On 06/23/2017 10:52 AM, Florian Fainelli wrote: > 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
Any comments on this? Thank you. > > 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 > -- Florian
