blob: 6f51ca485f35df24e28b21752e9bae0aed20d8a9 [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>
Matthew Wilcox3e082a92006-09-28 15:19:20 -060032#include <linux/delay.h>
33#include <linux/kthread.h>
34#include <linux/spinlock.h>
Arjan van de Ven4ace92f2009-01-04 05:32:28 -080035#include <linux/async.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37#include <scsi/scsi.h>
Christoph Hellwigbeb40482006-06-10 18:01:03 +020038#include <scsi/scsi_cmnd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <scsi/scsi_device.h>
40#include <scsi/scsi_driver.h>
41#include <scsi/scsi_devinfo.h>
42#include <scsi/scsi_host.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <scsi/scsi_transport.h>
44#include <scsi/scsi_eh.h>
45
46#include "scsi_priv.h"
47#include "scsi_logging.h"
48
49#define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
50 " SCSI scanning, some SCSI devices might not be configured\n"
51
52/*
53 * Default timeout
54 */
55#define SCSI_TIMEOUT (2*HZ)
56
57/*
Robert P. J. Day405ae7d2007-02-17 19:13:42 +010058 * Prefix values for the SCSI id's (stored in sysfs name field)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 */
60#define SCSI_UID_SER_NUM 'S'
61#define SCSI_UID_UNKNOWN 'Z'
62
63/*
64 * Return values of some of the scanning functions.
65 *
66 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
67 * includes allocation or general failures preventing IO from being sent.
68 *
69 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
70 * on the given LUN.
71 *
72 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
73 * given LUN.
74 */
75#define SCSI_SCAN_NO_RESPONSE 0
76#define SCSI_SCAN_TARGET_PRESENT 1
77#define SCSI_SCAN_LUN_PRESENT 2
78
Arjan van de Ven0ad78202005-11-28 16:22:25 +010079static const char *scsi_null_device_strs = "nullnullnullnull";
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
81#define MAX_SCSI_LUNS 512
82
83#ifdef CONFIG_SCSI_MULTI_LUN
84static unsigned int max_scsi_luns = MAX_SCSI_LUNS;
85#else
86static unsigned int max_scsi_luns = 1;
87#endif
88
Masatake YAMATO10f4b892007-09-19 22:59:16 +090089module_param_named(max_luns, max_scsi_luns, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090MODULE_PARM_DESC(max_luns,
91 "last scsi LUN (should be between 1 and 2^32-1)");
92
Matthew Wilcox21db1882006-11-22 13:24:52 -070093#ifdef CONFIG_SCSI_SCAN_ASYNC
94#define SCSI_SCAN_TYPE_DEFAULT "async"
95#else
96#define SCSI_SCAN_TYPE_DEFAULT "sync"
97#endif
98
99static char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT;
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600100
101module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO);
102MODULE_PARM_DESC(scan, "sync, async or none");
103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104/*
105 * max_scsi_report_luns: the maximum number of LUNS that will be
106 * returned from the REPORT LUNS command. 8 times this value must
107 * be allocated. In theory this could be up to an 8 byte value, but
108 * in practice, the maximum number of LUNs suppored by any device
109 * is about 16k.
110 */
111static unsigned int max_scsi_report_luns = 511;
112
Masatake YAMATO10f4b892007-09-19 22:59:16 +0900113module_param_named(max_report_luns, max_scsi_report_luns, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114MODULE_PARM_DESC(max_report_luns,
115 "REPORT LUNS maximum number of LUNS received (should be"
116 " between 1 and 16384)");
117
118static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+3;
119
Masatake YAMATO10f4b892007-09-19 22:59:16 +0900120module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121MODULE_PARM_DESC(inq_timeout,
122 "Timeout (in seconds) waiting for devices to answer INQUIRY."
123 " Default is 5. Some non-compliant devices need more.");
124
Matthew Wilcox6b7f1232007-06-26 15:18:51 -0600125/* This lock protects only this list */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600126static DEFINE_SPINLOCK(async_scan_lock);
127static LIST_HEAD(scanning_hosts);
128
129struct async_scan_data {
130 struct list_head list;
131 struct Scsi_Host *shost;
132 struct completion prev_finished;
133};
134
135/**
136 * scsi_complete_async_scans - Wait for asynchronous scans to complete
137 *
Matthew Wilcox8bcc2412006-12-07 19:29:27 -0700138 * When this function returns, any host which started scanning before
139 * this function was called will have finished its scan. Hosts which
140 * started scanning after this function was called may or may not have
141 * finished.
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600142 */
143int scsi_complete_async_scans(void)
144{
145 struct async_scan_data *data;
146
147 do {
148 if (list_empty(&scanning_hosts))
149 return 0;
150 /* If we can't get memory immediately, that's OK. Just
151 * sleep a little. Even if we never get memory, the async
152 * scans will finish eventually.
153 */
154 data = kmalloc(sizeof(*data), GFP_KERNEL);
155 if (!data)
156 msleep(1);
157 } while (!data);
158
159 data->shost = NULL;
160 init_completion(&data->prev_finished);
161
162 spin_lock(&async_scan_lock);
163 /* Check that there's still somebody else on the list */
164 if (list_empty(&scanning_hosts))
165 goto done;
166 list_add_tail(&data->list, &scanning_hosts);
167 spin_unlock(&async_scan_lock);
168
169 printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n");
170 wait_for_completion(&data->prev_finished);
171
172 spin_lock(&async_scan_lock);
173 list_del(&data->list);
Matthew Wilcox8bcc2412006-12-07 19:29:27 -0700174 if (!list_empty(&scanning_hosts)) {
175 struct async_scan_data *next = list_entry(scanning_hosts.next,
176 struct async_scan_data, list);
177 complete(&next->prev_finished);
178 }
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600179 done:
180 spin_unlock(&async_scan_lock);
181
182 kfree(data);
183 return 0;
184}
185
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600186/* Only exported for the benefit of scsi_wait_scan */
187EXPORT_SYMBOL_GPL(scsi_complete_async_scans);
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600188
Hugh Dickinsf2f027c2007-05-23 14:41:42 -0700189#ifndef MODULE
190/*
191 * For async scanning we need to wait for all the scans to complete before
192 * trying to mount the root fs. Otherwise non-modular drivers may not be ready
193 * yet.
194 */
195late_initcall(scsi_complete_async_scans);
196#endif
197
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198/**
199 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
James Bottomley39216032005-06-15 18:48:29 -0500200 * @sdev: scsi device to send command to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 * @result: area to store the result of the MODE SENSE
202 *
203 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500204 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 * Called for BLIST_KEY devices.
206 **/
James Bottomley39216032005-06-15 18:48:29 -0500207static void scsi_unlock_floptical(struct scsi_device *sdev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 unsigned char *result)
209{
210 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
211
212 printk(KERN_NOTICE "scsi: unlocking floptical drive\n");
213 scsi_cmd[0] = MODE_SENSE;
214 scsi_cmd[1] = 0;
215 scsi_cmd[2] = 0x2e;
216 scsi_cmd[3] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500217 scsi_cmd[4] = 0x2a; /* size */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 scsi_cmd[5] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500219 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900220 SCSI_TIMEOUT, 3, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221}
222
223/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 * scsi_alloc_sdev - allocate and setup a scsi_Device
Rob Landleyeb448202007-11-03 13:30:39 -0500225 * @starget: which target to allocate a &scsi_device for
226 * @lun: which lun
227 * @hostdata: usually NULL and set by ->slave_alloc instead
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 *
229 * Description:
230 * Allocate, initialize for io, and return a pointer to a scsi_Device.
231 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
232 * adds scsi_Device to the appropriate list.
233 *
234 * Return value:
235 * scsi_Device pointer, or NULL on failure.
236 **/
237static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
238 unsigned int lun, void *hostdata)
239{
240 struct scsi_device *sdev;
241 int display_failure_msg = 1, ret;
242 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
Jeff Garzika341cd02007-10-29 17:15:22 -0400243 extern void scsi_evt_thread(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
Jes Sorensen24669f752006-01-16 10:31:18 -0500245 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 GFP_ATOMIC);
247 if (!sdev)
248 goto out;
249
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 sdev->vendor = scsi_null_device_strs;
251 sdev->model = scsi_null_device_strs;
252 sdev->rev = scsi_null_device_strs;
253 sdev->host = shost;
254 sdev->id = starget->id;
255 sdev->lun = lun;
256 sdev->channel = starget->channel;
257 sdev->sdev_state = SDEV_CREATED;
258 INIT_LIST_HEAD(&sdev->siblings);
259 INIT_LIST_HEAD(&sdev->same_target_siblings);
260 INIT_LIST_HEAD(&sdev->cmd_list);
261 INIT_LIST_HEAD(&sdev->starved_entry);
Jeff Garzika341cd02007-10-29 17:15:22 -0400262 INIT_LIST_HEAD(&sdev->event_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 spin_lock_init(&sdev->list_lock);
Jeff Garzika341cd02007-10-29 17:15:22 -0400264 INIT_WORK(&sdev->event_work, scsi_evt_thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266 sdev->sdev_gendev.parent = get_device(&starget->dev);
267 sdev->sdev_target = starget;
268
269 /* usually NULL and set by ->slave_alloc instead */
270 sdev->hostdata = hostdata;
271
272 /* if the device needs this changing, it may do so in the
273 * slave_configure function */
274 sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
275
276 /*
277 * Some low level driver could use device->type
278 */
279 sdev->type = -1;
280
281 /*
282 * Assume that the device will have handshaking problems,
283 * and then fix this field later if it turns out it
284 * doesn't
285 */
286 sdev->borken = 1;
287
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 sdev->request_queue = scsi_alloc_queue(sdev);
289 if (!sdev->request_queue) {
290 /* release fn is set up in scsi_sysfs_device_initialise, so
291 * have to free and put manually here */
292 put_device(&starget->dev);
Dave Jones93f560892006-03-09 10:21:27 -0500293 kfree(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 goto out;
295 }
296
297 sdev->request_queue->queuedata = sdev;
298 scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
299
300 scsi_sysfs_device_initialize(sdev);
301
302 if (shost->hostt->slave_alloc) {
303 ret = shost->hostt->slave_alloc(sdev);
304 if (ret) {
305 /*
306 * if LLDD reports slave not present, don't clutter
307 * console with alloc failure messages
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 */
309 if (ret == -ENXIO)
310 display_failure_msg = 0;
311 goto out_device_destroy;
312 }
313 }
314
315 return sdev;
316
317out_device_destroy:
James Smartc2f9e492009-01-27 11:41:36 -0500318 scsi_device_set_state(sdev, SDEV_DEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 transport_destroy_device(&sdev->sdev_gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 put_device(&sdev->sdev_gendev);
321out:
322 if (display_failure_msg)
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700323 printk(ALLOC_FAILURE_MSG, __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 return NULL;
325}
326
James Bottomley643eb2d2008-03-22 22:42:27 -0500327static void scsi_target_destroy(struct scsi_target *starget)
328{
329 struct device *dev = &starget->dev;
330 struct Scsi_Host *shost = dev_to_shost(dev->parent);
331 unsigned long flags;
332
333 transport_destroy_device(dev);
334 spin_lock_irqsave(shost->host_lock, flags);
335 if (shost->hostt->target_destroy)
336 shost->hostt->target_destroy(starget);
337 list_del_init(&starget->siblings);
338 spin_unlock_irqrestore(shost->host_lock, flags);
339 put_device(dev);
340}
341
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342static void scsi_target_dev_release(struct device *dev)
343{
344 struct device *parent = dev->parent;
345 struct scsi_target *starget = to_scsi_target(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500346
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 kfree(starget);
348 put_device(parent);
349}
350
Adrian Bunk453cd0f2008-07-03 23:47:33 -0700351static struct device_type scsi_target_type = {
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100352 .name = "scsi_target",
353 .release = scsi_target_dev_release,
354};
355
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356int scsi_is_target_device(const struct device *dev)
357{
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100358 return dev->type == &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359}
360EXPORT_SYMBOL(scsi_is_target_device);
361
362static struct scsi_target *__scsi_find_target(struct device *parent,
363 int channel, uint id)
364{
365 struct scsi_target *starget, *found_starget = NULL;
366 struct Scsi_Host *shost = dev_to_shost(parent);
367 /*
368 * Search for an existing target for this sdev.
369 */
370 list_for_each_entry(starget, &shost->__targets, siblings) {
371 if (starget->id == id &&
372 starget->channel == channel) {
373 found_starget = starget;
374 break;
375 }
376 }
377 if (found_starget)
378 get_device(&found_starget->dev);
379
380 return found_starget;
381}
382
James Bottomley884d25c2006-09-05 16:26:41 -0500383/**
384 * scsi_alloc_target - allocate a new or find an existing target
385 * @parent: parent of the target (need not be a scsi host)
386 * @channel: target channel number (zero if no channels)
387 * @id: target id number
388 *
389 * Return an existing target if one exists, provided it hasn't already
390 * gone into STARGET_DEL state, otherwise allocate a new target.
391 *
392 * The target is returned with an incremented reference, so the caller
393 * is responsible for both reaping and doing a last put
394 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395static struct scsi_target *scsi_alloc_target(struct device *parent,
396 int channel, uint id)
397{
398 struct Scsi_Host *shost = dev_to_shost(parent);
399 struct device *dev = NULL;
400 unsigned long flags;
401 const int size = sizeof(struct scsi_target)
402 + shost->transportt->target_size;
James.Smart@Emulex.Com5c44cd22005-06-10 22:24:30 -0400403 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 struct scsi_target *found_target;
Brian King32f95792006-02-22 14:28:24 -0600405 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
Jes Sorensen24669f752006-01-16 10:31:18 -0500407 starget = kzalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 if (!starget) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700409 printk(KERN_ERR "%s: allocation failure\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 return NULL;
411 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 dev = &starget->dev;
413 device_initialize(dev);
414 starget->reap_ref = 1;
415 dev->parent = get_device(parent);
Kay Sievers71610f52008-12-03 22:41:36 +0100416 dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id);
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100417#ifndef CONFIG_SYSFS_DEPRECATED
418 dev->bus = &scsi_bus_type;
419#endif
420 dev->type = &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 starget->id = id;
422 starget->channel = channel;
Mike Christief0c0a372008-08-17 15:24:38 -0500423 starget->can_queue = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 INIT_LIST_HEAD(&starget->siblings);
425 INIT_LIST_HEAD(&starget->devices);
James Bottomley643eb2d2008-03-22 22:42:27 -0500426 starget->state = STARGET_CREATED;
Alan Stern7c9d6f12007-01-08 11:12:32 -0500427 starget->scsi_level = SCSI_2;
James Bottomleyffedb452006-02-23 14:27:18 -0600428 retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 spin_lock_irqsave(shost->host_lock, flags);
430
431 found_target = __scsi_find_target(parent, channel, id);
432 if (found_target)
433 goto found;
434
435 list_add_tail(&starget->siblings, &shost->__targets);
436 spin_unlock_irqrestore(shost->host_lock, flags);
437 /* allocate and add */
James Bottomleya283bd32005-05-24 12:06:38 -0500438 transport_setup_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500439 if (shost->hostt->target_alloc) {
Brian King32f95792006-02-22 14:28:24 -0600440 error = shost->hostt->target_alloc(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500441
442 if(error) {
443 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
444 /* don't want scsi_target_reap to do the final
445 * put because it will be under the host lock */
James Bottomley643eb2d2008-03-22 22:42:27 -0500446 scsi_target_destroy(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500447 return NULL;
448 }
449 }
James Bottomley884d25c2006-09-05 16:26:41 -0500450 get_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500451
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 return starget;
453
454 found:
455 found_target->reap_ref++;
456 spin_unlock_irqrestore(shost->host_lock, flags);
James Bottomleyffedb452006-02-23 14:27:18 -0600457 if (found_target->state != STARGET_DEL) {
James Bottomley884d25c2006-09-05 16:26:41 -0500458 put_device(parent);
James Bottomleyffedb452006-02-23 14:27:18 -0600459 kfree(starget);
460 return found_target;
461 }
462 /* Unfortunately, we found a dying target; need to
463 * wait until it's dead before we can get a new one */
464 put_device(&found_target->dev);
465 flush_scheduled_work();
466 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467}
468
David Howells65f27f32006-11-22 14:55:48 +0000469static void scsi_target_reap_usercontext(struct work_struct *work)
James Bottomley65110b22006-02-14 10:48:46 -0600470{
David Howells65f27f32006-11-22 14:55:48 +0000471 struct scsi_target *starget =
472 container_of(work, struct scsi_target, ew.work);
James Bottomley863a9302005-12-15 20:01:43 -0800473
James Bottomleyffedb452006-02-23 14:27:18 -0600474 transport_remove_device(&starget->dev);
475 device_del(&starget->dev);
James Bottomley643eb2d2008-03-22 22:42:27 -0500476 scsi_target_destroy(starget);
James Bottomley863a9302005-12-15 20:01:43 -0800477}
478
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479/**
480 * scsi_target_reap - check to see if target is in use and destroy if not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 * @starget: target to be checked
482 *
483 * This is used after removing a LUN or doing a last put of the target
484 * it checks atomically that nothing is using the target and removes
485 * it if so.
486 */
487void scsi_target_reap(struct scsi_target *starget)
488{
James Bottomleyffedb452006-02-23 14:27:18 -0600489 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
490 unsigned long flags;
James Bottomley643eb2d2008-03-22 22:42:27 -0500491 enum scsi_target_state state;
492 int empty;
James Bottomleyffedb452006-02-23 14:27:18 -0600493
494 spin_lock_irqsave(shost->host_lock, flags);
James Bottomley643eb2d2008-03-22 22:42:27 -0500495 state = starget->state;
496 empty = --starget->reap_ref == 0 &&
497 list_empty(&starget->devices) ? 1 : 0;
James Bottomleyffedb452006-02-23 14:27:18 -0600498 spin_unlock_irqrestore(shost->host_lock, flags);
499
James Bottomley643eb2d2008-03-22 22:42:27 -0500500 if (!empty)
501 return;
502
503 BUG_ON(state == STARGET_DEL);
504 starget->state = STARGET_DEL;
505 if (state == STARGET_CREATED)
506 scsi_target_destroy(starget);
507 else
508 execute_in_process_context(scsi_target_reap_usercontext,
509 &starget->ew);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510}
511
512/**
Alan Sterne5b3cd42006-08-21 15:53:25 -0400513 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
514 * @s: INQUIRY result string to sanitize
515 * @len: length of the string
516 *
517 * Description:
518 * The SCSI spec says that INQUIRY vendor, product, and revision
519 * strings must consist entirely of graphic ASCII characters,
520 * padded on the right with spaces. Since not all devices obey
521 * this rule, we will replace non-graphic or non-ASCII characters
522 * with spaces. Exception: a NUL character is interpreted as a
523 * string terminator, so all the following characters are set to
524 * spaces.
525 **/
526static void sanitize_inquiry_string(unsigned char *s, int len)
527{
528 int terminated = 0;
529
530 for (; len > 0; (--len, ++s)) {
531 if (*s == 0)
532 terminated = 1;
533 if (terminated || *s < 0x20 || *s > 0x7e)
534 *s = ' ';
535 }
536}
537
538/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
James Bottomley39216032005-06-15 18:48:29 -0500540 * @sdev: scsi_device to probe
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 * @inq_result: area to store the INQUIRY result
James Bottomley39216032005-06-15 18:48:29 -0500542 * @result_len: len of inq_result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 * @bflags: store any bflags found here
544 *
545 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500546 * Probe the lun associated with @req using a standard SCSI INQUIRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 *
James Bottomley39216032005-06-15 18:48:29 -0500548 * If the INQUIRY is successful, zero is returned and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100550 * are copied to the scsi_device any flags value is stored in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400552static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
James Bottomley39216032005-06-15 18:48:29 -0500553 int result_len, int *bflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
556 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
557 int response_len = 0;
James Bottomley39216032005-06-15 18:48:29 -0500558 int pass, count, result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 struct scsi_sense_hdr sshdr;
560
561 *bflags = 0;
562
563 /* Perform up to 3 passes. The first pass uses a conservative
564 * transfer length of 36 unless sdev->inquiry_len specifies a
565 * different value. */
566 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
567 try_inquiry_len = first_inquiry_len;
568 pass = 1;
569
570 next_pass:
James Bottomley9ccfc752005-10-02 11:45:08 -0500571 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
572 "scsi scan: INQUIRY pass %d length %d\n",
573 pass, try_inquiry_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
575 /* Each pass gets up to three chances to ignore Unit Attention */
576 for (count = 0; count < 3; ++count) {
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900577 int resid;
578
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 memset(scsi_cmd, 0, 6);
580 scsi_cmd[0] = INQUIRY;
581 scsi_cmd[4] = (unsigned char) try_inquiry_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582
583 memset(inq_result, 0, try_inquiry_len);
James Bottomley39216032005-06-15 18:48:29 -0500584
585 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -0500586 inq_result, try_inquiry_len, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900587 HZ / 2 + HZ * scsi_inq_timeout, 3,
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900588 &resid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
590 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
591 "with code 0x%x\n",
James Bottomley39216032005-06-15 18:48:29 -0500592 result ? "failed" : "successful", result));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
James Bottomley39216032005-06-15 18:48:29 -0500594 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 /*
596 * not-ready to ready transition [asc/ascq=0x28/0x0]
597 * or power-on, reset [asc/ascq=0x29/0x0], continue.
598 * INQUIRY should not yield UNIT_ATTENTION
599 * but many buggy devices do so anyway.
600 */
James Bottomley39216032005-06-15 18:48:29 -0500601 if ((driver_byte(result) & DRIVER_SENSE) &&
James Bottomleyea73a9f2005-08-28 11:33:52 -0500602 scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 if ((sshdr.sense_key == UNIT_ATTENTION) &&
604 ((sshdr.asc == 0x28) ||
605 (sshdr.asc == 0x29)) &&
606 (sshdr.ascq == 0))
607 continue;
608 }
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900609 } else {
610 /*
611 * if nothing was transferred, we try
612 * again. It's a workaround for some USB
613 * devices.
614 */
615 if (resid == try_inquiry_len)
616 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 }
618 break;
619 }
620
James Bottomley39216032005-06-15 18:48:29 -0500621 if (result == 0) {
Alan Sterne5b3cd42006-08-21 15:53:25 -0400622 sanitize_inquiry_string(&inq_result[8], 8);
623 sanitize_inquiry_string(&inq_result[16], 16);
624 sanitize_inquiry_string(&inq_result[32], 4);
625
626 response_len = inq_result[4] + 5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 if (response_len > 255)
628 response_len = first_inquiry_len; /* sanity */
629
630 /*
631 * Get any flags for this device.
632 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100633 * XXX add a bflags to scsi_device, and replace the
634 * corresponding bit fields in scsi_device, so bflags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 * need not be passed as an argument.
636 */
637 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
638 &inq_result[16]);
639
640 /* When the first pass succeeds we gain information about
641 * what larger transfer lengths might work. */
642 if (pass == 1) {
643 if (BLIST_INQUIRY_36 & *bflags)
644 next_inquiry_len = 36;
645 else if (BLIST_INQUIRY_58 & *bflags)
646 next_inquiry_len = 58;
647 else if (sdev->inquiry_len)
648 next_inquiry_len = sdev->inquiry_len;
649 else
650 next_inquiry_len = response_len;
651
652 /* If more data is available perform the second pass */
653 if (next_inquiry_len > try_inquiry_len) {
654 try_inquiry_len = next_inquiry_len;
655 pass = 2;
656 goto next_pass;
657 }
658 }
659
660 } else if (pass == 2) {
661 printk(KERN_INFO "scsi scan: %d byte inquiry failed. "
662 "Consider BLIST_INQUIRY_36 for this device\n",
663 try_inquiry_len);
664
665 /* If this pass failed, the third pass goes back and transfers
666 * the same amount as we successfully got in the first pass. */
667 try_inquiry_len = first_inquiry_len;
668 pass = 3;
669 goto next_pass;
670 }
671
672 /* If the last transfer attempt got an error, assume the
673 * peripheral doesn't exist or is dead. */
James Bottomley39216032005-06-15 18:48:29 -0500674 if (result)
675 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676
677 /* Don't report any more data than the device says is valid */
678 sdev->inquiry_len = min(try_inquiry_len, response_len);
679
680 /*
681 * XXX Abort if the response length is less than 36? If less than
682 * 32, the lookup of the device flags (above) could be invalid,
683 * and it would be possible to take an incorrect action - we do
684 * not want to hang because of a short INQUIRY. On the flip side,
685 * if the device is spun down or becoming ready (and so it gives a
686 * short INQUIRY), an abort here prevents any further use of the
687 * device, including spin up.
688 *
Alan Sterne423ee32007-02-16 01:46:38 -0800689 * On the whole, the best approach seems to be to assume the first
690 * 36 bytes are valid no matter what the device says. That's
691 * better than copying < 36 bytes to the inquiry-result buffer
692 * and displaying garbage for the Vendor, Product, or Revision
693 * strings.
694 */
695 if (sdev->inquiry_len < 36) {
696 printk(KERN_INFO "scsi scan: INQUIRY result too short (%d),"
697 " using 36\n", sdev->inquiry_len);
698 sdev->inquiry_len = 36;
699 }
700
701 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 * Related to the above issue:
703 *
704 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
705 * and if not ready, sent a START_STOP to start (maybe spin up) and
706 * then send the INQUIRY again, since the INQUIRY can change after
707 * a device is initialized.
708 *
709 * Ideally, start a device if explicitly asked to do so. This
710 * assumes that a device is spun up on power on, spun down on
711 * request, and then spun up on request.
712 */
713
714 /*
715 * The scanning code needs to know the scsi_level, even if no
716 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
717 * non-zero LUNs can be scanned.
718 */
719 sdev->scsi_level = inq_result[2] & 0x07;
720 if (sdev->scsi_level >= 2 ||
721 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
722 sdev->scsi_level++;
James Bottomley6f3a2022005-09-22 20:33:28 -0500723 sdev->sdev_target->scsi_level = sdev->scsi_level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724
James Bottomley39216032005-06-15 18:48:29 -0500725 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726}
727
728/**
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100729 * scsi_add_lun - allocate and fully initialze a scsi_device
Matthew Wilcox6d877682007-07-11 12:54:55 -0600730 * @sdev: holds information to be stored in the new scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 * @inq_result: holds the result of a previous INQUIRY to the LUN
732 * @bflags: black/white list flag
Matthew Wilcox6d877682007-07-11 12:54:55 -0600733 * @async: 1 if this device is being scanned asynchronously
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 *
735 * Description:
Matthew Wilcox6d877682007-07-11 12:54:55 -0600736 * Initialize the scsi_device @sdev. Optionally set fields based
737 * on values in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 *
739 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100740 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
741 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400743static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600744 int *bflags, int async)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745{
James Bottomley6f4267e2008-08-22 16:53:31 -0500746 int ret;
747
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 /*
749 * XXX do not save the inquiry, since it can change underneath us,
750 * save just vendor/model/rev.
751 *
752 * Rather than save it and have an ioctl that retrieves the saved
753 * value, have an ioctl that executes the same INQUIRY code used
754 * in scsi_probe_lun, let user level programs doing INQUIRY
755 * scanning run at their own risk, or supply a user level program
756 * that can correctly scan.
757 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758
Alan Stern09123d22006-11-10 12:27:57 -0800759 /*
760 * Copy at least 36 bytes of INQUIRY data, so that we don't
761 * dereference unallocated memory when accessing the Vendor,
762 * Product, and Revision strings. Badly behaved devices may set
763 * the INQUIRY Additional Length byte to a small value, indicating
764 * these strings are invalid, but often they contain plausible data
765 * nonetheless. It doesn't matter if the device sent < 36 bytes
766 * total, since scsi_probe_lun() initializes inq_result with 0s.
767 */
768 sdev->inquiry = kmemdup(inq_result,
769 max_t(size_t, sdev->inquiry_len, 36),
770 GFP_ATOMIC);
771 if (sdev->inquiry == NULL)
772 return SCSI_SCAN_NO_RESPONSE;
773
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 sdev->vendor = (char *) (sdev->inquiry + 8);
775 sdev->model = (char *) (sdev->inquiry + 16);
776 sdev->rev = (char *) (sdev->inquiry + 32);
777
778 if (*bflags & BLIST_ISROM) {
Matthew Wilcox6d877682007-07-11 12:54:55 -0600779 sdev->type = TYPE_ROM;
780 sdev->removable = 1;
781 } else {
782 sdev->type = (inq_result[0] & 0x1f);
783 sdev->removable = (inq_result[1] & 0x80) >> 7;
784 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785
Matthew Wilcox6d877682007-07-11 12:54:55 -0600786 switch (sdev->type) {
James Bottomleyddaf6fc2006-12-13 10:10:40 -0600787 case TYPE_RBC:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 case TYPE_TAPE:
789 case TYPE_DISK:
790 case TYPE_PRINTER:
791 case TYPE_MOD:
792 case TYPE_PROCESSOR:
793 case TYPE_SCANNER:
794 case TYPE_MEDIUM_CHANGER:
795 case TYPE_ENCLOSURE:
796 case TYPE_COMM:
James Bottomley4d7db042006-03-31 20:07:45 -0600797 case TYPE_RAID:
Boaz Harrosh82443a52009-01-25 16:51:33 +0200798 case TYPE_OSD:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 sdev->writeable = 1;
800 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 case TYPE_ROM:
James Bottomleyddaf6fc2006-12-13 10:10:40 -0600802 case TYPE_WORM:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 sdev->writeable = 0;
804 break;
805 default:
806 printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type);
807 }
808
Matthew Wilcox6d877682007-07-11 12:54:55 -0600809 if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {
810 /* RBC and MMC devices can return SCSI-3 compliance and yet
811 * still not support REPORT LUNS, so make them act as
812 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
813 * specifically set */
814 if ((*bflags & BLIST_REPORTLUN2) == 0)
815 *bflags |= BLIST_NOREPORTLUN;
816 }
817
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 /*
819 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
820 * spec says: The device server is capable of supporting the
821 * specified peripheral device type on this logical unit. However,
822 * the physical device is not currently connected to this logical
823 * unit.
824 *
825 * The above is vague, as it implies that we could treat 001 and
826 * 011 the same. Stay compatible with previous code, and create a
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100827 * scsi_device for a PQ of 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 *
829 * Don't set the device offline here; rather let the upper
830 * level drivers eval the PQ to decide whether they should
831 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
832 */
833
834 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 sdev->lockable = sdev->removable;
836 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
837
Matthew Wilcox6d877682007-07-11 12:54:55 -0600838 if (sdev->scsi_level >= SCSI_3 ||
839 (sdev->inquiry_len > 56 && inq_result[56] & 0x04))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 sdev->ppr = 1;
841 if (inq_result[7] & 0x60)
842 sdev->wdtr = 1;
843 if (inq_result[7] & 0x10)
844 sdev->sdtr = 1;
845
James Bottomley19ac0db2006-08-06 18:15:22 -0500846 sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d "
Matthew Wilcox4ff36712006-07-04 12:15:20 -0600847 "ANSI: %d%s\n", scsi_device_type(sdev->type),
848 sdev->vendor, sdev->model, sdev->rev,
849 sdev->inq_periph_qual, inq_result[2] & 0x07,
850 (inq_result[3] & 0x0f) == 1 ? " CCS" : "");
851
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
853 !(*bflags & BLIST_NOTQ))
854 sdev->tagged_supported = 1;
Matthew Wilcox6d877682007-07-11 12:54:55 -0600855
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 /*
857 * Some devices (Texel CD ROM drives) have handshaking problems
858 * when used with the Seagate controllers. borken is initialized
859 * to 1, and then set it to 0 here.
860 */
861 if ((*bflags & BLIST_BORKEN) == 0)
862 sdev->borken = 0;
863
Matthew Wilcox6d877682007-07-11 12:54:55 -0600864 if (*bflags & BLIST_NO_ULD_ATTACH)
865 sdev->no_uld_attach = 1;
866
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 /*
868 * Apparently some really broken devices (contrary to the SCSI
869 * standards) need to be selected without asserting ATN
870 */
871 if (*bflags & BLIST_SELECT_NO_ATN)
872 sdev->select_no_atn = 1;
873
874 /*
James Bottomley4d7db042006-03-31 20:07:45 -0600875 * Maximum 512 sector transfer length
876 * broken RA4x00 Compaq Disk Array
877 */
878 if (*bflags & BLIST_MAX_512)
879 blk_queue_max_sectors(sdev->request_queue, 512);
880
881 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 * Some devices may not want to have a start command automatically
883 * issued when a device is added.
884 */
885 if (*bflags & BLIST_NOSTARTONADD)
886 sdev->no_start_on_add = 1;
887
888 if (*bflags & BLIST_SINGLELUN)
Tony Battersby25d7c362007-11-12 10:00:44 -0500889 scsi_target(sdev)->single_lun = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 sdev->use_10_for_rw = 1;
892
893 if (*bflags & BLIST_MS_SKIP_PAGE_08)
894 sdev->skip_ms_page_8 = 1;
895
896 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
897 sdev->skip_ms_page_3f = 1;
898
899 if (*bflags & BLIST_USE_10_BYTE_MS)
900 sdev->use_10_for_ms = 1;
901
902 /* set the device running here so that slave configure
903 * may do I/O */
James Bottomley6f4267e2008-08-22 16:53:31 -0500904 ret = scsi_device_set_state(sdev, SDEV_RUNNING);
905 if (ret) {
906 ret = scsi_device_set_state(sdev, SDEV_BLOCK);
907
908 if (ret) {
909 sdev_printk(KERN_ERR, sdev,
910 "in wrong state %s to complete scan\n",
911 scsi_device_state_name(sdev->sdev_state));
912 return SCSI_SCAN_NO_RESPONSE;
913 }
914 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915
916 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
917 sdev->use_192_bytes_for_3f = 1;
918
919 if (*bflags & BLIST_NOT_LOCKABLE)
920 sdev->lockable = 0;
921
922 if (*bflags & BLIST_RETRY_HWERROR)
923 sdev->retry_hwerror = 1;
924
925 transport_configure_device(&sdev->sdev_gendev);
926
Christoph Hellwig93805092006-02-17 12:11:29 +0100927 if (sdev->host->hostt->slave_configure) {
James Bottomley6f4267e2008-08-22 16:53:31 -0500928 ret = sdev->host->hostt->slave_configure(sdev);
Christoph Hellwig93805092006-02-17 12:11:29 +0100929 if (ret) {
930 /*
931 * if LLDD reports slave not present, don't clutter
932 * console with alloc failure messages
933 */
934 if (ret != -ENXIO) {
935 sdev_printk(KERN_ERR, sdev,
936 "failed to configure device\n");
937 }
938 return SCSI_SCAN_NO_RESPONSE;
939 }
940 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941
942 /*
943 * Ok, the device is now all set up, we can
944 * register it and tell the rest of the kernel
945 * about it.
946 */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600947 if (!async && scsi_sysfs_add_sdev(sdev) != 0)
Alan Sternb24b1032005-07-27 11:43:46 -0700948 return SCSI_SCAN_NO_RESPONSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949
950 return SCSI_SCAN_LUN_PRESENT;
951}
952
James Bottomley6f3a2022005-09-22 20:33:28 -0500953static inline void scsi_destroy_sdev(struct scsi_device *sdev)
954{
Brian King309bd272006-06-27 11:10:43 -0500955 scsi_device_set_state(sdev, SDEV_DEL);
James Bottomley6f3a2022005-09-22 20:33:28 -0500956 if (sdev->host->hostt->slave_destroy)
957 sdev->host->hostt->slave_destroy(sdev);
958 transport_destroy_device(&sdev->sdev_gendev);
959 put_device(&sdev->sdev_gendev);
960}
961
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700962#ifdef CONFIG_SCSI_LOGGING
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200963/**
Rob Landleyeb448202007-11-03 13:30:39 -0500964 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200965 * @buf: Output buffer with at least end-first+1 bytes of space
966 * @inq: Inquiry buffer (input)
967 * @first: Offset of string into inq
968 * @end: Index after last character in inq
969 */
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700970static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200971 unsigned first, unsigned end)
972{
973 unsigned term = 0, idx;
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700974
975 for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
976 if (inq[idx+first] > ' ') {
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200977 buf[idx] = inq[idx+first];
978 term = idx+1;
979 } else {
980 buf[idx] = ' ';
981 }
982 }
983 buf[term] = 0;
984 return buf;
985}
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700986#endif
James Bottomley6f3a2022005-09-22 20:33:28 -0500987
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988/**
989 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
990 * @starget: pointer to target device structure
991 * @lun: LUN of target device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 * @bflagsp: store bflags here if not NULL
Rob Landleyeb448202007-11-03 13:30:39 -0500993 * @sdevp: probe the LUN corresponding to this scsi_device
994 * @rescan: if nonzero skip some code only needed on first scan
995 * @hostdata: passed to scsi_alloc_sdev()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 *
997 * Description:
998 * Call scsi_probe_lun, if a LUN with an attached device is found,
999 * allocate and set it up by calling scsi_add_lun.
1000 *
1001 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001002 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
1004 * attached at the LUN
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001005 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 **/
1007static int scsi_probe_and_add_lun(struct scsi_target *starget,
1008 uint lun, int *bflagsp,
1009 struct scsi_device **sdevp, int rescan,
1010 void *hostdata)
1011{
1012 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 unsigned char *result;
James Bottomley39216032005-06-15 18:48:29 -05001014 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1016
1017 /*
1018 * The rescan flag is used as an optimization, the first scan of a
1019 * host adapter calls into here with rescan == 0.
1020 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001021 sdev = scsi_device_lookup_by_target(starget, lun);
1022 if (sdev) {
James Bottomley0f1d87a2008-08-22 16:43:59 -05001023 if (rescan || !scsi_device_created(sdev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1025 "scsi scan: device exists on %s\n",
Kay Sievers71610f52008-12-03 22:41:36 +01001026 dev_name(&sdev->sdev_gendev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 if (sdevp)
1028 *sdevp = sdev;
1029 else
1030 scsi_device_put(sdev);
1031
1032 if (bflagsp)
1033 *bflagsp = scsi_get_device_flags(sdev,
1034 sdev->vendor,
1035 sdev->model);
1036 return SCSI_SCAN_LUN_PRESENT;
1037 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001038 scsi_device_put(sdev);
1039 } else
1040 sdev = scsi_alloc_sdev(starget, lun, hostdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 if (!sdev)
1042 goto out;
James Bottomley39216032005-06-15 18:48:29 -05001043
1044 result = kmalloc(result_len, GFP_ATOMIC |
Al Virobc861202005-04-24 12:28:34 -07001045 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 if (!result)
James Bottomley39216032005-06-15 18:48:29 -05001047 goto out_free_sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048
James Bottomley39216032005-06-15 18:48:29 -05001049 if (scsi_probe_lun(sdev, result, result_len, &bflags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 goto out_free_result;
1051
Kurt Garloff4186ab12006-04-03 15:16:48 +02001052 if (bflagsp)
1053 *bflagsp = bflags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 /*
1055 * result contains valid SCSI INQUIRY data.
1056 */
Kurt Garloff13f7e5a2006-04-03 15:20:08 +02001057 if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 /*
1059 * For a Peripheral qualifier 3 (011b), the SCSI
1060 * spec says: The device server is not capable of
1061 * supporting a physical device on this logical
1062 * unit.
1063 *
1064 * For disks, this implies that there is no
1065 * logical disk configured at sdev->lun, but there
1066 * is a target id responding.
1067 */
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001068 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
1069 " peripheral qualifier of 3, device not"
1070 " added\n"))
1071 if (lun == 0) {
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001072 SCSI_LOG_SCAN_BUS(1, {
1073 unsigned char vend[9];
1074 unsigned char mod[17];
1075
1076 sdev_printk(KERN_INFO, sdev,
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001077 "scsi scan: consider passing scsi_mod."
Kurt Garloff3424a652007-01-09 02:28:54 +01001078 "dev_flags=%s:%s:0x240 or 0x1000240\n",
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001079 scsi_inq_str(vend, result, 8, 16),
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001080 scsi_inq_str(mod, result, 16, 32));
1081 });
James Bottomley643eb2d2008-03-22 22:42:27 -05001082
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001083 }
James Bottomley643eb2d2008-03-22 22:42:27 -05001084
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 res = SCSI_SCAN_TARGET_PRESENT;
1086 goto out_free_result;
1087 }
1088
Alan Stern1bfc5d92006-02-09 15:26:18 -05001089 /*
dave wysochanski84961f22006-08-09 14:56:32 -04001090 * Some targets may set slight variations of PQ and PDT to signal
1091 * that no LUN is present, so don't add sdev in these cases.
1092 * Two specific examples are:
1093 * 1) NetApp targets: return PQ=1, PDT=0x1f
1094 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1095 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1096 *
1097 * References:
1098 * 1) SCSI SPC-3, pp. 145-146
1099 * PQ=1: "A peripheral device having the specified peripheral
1100 * device type is not connected to this logical unit. However, the
1101 * device server is capable of supporting the specified peripheral
1102 * device type on this logical unit."
1103 * PDT=0x1f: "Unknown or no device type"
1104 * 2) USB UFI 1.0, p. 20
1105 * PDT=00h Direct-access device (floppy)
1106 * PDT=1Fh none (no FDD connected to the requested logical unit)
Alan Stern1bfc5d92006-02-09 15:26:18 -05001107 */
dave wysochanski84961f22006-08-09 14:56:32 -04001108 if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) &&
James Bottomley01b291b2008-08-21 15:14:14 -05001109 (result[0] & 0x1f) == 0x1f &&
1110 !scsi_is_wlun(lun)) {
Alan Stern1bfc5d92006-02-09 15:26:18 -05001111 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1112 "scsi scan: peripheral device type"
1113 " of 31, no device added\n"));
1114 res = SCSI_SCAN_TARGET_PRESENT;
1115 goto out_free_result;
1116 }
1117
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001118 res = scsi_add_lun(sdev, result, &bflags, shost->async_scan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 if (res == SCSI_SCAN_LUN_PRESENT) {
1120 if (bflags & BLIST_KEY) {
1121 sdev->lockable = 0;
James Bottomley39216032005-06-15 18:48:29 -05001122 scsi_unlock_floptical(sdev, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 }
1125
1126 out_free_result:
1127 kfree(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 out_free_sdev:
1129 if (res == SCSI_SCAN_LUN_PRESENT) {
1130 if (sdevp) {
Alan Sternb70d37b2005-07-26 10:30:40 -04001131 if (scsi_device_get(sdev) == 0) {
1132 *sdevp = sdev;
1133 } else {
1134 __scsi_remove_device(sdev);
1135 res = SCSI_SCAN_NO_RESPONSE;
1136 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001138 } else
1139 scsi_destroy_sdev(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 out:
1141 return res;
1142}
1143
1144/**
1145 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1146 * @starget: pointer to target structure to scan
1147 * @bflags: black/white list flag for LUN 0
Rob Landleyeb448202007-11-03 13:30:39 -05001148 * @scsi_level: Which version of the standard does this device adhere to
1149 * @rescan: passed to scsi_probe_add_lun()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 *
1151 * Description:
1152 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1153 * scanned) to some maximum lun until a LUN is found with no device
1154 * attached. Use the bflags to figure out any oddities.
1155 *
1156 * Modifies sdevscan->lun.
1157 **/
1158static void scsi_sequential_lun_scan(struct scsi_target *starget,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001159 int bflags, int scsi_level, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160{
1161 unsigned int sparse_lun, lun, max_dev_lun;
1162 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1163
1164 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of"
Kay Sievers71610f52008-12-03 22:41:36 +01001165 "%s\n", dev_name(&starget->dev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166
1167 max_dev_lun = min(max_scsi_luns, shost->max_lun);
1168 /*
1169 * If this device is known to support sparse multiple units,
1170 * override the other settings, and scan all of them. Normally,
1171 * SCSI-3 devices should be scanned via the REPORT LUNS.
1172 */
1173 if (bflags & BLIST_SPARSELUN) {
1174 max_dev_lun = shost->max_lun;
1175 sparse_lun = 1;
1176 } else
1177 sparse_lun = 0;
1178
1179 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180 * If less than SCSI_1_CSS, and no special lun scaning, stop
1181 * scanning; this matches 2.4 behaviour, but could just be a bug
1182 * (to continue scanning a SCSI_1_CSS device).
1183 *
1184 * This test is broken. We might not have any device on lun0 for
1185 * a sparselun device, and if that's the case then how would we
1186 * know the real scsi_level, eh? It might make sense to just not
1187 * scan any SCSI_1 device for non-0 luns, but that check would best
1188 * go into scsi_alloc_sdev() and just have it return null when asked
1189 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1190 *
1191 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1192 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1193 == 0))
1194 return;
1195 */
1196 /*
1197 * If this device is known to support multiple units, override
1198 * the other settings, and scan all of them.
1199 */
1200 if (bflags & BLIST_FORCELUN)
1201 max_dev_lun = shost->max_lun;
1202 /*
1203 * REGAL CDC-4X: avoid hang after LUN 4
1204 */
1205 if (bflags & BLIST_MAX5LUN)
1206 max_dev_lun = min(5U, max_dev_lun);
1207 /*
1208 * Do not scan SCSI-2 or lower device past LUN 7, unless
1209 * BLIST_LARGELUN.
1210 */
1211 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
1212 max_dev_lun = min(8U, max_dev_lun);
1213
1214 /*
1215 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1216 * until we reach the max, or no LUN is found and we are not
1217 * sparse_lun.
1218 */
1219 for (lun = 1; lun < max_dev_lun; ++lun)
1220 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
1221 NULL) != SCSI_SCAN_LUN_PRESENT) &&
1222 !sparse_lun)
1223 return;
1224}
1225
1226/**
1227 * scsilun_to_int: convert a scsi_lun to an int
1228 * @scsilun: struct scsi_lun to be converted.
1229 *
1230 * Description:
1231 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1232 * integer, and return the result. The caller must check for
1233 * truncation before using this function.
1234 *
1235 * Notes:
1236 * The struct scsi_lun is assumed to be four levels, with each level
1237 * effectively containing a SCSI byte-ordered (big endian) short; the
1238 * addressing bits of each level are ignored (the highest two bits).
1239 * For a description of the LUN format, post SCSI-3 see the SCSI
1240 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1241 *
1242 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1243 * the integer: 0x0b030a04
1244 **/
Christof Schmitt462b7852007-06-19 10:25:30 +02001245int scsilun_to_int(struct scsi_lun *scsilun)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246{
1247 int i;
1248 unsigned int lun;
1249
1250 lun = 0;
1251 for (i = 0; i < sizeof(lun); i += 2)
1252 lun = lun | (((scsilun->scsi_lun[i] << 8) |
1253 scsilun->scsi_lun[i + 1]) << (i * 8));
1254 return lun;
1255}
Christof Schmitt462b7852007-06-19 10:25:30 +02001256EXPORT_SYMBOL(scsilun_to_int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257
1258/**
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001259 * int_to_scsilun: reverts an int into a scsi_lun
Rob Landleyeb448202007-11-03 13:30:39 -05001260 * @lun: integer to be reverted
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001261 * @scsilun: struct scsi_lun to be set.
1262 *
1263 * Description:
1264 * Reverts the functionality of the scsilun_to_int, which packed
1265 * an 8-byte lun value into an int. This routine unpacks the int
1266 * back into the lun value.
1267 * Note: the scsilun_to_int() routine does not truly handle all
1268 * 8bytes of the lun value. This functions restores only as much
1269 * as was set by the routine.
1270 *
1271 * Notes:
1272 * Given an integer : 0x0b030a04, this function returns a
1273 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1274 *
1275 **/
1276void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun)
1277{
1278 int i;
1279
1280 memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
1281
1282 for (i = 0; i < sizeof(lun); i += 2) {
1283 scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
1284 scsilun->scsi_lun[i+1] = lun & 0xFF;
1285 lun = lun >> 16;
1286 }
1287}
1288EXPORT_SYMBOL(int_to_scsilun);
1289
1290/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
Rob Landleyeb448202007-11-03 13:30:39 -05001292 * @starget: which target
1293 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1294 * @rescan: nonzero if we can skip code only needed on first scan
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 *
1296 * Description:
Rob Landleyeb448202007-11-03 13:30:39 -05001297 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1298 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299 *
Rob Landleyeb448202007-11-03 13:30:39 -05001300 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1301 * LUNs even if it's older than SCSI-3.
1302 * If BLIST_NOREPORTLUN is set, return 1 always.
1303 * If BLIST_NOLUN is set, return 0 always.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304 *
1305 * Return:
1306 * 0: scan completed (or no memory, so further scanning is futile)
Rob Landleyeb448202007-11-03 13:30:39 -05001307 * 1: could not scan with REPORT LUN
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308 **/
James Bottomley6f3a2022005-09-22 20:33:28 -05001309static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 int rescan)
1311{
1312 char devname[64];
1313 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1314 unsigned int length;
1315 unsigned int lun;
1316 unsigned int num_luns;
1317 unsigned int retries;
James Bottomley39216032005-06-15 18:48:29 -05001318 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 struct scsi_lun *lunp, *lun_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320 u8 *data;
1321 struct scsi_sense_hdr sshdr;
James Bottomley6f3a2022005-09-22 20:33:28 -05001322 struct scsi_device *sdev;
1323 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
Alan Stern2ef89192005-11-08 15:51:55 -05001324 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325
1326 /*
1327 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1328 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1329 * support more than 8 LUNs.
1330 */
James Bottomley4d7db042006-03-31 20:07:45 -06001331 if (bflags & BLIST_NOREPORTLUN)
1332 return 1;
1333 if (starget->scsi_level < SCSI_2 &&
1334 starget->scsi_level != SCSI_UNKNOWN)
1335 return 1;
1336 if (starget->scsi_level < SCSI_3 &&
1337 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 return 1;
1339 if (bflags & BLIST_NOLUN)
1340 return 0;
1341
James Bottomley6f3a2022005-09-22 20:33:28 -05001342 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1343 sdev = scsi_alloc_sdev(starget, 0, NULL);
1344 if (!sdev)
1345 return 0;
1346 if (scsi_device_get(sdev))
1347 return 0;
1348 }
1349
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 sprintf(devname, "host %d channel %d id %d",
James Bottomley6f3a2022005-09-22 20:33:28 -05001351 shost->host_no, sdev->channel, sdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352
1353 /*
1354 * Allocate enough to hold the header (the same size as one scsi_lun)
1355 * plus the max number of luns we are requesting.
1356 *
1357 * Reallocating and trying again (with the exact amount we need)
1358 * would be nice, but then we need to somehow limit the size
1359 * allocated based on the available memory and the limits of
1360 * kmalloc - we don't want a kmalloc() failure of a huge value to
1361 * prevent us from finding any LUNs on this target.
1362 */
1363 length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun);
1364 lun_data = kmalloc(length, GFP_ATOMIC |
1365 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
James Bottomley6f3a2022005-09-22 20:33:28 -05001366 if (!lun_data) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001367 printk(ALLOC_FAILURE_MSG, __func__);
James Bottomley39216032005-06-15 18:48:29 -05001368 goto out;
James Bottomley6f3a2022005-09-22 20:33:28 -05001369 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370
1371 scsi_cmd[0] = REPORT_LUNS;
1372
1373 /*
1374 * bytes 1 - 5: reserved, set to zero.
1375 */
1376 memset(&scsi_cmd[1], 0, 5);
1377
1378 /*
1379 * bytes 6 - 9: length of the command.
1380 */
1381 scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff;
1382 scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff;
1383 scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff;
1384 scsi_cmd[9] = (unsigned char) length & 0xff;
1385
1386 scsi_cmd[10] = 0; /* reserved */
1387 scsi_cmd[11] = 0; /* control */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388
1389 /*
1390 * We can get a UNIT ATTENTION, for example a power on/reset, so
1391 * retry a few times (like sd.c does for TEST UNIT READY).
1392 * Experience shows some combinations of adapter/devices get at
1393 * least two power on/resets.
1394 *
1395 * Illegal requests (for devices that do not support REPORT LUNS)
1396 * should come through as a check condition, and will not generate
1397 * a retry.
1398 */
1399 for (retries = 0; retries < 3; retries++) {
1400 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending"
1401 " REPORT LUNS to %s (try %d)\n", devname,
1402 retries));
James Bottomley39216032005-06-15 18:48:29 -05001403
James Bottomley39216032005-06-15 18:48:29 -05001404 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001405 lun_data, length, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09001406 SCSI_TIMEOUT + 4 * HZ, 3, NULL);
James Bottomley39216032005-06-15 18:48:29 -05001407
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS"
James Bottomley39216032005-06-15 18:48:29 -05001409 " %s (try %d) result 0x%x\n", result
1410 ? "failed" : "successful", retries, result));
1411 if (result == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412 break;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001413 else if (scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 if (sshdr.sense_key != UNIT_ATTENTION)
1415 break;
1416 }
1417 }
1418
James Bottomley39216032005-06-15 18:48:29 -05001419 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 /*
1421 * The device probably does not support a REPORT LUN command
1422 */
Alan Stern2ef89192005-11-08 15:51:55 -05001423 ret = 1;
1424 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426
1427 /*
1428 * Get the length from the first four bytes of lun_data.
1429 */
1430 data = (u8 *) lun_data->scsi_lun;
1431 length = ((data[0] << 24) | (data[1] << 16) |
1432 (data[2] << 8) | (data[3] << 0));
1433
1434 num_luns = (length / sizeof(struct scsi_lun));
1435 if (num_luns > max_scsi_report_luns) {
1436 printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)"
1437 " of %d luns reported, try increasing"
1438 " max_scsi_report_luns.\n", devname,
1439 max_scsi_report_luns, num_luns);
1440 num_luns = max_scsi_report_luns;
1441 }
1442
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001443 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1444 "scsi scan: REPORT LUN scan\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445
1446 /*
1447 * Scan the luns in lun_data. The entry at offset 0 is really
1448 * the header, so start at 1 and go up to and including num_luns.
1449 */
1450 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1451 lun = scsilun_to_int(lunp);
1452
1453 /*
1454 * Check if the unused part of lunp is non-zero, and so
1455 * does not fit in lun.
1456 */
1457 if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) {
1458 int i;
1459
1460 /*
1461 * Output an error displaying the LUN in byte order,
1462 * this differs from what linux would print for the
1463 * integer LUN value.
1464 */
1465 printk(KERN_WARNING "scsi: %s lun 0x", devname);
1466 data = (char *)lunp->scsi_lun;
1467 for (i = 0; i < sizeof(struct scsi_lun); i++)
1468 printk("%02x", data[i]);
1469 printk(" has a LUN larger than currently supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470 } else if (lun > sdev->host->max_lun) {
1471 printk(KERN_WARNING "scsi: %s lun%d has a LUN larger"
1472 " than allowed by the host adapter\n",
1473 devname, lun);
1474 } else {
1475 int res;
1476
1477 res = scsi_probe_and_add_lun(starget,
1478 lun, NULL, NULL, rescan, NULL);
1479 if (res == SCSI_SCAN_NO_RESPONSE) {
1480 /*
1481 * Got some results, but now none, abort.
1482 */
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001483 sdev_printk(KERN_ERR, sdev,
1484 "Unexpected response"
1485 " from lun %d while scanning, scan"
1486 " aborted\n", lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 break;
1488 }
1489 }
1490 }
1491
Alan Stern2ef89192005-11-08 15:51:55 -05001492 out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493 kfree(lun_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494 out:
James Bottomley6f3a2022005-09-22 20:33:28 -05001495 scsi_device_put(sdev);
James Bottomley0f1d87a2008-08-22 16:43:59 -05001496 if (scsi_device_created(sdev))
James Bottomley6f3a2022005-09-22 20:33:28 -05001497 /*
1498 * the sdev we used didn't appear in the report luns scan
1499 */
1500 scsi_destroy_sdev(sdev);
Alan Stern2ef89192005-11-08 15:51:55 -05001501 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502}
1503
1504struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
1505 uint id, uint lun, void *hostdata)
1506{
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001507 struct scsi_device *sdev = ERR_PTR(-ENODEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508 struct device *parent = &shost->shost_gendev;
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001509 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510
Matthew Wilcox938e2ac2007-01-15 18:07:09 -07001511 if (strncmp(scsi_scan_type, "none", 4) == 0)
1512 return ERR_PTR(-ENODEV);
1513
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001514 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515 if (!starget)
1516 return ERR_PTR(-ENOMEM);
1517
Arjan van de Ven0b950672006-01-11 13:16:10 +01001518 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001519 if (!shost->async_scan)
1520 scsi_complete_async_scans();
1521
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001522 if (scsi_host_scan_allowed(shost))
1523 scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001524 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525 scsi_target_reap(starget);
1526 put_device(&starget->dev);
1527
1528 return sdev;
1529}
1530EXPORT_SYMBOL(__scsi_add_device);
1531
James Bottomley146f7262005-09-10 12:44:09 -05001532int scsi_add_device(struct Scsi_Host *host, uint channel,
1533 uint target, uint lun)
1534{
1535 struct scsi_device *sdev =
1536 __scsi_add_device(host, channel, target, lun, NULL);
1537 if (IS_ERR(sdev))
1538 return PTR_ERR(sdev);
1539
1540 scsi_device_put(sdev);
1541 return 0;
1542}
1543EXPORT_SYMBOL(scsi_add_device);
1544
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545void scsi_rescan_device(struct device *dev)
1546{
1547 struct scsi_driver *drv;
1548
1549 if (!dev->driver)
1550 return;
1551
1552 drv = to_scsi_driver(dev->driver);
1553 if (try_module_get(drv->owner)) {
1554 if (drv->rescan)
1555 drv->rescan(dev);
1556 module_put(drv->owner);
1557 }
1558}
1559EXPORT_SYMBOL(scsi_rescan_device);
1560
Alan Sterne517d312005-07-26 10:18:45 -04001561static void __scsi_scan_target(struct device *parent, unsigned int channel,
1562 unsigned int id, unsigned int lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563{
1564 struct Scsi_Host *shost = dev_to_shost(parent);
1565 int bflags = 0;
1566 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567 struct scsi_target *starget;
1568
1569 if (shost->this_id == id)
1570 /*
1571 * Don't scan the host adapter
1572 */
1573 return;
1574
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 if (!starget)
1577 return;
1578
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579 if (lun != SCAN_WILD_CARD) {
1580 /*
1581 * Scan for a specific host/chan/id/lun.
1582 */
1583 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1584 goto out_reap;
1585 }
1586
1587 /*
1588 * Scan LUN 0, if there is some response, scan further. Ideally, we
1589 * would not configure LUN 0 until all LUNs are scanned.
1590 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001591 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1592 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1593 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001594 /*
1595 * The REPORT LUN did not scan the target,
1596 * do a sequential scan.
1597 */
1598 scsi_sequential_lun_scan(starget, bflags,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001599 starget->scsi_level, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001601
1602 out_reap:
1603 /* now determine if the target has any children at all
1604 * and if not, nuke it */
1605 scsi_target_reap(starget);
1606
1607 put_device(&starget->dev);
1608}
Alan Sterne517d312005-07-26 10:18:45 -04001609
1610/**
Randy Dunlape59e4a02008-02-29 22:02:50 -08001611 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
Alan Sterne517d312005-07-26 10:18:45 -04001612 * @parent: host to scan
1613 * @channel: channel to scan
1614 * @id: target id to scan
1615 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1616 * @rescan: passed to LUN scanning routines
1617 *
1618 * Description:
1619 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1620 * and possibly all LUNs on the target id.
1621 *
1622 * First try a REPORT LUN scan, if that does not scan the target, do a
1623 * sequential scan of LUNs on the target id.
1624 **/
1625void scsi_scan_target(struct device *parent, unsigned int channel,
1626 unsigned int id, unsigned int lun, int rescan)
1627{
1628 struct Scsi_Host *shost = dev_to_shost(parent);
1629
Matthew Wilcox93b45af2006-11-22 13:24:53 -07001630 if (strncmp(scsi_scan_type, "none", 4) == 0)
1631 return;
1632
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001633 mutex_lock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001634 if (!shost->async_scan)
1635 scsi_complete_async_scans();
1636
Alan Sterne517d312005-07-26 10:18:45 -04001637 if (scsi_host_scan_allowed(shost))
1638 __scsi_scan_target(parent, channel, id, lun, rescan);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001639 mutex_unlock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001640}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641EXPORT_SYMBOL(scsi_scan_target);
1642
1643static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1644 unsigned int id, unsigned int lun, int rescan)
1645{
1646 uint order_id;
1647
1648 if (id == SCAN_WILD_CARD)
1649 for (id = 0; id < shost->max_id; ++id) {
1650 /*
1651 * XXX adapter drivers when possible (FCP, iSCSI)
1652 * could modify max_id to match the current max,
1653 * not the absolute max.
1654 *
1655 * XXX add a shost id iterator, so for example,
1656 * the FC ID can be the same as a target id
1657 * without a huge overhead of sparse id's.
1658 */
1659 if (shost->reverse_ordering)
1660 /*
1661 * Scan from high to low id.
1662 */
1663 order_id = shost->max_id - id - 1;
1664 else
1665 order_id = id;
Alan Sterne517d312005-07-26 10:18:45 -04001666 __scsi_scan_target(&shost->shost_gendev, channel,
1667 order_id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668 }
1669 else
Alan Sterne517d312005-07-26 10:18:45 -04001670 __scsi_scan_target(&shost->shost_gendev, channel,
1671 id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001672}
1673
1674int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1675 unsigned int id, unsigned int lun, int rescan)
1676{
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001677 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
1678 "%s: <%u:%u:%u>\n",
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001679 __func__, channel, id, lun));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001680
1681 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
Amit Arora091686d2006-05-19 16:14:50 -07001682 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1684 return -EINVAL;
1685
Arjan van de Ven0b950672006-01-11 13:16:10 +01001686 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001687 if (!shost->async_scan)
1688 scsi_complete_async_scans();
1689
Mike Anderson82f29462005-06-16 11:14:33 -07001690 if (scsi_host_scan_allowed(shost)) {
1691 if (channel == SCAN_WILD_CARD)
1692 for (channel = 0; channel <= shost->max_channel;
1693 channel++)
1694 scsi_scan_channel(shost, channel, id, lun,
1695 rescan);
1696 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697 scsi_scan_channel(shost, channel, id, lun, rescan);
Mike Anderson82f29462005-06-16 11:14:33 -07001698 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001699 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700
1701 return 0;
1702}
1703
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001704static void scsi_sysfs_add_devices(struct Scsi_Host *shost)
1705{
1706 struct scsi_device *sdev;
1707 shost_for_each_device(sdev, shost) {
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001708 if (!scsi_host_scan_allowed(shost) ||
1709 scsi_sysfs_add_sdev(sdev) != 0)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001710 scsi_destroy_sdev(sdev);
1711 }
1712}
1713
1714/**
1715 * scsi_prep_async_scan - prepare for an async scan
1716 * @shost: the host which will be scanned
1717 * Returns: a cookie to be passed to scsi_finish_async_scan()
1718 *
1719 * Tells the midlayer this host is going to do an asynchronous scan.
1720 * It reserves the host's position in the scanning list and ensures
1721 * that other asynchronous scans started after this one won't affect the
1722 * ordering of the discovered devices.
1723 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001724static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001725{
1726 struct async_scan_data *data;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001727 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001728
1729 if (strncmp(scsi_scan_type, "sync", 4) == 0)
1730 return NULL;
1731
1732 if (shost->async_scan) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001733 printk("%s called twice for host %d", __func__,
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001734 shost->host_no);
1735 dump_stack();
1736 return NULL;
1737 }
1738
1739 data = kmalloc(sizeof(*data), GFP_KERNEL);
1740 if (!data)
1741 goto err;
1742 data->shost = scsi_host_get(shost);
1743 if (!data->shost)
1744 goto err;
1745 init_completion(&data->prev_finished);
1746
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001747 mutex_lock(&shost->scan_mutex);
1748 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001749 shost->async_scan = 1;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001750 spin_unlock_irqrestore(shost->host_lock, flags);
1751 mutex_unlock(&shost->scan_mutex);
1752
1753 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001754 if (list_empty(&scanning_hosts))
1755 complete(&data->prev_finished);
1756 list_add_tail(&data->list, &scanning_hosts);
1757 spin_unlock(&async_scan_lock);
1758
1759 return data;
1760
1761 err:
1762 kfree(data);
1763 return NULL;
1764}
1765
1766/**
1767 * scsi_finish_async_scan - asynchronous scan has finished
1768 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1769 *
1770 * All the devices currently attached to this host have been found.
1771 * This function announces all the devices it has found to the rest
1772 * of the system.
1773 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001774static void scsi_finish_async_scan(struct async_scan_data *data)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001775{
1776 struct Scsi_Host *shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001777 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001778
1779 if (!data)
1780 return;
1781
1782 shost = data->shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001783
1784 mutex_lock(&shost->scan_mutex);
1785
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001786 if (!shost->async_scan) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001787 printk("%s called twice for host %d", __func__,
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001788 shost->host_no);
1789 dump_stack();
Julia Lawall773e82f2008-07-21 09:58:30 +02001790 mutex_unlock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001791 return;
1792 }
1793
1794 wait_for_completion(&data->prev_finished);
1795
1796 scsi_sysfs_add_devices(shost);
1797
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001798 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001799 shost->async_scan = 0;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001800 spin_unlock_irqrestore(shost->host_lock, flags);
1801
1802 mutex_unlock(&shost->scan_mutex);
1803
1804 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001805 list_del(&data->list);
1806 if (!list_empty(&scanning_hosts)) {
1807 struct async_scan_data *next = list_entry(scanning_hosts.next,
1808 struct async_scan_data, list);
1809 complete(&next->prev_finished);
1810 }
1811 spin_unlock(&async_scan_lock);
1812
1813 scsi_host_put(shost);
1814 kfree(data);
1815}
1816
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001817static void do_scsi_scan_host(struct Scsi_Host *shost)
1818{
1819 if (shost->hostt->scan_finished) {
1820 unsigned long start = jiffies;
1821 if (shost->hostt->scan_start)
1822 shost->hostt->scan_start(shost);
1823
1824 while (!shost->hostt->scan_finished(shost, jiffies - start))
1825 msleep(10);
1826 } else {
1827 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1828 SCAN_WILD_CARD, 0);
1829 }
1830}
1831
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001832static int do_scan_async(void *_data)
1833{
1834 struct async_scan_data *data = _data;
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001835 do_scsi_scan_host(data->shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001836 scsi_finish_async_scan(data);
1837 return 0;
1838}
1839
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840/**
1841 * scsi_scan_host - scan the given adapter
1842 * @shost: adapter to scan
1843 **/
1844void scsi_scan_host(struct Scsi_Host *shost)
1845{
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001846 struct task_struct *p;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001847 struct async_scan_data *data;
1848
1849 if (strncmp(scsi_scan_type, "none", 4) == 0)
1850 return;
1851
1852 data = scsi_prep_async_scan(shost);
1853 if (!data) {
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001854 do_scsi_scan_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001855 return;
1856 }
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001857
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001858 p = kthread_run(do_scan_async, data, "scsi_scan_%d", shost->host_no);
Hirofumi Nakagawa801678c2008-04-29 01:03:09 -07001859 if (IS_ERR(p))
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001860 do_scan_async(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001861}
1862EXPORT_SYMBOL(scsi_scan_host);
1863
Linus Torvalds1da177e2005-04-16 15:20:36 -07001864void scsi_forget_host(struct Scsi_Host *shost)
1865{
Alan Sterna64358d2005-07-26 10:27:10 -04001866 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001867 unsigned long flags;
1868
Alan Sterna64358d2005-07-26 10:27:10 -04001869 restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001870 spin_lock_irqsave(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001871 list_for_each_entry(sdev, &shost->__devices, siblings) {
1872 if (sdev->sdev_state == SDEV_DEL)
1873 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001874 spin_unlock_irqrestore(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001875 __scsi_remove_device(sdev);
1876 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001877 }
1878 spin_unlock_irqrestore(shost->host_lock, flags);
1879}
1880
1881/*
1882 * Function: scsi_get_host_dev()
1883 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001884 * Purpose: Create a scsi_device that points to the host adapter itself.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001886 * Arguments: SHpnt - Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887 *
1888 * Lock status: None assumed.
1889 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001890 * Returns: The scsi_device or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001891 *
1892 * Notes:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001893 * Attach a single scsi_device to the Scsi_Host - this should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894 * be made to look like a "pseudo-device" that points to the
1895 * HA itself.
1896 *
1897 * Note - this device is not accessible from any high-level
1898 * drivers (including generics), which is probably not
1899 * optimal. We can add hooks later to attach
1900 */
1901struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1902{
Alan Sterne517d312005-07-26 10:18:45 -04001903 struct scsi_device *sdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904 struct scsi_target *starget;
1905
Arjan van de Ven0b950672006-01-11 13:16:10 +01001906 mutex_lock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001907 if (!scsi_host_scan_allowed(shost))
1908 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1910 if (!starget)
Alan Sterne517d312005-07-26 10:18:45 -04001911 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001912
1913 sdev = scsi_alloc_sdev(starget, 0, NULL);
1914 if (sdev) {
1915 sdev->sdev_gendev.parent = get_device(&starget->dev);
1916 sdev->borken = 0;
James Bottomley884d25c2006-09-05 16:26:41 -05001917 } else
1918 scsi_target_reap(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919 put_device(&starget->dev);
Alan Sterne517d312005-07-26 10:18:45 -04001920 out:
Arjan van de Ven0b950672006-01-11 13:16:10 +01001921 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922 return sdev;
1923}
1924EXPORT_SYMBOL(scsi_get_host_dev);
1925
1926/*
1927 * Function: scsi_free_host_dev()
1928 *
1929 * Purpose: Free a scsi_device that points to the host adapter itself.
1930 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001931 * Arguments: SHpnt - Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932 *
1933 * Lock status: None assumed.
1934 *
1935 * Returns: Nothing
1936 *
1937 * Notes:
1938 */
1939void scsi_free_host_dev(struct scsi_device *sdev)
1940{
1941 BUG_ON(sdev->id != sdev->host->this_id);
1942
James Bottomley6f3a2022005-09-22 20:33:28 -05001943 scsi_destroy_sdev(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944}
1945EXPORT_SYMBOL(scsi_free_host_dev);
1946