diff options
Diffstat (limited to 'tools/perf/arch')
| -rw-r--r-- | tools/perf/arch/powerpc/util/header.c | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/tools/perf/arch/powerpc/util/header.c b/tools/perf/arch/powerpc/util/header.c index 6b00efd53638..251cdbf58a4d 100644 --- a/tools/perf/arch/powerpc/util/header.c +++ b/tools/perf/arch/powerpc/util/header.c @@ -10,6 +10,18 @@ #include "utils_header.h" #include "metricgroup.h" #include <api/fs/fs.h> +#include <sys/auxv.h> + +static bool is_compat_mode(void) +{ + u64 base_platform = getauxval(AT_BASE_PLATFORM); + u64 platform = getauxval(AT_PLATFORM); + + if (!strcmp((char *)platform, (char *)base_platform)) + return false; + + return true; +} int get_cpuid(char *buffer, size_t sz) @@ -33,8 +45,26 @@ char * get_cpuid_str(struct perf_pmu *pmu __maybe_unused) { char *bufp; + unsigned long pvr; + + /* + * IBM Power System supports compatible mode. That is + * Nth generation platform can support previous generation + * OS in a mode called compatibile mode. For ex. LPAR can be + * booted in a Power9 mode when the system is a Power10. + * + * In the compatible mode, care must be taken when generating + * PVR value. When read, PVR will be of the AT_BASE_PLATFORM + * To support generic events, return 0x00ffffff as pvr when + * booted in compat mode. Based on this pvr value, json will + * pick events from pmu-events/arch/powerpc/compat + */ + if (!is_compat_mode()) + pvr = mfspr(SPRN_PVR); + else + pvr = 0x00ffffff; - if (asprintf(&bufp, "0x%.8lx", mfspr(SPRN_PVR)) < 0) + if (asprintf(&bufp, "0x%.8lx", pvr) < 0) bufp = NULL; return bufp; |