Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2001-2004 by David Brownell | |
3 | * Copyright (c) 2003 Michal Sojka, for high-speed iso transfers | |
53bd6a60 | 4 | * |
1da177e4 LT |
5 | * This program is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License as published by the | |
7 | * Free Software Foundation; either version 2 of the License, or (at your | |
8 | * option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
12 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
13 | * for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software Foundation, | |
17 | * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | */ | |
19 | ||
20 | /* this file is part of ehci-hcd.c */ | |
21 | ||
22 | /*-------------------------------------------------------------------------*/ | |
23 | ||
24 | /* | |
25 | * EHCI scheduled transaction support: interrupt, iso, split iso | |
26 | * These are called "periodic" transactions in the EHCI spec. | |
27 | * | |
28 | * Note that for interrupt transfers, the QH/QTD manipulation is shared | |
29 | * with the "asynchronous" transaction support (control/bulk transfers). | |
30 | * The only real difference is in how interrupt transfers are scheduled. | |
31 | * | |
32 | * For ISO, we make an "iso_stream" head to serve the same role as a QH. | |
33 | * It keeps track of every ITD (or SITD) that's linked, and holds enough | |
34 | * pre-calculated schedule data to make appending to the queue be quick. | |
35 | */ | |
36 | ||
37 | static int ehci_get_frame (struct usb_hcd *hcd); | |
38 | ||
39 | /*-------------------------------------------------------------------------*/ | |
40 | ||
41 | /* | |
42 | * periodic_next_shadow - return "next" pointer on shadow list | |
43 | * @periodic: host pointer to qh/itd/sitd | |
44 | * @tag: hardware tag for type of this record | |
45 | */ | |
46 | static union ehci_shadow * | |
6dbd682b SR |
47 | periodic_next_shadow(struct ehci_hcd *ehci, union ehci_shadow *periodic, |
48 | __hc32 tag) | |
1da177e4 | 49 | { |
6dbd682b | 50 | switch (hc32_to_cpu(ehci, tag)) { |
1da177e4 LT |
51 | case Q_TYPE_QH: |
52 | return &periodic->qh->qh_next; | |
53 | case Q_TYPE_FSTN: | |
54 | return &periodic->fstn->fstn_next; | |
55 | case Q_TYPE_ITD: | |
56 | return &periodic->itd->itd_next; | |
57 | // case Q_TYPE_SITD: | |
58 | default: | |
59 | return &periodic->sitd->sitd_next; | |
60 | } | |
61 | } | |
62 | ||
63 | /* caller must hold ehci->lock */ | |
64 | static void periodic_unlink (struct ehci_hcd *ehci, unsigned frame, void *ptr) | |
65 | { | |
6dbd682b SR |
66 | union ehci_shadow *prev_p = &ehci->pshadow[frame]; |
67 | __hc32 *hw_p = &ehci->periodic[frame]; | |
1da177e4 LT |
68 | union ehci_shadow here = *prev_p; |
69 | ||
70 | /* find predecessor of "ptr"; hw and shadow lists are in sync */ | |
71 | while (here.ptr && here.ptr != ptr) { | |
6dbd682b SR |
72 | prev_p = periodic_next_shadow(ehci, prev_p, |
73 | Q_NEXT_TYPE(ehci, *hw_p)); | |
1da177e4 LT |
74 | hw_p = here.hw_next; |
75 | here = *prev_p; | |
76 | } | |
77 | /* an interrupt entry (at list end) could have been shared */ | |
78 | if (!here.ptr) | |
79 | return; | |
80 | ||
81 | /* update shadow and hardware lists ... the old "next" pointers | |
82 | * from ptr may still be in use, the caller updates them. | |
83 | */ | |
6dbd682b SR |
84 | *prev_p = *periodic_next_shadow(ehci, &here, |
85 | Q_NEXT_TYPE(ehci, *hw_p)); | |
1da177e4 LT |
86 | *hw_p = *here.hw_next; |
87 | } | |
88 | ||
89 | /* how many of the uframe's 125 usecs are allocated? */ | |
90 | static unsigned short | |
91 | periodic_usecs (struct ehci_hcd *ehci, unsigned frame, unsigned uframe) | |
92 | { | |
6dbd682b | 93 | __hc32 *hw_p = &ehci->periodic [frame]; |
1da177e4 LT |
94 | union ehci_shadow *q = &ehci->pshadow [frame]; |
95 | unsigned usecs = 0; | |
96 | ||
97 | while (q->ptr) { | |
6dbd682b | 98 | switch (hc32_to_cpu(ehci, Q_NEXT_TYPE(ehci, *hw_p))) { |
1da177e4 LT |
99 | case Q_TYPE_QH: |
100 | /* is it in the S-mask? */ | |
6dbd682b | 101 | if (q->qh->hw_info2 & cpu_to_hc32(ehci, 1 << uframe)) |
1da177e4 LT |
102 | usecs += q->qh->usecs; |
103 | /* ... or C-mask? */ | |
6dbd682b SR |
104 | if (q->qh->hw_info2 & cpu_to_hc32(ehci, |
105 | 1 << (8 + uframe))) | |
1da177e4 LT |
106 | usecs += q->qh->c_usecs; |
107 | hw_p = &q->qh->hw_next; | |
108 | q = &q->qh->qh_next; | |
109 | break; | |
110 | // case Q_TYPE_FSTN: | |
111 | default: | |
112 | /* for "save place" FSTNs, count the relevant INTR | |
113 | * bandwidth from the previous frame | |
114 | */ | |
6dbd682b | 115 | if (q->fstn->hw_prev != EHCI_LIST_END(ehci)) { |
1da177e4 LT |
116 | ehci_dbg (ehci, "ignoring FSTN cost ...\n"); |
117 | } | |
118 | hw_p = &q->fstn->hw_next; | |
119 | q = &q->fstn->fstn_next; | |
120 | break; | |
121 | case Q_TYPE_ITD: | |
3b6fcfd0 KW |
122 | if (q->itd->hw_transaction[uframe]) |
123 | usecs += q->itd->stream->usecs; | |
1da177e4 LT |
124 | hw_p = &q->itd->hw_next; |
125 | q = &q->itd->itd_next; | |
126 | break; | |
127 | case Q_TYPE_SITD: | |
128 | /* is it in the S-mask? (count SPLIT, DATA) */ | |
6dbd682b SR |
129 | if (q->sitd->hw_uframe & cpu_to_hc32(ehci, |
130 | 1 << uframe)) { | |
1da177e4 | 131 | if (q->sitd->hw_fullspeed_ep & |
6dbd682b | 132 | cpu_to_hc32(ehci, 1<<31)) |
1da177e4 LT |
133 | usecs += q->sitd->stream->usecs; |
134 | else /* worst case for OUT start-split */ | |
135 | usecs += HS_USECS_ISO (188); | |
136 | } | |
137 | ||
138 | /* ... C-mask? (count CSPLIT, DATA) */ | |
139 | if (q->sitd->hw_uframe & | |
6dbd682b | 140 | cpu_to_hc32(ehci, 1 << (8 + uframe))) { |
1da177e4 LT |
141 | /* worst case for IN complete-split */ |
142 | usecs += q->sitd->stream->c_usecs; | |
143 | } | |
144 | ||
145 | hw_p = &q->sitd->hw_next; | |
146 | q = &q->sitd->sitd_next; | |
147 | break; | |
148 | } | |
149 | } | |
150 | #ifdef DEBUG | |
151 | if (usecs > 100) | |
152 | ehci_err (ehci, "uframe %d sched overrun: %d usecs\n", | |
153 | frame * 8 + uframe, usecs); | |
154 | #endif | |
155 | return usecs; | |
156 | } | |
157 | ||
158 | /*-------------------------------------------------------------------------*/ | |
159 | ||
160 | static int same_tt (struct usb_device *dev1, struct usb_device *dev2) | |
161 | { | |
162 | if (!dev1->tt || !dev2->tt) | |
163 | return 0; | |
164 | if (dev1->tt != dev2->tt) | |
165 | return 0; | |
166 | if (dev1->tt->multi) | |
167 | return dev1->ttport == dev2->ttport; | |
168 | else | |
169 | return 1; | |
170 | } | |
171 | ||
ba47f66b DS |
172 | #ifdef CONFIG_USB_EHCI_TT_NEWSCHED |
173 | ||
174 | /* Which uframe does the low/fullspeed transfer start in? | |
175 | * | |
176 | * The parameter is the mask of ssplits in "H-frame" terms | |
177 | * and this returns the transfer start uframe in "B-frame" terms, | |
178 | * which allows both to match, e.g. a ssplit in "H-frame" uframe 0 | |
179 | * will cause a transfer in "B-frame" uframe 0. "B-frames" lag | |
180 | * "H-frames" by 1 uframe. See the EHCI spec sec 4.5 and figure 4.7. | |
181 | */ | |
6dbd682b | 182 | static inline unsigned char tt_start_uframe(struct ehci_hcd *ehci, __hc32 mask) |
ba47f66b | 183 | { |
6dbd682b | 184 | unsigned char smask = QH_SMASK & hc32_to_cpu(ehci, mask); |
ba47f66b DS |
185 | if (!smask) { |
186 | ehci_err(ehci, "invalid empty smask!\n"); | |
187 | /* uframe 7 can't have bw so this will indicate failure */ | |
188 | return 7; | |
189 | } | |
190 | return ffs(smask) - 1; | |
191 | } | |
192 | ||
193 | static const unsigned char | |
194 | max_tt_usecs[] = { 125, 125, 125, 125, 125, 125, 30, 0 }; | |
195 | ||
196 | /* carryover low/fullspeed bandwidth that crosses uframe boundries */ | |
197 | static inline void carryover_tt_bandwidth(unsigned short tt_usecs[8]) | |
198 | { | |
199 | int i; | |
200 | for (i=0; i<7; i++) { | |
201 | if (max_tt_usecs[i] < tt_usecs[i]) { | |
202 | tt_usecs[i+1] += tt_usecs[i] - max_tt_usecs[i]; | |
203 | tt_usecs[i] = max_tt_usecs[i]; | |
204 | } | |
205 | } | |
206 | } | |
207 | ||
208 | /* How many of the tt's periodic downstream 1000 usecs are allocated? | |
209 | * | |
210 | * While this measures the bandwidth in terms of usecs/uframe, | |
211 | * the low/fullspeed bus has no notion of uframes, so any particular | |
212 | * low/fullspeed transfer can "carry over" from one uframe to the next, | |
213 | * since the TT just performs downstream transfers in sequence. | |
214 | * | |
dc0d5c1e | 215 | * For example two separate 100 usec transfers can start in the same uframe, |
ba47f66b DS |
216 | * and the second one would "carry over" 75 usecs into the next uframe. |
217 | */ | |
218 | static void | |
219 | periodic_tt_usecs ( | |
220 | struct ehci_hcd *ehci, | |
221 | struct usb_device *dev, | |
222 | unsigned frame, | |
223 | unsigned short tt_usecs[8] | |
224 | ) | |
225 | { | |
6dbd682b | 226 | __hc32 *hw_p = &ehci->periodic [frame]; |
ba47f66b DS |
227 | union ehci_shadow *q = &ehci->pshadow [frame]; |
228 | unsigned char uf; | |
229 | ||
230 | memset(tt_usecs, 0, 16); | |
231 | ||
232 | while (q->ptr) { | |
6dbd682b | 233 | switch (hc32_to_cpu(ehci, Q_NEXT_TYPE(ehci, *hw_p))) { |
ba47f66b DS |
234 | case Q_TYPE_ITD: |
235 | hw_p = &q->itd->hw_next; | |
236 | q = &q->itd->itd_next; | |
237 | continue; | |
238 | case Q_TYPE_QH: | |
239 | if (same_tt(dev, q->qh->dev)) { | |
240 | uf = tt_start_uframe(ehci, q->qh->hw_info2); | |
241 | tt_usecs[uf] += q->qh->tt_usecs; | |
242 | } | |
243 | hw_p = &q->qh->hw_next; | |
244 | q = &q->qh->qh_next; | |
245 | continue; | |
246 | case Q_TYPE_SITD: | |
247 | if (same_tt(dev, q->sitd->urb->dev)) { | |
248 | uf = tt_start_uframe(ehci, q->sitd->hw_uframe); | |
249 | tt_usecs[uf] += q->sitd->stream->tt_usecs; | |
250 | } | |
251 | hw_p = &q->sitd->hw_next; | |
252 | q = &q->sitd->sitd_next; | |
253 | continue; | |
254 | // case Q_TYPE_FSTN: | |
255 | default: | |
6dbd682b SR |
256 | ehci_dbg(ehci, "ignoring periodic frame %d FSTN\n", |
257 | frame); | |
ba47f66b DS |
258 | hw_p = &q->fstn->hw_next; |
259 | q = &q->fstn->fstn_next; | |
260 | } | |
261 | } | |
262 | ||
263 | carryover_tt_bandwidth(tt_usecs); | |
264 | ||
265 | if (max_tt_usecs[7] < tt_usecs[7]) | |
266 | ehci_err(ehci, "frame %d tt sched overrun: %d usecs\n", | |
267 | frame, tt_usecs[7] - max_tt_usecs[7]); | |
268 | } | |
269 | ||
270 | /* | |
271 | * Return true if the device's tt's downstream bus is available for a | |
272 | * periodic transfer of the specified length (usecs), starting at the | |
273 | * specified frame/uframe. Note that (as summarized in section 11.19 | |
274 | * of the usb 2.0 spec) TTs can buffer multiple transactions for each | |
275 | * uframe. | |
276 | * | |
277 | * The uframe parameter is when the fullspeed/lowspeed transfer | |
278 | * should be executed in "B-frame" terms, which is the same as the | |
279 | * highspeed ssplit's uframe (which is in "H-frame" terms). For example | |
280 | * a ssplit in "H-frame" 0 causes a transfer in "B-frame" 0. | |
281 | * See the EHCI spec sec 4.5 and fig 4.7. | |
282 | * | |
283 | * This checks if the full/lowspeed bus, at the specified starting uframe, | |
284 | * has the specified bandwidth available, according to rules listed | |
285 | * in USB 2.0 spec section 11.18.1 fig 11-60. | |
286 | * | |
287 | * This does not check if the transfer would exceed the max ssplit | |
288 | * limit of 16, specified in USB 2.0 spec section 11.18.4 requirement #4, | |
289 | * since proper scheduling limits ssplits to less than 16 per uframe. | |
290 | */ | |
291 | static int tt_available ( | |
292 | struct ehci_hcd *ehci, | |
293 | unsigned period, | |
294 | struct usb_device *dev, | |
295 | unsigned frame, | |
296 | unsigned uframe, | |
297 | u16 usecs | |
298 | ) | |
299 | { | |
300 | if ((period == 0) || (uframe >= 7)) /* error */ | |
301 | return 0; | |
302 | ||
303 | for (; frame < ehci->periodic_size; frame += period) { | |
304 | unsigned short tt_usecs[8]; | |
305 | ||
306 | periodic_tt_usecs (ehci, dev, frame, tt_usecs); | |
307 | ||
308 | ehci_vdbg(ehci, "tt frame %d check %d usecs start uframe %d in" | |
309 | " schedule %d/%d/%d/%d/%d/%d/%d/%d\n", | |
310 | frame, usecs, uframe, | |
311 | tt_usecs[0], tt_usecs[1], tt_usecs[2], tt_usecs[3], | |
312 | tt_usecs[4], tt_usecs[5], tt_usecs[6], tt_usecs[7]); | |
313 | ||
314 | if (max_tt_usecs[uframe] <= tt_usecs[uframe]) { | |
315 | ehci_vdbg(ehci, "frame %d uframe %d fully scheduled\n", | |
316 | frame, uframe); | |
317 | return 0; | |
318 | } | |
319 | ||
320 | /* special case for isoc transfers larger than 125us: | |
321 | * the first and each subsequent fully used uframe | |
322 | * must be empty, so as to not illegally delay | |
323 | * already scheduled transactions | |
324 | */ | |
325 | if (125 < usecs) { | |
c065c60e | 326 | int ufs = (usecs / 125); |
ba47f66b DS |
327 | int i; |
328 | for (i = uframe; i < (uframe + ufs) && i < 8; i++) | |
329 | if (0 < tt_usecs[i]) { | |
330 | ehci_vdbg(ehci, | |
331 | "multi-uframe xfer can't fit " | |
332 | "in frame %d uframe %d\n", | |
333 | frame, i); | |
334 | return 0; | |
335 | } | |
336 | } | |
337 | ||
338 | tt_usecs[uframe] += usecs; | |
339 | ||
340 | carryover_tt_bandwidth(tt_usecs); | |
341 | ||
342 | /* fail if the carryover pushed bw past the last uframe's limit */ | |
343 | if (max_tt_usecs[7] < tt_usecs[7]) { | |
344 | ehci_vdbg(ehci, | |
345 | "tt unavailable usecs %d frame %d uframe %d\n", | |
346 | usecs, frame, uframe); | |
347 | return 0; | |
348 | } | |
349 | } | |
350 | ||
351 | return 1; | |
352 | } | |
353 | ||
354 | #else | |
355 | ||
1da177e4 LT |
356 | /* return true iff the device's transaction translator is available |
357 | * for a periodic transfer starting at the specified frame, using | |
358 | * all the uframes in the mask. | |
359 | */ | |
360 | static int tt_no_collision ( | |
361 | struct ehci_hcd *ehci, | |
362 | unsigned period, | |
363 | struct usb_device *dev, | |
364 | unsigned frame, | |
365 | u32 uf_mask | |
366 | ) | |
367 | { | |
368 | if (period == 0) /* error */ | |
369 | return 0; | |
370 | ||
371 | /* note bandwidth wastage: split never follows csplit | |
372 | * (different dev or endpoint) until the next uframe. | |
373 | * calling convention doesn't make that distinction. | |
374 | */ | |
375 | for (; frame < ehci->periodic_size; frame += period) { | |
376 | union ehci_shadow here; | |
6dbd682b | 377 | __hc32 type; |
1da177e4 LT |
378 | |
379 | here = ehci->pshadow [frame]; | |
6dbd682b | 380 | type = Q_NEXT_TYPE(ehci, ehci->periodic [frame]); |
1da177e4 | 381 | while (here.ptr) { |
6dbd682b | 382 | switch (hc32_to_cpu(ehci, type)) { |
1da177e4 | 383 | case Q_TYPE_ITD: |
6dbd682b | 384 | type = Q_NEXT_TYPE(ehci, here.itd->hw_next); |
1da177e4 LT |
385 | here = here.itd->itd_next; |
386 | continue; | |
387 | case Q_TYPE_QH: | |
388 | if (same_tt (dev, here.qh->dev)) { | |
389 | u32 mask; | |
390 | ||
6dbd682b SR |
391 | mask = hc32_to_cpu(ehci, |
392 | here.qh->hw_info2); | |
1da177e4 LT |
393 | /* "knows" no gap is needed */ |
394 | mask |= mask >> 8; | |
395 | if (mask & uf_mask) | |
396 | break; | |
397 | } | |
6dbd682b | 398 | type = Q_NEXT_TYPE(ehci, here.qh->hw_next); |
1da177e4 LT |
399 | here = here.qh->qh_next; |
400 | continue; | |
401 | case Q_TYPE_SITD: | |
402 | if (same_tt (dev, here.sitd->urb->dev)) { | |
403 | u16 mask; | |
404 | ||
6dbd682b | 405 | mask = hc32_to_cpu(ehci, here.sitd |
1da177e4 LT |
406 | ->hw_uframe); |
407 | /* FIXME assumes no gap for IN! */ | |
408 | mask |= mask >> 8; | |
409 | if (mask & uf_mask) | |
410 | break; | |
411 | } | |
6dbd682b | 412 | type = Q_NEXT_TYPE(ehci, here.sitd->hw_next); |
1da177e4 LT |
413 | here = here.sitd->sitd_next; |
414 | continue; | |
415 | // case Q_TYPE_FSTN: | |
416 | default: | |
417 | ehci_dbg (ehci, | |
418 | "periodic frame %d bogus type %d\n", | |
419 | frame, type); | |
420 | } | |
421 | ||
422 | /* collision or error */ | |
423 | return 0; | |
424 | } | |
425 | } | |
426 | ||
427 | /* no collision */ | |
428 | return 1; | |
429 | } | |
430 | ||
ba47f66b DS |
431 | #endif /* CONFIG_USB_EHCI_TT_NEWSCHED */ |
432 | ||
1da177e4 LT |
433 | /*-------------------------------------------------------------------------*/ |
434 | ||
435 | static int enable_periodic (struct ehci_hcd *ehci) | |
436 | { | |
437 | u32 cmd; | |
438 | int status; | |
439 | ||
01c17142 DB |
440 | if (ehci->periodic_sched++) |
441 | return 0; | |
442 | ||
1da177e4 LT |
443 | /* did clearing PSE did take effect yet? |
444 | * takes effect only at frame boundaries... | |
445 | */ | |
c765d4ca KW |
446 | status = handshake_on_error_set_halt(ehci, &ehci->regs->status, |
447 | STS_PSS, 0, 9 * 125); | |
448 | if (status) | |
1da177e4 | 449 | return status; |
1da177e4 | 450 | |
083522d7 BH |
451 | cmd = ehci_readl(ehci, &ehci->regs->command) | CMD_PSE; |
452 | ehci_writel(ehci, cmd, &ehci->regs->command); | |
1da177e4 LT |
453 | /* posted write ... PSS happens later */ |
454 | ehci_to_hcd(ehci)->state = HC_STATE_RUNNING; | |
455 | ||
456 | /* make sure ehci_work scans these */ | |
083522d7 BH |
457 | ehci->next_uframe = ehci_readl(ehci, &ehci->regs->frame_index) |
458 | % (ehci->periodic_size << 3); | |
1da177e4 LT |
459 | return 0; |
460 | } | |
461 | ||
462 | static int disable_periodic (struct ehci_hcd *ehci) | |
463 | { | |
464 | u32 cmd; | |
465 | int status; | |
466 | ||
01c17142 DB |
467 | if (--ehci->periodic_sched) |
468 | return 0; | |
469 | ||
1da177e4 LT |
470 | /* did setting PSE not take effect yet? |
471 | * takes effect only at frame boundaries... | |
472 | */ | |
c765d4ca KW |
473 | status = handshake_on_error_set_halt(ehci, &ehci->regs->status, |
474 | STS_PSS, STS_PSS, 9 * 125); | |
475 | if (status) | |
1da177e4 | 476 | return status; |
1da177e4 | 477 | |
083522d7 BH |
478 | cmd = ehci_readl(ehci, &ehci->regs->command) & ~CMD_PSE; |
479 | ehci_writel(ehci, cmd, &ehci->regs->command); | |
1da177e4 LT |
480 | /* posted write ... */ |
481 | ||
482 | ehci->next_uframe = -1; | |
483 | return 0; | |
484 | } | |
485 | ||
486 | /*-------------------------------------------------------------------------*/ | |
487 | ||
488 | /* periodic schedule slots have iso tds (normal or split) first, then a | |
489 | * sparse tree for active interrupt transfers. | |
490 | * | |
491 | * this just links in a qh; caller guarantees uframe masks are set right. | |
492 | * no FSTN support (yet; ehci 0.96+) | |
493 | */ | |
494 | static int qh_link_periodic (struct ehci_hcd *ehci, struct ehci_qh *qh) | |
495 | { | |
496 | unsigned i; | |
497 | unsigned period = qh->period; | |
498 | ||
499 | dev_dbg (&qh->dev->dev, | |
500 | "link qh%d-%04x/%p start %d [%d/%d us]\n", | |
6dbd682b | 501 | period, hc32_to_cpup(ehci, &qh->hw_info2) & (QH_CMASK | QH_SMASK), |
1da177e4 LT |
502 | qh, qh->start, qh->usecs, qh->c_usecs); |
503 | ||
504 | /* high bandwidth, or otherwise every microframe */ | |
505 | if (period == 0) | |
506 | period = 1; | |
507 | ||
508 | for (i = qh->start; i < ehci->periodic_size; i += period) { | |
6dbd682b SR |
509 | union ehci_shadow *prev = &ehci->pshadow[i]; |
510 | __hc32 *hw_p = &ehci->periodic[i]; | |
1da177e4 | 511 | union ehci_shadow here = *prev; |
6dbd682b | 512 | __hc32 type = 0; |
1da177e4 LT |
513 | |
514 | /* skip the iso nodes at list head */ | |
515 | while (here.ptr) { | |
6dbd682b SR |
516 | type = Q_NEXT_TYPE(ehci, *hw_p); |
517 | if (type == cpu_to_hc32(ehci, Q_TYPE_QH)) | |
1da177e4 | 518 | break; |
6dbd682b | 519 | prev = periodic_next_shadow(ehci, prev, type); |
1da177e4 LT |
520 | hw_p = &here.qh->hw_next; |
521 | here = *prev; | |
522 | } | |
523 | ||
524 | /* sorting each branch by period (slow-->fast) | |
525 | * enables sharing interior tree nodes | |
526 | */ | |
527 | while (here.ptr && qh != here.qh) { | |
528 | if (qh->period > here.qh->period) | |
529 | break; | |
530 | prev = &here.qh->qh_next; | |
531 | hw_p = &here.qh->hw_next; | |
532 | here = *prev; | |
533 | } | |
534 | /* link in this qh, unless some earlier pass did that */ | |
535 | if (qh != here.qh) { | |
536 | qh->qh_next = here; | |
537 | if (here.qh) | |
538 | qh->hw_next = *hw_p; | |
539 | wmb (); | |
540 | prev->qh = qh; | |
6dbd682b | 541 | *hw_p = QH_NEXT (ehci, qh->qh_dma); |
1da177e4 LT |
542 | } |
543 | } | |
544 | qh->qh_state = QH_STATE_LINKED; | |
545 | qh_get (qh); | |
546 | ||
547 | /* update per-qh bandwidth for usbfs */ | |
548 | ehci_to_hcd(ehci)->self.bandwidth_allocated += qh->period | |
549 | ? ((qh->usecs + qh->c_usecs) / qh->period) | |
550 | : (qh->usecs * 8); | |
551 | ||
552 | /* maybe enable periodic schedule processing */ | |
01c17142 | 553 | return enable_periodic(ehci); |
1da177e4 LT |
554 | } |
555 | ||
01c17142 | 556 | static int qh_unlink_periodic(struct ehci_hcd *ehci, struct ehci_qh *qh) |
1da177e4 LT |
557 | { |
558 | unsigned i; | |
559 | unsigned period; | |
560 | ||
561 | // FIXME: | |
562 | // IF this isn't high speed | |
563 | // and this qh is active in the current uframe | |
564 | // (and overlay token SplitXstate is false?) | |
565 | // THEN | |
551509d2 | 566 | // qh->hw_info1 |= cpu_to_hc32(1 << 7 /* "ignore" */); |
1da177e4 LT |
567 | |
568 | /* high bandwidth, or otherwise part of every microframe */ | |
569 | if ((period = qh->period) == 0) | |
570 | period = 1; | |
571 | ||
572 | for (i = qh->start; i < ehci->periodic_size; i += period) | |
573 | periodic_unlink (ehci, i, qh); | |
574 | ||
575 | /* update per-qh bandwidth for usbfs */ | |
576 | ehci_to_hcd(ehci)->self.bandwidth_allocated -= qh->period | |
577 | ? ((qh->usecs + qh->c_usecs) / qh->period) | |
578 | : (qh->usecs * 8); | |
579 | ||
580 | dev_dbg (&qh->dev->dev, | |
581 | "unlink qh%d-%04x/%p start %d [%d/%d us]\n", | |
7dedacf4 | 582 | qh->period, |
6dbd682b | 583 | hc32_to_cpup(ehci, &qh->hw_info2) & (QH_CMASK | QH_SMASK), |
1da177e4 LT |
584 | qh, qh->start, qh->usecs, qh->c_usecs); |
585 | ||
586 | /* qh->qh_next still "live" to HC */ | |
587 | qh->qh_state = QH_STATE_UNLINK; | |
588 | qh->qh_next.ptr = NULL; | |
589 | qh_put (qh); | |
590 | ||
591 | /* maybe turn off periodic schedule */ | |
01c17142 | 592 | return disable_periodic(ehci); |
1da177e4 LT |
593 | } |
594 | ||
595 | static void intr_deschedule (struct ehci_hcd *ehci, struct ehci_qh *qh) | |
596 | { | |
597 | unsigned wait; | |
598 | ||
599 | qh_unlink_periodic (ehci, qh); | |
600 | ||
601 | /* simple/paranoid: always delay, expecting the HC needs to read | |
602 | * qh->hw_next or finish a writeback after SPLIT/CSPLIT ... and | |
603 | * expect khubd to clean up after any CSPLITs we won't issue. | |
604 | * active high speed queues may need bigger delays... | |
605 | */ | |
606 | if (list_empty (&qh->qtd_list) | |
6dbd682b | 607 | || (cpu_to_hc32(ehci, QH_CMASK) |
1da177e4 LT |
608 | & qh->hw_info2) != 0) |
609 | wait = 2; | |
610 | else | |
611 | wait = 55; /* worst case: 3 * 1024 */ | |
612 | ||
613 | udelay (wait); | |
614 | qh->qh_state = QH_STATE_IDLE; | |
6dbd682b | 615 | qh->hw_next = EHCI_LIST_END(ehci); |
1da177e4 LT |
616 | wmb (); |
617 | } | |
618 | ||
619 | /*-------------------------------------------------------------------------*/ | |
620 | ||
621 | static int check_period ( | |
53bd6a60 | 622 | struct ehci_hcd *ehci, |
1da177e4 LT |
623 | unsigned frame, |
624 | unsigned uframe, | |
625 | unsigned period, | |
626 | unsigned usecs | |
627 | ) { | |
628 | int claimed; | |
629 | ||
630 | /* complete split running into next frame? | |
631 | * given FSTN support, we could sometimes check... | |
632 | */ | |
633 | if (uframe >= 8) | |
634 | return 0; | |
635 | ||
636 | /* | |
637 | * 80% periodic == 100 usec/uframe available | |
53bd6a60 | 638 | * convert "usecs we need" to "max already claimed" |
1da177e4 LT |
639 | */ |
640 | usecs = 100 - usecs; | |
641 | ||
642 | /* we "know" 2 and 4 uframe intervals were rejected; so | |
643 | * for period 0, check _every_ microframe in the schedule. | |
644 | */ | |
645 | if (unlikely (period == 0)) { | |
646 | do { | |
647 | for (uframe = 0; uframe < 7; uframe++) { | |
648 | claimed = periodic_usecs (ehci, frame, uframe); | |
649 | if (claimed > usecs) | |
650 | return 0; | |
651 | } | |
652 | } while ((frame += 1) < ehci->periodic_size); | |
653 | ||
654 | /* just check the specified uframe, at that period */ | |
655 | } else { | |
656 | do { | |
657 | claimed = periodic_usecs (ehci, frame, uframe); | |
658 | if (claimed > usecs) | |
659 | return 0; | |
660 | } while ((frame += period) < ehci->periodic_size); | |
661 | } | |
662 | ||
663 | // success! | |
664 | return 1; | |
665 | } | |
666 | ||
667 | static int check_intr_schedule ( | |
53bd6a60 | 668 | struct ehci_hcd *ehci, |
1da177e4 LT |
669 | unsigned frame, |
670 | unsigned uframe, | |
671 | const struct ehci_qh *qh, | |
6dbd682b | 672 | __hc32 *c_maskp |
1da177e4 LT |
673 | ) |
674 | { | |
53bd6a60 | 675 | int retval = -ENOSPC; |
ba47f66b | 676 | u8 mask = 0; |
1da177e4 LT |
677 | |
678 | if (qh->c_usecs && uframe >= 6) /* FSTN territory? */ | |
679 | goto done; | |
680 | ||
681 | if (!check_period (ehci, frame, uframe, qh->period, qh->usecs)) | |
682 | goto done; | |
683 | if (!qh->c_usecs) { | |
684 | retval = 0; | |
685 | *c_maskp = 0; | |
686 | goto done; | |
687 | } | |
688 | ||
ba47f66b DS |
689 | #ifdef CONFIG_USB_EHCI_TT_NEWSCHED |
690 | if (tt_available (ehci, qh->period, qh->dev, frame, uframe, | |
691 | qh->tt_usecs)) { | |
692 | unsigned i; | |
693 | ||
694 | /* TODO : this may need FSTN for SSPLIT in uframe 5. */ | |
695 | for (i=uframe+1; i<8 && i<uframe+4; i++) | |
696 | if (!check_period (ehci, frame, i, | |
697 | qh->period, qh->c_usecs)) | |
698 | goto done; | |
699 | else | |
700 | mask |= 1 << i; | |
701 | ||
702 | retval = 0; | |
703 | ||
6dbd682b | 704 | *c_maskp = cpu_to_hc32(ehci, mask << 8); |
ba47f66b DS |
705 | } |
706 | #else | |
1da177e4 LT |
707 | /* Make sure this tt's buffer is also available for CSPLITs. |
708 | * We pessimize a bit; probably the typical full speed case | |
709 | * doesn't need the second CSPLIT. | |
53bd6a60 | 710 | * |
1da177e4 LT |
711 | * NOTE: both SPLIT and CSPLIT could be checked in just |
712 | * one smart pass... | |
713 | */ | |
714 | mask = 0x03 << (uframe + qh->gap_uf); | |
6dbd682b | 715 | *c_maskp = cpu_to_hc32(ehci, mask << 8); |
1da177e4 LT |
716 | |
717 | mask |= 1 << uframe; | |
718 | if (tt_no_collision (ehci, qh->period, qh->dev, frame, mask)) { | |
719 | if (!check_period (ehci, frame, uframe + qh->gap_uf + 1, | |
720 | qh->period, qh->c_usecs)) | |
721 | goto done; | |
722 | if (!check_period (ehci, frame, uframe + qh->gap_uf, | |
723 | qh->period, qh->c_usecs)) | |
724 | goto done; | |
725 | retval = 0; | |
726 | } | |
ba47f66b | 727 | #endif |
1da177e4 LT |
728 | done: |
729 | return retval; | |
730 | } | |
731 | ||
732 | /* "first fit" scheduling policy used the first time through, | |
733 | * or when the previous schedule slot can't be re-used. | |
734 | */ | |
6dbd682b | 735 | static int qh_schedule(struct ehci_hcd *ehci, struct ehci_qh *qh) |
1da177e4 | 736 | { |
53bd6a60 | 737 | int status; |
1da177e4 | 738 | unsigned uframe; |
6dbd682b | 739 | __hc32 c_mask; |
1da177e4 LT |
740 | unsigned frame; /* 0..(qh->period - 1), or NO_FRAME */ |
741 | ||
742 | qh_refresh(ehci, qh); | |
6dbd682b | 743 | qh->hw_next = EHCI_LIST_END(ehci); |
1da177e4 LT |
744 | frame = qh->start; |
745 | ||
746 | /* reuse the previous schedule slots, if we can */ | |
747 | if (frame < qh->period) { | |
6dbd682b | 748 | uframe = ffs(hc32_to_cpup(ehci, &qh->hw_info2) & QH_SMASK); |
1da177e4 LT |
749 | status = check_intr_schedule (ehci, frame, --uframe, |
750 | qh, &c_mask); | |
751 | } else { | |
752 | uframe = 0; | |
753 | c_mask = 0; | |
754 | status = -ENOSPC; | |
755 | } | |
756 | ||
757 | /* else scan the schedule to find a group of slots such that all | |
758 | * uframes have enough periodic bandwidth available. | |
759 | */ | |
760 | if (status) { | |
761 | /* "normal" case, uframing flexible except with splits */ | |
762 | if (qh->period) { | |
68335e81 AS |
763 | int i; |
764 | ||
765 | for (i = qh->period; status && i > 0; --i) { | |
766 | frame = ++ehci->random_frame % qh->period; | |
1da177e4 LT |
767 | for (uframe = 0; uframe < 8; uframe++) { |
768 | status = check_intr_schedule (ehci, | |
769 | frame, uframe, qh, | |
770 | &c_mask); | |
771 | if (status == 0) | |
772 | break; | |
773 | } | |
68335e81 | 774 | } |
1da177e4 LT |
775 | |
776 | /* qh->period == 0 means every uframe */ | |
777 | } else { | |
778 | frame = 0; | |
779 | status = check_intr_schedule (ehci, 0, 0, qh, &c_mask); | |
780 | } | |
781 | if (status) | |
782 | goto done; | |
783 | qh->start = frame; | |
784 | ||
785 | /* reset S-frame and (maybe) C-frame masks */ | |
6dbd682b | 786 | qh->hw_info2 &= cpu_to_hc32(ehci, ~(QH_CMASK | QH_SMASK)); |
1da177e4 | 787 | qh->hw_info2 |= qh->period |
6dbd682b SR |
788 | ? cpu_to_hc32(ehci, 1 << uframe) |
789 | : cpu_to_hc32(ehci, QH_SMASK); | |
1da177e4 LT |
790 | qh->hw_info2 |= c_mask; |
791 | } else | |
792 | ehci_dbg (ehci, "reused qh %p schedule\n", qh); | |
793 | ||
794 | /* stuff into the periodic schedule */ | |
53bd6a60 | 795 | status = qh_link_periodic (ehci, qh); |
1da177e4 LT |
796 | done: |
797 | return status; | |
798 | } | |
799 | ||
800 | static int intr_submit ( | |
801 | struct ehci_hcd *ehci, | |
1da177e4 LT |
802 | struct urb *urb, |
803 | struct list_head *qtd_list, | |
55016f10 | 804 | gfp_t mem_flags |
1da177e4 LT |
805 | ) { |
806 | unsigned epnum; | |
807 | unsigned long flags; | |
808 | struct ehci_qh *qh; | |
e9df41c5 | 809 | int status; |
1da177e4 LT |
810 | struct list_head empty; |
811 | ||
812 | /* get endpoint and transfer/schedule data */ | |
e9df41c5 | 813 | epnum = urb->ep->desc.bEndpointAddress; |
1da177e4 LT |
814 | |
815 | spin_lock_irqsave (&ehci->lock, flags); | |
816 | ||
8de98402 | 817 | if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, |
6dbd682b | 818 | &ehci_to_hcd(ehci)->flags))) { |
8de98402 | 819 | status = -ESHUTDOWN; |
e9df41c5 | 820 | goto done_not_linked; |
8de98402 | 821 | } |
e9df41c5 AS |
822 | status = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb); |
823 | if (unlikely(status)) | |
824 | goto done_not_linked; | |
8de98402 | 825 | |
1da177e4 LT |
826 | /* get qh and force any scheduling errors */ |
827 | INIT_LIST_HEAD (&empty); | |
e9df41c5 | 828 | qh = qh_append_tds(ehci, urb, &empty, epnum, &urb->ep->hcpriv); |
1da177e4 LT |
829 | if (qh == NULL) { |
830 | status = -ENOMEM; | |
831 | goto done; | |
832 | } | |
833 | if (qh->qh_state == QH_STATE_IDLE) { | |
834 | if ((status = qh_schedule (ehci, qh)) != 0) | |
835 | goto done; | |
836 | } | |
837 | ||
838 | /* then queue the urb's tds to the qh */ | |
e9df41c5 | 839 | qh = qh_append_tds(ehci, urb, qtd_list, epnum, &urb->ep->hcpriv); |
1da177e4 LT |
840 | BUG_ON (qh == NULL); |
841 | ||
842 | /* ... update usbfs periodic stats */ | |
843 | ehci_to_hcd(ehci)->self.bandwidth_int_reqs++; | |
844 | ||
845 | done: | |
e9df41c5 AS |
846 | if (unlikely(status)) |
847 | usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb); | |
848 | done_not_linked: | |
1da177e4 LT |
849 | spin_unlock_irqrestore (&ehci->lock, flags); |
850 | if (status) | |
851 | qtd_list_free (ehci, urb, qtd_list); | |
852 | ||
853 | return status; | |
854 | } | |
855 | ||
856 | /*-------------------------------------------------------------------------*/ | |
857 | ||
858 | /* ehci_iso_stream ops work with both ITD and SITD */ | |
859 | ||
860 | static struct ehci_iso_stream * | |
55016f10 | 861 | iso_stream_alloc (gfp_t mem_flags) |
1da177e4 LT |
862 | { |
863 | struct ehci_iso_stream *stream; | |
864 | ||
7b842b6e | 865 | stream = kzalloc(sizeof *stream, mem_flags); |
1da177e4 | 866 | if (likely (stream != NULL)) { |
1da177e4 LT |
867 | INIT_LIST_HEAD(&stream->td_list); |
868 | INIT_LIST_HEAD(&stream->free_list); | |
869 | stream->next_uframe = -1; | |
870 | stream->refcount = 1; | |
871 | } | |
872 | return stream; | |
873 | } | |
874 | ||
875 | static void | |
876 | iso_stream_init ( | |
877 | struct ehci_hcd *ehci, | |
878 | struct ehci_iso_stream *stream, | |
879 | struct usb_device *dev, | |
880 | int pipe, | |
881 | unsigned interval | |
882 | ) | |
883 | { | |
884 | static const u8 smask_out [] = { 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f }; | |
885 | ||
886 | u32 buf1; | |
887 | unsigned epnum, maxp; | |
888 | int is_input; | |
889 | long bandwidth; | |
890 | ||
891 | /* | |
892 | * this might be a "high bandwidth" highspeed endpoint, | |
893 | * as encoded in the ep descriptor's wMaxPacket field | |
894 | */ | |
895 | epnum = usb_pipeendpoint (pipe); | |
896 | is_input = usb_pipein (pipe) ? USB_DIR_IN : 0; | |
897 | maxp = usb_maxpacket(dev, pipe, !is_input); | |
898 | if (is_input) { | |
899 | buf1 = (1 << 11); | |
900 | } else { | |
901 | buf1 = 0; | |
902 | } | |
903 | ||
904 | /* knows about ITD vs SITD */ | |
905 | if (dev->speed == USB_SPEED_HIGH) { | |
906 | unsigned multi = hb_mult(maxp); | |
907 | ||
908 | stream->highspeed = 1; | |
909 | ||
910 | maxp = max_packet(maxp); | |
911 | buf1 |= maxp; | |
912 | maxp *= multi; | |
913 | ||
6dbd682b SR |
914 | stream->buf0 = cpu_to_hc32(ehci, (epnum << 8) | dev->devnum); |
915 | stream->buf1 = cpu_to_hc32(ehci, buf1); | |
916 | stream->buf2 = cpu_to_hc32(ehci, multi); | |
1da177e4 LT |
917 | |
918 | /* usbfs wants to report the average usecs per frame tied up | |
919 | * when transfers on this endpoint are scheduled ... | |
920 | */ | |
921 | stream->usecs = HS_USECS_ISO (maxp); | |
922 | bandwidth = stream->usecs * 8; | |
372dd6e8 | 923 | bandwidth /= interval; |
1da177e4 LT |
924 | |
925 | } else { | |
926 | u32 addr; | |
d0384200 | 927 | int think_time; |
469d0229 | 928 | int hs_transfers; |
1da177e4 LT |
929 | |
930 | addr = dev->ttport << 24; | |
931 | if (!ehci_is_TDI(ehci) | |
932 | || (dev->tt->hub != | |
933 | ehci_to_hcd(ehci)->self.root_hub)) | |
934 | addr |= dev->tt->hub->devnum << 16; | |
935 | addr |= epnum << 8; | |
936 | addr |= dev->devnum; | |
937 | stream->usecs = HS_USECS_ISO (maxp); | |
d0384200 | 938 | think_time = dev->tt ? dev->tt->think_time : 0; |
939 | stream->tt_usecs = NS_TO_US (think_time + usb_calc_bus_time ( | |
940 | dev->speed, is_input, 1, maxp)); | |
469d0229 | 941 | hs_transfers = max (1u, (maxp + 187) / 188); |
1da177e4 LT |
942 | if (is_input) { |
943 | u32 tmp; | |
944 | ||
945 | addr |= 1 << 31; | |
946 | stream->c_usecs = stream->usecs; | |
947 | stream->usecs = HS_USECS_ISO (1); | |
948 | stream->raw_mask = 1; | |
949 | ||
469d0229 CL |
950 | /* c-mask as specified in USB 2.0 11.18.4 3.c */ |
951 | tmp = (1 << (hs_transfers + 2)) - 1; | |
952 | stream->raw_mask |= tmp << (8 + 2); | |
1da177e4 | 953 | } else |
469d0229 | 954 | stream->raw_mask = smask_out [hs_transfers - 1]; |
1da177e4 | 955 | bandwidth = stream->usecs + stream->c_usecs; |
372dd6e8 | 956 | bandwidth /= interval << 3; |
1da177e4 LT |
957 | |
958 | /* stream->splits gets created from raw_mask later */ | |
6dbd682b | 959 | stream->address = cpu_to_hc32(ehci, addr); |
1da177e4 LT |
960 | } |
961 | stream->bandwidth = bandwidth; | |
962 | ||
963 | stream->udev = dev; | |
964 | ||
965 | stream->bEndpointAddress = is_input | epnum; | |
966 | stream->interval = interval; | |
967 | stream->maxp = maxp; | |
968 | } | |
969 | ||
970 | static void | |
971 | iso_stream_put(struct ehci_hcd *ehci, struct ehci_iso_stream *stream) | |
972 | { | |
973 | stream->refcount--; | |
974 | ||
975 | /* free whenever just a dev->ep reference remains. | |
976 | * not like a QH -- no persistent state (toggle, halt) | |
977 | */ | |
978 | if (stream->refcount == 1) { | |
979 | int is_in; | |
980 | ||
981 | // BUG_ON (!list_empty(&stream->td_list)); | |
982 | ||
983 | while (!list_empty (&stream->free_list)) { | |
984 | struct list_head *entry; | |
985 | ||
986 | entry = stream->free_list.next; | |
987 | list_del (entry); | |
988 | ||
989 | /* knows about ITD vs SITD */ | |
990 | if (stream->highspeed) { | |
991 | struct ehci_itd *itd; | |
992 | ||
993 | itd = list_entry (entry, struct ehci_itd, | |
994 | itd_list); | |
995 | dma_pool_free (ehci->itd_pool, itd, | |
996 | itd->itd_dma); | |
997 | } else { | |
998 | struct ehci_sitd *sitd; | |
999 | ||
1000 | sitd = list_entry (entry, struct ehci_sitd, | |
1001 | sitd_list); | |
1002 | dma_pool_free (ehci->sitd_pool, sitd, | |
1003 | sitd->sitd_dma); | |
1004 | } | |
1005 | } | |
1006 | ||
1007 | is_in = (stream->bEndpointAddress & USB_DIR_IN) ? 0x10 : 0; | |
1008 | stream->bEndpointAddress &= 0x0f; | |
9aa09d2f KW |
1009 | if (stream->ep) |
1010 | stream->ep->hcpriv = NULL; | |
1da177e4 LT |
1011 | |
1012 | if (stream->rescheduled) { | |
1013 | ehci_info (ehci, "ep%d%s-iso rescheduled " | |
1014 | "%lu times in %lu seconds\n", | |
1015 | stream->bEndpointAddress, is_in ? "in" : "out", | |
1016 | stream->rescheduled, | |
1017 | ((jiffies - stream->start)/HZ) | |
1018 | ); | |
1019 | } | |
1020 | ||
1021 | kfree(stream); | |
1022 | } | |
1023 | } | |
1024 | ||
1025 | static inline struct ehci_iso_stream * | |
1026 | iso_stream_get (struct ehci_iso_stream *stream) | |
1027 | { | |
1028 | if (likely (stream != NULL)) | |
1029 | stream->refcount++; | |
1030 | return stream; | |
1031 | } | |
1032 | ||
1033 | static struct ehci_iso_stream * | |
1034 | iso_stream_find (struct ehci_hcd *ehci, struct urb *urb) | |
1035 | { | |
1036 | unsigned epnum; | |
1037 | struct ehci_iso_stream *stream; | |
1038 | struct usb_host_endpoint *ep; | |
1039 | unsigned long flags; | |
1040 | ||
1041 | epnum = usb_pipeendpoint (urb->pipe); | |
1042 | if (usb_pipein(urb->pipe)) | |
1043 | ep = urb->dev->ep_in[epnum]; | |
1044 | else | |
1045 | ep = urb->dev->ep_out[epnum]; | |
1046 | ||
1047 | spin_lock_irqsave (&ehci->lock, flags); | |
1048 | stream = ep->hcpriv; | |
1049 | ||
1050 | if (unlikely (stream == NULL)) { | |
1051 | stream = iso_stream_alloc(GFP_ATOMIC); | |
1052 | if (likely (stream != NULL)) { | |
1053 | /* dev->ep owns the initial refcount */ | |
1054 | ep->hcpriv = stream; | |
1055 | stream->ep = ep; | |
1056 | iso_stream_init(ehci, stream, urb->dev, urb->pipe, | |
1057 | urb->interval); | |
1058 | } | |
1059 | ||
1060 | /* if dev->ep [epnum] is a QH, info1.maxpacket is nonzero */ | |
1061 | } else if (unlikely (stream->hw_info1 != 0)) { | |
1062 | ehci_dbg (ehci, "dev %s ep%d%s, not iso??\n", | |
1063 | urb->dev->devpath, epnum, | |
1064 | usb_pipein(urb->pipe) ? "in" : "out"); | |
1065 | stream = NULL; | |
1066 | } | |
1067 | ||
1068 | /* caller guarantees an eventual matching iso_stream_put */ | |
1069 | stream = iso_stream_get (stream); | |
1070 | ||
1071 | spin_unlock_irqrestore (&ehci->lock, flags); | |
1072 | return stream; | |
1073 | } | |
1074 | ||
1075 | /*-------------------------------------------------------------------------*/ | |
1076 | ||
1077 | /* ehci_iso_sched ops can be ITD-only or SITD-only */ | |
1078 | ||
1079 | static struct ehci_iso_sched * | |
55016f10 | 1080 | iso_sched_alloc (unsigned packets, gfp_t mem_flags) |
1da177e4 LT |
1081 | { |
1082 | struct ehci_iso_sched *iso_sched; | |
1083 | int size = sizeof *iso_sched; | |
1084 | ||
1085 | size += packets * sizeof (struct ehci_iso_packet); | |
80b6ca48 | 1086 | iso_sched = kzalloc(size, mem_flags); |
1da177e4 | 1087 | if (likely (iso_sched != NULL)) { |
1da177e4 LT |
1088 | INIT_LIST_HEAD (&iso_sched->td_list); |
1089 | } | |
1090 | return iso_sched; | |
1091 | } | |
1092 | ||
1093 | static inline void | |
6dbd682b SR |
1094 | itd_sched_init( |
1095 | struct ehci_hcd *ehci, | |
1da177e4 LT |
1096 | struct ehci_iso_sched *iso_sched, |
1097 | struct ehci_iso_stream *stream, | |
1098 | struct urb *urb | |
1099 | ) | |
1100 | { | |
1101 | unsigned i; | |
1102 | dma_addr_t dma = urb->transfer_dma; | |
1103 | ||
1104 | /* how many uframes are needed for these transfers */ | |
1105 | iso_sched->span = urb->number_of_packets * stream->interval; | |
1106 | ||
1107 | /* figure out per-uframe itd fields that we'll need later | |
1108 | * when we fit new itds into the schedule. | |
1109 | */ | |
1110 | for (i = 0; i < urb->number_of_packets; i++) { | |
1111 | struct ehci_iso_packet *uframe = &iso_sched->packet [i]; | |
1112 | unsigned length; | |
1113 | dma_addr_t buf; | |
1114 | u32 trans; | |
1115 | ||
1116 | length = urb->iso_frame_desc [i].length; | |
1117 | buf = dma + urb->iso_frame_desc [i].offset; | |
1118 | ||
1119 | trans = EHCI_ISOC_ACTIVE; | |
1120 | trans |= buf & 0x0fff; | |
1121 | if (unlikely (((i + 1) == urb->number_of_packets)) | |
1122 | && !(urb->transfer_flags & URB_NO_INTERRUPT)) | |
1123 | trans |= EHCI_ITD_IOC; | |
1124 | trans |= length << 16; | |
6dbd682b | 1125 | uframe->transaction = cpu_to_hc32(ehci, trans); |
1da177e4 | 1126 | |
77078570 | 1127 | /* might need to cross a buffer page within a uframe */ |
1da177e4 LT |
1128 | uframe->bufp = (buf & ~(u64)0x0fff); |
1129 | buf += length; | |
1130 | if (unlikely ((uframe->bufp != (buf & ~(u64)0x0fff)))) | |
1131 | uframe->cross = 1; | |
1132 | } | |
1133 | } | |
1134 | ||
1135 | static void | |
1136 | iso_sched_free ( | |
1137 | struct ehci_iso_stream *stream, | |
1138 | struct ehci_iso_sched *iso_sched | |
1139 | ) | |
1140 | { | |
1141 | if (!iso_sched) | |
1142 | return; | |
1143 | // caller must hold ehci->lock! | |
1144 | list_splice (&iso_sched->td_list, &stream->free_list); | |
1145 | kfree (iso_sched); | |
1146 | } | |
1147 | ||
1148 | static int | |
1149 | itd_urb_transaction ( | |
1150 | struct ehci_iso_stream *stream, | |
1151 | struct ehci_hcd *ehci, | |
1152 | struct urb *urb, | |
55016f10 | 1153 | gfp_t mem_flags |
1da177e4 LT |
1154 | ) |
1155 | { | |
1156 | struct ehci_itd *itd; | |
1157 | dma_addr_t itd_dma; | |
1158 | int i; | |
1159 | unsigned num_itds; | |
1160 | struct ehci_iso_sched *sched; | |
1161 | unsigned long flags; | |
1162 | ||
1163 | sched = iso_sched_alloc (urb->number_of_packets, mem_flags); | |
1164 | if (unlikely (sched == NULL)) | |
1165 | return -ENOMEM; | |
1166 | ||
6dbd682b | 1167 | itd_sched_init(ehci, sched, stream, urb); |
1da177e4 LT |
1168 | |
1169 | if (urb->interval < 8) | |
1170 | num_itds = 1 + (sched->span + 7) / 8; | |
1171 | else | |
1172 | num_itds = urb->number_of_packets; | |
1173 | ||
1174 | /* allocate/init ITDs */ | |
1175 | spin_lock_irqsave (&ehci->lock, flags); | |
1176 | for (i = 0; i < num_itds; i++) { | |
1177 | ||
1178 | /* free_list.next might be cache-hot ... but maybe | |
1179 | * the HC caches it too. avoid that issue for now. | |
1180 | */ | |
1181 | ||
1182 | /* prefer previously-allocated itds */ | |
1183 | if (likely (!list_empty(&stream->free_list))) { | |
1184 | itd = list_entry (stream->free_list.prev, | |
6dbd682b | 1185 | struct ehci_itd, itd_list); |
1da177e4 LT |
1186 | list_del (&itd->itd_list); |
1187 | itd_dma = itd->itd_dma; | |
3d01f0fe | 1188 | } else { |
1da177e4 LT |
1189 | spin_unlock_irqrestore (&ehci->lock, flags); |
1190 | itd = dma_pool_alloc (ehci->itd_pool, mem_flags, | |
1191 | &itd_dma); | |
1192 | spin_lock_irqsave (&ehci->lock, flags); | |
3d01f0fe KW |
1193 | if (!itd) { |
1194 | iso_sched_free(stream, sched); | |
1195 | spin_unlock_irqrestore(&ehci->lock, flags); | |
1196 | return -ENOMEM; | |
1197 | } | |
1da177e4 LT |
1198 | } |
1199 | ||
1da177e4 LT |
1200 | memset (itd, 0, sizeof *itd); |
1201 | itd->itd_dma = itd_dma; | |
1202 | list_add (&itd->itd_list, &sched->td_list); | |
1203 | } | |
1204 | spin_unlock_irqrestore (&ehci->lock, flags); | |
1205 | ||
1206 | /* temporarily store schedule info in hcpriv */ | |
1207 | urb->hcpriv = sched; | |
1208 | urb->error_count = 0; | |
1209 | return 0; | |
1210 | } | |
1211 | ||
1212 | /*-------------------------------------------------------------------------*/ | |
1213 | ||
1214 | static inline int | |
1215 | itd_slot_ok ( | |
1216 | struct ehci_hcd *ehci, | |
1217 | u32 mod, | |
1218 | u32 uframe, | |
1219 | u8 usecs, | |
1220 | u32 period | |
1221 | ) | |
1222 | { | |
1223 | uframe %= period; | |
1224 | do { | |
1225 | /* can't commit more than 80% periodic == 100 usec */ | |
1226 | if (periodic_usecs (ehci, uframe >> 3, uframe & 0x7) | |
1227 | > (100 - usecs)) | |
1228 | return 0; | |
1229 | ||
1230 | /* we know urb->interval is 2^N uframes */ | |
1231 | uframe += period; | |
1232 | } while (uframe < mod); | |
1233 | return 1; | |
1234 | } | |
1235 | ||
1236 | static inline int | |
1237 | sitd_slot_ok ( | |
1238 | struct ehci_hcd *ehci, | |
1239 | u32 mod, | |
1240 | struct ehci_iso_stream *stream, | |
1241 | u32 uframe, | |
1242 | struct ehci_iso_sched *sched, | |
1243 | u32 period_uframes | |
1244 | ) | |
1245 | { | |
1246 | u32 mask, tmp; | |
1247 | u32 frame, uf; | |
1248 | ||
1249 | mask = stream->raw_mask << (uframe & 7); | |
1250 | ||
1251 | /* for IN, don't wrap CSPLIT into the next frame */ | |
1252 | if (mask & ~0xffff) | |
1253 | return 0; | |
1254 | ||
1255 | /* this multi-pass logic is simple, but performance may | |
1256 | * suffer when the schedule data isn't cached. | |
1257 | */ | |
1258 | ||
1259 | /* check bandwidth */ | |
1260 | uframe %= period_uframes; | |
1261 | do { | |
1262 | u32 max_used; | |
1263 | ||
1264 | frame = uframe >> 3; | |
1265 | uf = uframe & 7; | |
1266 | ||
ba47f66b DS |
1267 | #ifdef CONFIG_USB_EHCI_TT_NEWSCHED |
1268 | /* The tt's fullspeed bus bandwidth must be available. | |
1269 | * tt_available scheduling guarantees 10+% for control/bulk. | |
1270 | */ | |
1271 | if (!tt_available (ehci, period_uframes << 3, | |
1272 | stream->udev, frame, uf, stream->tt_usecs)) | |
1273 | return 0; | |
1274 | #else | |
1da177e4 LT |
1275 | /* tt must be idle for start(s), any gap, and csplit. |
1276 | * assume scheduling slop leaves 10+% for control/bulk. | |
1277 | */ | |
1278 | if (!tt_no_collision (ehci, period_uframes << 3, | |
1279 | stream->udev, frame, mask)) | |
1280 | return 0; | |
ba47f66b | 1281 | #endif |
1da177e4 LT |
1282 | |
1283 | /* check starts (OUT uses more than one) */ | |
1284 | max_used = 100 - stream->usecs; | |
1285 | for (tmp = stream->raw_mask & 0xff; tmp; tmp >>= 1, uf++) { | |
1286 | if (periodic_usecs (ehci, frame, uf) > max_used) | |
1287 | return 0; | |
1288 | } | |
1289 | ||
1290 | /* for IN, check CSPLIT */ | |
1291 | if (stream->c_usecs) { | |
0c734622 | 1292 | uf = uframe & 7; |
1da177e4 LT |
1293 | max_used = 100 - stream->c_usecs; |
1294 | do { | |
1295 | tmp = 1 << uf; | |
1296 | tmp <<= 8; | |
1297 | if ((stream->raw_mask & tmp) == 0) | |
1298 | continue; | |
1299 | if (periodic_usecs (ehci, frame, uf) | |
1300 | > max_used) | |
1301 | return 0; | |
1302 | } while (++uf < 8); | |
1303 | } | |
1304 | ||
1305 | /* we know urb->interval is 2^N uframes */ | |
1306 | uframe += period_uframes; | |
1307 | } while (uframe < mod); | |
1308 | ||
6dbd682b | 1309 | stream->splits = cpu_to_hc32(ehci, stream->raw_mask << (uframe & 7)); |
1da177e4 LT |
1310 | return 1; |
1311 | } | |
1312 | ||
1313 | /* | |
1314 | * This scheduler plans almost as far into the future as it has actual | |
1315 | * periodic schedule slots. (Affected by TUNE_FLS, which defaults to | |
1316 | * "as small as possible" to be cache-friendlier.) That limits the size | |
1317 | * transfers you can stream reliably; avoid more than 64 msec per urb. | |
1318 | * Also avoid queue depths of less than ehci's worst irq latency (affected | |
1319 | * by the per-urb URB_NO_INTERRUPT hint, the log2_irq_thresh module parameter, | |
1320 | * and other factors); or more than about 230 msec total (for portability, | |
1321 | * given EHCI_TUNE_FLS and the slop). Or, write a smarter scheduler! | |
1322 | */ | |
1323 | ||
1324 | #define SCHEDULE_SLOP 10 /* frames */ | |
1325 | ||
1326 | static int | |
1327 | iso_stream_schedule ( | |
1328 | struct ehci_hcd *ehci, | |
1329 | struct urb *urb, | |
1330 | struct ehci_iso_stream *stream | |
1331 | ) | |
1332 | { | |
1333 | u32 now, start, max, period; | |
1334 | int status; | |
1335 | unsigned mod = ehci->periodic_size << 3; | |
1336 | struct ehci_iso_sched *sched = urb->hcpriv; | |
1337 | ||
1338 | if (sched->span > (mod - 8 * SCHEDULE_SLOP)) { | |
1339 | ehci_dbg (ehci, "iso request %p too long\n", urb); | |
1340 | status = -EFBIG; | |
1341 | goto fail; | |
1342 | } | |
1343 | ||
1344 | if ((stream->depth + sched->span) > mod) { | |
1345 | ehci_dbg (ehci, "request %p would overflow (%d+%d>%d)\n", | |
1346 | urb, stream->depth, sched->span, mod); | |
1347 | status = -EFBIG; | |
1348 | goto fail; | |
1349 | } | |
1350 | ||
083522d7 | 1351 | now = ehci_readl(ehci, &ehci->regs->frame_index) % mod; |
1da177e4 LT |
1352 | |
1353 | /* when's the last uframe this urb could start? */ | |
1354 | max = now + mod; | |
1355 | ||
b40e43fc AS |
1356 | /* Typical case: reuse current schedule, stream is still active. |
1357 | * Hopefully there are no gaps from the host falling behind | |
1358 | * (irq delays etc), but if there are we'll take the next | |
1359 | * slot in the schedule, implicitly assuming URB_ISO_ASAP. | |
1da177e4 LT |
1360 | */ |
1361 | if (likely (!list_empty (&stream->td_list))) { | |
1362 | start = stream->next_uframe; | |
1363 | if (start < now) | |
1364 | start += mod; | |
b40e43fc AS |
1365 | |
1366 | /* Fell behind (by up to twice the slop amount)? */ | |
1367 | if (start >= max - 2 * 8 * SCHEDULE_SLOP) | |
1368 | start += stream->interval * DIV_ROUND_UP( | |
1369 | max - start, stream->interval) - mod; | |
1370 | ||
1371 | /* Tried to schedule too far into the future? */ | |
1372 | if (unlikely((start + sched->span) >= max)) { | |
1373 | status = -EFBIG; | |
1374 | goto fail; | |
1375 | } | |
1376 | goto ready; | |
1da177e4 LT |
1377 | } |
1378 | ||
1379 | /* need to schedule; when's the next (u)frame we could start? | |
1380 | * this is bigger than ehci->i_thresh allows; scheduling itself | |
1381 | * isn't free, the slop should handle reasonably slow cpus. it | |
1382 | * can also help high bandwidth if the dma and irq loads don't | |
1383 | * jump until after the queue is primed. | |
1384 | */ | |
1385 | start = SCHEDULE_SLOP * 8 + (now & ~0x07); | |
1386 | start %= mod; | |
1387 | stream->next_uframe = start; | |
1388 | ||
1389 | /* NOTE: assumes URB_ISO_ASAP, to limit complexity/bugs */ | |
1390 | ||
1391 | period = urb->interval; | |
1392 | if (!stream->highspeed) | |
1393 | period <<= 3; | |
1394 | ||
1395 | /* find a uframe slot with enough bandwidth */ | |
1396 | for (; start < (stream->next_uframe + period); start++) { | |
1397 | int enough_space; | |
1398 | ||
1399 | /* check schedule: enough space? */ | |
1400 | if (stream->highspeed) | |
1401 | enough_space = itd_slot_ok (ehci, mod, start, | |
1402 | stream->usecs, period); | |
1403 | else { | |
1404 | if ((start % 8) >= 6) | |
1405 | continue; | |
1406 | enough_space = sitd_slot_ok (ehci, mod, stream, | |
1407 | start, sched, period); | |
1408 | } | |
1409 | ||
1410 | /* schedule it here if there's enough bandwidth */ | |
1411 | if (enough_space) { | |
1412 | stream->next_uframe = start % mod; | |
1413 | goto ready; | |
1414 | } | |
1415 | } | |
1416 | ||
1417 | /* no room in the schedule */ | |
1418 | ehci_dbg (ehci, "iso %ssched full %p (now %d max %d)\n", | |
1419 | list_empty (&stream->td_list) ? "" : "re", | |
1420 | urb, now, max); | |
1421 | status = -ENOSPC; | |
1422 | ||
1423 | fail: | |
1424 | iso_sched_free (stream, sched); | |
1425 | urb->hcpriv = NULL; | |
1426 | return status; | |
1427 | ||
1428 | ready: | |
1429 | /* report high speed start in uframes; full speed, in frames */ | |
1430 | urb->start_frame = stream->next_uframe; | |
1431 | if (!stream->highspeed) | |
1432 | urb->start_frame >>= 3; | |
1433 | return 0; | |
1434 | } | |
1435 | ||
1436 | /*-------------------------------------------------------------------------*/ | |
1437 | ||
1438 | static inline void | |
6dbd682b SR |
1439 | itd_init(struct ehci_hcd *ehci, struct ehci_iso_stream *stream, |
1440 | struct ehci_itd *itd) | |
1da177e4 LT |
1441 | { |
1442 | int i; | |
1443 | ||
77078570 | 1444 | /* it's been recently zeroed */ |
6dbd682b | 1445 | itd->hw_next = EHCI_LIST_END(ehci); |
1da177e4 LT |
1446 | itd->hw_bufp [0] = stream->buf0; |
1447 | itd->hw_bufp [1] = stream->buf1; | |
1448 | itd->hw_bufp [2] = stream->buf2; | |
1449 | ||
1450 | for (i = 0; i < 8; i++) | |
1451 | itd->index[i] = -1; | |
1452 | ||
1453 | /* All other fields are filled when scheduling */ | |
1454 | } | |
1455 | ||
1456 | static inline void | |
6dbd682b SR |
1457 | itd_patch( |
1458 | struct ehci_hcd *ehci, | |
1da177e4 LT |
1459 | struct ehci_itd *itd, |
1460 | struct ehci_iso_sched *iso_sched, | |
1461 | unsigned index, | |
77078570 | 1462 | u16 uframe |
1da177e4 LT |
1463 | ) |
1464 | { | |
1465 | struct ehci_iso_packet *uf = &iso_sched->packet [index]; | |
1466 | unsigned pg = itd->pg; | |
1467 | ||
1468 | // BUG_ON (pg == 6 && uf->cross); | |
1469 | ||
1470 | uframe &= 0x07; | |
1471 | itd->index [uframe] = index; | |
1472 | ||
6dbd682b SR |
1473 | itd->hw_transaction[uframe] = uf->transaction; |
1474 | itd->hw_transaction[uframe] |= cpu_to_hc32(ehci, pg << 12); | |
1475 | itd->hw_bufp[pg] |= cpu_to_hc32(ehci, uf->bufp & ~(u32)0); | |
1476 | itd->hw_bufp_hi[pg] |= cpu_to_hc32(ehci, (u32)(uf->bufp >> 32)); | |
1da177e4 LT |
1477 | |
1478 | /* iso_frame_desc[].offset must be strictly increasing */ | |
77078570 | 1479 | if (unlikely (uf->cross)) { |
1da177e4 | 1480 | u64 bufp = uf->bufp + 4096; |
6dbd682b | 1481 | |
1da177e4 | 1482 | itd->pg = ++pg; |
6dbd682b SR |
1483 | itd->hw_bufp[pg] |= cpu_to_hc32(ehci, bufp & ~(u32)0); |
1484 | itd->hw_bufp_hi[pg] |= cpu_to_hc32(ehci, (u32)(bufp >> 32)); | |
1da177e4 LT |
1485 | } |
1486 | } | |
1487 | ||
1488 | static inline void | |
1489 | itd_link (struct ehci_hcd *ehci, unsigned frame, struct ehci_itd *itd) | |
1490 | { | |
1491 | /* always prepend ITD/SITD ... only QH tree is order-sensitive */ | |
1492 | itd->itd_next = ehci->pshadow [frame]; | |
1493 | itd->hw_next = ehci->periodic [frame]; | |
1494 | ehci->pshadow [frame].itd = itd; | |
1495 | itd->frame = frame; | |
1496 | wmb (); | |
6dbd682b | 1497 | ehci->periodic[frame] = cpu_to_hc32(ehci, itd->itd_dma | Q_TYPE_ITD); |
1da177e4 LT |
1498 | } |
1499 | ||
1500 | /* fit urb's itds into the selected schedule slot; activate as needed */ | |
1501 | static int | |
1502 | itd_link_urb ( | |
1503 | struct ehci_hcd *ehci, | |
1504 | struct urb *urb, | |
1505 | unsigned mod, | |
1506 | struct ehci_iso_stream *stream | |
1507 | ) | |
1508 | { | |
77078570 | 1509 | int packet; |
1da177e4 LT |
1510 | unsigned next_uframe, uframe, frame; |
1511 | struct ehci_iso_sched *iso_sched = urb->hcpriv; | |
1512 | struct ehci_itd *itd; | |
1513 | ||
1514 | next_uframe = stream->next_uframe % mod; | |
1515 | ||
1516 | if (unlikely (list_empty(&stream->td_list))) { | |
1517 | ehci_to_hcd(ehci)->self.bandwidth_allocated | |
1518 | += stream->bandwidth; | |
1519 | ehci_vdbg (ehci, | |
1520 | "schedule devp %s ep%d%s-iso period %d start %d.%d\n", | |
1521 | urb->dev->devpath, stream->bEndpointAddress & 0x0f, | |
1522 | (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out", | |
1523 | urb->interval, | |
1524 | next_uframe >> 3, next_uframe & 0x7); | |
1525 | stream->start = jiffies; | |
1526 | } | |
1527 | ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs++; | |
1528 | ||
1529 | /* fill iTDs uframe by uframe */ | |
1530 | for (packet = 0, itd = NULL; packet < urb->number_of_packets; ) { | |
1531 | if (itd == NULL) { | |
1532 | /* ASSERT: we have all necessary itds */ | |
1533 | // BUG_ON (list_empty (&iso_sched->td_list)); | |
1534 | ||
1535 | /* ASSERT: no itds for this endpoint in this uframe */ | |
1536 | ||
1537 | itd = list_entry (iso_sched->td_list.next, | |
1538 | struct ehci_itd, itd_list); | |
1539 | list_move_tail (&itd->itd_list, &stream->td_list); | |
1540 | itd->stream = iso_stream_get (stream); | |
508db8c9 | 1541 | itd->urb = urb; |
6dbd682b | 1542 | itd_init (ehci, stream, itd); |
1da177e4 LT |
1543 | } |
1544 | ||
1545 | uframe = next_uframe & 0x07; | |
1546 | frame = next_uframe >> 3; | |
1547 | ||
6dbd682b | 1548 | itd_patch(ehci, itd, iso_sched, packet, uframe); |
1da177e4 LT |
1549 | |
1550 | next_uframe += stream->interval; | |
1551 | stream->depth += stream->interval; | |
1552 | next_uframe %= mod; | |
1553 | packet++; | |
1554 | ||
1555 | /* link completed itds into the schedule */ | |
1556 | if (((next_uframe >> 3) != frame) | |
1557 | || packet == urb->number_of_packets) { | |
1558 | itd_link (ehci, frame % ehci->periodic_size, itd); | |
1559 | itd = NULL; | |
1560 | } | |
1561 | } | |
1562 | stream->next_uframe = next_uframe; | |
1563 | ||
1564 | /* don't need that schedule data any more */ | |
1565 | iso_sched_free (stream, iso_sched); | |
1566 | urb->hcpriv = NULL; | |
1567 | ||
1568 | timer_action (ehci, TIMER_IO_WATCHDOG); | |
01c17142 | 1569 | return enable_periodic(ehci); |
1da177e4 LT |
1570 | } |
1571 | ||
1572 | #define ISO_ERRS (EHCI_ISOC_BUF_ERR | EHCI_ISOC_BABBLE | EHCI_ISOC_XACTERR) | |
1573 | ||
30bf54e6 DB |
1574 | /* Process and recycle a completed ITD. Return true iff its urb completed, |
1575 | * and hence its completion callback probably added things to the hardware | |
1576 | * schedule. | |
1577 | * | |
1578 | * Note that we carefully avoid recycling this descriptor until after any | |
1579 | * completion callback runs, so that it won't be reused quickly. That is, | |
1580 | * assuming (a) no more than two urbs per frame on this endpoint, and also | |
1581 | * (b) only this endpoint's completions submit URBs. It seems some silicon | |
1582 | * corrupts things if you reuse completed descriptors very quickly... | |
1583 | */ | |
1da177e4 LT |
1584 | static unsigned |
1585 | itd_complete ( | |
1586 | struct ehci_hcd *ehci, | |
7d12e780 | 1587 | struct ehci_itd *itd |
1da177e4 LT |
1588 | ) { |
1589 | struct urb *urb = itd->urb; | |
1590 | struct usb_iso_packet_descriptor *desc; | |
1591 | u32 t; | |
1592 | unsigned uframe; | |
1593 | int urb_index = -1; | |
1594 | struct ehci_iso_stream *stream = itd->stream; | |
1595 | struct usb_device *dev; | |
30bf54e6 | 1596 | unsigned retval = false; |
1da177e4 LT |
1597 | |
1598 | /* for each uframe with a packet */ | |
1599 | for (uframe = 0; uframe < 8; uframe++) { | |
1600 | if (likely (itd->index[uframe] == -1)) | |
1601 | continue; | |
1602 | urb_index = itd->index[uframe]; | |
1603 | desc = &urb->iso_frame_desc [urb_index]; | |
1604 | ||
6dbd682b | 1605 | t = hc32_to_cpup(ehci, &itd->hw_transaction [uframe]); |
1da177e4 LT |
1606 | itd->hw_transaction [uframe] = 0; |
1607 | stream->depth -= stream->interval; | |
1608 | ||
1609 | /* report transfer status */ | |
1610 | if (unlikely (t & ISO_ERRS)) { | |
1611 | urb->error_count++; | |
1612 | if (t & EHCI_ISOC_BUF_ERR) | |
1613 | desc->status = usb_pipein (urb->pipe) | |
1614 | ? -ENOSR /* hc couldn't read */ | |
1615 | : -ECOMM; /* hc couldn't write */ | |
1616 | else if (t & EHCI_ISOC_BABBLE) | |
1617 | desc->status = -EOVERFLOW; | |
1618 | else /* (t & EHCI_ISOC_XACTERR) */ | |
1619 | desc->status = -EPROTO; | |
1620 | ||
1621 | /* HC need not update length with this error */ | |
1622 | if (!(t & EHCI_ISOC_BABBLE)) | |
1623 | desc->actual_length = EHCI_ITD_LENGTH (t); | |
1624 | } else if (likely ((t & EHCI_ISOC_ACTIVE) == 0)) { | |
1625 | desc->status = 0; | |
1626 | desc->actual_length = EHCI_ITD_LENGTH (t); | |
b40e43fc AS |
1627 | } else { |
1628 | /* URB was too late */ | |
1629 | desc->status = -EXDEV; | |
1da177e4 LT |
1630 | } |
1631 | } | |
1632 | ||
1da177e4 LT |
1633 | /* handle completion now? */ |
1634 | if (likely ((urb_index + 1) != urb->number_of_packets)) | |
30bf54e6 | 1635 | goto done; |
1da177e4 LT |
1636 | |
1637 | /* ASSERT: it's really the last itd for this urb | |
1638 | list_for_each_entry (itd, &stream->td_list, itd_list) | |
1639 | BUG_ON (itd->urb == urb); | |
1640 | */ | |
1641 | ||
aa16ca30 | 1642 | /* give urb back to the driver; completion often (re)submits */ |
6a8e87b2 | 1643 | dev = urb->dev; |
14c04c0f | 1644 | ehci_urb_done(ehci, urb, 0); |
30bf54e6 | 1645 | retval = true; |
1da177e4 | 1646 | urb = NULL; |
01c17142 | 1647 | (void) disable_periodic(ehci); |
1da177e4 LT |
1648 | ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs--; |
1649 | ||
508db8c9 | 1650 | if (unlikely(list_is_singular(&stream->td_list))) { |
1da177e4 LT |
1651 | ehci_to_hcd(ehci)->self.bandwidth_allocated |
1652 | -= stream->bandwidth; | |
1653 | ehci_vdbg (ehci, | |
1654 | "deschedule devp %s ep%d%s-iso\n", | |
1655 | dev->devpath, stream->bEndpointAddress & 0x0f, | |
1656 | (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out"); | |
1657 | } | |
1658 | iso_stream_put (ehci, stream); | |
9aa09d2f | 1659 | |
30bf54e6 | 1660 | done: |
30bf54e6 | 1661 | itd->urb = NULL; |
9aa09d2f KW |
1662 | if (ehci->clock_frame != itd->frame || itd->index[7] != -1) { |
1663 | /* OK to recycle this ITD now. */ | |
1664 | itd->stream = NULL; | |
1665 | list_move(&itd->itd_list, &stream->free_list); | |
1666 | iso_stream_put(ehci, stream); | |
1667 | } else { | |
1668 | /* HW might remember this ITD, so we can't recycle it yet. | |
1669 | * Move it to a safe place until a new frame starts. | |
1670 | */ | |
1671 | list_move(&itd->itd_list, &ehci->cached_itd_list); | |
1672 | if (stream->refcount == 2) { | |
1673 | /* If iso_stream_put() were called here, stream | |
1674 | * would be freed. Instead, just prevent reuse. | |
1675 | */ | |
1676 | stream->ep->hcpriv = NULL; | |
1677 | stream->ep = NULL; | |
1678 | } | |
1679 | } | |
30bf54e6 | 1680 | return retval; |
1da177e4 LT |
1681 | } |
1682 | ||
1683 | /*-------------------------------------------------------------------------*/ | |
1684 | ||
5db539e4 | 1685 | static int itd_submit (struct ehci_hcd *ehci, struct urb *urb, |
55016f10 | 1686 | gfp_t mem_flags) |
1da177e4 LT |
1687 | { |
1688 | int status = -EINVAL; | |
1689 | unsigned long flags; | |
1690 | struct ehci_iso_stream *stream; | |
1691 | ||
1692 | /* Get iso_stream head */ | |
1693 | stream = iso_stream_find (ehci, urb); | |
1694 | if (unlikely (stream == NULL)) { | |
1695 | ehci_dbg (ehci, "can't get iso stream\n"); | |
1696 | return -ENOMEM; | |
1697 | } | |
1698 | if (unlikely (urb->interval != stream->interval)) { | |
1699 | ehci_dbg (ehci, "can't change iso interval %d --> %d\n", | |
1700 | stream->interval, urb->interval); | |
1701 | goto done; | |
1702 | } | |
1703 | ||
1704 | #ifdef EHCI_URB_TRACE | |
1705 | ehci_dbg (ehci, | |
1706 | "%s %s urb %p ep%d%s len %d, %d pkts %d uframes [%p]\n", | |
441b62c1 | 1707 | __func__, urb->dev->devpath, urb, |
1da177e4 LT |
1708 | usb_pipeendpoint (urb->pipe), |
1709 | usb_pipein (urb->pipe) ? "in" : "out", | |
1710 | urb->transfer_buffer_length, | |
1711 | urb->number_of_packets, urb->interval, | |
1712 | stream); | |
1713 | #endif | |
1714 | ||
1715 | /* allocate ITDs w/o locking anything */ | |
1716 | status = itd_urb_transaction (stream, ehci, urb, mem_flags); | |
1717 | if (unlikely (status < 0)) { | |
1718 | ehci_dbg (ehci, "can't init itds\n"); | |
1719 | goto done; | |
1720 | } | |
1721 | ||
1722 | /* schedule ... need to lock */ | |
1723 | spin_lock_irqsave (&ehci->lock, flags); | |
8de98402 | 1724 | if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, |
e9df41c5 | 1725 | &ehci_to_hcd(ehci)->flags))) { |
8de98402 | 1726 | status = -ESHUTDOWN; |
e9df41c5 AS |
1727 | goto done_not_linked; |
1728 | } | |
1729 | status = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb); | |
1730 | if (unlikely(status)) | |
1731 | goto done_not_linked; | |
1732 | status = iso_stream_schedule(ehci, urb, stream); | |
53bd6a60 | 1733 | if (likely (status == 0)) |
1da177e4 | 1734 | itd_link_urb (ehci, urb, ehci->periodic_size << 3, stream); |
e9df41c5 AS |
1735 | else |
1736 | usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb); | |
1737 | done_not_linked: | |
1da177e4 LT |
1738 | spin_unlock_irqrestore (&ehci->lock, flags); |
1739 | ||
1740 | done: | |
1741 | if (unlikely (status < 0)) | |
1742 | iso_stream_put (ehci, stream); | |
1743 | return status; | |
1744 | } | |
1745 | ||
1da177e4 LT |
1746 | /*-------------------------------------------------------------------------*/ |
1747 | ||
1748 | /* | |
1749 | * "Split ISO TDs" ... used for USB 1.1 devices going through the | |
1750 | * TTs in USB 2.0 hubs. These need microframe scheduling. | |
1751 | */ | |
1752 | ||
1753 | static inline void | |
6dbd682b SR |
1754 | sitd_sched_init( |
1755 | struct ehci_hcd *ehci, | |
1da177e4 LT |
1756 | struct ehci_iso_sched *iso_sched, |
1757 | struct ehci_iso_stream *stream, | |
1758 | struct urb *urb | |
1759 | ) | |
1760 | { | |
1761 | unsigned i; | |
1762 | dma_addr_t dma = urb->transfer_dma; | |
1763 | ||
1764 | /* how many frames are needed for these transfers */ | |
1765 | iso_sched->span = urb->number_of_packets * stream->interval; | |
1766 | ||
1767 | /* figure out per-frame sitd fields that we'll need later | |
1768 | * when we fit new sitds into the schedule. | |
1769 | */ | |
1770 | for (i = 0; i < urb->number_of_packets; i++) { | |
1771 | struct ehci_iso_packet *packet = &iso_sched->packet [i]; | |
1772 | unsigned length; | |
1773 | dma_addr_t buf; | |
1774 | u32 trans; | |
1775 | ||
1776 | length = urb->iso_frame_desc [i].length & 0x03ff; | |
1777 | buf = dma + urb->iso_frame_desc [i].offset; | |
1778 | ||
1779 | trans = SITD_STS_ACTIVE; | |
1780 | if (((i + 1) == urb->number_of_packets) | |
1781 | && !(urb->transfer_flags & URB_NO_INTERRUPT)) | |
1782 | trans |= SITD_IOC; | |
1783 | trans |= length << 16; | |
6dbd682b | 1784 | packet->transaction = cpu_to_hc32(ehci, trans); |
1da177e4 LT |
1785 | |
1786 | /* might need to cross a buffer page within a td */ | |
1787 | packet->bufp = buf; | |
1788 | packet->buf1 = (buf + length) & ~0x0fff; | |
1789 | if (packet->buf1 != (buf & ~(u64)0x0fff)) | |
1790 | packet->cross = 1; | |
1791 | ||
53bd6a60 | 1792 | /* OUT uses multiple start-splits */ |
1da177e4 LT |
1793 | if (stream->bEndpointAddress & USB_DIR_IN) |
1794 | continue; | |
1795 | length = (length + 187) / 188; | |
1796 | if (length > 1) /* BEGIN vs ALL */ | |
1797 | length |= 1 << 3; | |
1798 | packet->buf1 |= length; | |
1799 | } | |
1800 | } | |
1801 | ||
1802 | static int | |
1803 | sitd_urb_transaction ( | |
1804 | struct ehci_iso_stream *stream, | |
1805 | struct ehci_hcd *ehci, | |
1806 | struct urb *urb, | |
55016f10 | 1807 | gfp_t mem_flags |
1da177e4 LT |
1808 | ) |
1809 | { | |
1810 | struct ehci_sitd *sitd; | |
1811 | dma_addr_t sitd_dma; | |
1812 | int i; | |
1813 | struct ehci_iso_sched *iso_sched; | |
1814 | unsigned long flags; | |
1815 | ||
1816 | iso_sched = iso_sched_alloc (urb->number_of_packets, mem_flags); | |
1817 | if (iso_sched == NULL) | |
1818 | return -ENOMEM; | |
1819 | ||
6dbd682b | 1820 | sitd_sched_init(ehci, iso_sched, stream, urb); |
1da177e4 LT |
1821 | |
1822 | /* allocate/init sITDs */ | |
1823 | spin_lock_irqsave (&ehci->lock, flags); | |
1824 | for (i = 0; i < urb->number_of_packets; i++) { | |
1825 | ||
1826 | /* NOTE: for now, we don't try to handle wraparound cases | |
1827 | * for IN (using sitd->hw_backpointer, like a FSTN), which | |
1828 | * means we never need two sitds for full speed packets. | |
1829 | */ | |
1830 | ||
1831 | /* free_list.next might be cache-hot ... but maybe | |
1832 | * the HC caches it too. avoid that issue for now. | |
1833 | */ | |
1834 | ||
1835 | /* prefer previously-allocated sitds */ | |
1836 | if (!list_empty(&stream->free_list)) { | |
1837 | sitd = list_entry (stream->free_list.prev, | |
1838 | struct ehci_sitd, sitd_list); | |
1839 | list_del (&sitd->sitd_list); | |
1840 | sitd_dma = sitd->sitd_dma; | |
3d01f0fe | 1841 | } else { |
1da177e4 LT |
1842 | spin_unlock_irqrestore (&ehci->lock, flags); |
1843 | sitd = dma_pool_alloc (ehci->sitd_pool, mem_flags, | |
1844 | &sitd_dma); | |
1845 | spin_lock_irqsave (&ehci->lock, flags); | |
3d01f0fe KW |
1846 | if (!sitd) { |
1847 | iso_sched_free(stream, iso_sched); | |
1848 | spin_unlock_irqrestore(&ehci->lock, flags); | |
1849 | return -ENOMEM; | |
1850 | } | |
1da177e4 LT |
1851 | } |
1852 | ||
1da177e4 LT |
1853 | memset (sitd, 0, sizeof *sitd); |
1854 | sitd->sitd_dma = sitd_dma; | |
1855 | list_add (&sitd->sitd_list, &iso_sched->td_list); | |
1856 | } | |
1857 | ||
1858 | /* temporarily store schedule info in hcpriv */ | |
1859 | urb->hcpriv = iso_sched; | |
1860 | urb->error_count = 0; | |
1861 | ||
1862 | spin_unlock_irqrestore (&ehci->lock, flags); | |
1863 | return 0; | |
1864 | } | |
1865 | ||
1866 | /*-------------------------------------------------------------------------*/ | |
1867 | ||
1868 | static inline void | |
6dbd682b SR |
1869 | sitd_patch( |
1870 | struct ehci_hcd *ehci, | |
1da177e4 LT |
1871 | struct ehci_iso_stream *stream, |
1872 | struct ehci_sitd *sitd, | |
1873 | struct ehci_iso_sched *iso_sched, | |
1874 | unsigned index | |
1875 | ) | |
1876 | { | |
1877 | struct ehci_iso_packet *uf = &iso_sched->packet [index]; | |
1878 | u64 bufp = uf->bufp; | |
1879 | ||
6dbd682b | 1880 | sitd->hw_next = EHCI_LIST_END(ehci); |
1da177e4 LT |
1881 | sitd->hw_fullspeed_ep = stream->address; |
1882 | sitd->hw_uframe = stream->splits; | |
1883 | sitd->hw_results = uf->transaction; | |
6dbd682b | 1884 | sitd->hw_backpointer = EHCI_LIST_END(ehci); |
1da177e4 LT |
1885 | |
1886 | bufp = uf->bufp; | |
6dbd682b SR |
1887 | sitd->hw_buf[0] = cpu_to_hc32(ehci, bufp); |
1888 | sitd->hw_buf_hi[0] = cpu_to_hc32(ehci, bufp >> 32); | |
1da177e4 | 1889 | |
6dbd682b | 1890 | sitd->hw_buf[1] = cpu_to_hc32(ehci, uf->buf1); |
1da177e4 LT |
1891 | if (uf->cross) |
1892 | bufp += 4096; | |
6dbd682b | 1893 | sitd->hw_buf_hi[1] = cpu_to_hc32(ehci, bufp >> 32); |
1da177e4 LT |
1894 | sitd->index = index; |
1895 | } | |
1896 | ||
1897 | static inline void | |
1898 | sitd_link (struct ehci_hcd *ehci, unsigned frame, struct ehci_sitd *sitd) | |
1899 | { | |
1900 | /* note: sitd ordering could matter (CSPLIT then SSPLIT) */ | |
1901 | sitd->sitd_next = ehci->pshadow [frame]; | |
1902 | sitd->hw_next = ehci->periodic [frame]; | |
1903 | ehci->pshadow [frame].sitd = sitd; | |
1904 | sitd->frame = frame; | |
1905 | wmb (); | |
6dbd682b | 1906 | ehci->periodic[frame] = cpu_to_hc32(ehci, sitd->sitd_dma | Q_TYPE_SITD); |
1da177e4 LT |
1907 | } |
1908 | ||
1909 | /* fit urb's sitds into the selected schedule slot; activate as needed */ | |
1910 | static int | |
1911 | sitd_link_urb ( | |
1912 | struct ehci_hcd *ehci, | |
1913 | struct urb *urb, | |
1914 | unsigned mod, | |
1915 | struct ehci_iso_stream *stream | |
1916 | ) | |
1917 | { | |
1918 | int packet; | |
1919 | unsigned next_uframe; | |
1920 | struct ehci_iso_sched *sched = urb->hcpriv; | |
1921 | struct ehci_sitd *sitd; | |
1922 | ||
1923 | next_uframe = stream->next_uframe; | |
1924 | ||
1925 | if (list_empty(&stream->td_list)) { | |
1926 | /* usbfs ignores TT bandwidth */ | |
1927 | ehci_to_hcd(ehci)->self.bandwidth_allocated | |
1928 | += stream->bandwidth; | |
1929 | ehci_vdbg (ehci, | |
1930 | "sched devp %s ep%d%s-iso [%d] %dms/%04x\n", | |
1931 | urb->dev->devpath, stream->bEndpointAddress & 0x0f, | |
1932 | (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out", | |
1933 | (next_uframe >> 3) % ehci->periodic_size, | |
6dbd682b | 1934 | stream->interval, hc32_to_cpu(ehci, stream->splits)); |
1da177e4 LT |
1935 | stream->start = jiffies; |
1936 | } | |
1937 | ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs++; | |
1938 | ||
1939 | /* fill sITDs frame by frame */ | |
1940 | for (packet = 0, sitd = NULL; | |
1941 | packet < urb->number_of_packets; | |
1942 | packet++) { | |
1943 | ||
1944 | /* ASSERT: we have all necessary sitds */ | |
1945 | BUG_ON (list_empty (&sched->td_list)); | |
1946 | ||
1947 | /* ASSERT: no itds for this endpoint in this frame */ | |
1948 | ||
1949 | sitd = list_entry (sched->td_list.next, | |
1950 | struct ehci_sitd, sitd_list); | |
1951 | list_move_tail (&sitd->sitd_list, &stream->td_list); | |
1952 | sitd->stream = iso_stream_get (stream); | |
508db8c9 | 1953 | sitd->urb = urb; |
1da177e4 | 1954 | |
6dbd682b | 1955 | sitd_patch(ehci, stream, sitd, sched, packet); |
1da177e4 LT |
1956 | sitd_link (ehci, (next_uframe >> 3) % ehci->periodic_size, |
1957 | sitd); | |
1958 | ||
1959 | next_uframe += stream->interval << 3; | |
1960 | stream->depth += stream->interval << 3; | |
1961 | } | |
1962 | stream->next_uframe = next_uframe % mod; | |
1963 | ||
1964 | /* don't need that schedule data any more */ | |
1965 | iso_sched_free (stream, sched); | |
1966 | urb->hcpriv = NULL; | |
1967 | ||
1968 | timer_action (ehci, TIMER_IO_WATCHDOG); | |
01c17142 | 1969 | return enable_periodic(ehci); |
1da177e4 LT |
1970 | } |
1971 | ||
1972 | /*-------------------------------------------------------------------------*/ | |
1973 | ||
1974 | #define SITD_ERRS (SITD_STS_ERR | SITD_STS_DBE | SITD_STS_BABBLE \ | |
53bd6a60 | 1975 | | SITD_STS_XACT | SITD_STS_MMF) |
1da177e4 | 1976 | |
30bf54e6 DB |
1977 | /* Process and recycle a completed SITD. Return true iff its urb completed, |
1978 | * and hence its completion callback probably added things to the hardware | |
1979 | * schedule. | |
1980 | * | |
1981 | * Note that we carefully avoid recycling this descriptor until after any | |
1982 | * completion callback runs, so that it won't be reused quickly. That is, | |
1983 | * assuming (a) no more than two urbs per frame on this endpoint, and also | |
1984 | * (b) only this endpoint's completions submit URBs. It seems some silicon | |
1985 | * corrupts things if you reuse completed descriptors very quickly... | |
1986 | */ | |
1da177e4 LT |
1987 | static unsigned |
1988 | sitd_complete ( | |
1989 | struct ehci_hcd *ehci, | |
7d12e780 | 1990 | struct ehci_sitd *sitd |
1da177e4 LT |
1991 | ) { |
1992 | struct urb *urb = sitd->urb; | |
1993 | struct usb_iso_packet_descriptor *desc; | |
1994 | u32 t; | |
1995 | int urb_index = -1; | |
1996 | struct ehci_iso_stream *stream = sitd->stream; | |
1997 | struct usb_device *dev; | |
30bf54e6 | 1998 | unsigned retval = false; |
1da177e4 LT |
1999 | |
2000 | urb_index = sitd->index; | |
2001 | desc = &urb->iso_frame_desc [urb_index]; | |
6dbd682b | 2002 | t = hc32_to_cpup(ehci, &sitd->hw_results); |
1da177e4 LT |
2003 | |
2004 | /* report transfer status */ | |
2005 | if (t & SITD_ERRS) { | |
2006 | urb->error_count++; | |
2007 | if (t & SITD_STS_DBE) | |
2008 | desc->status = usb_pipein (urb->pipe) | |
2009 | ? -ENOSR /* hc couldn't read */ | |
2010 | : -ECOMM; /* hc couldn't write */ | |
2011 | else if (t & SITD_STS_BABBLE) | |
2012 | desc->status = -EOVERFLOW; | |
2013 | else /* XACT, MMF, etc */ | |
2014 | desc->status = -EPROTO; | |
2015 | } else { | |
2016 | desc->status = 0; | |
2017 | desc->actual_length = desc->length - SITD_LENGTH (t); | |
2018 | } | |
1da177e4 | 2019 | stream->depth -= stream->interval << 3; |
1da177e4 LT |
2020 | |
2021 | /* handle completion now? */ | |
2022 | if ((urb_index + 1) != urb->number_of_packets) | |
30bf54e6 | 2023 | goto done; |
1da177e4 LT |
2024 | |
2025 | /* ASSERT: it's really the last sitd for this urb | |
2026 | list_for_each_entry (sitd, &stream->td_list, sitd_list) | |
2027 | BUG_ON (sitd->urb == urb); | |
2028 | */ | |
2029 | ||
aa16ca30 | 2030 | /* give urb back to the driver; completion often (re)submits */ |
6a8e87b2 | 2031 | dev = urb->dev; |
14c04c0f | 2032 | ehci_urb_done(ehci, urb, 0); |
30bf54e6 | 2033 | retval = true; |
1da177e4 | 2034 | urb = NULL; |
01c17142 | 2035 | (void) disable_periodic(ehci); |
1da177e4 LT |
2036 | ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs--; |
2037 | ||
508db8c9 | 2038 | if (list_is_singular(&stream->td_list)) { |
1da177e4 LT |
2039 | ehci_to_hcd(ehci)->self.bandwidth_allocated |
2040 | -= stream->bandwidth; | |
2041 | ehci_vdbg (ehci, | |
2042 | "deschedule devp %s ep%d%s-iso\n", | |
2043 | dev->devpath, stream->bEndpointAddress & 0x0f, | |
2044 | (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out"); | |
2045 | } | |
2046 | iso_stream_put (ehci, stream); | |
30bf54e6 DB |
2047 | /* OK to recycle this SITD now that its completion callback ran. */ |
2048 | done: | |
30bf54e6 DB |
2049 | sitd->urb = NULL; |
2050 | sitd->stream = NULL; | |
2051 | list_move(&sitd->sitd_list, &stream->free_list); | |
2052 | iso_stream_put(ehci, stream); | |
1da177e4 | 2053 | |
30bf54e6 | 2054 | return retval; |
1da177e4 LT |
2055 | } |
2056 | ||
2057 | ||
5db539e4 | 2058 | static int sitd_submit (struct ehci_hcd *ehci, struct urb *urb, |
55016f10 | 2059 | gfp_t mem_flags) |
1da177e4 LT |
2060 | { |
2061 | int status = -EINVAL; | |
2062 | unsigned long flags; | |
2063 | struct ehci_iso_stream *stream; | |
2064 | ||
2065 | /* Get iso_stream head */ | |
2066 | stream = iso_stream_find (ehci, urb); | |
2067 | if (stream == NULL) { | |
2068 | ehci_dbg (ehci, "can't get iso stream\n"); | |
2069 | return -ENOMEM; | |
2070 | } | |
2071 | if (urb->interval != stream->interval) { | |
2072 | ehci_dbg (ehci, "can't change iso interval %d --> %d\n", | |
2073 | stream->interval, urb->interval); | |
2074 | goto done; | |
2075 | } | |
2076 | ||
2077 | #ifdef EHCI_URB_TRACE | |
2078 | ehci_dbg (ehci, | |
2079 | "submit %p dev%s ep%d%s-iso len %d\n", | |
2080 | urb, urb->dev->devpath, | |
2081 | usb_pipeendpoint (urb->pipe), | |
2082 | usb_pipein (urb->pipe) ? "in" : "out", | |
2083 | urb->transfer_buffer_length); | |
2084 | #endif | |
2085 | ||
2086 | /* allocate SITDs */ | |
2087 | status = sitd_urb_transaction (stream, ehci, urb, mem_flags); | |
2088 | if (status < 0) { | |
2089 | ehci_dbg (ehci, "can't init sitds\n"); | |
2090 | goto done; | |
2091 | } | |
2092 | ||
2093 | /* schedule ... need to lock */ | |
2094 | spin_lock_irqsave (&ehci->lock, flags); | |
8de98402 | 2095 | if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, |
e9df41c5 | 2096 | &ehci_to_hcd(ehci)->flags))) { |
8de98402 | 2097 | status = -ESHUTDOWN; |
e9df41c5 AS |
2098 | goto done_not_linked; |
2099 | } | |
2100 | status = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb); | |
2101 | if (unlikely(status)) | |
2102 | goto done_not_linked; | |
2103 | status = iso_stream_schedule(ehci, urb, stream); | |
53bd6a60 | 2104 | if (status == 0) |
1da177e4 | 2105 | sitd_link_urb (ehci, urb, ehci->periodic_size << 3, stream); |
e9df41c5 AS |
2106 | else |
2107 | usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb); | |
2108 | done_not_linked: | |
1da177e4 LT |
2109 | spin_unlock_irqrestore (&ehci->lock, flags); |
2110 | ||
2111 | done: | |
2112 | if (status < 0) | |
2113 | iso_stream_put (ehci, stream); | |
2114 | return status; | |
2115 | } | |
2116 | ||
1da177e4 LT |
2117 | /*-------------------------------------------------------------------------*/ |
2118 | ||
9aa09d2f KW |
2119 | static void free_cached_itd_list(struct ehci_hcd *ehci) |
2120 | { | |
2121 | struct ehci_itd *itd, *n; | |
2122 | ||
2123 | list_for_each_entry_safe(itd, n, &ehci->cached_itd_list, itd_list) { | |
2124 | struct ehci_iso_stream *stream = itd->stream; | |
2125 | itd->stream = NULL; | |
2126 | list_move(&itd->itd_list, &stream->free_list); | |
2127 | iso_stream_put(ehci, stream); | |
2128 | } | |
2129 | } | |
2130 | ||
2131 | /*-------------------------------------------------------------------------*/ | |
2132 | ||
1da177e4 | 2133 | static void |
7d12e780 | 2134 | scan_periodic (struct ehci_hcd *ehci) |
1da177e4 | 2135 | { |
b40e43fc | 2136 | unsigned now_uframe, frame, clock, clock_frame, mod; |
1da177e4 LT |
2137 | unsigned modified; |
2138 | ||
2139 | mod = ehci->periodic_size << 3; | |
2140 | ||
2141 | /* | |
2142 | * When running, scan from last scan point up to "now" | |
2143 | * else clean up by scanning everything that's left. | |
2144 | * Touches as few pages as possible: cache-friendly. | |
2145 | */ | |
2146 | now_uframe = ehci->next_uframe; | |
9aa09d2f | 2147 | if (HC_IS_RUNNING(ehci_to_hcd(ehci)->state)) { |
083522d7 | 2148 | clock = ehci_readl(ehci, &ehci->regs->frame_index); |
9aa09d2f KW |
2149 | clock_frame = (clock >> 3) % ehci->periodic_size; |
2150 | } else { | |
1da177e4 | 2151 | clock = now_uframe + mod - 1; |
9aa09d2f KW |
2152 | clock_frame = -1; |
2153 | } | |
2154 | if (ehci->clock_frame != clock_frame) { | |
2155 | free_cached_itd_list(ehci); | |
2156 | ehci->clock_frame = clock_frame; | |
2157 | } | |
1da177e4 | 2158 | clock %= mod; |
b40e43fc | 2159 | clock_frame = clock >> 3; |
1da177e4 LT |
2160 | |
2161 | for (;;) { | |
2162 | union ehci_shadow q, *q_p; | |
6dbd682b | 2163 | __hc32 type, *hw_p; |
79592b72 | 2164 | unsigned incomplete = false; |
1da177e4 | 2165 | |
1da177e4 | 2166 | frame = now_uframe >> 3; |
1da177e4 LT |
2167 | |
2168 | restart: | |
2169 | /* scan each element in frame's queue for completions */ | |
2170 | q_p = &ehci->pshadow [frame]; | |
2171 | hw_p = &ehci->periodic [frame]; | |
2172 | q.ptr = q_p->ptr; | |
6dbd682b | 2173 | type = Q_NEXT_TYPE(ehci, *hw_p); |
1da177e4 LT |
2174 | modified = 0; |
2175 | ||
2176 | while (q.ptr != NULL) { | |
2177 | unsigned uf; | |
2178 | union ehci_shadow temp; | |
2179 | int live; | |
2180 | ||
2181 | live = HC_IS_RUNNING (ehci_to_hcd(ehci)->state); | |
6dbd682b | 2182 | switch (hc32_to_cpu(ehci, type)) { |
1da177e4 LT |
2183 | case Q_TYPE_QH: |
2184 | /* handle any completions */ | |
2185 | temp.qh = qh_get (q.qh); | |
6dbd682b | 2186 | type = Q_NEXT_TYPE(ehci, q.qh->hw_next); |
1da177e4 | 2187 | q = q.qh->qh_next; |
7d12e780 | 2188 | modified = qh_completions (ehci, temp.qh); |
1da177e4 LT |
2189 | if (unlikely (list_empty (&temp.qh->qtd_list))) |
2190 | intr_deschedule (ehci, temp.qh); | |
2191 | qh_put (temp.qh); | |
2192 | break; | |
2193 | case Q_TYPE_FSTN: | |
2194 | /* for "save place" FSTNs, look at QH entries | |
2195 | * in the previous frame for completions. | |
2196 | */ | |
6dbd682b | 2197 | if (q.fstn->hw_prev != EHCI_LIST_END(ehci)) { |
1da177e4 LT |
2198 | dbg ("ignoring completions from FSTNs"); |
2199 | } | |
6dbd682b | 2200 | type = Q_NEXT_TYPE(ehci, q.fstn->hw_next); |
1da177e4 LT |
2201 | q = q.fstn->fstn_next; |
2202 | break; | |
2203 | case Q_TYPE_ITD: | |
79592b72 DB |
2204 | /* If this ITD is still active, leave it for |
2205 | * later processing ... check the next entry. | |
b40e43fc AS |
2206 | * No need to check for activity unless the |
2207 | * frame is current. | |
79592b72 | 2208 | */ |
b40e43fc AS |
2209 | if (frame == clock_frame && live) { |
2210 | rmb(); | |
2211 | for (uf = 0; uf < 8; uf++) { | |
2212 | if (q.itd->hw_transaction[uf] & | |
2213 | ITD_ACTIVE(ehci)) | |
2214 | break; | |
2215 | } | |
2216 | if (uf < 8) { | |
2217 | incomplete = true; | |
2218 | q_p = &q.itd->itd_next; | |
2219 | hw_p = &q.itd->hw_next; | |
2220 | type = Q_NEXT_TYPE(ehci, | |
6dbd682b | 2221 | q.itd->hw_next); |
b40e43fc AS |
2222 | q = *q_p; |
2223 | break; | |
2224 | } | |
1da177e4 | 2225 | } |
1da177e4 | 2226 | |
79592b72 DB |
2227 | /* Take finished ITDs out of the schedule |
2228 | * and process them: recycle, maybe report | |
2229 | * URB completion. HC won't cache the | |
1da177e4 LT |
2230 | * pointer for much longer, if at all. |
2231 | */ | |
2232 | *q_p = q.itd->itd_next; | |
2233 | *hw_p = q.itd->hw_next; | |
6dbd682b | 2234 | type = Q_NEXT_TYPE(ehci, q.itd->hw_next); |
1da177e4 | 2235 | wmb(); |
7d12e780 | 2236 | modified = itd_complete (ehci, q.itd); |
1da177e4 LT |
2237 | q = *q_p; |
2238 | break; | |
2239 | case Q_TYPE_SITD: | |
79592b72 DB |
2240 | /* If this SITD is still active, leave it for |
2241 | * later processing ... check the next entry. | |
b40e43fc AS |
2242 | * No need to check for activity unless the |
2243 | * frame is current. | |
79592b72 | 2244 | */ |
b40e43fc AS |
2245 | if (frame == clock_frame && live && |
2246 | (q.sitd->hw_results & | |
2247 | SITD_ACTIVE(ehci))) { | |
79592b72 | 2248 | incomplete = true; |
1da177e4 LT |
2249 | q_p = &q.sitd->sitd_next; |
2250 | hw_p = &q.sitd->hw_next; | |
6dbd682b SR |
2251 | type = Q_NEXT_TYPE(ehci, |
2252 | q.sitd->hw_next); | |
1da177e4 LT |
2253 | q = *q_p; |
2254 | break; | |
2255 | } | |
79592b72 DB |
2256 | |
2257 | /* Take finished SITDs out of the schedule | |
2258 | * and process them: recycle, maybe report | |
2259 | * URB completion. | |
2260 | */ | |
1da177e4 LT |
2261 | *q_p = q.sitd->sitd_next; |
2262 | *hw_p = q.sitd->hw_next; | |
6dbd682b | 2263 | type = Q_NEXT_TYPE(ehci, q.sitd->hw_next); |
1da177e4 | 2264 | wmb(); |
7d12e780 | 2265 | modified = sitd_complete (ehci, q.sitd); |
1da177e4 LT |
2266 | q = *q_p; |
2267 | break; | |
2268 | default: | |
2269 | dbg ("corrupt type %d frame %d shadow %p", | |
2270 | type, frame, q.ptr); | |
2271 | // BUG (); | |
2272 | q.ptr = NULL; | |
2273 | } | |
2274 | ||
2275 | /* assume completion callbacks modify the queue */ | |
aa16ca30 DB |
2276 | if (unlikely (modified)) { |
2277 | if (likely(ehci->periodic_sched > 0)) | |
2278 | goto restart; | |
01c17142 | 2279 | /* short-circuit this scan */ |
aa16ca30 DB |
2280 | now_uframe = clock; |
2281 | break; | |
2282 | } | |
1da177e4 LT |
2283 | } |
2284 | ||
79592b72 DB |
2285 | /* If we can tell we caught up to the hardware, stop now. |
2286 | * We can't advance our scan without collecting the ISO | |
2287 | * transfers that are still pending in this frame. | |
2288 | */ | |
2289 | if (incomplete && HC_IS_RUNNING(ehci_to_hcd(ehci)->state)) { | |
2290 | ehci->next_uframe = now_uframe; | |
2291 | break; | |
2292 | } | |
1da177e4 LT |
2293 | |
2294 | // FIXME: this assumes we won't get lapped when | |
2295 | // latencies climb; that should be rare, but... | |
2296 | // detect it, and just go all the way around. | |
2297 | // FLR might help detect this case, so long as latencies | |
2298 | // don't exceed periodic_size msec (default 1.024 sec). | |
2299 | ||
2300 | // FIXME: likewise assumes HC doesn't halt mid-scan | |
2301 | ||
2302 | if (now_uframe == clock) { | |
2303 | unsigned now; | |
2304 | ||
aa16ca30 DB |
2305 | if (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state) |
2306 | || ehci->periodic_sched == 0) | |
1da177e4 LT |
2307 | break; |
2308 | ehci->next_uframe = now_uframe; | |
083522d7 | 2309 | now = ehci_readl(ehci, &ehci->regs->frame_index) % mod; |
1da177e4 LT |
2310 | if (now_uframe == now) |
2311 | break; | |
2312 | ||
2313 | /* rescan the rest of this frame, then ... */ | |
2314 | clock = now; | |
b40e43fc | 2315 | clock_frame = clock >> 3; |
9aa09d2f KW |
2316 | if (ehci->clock_frame != clock_frame) { |
2317 | free_cached_itd_list(ehci); | |
2318 | ehci->clock_frame = clock_frame; | |
2319 | } | |
1da177e4 LT |
2320 | } else { |
2321 | now_uframe++; | |
2322 | now_uframe %= mod; | |
2323 | } | |
53bd6a60 | 2324 | } |
1da177e4 | 2325 | } |