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From 74f949e5e8a95cc6d9e8eae42768ba5e814a8eb0 Mon Sep 17 00:00:00 2001
From: Stephane Eranian <eranian@google.com>
Date: Tue, 22 Mar 2022 15:15:08 -0700
Subject: [PATCH 61/86] perf/x86/amd: Add branch-brs helper event for Fam19h
BRS
commit 44175993efbae04e8b2d7f7795ff512c3a726db0 upstream
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
Signed-off-by: Zhaolong Zhang <zhaolong.zhang@windriver.com>
---
arch/x86/events/amd/core.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c
index c7ac70d8ed9a..f7bce8364fe4 100644
--- a/arch/x86/events/amd/core.c
+++ b/arch/x86/events/amd/core.c
@@ -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,
};
--
2.37.3
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