Commit | Line | Data |
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115bb1ff MW |
1 | /* |
2 | * USB Attached SCSI | |
3 | * Note that this is not the same as the USB Mass Storage driver | |
4 | * | |
5 | * Copyright Matthew Wilcox for Intel Corp, 2010 | |
6 | * Copyright Sarah Sharp for Intel Corp, 2010 | |
7 | * | |
8 | * Distributed under the terms of the GNU GPL, version two. | |
9 | */ | |
10 | ||
11 | #include <linux/blkdev.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/types.h> | |
6eb0de82 | 14 | #include <linux/module.h> |
115bb1ff MW |
15 | #include <linux/usb.h> |
16 | #include <linux/usb/storage.h> | |
17 | ||
18 | #include <scsi/scsi.h> | |
19 | #include <scsi/scsi_dbg.h> | |
20 | #include <scsi/scsi_cmnd.h> | |
21 | #include <scsi/scsi_device.h> | |
22 | #include <scsi/scsi_host.h> | |
23 | #include <scsi/scsi_tcq.h> | |
24 | ||
25 | /* Common header for all IUs */ | |
26 | struct iu { | |
27 | __u8 iu_id; | |
28 | __u8 rsvd1; | |
29 | __be16 tag; | |
30 | }; | |
31 | ||
32 | enum { | |
33 | IU_ID_COMMAND = 0x01, | |
34 | IU_ID_STATUS = 0x03, | |
35 | IU_ID_RESPONSE = 0x04, | |
36 | IU_ID_TASK_MGMT = 0x05, | |
37 | IU_ID_READ_READY = 0x06, | |
38 | IU_ID_WRITE_READY = 0x07, | |
39 | }; | |
40 | ||
41 | struct command_iu { | |
42 | __u8 iu_id; | |
43 | __u8 rsvd1; | |
44 | __be16 tag; | |
45 | __u8 prio_attr; | |
46 | __u8 rsvd5; | |
47 | __u8 len; | |
48 | __u8 rsvd7; | |
49 | struct scsi_lun lun; | |
50 | __u8 cdb[16]; /* XXX: Overflow-checking tools may misunderstand */ | |
51 | }; | |
52 | ||
4400ef31 MW |
53 | /* |
54 | * Also used for the Read Ready and Write Ready IUs since they have the | |
55 | * same first four bytes | |
56 | */ | |
115bb1ff MW |
57 | struct sense_iu { |
58 | __u8 iu_id; | |
59 | __u8 rsvd1; | |
60 | __be16 tag; | |
61 | __be16 status_qual; | |
62 | __u8 status; | |
4400ef31 | 63 | __u8 rsvd7[7]; |
115bb1ff MW |
64 | __be16 len; |
65 | __u8 sense[SCSI_SENSE_BUFFERSIZE]; | |
66 | }; | |
67 | ||
68 | /* | |
69 | * The r00-r01c specs define this version of the SENSE IU data structure. | |
70 | * It's still in use by several different firmware releases. | |
71 | */ | |
72 | struct sense_iu_old { | |
73 | __u8 iu_id; | |
74 | __u8 rsvd1; | |
75 | __be16 tag; | |
76 | __be16 len; | |
77 | __u8 status; | |
78 | __u8 service_response; | |
79 | __u8 sense[SCSI_SENSE_BUFFERSIZE]; | |
80 | }; | |
81 | ||
82 | enum { | |
83 | CMD_PIPE_ID = 1, | |
84 | STATUS_PIPE_ID = 2, | |
85 | DATA_IN_PIPE_ID = 3, | |
86 | DATA_OUT_PIPE_ID = 4, | |
87 | ||
88 | UAS_SIMPLE_TAG = 0, | |
89 | UAS_HEAD_TAG = 1, | |
90 | UAS_ORDERED_TAG = 2, | |
91 | UAS_ACA = 4, | |
92 | }; | |
93 | ||
94 | struct uas_dev_info { | |
95 | struct usb_interface *intf; | |
96 | struct usb_device *udev; | |
97 | int qdepth; | |
98 | unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe; | |
99 | unsigned use_streams:1; | |
100 | unsigned uas_sense_old:1; | |
101 | }; | |
102 | ||
103 | enum { | |
92a3f767 MW |
104 | ALLOC_STATUS_URB = (1 << 0), |
105 | SUBMIT_STATUS_URB = (1 << 1), | |
115bb1ff MW |
106 | ALLOC_DATA_IN_URB = (1 << 2), |
107 | SUBMIT_DATA_IN_URB = (1 << 3), | |
108 | ALLOC_DATA_OUT_URB = (1 << 4), | |
109 | SUBMIT_DATA_OUT_URB = (1 << 5), | |
110 | ALLOC_CMD_URB = (1 << 6), | |
111 | SUBMIT_CMD_URB = (1 << 7), | |
112 | }; | |
113 | ||
114 | /* Overrides scsi_pointer */ | |
115 | struct uas_cmd_info { | |
116 | unsigned int state; | |
117 | unsigned int stream; | |
118 | struct urb *cmd_urb; | |
92a3f767 | 119 | struct urb *status_urb; |
115bb1ff MW |
120 | struct urb *data_in_urb; |
121 | struct urb *data_out_urb; | |
122 | struct list_head list; | |
123 | }; | |
124 | ||
125 | /* I hate forward declarations, but I actually have a loop */ | |
126 | static int uas_submit_urbs(struct scsi_cmnd *cmnd, | |
127 | struct uas_dev_info *devinfo, gfp_t gfp); | |
128 | ||
129 | static DEFINE_SPINLOCK(uas_work_lock); | |
130 | static LIST_HEAD(uas_work_list); | |
131 | ||
132 | static void uas_do_work(struct work_struct *work) | |
133 | { | |
134 | struct uas_cmd_info *cmdinfo; | |
135 | struct list_head list; | |
136 | ||
137 | spin_lock_irq(&uas_work_lock); | |
138 | list_replace_init(&uas_work_list, &list); | |
139 | spin_unlock_irq(&uas_work_lock); | |
140 | ||
141 | list_for_each_entry(cmdinfo, &list, list) { | |
142 | struct scsi_pointer *scp = (void *)cmdinfo; | |
143 | struct scsi_cmnd *cmnd = container_of(scp, | |
144 | struct scsi_cmnd, SCp); | |
0b83ae96 | 145 | uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_NOIO); |
115bb1ff MW |
146 | } |
147 | } | |
148 | ||
149 | static DECLARE_WORK(uas_work, uas_do_work); | |
150 | ||
151 | static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd) | |
152 | { | |
153 | struct sense_iu *sense_iu = urb->transfer_buffer; | |
154 | struct scsi_device *sdev = cmnd->device; | |
155 | ||
156 | if (urb->actual_length > 16) { | |
157 | unsigned len = be16_to_cpup(&sense_iu->len); | |
158 | if (len + 16 != urb->actual_length) { | |
159 | int newlen = min(len + 16, urb->actual_length) - 16; | |
160 | if (newlen < 0) | |
161 | newlen = 0; | |
162 | sdev_printk(KERN_INFO, sdev, "%s: urb length %d " | |
163 | "disagrees with IU sense data length %d, " | |
164 | "using %d bytes of sense data\n", __func__, | |
165 | urb->actual_length, len, newlen); | |
166 | len = newlen; | |
167 | } | |
168 | memcpy(cmnd->sense_buffer, sense_iu->sense, len); | |
169 | } | |
170 | ||
171 | cmnd->result = sense_iu->status; | |
172 | if (sdev->current_cmnd) | |
173 | sdev->current_cmnd = NULL; | |
174 | cmnd->scsi_done(cmnd); | |
175 | usb_free_urb(urb); | |
176 | } | |
177 | ||
178 | static void uas_sense_old(struct urb *urb, struct scsi_cmnd *cmnd) | |
179 | { | |
180 | struct sense_iu_old *sense_iu = urb->transfer_buffer; | |
181 | struct scsi_device *sdev = cmnd->device; | |
182 | ||
183 | if (urb->actual_length > 8) { | |
184 | unsigned len = be16_to_cpup(&sense_iu->len) - 2; | |
185 | if (len + 8 != urb->actual_length) { | |
186 | int newlen = min(len + 8, urb->actual_length) - 8; | |
187 | if (newlen < 0) | |
188 | newlen = 0; | |
189 | sdev_printk(KERN_INFO, sdev, "%s: urb length %d " | |
190 | "disagrees with IU sense data length %d, " | |
191 | "using %d bytes of sense data\n", __func__, | |
192 | urb->actual_length, len, newlen); | |
193 | len = newlen; | |
194 | } | |
195 | memcpy(cmnd->sense_buffer, sense_iu->sense, len); | |
196 | } | |
197 | ||
198 | cmnd->result = sense_iu->status; | |
199 | if (sdev->current_cmnd) | |
200 | sdev->current_cmnd = NULL; | |
201 | cmnd->scsi_done(cmnd); | |
202 | usb_free_urb(urb); | |
203 | } | |
204 | ||
205 | static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd, | |
206 | unsigned direction) | |
207 | { | |
208 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
209 | int err; | |
210 | ||
92a3f767 | 211 | cmdinfo->state = direction | SUBMIT_STATUS_URB; |
115bb1ff MW |
212 | err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC); |
213 | if (err) { | |
214 | spin_lock(&uas_work_lock); | |
215 | list_add_tail(&cmdinfo->list, &uas_work_list); | |
216 | spin_unlock(&uas_work_lock); | |
217 | schedule_work(&uas_work); | |
218 | } | |
219 | } | |
220 | ||
221 | static void uas_stat_cmplt(struct urb *urb) | |
222 | { | |
223 | struct iu *iu = urb->transfer_buffer; | |
224 | struct scsi_device *sdev = urb->context; | |
225 | struct uas_dev_info *devinfo = sdev->hostdata; | |
226 | struct scsi_cmnd *cmnd; | |
227 | u16 tag; | |
228 | ||
229 | if (urb->status) { | |
230 | dev_err(&urb->dev->dev, "URB BAD STATUS %d\n", urb->status); | |
231 | usb_free_urb(urb); | |
232 | return; | |
233 | } | |
234 | ||
235 | tag = be16_to_cpup(&iu->tag) - 1; | |
236 | if (sdev->current_cmnd) | |
237 | cmnd = sdev->current_cmnd; | |
238 | else | |
239 | cmnd = scsi_find_tag(sdev, tag); | |
240 | if (!cmnd) | |
241 | return; | |
242 | ||
243 | switch (iu->iu_id) { | |
244 | case IU_ID_STATUS: | |
245 | if (urb->actual_length < 16) | |
246 | devinfo->uas_sense_old = 1; | |
247 | if (devinfo->uas_sense_old) | |
248 | uas_sense_old(urb, cmnd); | |
249 | else | |
250 | uas_sense(urb, cmnd); | |
251 | break; | |
252 | case IU_ID_READ_READY: | |
253 | uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB); | |
254 | break; | |
255 | case IU_ID_WRITE_READY: | |
256 | uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB); | |
257 | break; | |
258 | default: | |
259 | scmd_printk(KERN_ERR, cmnd, | |
260 | "Bogus IU (%d) received on status pipe\n", iu->iu_id); | |
261 | } | |
262 | } | |
263 | ||
264 | static void uas_data_cmplt(struct urb *urb) | |
265 | { | |
266 | struct scsi_data_buffer *sdb = urb->context; | |
267 | sdb->resid = sdb->length - urb->actual_length; | |
268 | usb_free_urb(urb); | |
269 | } | |
270 | ||
271 | static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp, | |
272 | unsigned int pipe, u16 stream_id, | |
273 | struct scsi_data_buffer *sdb, | |
274 | enum dma_data_direction dir) | |
275 | { | |
276 | struct usb_device *udev = devinfo->udev; | |
277 | struct urb *urb = usb_alloc_urb(0, gfp); | |
278 | ||
279 | if (!urb) | |
280 | goto out; | |
281 | usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length, uas_data_cmplt, | |
282 | sdb); | |
283 | if (devinfo->use_streams) | |
284 | urb->stream_id = stream_id; | |
285 | urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0; | |
286 | urb->sg = sdb->table.sgl; | |
287 | out: | |
288 | return urb; | |
289 | } | |
290 | ||
291 | static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp, | |
292 | struct scsi_cmnd *cmnd, u16 stream_id) | |
293 | { | |
294 | struct usb_device *udev = devinfo->udev; | |
295 | struct urb *urb = usb_alloc_urb(0, gfp); | |
296 | struct sense_iu *iu; | |
297 | ||
298 | if (!urb) | |
299 | goto out; | |
300 | ||
ac563cfd | 301 | iu = kzalloc(sizeof(*iu), gfp); |
115bb1ff MW |
302 | if (!iu) |
303 | goto free; | |
304 | ||
305 | usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu), | |
306 | uas_stat_cmplt, cmnd->device); | |
307 | urb->stream_id = stream_id; | |
308 | urb->transfer_flags |= URB_FREE_BUFFER; | |
309 | out: | |
310 | return urb; | |
311 | free: | |
312 | usb_free_urb(urb); | |
313 | return NULL; | |
314 | } | |
315 | ||
316 | static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp, | |
317 | struct scsi_cmnd *cmnd, u16 stream_id) | |
318 | { | |
319 | struct usb_device *udev = devinfo->udev; | |
320 | struct scsi_device *sdev = cmnd->device; | |
321 | struct urb *urb = usb_alloc_urb(0, gfp); | |
322 | struct command_iu *iu; | |
323 | int len; | |
324 | ||
325 | if (!urb) | |
326 | goto out; | |
327 | ||
328 | len = cmnd->cmd_len - 16; | |
329 | if (len < 0) | |
330 | len = 0; | |
331 | len = ALIGN(len, 4); | |
ac563cfd | 332 | iu = kzalloc(sizeof(*iu) + len, gfp); |
115bb1ff MW |
333 | if (!iu) |
334 | goto free; | |
335 | ||
336 | iu->iu_id = IU_ID_COMMAND; | |
337 | iu->tag = cpu_to_be16(stream_id); | |
02e031cb | 338 | iu->prio_attr = UAS_SIMPLE_TAG; |
115bb1ff MW |
339 | iu->len = len; |
340 | int_to_scsilun(sdev->lun, &iu->lun); | |
341 | memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len); | |
342 | ||
343 | usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len, | |
344 | usb_free_urb, NULL); | |
345 | urb->transfer_flags |= URB_FREE_BUFFER; | |
346 | out: | |
347 | return urb; | |
348 | free: | |
349 | usb_free_urb(urb); | |
350 | return NULL; | |
351 | } | |
352 | ||
353 | /* | |
354 | * Why should I request the Status IU before sending the Command IU? Spec | |
355 | * says to, but also says the device may receive them in any order. Seems | |
356 | * daft to me. | |
357 | */ | |
358 | ||
359 | static int uas_submit_urbs(struct scsi_cmnd *cmnd, | |
360 | struct uas_dev_info *devinfo, gfp_t gfp) | |
361 | { | |
362 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
363 | ||
92a3f767 MW |
364 | if (cmdinfo->state & ALLOC_STATUS_URB) { |
365 | cmdinfo->status_urb = uas_alloc_sense_urb(devinfo, gfp, cmnd, | |
366 | cmdinfo->stream); | |
367 | if (!cmdinfo->status_urb) | |
115bb1ff | 368 | return SCSI_MLQUEUE_DEVICE_BUSY; |
92a3f767 | 369 | cmdinfo->state &= ~ALLOC_STATUS_URB; |
115bb1ff MW |
370 | } |
371 | ||
92a3f767 MW |
372 | if (cmdinfo->state & SUBMIT_STATUS_URB) { |
373 | if (usb_submit_urb(cmdinfo->status_urb, gfp)) { | |
115bb1ff MW |
374 | scmd_printk(KERN_INFO, cmnd, |
375 | "sense urb submission failure\n"); | |
376 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
377 | } | |
92a3f767 | 378 | cmdinfo->state &= ~SUBMIT_STATUS_URB; |
115bb1ff MW |
379 | } |
380 | ||
381 | if (cmdinfo->state & ALLOC_DATA_IN_URB) { | |
382 | cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, gfp, | |
383 | devinfo->data_in_pipe, cmdinfo->stream, | |
384 | scsi_in(cmnd), DMA_FROM_DEVICE); | |
385 | if (!cmdinfo->data_in_urb) | |
386 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
387 | cmdinfo->state &= ~ALLOC_DATA_IN_URB; | |
388 | } | |
389 | ||
390 | if (cmdinfo->state & SUBMIT_DATA_IN_URB) { | |
391 | if (usb_submit_urb(cmdinfo->data_in_urb, gfp)) { | |
392 | scmd_printk(KERN_INFO, cmnd, | |
393 | "data in urb submission failure\n"); | |
394 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
395 | } | |
396 | cmdinfo->state &= ~SUBMIT_DATA_IN_URB; | |
397 | } | |
398 | ||
399 | if (cmdinfo->state & ALLOC_DATA_OUT_URB) { | |
400 | cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, gfp, | |
401 | devinfo->data_out_pipe, cmdinfo->stream, | |
402 | scsi_out(cmnd), DMA_TO_DEVICE); | |
403 | if (!cmdinfo->data_out_urb) | |
404 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
405 | cmdinfo->state &= ~ALLOC_DATA_OUT_URB; | |
406 | } | |
407 | ||
408 | if (cmdinfo->state & SUBMIT_DATA_OUT_URB) { | |
409 | if (usb_submit_urb(cmdinfo->data_out_urb, gfp)) { | |
410 | scmd_printk(KERN_INFO, cmnd, | |
411 | "data out urb submission failure\n"); | |
412 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
413 | } | |
414 | cmdinfo->state &= ~SUBMIT_DATA_OUT_URB; | |
415 | } | |
416 | ||
417 | if (cmdinfo->state & ALLOC_CMD_URB) { | |
418 | cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, gfp, cmnd, | |
419 | cmdinfo->stream); | |
420 | if (!cmdinfo->cmd_urb) | |
421 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
422 | cmdinfo->state &= ~ALLOC_CMD_URB; | |
423 | } | |
424 | ||
425 | if (cmdinfo->state & SUBMIT_CMD_URB) { | |
426 | if (usb_submit_urb(cmdinfo->cmd_urb, gfp)) { | |
427 | scmd_printk(KERN_INFO, cmnd, | |
428 | "cmd urb submission failure\n"); | |
429 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
430 | } | |
431 | cmdinfo->state &= ~SUBMIT_CMD_URB; | |
432 | } | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
f281233d | 437 | static int uas_queuecommand_lck(struct scsi_cmnd *cmnd, |
115bb1ff MW |
438 | void (*done)(struct scsi_cmnd *)) |
439 | { | |
440 | struct scsi_device *sdev = cmnd->device; | |
441 | struct uas_dev_info *devinfo = sdev->hostdata; | |
442 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
443 | int err; | |
444 | ||
445 | BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer)); | |
446 | ||
92a3f767 | 447 | if (!cmdinfo->status_urb && sdev->current_cmnd) |
115bb1ff MW |
448 | return SCSI_MLQUEUE_DEVICE_BUSY; |
449 | ||
450 | if (blk_rq_tagged(cmnd->request)) { | |
451 | cmdinfo->stream = cmnd->request->tag + 1; | |
452 | } else { | |
453 | sdev->current_cmnd = cmnd; | |
454 | cmdinfo->stream = 1; | |
455 | } | |
456 | ||
457 | cmnd->scsi_done = done; | |
458 | ||
92a3f767 | 459 | cmdinfo->state = ALLOC_STATUS_URB | SUBMIT_STATUS_URB | |
115bb1ff MW |
460 | ALLOC_CMD_URB | SUBMIT_CMD_URB; |
461 | ||
462 | switch (cmnd->sc_data_direction) { | |
463 | case DMA_FROM_DEVICE: | |
464 | cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB; | |
465 | break; | |
466 | case DMA_BIDIRECTIONAL: | |
467 | cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB; | |
468 | case DMA_TO_DEVICE: | |
469 | cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB; | |
470 | case DMA_NONE: | |
471 | break; | |
472 | } | |
473 | ||
474 | if (!devinfo->use_streams) { | |
475 | cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB); | |
476 | cmdinfo->stream = 0; | |
477 | } | |
478 | ||
479 | err = uas_submit_urbs(cmnd, devinfo, GFP_ATOMIC); | |
480 | if (err) { | |
481 | /* If we did nothing, give up now */ | |
92a3f767 MW |
482 | if (cmdinfo->state & SUBMIT_STATUS_URB) { |
483 | usb_free_urb(cmdinfo->status_urb); | |
115bb1ff MW |
484 | return SCSI_MLQUEUE_DEVICE_BUSY; |
485 | } | |
486 | spin_lock(&uas_work_lock); | |
487 | list_add_tail(&cmdinfo->list, &uas_work_list); | |
488 | spin_unlock(&uas_work_lock); | |
489 | schedule_work(&uas_work); | |
490 | } | |
491 | ||
492 | return 0; | |
493 | } | |
494 | ||
f281233d JG |
495 | static DEF_SCSI_QCMD(uas_queuecommand) |
496 | ||
115bb1ff MW |
497 | static int uas_eh_abort_handler(struct scsi_cmnd *cmnd) |
498 | { | |
499 | struct scsi_device *sdev = cmnd->device; | |
500 | sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__, | |
501 | cmnd->request->tag); | |
502 | ||
503 | /* XXX: Send ABORT TASK Task Management command */ | |
504 | return FAILED; | |
505 | } | |
506 | ||
507 | static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd) | |
508 | { | |
509 | struct scsi_device *sdev = cmnd->device; | |
510 | sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__, | |
511 | cmnd->request->tag); | |
512 | ||
513 | /* XXX: Send LOGICAL UNIT RESET Task Management command */ | |
514 | return FAILED; | |
515 | } | |
516 | ||
517 | static int uas_eh_target_reset_handler(struct scsi_cmnd *cmnd) | |
518 | { | |
519 | struct scsi_device *sdev = cmnd->device; | |
520 | sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__, | |
521 | cmnd->request->tag); | |
522 | ||
523 | /* XXX: Can we reset just the one USB interface? | |
524 | * Would calling usb_set_interface() have the right effect? | |
525 | */ | |
526 | return FAILED; | |
527 | } | |
528 | ||
529 | static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd) | |
530 | { | |
531 | struct scsi_device *sdev = cmnd->device; | |
532 | struct uas_dev_info *devinfo = sdev->hostdata; | |
533 | struct usb_device *udev = devinfo->udev; | |
534 | ||
535 | sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__, | |
536 | cmnd->request->tag); | |
537 | ||
538 | if (usb_reset_device(udev)) | |
539 | return SUCCESS; | |
540 | ||
541 | return FAILED; | |
542 | } | |
543 | ||
544 | static int uas_slave_alloc(struct scsi_device *sdev) | |
545 | { | |
546 | sdev->hostdata = (void *)sdev->host->hostdata[0]; | |
547 | return 0; | |
548 | } | |
549 | ||
550 | static int uas_slave_configure(struct scsi_device *sdev) | |
551 | { | |
552 | struct uas_dev_info *devinfo = sdev->hostdata; | |
553 | scsi_set_tag_type(sdev, MSG_ORDERED_TAG); | |
554 | scsi_activate_tcq(sdev, devinfo->qdepth - 1); | |
555 | return 0; | |
556 | } | |
557 | ||
558 | static struct scsi_host_template uas_host_template = { | |
559 | .module = THIS_MODULE, | |
560 | .name = "uas", | |
561 | .queuecommand = uas_queuecommand, | |
562 | .slave_alloc = uas_slave_alloc, | |
563 | .slave_configure = uas_slave_configure, | |
564 | .eh_abort_handler = uas_eh_abort_handler, | |
565 | .eh_device_reset_handler = uas_eh_device_reset_handler, | |
566 | .eh_target_reset_handler = uas_eh_target_reset_handler, | |
567 | .eh_bus_reset_handler = uas_eh_bus_reset_handler, | |
568 | .can_queue = 65536, /* Is there a limit on the _host_ ? */ | |
569 | .this_id = -1, | |
570 | .sg_tablesize = SG_NONE, | |
571 | .cmd_per_lun = 1, /* until we override it */ | |
572 | .skip_settle_delay = 1, | |
573 | .ordered_tag = 1, | |
574 | }; | |
575 | ||
576 | static struct usb_device_id uas_usb_ids[] = { | |
577 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) }, | |
578 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) }, | |
579 | /* 0xaa is a prototype device I happen to have access to */ | |
580 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, 0xaa) }, | |
581 | { } | |
582 | }; | |
583 | MODULE_DEVICE_TABLE(usb, uas_usb_ids); | |
584 | ||
89dc2905 MW |
585 | static int uas_is_interface(struct usb_host_interface *intf) |
586 | { | |
587 | return (intf->desc.bInterfaceClass == USB_CLASS_MASS_STORAGE && | |
588 | intf->desc.bInterfaceSubClass == USB_SC_SCSI && | |
589 | intf->desc.bInterfaceProtocol == USB_PR_UAS); | |
590 | } | |
591 | ||
592 | static int uas_switch_interface(struct usb_device *udev, | |
593 | struct usb_interface *intf) | |
594 | { | |
595 | int i; | |
596 | ||
597 | if (uas_is_interface(intf->cur_altsetting)) | |
598 | return 0; | |
599 | ||
600 | for (i = 0; i < intf->num_altsetting; i++) { | |
601 | struct usb_host_interface *alt = &intf->altsetting[i]; | |
602 | if (alt == intf->cur_altsetting) | |
603 | continue; | |
604 | if (uas_is_interface(alt)) | |
605 | return usb_set_interface(udev, | |
606 | alt->desc.bInterfaceNumber, | |
607 | alt->desc.bAlternateSetting); | |
608 | } | |
609 | ||
610 | return -ENODEV; | |
611 | } | |
612 | ||
115bb1ff MW |
613 | static void uas_configure_endpoints(struct uas_dev_info *devinfo) |
614 | { | |
615 | struct usb_host_endpoint *eps[4] = { }; | |
616 | struct usb_interface *intf = devinfo->intf; | |
617 | struct usb_device *udev = devinfo->udev; | |
618 | struct usb_host_endpoint *endpoint = intf->cur_altsetting->endpoint; | |
619 | unsigned i, n_endpoints = intf->cur_altsetting->desc.bNumEndpoints; | |
620 | ||
621 | devinfo->uas_sense_old = 0; | |
622 | ||
623 | for (i = 0; i < n_endpoints; i++) { | |
624 | unsigned char *extra = endpoint[i].extra; | |
625 | int len = endpoint[i].extralen; | |
626 | while (len > 1) { | |
627 | if (extra[1] == USB_DT_PIPE_USAGE) { | |
628 | unsigned pipe_id = extra[2]; | |
629 | if (pipe_id > 0 && pipe_id < 5) | |
630 | eps[pipe_id - 1] = &endpoint[i]; | |
631 | break; | |
632 | } | |
633 | len -= extra[0]; | |
634 | extra += extra[0]; | |
635 | } | |
636 | } | |
637 | ||
638 | /* | |
639 | * Assume that if we didn't find a control pipe descriptor, we're | |
640 | * using a device with old firmware that happens to be set up like | |
641 | * this. | |
642 | */ | |
643 | if (!eps[0]) { | |
644 | devinfo->cmd_pipe = usb_sndbulkpipe(udev, 1); | |
645 | devinfo->status_pipe = usb_rcvbulkpipe(udev, 1); | |
646 | devinfo->data_in_pipe = usb_rcvbulkpipe(udev, 2); | |
647 | devinfo->data_out_pipe = usb_sndbulkpipe(udev, 2); | |
648 | ||
649 | eps[1] = usb_pipe_endpoint(udev, devinfo->status_pipe); | |
650 | eps[2] = usb_pipe_endpoint(udev, devinfo->data_in_pipe); | |
651 | eps[3] = usb_pipe_endpoint(udev, devinfo->data_out_pipe); | |
652 | } else { | |
653 | devinfo->cmd_pipe = usb_sndbulkpipe(udev, | |
654 | eps[0]->desc.bEndpointAddress); | |
655 | devinfo->status_pipe = usb_rcvbulkpipe(udev, | |
656 | eps[1]->desc.bEndpointAddress); | |
657 | devinfo->data_in_pipe = usb_rcvbulkpipe(udev, | |
658 | eps[2]->desc.bEndpointAddress); | |
659 | devinfo->data_out_pipe = usb_sndbulkpipe(udev, | |
660 | eps[3]->desc.bEndpointAddress); | |
661 | } | |
662 | ||
663 | devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1, 3, 256, | |
664 | GFP_KERNEL); | |
665 | if (devinfo->qdepth < 0) { | |
666 | devinfo->qdepth = 256; | |
667 | devinfo->use_streams = 0; | |
668 | } else { | |
669 | devinfo->use_streams = 1; | |
670 | } | |
671 | } | |
672 | ||
673 | /* | |
674 | * XXX: What I'd like to do here is register a SCSI host for each USB host in | |
675 | * the system. Follow usb-storage's design of registering a SCSI host for | |
676 | * each USB device for the moment. Can implement this by walking up the | |
677 | * USB hierarchy until we find a USB host. | |
678 | */ | |
679 | static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
680 | { | |
681 | int result; | |
682 | struct Scsi_Host *shost; | |
683 | struct uas_dev_info *devinfo; | |
684 | struct usb_device *udev = interface_to_usbdev(intf); | |
685 | ||
89dc2905 MW |
686 | if (uas_switch_interface(udev, intf)) |
687 | return -ENODEV; | |
115bb1ff MW |
688 | |
689 | devinfo = kmalloc(sizeof(struct uas_dev_info), GFP_KERNEL); | |
690 | if (!devinfo) | |
691 | return -ENOMEM; | |
692 | ||
693 | result = -ENOMEM; | |
694 | shost = scsi_host_alloc(&uas_host_template, sizeof(void *)); | |
695 | if (!shost) | |
696 | goto free; | |
697 | ||
698 | shost->max_cmd_len = 16 + 252; | |
699 | shost->max_id = 1; | |
700 | shost->sg_tablesize = udev->bus->sg_tablesize; | |
701 | ||
702 | result = scsi_add_host(shost, &intf->dev); | |
703 | if (result) | |
704 | goto free; | |
705 | shost->hostdata[0] = (unsigned long)devinfo; | |
706 | ||
707 | devinfo->intf = intf; | |
708 | devinfo->udev = udev; | |
709 | uas_configure_endpoints(devinfo); | |
710 | ||
711 | scsi_scan_host(shost); | |
712 | usb_set_intfdata(intf, shost); | |
713 | return result; | |
714 | free: | |
715 | kfree(devinfo); | |
716 | if (shost) | |
717 | scsi_host_put(shost); | |
718 | return result; | |
719 | } | |
720 | ||
721 | static int uas_pre_reset(struct usb_interface *intf) | |
722 | { | |
723 | /* XXX: Need to return 1 if it's not our device in error handling */ | |
724 | return 0; | |
725 | } | |
726 | ||
727 | static int uas_post_reset(struct usb_interface *intf) | |
728 | { | |
729 | /* XXX: Need to return 1 if it's not our device in error handling */ | |
730 | return 0; | |
731 | } | |
732 | ||
733 | static void uas_disconnect(struct usb_interface *intf) | |
734 | { | |
735 | struct usb_device *udev = interface_to_usbdev(intf); | |
736 | struct usb_host_endpoint *eps[3]; | |
737 | struct Scsi_Host *shost = usb_get_intfdata(intf); | |
738 | struct uas_dev_info *devinfo = (void *)shost->hostdata[0]; | |
739 | ||
740 | scsi_remove_host(shost); | |
741 | ||
742 | eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe); | |
743 | eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe); | |
744 | eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe); | |
745 | usb_free_streams(intf, eps, 3, GFP_KERNEL); | |
746 | ||
747 | kfree(devinfo); | |
748 | } | |
749 | ||
750 | /* | |
751 | * XXX: Should this plug into libusual so we can auto-upgrade devices from | |
752 | * Bulk-Only to UAS? | |
753 | */ | |
754 | static struct usb_driver uas_driver = { | |
755 | .name = "uas", | |
756 | .probe = uas_probe, | |
757 | .disconnect = uas_disconnect, | |
758 | .pre_reset = uas_pre_reset, | |
759 | .post_reset = uas_post_reset, | |
760 | .id_table = uas_usb_ids, | |
761 | }; | |
762 | ||
763 | static int uas_init(void) | |
764 | { | |
765 | return usb_register(&uas_driver); | |
766 | } | |
767 | ||
768 | static void uas_exit(void) | |
769 | { | |
770 | usb_deregister(&uas_driver); | |
771 | } | |
772 | ||
773 | module_init(uas_init); | |
774 | module_exit(uas_exit); | |
775 | ||
776 | MODULE_LICENSE("GPL"); | |
777 | MODULE_AUTHOR("Matthew Wilcox and Sarah Sharp"); |