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perf cpuid: Introduce a platform specific cpuid compare function

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The function get_cpuid_str() is called by perf_pmu__getcpuid() and on
s390 returns a complete description of the CPU and its capabilities,
which is a comma separated list.

To map the CPU type with the value defined in the
pmu-events/arch/s390/mapfile.csv, introduce an architecture specific
cpuid compare function named strcmp_cpuid_str()

The currently used regex algorithm is defined as the weak default and
will be used if no platform specific one is defined. This matches the
current behavior.

Signed-off-by: Thomas Richter <tmricht@linux.vnet.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Link: http://lkml.kernel.org/r/20180213151419.80737-3-tmricht@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Thomas Richter
2018-02-13 16:14:18 +01:00
committed by Arnaldo Carvalho de Melo
parent c59124fa59
commit 4cb7d3ecfc
3 changed files with 48 additions and 18 deletions
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tools/perf/arch/s390/util/header.c
+18
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@@ -146,3 +146,21 @@ char *get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
zfree(&buf);
return buf;
}
/*
* Compare the cpuid string returned by get_cpuid() function
* with the name generated by the jevents file read from
* pmu-events/arch/s390/mapfile.csv.
*
* Parameter mapcpuid is the cpuid as stored in the
* pmu-events/arch/s390/mapfile.csv. This is just the type number.
* Parameter cpuid is the cpuid returned by function get_cpuid().
*/
int strcmp_cpuid_str(const char *mapcpuid, const char *cpuid)
{
char *cp = strchr(cpuid, ',');
if (cp == NULL)
return -1;
return strncmp(cp + 1, mapcpuid, strlen(mapcpuid));
}