AMD IOMMU: fix lazy IO/TLB flushing in unmap path
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>
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 38e88d4..4755bbc 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -526,6 +526,9 @@
{
address >>= PAGE_SHIFT;
iommu_area_free(dom->bitmap, address, pages);
+
+ if (address + pages >= dom->next_bit)
+ dom->need_flush = true;
}
/****************************************************************************
@@ -981,8 +984,10 @@
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;
+ }
}
/*