Commit | Line | Data |
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df365423 IPG |
1 | /* |
2 | * WUSB Wire Adapter | |
3 | * Data transfer and URB enqueing | |
4 | * | |
5 | * Copyright (C) 2005-2006 Intel Corporation | |
6 | * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License version | |
10 | * 2 as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
20 | * 02110-1301, USA. | |
21 | * | |
22 | * | |
23 | * How transfers work: get a buffer, break it up in segments (segment | |
24 | * size is a multiple of the maxpacket size). For each segment issue a | |
25 | * segment request (struct wa_xfer_*), then send the data buffer if | |
26 | * out or nothing if in (all over the DTO endpoint). | |
27 | * | |
28 | * For each submitted segment request, a notification will come over | |
29 | * the NEP endpoint and a transfer result (struct xfer_result) will | |
30 | * arrive in the DTI URB. Read it, get the xfer ID, see if there is | |
31 | * data coming (inbound transfer), schedule a read and handle it. | |
32 | * | |
33 | * Sounds simple, it is a pain to implement. | |
34 | * | |
35 | * | |
36 | * ENTRY POINTS | |
37 | * | |
38 | * FIXME | |
39 | * | |
40 | * LIFE CYCLE / STATE DIAGRAM | |
41 | * | |
42 | * FIXME | |
43 | * | |
44 | * THIS CODE IS DISGUSTING | |
45 | * | |
46 | * Warned you are; it's my second try and still not happy with it. | |
47 | * | |
48 | * NOTES: | |
49 | * | |
50 | * - No iso | |
51 | * | |
52 | * - Supports DMA xfers, control, bulk and maybe interrupt | |
53 | * | |
54 | * - Does not recycle unused rpipes | |
55 | * | |
56 | * An rpipe is assigned to an endpoint the first time it is used, | |
57 | * and then it's there, assigned, until the endpoint is disabled | |
58 | * (destroyed [{h,d}wahc_op_ep_disable()]. The assignment of the | |
59 | * rpipe to the endpoint is done under the wa->rpipe_sem semaphore | |
60 | * (should be a mutex). | |
61 | * | |
62 | * Two methods it could be done: | |
63 | * | |
64 | * (a) set up a timer everytime an rpipe's use count drops to 1 | |
65 | * (which means unused) or when a transfer ends. Reset the | |
66 | * timer when a xfer is queued. If the timer expires, release | |
67 | * the rpipe [see rpipe_ep_disable()]. | |
68 | * | |
69 | * (b) when looking for free rpipes to attach [rpipe_get_by_ep()], | |
70 | * when none are found go over the list, check their endpoint | |
71 | * and their activity record (if no last-xfer-done-ts in the | |
72 | * last x seconds) take it | |
73 | * | |
74 | * However, due to the fact that we have a set of limited | |
75 | * resources (max-segments-at-the-same-time per xfer, | |
76 | * xfers-per-ripe, blocks-per-rpipe, rpipes-per-host), at the end | |
77 | * we are going to have to rebuild all this based on an scheduler, | |
78 | * to where we have a list of transactions to do and based on the | |
79 | * availability of the different requried components (blocks, | |
80 | * rpipes, segment slots, etc), we go scheduling them. Painful. | |
81 | */ | |
82 | #include <linux/init.h> | |
83 | #include <linux/spinlock.h> | |
84 | #include <linux/hash.h> | |
bce83697 | 85 | |
df365423 IPG |
86 | #include "wa-hc.h" |
87 | #include "wusbhc.h" | |
88 | ||
df365423 IPG |
89 | enum { |
90 | WA_SEGS_MAX = 255, | |
91 | }; | |
92 | ||
93 | enum wa_seg_status { | |
94 | WA_SEG_NOTREADY, | |
95 | WA_SEG_READY, | |
96 | WA_SEG_DELAYED, | |
97 | WA_SEG_SUBMITTED, | |
98 | WA_SEG_PENDING, | |
99 | WA_SEG_DTI_PENDING, | |
100 | WA_SEG_DONE, | |
101 | WA_SEG_ERROR, | |
102 | WA_SEG_ABORTED, | |
103 | }; | |
104 | ||
105 | static void wa_xfer_delayed_run(struct wa_rpipe *); | |
106 | ||
107 | /* | |
108 | * Life cycle governed by 'struct urb' (the refcount of the struct is | |
109 | * that of the 'struct urb' and usb_free_urb() would free the whole | |
110 | * struct). | |
111 | */ | |
112 | struct wa_seg { | |
113 | struct urb urb; | |
114 | struct urb *dto_urb; /* for data output? */ | |
115 | struct list_head list_node; /* for rpipe->req_list */ | |
116 | struct wa_xfer *xfer; /* out xfer */ | |
117 | u8 index; /* which segment we are */ | |
118 | enum wa_seg_status status; | |
119 | ssize_t result; /* bytes xfered or error */ | |
120 | struct wa_xfer_hdr xfer_hdr; | |
121 | u8 xfer_extra[]; /* xtra space for xfer_hdr_ctl */ | |
122 | }; | |
123 | ||
124 | static void wa_seg_init(struct wa_seg *seg) | |
125 | { | |
126 | /* usb_init_urb() repeats a lot of work, so we do it here */ | |
127 | kref_init(&seg->urb.kref); | |
128 | } | |
129 | ||
130 | /* | |
131 | * Protected by xfer->lock | |
132 | * | |
133 | */ | |
134 | struct wa_xfer { | |
135 | struct kref refcnt; | |
136 | struct list_head list_node; | |
137 | spinlock_t lock; | |
138 | u32 id; | |
139 | ||
140 | struct wahc *wa; /* Wire adapter we are plugged to */ | |
141 | struct usb_host_endpoint *ep; | |
142 | struct urb *urb; /* URB we are transfering for */ | |
143 | struct wa_seg **seg; /* transfer segments */ | |
144 | u8 segs, segs_submitted, segs_done; | |
145 | unsigned is_inbound:1; | |
146 | unsigned is_dma:1; | |
147 | size_t seg_size; | |
148 | int result; | |
149 | ||
150 | gfp_t gfp; /* allocation mask */ | |
151 | ||
152 | struct wusb_dev *wusb_dev; /* for activity timestamps */ | |
153 | }; | |
154 | ||
155 | static inline void wa_xfer_init(struct wa_xfer *xfer) | |
156 | { | |
157 | kref_init(&xfer->refcnt); | |
158 | INIT_LIST_HEAD(&xfer->list_node); | |
159 | spin_lock_init(&xfer->lock); | |
160 | } | |
161 | ||
162 | /* | |
163 | * Destory a transfer structure | |
164 | * | |
165 | * Note that the xfer->seg[index] thingies follow the URB life cycle, | |
166 | * so we need to put them, not free them. | |
167 | */ | |
168 | static void wa_xfer_destroy(struct kref *_xfer) | |
169 | { | |
170 | struct wa_xfer *xfer = container_of(_xfer, struct wa_xfer, refcnt); | |
171 | if (xfer->seg) { | |
172 | unsigned cnt; | |
173 | for (cnt = 0; cnt < xfer->segs; cnt++) { | |
174 | if (xfer->is_inbound) | |
175 | usb_put_urb(xfer->seg[cnt]->dto_urb); | |
176 | usb_put_urb(&xfer->seg[cnt]->urb); | |
177 | } | |
178 | } | |
179 | kfree(xfer); | |
df365423 IPG |
180 | } |
181 | ||
182 | static void wa_xfer_get(struct wa_xfer *xfer) | |
183 | { | |
184 | kref_get(&xfer->refcnt); | |
185 | } | |
186 | ||
187 | static void wa_xfer_put(struct wa_xfer *xfer) | |
188 | { | |
df365423 | 189 | kref_put(&xfer->refcnt, wa_xfer_destroy); |
df365423 IPG |
190 | } |
191 | ||
192 | /* | |
193 | * xfer is referenced | |
194 | * | |
195 | * xfer->lock has to be unlocked | |
196 | * | |
197 | * We take xfer->lock for setting the result; this is a barrier | |
198 | * against drivers/usb/core/hcd.c:unlink1() being called after we call | |
199 | * usb_hcd_giveback_urb() and wa_urb_dequeue() trying to get a | |
200 | * reference to the transfer. | |
201 | */ | |
202 | static void wa_xfer_giveback(struct wa_xfer *xfer) | |
203 | { | |
204 | unsigned long flags; | |
bce83697 | 205 | |
df365423 IPG |
206 | spin_lock_irqsave(&xfer->wa->xfer_list_lock, flags); |
207 | list_del_init(&xfer->list_node); | |
208 | spin_unlock_irqrestore(&xfer->wa->xfer_list_lock, flags); | |
209 | /* FIXME: segmentation broken -- kills DWA */ | |
210 | wusbhc_giveback_urb(xfer->wa->wusb, xfer->urb, xfer->result); | |
211 | wa_put(xfer->wa); | |
212 | wa_xfer_put(xfer); | |
df365423 IPG |
213 | } |
214 | ||
215 | /* | |
216 | * xfer is referenced | |
217 | * | |
218 | * xfer->lock has to be unlocked | |
219 | */ | |
220 | static void wa_xfer_completion(struct wa_xfer *xfer) | |
221 | { | |
df365423 IPG |
222 | if (xfer->wusb_dev) |
223 | wusb_dev_put(xfer->wusb_dev); | |
224 | rpipe_put(xfer->ep->hcpriv); | |
225 | wa_xfer_giveback(xfer); | |
df365423 IPG |
226 | } |
227 | ||
228 | /* | |
229 | * If transfer is done, wrap it up and return true | |
230 | * | |
231 | * xfer->lock has to be locked | |
232 | */ | |
233 | static unsigned __wa_xfer_is_done(struct wa_xfer *xfer) | |
234 | { | |
bce83697 | 235 | struct device *dev = &xfer->wa->usb_iface->dev; |
df365423 IPG |
236 | unsigned result, cnt; |
237 | struct wa_seg *seg; | |
238 | struct urb *urb = xfer->urb; | |
239 | unsigned found_short = 0; | |
240 | ||
df365423 IPG |
241 | result = xfer->segs_done == xfer->segs_submitted; |
242 | if (result == 0) | |
243 | goto out; | |
244 | urb->actual_length = 0; | |
245 | for (cnt = 0; cnt < xfer->segs; cnt++) { | |
246 | seg = xfer->seg[cnt]; | |
247 | switch (seg->status) { | |
248 | case WA_SEG_DONE: | |
249 | if (found_short && seg->result > 0) { | |
bce83697 DV |
250 | dev_dbg(dev, "xfer %p#%u: bad short segments (%zu)\n", |
251 | xfer, cnt, seg->result); | |
df365423 IPG |
252 | urb->status = -EINVAL; |
253 | goto out; | |
254 | } | |
255 | urb->actual_length += seg->result; | |
256 | if (seg->result < xfer->seg_size | |
257 | && cnt != xfer->segs-1) | |
258 | found_short = 1; | |
bce83697 DV |
259 | dev_dbg(dev, "xfer %p#%u: DONE short %d " |
260 | "result %zu urb->actual_length %d\n", | |
261 | xfer, seg->index, found_short, seg->result, | |
262 | urb->actual_length); | |
df365423 IPG |
263 | break; |
264 | case WA_SEG_ERROR: | |
265 | xfer->result = seg->result; | |
bce83697 DV |
266 | dev_dbg(dev, "xfer %p#%u: ERROR result %zu\n", |
267 | xfer, seg->index, seg->result); | |
df365423 IPG |
268 | goto out; |
269 | case WA_SEG_ABORTED: | |
bce83697 DV |
270 | dev_dbg(dev, "xfer %p#%u ABORTED: result %d\n", |
271 | xfer, seg->index, urb->status); | |
df365423 IPG |
272 | xfer->result = urb->status; |
273 | goto out; | |
274 | default: | |
bce83697 DV |
275 | dev_warn(dev, "xfer %p#%u: is_done bad state %d\n", |
276 | xfer, cnt, seg->status); | |
df365423 | 277 | xfer->result = -EINVAL; |
df365423 IPG |
278 | goto out; |
279 | } | |
280 | } | |
281 | xfer->result = 0; | |
282 | out: | |
df365423 IPG |
283 | return result; |
284 | } | |
285 | ||
286 | /* | |
287 | * Initialize a transfer's ID | |
288 | * | |
289 | * We need to use a sequential number; if we use the pointer or the | |
290 | * hash of the pointer, it can repeat over sequential transfers and | |
291 | * then it will confuse the HWA....wonder why in hell they put a 32 | |
292 | * bit handle in there then. | |
293 | */ | |
294 | static void wa_xfer_id_init(struct wa_xfer *xfer) | |
295 | { | |
296 | xfer->id = atomic_add_return(1, &xfer->wa->xfer_id_count); | |
297 | } | |
298 | ||
299 | /* | |
300 | * Return the xfer's ID associated with xfer | |
301 | * | |
302 | * Need to generate a | |
303 | */ | |
304 | static u32 wa_xfer_id(struct wa_xfer *xfer) | |
305 | { | |
306 | return xfer->id; | |
307 | } | |
308 | ||
309 | /* | |
310 | * Search for a transfer list ID on the HCD's URB list | |
311 | * | |
312 | * For 32 bit architectures, we use the pointer itself; for 64 bits, a | |
313 | * 32-bit hash of the pointer. | |
314 | * | |
315 | * @returns NULL if not found. | |
316 | */ | |
317 | static struct wa_xfer *wa_xfer_get_by_id(struct wahc *wa, u32 id) | |
318 | { | |
319 | unsigned long flags; | |
320 | struct wa_xfer *xfer_itr; | |
321 | spin_lock_irqsave(&wa->xfer_list_lock, flags); | |
322 | list_for_each_entry(xfer_itr, &wa->xfer_list, list_node) { | |
323 | if (id == xfer_itr->id) { | |
324 | wa_xfer_get(xfer_itr); | |
325 | goto out; | |
326 | } | |
327 | } | |
328 | xfer_itr = NULL; | |
329 | out: | |
330 | spin_unlock_irqrestore(&wa->xfer_list_lock, flags); | |
331 | return xfer_itr; | |
332 | } | |
333 | ||
334 | struct wa_xfer_abort_buffer { | |
335 | struct urb urb; | |
336 | struct wa_xfer_abort cmd; | |
337 | }; | |
338 | ||
339 | static void __wa_xfer_abort_cb(struct urb *urb) | |
340 | { | |
341 | struct wa_xfer_abort_buffer *b = urb->context; | |
342 | usb_put_urb(&b->urb); | |
343 | } | |
344 | ||
345 | /* | |
346 | * Aborts an ongoing transaction | |
347 | * | |
348 | * Assumes the transfer is referenced and locked and in a submitted | |
349 | * state (mainly that there is an endpoint/rpipe assigned). | |
350 | * | |
351 | * The callback (see above) does nothing but freeing up the data by | |
352 | * putting the URB. Because the URB is allocated at the head of the | |
353 | * struct, the whole space we allocated is kfreed. | |
354 | * | |
355 | * We'll get an 'aborted transaction' xfer result on DTI, that'll | |
356 | * politely ignore because at this point the transaction has been | |
357 | * marked as aborted already. | |
358 | */ | |
359 | static void __wa_xfer_abort(struct wa_xfer *xfer) | |
360 | { | |
361 | int result; | |
362 | struct device *dev = &xfer->wa->usb_iface->dev; | |
363 | struct wa_xfer_abort_buffer *b; | |
364 | struct wa_rpipe *rpipe = xfer->ep->hcpriv; | |
365 | ||
366 | b = kmalloc(sizeof(*b), GFP_ATOMIC); | |
367 | if (b == NULL) | |
368 | goto error_kmalloc; | |
369 | b->cmd.bLength = sizeof(b->cmd); | |
370 | b->cmd.bRequestType = WA_XFER_ABORT; | |
371 | b->cmd.wRPipe = rpipe->descr.wRPipeIndex; | |
372 | b->cmd.dwTransferID = wa_xfer_id(xfer); | |
373 | ||
374 | usb_init_urb(&b->urb); | |
375 | usb_fill_bulk_urb(&b->urb, xfer->wa->usb_dev, | |
376 | usb_sndbulkpipe(xfer->wa->usb_dev, | |
377 | xfer->wa->dto_epd->bEndpointAddress), | |
378 | &b->cmd, sizeof(b->cmd), __wa_xfer_abort_cb, b); | |
379 | result = usb_submit_urb(&b->urb, GFP_ATOMIC); | |
380 | if (result < 0) | |
381 | goto error_submit; | |
382 | return; /* callback frees! */ | |
383 | ||
384 | ||
385 | error_submit: | |
386 | if (printk_ratelimit()) | |
387 | dev_err(dev, "xfer %p: Can't submit abort request: %d\n", | |
388 | xfer, result); | |
389 | kfree(b); | |
390 | error_kmalloc: | |
391 | return; | |
392 | ||
393 | } | |
394 | ||
395 | /* | |
396 | * | |
397 | * @returns < 0 on error, transfer segment request size if ok | |
398 | */ | |
399 | static ssize_t __wa_xfer_setup_sizes(struct wa_xfer *xfer, | |
400 | enum wa_xfer_type *pxfer_type) | |
401 | { | |
402 | ssize_t result; | |
403 | struct device *dev = &xfer->wa->usb_iface->dev; | |
404 | size_t maxpktsize; | |
405 | struct urb *urb = xfer->urb; | |
406 | struct wa_rpipe *rpipe = xfer->ep->hcpriv; | |
407 | ||
df365423 IPG |
408 | switch (rpipe->descr.bmAttribute & 0x3) { |
409 | case USB_ENDPOINT_XFER_CONTROL: | |
410 | *pxfer_type = WA_XFER_TYPE_CTL; | |
411 | result = sizeof(struct wa_xfer_ctl); | |
412 | break; | |
413 | case USB_ENDPOINT_XFER_INT: | |
414 | case USB_ENDPOINT_XFER_BULK: | |
415 | *pxfer_type = WA_XFER_TYPE_BI; | |
416 | result = sizeof(struct wa_xfer_bi); | |
417 | break; | |
418 | case USB_ENDPOINT_XFER_ISOC: | |
419 | dev_err(dev, "FIXME: ISOC not implemented\n"); | |
420 | result = -ENOSYS; | |
421 | goto error; | |
422 | default: | |
423 | /* never happens */ | |
424 | BUG(); | |
425 | result = -EINVAL; /* shut gcc up */ | |
426 | }; | |
427 | xfer->is_inbound = urb->pipe & USB_DIR_IN ? 1 : 0; | |
428 | xfer->is_dma = urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP ? 1 : 0; | |
429 | xfer->seg_size = le16_to_cpu(rpipe->descr.wBlocks) | |
430 | * 1 << (xfer->wa->wa_descr->bRPipeBlockSize - 1); | |
431 | /* Compute the segment size and make sure it is a multiple of | |
432 | * the maxpktsize (WUSB1.0[8.3.3.1])...not really too much of | |
433 | * a check (FIXME) */ | |
434 | maxpktsize = le16_to_cpu(rpipe->descr.wMaxPacketSize); | |
435 | if (xfer->seg_size < maxpktsize) { | |
436 | dev_err(dev, "HW BUG? seg_size %zu smaller than maxpktsize " | |
437 | "%zu\n", xfer->seg_size, maxpktsize); | |
438 | result = -EINVAL; | |
439 | goto error; | |
440 | } | |
441 | xfer->seg_size = (xfer->seg_size / maxpktsize) * maxpktsize; | |
442 | xfer->segs = (urb->transfer_buffer_length + xfer->seg_size - 1) | |
443 | / xfer->seg_size; | |
444 | if (xfer->segs >= WA_SEGS_MAX) { | |
445 | dev_err(dev, "BUG? ops, number of segments %d bigger than %d\n", | |
446 | (int)(urb->transfer_buffer_length / xfer->seg_size), | |
447 | WA_SEGS_MAX); | |
448 | result = -EINVAL; | |
449 | goto error; | |
450 | } | |
451 | if (xfer->segs == 0 && *pxfer_type == WA_XFER_TYPE_CTL) | |
452 | xfer->segs = 1; | |
453 | error: | |
df365423 IPG |
454 | return result; |
455 | } | |
456 | ||
bce83697 | 457 | /* Fill in the common request header and xfer-type specific data. */ |
df365423 IPG |
458 | static void __wa_xfer_setup_hdr0(struct wa_xfer *xfer, |
459 | struct wa_xfer_hdr *xfer_hdr0, | |
460 | enum wa_xfer_type xfer_type, | |
461 | size_t xfer_hdr_size) | |
462 | { | |
463 | struct wa_rpipe *rpipe = xfer->ep->hcpriv; | |
464 | ||
465 | xfer_hdr0 = &xfer->seg[0]->xfer_hdr; | |
466 | xfer_hdr0->bLength = xfer_hdr_size; | |
467 | xfer_hdr0->bRequestType = xfer_type; | |
468 | xfer_hdr0->wRPipe = rpipe->descr.wRPipeIndex; | |
469 | xfer_hdr0->dwTransferID = wa_xfer_id(xfer); | |
470 | xfer_hdr0->bTransferSegment = 0; | |
471 | switch (xfer_type) { | |
472 | case WA_XFER_TYPE_CTL: { | |
473 | struct wa_xfer_ctl *xfer_ctl = | |
474 | container_of(xfer_hdr0, struct wa_xfer_ctl, hdr); | |
475 | xfer_ctl->bmAttribute = xfer->is_inbound ? 1 : 0; | |
476 | BUG_ON(xfer->urb->transfer_flags & URB_NO_SETUP_DMA_MAP | |
477 | && xfer->urb->setup_packet == NULL); | |
478 | memcpy(&xfer_ctl->baSetupData, xfer->urb->setup_packet, | |
479 | sizeof(xfer_ctl->baSetupData)); | |
480 | break; | |
481 | } | |
482 | case WA_XFER_TYPE_BI: | |
483 | break; | |
484 | case WA_XFER_TYPE_ISO: | |
485 | printk(KERN_ERR "FIXME: ISOC not implemented\n"); | |
486 | default: | |
487 | BUG(); | |
488 | }; | |
489 | } | |
490 | ||
491 | /* | |
492 | * Callback for the OUT data phase of the segment request | |
493 | * | |
494 | * Check wa_seg_cb(); most comments also apply here because this | |
495 | * function does almost the same thing and they work closely | |
496 | * together. | |
497 | * | |
498 | * If the seg request has failed but this DTO phase has suceeded, | |
499 | * wa_seg_cb() has already failed the segment and moved the | |
500 | * status to WA_SEG_ERROR, so this will go through 'case 0' and | |
501 | * effectively do nothing. | |
502 | */ | |
503 | static void wa_seg_dto_cb(struct urb *urb) | |
504 | { | |
505 | struct wa_seg *seg = urb->context; | |
506 | struct wa_xfer *xfer = seg->xfer; | |
507 | struct wahc *wa; | |
508 | struct device *dev; | |
509 | struct wa_rpipe *rpipe; | |
510 | unsigned long flags; | |
511 | unsigned rpipe_ready = 0; | |
512 | u8 done = 0; | |
513 | ||
df365423 IPG |
514 | switch (urb->status) { |
515 | case 0: | |
516 | spin_lock_irqsave(&xfer->lock, flags); | |
517 | wa = xfer->wa; | |
518 | dev = &wa->usb_iface->dev; | |
bce83697 DV |
519 | dev_dbg(dev, "xfer %p#%u: data out done (%d bytes)\n", |
520 | xfer, seg->index, urb->actual_length); | |
df365423 IPG |
521 | if (seg->status < WA_SEG_PENDING) |
522 | seg->status = WA_SEG_PENDING; | |
523 | seg->result = urb->actual_length; | |
524 | spin_unlock_irqrestore(&xfer->lock, flags); | |
525 | break; | |
526 | case -ECONNRESET: /* URB unlinked; no need to do anything */ | |
527 | case -ENOENT: /* as it was done by the who unlinked us */ | |
528 | break; | |
529 | default: /* Other errors ... */ | |
530 | spin_lock_irqsave(&xfer->lock, flags); | |
531 | wa = xfer->wa; | |
532 | dev = &wa->usb_iface->dev; | |
533 | rpipe = xfer->ep->hcpriv; | |
bce83697 DV |
534 | dev_dbg(dev, "xfer %p#%u: data out error %d\n", |
535 | xfer, seg->index, urb->status); | |
df365423 IPG |
536 | if (edc_inc(&wa->nep_edc, EDC_MAX_ERRORS, |
537 | EDC_ERROR_TIMEFRAME)){ | |
538 | dev_err(dev, "DTO: URB max acceptable errors " | |
539 | "exceeded, resetting device\n"); | |
540 | wa_reset_all(wa); | |
541 | } | |
542 | if (seg->status != WA_SEG_ERROR) { | |
543 | seg->status = WA_SEG_ERROR; | |
544 | seg->result = urb->status; | |
545 | xfer->segs_done++; | |
546 | __wa_xfer_abort(xfer); | |
547 | rpipe_ready = rpipe_avail_inc(rpipe); | |
548 | done = __wa_xfer_is_done(xfer); | |
549 | } | |
550 | spin_unlock_irqrestore(&xfer->lock, flags); | |
551 | if (done) | |
552 | wa_xfer_completion(xfer); | |
553 | if (rpipe_ready) | |
554 | wa_xfer_delayed_run(rpipe); | |
555 | } | |
df365423 IPG |
556 | } |
557 | ||
558 | /* | |
559 | * Callback for the segment request | |
560 | * | |
af901ca1 | 561 | * If successful transition state (unless already transitioned or |
df365423 IPG |
562 | * outbound transfer); otherwise, take a note of the error, mark this |
563 | * segment done and try completion. | |
564 | * | |
565 | * Note we don't access until we are sure that the transfer hasn't | |
566 | * been cancelled (ECONNRESET, ENOENT), which could mean that | |
567 | * seg->xfer could be already gone. | |
568 | * | |
569 | * We have to check before setting the status to WA_SEG_PENDING | |
570 | * because sometimes the xfer result callback arrives before this | |
571 | * callback (geeeeeeze), so it might happen that we are already in | |
572 | * another state. As well, we don't set it if the transfer is inbound, | |
573 | * as in that case, wa_seg_dto_cb will do it when the OUT data phase | |
574 | * finishes. | |
575 | */ | |
576 | static void wa_seg_cb(struct urb *urb) | |
577 | { | |
578 | struct wa_seg *seg = urb->context; | |
579 | struct wa_xfer *xfer = seg->xfer; | |
580 | struct wahc *wa; | |
581 | struct device *dev; | |
582 | struct wa_rpipe *rpipe; | |
583 | unsigned long flags; | |
584 | unsigned rpipe_ready; | |
585 | u8 done = 0; | |
586 | ||
df365423 IPG |
587 | switch (urb->status) { |
588 | case 0: | |
589 | spin_lock_irqsave(&xfer->lock, flags); | |
590 | wa = xfer->wa; | |
591 | dev = &wa->usb_iface->dev; | |
bce83697 | 592 | dev_dbg(dev, "xfer %p#%u: request done\n", xfer, seg->index); |
df365423 IPG |
593 | if (xfer->is_inbound && seg->status < WA_SEG_PENDING) |
594 | seg->status = WA_SEG_PENDING; | |
595 | spin_unlock_irqrestore(&xfer->lock, flags); | |
596 | break; | |
597 | case -ECONNRESET: /* URB unlinked; no need to do anything */ | |
598 | case -ENOENT: /* as it was done by the who unlinked us */ | |
599 | break; | |
600 | default: /* Other errors ... */ | |
601 | spin_lock_irqsave(&xfer->lock, flags); | |
602 | wa = xfer->wa; | |
603 | dev = &wa->usb_iface->dev; | |
604 | rpipe = xfer->ep->hcpriv; | |
605 | if (printk_ratelimit()) | |
606 | dev_err(dev, "xfer %p#%u: request error %d\n", | |
607 | xfer, seg->index, urb->status); | |
608 | if (edc_inc(&wa->nep_edc, EDC_MAX_ERRORS, | |
609 | EDC_ERROR_TIMEFRAME)){ | |
610 | dev_err(dev, "DTO: URB max acceptable errors " | |
611 | "exceeded, resetting device\n"); | |
612 | wa_reset_all(wa); | |
613 | } | |
614 | usb_unlink_urb(seg->dto_urb); | |
615 | seg->status = WA_SEG_ERROR; | |
616 | seg->result = urb->status; | |
617 | xfer->segs_done++; | |
618 | __wa_xfer_abort(xfer); | |
619 | rpipe_ready = rpipe_avail_inc(rpipe); | |
620 | done = __wa_xfer_is_done(xfer); | |
621 | spin_unlock_irqrestore(&xfer->lock, flags); | |
622 | if (done) | |
623 | wa_xfer_completion(xfer); | |
624 | if (rpipe_ready) | |
625 | wa_xfer_delayed_run(rpipe); | |
626 | } | |
df365423 IPG |
627 | } |
628 | ||
629 | /* | |
630 | * Allocate the segs array and initialize each of them | |
631 | * | |
632 | * The segments are freed by wa_xfer_destroy() when the xfer use count | |
633 | * drops to zero; however, because each segment is given the same life | |
634 | * cycle as the USB URB it contains, it is actually freed by | |
635 | * usb_put_urb() on the contained USB URB (twisted, eh?). | |
636 | */ | |
637 | static int __wa_xfer_setup_segs(struct wa_xfer *xfer, size_t xfer_hdr_size) | |
638 | { | |
639 | int result, cnt; | |
640 | size_t alloc_size = sizeof(*xfer->seg[0]) | |
641 | - sizeof(xfer->seg[0]->xfer_hdr) + xfer_hdr_size; | |
642 | struct usb_device *usb_dev = xfer->wa->usb_dev; | |
643 | const struct usb_endpoint_descriptor *dto_epd = xfer->wa->dto_epd; | |
644 | struct wa_seg *seg; | |
645 | size_t buf_itr, buf_size, buf_itr_size; | |
646 | ||
647 | result = -ENOMEM; | |
92c4d9bd | 648 | xfer->seg = kcalloc(xfer->segs, sizeof(xfer->seg[0]), GFP_ATOMIC); |
df365423 IPG |
649 | if (xfer->seg == NULL) |
650 | goto error_segs_kzalloc; | |
651 | buf_itr = 0; | |
652 | buf_size = xfer->urb->transfer_buffer_length; | |
653 | for (cnt = 0; cnt < xfer->segs; cnt++) { | |
654 | seg = xfer->seg[cnt] = kzalloc(alloc_size, GFP_ATOMIC); | |
655 | if (seg == NULL) | |
656 | goto error_seg_kzalloc; | |
657 | wa_seg_init(seg); | |
658 | seg->xfer = xfer; | |
659 | seg->index = cnt; | |
660 | usb_fill_bulk_urb(&seg->urb, usb_dev, | |
661 | usb_sndbulkpipe(usb_dev, | |
662 | dto_epd->bEndpointAddress), | |
663 | &seg->xfer_hdr, xfer_hdr_size, | |
664 | wa_seg_cb, seg); | |
665 | buf_itr_size = buf_size > xfer->seg_size ? | |
666 | xfer->seg_size : buf_size; | |
667 | if (xfer->is_inbound == 0 && buf_size > 0) { | |
668 | seg->dto_urb = usb_alloc_urb(0, GFP_ATOMIC); | |
669 | if (seg->dto_urb == NULL) | |
670 | goto error_dto_alloc; | |
671 | usb_fill_bulk_urb( | |
672 | seg->dto_urb, usb_dev, | |
673 | usb_sndbulkpipe(usb_dev, | |
674 | dto_epd->bEndpointAddress), | |
675 | NULL, 0, wa_seg_dto_cb, seg); | |
676 | if (xfer->is_dma) { | |
677 | seg->dto_urb->transfer_dma = | |
678 | xfer->urb->transfer_dma + buf_itr; | |
679 | seg->dto_urb->transfer_flags |= | |
680 | URB_NO_TRANSFER_DMA_MAP; | |
681 | } else | |
682 | seg->dto_urb->transfer_buffer = | |
683 | xfer->urb->transfer_buffer + buf_itr; | |
684 | seg->dto_urb->transfer_buffer_length = buf_itr_size; | |
685 | } | |
686 | seg->status = WA_SEG_READY; | |
687 | buf_itr += buf_itr_size; | |
688 | buf_size -= buf_itr_size; | |
689 | } | |
690 | return 0; | |
691 | ||
692 | error_dto_alloc: | |
693 | kfree(xfer->seg[cnt]); | |
694 | cnt--; | |
695 | error_seg_kzalloc: | |
696 | /* use the fact that cnt is left at were it failed */ | |
697 | for (; cnt > 0; cnt--) { | |
698 | if (xfer->is_inbound == 0) | |
699 | kfree(xfer->seg[cnt]->dto_urb); | |
700 | kfree(xfer->seg[cnt]); | |
701 | } | |
702 | error_segs_kzalloc: | |
703 | return result; | |
704 | } | |
705 | ||
706 | /* | |
707 | * Allocates all the stuff needed to submit a transfer | |
708 | * | |
709 | * Breaks the whole data buffer in a list of segments, each one has a | |
710 | * structure allocated to it and linked in xfer->seg[index] | |
711 | * | |
712 | * FIXME: merge setup_segs() and the last part of this function, no | |
713 | * need to do two for loops when we could run everything in a | |
714 | * single one | |
715 | */ | |
716 | static int __wa_xfer_setup(struct wa_xfer *xfer, struct urb *urb) | |
717 | { | |
718 | int result; | |
719 | struct device *dev = &xfer->wa->usb_iface->dev; | |
720 | enum wa_xfer_type xfer_type = 0; /* shut up GCC */ | |
721 | size_t xfer_hdr_size, cnt, transfer_size; | |
722 | struct wa_xfer_hdr *xfer_hdr0, *xfer_hdr; | |
723 | ||
df365423 IPG |
724 | result = __wa_xfer_setup_sizes(xfer, &xfer_type); |
725 | if (result < 0) | |
726 | goto error_setup_sizes; | |
727 | xfer_hdr_size = result; | |
728 | result = __wa_xfer_setup_segs(xfer, xfer_hdr_size); | |
729 | if (result < 0) { | |
730 | dev_err(dev, "xfer %p: Failed to allocate %d segments: %d\n", | |
731 | xfer, xfer->segs, result); | |
732 | goto error_setup_segs; | |
733 | } | |
734 | /* Fill the first header */ | |
735 | xfer_hdr0 = &xfer->seg[0]->xfer_hdr; | |
736 | wa_xfer_id_init(xfer); | |
737 | __wa_xfer_setup_hdr0(xfer, xfer_hdr0, xfer_type, xfer_hdr_size); | |
738 | ||
739 | /* Fill remainig headers */ | |
740 | xfer_hdr = xfer_hdr0; | |
741 | transfer_size = urb->transfer_buffer_length; | |
742 | xfer_hdr0->dwTransferLength = transfer_size > xfer->seg_size ? | |
743 | xfer->seg_size : transfer_size; | |
744 | transfer_size -= xfer->seg_size; | |
745 | for (cnt = 1; cnt < xfer->segs; cnt++) { | |
746 | xfer_hdr = &xfer->seg[cnt]->xfer_hdr; | |
747 | memcpy(xfer_hdr, xfer_hdr0, xfer_hdr_size); | |
748 | xfer_hdr->bTransferSegment = cnt; | |
749 | xfer_hdr->dwTransferLength = transfer_size > xfer->seg_size ? | |
750 | cpu_to_le32(xfer->seg_size) | |
751 | : cpu_to_le32(transfer_size); | |
752 | xfer->seg[cnt]->status = WA_SEG_READY; | |
753 | transfer_size -= xfer->seg_size; | |
754 | } | |
755 | xfer_hdr->bTransferSegment |= 0x80; /* this is the last segment */ | |
756 | result = 0; | |
757 | error_setup_segs: | |
758 | error_setup_sizes: | |
df365423 IPG |
759 | return result; |
760 | } | |
761 | ||
762 | /* | |
763 | * | |
764 | * | |
765 | * rpipe->seg_lock is held! | |
766 | */ | |
767 | static int __wa_seg_submit(struct wa_rpipe *rpipe, struct wa_xfer *xfer, | |
768 | struct wa_seg *seg) | |
769 | { | |
770 | int result; | |
771 | result = usb_submit_urb(&seg->urb, GFP_ATOMIC); | |
772 | if (result < 0) { | |
773 | printk(KERN_ERR "xfer %p#%u: REQ submit failed: %d\n", | |
774 | xfer, seg->index, result); | |
775 | goto error_seg_submit; | |
776 | } | |
777 | if (seg->dto_urb) { | |
778 | result = usb_submit_urb(seg->dto_urb, GFP_ATOMIC); | |
779 | if (result < 0) { | |
780 | printk(KERN_ERR "xfer %p#%u: DTO submit failed: %d\n", | |
781 | xfer, seg->index, result); | |
782 | goto error_dto_submit; | |
783 | } | |
784 | } | |
785 | seg->status = WA_SEG_SUBMITTED; | |
786 | rpipe_avail_dec(rpipe); | |
787 | return 0; | |
788 | ||
789 | error_dto_submit: | |
790 | usb_unlink_urb(&seg->urb); | |
791 | error_seg_submit: | |
792 | seg->status = WA_SEG_ERROR; | |
793 | seg->result = result; | |
794 | return result; | |
795 | } | |
796 | ||
797 | /* | |
798 | * Execute more queued request segments until the maximum concurrent allowed | |
799 | * | |
800 | * The ugly unlock/lock sequence on the error path is needed as the | |
801 | * xfer->lock normally nests the seg_lock and not viceversa. | |
802 | * | |
803 | */ | |
804 | static void wa_xfer_delayed_run(struct wa_rpipe *rpipe) | |
805 | { | |
806 | int result; | |
807 | struct device *dev = &rpipe->wa->usb_iface->dev; | |
808 | struct wa_seg *seg; | |
809 | struct wa_xfer *xfer; | |
810 | unsigned long flags; | |
811 | ||
df365423 IPG |
812 | spin_lock_irqsave(&rpipe->seg_lock, flags); |
813 | while (atomic_read(&rpipe->segs_available) > 0 | |
814 | && !list_empty(&rpipe->seg_list)) { | |
815 | seg = list_entry(rpipe->seg_list.next, struct wa_seg, | |
816 | list_node); | |
817 | list_del(&seg->list_node); | |
818 | xfer = seg->xfer; | |
819 | result = __wa_seg_submit(rpipe, xfer, seg); | |
bce83697 DV |
820 | dev_dbg(dev, "xfer %p#%u submitted from delayed [%d segments available] %d\n", |
821 | xfer, seg->index, atomic_read(&rpipe->segs_available), result); | |
df365423 IPG |
822 | if (unlikely(result < 0)) { |
823 | spin_unlock_irqrestore(&rpipe->seg_lock, flags); | |
824 | spin_lock_irqsave(&xfer->lock, flags); | |
825 | __wa_xfer_abort(xfer); | |
826 | xfer->segs_done++; | |
827 | spin_unlock_irqrestore(&xfer->lock, flags); | |
828 | spin_lock_irqsave(&rpipe->seg_lock, flags); | |
829 | } | |
830 | } | |
831 | spin_unlock_irqrestore(&rpipe->seg_lock, flags); | |
df365423 IPG |
832 | } |
833 | ||
834 | /* | |
835 | * | |
836 | * xfer->lock is taken | |
837 | * | |
838 | * On failure submitting we just stop submitting and return error; | |
839 | * wa_urb_enqueue_b() will execute the completion path | |
840 | */ | |
841 | static int __wa_xfer_submit(struct wa_xfer *xfer) | |
842 | { | |
843 | int result; | |
844 | struct wahc *wa = xfer->wa; | |
845 | struct device *dev = &wa->usb_iface->dev; | |
846 | unsigned cnt; | |
847 | struct wa_seg *seg; | |
848 | unsigned long flags; | |
849 | struct wa_rpipe *rpipe = xfer->ep->hcpriv; | |
850 | size_t maxrequests = le16_to_cpu(rpipe->descr.wRequests); | |
851 | u8 available; | |
852 | u8 empty; | |
853 | ||
df365423 IPG |
854 | spin_lock_irqsave(&wa->xfer_list_lock, flags); |
855 | list_add_tail(&xfer->list_node, &wa->xfer_list); | |
856 | spin_unlock_irqrestore(&wa->xfer_list_lock, flags); | |
857 | ||
858 | BUG_ON(atomic_read(&rpipe->segs_available) > maxrequests); | |
859 | result = 0; | |
860 | spin_lock_irqsave(&rpipe->seg_lock, flags); | |
861 | for (cnt = 0; cnt < xfer->segs; cnt++) { | |
862 | available = atomic_read(&rpipe->segs_available); | |
863 | empty = list_empty(&rpipe->seg_list); | |
864 | seg = xfer->seg[cnt]; | |
bce83697 DV |
865 | dev_dbg(dev, "xfer %p#%u: available %u empty %u (%s)\n", |
866 | xfer, cnt, available, empty, | |
867 | available == 0 || !empty ? "delayed" : "submitted"); | |
df365423 | 868 | if (available == 0 || !empty) { |
bce83697 | 869 | dev_dbg(dev, "xfer %p#%u: delayed\n", xfer, cnt); |
df365423 IPG |
870 | seg->status = WA_SEG_DELAYED; |
871 | list_add_tail(&seg->list_node, &rpipe->seg_list); | |
872 | } else { | |
873 | result = __wa_seg_submit(rpipe, xfer, seg); | |
bce83697 DV |
874 | if (result < 0) { |
875 | __wa_xfer_abort(xfer); | |
df365423 | 876 | goto error_seg_submit; |
bce83697 | 877 | } |
df365423 IPG |
878 | } |
879 | xfer->segs_submitted++; | |
880 | } | |
df365423 | 881 | error_seg_submit: |
df365423 | 882 | spin_unlock_irqrestore(&rpipe->seg_lock, flags); |
df365423 IPG |
883 | return result; |
884 | } | |
885 | ||
886 | /* | |
887 | * Second part of a URB/transfer enqueuement | |
888 | * | |
889 | * Assumes this comes from wa_urb_enqueue() [maybe through | |
890 | * wa_urb_enqueue_run()]. At this point: | |
891 | * | |
892 | * xfer->wa filled and refcounted | |
893 | * xfer->ep filled with rpipe refcounted if | |
894 | * delayed == 0 | |
895 | * xfer->urb filled and refcounted (this is the case when called | |
896 | * from wa_urb_enqueue() as we come from usb_submit_urb() | |
897 | * and when called by wa_urb_enqueue_run(), as we took an | |
898 | * extra ref dropped by _run() after we return). | |
899 | * xfer->gfp filled | |
900 | * | |
901 | * If we fail at __wa_xfer_submit(), then we just check if we are done | |
902 | * and if so, we run the completion procedure. However, if we are not | |
903 | * yet done, we do nothing and wait for the completion handlers from | |
904 | * the submitted URBs or from the xfer-result path to kick in. If xfer | |
905 | * result never kicks in, the xfer will timeout from the USB code and | |
906 | * dequeue() will be called. | |
907 | */ | |
908 | static void wa_urb_enqueue_b(struct wa_xfer *xfer) | |
909 | { | |
910 | int result; | |
911 | unsigned long flags; | |
912 | struct urb *urb = xfer->urb; | |
913 | struct wahc *wa = xfer->wa; | |
914 | struct wusbhc *wusbhc = wa->wusb; | |
df365423 IPG |
915 | struct wusb_dev *wusb_dev; |
916 | unsigned done; | |
917 | ||
df365423 IPG |
918 | result = rpipe_get_by_ep(wa, xfer->ep, urb, xfer->gfp); |
919 | if (result < 0) | |
920 | goto error_rpipe_get; | |
921 | result = -ENODEV; | |
922 | /* FIXME: segmentation broken -- kills DWA */ | |
923 | mutex_lock(&wusbhc->mutex); /* get a WUSB dev */ | |
49fa0921 JS |
924 | if (urb->dev == NULL) { |
925 | mutex_unlock(&wusbhc->mutex); | |
df365423 | 926 | goto error_dev_gone; |
49fa0921 | 927 | } |
df365423 IPG |
928 | wusb_dev = __wusb_dev_get_by_usb_dev(wusbhc, urb->dev); |
929 | if (wusb_dev == NULL) { | |
930 | mutex_unlock(&wusbhc->mutex); | |
931 | goto error_dev_gone; | |
932 | } | |
933 | mutex_unlock(&wusbhc->mutex); | |
934 | ||
935 | spin_lock_irqsave(&xfer->lock, flags); | |
936 | xfer->wusb_dev = wusb_dev; | |
937 | result = urb->status; | |
938 | if (urb->status != -EINPROGRESS) | |
939 | goto error_dequeued; | |
940 | ||
941 | result = __wa_xfer_setup(xfer, urb); | |
942 | if (result < 0) | |
943 | goto error_xfer_setup; | |
944 | result = __wa_xfer_submit(xfer); | |
945 | if (result < 0) | |
946 | goto error_xfer_submit; | |
947 | spin_unlock_irqrestore(&xfer->lock, flags); | |
df365423 IPG |
948 | return; |
949 | ||
950 | /* this is basically wa_xfer_completion() broken up wa_xfer_giveback() | |
951 | * does a wa_xfer_put() that will call wa_xfer_destroy() and clean | |
952 | * upundo setup(). | |
953 | */ | |
954 | error_xfer_setup: | |
955 | error_dequeued: | |
956 | spin_unlock_irqrestore(&xfer->lock, flags); | |
957 | /* FIXME: segmentation broken, kills DWA */ | |
958 | if (wusb_dev) | |
959 | wusb_dev_put(wusb_dev); | |
960 | error_dev_gone: | |
961 | rpipe_put(xfer->ep->hcpriv); | |
962 | error_rpipe_get: | |
963 | xfer->result = result; | |
964 | wa_xfer_giveback(xfer); | |
df365423 IPG |
965 | return; |
966 | ||
967 | error_xfer_submit: | |
968 | done = __wa_xfer_is_done(xfer); | |
969 | xfer->result = result; | |
970 | spin_unlock_irqrestore(&xfer->lock, flags); | |
971 | if (done) | |
972 | wa_xfer_completion(xfer); | |
df365423 IPG |
973 | } |
974 | ||
975 | /* | |
976 | * Execute the delayed transfers in the Wire Adapter @wa | |
977 | * | |
978 | * We need to be careful here, as dequeue() could be called in the | |
979 | * middle. That's why we do the whole thing under the | |
980 | * wa->xfer_list_lock. If dequeue() jumps in, it first locks urb->lock | |
981 | * and then checks the list -- so as we would be acquiring in inverse | |
982 | * order, we just drop the lock once we have the xfer and reacquire it | |
983 | * later. | |
984 | */ | |
985 | void wa_urb_enqueue_run(struct work_struct *ws) | |
986 | { | |
987 | struct wahc *wa = container_of(ws, struct wahc, xfer_work); | |
df365423 IPG |
988 | struct wa_xfer *xfer, *next; |
989 | struct urb *urb; | |
990 | ||
df365423 IPG |
991 | spin_lock_irq(&wa->xfer_list_lock); |
992 | list_for_each_entry_safe(xfer, next, &wa->xfer_delayed_list, | |
993 | list_node) { | |
994 | list_del_init(&xfer->list_node); | |
995 | spin_unlock_irq(&wa->xfer_list_lock); | |
996 | ||
997 | urb = xfer->urb; | |
998 | wa_urb_enqueue_b(xfer); | |
999 | usb_put_urb(urb); /* taken when queuing */ | |
1000 | ||
1001 | spin_lock_irq(&wa->xfer_list_lock); | |
1002 | } | |
1003 | spin_unlock_irq(&wa->xfer_list_lock); | |
df365423 IPG |
1004 | } |
1005 | EXPORT_SYMBOL_GPL(wa_urb_enqueue_run); | |
1006 | ||
1007 | /* | |
1008 | * Submit a transfer to the Wire Adapter in a delayed way | |
1009 | * | |
1010 | * The process of enqueuing involves possible sleeps() [see | |
1011 | * enqueue_b(), for the rpipe_get() and the mutex_lock()]. If we are | |
1012 | * in an atomic section, we defer the enqueue_b() call--else we call direct. | |
1013 | * | |
1014 | * @urb: We own a reference to it done by the HCI Linux USB stack that | |
1015 | * will be given up by calling usb_hcd_giveback_urb() or by | |
1016 | * returning error from this function -> ergo we don't have to | |
1017 | * refcount it. | |
1018 | */ | |
1019 | int wa_urb_enqueue(struct wahc *wa, struct usb_host_endpoint *ep, | |
1020 | struct urb *urb, gfp_t gfp) | |
1021 | { | |
1022 | int result; | |
1023 | struct device *dev = &wa->usb_iface->dev; | |
1024 | struct wa_xfer *xfer; | |
1025 | unsigned long my_flags; | |
1026 | unsigned cant_sleep = irqs_disabled() | in_atomic(); | |
1027 | ||
df365423 IPG |
1028 | if (urb->transfer_buffer == NULL |
1029 | && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) | |
1030 | && urb->transfer_buffer_length != 0) { | |
1031 | dev_err(dev, "BUG? urb %p: NULL xfer buffer & NODMA\n", urb); | |
1032 | dump_stack(); | |
1033 | } | |
1034 | ||
1035 | result = -ENOMEM; | |
1036 | xfer = kzalloc(sizeof(*xfer), gfp); | |
1037 | if (xfer == NULL) | |
1038 | goto error_kmalloc; | |
1039 | ||
1040 | result = -ENOENT; | |
1041 | if (urb->status != -EINPROGRESS) /* cancelled */ | |
1042 | goto error_dequeued; /* before starting? */ | |
1043 | wa_xfer_init(xfer); | |
1044 | xfer->wa = wa_get(wa); | |
1045 | xfer->urb = urb; | |
1046 | xfer->gfp = gfp; | |
1047 | xfer->ep = ep; | |
1048 | urb->hcpriv = xfer; | |
bce83697 DV |
1049 | |
1050 | dev_dbg(dev, "xfer %p urb %p pipe 0x%02x [%d bytes] %s %s %s\n", | |
1051 | xfer, urb, urb->pipe, urb->transfer_buffer_length, | |
1052 | urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP ? "dma" : "nodma", | |
1053 | urb->pipe & USB_DIR_IN ? "inbound" : "outbound", | |
1054 | cant_sleep ? "deferred" : "inline"); | |
1055 | ||
df365423 IPG |
1056 | if (cant_sleep) { |
1057 | usb_get_urb(urb); | |
1058 | spin_lock_irqsave(&wa->xfer_list_lock, my_flags); | |
1059 | list_add_tail(&xfer->list_node, &wa->xfer_delayed_list); | |
1060 | spin_unlock_irqrestore(&wa->xfer_list_lock, my_flags); | |
1061 | queue_work(wusbd, &wa->xfer_work); | |
1062 | } else { | |
1063 | wa_urb_enqueue_b(xfer); | |
1064 | } | |
df365423 IPG |
1065 | return 0; |
1066 | ||
1067 | error_dequeued: | |
1068 | kfree(xfer); | |
1069 | error_kmalloc: | |
df365423 IPG |
1070 | return result; |
1071 | } | |
1072 | EXPORT_SYMBOL_GPL(wa_urb_enqueue); | |
1073 | ||
1074 | /* | |
1075 | * Dequeue a URB and make sure uwb_hcd_giveback_urb() [completion | |
1076 | * handler] is called. | |
1077 | * | |
1078 | * Until a transfer goes successfully through wa_urb_enqueue() it | |
1079 | * needs to be dequeued with completion calling; when stuck in delayed | |
1080 | * or before wa_xfer_setup() is called, we need to do completion. | |
1081 | * | |
1082 | * not setup If there is no hcpriv yet, that means that that enqueue | |
1083 | * still had no time to set the xfer up. Because | |
1084 | * urb->status should be other than -EINPROGRESS, | |
1085 | * enqueue() will catch that and bail out. | |
1086 | * | |
1087 | * If the transfer has gone through setup, we just need to clean it | |
1088 | * up. If it has gone through submit(), we have to abort it [with an | |
1089 | * asynch request] and then make sure we cancel each segment. | |
1090 | * | |
1091 | */ | |
1092 | int wa_urb_dequeue(struct wahc *wa, struct urb *urb) | |
1093 | { | |
df365423 IPG |
1094 | unsigned long flags, flags2; |
1095 | struct wa_xfer *xfer; | |
1096 | struct wa_seg *seg; | |
1097 | struct wa_rpipe *rpipe; | |
1098 | unsigned cnt; | |
1099 | unsigned rpipe_ready = 0; | |
1100 | ||
df365423 IPG |
1101 | xfer = urb->hcpriv; |
1102 | if (xfer == NULL) { | |
1103 | /* NOthing setup yet enqueue will see urb->status != | |
1104 | * -EINPROGRESS (by hcd layer) and bail out with | |
1105 | * error, no need to do completion | |
1106 | */ | |
1107 | BUG_ON(urb->status == -EINPROGRESS); | |
1108 | goto out; | |
1109 | } | |
1110 | spin_lock_irqsave(&xfer->lock, flags); | |
1111 | rpipe = xfer->ep->hcpriv; | |
1112 | /* Check the delayed list -> if there, release and complete */ | |
1113 | spin_lock_irqsave(&wa->xfer_list_lock, flags2); | |
1114 | if (!list_empty(&xfer->list_node) && xfer->seg == NULL) | |
1115 | goto dequeue_delayed; | |
1116 | spin_unlock_irqrestore(&wa->xfer_list_lock, flags2); | |
1117 | if (xfer->seg == NULL) /* still hasn't reached */ | |
1118 | goto out_unlock; /* setup(), enqueue_b() completes */ | |
1119 | /* Ok, the xfer is in flight already, it's been setup and submitted.*/ | |
1120 | __wa_xfer_abort(xfer); | |
1121 | for (cnt = 0; cnt < xfer->segs; cnt++) { | |
1122 | seg = xfer->seg[cnt]; | |
1123 | switch (seg->status) { | |
1124 | case WA_SEG_NOTREADY: | |
1125 | case WA_SEG_READY: | |
1126 | printk(KERN_ERR "xfer %p#%u: dequeue bad state %u\n", | |
1127 | xfer, cnt, seg->status); | |
1128 | WARN_ON(1); | |
1129 | break; | |
1130 | case WA_SEG_DELAYED: | |
1131 | seg->status = WA_SEG_ABORTED; | |
1132 | spin_lock_irqsave(&rpipe->seg_lock, flags2); | |
1133 | list_del(&seg->list_node); | |
1134 | xfer->segs_done++; | |
1135 | rpipe_ready = rpipe_avail_inc(rpipe); | |
1136 | spin_unlock_irqrestore(&rpipe->seg_lock, flags2); | |
1137 | break; | |
1138 | case WA_SEG_SUBMITTED: | |
1139 | seg->status = WA_SEG_ABORTED; | |
1140 | usb_unlink_urb(&seg->urb); | |
1141 | if (xfer->is_inbound == 0) | |
1142 | usb_unlink_urb(seg->dto_urb); | |
1143 | xfer->segs_done++; | |
1144 | rpipe_ready = rpipe_avail_inc(rpipe); | |
1145 | break; | |
1146 | case WA_SEG_PENDING: | |
1147 | seg->status = WA_SEG_ABORTED; | |
1148 | xfer->segs_done++; | |
1149 | rpipe_ready = rpipe_avail_inc(rpipe); | |
1150 | break; | |
1151 | case WA_SEG_DTI_PENDING: | |
1152 | usb_unlink_urb(wa->dti_urb); | |
1153 | seg->status = WA_SEG_ABORTED; | |
1154 | xfer->segs_done++; | |
1155 | rpipe_ready = rpipe_avail_inc(rpipe); | |
1156 | break; | |
1157 | case WA_SEG_DONE: | |
1158 | case WA_SEG_ERROR: | |
1159 | case WA_SEG_ABORTED: | |
1160 | break; | |
1161 | } | |
1162 | } | |
1163 | xfer->result = urb->status; /* -ENOENT or -ECONNRESET */ | |
1164 | __wa_xfer_is_done(xfer); | |
1165 | spin_unlock_irqrestore(&xfer->lock, flags); | |
1166 | wa_xfer_completion(xfer); | |
1167 | if (rpipe_ready) | |
1168 | wa_xfer_delayed_run(rpipe); | |
df365423 IPG |
1169 | return 0; |
1170 | ||
1171 | out_unlock: | |
1172 | spin_unlock_irqrestore(&xfer->lock, flags); | |
1173 | out: | |
df365423 IPG |
1174 | return 0; |
1175 | ||
1176 | dequeue_delayed: | |
1177 | list_del_init(&xfer->list_node); | |
1178 | spin_unlock_irqrestore(&wa->xfer_list_lock, flags2); | |
1179 | xfer->result = urb->status; | |
1180 | spin_unlock_irqrestore(&xfer->lock, flags); | |
1181 | wa_xfer_giveback(xfer); | |
1182 | usb_put_urb(urb); /* we got a ref in enqueue() */ | |
df365423 IPG |
1183 | return 0; |
1184 | } | |
1185 | EXPORT_SYMBOL_GPL(wa_urb_dequeue); | |
1186 | ||
1187 | /* | |
1188 | * Translation from WA status codes (WUSB1.0 Table 8.15) to errno | |
1189 | * codes | |
1190 | * | |
1191 | * Positive errno values are internal inconsistencies and should be | |
1192 | * flagged louder. Negative are to be passed up to the user in the | |
1193 | * normal way. | |
1194 | * | |
1195 | * @status: USB WA status code -- high two bits are stripped. | |
1196 | */ | |
1197 | static int wa_xfer_status_to_errno(u8 status) | |
1198 | { | |
1199 | int errno; | |
1200 | u8 real_status = status; | |
1201 | static int xlat[] = { | |
1202 | [WA_XFER_STATUS_SUCCESS] = 0, | |
1203 | [WA_XFER_STATUS_HALTED] = -EPIPE, | |
1204 | [WA_XFER_STATUS_DATA_BUFFER_ERROR] = -ENOBUFS, | |
1205 | [WA_XFER_STATUS_BABBLE] = -EOVERFLOW, | |
1206 | [WA_XFER_RESERVED] = EINVAL, | |
1207 | [WA_XFER_STATUS_NOT_FOUND] = 0, | |
1208 | [WA_XFER_STATUS_INSUFFICIENT_RESOURCE] = -ENOMEM, | |
1209 | [WA_XFER_STATUS_TRANSACTION_ERROR] = -EILSEQ, | |
1210 | [WA_XFER_STATUS_ABORTED] = -EINTR, | |
1211 | [WA_XFER_STATUS_RPIPE_NOT_READY] = EINVAL, | |
1212 | [WA_XFER_INVALID_FORMAT] = EINVAL, | |
1213 | [WA_XFER_UNEXPECTED_SEGMENT_NUMBER] = EINVAL, | |
1214 | [WA_XFER_STATUS_RPIPE_TYPE_MISMATCH] = EINVAL, | |
1215 | }; | |
1216 | status &= 0x3f; | |
1217 | ||
1218 | if (status == 0) | |
1219 | return 0; | |
1220 | if (status >= ARRAY_SIZE(xlat)) { | |
1221 | if (printk_ratelimit()) | |
1222 | printk(KERN_ERR "%s(): BUG? " | |
1223 | "Unknown WA transfer status 0x%02x\n", | |
1224 | __func__, real_status); | |
1225 | return -EINVAL; | |
1226 | } | |
1227 | errno = xlat[status]; | |
1228 | if (unlikely(errno > 0)) { | |
1229 | if (printk_ratelimit()) | |
1230 | printk(KERN_ERR "%s(): BUG? " | |
1231 | "Inconsistent WA status: 0x%02x\n", | |
1232 | __func__, real_status); | |
1233 | errno = -errno; | |
1234 | } | |
1235 | return errno; | |
1236 | } | |
1237 | ||
1238 | /* | |
1239 | * Process a xfer result completion message | |
1240 | * | |
1241 | * inbound transfers: need to schedule a DTI read | |
1242 | * | |
1243 | * FIXME: this functio needs to be broken up in parts | |
1244 | */ | |
1245 | static void wa_xfer_result_chew(struct wahc *wa, struct wa_xfer *xfer) | |
1246 | { | |
1247 | int result; | |
1248 | struct device *dev = &wa->usb_iface->dev; | |
1249 | unsigned long flags; | |
1250 | u8 seg_idx; | |
1251 | struct wa_seg *seg; | |
1252 | struct wa_rpipe *rpipe; | |
1253 | struct wa_xfer_result *xfer_result = wa->xfer_result; | |
1254 | u8 done = 0; | |
1255 | u8 usb_status; | |
1256 | unsigned rpipe_ready = 0; | |
1257 | ||
df365423 IPG |
1258 | spin_lock_irqsave(&xfer->lock, flags); |
1259 | seg_idx = xfer_result->bTransferSegment & 0x7f; | |
1260 | if (unlikely(seg_idx >= xfer->segs)) | |
1261 | goto error_bad_seg; | |
1262 | seg = xfer->seg[seg_idx]; | |
1263 | rpipe = xfer->ep->hcpriv; | |
1264 | usb_status = xfer_result->bTransferStatus; | |
bce83697 DV |
1265 | dev_dbg(dev, "xfer %p#%u: bTransferStatus 0x%02x (seg %u)\n", |
1266 | xfer, seg_idx, usb_status, seg->status); | |
df365423 IPG |
1267 | if (seg->status == WA_SEG_ABORTED |
1268 | || seg->status == WA_SEG_ERROR) /* already handled */ | |
1269 | goto segment_aborted; | |
1270 | if (seg->status == WA_SEG_SUBMITTED) /* ops, got here */ | |
1271 | seg->status = WA_SEG_PENDING; /* before wa_seg{_dto}_cb() */ | |
1272 | if (seg->status != WA_SEG_PENDING) { | |
1273 | if (printk_ratelimit()) | |
1274 | dev_err(dev, "xfer %p#%u: Bad segment state %u\n", | |
1275 | xfer, seg_idx, seg->status); | |
1276 | seg->status = WA_SEG_PENDING; /* workaround/"fix" it */ | |
1277 | } | |
1278 | if (usb_status & 0x80) { | |
1279 | seg->result = wa_xfer_status_to_errno(usb_status); | |
1280 | dev_err(dev, "DTI: xfer %p#%u failed (0x%02x)\n", | |
1281 | xfer, seg->index, usb_status); | |
1282 | goto error_complete; | |
1283 | } | |
1284 | /* FIXME: we ignore warnings, tally them for stats */ | |
1285 | if (usb_status & 0x40) /* Warning?... */ | |
1286 | usb_status = 0; /* ... pass */ | |
1287 | if (xfer->is_inbound) { /* IN data phase: read to buffer */ | |
1288 | seg->status = WA_SEG_DTI_PENDING; | |
1289 | BUG_ON(wa->buf_in_urb->status == -EINPROGRESS); | |
1290 | if (xfer->is_dma) { | |
1291 | wa->buf_in_urb->transfer_dma = | |
1292 | xfer->urb->transfer_dma | |
1293 | + seg_idx * xfer->seg_size; | |
1294 | wa->buf_in_urb->transfer_flags | |
1295 | |= URB_NO_TRANSFER_DMA_MAP; | |
1296 | } else { | |
1297 | wa->buf_in_urb->transfer_buffer = | |
1298 | xfer->urb->transfer_buffer | |
1299 | + seg_idx * xfer->seg_size; | |
1300 | wa->buf_in_urb->transfer_flags | |
1301 | &= ~URB_NO_TRANSFER_DMA_MAP; | |
1302 | } | |
1303 | wa->buf_in_urb->transfer_buffer_length = | |
1304 | le32_to_cpu(xfer_result->dwTransferLength); | |
1305 | wa->buf_in_urb->context = seg; | |
1306 | result = usb_submit_urb(wa->buf_in_urb, GFP_ATOMIC); | |
1307 | if (result < 0) | |
1308 | goto error_submit_buf_in; | |
1309 | } else { | |
1310 | /* OUT data phase, complete it -- */ | |
1311 | seg->status = WA_SEG_DONE; | |
1312 | seg->result = le32_to_cpu(xfer_result->dwTransferLength); | |
1313 | xfer->segs_done++; | |
1314 | rpipe_ready = rpipe_avail_inc(rpipe); | |
1315 | done = __wa_xfer_is_done(xfer); | |
1316 | } | |
1317 | spin_unlock_irqrestore(&xfer->lock, flags); | |
1318 | if (done) | |
1319 | wa_xfer_completion(xfer); | |
1320 | if (rpipe_ready) | |
1321 | wa_xfer_delayed_run(rpipe); | |
df365423 IPG |
1322 | return; |
1323 | ||
df365423 IPG |
1324 | error_submit_buf_in: |
1325 | if (edc_inc(&wa->dti_edc, EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME)) { | |
1326 | dev_err(dev, "DTI: URB max acceptable errors " | |
1327 | "exceeded, resetting device\n"); | |
1328 | wa_reset_all(wa); | |
1329 | } | |
1330 | if (printk_ratelimit()) | |
1331 | dev_err(dev, "xfer %p#%u: can't submit DTI data phase: %d\n", | |
1332 | xfer, seg_idx, result); | |
1333 | seg->result = result; | |
1334 | error_complete: | |
1335 | seg->status = WA_SEG_ERROR; | |
1336 | xfer->segs_done++; | |
1337 | rpipe_ready = rpipe_avail_inc(rpipe); | |
1338 | __wa_xfer_abort(xfer); | |
1339 | done = __wa_xfer_is_done(xfer); | |
1340 | spin_unlock_irqrestore(&xfer->lock, flags); | |
1341 | if (done) | |
1342 | wa_xfer_completion(xfer); | |
1343 | if (rpipe_ready) | |
1344 | wa_xfer_delayed_run(rpipe); | |
df365423 IPG |
1345 | return; |
1346 | ||
df365423 IPG |
1347 | error_bad_seg: |
1348 | spin_unlock_irqrestore(&xfer->lock, flags); | |
1349 | wa_urb_dequeue(wa, xfer->urb); | |
1350 | if (printk_ratelimit()) | |
1351 | dev_err(dev, "xfer %p#%u: bad segment\n", xfer, seg_idx); | |
1352 | if (edc_inc(&wa->dti_edc, EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME)) { | |
1353 | dev_err(dev, "DTI: URB max acceptable errors " | |
1354 | "exceeded, resetting device\n"); | |
1355 | wa_reset_all(wa); | |
1356 | } | |
df365423 IPG |
1357 | return; |
1358 | ||
df365423 IPG |
1359 | segment_aborted: |
1360 | /* nothing to do, as the aborter did the completion */ | |
1361 | spin_unlock_irqrestore(&xfer->lock, flags); | |
df365423 IPG |
1362 | } |
1363 | ||
1364 | /* | |
1365 | * Callback for the IN data phase | |
1366 | * | |
af901ca1 | 1367 | * If successful transition state; otherwise, take a note of the |
df365423 IPG |
1368 | * error, mark this segment done and try completion. |
1369 | * | |
1370 | * Note we don't access until we are sure that the transfer hasn't | |
1371 | * been cancelled (ECONNRESET, ENOENT), which could mean that | |
1372 | * seg->xfer could be already gone. | |
1373 | */ | |
1374 | static void wa_buf_in_cb(struct urb *urb) | |
1375 | { | |
1376 | struct wa_seg *seg = urb->context; | |
1377 | struct wa_xfer *xfer = seg->xfer; | |
1378 | struct wahc *wa; | |
1379 | struct device *dev; | |
1380 | struct wa_rpipe *rpipe; | |
1381 | unsigned rpipe_ready; | |
1382 | unsigned long flags; | |
1383 | u8 done = 0; | |
1384 | ||
df365423 IPG |
1385 | switch (urb->status) { |
1386 | case 0: | |
1387 | spin_lock_irqsave(&xfer->lock, flags); | |
1388 | wa = xfer->wa; | |
1389 | dev = &wa->usb_iface->dev; | |
1390 | rpipe = xfer->ep->hcpriv; | |
bce83697 DV |
1391 | dev_dbg(dev, "xfer %p#%u: data in done (%zu bytes)\n", |
1392 | xfer, seg->index, (size_t)urb->actual_length); | |
df365423 IPG |
1393 | seg->status = WA_SEG_DONE; |
1394 | seg->result = urb->actual_length; | |
1395 | xfer->segs_done++; | |
1396 | rpipe_ready = rpipe_avail_inc(rpipe); | |
1397 | done = __wa_xfer_is_done(xfer); | |
1398 | spin_unlock_irqrestore(&xfer->lock, flags); | |
1399 | if (done) | |
1400 | wa_xfer_completion(xfer); | |
1401 | if (rpipe_ready) | |
1402 | wa_xfer_delayed_run(rpipe); | |
1403 | break; | |
1404 | case -ECONNRESET: /* URB unlinked; no need to do anything */ | |
1405 | case -ENOENT: /* as it was done by the who unlinked us */ | |
1406 | break; | |
1407 | default: /* Other errors ... */ | |
1408 | spin_lock_irqsave(&xfer->lock, flags); | |
1409 | wa = xfer->wa; | |
1410 | dev = &wa->usb_iface->dev; | |
1411 | rpipe = xfer->ep->hcpriv; | |
1412 | if (printk_ratelimit()) | |
1413 | dev_err(dev, "xfer %p#%u: data in error %d\n", | |
1414 | xfer, seg->index, urb->status); | |
1415 | if (edc_inc(&wa->nep_edc, EDC_MAX_ERRORS, | |
1416 | EDC_ERROR_TIMEFRAME)){ | |
1417 | dev_err(dev, "DTO: URB max acceptable errors " | |
1418 | "exceeded, resetting device\n"); | |
1419 | wa_reset_all(wa); | |
1420 | } | |
1421 | seg->status = WA_SEG_ERROR; | |
1422 | seg->result = urb->status; | |
1423 | xfer->segs_done++; | |
1424 | rpipe_ready = rpipe_avail_inc(rpipe); | |
1425 | __wa_xfer_abort(xfer); | |
1426 | done = __wa_xfer_is_done(xfer); | |
1427 | spin_unlock_irqrestore(&xfer->lock, flags); | |
1428 | if (done) | |
1429 | wa_xfer_completion(xfer); | |
1430 | if (rpipe_ready) | |
1431 | wa_xfer_delayed_run(rpipe); | |
1432 | } | |
df365423 IPG |
1433 | } |
1434 | ||
1435 | /* | |
1436 | * Handle an incoming transfer result buffer | |
1437 | * | |
1438 | * Given a transfer result buffer, it completes the transfer (possibly | |
1439 | * scheduling and buffer in read) and then resubmits the DTI URB for a | |
1440 | * new transfer result read. | |
1441 | * | |
1442 | * | |
1443 | * The xfer_result DTI URB state machine | |
1444 | * | |
1445 | * States: OFF | RXR (Read-Xfer-Result) | RBI (Read-Buffer-In) | |
1446 | * | |
1447 | * We start in OFF mode, the first xfer_result notification [through | |
1448 | * wa_handle_notif_xfer()] moves us to RXR by posting the DTI-URB to | |
1449 | * read. | |
1450 | * | |
1451 | * We receive a buffer -- if it is not a xfer_result, we complain and | |
1452 | * repost the DTI-URB. If it is a xfer_result then do the xfer seg | |
1453 | * request accounting. If it is an IN segment, we move to RBI and post | |
1454 | * a BUF-IN-URB to the right buffer. The BUF-IN-URB callback will | |
1455 | * repost the DTI-URB and move to RXR state. if there was no IN | |
1456 | * segment, it will repost the DTI-URB. | |
1457 | * | |
1458 | * We go back to OFF when we detect a ENOENT or ESHUTDOWN (or too many | |
1459 | * errors) in the URBs. | |
1460 | */ | |
1461 | static void wa_xfer_result_cb(struct urb *urb) | |
1462 | { | |
1463 | int result; | |
1464 | struct wahc *wa = urb->context; | |
1465 | struct device *dev = &wa->usb_iface->dev; | |
1466 | struct wa_xfer_result *xfer_result; | |
1467 | u32 xfer_id; | |
1468 | struct wa_xfer *xfer; | |
1469 | u8 usb_status; | |
1470 | ||
df365423 IPG |
1471 | BUG_ON(wa->dti_urb != urb); |
1472 | switch (wa->dti_urb->status) { | |
1473 | case 0: | |
1474 | /* We have a xfer result buffer; check it */ | |
bce83697 DV |
1475 | dev_dbg(dev, "DTI: xfer result %d bytes at %p\n", |
1476 | urb->actual_length, urb->transfer_buffer); | |
df365423 IPG |
1477 | if (wa->dti_urb->actual_length != sizeof(*xfer_result)) { |
1478 | dev_err(dev, "DTI Error: xfer result--bad size " | |
1479 | "xfer result (%d bytes vs %zu needed)\n", | |
1480 | urb->actual_length, sizeof(*xfer_result)); | |
1481 | break; | |
1482 | } | |
1483 | xfer_result = wa->xfer_result; | |
1484 | if (xfer_result->hdr.bLength != sizeof(*xfer_result)) { | |
1485 | dev_err(dev, "DTI Error: xfer result--" | |
1486 | "bad header length %u\n", | |
1487 | xfer_result->hdr.bLength); | |
1488 | break; | |
1489 | } | |
1490 | if (xfer_result->hdr.bNotifyType != WA_XFER_RESULT) { | |
1491 | dev_err(dev, "DTI Error: xfer result--" | |
1492 | "bad header type 0x%02x\n", | |
1493 | xfer_result->hdr.bNotifyType); | |
1494 | break; | |
1495 | } | |
1496 | usb_status = xfer_result->bTransferStatus & 0x3f; | |
1497 | if (usb_status == WA_XFER_STATUS_ABORTED | |
1498 | || usb_status == WA_XFER_STATUS_NOT_FOUND) | |
1499 | /* taken care of already */ | |
1500 | break; | |
1501 | xfer_id = xfer_result->dwTransferID; | |
1502 | xfer = wa_xfer_get_by_id(wa, xfer_id); | |
1503 | if (xfer == NULL) { | |
1504 | /* FIXME: transaction might have been cancelled */ | |
1505 | dev_err(dev, "DTI Error: xfer result--" | |
1506 | "unknown xfer 0x%08x (status 0x%02x)\n", | |
1507 | xfer_id, usb_status); | |
1508 | break; | |
1509 | } | |
1510 | wa_xfer_result_chew(wa, xfer); | |
1511 | wa_xfer_put(xfer); | |
1512 | break; | |
1513 | case -ENOENT: /* (we killed the URB)...so, no broadcast */ | |
1514 | case -ESHUTDOWN: /* going away! */ | |
1515 | dev_dbg(dev, "DTI: going down! %d\n", urb->status); | |
1516 | goto out; | |
1517 | default: | |
1518 | /* Unknown error */ | |
1519 | if (edc_inc(&wa->dti_edc, EDC_MAX_ERRORS, | |
1520 | EDC_ERROR_TIMEFRAME)) { | |
1521 | dev_err(dev, "DTI: URB max acceptable errors " | |
1522 | "exceeded, resetting device\n"); | |
1523 | wa_reset_all(wa); | |
1524 | goto out; | |
1525 | } | |
1526 | if (printk_ratelimit()) | |
1527 | dev_err(dev, "DTI: URB error %d\n", urb->status); | |
1528 | break; | |
1529 | } | |
1530 | /* Resubmit the DTI URB */ | |
1531 | result = usb_submit_urb(wa->dti_urb, GFP_ATOMIC); | |
1532 | if (result < 0) { | |
1533 | dev_err(dev, "DTI Error: Could not submit DTI URB (%d), " | |
1534 | "resetting\n", result); | |
1535 | wa_reset_all(wa); | |
1536 | } | |
1537 | out: | |
df365423 IPG |
1538 | return; |
1539 | } | |
1540 | ||
1541 | /* | |
1542 | * Transfer complete notification | |
1543 | * | |
1544 | * Called from the notif.c code. We get a notification on EP2 saying | |
1545 | * that some endpoint has some transfer result data available. We are | |
1546 | * about to read it. | |
1547 | * | |
1548 | * To speed up things, we always have a URB reading the DTI URB; we | |
1549 | * don't really set it up and start it until the first xfer complete | |
1550 | * notification arrives, which is what we do here. | |
1551 | * | |
1552 | * Follow up in wa_xfer_result_cb(), as that's where the whole state | |
1553 | * machine starts. | |
1554 | * | |
1555 | * So here we just initialize the DTI URB for reading transfer result | |
1556 | * notifications and also the buffer-in URB, for reading buffers. Then | |
1557 | * we just submit the DTI URB. | |
1558 | * | |
1559 | * @wa shall be referenced | |
1560 | */ | |
1561 | void wa_handle_notif_xfer(struct wahc *wa, struct wa_notif_hdr *notif_hdr) | |
1562 | { | |
1563 | int result; | |
1564 | struct device *dev = &wa->usb_iface->dev; | |
1565 | struct wa_notif_xfer *notif_xfer; | |
1566 | const struct usb_endpoint_descriptor *dti_epd = wa->dti_epd; | |
1567 | ||
df365423 IPG |
1568 | notif_xfer = container_of(notif_hdr, struct wa_notif_xfer, hdr); |
1569 | BUG_ON(notif_hdr->bNotifyType != WA_NOTIF_TRANSFER); | |
1570 | ||
1571 | if ((0x80 | notif_xfer->bEndpoint) != dti_epd->bEndpointAddress) { | |
1572 | /* FIXME: hardcoded limitation, adapt */ | |
1573 | dev_err(dev, "BUG: DTI ep is %u, not %u (hack me)\n", | |
1574 | notif_xfer->bEndpoint, dti_epd->bEndpointAddress); | |
1575 | goto error; | |
1576 | } | |
1577 | if (wa->dti_urb != NULL) /* DTI URB already started */ | |
1578 | goto out; | |
1579 | ||
1580 | wa->dti_urb = usb_alloc_urb(0, GFP_KERNEL); | |
1581 | if (wa->dti_urb == NULL) { | |
1582 | dev_err(dev, "Can't allocate DTI URB\n"); | |
1583 | goto error_dti_urb_alloc; | |
1584 | } | |
1585 | usb_fill_bulk_urb( | |
1586 | wa->dti_urb, wa->usb_dev, | |
1587 | usb_rcvbulkpipe(wa->usb_dev, 0x80 | notif_xfer->bEndpoint), | |
1588 | wa->xfer_result, wa->xfer_result_size, | |
1589 | wa_xfer_result_cb, wa); | |
1590 | ||
1591 | wa->buf_in_urb = usb_alloc_urb(0, GFP_KERNEL); | |
1592 | if (wa->buf_in_urb == NULL) { | |
1593 | dev_err(dev, "Can't allocate BUF-IN URB\n"); | |
1594 | goto error_buf_in_urb_alloc; | |
1595 | } | |
1596 | usb_fill_bulk_urb( | |
1597 | wa->buf_in_urb, wa->usb_dev, | |
1598 | usb_rcvbulkpipe(wa->usb_dev, 0x80 | notif_xfer->bEndpoint), | |
1599 | NULL, 0, wa_buf_in_cb, wa); | |
1600 | result = usb_submit_urb(wa->dti_urb, GFP_KERNEL); | |
1601 | if (result < 0) { | |
1602 | dev_err(dev, "DTI Error: Could not submit DTI URB (%d), " | |
1603 | "resetting\n", result); | |
1604 | goto error_dti_urb_submit; | |
1605 | } | |
1606 | out: | |
df365423 IPG |
1607 | return; |
1608 | ||
1609 | error_dti_urb_submit: | |
1610 | usb_put_urb(wa->buf_in_urb); | |
1611 | error_buf_in_urb_alloc: | |
1612 | usb_put_urb(wa->dti_urb); | |
1613 | wa->dti_urb = NULL; | |
1614 | error_dti_urb_alloc: | |
1615 | error: | |
1616 | wa_reset_all(wa); | |
df365423 | 1617 | } |