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perf: x86/core: Add interface to query perfmon_event_map[] directly 

Currently, we have [intel|knc|p4|p6]_perfmon_event_map on the Intel
platforms and amd_[f17h]_perfmon_event_map on the AMD platforms.

Early clumsy KVM code or other potential perf_event users may have
hard-coded these perfmon_maps (e.g., arch/x86/kvm/svm/pmu.c), so
it would not make sense to program a common hardware event based
on the generic "enum perf_hw_id" once the two tables do not match.

Let's provide an interface for callers outside the perf subsystem to get
the counter config based on the perfmon_event_map currently in use,
and it also helps to save bytes.

Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Like Xu <likexu@tencent.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Message-Id: <20220518132512.37864-10-likexu@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Like Xu 2022-05-18 21:25:10 +08:00 committed by Paolo Bonzini
parent 02791a5c36
commit dc852ff5bb
2 changed files with 17 additions and 0 deletions
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11
arch/x86/events/core.c
View File

@ -3005,3 +3005,14 @@ void perf_get_x86_pmu_capability(struct x86_pmu_capability *cap)
cap->pebs_ept = x86_pmu.pebs_ept;
}
EXPORT_SYMBOL_GPL(perf_get_x86_pmu_capability);
u64 perf_get_hw_event_config(int hw_event)
{
int max = x86_pmu.max_events;
if (hw_event < max)
return x86_pmu.event_map(array_index_nospec(hw_event, max));
return 0;
}
EXPORT_SYMBOL_GPL(perf_get_hw_event_config);

6
arch/x86/include/asm/perf_event.h
View File

@ -505,6 +505,7 @@ struct x86_pmu_lbr {
};
extern void perf_get_x86_pmu_capability(struct x86_pmu_capability *cap);
extern u64 perf_get_hw_event_config(int hw_event);
extern void perf_check_microcode(void);
extern void perf_clear_dirty_counters(void);
extern int x86_perf_rdpmc_index(struct perf_event *event);
@ -514,6 +515,11 @@ static inline void perf_get_x86_pmu_capability(struct x86_pmu_capability *cap)
memset(cap, 0, sizeof(*cap));
}
static inline u64 perf_get_hw_event_config(int hw_event)
{
return 0;
}
static inline void perf_events_lapic_init(void) { }
static inline void perf_check_microcode(void) { }
#endif