Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
David Brownell | d49d431 | 2005-05-07 13:21:50 -0700 | [diff] [blame] | 2 | * Copyright (C) 2001-2004 by David Brownell |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 3 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License as published by the |
| 6 | * Free Software Foundation; either version 2 of the License, or (at your |
| 7 | * option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but |
| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 11 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software Foundation, |
| 16 | * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 17 | */ |
| 18 | |
| 19 | /* this file is part of ehci-hcd.c */ |
| 20 | |
| 21 | /*-------------------------------------------------------------------------*/ |
| 22 | |
| 23 | /* |
| 24 | * EHCI hardware queue manipulation ... the core. QH/QTD manipulation. |
| 25 | * |
| 26 | * Control, bulk, and interrupt traffic all use "qh" lists. They list "qtd" |
| 27 | * entries describing USB transactions, max 16-20kB/entry (with 4kB-aligned |
| 28 | * buffers needed for the larger number). We use one QH per endpoint, queue |
| 29 | * multiple urbs (all three types) per endpoint. URBs may need several qtds. |
| 30 | * |
| 31 | * ISO traffic uses "ISO TD" (itd, and sitd) records, and (along with |
| 32 | * interrupts) needs careful scheduling. Performance improvements can be |
| 33 | * an ongoing challenge. That's in "ehci-sched.c". |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 34 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | * USB 1.1 devices are handled (a) by "companion" OHCI or UHCI root hubs, |
| 36 | * or otherwise through transaction translators (TTs) in USB 2.0 hubs using |
| 37 | * (b) special fields in qh entries or (c) split iso entries. TTs will |
| 38 | * buffer low/full speed data so the host collects it at high speed. |
| 39 | */ |
| 40 | |
| 41 | /*-------------------------------------------------------------------------*/ |
| 42 | |
| 43 | /* fill a qtd, returning how much of the buffer we were able to queue up */ |
| 44 | |
| 45 | static int |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 46 | qtd_fill(struct ehci_hcd *ehci, struct ehci_qtd *qtd, dma_addr_t buf, |
| 47 | size_t len, int token, int maxpacket) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | { |
| 49 | int i, count; |
| 50 | u64 addr = buf; |
| 51 | |
| 52 | /* one buffer entry per 4K ... first might be short or unaligned */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 53 | qtd->hw_buf[0] = cpu_to_hc32(ehci, (u32)addr); |
| 54 | qtd->hw_buf_hi[0] = cpu_to_hc32(ehci, (u32)(addr >> 32)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | count = 0x1000 - (buf & 0x0fff); /* rest of that page */ |
| 56 | if (likely (len < count)) /* ... iff needed */ |
| 57 | count = len; |
| 58 | else { |
| 59 | buf += 0x1000; |
| 60 | buf &= ~0x0fff; |
| 61 | |
| 62 | /* per-qtd limit: from 16K to 20K (best alignment) */ |
| 63 | for (i = 1; count < len && i < 5; i++) { |
| 64 | addr = buf; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 65 | qtd->hw_buf[i] = cpu_to_hc32(ehci, (u32)addr); |
| 66 | qtd->hw_buf_hi[i] = cpu_to_hc32(ehci, |
| 67 | (u32)(addr >> 32)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | buf += 0x1000; |
| 69 | if ((count + 0x1000) < len) |
| 70 | count += 0x1000; |
| 71 | else |
| 72 | count = len; |
| 73 | } |
| 74 | |
| 75 | /* short packets may only terminate transfers */ |
| 76 | if (count != len) |
| 77 | count -= (count % maxpacket); |
| 78 | } |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 79 | qtd->hw_token = cpu_to_hc32(ehci, (count << 16) | token); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | qtd->length = count; |
| 81 | |
| 82 | return count; |
| 83 | } |
| 84 | |
| 85 | /*-------------------------------------------------------------------------*/ |
| 86 | |
| 87 | static inline void |
| 88 | qh_update (struct ehci_hcd *ehci, struct ehci_qh *qh, struct ehci_qtd *qtd) |
| 89 | { |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 90 | struct ehci_qh_hw *hw = qh->hw; |
| 91 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | /* writes to an active overlay are unsafe */ |
Alan Stern | c1fdb68 | 2013-03-22 13:30:43 -0400 | [diff] [blame] | 93 | WARN_ON(qh->qh_state != QH_STATE_IDLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 95 | hw->hw_qtd_next = QTD_NEXT(ehci, qtd->qtd_dma); |
| 96 | hw->hw_alt_next = EHCI_LIST_END(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Alan Stern | a455212d | 2009-06-11 14:56:22 -0400 | [diff] [blame] | 98 | /* Except for control endpoints, we make hardware maintain data |
| 99 | * toggle (like OHCI) ... here (re)initialize the toggle in the QH, |
| 100 | * and set the pseudo-toggle in udev. Only usb_clear_halt() will |
| 101 | * ever clear it. |
| 102 | */ |
Alan Stern | 4c53de7 | 2012-07-11 11:21:32 -0400 | [diff] [blame] | 103 | if (!(hw->hw_info1 & cpu_to_hc32(ehci, QH_TOGGLE_CTL))) { |
Alan Stern | a455212d | 2009-06-11 14:56:22 -0400 | [diff] [blame] | 104 | unsigned is_out, epnum; |
| 105 | |
Alan Stern | e04f5f7 | 2011-07-19 14:01:23 -0400 | [diff] [blame] | 106 | is_out = qh->is_out; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 107 | epnum = (hc32_to_cpup(ehci, &hw->hw_info1) >> 8) & 0x0f; |
Alan Stern | a455212d | 2009-06-11 14:56:22 -0400 | [diff] [blame] | 108 | if (unlikely (!usb_gettoggle (qh->dev, epnum, is_out))) { |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 109 | hw->hw_token &= ~cpu_to_hc32(ehci, QTD_TOGGLE); |
Alan Stern | a455212d | 2009-06-11 14:56:22 -0400 | [diff] [blame] | 110 | usb_settoggle (qh->dev, epnum, is_out, 1); |
| 111 | } |
| 112 | } |
| 113 | |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 114 | hw->hw_token &= cpu_to_hc32(ehci, QTD_TOGGLE | QTD_STS_PING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | } |
| 116 | |
| 117 | /* if it weren't for a common silicon quirk (writing the dummy into the qh |
| 118 | * overlay, so qh->hw_token wrongly becomes inactive/halted), only fault |
| 119 | * recovery (including urb dequeue) would need software changes to a QH... |
| 120 | */ |
| 121 | static void |
| 122 | qh_refresh (struct ehci_hcd *ehci, struct ehci_qh *qh) |
| 123 | { |
| 124 | struct ehci_qtd *qtd; |
| 125 | |
Alan Stern | c1fdb68 | 2013-03-22 13:30:43 -0400 | [diff] [blame] | 126 | qtd = list_entry(qh->qtd_list.next, struct ehci_qtd, qtd_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
Alan Stern | c1fdb68 | 2013-03-22 13:30:43 -0400 | [diff] [blame] | 128 | /* |
| 129 | * first qtd may already be partially processed. |
| 130 | * If we come here during unlink, the QH overlay region |
| 131 | * might have reference to the just unlinked qtd. The |
| 132 | * qtd is updated in qh_completions(). Update the QH |
| 133 | * overlay here. |
| 134 | */ |
| 135 | if (qh->hw->hw_token & ACTIVE_BIT(ehci)) |
| 136 | qh->hw->hw_qtd_next = qtd->hw_next; |
| 137 | else |
| 138 | qh_update(ehci, qh, qtd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | } |
| 140 | |
| 141 | /*-------------------------------------------------------------------------*/ |
| 142 | |
Alan Stern | 914b701 | 2009-06-29 10:47:30 -0400 | [diff] [blame] | 143 | static void qh_link_async(struct ehci_hcd *ehci, struct ehci_qh *qh); |
| 144 | |
| 145 | static void ehci_clear_tt_buffer_complete(struct usb_hcd *hcd, |
| 146 | struct usb_host_endpoint *ep) |
| 147 | { |
| 148 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); |
| 149 | struct ehci_qh *qh = ep->hcpriv; |
| 150 | unsigned long flags; |
| 151 | |
| 152 | spin_lock_irqsave(&ehci->lock, flags); |
| 153 | qh->clearing_tt = 0; |
| 154 | if (qh->qh_state == QH_STATE_IDLE && !list_empty(&qh->qtd_list) |
Alan Stern | e879990 | 2011-08-18 16:31:30 -0400 | [diff] [blame] | 155 | && ehci->rh_state == EHCI_RH_RUNNING) |
Alan Stern | 914b701 | 2009-06-29 10:47:30 -0400 | [diff] [blame] | 156 | qh_link_async(ehci, qh); |
| 157 | spin_unlock_irqrestore(&ehci->lock, flags); |
| 158 | } |
| 159 | |
| 160 | static void ehci_clear_tt_buffer(struct ehci_hcd *ehci, struct ehci_qh *qh, |
| 161 | struct urb *urb, u32 token) |
| 162 | { |
| 163 | |
| 164 | /* If an async split transaction gets an error or is unlinked, |
| 165 | * the TT buffer may be left in an indeterminate state. We |
| 166 | * have to clear the TT buffer. |
| 167 | * |
| 168 | * Note: this routine is never called for Isochronous transfers. |
| 169 | */ |
| 170 | if (urb->dev->tt && !usb_pipeint(urb->pipe) && !qh->clearing_tt) { |
| 171 | #ifdef DEBUG |
| 172 | struct usb_device *tt = urb->dev->tt->hub; |
| 173 | dev_dbg(&tt->dev, |
| 174 | "clear tt buffer port %d, a%d ep%d t%08x\n", |
| 175 | urb->dev->ttport, urb->dev->devnum, |
| 176 | usb_pipeendpoint(urb->pipe), token); |
| 177 | #endif /* DEBUG */ |
| 178 | if (!ehci_is_TDI(ehci) |
| 179 | || urb->dev->tt->hub != |
| 180 | ehci_to_hcd(ehci)->self.root_hub) { |
| 181 | if (usb_hub_clear_tt_buffer(urb) == 0) |
| 182 | qh->clearing_tt = 1; |
| 183 | } else { |
| 184 | |
| 185 | /* REVISIT ARC-derived cores don't clear the root |
| 186 | * hub TT buffer in this way... |
| 187 | */ |
| 188 | } |
| 189 | } |
| 190 | } |
| 191 | |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 192 | static int qtd_copy_status ( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | struct ehci_hcd *ehci, |
| 194 | struct urb *urb, |
| 195 | size_t length, |
| 196 | u32 token |
| 197 | ) |
| 198 | { |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 199 | int status = -EINPROGRESS; |
| 200 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | /* count IN/OUT bytes, not SETUP (even short packets) */ |
| 202 | if (likely (QTD_PID (token) != 2)) |
| 203 | urb->actual_length += length - QTD_LENGTH (token); |
| 204 | |
| 205 | /* don't modify error codes */ |
Alan Stern | eb23105 | 2007-08-21 15:40:36 -0400 | [diff] [blame] | 206 | if (unlikely(urb->unlinked)) |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 207 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | |
| 209 | /* force cleanup after short read; not always an error */ |
| 210 | if (unlikely (IS_SHORT_READ (token))) |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 211 | status = -EREMOTEIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
| 213 | /* serious "can't proceed" faults reported by the hardware */ |
| 214 | if (token & QTD_STS_HALT) { |
| 215 | if (token & QTD_STS_BABBLE) { |
| 216 | /* FIXME "must" disable babbling device's port too */ |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 217 | status = -EOVERFLOW; |
Alan Stern | ba516de | 2009-06-29 17:36:14 -0400 | [diff] [blame] | 218 | /* CERR nonzero + halt --> stall */ |
| 219 | } else if (QTD_CERR(token)) { |
| 220 | status = -EPIPE; |
| 221 | |
| 222 | /* In theory, more than one of the following bits can be set |
| 223 | * since they are sticky and the transaction is retried. |
| 224 | * Which to test first is rather arbitrary. |
| 225 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | } else if (token & QTD_STS_MMF) { |
| 227 | /* fs/ls interrupt xfer missed the complete-split */ |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 228 | status = -EPROTO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | } else if (token & QTD_STS_DBE) { |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 230 | status = (QTD_PID (token) == 1) /* IN ? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | ? -ENOSR /* hc couldn't read data */ |
| 232 | : -ECOMM; /* hc couldn't write data */ |
| 233 | } else if (token & QTD_STS_XACT) { |
Alan Stern | ba516de | 2009-06-29 17:36:14 -0400 | [diff] [blame] | 234 | /* timeout, bad CRC, wrong PID, etc */ |
| 235 | ehci_dbg(ehci, "devpath %s ep%d%s 3strikes\n", |
| 236 | urb->dev->devpath, |
| 237 | usb_pipeendpoint(urb->pipe), |
| 238 | usb_pipein(urb->pipe) ? "in" : "out"); |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 239 | status = -EPROTO; |
Alan Stern | ba516de | 2009-06-29 17:36:14 -0400 | [diff] [blame] | 240 | } else { /* unknown */ |
| 241 | status = -EPROTO; |
| 242 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
| 244 | ehci_vdbg (ehci, |
| 245 | "dev%d ep%d%s qtd token %08x --> status %d\n", |
| 246 | usb_pipedevice (urb->pipe), |
| 247 | usb_pipeendpoint (urb->pipe), |
| 248 | usb_pipein (urb->pipe) ? "in" : "out", |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 249 | token, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | } |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 251 | |
| 252 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | } |
| 254 | |
| 255 | static void |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 256 | ehci_urb_done(struct ehci_hcd *ehci, struct urb *urb, int status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | __releases(ehci->lock) |
| 258 | __acquires(ehci->lock) |
| 259 | { |
Alan Stern | 2656a9a | 2012-11-08 10:17:01 -0500 | [diff] [blame] | 260 | if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT) { |
| 261 | /* ... update hc-wide periodic stats */ |
| 262 | ehci_to_hcd(ehci)->self.bandwidth_int_reqs--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | } |
| 264 | |
Alan Stern | eb23105 | 2007-08-21 15:40:36 -0400 | [diff] [blame] | 265 | if (unlikely(urb->unlinked)) { |
| 266 | COUNT(ehci->stats.unlink); |
| 267 | } else { |
David Brownell | 4f66762 | 2008-04-12 08:32:05 -0700 | [diff] [blame] | 268 | /* report non-error and short read status as zero */ |
| 269 | if (status == -EINPROGRESS || status == -EREMOTEIO) |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 270 | status = 0; |
Alan Stern | eb23105 | 2007-08-21 15:40:36 -0400 | [diff] [blame] | 271 | COUNT(ehci->stats.complete); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | |
| 274 | #ifdef EHCI_URB_TRACE |
| 275 | ehci_dbg (ehci, |
| 276 | "%s %s urb %p ep%d%s status %d len %d/%d\n", |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 277 | __func__, urb->dev->devpath, urb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | usb_pipeendpoint (urb->pipe), |
| 279 | usb_pipein (urb->pipe) ? "in" : "out", |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 280 | status, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | urb->actual_length, urb->transfer_buffer_length); |
| 282 | #endif |
| 283 | |
| 284 | /* complete() can reenter this HCD */ |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 285 | usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | spin_unlock (&ehci->lock); |
Alan Stern | 4a00027 | 2007-08-24 15:42:24 -0400 | [diff] [blame] | 287 | usb_hcd_giveback_urb(ehci_to_hcd(ehci), urb, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | spin_lock (&ehci->lock); |
| 289 | } |
| 290 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | static int qh_schedule (struct ehci_hcd *ehci, struct ehci_qh *qh); |
| 292 | |
| 293 | /* |
| 294 | * Process and free completed qtds for a qh, returning URBs to drivers. |
Alan Stern | 79bcf7b | 2013-03-22 13:30:56 -0400 | [diff] [blame^] | 295 | * Chases up to qh->hw_current. Returns nonzero if the caller should |
| 296 | * unlink qh. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | static unsigned |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 299 | qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | { |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 301 | struct ehci_qtd *last, *end = qh->dummy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | struct list_head *entry, *tmp; |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 303 | int last_status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | int stopped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | u8 state; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 306 | struct ehci_qh_hw *hw = qh->hw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | /* completions (or tasks on other cpus) must never clobber HALT |
| 309 | * till we've gone through and cleaned everything up, even when |
| 310 | * they add urbs to this qh's queue or mark them for unlinking. |
| 311 | * |
| 312 | * NOTE: unlinking expects to be done in queue order. |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 313 | * |
| 314 | * It's a bug for qh->qh_state to be anything other than |
| 315 | * QH_STATE_IDLE, unless our caller is scan_async() or |
Alan Stern | 569b394 | 2012-07-11 11:23:00 -0400 | [diff] [blame] | 316 | * scan_intr(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | */ |
| 318 | state = qh->qh_state; |
| 319 | qh->qh_state = QH_STATE_COMPLETING; |
| 320 | stopped = (state == QH_STATE_IDLE); |
| 321 | |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 322 | rescan: |
| 323 | last = NULL; |
| 324 | last_status = -EINPROGRESS; |
| 325 | qh->needs_rescan = 0; |
| 326 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | /* remove de-activated QTDs from front of queue. |
| 328 | * after faults (including short reads), cleanup this urb |
| 329 | * then let the queue advance. |
| 330 | * if queue is stopped, handles unlinks. |
| 331 | */ |
| 332 | list_for_each_safe (entry, tmp, &qh->qtd_list) { |
| 333 | struct ehci_qtd *qtd; |
| 334 | struct urb *urb; |
| 335 | u32 token = 0; |
| 336 | |
| 337 | qtd = list_entry (entry, struct ehci_qtd, qtd_list); |
| 338 | urb = qtd->urb; |
| 339 | |
| 340 | /* clean up any state from previous QTD ...*/ |
| 341 | if (last) { |
| 342 | if (likely (last->urb != urb)) { |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 343 | ehci_urb_done(ehci, last->urb, last_status); |
Misha Zhilin | b5f7a0e | 2008-02-27 18:05:24 -0800 | [diff] [blame] | 344 | last_status = -EINPROGRESS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | } |
| 346 | ehci_qtd_free (ehci, last); |
| 347 | last = NULL; |
| 348 | } |
| 349 | |
| 350 | /* ignore urbs submitted during completions we reported */ |
| 351 | if (qtd == end) |
| 352 | break; |
| 353 | |
| 354 | /* hardware copies qtd out of qh overlay */ |
| 355 | rmb (); |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 356 | token = hc32_to_cpu(ehci, qtd->hw_token); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | |
| 358 | /* always clean up qtds the hc de-activated */ |
Alan Stern | a2c2706 | 2009-02-10 10:16:58 -0500 | [diff] [blame] | 359 | retry_xacterr: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | if ((token & QTD_STS_ACTIVE) == 0) { |
| 361 | |
Vikram Pandita | 332960b | 2011-10-30 12:55:09 -0700 | [diff] [blame] | 362 | /* Report Data Buffer Error: non-fatal but useful */ |
| 363 | if (token & QTD_STS_DBE) |
| 364 | ehci_dbg(ehci, |
| 365 | "detected DataBufferErr for urb %p ep%d%s len %d, qtd %p [qh %p]\n", |
| 366 | urb, |
| 367 | usb_endpoint_num(&urb->ep->desc), |
| 368 | usb_endpoint_dir_in(&urb->ep->desc) ? "in" : "out", |
| 369 | urb->transfer_buffer_length, |
| 370 | qtd, |
| 371 | qh); |
| 372 | |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 373 | /* on STALL, error, and short reads this urb must |
| 374 | * complete and all its qtds must be recycled. |
| 375 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | if ((token & QTD_STS_HALT) != 0) { |
Alan Stern | a2c2706 | 2009-02-10 10:16:58 -0500 | [diff] [blame] | 377 | |
| 378 | /* retry transaction errors until we |
| 379 | * reach the software xacterr limit |
| 380 | */ |
| 381 | if ((token & QTD_STS_XACT) && |
| 382 | QTD_CERR(token) == 0 && |
Alan Stern | ef4638f | 2009-07-31 10:41:40 -0400 | [diff] [blame] | 383 | ++qh->xacterrs < QH_XACTERR_MAX && |
Alan Stern | a2c2706 | 2009-02-10 10:16:58 -0500 | [diff] [blame] | 384 | !urb->unlinked) { |
| 385 | ehci_dbg(ehci, |
Randy Dunlap | d062680 | 2009-02-13 11:22:06 -0800 | [diff] [blame] | 386 | "detected XactErr len %zu/%zu retry %d\n", |
Alan Stern | ef4638f | 2009-07-31 10:41:40 -0400 | [diff] [blame] | 387 | qtd->length - QTD_LENGTH(token), qtd->length, qh->xacterrs); |
Alan Stern | a2c2706 | 2009-02-10 10:16:58 -0500 | [diff] [blame] | 388 | |
| 389 | /* reset the token in the qtd and the |
| 390 | * qh overlay (which still contains |
| 391 | * the qtd) so that we pick up from |
| 392 | * where we left off |
| 393 | */ |
| 394 | token &= ~QTD_STS_HALT; |
| 395 | token |= QTD_STS_ACTIVE | |
| 396 | (EHCI_TUNE_CERR << 10); |
| 397 | qtd->hw_token = cpu_to_hc32(ehci, |
| 398 | token); |
| 399 | wmb(); |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 400 | hw->hw_token = cpu_to_hc32(ehci, |
| 401 | token); |
Alan Stern | a2c2706 | 2009-02-10 10:16:58 -0500 | [diff] [blame] | 402 | goto retry_xacterr; |
| 403 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | stopped = 1; |
| 405 | |
| 406 | /* magic dummy for some short reads; qh won't advance. |
| 407 | * that silicon quirk can kick in with this dummy too. |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 408 | * |
| 409 | * other short reads won't stop the queue, including |
| 410 | * control transfers (status stage handles that) or |
| 411 | * most other single-qtd reads ... the queue stops if |
| 412 | * URB_SHORT_NOT_OK was set so the driver submitting |
| 413 | * the urbs could clean it up. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | */ |
| 415 | } else if (IS_SHORT_READ (token) |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 416 | && !(qtd->hw_alt_next |
| 417 | & EHCI_LIST_END(ehci))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | stopped = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | } |
| 420 | |
| 421 | /* stop scanning when we reach qtds the hc is using */ |
| 422 | } else if (likely (!stopped |
Alan Stern | c0c53db | 2012-07-11 11:21:48 -0400 | [diff] [blame] | 423 | && ehci->rh_state >= EHCI_RH_RUNNING)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | break; |
| 425 | |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 426 | /* scan the whole queue for unlinks whenever it stops */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | } else { |
| 428 | stopped = 1; |
| 429 | |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 430 | /* cancel everything if we halt, suspend, etc */ |
Alan Stern | c0c53db | 2012-07-11 11:21:48 -0400 | [diff] [blame] | 431 | if (ehci->rh_state < EHCI_RH_RUNNING) |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 432 | last_status = -ESHUTDOWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 434 | /* this qtd is active; skip it unless a previous qtd |
| 435 | * for its urb faulted, or its urb was canceled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | */ |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 437 | else if (last_status == -EINPROGRESS && !urb->unlinked) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | continue; |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 439 | |
Alan Stern | feca774 | 2013-03-01 10:51:15 -0500 | [diff] [blame] | 440 | /* |
| 441 | * If this was the active qtd when the qh was unlinked |
| 442 | * and the overlay's token is active, then the overlay |
| 443 | * hasn't been written back to the qtd yet so use its |
| 444 | * token instead of the qtd's. After the qtd is |
| 445 | * processed and removed, the overlay won't be valid |
| 446 | * any more. |
| 447 | */ |
| 448 | if (state == QH_STATE_IDLE && |
| 449 | qh->qtd_list.next == &qtd->qtd_list && |
| 450 | (hw->hw_token & ACTIVE_BIT(ehci))) { |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 451 | token = hc32_to_cpu(ehci, hw->hw_token); |
Alan Stern | feca774 | 2013-03-01 10:51:15 -0500 | [diff] [blame] | 452 | hw->hw_token &= ~ACTIVE_BIT(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | |
Alan Stern | 914b701 | 2009-06-29 10:47:30 -0400 | [diff] [blame] | 454 | /* An unlink may leave an incomplete |
| 455 | * async transaction in the TT buffer. |
| 456 | * We have to clear it. |
| 457 | */ |
| 458 | ehci_clear_tt_buffer(ehci, qh, urb, token); |
| 459 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | } |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 461 | |
David Brownell | 4f66762 | 2008-04-12 08:32:05 -0700 | [diff] [blame] | 462 | /* unless we already know the urb's status, collect qtd status |
| 463 | * and update count of bytes transferred. in common short read |
| 464 | * cases with only one data qtd (including control transfers), |
| 465 | * queue processing won't halt. but with two or more qtds (for |
| 466 | * example, with a 32 KB transfer), when the first qtd gets a |
| 467 | * short read the second must be removed by hand. |
| 468 | */ |
| 469 | if (last_status == -EINPROGRESS) { |
| 470 | last_status = qtd_copy_status(ehci, urb, |
| 471 | qtd->length, token); |
| 472 | if (last_status == -EREMOTEIO |
| 473 | && (qtd->hw_alt_next |
| 474 | & EHCI_LIST_END(ehci))) |
| 475 | last_status = -EINPROGRESS; |
Alan Stern | 914b701 | 2009-06-29 10:47:30 -0400 | [diff] [blame] | 476 | |
| 477 | /* As part of low/full-speed endpoint-halt processing |
| 478 | * we must clear the TT buffer (11.17.5). |
| 479 | */ |
| 480 | if (unlikely(last_status != -EINPROGRESS && |
Alan Stern | c2f6595 | 2009-11-18 11:37:15 -0500 | [diff] [blame] | 481 | last_status != -EREMOTEIO)) { |
| 482 | /* The TT's in some hubs malfunction when they |
| 483 | * receive this request following a STALL (they |
| 484 | * stop sending isochronous packets). Since a |
| 485 | * STALL can't leave the TT buffer in a busy |
| 486 | * state (if you believe Figures 11-48 - 11-51 |
| 487 | * in the USB 2.0 spec), we won't clear the TT |
| 488 | * buffer in this case. Strictly speaking this |
| 489 | * is a violation of the spec. |
| 490 | */ |
| 491 | if (last_status != -EPIPE) |
| 492 | ehci_clear_tt_buffer(ehci, qh, urb, |
| 493 | token); |
| 494 | } |
Alan Stern | b0d9efb | 2007-08-21 15:39:21 -0400 | [diff] [blame] | 495 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 497 | /* if we're removing something not at the queue head, |
| 498 | * patch the hardware queue pointer. |
| 499 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | if (stopped && qtd->qtd_list.prev != &qh->qtd_list) { |
| 501 | last = list_entry (qtd->qtd_list.prev, |
| 502 | struct ehci_qtd, qtd_list); |
| 503 | last->hw_next = qtd->hw_next; |
| 504 | } |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 505 | |
| 506 | /* remove qtd; it's recycled after possible urb completion */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | list_del (&qtd->qtd_list); |
| 508 | last = qtd; |
Alan Stern | a2c2706 | 2009-02-10 10:16:58 -0500 | [diff] [blame] | 509 | |
| 510 | /* reinit the xacterr counter for the next qtd */ |
Alan Stern | ef4638f | 2009-07-31 10:41:40 -0400 | [diff] [blame] | 511 | qh->xacterrs = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | } |
| 513 | |
| 514 | /* last urb's completion might still need calling */ |
| 515 | if (likely (last != NULL)) { |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 516 | ehci_urb_done(ehci, last->urb, last_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | ehci_qtd_free (ehci, last); |
| 518 | } |
| 519 | |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 520 | /* Do we need to rescan for URBs dequeued during a giveback? */ |
| 521 | if (unlikely(qh->needs_rescan)) { |
| 522 | /* If the QH is already unlinked, do the rescan now. */ |
| 523 | if (state == QH_STATE_IDLE) |
| 524 | goto rescan; |
| 525 | |
| 526 | /* Otherwise we have to wait until the QH is fully unlinked. |
| 527 | * Our caller will start an unlink if qh->needs_rescan is |
| 528 | * set. But if an unlink has already started, nothing needs |
| 529 | * to be done. |
| 530 | */ |
| 531 | if (state != QH_STATE_LINKED) |
| 532 | qh->needs_rescan = 0; |
| 533 | } |
| 534 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | /* restore original state; caller must unlink or relink */ |
| 536 | qh->qh_state = state; |
| 537 | |
| 538 | /* be sure the hardware's done with the qh before refreshing |
| 539 | * it after fault cleanup, or recovering from silicon wrongly |
| 540 | * overlaying the dummy qtd (which reduces DMA chatter). |
| 541 | */ |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 542 | if (stopped != 0 || hw->hw_qtd_next == EHCI_LIST_END(ehci)) { |
Alan Stern | c1fdb68 | 2013-03-22 13:30:43 -0400 | [diff] [blame] | 543 | if (state == QH_STATE_LINKED) { |
| 544 | /* |
| 545 | * We won't refresh a QH that's linked (after the HC |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 546 | * stopped the queue). That avoids a race: |
| 547 | * - HC reads first part of QH; |
| 548 | * - CPU updates that first part and the token; |
| 549 | * - HC reads rest of that QH, including token |
| 550 | * Result: HC gets an inconsistent image, and then |
| 551 | * DMAs to/from the wrong memory (corrupting it). |
| 552 | * |
| 553 | * That should be rare for interrupt transfers, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | * except maybe high bandwidth ... |
Alan Stern | c1fdb68 | 2013-03-22 13:30:43 -0400 | [diff] [blame] | 555 | * |
| 556 | * Therefore tell the caller to start an unlink. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | */ |
Alan Stern | a448c9d | 2009-08-19 12:22:44 -0400 | [diff] [blame] | 558 | qh->needs_rescan = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | } |
Alan Stern | c1fdb68 | 2013-03-22 13:30:43 -0400 | [diff] [blame] | 560 | /* otherwise, unlink already started */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | } |
| 562 | |
Alan Stern | 79bcf7b | 2013-03-22 13:30:56 -0400 | [diff] [blame^] | 563 | return qh->needs_rescan; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | } |
| 565 | |
| 566 | /*-------------------------------------------------------------------------*/ |
| 567 | |
| 568 | // high bandwidth multiplier, as encoded in highspeed endpoint descriptors |
| 569 | #define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03)) |
| 570 | // ... and packet size, for any kind of endpoint descriptor |
| 571 | #define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff) |
| 572 | |
| 573 | /* |
| 574 | * reverse of qh_urb_transaction: free a list of TDs. |
| 575 | * used for cleanup after errors, before HC sees an URB's TDs. |
| 576 | */ |
| 577 | static void qtd_list_free ( |
| 578 | struct ehci_hcd *ehci, |
| 579 | struct urb *urb, |
| 580 | struct list_head *qtd_list |
| 581 | ) { |
| 582 | struct list_head *entry, *temp; |
| 583 | |
| 584 | list_for_each_safe (entry, temp, qtd_list) { |
| 585 | struct ehci_qtd *qtd; |
| 586 | |
| 587 | qtd = list_entry (entry, struct ehci_qtd, qtd_list); |
| 588 | list_del (&qtd->qtd_list); |
| 589 | ehci_qtd_free (ehci, qtd); |
| 590 | } |
| 591 | } |
| 592 | |
| 593 | /* |
| 594 | * create a list of filled qtds for this URB; won't link into qh. |
| 595 | */ |
| 596 | static struct list_head * |
| 597 | qh_urb_transaction ( |
| 598 | struct ehci_hcd *ehci, |
| 599 | struct urb *urb, |
| 600 | struct list_head *head, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 601 | gfp_t flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | ) { |
| 603 | struct ehci_qtd *qtd, *qtd_prev; |
| 604 | dma_addr_t buf; |
Alan Stern | 40f8db8 | 2009-11-06 12:29:40 -0500 | [diff] [blame] | 605 | int len, this_sg_len, maxpacket; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | int is_input; |
| 607 | u32 token; |
Alan Stern | 40f8db8 | 2009-11-06 12:29:40 -0500 | [diff] [blame] | 608 | int i; |
| 609 | struct scatterlist *sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | |
| 611 | /* |
| 612 | * URBs map to sequences of QTDs: one logical transaction |
| 613 | */ |
| 614 | qtd = ehci_qtd_alloc (ehci, flags); |
| 615 | if (unlikely (!qtd)) |
| 616 | return NULL; |
| 617 | list_add_tail (&qtd->qtd_list, head); |
| 618 | qtd->urb = urb; |
| 619 | |
| 620 | token = QTD_STS_ACTIVE; |
| 621 | token |= (EHCI_TUNE_CERR << 10); |
| 622 | /* for split transactions, SplitXState initialized to zero */ |
| 623 | |
| 624 | len = urb->transfer_buffer_length; |
| 625 | is_input = usb_pipein (urb->pipe); |
| 626 | if (usb_pipecontrol (urb->pipe)) { |
| 627 | /* SETUP pid */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 628 | qtd_fill(ehci, qtd, urb->setup_dma, |
| 629 | sizeof (struct usb_ctrlrequest), |
| 630 | token | (2 /* "setup" */ << 8), 8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | |
| 632 | /* ... and always at least one more pid */ |
| 633 | token ^= QTD_TOGGLE; |
| 634 | qtd_prev = qtd; |
| 635 | qtd = ehci_qtd_alloc (ehci, flags); |
| 636 | if (unlikely (!qtd)) |
| 637 | goto cleanup; |
| 638 | qtd->urb = urb; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 639 | qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | list_add_tail (&qtd->qtd_list, head); |
Alan Stern | 6912354 | 2005-11-03 11:44:49 -0500 | [diff] [blame] | 641 | |
| 642 | /* for zero length DATA stages, STATUS is always IN */ |
| 643 | if (len == 0) |
| 644 | token |= (1 /* "in" */ << 8); |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 645 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | |
| 647 | /* |
| 648 | * data transfer stage: buffer setup |
| 649 | */ |
Clemens Ladisch | bc677d5 | 2011-12-03 23:41:31 +0100 | [diff] [blame] | 650 | i = urb->num_mapped_sgs; |
Alan Stern | 40f8db8 | 2009-11-06 12:29:40 -0500 | [diff] [blame] | 651 | if (len > 0 && i > 0) { |
Matthew Wilcox | 910f8d0 | 2010-05-01 12:20:01 -0600 | [diff] [blame] | 652 | sg = urb->sg; |
Alan Stern | 40f8db8 | 2009-11-06 12:29:40 -0500 | [diff] [blame] | 653 | buf = sg_dma_address(sg); |
| 654 | |
| 655 | /* urb->transfer_buffer_length may be smaller than the |
| 656 | * size of the scatterlist (or vice versa) |
| 657 | */ |
| 658 | this_sg_len = min_t(int, sg_dma_len(sg), len); |
| 659 | } else { |
| 660 | sg = NULL; |
| 661 | buf = urb->transfer_dma; |
| 662 | this_sg_len = len; |
| 663 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | |
Alan Stern | 6912354 | 2005-11-03 11:44:49 -0500 | [diff] [blame] | 665 | if (is_input) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | token |= (1 /* "in" */ << 8); |
| 667 | /* else it's already initted to "out" pid (0 << 8) */ |
| 668 | |
| 669 | maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input)); |
| 670 | |
| 671 | /* |
| 672 | * buffer gets wrapped in one or more qtds; |
| 673 | * last one may be "short" (including zero len) |
| 674 | * and may serve as a control status ack |
| 675 | */ |
| 676 | for (;;) { |
| 677 | int this_qtd_len; |
| 678 | |
Alan Stern | 40f8db8 | 2009-11-06 12:29:40 -0500 | [diff] [blame] | 679 | this_qtd_len = qtd_fill(ehci, qtd, buf, this_sg_len, token, |
| 680 | maxpacket); |
| 681 | this_sg_len -= this_qtd_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | len -= this_qtd_len; |
| 683 | buf += this_qtd_len; |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 684 | |
| 685 | /* |
| 686 | * short reads advance to a "magic" dummy instead of the next |
| 687 | * qtd ... that forces the queue to stop, for manual cleanup. |
| 688 | * (this will usually be overridden later.) |
| 689 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | if (is_input) |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 691 | qtd->hw_alt_next = ehci->async->hw->hw_alt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | |
| 693 | /* qh makes control packets use qtd toggle; maybe switch it */ |
| 694 | if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0) |
| 695 | token ^= QTD_TOGGLE; |
| 696 | |
Alan Stern | 40f8db8 | 2009-11-06 12:29:40 -0500 | [diff] [blame] | 697 | if (likely(this_sg_len <= 0)) { |
| 698 | if (--i <= 0 || len <= 0) |
| 699 | break; |
| 700 | sg = sg_next(sg); |
| 701 | buf = sg_dma_address(sg); |
| 702 | this_sg_len = min_t(int, sg_dma_len(sg), len); |
| 703 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | |
| 705 | qtd_prev = qtd; |
| 706 | qtd = ehci_qtd_alloc (ehci, flags); |
| 707 | if (unlikely (!qtd)) |
| 708 | goto cleanup; |
| 709 | qtd->urb = urb; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 710 | qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | list_add_tail (&qtd->qtd_list, head); |
| 712 | } |
| 713 | |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 714 | /* |
| 715 | * unless the caller requires manual cleanup after short reads, |
| 716 | * have the alt_next mechanism keep the queue running after the |
| 717 | * last data qtd (the only one, for control and most other cases). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | */ |
| 719 | if (likely ((urb->transfer_flags & URB_SHORT_NOT_OK) == 0 |
| 720 | || usb_pipecontrol (urb->pipe))) |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 721 | qtd->hw_alt_next = EHCI_LIST_END(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | |
| 723 | /* |
| 724 | * control requests may need a terminating data "status" ack; |
Ming Lei | 9a971dd | 2011-09-05 21:05:56 +0800 | [diff] [blame] | 725 | * other OUT ones may need a terminating short packet |
| 726 | * (zero length). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | */ |
Alan Stern | 6912354 | 2005-11-03 11:44:49 -0500 | [diff] [blame] | 728 | if (likely (urb->transfer_buffer_length != 0)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | int one_more = 0; |
| 730 | |
| 731 | if (usb_pipecontrol (urb->pipe)) { |
| 732 | one_more = 1; |
| 733 | token ^= 0x0100; /* "in" <--> "out" */ |
| 734 | token |= QTD_TOGGLE; /* force DATA1 */ |
Ming Lei | 9a971dd | 2011-09-05 21:05:56 +0800 | [diff] [blame] | 735 | } else if (usb_pipeout(urb->pipe) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | && (urb->transfer_flags & URB_ZERO_PACKET) |
| 737 | && !(urb->transfer_buffer_length % maxpacket)) { |
| 738 | one_more = 1; |
| 739 | } |
| 740 | if (one_more) { |
| 741 | qtd_prev = qtd; |
| 742 | qtd = ehci_qtd_alloc (ehci, flags); |
| 743 | if (unlikely (!qtd)) |
| 744 | goto cleanup; |
| 745 | qtd->urb = urb; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 746 | qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | list_add_tail (&qtd->qtd_list, head); |
| 748 | |
| 749 | /* never any data in such packets */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 750 | qtd_fill(ehci, qtd, 0, 0, token, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | } |
| 752 | } |
| 753 | |
| 754 | /* by default, enable interrupt on urb completion */ |
| 755 | if (likely (!(urb->transfer_flags & URB_NO_INTERRUPT))) |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 756 | qtd->hw_token |= cpu_to_hc32(ehci, QTD_IOC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | return head; |
| 758 | |
| 759 | cleanup: |
| 760 | qtd_list_free (ehci, urb, head); |
| 761 | return NULL; |
| 762 | } |
| 763 | |
| 764 | /*-------------------------------------------------------------------------*/ |
| 765 | |
| 766 | // Would be best to create all qh's from config descriptors, |
| 767 | // when each interface/altsetting is established. Unlink |
| 768 | // any previous qh and cancel its urbs first; endpoints are |
| 769 | // implicitly reset then (data toggle too). |
| 770 | // That'd mean updating how usbcore talks to HCDs. (2.7?) |
| 771 | |
| 772 | |
| 773 | /* |
| 774 | * Each QH holds a qtd list; a QH is used for everything except iso. |
| 775 | * |
| 776 | * For interrupt urbs, the scheduler must set the microframe scheduling |
| 777 | * mask(s) each time the QH gets scheduled. For highspeed, that's |
| 778 | * just one microframe in the s-mask. For split interrupt transactions |
| 779 | * there are additional complications: c-mask, maybe FSTNs. |
| 780 | */ |
| 781 | static struct ehci_qh * |
| 782 | qh_make ( |
| 783 | struct ehci_hcd *ehci, |
| 784 | struct urb *urb, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 785 | gfp_t flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | ) { |
| 787 | struct ehci_qh *qh = ehci_qh_alloc (ehci, flags); |
| 788 | u32 info1 = 0, info2 = 0; |
| 789 | int is_input, type; |
| 790 | int maxp = 0; |
David Brownell | 340ba5f | 2007-12-19 11:30:39 -0800 | [diff] [blame] | 791 | struct usb_tt *tt = urb->dev->tt; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 792 | struct ehci_qh_hw *hw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
| 794 | if (!qh) |
| 795 | return qh; |
| 796 | |
| 797 | /* |
| 798 | * init endpoint/device data for this QH |
| 799 | */ |
| 800 | info1 |= usb_pipeendpoint (urb->pipe) << 8; |
| 801 | info1 |= usb_pipedevice (urb->pipe) << 0; |
| 802 | |
| 803 | is_input = usb_pipein (urb->pipe); |
| 804 | type = usb_pipetype (urb->pipe); |
| 805 | maxp = usb_maxpacket (urb->dev, urb->pipe, !is_input); |
| 806 | |
David Brownell | caa9ef6 | 2008-02-08 15:08:44 -0800 | [diff] [blame] | 807 | /* 1024 byte maxpacket is a hardware ceiling. High bandwidth |
| 808 | * acts like up to 3KB, but is built from smaller packets. |
| 809 | */ |
| 810 | if (max_packet(maxp) > 1024) { |
| 811 | ehci_dbg(ehci, "bogus qh maxpacket %d\n", max_packet(maxp)); |
| 812 | goto done; |
| 813 | } |
| 814 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | /* Compute interrupt scheduling parameters just once, and save. |
| 816 | * - allowing for high bandwidth, how many nsec/uframe are used? |
| 817 | * - split transactions need a second CSPLIT uframe; same question |
| 818 | * - splits also need a schedule gap (for full/low speed I/O) |
| 819 | * - qh has a polling interval |
| 820 | * |
| 821 | * For control/bulk requests, the HC or TT handles these. |
| 822 | */ |
| 823 | if (type == PIPE_INTERRUPT) { |
David Brownell | 340ba5f | 2007-12-19 11:30:39 -0800 | [diff] [blame] | 824 | qh->usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH, |
| 825 | is_input, 0, |
| 826 | hb_mult(maxp) * max_packet(maxp))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | qh->start = NO_FRAME; |
| 828 | |
| 829 | if (urb->dev->speed == USB_SPEED_HIGH) { |
| 830 | qh->c_usecs = 0; |
| 831 | qh->gap_uf = 0; |
| 832 | |
| 833 | qh->period = urb->interval >> 3; |
| 834 | if (qh->period == 0 && urb->interval != 1) { |
| 835 | /* NOTE interval 2 or 4 uframes could work. |
| 836 | * But interval 1 scheduling is simpler, and |
| 837 | * includes high bandwidth. |
| 838 | */ |
Alan Stern | 1b9a38b | 2010-01-08 11:17:55 -0500 | [diff] [blame] | 839 | urb->interval = 1; |
| 840 | } else if (qh->period > ehci->periodic_size) { |
| 841 | qh->period = ehci->periodic_size; |
| 842 | urb->interval = qh->period << 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | } |
| 844 | } else { |
david-b@pacbell.net | d038420 | 2005-08-13 18:44:58 -0700 | [diff] [blame] | 845 | int think_time; |
| 846 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | /* gap is f(FS/LS transfer times) */ |
| 848 | qh->gap_uf = 1 + usb_calc_bus_time (urb->dev->speed, |
| 849 | is_input, 0, maxp) / (125 * 1000); |
| 850 | |
| 851 | /* FIXME this just approximates SPLIT/CSPLIT times */ |
| 852 | if (is_input) { // SPLIT, gap, CSPLIT+DATA |
| 853 | qh->c_usecs = qh->usecs + HS_USECS (0); |
| 854 | qh->usecs = HS_USECS (1); |
| 855 | } else { // SPLIT+DATA, gap, CSPLIT |
| 856 | qh->usecs += HS_USECS (1); |
| 857 | qh->c_usecs = HS_USECS (0); |
| 858 | } |
| 859 | |
david-b@pacbell.net | d038420 | 2005-08-13 18:44:58 -0700 | [diff] [blame] | 860 | think_time = tt ? tt->think_time : 0; |
| 861 | qh->tt_usecs = NS_TO_US (think_time + |
| 862 | usb_calc_bus_time (urb->dev->speed, |
| 863 | is_input, 0, max_packet (maxp))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | qh->period = urb->interval; |
Alan Stern | 1b9a38b | 2010-01-08 11:17:55 -0500 | [diff] [blame] | 865 | if (qh->period > ehci->periodic_size) { |
| 866 | qh->period = ehci->periodic_size; |
| 867 | urb->interval = qh->period; |
| 868 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | } |
| 870 | } |
| 871 | |
| 872 | /* support for tt scheduling, and access to toggles */ |
Alan Stern | 6a8e87b | 2006-01-19 10:46:27 -0500 | [diff] [blame] | 873 | qh->dev = urb->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | |
| 875 | /* using TT? */ |
| 876 | switch (urb->dev->speed) { |
| 877 | case USB_SPEED_LOW: |
Alan Stern | 4c53de7 | 2012-07-11 11:21:32 -0400 | [diff] [blame] | 878 | info1 |= QH_LOW_SPEED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | /* FALL THROUGH */ |
| 880 | |
| 881 | case USB_SPEED_FULL: |
| 882 | /* EPS 0 means "full" */ |
| 883 | if (type != PIPE_INTERRUPT) |
| 884 | info1 |= (EHCI_TUNE_RL_TT << 28); |
| 885 | if (type == PIPE_CONTROL) { |
Alan Stern | 4c53de7 | 2012-07-11 11:21:32 -0400 | [diff] [blame] | 886 | info1 |= QH_CONTROL_EP; /* for TT */ |
| 887 | info1 |= QH_TOGGLE_CTL; /* toggle from qtd */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | } |
| 889 | info1 |= maxp << 16; |
| 890 | |
| 891 | info2 |= (EHCI_TUNE_MULT_TT << 30); |
Kumar Gala | 8cd42e9 | 2006-01-20 13:57:52 -0800 | [diff] [blame] | 892 | |
| 893 | /* Some Freescale processors have an erratum in which the |
| 894 | * port number in the queue head was 0..N-1 instead of 1..N. |
| 895 | */ |
| 896 | if (ehci_has_fsl_portno_bug(ehci)) |
| 897 | info2 |= (urb->dev->ttport-1) << 23; |
| 898 | else |
| 899 | info2 |= urb->dev->ttport << 23; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | |
| 901 | /* set the address of the TT; for TDI's integrated |
| 902 | * root hub tt, leave it zeroed. |
| 903 | */ |
David Brownell | 340ba5f | 2007-12-19 11:30:39 -0800 | [diff] [blame] | 904 | if (tt && tt->hub != ehci_to_hcd(ehci)->self.root_hub) |
| 905 | info2 |= tt->hub->devnum << 16; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | |
| 907 | /* NOTE: if (PIPE_INTERRUPT) { scheduler sets c-mask } */ |
| 908 | |
| 909 | break; |
| 910 | |
| 911 | case USB_SPEED_HIGH: /* no TT involved */ |
Alan Stern | 4c53de7 | 2012-07-11 11:21:32 -0400 | [diff] [blame] | 912 | info1 |= QH_HIGH_SPEED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | if (type == PIPE_CONTROL) { |
| 914 | info1 |= (EHCI_TUNE_RL_HS << 28); |
| 915 | info1 |= 64 << 16; /* usb2 fixed maxpacket */ |
Alan Stern | 4c53de7 | 2012-07-11 11:21:32 -0400 | [diff] [blame] | 916 | info1 |= QH_TOGGLE_CTL; /* toggle from qtd */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | info2 |= (EHCI_TUNE_MULT_HS << 30); |
| 918 | } else if (type == PIPE_BULK) { |
| 919 | info1 |= (EHCI_TUNE_RL_HS << 28); |
David Brownell | caa9ef6 | 2008-02-08 15:08:44 -0800 | [diff] [blame] | 920 | /* The USB spec says that high speed bulk endpoints |
| 921 | * always use 512 byte maxpacket. But some device |
| 922 | * vendors decided to ignore that, and MSFT is happy |
| 923 | * to help them do so. So now people expect to use |
| 924 | * such nonconformant devices with Linux too; sigh. |
| 925 | */ |
| 926 | info1 |= max_packet(maxp) << 16; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | info2 |= (EHCI_TUNE_MULT_HS << 30); |
| 928 | } else { /* PIPE_INTERRUPT */ |
| 929 | info1 |= max_packet (maxp) << 16; |
| 930 | info2 |= hb_mult (maxp) << 30; |
| 931 | } |
| 932 | break; |
| 933 | default: |
Greg Kroah-Hartman | 82491c2 | 2012-05-01 21:33:35 -0700 | [diff] [blame] | 934 | ehci_dbg(ehci, "bogus dev %p speed %d\n", urb->dev, |
| 935 | urb->dev->speed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | done: |
Alan Stern | c83e1a9 | 2012-07-11 11:21:25 -0400 | [diff] [blame] | 937 | qh_destroy(ehci, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | return NULL; |
| 939 | } |
| 940 | |
| 941 | /* NOTE: if (PIPE_INTERRUPT) { scheduler sets s-mask } */ |
| 942 | |
Alan Stern | c1fdb68 | 2013-03-22 13:30:43 -0400 | [diff] [blame] | 943 | /* init as live, toggle clear */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | qh->qh_state = QH_STATE_IDLE; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 945 | hw = qh->hw; |
| 946 | hw->hw_info1 = cpu_to_hc32(ehci, info1); |
| 947 | hw->hw_info2 = cpu_to_hc32(ehci, info2); |
Alan Stern | e04f5f7 | 2011-07-19 14:01:23 -0400 | [diff] [blame] | 948 | qh->is_out = !is_input; |
Alan Stern | a455212d | 2009-06-11 14:56:22 -0400 | [diff] [blame] | 949 | usb_settoggle (urb->dev, usb_pipeendpoint (urb->pipe), !is_input, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | return qh; |
| 951 | } |
| 952 | |
| 953 | /*-------------------------------------------------------------------------*/ |
| 954 | |
Alan Stern | 3144661 | 2012-07-11 11:22:21 -0400 | [diff] [blame] | 955 | static void enable_async(struct ehci_hcd *ehci) |
| 956 | { |
| 957 | if (ehci->async_count++) |
| 958 | return; |
| 959 | |
| 960 | /* Stop waiting to turn off the async schedule */ |
| 961 | ehci->enabled_hrtimer_events &= ~BIT(EHCI_HRTIMER_DISABLE_ASYNC); |
| 962 | |
| 963 | /* Don't start the schedule until ASS is 0 */ |
| 964 | ehci_poll_ASS(ehci); |
Alan Stern | 18aafe6 | 2012-07-11 11:23:04 -0400 | [diff] [blame] | 965 | turn_on_io_watchdog(ehci); |
Alan Stern | 3144661 | 2012-07-11 11:22:21 -0400 | [diff] [blame] | 966 | } |
| 967 | |
| 968 | static void disable_async(struct ehci_hcd *ehci) |
| 969 | { |
| 970 | if (--ehci->async_count) |
| 971 | return; |
| 972 | |
| 973 | /* The async schedule and async_unlink list are supposed to be empty */ |
| 974 | WARN_ON(ehci->async->qh_next.qh || ehci->async_unlink); |
| 975 | |
| 976 | /* Don't turn off the schedule until ASS is 1 */ |
| 977 | ehci_poll_ASS(ehci); |
| 978 | } |
| 979 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | /* move qh (and its qtds) onto async queue; maybe enable queue. */ |
| 981 | |
| 982 | static void qh_link_async (struct ehci_hcd *ehci, struct ehci_qh *qh) |
| 983 | { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 984 | __hc32 dma = QH_NEXT(ehci, qh->qh_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | struct ehci_qh *head; |
| 986 | |
Alan Stern | 914b701 | 2009-06-29 10:47:30 -0400 | [diff] [blame] | 987 | /* Don't link a QH if there's a Clear-TT-Buffer pending */ |
| 988 | if (unlikely(qh->clearing_tt)) |
| 989 | return; |
| 990 | |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 991 | WARN_ON(qh->qh_state != QH_STATE_IDLE); |
| 992 | |
Alan Stern | a455212d | 2009-06-11 14:56:22 -0400 | [diff] [blame] | 993 | /* clear halt and/or toggle; and maybe recover from silicon quirk */ |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 994 | qh_refresh(ehci, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | |
| 996 | /* splice right after start */ |
Alan Stern | 3144661 | 2012-07-11 11:22:21 -0400 | [diff] [blame] | 997 | head = ehci->async; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | qh->qh_next = head->qh_next; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 999 | qh->hw->hw_next = head->hw->hw_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | wmb (); |
| 1001 | |
| 1002 | head->qh_next.qh = qh; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 1003 | head->hw->hw_next = dma; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | |
Alan Stern | ef4638f | 2009-07-31 10:41:40 -0400 | [diff] [blame] | 1005 | qh->xacterrs = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | qh->qh_state = QH_STATE_LINKED; |
| 1007 | /* qtd completions reported later by interrupt */ |
Alan Stern | 3144661 | 2012-07-11 11:22:21 -0400 | [diff] [blame] | 1008 | |
| 1009 | enable_async(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | } |
| 1011 | |
| 1012 | /*-------------------------------------------------------------------------*/ |
| 1013 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | /* |
| 1015 | * For control/bulk/interrupt, return QH with these TDs appended. |
| 1016 | * Allocates and initializes the QH if necessary. |
| 1017 | * Returns null if it can't allocate a QH it needs to. |
| 1018 | * If the QH has TDs (urbs) already, that's great. |
| 1019 | */ |
| 1020 | static struct ehci_qh *qh_append_tds ( |
| 1021 | struct ehci_hcd *ehci, |
| 1022 | struct urb *urb, |
| 1023 | struct list_head *qtd_list, |
| 1024 | int epnum, |
| 1025 | void **ptr |
| 1026 | ) |
| 1027 | { |
| 1028 | struct ehci_qh *qh = NULL; |
Al Viro | fd05e72 | 2008-04-28 07:00:16 +0100 | [diff] [blame] | 1029 | __hc32 qh_addr_mask = cpu_to_hc32(ehci, 0x7f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | |
| 1031 | qh = (struct ehci_qh *) *ptr; |
| 1032 | if (unlikely (qh == NULL)) { |
| 1033 | /* can't sleep here, we have ehci->lock... */ |
| 1034 | qh = qh_make (ehci, urb, GFP_ATOMIC); |
| 1035 | *ptr = qh; |
| 1036 | } |
| 1037 | if (likely (qh != NULL)) { |
| 1038 | struct ehci_qtd *qtd; |
| 1039 | |
| 1040 | if (unlikely (list_empty (qtd_list))) |
| 1041 | qtd = NULL; |
| 1042 | else |
| 1043 | qtd = list_entry (qtd_list->next, struct ehci_qtd, |
| 1044 | qtd_list); |
| 1045 | |
| 1046 | /* control qh may need patching ... */ |
| 1047 | if (unlikely (epnum == 0)) { |
| 1048 | |
| 1049 | /* usb_reset_device() briefly reverts to address 0 */ |
| 1050 | if (usb_pipedevice (urb->pipe) == 0) |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 1051 | qh->hw->hw_info1 &= ~qh_addr_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | } |
| 1053 | |
| 1054 | /* just one way to queue requests: swap with the dummy qtd. |
| 1055 | * only hc or qh_refresh() ever modify the overlay. |
| 1056 | */ |
| 1057 | if (likely (qtd != NULL)) { |
| 1058 | struct ehci_qtd *dummy; |
| 1059 | dma_addr_t dma; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1060 | __hc32 token; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | |
| 1062 | /* to avoid racing the HC, use the dummy td instead of |
| 1063 | * the first td of our list (becomes new dummy). both |
| 1064 | * tds stay deactivated until we're done, when the |
| 1065 | * HC is allowed to fetch the old dummy (4.10.2). |
| 1066 | */ |
| 1067 | token = qtd->hw_token; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1068 | qtd->hw_token = HALT_BIT(ehci); |
Ming Lei | 41f05de | 2011-09-05 21:05:58 +0800 | [diff] [blame] | 1069 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | dummy = qh->dummy; |
| 1071 | |
| 1072 | dma = dummy->qtd_dma; |
| 1073 | *dummy = *qtd; |
| 1074 | dummy->qtd_dma = dma; |
| 1075 | |
| 1076 | list_del (&qtd->qtd_list); |
| 1077 | list_add (&dummy->qtd_list, qtd_list); |
Luis R. Rodriguez | 7d283ae | 2008-08-06 15:21:26 -0700 | [diff] [blame] | 1078 | list_splice_tail(qtd_list, &qh->qtd_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1080 | ehci_qtd_init(ehci, qtd, qtd->qtd_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | qh->dummy = qtd; |
| 1082 | |
| 1083 | /* hc must see the new dummy at list end */ |
| 1084 | dma = qtd->qtd_dma; |
| 1085 | qtd = list_entry (qh->qtd_list.prev, |
| 1086 | struct ehci_qtd, qtd_list); |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1087 | qtd->hw_next = QTD_NEXT(ehci, dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | |
| 1089 | /* let the hc process these next qtds */ |
| 1090 | wmb (); |
| 1091 | dummy->hw_token = token; |
| 1092 | |
Alan Stern | c83e1a9 | 2012-07-11 11:21:25 -0400 | [diff] [blame] | 1093 | urb->hcpriv = qh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | } |
| 1095 | } |
| 1096 | return qh; |
| 1097 | } |
| 1098 | |
| 1099 | /*-------------------------------------------------------------------------*/ |
| 1100 | |
| 1101 | static int |
| 1102 | submit_async ( |
| 1103 | struct ehci_hcd *ehci, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | struct urb *urb, |
| 1105 | struct list_head *qtd_list, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 1106 | gfp_t mem_flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1107 | ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | int epnum; |
| 1109 | unsigned long flags; |
| 1110 | struct ehci_qh *qh = NULL; |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1111 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1113 | epnum = urb->ep->desc.bEndpointAddress; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | |
| 1115 | #ifdef EHCI_URB_TRACE |
David Daney | eb34a90 | 2011-01-25 09:59:36 -0800 | [diff] [blame] | 1116 | { |
| 1117 | struct ehci_qtd *qtd; |
| 1118 | qtd = list_entry(qtd_list->next, struct ehci_qtd, qtd_list); |
| 1119 | ehci_dbg(ehci, |
| 1120 | "%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n", |
| 1121 | __func__, urb->dev->devpath, urb, |
| 1122 | epnum & 0x0f, (epnum & USB_DIR_IN) ? "in" : "out", |
| 1123 | urb->transfer_buffer_length, |
| 1124 | qtd, urb->ep->hcpriv); |
| 1125 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | #endif |
| 1127 | |
| 1128 | spin_lock_irqsave (&ehci->lock, flags); |
Alan Stern | 541c7d4 | 2010-06-22 16:39:10 -0400 | [diff] [blame] | 1129 | if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) { |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1130 | rc = -ESHUTDOWN; |
| 1131 | goto done; |
| 1132 | } |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1133 | rc = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb); |
| 1134 | if (unlikely(rc)) |
| 1135 | goto done; |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1136 | |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1137 | qh = qh_append_tds(ehci, urb, qtd_list, epnum, &urb->ep->hcpriv); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1138 | if (unlikely(qh == NULL)) { |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1139 | usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1140 | rc = -ENOMEM; |
| 1141 | goto done; |
| 1142 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | |
| 1144 | /* Control/bulk operations through TTs don't need scheduling, |
| 1145 | * the HC and TT handle it when the TT has a buffer ready. |
| 1146 | */ |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1147 | if (likely (qh->qh_state == QH_STATE_IDLE)) |
Alan Stern | 7a0f0d9 | 2009-07-31 10:40:22 -0400 | [diff] [blame] | 1148 | qh_link_async(ehci, qh); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1149 | done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | spin_unlock_irqrestore (&ehci->lock, flags); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1151 | if (unlikely (qh == NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | qtd_list_free (ehci, urb, qtd_list); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1153 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | } |
| 1155 | |
| 1156 | /*-------------------------------------------------------------------------*/ |
| 1157 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1158 | static void single_unlink_async(struct ehci_hcd *ehci, struct ehci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | { |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1160 | struct ehci_qh *prev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1162 | /* Add to the end of the list of QHs waiting for the next IAAD */ |
Alan Stern | 6402c79 | 2013-03-01 10:50:08 -0500 | [diff] [blame] | 1163 | qh->qh_state = QH_STATE_UNLINK_WAIT; |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1164 | if (ehci->async_unlink) |
| 1165 | ehci->async_unlink_last->unlink_next = qh; |
| 1166 | else |
| 1167 | ehci->async_unlink = qh; |
| 1168 | ehci->async_unlink_last = qh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1170 | /* Unlink it from the schedule */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | prev = ehci->async; |
| 1172 | while (prev->qh_next.qh != qh) |
| 1173 | prev = prev->qh_next.qh; |
| 1174 | |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 1175 | prev->hw->hw_next = qh->hw->hw_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | prev->qh_next = qh->qh_next; |
Alan Stern | 004c196 | 2011-07-05 12:34:05 -0400 | [diff] [blame] | 1177 | if (ehci->qh_scan_next == qh) |
| 1178 | ehci->qh_scan_next = qh->qh_next.qh; |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1179 | } |
| 1180 | |
| 1181 | static void start_iaa_cycle(struct ehci_hcd *ehci, bool nested) |
| 1182 | { |
| 1183 | /* |
| 1184 | * Do nothing if an IAA cycle is already running or |
| 1185 | * if one will be started shortly. |
| 1186 | */ |
| 1187 | if (ehci->async_iaa || ehci->async_unlinking) |
| 1188 | return; |
| 1189 | |
Alan Stern | 391016f | 2009-03-16 14:21:56 -0400 | [diff] [blame] | 1190 | /* If the controller isn't running, we don't have to wait for it */ |
Alan Stern | c0c53db | 2012-07-11 11:21:48 -0400 | [diff] [blame] | 1191 | if (unlikely(ehci->rh_state < EHCI_RH_RUNNING)) { |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1192 | |
| 1193 | /* Do all the waiting QHs */ |
| 1194 | ehci->async_iaa = ehci->async_unlink; |
| 1195 | ehci->async_unlink = NULL; |
| 1196 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1197 | if (!nested) /* Avoid recursion */ |
| 1198 | end_unlink_async(ehci); |
| 1199 | |
| 1200 | /* Otherwise start a new IAA cycle */ |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1201 | } else if (likely(ehci->rh_state == EHCI_RH_RUNNING)) { |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1202 | struct ehci_qh *qh; |
| 1203 | |
| 1204 | /* Do only the first waiting QH (nVidia bug?) */ |
| 1205 | qh = ehci->async_unlink; |
Alan Stern | 6402c79 | 2013-03-01 10:50:08 -0500 | [diff] [blame] | 1206 | |
| 1207 | /* |
| 1208 | * Intel (?) bug: The HC can write back the overlay region |
| 1209 | * even after the IAA interrupt occurs. In self-defense, |
| 1210 | * always go through two IAA cycles for each QH. |
| 1211 | */ |
| 1212 | if (qh->qh_state == QH_STATE_UNLINK_WAIT) { |
| 1213 | qh->qh_state = QH_STATE_UNLINK; |
| 1214 | } else { |
| 1215 | ehci->async_iaa = qh; |
| 1216 | ehci->async_unlink = qh->unlink_next; |
| 1217 | qh->unlink_next = NULL; |
| 1218 | } |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1219 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1220 | /* Make sure the unlinks are all visible to the hardware */ |
| 1221 | wmb(); |
| 1222 | |
| 1223 | ehci_writel(ehci, ehci->command | CMD_IAAD, |
| 1224 | &ehci->regs->command); |
| 1225 | ehci_readl(ehci, &ehci->regs->command); |
| 1226 | ehci_enable_event(ehci, EHCI_HRTIMER_IAA_WATCHDOG, true); |
| 1227 | } |
| 1228 | } |
| 1229 | |
| 1230 | /* the async qh for the qtds being unlinked are now gone from the HC */ |
| 1231 | |
| 1232 | static void end_unlink_async(struct ehci_hcd *ehci) |
| 1233 | { |
| 1234 | struct ehci_qh *qh; |
| 1235 | |
| 1236 | if (ehci->has_synopsys_hc_bug) |
| 1237 | ehci_writel(ehci, (u32) ehci->async->qh_dma, |
| 1238 | &ehci->regs->async_next); |
| 1239 | |
| 1240 | /* Process the idle QHs */ |
| 1241 | restart: |
| 1242 | ehci->async_unlinking = true; |
| 1243 | while (ehci->async_iaa) { |
| 1244 | qh = ehci->async_iaa; |
| 1245 | ehci->async_iaa = qh->unlink_next; |
| 1246 | qh->unlink_next = NULL; |
| 1247 | |
| 1248 | qh->qh_state = QH_STATE_IDLE; |
| 1249 | qh->qh_next.qh = NULL; |
| 1250 | |
Alan Stern | 79bcf7b | 2013-03-22 13:30:56 -0400 | [diff] [blame^] | 1251 | if (!list_empty(&qh->qtd_list)) |
| 1252 | qh_completions(ehci, qh); |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1253 | if (!list_empty(&qh->qtd_list) && |
| 1254 | ehci->rh_state == EHCI_RH_RUNNING) |
| 1255 | qh_link_async(ehci, qh); |
| 1256 | disable_async(ehci); |
| 1257 | } |
| 1258 | ehci->async_unlinking = false; |
| 1259 | |
| 1260 | /* Start a new IAA cycle if any QHs are waiting for it */ |
| 1261 | if (ehci->async_unlink) { |
| 1262 | start_iaa_cycle(ehci, true); |
| 1263 | if (unlikely(ehci->rh_state < EHCI_RH_RUNNING)) |
| 1264 | goto restart; |
| 1265 | } |
| 1266 | } |
| 1267 | |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1268 | static void start_unlink_async(struct ehci_hcd *ehci, struct ehci_qh *qh); |
| 1269 | |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1270 | static void unlink_empty_async(struct ehci_hcd *ehci) |
| 1271 | { |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1272 | struct ehci_qh *qh; |
| 1273 | struct ehci_qh *qh_to_unlink = NULL; |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1274 | bool check_unlinks_later = false; |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1275 | int count = 0; |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1276 | |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1277 | /* Find the last async QH which has been empty for a timer cycle */ |
| 1278 | for (qh = ehci->async->qh_next.qh; qh; qh = qh->qh_next.qh) { |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1279 | if (list_empty(&qh->qtd_list) && |
| 1280 | qh->qh_state == QH_STATE_LINKED) { |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1281 | ++count; |
| 1282 | if (qh->unlink_cycle == ehci->async_unlink_cycle) |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1283 | check_unlinks_later = true; |
| 1284 | else |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1285 | qh_to_unlink = qh; |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1286 | } |
| 1287 | } |
| 1288 | |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1289 | /* If nothing else is being unlinked, unlink the last empty QH */ |
| 1290 | if (!ehci->async_iaa && !ehci->async_unlink && qh_to_unlink) { |
| 1291 | start_unlink_async(ehci, qh_to_unlink); |
| 1292 | --count; |
| 1293 | } |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1294 | |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1295 | /* Other QHs will be handled later */ |
| 1296 | if (count > 0) { |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1297 | ehci_enable_event(ehci, EHCI_HRTIMER_ASYNC_UNLINKS, true); |
| 1298 | ++ehci->async_unlink_cycle; |
| 1299 | } |
| 1300 | } |
| 1301 | |
Alan Stern | 2a40f32 | 2013-03-15 14:40:26 -0400 | [diff] [blame] | 1302 | /* The root hub is suspended; unlink all the async QHs */ |
| 1303 | static void unlink_empty_async_suspended(struct ehci_hcd *ehci) |
| 1304 | { |
| 1305 | struct ehci_qh *qh; |
| 1306 | |
| 1307 | while (ehci->async->qh_next.qh) { |
| 1308 | qh = ehci->async->qh_next.qh; |
| 1309 | WARN_ON(!list_empty(&qh->qtd_list)); |
| 1310 | single_unlink_async(ehci, qh); |
| 1311 | } |
| 1312 | start_iaa_cycle(ehci, false); |
| 1313 | } |
| 1314 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1315 | /* makes sure the async qh will become idle */ |
| 1316 | /* caller must own ehci->lock */ |
| 1317 | |
| 1318 | static void start_unlink_async(struct ehci_hcd *ehci, struct ehci_qh *qh) |
| 1319 | { |
| 1320 | /* |
| 1321 | * If the QH isn't linked then there's nothing we can do |
| 1322 | * unless we were called during a giveback, in which case |
| 1323 | * qh_completions() has to deal with it. |
| 1324 | */ |
| 1325 | if (qh->qh_state != QH_STATE_LINKED) { |
| 1326 | if (qh->qh_state == QH_STATE_COMPLETING) |
| 1327 | qh->needs_rescan = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1328 | return; |
| 1329 | } |
| 1330 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1331 | single_unlink_async(ehci, qh); |
| 1332 | start_iaa_cycle(ehci, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | } |
| 1334 | |
| 1335 | /*-------------------------------------------------------------------------*/ |
| 1336 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1337 | static void scan_async (struct ehci_hcd *ehci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | { |
| 1339 | struct ehci_qh *qh; |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1340 | bool check_unlinks_later = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1341 | |
Alan Stern | 004c196 | 2011-07-05 12:34:05 -0400 | [diff] [blame] | 1342 | ehci->qh_scan_next = ehci->async->qh_next.qh; |
| 1343 | while (ehci->qh_scan_next) { |
| 1344 | qh = ehci->qh_scan_next; |
| 1345 | ehci->qh_scan_next = qh->qh_next.qh; |
Alan Stern | 79bcf7b | 2013-03-22 13:30:56 -0400 | [diff] [blame^] | 1346 | |
Alan Stern | 004c196 | 2011-07-05 12:34:05 -0400 | [diff] [blame] | 1347 | /* clean any finished work for this qh */ |
| 1348 | if (!list_empty(&qh->qtd_list)) { |
| 1349 | int temp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | |
Alan Stern | 004c196 | 2011-07-05 12:34:05 -0400 | [diff] [blame] | 1351 | /* |
| 1352 | * Unlinks could happen here; completion reporting |
| 1353 | * drops the lock. That's why ehci->qh_scan_next |
| 1354 | * always holds the next qh to scan; if the next qh |
| 1355 | * gets unlinked then ehci->qh_scan_next is adjusted |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1356 | * in single_unlink_async(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | */ |
Alan Stern | 004c196 | 2011-07-05 12:34:05 -0400 | [diff] [blame] | 1358 | temp = qh_completions(ehci, qh); |
Alan Stern | 79bcf7b | 2013-03-22 13:30:56 -0400 | [diff] [blame^] | 1359 | if (unlikely(temp)) { |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1360 | start_unlink_async(ehci, qh); |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1361 | } else if (list_empty(&qh->qtd_list) |
| 1362 | && qh->qh_state == QH_STATE_LINKED) { |
| 1363 | qh->unlink_cycle = ehci->async_unlink_cycle; |
| 1364 | check_unlinks_later = true; |
Alan Stern | 79bcf7b | 2013-03-22 13:30:56 -0400 | [diff] [blame^] | 1365 | } |
Alan Stern | 004c196 | 2011-07-05 12:34:05 -0400 | [diff] [blame] | 1366 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | } |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1368 | |
| 1369 | /* |
| 1370 | * Unlink empty entries, reducing DMA usage as well |
| 1371 | * as HCD schedule-scanning costs. Delay for any qh |
| 1372 | * we just scanned, there's a not-unusual case that it |
| 1373 | * doesn't stay idle for long. |
| 1374 | */ |
| 1375 | if (check_unlinks_later && ehci->rh_state == EHCI_RH_RUNNING && |
| 1376 | !(ehci->enabled_hrtimer_events & |
| 1377 | BIT(EHCI_HRTIMER_ASYNC_UNLINKS))) { |
| 1378 | ehci_enable_event(ehci, EHCI_HRTIMER_ASYNC_UNLINKS, true); |
| 1379 | ++ehci->async_unlink_cycle; |
| 1380 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1381 | } |