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perf/x86/amd: Add branch-brs helper event for Fam19h BRS

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Add a pseudo event called branch-brs to help use the FAM Fam19h
Branch Sampling feature (BRS). BRS samples taken branches, so it is best used
when sampling on a retired taken branch event (0xc4) which is what BRS
captures.  Instead of trying to remember the event code or actual event name,
users can simply do:

$ perf record -b -e cpu/branch-brs/ -c 1000037 .....

Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220322221517.2510440-5-eranian@google.com
This commit is contained in:
Stephane Eranian 2022-03-22 15:15:08 -07:00 committed by Peter Zijlstra
parent ada543459c
commit 44175993ef
1 changed files with 15 additions and 0 deletions
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15
arch/x86/events/amd/core.c
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@ -1145,8 +1145,23 @@ static struct attribute_group group_caps_amd_brs = {
.is_visible = amd_brs_is_visible,
};
EVENT_ATTR_STR(branch-brs, amd_branch_brs,
"event=" __stringify(AMD_FAM19H_BRS_EVENT)"\n");
static struct attribute *amd_brs_events_attrs[] = {
EVENT_PTR(amd_branch_brs),
NULL,
};
static struct attribute_group group_events_amd_brs = {
.name = "events",
.attrs = amd_brs_events_attrs,
.is_visible = amd_brs_is_visible,
};
static const struct attribute_group *amd_attr_update[] = {
&group_caps_amd_brs,
&group_events_amd_brs,
NULL,
};