linux-kernel - [RFC PATCH 16/17] perf/x86/intel/pt: Add PMU info

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Date:   Tue,  5 Sep 2017 16:30:25 +0300
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:     Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        acme@...hat.com, kirill.shutemov@...ux.intel.com,
        Borislav Petkov <bp@...en8.de>, rric@...nel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [RFC PATCH 16/17] perf/x86/intel/pt: Add PMU info

Add PMU-specific data structure with family/model/stepping and clock
information required by the decoder.

Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
---
 arch/x86/events/intel/pt.c | 23 ++++++++++++++++++++++-
 arch/x86/events/intel/pt.h | 11 +++++++++++
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c
index 3b993942a0..053b96f491 100644
--- a/arch/x86/events/intel/pt.c
+++ b/arch/x86/events/intel/pt.c
@@ -35,6 +35,8 @@
 
 static DEFINE_PER_CPU(struct pt, pt_ctx);
 
+#define PMU_NAME "intel_pt"
+
 static struct pt_pmu pt_pmu;
 
 /*
@@ -271,6 +273,22 @@ static int __init pt_pmu_hw_init(void)
 	return ret;
 }
 
+static struct intel_pt_pmu_info pt_pmu_info;
+
+static void pt_pmu_info_setup(void)
+{
+	BUILD_BUG_ON(sizeof(pt_pmu_info) +
+	             sizeof(struct perf_event_mmap_page) > PAGE_SIZE);
+	pt_pmu_info.pi.note_size  = sizeof(pt_pmu_info.pi);
+	pt_pmu_info.pi.pmu_descsz = sizeof(pt_pmu_info) - pt_pmu_info.pi.note_size;
+	pt_pmu_info.x86_family    = boot_cpu_data.x86;
+	pt_pmu_info.x86_model     = boot_cpu_data.x86_model;
+	pt_pmu_info.x86_step      = boot_cpu_data.x86_mask;
+	pt_pmu_info.x86_tsc_max_nonturbo_ratio = pt_pmu.max_nonturbo_ratio;
+	pt_pmu_info.x86_tsc_to_art_numerator   = pt_pmu.tsc_art_num;
+	pt_pmu_info.x86_tsc_to_art_denominator = pt_pmu.tsc_art_den;
+}
+
 #define RTIT_CTL_CYC_PSB (RTIT_CTL_CYCLEACC	| \
 			  RTIT_CTL_CYC_THRESH	| \
 			  RTIT_CTL_PSB_FREQ)
@@ -1512,6 +1530,8 @@ static __init int pt_init(void)
 		return -ENODEV;
 	}
 
+	pt_pmu_info_setup();
+
 	if (!pt_cap_get(PT_CAP_topa_multiple_entries))
 		pt_pmu.pmu.capabilities =
 			PERF_PMU_CAP_AUX_NO_SG | PERF_PMU_CAP_AUX_SW_DOUBLEBUF;
@@ -1531,8 +1551,9 @@ static __init int pt_init(void)
 	pt_pmu.pmu.addr_filters_validate = pt_event_addr_filters_validate;
 	pt_pmu.pmu.nr_addr_filters       =
 		pt_cap_get(PT_CAP_num_address_ranges);
+	pt_pmu.pmu.pmu_info		 = &pt_pmu_info.pi;
 
-	ret = perf_pmu_register(&pt_pmu.pmu, "intel_pt", -1);
+	ret = perf_pmu_register(&pt_pmu.pmu, PMU_NAME, -1);
 
 	return ret;
 }
diff --git a/arch/x86/events/intel/pt.h b/arch/x86/events/intel/pt.h
index 25fa9710f4..fc19080ca3 100644
--- a/arch/x86/events/intel/pt.h
+++ b/arch/x86/events/intel/pt.h
@@ -189,4 +189,15 @@ struct pt {
 	int			vmx_on;
 };
 
+struct intel_pt_pmu_info {
+	struct pmu_info		pi;
+	u8			x86_family;
+	u8			x86_model;
+	u8			x86_step;
+	u8			x86_tsc_max_nonturbo_ratio;
+	u32			x86_tsc_to_art_numerator;
+	u32			x86_tsc_to_art_denominator;
+	u32			__reserved_0;
+};
+
 #endif /* __INTEL_PT_H__ */
-- 
2.14.1