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| author | Lu Baolu <baolu.lu@linux.intel.com> | 2022-09-26 21:15:28 +0800 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2022-09-26 15:52:26 +0200 |
| commit | eb5b20114b9710d1dcd4118dbf01b081c104bbc0 (patch) | |
| tree | 0265110eb49f79476941a7db543627df51780cfd /drivers/iommu/amd/iommu.c | |
| parent | b722cb32f0a558409fa5def9aaf0b82d9b553686 (diff) | |
iommu/vt-d: Avoid unnecessary global IRTE cache invalidation
Some VT-d hardware implementations invalidate all interrupt remapping
hardware translation caches as part of SIRTP flow. The VT-d spec adds
a ESIRTPS (Enhanced Set Interrupt Remap Table Pointer Support, section
11.4.2 in VT-d spec) capability bit to indicate this.
The spec also states in 11.4.4 that hardware also performs global
invalidation on all interrupt remapping caches as part of Interrupt
Remapping Disable operation if ESIRTPS capability bit is set.
This checks the ESIRTPS capability bit and skip software global cache
invalidation if it's set.
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20220921065741.3572495-1-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/amd/iommu.c')
0 files changed, 0 insertions, 0 deletions