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arm_pmu: ACPI support

Hanjun Guo linux-arm-kernel 1 version New

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Cover letter [PATCH 00/14] arm_pmu: ACPI support
Quoted 22 lines · Mark Rutland

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:

Quoted 8 lines
  $ 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.

Booted OK and 'perf list' got on Hisilicon D03:

d03-09:~ # perf list

List of pre-defined events (to be used in -e):

  branch-misses                                      [Hardware event]
  bus-cycles                                         [Hardware event]
  cache-misses                                       [Hardware event]
  cache-references                                   [Hardware event]
  cpu-cycles OR cycles                               [Hardware event]
  instructions                                       [Hardware event]
  alignment-faults                                   [Software event]
  context-switches OR cs                             [Software event]
  cpu-clock                                          [Software event]
  cpu-migrations OR migrations                       [Software event]
  dummy                                              [Software event]
  emulation-faults                                   [Software event]
  major-faults                                       [Software event]
  minor-faults                                       [Software event]
  page-faults OR faults                              [Software event]
  task-clock                                         [Software event]
  L1-dcache-load-misses                              [Hardware cache event]
  L1-dcache-loads                                    [Hardware cache event]
  L1-dcache-store-misses                             [Hardware cache event]
  L1-dcache-stores                                   [Hardware cache event]
  L1-icache-load-misses                              [Hardware cache event]
  L1-icache-loads                                    [Hardware cache event]
  branch-load-misses                                 [Hardware cache event]
  branch-loads                                       [Hardware cache event]
  dTLB-load-misses                                   [Hardware cache event]
  iTLB-load-misses                                   [Hardware cache event]
  armv8_pmuv3_0/br_mis_pred/                         [Kernel PMU event]
  armv8_pmuv3_0/br_pred/                             [Kernel PMU event]
  armv8_pmuv3_0/bus_access/                          [Kernel PMU event]
  armv8_pmuv3_0/bus_cycles/                          [Kernel PMU event]
  armv8_pmuv3_0/cid_write_retired/                   [Kernel PMU event]
  armv8_pmuv3_0/cpu_cycles/                          [Kernel PMU event]
  armv8_pmuv3_0/exc_return/                          [Kernel PMU event]
  armv8_pmuv3_0/exc_taken/                           [Kernel PMU event]
  armv8_pmuv3_0/inst_retired/                        [Kernel PMU event]
  armv8_pmuv3_0/inst_spec/                           [Kernel PMU event]
  armv8_pmuv3_0/l1d_cache/                           [Kernel PMU event]
  armv8_pmuv3_0/l1d_cache_refill/                    [Kernel PMU event]
  armv8_pmuv3_0/l1d_cache_wb/                        [Kernel PMU event]
  armv8_pmuv3_0/l1d_tlb_refill/                      [Kernel PMU event]
  armv8_pmuv3_0/l1i_cache/                           [Kernel PMU event]
  armv8_pmuv3_0/l1i_cache_refill/                    [Kernel PMU event]
  armv8_pmuv3_0/l1i_tlb_refill/                      [Kernel PMU event]
  armv8_pmuv3_0/l2d_cache/                           [Kernel PMU event]
  armv8_pmuv3_0/l2d_cache_refill/                    [Kernel PMU event]
  armv8_pmuv3_0/l2d_cache_wb/                        [Kernel PMU event]
  armv8_pmuv3_0/mem_access/                          [Kernel PMU event]
  armv8_pmuv3_0/memory_error/                        [Kernel PMU event]
  armv8_pmuv3_0/sw_incr/                             [Kernel PMU event]
  armv8_pmuv3_0/ttbr_write_retired/                  [Kernel PMU event]

rNNN [Raw hardware event descriptor]
cpu/t1=v1[,t2=v2,t3 ...]/modifier [Raw hardware event descriptor]
(see 'man perf-list' on how to encode it)

mem:<addr>[/len][:access] [Hardware breakpoint]

Try some basic perf event and it works, anything else I can try in specific?

Thanks
Hanjun

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