[PATCH v12 0/7] Enable PMUs in ACPI systems
jeremy.linton at arm.com
Tue Jan 10 09:17:45 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.
- 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
- 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.
Jeremy Linton (6):
arm64: Rename the common MADT parse routine
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 | 18 ++-
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, 400 insertions(+), 20 deletions(-)
create mode 100644 drivers/perf/arm_pmu_acpi.c
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