linux-kernel - [PATCH V2 11/23] perf/x86/intel/lbr: Unify the stored format of LBR information

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Date:   Fri, 26 Jun 2020 11:20:08 -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, wei.w.wang@...el.com,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH V2 11/23] perf/x86/intel/lbr: Unify the stored format of LBR information

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

Current LBR information in the structure x86_perf_task_context is stored
in a different format from the PEBS LBR record and Architecture LBR,
which prevents the sharing of the common codes.

Use the format of the PEBS LBR record as a unified format. Use a generic
name lbr_entry to replace pebs_lbr_entry.

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---
 arch/x86/events/intel/ds.c        |  4 ++--
 arch/x86/events/intel/lbr.c       | 12 ++++++------
 arch/x86/events/perf_event.h      |  4 +---
 arch/x86/include/asm/perf_event.h |  4 ++--
 4 files changed, 11 insertions(+), 13 deletions(-)

diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c
index dc43cc1..0d33f85 100644
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -954,7 +954,7 @@ static void adaptive_pebs_record_size_update(void)
 	if (pebs_data_cfg & PEBS_DATACFG_XMMS)
 		sz += sizeof(struct pebs_xmm);
 	if (pebs_data_cfg & PEBS_DATACFG_LBRS)
-		sz += x86_pmu.lbr_nr * sizeof(struct pebs_lbr_entry);
+		sz += x86_pmu.lbr_nr * sizeof(struct lbr_entry);
 
 	cpuc->pebs_record_size = sz;
 }
@@ -1598,7 +1598,7 @@ static void setup_pebs_adaptive_sample_data(struct perf_event *event,
 		struct pebs_lbr *lbr = next_record;
 		int num_lbr = ((format_size >> PEBS_DATACFG_LBR_SHIFT)
 					& 0xff) + 1;
-		next_record = next_record + num_lbr*sizeof(struct pebs_lbr_entry);
+		next_record = next_record + num_lbr * sizeof(struct lbr_entry);
 
 		if (has_branch_stack(event)) {
 			intel_pmu_store_pebs_lbrs(lbr);
diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c
index 918f89d..3d5fec4 100644
--- a/arch/x86/events/intel/lbr.c
+++ b/arch/x86/events/intel/lbr.c
@@ -371,11 +371,11 @@ void intel_pmu_lbr_restore(void *ctx)
 	mask = x86_pmu.lbr_nr - 1;
 	for (i = 0; i < task_ctx->valid_lbrs; i++) {
 		lbr_idx = (tos - i) & mask;
-		wrlbr_from(lbr_idx, task_ctx->lbr_from[i]);
-		wrlbr_to  (lbr_idx, task_ctx->lbr_to[i]);
+		wrlbr_from(lbr_idx, task_ctx->lbr[i].from);
+		wrlbr_to(lbr_idx, task_ctx->lbr[i].to);
 
 		if (x86_pmu.intel_cap.lbr_format == LBR_FORMAT_INFO)
-			wrmsrl(MSR_LBR_INFO_0 + lbr_idx, task_ctx->lbr_info[i]);
+			wrmsrl(MSR_LBR_INFO_0 + lbr_idx, task_ctx->lbr[i].info);
 	}
 
 	for (; i < x86_pmu.lbr_nr; i++) {
@@ -435,10 +435,10 @@ void intel_pmu_lbr_save(void *ctx)
 		from = rdlbr_from(lbr_idx);
 		if (!from)
 			break;
-		task_ctx->lbr_from[i] = from;
-		task_ctx->lbr_to[i]   = rdlbr_to(lbr_idx);
+		task_ctx->lbr[i].from = from;
+		task_ctx->lbr[i].to = rdlbr_to(lbr_idx);
 		if (x86_pmu.intel_cap.lbr_format == LBR_FORMAT_INFO)
-			rdmsrl(MSR_LBR_INFO_0 + lbr_idx, task_ctx->lbr_info[i]);
+			rdmsrl(MSR_LBR_INFO_0 + lbr_idx, task_ctx->lbr[i].info);
 	}
 	task_ctx->valid_lbrs = i;
 	task_ctx->tos = tos;
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index 62fba45..fd16ed3 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -755,12 +755,10 @@ struct x86_perf_task_context_opt {
 };
 
 struct x86_perf_task_context {
-	u64 lbr_from[MAX_LBR_ENTRIES];
-	u64 lbr_to[MAX_LBR_ENTRIES];
-	u64 lbr_info[MAX_LBR_ENTRIES];
 	int tos;
 	int valid_lbrs;
 	struct x86_perf_task_context_opt opt;
+	struct lbr_entry lbr[MAX_LBR_ENTRIES];
 };
 
 #define x86_add_quirk(func_)						\
diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
index d33cc82..7266aef 100644
--- a/arch/x86/include/asm/perf_event.h
+++ b/arch/x86/include/asm/perf_event.h
@@ -262,12 +262,12 @@ struct pebs_xmm {
 	u64 xmm[16*2];	/* two entries for each register */
 };
 
-struct pebs_lbr_entry {
+struct lbr_entry {
 	u64 from, to, info;
 };
 
 struct pebs_lbr {
-	struct pebs_lbr_entry lbr[0]; /* Variable length */
+	struct lbr_entry lbr[0]; /* Variable length */
 };
 
 /*
-- 
2.7.4