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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 | * | |
25985edc | 64 | * (a) set up a timer every time an rpipe's use count drops to 1 |
df365423 IPG |
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 | |
f77f13e2 | 79 | * availability of the different required components (blocks, |
df365423 IPG |
80 | * rpipes, segment slots, etc), we go scheduling them. Painful. |
81 | */ | |
82 | #include <linux/init.h> | |
83 | #include <linux/spinlock.h> | |
5a0e3ad6 | 84 | #include <linux/slab.h> |
df365423 | 85 | #include <linux/hash.h> |
9708cd2f | 86 | #include <linux/ratelimit.h> |
f940fcd8 | 87 | #include <linux/export.h> |
2b81c083 | 88 | #include <linux/scatterlist.h> |
bce83697 | 89 | |
df365423 IPG |
90 | #include "wa-hc.h" |
91 | #include "wusbhc.h" | |
92 | ||
df365423 | 93 | enum { |
f74b75e7 TP |
94 | /* [WUSB] section 8.3.3 allocates 7 bits for the segment index. */ |
95 | WA_SEGS_MAX = 128, | |
df365423 IPG |
96 | }; |
97 | ||
98 | enum wa_seg_status { | |
99 | WA_SEG_NOTREADY, | |
100 | WA_SEG_READY, | |
101 | WA_SEG_DELAYED, | |
102 | WA_SEG_SUBMITTED, | |
103 | WA_SEG_PENDING, | |
104 | WA_SEG_DTI_PENDING, | |
105 | WA_SEG_DONE, | |
106 | WA_SEG_ERROR, | |
107 | WA_SEG_ABORTED, | |
108 | }; | |
109 | ||
110 | static void wa_xfer_delayed_run(struct wa_rpipe *); | |
679ee475 | 111 | static int __wa_xfer_delayed_run(struct wa_rpipe *rpipe, int *dto_waiting); |
df365423 IPG |
112 | |
113 | /* | |
114 | * Life cycle governed by 'struct urb' (the refcount of the struct is | |
115 | * that of the 'struct urb' and usb_free_urb() would free the whole | |
116 | * struct). | |
117 | */ | |
118 | struct wa_seg { | |
09d94cbd | 119 | struct urb tr_urb; /* transfer request urb. */ |
7a32d9be | 120 | struct urb *isoc_pack_desc_urb; /* for isoc packet descriptor. */ |
09d94cbd | 121 | struct urb *dto_urb; /* for data output. */ |
df365423 IPG |
122 | struct list_head list_node; /* for rpipe->req_list */ |
123 | struct wa_xfer *xfer; /* out xfer */ | |
124 | u8 index; /* which segment we are */ | |
2101242c TP |
125 | int isoc_frame_count; /* number of isoc frames in this segment. */ |
126 | int isoc_frame_offset; /* starting frame offset in the xfer URB. */ | |
127 | int isoc_size; /* size of all isoc frames sent by this seg. */ | |
df365423 IPG |
128 | enum wa_seg_status status; |
129 | ssize_t result; /* bytes xfered or error */ | |
130 | struct wa_xfer_hdr xfer_hdr; | |
df365423 IPG |
131 | }; |
132 | ||
66591015 | 133 | static inline void wa_seg_init(struct wa_seg *seg) |
df365423 | 134 | { |
09d94cbd | 135 | usb_init_urb(&seg->tr_urb); |
66591015 TP |
136 | |
137 | /* set the remaining memory to 0. */ | |
09d94cbd TP |
138 | memset(((void *)seg) + sizeof(seg->tr_urb), 0, |
139 | sizeof(*seg) - sizeof(seg->tr_urb)); | |
df365423 IPG |
140 | } |
141 | ||
142 | /* | |
143 | * Protected by xfer->lock | |
144 | * | |
145 | */ | |
146 | struct wa_xfer { | |
147 | struct kref refcnt; | |
148 | struct list_head list_node; | |
149 | spinlock_t lock; | |
150 | u32 id; | |
151 | ||
152 | struct wahc *wa; /* Wire adapter we are plugged to */ | |
153 | struct usb_host_endpoint *ep; | |
25985edc | 154 | struct urb *urb; /* URB we are transferring for */ |
df365423 IPG |
155 | struct wa_seg **seg; /* transfer segments */ |
156 | u8 segs, segs_submitted, segs_done; | |
157 | unsigned is_inbound:1; | |
158 | unsigned is_dma:1; | |
159 | size_t seg_size; | |
160 | int result; | |
2101242c TP |
161 | /* Isoc frame that the current transfer buffer corresponds to. */ |
162 | int dto_isoc_frame_index; | |
df365423 IPG |
163 | |
164 | gfp_t gfp; /* allocation mask */ | |
165 | ||
166 | struct wusb_dev *wusb_dev; /* for activity timestamps */ | |
167 | }; | |
168 | ||
2101242c TP |
169 | static void __wa_populate_dto_urb_isoc(struct wa_xfer *xfer, |
170 | struct wa_seg *seg, int curr_iso_frame); | |
171 | ||
df365423 IPG |
172 | static inline void wa_xfer_init(struct wa_xfer *xfer) |
173 | { | |
174 | kref_init(&xfer->refcnt); | |
175 | INIT_LIST_HEAD(&xfer->list_node); | |
176 | spin_lock_init(&xfer->lock); | |
177 | } | |
178 | ||
179 | /* | |
25985edc | 180 | * Destroy a transfer structure |
df365423 | 181 | * |
7a32d9be | 182 | * Note that freeing xfer->seg[cnt]->tr_urb will free the containing |
79731cbd | 183 | * xfer->seg[cnt] memory that was allocated by __wa_xfer_setup_segs. |
df365423 IPG |
184 | */ |
185 | static void wa_xfer_destroy(struct kref *_xfer) | |
186 | { | |
187 | struct wa_xfer *xfer = container_of(_xfer, struct wa_xfer, refcnt); | |
188 | if (xfer->seg) { | |
189 | unsigned cnt; | |
190 | for (cnt = 0; cnt < xfer->segs; cnt++) { | |
7a32d9be TP |
191 | struct wa_seg *seg = xfer->seg[cnt]; |
192 | if (seg) { | |
193 | usb_free_urb(seg->isoc_pack_desc_urb); | |
194 | if (seg->dto_urb) { | |
195 | kfree(seg->dto_urb->sg); | |
196 | usb_free_urb(seg->dto_urb); | |
d993670c | 197 | } |
7a32d9be | 198 | usb_free_urb(&seg->tr_urb); |
d993670c | 199 | } |
df365423 | 200 | } |
d993670c | 201 | kfree(xfer->seg); |
df365423 IPG |
202 | } |
203 | kfree(xfer); | |
df365423 IPG |
204 | } |
205 | ||
206 | static void wa_xfer_get(struct wa_xfer *xfer) | |
207 | { | |
208 | kref_get(&xfer->refcnt); | |
209 | } | |
210 | ||
211 | static void wa_xfer_put(struct wa_xfer *xfer) | |
212 | { | |
df365423 | 213 | kref_put(&xfer->refcnt, wa_xfer_destroy); |
df365423 IPG |
214 | } |
215 | ||
679ee475 TP |
216 | /* |
217 | * Try to get exclusive access to the DTO endpoint resource. Return true | |
218 | * if successful. | |
219 | */ | |
220 | static inline int __wa_dto_try_get(struct wahc *wa) | |
221 | { | |
222 | return (test_and_set_bit(0, &wa->dto_in_use) == 0); | |
223 | } | |
224 | ||
225 | /* Release the DTO endpoint resource. */ | |
226 | static inline void __wa_dto_put(struct wahc *wa) | |
227 | { | |
228 | clear_bit_unlock(0, &wa->dto_in_use); | |
229 | } | |
230 | ||
231 | /* Service RPIPEs that are waiting on the DTO resource. */ | |
232 | static void wa_check_for_delayed_rpipes(struct wahc *wa) | |
233 | { | |
234 | unsigned long flags; | |
235 | int dto_waiting = 0; | |
236 | struct wa_rpipe *rpipe; | |
237 | ||
238 | spin_lock_irqsave(&wa->rpipe_lock, flags); | |
239 | while (!list_empty(&wa->rpipe_delayed_list) && !dto_waiting) { | |
240 | rpipe = list_first_entry(&wa->rpipe_delayed_list, | |
241 | struct wa_rpipe, list_node); | |
242 | __wa_xfer_delayed_run(rpipe, &dto_waiting); | |
243 | /* remove this RPIPE from the list if it is not waiting. */ | |
244 | if (!dto_waiting) { | |
245 | pr_debug("%s: RPIPE %d serviced and removed from delayed list.\n", | |
246 | __func__, | |
247 | le16_to_cpu(rpipe->descr.wRPipeIndex)); | |
248 | list_del_init(&rpipe->list_node); | |
249 | } | |
250 | } | |
251 | spin_unlock_irqrestore(&wa->rpipe_lock, flags); | |
252 | } | |
253 | ||
254 | /* add this RPIPE to the end of the delayed RPIPE list. */ | |
255 | static void wa_add_delayed_rpipe(struct wahc *wa, struct wa_rpipe *rpipe) | |
256 | { | |
257 | unsigned long flags; | |
258 | ||
259 | spin_lock_irqsave(&wa->rpipe_lock, flags); | |
260 | /* add rpipe to the list if it is not already on it. */ | |
261 | if (list_empty(&rpipe->list_node)) { | |
262 | pr_debug("%s: adding RPIPE %d to the delayed list.\n", | |
263 | __func__, le16_to_cpu(rpipe->descr.wRPipeIndex)); | |
264 | list_add_tail(&rpipe->list_node, &wa->rpipe_delayed_list); | |
265 | } | |
266 | spin_unlock_irqrestore(&wa->rpipe_lock, flags); | |
267 | } | |
268 | ||
df365423 IPG |
269 | /* |
270 | * xfer is referenced | |
271 | * | |
272 | * xfer->lock has to be unlocked | |
273 | * | |
274 | * We take xfer->lock for setting the result; this is a barrier | |
275 | * against drivers/usb/core/hcd.c:unlink1() being called after we call | |
276 | * usb_hcd_giveback_urb() and wa_urb_dequeue() trying to get a | |
277 | * reference to the transfer. | |
278 | */ | |
279 | static void wa_xfer_giveback(struct wa_xfer *xfer) | |
280 | { | |
281 | unsigned long flags; | |
bce83697 | 282 | |
df365423 IPG |
283 | spin_lock_irqsave(&xfer->wa->xfer_list_lock, flags); |
284 | list_del_init(&xfer->list_node); | |
b374487e | 285 | usb_hcd_unlink_urb_from_ep(&(xfer->wa->wusb->usb_hcd), xfer->urb); |
df365423 IPG |
286 | spin_unlock_irqrestore(&xfer->wa->xfer_list_lock, flags); |
287 | /* FIXME: segmentation broken -- kills DWA */ | |
288 | wusbhc_giveback_urb(xfer->wa->wusb, xfer->urb, xfer->result); | |
289 | wa_put(xfer->wa); | |
290 | wa_xfer_put(xfer); | |
df365423 IPG |
291 | } |
292 | ||
293 | /* | |
294 | * xfer is referenced | |
295 | * | |
296 | * xfer->lock has to be unlocked | |
297 | */ | |
298 | static void wa_xfer_completion(struct wa_xfer *xfer) | |
299 | { | |
df365423 IPG |
300 | if (xfer->wusb_dev) |
301 | wusb_dev_put(xfer->wusb_dev); | |
302 | rpipe_put(xfer->ep->hcpriv); | |
303 | wa_xfer_giveback(xfer); | |
df365423 IPG |
304 | } |
305 | ||
b9c84be6 TP |
306 | /* |
307 | * Initialize a transfer's ID | |
308 | * | |
309 | * We need to use a sequential number; if we use the pointer or the | |
310 | * hash of the pointer, it can repeat over sequential transfers and | |
311 | * then it will confuse the HWA....wonder why in hell they put a 32 | |
312 | * bit handle in there then. | |
313 | */ | |
314 | static void wa_xfer_id_init(struct wa_xfer *xfer) | |
315 | { | |
316 | xfer->id = atomic_add_return(1, &xfer->wa->xfer_id_count); | |
317 | } | |
318 | ||
319 | /* Return the xfer's ID. */ | |
320 | static inline u32 wa_xfer_id(struct wa_xfer *xfer) | |
321 | { | |
322 | return xfer->id; | |
323 | } | |
324 | ||
325 | /* Return the xfer's ID in transport format (little endian). */ | |
326 | static inline __le32 wa_xfer_id_le32(struct wa_xfer *xfer) | |
327 | { | |
328 | return cpu_to_le32(xfer->id); | |
329 | } | |
330 | ||
df365423 IPG |
331 | /* |
332 | * If transfer is done, wrap it up and return true | |
333 | * | |
334 | * xfer->lock has to be locked | |
335 | */ | |
336 | static unsigned __wa_xfer_is_done(struct wa_xfer *xfer) | |
337 | { | |
bce83697 | 338 | struct device *dev = &xfer->wa->usb_iface->dev; |
df365423 IPG |
339 | unsigned result, cnt; |
340 | struct wa_seg *seg; | |
341 | struct urb *urb = xfer->urb; | |
342 | unsigned found_short = 0; | |
343 | ||
df365423 IPG |
344 | result = xfer->segs_done == xfer->segs_submitted; |
345 | if (result == 0) | |
346 | goto out; | |
347 | urb->actual_length = 0; | |
348 | for (cnt = 0; cnt < xfer->segs; cnt++) { | |
349 | seg = xfer->seg[cnt]; | |
350 | switch (seg->status) { | |
351 | case WA_SEG_DONE: | |
352 | if (found_short && seg->result > 0) { | |
b9c84be6 TP |
353 | dev_dbg(dev, "xfer %p ID %08X#%u: bad short segments (%zu)\n", |
354 | xfer, wa_xfer_id(xfer), cnt, | |
355 | seg->result); | |
df365423 IPG |
356 | urb->status = -EINVAL; |
357 | goto out; | |
358 | } | |
359 | urb->actual_length += seg->result; | |
7a32d9be TP |
360 | if (!(usb_pipeisoc(xfer->urb->pipe)) |
361 | && seg->result < xfer->seg_size | |
df365423 IPG |
362 | && cnt != xfer->segs-1) |
363 | found_short = 1; | |
b9c84be6 | 364 | dev_dbg(dev, "xfer %p ID %08X#%u: DONE short %d " |
bce83697 | 365 | "result %zu urb->actual_length %d\n", |
b9c84be6 TP |
366 | xfer, wa_xfer_id(xfer), seg->index, found_short, |
367 | seg->result, urb->actual_length); | |
df365423 IPG |
368 | break; |
369 | case WA_SEG_ERROR: | |
370 | xfer->result = seg->result; | |
cccd3a25 | 371 | dev_dbg(dev, "xfer %p ID %08X#%u: ERROR result %zu(0x%08zX)\n", |
b9c84be6 TP |
372 | xfer, wa_xfer_id(xfer), seg->index, seg->result, |
373 | seg->result); | |
df365423 IPG |
374 | goto out; |
375 | case WA_SEG_ABORTED: | |
bbfc3420 TP |
376 | xfer->result = seg->result; |
377 | dev_dbg(dev, "xfer %p ID %08X#%u: ABORTED result %zu(0x%08zX)\n", | |
378 | xfer, wa_xfer_id(xfer), seg->index, seg->result, | |
379 | seg->result); | |
df365423 IPG |
380 | goto out; |
381 | default: | |
b9c84be6 TP |
382 | dev_warn(dev, "xfer %p ID %08X#%u: is_done bad state %d\n", |
383 | xfer, wa_xfer_id(xfer), cnt, seg->status); | |
df365423 | 384 | xfer->result = -EINVAL; |
df365423 IPG |
385 | goto out; |
386 | } | |
387 | } | |
388 | xfer->result = 0; | |
389 | out: | |
df365423 IPG |
390 | return result; |
391 | } | |
392 | ||
df365423 IPG |
393 | /* |
394 | * Search for a transfer list ID on the HCD's URB list | |
395 | * | |
396 | * For 32 bit architectures, we use the pointer itself; for 64 bits, a | |
397 | * 32-bit hash of the pointer. | |
398 | * | |
399 | * @returns NULL if not found. | |
400 | */ | |
401 | static struct wa_xfer *wa_xfer_get_by_id(struct wahc *wa, u32 id) | |
402 | { | |
403 | unsigned long flags; | |
404 | struct wa_xfer *xfer_itr; | |
405 | spin_lock_irqsave(&wa->xfer_list_lock, flags); | |
406 | list_for_each_entry(xfer_itr, &wa->xfer_list, list_node) { | |
407 | if (id == xfer_itr->id) { | |
408 | wa_xfer_get(xfer_itr); | |
409 | goto out; | |
410 | } | |
411 | } | |
412 | xfer_itr = NULL; | |
413 | out: | |
414 | spin_unlock_irqrestore(&wa->xfer_list_lock, flags); | |
415 | return xfer_itr; | |
416 | } | |
417 | ||
418 | struct wa_xfer_abort_buffer { | |
419 | struct urb urb; | |
420 | struct wa_xfer_abort cmd; | |
421 | }; | |
422 | ||
423 | static void __wa_xfer_abort_cb(struct urb *urb) | |
424 | { | |
425 | struct wa_xfer_abort_buffer *b = urb->context; | |
426 | usb_put_urb(&b->urb); | |
427 | } | |
428 | ||
429 | /* | |
430 | * Aborts an ongoing transaction | |
431 | * | |
432 | * Assumes the transfer is referenced and locked and in a submitted | |
433 | * state (mainly that there is an endpoint/rpipe assigned). | |
434 | * | |
435 | * The callback (see above) does nothing but freeing up the data by | |
436 | * putting the URB. Because the URB is allocated at the head of the | |
14e1d2df | 437 | * struct, the whole space we allocated is kfreed. * |
df365423 | 438 | */ |
14e1d2df | 439 | static int __wa_xfer_abort(struct wa_xfer *xfer) |
df365423 | 440 | { |
14e1d2df | 441 | int result = -ENOMEM; |
df365423 IPG |
442 | struct device *dev = &xfer->wa->usb_iface->dev; |
443 | struct wa_xfer_abort_buffer *b; | |
444 | struct wa_rpipe *rpipe = xfer->ep->hcpriv; | |
445 | ||
446 | b = kmalloc(sizeof(*b), GFP_ATOMIC); | |
447 | if (b == NULL) | |
448 | goto error_kmalloc; | |
449 | b->cmd.bLength = sizeof(b->cmd); | |
450 | b->cmd.bRequestType = WA_XFER_ABORT; | |
451 | b->cmd.wRPipe = rpipe->descr.wRPipeIndex; | |
fdd160c3 | 452 | b->cmd.dwTransferID = wa_xfer_id_le32(xfer); |
df365423 IPG |
453 | |
454 | usb_init_urb(&b->urb); | |
455 | usb_fill_bulk_urb(&b->urb, xfer->wa->usb_dev, | |
456 | usb_sndbulkpipe(xfer->wa->usb_dev, | |
457 | xfer->wa->dto_epd->bEndpointAddress), | |
458 | &b->cmd, sizeof(b->cmd), __wa_xfer_abort_cb, b); | |
459 | result = usb_submit_urb(&b->urb, GFP_ATOMIC); | |
460 | if (result < 0) | |
461 | goto error_submit; | |
14e1d2df | 462 | return result; /* callback frees! */ |
df365423 IPG |
463 | |
464 | ||
465 | error_submit: | |
466 | if (printk_ratelimit()) | |
467 | dev_err(dev, "xfer %p: Can't submit abort request: %d\n", | |
468 | xfer, result); | |
469 | kfree(b); | |
470 | error_kmalloc: | |
14e1d2df | 471 | return result; |
df365423 IPG |
472 | |
473 | } | |
474 | ||
2101242c TP |
475 | /* |
476 | * Calculate the number of isoc frames starting from isoc_frame_offset | |
477 | * that will fit a in transfer segment. | |
478 | */ | |
479 | static int __wa_seg_calculate_isoc_frame_count(struct wa_xfer *xfer, | |
480 | int isoc_frame_offset, int *total_size) | |
481 | { | |
482 | int segment_size = 0, frame_count = 0; | |
483 | int index = isoc_frame_offset; | |
f07ddb9e TP |
484 | struct usb_iso_packet_descriptor *iso_frame_desc = |
485 | xfer->urb->iso_frame_desc; | |
2101242c TP |
486 | |
487 | while ((index < xfer->urb->number_of_packets) | |
f07ddb9e | 488 | && ((segment_size + iso_frame_desc[index].length) |
2101242c | 489 | <= xfer->seg_size)) { |
f07ddb9e TP |
490 | /* |
491 | * For Alereon HWA devices, only include an isoc frame in a | |
492 | * segment if it is physically contiguous with the previous | |
493 | * frame. This is required because those devices expect | |
494 | * the isoc frames to be sent as a single USB transaction as | |
495 | * opposed to one transaction per frame with standard HWA. | |
496 | */ | |
497 | if ((xfer->wa->quirks & WUSB_QUIRK_ALEREON_HWA_CONCAT_ISOC) | |
498 | && (index > isoc_frame_offset) | |
499 | && ((iso_frame_desc[index - 1].offset + | |
500 | iso_frame_desc[index - 1].length) != | |
501 | iso_frame_desc[index].offset)) | |
502 | break; | |
503 | ||
2101242c TP |
504 | /* this frame fits. count it. */ |
505 | ++frame_count; | |
f07ddb9e | 506 | segment_size += iso_frame_desc[index].length; |
2101242c TP |
507 | |
508 | /* move to the next isoc frame. */ | |
509 | ++index; | |
510 | } | |
511 | ||
512 | *total_size = segment_size; | |
513 | return frame_count; | |
514 | } | |
515 | ||
df365423 IPG |
516 | /* |
517 | * | |
518 | * @returns < 0 on error, transfer segment request size if ok | |
519 | */ | |
520 | static ssize_t __wa_xfer_setup_sizes(struct wa_xfer *xfer, | |
521 | enum wa_xfer_type *pxfer_type) | |
522 | { | |
523 | ssize_t result; | |
524 | struct device *dev = &xfer->wa->usb_iface->dev; | |
525 | size_t maxpktsize; | |
526 | struct urb *urb = xfer->urb; | |
527 | struct wa_rpipe *rpipe = xfer->ep->hcpriv; | |
528 | ||
df365423 IPG |
529 | switch (rpipe->descr.bmAttribute & 0x3) { |
530 | case USB_ENDPOINT_XFER_CONTROL: | |
531 | *pxfer_type = WA_XFER_TYPE_CTL; | |
532 | result = sizeof(struct wa_xfer_ctl); | |
533 | break; | |
534 | case USB_ENDPOINT_XFER_INT: | |
535 | case USB_ENDPOINT_XFER_BULK: | |
536 | *pxfer_type = WA_XFER_TYPE_BI; | |
537 | result = sizeof(struct wa_xfer_bi); | |
538 | break; | |
539 | case USB_ENDPOINT_XFER_ISOC: | |
7a32d9be TP |
540 | if (usb_pipeout(urb->pipe)) { |
541 | *pxfer_type = WA_XFER_TYPE_ISO; | |
542 | result = sizeof(struct wa_xfer_hwaiso); | |
543 | } else { | |
544 | dev_err(dev, "FIXME: ISOC IN not implemented\n"); | |
545 | result = -ENOSYS; | |
546 | goto error; | |
547 | } | |
548 | break; | |
df365423 IPG |
549 | default: |
550 | /* never happens */ | |
551 | BUG(); | |
552 | result = -EINVAL; /* shut gcc up */ | |
7a32d9be | 553 | } |
df365423 IPG |
554 | xfer->is_inbound = urb->pipe & USB_DIR_IN ? 1 : 0; |
555 | xfer->is_dma = urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP ? 1 : 0; | |
7a32d9be | 556 | |
df365423 | 557 | maxpktsize = le16_to_cpu(rpipe->descr.wMaxPacketSize); |
7a32d9be | 558 | if ((rpipe->descr.bmAttribute & 0x3) == USB_ENDPOINT_XFER_ISOC) { |
2101242c TP |
559 | int index = 0; |
560 | ||
7a32d9be | 561 | xfer->seg_size = maxpktsize; |
2101242c TP |
562 | xfer->segs = 0; |
563 | /* | |
564 | * loop over urb->number_of_packets to determine how many | |
565 | * xfer segments will be needed to send the isoc frames. | |
566 | */ | |
567 | while (index < urb->number_of_packets) { | |
568 | int seg_size; /* don't care. */ | |
569 | index += __wa_seg_calculate_isoc_frame_count(xfer, | |
570 | index, &seg_size); | |
571 | ++xfer->segs; | |
572 | } | |
7a32d9be TP |
573 | } else { |
574 | xfer->seg_size = le16_to_cpu(rpipe->descr.wBlocks) | |
575 | * 1 << (xfer->wa->wa_descr->bRPipeBlockSize - 1); | |
576 | /* Compute the segment size and make sure it is a multiple of | |
577 | * the maxpktsize (WUSB1.0[8.3.3.1])...not really too much of | |
578 | * a check (FIXME) */ | |
579 | if (xfer->seg_size < maxpktsize) { | |
580 | dev_err(dev, | |
581 | "HW BUG? seg_size %zu smaller than maxpktsize %zu\n", | |
582 | xfer->seg_size, maxpktsize); | |
583 | result = -EINVAL; | |
584 | goto error; | |
585 | } | |
586 | xfer->seg_size = (xfer->seg_size / maxpktsize) * maxpktsize; | |
587 | xfer->segs = DIV_ROUND_UP(urb->transfer_buffer_length, | |
588 | xfer->seg_size); | |
7a32d9be TP |
589 | if (xfer->segs == 0 && *pxfer_type == WA_XFER_TYPE_CTL) |
590 | xfer->segs = 1; | |
df365423 | 591 | } |
2101242c | 592 | |
f74b75e7 | 593 | if (xfer->segs > WA_SEGS_MAX) { |
2101242c TP |
594 | dev_err(dev, "BUG? oops, number of segments %zu bigger than %d\n", |
595 | (urb->transfer_buffer_length/xfer->seg_size), | |
596 | WA_SEGS_MAX); | |
597 | result = -EINVAL; | |
598 | goto error; | |
599 | } | |
df365423 | 600 | error: |
df365423 IPG |
601 | return result; |
602 | } | |
603 | ||
2101242c TP |
604 | static void __wa_setup_isoc_packet_descr( |
605 | struct wa_xfer_packet_info_hwaiso *packet_desc, | |
606 | struct wa_xfer *xfer, | |
607 | struct wa_seg *seg) { | |
608 | struct usb_iso_packet_descriptor *iso_frame_desc = | |
609 | xfer->urb->iso_frame_desc; | |
610 | int frame_index; | |
611 | ||
612 | /* populate isoc packet descriptor. */ | |
613 | packet_desc->bPacketType = WA_XFER_ISO_PACKET_INFO; | |
614 | packet_desc->wLength = cpu_to_le16(sizeof(*packet_desc) + | |
615 | (sizeof(packet_desc->PacketLength[0]) * | |
616 | seg->isoc_frame_count)); | |
617 | for (frame_index = 0; frame_index < seg->isoc_frame_count; | |
618 | ++frame_index) { | |
619 | int offset_index = frame_index + seg->isoc_frame_offset; | |
620 | packet_desc->PacketLength[frame_index] = | |
621 | cpu_to_le16(iso_frame_desc[offset_index].length); | |
622 | } | |
623 | } | |
624 | ||
625 | ||
bce83697 | 626 | /* Fill in the common request header and xfer-type specific data. */ |
df365423 IPG |
627 | static void __wa_xfer_setup_hdr0(struct wa_xfer *xfer, |
628 | struct wa_xfer_hdr *xfer_hdr0, | |
629 | enum wa_xfer_type xfer_type, | |
630 | size_t xfer_hdr_size) | |
631 | { | |
632 | struct wa_rpipe *rpipe = xfer->ep->hcpriv; | |
2101242c | 633 | struct wa_seg *seg = xfer->seg[0]; |
df365423 | 634 | |
2101242c | 635 | xfer_hdr0 = &seg->xfer_hdr; |
df365423 IPG |
636 | xfer_hdr0->bLength = xfer_hdr_size; |
637 | xfer_hdr0->bRequestType = xfer_type; | |
638 | xfer_hdr0->wRPipe = rpipe->descr.wRPipeIndex; | |
fdd160c3 | 639 | xfer_hdr0->dwTransferID = wa_xfer_id_le32(xfer); |
df365423 IPG |
640 | xfer_hdr0->bTransferSegment = 0; |
641 | switch (xfer_type) { | |
642 | case WA_XFER_TYPE_CTL: { | |
643 | struct wa_xfer_ctl *xfer_ctl = | |
644 | container_of(xfer_hdr0, struct wa_xfer_ctl, hdr); | |
645 | xfer_ctl->bmAttribute = xfer->is_inbound ? 1 : 0; | |
df365423 IPG |
646 | memcpy(&xfer_ctl->baSetupData, xfer->urb->setup_packet, |
647 | sizeof(xfer_ctl->baSetupData)); | |
648 | break; | |
649 | } | |
650 | case WA_XFER_TYPE_BI: | |
651 | break; | |
7a32d9be TP |
652 | case WA_XFER_TYPE_ISO: { |
653 | struct wa_xfer_hwaiso *xfer_iso = | |
654 | container_of(xfer_hdr0, struct wa_xfer_hwaiso, hdr); | |
655 | struct wa_xfer_packet_info_hwaiso *packet_desc = | |
656 | ((void *)xfer_iso) + xfer_hdr_size; | |
2101242c | 657 | |
7a32d9be | 658 | /* populate the isoc section of the transfer request. */ |
2101242c TP |
659 | xfer_iso->dwNumOfPackets = cpu_to_le32(seg->isoc_frame_count); |
660 | /* populate isoc packet descriptor. */ | |
661 | __wa_setup_isoc_packet_descr(packet_desc, xfer, seg); | |
7a32d9be TP |
662 | break; |
663 | } | |
df365423 IPG |
664 | default: |
665 | BUG(); | |
666 | }; | |
667 | } | |
668 | ||
669 | /* | |
670 | * Callback for the OUT data phase of the segment request | |
671 | * | |
09d94cbd | 672 | * Check wa_seg_tr_cb(); most comments also apply here because this |
df365423 IPG |
673 | * function does almost the same thing and they work closely |
674 | * together. | |
675 | * | |
25985edc | 676 | * If the seg request has failed but this DTO phase has succeeded, |
09d94cbd | 677 | * wa_seg_tr_cb() has already failed the segment and moved the |
df365423 IPG |
678 | * status to WA_SEG_ERROR, so this will go through 'case 0' and |
679 | * effectively do nothing. | |
680 | */ | |
681 | static void wa_seg_dto_cb(struct urb *urb) | |
682 | { | |
683 | struct wa_seg *seg = urb->context; | |
684 | struct wa_xfer *xfer = seg->xfer; | |
685 | struct wahc *wa; | |
686 | struct device *dev; | |
687 | struct wa_rpipe *rpipe; | |
688 | unsigned long flags; | |
689 | unsigned rpipe_ready = 0; | |
2101242c | 690 | int data_send_done = 1, release_dto = 0, holding_dto = 0; |
df365423 | 691 | u8 done = 0; |
2101242c | 692 | int result; |
df365423 | 693 | |
d5b5c9f2 TP |
694 | /* free the sg if it was used. */ |
695 | kfree(urb->sg); | |
696 | urb->sg = NULL; | |
697 | ||
2101242c TP |
698 | spin_lock_irqsave(&xfer->lock, flags); |
699 | wa = xfer->wa; | |
700 | dev = &wa->usb_iface->dev; | |
701 | if (usb_pipeisoc(xfer->urb->pipe)) { | |
f07ddb9e TP |
702 | /* Alereon HWA sends all isoc frames in a single transfer. */ |
703 | if (wa->quirks & WUSB_QUIRK_ALEREON_HWA_CONCAT_ISOC) | |
704 | xfer->dto_isoc_frame_index += seg->isoc_frame_count; | |
705 | else | |
706 | xfer->dto_isoc_frame_index += 1; | |
2101242c TP |
707 | if (xfer->dto_isoc_frame_index < seg->isoc_frame_count) { |
708 | data_send_done = 0; | |
709 | holding_dto = 1; /* checked in error cases. */ | |
710 | /* | |
711 | * if this is the last isoc frame of the segment, we | |
712 | * can release DTO after sending this frame. | |
713 | */ | |
714 | if ((xfer->dto_isoc_frame_index + 1) >= | |
715 | seg->isoc_frame_count) | |
716 | release_dto = 1; | |
717 | } | |
718 | dev_dbg(dev, "xfer 0x%08X#%u: isoc frame = %d, holding_dto = %d, release_dto = %d.\n", | |
719 | wa_xfer_id(xfer), seg->index, | |
720 | xfer->dto_isoc_frame_index, holding_dto, release_dto); | |
721 | } | |
722 | spin_unlock_irqrestore(&xfer->lock, flags); | |
723 | ||
df365423 IPG |
724 | switch (urb->status) { |
725 | case 0: | |
726 | spin_lock_irqsave(&xfer->lock, flags); | |
2101242c TP |
727 | seg->result += urb->actual_length; |
728 | if (data_send_done) { | |
729 | dev_dbg(dev, "xfer 0x%08X#%u: data out done (%zu bytes)\n", | |
730 | wa_xfer_id(xfer), seg->index, seg->result); | |
731 | if (seg->status < WA_SEG_PENDING) | |
732 | seg->status = WA_SEG_PENDING; | |
733 | } else { | |
734 | /* should only hit this for isoc xfers. */ | |
735 | /* | |
736 | * Populate the dto URB with the next isoc frame buffer, | |
737 | * send the URB and release DTO if we no longer need it. | |
738 | */ | |
739 | __wa_populate_dto_urb_isoc(xfer, seg, | |
740 | seg->isoc_frame_offset + | |
741 | xfer->dto_isoc_frame_index); | |
742 | ||
743 | /* resubmit the URB with the next isoc frame. */ | |
744 | result = usb_submit_urb(seg->dto_urb, GFP_ATOMIC); | |
745 | if (result < 0) { | |
746 | dev_err(dev, "xfer 0x%08X#%u: DTO submit failed: %d\n", | |
747 | wa_xfer_id(xfer), seg->index, result); | |
748 | spin_unlock_irqrestore(&xfer->lock, flags); | |
749 | goto error_dto_submit; | |
750 | } | |
751 | } | |
df365423 | 752 | spin_unlock_irqrestore(&xfer->lock, flags); |
2101242c TP |
753 | if (release_dto) { |
754 | __wa_dto_put(wa); | |
755 | wa_check_for_delayed_rpipes(wa); | |
756 | } | |
df365423 IPG |
757 | break; |
758 | case -ECONNRESET: /* URB unlinked; no need to do anything */ | |
759 | case -ENOENT: /* as it was done by the who unlinked us */ | |
2101242c TP |
760 | if (holding_dto) { |
761 | __wa_dto_put(wa); | |
762 | wa_check_for_delayed_rpipes(wa); | |
763 | } | |
df365423 IPG |
764 | break; |
765 | default: /* Other errors ... */ | |
2101242c TP |
766 | dev_err(dev, "xfer 0x%08X#%u: data out error %d\n", |
767 | wa_xfer_id(xfer), seg->index, urb->status); | |
768 | goto error_default; | |
769 | } | |
770 | ||
771 | return; | |
772 | ||
773 | error_dto_submit: | |
774 | error_default: | |
775 | spin_lock_irqsave(&xfer->lock, flags); | |
776 | rpipe = xfer->ep->hcpriv; | |
777 | if (edc_inc(&wa->nep_edc, EDC_MAX_ERRORS, | |
778 | EDC_ERROR_TIMEFRAME)){ | |
779 | dev_err(dev, "DTO: URB max acceptable errors exceeded, resetting device\n"); | |
780 | wa_reset_all(wa); | |
781 | } | |
782 | if (seg->status != WA_SEG_ERROR) { | |
783 | seg->status = WA_SEG_ERROR; | |
784 | seg->result = urb->status; | |
785 | xfer->segs_done++; | |
786 | __wa_xfer_abort(xfer); | |
787 | rpipe_ready = rpipe_avail_inc(rpipe); | |
788 | done = __wa_xfer_is_done(xfer); | |
df365423 | 789 | } |
2101242c TP |
790 | spin_unlock_irqrestore(&xfer->lock, flags); |
791 | if (holding_dto) { | |
792 | __wa_dto_put(wa); | |
793 | wa_check_for_delayed_rpipes(wa); | |
794 | } | |
795 | if (done) | |
796 | wa_xfer_completion(xfer); | |
797 | if (rpipe_ready) | |
798 | wa_xfer_delayed_run(rpipe); | |
799 | ||
df365423 IPG |
800 | } |
801 | ||
7a32d9be TP |
802 | /* |
803 | * Callback for the isoc packet descriptor phase of the segment request | |
804 | * | |
805 | * Check wa_seg_tr_cb(); most comments also apply here because this | |
806 | * function does almost the same thing and they work closely | |
807 | * together. | |
808 | * | |
809 | * If the seg request has failed but this phase has succeeded, | |
810 | * wa_seg_tr_cb() has already failed the segment and moved the | |
811 | * status to WA_SEG_ERROR, so this will go through 'case 0' and | |
812 | * effectively do nothing. | |
813 | */ | |
814 | static void wa_seg_iso_pack_desc_cb(struct urb *urb) | |
815 | { | |
816 | struct wa_seg *seg = urb->context; | |
817 | struct wa_xfer *xfer = seg->xfer; | |
818 | struct wahc *wa; | |
819 | struct device *dev; | |
820 | struct wa_rpipe *rpipe; | |
821 | unsigned long flags; | |
822 | unsigned rpipe_ready = 0; | |
823 | u8 done = 0; | |
824 | ||
825 | switch (urb->status) { | |
826 | case 0: | |
827 | spin_lock_irqsave(&xfer->lock, flags); | |
828 | wa = xfer->wa; | |
829 | dev = &wa->usb_iface->dev; | |
2101242c TP |
830 | dev_dbg(dev, "iso xfer %08X#%u: packet descriptor done\n", |
831 | wa_xfer_id(xfer), seg->index); | |
7a32d9be TP |
832 | if (xfer->is_inbound && seg->status < WA_SEG_PENDING) |
833 | seg->status = WA_SEG_PENDING; | |
834 | spin_unlock_irqrestore(&xfer->lock, flags); | |
835 | break; | |
836 | case -ECONNRESET: /* URB unlinked; no need to do anything */ | |
837 | case -ENOENT: /* as it was done by the who unlinked us */ | |
838 | break; | |
839 | default: /* Other errors ... */ | |
840 | spin_lock_irqsave(&xfer->lock, flags); | |
841 | wa = xfer->wa; | |
842 | dev = &wa->usb_iface->dev; | |
843 | rpipe = xfer->ep->hcpriv; | |
2101242c TP |
844 | pr_err_ratelimited("iso xfer %08X#%u: packet descriptor error %d\n", |
845 | wa_xfer_id(xfer), seg->index, urb->status); | |
7a32d9be TP |
846 | if (edc_inc(&wa->nep_edc, EDC_MAX_ERRORS, |
847 | EDC_ERROR_TIMEFRAME)){ | |
848 | dev_err(dev, "DTO: URB max acceptable errors exceeded, resetting device\n"); | |
849 | wa_reset_all(wa); | |
850 | } | |
851 | if (seg->status != WA_SEG_ERROR) { | |
852 | usb_unlink_urb(seg->dto_urb); | |
853 | seg->status = WA_SEG_ERROR; | |
854 | seg->result = urb->status; | |
855 | xfer->segs_done++; | |
856 | __wa_xfer_abort(xfer); | |
857 | rpipe_ready = rpipe_avail_inc(rpipe); | |
858 | done = __wa_xfer_is_done(xfer); | |
859 | } | |
860 | spin_unlock_irqrestore(&xfer->lock, flags); | |
861 | if (done) | |
862 | wa_xfer_completion(xfer); | |
863 | if (rpipe_ready) | |
864 | wa_xfer_delayed_run(rpipe); | |
865 | } | |
866 | } | |
867 | ||
df365423 IPG |
868 | /* |
869 | * Callback for the segment request | |
870 | * | |
af901ca1 | 871 | * If successful transition state (unless already transitioned or |
df365423 IPG |
872 | * outbound transfer); otherwise, take a note of the error, mark this |
873 | * segment done and try completion. | |
874 | * | |
875 | * Note we don't access until we are sure that the transfer hasn't | |
876 | * been cancelled (ECONNRESET, ENOENT), which could mean that | |
877 | * seg->xfer could be already gone. | |
878 | * | |
879 | * We have to check before setting the status to WA_SEG_PENDING | |
880 | * because sometimes the xfer result callback arrives before this | |
881 | * callback (geeeeeeze), so it might happen that we are already in | |
7a32d9be | 882 | * another state. As well, we don't set it if the transfer is not inbound, |
df365423 IPG |
883 | * as in that case, wa_seg_dto_cb will do it when the OUT data phase |
884 | * finishes. | |
885 | */ | |
09d94cbd | 886 | static void wa_seg_tr_cb(struct urb *urb) |
df365423 IPG |
887 | { |
888 | struct wa_seg *seg = urb->context; | |
889 | struct wa_xfer *xfer = seg->xfer; | |
890 | struct wahc *wa; | |
891 | struct device *dev; | |
892 | struct wa_rpipe *rpipe; | |
893 | unsigned long flags; | |
894 | unsigned rpipe_ready; | |
895 | u8 done = 0; | |
896 | ||
df365423 IPG |
897 | switch (urb->status) { |
898 | case 0: | |
899 | spin_lock_irqsave(&xfer->lock, flags); | |
900 | wa = xfer->wa; | |
901 | dev = &wa->usb_iface->dev; | |
7a32d9be TP |
902 | dev_dbg(dev, "xfer %p ID 0x%08X#%u: request done\n", |
903 | xfer, wa_xfer_id(xfer), seg->index); | |
904 | if (xfer->is_inbound && | |
905 | seg->status < WA_SEG_PENDING && | |
906 | !(usb_pipeisoc(xfer->urb->pipe))) | |
df365423 IPG |
907 | seg->status = WA_SEG_PENDING; |
908 | spin_unlock_irqrestore(&xfer->lock, flags); | |
909 | break; | |
910 | case -ECONNRESET: /* URB unlinked; no need to do anything */ | |
911 | case -ENOENT: /* as it was done by the who unlinked us */ | |
912 | break; | |
913 | default: /* Other errors ... */ | |
914 | spin_lock_irqsave(&xfer->lock, flags); | |
915 | wa = xfer->wa; | |
916 | dev = &wa->usb_iface->dev; | |
917 | rpipe = xfer->ep->hcpriv; | |
918 | if (printk_ratelimit()) | |
b9c84be6 TP |
919 | dev_err(dev, "xfer %p ID 0x%08X#%u: request error %d\n", |
920 | xfer, wa_xfer_id(xfer), seg->index, | |
921 | urb->status); | |
df365423 IPG |
922 | if (edc_inc(&wa->nep_edc, EDC_MAX_ERRORS, |
923 | EDC_ERROR_TIMEFRAME)){ | |
924 | dev_err(dev, "DTO: URB max acceptable errors " | |
925 | "exceeded, resetting device\n"); | |
926 | wa_reset_all(wa); | |
927 | } | |
7a32d9be | 928 | usb_unlink_urb(seg->isoc_pack_desc_urb); |
df365423 IPG |
929 | usb_unlink_urb(seg->dto_urb); |
930 | seg->status = WA_SEG_ERROR; | |
931 | seg->result = urb->status; | |
932 | xfer->segs_done++; | |
933 | __wa_xfer_abort(xfer); | |
934 | rpipe_ready = rpipe_avail_inc(rpipe); | |
935 | done = __wa_xfer_is_done(xfer); | |
936 | spin_unlock_irqrestore(&xfer->lock, flags); | |
937 | if (done) | |
938 | wa_xfer_completion(xfer); | |
939 | if (rpipe_ready) | |
940 | wa_xfer_delayed_run(rpipe); | |
941 | } | |
df365423 IPG |
942 | } |
943 | ||
ffd6d17d TP |
944 | /* |
945 | * Allocate an SG list to store bytes_to_transfer bytes and copy the | |
2b81c083 | 946 | * subset of the in_sg that matches the buffer subset |
ffd6d17d TP |
947 | * we are about to transfer. |
948 | */ | |
2b81c083 TP |
949 | static struct scatterlist *wa_xfer_create_subset_sg(struct scatterlist *in_sg, |
950 | const unsigned int bytes_transferred, | |
951 | const unsigned int bytes_to_transfer, unsigned int *out_num_sgs) | |
952 | { | |
953 | struct scatterlist *out_sg; | |
954 | unsigned int bytes_processed = 0, offset_into_current_page_data = 0, | |
955 | nents; | |
956 | struct scatterlist *current_xfer_sg = in_sg; | |
957 | struct scatterlist *current_seg_sg, *last_seg_sg; | |
958 | ||
959 | /* skip previously transferred pages. */ | |
960 | while ((current_xfer_sg) && | |
961 | (bytes_processed < bytes_transferred)) { | |
962 | bytes_processed += current_xfer_sg->length; | |
963 | ||
964 | /* advance the sg if current segment starts on or past the | |
965 | next page. */ | |
966 | if (bytes_processed <= bytes_transferred) | |
967 | current_xfer_sg = sg_next(current_xfer_sg); | |
968 | } | |
969 | ||
970 | /* the data for the current segment starts in current_xfer_sg. | |
971 | calculate the offset. */ | |
972 | if (bytes_processed > bytes_transferred) { | |
973 | offset_into_current_page_data = current_xfer_sg->length - | |
974 | (bytes_processed - bytes_transferred); | |
975 | } | |
976 | ||
977 | /* calculate the number of pages needed by this segment. */ | |
978 | nents = DIV_ROUND_UP((bytes_to_transfer + | |
979 | offset_into_current_page_data + | |
980 | current_xfer_sg->offset), | |
981 | PAGE_SIZE); | |
982 | ||
983 | out_sg = kmalloc((sizeof(struct scatterlist) * nents), GFP_ATOMIC); | |
984 | if (out_sg) { | |
985 | sg_init_table(out_sg, nents); | |
986 | ||
987 | /* copy the portion of the incoming SG that correlates to the | |
988 | * data to be transferred by this segment to the segment SG. */ | |
989 | last_seg_sg = current_seg_sg = out_sg; | |
990 | bytes_processed = 0; | |
991 | ||
992 | /* reset nents and calculate the actual number of sg entries | |
993 | needed. */ | |
994 | nents = 0; | |
995 | while ((bytes_processed < bytes_to_transfer) && | |
996 | current_seg_sg && current_xfer_sg) { | |
997 | unsigned int page_len = min((current_xfer_sg->length - | |
998 | offset_into_current_page_data), | |
999 | (bytes_to_transfer - bytes_processed)); | |
1000 | ||
1001 | sg_set_page(current_seg_sg, sg_page(current_xfer_sg), | |
1002 | page_len, | |
1003 | current_xfer_sg->offset + | |
1004 | offset_into_current_page_data); | |
1005 | ||
1006 | bytes_processed += page_len; | |
1007 | ||
1008 | last_seg_sg = current_seg_sg; | |
1009 | current_seg_sg = sg_next(current_seg_sg); | |
1010 | current_xfer_sg = sg_next(current_xfer_sg); | |
1011 | ||
1012 | /* only the first page may require additional offset. */ | |
1013 | offset_into_current_page_data = 0; | |
1014 | nents++; | |
1015 | } | |
1016 | ||
1017 | /* update num_sgs and terminate the list since we may have | |
1018 | * concatenated pages. */ | |
1019 | sg_mark_end(last_seg_sg); | |
1020 | *out_num_sgs = nents; | |
1021 | } | |
1022 | ||
1023 | return out_sg; | |
1024 | } | |
1025 | ||
7a32d9be TP |
1026 | /* |
1027 | * Populate DMA buffer info for the isoc dto urb. | |
1028 | */ | |
2101242c TP |
1029 | static void __wa_populate_dto_urb_isoc(struct wa_xfer *xfer, |
1030 | struct wa_seg *seg, int curr_iso_frame) | |
7a32d9be | 1031 | { |
7a32d9be TP |
1032 | seg->dto_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
1033 | seg->dto_urb->sg = NULL; | |
1034 | seg->dto_urb->num_sgs = 0; | |
f07ddb9e TP |
1035 | /* dto urb buffer address pulled from iso_frame_desc. */ |
1036 | seg->dto_urb->transfer_dma = xfer->urb->transfer_dma + | |
1037 | xfer->urb->iso_frame_desc[curr_iso_frame].offset; | |
1038 | /* The Alereon HWA sends a single URB with all isoc segs. */ | |
1039 | if (xfer->wa->quirks & WUSB_QUIRK_ALEREON_HWA_CONCAT_ISOC) | |
1040 | seg->dto_urb->transfer_buffer_length = seg->isoc_size; | |
1041 | else | |
1042 | seg->dto_urb->transfer_buffer_length = | |
1043 | xfer->urb->iso_frame_desc[curr_iso_frame].length; | |
7a32d9be TP |
1044 | } |
1045 | ||
ffd6d17d TP |
1046 | /* |
1047 | * Populate buffer ptr and size, DMA buffer or SG list for the dto urb. | |
1048 | */ | |
1049 | static int __wa_populate_dto_urb(struct wa_xfer *xfer, | |
1050 | struct wa_seg *seg, size_t buf_itr_offset, size_t buf_itr_size) | |
1051 | { | |
1052 | int result = 0; | |
1053 | ||
1054 | if (xfer->is_dma) { | |
1055 | seg->dto_urb->transfer_dma = | |
1056 | xfer->urb->transfer_dma + buf_itr_offset; | |
1057 | seg->dto_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
1058 | seg->dto_urb->sg = NULL; | |
1059 | seg->dto_urb->num_sgs = 0; | |
1060 | } else { | |
1061 | /* do buffer or SG processing. */ | |
1062 | seg->dto_urb->transfer_flags &= | |
1063 | ~URB_NO_TRANSFER_DMA_MAP; | |
1064 | /* this should always be 0 before a resubmit. */ | |
1065 | seg->dto_urb->num_mapped_sgs = 0; | |
1066 | ||
1067 | if (xfer->urb->transfer_buffer) { | |
1068 | seg->dto_urb->transfer_buffer = | |
1069 | xfer->urb->transfer_buffer + | |
1070 | buf_itr_offset; | |
1071 | seg->dto_urb->sg = NULL; | |
1072 | seg->dto_urb->num_sgs = 0; | |
1073 | } else { | |
1074 | seg->dto_urb->transfer_buffer = NULL; | |
1075 | ||
1076 | /* | |
1077 | * allocate an SG list to store seg_size bytes | |
1078 | * and copy the subset of the xfer->urb->sg that | |
1079 | * matches the buffer subset we are about to | |
1080 | * read. | |
1081 | */ | |
1082 | seg->dto_urb->sg = wa_xfer_create_subset_sg( | |
1083 | xfer->urb->sg, | |
1084 | buf_itr_offset, buf_itr_size, | |
1085 | &(seg->dto_urb->num_sgs)); | |
1086 | if (!(seg->dto_urb->sg)) | |
1087 | result = -ENOMEM; | |
1088 | } | |
1089 | } | |
1090 | seg->dto_urb->transfer_buffer_length = buf_itr_size; | |
1091 | ||
1092 | return result; | |
1093 | } | |
1094 | ||
df365423 IPG |
1095 | /* |
1096 | * Allocate the segs array and initialize each of them | |
1097 | * | |
1098 | * The segments are freed by wa_xfer_destroy() when the xfer use count | |
1099 | * drops to zero; however, because each segment is given the same life | |
1100 | * cycle as the USB URB it contains, it is actually freed by | |
1101 | * usb_put_urb() on the contained USB URB (twisted, eh?). | |
1102 | */ | |
1103 | static int __wa_xfer_setup_segs(struct wa_xfer *xfer, size_t xfer_hdr_size) | |
1104 | { | |
2101242c | 1105 | int result, cnt, iso_frame_offset; |
df365423 IPG |
1106 | size_t alloc_size = sizeof(*xfer->seg[0]) |
1107 | - sizeof(xfer->seg[0]->xfer_hdr) + xfer_hdr_size; | |
1108 | struct usb_device *usb_dev = xfer->wa->usb_dev; | |
1109 | const struct usb_endpoint_descriptor *dto_epd = xfer->wa->dto_epd; | |
1110 | struct wa_seg *seg; | |
2101242c TP |
1111 | size_t buf_itr, buf_size, buf_itr_size; |
1112 | int xfer_isoc_frame_offset = 0; | |
df365423 IPG |
1113 | |
1114 | result = -ENOMEM; | |
92c4d9bd | 1115 | xfer->seg = kcalloc(xfer->segs, sizeof(xfer->seg[0]), GFP_ATOMIC); |
df365423 IPG |
1116 | if (xfer->seg == NULL) |
1117 | goto error_segs_kzalloc; | |
1118 | buf_itr = 0; | |
1119 | buf_size = xfer->urb->transfer_buffer_length; | |
2101242c TP |
1120 | iso_frame_offset = 0; |
1121 | for (cnt = 0; cnt < xfer->segs; cnt++) { | |
1122 | size_t iso_pkt_descr_size = 0; | |
1123 | int seg_isoc_frame_count = 0, seg_isoc_size = 0; | |
7a32d9be | 1124 | |
2101242c TP |
1125 | if (usb_pipeisoc(xfer->urb->pipe)) { |
1126 | seg_isoc_frame_count = | |
1127 | __wa_seg_calculate_isoc_frame_count(xfer, | |
1128 | xfer_isoc_frame_offset, &seg_isoc_size); | |
7a32d9be | 1129 | |
2101242c TP |
1130 | iso_pkt_descr_size = |
1131 | sizeof(struct wa_xfer_packet_info_hwaiso) + | |
1132 | (seg_isoc_frame_count * sizeof(__le16)); | |
1133 | } | |
1134 | seg = xfer->seg[cnt] = kmalloc(alloc_size + iso_pkt_descr_size, | |
1135 | GFP_ATOMIC); | |
df365423 | 1136 | if (seg == NULL) |
66591015 | 1137 | goto error_seg_kmalloc; |
df365423 IPG |
1138 | wa_seg_init(seg); |
1139 | seg->xfer = xfer; | |
1140 | seg->index = cnt; | |
2101242c TP |
1141 | seg->isoc_frame_count = seg_isoc_frame_count; |
1142 | seg->isoc_frame_offset = xfer_isoc_frame_offset; | |
1143 | seg->isoc_size = seg_isoc_size; | |
09d94cbd | 1144 | usb_fill_bulk_urb(&seg->tr_urb, usb_dev, |
df365423 IPG |
1145 | usb_sndbulkpipe(usb_dev, |
1146 | dto_epd->bEndpointAddress), | |
1147 | &seg->xfer_hdr, xfer_hdr_size, | |
09d94cbd | 1148 | wa_seg_tr_cb, seg); |
2b81c083 | 1149 | buf_itr_size = min(buf_size, xfer->seg_size); |
df365423 | 1150 | if (xfer->is_inbound == 0 && buf_size > 0) { |
2b81c083 | 1151 | /* outbound data. */ |
df365423 IPG |
1152 | seg->dto_urb = usb_alloc_urb(0, GFP_ATOMIC); |
1153 | if (seg->dto_urb == NULL) | |
1154 | goto error_dto_alloc; | |
1155 | usb_fill_bulk_urb( | |
1156 | seg->dto_urb, usb_dev, | |
1157 | usb_sndbulkpipe(usb_dev, | |
1158 | dto_epd->bEndpointAddress), | |
1159 | NULL, 0, wa_seg_dto_cb, seg); | |
ffd6d17d | 1160 | |
7a32d9be TP |
1161 | if (usb_pipeisoc(xfer->urb->pipe)) { |
1162 | /* iso packet descriptor. */ | |
1163 | seg->isoc_pack_desc_urb = | |
1164 | usb_alloc_urb(0, GFP_ATOMIC); | |
1165 | if (seg->isoc_pack_desc_urb == NULL) | |
1166 | goto error_iso_pack_desc_alloc; | |
1167 | /* | |
1168 | * The buffer for the isoc packet descriptor | |
1169 | * after the transfer request header in the | |
1170 | * segment object memory buffer. | |
1171 | */ | |
1172 | usb_fill_bulk_urb( | |
1173 | seg->isoc_pack_desc_urb, usb_dev, | |
1174 | usb_sndbulkpipe(usb_dev, | |
1175 | dto_epd->bEndpointAddress), | |
1176 | (void *)(&seg->xfer_hdr) + | |
1177 | xfer_hdr_size, | |
1178 | iso_pkt_descr_size, | |
1179 | wa_seg_iso_pack_desc_cb, seg); | |
ffd6d17d | 1180 | |
2101242c TP |
1181 | /* |
1182 | * Fill in the xfer buffer information for the | |
1183 | * first isoc frame. Subsequent frames in this | |
1184 | * segment will be filled in and sent from the | |
1185 | * DTO completion routine, if needed. | |
1186 | */ | |
1187 | __wa_populate_dto_urb_isoc(xfer, seg, | |
1188 | xfer_isoc_frame_offset); | |
1189 | /* adjust starting frame offset for next seg. */ | |
1190 | xfer_isoc_frame_offset += seg_isoc_frame_count; | |
7a32d9be TP |
1191 | } else { |
1192 | /* fill in the xfer buffer information. */ | |
1193 | result = __wa_populate_dto_urb(xfer, seg, | |
1194 | buf_itr, buf_itr_size); | |
1195 | if (result < 0) | |
1196 | goto error_seg_outbound_populate; | |
1197 | ||
1198 | buf_itr += buf_itr_size; | |
1199 | buf_size -= buf_itr_size; | |
1200 | } | |
df365423 IPG |
1201 | } |
1202 | seg->status = WA_SEG_READY; | |
df365423 IPG |
1203 | } |
1204 | return 0; | |
1205 | ||
ffd6d17d TP |
1206 | /* |
1207 | * Free the memory for the current segment which failed to init. | |
1208 | * Use the fact that cnt is left at were it failed. The remaining | |
1209 | * segments will be cleaned up by wa_xfer_destroy. | |
1210 | */ | |
7a32d9be | 1211 | error_iso_pack_desc_alloc: |
ffd6d17d | 1212 | error_seg_outbound_populate: |
11b1bf81 | 1213 | usb_free_urb(xfer->seg[cnt]->dto_urb); |
df365423 IPG |
1214 | error_dto_alloc: |
1215 | kfree(xfer->seg[cnt]); | |
ffd6d17d | 1216 | xfer->seg[cnt] = NULL; |
66591015 | 1217 | error_seg_kmalloc: |
df365423 IPG |
1218 | error_segs_kzalloc: |
1219 | return result; | |
1220 | } | |
1221 | ||
1222 | /* | |
1223 | * Allocates all the stuff needed to submit a transfer | |
1224 | * | |
1225 | * Breaks the whole data buffer in a list of segments, each one has a | |
1226 | * structure allocated to it and linked in xfer->seg[index] | |
1227 | * | |
1228 | * FIXME: merge setup_segs() and the last part of this function, no | |
1229 | * need to do two for loops when we could run everything in a | |
1230 | * single one | |
1231 | */ | |
1232 | static int __wa_xfer_setup(struct wa_xfer *xfer, struct urb *urb) | |
1233 | { | |
1234 | int result; | |
1235 | struct device *dev = &xfer->wa->usb_iface->dev; | |
1236 | enum wa_xfer_type xfer_type = 0; /* shut up GCC */ | |
1237 | size_t xfer_hdr_size, cnt, transfer_size; | |
1238 | struct wa_xfer_hdr *xfer_hdr0, *xfer_hdr; | |
1239 | ||
df365423 IPG |
1240 | result = __wa_xfer_setup_sizes(xfer, &xfer_type); |
1241 | if (result < 0) | |
1242 | goto error_setup_sizes; | |
1243 | xfer_hdr_size = result; | |
1244 | result = __wa_xfer_setup_segs(xfer, xfer_hdr_size); | |
1245 | if (result < 0) { | |
1246 | dev_err(dev, "xfer %p: Failed to allocate %d segments: %d\n", | |
1247 | xfer, xfer->segs, result); | |
1248 | goto error_setup_segs; | |
1249 | } | |
1250 | /* Fill the first header */ | |
1251 | xfer_hdr0 = &xfer->seg[0]->xfer_hdr; | |
1252 | wa_xfer_id_init(xfer); | |
1253 | __wa_xfer_setup_hdr0(xfer, xfer_hdr0, xfer_type, xfer_hdr_size); | |
1254 | ||
7a32d9be | 1255 | /* Fill remaining headers */ |
df365423 | 1256 | xfer_hdr = xfer_hdr0; |
7a32d9be TP |
1257 | if (xfer_type == WA_XFER_TYPE_ISO) { |
1258 | xfer_hdr0->dwTransferLength = | |
2101242c | 1259 | cpu_to_le32(xfer->seg[0]->isoc_size); |
7a32d9be | 1260 | for (cnt = 1; cnt < xfer->segs; cnt++) { |
7a32d9be | 1261 | struct wa_xfer_packet_info_hwaiso *packet_desc; |
2101242c | 1262 | struct wa_seg *seg = xfer->seg[cnt]; |
7a32d9be | 1263 | |
2101242c | 1264 | xfer_hdr = &seg->xfer_hdr; |
7a32d9be TP |
1265 | packet_desc = ((void *)xfer_hdr) + xfer_hdr_size; |
1266 | /* | |
2101242c TP |
1267 | * Copy values from the 0th header. Segment specific |
1268 | * values are set below. | |
7a32d9be | 1269 | */ |
2101242c | 1270 | memcpy(xfer_hdr, xfer_hdr0, xfer_hdr_size); |
7a32d9be TP |
1271 | xfer_hdr->bTransferSegment = cnt; |
1272 | xfer_hdr->dwTransferLength = | |
2101242c TP |
1273 | cpu_to_le32(seg->isoc_size); |
1274 | __wa_setup_isoc_packet_descr(packet_desc, xfer, seg); | |
1275 | seg->status = WA_SEG_READY; | |
7a32d9be TP |
1276 | } |
1277 | } else { | |
1278 | transfer_size = urb->transfer_buffer_length; | |
1279 | xfer_hdr0->dwTransferLength = transfer_size > xfer->seg_size ? | |
1280 | cpu_to_le32(xfer->seg_size) : | |
1281 | cpu_to_le32(transfer_size); | |
df365423 | 1282 | transfer_size -= xfer->seg_size; |
7a32d9be TP |
1283 | for (cnt = 1; cnt < xfer->segs; cnt++) { |
1284 | xfer_hdr = &xfer->seg[cnt]->xfer_hdr; | |
1285 | memcpy(xfer_hdr, xfer_hdr0, xfer_hdr_size); | |
1286 | xfer_hdr->bTransferSegment = cnt; | |
1287 | xfer_hdr->dwTransferLength = | |
1288 | transfer_size > xfer->seg_size ? | |
1289 | cpu_to_le32(xfer->seg_size) | |
1290 | : cpu_to_le32(transfer_size); | |
1291 | xfer->seg[cnt]->status = WA_SEG_READY; | |
1292 | transfer_size -= xfer->seg_size; | |
1293 | } | |
df365423 IPG |
1294 | } |
1295 | xfer_hdr->bTransferSegment |= 0x80; /* this is the last segment */ | |
1296 | result = 0; | |
1297 | error_setup_segs: | |
1298 | error_setup_sizes: | |
df365423 IPG |
1299 | return result; |
1300 | } | |
1301 | ||
1302 | /* | |
1303 | * | |
1304 | * | |
1305 | * rpipe->seg_lock is held! | |
1306 | */ | |
1307 | static int __wa_seg_submit(struct wa_rpipe *rpipe, struct wa_xfer *xfer, | |
679ee475 | 1308 | struct wa_seg *seg, int *dto_done) |
df365423 IPG |
1309 | { |
1310 | int result; | |
679ee475 TP |
1311 | |
1312 | /* default to done unless we encounter a multi-frame isoc segment. */ | |
1313 | *dto_done = 1; | |
1314 | ||
09d94cbd TP |
1315 | /* submit the transfer request. */ |
1316 | result = usb_submit_urb(&seg->tr_urb, GFP_ATOMIC); | |
df365423 | 1317 | if (result < 0) { |
7a32d9be TP |
1318 | pr_err("%s: xfer %p#%u: REQ submit failed: %d\n", |
1319 | __func__, xfer, seg->index, result); | |
df365423 IPG |
1320 | goto error_seg_submit; |
1321 | } | |
7a32d9be TP |
1322 | /* submit the isoc packet descriptor if present. */ |
1323 | if (seg->isoc_pack_desc_urb) { | |
f07ddb9e TP |
1324 | struct wahc *wa = xfer->wa; |
1325 | ||
7a32d9be TP |
1326 | result = usb_submit_urb(seg->isoc_pack_desc_urb, GFP_ATOMIC); |
1327 | if (result < 0) { | |
1328 | pr_err("%s: xfer %p#%u: ISO packet descriptor submit failed: %d\n", | |
1329 | __func__, xfer, seg->index, result); | |
1330 | goto error_iso_pack_desc_submit; | |
1331 | } | |
2101242c TP |
1332 | xfer->dto_isoc_frame_index = 0; |
1333 | /* | |
1334 | * If this segment contains more than one isoc frame, hold | |
1335 | * onto the dto resource until we send all frames. | |
f07ddb9e | 1336 | * Only applies to non-Alereon devices. |
2101242c | 1337 | */ |
f07ddb9e TP |
1338 | if (((wa->quirks & WUSB_QUIRK_ALEREON_HWA_CONCAT_ISOC) == 0) |
1339 | && (seg->isoc_frame_count > 1)) | |
2101242c | 1340 | *dto_done = 0; |
7a32d9be | 1341 | } |
09d94cbd | 1342 | /* submit the out data if this is an out request. */ |
df365423 IPG |
1343 | if (seg->dto_urb) { |
1344 | result = usb_submit_urb(seg->dto_urb, GFP_ATOMIC); | |
1345 | if (result < 0) { | |
7a32d9be TP |
1346 | pr_err("%s: xfer %p#%u: DTO submit failed: %d\n", |
1347 | __func__, xfer, seg->index, result); | |
df365423 IPG |
1348 | goto error_dto_submit; |
1349 | } | |
1350 | } | |
1351 | seg->status = WA_SEG_SUBMITTED; | |
1352 | rpipe_avail_dec(rpipe); | |
1353 | return 0; | |
1354 | ||
1355 | error_dto_submit: | |
7a32d9be TP |
1356 | usb_unlink_urb(seg->isoc_pack_desc_urb); |
1357 | error_iso_pack_desc_submit: | |
09d94cbd | 1358 | usb_unlink_urb(&seg->tr_urb); |
df365423 IPG |
1359 | error_seg_submit: |
1360 | seg->status = WA_SEG_ERROR; | |
1361 | seg->result = result; | |
2101242c | 1362 | *dto_done = 1; |
df365423 IPG |
1363 | return result; |
1364 | } | |
1365 | ||
1366 | /* | |
679ee475 TP |
1367 | * Execute more queued request segments until the maximum concurrent allowed. |
1368 | * Return true if the DTO resource was acquired and released. | |
df365423 IPG |
1369 | * |
1370 | * The ugly unlock/lock sequence on the error path is needed as the | |
1371 | * xfer->lock normally nests the seg_lock and not viceversa. | |
df365423 | 1372 | */ |
679ee475 | 1373 | static int __wa_xfer_delayed_run(struct wa_rpipe *rpipe, int *dto_waiting) |
df365423 | 1374 | { |
679ee475 | 1375 | int result, dto_acquired = 0, dto_done = 0; |
df365423 IPG |
1376 | struct device *dev = &rpipe->wa->usb_iface->dev; |
1377 | struct wa_seg *seg; | |
1378 | struct wa_xfer *xfer; | |
1379 | unsigned long flags; | |
1380 | ||
679ee475 TP |
1381 | *dto_waiting = 0; |
1382 | ||
df365423 IPG |
1383 | spin_lock_irqsave(&rpipe->seg_lock, flags); |
1384 | while (atomic_read(&rpipe->segs_available) > 0 | |
679ee475 TP |
1385 | && !list_empty(&rpipe->seg_list) |
1386 | && (dto_acquired = __wa_dto_try_get(rpipe->wa))) { | |
e9a088fa | 1387 | seg = list_first_entry(&(rpipe->seg_list), struct wa_seg, |
df365423 IPG |
1388 | list_node); |
1389 | list_del(&seg->list_node); | |
1390 | xfer = seg->xfer; | |
679ee475 TP |
1391 | result = __wa_seg_submit(rpipe, xfer, seg, &dto_done); |
1392 | /* release the dto resource if this RPIPE is done with it. */ | |
1393 | if (dto_done) | |
1394 | __wa_dto_put(rpipe->wa); | |
b9c84be6 TP |
1395 | dev_dbg(dev, "xfer %p ID %08X#%u submitted from delayed [%d segments available] %d\n", |
1396 | xfer, wa_xfer_id(xfer), seg->index, | |
1397 | atomic_read(&rpipe->segs_available), result); | |
df365423 IPG |
1398 | if (unlikely(result < 0)) { |
1399 | spin_unlock_irqrestore(&rpipe->seg_lock, flags); | |
1400 | spin_lock_irqsave(&xfer->lock, flags); | |
1401 | __wa_xfer_abort(xfer); | |
1402 | xfer->segs_done++; | |
1403 | spin_unlock_irqrestore(&xfer->lock, flags); | |
1404 | spin_lock_irqsave(&rpipe->seg_lock, flags); | |
1405 | } | |
1406 | } | |
679ee475 TP |
1407 | /* |
1408 | * Mark this RPIPE as waiting if dto was not acquired, there are | |
1409 | * delayed segs and no active transfers to wake us up later. | |
1410 | */ | |
1411 | if (!dto_acquired && !list_empty(&rpipe->seg_list) | |
1412 | && (atomic_read(&rpipe->segs_available) == | |
1413 | le16_to_cpu(rpipe->descr.wRequests))) | |
1414 | *dto_waiting = 1; | |
1415 | ||
df365423 | 1416 | spin_unlock_irqrestore(&rpipe->seg_lock, flags); |
679ee475 TP |
1417 | |
1418 | return dto_done; | |
1419 | } | |
1420 | ||
1421 | static void wa_xfer_delayed_run(struct wa_rpipe *rpipe) | |
1422 | { | |
1423 | int dto_waiting; | |
1424 | int dto_done = __wa_xfer_delayed_run(rpipe, &dto_waiting); | |
1425 | ||
1426 | /* | |
1427 | * If this RPIPE is waiting on the DTO resource, add it to the tail of | |
1428 | * the waiting list. | |
1429 | * Otherwise, if the WA DTO resource was acquired and released by | |
1430 | * __wa_xfer_delayed_run, another RPIPE may have attempted to acquire | |
1431 | * DTO and failed during that time. Check the delayed list and process | |
1432 | * any waiters. Start searching from the next RPIPE index. | |
1433 | */ | |
1434 | if (dto_waiting) | |
1435 | wa_add_delayed_rpipe(rpipe->wa, rpipe); | |
1436 | else if (dto_done) | |
1437 | wa_check_for_delayed_rpipes(rpipe->wa); | |
df365423 IPG |
1438 | } |
1439 | ||
1440 | /* | |
1441 | * | |
1442 | * xfer->lock is taken | |
1443 | * | |
1444 | * On failure submitting we just stop submitting and return error; | |
1445 | * wa_urb_enqueue_b() will execute the completion path | |
1446 | */ | |
1447 | static int __wa_xfer_submit(struct wa_xfer *xfer) | |
1448 | { | |
679ee475 | 1449 | int result, dto_acquired = 0, dto_done = 0, dto_waiting = 0; |
df365423 IPG |
1450 | struct wahc *wa = xfer->wa; |
1451 | struct device *dev = &wa->usb_iface->dev; | |
1452 | unsigned cnt; | |
1453 | struct wa_seg *seg; | |
1454 | unsigned long flags; | |
1455 | struct wa_rpipe *rpipe = xfer->ep->hcpriv; | |
1456 | size_t maxrequests = le16_to_cpu(rpipe->descr.wRequests); | |
1457 | u8 available; | |
1458 | u8 empty; | |
1459 | ||
df365423 IPG |
1460 | spin_lock_irqsave(&wa->xfer_list_lock, flags); |
1461 | list_add_tail(&xfer->list_node, &wa->xfer_list); | |
1462 | spin_unlock_irqrestore(&wa->xfer_list_lock, flags); | |
1463 | ||
1464 | BUG_ON(atomic_read(&rpipe->segs_available) > maxrequests); | |
1465 | result = 0; | |
1466 | spin_lock_irqsave(&rpipe->seg_lock, flags); | |
1467 | for (cnt = 0; cnt < xfer->segs; cnt++) { | |
679ee475 TP |
1468 | int delay_seg = 1; |
1469 | ||
df365423 IPG |
1470 | available = atomic_read(&rpipe->segs_available); |
1471 | empty = list_empty(&rpipe->seg_list); | |
1472 | seg = xfer->seg[cnt]; | |
679ee475 TP |
1473 | if (available && empty) { |
1474 | /* | |
1475 | * Only attempt to acquire DTO if we have a segment | |
1476 | * to send. | |
1477 | */ | |
1478 | dto_acquired = __wa_dto_try_get(rpipe->wa); | |
1479 | if (dto_acquired) { | |
1480 | delay_seg = 0; | |
1481 | result = __wa_seg_submit(rpipe, xfer, seg, | |
1482 | &dto_done); | |
2101242c TP |
1483 | dev_dbg(dev, "xfer %p ID 0x%08X#%u: available %u empty %u submitted\n", |
1484 | xfer, wa_xfer_id(xfer), cnt, available, | |
1485 | empty); | |
679ee475 TP |
1486 | if (dto_done) |
1487 | __wa_dto_put(rpipe->wa); | |
1488 | ||
1489 | if (result < 0) { | |
1490 | __wa_xfer_abort(xfer); | |
1491 | goto error_seg_submit; | |
1492 | } | |
1493 | } | |
1494 | } | |
1495 | ||
1496 | if (delay_seg) { | |
2101242c TP |
1497 | dev_dbg(dev, "xfer %p ID 0x%08X#%u: available %u empty %u delayed\n", |
1498 | xfer, wa_xfer_id(xfer), cnt, available, empty); | |
df365423 IPG |
1499 | seg->status = WA_SEG_DELAYED; |
1500 | list_add_tail(&seg->list_node, &rpipe->seg_list); | |
df365423 IPG |
1501 | } |
1502 | xfer->segs_submitted++; | |
1503 | } | |
df365423 | 1504 | error_seg_submit: |
679ee475 TP |
1505 | /* |
1506 | * Mark this RPIPE as waiting if dto was not acquired, there are | |
1507 | * delayed segs and no active transfers to wake us up later. | |
1508 | */ | |
1509 | if (!dto_acquired && !list_empty(&rpipe->seg_list) | |
1510 | && (atomic_read(&rpipe->segs_available) == | |
1511 | le16_to_cpu(rpipe->descr.wRequests))) | |
1512 | dto_waiting = 1; | |
df365423 | 1513 | spin_unlock_irqrestore(&rpipe->seg_lock, flags); |
679ee475 TP |
1514 | |
1515 | if (dto_waiting) | |
1516 | wa_add_delayed_rpipe(rpipe->wa, rpipe); | |
1517 | else if (dto_done) | |
1518 | wa_check_for_delayed_rpipes(rpipe->wa); | |
1519 | ||
df365423 IPG |
1520 | return result; |
1521 | } | |
1522 | ||
1523 | /* | |
1524 | * Second part of a URB/transfer enqueuement | |
1525 | * | |
1526 | * Assumes this comes from wa_urb_enqueue() [maybe through | |
1527 | * wa_urb_enqueue_run()]. At this point: | |
1528 | * | |
1529 | * xfer->wa filled and refcounted | |
1530 | * xfer->ep filled with rpipe refcounted if | |
1531 | * delayed == 0 | |
1532 | * xfer->urb filled and refcounted (this is the case when called | |
1533 | * from wa_urb_enqueue() as we come from usb_submit_urb() | |
1534 | * and when called by wa_urb_enqueue_run(), as we took an | |
1535 | * extra ref dropped by _run() after we return). | |
1536 | * xfer->gfp filled | |
1537 | * | |
1538 | * If we fail at __wa_xfer_submit(), then we just check if we are done | |
1539 | * and if so, we run the completion procedure. However, if we are not | |
1540 | * yet done, we do nothing and wait for the completion handlers from | |
1541 | * the submitted URBs or from the xfer-result path to kick in. If xfer | |
1542 | * result never kicks in, the xfer will timeout from the USB code and | |
1543 | * dequeue() will be called. | |
1544 | */ | |
33186c44 | 1545 | static int wa_urb_enqueue_b(struct wa_xfer *xfer) |
df365423 IPG |
1546 | { |
1547 | int result; | |
1548 | unsigned long flags; | |
1549 | struct urb *urb = xfer->urb; | |
1550 | struct wahc *wa = xfer->wa; | |
1551 | struct wusbhc *wusbhc = wa->wusb; | |
df365423 IPG |
1552 | struct wusb_dev *wusb_dev; |
1553 | unsigned done; | |
1554 | ||
df365423 | 1555 | result = rpipe_get_by_ep(wa, xfer->ep, urb, xfer->gfp); |
33186c44 TP |
1556 | if (result < 0) { |
1557 | pr_err("%s: error_rpipe_get\n", __func__); | |
df365423 | 1558 | goto error_rpipe_get; |
33186c44 | 1559 | } |
df365423 IPG |
1560 | result = -ENODEV; |
1561 | /* FIXME: segmentation broken -- kills DWA */ | |
1562 | mutex_lock(&wusbhc->mutex); /* get a WUSB dev */ | |
49fa0921 JS |
1563 | if (urb->dev == NULL) { |
1564 | mutex_unlock(&wusbhc->mutex); | |
33186c44 | 1565 | pr_err("%s: error usb dev gone\n", __func__); |
df365423 | 1566 | goto error_dev_gone; |
49fa0921 | 1567 | } |
df365423 IPG |
1568 | wusb_dev = __wusb_dev_get_by_usb_dev(wusbhc, urb->dev); |
1569 | if (wusb_dev == NULL) { | |
1570 | mutex_unlock(&wusbhc->mutex); | |
bbfc3420 TP |
1571 | dev_err(&(urb->dev->dev), "%s: error wusb dev gone\n", |
1572 | __func__); | |
df365423 IPG |
1573 | goto error_dev_gone; |
1574 | } | |
1575 | mutex_unlock(&wusbhc->mutex); | |
1576 | ||
1577 | spin_lock_irqsave(&xfer->lock, flags); | |
1578 | xfer->wusb_dev = wusb_dev; | |
1579 | result = urb->status; | |
33186c44 | 1580 | if (urb->status != -EINPROGRESS) { |
bbfc3420 | 1581 | dev_err(&(urb->dev->dev), "%s: error_dequeued\n", __func__); |
df365423 | 1582 | goto error_dequeued; |
33186c44 | 1583 | } |
df365423 IPG |
1584 | |
1585 | result = __wa_xfer_setup(xfer, urb); | |
33186c44 | 1586 | if (result < 0) { |
bbfc3420 | 1587 | dev_err(&(urb->dev->dev), "%s: error_xfer_setup\n", __func__); |
df365423 | 1588 | goto error_xfer_setup; |
33186c44 | 1589 | } |
df365423 | 1590 | result = __wa_xfer_submit(xfer); |
33186c44 | 1591 | if (result < 0) { |
bbfc3420 | 1592 | dev_err(&(urb->dev->dev), "%s: error_xfer_submit\n", __func__); |
df365423 | 1593 | goto error_xfer_submit; |
33186c44 | 1594 | } |
df365423 | 1595 | spin_unlock_irqrestore(&xfer->lock, flags); |
33186c44 | 1596 | return 0; |
df365423 | 1597 | |
33186c44 TP |
1598 | /* |
1599 | * this is basically wa_xfer_completion() broken up wa_xfer_giveback() | |
1600 | * does a wa_xfer_put() that will call wa_xfer_destroy() and undo | |
1601 | * setup(). | |
df365423 IPG |
1602 | */ |
1603 | error_xfer_setup: | |
1604 | error_dequeued: | |
1605 | spin_unlock_irqrestore(&xfer->lock, flags); | |
1606 | /* FIXME: segmentation broken, kills DWA */ | |
1607 | if (wusb_dev) | |
1608 | wusb_dev_put(wusb_dev); | |
1609 | error_dev_gone: | |
1610 | rpipe_put(xfer->ep->hcpriv); | |
1611 | error_rpipe_get: | |
1612 | xfer->result = result; | |
33186c44 | 1613 | return result; |
df365423 IPG |
1614 | |
1615 | error_xfer_submit: | |
1616 | done = __wa_xfer_is_done(xfer); | |
1617 | xfer->result = result; | |
1618 | spin_unlock_irqrestore(&xfer->lock, flags); | |
1619 | if (done) | |
1620 | wa_xfer_completion(xfer); | |
33186c44 TP |
1621 | /* return success since the completion routine will run. */ |
1622 | return 0; | |
df365423 IPG |
1623 | } |
1624 | ||
1625 | /* | |
1626 | * Execute the delayed transfers in the Wire Adapter @wa | |
1627 | * | |
1628 | * We need to be careful here, as dequeue() could be called in the | |
1629 | * middle. That's why we do the whole thing under the | |
e9a088fa | 1630 | * wa->xfer_list_lock. If dequeue() jumps in, it first locks xfer->lock |
df365423 | 1631 | * and then checks the list -- so as we would be acquiring in inverse |
e9a088fa TP |
1632 | * order, we move the delayed list to a separate list while locked and then |
1633 | * submit them without the list lock held. | |
df365423 IPG |
1634 | */ |
1635 | void wa_urb_enqueue_run(struct work_struct *ws) | |
1636 | { | |
6d33f7bb | 1637 | struct wahc *wa = container_of(ws, struct wahc, xfer_enqueue_work); |
df365423 IPG |
1638 | struct wa_xfer *xfer, *next; |
1639 | struct urb *urb; | |
e9a088fa | 1640 | LIST_HEAD(tmp_list); |
df365423 | 1641 | |
e9a088fa | 1642 | /* Create a copy of the wa->xfer_delayed_list while holding the lock */ |
df365423 | 1643 | spin_lock_irq(&wa->xfer_list_lock); |
e9a088fa TP |
1644 | list_cut_position(&tmp_list, &wa->xfer_delayed_list, |
1645 | wa->xfer_delayed_list.prev); | |
1646 | spin_unlock_irq(&wa->xfer_list_lock); | |
1647 | ||
1648 | /* | |
1649 | * enqueue from temp list without list lock held since wa_urb_enqueue_b | |
1650 | * can take xfer->lock as well as lock mutexes. | |
1651 | */ | |
1652 | list_for_each_entry_safe(xfer, next, &tmp_list, list_node) { | |
df365423 | 1653 | list_del_init(&xfer->list_node); |
df365423 IPG |
1654 | |
1655 | urb = xfer->urb; | |
33186c44 TP |
1656 | if (wa_urb_enqueue_b(xfer) < 0) |
1657 | wa_xfer_giveback(xfer); | |
df365423 | 1658 | usb_put_urb(urb); /* taken when queuing */ |
df365423 | 1659 | } |
df365423 IPG |
1660 | } |
1661 | EXPORT_SYMBOL_GPL(wa_urb_enqueue_run); | |
1662 | ||
6d33f7bb TP |
1663 | /* |
1664 | * Process the errored transfers on the Wire Adapter outside of interrupt. | |
1665 | */ | |
1666 | void wa_process_errored_transfers_run(struct work_struct *ws) | |
1667 | { | |
1668 | struct wahc *wa = container_of(ws, struct wahc, xfer_error_work); | |
1669 | struct wa_xfer *xfer, *next; | |
1670 | LIST_HEAD(tmp_list); | |
1671 | ||
1672 | pr_info("%s: Run delayed STALL processing.\n", __func__); | |
1673 | ||
1674 | /* Create a copy of the wa->xfer_errored_list while holding the lock */ | |
1675 | spin_lock_irq(&wa->xfer_list_lock); | |
1676 | list_cut_position(&tmp_list, &wa->xfer_errored_list, | |
1677 | wa->xfer_errored_list.prev); | |
1678 | spin_unlock_irq(&wa->xfer_list_lock); | |
1679 | ||
1680 | /* | |
1681 | * run rpipe_clear_feature_stalled from temp list without list lock | |
1682 | * held. | |
1683 | */ | |
1684 | list_for_each_entry_safe(xfer, next, &tmp_list, list_node) { | |
1685 | struct usb_host_endpoint *ep; | |
1686 | unsigned long flags; | |
1687 | struct wa_rpipe *rpipe; | |
1688 | ||
1689 | spin_lock_irqsave(&xfer->lock, flags); | |
1690 | ep = xfer->ep; | |
1691 | rpipe = ep->hcpriv; | |
1692 | spin_unlock_irqrestore(&xfer->lock, flags); | |
1693 | ||
1694 | /* clear RPIPE feature stalled without holding a lock. */ | |
1695 | rpipe_clear_feature_stalled(wa, ep); | |
1696 | ||
1697 | /* complete the xfer. This removes it from the tmp list. */ | |
1698 | wa_xfer_completion(xfer); | |
1699 | ||
1700 | /* check for work. */ | |
1701 | wa_xfer_delayed_run(rpipe); | |
1702 | } | |
1703 | } | |
1704 | EXPORT_SYMBOL_GPL(wa_process_errored_transfers_run); | |
1705 | ||
df365423 IPG |
1706 | /* |
1707 | * Submit a transfer to the Wire Adapter in a delayed way | |
1708 | * | |
1709 | * The process of enqueuing involves possible sleeps() [see | |
1710 | * enqueue_b(), for the rpipe_get() and the mutex_lock()]. If we are | |
1711 | * in an atomic section, we defer the enqueue_b() call--else we call direct. | |
1712 | * | |
1713 | * @urb: We own a reference to it done by the HCI Linux USB stack that | |
1714 | * will be given up by calling usb_hcd_giveback_urb() or by | |
1715 | * returning error from this function -> ergo we don't have to | |
1716 | * refcount it. | |
1717 | */ | |
1718 | int wa_urb_enqueue(struct wahc *wa, struct usb_host_endpoint *ep, | |
1719 | struct urb *urb, gfp_t gfp) | |
1720 | { | |
1721 | int result; | |
1722 | struct device *dev = &wa->usb_iface->dev; | |
1723 | struct wa_xfer *xfer; | |
1724 | unsigned long my_flags; | |
1725 | unsigned cant_sleep = irqs_disabled() | in_atomic(); | |
1726 | ||
2b81c083 TP |
1727 | if ((urb->transfer_buffer == NULL) |
1728 | && (urb->sg == NULL) | |
df365423 IPG |
1729 | && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) |
1730 | && urb->transfer_buffer_length != 0) { | |
1731 | dev_err(dev, "BUG? urb %p: NULL xfer buffer & NODMA\n", urb); | |
1732 | dump_stack(); | |
1733 | } | |
1734 | ||
b374487e TP |
1735 | spin_lock_irqsave(&wa->xfer_list_lock, my_flags); |
1736 | result = usb_hcd_link_urb_to_ep(&(wa->wusb->usb_hcd), urb); | |
1737 | spin_unlock_irqrestore(&wa->xfer_list_lock, my_flags); | |
1738 | if (result < 0) | |
1739 | goto error_link_urb; | |
1740 | ||
df365423 IPG |
1741 | result = -ENOMEM; |
1742 | xfer = kzalloc(sizeof(*xfer), gfp); | |
1743 | if (xfer == NULL) | |
1744 | goto error_kmalloc; | |
1745 | ||
1746 | result = -ENOENT; | |
1747 | if (urb->status != -EINPROGRESS) /* cancelled */ | |
1748 | goto error_dequeued; /* before starting? */ | |
1749 | wa_xfer_init(xfer); | |
1750 | xfer->wa = wa_get(wa); | |
1751 | xfer->urb = urb; | |
1752 | xfer->gfp = gfp; | |
1753 | xfer->ep = ep; | |
1754 | urb->hcpriv = xfer; | |
bce83697 DV |
1755 | |
1756 | dev_dbg(dev, "xfer %p urb %p pipe 0x%02x [%d bytes] %s %s %s\n", | |
1757 | xfer, urb, urb->pipe, urb->transfer_buffer_length, | |
1758 | urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP ? "dma" : "nodma", | |
1759 | urb->pipe & USB_DIR_IN ? "inbound" : "outbound", | |
1760 | cant_sleep ? "deferred" : "inline"); | |
1761 | ||
df365423 IPG |
1762 | if (cant_sleep) { |
1763 | usb_get_urb(urb); | |
1764 | spin_lock_irqsave(&wa->xfer_list_lock, my_flags); | |
1765 | list_add_tail(&xfer->list_node, &wa->xfer_delayed_list); | |
1766 | spin_unlock_irqrestore(&wa->xfer_list_lock, my_flags); | |
6d33f7bb | 1767 | queue_work(wusbd, &wa->xfer_enqueue_work); |
df365423 | 1768 | } else { |
33186c44 TP |
1769 | result = wa_urb_enqueue_b(xfer); |
1770 | if (result < 0) { | |
1771 | /* | |
1772 | * URB submit/enqueue failed. Clean up, return an | |
1773 | * error and do not run the callback. This avoids | |
1774 | * an infinite submit/complete loop. | |
1775 | */ | |
1776 | dev_err(dev, "%s: URB enqueue failed: %d\n", | |
1777 | __func__, result); | |
1778 | wa_put(xfer->wa); | |
1779 | wa_xfer_put(xfer); | |
b374487e TP |
1780 | spin_lock_irqsave(&wa->xfer_list_lock, my_flags); |
1781 | usb_hcd_unlink_urb_from_ep(&(wa->wusb->usb_hcd), urb); | |
1782 | spin_unlock_irqrestore(&wa->xfer_list_lock, my_flags); | |
33186c44 TP |
1783 | return result; |
1784 | } | |
df365423 | 1785 | } |
df365423 IPG |
1786 | return 0; |
1787 | ||
1788 | error_dequeued: | |
1789 | kfree(xfer); | |
1790 | error_kmalloc: | |
b374487e TP |
1791 | spin_lock_irqsave(&wa->xfer_list_lock, my_flags); |
1792 | usb_hcd_unlink_urb_from_ep(&(wa->wusb->usb_hcd), urb); | |
1793 | spin_unlock_irqrestore(&wa->xfer_list_lock, my_flags); | |
1794 | error_link_urb: | |
df365423 IPG |
1795 | return result; |
1796 | } | |
1797 | EXPORT_SYMBOL_GPL(wa_urb_enqueue); | |
1798 | ||
1799 | /* | |
1800 | * Dequeue a URB and make sure uwb_hcd_giveback_urb() [completion | |
1801 | * handler] is called. | |
1802 | * | |
1803 | * Until a transfer goes successfully through wa_urb_enqueue() it | |
1804 | * needs to be dequeued with completion calling; when stuck in delayed | |
1805 | * or before wa_xfer_setup() is called, we need to do completion. | |
1806 | * | |
1807 | * not setup If there is no hcpriv yet, that means that that enqueue | |
1808 | * still had no time to set the xfer up. Because | |
1809 | * urb->status should be other than -EINPROGRESS, | |
1810 | * enqueue() will catch that and bail out. | |
1811 | * | |
1812 | * If the transfer has gone through setup, we just need to clean it | |
1813 | * up. If it has gone through submit(), we have to abort it [with an | |
1814 | * asynch request] and then make sure we cancel each segment. | |
1815 | * | |
1816 | */ | |
b374487e | 1817 | int wa_urb_dequeue(struct wahc *wa, struct urb *urb, int status) |
df365423 | 1818 | { |
df365423 IPG |
1819 | unsigned long flags, flags2; |
1820 | struct wa_xfer *xfer; | |
1821 | struct wa_seg *seg; | |
1822 | struct wa_rpipe *rpipe; | |
14e1d2df | 1823 | unsigned cnt, done = 0, xfer_abort_pending; |
df365423 | 1824 | unsigned rpipe_ready = 0; |
b374487e TP |
1825 | int result; |
1826 | ||
1827 | /* check if it is safe to unlink. */ | |
1828 | spin_lock_irqsave(&wa->xfer_list_lock, flags); | |
1829 | result = usb_hcd_check_unlink_urb(&(wa->wusb->usb_hcd), urb, status); | |
1830 | spin_unlock_irqrestore(&wa->xfer_list_lock, flags); | |
1831 | if (result) | |
1832 | return result; | |
df365423 | 1833 | |
df365423 IPG |
1834 | xfer = urb->hcpriv; |
1835 | if (xfer == NULL) { | |
6d33f7bb TP |
1836 | /* |
1837 | * Nothing setup yet enqueue will see urb->status != | |
df365423 IPG |
1838 | * -EINPROGRESS (by hcd layer) and bail out with |
1839 | * error, no need to do completion | |
1840 | */ | |
1841 | BUG_ON(urb->status == -EINPROGRESS); | |
1842 | goto out; | |
1843 | } | |
1844 | spin_lock_irqsave(&xfer->lock, flags); | |
14e1d2df | 1845 | pr_debug("%s: DEQUEUE xfer id 0x%08X\n", __func__, wa_xfer_id(xfer)); |
df365423 | 1846 | rpipe = xfer->ep->hcpriv; |
ec58fad1 | 1847 | if (rpipe == NULL) { |
bbfc3420 TP |
1848 | pr_debug("%s: xfer %p id 0x%08X has no RPIPE. %s", |
1849 | __func__, xfer, wa_xfer_id(xfer), | |
ec58fad1 TP |
1850 | "Probably already aborted.\n" ); |
1851 | goto out_unlock; | |
1852 | } | |
df365423 IPG |
1853 | /* Check the delayed list -> if there, release and complete */ |
1854 | spin_lock_irqsave(&wa->xfer_list_lock, flags2); | |
1855 | if (!list_empty(&xfer->list_node) && xfer->seg == NULL) | |
1856 | goto dequeue_delayed; | |
1857 | spin_unlock_irqrestore(&wa->xfer_list_lock, flags2); | |
1858 | if (xfer->seg == NULL) /* still hasn't reached */ | |
1859 | goto out_unlock; /* setup(), enqueue_b() completes */ | |
1860 | /* Ok, the xfer is in flight already, it's been setup and submitted.*/ | |
14e1d2df | 1861 | xfer_abort_pending = __wa_xfer_abort(xfer) >= 0; |
df365423 IPG |
1862 | for (cnt = 0; cnt < xfer->segs; cnt++) { |
1863 | seg = xfer->seg[cnt]; | |
14e1d2df TP |
1864 | pr_debug("%s: xfer id 0x%08X#%d status = %d\n", |
1865 | __func__, wa_xfer_id(xfer), cnt, seg->status); | |
df365423 IPG |
1866 | switch (seg->status) { |
1867 | case WA_SEG_NOTREADY: | |
1868 | case WA_SEG_READY: | |
1869 | printk(KERN_ERR "xfer %p#%u: dequeue bad state %u\n", | |
1870 | xfer, cnt, seg->status); | |
1871 | WARN_ON(1); | |
1872 | break; | |
1873 | case WA_SEG_DELAYED: | |
14e1d2df TP |
1874 | /* |
1875 | * delete from rpipe delayed list. If no segments on | |
1876 | * this xfer have been submitted, __wa_xfer_is_done will | |
1877 | * trigger a giveback below. Otherwise, the submitted | |
1878 | * segments will be completed in the DTI interrupt. | |
1879 | */ | |
df365423 IPG |
1880 | seg->status = WA_SEG_ABORTED; |
1881 | spin_lock_irqsave(&rpipe->seg_lock, flags2); | |
1882 | list_del(&seg->list_node); | |
1883 | xfer->segs_done++; | |
df365423 IPG |
1884 | spin_unlock_irqrestore(&rpipe->seg_lock, flags2); |
1885 | break; | |
df365423 IPG |
1886 | case WA_SEG_DONE: |
1887 | case WA_SEG_ERROR: | |
1888 | case WA_SEG_ABORTED: | |
1889 | break; | |
14e1d2df TP |
1890 | /* |
1891 | * In the states below, the HWA device already knows | |
1892 | * about the transfer. If an abort request was sent, | |
1893 | * allow the HWA to process it and wait for the | |
1894 | * results. Otherwise, the DTI state and seg completed | |
1895 | * counts can get out of sync. | |
1896 | */ | |
1897 | case WA_SEG_SUBMITTED: | |
1898 | case WA_SEG_PENDING: | |
1899 | case WA_SEG_DTI_PENDING: | |
1900 | /* | |
1901 | * Check if the abort was successfully sent. This could | |
1902 | * be false if the HWA has been removed but we haven't | |
1903 | * gotten the disconnect notification yet. | |
1904 | */ | |
1905 | if (!xfer_abort_pending) { | |
1906 | seg->status = WA_SEG_ABORTED; | |
1907 | rpipe_ready = rpipe_avail_inc(rpipe); | |
1908 | xfer->segs_done++; | |
1909 | } | |
1910 | break; | |
df365423 IPG |
1911 | } |
1912 | } | |
1913 | xfer->result = urb->status; /* -ENOENT or -ECONNRESET */ | |
14e1d2df | 1914 | done = __wa_xfer_is_done(xfer); |
df365423 | 1915 | spin_unlock_irqrestore(&xfer->lock, flags); |
14e1d2df TP |
1916 | if (done) |
1917 | wa_xfer_completion(xfer); | |
df365423 IPG |
1918 | if (rpipe_ready) |
1919 | wa_xfer_delayed_run(rpipe); | |
df365423 IPG |
1920 | return 0; |
1921 | ||
1922 | out_unlock: | |
1923 | spin_unlock_irqrestore(&xfer->lock, flags); | |
1924 | out: | |
df365423 IPG |
1925 | return 0; |
1926 | ||
1927 | dequeue_delayed: | |
1928 | list_del_init(&xfer->list_node); | |
1929 | spin_unlock_irqrestore(&wa->xfer_list_lock, flags2); | |
1930 | xfer->result = urb->status; | |
1931 | spin_unlock_irqrestore(&xfer->lock, flags); | |
1932 | wa_xfer_giveback(xfer); | |
1933 | usb_put_urb(urb); /* we got a ref in enqueue() */ | |
df365423 IPG |
1934 | return 0; |
1935 | } | |
1936 | EXPORT_SYMBOL_GPL(wa_urb_dequeue); | |
1937 | ||
1938 | /* | |
1939 | * Translation from WA status codes (WUSB1.0 Table 8.15) to errno | |
1940 | * codes | |
1941 | * | |
1942 | * Positive errno values are internal inconsistencies and should be | |
1943 | * flagged louder. Negative are to be passed up to the user in the | |
1944 | * normal way. | |
1945 | * | |
1946 | * @status: USB WA status code -- high two bits are stripped. | |
1947 | */ | |
1948 | static int wa_xfer_status_to_errno(u8 status) | |
1949 | { | |
1950 | int errno; | |
1951 | u8 real_status = status; | |
1952 | static int xlat[] = { | |
1953 | [WA_XFER_STATUS_SUCCESS] = 0, | |
1954 | [WA_XFER_STATUS_HALTED] = -EPIPE, | |
1955 | [WA_XFER_STATUS_DATA_BUFFER_ERROR] = -ENOBUFS, | |
1956 | [WA_XFER_STATUS_BABBLE] = -EOVERFLOW, | |
1957 | [WA_XFER_RESERVED] = EINVAL, | |
1958 | [WA_XFER_STATUS_NOT_FOUND] = 0, | |
1959 | [WA_XFER_STATUS_INSUFFICIENT_RESOURCE] = -ENOMEM, | |
1960 | [WA_XFER_STATUS_TRANSACTION_ERROR] = -EILSEQ, | |
1961 | [WA_XFER_STATUS_ABORTED] = -EINTR, | |
1962 | [WA_XFER_STATUS_RPIPE_NOT_READY] = EINVAL, | |
1963 | [WA_XFER_INVALID_FORMAT] = EINVAL, | |
1964 | [WA_XFER_UNEXPECTED_SEGMENT_NUMBER] = EINVAL, | |
1965 | [WA_XFER_STATUS_RPIPE_TYPE_MISMATCH] = EINVAL, | |
1966 | }; | |
1967 | status &= 0x3f; | |
1968 | ||
1969 | if (status == 0) | |
1970 | return 0; | |
1971 | if (status >= ARRAY_SIZE(xlat)) { | |
9708cd2f | 1972 | printk_ratelimited(KERN_ERR "%s(): BUG? " |
df365423 IPG |
1973 | "Unknown WA transfer status 0x%02x\n", |
1974 | __func__, real_status); | |
1975 | return -EINVAL; | |
1976 | } | |
1977 | errno = xlat[status]; | |
1978 | if (unlikely(errno > 0)) { | |
9708cd2f | 1979 | printk_ratelimited(KERN_ERR "%s(): BUG? " |
df365423 IPG |
1980 | "Inconsistent WA status: 0x%02x\n", |
1981 | __func__, real_status); | |
1982 | errno = -errno; | |
1983 | } | |
1984 | return errno; | |
1985 | } | |
1986 | ||
14e1d2df TP |
1987 | /* |
1988 | * If a last segment flag and/or a transfer result error is encountered, | |
1989 | * no other segment transfer results will be returned from the device. | |
1990 | * Mark the remaining submitted or pending xfers as completed so that | |
1991 | * the xfer will complete cleanly. | |
1992 | */ | |
1993 | static void wa_complete_remaining_xfer_segs(struct wa_xfer *xfer, | |
1994 | struct wa_seg *incoming_seg) | |
1995 | { | |
1996 | int index; | |
1997 | struct wa_rpipe *rpipe = xfer->ep->hcpriv; | |
1998 | ||
1999 | for (index = incoming_seg->index + 1; index < xfer->segs_submitted; | |
2000 | index++) { | |
2001 | struct wa_seg *current_seg = xfer->seg[index]; | |
2002 | ||
2003 | BUG_ON(current_seg == NULL); | |
2004 | ||
2005 | switch (current_seg->status) { | |
2006 | case WA_SEG_SUBMITTED: | |
2007 | case WA_SEG_PENDING: | |
2008 | case WA_SEG_DTI_PENDING: | |
2009 | rpipe_avail_inc(rpipe); | |
2010 | /* | |
2011 | * do not increment RPIPE avail for the WA_SEG_DELAYED case | |
2012 | * since it has not been submitted to the RPIPE. | |
2013 | */ | |
2014 | case WA_SEG_DELAYED: | |
2015 | xfer->segs_done++; | |
2016 | current_seg->status = incoming_seg->status; | |
2017 | break; | |
2018 | case WA_SEG_ABORTED: | |
2019 | break; | |
2020 | default: | |
2021 | WARN(1, "%s: xfer 0x%08X#%d. bad seg status = %d\n", | |
2022 | __func__, wa_xfer_id(xfer), index, | |
2023 | current_seg->status); | |
2024 | break; | |
2025 | } | |
2026 | } | |
2027 | } | |
2028 | ||
df365423 IPG |
2029 | /* |
2030 | * Process a xfer result completion message | |
2031 | * | |
14e1d2df | 2032 | * inbound transfers: need to schedule a buf_in_urb read |
df365423 | 2033 | * |
6d33f7bb | 2034 | * FIXME: this function needs to be broken up in parts |
df365423 | 2035 | */ |
0367eef2 TP |
2036 | static void wa_xfer_result_chew(struct wahc *wa, struct wa_xfer *xfer, |
2037 | struct wa_xfer_result *xfer_result) | |
df365423 IPG |
2038 | { |
2039 | int result; | |
2040 | struct device *dev = &wa->usb_iface->dev; | |
2041 | unsigned long flags; | |
2042 | u8 seg_idx; | |
2043 | struct wa_seg *seg; | |
2044 | struct wa_rpipe *rpipe; | |
0367eef2 | 2045 | unsigned done = 0; |
df365423 IPG |
2046 | u8 usb_status; |
2047 | unsigned rpipe_ready = 0; | |
2048 | ||
df365423 IPG |
2049 | spin_lock_irqsave(&xfer->lock, flags); |
2050 | seg_idx = xfer_result->bTransferSegment & 0x7f; | |
2051 | if (unlikely(seg_idx >= xfer->segs)) | |
2052 | goto error_bad_seg; | |
2053 | seg = xfer->seg[seg_idx]; | |
2054 | rpipe = xfer->ep->hcpriv; | |
2055 | usb_status = xfer_result->bTransferStatus; | |
b9c84be6 TP |
2056 | dev_dbg(dev, "xfer %p ID 0x%08X#%u: bTransferStatus 0x%02x (seg status %u)\n", |
2057 | xfer, wa_xfer_id(xfer), seg_idx, usb_status, seg->status); | |
df365423 IPG |
2058 | if (seg->status == WA_SEG_ABORTED |
2059 | || seg->status == WA_SEG_ERROR) /* already handled */ | |
2060 | goto segment_aborted; | |
2061 | if (seg->status == WA_SEG_SUBMITTED) /* ops, got here */ | |
2062 | seg->status = WA_SEG_PENDING; /* before wa_seg{_dto}_cb() */ | |
2063 | if (seg->status != WA_SEG_PENDING) { | |
2064 | if (printk_ratelimit()) | |
2065 | dev_err(dev, "xfer %p#%u: Bad segment state %u\n", | |
2066 | xfer, seg_idx, seg->status); | |
2067 | seg->status = WA_SEG_PENDING; /* workaround/"fix" it */ | |
2068 | } | |
2069 | if (usb_status & 0x80) { | |
2070 | seg->result = wa_xfer_status_to_errno(usb_status); | |
2b81c083 TP |
2071 | dev_err(dev, "DTI: xfer %p#:%08X:%u failed (0x%02x)\n", |
2072 | xfer, xfer->id, seg->index, usb_status); | |
14e1d2df TP |
2073 | seg->status = ((usb_status & 0x7F) == WA_XFER_STATUS_ABORTED) ? |
2074 | WA_SEG_ABORTED : WA_SEG_ERROR; | |
df365423 IPG |
2075 | goto error_complete; |
2076 | } | |
2077 | /* FIXME: we ignore warnings, tally them for stats */ | |
2078 | if (usb_status & 0x40) /* Warning?... */ | |
2079 | usb_status = 0; /* ... pass */ | |
7a32d9be TP |
2080 | if (usb_pipeisoc(xfer->urb->pipe)) { |
2081 | /* set up WA state to read the isoc packet status next. */ | |
2082 | wa->dti_isoc_xfer_in_progress = wa_xfer_id(xfer); | |
2083 | wa->dti_isoc_xfer_seg = seg_idx; | |
2084 | wa->dti_state = WA_DTI_ISOC_PACKET_STATUS_PENDING; | |
2085 | } else if (xfer->is_inbound) { /* IN data phase: read to buffer */ | |
df365423 IPG |
2086 | seg->status = WA_SEG_DTI_PENDING; |
2087 | BUG_ON(wa->buf_in_urb->status == -EINPROGRESS); | |
2b81c083 TP |
2088 | /* this should always be 0 before a resubmit. */ |
2089 | wa->buf_in_urb->num_mapped_sgs = 0; | |
2090 | ||
df365423 IPG |
2091 | if (xfer->is_dma) { |
2092 | wa->buf_in_urb->transfer_dma = | |
2093 | xfer->urb->transfer_dma | |
2b81c083 | 2094 | + (seg_idx * xfer->seg_size); |
df365423 IPG |
2095 | wa->buf_in_urb->transfer_flags |
2096 | |= URB_NO_TRANSFER_DMA_MAP; | |
2b81c083 TP |
2097 | wa->buf_in_urb->transfer_buffer = NULL; |
2098 | wa->buf_in_urb->sg = NULL; | |
2099 | wa->buf_in_urb->num_sgs = 0; | |
df365423 | 2100 | } else { |
2b81c083 | 2101 | /* do buffer or SG processing. */ |
df365423 IPG |
2102 | wa->buf_in_urb->transfer_flags |
2103 | &= ~URB_NO_TRANSFER_DMA_MAP; | |
2b81c083 TP |
2104 | |
2105 | if (xfer->urb->transfer_buffer) { | |
2106 | wa->buf_in_urb->transfer_buffer = | |
2107 | xfer->urb->transfer_buffer | |
2108 | + (seg_idx * xfer->seg_size); | |
2109 | wa->buf_in_urb->sg = NULL; | |
2110 | wa->buf_in_urb->num_sgs = 0; | |
2111 | } else { | |
2112 | /* allocate an SG list to store seg_size bytes | |
2113 | and copy the subset of the xfer->urb->sg | |
2114 | that matches the buffer subset we are | |
2115 | about to read. */ | |
2116 | wa->buf_in_urb->sg = wa_xfer_create_subset_sg( | |
2117 | xfer->urb->sg, | |
2118 | seg_idx * xfer->seg_size, | |
2119 | le32_to_cpu( | |
2120 | xfer_result->dwTransferLength), | |
2121 | &(wa->buf_in_urb->num_sgs)); | |
2122 | ||
2123 | if (!(wa->buf_in_urb->sg)) { | |
2124 | wa->buf_in_urb->num_sgs = 0; | |
2125 | goto error_sg_alloc; | |
2126 | } | |
2127 | wa->buf_in_urb->transfer_buffer = NULL; | |
2128 | } | |
df365423 IPG |
2129 | } |
2130 | wa->buf_in_urb->transfer_buffer_length = | |
2131 | le32_to_cpu(xfer_result->dwTransferLength); | |
2132 | wa->buf_in_urb->context = seg; | |
2133 | result = usb_submit_urb(wa->buf_in_urb, GFP_ATOMIC); | |
2134 | if (result < 0) | |
2135 | goto error_submit_buf_in; | |
2136 | } else { | |
2137 | /* OUT data phase, complete it -- */ | |
2138 | seg->status = WA_SEG_DONE; | |
2139 | seg->result = le32_to_cpu(xfer_result->dwTransferLength); | |
2140 | xfer->segs_done++; | |
2141 | rpipe_ready = rpipe_avail_inc(rpipe); | |
2142 | done = __wa_xfer_is_done(xfer); | |
2143 | } | |
2144 | spin_unlock_irqrestore(&xfer->lock, flags); | |
2145 | if (done) | |
2146 | wa_xfer_completion(xfer); | |
2147 | if (rpipe_ready) | |
2148 | wa_xfer_delayed_run(rpipe); | |
df365423 IPG |
2149 | return; |
2150 | ||
df365423 IPG |
2151 | error_submit_buf_in: |
2152 | if (edc_inc(&wa->dti_edc, EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME)) { | |
2153 | dev_err(dev, "DTI: URB max acceptable errors " | |
2154 | "exceeded, resetting device\n"); | |
2155 | wa_reset_all(wa); | |
2156 | } | |
2157 | if (printk_ratelimit()) | |
2158 | dev_err(dev, "xfer %p#%u: can't submit DTI data phase: %d\n", | |
2159 | xfer, seg_idx, result); | |
2160 | seg->result = result; | |
2b81c083 | 2161 | kfree(wa->buf_in_urb->sg); |
6741448e | 2162 | wa->buf_in_urb->sg = NULL; |
2b81c083 | 2163 | error_sg_alloc: |
6d33f7bb | 2164 | __wa_xfer_abort(xfer); |
df365423 | 2165 | seg->status = WA_SEG_ERROR; |
14e1d2df | 2166 | error_complete: |
df365423 IPG |
2167 | xfer->segs_done++; |
2168 | rpipe_ready = rpipe_avail_inc(rpipe); | |
14e1d2df | 2169 | wa_complete_remaining_xfer_segs(xfer, seg); |
df365423 | 2170 | done = __wa_xfer_is_done(xfer); |
6d33f7bb TP |
2171 | /* |
2172 | * queue work item to clear STALL for control endpoints. | |
2173 | * Otherwise, let endpoint_reset take care of it. | |
2174 | */ | |
2175 | if (((usb_status & 0x3f) == WA_XFER_STATUS_HALTED) && | |
2176 | usb_endpoint_xfer_control(&xfer->ep->desc) && | |
2177 | done) { | |
2178 | ||
2179 | dev_info(dev, "Control EP stall. Queue delayed work.\n"); | |
2180 | spin_lock_irq(&wa->xfer_list_lock); | |
8eb41299 WY |
2181 | /* move xfer from xfer_list to xfer_errored_list. */ |
2182 | list_move_tail(&xfer->list_node, &wa->xfer_errored_list); | |
6d33f7bb TP |
2183 | spin_unlock_irq(&wa->xfer_list_lock); |
2184 | spin_unlock_irqrestore(&xfer->lock, flags); | |
2185 | queue_work(wusbd, &wa->xfer_error_work); | |
2186 | } else { | |
2187 | spin_unlock_irqrestore(&xfer->lock, flags); | |
2188 | if (done) | |
2189 | wa_xfer_completion(xfer); | |
2190 | if (rpipe_ready) | |
2191 | wa_xfer_delayed_run(rpipe); | |
2192 | } | |
2193 | ||
df365423 IPG |
2194 | return; |
2195 | ||
df365423 IPG |
2196 | error_bad_seg: |
2197 | spin_unlock_irqrestore(&xfer->lock, flags); | |
b374487e | 2198 | wa_urb_dequeue(wa, xfer->urb, -ENOENT); |
df365423 IPG |
2199 | if (printk_ratelimit()) |
2200 | dev_err(dev, "xfer %p#%u: bad segment\n", xfer, seg_idx); | |
2201 | if (edc_inc(&wa->dti_edc, EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME)) { | |
2202 | dev_err(dev, "DTI: URB max acceptable errors " | |
2203 | "exceeded, resetting device\n"); | |
2204 | wa_reset_all(wa); | |
2205 | } | |
df365423 IPG |
2206 | return; |
2207 | ||
df365423 IPG |
2208 | segment_aborted: |
2209 | /* nothing to do, as the aborter did the completion */ | |
2210 | spin_unlock_irqrestore(&xfer->lock, flags); | |
df365423 IPG |
2211 | } |
2212 | ||
7a32d9be TP |
2213 | /* |
2214 | * Process a isochronous packet status message | |
2215 | * | |
2216 | * inbound transfers: need to schedule a buf_in_urb read | |
2217 | */ | |
2218 | static void wa_process_iso_packet_status(struct wahc *wa, struct urb *urb) | |
2219 | { | |
2220 | struct device *dev = &wa->usb_iface->dev; | |
2221 | struct wa_xfer_packet_status_hwaiso *packet_status; | |
2101242c | 2222 | struct wa_xfer_packet_status_len_hwaiso *status_array; |
7a32d9be TP |
2223 | struct wa_xfer *xfer; |
2224 | unsigned long flags; | |
2225 | struct wa_seg *seg; | |
2226 | struct wa_rpipe *rpipe; | |
2227 | unsigned done = 0; | |
2101242c TP |
2228 | unsigned rpipe_ready = 0, seg_index; |
2229 | int expected_size; | |
7a32d9be TP |
2230 | |
2231 | /* We have a xfer result buffer; check it */ | |
2232 | dev_dbg(dev, "DTI: isoc packet status %d bytes at %p\n", | |
2233 | urb->actual_length, urb->transfer_buffer); | |
7a32d9be | 2234 | packet_status = (struct wa_xfer_packet_status_hwaiso *)(wa->dti_buf); |
7a32d9be TP |
2235 | if (packet_status->bPacketType != WA_XFER_ISO_PACKET_STATUS) { |
2236 | dev_err(dev, "DTI Error: isoc packet status--bad type 0x%02x\n", | |
2237 | packet_status->bPacketType); | |
2238 | goto error_parse_buffer; | |
2239 | } | |
2240 | xfer = wa_xfer_get_by_id(wa, wa->dti_isoc_xfer_in_progress); | |
2241 | if (xfer == NULL) { | |
2242 | dev_err(dev, "DTI Error: isoc packet status--unknown xfer 0x%08x\n", | |
2243 | wa->dti_isoc_xfer_in_progress); | |
2244 | goto error_parse_buffer; | |
2245 | } | |
2246 | spin_lock_irqsave(&xfer->lock, flags); | |
2247 | if (unlikely(wa->dti_isoc_xfer_seg >= xfer->segs)) | |
2248 | goto error_bad_seg; | |
2249 | seg = xfer->seg[wa->dti_isoc_xfer_seg]; | |
2250 | rpipe = xfer->ep->hcpriv; | |
2101242c TP |
2251 | expected_size = sizeof(*packet_status) + |
2252 | (sizeof(packet_status->PacketStatus[0]) * | |
2253 | seg->isoc_frame_count); | |
2254 | if (urb->actual_length != expected_size) { | |
2255 | dev_err(dev, "DTI Error: isoc packet status--bad urb length (%d bytes vs %d needed)\n", | |
2256 | urb->actual_length, expected_size); | |
2257 | goto error_bad_seg; | |
2258 | } | |
2259 | if (le16_to_cpu(packet_status->wLength) != expected_size) { | |
2260 | dev_err(dev, "DTI Error: isoc packet status--bad length %u\n", | |
2261 | le16_to_cpu(packet_status->wLength)); | |
2262 | goto error_bad_seg; | |
2263 | } | |
2264 | /* isoc packet status and lengths back xfer urb. */ | |
2265 | status_array = packet_status->PacketStatus; | |
2266 | for (seg_index = 0; seg_index < seg->isoc_frame_count; ++seg_index) { | |
2267 | xfer->urb->iso_frame_desc[seg->index].status = | |
2268 | wa_xfer_status_to_errno( | |
2269 | le16_to_cpu(status_array[seg_index].PacketStatus)); | |
2270 | xfer->urb->iso_frame_desc[seg->index].actual_length = | |
2271 | le16_to_cpu(status_array[seg_index].PacketLength); | |
2272 | } | |
7a32d9be TP |
2273 | |
2274 | if (!xfer->is_inbound) { | |
2275 | /* OUT transfer, complete it -- */ | |
2276 | seg->status = WA_SEG_DONE; | |
2277 | xfer->segs_done++; | |
2278 | rpipe_ready = rpipe_avail_inc(rpipe); | |
2279 | done = __wa_xfer_is_done(xfer); | |
2280 | } | |
2281 | spin_unlock_irqrestore(&xfer->lock, flags); | |
2282 | wa->dti_state = WA_DTI_TRANSFER_RESULT_PENDING; | |
2283 | if (done) | |
2284 | wa_xfer_completion(xfer); | |
2285 | if (rpipe_ready) | |
2286 | wa_xfer_delayed_run(rpipe); | |
2287 | wa_xfer_put(xfer); | |
2288 | return; | |
2289 | ||
2290 | error_bad_seg: | |
2291 | spin_unlock_irqrestore(&xfer->lock, flags); | |
2292 | wa_xfer_put(xfer); | |
2293 | error_parse_buffer: | |
2294 | return; | |
2295 | } | |
2296 | ||
df365423 IPG |
2297 | /* |
2298 | * Callback for the IN data phase | |
2299 | * | |
af901ca1 | 2300 | * If successful transition state; otherwise, take a note of the |
df365423 IPG |
2301 | * error, mark this segment done and try completion. |
2302 | * | |
2303 | * Note we don't access until we are sure that the transfer hasn't | |
2304 | * been cancelled (ECONNRESET, ENOENT), which could mean that | |
2305 | * seg->xfer could be already gone. | |
2306 | */ | |
2307 | static void wa_buf_in_cb(struct urb *urb) | |
2308 | { | |
2309 | struct wa_seg *seg = urb->context; | |
2310 | struct wa_xfer *xfer = seg->xfer; | |
2311 | struct wahc *wa; | |
2312 | struct device *dev; | |
2313 | struct wa_rpipe *rpipe; | |
2314 | unsigned rpipe_ready; | |
2315 | unsigned long flags; | |
2316 | u8 done = 0; | |
2317 | ||
2b81c083 TP |
2318 | /* free the sg if it was used. */ |
2319 | kfree(urb->sg); | |
2320 | urb->sg = NULL; | |
2321 | ||
df365423 IPG |
2322 | switch (urb->status) { |
2323 | case 0: | |
2324 | spin_lock_irqsave(&xfer->lock, flags); | |
2325 | wa = xfer->wa; | |
2326 | dev = &wa->usb_iface->dev; | |
2327 | rpipe = xfer->ep->hcpriv; | |
bce83697 DV |
2328 | dev_dbg(dev, "xfer %p#%u: data in done (%zu bytes)\n", |
2329 | xfer, seg->index, (size_t)urb->actual_length); | |
df365423 IPG |
2330 | seg->status = WA_SEG_DONE; |
2331 | seg->result = urb->actual_length; | |
2332 | xfer->segs_done++; | |
2333 | rpipe_ready = rpipe_avail_inc(rpipe); | |
2334 | done = __wa_xfer_is_done(xfer); | |
2335 | spin_unlock_irqrestore(&xfer->lock, flags); | |
2336 | if (done) | |
2337 | wa_xfer_completion(xfer); | |
2338 | if (rpipe_ready) | |
2339 | wa_xfer_delayed_run(rpipe); | |
2340 | break; | |
2341 | case -ECONNRESET: /* URB unlinked; no need to do anything */ | |
2342 | case -ENOENT: /* as it was done by the who unlinked us */ | |
2343 | break; | |
2344 | default: /* Other errors ... */ | |
2345 | spin_lock_irqsave(&xfer->lock, flags); | |
2346 | wa = xfer->wa; | |
2347 | dev = &wa->usb_iface->dev; | |
2348 | rpipe = xfer->ep->hcpriv; | |
2349 | if (printk_ratelimit()) | |
2350 | dev_err(dev, "xfer %p#%u: data in error %d\n", | |
2351 | xfer, seg->index, urb->status); | |
2352 | if (edc_inc(&wa->nep_edc, EDC_MAX_ERRORS, | |
2353 | EDC_ERROR_TIMEFRAME)){ | |
2354 | dev_err(dev, "DTO: URB max acceptable errors " | |
2355 | "exceeded, resetting device\n"); | |
2356 | wa_reset_all(wa); | |
2357 | } | |
2358 | seg->status = WA_SEG_ERROR; | |
2359 | seg->result = urb->status; | |
2360 | xfer->segs_done++; | |
2361 | rpipe_ready = rpipe_avail_inc(rpipe); | |
2362 | __wa_xfer_abort(xfer); | |
2363 | done = __wa_xfer_is_done(xfer); | |
2364 | spin_unlock_irqrestore(&xfer->lock, flags); | |
2365 | if (done) | |
2366 | wa_xfer_completion(xfer); | |
2367 | if (rpipe_ready) | |
2368 | wa_xfer_delayed_run(rpipe); | |
2369 | } | |
df365423 IPG |
2370 | } |
2371 | ||
2372 | /* | |
2373 | * Handle an incoming transfer result buffer | |
2374 | * | |
2375 | * Given a transfer result buffer, it completes the transfer (possibly | |
2376 | * scheduling and buffer in read) and then resubmits the DTI URB for a | |
2377 | * new transfer result read. | |
2378 | * | |
2379 | * | |
2380 | * The xfer_result DTI URB state machine | |
2381 | * | |
2382 | * States: OFF | RXR (Read-Xfer-Result) | RBI (Read-Buffer-In) | |
2383 | * | |
2384 | * We start in OFF mode, the first xfer_result notification [through | |
2385 | * wa_handle_notif_xfer()] moves us to RXR by posting the DTI-URB to | |
2386 | * read. | |
2387 | * | |
2388 | * We receive a buffer -- if it is not a xfer_result, we complain and | |
2389 | * repost the DTI-URB. If it is a xfer_result then do the xfer seg | |
2390 | * request accounting. If it is an IN segment, we move to RBI and post | |
2391 | * a BUF-IN-URB to the right buffer. The BUF-IN-URB callback will | |
2392 | * repost the DTI-URB and move to RXR state. if there was no IN | |
2393 | * segment, it will repost the DTI-URB. | |
2394 | * | |
2395 | * We go back to OFF when we detect a ENOENT or ESHUTDOWN (or too many | |
2396 | * errors) in the URBs. | |
2397 | */ | |
0367eef2 | 2398 | static void wa_dti_cb(struct urb *urb) |
df365423 IPG |
2399 | { |
2400 | int result; | |
2401 | struct wahc *wa = urb->context; | |
2402 | struct device *dev = &wa->usb_iface->dev; | |
df365423 | 2403 | u32 xfer_id; |
df365423 IPG |
2404 | u8 usb_status; |
2405 | ||
df365423 IPG |
2406 | BUG_ON(wa->dti_urb != urb); |
2407 | switch (wa->dti_urb->status) { | |
2408 | case 0: | |
7a32d9be TP |
2409 | if (wa->dti_state == WA_DTI_TRANSFER_RESULT_PENDING) { |
2410 | struct wa_xfer_result *xfer_result; | |
2411 | struct wa_xfer *xfer; | |
2412 | ||
2413 | /* We have a xfer result buffer; check it */ | |
2414 | dev_dbg(dev, "DTI: xfer result %d bytes at %p\n", | |
2415 | urb->actual_length, urb->transfer_buffer); | |
2416 | if (urb->actual_length != sizeof(*xfer_result)) { | |
2417 | dev_err(dev, "DTI Error: xfer result--bad size xfer result (%d bytes vs %zu needed)\n", | |
2418 | urb->actual_length, | |
2419 | sizeof(*xfer_result)); | |
2420 | break; | |
2421 | } | |
2422 | xfer_result = (struct wa_xfer_result *)(wa->dti_buf); | |
2423 | if (xfer_result->hdr.bLength != sizeof(*xfer_result)) { | |
2424 | dev_err(dev, "DTI Error: xfer result--bad header length %u\n", | |
2425 | xfer_result->hdr.bLength); | |
2426 | break; | |
2427 | } | |
2428 | if (xfer_result->hdr.bNotifyType != WA_XFER_RESULT) { | |
2429 | dev_err(dev, "DTI Error: xfer result--bad header type 0x%02x\n", | |
2430 | xfer_result->hdr.bNotifyType); | |
2431 | break; | |
2432 | } | |
2433 | usb_status = xfer_result->bTransferStatus & 0x3f; | |
2434 | if (usb_status == WA_XFER_STATUS_NOT_FOUND) | |
2435 | /* taken care of already */ | |
2436 | break; | |
2437 | xfer_id = le32_to_cpu(xfer_result->dwTransferID); | |
2438 | xfer = wa_xfer_get_by_id(wa, xfer_id); | |
2439 | if (xfer == NULL) { | |
2440 | /* FIXME: transaction not found. */ | |
2441 | dev_err(dev, "DTI Error: xfer result--unknown xfer 0x%08x (status 0x%02x)\n", | |
2442 | xfer_id, usb_status); | |
2443 | break; | |
2444 | } | |
2445 | wa_xfer_result_chew(wa, xfer, xfer_result); | |
2446 | wa_xfer_put(xfer); | |
2447 | } else if (wa->dti_state == WA_DTI_ISOC_PACKET_STATUS_PENDING) { | |
2448 | wa_process_iso_packet_status(wa, urb); | |
2449 | } else { | |
2450 | dev_err(dev, "DTI Error: unexpected EP state = %d\n", | |
2451 | wa->dti_state); | |
df365423 | 2452 | } |
df365423 IPG |
2453 | break; |
2454 | case -ENOENT: /* (we killed the URB)...so, no broadcast */ | |
2455 | case -ESHUTDOWN: /* going away! */ | |
2456 | dev_dbg(dev, "DTI: going down! %d\n", urb->status); | |
2457 | goto out; | |
2458 | default: | |
2459 | /* Unknown error */ | |
2460 | if (edc_inc(&wa->dti_edc, EDC_MAX_ERRORS, | |
2461 | EDC_ERROR_TIMEFRAME)) { | |
2462 | dev_err(dev, "DTI: URB max acceptable errors " | |
2463 | "exceeded, resetting device\n"); | |
2464 | wa_reset_all(wa); | |
2465 | goto out; | |
2466 | } | |
2467 | if (printk_ratelimit()) | |
2468 | dev_err(dev, "DTI: URB error %d\n", urb->status); | |
2469 | break; | |
2470 | } | |
2471 | /* Resubmit the DTI URB */ | |
2472 | result = usb_submit_urb(wa->dti_urb, GFP_ATOMIC); | |
2473 | if (result < 0) { | |
2474 | dev_err(dev, "DTI Error: Could not submit DTI URB (%d), " | |
2475 | "resetting\n", result); | |
2476 | wa_reset_all(wa); | |
2477 | } | |
2478 | out: | |
df365423 IPG |
2479 | return; |
2480 | } | |
2481 | ||
2482 | /* | |
2483 | * Transfer complete notification | |
2484 | * | |
2485 | * Called from the notif.c code. We get a notification on EP2 saying | |
2486 | * that some endpoint has some transfer result data available. We are | |
2487 | * about to read it. | |
2488 | * | |
2489 | * To speed up things, we always have a URB reading the DTI URB; we | |
2490 | * don't really set it up and start it until the first xfer complete | |
2491 | * notification arrives, which is what we do here. | |
2492 | * | |
0367eef2 | 2493 | * Follow up in wa_dti_cb(), as that's where the whole state |
df365423 IPG |
2494 | * machine starts. |
2495 | * | |
2496 | * So here we just initialize the DTI URB for reading transfer result | |
2497 | * notifications and also the buffer-in URB, for reading buffers. Then | |
2498 | * we just submit the DTI URB. | |
2499 | * | |
2500 | * @wa shall be referenced | |
2501 | */ | |
2502 | void wa_handle_notif_xfer(struct wahc *wa, struct wa_notif_hdr *notif_hdr) | |
2503 | { | |
2504 | int result; | |
2505 | struct device *dev = &wa->usb_iface->dev; | |
2506 | struct wa_notif_xfer *notif_xfer; | |
2507 | const struct usb_endpoint_descriptor *dti_epd = wa->dti_epd; | |
2508 | ||
df365423 IPG |
2509 | notif_xfer = container_of(notif_hdr, struct wa_notif_xfer, hdr); |
2510 | BUG_ON(notif_hdr->bNotifyType != WA_NOTIF_TRANSFER); | |
2511 | ||
2512 | if ((0x80 | notif_xfer->bEndpoint) != dti_epd->bEndpointAddress) { | |
2513 | /* FIXME: hardcoded limitation, adapt */ | |
2514 | dev_err(dev, "BUG: DTI ep is %u, not %u (hack me)\n", | |
2515 | notif_xfer->bEndpoint, dti_epd->bEndpointAddress); | |
2516 | goto error; | |
2517 | } | |
2518 | if (wa->dti_urb != NULL) /* DTI URB already started */ | |
2519 | goto out; | |
2520 | ||
2521 | wa->dti_urb = usb_alloc_urb(0, GFP_KERNEL); | |
2522 | if (wa->dti_urb == NULL) { | |
2523 | dev_err(dev, "Can't allocate DTI URB\n"); | |
2524 | goto error_dti_urb_alloc; | |
2525 | } | |
2526 | usb_fill_bulk_urb( | |
2527 | wa->dti_urb, wa->usb_dev, | |
2528 | usb_rcvbulkpipe(wa->usb_dev, 0x80 | notif_xfer->bEndpoint), | |
0367eef2 TP |
2529 | wa->dti_buf, wa->dti_buf_size, |
2530 | wa_dti_cb, wa); | |
df365423 IPG |
2531 | |
2532 | wa->buf_in_urb = usb_alloc_urb(0, GFP_KERNEL); | |
2533 | if (wa->buf_in_urb == NULL) { | |
2534 | dev_err(dev, "Can't allocate BUF-IN URB\n"); | |
2535 | goto error_buf_in_urb_alloc; | |
2536 | } | |
2537 | usb_fill_bulk_urb( | |
2538 | wa->buf_in_urb, wa->usb_dev, | |
2539 | usb_rcvbulkpipe(wa->usb_dev, 0x80 | notif_xfer->bEndpoint), | |
2540 | NULL, 0, wa_buf_in_cb, wa); | |
2541 | result = usb_submit_urb(wa->dti_urb, GFP_KERNEL); | |
2542 | if (result < 0) { | |
2543 | dev_err(dev, "DTI Error: Could not submit DTI URB (%d), " | |
2544 | "resetting\n", result); | |
2545 | goto error_dti_urb_submit; | |
2546 | } | |
2547 | out: | |
df365423 IPG |
2548 | return; |
2549 | ||
2550 | error_dti_urb_submit: | |
2551 | usb_put_urb(wa->buf_in_urb); | |
6741448e | 2552 | wa->buf_in_urb = NULL; |
df365423 IPG |
2553 | error_buf_in_urb_alloc: |
2554 | usb_put_urb(wa->dti_urb); | |
2555 | wa->dti_urb = NULL; | |
2556 | error_dti_urb_alloc: | |
2557 | error: | |
2558 | wa_reset_all(wa); | |
df365423 | 2559 | } |