Messages in this thread | | | From | Florian Fainelli <> | Subject | [PATCH v2 0/7] ARM: Broadcom Brahma-B15 readahead cache support | Date | Fri, 23 Jun 2017 10:52:20 -0700 |
| |
Hi all,
This patch series adds support for the Broadcom Brahma-B15 readahead cache. I submitted that patch series a couple of years ago, and then slept on it so here is another stab at it.
Note that we did not implement this cache as a version of an outer cache for several reasons:
- we initially thought we needed to intercept flush_icache_all and flush_kern_cache_louis but upon further inspection we convinced ourselves this is no longer needed, still, flush_cache_all() needs special handling here and needs to be wrapped around
- the outer cache does not allow differentiating a DMA transfer direction this is a readahead cache, so it does not participate in writes, flushing it during reads *and* writes kills the performance completely
- finally, most operations that outer_cache cares about are on MVA, which is transparent to the readahead cache here
Changes in v2:
- clarify that the read-ahead caches does invalidates on writes (IOW) based on Russell's feedback
Florian Fainelli (7): ARM: v7: allow setting different cache functions ARM: Add Broadcom Brahma-B15 readahead cache support ARM: Hook B15 readahead cache functions based on processor ARM: B15: Add CPU hotplug awareness ARM: B15: Add suspend/resume hooks ARM: B15: Register reboot notifier for KEXEC MAINTAINERS: Update brcmstb entries to cover B15 code
MAINTAINERS | 2 + arch/arm/include/asm/glue-cache.h | 4 + arch/arm/include/asm/hardware/cache-b15-rac.h | 10 + arch/arm/mm/Kconfig | 8 + arch/arm/mm/Makefile | 1 + arch/arm/mm/cache-b15-rac.c | 360 ++++++++++++++++++++++++++ arch/arm/mm/cache-v7.S | 21 ++ arch/arm/mm/proc-v7.S | 6 +- include/linux/cpuhotplug.h | 2 + 9 files changed, 411 insertions(+), 3 deletions(-) create mode 100644 arch/arm/include/asm/hardware/cache-b15-rac.h create mode 100644 arch/arm/mm/cache-b15-rac.c
-- 2.9.3
| |