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authorRich Wiley <rwiley@nvidia.com>2021-03-24 03:28:09 +0300
committerWill Deacon <will@kernel.org>2021-03-25 13:00:23 +0300
commit20109a859a9b514eb10c22b8a14b5704ffe93897 (patch)
treecb12010828a5ed3a781337e3a5048140209353e8 /Documentation/arm64/silicon-errata.rst
parentbaa96377bc7b5aa7b8cf038db09cb99642321490 (diff)
downloadlinux-20109a859a9b514eb10c22b8a14b5704ffe93897.tar.xz
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>
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diff --git a/Documentation/arm64/silicon-errata.rst b/Documentation/arm64/silicon-errata.rst
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+++ 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 |
+----------------+-----------------+-----------------+-----------------------------+
+----------------+-----------------+-----------------+-----------------------------+