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| author | Joerg Roedel <joerg.roedel@amd.com> | 2008-12-02 20:16:03 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-12-02 20:25:52 +0100 |
| commit | dcb7731a185efbf3d800618d874af99895df5afb (patch) | |
| tree | 8730ff765213c91ba65da2520fa0e82178509f0e /arch | |
| parent | 50cec5c51c18301ff60262fdbe920f4a907c9d81 (diff) | |
| download | blackbird-op-linux-dcb7731a185efbf3d800618d874af99895df5afb.tar.gz blackbird-op-linux-dcb7731a185efbf3d800618d874af99895df5afb.zip | |
x86: fix broken flushing in GART nofullflush path
Impact: remove stale IOTLB entries
In the non-default nofullflush case the GART is only flushed when
next_bit wraps around. But it can happen that an unmap operation unmaps
memory which is behind the current next_bit location. If these addresses
are reused it may result in stale GART IO/TLB entries. Fix this by
setting the GART next_bit always behind an unmapped location.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/pci-gart_64.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c index a42b02b4df68..ba7ad83e20a8 100644 --- a/arch/x86/kernel/pci-gart_64.c +++ b/arch/x86/kernel/pci-gart_64.c @@ -123,6 +123,8 @@ static void free_iommu(unsigned long offset, int size) spin_lock_irqsave(&iommu_bitmap_lock, flags); iommu_area_free(iommu_gart_bitmap, offset, size); + if (offset >= next_bit) + next_bit = offset + size; spin_unlock_irqrestore(&iommu_bitmap_lock, flags); } |
