arm64: Fake the IminLine size on systems affected by Neoverse-N1 #1542419

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Systems affected by Neoverse-N1 #1542419 support DIC so do not need to
perform icache maintenance once new instructions are cleaned to the PoU.
For the errata workaround, the kernel hides DIC from user-space, so that
the unnecessary cache maintenance can be trapped by firmware.

To reduce the number of traps, produce a fake IminLine value based on
PAGE_SIZE.

Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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James Morse 2019-10-17 18:42:59 +01:00 • committed by Catalin Marinas

parent 05460849c3

commit ee9d90be9d

2 changed files with 9 additions and 2 deletions

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3

arch/arm64/include/asm/cache.h

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8

arch/arm64/kernel/traps.c

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