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authorDavid Woodhouse <David.Woodhouse@intel.com>2009-07-04 13:55:41 +0400
committerDavid Woodhouse <David.Woodhouse@intel.com>2009-07-04 13:55:41 +0400
commit40e4aa34324bff3938a900014254f88943d05e15 (patch)
tree755ff279d80c99a915328b23c91d4c81dee874a7 /drivers/pci
parent1b7bc0a1618b4de1e6f55c6d95b790f4ab6fcd9e (diff)
downloadlinux-40e4aa34324bff3938a900014254f88943d05e15.tar.xz
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.c9
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)