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authorSudeep Holla <sudeep.holla@arm.com>2014-09-30 14:48:25 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-11-07 11:45:00 -0800
commit246246cbde5e840012f853e27630ebb59f409486 (patch)
treec88cd0c8b3bd87ead3e110b37afdb1fa0c8fad28 /drivers/base/Makefile
parent3d52943b3a51497a777e6d7d840a38596a92cee9 (diff)
downloadlinux-246246cbde5e840012f853e27630ebb59f409486.tar.bz2
drivers: base: support cpu cache information interface to userspace via sysfs
This patch adds initial support for providing processor cache information to userspace through sysfs interface. This is based on already existing implementations(x86, ia64, s390 and powerpc) and hence the interface is intended to be fully compatible. The main purpose of this generic support is to avoid further code duplication to support new architectures and also to unify all the existing different implementations. This implementation maintains the hierarchy of cache objects which reflects the system's cache topology. Cache devices are instantiated as needed as CPUs come online. The cache information is replicated per-cpu even if they are shared. A per-cpu array of cache information maintained is used mainly for sysfs-related book keeping. It also implements the shared_cpu_map attribute, which is essential for enabling both kernel and user-space to discover the system's overall cache topology. This patch also add the missing ABI documentation for the cacheinfo sysfs interface already, which is well defined and widely used. Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Tested-by: Stephen Boyd <sboyd@codeaurora.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: linux-api@vger.kernel.org Cc: linux390@de.ibm.com Cc: linux-arm-kernel@lists.infradead.org Cc: linux-ia64@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-s390@vger.kernel.org Cc: x86@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base/Makefile')
-rw-r--r--drivers/base/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/base/Makefile b/drivers/base/Makefile
index 6922cd6850a2..e81a55ca513c 100644
--- a/drivers/base/Makefile
+++ b/drivers/base/Makefile
@@ -4,7 +4,7 @@ obj-y := component.o core.o bus.o dd.o syscore.o \
driver.o class.o platform.o \
cpu.o firmware.o init.o map.o devres.o \
attribute_container.o transport_class.o \
- topology.o container.o
+ topology.o container.o cacheinfo.o
obj-$(CONFIG_DEVTMPFS) += devtmpfs.o
obj-$(CONFIG_DMA_CMA) += dma-contiguous.o
obj-y += power/