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 | |
Alan Stern | 68aa95d | 2011-10-12 10:39:14 -0400 | [diff] [blame] | 39 | #ifdef CONFIG_PCI |
| 40 | |
| 41 | static unsigned ehci_read_frame_index(struct ehci_hcd *ehci) |
| 42 | { |
| 43 | unsigned uf; |
| 44 | |
| 45 | /* |
| 46 | * The MosChip MCS9990 controller updates its microframe counter |
| 47 | * a little before the frame counter, and occasionally we will read |
| 48 | * the invalid intermediate value. Avoid problems by checking the |
| 49 | * microframe number (the low-order 3 bits); if they are 0 then |
| 50 | * re-read the register to get the correct value. |
| 51 | */ |
| 52 | uf = ehci_readl(ehci, &ehci->regs->frame_index); |
| 53 | if (unlikely(ehci->frame_index_bug && ((uf & 7) == 0))) |
| 54 | uf = ehci_readl(ehci, &ehci->regs->frame_index); |
| 55 | return uf; |
| 56 | } |
| 57 | |
| 58 | #endif |
| 59 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | /*-------------------------------------------------------------------------*/ |
| 61 | |
| 62 | /* |
| 63 | * periodic_next_shadow - return "next" pointer on shadow list |
| 64 | * @periodic: host pointer to qh/itd/sitd |
| 65 | * @tag: hardware tag for type of this record |
| 66 | */ |
| 67 | static union ehci_shadow * |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 68 | periodic_next_shadow(struct ehci_hcd *ehci, union ehci_shadow *periodic, |
| 69 | __hc32 tag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 71 | switch (hc32_to_cpu(ehci, tag)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | case Q_TYPE_QH: |
| 73 | return &periodic->qh->qh_next; |
| 74 | case Q_TYPE_FSTN: |
| 75 | return &periodic->fstn->fstn_next; |
| 76 | case Q_TYPE_ITD: |
| 77 | return &periodic->itd->itd_next; |
| 78 | // case Q_TYPE_SITD: |
| 79 | default: |
| 80 | return &periodic->sitd->sitd_next; |
| 81 | } |
| 82 | } |
| 83 | |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 84 | static __hc32 * |
| 85 | shadow_next_periodic(struct ehci_hcd *ehci, union ehci_shadow *periodic, |
| 86 | __hc32 tag) |
| 87 | { |
| 88 | switch (hc32_to_cpu(ehci, tag)) { |
| 89 | /* our ehci_shadow.qh is actually software part */ |
| 90 | case Q_TYPE_QH: |
| 91 | return &periodic->qh->hw->hw_next; |
| 92 | /* others are hw parts */ |
| 93 | default: |
| 94 | return periodic->hw_next; |
| 95 | } |
| 96 | } |
| 97 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | /* caller must hold ehci->lock */ |
| 99 | static void periodic_unlink (struct ehci_hcd *ehci, unsigned frame, void *ptr) |
| 100 | { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 101 | union ehci_shadow *prev_p = &ehci->pshadow[frame]; |
| 102 | __hc32 *hw_p = &ehci->periodic[frame]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | union ehci_shadow here = *prev_p; |
| 104 | |
| 105 | /* find predecessor of "ptr"; hw and shadow lists are in sync */ |
| 106 | while (here.ptr && here.ptr != ptr) { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 107 | prev_p = periodic_next_shadow(ehci, prev_p, |
| 108 | Q_NEXT_TYPE(ehci, *hw_p)); |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 109 | hw_p = shadow_next_periodic(ehci, &here, |
| 110 | Q_NEXT_TYPE(ehci, *hw_p)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | here = *prev_p; |
| 112 | } |
| 113 | /* an interrupt entry (at list end) could have been shared */ |
| 114 | if (!here.ptr) |
| 115 | return; |
| 116 | |
| 117 | /* update shadow and hardware lists ... the old "next" pointers |
| 118 | * from ptr may still be in use, the caller updates them. |
| 119 | */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 120 | *prev_p = *periodic_next_shadow(ehci, &here, |
| 121 | Q_NEXT_TYPE(ehci, *hw_p)); |
Andiry Xu | 3d091a6 | 2010-11-08 17:58:35 +0800 | [diff] [blame] | 122 | |
| 123 | if (!ehci->use_dummy_qh || |
| 124 | *shadow_next_periodic(ehci, &here, Q_NEXT_TYPE(ehci, *hw_p)) |
| 125 | != EHCI_LIST_END(ehci)) |
| 126 | *hw_p = *shadow_next_periodic(ehci, &here, |
| 127 | Q_NEXT_TYPE(ehci, *hw_p)); |
| 128 | else |
| 129 | *hw_p = ehci->dummy->qh_dma; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | /* how many of the uframe's 125 usecs are allocated? */ |
| 133 | static unsigned short |
| 134 | periodic_usecs (struct ehci_hcd *ehci, unsigned frame, unsigned uframe) |
| 135 | { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 136 | __hc32 *hw_p = &ehci->periodic [frame]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | union ehci_shadow *q = &ehci->pshadow [frame]; |
| 138 | unsigned usecs = 0; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 139 | struct ehci_qh_hw *hw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
| 141 | while (q->ptr) { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 142 | switch (hc32_to_cpu(ehci, Q_NEXT_TYPE(ehci, *hw_p))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | case Q_TYPE_QH: |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 144 | hw = q->qh->hw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | /* is it in the S-mask? */ |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 146 | if (hw->hw_info2 & cpu_to_hc32(ehci, 1 << uframe)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | usecs += q->qh->usecs; |
| 148 | /* ... or C-mask? */ |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 149 | if (hw->hw_info2 & cpu_to_hc32(ehci, |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 150 | 1 << (8 + uframe))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | usecs += q->qh->c_usecs; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 152 | hw_p = &hw->hw_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | q = &q->qh->qh_next; |
| 154 | break; |
| 155 | // case Q_TYPE_FSTN: |
| 156 | default: |
| 157 | /* for "save place" FSTNs, count the relevant INTR |
| 158 | * bandwidth from the previous frame |
| 159 | */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 160 | if (q->fstn->hw_prev != EHCI_LIST_END(ehci)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | ehci_dbg (ehci, "ignoring FSTN cost ...\n"); |
| 162 | } |
| 163 | hw_p = &q->fstn->hw_next; |
| 164 | q = &q->fstn->fstn_next; |
| 165 | break; |
| 166 | case Q_TYPE_ITD: |
Karsten Wiese | 3b6fcfd | 2007-12-30 21:55:05 -0800 | [diff] [blame] | 167 | if (q->itd->hw_transaction[uframe]) |
| 168 | usecs += q->itd->stream->usecs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | hw_p = &q->itd->hw_next; |
| 170 | q = &q->itd->itd_next; |
| 171 | break; |
| 172 | case Q_TYPE_SITD: |
| 173 | /* is it in the S-mask? (count SPLIT, DATA) */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 174 | if (q->sitd->hw_uframe & cpu_to_hc32(ehci, |
| 175 | 1 << uframe)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | if (q->sitd->hw_fullspeed_ep & |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 177 | cpu_to_hc32(ehci, 1<<31)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | usecs += q->sitd->stream->usecs; |
| 179 | else /* worst case for OUT start-split */ |
| 180 | usecs += HS_USECS_ISO (188); |
| 181 | } |
| 182 | |
| 183 | /* ... C-mask? (count CSPLIT, DATA) */ |
| 184 | if (q->sitd->hw_uframe & |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 185 | cpu_to_hc32(ehci, 1 << (8 + uframe))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | /* worst case for IN complete-split */ |
| 187 | usecs += q->sitd->stream->c_usecs; |
| 188 | } |
| 189 | |
| 190 | hw_p = &q->sitd->hw_next; |
| 191 | q = &q->sitd->sitd_next; |
| 192 | break; |
| 193 | } |
| 194 | } |
| 195 | #ifdef DEBUG |
Kirill Smelkov | cc62a7e | 2011-07-03 20:36:57 +0400 | [diff] [blame] | 196 | if (usecs > ehci->uframe_periodic_max) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | ehci_err (ehci, "uframe %d sched overrun: %d usecs\n", |
| 198 | frame * 8 + uframe, usecs); |
| 199 | #endif |
| 200 | return usecs; |
| 201 | } |
| 202 | |
| 203 | /*-------------------------------------------------------------------------*/ |
| 204 | |
| 205 | static int same_tt (struct usb_device *dev1, struct usb_device *dev2) |
| 206 | { |
| 207 | if (!dev1->tt || !dev2->tt) |
| 208 | return 0; |
| 209 | if (dev1->tt != dev2->tt) |
| 210 | return 0; |
| 211 | if (dev1->tt->multi) |
| 212 | return dev1->ttport == dev2->ttport; |
| 213 | else |
| 214 | return 1; |
| 215 | } |
| 216 | |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 217 | #ifdef CONFIG_USB_EHCI_TT_NEWSCHED |
| 218 | |
| 219 | /* Which uframe does the low/fullspeed transfer start in? |
| 220 | * |
| 221 | * The parameter is the mask of ssplits in "H-frame" terms |
| 222 | * and this returns the transfer start uframe in "B-frame" terms, |
| 223 | * which allows both to match, e.g. a ssplit in "H-frame" uframe 0 |
| 224 | * will cause a transfer in "B-frame" uframe 0. "B-frames" lag |
| 225 | * "H-frames" by 1 uframe. See the EHCI spec sec 4.5 and figure 4.7. |
| 226 | */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 227 | 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] | 228 | { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 229 | unsigned char smask = QH_SMASK & hc32_to_cpu(ehci, mask); |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 230 | if (!smask) { |
| 231 | ehci_err(ehci, "invalid empty smask!\n"); |
| 232 | /* uframe 7 can't have bw so this will indicate failure */ |
| 233 | return 7; |
| 234 | } |
| 235 | return ffs(smask) - 1; |
| 236 | } |
| 237 | |
| 238 | static const unsigned char |
| 239 | max_tt_usecs[] = { 125, 125, 125, 125, 125, 125, 30, 0 }; |
| 240 | |
| 241 | /* carryover low/fullspeed bandwidth that crosses uframe boundries */ |
| 242 | static inline void carryover_tt_bandwidth(unsigned short tt_usecs[8]) |
| 243 | { |
| 244 | int i; |
| 245 | for (i=0; i<7; i++) { |
| 246 | if (max_tt_usecs[i] < tt_usecs[i]) { |
| 247 | tt_usecs[i+1] += tt_usecs[i] - max_tt_usecs[i]; |
| 248 | tt_usecs[i] = max_tt_usecs[i]; |
| 249 | } |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | /* How many of the tt's periodic downstream 1000 usecs are allocated? |
| 254 | * |
| 255 | * While this measures the bandwidth in terms of usecs/uframe, |
| 256 | * the low/fullspeed bus has no notion of uframes, so any particular |
| 257 | * low/fullspeed transfer can "carry over" from one uframe to the next, |
| 258 | * since the TT just performs downstream transfers in sequence. |
| 259 | * |
Joe Perches | dc0d5c1 | 2007-12-17 11:40:18 -0800 | [diff] [blame] | 260 | * 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] | 261 | * and the second one would "carry over" 75 usecs into the next uframe. |
| 262 | */ |
| 263 | static void |
| 264 | periodic_tt_usecs ( |
| 265 | struct ehci_hcd *ehci, |
| 266 | struct usb_device *dev, |
| 267 | unsigned frame, |
| 268 | unsigned short tt_usecs[8] |
| 269 | ) |
| 270 | { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 271 | __hc32 *hw_p = &ehci->periodic [frame]; |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 272 | union ehci_shadow *q = &ehci->pshadow [frame]; |
| 273 | unsigned char uf; |
| 274 | |
| 275 | memset(tt_usecs, 0, 16); |
| 276 | |
| 277 | while (q->ptr) { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 278 | switch (hc32_to_cpu(ehci, Q_NEXT_TYPE(ehci, *hw_p))) { |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 279 | case Q_TYPE_ITD: |
| 280 | hw_p = &q->itd->hw_next; |
| 281 | q = &q->itd->itd_next; |
| 282 | continue; |
| 283 | case Q_TYPE_QH: |
| 284 | if (same_tt(dev, q->qh->dev)) { |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 285 | uf = tt_start_uframe(ehci, q->qh->hw->hw_info2); |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 286 | tt_usecs[uf] += q->qh->tt_usecs; |
| 287 | } |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 288 | hw_p = &q->qh->hw->hw_next; |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 289 | q = &q->qh->qh_next; |
| 290 | continue; |
| 291 | case Q_TYPE_SITD: |
| 292 | if (same_tt(dev, q->sitd->urb->dev)) { |
| 293 | uf = tt_start_uframe(ehci, q->sitd->hw_uframe); |
| 294 | tt_usecs[uf] += q->sitd->stream->tt_usecs; |
| 295 | } |
| 296 | hw_p = &q->sitd->hw_next; |
| 297 | q = &q->sitd->sitd_next; |
| 298 | continue; |
| 299 | // case Q_TYPE_FSTN: |
| 300 | default: |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 301 | ehci_dbg(ehci, "ignoring periodic frame %d FSTN\n", |
| 302 | frame); |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 303 | hw_p = &q->fstn->hw_next; |
| 304 | q = &q->fstn->fstn_next; |
| 305 | } |
| 306 | } |
| 307 | |
| 308 | carryover_tt_bandwidth(tt_usecs); |
| 309 | |
| 310 | if (max_tt_usecs[7] < tt_usecs[7]) |
| 311 | ehci_err(ehci, "frame %d tt sched overrun: %d usecs\n", |
| 312 | frame, tt_usecs[7] - max_tt_usecs[7]); |
| 313 | } |
| 314 | |
| 315 | /* |
| 316 | * Return true if the device's tt's downstream bus is available for a |
| 317 | * periodic transfer of the specified length (usecs), starting at the |
| 318 | * specified frame/uframe. Note that (as summarized in section 11.19 |
| 319 | * of the usb 2.0 spec) TTs can buffer multiple transactions for each |
| 320 | * uframe. |
| 321 | * |
| 322 | * The uframe parameter is when the fullspeed/lowspeed transfer |
| 323 | * should be executed in "B-frame" terms, which is the same as the |
| 324 | * highspeed ssplit's uframe (which is in "H-frame" terms). For example |
| 325 | * a ssplit in "H-frame" 0 causes a transfer in "B-frame" 0. |
| 326 | * See the EHCI spec sec 4.5 and fig 4.7. |
| 327 | * |
| 328 | * This checks if the full/lowspeed bus, at the specified starting uframe, |
| 329 | * has the specified bandwidth available, according to rules listed |
| 330 | * in USB 2.0 spec section 11.18.1 fig 11-60. |
| 331 | * |
| 332 | * This does not check if the transfer would exceed the max ssplit |
| 333 | * limit of 16, specified in USB 2.0 spec section 11.18.4 requirement #4, |
| 334 | * since proper scheduling limits ssplits to less than 16 per uframe. |
| 335 | */ |
| 336 | static int tt_available ( |
| 337 | struct ehci_hcd *ehci, |
| 338 | unsigned period, |
| 339 | struct usb_device *dev, |
| 340 | unsigned frame, |
| 341 | unsigned uframe, |
| 342 | u16 usecs |
| 343 | ) |
| 344 | { |
| 345 | if ((period == 0) || (uframe >= 7)) /* error */ |
| 346 | return 0; |
| 347 | |
| 348 | for (; frame < ehci->periodic_size; frame += period) { |
| 349 | unsigned short tt_usecs[8]; |
| 350 | |
| 351 | periodic_tt_usecs (ehci, dev, frame, tt_usecs); |
| 352 | |
| 353 | ehci_vdbg(ehci, "tt frame %d check %d usecs start uframe %d in" |
| 354 | " schedule %d/%d/%d/%d/%d/%d/%d/%d\n", |
| 355 | frame, usecs, uframe, |
| 356 | tt_usecs[0], tt_usecs[1], tt_usecs[2], tt_usecs[3], |
| 357 | tt_usecs[4], tt_usecs[5], tt_usecs[6], tt_usecs[7]); |
| 358 | |
| 359 | if (max_tt_usecs[uframe] <= tt_usecs[uframe]) { |
| 360 | ehci_vdbg(ehci, "frame %d uframe %d fully scheduled\n", |
| 361 | frame, uframe); |
| 362 | return 0; |
| 363 | } |
| 364 | |
| 365 | /* special case for isoc transfers larger than 125us: |
| 366 | * the first and each subsequent fully used uframe |
| 367 | * must be empty, so as to not illegally delay |
| 368 | * already scheduled transactions |
| 369 | */ |
| 370 | if (125 < usecs) { |
Dan Streetman | c065c60 | 2009-04-21 13:37:12 -0400 | [diff] [blame] | 371 | int ufs = (usecs / 125); |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 372 | int i; |
| 373 | for (i = uframe; i < (uframe + ufs) && i < 8; i++) |
| 374 | if (0 < tt_usecs[i]) { |
| 375 | ehci_vdbg(ehci, |
| 376 | "multi-uframe xfer can't fit " |
| 377 | "in frame %d uframe %d\n", |
| 378 | frame, i); |
| 379 | return 0; |
| 380 | } |
| 381 | } |
| 382 | |
| 383 | tt_usecs[uframe] += usecs; |
| 384 | |
| 385 | carryover_tt_bandwidth(tt_usecs); |
| 386 | |
| 387 | /* fail if the carryover pushed bw past the last uframe's limit */ |
| 388 | if (max_tt_usecs[7] < tt_usecs[7]) { |
| 389 | ehci_vdbg(ehci, |
| 390 | "tt unavailable usecs %d frame %d uframe %d\n", |
| 391 | usecs, frame, uframe); |
| 392 | return 0; |
| 393 | } |
| 394 | } |
| 395 | |
| 396 | return 1; |
| 397 | } |
| 398 | |
| 399 | #else |
| 400 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | /* return true iff the device's transaction translator is available |
| 402 | * for a periodic transfer starting at the specified frame, using |
| 403 | * all the uframes in the mask. |
| 404 | */ |
| 405 | static int tt_no_collision ( |
| 406 | struct ehci_hcd *ehci, |
| 407 | unsigned period, |
| 408 | struct usb_device *dev, |
| 409 | unsigned frame, |
| 410 | u32 uf_mask |
| 411 | ) |
| 412 | { |
| 413 | if (period == 0) /* error */ |
| 414 | return 0; |
| 415 | |
| 416 | /* note bandwidth wastage: split never follows csplit |
| 417 | * (different dev or endpoint) until the next uframe. |
| 418 | * calling convention doesn't make that distinction. |
| 419 | */ |
| 420 | for (; frame < ehci->periodic_size; frame += period) { |
| 421 | union ehci_shadow here; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 422 | __hc32 type; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 423 | struct ehci_qh_hw *hw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | |
| 425 | here = ehci->pshadow [frame]; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 426 | type = Q_NEXT_TYPE(ehci, ehci->periodic [frame]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | while (here.ptr) { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 428 | switch (hc32_to_cpu(ehci, type)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | case Q_TYPE_ITD: |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 430 | type = Q_NEXT_TYPE(ehci, here.itd->hw_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | here = here.itd->itd_next; |
| 432 | continue; |
| 433 | case Q_TYPE_QH: |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 434 | hw = here.qh->hw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | if (same_tt (dev, here.qh->dev)) { |
| 436 | u32 mask; |
| 437 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 438 | mask = hc32_to_cpu(ehci, |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 439 | hw->hw_info2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | /* "knows" no gap is needed */ |
| 441 | mask |= mask >> 8; |
| 442 | if (mask & uf_mask) |
| 443 | break; |
| 444 | } |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 445 | type = Q_NEXT_TYPE(ehci, hw->hw_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | here = here.qh->qh_next; |
| 447 | continue; |
| 448 | case Q_TYPE_SITD: |
| 449 | if (same_tt (dev, here.sitd->urb->dev)) { |
| 450 | u16 mask; |
| 451 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 452 | mask = hc32_to_cpu(ehci, here.sitd |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | ->hw_uframe); |
| 454 | /* FIXME assumes no gap for IN! */ |
| 455 | mask |= mask >> 8; |
| 456 | if (mask & uf_mask) |
| 457 | break; |
| 458 | } |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 459 | type = Q_NEXT_TYPE(ehci, here.sitd->hw_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | here = here.sitd->sitd_next; |
| 461 | continue; |
| 462 | // case Q_TYPE_FSTN: |
| 463 | default: |
| 464 | ehci_dbg (ehci, |
| 465 | "periodic frame %d bogus type %d\n", |
| 466 | frame, type); |
| 467 | } |
| 468 | |
| 469 | /* collision or error */ |
| 470 | return 0; |
| 471 | } |
| 472 | } |
| 473 | |
| 474 | /* no collision */ |
| 475 | return 1; |
| 476 | } |
| 477 | |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 478 | #endif /* CONFIG_USB_EHCI_TT_NEWSCHED */ |
| 479 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | /*-------------------------------------------------------------------------*/ |
| 481 | |
| 482 | static int enable_periodic (struct ehci_hcd *ehci) |
| 483 | { |
| 484 | u32 cmd; |
| 485 | int status; |
| 486 | |
David Brownell | 01c1714 | 2008-08-26 23:35:04 -0700 | [diff] [blame] | 487 | if (ehci->periodic_sched++) |
| 488 | return 0; |
| 489 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | /* did clearing PSE did take effect yet? |
| 491 | * takes effect only at frame boundaries... |
| 492 | */ |
Karsten Wiese | c765d4c | 2008-02-16 13:44:42 -0800 | [diff] [blame] | 493 | status = handshake_on_error_set_halt(ehci, &ehci->regs->status, |
| 494 | STS_PSS, 0, 9 * 125); |
Alan Stern | 69fff59 | 2011-05-17 17:27:12 -0400 | [diff] [blame] | 495 | if (status) { |
| 496 | usb_hc_died(ehci_to_hcd(ehci)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | return status; |
Alan Stern | 69fff59 | 2011-05-17 17:27:12 -0400 | [diff] [blame] | 498 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | |
Benjamin Herrenschmidt | 083522d | 2006-12-15 06:54:08 +1100 | [diff] [blame] | 500 | cmd = ehci_readl(ehci, &ehci->regs->command) | CMD_PSE; |
| 501 | ehci_writel(ehci, cmd, &ehci->regs->command); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | /* posted write ... PSS happens later */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | |
| 504 | /* make sure ehci_work scans these */ |
Alan Stern | 68aa95d | 2011-10-12 10:39:14 -0400 | [diff] [blame] | 505 | ehci->next_uframe = ehci_read_frame_index(ehci) |
Benjamin Herrenschmidt | 083522d | 2006-12-15 06:54:08 +1100 | [diff] [blame] | 506 | % (ehci->periodic_size << 3); |
Oliver Neukum | ee4ecb8 | 2009-11-27 15:17:59 +0100 | [diff] [blame] | 507 | if (unlikely(ehci->broken_periodic)) |
| 508 | ehci->last_periodic_enable = ktime_get_real(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | return 0; |
| 510 | } |
| 511 | |
| 512 | static int disable_periodic (struct ehci_hcd *ehci) |
| 513 | { |
| 514 | u32 cmd; |
| 515 | int status; |
| 516 | |
David Brownell | 01c1714 | 2008-08-26 23:35:04 -0700 | [diff] [blame] | 517 | if (--ehci->periodic_sched) |
| 518 | return 0; |
| 519 | |
Oliver Neukum | ee4ecb8 | 2009-11-27 15:17:59 +0100 | [diff] [blame] | 520 | if (unlikely(ehci->broken_periodic)) { |
| 521 | /* delay experimentally determined */ |
| 522 | ktime_t safe = ktime_add_us(ehci->last_periodic_enable, 1000); |
| 523 | ktime_t now = ktime_get_real(); |
| 524 | s64 delay = ktime_us_delta(safe, now); |
| 525 | |
| 526 | if (unlikely(delay > 0)) |
| 527 | udelay(delay); |
| 528 | } |
| 529 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | /* did setting PSE not take effect yet? |
| 531 | * takes effect only at frame boundaries... |
| 532 | */ |
Karsten Wiese | c765d4c | 2008-02-16 13:44:42 -0800 | [diff] [blame] | 533 | status = handshake_on_error_set_halt(ehci, &ehci->regs->status, |
| 534 | STS_PSS, STS_PSS, 9 * 125); |
Alan Stern | 69fff59 | 2011-05-17 17:27:12 -0400 | [diff] [blame] | 535 | if (status) { |
| 536 | usb_hc_died(ehci_to_hcd(ehci)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | return status; |
Alan Stern | 69fff59 | 2011-05-17 17:27:12 -0400 | [diff] [blame] | 538 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | |
Benjamin Herrenschmidt | 083522d | 2006-12-15 06:54:08 +1100 | [diff] [blame] | 540 | cmd = ehci_readl(ehci, &ehci->regs->command) & ~CMD_PSE; |
| 541 | ehci_writel(ehci, cmd, &ehci->regs->command); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | /* posted write ... */ |
| 543 | |
Alan Stern | 0e5f231 | 2010-04-08 16:56:37 -0400 | [diff] [blame] | 544 | free_cached_lists(ehci); |
Dmitri Epshtein | d63c66d | 2009-12-14 17:17:33 +0200 | [diff] [blame] | 545 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | ehci->next_uframe = -1; |
| 547 | return 0; |
| 548 | } |
| 549 | |
| 550 | /*-------------------------------------------------------------------------*/ |
| 551 | |
| 552 | /* periodic schedule slots have iso tds (normal or split) first, then a |
| 553 | * sparse tree for active interrupt transfers. |
| 554 | * |
| 555 | * this just links in a qh; caller guarantees uframe masks are set right. |
| 556 | * no FSTN support (yet; ehci 0.96+) |
| 557 | */ |
| 558 | static int qh_link_periodic (struct ehci_hcd *ehci, struct ehci_qh *qh) |
| 559 | { |
| 560 | unsigned i; |
| 561 | unsigned period = qh->period; |
| 562 | |
| 563 | dev_dbg (&qh->dev->dev, |
| 564 | "link qh%d-%04x/%p start %d [%d/%d us]\n", |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 565 | period, hc32_to_cpup(ehci, &qh->hw->hw_info2) |
| 566 | & (QH_CMASK | QH_SMASK), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | qh, qh->start, qh->usecs, qh->c_usecs); |
| 568 | |
| 569 | /* high bandwidth, or otherwise every microframe */ |
| 570 | if (period == 0) |
| 571 | period = 1; |
| 572 | |
| 573 | for (i = qh->start; i < ehci->periodic_size; i += period) { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 574 | union ehci_shadow *prev = &ehci->pshadow[i]; |
| 575 | __hc32 *hw_p = &ehci->periodic[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | union ehci_shadow here = *prev; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 577 | __hc32 type = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | |
| 579 | /* skip the iso nodes at list head */ |
| 580 | while (here.ptr) { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 581 | type = Q_NEXT_TYPE(ehci, *hw_p); |
| 582 | if (type == cpu_to_hc32(ehci, Q_TYPE_QH)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | break; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 584 | prev = periodic_next_shadow(ehci, prev, type); |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 585 | hw_p = shadow_next_periodic(ehci, &here, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | here = *prev; |
| 587 | } |
| 588 | |
| 589 | /* sorting each branch by period (slow-->fast) |
| 590 | * enables sharing interior tree nodes |
| 591 | */ |
| 592 | while (here.ptr && qh != here.qh) { |
| 593 | if (qh->period > here.qh->period) |
| 594 | break; |
| 595 | prev = &here.qh->qh_next; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 596 | hw_p = &here.qh->hw->hw_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | here = *prev; |
| 598 | } |
| 599 | /* link in this qh, unless some earlier pass did that */ |
| 600 | if (qh != here.qh) { |
| 601 | qh->qh_next = here; |
| 602 | if (here.qh) |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 603 | qh->hw->hw_next = *hw_p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | wmb (); |
| 605 | prev->qh = qh; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 606 | *hw_p = QH_NEXT (ehci, qh->qh_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | } |
| 608 | } |
| 609 | qh->qh_state = QH_STATE_LINKED; |
Alan Stern | ef4638f | 2009-07-31 10:41:40 -0400 | [diff] [blame] | 610 | qh->xacterrs = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | qh_get (qh); |
| 612 | |
| 613 | /* update per-qh bandwidth for usbfs */ |
| 614 | ehci_to_hcd(ehci)->self.bandwidth_allocated += qh->period |
| 615 | ? ((qh->usecs + qh->c_usecs) / qh->period) |
| 616 | : (qh->usecs * 8); |
| 617 | |
| 618 | /* maybe enable periodic schedule processing */ |
David Brownell | 01c1714 | 2008-08-26 23:35:04 -0700 | [diff] [blame] | 619 | return enable_periodic(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | } |
| 621 | |
David Brownell | 01c1714 | 2008-08-26 23:35:04 -0700 | [diff] [blame] | 622 | 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] | 623 | { |
| 624 | unsigned i; |
| 625 | unsigned period; |
| 626 | |
| 627 | // FIXME: |
| 628 | // IF this isn't high speed |
| 629 | // and this qh is active in the current uframe |
| 630 | // (and overlay token SplitXstate is false?) |
| 631 | // THEN |
Harvey Harrison | 551509d | 2009-02-11 14:11:36 -0800 | [diff] [blame] | 632 | // qh->hw_info1 |= cpu_to_hc32(1 << 7 /* "ignore" */); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | |
| 634 | /* high bandwidth, or otherwise part of every microframe */ |
| 635 | if ((period = qh->period) == 0) |
| 636 | period = 1; |
| 637 | |
| 638 | for (i = qh->start; i < ehci->periodic_size; i += period) |
| 639 | periodic_unlink (ehci, i, qh); |
| 640 | |
| 641 | /* update per-qh bandwidth for usbfs */ |
| 642 | ehci_to_hcd(ehci)->self.bandwidth_allocated -= qh->period |
| 643 | ? ((qh->usecs + qh->c_usecs) / qh->period) |
| 644 | : (qh->usecs * 8); |
| 645 | |
| 646 | dev_dbg (&qh->dev->dev, |
| 647 | "unlink qh%d-%04x/%p start %d [%d/%d us]\n", |
David Brownell | 7dedacf | 2005-08-04 18:06:41 -0700 | [diff] [blame] | 648 | qh->period, |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 649 | hc32_to_cpup(ehci, &qh->hw->hw_info2) & (QH_CMASK | QH_SMASK), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | qh, qh->start, qh->usecs, qh->c_usecs); |
| 651 | |
| 652 | /* qh->qh_next still "live" to HC */ |
| 653 | qh->qh_state = QH_STATE_UNLINK; |
| 654 | qh->qh_next.ptr = NULL; |
| 655 | qh_put (qh); |
| 656 | |
| 657 | /* maybe turn off periodic schedule */ |
David Brownell | 01c1714 | 2008-08-26 23:35:04 -0700 | [diff] [blame] | 658 | return disable_periodic(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | } |
| 660 | |
| 661 | static void intr_deschedule (struct ehci_hcd *ehci, struct ehci_qh *qh) |
| 662 | { |
Alan Stern | a448c9d | 2009-08-19 12:22:44 -0400 | [diff] [blame] | 663 | unsigned wait; |
| 664 | struct ehci_qh_hw *hw = qh->hw; |
| 665 | int rc; |
| 666 | |
| 667 | /* If the QH isn't linked then there's nothing we can do |
| 668 | * unless we were called during a giveback, in which case |
| 669 | * qh_completions() has to deal with it. |
| 670 | */ |
| 671 | if (qh->qh_state != QH_STATE_LINKED) { |
| 672 | if (qh->qh_state == QH_STATE_COMPLETING) |
| 673 | qh->needs_rescan = 1; |
| 674 | return; |
| 675 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | |
| 677 | qh_unlink_periodic (ehci, qh); |
| 678 | |
| 679 | /* simple/paranoid: always delay, expecting the HC needs to read |
| 680 | * qh->hw_next or finish a writeback after SPLIT/CSPLIT ... and |
| 681 | * expect khubd to clean up after any CSPLITs we won't issue. |
| 682 | * active high speed queues may need bigger delays... |
| 683 | */ |
| 684 | if (list_empty (&qh->qtd_list) |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 685 | || (cpu_to_hc32(ehci, QH_CMASK) |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 686 | & hw->hw_info2) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | wait = 2; |
| 688 | else |
| 689 | wait = 55; /* worst case: 3 * 1024 */ |
| 690 | |
| 691 | udelay (wait); |
| 692 | qh->qh_state = QH_STATE_IDLE; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 693 | hw->hw_next = EHCI_LIST_END(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | wmb (); |
Alan Stern | a448c9d | 2009-08-19 12:22:44 -0400 | [diff] [blame] | 695 | |
| 696 | qh_completions(ehci, qh); |
| 697 | |
| 698 | /* reschedule QH iff another request is queued */ |
| 699 | if (!list_empty(&qh->qtd_list) && |
Alan Stern | e879990 | 2011-08-18 16:31:30 -0400 | [diff] [blame] | 700 | ehci->rh_state == EHCI_RH_RUNNING) { |
Alan Stern | a448c9d | 2009-08-19 12:22:44 -0400 | [diff] [blame] | 701 | rc = qh_schedule(ehci, qh); |
| 702 | |
| 703 | /* An error here likely indicates handshake failure |
| 704 | * or no space left in the schedule. Neither fault |
| 705 | * should happen often ... |
| 706 | * |
| 707 | * FIXME kill the now-dysfunctional queued urbs |
| 708 | */ |
| 709 | if (rc != 0) |
| 710 | ehci_err(ehci, "can't reschedule qh %p, err %d\n", |
| 711 | qh, rc); |
| 712 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | } |
| 714 | |
| 715 | /*-------------------------------------------------------------------------*/ |
| 716 | |
| 717 | static int check_period ( |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 718 | struct ehci_hcd *ehci, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | unsigned frame, |
| 720 | unsigned uframe, |
| 721 | unsigned period, |
| 722 | unsigned usecs |
| 723 | ) { |
| 724 | int claimed; |
| 725 | |
| 726 | /* complete split running into next frame? |
| 727 | * given FSTN support, we could sometimes check... |
| 728 | */ |
| 729 | if (uframe >= 8) |
| 730 | return 0; |
| 731 | |
Kirill Smelkov | cc62a7e | 2011-07-03 20:36:57 +0400 | [diff] [blame] | 732 | /* convert "usecs we need" to "max already claimed" */ |
| 733 | usecs = ehci->uframe_periodic_max - usecs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | |
| 735 | /* we "know" 2 and 4 uframe intervals were rejected; so |
| 736 | * for period 0, check _every_ microframe in the schedule. |
| 737 | */ |
| 738 | if (unlikely (period == 0)) { |
| 739 | do { |
| 740 | for (uframe = 0; uframe < 7; uframe++) { |
| 741 | claimed = periodic_usecs (ehci, frame, uframe); |
| 742 | if (claimed > usecs) |
| 743 | return 0; |
| 744 | } |
| 745 | } while ((frame += 1) < ehci->periodic_size); |
| 746 | |
| 747 | /* just check the specified uframe, at that period */ |
| 748 | } else { |
| 749 | do { |
| 750 | claimed = periodic_usecs (ehci, frame, uframe); |
| 751 | if (claimed > usecs) |
| 752 | return 0; |
| 753 | } while ((frame += period) < ehci->periodic_size); |
| 754 | } |
| 755 | |
| 756 | // success! |
| 757 | return 1; |
| 758 | } |
| 759 | |
| 760 | static int check_intr_schedule ( |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 761 | struct ehci_hcd *ehci, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | unsigned frame, |
| 763 | unsigned uframe, |
| 764 | const struct ehci_qh *qh, |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 765 | __hc32 *c_maskp |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | ) |
| 767 | { |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 768 | int retval = -ENOSPC; |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 769 | u8 mask = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | |
| 771 | if (qh->c_usecs && uframe >= 6) /* FSTN territory? */ |
| 772 | goto done; |
| 773 | |
| 774 | if (!check_period (ehci, frame, uframe, qh->period, qh->usecs)) |
| 775 | goto done; |
| 776 | if (!qh->c_usecs) { |
| 777 | retval = 0; |
| 778 | *c_maskp = 0; |
| 779 | goto done; |
| 780 | } |
| 781 | |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 782 | #ifdef CONFIG_USB_EHCI_TT_NEWSCHED |
| 783 | if (tt_available (ehci, qh->period, qh->dev, frame, uframe, |
| 784 | qh->tt_usecs)) { |
| 785 | unsigned i; |
| 786 | |
| 787 | /* TODO : this may need FSTN for SSPLIT in uframe 5. */ |
| 788 | for (i=uframe+1; i<8 && i<uframe+4; i++) |
| 789 | if (!check_period (ehci, frame, i, |
| 790 | qh->period, qh->c_usecs)) |
| 791 | goto done; |
| 792 | else |
| 793 | mask |= 1 << i; |
| 794 | |
| 795 | retval = 0; |
| 796 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 797 | *c_maskp = cpu_to_hc32(ehci, mask << 8); |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 798 | } |
| 799 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | /* Make sure this tt's buffer is also available for CSPLITs. |
| 801 | * We pessimize a bit; probably the typical full speed case |
| 802 | * doesn't need the second CSPLIT. |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 803 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | * NOTE: both SPLIT and CSPLIT could be checked in just |
| 805 | * one smart pass... |
| 806 | */ |
| 807 | mask = 0x03 << (uframe + qh->gap_uf); |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 808 | *c_maskp = cpu_to_hc32(ehci, mask << 8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | |
| 810 | mask |= 1 << uframe; |
| 811 | if (tt_no_collision (ehci, qh->period, qh->dev, frame, mask)) { |
| 812 | if (!check_period (ehci, frame, uframe + qh->gap_uf + 1, |
| 813 | qh->period, qh->c_usecs)) |
| 814 | goto done; |
| 815 | if (!check_period (ehci, frame, uframe + qh->gap_uf, |
| 816 | qh->period, qh->c_usecs)) |
| 817 | goto done; |
| 818 | retval = 0; |
| 819 | } |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 820 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | done: |
| 822 | return retval; |
| 823 | } |
| 824 | |
| 825 | /* "first fit" scheduling policy used the first time through, |
| 826 | * or when the previous schedule slot can't be re-used. |
| 827 | */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 828 | static int qh_schedule(struct ehci_hcd *ehci, struct ehci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | { |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 830 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | unsigned uframe; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 832 | __hc32 c_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | unsigned frame; /* 0..(qh->period - 1), or NO_FRAME */ |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 834 | struct ehci_qh_hw *hw = qh->hw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | |
| 836 | qh_refresh(ehci, qh); |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 837 | hw->hw_next = EHCI_LIST_END(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | frame = qh->start; |
| 839 | |
| 840 | /* reuse the previous schedule slots, if we can */ |
| 841 | if (frame < qh->period) { |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 842 | uframe = ffs(hc32_to_cpup(ehci, &hw->hw_info2) & QH_SMASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | status = check_intr_schedule (ehci, frame, --uframe, |
| 844 | qh, &c_mask); |
| 845 | } else { |
| 846 | uframe = 0; |
| 847 | c_mask = 0; |
| 848 | status = -ENOSPC; |
| 849 | } |
| 850 | |
| 851 | /* else scan the schedule to find a group of slots such that all |
| 852 | * uframes have enough periodic bandwidth available. |
| 853 | */ |
| 854 | if (status) { |
| 855 | /* "normal" case, uframing flexible except with splits */ |
| 856 | if (qh->period) { |
Alan Stern | 68335e8 | 2009-05-22 17:02:33 -0400 | [diff] [blame] | 857 | int i; |
| 858 | |
| 859 | for (i = qh->period; status && i > 0; --i) { |
| 860 | frame = ++ehci->random_frame % qh->period; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | for (uframe = 0; uframe < 8; uframe++) { |
| 862 | status = check_intr_schedule (ehci, |
| 863 | frame, uframe, qh, |
| 864 | &c_mask); |
| 865 | if (status == 0) |
| 866 | break; |
| 867 | } |
Alan Stern | 68335e8 | 2009-05-22 17:02:33 -0400 | [diff] [blame] | 868 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | |
| 870 | /* qh->period == 0 means every uframe */ |
| 871 | } else { |
| 872 | frame = 0; |
| 873 | status = check_intr_schedule (ehci, 0, 0, qh, &c_mask); |
| 874 | } |
| 875 | if (status) |
| 876 | goto done; |
| 877 | qh->start = frame; |
| 878 | |
| 879 | /* reset S-frame and (maybe) C-frame masks */ |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 880 | hw->hw_info2 &= cpu_to_hc32(ehci, ~(QH_CMASK | QH_SMASK)); |
| 881 | hw->hw_info2 |= qh->period |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 882 | ? cpu_to_hc32(ehci, 1 << uframe) |
| 883 | : cpu_to_hc32(ehci, QH_SMASK); |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 884 | hw->hw_info2 |= c_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | } else |
| 886 | ehci_dbg (ehci, "reused qh %p schedule\n", qh); |
| 887 | |
| 888 | /* stuff into the periodic schedule */ |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 889 | status = qh_link_periodic (ehci, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | done: |
| 891 | return status; |
| 892 | } |
| 893 | |
| 894 | static int intr_submit ( |
| 895 | struct ehci_hcd *ehci, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | struct urb *urb, |
| 897 | struct list_head *qtd_list, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 898 | gfp_t mem_flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | ) { |
| 900 | unsigned epnum; |
| 901 | unsigned long flags; |
| 902 | struct ehci_qh *qh; |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 903 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | struct list_head empty; |
| 905 | |
| 906 | /* get endpoint and transfer/schedule data */ |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 907 | epnum = urb->ep->desc.bEndpointAddress; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | |
| 909 | spin_lock_irqsave (&ehci->lock, flags); |
| 910 | |
Alan Stern | 541c7d4 | 2010-06-22 16:39:10 -0400 | [diff] [blame] | 911 | if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) { |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 912 | status = -ESHUTDOWN; |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 913 | goto done_not_linked; |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 914 | } |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 915 | status = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb); |
| 916 | if (unlikely(status)) |
| 917 | goto done_not_linked; |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 918 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | /* get qh and force any scheduling errors */ |
| 920 | INIT_LIST_HEAD (&empty); |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 921 | qh = qh_append_tds(ehci, urb, &empty, epnum, &urb->ep->hcpriv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | if (qh == NULL) { |
| 923 | status = -ENOMEM; |
| 924 | goto done; |
| 925 | } |
| 926 | if (qh->qh_state == QH_STATE_IDLE) { |
| 927 | if ((status = qh_schedule (ehci, qh)) != 0) |
| 928 | goto done; |
| 929 | } |
| 930 | |
| 931 | /* then queue the urb's tds to the qh */ |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 932 | qh = qh_append_tds(ehci, urb, qtd_list, epnum, &urb->ep->hcpriv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | BUG_ON (qh == NULL); |
| 934 | |
| 935 | /* ... update usbfs periodic stats */ |
| 936 | ehci_to_hcd(ehci)->self.bandwidth_int_reqs++; |
| 937 | |
| 938 | done: |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 939 | if (unlikely(status)) |
| 940 | usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb); |
| 941 | done_not_linked: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | spin_unlock_irqrestore (&ehci->lock, flags); |
| 943 | if (status) |
| 944 | qtd_list_free (ehci, urb, qtd_list); |
| 945 | |
| 946 | return status; |
| 947 | } |
| 948 | |
| 949 | /*-------------------------------------------------------------------------*/ |
| 950 | |
| 951 | /* ehci_iso_stream ops work with both ITD and SITD */ |
| 952 | |
| 953 | static struct ehci_iso_stream * |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 954 | iso_stream_alloc (gfp_t mem_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | { |
| 956 | struct ehci_iso_stream *stream; |
| 957 | |
Pekka Enberg | 7b842b6 | 2005-09-06 15:18:34 -0700 | [diff] [blame] | 958 | stream = kzalloc(sizeof *stream, mem_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | if (likely (stream != NULL)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | INIT_LIST_HEAD(&stream->td_list); |
| 961 | INIT_LIST_HEAD(&stream->free_list); |
| 962 | stream->next_uframe = -1; |
| 963 | stream->refcount = 1; |
| 964 | } |
| 965 | return stream; |
| 966 | } |
| 967 | |
| 968 | static void |
| 969 | iso_stream_init ( |
| 970 | struct ehci_hcd *ehci, |
| 971 | struct ehci_iso_stream *stream, |
| 972 | struct usb_device *dev, |
| 973 | int pipe, |
| 974 | unsigned interval |
| 975 | ) |
| 976 | { |
| 977 | static const u8 smask_out [] = { 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f }; |
| 978 | |
| 979 | u32 buf1; |
| 980 | unsigned epnum, maxp; |
| 981 | int is_input; |
| 982 | long bandwidth; |
| 983 | |
| 984 | /* |
| 985 | * this might be a "high bandwidth" highspeed endpoint, |
| 986 | * as encoded in the ep descriptor's wMaxPacket field |
| 987 | */ |
| 988 | epnum = usb_pipeendpoint (pipe); |
| 989 | is_input = usb_pipein (pipe) ? USB_DIR_IN : 0; |
| 990 | maxp = usb_maxpacket(dev, pipe, !is_input); |
| 991 | if (is_input) { |
| 992 | buf1 = (1 << 11); |
| 993 | } else { |
| 994 | buf1 = 0; |
| 995 | } |
| 996 | |
| 997 | /* knows about ITD vs SITD */ |
| 998 | if (dev->speed == USB_SPEED_HIGH) { |
| 999 | unsigned multi = hb_mult(maxp); |
| 1000 | |
| 1001 | stream->highspeed = 1; |
| 1002 | |
| 1003 | maxp = max_packet(maxp); |
| 1004 | buf1 |= maxp; |
| 1005 | maxp *= multi; |
| 1006 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1007 | stream->buf0 = cpu_to_hc32(ehci, (epnum << 8) | dev->devnum); |
| 1008 | stream->buf1 = cpu_to_hc32(ehci, buf1); |
| 1009 | stream->buf2 = cpu_to_hc32(ehci, multi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | |
| 1011 | /* usbfs wants to report the average usecs per frame tied up |
| 1012 | * when transfers on this endpoint are scheduled ... |
| 1013 | */ |
| 1014 | stream->usecs = HS_USECS_ISO (maxp); |
| 1015 | bandwidth = stream->usecs * 8; |
Alan Stern | 372dd6e | 2008-11-12 17:02:57 -0500 | [diff] [blame] | 1016 | bandwidth /= interval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | |
| 1018 | } else { |
| 1019 | u32 addr; |
david-b@pacbell.net | d038420 | 2005-08-13 18:44:58 -0700 | [diff] [blame] | 1020 | int think_time; |
Clemens Ladisch | 469d022 | 2006-01-20 13:49:10 -0800 | [diff] [blame] | 1021 | int hs_transfers; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | |
| 1023 | addr = dev->ttport << 24; |
| 1024 | if (!ehci_is_TDI(ehci) |
| 1025 | || (dev->tt->hub != |
| 1026 | ehci_to_hcd(ehci)->self.root_hub)) |
| 1027 | addr |= dev->tt->hub->devnum << 16; |
| 1028 | addr |= epnum << 8; |
| 1029 | addr |= dev->devnum; |
| 1030 | stream->usecs = HS_USECS_ISO (maxp); |
david-b@pacbell.net | d038420 | 2005-08-13 18:44:58 -0700 | [diff] [blame] | 1031 | think_time = dev->tt ? dev->tt->think_time : 0; |
| 1032 | stream->tt_usecs = NS_TO_US (think_time + usb_calc_bus_time ( |
| 1033 | dev->speed, is_input, 1, maxp)); |
Clemens Ladisch | 469d022 | 2006-01-20 13:49:10 -0800 | [diff] [blame] | 1034 | hs_transfers = max (1u, (maxp + 187) / 188); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | if (is_input) { |
| 1036 | u32 tmp; |
| 1037 | |
| 1038 | addr |= 1 << 31; |
| 1039 | stream->c_usecs = stream->usecs; |
| 1040 | stream->usecs = HS_USECS_ISO (1); |
| 1041 | stream->raw_mask = 1; |
| 1042 | |
Clemens Ladisch | 469d022 | 2006-01-20 13:49:10 -0800 | [diff] [blame] | 1043 | /* c-mask as specified in USB 2.0 11.18.4 3.c */ |
| 1044 | tmp = (1 << (hs_transfers + 2)) - 1; |
| 1045 | stream->raw_mask |= tmp << (8 + 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | } else |
Clemens Ladisch | 469d022 | 2006-01-20 13:49:10 -0800 | [diff] [blame] | 1047 | stream->raw_mask = smask_out [hs_transfers - 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | bandwidth = stream->usecs + stream->c_usecs; |
Alan Stern | 372dd6e | 2008-11-12 17:02:57 -0500 | [diff] [blame] | 1049 | bandwidth /= interval << 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | |
| 1051 | /* stream->splits gets created from raw_mask later */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1052 | stream->address = cpu_to_hc32(ehci, addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | } |
| 1054 | stream->bandwidth = bandwidth; |
| 1055 | |
| 1056 | stream->udev = dev; |
| 1057 | |
| 1058 | stream->bEndpointAddress = is_input | epnum; |
| 1059 | stream->interval = interval; |
| 1060 | stream->maxp = maxp; |
| 1061 | } |
| 1062 | |
| 1063 | static void |
| 1064 | iso_stream_put(struct ehci_hcd *ehci, struct ehci_iso_stream *stream) |
| 1065 | { |
| 1066 | stream->refcount--; |
| 1067 | |
| 1068 | /* free whenever just a dev->ep reference remains. |
| 1069 | * not like a QH -- no persistent state (toggle, halt) |
| 1070 | */ |
| 1071 | if (stream->refcount == 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | // BUG_ON (!list_empty(&stream->td_list)); |
| 1073 | |
| 1074 | while (!list_empty (&stream->free_list)) { |
| 1075 | struct list_head *entry; |
| 1076 | |
| 1077 | entry = stream->free_list.next; |
| 1078 | list_del (entry); |
| 1079 | |
| 1080 | /* knows about ITD vs SITD */ |
| 1081 | if (stream->highspeed) { |
| 1082 | struct ehci_itd *itd; |
| 1083 | |
| 1084 | itd = list_entry (entry, struct ehci_itd, |
| 1085 | itd_list); |
| 1086 | dma_pool_free (ehci->itd_pool, itd, |
| 1087 | itd->itd_dma); |
| 1088 | } else { |
| 1089 | struct ehci_sitd *sitd; |
| 1090 | |
| 1091 | sitd = list_entry (entry, struct ehci_sitd, |
| 1092 | sitd_list); |
| 1093 | dma_pool_free (ehci->sitd_pool, sitd, |
| 1094 | sitd->sitd_dma); |
| 1095 | } |
| 1096 | } |
| 1097 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | stream->bEndpointAddress &= 0x0f; |
Karsten Wiese | 9aa09d2 | 2009-02-08 16:07:58 -0800 | [diff] [blame] | 1099 | if (stream->ep) |
| 1100 | stream->ep->hcpriv = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | kfree(stream); |
| 1103 | } |
| 1104 | } |
| 1105 | |
| 1106 | static inline struct ehci_iso_stream * |
| 1107 | iso_stream_get (struct ehci_iso_stream *stream) |
| 1108 | { |
| 1109 | if (likely (stream != NULL)) |
| 1110 | stream->refcount++; |
| 1111 | return stream; |
| 1112 | } |
| 1113 | |
| 1114 | static struct ehci_iso_stream * |
| 1115 | iso_stream_find (struct ehci_hcd *ehci, struct urb *urb) |
| 1116 | { |
| 1117 | unsigned epnum; |
| 1118 | struct ehci_iso_stream *stream; |
| 1119 | struct usb_host_endpoint *ep; |
| 1120 | unsigned long flags; |
| 1121 | |
| 1122 | epnum = usb_pipeendpoint (urb->pipe); |
| 1123 | if (usb_pipein(urb->pipe)) |
| 1124 | ep = urb->dev->ep_in[epnum]; |
| 1125 | else |
| 1126 | ep = urb->dev->ep_out[epnum]; |
| 1127 | |
| 1128 | spin_lock_irqsave (&ehci->lock, flags); |
| 1129 | stream = ep->hcpriv; |
| 1130 | |
| 1131 | if (unlikely (stream == NULL)) { |
| 1132 | stream = iso_stream_alloc(GFP_ATOMIC); |
| 1133 | if (likely (stream != NULL)) { |
| 1134 | /* dev->ep owns the initial refcount */ |
| 1135 | ep->hcpriv = stream; |
| 1136 | stream->ep = ep; |
| 1137 | iso_stream_init(ehci, stream, urb->dev, urb->pipe, |
| 1138 | urb->interval); |
| 1139 | } |
| 1140 | |
Clemens Ladisch | 1082f57 | 2010-03-01 17:18:56 +0100 | [diff] [blame] | 1141 | /* if dev->ep [epnum] is a QH, hw is set */ |
| 1142 | } else if (unlikely (stream->hw != NULL)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | ehci_dbg (ehci, "dev %s ep%d%s, not iso??\n", |
| 1144 | urb->dev->devpath, epnum, |
| 1145 | usb_pipein(urb->pipe) ? "in" : "out"); |
| 1146 | stream = NULL; |
| 1147 | } |
| 1148 | |
| 1149 | /* caller guarantees an eventual matching iso_stream_put */ |
| 1150 | stream = iso_stream_get (stream); |
| 1151 | |
| 1152 | spin_unlock_irqrestore (&ehci->lock, flags); |
| 1153 | return stream; |
| 1154 | } |
| 1155 | |
| 1156 | /*-------------------------------------------------------------------------*/ |
| 1157 | |
| 1158 | /* ehci_iso_sched ops can be ITD-only or SITD-only */ |
| 1159 | |
| 1160 | static struct ehci_iso_sched * |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 1161 | iso_sched_alloc (unsigned packets, gfp_t mem_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | { |
| 1163 | struct ehci_iso_sched *iso_sched; |
| 1164 | int size = sizeof *iso_sched; |
| 1165 | |
| 1166 | size += packets * sizeof (struct ehci_iso_packet); |
Eric Sesterhenn | 80b6ca4 | 2006-02-27 21:29:43 +0100 | [diff] [blame] | 1167 | iso_sched = kzalloc(size, mem_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | if (likely (iso_sched != NULL)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | INIT_LIST_HEAD (&iso_sched->td_list); |
| 1170 | } |
| 1171 | return iso_sched; |
| 1172 | } |
| 1173 | |
| 1174 | static inline void |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1175 | itd_sched_init( |
| 1176 | struct ehci_hcd *ehci, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | struct ehci_iso_sched *iso_sched, |
| 1178 | struct ehci_iso_stream *stream, |
| 1179 | struct urb *urb |
| 1180 | ) |
| 1181 | { |
| 1182 | unsigned i; |
| 1183 | dma_addr_t dma = urb->transfer_dma; |
| 1184 | |
| 1185 | /* how many uframes are needed for these transfers */ |
| 1186 | iso_sched->span = urb->number_of_packets * stream->interval; |
| 1187 | |
| 1188 | /* figure out per-uframe itd fields that we'll need later |
| 1189 | * when we fit new itds into the schedule. |
| 1190 | */ |
| 1191 | for (i = 0; i < urb->number_of_packets; i++) { |
| 1192 | struct ehci_iso_packet *uframe = &iso_sched->packet [i]; |
| 1193 | unsigned length; |
| 1194 | dma_addr_t buf; |
| 1195 | u32 trans; |
| 1196 | |
| 1197 | length = urb->iso_frame_desc [i].length; |
| 1198 | buf = dma + urb->iso_frame_desc [i].offset; |
| 1199 | |
| 1200 | trans = EHCI_ISOC_ACTIVE; |
| 1201 | trans |= buf & 0x0fff; |
| 1202 | if (unlikely (((i + 1) == urb->number_of_packets)) |
| 1203 | && !(urb->transfer_flags & URB_NO_INTERRUPT)) |
| 1204 | trans |= EHCI_ITD_IOC; |
| 1205 | trans |= length << 16; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1206 | uframe->transaction = cpu_to_hc32(ehci, trans); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | |
David Brownell | 7707857 | 2005-05-28 10:46:18 -0700 | [diff] [blame] | 1208 | /* might need to cross a buffer page within a uframe */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | uframe->bufp = (buf & ~(u64)0x0fff); |
| 1210 | buf += length; |
| 1211 | if (unlikely ((uframe->bufp != (buf & ~(u64)0x0fff)))) |
| 1212 | uframe->cross = 1; |
| 1213 | } |
| 1214 | } |
| 1215 | |
| 1216 | static void |
| 1217 | iso_sched_free ( |
| 1218 | struct ehci_iso_stream *stream, |
| 1219 | struct ehci_iso_sched *iso_sched |
| 1220 | ) |
| 1221 | { |
| 1222 | if (!iso_sched) |
| 1223 | return; |
| 1224 | // caller must hold ehci->lock! |
| 1225 | list_splice (&iso_sched->td_list, &stream->free_list); |
| 1226 | kfree (iso_sched); |
| 1227 | } |
| 1228 | |
| 1229 | static int |
| 1230 | itd_urb_transaction ( |
| 1231 | struct ehci_iso_stream *stream, |
| 1232 | struct ehci_hcd *ehci, |
| 1233 | struct urb *urb, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 1234 | gfp_t mem_flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | ) |
| 1236 | { |
| 1237 | struct ehci_itd *itd; |
| 1238 | dma_addr_t itd_dma; |
| 1239 | int i; |
| 1240 | unsigned num_itds; |
| 1241 | struct ehci_iso_sched *sched; |
| 1242 | unsigned long flags; |
| 1243 | |
| 1244 | sched = iso_sched_alloc (urb->number_of_packets, mem_flags); |
| 1245 | if (unlikely (sched == NULL)) |
| 1246 | return -ENOMEM; |
| 1247 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1248 | itd_sched_init(ehci, sched, stream, urb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | |
| 1250 | if (urb->interval < 8) |
| 1251 | num_itds = 1 + (sched->span + 7) / 8; |
| 1252 | else |
| 1253 | num_itds = urb->number_of_packets; |
| 1254 | |
| 1255 | /* allocate/init ITDs */ |
| 1256 | spin_lock_irqsave (&ehci->lock, flags); |
| 1257 | for (i = 0; i < num_itds; i++) { |
| 1258 | |
| 1259 | /* free_list.next might be cache-hot ... but maybe |
| 1260 | * the HC caches it too. avoid that issue for now. |
| 1261 | */ |
| 1262 | |
| 1263 | /* prefer previously-allocated itds */ |
| 1264 | if (likely (!list_empty(&stream->free_list))) { |
| 1265 | itd = list_entry (stream->free_list.prev, |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1266 | struct ehci_itd, itd_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | list_del (&itd->itd_list); |
| 1268 | itd_dma = itd->itd_dma; |
Karsten Wiese | 3d01f0f | 2008-02-19 12:31:49 -0800 | [diff] [blame] | 1269 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | spin_unlock_irqrestore (&ehci->lock, flags); |
| 1271 | itd = dma_pool_alloc (ehci->itd_pool, mem_flags, |
| 1272 | &itd_dma); |
| 1273 | spin_lock_irqsave (&ehci->lock, flags); |
Karsten Wiese | 3d01f0f | 2008-02-19 12:31:49 -0800 | [diff] [blame] | 1274 | if (!itd) { |
| 1275 | iso_sched_free(stream, sched); |
| 1276 | spin_unlock_irqrestore(&ehci->lock, flags); |
| 1277 | return -ENOMEM; |
| 1278 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | } |
| 1280 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | memset (itd, 0, sizeof *itd); |
| 1282 | itd->itd_dma = itd_dma; |
| 1283 | list_add (&itd->itd_list, &sched->td_list); |
| 1284 | } |
| 1285 | spin_unlock_irqrestore (&ehci->lock, flags); |
| 1286 | |
| 1287 | /* temporarily store schedule info in hcpriv */ |
| 1288 | urb->hcpriv = sched; |
| 1289 | urb->error_count = 0; |
| 1290 | return 0; |
| 1291 | } |
| 1292 | |
| 1293 | /*-------------------------------------------------------------------------*/ |
| 1294 | |
| 1295 | static inline int |
| 1296 | itd_slot_ok ( |
| 1297 | struct ehci_hcd *ehci, |
| 1298 | u32 mod, |
| 1299 | u32 uframe, |
| 1300 | u8 usecs, |
| 1301 | u32 period |
| 1302 | ) |
| 1303 | { |
| 1304 | uframe %= period; |
| 1305 | do { |
Kirill Smelkov | cc62a7e | 2011-07-03 20:36:57 +0400 | [diff] [blame] | 1306 | /* can't commit more than uframe_periodic_max usec */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | if (periodic_usecs (ehci, uframe >> 3, uframe & 0x7) |
Kirill Smelkov | cc62a7e | 2011-07-03 20:36:57 +0400 | [diff] [blame] | 1308 | > (ehci->uframe_periodic_max - usecs)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | return 0; |
| 1310 | |
| 1311 | /* we know urb->interval is 2^N uframes */ |
| 1312 | uframe += period; |
| 1313 | } while (uframe < mod); |
| 1314 | return 1; |
| 1315 | } |
| 1316 | |
| 1317 | static inline int |
| 1318 | sitd_slot_ok ( |
| 1319 | struct ehci_hcd *ehci, |
| 1320 | u32 mod, |
| 1321 | struct ehci_iso_stream *stream, |
| 1322 | u32 uframe, |
| 1323 | struct ehci_iso_sched *sched, |
| 1324 | u32 period_uframes |
| 1325 | ) |
| 1326 | { |
| 1327 | u32 mask, tmp; |
| 1328 | u32 frame, uf; |
| 1329 | |
| 1330 | mask = stream->raw_mask << (uframe & 7); |
| 1331 | |
| 1332 | /* for IN, don't wrap CSPLIT into the next frame */ |
| 1333 | if (mask & ~0xffff) |
| 1334 | return 0; |
| 1335 | |
| 1336 | /* this multi-pass logic is simple, but performance may |
| 1337 | * suffer when the schedule data isn't cached. |
| 1338 | */ |
| 1339 | |
| 1340 | /* check bandwidth */ |
| 1341 | uframe %= period_uframes; |
| 1342 | do { |
| 1343 | u32 max_used; |
| 1344 | |
| 1345 | frame = uframe >> 3; |
| 1346 | uf = uframe & 7; |
| 1347 | |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 1348 | #ifdef CONFIG_USB_EHCI_TT_NEWSCHED |
| 1349 | /* The tt's fullspeed bus bandwidth must be available. |
| 1350 | * tt_available scheduling guarantees 10+% for control/bulk. |
| 1351 | */ |
| 1352 | if (!tt_available (ehci, period_uframes << 3, |
| 1353 | stream->udev, frame, uf, stream->tt_usecs)) |
| 1354 | return 0; |
| 1355 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | /* tt must be idle for start(s), any gap, and csplit. |
| 1357 | * assume scheduling slop leaves 10+% for control/bulk. |
| 1358 | */ |
| 1359 | if (!tt_no_collision (ehci, period_uframes << 3, |
| 1360 | stream->udev, frame, mask)) |
| 1361 | return 0; |
Dan Streetman | ba47f66 | 2006-05-24 09:39:16 -0700 | [diff] [blame] | 1362 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | |
| 1364 | /* check starts (OUT uses more than one) */ |
Kirill Smelkov | cc62a7e | 2011-07-03 20:36:57 +0400 | [diff] [blame] | 1365 | max_used = ehci->uframe_periodic_max - stream->usecs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | for (tmp = stream->raw_mask & 0xff; tmp; tmp >>= 1, uf++) { |
| 1367 | if (periodic_usecs (ehci, frame, uf) > max_used) |
| 1368 | return 0; |
| 1369 | } |
| 1370 | |
| 1371 | /* for IN, check CSPLIT */ |
| 1372 | if (stream->c_usecs) { |
Clemens Ladisch | 0c73462 | 2006-01-22 10:32:49 -0800 | [diff] [blame] | 1373 | uf = uframe & 7; |
Kirill Smelkov | cc62a7e | 2011-07-03 20:36:57 +0400 | [diff] [blame] | 1374 | max_used = ehci->uframe_periodic_max - stream->c_usecs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | do { |
| 1376 | tmp = 1 << uf; |
| 1377 | tmp <<= 8; |
| 1378 | if ((stream->raw_mask & tmp) == 0) |
| 1379 | continue; |
| 1380 | if (periodic_usecs (ehci, frame, uf) |
| 1381 | > max_used) |
| 1382 | return 0; |
| 1383 | } while (++uf < 8); |
| 1384 | } |
| 1385 | |
| 1386 | /* we know urb->interval is 2^N uframes */ |
| 1387 | uframe += period_uframes; |
| 1388 | } while (uframe < mod); |
| 1389 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1390 | stream->splits = cpu_to_hc32(ehci, stream->raw_mask << (uframe & 7)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | return 1; |
| 1392 | } |
| 1393 | |
| 1394 | /* |
| 1395 | * This scheduler plans almost as far into the future as it has actual |
| 1396 | * periodic schedule slots. (Affected by TUNE_FLS, which defaults to |
| 1397 | * "as small as possible" to be cache-friendlier.) That limits the size |
| 1398 | * transfers you can stream reliably; avoid more than 64 msec per urb. |
| 1399 | * Also avoid queue depths of less than ehci's worst irq latency (affected |
| 1400 | * by the per-urb URB_NO_INTERRUPT hint, the log2_irq_thresh module parameter, |
| 1401 | * and other factors); or more than about 230 msec total (for portability, |
| 1402 | * given EHCI_TUNE_FLS and the slop). Or, write a smarter scheduler! |
| 1403 | */ |
| 1404 | |
Sarah Sharp | d7e055f | 2009-10-27 10:54:49 -0700 | [diff] [blame] | 1405 | #define SCHEDULE_SLOP 80 /* microframes */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | |
| 1407 | static int |
| 1408 | iso_stream_schedule ( |
| 1409 | struct ehci_hcd *ehci, |
| 1410 | struct urb *urb, |
| 1411 | struct ehci_iso_stream *stream |
| 1412 | ) |
| 1413 | { |
Alan Stern | ffda080 | 2010-07-14 11:03:46 -0400 | [diff] [blame] | 1414 | u32 now, next, start, period, span; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | int status; |
| 1416 | unsigned mod = ehci->periodic_size << 3; |
| 1417 | struct ehci_iso_sched *sched = urb->hcpriv; |
| 1418 | |
Alan Stern | ffda080 | 2010-07-14 11:03:46 -0400 | [diff] [blame] | 1419 | period = urb->interval; |
| 1420 | span = sched->span; |
| 1421 | if (!stream->highspeed) { |
| 1422 | period <<= 3; |
| 1423 | span <<= 3; |
| 1424 | } |
| 1425 | |
| 1426 | if (span > mod - SCHEDULE_SLOP) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | ehci_dbg (ehci, "iso request %p too long\n", urb); |
| 1428 | status = -EFBIG; |
| 1429 | goto fail; |
| 1430 | } |
| 1431 | |
Alan Stern | 68aa95d | 2011-10-12 10:39:14 -0400 | [diff] [blame] | 1432 | now = ehci_read_frame_index(ehci) & (mod - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1433 | |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 1434 | /* Typical case: reuse current schedule, stream is still active. |
| 1435 | * Hopefully there are no gaps from the host falling behind |
| 1436 | * (irq delays etc), but if there are we'll take the next |
| 1437 | * slot in the schedule, implicitly assuming URB_ISO_ASAP. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | */ |
| 1439 | if (likely (!list_empty (&stream->td_list))) { |
Alan Stern | 1fb2e05 | 2010-07-14 11:03:53 -0400 | [diff] [blame] | 1440 | u32 excess; |
Sarah Sharp | dccd574 | 2009-10-27 10:55:05 -0700 | [diff] [blame] | 1441 | |
| 1442 | /* For high speed devices, allow scheduling within the |
Alan Stern | ae68a83 | 2010-07-14 11:03:23 -0400 | [diff] [blame] | 1443 | * isochronous scheduling threshold. For full speed devices |
| 1444 | * and Intel PCI-based controllers, don't (work around for |
| 1445 | * Intel ICH9 bug). |
Sarah Sharp | dccd574 | 2009-10-27 10:55:05 -0700 | [diff] [blame] | 1446 | */ |
Alan Stern | ae68a83 | 2010-07-14 11:03:23 -0400 | [diff] [blame] | 1447 | if (!stream->highspeed && ehci->fs_i_thresh) |
Sarah Sharp | dccd574 | 2009-10-27 10:55:05 -0700 | [diff] [blame] | 1448 | next = now + ehci->i_thresh; |
| 1449 | else |
| 1450 | next = now; |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 1451 | |
Alan Stern | 1fb2e05 | 2010-07-14 11:03:53 -0400 | [diff] [blame] | 1452 | /* Fell behind (by up to twice the slop amount)? |
| 1453 | * We decide based on the time of the last currently-scheduled |
| 1454 | * slot, not the time of the next available slot. |
| 1455 | */ |
| 1456 | excess = (stream->next_uframe - period - next) & (mod - 1); |
| 1457 | if (excess >= mod - 2 * SCHEDULE_SLOP) |
| 1458 | start = next + excess - mod + period * |
| 1459 | DIV_ROUND_UP(mod - excess, period); |
| 1460 | else |
| 1461 | start = next + excess + period; |
| 1462 | if (start - now >= mod) { |
| 1463 | ehci_dbg(ehci, "request %p would overflow (%d+%d >= %d)\n", |
| 1464 | urb, start - now - period, period, |
| 1465 | mod); |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 1466 | status = -EFBIG; |
| 1467 | goto fail; |
| 1468 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | } |
| 1470 | |
| 1471 | /* need to schedule; when's the next (u)frame we could start? |
| 1472 | * this is bigger than ehci->i_thresh allows; scheduling itself |
| 1473 | * isn't free, the slop should handle reasonably slow cpus. it |
| 1474 | * can also help high bandwidth if the dma and irq loads don't |
| 1475 | * jump until after the queue is primed. |
| 1476 | */ |
Alan Stern | 1fb2e05 | 2010-07-14 11:03:53 -0400 | [diff] [blame] | 1477 | else { |
Matthieu CASTET | e342090 | 2011-11-28 11:30:22 +0100 | [diff] [blame] | 1478 | int done = 0; |
Alan Stern | 1fb2e05 | 2010-07-14 11:03:53 -0400 | [diff] [blame] | 1479 | start = SCHEDULE_SLOP + (now & ~0x07); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1480 | |
Alan Stern | 1fb2e05 | 2010-07-14 11:03:53 -0400 | [diff] [blame] | 1481 | /* NOTE: assumes URB_ISO_ASAP, to limit complexity/bugs */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | |
Thomas Poussevin | 811c926 | 2011-10-27 18:46:48 +0200 | [diff] [blame] | 1483 | /* find a uframe slot with enough bandwidth. |
| 1484 | * Early uframes are more precious because full-speed |
| 1485 | * iso IN transfers can't use late uframes, |
| 1486 | * and therefore they should be allocated last. |
| 1487 | */ |
| 1488 | next = start; |
| 1489 | start += period; |
| 1490 | do { |
| 1491 | start--; |
Alan Stern | 1fb2e05 | 2010-07-14 11:03:53 -0400 | [diff] [blame] | 1492 | /* check schedule: enough space? */ |
| 1493 | if (stream->highspeed) { |
| 1494 | if (itd_slot_ok(ehci, mod, start, |
| 1495 | stream->usecs, period)) |
Matthieu CASTET | e342090 | 2011-11-28 11:30:22 +0100 | [diff] [blame] | 1496 | done = 1; |
Alan Stern | 1fb2e05 | 2010-07-14 11:03:53 -0400 | [diff] [blame] | 1497 | } else { |
| 1498 | if ((start % 8) >= 6) |
| 1499 | continue; |
| 1500 | if (sitd_slot_ok(ehci, mod, stream, |
| 1501 | start, sched, period)) |
Matthieu CASTET | e342090 | 2011-11-28 11:30:22 +0100 | [diff] [blame] | 1502 | done = 1; |
Alan Stern | 1fb2e05 | 2010-07-14 11:03:53 -0400 | [diff] [blame] | 1503 | } |
Matthieu CASTET | e342090 | 2011-11-28 11:30:22 +0100 | [diff] [blame] | 1504 | } while (start > next && !done); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | |
Alan Stern | 1fb2e05 | 2010-07-14 11:03:53 -0400 | [diff] [blame] | 1506 | /* no room in the schedule */ |
Matthieu CASTET | e342090 | 2011-11-28 11:30:22 +0100 | [diff] [blame] | 1507 | if (!done) { |
Alan Stern | 1fb2e05 | 2010-07-14 11:03:53 -0400 | [diff] [blame] | 1508 | ehci_dbg(ehci, "iso resched full %p (now %d max %d)\n", |
| 1509 | urb, now, now + mod); |
| 1510 | status = -ENOSPC; |
| 1511 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | } |
| 1513 | } |
| 1514 | |
Alan Stern | 1fb2e05 | 2010-07-14 11:03:53 -0400 | [diff] [blame] | 1515 | /* Tried to schedule too far into the future? */ |
| 1516 | if (unlikely(start - now + span - period |
| 1517 | >= mod - 2 * SCHEDULE_SLOP)) { |
| 1518 | ehci_dbg(ehci, "request %p would overflow (%d+%d >= %d)\n", |
| 1519 | urb, start - now, span - period, |
| 1520 | mod - 2 * SCHEDULE_SLOP); |
| 1521 | status = -EFBIG; |
| 1522 | goto fail; |
| 1523 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1524 | |
Alan Stern | 1fb2e05 | 2010-07-14 11:03:53 -0400 | [diff] [blame] | 1525 | stream->next_uframe = start & (mod - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1527 | /* report high speed start in uframes; full speed, in frames */ |
| 1528 | urb->start_frame = stream->next_uframe; |
| 1529 | if (!stream->highspeed) |
| 1530 | urb->start_frame >>= 3; |
| 1531 | return 0; |
Alan Stern | 1fb2e05 | 2010-07-14 11:03:53 -0400 | [diff] [blame] | 1532 | |
| 1533 | fail: |
| 1534 | iso_sched_free(stream, sched); |
| 1535 | urb->hcpriv = NULL; |
| 1536 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | } |
| 1538 | |
| 1539 | /*-------------------------------------------------------------------------*/ |
| 1540 | |
| 1541 | static inline void |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1542 | itd_init(struct ehci_hcd *ehci, struct ehci_iso_stream *stream, |
| 1543 | struct ehci_itd *itd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1544 | { |
| 1545 | int i; |
| 1546 | |
David Brownell | 7707857 | 2005-05-28 10:46:18 -0700 | [diff] [blame] | 1547 | /* it's been recently zeroed */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1548 | itd->hw_next = EHCI_LIST_END(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | itd->hw_bufp [0] = stream->buf0; |
| 1550 | itd->hw_bufp [1] = stream->buf1; |
| 1551 | itd->hw_bufp [2] = stream->buf2; |
| 1552 | |
| 1553 | for (i = 0; i < 8; i++) |
| 1554 | itd->index[i] = -1; |
| 1555 | |
| 1556 | /* All other fields are filled when scheduling */ |
| 1557 | } |
| 1558 | |
| 1559 | static inline void |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1560 | itd_patch( |
| 1561 | struct ehci_hcd *ehci, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1562 | struct ehci_itd *itd, |
| 1563 | struct ehci_iso_sched *iso_sched, |
| 1564 | unsigned index, |
David Brownell | 7707857 | 2005-05-28 10:46:18 -0700 | [diff] [blame] | 1565 | u16 uframe |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1566 | ) |
| 1567 | { |
| 1568 | struct ehci_iso_packet *uf = &iso_sched->packet [index]; |
| 1569 | unsigned pg = itd->pg; |
| 1570 | |
| 1571 | // BUG_ON (pg == 6 && uf->cross); |
| 1572 | |
| 1573 | uframe &= 0x07; |
| 1574 | itd->index [uframe] = index; |
| 1575 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1576 | itd->hw_transaction[uframe] = uf->transaction; |
| 1577 | itd->hw_transaction[uframe] |= cpu_to_hc32(ehci, pg << 12); |
| 1578 | itd->hw_bufp[pg] |= cpu_to_hc32(ehci, uf->bufp & ~(u32)0); |
| 1579 | 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] | 1580 | |
| 1581 | /* iso_frame_desc[].offset must be strictly increasing */ |
David Brownell | 7707857 | 2005-05-28 10:46:18 -0700 | [diff] [blame] | 1582 | if (unlikely (uf->cross)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | u64 bufp = uf->bufp + 4096; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1584 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1585 | itd->pg = ++pg; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1586 | itd->hw_bufp[pg] |= cpu_to_hc32(ehci, bufp & ~(u32)0); |
| 1587 | itd->hw_bufp_hi[pg] |= cpu_to_hc32(ehci, (u32)(bufp >> 32)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | } |
| 1589 | } |
| 1590 | |
| 1591 | static inline void |
| 1592 | itd_link (struct ehci_hcd *ehci, unsigned frame, struct ehci_itd *itd) |
| 1593 | { |
Clemens Ladisch | 92bc364 | 2010-03-01 09:12:50 +0100 | [diff] [blame] | 1594 | union ehci_shadow *prev = &ehci->pshadow[frame]; |
| 1595 | __hc32 *hw_p = &ehci->periodic[frame]; |
| 1596 | union ehci_shadow here = *prev; |
| 1597 | __hc32 type = 0; |
| 1598 | |
| 1599 | /* skip any iso nodes which might belong to previous microframes */ |
| 1600 | while (here.ptr) { |
| 1601 | type = Q_NEXT_TYPE(ehci, *hw_p); |
| 1602 | if (type == cpu_to_hc32(ehci, Q_TYPE_QH)) |
| 1603 | break; |
| 1604 | prev = periodic_next_shadow(ehci, prev, type); |
| 1605 | hw_p = shadow_next_periodic(ehci, &here, type); |
| 1606 | here = *prev; |
| 1607 | } |
| 1608 | |
| 1609 | itd->itd_next = here; |
| 1610 | itd->hw_next = *hw_p; |
| 1611 | prev->itd = itd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | itd->frame = frame; |
| 1613 | wmb (); |
Clemens Ladisch | 92bc364 | 2010-03-01 09:12:50 +0100 | [diff] [blame] | 1614 | *hw_p = cpu_to_hc32(ehci, itd->itd_dma | Q_TYPE_ITD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1615 | } |
| 1616 | |
| 1617 | /* fit urb's itds into the selected schedule slot; activate as needed */ |
| 1618 | static int |
| 1619 | itd_link_urb ( |
| 1620 | struct ehci_hcd *ehci, |
| 1621 | struct urb *urb, |
| 1622 | unsigned mod, |
| 1623 | struct ehci_iso_stream *stream |
| 1624 | ) |
| 1625 | { |
David Brownell | 7707857 | 2005-05-28 10:46:18 -0700 | [diff] [blame] | 1626 | int packet; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1627 | unsigned next_uframe, uframe, frame; |
| 1628 | struct ehci_iso_sched *iso_sched = urb->hcpriv; |
| 1629 | struct ehci_itd *itd; |
| 1630 | |
Alan Stern | bccbefa | 2010-07-14 11:03:36 -0400 | [diff] [blame] | 1631 | next_uframe = stream->next_uframe & (mod - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | |
| 1633 | if (unlikely (list_empty(&stream->td_list))) { |
| 1634 | ehci_to_hcd(ehci)->self.bandwidth_allocated |
| 1635 | += stream->bandwidth; |
| 1636 | ehci_vdbg (ehci, |
| 1637 | "schedule devp %s ep%d%s-iso period %d start %d.%d\n", |
| 1638 | urb->dev->devpath, stream->bEndpointAddress & 0x0f, |
| 1639 | (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out", |
| 1640 | urb->interval, |
| 1641 | next_uframe >> 3, next_uframe & 0x7); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1642 | } |
Alex He | 0557029 | 2010-12-07 10:10:08 +0800 | [diff] [blame] | 1643 | |
| 1644 | if (ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs == 0) { |
Andiry Xu | ad93562 | 2011-03-01 14:57:05 +0800 | [diff] [blame] | 1645 | if (ehci->amd_pll_fix == 1) |
| 1646 | usb_amd_quirk_pll_disable(); |
Alex He | 0557029 | 2010-12-07 10:10:08 +0800 | [diff] [blame] | 1647 | } |
| 1648 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs++; |
| 1650 | |
| 1651 | /* fill iTDs uframe by uframe */ |
| 1652 | for (packet = 0, itd = NULL; packet < urb->number_of_packets; ) { |
| 1653 | if (itd == NULL) { |
| 1654 | /* ASSERT: we have all necessary itds */ |
| 1655 | // BUG_ON (list_empty (&iso_sched->td_list)); |
| 1656 | |
| 1657 | /* ASSERT: no itds for this endpoint in this uframe */ |
| 1658 | |
| 1659 | itd = list_entry (iso_sched->td_list.next, |
| 1660 | struct ehci_itd, itd_list); |
| 1661 | list_move_tail (&itd->itd_list, &stream->td_list); |
| 1662 | itd->stream = iso_stream_get (stream); |
Karsten Wiese | 508db8c | 2009-02-26 01:47:48 +0100 | [diff] [blame] | 1663 | itd->urb = urb; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1664 | itd_init (ehci, stream, itd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1665 | } |
| 1666 | |
| 1667 | uframe = next_uframe & 0x07; |
| 1668 | frame = next_uframe >> 3; |
| 1669 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1670 | itd_patch(ehci, itd, iso_sched, packet, uframe); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | |
| 1672 | next_uframe += stream->interval; |
Alan Stern | bccbefa | 2010-07-14 11:03:36 -0400 | [diff] [blame] | 1673 | next_uframe &= mod - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | packet++; |
| 1675 | |
| 1676 | /* link completed itds into the schedule */ |
| 1677 | if (((next_uframe >> 3) != frame) |
| 1678 | || packet == urb->number_of_packets) { |
Alan Stern | bccbefa | 2010-07-14 11:03:36 -0400 | [diff] [blame] | 1679 | itd_link(ehci, frame & (ehci->periodic_size - 1), itd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | itd = NULL; |
| 1681 | } |
| 1682 | } |
| 1683 | stream->next_uframe = next_uframe; |
| 1684 | |
| 1685 | /* don't need that schedule data any more */ |
| 1686 | iso_sched_free (stream, iso_sched); |
| 1687 | urb->hcpriv = NULL; |
| 1688 | |
| 1689 | timer_action (ehci, TIMER_IO_WATCHDOG); |
David Brownell | 01c1714 | 2008-08-26 23:35:04 -0700 | [diff] [blame] | 1690 | return enable_periodic(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | } |
| 1692 | |
| 1693 | #define ISO_ERRS (EHCI_ISOC_BUF_ERR | EHCI_ISOC_BABBLE | EHCI_ISOC_XACTERR) |
| 1694 | |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 1695 | /* Process and recycle a completed ITD. Return true iff its urb completed, |
| 1696 | * and hence its completion callback probably added things to the hardware |
| 1697 | * schedule. |
| 1698 | * |
| 1699 | * Note that we carefully avoid recycling this descriptor until after any |
| 1700 | * completion callback runs, so that it won't be reused quickly. That is, |
| 1701 | * assuming (a) no more than two urbs per frame on this endpoint, and also |
| 1702 | * (b) only this endpoint's completions submit URBs. It seems some silicon |
| 1703 | * corrupts things if you reuse completed descriptors very quickly... |
| 1704 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | static unsigned |
| 1706 | itd_complete ( |
| 1707 | struct ehci_hcd *ehci, |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1708 | struct ehci_itd *itd |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1709 | ) { |
| 1710 | struct urb *urb = itd->urb; |
| 1711 | struct usb_iso_packet_descriptor *desc; |
| 1712 | u32 t; |
| 1713 | unsigned uframe; |
| 1714 | int urb_index = -1; |
| 1715 | struct ehci_iso_stream *stream = itd->stream; |
| 1716 | struct usb_device *dev; |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 1717 | unsigned retval = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | |
| 1719 | /* for each uframe with a packet */ |
| 1720 | for (uframe = 0; uframe < 8; uframe++) { |
| 1721 | if (likely (itd->index[uframe] == -1)) |
| 1722 | continue; |
| 1723 | urb_index = itd->index[uframe]; |
| 1724 | desc = &urb->iso_frame_desc [urb_index]; |
| 1725 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1726 | t = hc32_to_cpup(ehci, &itd->hw_transaction [uframe]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1727 | itd->hw_transaction [uframe] = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1728 | |
| 1729 | /* report transfer status */ |
| 1730 | if (unlikely (t & ISO_ERRS)) { |
| 1731 | urb->error_count++; |
| 1732 | if (t & EHCI_ISOC_BUF_ERR) |
| 1733 | desc->status = usb_pipein (urb->pipe) |
| 1734 | ? -ENOSR /* hc couldn't read */ |
| 1735 | : -ECOMM; /* hc couldn't write */ |
| 1736 | else if (t & EHCI_ISOC_BABBLE) |
| 1737 | desc->status = -EOVERFLOW; |
| 1738 | else /* (t & EHCI_ISOC_XACTERR) */ |
| 1739 | desc->status = -EPROTO; |
| 1740 | |
| 1741 | /* HC need not update length with this error */ |
Alan Stern | ec6d67e | 2009-06-29 14:34:59 -0400 | [diff] [blame] | 1742 | if (!(t & EHCI_ISOC_BABBLE)) { |
| 1743 | desc->actual_length = EHCI_ITD_LENGTH(t); |
| 1744 | urb->actual_length += desc->actual_length; |
| 1745 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1746 | } else if (likely ((t & EHCI_ISOC_ACTIVE) == 0)) { |
| 1747 | desc->status = 0; |
Alan Stern | ec6d67e | 2009-06-29 14:34:59 -0400 | [diff] [blame] | 1748 | desc->actual_length = EHCI_ITD_LENGTH(t); |
| 1749 | urb->actual_length += desc->actual_length; |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 1750 | } else { |
| 1751 | /* URB was too late */ |
| 1752 | desc->status = -EXDEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1753 | } |
| 1754 | } |
| 1755 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1756 | /* handle completion now? */ |
| 1757 | if (likely ((urb_index + 1) != urb->number_of_packets)) |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 1758 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | |
| 1760 | /* ASSERT: it's really the last itd for this urb |
| 1761 | list_for_each_entry (itd, &stream->td_list, itd_list) |
| 1762 | BUG_ON (itd->urb == urb); |
| 1763 | */ |
| 1764 | |
David Brownell | aa16ca3 | 2007-12-30 23:45:19 -0800 | [diff] [blame] | 1765 | /* give urb back to the driver; completion often (re)submits */ |
Alan Stern | 6a8e87b | 2006-01-19 10:46:27 -0500 | [diff] [blame] | 1766 | dev = urb->dev; |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 1767 | ehci_urb_done(ehci, urb, 0); |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 1768 | retval = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1769 | urb = NULL; |
David Brownell | 01c1714 | 2008-08-26 23:35:04 -0700 | [diff] [blame] | 1770 | (void) disable_periodic(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1771 | ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs--; |
| 1772 | |
Alex He | 0557029 | 2010-12-07 10:10:08 +0800 | [diff] [blame] | 1773 | if (ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs == 0) { |
Andiry Xu | ad93562 | 2011-03-01 14:57:05 +0800 | [diff] [blame] | 1774 | if (ehci->amd_pll_fix == 1) |
| 1775 | usb_amd_quirk_pll_enable(); |
Alex He | 0557029 | 2010-12-07 10:10:08 +0800 | [diff] [blame] | 1776 | } |
| 1777 | |
Karsten Wiese | 508db8c | 2009-02-26 01:47:48 +0100 | [diff] [blame] | 1778 | if (unlikely(list_is_singular(&stream->td_list))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1779 | ehci_to_hcd(ehci)->self.bandwidth_allocated |
| 1780 | -= stream->bandwidth; |
| 1781 | ehci_vdbg (ehci, |
| 1782 | "deschedule devp %s ep%d%s-iso\n", |
| 1783 | dev->devpath, stream->bEndpointAddress & 0x0f, |
| 1784 | (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out"); |
| 1785 | } |
| 1786 | iso_stream_put (ehci, stream); |
Karsten Wiese | 9aa09d2 | 2009-02-08 16:07:58 -0800 | [diff] [blame] | 1787 | |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 1788 | done: |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 1789 | itd->urb = NULL; |
Karsten Wiese | 9aa09d2 | 2009-02-08 16:07:58 -0800 | [diff] [blame] | 1790 | if (ehci->clock_frame != itd->frame || itd->index[7] != -1) { |
| 1791 | /* OK to recycle this ITD now. */ |
| 1792 | itd->stream = NULL; |
| 1793 | list_move(&itd->itd_list, &stream->free_list); |
| 1794 | iso_stream_put(ehci, stream); |
| 1795 | } else { |
| 1796 | /* HW might remember this ITD, so we can't recycle it yet. |
| 1797 | * Move it to a safe place until a new frame starts. |
| 1798 | */ |
| 1799 | list_move(&itd->itd_list, &ehci->cached_itd_list); |
| 1800 | if (stream->refcount == 2) { |
| 1801 | /* If iso_stream_put() were called here, stream |
| 1802 | * would be freed. Instead, just prevent reuse. |
| 1803 | */ |
| 1804 | stream->ep->hcpriv = NULL; |
| 1805 | stream->ep = NULL; |
| 1806 | } |
| 1807 | } |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 1808 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1809 | } |
| 1810 | |
| 1811 | /*-------------------------------------------------------------------------*/ |
| 1812 | |
Olav Kongas | 5db539e | 2005-06-23 20:25:36 +0300 | [diff] [blame] | 1813 | static int itd_submit (struct ehci_hcd *ehci, struct urb *urb, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 1814 | gfp_t mem_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1815 | { |
| 1816 | int status = -EINVAL; |
| 1817 | unsigned long flags; |
| 1818 | struct ehci_iso_stream *stream; |
| 1819 | |
| 1820 | /* Get iso_stream head */ |
| 1821 | stream = iso_stream_find (ehci, urb); |
| 1822 | if (unlikely (stream == NULL)) { |
| 1823 | ehci_dbg (ehci, "can't get iso stream\n"); |
| 1824 | return -ENOMEM; |
| 1825 | } |
| 1826 | if (unlikely (urb->interval != stream->interval)) { |
| 1827 | ehci_dbg (ehci, "can't change iso interval %d --> %d\n", |
| 1828 | stream->interval, urb->interval); |
| 1829 | goto done; |
| 1830 | } |
| 1831 | |
| 1832 | #ifdef EHCI_URB_TRACE |
| 1833 | ehci_dbg (ehci, |
| 1834 | "%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] | 1835 | __func__, urb->dev->devpath, urb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1836 | usb_pipeendpoint (urb->pipe), |
| 1837 | usb_pipein (urb->pipe) ? "in" : "out", |
| 1838 | urb->transfer_buffer_length, |
| 1839 | urb->number_of_packets, urb->interval, |
| 1840 | stream); |
| 1841 | #endif |
| 1842 | |
| 1843 | /* allocate ITDs w/o locking anything */ |
| 1844 | status = itd_urb_transaction (stream, ehci, urb, mem_flags); |
| 1845 | if (unlikely (status < 0)) { |
| 1846 | ehci_dbg (ehci, "can't init itds\n"); |
| 1847 | goto done; |
| 1848 | } |
| 1849 | |
| 1850 | /* schedule ... need to lock */ |
| 1851 | spin_lock_irqsave (&ehci->lock, flags); |
Alan Stern | 541c7d4 | 2010-06-22 16:39:10 -0400 | [diff] [blame] | 1852 | if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) { |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1853 | status = -ESHUTDOWN; |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1854 | goto done_not_linked; |
| 1855 | } |
| 1856 | status = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb); |
| 1857 | if (unlikely(status)) |
| 1858 | goto done_not_linked; |
| 1859 | status = iso_stream_schedule(ehci, urb, stream); |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 1860 | if (likely (status == 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1861 | itd_link_urb (ehci, urb, ehci->periodic_size << 3, stream); |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1862 | else |
| 1863 | usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb); |
| 1864 | done_not_linked: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1865 | spin_unlock_irqrestore (&ehci->lock, flags); |
| 1866 | |
| 1867 | done: |
| 1868 | if (unlikely (status < 0)) |
| 1869 | iso_stream_put (ehci, stream); |
| 1870 | return status; |
| 1871 | } |
| 1872 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1873 | /*-------------------------------------------------------------------------*/ |
| 1874 | |
| 1875 | /* |
| 1876 | * "Split ISO TDs" ... used for USB 1.1 devices going through the |
| 1877 | * TTs in USB 2.0 hubs. These need microframe scheduling. |
| 1878 | */ |
| 1879 | |
| 1880 | static inline void |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1881 | sitd_sched_init( |
| 1882 | struct ehci_hcd *ehci, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1883 | struct ehci_iso_sched *iso_sched, |
| 1884 | struct ehci_iso_stream *stream, |
| 1885 | struct urb *urb |
| 1886 | ) |
| 1887 | { |
| 1888 | unsigned i; |
| 1889 | dma_addr_t dma = urb->transfer_dma; |
| 1890 | |
| 1891 | /* how many frames are needed for these transfers */ |
| 1892 | iso_sched->span = urb->number_of_packets * stream->interval; |
| 1893 | |
| 1894 | /* figure out per-frame sitd fields that we'll need later |
| 1895 | * when we fit new sitds into the schedule. |
| 1896 | */ |
| 1897 | for (i = 0; i < urb->number_of_packets; i++) { |
| 1898 | struct ehci_iso_packet *packet = &iso_sched->packet [i]; |
| 1899 | unsigned length; |
| 1900 | dma_addr_t buf; |
| 1901 | u32 trans; |
| 1902 | |
| 1903 | length = urb->iso_frame_desc [i].length & 0x03ff; |
| 1904 | buf = dma + urb->iso_frame_desc [i].offset; |
| 1905 | |
| 1906 | trans = SITD_STS_ACTIVE; |
| 1907 | if (((i + 1) == urb->number_of_packets) |
| 1908 | && !(urb->transfer_flags & URB_NO_INTERRUPT)) |
| 1909 | trans |= SITD_IOC; |
| 1910 | trans |= length << 16; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1911 | packet->transaction = cpu_to_hc32(ehci, trans); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1912 | |
| 1913 | /* might need to cross a buffer page within a td */ |
| 1914 | packet->bufp = buf; |
| 1915 | packet->buf1 = (buf + length) & ~0x0fff; |
| 1916 | if (packet->buf1 != (buf & ~(u64)0x0fff)) |
| 1917 | packet->cross = 1; |
| 1918 | |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 1919 | /* OUT uses multiple start-splits */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1920 | if (stream->bEndpointAddress & USB_DIR_IN) |
| 1921 | continue; |
| 1922 | length = (length + 187) / 188; |
| 1923 | if (length > 1) /* BEGIN vs ALL */ |
| 1924 | length |= 1 << 3; |
| 1925 | packet->buf1 |= length; |
| 1926 | } |
| 1927 | } |
| 1928 | |
| 1929 | static int |
| 1930 | sitd_urb_transaction ( |
| 1931 | struct ehci_iso_stream *stream, |
| 1932 | struct ehci_hcd *ehci, |
| 1933 | struct urb *urb, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 1934 | gfp_t mem_flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1935 | ) |
| 1936 | { |
| 1937 | struct ehci_sitd *sitd; |
| 1938 | dma_addr_t sitd_dma; |
| 1939 | int i; |
| 1940 | struct ehci_iso_sched *iso_sched; |
| 1941 | unsigned long flags; |
| 1942 | |
| 1943 | iso_sched = iso_sched_alloc (urb->number_of_packets, mem_flags); |
| 1944 | if (iso_sched == NULL) |
| 1945 | return -ENOMEM; |
| 1946 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1947 | sitd_sched_init(ehci, iso_sched, stream, urb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1948 | |
| 1949 | /* allocate/init sITDs */ |
| 1950 | spin_lock_irqsave (&ehci->lock, flags); |
| 1951 | for (i = 0; i < urb->number_of_packets; i++) { |
| 1952 | |
| 1953 | /* NOTE: for now, we don't try to handle wraparound cases |
| 1954 | * for IN (using sitd->hw_backpointer, like a FSTN), which |
| 1955 | * means we never need two sitds for full speed packets. |
| 1956 | */ |
| 1957 | |
| 1958 | /* free_list.next might be cache-hot ... but maybe |
| 1959 | * the HC caches it too. avoid that issue for now. |
| 1960 | */ |
| 1961 | |
| 1962 | /* prefer previously-allocated sitds */ |
| 1963 | if (!list_empty(&stream->free_list)) { |
| 1964 | sitd = list_entry (stream->free_list.prev, |
| 1965 | struct ehci_sitd, sitd_list); |
| 1966 | list_del (&sitd->sitd_list); |
| 1967 | sitd_dma = sitd->sitd_dma; |
Karsten Wiese | 3d01f0f | 2008-02-19 12:31:49 -0800 | [diff] [blame] | 1968 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1969 | spin_unlock_irqrestore (&ehci->lock, flags); |
| 1970 | sitd = dma_pool_alloc (ehci->sitd_pool, mem_flags, |
| 1971 | &sitd_dma); |
| 1972 | spin_lock_irqsave (&ehci->lock, flags); |
Karsten Wiese | 3d01f0f | 2008-02-19 12:31:49 -0800 | [diff] [blame] | 1973 | if (!sitd) { |
| 1974 | iso_sched_free(stream, iso_sched); |
| 1975 | spin_unlock_irqrestore(&ehci->lock, flags); |
| 1976 | return -ENOMEM; |
| 1977 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1978 | } |
| 1979 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1980 | memset (sitd, 0, sizeof *sitd); |
| 1981 | sitd->sitd_dma = sitd_dma; |
| 1982 | list_add (&sitd->sitd_list, &iso_sched->td_list); |
| 1983 | } |
| 1984 | |
| 1985 | /* temporarily store schedule info in hcpriv */ |
| 1986 | urb->hcpriv = iso_sched; |
| 1987 | urb->error_count = 0; |
| 1988 | |
| 1989 | spin_unlock_irqrestore (&ehci->lock, flags); |
| 1990 | return 0; |
| 1991 | } |
| 1992 | |
| 1993 | /*-------------------------------------------------------------------------*/ |
| 1994 | |
| 1995 | static inline void |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1996 | sitd_patch( |
| 1997 | struct ehci_hcd *ehci, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1998 | struct ehci_iso_stream *stream, |
| 1999 | struct ehci_sitd *sitd, |
| 2000 | struct ehci_iso_sched *iso_sched, |
| 2001 | unsigned index |
| 2002 | ) |
| 2003 | { |
| 2004 | struct ehci_iso_packet *uf = &iso_sched->packet [index]; |
| 2005 | u64 bufp = uf->bufp; |
| 2006 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2007 | sitd->hw_next = EHCI_LIST_END(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2008 | sitd->hw_fullspeed_ep = stream->address; |
| 2009 | sitd->hw_uframe = stream->splits; |
| 2010 | sitd->hw_results = uf->transaction; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2011 | sitd->hw_backpointer = EHCI_LIST_END(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2012 | |
| 2013 | bufp = uf->bufp; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2014 | sitd->hw_buf[0] = cpu_to_hc32(ehci, bufp); |
| 2015 | sitd->hw_buf_hi[0] = cpu_to_hc32(ehci, bufp >> 32); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2016 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2017 | sitd->hw_buf[1] = cpu_to_hc32(ehci, uf->buf1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2018 | if (uf->cross) |
| 2019 | bufp += 4096; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2020 | sitd->hw_buf_hi[1] = cpu_to_hc32(ehci, bufp >> 32); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2021 | sitd->index = index; |
| 2022 | } |
| 2023 | |
| 2024 | static inline void |
| 2025 | sitd_link (struct ehci_hcd *ehci, unsigned frame, struct ehci_sitd *sitd) |
| 2026 | { |
| 2027 | /* note: sitd ordering could matter (CSPLIT then SSPLIT) */ |
| 2028 | sitd->sitd_next = ehci->pshadow [frame]; |
| 2029 | sitd->hw_next = ehci->periodic [frame]; |
| 2030 | ehci->pshadow [frame].sitd = sitd; |
| 2031 | sitd->frame = frame; |
| 2032 | wmb (); |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2033 | 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] | 2034 | } |
| 2035 | |
| 2036 | /* fit urb's sitds into the selected schedule slot; activate as needed */ |
| 2037 | static int |
| 2038 | sitd_link_urb ( |
| 2039 | struct ehci_hcd *ehci, |
| 2040 | struct urb *urb, |
| 2041 | unsigned mod, |
| 2042 | struct ehci_iso_stream *stream |
| 2043 | ) |
| 2044 | { |
| 2045 | int packet; |
| 2046 | unsigned next_uframe; |
| 2047 | struct ehci_iso_sched *sched = urb->hcpriv; |
| 2048 | struct ehci_sitd *sitd; |
| 2049 | |
| 2050 | next_uframe = stream->next_uframe; |
| 2051 | |
| 2052 | if (list_empty(&stream->td_list)) { |
| 2053 | /* usbfs ignores TT bandwidth */ |
| 2054 | ehci_to_hcd(ehci)->self.bandwidth_allocated |
| 2055 | += stream->bandwidth; |
| 2056 | ehci_vdbg (ehci, |
| 2057 | "sched devp %s ep%d%s-iso [%d] %dms/%04x\n", |
| 2058 | urb->dev->devpath, stream->bEndpointAddress & 0x0f, |
| 2059 | (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out", |
Alan Stern | bccbefa | 2010-07-14 11:03:36 -0400 | [diff] [blame] | 2060 | (next_uframe >> 3) & (ehci->periodic_size - 1), |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2061 | stream->interval, hc32_to_cpu(ehci, stream->splits)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2062 | } |
Alex He | 0557029 | 2010-12-07 10:10:08 +0800 | [diff] [blame] | 2063 | |
| 2064 | if (ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs == 0) { |
Andiry Xu | ad93562 | 2011-03-01 14:57:05 +0800 | [diff] [blame] | 2065 | if (ehci->amd_pll_fix == 1) |
| 2066 | usb_amd_quirk_pll_disable(); |
Alex He | 0557029 | 2010-12-07 10:10:08 +0800 | [diff] [blame] | 2067 | } |
| 2068 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2069 | ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs++; |
| 2070 | |
| 2071 | /* fill sITDs frame by frame */ |
| 2072 | for (packet = 0, sitd = NULL; |
| 2073 | packet < urb->number_of_packets; |
| 2074 | packet++) { |
| 2075 | |
| 2076 | /* ASSERT: we have all necessary sitds */ |
| 2077 | BUG_ON (list_empty (&sched->td_list)); |
| 2078 | |
| 2079 | /* ASSERT: no itds for this endpoint in this frame */ |
| 2080 | |
| 2081 | sitd = list_entry (sched->td_list.next, |
| 2082 | struct ehci_sitd, sitd_list); |
| 2083 | list_move_tail (&sitd->sitd_list, &stream->td_list); |
| 2084 | sitd->stream = iso_stream_get (stream); |
Karsten Wiese | 508db8c | 2009-02-26 01:47:48 +0100 | [diff] [blame] | 2085 | sitd->urb = urb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2086 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2087 | sitd_patch(ehci, stream, sitd, sched, packet); |
Alan Stern | bccbefa | 2010-07-14 11:03:36 -0400 | [diff] [blame] | 2088 | sitd_link(ehci, (next_uframe >> 3) & (ehci->periodic_size - 1), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | sitd); |
| 2090 | |
| 2091 | next_uframe += stream->interval << 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2092 | } |
Alan Stern | bccbefa | 2010-07-14 11:03:36 -0400 | [diff] [blame] | 2093 | stream->next_uframe = next_uframe & (mod - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2094 | |
| 2095 | /* don't need that schedule data any more */ |
| 2096 | iso_sched_free (stream, sched); |
| 2097 | urb->hcpriv = NULL; |
| 2098 | |
| 2099 | timer_action (ehci, TIMER_IO_WATCHDOG); |
David Brownell | 01c1714 | 2008-08-26 23:35:04 -0700 | [diff] [blame] | 2100 | return enable_periodic(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2101 | } |
| 2102 | |
| 2103 | /*-------------------------------------------------------------------------*/ |
| 2104 | |
| 2105 | #define SITD_ERRS (SITD_STS_ERR | SITD_STS_DBE | SITD_STS_BABBLE \ |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 2106 | | SITD_STS_XACT | SITD_STS_MMF) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2107 | |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 2108 | /* Process and recycle a completed SITD. Return true iff its urb completed, |
| 2109 | * and hence its completion callback probably added things to the hardware |
| 2110 | * schedule. |
| 2111 | * |
| 2112 | * Note that we carefully avoid recycling this descriptor until after any |
| 2113 | * completion callback runs, so that it won't be reused quickly. That is, |
| 2114 | * assuming (a) no more than two urbs per frame on this endpoint, and also |
| 2115 | * (b) only this endpoint's completions submit URBs. It seems some silicon |
| 2116 | * corrupts things if you reuse completed descriptors very quickly... |
| 2117 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2118 | static unsigned |
| 2119 | sitd_complete ( |
| 2120 | struct ehci_hcd *ehci, |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 2121 | struct ehci_sitd *sitd |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2122 | ) { |
| 2123 | struct urb *urb = sitd->urb; |
| 2124 | struct usb_iso_packet_descriptor *desc; |
| 2125 | u32 t; |
| 2126 | int urb_index = -1; |
| 2127 | struct ehci_iso_stream *stream = sitd->stream; |
| 2128 | struct usb_device *dev; |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 2129 | unsigned retval = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2130 | |
| 2131 | urb_index = sitd->index; |
| 2132 | desc = &urb->iso_frame_desc [urb_index]; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2133 | t = hc32_to_cpup(ehci, &sitd->hw_results); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2134 | |
| 2135 | /* report transfer status */ |
| 2136 | if (t & SITD_ERRS) { |
| 2137 | urb->error_count++; |
| 2138 | if (t & SITD_STS_DBE) |
| 2139 | desc->status = usb_pipein (urb->pipe) |
| 2140 | ? -ENOSR /* hc couldn't read */ |
| 2141 | : -ECOMM; /* hc couldn't write */ |
| 2142 | else if (t & SITD_STS_BABBLE) |
| 2143 | desc->status = -EOVERFLOW; |
| 2144 | else /* XACT, MMF, etc */ |
| 2145 | desc->status = -EPROTO; |
| 2146 | } else { |
| 2147 | desc->status = 0; |
Alan Stern | ec6d67e | 2009-06-29 14:34:59 -0400 | [diff] [blame] | 2148 | desc->actual_length = desc->length - SITD_LENGTH(t); |
| 2149 | urb->actual_length += desc->actual_length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2150 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2151 | |
| 2152 | /* handle completion now? */ |
| 2153 | if ((urb_index + 1) != urb->number_of_packets) |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 2154 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2155 | |
| 2156 | /* ASSERT: it's really the last sitd for this urb |
| 2157 | list_for_each_entry (sitd, &stream->td_list, sitd_list) |
| 2158 | BUG_ON (sitd->urb == urb); |
| 2159 | */ |
| 2160 | |
David Brownell | aa16ca3 | 2007-12-30 23:45:19 -0800 | [diff] [blame] | 2161 | /* give urb back to the driver; completion often (re)submits */ |
Alan Stern | 6a8e87b | 2006-01-19 10:46:27 -0500 | [diff] [blame] | 2162 | dev = urb->dev; |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 2163 | ehci_urb_done(ehci, urb, 0); |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 2164 | retval = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2165 | urb = NULL; |
David Brownell | 01c1714 | 2008-08-26 23:35:04 -0700 | [diff] [blame] | 2166 | (void) disable_periodic(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2167 | ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs--; |
| 2168 | |
Alex He | 0557029 | 2010-12-07 10:10:08 +0800 | [diff] [blame] | 2169 | if (ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs == 0) { |
Andiry Xu | ad93562 | 2011-03-01 14:57:05 +0800 | [diff] [blame] | 2170 | if (ehci->amd_pll_fix == 1) |
| 2171 | usb_amd_quirk_pll_enable(); |
Alex He | 0557029 | 2010-12-07 10:10:08 +0800 | [diff] [blame] | 2172 | } |
| 2173 | |
Karsten Wiese | 508db8c | 2009-02-26 01:47:48 +0100 | [diff] [blame] | 2174 | if (list_is_singular(&stream->td_list)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2175 | ehci_to_hcd(ehci)->self.bandwidth_allocated |
| 2176 | -= stream->bandwidth; |
| 2177 | ehci_vdbg (ehci, |
| 2178 | "deschedule devp %s ep%d%s-iso\n", |
| 2179 | dev->devpath, stream->bEndpointAddress & 0x0f, |
| 2180 | (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out"); |
| 2181 | } |
| 2182 | iso_stream_put (ehci, stream); |
Alan Stern | 0e5f231 | 2010-04-08 16:56:37 -0400 | [diff] [blame] | 2183 | |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 2184 | done: |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 2185 | sitd->urb = NULL; |
Alan Stern | 0e5f231 | 2010-04-08 16:56:37 -0400 | [diff] [blame] | 2186 | if (ehci->clock_frame != sitd->frame) { |
| 2187 | /* OK to recycle this SITD now. */ |
| 2188 | sitd->stream = NULL; |
| 2189 | list_move(&sitd->sitd_list, &stream->free_list); |
| 2190 | iso_stream_put(ehci, stream); |
| 2191 | } else { |
| 2192 | /* HW might remember this SITD, so we can't recycle it yet. |
| 2193 | * Move it to a safe place until a new frame starts. |
| 2194 | */ |
| 2195 | list_move(&sitd->sitd_list, &ehci->cached_sitd_list); |
| 2196 | if (stream->refcount == 2) { |
| 2197 | /* If iso_stream_put() were called here, stream |
| 2198 | * would be freed. Instead, just prevent reuse. |
| 2199 | */ |
| 2200 | stream->ep->hcpriv = NULL; |
| 2201 | stream->ep = NULL; |
| 2202 | } |
| 2203 | } |
David Brownell | 30bf54e | 2007-12-16 22:37:40 -0800 | [diff] [blame] | 2204 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2205 | } |
| 2206 | |
| 2207 | |
Olav Kongas | 5db539e | 2005-06-23 20:25:36 +0300 | [diff] [blame] | 2208 | static int sitd_submit (struct ehci_hcd *ehci, struct urb *urb, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 2209 | gfp_t mem_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2210 | { |
| 2211 | int status = -EINVAL; |
| 2212 | unsigned long flags; |
| 2213 | struct ehci_iso_stream *stream; |
| 2214 | |
| 2215 | /* Get iso_stream head */ |
| 2216 | stream = iso_stream_find (ehci, urb); |
| 2217 | if (stream == NULL) { |
| 2218 | ehci_dbg (ehci, "can't get iso stream\n"); |
| 2219 | return -ENOMEM; |
| 2220 | } |
| 2221 | if (urb->interval != stream->interval) { |
| 2222 | ehci_dbg (ehci, "can't change iso interval %d --> %d\n", |
| 2223 | stream->interval, urb->interval); |
| 2224 | goto done; |
| 2225 | } |
| 2226 | |
| 2227 | #ifdef EHCI_URB_TRACE |
| 2228 | ehci_dbg (ehci, |
| 2229 | "submit %p dev%s ep%d%s-iso len %d\n", |
| 2230 | urb, urb->dev->devpath, |
| 2231 | usb_pipeendpoint (urb->pipe), |
| 2232 | usb_pipein (urb->pipe) ? "in" : "out", |
| 2233 | urb->transfer_buffer_length); |
| 2234 | #endif |
| 2235 | |
| 2236 | /* allocate SITDs */ |
| 2237 | status = sitd_urb_transaction (stream, ehci, urb, mem_flags); |
| 2238 | if (status < 0) { |
| 2239 | ehci_dbg (ehci, "can't init sitds\n"); |
| 2240 | goto done; |
| 2241 | } |
| 2242 | |
| 2243 | /* schedule ... need to lock */ |
| 2244 | spin_lock_irqsave (&ehci->lock, flags); |
Alan Stern | 541c7d4 | 2010-06-22 16:39:10 -0400 | [diff] [blame] | 2245 | if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) { |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 2246 | status = -ESHUTDOWN; |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 2247 | goto done_not_linked; |
| 2248 | } |
| 2249 | status = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb); |
| 2250 | if (unlikely(status)) |
| 2251 | goto done_not_linked; |
| 2252 | status = iso_stream_schedule(ehci, urb, stream); |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 2253 | if (status == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2254 | sitd_link_urb (ehci, urb, ehci->periodic_size << 3, stream); |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 2255 | else |
| 2256 | usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb); |
| 2257 | done_not_linked: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2258 | spin_unlock_irqrestore (&ehci->lock, flags); |
| 2259 | |
| 2260 | done: |
| 2261 | if (status < 0) |
| 2262 | iso_stream_put (ehci, stream); |
| 2263 | return status; |
| 2264 | } |
| 2265 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2266 | /*-------------------------------------------------------------------------*/ |
| 2267 | |
Alan Stern | 0e5f231 | 2010-04-08 16:56:37 -0400 | [diff] [blame] | 2268 | static void free_cached_lists(struct ehci_hcd *ehci) |
Karsten Wiese | 9aa09d2 | 2009-02-08 16:07:58 -0800 | [diff] [blame] | 2269 | { |
| 2270 | struct ehci_itd *itd, *n; |
Alan Stern | 0e5f231 | 2010-04-08 16:56:37 -0400 | [diff] [blame] | 2271 | struct ehci_sitd *sitd, *sn; |
Karsten Wiese | 9aa09d2 | 2009-02-08 16:07:58 -0800 | [diff] [blame] | 2272 | |
| 2273 | list_for_each_entry_safe(itd, n, &ehci->cached_itd_list, itd_list) { |
| 2274 | struct ehci_iso_stream *stream = itd->stream; |
| 2275 | itd->stream = NULL; |
| 2276 | list_move(&itd->itd_list, &stream->free_list); |
| 2277 | iso_stream_put(ehci, stream); |
| 2278 | } |
Alan Stern | 0e5f231 | 2010-04-08 16:56:37 -0400 | [diff] [blame] | 2279 | |
| 2280 | list_for_each_entry_safe(sitd, sn, &ehci->cached_sitd_list, sitd_list) { |
| 2281 | struct ehci_iso_stream *stream = sitd->stream; |
| 2282 | sitd->stream = NULL; |
| 2283 | list_move(&sitd->sitd_list, &stream->free_list); |
| 2284 | iso_stream_put(ehci, stream); |
| 2285 | } |
Karsten Wiese | 9aa09d2 | 2009-02-08 16:07:58 -0800 | [diff] [blame] | 2286 | } |
| 2287 | |
| 2288 | /*-------------------------------------------------------------------------*/ |
| 2289 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2290 | static void |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 2291 | scan_periodic (struct ehci_hcd *ehci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2292 | { |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 2293 | unsigned now_uframe, frame, clock, clock_frame, mod; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2294 | unsigned modified; |
| 2295 | |
| 2296 | mod = ehci->periodic_size << 3; |
| 2297 | |
| 2298 | /* |
| 2299 | * When running, scan from last scan point up to "now" |
| 2300 | * else clean up by scanning everything that's left. |
| 2301 | * Touches as few pages as possible: cache-friendly. |
| 2302 | */ |
| 2303 | now_uframe = ehci->next_uframe; |
Alan Stern | e879990 | 2011-08-18 16:31:30 -0400 | [diff] [blame] | 2304 | if (ehci->rh_state == EHCI_RH_RUNNING) { |
Alan Stern | 68aa95d | 2011-10-12 10:39:14 -0400 | [diff] [blame] | 2305 | clock = ehci_read_frame_index(ehci); |
Alan Stern | bccbefa | 2010-07-14 11:03:36 -0400 | [diff] [blame] | 2306 | clock_frame = (clock >> 3) & (ehci->periodic_size - 1); |
Karsten Wiese | 9aa09d2 | 2009-02-08 16:07:58 -0800 | [diff] [blame] | 2307 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2308 | clock = now_uframe + mod - 1; |
Karsten Wiese | 9aa09d2 | 2009-02-08 16:07:58 -0800 | [diff] [blame] | 2309 | clock_frame = -1; |
| 2310 | } |
| 2311 | if (ehci->clock_frame != clock_frame) { |
Alan Stern | 0e5f231 | 2010-04-08 16:56:37 -0400 | [diff] [blame] | 2312 | free_cached_lists(ehci); |
Karsten Wiese | 9aa09d2 | 2009-02-08 16:07:58 -0800 | [diff] [blame] | 2313 | ehci->clock_frame = clock_frame; |
| 2314 | } |
Alan Stern | bccbefa | 2010-07-14 11:03:36 -0400 | [diff] [blame] | 2315 | clock &= mod - 1; |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 2316 | clock_frame = clock >> 3; |
Alan Stern | 1e12c91 | 2011-05-17 10:40:51 -0400 | [diff] [blame] | 2317 | ++ehci->periodic_stamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2318 | |
| 2319 | for (;;) { |
| 2320 | union ehci_shadow q, *q_p; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2321 | __hc32 type, *hw_p; |
David Brownell | 79592b72 | 2008-01-07 00:47:42 -0800 | [diff] [blame] | 2322 | unsigned incomplete = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2323 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2324 | frame = now_uframe >> 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2325 | |
| 2326 | restart: |
| 2327 | /* scan each element in frame's queue for completions */ |
| 2328 | q_p = &ehci->pshadow [frame]; |
| 2329 | hw_p = &ehci->periodic [frame]; |
| 2330 | q.ptr = q_p->ptr; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2331 | type = Q_NEXT_TYPE(ehci, *hw_p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2332 | modified = 0; |
| 2333 | |
| 2334 | while (q.ptr != NULL) { |
| 2335 | unsigned uf; |
| 2336 | union ehci_shadow temp; |
| 2337 | int live; |
| 2338 | |
Alan Stern | e879990 | 2011-08-18 16:31:30 -0400 | [diff] [blame] | 2339 | live = (ehci->rh_state == EHCI_RH_RUNNING); |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2340 | switch (hc32_to_cpu(ehci, type)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2341 | case Q_TYPE_QH: |
| 2342 | /* handle any completions */ |
| 2343 | temp.qh = qh_get (q.qh); |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 2344 | type = Q_NEXT_TYPE(ehci, q.qh->hw->hw_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2345 | q = q.qh->qh_next; |
Alan Stern | 1e12c91 | 2011-05-17 10:40:51 -0400 | [diff] [blame] | 2346 | if (temp.qh->stamp != ehci->periodic_stamp) { |
| 2347 | modified = qh_completions(ehci, temp.qh); |
| 2348 | if (!modified) |
| 2349 | temp.qh->stamp = ehci->periodic_stamp; |
| 2350 | if (unlikely(list_empty(&temp.qh->qtd_list) || |
| 2351 | temp.qh->needs_rescan)) |
| 2352 | intr_deschedule(ehci, temp.qh); |
| 2353 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2354 | qh_put (temp.qh); |
| 2355 | break; |
| 2356 | case Q_TYPE_FSTN: |
| 2357 | /* for "save place" FSTNs, look at QH entries |
| 2358 | * in the previous frame for completions. |
| 2359 | */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2360 | if (q.fstn->hw_prev != EHCI_LIST_END(ehci)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2361 | dbg ("ignoring completions from FSTNs"); |
| 2362 | } |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2363 | type = Q_NEXT_TYPE(ehci, q.fstn->hw_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2364 | q = q.fstn->fstn_next; |
| 2365 | break; |
| 2366 | case Q_TYPE_ITD: |
David Brownell | 79592b72 | 2008-01-07 00:47:42 -0800 | [diff] [blame] | 2367 | /* If this ITD is still active, leave it for |
| 2368 | * later processing ... check the next entry. |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 2369 | * No need to check for activity unless the |
| 2370 | * frame is current. |
David Brownell | 79592b72 | 2008-01-07 00:47:42 -0800 | [diff] [blame] | 2371 | */ |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 2372 | if (frame == clock_frame && live) { |
| 2373 | rmb(); |
| 2374 | for (uf = 0; uf < 8; uf++) { |
| 2375 | if (q.itd->hw_transaction[uf] & |
| 2376 | ITD_ACTIVE(ehci)) |
| 2377 | break; |
| 2378 | } |
| 2379 | if (uf < 8) { |
| 2380 | incomplete = true; |
| 2381 | q_p = &q.itd->itd_next; |
| 2382 | hw_p = &q.itd->hw_next; |
| 2383 | type = Q_NEXT_TYPE(ehci, |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2384 | q.itd->hw_next); |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 2385 | q = *q_p; |
| 2386 | break; |
| 2387 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2388 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2389 | |
David Brownell | 79592b72 | 2008-01-07 00:47:42 -0800 | [diff] [blame] | 2390 | /* Take finished ITDs out of the schedule |
| 2391 | * and process them: recycle, maybe report |
| 2392 | * URB completion. HC won't cache the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2393 | * pointer for much longer, if at all. |
| 2394 | */ |
| 2395 | *q_p = q.itd->itd_next; |
Andiry Xu | 3d091a6 | 2010-11-08 17:58:35 +0800 | [diff] [blame] | 2396 | if (!ehci->use_dummy_qh || |
| 2397 | q.itd->hw_next != EHCI_LIST_END(ehci)) |
| 2398 | *hw_p = q.itd->hw_next; |
| 2399 | else |
| 2400 | *hw_p = ehci->dummy->qh_dma; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2401 | type = Q_NEXT_TYPE(ehci, q.itd->hw_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2402 | wmb(); |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 2403 | modified = itd_complete (ehci, q.itd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2404 | q = *q_p; |
| 2405 | break; |
| 2406 | case Q_TYPE_SITD: |
David Brownell | 79592b72 | 2008-01-07 00:47:42 -0800 | [diff] [blame] | 2407 | /* If this SITD is still active, leave it for |
| 2408 | * later processing ... check the next entry. |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 2409 | * No need to check for activity unless the |
| 2410 | * frame is current. |
David Brownell | 79592b72 | 2008-01-07 00:47:42 -0800 | [diff] [blame] | 2411 | */ |
Dmitri Epshtein | 22e1869 | 2009-12-14 17:17:34 +0200 | [diff] [blame] | 2412 | if (((frame == clock_frame) || |
Alan Stern | bccbefa | 2010-07-14 11:03:36 -0400 | [diff] [blame] | 2413 | (((frame + 1) & (ehci->periodic_size - 1)) |
Dmitri Epshtein | 22e1869 | 2009-12-14 17:17:34 +0200 | [diff] [blame] | 2414 | == clock_frame)) |
| 2415 | && live |
| 2416 | && (q.sitd->hw_results & |
| 2417 | SITD_ACTIVE(ehci))) { |
| 2418 | |
David Brownell | 79592b72 | 2008-01-07 00:47:42 -0800 | [diff] [blame] | 2419 | incomplete = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2420 | q_p = &q.sitd->sitd_next; |
| 2421 | hw_p = &q.sitd->hw_next; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2422 | type = Q_NEXT_TYPE(ehci, |
| 2423 | q.sitd->hw_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2424 | q = *q_p; |
| 2425 | break; |
| 2426 | } |
David Brownell | 79592b72 | 2008-01-07 00:47:42 -0800 | [diff] [blame] | 2427 | |
| 2428 | /* Take finished SITDs out of the schedule |
| 2429 | * and process them: recycle, maybe report |
| 2430 | * URB completion. |
| 2431 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2432 | *q_p = q.sitd->sitd_next; |
Andiry Xu | 3d091a6 | 2010-11-08 17:58:35 +0800 | [diff] [blame] | 2433 | if (!ehci->use_dummy_qh || |
| 2434 | q.sitd->hw_next != EHCI_LIST_END(ehci)) |
| 2435 | *hw_p = q.sitd->hw_next; |
| 2436 | else |
| 2437 | *hw_p = ehci->dummy->qh_dma; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 2438 | type = Q_NEXT_TYPE(ehci, q.sitd->hw_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2439 | wmb(); |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 2440 | modified = sitd_complete (ehci, q.sitd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2441 | q = *q_p; |
| 2442 | break; |
| 2443 | default: |
| 2444 | dbg ("corrupt type %d frame %d shadow %p", |
| 2445 | type, frame, q.ptr); |
| 2446 | // BUG (); |
| 2447 | q.ptr = NULL; |
| 2448 | } |
| 2449 | |
| 2450 | /* assume completion callbacks modify the queue */ |
David Brownell | aa16ca3 | 2007-12-30 23:45:19 -0800 | [diff] [blame] | 2451 | if (unlikely (modified)) { |
| 2452 | if (likely(ehci->periodic_sched > 0)) |
| 2453 | goto restart; |
David Brownell | 01c1714 | 2008-08-26 23:35:04 -0700 | [diff] [blame] | 2454 | /* short-circuit this scan */ |
David Brownell | aa16ca3 | 2007-12-30 23:45:19 -0800 | [diff] [blame] | 2455 | now_uframe = clock; |
| 2456 | break; |
| 2457 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2458 | } |
| 2459 | |
David Brownell | 79592b72 | 2008-01-07 00:47:42 -0800 | [diff] [blame] | 2460 | /* If we can tell we caught up to the hardware, stop now. |
| 2461 | * We can't advance our scan without collecting the ISO |
| 2462 | * transfers that are still pending in this frame. |
| 2463 | */ |
Alan Stern | e879990 | 2011-08-18 16:31:30 -0400 | [diff] [blame] | 2464 | if (incomplete && ehci->rh_state == EHCI_RH_RUNNING) { |
David Brownell | 79592b72 | 2008-01-07 00:47:42 -0800 | [diff] [blame] | 2465 | ehci->next_uframe = now_uframe; |
| 2466 | break; |
| 2467 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2468 | |
| 2469 | // FIXME: this assumes we won't get lapped when |
| 2470 | // latencies climb; that should be rare, but... |
| 2471 | // detect it, and just go all the way around. |
| 2472 | // FLR might help detect this case, so long as latencies |
| 2473 | // don't exceed periodic_size msec (default 1.024 sec). |
| 2474 | |
| 2475 | // FIXME: likewise assumes HC doesn't halt mid-scan |
| 2476 | |
| 2477 | if (now_uframe == clock) { |
| 2478 | unsigned now; |
| 2479 | |
Alan Stern | e879990 | 2011-08-18 16:31:30 -0400 | [diff] [blame] | 2480 | if (ehci->rh_state != EHCI_RH_RUNNING |
David Brownell | aa16ca3 | 2007-12-30 23:45:19 -0800 | [diff] [blame] | 2481 | || ehci->periodic_sched == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2482 | break; |
| 2483 | ehci->next_uframe = now_uframe; |
Alan Stern | 68aa95d | 2011-10-12 10:39:14 -0400 | [diff] [blame] | 2484 | now = ehci_read_frame_index(ehci) & (mod - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2485 | if (now_uframe == now) |
| 2486 | break; |
| 2487 | |
| 2488 | /* rescan the rest of this frame, then ... */ |
| 2489 | clock = now; |
Alan Stern | b40e43f | 2008-05-20 16:59:10 -0400 | [diff] [blame] | 2490 | clock_frame = clock >> 3; |
Karsten Wiese | 9aa09d2 | 2009-02-08 16:07:58 -0800 | [diff] [blame] | 2491 | if (ehci->clock_frame != clock_frame) { |
Alan Stern | 0e5f231 | 2010-04-08 16:56:37 -0400 | [diff] [blame] | 2492 | free_cached_lists(ehci); |
Karsten Wiese | 9aa09d2 | 2009-02-08 16:07:58 -0800 | [diff] [blame] | 2493 | ehci->clock_frame = clock_frame; |
Alan Stern | 1e12c91 | 2011-05-17 10:40:51 -0400 | [diff] [blame] | 2494 | ++ehci->periodic_stamp; |
Karsten Wiese | 9aa09d2 | 2009-02-08 16:07:58 -0800 | [diff] [blame] | 2495 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2496 | } else { |
| 2497 | now_uframe++; |
Alan Stern | bccbefa | 2010-07-14 11:03:36 -0400 | [diff] [blame] | 2498 | now_uframe &= mod - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2499 | } |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 2500 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2501 | } |