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 | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame] | 108 | if (unlikely(!usb_gettoggle(qh->ps.udev, 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 | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame] | 110 | usb_settoggle(qh->ps.udev, epnum, is_out, 1); |
Alan Stern | a455212d | 2009-06-11 14:56:22 -0400 | [diff] [blame] | 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 | */ |
Alan Stern | fc0855f | 2015-11-20 13:53:58 -0500 | [diff] [blame] | 135 | if (qh->hw->hw_token & ACTIVE_BIT(ehci)) { |
Alan Stern | c1fdb68 | 2013-03-22 13:30:43 -0400 | [diff] [blame] | 136 | qh->hw->hw_qtd_next = qtd->hw_next; |
Alan Stern | fc0855f | 2015-11-20 13:53:58 -0500 | [diff] [blame] | 137 | if (qh->should_be_inactive) |
| 138 | ehci_warn(ehci, "qh %p should be inactive!\n", qh); |
| 139 | } else { |
Alan Stern | c1fdb68 | 2013-03-22 13:30:43 -0400 | [diff] [blame] | 140 | qh_update(ehci, qh, qtd); |
Alan Stern | fc0855f | 2015-11-20 13:53:58 -0500 | [diff] [blame] | 141 | } |
| 142 | qh->should_be_inactive = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | } |
| 144 | |
| 145 | /*-------------------------------------------------------------------------*/ |
| 146 | |
Alan Stern | 914b701 | 2009-06-29 10:47:30 -0400 | [diff] [blame] | 147 | static void qh_link_async(struct ehci_hcd *ehci, struct ehci_qh *qh); |
| 148 | |
| 149 | static void ehci_clear_tt_buffer_complete(struct usb_hcd *hcd, |
| 150 | struct usb_host_endpoint *ep) |
| 151 | { |
| 152 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); |
| 153 | struct ehci_qh *qh = ep->hcpriv; |
| 154 | unsigned long flags; |
| 155 | |
| 156 | spin_lock_irqsave(&ehci->lock, flags); |
| 157 | qh->clearing_tt = 0; |
| 158 | if (qh->qh_state == QH_STATE_IDLE && !list_empty(&qh->qtd_list) |
Alan Stern | e879990 | 2011-08-18 16:31:30 -0400 | [diff] [blame] | 159 | && ehci->rh_state == EHCI_RH_RUNNING) |
Alan Stern | 914b701 | 2009-06-29 10:47:30 -0400 | [diff] [blame] | 160 | qh_link_async(ehci, qh); |
| 161 | spin_unlock_irqrestore(&ehci->lock, flags); |
| 162 | } |
| 163 | |
| 164 | static void ehci_clear_tt_buffer(struct ehci_hcd *ehci, struct ehci_qh *qh, |
| 165 | struct urb *urb, u32 token) |
| 166 | { |
| 167 | |
| 168 | /* If an async split transaction gets an error or is unlinked, |
| 169 | * the TT buffer may be left in an indeterminate state. We |
| 170 | * have to clear the TT buffer. |
| 171 | * |
| 172 | * Note: this routine is never called for Isochronous transfers. |
| 173 | */ |
| 174 | if (urb->dev->tt && !usb_pipeint(urb->pipe) && !qh->clearing_tt) { |
Oliver Neukum | 1c20163 | 2013-11-18 13:23:16 +0100 | [diff] [blame] | 175 | #ifdef CONFIG_DYNAMIC_DEBUG |
Alan Stern | 914b701 | 2009-06-29 10:47:30 -0400 | [diff] [blame] | 176 | struct usb_device *tt = urb->dev->tt->hub; |
| 177 | dev_dbg(&tt->dev, |
| 178 | "clear tt buffer port %d, a%d ep%d t%08x\n", |
| 179 | urb->dev->ttport, urb->dev->devnum, |
| 180 | usb_pipeendpoint(urb->pipe), token); |
Oliver Neukum | 1c20163 | 2013-11-18 13:23:16 +0100 | [diff] [blame] | 181 | #endif /* CONFIG_DYNAMIC_DEBUG */ |
Alan Stern | 914b701 | 2009-06-29 10:47:30 -0400 | [diff] [blame] | 182 | if (!ehci_is_TDI(ehci) |
| 183 | || urb->dev->tt->hub != |
| 184 | ehci_to_hcd(ehci)->self.root_hub) { |
| 185 | if (usb_hub_clear_tt_buffer(urb) == 0) |
| 186 | qh->clearing_tt = 1; |
| 187 | } else { |
| 188 | |
| 189 | /* REVISIT ARC-derived cores don't clear the root |
| 190 | * hub TT buffer in this way... |
| 191 | */ |
| 192 | } |
| 193 | } |
| 194 | } |
| 195 | |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 196 | static int qtd_copy_status ( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | struct ehci_hcd *ehci, |
| 198 | struct urb *urb, |
| 199 | size_t length, |
| 200 | u32 token |
| 201 | ) |
| 202 | { |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 203 | int status = -EINPROGRESS; |
| 204 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | /* count IN/OUT bytes, not SETUP (even short packets) */ |
| 206 | if (likely (QTD_PID (token) != 2)) |
| 207 | urb->actual_length += length - QTD_LENGTH (token); |
| 208 | |
| 209 | /* don't modify error codes */ |
Alan Stern | eb23105 | 2007-08-21 15:40:36 -0400 | [diff] [blame] | 210 | if (unlikely(urb->unlinked)) |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 211 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
| 213 | /* force cleanup after short read; not always an error */ |
| 214 | if (unlikely (IS_SHORT_READ (token))) |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 215 | status = -EREMOTEIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | |
| 217 | /* serious "can't proceed" faults reported by the hardware */ |
| 218 | if (token & QTD_STS_HALT) { |
| 219 | if (token & QTD_STS_BABBLE) { |
| 220 | /* FIXME "must" disable babbling device's port too */ |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 221 | status = -EOVERFLOW; |
Alan Stern | ba516de | 2009-06-29 17:36:14 -0400 | [diff] [blame] | 222 | /* CERR nonzero + halt --> stall */ |
| 223 | } else if (QTD_CERR(token)) { |
| 224 | status = -EPIPE; |
| 225 | |
| 226 | /* In theory, more than one of the following bits can be set |
| 227 | * since they are sticky and the transaction is retried. |
| 228 | * Which to test first is rather arbitrary. |
| 229 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | } else if (token & QTD_STS_MMF) { |
| 231 | /* fs/ls interrupt xfer missed the complete-split */ |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 232 | status = -EPROTO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | } else if (token & QTD_STS_DBE) { |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 234 | status = (QTD_PID (token) == 1) /* IN ? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | ? -ENOSR /* hc couldn't read data */ |
| 236 | : -ECOMM; /* hc couldn't write data */ |
| 237 | } else if (token & QTD_STS_XACT) { |
Alan Stern | ba516de | 2009-06-29 17:36:14 -0400 | [diff] [blame] | 238 | /* timeout, bad CRC, wrong PID, etc */ |
| 239 | ehci_dbg(ehci, "devpath %s ep%d%s 3strikes\n", |
| 240 | urb->dev->devpath, |
| 241 | usb_pipeendpoint(urb->pipe), |
| 242 | usb_pipein(urb->pipe) ? "in" : "out"); |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 243 | status = -EPROTO; |
Alan Stern | ba516de | 2009-06-29 17:36:14 -0400 | [diff] [blame] | 244 | } else { /* unknown */ |
| 245 | status = -EPROTO; |
| 246 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | } |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 248 | |
| 249 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | } |
| 251 | |
| 252 | static void |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 253 | ehci_urb_done(struct ehci_hcd *ehci, struct urb *urb, int status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | { |
Alan Stern | 2656a9a | 2012-11-08 10:17:01 -0500 | [diff] [blame] | 255 | if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT) { |
| 256 | /* ... update hc-wide periodic stats */ |
| 257 | ehci_to_hcd(ehci)->self.bandwidth_int_reqs--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | } |
| 259 | |
Alan Stern | eb23105 | 2007-08-21 15:40:36 -0400 | [diff] [blame] | 260 | if (unlikely(urb->unlinked)) { |
| 261 | COUNT(ehci->stats.unlink); |
| 262 | } else { |
David Brownell | 4f66762 | 2008-04-12 08:32:05 -0700 | [diff] [blame] | 263 | /* report non-error and short read status as zero */ |
| 264 | if (status == -EINPROGRESS || status == -EREMOTEIO) |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 265 | status = 0; |
Alan Stern | eb23105 | 2007-08-21 15:40:36 -0400 | [diff] [blame] | 266 | COUNT(ehci->stats.complete); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | |
| 269 | #ifdef EHCI_URB_TRACE |
| 270 | ehci_dbg (ehci, |
Vamsi Krishna Samavedam | f826f83 | 2016-11-03 17:06:34 -0700 | [diff] [blame] | 271 | "%s %s urb %pK ep%d%s status %d len %d/%d\n", |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 272 | __func__, urb->dev->devpath, urb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | usb_pipeendpoint (urb->pipe), |
| 274 | usb_pipein (urb->pipe) ? "in" : "out", |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 275 | status, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | urb->actual_length, urb->transfer_buffer_length); |
| 277 | #endif |
| 278 | |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 279 | usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb); |
Alan Stern | 4a00027 | 2007-08-24 15:42:24 -0400 | [diff] [blame] | 280 | usb_hcd_giveback_urb(ehci_to_hcd(ehci), urb, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | } |
| 282 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | static int qh_schedule (struct ehci_hcd *ehci, struct ehci_qh *qh); |
| 284 | |
| 285 | /* |
| 286 | * Process and free completed qtds for a qh, returning URBs to drivers. |
Alan Stern | 79bcf7b | 2013-03-22 13:30:56 -0400 | [diff] [blame] | 287 | * Chases up to qh->hw_current. Returns nonzero if the caller should |
| 288 | * unlink qh. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | static unsigned |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 291 | qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | { |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 293 | struct ehci_qtd *last, *end = qh->dummy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | struct list_head *entry, *tmp; |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 295 | int last_status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | int stopped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | u8 state; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 298 | struct ehci_qh_hw *hw = qh->hw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | /* completions (or tasks on other cpus) must never clobber HALT |
| 301 | * till we've gone through and cleaned everything up, even when |
| 302 | * they add urbs to this qh's queue or mark them for unlinking. |
| 303 | * |
| 304 | * NOTE: unlinking expects to be done in queue order. |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 305 | * |
| 306 | * It's a bug for qh->qh_state to be anything other than |
| 307 | * QH_STATE_IDLE, unless our caller is scan_async() or |
Alan Stern | 569b394 | 2012-07-11 11:23:00 -0400 | [diff] [blame] | 308 | * scan_intr(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | */ |
| 310 | state = qh->qh_state; |
| 311 | qh->qh_state = QH_STATE_COMPLETING; |
| 312 | stopped = (state == QH_STATE_IDLE); |
| 313 | |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 314 | rescan: |
| 315 | last = NULL; |
| 316 | last_status = -EINPROGRESS; |
Alan Stern | 7bc782d | 2013-03-22 13:31:11 -0400 | [diff] [blame] | 317 | qh->dequeue_during_giveback = 0; |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 318 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | /* remove de-activated QTDs from front of queue. |
| 320 | * after faults (including short reads), cleanup this urb |
| 321 | * then let the queue advance. |
| 322 | * if queue is stopped, handles unlinks. |
| 323 | */ |
| 324 | list_for_each_safe (entry, tmp, &qh->qtd_list) { |
| 325 | struct ehci_qtd *qtd; |
| 326 | struct urb *urb; |
| 327 | u32 token = 0; |
| 328 | |
| 329 | qtd = list_entry (entry, struct ehci_qtd, qtd_list); |
| 330 | urb = qtd->urb; |
| 331 | |
| 332 | /* clean up any state from previous QTD ...*/ |
| 333 | if (last) { |
| 334 | if (likely (last->urb != urb)) { |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 335 | ehci_urb_done(ehci, last->urb, last_status); |
Misha Zhilin | b5f7a0e | 2008-02-27 18:05:24 -0800 | [diff] [blame] | 336 | last_status = -EINPROGRESS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | } |
| 338 | ehci_qtd_free (ehci, last); |
| 339 | last = NULL; |
| 340 | } |
| 341 | |
| 342 | /* ignore urbs submitted during completions we reported */ |
| 343 | if (qtd == end) |
| 344 | break; |
| 345 | |
| 346 | /* hardware copies qtd out of qh overlay */ |
| 347 | rmb (); |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 348 | token = hc32_to_cpu(ehci, qtd->hw_token); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | |
| 350 | /* always clean up qtds the hc de-activated */ |
Alan Stern | a2c2706 | 2009-02-10 10:16:58 -0500 | [diff] [blame] | 351 | retry_xacterr: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | if ((token & QTD_STS_ACTIVE) == 0) { |
| 353 | |
Vikram Pandita | 332960b | 2011-10-30 12:55:09 -0700 | [diff] [blame] | 354 | /* Report Data Buffer Error: non-fatal but useful */ |
| 355 | if (token & QTD_STS_DBE) |
| 356 | ehci_dbg(ehci, |
Vamsi Krishna Samavedam | f826f83 | 2016-11-03 17:06:34 -0700 | [diff] [blame] | 357 | "detected DataBufferErr for urb %pK ep%d%s len %d, qtd %pK [qh %pK]\n", |
Vikram Pandita | 332960b | 2011-10-30 12:55:09 -0700 | [diff] [blame] | 358 | urb, |
| 359 | usb_endpoint_num(&urb->ep->desc), |
| 360 | usb_endpoint_dir_in(&urb->ep->desc) ? "in" : "out", |
| 361 | urb->transfer_buffer_length, |
| 362 | qtd, |
| 363 | qh); |
| 364 | |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 365 | /* on STALL, error, and short reads this urb must |
| 366 | * complete and all its qtds must be recycled. |
| 367 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | if ((token & QTD_STS_HALT) != 0) { |
Alan Stern | a2c2706 | 2009-02-10 10:16:58 -0500 | [diff] [blame] | 369 | |
| 370 | /* retry transaction errors until we |
| 371 | * reach the software xacterr limit |
| 372 | */ |
| 373 | if ((token & QTD_STS_XACT) && |
| 374 | QTD_CERR(token) == 0 && |
Alan Stern | ef4638f | 2009-07-31 10:41:40 -0400 | [diff] [blame] | 375 | ++qh->xacterrs < QH_XACTERR_MAX && |
Alan Stern | a2c2706 | 2009-02-10 10:16:58 -0500 | [diff] [blame] | 376 | !urb->unlinked) { |
| 377 | ehci_dbg(ehci, |
Randy Dunlap | d062680 | 2009-02-13 11:22:06 -0800 | [diff] [blame] | 378 | "detected XactErr len %zu/%zu retry %d\n", |
Alan Stern | ef4638f | 2009-07-31 10:41:40 -0400 | [diff] [blame] | 379 | qtd->length - QTD_LENGTH(token), qtd->length, qh->xacterrs); |
Alan Stern | a2c2706 | 2009-02-10 10:16:58 -0500 | [diff] [blame] | 380 | |
| 381 | /* reset the token in the qtd and the |
| 382 | * qh overlay (which still contains |
| 383 | * the qtd) so that we pick up from |
| 384 | * where we left off |
| 385 | */ |
| 386 | token &= ~QTD_STS_HALT; |
| 387 | token |= QTD_STS_ACTIVE | |
| 388 | (EHCI_TUNE_CERR << 10); |
| 389 | qtd->hw_token = cpu_to_hc32(ehci, |
| 390 | token); |
| 391 | wmb(); |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 392 | hw->hw_token = cpu_to_hc32(ehci, |
| 393 | token); |
Alan Stern | a2c2706 | 2009-02-10 10:16:58 -0500 | [diff] [blame] | 394 | goto retry_xacterr; |
| 395 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | stopped = 1; |
Alan Stern | fcc5184 | 2016-01-25 15:42:04 -0500 | [diff] [blame] | 397 | qh->unlink_reason |= QH_UNLINK_HALTED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | |
| 399 | /* magic dummy for some short reads; qh won't advance. |
| 400 | * that silicon quirk can kick in with this dummy too. |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 401 | * |
| 402 | * other short reads won't stop the queue, including |
| 403 | * control transfers (status stage handles that) or |
| 404 | * most other single-qtd reads ... the queue stops if |
| 405 | * URB_SHORT_NOT_OK was set so the driver submitting |
| 406 | * the urbs could clean it up. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | */ |
| 408 | } else if (IS_SHORT_READ (token) |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 409 | && !(qtd->hw_alt_next |
| 410 | & EHCI_LIST_END(ehci))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | stopped = 1; |
Alan Stern | fcc5184 | 2016-01-25 15:42:04 -0500 | [diff] [blame] | 412 | qh->unlink_reason |= QH_UNLINK_SHORT_READ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | } |
| 414 | |
| 415 | /* stop scanning when we reach qtds the hc is using */ |
| 416 | } else if (likely (!stopped |
Alan Stern | c0c53db | 2012-07-11 11:21:48 -0400 | [diff] [blame] | 417 | && ehci->rh_state >= EHCI_RH_RUNNING)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | break; |
| 419 | |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 420 | /* scan the whole queue for unlinks whenever it stops */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | } else { |
| 422 | stopped = 1; |
| 423 | |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 424 | /* cancel everything if we halt, suspend, etc */ |
Alan Stern | fcc5184 | 2016-01-25 15:42:04 -0500 | [diff] [blame] | 425 | if (ehci->rh_state < EHCI_RH_RUNNING) { |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 426 | last_status = -ESHUTDOWN; |
Alan Stern | fcc5184 | 2016-01-25 15:42:04 -0500 | [diff] [blame] | 427 | qh->unlink_reason |= QH_UNLINK_SHUTDOWN; |
| 428 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 430 | /* this qtd is active; skip it unless a previous qtd |
| 431 | * for its urb faulted, or its urb was canceled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | */ |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 433 | else if (last_status == -EINPROGRESS && !urb->unlinked) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | continue; |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 435 | |
Alan Stern | feca774 | 2013-03-01 10:51:15 -0500 | [diff] [blame] | 436 | /* |
| 437 | * If this was the active qtd when the qh was unlinked |
| 438 | * and the overlay's token is active, then the overlay |
| 439 | * hasn't been written back to the qtd yet so use its |
| 440 | * token instead of the qtd's. After the qtd is |
| 441 | * processed and removed, the overlay won't be valid |
| 442 | * any more. |
| 443 | */ |
| 444 | if (state == QH_STATE_IDLE && |
| 445 | qh->qtd_list.next == &qtd->qtd_list && |
| 446 | (hw->hw_token & ACTIVE_BIT(ehci))) { |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 447 | token = hc32_to_cpu(ehci, hw->hw_token); |
Alan Stern | feca774 | 2013-03-01 10:51:15 -0500 | [diff] [blame] | 448 | hw->hw_token &= ~ACTIVE_BIT(ehci); |
Alan Stern | fc0855f | 2015-11-20 13:53:58 -0500 | [diff] [blame] | 449 | qh->should_be_inactive = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | |
Alan Stern | 914b701 | 2009-06-29 10:47:30 -0400 | [diff] [blame] | 451 | /* An unlink may leave an incomplete |
| 452 | * async transaction in the TT buffer. |
| 453 | * We have to clear it. |
| 454 | */ |
| 455 | ehci_clear_tt_buffer(ehci, qh, urb, token); |
| 456 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | } |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 458 | |
David Brownell | 4f66762 | 2008-04-12 08:32:05 -0700 | [diff] [blame] | 459 | /* unless we already know the urb's status, collect qtd status |
| 460 | * and update count of bytes transferred. in common short read |
| 461 | * cases with only one data qtd (including control transfers), |
| 462 | * queue processing won't halt. but with two or more qtds (for |
| 463 | * example, with a 32 KB transfer), when the first qtd gets a |
| 464 | * short read the second must be removed by hand. |
| 465 | */ |
| 466 | if (last_status == -EINPROGRESS) { |
| 467 | last_status = qtd_copy_status(ehci, urb, |
| 468 | qtd->length, token); |
| 469 | if (last_status == -EREMOTEIO |
| 470 | && (qtd->hw_alt_next |
| 471 | & EHCI_LIST_END(ehci))) |
| 472 | last_status = -EINPROGRESS; |
Alan Stern | 914b701 | 2009-06-29 10:47:30 -0400 | [diff] [blame] | 473 | |
| 474 | /* As part of low/full-speed endpoint-halt processing |
| 475 | * we must clear the TT buffer (11.17.5). |
| 476 | */ |
| 477 | if (unlikely(last_status != -EINPROGRESS && |
Alan Stern | c2f6595 | 2009-11-18 11:37:15 -0500 | [diff] [blame] | 478 | last_status != -EREMOTEIO)) { |
| 479 | /* The TT's in some hubs malfunction when they |
| 480 | * receive this request following a STALL (they |
| 481 | * stop sending isochronous packets). Since a |
| 482 | * STALL can't leave the TT buffer in a busy |
| 483 | * state (if you believe Figures 11-48 - 11-51 |
| 484 | * in the USB 2.0 spec), we won't clear the TT |
| 485 | * buffer in this case. Strictly speaking this |
| 486 | * is a violation of the spec. |
| 487 | */ |
| 488 | if (last_status != -EPIPE) |
| 489 | ehci_clear_tt_buffer(ehci, qh, urb, |
| 490 | token); |
| 491 | } |
Alan Stern | b0d9efb | 2007-08-21 15:39:21 -0400 | [diff] [blame] | 492 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 494 | /* if we're removing something not at the queue head, |
| 495 | * patch the hardware queue pointer. |
| 496 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | if (stopped && qtd->qtd_list.prev != &qh->qtd_list) { |
| 498 | last = list_entry (qtd->qtd_list.prev, |
| 499 | struct ehci_qtd, qtd_list); |
| 500 | last->hw_next = qtd->hw_next; |
| 501 | } |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 502 | |
| 503 | /* remove qtd; it's recycled after possible urb completion */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | list_del (&qtd->qtd_list); |
| 505 | last = qtd; |
Alan Stern | a2c2706 | 2009-02-10 10:16:58 -0500 | [diff] [blame] | 506 | |
| 507 | /* reinit the xacterr counter for the next qtd */ |
Alan Stern | ef4638f | 2009-07-31 10:41:40 -0400 | [diff] [blame] | 508 | qh->xacterrs = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | } |
| 510 | |
| 511 | /* last urb's completion might still need calling */ |
| 512 | if (likely (last != NULL)) { |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 513 | ehci_urb_done(ehci, last->urb, last_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | ehci_qtd_free (ehci, last); |
| 515 | } |
| 516 | |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 517 | /* Do we need to rescan for URBs dequeued during a giveback? */ |
Alan Stern | 7bc782d | 2013-03-22 13:31:11 -0400 | [diff] [blame] | 518 | if (unlikely(qh->dequeue_during_giveback)) { |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 519 | /* If the QH is already unlinked, do the rescan now. */ |
| 520 | if (state == QH_STATE_IDLE) |
| 521 | goto rescan; |
| 522 | |
Alan Stern | 7bc782d | 2013-03-22 13:31:11 -0400 | [diff] [blame] | 523 | /* Otherwise the caller must unlink the QH. */ |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 524 | } |
| 525 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | /* restore original state; caller must unlink or relink */ |
| 527 | qh->qh_state = state; |
| 528 | |
| 529 | /* be sure the hardware's done with the qh before refreshing |
| 530 | * it after fault cleanup, or recovering from silicon wrongly |
| 531 | * overlaying the dummy qtd (which reduces DMA chatter). |
Alan Stern | 7bc782d | 2013-03-22 13:31:11 -0400 | [diff] [blame] | 532 | * |
| 533 | * We won't refresh a QH that's linked (after the HC |
| 534 | * stopped the queue). That avoids a race: |
| 535 | * - HC reads first part of QH; |
| 536 | * - CPU updates that first part and the token; |
| 537 | * - HC reads rest of that QH, including token |
| 538 | * Result: HC gets an inconsistent image, and then |
| 539 | * DMAs to/from the wrong memory (corrupting it). |
| 540 | * |
| 541 | * That should be rare for interrupt transfers, |
| 542 | * except maybe high bandwidth ... |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | */ |
Alan Stern | 7bc782d | 2013-03-22 13:31:11 -0400 | [diff] [blame] | 544 | if (stopped != 0 || hw->hw_qtd_next == EHCI_LIST_END(ehci)) |
Alan Stern | fcc5184 | 2016-01-25 15:42:04 -0500 | [diff] [blame] | 545 | qh->unlink_reason |= QH_UNLINK_DUMMY_OVERLAY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | |
Alan Stern | 7bc782d | 2013-03-22 13:31:11 -0400 | [diff] [blame] | 547 | /* Let the caller know if the QH needs to be unlinked. */ |
Alan Stern | fcc5184 | 2016-01-25 15:42:04 -0500 | [diff] [blame] | 548 | return qh->unlink_reason; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | } |
| 550 | |
| 551 | /*-------------------------------------------------------------------------*/ |
| 552 | |
| 553 | // high bandwidth multiplier, as encoded in highspeed endpoint descriptors |
| 554 | #define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03)) |
| 555 | // ... and packet size, for any kind of endpoint descriptor |
| 556 | #define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff) |
| 557 | |
| 558 | /* |
| 559 | * reverse of qh_urb_transaction: free a list of TDs. |
| 560 | * used for cleanup after errors, before HC sees an URB's TDs. |
| 561 | */ |
| 562 | static void qtd_list_free ( |
| 563 | struct ehci_hcd *ehci, |
| 564 | struct urb *urb, |
| 565 | struct list_head *qtd_list |
| 566 | ) { |
| 567 | struct list_head *entry, *temp; |
| 568 | |
| 569 | list_for_each_safe (entry, temp, qtd_list) { |
| 570 | struct ehci_qtd *qtd; |
| 571 | |
| 572 | qtd = list_entry (entry, struct ehci_qtd, qtd_list); |
| 573 | list_del (&qtd->qtd_list); |
| 574 | ehci_qtd_free (ehci, qtd); |
| 575 | } |
| 576 | } |
| 577 | |
| 578 | /* |
| 579 | * create a list of filled qtds for this URB; won't link into qh. |
| 580 | */ |
| 581 | static struct list_head * |
| 582 | qh_urb_transaction ( |
| 583 | struct ehci_hcd *ehci, |
| 584 | struct urb *urb, |
| 585 | struct list_head *head, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 586 | gfp_t flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | ) { |
| 588 | struct ehci_qtd *qtd, *qtd_prev; |
| 589 | dma_addr_t buf; |
Alan Stern | 40f8db8 | 2009-11-06 12:29:40 -0500 | [diff] [blame] | 590 | int len, this_sg_len, maxpacket; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | int is_input; |
| 592 | u32 token; |
Alan Stern | 40f8db8 | 2009-11-06 12:29:40 -0500 | [diff] [blame] | 593 | int i; |
| 594 | struct scatterlist *sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | |
| 596 | /* |
| 597 | * URBs map to sequences of QTDs: one logical transaction |
| 598 | */ |
| 599 | qtd = ehci_qtd_alloc (ehci, flags); |
| 600 | if (unlikely (!qtd)) |
| 601 | return NULL; |
| 602 | list_add_tail (&qtd->qtd_list, head); |
| 603 | qtd->urb = urb; |
| 604 | |
| 605 | token = QTD_STS_ACTIVE; |
| 606 | token |= (EHCI_TUNE_CERR << 10); |
| 607 | /* for split transactions, SplitXState initialized to zero */ |
| 608 | |
| 609 | len = urb->transfer_buffer_length; |
| 610 | is_input = usb_pipein (urb->pipe); |
| 611 | if (usb_pipecontrol (urb->pipe)) { |
| 612 | /* SETUP pid */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 613 | qtd_fill(ehci, qtd, urb->setup_dma, |
| 614 | sizeof (struct usb_ctrlrequest), |
| 615 | token | (2 /* "setup" */ << 8), 8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | |
| 617 | /* ... and always at least one more pid */ |
| 618 | token ^= QTD_TOGGLE; |
| 619 | qtd_prev = qtd; |
| 620 | qtd = ehci_qtd_alloc (ehci, flags); |
| 621 | if (unlikely (!qtd)) |
| 622 | goto cleanup; |
| 623 | qtd->urb = urb; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 624 | qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | list_add_tail (&qtd->qtd_list, head); |
Alan Stern | 6912354 | 2005-11-03 11:44:49 -0500 | [diff] [blame] | 626 | |
| 627 | /* for zero length DATA stages, STATUS is always IN */ |
| 628 | if (len == 0) |
| 629 | token |= (1 /* "in" */ << 8); |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 630 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | |
| 632 | /* |
| 633 | * data transfer stage: buffer setup |
| 634 | */ |
Clemens Ladisch | bc677d5 | 2011-12-03 23:41:31 +0100 | [diff] [blame] | 635 | i = urb->num_mapped_sgs; |
Alan Stern | 40f8db8 | 2009-11-06 12:29:40 -0500 | [diff] [blame] | 636 | if (len > 0 && i > 0) { |
Matthew Wilcox | 910f8d0 | 2010-05-01 12:20:01 -0600 | [diff] [blame] | 637 | sg = urb->sg; |
Alan Stern | 40f8db8 | 2009-11-06 12:29:40 -0500 | [diff] [blame] | 638 | buf = sg_dma_address(sg); |
| 639 | |
| 640 | /* urb->transfer_buffer_length may be smaller than the |
| 641 | * size of the scatterlist (or vice versa) |
| 642 | */ |
| 643 | this_sg_len = min_t(int, sg_dma_len(sg), len); |
| 644 | } else { |
| 645 | sg = NULL; |
| 646 | buf = urb->transfer_dma; |
| 647 | this_sg_len = len; |
| 648 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | |
Alan Stern | 6912354 | 2005-11-03 11:44:49 -0500 | [diff] [blame] | 650 | if (is_input) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | token |= (1 /* "in" */ << 8); |
| 652 | /* else it's already initted to "out" pid (0 << 8) */ |
| 653 | |
| 654 | maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input)); |
| 655 | |
| 656 | /* |
| 657 | * buffer gets wrapped in one or more qtds; |
| 658 | * last one may be "short" (including zero len) |
| 659 | * and may serve as a control status ack |
| 660 | */ |
| 661 | for (;;) { |
| 662 | int this_qtd_len; |
| 663 | |
Alan Stern | 40f8db8 | 2009-11-06 12:29:40 -0500 | [diff] [blame] | 664 | this_qtd_len = qtd_fill(ehci, qtd, buf, this_sg_len, token, |
| 665 | maxpacket); |
| 666 | this_sg_len -= this_qtd_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | len -= this_qtd_len; |
| 668 | buf += this_qtd_len; |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 669 | |
| 670 | /* |
| 671 | * short reads advance to a "magic" dummy instead of the next |
| 672 | * qtd ... that forces the queue to stop, for manual cleanup. |
| 673 | * (this will usually be overridden later.) |
| 674 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | if (is_input) |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 676 | qtd->hw_alt_next = ehci->async->hw->hw_alt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
| 678 | /* qh makes control packets use qtd toggle; maybe switch it */ |
| 679 | if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0) |
| 680 | token ^= QTD_TOGGLE; |
| 681 | |
Alan Stern | 40f8db8 | 2009-11-06 12:29:40 -0500 | [diff] [blame] | 682 | if (likely(this_sg_len <= 0)) { |
| 683 | if (--i <= 0 || len <= 0) |
| 684 | break; |
| 685 | sg = sg_next(sg); |
| 686 | buf = sg_dma_address(sg); |
| 687 | this_sg_len = min_t(int, sg_dma_len(sg), len); |
| 688 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | |
| 690 | qtd_prev = qtd; |
| 691 | qtd = ehci_qtd_alloc (ehci, flags); |
| 692 | if (unlikely (!qtd)) |
| 693 | goto cleanup; |
| 694 | qtd->urb = urb; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 695 | qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | list_add_tail (&qtd->qtd_list, head); |
| 697 | } |
| 698 | |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 699 | /* |
| 700 | * unless the caller requires manual cleanup after short reads, |
| 701 | * have the alt_next mechanism keep the queue running after the |
| 702 | * last data qtd (the only one, for control and most other cases). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | */ |
| 704 | if (likely ((urb->transfer_flags & URB_SHORT_NOT_OK) == 0 |
| 705 | || usb_pipecontrol (urb->pipe))) |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 706 | qtd->hw_alt_next = EHCI_LIST_END(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | |
| 708 | /* |
| 709 | * control requests may need a terminating data "status" ack; |
Ming Lei | 9a971dd | 2011-09-05 21:05:56 +0800 | [diff] [blame] | 710 | * other OUT ones may need a terminating short packet |
| 711 | * (zero length). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | */ |
Alan Stern | 6912354 | 2005-11-03 11:44:49 -0500 | [diff] [blame] | 713 | if (likely (urb->transfer_buffer_length != 0)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | int one_more = 0; |
| 715 | |
| 716 | if (usb_pipecontrol (urb->pipe)) { |
| 717 | one_more = 1; |
| 718 | token ^= 0x0100; /* "in" <--> "out" */ |
| 719 | token |= QTD_TOGGLE; /* force DATA1 */ |
Ming Lei | 9a971dd | 2011-09-05 21:05:56 +0800 | [diff] [blame] | 720 | } else if (usb_pipeout(urb->pipe) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | && (urb->transfer_flags & URB_ZERO_PACKET) |
| 722 | && !(urb->transfer_buffer_length % maxpacket)) { |
| 723 | one_more = 1; |
| 724 | } |
| 725 | if (one_more) { |
| 726 | qtd_prev = qtd; |
| 727 | qtd = ehci_qtd_alloc (ehci, flags); |
| 728 | if (unlikely (!qtd)) |
| 729 | goto cleanup; |
| 730 | qtd->urb = urb; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 731 | qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | list_add_tail (&qtd->qtd_list, head); |
| 733 | |
| 734 | /* never any data in such packets */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 735 | qtd_fill(ehci, qtd, 0, 0, token, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | } |
| 737 | } |
| 738 | |
| 739 | /* by default, enable interrupt on urb completion */ |
| 740 | if (likely (!(urb->transfer_flags & URB_NO_INTERRUPT))) |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 741 | qtd->hw_token |= cpu_to_hc32(ehci, QTD_IOC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | return head; |
| 743 | |
| 744 | cleanup: |
| 745 | qtd_list_free (ehci, urb, head); |
| 746 | return NULL; |
| 747 | } |
| 748 | |
| 749 | /*-------------------------------------------------------------------------*/ |
| 750 | |
| 751 | // Would be best to create all qh's from config descriptors, |
| 752 | // when each interface/altsetting is established. Unlink |
| 753 | // any previous qh and cancel its urbs first; endpoints are |
| 754 | // implicitly reset then (data toggle too). |
| 755 | // That'd mean updating how usbcore talks to HCDs. (2.7?) |
| 756 | |
| 757 | |
| 758 | /* |
| 759 | * Each QH holds a qtd list; a QH is used for everything except iso. |
| 760 | * |
| 761 | * For interrupt urbs, the scheduler must set the microframe scheduling |
| 762 | * mask(s) each time the QH gets scheduled. For highspeed, that's |
| 763 | * just one microframe in the s-mask. For split interrupt transactions |
| 764 | * there are additional complications: c-mask, maybe FSTNs. |
| 765 | */ |
| 766 | static struct ehci_qh * |
| 767 | qh_make ( |
| 768 | struct ehci_hcd *ehci, |
| 769 | struct urb *urb, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 770 | gfp_t flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | ) { |
| 772 | struct ehci_qh *qh = ehci_qh_alloc (ehci, flags); |
| 773 | u32 info1 = 0, info2 = 0; |
| 774 | int is_input, type; |
| 775 | int maxp = 0; |
David Brownell | 340ba5f | 2007-12-19 11:30:39 -0800 | [diff] [blame] | 776 | struct usb_tt *tt = urb->dev->tt; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 777 | struct ehci_qh_hw *hw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | |
| 779 | if (!qh) |
| 780 | return qh; |
| 781 | |
| 782 | /* |
| 783 | * init endpoint/device data for this QH |
| 784 | */ |
| 785 | info1 |= usb_pipeendpoint (urb->pipe) << 8; |
| 786 | info1 |= usb_pipedevice (urb->pipe) << 0; |
| 787 | |
| 788 | is_input = usb_pipein (urb->pipe); |
| 789 | type = usb_pipetype (urb->pipe); |
| 790 | maxp = usb_maxpacket (urb->dev, urb->pipe, !is_input); |
| 791 | |
David Brownell | caa9ef6 | 2008-02-08 15:08:44 -0800 | [diff] [blame] | 792 | /* 1024 byte maxpacket is a hardware ceiling. High bandwidth |
| 793 | * acts like up to 3KB, but is built from smaller packets. |
| 794 | */ |
| 795 | if (max_packet(maxp) > 1024) { |
| 796 | ehci_dbg(ehci, "bogus qh maxpacket %d\n", max_packet(maxp)); |
| 797 | goto done; |
| 798 | } |
| 799 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | /* Compute interrupt scheduling parameters just once, and save. |
| 801 | * - allowing for high bandwidth, how many nsec/uframe are used? |
| 802 | * - split transactions need a second CSPLIT uframe; same question |
| 803 | * - splits also need a schedule gap (for full/low speed I/O) |
| 804 | * - qh has a polling interval |
| 805 | * |
| 806 | * For control/bulk requests, the HC or TT handles these. |
| 807 | */ |
| 808 | if (type == PIPE_INTERRUPT) { |
Alan Stern | d0ce5c6 | 2013-10-11 11:29:13 -0400 | [diff] [blame] | 809 | unsigned tmp; |
| 810 | |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame] | 811 | qh->ps.usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH, |
David Brownell | 340ba5f | 2007-12-19 11:30:39 -0800 | [diff] [blame] | 812 | is_input, 0, |
| 813 | hb_mult(maxp) * max_packet(maxp))); |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame] | 814 | qh->ps.phase = NO_FRAME; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | |
| 816 | if (urb->dev->speed == USB_SPEED_HIGH) { |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame] | 817 | qh->ps.c_usecs = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | qh->gap_uf = 0; |
| 819 | |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame] | 820 | if (urb->interval > 1 && urb->interval < 8) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | /* NOTE interval 2 or 4 uframes could work. |
| 822 | * But interval 1 scheduling is simpler, and |
| 823 | * includes high bandwidth. |
| 824 | */ |
Alan Stern | 1b9a38b | 2010-01-08 11:17:55 -0500 | [diff] [blame] | 825 | urb->interval = 1; |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame] | 826 | } else if (urb->interval > ehci->periodic_size << 3) { |
| 827 | urb->interval = ehci->periodic_size << 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | } |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame] | 829 | qh->ps.period = urb->interval >> 3; |
Alan Stern | d0ce5c6 | 2013-10-11 11:29:13 -0400 | [diff] [blame] | 830 | |
| 831 | /* period for bandwidth allocation */ |
| 832 | tmp = min_t(unsigned, EHCI_BANDWIDTH_SIZE, |
| 833 | 1 << (urb->ep->desc.bInterval - 1)); |
| 834 | |
| 835 | /* Allow urb->interval to override */ |
| 836 | qh->ps.bw_uperiod = min_t(unsigned, tmp, urb->interval); |
| 837 | qh->ps.bw_period = qh->ps.bw_uperiod >> 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | } else { |
david-b@pacbell.net | d038420 | 2005-08-13 18:44:58 -0700 | [diff] [blame] | 839 | int think_time; |
| 840 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | /* gap is f(FS/LS transfer times) */ |
| 842 | qh->gap_uf = 1 + usb_calc_bus_time (urb->dev->speed, |
| 843 | is_input, 0, maxp) / (125 * 1000); |
| 844 | |
| 845 | /* FIXME this just approximates SPLIT/CSPLIT times */ |
| 846 | if (is_input) { // SPLIT, gap, CSPLIT+DATA |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame] | 847 | qh->ps.c_usecs = qh->ps.usecs + HS_USECS(0); |
| 848 | qh->ps.usecs = HS_USECS(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | } else { // SPLIT+DATA, gap, CSPLIT |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame] | 850 | qh->ps.usecs += HS_USECS(1); |
| 851 | qh->ps.c_usecs = HS_USECS(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | } |
| 853 | |
david-b@pacbell.net | d038420 | 2005-08-13 18:44:58 -0700 | [diff] [blame] | 854 | think_time = tt ? tt->think_time : 0; |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame] | 855 | qh->ps.tt_usecs = NS_TO_US(think_time + |
david-b@pacbell.net | d038420 | 2005-08-13 18:44:58 -0700 | [diff] [blame] | 856 | usb_calc_bus_time (urb->dev->speed, |
| 857 | is_input, 0, max_packet (maxp))); |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame] | 858 | if (urb->interval > ehci->periodic_size) |
| 859 | urb->interval = ehci->periodic_size; |
| 860 | qh->ps.period = urb->interval; |
Alan Stern | d0ce5c6 | 2013-10-11 11:29:13 -0400 | [diff] [blame] | 861 | |
| 862 | /* period for bandwidth allocation */ |
| 863 | tmp = min_t(unsigned, EHCI_BANDWIDTH_FRAMES, |
| 864 | urb->ep->desc.bInterval); |
| 865 | tmp = rounddown_pow_of_two(tmp); |
| 866 | |
| 867 | /* Allow urb->interval to override */ |
| 868 | qh->ps.bw_period = min_t(unsigned, tmp, urb->interval); |
| 869 | qh->ps.bw_uperiod = qh->ps.bw_period << 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | } |
| 871 | } |
| 872 | |
| 873 | /* support for tt scheduling, and access to toggles */ |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame] | 874 | qh->ps.udev = urb->dev; |
| 875 | qh->ps.ep = urb->ep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | |
| 877 | /* using TT? */ |
| 878 | switch (urb->dev->speed) { |
| 879 | case USB_SPEED_LOW: |
Alan Stern | 4c53de7 | 2012-07-11 11:21:32 -0400 | [diff] [blame] | 880 | info1 |= QH_LOW_SPEED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | /* FALL THROUGH */ |
| 882 | |
| 883 | case USB_SPEED_FULL: |
| 884 | /* EPS 0 means "full" */ |
| 885 | if (type != PIPE_INTERRUPT) |
| 886 | info1 |= (EHCI_TUNE_RL_TT << 28); |
| 887 | if (type == PIPE_CONTROL) { |
Alan Stern | 4c53de7 | 2012-07-11 11:21:32 -0400 | [diff] [blame] | 888 | info1 |= QH_CONTROL_EP; /* for TT */ |
| 889 | info1 |= QH_TOGGLE_CTL; /* toggle from qtd */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | } |
| 891 | info1 |= maxp << 16; |
| 892 | |
| 893 | info2 |= (EHCI_TUNE_MULT_TT << 30); |
Kumar Gala | 8cd42e9 | 2006-01-20 13:57:52 -0800 | [diff] [blame] | 894 | |
| 895 | /* Some Freescale processors have an erratum in which the |
| 896 | * port number in the queue head was 0..N-1 instead of 1..N. |
| 897 | */ |
| 898 | if (ehci_has_fsl_portno_bug(ehci)) |
| 899 | info2 |= (urb->dev->ttport-1) << 23; |
| 900 | else |
| 901 | info2 |= urb->dev->ttport << 23; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | |
| 903 | /* set the address of the TT; for TDI's integrated |
| 904 | * root hub tt, leave it zeroed. |
| 905 | */ |
David Brownell | 340ba5f | 2007-12-19 11:30:39 -0800 | [diff] [blame] | 906 | if (tt && tt->hub != ehci_to_hcd(ehci)->self.root_hub) |
| 907 | info2 |= tt->hub->devnum << 16; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | |
| 909 | /* NOTE: if (PIPE_INTERRUPT) { scheduler sets c-mask } */ |
| 910 | |
| 911 | break; |
| 912 | |
| 913 | case USB_SPEED_HIGH: /* no TT involved */ |
Alan Stern | 4c53de7 | 2012-07-11 11:21:32 -0400 | [diff] [blame] | 914 | info1 |= QH_HIGH_SPEED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | if (type == PIPE_CONTROL) { |
| 916 | info1 |= (EHCI_TUNE_RL_HS << 28); |
| 917 | info1 |= 64 << 16; /* usb2 fixed maxpacket */ |
Alan Stern | 4c53de7 | 2012-07-11 11:21:32 -0400 | [diff] [blame] | 918 | info1 |= QH_TOGGLE_CTL; /* toggle from qtd */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | info2 |= (EHCI_TUNE_MULT_HS << 30); |
| 920 | } else if (type == PIPE_BULK) { |
| 921 | info1 |= (EHCI_TUNE_RL_HS << 28); |
David Brownell | caa9ef6 | 2008-02-08 15:08:44 -0800 | [diff] [blame] | 922 | /* The USB spec says that high speed bulk endpoints |
| 923 | * always use 512 byte maxpacket. But some device |
| 924 | * vendors decided to ignore that, and MSFT is happy |
| 925 | * to help them do so. So now people expect to use |
| 926 | * such nonconformant devices with Linux too; sigh. |
| 927 | */ |
| 928 | info1 |= max_packet(maxp) << 16; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | info2 |= (EHCI_TUNE_MULT_HS << 30); |
| 930 | } else { /* PIPE_INTERRUPT */ |
| 931 | info1 |= max_packet (maxp) << 16; |
| 932 | info2 |= hb_mult (maxp) << 30; |
| 933 | } |
| 934 | break; |
| 935 | default: |
Vamsi Krishna Samavedam | f826f83 | 2016-11-03 17:06:34 -0700 | [diff] [blame] | 936 | ehci_dbg(ehci, "bogus dev %pK speed %d\n", urb->dev, |
Greg Kroah-Hartman | 82491c2 | 2012-05-01 21:33:35 -0700 | [diff] [blame] | 937 | urb->dev->speed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | done: |
Alan Stern | c83e1a9 | 2012-07-11 11:21:25 -0400 | [diff] [blame] | 939 | qh_destroy(ehci, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | return NULL; |
| 941 | } |
| 942 | |
| 943 | /* NOTE: if (PIPE_INTERRUPT) { scheduler sets s-mask } */ |
| 944 | |
Alan Stern | c1fdb68 | 2013-03-22 13:30:43 -0400 | [diff] [blame] | 945 | /* init as live, toggle clear */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | qh->qh_state = QH_STATE_IDLE; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 947 | hw = qh->hw; |
| 948 | hw->hw_info1 = cpu_to_hc32(ehci, info1); |
| 949 | hw->hw_info2 = cpu_to_hc32(ehci, info2); |
Alan Stern | e04f5f7 | 2011-07-19 14:01:23 -0400 | [diff] [blame] | 950 | qh->is_out = !is_input; |
Alan Stern | a455212d | 2009-06-11 14:56:22 -0400 | [diff] [blame] | 951 | usb_settoggle (urb->dev, usb_pipeendpoint (urb->pipe), !is_input, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | return qh; |
| 953 | } |
| 954 | |
| 955 | /*-------------------------------------------------------------------------*/ |
| 956 | |
Alan Stern | 3144661 | 2012-07-11 11:22:21 -0400 | [diff] [blame] | 957 | static void enable_async(struct ehci_hcd *ehci) |
| 958 | { |
| 959 | if (ehci->async_count++) |
| 960 | return; |
| 961 | |
| 962 | /* Stop waiting to turn off the async schedule */ |
| 963 | ehci->enabled_hrtimer_events &= ~BIT(EHCI_HRTIMER_DISABLE_ASYNC); |
| 964 | |
| 965 | /* Don't start the schedule until ASS is 0 */ |
| 966 | ehci_poll_ASS(ehci); |
Alan Stern | 18aafe6 | 2012-07-11 11:23:04 -0400 | [diff] [blame] | 967 | turn_on_io_watchdog(ehci); |
Alan Stern | 3144661 | 2012-07-11 11:22:21 -0400 | [diff] [blame] | 968 | } |
| 969 | |
| 970 | static void disable_async(struct ehci_hcd *ehci) |
| 971 | { |
| 972 | if (--ehci->async_count) |
| 973 | return; |
| 974 | |
Alan Stern | 6e01875 | 2013-03-22 13:31:45 -0400 | [diff] [blame] | 975 | /* The async schedule and unlink lists are supposed to be empty */ |
| 976 | WARN_ON(ehci->async->qh_next.qh || !list_empty(&ehci->async_unlink) || |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 977 | !list_empty(&ehci->async_idle)); |
Alan Stern | 3144661 | 2012-07-11 11:22:21 -0400 | [diff] [blame] | 978 | |
| 979 | /* Don't turn off the schedule until ASS is 1 */ |
| 980 | ehci_poll_ASS(ehci); |
| 981 | } |
| 982 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | /* move qh (and its qtds) onto async queue; maybe enable queue. */ |
| 984 | |
| 985 | static void qh_link_async (struct ehci_hcd *ehci, struct ehci_qh *qh) |
| 986 | { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 987 | __hc32 dma = QH_NEXT(ehci, qh->qh_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | struct ehci_qh *head; |
| 989 | |
Alan Stern | 914b701 | 2009-06-29 10:47:30 -0400 | [diff] [blame] | 990 | /* Don't link a QH if there's a Clear-TT-Buffer pending */ |
| 991 | if (unlikely(qh->clearing_tt)) |
| 992 | return; |
| 993 | |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 994 | WARN_ON(qh->qh_state != QH_STATE_IDLE); |
| 995 | |
Alan Stern | a455212d | 2009-06-11 14:56:22 -0400 | [diff] [blame] | 996 | /* clear halt and/or toggle; and maybe recover from silicon quirk */ |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 997 | qh_refresh(ehci, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | |
| 999 | /* splice right after start */ |
Alan Stern | 3144661 | 2012-07-11 11:22:21 -0400 | [diff] [blame] | 1000 | head = ehci->async; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | qh->qh_next = head->qh_next; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 1002 | qh->hw->hw_next = head->hw->hw_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | wmb (); |
| 1004 | |
| 1005 | head->qh_next.qh = qh; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 1006 | head->hw->hw_next = dma; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | |
| 1008 | qh->qh_state = QH_STATE_LINKED; |
Alan Stern | 7bc782d | 2013-03-22 13:31:11 -0400 | [diff] [blame] | 1009 | qh->xacterrs = 0; |
Alan Stern | fcc5184 | 2016-01-25 15:42:04 -0500 | [diff] [blame] | 1010 | qh->unlink_reason = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | /* qtd completions reported later by interrupt */ |
Alan Stern | 3144661 | 2012-07-11 11:22:21 -0400 | [diff] [blame] | 1012 | |
| 1013 | enable_async(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | } |
| 1015 | |
| 1016 | /*-------------------------------------------------------------------------*/ |
| 1017 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | /* |
| 1019 | * For control/bulk/interrupt, return QH with these TDs appended. |
| 1020 | * Allocates and initializes the QH if necessary. |
| 1021 | * Returns null if it can't allocate a QH it needs to. |
| 1022 | * If the QH has TDs (urbs) already, that's great. |
| 1023 | */ |
| 1024 | static struct ehci_qh *qh_append_tds ( |
| 1025 | struct ehci_hcd *ehci, |
| 1026 | struct urb *urb, |
| 1027 | struct list_head *qtd_list, |
| 1028 | int epnum, |
| 1029 | void **ptr |
| 1030 | ) |
| 1031 | { |
| 1032 | struct ehci_qh *qh = NULL; |
Al Viro | fd05e72 | 2008-04-28 07:00:16 +0100 | [diff] [blame] | 1033 | __hc32 qh_addr_mask = cpu_to_hc32(ehci, 0x7f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | |
| 1035 | qh = (struct ehci_qh *) *ptr; |
| 1036 | if (unlikely (qh == NULL)) { |
| 1037 | /* can't sleep here, we have ehci->lock... */ |
| 1038 | qh = qh_make (ehci, urb, GFP_ATOMIC); |
| 1039 | *ptr = qh; |
| 1040 | } |
| 1041 | if (likely (qh != NULL)) { |
| 1042 | struct ehci_qtd *qtd; |
| 1043 | |
| 1044 | if (unlikely (list_empty (qtd_list))) |
| 1045 | qtd = NULL; |
| 1046 | else |
| 1047 | qtd = list_entry (qtd_list->next, struct ehci_qtd, |
| 1048 | qtd_list); |
| 1049 | |
| 1050 | /* control qh may need patching ... */ |
| 1051 | if (unlikely (epnum == 0)) { |
| 1052 | |
| 1053 | /* usb_reset_device() briefly reverts to address 0 */ |
| 1054 | if (usb_pipedevice (urb->pipe) == 0) |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 1055 | qh->hw->hw_info1 &= ~qh_addr_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | } |
| 1057 | |
| 1058 | /* just one way to queue requests: swap with the dummy qtd. |
| 1059 | * only hc or qh_refresh() ever modify the overlay. |
| 1060 | */ |
| 1061 | if (likely (qtd != NULL)) { |
| 1062 | struct ehci_qtd *dummy; |
| 1063 | dma_addr_t dma; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1064 | __hc32 token; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | |
| 1066 | /* to avoid racing the HC, use the dummy td instead of |
| 1067 | * the first td of our list (becomes new dummy). both |
| 1068 | * tds stay deactivated until we're done, when the |
| 1069 | * HC is allowed to fetch the old dummy (4.10.2). |
| 1070 | */ |
| 1071 | token = qtd->hw_token; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1072 | qtd->hw_token = HALT_BIT(ehci); |
Ming Lei | 41f05de | 2011-09-05 21:05:58 +0800 | [diff] [blame] | 1073 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | dummy = qh->dummy; |
| 1075 | |
| 1076 | dma = dummy->qtd_dma; |
| 1077 | *dummy = *qtd; |
| 1078 | dummy->qtd_dma = dma; |
| 1079 | |
| 1080 | list_del (&qtd->qtd_list); |
| 1081 | list_add (&dummy->qtd_list, qtd_list); |
Luis R. Rodriguez | 7d283ae | 2008-08-06 15:21:26 -0700 | [diff] [blame] | 1082 | list_splice_tail(qtd_list, &qh->qtd_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1084 | ehci_qtd_init(ehci, qtd, qtd->qtd_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | qh->dummy = qtd; |
| 1086 | |
| 1087 | /* hc must see the new dummy at list end */ |
| 1088 | dma = qtd->qtd_dma; |
| 1089 | qtd = list_entry (qh->qtd_list.prev, |
| 1090 | struct ehci_qtd, qtd_list); |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1091 | qtd->hw_next = QTD_NEXT(ehci, dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | |
| 1093 | /* let the hc process these next qtds */ |
| 1094 | wmb (); |
| 1095 | dummy->hw_token = token; |
| 1096 | |
Alan Stern | c83e1a9 | 2012-07-11 11:21:25 -0400 | [diff] [blame] | 1097 | urb->hcpriv = qh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | } |
| 1099 | } |
| 1100 | return qh; |
| 1101 | } |
| 1102 | |
| 1103 | /*-------------------------------------------------------------------------*/ |
| 1104 | |
| 1105 | static int |
| 1106 | submit_async ( |
| 1107 | struct ehci_hcd *ehci, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | struct urb *urb, |
| 1109 | struct list_head *qtd_list, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 1110 | gfp_t mem_flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | int epnum; |
| 1113 | unsigned long flags; |
| 1114 | struct ehci_qh *qh = NULL; |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1115 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1117 | epnum = urb->ep->desc.bEndpointAddress; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | |
| 1119 | #ifdef EHCI_URB_TRACE |
David Daney | eb34a90 | 2011-01-25 09:59:36 -0800 | [diff] [blame] | 1120 | { |
| 1121 | struct ehci_qtd *qtd; |
| 1122 | qtd = list_entry(qtd_list->next, struct ehci_qtd, qtd_list); |
| 1123 | ehci_dbg(ehci, |
Vamsi Krishna Samavedam | f826f83 | 2016-11-03 17:06:34 -0700 | [diff] [blame] | 1124 | "%s %s urb %pK ep%d%s len %d, qtd %pK [qh %pK]\n", |
David Daney | eb34a90 | 2011-01-25 09:59:36 -0800 | [diff] [blame] | 1125 | __func__, urb->dev->devpath, urb, |
| 1126 | epnum & 0x0f, (epnum & USB_DIR_IN) ? "in" : "out", |
| 1127 | urb->transfer_buffer_length, |
| 1128 | qtd, urb->ep->hcpriv); |
| 1129 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | #endif |
| 1131 | |
| 1132 | spin_lock_irqsave (&ehci->lock, flags); |
Alan Stern | 541c7d4 | 2010-06-22 16:39:10 -0400 | [diff] [blame] | 1133 | if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) { |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1134 | rc = -ESHUTDOWN; |
| 1135 | goto done; |
| 1136 | } |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1137 | rc = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb); |
| 1138 | if (unlikely(rc)) |
| 1139 | goto done; |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1140 | |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1141 | qh = qh_append_tds(ehci, urb, qtd_list, epnum, &urb->ep->hcpriv); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1142 | if (unlikely(qh == NULL)) { |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1143 | usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1144 | rc = -ENOMEM; |
| 1145 | goto done; |
| 1146 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | |
| 1148 | /* Control/bulk operations through TTs don't need scheduling, |
| 1149 | * the HC and TT handle it when the TT has a buffer ready. |
| 1150 | */ |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1151 | if (likely (qh->qh_state == QH_STATE_IDLE)) |
Alan Stern | 7a0f0d9 | 2009-07-31 10:40:22 -0400 | [diff] [blame] | 1152 | qh_link_async(ehci, qh); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1153 | done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | spin_unlock_irqrestore (&ehci->lock, flags); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1155 | if (unlikely (qh == NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | qtd_list_free (ehci, urb, qtd_list); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1157 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | } |
| 1159 | |
| 1160 | /*-------------------------------------------------------------------------*/ |
Jack Pham | 726a85c | 2013-08-13 13:40:13 -0700 | [diff] [blame] | 1161 | #ifdef CONFIG_USB_HCD_TEST_MODE |
Manu Gautam | 9841f37 | 2013-08-08 16:49:24 -0700 | [diff] [blame] | 1162 | /* |
| 1163 | * This function creates the qtds and submits them for the |
| 1164 | * SINGLE_STEP_SET_FEATURE Test. |
| 1165 | * This is done in two parts: first SETUP req for GetDesc is sent then |
| 1166 | * 15 seconds later, the IN stage for GetDesc starts to req data from dev |
| 1167 | * |
| 1168 | * is_setup : i/p arguement decides which of the two stage needs to be |
| 1169 | * performed; TRUE - SETUP and FALSE - IN+STATUS |
| 1170 | * Returns 0 if success |
| 1171 | */ |
| 1172 | static int submit_single_step_set_feature( |
| 1173 | struct usb_hcd *hcd, |
| 1174 | struct urb *urb, |
| 1175 | int is_setup |
| 1176 | ) { |
| 1177 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); |
| 1178 | struct list_head qtd_list; |
| 1179 | struct list_head *head; |
| 1180 | |
| 1181 | struct ehci_qtd *qtd, *qtd_prev; |
| 1182 | dma_addr_t buf; |
| 1183 | int len, maxpacket; |
| 1184 | u32 token; |
| 1185 | |
| 1186 | INIT_LIST_HEAD(&qtd_list); |
| 1187 | head = &qtd_list; |
| 1188 | |
| 1189 | /* URBs map to sequences of QTDs: one logical transaction */ |
| 1190 | qtd = ehci_qtd_alloc(ehci, GFP_KERNEL); |
| 1191 | if (unlikely(!qtd)) |
| 1192 | return -1; |
| 1193 | list_add_tail(&qtd->qtd_list, head); |
| 1194 | qtd->urb = urb; |
| 1195 | |
| 1196 | token = QTD_STS_ACTIVE; |
| 1197 | token |= (EHCI_TUNE_CERR << 10); |
| 1198 | |
| 1199 | len = urb->transfer_buffer_length; |
| 1200 | /* |
| 1201 | * Check if the request is to perform just the SETUP stage (getDesc) |
| 1202 | * as in SINGLE_STEP_SET_FEATURE test, DATA stage (IN) happens |
| 1203 | * 15 secs after the setup |
| 1204 | */ |
| 1205 | if (is_setup) { |
| 1206 | /* SETUP pid */ |
| 1207 | qtd_fill(ehci, qtd, urb->setup_dma, |
| 1208 | sizeof(struct usb_ctrlrequest), |
| 1209 | token | (2 /* "setup" */ << 8), 8); |
| 1210 | |
| 1211 | submit_async(ehci, urb, &qtd_list, GFP_ATOMIC); |
| 1212 | return 0; /*Return now; we shall come back after 15 seconds*/ |
| 1213 | } |
| 1214 | |
| 1215 | /* |
| 1216 | * IN: data transfer stage: buffer setup : start the IN txn phase for |
| 1217 | * the get_Desc SETUP which was sent 15seconds back |
| 1218 | */ |
| 1219 | token ^= QTD_TOGGLE; /*We need to start IN with DATA-1 Pid-sequence*/ |
| 1220 | buf = urb->transfer_dma; |
| 1221 | |
| 1222 | token |= (1 /* "in" */ << 8); /*This is IN stage*/ |
| 1223 | |
| 1224 | maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, 0)); |
| 1225 | |
| 1226 | qtd_fill(ehci, qtd, buf, len, token, maxpacket); |
| 1227 | |
| 1228 | /* |
| 1229 | * Our IN phase shall always be a short read; so keep the queue running |
| 1230 | * and let it advance to the next qtd which zero length OUT status |
| 1231 | */ |
| 1232 | qtd->hw_alt_next = EHCI_LIST_END(ehci); |
| 1233 | |
| 1234 | /* STATUS stage for GetDesc control request */ |
| 1235 | token ^= 0x0100; /* "in" <--> "out" */ |
| 1236 | token |= QTD_TOGGLE; /* force DATA1 */ |
| 1237 | |
| 1238 | qtd_prev = qtd; |
| 1239 | qtd = ehci_qtd_alloc(ehci, GFP_ATOMIC); |
| 1240 | if (unlikely(!qtd)) |
| 1241 | goto cleanup; |
| 1242 | qtd->urb = urb; |
| 1243 | qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma); |
| 1244 | list_add_tail(&qtd->qtd_list, head); |
| 1245 | |
| 1246 | /* dont fill any data in such packets */ |
| 1247 | qtd_fill(ehci, qtd, 0, 0, token, 0); |
| 1248 | |
| 1249 | /* by default, enable interrupt on urb completion */ |
| 1250 | if (likely(!(urb->transfer_flags & URB_NO_INTERRUPT))) |
| 1251 | qtd->hw_token |= cpu_to_hc32(ehci, QTD_IOC); |
| 1252 | |
| 1253 | submit_async(ehci, urb, &qtd_list, GFP_KERNEL); |
| 1254 | |
| 1255 | return 0; |
| 1256 | |
| 1257 | cleanup: |
| 1258 | qtd_list_free(ehci, urb, head); |
| 1259 | return -1; |
| 1260 | } |
Jack Pham | 726a85c | 2013-08-13 13:40:13 -0700 | [diff] [blame] | 1261 | #endif /* CONFIG_USB_HCD_TEST_MODE */ |
Manu Gautam | 9841f37 | 2013-08-08 16:49:24 -0700 | [diff] [blame] | 1262 | |
| 1263 | /*-------------------------------------------------------------------------*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1265 | 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] | 1266 | { |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1267 | struct ehci_qh *prev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1269 | /* 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] | 1270 | qh->qh_state = QH_STATE_UNLINK_WAIT; |
Alan Stern | 6e01875 | 2013-03-22 13:31:45 -0400 | [diff] [blame] | 1271 | list_add_tail(&qh->unlink_node, &ehci->async_unlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1273 | /* Unlink it from the schedule */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | prev = ehci->async; |
| 1275 | while (prev->qh_next.qh != qh) |
| 1276 | prev = prev->qh_next.qh; |
| 1277 | |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 1278 | prev->hw->hw_next = qh->hw->hw_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | prev->qh_next = qh->qh_next; |
Alan Stern | 004c196 | 2011-07-05 12:34:05 -0400 | [diff] [blame] | 1280 | if (ehci->qh_scan_next == qh) |
| 1281 | ehci->qh_scan_next = qh->qh_next.qh; |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1282 | } |
| 1283 | |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 1284 | static void start_iaa_cycle(struct ehci_hcd *ehci) |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1285 | { |
Alan Stern | 391016f | 2009-03-16 14:21:56 -0400 | [diff] [blame] | 1286 | /* 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] | 1287 | if (unlikely(ehci->rh_state < EHCI_RH_RUNNING)) { |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 1288 | end_unlink_async(ehci); |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1289 | |
Alan Stern | f96fba0 | 2016-01-25 15:44:16 -0500 | [diff] [blame] | 1290 | /* Otherwise start a new IAA cycle if one isn't already running */ |
| 1291 | } else if (ehci->rh_state == EHCI_RH_RUNNING && |
| 1292 | !ehci->iaa_in_progress) { |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1293 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1294 | /* Make sure the unlinks are all visible to the hardware */ |
| 1295 | wmb(); |
| 1296 | |
| 1297 | ehci_writel(ehci, ehci->command | CMD_IAAD, |
| 1298 | &ehci->regs->command); |
| 1299 | ehci_readl(ehci, &ehci->regs->command); |
Alan Stern | f96fba0 | 2016-01-25 15:44:16 -0500 | [diff] [blame] | 1300 | ehci->iaa_in_progress = true; |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1301 | ehci_enable_event(ehci, EHCI_HRTIMER_IAA_WATCHDOG, true); |
| 1302 | } |
| 1303 | } |
| 1304 | |
Alan Stern | f96fba0 | 2016-01-25 15:44:16 -0500 | [diff] [blame] | 1305 | static void end_iaa_cycle(struct ehci_hcd *ehci) |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1306 | { |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1307 | if (ehci->has_synopsys_hc_bug) |
| 1308 | ehci_writel(ehci, (u32) ehci->async->qh_dma, |
| 1309 | &ehci->regs->async_next); |
| 1310 | |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 1311 | /* The current IAA cycle has ended */ |
| 1312 | ehci->iaa_in_progress = false; |
| 1313 | |
Alan Stern | f96fba0 | 2016-01-25 15:44:16 -0500 | [diff] [blame] | 1314 | end_unlink_async(ehci); |
| 1315 | } |
| 1316 | |
| 1317 | /* See if the async qh for the qtds being unlinked are now gone from the HC */ |
| 1318 | |
| 1319 | static void end_unlink_async(struct ehci_hcd *ehci) |
| 1320 | { |
| 1321 | struct ehci_qh *qh; |
| 1322 | bool early_exit; |
| 1323 | |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 1324 | if (list_empty(&ehci->async_unlink)) |
| 1325 | return; |
| 1326 | qh = list_first_entry(&ehci->async_unlink, struct ehci_qh, |
| 1327 | unlink_node); /* QH whose IAA cycle just ended */ |
| 1328 | |
| 1329 | /* |
| 1330 | * If async_unlinking is set then this routine is already running, |
| 1331 | * either on the stack or on another CPU. |
| 1332 | */ |
| 1333 | early_exit = ehci->async_unlinking; |
| 1334 | |
| 1335 | /* If the controller isn't running, process all the waiting QHs */ |
| 1336 | if (ehci->rh_state < EHCI_RH_RUNNING) |
| 1337 | list_splice_tail_init(&ehci->async_unlink, &ehci->async_idle); |
| 1338 | |
| 1339 | /* |
| 1340 | * Intel (?) bug: The HC can write back the overlay region even |
| 1341 | * after the IAA interrupt occurs. In self-defense, always go |
| 1342 | * through two IAA cycles for each QH. |
| 1343 | */ |
Alan Stern | 87d6191 | 2016-01-25 15:45:25 -0500 | [diff] [blame] | 1344 | else if (qh->qh_state == QH_STATE_UNLINK) { |
| 1345 | /* |
| 1346 | * Second IAA cycle has finished. Process only the first |
| 1347 | * waiting QH (NVIDIA (?) bug). |
| 1348 | */ |
| 1349 | list_move_tail(&qh->unlink_node, &ehci->async_idle); |
| 1350 | } |
| 1351 | |
| 1352 | /* |
| 1353 | * AMD/ATI (?) bug: The HC can continue to use an active QH long |
| 1354 | * after the IAA interrupt occurs. To prevent problems, QHs that |
| 1355 | * may still be active will wait until 2 ms have passed with no |
| 1356 | * change to the hw_current and hw_token fields (this delay occurs |
| 1357 | * between the two IAA cycles). |
| 1358 | * |
| 1359 | * The EHCI spec (4.8.2) says that active QHs must not be removed |
| 1360 | * from the async schedule and recommends waiting until the QH |
| 1361 | * goes inactive. This is ridiculous because the QH will _never_ |
| 1362 | * become inactive if the endpoint NAKs indefinitely. |
| 1363 | */ |
| 1364 | |
| 1365 | /* Some reasons for unlinking guarantee the QH can't be active */ |
| 1366 | else if (qh->unlink_reason & (QH_UNLINK_HALTED | |
| 1367 | QH_UNLINK_SHORT_READ | QH_UNLINK_DUMMY_OVERLAY)) |
| 1368 | goto DelayDone; |
| 1369 | |
| 1370 | /* The QH can't be active if the queue was and still is empty... */ |
| 1371 | else if ((qh->unlink_reason & QH_UNLINK_QUEUE_EMPTY) && |
| 1372 | list_empty(&qh->qtd_list)) |
| 1373 | goto DelayDone; |
| 1374 | |
| 1375 | /* ... or if the QH has halted */ |
| 1376 | else if (qh->hw->hw_token & cpu_to_hc32(ehci, QTD_STS_HALT)) |
| 1377 | goto DelayDone; |
| 1378 | |
| 1379 | /* Otherwise we have to wait until the QH stops changing */ |
| 1380 | else { |
| 1381 | __hc32 qh_current, qh_token; |
| 1382 | |
| 1383 | qh_current = qh->hw->hw_current; |
| 1384 | qh_token = qh->hw->hw_token; |
| 1385 | if (qh_current != ehci->old_current || |
| 1386 | qh_token != ehci->old_token) { |
| 1387 | ehci->old_current = qh_current; |
| 1388 | ehci->old_token = qh_token; |
| 1389 | ehci_enable_event(ehci, |
| 1390 | EHCI_HRTIMER_ACTIVE_UNLINK, true); |
| 1391 | return; |
| 1392 | } |
| 1393 | DelayDone: |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 1394 | qh->qh_state = QH_STATE_UNLINK; |
| 1395 | early_exit = true; |
| 1396 | } |
Alan Stern | 87d6191 | 2016-01-25 15:45:25 -0500 | [diff] [blame] | 1397 | ehci->old_current = ~0; /* Prepare for next QH */ |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 1398 | |
| 1399 | /* Start a new IAA cycle if any QHs are waiting for it */ |
| 1400 | if (!list_empty(&ehci->async_unlink)) |
| 1401 | start_iaa_cycle(ehci); |
| 1402 | |
| 1403 | /* |
| 1404 | * Don't allow nesting or concurrent calls, |
| 1405 | * or wait for the second IAA cycle for the next QH. |
| 1406 | */ |
| 1407 | if (early_exit) |
| 1408 | return; |
| 1409 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1410 | /* Process the idle QHs */ |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1411 | ehci->async_unlinking = true; |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 1412 | while (!list_empty(&ehci->async_idle)) { |
| 1413 | qh = list_first_entry(&ehci->async_idle, struct ehci_qh, |
Alan Stern | 6e01875 | 2013-03-22 13:31:45 -0400 | [diff] [blame] | 1414 | unlink_node); |
| 1415 | list_del(&qh->unlink_node); |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1416 | |
| 1417 | qh->qh_state = QH_STATE_IDLE; |
| 1418 | qh->qh_next.qh = NULL; |
| 1419 | |
Alan Stern | 79bcf7b | 2013-03-22 13:30:56 -0400 | [diff] [blame] | 1420 | if (!list_empty(&qh->qtd_list)) |
| 1421 | qh_completions(ehci, qh); |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1422 | if (!list_empty(&qh->qtd_list) && |
| 1423 | ehci->rh_state == EHCI_RH_RUNNING) |
| 1424 | qh_link_async(ehci, qh); |
| 1425 | disable_async(ehci); |
| 1426 | } |
| 1427 | ehci->async_unlinking = false; |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1428 | } |
| 1429 | |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1430 | static void start_unlink_async(struct ehci_hcd *ehci, struct ehci_qh *qh); |
| 1431 | |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1432 | static void unlink_empty_async(struct ehci_hcd *ehci) |
| 1433 | { |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1434 | struct ehci_qh *qh; |
| 1435 | struct ehci_qh *qh_to_unlink = NULL; |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1436 | int count = 0; |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1437 | |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1438 | /* Find the last async QH which has been empty for a timer cycle */ |
| 1439 | 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] | 1440 | if (list_empty(&qh->qtd_list) && |
| 1441 | qh->qh_state == QH_STATE_LINKED) { |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1442 | ++count; |
Alan Stern | afc2c9a | 2013-03-22 13:32:10 -0400 | [diff] [blame] | 1443 | if (qh->unlink_cycle != ehci->async_unlink_cycle) |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1444 | qh_to_unlink = qh; |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1445 | } |
| 1446 | } |
| 1447 | |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1448 | /* If nothing else is being unlinked, unlink the last empty QH */ |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 1449 | if (list_empty(&ehci->async_unlink) && qh_to_unlink) { |
Alan Stern | fcc5184 | 2016-01-25 15:42:04 -0500 | [diff] [blame] | 1450 | qh_to_unlink->unlink_reason |= QH_UNLINK_QUEUE_EMPTY; |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1451 | start_unlink_async(ehci, qh_to_unlink); |
| 1452 | --count; |
| 1453 | } |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1454 | |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1455 | /* Other QHs will be handled later */ |
| 1456 | if (count > 0) { |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1457 | ehci_enable_event(ehci, EHCI_HRTIMER_ASYNC_UNLINKS, true); |
| 1458 | ++ehci->async_unlink_cycle; |
| 1459 | } |
| 1460 | } |
| 1461 | |
Alan Stern | 8df0d77 | 2016-01-25 15:45:38 -0500 | [diff] [blame] | 1462 | #ifdef CONFIG_PM |
| 1463 | |
Alan Stern | 2a40f32 | 2013-03-15 14:40:26 -0400 | [diff] [blame] | 1464 | /* The root hub is suspended; unlink all the async QHs */ |
Alan Stern | 8df0d77 | 2016-01-25 15:45:38 -0500 | [diff] [blame] | 1465 | static void unlink_empty_async_suspended(struct ehci_hcd *ehci) |
Alan Stern | 2a40f32 | 2013-03-15 14:40:26 -0400 | [diff] [blame] | 1466 | { |
| 1467 | struct ehci_qh *qh; |
| 1468 | |
| 1469 | while (ehci->async->qh_next.qh) { |
| 1470 | qh = ehci->async->qh_next.qh; |
| 1471 | WARN_ON(!list_empty(&qh->qtd_list)); |
| 1472 | single_unlink_async(ehci, qh); |
| 1473 | } |
Alan Stern | 2a40f32 | 2013-03-15 14:40:26 -0400 | [diff] [blame] | 1474 | } |
| 1475 | |
Alan Stern | 8df0d77 | 2016-01-25 15:45:38 -0500 | [diff] [blame] | 1476 | #endif |
| 1477 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1478 | /* makes sure the async qh will become idle */ |
| 1479 | /* caller must own ehci->lock */ |
| 1480 | |
| 1481 | static void start_unlink_async(struct ehci_hcd *ehci, struct ehci_qh *qh) |
| 1482 | { |
Alan Stern | 7bc782d | 2013-03-22 13:31:11 -0400 | [diff] [blame] | 1483 | /* If the QH isn't linked then there's nothing we can do. */ |
| 1484 | if (qh->qh_state != QH_STATE_LINKED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1486 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1487 | single_unlink_async(ehci, qh); |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 1488 | start_iaa_cycle(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1489 | } |
| 1490 | |
| 1491 | /*-------------------------------------------------------------------------*/ |
| 1492 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1493 | static void scan_async (struct ehci_hcd *ehci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | { |
| 1495 | struct ehci_qh *qh; |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1496 | bool check_unlinks_later = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1497 | |
Alan Stern | 004c196 | 2011-07-05 12:34:05 -0400 | [diff] [blame] | 1498 | ehci->qh_scan_next = ehci->async->qh_next.qh; |
| 1499 | while (ehci->qh_scan_next) { |
| 1500 | qh = ehci->qh_scan_next; |
| 1501 | ehci->qh_scan_next = qh->qh_next.qh; |
Alan Stern | 79bcf7b | 2013-03-22 13:30:56 -0400 | [diff] [blame] | 1502 | |
Alan Stern | 004c196 | 2011-07-05 12:34:05 -0400 | [diff] [blame] | 1503 | /* clean any finished work for this qh */ |
| 1504 | if (!list_empty(&qh->qtd_list)) { |
| 1505 | int temp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | |
Alan Stern | 004c196 | 2011-07-05 12:34:05 -0400 | [diff] [blame] | 1507 | /* |
| 1508 | * Unlinks could happen here; completion reporting |
| 1509 | * drops the lock. That's why ehci->qh_scan_next |
| 1510 | * always holds the next qh to scan; if the next qh |
| 1511 | * gets unlinked then ehci->qh_scan_next is adjusted |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1512 | * in single_unlink_async(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1513 | */ |
Alan Stern | 004c196 | 2011-07-05 12:34:05 -0400 | [diff] [blame] | 1514 | temp = qh_completions(ehci, qh); |
Alan Stern | 79bcf7b | 2013-03-22 13:30:56 -0400 | [diff] [blame] | 1515 | if (unlikely(temp)) { |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1516 | start_unlink_async(ehci, qh); |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1517 | } else if (list_empty(&qh->qtd_list) |
| 1518 | && qh->qh_state == QH_STATE_LINKED) { |
| 1519 | qh->unlink_cycle = ehci->async_unlink_cycle; |
| 1520 | check_unlinks_later = true; |
Alan Stern | 79bcf7b | 2013-03-22 13:30:56 -0400 | [diff] [blame] | 1521 | } |
Alan Stern | 004c196 | 2011-07-05 12:34:05 -0400 | [diff] [blame] | 1522 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | } |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1524 | |
| 1525 | /* |
| 1526 | * Unlink empty entries, reducing DMA usage as well |
| 1527 | * as HCD schedule-scanning costs. Delay for any qh |
| 1528 | * we just scanned, there's a not-unusual case that it |
| 1529 | * doesn't stay idle for long. |
| 1530 | */ |
| 1531 | if (check_unlinks_later && ehci->rh_state == EHCI_RH_RUNNING && |
| 1532 | !(ehci->enabled_hrtimer_events & |
| 1533 | BIT(EHCI_HRTIMER_ASYNC_UNLINKS))) { |
| 1534 | ehci_enable_event(ehci, EHCI_HRTIMER_ASYNC_UNLINKS, true); |
| 1535 | ++ehci->async_unlink_cycle; |
| 1536 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | } |