blob: 72273a0e56662569931f812b6f628a3e3a4748c8 [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090036#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38#include <scsi/scsi.h>
Christoph Hellwigbeb40482006-06-10 18:01:03 +020039#include <scsi/scsi_cmnd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <scsi/scsi_device.h>
41#include <scsi/scsi_driver.h>
42#include <scsi/scsi_devinfo.h>
43#include <scsi/scsi_host.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <scsi/scsi_transport.h>
45#include <scsi/scsi_eh.h>
46
47#include "scsi_priv.h"
48#include "scsi_logging.h"
49
50#define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
51 " SCSI scanning, some SCSI devices might not be configured\n"
52
53/*
54 * Default timeout
55 */
56#define SCSI_TIMEOUT (2*HZ)
57
58/*
Robert P. J. Day405ae7d2007-02-17 19:13:42 +010059 * Prefix values for the SCSI id's (stored in sysfs name field)
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 */
61#define SCSI_UID_SER_NUM 'S'
62#define SCSI_UID_UNKNOWN 'Z'
63
64/*
65 * Return values of some of the scanning functions.
66 *
67 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
68 * includes allocation or general failures preventing IO from being sent.
69 *
70 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
71 * on the given LUN.
72 *
73 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
74 * given LUN.
75 */
76#define SCSI_SCAN_NO_RESPONSE 0
77#define SCSI_SCAN_TARGET_PRESENT 1
78#define SCSI_SCAN_LUN_PRESENT 2
79
Arjan van de Ven0ad78202005-11-28 16:22:25 +010080static const char *scsi_null_device_strs = "nullnullnullnull";
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
82#define MAX_SCSI_LUNS 512
83
84#ifdef CONFIG_SCSI_MULTI_LUN
85static unsigned int max_scsi_luns = MAX_SCSI_LUNS;
86#else
87static unsigned int max_scsi_luns = 1;
88#endif
89
Masatake YAMATO10f4b892007-09-19 22:59:16 +090090module_param_named(max_luns, max_scsi_luns, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091MODULE_PARM_DESC(max_luns,
92 "last scsi LUN (should be between 1 and 2^32-1)");
93
Matthew Wilcox21db1882006-11-22 13:24:52 -070094#ifdef CONFIG_SCSI_SCAN_ASYNC
95#define SCSI_SCAN_TYPE_DEFAULT "async"
96#else
97#define SCSI_SCAN_TYPE_DEFAULT "sync"
98#endif
99
100static char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT;
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600101
102module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO);
103MODULE_PARM_DESC(scan, "sync, async or none");
104
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105/*
106 * max_scsi_report_luns: the maximum number of LUNS that will be
107 * returned from the REPORT LUNS command. 8 times this value must
108 * be allocated. In theory this could be up to an 8 byte value, but
109 * in practice, the maximum number of LUNs suppored by any device
110 * is about 16k.
111 */
112static unsigned int max_scsi_report_luns = 511;
113
Masatake YAMATO10f4b892007-09-19 22:59:16 +0900114module_param_named(max_report_luns, max_scsi_report_luns, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115MODULE_PARM_DESC(max_report_luns,
116 "REPORT LUNS maximum number of LUNS received (should be"
117 " between 1 and 16384)");
118
Alan Stern14faf122009-03-12 11:08:51 -0400119static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ + 18;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
Masatake YAMATO10f4b892007-09-19 22:59:16 +0900121module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122MODULE_PARM_DESC(inq_timeout,
123 "Timeout (in seconds) waiting for devices to answer INQUIRY."
Alan Stern14faf122009-03-12 11:08:51 -0400124 " Default is 20. Some devices may need more; most need less.");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Matthew Wilcox6b7f1232007-06-26 15:18:51 -0600126/* This lock protects only this list */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600127static DEFINE_SPINLOCK(async_scan_lock);
128static LIST_HEAD(scanning_hosts);
129
130struct async_scan_data {
131 struct list_head list;
132 struct Scsi_Host *shost;
133 struct completion prev_finished;
134};
135
136/**
137 * scsi_complete_async_scans - Wait for asynchronous scans to complete
138 *
Matthew Wilcox8bcc2412006-12-07 19:29:27 -0700139 * When this function returns, any host which started scanning before
140 * this function was called will have finished its scan. Hosts which
141 * started scanning after this function was called may or may not have
142 * finished.
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600143 */
144int scsi_complete_async_scans(void)
145{
146 struct async_scan_data *data;
147
148 do {
149 if (list_empty(&scanning_hosts))
150 return 0;
151 /* If we can't get memory immediately, that's OK. Just
152 * sleep a little. Even if we never get memory, the async
153 * scans will finish eventually.
154 */
155 data = kmalloc(sizeof(*data), GFP_KERNEL);
156 if (!data)
157 msleep(1);
158 } while (!data);
159
160 data->shost = NULL;
161 init_completion(&data->prev_finished);
162
163 spin_lock(&async_scan_lock);
164 /* Check that there's still somebody else on the list */
165 if (list_empty(&scanning_hosts))
166 goto done;
167 list_add_tail(&data->list, &scanning_hosts);
168 spin_unlock(&async_scan_lock);
169
170 printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n");
171 wait_for_completion(&data->prev_finished);
172
173 spin_lock(&async_scan_lock);
174 list_del(&data->list);
Matthew Wilcox8bcc2412006-12-07 19:29:27 -0700175 if (!list_empty(&scanning_hosts)) {
176 struct async_scan_data *next = list_entry(scanning_hosts.next,
177 struct async_scan_data, list);
178 complete(&next->prev_finished);
179 }
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600180 done:
181 spin_unlock(&async_scan_lock);
182
183 kfree(data);
184 return 0;
185}
186
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600187/* Only exported for the benefit of scsi_wait_scan */
188EXPORT_SYMBOL_GPL(scsi_complete_async_scans);
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600189
Hugh Dickinsf2f027c2007-05-23 14:41:42 -0700190#ifndef MODULE
191/*
192 * For async scanning we need to wait for all the scans to complete before
193 * trying to mount the root fs. Otherwise non-modular drivers may not be ready
194 * yet.
195 */
196late_initcall(scsi_complete_async_scans);
197#endif
198
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199/**
200 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
James Bottomley39216032005-06-15 18:48:29 -0500201 * @sdev: scsi device to send command to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 * @result: area to store the result of the MODE SENSE
203 *
204 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500205 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 * Called for BLIST_KEY devices.
207 **/
James Bottomley39216032005-06-15 18:48:29 -0500208static void scsi_unlock_floptical(struct scsi_device *sdev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 unsigned char *result)
210{
211 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
212
213 printk(KERN_NOTICE "scsi: unlocking floptical drive\n");
214 scsi_cmd[0] = MODE_SENSE;
215 scsi_cmd[1] = 0;
216 scsi_cmd[2] = 0x2e;
217 scsi_cmd[3] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500218 scsi_cmd[4] = 0x2a; /* size */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 scsi_cmd[5] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500220 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900221 SCSI_TIMEOUT, 3, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222}
223
224/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 * scsi_alloc_sdev - allocate and setup a scsi_Device
Rob Landleyeb448202007-11-03 13:30:39 -0500226 * @starget: which target to allocate a &scsi_device for
227 * @lun: which lun
228 * @hostdata: usually NULL and set by ->slave_alloc instead
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 *
230 * Description:
231 * Allocate, initialize for io, and return a pointer to a scsi_Device.
232 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
233 * adds scsi_Device to the appropriate list.
234 *
235 * Return value:
236 * scsi_Device pointer, or NULL on failure.
237 **/
238static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
239 unsigned int lun, void *hostdata)
240{
241 struct scsi_device *sdev;
242 int display_failure_msg = 1, ret;
243 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
Jeff Garzika341cd02007-10-29 17:15:22 -0400244 extern void scsi_evt_thread(struct work_struct *work);
Jens Axboe9937a5e2011-05-17 11:04:44 +0200245 extern void scsi_requeue_run_queue(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
Jes Sorensen24669f752006-01-16 10:31:18 -0500247 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 GFP_ATOMIC);
249 if (!sdev)
250 goto out;
251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 sdev->vendor = scsi_null_device_strs;
253 sdev->model = scsi_null_device_strs;
254 sdev->rev = scsi_null_device_strs;
255 sdev->host = shost;
Vasu Dev4a840672009-10-22 15:46:33 -0700256 sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 sdev->id = starget->id;
258 sdev->lun = lun;
259 sdev->channel = starget->channel;
260 sdev->sdev_state = SDEV_CREATED;
261 INIT_LIST_HEAD(&sdev->siblings);
262 INIT_LIST_HEAD(&sdev->same_target_siblings);
263 INIT_LIST_HEAD(&sdev->cmd_list);
264 INIT_LIST_HEAD(&sdev->starved_entry);
Jeff Garzika341cd02007-10-29 17:15:22 -0400265 INIT_LIST_HEAD(&sdev->event_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 spin_lock_init(&sdev->list_lock);
Jeff Garzika341cd02007-10-29 17:15:22 -0400267 INIT_WORK(&sdev->event_work, scsi_evt_thread);
Jens Axboe9937a5e2011-05-17 11:04:44 +0200268 INIT_WORK(&sdev->requeue_work, scsi_requeue_run_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
270 sdev->sdev_gendev.parent = get_device(&starget->dev);
271 sdev->sdev_target = starget;
272
273 /* usually NULL and set by ->slave_alloc instead */
274 sdev->hostdata = hostdata;
275
276 /* if the device needs this changing, it may do so in the
277 * slave_configure function */
278 sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
279
280 /*
281 * Some low level driver could use device->type
282 */
283 sdev->type = -1;
284
285 /*
286 * Assume that the device will have handshaking problems,
287 * and then fix this field later if it turns out it
288 * doesn't
289 */
290 sdev->borken = 1;
291
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 sdev->request_queue = scsi_alloc_queue(sdev);
293 if (!sdev->request_queue) {
294 /* release fn is set up in scsi_sysfs_device_initialise, so
295 * have to free and put manually here */
296 put_device(&starget->dev);
Dave Jones93f560892006-03-09 10:21:27 -0500297 kfree(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 goto out;
299 }
James Bottomleye73e0792011-05-25 15:52:14 -0500300 blk_get_queue(sdev->request_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 sdev->request_queue->queuedata = sdev;
302 scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
303
304 scsi_sysfs_device_initialize(sdev);
305
306 if (shost->hostt->slave_alloc) {
307 ret = shost->hostt->slave_alloc(sdev);
308 if (ret) {
309 /*
310 * if LLDD reports slave not present, don't clutter
311 * console with alloc failure messages
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 */
313 if (ret == -ENXIO)
314 display_failure_msg = 0;
315 goto out_device_destroy;
316 }
317 }
318
319 return sdev;
320
321out_device_destroy:
James Smartc2f9e492009-01-27 11:41:36 -0500322 scsi_device_set_state(sdev, SDEV_DEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 transport_destroy_device(&sdev->sdev_gendev);
James Bottomley37e6ba02009-10-02 13:30:08 -0500324 put_device(&sdev->sdev_dev);
Anton Blanchardf7c9c6b2011-11-03 08:56:22 +1100325 scsi_free_queue(sdev->request_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 put_device(&sdev->sdev_gendev);
327out:
328 if (display_failure_msg)
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700329 printk(ALLOC_FAILURE_MSG, __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 return NULL;
331}
332
James Bottomley643eb2d2008-03-22 22:42:27 -0500333static void scsi_target_destroy(struct scsi_target *starget)
334{
335 struct device *dev = &starget->dev;
336 struct Scsi_Host *shost = dev_to_shost(dev->parent);
337 unsigned long flags;
338
339 transport_destroy_device(dev);
340 spin_lock_irqsave(shost->host_lock, flags);
341 if (shost->hostt->target_destroy)
342 shost->hostt->target_destroy(starget);
343 list_del_init(&starget->siblings);
344 spin_unlock_irqrestore(shost->host_lock, flags);
345 put_device(dev);
346}
347
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348static void scsi_target_dev_release(struct device *dev)
349{
350 struct device *parent = dev->parent;
351 struct scsi_target *starget = to_scsi_target(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500352
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 kfree(starget);
354 put_device(parent);
355}
356
Adrian Bunk453cd0f2008-07-03 23:47:33 -0700357static struct device_type scsi_target_type = {
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100358 .name = "scsi_target",
359 .release = scsi_target_dev_release,
360};
361
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362int scsi_is_target_device(const struct device *dev)
363{
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100364 return dev->type == &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365}
366EXPORT_SYMBOL(scsi_is_target_device);
367
368static struct scsi_target *__scsi_find_target(struct device *parent,
369 int channel, uint id)
370{
371 struct scsi_target *starget, *found_starget = NULL;
372 struct Scsi_Host *shost = dev_to_shost(parent);
373 /*
374 * Search for an existing target for this sdev.
375 */
376 list_for_each_entry(starget, &shost->__targets, siblings) {
377 if (starget->id == id &&
378 starget->channel == channel) {
379 found_starget = starget;
380 break;
381 }
382 }
383 if (found_starget)
384 get_device(&found_starget->dev);
385
386 return found_starget;
387}
388
James Bottomley884d25c2006-09-05 16:26:41 -0500389/**
390 * scsi_alloc_target - allocate a new or find an existing target
391 * @parent: parent of the target (need not be a scsi host)
392 * @channel: target channel number (zero if no channels)
393 * @id: target id number
394 *
395 * Return an existing target if one exists, provided it hasn't already
396 * gone into STARGET_DEL state, otherwise allocate a new target.
397 *
398 * The target is returned with an incremented reference, so the caller
399 * is responsible for both reaping and doing a last put
400 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401static struct scsi_target *scsi_alloc_target(struct device *parent,
402 int channel, uint id)
403{
404 struct Scsi_Host *shost = dev_to_shost(parent);
405 struct device *dev = NULL;
406 unsigned long flags;
407 const int size = sizeof(struct scsi_target)
408 + shost->transportt->target_size;
James.Smart@Emulex.Com5c44cd22005-06-10 22:24:30 -0400409 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 struct scsi_target *found_target;
Brian King32f95792006-02-22 14:28:24 -0600411 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412
Jes Sorensen24669f752006-01-16 10:31:18 -0500413 starget = kzalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 if (!starget) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700415 printk(KERN_ERR "%s: allocation failure\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 return NULL;
417 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 dev = &starget->dev;
419 device_initialize(dev);
420 starget->reap_ref = 1;
421 dev->parent = get_device(parent);
Kay Sievers71610f52008-12-03 22:41:36 +0100422 dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id);
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100423 dev->bus = &scsi_bus_type;
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100424 dev->type = &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 starget->id = id;
426 starget->channel = channel;
Mike Christief0c0a372008-08-17 15:24:38 -0500427 starget->can_queue = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 INIT_LIST_HEAD(&starget->siblings);
429 INIT_LIST_HEAD(&starget->devices);
James Bottomley643eb2d2008-03-22 22:42:27 -0500430 starget->state = STARGET_CREATED;
Alan Stern7c9d6f12007-01-08 11:12:32 -0500431 starget->scsi_level = SCSI_2;
Edward Gogginc53a2842009-04-09 10:02:22 -0700432 starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED;
James Bottomleyffedb452006-02-23 14:27:18 -0600433 retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 spin_lock_irqsave(shost->host_lock, flags);
435
436 found_target = __scsi_find_target(parent, channel, id);
437 if (found_target)
438 goto found;
439
440 list_add_tail(&starget->siblings, &shost->__targets);
441 spin_unlock_irqrestore(shost->host_lock, flags);
442 /* allocate and add */
James Bottomleya283bd32005-05-24 12:06:38 -0500443 transport_setup_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500444 if (shost->hostt->target_alloc) {
Brian King32f95792006-02-22 14:28:24 -0600445 error = shost->hostt->target_alloc(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500446
447 if(error) {
448 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
449 /* don't want scsi_target_reap to do the final
450 * put because it will be under the host lock */
James Bottomley643eb2d2008-03-22 22:42:27 -0500451 scsi_target_destroy(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500452 return NULL;
453 }
454 }
James Bottomley884d25c2006-09-05 16:26:41 -0500455 get_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500456
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 return starget;
458
459 found:
460 found_target->reap_ref++;
461 spin_unlock_irqrestore(shost->host_lock, flags);
James Bottomleyffedb452006-02-23 14:27:18 -0600462 if (found_target->state != STARGET_DEL) {
Alan Stern12fb8c12010-03-18 15:41:22 -0400463 put_device(dev);
James Bottomleyffedb452006-02-23 14:27:18 -0600464 return found_target;
465 }
466 /* Unfortunately, we found a dying target; need to
467 * wait until it's dead before we can get a new one */
468 put_device(&found_target->dev);
469 flush_scheduled_work();
470 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471}
472
David Howells65f27f32006-11-22 14:55:48 +0000473static void scsi_target_reap_usercontext(struct work_struct *work)
James Bottomley65110b22006-02-14 10:48:46 -0600474{
David Howells65f27f32006-11-22 14:55:48 +0000475 struct scsi_target *starget =
476 container_of(work, struct scsi_target, ew.work);
James Bottomley863a9302005-12-15 20:01:43 -0800477
James Bottomleyffedb452006-02-23 14:27:18 -0600478 transport_remove_device(&starget->dev);
479 device_del(&starget->dev);
James Bottomley643eb2d2008-03-22 22:42:27 -0500480 scsi_target_destroy(starget);
James Bottomley863a9302005-12-15 20:01:43 -0800481}
482
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483/**
484 * scsi_target_reap - check to see if target is in use and destroy if not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 * @starget: target to be checked
486 *
487 * This is used after removing a LUN or doing a last put of the target
488 * it checks atomically that nothing is using the target and removes
489 * it if so.
490 */
491void scsi_target_reap(struct scsi_target *starget)
492{
James Bottomleyffedb452006-02-23 14:27:18 -0600493 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
494 unsigned long flags;
James Bottomley643eb2d2008-03-22 22:42:27 -0500495 enum scsi_target_state state;
Alan Sternf9e88942010-03-18 15:39:30 -0400496 int empty = 0;
James Bottomleyffedb452006-02-23 14:27:18 -0600497
498 spin_lock_irqsave(shost->host_lock, flags);
James Bottomley643eb2d2008-03-22 22:42:27 -0500499 state = starget->state;
Alan Sternf9e88942010-03-18 15:39:30 -0400500 if (--starget->reap_ref == 0 && list_empty(&starget->devices)) {
501 empty = 1;
502 starget->state = STARGET_DEL;
503 }
James Bottomleyffedb452006-02-23 14:27:18 -0600504 spin_unlock_irqrestore(shost->host_lock, flags);
505
James Bottomley643eb2d2008-03-22 22:42:27 -0500506 if (!empty)
507 return;
508
509 BUG_ON(state == STARGET_DEL);
James Bottomley643eb2d2008-03-22 22:42:27 -0500510 if (state == STARGET_CREATED)
511 scsi_target_destroy(starget);
512 else
513 execute_in_process_context(scsi_target_reap_usercontext,
514 &starget->ew);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515}
516
517/**
Alan Sterne5b3cd42006-08-21 15:53:25 -0400518 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
519 * @s: INQUIRY result string to sanitize
520 * @len: length of the string
521 *
522 * Description:
523 * The SCSI spec says that INQUIRY vendor, product, and revision
524 * strings must consist entirely of graphic ASCII characters,
525 * padded on the right with spaces. Since not all devices obey
526 * this rule, we will replace non-graphic or non-ASCII characters
527 * with spaces. Exception: a NUL character is interpreted as a
528 * string terminator, so all the following characters are set to
529 * spaces.
530 **/
531static void sanitize_inquiry_string(unsigned char *s, int len)
532{
533 int terminated = 0;
534
535 for (; len > 0; (--len, ++s)) {
536 if (*s == 0)
537 terminated = 1;
538 if (terminated || *s < 0x20 || *s > 0x7e)
539 *s = ' ';
540 }
541}
542
543/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
James Bottomley39216032005-06-15 18:48:29 -0500545 * @sdev: scsi_device to probe
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 * @inq_result: area to store the INQUIRY result
James Bottomley39216032005-06-15 18:48:29 -0500547 * @result_len: len of inq_result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 * @bflags: store any bflags found here
549 *
550 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500551 * Probe the lun associated with @req using a standard SCSI INQUIRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 *
James Bottomley39216032005-06-15 18:48:29 -0500553 * If the INQUIRY is successful, zero is returned and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100555 * are copied to the scsi_device any flags value is stored in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400557static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
James Bottomley39216032005-06-15 18:48:29 -0500558 int result_len, int *bflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
561 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
562 int response_len = 0;
James Bottomley39216032005-06-15 18:48:29 -0500563 int pass, count, result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 struct scsi_sense_hdr sshdr;
565
566 *bflags = 0;
567
568 /* Perform up to 3 passes. The first pass uses a conservative
569 * transfer length of 36 unless sdev->inquiry_len specifies a
570 * different value. */
571 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
572 try_inquiry_len = first_inquiry_len;
573 pass = 1;
574
575 next_pass:
James Bottomley9ccfc752005-10-02 11:45:08 -0500576 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
577 "scsi scan: INQUIRY pass %d length %d\n",
578 pass, try_inquiry_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
580 /* Each pass gets up to three chances to ignore Unit Attention */
581 for (count = 0; count < 3; ++count) {
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900582 int resid;
583
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 memset(scsi_cmd, 0, 6);
585 scsi_cmd[0] = INQUIRY;
586 scsi_cmd[4] = (unsigned char) try_inquiry_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
588 memset(inq_result, 0, try_inquiry_len);
James Bottomley39216032005-06-15 18:48:29 -0500589
590 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -0500591 inq_result, try_inquiry_len, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900592 HZ / 2 + HZ * scsi_inq_timeout, 3,
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900593 &resid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
595 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
596 "with code 0x%x\n",
James Bottomley39216032005-06-15 18:48:29 -0500597 result ? "failed" : "successful", result));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598
James Bottomley39216032005-06-15 18:48:29 -0500599 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 /*
601 * not-ready to ready transition [asc/ascq=0x28/0x0]
602 * or power-on, reset [asc/ascq=0x29/0x0], continue.
603 * INQUIRY should not yield UNIT_ATTENTION
604 * but many buggy devices do so anyway.
605 */
James Bottomley39216032005-06-15 18:48:29 -0500606 if ((driver_byte(result) & DRIVER_SENSE) &&
James Bottomleyea73a9f2005-08-28 11:33:52 -0500607 scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 if ((sshdr.sense_key == UNIT_ATTENTION) &&
609 ((sshdr.asc == 0x28) ||
610 (sshdr.asc == 0x29)) &&
611 (sshdr.ascq == 0))
612 continue;
613 }
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900614 } else {
615 /*
616 * if nothing was transferred, we try
617 * again. It's a workaround for some USB
618 * devices.
619 */
620 if (resid == try_inquiry_len)
621 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 }
623 break;
624 }
625
James Bottomley39216032005-06-15 18:48:29 -0500626 if (result == 0) {
Alan Sterne5b3cd42006-08-21 15:53:25 -0400627 sanitize_inquiry_string(&inq_result[8], 8);
628 sanitize_inquiry_string(&inq_result[16], 16);
629 sanitize_inquiry_string(&inq_result[32], 4);
630
631 response_len = inq_result[4] + 5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 if (response_len > 255)
633 response_len = first_inquiry_len; /* sanity */
634
635 /*
636 * Get any flags for this device.
637 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100638 * XXX add a bflags to scsi_device, and replace the
639 * corresponding bit fields in scsi_device, so bflags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 * need not be passed as an argument.
641 */
642 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
643 &inq_result[16]);
644
645 /* When the first pass succeeds we gain information about
646 * what larger transfer lengths might work. */
647 if (pass == 1) {
648 if (BLIST_INQUIRY_36 & *bflags)
649 next_inquiry_len = 36;
650 else if (BLIST_INQUIRY_58 & *bflags)
651 next_inquiry_len = 58;
652 else if (sdev->inquiry_len)
653 next_inquiry_len = sdev->inquiry_len;
654 else
655 next_inquiry_len = response_len;
656
657 /* If more data is available perform the second pass */
658 if (next_inquiry_len > try_inquiry_len) {
659 try_inquiry_len = next_inquiry_len;
660 pass = 2;
661 goto next_pass;
662 }
663 }
664
665 } else if (pass == 2) {
666 printk(KERN_INFO "scsi scan: %d byte inquiry failed. "
667 "Consider BLIST_INQUIRY_36 for this device\n",
668 try_inquiry_len);
669
670 /* If this pass failed, the third pass goes back and transfers
671 * the same amount as we successfully got in the first pass. */
672 try_inquiry_len = first_inquiry_len;
673 pass = 3;
674 goto next_pass;
675 }
676
677 /* If the last transfer attempt got an error, assume the
678 * peripheral doesn't exist or is dead. */
James Bottomley39216032005-06-15 18:48:29 -0500679 if (result)
680 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681
682 /* Don't report any more data than the device says is valid */
683 sdev->inquiry_len = min(try_inquiry_len, response_len);
684
685 /*
686 * XXX Abort if the response length is less than 36? If less than
687 * 32, the lookup of the device flags (above) could be invalid,
688 * and it would be possible to take an incorrect action - we do
689 * not want to hang because of a short INQUIRY. On the flip side,
690 * if the device is spun down or becoming ready (and so it gives a
691 * short INQUIRY), an abort here prevents any further use of the
692 * device, including spin up.
693 *
Alan Sterne423ee32007-02-16 01:46:38 -0800694 * On the whole, the best approach seems to be to assume the first
695 * 36 bytes are valid no matter what the device says. That's
696 * better than copying < 36 bytes to the inquiry-result buffer
697 * and displaying garbage for the Vendor, Product, or Revision
698 * strings.
699 */
700 if (sdev->inquiry_len < 36) {
701 printk(KERN_INFO "scsi scan: INQUIRY result too short (%d),"
702 " using 36\n", sdev->inquiry_len);
703 sdev->inquiry_len = 36;
704 }
705
706 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 * Related to the above issue:
708 *
709 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
710 * and if not ready, sent a START_STOP to start (maybe spin up) and
711 * then send the INQUIRY again, since the INQUIRY can change after
712 * a device is initialized.
713 *
714 * Ideally, start a device if explicitly asked to do so. This
715 * assumes that a device is spun up on power on, spun down on
716 * request, and then spun up on request.
717 */
718
719 /*
720 * The scanning code needs to know the scsi_level, even if no
721 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
722 * non-zero LUNs can be scanned.
723 */
724 sdev->scsi_level = inq_result[2] & 0x07;
725 if (sdev->scsi_level >= 2 ||
726 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
727 sdev->scsi_level++;
James Bottomley6f3a2022005-09-22 20:33:28 -0500728 sdev->sdev_target->scsi_level = sdev->scsi_level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729
James Bottomley39216032005-06-15 18:48:29 -0500730 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731}
732
733/**
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100734 * scsi_add_lun - allocate and fully initialze a scsi_device
Matthew Wilcox6d877682007-07-11 12:54:55 -0600735 * @sdev: holds information to be stored in the new scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 * @inq_result: holds the result of a previous INQUIRY to the LUN
737 * @bflags: black/white list flag
Matthew Wilcox6d877682007-07-11 12:54:55 -0600738 * @async: 1 if this device is being scanned asynchronously
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 *
740 * Description:
Matthew Wilcox6d877682007-07-11 12:54:55 -0600741 * Initialize the scsi_device @sdev. Optionally set fields based
742 * on values in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 *
744 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100745 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
746 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400748static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600749 int *bflags, int async)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750{
James Bottomley6f4267e2008-08-22 16:53:31 -0500751 int ret;
752
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 /*
754 * XXX do not save the inquiry, since it can change underneath us,
755 * save just vendor/model/rev.
756 *
757 * Rather than save it and have an ioctl that retrieves the saved
758 * value, have an ioctl that executes the same INQUIRY code used
759 * in scsi_probe_lun, let user level programs doing INQUIRY
760 * scanning run at their own risk, or supply a user level program
761 * that can correctly scan.
762 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763
Alan Stern09123d22006-11-10 12:27:57 -0800764 /*
765 * Copy at least 36 bytes of INQUIRY data, so that we don't
766 * dereference unallocated memory when accessing the Vendor,
767 * Product, and Revision strings. Badly behaved devices may set
768 * the INQUIRY Additional Length byte to a small value, indicating
769 * these strings are invalid, but often they contain plausible data
770 * nonetheless. It doesn't matter if the device sent < 36 bytes
771 * total, since scsi_probe_lun() initializes inq_result with 0s.
772 */
773 sdev->inquiry = kmemdup(inq_result,
774 max_t(size_t, sdev->inquiry_len, 36),
775 GFP_ATOMIC);
776 if (sdev->inquiry == NULL)
777 return SCSI_SCAN_NO_RESPONSE;
778
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 sdev->vendor = (char *) (sdev->inquiry + 8);
780 sdev->model = (char *) (sdev->inquiry + 16);
781 sdev->rev = (char *) (sdev->inquiry + 32);
782
783 if (*bflags & BLIST_ISROM) {
Matthew Wilcox6d877682007-07-11 12:54:55 -0600784 sdev->type = TYPE_ROM;
785 sdev->removable = 1;
786 } else {
787 sdev->type = (inq_result[0] & 0x1f);
788 sdev->removable = (inq_result[1] & 0x80) >> 7;
789 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790
Matthew Wilcox6d877682007-07-11 12:54:55 -0600791 switch (sdev->type) {
James Bottomleyddaf6fc2006-12-13 10:10:40 -0600792 case TYPE_RBC:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 case TYPE_TAPE:
794 case TYPE_DISK:
795 case TYPE_PRINTER:
796 case TYPE_MOD:
797 case TYPE_PROCESSOR:
798 case TYPE_SCANNER:
799 case TYPE_MEDIUM_CHANGER:
800 case TYPE_ENCLOSURE:
801 case TYPE_COMM:
James Bottomley4d7db042006-03-31 20:07:45 -0600802 case TYPE_RAID:
Boaz Harrosh82443a52009-01-25 16:51:33 +0200803 case TYPE_OSD:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 sdev->writeable = 1;
805 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 case TYPE_ROM:
James Bottomleyddaf6fc2006-12-13 10:10:40 -0600807 case TYPE_WORM:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 sdev->writeable = 0;
809 break;
810 default:
811 printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type);
812 }
813
Matthew Wilcox6d877682007-07-11 12:54:55 -0600814 if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {
815 /* RBC and MMC devices can return SCSI-3 compliance and yet
816 * still not support REPORT LUNS, so make them act as
817 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
818 * specifically set */
819 if ((*bflags & BLIST_REPORTLUN2) == 0)
820 *bflags |= BLIST_NOREPORTLUN;
821 }
822
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 /*
824 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
825 * spec says: The device server is capable of supporting the
826 * specified peripheral device type on this logical unit. However,
827 * the physical device is not currently connected to this logical
828 * unit.
829 *
830 * The above is vague, as it implies that we could treat 001 and
831 * 011 the same. Stay compatible with previous code, and create a
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100832 * scsi_device for a PQ of 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 *
834 * Don't set the device offline here; rather let the upper
835 * level drivers eval the PQ to decide whether they should
836 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
837 */
838
839 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 sdev->lockable = sdev->removable;
841 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
842
Matthew Wilcox6d877682007-07-11 12:54:55 -0600843 if (sdev->scsi_level >= SCSI_3 ||
844 (sdev->inquiry_len > 56 && inq_result[56] & 0x04))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 sdev->ppr = 1;
846 if (inq_result[7] & 0x60)
847 sdev->wdtr = 1;
848 if (inq_result[7] & 0x10)
849 sdev->sdtr = 1;
850
James Bottomley19ac0db2006-08-06 18:15:22 -0500851 sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d "
Matthew Wilcox4ff36712006-07-04 12:15:20 -0600852 "ANSI: %d%s\n", scsi_device_type(sdev->type),
853 sdev->vendor, sdev->model, sdev->rev,
854 sdev->inq_periph_qual, inq_result[2] & 0x07,
855 (inq_result[3] & 0x0f) == 1 ? " CCS" : "");
856
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
858 !(*bflags & BLIST_NOTQ))
859 sdev->tagged_supported = 1;
Matthew Wilcox6d877682007-07-11 12:54:55 -0600860
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 /*
862 * Some devices (Texel CD ROM drives) have handshaking problems
863 * when used with the Seagate controllers. borken is initialized
864 * to 1, and then set it to 0 here.
865 */
866 if ((*bflags & BLIST_BORKEN) == 0)
867 sdev->borken = 0;
868
Matthew Wilcox6d877682007-07-11 12:54:55 -0600869 if (*bflags & BLIST_NO_ULD_ATTACH)
870 sdev->no_uld_attach = 1;
871
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 /*
873 * Apparently some really broken devices (contrary to the SCSI
874 * standards) need to be selected without asserting ATN
875 */
876 if (*bflags & BLIST_SELECT_NO_ATN)
877 sdev->select_no_atn = 1;
878
879 /*
James Bottomley4d7db042006-03-31 20:07:45 -0600880 * Maximum 512 sector transfer length
881 * broken RA4x00 Compaq Disk Array
882 */
883 if (*bflags & BLIST_MAX_512)
Martin K. Petersen086fa5f2010-02-26 00:20:38 -0500884 blk_queue_max_hw_sectors(sdev->request_queue, 512);
James Bottomley4d7db042006-03-31 20:07:45 -0600885
886 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 * Some devices may not want to have a start command automatically
888 * issued when a device is added.
889 */
890 if (*bflags & BLIST_NOSTARTONADD)
891 sdev->no_start_on_add = 1;
892
893 if (*bflags & BLIST_SINGLELUN)
Tony Battersby25d7c362007-11-12 10:00:44 -0500894 scsi_target(sdev)->single_lun = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 sdev->use_10_for_rw = 1;
897
898 if (*bflags & BLIST_MS_SKIP_PAGE_08)
899 sdev->skip_ms_page_8 = 1;
900
901 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
902 sdev->skip_ms_page_3f = 1;
903
904 if (*bflags & BLIST_USE_10_BYTE_MS)
905 sdev->use_10_for_ms = 1;
906
907 /* set the device running here so that slave configure
908 * may do I/O */
James Bottomley6f4267e2008-08-22 16:53:31 -0500909 ret = scsi_device_set_state(sdev, SDEV_RUNNING);
910 if (ret) {
911 ret = scsi_device_set_state(sdev, SDEV_BLOCK);
912
913 if (ret) {
914 sdev_printk(KERN_ERR, sdev,
915 "in wrong state %s to complete scan\n",
916 scsi_device_state_name(sdev->sdev_state));
917 return SCSI_SCAN_NO_RESPONSE;
918 }
919 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920
921 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
922 sdev->use_192_bytes_for_3f = 1;
923
924 if (*bflags & BLIST_NOT_LOCKABLE)
925 sdev->lockable = 0;
926
927 if (*bflags & BLIST_RETRY_HWERROR)
928 sdev->retry_hwerror = 1;
929
930 transport_configure_device(&sdev->sdev_gendev);
931
Christoph Hellwig93805092006-02-17 12:11:29 +0100932 if (sdev->host->hostt->slave_configure) {
James Bottomley6f4267e2008-08-22 16:53:31 -0500933 ret = sdev->host->hostt->slave_configure(sdev);
Christoph Hellwig93805092006-02-17 12:11:29 +0100934 if (ret) {
935 /*
936 * if LLDD reports slave not present, don't clutter
937 * console with alloc failure messages
938 */
939 if (ret != -ENXIO) {
940 sdev_printk(KERN_ERR, sdev,
941 "failed to configure device\n");
942 }
943 return SCSI_SCAN_NO_RESPONSE;
944 }
945 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946
Vasu Dev4a840672009-10-22 15:46:33 -0700947 sdev->max_queue_depth = sdev->queue_depth;
948
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 /*
950 * Ok, the device is now all set up, we can
951 * register it and tell the rest of the kernel
952 * about it.
953 */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600954 if (!async && scsi_sysfs_add_sdev(sdev) != 0)
Alan Sternb24b1032005-07-27 11:43:46 -0700955 return SCSI_SCAN_NO_RESPONSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956
957 return SCSI_SCAN_LUN_PRESENT;
958}
959
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700960#ifdef CONFIG_SCSI_LOGGING
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200961/**
Rob Landleyeb448202007-11-03 13:30:39 -0500962 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200963 * @buf: Output buffer with at least end-first+1 bytes of space
964 * @inq: Inquiry buffer (input)
965 * @first: Offset of string into inq
966 * @end: Index after last character in inq
967 */
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700968static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200969 unsigned first, unsigned end)
970{
971 unsigned term = 0, idx;
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700972
973 for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
974 if (inq[idx+first] > ' ') {
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200975 buf[idx] = inq[idx+first];
976 term = idx+1;
977 } else {
978 buf[idx] = ' ';
979 }
980 }
981 buf[term] = 0;
982 return buf;
983}
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700984#endif
James Bottomley6f3a2022005-09-22 20:33:28 -0500985
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986/**
987 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
988 * @starget: pointer to target device structure
989 * @lun: LUN of target device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 * @bflagsp: store bflags here if not NULL
Rob Landleyeb448202007-11-03 13:30:39 -0500991 * @sdevp: probe the LUN corresponding to this scsi_device
992 * @rescan: if nonzero skip some code only needed on first scan
993 * @hostdata: passed to scsi_alloc_sdev()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 *
995 * Description:
996 * Call scsi_probe_lun, if a LUN with an attached device is found,
997 * allocate and set it up by calling scsi_add_lun.
998 *
999 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001000 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
1002 * attached at the LUN
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001003 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 **/
1005static int scsi_probe_and_add_lun(struct scsi_target *starget,
1006 uint lun, int *bflagsp,
1007 struct scsi_device **sdevp, int rescan,
1008 void *hostdata)
1009{
1010 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 unsigned char *result;
James Bottomley39216032005-06-15 18:48:29 -05001012 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1014
1015 /*
1016 * The rescan flag is used as an optimization, the first scan of a
1017 * host adapter calls into here with rescan == 0.
1018 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001019 sdev = scsi_device_lookup_by_target(starget, lun);
1020 if (sdev) {
James Bottomley0f1d87a2008-08-22 16:43:59 -05001021 if (rescan || !scsi_device_created(sdev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1023 "scsi scan: device exists on %s\n",
Kay Sievers71610f52008-12-03 22:41:36 +01001024 dev_name(&sdev->sdev_gendev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 if (sdevp)
1026 *sdevp = sdev;
1027 else
1028 scsi_device_put(sdev);
1029
1030 if (bflagsp)
1031 *bflagsp = scsi_get_device_flags(sdev,
1032 sdev->vendor,
1033 sdev->model);
1034 return SCSI_SCAN_LUN_PRESENT;
1035 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001036 scsi_device_put(sdev);
1037 } else
1038 sdev = scsi_alloc_sdev(starget, lun, hostdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 if (!sdev)
1040 goto out;
James Bottomley39216032005-06-15 18:48:29 -05001041
1042 result = kmalloc(result_len, GFP_ATOMIC |
Al Virobc861202005-04-24 12:28:34 -07001043 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 if (!result)
James Bottomley39216032005-06-15 18:48:29 -05001045 goto out_free_sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046
James Bottomley39216032005-06-15 18:48:29 -05001047 if (scsi_probe_lun(sdev, result, result_len, &bflags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 goto out_free_result;
1049
Kurt Garloff4186ab12006-04-03 15:16:48 +02001050 if (bflagsp)
1051 *bflagsp = bflags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 /*
1053 * result contains valid SCSI INQUIRY data.
1054 */
Kurt Garloff13f7e5a2006-04-03 15:20:08 +02001055 if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 /*
1057 * For a Peripheral qualifier 3 (011b), the SCSI
1058 * spec says: The device server is not capable of
1059 * supporting a physical device on this logical
1060 * unit.
1061 *
1062 * For disks, this implies that there is no
1063 * logical disk configured at sdev->lun, but there
1064 * is a target id responding.
1065 */
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001066 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
1067 " peripheral qualifier of 3, device not"
1068 " added\n"))
1069 if (lun == 0) {
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001070 SCSI_LOG_SCAN_BUS(1, {
1071 unsigned char vend[9];
1072 unsigned char mod[17];
1073
1074 sdev_printk(KERN_INFO, sdev,
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001075 "scsi scan: consider passing scsi_mod."
Kurt Garloff3424a652007-01-09 02:28:54 +01001076 "dev_flags=%s:%s:0x240 or 0x1000240\n",
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001077 scsi_inq_str(vend, result, 8, 16),
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001078 scsi_inq_str(mod, result, 16, 32));
1079 });
James Bottomley643eb2d2008-03-22 22:42:27 -05001080
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001081 }
James Bottomley643eb2d2008-03-22 22:42:27 -05001082
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 res = SCSI_SCAN_TARGET_PRESENT;
1084 goto out_free_result;
1085 }
1086
Alan Stern1bfc5d92006-02-09 15:26:18 -05001087 /*
dave wysochanski84961f22006-08-09 14:56:32 -04001088 * Some targets may set slight variations of PQ and PDT to signal
1089 * that no LUN is present, so don't add sdev in these cases.
1090 * Two specific examples are:
1091 * 1) NetApp targets: return PQ=1, PDT=0x1f
1092 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1093 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1094 *
1095 * References:
1096 * 1) SCSI SPC-3, pp. 145-146
1097 * PQ=1: "A peripheral device having the specified peripheral
1098 * device type is not connected to this logical unit. However, the
1099 * device server is capable of supporting the specified peripheral
1100 * device type on this logical unit."
1101 * PDT=0x1f: "Unknown or no device type"
1102 * 2) USB UFI 1.0, p. 20
1103 * PDT=00h Direct-access device (floppy)
1104 * PDT=1Fh none (no FDD connected to the requested logical unit)
Alan Stern1bfc5d92006-02-09 15:26:18 -05001105 */
dave wysochanski84961f22006-08-09 14:56:32 -04001106 if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) &&
James Bottomley01b291b2008-08-21 15:14:14 -05001107 (result[0] & 0x1f) == 0x1f &&
1108 !scsi_is_wlun(lun)) {
Alan Stern1bfc5d92006-02-09 15:26:18 -05001109 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1110 "scsi scan: peripheral device type"
1111 " of 31, no device added\n"));
1112 res = SCSI_SCAN_TARGET_PRESENT;
1113 goto out_free_result;
1114 }
1115
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001116 res = scsi_add_lun(sdev, result, &bflags, shost->async_scan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 if (res == SCSI_SCAN_LUN_PRESENT) {
1118 if (bflags & BLIST_KEY) {
1119 sdev->lockable = 0;
James Bottomley39216032005-06-15 18:48:29 -05001120 scsi_unlock_floptical(sdev, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 }
1123
1124 out_free_result:
1125 kfree(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 out_free_sdev:
1127 if (res == SCSI_SCAN_LUN_PRESENT) {
1128 if (sdevp) {
Alan Sternb70d37b2005-07-26 10:30:40 -04001129 if (scsi_device_get(sdev) == 0) {
1130 *sdevp = sdev;
1131 } else {
1132 __scsi_remove_device(sdev);
1133 res = SCSI_SCAN_NO_RESPONSE;
1134 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001136 } else
James Bottomley860dc732009-11-19 17:48:29 -05001137 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 out:
1139 return res;
1140}
1141
1142/**
1143 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1144 * @starget: pointer to target structure to scan
1145 * @bflags: black/white list flag for LUN 0
Rob Landleyeb448202007-11-03 13:30:39 -05001146 * @scsi_level: Which version of the standard does this device adhere to
1147 * @rescan: passed to scsi_probe_add_lun()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 *
1149 * Description:
1150 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1151 * scanned) to some maximum lun until a LUN is found with no device
1152 * attached. Use the bflags to figure out any oddities.
1153 *
1154 * Modifies sdevscan->lun.
1155 **/
1156static void scsi_sequential_lun_scan(struct scsi_target *starget,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001157 int bflags, int scsi_level, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158{
1159 unsigned int sparse_lun, lun, max_dev_lun;
1160 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1161
1162 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of"
Kay Sievers71610f52008-12-03 22:41:36 +01001163 "%s\n", dev_name(&starget->dev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164
1165 max_dev_lun = min(max_scsi_luns, shost->max_lun);
1166 /*
1167 * If this device is known to support sparse multiple units,
1168 * override the other settings, and scan all of them. Normally,
1169 * SCSI-3 devices should be scanned via the REPORT LUNS.
1170 */
1171 if (bflags & BLIST_SPARSELUN) {
1172 max_dev_lun = shost->max_lun;
1173 sparse_lun = 1;
1174 } else
1175 sparse_lun = 0;
1176
1177 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178 * If less than SCSI_1_CSS, and no special lun scaning, stop
1179 * scanning; this matches 2.4 behaviour, but could just be a bug
1180 * (to continue scanning a SCSI_1_CSS device).
1181 *
1182 * This test is broken. We might not have any device on lun0 for
1183 * a sparselun device, and if that's the case then how would we
1184 * know the real scsi_level, eh? It might make sense to just not
1185 * scan any SCSI_1 device for non-0 luns, but that check would best
1186 * go into scsi_alloc_sdev() and just have it return null when asked
1187 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1188 *
1189 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1190 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1191 == 0))
1192 return;
1193 */
1194 /*
1195 * If this device is known to support multiple units, override
1196 * the other settings, and scan all of them.
1197 */
1198 if (bflags & BLIST_FORCELUN)
1199 max_dev_lun = shost->max_lun;
1200 /*
1201 * REGAL CDC-4X: avoid hang after LUN 4
1202 */
1203 if (bflags & BLIST_MAX5LUN)
1204 max_dev_lun = min(5U, max_dev_lun);
1205 /*
1206 * Do not scan SCSI-2 or lower device past LUN 7, unless
1207 * BLIST_LARGELUN.
1208 */
1209 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
1210 max_dev_lun = min(8U, max_dev_lun);
1211
1212 /*
1213 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1214 * until we reach the max, or no LUN is found and we are not
1215 * sparse_lun.
1216 */
1217 for (lun = 1; lun < max_dev_lun; ++lun)
1218 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
1219 NULL) != SCSI_SCAN_LUN_PRESENT) &&
1220 !sparse_lun)
1221 return;
1222}
1223
1224/**
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001225 * scsilun_to_int - convert a scsi_lun to an int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 * @scsilun: struct scsi_lun to be converted.
1227 *
1228 * Description:
1229 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1230 * integer, and return the result. The caller must check for
1231 * truncation before using this function.
1232 *
1233 * Notes:
1234 * The struct scsi_lun is assumed to be four levels, with each level
1235 * effectively containing a SCSI byte-ordered (big endian) short; the
1236 * addressing bits of each level are ignored (the highest two bits).
1237 * For a description of the LUN format, post SCSI-3 see the SCSI
1238 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1239 *
1240 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1241 * the integer: 0x0b030a04
1242 **/
Christof Schmitt462b7852007-06-19 10:25:30 +02001243int scsilun_to_int(struct scsi_lun *scsilun)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244{
1245 int i;
1246 unsigned int lun;
1247
1248 lun = 0;
1249 for (i = 0; i < sizeof(lun); i += 2)
1250 lun = lun | (((scsilun->scsi_lun[i] << 8) |
1251 scsilun->scsi_lun[i + 1]) << (i * 8));
1252 return lun;
1253}
Christof Schmitt462b7852007-06-19 10:25:30 +02001254EXPORT_SYMBOL(scsilun_to_int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255
1256/**
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001257 * int_to_scsilun - reverts an int into a scsi_lun
Rob Landleyeb448202007-11-03 13:30:39 -05001258 * @lun: integer to be reverted
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001259 * @scsilun: struct scsi_lun to be set.
1260 *
1261 * Description:
1262 * Reverts the functionality of the scsilun_to_int, which packed
1263 * an 8-byte lun value into an int. This routine unpacks the int
1264 * back into the lun value.
1265 * Note: the scsilun_to_int() routine does not truly handle all
1266 * 8bytes of the lun value. This functions restores only as much
1267 * as was set by the routine.
1268 *
1269 * Notes:
1270 * Given an integer : 0x0b030a04, this function returns a
1271 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1272 *
1273 **/
1274void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun)
1275{
1276 int i;
1277
1278 memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
1279
1280 for (i = 0; i < sizeof(lun); i += 2) {
1281 scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
1282 scsilun->scsi_lun[i+1] = lun & 0xFF;
1283 lun = lun >> 16;
1284 }
1285}
1286EXPORT_SYMBOL(int_to_scsilun);
1287
1288/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
Rob Landleyeb448202007-11-03 13:30:39 -05001290 * @starget: which target
1291 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1292 * @rescan: nonzero if we can skip code only needed on first scan
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293 *
1294 * Description:
Rob Landleyeb448202007-11-03 13:30:39 -05001295 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1296 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297 *
Rob Landleyeb448202007-11-03 13:30:39 -05001298 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1299 * LUNs even if it's older than SCSI-3.
1300 * If BLIST_NOREPORTLUN is set, return 1 always.
1301 * If BLIST_NOLUN is set, return 0 always.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302 *
1303 * Return:
1304 * 0: scan completed (or no memory, so further scanning is futile)
Rob Landleyeb448202007-11-03 13:30:39 -05001305 * 1: could not scan with REPORT LUN
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 **/
James Bottomley6f3a2022005-09-22 20:33:28 -05001307static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308 int rescan)
1309{
1310 char devname[64];
1311 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1312 unsigned int length;
1313 unsigned int lun;
1314 unsigned int num_luns;
1315 unsigned int retries;
James Bottomley39216032005-06-15 18:48:29 -05001316 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317 struct scsi_lun *lunp, *lun_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318 u8 *data;
1319 struct scsi_sense_hdr sshdr;
James Bottomley6f3a2022005-09-22 20:33:28 -05001320 struct scsi_device *sdev;
1321 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
Alan Stern2ef89192005-11-08 15:51:55 -05001322 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323
1324 /*
1325 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1326 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1327 * support more than 8 LUNs.
1328 */
James Bottomley4d7db042006-03-31 20:07:45 -06001329 if (bflags & BLIST_NOREPORTLUN)
1330 return 1;
1331 if (starget->scsi_level < SCSI_2 &&
1332 starget->scsi_level != SCSI_UNKNOWN)
1333 return 1;
1334 if (starget->scsi_level < SCSI_3 &&
1335 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 return 1;
1337 if (bflags & BLIST_NOLUN)
1338 return 0;
1339
James Bottomley6f3a2022005-09-22 20:33:28 -05001340 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1341 sdev = scsi_alloc_sdev(starget, 0, NULL);
1342 if (!sdev)
1343 return 0;
Alan Stern75f8ee82010-02-12 12:13:31 -05001344 if (scsi_device_get(sdev)) {
1345 __scsi_remove_device(sdev);
James Bottomley6f3a2022005-09-22 20:33:28 -05001346 return 0;
Alan Stern75f8ee82010-02-12 12:13:31 -05001347 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001348 }
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 */
James Bottomley860dc732009-11-19 17:48:29 -05001500 __scsi_remove_device(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);
Alan Sternbc4f2402010-06-17 10:41:42 -04001517 scsi_autopm_get_target(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518
Arjan van de Ven0b950672006-01-11 13:16:10 +01001519 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001520 if (!shost->async_scan)
1521 scsi_complete_async_scans();
1522
Alan Sternbc4f2402010-06-17 10:41:42 -04001523 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001524 scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
Alan Sternbc4f2402010-06-17 10:41:42 -04001525 scsi_autopm_put_host(shost);
1526 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001527 mutex_unlock(&shost->scan_mutex);
Alan Sternbc4f2402010-06-17 10:41:42 -04001528 scsi_autopm_put_target(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529 scsi_target_reap(starget);
1530 put_device(&starget->dev);
1531
1532 return sdev;
1533}
1534EXPORT_SYMBOL(__scsi_add_device);
1535
James Bottomley146f7262005-09-10 12:44:09 -05001536int scsi_add_device(struct Scsi_Host *host, uint channel,
1537 uint target, uint lun)
1538{
1539 struct scsi_device *sdev =
1540 __scsi_add_device(host, channel, target, lun, NULL);
1541 if (IS_ERR(sdev))
1542 return PTR_ERR(sdev);
1543
1544 scsi_device_put(sdev);
1545 return 0;
1546}
1547EXPORT_SYMBOL(scsi_add_device);
1548
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549void scsi_rescan_device(struct device *dev)
1550{
1551 struct scsi_driver *drv;
1552
1553 if (!dev->driver)
1554 return;
1555
1556 drv = to_scsi_driver(dev->driver);
1557 if (try_module_get(drv->owner)) {
1558 if (drv->rescan)
1559 drv->rescan(dev);
1560 module_put(drv->owner);
1561 }
1562}
1563EXPORT_SYMBOL(scsi_rescan_device);
1564
Alan Sterne517d312005-07-26 10:18:45 -04001565static void __scsi_scan_target(struct device *parent, unsigned int channel,
1566 unsigned int id, unsigned int lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567{
1568 struct Scsi_Host *shost = dev_to_shost(parent);
1569 int bflags = 0;
1570 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571 struct scsi_target *starget;
1572
1573 if (shost->this_id == id)
1574 /*
1575 * Don't scan the host adapter
1576 */
1577 return;
1578
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001580 if (!starget)
1581 return;
Alan Sternbc4f2402010-06-17 10:41:42 -04001582 scsi_autopm_get_target(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584 if (lun != SCAN_WILD_CARD) {
1585 /*
1586 * Scan for a specific host/chan/id/lun.
1587 */
1588 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1589 goto out_reap;
1590 }
1591
1592 /*
1593 * Scan LUN 0, if there is some response, scan further. Ideally, we
1594 * would not configure LUN 0 until all LUNs are scanned.
1595 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001596 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1597 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1598 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599 /*
1600 * The REPORT LUN did not scan the target,
1601 * do a sequential scan.
1602 */
1603 scsi_sequential_lun_scan(starget, bflags,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001604 starget->scsi_level, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606
1607 out_reap:
Alan Sternbc4f2402010-06-17 10:41:42 -04001608 scsi_autopm_put_target(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609 /* now determine if the target has any children at all
1610 * and if not, nuke it */
1611 scsi_target_reap(starget);
1612
1613 put_device(&starget->dev);
1614}
Alan Sterne517d312005-07-26 10:18:45 -04001615
1616/**
Randy Dunlape59e4a02008-02-29 22:02:50 -08001617 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
Alan Sterne517d312005-07-26 10:18:45 -04001618 * @parent: host to scan
1619 * @channel: channel to scan
1620 * @id: target id to scan
1621 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1622 * @rescan: passed to LUN scanning routines
1623 *
1624 * Description:
1625 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1626 * and possibly all LUNs on the target id.
1627 *
1628 * First try a REPORT LUN scan, if that does not scan the target, do a
1629 * sequential scan of LUNs on the target id.
1630 **/
1631void scsi_scan_target(struct device *parent, unsigned int channel,
1632 unsigned int id, unsigned int lun, int rescan)
1633{
1634 struct Scsi_Host *shost = dev_to_shost(parent);
1635
Matthew Wilcox93b45af2006-11-22 13:24:53 -07001636 if (strncmp(scsi_scan_type, "none", 4) == 0)
1637 return;
1638
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001639 mutex_lock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001640 if (!shost->async_scan)
1641 scsi_complete_async_scans();
1642
Alan Sternbc4f2402010-06-17 10:41:42 -04001643 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Alan Sterne517d312005-07-26 10:18:45 -04001644 __scsi_scan_target(parent, channel, id, lun, rescan);
Alan Sternbc4f2402010-06-17 10:41:42 -04001645 scsi_autopm_put_host(shost);
1646 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001647 mutex_unlock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001648}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649EXPORT_SYMBOL(scsi_scan_target);
1650
1651static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1652 unsigned int id, unsigned int lun, int rescan)
1653{
1654 uint order_id;
1655
1656 if (id == SCAN_WILD_CARD)
1657 for (id = 0; id < shost->max_id; ++id) {
1658 /*
1659 * XXX adapter drivers when possible (FCP, iSCSI)
1660 * could modify max_id to match the current max,
1661 * not the absolute max.
1662 *
1663 * XXX add a shost id iterator, so for example,
1664 * the FC ID can be the same as a target id
1665 * without a huge overhead of sparse id's.
1666 */
1667 if (shost->reverse_ordering)
1668 /*
1669 * Scan from high to low id.
1670 */
1671 order_id = shost->max_id - id - 1;
1672 else
1673 order_id = id;
Alan Sterne517d312005-07-26 10:18:45 -04001674 __scsi_scan_target(&shost->shost_gendev, channel,
1675 order_id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001676 }
1677 else
Alan Sterne517d312005-07-26 10:18:45 -04001678 __scsi_scan_target(&shost->shost_gendev, channel,
1679 id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001680}
1681
1682int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1683 unsigned int id, unsigned int lun, int rescan)
1684{
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001685 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
1686 "%s: <%u:%u:%u>\n",
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001687 __func__, channel, id, lun));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688
1689 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
Amit Arora091686d2006-05-19 16:14:50 -07001690 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1692 return -EINVAL;
1693
Arjan van de Ven0b950672006-01-11 13:16:10 +01001694 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001695 if (!shost->async_scan)
1696 scsi_complete_async_scans();
1697
Alan Sternbc4f2402010-06-17 10:41:42 -04001698 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Mike Anderson82f29462005-06-16 11:14:33 -07001699 if (channel == SCAN_WILD_CARD)
1700 for (channel = 0; channel <= shost->max_channel;
1701 channel++)
1702 scsi_scan_channel(shost, channel, id, lun,
1703 rescan);
1704 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705 scsi_scan_channel(shost, channel, id, lun, rescan);
Alan Sternbc4f2402010-06-17 10:41:42 -04001706 scsi_autopm_put_host(shost);
Mike Anderson82f29462005-06-16 11:14:33 -07001707 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001708 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709
1710 return 0;
1711}
1712
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001713static void scsi_sysfs_add_devices(struct Scsi_Host *shost)
1714{
1715 struct scsi_device *sdev;
1716 shost_for_each_device(sdev, shost) {
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001717 if (!scsi_host_scan_allowed(shost) ||
1718 scsi_sysfs_add_sdev(sdev) != 0)
James Bottomley860dc732009-11-19 17:48:29 -05001719 __scsi_remove_device(sdev);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001720 }
1721}
1722
1723/**
1724 * scsi_prep_async_scan - prepare for an async scan
1725 * @shost: the host which will be scanned
1726 * Returns: a cookie to be passed to scsi_finish_async_scan()
1727 *
1728 * Tells the midlayer this host is going to do an asynchronous scan.
1729 * It reserves the host's position in the scanning list and ensures
1730 * that other asynchronous scans started after this one won't affect the
1731 * ordering of the discovered devices.
1732 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001733static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001734{
1735 struct async_scan_data *data;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001736 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001737
1738 if (strncmp(scsi_scan_type, "sync", 4) == 0)
1739 return NULL;
1740
1741 if (shost->async_scan) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001742 printk("%s called twice for host %d", __func__,
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001743 shost->host_no);
1744 dump_stack();
1745 return NULL;
1746 }
1747
1748 data = kmalloc(sizeof(*data), GFP_KERNEL);
1749 if (!data)
1750 goto err;
1751 data->shost = scsi_host_get(shost);
1752 if (!data->shost)
1753 goto err;
1754 init_completion(&data->prev_finished);
1755
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001756 mutex_lock(&shost->scan_mutex);
1757 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001758 shost->async_scan = 1;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001759 spin_unlock_irqrestore(shost->host_lock, flags);
1760 mutex_unlock(&shost->scan_mutex);
1761
1762 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001763 if (list_empty(&scanning_hosts))
1764 complete(&data->prev_finished);
1765 list_add_tail(&data->list, &scanning_hosts);
1766 spin_unlock(&async_scan_lock);
1767
1768 return data;
1769
1770 err:
1771 kfree(data);
1772 return NULL;
1773}
1774
1775/**
1776 * scsi_finish_async_scan - asynchronous scan has finished
1777 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1778 *
1779 * All the devices currently attached to this host have been found.
1780 * This function announces all the devices it has found to the rest
1781 * of the system.
1782 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001783static void scsi_finish_async_scan(struct async_scan_data *data)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001784{
1785 struct Scsi_Host *shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001786 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001787
1788 if (!data)
1789 return;
1790
1791 shost = data->shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001792
1793 mutex_lock(&shost->scan_mutex);
1794
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001795 if (!shost->async_scan) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001796 printk("%s called twice for host %d", __func__,
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001797 shost->host_no);
1798 dump_stack();
Julia Lawall773e82f2008-07-21 09:58:30 +02001799 mutex_unlock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001800 return;
1801 }
1802
1803 wait_for_completion(&data->prev_finished);
1804
1805 scsi_sysfs_add_devices(shost);
1806
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001807 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001808 shost->async_scan = 0;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001809 spin_unlock_irqrestore(shost->host_lock, flags);
1810
1811 mutex_unlock(&shost->scan_mutex);
1812
1813 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001814 list_del(&data->list);
1815 if (!list_empty(&scanning_hosts)) {
1816 struct async_scan_data *next = list_entry(scanning_hosts.next,
1817 struct async_scan_data, list);
1818 complete(&next->prev_finished);
1819 }
1820 spin_unlock(&async_scan_lock);
1821
1822 scsi_host_put(shost);
1823 kfree(data);
1824}
1825
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001826static void do_scsi_scan_host(struct Scsi_Host *shost)
1827{
1828 if (shost->hostt->scan_finished) {
1829 unsigned long start = jiffies;
1830 if (shost->hostt->scan_start)
1831 shost->hostt->scan_start(shost);
1832
1833 while (!shost->hostt->scan_finished(shost, jiffies - start))
1834 msleep(10);
1835 } else {
1836 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1837 SCAN_WILD_CARD, 0);
1838 }
1839}
1840
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001841static int do_scan_async(void *_data)
1842{
1843 struct async_scan_data *data = _data;
Alan Sternbc4f2402010-06-17 10:41:42 -04001844 struct Scsi_Host *shost = data->shost;
1845
1846 do_scsi_scan_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001847 scsi_finish_async_scan(data);
Alan Sternbc4f2402010-06-17 10:41:42 -04001848 scsi_autopm_put_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001849 return 0;
1850}
1851
Linus Torvalds1da177e2005-04-16 15:20:36 -07001852/**
1853 * scsi_scan_host - scan the given adapter
1854 * @shost: adapter to scan
1855 **/
1856void scsi_scan_host(struct Scsi_Host *shost)
1857{
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001858 struct task_struct *p;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001859 struct async_scan_data *data;
1860
1861 if (strncmp(scsi_scan_type, "none", 4) == 0)
1862 return;
Alan Sternbc4f2402010-06-17 10:41:42 -04001863 if (scsi_autopm_get_host(shost) < 0)
1864 return;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001865
1866 data = scsi_prep_async_scan(shost);
1867 if (!data) {
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001868 do_scsi_scan_host(shost);
Alan Sternbc4f2402010-06-17 10:41:42 -04001869 scsi_autopm_put_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001870 return;
1871 }
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001872
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001873 p = kthread_run(do_scan_async, data, "scsi_scan_%d", shost->host_no);
Hirofumi Nakagawa801678c2008-04-29 01:03:09 -07001874 if (IS_ERR(p))
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001875 do_scan_async(data);
Alan Sternbc4f2402010-06-17 10:41:42 -04001876 /* scsi_autopm_put_host(shost) is called in do_scan_async() */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001877}
1878EXPORT_SYMBOL(scsi_scan_host);
1879
Linus Torvalds1da177e2005-04-16 15:20:36 -07001880void scsi_forget_host(struct Scsi_Host *shost)
1881{
Alan Sterna64358d2005-07-26 10:27:10 -04001882 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001883 unsigned long flags;
1884
Alan Sterna64358d2005-07-26 10:27:10 -04001885 restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001886 spin_lock_irqsave(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001887 list_for_each_entry(sdev, &shost->__devices, siblings) {
1888 if (sdev->sdev_state == SDEV_DEL)
1889 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890 spin_unlock_irqrestore(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001891 __scsi_remove_device(sdev);
1892 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893 }
1894 spin_unlock_irqrestore(shost->host_lock, flags);
1895}
1896
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001897/**
1898 * scsi_get_host_dev - Create a scsi_device that points to the host adapter itself
1899 * @shost: Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001900 *
1901 * Lock status: None assumed.
1902 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001903 * Returns: The scsi_device or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904 *
1905 * Notes:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001906 * Attach a single scsi_device to the Scsi_Host - this should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001907 * be made to look like a "pseudo-device" that points to the
1908 * HA itself.
1909 *
1910 * Note - this device is not accessible from any high-level
1911 * drivers (including generics), which is probably not
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001912 * optimal. We can add hooks later to attach.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913 */
1914struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1915{
Alan Sterne517d312005-07-26 10:18:45 -04001916 struct scsi_device *sdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001917 struct scsi_target *starget;
1918
Arjan van de Ven0b950672006-01-11 13:16:10 +01001919 mutex_lock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001920 if (!scsi_host_scan_allowed(shost))
1921 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1923 if (!starget)
Alan Sterne517d312005-07-26 10:18:45 -04001924 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925
1926 sdev = scsi_alloc_sdev(starget, 0, NULL);
Alan Sternd5469112010-02-12 12:13:39 -05001927 if (sdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001928 sdev->borken = 0;
Alan Sternd5469112010-02-12 12:13:39 -05001929 else
James Bottomley884d25c2006-09-05 16:26:41 -05001930 scsi_target_reap(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931 put_device(&starget->dev);
Alan Sterne517d312005-07-26 10:18:45 -04001932 out:
Arjan van de Ven0b950672006-01-11 13:16:10 +01001933 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001934 return sdev;
1935}
1936EXPORT_SYMBOL(scsi_get_host_dev);
1937
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001938/**
1939 * scsi_free_host_dev - Free a scsi_device that points to the host adapter itself
1940 * @sdev: Host device to be freed
Linus Torvalds1da177e2005-04-16 15:20:36 -07001941 *
1942 * Lock status: None assumed.
1943 *
1944 * Returns: Nothing
Linus Torvalds1da177e2005-04-16 15:20:36 -07001945 */
1946void scsi_free_host_dev(struct scsi_device *sdev)
1947{
1948 BUG_ON(sdev->id != sdev->host->this_id);
1949
James Bottomley860dc732009-11-19 17:48:29 -05001950 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951}
1952EXPORT_SYMBOL(scsi_free_host_dev);
1953