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| author | David Woodhouse <David.Woodhouse@intel.com> | 2009-07-04 10:55:41 +0100 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2009-07-04 10:55:41 +0100 |
| commit | 40e4aa34324bff3938a900014254f88943d05e15 (patch) | |
| tree | 755ff279d80c99a915328b23c91d4c81dee874a7 /drivers/pci | |
| parent | 1b7bc0a1618b4de1e6f55c6d95b790f4ab6fcd9e (diff) | |
| download | linux-40e4aa34324bff3938a900014254f88943d05e15.tar.gz linux-40e4aa34324bff3938a900014254f88943d05e15.tar.bz2 linux-40e4aa34324bff3938a900014254f88943d05e15.zip | |
intel-iommu: Add iommu_should_identity_map() function
We do this twice, and it's about to get more complicated. This makes the
code slightly clearer about what it's doing, too.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/intel-iommu.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c index 73a5c71dd37d..ae5ccdf8b19f 100644 --- a/drivers/pci/intel-iommu.c +++ b/drivers/pci/intel-iommu.c @@ -2442,6 +2442,11 @@ static int iommu_dummy(struct pci_dev *pdev) return pdev->dev.archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO; } +static int iommu_should_identity_map(struct pci_dev *pdev) +{ + return pdev->dma_mask > DMA_BIT_MASK(32); +} + /* Check if the pdev needs to go through non-identity map and unmap process.*/ static int iommu_no_mapping(struct pci_dev *pdev) { @@ -2455,7 +2460,7 @@ static int iommu_no_mapping(struct pci_dev *pdev) found = identity_mapping(pdev); if (found) { - if (pdev->dma_mask > DMA_BIT_MASK(32)) + if (iommu_should_identity_map(pdev)) return 1; else { /* @@ -2472,7 +2477,7 @@ static int iommu_no_mapping(struct pci_dev *pdev) * In case of a detached 64 bit DMA device from vm, the device * is put into si_domain for identity mapping. */ - if (pdev->dma_mask > DMA_BIT_MASK(32)) { + if (iommu_should_identity_map(pdev)) { int ret; ret = domain_add_dev_info(si_domain, pdev); if (ret) |