Commit-ID: 665d3e2af83c8fbd149534db8f57d82fa6fa6753 Gitweb: http://git.kernel.org/tip/665d3e2af83c8fbd149534db8f57d82fa6fa6753 Author: Joerg Roedel <[email protected]> AuthorDate: Mon, 18 Apr 2011 15:45:46 +0200 Committer: H. Peter Anvin <[email protected]> CommitDate: Mon, 18 Apr 2011 09:26:49 -0700
x86, gart: Make sure GART does not map physmem above 1TB The GART can only map physical memory below 1TB. Make sure the gart driver in the kernel does not try to map memory above 1TB. Cc: <[email protected]> Signed-off-by: Joerg Roedel <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: H. Peter Anvin <[email protected]> --- arch/x86/kernel/pci-gart_64.c | 9 ++++++++- 1 files changed, 8 insertions(+), 1 deletions(-) diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c index 82ada01..b117efd 100644 --- a/arch/x86/kernel/pci-gart_64.c +++ b/arch/x86/kernel/pci-gart_64.c @@ -81,6 +81,9 @@ static u32 gart_unmapped_entry; #define AGPEXTERN #endif +/* GART can only remap to physical addresses < 1TB */ +#define GART_MAX_PHYS_ADDR (1ULL << 40) + /* backdoor interface to AGP driver */ AGPEXTERN int agp_memory_reserved; AGPEXTERN __u32 *agp_gatt_table; @@ -212,9 +215,13 @@ static dma_addr_t dma_map_area(struct device *dev, dma_addr_t phys_mem, size_t size, int dir, unsigned long align_mask) { unsigned long npages = iommu_num_pages(phys_mem, size, PAGE_SIZE); - unsigned long iommu_page = alloc_iommu(dev, npages, align_mask); + unsigned long iommu_page; int i; + if (unlikely(phys_mem + size > GART_MAX_PHYS_ADDR)) + return bad_dma_addr; + + iommu_page = alloc_iommu(dev, npages, align_mask); if (iommu_page == -1) { if (!nonforced_iommu(dev, phys_mem, size)) return phys_mem; _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
