Commit | Line | Data |
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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. | |
1da177e4 LT |
29 | */ |
30 | ||
d74ffae8 YS |
31 | #include <linux/blkdev.h> |
32 | #include <linux/dma-mapping.h> | |
1da177e4 | 33 | #include <linux/module.h> |
4186ecf8 | 34 | #include <linux/mutex.h> |
1da177e4 LT |
35 | |
36 | #include <scsi/scsi.h> | |
37 | #include <scsi/scsi_cmnd.h> | |
38 | #include <scsi/scsi_devinfo.h> | |
39 | #include <scsi/scsi_device.h> | |
40 | #include <scsi/scsi_eh.h> | |
41 | ||
42 | #include "usb.h" | |
43 | #include "scsiglue.h" | |
44 | #include "debug.h" | |
45 | #include "transport.h" | |
46 | #include "protocol.h" | |
47 | ||
f0183a33 FB |
48 | /* |
49 | * Vendor IDs for companies that seem to include the READ CAPACITY bug | |
a81a81a2 AS |
50 | * in all their devices |
51 | */ | |
52 | #define VENDOR_ID_NOKIA 0x0421 | |
53 | #define VENDOR_ID_NIKON 0x04b0 | |
506e9469 | 54 | #define VENDOR_ID_PENTAX 0x0a17 |
a81a81a2 AS |
55 | #define VENDOR_ID_MOTOROLA 0x22b8 |
56 | ||
1da177e4 LT |
57 | /*********************************************************************** |
58 | * Host functions | |
59 | ***********************************************************************/ | |
60 | ||
61 | static const char* host_info(struct Scsi_Host *host) | |
62 | { | |
00fa43ef MW |
63 | struct us_data *us = host_to_us(host); |
64 | return us->scsi_name; | |
1da177e4 LT |
65 | } |
66 | ||
67 | static int slave_alloc (struct scsi_device *sdev) | |
68 | { | |
823d12c9 AS |
69 | struct us_data *us = host_to_us(sdev->host); |
70 | ||
1da177e4 LT |
71 | /* |
72 | * Set the INQUIRY transfer length to 36. We don't use any of | |
73 | * the extra data and many devices choke if asked for more or | |
74 | * less than 36 bytes. | |
75 | */ | |
76 | sdev->inquiry_len = 36; | |
3a3416b1 | 77 | |
823d12c9 AS |
78 | /* Tell the SCSI layer if we know there is more than one LUN */ |
79 | if (us->protocol == USB_PR_BULK && us->max_lun > 0) | |
80 | sdev->sdev_bflags |= BLIST_FORCELUN; | |
81 | ||
1da177e4 LT |
82 | return 0; |
83 | } | |
84 | ||
70a79493 | 85 | static int device_configure(struct scsi_device *sdev, struct queue_limits *lim) |
1da177e4 LT |
86 | { |
87 | struct us_data *us = host_to_us(sdev->host); | |
97ad4a77 | 88 | struct device *dev = us->pusb_dev->bus->sysdev; |
1da177e4 | 89 | |
f0183a33 FB |
90 | /* |
91 | * Many devices have trouble transferring more than 32KB at a time, | |
883d989a PD |
92 | * while others have trouble with more than 64K. At this time we |
93 | * are limiting both to 32K (64 sectores). | |
94 | */ | |
7e4d6c38 | 95 | if (us->fflags & (US_FL_MAX_SECTORS_64 | US_FL_MAX_SECTORS_MIN)) { |
33abc04f DM |
96 | unsigned int max_sectors = 64; |
97 | ||
7e4d6c38 | 98 | if (us->fflags & US_FL_MAX_SECTORS_MIN) |
09cbfeaf | 99 | max_sectors = PAGE_SIZE >> 9; |
70a79493 | 100 | lim->max_hw_sectors = min(lim->max_hw_sectors, max_sectors); |
5c16034d | 101 | } else if (sdev->type == TYPE_TAPE) { |
f0183a33 FB |
102 | /* |
103 | * Tapes need much higher max_sector limits, so just | |
5c16034d AS |
104 | * raise it to the maximum possible (4 GB / 512) and |
105 | * let the queue segment size sort out the real limit. | |
106 | */ | |
70a79493 | 107 | lim->max_hw_sectors = 0x7FFFFF; |
5b91dfe1 | 108 | } else if (us->pusb_dev->speed >= USB_SPEED_SUPER) { |
f0183a33 FB |
109 | /* |
110 | * USB3 devices will be limited to 2048 sectors. This gives us | |
5b91dfe1 FB |
111 | * better throughput on most devices. |
112 | */ | |
70a79493 | 113 | lim->max_hw_sectors = 2048; |
33abc04f | 114 | } |
1da177e4 | 115 | |
d74ffae8 YS |
116 | /* |
117 | * The max_hw_sectors should be up to maximum size of a mapping for | |
118 | * the device. Otherwise, a DMA API might fail on swiotlb environment. | |
119 | */ | |
70a79493 CH |
120 | lim->max_hw_sectors = min_t(size_t, |
121 | lim->max_hw_sectors, dma_max_mapping_size(dev) >> SECTOR_SHIFT); | |
d74ffae8 | 122 | |
f0183a33 FB |
123 | /* |
124 | * We can't put these settings in slave_alloc() because that gets | |
1da177e4 | 125 | * called before the device type is known. Consequently these |
f0183a33 FB |
126 | * settings can't be overridden via the scsi devinfo mechanism. |
127 | */ | |
1da177e4 LT |
128 | if (sdev->type == TYPE_DISK) { |
129 | ||
f0183a33 FB |
130 | /* |
131 | * Some vendors seem to put the READ CAPACITY bug into | |
a81a81a2 AS |
132 | * all their devices -- primarily makers of cell phones |
133 | * and digital cameras. Since these devices always use | |
134 | * flash media and can be expected to have an even number | |
135 | * of sectors, we will always enable the CAPACITY_HEURISTICS | |
f0183a33 FB |
136 | * flag unless told otherwise. |
137 | */ | |
a81a81a2 AS |
138 | switch (le16_to_cpu(us->pusb_dev->descriptor.idVendor)) { |
139 | case VENDOR_ID_NOKIA: | |
140 | case VENDOR_ID_NIKON: | |
506e9469 | 141 | case VENDOR_ID_PENTAX: |
a81a81a2 AS |
142 | case VENDOR_ID_MOTOROLA: |
143 | if (!(us->fflags & (US_FL_FIX_CAPACITY | | |
144 | US_FL_CAPACITY_OK))) | |
145 | us->fflags |= US_FL_CAPACITY_HEURISTICS; | |
146 | break; | |
147 | } | |
148 | ||
f0183a33 FB |
149 | /* |
150 | * Disk-type devices use MODE SENSE(6) if the protocol | |
1da177e4 | 151 | * (SubClass) is Transparent SCSI, otherwise they use |
f0183a33 FB |
152 | * MODE SENSE(10). |
153 | */ | |
8fa7fd74 | 154 | if (us->subclass != USB_SC_SCSI && us->subclass != USB_SC_CYP_ATACB) |
1da177e4 LT |
155 | sdev->use_10_for_ms = 1; |
156 | ||
f0183a33 FB |
157 | /* |
158 | *Many disks only accept MODE SENSE transfer lengths of | |
159 | * 192 bytes (that's what Windows uses). | |
160 | */ | |
1da177e4 LT |
161 | sdev->use_192_bytes_for_3f = 1; |
162 | ||
321da3dc MP |
163 | /* |
164 | * Some devices report generic values until the media has been | |
165 | * accessed. Force a READ(10) prior to querying device | |
166 | * characteristics. | |
167 | */ | |
168 | sdev->read_before_ms = 1; | |
169 | ||
f0183a33 FB |
170 | /* |
171 | * Some devices don't like MODE SENSE with page=0x3f, | |
1da177e4 LT |
172 | * which is the command used for checking if a device |
173 | * is write-protected. Now that we tell the sd driver | |
174 | * to do a 192-byte transfer with this command the | |
175 | * majority of devices work fine, but a few still can't | |
176 | * handle it. The sd driver will simply assume those | |
f0183a33 FB |
177 | * devices are write-enabled. |
178 | */ | |
7e4d6c38 | 179 | if (us->fflags & US_FL_NO_WP_DETECT) |
1da177e4 LT |
180 | sdev->skip_ms_page_3f = 1; |
181 | ||
f0183a33 FB |
182 | /* |
183 | * A number of devices have problems with MODE SENSE for | |
184 | * page x08, so we will skip it. | |
185 | */ | |
1da177e4 LT |
186 | sdev->skip_ms_page_8 = 1; |
187 | ||
34914878 MPS |
188 | /* |
189 | * Some devices don't handle VPD pages correctly, so skip vpd | |
190 | * pages if not forced by SCSI layer. | |
191 | */ | |
192 | sdev->skip_vpd_pages = !sdev->try_vpd_pages; | |
09b6b51b | 193 | |
3c6bdaea MP |
194 | /* Do not attempt to use REPORT SUPPORTED OPERATION CODES */ |
195 | sdev->no_report_opcodes = 1; | |
196 | ||
5db44863 MP |
197 | /* Do not attempt to use WRITE SAME */ |
198 | sdev->no_write_same = 1; | |
199 | ||
f0183a33 FB |
200 | /* |
201 | * Some disks return the total number of blocks in response | |
1da177e4 | 202 | * to READ CAPACITY rather than the highest block number. |
f0183a33 FB |
203 | * If this device makes that mistake, tell the sd driver. |
204 | */ | |
7e4d6c38 | 205 | if (us->fflags & US_FL_FIX_CAPACITY) |
1da177e4 | 206 | sdev->fix_capacity = 1; |
86dbde9c | 207 | |
f0183a33 FB |
208 | /* |
209 | * A few disks have two indistinguishable version, one of | |
61bf54b7 | 210 | * which reports the correct capacity and the other does not. |
f0183a33 FB |
211 | * The sd driver has to guess which is the case. |
212 | */ | |
7e4d6c38 | 213 | if (us->fflags & US_FL_CAPACITY_HEURISTICS) |
61bf54b7 ON |
214 | sdev->guess_capacity = 1; |
215 | ||
00914025 HG |
216 | /* Some devices cannot handle READ_CAPACITY_16 */ |
217 | if (us->fflags & US_FL_NO_READ_CAPACITY_16) | |
218 | sdev->no_read_capacity_16 = 1; | |
219 | ||
6a0bdffa AS |
220 | /* |
221 | * Many devices do not respond properly to READ_CAPACITY_16. | |
222 | * Tell the SCSI layer to try READ_CAPACITY_10 first. | |
32c37fc3 ON |
223 | * However some USB 3.0 drive enclosures return capacity |
224 | * modulo 2TB. Those must use READ_CAPACITY_16 | |
6a0bdffa | 225 | */ |
32c37fc3 ON |
226 | if (!(us->fflags & US_FL_NEEDS_CAP16)) |
227 | sdev->try_rc_10_first = 1; | |
6a0bdffa | 228 | |
c5603d2f IZ |
229 | /* |
230 | * assume SPC3 or latter devices support sense size > 18 | |
231 | * unless US_FL_BAD_SENSE quirk is specified. | |
232 | */ | |
233 | if (sdev->scsi_level > SCSI_SPC_2 && | |
234 | !(us->fflags & US_FL_BAD_SENSE)) | |
1537e0ad BE |
235 | us->fflags |= US_FL_SANE_SENSE; |
236 | ||
f0183a33 FB |
237 | /* |
238 | * USB-IDE bridges tend to report SK = 0x04 (Non-recoverable | |
86dbde9c MD |
239 | * Hardware Error) when any low-level error occurs, |
240 | * recoverable or not. Setting this flag tells the SCSI | |
241 | * midlayer to retry such commands, which frequently will | |
242 | * succeed and fix the error. The worst this can lead to | |
f0183a33 FB |
243 | * is an occasional series of retries that will all fail. |
244 | */ | |
86dbde9c MD |
245 | sdev->retry_hwerror = 1; |
246 | ||
f0183a33 FB |
247 | /* |
248 | * USB disks should allow restart. Some drives spin down | |
249 | * automatically, requiring a START-STOP UNIT command. | |
250 | */ | |
f09e495d MCC |
251 | sdev->allow_restart = 1; |
252 | ||
f0183a33 FB |
253 | /* |
254 | * Some USB cardreaders have trouble reading an sdcard's last | |
23c3e290 | 255 | * sector in a larger then 1 sector read, since the performance |
f0183a33 FB |
256 | * impact is negligible we set this flag for all USB disks |
257 | */ | |
23c3e290 | 258 | sdev->last_sector_bug = 1; |
25ff1c31 | 259 | |
f0183a33 FB |
260 | /* |
261 | * Enable last-sector hacks for single-target devices using | |
25ff1c31 | 262 | * the Bulk-only transport, unless we already know the |
f0183a33 FB |
263 | * capacity will be decremented or is correct. |
264 | */ | |
25ff1c31 AS |
265 | if (!(us->fflags & (US_FL_FIX_CAPACITY | US_FL_CAPACITY_OK | |
266 | US_FL_SCM_MULT_TARG)) && | |
8fa7fd74 | 267 | us->protocol == USB_PR_BULK) |
25ff1c31 | 268 | us->use_last_sector_hacks = 1; |
eaa05dfc NJ |
269 | |
270 | /* Check if write cache default on flag is set or not */ | |
271 | if (us->fflags & US_FL_WRITE_CACHE) | |
272 | sdev->wce_default_on = 1; | |
273 | ||
b14bf2d0 AS |
274 | /* A few buggy USB-ATA bridges don't understand FUA */ |
275 | if (us->fflags & US_FL_BROKEN_FUA) | |
276 | sdev->broken_fua = 1; | |
277 | ||
050bc4e8 ON |
278 | /* Some even totally fail to indicate a cache */ |
279 | if (us->fflags & US_FL_ALWAYS_SYNC) { | |
280 | /* don't read caching information */ | |
281 | sdev->skip_ms_page_8 = 1; | |
282 | sdev->skip_ms_page_3f = 1; | |
283 | /* assume sync is needed */ | |
284 | sdev->wce_default_on = 1; | |
285 | } | |
1da177e4 LT |
286 | } else { |
287 | ||
f0183a33 | 288 | /* |
19246d27 | 289 | * Non-disk-type devices don't need to ignore any pages |
1da177e4 | 290 | * or to force 192-byte transfer lengths for MODE SENSE. |
f0183a33 FB |
291 | * But they do need to use MODE SENSE(10). |
292 | */ | |
1da177e4 | 293 | sdev->use_10_for_ms = 1; |
ae38c78a HG |
294 | |
295 | /* Some (fake) usb cdrom devices don't like READ_DISC_INFO */ | |
296 | if (us->fflags & US_FL_NO_READ_DISC_INFO) | |
297 | sdev->no_read_disc_info = 1; | |
1da177e4 LT |
298 | } |
299 | ||
f0183a33 FB |
300 | /* |
301 | * The CB and CBI transports have no way to pass LUN values | |
f3f49065 AS |
302 | * other than the bits in the second byte of a CDB. But those |
303 | * bits don't get set to the LUN value if the device reports | |
304 | * scsi_level == 0 (UNKNOWN). Hence such devices must necessarily | |
305 | * be single-LUN. | |
306 | */ | |
8fa7fd74 | 307 | if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_CBI) && |
f3f49065 AS |
308 | sdev->scsi_level == SCSI_UNKNOWN) |
309 | us->max_lun = 0; | |
310 | ||
f0183a33 FB |
311 | /* |
312 | * Some devices choke when they receive a PREVENT-ALLOW MEDIUM | |
313 | * REMOVAL command, so suppress those commands. | |
314 | */ | |
7e4d6c38 | 315 | if (us->fflags & US_FL_NOT_LOCKABLE) |
1da177e4 LT |
316 | sdev->lockable = 0; |
317 | ||
f0183a33 FB |
318 | /* |
319 | * this is to satisfy the compiler, tho I don't think the | |
320 | * return code is ever checked anywhere. | |
321 | */ | |
1da177e4 LT |
322 | return 0; |
323 | } | |
324 | ||
09b6b51b AS |
325 | static int target_alloc(struct scsi_target *starget) |
326 | { | |
af74d2da AS |
327 | struct us_data *us = host_to_us(dev_to_shost(starget->dev.parent)); |
328 | ||
09b6b51b AS |
329 | /* |
330 | * Some USB drives don't support REPORT LUNS, even though they | |
331 | * report a SCSI revision level above 2. Tell the SCSI layer | |
332 | * not to issue that command; it will perform a normal sequential | |
333 | * scan instead. | |
334 | */ | |
335 | starget->no_report_luns = 1; | |
af74d2da AS |
336 | |
337 | /* | |
338 | * The UFI spec treats the Peripheral Qualifier bits in an | |
339 | * INQUIRY result as reserved and requires devices to set them | |
340 | * to 0. However the SCSI spec requires these bits to be set | |
341 | * to 3 to indicate when a LUN is not present. | |
342 | * | |
343 | * Let the scanning code know if this target merely sets | |
344 | * Peripheral Device Type to 0x1f to indicate no LUN. | |
345 | */ | |
346 | if (us->subclass == USB_SC_UFI) | |
347 | starget->pdt_1f_for_no_lun = 1; | |
348 | ||
09b6b51b AS |
349 | return 0; |
350 | } | |
351 | ||
1da177e4 LT |
352 | /* queue a command */ |
353 | /* This is always called with scsi_lock(host) held */ | |
af049dfd | 354 | static int queuecommand_lck(struct scsi_cmnd *srb) |
1da177e4 | 355 | { |
af049dfd | 356 | void (*done)(struct scsi_cmnd *) = scsi_done; |
1da177e4 LT |
357 | struct us_data *us = host_to_us(srb->device->host); |
358 | ||
1da177e4 LT |
359 | /* check for state-transition errors */ |
360 | if (us->srb != NULL) { | |
3055c92c MM |
361 | dev_err(&us->pusb_intf->dev, |
362 | "Error in %s: us->srb = %p\n", __func__, us->srb); | |
1da177e4 LT |
363 | return SCSI_MLQUEUE_HOST_BUSY; |
364 | } | |
365 | ||
366 | /* fail the command if we are disconnecting */ | |
7e4d6c38 | 367 | if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { |
191648d0 | 368 | usb_stor_dbg(us, "Fail command during disconnect\n"); |
1da177e4 LT |
369 | srb->result = DID_NO_CONNECT << 16; |
370 | done(srb); | |
371 | return 0; | |
f45681f9 TA |
372 | } |
373 | ||
374 | if ((us->fflags & US_FL_NO_ATA_1X) && | |
375 | (srb->cmnd[0] == ATA_12 || srb->cmnd[0] == ATA_16)) { | |
376 | memcpy(srb->sense_buffer, usb_stor_sense_invalidCDB, | |
377 | sizeof(usb_stor_sense_invalidCDB)); | |
378 | srb->result = SAM_STAT_CHECK_CONDITION; | |
379 | done(srb); | |
380 | return 0; | |
1da177e4 LT |
381 | } |
382 | ||
383 | /* enqueue the command and wake up the control thread */ | |
1da177e4 | 384 | us->srb = srb; |
7119e3c3 | 385 | complete(&us->cmnd_ready); |
1da177e4 LT |
386 | |
387 | return 0; | |
388 | } | |
389 | ||
f281233d JG |
390 | static DEF_SCSI_QCMD(queuecommand) |
391 | ||
1da177e4 LT |
392 | /*********************************************************************** |
393 | * Error handling functions | |
394 | ***********************************************************************/ | |
395 | ||
396 | /* Command timeout and abort */ | |
a398d5ea | 397 | static int command_abort_matching(struct us_data *us, struct scsi_cmnd *srb_match) |
1da177e4 | 398 | { |
f0183a33 FB |
399 | /* |
400 | * us->srb together with the TIMED_OUT, RESETTING, and ABORTING | |
401 | * bits are protected by the host lock. | |
402 | */ | |
226173ed MD |
403 | scsi_lock(us_to_host(us)); |
404 | ||
a398d5ea MB |
405 | /* is there any active pending command to abort ? */ |
406 | if (!us->srb) { | |
226173ed | 407 | scsi_unlock(us_to_host(us)); |
191648d0 | 408 | usb_stor_dbg(us, "-- nothing to abort\n"); |
a398d5ea MB |
409 | return SUCCESS; |
410 | } | |
411 | ||
412 | /* Does the command match the passed srb if any ? */ | |
413 | if (srb_match && us->srb != srb_match) { | |
414 | scsi_unlock(us_to_host(us)); | |
415 | usb_stor_dbg(us, "-- pending command mismatch\n"); | |
1da177e4 LT |
416 | return FAILED; |
417 | } | |
418 | ||
f0183a33 FB |
419 | /* |
420 | * Set the TIMED_OUT bit. Also set the ABORTING bit, but only if | |
1da177e4 | 421 | * a device reset isn't already in progress (to avoid interfering |
226173ed MD |
422 | * with the reset). Note that we must retain the host lock while |
423 | * calling usb_stor_stop_transport(); otherwise it might interfere | |
f0183a33 FB |
424 | * with an auto-reset that begins as soon as we release the lock. |
425 | */ | |
7e4d6c38 AS |
426 | set_bit(US_FLIDX_TIMED_OUT, &us->dflags); |
427 | if (!test_bit(US_FLIDX_RESETTING, &us->dflags)) { | |
428 | set_bit(US_FLIDX_ABORTING, &us->dflags); | |
1da177e4 LT |
429 | usb_stor_stop_transport(us); |
430 | } | |
226173ed | 431 | scsi_unlock(us_to_host(us)); |
1da177e4 LT |
432 | |
433 | /* Wait for the aborted command to finish */ | |
434 | wait_for_completion(&us->notify); | |
1da177e4 LT |
435 | return SUCCESS; |
436 | } | |
437 | ||
a398d5ea MB |
438 | static int command_abort(struct scsi_cmnd *srb) |
439 | { | |
440 | struct us_data *us = host_to_us(srb->device->host); | |
441 | ||
442 | usb_stor_dbg(us, "%s called\n", __func__); | |
443 | return command_abort_matching(us, srb); | |
444 | } | |
445 | ||
f0183a33 FB |
446 | /* |
447 | * This invokes the transport reset mechanism to reset the state of the | |
448 | * device | |
449 | */ | |
1da177e4 LT |
450 | static int device_reset(struct scsi_cmnd *srb) |
451 | { | |
452 | struct us_data *us = host_to_us(srb->device->host); | |
453 | int result; | |
454 | ||
191648d0 | 455 | usb_stor_dbg(us, "%s called\n", __func__); |
1da177e4 | 456 | |
a398d5ea MB |
457 | /* abort any pending command before reset */ |
458 | command_abort_matching(us, NULL); | |
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); | |
70a79493 | 582 | struct queue_limits lim; |
1da177e4 | 583 | unsigned short ms; |
70a79493 | 584 | int ret; |
1da177e4 | 585 | |
70a79493 CH |
586 | if (sscanf(buf, "%hu", &ms) <= 0) |
587 | return -EINVAL; | |
588 | ||
589 | blk_mq_freeze_queue(sdev->request_queue); | |
590 | lim = queue_limits_start_update(sdev->request_queue); | |
591 | lim.max_hw_sectors = ms; | |
592 | ret = queue_limits_commit_update(sdev->request_queue, &lim); | |
593 | blk_mq_unfreeze_queue(sdev->request_queue); | |
594 | ||
595 | if (ret) | |
596 | return ret; | |
597 | return count; | |
1da177e4 | 598 | } |
f2e0ae93 | 599 | static DEVICE_ATTR_RW(max_sectors); |
1da177e4 | 600 | |
01e570fe BVA |
601 | static struct attribute *usb_sdev_attrs[] = { |
602 | &dev_attr_max_sectors.attr, | |
f2e0ae93 GKH |
603 | NULL, |
604 | }; | |
1da177e4 | 605 | |
01e570fe BVA |
606 | ATTRIBUTE_GROUPS(usb_sdev); |
607 | ||
1da177e4 LT |
608 | /* |
609 | * this defines our host template, with which we'll allocate hosts | |
610 | */ | |
611 | ||
aa519be3 | 612 | static const struct scsi_host_template usb_stor_host_template = { |
1da177e4 LT |
613 | /* basic userland interface stuff */ |
614 | .name = "usb-storage", | |
615 | .proc_name = "usb-storage", | |
09dae7fc AV |
616 | .show_info = show_info, |
617 | .write_info = write_info, | |
1da177e4 LT |
618 | .info = host_info, |
619 | ||
620 | /* command interface -- queued only */ | |
621 | .queuecommand = queuecommand, | |
622 | ||
623 | /* error and abort handlers */ | |
624 | .eh_abort_handler = command_abort, | |
625 | .eh_device_reset_handler = device_reset, | |
626 | .eh_bus_reset_handler = bus_reset, | |
627 | ||
628 | /* queue commands only, only one command per LUN */ | |
629 | .can_queue = 1, | |
1da177e4 LT |
630 | |
631 | /* unknown initiator id */ | |
632 | .this_id = -1, | |
633 | ||
634 | .slave_alloc = slave_alloc, | |
70a79493 | 635 | .device_configure = device_configure, |
09b6b51b | 636 | .target_alloc = target_alloc, |
1da177e4 LT |
637 | |
638 | /* lots of sg segments can be handled */ | |
65e8617f | 639 | .sg_tablesize = SG_MAX_SEGMENTS, |
1da177e4 | 640 | |
5b7dfbef CH |
641 | /* |
642 | * Some host controllers may have alignment requirements. | |
643 | * We'll play it safe by requiring 512-byte alignment always. | |
644 | */ | |
645 | .dma_alignment = 511, | |
779b457f FB |
646 | |
647 | /* | |
648 | * Limit the total size of a transfer to 120 KB. | |
649 | * | |
650 | * Some devices are known to choke with anything larger. It seems like | |
651 | * the problem stems from the fact that original IDE controllers had | |
652 | * only an 8-bit register to hold the number of sectors in one transfer | |
653 | * and even those couldn't handle a full 256 sectors. | |
654 | * | |
655 | * Because we want to make sure we interoperate with as many devices as | |
656 | * possible, we will maintain a 240 sector transfer size limit for USB | |
657 | * Mass Storage devices. | |
658 | * | |
659 | * Tests show that other operating have similar limits with Microsoft | |
660 | * Windows 7 limiting transfers to 128 sectors for both USB2 and USB3 | |
661 | * and Apple Mac OS X 10.11 limiting transfers to 256 sectors for USB2 | |
662 | * and 2048 for USB3 devices. | |
663 | */ | |
1da177e4 LT |
664 | .max_sectors = 240, |
665 | ||
1da177e4 LT |
666 | /* emulated HBA */ |
667 | .emulated = 1, | |
668 | ||
669 | /* we do our own delay after a device or bus reset */ | |
670 | .skip_settle_delay = 1, | |
671 | ||
672 | /* sysfs device attributes */ | |
01e570fe | 673 | .sdev_groups = usb_sdev_groups, |
1da177e4 LT |
674 | |
675 | /* module management */ | |
676 | .module = THIS_MODULE | |
677 | }; | |
678 | ||
aa519be3 AM |
679 | void usb_stor_host_template_init(struct scsi_host_template *sht, |
680 | const char *name, struct module *owner) | |
681 | { | |
682 | *sht = usb_stor_host_template; | |
683 | sht->name = name; | |
684 | sht->proc_name = name; | |
685 | sht->module = owner; | |
686 | } | |
687 | EXPORT_SYMBOL_GPL(usb_stor_host_template_init); | |
688 | ||
1da177e4 LT |
689 | /* To Report "Illegal Request: Invalid Field in CDB */ |
690 | unsigned char usb_stor_sense_invalidCDB[18] = { | |
691 | [0] = 0x70, /* current error */ | |
692 | [2] = ILLEGAL_REQUEST, /* Illegal Request = 0x05 */ | |
693 | [7] = 0x0a, /* additional length */ | |
694 | [12] = 0x24 /* Invalid Field in CDB */ | |
695 | }; | |
e6e244b6 | 696 | EXPORT_SYMBOL_GPL(usb_stor_sense_invalidCDB); |