[PATCH v2 0/4] Introduce pmu-events support for HiFive Unmatched

João Mário Domingos joao.mario at tecnico.ulisboa.pt
Tue Nov 16 07:48:08 PST 2021


This series of patches introduces support for the RISC-V PMU identification and raw events matching between perf and the PMU.
The HiFive Unmatched board can now use all the counters with named events.

The work in these patches is completelly and directly dependent on the proposed SBI PMU patch [4], by Atish Patra.

This series has been tested in the HiFive Unmatched board.
OpenSBI[1] and U-Boot[2] patches are required to test it on the board, alongside with the series of patches that introduce RISC-V Perf support with the SBI PMU and sscofpmf extension [3-4].
The U-Boot fu740 dts [5] must be updated, may be fixed in future U-BOOT versions, with the events that will be tested, this comprehends changes to the riscv,raw-event-to-mhpmcounters entry. Also, an OpenSBI patch [6] proposes bitfield awareness for the DT raw-events, this will simplify, and improve, events description in the DT file. 

Here is the output of perf list and perf stat with all the available unmatched events monitoring a stress-ng trignometric stressor.

HiFive Unmatched:
=================
perf list pmu

  instructions:
    atomic_memory_retired
         [Atomic memory operation retired]
    conditional_branch_retired
         [Conditional branch retired]
    exception_taken
         [Exception taken]
    fp_addition_retired
         [Floating-point addition retired]
    fp_div_sqrt_retired
         [Floating-point division or square-root retired]
    fp_fusedmadd_retired
         [Floating-point fused multiply-add retired]
    fp_load_retired
         [Floating-point load instruction retired]
    fp_multiplication_retired
         [Floating-point multiplication retired]
    fp_store_retired
         [Floating-point store instruction retired]
    integer_arithmetic_retired
         [Integer arithmetic instruction retired]
    integer_division_retired
         [Integer division instruction retired]
    integer_load_retired
         [Integer load instruction retired]
    integer_multiplication_retired
         [Integer multiplication instruction retired]
    integer_store_retired
         [Integer store instruction retired]
    jal_instruction_retired
         [JAL instruction retired]
    jalr_instruction_retired
         [JALR instruction retired]
    other_fp_retired
         [Other floating-point instruction retired]
    system_instruction_retired
         [System instruction retired]

  memory:
    data_tlb_miss
         [Data TLB miss]
    dcache_miss_mmio_accesses
         [Data cache miss or memory-mapped I/O access]
    dcache_writeback
         [Data cache write-back]
    icache_retired
         [Instruction cache miss]
    inst_tlb_miss
         [Instruction TLB miss]
    utlb_miss
         [UTLB miss]

  microarch:
    addressgen_interlock
         [Address-generation interlock]
    branch_direction_misprediction
         [Branch direction misprediction]
    branch_target_misprediction
         [Branch/jump target misprediction]
    csr_read_interlock
         [CSR read interlock]
    dcache_dtim_busy
         [Data cache/DTIM busy]
    fp_interlock
         [Floating-point interlock]
    icache_itim_busy
         [Instruction cache/ITIM busy]
    integer_multiplication_interlock
         [Integer multiplication interlock]
    longlat_interlock
         [Long-latency interlock]
    pipe_flush_csr_write
         [Pipeline flush from CSR write]
    pipe_flush_other_event
         [Pipeline flush from other event]


perf stat -eexception_taken,integer_load_retired,integer_store_retired,atomic_memory_retired,system_instruction_retired,integer_arithmetic_retired,conditional_branch_retired,jal_instruction_retired,jalr_instruction_retired,integer_multiplication_retired,integer_division_retired,fp_load_retired,fp_store_retired,fp_addition_retired,fp_multiplication_retired,fp_fusedmadd_retired,fp_div_sqrt_retired,other_fp_retired,data_tlb_miss,dcache_miss_mmio_accesses,dcache_writeback,icache_retired,inst_tlb_miss,utlb_miss,addressgen_interlock,longlat_interlock,csr_read_interlock,icache_itim_busy,dcache_dtim_busy,branch_direction_misprediction,branch_target_misprediction,pipe_flush_csr_write,pipe_flush_other_event,integer_multiplication_interlock,fp_interlock stress-ng --cpu 1 --cpu-method trig -t 60s
stress-ng: info:  [500] setting to a 60 second run per stressor
stress-ng: info:  [500] dispatching hogs: 1 cpu
stress-ng: info:  [500] successful run completed in 60.02s (1 min, 0.02 secs)

 Performance counter stats for 'stress-ng --cpu 1 --cpu-method trig -t 60s':

            233185      exception_taken                                               (5.72%)
        5010843878      integer_load_retired                                          (5.73%)
        4437123760      integer_store_retired                                         (5.73%)
            875636      atomic_memory_retired                                         (5.72%)
         787401517      system_instruction_retired                                     (5.73%)
       58176497169      integer_arithmetic_retired                                     (5.74%)
        9689155944      conditional_branch_retired                                     (5.73%)
        2141143732      jal_instruction_retired                                       (5.72%)
         624939326      jalr_instruction_retired                                      (5.72%)
        1900272300      integer_multiplication_retired                                     (5.72%)
          29231344      integer_division_retired                                      (5.72%)
        1672274835      fp_load_retired                                               (5.73%)
         592215149      fp_store_retired                                              (5.73%)
          13592616      fp_addition_retired                                           (5.73%)
          13597374      fp_multiplication_retired                                     (5.72%)
        1331957808      fp_fusedmadd_retired                                          (5.72%)
         592410829      fp_div_sqrt_retired                                           (5.72%)
         227334317      other_fp_retired                                              (5.72%)
          95772283      data_tlb_miss                                                 (5.72%)
           6291088      dcache_miss_mmio_accesses                                     (5.72%)
             55591      dcache_writeback                                              (5.72%)
          47394708      icache_retired                                                (5.72%)
          62778259      inst_tlb_miss                                                 (5.72%)
          10159938      utlb_miss                                                     (5.72%)
         424446212      addressgen_interlock                                          (5.72%)
         849061809      longlat_interlock                                             (5.72%)
                 0      csr_read_interlock                                            (5.71%)
       16924613138      icache_itim_busy                                              (5.71%)
         204163844      dcache_dtim_busy                                              (5.70%)
         175163620      branch_direction_misprediction                                     (5.72%)
         202874026      branch_target_misprediction                                     (5.71%)
         433228932      pipe_flush_csr_write                                          (5.71%)
                 0      pipe_flush_other_event                                        (5.71%)
         429384915      integer_multiplication_interlock                                     (5.71%)
        8635530214      fp_interlock                                                  (5.71%)

      60.044837787 seconds time elapsed

      60.001431000 seconds user
       0.033660000 seconds sys


[1] https://github.com/atishp04/opensbi/tree/pmu_sscofpmf_v2 
[2] https://github.com/atishp04/u-boot/tree/hifive_unmatched_dt_pmu
[3] https://github.com/atishp04/linux/tree/riscv_pmu_v4
[4] http://lists.infradead.org/pipermail/linux-riscv/2021-October/009408.html
[5] https://github.com/atishp04/u-boot/blob/hifive_unmatched_dt_pmu/arch/riscv/dts/fu740-c000.dtsi
[6] https://patchwork.ozlabs.org/project/opensbi/patch/20211105013301.27656-1-vincent.chen@sifive.com/

Signed-off-by: João Mário Domingos <joao.mario at tecnico.ulisboa.pt>

This work was developed at INESC-ID, Instituto Superior Técnico, Universidade de Lisboa.

---
Changes in v2:
  - Fix compilation errors and warnings
  - Remove space idents
  - Correct formatting

João Mário Domingos (4):
  RISC-V: Create unique identification for SoC PMU
  RISC-V: Support CPUID for risc-v in perf
  RISC-V: Added generic pmu-events mapfile
  RISC-V: Added HiFive Unmatched PMU events

 arch/riscv/kernel/sbi.c                       |  3 +
 drivers/perf/riscv_pmu.c                      | 18 ++++
 drivers/perf/riscv_pmu_sbi.c                  | 47 ++++++++++
 tools/perf/arch/riscv/util/Build              |  1 +
 tools/perf/arch/riscv/util/header.c           | 66 +++++++++++++
 tools/perf/pmu-events/arch/riscv/mapfile.csv  | 15 +++
 .../pmu-events/arch/riscv/riscv-generic.json  | 20 ++++
 .../arch/riscv/sifive/u74/instructions.json   | 92 +++++++++++++++++++
 .../arch/riscv/sifive/u74/memory.json         | 32 +++++++
 .../arch/riscv/sifive/u74/microarch.json      | 57 ++++++++++++
 10 files changed, 351 insertions(+)
 create mode 100644 tools/perf/arch/riscv/util/header.c
 create mode 100644 tools/perf/pmu-events/arch/riscv/mapfile.csv
 create mode 100644 tools/perf/pmu-events/arch/riscv/riscv-generic.json
 create mode 100644 tools/perf/pmu-events/arch/riscv/sifive/u74/instructions.json
 create mode 100644 tools/perf/pmu-events/arch/riscv/sifive/u74/memory.json
 create mode 100644 tools/perf/pmu-events/arch/riscv/sifive/u74/microarch.json

-- 
2.17.1




More information about the linux-riscv mailing list