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| author | Simon Horman <horms@verge.net.au> | 2012-09-28 02:12:45 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-21 09:27:58 -0700 |
| commit | 90e4ed1b7de612e4ed18029e61134ab2fea6233e (patch) | |
| tree | 3e796aa4bb46f3f647b19685305a99fdae7e566c | |
| parent | 023f18fee60cd9ef86c8299dd9debccad1f93351 (diff) | |
| download | lwn-90e4ed1b7de612e4ed18029e61134ab2fea6233e.tar.gz lwn-90e4ed1b7de612e4ed18029e61134ab2fea6233e.zip | |
ARM: 7541/1: Add ARM ERRATA 775420 workaround
commit 7253b85cc62d6ff84143d96fe6cd54f73736f4d7 upstream.
arm: Add ARM ERRATA 775420 workaround
Workaround for the 775420 Cortex-A9 (r2p2, r2p6,r2p8,r2p10,r3p0) erratum.
In case a date cache maintenance operation aborts with MMU exception, it
might cause the processor to deadlock. This workaround puts DSB before
executing ISB if an abort may occur on cache maintenance.
Based on work by Kouei Abe and feedback from Catalin Marinas.
Signed-off-by: Kouei Abe <kouei.abe.cp@rms.renesas.com>
[ horms@verge.net.au: Changed to implementation
suggested by catalin.marinas@arm.com ]
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/arm/Kconfig | 10 | ||||
| -rw-r--r-- | arch/arm/mm/cache-v7.S | 3 |
2 files changed, 13 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 352322a67651..e14ae1141429 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1405,6 +1405,16 @@ config PL310_ERRATA_769419 on systems with an outer cache, the store buffer is drained explicitly. +config ARM_ERRATA_775420 + bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock" + depends on CPU_V7 + help + This option enables the workaround for the 775420 Cortex-A9 (r2p2, + r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance + operation aborts with MMU exception, it might cause the processor + to deadlock. This workaround puts DSB before executing ISB if + an abort may occur on cache maintenance. + endmenu source "arch/arm/common/Kconfig" diff --git a/arch/arm/mm/cache-v7.S b/arch/arm/mm/cache-v7.S index a655d3da386d..82ab2c5b4ac4 100644 --- a/arch/arm/mm/cache-v7.S +++ b/arch/arm/mm/cache-v7.S @@ -211,6 +211,9 @@ ENTRY(v7_coherent_user_range) * isn't mapped, just try the next page. */ 9001: +#ifdef CONFIG_ARM_ERRATA_775420 + dsb +#endif mov r12, r12, lsr #12 mov r12, r12, lsl #12 add r12, r12, #4096 |