linux-kernel - [PATCH 0/5] perf/x86/amd: Add PerfMonV2 DF ehnancements

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Date:   Thu, 19 May 2022 15:33:29 +0530
From:   Sandipan Das <sandipan.das@....com>
To:     <linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>,
        <x86@...nel.org>
CC:     <peterz@...radead.org>, <bp@...en8.de>, <acme@...nel.org>,
        <namhyung@...nel.org>, <jolsa@...nel.org>, <tglx@...utronix.de>,
        <mingo@...hat.com>, <pbonzini@...hat.com>, <jmattson@...gle.com>,
        <like.xu.linux@...il.com>, <eranian@...gle.com>,
        <ananth.narayan@....com>, <ravi.bangoria@....com>,
        <santosh.shukla@....com>, <sandipan.das@....com>
Subject: [PATCH 0/5] perf/x86/amd: Add PerfMonV2 DF ehnancements

Add support for using AMD Performance Monitoring Version 2
(PerfMonV2) features for Data Fabric (DF) events on Zen 4
processors. Utilize new CPUID leaf to detect PerfMonV2 and
determine the number of available PMCs. Also introduce the
new event encoding format and RDPMC mappings for accessing
additional DF counters.

E.g. larger metric groups which require more than 4 counters
could not be counted even on a Zen 4 platform that supports
16 DF counters. Only partial counting is possible by using
"--metric-no-group".

  $ sudo perf stat -M nps1_die_to_dram true

Before:

   Performance counter stats for 'system wide':

       <not counted>      dram_channel_data_controller_4                                     (0.00%)
       <not counted>      dram_channel_data_controller_1                                     (0.00%)
       <not counted>      dram_channel_data_controller_6                                     (0.00%)
       <not counted>      dram_channel_data_controller_3                                     (0.00%)
       <not counted>      dram_channel_data_controller_0                                     (0.00%)
       <not counted>      dram_channel_data_controller_5                                     (0.00%)
       <not counted>      dram_channel_data_controller_2                                     (0.00%)
       <not counted>      dram_channel_data_controller_7                                     (0.00%)
             886817 ns    duration_time

         0.000886817 seconds time elapsed

After:

   Performance counter stats for 'system wide':

                   0      dram_channel_data_controller_4 #      0.2 MiB  nps1_die_to_dram
                   0      dram_channel_data_controller_1
                   0      dram_channel_data_controller_6
                2838      dram_channel_data_controller_3
                   0      dram_channel_data_controller_0
                   0      dram_channel_data_controller_5
                   0      dram_channel_data_controller_2
                   0      dram_channel_data_controller_7
              896438 ns   duration_time

         0.000896438 seconds time elapsed

Sandipan Das (5):
  perf/x86/amd/uncore: Use dynamic events array
  perf/x86/amd/uncore: Use attr_update for format attributes
  perf/x86/amd/uncore: Detect available DF counters
  perf/x86/amd/uncore: Add PerfMonV2 DF event format
  perf/x86/amd/uncore: Add PerfMonV2 RDPMC assignments

 arch/x86/events/amd/uncore.c      | 146 ++++++++++++++++++++++++------
 arch/x86/include/asm/perf_event.h |  16 ++++
 2 files changed, 136 insertions(+), 26 deletions(-)

-- 
2.34.1