blob: 6a820668d442f2e1b1d111ee652717e9ae0e896a [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>
Rob Evers2a904e52014-12-16 11:01:19 -050037#include <asm/unaligned.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#include <scsi/scsi.h>
Christoph Hellwigbeb40482006-06-10 18:01:03 +020040#include <scsi/scsi_cmnd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <scsi/scsi_device.h>
42#include <scsi/scsi_driver.h>
43#include <scsi/scsi_devinfo.h>
44#include <scsi/scsi_host.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <scsi/scsi_transport.h>
46#include <scsi/scsi_eh.h>
47
48#include "scsi_priv.h"
49#include "scsi_logging.h"
50
51#define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
52 " SCSI scanning, some SCSI devices might not be configured\n"
53
54/*
55 * Default timeout
56 */
57#define SCSI_TIMEOUT (2*HZ)
Brian Kingb39c9a662015-09-04 14:47:06 -050058#define SCSI_REPORT_LUNS_TIMEOUT (30*HZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
60/*
Robert P. J. Day405ae7d2007-02-17 19:13:42 +010061 * Prefix values for the SCSI id's (stored in sysfs name field)
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 */
63#define SCSI_UID_SER_NUM 'S'
64#define SCSI_UID_UNKNOWN 'Z'
65
66/*
67 * Return values of some of the scanning functions.
68 *
69 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
70 * includes allocation or general failures preventing IO from being sent.
71 *
72 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
73 * on the given LUN.
74 *
75 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
76 * given LUN.
77 */
78#define SCSI_SCAN_NO_RESPONSE 0
79#define SCSI_SCAN_TARGET_PRESENT 1
80#define SCSI_SCAN_LUN_PRESENT 2
81
Arjan van de Ven0ad78202005-11-28 16:22:25 +010082static const char *scsi_null_device_strs = "nullnullnullnull";
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
84#define MAX_SCSI_LUNS 512
85
Hannes Reinecke1abf6352014-06-25 15:27:38 +020086static u64 max_scsi_luns = MAX_SCSI_LUNS;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
Hannes Reinecke1abf6352014-06-25 15:27:38 +020088module_param_named(max_luns, max_scsi_luns, ullong, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089MODULE_PARM_DESC(max_luns,
Hannes Reinecke1abf6352014-06-25 15:27:38 +020090 "last scsi LUN (should be between 1 and 2^64-1)");
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
Matthew Wilcox21db1882006-11-22 13:24:52 -070092#ifdef CONFIG_SCSI_SCAN_ASYNC
93#define SCSI_SCAN_TYPE_DEFAULT "async"
94#else
95#define SCSI_SCAN_TYPE_DEFAULT "sync"
96#endif
97
Dan Williams3c31b522014-04-10 15:30:35 -070098char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT;
Matthew Wilcox3e082a92006-09-28 15:19:20 -060099
100module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO);
101MODULE_PARM_DESC(scan, "sync, async or none");
102
Alan Stern14faf122009-03-12 11:08:51 -0400103static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ + 18;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
Masatake YAMATO10f4b892007-09-19 22:59:16 +0900105module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106MODULE_PARM_DESC(inq_timeout,
107 "Timeout (in seconds) waiting for devices to answer INQUIRY."
Alan Stern14faf122009-03-12 11:08:51 -0400108 " Default is 20. Some devices may need more; most need less.");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
Matthew Wilcox6b7f1232007-06-26 15:18:51 -0600110/* This lock protects only this list */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600111static DEFINE_SPINLOCK(async_scan_lock);
112static LIST_HEAD(scanning_hosts);
113
114struct async_scan_data {
115 struct list_head list;
116 struct Scsi_Host *shost;
117 struct completion prev_finished;
118};
119
120/**
121 * scsi_complete_async_scans - Wait for asynchronous scans to complete
122 *
Matthew Wilcox8bcc2412006-12-07 19:29:27 -0700123 * When this function returns, any host which started scanning before
124 * this function was called will have finished its scan. Hosts which
125 * started scanning after this function was called may or may not have
126 * finished.
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600127 */
128int scsi_complete_async_scans(void)
129{
130 struct async_scan_data *data;
131
132 do {
133 if (list_empty(&scanning_hosts))
Dan Williamse96eb232012-07-09 19:33:45 -0700134 return 0;
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600135 /* If we can't get memory immediately, that's OK. Just
136 * sleep a little. Even if we never get memory, the async
137 * scans will finish eventually.
138 */
139 data = kmalloc(sizeof(*data), GFP_KERNEL);
140 if (!data)
141 msleep(1);
142 } while (!data);
143
144 data->shost = NULL;
145 init_completion(&data->prev_finished);
146
147 spin_lock(&async_scan_lock);
148 /* Check that there's still somebody else on the list */
149 if (list_empty(&scanning_hosts))
150 goto done;
151 list_add_tail(&data->list, &scanning_hosts);
152 spin_unlock(&async_scan_lock);
153
154 printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n");
155 wait_for_completion(&data->prev_finished);
156
157 spin_lock(&async_scan_lock);
158 list_del(&data->list);
Matthew Wilcox8bcc2412006-12-07 19:29:27 -0700159 if (!list_empty(&scanning_hosts)) {
160 struct async_scan_data *next = list_entry(scanning_hosts.next,
161 struct async_scan_data, list);
162 complete(&next->prev_finished);
163 }
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600164 done:
165 spin_unlock(&async_scan_lock);
Dan Williamse96eb232012-07-09 19:33:45 -0700166
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600167 kfree(data);
168 return 0;
169}
170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171/**
172 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
James Bottomley39216032005-06-15 18:48:29 -0500173 * @sdev: scsi device to send command to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 * @result: area to store the result of the MODE SENSE
175 *
176 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500177 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 * Called for BLIST_KEY devices.
179 **/
James Bottomley39216032005-06-15 18:48:29 -0500180static void scsi_unlock_floptical(struct scsi_device *sdev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 unsigned char *result)
182{
183 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
184
Hannes Reinecke91921e02014-06-25 16:39:59 +0200185 sdev_printk(KERN_NOTICE, sdev, "unlocking floptical drive\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 scsi_cmd[0] = MODE_SENSE;
187 scsi_cmd[1] = 0;
188 scsi_cmd[2] = 0x2e;
189 scsi_cmd[3] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500190 scsi_cmd[4] = 0x2a; /* size */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 scsi_cmd[5] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500192 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900193 SCSI_TIMEOUT, 3, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194}
195
196/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 * scsi_alloc_sdev - allocate and setup a scsi_Device
Rob Landleyeb448202007-11-03 13:30:39 -0500198 * @starget: which target to allocate a &scsi_device for
199 * @lun: which lun
200 * @hostdata: usually NULL and set by ->slave_alloc instead
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 *
202 * Description:
203 * Allocate, initialize for io, and return a pointer to a scsi_Device.
204 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
205 * adds scsi_Device to the appropriate list.
206 *
207 * Return value:
208 * scsi_Device pointer, or NULL on failure.
209 **/
210static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +0200211 u64 lun, void *hostdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212{
213 struct scsi_device *sdev;
214 int display_failure_msg = 1, ret;
215 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
Jeff Garzika341cd02007-10-29 17:15:22 -0400216 extern void scsi_evt_thread(struct work_struct *work);
Jens Axboe9937a5e2011-05-17 11:04:44 +0200217 extern void scsi_requeue_run_queue(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
Jes Sorensen24669f752006-01-16 10:31:18 -0500219 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 GFP_ATOMIC);
221 if (!sdev)
222 goto out;
223
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 sdev->vendor = scsi_null_device_strs;
225 sdev->model = scsi_null_device_strs;
226 sdev->rev = scsi_null_device_strs;
227 sdev->host = shost;
Vasu Dev4a840672009-10-22 15:46:33 -0700228 sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 sdev->id = starget->id;
230 sdev->lun = lun;
231 sdev->channel = starget->channel;
232 sdev->sdev_state = SDEV_CREATED;
233 INIT_LIST_HEAD(&sdev->siblings);
234 INIT_LIST_HEAD(&sdev->same_target_siblings);
235 INIT_LIST_HEAD(&sdev->cmd_list);
236 INIT_LIST_HEAD(&sdev->starved_entry);
Jeff Garzika341cd02007-10-29 17:15:22 -0400237 INIT_LIST_HEAD(&sdev->event_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 spin_lock_init(&sdev->list_lock);
Hannes Reinecke09e2b0b2015-11-09 13:24:28 +0100239 mutex_init(&sdev->inquiry_mutex);
Jeff Garzika341cd02007-10-29 17:15:22 -0400240 INIT_WORK(&sdev->event_work, scsi_evt_thread);
Jens Axboe9937a5e2011-05-17 11:04:44 +0200241 INIT_WORK(&sdev->requeue_work, scsi_requeue_run_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
243 sdev->sdev_gendev.parent = get_device(&starget->dev);
244 sdev->sdev_target = starget;
245
246 /* usually NULL and set by ->slave_alloc instead */
247 sdev->hostdata = hostdata;
248
249 /* if the device needs this changing, it may do so in the
250 * slave_configure function */
251 sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
252
253 /*
254 * Some low level driver could use device->type
255 */
256 sdev->type = -1;
257
258 /*
259 * Assume that the device will have handshaking problems,
260 * and then fix this field later if it turns out it
261 * doesn't
262 */
263 sdev->borken = 1;
264
Christoph Hellwigd2852032014-01-17 12:06:53 +0100265 if (shost_use_blk_mq(shost))
266 sdev->request_queue = scsi_mq_alloc_queue(sdev);
267 else
268 sdev->request_queue = scsi_alloc_queue(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 if (!sdev->request_queue) {
270 /* release fn is set up in scsi_sysfs_device_initialise, so
271 * have to free and put manually here */
272 put_device(&starget->dev);
Dave Jones93f560892006-03-09 10:21:27 -0500273 kfree(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 goto out;
275 }
Tejun Heo09ac46c2011-12-14 00:33:38 +0100276 WARN_ON_ONCE(!blk_get_queue(sdev->request_queue));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 sdev->request_queue->queuedata = sdev;
Christoph Hellwig2ecb2042014-11-03 14:09:02 +0100278
Christoph Hellwig64d513a2015-10-08 09:28:04 +0100279 if (!shost_use_blk_mq(sdev->host)) {
Christoph Hellwig2ecb2042014-11-03 14:09:02 +0100280 blk_queue_init_tags(sdev->request_queue,
Shaohua Liee1b6f72015-01-15 17:32:25 -0800281 sdev->host->cmd_per_lun, shost->bqt,
282 shost->hostt->tag_alloc_policy);
Christoph Hellwig2ecb2042014-11-03 14:09:02 +0100283 }
James Bottomleyef10b162015-04-26 11:52:46 -0700284 scsi_change_queue_depth(sdev, sdev->host->cmd_per_lun ?
285 sdev->host->cmd_per_lun : 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
287 scsi_sysfs_device_initialize(sdev);
288
289 if (shost->hostt->slave_alloc) {
290 ret = shost->hostt->slave_alloc(sdev);
291 if (ret) {
292 /*
293 * if LLDD reports slave not present, don't clutter
294 * console with alloc failure messages
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 */
296 if (ret == -ENXIO)
297 display_failure_msg = 0;
298 goto out_device_destroy;
299 }
300 }
301
302 return sdev;
303
304out_device_destroy:
James Bottomley4e6c82b2011-11-07 08:51:24 -0600305 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306out:
307 if (display_failure_msg)
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700308 printk(ALLOC_FAILURE_MSG, __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 return NULL;
310}
311
James Bottomley643eb2d2008-03-22 22:42:27 -0500312static void scsi_target_destroy(struct scsi_target *starget)
313{
314 struct device *dev = &starget->dev;
315 struct Scsi_Host *shost = dev_to_shost(dev->parent);
316 unsigned long flags;
317
James Bottomleyf2495e22014-01-21 07:01:41 -0800318 starget->state = STARGET_DEL;
James Bottomley643eb2d2008-03-22 22:42:27 -0500319 transport_destroy_device(dev);
320 spin_lock_irqsave(shost->host_lock, flags);
321 if (shost->hostt->target_destroy)
322 shost->hostt->target_destroy(starget);
323 list_del_init(&starget->siblings);
324 spin_unlock_irqrestore(shost->host_lock, flags);
325 put_device(dev);
326}
327
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328static void scsi_target_dev_release(struct device *dev)
329{
330 struct device *parent = dev->parent;
331 struct scsi_target *starget = to_scsi_target(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500332
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 kfree(starget);
334 put_device(parent);
335}
336
Adrian Bunk453cd0f2008-07-03 23:47:33 -0700337static struct device_type scsi_target_type = {
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100338 .name = "scsi_target",
339 .release = scsi_target_dev_release,
340};
341
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342int scsi_is_target_device(const struct device *dev)
343{
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100344 return dev->type == &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345}
346EXPORT_SYMBOL(scsi_is_target_device);
347
348static struct scsi_target *__scsi_find_target(struct device *parent,
349 int channel, uint id)
350{
351 struct scsi_target *starget, *found_starget = NULL;
352 struct Scsi_Host *shost = dev_to_shost(parent);
353 /*
354 * Search for an existing target for this sdev.
355 */
356 list_for_each_entry(starget, &shost->__targets, siblings) {
357 if (starget->id == id &&
358 starget->channel == channel) {
359 found_starget = starget;
360 break;
361 }
362 }
363 if (found_starget)
364 get_device(&found_starget->dev);
365
366 return found_starget;
367}
368
James Bottomley884d25c2006-09-05 16:26:41 -0500369/**
James Bottomleye63ed0d2014-01-21 07:00:50 -0800370 * scsi_target_reap_ref_release - remove target from visibility
371 * @kref: the reap_ref in the target being released
372 *
373 * Called on last put of reap_ref, which is the indication that no device
374 * under this target is visible anymore, so render the target invisible in
375 * sysfs. Note: we have to be in user context here because the target reaps
376 * should be done in places where the scsi device visibility is being removed.
377 */
378static void scsi_target_reap_ref_release(struct kref *kref)
379{
380 struct scsi_target *starget
381 = container_of(kref, struct scsi_target, reap_ref);
382
James Bottomleyf2495e22014-01-21 07:01:41 -0800383 /*
384 * if we get here and the target is still in the CREATED state that
385 * means it was allocated but never made visible (because a scan
386 * turned up no LUNs), so don't call device_del() on it.
387 */
388 if (starget->state != STARGET_CREATED) {
389 transport_remove_device(&starget->dev);
390 device_del(&starget->dev);
391 }
James Bottomleye63ed0d2014-01-21 07:00:50 -0800392 scsi_target_destroy(starget);
393}
394
395static void scsi_target_reap_ref_put(struct scsi_target *starget)
396{
397 kref_put(&starget->reap_ref, scsi_target_reap_ref_release);
398}
399
400/**
James Bottomley884d25c2006-09-05 16:26:41 -0500401 * scsi_alloc_target - allocate a new or find an existing target
402 * @parent: parent of the target (need not be a scsi host)
403 * @channel: target channel number (zero if no channels)
404 * @id: target id number
405 *
406 * Return an existing target if one exists, provided it hasn't already
407 * gone into STARGET_DEL state, otherwise allocate a new target.
408 *
409 * The target is returned with an incremented reference, so the caller
410 * is responsible for both reaping and doing a last put
411 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412static struct scsi_target *scsi_alloc_target(struct device *parent,
413 int channel, uint id)
414{
415 struct Scsi_Host *shost = dev_to_shost(parent);
416 struct device *dev = NULL;
417 unsigned long flags;
418 const int size = sizeof(struct scsi_target)
419 + shost->transportt->target_size;
James.Smart@Emulex.Com5c44cd22005-06-10 22:24:30 -0400420 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 struct scsi_target *found_target;
James Bottomleye63ed0d2014-01-21 07:00:50 -0800422 int error, ref_got;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
Jes Sorensen24669f752006-01-16 10:31:18 -0500424 starget = kzalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 if (!starget) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700426 printk(KERN_ERR "%s: allocation failure\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 return NULL;
428 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 dev = &starget->dev;
430 device_initialize(dev);
James Bottomleye63ed0d2014-01-21 07:00:50 -0800431 kref_init(&starget->reap_ref);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 dev->parent = get_device(parent);
Kay Sievers71610f52008-12-03 22:41:36 +0100433 dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id);
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100434 dev->bus = &scsi_bus_type;
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100435 dev->type = &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 starget->id = id;
437 starget->channel = channel;
Mike Christief0c0a372008-08-17 15:24:38 -0500438 starget->can_queue = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 INIT_LIST_HEAD(&starget->siblings);
440 INIT_LIST_HEAD(&starget->devices);
James Bottomley643eb2d2008-03-22 22:42:27 -0500441 starget->state = STARGET_CREATED;
Alan Stern7c9d6f12007-01-08 11:12:32 -0500442 starget->scsi_level = SCSI_2;
Edward Gogginc53a2842009-04-09 10:02:22 -0700443 starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED;
James Bottomleyffedb452006-02-23 14:27:18 -0600444 retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 spin_lock_irqsave(shost->host_lock, flags);
446
447 found_target = __scsi_find_target(parent, channel, id);
448 if (found_target)
449 goto found;
450
451 list_add_tail(&starget->siblings, &shost->__targets);
452 spin_unlock_irqrestore(shost->host_lock, flags);
453 /* allocate and add */
James Bottomleya283bd32005-05-24 12:06:38 -0500454 transport_setup_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500455 if (shost->hostt->target_alloc) {
Brian King32f95792006-02-22 14:28:24 -0600456 error = shost->hostt->target_alloc(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500457
458 if(error) {
459 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
460 /* don't want scsi_target_reap to do the final
461 * put because it will be under the host lock */
James Bottomley643eb2d2008-03-22 22:42:27 -0500462 scsi_target_destroy(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500463 return NULL;
464 }
465 }
James Bottomley884d25c2006-09-05 16:26:41 -0500466 get_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500467
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 return starget;
469
470 found:
James Bottomleye63ed0d2014-01-21 07:00:50 -0800471 /*
472 * release routine already fired if kref is zero, so if we can still
473 * take the reference, the target must be alive. If we can't, it must
474 * be dying and we need to wait for a new target
475 */
476 ref_got = kref_get_unless_zero(&found_target->reap_ref);
477
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 spin_unlock_irqrestore(shost->host_lock, flags);
James Bottomleye63ed0d2014-01-21 07:00:50 -0800479 if (ref_got) {
Alan Stern12fb8c12010-03-18 15:41:22 -0400480 put_device(dev);
James Bottomleyffedb452006-02-23 14:27:18 -0600481 return found_target;
482 }
James Bottomleye63ed0d2014-01-21 07:00:50 -0800483 /*
484 * Unfortunately, we found a dying target; need to wait until it's
485 * dead before we can get a new one. There is an anomaly here. We
486 * *should* call scsi_target_reap() to balance the kref_get() of the
487 * reap_ref above. However, since the target being released, it's
488 * already invisible and the reap_ref is irrelevant. If we call
489 * scsi_target_reap() we might spuriously do another device_del() on
490 * an already invisible target.
491 */
James Bottomleyffedb452006-02-23 14:27:18 -0600492 put_device(&found_target->dev);
James Bottomleye63ed0d2014-01-21 07:00:50 -0800493 /*
494 * length of time is irrelevant here, we just want to yield the CPU
495 * for a tick to avoid busy waiting for the target to die.
496 */
497 msleep(1);
James Bottomleyffedb452006-02-23 14:27:18 -0600498 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499}
500
501/**
502 * scsi_target_reap - check to see if target is in use and destroy if not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 * @starget: target to be checked
504 *
505 * This is used after removing a LUN or doing a last put of the target
506 * it checks atomically that nothing is using the target and removes
507 * it if so.
508 */
509void scsi_target_reap(struct scsi_target *starget)
510{
James Bottomleyf2495e22014-01-21 07:01:41 -0800511 /*
512 * serious problem if this triggers: STARGET_DEL is only set in the if
513 * the reap_ref drops to zero, so we're trying to do another final put
514 * on an already released kref
515 */
James Bottomleye63ed0d2014-01-21 07:00:50 -0800516 BUG_ON(starget->state == STARGET_DEL);
James Bottomleyf2495e22014-01-21 07:01:41 -0800517 scsi_target_reap_ref_put(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518}
519
520/**
Alan Sterne5b3cd42006-08-21 15:53:25 -0400521 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
522 * @s: INQUIRY result string to sanitize
523 * @len: length of the string
524 *
525 * Description:
526 * The SCSI spec says that INQUIRY vendor, product, and revision
527 * strings must consist entirely of graphic ASCII characters,
528 * padded on the right with spaces. Since not all devices obey
529 * this rule, we will replace non-graphic or non-ASCII characters
530 * with spaces. Exception: a NUL character is interpreted as a
531 * string terminator, so all the following characters are set to
532 * spaces.
533 **/
534static void sanitize_inquiry_string(unsigned char *s, int len)
535{
536 int terminated = 0;
537
538 for (; len > 0; (--len, ++s)) {
539 if (*s == 0)
540 terminated = 1;
541 if (terminated || *s < 0x20 || *s > 0x7e)
542 *s = ' ';
543 }
544}
545
546/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
James Bottomley39216032005-06-15 18:48:29 -0500548 * @sdev: scsi_device to probe
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 * @inq_result: area to store the INQUIRY result
James Bottomley39216032005-06-15 18:48:29 -0500550 * @result_len: len of inq_result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 * @bflags: store any bflags found here
552 *
553 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500554 * Probe the lun associated with @req using a standard SCSI INQUIRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 *
James Bottomley39216032005-06-15 18:48:29 -0500556 * If the INQUIRY is successful, zero is returned and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100558 * are copied to the scsi_device any flags value is stored in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400560static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
James Bottomley39216032005-06-15 18:48:29 -0500561 int result_len, int *bflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
564 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
565 int response_len = 0;
James Bottomley39216032005-06-15 18:48:29 -0500566 int pass, count, result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 struct scsi_sense_hdr sshdr;
568
569 *bflags = 0;
570
571 /* Perform up to 3 passes. The first pass uses a conservative
572 * transfer length of 36 unless sdev->inquiry_len specifies a
573 * different value. */
574 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
575 try_inquiry_len = first_inquiry_len;
576 pass = 1;
577
578 next_pass:
James Bottomley9ccfc752005-10-02 11:45:08 -0500579 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
580 "scsi scan: INQUIRY pass %d length %d\n",
581 pass, try_inquiry_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582
583 /* Each pass gets up to three chances to ignore Unit Attention */
584 for (count = 0; count < 3; ++count) {
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900585 int resid;
586
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 memset(scsi_cmd, 0, 6);
588 scsi_cmd[0] = INQUIRY;
589 scsi_cmd[4] = (unsigned char) try_inquiry_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590
591 memset(inq_result, 0, try_inquiry_len);
James Bottomley39216032005-06-15 18:48:29 -0500592
593 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -0500594 inq_result, try_inquiry_len, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900595 HZ / 2 + HZ * scsi_inq_timeout, 3,
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900596 &resid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597
Hannes Reinecke91921e02014-06-25 16:39:59 +0200598 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
599 "scsi scan: INQUIRY %s with code 0x%x\n",
James Bottomley39216032005-06-15 18:48:29 -0500600 result ? "failed" : "successful", result));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601
James Bottomley39216032005-06-15 18:48:29 -0500602 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 /*
604 * not-ready to ready transition [asc/ascq=0x28/0x0]
605 * or power-on, reset [asc/ascq=0x29/0x0], continue.
606 * INQUIRY should not yield UNIT_ATTENTION
607 * but many buggy devices do so anyway.
608 */
James Bottomley39216032005-06-15 18:48:29 -0500609 if ((driver_byte(result) & DRIVER_SENSE) &&
James Bottomleyea73a9f2005-08-28 11:33:52 -0500610 scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 if ((sshdr.sense_key == UNIT_ATTENTION) &&
612 ((sshdr.asc == 0x28) ||
613 (sshdr.asc == 0x29)) &&
614 (sshdr.ascq == 0))
615 continue;
616 }
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900617 } else {
618 /*
619 * if nothing was transferred, we try
620 * again. It's a workaround for some USB
621 * devices.
622 */
623 if (resid == try_inquiry_len)
624 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 }
626 break;
627 }
628
James Bottomley39216032005-06-15 18:48:29 -0500629 if (result == 0) {
Alan Sterne5b3cd42006-08-21 15:53:25 -0400630 sanitize_inquiry_string(&inq_result[8], 8);
631 sanitize_inquiry_string(&inq_result[16], 16);
632 sanitize_inquiry_string(&inq_result[32], 4);
633
634 response_len = inq_result[4] + 5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 if (response_len > 255)
636 response_len = first_inquiry_len; /* sanity */
637
638 /*
639 * Get any flags for this device.
640 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100641 * XXX add a bflags to scsi_device, and replace the
642 * corresponding bit fields in scsi_device, so bflags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 * need not be passed as an argument.
644 */
645 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
646 &inq_result[16]);
647
648 /* When the first pass succeeds we gain information about
649 * what larger transfer lengths might work. */
650 if (pass == 1) {
651 if (BLIST_INQUIRY_36 & *bflags)
652 next_inquiry_len = 36;
653 else if (BLIST_INQUIRY_58 & *bflags)
654 next_inquiry_len = 58;
655 else if (sdev->inquiry_len)
656 next_inquiry_len = sdev->inquiry_len;
657 else
658 next_inquiry_len = response_len;
659
660 /* If more data is available perform the second pass */
661 if (next_inquiry_len > try_inquiry_len) {
662 try_inquiry_len = next_inquiry_len;
663 pass = 2;
664 goto next_pass;
665 }
666 }
667
668 } else if (pass == 2) {
Hannes Reinecke91921e02014-06-25 16:39:59 +0200669 sdev_printk(KERN_INFO, sdev,
670 "scsi scan: %d byte inquiry failed. "
671 "Consider BLIST_INQUIRY_36 for this device\n",
672 try_inquiry_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673
674 /* If this pass failed, the third pass goes back and transfers
675 * the same amount as we successfully got in the first pass. */
676 try_inquiry_len = first_inquiry_len;
677 pass = 3;
678 goto next_pass;
679 }
680
681 /* If the last transfer attempt got an error, assume the
682 * peripheral doesn't exist or is dead. */
James Bottomley39216032005-06-15 18:48:29 -0500683 if (result)
684 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685
686 /* Don't report any more data than the device says is valid */
687 sdev->inquiry_len = min(try_inquiry_len, response_len);
688
689 /*
690 * XXX Abort if the response length is less than 36? If less than
691 * 32, the lookup of the device flags (above) could be invalid,
692 * and it would be possible to take an incorrect action - we do
693 * not want to hang because of a short INQUIRY. On the flip side,
694 * if the device is spun down or becoming ready (and so it gives a
695 * short INQUIRY), an abort here prevents any further use of the
696 * device, including spin up.
697 *
Alan Sterne423ee32007-02-16 01:46:38 -0800698 * On the whole, the best approach seems to be to assume the first
699 * 36 bytes are valid no matter what the device says. That's
700 * better than copying < 36 bytes to the inquiry-result buffer
701 * and displaying garbage for the Vendor, Product, or Revision
702 * strings.
703 */
704 if (sdev->inquiry_len < 36) {
Vitaly Kuznetsova35bb442015-11-19 14:17:06 +0100705 if (!sdev->host->short_inquiry) {
706 shost_printk(KERN_INFO, sdev->host,
707 "scsi scan: INQUIRY result too short (%d),"
708 " using 36\n", sdev->inquiry_len);
709 sdev->host->short_inquiry = 1;
710 }
Alan Sterne423ee32007-02-16 01:46:38 -0800711 sdev->inquiry_len = 36;
712 }
713
714 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 * Related to the above issue:
716 *
717 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
718 * and if not ready, sent a START_STOP to start (maybe spin up) and
719 * then send the INQUIRY again, since the INQUIRY can change after
720 * a device is initialized.
721 *
722 * Ideally, start a device if explicitly asked to do so. This
723 * assumes that a device is spun up on power on, spun down on
724 * request, and then spun up on request.
725 */
726
727 /*
728 * The scanning code needs to know the scsi_level, even if no
729 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
730 * non-zero LUNs can be scanned.
731 */
732 sdev->scsi_level = inq_result[2] & 0x07;
733 if (sdev->scsi_level >= 2 ||
734 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
735 sdev->scsi_level++;
James Bottomley6f3a2022005-09-22 20:33:28 -0500736 sdev->sdev_target->scsi_level = sdev->scsi_level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737
Alan Stern50c4e962014-09-02 11:35:50 -0400738 /*
739 * If SCSI-2 or lower, and if the transport requires it,
740 * store the LUN value in CDB[1].
741 */
742 sdev->lun_in_cdb = 0;
743 if (sdev->scsi_level <= SCSI_2 &&
744 sdev->scsi_level != SCSI_UNKNOWN &&
745 !sdev->host->no_scsi2_lun_in_cdb)
746 sdev->lun_in_cdb = 1;
747
James Bottomley39216032005-06-15 18:48:29 -0500748 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749}
750
751/**
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100752 * scsi_add_lun - allocate and fully initialze a scsi_device
Matthew Wilcox6d877682007-07-11 12:54:55 -0600753 * @sdev: holds information to be stored in the new scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 * @inq_result: holds the result of a previous INQUIRY to the LUN
755 * @bflags: black/white list flag
Matthew Wilcox6d877682007-07-11 12:54:55 -0600756 * @async: 1 if this device is being scanned asynchronously
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 *
758 * Description:
Matthew Wilcox6d877682007-07-11 12:54:55 -0600759 * Initialize the scsi_device @sdev. Optionally set fields based
760 * on values in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 *
762 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100763 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
764 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400766static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600767 int *bflags, int async)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768{
James Bottomley6f4267e2008-08-22 16:53:31 -0500769 int ret;
770
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 /*
772 * XXX do not save the inquiry, since it can change underneath us,
773 * save just vendor/model/rev.
774 *
775 * Rather than save it and have an ioctl that retrieves the saved
776 * value, have an ioctl that executes the same INQUIRY code used
777 * in scsi_probe_lun, let user level programs doing INQUIRY
778 * scanning run at their own risk, or supply a user level program
779 * that can correctly scan.
780 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781
Alan Stern09123d22006-11-10 12:27:57 -0800782 /*
783 * Copy at least 36 bytes of INQUIRY data, so that we don't
784 * dereference unallocated memory when accessing the Vendor,
785 * Product, and Revision strings. Badly behaved devices may set
786 * the INQUIRY Additional Length byte to a small value, indicating
787 * these strings are invalid, but often they contain plausible data
788 * nonetheless. It doesn't matter if the device sent < 36 bytes
789 * total, since scsi_probe_lun() initializes inq_result with 0s.
790 */
791 sdev->inquiry = kmemdup(inq_result,
792 max_t(size_t, sdev->inquiry_len, 36),
793 GFP_ATOMIC);
794 if (sdev->inquiry == NULL)
795 return SCSI_SCAN_NO_RESPONSE;
796
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 sdev->vendor = (char *) (sdev->inquiry + 8);
798 sdev->model = (char *) (sdev->inquiry + 16);
799 sdev->rev = (char *) (sdev->inquiry + 32);
800
James Bottomley14216562012-07-25 23:55:55 +0400801 if (strncmp(sdev->vendor, "ATA ", 8) == 0) {
802 /*
803 * sata emulation layer device. This is a hack to work around
804 * the SATL power management specifications which state that
805 * when the SATL detects the device has gone into standby
806 * mode, it shall respond with NOT READY.
807 */
808 sdev->allow_restart = 1;
809 }
810
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 if (*bflags & BLIST_ISROM) {
Matthew Wilcox6d877682007-07-11 12:54:55 -0600812 sdev->type = TYPE_ROM;
813 sdev->removable = 1;
814 } else {
815 sdev->type = (inq_result[0] & 0x1f);
816 sdev->removable = (inq_result[1] & 0x80) >> 7;
Subhash Jadavani45341ca2014-09-25 15:32:19 +0300817
818 /*
819 * some devices may respond with wrong type for
820 * well-known logical units. Force well-known type
821 * to enumerate them correctly.
822 */
823 if (scsi_is_wlun(sdev->lun) && sdev->type != TYPE_WLUN) {
824 sdev_printk(KERN_WARNING, sdev,
825 "%s: correcting incorrect peripheral device type 0x%x for W-LUN 0x%16xhN\n",
826 __func__, sdev->type, (unsigned int)sdev->lun);
827 sdev->type = TYPE_WLUN;
828 }
829
Matthew Wilcox6d877682007-07-11 12:54:55 -0600830 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831
Matthew Wilcox6d877682007-07-11 12:54:55 -0600832 if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {
833 /* RBC and MMC devices can return SCSI-3 compliance and yet
834 * still not support REPORT LUNS, so make them act as
835 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
836 * specifically set */
837 if ((*bflags & BLIST_REPORTLUN2) == 0)
838 *bflags |= BLIST_NOREPORTLUN;
839 }
840
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 /*
842 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
843 * spec says: The device server is capable of supporting the
844 * specified peripheral device type on this logical unit. However,
845 * the physical device is not currently connected to this logical
846 * unit.
847 *
848 * The above is vague, as it implies that we could treat 001 and
849 * 011 the same. Stay compatible with previous code, and create a
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100850 * scsi_device for a PQ of 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 *
852 * Don't set the device offline here; rather let the upper
853 * level drivers eval the PQ to decide whether they should
854 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
855 */
856
857 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 sdev->lockable = sdev->removable;
859 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
860
Matthew Wilcox6d877682007-07-11 12:54:55 -0600861 if (sdev->scsi_level >= SCSI_3 ||
862 (sdev->inquiry_len > 56 && inq_result[56] & 0x04))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 sdev->ppr = 1;
864 if (inq_result[7] & 0x60)
865 sdev->wdtr = 1;
866 if (inq_result[7] & 0x10)
867 sdev->sdtr = 1;
868
James Bottomley19ac0db2006-08-06 18:15:22 -0500869 sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d "
Matthew Wilcox4ff36712006-07-04 12:15:20 -0600870 "ANSI: %d%s\n", scsi_device_type(sdev->type),
871 sdev->vendor, sdev->model, sdev->rev,
872 sdev->inq_periph_qual, inq_result[2] & 0x07,
873 (inq_result[3] & 0x0f) == 1 ? " CCS" : "");
874
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
Christoph Hellwigc8b09f62014-11-03 20:15:14 +0100876 !(*bflags & BLIST_NOTQ)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 sdev->tagged_supported = 1;
Christoph Hellwigc8b09f62014-11-03 20:15:14 +0100878 sdev->simple_tags = 1;
879 }
Matthew Wilcox6d877682007-07-11 12:54:55 -0600880
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 /*
882 * Some devices (Texel CD ROM drives) have handshaking problems
883 * when used with the Seagate controllers. borken is initialized
884 * to 1, and then set it to 0 here.
885 */
886 if ((*bflags & BLIST_BORKEN) == 0)
887 sdev->borken = 0;
888
Matthew Wilcox6d877682007-07-11 12:54:55 -0600889 if (*bflags & BLIST_NO_ULD_ATTACH)
890 sdev->no_uld_attach = 1;
891
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 /*
893 * Apparently some really broken devices (contrary to the SCSI
894 * standards) need to be selected without asserting ATN
895 */
896 if (*bflags & BLIST_SELECT_NO_ATN)
897 sdev->select_no_atn = 1;
898
899 /*
James Bottomley4d7db042006-03-31 20:07:45 -0600900 * Maximum 512 sector transfer length
901 * broken RA4x00 Compaq Disk Array
902 */
903 if (*bflags & BLIST_MAX_512)
Martin K. Petersen086fa5f2010-02-26 00:20:38 -0500904 blk_queue_max_hw_sectors(sdev->request_queue, 512);
Mike Christie35e9a9f2015-04-20 22:42:24 -0500905 /*
906 * Max 1024 sector transfer length for targets that report incorrect
907 * max/optimal lengths and relied on the old block layer safe default
908 */
909 else if (*bflags & BLIST_MAX_1024)
910 blk_queue_max_hw_sectors(sdev->request_queue, 1024);
James Bottomley4d7db042006-03-31 20:07:45 -0600911
912 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 * Some devices may not want to have a start command automatically
914 * issued when a device is added.
915 */
916 if (*bflags & BLIST_NOSTARTONADD)
917 sdev->no_start_on_add = 1;
918
919 if (*bflags & BLIST_SINGLELUN)
Tony Battersby25d7c362007-11-12 10:00:44 -0500920 scsi_target(sdev)->single_lun = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 sdev->use_10_for_rw = 1;
923
924 if (*bflags & BLIST_MS_SKIP_PAGE_08)
925 sdev->skip_ms_page_8 = 1;
926
927 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
928 sdev->skip_ms_page_3f = 1;
929
930 if (*bflags & BLIST_USE_10_BYTE_MS)
931 sdev->use_10_for_ms = 1;
932
Janusz Dziemidowicz02134362014-07-24 15:48:46 +0200933 /* some devices don't like REPORT SUPPORTED OPERATION CODES
934 * and will simply timeout causing sd_mod init to take a very
935 * very long time */
936 if (*bflags & BLIST_NO_RSOC)
937 sdev->no_report_opcodes = 1;
938
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 /* set the device running here so that slave configure
940 * may do I/O */
James Bottomley6f4267e2008-08-22 16:53:31 -0500941 ret = scsi_device_set_state(sdev, SDEV_RUNNING);
942 if (ret) {
943 ret = scsi_device_set_state(sdev, SDEV_BLOCK);
944
945 if (ret) {
946 sdev_printk(KERN_ERR, sdev,
947 "in wrong state %s to complete scan\n",
948 scsi_device_state_name(sdev->sdev_state));
949 return SCSI_SCAN_NO_RESPONSE;
950 }
951 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952
953 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
954 sdev->use_192_bytes_for_3f = 1;
955
956 if (*bflags & BLIST_NOT_LOCKABLE)
957 sdev->lockable = 0;
958
959 if (*bflags & BLIST_RETRY_HWERROR)
960 sdev->retry_hwerror = 1;
961
Martin K. Petersend974e422012-08-28 14:29:35 -0400962 if (*bflags & BLIST_NO_DIF)
963 sdev->no_dif = 1;
964
Martin K. Petersen0816c922013-05-10 10:36:04 -0400965 sdev->eh_timeout = SCSI_DEFAULT_EH_TIMEOUT;
966
Martin K. Petersenc1d40a52014-07-15 12:49:17 -0400967 if (*bflags & BLIST_TRY_VPD_PAGES)
968 sdev->try_vpd_pages = 1;
969 else if (*bflags & BLIST_SKIP_VPD_PAGES)
Martin K. Petersen56f2a802013-04-24 21:19:47 -0400970 sdev->skip_vpd_pages = 1;
971
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 transport_configure_device(&sdev->sdev_gendev);
973
Christoph Hellwig93805092006-02-17 12:11:29 +0100974 if (sdev->host->hostt->slave_configure) {
James Bottomley6f4267e2008-08-22 16:53:31 -0500975 ret = sdev->host->hostt->slave_configure(sdev);
Christoph Hellwig93805092006-02-17 12:11:29 +0100976 if (ret) {
977 /*
978 * if LLDD reports slave not present, don't clutter
979 * console with alloc failure messages
980 */
981 if (ret != -ENXIO) {
982 sdev_printk(KERN_ERR, sdev,
983 "failed to configure device\n");
984 }
985 return SCSI_SCAN_NO_RESPONSE;
986 }
987 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988
Hannes Reineckeb3ae8782014-03-15 09:51:49 +0100989 if (sdev->scsi_level >= SCSI_3)
990 scsi_attach_vpd(sdev);
991
Vasu Dev4a840672009-10-22 15:46:33 -0700992 sdev->max_queue_depth = sdev->queue_depth;
993
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 /*
995 * Ok, the device is now all set up, we can
996 * register it and tell the rest of the kernel
997 * about it.
998 */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600999 if (!async && scsi_sysfs_add_sdev(sdev) != 0)
Alan Sternb24b1032005-07-27 11:43:46 -07001000 return SCSI_SCAN_NO_RESPONSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001
1002 return SCSI_SCAN_LUN_PRESENT;
1003}
1004
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001005#ifdef CONFIG_SCSI_LOGGING
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001006/**
Rob Landleyeb448202007-11-03 13:30:39 -05001007 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001008 * @buf: Output buffer with at least end-first+1 bytes of space
1009 * @inq: Inquiry buffer (input)
1010 * @first: Offset of string into inq
1011 * @end: Index after last character in inq
1012 */
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001013static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001014 unsigned first, unsigned end)
1015{
1016 unsigned term = 0, idx;
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001017
1018 for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
1019 if (inq[idx+first] > ' ') {
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001020 buf[idx] = inq[idx+first];
1021 term = idx+1;
1022 } else {
1023 buf[idx] = ' ';
1024 }
1025 }
1026 buf[term] = 0;
1027 return buf;
1028}
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001029#endif
James Bottomley6f3a2022005-09-22 20:33:28 -05001030
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031/**
1032 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
1033 * @starget: pointer to target device structure
1034 * @lun: LUN of target device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 * @bflagsp: store bflags here if not NULL
Rob Landleyeb448202007-11-03 13:30:39 -05001036 * @sdevp: probe the LUN corresponding to this scsi_device
1037 * @rescan: if nonzero skip some code only needed on first scan
1038 * @hostdata: passed to scsi_alloc_sdev()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 *
1040 * Description:
1041 * Call scsi_probe_lun, if a LUN with an attached device is found,
1042 * allocate and set it up by calling scsi_add_lun.
1043 *
1044 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001045 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
1047 * attached at the LUN
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001048 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 **/
1050static int scsi_probe_and_add_lun(struct scsi_target *starget,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001051 u64 lun, int *bflagsp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 struct scsi_device **sdevp, int rescan,
1053 void *hostdata)
1054{
1055 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 unsigned char *result;
James Bottomley39216032005-06-15 18:48:29 -05001057 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1059
1060 /*
1061 * The rescan flag is used as an optimization, the first scan of a
1062 * host adapter calls into here with rescan == 0.
1063 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001064 sdev = scsi_device_lookup_by_target(starget, lun);
1065 if (sdev) {
James Bottomley0f1d87a2008-08-22 16:43:59 -05001066 if (rescan || !scsi_device_created(sdev)) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001067 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 "scsi scan: device exists on %s\n",
Kay Sievers71610f52008-12-03 22:41:36 +01001069 dev_name(&sdev->sdev_gendev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 if (sdevp)
1071 *sdevp = sdev;
1072 else
1073 scsi_device_put(sdev);
1074
1075 if (bflagsp)
1076 *bflagsp = scsi_get_device_flags(sdev,
1077 sdev->vendor,
1078 sdev->model);
1079 return SCSI_SCAN_LUN_PRESENT;
1080 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001081 scsi_device_put(sdev);
1082 } else
1083 sdev = scsi_alloc_sdev(starget, lun, hostdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 if (!sdev)
1085 goto out;
James Bottomley39216032005-06-15 18:48:29 -05001086
1087 result = kmalloc(result_len, GFP_ATOMIC |
Al Virobc861202005-04-24 12:28:34 -07001088 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 if (!result)
James Bottomley39216032005-06-15 18:48:29 -05001090 goto out_free_sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091
James Bottomley39216032005-06-15 18:48:29 -05001092 if (scsi_probe_lun(sdev, result, result_len, &bflags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 goto out_free_result;
1094
Kurt Garloff4186ab12006-04-03 15:16:48 +02001095 if (bflagsp)
1096 *bflagsp = bflags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 /*
1098 * result contains valid SCSI INQUIRY data.
1099 */
Kurt Garloff13f7e5a2006-04-03 15:20:08 +02001100 if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 /*
1102 * For a Peripheral qualifier 3 (011b), the SCSI
1103 * spec says: The device server is not capable of
1104 * supporting a physical device on this logical
1105 * unit.
1106 *
1107 * For disks, this implies that there is no
1108 * logical disk configured at sdev->lun, but there
1109 * is a target id responding.
1110 */
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001111 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
1112 " peripheral qualifier of 3, device not"
1113 " added\n"))
1114 if (lun == 0) {
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001115 SCSI_LOG_SCAN_BUS(1, {
1116 unsigned char vend[9];
1117 unsigned char mod[17];
1118
1119 sdev_printk(KERN_INFO, sdev,
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001120 "scsi scan: consider passing scsi_mod."
Kurt Garloff3424a652007-01-09 02:28:54 +01001121 "dev_flags=%s:%s:0x240 or 0x1000240\n",
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001122 scsi_inq_str(vend, result, 8, 16),
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001123 scsi_inq_str(mod, result, 16, 32));
1124 });
James Bottomley643eb2d2008-03-22 22:42:27 -05001125
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001126 }
James Bottomley643eb2d2008-03-22 22:42:27 -05001127
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 res = SCSI_SCAN_TARGET_PRESENT;
1129 goto out_free_result;
1130 }
1131
Alan Stern1bfc5d92006-02-09 15:26:18 -05001132 /*
dave wysochanski84961f22006-08-09 14:56:32 -04001133 * Some targets may set slight variations of PQ and PDT to signal
1134 * that no LUN is present, so don't add sdev in these cases.
1135 * Two specific examples are:
1136 * 1) NetApp targets: return PQ=1, PDT=0x1f
1137 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1138 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1139 *
1140 * References:
1141 * 1) SCSI SPC-3, pp. 145-146
1142 * PQ=1: "A peripheral device having the specified peripheral
1143 * device type is not connected to this logical unit. However, the
1144 * device server is capable of supporting the specified peripheral
1145 * device type on this logical unit."
1146 * PDT=0x1f: "Unknown or no device type"
1147 * 2) USB UFI 1.0, p. 20
1148 * PDT=00h Direct-access device (floppy)
1149 * PDT=1Fh none (no FDD connected to the requested logical unit)
Alan Stern1bfc5d92006-02-09 15:26:18 -05001150 */
dave wysochanski84961f22006-08-09 14:56:32 -04001151 if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) &&
James Bottomley01b291b2008-08-21 15:14:14 -05001152 (result[0] & 0x1f) == 0x1f &&
1153 !scsi_is_wlun(lun)) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001154 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
Alan Stern1bfc5d92006-02-09 15:26:18 -05001155 "scsi scan: peripheral device type"
1156 " of 31, no device added\n"));
1157 res = SCSI_SCAN_TARGET_PRESENT;
1158 goto out_free_result;
1159 }
1160
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001161 res = scsi_add_lun(sdev, result, &bflags, shost->async_scan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 if (res == SCSI_SCAN_LUN_PRESENT) {
1163 if (bflags & BLIST_KEY) {
1164 sdev->lockable = 0;
James Bottomley39216032005-06-15 18:48:29 -05001165 scsi_unlock_floptical(sdev, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 }
1168
1169 out_free_result:
1170 kfree(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 out_free_sdev:
1172 if (res == SCSI_SCAN_LUN_PRESENT) {
1173 if (sdevp) {
Alan Sternb70d37b2005-07-26 10:30:40 -04001174 if (scsi_device_get(sdev) == 0) {
1175 *sdevp = sdev;
1176 } else {
1177 __scsi_remove_device(sdev);
1178 res = SCSI_SCAN_NO_RESPONSE;
1179 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001181 } else
James Bottomley860dc732009-11-19 17:48:29 -05001182 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 out:
1184 return res;
1185}
1186
1187/**
1188 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1189 * @starget: pointer to target structure to scan
1190 * @bflags: black/white list flag for LUN 0
Rob Landleyeb448202007-11-03 13:30:39 -05001191 * @scsi_level: Which version of the standard does this device adhere to
1192 * @rescan: passed to scsi_probe_add_lun()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193 *
1194 * Description:
1195 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1196 * scanned) to some maximum lun until a LUN is found with no device
1197 * attached. Use the bflags to figure out any oddities.
1198 *
1199 * Modifies sdevscan->lun.
1200 **/
1201static void scsi_sequential_lun_scan(struct scsi_target *starget,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001202 int bflags, int scsi_level, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203{
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001204 uint max_dev_lun;
1205 u64 sparse_lun, lun;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1207
Hannes Reinecke91921e02014-06-25 16:39:59 +02001208 SCSI_LOG_SCAN_BUS(3, starget_printk(KERN_INFO, starget,
1209 "scsi scan: Sequential scan\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210
1211 max_dev_lun = min(max_scsi_luns, shost->max_lun);
1212 /*
1213 * If this device is known to support sparse multiple units,
1214 * override the other settings, and scan all of them. Normally,
1215 * SCSI-3 devices should be scanned via the REPORT LUNS.
1216 */
1217 if (bflags & BLIST_SPARSELUN) {
1218 max_dev_lun = shost->max_lun;
1219 sparse_lun = 1;
1220 } else
1221 sparse_lun = 0;
1222
1223 /*
Mark Knibbsfb0d82f2014-10-09 12:39:40 +01001224 * If less than SCSI_1_CCS, and no special lun scanning, stop
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 * scanning; this matches 2.4 behaviour, but could just be a bug
Mark Knibbsfb0d82f2014-10-09 12:39:40 +01001226 * (to continue scanning a SCSI_1_CCS device).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 *
1228 * This test is broken. We might not have any device on lun0 for
1229 * a sparselun device, and if that's the case then how would we
1230 * know the real scsi_level, eh? It might make sense to just not
1231 * scan any SCSI_1 device for non-0 luns, but that check would best
1232 * go into scsi_alloc_sdev() and just have it return null when asked
1233 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1234 *
1235 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1236 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1237 == 0))
1238 return;
1239 */
1240 /*
1241 * If this device is known to support multiple units, override
1242 * the other settings, and scan all of them.
1243 */
1244 if (bflags & BLIST_FORCELUN)
1245 max_dev_lun = shost->max_lun;
1246 /*
1247 * REGAL CDC-4X: avoid hang after LUN 4
1248 */
1249 if (bflags & BLIST_MAX5LUN)
1250 max_dev_lun = min(5U, max_dev_lun);
1251 /*
1252 * Do not scan SCSI-2 or lower device past LUN 7, unless
1253 * BLIST_LARGELUN.
1254 */
1255 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
1256 max_dev_lun = min(8U, max_dev_lun);
1257
1258 /*
Hannes Reinecke22ffeb42014-06-03 10:58:53 +02001259 * Stop scanning at 255 unless BLIST_SCSI3LUN
1260 */
1261 if (!(bflags & BLIST_SCSI3LUN))
1262 max_dev_lun = min(256U, max_dev_lun);
1263
1264 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1266 * until we reach the max, or no LUN is found and we are not
1267 * sparse_lun.
1268 */
1269 for (lun = 1; lun < max_dev_lun; ++lun)
1270 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
1271 NULL) != SCSI_SCAN_LUN_PRESENT) &&
1272 !sparse_lun)
1273 return;
1274}
1275
1276/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
Rob Landleyeb448202007-11-03 13:30:39 -05001278 * @starget: which target
1279 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1280 * @rescan: nonzero if we can skip code only needed on first scan
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 *
1282 * Description:
Rob Landleyeb448202007-11-03 13:30:39 -05001283 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1284 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285 *
Rob Landleyeb448202007-11-03 13:30:39 -05001286 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1287 * LUNs even if it's older than SCSI-3.
1288 * If BLIST_NOREPORTLUN is set, return 1 always.
1289 * If BLIST_NOLUN is set, return 0 always.
Alan Stern09b6b512012-01-10 13:43:30 -05001290 * If starget->no_report_luns is set, return 1 always.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291 *
1292 * Return:
1293 * 0: scan completed (or no memory, so further scanning is futile)
Rob Landleyeb448202007-11-03 13:30:39 -05001294 * 1: could not scan with REPORT LUN
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 **/
James Bottomley6f3a2022005-09-22 20:33:28 -05001296static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297 int rescan)
1298{
1299 char devname[64];
1300 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1301 unsigned int length;
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001302 u64 lun;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 unsigned int num_luns;
1304 unsigned int retries;
James Bottomley39216032005-06-15 18:48:29 -05001305 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 struct scsi_lun *lunp, *lun_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 struct scsi_sense_hdr sshdr;
James Bottomley6f3a2022005-09-22 20:33:28 -05001308 struct scsi_device *sdev;
1309 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
Alan Stern2ef89192005-11-08 15:51:55 -05001310 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311
1312 /*
1313 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1314 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1315 * support more than 8 LUNs.
Alan Stern09b6b512012-01-10 13:43:30 -05001316 * Don't attempt if the target doesn't support REPORT LUNS.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317 */
James Bottomley4d7db042006-03-31 20:07:45 -06001318 if (bflags & BLIST_NOREPORTLUN)
1319 return 1;
1320 if (starget->scsi_level < SCSI_2 &&
1321 starget->scsi_level != SCSI_UNKNOWN)
1322 return 1;
1323 if (starget->scsi_level < SCSI_3 &&
1324 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 return 1;
1326 if (bflags & BLIST_NOLUN)
1327 return 0;
Alan Stern09b6b512012-01-10 13:43:30 -05001328 if (starget->no_report_luns)
1329 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330
James Bottomley6f3a2022005-09-22 20:33:28 -05001331 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1332 sdev = scsi_alloc_sdev(starget, 0, NULL);
1333 if (!sdev)
1334 return 0;
Alan Stern75f8ee82010-02-12 12:13:31 -05001335 if (scsi_device_get(sdev)) {
1336 __scsi_remove_device(sdev);
James Bottomley6f3a2022005-09-22 20:33:28 -05001337 return 0;
Alan Stern75f8ee82010-02-12 12:13:31 -05001338 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001339 }
1340
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 sprintf(devname, "host %d channel %d id %d",
James Bottomley6f3a2022005-09-22 20:33:28 -05001342 shost->host_no, sdev->channel, sdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343
1344 /*
1345 * Allocate enough to hold the header (the same size as one scsi_lun)
Rob Eversacd6d732014-12-16 11:01:20 -05001346 * plus the number of luns we are requesting. 511 was the default
1347 * value of the now removed max_report_luns parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 */
Rob Eversacd6d732014-12-16 11:01:20 -05001349 length = (511 + 1) * sizeof(struct scsi_lun);
1350retry:
Rob Everseb9eea02014-12-16 11:01:18 -05001351 lun_data = kmalloc(length, GFP_KERNEL |
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
James Bottomley6f3a2022005-09-22 20:33:28 -05001353 if (!lun_data) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001354 printk(ALLOC_FAILURE_MSG, __func__);
James Bottomley39216032005-06-15 18:48:29 -05001355 goto out;
James Bottomley6f3a2022005-09-22 20:33:28 -05001356 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357
1358 scsi_cmd[0] = REPORT_LUNS;
1359
1360 /*
1361 * bytes 1 - 5: reserved, set to zero.
1362 */
1363 memset(&scsi_cmd[1], 0, 5);
1364
1365 /*
1366 * bytes 6 - 9: length of the command.
1367 */
Rob Evers2a904e52014-12-16 11:01:19 -05001368 put_unaligned_be32(length, &scsi_cmd[6]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369
1370 scsi_cmd[10] = 0; /* reserved */
1371 scsi_cmd[11] = 0; /* control */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372
1373 /*
1374 * We can get a UNIT ATTENTION, for example a power on/reset, so
1375 * retry a few times (like sd.c does for TEST UNIT READY).
1376 * Experience shows some combinations of adapter/devices get at
1377 * least two power on/resets.
1378 *
1379 * Illegal requests (for devices that do not support REPORT LUNS)
1380 * should come through as a check condition, and will not generate
1381 * a retry.
1382 */
1383 for (retries = 0; retries < 3; retries++) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001384 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1385 "scsi scan: Sending REPORT LUNS to (try %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 retries));
James Bottomley39216032005-06-15 18:48:29 -05001387
James Bottomley39216032005-06-15 18:48:29 -05001388 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001389 lun_data, length, &sshdr,
Brian Kingb39c9a662015-09-04 14:47:06 -05001390 SCSI_REPORT_LUNS_TIMEOUT, 3, NULL);
James Bottomley39216032005-06-15 18:48:29 -05001391
Hannes Reinecke91921e02014-06-25 16:39:59 +02001392 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1393 "scsi scan: REPORT LUNS"
1394 " %s (try %d) result 0x%x\n",
1395 result ? "failed" : "successful",
1396 retries, result));
James Bottomley39216032005-06-15 18:48:29 -05001397 if (result == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 break;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001399 else if (scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400 if (sshdr.sense_key != UNIT_ATTENTION)
1401 break;
1402 }
1403 }
1404
James Bottomley39216032005-06-15 18:48:29 -05001405 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 /*
1407 * The device probably does not support a REPORT LUN command
1408 */
Alan Stern2ef89192005-11-08 15:51:55 -05001409 ret = 1;
1410 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412
1413 /*
1414 * Get the length from the first four bytes of lun_data.
1415 */
Rob Eversacd6d732014-12-16 11:01:20 -05001416 if (get_unaligned_be32(lun_data->scsi_lun) +
1417 sizeof(struct scsi_lun) > length) {
1418 length = get_unaligned_be32(lun_data->scsi_lun) +
1419 sizeof(struct scsi_lun);
1420 kfree(lun_data);
1421 goto retry;
1422 }
Rob Evers2a904e52014-12-16 11:01:19 -05001423 length = get_unaligned_be32(lun_data->scsi_lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424
1425 num_luns = (length / sizeof(struct scsi_lun));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001427 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1428 "scsi scan: REPORT LUN scan\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429
1430 /*
1431 * Scan the luns in lun_data. The entry at offset 0 is really
1432 * the header, so start at 1 and go up to and including num_luns.
1433 */
1434 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1435 lun = scsilun_to_int(lunp);
1436
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001437 if (lun > sdev->host->max_lun) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001438 sdev_printk(KERN_WARNING, sdev,
1439 "lun%llu has a LUN larger than"
1440 " allowed by the host adapter\n", lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441 } else {
1442 int res;
1443
1444 res = scsi_probe_and_add_lun(starget,
1445 lun, NULL, NULL, rescan, NULL);
1446 if (res == SCSI_SCAN_NO_RESPONSE) {
1447 /*
1448 * Got some results, but now none, abort.
1449 */
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001450 sdev_printk(KERN_ERR, sdev,
1451 "Unexpected response"
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001452 " from lun %llu while scanning, scan"
1453 " aborted\n", (unsigned long long)lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454 break;
1455 }
1456 }
1457 }
1458
Alan Stern2ef89192005-11-08 15:51:55 -05001459 out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460 kfree(lun_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 out:
James Bottomley6f3a2022005-09-22 20:33:28 -05001462 scsi_device_put(sdev);
James Bottomley0f1d87a2008-08-22 16:43:59 -05001463 if (scsi_device_created(sdev))
James Bottomley6f3a2022005-09-22 20:33:28 -05001464 /*
1465 * the sdev we used didn't appear in the report luns scan
1466 */
James Bottomley860dc732009-11-19 17:48:29 -05001467 __scsi_remove_device(sdev);
Alan Stern2ef89192005-11-08 15:51:55 -05001468 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469}
1470
1471struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001472 uint id, u64 lun, void *hostdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473{
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001474 struct scsi_device *sdev = ERR_PTR(-ENODEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475 struct device *parent = &shost->shost_gendev;
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001476 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477
Matthew Wilcox938e2ac2007-01-15 18:07:09 -07001478 if (strncmp(scsi_scan_type, "none", 4) == 0)
1479 return ERR_PTR(-ENODEV);
1480
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001481 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482 if (!starget)
1483 return ERR_PTR(-ENOMEM);
Alan Sternbc4f2402010-06-17 10:41:42 -04001484 scsi_autopm_get_target(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485
Arjan van de Ven0b950672006-01-11 13:16:10 +01001486 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001487 if (!shost->async_scan)
1488 scsi_complete_async_scans();
1489
Alan Sternbc4f2402010-06-17 10:41:42 -04001490 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001491 scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
Alan Sternbc4f2402010-06-17 10:41:42 -04001492 scsi_autopm_put_host(shost);
1493 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001494 mutex_unlock(&shost->scan_mutex);
Alan Sternbc4f2402010-06-17 10:41:42 -04001495 scsi_autopm_put_target(starget);
James Bottomleye63ed0d2014-01-21 07:00:50 -08001496 /*
1497 * paired with scsi_alloc_target(). Target will be destroyed unless
1498 * scsi_probe_and_add_lun made an underlying device visible
1499 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500 scsi_target_reap(starget);
1501 put_device(&starget->dev);
1502
1503 return sdev;
1504}
1505EXPORT_SYMBOL(__scsi_add_device);
1506
James Bottomley146f7262005-09-10 12:44:09 -05001507int scsi_add_device(struct Scsi_Host *host, uint channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001508 uint target, u64 lun)
James Bottomley146f7262005-09-10 12:44:09 -05001509{
1510 struct scsi_device *sdev =
1511 __scsi_add_device(host, channel, target, lun, NULL);
1512 if (IS_ERR(sdev))
1513 return PTR_ERR(sdev);
1514
1515 scsi_device_put(sdev);
1516 return 0;
1517}
1518EXPORT_SYMBOL(scsi_add_device);
1519
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520void scsi_rescan_device(struct device *dev)
1521{
Christoph Hellwige27829d2015-02-02 14:01:24 +01001522 device_lock(dev);
Hannes Reinecke09e2b0b2015-11-09 13:24:28 +01001523
1524 scsi_attach_vpd(to_scsi_device(dev));
1525
Christoph Hellwige27829d2015-02-02 14:01:24 +01001526 if (dev->driver && try_module_get(dev->driver->owner)) {
Christoph Hellwig3af6b352014-11-12 18:34:51 +01001527 struct scsi_driver *drv = to_scsi_driver(dev->driver);
1528
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529 if (drv->rescan)
1530 drv->rescan(dev);
Christoph Hellwig3af6b352014-11-12 18:34:51 +01001531 module_put(dev->driver->owner);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532 }
Christoph Hellwige27829d2015-02-02 14:01:24 +01001533 device_unlock(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534}
1535EXPORT_SYMBOL(scsi_rescan_device);
1536
Alan Sterne517d312005-07-26 10:18:45 -04001537static void __scsi_scan_target(struct device *parent, unsigned int channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001538 unsigned int id, u64 lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539{
1540 struct Scsi_Host *shost = dev_to_shost(parent);
1541 int bflags = 0;
1542 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543 struct scsi_target *starget;
1544
1545 if (shost->this_id == id)
1546 /*
1547 * Don't scan the host adapter
1548 */
1549 return;
1550
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552 if (!starget)
1553 return;
Alan Sternbc4f2402010-06-17 10:41:42 -04001554 scsi_autopm_get_target(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556 if (lun != SCAN_WILD_CARD) {
1557 /*
1558 * Scan for a specific host/chan/id/lun.
1559 */
1560 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1561 goto out_reap;
1562 }
1563
1564 /*
1565 * Scan LUN 0, if there is some response, scan further. Ideally, we
1566 * would not configure LUN 0 until all LUNs are scanned.
1567 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001568 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1569 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1570 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571 /*
1572 * The REPORT LUN did not scan the target,
1573 * do a sequential scan.
1574 */
1575 scsi_sequential_lun_scan(starget, bflags,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001576 starget->scsi_level, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578
1579 out_reap:
Alan Sternbc4f2402010-06-17 10:41:42 -04001580 scsi_autopm_put_target(starget);
James Bottomleye63ed0d2014-01-21 07:00:50 -08001581 /*
1582 * paired with scsi_alloc_target(): determine if the target has
1583 * any children at all and if not, nuke it
1584 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585 scsi_target_reap(starget);
1586
1587 put_device(&starget->dev);
1588}
Alan Sterne517d312005-07-26 10:18:45 -04001589
1590/**
Randy Dunlape59e4a02008-02-29 22:02:50 -08001591 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
Alan Sterne517d312005-07-26 10:18:45 -04001592 * @parent: host to scan
1593 * @channel: channel to scan
1594 * @id: target id to scan
1595 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1596 * @rescan: passed to LUN scanning routines
1597 *
1598 * Description:
1599 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1600 * and possibly all LUNs on the target id.
1601 *
1602 * First try a REPORT LUN scan, if that does not scan the target, do a
1603 * sequential scan of LUNs on the target id.
1604 **/
1605void scsi_scan_target(struct device *parent, unsigned int channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001606 unsigned int id, u64 lun, int rescan)
Alan Sterne517d312005-07-26 10:18:45 -04001607{
1608 struct Scsi_Host *shost = dev_to_shost(parent);
1609
Matthew Wilcox93b45af2006-11-22 13:24:53 -07001610 if (strncmp(scsi_scan_type, "none", 4) == 0)
1611 return;
1612
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001613 mutex_lock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001614 if (!shost->async_scan)
1615 scsi_complete_async_scans();
1616
Alan Sternbc4f2402010-06-17 10:41:42 -04001617 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Alan Sterne517d312005-07-26 10:18:45 -04001618 __scsi_scan_target(parent, channel, id, lun, rescan);
Alan Sternbc4f2402010-06-17 10:41:42 -04001619 scsi_autopm_put_host(shost);
1620 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001621 mutex_unlock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001622}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623EXPORT_SYMBOL(scsi_scan_target);
1624
1625static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001626 unsigned int id, u64 lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627{
1628 uint order_id;
1629
1630 if (id == SCAN_WILD_CARD)
1631 for (id = 0; id < shost->max_id; ++id) {
1632 /*
1633 * XXX adapter drivers when possible (FCP, iSCSI)
1634 * could modify max_id to match the current max,
1635 * not the absolute max.
1636 *
1637 * XXX add a shost id iterator, so for example,
1638 * the FC ID can be the same as a target id
1639 * without a huge overhead of sparse id's.
1640 */
1641 if (shost->reverse_ordering)
1642 /*
1643 * Scan from high to low id.
1644 */
1645 order_id = shost->max_id - id - 1;
1646 else
1647 order_id = id;
Alan Sterne517d312005-07-26 10:18:45 -04001648 __scsi_scan_target(&shost->shost_gendev, channel,
1649 order_id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650 }
1651 else
Alan Sterne517d312005-07-26 10:18:45 -04001652 __scsi_scan_target(&shost->shost_gendev, channel,
1653 id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001654}
1655
1656int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001657 unsigned int id, u64 lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658{
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001659 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001660 "%s: <%u:%u:%llu>\n",
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001661 __func__, channel, id, lun));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001662
1663 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
Amit Arora091686d2006-05-19 16:14:50 -07001664 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
Mark Knibbs605c6db2014-10-09 12:39:48 +01001665 ((lun != SCAN_WILD_CARD) && (lun >= shost->max_lun)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666 return -EINVAL;
1667
Arjan van de Ven0b950672006-01-11 13:16:10 +01001668 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001669 if (!shost->async_scan)
1670 scsi_complete_async_scans();
1671
Alan Sternbc4f2402010-06-17 10:41:42 -04001672 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Mike Anderson82f29462005-06-16 11:14:33 -07001673 if (channel == SCAN_WILD_CARD)
1674 for (channel = 0; channel <= shost->max_channel;
1675 channel++)
1676 scsi_scan_channel(shost, channel, id, lun,
1677 rescan);
1678 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679 scsi_scan_channel(shost, channel, id, lun, rescan);
Alan Sternbc4f2402010-06-17 10:41:42 -04001680 scsi_autopm_put_host(shost);
Mike Anderson82f29462005-06-16 11:14:33 -07001681 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001682 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683
1684 return 0;
1685}
1686
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001687static void scsi_sysfs_add_devices(struct Scsi_Host *shost)
1688{
1689 struct scsi_device *sdev;
1690 shost_for_each_device(sdev, shost) {
Dan Williams3b661a92012-06-21 23:47:28 -07001691 /* target removed before the device could be added */
1692 if (sdev->sdev_state == SDEV_DEL)
1693 continue;
Subhash Jadavani693ad5b2014-09-25 15:32:20 +03001694 /* If device is already visible, skip adding it to sysfs */
1695 if (sdev->is_visible)
1696 continue;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001697 if (!scsi_host_scan_allowed(shost) ||
1698 scsi_sysfs_add_sdev(sdev) != 0)
James Bottomley860dc732009-11-19 17:48:29 -05001699 __scsi_remove_device(sdev);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001700 }
1701}
1702
1703/**
1704 * scsi_prep_async_scan - prepare for an async scan
1705 * @shost: the host which will be scanned
1706 * Returns: a cookie to be passed to scsi_finish_async_scan()
1707 *
1708 * Tells the midlayer this host is going to do an asynchronous scan.
1709 * It reserves the host's position in the scanning list and ensures
1710 * that other asynchronous scans started after this one won't affect the
1711 * ordering of the discovered devices.
1712 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001713static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001714{
1715 struct async_scan_data *data;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001716 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001717
1718 if (strncmp(scsi_scan_type, "sync", 4) == 0)
1719 return NULL;
1720
1721 if (shost->async_scan) {
Vitaly Kuznetsova4cf30e2015-10-30 12:37:49 +01001722 shost_printk(KERN_DEBUG, shost, "%s called twice\n", __func__);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001723 return NULL;
1724 }
1725
1726 data = kmalloc(sizeof(*data), GFP_KERNEL);
1727 if (!data)
1728 goto err;
1729 data->shost = scsi_host_get(shost);
1730 if (!data->shost)
1731 goto err;
1732 init_completion(&data->prev_finished);
1733
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001734 mutex_lock(&shost->scan_mutex);
1735 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001736 shost->async_scan = 1;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001737 spin_unlock_irqrestore(shost->host_lock, flags);
1738 mutex_unlock(&shost->scan_mutex);
1739
1740 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001741 if (list_empty(&scanning_hosts))
1742 complete(&data->prev_finished);
1743 list_add_tail(&data->list, &scanning_hosts);
1744 spin_unlock(&async_scan_lock);
1745
1746 return data;
1747
1748 err:
1749 kfree(data);
1750 return NULL;
1751}
1752
1753/**
1754 * scsi_finish_async_scan - asynchronous scan has finished
1755 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1756 *
1757 * All the devices currently attached to this host have been found.
1758 * This function announces all the devices it has found to the rest
1759 * of the system.
1760 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001761static void scsi_finish_async_scan(struct async_scan_data *data)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001762{
1763 struct Scsi_Host *shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001764 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001765
1766 if (!data)
1767 return;
1768
1769 shost = data->shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001770
1771 mutex_lock(&shost->scan_mutex);
1772
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001773 if (!shost->async_scan) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001774 shost_printk(KERN_INFO, shost, "%s called twice\n", __func__);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001775 dump_stack();
Julia Lawall773e82f2008-07-21 09:58:30 +02001776 mutex_unlock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001777 return;
1778 }
1779
1780 wait_for_completion(&data->prev_finished);
1781
1782 scsi_sysfs_add_devices(shost);
1783
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001784 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001785 shost->async_scan = 0;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001786 spin_unlock_irqrestore(shost->host_lock, flags);
1787
1788 mutex_unlock(&shost->scan_mutex);
1789
1790 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001791 list_del(&data->list);
1792 if (!list_empty(&scanning_hosts)) {
1793 struct async_scan_data *next = list_entry(scanning_hosts.next,
1794 struct async_scan_data, list);
1795 complete(&next->prev_finished);
1796 }
1797 spin_unlock(&async_scan_lock);
1798
Huajun Li267a6ad2012-02-12 19:59:14 +08001799 scsi_autopm_put_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001800 scsi_host_put(shost);
1801 kfree(data);
1802}
1803
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001804static void do_scsi_scan_host(struct Scsi_Host *shost)
1805{
1806 if (shost->hostt->scan_finished) {
1807 unsigned long start = jiffies;
1808 if (shost->hostt->scan_start)
1809 shost->hostt->scan_start(shost);
1810
1811 while (!shost->hostt->scan_finished(shost, jiffies - start))
1812 msleep(10);
1813 } else {
1814 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1815 SCAN_WILD_CARD, 0);
1816 }
1817}
1818
Dan Williams6cdd5522012-07-09 19:33:35 -07001819static void do_scan_async(void *_data, async_cookie_t c)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001820{
1821 struct async_scan_data *data = _data;
Alan Sternbc4f2402010-06-17 10:41:42 -04001822 struct Scsi_Host *shost = data->shost;
1823
1824 do_scsi_scan_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001825 scsi_finish_async_scan(data);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001826}
1827
Linus Torvalds1da177e2005-04-16 15:20:36 -07001828/**
1829 * scsi_scan_host - scan the given adapter
1830 * @shost: adapter to scan
1831 **/
1832void scsi_scan_host(struct Scsi_Host *shost)
1833{
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001834 struct async_scan_data *data;
1835
1836 if (strncmp(scsi_scan_type, "none", 4) == 0)
1837 return;
Alan Sternbc4f2402010-06-17 10:41:42 -04001838 if (scsi_autopm_get_host(shost) < 0)
1839 return;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001840
1841 data = scsi_prep_async_scan(shost);
1842 if (!data) {
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001843 do_scsi_scan_host(shost);
Alan Sternbc4f2402010-06-17 10:41:42 -04001844 scsi_autopm_put_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001845 return;
1846 }
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001847
Dan Williams6cdd5522012-07-09 19:33:35 -07001848 /* register with the async subsystem so wait_for_device_probe()
1849 * will flush this work
1850 */
1851 async_schedule(do_scan_async, data);
1852
Huajun Li267a6ad2012-02-12 19:59:14 +08001853 /* scsi_autopm_put_host(shost) is called in scsi_finish_async_scan() */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001854}
1855EXPORT_SYMBOL(scsi_scan_host);
1856
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857void scsi_forget_host(struct Scsi_Host *shost)
1858{
Alan Sterna64358d2005-07-26 10:27:10 -04001859 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860 unsigned long flags;
1861
Alan Sterna64358d2005-07-26 10:27:10 -04001862 restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863 spin_lock_irqsave(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001864 list_for_each_entry(sdev, &shost->__devices, siblings) {
1865 if (sdev->sdev_state == SDEV_DEL)
1866 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001867 spin_unlock_irqrestore(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001868 __scsi_remove_device(sdev);
1869 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001870 }
1871 spin_unlock_irqrestore(shost->host_lock, flags);
1872}
1873
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001874/**
1875 * scsi_get_host_dev - Create a scsi_device that points to the host adapter itself
1876 * @shost: Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001877 *
1878 * Lock status: None assumed.
1879 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001880 * Returns: The scsi_device or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881 *
1882 * Notes:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001883 * Attach a single scsi_device to the Scsi_Host - this should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884 * be made to look like a "pseudo-device" that points to the
1885 * HA itself.
1886 *
1887 * Note - this device is not accessible from any high-level
1888 * drivers (including generics), which is probably not
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001889 * optimal. We can add hooks later to attach.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890 */
1891struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1892{
Alan Sterne517d312005-07-26 10:18:45 -04001893 struct scsi_device *sdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894 struct scsi_target *starget;
1895
Arjan van de Ven0b950672006-01-11 13:16:10 +01001896 mutex_lock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001897 if (!scsi_host_scan_allowed(shost))
1898 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001899 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1900 if (!starget)
Alan Sterne517d312005-07-26 10:18:45 -04001901 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902
1903 sdev = scsi_alloc_sdev(starget, 0, NULL);
Alan Sternd5469112010-02-12 12:13:39 -05001904 if (sdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905 sdev->borken = 0;
Alan Sternd5469112010-02-12 12:13:39 -05001906 else
James Bottomley884d25c2006-09-05 16:26:41 -05001907 scsi_target_reap(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001908 put_device(&starget->dev);
Alan Sterne517d312005-07-26 10:18:45 -04001909 out:
Arjan van de Ven0b950672006-01-11 13:16:10 +01001910 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911 return sdev;
1912}
1913EXPORT_SYMBOL(scsi_get_host_dev);
1914
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001915/**
1916 * scsi_free_host_dev - Free a scsi_device that points to the host adapter itself
1917 * @sdev: Host device to be freed
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918 *
1919 * Lock status: None assumed.
1920 *
1921 * Returns: Nothing
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922 */
1923void scsi_free_host_dev(struct scsi_device *sdev)
1924{
1925 BUG_ON(sdev->id != sdev->host->this_id);
1926
James Bottomley860dc732009-11-19 17:48:29 -05001927 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001928}
1929EXPORT_SYMBOL(scsi_free_host_dev);
1930