[PATCH 00/14] arm_pmu: ACPI support
Jeremy Linton
jeremy.linton at arm.com
Fri Mar 24 14:36:34 PDT 2017
On 03/10/2017 05:04 AM, Mark Rutland wrote:
> 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.
I've been testing these on a few machines (m400 & dual socket cavium for
starters) over the last few days. So far everything seems to be working
fine excepting the usual set of strange messages from the perf fuzzer.
Tested-by: Jeremy Linton <jlinton at arm.com>
Thanks,
>
> [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
>
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