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 | 15 | #include <linux/usb.h> |
c898add5 | 16 | #include <linux/usb/hcd.h> |
115bb1ff | 17 | #include <linux/usb/storage.h> |
348748b0 | 18 | #include <linux/usb/uas.h> |
115bb1ff MW |
19 | |
20 | #include <scsi/scsi.h> | |
21 | #include <scsi/scsi_dbg.h> | |
22 | #include <scsi/scsi_cmnd.h> | |
23 | #include <scsi/scsi_device.h> | |
24 | #include <scsi/scsi_host.h> | |
25 | #include <scsi/scsi_tcq.h> | |
26 | ||
115bb1ff MW |
27 | /* |
28 | * The r00-r01c specs define this version of the SENSE IU data structure. | |
29 | * It's still in use by several different firmware releases. | |
30 | */ | |
31 | struct sense_iu_old { | |
32 | __u8 iu_id; | |
33 | __u8 rsvd1; | |
34 | __be16 tag; | |
35 | __be16 len; | |
36 | __u8 status; | |
37 | __u8 service_response; | |
38 | __u8 sense[SCSI_SENSE_BUFFERSIZE]; | |
39 | }; | |
40 | ||
115bb1ff MW |
41 | struct uas_dev_info { |
42 | struct usb_interface *intf; | |
43 | struct usb_device *udev; | |
44 | int qdepth; | |
45 | unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe; | |
46 | unsigned use_streams:1; | |
47 | unsigned uas_sense_old:1; | |
22188f4a | 48 | struct scsi_cmnd *cmnd; |
ceb3f91f | 49 | struct urb *status_urb; /* used only if stream support is available */ |
115bb1ff MW |
50 | }; |
51 | ||
52 | enum { | |
92a3f767 MW |
53 | ALLOC_STATUS_URB = (1 << 0), |
54 | SUBMIT_STATUS_URB = (1 << 1), | |
115bb1ff MW |
55 | ALLOC_DATA_IN_URB = (1 << 2), |
56 | SUBMIT_DATA_IN_URB = (1 << 3), | |
57 | ALLOC_DATA_OUT_URB = (1 << 4), | |
58 | SUBMIT_DATA_OUT_URB = (1 << 5), | |
59 | ALLOC_CMD_URB = (1 << 6), | |
60 | SUBMIT_CMD_URB = (1 << 7), | |
e4d8318a SAS |
61 | COMPLETED_DATA_IN = (1 << 8), |
62 | COMPLETED_DATA_OUT = (1 << 9), | |
63 | DATA_COMPLETES_CMD = (1 << 10), | |
115bb1ff MW |
64 | }; |
65 | ||
66 | /* Overrides scsi_pointer */ | |
67 | struct uas_cmd_info { | |
68 | unsigned int state; | |
69 | unsigned int stream; | |
70 | struct urb *cmd_urb; | |
ceb3f91f | 71 | /* status_urb is used only if stream support isn't available */ |
92a3f767 | 72 | struct urb *status_urb; |
115bb1ff MW |
73 | struct urb *data_in_urb; |
74 | struct urb *data_out_urb; | |
75 | struct list_head list; | |
76 | }; | |
77 | ||
78 | /* I hate forward declarations, but I actually have a loop */ | |
79 | static int uas_submit_urbs(struct scsi_cmnd *cmnd, | |
80 | struct uas_dev_info *devinfo, gfp_t gfp); | |
ea9da1c7 | 81 | static void uas_do_work(struct work_struct *work); |
115bb1ff | 82 | |
ea9da1c7 | 83 | static DECLARE_WORK(uas_work, uas_do_work); |
115bb1ff MW |
84 | static DEFINE_SPINLOCK(uas_work_lock); |
85 | static LIST_HEAD(uas_work_list); | |
86 | ||
87 | static void uas_do_work(struct work_struct *work) | |
88 | { | |
89 | struct uas_cmd_info *cmdinfo; | |
ea9da1c7 | 90 | struct uas_cmd_info *temp; |
115bb1ff | 91 | struct list_head list; |
ea9da1c7 | 92 | int err; |
115bb1ff MW |
93 | |
94 | spin_lock_irq(&uas_work_lock); | |
95 | list_replace_init(&uas_work_list, &list); | |
96 | spin_unlock_irq(&uas_work_lock); | |
97 | ||
ea9da1c7 | 98 | list_for_each_entry_safe(cmdinfo, temp, &list, list) { |
115bb1ff MW |
99 | struct scsi_pointer *scp = (void *)cmdinfo; |
100 | struct scsi_cmnd *cmnd = container_of(scp, | |
101 | struct scsi_cmnd, SCp); | |
ea9da1c7 SS |
102 | err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_NOIO); |
103 | if (err) { | |
104 | list_del(&cmdinfo->list); | |
105 | spin_lock_irq(&uas_work_lock); | |
106 | list_add_tail(&cmdinfo->list, &uas_work_list); | |
107 | spin_unlock_irq(&uas_work_lock); | |
108 | schedule_work(&uas_work); | |
109 | } | |
115bb1ff MW |
110 | } |
111 | } | |
112 | ||
115bb1ff MW |
113 | static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd) |
114 | { | |
115 | struct sense_iu *sense_iu = urb->transfer_buffer; | |
116 | struct scsi_device *sdev = cmnd->device; | |
e4d8318a | 117 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; |
115bb1ff MW |
118 | |
119 | if (urb->actual_length > 16) { | |
120 | unsigned len = be16_to_cpup(&sense_iu->len); | |
121 | if (len + 16 != urb->actual_length) { | |
122 | int newlen = min(len + 16, urb->actual_length) - 16; | |
123 | if (newlen < 0) | |
124 | newlen = 0; | |
125 | sdev_printk(KERN_INFO, sdev, "%s: urb length %d " | |
126 | "disagrees with IU sense data length %d, " | |
127 | "using %d bytes of sense data\n", __func__, | |
128 | urb->actual_length, len, newlen); | |
129 | len = newlen; | |
130 | } | |
131 | memcpy(cmnd->sense_buffer, sense_iu->sense, len); | |
132 | } | |
133 | ||
134 | cmnd->result = sense_iu->status; | |
e4d8318a SAS |
135 | if (!(cmdinfo->state & DATA_COMPLETES_CMD)) |
136 | cmnd->scsi_done(cmnd); | |
115bb1ff MW |
137 | } |
138 | ||
139 | static void uas_sense_old(struct urb *urb, struct scsi_cmnd *cmnd) | |
140 | { | |
141 | struct sense_iu_old *sense_iu = urb->transfer_buffer; | |
142 | struct scsi_device *sdev = cmnd->device; | |
e4d8318a | 143 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; |
115bb1ff MW |
144 | |
145 | if (urb->actual_length > 8) { | |
146 | unsigned len = be16_to_cpup(&sense_iu->len) - 2; | |
147 | if (len + 8 != urb->actual_length) { | |
148 | int newlen = min(len + 8, urb->actual_length) - 8; | |
149 | if (newlen < 0) | |
150 | newlen = 0; | |
151 | sdev_printk(KERN_INFO, sdev, "%s: urb length %d " | |
152 | "disagrees with IU sense data length %d, " | |
153 | "using %d bytes of sense data\n", __func__, | |
154 | urb->actual_length, len, newlen); | |
155 | len = newlen; | |
156 | } | |
157 | memcpy(cmnd->sense_buffer, sense_iu->sense, len); | |
158 | } | |
159 | ||
160 | cmnd->result = sense_iu->status; | |
e4d8318a SAS |
161 | if (!(cmdinfo->state & DATA_COMPLETES_CMD)) |
162 | cmnd->scsi_done(cmnd); | |
115bb1ff MW |
163 | } |
164 | ||
165 | static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd, | |
166 | unsigned direction) | |
167 | { | |
168 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
169 | int err; | |
170 | ||
ceb3f91f | 171 | cmdinfo->state = direction; |
115bb1ff MW |
172 | err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC); |
173 | if (err) { | |
174 | spin_lock(&uas_work_lock); | |
175 | list_add_tail(&cmdinfo->list, &uas_work_list); | |
176 | spin_unlock(&uas_work_lock); | |
177 | schedule_work(&uas_work); | |
178 | } | |
179 | } | |
180 | ||
181 | static void uas_stat_cmplt(struct urb *urb) | |
182 | { | |
183 | struct iu *iu = urb->transfer_buffer; | |
22188f4a SAS |
184 | struct Scsi_Host *shost = urb->context; |
185 | struct uas_dev_info *devinfo = (void *)shost->hostdata[0]; | |
115bb1ff | 186 | struct scsi_cmnd *cmnd; |
e4d8318a | 187 | struct uas_cmd_info *cmdinfo; |
115bb1ff | 188 | u16 tag; |
ceb3f91f | 189 | int ret; |
115bb1ff MW |
190 | |
191 | if (urb->status) { | |
192 | dev_err(&urb->dev->dev, "URB BAD STATUS %d\n", urb->status); | |
ceb3f91f SAS |
193 | if (devinfo->use_streams) |
194 | usb_free_urb(urb); | |
115bb1ff MW |
195 | return; |
196 | } | |
197 | ||
198 | tag = be16_to_cpup(&iu->tag) - 1; | |
22188f4a SAS |
199 | if (tag == 0) |
200 | cmnd = devinfo->cmnd; | |
115bb1ff | 201 | else |
22188f4a | 202 | cmnd = scsi_host_find_tag(shost, tag - 1); |
96c1eb98 | 203 | if (!cmnd) { |
ceb3f91f SAS |
204 | if (devinfo->use_streams) { |
205 | usb_free_urb(urb); | |
206 | return; | |
207 | } | |
208 | ret = usb_submit_urb(urb, GFP_ATOMIC); | |
209 | if (ret) | |
210 | dev_err(&urb->dev->dev, "failed submit status urb\n"); | |
115bb1ff | 211 | return; |
96c1eb98 | 212 | } |
e4d8318a | 213 | cmdinfo = (void *)&cmnd->SCp; |
115bb1ff MW |
214 | |
215 | switch (iu->iu_id) { | |
216 | case IU_ID_STATUS: | |
22188f4a SAS |
217 | if (devinfo->cmnd == cmnd) |
218 | devinfo->cmnd = NULL; | |
219 | ||
e4d8318a SAS |
220 | if (!(cmdinfo->state & COMPLETED_DATA_IN) && |
221 | cmdinfo->data_in_urb) { | |
222 | if (devinfo->use_streams) { | |
223 | cmdinfo->state |= DATA_COMPLETES_CMD; | |
224 | usb_unlink_urb(cmdinfo->data_in_urb); | |
225 | } else { | |
226 | usb_free_urb(cmdinfo->data_in_urb); | |
227 | } | |
228 | } | |
229 | if (!(cmdinfo->state & COMPLETED_DATA_OUT) && | |
230 | cmdinfo->data_out_urb) { | |
231 | if (devinfo->use_streams) { | |
232 | cmdinfo->state |= DATA_COMPLETES_CMD; | |
233 | usb_unlink_urb(cmdinfo->data_in_urb); | |
234 | } else { | |
235 | usb_free_urb(cmdinfo->data_out_urb); | |
236 | } | |
237 | } | |
238 | ||
115bb1ff MW |
239 | if (urb->actual_length < 16) |
240 | devinfo->uas_sense_old = 1; | |
241 | if (devinfo->uas_sense_old) | |
242 | uas_sense_old(urb, cmnd); | |
243 | else | |
244 | uas_sense(urb, cmnd); | |
245 | break; | |
246 | case IU_ID_READ_READY: | |
247 | uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB); | |
248 | break; | |
249 | case IU_ID_WRITE_READY: | |
250 | uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB); | |
251 | break; | |
252 | default: | |
253 | scmd_printk(KERN_ERR, cmnd, | |
254 | "Bogus IU (%d) received on status pipe\n", iu->iu_id); | |
255 | } | |
ceb3f91f SAS |
256 | |
257 | if (devinfo->use_streams) { | |
258 | usb_free_urb(urb); | |
259 | return; | |
260 | } | |
261 | ||
262 | ret = usb_submit_urb(urb, GFP_ATOMIC); | |
263 | if (ret) | |
264 | dev_err(&urb->dev->dev, "failed submit status urb\n"); | |
115bb1ff MW |
265 | } |
266 | ||
e4d8318a SAS |
267 | static void uas_data_out_cmplt(struct urb *urb) |
268 | { | |
269 | struct scsi_cmnd *cmnd = urb->context; | |
270 | struct scsi_data_buffer *sdb = scsi_out(cmnd); | |
271 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
272 | ||
273 | cmdinfo->state |= COMPLETED_DATA_OUT; | |
274 | ||
275 | sdb->resid = sdb->length - urb->actual_length; | |
276 | usb_free_urb(urb); | |
277 | ||
278 | if (cmdinfo->state & DATA_COMPLETES_CMD) | |
279 | cmnd->scsi_done(cmnd); | |
280 | } | |
281 | ||
282 | static void uas_data_in_cmplt(struct urb *urb) | |
115bb1ff | 283 | { |
e4d8318a SAS |
284 | struct scsi_cmnd *cmnd = urb->context; |
285 | struct scsi_data_buffer *sdb = scsi_in(cmnd); | |
286 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
287 | ||
288 | cmdinfo->state |= COMPLETED_DATA_IN; | |
289 | ||
115bb1ff MW |
290 | sdb->resid = sdb->length - urb->actual_length; |
291 | usb_free_urb(urb); | |
e4d8318a SAS |
292 | |
293 | if (cmdinfo->state & DATA_COMPLETES_CMD) | |
294 | cmnd->scsi_done(cmnd); | |
115bb1ff MW |
295 | } |
296 | ||
297 | static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp, | |
e4d8318a SAS |
298 | unsigned int pipe, struct scsi_cmnd *cmnd, |
299 | enum dma_data_direction dir) | |
115bb1ff | 300 | { |
e4d8318a | 301 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; |
115bb1ff MW |
302 | struct usb_device *udev = devinfo->udev; |
303 | struct urb *urb = usb_alloc_urb(0, gfp); | |
e4d8318a SAS |
304 | struct scsi_data_buffer *sdb; |
305 | usb_complete_t complete_fn; | |
306 | u16 stream_id = cmdinfo->stream; | |
115bb1ff MW |
307 | |
308 | if (!urb) | |
309 | goto out; | |
e4d8318a SAS |
310 | if (dir == DMA_FROM_DEVICE) { |
311 | sdb = scsi_in(cmnd); | |
312 | complete_fn = uas_data_in_cmplt; | |
313 | } else { | |
314 | sdb = scsi_out(cmnd); | |
315 | complete_fn = uas_data_out_cmplt; | |
316 | } | |
317 | usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length, | |
318 | complete_fn, cmnd); | |
319 | urb->stream_id = stream_id; | |
115bb1ff MW |
320 | urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0; |
321 | urb->sg = sdb->table.sgl; | |
322 | out: | |
323 | return urb; | |
324 | } | |
325 | ||
326 | static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp, | |
ceb3f91f | 327 | struct Scsi_Host *shost, u16 stream_id) |
115bb1ff MW |
328 | { |
329 | struct usb_device *udev = devinfo->udev; | |
330 | struct urb *urb = usb_alloc_urb(0, gfp); | |
331 | struct sense_iu *iu; | |
332 | ||
333 | if (!urb) | |
334 | goto out; | |
335 | ||
ac563cfd | 336 | iu = kzalloc(sizeof(*iu), gfp); |
115bb1ff MW |
337 | if (!iu) |
338 | goto free; | |
339 | ||
340 | usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu), | |
ceb3f91f | 341 | uas_stat_cmplt, shost); |
115bb1ff MW |
342 | urb->stream_id = stream_id; |
343 | urb->transfer_flags |= URB_FREE_BUFFER; | |
344 | out: | |
345 | return urb; | |
346 | free: | |
347 | usb_free_urb(urb); | |
348 | return NULL; | |
349 | } | |
350 | ||
351 | static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp, | |
352 | struct scsi_cmnd *cmnd, u16 stream_id) | |
353 | { | |
354 | struct usb_device *udev = devinfo->udev; | |
355 | struct scsi_device *sdev = cmnd->device; | |
356 | struct urb *urb = usb_alloc_urb(0, gfp); | |
357 | struct command_iu *iu; | |
358 | int len; | |
359 | ||
360 | if (!urb) | |
361 | goto out; | |
362 | ||
363 | len = cmnd->cmd_len - 16; | |
364 | if (len < 0) | |
365 | len = 0; | |
366 | len = ALIGN(len, 4); | |
ac563cfd | 367 | iu = kzalloc(sizeof(*iu) + len, gfp); |
115bb1ff MW |
368 | if (!iu) |
369 | goto free; | |
370 | ||
371 | iu->iu_id = IU_ID_COMMAND; | |
9eb44541 | 372 | if (blk_rq_tagged(cmnd->request)) |
22188f4a | 373 | iu->tag = cpu_to_be16(cmnd->request->tag + 2); |
9eb44541 SS |
374 | else |
375 | iu->tag = cpu_to_be16(1); | |
02e031cb | 376 | iu->prio_attr = UAS_SIMPLE_TAG; |
115bb1ff MW |
377 | iu->len = len; |
378 | int_to_scsilun(sdev->lun, &iu->lun); | |
379 | memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len); | |
380 | ||
381 | usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len, | |
382 | usb_free_urb, NULL); | |
383 | urb->transfer_flags |= URB_FREE_BUFFER; | |
384 | out: | |
385 | return urb; | |
386 | free: | |
387 | usb_free_urb(urb); | |
388 | return NULL; | |
389 | } | |
390 | ||
391 | /* | |
392 | * Why should I request the Status IU before sending the Command IU? Spec | |
393 | * says to, but also says the device may receive them in any order. Seems | |
394 | * daft to me. | |
395 | */ | |
396 | ||
397 | static int uas_submit_urbs(struct scsi_cmnd *cmnd, | |
398 | struct uas_dev_info *devinfo, gfp_t gfp) | |
399 | { | |
400 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
401 | ||
92a3f767 | 402 | if (cmdinfo->state & ALLOC_STATUS_URB) { |
ceb3f91f SAS |
403 | cmdinfo->status_urb = uas_alloc_sense_urb(devinfo, gfp, |
404 | cmnd->device->host, cmdinfo->stream); | |
92a3f767 | 405 | if (!cmdinfo->status_urb) |
115bb1ff | 406 | return SCSI_MLQUEUE_DEVICE_BUSY; |
92a3f767 | 407 | cmdinfo->state &= ~ALLOC_STATUS_URB; |
115bb1ff MW |
408 | } |
409 | ||
92a3f767 MW |
410 | if (cmdinfo->state & SUBMIT_STATUS_URB) { |
411 | if (usb_submit_urb(cmdinfo->status_urb, gfp)) { | |
115bb1ff MW |
412 | scmd_printk(KERN_INFO, cmnd, |
413 | "sense urb submission failure\n"); | |
414 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
415 | } | |
92a3f767 | 416 | cmdinfo->state &= ~SUBMIT_STATUS_URB; |
115bb1ff MW |
417 | } |
418 | ||
419 | if (cmdinfo->state & ALLOC_DATA_IN_URB) { | |
420 | cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, gfp, | |
e4d8318a SAS |
421 | devinfo->data_in_pipe, cmnd, |
422 | DMA_FROM_DEVICE); | |
115bb1ff MW |
423 | if (!cmdinfo->data_in_urb) |
424 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
425 | cmdinfo->state &= ~ALLOC_DATA_IN_URB; | |
426 | } | |
427 | ||
428 | if (cmdinfo->state & SUBMIT_DATA_IN_URB) { | |
429 | if (usb_submit_urb(cmdinfo->data_in_urb, gfp)) { | |
430 | scmd_printk(KERN_INFO, cmnd, | |
431 | "data in urb submission failure\n"); | |
432 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
433 | } | |
434 | cmdinfo->state &= ~SUBMIT_DATA_IN_URB; | |
435 | } | |
436 | ||
437 | if (cmdinfo->state & ALLOC_DATA_OUT_URB) { | |
438 | cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, gfp, | |
e4d8318a SAS |
439 | devinfo->data_out_pipe, cmnd, |
440 | DMA_TO_DEVICE); | |
115bb1ff MW |
441 | if (!cmdinfo->data_out_urb) |
442 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
443 | cmdinfo->state &= ~ALLOC_DATA_OUT_URB; | |
444 | } | |
445 | ||
446 | if (cmdinfo->state & SUBMIT_DATA_OUT_URB) { | |
447 | if (usb_submit_urb(cmdinfo->data_out_urb, gfp)) { | |
448 | scmd_printk(KERN_INFO, cmnd, | |
449 | "data out urb submission failure\n"); | |
450 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
451 | } | |
452 | cmdinfo->state &= ~SUBMIT_DATA_OUT_URB; | |
453 | } | |
454 | ||
455 | if (cmdinfo->state & ALLOC_CMD_URB) { | |
456 | cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, gfp, cmnd, | |
457 | cmdinfo->stream); | |
458 | if (!cmdinfo->cmd_urb) | |
459 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
460 | cmdinfo->state &= ~ALLOC_CMD_URB; | |
461 | } | |
462 | ||
463 | if (cmdinfo->state & SUBMIT_CMD_URB) { | |
464 | if (usb_submit_urb(cmdinfo->cmd_urb, gfp)) { | |
465 | scmd_printk(KERN_INFO, cmnd, | |
466 | "cmd urb submission failure\n"); | |
467 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
468 | } | |
469 | cmdinfo->state &= ~SUBMIT_CMD_URB; | |
470 | } | |
471 | ||
472 | return 0; | |
473 | } | |
474 | ||
f281233d | 475 | static int uas_queuecommand_lck(struct scsi_cmnd *cmnd, |
115bb1ff MW |
476 | void (*done)(struct scsi_cmnd *)) |
477 | { | |
478 | struct scsi_device *sdev = cmnd->device; | |
479 | struct uas_dev_info *devinfo = sdev->hostdata; | |
480 | struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; | |
481 | int err; | |
482 | ||
483 | BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer)); | |
484 | ||
22188f4a | 485 | if (devinfo->cmnd) |
115bb1ff MW |
486 | return SCSI_MLQUEUE_DEVICE_BUSY; |
487 | ||
488 | if (blk_rq_tagged(cmnd->request)) { | |
22188f4a | 489 | cmdinfo->stream = cmnd->request->tag + 2; |
115bb1ff | 490 | } else { |
22188f4a | 491 | devinfo->cmnd = cmnd; |
115bb1ff MW |
492 | cmdinfo->stream = 1; |
493 | } | |
494 | ||
495 | cmnd->scsi_done = done; | |
496 | ||
92a3f767 | 497 | cmdinfo->state = ALLOC_STATUS_URB | SUBMIT_STATUS_URB | |
115bb1ff MW |
498 | ALLOC_CMD_URB | SUBMIT_CMD_URB; |
499 | ||
500 | switch (cmnd->sc_data_direction) { | |
501 | case DMA_FROM_DEVICE: | |
502 | cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB; | |
503 | break; | |
504 | case DMA_BIDIRECTIONAL: | |
505 | cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB; | |
506 | case DMA_TO_DEVICE: | |
507 | cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB; | |
508 | case DMA_NONE: | |
509 | break; | |
510 | } | |
511 | ||
512 | if (!devinfo->use_streams) { | |
ceb3f91f SAS |
513 | cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB | |
514 | ALLOC_STATUS_URB | SUBMIT_STATUS_URB); | |
115bb1ff MW |
515 | cmdinfo->stream = 0; |
516 | } | |
517 | ||
518 | err = uas_submit_urbs(cmnd, devinfo, GFP_ATOMIC); | |
519 | if (err) { | |
520 | /* If we did nothing, give up now */ | |
92a3f767 MW |
521 | if (cmdinfo->state & SUBMIT_STATUS_URB) { |
522 | usb_free_urb(cmdinfo->status_urb); | |
115bb1ff MW |
523 | return SCSI_MLQUEUE_DEVICE_BUSY; |
524 | } | |
525 | spin_lock(&uas_work_lock); | |
526 | list_add_tail(&cmdinfo->list, &uas_work_list); | |
527 | spin_unlock(&uas_work_lock); | |
528 | schedule_work(&uas_work); | |
529 | } | |
530 | ||
531 | return 0; | |
532 | } | |
533 | ||
f281233d JG |
534 | static DEF_SCSI_QCMD(uas_queuecommand) |
535 | ||
115bb1ff MW |
536 | static int uas_eh_abort_handler(struct scsi_cmnd *cmnd) |
537 | { | |
538 | struct scsi_device *sdev = cmnd->device; | |
539 | sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__, | |
540 | cmnd->request->tag); | |
541 | ||
542 | /* XXX: Send ABORT TASK Task Management command */ | |
543 | return FAILED; | |
544 | } | |
545 | ||
546 | static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd) | |
547 | { | |
548 | struct scsi_device *sdev = cmnd->device; | |
549 | sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__, | |
550 | cmnd->request->tag); | |
551 | ||
552 | /* XXX: Send LOGICAL UNIT RESET Task Management command */ | |
553 | return FAILED; | |
554 | } | |
555 | ||
556 | static int uas_eh_target_reset_handler(struct scsi_cmnd *cmnd) | |
557 | { | |
558 | struct scsi_device *sdev = cmnd->device; | |
559 | sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__, | |
560 | cmnd->request->tag); | |
561 | ||
562 | /* XXX: Can we reset just the one USB interface? | |
563 | * Would calling usb_set_interface() have the right effect? | |
564 | */ | |
565 | return FAILED; | |
566 | } | |
567 | ||
568 | static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd) | |
569 | { | |
570 | struct scsi_device *sdev = cmnd->device; | |
571 | struct uas_dev_info *devinfo = sdev->hostdata; | |
572 | struct usb_device *udev = devinfo->udev; | |
573 | ||
574 | sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__, | |
575 | cmnd->request->tag); | |
576 | ||
577 | if (usb_reset_device(udev)) | |
578 | return SUCCESS; | |
579 | ||
580 | return FAILED; | |
581 | } | |
582 | ||
583 | static int uas_slave_alloc(struct scsi_device *sdev) | |
584 | { | |
585 | sdev->hostdata = (void *)sdev->host->hostdata[0]; | |
586 | return 0; | |
587 | } | |
588 | ||
589 | static int uas_slave_configure(struct scsi_device *sdev) | |
590 | { | |
591 | struct uas_dev_info *devinfo = sdev->hostdata; | |
592 | scsi_set_tag_type(sdev, MSG_ORDERED_TAG); | |
22188f4a | 593 | scsi_activate_tcq(sdev, devinfo->qdepth - 2); |
115bb1ff MW |
594 | return 0; |
595 | } | |
596 | ||
597 | static struct scsi_host_template uas_host_template = { | |
598 | .module = THIS_MODULE, | |
599 | .name = "uas", | |
600 | .queuecommand = uas_queuecommand, | |
601 | .slave_alloc = uas_slave_alloc, | |
602 | .slave_configure = uas_slave_configure, | |
603 | .eh_abort_handler = uas_eh_abort_handler, | |
604 | .eh_device_reset_handler = uas_eh_device_reset_handler, | |
605 | .eh_target_reset_handler = uas_eh_target_reset_handler, | |
606 | .eh_bus_reset_handler = uas_eh_bus_reset_handler, | |
607 | .can_queue = 65536, /* Is there a limit on the _host_ ? */ | |
608 | .this_id = -1, | |
609 | .sg_tablesize = SG_NONE, | |
610 | .cmd_per_lun = 1, /* until we override it */ | |
611 | .skip_settle_delay = 1, | |
612 | .ordered_tag = 1, | |
613 | }; | |
614 | ||
615 | static struct usb_device_id uas_usb_ids[] = { | |
616 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) }, | |
617 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) }, | |
618 | /* 0xaa is a prototype device I happen to have access to */ | |
619 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, 0xaa) }, | |
620 | { } | |
621 | }; | |
622 | MODULE_DEVICE_TABLE(usb, uas_usb_ids); | |
623 | ||
89dc2905 MW |
624 | static int uas_is_interface(struct usb_host_interface *intf) |
625 | { | |
626 | return (intf->desc.bInterfaceClass == USB_CLASS_MASS_STORAGE && | |
627 | intf->desc.bInterfaceSubClass == USB_SC_SCSI && | |
628 | intf->desc.bInterfaceProtocol == USB_PR_UAS); | |
629 | } | |
630 | ||
c898add5 SAS |
631 | static int uas_isnt_supported(struct usb_device *udev) |
632 | { | |
633 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
634 | ||
635 | dev_warn(&udev->dev, "The driver for the USB controller %s does not " | |
636 | "support scatter-gather which is\n", | |
637 | hcd->driver->description); | |
638 | dev_warn(&udev->dev, "required by the UAS driver. Please try an" | |
639 | "alternative USB controller if you wish to use UAS.\n"); | |
640 | return -ENODEV; | |
641 | } | |
642 | ||
89dc2905 MW |
643 | static int uas_switch_interface(struct usb_device *udev, |
644 | struct usb_interface *intf) | |
645 | { | |
646 | int i; | |
c898add5 | 647 | int sg_supported = udev->bus->sg_tablesize != 0; |
89dc2905 MW |
648 | |
649 | for (i = 0; i < intf->num_altsetting; i++) { | |
650 | struct usb_host_interface *alt = &intf->altsetting[i]; | |
c898add5 SAS |
651 | |
652 | if (uas_is_interface(alt)) { | |
653 | if (!sg_supported) | |
654 | return uas_isnt_supported(udev); | |
89dc2905 MW |
655 | return usb_set_interface(udev, |
656 | alt->desc.bInterfaceNumber, | |
657 | alt->desc.bAlternateSetting); | |
c898add5 | 658 | } |
89dc2905 MW |
659 | } |
660 | ||
661 | return -ENODEV; | |
662 | } | |
663 | ||
115bb1ff MW |
664 | static void uas_configure_endpoints(struct uas_dev_info *devinfo) |
665 | { | |
666 | struct usb_host_endpoint *eps[4] = { }; | |
667 | struct usb_interface *intf = devinfo->intf; | |
668 | struct usb_device *udev = devinfo->udev; | |
669 | struct usb_host_endpoint *endpoint = intf->cur_altsetting->endpoint; | |
670 | unsigned i, n_endpoints = intf->cur_altsetting->desc.bNumEndpoints; | |
671 | ||
672 | devinfo->uas_sense_old = 0; | |
22188f4a | 673 | devinfo->cmnd = NULL; |
115bb1ff MW |
674 | |
675 | for (i = 0; i < n_endpoints; i++) { | |
676 | unsigned char *extra = endpoint[i].extra; | |
677 | int len = endpoint[i].extralen; | |
678 | while (len > 1) { | |
679 | if (extra[1] == USB_DT_PIPE_USAGE) { | |
680 | unsigned pipe_id = extra[2]; | |
681 | if (pipe_id > 0 && pipe_id < 5) | |
682 | eps[pipe_id - 1] = &endpoint[i]; | |
683 | break; | |
684 | } | |
685 | len -= extra[0]; | |
686 | extra += extra[0]; | |
687 | } | |
688 | } | |
689 | ||
690 | /* | |
691 | * Assume that if we didn't find a control pipe descriptor, we're | |
692 | * using a device with old firmware that happens to be set up like | |
693 | * this. | |
694 | */ | |
695 | if (!eps[0]) { | |
696 | devinfo->cmd_pipe = usb_sndbulkpipe(udev, 1); | |
697 | devinfo->status_pipe = usb_rcvbulkpipe(udev, 1); | |
698 | devinfo->data_in_pipe = usb_rcvbulkpipe(udev, 2); | |
699 | devinfo->data_out_pipe = usb_sndbulkpipe(udev, 2); | |
700 | ||
701 | eps[1] = usb_pipe_endpoint(udev, devinfo->status_pipe); | |
702 | eps[2] = usb_pipe_endpoint(udev, devinfo->data_in_pipe); | |
703 | eps[3] = usb_pipe_endpoint(udev, devinfo->data_out_pipe); | |
704 | } else { | |
705 | devinfo->cmd_pipe = usb_sndbulkpipe(udev, | |
706 | eps[0]->desc.bEndpointAddress); | |
707 | devinfo->status_pipe = usb_rcvbulkpipe(udev, | |
708 | eps[1]->desc.bEndpointAddress); | |
709 | devinfo->data_in_pipe = usb_rcvbulkpipe(udev, | |
710 | eps[2]->desc.bEndpointAddress); | |
711 | devinfo->data_out_pipe = usb_sndbulkpipe(udev, | |
712 | eps[3]->desc.bEndpointAddress); | |
713 | } | |
714 | ||
715 | devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1, 3, 256, | |
716 | GFP_KERNEL); | |
717 | if (devinfo->qdepth < 0) { | |
718 | devinfo->qdepth = 256; | |
719 | devinfo->use_streams = 0; | |
720 | } else { | |
721 | devinfo->use_streams = 1; | |
722 | } | |
723 | } | |
724 | ||
ceb3f91f SAS |
725 | static int uas_alloc_status_urb(struct uas_dev_info *devinfo, |
726 | struct Scsi_Host *shost) | |
727 | { | |
728 | if (devinfo->use_streams) { | |
729 | devinfo->status_urb = NULL; | |
730 | return 0; | |
731 | } | |
732 | ||
733 | devinfo->status_urb = uas_alloc_sense_urb(devinfo, GFP_KERNEL, | |
734 | shost, 0); | |
735 | if (!devinfo->status_urb) | |
736 | goto err_s_urb; | |
737 | ||
738 | if (usb_submit_urb(devinfo->status_urb, GFP_KERNEL)) | |
739 | goto err_submit_urb; | |
740 | ||
741 | return 0; | |
742 | err_submit_urb: | |
743 | usb_free_urb(devinfo->status_urb); | |
744 | err_s_urb: | |
745 | return -ENOMEM; | |
746 | } | |
747 | ||
dae51546 SAS |
748 | static void uas_free_streams(struct uas_dev_info *devinfo) |
749 | { | |
750 | struct usb_device *udev = devinfo->udev; | |
751 | struct usb_host_endpoint *eps[3]; | |
752 | ||
753 | eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe); | |
754 | eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe); | |
755 | eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe); | |
756 | usb_free_streams(devinfo->intf, eps, 3, GFP_KERNEL); | |
757 | } | |
758 | ||
115bb1ff MW |
759 | /* |
760 | * XXX: What I'd like to do here is register a SCSI host for each USB host in | |
761 | * the system. Follow usb-storage's design of registering a SCSI host for | |
762 | * each USB device for the moment. Can implement this by walking up the | |
763 | * USB hierarchy until we find a USB host. | |
764 | */ | |
765 | static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
766 | { | |
767 | int result; | |
768 | struct Scsi_Host *shost; | |
769 | struct uas_dev_info *devinfo; | |
770 | struct usb_device *udev = interface_to_usbdev(intf); | |
771 | ||
89dc2905 MW |
772 | if (uas_switch_interface(udev, intf)) |
773 | return -ENODEV; | |
115bb1ff MW |
774 | |
775 | devinfo = kmalloc(sizeof(struct uas_dev_info), GFP_KERNEL); | |
776 | if (!devinfo) | |
777 | return -ENOMEM; | |
778 | ||
779 | result = -ENOMEM; | |
780 | shost = scsi_host_alloc(&uas_host_template, sizeof(void *)); | |
781 | if (!shost) | |
782 | goto free; | |
783 | ||
784 | shost->max_cmd_len = 16 + 252; | |
785 | shost->max_id = 1; | |
786 | shost->sg_tablesize = udev->bus->sg_tablesize; | |
787 | ||
115bb1ff MW |
788 | devinfo->intf = intf; |
789 | devinfo->udev = udev; | |
790 | uas_configure_endpoints(devinfo); | |
791 | ||
22188f4a | 792 | result = scsi_init_shared_tag_map(shost, devinfo->qdepth - 2); |
115bb1ff MW |
793 | if (result) |
794 | goto free; | |
dae51546 SAS |
795 | |
796 | result = scsi_add_host(shost, &intf->dev); | |
797 | if (result) | |
798 | goto deconfig_eps; | |
799 | ||
115bb1ff MW |
800 | shost->hostdata[0] = (unsigned long)devinfo; |
801 | ||
ceb3f91f SAS |
802 | result = uas_alloc_status_urb(devinfo, shost); |
803 | if (result) | |
804 | goto err_alloc_status; | |
115bb1ff MW |
805 | |
806 | scsi_scan_host(shost); | |
807 | usb_set_intfdata(intf, shost); | |
808 | return result; | |
dae51546 | 809 | |
ceb3f91f SAS |
810 | err_alloc_status: |
811 | scsi_remove_host(shost); | |
812 | shost = NULL; | |
dae51546 SAS |
813 | deconfig_eps: |
814 | uas_free_streams(devinfo); | |
115bb1ff MW |
815 | free: |
816 | kfree(devinfo); | |
817 | if (shost) | |
818 | scsi_host_put(shost); | |
819 | return result; | |
820 | } | |
821 | ||
822 | static int uas_pre_reset(struct usb_interface *intf) | |
823 | { | |
824 | /* XXX: Need to return 1 if it's not our device in error handling */ | |
825 | return 0; | |
826 | } | |
827 | ||
828 | static int uas_post_reset(struct usb_interface *intf) | |
829 | { | |
830 | /* XXX: Need to return 1 if it's not our device in error handling */ | |
831 | return 0; | |
832 | } | |
833 | ||
834 | static void uas_disconnect(struct usb_interface *intf) | |
835 | { | |
115bb1ff MW |
836 | struct Scsi_Host *shost = usb_get_intfdata(intf); |
837 | struct uas_dev_info *devinfo = (void *)shost->hostdata[0]; | |
838 | ||
839 | scsi_remove_host(shost); | |
ceb3f91f SAS |
840 | usb_kill_urb(devinfo->status_urb); |
841 | usb_free_urb(devinfo->status_urb); | |
dae51546 | 842 | uas_free_streams(devinfo); |
115bb1ff MW |
843 | kfree(devinfo); |
844 | } | |
845 | ||
846 | /* | |
847 | * XXX: Should this plug into libusual so we can auto-upgrade devices from | |
848 | * Bulk-Only to UAS? | |
849 | */ | |
850 | static struct usb_driver uas_driver = { | |
851 | .name = "uas", | |
852 | .probe = uas_probe, | |
853 | .disconnect = uas_disconnect, | |
854 | .pre_reset = uas_pre_reset, | |
855 | .post_reset = uas_post_reset, | |
856 | .id_table = uas_usb_ids, | |
857 | }; | |
858 | ||
65db4305 | 859 | module_usb_driver(uas_driver); |
115bb1ff MW |
860 | |
861 | MODULE_LICENSE("GPL"); | |
862 | MODULE_AUTHOR("Matthew Wilcox and Sarah Sharp"); |