[PATCH v14 0/6] Enable PMUs in ACPI systems

Jeremy Linton jeremy.linton at arm.com
Mon Jan 23 14:32:39 PST 2017

This patch expands and reworks the patches published by Mark Salter
in order to clean up a few of the previous review comments, as well as
add support for newer CPUs and big/little configurations.

- drop rename patch requested for v6
- Shuffle couple include lines from one patch to a later

- Correct int/bool conversion bug in pmu_acpi_init()
  created during v10 code shuffle

- Rebase to 4.10
- Removed lock in the hotplug path.

- Add is_smp() check to read_specific_cpuid() for arch/arm. Update
  c_show() and various routines in arm_pmu_acpi() to use the macro.
- Moved the duplicate "generic" pmu detection code into its own
  patch and hoist it into arm_pmu_device_probe() so it works
  for DT based systems as well.

- Rebase to 4.9
- Rework the arm_perf_start_cpu changes to support the 4.9 hotplug
- Remove the call to acpi_register_gsi() from the cpu online code path.
  Instead the GSI's are registered during the initcall. This changes
  the error handling a bit because we now try to clean up the
  previously registered GSIs in a couple important places. This
  was also a result of the rebase.
- Dropped the MIDR partnumber usage, its no longer necessary to
  differentiate by only the partnum, so this helps to clarify the code
  a bit. 
- Shuffle some code around and rename a few variables.
- Added a few comments to hopefully clarify some questions people have
  previously had about unused MADT entries, skipping processing cores
  with MIDR=0, etc.

- Add/cleanup an additional hotplug patch I've had sitting around. This
  patch brings the ACPI PMU mostly on par with the DT functionality with
  respect to having CPUs offline during boot. This should help clarify
  some of the code structuring.
- Cleanup the list of PMU types early if we fail to allocate memory for an
  additional pmu type.

- Rebase to 4.8rc4
- Assorted minor comment/hunk placement/etc tweaks per Punit Agrawal

- Rebase to 4.8rc3
- Remove cpu affinity sysfs entry. While providing a CPU mask for
  ARMv8 PMU's is really helpful in big/little environments, reworking
  the PMU code to support the cpumask attribute for !arm64 PMUs is out
  of the scope of this patch set.
- Fix CPU miscount problem where an alloc failure followed by successfully
  allocating the structure can result in under counting the CPUs associated
  with the PMU. This bug was created in v6 with the conversion to a linked
- Remove initial platform device creation code by Mark Salter, and re-squash
  multiple platform device creation code together with helper routines.
  Other minor tweakage.

- Added cpu affinity sysfs entry
- Converted pmu_types array, to linked list
- Restrict use of the armv8_pmu_probe_table to ACPI systems
- Rename MADT parsing routines in smp.c
- Convert sysfs PMU name to use index rather than partnum
- Remove pr_devel statements
- Other Minor cleanups
- Add Partial Ack-by Will Deacon

- Remove list of CPU types for ACPI systems. We now match a generic
  event list, and use the PMCIED[01] to select events which exist on
  the given PMU. This avoids the need to update the kernel every time
  a new CPU is released.
- Update the maintainers list to include the new file.

- Correct build issues with ARM (!ARM64) kernels.
- Add ThunderX to list of PMU types.

Jeremy Linton (5):
  arm: arm64: Add routine to determine cpuid of other cpus
  arm: arm64: pmu: Assign platform PMU CPU affinity
  arm64: pmu: Detect multiple generic PMUs and append counter
  arm64: pmu: Detect and enable multiple PMUs in an ACPI system
  arm: pmu: Add PMU definitions for cores not initially online

Mark Salter (1):
  arm64: pmu: Cache PMU interrupt numbers from MADT parse

 arch/arm/include/asm/cputype.h   |   4 +
 arch/arm/kernel/setup.c          |   2 +-
 arch/arm64/include/asm/cputype.h |   3 +
 arch/arm64/kernel/perf_event.c   |   2 +-
 arch/arm64/kernel/smp.c          |   5 +
 drivers/perf/Kconfig             |   4 +
 drivers/perf/Makefile            |   1 +
 drivers/perf/arm_pmu.c           | 103 +++++++++++++--
 drivers/perf/arm_pmu_acpi.c      | 271 +++++++++++++++++++++++++++++++++++++++
 include/linux/perf/arm_pmu.h     |  12 ++
 10 files changed, 393 insertions(+), 14 deletions(-)
 create mode 100644 drivers/perf/arm_pmu_acpi.c


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