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AMD IOMMU: fix lazy IO/TLB flushing in unmap path
author
Joerg Roedel
<joerg.roedel@amd.com>
Thu, 6 Nov 2008 13:59:05 +0000
(14:59 +0100)
committer
Joerg Roedel
<joerg.roedel@amd.com>
Thu, 6 Nov 2008 13:59:05 +0000
(14:59 +0100)
Lazy flushing needs to take care of the unmap path too which is not yet
implemented and leads to stale IO/TLB entries. This is fixed by this
patch.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
arch/x86/kernel/amd_iommu.c
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diff --git
a/arch/x86/kernel/amd_iommu.c
b/arch/x86/kernel/amd_iommu.c
index
38e88d4
..
4755bbc
100644
(file)
--- a/
arch/x86/kernel/amd_iommu.c
+++ b/
arch/x86/kernel/amd_iommu.c
@@
-526,6
+526,9
@@
static void dma_ops_free_addresses(struct dma_ops_domain *dom,
{
address >>= PAGE_SHIFT;
iommu_area_free(dom->bitmap, address, pages);
+
+ if (address + pages >= dom->next_bit)
+ dom->need_flush = true;
}
/****************************************************************************
@@
-981,8
+984,10
@@
static void __unmap_single(struct amd_iommu *iommu,
dma_ops_free_addresses(dma_dom, dma_addr, pages);
- if (amd_iommu_unmap_flush
)
+ if (amd_iommu_unmap_flush
|| dma_dom->need_flush) {
iommu_flush_pages(iommu, dma_dom->domain.id, dma_addr, size);
+ dma_dom->need_flush = false;
+ }
}
/*