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linux/drivers/usb/host
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Sarah Sharp c06d68b814 USB: xhci: Minimize HW event ring dequeue pointer writes. 
The xHCI specification suggests that writing the hardware event ring dequeue
pointer register too often can be an expensive operation for the xHCI hardware
to manage.  It suggests minimizing the number of writes to that register.

Originally, the driver wrote the event ring dequeue pointer after each
event was processed.  Depending on how the event ring moderation register
is set up and how fast the transfers are completing, there may be several
events processed for each interrupt.  This patch makes the hardware event
ring dequeue pointer be written only once per interrupt.

Make the transfer event handler and port status event handler only write
the software event ring dequeue pointer.  Move the updating of the
hardware event ring dequeue pointer into the interrupt function.  Move the
contents of xhci_set_hc_event_deq() into the interrupt handler.  The
interrupt handler must clear the event handler busy flag, so it might as
well also write the dequeue pointer to the same register.  This eliminates
two 32-bit PCI reads and two 32-bit PCI writes.

Reported-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-10 14:35:44 -07:00
..
whci USB: convert usb_hcd bitfields into atomic flags 2010-08-10 14:35:37 -07:00
ehci-atmel.c USB: ehci-atmel.c: use resource_size() 2010-03-02 14:53:18 -08:00
ehci-au1xxx.c USB: add do_wakeup parameter for PCI HCD suspend 2010-08-10 14:35:37 -07:00
ehci-dbg.c USB: ehci: fix remove of ehci debugfs dir 2010-08-10 14:35:44 -07:00
ehci-fsl.c USB: add do_wakeup parameter for PCI HCD suspend 2010-08-10 14:35:37 -07:00
ehci-fsl.h
ehci-hcd.c USB: EHCI: add missing frame -> microframe conversion 2010-08-10 14:35:40 -07:00
ehci-hub.c USB: controller resume should check the root hub 2010-08-10 14:35:37 -07:00
ehci-ixp4xx.c USB: EHCI: use the new clear_tt_buffer interface 2009-07-12 15:16:39 -07:00
ehci-lpm.c USB: EHCI: EHCI 1.1 addendum: Basic LPM feature support 2010-08-10 14:35:35 -07:00
ehci-mem.c USB: EHCI: defer reclamation of siTDs 2010-04-22 15:18:28 -07:00
ehci-mxc.c Merge branch 'for-rmk' of git://git.pengutronix.de/git/imx/linux-2.6 into devel-stable 2010-07-29 15:48:37 +01:00
ehci-omap.c USB: ehci_omap: fix device detect issue with modules 2010-08-10 14:35:39 -07:00
ehci-orion.c USB: ehci-orion.c: use resource_size() 2010-03-02 14:53:17 -08:00
ehci-pci.c USB: EHCI: remove PCI assumption 2010-08-10 14:35:40 -07:00
ehci-ppc-of.c of: Remove duplicate fields from of_platform_driver 2010-05-22 00:10:40 -06:00
ehci-ps3.c USB: EHCI: use the new clear_tt_buffer interface 2009-07-12 15:16:39 -07:00
ehci-q.c USB: convert usb_hcd bitfields into atomic flags 2010-08-10 14:35:37 -07:00
ehci-sched.c USB: EHCI: remove dead code in the periodic scheduler 2010-08-10 14:35:40 -07:00
ehci-w90x900.c USB: Add nuvoton Ehci driver for w90p910 platform 2009-09-23 06:46:20 -07:00
ehci-xilinx-of.c of/usb: fix build error due to of_node pointer move 2010-06-02 13:35:02 -06:00
ehci.h USB: ehci: fix remove of ehci debugfs dir 2010-08-10 14:35:44 -07:00
fhci-dbg.c USB: make hcd.h public (drivers dependency) 2010-05-20 13:21:30 -07:00
fhci-hcd.c Merge remote branch 'origin' into secretlab/next-devicetree 2010-05-22 00:36:56 -06:00
fhci-hub.c USB: make hcd.h public (drivers dependency) 2010-05-20 13:21:30 -07:00
fhci-mem.c USB: make hcd.h public (drivers dependency) 2010-05-20 13:21:30 -07:00
fhci-q.c USB: make hcd.h public (drivers dependency) 2010-05-20 13:21:30 -07:00
fhci-sched.c fix comment/printk typos concerning "already" 2010-07-11 21:45:40 +02:00
fhci-tds.c USB: make hcd.h public (drivers dependency) 2010-05-20 13:21:30 -07:00
fhci.h USB: FHCI: cq_get() should check kfifo_out()'s return value 2010-05-20 13:21:46 -07:00
hwa-hc.c USB: convert usb_hcd bitfields into atomic flags 2010-08-10 14:35:37 -07:00
imx21-dbg.c USB: MXC: Add i.MX21 specific USB host controller driver. 2010-03-02 14:52:55 -08:00
imx21-hcd.c usb: imx21-hcd: set task state with schedule_timeout_uninterruptible() 2010-08-10 14:35:43 -07:00
imx21-hcd.h USB: MXC: Add i.MX21 specific USB host controller driver. 2010-03-02 14:52:55 -08:00
isp116x-hcd.c USB: make hcd.h public (drivers dependency) 2010-05-20 13:21:30 -07:00
isp116x.h USB: add missing KERN_* constants to printks 2009-03-24 16:20:30 -07:00
isp1362-hcd.c USB: isp1362-hcd, fix double lock 2010-06-30 08:16:06 -07:00
isp1362.h USB: host: Remove dead CONFIG_ARCH_KARO 2010-08-10 14:35:40 -07:00
isp1760-hcd.c USB: convert usb_hcd bitfields into atomic flags 2010-08-10 14:35:37 -07:00
isp1760-hcd.h USB: isp1760: allow platform devices to customize devflags 2009-09-23 06:46:29 -07:00
isp1760-if.c Merge remote branch 'origin' into secretlab/next-devicetree 2010-05-22 00:36:56 -06:00
Kconfig USB: EHCI: make CONFIG_USB_EHCI_TT_NEWSCHED default to Y 2010-08-10 14:35:34 -07:00
Makefile USB: xhci: rename driver to xhci_hcd 2010-03-19 07:24:08 -07:00
ohci-at91.c USB: ohci-at91: fix power management hanging 2010-04-30 09:25:12 -07:00
ohci-au1xxx.c const: constify remaining dev_pm_ops 2009-12-15 08:53:25 -08:00
ohci-da8xx.c USB: OHCI: DA8xx/OMAP-L1x: fix up macro rename 2010-04-22 15:18:24 -07:00
ohci-dbg.c USB: convert usb_hcd bitfields into atomic flags 2010-08-10 14:35:37 -07:00
ohci-ep93xx.c USB: ohci-ep93xx.c: remove unused variable 2009-09-23 06:46:34 -07:00
ohci-hcd.c USB: convert usb_hcd bitfields into atomic flags 2010-08-10 14:35:37 -07:00
ohci-hub.c USB: controller resume should check the root hub 2010-08-10 14:35:37 -07:00
ohci-jz4740.c USB: Add JZ4740 OHCI support 2010-08-05 13:26:19 +01:00
ohci-lh7a404.c USB: Convert concatenated __FILE__ to %s, __FILE__ 2010-03-02 14:54:59 -08:00
ohci-mem.c
ohci-omap.c omap: headers: Move remaining headers from include/mach to include/plat 2009-10-20 09:40:47 -07:00
ohci-omap3.c USB: ohci: introduce omap3 ohci-hcd driver 2010-05-20 13:21:44 -07:00
ohci-pci.c USB: add do_wakeup parameter for PCI HCD suspend 2010-08-10 14:35:37 -07:00
ohci-pnx4008.c USB: fix I2C API usage in ohci-pnx4008. 2010-03-02 14:55:15 -08:00
ohci-pnx8550.c
ohci-ppc-of.c of: Remove duplicate fields from of_platform_driver 2010-05-22 00:10:40 -06:00
ohci-ppc-soc.c USB: Convert concatenated __FILE__ to %s, __FILE__ 2010-03-02 14:54:59 -08:00
ohci-ps3.c usb/ps3: Add missing annotations 2009-06-16 14:17:32 +10:00
ohci-pxa27x.c [ARM] pxa: fix incorrect CONFIG_CPU_PXA27x to CONFIG_PXA27x 2010-07-15 17:20:23 +08:00
ohci-q.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
ohci-s3c2410.c USB: S3C: Move usb-control.h to platform include 2009-03-24 16:20:45 -07:00
ohci-sa1111.c USB: Convert concatenated __FILE__ to %s, __FILE__ 2010-03-02 14:54:59 -08:00
ohci-sh.c
ohci-sm501.c
ohci-ssb.c USB: Add USB 2.0 to ssb ohci driver 2010-08-10 14:35:44 -07:00
ohci-tmio.c usb: struct device - replace bus_id with dev_name(), dev_set_name() 2009-01-07 09:59:52 -08:00
ohci.h USB: ohci: quirk AMD prefetch for USB 1.1 ISO transfer 2009-11-17 16:46:33 -08:00
oxu210hp-hcd.c USB: convert usb_hcd bitfields into atomic flags 2010-08-10 14:35:37 -07:00
oxu210hp.h USB: replace uses of __constant_{endian} 2009-03-24 16:20:33 -07:00
pci-quirks.c Revert "USB: Work around BIOS bugs by quiescing USB controllers earlier" 2009-10-11 15:57:57 -07:00
pci-quirks.h
r8a66597-hcd.c USB: r8a66597: Fix failure in change of status 2010-06-30 08:16:05 -07:00
r8a66597.h usb: r8a66597-hcd pio to mmio accessor conversion. 2010-06-02 16:31:15 +09:00
sl811-hcd.c usb: host: sl811-hcd: check kzalloc() result 2010-08-10 14:35:42 -07:00
sl811.h
sl811_cs.c pcmcia: do not use io_req_t when calling pcmcia_request_io() 2010-08-03 09:04:11 +02:00
u132-hcd.c USB: fix u132-hcd code/data warning 2010-05-20 13:21:43 -07:00
uhci-debug.c USB-BKL: Remove BKL use in uhci-debug 2010-08-10 14:35:36 -07:00
uhci-hcd.c USB: UHCI: add support for Intel's wakeup flags 2010-08-10 14:35:38 -07:00
uhci-hcd.h USB: UHCI: add support for Intel's wakeup flags 2010-08-10 14:35:38 -07:00
uhci-hub.c USB: controller resume should check the root hub 2010-08-10 14:35:37 -07:00
uhci-q.c USB: UHCI: acquire spinlock before calling start_rh() 2010-08-10 14:35:33 -07:00
xhci-dbg.c USB: xhci: Correct assumptions about number of rings per endpoint. 2010-05-20 13:21:38 -07:00
xhci-ext-caps.h USB: xhci: Fix finding extended capabilities registers 2010-03-02 14:55:02 -08:00
xhci-hub.c USB: xhci: Remove the arbitrary limit of 15 xHCI ports 2010-05-20 13:21:45 -07:00
xhci-mem.c USB: xhci: Performance - move functions that find ep ring. 2010-08-10 14:35:44 -07:00
xhci-pci.c USB: xhci: Print NEC firmware version. 2010-06-04 13:16:19 -07:00
xhci-ring.c USB: xhci: Minimize HW event ring dequeue pointer writes. 2010-08-10 14:35:44 -07:00
xhci.c USB: xhci: Performance - move interrupt handlers into xhci-ring.c 2010-08-10 14:35:44 -07:00
xhci.h USB: xhci: Make xhci_handle_event() static. 2010-08-10 14:35:44 -07:00