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5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0+ |
f0183a33 FB |
2 | /* |
3 | * Driver for USB Mass Storage compliant devices | |
1da177e4 LT |
4 | * SCSI layer glue code |
5 | * | |
1da177e4 LT |
6 | * Current development and maintenance by: |
7 | * (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net) | |
8 | * | |
9 | * Developed with the assistance of: | |
10 | * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org) | |
11 | * (c) 2000 Stephen J. Gowdy (SGowdy@lbl.gov) | |
12 | * | |
13 | * Initial work by: | |
14 | * (c) 1999 Michael Gee (michael@linuxspecific.com) | |
15 | * | |
16 | * This driver is based on the 'USB Mass Storage Class' document. This | |
17 | * describes in detail the protocol used to communicate with such | |
18 | * devices. Clearly, the designers had SCSI and ATAPI commands in | |
19 | * mind when they created this document. The commands are all very | |
20 | * similar to commands in the SCSI-II and ATAPI specifications. | |
21 | * | |
22 | * It is important to note that in a number of cases this class | |
23 | * exhibits class-specific exemptions from the USB specification. | |
24 | * Notably the usage of NAK, STALL and ACK differs from the norm, in | |
25 | * that they are used to communicate wait, failed and OK on commands. | |
26 | * | |
27 | * Also, for certain devices, the interrupt endpoint is used to convey | |
28 | * status of a command. | |
29 | * | |
30 | * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more | |
31 | * information about this driver. | |
32 | * | |
33 | * This program is free software; you can redistribute it and/or modify it | |
34 | * under the terms of the GNU General Public License as published by the | |
35 | * Free Software Foundation; either version 2, or (at your option) any | |
36 | * later version. | |
37 | * | |
38 | * This program is distributed in the hope that it will be useful, but | |
39 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
40 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41 | * General Public License for more details. | |
42 | * | |
43 | * You should have received a copy of the GNU General Public License along | |
44 | * with this program; if not, write to the Free Software Foundation, Inc., | |
45 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
46 | */ | |
47 | ||
1da177e4 | 48 | #include <linux/module.h> |
4186ecf8 | 49 | #include <linux/mutex.h> |
1da177e4 LT |
50 | |
51 | #include <scsi/scsi.h> | |
52 | #include <scsi/scsi_cmnd.h> | |
53 | #include <scsi/scsi_devinfo.h> | |
54 | #include <scsi/scsi_device.h> | |
55 | #include <scsi/scsi_eh.h> | |
56 | ||
57 | #include "usb.h" | |
58 | #include "scsiglue.h" | |
59 | #include "debug.h" | |
60 | #include "transport.h" | |
61 | #include "protocol.h" | |
62 | ||
f0183a33 FB |
63 | /* |
64 | * Vendor IDs for companies that seem to include the READ CAPACITY bug | |
a81a81a2 AS |
65 | * in all their devices |
66 | */ | |
67 | #define VENDOR_ID_NOKIA 0x0421 | |
68 | #define VENDOR_ID_NIKON 0x04b0 | |
506e9469 | 69 | #define VENDOR_ID_PENTAX 0x0a17 |
a81a81a2 AS |
70 | #define VENDOR_ID_MOTOROLA 0x22b8 |
71 | ||
1da177e4 LT |
72 | /*********************************************************************** |
73 | * Host functions | |
74 | ***********************************************************************/ | |
75 | ||
76 | static const char* host_info(struct Scsi_Host *host) | |
77 | { | |
00fa43ef MW |
78 | struct us_data *us = host_to_us(host); |
79 | return us->scsi_name; | |
1da177e4 LT |
80 | } |
81 | ||
82 | static int slave_alloc (struct scsi_device *sdev) | |
83 | { | |
823d12c9 AS |
84 | struct us_data *us = host_to_us(sdev->host); |
85 | ||
1da177e4 LT |
86 | /* |
87 | * Set the INQUIRY transfer length to 36. We don't use any of | |
88 | * the extra data and many devices choke if asked for more or | |
89 | * less than 36 bytes. | |
90 | */ | |
91 | sdev->inquiry_len = 36; | |
3a3416b1 | 92 | |
f0183a33 FB |
93 | /* |
94 | * USB has unusual DMA-alignment requirements: Although the | |
f756cbd4 AS |
95 | * starting address of each scatter-gather element doesn't matter, |
96 | * the length of each element except the last must be divisible | |
97 | * by the Bulk maxpacket value. There's currently no way to | |
98 | * express this by block-layer constraints, so we'll cop out | |
99 | * and simply require addresses to be aligned at 512-byte | |
100 | * boundaries. This is okay since most block I/O involves | |
101 | * hardware sectors that are multiples of 512 bytes in length, | |
102 | * and since host controllers up through USB 2.0 have maxpacket | |
103 | * values no larger than 512. | |
104 | * | |
105 | * But it doesn't suffice for Wireless USB, where Bulk maxpacket | |
106 | * values can be as large as 2048. To make that work properly | |
107 | * will require changes to the block layer. | |
148d9fe4 | 108 | */ |
f756cbd4 | 109 | blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1)); |
465ff318 | 110 | |
823d12c9 AS |
111 | /* Tell the SCSI layer if we know there is more than one LUN */ |
112 | if (us->protocol == USB_PR_BULK && us->max_lun > 0) | |
113 | sdev->sdev_bflags |= BLIST_FORCELUN; | |
114 | ||
1da177e4 LT |
115 | return 0; |
116 | } | |
117 | ||
118 | static int slave_configure(struct scsi_device *sdev) | |
119 | { | |
120 | struct us_data *us = host_to_us(sdev->host); | |
121 | ||
f0183a33 FB |
122 | /* |
123 | * Many devices have trouble transferring more than 32KB at a time, | |
883d989a PD |
124 | * while others have trouble with more than 64K. At this time we |
125 | * are limiting both to 32K (64 sectores). | |
126 | */ | |
7e4d6c38 | 127 | if (us->fflags & (US_FL_MAX_SECTORS_64 | US_FL_MAX_SECTORS_MIN)) { |
33abc04f DM |
128 | unsigned int max_sectors = 64; |
129 | ||
7e4d6c38 | 130 | if (us->fflags & US_FL_MAX_SECTORS_MIN) |
09cbfeaf | 131 | max_sectors = PAGE_SIZE >> 9; |
49d6271b | 132 | if (queue_max_hw_sectors(sdev->request_queue) > max_sectors) |
086fa5ff | 133 | blk_queue_max_hw_sectors(sdev->request_queue, |
33abc04f | 134 | max_sectors); |
5c16034d | 135 | } else if (sdev->type == TYPE_TAPE) { |
f0183a33 FB |
136 | /* |
137 | * Tapes need much higher max_sector limits, so just | |
5c16034d AS |
138 | * raise it to the maximum possible (4 GB / 512) and |
139 | * let the queue segment size sort out the real limit. | |
140 | */ | |
086fa5ff | 141 | blk_queue_max_hw_sectors(sdev->request_queue, 0x7FFFFF); |
5b91dfe1 | 142 | } else if (us->pusb_dev->speed >= USB_SPEED_SUPER) { |
f0183a33 FB |
143 | /* |
144 | * USB3 devices will be limited to 2048 sectors. This gives us | |
5b91dfe1 FB |
145 | * better throughput on most devices. |
146 | */ | |
147 | blk_queue_max_hw_sectors(sdev->request_queue, 2048); | |
33abc04f | 148 | } |
1da177e4 | 149 | |
f0183a33 FB |
150 | /* |
151 | * Some USB host controllers can't do DMA; they have to use PIO. | |
96983d2d AS |
152 | * They indicate this by setting their dma_mask to NULL. For |
153 | * such controllers we need to make sure the block layer sets | |
154 | * up bounce buffers in addressable memory. | |
155 | */ | |
156 | if (!us->pusb_dev->bus->controller->dma_mask) | |
157 | blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_HIGH); | |
158 | ||
f0183a33 FB |
159 | /* |
160 | * We can't put these settings in slave_alloc() because that gets | |
1da177e4 | 161 | * called before the device type is known. Consequently these |
f0183a33 FB |
162 | * settings can't be overridden via the scsi devinfo mechanism. |
163 | */ | |
1da177e4 LT |
164 | if (sdev->type == TYPE_DISK) { |
165 | ||
f0183a33 FB |
166 | /* |
167 | * Some vendors seem to put the READ CAPACITY bug into | |
a81a81a2 AS |
168 | * all their devices -- primarily makers of cell phones |
169 | * and digital cameras. Since these devices always use | |
170 | * flash media and can be expected to have an even number | |
171 | * of sectors, we will always enable the CAPACITY_HEURISTICS | |
f0183a33 FB |
172 | * flag unless told otherwise. |
173 | */ | |
a81a81a2 AS |
174 | switch (le16_to_cpu(us->pusb_dev->descriptor.idVendor)) { |
175 | case VENDOR_ID_NOKIA: | |
176 | case VENDOR_ID_NIKON: | |
506e9469 | 177 | case VENDOR_ID_PENTAX: |
a81a81a2 AS |
178 | case VENDOR_ID_MOTOROLA: |
179 | if (!(us->fflags & (US_FL_FIX_CAPACITY | | |
180 | US_FL_CAPACITY_OK))) | |
181 | us->fflags |= US_FL_CAPACITY_HEURISTICS; | |
182 | break; | |
183 | } | |
184 | ||
f0183a33 FB |
185 | /* |
186 | * Disk-type devices use MODE SENSE(6) if the protocol | |
1da177e4 | 187 | * (SubClass) is Transparent SCSI, otherwise they use |
f0183a33 FB |
188 | * MODE SENSE(10). |
189 | */ | |
8fa7fd74 | 190 | if (us->subclass != USB_SC_SCSI && us->subclass != USB_SC_CYP_ATACB) |
1da177e4 LT |
191 | sdev->use_10_for_ms = 1; |
192 | ||
f0183a33 FB |
193 | /* |
194 | *Many disks only accept MODE SENSE transfer lengths of | |
195 | * 192 bytes (that's what Windows uses). | |
196 | */ | |
1da177e4 LT |
197 | sdev->use_192_bytes_for_3f = 1; |
198 | ||
f0183a33 FB |
199 | /* |
200 | * Some devices don't like MODE SENSE with page=0x3f, | |
1da177e4 LT |
201 | * which is the command used for checking if a device |
202 | * is write-protected. Now that we tell the sd driver | |
203 | * to do a 192-byte transfer with this command the | |
204 | * majority of devices work fine, but a few still can't | |
205 | * handle it. The sd driver will simply assume those | |
f0183a33 FB |
206 | * devices are write-enabled. |
207 | */ | |
7e4d6c38 | 208 | if (us->fflags & US_FL_NO_WP_DETECT) |
1da177e4 LT |
209 | sdev->skip_ms_page_3f = 1; |
210 | ||
f0183a33 FB |
211 | /* |
212 | * A number of devices have problems with MODE SENSE for | |
213 | * page x08, so we will skip it. | |
214 | */ | |
1da177e4 LT |
215 | sdev->skip_ms_page_8 = 1; |
216 | ||
09b6b51b AS |
217 | /* Some devices don't handle VPD pages correctly */ |
218 | sdev->skip_vpd_pages = 1; | |
219 | ||
3c6bdaea MP |
220 | /* Do not attempt to use REPORT SUPPORTED OPERATION CODES */ |
221 | sdev->no_report_opcodes = 1; | |
222 | ||
5db44863 MP |
223 | /* Do not attempt to use WRITE SAME */ |
224 | sdev->no_write_same = 1; | |
225 | ||
f0183a33 FB |
226 | /* |
227 | * Some disks return the total number of blocks in response | |
1da177e4 | 228 | * to READ CAPACITY rather than the highest block number. |
f0183a33 FB |
229 | * If this device makes that mistake, tell the sd driver. |
230 | */ | |
7e4d6c38 | 231 | if (us->fflags & US_FL_FIX_CAPACITY) |
1da177e4 | 232 | sdev->fix_capacity = 1; |
86dbde9c | 233 | |
f0183a33 FB |
234 | /* |
235 | * A few disks have two indistinguishable version, one of | |
61bf54b7 | 236 | * which reports the correct capacity and the other does not. |
f0183a33 FB |
237 | * The sd driver has to guess which is the case. |
238 | */ | |
7e4d6c38 | 239 | if (us->fflags & US_FL_CAPACITY_HEURISTICS) |
61bf54b7 ON |
240 | sdev->guess_capacity = 1; |
241 | ||
00914025 HG |
242 | /* Some devices cannot handle READ_CAPACITY_16 */ |
243 | if (us->fflags & US_FL_NO_READ_CAPACITY_16) | |
244 | sdev->no_read_capacity_16 = 1; | |
245 | ||
6a0bdffa AS |
246 | /* |
247 | * Many devices do not respond properly to READ_CAPACITY_16. | |
248 | * Tell the SCSI layer to try READ_CAPACITY_10 first. | |
32c37fc3 ON |
249 | * However some USB 3.0 drive enclosures return capacity |
250 | * modulo 2TB. Those must use READ_CAPACITY_16 | |
6a0bdffa | 251 | */ |
32c37fc3 ON |
252 | if (!(us->fflags & US_FL_NEEDS_CAP16)) |
253 | sdev->try_rc_10_first = 1; | |
6a0bdffa | 254 | |
1537e0ad BE |
255 | /* assume SPC3 or latter devices support sense size > 18 */ |
256 | if (sdev->scsi_level > SCSI_SPC_2) | |
257 | us->fflags |= US_FL_SANE_SENSE; | |
258 | ||
f0183a33 FB |
259 | /* |
260 | * USB-IDE bridges tend to report SK = 0x04 (Non-recoverable | |
86dbde9c MD |
261 | * Hardware Error) when any low-level error occurs, |
262 | * recoverable or not. Setting this flag tells the SCSI | |
263 | * midlayer to retry such commands, which frequently will | |
264 | * succeed and fix the error. The worst this can lead to | |
f0183a33 FB |
265 | * is an occasional series of retries that will all fail. |
266 | */ | |
86dbde9c MD |
267 | sdev->retry_hwerror = 1; |
268 | ||
f0183a33 FB |
269 | /* |
270 | * USB disks should allow restart. Some drives spin down | |
271 | * automatically, requiring a START-STOP UNIT command. | |
272 | */ | |
f09e495d MCC |
273 | sdev->allow_restart = 1; |
274 | ||
f0183a33 FB |
275 | /* |
276 | * Some USB cardreaders have trouble reading an sdcard's last | |
23c3e290 | 277 | * sector in a larger then 1 sector read, since the performance |
f0183a33 FB |
278 | * impact is negligible we set this flag for all USB disks |
279 | */ | |
23c3e290 | 280 | sdev->last_sector_bug = 1; |
25ff1c31 | 281 | |
f0183a33 FB |
282 | /* |
283 | * Enable last-sector hacks for single-target devices using | |
25ff1c31 | 284 | * the Bulk-only transport, unless we already know the |
f0183a33 FB |
285 | * capacity will be decremented or is correct. |
286 | */ | |
25ff1c31 AS |
287 | if (!(us->fflags & (US_FL_FIX_CAPACITY | US_FL_CAPACITY_OK | |
288 | US_FL_SCM_MULT_TARG)) && | |
8fa7fd74 | 289 | us->protocol == USB_PR_BULK) |
25ff1c31 | 290 | us->use_last_sector_hacks = 1; |
eaa05dfc NJ |
291 | |
292 | /* Check if write cache default on flag is set or not */ | |
293 | if (us->fflags & US_FL_WRITE_CACHE) | |
294 | sdev->wce_default_on = 1; | |
295 | ||
b14bf2d0 AS |
296 | /* A few buggy USB-ATA bridges don't understand FUA */ |
297 | if (us->fflags & US_FL_BROKEN_FUA) | |
298 | sdev->broken_fua = 1; | |
299 | ||
050bc4e8 ON |
300 | /* Some even totally fail to indicate a cache */ |
301 | if (us->fflags & US_FL_ALWAYS_SYNC) { | |
302 | /* don't read caching information */ | |
303 | sdev->skip_ms_page_8 = 1; | |
304 | sdev->skip_ms_page_3f = 1; | |
305 | /* assume sync is needed */ | |
306 | sdev->wce_default_on = 1; | |
307 | } | |
1da177e4 LT |
308 | } else { |
309 | ||
f0183a33 FB |
310 | /* |
311 | * Non-disk-type devices don't need to blacklist any pages | |
1da177e4 | 312 | * or to force 192-byte transfer lengths for MODE SENSE. |
f0183a33 FB |
313 | * But they do need to use MODE SENSE(10). |
314 | */ | |
1da177e4 | 315 | sdev->use_10_for_ms = 1; |
ae38c78a HG |
316 | |
317 | /* Some (fake) usb cdrom devices don't like READ_DISC_INFO */ | |
318 | if (us->fflags & US_FL_NO_READ_DISC_INFO) | |
319 | sdev->no_read_disc_info = 1; | |
1da177e4 LT |
320 | } |
321 | ||
f0183a33 FB |
322 | /* |
323 | * The CB and CBI transports have no way to pass LUN values | |
f3f49065 AS |
324 | * other than the bits in the second byte of a CDB. But those |
325 | * bits don't get set to the LUN value if the device reports | |
326 | * scsi_level == 0 (UNKNOWN). Hence such devices must necessarily | |
327 | * be single-LUN. | |
328 | */ | |
8fa7fd74 | 329 | if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_CBI) && |
f3f49065 AS |
330 | sdev->scsi_level == SCSI_UNKNOWN) |
331 | us->max_lun = 0; | |
332 | ||
f0183a33 FB |
333 | /* |
334 | * Some devices choke when they receive a PREVENT-ALLOW MEDIUM | |
335 | * REMOVAL command, so suppress those commands. | |
336 | */ | |
7e4d6c38 | 337 | if (us->fflags & US_FL_NOT_LOCKABLE) |
1da177e4 LT |
338 | sdev->lockable = 0; |
339 | ||
f0183a33 FB |
340 | /* |
341 | * this is to satisfy the compiler, tho I don't think the | |
342 | * return code is ever checked anywhere. | |
343 | */ | |
1da177e4 LT |
344 | return 0; |
345 | } | |
346 | ||
09b6b51b AS |
347 | static int target_alloc(struct scsi_target *starget) |
348 | { | |
af74d2da AS |
349 | struct us_data *us = host_to_us(dev_to_shost(starget->dev.parent)); |
350 | ||
09b6b51b AS |
351 | /* |
352 | * Some USB drives don't support REPORT LUNS, even though they | |
353 | * report a SCSI revision level above 2. Tell the SCSI layer | |
354 | * not to issue that command; it will perform a normal sequential | |
355 | * scan instead. | |
356 | */ | |
357 | starget->no_report_luns = 1; | |
af74d2da AS |
358 | |
359 | /* | |
360 | * The UFI spec treats the Peripheral Qualifier bits in an | |
361 | * INQUIRY result as reserved and requires devices to set them | |
362 | * to 0. However the SCSI spec requires these bits to be set | |
363 | * to 3 to indicate when a LUN is not present. | |
364 | * | |
365 | * Let the scanning code know if this target merely sets | |
366 | * Peripheral Device Type to 0x1f to indicate no LUN. | |
367 | */ | |
368 | if (us->subclass == USB_SC_UFI) | |
369 | starget->pdt_1f_for_no_lun = 1; | |
370 | ||
09b6b51b AS |
371 | return 0; |
372 | } | |
373 | ||
1da177e4 LT |
374 | /* queue a command */ |
375 | /* This is always called with scsi_lock(host) held */ | |
f281233d | 376 | static int queuecommand_lck(struct scsi_cmnd *srb, |
1da177e4 LT |
377 | void (*done)(struct scsi_cmnd *)) |
378 | { | |
379 | struct us_data *us = host_to_us(srb->device->host); | |
380 | ||
1da177e4 LT |
381 | /* check for state-transition errors */ |
382 | if (us->srb != NULL) { | |
383 | printk(KERN_ERR USB_STORAGE "Error in %s: us->srb = %p\n", | |
441b62c1 | 384 | __func__, us->srb); |
1da177e4 LT |
385 | return SCSI_MLQUEUE_HOST_BUSY; |
386 | } | |
387 | ||
388 | /* fail the command if we are disconnecting */ | |
7e4d6c38 | 389 | if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { |
191648d0 | 390 | usb_stor_dbg(us, "Fail command during disconnect\n"); |
1da177e4 LT |
391 | srb->result = DID_NO_CONNECT << 16; |
392 | done(srb); | |
393 | return 0; | |
394 | } | |
395 | ||
396 | /* enqueue the command and wake up the control thread */ | |
397 | srb->scsi_done = done; | |
398 | us->srb = srb; | |
7119e3c3 | 399 | complete(&us->cmnd_ready); |
1da177e4 LT |
400 | |
401 | return 0; | |
402 | } | |
403 | ||
f281233d JG |
404 | static DEF_SCSI_QCMD(queuecommand) |
405 | ||
1da177e4 LT |
406 | /*********************************************************************** |
407 | * Error handling functions | |
408 | ***********************************************************************/ | |
409 | ||
410 | /* Command timeout and abort */ | |
1da177e4 LT |
411 | static int command_abort(struct scsi_cmnd *srb) |
412 | { | |
413 | struct us_data *us = host_to_us(srb->device->host); | |
414 | ||
191648d0 | 415 | usb_stor_dbg(us, "%s called\n", __func__); |
1da177e4 | 416 | |
f0183a33 FB |
417 | /* |
418 | * us->srb together with the TIMED_OUT, RESETTING, and ABORTING | |
419 | * bits are protected by the host lock. | |
420 | */ | |
226173ed MD |
421 | scsi_lock(us_to_host(us)); |
422 | ||
1da177e4 LT |
423 | /* Is this command still active? */ |
424 | if (us->srb != srb) { | |
226173ed | 425 | scsi_unlock(us_to_host(us)); |
191648d0 | 426 | usb_stor_dbg(us, "-- nothing to abort\n"); |
1da177e4 LT |
427 | return FAILED; |
428 | } | |
429 | ||
f0183a33 FB |
430 | /* |
431 | * Set the TIMED_OUT bit. Also set the ABORTING bit, but only if | |
1da177e4 | 432 | * a device reset isn't already in progress (to avoid interfering |
226173ed MD |
433 | * with the reset). Note that we must retain the host lock while |
434 | * calling usb_stor_stop_transport(); otherwise it might interfere | |
f0183a33 FB |
435 | * with an auto-reset that begins as soon as we release the lock. |
436 | */ | |
7e4d6c38 AS |
437 | set_bit(US_FLIDX_TIMED_OUT, &us->dflags); |
438 | if (!test_bit(US_FLIDX_RESETTING, &us->dflags)) { | |
439 | set_bit(US_FLIDX_ABORTING, &us->dflags); | |
1da177e4 LT |
440 | usb_stor_stop_transport(us); |
441 | } | |
226173ed | 442 | scsi_unlock(us_to_host(us)); |
1da177e4 LT |
443 | |
444 | /* Wait for the aborted command to finish */ | |
445 | wait_for_completion(&us->notify); | |
1da177e4 LT |
446 | return SUCCESS; |
447 | } | |
448 | ||
f0183a33 FB |
449 | /* |
450 | * This invokes the transport reset mechanism to reset the state of the | |
451 | * device | |
452 | */ | |
1da177e4 LT |
453 | static int device_reset(struct scsi_cmnd *srb) |
454 | { | |
455 | struct us_data *us = host_to_us(srb->device->host); | |
456 | int result; | |
457 | ||
191648d0 | 458 | usb_stor_dbg(us, "%s called\n", __func__); |
1da177e4 | 459 | |
d526875d GKH |
460 | /* lock the device pointers and do the reset */ |
461 | mutex_lock(&(us->dev_mutex)); | |
462 | result = us->transport_reset(us); | |
463 | mutex_unlock(&us->dev_mutex); | |
1da177e4 | 464 | |
4d07ef76 | 465 | return result < 0 ? FAILED : SUCCESS; |
1da177e4 LT |
466 | } |
467 | ||
4d07ef76 | 468 | /* Simulate a SCSI bus reset by resetting the device's USB port. */ |
1da177e4 LT |
469 | static int bus_reset(struct scsi_cmnd *srb) |
470 | { | |
471 | struct us_data *us = host_to_us(srb->device->host); | |
4d07ef76 | 472 | int result; |
1da177e4 | 473 | |
191648d0 JP |
474 | usb_stor_dbg(us, "%s called\n", __func__); |
475 | ||
4d07ef76 | 476 | result = usb_stor_port_reset(us); |
1da177e4 LT |
477 | return result < 0 ? FAILED : SUCCESS; |
478 | } | |
479 | ||
f0183a33 FB |
480 | /* |
481 | * Report a driver-initiated device reset to the SCSI layer. | |
1da177e4 | 482 | * Calling this for a SCSI-initiated reset is unnecessary but harmless. |
f0183a33 FB |
483 | * The caller must own the SCSI host lock. |
484 | */ | |
1da177e4 LT |
485 | void usb_stor_report_device_reset(struct us_data *us) |
486 | { | |
487 | int i; | |
488 | struct Scsi_Host *host = us_to_host(us); | |
489 | ||
490 | scsi_report_device_reset(host, 0, 0); | |
7e4d6c38 | 491 | if (us->fflags & US_FL_SCM_MULT_TARG) { |
1da177e4 LT |
492 | for (i = 1; i < host->max_id; ++i) |
493 | scsi_report_device_reset(host, 0, i); | |
494 | } | |
495 | } | |
496 | ||
f0183a33 FB |
497 | /* |
498 | * Report a driver-initiated bus reset to the SCSI layer. | |
4d07ef76 | 499 | * Calling this for a SCSI-initiated reset is unnecessary but harmless. |
f0183a33 FB |
500 | * The caller must not own the SCSI host lock. |
501 | */ | |
4d07ef76 MD |
502 | void usb_stor_report_bus_reset(struct us_data *us) |
503 | { | |
f07600cf AS |
504 | struct Scsi_Host *host = us_to_host(us); |
505 | ||
506 | scsi_lock(host); | |
507 | scsi_report_bus_reset(host, 0); | |
508 | scsi_unlock(host); | |
4d07ef76 MD |
509 | } |
510 | ||
1da177e4 LT |
511 | /*********************************************************************** |
512 | * /proc/scsi/ functions | |
513 | ***********************************************************************/ | |
514 | ||
09dae7fc AV |
515 | static int write_info(struct Scsi_Host *host, char *buffer, int length) |
516 | { | |
517 | /* if someone is sending us data, just throw it away */ | |
518 | return length; | |
519 | } | |
520 | ||
09dae7fc | 521 | static int show_info (struct seq_file *m, struct Scsi_Host *host) |
1da177e4 LT |
522 | { |
523 | struct us_data *us = host_to_us(host); | |
1da177e4 LT |
524 | const char *string; |
525 | ||
1da177e4 | 526 | /* print the controller name */ |
7d203a9e | 527 | seq_printf(m, " Host scsi%d: usb-storage\n", host->host_no); |
1da177e4 LT |
528 | |
529 | /* print product, vendor, and serial number strings */ | |
530 | if (us->pusb_dev->manufacturer) | |
531 | string = us->pusb_dev->manufacturer; | |
532 | else if (us->unusual_dev->vendorName) | |
533 | string = us->unusual_dev->vendorName; | |
534 | else | |
535 | string = "Unknown"; | |
7d203a9e | 536 | seq_printf(m, " Vendor: %s\n", string); |
1da177e4 LT |
537 | if (us->pusb_dev->product) |
538 | string = us->pusb_dev->product; | |
539 | else if (us->unusual_dev->productName) | |
540 | string = us->unusual_dev->productName; | |
541 | else | |
542 | string = "Unknown"; | |
7d203a9e | 543 | seq_printf(m, " Product: %s\n", string); |
1da177e4 LT |
544 | if (us->pusb_dev->serial) |
545 | string = us->pusb_dev->serial; | |
546 | else | |
547 | string = "None"; | |
7d203a9e | 548 | seq_printf(m, "Serial Number: %s\n", string); |
1da177e4 LT |
549 | |
550 | /* show the protocol and transport */ | |
7d203a9e JP |
551 | seq_printf(m, " Protocol: %s\n", us->protocol_name); |
552 | seq_printf(m, " Transport: %s\n", us->transport_name); | |
1da177e4 LT |
553 | |
554 | /* show the device flags */ | |
7d203a9e | 555 | seq_printf(m, " Quirks:"); |
1da177e4 LT |
556 | |
557 | #define US_FLAG(name, value) \ | |
09dae7fc | 558 | if (us->fflags & value) seq_printf(m, " " #name); |
1da177e4 LT |
559 | US_DO_ALL_FLAGS |
560 | #undef US_FLAG | |
09dae7fc AV |
561 | seq_putc(m, '\n'); |
562 | return 0; | |
1da177e4 LT |
563 | } |
564 | ||
565 | /*********************************************************************** | |
566 | * Sysfs interface | |
567 | ***********************************************************************/ | |
568 | ||
569 | /* Output routine for the sysfs max_sectors file */ | |
f2e0ae93 | 570 | static ssize_t max_sectors_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
571 | { |
572 | struct scsi_device *sdev = to_scsi_device(dev); | |
573 | ||
49d6271b | 574 | return sprintf(buf, "%u\n", queue_max_hw_sectors(sdev->request_queue)); |
1da177e4 LT |
575 | } |
576 | ||
577 | /* Input routine for the sysfs max_sectors file */ | |
f2e0ae93 | 578 | static ssize_t max_sectors_store(struct device *dev, struct device_attribute *attr, const char *buf, |
1da177e4 LT |
579 | size_t count) |
580 | { | |
581 | struct scsi_device *sdev = to_scsi_device(dev); | |
582 | unsigned short ms; | |
583 | ||
49d6271b | 584 | if (sscanf(buf, "%hu", &ms) > 0) { |
086fa5ff | 585 | blk_queue_max_hw_sectors(sdev->request_queue, ms); |
49d6271b | 586 | return count; |
1da177e4 | 587 | } |
f2e0ae93 | 588 | return -EINVAL; |
1da177e4 | 589 | } |
f2e0ae93 | 590 | static DEVICE_ATTR_RW(max_sectors); |
1da177e4 LT |
591 | |
592 | static struct device_attribute *sysfs_device_attr_list[] = { | |
f2e0ae93 GKH |
593 | &dev_attr_max_sectors, |
594 | NULL, | |
595 | }; | |
1da177e4 LT |
596 | |
597 | /* | |
598 | * this defines our host template, with which we'll allocate hosts | |
599 | */ | |
600 | ||
aa519be3 | 601 | static const struct scsi_host_template usb_stor_host_template = { |
1da177e4 LT |
602 | /* basic userland interface stuff */ |
603 | .name = "usb-storage", | |
604 | .proc_name = "usb-storage", | |
09dae7fc AV |
605 | .show_info = show_info, |
606 | .write_info = write_info, | |
1da177e4 LT |
607 | .info = host_info, |
608 | ||
609 | /* command interface -- queued only */ | |
610 | .queuecommand = queuecommand, | |
611 | ||
612 | /* error and abort handlers */ | |
613 | .eh_abort_handler = command_abort, | |
614 | .eh_device_reset_handler = device_reset, | |
615 | .eh_bus_reset_handler = bus_reset, | |
616 | ||
617 | /* queue commands only, only one command per LUN */ | |
618 | .can_queue = 1, | |
1da177e4 LT |
619 | |
620 | /* unknown initiator id */ | |
621 | .this_id = -1, | |
622 | ||
623 | .slave_alloc = slave_alloc, | |
624 | .slave_configure = slave_configure, | |
09b6b51b | 625 | .target_alloc = target_alloc, |
1da177e4 LT |
626 | |
627 | /* lots of sg segments can be handled */ | |
65e8617f | 628 | .sg_tablesize = SG_MAX_SEGMENTS, |
1da177e4 | 629 | |
779b457f FB |
630 | |
631 | /* | |
632 | * Limit the total size of a transfer to 120 KB. | |
633 | * | |
634 | * Some devices are known to choke with anything larger. It seems like | |
635 | * the problem stems from the fact that original IDE controllers had | |
636 | * only an 8-bit register to hold the number of sectors in one transfer | |
637 | * and even those couldn't handle a full 256 sectors. | |
638 | * | |
639 | * Because we want to make sure we interoperate with as many devices as | |
640 | * possible, we will maintain a 240 sector transfer size limit for USB | |
641 | * Mass Storage devices. | |
642 | * | |
643 | * Tests show that other operating have similar limits with Microsoft | |
644 | * Windows 7 limiting transfers to 128 sectors for both USB2 and USB3 | |
645 | * and Apple Mac OS X 10.11 limiting transfers to 256 sectors for USB2 | |
646 | * and 2048 for USB3 devices. | |
647 | */ | |
1da177e4 LT |
648 | .max_sectors = 240, |
649 | ||
f0183a33 FB |
650 | /* |
651 | * merge commands... this seems to help performance, but | |
1da177e4 LT |
652 | * periodically someone should test to see which setting is more |
653 | * optimal. | |
654 | */ | |
655 | .use_clustering = 1, | |
656 | ||
657 | /* emulated HBA */ | |
658 | .emulated = 1, | |
659 | ||
660 | /* we do our own delay after a device or bus reset */ | |
661 | .skip_settle_delay = 1, | |
662 | ||
663 | /* sysfs device attributes */ | |
664 | .sdev_attrs = sysfs_device_attr_list, | |
665 | ||
666 | /* module management */ | |
667 | .module = THIS_MODULE | |
668 | }; | |
669 | ||
aa519be3 AM |
670 | void usb_stor_host_template_init(struct scsi_host_template *sht, |
671 | const char *name, struct module *owner) | |
672 | { | |
673 | *sht = usb_stor_host_template; | |
674 | sht->name = name; | |
675 | sht->proc_name = name; | |
676 | sht->module = owner; | |
677 | } | |
678 | EXPORT_SYMBOL_GPL(usb_stor_host_template_init); | |
679 | ||
1da177e4 LT |
680 | /* To Report "Illegal Request: Invalid Field in CDB */ |
681 | unsigned char usb_stor_sense_invalidCDB[18] = { | |
682 | [0] = 0x70, /* current error */ | |
683 | [2] = ILLEGAL_REQUEST, /* Illegal Request = 0x05 */ | |
684 | [7] = 0x0a, /* additional length */ | |
685 | [12] = 0x24 /* Invalid Field in CDB */ | |
686 | }; | |
e6e244b6 | 687 | EXPORT_SYMBOL_GPL(usb_stor_sense_invalidCDB); |