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1 | /* | |
2 | * USB Attached SCSI | |
3 | * Note that this is not the same as the USB Mass Storage driver | |
4 | * | |
5 | * Copyright Hans de Goede <hdegoede@redhat.com> for Red Hat, Inc. 2013 - 2014 | |
6 | * Copyright Matthew Wilcox for Intel Corp, 2010 | |
7 | * Copyright Sarah Sharp for Intel Corp, 2010 | |
8 | * | |
9 | * Distributed under the terms of the GNU GPL, version two. | |
10 | */ | |
11 | ||
12 | #include <linux/blkdev.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/types.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/usb.h> | |
17 | #include <linux/usb_usual.h> | |
18 | #include <linux/usb/hcd.h> | |
19 | #include <linux/usb/storage.h> | |
20 | #include <linux/usb/uas.h> | |
21 | ||
22 | #include <scsi/scsi.h> | |
23 | #include <scsi/scsi_eh.h> | |
24 | #include <scsi/scsi_dbg.h> | |
25 | #include <scsi/scsi_cmnd.h> | |
26 | #include <scsi/scsi_device.h> | |
27 | #include <scsi/scsi_host.h> | |
28 | #include <scsi/scsi_tcq.h> | |
29 | ||
30 | #include "uas-detect.h" | |
31 | #include "scsiglue.h" | |
32 | ||
33 | #define MAX_CMNDS 256 | |
34 | ||
35 | struct uas_dev_info { | |
36 | struct usb_interface *intf; | |
37 | struct usb_device *udev; | |
38 | struct usb_anchor cmd_urbs; | |
39 | struct usb_anchor sense_urbs; | |
40 | struct usb_anchor data_urbs; | |
41 | unsigned long flags; | |
42 | int qdepth, resetting; | |
43 | unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe; | |
44 | unsigned use_streams:1; | |
45 | unsigned shutdown:1; | |
46 | struct scsi_cmnd *cmnd[MAX_CMNDS]; | |
47 | spinlock_t lock; | |
48 | struct work_struct work; | |
49 | }; | |
50 | ||
51 | enum { | |
52 | SUBMIT_STATUS_URB = (1 << 1), | |
53 | ALLOC_DATA_IN_URB = (1 << 2), | |
54 | SUBMIT_DATA_IN_URB = (1 << 3), | |
55 | ALLOC_DATA_OUT_URB = (1 << 4), | |
56 | SUBMIT_DATA_OUT_URB = (1 << 5), | |
57 | ALLOC_CMD_URB = (1 << 6), | |
58 | SUBMIT_CMD_URB = (1 << 7), | |
59 | COMMAND_INFLIGHT = (1 << 8), | |
60 | DATA_IN_URB_INFLIGHT = (1 << 9), | |
61 | DATA_OUT_URB_INFLIGHT = (1 << 10), | |
62 | COMMAND_ABORTED = (1 << 11), | |
63 | IS_IN_WORK_LIST = (1 << 12), | |
64 | }; | |
65 | ||
66 | /* Overrides scsi_pointer */ | |
67 | struct uas_cmd_info { | |
68 | unsigned int state; | |
69 | unsigned int uas_tag; | |
70 | struct urb *cmd_urb; | |
71 | struct urb *data_in_urb; | |
72 | struct urb *data_out_urb; | |
73 | }; | |
74 | ||
75 | /* I hate forward declarations, but I actually have a loop */ | |
76 | static int uas_submit_urbs(struct scsi_cmnd *cmnd, | |
77 | struct uas_dev_info *devinfo, gfp_t gfp); | |
78 | static void uas_do_work(struct work_struct *work); | |
79 | static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller); | |
80 | static void uas_free_streams(struct uas_dev_info *devinfo); | |
81 | static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix, | |
82 | int status); | |
83 | ||
84 | static void uas_do_work(struct work_struct *work) | |
85 | { | |
86 | struct uas_dev_info *devinfo = | |
87 | container_of(work, struct uas_dev_info, work); | |
88 | struct uas_cmd_info *cmdinfo; | |
89 | struct scsi_cmnd *cmnd; | |
90 | unsigned long flags; | |
91 | int i, err; | |
92 | ||
93 | spin_lock_irqsave(&devinfo->lock, flags); | |
94 | ||
95 | if (devinfo->resetting) | |
96 | goto out; | |
97 | ||
98 | for (i = 0; i < devinfo->qdepth; i++) { | |
99 | if (!devinfo->cmnd[i]) | |
100 | continue; | |
101 | ||
102 | cmnd = devinfo->cmnd[i]; | |
103 | cmdinfo = (void *)&cmnd->SCp; | |
104 | ||
105 | if (!(cmdinfo->state & IS_IN_WORK_LIST)) | |
106 | continue; | |
107 | ||
108 | err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC); | |
109 | if (!err) | |
110 | cmdinfo->state &= ~IS_IN_WORK_LIST; | |
111 | else | |
112 | schedule_work(&devinfo->work); | |
113 | } | |
114 | out: | |
115 | spin_unlock_irqrestore(&devinfo->lock, flags); | |
116 | } | |
117 | ||
118 | static void uas_add_work(struct uas_cmd_info *cmdinfo) | |
119 | { | |
120 | struct scsi_pointer *scp = (void *)cmdinfo; | |
121 | struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp); | |
122 | struct uas_dev_info *devinfo = cmnd->device->hostdata; | |
123 | ||
124 | lockdep_assert_held(&devinfo->lock); | |
125 | cmdinfo->state |= IS_IN_WORK_LIST; | |
126 | schedule_work(&devinfo->work); | |
127 | } | |
128 | ||
129 | static void uas_zap_pending(struct uas_dev_info *devinfo, int result) | |
130 | { | |
131 | struct uas_cmd_info *cmdinfo; | |
132 | struct scsi_cmnd *cmnd; | |
133 | unsigned long flags; | |
134 | int i, err; | |
135 | ||
136 | spin_lock_irqsave(&devinfo->lock, flags); | |
137 | for (i = 0; i < devinfo->qdepth; i++) { | |
138 | if (!devinfo->cmnd[i]) | |
139 | continue; | |
140 | ||
141 | cmnd = devinfo->cmnd[i]; | |
142 | cmdinfo = (void *)&cmnd->SCp; | |
143 | uas_log_cmd_state(cmnd, __func__, 0); | |
144 | /* Sense urbs were killed, clear COMMAND_INFLIGHT manually */ | |
145 | cmdinfo->state &= ~COMMAND_INFLIGHT; | |
146 | cmnd->result = result << 16; | |
147 | err = uas_try_complete(cmnd, __func__); | |
148 | WARN_ON(err != 0); | |
149 | } | |
150 | spin_unlock_irqrestore(&devinfo->lock, flags); | |
151 | } | |
152 | ||
153 | static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd) | |
154 | { | |
155 | struct sense_iu *sense_iu = urb->transfer_buffer; | |
156 | struct scsi_device *sdev = cmnd->device; | |
157 | ||
158 | if (urb->actual_length > 16) { | |
159 | unsigned len = be16_to_cpup(&sense_iu->len); | |
160 | if (len + 16 != urb->actual_length) { | |
161 | int newlen = min(len + 16, urb->actual_length) - 16; | |
162 | if (newlen < 0) | |
163 | newlen = 0; | |
164 | sdev_printk(KERN_INFO, sdev, "%s: urb length %d " | |
165 | "disagrees with IU sense data length %d, " | |
166 | "using %d bytes of sense data\n", __func__, | |
167 | urb->actual_length, len, newlen); | |
168 | len = newlen; | |
169 | } | |
170 | memcpy(cmnd->sense_buffer, sense_iu->sense, len); | |
171 | } | |
172 | ||
173 | cmnd->result = sense_iu->status; | |
174 | } | |
175 | ||
176 | static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix, | |
177 | int status) | |
178 | { | |
179 | struct uas_cmd_info *ci = (void *)&cmnd->SCp; | |
180 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
181 | ||
182 | scmd_printk(KERN_INFO, cmnd, | |
183 | "%s %d uas-tag %d inflight:%s%s%s%s%s%s%s%s%s%s%s%s ", | |
184 | prefix, status, cmdinfo->uas_tag, | |
185 | (ci->state & SUBMIT_STATUS_URB) ? " s-st" : "", | |
186 | (ci->state & ALLOC_DATA_IN_URB) ? " a-in" : "", | |
187 | (ci->state & SUBMIT_DATA_IN_URB) ? " s-in" : "", | |
188 | (ci->state & ALLOC_DATA_OUT_URB) ? " a-out" : "", | |
189 | (ci->state & SUBMIT_DATA_OUT_URB) ? " s-out" : "", | |
190 | (ci->state & ALLOC_CMD_URB) ? " a-cmd" : "", | |
191 | (ci->state & SUBMIT_CMD_URB) ? " s-cmd" : "", | |
192 | (ci->state & COMMAND_INFLIGHT) ? " CMD" : "", | |
193 | (ci->state & DATA_IN_URB_INFLIGHT) ? " IN" : "", | |
194 | (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT" : "", | |
195 | (ci->state & COMMAND_ABORTED) ? " abort" : "", | |
196 | (ci->state & IS_IN_WORK_LIST) ? " work" : ""); | |
197 | scsi_print_command(cmnd); | |
198 | } | |
199 | ||
200 | static void uas_free_unsubmitted_urbs(struct scsi_cmnd *cmnd) | |
201 | { | |
202 | struct uas_cmd_info *cmdinfo; | |
203 | ||
204 | if (!cmnd) | |
205 | return; | |
206 | ||
207 | cmdinfo = (void *)&cmnd->SCp; | |
208 | ||
209 | if (cmdinfo->state & SUBMIT_CMD_URB) | |
210 | usb_free_urb(cmdinfo->cmd_urb); | |
211 | ||
212 | /* data urbs may have never gotten their submit flag set */ | |
213 | if (!(cmdinfo->state & DATA_IN_URB_INFLIGHT)) | |
214 | usb_free_urb(cmdinfo->data_in_urb); | |
215 | if (!(cmdinfo->state & DATA_OUT_URB_INFLIGHT)) | |
216 | usb_free_urb(cmdinfo->data_out_urb); | |
217 | } | |
218 | ||
219 | static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller) | |
220 | { | |
221 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
222 | struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata; | |
223 | ||
224 | lockdep_assert_held(&devinfo->lock); | |
225 | if (cmdinfo->state & (COMMAND_INFLIGHT | | |
226 | DATA_IN_URB_INFLIGHT | | |
227 | DATA_OUT_URB_INFLIGHT | | |
228 | COMMAND_ABORTED)) | |
229 | return -EBUSY; | |
230 | devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL; | |
231 | uas_free_unsubmitted_urbs(cmnd); | |
232 | cmnd->scsi_done(cmnd); | |
233 | return 0; | |
234 | } | |
235 | ||
236 | static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd, | |
237 | unsigned direction) | |
238 | { | |
239 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
240 | int err; | |
241 | ||
242 | cmdinfo->state |= direction | SUBMIT_STATUS_URB; | |
243 | err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC); | |
244 | if (err) { | |
245 | uas_add_work(cmdinfo); | |
246 | } | |
247 | } | |
248 | ||
249 | static void uas_stat_cmplt(struct urb *urb) | |
250 | { | |
251 | struct iu *iu = urb->transfer_buffer; | |
252 | struct Scsi_Host *shost = urb->context; | |
253 | struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; | |
254 | struct urb *data_in_urb = NULL; | |
255 | struct urb *data_out_urb = NULL; | |
256 | struct scsi_cmnd *cmnd; | |
257 | struct uas_cmd_info *cmdinfo; | |
258 | unsigned long flags; | |
259 | unsigned int idx; | |
260 | int status = urb->status; | |
261 | ||
262 | spin_lock_irqsave(&devinfo->lock, flags); | |
263 | ||
264 | if (devinfo->resetting) | |
265 | goto out; | |
266 | ||
267 | if (status) { | |
268 | if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN) | |
269 | dev_err(&urb->dev->dev, "stat urb: status %d\n", status); | |
270 | goto out; | |
271 | } | |
272 | ||
273 | idx = be16_to_cpup(&iu->tag) - 1; | |
274 | if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) { | |
275 | dev_err(&urb->dev->dev, | |
276 | "stat urb: no pending cmd for uas-tag %d\n", idx + 1); | |
277 | goto out; | |
278 | } | |
279 | ||
280 | cmnd = devinfo->cmnd[idx]; | |
281 | cmdinfo = (void *)&cmnd->SCp; | |
282 | ||
283 | if (!(cmdinfo->state & COMMAND_INFLIGHT)) { | |
284 | uas_log_cmd_state(cmnd, "unexpected status cmplt", 0); | |
285 | goto out; | |
286 | } | |
287 | ||
288 | switch (iu->iu_id) { | |
289 | case IU_ID_STATUS: | |
290 | uas_sense(urb, cmnd); | |
291 | if (cmnd->result != 0) { | |
292 | /* cancel data transfers on error */ | |
293 | data_in_urb = usb_get_urb(cmdinfo->data_in_urb); | |
294 | data_out_urb = usb_get_urb(cmdinfo->data_out_urb); | |
295 | } | |
296 | cmdinfo->state &= ~COMMAND_INFLIGHT; | |
297 | uas_try_complete(cmnd, __func__); | |
298 | break; | |
299 | case IU_ID_READ_READY: | |
300 | if (!cmdinfo->data_in_urb || | |
301 | (cmdinfo->state & DATA_IN_URB_INFLIGHT)) { | |
302 | uas_log_cmd_state(cmnd, "unexpected read rdy", 0); | |
303 | break; | |
304 | } | |
305 | uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB); | |
306 | break; | |
307 | case IU_ID_WRITE_READY: | |
308 | if (!cmdinfo->data_out_urb || | |
309 | (cmdinfo->state & DATA_OUT_URB_INFLIGHT)) { | |
310 | uas_log_cmd_state(cmnd, "unexpected write rdy", 0); | |
311 | break; | |
312 | } | |
313 | uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB); | |
314 | break; | |
315 | case IU_ID_RESPONSE: | |
316 | uas_log_cmd_state(cmnd, "unexpected response iu", | |
317 | ((struct response_iu *)iu)->response_code); | |
318 | /* Error, cancel data transfers */ | |
319 | data_in_urb = usb_get_urb(cmdinfo->data_in_urb); | |
320 | data_out_urb = usb_get_urb(cmdinfo->data_out_urb); | |
321 | cmdinfo->state &= ~COMMAND_INFLIGHT; | |
322 | cmnd->result = DID_ERROR << 16; | |
323 | uas_try_complete(cmnd, __func__); | |
324 | break; | |
325 | default: | |
326 | uas_log_cmd_state(cmnd, "bogus IU", iu->iu_id); | |
327 | } | |
328 | out: | |
329 | usb_free_urb(urb); | |
330 | spin_unlock_irqrestore(&devinfo->lock, flags); | |
331 | ||
332 | /* Unlinking of data urbs must be done without holding the lock */ | |
333 | if (data_in_urb) { | |
334 | usb_unlink_urb(data_in_urb); | |
335 | usb_put_urb(data_in_urb); | |
336 | } | |
337 | if (data_out_urb) { | |
338 | usb_unlink_urb(data_out_urb); | |
339 | usb_put_urb(data_out_urb); | |
340 | } | |
341 | } | |
342 | ||
343 | static void uas_data_cmplt(struct urb *urb) | |
344 | { | |
345 | struct scsi_cmnd *cmnd = urb->context; | |
346 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
347 | struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata; | |
348 | struct scsi_data_buffer *sdb = NULL; | |
349 | unsigned long flags; | |
350 | int status = urb->status; | |
351 | ||
352 | spin_lock_irqsave(&devinfo->lock, flags); | |
353 | ||
354 | if (cmdinfo->data_in_urb == urb) { | |
355 | sdb = scsi_in(cmnd); | |
356 | cmdinfo->state &= ~DATA_IN_URB_INFLIGHT; | |
357 | cmdinfo->data_in_urb = NULL; | |
358 | } else if (cmdinfo->data_out_urb == urb) { | |
359 | sdb = scsi_out(cmnd); | |
360 | cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT; | |
361 | cmdinfo->data_out_urb = NULL; | |
362 | } | |
363 | if (sdb == NULL) { | |
364 | WARN_ON_ONCE(1); | |
365 | goto out; | |
366 | } | |
367 | ||
368 | if (devinfo->resetting) | |
369 | goto out; | |
370 | ||
371 | /* Data urbs should not complete before the cmd urb is submitted */ | |
372 | if (cmdinfo->state & SUBMIT_CMD_URB) { | |
373 | uas_log_cmd_state(cmnd, "unexpected data cmplt", 0); | |
374 | goto out; | |
375 | } | |
376 | ||
377 | if (status) { | |
378 | if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN) | |
379 | uas_log_cmd_state(cmnd, "data cmplt err", status); | |
380 | /* error: no data transfered */ | |
381 | sdb->resid = sdb->length; | |
382 | } else { | |
383 | sdb->resid = sdb->length - urb->actual_length; | |
384 | } | |
385 | uas_try_complete(cmnd, __func__); | |
386 | out: | |
387 | usb_free_urb(urb); | |
388 | spin_unlock_irqrestore(&devinfo->lock, flags); | |
389 | } | |
390 | ||
391 | static void uas_cmd_cmplt(struct urb *urb) | |
392 | { | |
393 | if (urb->status) | |
394 | dev_err(&urb->dev->dev, "cmd cmplt err %d\n", urb->status); | |
395 | ||
396 | usb_free_urb(urb); | |
397 | } | |
398 | ||
399 | static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp, | |
400 | struct scsi_cmnd *cmnd, | |
401 | enum dma_data_direction dir) | |
402 | { | |
403 | struct usb_device *udev = devinfo->udev; | |
404 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
405 | struct urb *urb = usb_alloc_urb(0, gfp); | |
406 | struct scsi_data_buffer *sdb = (dir == DMA_FROM_DEVICE) | |
407 | ? scsi_in(cmnd) : scsi_out(cmnd); | |
408 | unsigned int pipe = (dir == DMA_FROM_DEVICE) | |
409 | ? devinfo->data_in_pipe : devinfo->data_out_pipe; | |
410 | ||
411 | if (!urb) | |
412 | goto out; | |
413 | usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length, | |
414 | uas_data_cmplt, cmnd); | |
415 | if (devinfo->use_streams) | |
416 | urb->stream_id = cmdinfo->uas_tag; | |
417 | urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0; | |
418 | urb->sg = sdb->table.sgl; | |
419 | out: | |
420 | return urb; | |
421 | } | |
422 | ||
423 | static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp, | |
424 | struct scsi_cmnd *cmnd) | |
425 | { | |
426 | struct usb_device *udev = devinfo->udev; | |
427 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
428 | struct urb *urb = usb_alloc_urb(0, gfp); | |
429 | struct sense_iu *iu; | |
430 | ||
431 | if (!urb) | |
432 | goto out; | |
433 | ||
434 | iu = kzalloc(sizeof(*iu), gfp); | |
435 | if (!iu) | |
436 | goto free; | |
437 | ||
438 | usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu), | |
439 | uas_stat_cmplt, cmnd->device->host); | |
440 | if (devinfo->use_streams) | |
441 | urb->stream_id = cmdinfo->uas_tag; | |
442 | urb->transfer_flags |= URB_FREE_BUFFER; | |
443 | out: | |
444 | return urb; | |
445 | free: | |
446 | usb_free_urb(urb); | |
447 | return NULL; | |
448 | } | |
449 | ||
450 | static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp, | |
451 | struct scsi_cmnd *cmnd) | |
452 | { | |
453 | struct usb_device *udev = devinfo->udev; | |
454 | struct scsi_device *sdev = cmnd->device; | |
455 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
456 | struct urb *urb = usb_alloc_urb(0, gfp); | |
457 | struct command_iu *iu; | |
458 | int len; | |
459 | ||
460 | if (!urb) | |
461 | goto out; | |
462 | ||
463 | len = cmnd->cmd_len - 16; | |
464 | if (len < 0) | |
465 | len = 0; | |
466 | len = ALIGN(len, 4); | |
467 | iu = kzalloc(sizeof(*iu) + len, gfp); | |
468 | if (!iu) | |
469 | goto free; | |
470 | ||
471 | iu->iu_id = IU_ID_COMMAND; | |
472 | iu->tag = cpu_to_be16(cmdinfo->uas_tag); | |
473 | iu->prio_attr = UAS_SIMPLE_TAG; | |
474 | iu->len = len; | |
475 | int_to_scsilun(sdev->lun, &iu->lun); | |
476 | memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len); | |
477 | ||
478 | usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len, | |
479 | uas_cmd_cmplt, NULL); | |
480 | urb->transfer_flags |= URB_FREE_BUFFER; | |
481 | out: | |
482 | return urb; | |
483 | free: | |
484 | usb_free_urb(urb); | |
485 | return NULL; | |
486 | } | |
487 | ||
488 | /* | |
489 | * Why should I request the Status IU before sending the Command IU? Spec | |
490 | * says to, but also says the device may receive them in any order. Seems | |
491 | * daft to me. | |
492 | */ | |
493 | ||
494 | static struct urb *uas_submit_sense_urb(struct scsi_cmnd *cmnd, gfp_t gfp) | |
495 | { | |
496 | struct uas_dev_info *devinfo = cmnd->device->hostdata; | |
497 | struct urb *urb; | |
498 | int err; | |
499 | ||
500 | urb = uas_alloc_sense_urb(devinfo, gfp, cmnd); | |
501 | if (!urb) | |
502 | return NULL; | |
503 | usb_anchor_urb(urb, &devinfo->sense_urbs); | |
504 | err = usb_submit_urb(urb, gfp); | |
505 | if (err) { | |
506 | usb_unanchor_urb(urb); | |
507 | uas_log_cmd_state(cmnd, "sense submit err", err); | |
508 | usb_free_urb(urb); | |
509 | return NULL; | |
510 | } | |
511 | return urb; | |
512 | } | |
513 | ||
514 | static int uas_submit_urbs(struct scsi_cmnd *cmnd, | |
515 | struct uas_dev_info *devinfo, gfp_t gfp) | |
516 | { | |
517 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
518 | struct urb *urb; | |
519 | int err; | |
520 | ||
521 | lockdep_assert_held(&devinfo->lock); | |
522 | if (cmdinfo->state & SUBMIT_STATUS_URB) { | |
523 | urb = uas_submit_sense_urb(cmnd, gfp); | |
524 | if (!urb) | |
525 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
526 | cmdinfo->state &= ~SUBMIT_STATUS_URB; | |
527 | } | |
528 | ||
529 | if (cmdinfo->state & ALLOC_DATA_IN_URB) { | |
530 | cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, gfp, | |
531 | cmnd, DMA_FROM_DEVICE); | |
532 | if (!cmdinfo->data_in_urb) | |
533 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
534 | cmdinfo->state &= ~ALLOC_DATA_IN_URB; | |
535 | } | |
536 | ||
537 | if (cmdinfo->state & SUBMIT_DATA_IN_URB) { | |
538 | usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs); | |
539 | err = usb_submit_urb(cmdinfo->data_in_urb, gfp); | |
540 | if (err) { | |
541 | usb_unanchor_urb(cmdinfo->data_in_urb); | |
542 | uas_log_cmd_state(cmnd, "data in submit err", err); | |
543 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
544 | } | |
545 | cmdinfo->state &= ~SUBMIT_DATA_IN_URB; | |
546 | cmdinfo->state |= DATA_IN_URB_INFLIGHT; | |
547 | } | |
548 | ||
549 | if (cmdinfo->state & ALLOC_DATA_OUT_URB) { | |
550 | cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, gfp, | |
551 | cmnd, DMA_TO_DEVICE); | |
552 | if (!cmdinfo->data_out_urb) | |
553 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
554 | cmdinfo->state &= ~ALLOC_DATA_OUT_URB; | |
555 | } | |
556 | ||
557 | if (cmdinfo->state & SUBMIT_DATA_OUT_URB) { | |
558 | usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs); | |
559 | err = usb_submit_urb(cmdinfo->data_out_urb, gfp); | |
560 | if (err) { | |
561 | usb_unanchor_urb(cmdinfo->data_out_urb); | |
562 | uas_log_cmd_state(cmnd, "data out submit err", err); | |
563 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
564 | } | |
565 | cmdinfo->state &= ~SUBMIT_DATA_OUT_URB; | |
566 | cmdinfo->state |= DATA_OUT_URB_INFLIGHT; | |
567 | } | |
568 | ||
569 | if (cmdinfo->state & ALLOC_CMD_URB) { | |
570 | cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, gfp, cmnd); | |
571 | if (!cmdinfo->cmd_urb) | |
572 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
573 | cmdinfo->state &= ~ALLOC_CMD_URB; | |
574 | } | |
575 | ||
576 | if (cmdinfo->state & SUBMIT_CMD_URB) { | |
577 | usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs); | |
578 | err = usb_submit_urb(cmdinfo->cmd_urb, gfp); | |
579 | if (err) { | |
580 | usb_unanchor_urb(cmdinfo->cmd_urb); | |
581 | uas_log_cmd_state(cmnd, "cmd submit err", err); | |
582 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
583 | } | |
584 | cmdinfo->cmd_urb = NULL; | |
585 | cmdinfo->state &= ~SUBMIT_CMD_URB; | |
586 | cmdinfo->state |= COMMAND_INFLIGHT; | |
587 | } | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
592 | static int uas_queuecommand_lck(struct scsi_cmnd *cmnd, | |
593 | void (*done)(struct scsi_cmnd *)) | |
594 | { | |
595 | struct scsi_device *sdev = cmnd->device; | |
596 | struct uas_dev_info *devinfo = sdev->hostdata; | |
597 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
598 | unsigned long flags; | |
599 | int idx, err; | |
600 | ||
601 | BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer)); | |
602 | ||
603 | /* Re-check scsi_block_requests now that we've the host-lock */ | |
604 | if (cmnd->device->host->host_self_blocked) | |
605 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
606 | ||
607 | if ((devinfo->flags & US_FL_NO_ATA_1X) && | |
608 | (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) { | |
609 | memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB, | |
610 | sizeof(usb_stor_sense_invalidCDB)); | |
611 | cmnd->result = SAM_STAT_CHECK_CONDITION; | |
612 | cmnd->scsi_done(cmnd); | |
613 | return 0; | |
614 | } | |
615 | ||
616 | spin_lock_irqsave(&devinfo->lock, flags); | |
617 | ||
618 | if (devinfo->resetting) { | |
619 | cmnd->result = DID_ERROR << 16; | |
620 | cmnd->scsi_done(cmnd); | |
621 | spin_unlock_irqrestore(&devinfo->lock, flags); | |
622 | return 0; | |
623 | } | |
624 | ||
625 | /* Find a free uas-tag */ | |
626 | for (idx = 0; idx < devinfo->qdepth; idx++) { | |
627 | if (!devinfo->cmnd[idx]) | |
628 | break; | |
629 | } | |
630 | if (idx == devinfo->qdepth) { | |
631 | spin_unlock_irqrestore(&devinfo->lock, flags); | |
632 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
633 | } | |
634 | ||
635 | cmnd->scsi_done = done; | |
636 | ||
637 | memset(cmdinfo, 0, sizeof(*cmdinfo)); | |
638 | cmdinfo->uas_tag = idx + 1; /* uas-tag == usb-stream-id, so 1 based */ | |
639 | cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB; | |
640 | ||
641 | switch (cmnd->sc_data_direction) { | |
642 | case DMA_FROM_DEVICE: | |
643 | cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB; | |
644 | break; | |
645 | case DMA_BIDIRECTIONAL: | |
646 | cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB; | |
647 | case DMA_TO_DEVICE: | |
648 | cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB; | |
649 | case DMA_NONE: | |
650 | break; | |
651 | } | |
652 | ||
653 | if (!devinfo->use_streams) | |
654 | cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB); | |
655 | ||
656 | err = uas_submit_urbs(cmnd, devinfo, GFP_ATOMIC); | |
657 | if (err) { | |
658 | /* If we did nothing, give up now */ | |
659 | if (cmdinfo->state & SUBMIT_STATUS_URB) { | |
660 | spin_unlock_irqrestore(&devinfo->lock, flags); | |
661 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
662 | } | |
663 | uas_add_work(cmdinfo); | |
664 | } | |
665 | ||
666 | devinfo->cmnd[idx] = cmnd; | |
667 | spin_unlock_irqrestore(&devinfo->lock, flags); | |
668 | return 0; | |
669 | } | |
670 | ||
671 | static DEF_SCSI_QCMD(uas_queuecommand) | |
672 | ||
673 | /* | |
674 | * For now we do not support actually sending an abort to the device, so | |
675 | * this eh always fails. Still we must define it to make sure that we've | |
676 | * dropped all references to the cmnd in question once this function exits. | |
677 | */ | |
678 | static int uas_eh_abort_handler(struct scsi_cmnd *cmnd) | |
679 | { | |
680 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
681 | struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata; | |
682 | struct urb *data_in_urb = NULL; | |
683 | struct urb *data_out_urb = NULL; | |
684 | unsigned long flags; | |
685 | ||
686 | spin_lock_irqsave(&devinfo->lock, flags); | |
687 | ||
688 | uas_log_cmd_state(cmnd, __func__, 0); | |
689 | ||
690 | /* Ensure that try_complete does not call scsi_done */ | |
691 | cmdinfo->state |= COMMAND_ABORTED; | |
692 | ||
693 | /* Drop all refs to this cmnd, kill data urbs to break their ref */ | |
694 | devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL; | |
695 | if (cmdinfo->state & DATA_IN_URB_INFLIGHT) | |
696 | data_in_urb = usb_get_urb(cmdinfo->data_in_urb); | |
697 | if (cmdinfo->state & DATA_OUT_URB_INFLIGHT) | |
698 | data_out_urb = usb_get_urb(cmdinfo->data_out_urb); | |
699 | ||
700 | uas_free_unsubmitted_urbs(cmnd); | |
701 | ||
702 | spin_unlock_irqrestore(&devinfo->lock, flags); | |
703 | ||
704 | if (data_in_urb) { | |
705 | usb_kill_urb(data_in_urb); | |
706 | usb_put_urb(data_in_urb); | |
707 | } | |
708 | if (data_out_urb) { | |
709 | usb_kill_urb(data_out_urb); | |
710 | usb_put_urb(data_out_urb); | |
711 | } | |
712 | ||
713 | return FAILED; | |
714 | } | |
715 | ||
716 | static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd) | |
717 | { | |
718 | struct scsi_device *sdev = cmnd->device; | |
719 | struct uas_dev_info *devinfo = sdev->hostdata; | |
720 | struct usb_device *udev = devinfo->udev; | |
721 | unsigned long flags; | |
722 | int err; | |
723 | ||
724 | err = usb_lock_device_for_reset(udev, devinfo->intf); | |
725 | if (err) { | |
726 | shost_printk(KERN_ERR, sdev->host, | |
727 | "%s FAILED to get lock err %d\n", __func__, err); | |
728 | return FAILED; | |
729 | } | |
730 | ||
731 | shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__); | |
732 | ||
733 | spin_lock_irqsave(&devinfo->lock, flags); | |
734 | devinfo->resetting = 1; | |
735 | spin_unlock_irqrestore(&devinfo->lock, flags); | |
736 | ||
737 | usb_kill_anchored_urbs(&devinfo->cmd_urbs); | |
738 | usb_kill_anchored_urbs(&devinfo->sense_urbs); | |
739 | usb_kill_anchored_urbs(&devinfo->data_urbs); | |
740 | uas_zap_pending(devinfo, DID_RESET); | |
741 | ||
742 | err = usb_reset_device(udev); | |
743 | ||
744 | spin_lock_irqsave(&devinfo->lock, flags); | |
745 | devinfo->resetting = 0; | |
746 | spin_unlock_irqrestore(&devinfo->lock, flags); | |
747 | ||
748 | usb_unlock_device(udev); | |
749 | ||
750 | if (err) { | |
751 | shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n", | |
752 | __func__, err); | |
753 | return FAILED; | |
754 | } | |
755 | ||
756 | shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__); | |
757 | return SUCCESS; | |
758 | } | |
759 | ||
760 | static int uas_slave_alloc(struct scsi_device *sdev) | |
761 | { | |
762 | struct uas_dev_info *devinfo = | |
763 | (struct uas_dev_info *)sdev->host->hostdata; | |
764 | ||
765 | sdev->hostdata = devinfo; | |
766 | ||
767 | /* USB has unusual DMA-alignment requirements: Although the | |
768 | * starting address of each scatter-gather element doesn't matter, | |
769 | * the length of each element except the last must be divisible | |
770 | * by the Bulk maxpacket value. There's currently no way to | |
771 | * express this by block-layer constraints, so we'll cop out | |
772 | * and simply require addresses to be aligned at 512-byte | |
773 | * boundaries. This is okay since most block I/O involves | |
774 | * hardware sectors that are multiples of 512 bytes in length, | |
775 | * and since host controllers up through USB 2.0 have maxpacket | |
776 | * values no larger than 512. | |
777 | * | |
778 | * But it doesn't suffice for Wireless USB, where Bulk maxpacket | |
779 | * values can be as large as 2048. To make that work properly | |
780 | * will require changes to the block layer. | |
781 | */ | |
782 | blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1)); | |
783 | ||
784 | if (devinfo->flags & US_FL_MAX_SECTORS_64) | |
785 | blk_queue_max_hw_sectors(sdev->request_queue, 64); | |
786 | else if (devinfo->flags & US_FL_MAX_SECTORS_240) | |
787 | blk_queue_max_hw_sectors(sdev->request_queue, 240); | |
788 | ||
789 | return 0; | |
790 | } | |
791 | ||
792 | static int uas_slave_configure(struct scsi_device *sdev) | |
793 | { | |
794 | struct uas_dev_info *devinfo = sdev->hostdata; | |
795 | ||
796 | if (devinfo->flags & US_FL_NO_REPORT_OPCODES) | |
797 | sdev->no_report_opcodes = 1; | |
798 | ||
799 | scsi_change_queue_depth(sdev, devinfo->qdepth - 2); | |
800 | return 0; | |
801 | } | |
802 | ||
803 | static struct scsi_host_template uas_host_template = { | |
804 | .module = THIS_MODULE, | |
805 | .name = "uas", | |
806 | .queuecommand = uas_queuecommand, | |
807 | .slave_alloc = uas_slave_alloc, | |
808 | .slave_configure = uas_slave_configure, | |
809 | .eh_abort_handler = uas_eh_abort_handler, | |
810 | .eh_bus_reset_handler = uas_eh_bus_reset_handler, | |
811 | .can_queue = 65536, /* Is there a limit on the _host_ ? */ | |
812 | .this_id = -1, | |
813 | .sg_tablesize = SG_NONE, | |
814 | .skip_settle_delay = 1, | |
815 | }; | |
816 | ||
817 | #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \ | |
818 | vendorName, productName, useProtocol, useTransport, \ | |
819 | initFunction, flags) \ | |
820 | { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \ | |
821 | .driver_info = (flags) } | |
822 | ||
823 | static struct usb_device_id uas_usb_ids[] = { | |
824 | # include "unusual_uas.h" | |
825 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) }, | |
826 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) }, | |
827 | { } | |
828 | }; | |
829 | MODULE_DEVICE_TABLE(usb, uas_usb_ids); | |
830 | ||
831 | #undef UNUSUAL_DEV | |
832 | ||
833 | static int uas_switch_interface(struct usb_device *udev, | |
834 | struct usb_interface *intf) | |
835 | { | |
836 | int alt; | |
837 | ||
838 | alt = uas_find_uas_alt_setting(intf); | |
839 | if (alt < 0) | |
840 | return alt; | |
841 | ||
842 | return usb_set_interface(udev, | |
843 | intf->altsetting[0].desc.bInterfaceNumber, alt); | |
844 | } | |
845 | ||
846 | static int uas_configure_endpoints(struct uas_dev_info *devinfo) | |
847 | { | |
848 | struct usb_host_endpoint *eps[4] = { }; | |
849 | struct usb_device *udev = devinfo->udev; | |
850 | int r; | |
851 | ||
852 | r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps); | |
853 | if (r) | |
854 | return r; | |
855 | ||
856 | devinfo->cmd_pipe = usb_sndbulkpipe(udev, | |
857 | usb_endpoint_num(&eps[0]->desc)); | |
858 | devinfo->status_pipe = usb_rcvbulkpipe(udev, | |
859 | usb_endpoint_num(&eps[1]->desc)); | |
860 | devinfo->data_in_pipe = usb_rcvbulkpipe(udev, | |
861 | usb_endpoint_num(&eps[2]->desc)); | |
862 | devinfo->data_out_pipe = usb_sndbulkpipe(udev, | |
863 | usb_endpoint_num(&eps[3]->desc)); | |
864 | ||
865 | if (udev->speed < USB_SPEED_SUPER) { | |
866 | devinfo->qdepth = 32; | |
867 | devinfo->use_streams = 0; | |
868 | } else { | |
869 | devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1, | |
870 | 3, MAX_CMNDS, GFP_NOIO); | |
871 | if (devinfo->qdepth < 0) | |
872 | return devinfo->qdepth; | |
873 | devinfo->use_streams = 1; | |
874 | } | |
875 | ||
876 | return 0; | |
877 | } | |
878 | ||
879 | static void uas_free_streams(struct uas_dev_info *devinfo) | |
880 | { | |
881 | struct usb_device *udev = devinfo->udev; | |
882 | struct usb_host_endpoint *eps[3]; | |
883 | ||
884 | eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe); | |
885 | eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe); | |
886 | eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe); | |
887 | usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO); | |
888 | } | |
889 | ||
890 | static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
891 | { | |
892 | int result = -ENOMEM; | |
893 | struct Scsi_Host *shost = NULL; | |
894 | struct uas_dev_info *devinfo; | |
895 | struct usb_device *udev = interface_to_usbdev(intf); | |
896 | unsigned long dev_flags; | |
897 | ||
898 | if (!uas_use_uas_driver(intf, id, &dev_flags)) | |
899 | return -ENODEV; | |
900 | ||
901 | if (uas_switch_interface(udev, intf)) | |
902 | return -ENODEV; | |
903 | ||
904 | shost = scsi_host_alloc(&uas_host_template, | |
905 | sizeof(struct uas_dev_info)); | |
906 | if (!shost) | |
907 | goto set_alt0; | |
908 | ||
909 | shost->max_cmd_len = 16 + 252; | |
910 | shost->max_id = 1; | |
911 | shost->max_lun = 256; | |
912 | shost->max_channel = 0; | |
913 | shost->sg_tablesize = udev->bus->sg_tablesize; | |
914 | ||
915 | devinfo = (struct uas_dev_info *)shost->hostdata; | |
916 | devinfo->intf = intf; | |
917 | devinfo->udev = udev; | |
918 | devinfo->resetting = 0; | |
919 | devinfo->shutdown = 0; | |
920 | devinfo->flags = dev_flags; | |
921 | init_usb_anchor(&devinfo->cmd_urbs); | |
922 | init_usb_anchor(&devinfo->sense_urbs); | |
923 | init_usb_anchor(&devinfo->data_urbs); | |
924 | spin_lock_init(&devinfo->lock); | |
925 | INIT_WORK(&devinfo->work, uas_do_work); | |
926 | ||
927 | result = uas_configure_endpoints(devinfo); | |
928 | if (result) | |
929 | goto set_alt0; | |
930 | ||
931 | usb_set_intfdata(intf, shost); | |
932 | result = scsi_add_host(shost, &intf->dev); | |
933 | if (result) | |
934 | goto free_streams; | |
935 | ||
936 | scsi_scan_host(shost); | |
937 | return result; | |
938 | ||
939 | free_streams: | |
940 | uas_free_streams(devinfo); | |
941 | usb_set_intfdata(intf, NULL); | |
942 | set_alt0: | |
943 | usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0); | |
944 | if (shost) | |
945 | scsi_host_put(shost); | |
946 | return result; | |
947 | } | |
948 | ||
949 | static int uas_cmnd_list_empty(struct uas_dev_info *devinfo) | |
950 | { | |
951 | unsigned long flags; | |
952 | int i, r = 1; | |
953 | ||
954 | spin_lock_irqsave(&devinfo->lock, flags); | |
955 | ||
956 | for (i = 0; i < devinfo->qdepth; i++) { | |
957 | if (devinfo->cmnd[i]) { | |
958 | r = 0; /* Not empty */ | |
959 | break; | |
960 | } | |
961 | } | |
962 | ||
963 | spin_unlock_irqrestore(&devinfo->lock, flags); | |
964 | ||
965 | return r; | |
966 | } | |
967 | ||
968 | /* | |
969 | * Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily | |
970 | * get empty while there still is more work to do due to sense-urbs completing | |
971 | * with a READ/WRITE_READY iu code, so keep waiting until the list gets empty. | |
972 | */ | |
973 | static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo) | |
974 | { | |
975 | unsigned long start_time; | |
976 | int r; | |
977 | ||
978 | start_time = jiffies; | |
979 | do { | |
980 | flush_work(&devinfo->work); | |
981 | ||
982 | r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000); | |
983 | if (r == 0) | |
984 | return -ETIME; | |
985 | ||
986 | r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500); | |
987 | if (r == 0) | |
988 | return -ETIME; | |
989 | ||
990 | if (time_after(jiffies, start_time + 5 * HZ)) | |
991 | return -ETIME; | |
992 | } while (!uas_cmnd_list_empty(devinfo)); | |
993 | ||
994 | return 0; | |
995 | } | |
996 | ||
997 | static int uas_pre_reset(struct usb_interface *intf) | |
998 | { | |
999 | struct Scsi_Host *shost = usb_get_intfdata(intf); | |
1000 | struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; | |
1001 | unsigned long flags; | |
1002 | ||
1003 | if (devinfo->shutdown) | |
1004 | return 0; | |
1005 | ||
1006 | /* Block new requests */ | |
1007 | spin_lock_irqsave(shost->host_lock, flags); | |
1008 | scsi_block_requests(shost); | |
1009 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1010 | ||
1011 | if (uas_wait_for_pending_cmnds(devinfo) != 0) { | |
1012 | shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__); | |
1013 | scsi_unblock_requests(shost); | |
1014 | return 1; | |
1015 | } | |
1016 | ||
1017 | uas_free_streams(devinfo); | |
1018 | ||
1019 | return 0; | |
1020 | } | |
1021 | ||
1022 | static int uas_post_reset(struct usb_interface *intf) | |
1023 | { | |
1024 | struct Scsi_Host *shost = usb_get_intfdata(intf); | |
1025 | struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; | |
1026 | unsigned long flags; | |
1027 | int err; | |
1028 | ||
1029 | if (devinfo->shutdown) | |
1030 | return 0; | |
1031 | ||
1032 | err = uas_configure_endpoints(devinfo); | |
1033 | if (err) { | |
1034 | shost_printk(KERN_ERR, shost, | |
1035 | "%s: alloc streams error %d after reset", | |
1036 | __func__, err); | |
1037 | return 1; | |
1038 | } | |
1039 | ||
1040 | spin_lock_irqsave(shost->host_lock, flags); | |
1041 | scsi_report_bus_reset(shost, 0); | |
1042 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1043 | ||
1044 | scsi_unblock_requests(shost); | |
1045 | ||
1046 | return 0; | |
1047 | } | |
1048 | ||
1049 | static int uas_suspend(struct usb_interface *intf, pm_message_t message) | |
1050 | { | |
1051 | struct Scsi_Host *shost = usb_get_intfdata(intf); | |
1052 | struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; | |
1053 | ||
1054 | if (uas_wait_for_pending_cmnds(devinfo) != 0) { | |
1055 | shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__); | |
1056 | return -ETIME; | |
1057 | } | |
1058 | ||
1059 | return 0; | |
1060 | } | |
1061 | ||
1062 | static int uas_resume(struct usb_interface *intf) | |
1063 | { | |
1064 | return 0; | |
1065 | } | |
1066 | ||
1067 | static int uas_reset_resume(struct usb_interface *intf) | |
1068 | { | |
1069 | struct Scsi_Host *shost = usb_get_intfdata(intf); | |
1070 | struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; | |
1071 | unsigned long flags; | |
1072 | int err; | |
1073 | ||
1074 | err = uas_configure_endpoints(devinfo); | |
1075 | if (err) { | |
1076 | shost_printk(KERN_ERR, shost, | |
1077 | "%s: alloc streams error %d after reset", | |
1078 | __func__, err); | |
1079 | return -EIO; | |
1080 | } | |
1081 | ||
1082 | spin_lock_irqsave(shost->host_lock, flags); | |
1083 | scsi_report_bus_reset(shost, 0); | |
1084 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1085 | ||
1086 | return 0; | |
1087 | } | |
1088 | ||
1089 | static void uas_disconnect(struct usb_interface *intf) | |
1090 | { | |
1091 | struct Scsi_Host *shost = usb_get_intfdata(intf); | |
1092 | struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; | |
1093 | unsigned long flags; | |
1094 | ||
1095 | spin_lock_irqsave(&devinfo->lock, flags); | |
1096 | devinfo->resetting = 1; | |
1097 | spin_unlock_irqrestore(&devinfo->lock, flags); | |
1098 | ||
1099 | cancel_work_sync(&devinfo->work); | |
1100 | usb_kill_anchored_urbs(&devinfo->cmd_urbs); | |
1101 | usb_kill_anchored_urbs(&devinfo->sense_urbs); | |
1102 | usb_kill_anchored_urbs(&devinfo->data_urbs); | |
1103 | uas_zap_pending(devinfo, DID_NO_CONNECT); | |
1104 | ||
1105 | scsi_remove_host(shost); | |
1106 | uas_free_streams(devinfo); | |
1107 | scsi_host_put(shost); | |
1108 | } | |
1109 | ||
1110 | /* | |
1111 | * Put the device back in usb-storage mode on shutdown, as some BIOS-es | |
1112 | * hang on reboot when the device is still in uas mode. Note the reset is | |
1113 | * necessary as some devices won't revert to usb-storage mode without it. | |
1114 | */ | |
1115 | static void uas_shutdown(struct device *dev) | |
1116 | { | |
1117 | struct usb_interface *intf = to_usb_interface(dev); | |
1118 | struct usb_device *udev = interface_to_usbdev(intf); | |
1119 | struct Scsi_Host *shost = usb_get_intfdata(intf); | |
1120 | struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; | |
1121 | ||
1122 | if (system_state != SYSTEM_RESTART) | |
1123 | return; | |
1124 | ||
1125 | devinfo->shutdown = 1; | |
1126 | uas_free_streams(devinfo); | |
1127 | usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0); | |
1128 | usb_reset_device(udev); | |
1129 | } | |
1130 | ||
1131 | static struct usb_driver uas_driver = { | |
1132 | .name = "uas", | |
1133 | .probe = uas_probe, | |
1134 | .disconnect = uas_disconnect, | |
1135 | .pre_reset = uas_pre_reset, | |
1136 | .post_reset = uas_post_reset, | |
1137 | .suspend = uas_suspend, | |
1138 | .resume = uas_resume, | |
1139 | .reset_resume = uas_reset_resume, | |
1140 | .drvwrap.driver.shutdown = uas_shutdown, | |
1141 | .id_table = uas_usb_ids, | |
1142 | }; | |
1143 | ||
1144 | module_usb_driver(uas_driver); | |
1145 | ||
1146 | MODULE_LICENSE("GPL"); | |
1147 | MODULE_AUTHOR( | |
1148 | "Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp"); |