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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 | ||
1da177e4 | 31 | #include <linux/module.h> |
4186ecf8 | 32 | #include <linux/mutex.h> |
1da177e4 LT |
33 | |
34 | #include <scsi/scsi.h> | |
35 | #include <scsi/scsi_cmnd.h> | |
36 | #include <scsi/scsi_devinfo.h> | |
37 | #include <scsi/scsi_device.h> | |
38 | #include <scsi/scsi_eh.h> | |
39 | ||
40 | #include "usb.h" | |
41 | #include "scsiglue.h" | |
42 | #include "debug.h" | |
43 | #include "transport.h" | |
44 | #include "protocol.h" | |
45 | ||
f0183a33 FB |
46 | /* |
47 | * Vendor IDs for companies that seem to include the READ CAPACITY bug | |
a81a81a2 AS |
48 | * in all their devices |
49 | */ | |
50 | #define VENDOR_ID_NOKIA 0x0421 | |
51 | #define VENDOR_ID_NIKON 0x04b0 | |
506e9469 | 52 | #define VENDOR_ID_PENTAX 0x0a17 |
a81a81a2 AS |
53 | #define VENDOR_ID_MOTOROLA 0x22b8 |
54 | ||
1da177e4 LT |
55 | /*********************************************************************** |
56 | * Host functions | |
57 | ***********************************************************************/ | |
58 | ||
59 | static const char* host_info(struct Scsi_Host *host) | |
60 | { | |
00fa43ef MW |
61 | struct us_data *us = host_to_us(host); |
62 | return us->scsi_name; | |
1da177e4 LT |
63 | } |
64 | ||
65 | static int slave_alloc (struct scsi_device *sdev) | |
66 | { | |
823d12c9 AS |
67 | struct us_data *us = host_to_us(sdev->host); |
68 | ||
1da177e4 LT |
69 | /* |
70 | * Set the INQUIRY transfer length to 36. We don't use any of | |
71 | * the extra data and many devices choke if asked for more or | |
72 | * less than 36 bytes. | |
73 | */ | |
74 | sdev->inquiry_len = 36; | |
3a3416b1 | 75 | |
f0183a33 FB |
76 | /* |
77 | * USB has unusual DMA-alignment requirements: Although the | |
f756cbd4 AS |
78 | * starting address of each scatter-gather element doesn't matter, |
79 | * the length of each element except the last must be divisible | |
80 | * by the Bulk maxpacket value. There's currently no way to | |
81 | * express this by block-layer constraints, so we'll cop out | |
82 | * and simply require addresses to be aligned at 512-byte | |
83 | * boundaries. This is okay since most block I/O involves | |
84 | * hardware sectors that are multiples of 512 bytes in length, | |
85 | * and since host controllers up through USB 2.0 have maxpacket | |
86 | * values no larger than 512. | |
87 | * | |
88 | * But it doesn't suffice for Wireless USB, where Bulk maxpacket | |
89 | * values can be as large as 2048. To make that work properly | |
90 | * will require changes to the block layer. | |
148d9fe4 | 91 | */ |
f756cbd4 | 92 | blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1)); |
465ff318 | 93 | |
823d12c9 AS |
94 | /* Tell the SCSI layer if we know there is more than one LUN */ |
95 | if (us->protocol == USB_PR_BULK && us->max_lun > 0) | |
96 | sdev->sdev_bflags |= BLIST_FORCELUN; | |
97 | ||
1da177e4 LT |
98 | return 0; |
99 | } | |
100 | ||
101 | static int slave_configure(struct scsi_device *sdev) | |
102 | { | |
103 | struct us_data *us = host_to_us(sdev->host); | |
104 | ||
f0183a33 FB |
105 | /* |
106 | * Many devices have trouble transferring more than 32KB at a time, | |
883d989a PD |
107 | * while others have trouble with more than 64K. At this time we |
108 | * are limiting both to 32K (64 sectores). | |
109 | */ | |
7e4d6c38 | 110 | if (us->fflags & (US_FL_MAX_SECTORS_64 | US_FL_MAX_SECTORS_MIN)) { |
33abc04f DM |
111 | unsigned int max_sectors = 64; |
112 | ||
7e4d6c38 | 113 | if (us->fflags & US_FL_MAX_SECTORS_MIN) |
09cbfeaf | 114 | max_sectors = PAGE_SIZE >> 9; |
49d6271b | 115 | if (queue_max_hw_sectors(sdev->request_queue) > max_sectors) |
086fa5ff | 116 | blk_queue_max_hw_sectors(sdev->request_queue, |
33abc04f | 117 | max_sectors); |
5c16034d | 118 | } else if (sdev->type == TYPE_TAPE) { |
f0183a33 FB |
119 | /* |
120 | * Tapes need much higher max_sector limits, so just | |
5c16034d AS |
121 | * raise it to the maximum possible (4 GB / 512) and |
122 | * let the queue segment size sort out the real limit. | |
123 | */ | |
086fa5ff | 124 | blk_queue_max_hw_sectors(sdev->request_queue, 0x7FFFFF); |
5b91dfe1 | 125 | } else if (us->pusb_dev->speed >= USB_SPEED_SUPER) { |
f0183a33 FB |
126 | /* |
127 | * USB3 devices will be limited to 2048 sectors. This gives us | |
5b91dfe1 FB |
128 | * better throughput on most devices. |
129 | */ | |
130 | blk_queue_max_hw_sectors(sdev->request_queue, 2048); | |
33abc04f | 131 | } |
1da177e4 | 132 | |
f0183a33 FB |
133 | /* |
134 | * Some USB host controllers can't do DMA; they have to use PIO. | |
96983d2d AS |
135 | * They indicate this by setting their dma_mask to NULL. For |
136 | * such controllers we need to make sure the block layer sets | |
137 | * up bounce buffers in addressable memory. | |
138 | */ | |
139 | if (!us->pusb_dev->bus->controller->dma_mask) | |
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 | ||
09b6b51b AS |
200 | /* Some devices don't handle VPD pages correctly */ |
201 | sdev->skip_vpd_pages = 1; | |
202 | ||
3c6bdaea MP |
203 | /* Do not attempt to use REPORT SUPPORTED OPERATION CODES */ |
204 | sdev->no_report_opcodes = 1; | |
205 | ||
5db44863 MP |
206 | /* Do not attempt to use WRITE SAME */ |
207 | sdev->no_write_same = 1; | |
208 | ||
f0183a33 FB |
209 | /* |
210 | * Some disks return the total number of blocks in response | |
1da177e4 | 211 | * to READ CAPACITY rather than the highest block number. |
f0183a33 FB |
212 | * If this device makes that mistake, tell the sd driver. |
213 | */ | |
7e4d6c38 | 214 | if (us->fflags & US_FL_FIX_CAPACITY) |
1da177e4 | 215 | sdev->fix_capacity = 1; |
86dbde9c | 216 | |
f0183a33 FB |
217 | /* |
218 | * A few disks have two indistinguishable version, one of | |
61bf54b7 | 219 | * which reports the correct capacity and the other does not. |
f0183a33 FB |
220 | * The sd driver has to guess which is the case. |
221 | */ | |
7e4d6c38 | 222 | if (us->fflags & US_FL_CAPACITY_HEURISTICS) |
61bf54b7 ON |
223 | sdev->guess_capacity = 1; |
224 | ||
00914025 HG |
225 | /* Some devices cannot handle READ_CAPACITY_16 */ |
226 | if (us->fflags & US_FL_NO_READ_CAPACITY_16) | |
227 | sdev->no_read_capacity_16 = 1; | |
228 | ||
6a0bdffa AS |
229 | /* |
230 | * Many devices do not respond properly to READ_CAPACITY_16. | |
231 | * Tell the SCSI layer to try READ_CAPACITY_10 first. | |
32c37fc3 ON |
232 | * However some USB 3.0 drive enclosures return capacity |
233 | * modulo 2TB. Those must use READ_CAPACITY_16 | |
6a0bdffa | 234 | */ |
32c37fc3 ON |
235 | if (!(us->fflags & US_FL_NEEDS_CAP16)) |
236 | sdev->try_rc_10_first = 1; | |
6a0bdffa | 237 | |
1537e0ad BE |
238 | /* assume SPC3 or latter devices support sense size > 18 */ |
239 | if (sdev->scsi_level > SCSI_SPC_2) | |
240 | us->fflags |= US_FL_SANE_SENSE; | |
241 | ||
f0183a33 FB |
242 | /* |
243 | * USB-IDE bridges tend to report SK = 0x04 (Non-recoverable | |
86dbde9c MD |
244 | * Hardware Error) when any low-level error occurs, |
245 | * recoverable or not. Setting this flag tells the SCSI | |
246 | * midlayer to retry such commands, which frequently will | |
247 | * succeed and fix the error. The worst this can lead to | |
f0183a33 FB |
248 | * is an occasional series of retries that will all fail. |
249 | */ | |
86dbde9c MD |
250 | sdev->retry_hwerror = 1; |
251 | ||
f0183a33 FB |
252 | /* |
253 | * USB disks should allow restart. Some drives spin down | |
254 | * automatically, requiring a START-STOP UNIT command. | |
255 | */ | |
f09e495d MCC |
256 | sdev->allow_restart = 1; |
257 | ||
f0183a33 FB |
258 | /* |
259 | * Some USB cardreaders have trouble reading an sdcard's last | |
23c3e290 | 260 | * sector in a larger then 1 sector read, since the performance |
f0183a33 FB |
261 | * impact is negligible we set this flag for all USB disks |
262 | */ | |
23c3e290 | 263 | sdev->last_sector_bug = 1; |
25ff1c31 | 264 | |
f0183a33 FB |
265 | /* |
266 | * Enable last-sector hacks for single-target devices using | |
25ff1c31 | 267 | * the Bulk-only transport, unless we already know the |
f0183a33 FB |
268 | * capacity will be decremented or is correct. |
269 | */ | |
25ff1c31 AS |
270 | if (!(us->fflags & (US_FL_FIX_CAPACITY | US_FL_CAPACITY_OK | |
271 | US_FL_SCM_MULT_TARG)) && | |
8fa7fd74 | 272 | us->protocol == USB_PR_BULK) |
25ff1c31 | 273 | us->use_last_sector_hacks = 1; |
eaa05dfc NJ |
274 | |
275 | /* Check if write cache default on flag is set or not */ | |
276 | if (us->fflags & US_FL_WRITE_CACHE) | |
277 | sdev->wce_default_on = 1; | |
278 | ||
b14bf2d0 AS |
279 | /* A few buggy USB-ATA bridges don't understand FUA */ |
280 | if (us->fflags & US_FL_BROKEN_FUA) | |
281 | sdev->broken_fua = 1; | |
282 | ||
050bc4e8 ON |
283 | /* Some even totally fail to indicate a cache */ |
284 | if (us->fflags & US_FL_ALWAYS_SYNC) { | |
285 | /* don't read caching information */ | |
286 | sdev->skip_ms_page_8 = 1; | |
287 | sdev->skip_ms_page_3f = 1; | |
288 | /* assume sync is needed */ | |
289 | sdev->wce_default_on = 1; | |
290 | } | |
1da177e4 LT |
291 | } else { |
292 | ||
f0183a33 FB |
293 | /* |
294 | * Non-disk-type devices don't need to blacklist any pages | |
1da177e4 | 295 | * or to force 192-byte transfer lengths for MODE SENSE. |
f0183a33 FB |
296 | * But they do need to use MODE SENSE(10). |
297 | */ | |
1da177e4 | 298 | sdev->use_10_for_ms = 1; |
ae38c78a HG |
299 | |
300 | /* Some (fake) usb cdrom devices don't like READ_DISC_INFO */ | |
301 | if (us->fflags & US_FL_NO_READ_DISC_INFO) | |
302 | sdev->no_read_disc_info = 1; | |
1da177e4 LT |
303 | } |
304 | ||
f0183a33 FB |
305 | /* |
306 | * The CB and CBI transports have no way to pass LUN values | |
f3f49065 AS |
307 | * other than the bits in the second byte of a CDB. But those |
308 | * bits don't get set to the LUN value if the device reports | |
309 | * scsi_level == 0 (UNKNOWN). Hence such devices must necessarily | |
310 | * be single-LUN. | |
311 | */ | |
8fa7fd74 | 312 | if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_CBI) && |
f3f49065 AS |
313 | sdev->scsi_level == SCSI_UNKNOWN) |
314 | us->max_lun = 0; | |
315 | ||
f0183a33 FB |
316 | /* |
317 | * Some devices choke when they receive a PREVENT-ALLOW MEDIUM | |
318 | * REMOVAL command, so suppress those commands. | |
319 | */ | |
7e4d6c38 | 320 | if (us->fflags & US_FL_NOT_LOCKABLE) |
1da177e4 LT |
321 | sdev->lockable = 0; |
322 | ||
f0183a33 FB |
323 | /* |
324 | * this is to satisfy the compiler, tho I don't think the | |
325 | * return code is ever checked anywhere. | |
326 | */ | |
1da177e4 LT |
327 | return 0; |
328 | } | |
329 | ||
09b6b51b AS |
330 | static int target_alloc(struct scsi_target *starget) |
331 | { | |
af74d2da AS |
332 | struct us_data *us = host_to_us(dev_to_shost(starget->dev.parent)); |
333 | ||
09b6b51b AS |
334 | /* |
335 | * Some USB drives don't support REPORT LUNS, even though they | |
336 | * report a SCSI revision level above 2. Tell the SCSI layer | |
337 | * not to issue that command; it will perform a normal sequential | |
338 | * scan instead. | |
339 | */ | |
340 | starget->no_report_luns = 1; | |
af74d2da AS |
341 | |
342 | /* | |
343 | * The UFI spec treats the Peripheral Qualifier bits in an | |
344 | * INQUIRY result as reserved and requires devices to set them | |
345 | * to 0. However the SCSI spec requires these bits to be set | |
346 | * to 3 to indicate when a LUN is not present. | |
347 | * | |
348 | * Let the scanning code know if this target merely sets | |
349 | * Peripheral Device Type to 0x1f to indicate no LUN. | |
350 | */ | |
351 | if (us->subclass == USB_SC_UFI) | |
352 | starget->pdt_1f_for_no_lun = 1; | |
353 | ||
09b6b51b AS |
354 | return 0; |
355 | } | |
356 | ||
1da177e4 LT |
357 | /* queue a command */ |
358 | /* This is always called with scsi_lock(host) held */ | |
f281233d | 359 | static int queuecommand_lck(struct scsi_cmnd *srb, |
1da177e4 LT |
360 | void (*done)(struct scsi_cmnd *)) |
361 | { | |
362 | struct us_data *us = host_to_us(srb->device->host); | |
363 | ||
1da177e4 LT |
364 | /* check for state-transition errors */ |
365 | if (us->srb != NULL) { | |
366 | printk(KERN_ERR USB_STORAGE "Error in %s: us->srb = %p\n", | |
441b62c1 | 367 | __func__, us->srb); |
1da177e4 LT |
368 | return SCSI_MLQUEUE_HOST_BUSY; |
369 | } | |
370 | ||
371 | /* fail the command if we are disconnecting */ | |
7e4d6c38 | 372 | if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { |
191648d0 | 373 | usb_stor_dbg(us, "Fail command during disconnect\n"); |
1da177e4 LT |
374 | srb->result = DID_NO_CONNECT << 16; |
375 | done(srb); | |
376 | return 0; | |
f45681f9 TA |
377 | } |
378 | ||
379 | if ((us->fflags & US_FL_NO_ATA_1X) && | |
380 | (srb->cmnd[0] == ATA_12 || srb->cmnd[0] == ATA_16)) { | |
381 | memcpy(srb->sense_buffer, usb_stor_sense_invalidCDB, | |
382 | sizeof(usb_stor_sense_invalidCDB)); | |
383 | srb->result = SAM_STAT_CHECK_CONDITION; | |
384 | done(srb); | |
385 | return 0; | |
1da177e4 LT |
386 | } |
387 | ||
388 | /* enqueue the command and wake up the control thread */ | |
389 | srb->scsi_done = done; | |
390 | us->srb = srb; | |
7119e3c3 | 391 | complete(&us->cmnd_ready); |
1da177e4 LT |
392 | |
393 | return 0; | |
394 | } | |
395 | ||
f281233d JG |
396 | static DEF_SCSI_QCMD(queuecommand) |
397 | ||
1da177e4 LT |
398 | /*********************************************************************** |
399 | * Error handling functions | |
400 | ***********************************************************************/ | |
401 | ||
402 | /* Command timeout and abort */ | |
1da177e4 LT |
403 | static int command_abort(struct scsi_cmnd *srb) |
404 | { | |
405 | struct us_data *us = host_to_us(srb->device->host); | |
406 | ||
191648d0 | 407 | usb_stor_dbg(us, "%s called\n", __func__); |
1da177e4 | 408 | |
f0183a33 FB |
409 | /* |
410 | * us->srb together with the TIMED_OUT, RESETTING, and ABORTING | |
411 | * bits are protected by the host lock. | |
412 | */ | |
226173ed MD |
413 | scsi_lock(us_to_host(us)); |
414 | ||
1da177e4 LT |
415 | /* Is this command still active? */ |
416 | if (us->srb != srb) { | |
226173ed | 417 | scsi_unlock(us_to_host(us)); |
191648d0 | 418 | usb_stor_dbg(us, "-- nothing to abort\n"); |
1da177e4 LT |
419 | return FAILED; |
420 | } | |
421 | ||
f0183a33 FB |
422 | /* |
423 | * Set the TIMED_OUT bit. Also set the ABORTING bit, but only if | |
1da177e4 | 424 | * a device reset isn't already in progress (to avoid interfering |
226173ed MD |
425 | * with the reset). Note that we must retain the host lock while |
426 | * calling usb_stor_stop_transport(); otherwise it might interfere | |
f0183a33 FB |
427 | * with an auto-reset that begins as soon as we release the lock. |
428 | */ | |
7e4d6c38 AS |
429 | set_bit(US_FLIDX_TIMED_OUT, &us->dflags); |
430 | if (!test_bit(US_FLIDX_RESETTING, &us->dflags)) { | |
431 | set_bit(US_FLIDX_ABORTING, &us->dflags); | |
1da177e4 LT |
432 | usb_stor_stop_transport(us); |
433 | } | |
226173ed | 434 | scsi_unlock(us_to_host(us)); |
1da177e4 LT |
435 | |
436 | /* Wait for the aborted command to finish */ | |
437 | wait_for_completion(&us->notify); | |
1da177e4 LT |
438 | return SUCCESS; |
439 | } | |
440 | ||
f0183a33 FB |
441 | /* |
442 | * This invokes the transport reset mechanism to reset the state of the | |
443 | * device | |
444 | */ | |
1da177e4 LT |
445 | static int device_reset(struct scsi_cmnd *srb) |
446 | { | |
447 | struct us_data *us = host_to_us(srb->device->host); | |
448 | int result; | |
449 | ||
191648d0 | 450 | usb_stor_dbg(us, "%s called\n", __func__); |
1da177e4 | 451 | |
d526875d GKH |
452 | /* lock the device pointers and do the reset */ |
453 | mutex_lock(&(us->dev_mutex)); | |
454 | result = us->transport_reset(us); | |
455 | mutex_unlock(&us->dev_mutex); | |
1da177e4 | 456 | |
4d07ef76 | 457 | return result < 0 ? FAILED : SUCCESS; |
1da177e4 LT |
458 | } |
459 | ||
4d07ef76 | 460 | /* Simulate a SCSI bus reset by resetting the device's USB port. */ |
1da177e4 LT |
461 | static int bus_reset(struct scsi_cmnd *srb) |
462 | { | |
463 | struct us_data *us = host_to_us(srb->device->host); | |
4d07ef76 | 464 | int result; |
1da177e4 | 465 | |
191648d0 JP |
466 | usb_stor_dbg(us, "%s called\n", __func__); |
467 | ||
4d07ef76 | 468 | result = usb_stor_port_reset(us); |
1da177e4 LT |
469 | return result < 0 ? FAILED : SUCCESS; |
470 | } | |
471 | ||
f0183a33 FB |
472 | /* |
473 | * Report a driver-initiated device reset to the SCSI layer. | |
1da177e4 | 474 | * Calling this for a SCSI-initiated reset is unnecessary but harmless. |
f0183a33 FB |
475 | * The caller must own the SCSI host lock. |
476 | */ | |
1da177e4 LT |
477 | void usb_stor_report_device_reset(struct us_data *us) |
478 | { | |
479 | int i; | |
480 | struct Scsi_Host *host = us_to_host(us); | |
481 | ||
482 | scsi_report_device_reset(host, 0, 0); | |
7e4d6c38 | 483 | if (us->fflags & US_FL_SCM_MULT_TARG) { |
1da177e4 LT |
484 | for (i = 1; i < host->max_id; ++i) |
485 | scsi_report_device_reset(host, 0, i); | |
486 | } | |
487 | } | |
488 | ||
f0183a33 FB |
489 | /* |
490 | * Report a driver-initiated bus reset to the SCSI layer. | |
4d07ef76 | 491 | * Calling this for a SCSI-initiated reset is unnecessary but harmless. |
f0183a33 FB |
492 | * The caller must not own the SCSI host lock. |
493 | */ | |
4d07ef76 MD |
494 | void usb_stor_report_bus_reset(struct us_data *us) |
495 | { | |
f07600cf AS |
496 | struct Scsi_Host *host = us_to_host(us); |
497 | ||
498 | scsi_lock(host); | |
499 | scsi_report_bus_reset(host, 0); | |
500 | scsi_unlock(host); | |
4d07ef76 MD |
501 | } |
502 | ||
1da177e4 LT |
503 | /*********************************************************************** |
504 | * /proc/scsi/ functions | |
505 | ***********************************************************************/ | |
506 | ||
09dae7fc AV |
507 | static int write_info(struct Scsi_Host *host, char *buffer, int length) |
508 | { | |
509 | /* if someone is sending us data, just throw it away */ | |
510 | return length; | |
511 | } | |
512 | ||
09dae7fc | 513 | static int show_info (struct seq_file *m, struct Scsi_Host *host) |
1da177e4 LT |
514 | { |
515 | struct us_data *us = host_to_us(host); | |
1da177e4 LT |
516 | const char *string; |
517 | ||
1da177e4 | 518 | /* print the controller name */ |
7d203a9e | 519 | seq_printf(m, " Host scsi%d: usb-storage\n", host->host_no); |
1da177e4 LT |
520 | |
521 | /* print product, vendor, and serial number strings */ | |
522 | if (us->pusb_dev->manufacturer) | |
523 | string = us->pusb_dev->manufacturer; | |
524 | else if (us->unusual_dev->vendorName) | |
525 | string = us->unusual_dev->vendorName; | |
526 | else | |
527 | string = "Unknown"; | |
7d203a9e | 528 | seq_printf(m, " Vendor: %s\n", string); |
1da177e4 LT |
529 | if (us->pusb_dev->product) |
530 | string = us->pusb_dev->product; | |
531 | else if (us->unusual_dev->productName) | |
532 | string = us->unusual_dev->productName; | |
533 | else | |
534 | string = "Unknown"; | |
7d203a9e | 535 | seq_printf(m, " Product: %s\n", string); |
1da177e4 LT |
536 | if (us->pusb_dev->serial) |
537 | string = us->pusb_dev->serial; | |
538 | else | |
539 | string = "None"; | |
7d203a9e | 540 | seq_printf(m, "Serial Number: %s\n", string); |
1da177e4 LT |
541 | |
542 | /* show the protocol and transport */ | |
7d203a9e JP |
543 | seq_printf(m, " Protocol: %s\n", us->protocol_name); |
544 | seq_printf(m, " Transport: %s\n", us->transport_name); | |
1da177e4 LT |
545 | |
546 | /* show the device flags */ | |
7d203a9e | 547 | seq_printf(m, " Quirks:"); |
1da177e4 LT |
548 | |
549 | #define US_FLAG(name, value) \ | |
09dae7fc | 550 | if (us->fflags & value) seq_printf(m, " " #name); |
1da177e4 LT |
551 | US_DO_ALL_FLAGS |
552 | #undef US_FLAG | |
09dae7fc AV |
553 | seq_putc(m, '\n'); |
554 | return 0; | |
1da177e4 LT |
555 | } |
556 | ||
557 | /*********************************************************************** | |
558 | * Sysfs interface | |
559 | ***********************************************************************/ | |
560 | ||
561 | /* Output routine for the sysfs max_sectors file */ | |
f2e0ae93 | 562 | static ssize_t max_sectors_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
563 | { |
564 | struct scsi_device *sdev = to_scsi_device(dev); | |
565 | ||
49d6271b | 566 | return sprintf(buf, "%u\n", queue_max_hw_sectors(sdev->request_queue)); |
1da177e4 LT |
567 | } |
568 | ||
569 | /* Input routine for the sysfs max_sectors file */ | |
f2e0ae93 | 570 | static ssize_t max_sectors_store(struct device *dev, struct device_attribute *attr, const char *buf, |
1da177e4 LT |
571 | size_t count) |
572 | { | |
573 | struct scsi_device *sdev = to_scsi_device(dev); | |
574 | unsigned short ms; | |
575 | ||
49d6271b | 576 | if (sscanf(buf, "%hu", &ms) > 0) { |
086fa5ff | 577 | blk_queue_max_hw_sectors(sdev->request_queue, ms); |
49d6271b | 578 | return count; |
1da177e4 | 579 | } |
f2e0ae93 | 580 | return -EINVAL; |
1da177e4 | 581 | } |
f2e0ae93 | 582 | static DEVICE_ATTR_RW(max_sectors); |
1da177e4 LT |
583 | |
584 | static struct device_attribute *sysfs_device_attr_list[] = { | |
f2e0ae93 GKH |
585 | &dev_attr_max_sectors, |
586 | NULL, | |
587 | }; | |
1da177e4 LT |
588 | |
589 | /* | |
590 | * this defines our host template, with which we'll allocate hosts | |
591 | */ | |
592 | ||
aa519be3 | 593 | static const struct scsi_host_template usb_stor_host_template = { |
1da177e4 LT |
594 | /* basic userland interface stuff */ |
595 | .name = "usb-storage", | |
596 | .proc_name = "usb-storage", | |
09dae7fc AV |
597 | .show_info = show_info, |
598 | .write_info = write_info, | |
1da177e4 LT |
599 | .info = host_info, |
600 | ||
601 | /* command interface -- queued only */ | |
602 | .queuecommand = queuecommand, | |
603 | ||
604 | /* error and abort handlers */ | |
605 | .eh_abort_handler = command_abort, | |
606 | .eh_device_reset_handler = device_reset, | |
607 | .eh_bus_reset_handler = bus_reset, | |
608 | ||
609 | /* queue commands only, only one command per LUN */ | |
610 | .can_queue = 1, | |
1da177e4 LT |
611 | |
612 | /* unknown initiator id */ | |
613 | .this_id = -1, | |
614 | ||
615 | .slave_alloc = slave_alloc, | |
616 | .slave_configure = slave_configure, | |
09b6b51b | 617 | .target_alloc = target_alloc, |
1da177e4 LT |
618 | |
619 | /* lots of sg segments can be handled */ | |
65e8617f | 620 | .sg_tablesize = SG_MAX_SEGMENTS, |
1da177e4 | 621 | |
779b457f FB |
622 | |
623 | /* | |
624 | * Limit the total size of a transfer to 120 KB. | |
625 | * | |
626 | * Some devices are known to choke with anything larger. It seems like | |
627 | * the problem stems from the fact that original IDE controllers had | |
628 | * only an 8-bit register to hold the number of sectors in one transfer | |
629 | * and even those couldn't handle a full 256 sectors. | |
630 | * | |
631 | * Because we want to make sure we interoperate with as many devices as | |
632 | * possible, we will maintain a 240 sector transfer size limit for USB | |
633 | * Mass Storage devices. | |
634 | * | |
635 | * Tests show that other operating have similar limits with Microsoft | |
636 | * Windows 7 limiting transfers to 128 sectors for both USB2 and USB3 | |
637 | * and Apple Mac OS X 10.11 limiting transfers to 256 sectors for USB2 | |
638 | * and 2048 for USB3 devices. | |
639 | */ | |
1da177e4 LT |
640 | .max_sectors = 240, |
641 | ||
1da177e4 LT |
642 | /* emulated HBA */ |
643 | .emulated = 1, | |
644 | ||
645 | /* we do our own delay after a device or bus reset */ | |
646 | .skip_settle_delay = 1, | |
647 | ||
648 | /* sysfs device attributes */ | |
649 | .sdev_attrs = sysfs_device_attr_list, | |
650 | ||
651 | /* module management */ | |
652 | .module = THIS_MODULE | |
653 | }; | |
654 | ||
aa519be3 AM |
655 | void usb_stor_host_template_init(struct scsi_host_template *sht, |
656 | const char *name, struct module *owner) | |
657 | { | |
658 | *sht = usb_stor_host_template; | |
659 | sht->name = name; | |
660 | sht->proc_name = name; | |
661 | sht->module = owner; | |
662 | } | |
663 | EXPORT_SYMBOL_GPL(usb_stor_host_template_init); | |
664 | ||
1da177e4 LT |
665 | /* To Report "Illegal Request: Invalid Field in CDB */ |
666 | unsigned char usb_stor_sense_invalidCDB[18] = { | |
667 | [0] = 0x70, /* current error */ | |
668 | [2] = ILLEGAL_REQUEST, /* Illegal Request = 0x05 */ | |
669 | [7] = 0x0a, /* additional length */ | |
670 | [12] = 0x24 /* Invalid Field in CDB */ | |
671 | }; | |
e6e244b6 | 672 | EXPORT_SYMBOL_GPL(usb_stor_sense_invalidCDB); |