[PATCH 00/14] arm_pmu: ACPI support
Mark Rutland
mark.rutland at arm.com
Fri Mar 10 03:04:37 PST 2017
Hi,
This series implements ACPI support in the ARM PMU code. It borrows some code
from Jeremy's series [1], but takes a different approach to probing and
association, using the usual hotplug state machine, minimising external changes
required, and simplifying the relationship with the common arm_pmu code.
The first few patches are preparatory cleanup/refactoring, with the latter half
of the series being specific to ACPI support.
The series is based on my IRQ rework patches [2]. I've pushed the whole series
out to the arm/perf/acpi branch [3] of my kernel.org repo.
Due to the innards of the hotplug callback framework, it's not entirely
safe to register a PMU in a hotplug callback. Due to this, we can only
associated hotplugged CPUs with a PMU if a matching CPU was around at
probe time. A similar restriction already applies to DT systems. We may
be able to relax this with some future work.
I've given this some testing on a Juno platform (using SPIs). To see that IRQs
are correctly associated, I've tested with the following:
$ taskset -c ${SOME_CPU_HERE} perf record \
-e armv8_pmuv3_0/cpu_cycles/ \
-e armv8_pmuv3_1/cpu_cycles/ \
cat /proc/interrupts
I've also booted with nr_cpus temporarily capped (passing maxcpus=) to test the
association logic. This has also been tested in a VM using PPIs; I do not have
access to a host machine which itself uses PPIs.
Thanks,
Mark.
[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2017-January/482397.html
[2] http://lists.infradead.org/pipermail/linux-arm-kernel/2017-March/492891.html
[3] git://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arm/perf/acpi
Mark Rutland (14):
drivers/perf: arm_pmu: remove pointless PMU disabling
drivers/perf: arm_pmu: define armpmu_init_fn
drivers/perf: arm_pmu: fold init into alloc
drivers/perf: arm_pmu: factor out pmu registration
drivers/perf: arm_pmu: simplify cpu_pmu_request_irqs()
drivers/perf: arm_pmu: handle no platform_device
drivers/perf: arm_pmu: rename irq request/free functions
drivers/perf: arm_pmu: split cpu-local irq request/free
drivers/perf: arm_pmu: move irq request/free into probe
drivers/perf: arm_pmu: split out platform device probe logic
arm64: add function to get a cpu's MADT GICC table
arm64: kill acpi_set_mailbox_entry()
drivers/perf: arm_pmu: add ACPI framework
arm64: pmuv3: use arm_pmu ACPI framework
arch/arm64/include/asm/acpi.h | 7 +-
arch/arm64/kernel/acpi_parking_protocol.c | 38 +--
arch/arm64/kernel/perf_event.c | 26 +-
arch/arm64/kernel/smp.c | 19 +-
drivers/perf/Kconfig | 4 +
drivers/perf/Makefile | 3 +-
drivers/perf/arm_pmu.c | 383 ++++++++----------------------
drivers/perf/arm_pmu_acpi.c | 237 ++++++++++++++++++
drivers/perf/arm_pmu_platform.c | 235 ++++++++++++++++++
include/linux/cpuhotplug.h | 1 +
include/linux/perf/arm_pmu.h | 22 +-
11 files changed, 626 insertions(+), 349 deletions(-)
create mode 100644 drivers/perf/arm_pmu_acpi.c
create mode 100644 drivers/perf/arm_pmu_platform.c
--
1.9.1
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