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SubjectRe: [PATCH v2 0/7] ARM: Broadcom Brahma-B15 readahead cache support
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On 07/14/2017 03:11 PM, Florian Fainelli wrote:
> 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.

Should I just go a ahead and queue these changes in Russell's patch tracker?

>
>>
>> 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

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