linux-kernel - [PATCH 04/49] perf/x86: Hybrid PMU support for intel

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Date:   Mon,  8 Feb 2021 07:25:01 -0800
From:   kan.liang@...ux.intel.com
To:     peterz@...radead.org, acme@...nel.org, mingo@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     tglx@...utronix.de, bp@...en8.de, namhyung@...nel.org,
        jolsa@...hat.com, ak@...ux.intel.com, yao.jin@...ux.intel.com,
        alexander.shishkin@...ux.intel.com, adrian.hunter@...el.com,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH 04/49] perf/x86: Hybrid PMU support for intel_ctrl

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

The intel_ctrl is the event mask of a PMU. The PMU counter information
may be different among hybrid PMUs, each hybrid PMU should use its own
intel_ctrl.

When handling a certain hybrid PMU, apply the intel_ctrl from the
corresponding hybrid PMU.

Reviewed-by: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---
 arch/x86/events/core.c       |  4 ++--
 arch/x86/events/intel/core.c | 14 +++++++++-----
 arch/x86/events/perf_event.h |  7 +++++--
 3 files changed, 16 insertions(+), 9 deletions(-)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 334553f..170acbf 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -256,7 +256,7 @@ static bool check_hw_exists(void)
 		if (ret)
 			goto msr_fail;
 		for (i = 0; i < x86_pmu.num_counters_fixed; i++) {
-			if (fixed_counter_disabled(i))
+			if (fixed_counter_disabled(i, NULL))
 				continue;
 			if (val & (0x03 << i*4)) {
 				bios_fail = 1;
@@ -1535,7 +1535,7 @@ void perf_event_print_debug(void)
 			cpu, idx, prev_left);
 	}
 	for (idx = 0; idx < x86_pmu.num_counters_fixed; idx++) {
-		if (fixed_counter_disabled(idx))
+		if (fixed_counter_disabled(idx, cpuc))
 			continue;
 		rdmsrl(MSR_ARCH_PERFMON_FIXED_CTR0 + idx, pmc_count);
 
diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 4d026f6..1b9563c 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -2153,10 +2153,11 @@ static void intel_pmu_disable_all(void)
 static void __intel_pmu_enable_all(int added, bool pmi)
 {
 	struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
+	u64 intel_ctrl = X86_HYBRID_READ_FROM_CPUC(intel_ctrl, cpuc);
 
 	intel_pmu_lbr_enable_all(pmi);
 	wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL,
-			x86_pmu.intel_ctrl & ~cpuc->intel_ctrl_guest_mask);
+	       intel_ctrl & ~cpuc->intel_ctrl_guest_mask);
 
 	if (test_bit(INTEL_PMC_IDX_FIXED_BTS, cpuc->active_mask)) {
 		struct perf_event *event =
@@ -2709,6 +2710,7 @@ int intel_pmu_save_and_restart(struct perf_event *event)
 static void intel_pmu_reset(void)
 {
 	struct debug_store *ds = __this_cpu_read(cpu_hw_events.ds);
+	struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
 	unsigned long flags;
 	int idx;
 
@@ -2724,7 +2726,7 @@ static void intel_pmu_reset(void)
 		wrmsrl_safe(x86_pmu_event_addr(idx),  0ull);
 	}
 	for (idx = 0; idx < x86_pmu.num_counters_fixed; idx++) {
-		if (fixed_counter_disabled(idx))
+		if (fixed_counter_disabled(idx, cpuc))
 			continue;
 		wrmsrl_safe(MSR_ARCH_PERFMON_FIXED_CTR0 + idx, 0ull);
 	}
@@ -2753,6 +2755,7 @@ static int handle_pmi_common(struct pt_regs *regs, u64 status)
 	struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
 	int bit;
 	int handled = 0;
+	u64 intel_ctrl = X86_HYBRID_READ_FROM_CPUC(intel_ctrl, cpuc);
 
 	inc_irq_stat(apic_perf_irqs);
 
@@ -2798,7 +2801,7 @@ static int handle_pmi_common(struct pt_regs *regs, u64 status)
 
 		handled++;
 		x86_pmu.drain_pebs(regs, &data);
-		status &= x86_pmu.intel_ctrl | GLOBAL_STATUS_TRACE_TOPAPMI;
+		status &= intel_ctrl | GLOBAL_STATUS_TRACE_TOPAPMI;
 
 		/*
 		 * PMI throttle may be triggered, which stops the PEBS event.
@@ -3808,10 +3811,11 @@ static struct perf_guest_switch_msr *intel_guest_get_msrs(int *nr)
 {
 	struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
 	struct perf_guest_switch_msr *arr = cpuc->guest_switch_msrs;
+	u64 intel_ctrl = X86_HYBRID_READ_FROM_CPUC(intel_ctrl, cpuc);
 
 	arr[0].msr = MSR_CORE_PERF_GLOBAL_CTRL;
-	arr[0].host = x86_pmu.intel_ctrl & ~cpuc->intel_ctrl_guest_mask;
-	arr[0].guest = x86_pmu.intel_ctrl & ~cpuc->intel_ctrl_host_mask;
+	arr[0].host = intel_ctrl & ~cpuc->intel_ctrl_guest_mask;
+	arr[0].guest = intel_ctrl & ~cpuc->intel_ctrl_host_mask;
 	if (x86_pmu.flags & PMU_FL_PEBS_ALL)
 		arr[0].guest &= ~cpuc->pebs_enabled;
 	else
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index a53d4dd..b939784 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -647,6 +647,7 @@ enum x86_hybrid_pmu_type_idx {
 struct x86_hybrid_pmu {
 	struct pmu			pmu;
 	union perf_capabilities		intel_cap;
+	u64				intel_ctrl;
 };
 
 #define IS_X86_HYBRID			cpu_feature_enabled(X86_FEATURE_HYBRID_CPU)
@@ -1106,9 +1107,11 @@ ssize_t events_sysfs_show(struct device *dev, struct device_attribute *attr,
 ssize_t events_ht_sysfs_show(struct device *dev, struct device_attribute *attr,
 			  char *page);
 
-static inline bool fixed_counter_disabled(int i)
+static inline bool fixed_counter_disabled(int i, struct cpu_hw_events *cpuc)
 {
-	return !(x86_pmu.intel_ctrl >> (i + INTEL_PMC_IDX_FIXED));
+	u64 intel_ctrl = X86_HYBRID_READ_FROM_CPUC(intel_ctrl, cpuc);
+
+	return !(intel_ctrl >> (i + INTEL_PMC_IDX_FIXED));
 }
 
 #ifdef CONFIG_CPU_SUP_AMD
-- 
2.7.4