summaryrefslogtreecommitdiff
path: root/include/linux/io-64-nonatomic-lo-hi.h
diff options
context:
space:
mode:
authorRobin Murphy <robin.murphy@arm.com>2016-04-13 20:12:59 +0300
committerWill Deacon <will.deacon@arm.com>2016-05-03 20:23:02 +0300
commitf0cfffc48cac516e37711786227f6808491913a5 (patch)
tree889f2264c6e081e8778db9396b5a7c6adc4ebf37 /include/linux/io-64-nonatomic-lo-hi.h
parente086d912d4d78781652669618e7fb01a4d466703 (diff)
downloadlinux-f0cfffc48cac516e37711786227f6808491913a5.tar.xz
iommu/arm-smmu: Work around MMU-500 prefetch errata
MMU-500 erratum #841119 is tickled by a particular set of circumstances interacting with the next-page prefetcher. Since said prefetcher is quite dumb and actually detrimental to performance in some cases (by causing unwanted TLB evictions for non-sequential access patterns), we lose very little by turning it off, and what we gain is a guarantee that the erratum is never hit. As a bonus, the same workaround will also prevent erratum #826419 once v7 short descriptor support is implemented. CC: Catalin Marinas <catalin.marinas@arm.com> CC: Will Deacon <will.deacon@arm.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'include/linux/io-64-nonatomic-lo-hi.h')
0 files changed, 0 insertions, 0 deletions