Patrick Daly 3b6916b4d4 ANDROID: iommu/io-pgtable-arm: Add IOMMU_CACHE_ICACHE_OCACHE_NWA ...

Allow io-coherent devices to use a inner writeback read/write allocate,
outer writeback read allocate, no-write allocate cache policy. The outer
cache policy affects the behavior of a system cache, at least on qcom
boards which have one.

The rational follows that of IOMMU_SYS_CACHE_ONLY_NWA. Certain gpu
usecases perform better when using a no-write allocate policy.

Rename the IOMMU_SYS_CACHE_* flags to better reflect that they are not
exclusive with IOMMU_CACHE.

Bug: 191811876
Change-Id: Ic91616a148f39fead008a5b87a54ffd781fee734
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>

2021-06-30 08:29:33 +00:00

34 KiB

Raw Blame History

View Raw