1356 lines
37 KiB
C
1356 lines
37 KiB
C
/*
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* Copyright (C) 2001-2004 by David Brownell
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* this file is part of ehci-hcd.c */
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/*-------------------------------------------------------------------------*/
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/*
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* EHCI hardware queue manipulation ... the core. QH/QTD manipulation.
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*
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* Control, bulk, and interrupt traffic all use "qh" lists. They list "qtd"
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* entries describing USB transactions, max 16-20kB/entry (with 4kB-aligned
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* buffers needed for the larger number). We use one QH per endpoint, queue
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* multiple urbs (all three types) per endpoint. URBs may need several qtds.
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*
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* ISO traffic uses "ISO TD" (itd, and sitd) records, and (along with
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* interrupts) needs careful scheduling. Performance improvements can be
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* an ongoing challenge. That's in "ehci-sched.c".
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*
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* USB 1.1 devices are handled (a) by "companion" OHCI or UHCI root hubs,
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* or otherwise through transaction translators (TTs) in USB 2.0 hubs using
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* (b) special fields in qh entries or (c) split iso entries. TTs will
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* buffer low/full speed data so the host collects it at high speed.
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*/
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/*-------------------------------------------------------------------------*/
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/* fill a qtd, returning how much of the buffer we were able to queue up */
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static int
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qtd_fill(struct ehci_hcd *ehci, struct ehci_qtd *qtd, dma_addr_t buf,
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size_t len, int token, int maxpacket)
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{
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int i, count;
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u64 addr = buf;
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/* one buffer entry per 4K ... first might be short or unaligned */
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qtd->hw_buf[0] = cpu_to_hc32(ehci, (u32)addr);
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qtd->hw_buf_hi[0] = cpu_to_hc32(ehci, (u32)(addr >> 32));
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count = 0x1000 - (buf & 0x0fff); /* rest of that page */
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if (likely (len < count)) /* ... iff needed */
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count = len;
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else {
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buf += 0x1000;
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buf &= ~0x0fff;
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/* per-qtd limit: from 16K to 20K (best alignment) */
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for (i = 1; count < len && i < 5; i++) {
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addr = buf;
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qtd->hw_buf[i] = cpu_to_hc32(ehci, (u32)addr);
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qtd->hw_buf_hi[i] = cpu_to_hc32(ehci,
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(u32)(addr >> 32));
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buf += 0x1000;
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if ((count + 0x1000) < len)
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count += 0x1000;
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else
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count = len;
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}
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/* short packets may only terminate transfers */
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if (count != len)
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count -= (count % maxpacket);
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}
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qtd->hw_token = cpu_to_hc32(ehci, (count << 16) | token);
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qtd->length = count;
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return count;
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}
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/*-------------------------------------------------------------------------*/
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static inline void
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qh_update (struct ehci_hcd *ehci, struct ehci_qh *qh, struct ehci_qtd *qtd)
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{
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struct ehci_qh_hw *hw = qh->hw;
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/* writes to an active overlay are unsafe */
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BUG_ON(qh->qh_state != QH_STATE_IDLE);
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hw->hw_qtd_next = QTD_NEXT(ehci, qtd->qtd_dma);
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hw->hw_alt_next = EHCI_LIST_END(ehci);
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/* Except for control endpoints, we make hardware maintain data
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* toggle (like OHCI) ... here (re)initialize the toggle in the QH,
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* and set the pseudo-toggle in udev. Only usb_clear_halt() will
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* ever clear it.
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*/
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if (!(hw->hw_info1 & cpu_to_hc32(ehci, QH_TOGGLE_CTL))) {
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unsigned is_out, epnum;
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is_out = qh->is_out;
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epnum = (hc32_to_cpup(ehci, &hw->hw_info1) >> 8) & 0x0f;
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if (unlikely (!usb_gettoggle (qh->dev, epnum, is_out))) {
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hw->hw_token &= ~cpu_to_hc32(ehci, QTD_TOGGLE);
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usb_settoggle (qh->dev, epnum, is_out, 1);
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}
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}
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hw->hw_token &= cpu_to_hc32(ehci, QTD_TOGGLE | QTD_STS_PING);
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}
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/* if it weren't for a common silicon quirk (writing the dummy into the qh
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* overlay, so qh->hw_token wrongly becomes inactive/halted), only fault
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* recovery (including urb dequeue) would need software changes to a QH...
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*/
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static void
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qh_refresh (struct ehci_hcd *ehci, struct ehci_qh *qh)
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{
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struct ehci_qtd *qtd;
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if (list_empty (&qh->qtd_list))
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qtd = qh->dummy;
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else {
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qtd = list_entry (qh->qtd_list.next,
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struct ehci_qtd, qtd_list);
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/* first qtd may already be partially processed */
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if (cpu_to_hc32(ehci, qtd->qtd_dma) == qh->hw->hw_current)
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qtd = NULL;
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}
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if (qtd)
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qh_update (ehci, qh, qtd);
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}
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/*-------------------------------------------------------------------------*/
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static void qh_link_async(struct ehci_hcd *ehci, struct ehci_qh *qh);
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static void ehci_clear_tt_buffer_complete(struct usb_hcd *hcd,
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struct usb_host_endpoint *ep)
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{
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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struct ehci_qh *qh = ep->hcpriv;
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unsigned long flags;
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spin_lock_irqsave(&ehci->lock, flags);
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qh->clearing_tt = 0;
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if (qh->qh_state == QH_STATE_IDLE && !list_empty(&qh->qtd_list)
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&& ehci->rh_state == EHCI_RH_RUNNING)
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qh_link_async(ehci, qh);
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spin_unlock_irqrestore(&ehci->lock, flags);
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}
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static void ehci_clear_tt_buffer(struct ehci_hcd *ehci, struct ehci_qh *qh,
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struct urb *urb, u32 token)
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{
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/* If an async split transaction gets an error or is unlinked,
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* the TT buffer may be left in an indeterminate state. We
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* have to clear the TT buffer.
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*
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* Note: this routine is never called for Isochronous transfers.
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*/
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if (urb->dev->tt && !usb_pipeint(urb->pipe) && !qh->clearing_tt) {
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#ifdef DEBUG
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struct usb_device *tt = urb->dev->tt->hub;
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dev_dbg(&tt->dev,
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"clear tt buffer port %d, a%d ep%d t%08x\n",
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urb->dev->ttport, urb->dev->devnum,
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usb_pipeendpoint(urb->pipe), token);
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#endif /* DEBUG */
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if (!ehci_is_TDI(ehci)
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|| urb->dev->tt->hub !=
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ehci_to_hcd(ehci)->self.root_hub) {
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if (usb_hub_clear_tt_buffer(urb) == 0)
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qh->clearing_tt = 1;
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} else {
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/* REVISIT ARC-derived cores don't clear the root
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* hub TT buffer in this way...
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*/
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}
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}
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}
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static int qtd_copy_status (
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struct ehci_hcd *ehci,
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struct urb *urb,
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size_t length,
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u32 token
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)
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{
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int status = -EINPROGRESS;
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/* count IN/OUT bytes, not SETUP (even short packets) */
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if (likely (QTD_PID (token) != 2))
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urb->actual_length += length - QTD_LENGTH (token);
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/* don't modify error codes */
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if (unlikely(urb->unlinked))
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return status;
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/* force cleanup after short read; not always an error */
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if (unlikely (IS_SHORT_READ (token)))
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status = -EREMOTEIO;
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/* serious "can't proceed" faults reported by the hardware */
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if (token & QTD_STS_HALT) {
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if (token & QTD_STS_BABBLE) {
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/* FIXME "must" disable babbling device's port too */
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status = -EOVERFLOW;
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/* CERR nonzero + halt --> stall */
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} else if (QTD_CERR(token)) {
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status = -EPIPE;
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/* In theory, more than one of the following bits can be set
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* since they are sticky and the transaction is retried.
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* Which to test first is rather arbitrary.
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*/
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} else if (token & QTD_STS_MMF) {
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/* fs/ls interrupt xfer missed the complete-split */
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status = -EPROTO;
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} else if (token & QTD_STS_DBE) {
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status = (QTD_PID (token) == 1) /* IN ? */
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? -ENOSR /* hc couldn't read data */
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: -ECOMM; /* hc couldn't write data */
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} else if (token & QTD_STS_XACT) {
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/* timeout, bad CRC, wrong PID, etc */
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ehci_dbg(ehci, "devpath %s ep%d%s 3strikes\n",
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urb->dev->devpath,
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usb_pipeendpoint(urb->pipe),
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usb_pipein(urb->pipe) ? "in" : "out");
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status = -EPROTO;
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} else { /* unknown */
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status = -EPROTO;
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}
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ehci_vdbg (ehci,
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"dev%d ep%d%s qtd token %08x --> status %d\n",
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usb_pipedevice (urb->pipe),
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usb_pipeendpoint (urb->pipe),
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usb_pipein (urb->pipe) ? "in" : "out",
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token, status);
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}
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return status;
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}
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static void
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ehci_urb_done(struct ehci_hcd *ehci, struct urb *urb, int status)
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__releases(ehci->lock)
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__acquires(ehci->lock)
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{
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if (likely (urb->hcpriv != NULL)) {
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struct ehci_qh *qh = (struct ehci_qh *) urb->hcpriv;
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/* S-mask in a QH means it's an interrupt urb */
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if ((qh->hw->hw_info2 & cpu_to_hc32(ehci, QH_SMASK)) != 0) {
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/* ... update hc-wide periodic stats (for usbfs) */
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ehci_to_hcd(ehci)->self.bandwidth_int_reqs--;
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}
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}
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if (unlikely(urb->unlinked)) {
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COUNT(ehci->stats.unlink);
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} else {
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/* report non-error and short read status as zero */
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if (status == -EINPROGRESS || status == -EREMOTEIO)
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status = 0;
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COUNT(ehci->stats.complete);
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}
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#ifdef EHCI_URB_TRACE
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ehci_dbg (ehci,
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"%s %s urb %p ep%d%s status %d len %d/%d\n",
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__func__, urb->dev->devpath, urb,
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usb_pipeendpoint (urb->pipe),
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usb_pipein (urb->pipe) ? "in" : "out",
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status,
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urb->actual_length, urb->transfer_buffer_length);
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#endif
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/* complete() can reenter this HCD */
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usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb);
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spin_unlock (&ehci->lock);
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usb_hcd_giveback_urb(ehci_to_hcd(ehci), urb, status);
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spin_lock (&ehci->lock);
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}
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static int qh_schedule (struct ehci_hcd *ehci, struct ehci_qh *qh);
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/*
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* Process and free completed qtds for a qh, returning URBs to drivers.
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* Chases up to qh->hw_current. Returns number of completions called,
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* indicating how much "real" work we did.
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*/
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static unsigned
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qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh)
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{
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struct ehci_qtd *last, *end = qh->dummy;
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struct list_head *entry, *tmp;
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int last_status;
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int stopped;
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unsigned count = 0;
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u8 state;
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struct ehci_qh_hw *hw = qh->hw;
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if (unlikely (list_empty (&qh->qtd_list)))
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return count;
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/* completions (or tasks on other cpus) must never clobber HALT
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* till we've gone through and cleaned everything up, even when
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* they add urbs to this qh's queue or mark them for unlinking.
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*
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* NOTE: unlinking expects to be done in queue order.
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*
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* It's a bug for qh->qh_state to be anything other than
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* QH_STATE_IDLE, unless our caller is scan_async() or
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* scan_intr().
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*/
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state = qh->qh_state;
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qh->qh_state = QH_STATE_COMPLETING;
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stopped = (state == QH_STATE_IDLE);
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rescan:
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last = NULL;
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last_status = -EINPROGRESS;
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qh->needs_rescan = 0;
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/* remove de-activated QTDs from front of queue.
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* after faults (including short reads), cleanup this urb
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* then let the queue advance.
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* if queue is stopped, handles unlinks.
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*/
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list_for_each_safe (entry, tmp, &qh->qtd_list) {
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struct ehci_qtd *qtd;
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struct urb *urb;
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u32 token = 0;
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qtd = list_entry (entry, struct ehci_qtd, qtd_list);
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urb = qtd->urb;
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/* clean up any state from previous QTD ...*/
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if (last) {
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if (likely (last->urb != urb)) {
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ehci_urb_done(ehci, last->urb, last_status);
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count++;
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last_status = -EINPROGRESS;
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}
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ehci_qtd_free (ehci, last);
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last = NULL;
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}
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/* ignore urbs submitted during completions we reported */
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if (qtd == end)
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break;
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/* hardware copies qtd out of qh overlay */
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rmb ();
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token = hc32_to_cpu(ehci, qtd->hw_token);
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/* always clean up qtds the hc de-activated */
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retry_xacterr:
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if ((token & QTD_STS_ACTIVE) == 0) {
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/* Report Data Buffer Error: non-fatal but useful */
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if (token & QTD_STS_DBE)
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ehci_dbg(ehci,
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"detected DataBufferErr for urb %p ep%d%s len %d, qtd %p [qh %p]\n",
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urb,
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usb_endpoint_num(&urb->ep->desc),
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usb_endpoint_dir_in(&urb->ep->desc) ? "in" : "out",
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urb->transfer_buffer_length,
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qtd,
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qh);
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/* on STALL, error, and short reads this urb must
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* complete and all its qtds must be recycled.
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*/
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if ((token & QTD_STS_HALT) != 0) {
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/* retry transaction errors until we
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* reach the software xacterr limit
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*/
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if ((token & QTD_STS_XACT) &&
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QTD_CERR(token) == 0 &&
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++qh->xacterrs < QH_XACTERR_MAX &&
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!urb->unlinked) {
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ehci_dbg(ehci,
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"detected XactErr len %zu/%zu retry %d\n",
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qtd->length - QTD_LENGTH(token), qtd->length, qh->xacterrs);
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/* reset the token in the qtd and the
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* qh overlay (which still contains
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* the qtd) so that we pick up from
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* where we left off
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*/
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token &= ~QTD_STS_HALT;
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token |= QTD_STS_ACTIVE |
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(EHCI_TUNE_CERR << 10);
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qtd->hw_token = cpu_to_hc32(ehci,
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token);
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wmb();
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hw->hw_token = cpu_to_hc32(ehci,
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token);
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goto retry_xacterr;
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}
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stopped = 1;
|
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|
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/* magic dummy for some short reads; qh won't advance.
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* that silicon quirk can kick in with this dummy too.
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*
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* other short reads won't stop the queue, including
|
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* control transfers (status stage handles that) or
|
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* most other single-qtd reads ... the queue stops if
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* URB_SHORT_NOT_OK was set so the driver submitting
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* the urbs could clean it up.
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*/
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} else if (IS_SHORT_READ (token)
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&& !(qtd->hw_alt_next
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& EHCI_LIST_END(ehci))) {
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stopped = 1;
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}
|
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|
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/* stop scanning when we reach qtds the hc is using */
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} else if (likely (!stopped
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&& ehci->rh_state >= EHCI_RH_RUNNING)) {
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break;
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|
|
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/* scan the whole queue for unlinks whenever it stops */
|
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} else {
|
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stopped = 1;
|
|
|
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/* cancel everything if we halt, suspend, etc */
|
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if (ehci->rh_state < EHCI_RH_RUNNING)
|
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last_status = -ESHUTDOWN;
|
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|
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/* this qtd is active; skip it unless a previous qtd
|
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* for its urb faulted, or its urb was canceled.
|
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*/
|
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else if (last_status == -EINPROGRESS && !urb->unlinked)
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continue;
|
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|
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/* qh unlinked; token in overlay may be most current */
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if (state == QH_STATE_IDLE
|
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&& cpu_to_hc32(ehci, qtd->qtd_dma)
|
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== hw->hw_current) {
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token = hc32_to_cpu(ehci, hw->hw_token);
|
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|
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/* An unlink may leave an incomplete
|
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* async transaction in the TT buffer.
|
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* We have to clear it.
|
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*/
|
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ehci_clear_tt_buffer(ehci, qh, urb, token);
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}
|
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}
|
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|
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/* unless we already know the urb's status, collect qtd status
|
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* and update count of bytes transferred. in common short read
|
|
* cases with only one data qtd (including control transfers),
|
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* queue processing won't halt. but with two or more qtds (for
|
|
* example, with a 32 KB transfer), when the first qtd gets a
|
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* short read the second must be removed by hand.
|
|
*/
|
|
if (last_status == -EINPROGRESS) {
|
|
last_status = qtd_copy_status(ehci, urb,
|
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qtd->length, token);
|
|
if (last_status == -EREMOTEIO
|
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&& (qtd->hw_alt_next
|
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& EHCI_LIST_END(ehci)))
|
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last_status = -EINPROGRESS;
|
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|
|
/* As part of low/full-speed endpoint-halt processing
|
|
* we must clear the TT buffer (11.17.5).
|
|
*/
|
|
if (unlikely(last_status != -EINPROGRESS &&
|
|
last_status != -EREMOTEIO)) {
|
|
/* The TT's in some hubs malfunction when they
|
|
* receive this request following a STALL (they
|
|
* stop sending isochronous packets). Since a
|
|
* STALL can't leave the TT buffer in a busy
|
|
* state (if you believe Figures 11-48 - 11-51
|
|
* in the USB 2.0 spec), we won't clear the TT
|
|
* buffer in this case. Strictly speaking this
|
|
* is a violation of the spec.
|
|
*/
|
|
if (last_status != -EPIPE)
|
|
ehci_clear_tt_buffer(ehci, qh, urb,
|
|
token);
|
|
}
|
|
}
|
|
|
|
/* if we're removing something not at the queue head,
|
|
* patch the hardware queue pointer.
|
|
*/
|
|
if (stopped && qtd->qtd_list.prev != &qh->qtd_list) {
|
|
last = list_entry (qtd->qtd_list.prev,
|
|
struct ehci_qtd, qtd_list);
|
|
last->hw_next = qtd->hw_next;
|
|
}
|
|
|
|
/* remove qtd; it's recycled after possible urb completion */
|
|
list_del (&qtd->qtd_list);
|
|
last = qtd;
|
|
|
|
/* reinit the xacterr counter for the next qtd */
|
|
qh->xacterrs = 0;
|
|
}
|
|
|
|
/* last urb's completion might still need calling */
|
|
if (likely (last != NULL)) {
|
|
ehci_urb_done(ehci, last->urb, last_status);
|
|
count++;
|
|
ehci_qtd_free (ehci, last);
|
|
}
|
|
|
|
/* Do we need to rescan for URBs dequeued during a giveback? */
|
|
if (unlikely(qh->needs_rescan)) {
|
|
/* If the QH is already unlinked, do the rescan now. */
|
|
if (state == QH_STATE_IDLE)
|
|
goto rescan;
|
|
|
|
/* Otherwise we have to wait until the QH is fully unlinked.
|
|
* Our caller will start an unlink if qh->needs_rescan is
|
|
* set. But if an unlink has already started, nothing needs
|
|
* to be done.
|
|
*/
|
|
if (state != QH_STATE_LINKED)
|
|
qh->needs_rescan = 0;
|
|
}
|
|
|
|
/* restore original state; caller must unlink or relink */
|
|
qh->qh_state = state;
|
|
|
|
/* be sure the hardware's done with the qh before refreshing
|
|
* it after fault cleanup, or recovering from silicon wrongly
|
|
* overlaying the dummy qtd (which reduces DMA chatter).
|
|
*/
|
|
if (stopped != 0 || hw->hw_qtd_next == EHCI_LIST_END(ehci)) {
|
|
switch (state) {
|
|
case QH_STATE_IDLE:
|
|
qh_refresh(ehci, qh);
|
|
break;
|
|
case QH_STATE_LINKED:
|
|
/* We won't refresh a QH that's linked (after the HC
|
|
* stopped the queue). That avoids a race:
|
|
* - HC reads first part of QH;
|
|
* - CPU updates that first part and the token;
|
|
* - HC reads rest of that QH, including token
|
|
* Result: HC gets an inconsistent image, and then
|
|
* DMAs to/from the wrong memory (corrupting it).
|
|
*
|
|
* That should be rare for interrupt transfers,
|
|
* except maybe high bandwidth ...
|
|
*/
|
|
|
|
/* Tell the caller to start an unlink */
|
|
qh->needs_rescan = 1;
|
|
break;
|
|
/* otherwise, unlink already started */
|
|
}
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
// high bandwidth multiplier, as encoded in highspeed endpoint descriptors
|
|
#define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))
|
|
// ... and packet size, for any kind of endpoint descriptor
|
|
#define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff)
|
|
|
|
/*
|
|
* reverse of qh_urb_transaction: free a list of TDs.
|
|
* used for cleanup after errors, before HC sees an URB's TDs.
|
|
*/
|
|
static void qtd_list_free (
|
|
struct ehci_hcd *ehci,
|
|
struct urb *urb,
|
|
struct list_head *qtd_list
|
|
) {
|
|
struct list_head *entry, *temp;
|
|
|
|
list_for_each_safe (entry, temp, qtd_list) {
|
|
struct ehci_qtd *qtd;
|
|
|
|
qtd = list_entry (entry, struct ehci_qtd, qtd_list);
|
|
list_del (&qtd->qtd_list);
|
|
ehci_qtd_free (ehci, qtd);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* create a list of filled qtds for this URB; won't link into qh.
|
|
*/
|
|
static struct list_head *
|
|
qh_urb_transaction (
|
|
struct ehci_hcd *ehci,
|
|
struct urb *urb,
|
|
struct list_head *head,
|
|
gfp_t flags
|
|
) {
|
|
struct ehci_qtd *qtd, *qtd_prev;
|
|
dma_addr_t buf;
|
|
int len, this_sg_len, maxpacket;
|
|
int is_input;
|
|
u32 token;
|
|
int i;
|
|
struct scatterlist *sg;
|
|
|
|
/*
|
|
* URBs map to sequences of QTDs: one logical transaction
|
|
*/
|
|
qtd = ehci_qtd_alloc (ehci, flags);
|
|
if (unlikely (!qtd))
|
|
return NULL;
|
|
list_add_tail (&qtd->qtd_list, head);
|
|
qtd->urb = urb;
|
|
|
|
token = QTD_STS_ACTIVE;
|
|
token |= (EHCI_TUNE_CERR << 10);
|
|
/* for split transactions, SplitXState initialized to zero */
|
|
|
|
len = urb->transfer_buffer_length;
|
|
is_input = usb_pipein (urb->pipe);
|
|
if (usb_pipecontrol (urb->pipe)) {
|
|
/* SETUP pid */
|
|
qtd_fill(ehci, qtd, urb->setup_dma,
|
|
sizeof (struct usb_ctrlrequest),
|
|
token | (2 /* "setup" */ << 8), 8);
|
|
|
|
/* ... and always at least one more pid */
|
|
token ^= QTD_TOGGLE;
|
|
qtd_prev = qtd;
|
|
qtd = ehci_qtd_alloc (ehci, flags);
|
|
if (unlikely (!qtd))
|
|
goto cleanup;
|
|
qtd->urb = urb;
|
|
qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma);
|
|
list_add_tail (&qtd->qtd_list, head);
|
|
|
|
/* for zero length DATA stages, STATUS is always IN */
|
|
if (len == 0)
|
|
token |= (1 /* "in" */ << 8);
|
|
}
|
|
|
|
/*
|
|
* data transfer stage: buffer setup
|
|
*/
|
|
i = urb->num_mapped_sgs;
|
|
if (len > 0 && i > 0) {
|
|
sg = urb->sg;
|
|
buf = sg_dma_address(sg);
|
|
|
|
/* urb->transfer_buffer_length may be smaller than the
|
|
* size of the scatterlist (or vice versa)
|
|
*/
|
|
this_sg_len = min_t(int, sg_dma_len(sg), len);
|
|
} else {
|
|
sg = NULL;
|
|
buf = urb->transfer_dma;
|
|
this_sg_len = len;
|
|
}
|
|
|
|
if (is_input)
|
|
token |= (1 /* "in" */ << 8);
|
|
/* else it's already initted to "out" pid (0 << 8) */
|
|
|
|
maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input));
|
|
|
|
/*
|
|
* buffer gets wrapped in one or more qtds;
|
|
* last one may be "short" (including zero len)
|
|
* and may serve as a control status ack
|
|
*/
|
|
for (;;) {
|
|
int this_qtd_len;
|
|
|
|
this_qtd_len = qtd_fill(ehci, qtd, buf, this_sg_len, token,
|
|
maxpacket);
|
|
this_sg_len -= this_qtd_len;
|
|
len -= this_qtd_len;
|
|
buf += this_qtd_len;
|
|
|
|
/*
|
|
* short reads advance to a "magic" dummy instead of the next
|
|
* qtd ... that forces the queue to stop, for manual cleanup.
|
|
* (this will usually be overridden later.)
|
|
*/
|
|
if (is_input)
|
|
qtd->hw_alt_next = ehci->async->hw->hw_alt_next;
|
|
|
|
/* qh makes control packets use qtd toggle; maybe switch it */
|
|
if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0)
|
|
token ^= QTD_TOGGLE;
|
|
|
|
if (likely(this_sg_len <= 0)) {
|
|
if (--i <= 0 || len <= 0)
|
|
break;
|
|
sg = sg_next(sg);
|
|
buf = sg_dma_address(sg);
|
|
this_sg_len = min_t(int, sg_dma_len(sg), len);
|
|
}
|
|
|
|
qtd_prev = qtd;
|
|
qtd = ehci_qtd_alloc (ehci, flags);
|
|
if (unlikely (!qtd))
|
|
goto cleanup;
|
|
qtd->urb = urb;
|
|
qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma);
|
|
list_add_tail (&qtd->qtd_list, head);
|
|
}
|
|
|
|
/*
|
|
* unless the caller requires manual cleanup after short reads,
|
|
* have the alt_next mechanism keep the queue running after the
|
|
* last data qtd (the only one, for control and most other cases).
|
|
*/
|
|
if (likely ((urb->transfer_flags & URB_SHORT_NOT_OK) == 0
|
|
|| usb_pipecontrol (urb->pipe)))
|
|
qtd->hw_alt_next = EHCI_LIST_END(ehci);
|
|
|
|
/*
|
|
* control requests may need a terminating data "status" ack;
|
|
* other OUT ones may need a terminating short packet
|
|
* (zero length).
|
|
*/
|
|
if (likely (urb->transfer_buffer_length != 0)) {
|
|
int one_more = 0;
|
|
|
|
if (usb_pipecontrol (urb->pipe)) {
|
|
one_more = 1;
|
|
token ^= 0x0100; /* "in" <--> "out" */
|
|
token |= QTD_TOGGLE; /* force DATA1 */
|
|
} else if (usb_pipeout(urb->pipe)
|
|
&& (urb->transfer_flags & URB_ZERO_PACKET)
|
|
&& !(urb->transfer_buffer_length % maxpacket)) {
|
|
one_more = 1;
|
|
}
|
|
if (one_more) {
|
|
qtd_prev = qtd;
|
|
qtd = ehci_qtd_alloc (ehci, flags);
|
|
if (unlikely (!qtd))
|
|
goto cleanup;
|
|
qtd->urb = urb;
|
|
qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma);
|
|
list_add_tail (&qtd->qtd_list, head);
|
|
|
|
/* never any data in such packets */
|
|
qtd_fill(ehci, qtd, 0, 0, token, 0);
|
|
}
|
|
}
|
|
|
|
/* by default, enable interrupt on urb completion */
|
|
if (likely (!(urb->transfer_flags & URB_NO_INTERRUPT)))
|
|
qtd->hw_token |= cpu_to_hc32(ehci, QTD_IOC);
|
|
return head;
|
|
|
|
cleanup:
|
|
qtd_list_free (ehci, urb, head);
|
|
return NULL;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
// Would be best to create all qh's from config descriptors,
|
|
// when each interface/altsetting is established. Unlink
|
|
// any previous qh and cancel its urbs first; endpoints are
|
|
// implicitly reset then (data toggle too).
|
|
// That'd mean updating how usbcore talks to HCDs. (2.7?)
|
|
|
|
|
|
/*
|
|
* Each QH holds a qtd list; a QH is used for everything except iso.
|
|
*
|
|
* For interrupt urbs, the scheduler must set the microframe scheduling
|
|
* mask(s) each time the QH gets scheduled. For highspeed, that's
|
|
* just one microframe in the s-mask. For split interrupt transactions
|
|
* there are additional complications: c-mask, maybe FSTNs.
|
|
*/
|
|
static struct ehci_qh *
|
|
qh_make (
|
|
struct ehci_hcd *ehci,
|
|
struct urb *urb,
|
|
gfp_t flags
|
|
) {
|
|
struct ehci_qh *qh = ehci_qh_alloc (ehci, flags);
|
|
u32 info1 = 0, info2 = 0;
|
|
int is_input, type;
|
|
int maxp = 0;
|
|
struct usb_tt *tt = urb->dev->tt;
|
|
struct ehci_qh_hw *hw;
|
|
|
|
if (!qh)
|
|
return qh;
|
|
|
|
/*
|
|
* init endpoint/device data for this QH
|
|
*/
|
|
info1 |= usb_pipeendpoint (urb->pipe) << 8;
|
|
info1 |= usb_pipedevice (urb->pipe) << 0;
|
|
|
|
is_input = usb_pipein (urb->pipe);
|
|
type = usb_pipetype (urb->pipe);
|
|
maxp = usb_maxpacket (urb->dev, urb->pipe, !is_input);
|
|
|
|
/* 1024 byte maxpacket is a hardware ceiling. High bandwidth
|
|
* acts like up to 3KB, but is built from smaller packets.
|
|
*/
|
|
if (max_packet(maxp) > 1024) {
|
|
ehci_dbg(ehci, "bogus qh maxpacket %d\n", max_packet(maxp));
|
|
goto done;
|
|
}
|
|
|
|
/* Compute interrupt scheduling parameters just once, and save.
|
|
* - allowing for high bandwidth, how many nsec/uframe are used?
|
|
* - split transactions need a second CSPLIT uframe; same question
|
|
* - splits also need a schedule gap (for full/low speed I/O)
|
|
* - qh has a polling interval
|
|
*
|
|
* For control/bulk requests, the HC or TT handles these.
|
|
*/
|
|
if (type == PIPE_INTERRUPT) {
|
|
qh->usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH,
|
|
is_input, 0,
|
|
hb_mult(maxp) * max_packet(maxp)));
|
|
qh->start = NO_FRAME;
|
|
|
|
if (urb->dev->speed == USB_SPEED_HIGH) {
|
|
qh->c_usecs = 0;
|
|
qh->gap_uf = 0;
|
|
|
|
qh->period = urb->interval >> 3;
|
|
if (qh->period == 0 && urb->interval != 1) {
|
|
/* NOTE interval 2 or 4 uframes could work.
|
|
* But interval 1 scheduling is simpler, and
|
|
* includes high bandwidth.
|
|
*/
|
|
urb->interval = 1;
|
|
} else if (qh->period > ehci->periodic_size) {
|
|
qh->period = ehci->periodic_size;
|
|
urb->interval = qh->period << 3;
|
|
}
|
|
} else {
|
|
int think_time;
|
|
|
|
/* gap is f(FS/LS transfer times) */
|
|
qh->gap_uf = 1 + usb_calc_bus_time (urb->dev->speed,
|
|
is_input, 0, maxp) / (125 * 1000);
|
|
|
|
/* FIXME this just approximates SPLIT/CSPLIT times */
|
|
if (is_input) { // SPLIT, gap, CSPLIT+DATA
|
|
qh->c_usecs = qh->usecs + HS_USECS (0);
|
|
qh->usecs = HS_USECS (1);
|
|
} else { // SPLIT+DATA, gap, CSPLIT
|
|
qh->usecs += HS_USECS (1);
|
|
qh->c_usecs = HS_USECS (0);
|
|
}
|
|
|
|
think_time = tt ? tt->think_time : 0;
|
|
qh->tt_usecs = NS_TO_US (think_time +
|
|
usb_calc_bus_time (urb->dev->speed,
|
|
is_input, 0, max_packet (maxp)));
|
|
qh->period = urb->interval;
|
|
if (qh->period > ehci->periodic_size) {
|
|
qh->period = ehci->periodic_size;
|
|
urb->interval = qh->period;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* support for tt scheduling, and access to toggles */
|
|
qh->dev = urb->dev;
|
|
|
|
/* using TT? */
|
|
switch (urb->dev->speed) {
|
|
case USB_SPEED_LOW:
|
|
info1 |= QH_LOW_SPEED;
|
|
/* FALL THROUGH */
|
|
|
|
case USB_SPEED_FULL:
|
|
/* EPS 0 means "full" */
|
|
if (type != PIPE_INTERRUPT)
|
|
info1 |= (EHCI_TUNE_RL_TT << 28);
|
|
if (type == PIPE_CONTROL) {
|
|
info1 |= QH_CONTROL_EP; /* for TT */
|
|
info1 |= QH_TOGGLE_CTL; /* toggle from qtd */
|
|
}
|
|
info1 |= maxp << 16;
|
|
|
|
info2 |= (EHCI_TUNE_MULT_TT << 30);
|
|
|
|
/* Some Freescale processors have an erratum in which the
|
|
* port number in the queue head was 0..N-1 instead of 1..N.
|
|
*/
|
|
if (ehci_has_fsl_portno_bug(ehci))
|
|
info2 |= (urb->dev->ttport-1) << 23;
|
|
else
|
|
info2 |= urb->dev->ttport << 23;
|
|
|
|
/* set the address of the TT; for TDI's integrated
|
|
* root hub tt, leave it zeroed.
|
|
*/
|
|
if (tt && tt->hub != ehci_to_hcd(ehci)->self.root_hub)
|
|
info2 |= tt->hub->devnum << 16;
|
|
|
|
/* NOTE: if (PIPE_INTERRUPT) { scheduler sets c-mask } */
|
|
|
|
break;
|
|
|
|
case USB_SPEED_HIGH: /* no TT involved */
|
|
info1 |= QH_HIGH_SPEED;
|
|
if (type == PIPE_CONTROL) {
|
|
info1 |= (EHCI_TUNE_RL_HS << 28);
|
|
info1 |= 64 << 16; /* usb2 fixed maxpacket */
|
|
info1 |= QH_TOGGLE_CTL; /* toggle from qtd */
|
|
info2 |= (EHCI_TUNE_MULT_HS << 30);
|
|
} else if (type == PIPE_BULK) {
|
|
info1 |= (EHCI_TUNE_RL_HS << 28);
|
|
/* The USB spec says that high speed bulk endpoints
|
|
* always use 512 byte maxpacket. But some device
|
|
* vendors decided to ignore that, and MSFT is happy
|
|
* to help them do so. So now people expect to use
|
|
* such nonconformant devices with Linux too; sigh.
|
|
*/
|
|
info1 |= max_packet(maxp) << 16;
|
|
info2 |= (EHCI_TUNE_MULT_HS << 30);
|
|
} else { /* PIPE_INTERRUPT */
|
|
info1 |= max_packet (maxp) << 16;
|
|
info2 |= hb_mult (maxp) << 30;
|
|
}
|
|
break;
|
|
default:
|
|
ehci_dbg(ehci, "bogus dev %p speed %d\n", urb->dev,
|
|
urb->dev->speed);
|
|
done:
|
|
qh_destroy(ehci, qh);
|
|
return NULL;
|
|
}
|
|
|
|
/* NOTE: if (PIPE_INTERRUPT) { scheduler sets s-mask } */
|
|
|
|
/* init as live, toggle clear, advance to dummy */
|
|
qh->qh_state = QH_STATE_IDLE;
|
|
hw = qh->hw;
|
|
hw->hw_info1 = cpu_to_hc32(ehci, info1);
|
|
hw->hw_info2 = cpu_to_hc32(ehci, info2);
|
|
qh->is_out = !is_input;
|
|
usb_settoggle (urb->dev, usb_pipeendpoint (urb->pipe), !is_input, 1);
|
|
qh_refresh (ehci, qh);
|
|
return qh;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static void enable_async(struct ehci_hcd *ehci)
|
|
{
|
|
if (ehci->async_count++)
|
|
return;
|
|
|
|
/* Stop waiting to turn off the async schedule */
|
|
ehci->enabled_hrtimer_events &= ~BIT(EHCI_HRTIMER_DISABLE_ASYNC);
|
|
|
|
/* Don't start the schedule until ASS is 0 */
|
|
ehci_poll_ASS(ehci);
|
|
}
|
|
|
|
static void disable_async(struct ehci_hcd *ehci)
|
|
{
|
|
if (--ehci->async_count)
|
|
return;
|
|
|
|
/* The async schedule and async_unlink list are supposed to be empty */
|
|
WARN_ON(ehci->async->qh_next.qh || ehci->async_unlink);
|
|
|
|
/* Don't turn off the schedule until ASS is 1 */
|
|
ehci_poll_ASS(ehci);
|
|
}
|
|
|
|
/* move qh (and its qtds) onto async queue; maybe enable queue. */
|
|
|
|
static void qh_link_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
|
|
{
|
|
__hc32 dma = QH_NEXT(ehci, qh->qh_dma);
|
|
struct ehci_qh *head;
|
|
|
|
/* Don't link a QH if there's a Clear-TT-Buffer pending */
|
|
if (unlikely(qh->clearing_tt))
|
|
return;
|
|
|
|
WARN_ON(qh->qh_state != QH_STATE_IDLE);
|
|
|
|
/* clear halt and/or toggle; and maybe recover from silicon quirk */
|
|
qh_refresh(ehci, qh);
|
|
|
|
/* splice right after start */
|
|
head = ehci->async;
|
|
qh->qh_next = head->qh_next;
|
|
qh->hw->hw_next = head->hw->hw_next;
|
|
wmb ();
|
|
|
|
head->qh_next.qh = qh;
|
|
head->hw->hw_next = dma;
|
|
|
|
qh->xacterrs = 0;
|
|
qh->qh_state = QH_STATE_LINKED;
|
|
/* qtd completions reported later by interrupt */
|
|
|
|
enable_async(ehci);
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/*
|
|
* For control/bulk/interrupt, return QH with these TDs appended.
|
|
* Allocates and initializes the QH if necessary.
|
|
* Returns null if it can't allocate a QH it needs to.
|
|
* If the QH has TDs (urbs) already, that's great.
|
|
*/
|
|
static struct ehci_qh *qh_append_tds (
|
|
struct ehci_hcd *ehci,
|
|
struct urb *urb,
|
|
struct list_head *qtd_list,
|
|
int epnum,
|
|
void **ptr
|
|
)
|
|
{
|
|
struct ehci_qh *qh = NULL;
|
|
__hc32 qh_addr_mask = cpu_to_hc32(ehci, 0x7f);
|
|
|
|
qh = (struct ehci_qh *) *ptr;
|
|
if (unlikely (qh == NULL)) {
|
|
/* can't sleep here, we have ehci->lock... */
|
|
qh = qh_make (ehci, urb, GFP_ATOMIC);
|
|
*ptr = qh;
|
|
}
|
|
if (likely (qh != NULL)) {
|
|
struct ehci_qtd *qtd;
|
|
|
|
if (unlikely (list_empty (qtd_list)))
|
|
qtd = NULL;
|
|
else
|
|
qtd = list_entry (qtd_list->next, struct ehci_qtd,
|
|
qtd_list);
|
|
|
|
/* control qh may need patching ... */
|
|
if (unlikely (epnum == 0)) {
|
|
|
|
/* usb_reset_device() briefly reverts to address 0 */
|
|
if (usb_pipedevice (urb->pipe) == 0)
|
|
qh->hw->hw_info1 &= ~qh_addr_mask;
|
|
}
|
|
|
|
/* just one way to queue requests: swap with the dummy qtd.
|
|
* only hc or qh_refresh() ever modify the overlay.
|
|
*/
|
|
if (likely (qtd != NULL)) {
|
|
struct ehci_qtd *dummy;
|
|
dma_addr_t dma;
|
|
__hc32 token;
|
|
|
|
/* to avoid racing the HC, use the dummy td instead of
|
|
* the first td of our list (becomes new dummy). both
|
|
* tds stay deactivated until we're done, when the
|
|
* HC is allowed to fetch the old dummy (4.10.2).
|
|
*/
|
|
token = qtd->hw_token;
|
|
qtd->hw_token = HALT_BIT(ehci);
|
|
|
|
dummy = qh->dummy;
|
|
|
|
dma = dummy->qtd_dma;
|
|
*dummy = *qtd;
|
|
dummy->qtd_dma = dma;
|
|
|
|
list_del (&qtd->qtd_list);
|
|
list_add (&dummy->qtd_list, qtd_list);
|
|
list_splice_tail(qtd_list, &qh->qtd_list);
|
|
|
|
ehci_qtd_init(ehci, qtd, qtd->qtd_dma);
|
|
qh->dummy = qtd;
|
|
|
|
/* hc must see the new dummy at list end */
|
|
dma = qtd->qtd_dma;
|
|
qtd = list_entry (qh->qtd_list.prev,
|
|
struct ehci_qtd, qtd_list);
|
|
qtd->hw_next = QTD_NEXT(ehci, dma);
|
|
|
|
/* let the hc process these next qtds */
|
|
wmb ();
|
|
dummy->hw_token = token;
|
|
|
|
urb->hcpriv = qh;
|
|
}
|
|
}
|
|
return qh;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static int
|
|
submit_async (
|
|
struct ehci_hcd *ehci,
|
|
struct urb *urb,
|
|
struct list_head *qtd_list,
|
|
gfp_t mem_flags
|
|
) {
|
|
int epnum;
|
|
unsigned long flags;
|
|
struct ehci_qh *qh = NULL;
|
|
int rc;
|
|
|
|
epnum = urb->ep->desc.bEndpointAddress;
|
|
|
|
#ifdef EHCI_URB_TRACE
|
|
{
|
|
struct ehci_qtd *qtd;
|
|
qtd = list_entry(qtd_list->next, struct ehci_qtd, qtd_list);
|
|
ehci_dbg(ehci,
|
|
"%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n",
|
|
__func__, urb->dev->devpath, urb,
|
|
epnum & 0x0f, (epnum & USB_DIR_IN) ? "in" : "out",
|
|
urb->transfer_buffer_length,
|
|
qtd, urb->ep->hcpriv);
|
|
}
|
|
#endif
|
|
|
|
spin_lock_irqsave (&ehci->lock, flags);
|
|
if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) {
|
|
rc = -ESHUTDOWN;
|
|
goto done;
|
|
}
|
|
rc = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb);
|
|
if (unlikely(rc))
|
|
goto done;
|
|
|
|
qh = qh_append_tds(ehci, urb, qtd_list, epnum, &urb->ep->hcpriv);
|
|
if (unlikely(qh == NULL)) {
|
|
usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb);
|
|
rc = -ENOMEM;
|
|
goto done;
|
|
}
|
|
|
|
/* Control/bulk operations through TTs don't need scheduling,
|
|
* the HC and TT handle it when the TT has a buffer ready.
|
|
*/
|
|
if (likely (qh->qh_state == QH_STATE_IDLE))
|
|
qh_link_async(ehci, qh);
|
|
done:
|
|
spin_unlock_irqrestore (&ehci->lock, flags);
|
|
if (unlikely (qh == NULL))
|
|
qtd_list_free (ehci, urb, qtd_list);
|
|
return rc;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static void single_unlink_async(struct ehci_hcd *ehci, struct ehci_qh *qh)
|
|
{
|
|
struct ehci_qh *prev;
|
|
|
|
/* Add to the end of the list of QHs waiting for the next IAAD */
|
|
qh->qh_state = QH_STATE_UNLINK;
|
|
if (ehci->async_unlink)
|
|
ehci->async_unlink_last->unlink_next = qh;
|
|
else
|
|
ehci->async_unlink = qh;
|
|
ehci->async_unlink_last = qh;
|
|
|
|
/* Unlink it from the schedule */
|
|
prev = ehci->async;
|
|
while (prev->qh_next.qh != qh)
|
|
prev = prev->qh_next.qh;
|
|
|
|
prev->hw->hw_next = qh->hw->hw_next;
|
|
prev->qh_next = qh->qh_next;
|
|
if (ehci->qh_scan_next == qh)
|
|
ehci->qh_scan_next = qh->qh_next.qh;
|
|
}
|
|
|
|
static void start_iaa_cycle(struct ehci_hcd *ehci, bool nested)
|
|
{
|
|
/*
|
|
* Do nothing if an IAA cycle is already running or
|
|
* if one will be started shortly.
|
|
*/
|
|
if (ehci->async_iaa || ehci->async_unlinking)
|
|
return;
|
|
|
|
/* Do all the waiting QHs at once */
|
|
ehci->async_iaa = ehci->async_unlink;
|
|
ehci->async_unlink = NULL;
|
|
|
|
/* If the controller isn't running, we don't have to wait for it */
|
|
if (unlikely(ehci->rh_state < EHCI_RH_RUNNING)) {
|
|
if (!nested) /* Avoid recursion */
|
|
end_unlink_async(ehci);
|
|
|
|
/* Otherwise start a new IAA cycle */
|
|
} else if (likely(ehci->rh_state == EHCI_RH_RUNNING)) {
|
|
/* Make sure the unlinks are all visible to the hardware */
|
|
wmb();
|
|
|
|
ehci_writel(ehci, ehci->command | CMD_IAAD,
|
|
&ehci->regs->command);
|
|
ehci_readl(ehci, &ehci->regs->command);
|
|
ehci_enable_event(ehci, EHCI_HRTIMER_IAA_WATCHDOG, true);
|
|
}
|
|
}
|
|
|
|
/* the async qh for the qtds being unlinked are now gone from the HC */
|
|
|
|
static void end_unlink_async(struct ehci_hcd *ehci)
|
|
{
|
|
struct ehci_qh *qh;
|
|
|
|
if (ehci->has_synopsys_hc_bug)
|
|
ehci_writel(ehci, (u32) ehci->async->qh_dma,
|
|
&ehci->regs->async_next);
|
|
|
|
/* Process the idle QHs */
|
|
restart:
|
|
ehci->async_unlinking = true;
|
|
while (ehci->async_iaa) {
|
|
qh = ehci->async_iaa;
|
|
ehci->async_iaa = qh->unlink_next;
|
|
qh->unlink_next = NULL;
|
|
|
|
qh->qh_state = QH_STATE_IDLE;
|
|
qh->qh_next.qh = NULL;
|
|
|
|
qh_completions(ehci, qh);
|
|
if (!list_empty(&qh->qtd_list) &&
|
|
ehci->rh_state == EHCI_RH_RUNNING)
|
|
qh_link_async(ehci, qh);
|
|
disable_async(ehci);
|
|
}
|
|
ehci->async_unlinking = false;
|
|
|
|
/* Start a new IAA cycle if any QHs are waiting for it */
|
|
if (ehci->async_unlink) {
|
|
start_iaa_cycle(ehci, true);
|
|
if (unlikely(ehci->rh_state < EHCI_RH_RUNNING))
|
|
goto restart;
|
|
}
|
|
}
|
|
|
|
static void unlink_empty_async(struct ehci_hcd *ehci)
|
|
{
|
|
struct ehci_qh *qh, *next;
|
|
bool stopped = (ehci->rh_state < EHCI_RH_RUNNING);
|
|
bool check_unlinks_later = false;
|
|
|
|
/* Unlink all the async QHs that have been empty for a timer cycle */
|
|
next = ehci->async->qh_next.qh;
|
|
while (next) {
|
|
qh = next;
|
|
next = qh->qh_next.qh;
|
|
|
|
if (list_empty(&qh->qtd_list) &&
|
|
qh->qh_state == QH_STATE_LINKED) {
|
|
if (!stopped && qh->unlink_cycle ==
|
|
ehci->async_unlink_cycle)
|
|
check_unlinks_later = true;
|
|
else
|
|
single_unlink_async(ehci, qh);
|
|
}
|
|
}
|
|
|
|
/* Start a new IAA cycle if any QHs are waiting for it */
|
|
if (ehci->async_unlink)
|
|
start_iaa_cycle(ehci, false);
|
|
|
|
/* QHs that haven't been empty for long enough will be handled later */
|
|
if (check_unlinks_later) {
|
|
ehci_enable_event(ehci, EHCI_HRTIMER_ASYNC_UNLINKS, true);
|
|
++ehci->async_unlink_cycle;
|
|
}
|
|
}
|
|
|
|
/* makes sure the async qh will become idle */
|
|
/* caller must own ehci->lock */
|
|
|
|
static void start_unlink_async(struct ehci_hcd *ehci, struct ehci_qh *qh)
|
|
{
|
|
/*
|
|
* If the QH isn't linked then there's nothing we can do
|
|
* unless we were called during a giveback, in which case
|
|
* qh_completions() has to deal with it.
|
|
*/
|
|
if (qh->qh_state != QH_STATE_LINKED) {
|
|
if (qh->qh_state == QH_STATE_COMPLETING)
|
|
qh->needs_rescan = 1;
|
|
return;
|
|
}
|
|
|
|
single_unlink_async(ehci, qh);
|
|
start_iaa_cycle(ehci, false);
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static void scan_async (struct ehci_hcd *ehci)
|
|
{
|
|
struct ehci_qh *qh;
|
|
bool check_unlinks_later = false;
|
|
|
|
ehci->qh_scan_next = ehci->async->qh_next.qh;
|
|
while (ehci->qh_scan_next) {
|
|
qh = ehci->qh_scan_next;
|
|
ehci->qh_scan_next = qh->qh_next.qh;
|
|
rescan:
|
|
/* clean any finished work for this qh */
|
|
if (!list_empty(&qh->qtd_list)) {
|
|
int temp;
|
|
|
|
/*
|
|
* Unlinks could happen here; completion reporting
|
|
* drops the lock. That's why ehci->qh_scan_next
|
|
* always holds the next qh to scan; if the next qh
|
|
* gets unlinked then ehci->qh_scan_next is adjusted
|
|
* in single_unlink_async().
|
|
*/
|
|
temp = qh_completions(ehci, qh);
|
|
if (qh->needs_rescan) {
|
|
start_unlink_async(ehci, qh);
|
|
} else if (list_empty(&qh->qtd_list)
|
|
&& qh->qh_state == QH_STATE_LINKED) {
|
|
qh->unlink_cycle = ehci->async_unlink_cycle;
|
|
check_unlinks_later = true;
|
|
} else if (temp != 0)
|
|
goto rescan;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Unlink empty entries, reducing DMA usage as well
|
|
* as HCD schedule-scanning costs. Delay for any qh
|
|
* we just scanned, there's a not-unusual case that it
|
|
* doesn't stay idle for long.
|
|
*/
|
|
if (check_unlinks_later && ehci->rh_state == EHCI_RH_RUNNING &&
|
|
!(ehci->enabled_hrtimer_events &
|
|
BIT(EHCI_HRTIMER_ASYNC_UNLINKS))) {
|
|
ehci_enable_event(ehci, EHCI_HRTIMER_ASYNC_UNLINKS, true);
|
|
++ehci->async_unlink_cycle;
|
|
}
|
|
}
|