blob: fd9e281c3bfeed4fef893cb705e7c8331011c7bd [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
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/module.h>
29#include <linux/moduleparam.h>
30#include <linux/init.h>
31#include <linux/blkdev.h>
32#include <asm/semaphore.h>
33
34#include <scsi/scsi.h>
Christoph Hellwigbeb40482006-06-10 18:01:03 +020035#include <scsi/scsi_cmnd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <scsi/scsi_device.h>
37#include <scsi/scsi_driver.h>
38#include <scsi/scsi_devinfo.h>
39#include <scsi/scsi_host.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <scsi/scsi_transport.h>
41#include <scsi/scsi_eh.h>
42
43#include "scsi_priv.h"
44#include "scsi_logging.h"
45
46#define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
47 " SCSI scanning, some SCSI devices might not be configured\n"
48
49/*
50 * Default timeout
51 */
52#define SCSI_TIMEOUT (2*HZ)
53
54/*
55 * Prefix values for the SCSI id's (stored in driverfs name field)
56 */
57#define SCSI_UID_SER_NUM 'S'
58#define SCSI_UID_UNKNOWN 'Z'
59
60/*
61 * Return values of some of the scanning functions.
62 *
63 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
64 * includes allocation or general failures preventing IO from being sent.
65 *
66 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
67 * on the given LUN.
68 *
69 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
70 * given LUN.
71 */
72#define SCSI_SCAN_NO_RESPONSE 0
73#define SCSI_SCAN_TARGET_PRESENT 1
74#define SCSI_SCAN_LUN_PRESENT 2
75
Arjan van de Ven0ad78202005-11-28 16:22:25 +010076static const char *scsi_null_device_strs = "nullnullnullnull";
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
78#define MAX_SCSI_LUNS 512
79
80#ifdef CONFIG_SCSI_MULTI_LUN
81static unsigned int max_scsi_luns = MAX_SCSI_LUNS;
82#else
83static unsigned int max_scsi_luns = 1;
84#endif
85
86module_param_named(max_luns, max_scsi_luns, int, S_IRUGO|S_IWUSR);
87MODULE_PARM_DESC(max_luns,
88 "last scsi LUN (should be between 1 and 2^32-1)");
89
90/*
91 * max_scsi_report_luns: the maximum number of LUNS that will be
92 * returned from the REPORT LUNS command. 8 times this value must
93 * be allocated. In theory this could be up to an 8 byte value, but
94 * in practice, the maximum number of LUNs suppored by any device
95 * is about 16k.
96 */
97static unsigned int max_scsi_report_luns = 511;
98
99module_param_named(max_report_luns, max_scsi_report_luns, int, S_IRUGO|S_IWUSR);
100MODULE_PARM_DESC(max_report_luns,
101 "REPORT LUNS maximum number of LUNS received (should be"
102 " between 1 and 16384)");
103
104static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+3;
105
106module_param_named(inq_timeout, scsi_inq_timeout, int, S_IRUGO|S_IWUSR);
107MODULE_PARM_DESC(inq_timeout,
108 "Timeout (in seconds) waiting for devices to answer INQUIRY."
109 " Default is 5. Some non-compliant devices need more.");
110
111/**
112 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
James Bottomley39216032005-06-15 18:48:29 -0500113 * @sdev: scsi device to send command to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 * @result: area to store the result of the MODE SENSE
115 *
116 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500117 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 * Called for BLIST_KEY devices.
119 **/
James Bottomley39216032005-06-15 18:48:29 -0500120static void scsi_unlock_floptical(struct scsi_device *sdev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 unsigned char *result)
122{
123 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
124
125 printk(KERN_NOTICE "scsi: unlocking floptical drive\n");
126 scsi_cmd[0] = MODE_SENSE;
127 scsi_cmd[1] = 0;
128 scsi_cmd[2] = 0x2e;
129 scsi_cmd[3] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500130 scsi_cmd[4] = 0x2a; /* size */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 scsi_cmd[5] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500132 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
133 SCSI_TIMEOUT, 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134}
135
136/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 * scsi_alloc_sdev - allocate and setup a scsi_Device
138 *
139 * Description:
140 * Allocate, initialize for io, and return a pointer to a scsi_Device.
141 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
142 * adds scsi_Device to the appropriate list.
143 *
144 * Return value:
145 * scsi_Device pointer, or NULL on failure.
146 **/
147static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
148 unsigned int lun, void *hostdata)
149{
150 struct scsi_device *sdev;
151 int display_failure_msg = 1, ret;
152 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
153
Jes Sorensen24669f752006-01-16 10:31:18 -0500154 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 GFP_ATOMIC);
156 if (!sdev)
157 goto out;
158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 sdev->vendor = scsi_null_device_strs;
160 sdev->model = scsi_null_device_strs;
161 sdev->rev = scsi_null_device_strs;
162 sdev->host = shost;
163 sdev->id = starget->id;
164 sdev->lun = lun;
165 sdev->channel = starget->channel;
166 sdev->sdev_state = SDEV_CREATED;
167 INIT_LIST_HEAD(&sdev->siblings);
168 INIT_LIST_HEAD(&sdev->same_target_siblings);
169 INIT_LIST_HEAD(&sdev->cmd_list);
170 INIT_LIST_HEAD(&sdev->starved_entry);
171 spin_lock_init(&sdev->list_lock);
172
173 sdev->sdev_gendev.parent = get_device(&starget->dev);
174 sdev->sdev_target = starget;
175
176 /* usually NULL and set by ->slave_alloc instead */
177 sdev->hostdata = hostdata;
178
179 /* if the device needs this changing, it may do so in the
180 * slave_configure function */
181 sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
182
183 /*
184 * Some low level driver could use device->type
185 */
186 sdev->type = -1;
187
188 /*
189 * Assume that the device will have handshaking problems,
190 * and then fix this field later if it turns out it
191 * doesn't
192 */
193 sdev->borken = 1;
194
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 sdev->request_queue = scsi_alloc_queue(sdev);
196 if (!sdev->request_queue) {
197 /* release fn is set up in scsi_sysfs_device_initialise, so
198 * have to free and put manually here */
199 put_device(&starget->dev);
Dave Jones93f560892006-03-09 10:21:27 -0500200 kfree(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 goto out;
202 }
203
204 sdev->request_queue->queuedata = sdev;
205 scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
206
207 scsi_sysfs_device_initialize(sdev);
208
209 if (shost->hostt->slave_alloc) {
210 ret = shost->hostt->slave_alloc(sdev);
211 if (ret) {
212 /*
213 * if LLDD reports slave not present, don't clutter
214 * console with alloc failure messages
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 */
216 if (ret == -ENXIO)
217 display_failure_msg = 0;
218 goto out_device_destroy;
219 }
220 }
221
222 return sdev;
223
224out_device_destroy:
225 transport_destroy_device(&sdev->sdev_gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 put_device(&sdev->sdev_gendev);
227out:
228 if (display_failure_msg)
229 printk(ALLOC_FAILURE_MSG, __FUNCTION__);
230 return NULL;
231}
232
233static void scsi_target_dev_release(struct device *dev)
234{
235 struct device *parent = dev->parent;
236 struct scsi_target *starget = to_scsi_target(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500237
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 kfree(starget);
239 put_device(parent);
240}
241
242int scsi_is_target_device(const struct device *dev)
243{
244 return dev->release == scsi_target_dev_release;
245}
246EXPORT_SYMBOL(scsi_is_target_device);
247
248static struct scsi_target *__scsi_find_target(struct device *parent,
249 int channel, uint id)
250{
251 struct scsi_target *starget, *found_starget = NULL;
252 struct Scsi_Host *shost = dev_to_shost(parent);
253 /*
254 * Search for an existing target for this sdev.
255 */
256 list_for_each_entry(starget, &shost->__targets, siblings) {
257 if (starget->id == id &&
258 starget->channel == channel) {
259 found_starget = starget;
260 break;
261 }
262 }
263 if (found_starget)
264 get_device(&found_starget->dev);
265
266 return found_starget;
267}
268
James Bottomley884d25c2006-09-05 16:26:41 -0500269/**
270 * scsi_alloc_target - allocate a new or find an existing target
271 * @parent: parent of the target (need not be a scsi host)
272 * @channel: target channel number (zero if no channels)
273 * @id: target id number
274 *
275 * Return an existing target if one exists, provided it hasn't already
276 * gone into STARGET_DEL state, otherwise allocate a new target.
277 *
278 * The target is returned with an incremented reference, so the caller
279 * is responsible for both reaping and doing a last put
280 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281static struct scsi_target *scsi_alloc_target(struct device *parent,
282 int channel, uint id)
283{
284 struct Scsi_Host *shost = dev_to_shost(parent);
285 struct device *dev = NULL;
286 unsigned long flags;
287 const int size = sizeof(struct scsi_target)
288 + shost->transportt->target_size;
James.Smart@Emulex.Com5c44cd22005-06-10 22:24:30 -0400289 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 struct scsi_target *found_target;
Brian King32f95792006-02-22 14:28:24 -0600291 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
Jes Sorensen24669f752006-01-16 10:31:18 -0500293 starget = kzalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 if (!starget) {
295 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
296 return NULL;
297 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 dev = &starget->dev;
299 device_initialize(dev);
300 starget->reap_ref = 1;
301 dev->parent = get_device(parent);
302 dev->release = scsi_target_dev_release;
303 sprintf(dev->bus_id, "target%d:%d:%d",
304 shost->host_no, channel, id);
305 starget->id = id;
306 starget->channel = channel;
307 INIT_LIST_HEAD(&starget->siblings);
308 INIT_LIST_HEAD(&starget->devices);
James Bottomleyffedb452006-02-23 14:27:18 -0600309 starget->state = STARGET_RUNNING;
310 retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 spin_lock_irqsave(shost->host_lock, flags);
312
313 found_target = __scsi_find_target(parent, channel, id);
314 if (found_target)
315 goto found;
316
317 list_add_tail(&starget->siblings, &shost->__targets);
318 spin_unlock_irqrestore(shost->host_lock, flags);
319 /* allocate and add */
James Bottomleya283bd32005-05-24 12:06:38 -0500320 transport_setup_device(dev);
Brian King32f95792006-02-22 14:28:24 -0600321 error = device_add(dev);
322 if (error) {
323 dev_err(dev, "target device_add failed, error %d\n", error);
324 spin_lock_irqsave(shost->host_lock, flags);
325 list_del_init(&starget->siblings);
326 spin_unlock_irqrestore(shost->host_lock, flags);
327 transport_destroy_device(dev);
328 put_device(parent);
329 kfree(starget);
330 return NULL;
331 }
James Bottomleya283bd32005-05-24 12:06:38 -0500332 transport_add_device(dev);
333 if (shost->hostt->target_alloc) {
Brian King32f95792006-02-22 14:28:24 -0600334 error = shost->hostt->target_alloc(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500335
336 if(error) {
337 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
338 /* don't want scsi_target_reap to do the final
339 * put because it will be under the host lock */
340 get_device(dev);
341 scsi_target_reap(starget);
342 put_device(dev);
343 return NULL;
344 }
345 }
James Bottomley884d25c2006-09-05 16:26:41 -0500346 get_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500347
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 return starget;
349
350 found:
351 found_target->reap_ref++;
352 spin_unlock_irqrestore(shost->host_lock, flags);
James Bottomleyffedb452006-02-23 14:27:18 -0600353 if (found_target->state != STARGET_DEL) {
James Bottomley884d25c2006-09-05 16:26:41 -0500354 put_device(parent);
James Bottomleyffedb452006-02-23 14:27:18 -0600355 kfree(starget);
356 return found_target;
357 }
358 /* Unfortunately, we found a dying target; need to
359 * wait until it's dead before we can get a new one */
360 put_device(&found_target->dev);
361 flush_scheduled_work();
362 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363}
364
James Bottomley65110b22006-02-14 10:48:46 -0600365static void scsi_target_reap_usercontext(void *data)
366{
367 struct scsi_target *starget = data;
James Bottomley863a9302005-12-15 20:01:43 -0800368 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
369 unsigned long flags;
370
James Bottomleyffedb452006-02-23 14:27:18 -0600371 transport_remove_device(&starget->dev);
372 device_del(&starget->dev);
373 transport_destroy_device(&starget->dev);
James Bottomley863a9302005-12-15 20:01:43 -0800374 spin_lock_irqsave(shost->host_lock, flags);
Mike Andersona50a5e32006-03-14 11:18:46 -0800375 if (shost->hostt->target_destroy)
376 shost->hostt->target_destroy(starget);
James Bottomleyffedb452006-02-23 14:27:18 -0600377 list_del_init(&starget->siblings);
James Bottomley863a9302005-12-15 20:01:43 -0800378 spin_unlock_irqrestore(shost->host_lock, flags);
James Bottomleyffedb452006-02-23 14:27:18 -0600379 put_device(&starget->dev);
James Bottomley863a9302005-12-15 20:01:43 -0800380}
381
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382/**
383 * scsi_target_reap - check to see if target is in use and destroy if not
384 *
385 * @starget: target to be checked
386 *
387 * This is used after removing a LUN or doing a last put of the target
388 * it checks atomically that nothing is using the target and removes
389 * it if so.
390 */
391void scsi_target_reap(struct scsi_target *starget)
392{
James Bottomleyffedb452006-02-23 14:27:18 -0600393 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
394 unsigned long flags;
395
396 spin_lock_irqsave(shost->host_lock, flags);
397
398 if (--starget->reap_ref == 0 && list_empty(&starget->devices)) {
399 BUG_ON(starget->state == STARGET_DEL);
400 starget->state = STARGET_DEL;
401 spin_unlock_irqrestore(shost->host_lock, flags);
402 execute_in_process_context(scsi_target_reap_usercontext,
403 starget, &starget->ew);
404 return;
405
406 }
407 spin_unlock_irqrestore(shost->host_lock, flags);
408
409 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410}
411
412/**
Alan Sterne5b3cd42006-08-21 15:53:25 -0400413 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
414 * @s: INQUIRY result string to sanitize
415 * @len: length of the string
416 *
417 * Description:
418 * The SCSI spec says that INQUIRY vendor, product, and revision
419 * strings must consist entirely of graphic ASCII characters,
420 * padded on the right with spaces. Since not all devices obey
421 * this rule, we will replace non-graphic or non-ASCII characters
422 * with spaces. Exception: a NUL character is interpreted as a
423 * string terminator, so all the following characters are set to
424 * spaces.
425 **/
426static void sanitize_inquiry_string(unsigned char *s, int len)
427{
428 int terminated = 0;
429
430 for (; len > 0; (--len, ++s)) {
431 if (*s == 0)
432 terminated = 1;
433 if (terminated || *s < 0x20 || *s > 0x7e)
434 *s = ' ';
435 }
436}
437
438/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
James Bottomley39216032005-06-15 18:48:29 -0500440 * @sdev: scsi_device to probe
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 * @inq_result: area to store the INQUIRY result
James Bottomley39216032005-06-15 18:48:29 -0500442 * @result_len: len of inq_result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 * @bflags: store any bflags found here
444 *
445 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500446 * Probe the lun associated with @req using a standard SCSI INQUIRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 *
James Bottomley39216032005-06-15 18:48:29 -0500448 * If the INQUIRY is successful, zero is returned and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100450 * are copied to the scsi_device any flags value is stored in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400452static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
James Bottomley39216032005-06-15 18:48:29 -0500453 int result_len, int *bflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
456 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
457 int response_len = 0;
James Bottomley39216032005-06-15 18:48:29 -0500458 int pass, count, result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 struct scsi_sense_hdr sshdr;
460
461 *bflags = 0;
462
463 /* Perform up to 3 passes. The first pass uses a conservative
464 * transfer length of 36 unless sdev->inquiry_len specifies a
465 * different value. */
466 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
467 try_inquiry_len = first_inquiry_len;
468 pass = 1;
469
470 next_pass:
James Bottomley9ccfc752005-10-02 11:45:08 -0500471 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
472 "scsi scan: INQUIRY pass %d length %d\n",
473 pass, try_inquiry_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
475 /* Each pass gets up to three chances to ignore Unit Attention */
476 for (count = 0; count < 3; ++count) {
477 memset(scsi_cmd, 0, 6);
478 scsi_cmd[0] = INQUIRY;
479 scsi_cmd[4] = (unsigned char) try_inquiry_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
481 memset(inq_result, 0, try_inquiry_len);
James Bottomley39216032005-06-15 18:48:29 -0500482
483 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -0500484 inq_result, try_inquiry_len, &sshdr,
James Bottomley39216032005-06-15 18:48:29 -0500485 HZ / 2 + HZ * scsi_inq_timeout, 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
487 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
488 "with code 0x%x\n",
James Bottomley39216032005-06-15 18:48:29 -0500489 result ? "failed" : "successful", result));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
James Bottomley39216032005-06-15 18:48:29 -0500491 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 /*
493 * not-ready to ready transition [asc/ascq=0x28/0x0]
494 * or power-on, reset [asc/ascq=0x29/0x0], continue.
495 * INQUIRY should not yield UNIT_ATTENTION
496 * but many buggy devices do so anyway.
497 */
James Bottomley39216032005-06-15 18:48:29 -0500498 if ((driver_byte(result) & DRIVER_SENSE) &&
James Bottomleyea73a9f2005-08-28 11:33:52 -0500499 scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 if ((sshdr.sense_key == UNIT_ATTENTION) &&
501 ((sshdr.asc == 0x28) ||
502 (sshdr.asc == 0x29)) &&
503 (sshdr.ascq == 0))
504 continue;
505 }
506 }
507 break;
508 }
509
James Bottomley39216032005-06-15 18:48:29 -0500510 if (result == 0) {
Alan Sterne5b3cd42006-08-21 15:53:25 -0400511 sanitize_inquiry_string(&inq_result[8], 8);
512 sanitize_inquiry_string(&inq_result[16], 16);
513 sanitize_inquiry_string(&inq_result[32], 4);
514
515 response_len = inq_result[4] + 5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 if (response_len > 255)
517 response_len = first_inquiry_len; /* sanity */
518
519 /*
520 * Get any flags for this device.
521 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100522 * XXX add a bflags to scsi_device, and replace the
523 * corresponding bit fields in scsi_device, so bflags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 * need not be passed as an argument.
525 */
526 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
527 &inq_result[16]);
528
529 /* When the first pass succeeds we gain information about
530 * what larger transfer lengths might work. */
531 if (pass == 1) {
532 if (BLIST_INQUIRY_36 & *bflags)
533 next_inquiry_len = 36;
534 else if (BLIST_INQUIRY_58 & *bflags)
535 next_inquiry_len = 58;
536 else if (sdev->inquiry_len)
537 next_inquiry_len = sdev->inquiry_len;
538 else
539 next_inquiry_len = response_len;
540
541 /* If more data is available perform the second pass */
542 if (next_inquiry_len > try_inquiry_len) {
543 try_inquiry_len = next_inquiry_len;
544 pass = 2;
545 goto next_pass;
546 }
547 }
548
549 } else if (pass == 2) {
550 printk(KERN_INFO "scsi scan: %d byte inquiry failed. "
551 "Consider BLIST_INQUIRY_36 for this device\n",
552 try_inquiry_len);
553
554 /* If this pass failed, the third pass goes back and transfers
555 * the same amount as we successfully got in the first pass. */
556 try_inquiry_len = first_inquiry_len;
557 pass = 3;
558 goto next_pass;
559 }
560
561 /* If the last transfer attempt got an error, assume the
562 * peripheral doesn't exist or is dead. */
James Bottomley39216032005-06-15 18:48:29 -0500563 if (result)
564 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
566 /* Don't report any more data than the device says is valid */
567 sdev->inquiry_len = min(try_inquiry_len, response_len);
568
569 /*
570 * XXX Abort if the response length is less than 36? If less than
571 * 32, the lookup of the device flags (above) could be invalid,
572 * and it would be possible to take an incorrect action - we do
573 * not want to hang because of a short INQUIRY. On the flip side,
574 * if the device is spun down or becoming ready (and so it gives a
575 * short INQUIRY), an abort here prevents any further use of the
576 * device, including spin up.
577 *
578 * Related to the above issue:
579 *
580 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
581 * and if not ready, sent a START_STOP to start (maybe spin up) and
582 * then send the INQUIRY again, since the INQUIRY can change after
583 * a device is initialized.
584 *
585 * Ideally, start a device if explicitly asked to do so. This
586 * assumes that a device is spun up on power on, spun down on
587 * request, and then spun up on request.
588 */
589
590 /*
591 * The scanning code needs to know the scsi_level, even if no
592 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
593 * non-zero LUNs can be scanned.
594 */
595 sdev->scsi_level = inq_result[2] & 0x07;
596 if (sdev->scsi_level >= 2 ||
597 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
598 sdev->scsi_level++;
James Bottomley6f3a2022005-09-22 20:33:28 -0500599 sdev->sdev_target->scsi_level = sdev->scsi_level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600
James Bottomley39216032005-06-15 18:48:29 -0500601 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602}
603
604/**
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100605 * scsi_add_lun - allocate and fully initialze a scsi_device
606 * @sdevscan: holds information to be stored in the new scsi_device
607 * @sdevnew: store the address of the newly allocated scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 * @inq_result: holds the result of a previous INQUIRY to the LUN
609 * @bflags: black/white list flag
610 *
611 * Description:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100612 * Allocate and initialize a scsi_device matching sdevscan. Optionally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 * set fields based on values in *@bflags. If @sdevnew is not
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100614 * NULL, store the address of the new scsi_device in *@sdevnew (needed
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 * when scanning a particular LUN).
616 *
617 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100618 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
619 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400621static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
622 int *bflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623{
624 /*
625 * XXX do not save the inquiry, since it can change underneath us,
626 * save just vendor/model/rev.
627 *
628 * Rather than save it and have an ioctl that retrieves the saved
629 * value, have an ioctl that executes the same INQUIRY code used
630 * in scsi_probe_lun, let user level programs doing INQUIRY
631 * scanning run at their own risk, or supply a user level program
632 * that can correctly scan.
633 */
634 sdev->inquiry = kmalloc(sdev->inquiry_len, GFP_ATOMIC);
635 if (sdev->inquiry == NULL) {
636 return SCSI_SCAN_NO_RESPONSE;
637 }
638
639 memcpy(sdev->inquiry, inq_result, sdev->inquiry_len);
640 sdev->vendor = (char *) (sdev->inquiry + 8);
641 sdev->model = (char *) (sdev->inquiry + 16);
642 sdev->rev = (char *) (sdev->inquiry + 32);
643
644 if (*bflags & BLIST_ISROM) {
645 /*
646 * It would be better to modify sdev->type, and set
Matthew Wilcox4ff36712006-07-04 12:15:20 -0600647 * sdev->removable; this can now be done since
648 * print_inquiry has gone away.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 */
650 inq_result[0] = TYPE_ROM;
651 inq_result[1] |= 0x80; /* removable */
652 } else if (*bflags & BLIST_NO_ULD_ATTACH)
653 sdev->no_uld_attach = 1;
654
655 switch (sdev->type = (inq_result[0] & 0x1f)) {
656 case TYPE_TAPE:
657 case TYPE_DISK:
658 case TYPE_PRINTER:
659 case TYPE_MOD:
660 case TYPE_PROCESSOR:
661 case TYPE_SCANNER:
662 case TYPE_MEDIUM_CHANGER:
663 case TYPE_ENCLOSURE:
664 case TYPE_COMM:
James Bottomley4d7db042006-03-31 20:07:45 -0600665 case TYPE_RAID:
Al Viro 631e8a12005-05-16 01:59:55 +0100666 case TYPE_RBC:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 sdev->writeable = 1;
668 break;
669 case TYPE_WORM:
670 case TYPE_ROM:
671 sdev->writeable = 0;
672 break;
673 default:
674 printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type);
675 }
676
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 /*
678 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
679 * spec says: The device server is capable of supporting the
680 * specified peripheral device type on this logical unit. However,
681 * the physical device is not currently connected to this logical
682 * unit.
683 *
684 * The above is vague, as it implies that we could treat 001 and
685 * 011 the same. Stay compatible with previous code, and create a
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100686 * scsi_device for a PQ of 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 *
688 * Don't set the device offline here; rather let the upper
689 * level drivers eval the PQ to decide whether they should
690 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
691 */
692
693 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
694 sdev->removable = (0x80 & inq_result[1]) >> 7;
695 sdev->lockable = sdev->removable;
696 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
697
698 if (sdev->scsi_level >= SCSI_3 || (sdev->inquiry_len > 56 &&
699 inq_result[56] & 0x04))
700 sdev->ppr = 1;
701 if (inq_result[7] & 0x60)
702 sdev->wdtr = 1;
703 if (inq_result[7] & 0x10)
704 sdev->sdtr = 1;
705
James Bottomley19ac0db2006-08-06 18:15:22 -0500706 sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d "
Matthew Wilcox4ff36712006-07-04 12:15:20 -0600707 "ANSI: %d%s\n", scsi_device_type(sdev->type),
708 sdev->vendor, sdev->model, sdev->rev,
709 sdev->inq_periph_qual, inq_result[2] & 0x07,
710 (inq_result[3] & 0x0f) == 1 ? " CCS" : "");
711
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 /*
Greg KH5e3c34c2006-01-18 16:17:46 -0800713 * End sysfs code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 */
715
716 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
717 !(*bflags & BLIST_NOTQ))
718 sdev->tagged_supported = 1;
719 /*
720 * Some devices (Texel CD ROM drives) have handshaking problems
721 * when used with the Seagate controllers. borken is initialized
722 * to 1, and then set it to 0 here.
723 */
724 if ((*bflags & BLIST_BORKEN) == 0)
725 sdev->borken = 0;
726
727 /*
728 * Apparently some really broken devices (contrary to the SCSI
729 * standards) need to be selected without asserting ATN
730 */
731 if (*bflags & BLIST_SELECT_NO_ATN)
732 sdev->select_no_atn = 1;
733
734 /*
James Bottomley4d7db042006-03-31 20:07:45 -0600735 * Maximum 512 sector transfer length
736 * broken RA4x00 Compaq Disk Array
737 */
738 if (*bflags & BLIST_MAX_512)
739 blk_queue_max_sectors(sdev->request_queue, 512);
740
741 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 * Some devices may not want to have a start command automatically
743 * issued when a device is added.
744 */
745 if (*bflags & BLIST_NOSTARTONADD)
746 sdev->no_start_on_add = 1;
747
748 if (*bflags & BLIST_SINGLELUN)
749 sdev->single_lun = 1;
750
751
752 sdev->use_10_for_rw = 1;
753
754 if (*bflags & BLIST_MS_SKIP_PAGE_08)
755 sdev->skip_ms_page_8 = 1;
756
757 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
758 sdev->skip_ms_page_3f = 1;
759
760 if (*bflags & BLIST_USE_10_BYTE_MS)
761 sdev->use_10_for_ms = 1;
762
763 /* set the device running here so that slave configure
764 * may do I/O */
765 scsi_device_set_state(sdev, SDEV_RUNNING);
766
767 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
768 sdev->use_192_bytes_for_3f = 1;
769
770 if (*bflags & BLIST_NOT_LOCKABLE)
771 sdev->lockable = 0;
772
773 if (*bflags & BLIST_RETRY_HWERROR)
774 sdev->retry_hwerror = 1;
775
776 transport_configure_device(&sdev->sdev_gendev);
777
Christoph Hellwig93805092006-02-17 12:11:29 +0100778 if (sdev->host->hostt->slave_configure) {
779 int ret = sdev->host->hostt->slave_configure(sdev);
780 if (ret) {
781 /*
782 * if LLDD reports slave not present, don't clutter
783 * console with alloc failure messages
784 */
785 if (ret != -ENXIO) {
786 sdev_printk(KERN_ERR, sdev,
787 "failed to configure device\n");
788 }
789 return SCSI_SCAN_NO_RESPONSE;
790 }
791 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792
793 /*
794 * Ok, the device is now all set up, we can
795 * register it and tell the rest of the kernel
796 * about it.
797 */
Alan Sternb24b1032005-07-27 11:43:46 -0700798 if (scsi_sysfs_add_sdev(sdev) != 0)
799 return SCSI_SCAN_NO_RESPONSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
801 return SCSI_SCAN_LUN_PRESENT;
802}
803
James Bottomley6f3a2022005-09-22 20:33:28 -0500804static inline void scsi_destroy_sdev(struct scsi_device *sdev)
805{
Brian King309bd272006-06-27 11:10:43 -0500806 scsi_device_set_state(sdev, SDEV_DEL);
James Bottomley6f3a2022005-09-22 20:33:28 -0500807 if (sdev->host->hostt->slave_destroy)
808 sdev->host->hostt->slave_destroy(sdev);
809 transport_destroy_device(&sdev->sdev_gendev);
810 put_device(&sdev->sdev_gendev);
811}
812
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700813#ifdef CONFIG_SCSI_LOGGING
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200814/**
815 * scsi_inq_str - print INQUIRY data from min to max index,
816 * strip trailing whitespace
817 * @buf: Output buffer with at least end-first+1 bytes of space
818 * @inq: Inquiry buffer (input)
819 * @first: Offset of string into inq
820 * @end: Index after last character in inq
821 */
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700822static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200823 unsigned first, unsigned end)
824{
825 unsigned term = 0, idx;
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700826
827 for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
828 if (inq[idx+first] > ' ') {
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200829 buf[idx] = inq[idx+first];
830 term = idx+1;
831 } else {
832 buf[idx] = ' ';
833 }
834 }
835 buf[term] = 0;
836 return buf;
837}
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700838#endif
James Bottomley6f3a2022005-09-22 20:33:28 -0500839
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840/**
841 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
842 * @starget: pointer to target device structure
843 * @lun: LUN of target device
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100844 * @sdevscan: probe the LUN corresponding to this scsi_device
845 * @sdevnew: store the value of any new scsi_device allocated
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 * @bflagsp: store bflags here if not NULL
847 *
848 * Description:
849 * Call scsi_probe_lun, if a LUN with an attached device is found,
850 * allocate and set it up by calling scsi_add_lun.
851 *
852 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100853 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
855 * attached at the LUN
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100856 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 **/
858static int scsi_probe_and_add_lun(struct scsi_target *starget,
859 uint lun, int *bflagsp,
860 struct scsi_device **sdevp, int rescan,
861 void *hostdata)
862{
863 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 unsigned char *result;
James Bottomley39216032005-06-15 18:48:29 -0500865 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
867
868 /*
869 * The rescan flag is used as an optimization, the first scan of a
870 * host adapter calls into here with rescan == 0.
871 */
James Bottomley6f3a2022005-09-22 20:33:28 -0500872 sdev = scsi_device_lookup_by_target(starget, lun);
873 if (sdev) {
874 if (rescan || sdev->sdev_state != SDEV_CREATED) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
876 "scsi scan: device exists on %s\n",
877 sdev->sdev_gendev.bus_id));
878 if (sdevp)
879 *sdevp = sdev;
880 else
881 scsi_device_put(sdev);
882
883 if (bflagsp)
884 *bflagsp = scsi_get_device_flags(sdev,
885 sdev->vendor,
886 sdev->model);
887 return SCSI_SCAN_LUN_PRESENT;
888 }
James Bottomley6f3a2022005-09-22 20:33:28 -0500889 scsi_device_put(sdev);
890 } else
891 sdev = scsi_alloc_sdev(starget, lun, hostdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 if (!sdev)
893 goto out;
James Bottomley39216032005-06-15 18:48:29 -0500894
895 result = kmalloc(result_len, GFP_ATOMIC |
Al Virobc861202005-04-24 12:28:34 -0700896 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 if (!result)
James Bottomley39216032005-06-15 18:48:29 -0500898 goto out_free_sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899
James Bottomley39216032005-06-15 18:48:29 -0500900 if (scsi_probe_lun(sdev, result, result_len, &bflags))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 goto out_free_result;
902
Kurt Garloff4186ab12006-04-03 15:16:48 +0200903 if (bflagsp)
904 *bflagsp = bflags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 /*
906 * result contains valid SCSI INQUIRY data.
907 */
Kurt Garloff13f7e5a2006-04-03 15:20:08 +0200908 if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 /*
910 * For a Peripheral qualifier 3 (011b), the SCSI
911 * spec says: The device server is not capable of
912 * supporting a physical device on this logical
913 * unit.
914 *
915 * For disks, this implies that there is no
916 * logical disk configured at sdev->lun, but there
917 * is a target id responding.
918 */
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200919 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
920 " peripheral qualifier of 3, device not"
921 " added\n"))
922 if (lun == 0) {
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700923 SCSI_LOG_SCAN_BUS(1, {
924 unsigned char vend[9];
925 unsigned char mod[17];
926
927 sdev_printk(KERN_INFO, sdev,
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200928 "scsi scan: consider passing scsi_mod."
929 "dev_flags=%s:%s:0x240 or 0x800240\n",
930 scsi_inq_str(vend, result, 8, 16),
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700931 scsi_inq_str(mod, result, 16, 32));
932 });
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200933 }
934
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 res = SCSI_SCAN_TARGET_PRESENT;
936 goto out_free_result;
937 }
938
Alan Stern1bfc5d92006-02-09 15:26:18 -0500939 /*
dave wysochanski84961f22006-08-09 14:56:32 -0400940 * Some targets may set slight variations of PQ and PDT to signal
941 * that no LUN is present, so don't add sdev in these cases.
942 * Two specific examples are:
943 * 1) NetApp targets: return PQ=1, PDT=0x1f
944 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
945 * in the UFI 1.0 spec (we cannot rely on reserved bits).
946 *
947 * References:
948 * 1) SCSI SPC-3, pp. 145-146
949 * PQ=1: "A peripheral device having the specified peripheral
950 * device type is not connected to this logical unit. However, the
951 * device server is capable of supporting the specified peripheral
952 * device type on this logical unit."
953 * PDT=0x1f: "Unknown or no device type"
954 * 2) USB UFI 1.0, p. 20
955 * PDT=00h Direct-access device (floppy)
956 * PDT=1Fh none (no FDD connected to the requested logical unit)
Alan Stern1bfc5d92006-02-09 15:26:18 -0500957 */
dave wysochanski84961f22006-08-09 14:56:32 -0400958 if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) &&
959 (result[0] & 0x1f) == 0x1f) {
Alan Stern1bfc5d92006-02-09 15:26:18 -0500960 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
961 "scsi scan: peripheral device type"
962 " of 31, no device added\n"));
963 res = SCSI_SCAN_TARGET_PRESENT;
964 goto out_free_result;
965 }
966
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 res = scsi_add_lun(sdev, result, &bflags);
968 if (res == SCSI_SCAN_LUN_PRESENT) {
969 if (bflags & BLIST_KEY) {
970 sdev->lockable = 0;
James Bottomley39216032005-06-15 18:48:29 -0500971 scsi_unlock_floptical(sdev, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 }
974
975 out_free_result:
976 kfree(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 out_free_sdev:
978 if (res == SCSI_SCAN_LUN_PRESENT) {
979 if (sdevp) {
Alan Sternb70d37b2005-07-26 10:30:40 -0400980 if (scsi_device_get(sdev) == 0) {
981 *sdevp = sdev;
982 } else {
983 __scsi_remove_device(sdev);
984 res = SCSI_SCAN_NO_RESPONSE;
985 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 }
James Bottomley6f3a2022005-09-22 20:33:28 -0500987 } else
988 scsi_destroy_sdev(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 out:
990 return res;
991}
992
993/**
994 * scsi_sequential_lun_scan - sequentially scan a SCSI target
995 * @starget: pointer to target structure to scan
996 * @bflags: black/white list flag for LUN 0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 *
998 * Description:
999 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1000 * scanned) to some maximum lun until a LUN is found with no device
1001 * attached. Use the bflags to figure out any oddities.
1002 *
1003 * Modifies sdevscan->lun.
1004 **/
1005static void scsi_sequential_lun_scan(struct scsi_target *starget,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001006 int bflags, int scsi_level, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007{
1008 unsigned int sparse_lun, lun, max_dev_lun;
1009 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1010
1011 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of"
1012 "%s\n", starget->dev.bus_id));
1013
1014 max_dev_lun = min(max_scsi_luns, shost->max_lun);
1015 /*
1016 * If this device is known to support sparse multiple units,
1017 * override the other settings, and scan all of them. Normally,
1018 * SCSI-3 devices should be scanned via the REPORT LUNS.
1019 */
1020 if (bflags & BLIST_SPARSELUN) {
1021 max_dev_lun = shost->max_lun;
1022 sparse_lun = 1;
1023 } else
1024 sparse_lun = 0;
1025
1026 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 * If less than SCSI_1_CSS, and no special lun scaning, stop
1028 * scanning; this matches 2.4 behaviour, but could just be a bug
1029 * (to continue scanning a SCSI_1_CSS device).
1030 *
1031 * This test is broken. We might not have any device on lun0 for
1032 * a sparselun device, and if that's the case then how would we
1033 * know the real scsi_level, eh? It might make sense to just not
1034 * scan any SCSI_1 device for non-0 luns, but that check would best
1035 * go into scsi_alloc_sdev() and just have it return null when asked
1036 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1037 *
1038 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1039 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1040 == 0))
1041 return;
1042 */
1043 /*
1044 * If this device is known to support multiple units, override
1045 * the other settings, and scan all of them.
1046 */
1047 if (bflags & BLIST_FORCELUN)
1048 max_dev_lun = shost->max_lun;
1049 /*
1050 * REGAL CDC-4X: avoid hang after LUN 4
1051 */
1052 if (bflags & BLIST_MAX5LUN)
1053 max_dev_lun = min(5U, max_dev_lun);
1054 /*
1055 * Do not scan SCSI-2 or lower device past LUN 7, unless
1056 * BLIST_LARGELUN.
1057 */
1058 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
1059 max_dev_lun = min(8U, max_dev_lun);
1060
1061 /*
1062 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1063 * until we reach the max, or no LUN is found and we are not
1064 * sparse_lun.
1065 */
1066 for (lun = 1; lun < max_dev_lun; ++lun)
1067 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
1068 NULL) != SCSI_SCAN_LUN_PRESENT) &&
1069 !sparse_lun)
1070 return;
1071}
1072
1073/**
1074 * scsilun_to_int: convert a scsi_lun to an int
1075 * @scsilun: struct scsi_lun to be converted.
1076 *
1077 * Description:
1078 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1079 * integer, and return the result. The caller must check for
1080 * truncation before using this function.
1081 *
1082 * Notes:
1083 * The struct scsi_lun is assumed to be four levels, with each level
1084 * effectively containing a SCSI byte-ordered (big endian) short; the
1085 * addressing bits of each level are ignored (the highest two bits).
1086 * For a description of the LUN format, post SCSI-3 see the SCSI
1087 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1088 *
1089 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1090 * the integer: 0x0b030a04
1091 **/
1092static int scsilun_to_int(struct scsi_lun *scsilun)
1093{
1094 int i;
1095 unsigned int lun;
1096
1097 lun = 0;
1098 for (i = 0; i < sizeof(lun); i += 2)
1099 lun = lun | (((scsilun->scsi_lun[i] << 8) |
1100 scsilun->scsi_lun[i + 1]) << (i * 8));
1101 return lun;
1102}
1103
1104/**
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001105 * int_to_scsilun: reverts an int into a scsi_lun
1106 * @int: integer to be reverted
1107 * @scsilun: struct scsi_lun to be set.
1108 *
1109 * Description:
1110 * Reverts the functionality of the scsilun_to_int, which packed
1111 * an 8-byte lun value into an int. This routine unpacks the int
1112 * back into the lun value.
1113 * Note: the scsilun_to_int() routine does not truly handle all
1114 * 8bytes of the lun value. This functions restores only as much
1115 * as was set by the routine.
1116 *
1117 * Notes:
1118 * Given an integer : 0x0b030a04, this function returns a
1119 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1120 *
1121 **/
1122void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun)
1123{
1124 int i;
1125
1126 memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
1127
1128 for (i = 0; i < sizeof(lun); i += 2) {
1129 scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
1130 scsilun->scsi_lun[i+1] = lun & 0xFF;
1131 lun = lun >> 16;
1132 }
1133}
1134EXPORT_SYMBOL(int_to_scsilun);
1135
1136/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001138 * @sdevscan: scan the host, channel, and id of this scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 *
1140 * Description:
1141 * If @sdevscan is for a SCSI-3 or up device, send a REPORT LUN
1142 * command, and scan the resulting list of LUNs by calling
1143 * scsi_probe_and_add_lun.
1144 *
1145 * Modifies sdevscan->lun.
1146 *
1147 * Return:
1148 * 0: scan completed (or no memory, so further scanning is futile)
1149 * 1: no report lun scan, or not configured
1150 **/
James Bottomley6f3a2022005-09-22 20:33:28 -05001151static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 int rescan)
1153{
1154 char devname[64];
1155 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1156 unsigned int length;
1157 unsigned int lun;
1158 unsigned int num_luns;
1159 unsigned int retries;
James Bottomley39216032005-06-15 18:48:29 -05001160 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 struct scsi_lun *lunp, *lun_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 u8 *data;
1163 struct scsi_sense_hdr sshdr;
James Bottomley6f3a2022005-09-22 20:33:28 -05001164 struct scsi_device *sdev;
1165 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
Alan Stern2ef89192005-11-08 15:51:55 -05001166 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167
1168 /*
1169 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1170 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1171 * support more than 8 LUNs.
1172 */
James Bottomley4d7db042006-03-31 20:07:45 -06001173 if (bflags & BLIST_NOREPORTLUN)
1174 return 1;
1175 if (starget->scsi_level < SCSI_2 &&
1176 starget->scsi_level != SCSI_UNKNOWN)
1177 return 1;
1178 if (starget->scsi_level < SCSI_3 &&
1179 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180 return 1;
1181 if (bflags & BLIST_NOLUN)
1182 return 0;
1183
James Bottomley6f3a2022005-09-22 20:33:28 -05001184 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1185 sdev = scsi_alloc_sdev(starget, 0, NULL);
1186 if (!sdev)
1187 return 0;
1188 if (scsi_device_get(sdev))
1189 return 0;
1190 }
1191
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 sprintf(devname, "host %d channel %d id %d",
James Bottomley6f3a2022005-09-22 20:33:28 -05001193 shost->host_no, sdev->channel, sdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194
1195 /*
1196 * Allocate enough to hold the header (the same size as one scsi_lun)
1197 * plus the max number of luns we are requesting.
1198 *
1199 * Reallocating and trying again (with the exact amount we need)
1200 * would be nice, but then we need to somehow limit the size
1201 * allocated based on the available memory and the limits of
1202 * kmalloc - we don't want a kmalloc() failure of a huge value to
1203 * prevent us from finding any LUNs on this target.
1204 */
1205 length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun);
1206 lun_data = kmalloc(length, GFP_ATOMIC |
1207 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
James Bottomley6f3a2022005-09-22 20:33:28 -05001208 if (!lun_data) {
1209 printk(ALLOC_FAILURE_MSG, __FUNCTION__);
James Bottomley39216032005-06-15 18:48:29 -05001210 goto out;
James Bottomley6f3a2022005-09-22 20:33:28 -05001211 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212
1213 scsi_cmd[0] = REPORT_LUNS;
1214
1215 /*
1216 * bytes 1 - 5: reserved, set to zero.
1217 */
1218 memset(&scsi_cmd[1], 0, 5);
1219
1220 /*
1221 * bytes 6 - 9: length of the command.
1222 */
1223 scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff;
1224 scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff;
1225 scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff;
1226 scsi_cmd[9] = (unsigned char) length & 0xff;
1227
1228 scsi_cmd[10] = 0; /* reserved */
1229 scsi_cmd[11] = 0; /* control */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230
1231 /*
1232 * We can get a UNIT ATTENTION, for example a power on/reset, so
1233 * retry a few times (like sd.c does for TEST UNIT READY).
1234 * Experience shows some combinations of adapter/devices get at
1235 * least two power on/resets.
1236 *
1237 * Illegal requests (for devices that do not support REPORT LUNS)
1238 * should come through as a check condition, and will not generate
1239 * a retry.
1240 */
1241 for (retries = 0; retries < 3; retries++) {
1242 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending"
1243 " REPORT LUNS to %s (try %d)\n", devname,
1244 retries));
James Bottomley39216032005-06-15 18:48:29 -05001245
James Bottomley39216032005-06-15 18:48:29 -05001246 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001247 lun_data, length, &sshdr,
James Bottomley39216032005-06-15 18:48:29 -05001248 SCSI_TIMEOUT + 4 * HZ, 3);
1249
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS"
James Bottomley39216032005-06-15 18:48:29 -05001251 " %s (try %d) result 0x%x\n", result
1252 ? "failed" : "successful", retries, result));
1253 if (result == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254 break;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001255 else if (scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 if (sshdr.sense_key != UNIT_ATTENTION)
1257 break;
1258 }
1259 }
1260
James Bottomley39216032005-06-15 18:48:29 -05001261 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 /*
1263 * The device probably does not support a REPORT LUN command
1264 */
Alan Stern2ef89192005-11-08 15:51:55 -05001265 ret = 1;
1266 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268
1269 /*
1270 * Get the length from the first four bytes of lun_data.
1271 */
1272 data = (u8 *) lun_data->scsi_lun;
1273 length = ((data[0] << 24) | (data[1] << 16) |
1274 (data[2] << 8) | (data[3] << 0));
1275
1276 num_luns = (length / sizeof(struct scsi_lun));
1277 if (num_luns > max_scsi_report_luns) {
1278 printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)"
1279 " of %d luns reported, try increasing"
1280 " max_scsi_report_luns.\n", devname,
1281 max_scsi_report_luns, num_luns);
1282 num_luns = max_scsi_report_luns;
1283 }
1284
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001285 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1286 "scsi scan: REPORT LUN scan\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287
1288 /*
1289 * Scan the luns in lun_data. The entry at offset 0 is really
1290 * the header, so start at 1 and go up to and including num_luns.
1291 */
1292 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1293 lun = scsilun_to_int(lunp);
1294
1295 /*
1296 * Check if the unused part of lunp is non-zero, and so
1297 * does not fit in lun.
1298 */
1299 if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) {
1300 int i;
1301
1302 /*
1303 * Output an error displaying the LUN in byte order,
1304 * this differs from what linux would print for the
1305 * integer LUN value.
1306 */
1307 printk(KERN_WARNING "scsi: %s lun 0x", devname);
1308 data = (char *)lunp->scsi_lun;
1309 for (i = 0; i < sizeof(struct scsi_lun); i++)
1310 printk("%02x", data[i]);
1311 printk(" has a LUN larger than currently supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 } else if (lun > sdev->host->max_lun) {
1313 printk(KERN_WARNING "scsi: %s lun%d has a LUN larger"
1314 " than allowed by the host adapter\n",
1315 devname, lun);
1316 } else {
1317 int res;
1318
1319 res = scsi_probe_and_add_lun(starget,
1320 lun, NULL, NULL, rescan, NULL);
1321 if (res == SCSI_SCAN_NO_RESPONSE) {
1322 /*
1323 * Got some results, but now none, abort.
1324 */
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001325 sdev_printk(KERN_ERR, sdev,
1326 "Unexpected response"
1327 " from lun %d while scanning, scan"
1328 " aborted\n", lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 break;
1330 }
1331 }
1332 }
1333
Alan Stern2ef89192005-11-08 15:51:55 -05001334 out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 kfree(lun_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 out:
James Bottomley6f3a2022005-09-22 20:33:28 -05001337 scsi_device_put(sdev);
1338 if (sdev->sdev_state == SDEV_CREATED)
1339 /*
1340 * the sdev we used didn't appear in the report luns scan
1341 */
1342 scsi_destroy_sdev(sdev);
Alan Stern2ef89192005-11-08 15:51:55 -05001343 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344}
1345
1346struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
1347 uint id, uint lun, void *hostdata)
1348{
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001349 struct scsi_device *sdev = ERR_PTR(-ENODEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 struct device *parent = &shost->shost_gendev;
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001351 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001353 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 if (!starget)
1355 return ERR_PTR(-ENOMEM);
1356
Arjan van de Ven0b950672006-01-11 13:16:10 +01001357 mutex_lock(&shost->scan_mutex);
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001358 if (scsi_host_scan_allowed(shost))
1359 scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001360 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 scsi_target_reap(starget);
1362 put_device(&starget->dev);
1363
1364 return sdev;
1365}
1366EXPORT_SYMBOL(__scsi_add_device);
1367
James Bottomley146f7262005-09-10 12:44:09 -05001368int scsi_add_device(struct Scsi_Host *host, uint channel,
1369 uint target, uint lun)
1370{
1371 struct scsi_device *sdev =
1372 __scsi_add_device(host, channel, target, lun, NULL);
1373 if (IS_ERR(sdev))
1374 return PTR_ERR(sdev);
1375
1376 scsi_device_put(sdev);
1377 return 0;
1378}
1379EXPORT_SYMBOL(scsi_add_device);
1380
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381void scsi_rescan_device(struct device *dev)
1382{
1383 struct scsi_driver *drv;
1384
1385 if (!dev->driver)
1386 return;
1387
1388 drv = to_scsi_driver(dev->driver);
1389 if (try_module_get(drv->owner)) {
1390 if (drv->rescan)
1391 drv->rescan(dev);
1392 module_put(drv->owner);
1393 }
1394}
1395EXPORT_SYMBOL(scsi_rescan_device);
1396
Alan Sterne517d312005-07-26 10:18:45 -04001397static void __scsi_scan_target(struct device *parent, unsigned int channel,
1398 unsigned int id, unsigned int lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399{
1400 struct Scsi_Host *shost = dev_to_shost(parent);
1401 int bflags = 0;
1402 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 struct scsi_target *starget;
1404
1405 if (shost->this_id == id)
1406 /*
1407 * Don't scan the host adapter
1408 */
1409 return;
1410
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412 if (!starget)
1413 return;
1414
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415 if (lun != SCAN_WILD_CARD) {
1416 /*
1417 * Scan for a specific host/chan/id/lun.
1418 */
1419 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1420 goto out_reap;
1421 }
1422
1423 /*
1424 * Scan LUN 0, if there is some response, scan further. Ideally, we
1425 * would not configure LUN 0 until all LUNs are scanned.
1426 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001427 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1428 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1429 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430 /*
1431 * The REPORT LUN did not scan the target,
1432 * do a sequential scan.
1433 */
1434 scsi_sequential_lun_scan(starget, bflags,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001435 starget->scsi_level, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437
1438 out_reap:
1439 /* now determine if the target has any children at all
1440 * and if not, nuke it */
1441 scsi_target_reap(starget);
1442
1443 put_device(&starget->dev);
1444}
Alan Sterne517d312005-07-26 10:18:45 -04001445
1446/**
1447 * scsi_scan_target - scan a target id, possibly including all LUNs on the
1448 * target.
1449 * @parent: host to scan
1450 * @channel: channel to scan
1451 * @id: target id to scan
1452 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1453 * @rescan: passed to LUN scanning routines
1454 *
1455 * Description:
1456 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1457 * and possibly all LUNs on the target id.
1458 *
1459 * First try a REPORT LUN scan, if that does not scan the target, do a
1460 * sequential scan of LUNs on the target id.
1461 **/
1462void scsi_scan_target(struct device *parent, unsigned int channel,
1463 unsigned int id, unsigned int lun, int rescan)
1464{
1465 struct Scsi_Host *shost = dev_to_shost(parent);
1466
Arjan van de Ven0b950672006-01-11 13:16:10 +01001467 mutex_lock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001468 if (scsi_host_scan_allowed(shost))
1469 __scsi_scan_target(parent, channel, id, lun, rescan);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001470 mutex_unlock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001471}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472EXPORT_SYMBOL(scsi_scan_target);
1473
1474static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1475 unsigned int id, unsigned int lun, int rescan)
1476{
1477 uint order_id;
1478
1479 if (id == SCAN_WILD_CARD)
1480 for (id = 0; id < shost->max_id; ++id) {
1481 /*
1482 * XXX adapter drivers when possible (FCP, iSCSI)
1483 * could modify max_id to match the current max,
1484 * not the absolute max.
1485 *
1486 * XXX add a shost id iterator, so for example,
1487 * the FC ID can be the same as a target id
1488 * without a huge overhead of sparse id's.
1489 */
1490 if (shost->reverse_ordering)
1491 /*
1492 * Scan from high to low id.
1493 */
1494 order_id = shost->max_id - id - 1;
1495 else
1496 order_id = id;
Alan Sterne517d312005-07-26 10:18:45 -04001497 __scsi_scan_target(&shost->shost_gendev, channel,
1498 order_id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499 }
1500 else
Alan Sterne517d312005-07-26 10:18:45 -04001501 __scsi_scan_target(&shost->shost_gendev, channel,
1502 id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503}
1504
1505int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1506 unsigned int id, unsigned int lun, int rescan)
1507{
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001508 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
1509 "%s: <%u:%u:%u>\n",
1510 __FUNCTION__, channel, id, lun));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511
1512 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
Amit Arora091686d2006-05-19 16:14:50 -07001513 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1515 return -EINVAL;
1516
Arjan van de Ven0b950672006-01-11 13:16:10 +01001517 mutex_lock(&shost->scan_mutex);
Mike Anderson82f29462005-06-16 11:14:33 -07001518 if (scsi_host_scan_allowed(shost)) {
1519 if (channel == SCAN_WILD_CARD)
1520 for (channel = 0; channel <= shost->max_channel;
1521 channel++)
1522 scsi_scan_channel(shost, channel, id, lun,
1523 rescan);
1524 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525 scsi_scan_channel(shost, channel, id, lun, rescan);
Mike Anderson82f29462005-06-16 11:14:33 -07001526 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001527 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528
1529 return 0;
1530}
1531
1532/**
1533 * scsi_scan_host - scan the given adapter
1534 * @shost: adapter to scan
1535 **/
1536void scsi_scan_host(struct Scsi_Host *shost)
1537{
1538 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1539 SCAN_WILD_CARD, 0);
1540}
1541EXPORT_SYMBOL(scsi_scan_host);
1542
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543void scsi_forget_host(struct Scsi_Host *shost)
1544{
Alan Sterna64358d2005-07-26 10:27:10 -04001545 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546 unsigned long flags;
1547
Alan Sterna64358d2005-07-26 10:27:10 -04001548 restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 spin_lock_irqsave(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001550 list_for_each_entry(sdev, &shost->__devices, siblings) {
1551 if (sdev->sdev_state == SDEV_DEL)
1552 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553 spin_unlock_irqrestore(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001554 __scsi_remove_device(sdev);
1555 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556 }
1557 spin_unlock_irqrestore(shost->host_lock, flags);
1558}
1559
1560/*
1561 * Function: scsi_get_host_dev()
1562 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001563 * Purpose: Create a scsi_device that points to the host adapter itself.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001565 * Arguments: SHpnt - Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566 *
1567 * Lock status: None assumed.
1568 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001569 * Returns: The scsi_device or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570 *
1571 * Notes:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001572 * Attach a single scsi_device to the Scsi_Host - this should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573 * be made to look like a "pseudo-device" that points to the
1574 * HA itself.
1575 *
1576 * Note - this device is not accessible from any high-level
1577 * drivers (including generics), which is probably not
1578 * optimal. We can add hooks later to attach
1579 */
1580struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1581{
Alan Sterne517d312005-07-26 10:18:45 -04001582 struct scsi_device *sdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583 struct scsi_target *starget;
1584
Arjan van de Ven0b950672006-01-11 13:16:10 +01001585 mutex_lock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001586 if (!scsi_host_scan_allowed(shost))
1587 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1589 if (!starget)
Alan Sterne517d312005-07-26 10:18:45 -04001590 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001591
1592 sdev = scsi_alloc_sdev(starget, 0, NULL);
1593 if (sdev) {
1594 sdev->sdev_gendev.parent = get_device(&starget->dev);
1595 sdev->borken = 0;
James Bottomley884d25c2006-09-05 16:26:41 -05001596 } else
1597 scsi_target_reap(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598 put_device(&starget->dev);
Alan Sterne517d312005-07-26 10:18:45 -04001599 out:
Arjan van de Ven0b950672006-01-11 13:16:10 +01001600 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001601 return sdev;
1602}
1603EXPORT_SYMBOL(scsi_get_host_dev);
1604
1605/*
1606 * Function: scsi_free_host_dev()
1607 *
1608 * Purpose: Free a scsi_device that points to the host adapter itself.
1609 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001610 * Arguments: SHpnt - Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611 *
1612 * Lock status: None assumed.
1613 *
1614 * Returns: Nothing
1615 *
1616 * Notes:
1617 */
1618void scsi_free_host_dev(struct scsi_device *sdev)
1619{
1620 BUG_ON(sdev->id != sdev->host->this_id);
1621
James Bottomley6f3a2022005-09-22 20:33:28 -05001622 scsi_destroy_sdev(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623}
1624EXPORT_SYMBOL(scsi_free_host_dev);
1625