it
245 * doesn't
246 */
247 sdev->borken = 1;
248
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 sdev->request_queue = scsi_alloc_queue(sdev);
250 if (!sdev->request_queue) {
251 /* release fn is set up in scsi_sysfs_device_initialise, so
252 * have to free and put manually here */
253 put_device(&starget->dev);
254 goto out;
255 }
256
257 sdev->request_queue->queuedata = sdev;
258 scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
259
260 scsi_sysfs_device_initialize(sdev);
261
262 if (shost->hostt->slave_alloc) {
263 ret = shost->hostt->slave_alloc(sdev);
264 if (ret) {
265 /*
266 * if LLDD reports slave not present, don't clutter
267 * console with alloc failure messages
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 */
269 if (ret == -ENXIO)
270 display_failure_msg = 0;
271 goto out_device_destroy;
272 }
273 }
274
275 return sdev;
276
277out_device_destroy:
278 transport_destroy_device(&sdev->sdev_gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 put_device(&sdev->sdev_gendev);
280out:
281 if (display_failure_msg)
282 printk(ALLOC_FAILURE_MSG, __FUNCTION__);
283 return NULL;
284}
285
286static void scsi_target_dev_release(struct device *dev)
287{
288 struct device *parent = dev->parent;
289 struct scsi_target *starget = to_scsi_target(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500290 struct Scsi_Host *shost = dev_to_shost(parent);
291
292 if (shost->hostt->target_destroy)
293 shost->hostt->target_destroy(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 kfree(starget);
295 put_device(parent);
296}
297
298int scsi_is_target_device(const struct device *dev)
299{
300 return dev->release == scsi_target_dev_release;
301}
302EXPORT_SYMBOL(scsi_is_target_device);
303
304static struct scsi_target *__scsi_find_target(struct device *parent,
305 int channel, uint id)
306{
307 struct scsi_target *starget, *found_starget = NULL;
308 struct Scsi_Host *shost = dev_to_shost(parent);
309 /*
310 * Search for an existing target for this sdev.
311 */
312 list_for_each_entry(starget, &shost->__targets, siblings) {
313 if (starget->id == id &&
314 starget->channel == channel) {
315 found_starget = starget;
316 break;
317 }
318 }
319 if (found_starget)
320 get_device(&found_starget->dev);
321
322 return found_starget;
323}
324
325static struct scsi_target *scsi_alloc_target(struct device *parent,
326 int channel, uint id)
327{
328 struct Scsi_Host *shost = dev_to_shost(parent);
329 struct device *dev = NULL;
330 unsigned long flags;
331 const int size = sizeof(struct scsi_target)
332 + shost->transportt->target_size;
James.Smart@Emulex.Com5c44cd22005-06-10 22:24:30 -0400333 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 struct scsi_target *found_target;
335
Jes Sorensen24669f752006-01-16 10:31:18 -0500336 starget = kzalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 if (!starget) {
338 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
339 return NULL;
340 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 dev = &starget->dev;
342 device_initialize(dev);
343 starget->reap_ref = 1;
344 dev->parent = get_device(parent);
345 dev->release = scsi_target_dev_release;
346 sprintf(dev->bus_id, "target%d:%d:%d",
347 shost->host_no, channel, id);
348 starget->id = id;
349 starget->channel = channel;
350 INIT_LIST_HEAD(&starget->siblings);
351 INIT_LIST_HEAD(&starget->devices);
352 spin_lock_irqsave(shost->host_lock, flags);
353
354 found_target = __scsi_find_target(parent, channel, id);
355 if (found_target)
356 goto found;
357
358 list_add_tail(&starget->siblings, &shost->__targets);
359 spin_unlock_irqrestore(shost->host_lock, flags);
360 /* allocate and add */
James Bottomleya283bd32005-05-24 12:06:38 -0500361 transport_setup_device(dev);
362 device_add(dev);
363 transport_add_device(dev);
364 if (shost->hostt->target_alloc) {
365 int error = shost->hostt->target_alloc(starget);
366
367 if(error) {
368 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
369 /* don't want scsi_target_reap to do the final
370 * put because it will be under the host lock */
371 get_device(dev);
372 scsi_target_reap(starget);
373 put_device(dev);
374 return NULL;
375 }
376 }
377
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 return starget;
379
380 found:
381 found_target->reap_ref++;
382 spin_unlock_irqrestore(shost->host_lock, flags);
383 put_device(parent);
384 kfree(starget);
385 return found_target;
386}
387
James Bottomley65110b22006-02-14 10:48:46 -0600388static void scsi_target_reap_usercontext(void *data)
389{
390 struct scsi_target *starget = data;
James Bottomley863a9302005-12-15 20:01:43 -0800391 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
392 unsigned long flags;
393
James Bottomley863a9302005-12-15 20:01:43 -0800394 spin_lock_irqsave(shost->host_lock, flags);
395
396 if (--starget->reap_ref == 0 && list_empty(&starget->devices)) {
397 list_del_init(&starget->siblings);
398 spin_unlock_irqrestore(shost->host_lock, flags);
James Bottomley04333392005-12-26 09:58:49 -0600399 transport_remove_device(&starget->dev);
James Bottomley863a9302005-12-15 20:01:43 -0800400 device_del(&starget->dev);
James Bottomley04333392005-12-26 09:58:49 -0600401 transport_destroy_device(&starget->dev);
James Bottomley863a9302005-12-15 20:01:43 -0800402 put_device(&starget->dev);
403 return;
404
405 }
406 spin_unlock_irqrestore(shost->host_lock, flags);
407
408 return;
409}
410
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411/**
412 * scsi_target_reap - check to see if target is in use and destroy if not
413 *
414 * @starget: target to be checked
415 *
416 * This is used after removing a LUN or doing a last put of the target
417 * it checks atomically that nothing is using the target and removes
418 * it if so.
419 */
420void scsi_target_reap(struct scsi_target *starget)
421{
James Bottomley65110b22006-02-14 10:48:46 -0600422 scsi_execute_in_process_context(scsi_target_reap_usercontext, starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423}
424
425/**
426 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
James Bottomley39216032005-06-15 18:48:29 -0500427 * @sdev: scsi_device to probe
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 * @inq_result: area to store the INQUIRY result
James Bottomley39216032005-06-15 18:48:29 -0500429 * @result_len: len of inq_result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 * @bflags: store any bflags found here
431 *
432 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500433 * Probe the lun associated with @req using a standard SCSI INQUIRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 *
James Bottomley39216032005-06-15 18:48:29 -0500435 * If the INQUIRY is successful, zero is returned and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100437 * are copied to the scsi_device any flags value is stored in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 **/
James Bottomley39216032005-06-15 18:48:29 -0500439static int scsi_probe_lun(struct scsi_device *sdev, char *inq_result,
440 int result_len, int *bflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
443 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
444 int response_len = 0;
James Bottomley39216032005-06-15 18:48:29 -0500445 int pass, count, result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 struct scsi_sense_hdr sshdr;
447
448 *bflags = 0;
449
450 /* Perform up to 3 passes. The first pass uses a conservative
451 * transfer length of 36 unless sdev->inquiry_len specifies a
452 * different value. */
453 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
454 try_inquiry_len = first_inquiry_len;
455 pass = 1;
456
457 next_pass:
James Bottomley9ccfc752005-10-02 11:45:08 -0500458 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
459 "scsi scan: INQUIRY pass %d length %d\n",
460 pass, try_inquiry_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
462 /* Each pass gets up to three chances to ignore Unit Attention */
463 for (count = 0; count < 3; ++count) {
464 memset(scsi_cmd, 0, 6);
465 scsi_cmd[0] = INQUIRY;
466 scsi_cmd[4] = (unsigned char) try_inquiry_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
468 memset(inq_result, 0, try_inquiry_len);
James Bottomley39216032005-06-15 18:48:29 -0500469
470 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -0500471 inq_result, try_inquiry_len, &sshdr,
James Bottomley39216032005-06-15 18:48:29 -0500472 HZ / 2 + HZ * scsi_inq_timeout, 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
474 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
475 "with code 0x%x\n",
James Bottomley39216032005-06-15 18:48:29 -0500476 result ? "failed" : "successful", result));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
James Bottomley39216032005-06-15 18:48:29 -0500478 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 /*
480 * not-ready to ready transition [asc/ascq=0x28/0x0]
481 * or power-on, reset [asc/ascq=0x29/0x0], continue.
482 * INQUIRY should not yield UNIT_ATTENTION
483 * but many buggy devices do so anyway.
484 */
James Bottomley39216032005-06-15 18:48:29 -0500485 if ((driver_byte(result) & DRIVER_SENSE) &&
James Bottomleyea73a9f2005-08-28 11:33:52 -0500486 scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 if ((sshdr.sense_key == UNIT_ATTENTION) &&
488 ((sshdr.asc == 0x28) ||
489 (sshdr.asc == 0x29)) &&
490 (sshdr.ascq == 0))
491 continue;
492 }
493 }
494 break;
495 }
496
James Bottomley39216032005-06-15 18:48:29 -0500497 if (result == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 response_len = (unsigned char) inq_result[4] + 5;
499 if (response_len > 255)
500 response_len = first_inquiry_len; /* sanity */
501
502 /*
503 * Get any flags for this device.
504 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100505 * XXX add a bflags to scsi_device, and replace the
506 * corresponding bit fields in scsi_device, so bflags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 * need not be passed as an argument.
508 */
509 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
510 &inq_result[16]);
511
512 /* When the first pass succeeds we gain information about
513 * what larger transfer lengths might work. */
514 if (pass == 1) {
515 if (BLIST_INQUIRY_36 & *bflags)
516 next_inquiry_len = 36;
517 else if (BLIST_INQUIRY_58 & *bflags)
518 next_inquiry_len = 58;
519 else if (sdev->inquiry_len)
520 next_inquiry_len = sdev->inquiry_len;
521 else
522 next_inquiry_len = response_len;
523
524 /* If more data is available perform the second pass */
525 if (next_inquiry_len > try_inquiry_len) {
526 try_inquiry_len = next_inquiry_len;
527 pass = 2;
528 goto next_pass;
529 }
530 }
531
532 } else if (pass == 2) {
533 printk(KERN_INFO "scsi scan: %d byte inquiry failed. "
534 "Consider BLIST_INQUIRY_36 for this device\n",
535 try_inquiry_len);
536
537 /* If this pass failed, the third pass goes back and transfers
538 * the same amount as we successfully got in the first pass. */
539 try_inquiry_len = first_inquiry_len;
540 pass = 3;
541 goto next_pass;
542 }
543
544 /* If the last transfer attempt got an error, assume the
545 * peripheral doesn't exist or is dead. */
James Bottomley39216032005-06-15 18:48:29 -0500546 if (result)
547 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548
549 /* Don't report any more data than the device says is valid */
550 sdev->inquiry_len = min(try_inquiry_len, response_len);
551
552 /*
553 * XXX Abort if the response length is less than 36? If less than
554 * 32, the lookup of the device flags (above) could be invalid,
555 * and it would be possible to take an incorrect action - we do
556 * not want to hang because of a short INQUIRY. On the flip side,
557 * if the device is spun down or becoming ready (and so it gives a
558 * short INQUIRY), an abort here prevents any further use of the
559 * device, including spin up.
560 *
561 * Related to the above issue:
562 *
563 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
564 * and if not ready, sent a START_STOP to start (maybe spin up) and
565 * then send the INQUIRY again, since the INQUIRY can change after
566 * a device is initialized.
567 *
568 * Ideally, start a device if explicitly asked to do so. This
569 * assumes that a device is spun up on power on, spun down on
570 * request, and then spun up on request.
571 */
572
573 /*
574 * The scanning code needs to know the scsi_level, even if no
575 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
576 * non-zero LUNs can be scanned.
577 */
578 sdev->scsi_level = inq_result[2] & 0x07;
579 if (sdev->scsi_level >= 2 ||
580 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
581 sdev->scsi_level++;
James Bottomley6f3a2022005-09-22 20:33:28 -0500582 sdev->sdev_target->scsi_level = sdev->scsi_level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583
James Bottomley39216032005-06-15 18:48:29 -0500584 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585}
586
587/**
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100588 * scsi_add_lun - allocate and fully initialze a scsi_device
589 * @sdevscan: holds information to be stored in the new scsi_device
590 * @sdevnew: store the address of the newly allocated scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 * @inq_result: holds the result of a previous INQUIRY to the LUN
592 * @bflags: black/white list flag
593 *
594 * Description:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100595 * Allocate and initialize a scsi_device matching sdevscan. Optionally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 * set fields based on values in *@bflags. If @sdevnew is not
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100597 * NULL, store the address of the new scsi_device in *@sdevnew (needed
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 * when scanning a particular LUN).
599 *
600 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100601 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
602 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 **/
604static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags)
605{
606 /*
607 * XXX do not save the inquiry, since it can change underneath us,
608 * save just vendor/model/rev.
609 *
610 * Rather than save it and have an ioctl that retrieves the saved
611 * value, have an ioctl that executes the same INQUIRY code used
612 * in scsi_probe_lun, let user level programs doing INQUIRY
613 * scanning run at their own risk, or supply a user level program
614 * that can correctly scan.
615 */
616 sdev->inquiry = kmalloc(sdev->inquiry_len, GFP_ATOMIC);
617 if (sdev->inquiry == NULL) {
618 return SCSI_SCAN_NO_RESPONSE;
619 }
620
621 memcpy(sdev->inquiry, inq_result, sdev->inquiry_len);
622 sdev->vendor = (char *) (sdev->inquiry + 8);
623 sdev->model = (char *) (sdev->inquiry + 16);
624 sdev->rev = (char *) (sdev->inquiry + 32);
625
626 if (*bflags & BLIST_ISROM) {
627 /*
628 * It would be better to modify sdev->type, and set
629 * sdev->removable, but then the print_inquiry() output
630 * would not show TYPE_ROM; if print_inquiry() is removed
631 * the issue goes away.
632 */
633 inq_result[0] = TYPE_ROM;
634 inq_result[1] |= 0x80; /* removable */
635 } else if (*bflags & BLIST_NO_ULD_ATTACH)
636 sdev->no_uld_attach = 1;
637
638 switch (sdev->type = (inq_result[0] & 0x1f)) {
639 case TYPE_TAPE:
640 case TYPE_DISK:
641 case TYPE_PRINTER:
642 case TYPE_MOD:
643 case TYPE_PROCESSOR:
644 case TYPE_SCANNER:
645 case TYPE_MEDIUM_CHANGER:
646 case TYPE_ENCLOSURE:
647 case TYPE_COMM:
Al Viro 631e8a12005-05-16 01:59:55 +0100648 case TYPE_RBC:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 sdev->writeable = 1;
650 break;
651 case TYPE_WORM:
652 case TYPE_ROM:
653 sdev->writeable = 0;
654 break;
655 default:
656 printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type);
657 }
658
659 print_inquiry(inq_result);
660
661 /*
662 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
663 * spec says: The device server is capable of supporting the
664 * specified peripheral device type on this logical unit. However,
665 * the physical device is not currently connected to this logical
666 * unit.
667 *
668 * The above is vague, as it implies that we could treat 001 and
669 * 011 the same. Stay compatible with previous code, and create a
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100670 * scsi_device for a PQ of 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 *
672 * Don't set the device offline here; rather let the upper
673 * level drivers eval the PQ to decide whether they should
674 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
675 */
676
677 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
678 sdev->removable = (0x80 & inq_result[1]) >> 7;
679 sdev->lockable = sdev->removable;
680 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
681
682 if (sdev->scsi_level >= SCSI_3 || (sdev->inquiry_len > 56 &&
683 inq_result[56] & 0x04))
684 sdev->ppr = 1;
685 if (inq_result[7] & 0x60)
686 sdev->wdtr = 1;
687 if (inq_result[7] & 0x10)
688 sdev->sdtr = 1;
689
690 sprintf(sdev->devfs_name, "scsi/host%d/bus%d/target%d/lun%d",
691 sdev->host->host_no, sdev->channel,
692 sdev->id, sdev->lun);
693
694 /*
695 * End driverfs/devfs code.
696 */
697
698 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
699 !(*bflags & BLIST_NOTQ))
700 sdev->tagged_supported = 1;
701 /*
702 * Some devices (Texel CD ROM drives) have handshaking problems
703 * when used with the Seagate controllers. borken is initialized
704 * to 1, and then set it to 0 here.
705 */
706 if ((*bflags & BLIST_BORKEN) == 0)
707 sdev->borken = 0;
708
709 /*
710 * Apparently some really broken devices (contrary to the SCSI
711 * standards) need to be selected without asserting ATN
712 */
713 if (*bflags & BLIST_SELECT_NO_ATN)
714 sdev->select_no_atn = 1;
715
716 /*
717 * Some devices may not want to have a start command automatically
718 * issued when a device is added.
719 */
720 if (*bflags & BLIST_NOSTARTONADD)
721 sdev->no_start_on_add = 1;
722
723 if (*bflags & BLIST_SINGLELUN)
724 sdev->single_lun = 1;
725
726
727 sdev->use_10_for_rw = 1;
728
729 if (*bflags & BLIST_MS_SKIP_PAGE_08)
730 sdev->skip_ms_page_8 = 1;
731
732 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
733 sdev->skip_ms_page_3f = 1;
734
735 if (*bflags & BLIST_USE_10_BYTE_MS)
736 sdev->use_10_for_ms = 1;
737
738 /* set the device running here so that slave configure
739 * may do I/O */
740 scsi_device_set_state(sdev, SDEV_RUNNING);
741
742 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
743 sdev->use_192_bytes_for_3f = 1;
744
745 if (*bflags & BLIST_NOT_LOCKABLE)
746 sdev->lockable = 0;
747
748 if (*bflags & BLIST_RETRY_HWERROR)
749 sdev->retry_hwerror = 1;
750
751 transport_configure_device(&sdev->sdev_gendev);
752
753 if (sdev->host->hostt->slave_configure)
754 sdev->host->hostt->slave_configure(sdev);
755
756 /*
757 * Ok, the device is now all set up, we can
758 * register it and tell the rest of the kernel
759 * about it.
760 */
Alan Sternb24b1032005-07-27 11:43:46 -0700761 if (scsi_sysfs_add_sdev(sdev) != 0)
762 return SCSI_SCAN_NO_RESPONSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763
764 return SCSI_SCAN_LUN_PRESENT;
765}
766
James Bottomley6f3a2022005-09-22 20:33:28 -0500767static inline void scsi_destroy_sdev(struct scsi_device *sdev)
768{
769 if (sdev->host->hostt->slave_destroy)
770 sdev->host->hostt->slave_destroy(sdev);
771 transport_destroy_device(&sdev->sdev_gendev);
772 put_device(&sdev->sdev_gendev);
773}
774
775
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776/**
777 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
778 * @starget: pointer to target device structure
779 * @lun: LUN of target device
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100780 * @sdevscan: probe the LUN corresponding to this scsi_device
781 * @sdevnew: store the value of any new scsi_device allocated
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 * @bflagsp: store bflags here if not NULL
783 *
784 * Description:
785 * Call scsi_probe_lun, if a LUN with an attached device is found,
786 * allocate and set it up by calling scsi_add_lun.
787 *
788 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100789 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
791 * attached at the LUN
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100792 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 **/
794static int scsi_probe_and_add_lun(struct scsi_target *starget,
795 uint lun, int *bflagsp,
796 struct scsi_device **sdevp, int rescan,
797 void *hostdata)
798{
799 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 unsigned char *result;
James Bottomley39216032005-06-15 18:48:29 -0500801 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
803
804 /*
805 * The rescan flag is used as an optimization, the first scan of a
806 * host adapter calls into here with rescan == 0.
807 */
James Bottomley6f3a2022005-09-22 20:33:28 -0500808 sdev = scsi_device_lookup_by_target(starget, lun);
809 if (sdev) {
810 if (rescan || sdev->sdev_state != SDEV_CREATED) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
812 "scsi scan: device exists on %s\n",
813 sdev->sdev_gendev.bus_id));
814 if (sdevp)
815 *sdevp = sdev;
816 else
817 scsi_device_put(sdev);
818
819 if (bflagsp)
820 *bflagsp = scsi_get_device_flags(sdev,
821 sdev->vendor,
822 sdev->model);
823 return SCSI_SCAN_LUN_PRESENT;
824 }
James Bottomley6f3a2022005-09-22 20:33:28 -0500825 scsi_device_put(sdev);
826 } else
827 sdev = scsi_alloc_sdev(starget, lun, hostdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 if (!sdev)
829 goto out;
James Bottomley39216032005-06-15 18:48:29 -0500830
831 result = kmalloc(result_len, GFP_ATOMIC |
Al Virobc861202005-04-24 12:28:34 -0700832 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 if (!result)
James Bottomley39216032005-06-15 18:48:29 -0500834 goto out_free_sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835
James Bottomley39216032005-06-15 18:48:29 -0500836 if (scsi_probe_lun(sdev, result, result_len, &bflags))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 goto out_free_result;
838
839 /*
840 * result contains valid SCSI INQUIRY data.
841 */
842 if ((result[0] >> 5) == 3) {
843 /*
844 * For a Peripheral qualifier 3 (011b), the SCSI
845 * spec says: The device server is not capable of
846 * supporting a physical device on this logical
847 * unit.
848 *
849 * For disks, this implies that there is no
850 * logical disk configured at sdev->lun, but there
851 * is a target id responding.
852 */
853 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
854 "scsi scan: peripheral qualifier of 3,"
855 " no device added\n"));
856 res = SCSI_SCAN_TARGET_PRESENT;
857 goto out_free_result;
858 }
859
860 res = scsi_add_lun(sdev, result, &bflags);
861 if (res == SCSI_SCAN_LUN_PRESENT) {
862 if (bflags & BLIST_KEY) {
863 sdev->lockable = 0;
James Bottomley39216032005-06-15 18:48:29 -0500864 scsi_unlock_floptical(sdev, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 }
866 if (bflagsp)
867 *bflagsp = bflags;
868 }
869
870 out_free_result:
871 kfree(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 out_free_sdev:
873 if (res == SCSI_SCAN_LUN_PRESENT) {
874 if (sdevp) {
Alan Sternb70d37b2005-07-26 10:30:40 -0400875 if (scsi_device_get(sdev) == 0) {
876 *sdevp = sdev;
877 } else {
878 __scsi_remove_device(sdev);
879 res = SCSI_SCAN_NO_RESPONSE;
880 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 }
James Bottomley6f3a2022005-09-22 20:33:28 -0500882 } else
883 scsi_destroy_sdev(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 out:
885 return res;
886}
887
888/**
889 * scsi_sequential_lun_scan - sequentially scan a SCSI target
890 * @starget: pointer to target structure to scan
891 * @bflags: black/white list flag for LUN 0
892 * @lun0_res: result of scanning LUN 0
893 *
894 * Description:
895 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
896 * scanned) to some maximum lun until a LUN is found with no device
897 * attached. Use the bflags to figure out any oddities.
898 *
899 * Modifies sdevscan->lun.
900 **/
901static void scsi_sequential_lun_scan(struct scsi_target *starget,
902 int bflags, int lun0_res, int scsi_level,
903 int rescan)
904{
905 unsigned int sparse_lun, lun, max_dev_lun;
906 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
907
908 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of"
909 "%s\n", starget->dev.bus_id));
910
911 max_dev_lun = min(max_scsi_luns, shost->max_lun);
912 /*
913 * If this device is known to support sparse multiple units,
914 * override the other settings, and scan all of them. Normally,
915 * SCSI-3 devices should be scanned via the REPORT LUNS.
916 */
917 if (bflags & BLIST_SPARSELUN) {
918 max_dev_lun = shost->max_lun;
919 sparse_lun = 1;
920 } else
921 sparse_lun = 0;
922
923 /*
924 * If not sparse lun and no device attached at LUN 0 do not scan
925 * any further.
926 */
927 if (!sparse_lun && (lun0_res != SCSI_SCAN_LUN_PRESENT))
928 return;
929
930 /*
931 * If less than SCSI_1_CSS, and no special lun scaning, stop
932 * scanning; this matches 2.4 behaviour, but could just be a bug
933 * (to continue scanning a SCSI_1_CSS device).
934 *
935 * This test is broken. We might not have any device on lun0 for
936 * a sparselun device, and if that's the case then how would we
937 * know the real scsi_level, eh? It might make sense to just not
938 * scan any SCSI_1 device for non-0 luns, but that check would best
939 * go into scsi_alloc_sdev() and just have it return null when asked
940 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
941 *
942 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
943 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
944 == 0))
945 return;
946 */
947 /*
948 * If this device is known to support multiple units, override
949 * the other settings, and scan all of them.
950 */
951 if (bflags & BLIST_FORCELUN)
952 max_dev_lun = shost->max_lun;
953 /*
954 * REGAL CDC-4X: avoid hang after LUN 4
955 */
956 if (bflags & BLIST_MAX5LUN)
957 max_dev_lun = min(5U, max_dev_lun);
958 /*
959 * Do not scan SCSI-2 or lower device past LUN 7, unless
960 * BLIST_LARGELUN.
961 */
962 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
963 max_dev_lun = min(8U, max_dev_lun);
964
965 /*
966 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
967 * until we reach the max, or no LUN is found and we are not
968 * sparse_lun.
969 */
970 for (lun = 1; lun < max_dev_lun; ++lun)
971 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
972 NULL) != SCSI_SCAN_LUN_PRESENT) &&
973 !sparse_lun)
974 return;
975}
976
977/**
978 * scsilun_to_int: convert a scsi_lun to an int
979 * @scsilun: struct scsi_lun to be converted.
980 *
981 * Description:
982 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
983 * integer, and return the result. The caller must check for
984 * truncation before using this function.
985 *
986 * Notes:
987 * The struct scsi_lun is assumed to be four levels, with each level
988 * effectively containing a SCSI byte-ordered (big endian) short; the
989 * addressing bits of each level are ignored (the highest two bits).
990 * For a description of the LUN format, post SCSI-3 see the SCSI
991 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
992 *
993 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
994 * the integer: 0x0b030a04
995 **/
996static int scsilun_to_int(struct scsi_lun *scsilun)
997{
998 int i;
999 unsigned int lun;
1000
1001 lun = 0;
1002 for (i = 0; i < sizeof(lun); i += 2)
1003 lun = lun | (((scsilun->scsi_lun[i] << 8) |
1004 scsilun->scsi_lun[i + 1]) << (i * 8));
1005 return lun;
1006}
1007
1008/**
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001009 * int_to_scsilun: reverts an int into a scsi_lun
1010 * @int: integer to be reverted
1011 * @scsilun: struct scsi_lun to be set.
1012 *
1013 * Description:
1014 * Reverts the functionality of the scsilun_to_int, which packed
1015 * an 8-byte lun value into an int. This routine unpacks the int
1016 * back into the lun value.
1017 * Note: the scsilun_to_int() routine does not truly handle all
1018 * 8bytes of the lun value. This functions restores only as much
1019 * as was set by the routine.
1020 *
1021 * Notes:
1022 * Given an integer : 0x0b030a04, this function returns a
1023 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1024 *
1025 **/
1026void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun)
1027{
1028 int i;
1029
1030 memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
1031
1032 for (i = 0; i < sizeof(lun); i += 2) {
1033 scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
1034 scsilun->scsi_lun[i+1] = lun & 0xFF;
1035 lun = lun >> 16;
1036 }
1037}
1038EXPORT_SYMBOL(int_to_scsilun);
1039
1040/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001042 * @sdevscan: scan the host, channel, and id of this scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 *
1044 * Description:
1045 * If @sdevscan is for a SCSI-3 or up device, send a REPORT LUN
1046 * command, and scan the resulting list of LUNs by calling
1047 * scsi_probe_and_add_lun.
1048 *
1049 * Modifies sdevscan->lun.
1050 *
1051 * Return:
1052 * 0: scan completed (or no memory, so further scanning is futile)
1053 * 1: no report lun scan, or not configured
1054 **/
James Bottomley6f3a2022005-09-22 20:33:28 -05001055static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 int rescan)
1057{
1058 char devname[64];
1059 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1060 unsigned int length;
1061 unsigned int lun;
1062 unsigned int num_luns;
1063 unsigned int retries;
James Bottomley39216032005-06-15 18:48:29 -05001064 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 struct scsi_lun *lunp, *lun_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 u8 *data;
1067 struct scsi_sense_hdr sshdr;
James Bottomley6f3a2022005-09-22 20:33:28 -05001068 struct scsi_device *sdev;
1069 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
Alan Stern2ef89192005-11-08 15:51:55 -05001070 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071
1072 /*
1073 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1074 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1075 * support more than 8 LUNs.
1076 */
1077 if ((bflags & BLIST_NOREPORTLUN) ||
James Bottomley6f3a2022005-09-22 20:33:28 -05001078 starget->scsi_level < SCSI_2 ||
1079 (starget->scsi_level < SCSI_3 &&
1080 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) )
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 return 1;
1082 if (bflags & BLIST_NOLUN)
1083 return 0;
1084
James Bottomley6f3a2022005-09-22 20:33:28 -05001085 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1086 sdev = scsi_alloc_sdev(starget, 0, NULL);
1087 if (!sdev)
1088 return 0;
1089 if (scsi_device_get(sdev))
1090 return 0;
1091 }
1092
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 sprintf(devname, "host %d channel %d id %d",
James Bottomley6f3a2022005-09-22 20:33:28 -05001094 shost->host_no, sdev->channel, sdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095
1096 /*
1097 * Allocate enough to hold the header (the same size as one scsi_lun)
1098 * plus the max number of luns we are requesting.
1099 *
1100 * Reallocating and trying again (with the exact amount we need)
1101 * would be nice, but then we need to somehow limit the size
1102 * allocated based on the available memory and the limits of
1103 * kmalloc - we don't want a kmalloc() failure of a huge value to
1104 * prevent us from finding any LUNs on this target.
1105 */
1106 length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun);
1107 lun_data = kmalloc(length, GFP_ATOMIC |
1108 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
James Bottomley6f3a2022005-09-22 20:33:28 -05001109 if (!lun_data) {
1110 printk(ALLOC_FAILURE_MSG, __FUNCTION__);
James Bottomley39216032005-06-15 18:48:29 -05001111 goto out;
James Bottomley6f3a2022005-09-22 20:33:28 -05001112 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113
1114 scsi_cmd[0] = REPORT_LUNS;
1115
1116 /*
1117 * bytes 1 - 5: reserved, set to zero.
1118 */
1119 memset(&scsi_cmd[1], 0, 5);
1120
1121 /*
1122 * bytes 6 - 9: length of the command.
1123 */
1124 scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff;
1125 scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff;
1126 scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff;
1127 scsi_cmd[9] = (unsigned char) length & 0xff;
1128
1129 scsi_cmd[10] = 0; /* reserved */
1130 scsi_cmd[11] = 0; /* control */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131
1132 /*
1133 * We can get a UNIT ATTENTION, for example a power on/reset, so
1134 * retry a few times (like sd.c does for TEST UNIT READY).
1135 * Experience shows some combinations of adapter/devices get at
1136 * least two power on/resets.
1137 *
1138 * Illegal requests (for devices that do not support REPORT LUNS)
1139 * should come through as a check condition, and will not generate
1140 * a retry.
1141 */
1142 for (retries = 0; retries < 3; retries++) {
1143 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending"
1144 " REPORT LUNS to %s (try %d)\n", devname,
1145 retries));
James Bottomley39216032005-06-15 18:48:29 -05001146
James Bottomley39216032005-06-15 18:48:29 -05001147 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001148 lun_data, length, &sshdr,
James Bottomley39216032005-06-15 18:48:29 -05001149 SCSI_TIMEOUT + 4 * HZ, 3);
1150
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS"
James Bottomley39216032005-06-15 18:48:29 -05001152 " %s (try %d) result 0x%x\n", result
1153 ? "failed" : "successful", retries, result));
1154 if (result == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 break;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001156 else if (scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 if (sshdr.sense_key != UNIT_ATTENTION)
1158 break;
1159 }
1160 }
1161
James Bottomley39216032005-06-15 18:48:29 -05001162 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163 /*
1164 * The device probably does not support a REPORT LUN command
1165 */
Alan Stern2ef89192005-11-08 15:51:55 -05001166 ret = 1;
1167 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169
1170 /*
1171 * Get the length from the first four bytes of lun_data.
1172 */
1173 data = (u8 *) lun_data->scsi_lun;
1174 length = ((data[0] << 24) | (data[1] << 16) |
1175 (data[2] << 8) | (data[3] << 0));
1176
1177 num_luns = (length / sizeof(struct scsi_lun));
1178 if (num_luns > max_scsi_report_luns) {
1179 printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)"
1180 " of %d luns reported, try increasing"
1181 " max_scsi_report_luns.\n", devname,
1182 max_scsi_report_luns, num_luns);
1183 num_luns = max_scsi_report_luns;
1184 }
1185
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001186 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1187 "scsi scan: REPORT LUN scan\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188
1189 /*
1190 * Scan the luns in lun_data. The entry at offset 0 is really
1191 * the header, so start at 1 and go up to and including num_luns.
1192 */
1193 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1194 lun = scsilun_to_int(lunp);
1195
1196 /*
1197 * Check if the unused part of lunp is non-zero, and so
1198 * does not fit in lun.
1199 */
1200 if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) {
1201 int i;
1202
1203 /*
1204 * Output an error displaying the LUN in byte order,
1205 * this differs from what linux would print for the
1206 * integer LUN value.
1207 */
1208 printk(KERN_WARNING "scsi: %s lun 0x", devname);
1209 data = (char *)lunp->scsi_lun;
1210 for (i = 0; i < sizeof(struct scsi_lun); i++)
1211 printk("%02x", data[i]);
1212 printk(" has a LUN larger than currently supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 } else if (lun > sdev->host->max_lun) {
1214 printk(KERN_WARNING "scsi: %s lun%d has a LUN larger"
1215 " than allowed by the host adapter\n",
1216 devname, lun);
1217 } else {
1218 int res;
1219
1220 res = scsi_probe_and_add_lun(starget,
1221 lun, NULL, NULL, rescan, NULL);
1222 if (res == SCSI_SCAN_NO_RESPONSE) {
1223 /*
1224 * Got some results, but now none, abort.
1225 */
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001226 sdev_printk(KERN_ERR, sdev,
1227 "Unexpected response"
1228 " from lun %d while scanning, scan"
1229 " aborted\n", lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230 break;
1231 }
1232 }
1233 }
1234
Alan Stern2ef89192005-11-08 15:51:55 -05001235 out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 kfree(lun_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237 out:
James Bottomley6f3a2022005-09-22 20:33:28 -05001238 scsi_device_put(sdev);
1239 if (sdev->sdev_state == SDEV_CREATED)
1240 /*
1241 * the sdev we used didn't appear in the report luns scan
1242 */
1243 scsi_destroy_sdev(sdev);
Alan Stern2ef89192005-11-08 15:51:55 -05001244 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245}
1246
1247struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
1248 uint id, uint lun, void *hostdata)
1249{
1250 struct scsi_device *sdev;
1251 struct device *parent = &shost->shost_gendev;
1252 int res;
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001253 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001255 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 if (!starget)
1257 return ERR_PTR(-ENOMEM);
1258
Nathan Lynchc92715b2005-06-02 17:15:09 -05001259 get_device(&starget->dev);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001260 mutex_lock(&shost->scan_mutex);
Mike Anderson82f29462005-06-16 11:14:33 -07001261 if (scsi_host_scan_allowed(shost)) {
1262 res = scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1,
1263 hostdata);
1264 if (res != SCSI_SCAN_LUN_PRESENT)
1265 sdev = ERR_PTR(-ENODEV);
1266 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001267 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268 scsi_target_reap(starget);
1269 put_device(&starget->dev);
1270
1271 return sdev;
1272}
1273EXPORT_SYMBOL(__scsi_add_device);
1274
James Bottomley146f7262005-09-10 12:44:09 -05001275int scsi_add_device(struct Scsi_Host *host, uint channel,
1276 uint target, uint lun)
1277{
1278 struct scsi_device *sdev =
1279 __scsi_add_device(host, channel, target, lun, NULL);
1280 if (IS_ERR(sdev))
1281 return PTR_ERR(sdev);
1282
1283 scsi_device_put(sdev);
1284 return 0;
1285}
1286EXPORT_SYMBOL(scsi_add_device);
1287
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288void scsi_rescan_device(struct device *dev)
1289{
1290 struct scsi_driver *drv;
1291
1292 if (!dev->driver)
1293 return;
1294
1295 drv = to_scsi_driver(dev->driver);
1296 if (try_module_get(drv->owner)) {
1297 if (drv->rescan)
1298 drv->rescan(dev);
1299 module_put(drv->owner);
1300 }
1301}
1302EXPORT_SYMBOL(scsi_rescan_device);
1303
Alan Sterne517d312005-07-26 10:18:45 -04001304static void __scsi_scan_target(struct device *parent, unsigned int channel,
1305 unsigned int id, unsigned int lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306{
1307 struct Scsi_Host *shost = dev_to_shost(parent);
1308 int bflags = 0;
1309 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 struct scsi_target *starget;
1311
1312 if (shost->this_id == id)
1313 /*
1314 * Don't scan the host adapter
1315 */
1316 return;
1317
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 if (!starget)
1320 return;
1321
1322 get_device(&starget->dev);
1323 if (lun != SCAN_WILD_CARD) {
1324 /*
1325 * Scan for a specific host/chan/id/lun.
1326 */
1327 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1328 goto out_reap;
1329 }
1330
1331 /*
1332 * Scan LUN 0, if there is some response, scan further. Ideally, we
1333 * would not configure LUN 0 until all LUNs are scanned.
1334 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001335 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1336 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1337 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 /*
1339 * The REPORT LUN did not scan the target,
1340 * do a sequential scan.
1341 */
1342 scsi_sequential_lun_scan(starget, bflags,
James Bottomley6f3a2022005-09-22 20:33:28 -05001343 res, starget->scsi_level, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345
1346 out_reap:
1347 /* now determine if the target has any children at all
1348 * and if not, nuke it */
1349 scsi_target_reap(starget);
1350
1351 put_device(&starget->dev);
1352}
Alan Sterne517d312005-07-26 10:18:45 -04001353
1354/**
1355 * scsi_scan_target - scan a target id, possibly including all LUNs on the
1356 * target.
1357 * @parent: host to scan
1358 * @channel: channel to scan
1359 * @id: target id to scan
1360 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1361 * @rescan: passed to LUN scanning routines
1362 *
1363 * Description:
1364 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1365 * and possibly all LUNs on the target id.
1366 *
1367 * First try a REPORT LUN scan, if that does not scan the target, do a
1368 * sequential scan of LUNs on the target id.
1369 **/
1370void scsi_scan_target(struct device *parent, unsigned int channel,
1371 unsigned int id, unsigned int lun, int rescan)
1372{
1373 struct Scsi_Host *shost = dev_to_shost(parent);
1374
Arjan van de Ven0b950672006-01-11 13:16:10 +01001375 mutex_lock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001376 if (scsi_host_scan_allowed(shost))
1377 __scsi_scan_target(parent, channel, id, lun, rescan);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001378 mutex_unlock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001379}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380EXPORT_SYMBOL(scsi_scan_target);
1381
1382static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1383 unsigned int id, unsigned int lun, int rescan)
1384{
1385 uint order_id;
1386
1387 if (id == SCAN_WILD_CARD)
1388 for (id = 0; id < shost->max_id; ++id) {
1389 /*
1390 * XXX adapter drivers when possible (FCP, iSCSI)
1391 * could modify max_id to match the current max,
1392 * not the absolute max.
1393 *
1394 * XXX add a shost id iterator, so for example,
1395 * the FC ID can be the same as a target id
1396 * without a huge overhead of sparse id's.
1397 */
1398 if (shost->reverse_ordering)
1399 /*
1400 * Scan from high to low id.
1401 */
1402 order_id = shost->max_id - id - 1;
1403 else
1404 order_id = id;
Alan Sterne517d312005-07-26 10:18:45 -04001405 __scsi_scan_target(&shost->shost_gendev, channel,
1406 order_id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 }
1408 else
Alan Sterne517d312005-07-26 10:18:45 -04001409 __scsi_scan_target(&shost->shost_gendev, channel,
1410 id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411}
1412
1413int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1414 unsigned int id, unsigned int lun, int rescan)
1415{
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001416 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
1417 "%s: <%u:%u:%u>\n",
1418 __FUNCTION__, channel, id, lun));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419
1420 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
1421 ((id != SCAN_WILD_CARD) && (id > shost->max_id)) ||
1422 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1423 return -EINVAL;
1424
Arjan van de Ven0b950672006-01-11 13:16:10 +01001425 mutex_lock(&shost->scan_mutex);
Mike Anderson82f29462005-06-16 11:14:33 -07001426 if (scsi_host_scan_allowed(shost)) {
1427 if (channel == SCAN_WILD_CARD)
1428 for (channel = 0; channel <= shost->max_channel;
1429 channel++)
1430 scsi_scan_channel(shost, channel, id, lun,
1431 rescan);
1432 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 scsi_scan_channel(shost, channel, id, lun, rescan);
Mike Anderson82f29462005-06-16 11:14:33 -07001434 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001435 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436
1437 return 0;
1438}
1439
1440/**
1441 * scsi_scan_host - scan the given adapter
1442 * @shost: adapter to scan
1443 **/
1444void scsi_scan_host(struct Scsi_Host *shost)
1445{
1446 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1447 SCAN_WILD_CARD, 0);
1448}
1449EXPORT_SYMBOL(scsi_scan_host);
1450
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451void scsi_forget_host(struct Scsi_Host *shost)
1452{
Alan Sterna64358d2005-07-26 10:27:10 -04001453 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454 unsigned long flags;
1455
Alan Sterna64358d2005-07-26 10:27:10 -04001456 restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 spin_lock_irqsave(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001458 list_for_each_entry(sdev, &shost->__devices, siblings) {
1459 if (sdev->sdev_state == SDEV_DEL)
1460 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 spin_unlock_irqrestore(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001462 __scsi_remove_device(sdev);
1463 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464 }
1465 spin_unlock_irqrestore(shost->host_lock, flags);
1466}
1467
1468/*
1469 * Function: scsi_get_host_dev()
1470 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001471 * Purpose: Create a scsi_device that points to the host adapter itself.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001473 * Arguments: SHpnt - Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474 *
1475 * Lock status: None assumed.
1476 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001477 * Returns: The scsi_device or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478 *
1479 * Notes:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001480 * Attach a single scsi_device to the Scsi_Host - this should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481 * be made to look like a "pseudo-device" that points to the
1482 * HA itself.
1483 *
1484 * Note - this device is not accessible from any high-level
1485 * drivers (including generics), which is probably not
1486 * optimal. We can add hooks later to attach
1487 */
1488struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1489{
Alan Sterne517d312005-07-26 10:18:45 -04001490 struct scsi_device *sdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491 struct scsi_target *starget;
1492
Arjan van de Ven0b950672006-01-11 13:16:10 +01001493 mutex_lock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001494 if (!scsi_host_scan_allowed(shost))
1495 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1497 if (!starget)
Alan Sterne517d312005-07-26 10:18:45 -04001498 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499
1500 sdev = scsi_alloc_sdev(starget, 0, NULL);
1501 if (sdev) {
1502 sdev->sdev_gendev.parent = get_device(&starget->dev);
1503 sdev->borken = 0;
1504 }
1505 put_device(&starget->dev);
Alan Sterne517d312005-07-26 10:18:45 -04001506 out:
Arjan van de Ven0b950672006-01-11 13:16:10 +01001507 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508 return sdev;
1509}
1510EXPORT_SYMBOL(scsi_get_host_dev);
1511
1512/*
1513 * Function: scsi_free_host_dev()
1514 *
1515 * Purpose: Free a scsi_device that points to the host adapter itself.
1516 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001517 * Arguments: SHpnt - Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518 *
1519 * Lock status: None assumed.
1520 *
1521 * Returns: Nothing
1522 *
1523 * Notes:
1524 */
1525void scsi_free_host_dev(struct scsi_device *sdev)
1526{
1527 BUG_ON(sdev->id != sdev->host->this_id);
1528
James Bottomley6f3a2022005-09-22 20:33:28 -05001529 scsi_destroy_sdev(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530}
1531EXPORT_SYMBOL(scsi_free_host_dev);
1532