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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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18
tools/perf/arch/s390/util/header.c
View file

@ -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));
}

1
tools/perf/util/header.h
View file

@ -174,4 +174,5 @@ int write_padded(struct feat_fd *fd, const void *bf,
int get_cpuid(char *buffer, size_t sz);
char *get_cpuid_str(struct perf_pmu *pmu __maybe_unused);
int strcmp_cpuid_str(const char *s1, const char *s2);
#endif /* __PERF_HEADER_H */

47
tools/perf/util/pmu.c
View file

@ -576,6 +576,34 @@ char * __weak get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
return NULL;
}
/* Return zero when the cpuid from the mapfile.csv matches the
* cpuid string generated on this platform.
* Otherwise return non-zero.
*/
int __weak strcmp_cpuid_str(const char *mapcpuid, const char *cpuid)
{
regex_t re;
regmatch_t pmatch[1];
int match;
if (regcomp(&re, mapcpuid, REG_EXTENDED) != 0) {
/* Warn unable to generate match particular string. */
pr_info("Invalid regular expression %s\n", mapcpuid);
return 1;
}
match = !regexec(&re, cpuid, 1, pmatch, 0);
regfree(&re);
if (match) {
size_t match_len = (pmatch[0].rm_eo - pmatch[0].rm_so);
/* Verify the entire string matched. */
if (match_len == strlen(cpuid))
return 0;
}
return 1;
}
static char *perf_pmu__getcpuid(struct perf_pmu *pmu)
{
char *cpuid;
@ -610,31 +638,14 @@ struct pmu_events_map *perf_pmu__find_map(struct perf_pmu *pmu)
i = 0;
for (;;) {
regex_t re;
regmatch_t pmatch[1];
int match;
map = &pmu_events_map[i++];
if (!map->table) {
map = NULL;
break;
}
if (regcomp(&re, map->cpuid, REG_EXTENDED) != 0) {
/* Warn unable to generate match particular string. */
pr_info("Invalid regular expression %s\n", map->cpuid);
if (!strcmp_cpuid_str(map->cpuid, cpuid))
break;
}
match = !regexec(&re, cpuid, 1, pmatch, 0);
regfree(&re);
if (match) {
size_t match_len = (pmatch[0].rm_eo - pmatch[0].rm_so);
/* Verify the entire string matched. */
if (match_len == strlen(cpuid))
break;
}
}
free(cpuid);
return map;