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| author | Sandipan Das <sandipan.das@amd.com> | 2022-08-11 17:59:50 +0530 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-08-27 00:05:42 +0200 |
| commit | 9603aa79e851c652f6da873205c92213af36b24f (patch) | |
| tree | c4c6c782322529eb17ebf3a2b4f1ebc78e1f37e6 /arch/x86/events | |
| parent | b40d0156f560932d14e3957579b6508f8d065260 (diff) | |
| download | linux-9603aa79e851c652f6da873205c92213af36b24f.tar.bz2 | |
perf/x86/amd/core: Refactor branch attributes
AMD processors that are capable of recording branches support either Branch
Sampling (BRS) or Last Branch Record (LBR). In preparation for adding Last
Branch Record Extension Version 2 (LbrExtV2) support, reuse the "branches"
capability to advertise information about both BRS and LBR but make the
"branch-brs" event exclusive to Family 19h processors that support BRS.
Signed-off-by: Sandipan Das <sandipan.das@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/ba4a4cde6db79b1c65c49834027bbdb8a915546b.1660211399.git.sandipan.das@amd.com
Diffstat (limited to 'arch/x86/events')
| -rw-r--r-- | arch/x86/events/amd/core.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c index e32a27899e11..2f524cf84528 100644 --- a/arch/x86/events/amd/core.c +++ b/arch/x86/events/amd/core.c @@ -1247,23 +1247,25 @@ static ssize_t branches_show(struct device *cdev, static DEVICE_ATTR_RO(branches); -static struct attribute *amd_pmu_brs_attrs[] = { +static struct attribute *amd_pmu_branches_attrs[] = { &dev_attr_branches.attr, NULL, }; static umode_t -amd_brs_is_visible(struct kobject *kobj, struct attribute *attr, int i) +amd_branches_is_visible(struct kobject *kobj, struct attribute *attr, int i) { return x86_pmu.lbr_nr ? attr->mode : 0; } -static struct attribute_group group_caps_amd_brs = { +static struct attribute_group group_caps_amd_branches = { .name = "caps", - .attrs = amd_pmu_brs_attrs, - .is_visible = amd_brs_is_visible, + .attrs = amd_pmu_branches_attrs, + .is_visible = amd_branches_is_visible, }; +#ifdef CONFIG_PERF_EVENTS_AMD_BRS + EVENT_ATTR_STR(branch-brs, amd_branch_brs, "event=" __stringify(AMD_FAM19H_BRS_EVENT)"\n"); @@ -1272,15 +1274,26 @@ static struct attribute *amd_brs_events_attrs[] = { NULL, }; +static umode_t +amd_brs_is_visible(struct kobject *kobj, struct attribute *attr, int i) +{ + return static_cpu_has(X86_FEATURE_BRS) && x86_pmu.lbr_nr ? + attr->mode : 0; +} + static struct attribute_group group_events_amd_brs = { .name = "events", .attrs = amd_brs_events_attrs, .is_visible = amd_brs_is_visible, }; +#endif /* CONFIG_PERF_EVENTS_AMD_BRS */ + static const struct attribute_group *amd_attr_update[] = { - &group_caps_amd_brs, + &group_caps_amd_branches, +#ifdef CONFIG_PERF_EVENTS_AMD_BRS &group_events_amd_brs, +#endif NULL, }; |