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x86/amd-iommu: Use only per-device dma_ops 

Unfortunatly there are systems where the AMD IOMMU does not
cover all devices. This breaks with the current driver as it
initializes the global dma_ops variable. This patch limits
the AMD IOMMU to the devices listed in the IVRS table fixing
DMA for devices not covered by the IOMMU.

Cc: stable@kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2011-05-30 15:56:24 +02:00
parent 0de66d5b35
commit 27c2127a15
1 changed files with 24 additions and 2 deletions
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26
arch/x86/kernel/amd_iommu.c
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@ -30,6 +30,7 @@
#include <asm/proto.h> #include <asm/proto.h>
#include <asm/iommu.h> #include <asm/iommu.h>
#include <asm/gart.h> #include <asm/gart.h>
#include <asm/dma.h>
#include <asm/amd_iommu_proto.h> #include <asm/amd_iommu_proto.h>
#include <asm/amd_iommu_types.h> #include <asm/amd_iommu_types.h>
#include <asm/amd_iommu.h> #include <asm/amd_iommu.h>
@ -2383,6 +2384,23 @@ static struct dma_map_ops amd_iommu_dma_ops = {
.dma_supported = amd_iommu_dma_supported, .dma_supported = amd_iommu_dma_supported,
}; };
static unsigned device_dma_ops_init(void)
{
struct pci_dev *pdev = NULL;
unsigned unhandled = 0;
for_each_pci_dev(pdev) {
if (!check_device(&pdev->dev)) {
unhandled += 1;
continue;
}
pdev->dev.archdata.dma_ops = &amd_iommu_dma_ops;
}
return unhandled;
}
/* /*
* The function which clues the AMD IOMMU driver into dma_ops. * The function which clues the AMD IOMMU driver into dma_ops.
*/ */
@ -2395,7 +2413,7 @@ void __init amd_iommu_init_api(void)
int __init amd_iommu_init_dma_ops(void) int __init amd_iommu_init_dma_ops(void)
{ {
struct amd_iommu *iommu; struct amd_iommu *iommu;
int ret; int ret, unhandled;
/* /*
* first allocate a default protection domain for every IOMMU we * first allocate a default protection domain for every IOMMU we
@ -2421,7 +2439,11 @@ int __init amd_iommu_init_dma_ops(void)
swiotlb = 0; swiotlb = 0;
/* Make the driver finally visible to the drivers */ /* Make the driver finally visible to the drivers */
dma_ops = &amd_iommu_dma_ops; unhandled = device_dma_ops_init();
if (unhandled && max_pfn > MAX_DMA32_PFN) {
/* There are unhandled devices - initialize swiotlb for them */
swiotlb = 1;
}
amd_iommu_stats_init(); amd_iommu_stats_init();