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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * scsi_scan.c
3 *
4 * Copyright (C) 2000 Eric Youngdale,
5 * Copyright (C) 2002 Patrick Mansfield
6 *
7 * The general scanning/probing algorithm is as follows, exceptions are
8 * made to it depending on device specific flags, compilation options, and
9 * global variable (boot or module load time) settings.
10 *
11 * A specific LUN is scanned via an INQUIRY command; if the LUN has a
Christoph Hellwigf64a1812005-10-31 18:32:08 +010012 * device attached, a scsi_device is allocated and setup for it.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
14 * For every id of every channel on the given host:
15 *
16 * Scan LUN 0; if the target responds to LUN 0 (even if there is no
17 * device or storage attached to LUN 0):
18 *
19 * If LUN 0 has a device attached, allocate and setup a
Christoph Hellwigf64a1812005-10-31 18:32:08 +010020 * scsi_device for it.
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 *
22 * If target is SCSI-3 or up, issue a REPORT LUN, and scan
23 * all of the LUNs returned by the REPORT LUN; else,
24 * sequentially scan LUNs up until some maximum is reached,
25 * or a LUN is seen that cannot have a device attached to it.
26 */
27
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36#include <scsi/scsi.h>
Christoph Hellwigbeb40482006-06-10 18:01:03 +020037#include <scsi/scsi_cmnd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <scsi/scsi_device.h>
39#include <scsi/scsi_driver.h>
40#include <scsi/scsi_devinfo.h>
41#include <scsi/scsi_host.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <scsi/scsi_transport.h>
43#include <scsi/scsi_eh.h>
44
45#include "scsi_priv.h"
46#include "scsi_logging.h"
47
48#define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
49 " SCSI scanning, some SCSI devices might not be configured\n"
50
51/*
52 * Default timeout
53 */
54#define SCSI_TIMEOUT (2*HZ)
55
56/*
Robert P. J. Day405ae7d2007-02-17 19:13:42 +010057 * Prefix values for the SCSI id's (stored in sysfs name field)
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 */
59#define SCSI_UID_SER_NUM 'S'
60#define SCSI_UID_UNKNOWN 'Z'
61
62/*
63 * Return values of some of the scanning functions.
64 *
65 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
66 * includes allocation or general failures preventing IO from being sent.
67 *
68 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
69 * on the given LUN.
70 *
71 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
72 * given LUN.
73 */
74#define SCSI_SCAN_NO_RESPONSE 0
75#define SCSI_SCAN_TARGET_PRESENT 1
76#define SCSI_SCAN_LUN_PRESENT 2
77
Arjan van de Ven0ad78202005-11-28 16:22:25 +010078static const char *scsi_null_device_strs = "nullnullnullnull";
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
80#define MAX_SCSI_LUNS 512
81
82#ifdef CONFIG_SCSI_MULTI_LUN
83static unsigned int max_scsi_luns = MAX_SCSI_LUNS;
84#else
85static unsigned int max_scsi_luns = 1;
86#endif
87
Masatake YAMATO10f4b892007-09-19 22:59:16 +090088module_param_named(max_luns, max_scsi_luns, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089MODULE_PARM_DESC(max_luns,
90 "last scsi LUN (should be between 1 and 2^32-1)");
91
Matthew Wilcox21db1882006-11-22 13:24:52 -070092#ifdef CONFIG_SCSI_SCAN_ASYNC
93#define SCSI_SCAN_TYPE_DEFAULT "async"
94#else
95#define SCSI_SCAN_TYPE_DEFAULT "sync"
96#endif
97
98static char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT;
Matthew Wilcox3e082a92006-09-28 15:19:20 -060099
100module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO);
101MODULE_PARM_DESC(scan, "sync, async or none");
102
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103/*
104 * max_scsi_report_luns: the maximum number of LUNS that will be
105 * returned from the REPORT LUNS command. 8 times this value must
106 * be allocated. In theory this could be up to an 8 byte value, but
107 * in practice, the maximum number of LUNs suppored by any device
108 * is about 16k.
109 */
110static unsigned int max_scsi_report_luns = 511;
111
Masatake YAMATO10f4b892007-09-19 22:59:16 +0900112module_param_named(max_report_luns, max_scsi_report_luns, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113MODULE_PARM_DESC(max_report_luns,
114 "REPORT LUNS maximum number of LUNS received (should be"
115 " between 1 and 16384)");
116
117static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+3;
118
Masatake YAMATO10f4b892007-09-19 22:59:16 +0900119module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120MODULE_PARM_DESC(inq_timeout,
121 "Timeout (in seconds) waiting for devices to answer INQUIRY."
122 " Default is 5. Some non-compliant devices need more.");
123
Matthew Wilcox6b7f1232007-06-26 15:18:51 -0600124/* This lock protects only this list */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600125static DEFINE_SPINLOCK(async_scan_lock);
126static LIST_HEAD(scanning_hosts);
127
128struct async_scan_data {
129 struct list_head list;
130 struct Scsi_Host *shost;
131 struct completion prev_finished;
132};
133
134/**
135 * scsi_complete_async_scans - Wait for asynchronous scans to complete
136 *
Matthew Wilcox8bcc2412006-12-07 19:29:27 -0700137 * When this function returns, any host which started scanning before
138 * this function was called will have finished its scan. Hosts which
139 * started scanning after this function was called may or may not have
140 * finished.
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600141 */
142int scsi_complete_async_scans(void)
143{
144 struct async_scan_data *data;
145
146 do {
147 if (list_empty(&scanning_hosts))
148 return 0;
149 /* If we can't get memory immediately, that's OK. Just
150 * sleep a little. Even if we never get memory, the async
151 * scans will finish eventually.
152 */
153 data = kmalloc(sizeof(*data), GFP_KERNEL);
154 if (!data)
155 msleep(1);
156 } while (!data);
157
158 data->shost = NULL;
159 init_completion(&data->prev_finished);
160
161 spin_lock(&async_scan_lock);
162 /* Check that there's still somebody else on the list */
163 if (list_empty(&scanning_hosts))
164 goto done;
165 list_add_tail(&data->list, &scanning_hosts);
166 spin_unlock(&async_scan_lock);
167
168 printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n");
169 wait_for_completion(&data->prev_finished);
170
171 spin_lock(&async_scan_lock);
172 list_del(&data->list);
Matthew Wilcox8bcc2412006-12-07 19:29:27 -0700173 if (!list_empty(&scanning_hosts)) {
174 struct async_scan_data *next = list_entry(scanning_hosts.next,
175 struct async_scan_data, list);
176 complete(&next->prev_finished);
177 }
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600178 done:
179 spin_unlock(&async_scan_lock);
180
181 kfree(data);
182 return 0;
183}
184
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600185/* Only exported for the benefit of scsi_wait_scan */
186EXPORT_SYMBOL_GPL(scsi_complete_async_scans);
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600187
Hugh Dickinsf2f027c2007-05-23 14:41:42 -0700188#ifndef MODULE
189/*
190 * For async scanning we need to wait for all the scans to complete before
191 * trying to mount the root fs. Otherwise non-modular drivers may not be ready
192 * yet.
193 */
194late_initcall(scsi_complete_async_scans);
195#endif
196
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197/**
198 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
James Bottomley39216032005-06-15 18:48:29 -0500199 * @sdev: scsi device to send command to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 * @result: area to store the result of the MODE SENSE
201 *
202 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500203 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 * Called for BLIST_KEY devices.
205 **/
James Bottomley39216032005-06-15 18:48:29 -0500206static void scsi_unlock_floptical(struct scsi_device *sdev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 unsigned char *result)
208{
209 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
210
211 printk(KERN_NOTICE "scsi: unlocking floptical drive\n");
212 scsi_cmd[0] = MODE_SENSE;
213 scsi_cmd[1] = 0;
214 scsi_cmd[2] = 0x2e;
215 scsi_cmd[3] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500216 scsi_cmd[4] = 0x2a; /* size */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 scsi_cmd[5] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500218 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
219 SCSI_TIMEOUT, 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220}
221
222/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 * scsi_alloc_sdev - allocate and setup a scsi_Device
Rob Landleyeb448202007-11-03 13:30:39 -0500224 * @starget: which target to allocate a &scsi_device for
225 * @lun: which lun
226 * @hostdata: usually NULL and set by ->slave_alloc instead
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 *
228 * Description:
229 * Allocate, initialize for io, and return a pointer to a scsi_Device.
230 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
231 * adds scsi_Device to the appropriate list.
232 *
233 * Return value:
234 * scsi_Device pointer, or NULL on failure.
235 **/
236static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
237 unsigned int lun, void *hostdata)
238{
239 struct scsi_device *sdev;
240 int display_failure_msg = 1, ret;
241 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
Jeff Garzika341cd02007-10-29 17:15:22 -0400242 extern void scsi_evt_thread(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243
Jes Sorensen24669f752006-01-16 10:31:18 -0500244 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 GFP_ATOMIC);
246 if (!sdev)
247 goto out;
248
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 sdev->vendor = scsi_null_device_strs;
250 sdev->model = scsi_null_device_strs;
251 sdev->rev = scsi_null_device_strs;
252 sdev->host = shost;
253 sdev->id = starget->id;
254 sdev->lun = lun;
255 sdev->channel = starget->channel;
256 sdev->sdev_state = SDEV_CREATED;
257 INIT_LIST_HEAD(&sdev->siblings);
258 INIT_LIST_HEAD(&sdev->same_target_siblings);
259 INIT_LIST_HEAD(&sdev->cmd_list);
260 INIT_LIST_HEAD(&sdev->starved_entry);
Jeff Garzika341cd02007-10-29 17:15:22 -0400261 INIT_LIST_HEAD(&sdev->event_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 spin_lock_init(&sdev->list_lock);
Jeff Garzika341cd02007-10-29 17:15:22 -0400263 INIT_WORK(&sdev->event_work, scsi_evt_thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
265 sdev->sdev_gendev.parent = get_device(&starget->dev);
266 sdev->sdev_target = starget;
267
268 /* usually NULL and set by ->slave_alloc instead */
269 sdev->hostdata = hostdata;
270
271 /* if the device needs this changing, it may do so in the
272 * slave_configure function */
273 sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
274
275 /*
276 * Some low level driver could use device->type
277 */
278 sdev->type = -1;
279
280 /*
281 * Assume that the device will have handshaking problems,
282 * and then fix this field later if it turns out it
283 * doesn't
284 */
285 sdev->borken = 1;
286
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 sdev->request_queue = scsi_alloc_queue(sdev);
288 if (!sdev->request_queue) {
289 /* release fn is set up in scsi_sysfs_device_initialise, so
290 * have to free and put manually here */
291 put_device(&starget->dev);
Dave Jones93f560892006-03-09 10:21:27 -0500292 kfree(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 goto out;
294 }
295
296 sdev->request_queue->queuedata = sdev;
297 scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
298
299 scsi_sysfs_device_initialize(sdev);
300
301 if (shost->hostt->slave_alloc) {
302 ret = shost->hostt->slave_alloc(sdev);
303 if (ret) {
304 /*
305 * if LLDD reports slave not present, don't clutter
306 * console with alloc failure messages
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 */
308 if (ret == -ENXIO)
309 display_failure_msg = 0;
310 goto out_device_destroy;
311 }
312 }
313
314 return sdev;
315
316out_device_destroy:
317 transport_destroy_device(&sdev->sdev_gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 put_device(&sdev->sdev_gendev);
319out:
320 if (display_failure_msg)
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700321 printk(ALLOC_FAILURE_MSG, __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 return NULL;
323}
324
James Bottomley643eb2d2008-03-22 22:42:27 -0500325static void scsi_target_destroy(struct scsi_target *starget)
326{
327 struct device *dev = &starget->dev;
328 struct Scsi_Host *shost = dev_to_shost(dev->parent);
329 unsigned long flags;
330
331 transport_destroy_device(dev);
332 spin_lock_irqsave(shost->host_lock, flags);
333 if (shost->hostt->target_destroy)
334 shost->hostt->target_destroy(starget);
335 list_del_init(&starget->siblings);
336 spin_unlock_irqrestore(shost->host_lock, flags);
337 put_device(dev);
338}
339
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340static void scsi_target_dev_release(struct device *dev)
341{
342 struct device *parent = dev->parent;
343 struct scsi_target *starget = to_scsi_target(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500344
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 kfree(starget);
346 put_device(parent);
347}
348
Adrian Bunk453cd0f2008-07-03 23:47:33 -0700349static struct device_type scsi_target_type = {
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100350 .name = "scsi_target",
351 .release = scsi_target_dev_release,
352};
353
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354int scsi_is_target_device(const struct device *dev)
355{
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100356 return dev->type == &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357}
358EXPORT_SYMBOL(scsi_is_target_device);
359
360static struct scsi_target *__scsi_find_target(struct device *parent,
361 int channel, uint id)
362{
363 struct scsi_target *starget, *found_starget = NULL;
364 struct Scsi_Host *shost = dev_to_shost(parent);
365 /*
366 * Search for an existing target for this sdev.
367 */
368 list_for_each_entry(starget, &shost->__targets, siblings) {
369 if (starget->id == id &&
370 starget->channel == channel) {
371 found_starget = starget;
372 break;
373 }
374 }
375 if (found_starget)
376 get_device(&found_starget->dev);
377
378 return found_starget;
379}
380
James Bottomley884d25c2006-09-05 16:26:41 -0500381/**
382 * scsi_alloc_target - allocate a new or find an existing target
383 * @parent: parent of the target (need not be a scsi host)
384 * @channel: target channel number (zero if no channels)
385 * @id: target id number
386 *
387 * Return an existing target if one exists, provided it hasn't already
388 * gone into STARGET_DEL state, otherwise allocate a new target.
389 *
390 * The target is returned with an incremented reference, so the caller
391 * is responsible for both reaping and doing a last put
392 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393static struct scsi_target *scsi_alloc_target(struct device *parent,
394 int channel, uint id)
395{
396 struct Scsi_Host *shost = dev_to_shost(parent);
397 struct device *dev = NULL;
398 unsigned long flags;
399 const int size = sizeof(struct scsi_target)
400 + shost->transportt->target_size;
James.Smart@Emulex.Com5c44cd22005-06-10 22:24:30 -0400401 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 struct scsi_target *found_target;
Brian King32f95792006-02-22 14:28:24 -0600403 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
Jes Sorensen24669f752006-01-16 10:31:18 -0500405 starget = kzalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 if (!starget) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700407 printk(KERN_ERR "%s: allocation failure\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 return NULL;
409 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 dev = &starget->dev;
411 device_initialize(dev);
412 starget->reap_ref = 1;
413 dev->parent = get_device(parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 sprintf(dev->bus_id, "target%d:%d:%d",
415 shost->host_no, channel, id);
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100416#ifndef CONFIG_SYSFS_DEPRECATED
417 dev->bus = &scsi_bus_type;
418#endif
419 dev->type = &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 starget->id = id;
421 starget->channel = channel;
Mike Christief0c0a372008-08-17 15:24:38 -0500422 starget->can_queue = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 INIT_LIST_HEAD(&starget->siblings);
424 INIT_LIST_HEAD(&starget->devices);
James Bottomley643eb2d2008-03-22 22:42:27 -0500425 starget->state = STARGET_CREATED;
Alan Stern7c9d6f12007-01-08 11:12:32 -0500426 starget->scsi_level = SCSI_2;
James Bottomleyffedb452006-02-23 14:27:18 -0600427 retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 spin_lock_irqsave(shost->host_lock, flags);
429
430 found_target = __scsi_find_target(parent, channel, id);
431 if (found_target)
432 goto found;
433
434 list_add_tail(&starget->siblings, &shost->__targets);
435 spin_unlock_irqrestore(shost->host_lock, flags);
436 /* allocate and add */
James Bottomleya283bd32005-05-24 12:06:38 -0500437 transport_setup_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500438 if (shost->hostt->target_alloc) {
Brian King32f95792006-02-22 14:28:24 -0600439 error = shost->hostt->target_alloc(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500440
441 if(error) {
442 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
443 /* don't want scsi_target_reap to do the final
444 * put because it will be under the host lock */
James Bottomley643eb2d2008-03-22 22:42:27 -0500445 scsi_target_destroy(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500446 return NULL;
447 }
448 }
James Bottomley884d25c2006-09-05 16:26:41 -0500449 get_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500450
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 return starget;
452
453 found:
454 found_target->reap_ref++;
455 spin_unlock_irqrestore(shost->host_lock, flags);
James Bottomleyffedb452006-02-23 14:27:18 -0600456 if (found_target->state != STARGET_DEL) {
James Bottomley884d25c2006-09-05 16:26:41 -0500457 put_device(parent);
James Bottomleyffedb452006-02-23 14:27:18 -0600458 kfree(starget);
459 return found_target;
460 }
461 /* Unfortunately, we found a dying target; need to
462 * wait until it's dead before we can get a new one */
463 put_device(&found_target->dev);
464 flush_scheduled_work();
465 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466}
467
David Howells65f27f32006-11-22 14:55:48 +0000468static void scsi_target_reap_usercontext(struct work_struct *work)
James Bottomley65110b22006-02-14 10:48:46 -0600469{
David Howells65f27f32006-11-22 14:55:48 +0000470 struct scsi_target *starget =
471 container_of(work, struct scsi_target, ew.work);
James Bottomley863a9302005-12-15 20:01:43 -0800472
James Bottomleyffedb452006-02-23 14:27:18 -0600473 transport_remove_device(&starget->dev);
474 device_del(&starget->dev);
James Bottomley643eb2d2008-03-22 22:42:27 -0500475 scsi_target_destroy(starget);
James Bottomley863a9302005-12-15 20:01:43 -0800476}
477
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478/**
479 * scsi_target_reap - check to see if target is in use and destroy if not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 * @starget: target to be checked
481 *
482 * This is used after removing a LUN or doing a last put of the target
483 * it checks atomically that nothing is using the target and removes
484 * it if so.
485 */
486void scsi_target_reap(struct scsi_target *starget)
487{
James Bottomleyffedb452006-02-23 14:27:18 -0600488 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
489 unsigned long flags;
James Bottomley643eb2d2008-03-22 22:42:27 -0500490 enum scsi_target_state state;
491 int empty;
James Bottomleyffedb452006-02-23 14:27:18 -0600492
493 spin_lock_irqsave(shost->host_lock, flags);
James Bottomley643eb2d2008-03-22 22:42:27 -0500494 state = starget->state;
495 empty = --starget->reap_ref == 0 &&
496 list_empty(&starget->devices) ? 1 : 0;
James Bottomleyffedb452006-02-23 14:27:18 -0600497 spin_unlock_irqrestore(shost->host_lock, flags);
498
James Bottomley643eb2d2008-03-22 22:42:27 -0500499 if (!empty)
500 return;
501
502 BUG_ON(state == STARGET_DEL);
503 starget->state = STARGET_DEL;
504 if (state == STARGET_CREATED)
505 scsi_target_destroy(starget);
506 else
507 execute_in_process_context(scsi_target_reap_usercontext,
508 &starget->ew);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509}
510
511/**
Alan Sterne5b3cd42006-08-21 15:53:25 -0400512 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
513 * @s: INQUIRY result string to sanitize
514 * @len: length of the string
515 *
516 * Description:
517 * The SCSI spec says that INQUIRY vendor, product, and revision
518 * strings must consist entirely of graphic ASCII characters,
519 * padded on the right with spaces. Since not all devices obey
520 * this rule, we will replace non-graphic or non-ASCII characters
521 * with spaces. Exception: a NUL character is interpreted as a
522 * string terminator, so all the following characters are set to
523 * spaces.
524 **/
525static void sanitize_inquiry_string(unsigned char *s, int len)
526{
527 int terminated = 0;
528
529 for (; len > 0; (--len, ++s)) {
530 if (*s == 0)
531 terminated = 1;
532 if (terminated || *s < 0x20 || *s > 0x7e)
533 *s = ' ';
534 }
535}
536
537/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
James Bottomley39216032005-06-15 18:48:29 -0500539 * @sdev: scsi_device to probe
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 * @inq_result: area to store the INQUIRY result
James Bottomley39216032005-06-15 18:48:29 -0500541 * @result_len: len of inq_result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 * @bflags: store any bflags found here
543 *
544 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500545 * Probe the lun associated with @req using a standard SCSI INQUIRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 *
James Bottomley39216032005-06-15 18:48:29 -0500547 * If the INQUIRY is successful, zero is returned and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100549 * are copied to the scsi_device any flags value is stored in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400551static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
James Bottomley39216032005-06-15 18:48:29 -0500552 int result_len, int *bflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
555 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
556 int response_len = 0;
James Bottomley39216032005-06-15 18:48:29 -0500557 int pass, count, result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 struct scsi_sense_hdr sshdr;
559
560 *bflags = 0;
561
562 /* Perform up to 3 passes. The first pass uses a conservative
563 * transfer length of 36 unless sdev->inquiry_len specifies a
564 * different value. */
565 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
566 try_inquiry_len = first_inquiry_len;
567 pass = 1;
568
569 next_pass:
James Bottomley9ccfc752005-10-02 11:45:08 -0500570 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
571 "scsi scan: INQUIRY pass %d length %d\n",
572 pass, try_inquiry_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
574 /* Each pass gets up to three chances to ignore Unit Attention */
575 for (count = 0; count < 3; ++count) {
576 memset(scsi_cmd, 0, 6);
577 scsi_cmd[0] = INQUIRY;
578 scsi_cmd[4] = (unsigned char) try_inquiry_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
580 memset(inq_result, 0, try_inquiry_len);
James Bottomley39216032005-06-15 18:48:29 -0500581
582 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -0500583 inq_result, try_inquiry_len, &sshdr,
James Bottomley39216032005-06-15 18:48:29 -0500584 HZ / 2 + HZ * scsi_inq_timeout, 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
586 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
587 "with code 0x%x\n",
James Bottomley39216032005-06-15 18:48:29 -0500588 result ? "failed" : "successful", result));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
James Bottomley39216032005-06-15 18:48:29 -0500590 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 /*
592 * not-ready to ready transition [asc/ascq=0x28/0x0]
593 * or power-on, reset [asc/ascq=0x29/0x0], continue.
594 * INQUIRY should not yield UNIT_ATTENTION
595 * but many buggy devices do so anyway.
596 */
James Bottomley39216032005-06-15 18:48:29 -0500597 if ((driver_byte(result) & DRIVER_SENSE) &&
James Bottomleyea73a9f2005-08-28 11:33:52 -0500598 scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 if ((sshdr.sense_key == UNIT_ATTENTION) &&
600 ((sshdr.asc == 0x28) ||
601 (sshdr.asc == 0x29)) &&
602 (sshdr.ascq == 0))
603 continue;
604 }
605 }
606 break;
607 }
608
James Bottomley39216032005-06-15 18:48:29 -0500609 if (result == 0) {
Alan Sterne5b3cd42006-08-21 15:53:25 -0400610 sanitize_inquiry_string(&inq_result[8], 8);
611 sanitize_inquiry_string(&inq_result[16], 16);
612 sanitize_inquiry_string(&inq_result[32], 4);
613
614 response_len = inq_result[4] + 5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 if (response_len > 255)
616 response_len = first_inquiry_len; /* sanity */
617
618 /*
619 * Get any flags for this device.
620 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100621 * XXX add a bflags to scsi_device, and replace the
622 * corresponding bit fields in scsi_device, so bflags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 * need not be passed as an argument.
624 */
625 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
626 &inq_result[16]);
627
628 /* When the first pass succeeds we gain information about
629 * what larger transfer lengths might work. */
630 if (pass == 1) {
631 if (BLIST_INQUIRY_36 & *bflags)
632 next_inquiry_len = 36;
633 else if (BLIST_INQUIRY_58 & *bflags)
634 next_inquiry_len = 58;
635 else if (sdev->inquiry_len)
636 next_inquiry_len = sdev->inquiry_len;
637 else
638 next_inquiry_len = response_len;
639
640 /* If more data is available perform the second pass */
641 if (next_inquiry_len > try_inquiry_len) {
642 try_inquiry_len = next_inquiry_len;
643 pass = 2;
644 goto next_pass;
645 }
646 }
647
648 } else if (pass == 2) {
649 printk(KERN_INFO "scsi scan: %d byte inquiry failed. "
650 "Consider BLIST_INQUIRY_36 for this device\n",
651 try_inquiry_len);
652
653 /* If this pass failed, the third pass goes back and transfers
654 * the same amount as we successfully got in the first pass. */
655 try_inquiry_len = first_inquiry_len;
656 pass = 3;
657 goto next_pass;
658 }
659
660 /* If the last transfer attempt got an error, assume the
661 * peripheral doesn't exist or is dead. */
James Bottomley39216032005-06-15 18:48:29 -0500662 if (result)
663 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664
665 /* Don't report any more data than the device says is valid */
666 sdev->inquiry_len = min(try_inquiry_len, response_len);
667
668 /*
669 * XXX Abort if the response length is less than 36? If less than
670 * 32, the lookup of the device flags (above) could be invalid,
671 * and it would be possible to take an incorrect action - we do
672 * not want to hang because of a short INQUIRY. On the flip side,
673 * if the device is spun down or becoming ready (and so it gives a
674 * short INQUIRY), an abort here prevents any further use of the
675 * device, including spin up.
676 *
Alan Sterne423ee32007-02-16 01:46:38 -0800677 * On the whole, the best approach seems to be to assume the first
678 * 36 bytes are valid no matter what the device says. That's
679 * better than copying < 36 bytes to the inquiry-result buffer
680 * and displaying garbage for the Vendor, Product, or Revision
681 * strings.
682 */
683 if (sdev->inquiry_len < 36) {
684 printk(KERN_INFO "scsi scan: INQUIRY result too short (%d),"
685 " using 36\n", sdev->inquiry_len);
686 sdev->inquiry_len = 36;
687 }
688
689 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 * Related to the above issue:
691 *
692 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
693 * and if not ready, sent a START_STOP to start (maybe spin up) and
694 * then send the INQUIRY again, since the INQUIRY can change after
695 * a device is initialized.
696 *
697 * Ideally, start a device if explicitly asked to do so. This
698 * assumes that a device is spun up on power on, spun down on
699 * request, and then spun up on request.
700 */
701
702 /*
703 * The scanning code needs to know the scsi_level, even if no
704 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
705 * non-zero LUNs can be scanned.
706 */
707 sdev->scsi_level = inq_result[2] & 0x07;
708 if (sdev->scsi_level >= 2 ||
709 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
710 sdev->scsi_level++;
James Bottomley6f3a2022005-09-22 20:33:28 -0500711 sdev->sdev_target->scsi_level = sdev->scsi_level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712
James Bottomley39216032005-06-15 18:48:29 -0500713 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714}
715
716/**
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100717 * scsi_add_lun - allocate and fully initialze a scsi_device
Matthew Wilcox6d877682007-07-11 12:54:55 -0600718 * @sdev: holds information to be stored in the new scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 * @inq_result: holds the result of a previous INQUIRY to the LUN
720 * @bflags: black/white list flag
Matthew Wilcox6d877682007-07-11 12:54:55 -0600721 * @async: 1 if this device is being scanned asynchronously
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 *
723 * Description:
Matthew Wilcox6d877682007-07-11 12:54:55 -0600724 * Initialize the scsi_device @sdev. Optionally set fields based
725 * on values in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 *
727 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100728 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
729 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400731static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600732 int *bflags, int async)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733{
James Bottomley6f4267e2008-08-22 16:53:31 -0500734 int ret;
735
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 /*
737 * XXX do not save the inquiry, since it can change underneath us,
738 * save just vendor/model/rev.
739 *
740 * Rather than save it and have an ioctl that retrieves the saved
741 * value, have an ioctl that executes the same INQUIRY code used
742 * in scsi_probe_lun, let user level programs doing INQUIRY
743 * scanning run at their own risk, or supply a user level program
744 * that can correctly scan.
745 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746
Alan Stern09123d22006-11-10 12:27:57 -0800747 /*
748 * Copy at least 36 bytes of INQUIRY data, so that we don't
749 * dereference unallocated memory when accessing the Vendor,
750 * Product, and Revision strings. Badly behaved devices may set
751 * the INQUIRY Additional Length byte to a small value, indicating
752 * these strings are invalid, but often they contain plausible data
753 * nonetheless. It doesn't matter if the device sent < 36 bytes
754 * total, since scsi_probe_lun() initializes inq_result with 0s.
755 */
756 sdev->inquiry = kmemdup(inq_result,
757 max_t(size_t, sdev->inquiry_len, 36),
758 GFP_ATOMIC);
759 if (sdev->inquiry == NULL)
760 return SCSI_SCAN_NO_RESPONSE;
761
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 sdev->vendor = (char *) (sdev->inquiry + 8);
763 sdev->model = (char *) (sdev->inquiry + 16);
764 sdev->rev = (char *) (sdev->inquiry + 32);
765
766 if (*bflags & BLIST_ISROM) {
Matthew Wilcox6d877682007-07-11 12:54:55 -0600767 sdev->type = TYPE_ROM;
768 sdev->removable = 1;
769 } else {
770 sdev->type = (inq_result[0] & 0x1f);
771 sdev->removable = (inq_result[1] & 0x80) >> 7;
772 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773
Matthew Wilcox6d877682007-07-11 12:54:55 -0600774 switch (sdev->type) {
James Bottomleyddaf6fc2006-12-13 10:10:40 -0600775 case TYPE_RBC:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 case TYPE_TAPE:
777 case TYPE_DISK:
778 case TYPE_PRINTER:
779 case TYPE_MOD:
780 case TYPE_PROCESSOR:
781 case TYPE_SCANNER:
782 case TYPE_MEDIUM_CHANGER:
783 case TYPE_ENCLOSURE:
784 case TYPE_COMM:
James Bottomley4d7db042006-03-31 20:07:45 -0600785 case TYPE_RAID:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 sdev->writeable = 1;
787 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 case TYPE_ROM:
James Bottomleyddaf6fc2006-12-13 10:10:40 -0600789 case TYPE_WORM:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 sdev->writeable = 0;
791 break;
792 default:
793 printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type);
794 }
795
Matthew Wilcox6d877682007-07-11 12:54:55 -0600796 if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {
797 /* RBC and MMC devices can return SCSI-3 compliance and yet
798 * still not support REPORT LUNS, so make them act as
799 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
800 * specifically set */
801 if ((*bflags & BLIST_REPORTLUN2) == 0)
802 *bflags |= BLIST_NOREPORTLUN;
803 }
804
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 /*
806 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
807 * spec says: The device server is capable of supporting the
808 * specified peripheral device type on this logical unit. However,
809 * the physical device is not currently connected to this logical
810 * unit.
811 *
812 * The above is vague, as it implies that we could treat 001 and
813 * 011 the same. Stay compatible with previous code, and create a
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100814 * scsi_device for a PQ of 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 *
816 * Don't set the device offline here; rather let the upper
817 * level drivers eval the PQ to decide whether they should
818 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
819 */
820
821 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 sdev->lockable = sdev->removable;
823 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
824
Matthew Wilcox6d877682007-07-11 12:54:55 -0600825 if (sdev->scsi_level >= SCSI_3 ||
826 (sdev->inquiry_len > 56 && inq_result[56] & 0x04))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 sdev->ppr = 1;
828 if (inq_result[7] & 0x60)
829 sdev->wdtr = 1;
830 if (inq_result[7] & 0x10)
831 sdev->sdtr = 1;
832
James Bottomley19ac0db2006-08-06 18:15:22 -0500833 sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d "
Matthew Wilcox4ff36712006-07-04 12:15:20 -0600834 "ANSI: %d%s\n", scsi_device_type(sdev->type),
835 sdev->vendor, sdev->model, sdev->rev,
836 sdev->inq_periph_qual, inq_result[2] & 0x07,
837 (inq_result[3] & 0x0f) == 1 ? " CCS" : "");
838
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
840 !(*bflags & BLIST_NOTQ))
841 sdev->tagged_supported = 1;
Matthew Wilcox6d877682007-07-11 12:54:55 -0600842
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 /*
844 * Some devices (Texel CD ROM drives) have handshaking problems
845 * when used with the Seagate controllers. borken is initialized
846 * to 1, and then set it to 0 here.
847 */
848 if ((*bflags & BLIST_BORKEN) == 0)
849 sdev->borken = 0;
850
Matthew Wilcox6d877682007-07-11 12:54:55 -0600851 if (*bflags & BLIST_NO_ULD_ATTACH)
852 sdev->no_uld_attach = 1;
853
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 /*
855 * Apparently some really broken devices (contrary to the SCSI
856 * standards) need to be selected without asserting ATN
857 */
858 if (*bflags & BLIST_SELECT_NO_ATN)
859 sdev->select_no_atn = 1;
860
861 /*
James Bottomley4d7db042006-03-31 20:07:45 -0600862 * Maximum 512 sector transfer length
863 * broken RA4x00 Compaq Disk Array
864 */
865 if (*bflags & BLIST_MAX_512)
866 blk_queue_max_sectors(sdev->request_queue, 512);
867
868 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 * Some devices may not want to have a start command automatically
870 * issued when a device is added.
871 */
872 if (*bflags & BLIST_NOSTARTONADD)
873 sdev->no_start_on_add = 1;
874
875 if (*bflags & BLIST_SINGLELUN)
Tony Battersby25d7c362007-11-12 10:00:44 -0500876 scsi_target(sdev)->single_lun = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 sdev->use_10_for_rw = 1;
879
880 if (*bflags & BLIST_MS_SKIP_PAGE_08)
881 sdev->skip_ms_page_8 = 1;
882
883 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
884 sdev->skip_ms_page_3f = 1;
885
886 if (*bflags & BLIST_USE_10_BYTE_MS)
887 sdev->use_10_for_ms = 1;
888
889 /* set the device running here so that slave configure
890 * may do I/O */
James Bottomley6f4267e2008-08-22 16:53:31 -0500891 ret = scsi_device_set_state(sdev, SDEV_RUNNING);
892 if (ret) {
893 ret = scsi_device_set_state(sdev, SDEV_BLOCK);
894
895 if (ret) {
896 sdev_printk(KERN_ERR, sdev,
897 "in wrong state %s to complete scan\n",
898 scsi_device_state_name(sdev->sdev_state));
899 return SCSI_SCAN_NO_RESPONSE;
900 }
901 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902
903 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
904 sdev->use_192_bytes_for_3f = 1;
905
906 if (*bflags & BLIST_NOT_LOCKABLE)
907 sdev->lockable = 0;
908
909 if (*bflags & BLIST_RETRY_HWERROR)
910 sdev->retry_hwerror = 1;
911
912 transport_configure_device(&sdev->sdev_gendev);
913
Christoph Hellwig93805092006-02-17 12:11:29 +0100914 if (sdev->host->hostt->slave_configure) {
James Bottomley6f4267e2008-08-22 16:53:31 -0500915 ret = sdev->host->hostt->slave_configure(sdev);
Christoph Hellwig93805092006-02-17 12:11:29 +0100916 if (ret) {
917 /*
918 * if LLDD reports slave not present, don't clutter
919 * console with alloc failure messages
920 */
921 if (ret != -ENXIO) {
922 sdev_printk(KERN_ERR, sdev,
923 "failed to configure device\n");
924 }
925 return SCSI_SCAN_NO_RESPONSE;
926 }
927 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928
929 /*
930 * Ok, the device is now all set up, we can
931 * register it and tell the rest of the kernel
932 * about it.
933 */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600934 if (!async && scsi_sysfs_add_sdev(sdev) != 0)
Alan Sternb24b1032005-07-27 11:43:46 -0700935 return SCSI_SCAN_NO_RESPONSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936
937 return SCSI_SCAN_LUN_PRESENT;
938}
939
James Bottomley6f3a2022005-09-22 20:33:28 -0500940static inline void scsi_destroy_sdev(struct scsi_device *sdev)
941{
Brian King309bd272006-06-27 11:10:43 -0500942 scsi_device_set_state(sdev, SDEV_DEL);
James Bottomley6f3a2022005-09-22 20:33:28 -0500943 if (sdev->host->hostt->slave_destroy)
944 sdev->host->hostt->slave_destroy(sdev);
945 transport_destroy_device(&sdev->sdev_gendev);
946 put_device(&sdev->sdev_gendev);
947}
948
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700949#ifdef CONFIG_SCSI_LOGGING
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200950/**
Rob Landleyeb448202007-11-03 13:30:39 -0500951 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200952 * @buf: Output buffer with at least end-first+1 bytes of space
953 * @inq: Inquiry buffer (input)
954 * @first: Offset of string into inq
955 * @end: Index after last character in inq
956 */
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700957static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200958 unsigned first, unsigned end)
959{
960 unsigned term = 0, idx;
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700961
962 for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
963 if (inq[idx+first] > ' ') {
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200964 buf[idx] = inq[idx+first];
965 term = idx+1;
966 } else {
967 buf[idx] = ' ';
968 }
969 }
970 buf[term] = 0;
971 return buf;
972}
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700973#endif
James Bottomley6f3a2022005-09-22 20:33:28 -0500974
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975/**
976 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
977 * @starget: pointer to target device structure
978 * @lun: LUN of target device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 * @bflagsp: store bflags here if not NULL
Rob Landleyeb448202007-11-03 13:30:39 -0500980 * @sdevp: probe the LUN corresponding to this scsi_device
981 * @rescan: if nonzero skip some code only needed on first scan
982 * @hostdata: passed to scsi_alloc_sdev()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 *
984 * Description:
985 * Call scsi_probe_lun, if a LUN with an attached device is found,
986 * allocate and set it up by calling scsi_add_lun.
987 *
988 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100989 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
991 * attached at the LUN
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100992 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 **/
994static int scsi_probe_and_add_lun(struct scsi_target *starget,
995 uint lun, int *bflagsp,
996 struct scsi_device **sdevp, int rescan,
997 void *hostdata)
998{
999 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 unsigned char *result;
James Bottomley39216032005-06-15 18:48:29 -05001001 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1003
1004 /*
1005 * The rescan flag is used as an optimization, the first scan of a
1006 * host adapter calls into here with rescan == 0.
1007 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001008 sdev = scsi_device_lookup_by_target(starget, lun);
1009 if (sdev) {
James Bottomley0f1d87a2008-08-22 16:43:59 -05001010 if (rescan || !scsi_device_created(sdev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1012 "scsi scan: device exists on %s\n",
1013 sdev->sdev_gendev.bus_id));
1014 if (sdevp)
1015 *sdevp = sdev;
1016 else
1017 scsi_device_put(sdev);
1018
1019 if (bflagsp)
1020 *bflagsp = scsi_get_device_flags(sdev,
1021 sdev->vendor,
1022 sdev->model);
1023 return SCSI_SCAN_LUN_PRESENT;
1024 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001025 scsi_device_put(sdev);
1026 } else
1027 sdev = scsi_alloc_sdev(starget, lun, hostdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028 if (!sdev)
1029 goto out;
James Bottomley39216032005-06-15 18:48:29 -05001030
1031 result = kmalloc(result_len, GFP_ATOMIC |
Al Virobc861202005-04-24 12:28:34 -07001032 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 if (!result)
James Bottomley39216032005-06-15 18:48:29 -05001034 goto out_free_sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035
James Bottomley39216032005-06-15 18:48:29 -05001036 if (scsi_probe_lun(sdev, result, result_len, &bflags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 goto out_free_result;
1038
Kurt Garloff4186ab12006-04-03 15:16:48 +02001039 if (bflagsp)
1040 *bflagsp = bflags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 /*
1042 * result contains valid SCSI INQUIRY data.
1043 */
Kurt Garloff13f7e5a2006-04-03 15:20:08 +02001044 if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 /*
1046 * For a Peripheral qualifier 3 (011b), the SCSI
1047 * spec says: The device server is not capable of
1048 * supporting a physical device on this logical
1049 * unit.
1050 *
1051 * For disks, this implies that there is no
1052 * logical disk configured at sdev->lun, but there
1053 * is a target id responding.
1054 */
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001055 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
1056 " peripheral qualifier of 3, device not"
1057 " added\n"))
1058 if (lun == 0) {
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001059 SCSI_LOG_SCAN_BUS(1, {
1060 unsigned char vend[9];
1061 unsigned char mod[17];
1062
1063 sdev_printk(KERN_INFO, sdev,
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001064 "scsi scan: consider passing scsi_mod."
Kurt Garloff3424a652007-01-09 02:28:54 +01001065 "dev_flags=%s:%s:0x240 or 0x1000240\n",
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001066 scsi_inq_str(vend, result, 8, 16),
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001067 scsi_inq_str(mod, result, 16, 32));
1068 });
James Bottomley643eb2d2008-03-22 22:42:27 -05001069
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001070 }
James Bottomley643eb2d2008-03-22 22:42:27 -05001071
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 res = SCSI_SCAN_TARGET_PRESENT;
1073 goto out_free_result;
1074 }
1075
Alan Stern1bfc5d92006-02-09 15:26:18 -05001076 /*
dave wysochanski84961f22006-08-09 14:56:32 -04001077 * Some targets may set slight variations of PQ and PDT to signal
1078 * that no LUN is present, so don't add sdev in these cases.
1079 * Two specific examples are:
1080 * 1) NetApp targets: return PQ=1, PDT=0x1f
1081 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1082 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1083 *
1084 * References:
1085 * 1) SCSI SPC-3, pp. 145-146
1086 * PQ=1: "A peripheral device having the specified peripheral
1087 * device type is not connected to this logical unit. However, the
1088 * device server is capable of supporting the specified peripheral
1089 * device type on this logical unit."
1090 * PDT=0x1f: "Unknown or no device type"
1091 * 2) USB UFI 1.0, p. 20
1092 * PDT=00h Direct-access device (floppy)
1093 * PDT=1Fh none (no FDD connected to the requested logical unit)
Alan Stern1bfc5d92006-02-09 15:26:18 -05001094 */
dave wysochanski84961f22006-08-09 14:56:32 -04001095 if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) &&
James Bottomley01b291b2008-08-21 15:14:14 -05001096 (result[0] & 0x1f) == 0x1f &&
1097 !scsi_is_wlun(lun)) {
Alan Stern1bfc5d92006-02-09 15:26:18 -05001098 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1099 "scsi scan: peripheral device type"
1100 " of 31, no device added\n"));
1101 res = SCSI_SCAN_TARGET_PRESENT;
1102 goto out_free_result;
1103 }
1104
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001105 res = scsi_add_lun(sdev, result, &bflags, shost->async_scan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 if (res == SCSI_SCAN_LUN_PRESENT) {
1107 if (bflags & BLIST_KEY) {
1108 sdev->lockable = 0;
James Bottomley39216032005-06-15 18:48:29 -05001109 scsi_unlock_floptical(sdev, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 }
1112
1113 out_free_result:
1114 kfree(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 out_free_sdev:
1116 if (res == SCSI_SCAN_LUN_PRESENT) {
1117 if (sdevp) {
Alan Sternb70d37b2005-07-26 10:30:40 -04001118 if (scsi_device_get(sdev) == 0) {
1119 *sdevp = sdev;
1120 } else {
1121 __scsi_remove_device(sdev);
1122 res = SCSI_SCAN_NO_RESPONSE;
1123 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001125 } else
1126 scsi_destroy_sdev(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 out:
1128 return res;
1129}
1130
1131/**
1132 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1133 * @starget: pointer to target structure to scan
1134 * @bflags: black/white list flag for LUN 0
Rob Landleyeb448202007-11-03 13:30:39 -05001135 * @scsi_level: Which version of the standard does this device adhere to
1136 * @rescan: passed to scsi_probe_add_lun()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 *
1138 * Description:
1139 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1140 * scanned) to some maximum lun until a LUN is found with no device
1141 * attached. Use the bflags to figure out any oddities.
1142 *
1143 * Modifies sdevscan->lun.
1144 **/
1145static void scsi_sequential_lun_scan(struct scsi_target *starget,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001146 int bflags, int scsi_level, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147{
1148 unsigned int sparse_lun, lun, max_dev_lun;
1149 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1150
1151 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of"
1152 "%s\n", starget->dev.bus_id));
1153
1154 max_dev_lun = min(max_scsi_luns, shost->max_lun);
1155 /*
1156 * If this device is known to support sparse multiple units,
1157 * override the other settings, and scan all of them. Normally,
1158 * SCSI-3 devices should be scanned via the REPORT LUNS.
1159 */
1160 if (bflags & BLIST_SPARSELUN) {
1161 max_dev_lun = shost->max_lun;
1162 sparse_lun = 1;
1163 } else
1164 sparse_lun = 0;
1165
1166 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 * If less than SCSI_1_CSS, and no special lun scaning, stop
1168 * scanning; this matches 2.4 behaviour, but could just be a bug
1169 * (to continue scanning a SCSI_1_CSS device).
1170 *
1171 * This test is broken. We might not have any device on lun0 for
1172 * a sparselun device, and if that's the case then how would we
1173 * know the real scsi_level, eh? It might make sense to just not
1174 * scan any SCSI_1 device for non-0 luns, but that check would best
1175 * go into scsi_alloc_sdev() and just have it return null when asked
1176 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1177 *
1178 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1179 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1180 == 0))
1181 return;
1182 */
1183 /*
1184 * If this device is known to support multiple units, override
1185 * the other settings, and scan all of them.
1186 */
1187 if (bflags & BLIST_FORCELUN)
1188 max_dev_lun = shost->max_lun;
1189 /*
1190 * REGAL CDC-4X: avoid hang after LUN 4
1191 */
1192 if (bflags & BLIST_MAX5LUN)
1193 max_dev_lun = min(5U, max_dev_lun);
1194 /*
1195 * Do not scan SCSI-2 or lower device past LUN 7, unless
1196 * BLIST_LARGELUN.
1197 */
1198 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
1199 max_dev_lun = min(8U, max_dev_lun);
1200
1201 /*
1202 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1203 * until we reach the max, or no LUN is found and we are not
1204 * sparse_lun.
1205 */
1206 for (lun = 1; lun < max_dev_lun; ++lun)
1207 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
1208 NULL) != SCSI_SCAN_LUN_PRESENT) &&
1209 !sparse_lun)
1210 return;
1211}
1212
1213/**
1214 * scsilun_to_int: convert a scsi_lun to an int
1215 * @scsilun: struct scsi_lun to be converted.
1216 *
1217 * Description:
1218 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1219 * integer, and return the result. The caller must check for
1220 * truncation before using this function.
1221 *
1222 * Notes:
1223 * The struct scsi_lun is assumed to be four levels, with each level
1224 * effectively containing a SCSI byte-ordered (big endian) short; the
1225 * addressing bits of each level are ignored (the highest two bits).
1226 * For a description of the LUN format, post SCSI-3 see the SCSI
1227 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1228 *
1229 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1230 * the integer: 0x0b030a04
1231 **/
Christof Schmitt462b7852007-06-19 10:25:30 +02001232int scsilun_to_int(struct scsi_lun *scsilun)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233{
1234 int i;
1235 unsigned int lun;
1236
1237 lun = 0;
1238 for (i = 0; i < sizeof(lun); i += 2)
1239 lun = lun | (((scsilun->scsi_lun[i] << 8) |
1240 scsilun->scsi_lun[i + 1]) << (i * 8));
1241 return lun;
1242}
Christof Schmitt462b7852007-06-19 10:25:30 +02001243EXPORT_SYMBOL(scsilun_to_int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244
1245/**
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001246 * int_to_scsilun: reverts an int into a scsi_lun
Rob Landleyeb448202007-11-03 13:30:39 -05001247 * @lun: integer to be reverted
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001248 * @scsilun: struct scsi_lun to be set.
1249 *
1250 * Description:
1251 * Reverts the functionality of the scsilun_to_int, which packed
1252 * an 8-byte lun value into an int. This routine unpacks the int
1253 * back into the lun value.
1254 * Note: the scsilun_to_int() routine does not truly handle all
1255 * 8bytes of the lun value. This functions restores only as much
1256 * as was set by the routine.
1257 *
1258 * Notes:
1259 * Given an integer : 0x0b030a04, this function returns a
1260 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1261 *
1262 **/
1263void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun)
1264{
1265 int i;
1266
1267 memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
1268
1269 for (i = 0; i < sizeof(lun); i += 2) {
1270 scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
1271 scsilun->scsi_lun[i+1] = lun & 0xFF;
1272 lun = lun >> 16;
1273 }
1274}
1275EXPORT_SYMBOL(int_to_scsilun);
1276
1277/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
Rob Landleyeb448202007-11-03 13:30:39 -05001279 * @starget: which target
1280 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1281 * @rescan: nonzero if we can skip code only needed on first scan
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282 *
1283 * Description:
Rob Landleyeb448202007-11-03 13:30:39 -05001284 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1285 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 *
Rob Landleyeb448202007-11-03 13:30:39 -05001287 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1288 * LUNs even if it's older than SCSI-3.
1289 * If BLIST_NOREPORTLUN is set, return 1 always.
1290 * If BLIST_NOLUN is set, return 0 always.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291 *
1292 * Return:
1293 * 0: scan completed (or no memory, so further scanning is futile)
Rob Landleyeb448202007-11-03 13:30:39 -05001294 * 1: could not scan with REPORT LUN
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 **/
James Bottomley6f3a2022005-09-22 20:33:28 -05001296static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297 int rescan)
1298{
1299 char devname[64];
1300 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1301 unsigned int length;
1302 unsigned int lun;
1303 unsigned int num_luns;
1304 unsigned int retries;
James Bottomley39216032005-06-15 18:48:29 -05001305 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 struct scsi_lun *lunp, *lun_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 u8 *data;
1308 struct scsi_sense_hdr sshdr;
James Bottomley6f3a2022005-09-22 20:33:28 -05001309 struct scsi_device *sdev;
1310 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
Alan Stern2ef89192005-11-08 15:51:55 -05001311 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312
1313 /*
1314 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1315 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1316 * support more than 8 LUNs.
1317 */
James Bottomley4d7db042006-03-31 20:07:45 -06001318 if (bflags & BLIST_NOREPORTLUN)
1319 return 1;
1320 if (starget->scsi_level < SCSI_2 &&
1321 starget->scsi_level != SCSI_UNKNOWN)
1322 return 1;
1323 if (starget->scsi_level < SCSI_3 &&
1324 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 return 1;
1326 if (bflags & BLIST_NOLUN)
1327 return 0;
1328
James Bottomley6f3a2022005-09-22 20:33:28 -05001329 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1330 sdev = scsi_alloc_sdev(starget, 0, NULL);
1331 if (!sdev)
1332 return 0;
1333 if (scsi_device_get(sdev))
1334 return 0;
1335 }
1336
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 sprintf(devname, "host %d channel %d id %d",
James Bottomley6f3a2022005-09-22 20:33:28 -05001338 shost->host_no, sdev->channel, sdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339
1340 /*
1341 * Allocate enough to hold the header (the same size as one scsi_lun)
1342 * plus the max number of luns we are requesting.
1343 *
1344 * Reallocating and trying again (with the exact amount we need)
1345 * would be nice, but then we need to somehow limit the size
1346 * allocated based on the available memory and the limits of
1347 * kmalloc - we don't want a kmalloc() failure of a huge value to
1348 * prevent us from finding any LUNs on this target.
1349 */
1350 length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun);
1351 lun_data = kmalloc(length, GFP_ATOMIC |
1352 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
James Bottomley6f3a2022005-09-22 20:33:28 -05001353 if (!lun_data) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001354 printk(ALLOC_FAILURE_MSG, __func__);
James Bottomley39216032005-06-15 18:48:29 -05001355 goto out;
James Bottomley6f3a2022005-09-22 20:33:28 -05001356 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357
1358 scsi_cmd[0] = REPORT_LUNS;
1359
1360 /*
1361 * bytes 1 - 5: reserved, set to zero.
1362 */
1363 memset(&scsi_cmd[1], 0, 5);
1364
1365 /*
1366 * bytes 6 - 9: length of the command.
1367 */
1368 scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff;
1369 scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff;
1370 scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff;
1371 scsi_cmd[9] = (unsigned char) length & 0xff;
1372
1373 scsi_cmd[10] = 0; /* reserved */
1374 scsi_cmd[11] = 0; /* control */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375
1376 /*
1377 * We can get a UNIT ATTENTION, for example a power on/reset, so
1378 * retry a few times (like sd.c does for TEST UNIT READY).
1379 * Experience shows some combinations of adapter/devices get at
1380 * least two power on/resets.
1381 *
1382 * Illegal requests (for devices that do not support REPORT LUNS)
1383 * should come through as a check condition, and will not generate
1384 * a retry.
1385 */
1386 for (retries = 0; retries < 3; retries++) {
1387 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending"
1388 " REPORT LUNS to %s (try %d)\n", devname,
1389 retries));
James Bottomley39216032005-06-15 18:48:29 -05001390
James Bottomley39216032005-06-15 18:48:29 -05001391 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001392 lun_data, length, &sshdr,
James Bottomley39216032005-06-15 18:48:29 -05001393 SCSI_TIMEOUT + 4 * HZ, 3);
1394
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS"
James Bottomley39216032005-06-15 18:48:29 -05001396 " %s (try %d) result 0x%x\n", result
1397 ? "failed" : "successful", retries, result));
1398 if (result == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 break;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001400 else if (scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401 if (sshdr.sense_key != UNIT_ATTENTION)
1402 break;
1403 }
1404 }
1405
James Bottomley39216032005-06-15 18:48:29 -05001406 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 /*
1408 * The device probably does not support a REPORT LUN command
1409 */
Alan Stern2ef89192005-11-08 15:51:55 -05001410 ret = 1;
1411 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413
1414 /*
1415 * Get the length from the first four bytes of lun_data.
1416 */
1417 data = (u8 *) lun_data->scsi_lun;
1418 length = ((data[0] << 24) | (data[1] << 16) |
1419 (data[2] << 8) | (data[3] << 0));
1420
1421 num_luns = (length / sizeof(struct scsi_lun));
1422 if (num_luns > max_scsi_report_luns) {
1423 printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)"
1424 " of %d luns reported, try increasing"
1425 " max_scsi_report_luns.\n", devname,
1426 max_scsi_report_luns, num_luns);
1427 num_luns = max_scsi_report_luns;
1428 }
1429
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001430 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1431 "scsi scan: REPORT LUN scan\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432
1433 /*
1434 * Scan the luns in lun_data. The entry at offset 0 is really
1435 * the header, so start at 1 and go up to and including num_luns.
1436 */
1437 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1438 lun = scsilun_to_int(lunp);
1439
1440 /*
1441 * Check if the unused part of lunp is non-zero, and so
1442 * does not fit in lun.
1443 */
1444 if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) {
1445 int i;
1446
1447 /*
1448 * Output an error displaying the LUN in byte order,
1449 * this differs from what linux would print for the
1450 * integer LUN value.
1451 */
1452 printk(KERN_WARNING "scsi: %s lun 0x", devname);
1453 data = (char *)lunp->scsi_lun;
1454 for (i = 0; i < sizeof(struct scsi_lun); i++)
1455 printk("%02x", data[i]);
1456 printk(" has a LUN larger than currently supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 } else if (lun > sdev->host->max_lun) {
1458 printk(KERN_WARNING "scsi: %s lun%d has a LUN larger"
1459 " than allowed by the host adapter\n",
1460 devname, lun);
1461 } else {
1462 int res;
1463
1464 res = scsi_probe_and_add_lun(starget,
1465 lun, NULL, NULL, rescan, NULL);
1466 if (res == SCSI_SCAN_NO_RESPONSE) {
1467 /*
1468 * Got some results, but now none, abort.
1469 */
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001470 sdev_printk(KERN_ERR, sdev,
1471 "Unexpected response"
1472 " from lun %d while scanning, scan"
1473 " aborted\n", lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474 break;
1475 }
1476 }
1477 }
1478
Alan Stern2ef89192005-11-08 15:51:55 -05001479 out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480 kfree(lun_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481 out:
James Bottomley6f3a2022005-09-22 20:33:28 -05001482 scsi_device_put(sdev);
James Bottomley0f1d87a2008-08-22 16:43:59 -05001483 if (scsi_device_created(sdev))
James Bottomley6f3a2022005-09-22 20:33:28 -05001484 /*
1485 * the sdev we used didn't appear in the report luns scan
1486 */
1487 scsi_destroy_sdev(sdev);
Alan Stern2ef89192005-11-08 15:51:55 -05001488 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489}
1490
1491struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
1492 uint id, uint lun, void *hostdata)
1493{
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001494 struct scsi_device *sdev = ERR_PTR(-ENODEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495 struct device *parent = &shost->shost_gendev;
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001496 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497
Matthew Wilcox938e2ac2007-01-15 18:07:09 -07001498 if (strncmp(scsi_scan_type, "none", 4) == 0)
1499 return ERR_PTR(-ENODEV);
1500
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001501 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502 if (!starget)
1503 return ERR_PTR(-ENOMEM);
1504
Arjan van de Ven0b950672006-01-11 13:16:10 +01001505 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001506 if (!shost->async_scan)
1507 scsi_complete_async_scans();
1508
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001509 if (scsi_host_scan_allowed(shost))
1510 scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001511 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512 scsi_target_reap(starget);
1513 put_device(&starget->dev);
1514
1515 return sdev;
1516}
1517EXPORT_SYMBOL(__scsi_add_device);
1518
James Bottomley146f7262005-09-10 12:44:09 -05001519int scsi_add_device(struct Scsi_Host *host, uint channel,
1520 uint target, uint lun)
1521{
1522 struct scsi_device *sdev =
1523 __scsi_add_device(host, channel, target, lun, NULL);
1524 if (IS_ERR(sdev))
1525 return PTR_ERR(sdev);
1526
1527 scsi_device_put(sdev);
1528 return 0;
1529}
1530EXPORT_SYMBOL(scsi_add_device);
1531
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532void scsi_rescan_device(struct device *dev)
1533{
1534 struct scsi_driver *drv;
1535
1536 if (!dev->driver)
1537 return;
1538
1539 drv = to_scsi_driver(dev->driver);
1540 if (try_module_get(drv->owner)) {
1541 if (drv->rescan)
1542 drv->rescan(dev);
1543 module_put(drv->owner);
1544 }
1545}
1546EXPORT_SYMBOL(scsi_rescan_device);
1547
Alan Sterne517d312005-07-26 10:18:45 -04001548static void __scsi_scan_target(struct device *parent, unsigned int channel,
1549 unsigned int id, unsigned int lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550{
1551 struct Scsi_Host *shost = dev_to_shost(parent);
1552 int bflags = 0;
1553 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 struct scsi_target *starget;
1555
1556 if (shost->this_id == id)
1557 /*
1558 * Don't scan the host adapter
1559 */
1560 return;
1561
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563 if (!starget)
1564 return;
1565
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566 if (lun != SCAN_WILD_CARD) {
1567 /*
1568 * Scan for a specific host/chan/id/lun.
1569 */
1570 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1571 goto out_reap;
1572 }
1573
1574 /*
1575 * Scan LUN 0, if there is some response, scan further. Ideally, we
1576 * would not configure LUN 0 until all LUNs are scanned.
1577 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001578 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1579 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1580 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581 /*
1582 * The REPORT LUN did not scan the target,
1583 * do a sequential scan.
1584 */
1585 scsi_sequential_lun_scan(starget, bflags,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001586 starget->scsi_level, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588
1589 out_reap:
1590 /* now determine if the target has any children at all
1591 * and if not, nuke it */
1592 scsi_target_reap(starget);
1593
1594 put_device(&starget->dev);
1595}
Alan Sterne517d312005-07-26 10:18:45 -04001596
1597/**
Randy Dunlape59e4a02008-02-29 22:02:50 -08001598 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
Alan Sterne517d312005-07-26 10:18:45 -04001599 * @parent: host to scan
1600 * @channel: channel to scan
1601 * @id: target id to scan
1602 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1603 * @rescan: passed to LUN scanning routines
1604 *
1605 * Description:
1606 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1607 * and possibly all LUNs on the target id.
1608 *
1609 * First try a REPORT LUN scan, if that does not scan the target, do a
1610 * sequential scan of LUNs on the target id.
1611 **/
1612void scsi_scan_target(struct device *parent, unsigned int channel,
1613 unsigned int id, unsigned int lun, int rescan)
1614{
1615 struct Scsi_Host *shost = dev_to_shost(parent);
1616
Matthew Wilcox93b45af2006-11-22 13:24:53 -07001617 if (strncmp(scsi_scan_type, "none", 4) == 0)
1618 return;
1619
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001620 mutex_lock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001621 if (!shost->async_scan)
1622 scsi_complete_async_scans();
1623
Alan Sterne517d312005-07-26 10:18:45 -04001624 if (scsi_host_scan_allowed(shost))
1625 __scsi_scan_target(parent, channel, id, lun, rescan);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001626 mutex_unlock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001627}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628EXPORT_SYMBOL(scsi_scan_target);
1629
1630static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1631 unsigned int id, unsigned int lun, int rescan)
1632{
1633 uint order_id;
1634
1635 if (id == SCAN_WILD_CARD)
1636 for (id = 0; id < shost->max_id; ++id) {
1637 /*
1638 * XXX adapter drivers when possible (FCP, iSCSI)
1639 * could modify max_id to match the current max,
1640 * not the absolute max.
1641 *
1642 * XXX add a shost id iterator, so for example,
1643 * the FC ID can be the same as a target id
1644 * without a huge overhead of sparse id's.
1645 */
1646 if (shost->reverse_ordering)
1647 /*
1648 * Scan from high to low id.
1649 */
1650 order_id = shost->max_id - id - 1;
1651 else
1652 order_id = id;
Alan Sterne517d312005-07-26 10:18:45 -04001653 __scsi_scan_target(&shost->shost_gendev, channel,
1654 order_id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655 }
1656 else
Alan Sterne517d312005-07-26 10:18:45 -04001657 __scsi_scan_target(&shost->shost_gendev, channel,
1658 id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659}
1660
1661int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1662 unsigned int id, unsigned int lun, int rescan)
1663{
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001664 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
1665 "%s: <%u:%u:%u>\n",
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001666 __func__, channel, id, lun));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667
1668 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
Amit Arora091686d2006-05-19 16:14:50 -07001669 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1671 return -EINVAL;
1672
Arjan van de Ven0b950672006-01-11 13:16:10 +01001673 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001674 if (!shost->async_scan)
1675 scsi_complete_async_scans();
1676
Mike Anderson82f29462005-06-16 11:14:33 -07001677 if (scsi_host_scan_allowed(shost)) {
1678 if (channel == SCAN_WILD_CARD)
1679 for (channel = 0; channel <= shost->max_channel;
1680 channel++)
1681 scsi_scan_channel(shost, channel, id, lun,
1682 rescan);
1683 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684 scsi_scan_channel(shost, channel, id, lun, rescan);
Mike Anderson82f29462005-06-16 11:14:33 -07001685 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001686 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687
1688 return 0;
1689}
1690
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001691static void scsi_sysfs_add_devices(struct Scsi_Host *shost)
1692{
1693 struct scsi_device *sdev;
1694 shost_for_each_device(sdev, shost) {
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001695 if (!scsi_host_scan_allowed(shost) ||
1696 scsi_sysfs_add_sdev(sdev) != 0)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001697 scsi_destroy_sdev(sdev);
1698 }
1699}
1700
1701/**
1702 * scsi_prep_async_scan - prepare for an async scan
1703 * @shost: the host which will be scanned
1704 * Returns: a cookie to be passed to scsi_finish_async_scan()
1705 *
1706 * Tells the midlayer this host is going to do an asynchronous scan.
1707 * It reserves the host's position in the scanning list and ensures
1708 * that other asynchronous scans started after this one won't affect the
1709 * ordering of the discovered devices.
1710 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001711static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001712{
1713 struct async_scan_data *data;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001714 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001715
1716 if (strncmp(scsi_scan_type, "sync", 4) == 0)
1717 return NULL;
1718
1719 if (shost->async_scan) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001720 printk("%s called twice for host %d", __func__,
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001721 shost->host_no);
1722 dump_stack();
1723 return NULL;
1724 }
1725
1726 data = kmalloc(sizeof(*data), GFP_KERNEL);
1727 if (!data)
1728 goto err;
1729 data->shost = scsi_host_get(shost);
1730 if (!data->shost)
1731 goto err;
1732 init_completion(&data->prev_finished);
1733
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001734 mutex_lock(&shost->scan_mutex);
1735 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001736 shost->async_scan = 1;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001737 spin_unlock_irqrestore(shost->host_lock, flags);
1738 mutex_unlock(&shost->scan_mutex);
1739
1740 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001741 if (list_empty(&scanning_hosts))
1742 complete(&data->prev_finished);
1743 list_add_tail(&data->list, &scanning_hosts);
1744 spin_unlock(&async_scan_lock);
1745
1746 return data;
1747
1748 err:
1749 kfree(data);
1750 return NULL;
1751}
1752
1753/**
1754 * scsi_finish_async_scan - asynchronous scan has finished
1755 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1756 *
1757 * All the devices currently attached to this host have been found.
1758 * This function announces all the devices it has found to the rest
1759 * of the system.
1760 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001761static void scsi_finish_async_scan(struct async_scan_data *data)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001762{
1763 struct Scsi_Host *shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001764 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001765
1766 if (!data)
1767 return;
1768
1769 shost = data->shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001770
1771 mutex_lock(&shost->scan_mutex);
1772
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001773 if (!shost->async_scan) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001774 printk("%s called twice for host %d", __func__,
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001775 shost->host_no);
1776 dump_stack();
Julia Lawall773e82f2008-07-21 09:58:30 +02001777 mutex_unlock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001778 return;
1779 }
1780
1781 wait_for_completion(&data->prev_finished);
1782
1783 scsi_sysfs_add_devices(shost);
1784
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001785 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001786 shost->async_scan = 0;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001787 spin_unlock_irqrestore(shost->host_lock, flags);
1788
1789 mutex_unlock(&shost->scan_mutex);
1790
1791 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001792 list_del(&data->list);
1793 if (!list_empty(&scanning_hosts)) {
1794 struct async_scan_data *next = list_entry(scanning_hosts.next,
1795 struct async_scan_data, list);
1796 complete(&next->prev_finished);
1797 }
1798 spin_unlock(&async_scan_lock);
1799
1800 scsi_host_put(shost);
1801 kfree(data);
1802}
1803
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001804static void do_scsi_scan_host(struct Scsi_Host *shost)
1805{
1806 if (shost->hostt->scan_finished) {
1807 unsigned long start = jiffies;
1808 if (shost->hostt->scan_start)
1809 shost->hostt->scan_start(shost);
1810
1811 while (!shost->hostt->scan_finished(shost, jiffies - start))
1812 msleep(10);
1813 } else {
1814 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1815 SCAN_WILD_CARD, 0);
1816 }
1817}
1818
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001819static int do_scan_async(void *_data)
1820{
1821 struct async_scan_data *data = _data;
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001822 do_scsi_scan_host(data->shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001823 scsi_finish_async_scan(data);
1824 return 0;
1825}
1826
Linus Torvalds1da177e2005-04-16 15:20:36 -07001827/**
1828 * scsi_scan_host - scan the given adapter
1829 * @shost: adapter to scan
1830 **/
1831void scsi_scan_host(struct Scsi_Host *shost)
1832{
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001833 struct task_struct *p;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001834 struct async_scan_data *data;
1835
1836 if (strncmp(scsi_scan_type, "none", 4) == 0)
1837 return;
1838
1839 data = scsi_prep_async_scan(shost);
1840 if (!data) {
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001841 do_scsi_scan_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001842 return;
1843 }
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001844
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001845 p = kthread_run(do_scan_async, data, "scsi_scan_%d", shost->host_no);
Hirofumi Nakagawa801678c2008-04-29 01:03:09 -07001846 if (IS_ERR(p))
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001847 do_scan_async(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001848}
1849EXPORT_SYMBOL(scsi_scan_host);
1850
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851void scsi_forget_host(struct Scsi_Host *shost)
1852{
Alan Sterna64358d2005-07-26 10:27:10 -04001853 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001854 unsigned long flags;
1855
Alan Sterna64358d2005-07-26 10:27:10 -04001856 restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857 spin_lock_irqsave(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001858 list_for_each_entry(sdev, &shost->__devices, siblings) {
1859 if (sdev->sdev_state == SDEV_DEL)
1860 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001861 spin_unlock_irqrestore(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001862 __scsi_remove_device(sdev);
1863 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001864 }
1865 spin_unlock_irqrestore(shost->host_lock, flags);
1866}
1867
1868/*
1869 * Function: scsi_get_host_dev()
1870 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001871 * Purpose: Create a scsi_device that points to the host adapter itself.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001873 * Arguments: SHpnt - Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001874 *
1875 * Lock status: None assumed.
1876 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001877 * Returns: The scsi_device or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001878 *
1879 * Notes:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001880 * Attach a single scsi_device to the Scsi_Host - this should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881 * be made to look like a "pseudo-device" that points to the
1882 * HA itself.
1883 *
1884 * Note - this device is not accessible from any high-level
1885 * drivers (including generics), which is probably not
1886 * optimal. We can add hooks later to attach
1887 */
1888struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1889{
Alan Sterne517d312005-07-26 10:18:45 -04001890 struct scsi_device *sdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001891 struct scsi_target *starget;
1892
Arjan van de Ven0b950672006-01-11 13:16:10 +01001893 mutex_lock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001894 if (!scsi_host_scan_allowed(shost))
1895 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1897 if (!starget)
Alan Sterne517d312005-07-26 10:18:45 -04001898 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001899
1900 sdev = scsi_alloc_sdev(starget, 0, NULL);
1901 if (sdev) {
1902 sdev->sdev_gendev.parent = get_device(&starget->dev);
1903 sdev->borken = 0;
James Bottomley884d25c2006-09-05 16:26:41 -05001904 } else
1905 scsi_target_reap(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906 put_device(&starget->dev);
Alan Sterne517d312005-07-26 10:18:45 -04001907 out:
Arjan van de Ven0b950672006-01-11 13:16:10 +01001908 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909 return sdev;
1910}
1911EXPORT_SYMBOL(scsi_get_host_dev);
1912
1913/*
1914 * Function: scsi_free_host_dev()
1915 *
1916 * Purpose: Free a scsi_device that points to the host adapter itself.
1917 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001918 * Arguments: SHpnt - Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919 *
1920 * Lock status: None assumed.
1921 *
1922 * Returns: Nothing
1923 *
1924 * Notes:
1925 */
1926void scsi_free_host_dev(struct scsi_device *sdev)
1927{
1928 BUG_ON(sdev->id != sdev->host->this_id);
1929
James Bottomley6f3a2022005-09-22 20:33:28 -05001930 scsi_destroy_sdev(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931}
1932EXPORT_SYMBOL(scsi_free_host_dev);
1933