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From: Dapeng Mi <dapeng1.mi@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Namhyung Kim <namhyung@kernel.org>,
	Ian Rogers <irogers@google.com>,
	Adrian Hunter <adrian.hunter@intel.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Andi Kleen <ak@linux.intel.com>,
	Eranian Stephane <eranian@google.com>
Cc: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
	Dapeng Mi <dapeng1.mi@intel.com>, Zide Chen <zide.chen@intel.com>,
	Falcon Thomas <thomas.falcon@intel.com>,
	Xudong Hao <xudong.hao@intel.com>,
	Dapeng Mi <dapeng1.mi@linux.intel.com>
Subject: [PATCH 05/15] perf/x86/intel: Pass correct PEBS counter mask to no-drain update path
Date: Mon, 28 Sep 2026 15:42:59 +0800	[thread overview]
Message-ID: <20260928074309.898043-6-dapeng1.mi@linux.intel.com> (raw)
In-Reply-To: <20260928074309.898043-1-dapeng1.mi@linux.intel.com>

intel_pmu_drain_arch_pebs() calls intel_pmu_pebs_event_update_no_drain()
with X86_PMC_IDX_MAX, but that parameter is a counter bitmask, not a
max index value. As a result, PEBS event state is not updated/restored
correctly on the no-drain path.

Pass the PEBS counter mask to intel_pmu_pebs_event_update_no_drain().

Fixes: d21954c8a0ff ("perf/x86/intel: Process arch-PEBS records or record fragments")
Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
---
 arch/x86/events/intel/ds.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c
index 8444670cee4a..0f24098587bf 100644
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -3358,8 +3358,9 @@ static int intel_pmu_drain_arch_pebs(struct pt_regs *iregs,
 
 	rdmsrq(MSR_IA32_PEBS_INDEX, index.whole);
 
+	mask = hybrid(cpuc->pmu, arch_pebs_cap).counters & cpuc->pebs_enabled;
 	if (unlikely(!index.wr)) {
-		intel_pmu_pebs_event_update_no_drain(cpuc, X86_PMC_IDX_MAX);
+		intel_pmu_pebs_event_update_no_drain(cpuc, mask);
 		return 0;
 	}
 
@@ -3375,8 +3376,6 @@ static int intel_pmu_drain_arch_pebs(struct pt_regs *iregs,
 		index.thresh = ARCH_PEBS_THRESH_SINGLE;
 	wrmsrq(MSR_IA32_PEBS_INDEX, index.whole);
 
-	mask = hybrid(cpuc->pmu, arch_pebs_cap).counters & cpuc->pebs_enabled;
-
 	if (!iregs)
 		iregs = &dummy_iregs;
 
-- 
2.34.1


  parent reply	other threads:[~2026-09-28  7:50 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-28  7:42 [PATCH 00/15] perf/x86: Fix sampling bugs and relax slots-event grouping Dapeng Mi
2026-09-28  7:42 ` [PATCH 01/15] perf/x86/intel: Guard leader sibling walk on nr_siblings Dapeng Mi
2026-09-28  7:42 ` [PATCH 02/15] perf/x86/intel: Reset active_fixed_ctrl_val on CPU teardown Dapeng Mi
2026-09-28  7:42 ` [PATCH 03/15] perf/x86/intel: Reset active_pebs_data_cfg " Dapeng Mi
2026-09-28  7:42 ` [PATCH 04/15] perf/x86/intel: Reset cached acr_cfg_b[] and cfg_c_val[] " Dapeng Mi
2026-09-28  7:42 ` Dapeng Mi [this message]
2026-09-28  7:43 ` [PATCH 06/15] perf/x86/intel: Limit PEBS counter iteration to valid array bounds Dapeng Mi
2026-09-28  7:43 ` [PATCH 07/15] perf/x86/intel: Reject SAMPLE_READ for no-counter-snapshot ACR events Dapeng Mi
2026-09-28  7:43 ` [PATCH 08/15] perf/x86/intel: Fix stale PEBS count without counter-group support Dapeng Mi
2026-09-28  7:43 ` [PATCH 09/15] perf/x86/intel: Refactor intel_pmu_drain_arch_pebs() Dapeng Mi
2026-09-28  7:43 ` [PATCH 10/15] perf/x86/intel: Refactor intel_pmu_drain_pebs_icl() Dapeng Mi
2026-09-28  7:43 ` [PATCH 11/15] perf/x86/intel: Fix invalid PEBS counts with counter-group support Dapeng Mi
2026-09-28  7:43 ` [PATCH 12/15] perf/x86/intel: Make ACR static_call update architectural Dapeng Mi
2026-09-28  7:43 ` [PATCH 13/15] perf/x86: Validate event type before topdown/mem-loads classification Dapeng Mi
2026-09-28  7:43 ` [PATCH 14/15] perf/core: Add event_caps dependency flags Dapeng Mi
2026-09-28  7:43 ` [PATCH 15/15] perf/x86/intel: Allow Topdown metrics with a non-leader slots event Dapeng Mi

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