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authorCatalin Marinas <catalin.marinas@arm.com>2010-09-16 17:57:17 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-09-17 10:16:52 +0100
commit1a8e41cd672f894bbd74874eac601e6cedf838fb (patch)
tree6e38d880b05897fb97d698a670732b1d474e7e5d /arch/arm
parenta672e99b129e286df2e2697a1b603d82321117f3 (diff)
downloadop-kernel-dev-1a8e41cd672f894bbd74874eac601e6cedf838fb.zip
op-kernel-dev-1a8e41cd672f894bbd74874eac601e6cedf838fb.tar.gz
ARM: 6395/1: VExpress: Set bit 22 in the PL310 (cache controller) AuxCtlr register
Clearing bit 22 in the PL310 Auxiliary Control register (shared attribute override enable) has the side effect of transforming Normal Shared Non-cacheable reads into Cacheable no-allocate reads. Coherent DMA buffers in Linux always have a Cacheable alias via the kernel linear mapping and the processor can speculatively load cache lines into the PL310 controller. With bit 22 cleared, Non-cacheable reads would unexpectedly hit such cache lines leading to buffer corruption. Cc: Nicolas Pitre <nicolas.pitre@linaro.org> Cc: <stable@kernel.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/mach-vexpress/ct-ca9x4.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/mach-vexpress/ct-ca9x4.c b/arch/arm/mach-vexpress/ct-ca9x4.c
index 577df6c..1c9c13e 100644
--- a/arch/arm/mach-vexpress/ct-ca9x4.c
+++ b/arch/arm/mach-vexpress/ct-ca9x4.c
@@ -227,7 +227,7 @@ static void ct_ca9x4_init(void)
int i;
#ifdef CONFIG_CACHE_L2X0
- l2x0_init(MMIO_P2V(CT_CA9X4_L2CC), 0x00000000, 0xfe0fffff);
+ l2x0_init(MMIO_P2V(CT_CA9X4_L2CC), 0x00400000, 0xfe0fffff);
#endif
clkdev_add_table(lookups, ARRAY_SIZE(lookups));
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