linux-kernel - [tip: perf/urgent] perf/x86/core: Set pebs_capable and PMU_FL_PEBS

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Message-ID: <166115885174.401.8267835272671684126.tip-bot2@tip-bot2>
Date:   Mon, 22 Aug 2022 09:00:51 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Like Xu <likexu@...cent.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Kan Liang <kan.liang@...ux.intel.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: perf/urgent] perf/x86/core: Set pebs_capable and
 PMU_FL_PEBS_ALL for the Baseline

The following commit has been merged into the perf/urgent branch of tip:

Commit-ID:     7d3598868aaee05eb738d1c3115616b867e7530a
Gitweb:        https://git.kernel.org/tip/7d3598868aaee05eb738d1c3115616b867e7530a
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Tue, 16 Aug 2022 19:40:57 +08:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Fri, 19 Aug 2022 19:47:31 +02:00

perf/x86/core: Set pebs_capable and PMU_FL_PEBS_ALL for the Baseline

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
---
 arch/x86/events/intel/core.c | 4 ----
 arch/x86/events/intel/ds.c   | 1 +
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 2db9349..cb98a05 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -6291,10 +6291,8 @@ __init int intel_pmu_init(void)
 		x86_pmu.pebs_aliases = NULL;
 		x86_pmu.pebs_prec_dist = true;
 		x86_pmu.pebs_block = true;
-		x86_pmu.pebs_capable = ~0ULL;
 		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;
 
@@ -6337,10 +6335,8 @@ __init int intel_pmu_init(void)
 		x86_pmu.pebs_aliases = NULL;
 		x86_pmu.pebs_prec_dist = true;
 		x86_pmu.pebs_block = true;
-		x86_pmu.pebs_capable = ~0ULL;
 		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 ba60427..ac6dd4c 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 {