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iommu/amd: Add amd_iommu_device_info() function

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This function can be used to find out which features
necessary for IOMMUv2 usage are available on a given device.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2011-12-07 12:01:36 +01:00
parent 46277b75da
commit 52efdb89d6
2 changed files with 69 additions and 0 deletions
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26
include/linux/amd-iommu.h
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@ -119,6 +119,32 @@ typedef int (*amd_iommu_invalid_ppr_cb)(struct pci_dev *pdev,
extern int amd_iommu_set_invalid_ppr_cb(struct pci_dev *pdev,
amd_iommu_invalid_ppr_cb cb);
/**
* amd_iommu_device_info() - Get information about IOMMUv2 support of a
* PCI device
* @pdev: PCI device to query information from
* @info: A pointer to an amd_iommu_device_info structure which will contain
* the information about the PCI device
*
* Returns 0 on success, negative value on error
*/
#define AMD_IOMMU_DEVICE_FLAG_ATS_SUP 0x1 /* ATS feature supported */
#define AMD_IOMMU_DEVICE_FLAG_PRI_SUP 0x2 /* PRI feature supported */
#define AMD_IOMMU_DEVICE_FLAG_PASID_SUP 0x4 /* PASID context supported */
#define AMD_IOMMU_DEVICE_FLAG_EXEC_SUP 0x8 /* Device may request execution
on memory pages */
#define AMD_IOMMU_DEVICE_FLAG_PRIV_SUP 0x10 /* Device may request
super-user privileges */
struct amd_iommu_device_info {
int max_pasids;
u32 flags;
};
extern int amd_iommu_device_info(struct pci_dev *pdev,
struct amd_iommu_device_info *info);
#else
static inline int amd_iommu_detect(void) { return -ENODEV; }