From: Florian Fainelli <f.fainelli@gmail.com> To: linux-arm-kernel@lists.infradead.org Cc: Florian Fainelli <f.fainelli@gmail.com>, Russell King <linux@armlinux.org.uk>, bcm-kernel-feedback-list@broadcom.com (maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE), Jonathan Austin <jonathan.austin@arm.com>, Vladimir Murzin <vladimir.murzin@arm.com>, Thomas Gleixner <tglx@linutronix.de>, Zhaoxiu Zeng <zhaoxiu.zeng@gmail.com>, Mark Rutland <mark.rutland@arm.com>, Nicolas Pitre <nico@linaro.org>, Sebastian Andrzej Siewior <bigeasy@linutronix.de>, Anna-Maria Gleixner <anna-maria@linutronix.de>, linux-kernel@vger.kernel.org (open list), will.deacon@arm.com Subject: [PATCH 0/7] ARM: Broadcom Brahma-B15 readahead cache support Date: Wed, 18 Jan 2017 12:29:19 -0800 [thread overview] Message-ID: <20170118202927.28740-1-f.fainelli@gmail.com> (raw) 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 wrap 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 - finally, most operations that outer_cache cares about are on MVA, which is transparent to the readahead cache here Florian Fainelli (8): 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 + 10 files changed, 411 insertions(+), 4 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
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From: f.fainelli@gmail.com (Florian Fainelli) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 0/7] ARM: Broadcom Brahma-B15 readahead cache support Date: Wed, 18 Jan 2017 12:29:19 -0800 [thread overview] Message-ID: <20170118202927.28740-1-f.fainelli@gmail.com> (raw) 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 wrap 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 - finally, most operations that outer_cache cares about are on MVA, which is transparent to the readahead cache here Florian Fainelli (8): 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 + 10 files changed, 411 insertions(+), 4 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
next reply other threads:[~2017-01-18 20:30 UTC|newest] Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-01-18 20:29 Florian Fainelli [this message] 2017-01-18 20:29 ` [PATCH 0/7] ARM: Broadcom Brahma-B15 readahead cache support Florian Fainelli 2017-01-18 20:29 ` [PATCH 1/7] ARM: v7: allow setting different cache functions Florian Fainelli 2017-01-18 20:29 ` Florian Fainelli 2017-01-18 20:29 ` [PATCH 2/7] ARM: Add Broadcom Brahma-B15 readahead cache support Florian Fainelli 2017-01-18 20:29 ` Florian Fainelli 2017-01-18 22:56 ` Russell King - ARM Linux 2017-01-18 22:56 ` Russell King - ARM Linux 2017-01-19 0:18 ` Florian Fainelli 2017-01-19 0:18 ` Florian Fainelli 2017-01-18 20:29 ` [PATCH 3/7] ARM: Hook B15 readahead cache functions based on processor Florian Fainelli 2017-01-18 20:29 ` Florian Fainelli 2017-01-18 20:29 ` [PATCH 4/7] ARM: B15: Add CPU hotplug awareness Florian Fainelli 2017-01-18 20:29 ` Florian Fainelli 2017-01-18 20:29 ` [PATCH 5/7] ARM: B15: Add suspend/resume hooks Florian Fainelli 2017-01-18 20:29 ` Florian Fainelli 2017-01-18 20:29 ` [PATCH 6/7] ARM: B15: Register reboot notifier for KEXEC Florian Fainelli 2017-01-18 20:29 ` Florian Fainelli 2017-01-18 20:29 ` [PATCH 7/7] MAINTAINERS: Update brcmstb entries to cover B15 code Florian Fainelli 2017-01-18 20:29 ` Florian Fainelli 2017-01-18 20:29 ` [PATCH 8/8] ARM: smp: Remove CPU: shutdown notice Florian Fainelli 2017-01-18 20:29 ` Florian Fainelli
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