linux-kernel - [PATCH AUTOSEL 5.19 08/33] perf/x86/core: Set pebs_capable and PMU_FL_PEBS

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Message-Id: <20220830171825.580603-8-sashal@kernel.org>
Date:   Tue, 30 Aug 2022 13:17:59 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Like Xu <likexu@...cent.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Sasha Levin <sashal@...nel.org>, mingo@...hat.com,
        acme@...nel.org, tglx@...utronix.de, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org,
        linux-perf-users@...r.kernel.org
Subject: [PATCH AUTOSEL 5.19 08/33] perf/x86/core: Set pebs_capable and PMU_FL_PEBS_ALL for the Baseline

From: Peter Zijlstra <peterz@...radead.org>

[ Upstream commit 7d3598868aaee05eb738d1c3115616b867e7530a ]

The SDM explicitly states that PEBS Baseline implies Extended PEBS.
For cpu model forward compatibility (e.g. on ICX, SPR, ADL), it's
safe to stop doing FMS table thing such as setting pebs_capable and
PMU_FL_PEBS_ALL since it's already set in the intel_ds_init().

The Goldmont Plus is the only platform which supports extended PEBS
but doesn't have Baseline. Keep the status quo.

Reported-by: Like Xu <likexu@...cent.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Kan Liang <kan.liang@...ux.intel.com>
Link: https://lkml.kernel.org/r/20220816114057.51307-1-likexu@tencent.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/x86/events/intel/core.c | 2 --
 arch/x86/events/intel/ds.c   | 1 +
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index bd8b988576097..7333f505d790e 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -6192,7 +6192,6 @@ __init int intel_pmu_init(void)
 		x86_pmu.pebs_block = true;
 		x86_pmu.flags |= PMU_FL_HAS_RSP_1;
 		x86_pmu.flags |= PMU_FL_NO_HT_SHARING;
-		x86_pmu.flags |= PMU_FL_PEBS_ALL;
 		x86_pmu.flags |= PMU_FL_INSTR_LATENCY;
 		x86_pmu.flags |= PMU_FL_MEM_LOADS_AUX;
 
@@ -6237,7 +6236,6 @@ __init int intel_pmu_init(void)
 		x86_pmu.pebs_block = true;
 		x86_pmu.flags |= PMU_FL_HAS_RSP_1;
 		x86_pmu.flags |= PMU_FL_NO_HT_SHARING;
-		x86_pmu.flags |= PMU_FL_PEBS_ALL;
 		x86_pmu.flags |= PMU_FL_INSTR_LATENCY;
 		x86_pmu.flags |= PMU_FL_MEM_LOADS_AUX;
 		x86_pmu.lbr_pt_coexist = true;
diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c
index ba60427caa6d3..ac6dd4c96dbc1 100644
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -2262,6 +2262,7 @@ void __init intel_ds_init(void)
 					PERF_SAMPLE_BRANCH_STACK |
 					PERF_SAMPLE_TIME;
 				x86_pmu.flags |= PMU_FL_PEBS_ALL;
+				x86_pmu.pebs_capable = ~0ULL;
 				pebs_qual = "-baseline";
 				x86_get_pmu(smp_processor_id())->capabilities |= PERF_PMU_CAP_EXTENDED_REGS;
 			} else {
-- 
2.35.1