linux-kernel - [PATCH 03/21] perf/x86/intel/lbr: Add pointer for LBR reset

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Date:   Fri, 19 Jun 2020 07:03:51 -0700
From:   kan.liang@...ux.intel.com
To:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        tglx@...utronix.de, bp@...en8.de, x86@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org, dave.hansen@...el.com,
        yu-cheng.yu@...el.com, bigeasy@...utronix.de, gorcunov@...il.com,
        hpa@...or.com, alexey.budankov@...ux.intel.com, eranian@...gle.com,
        ak@...ux.intel.com, like.xu@...ux.intel.com,
        yao.jin@...ux.intel.com, Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH 03/21] perf/x86/intel/lbr: Add pointer for LBR reset

From: Kan Liang <kan.liang@...ux.intel.com>

The method to reset Architectural LBRs is different from previous
model-specific LBR. Perf has to implement a different function.

A function pointer is introduced for LBR reset. The enum of
LBR_FORMAT_* is also moved to perf_event.h. Perf should initialize the
corresponding functions at boot time, and avoid checking lbr_format at
run time.

The current 64-bit LBR reset function is set as default.

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---
 arch/x86/events/intel/core.c |  5 +++++
 arch/x86/events/intel/lbr.c  | 20 +++-----------------
 arch/x86/events/perf_event.h | 16 ++++++++++++++++
 3 files changed, 24 insertions(+), 17 deletions(-)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 56966fc..995acdb 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3954,6 +3954,7 @@ static __initconst const struct x86_pmu core_pmu = {
 
 	.lbr_enable		= intel_pmu_lbr_enable,
 	.lbr_disable		= intel_pmu_lbr_disable,
+	.lbr_reset		= intel_pmu_lbr_reset_64,
 };
 
 static __initconst const struct x86_pmu intel_pmu = {
@@ -4002,6 +4003,7 @@ static __initconst const struct x86_pmu intel_pmu = {
 
 	.lbr_enable		= intel_pmu_lbr_enable,
 	.lbr_disable		= intel_pmu_lbr_disable,
+	.lbr_reset		= intel_pmu_lbr_reset_64,
 };
 
 static __init void intel_clovertown_quirk(void)
@@ -4628,6 +4630,9 @@ __init int intel_pmu_init(void)
 		x86_pmu.intel_cap.capabilities = capabilities;
 	}
 
+	if (x86_pmu.intel_cap.lbr_format == LBR_FORMAT_32)
+		x86_pmu.lbr_reset = intel_pmu_lbr_reset_32;
+
 	intel_ds_init();
 
 	x86_add_quirk(intel_arch_events_quirk); /* Install first, so it runs last */
diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c
index bdd38b6..ff320d1 100644
--- a/arch/x86/events/intel/lbr.c
+++ b/arch/x86/events/intel/lbr.c
@@ -8,17 +8,6 @@
 
 #include "../perf_event.h"
 
-enum {
-	LBR_FORMAT_32		= 0x00,
-	LBR_FORMAT_LIP		= 0x01,
-	LBR_FORMAT_EIP		= 0x02,
-	LBR_FORMAT_EIP_FLAGS	= 0x03,
-	LBR_FORMAT_EIP_FLAGS2	= 0x04,
-	LBR_FORMAT_INFO		= 0x05,
-	LBR_FORMAT_TIME		= 0x06,
-	LBR_FORMAT_MAX_KNOWN    = LBR_FORMAT_TIME,
-};
-
 static const enum {
 	LBR_EIP_FLAGS		= 1,
 	LBR_TSX			= 2,
@@ -194,7 +183,7 @@ void intel_pmu_lbr_disable(void)
 	wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctl);
 }
 
-static void intel_pmu_lbr_reset_32(void)
+void intel_pmu_lbr_reset_32(void)
 {
 	int i;
 
@@ -202,7 +191,7 @@ static void intel_pmu_lbr_reset_32(void)
 		wrmsrl(x86_pmu.lbr_from + i, 0);
 }
 
-static void intel_pmu_lbr_reset_64(void)
+void intel_pmu_lbr_reset_64(void)
 {
 	int i;
 
@@ -221,10 +210,7 @@ void intel_pmu_lbr_reset(void)
 	if (!x86_pmu.lbr_nr)
 		return;
 
-	if (x86_pmu.intel_cap.lbr_format == LBR_FORMAT_32)
-		intel_pmu_lbr_reset_32();
-	else
-		intel_pmu_lbr_reset_64();
+	x86_pmu.lbr_reset();
 
 	cpuc->last_task_ctx = NULL;
 	cpuc->last_log_id = 0;
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index a61a076..abf95ef 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -179,6 +179,17 @@ struct x86_perf_task_context;
 #define MAX_LBR_ENTRIES		32
 
 enum {
+	LBR_FORMAT_32		= 0x00,
+	LBR_FORMAT_LIP		= 0x01,
+	LBR_FORMAT_EIP		= 0x02,
+	LBR_FORMAT_EIP_FLAGS	= 0x03,
+	LBR_FORMAT_EIP_FLAGS2	= 0x04,
+	LBR_FORMAT_INFO		= 0x05,
+	LBR_FORMAT_TIME		= 0x06,
+	LBR_FORMAT_MAX_KNOWN    = LBR_FORMAT_TIME,
+};
+
+enum {
 	X86_PERF_KFREE_SHARED = 0,
 	X86_PERF_KFREE_EXCL   = 1,
 	X86_PERF_KFREE_MAX
@@ -681,6 +692,7 @@ struct x86_pmu {
 
 	void		(*lbr_enable)(bool pmi);
 	void		(*lbr_disable)(void);
+	void		(*lbr_reset)(void);
 
 	/*
 	 * Intel PT/LBR/BTS are exclusive
@@ -1056,6 +1068,10 @@ u64 lbr_from_signext_quirk_wr(u64 val);
 
 void intel_pmu_lbr_reset(void);
 
+void intel_pmu_lbr_reset_32(void);
+
+void intel_pmu_lbr_reset_64(void);
+
 void intel_pmu_lbr_add(struct perf_event *event);
 
 void intel_pmu_lbr_del(struct perf_event *event);
-- 
2.7.4