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core/linux-omap to 3.1.5-1
This commit is contained in:
Kevin Mihelich
parent
a641c6ed60
commit
471489dfa4
3 changed files with 105 additions and 8 deletions
93
core/linux-omap/0006-omap4-usb-improvement.patch
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93
core/linux-omap/0006-omap4-usb-improvement.patch
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@ -0,0 +1,93 @@
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From f392cbf75615e9d8cb90ef5ffb8d4e752b7be3c7 Mon Sep 17 00:00:00 2001
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From: Ming Lei <ming.lei@canonical.com>
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Date: Wed, 31 Aug 2011 00:03:13 +0800
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Subject: [PATCH] usb: ehci: make HC see up-to-date qh/qtd descriptor ASAP
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This patch introduces the helper of ehci_sync_mem to flush
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qtd/qh into memory immediately on some ARM, so that HC can
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see the up-to-date qtd/qh descriptor asap.
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This patch fixs one performance bug on ARM Cortex A9 dual core
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platform, which has been reported on quite a few ARM machines
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(OMAP4, Tegra 2, snowball...), see details from link of
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https://bugs.launchpad.net/bugs/709245.
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The patch has been tested ok on OMAP4 panda A1 board, and the
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performance of 'dd' over usb mass storage can be increased from
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4~5MB/sec to 14~16MB/sec after applying this patch.
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Cc: Russell King <linux@arm.linux.org.uk>
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Signed-off-by: Ming Lei <ming.lei@canonical.com>
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Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
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---
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drivers/usb/host/ehci-q.c | 18 ++++++++++++++++++
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drivers/usb/host/ehci.h | 17 +++++++++++++++++
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2 files changed, 35 insertions(+), 0 deletions(-)
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diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
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index 0917e3a..b7f9496 100644
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--- a/drivers/usb/host/ehci-q.c
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+++ b/drivers/usb/host/ehci-q.c
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@@ -995,6 +995,12 @@ static void qh_link_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
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head->qh_next.qh = qh;
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head->hw->hw_next = dma;
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+ /*
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+ * flush qh descriptor into memory immediately,
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+ * see comments in qh_append_tds.
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+ */
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+ ehci_sync_mem();
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+
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qh_get(qh);
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qh->xacterrs = 0;
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qh->qh_state = QH_STATE_LINKED;
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@@ -1082,6 +1088,18 @@ static struct ehci_qh *qh_append_tds (
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wmb ();
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dummy->hw_token = token;
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+ /*
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+ * Writing to dma coherent buffer on ARM may
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+ * be delayed to reach memory, so HC may not see
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+ * hw_token of dummy qtd in time, which can cause
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+ * the qtd transaction to be executed very late,
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+ * and degrade performance a lot. ehci_sync_mem
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+ * is added to flush 'token' immediatelly into
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+ * memory, so that ehci can execute the transaction
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+ * ASAP.
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+ */
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+ ehci_sync_mem();
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+
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urb->hcpriv = qh_get (qh);
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}
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}
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diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
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index 989e0a8..6fb0de8 100644
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--- a/drivers/usb/host/ehci.h
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+++ b/drivers/usb/host/ehci.h
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@@ -736,6 +736,23 @@ static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x)
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#endif
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+/*
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+ * Writing to dma coherent memory on ARM may be delayed via L2
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+ * writing buffer, so introduce the helper which can flush L2 writing
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+ * buffer into memory immediately, especially used to flush ehci
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+ * descriptor to memory.
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+ */
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+#ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE
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+static inline void ehci_sync_mem()
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+{
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+ mb();
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+}
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+#else
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+static inline void ehci_sync_mem()
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+{
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+}
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+#endif
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+
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/*-------------------------------------------------------------------------*/
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#ifndef DEBUG
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--
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1.7.0.4
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@ -12,7 +12,7 @@ pkgname=('linux-omap' 'linux-headers-omap')
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# pkgname=linux-custom # Build kernel with a different name
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_kernelname=${pkgname#linux}
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_basekernel=3.1
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pkgver=${_basekernel}.4
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pkgver=${_basekernel}.5
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pkgrel=1
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arch=('arm')
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url="http://www.kernel.org/"
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@ -21,16 +21,18 @@ makedepends=('xmlto' 'docbook-xsl' 'uboot-mkimage')
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options=('!strip')
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source=("ftp://ftp.kernel.org/pub/linux/kernel/v3.x/linux-${_basekernel}.tar.bz2"
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"ftp://ftp.kernel.org/pub/linux/kernel/v3.x/patch-${pkgver}.bz2"
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"rcn-ee.diff.gz::http://rcn-ee.net/deb/sid-armhf/v3.1.4-x5/patch-3.1.4-x5.diff.gz"
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"rcn-ee.diff.gz::http://rcn-ee.net/deb/sid-armhf/v3.1.5-x6/patch-3.1.5-x6.diff.gz"
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'config'
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'change-default-console-loglevel.patch'
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'usb-add-reset-resume-quirk-for-several-webcams.patch')
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'usb-add-reset-resume-quirk-for-several-webcams.patch'
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'0006-omap4-usb-improvement.patch')
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md5sums=('8d43453f8159b2332ad410b19d86a931'
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'b8b14bdfbf76cfef8e042e7d1a385fca'
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'e646da419ce620ed8be734887ec85dd5'
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'5d72a1932baed027ef23e9c055d72621'
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'84c040bb8c4f46d351731cb0c05d9474'
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'6793994c61ee2c1804dcb0d8cefb66ca'
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'87baa7d693f6dad08dbc2b93c39bb7d4'
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'9d3c56a4b999c8bfbd4018089a62f662'
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'd00814b57448895e65fbbc800e8a58ba')
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'd00814b57448895e65fbbc800e8a58ba'
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'd4c22c6f6c8c53d595552b6285aeab79')
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build() {
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cd "${srcdir}/linux-${_basekernel}"
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@ -51,6 +53,7 @@ build() {
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# rcn-ee patchset
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patch -Np1 -i "${srcdir}/rcn-ee.diff"
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patch -Np1 -i "${srcdir}/0006-omap4-usb-improvement.patch"
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cat "${srcdir}/config" > ./.config
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@ -1,6 +1,6 @@
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#
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# Automatically generated file; DO NOT EDIT.
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# Linux/arm 3.1.4 Kernel Configuration
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# Linux/arm 3.1.5 Kernel Configuration
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#
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CONFIG_ARM=y
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CONFIG_SYS_SUPPORTS_APM_EMULATION=y
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@ -414,6 +414,7 @@ CONFIG_PL310_ERRATA_727915=y
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# CONFIG_ARM_ERRATA_754322 is not set
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# CONFIG_ARM_ERRATA_754327 is not set
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# CONFIG_ARM_ERRATA_764369 is not set
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# CONFIG_PL310_ERRATA_769419 is not set
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CONFIG_ARM_GIC=y
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#
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