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| author | Robin Murphy <robin.murphy@arm.com> | 2023-05-10 16:38:43 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2023-06-08 21:58:12 +0100 |
| commit | f322e8af35c7f23a8c08b595c38d6c855b2d836f (patch) | |
| tree | 1a91a9fdb93761f0c8e29f693ff22337bf847c3e /Documentation/arm64/silicon-errata.rst | |
| parent | 44c026a73be8038f03dbdeef028b642880cf1511 (diff) | |
| download | lwn-f322e8af35c7f23a8c08b595c38d6c855b2d836f.tar.gz lwn-f322e8af35c7f23a8c08b595c38d6c855b2d836f.zip | |
iommu/arm-smmu-v3: Work around MMU-600 erratum 1076982
MMU-600 versions prior to r1p0 fail to correctly generate a WFE wakeup
event when the command queue transitions fom full to non-full. We can
easily work around this by simply hiding the SEV capability such that we
fall back to polling for space in the queue - since MMU-600 implements
MSIs we wouldn't expect to need SEV for sync completion either, so this
should have little to no impact.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Link: https://lore.kernel.org/r/08adbe3d01024d8382a478325f73b56851f76e49.1683731256.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'Documentation/arm64/silicon-errata.rst')
| -rw-r--r-- | Documentation/arm64/silicon-errata.rst | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/arm64/silicon-errata.rst b/Documentation/arm64/silicon-errata.rst index 9e311bc43e05..951d8d42c248 100644 --- a/Documentation/arm64/silicon-errata.rst +++ b/Documentation/arm64/silicon-errata.rst @@ -140,6 +140,8 @@ stable kernels. +----------------+-----------------+-----------------+-----------------------------+ | ARM | MMU-500 | #841119,826419 | N/A | +----------------+-----------------+-----------------+-----------------------------+ +| ARM | MMU-600 | #1076982 | N/A | ++----------------+-----------------+-----------------+-----------------------------+ +----------------+-----------------+-----------------+-----------------------------+ | Broadcom | Brahma-B53 | N/A | ARM64_ERRATUM_845719 | +----------------+-----------------+-----------------+-----------------------------+ |