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authorJoerg Roedel <joerg.roedel@amd.com>2011-12-07 12:01:36 +0100
committerJoerg Roedel <joerg.roedel@amd.com>2011-12-15 11:15:29 +0100
commit52efdb89d60a0f19949129a08af3437a7aab70be (patch)
treef2925a431bd88e68532b205b173ee293b174df84 /include/linux/amd-iommu.h
parent46277b75da1b6c57159496d536acc2e9352a7ee0 (diff)
iommu/amd: Add amd_iommu_device_info() function
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>
Diffstat (limited to 'include/linux/amd-iommu.h')
-rw-r--r--include/linux/amd-iommu.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/include/linux/amd-iommu.h b/include/linux/amd-iommu.h
index 06688c42167d..c03c281ae6ee 100644
--- a/include/linux/amd-iommu.h
+++ b/include/linux/amd-iommu.h
@@ -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; }