[PATCH v2 0/7] ARM: Broadcom Brahma-B15 readahead cache support

From: Florian Fainelli
Date: Fri Jun 23 2017 - 13:53:12 EST

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

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