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charset="utf-8" PCIe ATS may be disabled by platform firmware, root complex limitations, or kernel policy even when a device advertises the ATS capability in its PCI configuration space. Add a new IOMMU_CAP_PCI_ATS_NOT_SUPPORTED capability to allow IOMMU drivers to report the effective ATS decision for a device. When this capability is returned true for a device, ATS is not supported and not used for that device, regardless of the presence of the PCI ATS capability. A subsequent patch will extend iommufd to expose the effective ATS status to userspace. Suggested-by: Jason Gunthorpe Signed-off-by: Shameer Kolothum Reviewed-by: Jason Gunthorpe --- include/linux/iommu.h | 2 ++ drivers/iommu/amd/iommu.c | 6 ++++++ drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 3 +++ drivers/iommu/intel/iommu.c | 2 ++ 4 files changed, 13 insertions(+) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 54b8b48c762e..f40ecdc5d761 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -271,6 +271,8 @@ enum iommu_cap { */ IOMMU_CAP_DEFERRED_FLUSH, IOMMU_CAP_DIRTY_TRACKING, /* IOMMU supports dirty tracking */ + /* ATS is not supported and not used on this device */ + IOMMU_CAP_PCI_ATS_NOT_SUPPORTED, }; =20 /* These are the possible reserved region types */ diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index 81c4d7733872..aa4399b6b6db 100644 --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -2985,6 +2985,12 @@ static bool amd_iommu_capable(struct device *dev, en= um iommu_cap cap) =20 return amd_iommu_hd_support(iommu); } + case IOMMU_CAP_PCI_ATS_NOT_SUPPORTED: { + struct iommu_dev_data *dev_data =3D dev_iommu_priv_get(dev); + + return !(amd_iommu_iotlb_sup && + (dev_data->flags & AMD_IOMMU_DEVICE_FLAG_ATS_SUP)); + } default: break; } diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/ar= m/arm-smmu-v3/arm-smmu-v3.c index 4d00d796f078..c20d2454ca14 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -107,6 +107,7 @@ static const char * const event_class_str[] =3D { }; =20 static int arm_smmu_alloc_cd_tables(struct arm_smmu_master *master); +static bool arm_smmu_ats_supported(struct arm_smmu_master *master); =20 static void parse_driver_options(struct arm_smmu_device *smmu) { @@ -2494,6 +2495,8 @@ static bool arm_smmu_capable(struct device *dev, enum= iommu_cap cap) return true; case IOMMU_CAP_DIRTY_TRACKING: return arm_smmu_dbm_capable(master->smmu); + case IOMMU_CAP_PCI_ATS_NOT_SUPPORTED: + return !arm_smmu_ats_supported(master); 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charset="utf-8" If the IOMMU driver reports that ATS is not supported for a device, set the IOMMU_HW_CAP_PCI_ATS_NOT_SUPPORTED flag in the returned hardware capabilities. When this flag is set, ATS is not supported and not used for the device. Signed-off-by: Shameer Kolothum Reviewed-by: Jason Gunthorpe Reviewed-by: Samiullah Khawaja --- include/uapi/linux/iommufd.h | 3 +++ drivers/iommu/iommufd/device.c | 3 +++ 2 files changed, 6 insertions(+) diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h index 1dafbc552d37..d85a2d3e1b40 100644 --- a/include/uapi/linux/iommufd.h +++ b/include/uapi/linux/iommufd.h @@ -695,11 +695,14 @@ enum iommu_hw_info_type { * @IOMMU_HW_CAP_PCI_PASID_PRIV: Privileged Mode Supported, user ignores it * when the struct * iommu_hw_info::out_max_pasid_log2 is zero. + * @IOMMU_HW_CAP_PCI_ATS_NOT_SUPPORTED: ATS is not supported and not used = on + * this device. */ enum iommufd_hw_capabilities { IOMMU_HW_CAP_DIRTY_TRACKING =3D 1 << 0, IOMMU_HW_CAP_PCI_PASID_EXEC =3D 1 << 1, IOMMU_HW_CAP_PCI_PASID_PRIV =3D 1 << 2, + IOMMU_HW_CAP_PCI_ATS_NOT_SUPPORTED =3D 1 << 3, }; =20 /** diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c index 344d620cdecc..2e98818806c0 100644 --- a/drivers/iommu/iommufd/device.c +++ b/drivers/iommu/iommufd/device.c @@ -1624,6 +1624,9 @@ int iommufd_get_hw_info(struct iommufd_ucmd *ucmd) if (device_iommu_capable(idev->dev, IOMMU_CAP_DIRTY_TRACKING)) cmd->out_capabilities |=3D IOMMU_HW_CAP_DIRTY_TRACKING; =20 + if (device_iommu_capable(idev->dev, IOMMU_CAP_PCI_ATS_NOT_SUPPORTED)) + cmd->out_capabilities |=3D IOMMU_HW_CAP_PCI_ATS_NOT_SUPPORTED; + cmd->out_max_pasid_log2 =3D 0; /* * Currently, all iommu drivers enable PASID in the probe_device() --=20 2.43.0