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1/* Driver for USB Mass Storage compliant devices
2 * SCSI layer glue code
3 *
4 * Current development and maintenance by:
5 * (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
6 *
7 * Developed with the assistance of:
8 * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)
9 * (c) 2000 Stephen J. Gowdy (SGowdy@lbl.gov)
10 *
11 * Initial work by:
12 * (c) 1999 Michael Gee (michael@linuxspecific.com)
13 *
14 * This driver is based on the 'USB Mass Storage Class' document. This
15 * describes in detail the protocol used to communicate with such
16 * devices. Clearly, the designers had SCSI and ATAPI commands in
17 * mind when they created this document. The commands are all very
18 * similar to commands in the SCSI-II and ATAPI specifications.
19 *
20 * It is important to note that in a number of cases this class
21 * exhibits class-specific exemptions from the USB specification.
22 * Notably the usage of NAK, STALL and ACK differs from the norm, in
23 * that they are used to communicate wait, failed and OK on commands.
24 *
25 * Also, for certain devices, the interrupt endpoint is used to convey
26 * status of a command.
27 *
28 * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
29 * information about this driver.
30 *
31 * This program is free software; you can redistribute it and/or modify it
32 * under the terms of the GNU General Public License as published by the
33 * Free Software Foundation; either version 2, or (at your option) any
34 * later version.
35 *
36 * This program is distributed in the hope that it will be useful, but
37 * WITHOUT ANY WARRANTY; without even the implied warranty of
38 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
39 * General Public License for more details.
40 *
41 * You should have received a copy of the GNU General Public License along
42 * with this program; if not, write to the Free Software Foundation, Inc.,
43 * 675 Mass Ave, Cambridge, MA 02139, USA.
44 */
45
46#include <linux/module.h>
47#include <linux/mutex.h>
48
49#include <scsi/scsi.h>
50#include <scsi/scsi_cmnd.h>
51#include <scsi/scsi_devinfo.h>
52#include <scsi/scsi_device.h>
53#include <scsi/scsi_eh.h>
54
55#include "usb.h"
56#include "scsiglue.h"
57#include "debug.h"
58#include "transport.h"
59#include "protocol.h"
60
61/* Vendor IDs for companies that seem to include the READ CAPACITY bug
62 * in all their devices
63 */
64#define VENDOR_ID_NOKIA 0x0421
65#define VENDOR_ID_NIKON 0x04b0
66#define VENDOR_ID_PENTAX 0x0a17
67#define VENDOR_ID_MOTOROLA 0x22b8
68
69/***********************************************************************
70 * Host functions
71 ***********************************************************************/
72
73static const char* host_info(struct Scsi_Host *host)
74{
75 struct us_data *us = host_to_us(host);
76 return us->scsi_name;
77}
78
79static int slave_alloc (struct scsi_device *sdev)
80{
81 struct us_data *us = host_to_us(sdev->host);
82
83 /*
84 * Set the INQUIRY transfer length to 36. We don't use any of
85 * the extra data and many devices choke if asked for more or
86 * less than 36 bytes.
87 */
88 sdev->inquiry_len = 36;
89
90 /* USB has unusual DMA-alignment requirements: Although the
91 * starting address of each scatter-gather element doesn't matter,
92 * the length of each element except the last must be divisible
93 * by the Bulk maxpacket value. There's currently no way to
94 * express this by block-layer constraints, so we'll cop out
95 * and simply require addresses to be aligned at 512-byte
96 * boundaries. This is okay since most block I/O involves
97 * hardware sectors that are multiples of 512 bytes in length,
98 * and since host controllers up through USB 2.0 have maxpacket
99 * values no larger than 512.
100 *
101 * But it doesn't suffice for Wireless USB, where Bulk maxpacket
102 * values can be as large as 2048. To make that work properly
103 * will require changes to the block layer.
104 */
105 blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
106
107 /*
108 * The UFI spec treates the Peripheral Qualifier bits in an
109 * INQUIRY result as reserved and requires devices to set them
110 * to 0. However the SCSI spec requires these bits to be set
111 * to 3 to indicate when a LUN is not present.
112 *
113 * Let the scanning code know if this target merely sets
114 * Peripheral Device Type to 0x1f to indicate no LUN.
115 */
116 if (us->subclass == USB_SC_UFI)
117 sdev->sdev_target->pdt_1f_for_no_lun = 1;
118
119 return 0;
120}
121
122static int slave_configure(struct scsi_device *sdev)
123{
124 struct us_data *us = host_to_us(sdev->host);
125
126 /* Many devices have trouble transferring more than 32KB at a time,
127 * while others have trouble with more than 64K. At this time we
128 * are limiting both to 32K (64 sectores).
129 */
130 if (us->fflags & (US_FL_MAX_SECTORS_64 | US_FL_MAX_SECTORS_MIN)) {
131 unsigned int max_sectors = 64;
132
133 if (us->fflags & US_FL_MAX_SECTORS_MIN)
134 max_sectors = PAGE_CACHE_SIZE >> 9;
135 if (queue_max_hw_sectors(sdev->request_queue) > max_sectors)
136 blk_queue_max_hw_sectors(sdev->request_queue,
137 max_sectors);
138 } else if (sdev->type == TYPE_TAPE) {
139 /* Tapes need much higher max_sector limits, so just
140 * raise it to the maximum possible (4 GB / 512) and
141 * let the queue segment size sort out the real limit.
142 */
143 blk_queue_max_hw_sectors(sdev->request_queue, 0x7FFFFF);
144 }
145
146 /* Some USB host controllers can't do DMA; they have to use PIO.
147 * They indicate this by setting their dma_mask to NULL. For
148 * such controllers we need to make sure the block layer sets
149 * up bounce buffers in addressable memory.
150 */
151 if (!us->pusb_dev->bus->controller->dma_mask)
152 blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_HIGH);
153
154 /* We can't put these settings in slave_alloc() because that gets
155 * called before the device type is known. Consequently these
156 * settings can't be overridden via the scsi devinfo mechanism. */
157 if (sdev->type == TYPE_DISK) {
158
159 /* Some vendors seem to put the READ CAPACITY bug into
160 * all their devices -- primarily makers of cell phones
161 * and digital cameras. Since these devices always use
162 * flash media and can be expected to have an even number
163 * of sectors, we will always enable the CAPACITY_HEURISTICS
164 * flag unless told otherwise. */
165 switch (le16_to_cpu(us->pusb_dev->descriptor.idVendor)) {
166 case VENDOR_ID_NOKIA:
167 case VENDOR_ID_NIKON:
168 case VENDOR_ID_PENTAX:
169 case VENDOR_ID_MOTOROLA:
170 if (!(us->fflags & (US_FL_FIX_CAPACITY |
171 US_FL_CAPACITY_OK)))
172 us->fflags |= US_FL_CAPACITY_HEURISTICS;
173 break;
174 }
175
176 /* Disk-type devices use MODE SENSE(6) if the protocol
177 * (SubClass) is Transparent SCSI, otherwise they use
178 * MODE SENSE(10). */
179 if (us->subclass != USB_SC_SCSI && us->subclass != USB_SC_CYP_ATACB)
180 sdev->use_10_for_ms = 1;
181
182 /* Many disks only accept MODE SENSE transfer lengths of
183 * 192 bytes (that's what Windows uses). */
184 sdev->use_192_bytes_for_3f = 1;
185
186 /* Some devices don't like MODE SENSE with page=0x3f,
187 * which is the command used for checking if a device
188 * is write-protected. Now that we tell the sd driver
189 * to do a 192-byte transfer with this command the
190 * majority of devices work fine, but a few still can't
191 * handle it. The sd driver will simply assume those
192 * devices are write-enabled. */
193 if (us->fflags & US_FL_NO_WP_DETECT)
194 sdev->skip_ms_page_3f = 1;
195
196 /* A number of devices have problems with MODE SENSE for
197 * page x08, so we will skip it. */
198 sdev->skip_ms_page_8 = 1;
199
200 /* Some disks return the total number of blocks in response
201 * to READ CAPACITY rather than the highest block number.
202 * If this device makes that mistake, tell the sd driver. */
203 if (us->fflags & US_FL_FIX_CAPACITY)
204 sdev->fix_capacity = 1;
205
206 /* A few disks have two indistinguishable version, one of
207 * which reports the correct capacity and the other does not.
208 * The sd driver has to guess which is the case. */
209 if (us->fflags & US_FL_CAPACITY_HEURISTICS)
210 sdev->guess_capacity = 1;
211
212 /* Some devices cannot handle READ_CAPACITY_16 */
213 if (us->fflags & US_FL_NO_READ_CAPACITY_16)
214 sdev->no_read_capacity_16 = 1;
215
216 /* assume SPC3 or latter devices support sense size > 18 */
217 if (sdev->scsi_level > SCSI_SPC_2)
218 us->fflags |= US_FL_SANE_SENSE;
219
220 /* Some devices report a SCSI revision level above 2 but are
221 * unable to handle the REPORT LUNS command (for which
222 * support is mandatory at level 3). Since we already have
223 * a Get-Max-LUN request, we won't lose much by setting the
224 * revision level down to 2. The only devices that would be
225 * affected are those with sparse LUNs. */
226 if (sdev->scsi_level > SCSI_2)
227 sdev->sdev_target->scsi_level =
228 sdev->scsi_level = SCSI_2;
229
230 /* USB-IDE bridges tend to report SK = 0x04 (Non-recoverable
231 * Hardware Error) when any low-level error occurs,
232 * recoverable or not. Setting this flag tells the SCSI
233 * midlayer to retry such commands, which frequently will
234 * succeed and fix the error. The worst this can lead to
235 * is an occasional series of retries that will all fail. */
236 sdev->retry_hwerror = 1;
237
238 /* USB disks should allow restart. Some drives spin down
239 * automatically, requiring a START-STOP UNIT command. */
240 sdev->allow_restart = 1;
241
242 /* Some USB cardreaders have trouble reading an sdcard's last
243 * sector in a larger then 1 sector read, since the performance
244 * impact is negible we set this flag for all USB disks */
245 sdev->last_sector_bug = 1;
246
247 /* Enable last-sector hacks for single-target devices using
248 * the Bulk-only transport, unless we already know the
249 * capacity will be decremented or is correct. */
250 if (!(us->fflags & (US_FL_FIX_CAPACITY | US_FL_CAPACITY_OK |
251 US_FL_SCM_MULT_TARG)) &&
252 us->protocol == USB_PR_BULK)
253 us->use_last_sector_hacks = 1;
254 } else {
255
256 /* Non-disk-type devices don't need to blacklist any pages
257 * or to force 192-byte transfer lengths for MODE SENSE.
258 * But they do need to use MODE SENSE(10). */
259 sdev->use_10_for_ms = 1;
260
261 /* Some (fake) usb cdrom devices don't like READ_DISC_INFO */
262 if (us->fflags & US_FL_NO_READ_DISC_INFO)
263 sdev->no_read_disc_info = 1;
264 }
265
266 /* The CB and CBI transports have no way to pass LUN values
267 * other than the bits in the second byte of a CDB. But those
268 * bits don't get set to the LUN value if the device reports
269 * scsi_level == 0 (UNKNOWN). Hence such devices must necessarily
270 * be single-LUN.
271 */
272 if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_CBI) &&
273 sdev->scsi_level == SCSI_UNKNOWN)
274 us->max_lun = 0;
275
276 /* Some devices choke when they receive a PREVENT-ALLOW MEDIUM
277 * REMOVAL command, so suppress those commands. */
278 if (us->fflags & US_FL_NOT_LOCKABLE)
279 sdev->lockable = 0;
280
281 /* this is to satisfy the compiler, tho I don't think the
282 * return code is ever checked anywhere. */
283 return 0;
284}
285
286/* queue a command */
287/* This is always called with scsi_lock(host) held */
288static int queuecommand_lck(struct scsi_cmnd *srb,
289 void (*done)(struct scsi_cmnd *))
290{
291 struct us_data *us = host_to_us(srb->device->host);
292
293 US_DEBUGP("%s called\n", __func__);
294
295 /* check for state-transition errors */
296 if (us->srb != NULL) {
297 printk(KERN_ERR USB_STORAGE "Error in %s: us->srb = %p\n",
298 __func__, us->srb);
299 return SCSI_MLQUEUE_HOST_BUSY;
300 }
301
302 /* fail the command if we are disconnecting */
303 if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) {
304 US_DEBUGP("Fail command during disconnect\n");
305 srb->result = DID_NO_CONNECT << 16;
306 done(srb);
307 return 0;
308 }
309
310 /* enqueue the command and wake up the control thread */
311 srb->scsi_done = done;
312 us->srb = srb;
313 complete(&us->cmnd_ready);
314
315 return 0;
316}
317
318static DEF_SCSI_QCMD(queuecommand)
319
320/***********************************************************************
321 * Error handling functions
322 ***********************************************************************/
323
324/* Command timeout and abort */
325static int command_abort(struct scsi_cmnd *srb)
326{
327 struct us_data *us = host_to_us(srb->device->host);
328
329 US_DEBUGP("%s called\n", __func__);
330
331 /* us->srb together with the TIMED_OUT, RESETTING, and ABORTING
332 * bits are protected by the host lock. */
333 scsi_lock(us_to_host(us));
334
335 /* Is this command still active? */
336 if (us->srb != srb) {
337 scsi_unlock(us_to_host(us));
338 US_DEBUGP ("-- nothing to abort\n");
339 return FAILED;
340 }
341
342 /* Set the TIMED_OUT bit. Also set the ABORTING bit, but only if
343 * a device reset isn't already in progress (to avoid interfering
344 * with the reset). Note that we must retain the host lock while
345 * calling usb_stor_stop_transport(); otherwise it might interfere
346 * with an auto-reset that begins as soon as we release the lock. */
347 set_bit(US_FLIDX_TIMED_OUT, &us->dflags);
348 if (!test_bit(US_FLIDX_RESETTING, &us->dflags)) {
349 set_bit(US_FLIDX_ABORTING, &us->dflags);
350 usb_stor_stop_transport(us);
351 }
352 scsi_unlock(us_to_host(us));
353
354 /* Wait for the aborted command to finish */
355 wait_for_completion(&us->notify);
356 return SUCCESS;
357}
358
359/* This invokes the transport reset mechanism to reset the state of the
360 * device */
361static int device_reset(struct scsi_cmnd *srb)
362{
363 struct us_data *us = host_to_us(srb->device->host);
364 int result;
365
366 US_DEBUGP("%s called\n", __func__);
367
368 /* lock the device pointers and do the reset */
369 mutex_lock(&(us->dev_mutex));
370 result = us->transport_reset(us);
371 mutex_unlock(&us->dev_mutex);
372
373 return result < 0 ? FAILED : SUCCESS;
374}
375
376/* Simulate a SCSI bus reset by resetting the device's USB port. */
377static int bus_reset(struct scsi_cmnd *srb)
378{
379 struct us_data *us = host_to_us(srb->device->host);
380 int result;
381
382 US_DEBUGP("%s called\n", __func__);
383 result = usb_stor_port_reset(us);
384 return result < 0 ? FAILED : SUCCESS;
385}
386
387/* Report a driver-initiated device reset to the SCSI layer.
388 * Calling this for a SCSI-initiated reset is unnecessary but harmless.
389 * The caller must own the SCSI host lock. */
390void usb_stor_report_device_reset(struct us_data *us)
391{
392 int i;
393 struct Scsi_Host *host = us_to_host(us);
394
395 scsi_report_device_reset(host, 0, 0);
396 if (us->fflags & US_FL_SCM_MULT_TARG) {
397 for (i = 1; i < host->max_id; ++i)
398 scsi_report_device_reset(host, 0, i);
399 }
400}
401
402/* Report a driver-initiated bus reset to the SCSI layer.
403 * Calling this for a SCSI-initiated reset is unnecessary but harmless.
404 * The caller must not own the SCSI host lock. */
405void usb_stor_report_bus_reset(struct us_data *us)
406{
407 struct Scsi_Host *host = us_to_host(us);
408
409 scsi_lock(host);
410 scsi_report_bus_reset(host, 0);
411 scsi_unlock(host);
412}
413
414/***********************************************************************
415 * /proc/scsi/ functions
416 ***********************************************************************/
417
418/* we use this macro to help us write into the buffer */
419#undef SPRINTF
420#define SPRINTF(args...) \
421 do { if (pos < buffer+length) pos += sprintf(pos, ## args); } while (0)
422
423static int proc_info (struct Scsi_Host *host, char *buffer,
424 char **start, off_t offset, int length, int inout)
425{
426 struct us_data *us = host_to_us(host);
427 char *pos = buffer;
428 const char *string;
429
430 /* if someone is sending us data, just throw it away */
431 if (inout)
432 return length;
433
434 /* print the controller name */
435 SPRINTF(" Host scsi%d: usb-storage\n", host->host_no);
436
437 /* print product, vendor, and serial number strings */
438 if (us->pusb_dev->manufacturer)
439 string = us->pusb_dev->manufacturer;
440 else if (us->unusual_dev->vendorName)
441 string = us->unusual_dev->vendorName;
442 else
443 string = "Unknown";
444 SPRINTF(" Vendor: %s\n", string);
445 if (us->pusb_dev->product)
446 string = us->pusb_dev->product;
447 else if (us->unusual_dev->productName)
448 string = us->unusual_dev->productName;
449 else
450 string = "Unknown";
451 SPRINTF(" Product: %s\n", string);
452 if (us->pusb_dev->serial)
453 string = us->pusb_dev->serial;
454 else
455 string = "None";
456 SPRINTF("Serial Number: %s\n", string);
457
458 /* show the protocol and transport */
459 SPRINTF(" Protocol: %s\n", us->protocol_name);
460 SPRINTF(" Transport: %s\n", us->transport_name);
461
462 /* show the device flags */
463 if (pos < buffer + length) {
464 pos += sprintf(pos, " Quirks:");
465
466#define US_FLAG(name, value) \
467 if (us->fflags & value) pos += sprintf(pos, " " #name);
468US_DO_ALL_FLAGS
469#undef US_FLAG
470
471 *(pos++) = '\n';
472 }
473
474 /*
475 * Calculate start of next buffer, and return value.
476 */
477 *start = buffer + offset;
478
479 if ((pos - buffer) < offset)
480 return (0);
481 else if ((pos - buffer - offset) < length)
482 return (pos - buffer - offset);
483 else
484 return (length);
485}
486
487/***********************************************************************
488 * Sysfs interface
489 ***********************************************************************/
490
491/* Output routine for the sysfs max_sectors file */
492static ssize_t show_max_sectors(struct device *dev, struct device_attribute *attr, char *buf)
493{
494 struct scsi_device *sdev = to_scsi_device(dev);
495
496 return sprintf(buf, "%u\n", queue_max_hw_sectors(sdev->request_queue));
497}
498
499/* Input routine for the sysfs max_sectors file */
500static ssize_t store_max_sectors(struct device *dev, struct device_attribute *attr, const char *buf,
501 size_t count)
502{
503 struct scsi_device *sdev = to_scsi_device(dev);
504 unsigned short ms;
505
506 if (sscanf(buf, "%hu", &ms) > 0) {
507 blk_queue_max_hw_sectors(sdev->request_queue, ms);
508 return count;
509 }
510 return -EINVAL;
511}
512
513static DEVICE_ATTR(max_sectors, S_IRUGO | S_IWUSR, show_max_sectors,
514 store_max_sectors);
515
516static struct device_attribute *sysfs_device_attr_list[] = {
517 &dev_attr_max_sectors,
518 NULL,
519 };
520
521/*
522 * this defines our host template, with which we'll allocate hosts
523 */
524
525struct scsi_host_template usb_stor_host_template = {
526 /* basic userland interface stuff */
527 .name = "usb-storage",
528 .proc_name = "usb-storage",
529 .proc_info = proc_info,
530 .info = host_info,
531
532 /* command interface -- queued only */
533 .queuecommand = queuecommand,
534
535 /* error and abort handlers */
536 .eh_abort_handler = command_abort,
537 .eh_device_reset_handler = device_reset,
538 .eh_bus_reset_handler = bus_reset,
539
540 /* queue commands only, only one command per LUN */
541 .can_queue = 1,
542 .cmd_per_lun = 1,
543
544 /* unknown initiator id */
545 .this_id = -1,
546
547 .slave_alloc = slave_alloc,
548 .slave_configure = slave_configure,
549
550 /* lots of sg segments can be handled */
551 .sg_tablesize = SCSI_MAX_SG_CHAIN_SEGMENTS,
552
553 /* limit the total size of a transfer to 120 KB */
554 .max_sectors = 240,
555
556 /* merge commands... this seems to help performance, but
557 * periodically someone should test to see which setting is more
558 * optimal.
559 */
560 .use_clustering = 1,
561
562 /* emulated HBA */
563 .emulated = 1,
564
565 /* we do our own delay after a device or bus reset */
566 .skip_settle_delay = 1,
567
568 /* sysfs device attributes */
569 .sdev_attrs = sysfs_device_attr_list,
570
571 /* module management */
572 .module = THIS_MODULE
573};
574
575/* To Report "Illegal Request: Invalid Field in CDB */
576unsigned char usb_stor_sense_invalidCDB[18] = {
577 [0] = 0x70, /* current error */
578 [2] = ILLEGAL_REQUEST, /* Illegal Request = 0x05 */
579 [7] = 0x0a, /* additional length */
580 [12] = 0x24 /* Invalid Field in CDB */
581};
582EXPORT_SYMBOL_GPL(usb_stor_sense_invalidCDB);
1/* Driver for USB Mass Storage compliant devices
2 * SCSI layer glue code
3 *
4 * Current development and maintenance by:
5 * (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
6 *
7 * Developed with the assistance of:
8 * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)
9 * (c) 2000 Stephen J. Gowdy (SGowdy@lbl.gov)
10 *
11 * Initial work by:
12 * (c) 1999 Michael Gee (michael@linuxspecific.com)
13 *
14 * This driver is based on the 'USB Mass Storage Class' document. This
15 * describes in detail the protocol used to communicate with such
16 * devices. Clearly, the designers had SCSI and ATAPI commands in
17 * mind when they created this document. The commands are all very
18 * similar to commands in the SCSI-II and ATAPI specifications.
19 *
20 * It is important to note that in a number of cases this class
21 * exhibits class-specific exemptions from the USB specification.
22 * Notably the usage of NAK, STALL and ACK differs from the norm, in
23 * that they are used to communicate wait, failed and OK on commands.
24 *
25 * Also, for certain devices, the interrupt endpoint is used to convey
26 * status of a command.
27 *
28 * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
29 * information about this driver.
30 *
31 * This program is free software; you can redistribute it and/or modify it
32 * under the terms of the GNU General Public License as published by the
33 * Free Software Foundation; either version 2, or (at your option) any
34 * later version.
35 *
36 * This program is distributed in the hope that it will be useful, but
37 * WITHOUT ANY WARRANTY; without even the implied warranty of
38 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
39 * General Public License for more details.
40 *
41 * You should have received a copy of the GNU General Public License along
42 * with this program; if not, write to the Free Software Foundation, Inc.,
43 * 675 Mass Ave, Cambridge, MA 02139, USA.
44 */
45
46#include <linux/module.h>
47#include <linux/mutex.h>
48
49#include <scsi/scsi.h>
50#include <scsi/scsi_cmnd.h>
51#include <scsi/scsi_devinfo.h>
52#include <scsi/scsi_device.h>
53#include <scsi/scsi_eh.h>
54
55#include "usb.h"
56#include "scsiglue.h"
57#include "debug.h"
58#include "transport.h"
59#include "protocol.h"
60
61/* Vendor IDs for companies that seem to include the READ CAPACITY bug
62 * in all their devices
63 */
64#define VENDOR_ID_NOKIA 0x0421
65#define VENDOR_ID_NIKON 0x04b0
66#define VENDOR_ID_PENTAX 0x0a17
67#define VENDOR_ID_MOTOROLA 0x22b8
68
69/***********************************************************************
70 * Host functions
71 ***********************************************************************/
72
73static const char* host_info(struct Scsi_Host *host)
74{
75 struct us_data *us = host_to_us(host);
76 return us->scsi_name;
77}
78
79static int slave_alloc (struct scsi_device *sdev)
80{
81 /*
82 * Set the INQUIRY transfer length to 36. We don't use any of
83 * the extra data and many devices choke if asked for more or
84 * less than 36 bytes.
85 */
86 sdev->inquiry_len = 36;
87
88 /* USB has unusual DMA-alignment requirements: Although the
89 * starting address of each scatter-gather element doesn't matter,
90 * the length of each element except the last must be divisible
91 * by the Bulk maxpacket value. There's currently no way to
92 * express this by block-layer constraints, so we'll cop out
93 * and simply require addresses to be aligned at 512-byte
94 * boundaries. This is okay since most block I/O involves
95 * hardware sectors that are multiples of 512 bytes in length,
96 * and since host controllers up through USB 2.0 have maxpacket
97 * values no larger than 512.
98 *
99 * But it doesn't suffice for Wireless USB, where Bulk maxpacket
100 * values can be as large as 2048. To make that work properly
101 * will require changes to the block layer.
102 */
103 blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
104
105 return 0;
106}
107
108static int slave_configure(struct scsi_device *sdev)
109{
110 struct us_data *us = host_to_us(sdev->host);
111
112 /* Many devices have trouble transferring more than 32KB at a time,
113 * while others have trouble with more than 64K. At this time we
114 * are limiting both to 32K (64 sectores).
115 */
116 if (us->fflags & (US_FL_MAX_SECTORS_64 | US_FL_MAX_SECTORS_MIN)) {
117 unsigned int max_sectors = 64;
118
119 if (us->fflags & US_FL_MAX_SECTORS_MIN)
120 max_sectors = PAGE_CACHE_SIZE >> 9;
121 if (queue_max_hw_sectors(sdev->request_queue) > max_sectors)
122 blk_queue_max_hw_sectors(sdev->request_queue,
123 max_sectors);
124 } else if (sdev->type == TYPE_TAPE) {
125 /* Tapes need much higher max_sector limits, so just
126 * raise it to the maximum possible (4 GB / 512) and
127 * let the queue segment size sort out the real limit.
128 */
129 blk_queue_max_hw_sectors(sdev->request_queue, 0x7FFFFF);
130 }
131
132 /* Some USB host controllers can't do DMA; they have to use PIO.
133 * They indicate this by setting their dma_mask to NULL. For
134 * such controllers we need to make sure the block layer sets
135 * up bounce buffers in addressable memory.
136 */
137 if (!us->pusb_dev->bus->controller->dma_mask)
138 blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_HIGH);
139
140 /* We can't put these settings in slave_alloc() because that gets
141 * called before the device type is known. Consequently these
142 * settings can't be overridden via the scsi devinfo mechanism. */
143 if (sdev->type == TYPE_DISK) {
144
145 /* Some vendors seem to put the READ CAPACITY bug into
146 * all their devices -- primarily makers of cell phones
147 * and digital cameras. Since these devices always use
148 * flash media and can be expected to have an even number
149 * of sectors, we will always enable the CAPACITY_HEURISTICS
150 * flag unless told otherwise. */
151 switch (le16_to_cpu(us->pusb_dev->descriptor.idVendor)) {
152 case VENDOR_ID_NOKIA:
153 case VENDOR_ID_NIKON:
154 case VENDOR_ID_PENTAX:
155 case VENDOR_ID_MOTOROLA:
156 if (!(us->fflags & (US_FL_FIX_CAPACITY |
157 US_FL_CAPACITY_OK)))
158 us->fflags |= US_FL_CAPACITY_HEURISTICS;
159 break;
160 }
161
162 /* Disk-type devices use MODE SENSE(6) if the protocol
163 * (SubClass) is Transparent SCSI, otherwise they use
164 * MODE SENSE(10). */
165 if (us->subclass != USB_SC_SCSI && us->subclass != USB_SC_CYP_ATACB)
166 sdev->use_10_for_ms = 1;
167
168 /* Many disks only accept MODE SENSE transfer lengths of
169 * 192 bytes (that's what Windows uses). */
170 sdev->use_192_bytes_for_3f = 1;
171
172 /* Some devices don't like MODE SENSE with page=0x3f,
173 * which is the command used for checking if a device
174 * is write-protected. Now that we tell the sd driver
175 * to do a 192-byte transfer with this command the
176 * majority of devices work fine, but a few still can't
177 * handle it. The sd driver will simply assume those
178 * devices are write-enabled. */
179 if (us->fflags & US_FL_NO_WP_DETECT)
180 sdev->skip_ms_page_3f = 1;
181
182 /* A number of devices have problems with MODE SENSE for
183 * page x08, so we will skip it. */
184 sdev->skip_ms_page_8 = 1;
185
186 /* Some devices don't handle VPD pages correctly */
187 sdev->skip_vpd_pages = 1;
188
189 /* Some disks return the total number of blocks in response
190 * to READ CAPACITY rather than the highest block number.
191 * If this device makes that mistake, tell the sd driver. */
192 if (us->fflags & US_FL_FIX_CAPACITY)
193 sdev->fix_capacity = 1;
194
195 /* A few disks have two indistinguishable version, one of
196 * which reports the correct capacity and the other does not.
197 * The sd driver has to guess which is the case. */
198 if (us->fflags & US_FL_CAPACITY_HEURISTICS)
199 sdev->guess_capacity = 1;
200
201 /* Some devices cannot handle READ_CAPACITY_16 */
202 if (us->fflags & US_FL_NO_READ_CAPACITY_16)
203 sdev->no_read_capacity_16 = 1;
204
205 /*
206 * Many devices do not respond properly to READ_CAPACITY_16.
207 * Tell the SCSI layer to try READ_CAPACITY_10 first.
208 */
209 sdev->try_rc_10_first = 1;
210
211 /* assume SPC3 or latter devices support sense size > 18 */
212 if (sdev->scsi_level > SCSI_SPC_2)
213 us->fflags |= US_FL_SANE_SENSE;
214
215 /* USB-IDE bridges tend to report SK = 0x04 (Non-recoverable
216 * Hardware Error) when any low-level error occurs,
217 * recoverable or not. Setting this flag tells the SCSI
218 * midlayer to retry such commands, which frequently will
219 * succeed and fix the error. The worst this can lead to
220 * is an occasional series of retries that will all fail. */
221 sdev->retry_hwerror = 1;
222
223 /* USB disks should allow restart. Some drives spin down
224 * automatically, requiring a START-STOP UNIT command. */
225 sdev->allow_restart = 1;
226
227 /* Some USB cardreaders have trouble reading an sdcard's last
228 * sector in a larger then 1 sector read, since the performance
229 * impact is negible we set this flag for all USB disks */
230 sdev->last_sector_bug = 1;
231
232 /* Enable last-sector hacks for single-target devices using
233 * the Bulk-only transport, unless we already know the
234 * capacity will be decremented or is correct. */
235 if (!(us->fflags & (US_FL_FIX_CAPACITY | US_FL_CAPACITY_OK |
236 US_FL_SCM_MULT_TARG)) &&
237 us->protocol == USB_PR_BULK)
238 us->use_last_sector_hacks = 1;
239 } else {
240
241 /* Non-disk-type devices don't need to blacklist any pages
242 * or to force 192-byte transfer lengths for MODE SENSE.
243 * But they do need to use MODE SENSE(10). */
244 sdev->use_10_for_ms = 1;
245
246 /* Some (fake) usb cdrom devices don't like READ_DISC_INFO */
247 if (us->fflags & US_FL_NO_READ_DISC_INFO)
248 sdev->no_read_disc_info = 1;
249 }
250
251 /* The CB and CBI transports have no way to pass LUN values
252 * other than the bits in the second byte of a CDB. But those
253 * bits don't get set to the LUN value if the device reports
254 * scsi_level == 0 (UNKNOWN). Hence such devices must necessarily
255 * be single-LUN.
256 */
257 if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_CBI) &&
258 sdev->scsi_level == SCSI_UNKNOWN)
259 us->max_lun = 0;
260
261 /* Some devices choke when they receive a PREVENT-ALLOW MEDIUM
262 * REMOVAL command, so suppress those commands. */
263 if (us->fflags & US_FL_NOT_LOCKABLE)
264 sdev->lockable = 0;
265
266 /* this is to satisfy the compiler, tho I don't think the
267 * return code is ever checked anywhere. */
268 return 0;
269}
270
271static int target_alloc(struct scsi_target *starget)
272{
273 struct us_data *us = host_to_us(dev_to_shost(starget->dev.parent));
274
275 /*
276 * Some USB drives don't support REPORT LUNS, even though they
277 * report a SCSI revision level above 2. Tell the SCSI layer
278 * not to issue that command; it will perform a normal sequential
279 * scan instead.
280 */
281 starget->no_report_luns = 1;
282
283 /*
284 * The UFI spec treats the Peripheral Qualifier bits in an
285 * INQUIRY result as reserved and requires devices to set them
286 * to 0. However the SCSI spec requires these bits to be set
287 * to 3 to indicate when a LUN is not present.
288 *
289 * Let the scanning code know if this target merely sets
290 * Peripheral Device Type to 0x1f to indicate no LUN.
291 */
292 if (us->subclass == USB_SC_UFI)
293 starget->pdt_1f_for_no_lun = 1;
294
295 return 0;
296}
297
298/* queue a command */
299/* This is always called with scsi_lock(host) held */
300static int queuecommand_lck(struct scsi_cmnd *srb,
301 void (*done)(struct scsi_cmnd *))
302{
303 struct us_data *us = host_to_us(srb->device->host);
304
305 US_DEBUGP("%s called\n", __func__);
306
307 /* check for state-transition errors */
308 if (us->srb != NULL) {
309 printk(KERN_ERR USB_STORAGE "Error in %s: us->srb = %p\n",
310 __func__, us->srb);
311 return SCSI_MLQUEUE_HOST_BUSY;
312 }
313
314 /* fail the command if we are disconnecting */
315 if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) {
316 US_DEBUGP("Fail command during disconnect\n");
317 srb->result = DID_NO_CONNECT << 16;
318 done(srb);
319 return 0;
320 }
321
322 /* enqueue the command and wake up the control thread */
323 srb->scsi_done = done;
324 us->srb = srb;
325 complete(&us->cmnd_ready);
326
327 return 0;
328}
329
330static DEF_SCSI_QCMD(queuecommand)
331
332/***********************************************************************
333 * Error handling functions
334 ***********************************************************************/
335
336/* Command timeout and abort */
337static int command_abort(struct scsi_cmnd *srb)
338{
339 struct us_data *us = host_to_us(srb->device->host);
340
341 US_DEBUGP("%s called\n", __func__);
342
343 /* us->srb together with the TIMED_OUT, RESETTING, and ABORTING
344 * bits are protected by the host lock. */
345 scsi_lock(us_to_host(us));
346
347 /* Is this command still active? */
348 if (us->srb != srb) {
349 scsi_unlock(us_to_host(us));
350 US_DEBUGP ("-- nothing to abort\n");
351 return FAILED;
352 }
353
354 /* Set the TIMED_OUT bit. Also set the ABORTING bit, but only if
355 * a device reset isn't already in progress (to avoid interfering
356 * with the reset). Note that we must retain the host lock while
357 * calling usb_stor_stop_transport(); otherwise it might interfere
358 * with an auto-reset that begins as soon as we release the lock. */
359 set_bit(US_FLIDX_TIMED_OUT, &us->dflags);
360 if (!test_bit(US_FLIDX_RESETTING, &us->dflags)) {
361 set_bit(US_FLIDX_ABORTING, &us->dflags);
362 usb_stor_stop_transport(us);
363 }
364 scsi_unlock(us_to_host(us));
365
366 /* Wait for the aborted command to finish */
367 wait_for_completion(&us->notify);
368 return SUCCESS;
369}
370
371/* This invokes the transport reset mechanism to reset the state of the
372 * device */
373static int device_reset(struct scsi_cmnd *srb)
374{
375 struct us_data *us = host_to_us(srb->device->host);
376 int result;
377
378 US_DEBUGP("%s called\n", __func__);
379
380 /* lock the device pointers and do the reset */
381 mutex_lock(&(us->dev_mutex));
382 result = us->transport_reset(us);
383 mutex_unlock(&us->dev_mutex);
384
385 return result < 0 ? FAILED : SUCCESS;
386}
387
388/* Simulate a SCSI bus reset by resetting the device's USB port. */
389static int bus_reset(struct scsi_cmnd *srb)
390{
391 struct us_data *us = host_to_us(srb->device->host);
392 int result;
393
394 US_DEBUGP("%s called\n", __func__);
395 result = usb_stor_port_reset(us);
396 return result < 0 ? FAILED : SUCCESS;
397}
398
399/* Report a driver-initiated device reset to the SCSI layer.
400 * Calling this for a SCSI-initiated reset is unnecessary but harmless.
401 * The caller must own the SCSI host lock. */
402void usb_stor_report_device_reset(struct us_data *us)
403{
404 int i;
405 struct Scsi_Host *host = us_to_host(us);
406
407 scsi_report_device_reset(host, 0, 0);
408 if (us->fflags & US_FL_SCM_MULT_TARG) {
409 for (i = 1; i < host->max_id; ++i)
410 scsi_report_device_reset(host, 0, i);
411 }
412}
413
414/* Report a driver-initiated bus reset to the SCSI layer.
415 * Calling this for a SCSI-initiated reset is unnecessary but harmless.
416 * The caller must not own the SCSI host lock. */
417void usb_stor_report_bus_reset(struct us_data *us)
418{
419 struct Scsi_Host *host = us_to_host(us);
420
421 scsi_lock(host);
422 scsi_report_bus_reset(host, 0);
423 scsi_unlock(host);
424}
425
426/***********************************************************************
427 * /proc/scsi/ functions
428 ***********************************************************************/
429
430/* we use this macro to help us write into the buffer */
431#undef SPRINTF
432#define SPRINTF(args...) \
433 do { if (pos < buffer+length) pos += sprintf(pos, ## args); } while (0)
434
435static int proc_info (struct Scsi_Host *host, char *buffer,
436 char **start, off_t offset, int length, int inout)
437{
438 struct us_data *us = host_to_us(host);
439 char *pos = buffer;
440 const char *string;
441
442 /* if someone is sending us data, just throw it away */
443 if (inout)
444 return length;
445
446 /* print the controller name */
447 SPRINTF(" Host scsi%d: usb-storage\n", host->host_no);
448
449 /* print product, vendor, and serial number strings */
450 if (us->pusb_dev->manufacturer)
451 string = us->pusb_dev->manufacturer;
452 else if (us->unusual_dev->vendorName)
453 string = us->unusual_dev->vendorName;
454 else
455 string = "Unknown";
456 SPRINTF(" Vendor: %s\n", string);
457 if (us->pusb_dev->product)
458 string = us->pusb_dev->product;
459 else if (us->unusual_dev->productName)
460 string = us->unusual_dev->productName;
461 else
462 string = "Unknown";
463 SPRINTF(" Product: %s\n", string);
464 if (us->pusb_dev->serial)
465 string = us->pusb_dev->serial;
466 else
467 string = "None";
468 SPRINTF("Serial Number: %s\n", string);
469
470 /* show the protocol and transport */
471 SPRINTF(" Protocol: %s\n", us->protocol_name);
472 SPRINTF(" Transport: %s\n", us->transport_name);
473
474 /* show the device flags */
475 if (pos < buffer + length) {
476 pos += sprintf(pos, " Quirks:");
477
478#define US_FLAG(name, value) \
479 if (us->fflags & value) pos += sprintf(pos, " " #name);
480US_DO_ALL_FLAGS
481#undef US_FLAG
482
483 *(pos++) = '\n';
484 }
485
486 /*
487 * Calculate start of next buffer, and return value.
488 */
489 *start = buffer + offset;
490
491 if ((pos - buffer) < offset)
492 return (0);
493 else if ((pos - buffer - offset) < length)
494 return (pos - buffer - offset);
495 else
496 return (length);
497}
498
499/***********************************************************************
500 * Sysfs interface
501 ***********************************************************************/
502
503/* Output routine for the sysfs max_sectors file */
504static ssize_t show_max_sectors(struct device *dev, struct device_attribute *attr, char *buf)
505{
506 struct scsi_device *sdev = to_scsi_device(dev);
507
508 return sprintf(buf, "%u\n", queue_max_hw_sectors(sdev->request_queue));
509}
510
511/* Input routine for the sysfs max_sectors file */
512static ssize_t store_max_sectors(struct device *dev, struct device_attribute *attr, const char *buf,
513 size_t count)
514{
515 struct scsi_device *sdev = to_scsi_device(dev);
516 unsigned short ms;
517
518 if (sscanf(buf, "%hu", &ms) > 0) {
519 blk_queue_max_hw_sectors(sdev->request_queue, ms);
520 return count;
521 }
522 return -EINVAL;
523}
524
525static DEVICE_ATTR(max_sectors, S_IRUGO | S_IWUSR, show_max_sectors,
526 store_max_sectors);
527
528static struct device_attribute *sysfs_device_attr_list[] = {
529 &dev_attr_max_sectors,
530 NULL,
531 };
532
533/*
534 * this defines our host template, with which we'll allocate hosts
535 */
536
537struct scsi_host_template usb_stor_host_template = {
538 /* basic userland interface stuff */
539 .name = "usb-storage",
540 .proc_name = "usb-storage",
541 .proc_info = proc_info,
542 .info = host_info,
543
544 /* command interface -- queued only */
545 .queuecommand = queuecommand,
546
547 /* error and abort handlers */
548 .eh_abort_handler = command_abort,
549 .eh_device_reset_handler = device_reset,
550 .eh_bus_reset_handler = bus_reset,
551
552 /* queue commands only, only one command per LUN */
553 .can_queue = 1,
554 .cmd_per_lun = 1,
555
556 /* unknown initiator id */
557 .this_id = -1,
558
559 .slave_alloc = slave_alloc,
560 .slave_configure = slave_configure,
561 .target_alloc = target_alloc,
562
563 /* lots of sg segments can be handled */
564 .sg_tablesize = SCSI_MAX_SG_CHAIN_SEGMENTS,
565
566 /* limit the total size of a transfer to 120 KB */
567 .max_sectors = 240,
568
569 /* merge commands... this seems to help performance, but
570 * periodically someone should test to see which setting is more
571 * optimal.
572 */
573 .use_clustering = 1,
574
575 /* emulated HBA */
576 .emulated = 1,
577
578 /* we do our own delay after a device or bus reset */
579 .skip_settle_delay = 1,
580
581 /* sysfs device attributes */
582 .sdev_attrs = sysfs_device_attr_list,
583
584 /* module management */
585 .module = THIS_MODULE
586};
587
588/* To Report "Illegal Request: Invalid Field in CDB */
589unsigned char usb_stor_sense_invalidCDB[18] = {
590 [0] = 0x70, /* current error */
591 [2] = ILLEGAL_REQUEST, /* Illegal Request = 0x05 */
592 [7] = 0x0a, /* additional length */
593 [12] = 0x24 /* Invalid Field in CDB */
594};
595EXPORT_SYMBOL_GPL(usb_stor_sense_invalidCDB);