tree 9160c7bab4a6faea031f53586ee65a4acdb6f08c
parent 1b568dfec3124e03e1d6000d5d311b11492682ed
author James Morse <james.morse@arm.com> 1587746323 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1588170669 +0200

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

[ Upstream commit ee9d90be9ddace01b7fb126567e4b539fbe1f82f ]

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>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>