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x86, gart: Make sure GART does not map physmem above 1TB

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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: <stable@kernel.org>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Link: http://lkml.kernel.org/r/1303134346-5805-5-git-send-email-joerg.roedel@amd.com
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Joerg Roedel 2011-04-18 15:45:46 +02:00 committed by H. Peter Anvin
parent c34151a742
commit 665d3e2af8
1 changed files with 8 additions and 1 deletions
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9
arch/x86/kernel/pci-gart_64.c
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@ -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;