diff options
| author | Madhavan Srinivasan <maddy@linux.ibm.com> | 2021-10-28 17:07:13 +0530 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-10-28 09:33:02 -0300 |
| commit | 63c12ae2f246dcdc30895ec7c980365a5133433d (patch) | |
| tree | 377b04fbe28ee674ce6dc6131098f0c4d6966907 /tools/perf/util/evsel.h | |
| parent | 6ea5d1a3e301a3d1f0364dfd481210aa6aa3cf17 (diff) | |
perf evsel: Add bitfield_swap() to handle branch_stack endian issue
The branch_stack struct has bit field definition which produces
different bit ordering for big/little endian.
Because of this, when branch_stack sample is collected in a BE system
and viewed/reported in a LE system, bit fields of the branch stack are
not presented properly.
To address this issue, a evsel__bitfield_swap_branch_stack() is defined
and introduced in evsel__parse_sample.
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Ellerman <michael@ellerman.id.au>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20211028113714.600549-1-maddy@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/evsel.h')
| -rw-r--r-- | tools/perf/util/evsel.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h index 45476a888942..846c827934de 100644 --- a/tools/perf/util/evsel.h +++ b/tools/perf/util/evsel.h @@ -484,4 +484,17 @@ struct evsel *evsel__leader(struct evsel *evsel); bool evsel__has_leader(struct evsel *evsel, struct evsel *leader); bool evsel__is_leader(struct evsel *evsel); void evsel__set_leader(struct evsel *evsel, struct evsel *leader); + +/* + * Macro to swap the bit-field postition and size. + * Used when, + * - dont need to swap the entire u64 && + * - when u64 has variable bit-field sizes && + * - when presented in a host endian which is different + * than the source endian of the perf.data file + */ +#define bitfield_swap(src, pos, size) \ + ((((src) >> (pos)) & ((1ull << (size)) - 1)) << (63 - ((pos) + (size) - 1))) + +u64 evsel__bitfield_swap_branch_flags(u64 value); #endif /* __PERF_EVSEL_H */ |