From: Sudeep Holla <sudeep.holla@xxxxxxx> Hi, This series adds a generic cacheinfo support similar to topology. The implementation is based on x86 cacheinfo support. Currently x86 and powerpc have their own implementations. While adding similar support to ARM, here is the attempt to make it generic quite similar to topology info support. This series also adds support for ARM architecture based on the generic support. ARM uses device tree for cache hierarcy as there is no architectural way of getting it. On non-DT platforms, first level caches are per-cpu while higher level caches are assumed system-wide. I can move the x86 and powerpc implementations to use this generic one based on the feedback. However I have few open questions: 1. Do we need to populate cache data on hotplug path or just once during the boot on all cpus will suffice ? Hotplug path seems more appropriate for me but based on my understanding(I may be wrong here) of x86 code, I placed it in boot patch for now. I can change it. 2. I see some custom/arch specific sysfs entries(e.g. AMD L3 cache partitioning feature). How do we deal with that ? I had posted previous version[1] without generic implementation(ARM specific) Regards, Sudeep [1] https://lkml.org/lkml/2013/9/18/340 Sudeep Holla (3): drivers: base: support cpu cache information interface to userspace via sysfs ARM: kernel: add support for cpu cache information ARM: kernel: add outer cache support for cacheinfo implementation arch/arm/include/asm/cacheinfo.h | 7 + arch/arm/include/asm/outercache.h | 13 ++ arch/arm/kernel/Makefile | 1 + arch/arm/kernel/cacheinfo.c | 438 ++++++++++++++++++++++++++++++++++++++ arch/arm/kernel/setup.c | 2 + arch/arm/mm/Kconfig | 13 ++ arch/arm/mm/cache-l2x0.c | 14 ++ arch/arm/mm/cache-tauros2.c | 35 +++ arch/arm/mm/cache-xsc3l2.c | 15 ++ drivers/base/Makefile | 2 +- drivers/base/cacheinfo.c | 296 ++++++++++++++++++++++++++ include/linux/cacheinfo.h | 43 ++++ 12 files changed, 878 insertions(+), 1 deletion(-) create mode 100644 arch/arm/include/asm/cacheinfo.h create mode 100644 arch/arm/kernel/cacheinfo.c create mode 100644 drivers/base/cacheinfo.c create mode 100644 include/linux/cacheinfo.h -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
