blob: c992ecf4e37206a6f28fe8a33787b5cf1b3267cb [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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
Jes Sorensen24669f752006-01-16 10:31:18 -0500246 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 GFP_ATOMIC);
248 if (!sdev)
249 goto out;
250
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 sdev->vendor = scsi_null_device_strs;
252 sdev->model = scsi_null_device_strs;
253 sdev->rev = scsi_null_device_strs;
254 sdev->host = shost;
Vasu Dev4a840672009-10-22 15:46:33 -0700255 sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 sdev->id = starget->id;
257 sdev->lun = lun;
258 sdev->channel = starget->channel;
259 sdev->sdev_state = SDEV_CREATED;
260 INIT_LIST_HEAD(&sdev->siblings);
261 INIT_LIST_HEAD(&sdev->same_target_siblings);
262 INIT_LIST_HEAD(&sdev->cmd_list);
263 INIT_LIST_HEAD(&sdev->starved_entry);
Jeff Garzika341cd02007-10-29 17:15:22 -0400264 INIT_LIST_HEAD(&sdev->event_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 spin_lock_init(&sdev->list_lock);
Jeff Garzika341cd02007-10-29 17:15:22 -0400266 INIT_WORK(&sdev->event_work, scsi_evt_thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
268 sdev->sdev_gendev.parent = get_device(&starget->dev);
269 sdev->sdev_target = starget;
270
271 /* usually NULL and set by ->slave_alloc instead */
272 sdev->hostdata = hostdata;
273
274 /* if the device needs this changing, it may do so in the
275 * slave_configure function */
276 sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
277
278 /*
279 * Some low level driver could use device->type
280 */
281 sdev->type = -1;
282
283 /*
284 * Assume that the device will have handshaking problems,
285 * and then fix this field later if it turns out it
286 * doesn't
287 */
288 sdev->borken = 1;
289
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 sdev->request_queue = scsi_alloc_queue(sdev);
291 if (!sdev->request_queue) {
292 /* release fn is set up in scsi_sysfs_device_initialise, so
293 * have to free and put manually here */
294 put_device(&starget->dev);
Dave Jones93f560892006-03-09 10:21:27 -0500295 kfree(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 goto out;
297 }
298
299 sdev->request_queue->queuedata = sdev;
300 scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
301
302 scsi_sysfs_device_initialize(sdev);
303
304 if (shost->hostt->slave_alloc) {
305 ret = shost->hostt->slave_alloc(sdev);
306 if (ret) {
307 /*
308 * if LLDD reports slave not present, don't clutter
309 * console with alloc failure messages
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 */
311 if (ret == -ENXIO)
312 display_failure_msg = 0;
313 goto out_device_destroy;
314 }
315 }
316
317 return sdev;
318
319out_device_destroy:
James Smartc2f9e492009-01-27 11:41:36 -0500320 scsi_device_set_state(sdev, SDEV_DEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 transport_destroy_device(&sdev->sdev_gendev);
James Bottomley37e6ba02009-10-02 13:30:08 -0500322 put_device(&sdev->sdev_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 put_device(&sdev->sdev_gendev);
324out:
325 if (display_failure_msg)
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700326 printk(ALLOC_FAILURE_MSG, __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 return NULL;
328}
329
James Bottomley643eb2d2008-03-22 22:42:27 -0500330static void scsi_target_destroy(struct scsi_target *starget)
331{
332 struct device *dev = &starget->dev;
333 struct Scsi_Host *shost = dev_to_shost(dev->parent);
334 unsigned long flags;
335
336 transport_destroy_device(dev);
337 spin_lock_irqsave(shost->host_lock, flags);
338 if (shost->hostt->target_destroy)
339 shost->hostt->target_destroy(starget);
340 list_del_init(&starget->siblings);
341 spin_unlock_irqrestore(shost->host_lock, flags);
342 put_device(dev);
343}
344
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345static void scsi_target_dev_release(struct device *dev)
346{
347 struct device *parent = dev->parent;
348 struct scsi_target *starget = to_scsi_target(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500349
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 kfree(starget);
351 put_device(parent);
352}
353
Adrian Bunk453cd0f2008-07-03 23:47:33 -0700354static struct device_type scsi_target_type = {
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100355 .name = "scsi_target",
356 .release = scsi_target_dev_release,
357};
358
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359int scsi_is_target_device(const struct device *dev)
360{
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100361 return dev->type == &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362}
363EXPORT_SYMBOL(scsi_is_target_device);
364
365static struct scsi_target *__scsi_find_target(struct device *parent,
366 int channel, uint id)
367{
368 struct scsi_target *starget, *found_starget = NULL;
369 struct Scsi_Host *shost = dev_to_shost(parent);
370 /*
371 * Search for an existing target for this sdev.
372 */
373 list_for_each_entry(starget, &shost->__targets, siblings) {
374 if (starget->id == id &&
375 starget->channel == channel) {
376 found_starget = starget;
377 break;
378 }
379 }
380 if (found_starget)
381 get_device(&found_starget->dev);
382
383 return found_starget;
384}
385
James Bottomley884d25c2006-09-05 16:26:41 -0500386/**
387 * scsi_alloc_target - allocate a new or find an existing target
388 * @parent: parent of the target (need not be a scsi host)
389 * @channel: target channel number (zero if no channels)
390 * @id: target id number
391 *
392 * Return an existing target if one exists, provided it hasn't already
393 * gone into STARGET_DEL state, otherwise allocate a new target.
394 *
395 * The target is returned with an incremented reference, so the caller
396 * is responsible for both reaping and doing a last put
397 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398static struct scsi_target *scsi_alloc_target(struct device *parent,
399 int channel, uint id)
400{
401 struct Scsi_Host *shost = dev_to_shost(parent);
402 struct device *dev = NULL;
403 unsigned long flags;
404 const int size = sizeof(struct scsi_target)
405 + shost->transportt->target_size;
James.Smart@Emulex.Com5c44cd22005-06-10 22:24:30 -0400406 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 struct scsi_target *found_target;
Brian King32f95792006-02-22 14:28:24 -0600408 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
Jes Sorensen24669f752006-01-16 10:31:18 -0500410 starget = kzalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 if (!starget) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700412 printk(KERN_ERR "%s: allocation failure\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 return NULL;
414 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 dev = &starget->dev;
416 device_initialize(dev);
417 starget->reap_ref = 1;
418 dev->parent = get_device(parent);
Kay Sievers71610f52008-12-03 22:41:36 +0100419 dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id);
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100420#ifndef CONFIG_SYSFS_DEPRECATED
421 dev->bus = &scsi_bus_type;
422#endif
423 dev->type = &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 starget->id = id;
425 starget->channel = channel;
Mike Christief0c0a372008-08-17 15:24:38 -0500426 starget->can_queue = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 INIT_LIST_HEAD(&starget->siblings);
428 INIT_LIST_HEAD(&starget->devices);
James Bottomley643eb2d2008-03-22 22:42:27 -0500429 starget->state = STARGET_CREATED;
Alan Stern7c9d6f12007-01-08 11:12:32 -0500430 starget->scsi_level = SCSI_2;
Edward Gogginc53a2842009-04-09 10:02:22 -0700431 starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED;
James Bottomleyffedb452006-02-23 14:27:18 -0600432 retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 spin_lock_irqsave(shost->host_lock, flags);
434
435 found_target = __scsi_find_target(parent, channel, id);
436 if (found_target)
437 goto found;
438
439 list_add_tail(&starget->siblings, &shost->__targets);
440 spin_unlock_irqrestore(shost->host_lock, flags);
441 /* allocate and add */
James Bottomleya283bd32005-05-24 12:06:38 -0500442 transport_setup_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500443 if (shost->hostt->target_alloc) {
Brian King32f95792006-02-22 14:28:24 -0600444 error = shost->hostt->target_alloc(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500445
446 if(error) {
447 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
448 /* don't want scsi_target_reap to do the final
449 * put because it will be under the host lock */
James Bottomley643eb2d2008-03-22 22:42:27 -0500450 scsi_target_destroy(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500451 return NULL;
452 }
453 }
James Bottomley884d25c2006-09-05 16:26:41 -0500454 get_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500455
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 return starget;
457
458 found:
459 found_target->reap_ref++;
460 spin_unlock_irqrestore(shost->host_lock, flags);
James Bottomleyffedb452006-02-23 14:27:18 -0600461 if (found_target->state != STARGET_DEL) {
Alan Stern12fb8c12010-03-18 15:41:22 -0400462 put_device(dev);
James Bottomleyffedb452006-02-23 14:27:18 -0600463 return found_target;
464 }
465 /* Unfortunately, we found a dying target; need to
466 * wait until it's dead before we can get a new one */
467 put_device(&found_target->dev);
468 flush_scheduled_work();
469 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470}
471
David Howells65f27f32006-11-22 14:55:48 +0000472static void scsi_target_reap_usercontext(struct work_struct *work)
James Bottomley65110b22006-02-14 10:48:46 -0600473{
David Howells65f27f32006-11-22 14:55:48 +0000474 struct scsi_target *starget =
475 container_of(work, struct scsi_target, ew.work);
James Bottomley863a9302005-12-15 20:01:43 -0800476
James Bottomleyffedb452006-02-23 14:27:18 -0600477 transport_remove_device(&starget->dev);
478 device_del(&starget->dev);
James Bottomley643eb2d2008-03-22 22:42:27 -0500479 scsi_target_destroy(starget);
James Bottomley863a9302005-12-15 20:01:43 -0800480}
481
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482/**
483 * scsi_target_reap - check to see if target is in use and destroy if not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 * @starget: target to be checked
485 *
486 * This is used after removing a LUN or doing a last put of the target
487 * it checks atomically that nothing is using the target and removes
488 * it if so.
489 */
490void scsi_target_reap(struct scsi_target *starget)
491{
James Bottomleyffedb452006-02-23 14:27:18 -0600492 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
493 unsigned long flags;
James Bottomley643eb2d2008-03-22 22:42:27 -0500494 enum scsi_target_state state;
495 int empty;
James Bottomleyffedb452006-02-23 14:27:18 -0600496
497 spin_lock_irqsave(shost->host_lock, flags);
James Bottomley643eb2d2008-03-22 22:42:27 -0500498 state = starget->state;
499 empty = --starget->reap_ref == 0 &&
500 list_empty(&starget->devices) ? 1 : 0;
James Bottomleyffedb452006-02-23 14:27:18 -0600501 spin_unlock_irqrestore(shost->host_lock, flags);
502
James Bottomley643eb2d2008-03-22 22:42:27 -0500503 if (!empty)
504 return;
505
506 BUG_ON(state == STARGET_DEL);
507 starget->state = STARGET_DEL;
508 if (state == STARGET_CREATED)
509 scsi_target_destroy(starget);
510 else
511 execute_in_process_context(scsi_target_reap_usercontext,
512 &starget->ew);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513}
514
515/**
Alan Sterne5b3cd42006-08-21 15:53:25 -0400516 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
517 * @s: INQUIRY result string to sanitize
518 * @len: length of the string
519 *
520 * Description:
521 * The SCSI spec says that INQUIRY vendor, product, and revision
522 * strings must consist entirely of graphic ASCII characters,
523 * padded on the right with spaces. Since not all devices obey
524 * this rule, we will replace non-graphic or non-ASCII characters
525 * with spaces. Exception: a NUL character is interpreted as a
526 * string terminator, so all the following characters are set to
527 * spaces.
528 **/
529static void sanitize_inquiry_string(unsigned char *s, int len)
530{
531 int terminated = 0;
532
533 for (; len > 0; (--len, ++s)) {
534 if (*s == 0)
535 terminated = 1;
536 if (terminated || *s < 0x20 || *s > 0x7e)
537 *s = ' ';
538 }
539}
540
541/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
James Bottomley39216032005-06-15 18:48:29 -0500543 * @sdev: scsi_device to probe
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 * @inq_result: area to store the INQUIRY result
James Bottomley39216032005-06-15 18:48:29 -0500545 * @result_len: len of inq_result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 * @bflags: store any bflags found here
547 *
548 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500549 * Probe the lun associated with @req using a standard SCSI INQUIRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 *
James Bottomley39216032005-06-15 18:48:29 -0500551 * If the INQUIRY is successful, zero is returned and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100553 * are copied to the scsi_device any flags value is stored in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400555static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
James Bottomley39216032005-06-15 18:48:29 -0500556 int result_len, int *bflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
559 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
560 int response_len = 0;
James Bottomley39216032005-06-15 18:48:29 -0500561 int pass, count, result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 struct scsi_sense_hdr sshdr;
563
564 *bflags = 0;
565
566 /* Perform up to 3 passes. The first pass uses a conservative
567 * transfer length of 36 unless sdev->inquiry_len specifies a
568 * different value. */
569 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
570 try_inquiry_len = first_inquiry_len;
571 pass = 1;
572
573 next_pass:
James Bottomley9ccfc752005-10-02 11:45:08 -0500574 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
575 "scsi scan: INQUIRY pass %d length %d\n",
576 pass, try_inquiry_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
578 /* Each pass gets up to three chances to ignore Unit Attention */
579 for (count = 0; count < 3; ++count) {
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900580 int resid;
581
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 memset(scsi_cmd, 0, 6);
583 scsi_cmd[0] = INQUIRY;
584 scsi_cmd[4] = (unsigned char) try_inquiry_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
586 memset(inq_result, 0, try_inquiry_len);
James Bottomley39216032005-06-15 18:48:29 -0500587
588 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -0500589 inq_result, try_inquiry_len, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900590 HZ / 2 + HZ * scsi_inq_timeout, 3,
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900591 &resid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592
593 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
594 "with code 0x%x\n",
James Bottomley39216032005-06-15 18:48:29 -0500595 result ? "failed" : "successful", result));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
James Bottomley39216032005-06-15 18:48:29 -0500597 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 /*
599 * not-ready to ready transition [asc/ascq=0x28/0x0]
600 * or power-on, reset [asc/ascq=0x29/0x0], continue.
601 * INQUIRY should not yield UNIT_ATTENTION
602 * but many buggy devices do so anyway.
603 */
James Bottomley39216032005-06-15 18:48:29 -0500604 if ((driver_byte(result) & DRIVER_SENSE) &&
James Bottomleyea73a9f2005-08-28 11:33:52 -0500605 scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 if ((sshdr.sense_key == UNIT_ATTENTION) &&
607 ((sshdr.asc == 0x28) ||
608 (sshdr.asc == 0x29)) &&
609 (sshdr.ascq == 0))
610 continue;
611 }
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900612 } else {
613 /*
614 * if nothing was transferred, we try
615 * again. It's a workaround for some USB
616 * devices.
617 */
618 if (resid == try_inquiry_len)
619 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 }
621 break;
622 }
623
James Bottomley39216032005-06-15 18:48:29 -0500624 if (result == 0) {
Alan Sterne5b3cd42006-08-21 15:53:25 -0400625 sanitize_inquiry_string(&inq_result[8], 8);
626 sanitize_inquiry_string(&inq_result[16], 16);
627 sanitize_inquiry_string(&inq_result[32], 4);
628
629 response_len = inq_result[4] + 5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 if (response_len > 255)
631 response_len = first_inquiry_len; /* sanity */
632
633 /*
634 * Get any flags for this device.
635 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100636 * XXX add a bflags to scsi_device, and replace the
637 * corresponding bit fields in scsi_device, so bflags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 * need not be passed as an argument.
639 */
640 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
641 &inq_result[16]);
642
643 /* When the first pass succeeds we gain information about
644 * what larger transfer lengths might work. */
645 if (pass == 1) {
646 if (BLIST_INQUIRY_36 & *bflags)
647 next_inquiry_len = 36;
648 else if (BLIST_INQUIRY_58 & *bflags)
649 next_inquiry_len = 58;
650 else if (sdev->inquiry_len)
651 next_inquiry_len = sdev->inquiry_len;
652 else
653 next_inquiry_len = response_len;
654
655 /* If more data is available perform the second pass */
656 if (next_inquiry_len > try_inquiry_len) {
657 try_inquiry_len = next_inquiry_len;
658 pass = 2;
659 goto next_pass;
660 }
661 }
662
663 } else if (pass == 2) {
664 printk(KERN_INFO "scsi scan: %d byte inquiry failed. "
665 "Consider BLIST_INQUIRY_36 for this device\n",
666 try_inquiry_len);
667
668 /* If this pass failed, the third pass goes back and transfers
669 * the same amount as we successfully got in the first pass. */
670 try_inquiry_len = first_inquiry_len;
671 pass = 3;
672 goto next_pass;
673 }
674
675 /* If the last transfer attempt got an error, assume the
676 * peripheral doesn't exist or is dead. */
James Bottomley39216032005-06-15 18:48:29 -0500677 if (result)
678 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679
680 /* Don't report any more data than the device says is valid */
681 sdev->inquiry_len = min(try_inquiry_len, response_len);
682
683 /*
684 * XXX Abort if the response length is less than 36? If less than
685 * 32, the lookup of the device flags (above) could be invalid,
686 * and it would be possible to take an incorrect action - we do
687 * not want to hang because of a short INQUIRY. On the flip side,
688 * if the device is spun down or becoming ready (and so it gives a
689 * short INQUIRY), an abort here prevents any further use of the
690 * device, including spin up.
691 *
Alan Sterne423ee32007-02-16 01:46:38 -0800692 * On the whole, the best approach seems to be to assume the first
693 * 36 bytes are valid no matter what the device says. That's
694 * better than copying < 36 bytes to the inquiry-result buffer
695 * and displaying garbage for the Vendor, Product, or Revision
696 * strings.
697 */
698 if (sdev->inquiry_len < 36) {
699 printk(KERN_INFO "scsi scan: INQUIRY result too short (%d),"
700 " using 36\n", sdev->inquiry_len);
701 sdev->inquiry_len = 36;
702 }
703
704 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 * Related to the above issue:
706 *
707 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
708 * and if not ready, sent a START_STOP to start (maybe spin up) and
709 * then send the INQUIRY again, since the INQUIRY can change after
710 * a device is initialized.
711 *
712 * Ideally, start a device if explicitly asked to do so. This
713 * assumes that a device is spun up on power on, spun down on
714 * request, and then spun up on request.
715 */
716
717 /*
718 * The scanning code needs to know the scsi_level, even if no
719 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
720 * non-zero LUNs can be scanned.
721 */
722 sdev->scsi_level = inq_result[2] & 0x07;
723 if (sdev->scsi_level >= 2 ||
724 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
725 sdev->scsi_level++;
James Bottomley6f3a2022005-09-22 20:33:28 -0500726 sdev->sdev_target->scsi_level = sdev->scsi_level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727
James Bottomley39216032005-06-15 18:48:29 -0500728 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729}
730
731/**
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100732 * scsi_add_lun - allocate and fully initialze a scsi_device
Matthew Wilcox6d877682007-07-11 12:54:55 -0600733 * @sdev: holds information to be stored in the new scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 * @inq_result: holds the result of a previous INQUIRY to the LUN
735 * @bflags: black/white list flag
Matthew Wilcox6d877682007-07-11 12:54:55 -0600736 * @async: 1 if this device is being scanned asynchronously
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 *
738 * Description:
Matthew Wilcox6d877682007-07-11 12:54:55 -0600739 * Initialize the scsi_device @sdev. Optionally set fields based
740 * on values in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 *
742 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100743 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
744 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400746static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600747 int *bflags, int async)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748{
James Bottomley6f4267e2008-08-22 16:53:31 -0500749 int ret;
750
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 /*
752 * XXX do not save the inquiry, since it can change underneath us,
753 * save just vendor/model/rev.
754 *
755 * Rather than save it and have an ioctl that retrieves the saved
756 * value, have an ioctl that executes the same INQUIRY code used
757 * in scsi_probe_lun, let user level programs doing INQUIRY
758 * scanning run at their own risk, or supply a user level program
759 * that can correctly scan.
760 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761
Alan Stern09123d22006-11-10 12:27:57 -0800762 /*
763 * Copy at least 36 bytes of INQUIRY data, so that we don't
764 * dereference unallocated memory when accessing the Vendor,
765 * Product, and Revision strings. Badly behaved devices may set
766 * the INQUIRY Additional Length byte to a small value, indicating
767 * these strings are invalid, but often they contain plausible data
768 * nonetheless. It doesn't matter if the device sent < 36 bytes
769 * total, since scsi_probe_lun() initializes inq_result with 0s.
770 */
771 sdev->inquiry = kmemdup(inq_result,
772 max_t(size_t, sdev->inquiry_len, 36),
773 GFP_ATOMIC);
774 if (sdev->inquiry == NULL)
775 return SCSI_SCAN_NO_RESPONSE;
776
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 sdev->vendor = (char *) (sdev->inquiry + 8);
778 sdev->model = (char *) (sdev->inquiry + 16);
779 sdev->rev = (char *) (sdev->inquiry + 32);
780
781 if (*bflags & BLIST_ISROM) {
Matthew Wilcox6d877682007-07-11 12:54:55 -0600782 sdev->type = TYPE_ROM;
783 sdev->removable = 1;
784 } else {
785 sdev->type = (inq_result[0] & 0x1f);
786 sdev->removable = (inq_result[1] & 0x80) >> 7;
787 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788
Matthew Wilcox6d877682007-07-11 12:54:55 -0600789 switch (sdev->type) {
James Bottomleyddaf6fc2006-12-13 10:10:40 -0600790 case TYPE_RBC:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 case TYPE_TAPE:
792 case TYPE_DISK:
793 case TYPE_PRINTER:
794 case TYPE_MOD:
795 case TYPE_PROCESSOR:
796 case TYPE_SCANNER:
797 case TYPE_MEDIUM_CHANGER:
798 case TYPE_ENCLOSURE:
799 case TYPE_COMM:
James Bottomley4d7db042006-03-31 20:07:45 -0600800 case TYPE_RAID:
Boaz Harrosh82443a52009-01-25 16:51:33 +0200801 case TYPE_OSD:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 sdev->writeable = 1;
803 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 case TYPE_ROM:
James Bottomleyddaf6fc2006-12-13 10:10:40 -0600805 case TYPE_WORM:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 sdev->writeable = 0;
807 break;
808 default:
809 printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type);
810 }
811
Matthew Wilcox6d877682007-07-11 12:54:55 -0600812 if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {
813 /* RBC and MMC devices can return SCSI-3 compliance and yet
814 * still not support REPORT LUNS, so make them act as
815 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
816 * specifically set */
817 if ((*bflags & BLIST_REPORTLUN2) == 0)
818 *bflags |= BLIST_NOREPORTLUN;
819 }
820
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 /*
822 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
823 * spec says: The device server is capable of supporting the
824 * specified peripheral device type on this logical unit. However,
825 * the physical device is not currently connected to this logical
826 * unit.
827 *
828 * The above is vague, as it implies that we could treat 001 and
829 * 011 the same. Stay compatible with previous code, and create a
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100830 * scsi_device for a PQ of 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 *
832 * Don't set the device offline here; rather let the upper
833 * level drivers eval the PQ to decide whether they should
834 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
835 */
836
837 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 sdev->lockable = sdev->removable;
839 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
840
Matthew Wilcox6d877682007-07-11 12:54:55 -0600841 if (sdev->scsi_level >= SCSI_3 ||
842 (sdev->inquiry_len > 56 && inq_result[56] & 0x04))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 sdev->ppr = 1;
844 if (inq_result[7] & 0x60)
845 sdev->wdtr = 1;
846 if (inq_result[7] & 0x10)
847 sdev->sdtr = 1;
848
James Bottomley19ac0db2006-08-06 18:15:22 -0500849 sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d "
Matthew Wilcox4ff36712006-07-04 12:15:20 -0600850 "ANSI: %d%s\n", scsi_device_type(sdev->type),
851 sdev->vendor, sdev->model, sdev->rev,
852 sdev->inq_periph_qual, inq_result[2] & 0x07,
853 (inq_result[3] & 0x0f) == 1 ? " CCS" : "");
854
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
856 !(*bflags & BLIST_NOTQ))
857 sdev->tagged_supported = 1;
Matthew Wilcox6d877682007-07-11 12:54:55 -0600858
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 /*
860 * Some devices (Texel CD ROM drives) have handshaking problems
861 * when used with the Seagate controllers. borken is initialized
862 * to 1, and then set it to 0 here.
863 */
864 if ((*bflags & BLIST_BORKEN) == 0)
865 sdev->borken = 0;
866
Matthew Wilcox6d877682007-07-11 12:54:55 -0600867 if (*bflags & BLIST_NO_ULD_ATTACH)
868 sdev->no_uld_attach = 1;
869
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 /*
871 * Apparently some really broken devices (contrary to the SCSI
872 * standards) need to be selected without asserting ATN
873 */
874 if (*bflags & BLIST_SELECT_NO_ATN)
875 sdev->select_no_atn = 1;
876
877 /*
James Bottomley4d7db042006-03-31 20:07:45 -0600878 * Maximum 512 sector transfer length
879 * broken RA4x00 Compaq Disk Array
880 */
881 if (*bflags & BLIST_MAX_512)
Martin K. Petersen086fa5f2010-02-26 00:20:38 -0500882 blk_queue_max_hw_sectors(sdev->request_queue, 512);
James Bottomley4d7db042006-03-31 20:07:45 -0600883
884 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 * Some devices may not want to have a start command automatically
886 * issued when a device is added.
887 */
888 if (*bflags & BLIST_NOSTARTONADD)
889 sdev->no_start_on_add = 1;
890
891 if (*bflags & BLIST_SINGLELUN)
Tony Battersby25d7c362007-11-12 10:00:44 -0500892 scsi_target(sdev)->single_lun = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 sdev->use_10_for_rw = 1;
895
896 if (*bflags & BLIST_MS_SKIP_PAGE_08)
897 sdev->skip_ms_page_8 = 1;
898
899 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
900 sdev->skip_ms_page_3f = 1;
901
902 if (*bflags & BLIST_USE_10_BYTE_MS)
903 sdev->use_10_for_ms = 1;
904
905 /* set the device running here so that slave configure
906 * may do I/O */
James Bottomley6f4267e2008-08-22 16:53:31 -0500907 ret = scsi_device_set_state(sdev, SDEV_RUNNING);
908 if (ret) {
909 ret = scsi_device_set_state(sdev, SDEV_BLOCK);
910
911 if (ret) {
912 sdev_printk(KERN_ERR, sdev,
913 "in wrong state %s to complete scan\n",
914 scsi_device_state_name(sdev->sdev_state));
915 return SCSI_SCAN_NO_RESPONSE;
916 }
917 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918
919 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
920 sdev->use_192_bytes_for_3f = 1;
921
922 if (*bflags & BLIST_NOT_LOCKABLE)
923 sdev->lockable = 0;
924
925 if (*bflags & BLIST_RETRY_HWERROR)
926 sdev->retry_hwerror = 1;
927
928 transport_configure_device(&sdev->sdev_gendev);
929
Christoph Hellwig93805092006-02-17 12:11:29 +0100930 if (sdev->host->hostt->slave_configure) {
James Bottomley6f4267e2008-08-22 16:53:31 -0500931 ret = sdev->host->hostt->slave_configure(sdev);
Christoph Hellwig93805092006-02-17 12:11:29 +0100932 if (ret) {
933 /*
934 * if LLDD reports slave not present, don't clutter
935 * console with alloc failure messages
936 */
937 if (ret != -ENXIO) {
938 sdev_printk(KERN_ERR, sdev,
939 "failed to configure device\n");
940 }
941 return SCSI_SCAN_NO_RESPONSE;
942 }
943 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944
Vasu Dev4a840672009-10-22 15:46:33 -0700945 sdev->max_queue_depth = sdev->queue_depth;
946
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 /*
948 * Ok, the device is now all set up, we can
949 * register it and tell the rest of the kernel
950 * about it.
951 */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600952 if (!async && scsi_sysfs_add_sdev(sdev) != 0)
Alan Sternb24b1032005-07-27 11:43:46 -0700953 return SCSI_SCAN_NO_RESPONSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954
955 return SCSI_SCAN_LUN_PRESENT;
956}
957
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700958#ifdef CONFIG_SCSI_LOGGING
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200959/**
Rob Landleyeb448202007-11-03 13:30:39 -0500960 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200961 * @buf: Output buffer with at least end-first+1 bytes of space
962 * @inq: Inquiry buffer (input)
963 * @first: Offset of string into inq
964 * @end: Index after last character in inq
965 */
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700966static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200967 unsigned first, unsigned end)
968{
969 unsigned term = 0, idx;
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700970
971 for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
972 if (inq[idx+first] > ' ') {
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200973 buf[idx] = inq[idx+first];
974 term = idx+1;
975 } else {
976 buf[idx] = ' ';
977 }
978 }
979 buf[term] = 0;
980 return buf;
981}
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700982#endif
James Bottomley6f3a2022005-09-22 20:33:28 -0500983
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984/**
985 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
986 * @starget: pointer to target device structure
987 * @lun: LUN of target device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 * @bflagsp: store bflags here if not NULL
Rob Landleyeb448202007-11-03 13:30:39 -0500989 * @sdevp: probe the LUN corresponding to this scsi_device
990 * @rescan: if nonzero skip some code only needed on first scan
991 * @hostdata: passed to scsi_alloc_sdev()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 *
993 * Description:
994 * Call scsi_probe_lun, if a LUN with an attached device is found,
995 * allocate and set it up by calling scsi_add_lun.
996 *
997 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100998 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
1000 * attached at the LUN
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001001 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 **/
1003static int scsi_probe_and_add_lun(struct scsi_target *starget,
1004 uint lun, int *bflagsp,
1005 struct scsi_device **sdevp, int rescan,
1006 void *hostdata)
1007{
1008 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 unsigned char *result;
James Bottomley39216032005-06-15 18:48:29 -05001010 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1012
1013 /*
1014 * The rescan flag is used as an optimization, the first scan of a
1015 * host adapter calls into here with rescan == 0.
1016 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001017 sdev = scsi_device_lookup_by_target(starget, lun);
1018 if (sdev) {
James Bottomley0f1d87a2008-08-22 16:43:59 -05001019 if (rescan || !scsi_device_created(sdev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1021 "scsi scan: device exists on %s\n",
Kay Sievers71610f52008-12-03 22:41:36 +01001022 dev_name(&sdev->sdev_gendev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 if (sdevp)
1024 *sdevp = sdev;
1025 else
1026 scsi_device_put(sdev);
1027
1028 if (bflagsp)
1029 *bflagsp = scsi_get_device_flags(sdev,
1030 sdev->vendor,
1031 sdev->model);
1032 return SCSI_SCAN_LUN_PRESENT;
1033 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001034 scsi_device_put(sdev);
1035 } else
1036 sdev = scsi_alloc_sdev(starget, lun, hostdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 if (!sdev)
1038 goto out;
James Bottomley39216032005-06-15 18:48:29 -05001039
1040 result = kmalloc(result_len, GFP_ATOMIC |
Al Virobc861202005-04-24 12:28:34 -07001041 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 if (!result)
James Bottomley39216032005-06-15 18:48:29 -05001043 goto out_free_sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044
James Bottomley39216032005-06-15 18:48:29 -05001045 if (scsi_probe_lun(sdev, result, result_len, &bflags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 goto out_free_result;
1047
Kurt Garloff4186ab12006-04-03 15:16:48 +02001048 if (bflagsp)
1049 *bflagsp = bflags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 /*
1051 * result contains valid SCSI INQUIRY data.
1052 */
Kurt Garloff13f7e5a2006-04-03 15:20:08 +02001053 if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 /*
1055 * For a Peripheral qualifier 3 (011b), the SCSI
1056 * spec says: The device server is not capable of
1057 * supporting a physical device on this logical
1058 * unit.
1059 *
1060 * For disks, this implies that there is no
1061 * logical disk configured at sdev->lun, but there
1062 * is a target id responding.
1063 */
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001064 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
1065 " peripheral qualifier of 3, device not"
1066 " added\n"))
1067 if (lun == 0) {
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001068 SCSI_LOG_SCAN_BUS(1, {
1069 unsigned char vend[9];
1070 unsigned char mod[17];
1071
1072 sdev_printk(KERN_INFO, sdev,
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001073 "scsi scan: consider passing scsi_mod."
Kurt Garloff3424a652007-01-09 02:28:54 +01001074 "dev_flags=%s:%s:0x240 or 0x1000240\n",
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001075 scsi_inq_str(vend, result, 8, 16),
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001076 scsi_inq_str(mod, result, 16, 32));
1077 });
James Bottomley643eb2d2008-03-22 22:42:27 -05001078
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001079 }
James Bottomley643eb2d2008-03-22 22:42:27 -05001080
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 res = SCSI_SCAN_TARGET_PRESENT;
1082 goto out_free_result;
1083 }
1084
Alan Stern1bfc5d92006-02-09 15:26:18 -05001085 /*
dave wysochanski84961f22006-08-09 14:56:32 -04001086 * Some targets may set slight variations of PQ and PDT to signal
1087 * that no LUN is present, so don't add sdev in these cases.
1088 * Two specific examples are:
1089 * 1) NetApp targets: return PQ=1, PDT=0x1f
1090 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1091 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1092 *
1093 * References:
1094 * 1) SCSI SPC-3, pp. 145-146
1095 * PQ=1: "A peripheral device having the specified peripheral
1096 * device type is not connected to this logical unit. However, the
1097 * device server is capable of supporting the specified peripheral
1098 * device type on this logical unit."
1099 * PDT=0x1f: "Unknown or no device type"
1100 * 2) USB UFI 1.0, p. 20
1101 * PDT=00h Direct-access device (floppy)
1102 * PDT=1Fh none (no FDD connected to the requested logical unit)
Alan Stern1bfc5d92006-02-09 15:26:18 -05001103 */
dave wysochanski84961f22006-08-09 14:56:32 -04001104 if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) &&
James Bottomley01b291b2008-08-21 15:14:14 -05001105 (result[0] & 0x1f) == 0x1f &&
1106 !scsi_is_wlun(lun)) {
Alan Stern1bfc5d92006-02-09 15:26:18 -05001107 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1108 "scsi scan: peripheral device type"
1109 " of 31, no device added\n"));
1110 res = SCSI_SCAN_TARGET_PRESENT;
1111 goto out_free_result;
1112 }
1113
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001114 res = scsi_add_lun(sdev, result, &bflags, shost->async_scan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 if (res == SCSI_SCAN_LUN_PRESENT) {
1116 if (bflags & BLIST_KEY) {
1117 sdev->lockable = 0;
James Bottomley39216032005-06-15 18:48:29 -05001118 scsi_unlock_floptical(sdev, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 }
1121
1122 out_free_result:
1123 kfree(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 out_free_sdev:
1125 if (res == SCSI_SCAN_LUN_PRESENT) {
1126 if (sdevp) {
Alan Sternb70d37b2005-07-26 10:30:40 -04001127 if (scsi_device_get(sdev) == 0) {
1128 *sdevp = sdev;
1129 } else {
1130 __scsi_remove_device(sdev);
1131 res = SCSI_SCAN_NO_RESPONSE;
1132 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001134 } else
James Bottomley860dc732009-11-19 17:48:29 -05001135 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 out:
1137 return res;
1138}
1139
1140/**
1141 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1142 * @starget: pointer to target structure to scan
1143 * @bflags: black/white list flag for LUN 0
Rob Landleyeb448202007-11-03 13:30:39 -05001144 * @scsi_level: Which version of the standard does this device adhere to
1145 * @rescan: passed to scsi_probe_add_lun()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 *
1147 * Description:
1148 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1149 * scanned) to some maximum lun until a LUN is found with no device
1150 * attached. Use the bflags to figure out any oddities.
1151 *
1152 * Modifies sdevscan->lun.
1153 **/
1154static void scsi_sequential_lun_scan(struct scsi_target *starget,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001155 int bflags, int scsi_level, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156{
1157 unsigned int sparse_lun, lun, max_dev_lun;
1158 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1159
1160 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of"
Kay Sievers71610f52008-12-03 22:41:36 +01001161 "%s\n", dev_name(&starget->dev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162
1163 max_dev_lun = min(max_scsi_luns, shost->max_lun);
1164 /*
1165 * If this device is known to support sparse multiple units,
1166 * override the other settings, and scan all of them. Normally,
1167 * SCSI-3 devices should be scanned via the REPORT LUNS.
1168 */
1169 if (bflags & BLIST_SPARSELUN) {
1170 max_dev_lun = shost->max_lun;
1171 sparse_lun = 1;
1172 } else
1173 sparse_lun = 0;
1174
1175 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 * If less than SCSI_1_CSS, and no special lun scaning, stop
1177 * scanning; this matches 2.4 behaviour, but could just be a bug
1178 * (to continue scanning a SCSI_1_CSS device).
1179 *
1180 * This test is broken. We might not have any device on lun0 for
1181 * a sparselun device, and if that's the case then how would we
1182 * know the real scsi_level, eh? It might make sense to just not
1183 * scan any SCSI_1 device for non-0 luns, but that check would best
1184 * go into scsi_alloc_sdev() and just have it return null when asked
1185 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1186 *
1187 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1188 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1189 == 0))
1190 return;
1191 */
1192 /*
1193 * If this device is known to support multiple units, override
1194 * the other settings, and scan all of them.
1195 */
1196 if (bflags & BLIST_FORCELUN)
1197 max_dev_lun = shost->max_lun;
1198 /*
1199 * REGAL CDC-4X: avoid hang after LUN 4
1200 */
1201 if (bflags & BLIST_MAX5LUN)
1202 max_dev_lun = min(5U, max_dev_lun);
1203 /*
1204 * Do not scan SCSI-2 or lower device past LUN 7, unless
1205 * BLIST_LARGELUN.
1206 */
1207 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
1208 max_dev_lun = min(8U, max_dev_lun);
1209
1210 /*
1211 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1212 * until we reach the max, or no LUN is found and we are not
1213 * sparse_lun.
1214 */
1215 for (lun = 1; lun < max_dev_lun; ++lun)
1216 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
1217 NULL) != SCSI_SCAN_LUN_PRESENT) &&
1218 !sparse_lun)
1219 return;
1220}
1221
1222/**
1223 * scsilun_to_int: convert a scsi_lun to an int
1224 * @scsilun: struct scsi_lun to be converted.
1225 *
1226 * Description:
1227 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1228 * integer, and return the result. The caller must check for
1229 * truncation before using this function.
1230 *
1231 * Notes:
1232 * The struct scsi_lun is assumed to be four levels, with each level
1233 * effectively containing a SCSI byte-ordered (big endian) short; the
1234 * addressing bits of each level are ignored (the highest two bits).
1235 * For a description of the LUN format, post SCSI-3 see the SCSI
1236 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1237 *
1238 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1239 * the integer: 0x0b030a04
1240 **/
Christof Schmitt462b7852007-06-19 10:25:30 +02001241int scsilun_to_int(struct scsi_lun *scsilun)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242{
1243 int i;
1244 unsigned int lun;
1245
1246 lun = 0;
1247 for (i = 0; i < sizeof(lun); i += 2)
1248 lun = lun | (((scsilun->scsi_lun[i] << 8) |
1249 scsilun->scsi_lun[i + 1]) << (i * 8));
1250 return lun;
1251}
Christof Schmitt462b7852007-06-19 10:25:30 +02001252EXPORT_SYMBOL(scsilun_to_int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253
1254/**
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001255 * int_to_scsilun: reverts an int into a scsi_lun
Rob Landleyeb448202007-11-03 13:30:39 -05001256 * @lun: integer to be reverted
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001257 * @scsilun: struct scsi_lun to be set.
1258 *
1259 * Description:
1260 * Reverts the functionality of the scsilun_to_int, which packed
1261 * an 8-byte lun value into an int. This routine unpacks the int
1262 * back into the lun value.
1263 * Note: the scsilun_to_int() routine does not truly handle all
1264 * 8bytes of the lun value. This functions restores only as much
1265 * as was set by the routine.
1266 *
1267 * Notes:
1268 * Given an integer : 0x0b030a04, this function returns a
1269 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1270 *
1271 **/
1272void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun)
1273{
1274 int i;
1275
1276 memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
1277
1278 for (i = 0; i < sizeof(lun); i += 2) {
1279 scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
1280 scsilun->scsi_lun[i+1] = lun & 0xFF;
1281 lun = lun >> 16;
1282 }
1283}
1284EXPORT_SYMBOL(int_to_scsilun);
1285
1286/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
Rob Landleyeb448202007-11-03 13:30:39 -05001288 * @starget: which target
1289 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1290 * @rescan: nonzero if we can skip code only needed on first scan
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291 *
1292 * Description:
Rob Landleyeb448202007-11-03 13:30:39 -05001293 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1294 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 *
Rob Landleyeb448202007-11-03 13:30:39 -05001296 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1297 * LUNs even if it's older than SCSI-3.
1298 * If BLIST_NOREPORTLUN is set, return 1 always.
1299 * If BLIST_NOLUN is set, return 0 always.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300 *
1301 * Return:
1302 * 0: scan completed (or no memory, so further scanning is futile)
Rob Landleyeb448202007-11-03 13:30:39 -05001303 * 1: could not scan with REPORT LUN
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304 **/
James Bottomley6f3a2022005-09-22 20:33:28 -05001305static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 int rescan)
1307{
1308 char devname[64];
1309 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1310 unsigned int length;
1311 unsigned int lun;
1312 unsigned int num_luns;
1313 unsigned int retries;
James Bottomley39216032005-06-15 18:48:29 -05001314 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 struct scsi_lun *lunp, *lun_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 u8 *data;
1317 struct scsi_sense_hdr sshdr;
James Bottomley6f3a2022005-09-22 20:33:28 -05001318 struct scsi_device *sdev;
1319 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
Alan Stern2ef89192005-11-08 15:51:55 -05001320 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321
1322 /*
1323 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1324 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1325 * support more than 8 LUNs.
1326 */
James Bottomley4d7db042006-03-31 20:07:45 -06001327 if (bflags & BLIST_NOREPORTLUN)
1328 return 1;
1329 if (starget->scsi_level < SCSI_2 &&
1330 starget->scsi_level != SCSI_UNKNOWN)
1331 return 1;
1332 if (starget->scsi_level < SCSI_3 &&
1333 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 return 1;
1335 if (bflags & BLIST_NOLUN)
1336 return 0;
1337
James Bottomley6f3a2022005-09-22 20:33:28 -05001338 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1339 sdev = scsi_alloc_sdev(starget, 0, NULL);
1340 if (!sdev)
1341 return 0;
Alan Stern75f8ee82010-02-12 12:13:31 -05001342 if (scsi_device_get(sdev)) {
1343 __scsi_remove_device(sdev);
James Bottomley6f3a2022005-09-22 20:33:28 -05001344 return 0;
Alan Stern75f8ee82010-02-12 12:13:31 -05001345 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001346 }
1347
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 sprintf(devname, "host %d channel %d id %d",
James Bottomley6f3a2022005-09-22 20:33:28 -05001349 shost->host_no, sdev->channel, sdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350
1351 /*
1352 * Allocate enough to hold the header (the same size as one scsi_lun)
1353 * plus the max number of luns we are requesting.
1354 *
1355 * Reallocating and trying again (with the exact amount we need)
1356 * would be nice, but then we need to somehow limit the size
1357 * allocated based on the available memory and the limits of
1358 * kmalloc - we don't want a kmalloc() failure of a huge value to
1359 * prevent us from finding any LUNs on this target.
1360 */
1361 length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun);
1362 lun_data = kmalloc(length, GFP_ATOMIC |
1363 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
James Bottomley6f3a2022005-09-22 20:33:28 -05001364 if (!lun_data) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001365 printk(ALLOC_FAILURE_MSG, __func__);
James Bottomley39216032005-06-15 18:48:29 -05001366 goto out;
James Bottomley6f3a2022005-09-22 20:33:28 -05001367 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368
1369 scsi_cmd[0] = REPORT_LUNS;
1370
1371 /*
1372 * bytes 1 - 5: reserved, set to zero.
1373 */
1374 memset(&scsi_cmd[1], 0, 5);
1375
1376 /*
1377 * bytes 6 - 9: length of the command.
1378 */
1379 scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff;
1380 scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff;
1381 scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff;
1382 scsi_cmd[9] = (unsigned char) length & 0xff;
1383
1384 scsi_cmd[10] = 0; /* reserved */
1385 scsi_cmd[11] = 0; /* control */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386
1387 /*
1388 * We can get a UNIT ATTENTION, for example a power on/reset, so
1389 * retry a few times (like sd.c does for TEST UNIT READY).
1390 * Experience shows some combinations of adapter/devices get at
1391 * least two power on/resets.
1392 *
1393 * Illegal requests (for devices that do not support REPORT LUNS)
1394 * should come through as a check condition, and will not generate
1395 * a retry.
1396 */
1397 for (retries = 0; retries < 3; retries++) {
1398 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending"
1399 " REPORT LUNS to %s (try %d)\n", devname,
1400 retries));
James Bottomley39216032005-06-15 18:48:29 -05001401
James Bottomley39216032005-06-15 18:48:29 -05001402 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001403 lun_data, length, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09001404 SCSI_TIMEOUT + 4 * HZ, 3, NULL);
James Bottomley39216032005-06-15 18:48:29 -05001405
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS"
James Bottomley39216032005-06-15 18:48:29 -05001407 " %s (try %d) result 0x%x\n", result
1408 ? "failed" : "successful", retries, result));
1409 if (result == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 break;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001411 else if (scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412 if (sshdr.sense_key != UNIT_ATTENTION)
1413 break;
1414 }
1415 }
1416
James Bottomley39216032005-06-15 18:48:29 -05001417 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418 /*
1419 * The device probably does not support a REPORT LUN command
1420 */
Alan Stern2ef89192005-11-08 15:51:55 -05001421 ret = 1;
1422 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424
1425 /*
1426 * Get the length from the first four bytes of lun_data.
1427 */
1428 data = (u8 *) lun_data->scsi_lun;
1429 length = ((data[0] << 24) | (data[1] << 16) |
1430 (data[2] << 8) | (data[3] << 0));
1431
1432 num_luns = (length / sizeof(struct scsi_lun));
1433 if (num_luns > max_scsi_report_luns) {
1434 printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)"
1435 " of %d luns reported, try increasing"
1436 " max_scsi_report_luns.\n", devname,
1437 max_scsi_report_luns, num_luns);
1438 num_luns = max_scsi_report_luns;
1439 }
1440
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001441 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1442 "scsi scan: REPORT LUN scan\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443
1444 /*
1445 * Scan the luns in lun_data. The entry at offset 0 is really
1446 * the header, so start at 1 and go up to and including num_luns.
1447 */
1448 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1449 lun = scsilun_to_int(lunp);
1450
1451 /*
1452 * Check if the unused part of lunp is non-zero, and so
1453 * does not fit in lun.
1454 */
1455 if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) {
1456 int i;
1457
1458 /*
1459 * Output an error displaying the LUN in byte order,
1460 * this differs from what linux would print for the
1461 * integer LUN value.
1462 */
1463 printk(KERN_WARNING "scsi: %s lun 0x", devname);
1464 data = (char *)lunp->scsi_lun;
1465 for (i = 0; i < sizeof(struct scsi_lun); i++)
1466 printk("%02x", data[i]);
1467 printk(" has a LUN larger than currently supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 } else if (lun > sdev->host->max_lun) {
1469 printk(KERN_WARNING "scsi: %s lun%d has a LUN larger"
1470 " than allowed by the host adapter\n",
1471 devname, lun);
1472 } else {
1473 int res;
1474
1475 res = scsi_probe_and_add_lun(starget,
1476 lun, NULL, NULL, rescan, NULL);
1477 if (res == SCSI_SCAN_NO_RESPONSE) {
1478 /*
1479 * Got some results, but now none, abort.
1480 */
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001481 sdev_printk(KERN_ERR, sdev,
1482 "Unexpected response"
1483 " from lun %d while scanning, scan"
1484 " aborted\n", lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485 break;
1486 }
1487 }
1488 }
1489
Alan Stern2ef89192005-11-08 15:51:55 -05001490 out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491 kfree(lun_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 out:
James Bottomley6f3a2022005-09-22 20:33:28 -05001493 scsi_device_put(sdev);
James Bottomley0f1d87a2008-08-22 16:43:59 -05001494 if (scsi_device_created(sdev))
James Bottomley6f3a2022005-09-22 20:33:28 -05001495 /*
1496 * the sdev we used didn't appear in the report luns scan
1497 */
James Bottomley860dc732009-11-19 17:48:29 -05001498 __scsi_remove_device(sdev);
Alan Stern2ef89192005-11-08 15:51:55 -05001499 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500}
1501
1502struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
1503 uint id, uint lun, void *hostdata)
1504{
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001505 struct scsi_device *sdev = ERR_PTR(-ENODEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506 struct device *parent = &shost->shost_gendev;
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001507 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508
Matthew Wilcox938e2ac2007-01-15 18:07:09 -07001509 if (strncmp(scsi_scan_type, "none", 4) == 0)
1510 return ERR_PTR(-ENODEV);
1511
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001512 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513 if (!starget)
1514 return ERR_PTR(-ENOMEM);
1515
Arjan van de Ven0b950672006-01-11 13:16:10 +01001516 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001517 if (!shost->async_scan)
1518 scsi_complete_async_scans();
1519
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001520 if (scsi_host_scan_allowed(shost))
1521 scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001522 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523 scsi_target_reap(starget);
1524 put_device(&starget->dev);
1525
1526 return sdev;
1527}
1528EXPORT_SYMBOL(__scsi_add_device);
1529
James Bottomley146f7262005-09-10 12:44:09 -05001530int scsi_add_device(struct Scsi_Host *host, uint channel,
1531 uint target, uint lun)
1532{
1533 struct scsi_device *sdev =
1534 __scsi_add_device(host, channel, target, lun, NULL);
1535 if (IS_ERR(sdev))
1536 return PTR_ERR(sdev);
1537
1538 scsi_device_put(sdev);
1539 return 0;
1540}
1541EXPORT_SYMBOL(scsi_add_device);
1542
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543void scsi_rescan_device(struct device *dev)
1544{
1545 struct scsi_driver *drv;
1546
1547 if (!dev->driver)
1548 return;
1549
1550 drv = to_scsi_driver(dev->driver);
1551 if (try_module_get(drv->owner)) {
1552 if (drv->rescan)
1553 drv->rescan(dev);
1554 module_put(drv->owner);
1555 }
1556}
1557EXPORT_SYMBOL(scsi_rescan_device);
1558
Alan Sterne517d312005-07-26 10:18:45 -04001559static void __scsi_scan_target(struct device *parent, unsigned int channel,
1560 unsigned int id, unsigned int lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561{
1562 struct Scsi_Host *shost = dev_to_shost(parent);
1563 int bflags = 0;
1564 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565 struct scsi_target *starget;
1566
1567 if (shost->this_id == id)
1568 /*
1569 * Don't scan the host adapter
1570 */
1571 return;
1572
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001574 if (!starget)
1575 return;
1576
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 if (lun != SCAN_WILD_CARD) {
1578 /*
1579 * Scan for a specific host/chan/id/lun.
1580 */
1581 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1582 goto out_reap;
1583 }
1584
1585 /*
1586 * Scan LUN 0, if there is some response, scan further. Ideally, we
1587 * would not configure LUN 0 until all LUNs are scanned.
1588 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001589 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1590 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1591 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592 /*
1593 * The REPORT LUN did not scan the target,
1594 * do a sequential scan.
1595 */
1596 scsi_sequential_lun_scan(starget, bflags,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001597 starget->scsi_level, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599
1600 out_reap:
1601 /* now determine if the target has any children at all
1602 * and if not, nuke it */
1603 scsi_target_reap(starget);
1604
1605 put_device(&starget->dev);
1606}
Alan Sterne517d312005-07-26 10:18:45 -04001607
1608/**
Randy Dunlape59e4a02008-02-29 22:02:50 -08001609 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
Alan Sterne517d312005-07-26 10:18:45 -04001610 * @parent: host to scan
1611 * @channel: channel to scan
1612 * @id: target id to scan
1613 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1614 * @rescan: passed to LUN scanning routines
1615 *
1616 * Description:
1617 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1618 * and possibly all LUNs on the target id.
1619 *
1620 * First try a REPORT LUN scan, if that does not scan the target, do a
1621 * sequential scan of LUNs on the target id.
1622 **/
1623void scsi_scan_target(struct device *parent, unsigned int channel,
1624 unsigned int id, unsigned int lun, int rescan)
1625{
1626 struct Scsi_Host *shost = dev_to_shost(parent);
1627
Matthew Wilcox93b45af2006-11-22 13:24:53 -07001628 if (strncmp(scsi_scan_type, "none", 4) == 0)
1629 return;
1630
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001631 mutex_lock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001632 if (!shost->async_scan)
1633 scsi_complete_async_scans();
1634
Alan Sterne517d312005-07-26 10:18:45 -04001635 if (scsi_host_scan_allowed(shost))
1636 __scsi_scan_target(parent, channel, id, lun, rescan);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001637 mutex_unlock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001638}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639EXPORT_SYMBOL(scsi_scan_target);
1640
1641static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1642 unsigned int id, unsigned int lun, int rescan)
1643{
1644 uint order_id;
1645
1646 if (id == SCAN_WILD_CARD)
1647 for (id = 0; id < shost->max_id; ++id) {
1648 /*
1649 * XXX adapter drivers when possible (FCP, iSCSI)
1650 * could modify max_id to match the current max,
1651 * not the absolute max.
1652 *
1653 * XXX add a shost id iterator, so for example,
1654 * the FC ID can be the same as a target id
1655 * without a huge overhead of sparse id's.
1656 */
1657 if (shost->reverse_ordering)
1658 /*
1659 * Scan from high to low id.
1660 */
1661 order_id = shost->max_id - id - 1;
1662 else
1663 order_id = id;
Alan Sterne517d312005-07-26 10:18:45 -04001664 __scsi_scan_target(&shost->shost_gendev, channel,
1665 order_id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666 }
1667 else
Alan Sterne517d312005-07-26 10:18:45 -04001668 __scsi_scan_target(&shost->shost_gendev, channel,
1669 id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670}
1671
1672int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1673 unsigned int id, unsigned int lun, int rescan)
1674{
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001675 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
1676 "%s: <%u:%u:%u>\n",
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001677 __func__, channel, id, lun));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001678
1679 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
Amit Arora091686d2006-05-19 16:14:50 -07001680 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1682 return -EINVAL;
1683
Arjan van de Ven0b950672006-01-11 13:16:10 +01001684 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001685 if (!shost->async_scan)
1686 scsi_complete_async_scans();
1687
Mike Anderson82f29462005-06-16 11:14:33 -07001688 if (scsi_host_scan_allowed(shost)) {
1689 if (channel == SCAN_WILD_CARD)
1690 for (channel = 0; channel <= shost->max_channel;
1691 channel++)
1692 scsi_scan_channel(shost, channel, id, lun,
1693 rescan);
1694 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001695 scsi_scan_channel(shost, channel, id, lun, rescan);
Mike Anderson82f29462005-06-16 11:14:33 -07001696 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001697 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698
1699 return 0;
1700}
1701
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001702static void scsi_sysfs_add_devices(struct Scsi_Host *shost)
1703{
1704 struct scsi_device *sdev;
1705 shost_for_each_device(sdev, shost) {
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001706 if (!scsi_host_scan_allowed(shost) ||
1707 scsi_sysfs_add_sdev(sdev) != 0)
James Bottomley860dc732009-11-19 17:48:29 -05001708 __scsi_remove_device(sdev);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001709 }
1710}
1711
1712/**
1713 * scsi_prep_async_scan - prepare for an async scan
1714 * @shost: the host which will be scanned
1715 * Returns: a cookie to be passed to scsi_finish_async_scan()
1716 *
1717 * Tells the midlayer this host is going to do an asynchronous scan.
1718 * It reserves the host's position in the scanning list and ensures
1719 * that other asynchronous scans started after this one won't affect the
1720 * ordering of the discovered devices.
1721 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001722static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001723{
1724 struct async_scan_data *data;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001725 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001726
1727 if (strncmp(scsi_scan_type, "sync", 4) == 0)
1728 return NULL;
1729
1730 if (shost->async_scan) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001731 printk("%s called twice for host %d", __func__,
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001732 shost->host_no);
1733 dump_stack();
1734 return NULL;
1735 }
1736
1737 data = kmalloc(sizeof(*data), GFP_KERNEL);
1738 if (!data)
1739 goto err;
1740 data->shost = scsi_host_get(shost);
1741 if (!data->shost)
1742 goto err;
1743 init_completion(&data->prev_finished);
1744
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001745 mutex_lock(&shost->scan_mutex);
1746 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001747 shost->async_scan = 1;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001748 spin_unlock_irqrestore(shost->host_lock, flags);
1749 mutex_unlock(&shost->scan_mutex);
1750
1751 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001752 if (list_empty(&scanning_hosts))
1753 complete(&data->prev_finished);
1754 list_add_tail(&data->list, &scanning_hosts);
1755 spin_unlock(&async_scan_lock);
1756
1757 return data;
1758
1759 err:
1760 kfree(data);
1761 return NULL;
1762}
1763
1764/**
1765 * scsi_finish_async_scan - asynchronous scan has finished
1766 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1767 *
1768 * All the devices currently attached to this host have been found.
1769 * This function announces all the devices it has found to the rest
1770 * of the system.
1771 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001772static void scsi_finish_async_scan(struct async_scan_data *data)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001773{
1774 struct Scsi_Host *shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001775 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001776
1777 if (!data)
1778 return;
1779
1780 shost = data->shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001781
1782 mutex_lock(&shost->scan_mutex);
1783
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001784 if (!shost->async_scan) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001785 printk("%s called twice for host %d", __func__,
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001786 shost->host_no);
1787 dump_stack();
Julia Lawall773e82f2008-07-21 09:58:30 +02001788 mutex_unlock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001789 return;
1790 }
1791
1792 wait_for_completion(&data->prev_finished);
1793
1794 scsi_sysfs_add_devices(shost);
1795
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001796 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001797 shost->async_scan = 0;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001798 spin_unlock_irqrestore(shost->host_lock, flags);
1799
1800 mutex_unlock(&shost->scan_mutex);
1801
1802 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001803 list_del(&data->list);
1804 if (!list_empty(&scanning_hosts)) {
1805 struct async_scan_data *next = list_entry(scanning_hosts.next,
1806 struct async_scan_data, list);
1807 complete(&next->prev_finished);
1808 }
1809 spin_unlock(&async_scan_lock);
1810
1811 scsi_host_put(shost);
1812 kfree(data);
1813}
1814
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001815static void do_scsi_scan_host(struct Scsi_Host *shost)
1816{
1817 if (shost->hostt->scan_finished) {
1818 unsigned long start = jiffies;
1819 if (shost->hostt->scan_start)
1820 shost->hostt->scan_start(shost);
1821
1822 while (!shost->hostt->scan_finished(shost, jiffies - start))
1823 msleep(10);
1824 } else {
1825 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1826 SCAN_WILD_CARD, 0);
1827 }
1828}
1829
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001830static int do_scan_async(void *_data)
1831{
1832 struct async_scan_data *data = _data;
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001833 do_scsi_scan_host(data->shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001834 scsi_finish_async_scan(data);
1835 return 0;
1836}
1837
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838/**
1839 * scsi_scan_host - scan the given adapter
1840 * @shost: adapter to scan
1841 **/
1842void scsi_scan_host(struct Scsi_Host *shost)
1843{
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001844 struct task_struct *p;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001845 struct async_scan_data *data;
1846
1847 if (strncmp(scsi_scan_type, "none", 4) == 0)
1848 return;
1849
1850 data = scsi_prep_async_scan(shost);
1851 if (!data) {
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001852 do_scsi_scan_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001853 return;
1854 }
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001855
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001856 p = kthread_run(do_scan_async, data, "scsi_scan_%d", shost->host_no);
Hirofumi Nakagawa801678c2008-04-29 01:03:09 -07001857 if (IS_ERR(p))
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001858 do_scan_async(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859}
1860EXPORT_SYMBOL(scsi_scan_host);
1861
Linus Torvalds1da177e2005-04-16 15:20:36 -07001862void scsi_forget_host(struct Scsi_Host *shost)
1863{
Alan Sterna64358d2005-07-26 10:27:10 -04001864 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001865 unsigned long flags;
1866
Alan Sterna64358d2005-07-26 10:27:10 -04001867 restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001868 spin_lock_irqsave(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001869 list_for_each_entry(sdev, &shost->__devices, siblings) {
1870 if (sdev->sdev_state == SDEV_DEL)
1871 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872 spin_unlock_irqrestore(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001873 __scsi_remove_device(sdev);
1874 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875 }
1876 spin_unlock_irqrestore(shost->host_lock, flags);
1877}
1878
1879/*
1880 * Function: scsi_get_host_dev()
1881 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001882 * Purpose: Create a scsi_device that points to the host adapter itself.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001883 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001884 * Arguments: SHpnt - Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885 *
1886 * Lock status: None assumed.
1887 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001888 * Returns: The scsi_device or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001889 *
1890 * Notes:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001891 * Attach a single scsi_device to the Scsi_Host - this should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892 * be made to look like a "pseudo-device" that points to the
1893 * HA itself.
1894 *
1895 * Note - this device is not accessible from any high-level
1896 * drivers (including generics), which is probably not
1897 * optimal. We can add hooks later to attach
1898 */
1899struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1900{
Alan Sterne517d312005-07-26 10:18:45 -04001901 struct scsi_device *sdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902 struct scsi_target *starget;
1903
Arjan van de Ven0b950672006-01-11 13:16:10 +01001904 mutex_lock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001905 if (!scsi_host_scan_allowed(shost))
1906 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001907 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1908 if (!starget)
Alan Sterne517d312005-07-26 10:18:45 -04001909 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001910
1911 sdev = scsi_alloc_sdev(starget, 0, NULL);
Alan Sternd5469112010-02-12 12:13:39 -05001912 if (sdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913 sdev->borken = 0;
Alan Sternd5469112010-02-12 12:13:39 -05001914 else
James Bottomley884d25c2006-09-05 16:26:41 -05001915 scsi_target_reap(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916 put_device(&starget->dev);
Alan Sterne517d312005-07-26 10:18:45 -04001917 out:
Arjan van de Ven0b950672006-01-11 13:16:10 +01001918 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919 return sdev;
1920}
1921EXPORT_SYMBOL(scsi_get_host_dev);
1922
1923/*
1924 * Function: scsi_free_host_dev()
1925 *
1926 * Purpose: Free a scsi_device that points to the host adapter itself.
1927 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001928 * Arguments: SHpnt - Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001929 *
1930 * Lock status: None assumed.
1931 *
1932 * Returns: Nothing
1933 *
1934 * Notes:
1935 */
1936void scsi_free_host_dev(struct scsi_device *sdev)
1937{
1938 BUG_ON(sdev->id != sdev->host->this_id);
1939
James Bottomley860dc732009-11-19 17:48:29 -05001940 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001941}
1942EXPORT_SYMBOL(scsi_free_host_dev);
1943