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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * scsi_scan.c
3 *
4 * Copyright (C) 2000 Eric Youngdale,
5 * Copyright (C) 2002 Patrick Mansfield
6 *
7 * The general scanning/probing algorithm is as follows, exceptions are
8 * made to it depending on device specific flags, compilation options, and
9 * global variable (boot or module load time) settings.
10 *
11 * A specific LUN is scanned via an INQUIRY command; if the LUN has a
Christoph Hellwigf64a1812005-10-31 18:32:08 +010012 * device attached, a scsi_device is allocated and setup for it.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
14 * For every id of every channel on the given host:
15 *
16 * Scan LUN 0; if the target responds to LUN 0 (even if there is no
17 * device or storage attached to LUN 0):
18 *
19 * If LUN 0 has a device attached, allocate and setup a
Christoph Hellwigf64a1812005-10-31 18:32:08 +010020 * scsi_device for it.
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 *
22 * If target is SCSI-3 or up, issue a REPORT LUN, and scan
23 * all of the LUNs returned by the REPORT LUN; else,
24 * sequentially scan LUNs up until some maximum is reached,
25 * or a LUN is seen that cannot have a device attached to it.
26 */
27
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/module.h>
29#include <linux/moduleparam.h>
30#include <linux/init.h>
31#include <linux/blkdev.h>
Matthew Wilcox3e082a92006-09-28 15:19:20 -060032#include <linux/delay.h>
33#include <linux/kthread.h>
34#include <linux/spinlock.h>
Arjan van de Ven4ace92f2009-01-04 05:32:28 -080035#include <linux/async.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090036#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38#include <scsi/scsi.h>
Christoph Hellwigbeb40482006-06-10 18:01:03 +020039#include <scsi/scsi_cmnd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <scsi/scsi_device.h>
41#include <scsi/scsi_driver.h>
42#include <scsi/scsi_devinfo.h>
43#include <scsi/scsi_host.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <scsi/scsi_transport.h>
45#include <scsi/scsi_eh.h>
46
47#include "scsi_priv.h"
48#include "scsi_logging.h"
49
50#define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
51 " SCSI scanning, some SCSI devices might not be configured\n"
52
53/*
54 * Default timeout
55 */
56#define SCSI_TIMEOUT (2*HZ)
57
58/*
Robert P. J. Day405ae7d2007-02-17 19:13:42 +010059 * Prefix values for the SCSI id's (stored in sysfs name field)
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 */
61#define SCSI_UID_SER_NUM 'S'
62#define SCSI_UID_UNKNOWN 'Z'
63
64/*
65 * Return values of some of the scanning functions.
66 *
67 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
68 * includes allocation or general failures preventing IO from being sent.
69 *
70 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
71 * on the given LUN.
72 *
73 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
74 * given LUN.
75 */
76#define SCSI_SCAN_NO_RESPONSE 0
77#define SCSI_SCAN_TARGET_PRESENT 1
78#define SCSI_SCAN_LUN_PRESENT 2
79
Arjan van de Ven0ad78202005-11-28 16:22:25 +010080static const char *scsi_null_device_strs = "nullnullnullnull";
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
82#define MAX_SCSI_LUNS 512
83
Hannes Reinecke1abf6352014-06-25 15:27:38 +020084static u64 max_scsi_luns = MAX_SCSI_LUNS;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
Hannes Reinecke1abf6352014-06-25 15:27:38 +020086module_param_named(max_luns, max_scsi_luns, ullong, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087MODULE_PARM_DESC(max_luns,
Hannes Reinecke1abf6352014-06-25 15:27:38 +020088 "last scsi LUN (should be between 1 and 2^64-1)");
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Matthew Wilcox21db1882006-11-22 13:24:52 -070090#ifdef CONFIG_SCSI_SCAN_ASYNC
91#define SCSI_SCAN_TYPE_DEFAULT "async"
92#else
93#define SCSI_SCAN_TYPE_DEFAULT "sync"
94#endif
95
Dan Williams3c31b522014-04-10 15:30:35 -070096char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT;
Matthew Wilcox3e082a92006-09-28 15:19:20 -060097
98module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO);
99MODULE_PARM_DESC(scan, "sync, async or none");
100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101/*
102 * max_scsi_report_luns: the maximum number of LUNS that will be
103 * returned from the REPORT LUNS command. 8 times this value must
104 * be allocated. In theory this could be up to an 8 byte value, but
105 * in practice, the maximum number of LUNs suppored by any device
106 * is about 16k.
107 */
108static unsigned int max_scsi_report_luns = 511;
109
Masatake YAMATO10f4b892007-09-19 22:59:16 +0900110module_param_named(max_report_luns, max_scsi_report_luns, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111MODULE_PARM_DESC(max_report_luns,
112 "REPORT LUNS maximum number of LUNS received (should be"
113 " between 1 and 16384)");
114
Alan Stern14faf122009-03-12 11:08:51 -0400115static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ + 18;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Masatake YAMATO10f4b892007-09-19 22:59:16 +0900117module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118MODULE_PARM_DESC(inq_timeout,
119 "Timeout (in seconds) waiting for devices to answer INQUIRY."
Alan Stern14faf122009-03-12 11:08:51 -0400120 " Default is 20. Some devices may need more; most need less.");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
Matthew Wilcox6b7f1232007-06-26 15:18:51 -0600122/* This lock protects only this list */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600123static DEFINE_SPINLOCK(async_scan_lock);
124static LIST_HEAD(scanning_hosts);
125
126struct async_scan_data {
127 struct list_head list;
128 struct Scsi_Host *shost;
129 struct completion prev_finished;
130};
131
132/**
133 * scsi_complete_async_scans - Wait for asynchronous scans to complete
134 *
Matthew Wilcox8bcc2412006-12-07 19:29:27 -0700135 * When this function returns, any host which started scanning before
136 * this function was called will have finished its scan. Hosts which
137 * started scanning after this function was called may or may not have
138 * finished.
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600139 */
140int scsi_complete_async_scans(void)
141{
142 struct async_scan_data *data;
143
144 do {
145 if (list_empty(&scanning_hosts))
Dan Williamse96eb232012-07-09 19:33:45 -0700146 return 0;
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600147 /* If we can't get memory immediately, that's OK. Just
148 * sleep a little. Even if we never get memory, the async
149 * scans will finish eventually.
150 */
151 data = kmalloc(sizeof(*data), GFP_KERNEL);
152 if (!data)
153 msleep(1);
154 } while (!data);
155
156 data->shost = NULL;
157 init_completion(&data->prev_finished);
158
159 spin_lock(&async_scan_lock);
160 /* Check that there's still somebody else on the list */
161 if (list_empty(&scanning_hosts))
162 goto done;
163 list_add_tail(&data->list, &scanning_hosts);
164 spin_unlock(&async_scan_lock);
165
166 printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n");
167 wait_for_completion(&data->prev_finished);
168
169 spin_lock(&async_scan_lock);
170 list_del(&data->list);
Matthew Wilcox8bcc2412006-12-07 19:29:27 -0700171 if (!list_empty(&scanning_hosts)) {
172 struct async_scan_data *next = list_entry(scanning_hosts.next,
173 struct async_scan_data, list);
174 complete(&next->prev_finished);
175 }
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600176 done:
177 spin_unlock(&async_scan_lock);
Dan Williamse96eb232012-07-09 19:33:45 -0700178
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600179 kfree(data);
180 return 0;
181}
182
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183/**
184 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
James Bottomley39216032005-06-15 18:48:29 -0500185 * @sdev: scsi device to send command to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 * @result: area to store the result of the MODE SENSE
187 *
188 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500189 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 * Called for BLIST_KEY devices.
191 **/
James Bottomley39216032005-06-15 18:48:29 -0500192static void scsi_unlock_floptical(struct scsi_device *sdev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 unsigned char *result)
194{
195 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
196
Hannes Reinecke91921e02014-06-25 16:39:59 +0200197 sdev_printk(KERN_NOTICE, sdev, "unlocking floptical drive\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 scsi_cmd[0] = MODE_SENSE;
199 scsi_cmd[1] = 0;
200 scsi_cmd[2] = 0x2e;
201 scsi_cmd[3] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500202 scsi_cmd[4] = 0x2a; /* size */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 scsi_cmd[5] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500204 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900205 SCSI_TIMEOUT, 3, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206}
207
208/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 * scsi_alloc_sdev - allocate and setup a scsi_Device
Rob Landleyeb448202007-11-03 13:30:39 -0500210 * @starget: which target to allocate a &scsi_device for
211 * @lun: which lun
212 * @hostdata: usually NULL and set by ->slave_alloc instead
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 *
214 * Description:
215 * Allocate, initialize for io, and return a pointer to a scsi_Device.
216 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
217 * adds scsi_Device to the appropriate list.
218 *
219 * Return value:
220 * scsi_Device pointer, or NULL on failure.
221 **/
222static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +0200223 u64 lun, void *hostdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224{
225 struct scsi_device *sdev;
226 int display_failure_msg = 1, ret;
227 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
Jeff Garzika341cd02007-10-29 17:15:22 -0400228 extern void scsi_evt_thread(struct work_struct *work);
Jens Axboe9937a5e2011-05-17 11:04:44 +0200229 extern void scsi_requeue_run_queue(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
Jes Sorensen24669f752006-01-16 10:31:18 -0500231 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 GFP_ATOMIC);
233 if (!sdev)
234 goto out;
235
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 sdev->vendor = scsi_null_device_strs;
237 sdev->model = scsi_null_device_strs;
238 sdev->rev = scsi_null_device_strs;
239 sdev->host = shost;
Vasu Dev4a840672009-10-22 15:46:33 -0700240 sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 sdev->id = starget->id;
242 sdev->lun = lun;
243 sdev->channel = starget->channel;
244 sdev->sdev_state = SDEV_CREATED;
245 INIT_LIST_HEAD(&sdev->siblings);
246 INIT_LIST_HEAD(&sdev->same_target_siblings);
247 INIT_LIST_HEAD(&sdev->cmd_list);
248 INIT_LIST_HEAD(&sdev->starved_entry);
Jeff Garzika341cd02007-10-29 17:15:22 -0400249 INIT_LIST_HEAD(&sdev->event_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 spin_lock_init(&sdev->list_lock);
Jeff Garzika341cd02007-10-29 17:15:22 -0400251 INIT_WORK(&sdev->event_work, scsi_evt_thread);
Jens Axboe9937a5e2011-05-17 11:04:44 +0200252 INIT_WORK(&sdev->requeue_work, scsi_requeue_run_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
254 sdev->sdev_gendev.parent = get_device(&starget->dev);
255 sdev->sdev_target = starget;
256
257 /* usually NULL and set by ->slave_alloc instead */
258 sdev->hostdata = hostdata;
259
260 /* if the device needs this changing, it may do so in the
261 * slave_configure function */
262 sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
263
264 /*
265 * Some low level driver could use device->type
266 */
267 sdev->type = -1;
268
269 /*
270 * Assume that the device will have handshaking problems,
271 * and then fix this field later if it turns out it
272 * doesn't
273 */
274 sdev->borken = 1;
275
Christoph Hellwigd2852032014-01-17 12:06:53 +0100276 if (shost_use_blk_mq(shost))
277 sdev->request_queue = scsi_mq_alloc_queue(sdev);
278 else
279 sdev->request_queue = scsi_alloc_queue(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 if (!sdev->request_queue) {
281 /* release fn is set up in scsi_sysfs_device_initialise, so
282 * have to free and put manually here */
283 put_device(&starget->dev);
Dave Jones93f560892006-03-09 10:21:27 -0500284 kfree(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 goto out;
286 }
Tejun Heo09ac46c2011-12-14 00:33:38 +0100287 WARN_ON_ONCE(!blk_get_queue(sdev->request_queue));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 sdev->request_queue->queuedata = sdev;
289 scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
290
291 scsi_sysfs_device_initialize(sdev);
292
293 if (shost->hostt->slave_alloc) {
294 ret = shost->hostt->slave_alloc(sdev);
295 if (ret) {
296 /*
297 * if LLDD reports slave not present, don't clutter
298 * console with alloc failure messages
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 */
300 if (ret == -ENXIO)
301 display_failure_msg = 0;
302 goto out_device_destroy;
303 }
304 }
305
306 return sdev;
307
308out_device_destroy:
James Bottomley4e6c82b2011-11-07 08:51:24 -0600309 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310out:
311 if (display_failure_msg)
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700312 printk(ALLOC_FAILURE_MSG, __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 return NULL;
314}
315
James Bottomley643eb2d2008-03-22 22:42:27 -0500316static void scsi_target_destroy(struct scsi_target *starget)
317{
318 struct device *dev = &starget->dev;
319 struct Scsi_Host *shost = dev_to_shost(dev->parent);
320 unsigned long flags;
321
James Bottomleyf2495e22014-01-21 07:01:41 -0800322 starget->state = STARGET_DEL;
James Bottomley643eb2d2008-03-22 22:42:27 -0500323 transport_destroy_device(dev);
324 spin_lock_irqsave(shost->host_lock, flags);
325 if (shost->hostt->target_destroy)
326 shost->hostt->target_destroy(starget);
327 list_del_init(&starget->siblings);
328 spin_unlock_irqrestore(shost->host_lock, flags);
329 put_device(dev);
330}
331
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332static void scsi_target_dev_release(struct device *dev)
333{
334 struct device *parent = dev->parent;
335 struct scsi_target *starget = to_scsi_target(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500336
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 kfree(starget);
338 put_device(parent);
339}
340
Adrian Bunk453cd0f2008-07-03 23:47:33 -0700341static struct device_type scsi_target_type = {
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100342 .name = "scsi_target",
343 .release = scsi_target_dev_release,
344};
345
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346int scsi_is_target_device(const struct device *dev)
347{
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100348 return dev->type == &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349}
350EXPORT_SYMBOL(scsi_is_target_device);
351
352static struct scsi_target *__scsi_find_target(struct device *parent,
353 int channel, uint id)
354{
355 struct scsi_target *starget, *found_starget = NULL;
356 struct Scsi_Host *shost = dev_to_shost(parent);
357 /*
358 * Search for an existing target for this sdev.
359 */
360 list_for_each_entry(starget, &shost->__targets, siblings) {
361 if (starget->id == id &&
362 starget->channel == channel) {
363 found_starget = starget;
364 break;
365 }
366 }
367 if (found_starget)
368 get_device(&found_starget->dev);
369
370 return found_starget;
371}
372
James Bottomley884d25c2006-09-05 16:26:41 -0500373/**
James Bottomleye63ed0d2014-01-21 07:00:50 -0800374 * scsi_target_reap_ref_release - remove target from visibility
375 * @kref: the reap_ref in the target being released
376 *
377 * Called on last put of reap_ref, which is the indication that no device
378 * under this target is visible anymore, so render the target invisible in
379 * sysfs. Note: we have to be in user context here because the target reaps
380 * should be done in places where the scsi device visibility is being removed.
381 */
382static void scsi_target_reap_ref_release(struct kref *kref)
383{
384 struct scsi_target *starget
385 = container_of(kref, struct scsi_target, reap_ref);
386
James Bottomleyf2495e22014-01-21 07:01:41 -0800387 /*
388 * if we get here and the target is still in the CREATED state that
389 * means it was allocated but never made visible (because a scan
390 * turned up no LUNs), so don't call device_del() on it.
391 */
392 if (starget->state != STARGET_CREATED) {
393 transport_remove_device(&starget->dev);
394 device_del(&starget->dev);
395 }
James Bottomleye63ed0d2014-01-21 07:00:50 -0800396 scsi_target_destroy(starget);
397}
398
399static void scsi_target_reap_ref_put(struct scsi_target *starget)
400{
401 kref_put(&starget->reap_ref, scsi_target_reap_ref_release);
402}
403
404/**
James Bottomley884d25c2006-09-05 16:26:41 -0500405 * scsi_alloc_target - allocate a new or find an existing target
406 * @parent: parent of the target (need not be a scsi host)
407 * @channel: target channel number (zero if no channels)
408 * @id: target id number
409 *
410 * Return an existing target if one exists, provided it hasn't already
411 * gone into STARGET_DEL state, otherwise allocate a new target.
412 *
413 * The target is returned with an incremented reference, so the caller
414 * is responsible for both reaping and doing a last put
415 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416static struct scsi_target *scsi_alloc_target(struct device *parent,
417 int channel, uint id)
418{
419 struct Scsi_Host *shost = dev_to_shost(parent);
420 struct device *dev = NULL;
421 unsigned long flags;
422 const int size = sizeof(struct scsi_target)
423 + shost->transportt->target_size;
James.Smart@Emulex.Com5c44cd22005-06-10 22:24:30 -0400424 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 struct scsi_target *found_target;
James Bottomleye63ed0d2014-01-21 07:00:50 -0800426 int error, ref_got;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
Jes Sorensen24669f752006-01-16 10:31:18 -0500428 starget = kzalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 if (!starget) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700430 printk(KERN_ERR "%s: allocation failure\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 return NULL;
432 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 dev = &starget->dev;
434 device_initialize(dev);
James Bottomleye63ed0d2014-01-21 07:00:50 -0800435 kref_init(&starget->reap_ref);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 dev->parent = get_device(parent);
Kay Sievers71610f52008-12-03 22:41:36 +0100437 dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id);
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100438 dev->bus = &scsi_bus_type;
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100439 dev->type = &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 starget->id = id;
441 starget->channel = channel;
Mike Christief0c0a372008-08-17 15:24:38 -0500442 starget->can_queue = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 INIT_LIST_HEAD(&starget->siblings);
444 INIT_LIST_HEAD(&starget->devices);
James Bottomley643eb2d2008-03-22 22:42:27 -0500445 starget->state = STARGET_CREATED;
Alan Stern7c9d6f12007-01-08 11:12:32 -0500446 starget->scsi_level = SCSI_2;
Edward Gogginc53a2842009-04-09 10:02:22 -0700447 starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED;
James Bottomleyffedb452006-02-23 14:27:18 -0600448 retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 spin_lock_irqsave(shost->host_lock, flags);
450
451 found_target = __scsi_find_target(parent, channel, id);
452 if (found_target)
453 goto found;
454
455 list_add_tail(&starget->siblings, &shost->__targets);
456 spin_unlock_irqrestore(shost->host_lock, flags);
457 /* allocate and add */
James Bottomleya283bd32005-05-24 12:06:38 -0500458 transport_setup_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500459 if (shost->hostt->target_alloc) {
Brian King32f95792006-02-22 14:28:24 -0600460 error = shost->hostt->target_alloc(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500461
462 if(error) {
463 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
464 /* don't want scsi_target_reap to do the final
465 * put because it will be under the host lock */
James Bottomley643eb2d2008-03-22 22:42:27 -0500466 scsi_target_destroy(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500467 return NULL;
468 }
469 }
James Bottomley884d25c2006-09-05 16:26:41 -0500470 get_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500471
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 return starget;
473
474 found:
James Bottomleye63ed0d2014-01-21 07:00:50 -0800475 /*
476 * release routine already fired if kref is zero, so if we can still
477 * take the reference, the target must be alive. If we can't, it must
478 * be dying and we need to wait for a new target
479 */
480 ref_got = kref_get_unless_zero(&found_target->reap_ref);
481
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 spin_unlock_irqrestore(shost->host_lock, flags);
James Bottomleye63ed0d2014-01-21 07:00:50 -0800483 if (ref_got) {
Alan Stern12fb8c12010-03-18 15:41:22 -0400484 put_device(dev);
James Bottomleyffedb452006-02-23 14:27:18 -0600485 return found_target;
486 }
James Bottomleye63ed0d2014-01-21 07:00:50 -0800487 /*
488 * Unfortunately, we found a dying target; need to wait until it's
489 * dead before we can get a new one. There is an anomaly here. We
490 * *should* call scsi_target_reap() to balance the kref_get() of the
491 * reap_ref above. However, since the target being released, it's
492 * already invisible and the reap_ref is irrelevant. If we call
493 * scsi_target_reap() we might spuriously do another device_del() on
494 * an already invisible target.
495 */
James Bottomleyffedb452006-02-23 14:27:18 -0600496 put_device(&found_target->dev);
James Bottomleye63ed0d2014-01-21 07:00:50 -0800497 /*
498 * length of time is irrelevant here, we just want to yield the CPU
499 * for a tick to avoid busy waiting for the target to die.
500 */
501 msleep(1);
James Bottomleyffedb452006-02-23 14:27:18 -0600502 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503}
504
505/**
506 * scsi_target_reap - check to see if target is in use and destroy if not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 * @starget: target to be checked
508 *
509 * This is used after removing a LUN or doing a last put of the target
510 * it checks atomically that nothing is using the target and removes
511 * it if so.
512 */
513void scsi_target_reap(struct scsi_target *starget)
514{
James Bottomleyf2495e22014-01-21 07:01:41 -0800515 /*
516 * serious problem if this triggers: STARGET_DEL is only set in the if
517 * the reap_ref drops to zero, so we're trying to do another final put
518 * on an already released kref
519 */
James Bottomleye63ed0d2014-01-21 07:00:50 -0800520 BUG_ON(starget->state == STARGET_DEL);
James Bottomleyf2495e22014-01-21 07:01:41 -0800521 scsi_target_reap_ref_put(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522}
523
524/**
Alan Sterne5b3cd42006-08-21 15:53:25 -0400525 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
526 * @s: INQUIRY result string to sanitize
527 * @len: length of the string
528 *
529 * Description:
530 * The SCSI spec says that INQUIRY vendor, product, and revision
531 * strings must consist entirely of graphic ASCII characters,
532 * padded on the right with spaces. Since not all devices obey
533 * this rule, we will replace non-graphic or non-ASCII characters
534 * with spaces. Exception: a NUL character is interpreted as a
535 * string terminator, so all the following characters are set to
536 * spaces.
537 **/
538static void sanitize_inquiry_string(unsigned char *s, int len)
539{
540 int terminated = 0;
541
542 for (; len > 0; (--len, ++s)) {
543 if (*s == 0)
544 terminated = 1;
545 if (terminated || *s < 0x20 || *s > 0x7e)
546 *s = ' ';
547 }
548}
549
550/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
James Bottomley39216032005-06-15 18:48:29 -0500552 * @sdev: scsi_device to probe
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 * @inq_result: area to store the INQUIRY result
James Bottomley39216032005-06-15 18:48:29 -0500554 * @result_len: len of inq_result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 * @bflags: store any bflags found here
556 *
557 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500558 * Probe the lun associated with @req using a standard SCSI INQUIRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 *
James Bottomley39216032005-06-15 18:48:29 -0500560 * If the INQUIRY is successful, zero is returned and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100562 * are copied to the scsi_device any flags value is stored in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400564static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
James Bottomley39216032005-06-15 18:48:29 -0500565 int result_len, int *bflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
568 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
569 int response_len = 0;
James Bottomley39216032005-06-15 18:48:29 -0500570 int pass, count, result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 struct scsi_sense_hdr sshdr;
572
573 *bflags = 0;
574
575 /* Perform up to 3 passes. The first pass uses a conservative
576 * transfer length of 36 unless sdev->inquiry_len specifies a
577 * different value. */
578 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
579 try_inquiry_len = first_inquiry_len;
580 pass = 1;
581
582 next_pass:
James Bottomley9ccfc752005-10-02 11:45:08 -0500583 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
584 "scsi scan: INQUIRY pass %d length %d\n",
585 pass, try_inquiry_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586
587 /* Each pass gets up to three chances to ignore Unit Attention */
588 for (count = 0; count < 3; ++count) {
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900589 int resid;
590
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 memset(scsi_cmd, 0, 6);
592 scsi_cmd[0] = INQUIRY;
593 scsi_cmd[4] = (unsigned char) try_inquiry_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
595 memset(inq_result, 0, try_inquiry_len);
James Bottomley39216032005-06-15 18:48:29 -0500596
597 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -0500598 inq_result, try_inquiry_len, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900599 HZ / 2 + HZ * scsi_inq_timeout, 3,
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900600 &resid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601
Hannes Reinecke91921e02014-06-25 16:39:59 +0200602 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
603 "scsi scan: INQUIRY %s with code 0x%x\n",
James Bottomley39216032005-06-15 18:48:29 -0500604 result ? "failed" : "successful", result));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605
James Bottomley39216032005-06-15 18:48:29 -0500606 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 /*
608 * not-ready to ready transition [asc/ascq=0x28/0x0]
609 * or power-on, reset [asc/ascq=0x29/0x0], continue.
610 * INQUIRY should not yield UNIT_ATTENTION
611 * but many buggy devices do so anyway.
612 */
James Bottomley39216032005-06-15 18:48:29 -0500613 if ((driver_byte(result) & DRIVER_SENSE) &&
James Bottomleyea73a9f2005-08-28 11:33:52 -0500614 scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 if ((sshdr.sense_key == UNIT_ATTENTION) &&
616 ((sshdr.asc == 0x28) ||
617 (sshdr.asc == 0x29)) &&
618 (sshdr.ascq == 0))
619 continue;
620 }
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900621 } else {
622 /*
623 * if nothing was transferred, we try
624 * again. It's a workaround for some USB
625 * devices.
626 */
627 if (resid == try_inquiry_len)
628 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 }
630 break;
631 }
632
James Bottomley39216032005-06-15 18:48:29 -0500633 if (result == 0) {
Alan Sterne5b3cd42006-08-21 15:53:25 -0400634 sanitize_inquiry_string(&inq_result[8], 8);
635 sanitize_inquiry_string(&inq_result[16], 16);
636 sanitize_inquiry_string(&inq_result[32], 4);
637
638 response_len = inq_result[4] + 5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 if (response_len > 255)
640 response_len = first_inquiry_len; /* sanity */
641
642 /*
643 * Get any flags for this device.
644 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100645 * XXX add a bflags to scsi_device, and replace the
646 * corresponding bit fields in scsi_device, so bflags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 * need not be passed as an argument.
648 */
649 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
650 &inq_result[16]);
651
652 /* When the first pass succeeds we gain information about
653 * what larger transfer lengths might work. */
654 if (pass == 1) {
655 if (BLIST_INQUIRY_36 & *bflags)
656 next_inquiry_len = 36;
657 else if (BLIST_INQUIRY_58 & *bflags)
658 next_inquiry_len = 58;
659 else if (sdev->inquiry_len)
660 next_inquiry_len = sdev->inquiry_len;
661 else
662 next_inquiry_len = response_len;
663
664 /* If more data is available perform the second pass */
665 if (next_inquiry_len > try_inquiry_len) {
666 try_inquiry_len = next_inquiry_len;
667 pass = 2;
668 goto next_pass;
669 }
670 }
671
672 } else if (pass == 2) {
Hannes Reinecke91921e02014-06-25 16:39:59 +0200673 sdev_printk(KERN_INFO, sdev,
674 "scsi scan: %d byte inquiry failed. "
675 "Consider BLIST_INQUIRY_36 for this device\n",
676 try_inquiry_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677
678 /* If this pass failed, the third pass goes back and transfers
679 * the same amount as we successfully got in the first pass. */
680 try_inquiry_len = first_inquiry_len;
681 pass = 3;
682 goto next_pass;
683 }
684
685 /* If the last transfer attempt got an error, assume the
686 * peripheral doesn't exist or is dead. */
James Bottomley39216032005-06-15 18:48:29 -0500687 if (result)
688 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689
690 /* Don't report any more data than the device says is valid */
691 sdev->inquiry_len = min(try_inquiry_len, response_len);
692
693 /*
694 * XXX Abort if the response length is less than 36? If less than
695 * 32, the lookup of the device flags (above) could be invalid,
696 * and it would be possible to take an incorrect action - we do
697 * not want to hang because of a short INQUIRY. On the flip side,
698 * if the device is spun down or becoming ready (and so it gives a
699 * short INQUIRY), an abort here prevents any further use of the
700 * device, including spin up.
701 *
Alan Sterne423ee32007-02-16 01:46:38 -0800702 * On the whole, the best approach seems to be to assume the first
703 * 36 bytes are valid no matter what the device says. That's
704 * better than copying < 36 bytes to the inquiry-result buffer
705 * and displaying garbage for the Vendor, Product, or Revision
706 * strings.
707 */
708 if (sdev->inquiry_len < 36) {
Hannes Reinecke91921e02014-06-25 16:39:59 +0200709 sdev_printk(KERN_INFO, sdev,
710 "scsi scan: INQUIRY result too short (%d),"
711 " using 36\n", sdev->inquiry_len);
Alan Sterne423ee32007-02-16 01:46:38 -0800712 sdev->inquiry_len = 36;
713 }
714
715 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 * Related to the above issue:
717 *
718 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
719 * and if not ready, sent a START_STOP to start (maybe spin up) and
720 * then send the INQUIRY again, since the INQUIRY can change after
721 * a device is initialized.
722 *
723 * Ideally, start a device if explicitly asked to do so. This
724 * assumes that a device is spun up on power on, spun down on
725 * request, and then spun up on request.
726 */
727
728 /*
729 * The scanning code needs to know the scsi_level, even if no
730 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
731 * non-zero LUNs can be scanned.
732 */
733 sdev->scsi_level = inq_result[2] & 0x07;
734 if (sdev->scsi_level >= 2 ||
735 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
736 sdev->scsi_level++;
James Bottomley6f3a2022005-09-22 20:33:28 -0500737 sdev->sdev_target->scsi_level = sdev->scsi_level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738
Alan Stern50c4e962014-09-02 11:35:50 -0400739 /*
740 * If SCSI-2 or lower, and if the transport requires it,
741 * store the LUN value in CDB[1].
742 */
743 sdev->lun_in_cdb = 0;
744 if (sdev->scsi_level <= SCSI_2 &&
745 sdev->scsi_level != SCSI_UNKNOWN &&
746 !sdev->host->no_scsi2_lun_in_cdb)
747 sdev->lun_in_cdb = 1;
748
James Bottomley39216032005-06-15 18:48:29 -0500749 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750}
751
752/**
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100753 * scsi_add_lun - allocate and fully initialze a scsi_device
Matthew Wilcox6d877682007-07-11 12:54:55 -0600754 * @sdev: holds information to be stored in the new scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 * @inq_result: holds the result of a previous INQUIRY to the LUN
756 * @bflags: black/white list flag
Matthew Wilcox6d877682007-07-11 12:54:55 -0600757 * @async: 1 if this device is being scanned asynchronously
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 *
759 * Description:
Matthew Wilcox6d877682007-07-11 12:54:55 -0600760 * Initialize the scsi_device @sdev. Optionally set fields based
761 * on values in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 *
763 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100764 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
765 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400767static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600768 int *bflags, int async)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769{
James Bottomley6f4267e2008-08-22 16:53:31 -0500770 int ret;
771
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 /*
773 * XXX do not save the inquiry, since it can change underneath us,
774 * save just vendor/model/rev.
775 *
776 * Rather than save it and have an ioctl that retrieves the saved
777 * value, have an ioctl that executes the same INQUIRY code used
778 * in scsi_probe_lun, let user level programs doing INQUIRY
779 * scanning run at their own risk, or supply a user level program
780 * that can correctly scan.
781 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782
Alan Stern09123d22006-11-10 12:27:57 -0800783 /*
784 * Copy at least 36 bytes of INQUIRY data, so that we don't
785 * dereference unallocated memory when accessing the Vendor,
786 * Product, and Revision strings. Badly behaved devices may set
787 * the INQUIRY Additional Length byte to a small value, indicating
788 * these strings are invalid, but often they contain plausible data
789 * nonetheless. It doesn't matter if the device sent < 36 bytes
790 * total, since scsi_probe_lun() initializes inq_result with 0s.
791 */
792 sdev->inquiry = kmemdup(inq_result,
793 max_t(size_t, sdev->inquiry_len, 36),
794 GFP_ATOMIC);
795 if (sdev->inquiry == NULL)
796 return SCSI_SCAN_NO_RESPONSE;
797
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 sdev->vendor = (char *) (sdev->inquiry + 8);
799 sdev->model = (char *) (sdev->inquiry + 16);
800 sdev->rev = (char *) (sdev->inquiry + 32);
801
James Bottomley14216562012-07-25 23:55:55 +0400802 if (strncmp(sdev->vendor, "ATA ", 8) == 0) {
803 /*
804 * sata emulation layer device. This is a hack to work around
805 * the SATL power management specifications which state that
806 * when the SATL detects the device has gone into standby
807 * mode, it shall respond with NOT READY.
808 */
809 sdev->allow_restart = 1;
810 }
811
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 if (*bflags & BLIST_ISROM) {
Matthew Wilcox6d877682007-07-11 12:54:55 -0600813 sdev->type = TYPE_ROM;
814 sdev->removable = 1;
815 } else {
816 sdev->type = (inq_result[0] & 0x1f);
817 sdev->removable = (inq_result[1] & 0x80) >> 7;
Subhash Jadavani45341ca2014-09-25 15:32:19 +0300818
819 /*
820 * some devices may respond with wrong type for
821 * well-known logical units. Force well-known type
822 * to enumerate them correctly.
823 */
824 if (scsi_is_wlun(sdev->lun) && sdev->type != TYPE_WLUN) {
825 sdev_printk(KERN_WARNING, sdev,
826 "%s: correcting incorrect peripheral device type 0x%x for W-LUN 0x%16xhN\n",
827 __func__, sdev->type, (unsigned int)sdev->lun);
828 sdev->type = TYPE_WLUN;
829 }
830
Matthew Wilcox6d877682007-07-11 12:54:55 -0600831 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832
Matthew Wilcox6d877682007-07-11 12:54:55 -0600833 if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {
834 /* RBC and MMC devices can return SCSI-3 compliance and yet
835 * still not support REPORT LUNS, so make them act as
836 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
837 * specifically set */
838 if ((*bflags & BLIST_REPORTLUN2) == 0)
839 *bflags |= BLIST_NOREPORTLUN;
840 }
841
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 /*
843 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
844 * spec says: The device server is capable of supporting the
845 * specified peripheral device type on this logical unit. However,
846 * the physical device is not currently connected to this logical
847 * unit.
848 *
849 * The above is vague, as it implies that we could treat 001 and
850 * 011 the same. Stay compatible with previous code, and create a
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100851 * scsi_device for a PQ of 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 *
853 * Don't set the device offline here; rather let the upper
854 * level drivers eval the PQ to decide whether they should
855 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
856 */
857
858 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 sdev->lockable = sdev->removable;
860 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
861
Matthew Wilcox6d877682007-07-11 12:54:55 -0600862 if (sdev->scsi_level >= SCSI_3 ||
863 (sdev->inquiry_len > 56 && inq_result[56] & 0x04))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 sdev->ppr = 1;
865 if (inq_result[7] & 0x60)
866 sdev->wdtr = 1;
867 if (inq_result[7] & 0x10)
868 sdev->sdtr = 1;
869
James Bottomley19ac0db2006-08-06 18:15:22 -0500870 sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d "
Matthew Wilcox4ff36712006-07-04 12:15:20 -0600871 "ANSI: %d%s\n", scsi_device_type(sdev->type),
872 sdev->vendor, sdev->model, sdev->rev,
873 sdev->inq_periph_qual, inq_result[2] & 0x07,
874 (inq_result[3] & 0x0f) == 1 ? " CCS" : "");
875
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
877 !(*bflags & BLIST_NOTQ))
878 sdev->tagged_supported = 1;
Matthew Wilcox6d877682007-07-11 12:54:55 -0600879
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 /*
881 * Some devices (Texel CD ROM drives) have handshaking problems
882 * when used with the Seagate controllers. borken is initialized
883 * to 1, and then set it to 0 here.
884 */
885 if ((*bflags & BLIST_BORKEN) == 0)
886 sdev->borken = 0;
887
Matthew Wilcox6d877682007-07-11 12:54:55 -0600888 if (*bflags & BLIST_NO_ULD_ATTACH)
889 sdev->no_uld_attach = 1;
890
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 /*
892 * Apparently some really broken devices (contrary to the SCSI
893 * standards) need to be selected without asserting ATN
894 */
895 if (*bflags & BLIST_SELECT_NO_ATN)
896 sdev->select_no_atn = 1;
897
898 /*
James Bottomley4d7db042006-03-31 20:07:45 -0600899 * Maximum 512 sector transfer length
900 * broken RA4x00 Compaq Disk Array
901 */
902 if (*bflags & BLIST_MAX_512)
Martin K. Petersen086fa5f2010-02-26 00:20:38 -0500903 blk_queue_max_hw_sectors(sdev->request_queue, 512);
James Bottomley4d7db042006-03-31 20:07:45 -0600904
905 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 * Some devices may not want to have a start command automatically
907 * issued when a device is added.
908 */
909 if (*bflags & BLIST_NOSTARTONADD)
910 sdev->no_start_on_add = 1;
911
912 if (*bflags & BLIST_SINGLELUN)
Tony Battersby25d7c362007-11-12 10:00:44 -0500913 scsi_target(sdev)->single_lun = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 sdev->use_10_for_rw = 1;
916
917 if (*bflags & BLIST_MS_SKIP_PAGE_08)
918 sdev->skip_ms_page_8 = 1;
919
920 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
921 sdev->skip_ms_page_3f = 1;
922
923 if (*bflags & BLIST_USE_10_BYTE_MS)
924 sdev->use_10_for_ms = 1;
925
Janusz Dziemidowicz02134362014-07-24 15:48:46 +0200926 /* some devices don't like REPORT SUPPORTED OPERATION CODES
927 * and will simply timeout causing sd_mod init to take a very
928 * very long time */
929 if (*bflags & BLIST_NO_RSOC)
930 sdev->no_report_opcodes = 1;
931
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 /* set the device running here so that slave configure
933 * may do I/O */
James Bottomley6f4267e2008-08-22 16:53:31 -0500934 ret = scsi_device_set_state(sdev, SDEV_RUNNING);
935 if (ret) {
936 ret = scsi_device_set_state(sdev, SDEV_BLOCK);
937
938 if (ret) {
939 sdev_printk(KERN_ERR, sdev,
940 "in wrong state %s to complete scan\n",
941 scsi_device_state_name(sdev->sdev_state));
942 return SCSI_SCAN_NO_RESPONSE;
943 }
944 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945
946 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
947 sdev->use_192_bytes_for_3f = 1;
948
949 if (*bflags & BLIST_NOT_LOCKABLE)
950 sdev->lockable = 0;
951
952 if (*bflags & BLIST_RETRY_HWERROR)
953 sdev->retry_hwerror = 1;
954
Martin K. Petersend974e422012-08-28 14:29:35 -0400955 if (*bflags & BLIST_NO_DIF)
956 sdev->no_dif = 1;
957
Martin K. Petersen0816c922013-05-10 10:36:04 -0400958 sdev->eh_timeout = SCSI_DEFAULT_EH_TIMEOUT;
959
Martin K. Petersenc1d40a52014-07-15 12:49:17 -0400960 if (*bflags & BLIST_TRY_VPD_PAGES)
961 sdev->try_vpd_pages = 1;
962 else if (*bflags & BLIST_SKIP_VPD_PAGES)
Martin K. Petersen56f2a802013-04-24 21:19:47 -0400963 sdev->skip_vpd_pages = 1;
964
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 transport_configure_device(&sdev->sdev_gendev);
966
Christoph Hellwig93805092006-02-17 12:11:29 +0100967 if (sdev->host->hostt->slave_configure) {
James Bottomley6f4267e2008-08-22 16:53:31 -0500968 ret = sdev->host->hostt->slave_configure(sdev);
Christoph Hellwig93805092006-02-17 12:11:29 +0100969 if (ret) {
970 /*
971 * if LLDD reports slave not present, don't clutter
972 * console with alloc failure messages
973 */
974 if (ret != -ENXIO) {
975 sdev_printk(KERN_ERR, sdev,
976 "failed to configure device\n");
977 }
978 return SCSI_SCAN_NO_RESPONSE;
979 }
980 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981
Hannes Reineckeb3ae8782014-03-15 09:51:49 +0100982 if (sdev->scsi_level >= SCSI_3)
983 scsi_attach_vpd(sdev);
984
Vasu Dev4a840672009-10-22 15:46:33 -0700985 sdev->max_queue_depth = sdev->queue_depth;
986
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 /*
988 * Ok, the device is now all set up, we can
989 * register it and tell the rest of the kernel
990 * about it.
991 */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600992 if (!async && scsi_sysfs_add_sdev(sdev) != 0)
Alan Sternb24b1032005-07-27 11:43:46 -0700993 return SCSI_SCAN_NO_RESPONSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994
995 return SCSI_SCAN_LUN_PRESENT;
996}
997
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700998#ifdef CONFIG_SCSI_LOGGING
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200999/**
Rob Landleyeb448202007-11-03 13:30:39 -05001000 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001001 * @buf: Output buffer with at least end-first+1 bytes of space
1002 * @inq: Inquiry buffer (input)
1003 * @first: Offset of string into inq
1004 * @end: Index after last character in inq
1005 */
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001006static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001007 unsigned first, unsigned end)
1008{
1009 unsigned term = 0, idx;
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001010
1011 for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
1012 if (inq[idx+first] > ' ') {
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001013 buf[idx] = inq[idx+first];
1014 term = idx+1;
1015 } else {
1016 buf[idx] = ' ';
1017 }
1018 }
1019 buf[term] = 0;
1020 return buf;
1021}
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001022#endif
James Bottomley6f3a2022005-09-22 20:33:28 -05001023
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024/**
1025 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
1026 * @starget: pointer to target device structure
1027 * @lun: LUN of target device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028 * @bflagsp: store bflags here if not NULL
Rob Landleyeb448202007-11-03 13:30:39 -05001029 * @sdevp: probe the LUN corresponding to this scsi_device
1030 * @rescan: if nonzero skip some code only needed on first scan
1031 * @hostdata: passed to scsi_alloc_sdev()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 *
1033 * Description:
1034 * Call scsi_probe_lun, if a LUN with an attached device is found,
1035 * allocate and set it up by calling scsi_add_lun.
1036 *
1037 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001038 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
1040 * attached at the LUN
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001041 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 **/
1043static int scsi_probe_and_add_lun(struct scsi_target *starget,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001044 u64 lun, int *bflagsp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 struct scsi_device **sdevp, int rescan,
1046 void *hostdata)
1047{
1048 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 unsigned char *result;
James Bottomley39216032005-06-15 18:48:29 -05001050 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1052
1053 /*
1054 * The rescan flag is used as an optimization, the first scan of a
1055 * host adapter calls into here with rescan == 0.
1056 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001057 sdev = scsi_device_lookup_by_target(starget, lun);
1058 if (sdev) {
James Bottomley0f1d87a2008-08-22 16:43:59 -05001059 if (rescan || !scsi_device_created(sdev)) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001060 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 "scsi scan: device exists on %s\n",
Kay Sievers71610f52008-12-03 22:41:36 +01001062 dev_name(&sdev->sdev_gendev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 if (sdevp)
1064 *sdevp = sdev;
1065 else
1066 scsi_device_put(sdev);
1067
1068 if (bflagsp)
1069 *bflagsp = scsi_get_device_flags(sdev,
1070 sdev->vendor,
1071 sdev->model);
1072 return SCSI_SCAN_LUN_PRESENT;
1073 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001074 scsi_device_put(sdev);
1075 } else
1076 sdev = scsi_alloc_sdev(starget, lun, hostdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 if (!sdev)
1078 goto out;
James Bottomley39216032005-06-15 18:48:29 -05001079
1080 result = kmalloc(result_len, GFP_ATOMIC |
Al Virobc861202005-04-24 12:28:34 -07001081 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 if (!result)
James Bottomley39216032005-06-15 18:48:29 -05001083 goto out_free_sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084
James Bottomley39216032005-06-15 18:48:29 -05001085 if (scsi_probe_lun(sdev, result, result_len, &bflags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086 goto out_free_result;
1087
Kurt Garloff4186ab12006-04-03 15:16:48 +02001088 if (bflagsp)
1089 *bflagsp = bflags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 /*
1091 * result contains valid SCSI INQUIRY data.
1092 */
Kurt Garloff13f7e5a2006-04-03 15:20:08 +02001093 if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 /*
1095 * For a Peripheral qualifier 3 (011b), the SCSI
1096 * spec says: The device server is not capable of
1097 * supporting a physical device on this logical
1098 * unit.
1099 *
1100 * For disks, this implies that there is no
1101 * logical disk configured at sdev->lun, but there
1102 * is a target id responding.
1103 */
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001104 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
1105 " peripheral qualifier of 3, device not"
1106 " added\n"))
1107 if (lun == 0) {
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001108 SCSI_LOG_SCAN_BUS(1, {
1109 unsigned char vend[9];
1110 unsigned char mod[17];
1111
1112 sdev_printk(KERN_INFO, sdev,
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001113 "scsi scan: consider passing scsi_mod."
Kurt Garloff3424a652007-01-09 02:28:54 +01001114 "dev_flags=%s:%s:0x240 or 0x1000240\n",
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001115 scsi_inq_str(vend, result, 8, 16),
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001116 scsi_inq_str(mod, result, 16, 32));
1117 });
James Bottomley643eb2d2008-03-22 22:42:27 -05001118
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001119 }
James Bottomley643eb2d2008-03-22 22:42:27 -05001120
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121 res = SCSI_SCAN_TARGET_PRESENT;
1122 goto out_free_result;
1123 }
1124
Alan Stern1bfc5d92006-02-09 15:26:18 -05001125 /*
dave wysochanski84961f22006-08-09 14:56:32 -04001126 * Some targets may set slight variations of PQ and PDT to signal
1127 * that no LUN is present, so don't add sdev in these cases.
1128 * Two specific examples are:
1129 * 1) NetApp targets: return PQ=1, PDT=0x1f
1130 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1131 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1132 *
1133 * References:
1134 * 1) SCSI SPC-3, pp. 145-146
1135 * PQ=1: "A peripheral device having the specified peripheral
1136 * device type is not connected to this logical unit. However, the
1137 * device server is capable of supporting the specified peripheral
1138 * device type on this logical unit."
1139 * PDT=0x1f: "Unknown or no device type"
1140 * 2) USB UFI 1.0, p. 20
1141 * PDT=00h Direct-access device (floppy)
1142 * PDT=1Fh none (no FDD connected to the requested logical unit)
Alan Stern1bfc5d92006-02-09 15:26:18 -05001143 */
dave wysochanski84961f22006-08-09 14:56:32 -04001144 if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) &&
James Bottomley01b291b2008-08-21 15:14:14 -05001145 (result[0] & 0x1f) == 0x1f &&
1146 !scsi_is_wlun(lun)) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001147 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
Alan Stern1bfc5d92006-02-09 15:26:18 -05001148 "scsi scan: peripheral device type"
1149 " of 31, no device added\n"));
1150 res = SCSI_SCAN_TARGET_PRESENT;
1151 goto out_free_result;
1152 }
1153
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001154 res = scsi_add_lun(sdev, result, &bflags, shost->async_scan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 if (res == SCSI_SCAN_LUN_PRESENT) {
1156 if (bflags & BLIST_KEY) {
1157 sdev->lockable = 0;
James Bottomley39216032005-06-15 18:48:29 -05001158 scsi_unlock_floptical(sdev, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160 }
1161
1162 out_free_result:
1163 kfree(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 out_free_sdev:
1165 if (res == SCSI_SCAN_LUN_PRESENT) {
1166 if (sdevp) {
Alan Sternb70d37b2005-07-26 10:30:40 -04001167 if (scsi_device_get(sdev) == 0) {
1168 *sdevp = sdev;
1169 } else {
1170 __scsi_remove_device(sdev);
1171 res = SCSI_SCAN_NO_RESPONSE;
1172 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001174 } else
James Bottomley860dc732009-11-19 17:48:29 -05001175 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 out:
1177 return res;
1178}
1179
1180/**
1181 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1182 * @starget: pointer to target structure to scan
1183 * @bflags: black/white list flag for LUN 0
Rob Landleyeb448202007-11-03 13:30:39 -05001184 * @scsi_level: Which version of the standard does this device adhere to
1185 * @rescan: passed to scsi_probe_add_lun()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 *
1187 * Description:
1188 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1189 * scanned) to some maximum lun until a LUN is found with no device
1190 * attached. Use the bflags to figure out any oddities.
1191 *
1192 * Modifies sdevscan->lun.
1193 **/
1194static void scsi_sequential_lun_scan(struct scsi_target *starget,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001195 int bflags, int scsi_level, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196{
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001197 uint max_dev_lun;
1198 u64 sparse_lun, lun;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1200
Hannes Reinecke91921e02014-06-25 16:39:59 +02001201 SCSI_LOG_SCAN_BUS(3, starget_printk(KERN_INFO, starget,
1202 "scsi scan: Sequential scan\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203
1204 max_dev_lun = min(max_scsi_luns, shost->max_lun);
1205 /*
1206 * If this device is known to support sparse multiple units,
1207 * override the other settings, and scan all of them. Normally,
1208 * SCSI-3 devices should be scanned via the REPORT LUNS.
1209 */
1210 if (bflags & BLIST_SPARSELUN) {
1211 max_dev_lun = shost->max_lun;
1212 sparse_lun = 1;
1213 } else
1214 sparse_lun = 0;
1215
1216 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 * If less than SCSI_1_CSS, and no special lun scaning, stop
1218 * scanning; this matches 2.4 behaviour, but could just be a bug
1219 * (to continue scanning a SCSI_1_CSS device).
1220 *
1221 * This test is broken. We might not have any device on lun0 for
1222 * a sparselun device, and if that's the case then how would we
1223 * know the real scsi_level, eh? It might make sense to just not
1224 * scan any SCSI_1 device for non-0 luns, but that check would best
1225 * go into scsi_alloc_sdev() and just have it return null when asked
1226 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1227 *
1228 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1229 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1230 == 0))
1231 return;
1232 */
1233 /*
1234 * If this device is known to support multiple units, override
1235 * the other settings, and scan all of them.
1236 */
1237 if (bflags & BLIST_FORCELUN)
1238 max_dev_lun = shost->max_lun;
1239 /*
1240 * REGAL CDC-4X: avoid hang after LUN 4
1241 */
1242 if (bflags & BLIST_MAX5LUN)
1243 max_dev_lun = min(5U, max_dev_lun);
1244 /*
1245 * Do not scan SCSI-2 or lower device past LUN 7, unless
1246 * BLIST_LARGELUN.
1247 */
1248 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
1249 max_dev_lun = min(8U, max_dev_lun);
1250
1251 /*
Hannes Reinecke22ffeb42014-06-03 10:58:53 +02001252 * Stop scanning at 255 unless BLIST_SCSI3LUN
1253 */
1254 if (!(bflags & BLIST_SCSI3LUN))
1255 max_dev_lun = min(256U, max_dev_lun);
1256
1257 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1259 * until we reach the max, or no LUN is found and we are not
1260 * sparse_lun.
1261 */
1262 for (lun = 1; lun < max_dev_lun; ++lun)
1263 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
1264 NULL) != SCSI_SCAN_LUN_PRESENT) &&
1265 !sparse_lun)
1266 return;
1267}
1268
1269/**
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001270 * scsilun_to_int - convert a scsi_lun to an int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271 * @scsilun: struct scsi_lun to be converted.
1272 *
1273 * Description:
1274 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1275 * integer, and return the result. The caller must check for
1276 * truncation before using this function.
1277 *
1278 * Notes:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 * For a description of the LUN format, post SCSI-3 see the SCSI
1280 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1281 *
Hannes Reinecked9e5d612014-06-25 15:27:39 +02001282 * Given a struct scsi_lun of: d2 04 0b 03 00 00 00 00, this function
1283 * returns the integer: 0x0b03d204
1284 *
1285 * This encoding will return a standard integer LUN for LUNs smaller
1286 * than 256, which typically use a single level LUN structure with
1287 * addressing method 0.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 **/
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001289u64 scsilun_to_int(struct scsi_lun *scsilun)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290{
1291 int i;
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001292 u64 lun;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293
1294 lun = 0;
1295 for (i = 0; i < sizeof(lun); i += 2)
Hannes Reinecked9e5d612014-06-25 15:27:39 +02001296 lun = lun | (((u64)scsilun->scsi_lun[i] << ((i + 1) * 8)) |
1297 ((u64)scsilun->scsi_lun[i + 1] << (i * 8)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298 return lun;
1299}
Christof Schmitt462b7852007-06-19 10:25:30 +02001300EXPORT_SYMBOL(scsilun_to_int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301
1302/**
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001303 * int_to_scsilun - reverts an int into a scsi_lun
Rob Landleyeb448202007-11-03 13:30:39 -05001304 * @lun: integer to be reverted
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001305 * @scsilun: struct scsi_lun to be set.
1306 *
1307 * Description:
1308 * Reverts the functionality of the scsilun_to_int, which packed
1309 * an 8-byte lun value into an int. This routine unpacks the int
1310 * back into the lun value.
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001311 *
1312 * Notes:
Hannes Reinecked9e5d612014-06-25 15:27:39 +02001313 * Given an integer : 0x0b03d204, this function returns a
1314 * struct scsi_lun of: d2 04 0b 03 00 00 00 00
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001315 *
1316 **/
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001317void int_to_scsilun(u64 lun, struct scsi_lun *scsilun)
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001318{
1319 int i;
1320
1321 memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
1322
1323 for (i = 0; i < sizeof(lun); i += 2) {
1324 scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
1325 scsilun->scsi_lun[i+1] = lun & 0xFF;
1326 lun = lun >> 16;
1327 }
1328}
1329EXPORT_SYMBOL(int_to_scsilun);
1330
1331/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
Rob Landleyeb448202007-11-03 13:30:39 -05001333 * @starget: which target
1334 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1335 * @rescan: nonzero if we can skip code only needed on first scan
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 *
1337 * Description:
Rob Landleyeb448202007-11-03 13:30:39 -05001338 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1339 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 *
Rob Landleyeb448202007-11-03 13:30:39 -05001341 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1342 * LUNs even if it's older than SCSI-3.
1343 * If BLIST_NOREPORTLUN is set, return 1 always.
1344 * If BLIST_NOLUN is set, return 0 always.
Alan Stern09b6b512012-01-10 13:43:30 -05001345 * If starget->no_report_luns is set, return 1 always.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346 *
1347 * Return:
1348 * 0: scan completed (or no memory, so further scanning is futile)
Rob Landleyeb448202007-11-03 13:30:39 -05001349 * 1: could not scan with REPORT LUN
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 **/
James Bottomley6f3a2022005-09-22 20:33:28 -05001351static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352 int rescan)
1353{
1354 char devname[64];
1355 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1356 unsigned int length;
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001357 u64 lun;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 unsigned int num_luns;
1359 unsigned int retries;
James Bottomley39216032005-06-15 18:48:29 -05001360 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 struct scsi_lun *lunp, *lun_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 u8 *data;
1363 struct scsi_sense_hdr sshdr;
James Bottomley6f3a2022005-09-22 20:33:28 -05001364 struct scsi_device *sdev;
1365 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
Alan Stern2ef89192005-11-08 15:51:55 -05001366 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367
1368 /*
1369 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1370 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1371 * support more than 8 LUNs.
Alan Stern09b6b512012-01-10 13:43:30 -05001372 * Don't attempt if the target doesn't support REPORT LUNS.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 */
James Bottomley4d7db042006-03-31 20:07:45 -06001374 if (bflags & BLIST_NOREPORTLUN)
1375 return 1;
1376 if (starget->scsi_level < SCSI_2 &&
1377 starget->scsi_level != SCSI_UNKNOWN)
1378 return 1;
1379 if (starget->scsi_level < SCSI_3 &&
1380 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 return 1;
1382 if (bflags & BLIST_NOLUN)
1383 return 0;
Alan Stern09b6b512012-01-10 13:43:30 -05001384 if (starget->no_report_luns)
1385 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386
James Bottomley6f3a2022005-09-22 20:33:28 -05001387 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1388 sdev = scsi_alloc_sdev(starget, 0, NULL);
1389 if (!sdev)
1390 return 0;
Alan Stern75f8ee82010-02-12 12:13:31 -05001391 if (scsi_device_get(sdev)) {
1392 __scsi_remove_device(sdev);
James Bottomley6f3a2022005-09-22 20:33:28 -05001393 return 0;
Alan Stern75f8ee82010-02-12 12:13:31 -05001394 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001395 }
1396
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397 sprintf(devname, "host %d channel %d id %d",
James Bottomley6f3a2022005-09-22 20:33:28 -05001398 shost->host_no, sdev->channel, sdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399
1400 /*
1401 * Allocate enough to hold the header (the same size as one scsi_lun)
1402 * plus the max number of luns we are requesting.
1403 *
1404 * Reallocating and trying again (with the exact amount we need)
1405 * would be nice, but then we need to somehow limit the size
1406 * allocated based on the available memory and the limits of
1407 * kmalloc - we don't want a kmalloc() failure of a huge value to
1408 * prevent us from finding any LUNs on this target.
1409 */
1410 length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun);
1411 lun_data = kmalloc(length, GFP_ATOMIC |
1412 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
James Bottomley6f3a2022005-09-22 20:33:28 -05001413 if (!lun_data) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001414 printk(ALLOC_FAILURE_MSG, __func__);
James Bottomley39216032005-06-15 18:48:29 -05001415 goto out;
James Bottomley6f3a2022005-09-22 20:33:28 -05001416 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417
1418 scsi_cmd[0] = REPORT_LUNS;
1419
1420 /*
1421 * bytes 1 - 5: reserved, set to zero.
1422 */
1423 memset(&scsi_cmd[1], 0, 5);
1424
1425 /*
1426 * bytes 6 - 9: length of the command.
1427 */
1428 scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff;
1429 scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff;
1430 scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff;
1431 scsi_cmd[9] = (unsigned char) length & 0xff;
1432
1433 scsi_cmd[10] = 0; /* reserved */
1434 scsi_cmd[11] = 0; /* control */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435
1436 /*
1437 * We can get a UNIT ATTENTION, for example a power on/reset, so
1438 * retry a few times (like sd.c does for TEST UNIT READY).
1439 * Experience shows some combinations of adapter/devices get at
1440 * least two power on/resets.
1441 *
1442 * Illegal requests (for devices that do not support REPORT LUNS)
1443 * should come through as a check condition, and will not generate
1444 * a retry.
1445 */
1446 for (retries = 0; retries < 3; retries++) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001447 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1448 "scsi scan: Sending REPORT LUNS to (try %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449 retries));
James Bottomley39216032005-06-15 18:48:29 -05001450
James Bottomley39216032005-06-15 18:48:29 -05001451 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001452 lun_data, length, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09001453 SCSI_TIMEOUT + 4 * HZ, 3, NULL);
James Bottomley39216032005-06-15 18:48:29 -05001454
Hannes Reinecke91921e02014-06-25 16:39:59 +02001455 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1456 "scsi scan: REPORT LUNS"
1457 " %s (try %d) result 0x%x\n",
1458 result ? "failed" : "successful",
1459 retries, result));
James Bottomley39216032005-06-15 18:48:29 -05001460 if (result == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 break;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001462 else if (scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463 if (sshdr.sense_key != UNIT_ATTENTION)
1464 break;
1465 }
1466 }
1467
James Bottomley39216032005-06-15 18:48:29 -05001468 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469 /*
1470 * The device probably does not support a REPORT LUN command
1471 */
Alan Stern2ef89192005-11-08 15:51:55 -05001472 ret = 1;
1473 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475
1476 /*
1477 * Get the length from the first four bytes of lun_data.
1478 */
1479 data = (u8 *) lun_data->scsi_lun;
1480 length = ((data[0] << 24) | (data[1] << 16) |
1481 (data[2] << 8) | (data[3] << 0));
1482
1483 num_luns = (length / sizeof(struct scsi_lun));
1484 if (num_luns > max_scsi_report_luns) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001485 sdev_printk(KERN_WARNING, sdev,
1486 "Only %d (max_scsi_report_luns)"
1487 " of %d luns reported, try increasing"
1488 " max_scsi_report_luns.\n",
1489 max_scsi_report_luns, num_luns);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 num_luns = max_scsi_report_luns;
1491 }
1492
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001493 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1494 "scsi scan: REPORT LUN scan\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495
1496 /*
1497 * Scan the luns in lun_data. The entry at offset 0 is really
1498 * the header, so start at 1 and go up to and including num_luns.
1499 */
1500 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1501 lun = scsilun_to_int(lunp);
1502
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001503 if (lun > sdev->host->max_lun) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001504 sdev_printk(KERN_WARNING, sdev,
1505 "lun%llu has a LUN larger than"
1506 " allowed by the host adapter\n", lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507 } else {
1508 int res;
1509
1510 res = scsi_probe_and_add_lun(starget,
1511 lun, NULL, NULL, rescan, NULL);
1512 if (res == SCSI_SCAN_NO_RESPONSE) {
1513 /*
1514 * Got some results, but now none, abort.
1515 */
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001516 sdev_printk(KERN_ERR, sdev,
1517 "Unexpected response"
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001518 " from lun %llu while scanning, scan"
1519 " aborted\n", (unsigned long long)lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520 break;
1521 }
1522 }
1523 }
1524
Alan Stern2ef89192005-11-08 15:51:55 -05001525 out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526 kfree(lun_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 out:
James Bottomley6f3a2022005-09-22 20:33:28 -05001528 scsi_device_put(sdev);
James Bottomley0f1d87a2008-08-22 16:43:59 -05001529 if (scsi_device_created(sdev))
James Bottomley6f3a2022005-09-22 20:33:28 -05001530 /*
1531 * the sdev we used didn't appear in the report luns scan
1532 */
James Bottomley860dc732009-11-19 17:48:29 -05001533 __scsi_remove_device(sdev);
Alan Stern2ef89192005-11-08 15:51:55 -05001534 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535}
1536
1537struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001538 uint id, u64 lun, void *hostdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539{
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001540 struct scsi_device *sdev = ERR_PTR(-ENODEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541 struct device *parent = &shost->shost_gendev;
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001542 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543
Matthew Wilcox938e2ac2007-01-15 18:07:09 -07001544 if (strncmp(scsi_scan_type, "none", 4) == 0)
1545 return ERR_PTR(-ENODEV);
1546
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001547 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548 if (!starget)
1549 return ERR_PTR(-ENOMEM);
Alan Sternbc4f2402010-06-17 10:41:42 -04001550 scsi_autopm_get_target(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551
Arjan van de Ven0b950672006-01-11 13:16:10 +01001552 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001553 if (!shost->async_scan)
1554 scsi_complete_async_scans();
1555
Alan Sternbc4f2402010-06-17 10:41:42 -04001556 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001557 scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
Alan Sternbc4f2402010-06-17 10:41:42 -04001558 scsi_autopm_put_host(shost);
1559 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001560 mutex_unlock(&shost->scan_mutex);
Alan Sternbc4f2402010-06-17 10:41:42 -04001561 scsi_autopm_put_target(starget);
James Bottomleye63ed0d2014-01-21 07:00:50 -08001562 /*
1563 * paired with scsi_alloc_target(). Target will be destroyed unless
1564 * scsi_probe_and_add_lun made an underlying device visible
1565 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566 scsi_target_reap(starget);
1567 put_device(&starget->dev);
1568
1569 return sdev;
1570}
1571EXPORT_SYMBOL(__scsi_add_device);
1572
James Bottomley146f7262005-09-10 12:44:09 -05001573int scsi_add_device(struct Scsi_Host *host, uint channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001574 uint target, u64 lun)
James Bottomley146f7262005-09-10 12:44:09 -05001575{
1576 struct scsi_device *sdev =
1577 __scsi_add_device(host, channel, target, lun, NULL);
1578 if (IS_ERR(sdev))
1579 return PTR_ERR(sdev);
1580
1581 scsi_device_put(sdev);
1582 return 0;
1583}
1584EXPORT_SYMBOL(scsi_add_device);
1585
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586void scsi_rescan_device(struct device *dev)
1587{
1588 struct scsi_driver *drv;
1589
1590 if (!dev->driver)
1591 return;
1592
1593 drv = to_scsi_driver(dev->driver);
1594 if (try_module_get(drv->owner)) {
1595 if (drv->rescan)
1596 drv->rescan(dev);
1597 module_put(drv->owner);
1598 }
1599}
1600EXPORT_SYMBOL(scsi_rescan_device);
1601
Alan Sterne517d312005-07-26 10:18:45 -04001602static void __scsi_scan_target(struct device *parent, unsigned int channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001603 unsigned int id, u64 lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001604{
1605 struct Scsi_Host *shost = dev_to_shost(parent);
1606 int bflags = 0;
1607 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001608 struct scsi_target *starget;
1609
1610 if (shost->this_id == id)
1611 /*
1612 * Don't scan the host adapter
1613 */
1614 return;
1615
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617 if (!starget)
1618 return;
Alan Sternbc4f2402010-06-17 10:41:42 -04001619 scsi_autopm_get_target(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621 if (lun != SCAN_WILD_CARD) {
1622 /*
1623 * Scan for a specific host/chan/id/lun.
1624 */
1625 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1626 goto out_reap;
1627 }
1628
1629 /*
1630 * Scan LUN 0, if there is some response, scan further. Ideally, we
1631 * would not configure LUN 0 until all LUNs are scanned.
1632 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001633 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1634 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1635 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001636 /*
1637 * The REPORT LUN did not scan the target,
1638 * do a sequential scan.
1639 */
1640 scsi_sequential_lun_scan(starget, bflags,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001641 starget->scsi_level, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001642 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643
1644 out_reap:
Alan Sternbc4f2402010-06-17 10:41:42 -04001645 scsi_autopm_put_target(starget);
James Bottomleye63ed0d2014-01-21 07:00:50 -08001646 /*
1647 * paired with scsi_alloc_target(): determine if the target has
1648 * any children at all and if not, nuke it
1649 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650 scsi_target_reap(starget);
1651
1652 put_device(&starget->dev);
1653}
Alan Sterne517d312005-07-26 10:18:45 -04001654
1655/**
Randy Dunlape59e4a02008-02-29 22:02:50 -08001656 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
Alan Sterne517d312005-07-26 10:18:45 -04001657 * @parent: host to scan
1658 * @channel: channel to scan
1659 * @id: target id to scan
1660 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1661 * @rescan: passed to LUN scanning routines
1662 *
1663 * Description:
1664 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1665 * and possibly all LUNs on the target id.
1666 *
1667 * First try a REPORT LUN scan, if that does not scan the target, do a
1668 * sequential scan of LUNs on the target id.
1669 **/
1670void scsi_scan_target(struct device *parent, unsigned int channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001671 unsigned int id, u64 lun, int rescan)
Alan Sterne517d312005-07-26 10:18:45 -04001672{
1673 struct Scsi_Host *shost = dev_to_shost(parent);
1674
Matthew Wilcox93b45af2006-11-22 13:24:53 -07001675 if (strncmp(scsi_scan_type, "none", 4) == 0)
1676 return;
1677
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001678 mutex_lock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001679 if (!shost->async_scan)
1680 scsi_complete_async_scans();
1681
Alan Sternbc4f2402010-06-17 10:41:42 -04001682 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Alan Sterne517d312005-07-26 10:18:45 -04001683 __scsi_scan_target(parent, channel, id, lun, rescan);
Alan Sternbc4f2402010-06-17 10:41:42 -04001684 scsi_autopm_put_host(shost);
1685 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001686 mutex_unlock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001687}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688EXPORT_SYMBOL(scsi_scan_target);
1689
1690static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001691 unsigned int id, u64 lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001692{
1693 uint order_id;
1694
1695 if (id == SCAN_WILD_CARD)
1696 for (id = 0; id < shost->max_id; ++id) {
1697 /*
1698 * XXX adapter drivers when possible (FCP, iSCSI)
1699 * could modify max_id to match the current max,
1700 * not the absolute max.
1701 *
1702 * XXX add a shost id iterator, so for example,
1703 * the FC ID can be the same as a target id
1704 * without a huge overhead of sparse id's.
1705 */
1706 if (shost->reverse_ordering)
1707 /*
1708 * Scan from high to low id.
1709 */
1710 order_id = shost->max_id - id - 1;
1711 else
1712 order_id = id;
Alan Sterne517d312005-07-26 10:18:45 -04001713 __scsi_scan_target(&shost->shost_gendev, channel,
1714 order_id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001715 }
1716 else
Alan Sterne517d312005-07-26 10:18:45 -04001717 __scsi_scan_target(&shost->shost_gendev, channel,
1718 id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001719}
1720
1721int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001722 unsigned int id, u64 lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723{
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001724 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001725 "%s: <%u:%u:%llu>\n",
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001726 __func__, channel, id, lun));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727
1728 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
Amit Arora091686d2006-05-19 16:14:50 -07001729 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1731 return -EINVAL;
1732
Arjan van de Ven0b950672006-01-11 13:16:10 +01001733 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001734 if (!shost->async_scan)
1735 scsi_complete_async_scans();
1736
Alan Sternbc4f2402010-06-17 10:41:42 -04001737 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Mike Anderson82f29462005-06-16 11:14:33 -07001738 if (channel == SCAN_WILD_CARD)
1739 for (channel = 0; channel <= shost->max_channel;
1740 channel++)
1741 scsi_scan_channel(shost, channel, id, lun,
1742 rescan);
1743 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744 scsi_scan_channel(shost, channel, id, lun, rescan);
Alan Sternbc4f2402010-06-17 10:41:42 -04001745 scsi_autopm_put_host(shost);
Mike Anderson82f29462005-06-16 11:14:33 -07001746 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001747 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748
1749 return 0;
1750}
1751
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001752static void scsi_sysfs_add_devices(struct Scsi_Host *shost)
1753{
1754 struct scsi_device *sdev;
1755 shost_for_each_device(sdev, shost) {
Dan Williams3b661a92012-06-21 23:47:28 -07001756 /* target removed before the device could be added */
1757 if (sdev->sdev_state == SDEV_DEL)
1758 continue;
Subhash Jadavani693ad5b2014-09-25 15:32:20 +03001759 /* If device is already visible, skip adding it to sysfs */
1760 if (sdev->is_visible)
1761 continue;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001762 if (!scsi_host_scan_allowed(shost) ||
1763 scsi_sysfs_add_sdev(sdev) != 0)
James Bottomley860dc732009-11-19 17:48:29 -05001764 __scsi_remove_device(sdev);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001765 }
1766}
1767
1768/**
1769 * scsi_prep_async_scan - prepare for an async scan
1770 * @shost: the host which will be scanned
1771 * Returns: a cookie to be passed to scsi_finish_async_scan()
1772 *
1773 * Tells the midlayer this host is going to do an asynchronous scan.
1774 * It reserves the host's position in the scanning list and ensures
1775 * that other asynchronous scans started after this one won't affect the
1776 * ordering of the discovered devices.
1777 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001778static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001779{
1780 struct async_scan_data *data;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001781 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001782
1783 if (strncmp(scsi_scan_type, "sync", 4) == 0)
1784 return NULL;
1785
1786 if (shost->async_scan) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001787 shost_printk(KERN_INFO, shost, "%s called twice\n", __func__);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001788 dump_stack();
1789 return NULL;
1790 }
1791
1792 data = kmalloc(sizeof(*data), GFP_KERNEL);
1793 if (!data)
1794 goto err;
1795 data->shost = scsi_host_get(shost);
1796 if (!data->shost)
1797 goto err;
1798 init_completion(&data->prev_finished);
1799
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001800 mutex_lock(&shost->scan_mutex);
1801 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001802 shost->async_scan = 1;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001803 spin_unlock_irqrestore(shost->host_lock, flags);
1804 mutex_unlock(&shost->scan_mutex);
1805
1806 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001807 if (list_empty(&scanning_hosts))
1808 complete(&data->prev_finished);
1809 list_add_tail(&data->list, &scanning_hosts);
1810 spin_unlock(&async_scan_lock);
1811
1812 return data;
1813
1814 err:
1815 kfree(data);
1816 return NULL;
1817}
1818
1819/**
1820 * scsi_finish_async_scan - asynchronous scan has finished
1821 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1822 *
1823 * All the devices currently attached to this host have been found.
1824 * This function announces all the devices it has found to the rest
1825 * of the system.
1826 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001827static void scsi_finish_async_scan(struct async_scan_data *data)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001828{
1829 struct Scsi_Host *shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001830 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001831
1832 if (!data)
1833 return;
1834
1835 shost = data->shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001836
1837 mutex_lock(&shost->scan_mutex);
1838
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001839 if (!shost->async_scan) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001840 shost_printk(KERN_INFO, shost, "%s called twice\n", __func__);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001841 dump_stack();
Julia Lawall773e82f2008-07-21 09:58:30 +02001842 mutex_unlock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001843 return;
1844 }
1845
1846 wait_for_completion(&data->prev_finished);
1847
1848 scsi_sysfs_add_devices(shost);
1849
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001850 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001851 shost->async_scan = 0;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001852 spin_unlock_irqrestore(shost->host_lock, flags);
1853
1854 mutex_unlock(&shost->scan_mutex);
1855
1856 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001857 list_del(&data->list);
1858 if (!list_empty(&scanning_hosts)) {
1859 struct async_scan_data *next = list_entry(scanning_hosts.next,
1860 struct async_scan_data, list);
1861 complete(&next->prev_finished);
1862 }
1863 spin_unlock(&async_scan_lock);
1864
Huajun Li267a6ad2012-02-12 19:59:14 +08001865 scsi_autopm_put_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001866 scsi_host_put(shost);
1867 kfree(data);
1868}
1869
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001870static void do_scsi_scan_host(struct Scsi_Host *shost)
1871{
1872 if (shost->hostt->scan_finished) {
1873 unsigned long start = jiffies;
1874 if (shost->hostt->scan_start)
1875 shost->hostt->scan_start(shost);
1876
1877 while (!shost->hostt->scan_finished(shost, jiffies - start))
1878 msleep(10);
1879 } else {
1880 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1881 SCAN_WILD_CARD, 0);
1882 }
1883}
1884
Dan Williams6cdd5522012-07-09 19:33:35 -07001885static void do_scan_async(void *_data, async_cookie_t c)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001886{
1887 struct async_scan_data *data = _data;
Alan Sternbc4f2402010-06-17 10:41:42 -04001888 struct Scsi_Host *shost = data->shost;
1889
1890 do_scsi_scan_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001891 scsi_finish_async_scan(data);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001892}
1893
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894/**
1895 * scsi_scan_host - scan the given adapter
1896 * @shost: adapter to scan
1897 **/
1898void scsi_scan_host(struct Scsi_Host *shost)
1899{
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001900 struct async_scan_data *data;
1901
1902 if (strncmp(scsi_scan_type, "none", 4) == 0)
1903 return;
Alan Sternbc4f2402010-06-17 10:41:42 -04001904 if (scsi_autopm_get_host(shost) < 0)
1905 return;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001906
1907 data = scsi_prep_async_scan(shost);
1908 if (!data) {
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001909 do_scsi_scan_host(shost);
Alan Sternbc4f2402010-06-17 10:41:42 -04001910 scsi_autopm_put_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001911 return;
1912 }
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001913
Dan Williams6cdd5522012-07-09 19:33:35 -07001914 /* register with the async subsystem so wait_for_device_probe()
1915 * will flush this work
1916 */
1917 async_schedule(do_scan_async, data);
1918
Huajun Li267a6ad2012-02-12 19:59:14 +08001919 /* scsi_autopm_put_host(shost) is called in scsi_finish_async_scan() */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001920}
1921EXPORT_SYMBOL(scsi_scan_host);
1922
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923void scsi_forget_host(struct Scsi_Host *shost)
1924{
Alan Sterna64358d2005-07-26 10:27:10 -04001925 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926 unsigned long flags;
1927
Alan Sterna64358d2005-07-26 10:27:10 -04001928 restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001929 spin_lock_irqsave(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001930 list_for_each_entry(sdev, &shost->__devices, siblings) {
1931 if (sdev->sdev_state == SDEV_DEL)
1932 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933 spin_unlock_irqrestore(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001934 __scsi_remove_device(sdev);
1935 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936 }
1937 spin_unlock_irqrestore(shost->host_lock, flags);
1938}
1939
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001940/**
1941 * scsi_get_host_dev - Create a scsi_device that points to the host adapter itself
1942 * @shost: Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001943 *
1944 * Lock status: None assumed.
1945 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001946 * Returns: The scsi_device or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001947 *
1948 * Notes:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001949 * Attach a single scsi_device to the Scsi_Host - this should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001950 * be made to look like a "pseudo-device" that points to the
1951 * HA itself.
1952 *
1953 * Note - this device is not accessible from any high-level
1954 * drivers (including generics), which is probably not
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001955 * optimal. We can add hooks later to attach.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001956 */
1957struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1958{
Alan Sterne517d312005-07-26 10:18:45 -04001959 struct scsi_device *sdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001960 struct scsi_target *starget;
1961
Arjan van de Ven0b950672006-01-11 13:16:10 +01001962 mutex_lock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001963 if (!scsi_host_scan_allowed(shost))
1964 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1966 if (!starget)
Alan Sterne517d312005-07-26 10:18:45 -04001967 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001968
1969 sdev = scsi_alloc_sdev(starget, 0, NULL);
Alan Sternd5469112010-02-12 12:13:39 -05001970 if (sdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001971 sdev->borken = 0;
Alan Sternd5469112010-02-12 12:13:39 -05001972 else
James Bottomley884d25c2006-09-05 16:26:41 -05001973 scsi_target_reap(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001974 put_device(&starget->dev);
Alan Sterne517d312005-07-26 10:18:45 -04001975 out:
Arjan van de Ven0b950672006-01-11 13:16:10 +01001976 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001977 return sdev;
1978}
1979EXPORT_SYMBOL(scsi_get_host_dev);
1980
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001981/**
1982 * scsi_free_host_dev - Free a scsi_device that points to the host adapter itself
1983 * @sdev: Host device to be freed
Linus Torvalds1da177e2005-04-16 15:20:36 -07001984 *
1985 * Lock status: None assumed.
1986 *
1987 * Returns: Nothing
Linus Torvalds1da177e2005-04-16 15:20:36 -07001988 */
1989void scsi_free_host_dev(struct scsi_device *sdev)
1990{
1991 BUG_ON(sdev->id != sdev->host->this_id);
1992
James Bottomley860dc732009-11-19 17:48:29 -05001993 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001994}
1995EXPORT_SYMBOL(scsi_free_host_dev);
1996