From: Dapeng Mi <dapeng1.mi@linux.intel.com>
Date: Wed, 29 Oct 2025 10:21:34 +0000 (+0800)
Subject: perf/x86/intel: Update dyn_constraint base on PEBS event precise level
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=e89c5d1f290e8915e0aad10014f2241086ea95e4;p=thirdparty%2Flinux.git

perf/x86/intel: Update dyn_constraint base on PEBS event precise level

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

Update event dyn_constraint base on PEBS event precise level.

Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20251029102136.61364-11-dapeng1.mi@linux.intel.com
---

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 6e04d73dfae50..40ccfd80d5544 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -4252,6 +4252,8 @@ static int intel_pmu_hw_config(struct perf_event *event)
 	}
 
 	if (event->attr.precise_ip) {
+		struct arch_pebs_cap pebs_cap = hybrid(event->pmu, arch_pebs_cap);
+
 		if ((event->attr.config & INTEL_ARCH_EVENT_MASK) == INTEL_FIXED_VLBR_EVENT)
 			return -EINVAL;
 
@@ -4265,6 +4267,15 @@ static int intel_pmu_hw_config(struct perf_event *event)
 		}
 		if (x86_pmu.pebs_aliases)
 			x86_pmu.pebs_aliases(event);
+
+		if (x86_pmu.arch_pebs) {
+			u64 cntr_mask = hybrid(event->pmu, intel_ctrl) &
+						~GLOBAL_CTRL_EN_PERF_METRICS;
+			u64 pebs_mask = event->attr.precise_ip >= 3 ?
+						pebs_cap.pdists : pebs_cap.counters;
+			if (cntr_mask != pebs_mask)
+				event->hw.dyn_constraint &= pebs_mask;
+		}
 	}
 
 	if (needs_branch_stack(event)) {
diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c
index 5c26a5235f94c..1179980f795b9 100644
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -3005,6 +3005,7 @@ 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;
 
 	x86_pmu.pebs_enable = __intel_pmu_pebs_enable;
 	x86_pmu.pebs_disable = __intel_pmu_pebs_disable;