blob: 6efab1c455e158a71a2792c07d9b6d3fadc7595c [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)
58
59/*
Robert P. J. Day405ae7d2007-02-17 19:13:42 +010060 * Prefix values for the SCSI id's (stored in sysfs name field)
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 */
62#define SCSI_UID_SER_NUM 'S'
63#define SCSI_UID_UNKNOWN 'Z'
64
65/*
66 * Return values of some of the scanning functions.
67 *
68 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
69 * includes allocation or general failures preventing IO from being sent.
70 *
71 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
72 * on the given LUN.
73 *
74 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
75 * given LUN.
76 */
77#define SCSI_SCAN_NO_RESPONSE 0
78#define SCSI_SCAN_TARGET_PRESENT 1
79#define SCSI_SCAN_LUN_PRESENT 2
80
Arjan van de Ven0ad78202005-11-28 16:22:25 +010081static const char *scsi_null_device_strs = "nullnullnullnull";
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
83#define MAX_SCSI_LUNS 512
84
Hannes Reinecke1abf6352014-06-25 15:27:38 +020085static u64 max_scsi_luns = MAX_SCSI_LUNS;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
Hannes Reinecke1abf6352014-06-25 15:27:38 +020087module_param_named(max_luns, max_scsi_luns, ullong, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088MODULE_PARM_DESC(max_luns,
Hannes Reinecke1abf6352014-06-25 15:27:38 +020089 "last scsi LUN (should be between 1 and 2^64-1)");
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
Matthew Wilcox21db1882006-11-22 13:24:52 -070091#ifdef CONFIG_SCSI_SCAN_ASYNC
92#define SCSI_SCAN_TYPE_DEFAULT "async"
93#else
94#define SCSI_SCAN_TYPE_DEFAULT "sync"
95#endif
96
Dan Williams3c31b522014-04-10 15:30:35 -070097char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT;
Matthew Wilcox3e082a92006-09-28 15:19:20 -060098
99module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO);
100MODULE_PARM_DESC(scan, "sync, async or none");
101
Alan Stern14faf122009-03-12 11:08:51 -0400102static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ + 18;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
Masatake YAMATO10f4b892007-09-19 22:59:16 +0900104module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105MODULE_PARM_DESC(inq_timeout,
106 "Timeout (in seconds) waiting for devices to answer INQUIRY."
Alan Stern14faf122009-03-12 11:08:51 -0400107 " Default is 20. Some devices may need more; most need less.");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
Matthew Wilcox6b7f1232007-06-26 15:18:51 -0600109/* This lock protects only this list */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600110static DEFINE_SPINLOCK(async_scan_lock);
111static LIST_HEAD(scanning_hosts);
112
113struct async_scan_data {
114 struct list_head list;
115 struct Scsi_Host *shost;
116 struct completion prev_finished;
117};
118
119/**
120 * scsi_complete_async_scans - Wait for asynchronous scans to complete
121 *
Matthew Wilcox8bcc2412006-12-07 19:29:27 -0700122 * When this function returns, any host which started scanning before
123 * this function was called will have finished its scan. Hosts which
124 * started scanning after this function was called may or may not have
125 * finished.
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600126 */
127int scsi_complete_async_scans(void)
128{
129 struct async_scan_data *data;
130
131 do {
132 if (list_empty(&scanning_hosts))
Dan Williamse96eb232012-07-09 19:33:45 -0700133 return 0;
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600134 /* If we can't get memory immediately, that's OK. Just
135 * sleep a little. Even if we never get memory, the async
136 * scans will finish eventually.
137 */
138 data = kmalloc(sizeof(*data), GFP_KERNEL);
139 if (!data)
140 msleep(1);
141 } while (!data);
142
143 data->shost = NULL;
144 init_completion(&data->prev_finished);
145
146 spin_lock(&async_scan_lock);
147 /* Check that there's still somebody else on the list */
148 if (list_empty(&scanning_hosts))
149 goto done;
150 list_add_tail(&data->list, &scanning_hosts);
151 spin_unlock(&async_scan_lock);
152
153 printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n");
154 wait_for_completion(&data->prev_finished);
155
156 spin_lock(&async_scan_lock);
157 list_del(&data->list);
Matthew Wilcox8bcc2412006-12-07 19:29:27 -0700158 if (!list_empty(&scanning_hosts)) {
159 struct async_scan_data *next = list_entry(scanning_hosts.next,
160 struct async_scan_data, list);
161 complete(&next->prev_finished);
162 }
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600163 done:
164 spin_unlock(&async_scan_lock);
Dan Williamse96eb232012-07-09 19:33:45 -0700165
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600166 kfree(data);
167 return 0;
168}
169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170/**
171 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
James Bottomley39216032005-06-15 18:48:29 -0500172 * @sdev: scsi device to send command to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 * @result: area to store the result of the MODE SENSE
174 *
175 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500176 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 * Called for BLIST_KEY devices.
178 **/
James Bottomley39216032005-06-15 18:48:29 -0500179static void scsi_unlock_floptical(struct scsi_device *sdev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 unsigned char *result)
181{
182 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
183
Hannes Reinecke91921e02014-06-25 16:39:59 +0200184 sdev_printk(KERN_NOTICE, sdev, "unlocking floptical drive\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 scsi_cmd[0] = MODE_SENSE;
186 scsi_cmd[1] = 0;
187 scsi_cmd[2] = 0x2e;
188 scsi_cmd[3] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500189 scsi_cmd[4] = 0x2a; /* size */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 scsi_cmd[5] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500191 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900192 SCSI_TIMEOUT, 3, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193}
194
195/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 * scsi_alloc_sdev - allocate and setup a scsi_Device
Rob Landleyeb448202007-11-03 13:30:39 -0500197 * @starget: which target to allocate a &scsi_device for
198 * @lun: which lun
199 * @hostdata: usually NULL and set by ->slave_alloc instead
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 *
201 * Description:
202 * Allocate, initialize for io, and return a pointer to a scsi_Device.
203 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
204 * adds scsi_Device to the appropriate list.
205 *
206 * Return value:
207 * scsi_Device pointer, or NULL on failure.
208 **/
209static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +0200210 u64 lun, void *hostdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211{
212 struct scsi_device *sdev;
213 int display_failure_msg = 1, ret;
214 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
Jeff Garzika341cd02007-10-29 17:15:22 -0400215 extern void scsi_evt_thread(struct work_struct *work);
Jens Axboe9937a5e2011-05-17 11:04:44 +0200216 extern void scsi_requeue_run_queue(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Jes Sorensen24669f752006-01-16 10:31:18 -0500218 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 GFP_ATOMIC);
220 if (!sdev)
221 goto out;
222
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 sdev->vendor = scsi_null_device_strs;
224 sdev->model = scsi_null_device_strs;
225 sdev->rev = scsi_null_device_strs;
226 sdev->host = shost;
Vasu Dev4a840672009-10-22 15:46:33 -0700227 sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 sdev->id = starget->id;
229 sdev->lun = lun;
230 sdev->channel = starget->channel;
231 sdev->sdev_state = SDEV_CREATED;
232 INIT_LIST_HEAD(&sdev->siblings);
233 INIT_LIST_HEAD(&sdev->same_target_siblings);
234 INIT_LIST_HEAD(&sdev->cmd_list);
235 INIT_LIST_HEAD(&sdev->starved_entry);
Jeff Garzika341cd02007-10-29 17:15:22 -0400236 INIT_LIST_HEAD(&sdev->event_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 spin_lock_init(&sdev->list_lock);
Jeff Garzika341cd02007-10-29 17:15:22 -0400238 INIT_WORK(&sdev->event_work, scsi_evt_thread);
Jens Axboe9937a5e2011-05-17 11:04:44 +0200239 INIT_WORK(&sdev->requeue_work, scsi_requeue_run_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
241 sdev->sdev_gendev.parent = get_device(&starget->dev);
242 sdev->sdev_target = starget;
243
244 /* usually NULL and set by ->slave_alloc instead */
245 sdev->hostdata = hostdata;
246
247 /* if the device needs this changing, it may do so in the
248 * slave_configure function */
249 sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
250
251 /*
252 * Some low level driver could use device->type
253 */
254 sdev->type = -1;
255
256 /*
257 * Assume that the device will have handshaking problems,
258 * and then fix this field later if it turns out it
259 * doesn't
260 */
261 sdev->borken = 1;
262
Christoph Hellwigd2852032014-01-17 12:06:53 +0100263 if (shost_use_blk_mq(shost))
264 sdev->request_queue = scsi_mq_alloc_queue(sdev);
265 else
266 sdev->request_queue = scsi_alloc_queue(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 if (!sdev->request_queue) {
268 /* release fn is set up in scsi_sysfs_device_initialise, so
269 * have to free and put manually here */
270 put_device(&starget->dev);
Dave Jones93f560892006-03-09 10:21:27 -0500271 kfree(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 goto out;
273 }
Tejun Heo09ac46c2011-12-14 00:33:38 +0100274 WARN_ON_ONCE(!blk_get_queue(sdev->request_queue));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 sdev->request_queue->queuedata = sdev;
Christoph Hellwig2ecb2042014-11-03 14:09:02 +0100276
277 if (!shost_use_blk_mq(sdev->host) &&
278 (shost->bqt || shost->hostt->use_blk_tags)) {
279 blk_queue_init_tags(sdev->request_queue,
Shaohua Liee1b6f72015-01-15 17:32:25 -0800280 sdev->host->cmd_per_lun, shost->bqt,
281 shost->hostt->tag_alloc_policy);
Christoph Hellwig2ecb2042014-11-03 14:09:02 +0100282 }
Christoph Hellwigdb5ed4d2014-11-13 15:08:42 +0100283 scsi_change_queue_depth(sdev, sdev->host->cmd_per_lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
285 scsi_sysfs_device_initialize(sdev);
286
287 if (shost->hostt->slave_alloc) {
288 ret = shost->hostt->slave_alloc(sdev);
289 if (ret) {
290 /*
291 * if LLDD reports slave not present, don't clutter
292 * console with alloc failure messages
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 */
294 if (ret == -ENXIO)
295 display_failure_msg = 0;
296 goto out_device_destroy;
297 }
298 }
299
300 return sdev;
301
302out_device_destroy:
James Bottomley4e6c82b2011-11-07 08:51:24 -0600303 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304out:
305 if (display_failure_msg)
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700306 printk(ALLOC_FAILURE_MSG, __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 return NULL;
308}
309
James Bottomley643eb2d2008-03-22 22:42:27 -0500310static void scsi_target_destroy(struct scsi_target *starget)
311{
312 struct device *dev = &starget->dev;
313 struct Scsi_Host *shost = dev_to_shost(dev->parent);
314 unsigned long flags;
315
James Bottomleyf2495e22014-01-21 07:01:41 -0800316 starget->state = STARGET_DEL;
James Bottomley643eb2d2008-03-22 22:42:27 -0500317 transport_destroy_device(dev);
318 spin_lock_irqsave(shost->host_lock, flags);
319 if (shost->hostt->target_destroy)
320 shost->hostt->target_destroy(starget);
321 list_del_init(&starget->siblings);
322 spin_unlock_irqrestore(shost->host_lock, flags);
323 put_device(dev);
324}
325
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326static void scsi_target_dev_release(struct device *dev)
327{
328 struct device *parent = dev->parent;
329 struct scsi_target *starget = to_scsi_target(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500330
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 kfree(starget);
332 put_device(parent);
333}
334
Adrian Bunk453cd0f2008-07-03 23:47:33 -0700335static struct device_type scsi_target_type = {
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100336 .name = "scsi_target",
337 .release = scsi_target_dev_release,
338};
339
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340int scsi_is_target_device(const struct device *dev)
341{
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100342 return dev->type == &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343}
344EXPORT_SYMBOL(scsi_is_target_device);
345
346static struct scsi_target *__scsi_find_target(struct device *parent,
347 int channel, uint id)
348{
349 struct scsi_target *starget, *found_starget = NULL;
350 struct Scsi_Host *shost = dev_to_shost(parent);
351 /*
352 * Search for an existing target for this sdev.
353 */
354 list_for_each_entry(starget, &shost->__targets, siblings) {
355 if (starget->id == id &&
356 starget->channel == channel) {
357 found_starget = starget;
358 break;
359 }
360 }
361 if (found_starget)
362 get_device(&found_starget->dev);
363
364 return found_starget;
365}
366
James Bottomley884d25c2006-09-05 16:26:41 -0500367/**
James Bottomleye63ed0d2014-01-21 07:00:50 -0800368 * scsi_target_reap_ref_release - remove target from visibility
369 * @kref: the reap_ref in the target being released
370 *
371 * Called on last put of reap_ref, which is the indication that no device
372 * under this target is visible anymore, so render the target invisible in
373 * sysfs. Note: we have to be in user context here because the target reaps
374 * should be done in places where the scsi device visibility is being removed.
375 */
376static void scsi_target_reap_ref_release(struct kref *kref)
377{
378 struct scsi_target *starget
379 = container_of(kref, struct scsi_target, reap_ref);
380
James Bottomleyf2495e22014-01-21 07:01:41 -0800381 /*
382 * if we get here and the target is still in the CREATED state that
383 * means it was allocated but never made visible (because a scan
384 * turned up no LUNs), so don't call device_del() on it.
385 */
386 if (starget->state != STARGET_CREATED) {
387 transport_remove_device(&starget->dev);
388 device_del(&starget->dev);
389 }
James Bottomleye63ed0d2014-01-21 07:00:50 -0800390 scsi_target_destroy(starget);
391}
392
393static void scsi_target_reap_ref_put(struct scsi_target *starget)
394{
395 kref_put(&starget->reap_ref, scsi_target_reap_ref_release);
396}
397
398/**
James Bottomley884d25c2006-09-05 16:26:41 -0500399 * scsi_alloc_target - allocate a new or find an existing target
400 * @parent: parent of the target (need not be a scsi host)
401 * @channel: target channel number (zero if no channels)
402 * @id: target id number
403 *
404 * Return an existing target if one exists, provided it hasn't already
405 * gone into STARGET_DEL state, otherwise allocate a new target.
406 *
407 * The target is returned with an incremented reference, so the caller
408 * is responsible for both reaping and doing a last put
409 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410static struct scsi_target *scsi_alloc_target(struct device *parent,
411 int channel, uint id)
412{
413 struct Scsi_Host *shost = dev_to_shost(parent);
414 struct device *dev = NULL;
415 unsigned long flags;
416 const int size = sizeof(struct scsi_target)
417 + shost->transportt->target_size;
James.Smart@Emulex.Com5c44cd22005-06-10 22:24:30 -0400418 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 struct scsi_target *found_target;
James Bottomleye63ed0d2014-01-21 07:00:50 -0800420 int error, ref_got;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
Jes Sorensen24669f752006-01-16 10:31:18 -0500422 starget = kzalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 if (!starget) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700424 printk(KERN_ERR "%s: allocation failure\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 return NULL;
426 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 dev = &starget->dev;
428 device_initialize(dev);
James Bottomleye63ed0d2014-01-21 07:00:50 -0800429 kref_init(&starget->reap_ref);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 dev->parent = get_device(parent);
Kay Sievers71610f52008-12-03 22:41:36 +0100431 dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id);
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100432 dev->bus = &scsi_bus_type;
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100433 dev->type = &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 starget->id = id;
435 starget->channel = channel;
Mike Christief0c0a372008-08-17 15:24:38 -0500436 starget->can_queue = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 INIT_LIST_HEAD(&starget->siblings);
438 INIT_LIST_HEAD(&starget->devices);
James Bottomley643eb2d2008-03-22 22:42:27 -0500439 starget->state = STARGET_CREATED;
Alan Stern7c9d6f12007-01-08 11:12:32 -0500440 starget->scsi_level = SCSI_2;
Edward Gogginc53a2842009-04-09 10:02:22 -0700441 starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED;
James Bottomleyffedb452006-02-23 14:27:18 -0600442 retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 spin_lock_irqsave(shost->host_lock, flags);
444
445 found_target = __scsi_find_target(parent, channel, id);
446 if (found_target)
447 goto found;
448
449 list_add_tail(&starget->siblings, &shost->__targets);
450 spin_unlock_irqrestore(shost->host_lock, flags);
451 /* allocate and add */
James Bottomleya283bd32005-05-24 12:06:38 -0500452 transport_setup_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500453 if (shost->hostt->target_alloc) {
Brian King32f95792006-02-22 14:28:24 -0600454 error = shost->hostt->target_alloc(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500455
456 if(error) {
457 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
458 /* don't want scsi_target_reap to do the final
459 * put because it will be under the host lock */
James Bottomley643eb2d2008-03-22 22:42:27 -0500460 scsi_target_destroy(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500461 return NULL;
462 }
463 }
James Bottomley884d25c2006-09-05 16:26:41 -0500464 get_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500465
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 return starget;
467
468 found:
James Bottomleye63ed0d2014-01-21 07:00:50 -0800469 /*
470 * release routine already fired if kref is zero, so if we can still
471 * take the reference, the target must be alive. If we can't, it must
472 * be dying and we need to wait for a new target
473 */
474 ref_got = kref_get_unless_zero(&found_target->reap_ref);
475
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 spin_unlock_irqrestore(shost->host_lock, flags);
James Bottomleye63ed0d2014-01-21 07:00:50 -0800477 if (ref_got) {
Alan Stern12fb8c12010-03-18 15:41:22 -0400478 put_device(dev);
James Bottomleyffedb452006-02-23 14:27:18 -0600479 return found_target;
480 }
James Bottomleye63ed0d2014-01-21 07:00:50 -0800481 /*
482 * Unfortunately, we found a dying target; need to wait until it's
483 * dead before we can get a new one. There is an anomaly here. We
484 * *should* call scsi_target_reap() to balance the kref_get() of the
485 * reap_ref above. However, since the target being released, it's
486 * already invisible and the reap_ref is irrelevant. If we call
487 * scsi_target_reap() we might spuriously do another device_del() on
488 * an already invisible target.
489 */
James Bottomleyffedb452006-02-23 14:27:18 -0600490 put_device(&found_target->dev);
James Bottomleye63ed0d2014-01-21 07:00:50 -0800491 /*
492 * length of time is irrelevant here, we just want to yield the CPU
493 * for a tick to avoid busy waiting for the target to die.
494 */
495 msleep(1);
James Bottomleyffedb452006-02-23 14:27:18 -0600496 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497}
498
499/**
500 * scsi_target_reap - check to see if target is in use and destroy if not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 * @starget: target to be checked
502 *
503 * This is used after removing a LUN or doing a last put of the target
504 * it checks atomically that nothing is using the target and removes
505 * it if so.
506 */
507void scsi_target_reap(struct scsi_target *starget)
508{
James Bottomleyf2495e22014-01-21 07:01:41 -0800509 /*
510 * serious problem if this triggers: STARGET_DEL is only set in the if
511 * the reap_ref drops to zero, so we're trying to do another final put
512 * on an already released kref
513 */
James Bottomleye63ed0d2014-01-21 07:00:50 -0800514 BUG_ON(starget->state == STARGET_DEL);
James Bottomleyf2495e22014-01-21 07:01:41 -0800515 scsi_target_reap_ref_put(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516}
517
518/**
Alan Sterne5b3cd42006-08-21 15:53:25 -0400519 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
520 * @s: INQUIRY result string to sanitize
521 * @len: length of the string
522 *
523 * Description:
524 * The SCSI spec says that INQUIRY vendor, product, and revision
525 * strings must consist entirely of graphic ASCII characters,
526 * padded on the right with spaces. Since not all devices obey
527 * this rule, we will replace non-graphic or non-ASCII characters
528 * with spaces. Exception: a NUL character is interpreted as a
529 * string terminator, so all the following characters are set to
530 * spaces.
531 **/
532static void sanitize_inquiry_string(unsigned char *s, int len)
533{
534 int terminated = 0;
535
536 for (; len > 0; (--len, ++s)) {
537 if (*s == 0)
538 terminated = 1;
539 if (terminated || *s < 0x20 || *s > 0x7e)
540 *s = ' ';
541 }
542}
543
544/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
James Bottomley39216032005-06-15 18:48:29 -0500546 * @sdev: scsi_device to probe
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 * @inq_result: area to store the INQUIRY result
James Bottomley39216032005-06-15 18:48:29 -0500548 * @result_len: len of inq_result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 * @bflags: store any bflags found here
550 *
551 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500552 * Probe the lun associated with @req using a standard SCSI INQUIRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 *
James Bottomley39216032005-06-15 18:48:29 -0500554 * If the INQUIRY is successful, zero is returned and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100556 * are copied to the scsi_device any flags value is stored in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400558static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
James Bottomley39216032005-06-15 18:48:29 -0500559 int result_len, int *bflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
562 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
563 int response_len = 0;
James Bottomley39216032005-06-15 18:48:29 -0500564 int pass, count, result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 struct scsi_sense_hdr sshdr;
566
567 *bflags = 0;
568
569 /* Perform up to 3 passes. The first pass uses a conservative
570 * transfer length of 36 unless sdev->inquiry_len specifies a
571 * different value. */
572 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
573 try_inquiry_len = first_inquiry_len;
574 pass = 1;
575
576 next_pass:
James Bottomley9ccfc752005-10-02 11:45:08 -0500577 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
578 "scsi scan: INQUIRY pass %d length %d\n",
579 pass, try_inquiry_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
581 /* Each pass gets up to three chances to ignore Unit Attention */
582 for (count = 0; count < 3; ++count) {
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900583 int resid;
584
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 memset(scsi_cmd, 0, 6);
586 scsi_cmd[0] = INQUIRY;
587 scsi_cmd[4] = (unsigned char) try_inquiry_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588
589 memset(inq_result, 0, try_inquiry_len);
James Bottomley39216032005-06-15 18:48:29 -0500590
591 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -0500592 inq_result, try_inquiry_len, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900593 HZ / 2 + HZ * scsi_inq_timeout, 3,
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900594 &resid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595
Hannes Reinecke91921e02014-06-25 16:39:59 +0200596 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
597 "scsi scan: INQUIRY %s with code 0x%x\n",
James Bottomley39216032005-06-15 18:48:29 -0500598 result ? "failed" : "successful", result));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
James Bottomley39216032005-06-15 18:48:29 -0500600 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 /*
602 * not-ready to ready transition [asc/ascq=0x28/0x0]
603 * or power-on, reset [asc/ascq=0x29/0x0], continue.
604 * INQUIRY should not yield UNIT_ATTENTION
605 * but many buggy devices do so anyway.
606 */
James Bottomley39216032005-06-15 18:48:29 -0500607 if ((driver_byte(result) & DRIVER_SENSE) &&
James Bottomleyea73a9f2005-08-28 11:33:52 -0500608 scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 if ((sshdr.sense_key == UNIT_ATTENTION) &&
610 ((sshdr.asc == 0x28) ||
611 (sshdr.asc == 0x29)) &&
612 (sshdr.ascq == 0))
613 continue;
614 }
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900615 } else {
616 /*
617 * if nothing was transferred, we try
618 * again. It's a workaround for some USB
619 * devices.
620 */
621 if (resid == try_inquiry_len)
622 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 }
624 break;
625 }
626
James Bottomley39216032005-06-15 18:48:29 -0500627 if (result == 0) {
Alan Sterne5b3cd42006-08-21 15:53:25 -0400628 sanitize_inquiry_string(&inq_result[8], 8);
629 sanitize_inquiry_string(&inq_result[16], 16);
630 sanitize_inquiry_string(&inq_result[32], 4);
631
632 response_len = inq_result[4] + 5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 if (response_len > 255)
634 response_len = first_inquiry_len; /* sanity */
635
636 /*
637 * Get any flags for this device.
638 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100639 * XXX add a bflags to scsi_device, and replace the
640 * corresponding bit fields in scsi_device, so bflags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 * need not be passed as an argument.
642 */
643 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
644 &inq_result[16]);
645
646 /* When the first pass succeeds we gain information about
647 * what larger transfer lengths might work. */
648 if (pass == 1) {
649 if (BLIST_INQUIRY_36 & *bflags)
650 next_inquiry_len = 36;
651 else if (BLIST_INQUIRY_58 & *bflags)
652 next_inquiry_len = 58;
653 else if (sdev->inquiry_len)
654 next_inquiry_len = sdev->inquiry_len;
655 else
656 next_inquiry_len = response_len;
657
658 /* If more data is available perform the second pass */
659 if (next_inquiry_len > try_inquiry_len) {
660 try_inquiry_len = next_inquiry_len;
661 pass = 2;
662 goto next_pass;
663 }
664 }
665
666 } else if (pass == 2) {
Hannes Reinecke91921e02014-06-25 16:39:59 +0200667 sdev_printk(KERN_INFO, sdev,
668 "scsi scan: %d byte inquiry failed. "
669 "Consider BLIST_INQUIRY_36 for this device\n",
670 try_inquiry_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671
672 /* If this pass failed, the third pass goes back and transfers
673 * the same amount as we successfully got in the first pass. */
674 try_inquiry_len = first_inquiry_len;
675 pass = 3;
676 goto next_pass;
677 }
678
679 /* If the last transfer attempt got an error, assume the
680 * peripheral doesn't exist or is dead. */
James Bottomley39216032005-06-15 18:48:29 -0500681 if (result)
682 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683
684 /* Don't report any more data than the device says is valid */
685 sdev->inquiry_len = min(try_inquiry_len, response_len);
686
687 /*
688 * XXX Abort if the response length is less than 36? If less than
689 * 32, the lookup of the device flags (above) could be invalid,
690 * and it would be possible to take an incorrect action - we do
691 * not want to hang because of a short INQUIRY. On the flip side,
692 * if the device is spun down or becoming ready (and so it gives a
693 * short INQUIRY), an abort here prevents any further use of the
694 * device, including spin up.
695 *
Alan Sterne423ee32007-02-16 01:46:38 -0800696 * On the whole, the best approach seems to be to assume the first
697 * 36 bytes are valid no matter what the device says. That's
698 * better than copying < 36 bytes to the inquiry-result buffer
699 * and displaying garbage for the Vendor, Product, or Revision
700 * strings.
701 */
702 if (sdev->inquiry_len < 36) {
Hannes Reinecke91921e02014-06-25 16:39:59 +0200703 sdev_printk(KERN_INFO, sdev,
704 "scsi scan: INQUIRY result too short (%d),"
705 " using 36\n", sdev->inquiry_len);
Alan Sterne423ee32007-02-16 01:46:38 -0800706 sdev->inquiry_len = 36;
707 }
708
709 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 * Related to the above issue:
711 *
712 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
713 * and if not ready, sent a START_STOP to start (maybe spin up) and
714 * then send the INQUIRY again, since the INQUIRY can change after
715 * a device is initialized.
716 *
717 * Ideally, start a device if explicitly asked to do so. This
718 * assumes that a device is spun up on power on, spun down on
719 * request, and then spun up on request.
720 */
721
722 /*
723 * The scanning code needs to know the scsi_level, even if no
724 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
725 * non-zero LUNs can be scanned.
726 */
727 sdev->scsi_level = inq_result[2] & 0x07;
728 if (sdev->scsi_level >= 2 ||
729 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
730 sdev->scsi_level++;
James Bottomley6f3a2022005-09-22 20:33:28 -0500731 sdev->sdev_target->scsi_level = sdev->scsi_level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732
Alan Stern50c4e962014-09-02 11:35:50 -0400733 /*
734 * If SCSI-2 or lower, and if the transport requires it,
735 * store the LUN value in CDB[1].
736 */
737 sdev->lun_in_cdb = 0;
738 if (sdev->scsi_level <= SCSI_2 &&
739 sdev->scsi_level != SCSI_UNKNOWN &&
740 !sdev->host->no_scsi2_lun_in_cdb)
741 sdev->lun_in_cdb = 1;
742
James Bottomley39216032005-06-15 18:48:29 -0500743 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744}
745
746/**
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100747 * scsi_add_lun - allocate and fully initialze a scsi_device
Matthew Wilcox6d877682007-07-11 12:54:55 -0600748 * @sdev: holds information to be stored in the new scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 * @inq_result: holds the result of a previous INQUIRY to the LUN
750 * @bflags: black/white list flag
Matthew Wilcox6d877682007-07-11 12:54:55 -0600751 * @async: 1 if this device is being scanned asynchronously
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 *
753 * Description:
Matthew Wilcox6d877682007-07-11 12:54:55 -0600754 * Initialize the scsi_device @sdev. Optionally set fields based
755 * on values in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 *
757 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100758 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
759 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400761static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600762 int *bflags, int async)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763{
James Bottomley6f4267e2008-08-22 16:53:31 -0500764 int ret;
765
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 /*
767 * XXX do not save the inquiry, since it can change underneath us,
768 * save just vendor/model/rev.
769 *
770 * Rather than save it and have an ioctl that retrieves the saved
771 * value, have an ioctl that executes the same INQUIRY code used
772 * in scsi_probe_lun, let user level programs doing INQUIRY
773 * scanning run at their own risk, or supply a user level program
774 * that can correctly scan.
775 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776
Alan Stern09123d22006-11-10 12:27:57 -0800777 /*
778 * Copy at least 36 bytes of INQUIRY data, so that we don't
779 * dereference unallocated memory when accessing the Vendor,
780 * Product, and Revision strings. Badly behaved devices may set
781 * the INQUIRY Additional Length byte to a small value, indicating
782 * these strings are invalid, but often they contain plausible data
783 * nonetheless. It doesn't matter if the device sent < 36 bytes
784 * total, since scsi_probe_lun() initializes inq_result with 0s.
785 */
786 sdev->inquiry = kmemdup(inq_result,
787 max_t(size_t, sdev->inquiry_len, 36),
788 GFP_ATOMIC);
789 if (sdev->inquiry == NULL)
790 return SCSI_SCAN_NO_RESPONSE;
791
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 sdev->vendor = (char *) (sdev->inquiry + 8);
793 sdev->model = (char *) (sdev->inquiry + 16);
794 sdev->rev = (char *) (sdev->inquiry + 32);
795
James Bottomley14216562012-07-25 23:55:55 +0400796 if (strncmp(sdev->vendor, "ATA ", 8) == 0) {
797 /*
798 * sata emulation layer device. This is a hack to work around
799 * the SATL power management specifications which state that
800 * when the SATL detects the device has gone into standby
801 * mode, it shall respond with NOT READY.
802 */
803 sdev->allow_restart = 1;
804 }
805
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 if (*bflags & BLIST_ISROM) {
Matthew Wilcox6d877682007-07-11 12:54:55 -0600807 sdev->type = TYPE_ROM;
808 sdev->removable = 1;
809 } else {
810 sdev->type = (inq_result[0] & 0x1f);
811 sdev->removable = (inq_result[1] & 0x80) >> 7;
Subhash Jadavani45341ca2014-09-25 15:32:19 +0300812
813 /*
814 * some devices may respond with wrong type for
815 * well-known logical units. Force well-known type
816 * to enumerate them correctly.
817 */
818 if (scsi_is_wlun(sdev->lun) && sdev->type != TYPE_WLUN) {
819 sdev_printk(KERN_WARNING, sdev,
820 "%s: correcting incorrect peripheral device type 0x%x for W-LUN 0x%16xhN\n",
821 __func__, sdev->type, (unsigned int)sdev->lun);
822 sdev->type = TYPE_WLUN;
823 }
824
Matthew Wilcox6d877682007-07-11 12:54:55 -0600825 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826
Matthew Wilcox6d877682007-07-11 12:54:55 -0600827 if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {
828 /* RBC and MMC devices can return SCSI-3 compliance and yet
829 * still not support REPORT LUNS, so make them act as
830 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
831 * specifically set */
832 if ((*bflags & BLIST_REPORTLUN2) == 0)
833 *bflags |= BLIST_NOREPORTLUN;
834 }
835
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 /*
837 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
838 * spec says: The device server is capable of supporting the
839 * specified peripheral device type on this logical unit. However,
840 * the physical device is not currently connected to this logical
841 * unit.
842 *
843 * The above is vague, as it implies that we could treat 001 and
844 * 011 the same. Stay compatible with previous code, and create a
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100845 * scsi_device for a PQ of 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 *
847 * Don't set the device offline here; rather let the upper
848 * level drivers eval the PQ to decide whether they should
849 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
850 */
851
852 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 sdev->lockable = sdev->removable;
854 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
855
Matthew Wilcox6d877682007-07-11 12:54:55 -0600856 if (sdev->scsi_level >= SCSI_3 ||
857 (sdev->inquiry_len > 56 && inq_result[56] & 0x04))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 sdev->ppr = 1;
859 if (inq_result[7] & 0x60)
860 sdev->wdtr = 1;
861 if (inq_result[7] & 0x10)
862 sdev->sdtr = 1;
863
James Bottomley19ac0db2006-08-06 18:15:22 -0500864 sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d "
Matthew Wilcox4ff36712006-07-04 12:15:20 -0600865 "ANSI: %d%s\n", scsi_device_type(sdev->type),
866 sdev->vendor, sdev->model, sdev->rev,
867 sdev->inq_periph_qual, inq_result[2] & 0x07,
868 (inq_result[3] & 0x0f) == 1 ? " CCS" : "");
869
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
Christoph Hellwigc8b09f62014-11-03 20:15:14 +0100871 !(*bflags & BLIST_NOTQ)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 sdev->tagged_supported = 1;
Christoph Hellwigc8b09f62014-11-03 20:15:14 +0100873 sdev->simple_tags = 1;
874 }
Matthew Wilcox6d877682007-07-11 12:54:55 -0600875
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 /*
877 * Some devices (Texel CD ROM drives) have handshaking problems
878 * when used with the Seagate controllers. borken is initialized
879 * to 1, and then set it to 0 here.
880 */
881 if ((*bflags & BLIST_BORKEN) == 0)
882 sdev->borken = 0;
883
Matthew Wilcox6d877682007-07-11 12:54:55 -0600884 if (*bflags & BLIST_NO_ULD_ATTACH)
885 sdev->no_uld_attach = 1;
886
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 /*
888 * Apparently some really broken devices (contrary to the SCSI
889 * standards) need to be selected without asserting ATN
890 */
891 if (*bflags & BLIST_SELECT_NO_ATN)
892 sdev->select_no_atn = 1;
893
894 /*
James Bottomley4d7db042006-03-31 20:07:45 -0600895 * Maximum 512 sector transfer length
896 * broken RA4x00 Compaq Disk Array
897 */
898 if (*bflags & BLIST_MAX_512)
Martin K. Petersen086fa5f2010-02-26 00:20:38 -0500899 blk_queue_max_hw_sectors(sdev->request_queue, 512);
Mike Christie35e9a9f2015-04-20 22:42:24 -0500900 /*
901 * Max 1024 sector transfer length for targets that report incorrect
902 * max/optimal lengths and relied on the old block layer safe default
903 */
904 else if (*bflags & BLIST_MAX_1024)
905 blk_queue_max_hw_sectors(sdev->request_queue, 1024);
James Bottomley4d7db042006-03-31 20:07:45 -0600906
907 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 * Some devices may not want to have a start command automatically
909 * issued when a device is added.
910 */
911 if (*bflags & BLIST_NOSTARTONADD)
912 sdev->no_start_on_add = 1;
913
914 if (*bflags & BLIST_SINGLELUN)
Tony Battersby25d7c362007-11-12 10:00:44 -0500915 scsi_target(sdev)->single_lun = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 sdev->use_10_for_rw = 1;
918
919 if (*bflags & BLIST_MS_SKIP_PAGE_08)
920 sdev->skip_ms_page_8 = 1;
921
922 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
923 sdev->skip_ms_page_3f = 1;
924
925 if (*bflags & BLIST_USE_10_BYTE_MS)
926 sdev->use_10_for_ms = 1;
927
Janusz Dziemidowicz02134362014-07-24 15:48:46 +0200928 /* some devices don't like REPORT SUPPORTED OPERATION CODES
929 * and will simply timeout causing sd_mod init to take a very
930 * very long time */
931 if (*bflags & BLIST_NO_RSOC)
932 sdev->no_report_opcodes = 1;
933
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 /* set the device running here so that slave configure
935 * may do I/O */
James Bottomley6f4267e2008-08-22 16:53:31 -0500936 ret = scsi_device_set_state(sdev, SDEV_RUNNING);
937 if (ret) {
938 ret = scsi_device_set_state(sdev, SDEV_BLOCK);
939
940 if (ret) {
941 sdev_printk(KERN_ERR, sdev,
942 "in wrong state %s to complete scan\n",
943 scsi_device_state_name(sdev->sdev_state));
944 return SCSI_SCAN_NO_RESPONSE;
945 }
946 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947
948 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
949 sdev->use_192_bytes_for_3f = 1;
950
951 if (*bflags & BLIST_NOT_LOCKABLE)
952 sdev->lockable = 0;
953
954 if (*bflags & BLIST_RETRY_HWERROR)
955 sdev->retry_hwerror = 1;
956
Martin K. Petersend974e422012-08-28 14:29:35 -0400957 if (*bflags & BLIST_NO_DIF)
958 sdev->no_dif = 1;
959
Martin K. Petersen0816c922013-05-10 10:36:04 -0400960 sdev->eh_timeout = SCSI_DEFAULT_EH_TIMEOUT;
961
Martin K. Petersenc1d40a52014-07-15 12:49:17 -0400962 if (*bflags & BLIST_TRY_VPD_PAGES)
963 sdev->try_vpd_pages = 1;
964 else if (*bflags & BLIST_SKIP_VPD_PAGES)
Martin K. Petersen56f2a802013-04-24 21:19:47 -0400965 sdev->skip_vpd_pages = 1;
966
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 transport_configure_device(&sdev->sdev_gendev);
968
Christoph Hellwig93805092006-02-17 12:11:29 +0100969 if (sdev->host->hostt->slave_configure) {
James Bottomley6f4267e2008-08-22 16:53:31 -0500970 ret = sdev->host->hostt->slave_configure(sdev);
Christoph Hellwig93805092006-02-17 12:11:29 +0100971 if (ret) {
972 /*
973 * if LLDD reports slave not present, don't clutter
974 * console with alloc failure messages
975 */
976 if (ret != -ENXIO) {
977 sdev_printk(KERN_ERR, sdev,
978 "failed to configure device\n");
979 }
980 return SCSI_SCAN_NO_RESPONSE;
981 }
982 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983
Hannes Reineckeb3ae8782014-03-15 09:51:49 +0100984 if (sdev->scsi_level >= SCSI_3)
985 scsi_attach_vpd(sdev);
986
Vasu Dev4a840672009-10-22 15:46:33 -0700987 sdev->max_queue_depth = sdev->queue_depth;
988
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 /*
990 * Ok, the device is now all set up, we can
991 * register it and tell the rest of the kernel
992 * about it.
993 */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600994 if (!async && scsi_sysfs_add_sdev(sdev) != 0)
Alan Sternb24b1032005-07-27 11:43:46 -0700995 return SCSI_SCAN_NO_RESPONSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996
997 return SCSI_SCAN_LUN_PRESENT;
998}
999
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001000#ifdef CONFIG_SCSI_LOGGING
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001001/**
Rob Landleyeb448202007-11-03 13:30:39 -05001002 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001003 * @buf: Output buffer with at least end-first+1 bytes of space
1004 * @inq: Inquiry buffer (input)
1005 * @first: Offset of string into inq
1006 * @end: Index after last character in inq
1007 */
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001008static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001009 unsigned first, unsigned end)
1010{
1011 unsigned term = 0, idx;
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001012
1013 for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
1014 if (inq[idx+first] > ' ') {
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001015 buf[idx] = inq[idx+first];
1016 term = idx+1;
1017 } else {
1018 buf[idx] = ' ';
1019 }
1020 }
1021 buf[term] = 0;
1022 return buf;
1023}
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001024#endif
James Bottomley6f3a2022005-09-22 20:33:28 -05001025
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026/**
1027 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
1028 * @starget: pointer to target device structure
1029 * @lun: LUN of target device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 * @bflagsp: store bflags here if not NULL
Rob Landleyeb448202007-11-03 13:30:39 -05001031 * @sdevp: probe the LUN corresponding to this scsi_device
1032 * @rescan: if nonzero skip some code only needed on first scan
1033 * @hostdata: passed to scsi_alloc_sdev()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 *
1035 * Description:
1036 * Call scsi_probe_lun, if a LUN with an attached device is found,
1037 * allocate and set it up by calling scsi_add_lun.
1038 *
1039 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001040 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
1042 * attached at the LUN
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001043 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 **/
1045static int scsi_probe_and_add_lun(struct scsi_target *starget,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001046 u64 lun, int *bflagsp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 struct scsi_device **sdevp, int rescan,
1048 void *hostdata)
1049{
1050 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 unsigned char *result;
James Bottomley39216032005-06-15 18:48:29 -05001052 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1054
1055 /*
1056 * The rescan flag is used as an optimization, the first scan of a
1057 * host adapter calls into here with rescan == 0.
1058 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001059 sdev = scsi_device_lookup_by_target(starget, lun);
1060 if (sdev) {
James Bottomley0f1d87a2008-08-22 16:43:59 -05001061 if (rescan || !scsi_device_created(sdev)) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001062 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 "scsi scan: device exists on %s\n",
Kay Sievers71610f52008-12-03 22:41:36 +01001064 dev_name(&sdev->sdev_gendev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 if (sdevp)
1066 *sdevp = sdev;
1067 else
1068 scsi_device_put(sdev);
1069
1070 if (bflagsp)
1071 *bflagsp = scsi_get_device_flags(sdev,
1072 sdev->vendor,
1073 sdev->model);
1074 return SCSI_SCAN_LUN_PRESENT;
1075 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001076 scsi_device_put(sdev);
1077 } else
1078 sdev = scsi_alloc_sdev(starget, lun, hostdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 if (!sdev)
1080 goto out;
James Bottomley39216032005-06-15 18:48:29 -05001081
1082 result = kmalloc(result_len, GFP_ATOMIC |
Al Virobc861202005-04-24 12:28:34 -07001083 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 if (!result)
James Bottomley39216032005-06-15 18:48:29 -05001085 goto out_free_sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086
James Bottomley39216032005-06-15 18:48:29 -05001087 if (scsi_probe_lun(sdev, result, result_len, &bflags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 goto out_free_result;
1089
Kurt Garloff4186ab12006-04-03 15:16:48 +02001090 if (bflagsp)
1091 *bflagsp = bflags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 /*
1093 * result contains valid SCSI INQUIRY data.
1094 */
Kurt Garloff13f7e5a2006-04-03 15:20:08 +02001095 if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 /*
1097 * For a Peripheral qualifier 3 (011b), the SCSI
1098 * spec says: The device server is not capable of
1099 * supporting a physical device on this logical
1100 * unit.
1101 *
1102 * For disks, this implies that there is no
1103 * logical disk configured at sdev->lun, but there
1104 * is a target id responding.
1105 */
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001106 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
1107 " peripheral qualifier of 3, device not"
1108 " added\n"))
1109 if (lun == 0) {
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001110 SCSI_LOG_SCAN_BUS(1, {
1111 unsigned char vend[9];
1112 unsigned char mod[17];
1113
1114 sdev_printk(KERN_INFO, sdev,
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001115 "scsi scan: consider passing scsi_mod."
Kurt Garloff3424a652007-01-09 02:28:54 +01001116 "dev_flags=%s:%s:0x240 or 0x1000240\n",
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001117 scsi_inq_str(vend, result, 8, 16),
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001118 scsi_inq_str(mod, result, 16, 32));
1119 });
James Bottomley643eb2d2008-03-22 22:42:27 -05001120
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001121 }
James Bottomley643eb2d2008-03-22 22:42:27 -05001122
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 res = SCSI_SCAN_TARGET_PRESENT;
1124 goto out_free_result;
1125 }
1126
Alan Stern1bfc5d92006-02-09 15:26:18 -05001127 /*
dave wysochanski84961f22006-08-09 14:56:32 -04001128 * Some targets may set slight variations of PQ and PDT to signal
1129 * that no LUN is present, so don't add sdev in these cases.
1130 * Two specific examples are:
1131 * 1) NetApp targets: return PQ=1, PDT=0x1f
1132 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1133 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1134 *
1135 * References:
1136 * 1) SCSI SPC-3, pp. 145-146
1137 * PQ=1: "A peripheral device having the specified peripheral
1138 * device type is not connected to this logical unit. However, the
1139 * device server is capable of supporting the specified peripheral
1140 * device type on this logical unit."
1141 * PDT=0x1f: "Unknown or no device type"
1142 * 2) USB UFI 1.0, p. 20
1143 * PDT=00h Direct-access device (floppy)
1144 * PDT=1Fh none (no FDD connected to the requested logical unit)
Alan Stern1bfc5d92006-02-09 15:26:18 -05001145 */
dave wysochanski84961f22006-08-09 14:56:32 -04001146 if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) &&
James Bottomley01b291b2008-08-21 15:14:14 -05001147 (result[0] & 0x1f) == 0x1f &&
1148 !scsi_is_wlun(lun)) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001149 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
Alan Stern1bfc5d92006-02-09 15:26:18 -05001150 "scsi scan: peripheral device type"
1151 " of 31, no device added\n"));
1152 res = SCSI_SCAN_TARGET_PRESENT;
1153 goto out_free_result;
1154 }
1155
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001156 res = scsi_add_lun(sdev, result, &bflags, shost->async_scan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 if (res == SCSI_SCAN_LUN_PRESENT) {
1158 if (bflags & BLIST_KEY) {
1159 sdev->lockable = 0;
James Bottomley39216032005-06-15 18:48:29 -05001160 scsi_unlock_floptical(sdev, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 }
1163
1164 out_free_result:
1165 kfree(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166 out_free_sdev:
1167 if (res == SCSI_SCAN_LUN_PRESENT) {
1168 if (sdevp) {
Alan Sternb70d37b2005-07-26 10:30:40 -04001169 if (scsi_device_get(sdev) == 0) {
1170 *sdevp = sdev;
1171 } else {
1172 __scsi_remove_device(sdev);
1173 res = SCSI_SCAN_NO_RESPONSE;
1174 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001176 } else
James Bottomley860dc732009-11-19 17:48:29 -05001177 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178 out:
1179 return res;
1180}
1181
1182/**
1183 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1184 * @starget: pointer to target structure to scan
1185 * @bflags: black/white list flag for LUN 0
Rob Landleyeb448202007-11-03 13:30:39 -05001186 * @scsi_level: Which version of the standard does this device adhere to
1187 * @rescan: passed to scsi_probe_add_lun()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 *
1189 * Description:
1190 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1191 * scanned) to some maximum lun until a LUN is found with no device
1192 * attached. Use the bflags to figure out any oddities.
1193 *
1194 * Modifies sdevscan->lun.
1195 **/
1196static void scsi_sequential_lun_scan(struct scsi_target *starget,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001197 int bflags, int scsi_level, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198{
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001199 uint max_dev_lun;
1200 u64 sparse_lun, lun;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1202
Hannes Reinecke91921e02014-06-25 16:39:59 +02001203 SCSI_LOG_SCAN_BUS(3, starget_printk(KERN_INFO, starget,
1204 "scsi scan: Sequential scan\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205
1206 max_dev_lun = min(max_scsi_luns, shost->max_lun);
1207 /*
1208 * If this device is known to support sparse multiple units,
1209 * override the other settings, and scan all of them. Normally,
1210 * SCSI-3 devices should be scanned via the REPORT LUNS.
1211 */
1212 if (bflags & BLIST_SPARSELUN) {
1213 max_dev_lun = shost->max_lun;
1214 sparse_lun = 1;
1215 } else
1216 sparse_lun = 0;
1217
1218 /*
Mark Knibbsfb0d82f2014-10-09 12:39:40 +01001219 * If less than SCSI_1_CCS, and no special lun scanning, stop
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 * scanning; this matches 2.4 behaviour, but could just be a bug
Mark Knibbsfb0d82f2014-10-09 12:39:40 +01001221 * (to continue scanning a SCSI_1_CCS device).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 *
1223 * This test is broken. We might not have any device on lun0 for
1224 * a sparselun device, and if that's the case then how would we
1225 * know the real scsi_level, eh? It might make sense to just not
1226 * scan any SCSI_1 device for non-0 luns, but that check would best
1227 * go into scsi_alloc_sdev() and just have it return null when asked
1228 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1229 *
1230 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1231 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1232 == 0))
1233 return;
1234 */
1235 /*
1236 * If this device is known to support multiple units, override
1237 * the other settings, and scan all of them.
1238 */
1239 if (bflags & BLIST_FORCELUN)
1240 max_dev_lun = shost->max_lun;
1241 /*
1242 * REGAL CDC-4X: avoid hang after LUN 4
1243 */
1244 if (bflags & BLIST_MAX5LUN)
1245 max_dev_lun = min(5U, max_dev_lun);
1246 /*
1247 * Do not scan SCSI-2 or lower device past LUN 7, unless
1248 * BLIST_LARGELUN.
1249 */
1250 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
1251 max_dev_lun = min(8U, max_dev_lun);
1252
1253 /*
Hannes Reinecke22ffeb42014-06-03 10:58:53 +02001254 * Stop scanning at 255 unless BLIST_SCSI3LUN
1255 */
1256 if (!(bflags & BLIST_SCSI3LUN))
1257 max_dev_lun = min(256U, max_dev_lun);
1258
1259 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1261 * until we reach the max, or no LUN is found and we are not
1262 * sparse_lun.
1263 */
1264 for (lun = 1; lun < max_dev_lun; ++lun)
1265 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
1266 NULL) != SCSI_SCAN_LUN_PRESENT) &&
1267 !sparse_lun)
1268 return;
1269}
1270
1271/**
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001272 * scsilun_to_int - convert a scsi_lun to an int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 * @scsilun: struct scsi_lun to be converted.
1274 *
1275 * Description:
1276 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1277 * integer, and return the result. The caller must check for
1278 * truncation before using this function.
1279 *
1280 * Notes:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 * For a description of the LUN format, post SCSI-3 see the SCSI
1282 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1283 *
Hannes Reinecked9e5d612014-06-25 15:27:39 +02001284 * Given a struct scsi_lun of: d2 04 0b 03 00 00 00 00, this function
1285 * returns the integer: 0x0b03d204
1286 *
1287 * This encoding will return a standard integer LUN for LUNs smaller
1288 * than 256, which typically use a single level LUN structure with
1289 * addressing method 0.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290 **/
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001291u64 scsilun_to_int(struct scsi_lun *scsilun)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292{
1293 int i;
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001294 u64 lun;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295
1296 lun = 0;
1297 for (i = 0; i < sizeof(lun); i += 2)
Hannes Reinecked9e5d612014-06-25 15:27:39 +02001298 lun = lun | (((u64)scsilun->scsi_lun[i] << ((i + 1) * 8)) |
1299 ((u64)scsilun->scsi_lun[i + 1] << (i * 8)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300 return lun;
1301}
Christof Schmitt462b7852007-06-19 10:25:30 +02001302EXPORT_SYMBOL(scsilun_to_int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303
1304/**
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001305 * int_to_scsilun - reverts an int into a scsi_lun
Rob Landleyeb448202007-11-03 13:30:39 -05001306 * @lun: integer to be reverted
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001307 * @scsilun: struct scsi_lun to be set.
1308 *
1309 * Description:
1310 * Reverts the functionality of the scsilun_to_int, which packed
1311 * an 8-byte lun value into an int. This routine unpacks the int
1312 * back into the lun value.
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001313 *
1314 * Notes:
Hannes Reinecked9e5d612014-06-25 15:27:39 +02001315 * Given an integer : 0x0b03d204, this function returns a
1316 * struct scsi_lun of: d2 04 0b 03 00 00 00 00
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001317 *
1318 **/
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001319void int_to_scsilun(u64 lun, struct scsi_lun *scsilun)
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001320{
1321 int i;
1322
1323 memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
1324
1325 for (i = 0; i < sizeof(lun); i += 2) {
1326 scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
1327 scsilun->scsi_lun[i+1] = lun & 0xFF;
1328 lun = lun >> 16;
1329 }
1330}
1331EXPORT_SYMBOL(int_to_scsilun);
1332
1333/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
Rob Landleyeb448202007-11-03 13:30:39 -05001335 * @starget: which target
1336 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1337 * @rescan: nonzero if we can skip code only needed on first scan
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 *
1339 * Description:
Rob Landleyeb448202007-11-03 13:30:39 -05001340 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1341 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342 *
Rob Landleyeb448202007-11-03 13:30:39 -05001343 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1344 * LUNs even if it's older than SCSI-3.
1345 * If BLIST_NOREPORTLUN is set, return 1 always.
1346 * If BLIST_NOLUN is set, return 0 always.
Alan Stern09b6b512012-01-10 13:43:30 -05001347 * If starget->no_report_luns is set, return 1 always.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 *
1349 * Return:
1350 * 0: scan completed (or no memory, so further scanning is futile)
Rob Landleyeb448202007-11-03 13:30:39 -05001351 * 1: could not scan with REPORT LUN
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352 **/
James Bottomley6f3a2022005-09-22 20:33:28 -05001353static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 int rescan)
1355{
1356 char devname[64];
1357 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1358 unsigned int length;
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001359 u64 lun;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360 unsigned int num_luns;
1361 unsigned int retries;
James Bottomley39216032005-06-15 18:48:29 -05001362 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 struct scsi_lun *lunp, *lun_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 struct scsi_sense_hdr sshdr;
James Bottomley6f3a2022005-09-22 20:33:28 -05001365 struct scsi_device *sdev;
1366 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
Alan Stern2ef89192005-11-08 15:51:55 -05001367 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368
1369 /*
1370 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1371 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1372 * support more than 8 LUNs.
Alan Stern09b6b512012-01-10 13:43:30 -05001373 * Don't attempt if the target doesn't support REPORT LUNS.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 */
James Bottomley4d7db042006-03-31 20:07:45 -06001375 if (bflags & BLIST_NOREPORTLUN)
1376 return 1;
1377 if (starget->scsi_level < SCSI_2 &&
1378 starget->scsi_level != SCSI_UNKNOWN)
1379 return 1;
1380 if (starget->scsi_level < SCSI_3 &&
1381 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382 return 1;
1383 if (bflags & BLIST_NOLUN)
1384 return 0;
Alan Stern09b6b512012-01-10 13:43:30 -05001385 if (starget->no_report_luns)
1386 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387
James Bottomley6f3a2022005-09-22 20:33:28 -05001388 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1389 sdev = scsi_alloc_sdev(starget, 0, NULL);
1390 if (!sdev)
1391 return 0;
Alan Stern75f8ee82010-02-12 12:13:31 -05001392 if (scsi_device_get(sdev)) {
1393 __scsi_remove_device(sdev);
James Bottomley6f3a2022005-09-22 20:33:28 -05001394 return 0;
Alan Stern75f8ee82010-02-12 12:13:31 -05001395 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001396 }
1397
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 sprintf(devname, "host %d channel %d id %d",
James Bottomley6f3a2022005-09-22 20:33:28 -05001399 shost->host_no, sdev->channel, sdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400
1401 /*
1402 * Allocate enough to hold the header (the same size as one scsi_lun)
Rob Eversacd6d732014-12-16 11:01:20 -05001403 * plus the number of luns we are requesting. 511 was the default
1404 * value of the now removed max_report_luns parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405 */
Rob Eversacd6d732014-12-16 11:01:20 -05001406 length = (511 + 1) * sizeof(struct scsi_lun);
1407retry:
Rob Everseb9eea02014-12-16 11:01:18 -05001408 lun_data = kmalloc(length, GFP_KERNEL |
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
James Bottomley6f3a2022005-09-22 20:33:28 -05001410 if (!lun_data) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001411 printk(ALLOC_FAILURE_MSG, __func__);
James Bottomley39216032005-06-15 18:48:29 -05001412 goto out;
James Bottomley6f3a2022005-09-22 20:33:28 -05001413 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414
1415 scsi_cmd[0] = REPORT_LUNS;
1416
1417 /*
1418 * bytes 1 - 5: reserved, set to zero.
1419 */
1420 memset(&scsi_cmd[1], 0, 5);
1421
1422 /*
1423 * bytes 6 - 9: length of the command.
1424 */
Rob Evers2a904e52014-12-16 11:01:19 -05001425 put_unaligned_be32(length, &scsi_cmd[6]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426
1427 scsi_cmd[10] = 0; /* reserved */
1428 scsi_cmd[11] = 0; /* control */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429
1430 /*
1431 * We can get a UNIT ATTENTION, for example a power on/reset, so
1432 * retry a few times (like sd.c does for TEST UNIT READY).
1433 * Experience shows some combinations of adapter/devices get at
1434 * least two power on/resets.
1435 *
1436 * Illegal requests (for devices that do not support REPORT LUNS)
1437 * should come through as a check condition, and will not generate
1438 * a retry.
1439 */
1440 for (retries = 0; retries < 3; retries++) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001441 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1442 "scsi scan: Sending REPORT LUNS to (try %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443 retries));
James Bottomley39216032005-06-15 18:48:29 -05001444
James Bottomley39216032005-06-15 18:48:29 -05001445 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001446 lun_data, length, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09001447 SCSI_TIMEOUT + 4 * HZ, 3, NULL);
James Bottomley39216032005-06-15 18:48:29 -05001448
Hannes Reinecke91921e02014-06-25 16:39:59 +02001449 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1450 "scsi scan: REPORT LUNS"
1451 " %s (try %d) result 0x%x\n",
1452 result ? "failed" : "successful",
1453 retries, result));
James Bottomley39216032005-06-15 18:48:29 -05001454 if (result == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455 break;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001456 else if (scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 if (sshdr.sense_key != UNIT_ATTENTION)
1458 break;
1459 }
1460 }
1461
James Bottomley39216032005-06-15 18:48:29 -05001462 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463 /*
1464 * The device probably does not support a REPORT LUN command
1465 */
Alan Stern2ef89192005-11-08 15:51:55 -05001466 ret = 1;
1467 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469
1470 /*
1471 * Get the length from the first four bytes of lun_data.
1472 */
Rob Eversacd6d732014-12-16 11:01:20 -05001473 if (get_unaligned_be32(lun_data->scsi_lun) +
1474 sizeof(struct scsi_lun) > length) {
1475 length = get_unaligned_be32(lun_data->scsi_lun) +
1476 sizeof(struct scsi_lun);
1477 kfree(lun_data);
1478 goto retry;
1479 }
Rob Evers2a904e52014-12-16 11:01:19 -05001480 length = get_unaligned_be32(lun_data->scsi_lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481
1482 num_luns = (length / sizeof(struct scsi_lun));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001484 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1485 "scsi scan: REPORT LUN scan\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486
1487 /*
1488 * Scan the luns in lun_data. The entry at offset 0 is really
1489 * the header, so start at 1 and go up to and including num_luns.
1490 */
1491 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1492 lun = scsilun_to_int(lunp);
1493
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001494 if (lun > sdev->host->max_lun) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001495 sdev_printk(KERN_WARNING, sdev,
1496 "lun%llu has a LUN larger than"
1497 " allowed by the host adapter\n", lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 } else {
1499 int res;
1500
1501 res = scsi_probe_and_add_lun(starget,
1502 lun, NULL, NULL, rescan, NULL);
1503 if (res == SCSI_SCAN_NO_RESPONSE) {
1504 /*
1505 * Got some results, but now none, abort.
1506 */
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001507 sdev_printk(KERN_ERR, sdev,
1508 "Unexpected response"
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001509 " from lun %llu while scanning, scan"
1510 " aborted\n", (unsigned long long)lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 break;
1512 }
1513 }
1514 }
1515
Alan Stern2ef89192005-11-08 15:51:55 -05001516 out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517 kfree(lun_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518 out:
James Bottomley6f3a2022005-09-22 20:33:28 -05001519 scsi_device_put(sdev);
James Bottomley0f1d87a2008-08-22 16:43:59 -05001520 if (scsi_device_created(sdev))
James Bottomley6f3a2022005-09-22 20:33:28 -05001521 /*
1522 * the sdev we used didn't appear in the report luns scan
1523 */
James Bottomley860dc732009-11-19 17:48:29 -05001524 __scsi_remove_device(sdev);
Alan Stern2ef89192005-11-08 15:51:55 -05001525 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526}
1527
1528struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001529 uint id, u64 lun, void *hostdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530{
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001531 struct scsi_device *sdev = ERR_PTR(-ENODEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532 struct device *parent = &shost->shost_gendev;
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001533 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534
Matthew Wilcox938e2ac2007-01-15 18:07:09 -07001535 if (strncmp(scsi_scan_type, "none", 4) == 0)
1536 return ERR_PTR(-ENODEV);
1537
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001538 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539 if (!starget)
1540 return ERR_PTR(-ENOMEM);
Alan Sternbc4f2402010-06-17 10:41:42 -04001541 scsi_autopm_get_target(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542
Arjan van de Ven0b950672006-01-11 13:16:10 +01001543 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001544 if (!shost->async_scan)
1545 scsi_complete_async_scans();
1546
Alan Sternbc4f2402010-06-17 10:41:42 -04001547 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001548 scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
Alan Sternbc4f2402010-06-17 10:41:42 -04001549 scsi_autopm_put_host(shost);
1550 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001551 mutex_unlock(&shost->scan_mutex);
Alan Sternbc4f2402010-06-17 10:41:42 -04001552 scsi_autopm_put_target(starget);
James Bottomleye63ed0d2014-01-21 07:00:50 -08001553 /*
1554 * paired with scsi_alloc_target(). Target will be destroyed unless
1555 * scsi_probe_and_add_lun made an underlying device visible
1556 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557 scsi_target_reap(starget);
1558 put_device(&starget->dev);
1559
1560 return sdev;
1561}
1562EXPORT_SYMBOL(__scsi_add_device);
1563
James Bottomley146f7262005-09-10 12:44:09 -05001564int scsi_add_device(struct Scsi_Host *host, uint channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001565 uint target, u64 lun)
James Bottomley146f7262005-09-10 12:44:09 -05001566{
1567 struct scsi_device *sdev =
1568 __scsi_add_device(host, channel, target, lun, NULL);
1569 if (IS_ERR(sdev))
1570 return PTR_ERR(sdev);
1571
1572 scsi_device_put(sdev);
1573 return 0;
1574}
1575EXPORT_SYMBOL(scsi_add_device);
1576
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577void scsi_rescan_device(struct device *dev)
1578{
Christoph Hellwige27829d2015-02-02 14:01:24 +01001579 device_lock(dev);
1580 if (dev->driver && try_module_get(dev->driver->owner)) {
Christoph Hellwig3af6b352014-11-12 18:34:51 +01001581 struct scsi_driver *drv = to_scsi_driver(dev->driver);
1582
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583 if (drv->rescan)
1584 drv->rescan(dev);
Christoph Hellwig3af6b352014-11-12 18:34:51 +01001585 module_put(dev->driver->owner);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586 }
Christoph Hellwige27829d2015-02-02 14:01:24 +01001587 device_unlock(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588}
1589EXPORT_SYMBOL(scsi_rescan_device);
1590
Alan Sterne517d312005-07-26 10:18:45 -04001591static void __scsi_scan_target(struct device *parent, unsigned int channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001592 unsigned int id, u64 lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593{
1594 struct Scsi_Host *shost = dev_to_shost(parent);
1595 int bflags = 0;
1596 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597 struct scsi_target *starget;
1598
1599 if (shost->this_id == id)
1600 /*
1601 * Don't scan the host adapter
1602 */
1603 return;
1604
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606 if (!starget)
1607 return;
Alan Sternbc4f2402010-06-17 10:41:42 -04001608 scsi_autopm_get_target(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 if (lun != SCAN_WILD_CARD) {
1611 /*
1612 * Scan for a specific host/chan/id/lun.
1613 */
1614 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1615 goto out_reap;
1616 }
1617
1618 /*
1619 * Scan LUN 0, if there is some response, scan further. Ideally, we
1620 * would not configure LUN 0 until all LUNs are scanned.
1621 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001622 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1623 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1624 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001625 /*
1626 * The REPORT LUN did not scan the target,
1627 * do a sequential scan.
1628 */
1629 scsi_sequential_lun_scan(starget, bflags,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001630 starget->scsi_level, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632
1633 out_reap:
Alan Sternbc4f2402010-06-17 10:41:42 -04001634 scsi_autopm_put_target(starget);
James Bottomleye63ed0d2014-01-21 07:00:50 -08001635 /*
1636 * paired with scsi_alloc_target(): determine if the target has
1637 * any children at all and if not, nuke it
1638 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639 scsi_target_reap(starget);
1640
1641 put_device(&starget->dev);
1642}
Alan Sterne517d312005-07-26 10:18:45 -04001643
1644/**
Randy Dunlape59e4a02008-02-29 22:02:50 -08001645 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
Alan Sterne517d312005-07-26 10:18:45 -04001646 * @parent: host to scan
1647 * @channel: channel to scan
1648 * @id: target id to scan
1649 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1650 * @rescan: passed to LUN scanning routines
1651 *
1652 * Description:
1653 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1654 * and possibly all LUNs on the target id.
1655 *
1656 * First try a REPORT LUN scan, if that does not scan the target, do a
1657 * sequential scan of LUNs on the target id.
1658 **/
1659void scsi_scan_target(struct device *parent, unsigned int channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001660 unsigned int id, u64 lun, int rescan)
Alan Sterne517d312005-07-26 10:18:45 -04001661{
1662 struct Scsi_Host *shost = dev_to_shost(parent);
1663
Matthew Wilcox93b45af2006-11-22 13:24:53 -07001664 if (strncmp(scsi_scan_type, "none", 4) == 0)
1665 return;
1666
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001667 mutex_lock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001668 if (!shost->async_scan)
1669 scsi_complete_async_scans();
1670
Alan Sternbc4f2402010-06-17 10:41:42 -04001671 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Alan Sterne517d312005-07-26 10:18:45 -04001672 __scsi_scan_target(parent, channel, id, lun, rescan);
Alan Sternbc4f2402010-06-17 10:41:42 -04001673 scsi_autopm_put_host(shost);
1674 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001675 mutex_unlock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001676}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001677EXPORT_SYMBOL(scsi_scan_target);
1678
1679static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001680 unsigned int id, u64 lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681{
1682 uint order_id;
1683
1684 if (id == SCAN_WILD_CARD)
1685 for (id = 0; id < shost->max_id; ++id) {
1686 /*
1687 * XXX adapter drivers when possible (FCP, iSCSI)
1688 * could modify max_id to match the current max,
1689 * not the absolute max.
1690 *
1691 * XXX add a shost id iterator, so for example,
1692 * the FC ID can be the same as a target id
1693 * without a huge overhead of sparse id's.
1694 */
1695 if (shost->reverse_ordering)
1696 /*
1697 * Scan from high to low id.
1698 */
1699 order_id = shost->max_id - id - 1;
1700 else
1701 order_id = id;
Alan Sterne517d312005-07-26 10:18:45 -04001702 __scsi_scan_target(&shost->shost_gendev, channel,
1703 order_id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704 }
1705 else
Alan Sterne517d312005-07-26 10:18:45 -04001706 __scsi_scan_target(&shost->shost_gendev, channel,
1707 id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708}
1709
1710int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001711 unsigned int id, u64 lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712{
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001713 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001714 "%s: <%u:%u:%llu>\n",
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001715 __func__, channel, id, lun));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716
1717 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
Amit Arora091686d2006-05-19 16:14:50 -07001718 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
Mark Knibbs605c6db2014-10-09 12:39:48 +01001719 ((lun != SCAN_WILD_CARD) && (lun >= shost->max_lun)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720 return -EINVAL;
1721
Arjan van de Ven0b950672006-01-11 13:16:10 +01001722 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001723 if (!shost->async_scan)
1724 scsi_complete_async_scans();
1725
Alan Sternbc4f2402010-06-17 10:41:42 -04001726 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Mike Anderson82f29462005-06-16 11:14:33 -07001727 if (channel == SCAN_WILD_CARD)
1728 for (channel = 0; channel <= shost->max_channel;
1729 channel++)
1730 scsi_scan_channel(shost, channel, id, lun,
1731 rescan);
1732 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001733 scsi_scan_channel(shost, channel, id, lun, rescan);
Alan Sternbc4f2402010-06-17 10:41:42 -04001734 scsi_autopm_put_host(shost);
Mike Anderson82f29462005-06-16 11:14:33 -07001735 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001736 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737
1738 return 0;
1739}
1740
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001741static void scsi_sysfs_add_devices(struct Scsi_Host *shost)
1742{
1743 struct scsi_device *sdev;
1744 shost_for_each_device(sdev, shost) {
Dan Williams3b661a92012-06-21 23:47:28 -07001745 /* target removed before the device could be added */
1746 if (sdev->sdev_state == SDEV_DEL)
1747 continue;
Subhash Jadavani693ad5b2014-09-25 15:32:20 +03001748 /* If device is already visible, skip adding it to sysfs */
1749 if (sdev->is_visible)
1750 continue;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001751 if (!scsi_host_scan_allowed(shost) ||
1752 scsi_sysfs_add_sdev(sdev) != 0)
James Bottomley860dc732009-11-19 17:48:29 -05001753 __scsi_remove_device(sdev);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001754 }
1755}
1756
1757/**
1758 * scsi_prep_async_scan - prepare for an async scan
1759 * @shost: the host which will be scanned
1760 * Returns: a cookie to be passed to scsi_finish_async_scan()
1761 *
1762 * Tells the midlayer this host is going to do an asynchronous scan.
1763 * It reserves the host's position in the scanning list and ensures
1764 * that other asynchronous scans started after this one won't affect the
1765 * ordering of the discovered devices.
1766 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001767static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001768{
1769 struct async_scan_data *data;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001770 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001771
1772 if (strncmp(scsi_scan_type, "sync", 4) == 0)
1773 return NULL;
1774
1775 if (shost->async_scan) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001776 shost_printk(KERN_INFO, shost, "%s called twice\n", __func__);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001777 dump_stack();
1778 return NULL;
1779 }
1780
1781 data = kmalloc(sizeof(*data), GFP_KERNEL);
1782 if (!data)
1783 goto err;
1784 data->shost = scsi_host_get(shost);
1785 if (!data->shost)
1786 goto err;
1787 init_completion(&data->prev_finished);
1788
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001789 mutex_lock(&shost->scan_mutex);
1790 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001791 shost->async_scan = 1;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001792 spin_unlock_irqrestore(shost->host_lock, flags);
1793 mutex_unlock(&shost->scan_mutex);
1794
1795 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001796 if (list_empty(&scanning_hosts))
1797 complete(&data->prev_finished);
1798 list_add_tail(&data->list, &scanning_hosts);
1799 spin_unlock(&async_scan_lock);
1800
1801 return data;
1802
1803 err:
1804 kfree(data);
1805 return NULL;
1806}
1807
1808/**
1809 * scsi_finish_async_scan - asynchronous scan has finished
1810 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1811 *
1812 * All the devices currently attached to this host have been found.
1813 * This function announces all the devices it has found to the rest
1814 * of the system.
1815 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001816static void scsi_finish_async_scan(struct async_scan_data *data)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001817{
1818 struct Scsi_Host *shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001819 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001820
1821 if (!data)
1822 return;
1823
1824 shost = data->shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001825
1826 mutex_lock(&shost->scan_mutex);
1827
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001828 if (!shost->async_scan) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001829 shost_printk(KERN_INFO, shost, "%s called twice\n", __func__);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001830 dump_stack();
Julia Lawall773e82f2008-07-21 09:58:30 +02001831 mutex_unlock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001832 return;
1833 }
1834
1835 wait_for_completion(&data->prev_finished);
1836
1837 scsi_sysfs_add_devices(shost);
1838
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001839 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001840 shost->async_scan = 0;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001841 spin_unlock_irqrestore(shost->host_lock, flags);
1842
1843 mutex_unlock(&shost->scan_mutex);
1844
1845 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001846 list_del(&data->list);
1847 if (!list_empty(&scanning_hosts)) {
1848 struct async_scan_data *next = list_entry(scanning_hosts.next,
1849 struct async_scan_data, list);
1850 complete(&next->prev_finished);
1851 }
1852 spin_unlock(&async_scan_lock);
1853
Huajun Li267a6ad2012-02-12 19:59:14 +08001854 scsi_autopm_put_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001855 scsi_host_put(shost);
1856 kfree(data);
1857}
1858
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001859static void do_scsi_scan_host(struct Scsi_Host *shost)
1860{
1861 if (shost->hostt->scan_finished) {
1862 unsigned long start = jiffies;
1863 if (shost->hostt->scan_start)
1864 shost->hostt->scan_start(shost);
1865
1866 while (!shost->hostt->scan_finished(shost, jiffies - start))
1867 msleep(10);
1868 } else {
1869 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1870 SCAN_WILD_CARD, 0);
1871 }
1872}
1873
Dan Williams6cdd5522012-07-09 19:33:35 -07001874static void do_scan_async(void *_data, async_cookie_t c)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001875{
1876 struct async_scan_data *data = _data;
Alan Sternbc4f2402010-06-17 10:41:42 -04001877 struct Scsi_Host *shost = data->shost;
1878
1879 do_scsi_scan_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001880 scsi_finish_async_scan(data);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001881}
1882
Linus Torvalds1da177e2005-04-16 15:20:36 -07001883/**
1884 * scsi_scan_host - scan the given adapter
1885 * @shost: adapter to scan
1886 **/
1887void scsi_scan_host(struct Scsi_Host *shost)
1888{
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001889 struct async_scan_data *data;
1890
1891 if (strncmp(scsi_scan_type, "none", 4) == 0)
1892 return;
Alan Sternbc4f2402010-06-17 10:41:42 -04001893 if (scsi_autopm_get_host(shost) < 0)
1894 return;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001895
1896 data = scsi_prep_async_scan(shost);
1897 if (!data) {
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001898 do_scsi_scan_host(shost);
Alan Sternbc4f2402010-06-17 10:41:42 -04001899 scsi_autopm_put_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001900 return;
1901 }
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001902
Dan Williams6cdd5522012-07-09 19:33:35 -07001903 /* register with the async subsystem so wait_for_device_probe()
1904 * will flush this work
1905 */
1906 async_schedule(do_scan_async, data);
1907
Huajun Li267a6ad2012-02-12 19:59:14 +08001908 /* scsi_autopm_put_host(shost) is called in scsi_finish_async_scan() */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909}
1910EXPORT_SYMBOL(scsi_scan_host);
1911
Linus Torvalds1da177e2005-04-16 15:20:36 -07001912void scsi_forget_host(struct Scsi_Host *shost)
1913{
Alan Sterna64358d2005-07-26 10:27:10 -04001914 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915 unsigned long flags;
1916
Alan Sterna64358d2005-07-26 10:27:10 -04001917 restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918 spin_lock_irqsave(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001919 list_for_each_entry(sdev, &shost->__devices, siblings) {
1920 if (sdev->sdev_state == SDEV_DEL)
1921 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922 spin_unlock_irqrestore(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001923 __scsi_remove_device(sdev);
1924 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925 }
1926 spin_unlock_irqrestore(shost->host_lock, flags);
1927}
1928
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001929/**
1930 * scsi_get_host_dev - Create a scsi_device that points to the host adapter itself
1931 * @shost: Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932 *
1933 * Lock status: None assumed.
1934 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001935 * Returns: The scsi_device or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936 *
1937 * Notes:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001938 * Attach a single scsi_device to the Scsi_Host - this should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939 * be made to look like a "pseudo-device" that points to the
1940 * HA itself.
1941 *
1942 * Note - this device is not accessible from any high-level
1943 * drivers (including generics), which is probably not
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001944 * optimal. We can add hooks later to attach.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001945 */
1946struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1947{
Alan Sterne517d312005-07-26 10:18:45 -04001948 struct scsi_device *sdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949 struct scsi_target *starget;
1950
Arjan van de Ven0b950672006-01-11 13:16:10 +01001951 mutex_lock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001952 if (!scsi_host_scan_allowed(shost))
1953 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1955 if (!starget)
Alan Sterne517d312005-07-26 10:18:45 -04001956 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001957
1958 sdev = scsi_alloc_sdev(starget, 0, NULL);
Alan Sternd5469112010-02-12 12:13:39 -05001959 if (sdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001960 sdev->borken = 0;
Alan Sternd5469112010-02-12 12:13:39 -05001961 else
James Bottomley884d25c2006-09-05 16:26:41 -05001962 scsi_target_reap(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001963 put_device(&starget->dev);
Alan Sterne517d312005-07-26 10:18:45 -04001964 out:
Arjan van de Ven0b950672006-01-11 13:16:10 +01001965 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001966 return sdev;
1967}
1968EXPORT_SYMBOL(scsi_get_host_dev);
1969
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001970/**
1971 * scsi_free_host_dev - Free a scsi_device that points to the host adapter itself
1972 * @sdev: Host device to be freed
Linus Torvalds1da177e2005-04-16 15:20:36 -07001973 *
1974 * Lock status: None assumed.
1975 *
1976 * Returns: Nothing
Linus Torvalds1da177e2005-04-16 15:20:36 -07001977 */
1978void scsi_free_host_dev(struct scsi_device *sdev)
1979{
1980 BUG_ON(sdev->id != sdev->host->this_id);
1981
James Bottomley860dc732009-11-19 17:48:29 -05001982 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001983}
1984EXPORT_SYMBOL(scsi_free_host_dev);
1985