diff options
| author | Joerg Roedel <joerg.roedel@amd.com> | 2010-05-31 15:05:20 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-07-05 11:15:50 -0700 |
| commit | 0ac5ad9b26e8879728141ad76b56a8b9cc72cd98 (patch) | |
| tree | 8926affd13bf978ee46964166a5149bf92e0db6b | |
| parent | 77b0b9457672d4cb8a3a5e32438737dd2b8bad79 (diff) | |
x86/amd-iommu: Fall back to GART if initialization fails
commit d7f0776975334070a93370ae048fda0c31a91c38 upstream.
This patch implements a fallback to the GART IOMMU if this
is possible and the AMD IOMMU initialization failed.
Otherwise the fallback would be nommu which is very
problematic on machines with more than 4GB of memory or
swiotlb which hurts io-performance.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | arch/x86/kernel/amd_iommu.c | 4 | ||||
| -rw-r--r-- | arch/x86/kernel/amd_iommu_init.c | 9 |
2 files changed, 9 insertions, 4 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index 2e775169bdf..bbef34ed4d0 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -2256,10 +2256,6 @@ int __init amd_iommu_init_dma_ops(void) iommu_detected = 1; swiotlb = 0; -#ifdef CONFIG_GART_IOMMU - gart_iommu_aperture_disabled = 1; - gart_iommu_aperture = 0; -#endif /* Make the driver finally visible to the drivers */ dma_ops = &amd_iommu_dma_ops; diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c index fdce84d4945..86a5a117807 100644 --- a/arch/x86/kernel/amd_iommu_init.c +++ b/arch/x86/kernel/amd_iommu_init.c @@ -1340,6 +1340,15 @@ free: free_unity_maps(); +#ifdef CONFIG_GART_IOMMU + /* + * We failed to initialize the AMD IOMMU - try fallback to GART + * if possible. + */ + gart_iommu_init(); + +#endif + goto out; } |