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| author | Joerg Roedel <joerg.roedel@amd.com> | 2011-12-07 15:01:36 +0400 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2011-12-15 14:15:29 +0400 |
| commit | 52efdb89d60a0f19949129a08af3437a7aab70be (patch) | |
| tree | f2925a431bd88e68532b205b173ee293b174df84 /drivers/iommu | |
| parent | 46277b75da1b6c57159496d536acc2e9352a7ee0 (diff) | |
| download | linux-52efdb89d60a0f19949129a08af3437a7aab70be.tar.xz | |
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 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/amd_iommu.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index d5074f428423..03944e76b700 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -3565,3 +3565,46 @@ void amd_iommu_enable_device_erratum(struct pci_dev *pdev, u32 erratum) dev_data->errata |= (1 << erratum); } EXPORT_SYMBOL(amd_iommu_enable_device_erratum); + +int amd_iommu_device_info(struct pci_dev *pdev, + struct amd_iommu_device_info *info) +{ + int max_pasids; + int pos; + + if (pdev == NULL || info == NULL) + return -EINVAL; + + if (!amd_iommu_v2_supported()) + return -EINVAL; + + memset(info, 0, sizeof(*info)); + + pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ATS); + if (pos) + info->flags |= AMD_IOMMU_DEVICE_FLAG_ATS_SUP; + + pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); + if (pos) + info->flags |= AMD_IOMMU_DEVICE_FLAG_PRI_SUP; + + pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID); + if (pos) { + int features; + + max_pasids = 1 << (9 * (amd_iommu_max_glx_val + 1)); + max_pasids = min(max_pasids, (1 << 20)); + + info->flags |= AMD_IOMMU_DEVICE_FLAG_PASID_SUP; + info->max_pasids = min(pci_max_pasids(pdev), max_pasids); + + features = pci_pasid_features(pdev); + if (features & PCI_PASID_CAP_EXEC) + info->flags |= AMD_IOMMU_DEVICE_FLAG_EXEC_SUP; + if (features & PCI_PASID_CAP_PRIV) + info->flags |= AMD_IOMMU_DEVICE_FLAG_PRIV_SUP; + } + + return 0; +} +EXPORT_SYMBOL(amd_iommu_device_info); |