[PATCH v4 00/11] drivers: cacheinfo support

[Sudeep Holla]

From: Sudeep Holla <sudeep.holla at arm.com>

This series adds a generic cacheinfo support similar to topology. The
implementation is based on x86 cacheinfo support. Currently x86, powerpc,
ia64 and s390 have their own implementations. While adding similar support
to ARM and ARM64, here is the attempt to make it generic quite similar to
topology info support. It also adds the missing ABI documentation for
the cacheinfo sysfs which is already being used.

It moves all the existing different implementations on x86, ia64, powerpc
and s390 to use the generic cacheinfo infrastructure introduced here.
These changes on non-ARM platforms are only compile tested and tested on x86.

This series also adds support for ARM and ARM64 architectures based on
the generic support.

The code can be fetched from:
 git://linux-arm.org/linux-skn cacheinfo

Changes v3->v4:
	- since userspace tools can't handle class and bus with same name,
	  removed creating new cpu class and reused existing cpu bus with
	  new cpu_device_create function
	- (no changes in the arch specific port)

Changes v2->v3:
	- Added {allocation,write}_policy instead of single attributes sysfs
	  (attributes retained on ia64 privately as it was used only on that)
	- factored out show_cpumap into separate helper in cpumask.h
	- populate cpu_{map,list} for non-DT system if they are not populated
	  by arch specific callbacks
	- removed use of sysfs *_show callback in cache_attrs_is_visible
	- all the review comments from Stephen Boyd implemented

Changes v1->v2:
	- removed custom device_{add,remove}_attrs, using is_visible callback
	  instead(suggested by GregKH)
	- arm64: changes as per MarkR review comments
	- Moved smp_call_function_single to architectures using it(arm, arm64,
	  x86) (suggested by Stephen Boyd)
	- arm (mostly changes as per RMK's review comments)
		- fixed to allow v7 + v6 build
		- l2 cache changes to remove extra structure
		- populated CTR for few StrongARM CPU's not implementing CTR

Regards,
Sudeep

[v1] https://lkml.org/lkml/2014/6/25/603
[v2] https://lkml.org/lkml/2014/7/25/467
[v3] https://lkml.org/lkml/2014/8/21/175

Cc: linux-ia64 at vger.kernel.org
Cc: linux390 at de.ibm.com
Cc: linux-s390 at vger.kernel.org
Cc: x86 at kernel.org
Cc: linuxppc-dev at lists.ozlabs.org
Cc: linux-arm-kernel at lists.infradead.org


Sudeep Holla (11):
  cpumask: factor out show_cpumap into separate helper function
  topology: replace custom attribute macros with standard DEVICE_ATTR*
  drivers: base: add cpu_device_create to support per-cpu devices
  drivers: base: support cpu cache information interface to userspace
    via sysfs
  ia64: move cacheinfo sysfs to generic cacheinfo infrastructure
  s390: move cacheinfo sysfs to generic cacheinfo infrastructure
  x86: move cacheinfo sysfs to generic cacheinfo infrastructure
  powerpc: move cacheinfo sysfs to generic cacheinfo infrastructure
  ARM64: kernel: add support for cpu cache information
  ARM: kernel: add support for cpu cache information
  ARM: kernel: add outer cache support for cacheinfo implementation

 Documentation/ABI/testing/sysfs-devices-system-cpu |  47 ++
 arch/arm/include/asm/outercache.h                  |   9 +
 arch/arm/kernel/Makefile                           |   1 +
 arch/arm/kernel/cacheinfo.c                        | 287 ++++++++
 arch/arm/mm/Kconfig                                |  13 +
 arch/arm/mm/cache-l2x0.c                           |  35 +-
 arch/arm/mm/cache-tauros2.c                        |  36 +
 arch/arm/mm/cache-xsc3l2.c                         |  17 +
 arch/arm64/kernel/Makefile                         |   2 +-
 arch/arm64/kernel/cacheinfo.c                      | 142 ++++
 arch/ia64/kernel/topology.c                        | 421 +++--------
 arch/powerpc/kernel/cacheinfo.c                    | 812 +++------------------
 arch/powerpc/kernel/cacheinfo.h                    |   8 -
 arch/powerpc/kernel/sysfs.c                        |  12 +-
 arch/s390/kernel/cache.c                           | 388 +++-------
 arch/x86/kernel/cpu/intel_cacheinfo.c              | 709 +++++-------------
 arch/x86/kernel/cpu/perf_event_amd_iommu.c         |   5 +-
 arch/x86/kernel/cpu/perf_event_amd_uncore.c        |   6 +-
 arch/x86/kernel/cpu/perf_event_intel_rapl.c        |   6 +-
 arch/x86/kernel/cpu/perf_event_intel_uncore.c      |   6 +-
 drivers/acpi/acpi_pad.c                            |   6 +-
 drivers/base/Makefile                              |   2 +-
 drivers/base/cacheinfo.c                           | 541 ++++++++++++++
 drivers/base/cpu.c                                 |  59 +-
 drivers/base/node.c                                |  14 +-
 drivers/base/topology.c                            |  71 +-
 drivers/pci/pci-sysfs.c                            |  39 +-
 include/linux/cacheinfo.h                          | 100 +++
 include/linux/cpu.h                                |   4 +
 include/linux/cpumask.h                            |  27 +
 30 files changed, 1840 insertions(+), 1985 deletions(-)
 create mode 100644 arch/arm/kernel/cacheinfo.c
 create mode 100644 arch/arm64/kernel/cacheinfo.c
 delete mode 100644 arch/powerpc/kernel/cacheinfo.h
 create mode 100644 drivers/base/cacheinfo.c
 create mode 100644 include/linux/cacheinfo.h

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1.8.3.2