Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2001-2004 by David Brownell |
| 3 | * Copyright (c) 2003 Michal Sojka, for high-speed iso transfers |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 4 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 * |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 47 | periodic_next_shadow(struct ehci_hcd *ehci, union ehci_shadow *periodic, |
| 48 | __hc32 tag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 50 | switch (hc32_to_cpu(ehci, tag)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 66 | union ehci_shadow *prev_p = &ehci->pshadow[frame]; |
| 67 | __hc32 *hw_p = &ehci->periodic[frame]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 72 | prev_p = periodic_next_shadow(ehci, prev_p, |
| 73 | Q_NEXT_TYPE(ehci, *hw_p)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 84 | *prev_p = *periodic_next_shadow(ehci, &here, |
| 85 | Q_NEXT_TYPE(ehci, *hw_p)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 93 | __hc32 *hw_p = &ehci->periodic [frame]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | union ehci_shadow *q = &ehci->pshadow [frame]; |
| 95 | unsigned usecs = 0; |
| 96 | |
| 97 | while (q->ptr) { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 98 | switch (hc32_to_cpu(ehci, Q_NEXT_TYPE(ehci, *hw_p))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | case Q_TYPE_QH: |
| 100 | /* is it in the S-mask? */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 101 | if (q->qh->hw_info2 & cpu_to_hc32(ehci, 1 << uframe)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | usecs += q->qh->usecs; |
| 103 | /* ... or C-mask? */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 104 | if (q->qh->hw_info2 & cpu_to_hc32(ehci, |
| 105 | 1 << (8 + uframe))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 115 | if (q->fstn->hw_prev != EHCI_LIST_END(ehci)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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: |
Karsten Wiese | 3b6fcfd | 2007-12-30 21:55:05 -0800 | [diff] [blame] | 122 | if (q->itd->hw_transaction[uframe]) |
| 123 | usecs += q->itd->stream->usecs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 129 | if (q->sitd->hw_uframe & cpu_to_hc32(ehci, |
| 130 | 1 << uframe)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | if (q->sitd->hw_fullspeed_ep & |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 132 | cpu_to_hc32(ehci, 1<<31)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 & |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 140 | cpu_to_hc32(ehci, 1 << (8 + uframe))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 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 | */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 182 | static inline unsigned char tt_start_uframe(struct ehci_hcd *ehci, __hc32 mask) |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 183 | { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 184 | unsigned char smask = QH_SMASK & hc32_to_cpu(ehci, mask); |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 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 | * |
Joe Perches | dc0d5c1 | 2007-12-17 11:40:18 -0800 | [diff] [blame] | 215 | * For example two separate 100 usec transfers can start in the same uframe, |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 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 | { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 226 | __hc32 *hw_p = &ehci->periodic [frame]; |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 227 | union ehci_shadow *q = &ehci->pshadow [frame]; |
| 228 | unsigned char uf; |
| 229 | |
| 230 | memset(tt_usecs, 0, 16); |
| 231 | |
| 232 | while (q->ptr) { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 233 | switch (hc32_to_cpu(ehci, Q_NEXT_TYPE(ehci, *hw_p))) { |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 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: |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 256 | ehci_dbg(ehci, "ignoring periodic frame %d FSTN\n", |
| 257 | frame); |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 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) { |
Dan Streetman | c065c60 | 2009-04-21 13:37:12 -0400 | [diff] [blame] | 326 | int ufs = (usecs / 125); |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 377 | __hc32 type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | |
| 379 | here = ehci->pshadow [frame]; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 380 | type = Q_NEXT_TYPE(ehci, ehci->periodic [frame]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | while (here.ptr) { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 382 | switch (hc32_to_cpu(ehci, type)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | case Q_TYPE_ITD: |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 384 | type = Q_NEXT_TYPE(ehci, here.itd->hw_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 391 | mask = hc32_to_cpu(ehci, |
| 392 | here.qh->hw_info2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | /* "knows" no gap is needed */ |
| 394 | mask |= mask >> 8; |
| 395 | if (mask & uf_mask) |
| 396 | break; |
| 397 | } |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 398 | type = Q_NEXT_TYPE(ehci, here.qh->hw_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 405 | mask = hc32_to_cpu(ehci, here.sitd |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | ->hw_uframe); |
| 407 | /* FIXME assumes no gap for IN! */ |
| 408 | mask |= mask >> 8; |
| 409 | if (mask & uf_mask) |
| 410 | break; |
| 411 | } |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 412 | type = Q_NEXT_TYPE(ehci, here.sitd->hw_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 431 | #endif /* CONFIG_USB_EHCI_TT_NEWSCHED */ |
| 432 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | /*-------------------------------------------------------------------------*/ |
| 434 | |
| 435 | static int enable_periodic (struct ehci_hcd *ehci) |
| 436 | { |
| 437 | u32 cmd; |
| 438 | int status; |
| 439 | |
David Brownell | 01c1714 | 2008-08-26 23:35:04 -0700 | [diff] [blame] | 440 | if (ehci->periodic_sched++) |
| 441 | return 0; |
| 442 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | /* did clearing PSE did take effect yet? |
| 444 | * takes effect only at frame boundaries... |
| 445 | */ |
Karsten Wiese | c765d4c | 2008-02-16 13:44:42 -0800 | [diff] [blame] | 446 | status = handshake_on_error_set_halt(ehci, &ehci->regs->status, |
| 447 | STS_PSS, 0, 9 * 125); |
| 448 | if (status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | |
Benjamin Herrenschmidt | 083522d | 2006-12-15 06:54:08 +1100 | [diff] [blame] | 451 | cmd = ehci_readl(ehci, &ehci->regs->command) | CMD_PSE; |
| 452 | ehci_writel(ehci, cmd, &ehci->regs->command); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | /* posted write ... PSS happens later */ |
| 454 | ehci_to_hcd(ehci)->state = HC_STATE_RUNNING; |
| 455 | |
| 456 | /* make sure ehci_work scans these */ |
Benjamin Herrenschmidt | 083522d | 2006-12-15 06:54:08 +1100 | [diff] [blame] | 457 | ehci->next_uframe = ehci_readl(ehci, &ehci->regs->frame_index) |
| 458 | % (ehci->periodic_size << 3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | return 0; |
| 460 | } |
| 461 | |
| 462 | static int disable_periodic (struct ehci_hcd *ehci) |
| 463 | { |
| 464 | u32 cmd; |
| 465 | int status; |
| 466 | |
David Brownell | 01c1714 | 2008-08-26 23:35:04 -0700 | [diff] [blame] | 467 | if (--ehci->periodic_sched) |
| 468 | return 0; |
| 469 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | /* did setting PSE not take effect yet? |
| 471 | * takes effect only at frame boundaries... |
| 472 | */ |
Karsten Wiese | c765d4c | 2008-02-16 13:44:42 -0800 | [diff] [blame] | 473 | status = handshake_on_error_set_halt(ehci, &ehci->regs->status, |
| 474 | STS_PSS, STS_PSS, 9 * 125); |
| 475 | if (status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | |
Benjamin Herrenschmidt | 083522d | 2006-12-15 06:54:08 +1100 | [diff] [blame] | 478 | cmd = ehci_readl(ehci, &ehci->regs->command) & ~CMD_PSE; |
| 479 | ehci_writel(ehci, cmd, &ehci->regs->command); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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", |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 501 | period, hc32_to_cpup(ehci, &qh->hw_info2) & (QH_CMASK | QH_SMASK), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 509 | union ehci_shadow *prev = &ehci->pshadow[i]; |
| 510 | __hc32 *hw_p = &ehci->periodic[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | union ehci_shadow here = *prev; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 512 | __hc32 type = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | |
| 514 | /* skip the iso nodes at list head */ |
| 515 | while (here.ptr) { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 516 | type = Q_NEXT_TYPE(ehci, *hw_p); |
| 517 | if (type == cpu_to_hc32(ehci, Q_TYPE_QH)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | break; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 519 | prev = periodic_next_shadow(ehci, prev, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 541 | *hw_p = QH_NEXT (ehci, qh->qh_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
David Brownell | 01c1714 | 2008-08-26 23:35:04 -0700 | [diff] [blame] | 553 | return enable_periodic(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | } |
| 555 | |
David Brownell | 01c1714 | 2008-08-26 23:35:04 -0700 | [diff] [blame] | 556 | static int qh_unlink_periodic(struct ehci_hcd *ehci, struct ehci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Harvey Harrison | 551509d | 2009-02-11 14:11:36 -0800 | [diff] [blame] | 566 | // qh->hw_info1 |= cpu_to_hc32(1 << 7 /* "ignore" */); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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", |
David Brownell | 7dedacf | 2005-08-04 18:06:41 -0700 | [diff] [blame] | 582 | qh->period, |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 583 | hc32_to_cpup(ehci, &qh->hw_info2) & (QH_CMASK | QH_SMASK), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
David Brownell | 01c1714 | 2008-08-26 23:35:04 -0700 | [diff] [blame] | 592 | return disable_periodic(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 607 | || (cpu_to_hc32(ehci, QH_CMASK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 615 | qh->hw_next = EHCI_LIST_END(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | wmb (); |
| 617 | } |
| 618 | |
| 619 | /*-------------------------------------------------------------------------*/ |
| 620 | |
| 621 | static int check_period ( |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 622 | struct ehci_hcd *ehci, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 638 | * convert "usecs we need" to "max already claimed" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 ( |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 668 | struct ehci_hcd *ehci, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | unsigned frame, |
| 670 | unsigned uframe, |
| 671 | const struct ehci_qh *qh, |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 672 | __hc32 *c_maskp |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | ) |
| 674 | { |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 675 | int retval = -ENOSPC; |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 676 | u8 mask = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 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 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 704 | *c_maskp = cpu_to_hc32(ehci, mask << 8); |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 705 | } |
| 706 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 710 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | * NOTE: both SPLIT and CSPLIT could be checked in just |
| 712 | * one smart pass... |
| 713 | */ |
| 714 | mask = 0x03 << (uframe + qh->gap_uf); |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 715 | *c_maskp = cpu_to_hc32(ehci, mask << 8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 727 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 735 | static int qh_schedule(struct ehci_hcd *ehci, struct ehci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | { |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 737 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | unsigned uframe; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 739 | __hc32 c_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | unsigned frame; /* 0..(qh->period - 1), or NO_FRAME */ |
| 741 | |
| 742 | qh_refresh(ehci, qh); |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 743 | qh->hw_next = EHCI_LIST_END(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | frame = qh->start; |
| 745 | |
| 746 | /* reuse the previous schedule slots, if we can */ |
| 747 | if (frame < qh->period) { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 748 | uframe = ffs(hc32_to_cpup(ehci, &qh->hw_info2) & QH_SMASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) { |
Alan Stern | 68335e8 | 2009-05-22 17:02:33 -0400 | [diff] [blame] | 763 | int i; |
| 764 | |
| 765 | for (i = qh->period; status && i > 0; --i) { |
| 766 | frame = ++ehci->random_frame % qh->period; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Alan Stern | 68335e8 | 2009-05-22 17:02:33 -0400 | [diff] [blame] | 774 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 786 | qh->hw_info2 &= cpu_to_hc32(ehci, ~(QH_CMASK | QH_SMASK)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | qh->hw_info2 |= qh->period |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 788 | ? cpu_to_hc32(ehci, 1 << uframe) |
| 789 | : cpu_to_hc32(ehci, QH_SMASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 795 | status = qh_link_periodic (ehci, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | done: |
| 797 | return status; |
| 798 | } |
| 799 | |
| 800 | static int intr_submit ( |
| 801 | struct ehci_hcd *ehci, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | struct urb *urb, |
| 803 | struct list_head *qtd_list, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 804 | gfp_t mem_flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | ) { |
| 806 | unsigned epnum; |
| 807 | unsigned long flags; |
| 808 | struct ehci_qh *qh; |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 809 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | struct list_head empty; |
| 811 | |
| 812 | /* get endpoint and transfer/schedule data */ |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 813 | epnum = urb->ep->desc.bEndpointAddress; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | |
| 815 | spin_lock_irqsave (&ehci->lock, flags); |
| 816 | |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 817 | if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 818 | &ehci_to_hcd(ehci)->flags))) { |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 819 | status = -ESHUTDOWN; |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 820 | goto done_not_linked; |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 821 | } |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 822 | status = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb); |
| 823 | if (unlikely(status)) |
| 824 | goto done_not_linked; |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 825 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | /* get qh and force any scheduling errors */ |
| 827 | INIT_LIST_HEAD (&empty); |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 828 | qh = qh_append_tds(ehci, urb, &empty, epnum, &urb->ep->hcpriv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 839 | qh = qh_append_tds(ehci, urb, qtd_list, epnum, &urb->ep->hcpriv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | BUG_ON (qh == NULL); |
| 841 | |
| 842 | /* ... update usbfs periodic stats */ |
| 843 | ehci_to_hcd(ehci)->self.bandwidth_int_reqs++; |
| 844 | |
| 845 | done: |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 846 | if (unlikely(status)) |
| 847 | usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb); |
| 848 | done_not_linked: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 * |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 861 | iso_stream_alloc (gfp_t mem_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | { |
| 863 | struct ehci_iso_stream *stream; |
| 864 | |
Pekka Enberg | 7b842b6 | 2005-09-06 15:18:34 -0700 | [diff] [blame] | 865 | stream = kzalloc(sizeof *stream, mem_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | if (likely (stream != NULL)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Alan Stern | 372dd6e | 2008-11-12 17:02:57 -0500 | [diff] [blame] | 923 | bandwidth /= interval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | |
| 925 | } else { |
| 926 | u32 addr; |
david-b@pacbell.net | d038420 | 2005-08-13 18:44:58 -0700 | [diff] [blame] | 927 | int think_time; |
Clemens Ladisch | 469d022 | 2006-01-20 13:49:10 -0800 | [diff] [blame] | 928 | int hs_transfers; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
david-b@pacbell.net | d038420 | 2005-08-13 18:44:58 -0700 | [diff] [blame] | 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)); |
Clemens Ladisch | 469d022 | 2006-01-20 13:49:10 -0800 | [diff] [blame] | 941 | hs_transfers = max (1u, (maxp + 187) / 188); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Clemens Ladisch | 469d022 | 2006-01-20 13:49:10 -0800 | [diff] [blame] | 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | } else |
Clemens Ladisch | 469d022 | 2006-01-20 13:49:10 -0800 | [diff] [blame] | 954 | stream->raw_mask = smask_out [hs_transfers - 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | bandwidth = stream->usecs + stream->c_usecs; |
Alan Stern | 372dd6e | 2008-11-12 17:02:57 -0500 | [diff] [blame] | 956 | bandwidth /= interval << 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | |
| 958 | /* stream->splits gets created from raw_mask later */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 959 | stream->address = cpu_to_hc32(ehci, addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Karsten Wiese | 9aa09d2 | 2009-02-08 16:07:58 -0800 | [diff] [blame] | 1009 | if (stream->ep) |
| 1010 | stream->ep->hcpriv = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 * |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 1080 | iso_sched_alloc (unsigned packets, gfp_t mem_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | { |
| 1082 | struct ehci_iso_sched *iso_sched; |
| 1083 | int size = sizeof *iso_sched; |
| 1084 | |
| 1085 | size += packets * sizeof (struct ehci_iso_packet); |
Eric Sesterhenn | 80b6ca4 | 2006-02-27 21:29:43 +0100 | [diff] [blame] | 1086 | iso_sched = kzalloc(size, mem_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | if (likely (iso_sched != NULL)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | INIT_LIST_HEAD (&iso_sched->td_list); |
| 1089 | } |
| 1090 | return iso_sched; |
| 1091 | } |
| 1092 | |
| 1093 | static inline void |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1094 | itd_sched_init( |
| 1095 | struct ehci_hcd *ehci, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1125 | uframe->transaction = cpu_to_hc32(ehci, trans); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | |
David Brownell | 7707857 | 2005-05-28 10:46:18 -0700 | [diff] [blame] | 1127 | /* might need to cross a buffer page within a uframe */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 1153 | gfp_t mem_flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1167 | itd_sched_init(ehci, sched, stream, urb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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, |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1185 | struct ehci_itd, itd_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | list_del (&itd->itd_list); |
| 1187 | itd_dma = itd->itd_dma; |
Karsten Wiese | 3d01f0f | 2008-02-19 12:31:49 -0800 | [diff] [blame] | 1188 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Karsten Wiese | 3d01f0f | 2008-02-19 12:31:49 -0800 | [diff] [blame] | 1193 | if (!itd) { |
| 1194 | iso_sched_free(stream, sched); |
| 1195 | spin_unlock_irqrestore(&ehci->lock, flags); |
| 1196 | return -ENOMEM; |
| 1197 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | } |
| 1199 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 1281 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) { |
Clemens Ladisch | 0c73462 | 2006-01-22 10:32:49 -0800 | [diff] [blame] | 1292 | uf = uframe & 7; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1309 | stream->splits = cpu_to_hc32(ehci, stream->raw_mask << (uframe & 7)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Benjamin Herrenschmidt | 083522d | 2006-12-15 06:54:08 +1100 | [diff] [blame] | 1351 | now = ehci_readl(ehci, &ehci->regs->frame_index) % mod; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | |
| 1353 | /* when's the last uframe this urb could start? */ |
| 1354 | max = now + mod; |
| 1355 | |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | */ |
| 1361 | if (likely (!list_empty (&stream->td_list))) { |
| 1362 | start = stream->next_uframe; |
| 1363 | if (start < now) |
| 1364 | start += mod; |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1439 | itd_init(struct ehci_hcd *ehci, struct ehci_iso_stream *stream, |
| 1440 | struct ehci_itd *itd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1441 | { |
| 1442 | int i; |
| 1443 | |
David Brownell | 7707857 | 2005-05-28 10:46:18 -0700 | [diff] [blame] | 1444 | /* it's been recently zeroed */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1445 | itd->hw_next = EHCI_LIST_END(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1457 | itd_patch( |
| 1458 | struct ehci_hcd *ehci, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | struct ehci_itd *itd, |
| 1460 | struct ehci_iso_sched *iso_sched, |
| 1461 | unsigned index, |
David Brownell | 7707857 | 2005-05-28 10:46:18 -0700 | [diff] [blame] | 1462 | u16 uframe |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 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)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1477 | |
| 1478 | /* iso_frame_desc[].offset must be strictly increasing */ |
David Brownell | 7707857 | 2005-05-28 10:46:18 -0700 | [diff] [blame] | 1479 | if (unlikely (uf->cross)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1480 | u64 bufp = uf->bufp + 4096; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1481 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | itd->pg = ++pg; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 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)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 (); |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1497 | ehci->periodic[frame] = cpu_to_hc32(ehci, itd->itd_dma | Q_TYPE_ITD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | { |
David Brownell | 7707857 | 2005-05-28 10:46:18 -0700 | [diff] [blame] | 1509 | int packet; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Karsten Wiese | 508db8c | 2009-02-26 01:47:48 +0100 | [diff] [blame] | 1541 | itd->urb = urb; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1542 | itd_init (ehci, stream, itd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | } |
| 1544 | |
| 1545 | uframe = next_uframe & 0x07; |
| 1546 | frame = next_uframe >> 3; |
| 1547 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1548 | itd_patch(ehci, itd, iso_sched, packet, uframe); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
David Brownell | 01c1714 | 2008-08-26 23:35:04 -0700 | [diff] [blame] | 1569 | return enable_periodic(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1570 | } |
| 1571 | |
| 1572 | #define ISO_ERRS (EHCI_ISOC_BUF_ERR | EHCI_ISOC_BABBLE | EHCI_ISOC_XACTERR) |
| 1573 | |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 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 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | static unsigned |
| 1585 | itd_complete ( |
| 1586 | struct ehci_hcd *ehci, |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1587 | struct ehci_itd *itd |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 1596 | unsigned retval = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1605 | t = hc32_to_cpup(ehci, &itd->hw_transaction [uframe]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 1627 | } else { |
| 1628 | /* URB was too late */ |
| 1629 | desc->status = -EXDEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | } |
| 1631 | } |
| 1632 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1633 | /* handle completion now? */ |
| 1634 | if (likely ((urb_index + 1) != urb->number_of_packets)) |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 1635 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
David Brownell | aa16ca3 | 2007-12-30 23:45:19 -0800 | [diff] [blame] | 1642 | /* give urb back to the driver; completion often (re)submits */ |
Alan Stern | 6a8e87b | 2006-01-19 10:46:27 -0500 | [diff] [blame] | 1643 | dev = urb->dev; |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 1644 | ehci_urb_done(ehci, urb, 0); |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 1645 | retval = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | urb = NULL; |
David Brownell | 01c1714 | 2008-08-26 23:35:04 -0700 | [diff] [blame] | 1647 | (void) disable_periodic(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs--; |
| 1649 | |
Karsten Wiese | 508db8c | 2009-02-26 01:47:48 +0100 | [diff] [blame] | 1650 | if (unlikely(list_is_singular(&stream->td_list))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Karsten Wiese | 9aa09d2 | 2009-02-08 16:07:58 -0800 | [diff] [blame] | 1659 | |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 1660 | done: |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 1661 | itd->urb = NULL; |
Karsten Wiese | 9aa09d2 | 2009-02-08 16:07:58 -0800 | [diff] [blame] | 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 | } |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 1680 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | } |
| 1682 | |
| 1683 | /*-------------------------------------------------------------------------*/ |
| 1684 | |
Olav Kongas | 5db539e | 2005-06-23 20:25:36 +0300 | [diff] [blame] | 1685 | static int itd_submit (struct ehci_hcd *ehci, struct urb *urb, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 1686 | gfp_t mem_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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", |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1707 | __func__, urb->dev->devpath, urb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1724 | if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1725 | &ehci_to_hcd(ehci)->flags))) { |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1726 | status = -ESHUTDOWN; |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 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); |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 1733 | if (likely (status == 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1734 | itd_link_urb (ehci, urb, ehci->periodic_size << 3, stream); |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1735 | else |
| 1736 | usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb); |
| 1737 | done_not_linked: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1754 | sitd_sched_init( |
| 1755 | struct ehci_hcd *ehci, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1784 | packet->transaction = cpu_to_hc32(ehci, trans); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 1792 | /* OUT uses multiple start-splits */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 1807 | gfp_t mem_flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1820 | sitd_sched_init(ehci, iso_sched, stream, urb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Karsten Wiese | 3d01f0f | 2008-02-19 12:31:49 -0800 | [diff] [blame] | 1841 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Karsten Wiese | 3d01f0f | 2008-02-19 12:31:49 -0800 | [diff] [blame] | 1846 | if (!sitd) { |
| 1847 | iso_sched_free(stream, iso_sched); |
| 1848 | spin_unlock_irqrestore(&ehci->lock, flags); |
| 1849 | return -ENOMEM; |
| 1850 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1851 | } |
| 1852 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1869 | sitd_patch( |
| 1870 | struct ehci_hcd *ehci, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1880 | sitd->hw_next = EHCI_LIST_END(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1881 | sitd->hw_fullspeed_ep = stream->address; |
| 1882 | sitd->hw_uframe = stream->splits; |
| 1883 | sitd->hw_results = uf->transaction; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1884 | sitd->hw_backpointer = EHCI_LIST_END(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1885 | |
| 1886 | bufp = uf->bufp; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1887 | sitd->hw_buf[0] = cpu_to_hc32(ehci, bufp); |
| 1888 | sitd->hw_buf_hi[0] = cpu_to_hc32(ehci, bufp >> 32); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1889 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1890 | sitd->hw_buf[1] = cpu_to_hc32(ehci, uf->buf1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1891 | if (uf->cross) |
| 1892 | bufp += 4096; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1893 | sitd->hw_buf_hi[1] = cpu_to_hc32(ehci, bufp >> 32); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 (); |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1906 | ehci->periodic[frame] = cpu_to_hc32(ehci, sitd->sitd_dma | Q_TYPE_SITD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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, |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1934 | stream->interval, hc32_to_cpu(ehci, stream->splits)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Karsten Wiese | 508db8c | 2009-02-26 01:47:48 +0100 | [diff] [blame] | 1953 | sitd->urb = urb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1954 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1955 | sitd_patch(ehci, stream, sitd, sched, packet); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
David Brownell | 01c1714 | 2008-08-26 23:35:04 -0700 | [diff] [blame] | 1969 | return enable_periodic(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1970 | } |
| 1971 | |
| 1972 | /*-------------------------------------------------------------------------*/ |
| 1973 | |
| 1974 | #define SITD_ERRS (SITD_STS_ERR | SITD_STS_DBE | SITD_STS_BABBLE \ |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 1975 | | SITD_STS_XACT | SITD_STS_MMF) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 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 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1987 | static unsigned |
| 1988 | sitd_complete ( |
| 1989 | struct ehci_hcd *ehci, |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1990 | struct ehci_sitd *sitd |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 1998 | unsigned retval = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1999 | |
| 2000 | urb_index = sitd->index; |
| 2001 | desc = &urb->iso_frame_desc [urb_index]; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2002 | t = hc32_to_cpup(ehci, &sitd->hw_results); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | stream->depth -= stream->interval << 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2020 | |
| 2021 | /* handle completion now? */ |
| 2022 | if ((urb_index + 1) != urb->number_of_packets) |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 2023 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
David Brownell | aa16ca3 | 2007-12-30 23:45:19 -0800 | [diff] [blame] | 2030 | /* give urb back to the driver; completion often (re)submits */ |
Alan Stern | 6a8e87b | 2006-01-19 10:46:27 -0500 | [diff] [blame] | 2031 | dev = urb->dev; |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 2032 | ehci_urb_done(ehci, urb, 0); |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 2033 | retval = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2034 | urb = NULL; |
David Brownell | 01c1714 | 2008-08-26 23:35:04 -0700 | [diff] [blame] | 2035 | (void) disable_periodic(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2036 | ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs--; |
| 2037 | |
Karsten Wiese | 508db8c | 2009-02-26 01:47:48 +0100 | [diff] [blame] | 2038 | if (list_is_singular(&stream->td_list)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 2047 | /* OK to recycle this SITD now that its completion callback ran. */ |
| 2048 | done: |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 2049 | sitd->urb = NULL; |
| 2050 | sitd->stream = NULL; |
| 2051 | list_move(&sitd->sitd_list, &stream->free_list); |
| 2052 | iso_stream_put(ehci, stream); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2053 | |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 2054 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2055 | } |
| 2056 | |
| 2057 | |
Olav Kongas | 5db539e | 2005-06-23 20:25:36 +0300 | [diff] [blame] | 2058 | static int sitd_submit (struct ehci_hcd *ehci, struct urb *urb, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 2059 | gfp_t mem_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 2095 | if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 2096 | &ehci_to_hcd(ehci)->flags))) { |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 2097 | status = -ESHUTDOWN; |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 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); |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 2104 | if (status == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2105 | sitd_link_urb (ehci, urb, ehci->periodic_size << 3, stream); |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 2106 | else |
| 2107 | usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb); |
| 2108 | done_not_linked: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2117 | /*-------------------------------------------------------------------------*/ |
| 2118 | |
Karsten Wiese | 9aa09d2 | 2009-02-08 16:07:58 -0800 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2133 | static void |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 2134 | scan_periodic (struct ehci_hcd *ehci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2135 | { |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 2136 | unsigned now_uframe, frame, clock, clock_frame, mod; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Karsten Wiese | 9aa09d2 | 2009-02-08 16:07:58 -0800 | [diff] [blame] | 2147 | if (HC_IS_RUNNING(ehci_to_hcd(ehci)->state)) { |
Benjamin Herrenschmidt | 083522d | 2006-12-15 06:54:08 +1100 | [diff] [blame] | 2148 | clock = ehci_readl(ehci, &ehci->regs->frame_index); |
Karsten Wiese | 9aa09d2 | 2009-02-08 16:07:58 -0800 | [diff] [blame] | 2149 | clock_frame = (clock >> 3) % ehci->periodic_size; |
| 2150 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2151 | clock = now_uframe + mod - 1; |
Karsten Wiese | 9aa09d2 | 2009-02-08 16:07:58 -0800 | [diff] [blame] | 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 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2158 | clock %= mod; |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 2159 | clock_frame = clock >> 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2160 | |
| 2161 | for (;;) { |
| 2162 | union ehci_shadow q, *q_p; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2163 | __hc32 type, *hw_p; |
David Brownell | 79592b72 | 2008-01-07 00:47:42 -0800 | [diff] [blame] | 2164 | unsigned incomplete = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2166 | frame = now_uframe >> 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2173 | type = Q_NEXT_TYPE(ehci, *hw_p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2182 | switch (hc32_to_cpu(ehci, type)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2183 | case Q_TYPE_QH: |
| 2184 | /* handle any completions */ |
| 2185 | temp.qh = qh_get (q.qh); |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2186 | type = Q_NEXT_TYPE(ehci, q.qh->hw_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2187 | q = q.qh->qh_next; |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 2188 | modified = qh_completions (ehci, temp.qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2197 | if (q.fstn->hw_prev != EHCI_LIST_END(ehci)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2198 | dbg ("ignoring completions from FSTNs"); |
| 2199 | } |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2200 | type = Q_NEXT_TYPE(ehci, q.fstn->hw_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2201 | q = q.fstn->fstn_next; |
| 2202 | break; |
| 2203 | case Q_TYPE_ITD: |
David Brownell | 79592b72 | 2008-01-07 00:47:42 -0800 | [diff] [blame] | 2204 | /* If this ITD is still active, leave it for |
| 2205 | * later processing ... check the next entry. |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 2206 | * No need to check for activity unless the |
| 2207 | * frame is current. |
David Brownell | 79592b72 | 2008-01-07 00:47:42 -0800 | [diff] [blame] | 2208 | */ |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 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, |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2221 | q.itd->hw_next); |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 2222 | q = *q_p; |
| 2223 | break; |
| 2224 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2225 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2226 | |
David Brownell | 79592b72 | 2008-01-07 00:47:42 -0800 | [diff] [blame] | 2227 | /* Take finished ITDs out of the schedule |
| 2228 | * and process them: recycle, maybe report |
| 2229 | * URB completion. HC won't cache the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2230 | * pointer for much longer, if at all. |
| 2231 | */ |
| 2232 | *q_p = q.itd->itd_next; |
| 2233 | *hw_p = q.itd->hw_next; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2234 | type = Q_NEXT_TYPE(ehci, q.itd->hw_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2235 | wmb(); |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 2236 | modified = itd_complete (ehci, q.itd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2237 | q = *q_p; |
| 2238 | break; |
| 2239 | case Q_TYPE_SITD: |
David Brownell | 79592b72 | 2008-01-07 00:47:42 -0800 | [diff] [blame] | 2240 | /* If this SITD is still active, leave it for |
| 2241 | * later processing ... check the next entry. |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 2242 | * No need to check for activity unless the |
| 2243 | * frame is current. |
David Brownell | 79592b72 | 2008-01-07 00:47:42 -0800 | [diff] [blame] | 2244 | */ |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 2245 | if (frame == clock_frame && live && |
| 2246 | (q.sitd->hw_results & |
| 2247 | SITD_ACTIVE(ehci))) { |
David Brownell | 79592b72 | 2008-01-07 00:47:42 -0800 | [diff] [blame] | 2248 | incomplete = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2249 | q_p = &q.sitd->sitd_next; |
| 2250 | hw_p = &q.sitd->hw_next; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2251 | type = Q_NEXT_TYPE(ehci, |
| 2252 | q.sitd->hw_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2253 | q = *q_p; |
| 2254 | break; |
| 2255 | } |
David Brownell | 79592b72 | 2008-01-07 00:47:42 -0800 | [diff] [blame] | 2256 | |
| 2257 | /* Take finished SITDs out of the schedule |
| 2258 | * and process them: recycle, maybe report |
| 2259 | * URB completion. |
| 2260 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2261 | *q_p = q.sitd->sitd_next; |
| 2262 | *hw_p = q.sitd->hw_next; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2263 | type = Q_NEXT_TYPE(ehci, q.sitd->hw_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2264 | wmb(); |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 2265 | modified = sitd_complete (ehci, q.sitd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
David Brownell | aa16ca3 | 2007-12-30 23:45:19 -0800 | [diff] [blame] | 2276 | if (unlikely (modified)) { |
| 2277 | if (likely(ehci->periodic_sched > 0)) |
| 2278 | goto restart; |
David Brownell | 01c1714 | 2008-08-26 23:35:04 -0700 | [diff] [blame] | 2279 | /* short-circuit this scan */ |
David Brownell | aa16ca3 | 2007-12-30 23:45:19 -0800 | [diff] [blame] | 2280 | now_uframe = clock; |
| 2281 | break; |
| 2282 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2283 | } |
| 2284 | |
David Brownell | 79592b72 | 2008-01-07 00:47:42 -0800 | [diff] [blame] | 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 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
David Brownell | aa16ca3 | 2007-12-30 23:45:19 -0800 | [diff] [blame] | 2305 | if (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state) |
| 2306 | || ehci->periodic_sched == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2307 | break; |
| 2308 | ehci->next_uframe = now_uframe; |
Benjamin Herrenschmidt | 083522d | 2006-12-15 06:54:08 +1100 | [diff] [blame] | 2309 | now = ehci_readl(ehci, &ehci->regs->frame_index) % mod; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2310 | if (now_uframe == now) |
| 2311 | break; |
| 2312 | |
| 2313 | /* rescan the rest of this frame, then ... */ |
| 2314 | clock = now; |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 2315 | clock_frame = clock >> 3; |
Karsten Wiese | 9aa09d2 | 2009-02-08 16:07:58 -0800 | [diff] [blame] | 2316 | if (ehci->clock_frame != clock_frame) { |
| 2317 | free_cached_itd_list(ehci); |
| 2318 | ehci->clock_frame = clock_frame; |
| 2319 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2320 | } else { |
| 2321 | now_uframe++; |
| 2322 | now_uframe %= mod; |
| 2323 | } |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 2324 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2325 | } |