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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>
This commit is contained in:
David Woodhouse 2009-07-04 10:55:41 +01:00
parent 1b7bc0a161
commit 40e4aa3432
1 changed files with 7 additions and 2 deletions
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9
drivers/pci/intel-iommu.c
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@ -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)