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iommu/vt-d: Add device_def_domain_type() helper

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This helper returns the default domain type that the device
requires.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2019-05-25 13:41:26 +08:00 committed by Joerg Roedel
parent d8190dc638
commit f273a453b7
1 changed files with 27 additions and 13 deletions
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40
drivers/iommu/intel-iommu.c
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@ -2930,29 +2930,37 @@ static bool device_is_rmrr_locked(struct device *dev)
return true;
}
static int iommu_should_identity_map(struct device *dev, int startup)
/*
* Return the required default domain type for a specific device.
*
* @dev: the device in query
* @startup: true if this is during early boot
*
* Returns:
* - IOMMU_DOMAIN_DMA: device requires a dynamic mapping domain
* - IOMMU_DOMAIN_IDENTITY: device requires an identical mapping domain
* - 0: both identity and dynamic domains work for this device
*/
static int device_def_domain_type(struct device *dev, int startup)
{
if (dev_is_pci(dev)) {
struct pci_dev *pdev = to_pci_dev(dev);
if (device_is_rmrr_locked(dev))
return 0;
return IOMMU_DOMAIN_DMA;
/*
* Prevent any device marked as untrusted from getting
* placed into the statically identity mapping domain.
*/
if (pdev->untrusted)
return 0;
return IOMMU_DOMAIN_DMA;
if ((iommu_identity_mapping & IDENTMAP_AZALIA) && IS_AZALIA(pdev))
return 1;
return IOMMU_DOMAIN_IDENTITY;
if ((iommu_identity_mapping & IDENTMAP_GFX) && IS_GFX_DEVICE(pdev))
return 1;
if (!(iommu_identity_mapping & IDENTMAP_ALL))
return 0;
return IOMMU_DOMAIN_IDENTITY;
/*
* We want to start off with all devices in the 1:1 domain, and
@ -2973,14 +2981,14 @@ static int iommu_should_identity_map(struct device *dev, int startup)
*/
if (!pci_is_pcie(pdev)) {
if (!pci_is_root_bus(pdev->bus))
return 0;
return IOMMU_DOMAIN_DMA;
if (pdev->class >> 8 == PCI_CLASS_BRIDGE_PCI)
return 0;
return IOMMU_DOMAIN_DMA;
} else if (pci_pcie_type(pdev) == PCI_EXP_TYPE_PCI_BRIDGE)
return 0;
return IOMMU_DOMAIN_DMA;
} else {
if (device_has_rmrr(dev))
return 0;
return IOMMU_DOMAIN_DMA;
}
/*
@ -3002,7 +3010,13 @@ static int iommu_should_identity_map(struct device *dev, int startup)
return dma_mask >= dma_get_required_mask(dev);
}
return 1;
return (iommu_identity_mapping & IDENTMAP_ALL) ?
IOMMU_DOMAIN_IDENTITY : 0;
}
static inline int iommu_should_identity_map(struct device *dev, int startup)
{
return device_def_domain_type(dev, startup) == IOMMU_DOMAIN_IDENTITY;
}
static int __init dev_prepare_static_identity_mapping(struct device *dev, int hw)