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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" | |
bf89015a | 43 | #include <linux/usb/hcd.h> |
1da177e4 LT |
44 | #include "scsiglue.h" |
45 | #include "debug.h" | |
46 | #include "transport.h" | |
47 | #include "protocol.h" | |
48 | ||
f0183a33 FB |
49 | /* |
50 | * Vendor IDs for companies that seem to include the READ CAPACITY bug | |
a81a81a2 AS |
51 | * in all their devices |
52 | */ | |
53 | #define VENDOR_ID_NOKIA 0x0421 | |
54 | #define VENDOR_ID_NIKON 0x04b0 | |
506e9469 | 55 | #define VENDOR_ID_PENTAX 0x0a17 |
a81a81a2 AS |
56 | #define VENDOR_ID_MOTOROLA 0x22b8 |
57 | ||
1da177e4 LT |
58 | /*********************************************************************** |
59 | * Host functions | |
60 | ***********************************************************************/ | |
61 | ||
62 | static const char* host_info(struct Scsi_Host *host) | |
63 | { | |
00fa43ef MW |
64 | struct us_data *us = host_to_us(host); |
65 | return us->scsi_name; | |
1da177e4 LT |
66 | } |
67 | ||
68 | static int slave_alloc (struct scsi_device *sdev) | |
69 | { | |
823d12c9 AS |
70 | struct us_data *us = host_to_us(sdev->host); |
71 | ||
1da177e4 LT |
72 | /* |
73 | * Set the INQUIRY transfer length to 36. We don't use any of | |
74 | * the extra data and many devices choke if asked for more or | |
75 | * less than 36 bytes. | |
76 | */ | |
77 | sdev->inquiry_len = 36; | |
3a3416b1 | 78 | |
747668db AS |
79 | /* |
80 | * Some host controllers may have alignment requirements. | |
81 | * We'll play it safe by requiring 512-byte alignment always. | |
148d9fe4 | 82 | */ |
f756cbd4 | 83 | blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1)); |
465ff318 | 84 | |
823d12c9 AS |
85 | /* Tell the SCSI layer if we know there is more than one LUN */ |
86 | if (us->protocol == USB_PR_BULK && us->max_lun > 0) | |
87 | sdev->sdev_bflags |= BLIST_FORCELUN; | |
88 | ||
1da177e4 LT |
89 | return 0; |
90 | } | |
91 | ||
92 | static int slave_configure(struct scsi_device *sdev) | |
93 | { | |
94 | struct us_data *us = host_to_us(sdev->host); | |
97ad4a77 | 95 | struct device *dev = us->pusb_dev->bus->sysdev; |
1da177e4 | 96 | |
f0183a33 FB |
97 | /* |
98 | * Many devices have trouble transferring more than 32KB at a time, | |
883d989a PD |
99 | * while others have trouble with more than 64K. At this time we |
100 | * are limiting both to 32K (64 sectores). | |
101 | */ | |
7e4d6c38 | 102 | if (us->fflags & (US_FL_MAX_SECTORS_64 | US_FL_MAX_SECTORS_MIN)) { |
33abc04f DM |
103 | unsigned int max_sectors = 64; |
104 | ||
7e4d6c38 | 105 | if (us->fflags & US_FL_MAX_SECTORS_MIN) |
09cbfeaf | 106 | max_sectors = PAGE_SIZE >> 9; |
49d6271b | 107 | if (queue_max_hw_sectors(sdev->request_queue) > max_sectors) |
086fa5ff | 108 | blk_queue_max_hw_sectors(sdev->request_queue, |
33abc04f | 109 | max_sectors); |
5c16034d | 110 | } else if (sdev->type == TYPE_TAPE) { |
f0183a33 FB |
111 | /* |
112 | * Tapes need much higher max_sector limits, so just | |
5c16034d AS |
113 | * raise it to the maximum possible (4 GB / 512) and |
114 | * let the queue segment size sort out the real limit. | |
115 | */ | |
086fa5ff | 116 | blk_queue_max_hw_sectors(sdev->request_queue, 0x7FFFFF); |
5b91dfe1 | 117 | } else if (us->pusb_dev->speed >= USB_SPEED_SUPER) { |
f0183a33 FB |
118 | /* |
119 | * USB3 devices will be limited to 2048 sectors. This gives us | |
5b91dfe1 FB |
120 | * better throughput on most devices. |
121 | */ | |
122 | blk_queue_max_hw_sectors(sdev->request_queue, 2048); | |
33abc04f | 123 | } |
1da177e4 | 124 | |
d74ffae8 YS |
125 | /* |
126 | * The max_hw_sectors should be up to maximum size of a mapping for | |
127 | * the device. Otherwise, a DMA API might fail on swiotlb environment. | |
128 | */ | |
129 | blk_queue_max_hw_sectors(sdev->request_queue, | |
130 | min_t(size_t, queue_max_hw_sectors(sdev->request_queue), | |
131 | dma_max_mapping_size(dev) >> SECTOR_SHIFT)); | |
132 | ||
f0183a33 FB |
133 | /* |
134 | * Some USB host controllers can't do DMA; they have to use PIO. | |
bf89015a | 135 | * For such controllers we need to make sure the block layer sets |
96983d2d AS |
136 | * up bounce buffers in addressable memory. |
137 | */ | |
f8c63edf FN |
138 | if (!hcd_uses_dma(bus_to_hcd(us->pusb_dev->bus)) || |
139 | (bus_to_hcd(us->pusb_dev->bus)->localmem_pool != NULL)) | |
96983d2d AS |
140 | blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_HIGH); |
141 | ||
f0183a33 FB |
142 | /* |
143 | * We can't put these settings in slave_alloc() because that gets | |
1da177e4 | 144 | * called before the device type is known. Consequently these |
f0183a33 FB |
145 | * settings can't be overridden via the scsi devinfo mechanism. |
146 | */ | |
1da177e4 LT |
147 | if (sdev->type == TYPE_DISK) { |
148 | ||
f0183a33 FB |
149 | /* |
150 | * Some vendors seem to put the READ CAPACITY bug into | |
a81a81a2 AS |
151 | * all their devices -- primarily makers of cell phones |
152 | * and digital cameras. Since these devices always use | |
153 | * flash media and can be expected to have an even number | |
154 | * of sectors, we will always enable the CAPACITY_HEURISTICS | |
f0183a33 FB |
155 | * flag unless told otherwise. |
156 | */ | |
a81a81a2 AS |
157 | switch (le16_to_cpu(us->pusb_dev->descriptor.idVendor)) { |
158 | case VENDOR_ID_NOKIA: | |
159 | case VENDOR_ID_NIKON: | |
506e9469 | 160 | case VENDOR_ID_PENTAX: |
a81a81a2 AS |
161 | case VENDOR_ID_MOTOROLA: |
162 | if (!(us->fflags & (US_FL_FIX_CAPACITY | | |
163 | US_FL_CAPACITY_OK))) | |
164 | us->fflags |= US_FL_CAPACITY_HEURISTICS; | |
165 | break; | |
166 | } | |
167 | ||
f0183a33 FB |
168 | /* |
169 | * Disk-type devices use MODE SENSE(6) if the protocol | |
1da177e4 | 170 | * (SubClass) is Transparent SCSI, otherwise they use |
f0183a33 FB |
171 | * MODE SENSE(10). |
172 | */ | |
8fa7fd74 | 173 | if (us->subclass != USB_SC_SCSI && us->subclass != USB_SC_CYP_ATACB) |
1da177e4 LT |
174 | sdev->use_10_for_ms = 1; |
175 | ||
f0183a33 FB |
176 | /* |
177 | *Many disks only accept MODE SENSE transfer lengths of | |
178 | * 192 bytes (that's what Windows uses). | |
179 | */ | |
1da177e4 LT |
180 | sdev->use_192_bytes_for_3f = 1; |
181 | ||
f0183a33 FB |
182 | /* |
183 | * Some devices don't like MODE SENSE with page=0x3f, | |
1da177e4 LT |
184 | * which is the command used for checking if a device |
185 | * is write-protected. Now that we tell the sd driver | |
186 | * to do a 192-byte transfer with this command the | |
187 | * majority of devices work fine, but a few still can't | |
188 | * handle it. The sd driver will simply assume those | |
f0183a33 FB |
189 | * devices are write-enabled. |
190 | */ | |
7e4d6c38 | 191 | if (us->fflags & US_FL_NO_WP_DETECT) |
1da177e4 LT |
192 | sdev->skip_ms_page_3f = 1; |
193 | ||
f0183a33 FB |
194 | /* |
195 | * A number of devices have problems with MODE SENSE for | |
196 | * page x08, so we will skip it. | |
197 | */ | |
1da177e4 LT |
198 | sdev->skip_ms_page_8 = 1; |
199 | ||
34914878 MPS |
200 | /* |
201 | * Some devices don't handle VPD pages correctly, so skip vpd | |
202 | * pages if not forced by SCSI layer. | |
203 | */ | |
204 | sdev->skip_vpd_pages = !sdev->try_vpd_pages; | |
09b6b51b | 205 | |
3c6bdaea MP |
206 | /* Do not attempt to use REPORT SUPPORTED OPERATION CODES */ |
207 | sdev->no_report_opcodes = 1; | |
208 | ||
5db44863 MP |
209 | /* Do not attempt to use WRITE SAME */ |
210 | sdev->no_write_same = 1; | |
211 | ||
f0183a33 FB |
212 | /* |
213 | * Some disks return the total number of blocks in response | |
1da177e4 | 214 | * to READ CAPACITY rather than the highest block number. |
f0183a33 FB |
215 | * If this device makes that mistake, tell the sd driver. |
216 | */ | |
7e4d6c38 | 217 | if (us->fflags & US_FL_FIX_CAPACITY) |
1da177e4 | 218 | sdev->fix_capacity = 1; |
86dbde9c | 219 | |
f0183a33 FB |
220 | /* |
221 | * A few disks have two indistinguishable version, one of | |
61bf54b7 | 222 | * which reports the correct capacity and the other does not. |
f0183a33 FB |
223 | * The sd driver has to guess which is the case. |
224 | */ | |
7e4d6c38 | 225 | if (us->fflags & US_FL_CAPACITY_HEURISTICS) |
61bf54b7 ON |
226 | sdev->guess_capacity = 1; |
227 | ||
00914025 HG |
228 | /* Some devices cannot handle READ_CAPACITY_16 */ |
229 | if (us->fflags & US_FL_NO_READ_CAPACITY_16) | |
230 | sdev->no_read_capacity_16 = 1; | |
231 | ||
6a0bdffa AS |
232 | /* |
233 | * Many devices do not respond properly to READ_CAPACITY_16. | |
234 | * Tell the SCSI layer to try READ_CAPACITY_10 first. | |
32c37fc3 ON |
235 | * However some USB 3.0 drive enclosures return capacity |
236 | * modulo 2TB. Those must use READ_CAPACITY_16 | |
6a0bdffa | 237 | */ |
32c37fc3 ON |
238 | if (!(us->fflags & US_FL_NEEDS_CAP16)) |
239 | sdev->try_rc_10_first = 1; | |
6a0bdffa | 240 | |
c5603d2f IZ |
241 | /* |
242 | * assume SPC3 or latter devices support sense size > 18 | |
243 | * unless US_FL_BAD_SENSE quirk is specified. | |
244 | */ | |
245 | if (sdev->scsi_level > SCSI_SPC_2 && | |
246 | !(us->fflags & US_FL_BAD_SENSE)) | |
1537e0ad BE |
247 | us->fflags |= US_FL_SANE_SENSE; |
248 | ||
f0183a33 FB |
249 | /* |
250 | * USB-IDE bridges tend to report SK = 0x04 (Non-recoverable | |
86dbde9c MD |
251 | * Hardware Error) when any low-level error occurs, |
252 | * recoverable or not. Setting this flag tells the SCSI | |
253 | * midlayer to retry such commands, which frequently will | |
254 | * succeed and fix the error. The worst this can lead to | |
f0183a33 FB |
255 | * is an occasional series of retries that will all fail. |
256 | */ | |
86dbde9c MD |
257 | sdev->retry_hwerror = 1; |
258 | ||
f0183a33 FB |
259 | /* |
260 | * USB disks should allow restart. Some drives spin down | |
261 | * automatically, requiring a START-STOP UNIT command. | |
262 | */ | |
f09e495d MCC |
263 | sdev->allow_restart = 1; |
264 | ||
f0183a33 FB |
265 | /* |
266 | * Some USB cardreaders have trouble reading an sdcard's last | |
23c3e290 | 267 | * sector in a larger then 1 sector read, since the performance |
f0183a33 FB |
268 | * impact is negligible we set this flag for all USB disks |
269 | */ | |
23c3e290 | 270 | sdev->last_sector_bug = 1; |
25ff1c31 | 271 | |
f0183a33 FB |
272 | /* |
273 | * Enable last-sector hacks for single-target devices using | |
25ff1c31 | 274 | * the Bulk-only transport, unless we already know the |
f0183a33 FB |
275 | * capacity will be decremented or is correct. |
276 | */ | |
25ff1c31 AS |
277 | if (!(us->fflags & (US_FL_FIX_CAPACITY | US_FL_CAPACITY_OK | |
278 | US_FL_SCM_MULT_TARG)) && | |
8fa7fd74 | 279 | us->protocol == USB_PR_BULK) |
25ff1c31 | 280 | us->use_last_sector_hacks = 1; |
eaa05dfc NJ |
281 | |
282 | /* Check if write cache default on flag is set or not */ | |
283 | if (us->fflags & US_FL_WRITE_CACHE) | |
284 | sdev->wce_default_on = 1; | |
285 | ||
b14bf2d0 AS |
286 | /* A few buggy USB-ATA bridges don't understand FUA */ |
287 | if (us->fflags & US_FL_BROKEN_FUA) | |
288 | sdev->broken_fua = 1; | |
289 | ||
050bc4e8 ON |
290 | /* Some even totally fail to indicate a cache */ |
291 | if (us->fflags & US_FL_ALWAYS_SYNC) { | |
292 | /* don't read caching information */ | |
293 | sdev->skip_ms_page_8 = 1; | |
294 | sdev->skip_ms_page_3f = 1; | |
295 | /* assume sync is needed */ | |
296 | sdev->wce_default_on = 1; | |
297 | } | |
1da177e4 LT |
298 | } else { |
299 | ||
f0183a33 | 300 | /* |
19246d27 | 301 | * Non-disk-type devices don't need to ignore any pages |
1da177e4 | 302 | * or to force 192-byte transfer lengths for MODE SENSE. |
f0183a33 FB |
303 | * But they do need to use MODE SENSE(10). |
304 | */ | |
1da177e4 | 305 | sdev->use_10_for_ms = 1; |
ae38c78a HG |
306 | |
307 | /* Some (fake) usb cdrom devices don't like READ_DISC_INFO */ | |
308 | if (us->fflags & US_FL_NO_READ_DISC_INFO) | |
309 | sdev->no_read_disc_info = 1; | |
1da177e4 LT |
310 | } |
311 | ||
f0183a33 FB |
312 | /* |
313 | * The CB and CBI transports have no way to pass LUN values | |
f3f49065 AS |
314 | * other than the bits in the second byte of a CDB. But those |
315 | * bits don't get set to the LUN value if the device reports | |
316 | * scsi_level == 0 (UNKNOWN). Hence such devices must necessarily | |
317 | * be single-LUN. | |
318 | */ | |
8fa7fd74 | 319 | if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_CBI) && |
f3f49065 AS |
320 | sdev->scsi_level == SCSI_UNKNOWN) |
321 | us->max_lun = 0; | |
322 | ||
f0183a33 FB |
323 | /* |
324 | * Some devices choke when they receive a PREVENT-ALLOW MEDIUM | |
325 | * REMOVAL command, so suppress those commands. | |
326 | */ | |
7e4d6c38 | 327 | if (us->fflags & US_FL_NOT_LOCKABLE) |
1da177e4 LT |
328 | sdev->lockable = 0; |
329 | ||
f0183a33 FB |
330 | /* |
331 | * this is to satisfy the compiler, tho I don't think the | |
332 | * return code is ever checked anywhere. | |
333 | */ | |
1da177e4 LT |
334 | return 0; |
335 | } | |
336 | ||
09b6b51b AS |
337 | static int target_alloc(struct scsi_target *starget) |
338 | { | |
af74d2da AS |
339 | struct us_data *us = host_to_us(dev_to_shost(starget->dev.parent)); |
340 | ||
09b6b51b AS |
341 | /* |
342 | * Some USB drives don't support REPORT LUNS, even though they | |
343 | * report a SCSI revision level above 2. Tell the SCSI layer | |
344 | * not to issue that command; it will perform a normal sequential | |
345 | * scan instead. | |
346 | */ | |
347 | starget->no_report_luns = 1; | |
af74d2da AS |
348 | |
349 | /* | |
350 | * The UFI spec treats the Peripheral Qualifier bits in an | |
351 | * INQUIRY result as reserved and requires devices to set them | |
352 | * to 0. However the SCSI spec requires these bits to be set | |
353 | * to 3 to indicate when a LUN is not present. | |
354 | * | |
355 | * Let the scanning code know if this target merely sets | |
356 | * Peripheral Device Type to 0x1f to indicate no LUN. | |
357 | */ | |
358 | if (us->subclass == USB_SC_UFI) | |
359 | starget->pdt_1f_for_no_lun = 1; | |
360 | ||
09b6b51b AS |
361 | return 0; |
362 | } | |
363 | ||
1da177e4 LT |
364 | /* queue a command */ |
365 | /* This is always called with scsi_lock(host) held */ | |
f281233d | 366 | static int queuecommand_lck(struct scsi_cmnd *srb, |
1da177e4 LT |
367 | void (*done)(struct scsi_cmnd *)) |
368 | { | |
369 | struct us_data *us = host_to_us(srb->device->host); | |
370 | ||
1da177e4 LT |
371 | /* check for state-transition errors */ |
372 | if (us->srb != NULL) { | |
3055c92c MM |
373 | dev_err(&us->pusb_intf->dev, |
374 | "Error in %s: us->srb = %p\n", __func__, us->srb); | |
1da177e4 LT |
375 | return SCSI_MLQUEUE_HOST_BUSY; |
376 | } | |
377 | ||
378 | /* fail the command if we are disconnecting */ | |
7e4d6c38 | 379 | if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { |
191648d0 | 380 | usb_stor_dbg(us, "Fail command during disconnect\n"); |
1da177e4 LT |
381 | srb->result = DID_NO_CONNECT << 16; |
382 | done(srb); | |
383 | return 0; | |
f45681f9 TA |
384 | } |
385 | ||
386 | if ((us->fflags & US_FL_NO_ATA_1X) && | |
387 | (srb->cmnd[0] == ATA_12 || srb->cmnd[0] == ATA_16)) { | |
388 | memcpy(srb->sense_buffer, usb_stor_sense_invalidCDB, | |
389 | sizeof(usb_stor_sense_invalidCDB)); | |
390 | srb->result = SAM_STAT_CHECK_CONDITION; | |
391 | done(srb); | |
392 | return 0; | |
1da177e4 LT |
393 | } |
394 | ||
395 | /* enqueue the command and wake up the control thread */ | |
396 | srb->scsi_done = done; | |
397 | us->srb = srb; | |
7119e3c3 | 398 | complete(&us->cmnd_ready); |
1da177e4 LT |
399 | |
400 | return 0; | |
401 | } | |
402 | ||
f281233d JG |
403 | static DEF_SCSI_QCMD(queuecommand) |
404 | ||
1da177e4 LT |
405 | /*********************************************************************** |
406 | * Error handling functions | |
407 | ***********************************************************************/ | |
408 | ||
409 | /* Command timeout and abort */ | |
1da177e4 LT |
410 | static int command_abort(struct scsi_cmnd *srb) |
411 | { | |
412 | struct us_data *us = host_to_us(srb->device->host); | |
413 | ||
191648d0 | 414 | usb_stor_dbg(us, "%s called\n", __func__); |
1da177e4 | 415 | |
f0183a33 FB |
416 | /* |
417 | * us->srb together with the TIMED_OUT, RESETTING, and ABORTING | |
418 | * bits are protected by the host lock. | |
419 | */ | |
226173ed MD |
420 | scsi_lock(us_to_host(us)); |
421 | ||
1da177e4 LT |
422 | /* Is this command still active? */ |
423 | if (us->srb != srb) { | |
226173ed | 424 | scsi_unlock(us_to_host(us)); |
191648d0 | 425 | usb_stor_dbg(us, "-- nothing to abort\n"); |
1da177e4 LT |
426 | return FAILED; |
427 | } | |
428 | ||
f0183a33 FB |
429 | /* |
430 | * Set the TIMED_OUT bit. Also set the ABORTING bit, but only if | |
1da177e4 | 431 | * a device reset isn't already in progress (to avoid interfering |
226173ed MD |
432 | * with the reset). Note that we must retain the host lock while |
433 | * calling usb_stor_stop_transport(); otherwise it might interfere | |
f0183a33 FB |
434 | * with an auto-reset that begins as soon as we release the lock. |
435 | */ | |
7e4d6c38 AS |
436 | set_bit(US_FLIDX_TIMED_OUT, &us->dflags); |
437 | if (!test_bit(US_FLIDX_RESETTING, &us->dflags)) { | |
438 | set_bit(US_FLIDX_ABORTING, &us->dflags); | |
1da177e4 LT |
439 | usb_stor_stop_transport(us); |
440 | } | |
226173ed | 441 | scsi_unlock(us_to_host(us)); |
1da177e4 LT |
442 | |
443 | /* Wait for the aborted command to finish */ | |
444 | wait_for_completion(&us->notify); | |
1da177e4 LT |
445 | return SUCCESS; |
446 | } | |
447 | ||
f0183a33 FB |
448 | /* |
449 | * This invokes the transport reset mechanism to reset the state of the | |
450 | * device | |
451 | */ | |
1da177e4 LT |
452 | static int device_reset(struct scsi_cmnd *srb) |
453 | { | |
454 | struct us_data *us = host_to_us(srb->device->host); | |
455 | int result; | |
456 | ||
191648d0 | 457 | usb_stor_dbg(us, "%s called\n", __func__); |
1da177e4 | 458 | |
d526875d GKH |
459 | /* lock the device pointers and do the reset */ |
460 | mutex_lock(&(us->dev_mutex)); | |
461 | result = us->transport_reset(us); | |
462 | mutex_unlock(&us->dev_mutex); | |
1da177e4 | 463 | |
4d07ef76 | 464 | return result < 0 ? FAILED : SUCCESS; |
1da177e4 LT |
465 | } |
466 | ||
4d07ef76 | 467 | /* Simulate a SCSI bus reset by resetting the device's USB port. */ |
1da177e4 LT |
468 | static int bus_reset(struct scsi_cmnd *srb) |
469 | { | |
470 | struct us_data *us = host_to_us(srb->device->host); | |
4d07ef76 | 471 | int result; |
1da177e4 | 472 | |
191648d0 JP |
473 | usb_stor_dbg(us, "%s called\n", __func__); |
474 | ||
4d07ef76 | 475 | result = usb_stor_port_reset(us); |
1da177e4 LT |
476 | return result < 0 ? FAILED : SUCCESS; |
477 | } | |
478 | ||
f0183a33 FB |
479 | /* |
480 | * Report a driver-initiated device reset to the SCSI layer. | |
1da177e4 | 481 | * Calling this for a SCSI-initiated reset is unnecessary but harmless. |
f0183a33 FB |
482 | * The caller must own the SCSI host lock. |
483 | */ | |
1da177e4 LT |
484 | void usb_stor_report_device_reset(struct us_data *us) |
485 | { | |
486 | int i; | |
487 | struct Scsi_Host *host = us_to_host(us); | |
488 | ||
489 | scsi_report_device_reset(host, 0, 0); | |
7e4d6c38 | 490 | if (us->fflags & US_FL_SCM_MULT_TARG) { |
1da177e4 LT |
491 | for (i = 1; i < host->max_id; ++i) |
492 | scsi_report_device_reset(host, 0, i); | |
493 | } | |
494 | } | |
495 | ||
f0183a33 FB |
496 | /* |
497 | * Report a driver-initiated bus reset to the SCSI layer. | |
4d07ef76 | 498 | * Calling this for a SCSI-initiated reset is unnecessary but harmless. |
f0183a33 FB |
499 | * The caller must not own the SCSI host lock. |
500 | */ | |
4d07ef76 MD |
501 | void usb_stor_report_bus_reset(struct us_data *us) |
502 | { | |
f07600cf AS |
503 | struct Scsi_Host *host = us_to_host(us); |
504 | ||
505 | scsi_lock(host); | |
506 | scsi_report_bus_reset(host, 0); | |
507 | scsi_unlock(host); | |
4d07ef76 MD |
508 | } |
509 | ||
1da177e4 LT |
510 | /*********************************************************************** |
511 | * /proc/scsi/ functions | |
512 | ***********************************************************************/ | |
513 | ||
09dae7fc AV |
514 | static int write_info(struct Scsi_Host *host, char *buffer, int length) |
515 | { | |
516 | /* if someone is sending us data, just throw it away */ | |
517 | return length; | |
518 | } | |
519 | ||
09dae7fc | 520 | static int show_info (struct seq_file *m, struct Scsi_Host *host) |
1da177e4 LT |
521 | { |
522 | struct us_data *us = host_to_us(host); | |
1da177e4 LT |
523 | const char *string; |
524 | ||
1da177e4 | 525 | /* print the controller name */ |
7d203a9e | 526 | seq_printf(m, " Host scsi%d: usb-storage\n", host->host_no); |
1da177e4 LT |
527 | |
528 | /* print product, vendor, and serial number strings */ | |
529 | if (us->pusb_dev->manufacturer) | |
530 | string = us->pusb_dev->manufacturer; | |
531 | else if (us->unusual_dev->vendorName) | |
532 | string = us->unusual_dev->vendorName; | |
533 | else | |
534 | string = "Unknown"; | |
7d203a9e | 535 | seq_printf(m, " Vendor: %s\n", string); |
1da177e4 LT |
536 | if (us->pusb_dev->product) |
537 | string = us->pusb_dev->product; | |
538 | else if (us->unusual_dev->productName) | |
539 | string = us->unusual_dev->productName; | |
540 | else | |
541 | string = "Unknown"; | |
7d203a9e | 542 | seq_printf(m, " Product: %s\n", string); |
1da177e4 LT |
543 | if (us->pusb_dev->serial) |
544 | string = us->pusb_dev->serial; | |
545 | else | |
546 | string = "None"; | |
7d203a9e | 547 | seq_printf(m, "Serial Number: %s\n", string); |
1da177e4 LT |
548 | |
549 | /* show the protocol and transport */ | |
7d203a9e JP |
550 | seq_printf(m, " Protocol: %s\n", us->protocol_name); |
551 | seq_printf(m, " Transport: %s\n", us->transport_name); | |
1da177e4 LT |
552 | |
553 | /* show the device flags */ | |
7d203a9e | 554 | seq_printf(m, " Quirks:"); |
1da177e4 LT |
555 | |
556 | #define US_FLAG(name, value) \ | |
09dae7fc | 557 | if (us->fflags & value) seq_printf(m, " " #name); |
1da177e4 LT |
558 | US_DO_ALL_FLAGS |
559 | #undef US_FLAG | |
09dae7fc AV |
560 | seq_putc(m, '\n'); |
561 | return 0; | |
1da177e4 LT |
562 | } |
563 | ||
564 | /*********************************************************************** | |
565 | * Sysfs interface | |
566 | ***********************************************************************/ | |
567 | ||
568 | /* Output routine for the sysfs max_sectors file */ | |
f2e0ae93 | 569 | static ssize_t max_sectors_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
570 | { |
571 | struct scsi_device *sdev = to_scsi_device(dev); | |
572 | ||
49d6271b | 573 | return sprintf(buf, "%u\n", queue_max_hw_sectors(sdev->request_queue)); |
1da177e4 LT |
574 | } |
575 | ||
576 | /* Input routine for the sysfs max_sectors file */ | |
f2e0ae93 | 577 | static ssize_t max_sectors_store(struct device *dev, struct device_attribute *attr, const char *buf, |
1da177e4 LT |
578 | size_t count) |
579 | { | |
580 | struct scsi_device *sdev = to_scsi_device(dev); | |
581 | unsigned short ms; | |
582 | ||
49d6271b | 583 | if (sscanf(buf, "%hu", &ms) > 0) { |
086fa5ff | 584 | blk_queue_max_hw_sectors(sdev->request_queue, ms); |
49d6271b | 585 | return count; |
1da177e4 | 586 | } |
f2e0ae93 | 587 | return -EINVAL; |
1da177e4 | 588 | } |
f2e0ae93 | 589 | static DEVICE_ATTR_RW(max_sectors); |
1da177e4 LT |
590 | |
591 | static struct device_attribute *sysfs_device_attr_list[] = { | |
f2e0ae93 GKH |
592 | &dev_attr_max_sectors, |
593 | NULL, | |
594 | }; | |
1da177e4 LT |
595 | |
596 | /* | |
597 | * this defines our host template, with which we'll allocate hosts | |
598 | */ | |
599 | ||
aa519be3 | 600 | static const struct scsi_host_template usb_stor_host_template = { |
1da177e4 LT |
601 | /* basic userland interface stuff */ |
602 | .name = "usb-storage", | |
603 | .proc_name = "usb-storage", | |
09dae7fc AV |
604 | .show_info = show_info, |
605 | .write_info = write_info, | |
1da177e4 LT |
606 | .info = host_info, |
607 | ||
608 | /* command interface -- queued only */ | |
609 | .queuecommand = queuecommand, | |
610 | ||
611 | /* error and abort handlers */ | |
612 | .eh_abort_handler = command_abort, | |
613 | .eh_device_reset_handler = device_reset, | |
614 | .eh_bus_reset_handler = bus_reset, | |
615 | ||
616 | /* queue commands only, only one command per LUN */ | |
617 | .can_queue = 1, | |
1da177e4 LT |
618 | |
619 | /* unknown initiator id */ | |
620 | .this_id = -1, | |
621 | ||
622 | .slave_alloc = slave_alloc, | |
623 | .slave_configure = slave_configure, | |
09b6b51b | 624 | .target_alloc = target_alloc, |
1da177e4 LT |
625 | |
626 | /* lots of sg segments can be handled */ | |
65e8617f | 627 | .sg_tablesize = SG_MAX_SEGMENTS, |
1da177e4 | 628 | |
779b457f FB |
629 | |
630 | /* | |
631 | * Limit the total size of a transfer to 120 KB. | |
632 | * | |
633 | * Some devices are known to choke with anything larger. It seems like | |
634 | * the problem stems from the fact that original IDE controllers had | |
635 | * only an 8-bit register to hold the number of sectors in one transfer | |
636 | * and even those couldn't handle a full 256 sectors. | |
637 | * | |
638 | * Because we want to make sure we interoperate with as many devices as | |
639 | * possible, we will maintain a 240 sector transfer size limit for USB | |
640 | * Mass Storage devices. | |
641 | * | |
642 | * Tests show that other operating have similar limits with Microsoft | |
643 | * Windows 7 limiting transfers to 128 sectors for both USB2 and USB3 | |
644 | * and Apple Mac OS X 10.11 limiting transfers to 256 sectors for USB2 | |
645 | * and 2048 for USB3 devices. | |
646 | */ | |
1da177e4 LT |
647 | .max_sectors = 240, |
648 | ||
1da177e4 LT |
649 | /* emulated HBA */ |
650 | .emulated = 1, | |
651 | ||
652 | /* we do our own delay after a device or bus reset */ | |
653 | .skip_settle_delay = 1, | |
654 | ||
655 | /* sysfs device attributes */ | |
656 | .sdev_attrs = sysfs_device_attr_list, | |
657 | ||
658 | /* module management */ | |
659 | .module = THIS_MODULE | |
660 | }; | |
661 | ||
aa519be3 AM |
662 | void usb_stor_host_template_init(struct scsi_host_template *sht, |
663 | const char *name, struct module *owner) | |
664 | { | |
665 | *sht = usb_stor_host_template; | |
666 | sht->name = name; | |
667 | sht->proc_name = name; | |
668 | sht->module = owner; | |
669 | } | |
670 | EXPORT_SYMBOL_GPL(usb_stor_host_template_init); | |
671 | ||
1da177e4 LT |
672 | /* To Report "Illegal Request: Invalid Field in CDB */ |
673 | unsigned char usb_stor_sense_invalidCDB[18] = { | |
674 | [0] = 0x70, /* current error */ | |
675 | [2] = ILLEGAL_REQUEST, /* Illegal Request = 0x05 */ | |
676 | [7] = 0x0a, /* additional length */ | |
677 | [12] = 0x24 /* Invalid Field in CDB */ | |
678 | }; | |
e6e244b6 | 679 | EXPORT_SYMBOL_GPL(usb_stor_sense_invalidCDB); |