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authorLinu Cherian <lcherian@marvell.com>2022-03-07 20:00:14 +0530
committerWill Deacon <will@kernel.org>2022-03-07 21:45:02 +0000
commit24a147bcef8ca039cb75d6d4b68c7cc339b11178 (patch)
tree37b2fa86a84d07b495566edff338bd873b0d4c0c /Documentation/arm64
parentdfd42facf1e4ada021b939b4e19c935dcdd55566 (diff)
downloadlinux-24a147bcef8ca039cb75d6d4b68c7cc339b11178.tar.bz2
irqchip/gic-v3: Workaround Marvell erratum 38545 when reading IAR
When a IAR register read races with a GIC interrupt RELEASE event, GIC-CPU interface could wrongly return a valid INTID to the CPU for an interrupt that is already released(non activated) instead of 0x3ff. As a side effect, an interrupt handler could run twice, once with interrupt priority and then with idle priority. As a workaround, gic_read_iar is updated so that it will return a valid interrupt ID only if there is a change in the active priority list after the IAR read on all the affected Silicons. Since there are silicon variants where both 23154 and 38545 are applicable, workaround for erratum 23154 has been extended to address both of them. Signed-off-by: Linu Cherian <lcherian@marvell.com> Reviewed-by: Marc Zyngier <maz@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/20220307143014.22758-1-lcherian@marvell.com Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'Documentation/arm64')
-rw-r--r--Documentation/arm64/silicon-errata.rst2
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/arm64/silicon-errata.rst b/Documentation/arm64/silicon-errata.rst
index ea281dd75517..466cb9e89047 100644
--- a/Documentation/arm64/silicon-errata.rst
+++ b/Documentation/arm64/silicon-errata.rst
@@ -136,7 +136,7 @@ stable kernels.
+----------------+-----------------+-----------------+-----------------------------+
| Cavium | ThunderX ITS | #23144 | CAVIUM_ERRATUM_23144 |
+----------------+-----------------+-----------------+-----------------------------+
-| Cavium | ThunderX GICv3 | #23154 | CAVIUM_ERRATUM_23154 |
+| Cavium | ThunderX GICv3 | #23154,38545 | CAVIUM_ERRATUM_23154 |
+----------------+-----------------+-----------------+-----------------------------+
| Cavium | ThunderX GICv3 | #38539 | N/A |
+----------------+-----------------+-----------------+-----------------------------+