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AMD IOMMU: fix lazy IO/TLB flushing in unmap path

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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>
This commit is contained in:
Joerg Roedel 2008-11-06 14:59:05 +01:00
parent ae9b940364
commit 80be308dfa
1 changed files with 6 additions and 1 deletions
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7
arch/x86/kernel/amd_iommu.c
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@ -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;
}
}
/*