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| author |   Rich Wiley <rwiley@nvidia.com> | 2021-03-23 17:28:09 -0700 |
|---|---|---|
| committer |   Will Deacon <will@kernel.org> | 2021-03-25 10:00:23 +0000 |
| commit | 20109a859a9b514eb10c22b8a14b5704ffe93897 (patch) | |
| tree | cb12010828a5ed3a781337e3a5048140209353e8 /Documentation | |
| parent | arm64/process.c: fix Wmissing-prototypes build warnings (diff) | |
| download | linux-dev-20109a859a9b514eb10c22b8a14b5704ffe93897.tar.xz linux-dev-20109a859a9b514eb10c22b8a14b5704ffe93897.zip | |
arm64: kernel: disable CNP on Carmel
On NVIDIA Carmel cores, CNP behaves differently than it does on standard
ARM cores. On Carmel, if two cores have CNP enabled and share an L2 TLB
entry created by core0 for a specific ASID, a non-shareable TLBI from
core1 may still see the shared entry. On standard ARM cores, that TLBI
will invalidate the shared entry as well.
This causes issues with patchsets that attempt to do local TLBIs based
on cpumasks instead of broadcast TLBIs. Avoid these issues by disabling
CNP support for NVIDIA Carmel cores.
Signed-off-by: Rich Wiley <rwiley@nvidia.com>
Link: https://lore.kernel.org/r/20210324002809.30271-1-rwiley@nvidia.com
[will: Fix pre-existing whitespace issue]
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/arm64/silicon-errata.rst | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/arm64/silicon-errata.rst b/Documentation/arm64/silicon-errata.rst index 719510247292..d410a47ffa57 100644 --- a/Documentation/arm64/silicon-errata.rst +++ b/Documentation/arm64/silicon-errata.rst @@ -130,6 +130,9 @@ stable kernels. | Marvell | ARM-MMU-500 | #582743 | N/A | +----------------+-----------------+-----------------+-----------------------------+ +----------------+-----------------+-----------------+-----------------------------+ +| NVIDIA | Carmel Core | N/A | NVIDIA_CARMEL_CNP_ERRATUM | ++----------------+-----------------+-----------------+-----------------------------+ ++----------------+-----------------+-----------------+-----------------------------+ | Freescale/NXP | LS2080A/LS1043A | A-008585 | FSL_ERRATUM_A008585 | +----------------+-----------------+-----------------+-----------------------------+ +----------------+-----------------+-----------------+-----------------------------+ |