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55934eb3b9
linux/drivers/usb/host
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Alan Stern 55934eb3b9 USB: EHCI: use hrtimer for (s)iTD deallocation 
This patch (as1579) adds an hrtimer event to handle deallocation of
iTDs and siTDs in ehci-hcd.

Because of the frame-oriented approach used by the EHCI periodic
schedule, the hardware can continue to access the Transfer Descriptor
for isochronous (or split-isochronous) transactions for up to a
millisecond after the transaction completes.  The iTD (or siTD) must
not be reused before then.

The strategy currently used involves putting completed iTDs on a list
of cached entries and every so often returning them to the endpoint's
free list.  The new strategy reduces overhead by putting completed
iTDs back on the free list immediately, although they are not reused
until it is safe to do so.

When the isochronous endpoint stops (its queue becomes empty), the
iTDs on its free list get moved to a global list, from which they will
be deallocated after a minimum of 2 ms.  This delay is what the new
hrtimer event is for.

Overall this may not be a tremendous improvement over the current
code, but to me it seems a lot more clear and logical.  In addition,
it removes the need for each iTD to keep a reference to the
ehci_iso_stream it belongs to, since the iTD never needs to be moved
back to the stream's free list from the global list.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-16 16:54:25 -07:00
..
whci Merge branch 'for-next/dwc3' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-next 2011-12-12 15:19:53 -08:00
alchemy-common.c MIPS: Alchemy: Au1300 SoC support 2011-12-07 22:02:05 +00:00
bcma-hcd.c usb/bcma: Add missing #include <linux/slab.h> 2012-04-23 13:22:00 -07:00
ehci-atmel.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-au1xxx.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-cns3xxx.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-dbg.c USB: EHCI: add new root-hub state: STOPPING 2012-07-16 16:50:14 -07:00
ehci-fsl.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-fsl.h fsl/usb: Add controller version based ULPI and UTMI phy support 2012-04-18 13:46:42 -07:00
ehci-grlib.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-hcd.c USB: EHCI: use hrtimer for (s)iTD deallocation 2012-07-16 16:54:25 -07:00
ehci-hub.c USB: EHCI: use hrtimer for (s)iTD deallocation 2012-07-16 16:54:25 -07:00
ehci-ixp4xx.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-lpm.c
ehci-ls1x.c USB: Add EHCI bus glue for Loongson1x SoCs (UPDATED) 2012-01-24 15:28:02 -08:00
ehci-mem.c USB: EHCI: use hrtimer for (s)iTD deallocation 2012-07-16 16:54:25 -07:00
ehci-msm.c EHCI: centralize controller suspend/resume 2012-07-09 08:54:18 -07:00
ehci-mv.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-mxc.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-octeon.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-omap.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-orion.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-pci.c USB: EHCI: use hrtimer for the periodic schedule 2012-07-16 16:53:16 -07:00
ehci-platform.c EHCI: centralize controller suspend/resume 2012-07-09 08:54:18 -07:00
ehci-pmcmsp.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-ppc-of.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-ps3.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-q.c USB: EHCI: use hrtimer for async schedule 2012-07-16 16:54:25 -07:00
ehci-s5p.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-sched.c USB: EHCI: use hrtimer for (s)iTD deallocation 2012-07-16 16:54:25 -07:00
ehci-sead3.c EHCI: centralize controller suspend/resume 2012-07-09 08:54:18 -07:00
ehci-sh.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-spear.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-sysfs.c
ehci-tegra.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-timer.c USB: EHCI: use hrtimer for (s)iTD deallocation 2012-07-16 16:54:25 -07:00
ehci-vt8500.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-w90x900.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-xilinx-of.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci-xls.c EHCI: centralize controller initialization 2012-07-09 13:35:05 -07:00
ehci.h USB: EHCI: use hrtimer for (s)iTD deallocation 2012-07-16 16:54:25 -07:00
fhci-dbg.c USB: FHCI: Reusing QUICC Engine USB Controller registers from immap_qe.h 2012-06-26 19:42:11 -07:00
fhci-hcd.c USB: FHCI: Reusing QUICC Engine USB Controller registers from immap_qe.h 2012-06-26 19:42:11 -07:00
fhci-hub.c USB: FHCI: Reusing QUICC Engine USB Controller registers from immap_qe.h 2012-06-26 19:42:11 -07:00
fhci-mem.c
fhci-q.c
fhci-sched.c USB: FHCI: Reusing QUICC Engine USB Controller registers from immap_qe.h 2012-06-26 19:42:11 -07:00
fhci-tds.c USB: FHCI: Reusing QUICC Engine USB Controller registers from immap_qe.h 2012-06-26 19:42:11 -07:00
fhci.h USB: FHCI: Reusing QUICC Engine USB Controller registers from immap_qe.h 2012-06-26 19:42:11 -07:00
fsl-mph-dr-of.c fsl/usb: Add controller version based ULPI and UTMI phy support 2012-04-18 13:46:42 -07:00
hwa-hc.c Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb 2012-01-09 12:09:47 -08:00
imx21-dbg.c usb: Fix typo in imx21-dbg.c 2012-02-13 14:32:34 -08:00
imx21-hcd.c usb: imx21-hcd.c: Use clk_prepare_enable/clk_disable_unprepare 2012-06-12 13:31:03 +03:00
imx21-hcd.h
isp116x-hcd.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
isp116x.h
isp1362-hcd.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
isp1362.h
isp1760-hcd.c isp1760-hcd: fix possible memory leak if urb could not be enqueued 2012-04-18 13:51:19 -07:00
isp1760-hcd.h usb/isp1760: Allow to optionally trigger low-level chip reset via GPIOLIB. 2011-10-19 13:29:06 -07:00
isp1760-if.c isp1760-if: make module unloads correctly 2012-04-18 13:50:44 -07:00
Kconfig usb: correct trivial typo in drivers/usb/host/Kconfig 2012-06-15 15:05:34 -07:00
Makefile USB: Add driver for the ssb bus 2012-04-18 13:43:30 -07:00
octeon2-common.c
ohci-at91.c USB: ohci-at91: add a reset function to fix race condition 2012-05-09 15:22:27 -07:00
ohci-au1xxx.c usb: [MIPS] fix unresolved err() reference in host/ohci-au1xxx.c 2012-05-01 18:36:09 -04:00
ohci-cns3xxx.c USB: ohci-cns3xxx.c: remove err() usage 2012-04-27 11:24:40 -07:00
ohci-da8xx.c ohci-da8xx: set MODULE_ALIAS to allow autoloading 2012-05-08 09:26:10 -07:00
ohci-dbg.c USB: ohci-dbg.c: remove dbg() usage 2012-05-01 21:33:37 -07:00
ohci-ep93xx.c USB: ohci-ep93xx.c: remove dbg() usage 2012-05-01 21:33:38 -07:00
ohci-exynos.c USB: ohci-exynos: use devm_ functions 2012-07-06 10:42:21 -07:00
ohci-hcd.c USB: OHCI: remove old SSB OHCI driver 2012-04-18 13:43:30 -07:00
ohci-hub.c USB: ohci-hub: Mark ohci_finish_controller_resume() as __maybe_unused 2012-06-13 17:26:11 -07:00
ohci-jz4740.c
ohci-mem.c
ohci-nxp.c USB: ohci-nxp: add usbd and otg clock initialization 2012-06-20 16:20:24 -07:00
ohci-octeon.c
ohci-omap3.c ARM: OMAP: USBHOST: Replace usbhs core driver APIs by Runtime pm APIs 2011-12-16 04:29:57 -07:00
ohci-omap.c usb: phy: patches for v3.6 merge window 2012-07-05 15:35:41 -07:00
ohci-pci.c usb: add support for STA2X11 host driver 2012-01-24 14:15:37 -08:00
ohci-platform.c usb: Fix various typo within usb 2012-04-18 13:57:26 -07:00
ohci-pnx8550.c usb: [MIPS] fix unresolved err() reference in host/ohci-pnx8550.c 2012-05-01 18:36:09 -04:00
ohci-ppc-of.c USB: ohci-ppc-of.c: remove err() usage 2012-04-27 11:24:42 -07:00
ohci-ppc-soc.c USB: ohci-ppc-soc.c: remove err() usage 2012-04-27 11:24:42 -07:00
ohci-ps3.c USB: ohci-ps3.c: remove err() usage 2012-04-27 11:24:43 -07:00
ohci-pxa27x.c usb: [ARM] fix unresolved err() reference in host/ohci-pxa27x.c 2012-05-01 18:36:09 -04:00
ohci-q.c OHCI: remove uses of hcd->state 2011-11-18 10:51:00 -08:00
ohci-s3c2410.c USB: ohci-s3c2410.c: remove err() usage 2012-04-27 11:24:43 -07:00
ohci-sa1111.c USB: ohci-sa1111.c: remove dbg() usage 2012-05-01 21:33:39 -07:00
ohci-sh.c USB: ohci-sh.c: remove err() usage 2012-04-27 11:24:44 -07:00
ohci-sm501.c OHCI: remove uses of hcd->state 2011-11-18 10:51:00 -08:00
ohci-spear.c USB: ehci: ohci: Add clk_{un}prepare() support 2012-04-18 14:33:43 -07:00
ohci-tmio.c USB: ohci-tmio.c: remove err() usage 2012-04-27 11:24:44 -07:00
ohci-xls.c USB: ohci-xls.c: remove err() usage 2012-04-27 11:24:45 -07:00
ohci.h USB: move transceiver from ehci_hcd and ohci_hcd to hcd and rename it as phy 2012-06-13 12:38:36 -07:00
oxu210hp-hcd.c USB: oxu210hp-hcd.c: remove dbg() usage 2012-05-01 21:33:43 -07:00
oxu210hp.h
pci-quirks.c xhci: Add Lynx Point to list of Intel switchable hosts. 2012-05-03 13:18:40 -07:00
pci-quirks.h
r8a66597-hcd.c Revert "usb: move struct usb_device->children to struct usb_hub_port->child" 2012-05-14 09:20:37 -07:00
r8a66597.h
sl811_cs.c
sl811-hcd.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
sl811.h
ssb-hcd.c usb/ssb: Add missing #include <linux/slab.h> 2012-04-23 13:22:00 -07:00
u132-hcd.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
uhci-debug.c
uhci-grlib.c
uhci-hcd.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
uhci-hcd.h
uhci-hub.c UHCI: hub_status_data should indicate if ports are resuming 2012-04-09 15:43:21 -07:00
uhci-pci.c
uhci-q.c usb: fix number of mapped SG DMA entries 2011-12-09 16:18:19 -08:00
xhci-dbg.c xHCI: correct to print the true HSEE of USBCMD 2012-04-10 15:21:52 -07:00
xhci-ext-caps.h xHCI: Correct the #define XHCI_LEGACY_DISABLE_SMI 2012-04-11 08:31:06 -07:00
xhci-hub.c usb: Add support for root hub port status CAS 2012-07-02 12:51:24 -07:00
xhci-mem.c xhci: Don't free endpoints in xhci_mem_cleanup() 2012-06-13 16:37:30 -07:00
xhci-pci.c xhci: Add Intel U1/U2 timeout policy. 2012-05-18 15:42:04 -07:00
xhci-plat.c usb: host: xhci: add platform driver support 2012-03-13 10:30:59 -07:00
xhci-ring.c xhci: Fix hang on back-to-back Set TR Deq Ptr commands. 2012-07-02 12:51:25 -07:00
xhci.c usbdevfs: Add a USBDEVFS_GET_CAPABILITIES ioctl 2012-07-06 10:53:19 -07:00
xhci.h usb: Add support for root hub port status CAS 2012-07-02 12:51:24 -07:00