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1da177e4 | 1 | /* Driver for USB Mass Storage compliant devices |
1da177e4 LT |
2 | * |
3 | * Current development and maintenance by: | |
4 | * (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net) | |
5 | * | |
6 | * Developed with the assistance of: | |
7 | * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org) | |
8 | * (c) 2000 Stephen J. Gowdy (SGowdy@lbl.gov) | |
9 | * (c) 2002 Alan Stern <stern@rowland.org> | |
10 | * | |
11 | * Initial work by: | |
12 | * (c) 1999 Michael Gee (michael@linuxspecific.com) | |
13 | * | |
14 | * This driver is based on the 'USB Mass Storage Class' document. This | |
15 | * describes in detail the protocol used to communicate with such | |
16 | * devices. Clearly, the designers had SCSI and ATAPI commands in | |
17 | * mind when they created this document. The commands are all very | |
18 | * similar to commands in the SCSI-II and ATAPI specifications. | |
19 | * | |
20 | * It is important to note that in a number of cases this class | |
21 | * exhibits class-specific exemptions from the USB specification. | |
22 | * Notably the usage of NAK, STALL and ACK differs from the norm, in | |
23 | * that they are used to communicate wait, failed and OK on commands. | |
24 | * | |
25 | * Also, for certain devices, the interrupt endpoint is used to convey | |
26 | * status of a command. | |
27 | * | |
28 | * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more | |
29 | * information about this driver. | |
30 | * | |
31 | * This program is free software; you can redistribute it and/or modify it | |
32 | * under the terms of the GNU General Public License as published by the | |
33 | * Free Software Foundation; either version 2, or (at your option) any | |
34 | * later version. | |
35 | * | |
36 | * This program is distributed in the hope that it will be useful, but | |
37 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
38 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
39 | * General Public License for more details. | |
40 | * | |
41 | * You should have received a copy of the GNU General Public License along | |
42 | * with this program; if not, write to the Free Software Foundation, Inc., | |
43 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
44 | */ | |
45 | ||
1da177e4 | 46 | #include <linux/sched.h> |
5a0e3ad6 | 47 | #include <linux/gfp.h> |
1da177e4 | 48 | #include <linux/errno.h> |
f940fcd8 | 49 | #include <linux/export.h> |
1da177e4 | 50 | |
5d398779 ON |
51 | #include <linux/usb/quirks.h> |
52 | ||
1da177e4 | 53 | #include <scsi/scsi.h> |
dff6de73 | 54 | #include <scsi/scsi_eh.h> |
1da177e4 LT |
55 | #include <scsi/scsi_device.h> |
56 | ||
57 | #include "usb.h" | |
58 | #include "transport.h" | |
59 | #include "protocol.h" | |
60 | #include "scsiglue.h" | |
61 | #include "debug.h" | |
62 | ||
25ff1c31 AS |
63 | #include <linux/blkdev.h> |
64 | #include "../../scsi/sd.h" | |
65 | ||
1da177e4 LT |
66 | |
67 | /*********************************************************************** | |
68 | * Data transfer routines | |
69 | ***********************************************************************/ | |
70 | ||
71 | /* | |
72 | * This is subtle, so pay attention: | |
73 | * --------------------------------- | |
74 | * We're very concerned about races with a command abort. Hanging this code | |
75 | * is a sure fire way to hang the kernel. (Note that this discussion applies | |
76 | * only to transactions resulting from a scsi queued-command, since only | |
77 | * these transactions are subject to a scsi abort. Other transactions, such | |
78 | * as those occurring during device-specific initialization, must be handled | |
79 | * by a separate code path.) | |
80 | * | |
81 | * The abort function (usb_storage_command_abort() in scsiglue.c) first | |
7e4d6c38 | 82 | * sets the machine state and the ABORTING bit in us->dflags to prevent |
1da177e4 | 83 | * new URBs from being submitted. It then calls usb_stor_stop_transport() |
7e4d6c38 | 84 | * below, which atomically tests-and-clears the URB_ACTIVE bit in us->dflags |
1da177e4 LT |
85 | * to see if the current_urb needs to be stopped. Likewise, the SG_ACTIVE |
86 | * bit is tested to see if the current_sg scatter-gather request needs to be | |
87 | * stopped. The timeout callback routine does much the same thing. | |
88 | * | |
7e4d6c38 | 89 | * When a disconnect occurs, the DISCONNECTING bit in us->dflags is set to |
1da177e4 LT |
90 | * prevent new URBs from being submitted, and usb_stor_stop_transport() is |
91 | * called to stop any ongoing requests. | |
92 | * | |
93 | * The submit function first verifies that the submitting is allowed | |
94 | * (neither ABORTING nor DISCONNECTING bits are set) and that the submit | |
95 | * completes without errors, and only then sets the URB_ACTIVE bit. This | |
96 | * prevents the stop_transport() function from trying to cancel the URB | |
97 | * while the submit call is underway. Next, the submit function must test | |
98 | * the flags to see if an abort or disconnect occurred during the submission | |
99 | * or before the URB_ACTIVE bit was set. If so, it's essential to cancel | |
100 | * the URB if it hasn't been cancelled already (i.e., if the URB_ACTIVE bit | |
101 | * is still set). Either way, the function must then wait for the URB to | |
b375a049 AS |
102 | * finish. Note that the URB can still be in progress even after a call to |
103 | * usb_unlink_urb() returns. | |
1da177e4 LT |
104 | * |
105 | * The idea is that (1) once the ABORTING or DISCONNECTING bit is set, | |
106 | * either the stop_transport() function or the submitting function | |
107 | * is guaranteed to call usb_unlink_urb() for an active URB, | |
108 | * and (2) test_and_clear_bit() prevents usb_unlink_urb() from being | |
109 | * called more than once or from being called during usb_submit_urb(). | |
110 | */ | |
111 | ||
112 | /* This is the completion handler which will wake us up when an URB | |
113 | * completes. | |
114 | */ | |
7d12e780 | 115 | static void usb_stor_blocking_completion(struct urb *urb) |
1da177e4 | 116 | { |
cdc97792 | 117 | struct completion *urb_done_ptr = urb->context; |
1da177e4 LT |
118 | |
119 | complete(urb_done_ptr); | |
120 | } | |
1da177e4 LT |
121 | |
122 | /* This is the common part of the URB message submission code | |
123 | * | |
124 | * All URBs from the usb-storage driver involved in handling a queued scsi | |
125 | * command _must_ pass through this function (or something like it) for the | |
126 | * abort mechanisms to work properly. | |
127 | */ | |
128 | static int usb_stor_msg_common(struct us_data *us, int timeout) | |
129 | { | |
130 | struct completion urb_done; | |
3428cc43 | 131 | long timeleft; |
1da177e4 LT |
132 | int status; |
133 | ||
543f7810 AS |
134 | /* don't submit URBs during abort processing */ |
135 | if (test_bit(US_FLIDX_ABORTING, &us->dflags)) | |
1da177e4 LT |
136 | return -EIO; |
137 | ||
138 | /* set up data structures for the wakeup system */ | |
139 | init_completion(&urb_done); | |
140 | ||
141 | /* fill the common fields in the URB */ | |
142 | us->current_urb->context = &urb_done; | |
c222fb2e | 143 | us->current_urb->transfer_flags = 0; |
1da177e4 LT |
144 | |
145 | /* we assume that if transfer_buffer isn't us->iobuf then it | |
146 | * hasn't been mapped for DMA. Yes, this is clunky, but it's | |
147 | * easier than always having the caller tell us whether the | |
148 | * transfer buffer has already been mapped. */ | |
1da177e4 LT |
149 | if (us->current_urb->transfer_buffer == us->iobuf) |
150 | us->current_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
151 | us->current_urb->transfer_dma = us->iobuf_dma; | |
1da177e4 LT |
152 | |
153 | /* submit the URB */ | |
154 | status = usb_submit_urb(us->current_urb, GFP_NOIO); | |
155 | if (status) { | |
156 | /* something went wrong */ | |
157 | return status; | |
158 | } | |
159 | ||
160 | /* since the URB has been submitted successfully, it's now okay | |
161 | * to cancel it */ | |
7e4d6c38 | 162 | set_bit(US_FLIDX_URB_ACTIVE, &us->dflags); |
1da177e4 | 163 | |
543f7810 AS |
164 | /* did an abort occur during the submission? */ |
165 | if (test_bit(US_FLIDX_ABORTING, &us->dflags)) { | |
1da177e4 LT |
166 | |
167 | /* cancel the URB, if it hasn't been cancelled already */ | |
7e4d6c38 | 168 | if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags)) { |
1da177e4 LT |
169 | US_DEBUGP("-- cancelling URB\n"); |
170 | usb_unlink_urb(us->current_urb); | |
171 | } | |
172 | } | |
173 | ||
1da177e4 | 174 | /* wait for the completion of the URB */ |
3428cc43 FBH |
175 | timeleft = wait_for_completion_interruptible_timeout( |
176 | &urb_done, timeout ? : MAX_SCHEDULE_TIMEOUT); | |
1da177e4 | 177 | |
7e4d6c38 | 178 | clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags); |
3428cc43 FBH |
179 | |
180 | if (timeleft <= 0) { | |
181 | US_DEBUGP("%s -- cancelling URB\n", | |
182 | timeleft == 0 ? "Timeout" : "Signal"); | |
d6b7d3b6 | 183 | usb_kill_urb(us->current_urb); |
3428cc43 | 184 | } |
1da177e4 LT |
185 | |
186 | /* return the URB status */ | |
187 | return us->current_urb->status; | |
188 | } | |
189 | ||
190 | /* | |
191 | * Transfer one control message, with timeouts, and allowing early | |
192 | * termination. Return codes are usual -Exxx, *not* USB_STOR_XFER_xxx. | |
193 | */ | |
194 | int usb_stor_control_msg(struct us_data *us, unsigned int pipe, | |
195 | u8 request, u8 requesttype, u16 value, u16 index, | |
196 | void *data, u16 size, int timeout) | |
197 | { | |
198 | int status; | |
199 | ||
200 | US_DEBUGP("%s: rq=%02x rqtype=%02x value=%04x index=%02x len=%u\n", | |
441b62c1 | 201 | __func__, request, requesttype, |
1da177e4 LT |
202 | value, index, size); |
203 | ||
204 | /* fill in the devrequest structure */ | |
205 | us->cr->bRequestType = requesttype; | |
206 | us->cr->bRequest = request; | |
207 | us->cr->wValue = cpu_to_le16(value); | |
208 | us->cr->wIndex = cpu_to_le16(index); | |
209 | us->cr->wLength = cpu_to_le16(size); | |
210 | ||
211 | /* fill and submit the URB */ | |
212 | usb_fill_control_urb(us->current_urb, us->pusb_dev, pipe, | |
213 | (unsigned char*) us->cr, data, size, | |
214 | usb_stor_blocking_completion, NULL); | |
215 | status = usb_stor_msg_common(us, timeout); | |
216 | ||
217 | /* return the actual length of the data transferred if no error */ | |
218 | if (status == 0) | |
219 | status = us->current_urb->actual_length; | |
220 | return status; | |
221 | } | |
e6e244b6 | 222 | EXPORT_SYMBOL_GPL(usb_stor_control_msg); |
1da177e4 LT |
223 | |
224 | /* This is a version of usb_clear_halt() that allows early termination and | |
225 | * doesn't read the status from the device -- this is because some devices | |
226 | * crash their internal firmware when the status is requested after a halt. | |
227 | * | |
228 | * A definitive list of these 'bad' devices is too difficult to maintain or | |
229 | * make complete enough to be useful. This problem was first observed on the | |
230 | * Hagiwara FlashGate DUAL unit. However, bus traces reveal that neither | |
231 | * MacOS nor Windows checks the status after clearing a halt. | |
232 | * | |
233 | * Since many vendors in this space limit their testing to interoperability | |
234 | * with these two OSes, specification violations like this one are common. | |
235 | */ | |
236 | int usb_stor_clear_halt(struct us_data *us, unsigned int pipe) | |
237 | { | |
238 | int result; | |
239 | int endp = usb_pipeendpoint(pipe); | |
240 | ||
241 | if (usb_pipein (pipe)) | |
242 | endp |= USB_DIR_IN; | |
243 | ||
244 | result = usb_stor_control_msg(us, us->send_ctrl_pipe, | |
245 | USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT, | |
246 | USB_ENDPOINT_HALT, endp, | |
247 | NULL, 0, 3*HZ); | |
248 | ||
5203ad44 | 249 | if (result >= 0) |
3444b26a | 250 | usb_reset_endpoint(us->pusb_dev, endp); |
1da177e4 | 251 | |
441b62c1 | 252 | US_DEBUGP("%s: result = %d\n", __func__, result); |
1da177e4 LT |
253 | return result; |
254 | } | |
e6e244b6 | 255 | EXPORT_SYMBOL_GPL(usb_stor_clear_halt); |
1da177e4 LT |
256 | |
257 | ||
258 | /* | |
259 | * Interpret the results of a URB transfer | |
260 | * | |
261 | * This function prints appropriate debugging messages, clears halts on | |
262 | * non-control endpoints, and translates the status to the corresponding | |
263 | * USB_STOR_XFER_xxx return code. | |
264 | */ | |
265 | static int interpret_urb_result(struct us_data *us, unsigned int pipe, | |
266 | unsigned int length, int result, unsigned int partial) | |
267 | { | |
268 | US_DEBUGP("Status code %d; transferred %u/%u\n", | |
269 | result, partial, length); | |
270 | switch (result) { | |
271 | ||
272 | /* no error code; did we send all the data? */ | |
273 | case 0: | |
274 | if (partial != length) { | |
275 | US_DEBUGP("-- short transfer\n"); | |
276 | return USB_STOR_XFER_SHORT; | |
277 | } | |
278 | ||
279 | US_DEBUGP("-- transfer complete\n"); | |
280 | return USB_STOR_XFER_GOOD; | |
281 | ||
282 | /* stalled */ | |
283 | case -EPIPE: | |
284 | /* for control endpoints, (used by CB[I]) a stall indicates | |
285 | * a failed command */ | |
286 | if (usb_pipecontrol(pipe)) { | |
287 | US_DEBUGP("-- stall on control pipe\n"); | |
288 | return USB_STOR_XFER_STALLED; | |
289 | } | |
290 | ||
291 | /* for other sorts of endpoint, clear the stall */ | |
292 | US_DEBUGP("clearing endpoint halt for pipe 0x%x\n", pipe); | |
293 | if (usb_stor_clear_halt(us, pipe) < 0) | |
294 | return USB_STOR_XFER_ERROR; | |
295 | return USB_STOR_XFER_STALLED; | |
296 | ||
1da177e4 LT |
297 | /* babble - the device tried to send more than we wanted to read */ |
298 | case -EOVERFLOW: | |
299 | US_DEBUGP("-- babble\n"); | |
300 | return USB_STOR_XFER_LONG; | |
301 | ||
302 | /* the transfer was cancelled by abort, disconnect, or timeout */ | |
303 | case -ECONNRESET: | |
304 | US_DEBUGP("-- transfer cancelled\n"); | |
305 | return USB_STOR_XFER_ERROR; | |
306 | ||
307 | /* short scatter-gather read transfer */ | |
308 | case -EREMOTEIO: | |
309 | US_DEBUGP("-- short read transfer\n"); | |
310 | return USB_STOR_XFER_SHORT; | |
311 | ||
312 | /* abort or disconnect in progress */ | |
313 | case -EIO: | |
314 | US_DEBUGP("-- abort or disconnect in progress\n"); | |
315 | return USB_STOR_XFER_ERROR; | |
316 | ||
317 | /* the catch-all error case */ | |
318 | default: | |
319 | US_DEBUGP("-- unknown error\n"); | |
320 | return USB_STOR_XFER_ERROR; | |
321 | } | |
322 | } | |
323 | ||
324 | /* | |
325 | * Transfer one control message, without timeouts, but allowing early | |
326 | * termination. Return codes are USB_STOR_XFER_xxx. | |
327 | */ | |
328 | int usb_stor_ctrl_transfer(struct us_data *us, unsigned int pipe, | |
329 | u8 request, u8 requesttype, u16 value, u16 index, | |
330 | void *data, u16 size) | |
331 | { | |
332 | int result; | |
333 | ||
334 | US_DEBUGP("%s: rq=%02x rqtype=%02x value=%04x index=%02x len=%u\n", | |
441b62c1 | 335 | __func__, request, requesttype, |
1da177e4 LT |
336 | value, index, size); |
337 | ||
338 | /* fill in the devrequest structure */ | |
339 | us->cr->bRequestType = requesttype; | |
340 | us->cr->bRequest = request; | |
341 | us->cr->wValue = cpu_to_le16(value); | |
342 | us->cr->wIndex = cpu_to_le16(index); | |
343 | us->cr->wLength = cpu_to_le16(size); | |
344 | ||
345 | /* fill and submit the URB */ | |
346 | usb_fill_control_urb(us->current_urb, us->pusb_dev, pipe, | |
347 | (unsigned char*) us->cr, data, size, | |
348 | usb_stor_blocking_completion, NULL); | |
349 | result = usb_stor_msg_common(us, 0); | |
350 | ||
351 | return interpret_urb_result(us, pipe, size, result, | |
352 | us->current_urb->actual_length); | |
353 | } | |
e6e244b6 | 354 | EXPORT_SYMBOL_GPL(usb_stor_ctrl_transfer); |
1da177e4 LT |
355 | |
356 | /* | |
357 | * Receive one interrupt buffer, without timeouts, but allowing early | |
358 | * termination. Return codes are USB_STOR_XFER_xxx. | |
359 | * | |
360 | * This routine always uses us->recv_intr_pipe as the pipe and | |
361 | * us->ep_bInterval as the interrupt interval. | |
362 | */ | |
363 | static int usb_stor_intr_transfer(struct us_data *us, void *buf, | |
364 | unsigned int length) | |
365 | { | |
366 | int result; | |
367 | unsigned int pipe = us->recv_intr_pipe; | |
368 | unsigned int maxp; | |
369 | ||
441b62c1 | 370 | US_DEBUGP("%s: xfer %u bytes\n", __func__, length); |
1da177e4 LT |
371 | |
372 | /* calculate the max packet size */ | |
373 | maxp = usb_maxpacket(us->pusb_dev, pipe, usb_pipeout(pipe)); | |
374 | if (maxp > length) | |
375 | maxp = length; | |
376 | ||
377 | /* fill and submit the URB */ | |
378 | usb_fill_int_urb(us->current_urb, us->pusb_dev, pipe, buf, | |
379 | maxp, usb_stor_blocking_completion, NULL, | |
380 | us->ep_bInterval); | |
381 | result = usb_stor_msg_common(us, 0); | |
382 | ||
383 | return interpret_urb_result(us, pipe, length, result, | |
384 | us->current_urb->actual_length); | |
385 | } | |
386 | ||
387 | /* | |
388 | * Transfer one buffer via bulk pipe, without timeouts, but allowing early | |
389 | * termination. Return codes are USB_STOR_XFER_xxx. If the bulk pipe | |
390 | * stalls during the transfer, the halt is automatically cleared. | |
391 | */ | |
392 | int usb_stor_bulk_transfer_buf(struct us_data *us, unsigned int pipe, | |
393 | void *buf, unsigned int length, unsigned int *act_len) | |
394 | { | |
395 | int result; | |
396 | ||
441b62c1 | 397 | US_DEBUGP("%s: xfer %u bytes\n", __func__, length); |
1da177e4 LT |
398 | |
399 | /* fill and submit the URB */ | |
400 | usb_fill_bulk_urb(us->current_urb, us->pusb_dev, pipe, buf, length, | |
401 | usb_stor_blocking_completion, NULL); | |
402 | result = usb_stor_msg_common(us, 0); | |
403 | ||
404 | /* store the actual length of the data transferred */ | |
405 | if (act_len) | |
406 | *act_len = us->current_urb->actual_length; | |
407 | return interpret_urb_result(us, pipe, length, result, | |
408 | us->current_urb->actual_length); | |
409 | } | |
e6e244b6 | 410 | EXPORT_SYMBOL_GPL(usb_stor_bulk_transfer_buf); |
1da177e4 LT |
411 | |
412 | /* | |
413 | * Transfer a scatter-gather list via bulk transfer | |
414 | * | |
415 | * This function does basically the same thing as usb_stor_bulk_transfer_buf() | |
416 | * above, but it uses the usbcore scatter-gather library. | |
417 | */ | |
418 | static int usb_stor_bulk_transfer_sglist(struct us_data *us, unsigned int pipe, | |
419 | struct scatterlist *sg, int num_sg, unsigned int length, | |
420 | unsigned int *act_len) | |
421 | { | |
422 | int result; | |
423 | ||
543f7810 AS |
424 | /* don't submit s-g requests during abort processing */ |
425 | if (test_bit(US_FLIDX_ABORTING, &us->dflags)) | |
1da177e4 LT |
426 | return USB_STOR_XFER_ERROR; |
427 | ||
428 | /* initialize the scatter-gather request block */ | |
441b62c1 | 429 | US_DEBUGP("%s: xfer %u bytes, %d entries\n", __func__, |
1da177e4 LT |
430 | length, num_sg); |
431 | result = usb_sg_init(&us->current_sg, us->pusb_dev, pipe, 0, | |
55acbda0 | 432 | sg, num_sg, length, GFP_NOIO); |
1da177e4 LT |
433 | if (result) { |
434 | US_DEBUGP("usb_sg_init returned %d\n", result); | |
435 | return USB_STOR_XFER_ERROR; | |
436 | } | |
437 | ||
438 | /* since the block has been initialized successfully, it's now | |
439 | * okay to cancel it */ | |
7e4d6c38 | 440 | set_bit(US_FLIDX_SG_ACTIVE, &us->dflags); |
1da177e4 | 441 | |
543f7810 AS |
442 | /* did an abort occur during the submission? */ |
443 | if (test_bit(US_FLIDX_ABORTING, &us->dflags)) { | |
1da177e4 LT |
444 | |
445 | /* cancel the request, if it hasn't been cancelled already */ | |
7e4d6c38 | 446 | if (test_and_clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags)) { |
1da177e4 LT |
447 | US_DEBUGP("-- cancelling sg request\n"); |
448 | usb_sg_cancel(&us->current_sg); | |
449 | } | |
450 | } | |
451 | ||
452 | /* wait for the completion of the transfer */ | |
453 | usb_sg_wait(&us->current_sg); | |
7e4d6c38 | 454 | clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags); |
1da177e4 LT |
455 | |
456 | result = us->current_sg.status; | |
457 | if (act_len) | |
458 | *act_len = us->current_sg.bytes; | |
459 | return interpret_urb_result(us, pipe, length, result, | |
460 | us->current_sg.bytes); | |
461 | } | |
462 | ||
6d416e61 BH |
463 | /* |
464 | * Common used function. Transfer a complete command | |
465 | * via usb_stor_bulk_transfer_sglist() above. Set cmnd resid | |
466 | */ | |
467 | int usb_stor_bulk_srb(struct us_data* us, unsigned int pipe, | |
468 | struct scsi_cmnd* srb) | |
469 | { | |
470 | unsigned int partial; | |
471 | int result = usb_stor_bulk_transfer_sglist(us, pipe, scsi_sglist(srb), | |
472 | scsi_sg_count(srb), scsi_bufflen(srb), | |
473 | &partial); | |
474 | ||
475 | scsi_set_resid(srb, scsi_bufflen(srb) - partial); | |
476 | return result; | |
477 | } | |
e6e244b6 | 478 | EXPORT_SYMBOL_GPL(usb_stor_bulk_srb); |
6d416e61 | 479 | |
1da177e4 LT |
480 | /* |
481 | * Transfer an entire SCSI command's worth of data payload over the bulk | |
482 | * pipe. | |
483 | * | |
484 | * Note that this uses usb_stor_bulk_transfer_buf() and | |
485 | * usb_stor_bulk_transfer_sglist() to achieve its goals -- | |
486 | * this function simply determines whether we're going to use | |
487 | * scatter-gather or not, and acts appropriately. | |
488 | */ | |
489 | int usb_stor_bulk_transfer_sg(struct us_data* us, unsigned int pipe, | |
490 | void *buf, unsigned int length_left, int use_sg, int *residual) | |
491 | { | |
492 | int result; | |
493 | unsigned int partial; | |
494 | ||
495 | /* are we scatter-gathering? */ | |
496 | if (use_sg) { | |
497 | /* use the usb core scatter-gather primitives */ | |
498 | result = usb_stor_bulk_transfer_sglist(us, pipe, | |
499 | (struct scatterlist *) buf, use_sg, | |
500 | length_left, &partial); | |
501 | length_left -= partial; | |
502 | } else { | |
503 | /* no scatter-gather, just make the request */ | |
504 | result = usb_stor_bulk_transfer_buf(us, pipe, buf, | |
505 | length_left, &partial); | |
506 | length_left -= partial; | |
507 | } | |
508 | ||
509 | /* store the residual and return the error code */ | |
510 | if (residual) | |
511 | *residual = length_left; | |
512 | return result; | |
513 | } | |
e6e244b6 | 514 | EXPORT_SYMBOL_GPL(usb_stor_bulk_transfer_sg); |
1da177e4 LT |
515 | |
516 | /*********************************************************************** | |
517 | * Transport routines | |
518 | ***********************************************************************/ | |
519 | ||
25ff1c31 AS |
520 | /* There are so many devices that report the capacity incorrectly, |
521 | * this routine was written to counteract some of the resulting | |
522 | * problems. | |
523 | */ | |
524 | static void last_sector_hacks(struct us_data *us, struct scsi_cmnd *srb) | |
525 | { | |
526 | struct gendisk *disk; | |
527 | struct scsi_disk *sdkp; | |
528 | u32 sector; | |
529 | ||
530 | /* To Report "Medium Error: Record Not Found */ | |
531 | static unsigned char record_not_found[18] = { | |
532 | [0] = 0x70, /* current error */ | |
533 | [2] = MEDIUM_ERROR, /* = 0x03 */ | |
534 | [7] = 0x0a, /* additional length */ | |
535 | [12] = 0x14 /* Record Not Found */ | |
536 | }; | |
537 | ||
538 | /* If last-sector problems can't occur, whether because the | |
539 | * capacity was already decremented or because the device is | |
540 | * known to report the correct capacity, then we don't need | |
541 | * to do anything. | |
542 | */ | |
543 | if (!us->use_last_sector_hacks) | |
544 | return; | |
545 | ||
546 | /* Was this command a READ(10) or a WRITE(10)? */ | |
547 | if (srb->cmnd[0] != READ_10 && srb->cmnd[0] != WRITE_10) | |
548 | goto done; | |
549 | ||
550 | /* Did this command access the last sector? */ | |
551 | sector = (srb->cmnd[2] << 24) | (srb->cmnd[3] << 16) | | |
552 | (srb->cmnd[4] << 8) | (srb->cmnd[5]); | |
553 | disk = srb->request->rq_disk; | |
554 | if (!disk) | |
555 | goto done; | |
556 | sdkp = scsi_disk(disk); | |
557 | if (!sdkp) | |
558 | goto done; | |
559 | if (sector + 1 != sdkp->capacity) | |
560 | goto done; | |
561 | ||
562 | if (srb->result == SAM_STAT_GOOD && scsi_get_resid(srb) == 0) { | |
563 | ||
0d020aae AS |
564 | /* The command succeeded. We know this device doesn't |
565 | * have the last-sector bug, so stop checking it. | |
25ff1c31 | 566 | */ |
0d020aae | 567 | us->use_last_sector_hacks = 0; |
25ff1c31 AS |
568 | |
569 | } else { | |
570 | /* The command failed. Allow up to 3 retries in case this | |
571 | * is some normal sort of failure. After that, assume the | |
572 | * capacity is wrong and we're trying to access the sector | |
573 | * beyond the end. Replace the result code and sense data | |
574 | * with values that will cause the SCSI core to fail the | |
575 | * command immediately, instead of going into an infinite | |
576 | * (or even just a very long) retry loop. | |
577 | */ | |
578 | if (++us->last_sector_retries < 3) | |
579 | return; | |
580 | srb->result = SAM_STAT_CHECK_CONDITION; | |
581 | memcpy(srb->sense_buffer, record_not_found, | |
582 | sizeof(record_not_found)); | |
25ff1c31 AS |
583 | } |
584 | ||
585 | done: | |
586 | /* Don't reset the retry counter for TEST UNIT READY commands, | |
587 | * because they get issued after device resets which might be | |
588 | * caused by a failed last-sector access. | |
589 | */ | |
590 | if (srb->cmnd[0] != TEST_UNIT_READY) | |
591 | us->last_sector_retries = 0; | |
592 | } | |
593 | ||
1da177e4 LT |
594 | /* Invoke the transport and basic error-handling/recovery methods |
595 | * | |
596 | * This is used by the protocol layers to actually send the message to | |
597 | * the device and receive the response. | |
598 | */ | |
599 | void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us) | |
600 | { | |
601 | int need_auto_sense; | |
602 | int result; | |
603 | ||
604 | /* send the command to the transport layer */ | |
6d416e61 | 605 | scsi_set_resid(srb, 0); |
1da177e4 LT |
606 | result = us->transport(srb, us); |
607 | ||
608 | /* if the command gets aborted by the higher layers, we need to | |
609 | * short-circuit all other processing | |
610 | */ | |
7e4d6c38 | 611 | if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) { |
1da177e4 | 612 | US_DEBUGP("-- command was aborted\n"); |
4d07ef76 MD |
613 | srb->result = DID_ABORT << 16; |
614 | goto Handle_Errors; | |
1da177e4 LT |
615 | } |
616 | ||
617 | /* if there is a transport error, reset and don't auto-sense */ | |
618 | if (result == USB_STOR_TRANSPORT_ERROR) { | |
619 | US_DEBUGP("-- transport indicates error, resetting\n"); | |
1da177e4 | 620 | srb->result = DID_ERROR << 16; |
4d07ef76 | 621 | goto Handle_Errors; |
1da177e4 LT |
622 | } |
623 | ||
624 | /* if the transport provided its own sense data, don't auto-sense */ | |
625 | if (result == USB_STOR_TRANSPORT_NO_SENSE) { | |
626 | srb->result = SAM_STAT_CHECK_CONDITION; | |
25ff1c31 | 627 | last_sector_hacks(us, srb); |
1da177e4 LT |
628 | return; |
629 | } | |
630 | ||
631 | srb->result = SAM_STAT_GOOD; | |
632 | ||
633 | /* Determine if we need to auto-sense | |
634 | * | |
635 | * I normally don't use a flag like this, but it's almost impossible | |
636 | * to understand what's going on here if I don't. | |
637 | */ | |
638 | need_auto_sense = 0; | |
639 | ||
640 | /* | |
641 | * If we're running the CB transport, which is incapable | |
642 | * of determining status on its own, we will auto-sense | |
643 | * unless the operation involved a data-in transfer. Devices | |
644 | * can signal most data-in errors by stalling the bulk-in pipe. | |
645 | */ | |
8fa7fd74 | 646 | if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_DPCM_USB) && |
1da177e4 LT |
647 | srb->sc_data_direction != DMA_FROM_DEVICE) { |
648 | US_DEBUGP("-- CB transport device requiring auto-sense\n"); | |
649 | need_auto_sense = 1; | |
650 | } | |
651 | ||
652 | /* | |
653 | * If we have a failure, we're going to do a REQUEST_SENSE | |
654 | * automatically. Note that we differentiate between a command | |
655 | * "failure" and an "error" in the transport mechanism. | |
656 | */ | |
657 | if (result == USB_STOR_TRANSPORT_FAILED) { | |
658 | US_DEBUGP("-- transport indicates command failure\n"); | |
659 | need_auto_sense = 1; | |
660 | } | |
661 | ||
1537e0ad BE |
662 | /* |
663 | * Determine if this device is SAT by seeing if the | |
664 | * command executed successfully. Otherwise we'll have | |
665 | * to wait for at least one CHECK_CONDITION to determine | |
666 | * SANE_SENSE support | |
667 | */ | |
a0bb1081 | 668 | if (unlikely((srb->cmnd[0] == ATA_16 || srb->cmnd[0] == ATA_12) && |
1537e0ad BE |
669 | result == USB_STOR_TRANSPORT_GOOD && |
670 | !(us->fflags & US_FL_SANE_SENSE) && | |
a0bb1081 AS |
671 | !(us->fflags & US_FL_BAD_SENSE) && |
672 | !(srb->cmnd[2] & 0x20))) { | |
1537e0ad BE |
673 | US_DEBUGP("-- SAT supported, increasing auto-sense\n"); |
674 | us->fflags |= US_FL_SANE_SENSE; | |
675 | } | |
676 | ||
1da177e4 LT |
677 | /* |
678 | * A short transfer on a command where we don't expect it | |
679 | * is unusual, but it doesn't mean we need to auto-sense. | |
680 | */ | |
6d416e61 | 681 | if ((scsi_get_resid(srb) > 0) && |
1da177e4 LT |
682 | !((srb->cmnd[0] == REQUEST_SENSE) || |
683 | (srb->cmnd[0] == INQUIRY) || | |
684 | (srb->cmnd[0] == MODE_SENSE) || | |
685 | (srb->cmnd[0] == LOG_SENSE) || | |
686 | (srb->cmnd[0] == MODE_SENSE_10))) { | |
687 | US_DEBUGP("-- unexpectedly short transfer\n"); | |
688 | } | |
689 | ||
690 | /* Now, if we need to do the auto-sense, let's do it */ | |
691 | if (need_auto_sense) { | |
692 | int temp_result; | |
dff6de73 | 693 | struct scsi_eh_save ses; |
1537e0ad | 694 | int sense_size = US_SENSE_SIZE; |
e16da02f LT |
695 | struct scsi_sense_hdr sshdr; |
696 | const u8 *scdd; | |
697 | u8 fm_ili; | |
1537e0ad BE |
698 | |
699 | /* device supports and needs bigger sense buffer */ | |
700 | if (us->fflags & US_FL_SANE_SENSE) | |
701 | sense_size = ~0; | |
b8430e1b | 702 | Retry_Sense: |
1da177e4 LT |
703 | US_DEBUGP("Issuing auto-REQUEST_SENSE\n"); |
704 | ||
1537e0ad | 705 | scsi_eh_prep_cmnd(srb, &ses, NULL, 0, sense_size); |
1da177e4 LT |
706 | |
707 | /* FIXME: we must do the protocol translation here */ | |
8fa7fd74 MN |
708 | if (us->subclass == USB_SC_RBC || us->subclass == USB_SC_SCSI || |
709 | us->subclass == USB_SC_CYP_ATACB) | |
1da177e4 LT |
710 | srb->cmd_len = 6; |
711 | else | |
712 | srb->cmd_len = 12; | |
713 | ||
1da177e4 | 714 | /* issue the auto-sense command */ |
6d416e61 | 715 | scsi_set_resid(srb, 0); |
1da177e4 LT |
716 | temp_result = us->transport(us->srb, us); |
717 | ||
718 | /* let's clean up right away */ | |
dff6de73 | 719 | scsi_eh_restore_cmnd(srb, &ses); |
1da177e4 | 720 | |
7e4d6c38 | 721 | if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) { |
1da177e4 | 722 | US_DEBUGP("-- auto-sense aborted\n"); |
4d07ef76 | 723 | srb->result = DID_ABORT << 16; |
a0bb1081 AS |
724 | |
725 | /* If SANE_SENSE caused this problem, disable it */ | |
726 | if (sense_size != US_SENSE_SIZE) { | |
727 | us->fflags &= ~US_FL_SANE_SENSE; | |
728 | us->fflags |= US_FL_BAD_SENSE; | |
729 | } | |
4d07ef76 | 730 | goto Handle_Errors; |
1da177e4 | 731 | } |
b8430e1b BH |
732 | |
733 | /* Some devices claim to support larger sense but fail when | |
734 | * trying to request it. When a transport failure happens | |
735 | * using US_FS_SANE_SENSE, we always retry with a standard | |
736 | * (small) sense request. This fixes some USB GSM modems | |
737 | */ | |
738 | if (temp_result == USB_STOR_TRANSPORT_FAILED && | |
a0bb1081 | 739 | sense_size != US_SENSE_SIZE) { |
b8430e1b BH |
740 | US_DEBUGP("-- auto-sense failure, retry small sense\n"); |
741 | sense_size = US_SENSE_SIZE; | |
a0bb1081 AS |
742 | us->fflags &= ~US_FL_SANE_SENSE; |
743 | us->fflags |= US_FL_BAD_SENSE; | |
b8430e1b BH |
744 | goto Retry_Sense; |
745 | } | |
746 | ||
747 | /* Other failures */ | |
1da177e4 LT |
748 | if (temp_result != USB_STOR_TRANSPORT_GOOD) { |
749 | US_DEBUGP("-- auto-sense failure\n"); | |
750 | ||
751 | /* we skip the reset if this happens to be a | |
752 | * multi-target device, since failure of an | |
753 | * auto-sense is perfectly valid | |
754 | */ | |
1da177e4 | 755 | srb->result = DID_ERROR << 16; |
7e4d6c38 | 756 | if (!(us->fflags & US_FL_SCM_MULT_TARG)) |
4d07ef76 | 757 | goto Handle_Errors; |
1da177e4 LT |
758 | return; |
759 | } | |
760 | ||
1537e0ad BE |
761 | /* If the sense data returned is larger than 18-bytes then we |
762 | * assume this device supports requesting more in the future. | |
763 | * The response code must be 70h through 73h inclusive. | |
764 | */ | |
765 | if (srb->sense_buffer[7] > (US_SENSE_SIZE - 8) && | |
766 | !(us->fflags & US_FL_SANE_SENSE) && | |
a0bb1081 | 767 | !(us->fflags & US_FL_BAD_SENSE) && |
1537e0ad BE |
768 | (srb->sense_buffer[0] & 0x7C) == 0x70) { |
769 | US_DEBUGP("-- SANE_SENSE support enabled\n"); | |
770 | us->fflags |= US_FL_SANE_SENSE; | |
771 | ||
772 | /* Indicate to the user that we truncated their sense | |
773 | * because we didn't know it supported larger sense. | |
774 | */ | |
775 | US_DEBUGP("-- Sense data truncated to %i from %i\n", | |
776 | US_SENSE_SIZE, | |
777 | srb->sense_buffer[7] + 8); | |
778 | srb->sense_buffer[7] = (US_SENSE_SIZE - 8); | |
779 | } | |
780 | ||
e16da02f LT |
781 | scsi_normalize_sense(srb->sense_buffer, SCSI_SENSE_BUFFERSIZE, |
782 | &sshdr); | |
783 | ||
1da177e4 LT |
784 | US_DEBUGP("-- Result from auto-sense is %d\n", temp_result); |
785 | US_DEBUGP("-- code: 0x%x, key: 0x%x, ASC: 0x%x, ASCQ: 0x%x\n", | |
e16da02f LT |
786 | sshdr.response_code, sshdr.sense_key, |
787 | sshdr.asc, sshdr.ascq); | |
1da177e4 | 788 | #ifdef CONFIG_USB_STORAGE_DEBUG |
e16da02f | 789 | usb_stor_show_sense(sshdr.sense_key, sshdr.asc, sshdr.ascq); |
1da177e4 LT |
790 | #endif |
791 | ||
792 | /* set the result so the higher layers expect this data */ | |
793 | srb->result = SAM_STAT_CHECK_CONDITION; | |
794 | ||
e16da02f LT |
795 | scdd = scsi_sense_desc_find(srb->sense_buffer, |
796 | SCSI_SENSE_BUFFERSIZE, 4); | |
797 | fm_ili = (scdd ? scdd[3] : srb->sense_buffer[2]) & 0xA0; | |
798 | ||
f1a0743b AS |
799 | /* We often get empty sense data. This could indicate that |
800 | * everything worked or that there was an unspecified | |
801 | * problem. We have to decide which. | |
802 | */ | |
e16da02f LT |
803 | if (sshdr.sense_key == 0 && sshdr.asc == 0 && sshdr.ascq == 0 && |
804 | fm_ili == 0) { | |
f1a0743b AS |
805 | /* If things are really okay, then let's show that. |
806 | * Zero out the sense buffer so the higher layers | |
807 | * won't realize we did an unsolicited auto-sense. | |
808 | */ | |
809 | if (result == USB_STOR_TRANSPORT_GOOD) { | |
810 | srb->result = SAM_STAT_GOOD; | |
811 | srb->sense_buffer[0] = 0x0; | |
812 | ||
813 | /* If there was a problem, report an unspecified | |
814 | * hardware error to prevent the higher layers from | |
815 | * entering an infinite retry loop. | |
816 | */ | |
817 | } else { | |
818 | srb->result = DID_ERROR << 16; | |
e16da02f LT |
819 | if ((sshdr.response_code & 0x72) == 0x72) |
820 | srb->sense_buffer[1] = HARDWARE_ERROR; | |
821 | else | |
822 | srb->sense_buffer[2] = HARDWARE_ERROR; | |
f1a0743b | 823 | } |
1da177e4 LT |
824 | } |
825 | } | |
826 | ||
21c13a4f AS |
827 | /* |
828 | * Some devices don't work or return incorrect data the first | |
829 | * time they get a READ(10) command, or for the first READ(10) | |
830 | * after a media change. If the INITIAL_READ10 flag is set, | |
831 | * keep track of whether READ(10) commands succeed. If the | |
832 | * previous one succeeded and this one failed, set the REDO_READ10 | |
833 | * flag to force a retry. | |
834 | */ | |
835 | if (unlikely((us->fflags & US_FL_INITIAL_READ10) && | |
836 | srb->cmnd[0] == READ_10)) { | |
837 | if (srb->result == SAM_STAT_GOOD) { | |
838 | set_bit(US_FLIDX_READ10_WORKED, &us->dflags); | |
839 | } else if (test_bit(US_FLIDX_READ10_WORKED, &us->dflags)) { | |
840 | clear_bit(US_FLIDX_READ10_WORKED, &us->dflags); | |
841 | set_bit(US_FLIDX_REDO_READ10, &us->dflags); | |
842 | } | |
843 | ||
844 | /* | |
845 | * Next, if the REDO_READ10 flag is set, return a result | |
846 | * code that will cause the SCSI core to retry the READ(10) | |
847 | * command immediately. | |
848 | */ | |
849 | if (test_bit(US_FLIDX_REDO_READ10, &us->dflags)) { | |
850 | clear_bit(US_FLIDX_REDO_READ10, &us->dflags); | |
851 | srb->result = DID_IMM_RETRY << 16; | |
852 | srb->sense_buffer[0] = 0; | |
853 | } | |
854 | } | |
855 | ||
1da177e4 | 856 | /* Did we transfer less than the minimum amount required? */ |
8bfa2472 | 857 | if ((srb->result == SAM_STAT_GOOD || srb->sense_buffer[2] == 0) && |
6d416e61 | 858 | scsi_bufflen(srb) - scsi_get_resid(srb) < srb->underflow) |
1c9fbafc | 859 | srb->result = DID_ERROR << 16; |
1da177e4 | 860 | |
25ff1c31 | 861 | last_sector_hacks(us, srb); |
1da177e4 LT |
862 | return; |
863 | ||
4d07ef76 MD |
864 | /* Error and abort processing: try to resynchronize with the device |
865 | * by issuing a port reset. If that fails, try a class-specific | |
866 | * device reset. */ | |
867 | Handle_Errors: | |
868 | ||
47104b0d AS |
869 | /* Set the RESETTING bit, and clear the ABORTING bit so that |
870 | * the reset may proceed. */ | |
4d07ef76 | 871 | scsi_lock(us_to_host(us)); |
7e4d6c38 AS |
872 | set_bit(US_FLIDX_RESETTING, &us->dflags); |
873 | clear_bit(US_FLIDX_ABORTING, &us->dflags); | |
4d07ef76 MD |
874 | scsi_unlock(us_to_host(us)); |
875 | ||
47104b0d AS |
876 | /* We must release the device lock because the pre_reset routine |
877 | * will want to acquire it. */ | |
878 | mutex_unlock(&us->dev_mutex); | |
4d07ef76 | 879 | result = usb_stor_port_reset(us); |
47104b0d AS |
880 | mutex_lock(&us->dev_mutex); |
881 | ||
4d07ef76 MD |
882 | if (result < 0) { |
883 | scsi_lock(us_to_host(us)); | |
884 | usb_stor_report_device_reset(us); | |
885 | scsi_unlock(us_to_host(us)); | |
1da177e4 | 886 | us->transport_reset(us); |
4d07ef76 | 887 | } |
7e4d6c38 | 888 | clear_bit(US_FLIDX_RESETTING, &us->dflags); |
25ff1c31 | 889 | last_sector_hacks(us, srb); |
1da177e4 LT |
890 | } |
891 | ||
892 | /* Stop the current URB transfer */ | |
893 | void usb_stor_stop_transport(struct us_data *us) | |
894 | { | |
441b62c1 | 895 | US_DEBUGP("%s called\n", __func__); |
1da177e4 LT |
896 | |
897 | /* If the state machine is blocked waiting for an URB, | |
898 | * let's wake it up. The test_and_clear_bit() call | |
899 | * guarantees that if a URB has just been submitted, | |
900 | * it won't be cancelled more than once. */ | |
7e4d6c38 | 901 | if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags)) { |
1da177e4 LT |
902 | US_DEBUGP("-- cancelling URB\n"); |
903 | usb_unlink_urb(us->current_urb); | |
904 | } | |
905 | ||
906 | /* If we are waiting for a scatter-gather operation, cancel it. */ | |
7e4d6c38 | 907 | if (test_and_clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags)) { |
1da177e4 LT |
908 | US_DEBUGP("-- cancelling sg request\n"); |
909 | usb_sg_cancel(&us->current_sg); | |
910 | } | |
911 | } | |
912 | ||
913 | /* | |
64648a9d | 914 | * Control/Bulk and Control/Bulk/Interrupt transport |
1da177e4 LT |
915 | */ |
916 | ||
64648a9d | 917 | int usb_stor_CB_transport(struct scsi_cmnd *srb, struct us_data *us) |
1da177e4 | 918 | { |
6d416e61 | 919 | unsigned int transfer_length = scsi_bufflen(srb); |
1da177e4 LT |
920 | unsigned int pipe = 0; |
921 | int result; | |
922 | ||
923 | /* COMMAND STAGE */ | |
924 | /* let's send the command via the control pipe */ | |
925 | result = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe, | |
926 | US_CBI_ADSC, | |
927 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0, | |
928 | us->ifnum, srb->cmnd, srb->cmd_len); | |
929 | ||
930 | /* check the return code for the command */ | |
931 | US_DEBUGP("Call to usb_stor_ctrl_transfer() returned %d\n", result); | |
932 | ||
933 | /* if we stalled the command, it means command failed */ | |
934 | if (result == USB_STOR_XFER_STALLED) { | |
935 | return USB_STOR_TRANSPORT_FAILED; | |
936 | } | |
937 | ||
938 | /* Uh oh... serious problem here */ | |
939 | if (result != USB_STOR_XFER_GOOD) { | |
940 | return USB_STOR_TRANSPORT_ERROR; | |
941 | } | |
942 | ||
943 | /* DATA STAGE */ | |
944 | /* transfer the data payload for this command, if one exists*/ | |
945 | if (transfer_length) { | |
946 | pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? | |
947 | us->recv_bulk_pipe : us->send_bulk_pipe; | |
6d416e61 | 948 | result = usb_stor_bulk_srb(us, pipe, srb); |
1da177e4 LT |
949 | US_DEBUGP("CBI data stage result is 0x%x\n", result); |
950 | ||
951 | /* if we stalled the data transfer it means command failed */ | |
952 | if (result == USB_STOR_XFER_STALLED) | |
953 | return USB_STOR_TRANSPORT_FAILED; | |
954 | if (result > USB_STOR_XFER_STALLED) | |
955 | return USB_STOR_TRANSPORT_ERROR; | |
956 | } | |
957 | ||
958 | /* STATUS STAGE */ | |
64648a9d AS |
959 | |
960 | /* NOTE: CB does not have a status stage. Silly, I know. So | |
961 | * we have to catch this at a higher level. | |
962 | */ | |
8fa7fd74 | 963 | if (us->protocol != USB_PR_CBI) |
64648a9d AS |
964 | return USB_STOR_TRANSPORT_GOOD; |
965 | ||
1da177e4 LT |
966 | result = usb_stor_intr_transfer(us, us->iobuf, 2); |
967 | US_DEBUGP("Got interrupt data (0x%x, 0x%x)\n", | |
968 | us->iobuf[0], us->iobuf[1]); | |
969 | if (result != USB_STOR_XFER_GOOD) | |
970 | return USB_STOR_TRANSPORT_ERROR; | |
971 | ||
972 | /* UFI gives us ASC and ASCQ, like a request sense | |
973 | * | |
974 | * REQUEST_SENSE and INQUIRY don't affect the sense data on UFI | |
975 | * devices, so we ignore the information for those commands. Note | |
976 | * that this means we could be ignoring a real error on these | |
977 | * commands, but that can't be helped. | |
978 | */ | |
8fa7fd74 | 979 | if (us->subclass == USB_SC_UFI) { |
1da177e4 LT |
980 | if (srb->cmnd[0] == REQUEST_SENSE || |
981 | srb->cmnd[0] == INQUIRY) | |
982 | return USB_STOR_TRANSPORT_GOOD; | |
983 | if (us->iobuf[0]) | |
984 | goto Failed; | |
985 | return USB_STOR_TRANSPORT_GOOD; | |
986 | } | |
987 | ||
988 | /* If not UFI, we interpret the data as a result code | |
989 | * The first byte should always be a 0x0. | |
990 | * | |
991 | * Some bogus devices don't follow that rule. They stuff the ASC | |
992 | * into the first byte -- so if it's non-zero, call it a failure. | |
993 | */ | |
994 | if (us->iobuf[0]) { | |
995 | US_DEBUGP("CBI IRQ data showed reserved bType 0x%x\n", | |
996 | us->iobuf[0]); | |
997 | goto Failed; | |
998 | ||
999 | } | |
1000 | ||
1001 | /* The second byte & 0x0F should be 0x0 for good, otherwise error */ | |
1002 | switch (us->iobuf[1] & 0x0F) { | |
1003 | case 0x00: | |
1004 | return USB_STOR_TRANSPORT_GOOD; | |
1005 | case 0x01: | |
1006 | goto Failed; | |
1007 | } | |
1008 | return USB_STOR_TRANSPORT_ERROR; | |
1009 | ||
1010 | /* the CBI spec requires that the bulk pipe must be cleared | |
1011 | * following any data-in/out command failure (section 2.4.3.1.3) | |
1012 | */ | |
1013 | Failed: | |
1014 | if (pipe) | |
1015 | usb_stor_clear_halt(us, pipe); | |
1016 | return USB_STOR_TRANSPORT_FAILED; | |
1017 | } | |
e6e244b6 | 1018 | EXPORT_SYMBOL_GPL(usb_stor_CB_transport); |
1da177e4 | 1019 | |
1da177e4 LT |
1020 | /* |
1021 | * Bulk only transport | |
1022 | */ | |
1023 | ||
1024 | /* Determine what the maximum LUN supported is */ | |
1025 | int usb_stor_Bulk_max_lun(struct us_data *us) | |
1026 | { | |
1027 | int result; | |
1028 | ||
1029 | /* issue the command */ | |
b876aef7 | 1030 | us->iobuf[0] = 0; |
1da177e4 LT |
1031 | result = usb_stor_control_msg(us, us->recv_ctrl_pipe, |
1032 | US_BULK_GET_MAX_LUN, | |
1033 | USB_DIR_IN | USB_TYPE_CLASS | | |
1034 | USB_RECIP_INTERFACE, | |
7a777919 | 1035 | 0, us->ifnum, us->iobuf, 1, 10*HZ); |
1da177e4 LT |
1036 | |
1037 | US_DEBUGP("GetMaxLUN command result is %d, data is %d\n", | |
1038 | result, us->iobuf[0]); | |
1039 | ||
1040 | /* if we have a successful request, return the result */ | |
1041 | if (result > 0) | |
1042 | return us->iobuf[0]; | |
1043 | ||
1da177e4 LT |
1044 | /* |
1045 | * Some devices don't like GetMaxLUN. They may STALL the control | |
1046 | * pipe, they may return a zero-length result, they may do nothing at | |
1047 | * all and timeout, or they may fail in even more bizarrely creative | |
1048 | * ways. In these cases the best approach is to use the default | |
1049 | * value: only one LUN. | |
1050 | */ | |
1051 | return 0; | |
1052 | } | |
1053 | ||
1054 | int usb_stor_Bulk_transport(struct scsi_cmnd *srb, struct us_data *us) | |
1055 | { | |
1056 | struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap *) us->iobuf; | |
1057 | struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap *) us->iobuf; | |
6d416e61 | 1058 | unsigned int transfer_length = scsi_bufflen(srb); |
1da177e4 LT |
1059 | unsigned int residue; |
1060 | int result; | |
1061 | int fake_sense = 0; | |
1062 | unsigned int cswlen; | |
1063 | unsigned int cbwlen = US_BULK_CB_WRAP_LEN; | |
1064 | ||
1065 | /* Take care of BULK32 devices; set extra byte to 0 */ | |
7e4d6c38 | 1066 | if (unlikely(us->fflags & US_FL_BULK32)) { |
1da177e4 LT |
1067 | cbwlen = 32; |
1068 | us->iobuf[31] = 0; | |
1069 | } | |
1070 | ||
1071 | /* set up the command wrapper */ | |
1072 | bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN); | |
1073 | bcb->DataTransferLength = cpu_to_le32(transfer_length); | |
b8db6d64 SAS |
1074 | bcb->Flags = srb->sc_data_direction == DMA_FROM_DEVICE ? |
1075 | US_BULK_FLAG_IN : 0; | |
0f64e078 | 1076 | bcb->Tag = ++us->tag; |
1da177e4 | 1077 | bcb->Lun = srb->device->lun; |
7e4d6c38 | 1078 | if (us->fflags & US_FL_SCM_MULT_TARG) |
1da177e4 LT |
1079 | bcb->Lun |= srb->device->id << 4; |
1080 | bcb->Length = srb->cmd_len; | |
1081 | ||
1082 | /* copy the command payload */ | |
1083 | memset(bcb->CDB, 0, sizeof(bcb->CDB)); | |
1084 | memcpy(bcb->CDB, srb->cmnd, bcb->Length); | |
1085 | ||
1086 | /* send it to out endpoint */ | |
1087 | US_DEBUGP("Bulk Command S 0x%x T 0x%x L %d F %d Trg %d LUN %d CL %d\n", | |
1088 | le32_to_cpu(bcb->Signature), bcb->Tag, | |
1089 | le32_to_cpu(bcb->DataTransferLength), bcb->Flags, | |
1090 | (bcb->Lun >> 4), (bcb->Lun & 0x0F), | |
1091 | bcb->Length); | |
1092 | result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, | |
1093 | bcb, cbwlen, NULL); | |
1094 | US_DEBUGP("Bulk command transfer result=%d\n", result); | |
1095 | if (result != USB_STOR_XFER_GOOD) | |
1096 | return USB_STOR_TRANSPORT_ERROR; | |
1097 | ||
1098 | /* DATA STAGE */ | |
1099 | /* send/receive data payload, if there is any */ | |
1100 | ||
1101 | /* Some USB-IDE converter chips need a 100us delay between the | |
1102 | * command phase and the data phase. Some devices need a little | |
1103 | * more than that, probably because of clock rate inaccuracies. */ | |
7e4d6c38 | 1104 | if (unlikely(us->fflags & US_FL_GO_SLOW)) |
e4334fa4 | 1105 | udelay(125); |
1da177e4 LT |
1106 | |
1107 | if (transfer_length) { | |
1108 | unsigned int pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? | |
1109 | us->recv_bulk_pipe : us->send_bulk_pipe; | |
6d416e61 | 1110 | result = usb_stor_bulk_srb(us, pipe, srb); |
1da177e4 LT |
1111 | US_DEBUGP("Bulk data transfer result 0x%x\n", result); |
1112 | if (result == USB_STOR_XFER_ERROR) | |
1113 | return USB_STOR_TRANSPORT_ERROR; | |
1114 | ||
1115 | /* If the device tried to send back more data than the | |
1116 | * amount requested, the spec requires us to transfer | |
1117 | * the CSW anyway. Since there's no point retrying the | |
1118 | * the command, we'll return fake sense data indicating | |
1119 | * Illegal Request, Invalid Field in CDB. | |
1120 | */ | |
1121 | if (result == USB_STOR_XFER_LONG) | |
1122 | fake_sense = 1; | |
1123 | } | |
1124 | ||
1125 | /* See flow chart on pg 15 of the Bulk Only Transport spec for | |
1126 | * an explanation of how this code works. | |
1127 | */ | |
1128 | ||
1129 | /* get CSW for device status */ | |
1130 | US_DEBUGP("Attempting to get CSW...\n"); | |
1131 | result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, | |
1132 | bcs, US_BULK_CS_WRAP_LEN, &cswlen); | |
1133 | ||
1134 | /* Some broken devices add unnecessary zero-length packets to the | |
1135 | * end of their data transfers. Such packets show up as 0-length | |
1136 | * CSWs. If we encounter such a thing, try to read the CSW again. | |
1137 | */ | |
1138 | if (result == USB_STOR_XFER_SHORT && cswlen == 0) { | |
1139 | US_DEBUGP("Received 0-length CSW; retrying...\n"); | |
1140 | result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, | |
1141 | bcs, US_BULK_CS_WRAP_LEN, &cswlen); | |
1142 | } | |
1143 | ||
1144 | /* did the attempt to read the CSW fail? */ | |
1145 | if (result == USB_STOR_XFER_STALLED) { | |
1146 | ||
1147 | /* get the status again */ | |
1148 | US_DEBUGP("Attempting to get CSW (2nd try)...\n"); | |
1149 | result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, | |
1150 | bcs, US_BULK_CS_WRAP_LEN, NULL); | |
1151 | } | |
1152 | ||
1153 | /* if we still have a failure at this point, we're in trouble */ | |
1154 | US_DEBUGP("Bulk status result = %d\n", result); | |
1155 | if (result != USB_STOR_XFER_GOOD) | |
1156 | return USB_STOR_TRANSPORT_ERROR; | |
1157 | ||
1158 | /* check bulk status */ | |
1159 | residue = le32_to_cpu(bcs->Residue); | |
1160 | US_DEBUGP("Bulk Status S 0x%x T 0x%x R %u Stat 0x%x\n", | |
1161 | le32_to_cpu(bcs->Signature), bcs->Tag, | |
1162 | residue, bcs->Status); | |
7e4d6c38 | 1163 | if (!(bcs->Tag == us->tag || (us->fflags & US_FL_BULK_IGNORE_TAG)) || |
cc36bdd4 | 1164 | bcs->Status > US_BULK_STAT_PHASE) { |
1da177e4 LT |
1165 | US_DEBUGP("Bulk logical error\n"); |
1166 | return USB_STOR_TRANSPORT_ERROR; | |
1167 | } | |
1168 | ||
1169 | /* Some broken devices report odd signatures, so we do not check them | |
1170 | * for validity against the spec. We store the first one we see, | |
1171 | * and check subsequent transfers for validity against this signature. | |
1172 | */ | |
1173 | if (!us->bcs_signature) { | |
1174 | us->bcs_signature = bcs->Signature; | |
1175 | if (us->bcs_signature != cpu_to_le32(US_BULK_CS_SIGN)) | |
1176 | US_DEBUGP("Learnt BCS signature 0x%08X\n", | |
1177 | le32_to_cpu(us->bcs_signature)); | |
1178 | } else if (bcs->Signature != us->bcs_signature) { | |
1179 | US_DEBUGP("Signature mismatch: got %08X, expecting %08X\n", | |
1180 | le32_to_cpu(bcs->Signature), | |
1181 | le32_to_cpu(us->bcs_signature)); | |
1182 | return USB_STOR_TRANSPORT_ERROR; | |
1183 | } | |
1184 | ||
1185 | /* try to compute the actual residue, based on how much data | |
1186 | * was really transferred and what the device tells us */ | |
59f4ff2e AS |
1187 | if (residue && !(us->fflags & US_FL_IGNORE_RESIDUE)) { |
1188 | ||
1189 | /* Heuristically detect devices that generate bogus residues | |
1190 | * by seeing what happens with INQUIRY and READ CAPACITY | |
1191 | * commands. | |
1192 | */ | |
1193 | if (bcs->Status == US_BULK_STAT_OK && | |
1194 | scsi_get_resid(srb) == 0 && | |
1195 | ((srb->cmnd[0] == INQUIRY && | |
1196 | transfer_length == 36) || | |
1197 | (srb->cmnd[0] == READ_CAPACITY && | |
1198 | transfer_length == 8))) { | |
1199 | us->fflags |= US_FL_IGNORE_RESIDUE; | |
1200 | ||
1201 | } else { | |
1da177e4 | 1202 | residue = min(residue, transfer_length); |
6d416e61 BH |
1203 | scsi_set_resid(srb, max(scsi_get_resid(srb), |
1204 | (int) residue)); | |
1da177e4 LT |
1205 | } |
1206 | } | |
1207 | ||
1208 | /* based on the status code, we report good or bad */ | |
1209 | switch (bcs->Status) { | |
1210 | case US_BULK_STAT_OK: | |
1211 | /* device babbled -- return fake sense data */ | |
1212 | if (fake_sense) { | |
1213 | memcpy(srb->sense_buffer, | |
1214 | usb_stor_sense_invalidCDB, | |
1215 | sizeof(usb_stor_sense_invalidCDB)); | |
1216 | return USB_STOR_TRANSPORT_NO_SENSE; | |
1217 | } | |
1218 | ||
1219 | /* command good -- note that data could be short */ | |
1220 | return USB_STOR_TRANSPORT_GOOD; | |
1221 | ||
1222 | case US_BULK_STAT_FAIL: | |
1223 | /* command failed */ | |
1224 | return USB_STOR_TRANSPORT_FAILED; | |
1225 | ||
1226 | case US_BULK_STAT_PHASE: | |
1227 | /* phase error -- note that a transport reset will be | |
1228 | * invoked by the invoke_transport() function | |
1229 | */ | |
1230 | return USB_STOR_TRANSPORT_ERROR; | |
1231 | } | |
1232 | ||
1233 | /* we should never get here, but if we do, we're in trouble */ | |
1234 | return USB_STOR_TRANSPORT_ERROR; | |
1235 | } | |
e6e244b6 | 1236 | EXPORT_SYMBOL_GPL(usb_stor_Bulk_transport); |
1da177e4 LT |
1237 | |
1238 | /*********************************************************************** | |
1239 | * Reset routines | |
1240 | ***********************************************************************/ | |
1241 | ||
1242 | /* This is the common part of the device reset code. | |
1243 | * | |
1244 | * It's handy that every transport mechanism uses the control endpoint for | |
1245 | * resets. | |
1246 | * | |
5203ad44 | 1247 | * Basically, we send a reset with a 5-second timeout, so we don't get |
1da177e4 LT |
1248 | * jammed attempting to do the reset. |
1249 | */ | |
1250 | static int usb_stor_reset_common(struct us_data *us, | |
1251 | u8 request, u8 requesttype, | |
1252 | u16 value, u16 index, void *data, u16 size) | |
1253 | { | |
1254 | int result; | |
1255 | int result2; | |
1da177e4 | 1256 | |
7e4d6c38 | 1257 | if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { |
4d07ef76 MD |
1258 | US_DEBUGP("No reset during disconnect\n"); |
1259 | return -EIO; | |
1260 | } | |
1da177e4 | 1261 | |
1da177e4 LT |
1262 | result = usb_stor_control_msg(us, us->send_ctrl_pipe, |
1263 | request, requesttype, value, index, data, size, | |
5203ad44 | 1264 | 5*HZ); |
1da177e4 LT |
1265 | if (result < 0) { |
1266 | US_DEBUGP("Soft reset failed: %d\n", result); | |
4d07ef76 | 1267 | return result; |
1da177e4 LT |
1268 | } |
1269 | ||
7e4d6c38 AS |
1270 | /* Give the device some time to recover from the reset, |
1271 | * but don't delay disconnect processing. */ | |
1272 | wait_event_interruptible_timeout(us->delay_wait, | |
1273 | test_bit(US_FLIDX_DISCONNECTING, &us->dflags), | |
1274 | HZ*6); | |
1275 | if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { | |
1da177e4 | 1276 | US_DEBUGP("Reset interrupted by disconnect\n"); |
4d07ef76 | 1277 | return -EIO; |
1da177e4 LT |
1278 | } |
1279 | ||
1280 | US_DEBUGP("Soft reset: clearing bulk-in endpoint halt\n"); | |
1281 | result = usb_stor_clear_halt(us, us->recv_bulk_pipe); | |
1282 | ||
1283 | US_DEBUGP("Soft reset: clearing bulk-out endpoint halt\n"); | |
1284 | result2 = usb_stor_clear_halt(us, us->send_bulk_pipe); | |
1285 | ||
5203ad44 MD |
1286 | /* return a result code based on the result of the clear-halts */ |
1287 | if (result >= 0) | |
1288 | result = result2; | |
4d07ef76 | 1289 | if (result < 0) |
1da177e4 | 1290 | US_DEBUGP("Soft reset failed\n"); |
4d07ef76 MD |
1291 | else |
1292 | US_DEBUGP("Soft reset done\n"); | |
1293 | return result; | |
1da177e4 LT |
1294 | } |
1295 | ||
1296 | /* This issues a CB[I] Reset to the device in question | |
1297 | */ | |
1298 | #define CB_RESET_CMD_SIZE 12 | |
1299 | ||
1300 | int usb_stor_CB_reset(struct us_data *us) | |
1301 | { | |
441b62c1 | 1302 | US_DEBUGP("%s called\n", __func__); |
1da177e4 LT |
1303 | |
1304 | memset(us->iobuf, 0xFF, CB_RESET_CMD_SIZE); | |
1305 | us->iobuf[0] = SEND_DIAGNOSTIC; | |
1306 | us->iobuf[1] = 4; | |
1307 | return usb_stor_reset_common(us, US_CBI_ADSC, | |
1308 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
1309 | 0, us->ifnum, us->iobuf, CB_RESET_CMD_SIZE); | |
1310 | } | |
e6e244b6 | 1311 | EXPORT_SYMBOL_GPL(usb_stor_CB_reset); |
1da177e4 LT |
1312 | |
1313 | /* This issues a Bulk-only Reset to the device in question, including | |
1314 | * clearing the subsequent endpoint halts that may occur. | |
1315 | */ | |
1316 | int usb_stor_Bulk_reset(struct us_data *us) | |
1317 | { | |
441b62c1 | 1318 | US_DEBUGP("%s called\n", __func__); |
1da177e4 LT |
1319 | |
1320 | return usb_stor_reset_common(us, US_BULK_RESET_REQUEST, | |
1321 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
1322 | 0, us->ifnum, NULL, 0); | |
1323 | } | |
e6e244b6 | 1324 | EXPORT_SYMBOL_GPL(usb_stor_Bulk_reset); |
4d07ef76 | 1325 | |
47104b0d AS |
1326 | /* Issue a USB port reset to the device. The caller must not hold |
1327 | * us->dev_mutex. | |
1328 | */ | |
4d07ef76 MD |
1329 | int usb_stor_port_reset(struct us_data *us) |
1330 | { | |
011b15df | 1331 | int result; |
4d07ef76 | 1332 | |
5d398779 ON |
1333 | /*for these devices we must use the class specific method */ |
1334 | if (us->pusb_dev->quirks & USB_QUIRK_RESET_MORPHS) | |
1335 | return -EPERM; | |
1336 | ||
011b15df | 1337 | result = usb_lock_device_for_reset(us->pusb_dev, us->pusb_intf); |
47104b0d AS |
1338 | if (result < 0) |
1339 | US_DEBUGP("unable to lock device for reset: %d\n", result); | |
1340 | else { | |
1341 | /* Were we disconnected while waiting for the lock? */ | |
7e4d6c38 | 1342 | if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { |
47104b0d AS |
1343 | result = -EIO; |
1344 | US_DEBUGP("No reset during disconnect\n"); | |
4d07ef76 | 1345 | } else { |
742120c6 ML |
1346 | result = usb_reset_device(us->pusb_dev); |
1347 | US_DEBUGP("usb_reset_device returns %d\n", | |
47104b0d | 1348 | result); |
4d07ef76 | 1349 | } |
011b15df | 1350 | usb_unlock_device(us->pusb_dev); |
4d07ef76 MD |
1351 | } |
1352 | return result; | |
1353 | } |