![Dan Streetman](/assets/img/avatar_default.png)
This updates the EHCI driver by adding an improved scheduler for the transaction translators, found in USB 2.0 hubs and used for low and full speed devices. - adds periodic_tt_usecs() and some helper functions, which does the same thing that "periodic_usecs" does, except on the other side of the TT, i.e. it calculates the low/fullspeed bandwidth usage instead of highspeed. - adds a tt_available() function which is the new implementation of what tt_no_collision() does ... while tt_no_collision() ensures that each TT handles only 1 periodic transfer at a time (a very pessimistic approach) this version instead tracks bandwidth and allows each TT to handle as many transfers as will fit on each TT's downstream bus (closer to best-case). The new scheduler is selected by a config option, marked as EXPERIMENTAL so it can be tested (and more broadly reviewed) for a while until it seems safe to remove the original scheduler. Signed-off-by: Dan Streetman <ddstreet@ieee.org> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2231 lines
56 KiB
C
2231 lines
56 KiB
C
/*
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* Copyright (c) 2001-2004 by David Brownell
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* Copyright (c) 2003 Michal Sojka, for high-speed iso transfers
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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 scheduled transaction support: interrupt, iso, split iso
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* These are called "periodic" transactions in the EHCI spec.
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*
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* Note that for interrupt transfers, the QH/QTD manipulation is shared
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* with the "asynchronous" transaction support (control/bulk transfers).
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* The only real difference is in how interrupt transfers are scheduled.
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*
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* For ISO, we make an "iso_stream" head to serve the same role as a QH.
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* It keeps track of every ITD (or SITD) that's linked, and holds enough
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* pre-calculated schedule data to make appending to the queue be quick.
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*/
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static int ehci_get_frame (struct usb_hcd *hcd);
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/*-------------------------------------------------------------------------*/
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/*
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* periodic_next_shadow - return "next" pointer on shadow list
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* @periodic: host pointer to qh/itd/sitd
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* @tag: hardware tag for type of this record
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*/
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static union ehci_shadow *
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periodic_next_shadow (union ehci_shadow *periodic, __le32 tag)
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{
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switch (tag) {
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case Q_TYPE_QH:
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return &periodic->qh->qh_next;
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case Q_TYPE_FSTN:
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return &periodic->fstn->fstn_next;
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case Q_TYPE_ITD:
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return &periodic->itd->itd_next;
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// case Q_TYPE_SITD:
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default:
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return &periodic->sitd->sitd_next;
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}
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}
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/* caller must hold ehci->lock */
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static void periodic_unlink (struct ehci_hcd *ehci, unsigned frame, void *ptr)
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{
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union ehci_shadow *prev_p = &ehci->pshadow [frame];
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__le32 *hw_p = &ehci->periodic [frame];
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union ehci_shadow here = *prev_p;
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/* find predecessor of "ptr"; hw and shadow lists are in sync */
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while (here.ptr && here.ptr != ptr) {
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prev_p = periodic_next_shadow (prev_p, Q_NEXT_TYPE (*hw_p));
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hw_p = here.hw_next;
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here = *prev_p;
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}
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/* an interrupt entry (at list end) could have been shared */
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if (!here.ptr)
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return;
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/* update shadow and hardware lists ... the old "next" pointers
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* from ptr may still be in use, the caller updates them.
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*/
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*prev_p = *periodic_next_shadow (&here, Q_NEXT_TYPE (*hw_p));
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*hw_p = *here.hw_next;
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}
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/* how many of the uframe's 125 usecs are allocated? */
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static unsigned short
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periodic_usecs (struct ehci_hcd *ehci, unsigned frame, unsigned uframe)
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{
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__le32 *hw_p = &ehci->periodic [frame];
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union ehci_shadow *q = &ehci->pshadow [frame];
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unsigned usecs = 0;
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while (q->ptr) {
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switch (Q_NEXT_TYPE (*hw_p)) {
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case Q_TYPE_QH:
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/* is it in the S-mask? */
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if (q->qh->hw_info2 & cpu_to_le32 (1 << uframe))
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usecs += q->qh->usecs;
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/* ... or C-mask? */
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if (q->qh->hw_info2 & cpu_to_le32 (1 << (8 + uframe)))
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usecs += q->qh->c_usecs;
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hw_p = &q->qh->hw_next;
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q = &q->qh->qh_next;
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break;
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// case Q_TYPE_FSTN:
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default:
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/* for "save place" FSTNs, count the relevant INTR
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* bandwidth from the previous frame
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*/
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if (q->fstn->hw_prev != EHCI_LIST_END) {
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ehci_dbg (ehci, "ignoring FSTN cost ...\n");
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}
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hw_p = &q->fstn->hw_next;
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q = &q->fstn->fstn_next;
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break;
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case Q_TYPE_ITD:
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usecs += q->itd->usecs [uframe];
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hw_p = &q->itd->hw_next;
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q = &q->itd->itd_next;
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break;
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case Q_TYPE_SITD:
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/* is it in the S-mask? (count SPLIT, DATA) */
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if (q->sitd->hw_uframe & cpu_to_le32 (1 << uframe)) {
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if (q->sitd->hw_fullspeed_ep &
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__constant_cpu_to_le32 (1<<31))
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usecs += q->sitd->stream->usecs;
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else /* worst case for OUT start-split */
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usecs += HS_USECS_ISO (188);
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}
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/* ... C-mask? (count CSPLIT, DATA) */
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if (q->sitd->hw_uframe &
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cpu_to_le32 (1 << (8 + uframe))) {
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/* worst case for IN complete-split */
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usecs += q->sitd->stream->c_usecs;
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}
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hw_p = &q->sitd->hw_next;
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q = &q->sitd->sitd_next;
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break;
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}
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}
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#ifdef DEBUG
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if (usecs > 100)
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ehci_err (ehci, "uframe %d sched overrun: %d usecs\n",
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frame * 8 + uframe, usecs);
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#endif
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return usecs;
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}
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/*-------------------------------------------------------------------------*/
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static int same_tt (struct usb_device *dev1, struct usb_device *dev2)
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{
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if (!dev1->tt || !dev2->tt)
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return 0;
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if (dev1->tt != dev2->tt)
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return 0;
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if (dev1->tt->multi)
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return dev1->ttport == dev2->ttport;
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else
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return 1;
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}
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#ifdef CONFIG_USB_EHCI_TT_NEWSCHED
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/* Which uframe does the low/fullspeed transfer start in?
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*
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* The parameter is the mask of ssplits in "H-frame" terms
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* and this returns the transfer start uframe in "B-frame" terms,
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* which allows both to match, e.g. a ssplit in "H-frame" uframe 0
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* will cause a transfer in "B-frame" uframe 0. "B-frames" lag
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* "H-frames" by 1 uframe. See the EHCI spec sec 4.5 and figure 4.7.
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*/
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static inline unsigned char tt_start_uframe(struct ehci_hcd *ehci, __le32 mask)
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{
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unsigned char smask = QH_SMASK & le32_to_cpu(mask);
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if (!smask) {
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ehci_err(ehci, "invalid empty smask!\n");
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/* uframe 7 can't have bw so this will indicate failure */
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return 7;
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}
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return ffs(smask) - 1;
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}
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static const unsigned char
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max_tt_usecs[] = { 125, 125, 125, 125, 125, 125, 30, 0 };
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/* carryover low/fullspeed bandwidth that crosses uframe boundries */
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static inline void carryover_tt_bandwidth(unsigned short tt_usecs[8])
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{
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int i;
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for (i=0; i<7; i++) {
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if (max_tt_usecs[i] < tt_usecs[i]) {
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tt_usecs[i+1] += tt_usecs[i] - max_tt_usecs[i];
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tt_usecs[i] = max_tt_usecs[i];
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}
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}
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}
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/* How many of the tt's periodic downstream 1000 usecs are allocated?
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*
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* While this measures the bandwidth in terms of usecs/uframe,
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* the low/fullspeed bus has no notion of uframes, so any particular
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* low/fullspeed transfer can "carry over" from one uframe to the next,
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* since the TT just performs downstream transfers in sequence.
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*
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* For example two seperate 100 usec transfers can start in the same uframe,
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* and the second one would "carry over" 75 usecs into the next uframe.
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*/
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static void
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periodic_tt_usecs (
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struct ehci_hcd *ehci,
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struct usb_device *dev,
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unsigned frame,
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unsigned short tt_usecs[8]
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)
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{
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__le32 *hw_p = &ehci->periodic [frame];
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union ehci_shadow *q = &ehci->pshadow [frame];
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unsigned char uf;
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memset(tt_usecs, 0, 16);
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while (q->ptr) {
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switch (Q_NEXT_TYPE(*hw_p)) {
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case Q_TYPE_ITD:
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hw_p = &q->itd->hw_next;
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q = &q->itd->itd_next;
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continue;
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case Q_TYPE_QH:
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if (same_tt(dev, q->qh->dev)) {
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uf = tt_start_uframe(ehci, q->qh->hw_info2);
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tt_usecs[uf] += q->qh->tt_usecs;
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}
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hw_p = &q->qh->hw_next;
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q = &q->qh->qh_next;
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continue;
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case Q_TYPE_SITD:
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if (same_tt(dev, q->sitd->urb->dev)) {
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uf = tt_start_uframe(ehci, q->sitd->hw_uframe);
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tt_usecs[uf] += q->sitd->stream->tt_usecs;
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}
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hw_p = &q->sitd->hw_next;
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q = &q->sitd->sitd_next;
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continue;
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// case Q_TYPE_FSTN:
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default:
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ehci_dbg(ehci,
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"ignoring periodic frame %d FSTN\n", frame);
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hw_p = &q->fstn->hw_next;
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q = &q->fstn->fstn_next;
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}
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}
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carryover_tt_bandwidth(tt_usecs);
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if (max_tt_usecs[7] < tt_usecs[7])
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ehci_err(ehci, "frame %d tt sched overrun: %d usecs\n",
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frame, tt_usecs[7] - max_tt_usecs[7]);
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}
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/*
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* Return true if the device's tt's downstream bus is available for a
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* periodic transfer of the specified length (usecs), starting at the
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* specified frame/uframe. Note that (as summarized in section 11.19
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* of the usb 2.0 spec) TTs can buffer multiple transactions for each
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* uframe.
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*
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* The uframe parameter is when the fullspeed/lowspeed transfer
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* should be executed in "B-frame" terms, which is the same as the
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* highspeed ssplit's uframe (which is in "H-frame" terms). For example
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* a ssplit in "H-frame" 0 causes a transfer in "B-frame" 0.
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* See the EHCI spec sec 4.5 and fig 4.7.
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*
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* This checks if the full/lowspeed bus, at the specified starting uframe,
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* has the specified bandwidth available, according to rules listed
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* in USB 2.0 spec section 11.18.1 fig 11-60.
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*
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* This does not check if the transfer would exceed the max ssplit
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* limit of 16, specified in USB 2.0 spec section 11.18.4 requirement #4,
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* since proper scheduling limits ssplits to less than 16 per uframe.
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*/
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static int tt_available (
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struct ehci_hcd *ehci,
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unsigned period,
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struct usb_device *dev,
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unsigned frame,
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unsigned uframe,
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u16 usecs
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)
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{
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if ((period == 0) || (uframe >= 7)) /* error */
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return 0;
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for (; frame < ehci->periodic_size; frame += period) {
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unsigned short tt_usecs[8];
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periodic_tt_usecs (ehci, dev, frame, tt_usecs);
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ehci_vdbg(ehci, "tt frame %d check %d usecs start uframe %d in"
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" schedule %d/%d/%d/%d/%d/%d/%d/%d\n",
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frame, usecs, uframe,
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tt_usecs[0], tt_usecs[1], tt_usecs[2], tt_usecs[3],
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tt_usecs[4], tt_usecs[5], tt_usecs[6], tt_usecs[7]);
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if (max_tt_usecs[uframe] <= tt_usecs[uframe]) {
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ehci_vdbg(ehci, "frame %d uframe %d fully scheduled\n",
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frame, uframe);
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return 0;
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}
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/* special case for isoc transfers larger than 125us:
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* the first and each subsequent fully used uframe
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* must be empty, so as to not illegally delay
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* already scheduled transactions
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*/
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if (125 < usecs) {
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int ufs = (usecs / 125) - 1;
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int i;
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for (i = uframe; i < (uframe + ufs) && i < 8; i++)
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if (0 < tt_usecs[i]) {
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ehci_vdbg(ehci,
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"multi-uframe xfer can't fit "
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"in frame %d uframe %d\n",
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frame, i);
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return 0;
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}
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}
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tt_usecs[uframe] += usecs;
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carryover_tt_bandwidth(tt_usecs);
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/* fail if the carryover pushed bw past the last uframe's limit */
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if (max_tt_usecs[7] < tt_usecs[7]) {
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ehci_vdbg(ehci,
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"tt unavailable usecs %d frame %d uframe %d\n",
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usecs, frame, uframe);
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return 0;
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}
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}
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return 1;
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}
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#else
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/* return true iff the device's transaction translator is available
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* for a periodic transfer starting at the specified frame, using
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* all the uframes in the mask.
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*/
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static int tt_no_collision (
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struct ehci_hcd *ehci,
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unsigned period,
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struct usb_device *dev,
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unsigned frame,
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u32 uf_mask
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)
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{
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if (period == 0) /* error */
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return 0;
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/* note bandwidth wastage: split never follows csplit
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* (different dev or endpoint) until the next uframe.
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* calling convention doesn't make that distinction.
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*/
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for (; frame < ehci->periodic_size; frame += period) {
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union ehci_shadow here;
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__le32 type;
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here = ehci->pshadow [frame];
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type = Q_NEXT_TYPE (ehci->periodic [frame]);
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while (here.ptr) {
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switch (type) {
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case Q_TYPE_ITD:
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type = Q_NEXT_TYPE (here.itd->hw_next);
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here = here.itd->itd_next;
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continue;
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case Q_TYPE_QH:
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if (same_tt (dev, here.qh->dev)) {
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u32 mask;
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mask = le32_to_cpu (here.qh->hw_info2);
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/* "knows" no gap is needed */
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mask |= mask >> 8;
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if (mask & uf_mask)
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break;
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}
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type = Q_NEXT_TYPE (here.qh->hw_next);
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here = here.qh->qh_next;
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continue;
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case Q_TYPE_SITD:
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if (same_tt (dev, here.sitd->urb->dev)) {
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u16 mask;
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mask = le32_to_cpu (here.sitd
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->hw_uframe);
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/* FIXME assumes no gap for IN! */
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mask |= mask >> 8;
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if (mask & uf_mask)
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break;
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}
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type = Q_NEXT_TYPE (here.sitd->hw_next);
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here = here.sitd->sitd_next;
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continue;
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// case Q_TYPE_FSTN:
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default:
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ehci_dbg (ehci,
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"periodic frame %d bogus type %d\n",
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frame, type);
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}
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/* collision or error */
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return 0;
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}
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}
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/* no collision */
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return 1;
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}
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#endif /* CONFIG_USB_EHCI_TT_NEWSCHED */
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/*-------------------------------------------------------------------------*/
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static int enable_periodic (struct ehci_hcd *ehci)
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{
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u32 cmd;
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int status;
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/* did clearing PSE did take effect yet?
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* takes effect only at frame boundaries...
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*/
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status = handshake (&ehci->regs->status, STS_PSS, 0, 9 * 125);
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if (status != 0) {
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ehci_to_hcd(ehci)->state = HC_STATE_HALT;
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return status;
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}
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cmd = readl (&ehci->regs->command) | CMD_PSE;
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writel (cmd, &ehci->regs->command);
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/* posted write ... PSS happens later */
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ehci_to_hcd(ehci)->state = HC_STATE_RUNNING;
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/* make sure ehci_work scans these */
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ehci->next_uframe = readl (&ehci->regs->frame_index)
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% (ehci->periodic_size << 3);
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return 0;
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}
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static int disable_periodic (struct ehci_hcd *ehci)
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{
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u32 cmd;
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int status;
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/* did setting PSE not take effect yet?
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* takes effect only at frame boundaries...
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*/
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status = handshake (&ehci->regs->status, STS_PSS, STS_PSS, 9 * 125);
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if (status != 0) {
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ehci_to_hcd(ehci)->state = HC_STATE_HALT;
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return status;
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}
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cmd = readl (&ehci->regs->command) & ~CMD_PSE;
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writel (cmd, &ehci->regs->command);
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/* posted write ... */
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ehci->next_uframe = -1;
|
|
return 0;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* periodic schedule slots have iso tds (normal or split) first, then a
|
|
* sparse tree for active interrupt transfers.
|
|
*
|
|
* this just links in a qh; caller guarantees uframe masks are set right.
|
|
* no FSTN support (yet; ehci 0.96+)
|
|
*/
|
|
static int qh_link_periodic (struct ehci_hcd *ehci, struct ehci_qh *qh)
|
|
{
|
|
unsigned i;
|
|
unsigned period = qh->period;
|
|
|
|
dev_dbg (&qh->dev->dev,
|
|
"link qh%d-%04x/%p start %d [%d/%d us]\n",
|
|
period, le32_to_cpup (&qh->hw_info2) & (QH_CMASK | QH_SMASK),
|
|
qh, qh->start, qh->usecs, qh->c_usecs);
|
|
|
|
/* high bandwidth, or otherwise every microframe */
|
|
if (period == 0)
|
|
period = 1;
|
|
|
|
for (i = qh->start; i < ehci->periodic_size; i += period) {
|
|
union ehci_shadow *prev = &ehci->pshadow [i];
|
|
__le32 *hw_p = &ehci->periodic [i];
|
|
union ehci_shadow here = *prev;
|
|
__le32 type = 0;
|
|
|
|
/* skip the iso nodes at list head */
|
|
while (here.ptr) {
|
|
type = Q_NEXT_TYPE (*hw_p);
|
|
if (type == Q_TYPE_QH)
|
|
break;
|
|
prev = periodic_next_shadow (prev, type);
|
|
hw_p = &here.qh->hw_next;
|
|
here = *prev;
|
|
}
|
|
|
|
/* sorting each branch by period (slow-->fast)
|
|
* enables sharing interior tree nodes
|
|
*/
|
|
while (here.ptr && qh != here.qh) {
|
|
if (qh->period > here.qh->period)
|
|
break;
|
|
prev = &here.qh->qh_next;
|
|
hw_p = &here.qh->hw_next;
|
|
here = *prev;
|
|
}
|
|
/* link in this qh, unless some earlier pass did that */
|
|
if (qh != here.qh) {
|
|
qh->qh_next = here;
|
|
if (here.qh)
|
|
qh->hw_next = *hw_p;
|
|
wmb ();
|
|
prev->qh = qh;
|
|
*hw_p = QH_NEXT (qh->qh_dma);
|
|
}
|
|
}
|
|
qh->qh_state = QH_STATE_LINKED;
|
|
qh_get (qh);
|
|
|
|
/* update per-qh bandwidth for usbfs */
|
|
ehci_to_hcd(ehci)->self.bandwidth_allocated += qh->period
|
|
? ((qh->usecs + qh->c_usecs) / qh->period)
|
|
: (qh->usecs * 8);
|
|
|
|
/* maybe enable periodic schedule processing */
|
|
if (!ehci->periodic_sched++)
|
|
return enable_periodic (ehci);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void qh_unlink_periodic (struct ehci_hcd *ehci, struct ehci_qh *qh)
|
|
{
|
|
unsigned i;
|
|
unsigned period;
|
|
|
|
// FIXME:
|
|
// IF this isn't high speed
|
|
// and this qh is active in the current uframe
|
|
// (and overlay token SplitXstate is false?)
|
|
// THEN
|
|
// qh->hw_info1 |= __constant_cpu_to_le32 (1 << 7 /* "ignore" */);
|
|
|
|
/* high bandwidth, or otherwise part of every microframe */
|
|
if ((period = qh->period) == 0)
|
|
period = 1;
|
|
|
|
for (i = qh->start; i < ehci->periodic_size; i += period)
|
|
periodic_unlink (ehci, i, qh);
|
|
|
|
/* update per-qh bandwidth for usbfs */
|
|
ehci_to_hcd(ehci)->self.bandwidth_allocated -= qh->period
|
|
? ((qh->usecs + qh->c_usecs) / qh->period)
|
|
: (qh->usecs * 8);
|
|
|
|
dev_dbg (&qh->dev->dev,
|
|
"unlink qh%d-%04x/%p start %d [%d/%d us]\n",
|
|
qh->period,
|
|
le32_to_cpup (&qh->hw_info2) & (QH_CMASK | QH_SMASK),
|
|
qh, qh->start, qh->usecs, qh->c_usecs);
|
|
|
|
/* qh->qh_next still "live" to HC */
|
|
qh->qh_state = QH_STATE_UNLINK;
|
|
qh->qh_next.ptr = NULL;
|
|
qh_put (qh);
|
|
|
|
/* maybe turn off periodic schedule */
|
|
ehci->periodic_sched--;
|
|
if (!ehci->periodic_sched)
|
|
(void) disable_periodic (ehci);
|
|
}
|
|
|
|
static void intr_deschedule (struct ehci_hcd *ehci, struct ehci_qh *qh)
|
|
{
|
|
unsigned wait;
|
|
|
|
qh_unlink_periodic (ehci, qh);
|
|
|
|
/* simple/paranoid: always delay, expecting the HC needs to read
|
|
* qh->hw_next or finish a writeback after SPLIT/CSPLIT ... and
|
|
* expect khubd to clean up after any CSPLITs we won't issue.
|
|
* active high speed queues may need bigger delays...
|
|
*/
|
|
if (list_empty (&qh->qtd_list)
|
|
|| (__constant_cpu_to_le32 (QH_CMASK)
|
|
& qh->hw_info2) != 0)
|
|
wait = 2;
|
|
else
|
|
wait = 55; /* worst case: 3 * 1024 */
|
|
|
|
udelay (wait);
|
|
qh->qh_state = QH_STATE_IDLE;
|
|
qh->hw_next = EHCI_LIST_END;
|
|
wmb ();
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static int check_period (
|
|
struct ehci_hcd *ehci,
|
|
unsigned frame,
|
|
unsigned uframe,
|
|
unsigned period,
|
|
unsigned usecs
|
|
) {
|
|
int claimed;
|
|
|
|
/* complete split running into next frame?
|
|
* given FSTN support, we could sometimes check...
|
|
*/
|
|
if (uframe >= 8)
|
|
return 0;
|
|
|
|
/*
|
|
* 80% periodic == 100 usec/uframe available
|
|
* convert "usecs we need" to "max already claimed"
|
|
*/
|
|
usecs = 100 - usecs;
|
|
|
|
/* we "know" 2 and 4 uframe intervals were rejected; so
|
|
* for period 0, check _every_ microframe in the schedule.
|
|
*/
|
|
if (unlikely (period == 0)) {
|
|
do {
|
|
for (uframe = 0; uframe < 7; uframe++) {
|
|
claimed = periodic_usecs (ehci, frame, uframe);
|
|
if (claimed > usecs)
|
|
return 0;
|
|
}
|
|
} while ((frame += 1) < ehci->periodic_size);
|
|
|
|
/* just check the specified uframe, at that period */
|
|
} else {
|
|
do {
|
|
claimed = periodic_usecs (ehci, frame, uframe);
|
|
if (claimed > usecs)
|
|
return 0;
|
|
} while ((frame += period) < ehci->periodic_size);
|
|
}
|
|
|
|
// success!
|
|
return 1;
|
|
}
|
|
|
|
static int check_intr_schedule (
|
|
struct ehci_hcd *ehci,
|
|
unsigned frame,
|
|
unsigned uframe,
|
|
const struct ehci_qh *qh,
|
|
__le32 *c_maskp
|
|
)
|
|
{
|
|
int retval = -ENOSPC;
|
|
u8 mask = 0;
|
|
|
|
if (qh->c_usecs && uframe >= 6) /* FSTN territory? */
|
|
goto done;
|
|
|
|
if (!check_period (ehci, frame, uframe, qh->period, qh->usecs))
|
|
goto done;
|
|
if (!qh->c_usecs) {
|
|
retval = 0;
|
|
*c_maskp = 0;
|
|
goto done;
|
|
}
|
|
|
|
#ifdef CONFIG_USB_EHCI_TT_NEWSCHED
|
|
if (tt_available (ehci, qh->period, qh->dev, frame, uframe,
|
|
qh->tt_usecs)) {
|
|
unsigned i;
|
|
|
|
/* TODO : this may need FSTN for SSPLIT in uframe 5. */
|
|
for (i=uframe+1; i<8 && i<uframe+4; i++)
|
|
if (!check_period (ehci, frame, i,
|
|
qh->period, qh->c_usecs))
|
|
goto done;
|
|
else
|
|
mask |= 1 << i;
|
|
|
|
retval = 0;
|
|
|
|
*c_maskp = cpu_to_le32 (mask << 8);
|
|
}
|
|
#else
|
|
/* Make sure this tt's buffer is also available for CSPLITs.
|
|
* We pessimize a bit; probably the typical full speed case
|
|
* doesn't need the second CSPLIT.
|
|
*
|
|
* NOTE: both SPLIT and CSPLIT could be checked in just
|
|
* one smart pass...
|
|
*/
|
|
mask = 0x03 << (uframe + qh->gap_uf);
|
|
*c_maskp = cpu_to_le32 (mask << 8);
|
|
|
|
mask |= 1 << uframe;
|
|
if (tt_no_collision (ehci, qh->period, qh->dev, frame, mask)) {
|
|
if (!check_period (ehci, frame, uframe + qh->gap_uf + 1,
|
|
qh->period, qh->c_usecs))
|
|
goto done;
|
|
if (!check_period (ehci, frame, uframe + qh->gap_uf,
|
|
qh->period, qh->c_usecs))
|
|
goto done;
|
|
retval = 0;
|
|
}
|
|
#endif
|
|
done:
|
|
return retval;
|
|
}
|
|
|
|
/* "first fit" scheduling policy used the first time through,
|
|
* or when the previous schedule slot can't be re-used.
|
|
*/
|
|
static int qh_schedule (struct ehci_hcd *ehci, struct ehci_qh *qh)
|
|
{
|
|
int status;
|
|
unsigned uframe;
|
|
__le32 c_mask;
|
|
unsigned frame; /* 0..(qh->period - 1), or NO_FRAME */
|
|
|
|
qh_refresh(ehci, qh);
|
|
qh->hw_next = EHCI_LIST_END;
|
|
frame = qh->start;
|
|
|
|
/* reuse the previous schedule slots, if we can */
|
|
if (frame < qh->period) {
|
|
uframe = ffs (le32_to_cpup (&qh->hw_info2) & QH_SMASK);
|
|
status = check_intr_schedule (ehci, frame, --uframe,
|
|
qh, &c_mask);
|
|
} else {
|
|
uframe = 0;
|
|
c_mask = 0;
|
|
status = -ENOSPC;
|
|
}
|
|
|
|
/* else scan the schedule to find a group of slots such that all
|
|
* uframes have enough periodic bandwidth available.
|
|
*/
|
|
if (status) {
|
|
/* "normal" case, uframing flexible except with splits */
|
|
if (qh->period) {
|
|
frame = qh->period - 1;
|
|
do {
|
|
for (uframe = 0; uframe < 8; uframe++) {
|
|
status = check_intr_schedule (ehci,
|
|
frame, uframe, qh,
|
|
&c_mask);
|
|
if (status == 0)
|
|
break;
|
|
}
|
|
} while (status && frame--);
|
|
|
|
/* qh->period == 0 means every uframe */
|
|
} else {
|
|
frame = 0;
|
|
status = check_intr_schedule (ehci, 0, 0, qh, &c_mask);
|
|
}
|
|
if (status)
|
|
goto done;
|
|
qh->start = frame;
|
|
|
|
/* reset S-frame and (maybe) C-frame masks */
|
|
qh->hw_info2 &= __constant_cpu_to_le32(~(QH_CMASK | QH_SMASK));
|
|
qh->hw_info2 |= qh->period
|
|
? cpu_to_le32 (1 << uframe)
|
|
: __constant_cpu_to_le32 (QH_SMASK);
|
|
qh->hw_info2 |= c_mask;
|
|
} else
|
|
ehci_dbg (ehci, "reused qh %p schedule\n", qh);
|
|
|
|
/* stuff into the periodic schedule */
|
|
status = qh_link_periodic (ehci, qh);
|
|
done:
|
|
return status;
|
|
}
|
|
|
|
static int intr_submit (
|
|
struct ehci_hcd *ehci,
|
|
struct usb_host_endpoint *ep,
|
|
struct urb *urb,
|
|
struct list_head *qtd_list,
|
|
gfp_t mem_flags
|
|
) {
|
|
unsigned epnum;
|
|
unsigned long flags;
|
|
struct ehci_qh *qh;
|
|
int status = 0;
|
|
struct list_head empty;
|
|
|
|
/* get endpoint and transfer/schedule data */
|
|
epnum = ep->desc.bEndpointAddress;
|
|
|
|
spin_lock_irqsave (&ehci->lock, flags);
|
|
|
|
if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE,
|
|
&ehci_to_hcd(ehci)->flags))) {
|
|
status = -ESHUTDOWN;
|
|
goto done;
|
|
}
|
|
|
|
/* get qh and force any scheduling errors */
|
|
INIT_LIST_HEAD (&empty);
|
|
qh = qh_append_tds (ehci, urb, &empty, epnum, &ep->hcpriv);
|
|
if (qh == NULL) {
|
|
status = -ENOMEM;
|
|
goto done;
|
|
}
|
|
if (qh->qh_state == QH_STATE_IDLE) {
|
|
if ((status = qh_schedule (ehci, qh)) != 0)
|
|
goto done;
|
|
}
|
|
|
|
/* then queue the urb's tds to the qh */
|
|
qh = qh_append_tds (ehci, urb, qtd_list, epnum, &ep->hcpriv);
|
|
BUG_ON (qh == NULL);
|
|
|
|
/* ... update usbfs periodic stats */
|
|
ehci_to_hcd(ehci)->self.bandwidth_int_reqs++;
|
|
|
|
done:
|
|
spin_unlock_irqrestore (&ehci->lock, flags);
|
|
if (status)
|
|
qtd_list_free (ehci, urb, qtd_list);
|
|
|
|
return status;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* ehci_iso_stream ops work with both ITD and SITD */
|
|
|
|
static struct ehci_iso_stream *
|
|
iso_stream_alloc (gfp_t mem_flags)
|
|
{
|
|
struct ehci_iso_stream *stream;
|
|
|
|
stream = kzalloc(sizeof *stream, mem_flags);
|
|
if (likely (stream != NULL)) {
|
|
INIT_LIST_HEAD(&stream->td_list);
|
|
INIT_LIST_HEAD(&stream->free_list);
|
|
stream->next_uframe = -1;
|
|
stream->refcount = 1;
|
|
}
|
|
return stream;
|
|
}
|
|
|
|
static void
|
|
iso_stream_init (
|
|
struct ehci_hcd *ehci,
|
|
struct ehci_iso_stream *stream,
|
|
struct usb_device *dev,
|
|
int pipe,
|
|
unsigned interval
|
|
)
|
|
{
|
|
static const u8 smask_out [] = { 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f };
|
|
|
|
u32 buf1;
|
|
unsigned epnum, maxp;
|
|
int is_input;
|
|
long bandwidth;
|
|
|
|
/*
|
|
* this might be a "high bandwidth" highspeed endpoint,
|
|
* as encoded in the ep descriptor's wMaxPacket field
|
|
*/
|
|
epnum = usb_pipeendpoint (pipe);
|
|
is_input = usb_pipein (pipe) ? USB_DIR_IN : 0;
|
|
maxp = usb_maxpacket(dev, pipe, !is_input);
|
|
if (is_input) {
|
|
buf1 = (1 << 11);
|
|
} else {
|
|
buf1 = 0;
|
|
}
|
|
|
|
/* knows about ITD vs SITD */
|
|
if (dev->speed == USB_SPEED_HIGH) {
|
|
unsigned multi = hb_mult(maxp);
|
|
|
|
stream->highspeed = 1;
|
|
|
|
maxp = max_packet(maxp);
|
|
buf1 |= maxp;
|
|
maxp *= multi;
|
|
|
|
stream->buf0 = cpu_to_le32 ((epnum << 8) | dev->devnum);
|
|
stream->buf1 = cpu_to_le32 (buf1);
|
|
stream->buf2 = cpu_to_le32 (multi);
|
|
|
|
/* usbfs wants to report the average usecs per frame tied up
|
|
* when transfers on this endpoint are scheduled ...
|
|
*/
|
|
stream->usecs = HS_USECS_ISO (maxp);
|
|
bandwidth = stream->usecs * 8;
|
|
bandwidth /= 1 << (interval - 1);
|
|
|
|
} else {
|
|
u32 addr;
|
|
int think_time;
|
|
int hs_transfers;
|
|
|
|
addr = dev->ttport << 24;
|
|
if (!ehci_is_TDI(ehci)
|
|
|| (dev->tt->hub !=
|
|
ehci_to_hcd(ehci)->self.root_hub))
|
|
addr |= dev->tt->hub->devnum << 16;
|
|
addr |= epnum << 8;
|
|
addr |= dev->devnum;
|
|
stream->usecs = HS_USECS_ISO (maxp);
|
|
think_time = dev->tt ? dev->tt->think_time : 0;
|
|
stream->tt_usecs = NS_TO_US (think_time + usb_calc_bus_time (
|
|
dev->speed, is_input, 1, maxp));
|
|
hs_transfers = max (1u, (maxp + 187) / 188);
|
|
if (is_input) {
|
|
u32 tmp;
|
|
|
|
addr |= 1 << 31;
|
|
stream->c_usecs = stream->usecs;
|
|
stream->usecs = HS_USECS_ISO (1);
|
|
stream->raw_mask = 1;
|
|
|
|
/* c-mask as specified in USB 2.0 11.18.4 3.c */
|
|
tmp = (1 << (hs_transfers + 2)) - 1;
|
|
stream->raw_mask |= tmp << (8 + 2);
|
|
} else
|
|
stream->raw_mask = smask_out [hs_transfers - 1];
|
|
bandwidth = stream->usecs + stream->c_usecs;
|
|
bandwidth /= 1 << (interval + 2);
|
|
|
|
/* stream->splits gets created from raw_mask later */
|
|
stream->address = cpu_to_le32 (addr);
|
|
}
|
|
stream->bandwidth = bandwidth;
|
|
|
|
stream->udev = dev;
|
|
|
|
stream->bEndpointAddress = is_input | epnum;
|
|
stream->interval = interval;
|
|
stream->maxp = maxp;
|
|
}
|
|
|
|
static void
|
|
iso_stream_put(struct ehci_hcd *ehci, struct ehci_iso_stream *stream)
|
|
{
|
|
stream->refcount--;
|
|
|
|
/* free whenever just a dev->ep reference remains.
|
|
* not like a QH -- no persistent state (toggle, halt)
|
|
*/
|
|
if (stream->refcount == 1) {
|
|
int is_in;
|
|
|
|
// BUG_ON (!list_empty(&stream->td_list));
|
|
|
|
while (!list_empty (&stream->free_list)) {
|
|
struct list_head *entry;
|
|
|
|
entry = stream->free_list.next;
|
|
list_del (entry);
|
|
|
|
/* knows about ITD vs SITD */
|
|
if (stream->highspeed) {
|
|
struct ehci_itd *itd;
|
|
|
|
itd = list_entry (entry, struct ehci_itd,
|
|
itd_list);
|
|
dma_pool_free (ehci->itd_pool, itd,
|
|
itd->itd_dma);
|
|
} else {
|
|
struct ehci_sitd *sitd;
|
|
|
|
sitd = list_entry (entry, struct ehci_sitd,
|
|
sitd_list);
|
|
dma_pool_free (ehci->sitd_pool, sitd,
|
|
sitd->sitd_dma);
|
|
}
|
|
}
|
|
|
|
is_in = (stream->bEndpointAddress & USB_DIR_IN) ? 0x10 : 0;
|
|
stream->bEndpointAddress &= 0x0f;
|
|
stream->ep->hcpriv = NULL;
|
|
|
|
if (stream->rescheduled) {
|
|
ehci_info (ehci, "ep%d%s-iso rescheduled "
|
|
"%lu times in %lu seconds\n",
|
|
stream->bEndpointAddress, is_in ? "in" : "out",
|
|
stream->rescheduled,
|
|
((jiffies - stream->start)/HZ)
|
|
);
|
|
}
|
|
|
|
kfree(stream);
|
|
}
|
|
}
|
|
|
|
static inline struct ehci_iso_stream *
|
|
iso_stream_get (struct ehci_iso_stream *stream)
|
|
{
|
|
if (likely (stream != NULL))
|
|
stream->refcount++;
|
|
return stream;
|
|
}
|
|
|
|
static struct ehci_iso_stream *
|
|
iso_stream_find (struct ehci_hcd *ehci, struct urb *urb)
|
|
{
|
|
unsigned epnum;
|
|
struct ehci_iso_stream *stream;
|
|
struct usb_host_endpoint *ep;
|
|
unsigned long flags;
|
|
|
|
epnum = usb_pipeendpoint (urb->pipe);
|
|
if (usb_pipein(urb->pipe))
|
|
ep = urb->dev->ep_in[epnum];
|
|
else
|
|
ep = urb->dev->ep_out[epnum];
|
|
|
|
spin_lock_irqsave (&ehci->lock, flags);
|
|
stream = ep->hcpriv;
|
|
|
|
if (unlikely (stream == NULL)) {
|
|
stream = iso_stream_alloc(GFP_ATOMIC);
|
|
if (likely (stream != NULL)) {
|
|
/* dev->ep owns the initial refcount */
|
|
ep->hcpriv = stream;
|
|
stream->ep = ep;
|
|
iso_stream_init(ehci, stream, urb->dev, urb->pipe,
|
|
urb->interval);
|
|
}
|
|
|
|
/* if dev->ep [epnum] is a QH, info1.maxpacket is nonzero */
|
|
} else if (unlikely (stream->hw_info1 != 0)) {
|
|
ehci_dbg (ehci, "dev %s ep%d%s, not iso??\n",
|
|
urb->dev->devpath, epnum,
|
|
usb_pipein(urb->pipe) ? "in" : "out");
|
|
stream = NULL;
|
|
}
|
|
|
|
/* caller guarantees an eventual matching iso_stream_put */
|
|
stream = iso_stream_get (stream);
|
|
|
|
spin_unlock_irqrestore (&ehci->lock, flags);
|
|
return stream;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* ehci_iso_sched ops can be ITD-only or SITD-only */
|
|
|
|
static struct ehci_iso_sched *
|
|
iso_sched_alloc (unsigned packets, gfp_t mem_flags)
|
|
{
|
|
struct ehci_iso_sched *iso_sched;
|
|
int size = sizeof *iso_sched;
|
|
|
|
size += packets * sizeof (struct ehci_iso_packet);
|
|
iso_sched = kzalloc(size, mem_flags);
|
|
if (likely (iso_sched != NULL)) {
|
|
INIT_LIST_HEAD (&iso_sched->td_list);
|
|
}
|
|
return iso_sched;
|
|
}
|
|
|
|
static inline void
|
|
itd_sched_init (
|
|
struct ehci_iso_sched *iso_sched,
|
|
struct ehci_iso_stream *stream,
|
|
struct urb *urb
|
|
)
|
|
{
|
|
unsigned i;
|
|
dma_addr_t dma = urb->transfer_dma;
|
|
|
|
/* how many uframes are needed for these transfers */
|
|
iso_sched->span = urb->number_of_packets * stream->interval;
|
|
|
|
/* figure out per-uframe itd fields that we'll need later
|
|
* when we fit new itds into the schedule.
|
|
*/
|
|
for (i = 0; i < urb->number_of_packets; i++) {
|
|
struct ehci_iso_packet *uframe = &iso_sched->packet [i];
|
|
unsigned length;
|
|
dma_addr_t buf;
|
|
u32 trans;
|
|
|
|
length = urb->iso_frame_desc [i].length;
|
|
buf = dma + urb->iso_frame_desc [i].offset;
|
|
|
|
trans = EHCI_ISOC_ACTIVE;
|
|
trans |= buf & 0x0fff;
|
|
if (unlikely (((i + 1) == urb->number_of_packets))
|
|
&& !(urb->transfer_flags & URB_NO_INTERRUPT))
|
|
trans |= EHCI_ITD_IOC;
|
|
trans |= length << 16;
|
|
uframe->transaction = cpu_to_le32 (trans);
|
|
|
|
/* might need to cross a buffer page within a uframe */
|
|
uframe->bufp = (buf & ~(u64)0x0fff);
|
|
buf += length;
|
|
if (unlikely ((uframe->bufp != (buf & ~(u64)0x0fff))))
|
|
uframe->cross = 1;
|
|
}
|
|
}
|
|
|
|
static void
|
|
iso_sched_free (
|
|
struct ehci_iso_stream *stream,
|
|
struct ehci_iso_sched *iso_sched
|
|
)
|
|
{
|
|
if (!iso_sched)
|
|
return;
|
|
// caller must hold ehci->lock!
|
|
list_splice (&iso_sched->td_list, &stream->free_list);
|
|
kfree (iso_sched);
|
|
}
|
|
|
|
static int
|
|
itd_urb_transaction (
|
|
struct ehci_iso_stream *stream,
|
|
struct ehci_hcd *ehci,
|
|
struct urb *urb,
|
|
gfp_t mem_flags
|
|
)
|
|
{
|
|
struct ehci_itd *itd;
|
|
dma_addr_t itd_dma;
|
|
int i;
|
|
unsigned num_itds;
|
|
struct ehci_iso_sched *sched;
|
|
unsigned long flags;
|
|
|
|
sched = iso_sched_alloc (urb->number_of_packets, mem_flags);
|
|
if (unlikely (sched == NULL))
|
|
return -ENOMEM;
|
|
|
|
itd_sched_init (sched, stream, urb);
|
|
|
|
if (urb->interval < 8)
|
|
num_itds = 1 + (sched->span + 7) / 8;
|
|
else
|
|
num_itds = urb->number_of_packets;
|
|
|
|
/* allocate/init ITDs */
|
|
spin_lock_irqsave (&ehci->lock, flags);
|
|
for (i = 0; i < num_itds; i++) {
|
|
|
|
/* free_list.next might be cache-hot ... but maybe
|
|
* the HC caches it too. avoid that issue for now.
|
|
*/
|
|
|
|
/* prefer previously-allocated itds */
|
|
if (likely (!list_empty(&stream->free_list))) {
|
|
itd = list_entry (stream->free_list.prev,
|
|
struct ehci_itd, itd_list);
|
|
list_del (&itd->itd_list);
|
|
itd_dma = itd->itd_dma;
|
|
} else
|
|
itd = NULL;
|
|
|
|
if (!itd) {
|
|
spin_unlock_irqrestore (&ehci->lock, flags);
|
|
itd = dma_pool_alloc (ehci->itd_pool, mem_flags,
|
|
&itd_dma);
|
|
spin_lock_irqsave (&ehci->lock, flags);
|
|
}
|
|
|
|
if (unlikely (NULL == itd)) {
|
|
iso_sched_free (stream, sched);
|
|
spin_unlock_irqrestore (&ehci->lock, flags);
|
|
return -ENOMEM;
|
|
}
|
|
memset (itd, 0, sizeof *itd);
|
|
itd->itd_dma = itd_dma;
|
|
list_add (&itd->itd_list, &sched->td_list);
|
|
}
|
|
spin_unlock_irqrestore (&ehci->lock, flags);
|
|
|
|
/* temporarily store schedule info in hcpriv */
|
|
urb->hcpriv = sched;
|
|
urb->error_count = 0;
|
|
return 0;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static inline int
|
|
itd_slot_ok (
|
|
struct ehci_hcd *ehci,
|
|
u32 mod,
|
|
u32 uframe,
|
|
u8 usecs,
|
|
u32 period
|
|
)
|
|
{
|
|
uframe %= period;
|
|
do {
|
|
/* can't commit more than 80% periodic == 100 usec */
|
|
if (periodic_usecs (ehci, uframe >> 3, uframe & 0x7)
|
|
> (100 - usecs))
|
|
return 0;
|
|
|
|
/* we know urb->interval is 2^N uframes */
|
|
uframe += period;
|
|
} while (uframe < mod);
|
|
return 1;
|
|
}
|
|
|
|
static inline int
|
|
sitd_slot_ok (
|
|
struct ehci_hcd *ehci,
|
|
u32 mod,
|
|
struct ehci_iso_stream *stream,
|
|
u32 uframe,
|
|
struct ehci_iso_sched *sched,
|
|
u32 period_uframes
|
|
)
|
|
{
|
|
u32 mask, tmp;
|
|
u32 frame, uf;
|
|
|
|
mask = stream->raw_mask << (uframe & 7);
|
|
|
|
/* for IN, don't wrap CSPLIT into the next frame */
|
|
if (mask & ~0xffff)
|
|
return 0;
|
|
|
|
/* this multi-pass logic is simple, but performance may
|
|
* suffer when the schedule data isn't cached.
|
|
*/
|
|
|
|
/* check bandwidth */
|
|
uframe %= period_uframes;
|
|
do {
|
|
u32 max_used;
|
|
|
|
frame = uframe >> 3;
|
|
uf = uframe & 7;
|
|
|
|
#ifdef CONFIG_USB_EHCI_TT_NEWSCHED
|
|
/* The tt's fullspeed bus bandwidth must be available.
|
|
* tt_available scheduling guarantees 10+% for control/bulk.
|
|
*/
|
|
if (!tt_available (ehci, period_uframes << 3,
|
|
stream->udev, frame, uf, stream->tt_usecs))
|
|
return 0;
|
|
#else
|
|
/* tt must be idle for start(s), any gap, and csplit.
|
|
* assume scheduling slop leaves 10+% for control/bulk.
|
|
*/
|
|
if (!tt_no_collision (ehci, period_uframes << 3,
|
|
stream->udev, frame, mask))
|
|
return 0;
|
|
#endif
|
|
|
|
/* check starts (OUT uses more than one) */
|
|
max_used = 100 - stream->usecs;
|
|
for (tmp = stream->raw_mask & 0xff; tmp; tmp >>= 1, uf++) {
|
|
if (periodic_usecs (ehci, frame, uf) > max_used)
|
|
return 0;
|
|
}
|
|
|
|
/* for IN, check CSPLIT */
|
|
if (stream->c_usecs) {
|
|
uf = uframe & 7;
|
|
max_used = 100 - stream->c_usecs;
|
|
do {
|
|
tmp = 1 << uf;
|
|
tmp <<= 8;
|
|
if ((stream->raw_mask & tmp) == 0)
|
|
continue;
|
|
if (periodic_usecs (ehci, frame, uf)
|
|
> max_used)
|
|
return 0;
|
|
} while (++uf < 8);
|
|
}
|
|
|
|
/* we know urb->interval is 2^N uframes */
|
|
uframe += period_uframes;
|
|
} while (uframe < mod);
|
|
|
|
stream->splits = cpu_to_le32(stream->raw_mask << (uframe & 7));
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* This scheduler plans almost as far into the future as it has actual
|
|
* periodic schedule slots. (Affected by TUNE_FLS, which defaults to
|
|
* "as small as possible" to be cache-friendlier.) That limits the size
|
|
* transfers you can stream reliably; avoid more than 64 msec per urb.
|
|
* Also avoid queue depths of less than ehci's worst irq latency (affected
|
|
* by the per-urb URB_NO_INTERRUPT hint, the log2_irq_thresh module parameter,
|
|
* and other factors); or more than about 230 msec total (for portability,
|
|
* given EHCI_TUNE_FLS and the slop). Or, write a smarter scheduler!
|
|
*/
|
|
|
|
#define SCHEDULE_SLOP 10 /* frames */
|
|
|
|
static int
|
|
iso_stream_schedule (
|
|
struct ehci_hcd *ehci,
|
|
struct urb *urb,
|
|
struct ehci_iso_stream *stream
|
|
)
|
|
{
|
|
u32 now, start, max, period;
|
|
int status;
|
|
unsigned mod = ehci->periodic_size << 3;
|
|
struct ehci_iso_sched *sched = urb->hcpriv;
|
|
|
|
if (sched->span > (mod - 8 * SCHEDULE_SLOP)) {
|
|
ehci_dbg (ehci, "iso request %p too long\n", urb);
|
|
status = -EFBIG;
|
|
goto fail;
|
|
}
|
|
|
|
if ((stream->depth + sched->span) > mod) {
|
|
ehci_dbg (ehci, "request %p would overflow (%d+%d>%d)\n",
|
|
urb, stream->depth, sched->span, mod);
|
|
status = -EFBIG;
|
|
goto fail;
|
|
}
|
|
|
|
now = readl (&ehci->regs->frame_index) % mod;
|
|
|
|
/* when's the last uframe this urb could start? */
|
|
max = now + mod;
|
|
|
|
/* typical case: reuse current schedule. stream is still active,
|
|
* and no gaps from host falling behind (irq delays etc)
|
|
*/
|
|
if (likely (!list_empty (&stream->td_list))) {
|
|
start = stream->next_uframe;
|
|
if (start < now)
|
|
start += mod;
|
|
if (likely ((start + sched->span) < max))
|
|
goto ready;
|
|
/* else fell behind; someday, try to reschedule */
|
|
status = -EL2NSYNC;
|
|
goto fail;
|
|
}
|
|
|
|
/* need to schedule; when's the next (u)frame we could start?
|
|
* this is bigger than ehci->i_thresh allows; scheduling itself
|
|
* isn't free, the slop should handle reasonably slow cpus. it
|
|
* can also help high bandwidth if the dma and irq loads don't
|
|
* jump until after the queue is primed.
|
|
*/
|
|
start = SCHEDULE_SLOP * 8 + (now & ~0x07);
|
|
start %= mod;
|
|
stream->next_uframe = start;
|
|
|
|
/* NOTE: assumes URB_ISO_ASAP, to limit complexity/bugs */
|
|
|
|
period = urb->interval;
|
|
if (!stream->highspeed)
|
|
period <<= 3;
|
|
|
|
/* find a uframe slot with enough bandwidth */
|
|
for (; start < (stream->next_uframe + period); start++) {
|
|
int enough_space;
|
|
|
|
/* check schedule: enough space? */
|
|
if (stream->highspeed)
|
|
enough_space = itd_slot_ok (ehci, mod, start,
|
|
stream->usecs, period);
|
|
else {
|
|
if ((start % 8) >= 6)
|
|
continue;
|
|
enough_space = sitd_slot_ok (ehci, mod, stream,
|
|
start, sched, period);
|
|
}
|
|
|
|
/* schedule it here if there's enough bandwidth */
|
|
if (enough_space) {
|
|
stream->next_uframe = start % mod;
|
|
goto ready;
|
|
}
|
|
}
|
|
|
|
/* no room in the schedule */
|
|
ehci_dbg (ehci, "iso %ssched full %p (now %d max %d)\n",
|
|
list_empty (&stream->td_list) ? "" : "re",
|
|
urb, now, max);
|
|
status = -ENOSPC;
|
|
|
|
fail:
|
|
iso_sched_free (stream, sched);
|
|
urb->hcpriv = NULL;
|
|
return status;
|
|
|
|
ready:
|
|
/* report high speed start in uframes; full speed, in frames */
|
|
urb->start_frame = stream->next_uframe;
|
|
if (!stream->highspeed)
|
|
urb->start_frame >>= 3;
|
|
return 0;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static inline void
|
|
itd_init (struct ehci_iso_stream *stream, struct ehci_itd *itd)
|
|
{
|
|
int i;
|
|
|
|
/* it's been recently zeroed */
|
|
itd->hw_next = EHCI_LIST_END;
|
|
itd->hw_bufp [0] = stream->buf0;
|
|
itd->hw_bufp [1] = stream->buf1;
|
|
itd->hw_bufp [2] = stream->buf2;
|
|
|
|
for (i = 0; i < 8; i++)
|
|
itd->index[i] = -1;
|
|
|
|
/* All other fields are filled when scheduling */
|
|
}
|
|
|
|
static inline void
|
|
itd_patch (
|
|
struct ehci_itd *itd,
|
|
struct ehci_iso_sched *iso_sched,
|
|
unsigned index,
|
|
u16 uframe
|
|
)
|
|
{
|
|
struct ehci_iso_packet *uf = &iso_sched->packet [index];
|
|
unsigned pg = itd->pg;
|
|
|
|
// BUG_ON (pg == 6 && uf->cross);
|
|
|
|
uframe &= 0x07;
|
|
itd->index [uframe] = index;
|
|
|
|
itd->hw_transaction [uframe] = uf->transaction;
|
|
itd->hw_transaction [uframe] |= cpu_to_le32 (pg << 12);
|
|
itd->hw_bufp [pg] |= cpu_to_le32 (uf->bufp & ~(u32)0);
|
|
itd->hw_bufp_hi [pg] |= cpu_to_le32 ((u32)(uf->bufp >> 32));
|
|
|
|
/* iso_frame_desc[].offset must be strictly increasing */
|
|
if (unlikely (uf->cross)) {
|
|
u64 bufp = uf->bufp + 4096;
|
|
itd->pg = ++pg;
|
|
itd->hw_bufp [pg] |= cpu_to_le32 (bufp & ~(u32)0);
|
|
itd->hw_bufp_hi [pg] |= cpu_to_le32 ((u32)(bufp >> 32));
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
itd_link (struct ehci_hcd *ehci, unsigned frame, struct ehci_itd *itd)
|
|
{
|
|
/* always prepend ITD/SITD ... only QH tree is order-sensitive */
|
|
itd->itd_next = ehci->pshadow [frame];
|
|
itd->hw_next = ehci->periodic [frame];
|
|
ehci->pshadow [frame].itd = itd;
|
|
itd->frame = frame;
|
|
wmb ();
|
|
ehci->periodic [frame] = cpu_to_le32 (itd->itd_dma) | Q_TYPE_ITD;
|
|
}
|
|
|
|
/* fit urb's itds into the selected schedule slot; activate as needed */
|
|
static int
|
|
itd_link_urb (
|
|
struct ehci_hcd *ehci,
|
|
struct urb *urb,
|
|
unsigned mod,
|
|
struct ehci_iso_stream *stream
|
|
)
|
|
{
|
|
int packet;
|
|
unsigned next_uframe, uframe, frame;
|
|
struct ehci_iso_sched *iso_sched = urb->hcpriv;
|
|
struct ehci_itd *itd;
|
|
|
|
next_uframe = stream->next_uframe % mod;
|
|
|
|
if (unlikely (list_empty(&stream->td_list))) {
|
|
ehci_to_hcd(ehci)->self.bandwidth_allocated
|
|
+= stream->bandwidth;
|
|
ehci_vdbg (ehci,
|
|
"schedule devp %s ep%d%s-iso period %d start %d.%d\n",
|
|
urb->dev->devpath, stream->bEndpointAddress & 0x0f,
|
|
(stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
|
|
urb->interval,
|
|
next_uframe >> 3, next_uframe & 0x7);
|
|
stream->start = jiffies;
|
|
}
|
|
ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs++;
|
|
|
|
/* fill iTDs uframe by uframe */
|
|
for (packet = 0, itd = NULL; packet < urb->number_of_packets; ) {
|
|
if (itd == NULL) {
|
|
/* ASSERT: we have all necessary itds */
|
|
// BUG_ON (list_empty (&iso_sched->td_list));
|
|
|
|
/* ASSERT: no itds for this endpoint in this uframe */
|
|
|
|
itd = list_entry (iso_sched->td_list.next,
|
|
struct ehci_itd, itd_list);
|
|
list_move_tail (&itd->itd_list, &stream->td_list);
|
|
itd->stream = iso_stream_get (stream);
|
|
itd->urb = usb_get_urb (urb);
|
|
itd_init (stream, itd);
|
|
}
|
|
|
|
uframe = next_uframe & 0x07;
|
|
frame = next_uframe >> 3;
|
|
|
|
itd->usecs [uframe] = stream->usecs;
|
|
itd_patch (itd, iso_sched, packet, uframe);
|
|
|
|
next_uframe += stream->interval;
|
|
stream->depth += stream->interval;
|
|
next_uframe %= mod;
|
|
packet++;
|
|
|
|
/* link completed itds into the schedule */
|
|
if (((next_uframe >> 3) != frame)
|
|
|| packet == urb->number_of_packets) {
|
|
itd_link (ehci, frame % ehci->periodic_size, itd);
|
|
itd = NULL;
|
|
}
|
|
}
|
|
stream->next_uframe = next_uframe;
|
|
|
|
/* don't need that schedule data any more */
|
|
iso_sched_free (stream, iso_sched);
|
|
urb->hcpriv = NULL;
|
|
|
|
timer_action (ehci, TIMER_IO_WATCHDOG);
|
|
if (unlikely (!ehci->periodic_sched++))
|
|
return enable_periodic (ehci);
|
|
return 0;
|
|
}
|
|
|
|
#define ISO_ERRS (EHCI_ISOC_BUF_ERR | EHCI_ISOC_BABBLE | EHCI_ISOC_XACTERR)
|
|
|
|
static unsigned
|
|
itd_complete (
|
|
struct ehci_hcd *ehci,
|
|
struct ehci_itd *itd,
|
|
struct pt_regs *regs
|
|
) {
|
|
struct urb *urb = itd->urb;
|
|
struct usb_iso_packet_descriptor *desc;
|
|
u32 t;
|
|
unsigned uframe;
|
|
int urb_index = -1;
|
|
struct ehci_iso_stream *stream = itd->stream;
|
|
struct usb_device *dev;
|
|
|
|
/* for each uframe with a packet */
|
|
for (uframe = 0; uframe < 8; uframe++) {
|
|
if (likely (itd->index[uframe] == -1))
|
|
continue;
|
|
urb_index = itd->index[uframe];
|
|
desc = &urb->iso_frame_desc [urb_index];
|
|
|
|
t = le32_to_cpup (&itd->hw_transaction [uframe]);
|
|
itd->hw_transaction [uframe] = 0;
|
|
stream->depth -= stream->interval;
|
|
|
|
/* report transfer status */
|
|
if (unlikely (t & ISO_ERRS)) {
|
|
urb->error_count++;
|
|
if (t & EHCI_ISOC_BUF_ERR)
|
|
desc->status = usb_pipein (urb->pipe)
|
|
? -ENOSR /* hc couldn't read */
|
|
: -ECOMM; /* hc couldn't write */
|
|
else if (t & EHCI_ISOC_BABBLE)
|
|
desc->status = -EOVERFLOW;
|
|
else /* (t & EHCI_ISOC_XACTERR) */
|
|
desc->status = -EPROTO;
|
|
|
|
/* HC need not update length with this error */
|
|
if (!(t & EHCI_ISOC_BABBLE))
|
|
desc->actual_length = EHCI_ITD_LENGTH (t);
|
|
} else if (likely ((t & EHCI_ISOC_ACTIVE) == 0)) {
|
|
desc->status = 0;
|
|
desc->actual_length = EHCI_ITD_LENGTH (t);
|
|
}
|
|
}
|
|
|
|
usb_put_urb (urb);
|
|
itd->urb = NULL;
|
|
itd->stream = NULL;
|
|
list_move (&itd->itd_list, &stream->free_list);
|
|
iso_stream_put (ehci, stream);
|
|
|
|
/* handle completion now? */
|
|
if (likely ((urb_index + 1) != urb->number_of_packets))
|
|
return 0;
|
|
|
|
/* ASSERT: it's really the last itd for this urb
|
|
list_for_each_entry (itd, &stream->td_list, itd_list)
|
|
BUG_ON (itd->urb == urb);
|
|
*/
|
|
|
|
/* give urb back to the driver ... can be out-of-order */
|
|
dev = urb->dev;
|
|
ehci_urb_done (ehci, urb, regs);
|
|
urb = NULL;
|
|
|
|
/* defer stopping schedule; completion can submit */
|
|
ehci->periodic_sched--;
|
|
if (unlikely (!ehci->periodic_sched))
|
|
(void) disable_periodic (ehci);
|
|
ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs--;
|
|
|
|
if (unlikely (list_empty (&stream->td_list))) {
|
|
ehci_to_hcd(ehci)->self.bandwidth_allocated
|
|
-= stream->bandwidth;
|
|
ehci_vdbg (ehci,
|
|
"deschedule devp %s ep%d%s-iso\n",
|
|
dev->devpath, stream->bEndpointAddress & 0x0f,
|
|
(stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out");
|
|
}
|
|
iso_stream_put (ehci, stream);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static int itd_submit (struct ehci_hcd *ehci, struct urb *urb,
|
|
gfp_t mem_flags)
|
|
{
|
|
int status = -EINVAL;
|
|
unsigned long flags;
|
|
struct ehci_iso_stream *stream;
|
|
|
|
/* Get iso_stream head */
|
|
stream = iso_stream_find (ehci, urb);
|
|
if (unlikely (stream == NULL)) {
|
|
ehci_dbg (ehci, "can't get iso stream\n");
|
|
return -ENOMEM;
|
|
}
|
|
if (unlikely (urb->interval != stream->interval)) {
|
|
ehci_dbg (ehci, "can't change iso interval %d --> %d\n",
|
|
stream->interval, urb->interval);
|
|
goto done;
|
|
}
|
|
|
|
#ifdef EHCI_URB_TRACE
|
|
ehci_dbg (ehci,
|
|
"%s %s urb %p ep%d%s len %d, %d pkts %d uframes [%p]\n",
|
|
__FUNCTION__, urb->dev->devpath, urb,
|
|
usb_pipeendpoint (urb->pipe),
|
|
usb_pipein (urb->pipe) ? "in" : "out",
|
|
urb->transfer_buffer_length,
|
|
urb->number_of_packets, urb->interval,
|
|
stream);
|
|
#endif
|
|
|
|
/* allocate ITDs w/o locking anything */
|
|
status = itd_urb_transaction (stream, ehci, urb, mem_flags);
|
|
if (unlikely (status < 0)) {
|
|
ehci_dbg (ehci, "can't init itds\n");
|
|
goto done;
|
|
}
|
|
|
|
/* schedule ... need to lock */
|
|
spin_lock_irqsave (&ehci->lock, flags);
|
|
if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE,
|
|
&ehci_to_hcd(ehci)->flags)))
|
|
status = -ESHUTDOWN;
|
|
else
|
|
status = iso_stream_schedule (ehci, urb, stream);
|
|
if (likely (status == 0))
|
|
itd_link_urb (ehci, urb, ehci->periodic_size << 3, stream);
|
|
spin_unlock_irqrestore (&ehci->lock, flags);
|
|
|
|
done:
|
|
if (unlikely (status < 0))
|
|
iso_stream_put (ehci, stream);
|
|
return status;
|
|
}
|
|
|
|
#ifdef CONFIG_USB_EHCI_SPLIT_ISO
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/*
|
|
* "Split ISO TDs" ... used for USB 1.1 devices going through the
|
|
* TTs in USB 2.0 hubs. These need microframe scheduling.
|
|
*/
|
|
|
|
static inline void
|
|
sitd_sched_init (
|
|
struct ehci_iso_sched *iso_sched,
|
|
struct ehci_iso_stream *stream,
|
|
struct urb *urb
|
|
)
|
|
{
|
|
unsigned i;
|
|
dma_addr_t dma = urb->transfer_dma;
|
|
|
|
/* how many frames are needed for these transfers */
|
|
iso_sched->span = urb->number_of_packets * stream->interval;
|
|
|
|
/* figure out per-frame sitd fields that we'll need later
|
|
* when we fit new sitds into the schedule.
|
|
*/
|
|
for (i = 0; i < urb->number_of_packets; i++) {
|
|
struct ehci_iso_packet *packet = &iso_sched->packet [i];
|
|
unsigned length;
|
|
dma_addr_t buf;
|
|
u32 trans;
|
|
|
|
length = urb->iso_frame_desc [i].length & 0x03ff;
|
|
buf = dma + urb->iso_frame_desc [i].offset;
|
|
|
|
trans = SITD_STS_ACTIVE;
|
|
if (((i + 1) == urb->number_of_packets)
|
|
&& !(urb->transfer_flags & URB_NO_INTERRUPT))
|
|
trans |= SITD_IOC;
|
|
trans |= length << 16;
|
|
packet->transaction = cpu_to_le32 (trans);
|
|
|
|
/* might need to cross a buffer page within a td */
|
|
packet->bufp = buf;
|
|
packet->buf1 = (buf + length) & ~0x0fff;
|
|
if (packet->buf1 != (buf & ~(u64)0x0fff))
|
|
packet->cross = 1;
|
|
|
|
/* OUT uses multiple start-splits */
|
|
if (stream->bEndpointAddress & USB_DIR_IN)
|
|
continue;
|
|
length = (length + 187) / 188;
|
|
if (length > 1) /* BEGIN vs ALL */
|
|
length |= 1 << 3;
|
|
packet->buf1 |= length;
|
|
}
|
|
}
|
|
|
|
static int
|
|
sitd_urb_transaction (
|
|
struct ehci_iso_stream *stream,
|
|
struct ehci_hcd *ehci,
|
|
struct urb *urb,
|
|
gfp_t mem_flags
|
|
)
|
|
{
|
|
struct ehci_sitd *sitd;
|
|
dma_addr_t sitd_dma;
|
|
int i;
|
|
struct ehci_iso_sched *iso_sched;
|
|
unsigned long flags;
|
|
|
|
iso_sched = iso_sched_alloc (urb->number_of_packets, mem_flags);
|
|
if (iso_sched == NULL)
|
|
return -ENOMEM;
|
|
|
|
sitd_sched_init (iso_sched, stream, urb);
|
|
|
|
/* allocate/init sITDs */
|
|
spin_lock_irqsave (&ehci->lock, flags);
|
|
for (i = 0; i < urb->number_of_packets; i++) {
|
|
|
|
/* NOTE: for now, we don't try to handle wraparound cases
|
|
* for IN (using sitd->hw_backpointer, like a FSTN), which
|
|
* means we never need two sitds for full speed packets.
|
|
*/
|
|
|
|
/* free_list.next might be cache-hot ... but maybe
|
|
* the HC caches it too. avoid that issue for now.
|
|
*/
|
|
|
|
/* prefer previously-allocated sitds */
|
|
if (!list_empty(&stream->free_list)) {
|
|
sitd = list_entry (stream->free_list.prev,
|
|
struct ehci_sitd, sitd_list);
|
|
list_del (&sitd->sitd_list);
|
|
sitd_dma = sitd->sitd_dma;
|
|
} else
|
|
sitd = NULL;
|
|
|
|
if (!sitd) {
|
|
spin_unlock_irqrestore (&ehci->lock, flags);
|
|
sitd = dma_pool_alloc (ehci->sitd_pool, mem_flags,
|
|
&sitd_dma);
|
|
spin_lock_irqsave (&ehci->lock, flags);
|
|
}
|
|
|
|
if (!sitd) {
|
|
iso_sched_free (stream, iso_sched);
|
|
spin_unlock_irqrestore (&ehci->lock, flags);
|
|
return -ENOMEM;
|
|
}
|
|
memset (sitd, 0, sizeof *sitd);
|
|
sitd->sitd_dma = sitd_dma;
|
|
list_add (&sitd->sitd_list, &iso_sched->td_list);
|
|
}
|
|
|
|
/* temporarily store schedule info in hcpriv */
|
|
urb->hcpriv = iso_sched;
|
|
urb->error_count = 0;
|
|
|
|
spin_unlock_irqrestore (&ehci->lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static inline void
|
|
sitd_patch (
|
|
struct ehci_iso_stream *stream,
|
|
struct ehci_sitd *sitd,
|
|
struct ehci_iso_sched *iso_sched,
|
|
unsigned index
|
|
)
|
|
{
|
|
struct ehci_iso_packet *uf = &iso_sched->packet [index];
|
|
u64 bufp = uf->bufp;
|
|
|
|
sitd->hw_next = EHCI_LIST_END;
|
|
sitd->hw_fullspeed_ep = stream->address;
|
|
sitd->hw_uframe = stream->splits;
|
|
sitd->hw_results = uf->transaction;
|
|
sitd->hw_backpointer = EHCI_LIST_END;
|
|
|
|
bufp = uf->bufp;
|
|
sitd->hw_buf [0] = cpu_to_le32 (bufp);
|
|
sitd->hw_buf_hi [0] = cpu_to_le32 (bufp >> 32);
|
|
|
|
sitd->hw_buf [1] = cpu_to_le32 (uf->buf1);
|
|
if (uf->cross)
|
|
bufp += 4096;
|
|
sitd->hw_buf_hi [1] = cpu_to_le32 (bufp >> 32);
|
|
sitd->index = index;
|
|
}
|
|
|
|
static inline void
|
|
sitd_link (struct ehci_hcd *ehci, unsigned frame, struct ehci_sitd *sitd)
|
|
{
|
|
/* note: sitd ordering could matter (CSPLIT then SSPLIT) */
|
|
sitd->sitd_next = ehci->pshadow [frame];
|
|
sitd->hw_next = ehci->periodic [frame];
|
|
ehci->pshadow [frame].sitd = sitd;
|
|
sitd->frame = frame;
|
|
wmb ();
|
|
ehci->periodic [frame] = cpu_to_le32 (sitd->sitd_dma) | Q_TYPE_SITD;
|
|
}
|
|
|
|
/* fit urb's sitds into the selected schedule slot; activate as needed */
|
|
static int
|
|
sitd_link_urb (
|
|
struct ehci_hcd *ehci,
|
|
struct urb *urb,
|
|
unsigned mod,
|
|
struct ehci_iso_stream *stream
|
|
)
|
|
{
|
|
int packet;
|
|
unsigned next_uframe;
|
|
struct ehci_iso_sched *sched = urb->hcpriv;
|
|
struct ehci_sitd *sitd;
|
|
|
|
next_uframe = stream->next_uframe;
|
|
|
|
if (list_empty(&stream->td_list)) {
|
|
/* usbfs ignores TT bandwidth */
|
|
ehci_to_hcd(ehci)->self.bandwidth_allocated
|
|
+= stream->bandwidth;
|
|
ehci_vdbg (ehci,
|
|
"sched devp %s ep%d%s-iso [%d] %dms/%04x\n",
|
|
urb->dev->devpath, stream->bEndpointAddress & 0x0f,
|
|
(stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
|
|
(next_uframe >> 3) % ehci->periodic_size,
|
|
stream->interval, le32_to_cpu (stream->splits));
|
|
stream->start = jiffies;
|
|
}
|
|
ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs++;
|
|
|
|
/* fill sITDs frame by frame */
|
|
for (packet = 0, sitd = NULL;
|
|
packet < urb->number_of_packets;
|
|
packet++) {
|
|
|
|
/* ASSERT: we have all necessary sitds */
|
|
BUG_ON (list_empty (&sched->td_list));
|
|
|
|
/* ASSERT: no itds for this endpoint in this frame */
|
|
|
|
sitd = list_entry (sched->td_list.next,
|
|
struct ehci_sitd, sitd_list);
|
|
list_move_tail (&sitd->sitd_list, &stream->td_list);
|
|
sitd->stream = iso_stream_get (stream);
|
|
sitd->urb = usb_get_urb (urb);
|
|
|
|
sitd_patch (stream, sitd, sched, packet);
|
|
sitd_link (ehci, (next_uframe >> 3) % ehci->periodic_size,
|
|
sitd);
|
|
|
|
next_uframe += stream->interval << 3;
|
|
stream->depth += stream->interval << 3;
|
|
}
|
|
stream->next_uframe = next_uframe % mod;
|
|
|
|
/* don't need that schedule data any more */
|
|
iso_sched_free (stream, sched);
|
|
urb->hcpriv = NULL;
|
|
|
|
timer_action (ehci, TIMER_IO_WATCHDOG);
|
|
if (!ehci->periodic_sched++)
|
|
return enable_periodic (ehci);
|
|
return 0;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
#define SITD_ERRS (SITD_STS_ERR | SITD_STS_DBE | SITD_STS_BABBLE \
|
|
| SITD_STS_XACT | SITD_STS_MMF)
|
|
|
|
static unsigned
|
|
sitd_complete (
|
|
struct ehci_hcd *ehci,
|
|
struct ehci_sitd *sitd,
|
|
struct pt_regs *regs
|
|
) {
|
|
struct urb *urb = sitd->urb;
|
|
struct usb_iso_packet_descriptor *desc;
|
|
u32 t;
|
|
int urb_index = -1;
|
|
struct ehci_iso_stream *stream = sitd->stream;
|
|
struct usb_device *dev;
|
|
|
|
urb_index = sitd->index;
|
|
desc = &urb->iso_frame_desc [urb_index];
|
|
t = le32_to_cpup (&sitd->hw_results);
|
|
|
|
/* report transfer status */
|
|
if (t & SITD_ERRS) {
|
|
urb->error_count++;
|
|
if (t & SITD_STS_DBE)
|
|
desc->status = usb_pipein (urb->pipe)
|
|
? -ENOSR /* hc couldn't read */
|
|
: -ECOMM; /* hc couldn't write */
|
|
else if (t & SITD_STS_BABBLE)
|
|
desc->status = -EOVERFLOW;
|
|
else /* XACT, MMF, etc */
|
|
desc->status = -EPROTO;
|
|
} else {
|
|
desc->status = 0;
|
|
desc->actual_length = desc->length - SITD_LENGTH (t);
|
|
}
|
|
|
|
usb_put_urb (urb);
|
|
sitd->urb = NULL;
|
|
sitd->stream = NULL;
|
|
list_move (&sitd->sitd_list, &stream->free_list);
|
|
stream->depth -= stream->interval << 3;
|
|
iso_stream_put (ehci, stream);
|
|
|
|
/* handle completion now? */
|
|
if ((urb_index + 1) != urb->number_of_packets)
|
|
return 0;
|
|
|
|
/* ASSERT: it's really the last sitd for this urb
|
|
list_for_each_entry (sitd, &stream->td_list, sitd_list)
|
|
BUG_ON (sitd->urb == urb);
|
|
*/
|
|
|
|
/* give urb back to the driver */
|
|
dev = urb->dev;
|
|
ehci_urb_done (ehci, urb, regs);
|
|
urb = NULL;
|
|
|
|
/* defer stopping schedule; completion can submit */
|
|
ehci->periodic_sched--;
|
|
if (!ehci->periodic_sched)
|
|
(void) disable_periodic (ehci);
|
|
ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs--;
|
|
|
|
if (list_empty (&stream->td_list)) {
|
|
ehci_to_hcd(ehci)->self.bandwidth_allocated
|
|
-= stream->bandwidth;
|
|
ehci_vdbg (ehci,
|
|
"deschedule devp %s ep%d%s-iso\n",
|
|
dev->devpath, stream->bEndpointAddress & 0x0f,
|
|
(stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out");
|
|
}
|
|
iso_stream_put (ehci, stream);
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int sitd_submit (struct ehci_hcd *ehci, struct urb *urb,
|
|
gfp_t mem_flags)
|
|
{
|
|
int status = -EINVAL;
|
|
unsigned long flags;
|
|
struct ehci_iso_stream *stream;
|
|
|
|
/* Get iso_stream head */
|
|
stream = iso_stream_find (ehci, urb);
|
|
if (stream == NULL) {
|
|
ehci_dbg (ehci, "can't get iso stream\n");
|
|
return -ENOMEM;
|
|
}
|
|
if (urb->interval != stream->interval) {
|
|
ehci_dbg (ehci, "can't change iso interval %d --> %d\n",
|
|
stream->interval, urb->interval);
|
|
goto done;
|
|
}
|
|
|
|
#ifdef EHCI_URB_TRACE
|
|
ehci_dbg (ehci,
|
|
"submit %p dev%s ep%d%s-iso len %d\n",
|
|
urb, urb->dev->devpath,
|
|
usb_pipeendpoint (urb->pipe),
|
|
usb_pipein (urb->pipe) ? "in" : "out",
|
|
urb->transfer_buffer_length);
|
|
#endif
|
|
|
|
/* allocate SITDs */
|
|
status = sitd_urb_transaction (stream, ehci, urb, mem_flags);
|
|
if (status < 0) {
|
|
ehci_dbg (ehci, "can't init sitds\n");
|
|
goto done;
|
|
}
|
|
|
|
/* schedule ... need to lock */
|
|
spin_lock_irqsave (&ehci->lock, flags);
|
|
if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE,
|
|
&ehci_to_hcd(ehci)->flags)))
|
|
status = -ESHUTDOWN;
|
|
else
|
|
status = iso_stream_schedule (ehci, urb, stream);
|
|
if (status == 0)
|
|
sitd_link_urb (ehci, urb, ehci->periodic_size << 3, stream);
|
|
spin_unlock_irqrestore (&ehci->lock, flags);
|
|
|
|
done:
|
|
if (status < 0)
|
|
iso_stream_put (ehci, stream);
|
|
return status;
|
|
}
|
|
|
|
#else
|
|
|
|
static inline int
|
|
sitd_submit (struct ehci_hcd *ehci, struct urb *urb, gfp_t mem_flags)
|
|
{
|
|
ehci_dbg (ehci, "split iso support is disabled\n");
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline unsigned
|
|
sitd_complete (
|
|
struct ehci_hcd *ehci,
|
|
struct ehci_sitd *sitd,
|
|
struct pt_regs *regs
|
|
) {
|
|
ehci_err (ehci, "sitd_complete %p?\n", sitd);
|
|
return 0;
|
|
}
|
|
|
|
#endif /* USB_EHCI_SPLIT_ISO */
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static void
|
|
scan_periodic (struct ehci_hcd *ehci, struct pt_regs *regs)
|
|
{
|
|
unsigned frame, clock, now_uframe, mod;
|
|
unsigned modified;
|
|
|
|
mod = ehci->periodic_size << 3;
|
|
|
|
/*
|
|
* When running, scan from last scan point up to "now"
|
|
* else clean up by scanning everything that's left.
|
|
* Touches as few pages as possible: cache-friendly.
|
|
*/
|
|
now_uframe = ehci->next_uframe;
|
|
if (HC_IS_RUNNING (ehci_to_hcd(ehci)->state))
|
|
clock = readl (&ehci->regs->frame_index);
|
|
else
|
|
clock = now_uframe + mod - 1;
|
|
clock %= mod;
|
|
|
|
for (;;) {
|
|
union ehci_shadow q, *q_p;
|
|
__le32 type, *hw_p;
|
|
unsigned uframes;
|
|
|
|
/* don't scan past the live uframe */
|
|
frame = now_uframe >> 3;
|
|
if (frame == (clock >> 3))
|
|
uframes = now_uframe & 0x07;
|
|
else {
|
|
/* safe to scan the whole frame at once */
|
|
now_uframe |= 0x07;
|
|
uframes = 8;
|
|
}
|
|
|
|
restart:
|
|
/* scan each element in frame's queue for completions */
|
|
q_p = &ehci->pshadow [frame];
|
|
hw_p = &ehci->periodic [frame];
|
|
q.ptr = q_p->ptr;
|
|
type = Q_NEXT_TYPE (*hw_p);
|
|
modified = 0;
|
|
|
|
while (q.ptr != NULL) {
|
|
unsigned uf;
|
|
union ehci_shadow temp;
|
|
int live;
|
|
|
|
live = HC_IS_RUNNING (ehci_to_hcd(ehci)->state);
|
|
switch (type) {
|
|
case Q_TYPE_QH:
|
|
/* handle any completions */
|
|
temp.qh = qh_get (q.qh);
|
|
type = Q_NEXT_TYPE (q.qh->hw_next);
|
|
q = q.qh->qh_next;
|
|
modified = qh_completions (ehci, temp.qh, regs);
|
|
if (unlikely (list_empty (&temp.qh->qtd_list)))
|
|
intr_deschedule (ehci, temp.qh);
|
|
qh_put (temp.qh);
|
|
break;
|
|
case Q_TYPE_FSTN:
|
|
/* for "save place" FSTNs, look at QH entries
|
|
* in the previous frame for completions.
|
|
*/
|
|
if (q.fstn->hw_prev != EHCI_LIST_END) {
|
|
dbg ("ignoring completions from FSTNs");
|
|
}
|
|
type = Q_NEXT_TYPE (q.fstn->hw_next);
|
|
q = q.fstn->fstn_next;
|
|
break;
|
|
case Q_TYPE_ITD:
|
|
/* skip itds for later in the frame */
|
|
rmb ();
|
|
for (uf = live ? uframes : 8; uf < 8; uf++) {
|
|
if (0 == (q.itd->hw_transaction [uf]
|
|
& ITD_ACTIVE))
|
|
continue;
|
|
q_p = &q.itd->itd_next;
|
|
hw_p = &q.itd->hw_next;
|
|
type = Q_NEXT_TYPE (q.itd->hw_next);
|
|
q = *q_p;
|
|
break;
|
|
}
|
|
if (uf != 8)
|
|
break;
|
|
|
|
/* this one's ready ... HC won't cache the
|
|
* pointer for much longer, if at all.
|
|
*/
|
|
*q_p = q.itd->itd_next;
|
|
*hw_p = q.itd->hw_next;
|
|
type = Q_NEXT_TYPE (q.itd->hw_next);
|
|
wmb();
|
|
modified = itd_complete (ehci, q.itd, regs);
|
|
q = *q_p;
|
|
break;
|
|
case Q_TYPE_SITD:
|
|
if ((q.sitd->hw_results & SITD_ACTIVE)
|
|
&& live) {
|
|
q_p = &q.sitd->sitd_next;
|
|
hw_p = &q.sitd->hw_next;
|
|
type = Q_NEXT_TYPE (q.sitd->hw_next);
|
|
q = *q_p;
|
|
break;
|
|
}
|
|
*q_p = q.sitd->sitd_next;
|
|
*hw_p = q.sitd->hw_next;
|
|
type = Q_NEXT_TYPE (q.sitd->hw_next);
|
|
wmb();
|
|
modified = sitd_complete (ehci, q.sitd, regs);
|
|
q = *q_p;
|
|
break;
|
|
default:
|
|
dbg ("corrupt type %d frame %d shadow %p",
|
|
type, frame, q.ptr);
|
|
// BUG ();
|
|
q.ptr = NULL;
|
|
}
|
|
|
|
/* assume completion callbacks modify the queue */
|
|
if (unlikely (modified))
|
|
goto restart;
|
|
}
|
|
|
|
/* stop when we catch up to the HC */
|
|
|
|
// FIXME: this assumes we won't get lapped when
|
|
// latencies climb; that should be rare, but...
|
|
// detect it, and just go all the way around.
|
|
// FLR might help detect this case, so long as latencies
|
|
// don't exceed periodic_size msec (default 1.024 sec).
|
|
|
|
// FIXME: likewise assumes HC doesn't halt mid-scan
|
|
|
|
if (now_uframe == clock) {
|
|
unsigned now;
|
|
|
|
if (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state))
|
|
break;
|
|
ehci->next_uframe = now_uframe;
|
|
now = readl (&ehci->regs->frame_index) % mod;
|
|
if (now_uframe == now)
|
|
break;
|
|
|
|
/* rescan the rest of this frame, then ... */
|
|
clock = now;
|
|
} else {
|
|
now_uframe++;
|
|
now_uframe %= mod;
|
|
}
|
|
}
|
|
}
|