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perf stat: Suppress warning when using cpum_cf events on s390

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Running command perf stat -vv -e cpu_cycles -C0 -- true
displays this warning:

 Attempting to add event pmu 'cpum_cf' with 'cpu_cycles,'
 that may result in non-fatal errors

Make the PMU cpum_cf selectable and avoid this warning.
While at it also fix this warning for PMUs pai_crypto and pai_ext.

Output before:

 #  ./perf stat -vv -e cpu_cycles -C0 -- true
 Using CPUID IBM,3931,704,A01,3.7,002f
 Attempting to add event pmu 'cpum_cf' with 'cpu_cycles,'
   that may result in non-fatal errors
 After aliases, add event pmu 'cpum_cf' with 'event,'
   that may result in non-fatal errors
   cpu_cycles -> cpum_cf/event=0/
 Control descriptor is not initialized
 ------------------------------------------------------------
 perf_event_attr:
  type                             10
  size                             128
  config                           0x1001
  sample_type                      IDENTIFIER
  read_format                      TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
  disabled                         1
  inherit                          1
  exclude_guest                    1
 ------------------------------------------------------------
 sys_perf_event_open: pid -1  cpu 0  group_fd -1  flags 0x8 = 3
 cpu_cycles: 0: 290434 2479172 2479172:
 cpu_cycles: 290434 2479172 2479172

 Performance counter stats for 'CPU(s) 0':

           290,434      cpu_cycles

       0.002465617 seconds time elapsed
 #

Now the warning "Attempting to add event pmu 'cpum_cf' ..."
does not show up anymore.

Output after:
 # ./perf stat -vv -e cpu_cycles -C0 -- true
 Using CPUID IBM,3931,704,A01,3.7,002f
 After aliases, add event pmu 'cpum_cf' with 'event,'
   that may result in non-fatal errors
   cpu_cycles -> cpum_cf/event=0/
 Control descriptor is not initialized
 ....

 Performance counter stats for 'CPU(s) 0':

           357,023      cpu_cycles

       0.002454995 seconds time elapsed
 #

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Sumanth Korikkar <sumanthk@linux.ibm.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Link: https://lore.kernel.org/r/20230316074946.41110-1-tmricht@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Thomas Richter 2023-03-16 08:49:46 +01:00 • committed by Arnaldo Carvalho de Melo
parent 7f8d3fbe09
commit 51ea4cb96f
2 changed files with 24 additions and 0 deletions
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1
tools/perf/arch/s390/util/Build
View file

@ -6,5 +6,6 @@ perf-$(CONFIG_DWARF) += dwarf-regs.o
perf-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
perf-y += machine.o
perf-y += pmu.o
perf-$(CONFIG_AUXTRACE) += auxtrace.o

23
tools/perf/arch/s390/util/pmu.c Normal file
View file

@ -0,0 +1,23 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright IBM Corp. 2023
* Author(s): Thomas Richter <tmricht@linux.ibm.com>
*/
#include <string.h>
#include "../../../util/pmu.h"
#define S390_PMUPAI_CRYPTO "pai_crypto"
#define S390_PMUPAI_EXT "pai_ext"
#define S390_PMUCPUM_CF "cpum_cf"
struct perf_event_attr *perf_pmu__get_default_config(struct perf_pmu *pmu)
{
if (!strcmp(pmu->name, S390_PMUPAI_CRYPTO) ||
!strcmp(pmu->name, S390_PMUPAI_EXT) ||
!strcmp(pmu->name, S390_PMUCPUM_CF))
pmu->selectable = true;
return NULL;
}