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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> | |
14 | #include <linux/usb.h> | |
15 | #include <linux/usb/storage.h> | |
16 | ||
17 | #include <scsi/scsi.h> | |
18 | #include <scsi/scsi_dbg.h> | |
19 | #include <scsi/scsi_cmnd.h> | |
20 | #include <scsi/scsi_device.h> | |
21 | #include <scsi/scsi_host.h> | |
22 | #include <scsi/scsi_tcq.h> | |
23 | ||
24 | /* Common header for all IUs */ | |
25 | struct iu { | |
26 | __u8 iu_id; | |
27 | __u8 rsvd1; | |
28 | __be16 tag; | |
29 | }; | |
30 | ||
31 | enum { | |
32 | IU_ID_COMMAND = 0x01, | |
33 | IU_ID_STATUS = 0x03, | |
34 | IU_ID_RESPONSE = 0x04, | |
35 | IU_ID_TASK_MGMT = 0x05, | |
36 | IU_ID_READ_READY = 0x06, | |
37 | IU_ID_WRITE_READY = 0x07, | |
38 | }; | |
39 | ||
40 | struct command_iu { | |
41 | __u8 iu_id; | |
42 | __u8 rsvd1; | |
43 | __be16 tag; | |
44 | __u8 prio_attr; | |
45 | __u8 rsvd5; | |
46 | __u8 len; | |
47 | __u8 rsvd7; | |
48 | struct scsi_lun lun; | |
49 | __u8 cdb[16]; /* XXX: Overflow-checking tools may misunderstand */ | |
50 | }; | |
51 | ||
52 | struct sense_iu { | |
53 | __u8 iu_id; | |
54 | __u8 rsvd1; | |
55 | __be16 tag; | |
56 | __be16 status_qual; | |
57 | __u8 status; | |
58 | __u8 service_response; | |
59 | __u8 rsvd8[6]; | |
60 | __be16 len; | |
61 | __u8 sense[SCSI_SENSE_BUFFERSIZE]; | |
62 | }; | |
63 | ||
64 | /* | |
65 | * The r00-r01c specs define this version of the SENSE IU data structure. | |
66 | * It's still in use by several different firmware releases. | |
67 | */ | |
68 | struct sense_iu_old { | |
69 | __u8 iu_id; | |
70 | __u8 rsvd1; | |
71 | __be16 tag; | |
72 | __be16 len; | |
73 | __u8 status; | |
74 | __u8 service_response; | |
75 | __u8 sense[SCSI_SENSE_BUFFERSIZE]; | |
76 | }; | |
77 | ||
78 | enum { | |
79 | CMD_PIPE_ID = 1, | |
80 | STATUS_PIPE_ID = 2, | |
81 | DATA_IN_PIPE_ID = 3, | |
82 | DATA_OUT_PIPE_ID = 4, | |
83 | ||
84 | UAS_SIMPLE_TAG = 0, | |
85 | UAS_HEAD_TAG = 1, | |
86 | UAS_ORDERED_TAG = 2, | |
87 | UAS_ACA = 4, | |
88 | }; | |
89 | ||
90 | struct uas_dev_info { | |
91 | struct usb_interface *intf; | |
92 | struct usb_device *udev; | |
93 | int qdepth; | |
94 | unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe; | |
95 | unsigned use_streams:1; | |
96 | unsigned uas_sense_old:1; | |
97 | }; | |
98 | ||
99 | enum { | |
100 | ALLOC_SENSE_URB = (1 << 0), | |
101 | SUBMIT_SENSE_URB = (1 << 1), | |
102 | ALLOC_DATA_IN_URB = (1 << 2), | |
103 | SUBMIT_DATA_IN_URB = (1 << 3), | |
104 | ALLOC_DATA_OUT_URB = (1 << 4), | |
105 | SUBMIT_DATA_OUT_URB = (1 << 5), | |
106 | ALLOC_CMD_URB = (1 << 6), | |
107 | SUBMIT_CMD_URB = (1 << 7), | |
108 | }; | |
109 | ||
110 | /* Overrides scsi_pointer */ | |
111 | struct uas_cmd_info { | |
112 | unsigned int state; | |
113 | unsigned int stream; | |
114 | struct urb *cmd_urb; | |
115 | struct urb *sense_urb; | |
116 | struct urb *data_in_urb; | |
117 | struct urb *data_out_urb; | |
118 | struct list_head list; | |
119 | }; | |
120 | ||
121 | /* I hate forward declarations, but I actually have a loop */ | |
122 | static int uas_submit_urbs(struct scsi_cmnd *cmnd, | |
123 | struct uas_dev_info *devinfo, gfp_t gfp); | |
124 | ||
125 | static DEFINE_SPINLOCK(uas_work_lock); | |
126 | static LIST_HEAD(uas_work_list); | |
127 | ||
128 | static void uas_do_work(struct work_struct *work) | |
129 | { | |
130 | struct uas_cmd_info *cmdinfo; | |
131 | struct list_head list; | |
132 | ||
133 | spin_lock_irq(&uas_work_lock); | |
134 | list_replace_init(&uas_work_list, &list); | |
135 | spin_unlock_irq(&uas_work_lock); | |
136 | ||
137 | list_for_each_entry(cmdinfo, &list, list) { | |
138 | struct scsi_pointer *scp = (void *)cmdinfo; | |
139 | struct scsi_cmnd *cmnd = container_of(scp, | |
140 | struct scsi_cmnd, SCp); | |
141 | uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_KERNEL); | |
142 | } | |
143 | } | |
144 | ||
145 | static DECLARE_WORK(uas_work, uas_do_work); | |
146 | ||
147 | static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd) | |
148 | { | |
149 | struct sense_iu *sense_iu = urb->transfer_buffer; | |
150 | struct scsi_device *sdev = cmnd->device; | |
151 | ||
152 | if (urb->actual_length > 16) { | |
153 | unsigned len = be16_to_cpup(&sense_iu->len); | |
154 | if (len + 16 != urb->actual_length) { | |
155 | int newlen = min(len + 16, urb->actual_length) - 16; | |
156 | if (newlen < 0) | |
157 | newlen = 0; | |
158 | sdev_printk(KERN_INFO, sdev, "%s: urb length %d " | |
159 | "disagrees with IU sense data length %d, " | |
160 | "using %d bytes of sense data\n", __func__, | |
161 | urb->actual_length, len, newlen); | |
162 | len = newlen; | |
163 | } | |
164 | memcpy(cmnd->sense_buffer, sense_iu->sense, len); | |
165 | } | |
166 | ||
167 | cmnd->result = sense_iu->status; | |
168 | if (sdev->current_cmnd) | |
169 | sdev->current_cmnd = NULL; | |
170 | cmnd->scsi_done(cmnd); | |
171 | usb_free_urb(urb); | |
172 | } | |
173 | ||
174 | static void uas_sense_old(struct urb *urb, struct scsi_cmnd *cmnd) | |
175 | { | |
176 | struct sense_iu_old *sense_iu = urb->transfer_buffer; | |
177 | struct scsi_device *sdev = cmnd->device; | |
178 | ||
179 | if (urb->actual_length > 8) { | |
180 | unsigned len = be16_to_cpup(&sense_iu->len) - 2; | |
181 | if (len + 8 != urb->actual_length) { | |
182 | int newlen = min(len + 8, urb->actual_length) - 8; | |
183 | if (newlen < 0) | |
184 | newlen = 0; | |
185 | sdev_printk(KERN_INFO, sdev, "%s: urb length %d " | |
186 | "disagrees with IU sense data length %d, " | |
187 | "using %d bytes of sense data\n", __func__, | |
188 | urb->actual_length, len, newlen); | |
189 | len = newlen; | |
190 | } | |
191 | memcpy(cmnd->sense_buffer, sense_iu->sense, len); | |
192 | } | |
193 | ||
194 | cmnd->result = sense_iu->status; | |
195 | if (sdev->current_cmnd) | |
196 | sdev->current_cmnd = NULL; | |
197 | cmnd->scsi_done(cmnd); | |
198 | usb_free_urb(urb); | |
199 | } | |
200 | ||
201 | static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd, | |
202 | unsigned direction) | |
203 | { | |
204 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
205 | int err; | |
206 | ||
207 | cmdinfo->state = direction | SUBMIT_SENSE_URB; | |
208 | err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC); | |
209 | if (err) { | |
210 | spin_lock(&uas_work_lock); | |
211 | list_add_tail(&cmdinfo->list, &uas_work_list); | |
212 | spin_unlock(&uas_work_lock); | |
213 | schedule_work(&uas_work); | |
214 | } | |
215 | } | |
216 | ||
217 | static void uas_stat_cmplt(struct urb *urb) | |
218 | { | |
219 | struct iu *iu = urb->transfer_buffer; | |
220 | struct scsi_device *sdev = urb->context; | |
221 | struct uas_dev_info *devinfo = sdev->hostdata; | |
222 | struct scsi_cmnd *cmnd; | |
223 | u16 tag; | |
224 | ||
225 | if (urb->status) { | |
226 | dev_err(&urb->dev->dev, "URB BAD STATUS %d\n", urb->status); | |
227 | usb_free_urb(urb); | |
228 | return; | |
229 | } | |
230 | ||
231 | tag = be16_to_cpup(&iu->tag) - 1; | |
232 | if (sdev->current_cmnd) | |
233 | cmnd = sdev->current_cmnd; | |
234 | else | |
235 | cmnd = scsi_find_tag(sdev, tag); | |
236 | if (!cmnd) | |
237 | return; | |
238 | ||
239 | switch (iu->iu_id) { | |
240 | case IU_ID_STATUS: | |
241 | if (urb->actual_length < 16) | |
242 | devinfo->uas_sense_old = 1; | |
243 | if (devinfo->uas_sense_old) | |
244 | uas_sense_old(urb, cmnd); | |
245 | else | |
246 | uas_sense(urb, cmnd); | |
247 | break; | |
248 | case IU_ID_READ_READY: | |
249 | uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB); | |
250 | break; | |
251 | case IU_ID_WRITE_READY: | |
252 | uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB); | |
253 | break; | |
254 | default: | |
255 | scmd_printk(KERN_ERR, cmnd, | |
256 | "Bogus IU (%d) received on status pipe\n", iu->iu_id); | |
257 | } | |
258 | } | |
259 | ||
260 | static void uas_data_cmplt(struct urb *urb) | |
261 | { | |
262 | struct scsi_data_buffer *sdb = urb->context; | |
263 | sdb->resid = sdb->length - urb->actual_length; | |
264 | usb_free_urb(urb); | |
265 | } | |
266 | ||
267 | static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp, | |
268 | unsigned int pipe, u16 stream_id, | |
269 | struct scsi_data_buffer *sdb, | |
270 | enum dma_data_direction dir) | |
271 | { | |
272 | struct usb_device *udev = devinfo->udev; | |
273 | struct urb *urb = usb_alloc_urb(0, gfp); | |
274 | ||
275 | if (!urb) | |
276 | goto out; | |
277 | usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length, uas_data_cmplt, | |
278 | sdb); | |
279 | if (devinfo->use_streams) | |
280 | urb->stream_id = stream_id; | |
281 | urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0; | |
282 | urb->sg = sdb->table.sgl; | |
283 | out: | |
284 | return urb; | |
285 | } | |
286 | ||
287 | static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp, | |
288 | struct scsi_cmnd *cmnd, u16 stream_id) | |
289 | { | |
290 | struct usb_device *udev = devinfo->udev; | |
291 | struct urb *urb = usb_alloc_urb(0, gfp); | |
292 | struct sense_iu *iu; | |
293 | ||
294 | if (!urb) | |
295 | goto out; | |
296 | ||
297 | iu = kmalloc(sizeof(*iu), gfp); | |
298 | if (!iu) | |
299 | goto free; | |
300 | ||
301 | usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu), | |
302 | uas_stat_cmplt, cmnd->device); | |
303 | urb->stream_id = stream_id; | |
304 | urb->transfer_flags |= URB_FREE_BUFFER; | |
305 | out: | |
306 | return urb; | |
307 | free: | |
308 | usb_free_urb(urb); | |
309 | return NULL; | |
310 | } | |
311 | ||
312 | static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp, | |
313 | struct scsi_cmnd *cmnd, u16 stream_id) | |
314 | { | |
315 | struct usb_device *udev = devinfo->udev; | |
316 | struct scsi_device *sdev = cmnd->device; | |
317 | struct urb *urb = usb_alloc_urb(0, gfp); | |
318 | struct command_iu *iu; | |
319 | int len; | |
320 | ||
321 | if (!urb) | |
322 | goto out; | |
323 | ||
324 | len = cmnd->cmd_len - 16; | |
325 | if (len < 0) | |
326 | len = 0; | |
327 | len = ALIGN(len, 4); | |
328 | iu = kmalloc(sizeof(*iu) + len, gfp); | |
329 | if (!iu) | |
330 | goto free; | |
331 | ||
332 | iu->iu_id = IU_ID_COMMAND; | |
333 | iu->tag = cpu_to_be16(stream_id); | |
02e031cb | 334 | iu->prio_attr = UAS_SIMPLE_TAG; |
115bb1ff MW |
335 | iu->len = len; |
336 | int_to_scsilun(sdev->lun, &iu->lun); | |
337 | memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len); | |
338 | ||
339 | usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len, | |
340 | usb_free_urb, NULL); | |
341 | urb->transfer_flags |= URB_FREE_BUFFER; | |
342 | out: | |
343 | return urb; | |
344 | free: | |
345 | usb_free_urb(urb); | |
346 | return NULL; | |
347 | } | |
348 | ||
349 | /* | |
350 | * Why should I request the Status IU before sending the Command IU? Spec | |
351 | * says to, but also says the device may receive them in any order. Seems | |
352 | * daft to me. | |
353 | */ | |
354 | ||
355 | static int uas_submit_urbs(struct scsi_cmnd *cmnd, | |
356 | struct uas_dev_info *devinfo, gfp_t gfp) | |
357 | { | |
358 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
359 | ||
360 | if (cmdinfo->state & ALLOC_SENSE_URB) { | |
361 | cmdinfo->sense_urb = uas_alloc_sense_urb(devinfo, gfp, cmnd, | |
362 | cmdinfo->stream); | |
363 | if (!cmdinfo->sense_urb) | |
364 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
365 | cmdinfo->state &= ~ALLOC_SENSE_URB; | |
366 | } | |
367 | ||
368 | if (cmdinfo->state & SUBMIT_SENSE_URB) { | |
369 | if (usb_submit_urb(cmdinfo->sense_urb, gfp)) { | |
370 | scmd_printk(KERN_INFO, cmnd, | |
371 | "sense urb submission failure\n"); | |
372 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
373 | } | |
374 | cmdinfo->state &= ~SUBMIT_SENSE_URB; | |
375 | } | |
376 | ||
377 | if (cmdinfo->state & ALLOC_DATA_IN_URB) { | |
378 | cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, gfp, | |
379 | devinfo->data_in_pipe, cmdinfo->stream, | |
380 | scsi_in(cmnd), DMA_FROM_DEVICE); | |
381 | if (!cmdinfo->data_in_urb) | |
382 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
383 | cmdinfo->state &= ~ALLOC_DATA_IN_URB; | |
384 | } | |
385 | ||
386 | if (cmdinfo->state & SUBMIT_DATA_IN_URB) { | |
387 | if (usb_submit_urb(cmdinfo->data_in_urb, gfp)) { | |
388 | scmd_printk(KERN_INFO, cmnd, | |
389 | "data in urb submission failure\n"); | |
390 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
391 | } | |
392 | cmdinfo->state &= ~SUBMIT_DATA_IN_URB; | |
393 | } | |
394 | ||
395 | if (cmdinfo->state & ALLOC_DATA_OUT_URB) { | |
396 | cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, gfp, | |
397 | devinfo->data_out_pipe, cmdinfo->stream, | |
398 | scsi_out(cmnd), DMA_TO_DEVICE); | |
399 | if (!cmdinfo->data_out_urb) | |
400 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
401 | cmdinfo->state &= ~ALLOC_DATA_OUT_URB; | |
402 | } | |
403 | ||
404 | if (cmdinfo->state & SUBMIT_DATA_OUT_URB) { | |
405 | if (usb_submit_urb(cmdinfo->data_out_urb, gfp)) { | |
406 | scmd_printk(KERN_INFO, cmnd, | |
407 | "data out urb submission failure\n"); | |
408 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
409 | } | |
410 | cmdinfo->state &= ~SUBMIT_DATA_OUT_URB; | |
411 | } | |
412 | ||
413 | if (cmdinfo->state & ALLOC_CMD_URB) { | |
414 | cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, gfp, cmnd, | |
415 | cmdinfo->stream); | |
416 | if (!cmdinfo->cmd_urb) | |
417 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
418 | cmdinfo->state &= ~ALLOC_CMD_URB; | |
419 | } | |
420 | ||
421 | if (cmdinfo->state & SUBMIT_CMD_URB) { | |
422 | if (usb_submit_urb(cmdinfo->cmd_urb, gfp)) { | |
423 | scmd_printk(KERN_INFO, cmnd, | |
424 | "cmd urb submission failure\n"); | |
425 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
426 | } | |
427 | cmdinfo->state &= ~SUBMIT_CMD_URB; | |
428 | } | |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
f281233d | 433 | static int uas_queuecommand_lck(struct scsi_cmnd *cmnd, |
115bb1ff MW |
434 | void (*done)(struct scsi_cmnd *)) |
435 | { | |
436 | struct scsi_device *sdev = cmnd->device; | |
437 | struct uas_dev_info *devinfo = sdev->hostdata; | |
438 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
439 | int err; | |
440 | ||
441 | BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer)); | |
442 | ||
443 | if (!cmdinfo->sense_urb && sdev->current_cmnd) | |
444 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
445 | ||
446 | if (blk_rq_tagged(cmnd->request)) { | |
447 | cmdinfo->stream = cmnd->request->tag + 1; | |
448 | } else { | |
449 | sdev->current_cmnd = cmnd; | |
450 | cmdinfo->stream = 1; | |
451 | } | |
452 | ||
453 | cmnd->scsi_done = done; | |
454 | ||
455 | cmdinfo->state = ALLOC_SENSE_URB | SUBMIT_SENSE_URB | | |
456 | ALLOC_CMD_URB | SUBMIT_CMD_URB; | |
457 | ||
458 | switch (cmnd->sc_data_direction) { | |
459 | case DMA_FROM_DEVICE: | |
460 | cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB; | |
461 | break; | |
462 | case DMA_BIDIRECTIONAL: | |
463 | cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB; | |
464 | case DMA_TO_DEVICE: | |
465 | cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB; | |
466 | case DMA_NONE: | |
467 | break; | |
468 | } | |
469 | ||
470 | if (!devinfo->use_streams) { | |
471 | cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB); | |
472 | cmdinfo->stream = 0; | |
473 | } | |
474 | ||
475 | err = uas_submit_urbs(cmnd, devinfo, GFP_ATOMIC); | |
476 | if (err) { | |
477 | /* If we did nothing, give up now */ | |
478 | if (cmdinfo->state & SUBMIT_SENSE_URB) { | |
479 | usb_free_urb(cmdinfo->sense_urb); | |
480 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
481 | } | |
482 | spin_lock(&uas_work_lock); | |
483 | list_add_tail(&cmdinfo->list, &uas_work_list); | |
484 | spin_unlock(&uas_work_lock); | |
485 | schedule_work(&uas_work); | |
486 | } | |
487 | ||
488 | return 0; | |
489 | } | |
490 | ||
f281233d JG |
491 | static DEF_SCSI_QCMD(uas_queuecommand) |
492 | ||
115bb1ff MW |
493 | static int uas_eh_abort_handler(struct scsi_cmnd *cmnd) |
494 | { | |
495 | struct scsi_device *sdev = cmnd->device; | |
496 | sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__, | |
497 | cmnd->request->tag); | |
498 | ||
499 | /* XXX: Send ABORT TASK Task Management command */ | |
500 | return FAILED; | |
501 | } | |
502 | ||
503 | static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd) | |
504 | { | |
505 | struct scsi_device *sdev = cmnd->device; | |
506 | sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__, | |
507 | cmnd->request->tag); | |
508 | ||
509 | /* XXX: Send LOGICAL UNIT RESET Task Management command */ | |
510 | return FAILED; | |
511 | } | |
512 | ||
513 | static int uas_eh_target_reset_handler(struct scsi_cmnd *cmnd) | |
514 | { | |
515 | struct scsi_device *sdev = cmnd->device; | |
516 | sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__, | |
517 | cmnd->request->tag); | |
518 | ||
519 | /* XXX: Can we reset just the one USB interface? | |
520 | * Would calling usb_set_interface() have the right effect? | |
521 | */ | |
522 | return FAILED; | |
523 | } | |
524 | ||
525 | static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd) | |
526 | { | |
527 | struct scsi_device *sdev = cmnd->device; | |
528 | struct uas_dev_info *devinfo = sdev->hostdata; | |
529 | struct usb_device *udev = devinfo->udev; | |
530 | ||
531 | sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__, | |
532 | cmnd->request->tag); | |
533 | ||
534 | if (usb_reset_device(udev)) | |
535 | return SUCCESS; | |
536 | ||
537 | return FAILED; | |
538 | } | |
539 | ||
540 | static int uas_slave_alloc(struct scsi_device *sdev) | |
541 | { | |
542 | sdev->hostdata = (void *)sdev->host->hostdata[0]; | |
543 | return 0; | |
544 | } | |
545 | ||
546 | static int uas_slave_configure(struct scsi_device *sdev) | |
547 | { | |
548 | struct uas_dev_info *devinfo = sdev->hostdata; | |
549 | scsi_set_tag_type(sdev, MSG_ORDERED_TAG); | |
550 | scsi_activate_tcq(sdev, devinfo->qdepth - 1); | |
551 | return 0; | |
552 | } | |
553 | ||
554 | static struct scsi_host_template uas_host_template = { | |
555 | .module = THIS_MODULE, | |
556 | .name = "uas", | |
557 | .queuecommand = uas_queuecommand, | |
558 | .slave_alloc = uas_slave_alloc, | |
559 | .slave_configure = uas_slave_configure, | |
560 | .eh_abort_handler = uas_eh_abort_handler, | |
561 | .eh_device_reset_handler = uas_eh_device_reset_handler, | |
562 | .eh_target_reset_handler = uas_eh_target_reset_handler, | |
563 | .eh_bus_reset_handler = uas_eh_bus_reset_handler, | |
564 | .can_queue = 65536, /* Is there a limit on the _host_ ? */ | |
565 | .this_id = -1, | |
566 | .sg_tablesize = SG_NONE, | |
567 | .cmd_per_lun = 1, /* until we override it */ | |
568 | .skip_settle_delay = 1, | |
569 | .ordered_tag = 1, | |
570 | }; | |
571 | ||
572 | static struct usb_device_id uas_usb_ids[] = { | |
573 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) }, | |
574 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) }, | |
575 | /* 0xaa is a prototype device I happen to have access to */ | |
576 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, 0xaa) }, | |
577 | { } | |
578 | }; | |
579 | MODULE_DEVICE_TABLE(usb, uas_usb_ids); | |
580 | ||
581 | static void uas_configure_endpoints(struct uas_dev_info *devinfo) | |
582 | { | |
583 | struct usb_host_endpoint *eps[4] = { }; | |
584 | struct usb_interface *intf = devinfo->intf; | |
585 | struct usb_device *udev = devinfo->udev; | |
586 | struct usb_host_endpoint *endpoint = intf->cur_altsetting->endpoint; | |
587 | unsigned i, n_endpoints = intf->cur_altsetting->desc.bNumEndpoints; | |
588 | ||
589 | devinfo->uas_sense_old = 0; | |
590 | ||
591 | for (i = 0; i < n_endpoints; i++) { | |
592 | unsigned char *extra = endpoint[i].extra; | |
593 | int len = endpoint[i].extralen; | |
594 | while (len > 1) { | |
595 | if (extra[1] == USB_DT_PIPE_USAGE) { | |
596 | unsigned pipe_id = extra[2]; | |
597 | if (pipe_id > 0 && pipe_id < 5) | |
598 | eps[pipe_id - 1] = &endpoint[i]; | |
599 | break; | |
600 | } | |
601 | len -= extra[0]; | |
602 | extra += extra[0]; | |
603 | } | |
604 | } | |
605 | ||
606 | /* | |
607 | * Assume that if we didn't find a control pipe descriptor, we're | |
608 | * using a device with old firmware that happens to be set up like | |
609 | * this. | |
610 | */ | |
611 | if (!eps[0]) { | |
612 | devinfo->cmd_pipe = usb_sndbulkpipe(udev, 1); | |
613 | devinfo->status_pipe = usb_rcvbulkpipe(udev, 1); | |
614 | devinfo->data_in_pipe = usb_rcvbulkpipe(udev, 2); | |
615 | devinfo->data_out_pipe = usb_sndbulkpipe(udev, 2); | |
616 | ||
617 | eps[1] = usb_pipe_endpoint(udev, devinfo->status_pipe); | |
618 | eps[2] = usb_pipe_endpoint(udev, devinfo->data_in_pipe); | |
619 | eps[3] = usb_pipe_endpoint(udev, devinfo->data_out_pipe); | |
620 | } else { | |
621 | devinfo->cmd_pipe = usb_sndbulkpipe(udev, | |
622 | eps[0]->desc.bEndpointAddress); | |
623 | devinfo->status_pipe = usb_rcvbulkpipe(udev, | |
624 | eps[1]->desc.bEndpointAddress); | |
625 | devinfo->data_in_pipe = usb_rcvbulkpipe(udev, | |
626 | eps[2]->desc.bEndpointAddress); | |
627 | devinfo->data_out_pipe = usb_sndbulkpipe(udev, | |
628 | eps[3]->desc.bEndpointAddress); | |
629 | } | |
630 | ||
631 | devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1, 3, 256, | |
632 | GFP_KERNEL); | |
633 | if (devinfo->qdepth < 0) { | |
634 | devinfo->qdepth = 256; | |
635 | devinfo->use_streams = 0; | |
636 | } else { | |
637 | devinfo->use_streams = 1; | |
638 | } | |
639 | } | |
640 | ||
641 | /* | |
642 | * XXX: What I'd like to do here is register a SCSI host for each USB host in | |
643 | * the system. Follow usb-storage's design of registering a SCSI host for | |
644 | * each USB device for the moment. Can implement this by walking up the | |
645 | * USB hierarchy until we find a USB host. | |
646 | */ | |
647 | static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
648 | { | |
649 | int result; | |
650 | struct Scsi_Host *shost; | |
651 | struct uas_dev_info *devinfo; | |
652 | struct usb_device *udev = interface_to_usbdev(intf); | |
653 | ||
654 | if (id->bInterfaceProtocol == 0x50) { | |
655 | int ifnum = intf->cur_altsetting->desc.bInterfaceNumber; | |
656 | /* XXX: Shouldn't assume that 1 is the alternative we want */ | |
657 | int ret = usb_set_interface(udev, ifnum, 1); | |
658 | if (ret) | |
659 | return -ENODEV; | |
660 | } | |
661 | ||
662 | devinfo = kmalloc(sizeof(struct uas_dev_info), GFP_KERNEL); | |
663 | if (!devinfo) | |
664 | return -ENOMEM; | |
665 | ||
666 | result = -ENOMEM; | |
667 | shost = scsi_host_alloc(&uas_host_template, sizeof(void *)); | |
668 | if (!shost) | |
669 | goto free; | |
670 | ||
671 | shost->max_cmd_len = 16 + 252; | |
672 | shost->max_id = 1; | |
673 | shost->sg_tablesize = udev->bus->sg_tablesize; | |
674 | ||
675 | result = scsi_add_host(shost, &intf->dev); | |
676 | if (result) | |
677 | goto free; | |
678 | shost->hostdata[0] = (unsigned long)devinfo; | |
679 | ||
680 | devinfo->intf = intf; | |
681 | devinfo->udev = udev; | |
682 | uas_configure_endpoints(devinfo); | |
683 | ||
684 | scsi_scan_host(shost); | |
685 | usb_set_intfdata(intf, shost); | |
686 | return result; | |
687 | free: | |
688 | kfree(devinfo); | |
689 | if (shost) | |
690 | scsi_host_put(shost); | |
691 | return result; | |
692 | } | |
693 | ||
694 | static int uas_pre_reset(struct usb_interface *intf) | |
695 | { | |
696 | /* XXX: Need to return 1 if it's not our device in error handling */ | |
697 | return 0; | |
698 | } | |
699 | ||
700 | static int uas_post_reset(struct usb_interface *intf) | |
701 | { | |
702 | /* XXX: Need to return 1 if it's not our device in error handling */ | |
703 | return 0; | |
704 | } | |
705 | ||
706 | static void uas_disconnect(struct usb_interface *intf) | |
707 | { | |
708 | struct usb_device *udev = interface_to_usbdev(intf); | |
709 | struct usb_host_endpoint *eps[3]; | |
710 | struct Scsi_Host *shost = usb_get_intfdata(intf); | |
711 | struct uas_dev_info *devinfo = (void *)shost->hostdata[0]; | |
712 | ||
713 | scsi_remove_host(shost); | |
714 | ||
715 | eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe); | |
716 | eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe); | |
717 | eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe); | |
718 | usb_free_streams(intf, eps, 3, GFP_KERNEL); | |
719 | ||
720 | kfree(devinfo); | |
721 | } | |
722 | ||
723 | /* | |
724 | * XXX: Should this plug into libusual so we can auto-upgrade devices from | |
725 | * Bulk-Only to UAS? | |
726 | */ | |
727 | static struct usb_driver uas_driver = { | |
728 | .name = "uas", | |
729 | .probe = uas_probe, | |
730 | .disconnect = uas_disconnect, | |
731 | .pre_reset = uas_pre_reset, | |
732 | .post_reset = uas_post_reset, | |
733 | .id_table = uas_usb_ids, | |
734 | }; | |
735 | ||
736 | static int uas_init(void) | |
737 | { | |
738 | return usb_register(&uas_driver); | |
739 | } | |
740 | ||
741 | static void uas_exit(void) | |
742 | { | |
743 | usb_deregister(&uas_driver); | |
744 | } | |
745 | ||
746 | module_init(uas_init); | |
747 | module_exit(uas_exit); | |
748 | ||
749 | MODULE_LICENSE("GPL"); | |
750 | MODULE_AUTHOR("Matthew Wilcox and Sarah Sharp"); |