linux-kernel - [tip: perf/urgent] perf/x86/intel: Fix the FRONTEND encoding on GNR and MTL

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Date:   Fri, 16 Jun 2023 15:08:40 -0000
From:   "tip-bot2 for Kan Liang" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Kan Liang <kan.liang@...ux.intel.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        stable@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: perf/urgent] perf/x86/intel: Fix the FRONTEND encoding on GNR and MTL

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

Commit-ID:     a6742cb90b567f952a95efa27dee345748d09fc7
Gitweb:        https://git.kernel.org/tip/a6742cb90b567f952a95efa27dee345748d09fc7
Author:        Kan Liang <kan.liang@...ux.intel.com>
AuthorDate:    Thu, 15 Jun 2023 10:32:42 -07:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Fri, 16 Jun 2023 16:46:33 +02:00

perf/x86/intel: Fix the FRONTEND encoding on GNR and MTL

When counting a FRONTEND event, the MSR_PEBS_FRONTEND is not correctly
set on GNR and MTL p-core.

The umask value for the FRONTEND events is changed on GNR and MTL. The
new umask is missing in the extra_regs[] table.

Add a dedicated intel_gnr_extra_regs[] for GNR and MTL p-core.

Fixes: bc4000fdb009 ("perf/x86/intel: Add Granite Rapids")
Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: stable@...r.kernel.org
Link: https://lkml.kernel.org/r/20230615173242.3726364-1-kan.liang@linux.intel.com
---
 arch/x86/events/intel/core.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 89b9c1c..27f3a7b 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -349,6 +349,16 @@ static struct event_constraint intel_spr_event_constraints[] = {
 	EVENT_CONSTRAINT_END
 };
 
+static struct extra_reg intel_gnr_extra_regs[] __read_mostly = {
+	INTEL_UEVENT_EXTRA_REG(0x012a, MSR_OFFCORE_RSP_0, 0x3fffffffffull, RSP_0),
+	INTEL_UEVENT_EXTRA_REG(0x012b, MSR_OFFCORE_RSP_1, 0x3fffffffffull, RSP_1),
+	INTEL_UEVENT_PEBS_LDLAT_EXTRA_REG(0x01cd),
+	INTEL_UEVENT_EXTRA_REG(0x02c6, MSR_PEBS_FRONTEND, 0x9, FE),
+	INTEL_UEVENT_EXTRA_REG(0x03c6, MSR_PEBS_FRONTEND, 0x7fff1f, FE),
+	INTEL_UEVENT_EXTRA_REG(0x40ad, MSR_PEBS_FRONTEND, 0x7, FE),
+	INTEL_UEVENT_EXTRA_REG(0x04c2, MSR_PEBS_FRONTEND, 0x8, FE),
+	EVENT_EXTRA_END
+};
 
 EVENT_ATTR_STR(mem-loads,	mem_ld_nhm,	"event=0x0b,umask=0x10,ldlat=3");
 EVENT_ATTR_STR(mem-loads,	mem_ld_snb,	"event=0xcd,umask=0x1,ldlat=3");
@@ -6496,6 +6506,7 @@ __init int intel_pmu_init(void)
 	case INTEL_FAM6_SAPPHIRERAPIDS_X:
 	case INTEL_FAM6_EMERALDRAPIDS_X:
 		x86_pmu.flags |= PMU_FL_MEM_LOADS_AUX;
+		x86_pmu.extra_regs = intel_spr_extra_regs;
 		fallthrough;
 	case INTEL_FAM6_GRANITERAPIDS_X:
 	case INTEL_FAM6_GRANITERAPIDS_D:
@@ -6506,7 +6517,8 @@ __init int intel_pmu_init(void)
 
 		x86_pmu.event_constraints = intel_spr_event_constraints;
 		x86_pmu.pebs_constraints = intel_spr_pebs_event_constraints;
-		x86_pmu.extra_regs = intel_spr_extra_regs;
+		if (!x86_pmu.extra_regs)
+			x86_pmu.extra_regs = intel_gnr_extra_regs;
 		x86_pmu.limit_period = spr_limit_period;
 		x86_pmu.pebs_ept = 1;
 		x86_pmu.pebs_aliases = NULL;
@@ -6650,6 +6662,7 @@ __init int intel_pmu_init(void)
 		pmu->pebs_constraints = intel_grt_pebs_event_constraints;
 		pmu->extra_regs = intel_grt_extra_regs;
 		if (is_mtl(boot_cpu_data.x86_model)) {
+			x86_pmu.hybrid_pmu[X86_HYBRID_PMU_CORE_IDX].extra_regs = intel_gnr_extra_regs;
 			x86_pmu.pebs_latency_data = mtl_latency_data_small;
 			extra_attr = boot_cpu_has(X86_FEATURE_RTM) ?
 				mtl_hybrid_extra_attr_rtm : mtl_hybrid_extra_attr;