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authorDavid Woodhouse <dwmw2@infradead.org>2009-02-13 23:18:03 +0000
committerLinus Torvalds <torvalds@linux-foundation.org>2009-02-17 14:02:57 -0800
commitca77fde8e62cecb2c0769052228d15b901367af8 (patch)
treefc237837eebc41da62ac67458e19e400ac4006b5 /kernel
parent1a88b5364b535edaa321d70a566e358390ff0872 (diff)
Fix Intel IOMMU write-buffer flushing
This is the cause of the DMA faults and disk corruption that people have been seeing. Some chipsets neglect to report the RWBF "capability" -- the flag which says that we need to flush the chipset write-buffer when changing the DMA page tables, to ensure that the change is visible to the IOMMU. Override that bit on the affected chipsets, and everything is happy again. Thanks to Chris and Bhavesh and others for helping to debug. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Tested-by: Chris Wright <chrisw@sous-sol.org> Reviewed-by: Bhavesh Davda <bhavesh@vmware.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions