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| author |   Robin Murphy <robin.murphy@arm.com> | 2016-04-13 18:12:59 +0100 |
|---|---|---|
| committer |   Will Deacon <will.deacon@arm.com> | 2016-05-03 18:23:02 +0100 |
| commit | f0cfffc48cac516e37711786227f6808491913a5 (patch) | |
| tree | 889f2264c6e081e8778db9396b5a7c6adc4ebf37 /include/linux/io-64-nonatomic-hi-lo.h | |
| parent | iommu/arm-smmu: Convert ThunderX workaround to new method (diff) | |
| download | linux-dev-f0cfffc48cac516e37711786227f6808491913a5.tar.xz linux-dev-f0cfffc48cac516e37711786227f6808491913a5.zip | |
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-hi-lo.h')
0 files changed, 0 insertions, 0 deletions