powerpc/perf: Implement get_cpu_str()
With a file ~/.cache/pmu-events/004d0100-core.json describing Power8
PMU events we would need to run:
perf stat \
--events-file ~/.cache/pmu-events/004d0100-core.json \
-e PM_CYC sleep 1
With this get_cpu_str(), On Powerpc, we can skip the --events-file option
and run:
perf stat -e PM_CYC sleep 1
Signed-off-by: Sukadev Bhattiprolu <suka...@linux.vnet.ibm.com>
---
Changelog[v3]:
[Tobias Klauser]: Fix some changelog damage to patch.
Changelog[v2]:
[Michael Ellerman]: Use PVR instead of AUXV variables
tools/perf/arch/powerpc/util/header.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/tools/perf/arch/powerpc/util/header.c
b/tools/perf/arch/powerpc/util/header.c
index 6c1b8a7..306bf35 100644
--- a/tools/perf/arch/powerpc/util/header.c
+++ b/tools/perf/arch/powerpc/util/header.c
@@ -6,6 +6,7 @@
#include "../../util/header.h"
#include "../../util/util.h"
+#include "../../util/jevents.h"
#define mfspr(rn) ({unsigned long rval; \
asm volatile("mfspr %0," __stringify(rn) \
@@ -32,3 +33,14 @@ get_cpuid(char *buffer, size_t sz)
}
return -1;
}
+
+char *
+get_cpu_str(void)
+{
+ char *bufp;
+
+ if (asprintf(&bufp, "%.8lx-core", mfspr(SPRN_PVR)) < 0)
+ bufp = NULL;
+
+ return bufp;
+}
--
1.8.3.1
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