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| author | Robert Richter <rrichter@cavium.com> | 2015-09-21 22:58:35 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2015-09-29 10:10:53 +0200 |
| commit | 6d4e11c5e2e8cd54a035ba395bf8ccfa7e22cfd8 (patch) | |
| tree | 4a75f95e66d6a3a370ca9027373d5c1cbe856f2e /arch/arm64/Kconfig | |
| parent | 30f2136346cab91e1ffd9ee6370d76809f20487a (diff) | |
| download | lwn-6d4e11c5e2e8cd54a035ba395bf8ccfa7e22cfd8.tar.gz lwn-6d4e11c5e2e8cd54a035ba395bf8ccfa7e22cfd8.zip | |
irqchip/gicv3: Workaround for Cavium ThunderX erratum 23154
This patch implements Cavium ThunderX erratum 23154.
The gicv3 of ThunderX requires a modified version for reading the IAR
status to ensure data synchronization. Since this is in the fast-path
and called with each interrupt, runtime patching is used using jump
label patching for smallest overhead (no-op). This is the same
technique as used for tracepoints.
Signed-off-by: Robert Richter <rrichter@cavium.com>
Reviewed-by: Marc Zygnier <marc.zyngier@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Tirumalesh Chalamarla <tchalamarla@cavium.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Will Deacon <will.deacon@arm.com>
Link: http://lkml.kernel.org/r/1442869119-1814-3-git-send-email-rric@kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 07d1811aa03f..490df449377d 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -348,6 +348,16 @@ config ARM64_ERRATUM_843419 If unsure, say Y. +config CAVIUM_ERRATUM_23154 + bool "Cavium erratum 23154: Access to ICC_IAR1_EL1 is not sync'ed" + default y + help + The gicv3 of ThunderX requires a modified version for + reading the IAR status to ensure data synchronization + (access to icc_iar1_el1 is not sync'ed before and after). + + If unsure, say Y. + endmenu |