linux-kernel - [PATCH 09/21] perf/x86: Expose CPUID enumeration bits for arch LBR

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Date:   Fri, 19 Jun 2020 07:03:57 -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 09/21] perf/x86: Expose CPUID enumeration bits for arch LBR

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

The LBR capabilities of Architecture LBR are retrieved from the CPUID
enumeration once at boot time. The capabilities have to be saved for
future usage.

Several new fields in x86_pmu are added to indicate the capabilities.
The fields will be used in the following patches.

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---
 arch/x86/events/perf_event.h | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index e33d348..cbfc55b 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -689,6 +689,50 @@ struct x86_pmu {
 	const int	*lbr_sel_map;		   /* lbr_select mappings */
 	bool		lbr_double_abort;	   /* duplicated lbr aborts */
 	bool		lbr_pt_coexist;		   /* (LBR|BTS) may coexist with PT */
+	bool		arch_lbr;		   /* Arch LBR supported */
+
+	/* Arch LBR Capabilities */
+	union {
+		struct {
+			/* Supported LBR depth values */
+			unsigned int	arch_lbr_depth_mask:8;
+
+			unsigned int	reserved:22;
+
+			/* Deep C-state Reset */
+			unsigned int	arch_lbr_deep_c_reset:1;
+
+			/* IP values contain LIP */
+			unsigned int	arch_lbr_lip:1;
+		};
+		unsigned int		arch_lbr_eax;
+	};
+	union {
+		struct {
+			/* CPL Filtering Supported */
+			unsigned int    arch_lbr_cpl:1;
+
+			/* Branch Filtering Supported */
+			unsigned int    arch_lbr_filter:1;
+
+			/* Call-stack Mode Supported */
+			unsigned int    arch_lbr_call_stack:1;
+		};
+		unsigned int            arch_lbr_ebx;
+	};
+	union {
+		struct {
+			/* Mispredict Bit Supported */
+			unsigned int    arch_lbr_mispred:1;
+
+			/* Timed LBRs Supported */
+			unsigned int    arch_lbr_timed_lbr:1;
+
+			/* Branch Type Field Supported */
+			unsigned int    arch_lbr_br_type:1;
+		};
+		unsigned int            arch_lbr_ecx;
+	};
 
 	void		(*lbr_enable)(bool pmi);
 	void		(*lbr_disable)(void);
-- 
2.7.4