[PATCH 11/20] perf/x86/intel: Setup PEBS constraints base on counter & pdist map

[Dapeng Mi]

arch-PEBS provides CPUIDs to enumerate which counters support PEBS
sampling and precise distribution PEBS sampling. Thus PEBS constraints
can be dynamically configured base on these counter and precise
distribution bitmap instead of defining them statically.

Signed-off-by: Dapeng Mi <dapeng1.mi@xxxxxxxxxxxxxxx>
---
 arch/x86/events/intel/core.c | 20 ++++++++++++++++++++
 arch/x86/events/intel/ds.c   |  1 +
 2 files changed, 21 insertions(+)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 7775e1e1c1e9..0f1be36113fa 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3728,6 +3728,7 @@ intel_get_event_constraints(struct cpu_hw_events *cpuc, int idx,
 			    struct perf_event *event)
 {
 	struct event_constraint *c1, *c2;
+	struct pmu *pmu = event->pmu;
 
 	c1 = cpuc->event_constraint[idx];
 
@@ -3754,6 +3755,25 @@ intel_get_event_constraints(struct cpu_hw_events *cpuc, int idx,
 		c2->weight = hweight64(c2->idxmsk64);
 	}
 
+	if (x86_pmu.arch_pebs && event->attr.precise_ip) {
+		u64 pebs_cntrs_mask;
+		u64 cntrs_mask;
+
+		if (event->attr.precise_ip >= 3)
+			pebs_cntrs_mask = hybrid(pmu, arch_pebs_cap).pdists;
+		else
+			pebs_cntrs_mask = hybrid(pmu, arch_pebs_cap).counters;
+
+		cntrs_mask = hybrid(pmu, fixed_cntr_mask64) << INTEL_PMC_IDX_FIXED |
+			     hybrid(pmu, cntr_mask64);
+
+		if (pebs_cntrs_mask != cntrs_mask) {
+			c2 = dyn_constraint(cpuc, c2, idx);
+			c2->idxmsk64 &= pebs_cntrs_mask;
+			c2->weight = hweight64(c2->idxmsk64);
+		}
+	}
+
 	return c2;
 }
 
diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c
index 2f2c6b7c801b..a573ce0e576a 100644
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -2941,6 +2941,7 @@ static void __init intel_arch_pebs_init(void)
 	x86_pmu.pebs_buffer_size = PEBS_BUFFER_SIZE;
 	x86_pmu.drain_pebs = intel_pmu_drain_arch_pebs;
 	x86_pmu.pebs_capable = ~0ULL;
+	x86_pmu.flags |= PMU_FL_PEBS_ALL;
 }
 
 /*
-- 
2.40.1