Messages in this thread Patch in this message | | | From | Andi Kleen <> | Subject | [PATCH] [42/50] iommu/amd: Don't use MSI address range for DMA addresses | Date | Thu, 28 Jul 2011 16:44:47 -0700 (PDT) |
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2.6.35-longterm review patch. If anyone has any objections, please let me know.
------------------ From: Joerg Roedel <joerg.roedel@amd.com>
[ upstream commit 17f5b569e09cfa3488eaa663cbf9feada2e789f5 ]
Reserve the MSI address range in the address allocator so that MSI addresses are not handed out as dma handles.
Cc: stable@kernel.org Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
Index: linux-2.6.35.y/arch/x86/kernel/amd_iommu.c =================================================================== --- linux-2.6.35.y.orig/arch/x86/kernel/amd_iommu.c +++ linux-2.6.35.y/arch/x86/kernel/amd_iommu.c @@ -25,6 +25,7 @@ #include <linux/dma-mapping.h> #include <linux/iommu-helper.h> #include <linux/iommu.h> +#include <asm/msidef.h> #include <asm/proto.h> #include <asm/iommu.h> #include <asm/gart.h> @@ -1048,7 +1049,7 @@ static int alloc_new_range(struct dma_op { int index = dma_dom->aperture_size >> APERTURE_RANGE_SHIFT; struct amd_iommu *iommu; - unsigned long i; + unsigned long i, old_size; #ifdef CONFIG_IOMMU_STRESS populate = false; @@ -1084,8 +1085,21 @@ static int alloc_new_range(struct dma_op } } + old_size = dma_dom->aperture_size; dma_dom->aperture_size += APERTURE_RANGE_SIZE; + /* Reserve address range used for MSI messages */ + if (old_size < MSI_ADDR_BASE_LO && + dma_dom->aperture_size > MSI_ADDR_BASE_LO) { + unsigned long spage; + int pages; + + pages = iommu_num_pages(MSI_ADDR_BASE_LO, 0x10000, PAGE_SIZE); + spage = MSI_ADDR_BASE_LO >> PAGE_SHIFT; + + dma_ops_reserve_addresses(dma_dom, spage, pages); + } + /* Intialize the exclusion range if necessary */ for_each_iommu(iommu) { if (iommu->exclusion_start &&
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