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| author | Lorenzo Pieralisi <lpieralisi@kernel.org> | 2023-07-04 18:50:34 +0300 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2023-07-11 11:04:31 +0300 |
| commit | 6fe5c68ee6a1aae0ef291a56001e7888de547fa2 (patch) | |
| tree | d1ff279888b87f9f0a5c9771f4be3accab0eca38 /Documentation | |
| parent | 567f67acac94e7bbc4cb4b71ff9773555d02609a (diff) | |
| download | linux-6fe5c68ee6a1aae0ef291a56001e7888de547fa2.tar.xz | |
irqchip/gic-v3: Workaround for GIC-700 erratum 2941627
GIC700 erratum 2941627 may cause GIC-700 missing SPIs wake
requests when SPIs are deactivated while targeting a
sleeping CPU - ie a CPU for which the redistributor:
GICR_WAKER.ProcessorSleep == 1
This runtime situation can happen if an SPI that has been
activated on a core is retargeted to a different core, it
becomes pending and the target core subsequently enters a
power state quiescing the respective redistributor.
When this situation is hit, the de-activation carried out
on the core that activated the SPI (through either ICC_EOIR1_EL1
or ICC_DIR_EL1 register writes) does not trigger a wake
requests for the sleeping GIC redistributor even if the SPI
is pending.
Work around the erratum by de-activating the SPI using the
redistributor GICD_ICACTIVER register if the runtime
conditions require it (ie the IRQ was retargeted between
activation and de-activation).
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230704155034.148262-1-lpieralisi@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 d6430ade349d..0d55d58c645c 100644 --- a/Documentation/arm64/silicon-errata.rst +++ b/Documentation/arm64/silicon-errata.rst @@ -141,6 +141,9 @@ stable kernels. | ARM | MMU-500 | #841119,826419 | N/A | +----------------+-----------------+-----------------+-----------------------------+ +----------------+-----------------+-----------------+-----------------------------+ +| ARM | GIC-700 | #2941627 | ARM64_ERRATUM_2941627 | ++----------------+-----------------+-----------------+-----------------------------+ ++----------------+-----------------+-----------------+-----------------------------+ | Broadcom | Brahma-B53 | N/A | ARM64_ERRATUM_845719 | +----------------+-----------------+-----------------+-----------------------------+ | Broadcom | Brahma-B53 | N/A | ARM64_ERRATUM_843419 | |