diff options
| author | Shameer Kolothum <skolothumtho@nvidia.com> | 2026-03-17 11:16:02 +0000 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2026-03-17 14:05:05 +0100 |
| commit | a82efb8747d1b8a7c0a377dc79c2aac204eae788 (patch) | |
| tree | 46f63527866bb33f32162815abe249111cc7d2f6 /include/linux | |
| parent | d6c65b0fd6218bd21ed0be7a8d3218e8f6dc91de (diff) | |
iommu: Add device ATS supported capability
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_SUPPORTED capability to allow IOMMU drivers
to report the effective ATS decision for a device.
When this capability is true for a device, ATS may be enabled for that
device, but it does not imply that ATS is currently enabled.
A subsequent patch will extend iommufd to expose the effective ATS
status to userspace.
Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Shameer Kolothum <skolothumtho@nvidia.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/iommu.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 7ca648c01336..a904821ed169 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -272,6 +272,8 @@ enum iommu_cap { */ IOMMU_CAP_DEFERRED_FLUSH, IOMMU_CAP_DIRTY_TRACKING, /* IOMMU supports dirty tracking */ + /* ATS is supported and may be enabled for this device */ + IOMMU_CAP_PCI_ATS_SUPPORTED, }; /* These are the possible reserved region types */ |