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| author |   Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> | 2022-07-13 17:56:46 -0500 |
|---|---|---|
| committer |   Joerg Roedel <jroedel@suse.de> | 2022-07-15 10:41:03 +0200 |
| commit | ae180ba42662afe2ed7620bdb863c7c6b61f6f2d (patch) | |
| tree | a509538acc3dc720e1aaa5ea00169800fc692ef8 /tools/perf/scripts/python/exported-sql-viewer.py | |
| parent | iommu/amd: Introduce global variable for storing common EFR and EFR2 (diff) | |
| download | linux-dev-ae180ba42662afe2ed7620bdb863c7c6b61f6f2d.tar.xz linux-dev-ae180ba42662afe2ed7620bdb863c7c6b61f6f2d.zip | |
iommu/amd: Process all IVHDs before enabling IOMMU features
The ACPI IVRS table can contain multiple IVHD blocks. Each block contains
information used to initialize each IOMMU instance.
Currently, init_iommu_all sequentially process IVHD block and initialize
IOMMU instance one-by-one. However, certain features require all IOMMUs
to be configured in the same way system-wide. In case certain IVHD blocks
contain inconsistent information (most likely FW bugs), the driver needs
to go through and try to revert settings on IOMMUs that have already been
configured.
A solution is to split IOMMU initialization into 3 phases:
Phase1 : Processes information of the IVRS table for all IOMMU instances.
This allow all IVHDs to be processed prior to enabling features.
Phase2 : Early feature support check on all IOMMUs (using information in
IVHD blocks.
Phase3 : Iterates through all IOMMU instances and enabling features.
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/20220713225651.20758-5-suravee.suthikulpanit@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'tools/perf/scripts/python/exported-sql-viewer.py')
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