include/kvm/arm_pmu.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2015 Linaro Ltd.
   4  * Author: Shannon Zhao <shannon.zhao@linaro.org>
   5  */
   6
   7 #ifndef __ASM_ARM_KVM_PMU_H
   8 #define __ASM_ARM_KVM_PMU_H
   9
  10 #include <linux/perf_event.h>
  11 #include <asm/perf_event.h>
  12
  13 #define ARMV8_PMU_CYCLE_IDX             (ARMV8_PMU_MAX_COUNTERS - 1)
  14
  15 #ifdef CONFIG_HW_PERF_EVENTS
  16
  17 struct kvm_pmc {
  18         u8 idx; /* index into the pmu->pmc array */
  19         struct perf_event *perf_event;
  20 };
  21
  22 struct kvm_pmu_events {
  23         u32 events_host;
  24         u32 events_guest;
  25 };
  26
  27 struct kvm_pmu {
  28         struct irq_work overflow_work;
  29         struct kvm_pmu_events events;
  30         struct kvm_pmc pmc[ARMV8_PMU_MAX_COUNTERS];
  31         int irq_num;
  32         bool created;
  33         bool irq_level;
  34 };
  35
  36 struct arm_pmu_entry {
  37         struct list_head entry;
  38         struct arm_pmu *arm_pmu;
  39 };
  40
  41 DECLARE_STATIC_KEY_FALSE(kvm_arm_pmu_available);
  42
  43 static __always_inline bool kvm_arm_support_pmu_v3(void)
  44 {
  45         return static_branch_likely(&kvm_arm_pmu_available);
  46 }
  47
  48 #define kvm_arm_pmu_irq_initialized(v)  ((v)->arch.pmu.irq_num >= VGIC_NR_SGIS)
  49 u64 kvm_pmu_get_counter_value(struct kvm_vcpu *vcpu, u64 select_idx);
  50 void kvm_pmu_set_counter_value(struct kvm_vcpu *vcpu, u64 select_idx, u64 val);
  51 u64 kvm_pmu_valid_counter_mask(struct kvm_vcpu *vcpu);
  52 u64 kvm_pmu_get_pmceid(struct kvm_vcpu *vcpu, bool pmceid1);
  53 void kvm_pmu_vcpu_init(struct kvm_vcpu *vcpu);
  54 void kvm_pmu_vcpu_reset(struct kvm_vcpu *vcpu);
  55 void kvm_pmu_vcpu_destroy(struct kvm_vcpu *vcpu);
  56 void kvm_pmu_disable_counter_mask(struct kvm_vcpu *vcpu, u64 val);
  57 void kvm_pmu_enable_counter_mask(struct kvm_vcpu *vcpu, u64 val);
  58 void kvm_pmu_flush_hwstate(struct kvm_vcpu *vcpu);
  59 void kvm_pmu_sync_hwstate(struct kvm_vcpu *vcpu);
  60 bool kvm_pmu_should_notify_user(struct kvm_vcpu *vcpu);
  61 void kvm_pmu_update_run(struct kvm_vcpu *vcpu);
  62 void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val);
  63 void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val);
  64 void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, u64 data,
  65                                     u64 select_idx);
  66 int kvm_arm_pmu_v3_set_attr(struct kvm_vcpu *vcpu,
  67                             struct kvm_device_attr *attr);
  68 int kvm_arm_pmu_v3_get_attr(struct kvm_vcpu *vcpu,
  69                             struct kvm_device_attr *attr);
  70 int kvm_arm_pmu_v3_has_attr(struct kvm_vcpu *vcpu,
  71                             struct kvm_device_attr *attr);
  72 int kvm_arm_pmu_v3_enable(struct kvm_vcpu *vcpu);
  73
  74 struct kvm_pmu_events *kvm_get_pmu_events(void);
  75 void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu);
  76 void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu);
  77
  78 #define kvm_vcpu_has_pmu(vcpu)                                  \
  79         (test_bit(KVM_ARM_VCPU_PMU_V3, (vcpu)->arch.features))
  80
  81 /*
  82  * Updates the vcpu's view of the pmu events for this cpu.
  83  * Must be called before every vcpu run after disabling interrupts, to ensure
  84  * that an interrupt cannot fire and update the structure.
  85  */
  86 #define kvm_pmu_update_vcpu_events(vcpu)                                \
  87         do {                                                            \
  88                 if (!has_vhe() && kvm_vcpu_has_pmu(vcpu))               \
  89                         vcpu->arch.pmu.events = *kvm_get_pmu_events();  \
  90         } while (0)
  91
  92 /*
  93  * Evaluates as true when emulating PMUv3p5, and false otherwise.
  94  */
  95 #define kvm_pmu_is_3p5(vcpu)                                            \
  96         (vcpu->kvm->arch.dfr0_pmuver.imp >= ID_AA64DFR0_EL1_PMUVer_V3P5)
  97
  98 u8 kvm_arm_pmu_get_pmuver_limit(void);
  99
 100 #else
 101 struct kvm_pmu {
 102 };
 103
 104 static inline bool kvm_arm_support_pmu_v3(void)
 105 {
 106         return false;
 107 }
 108
 109 #define kvm_arm_pmu_irq_initialized(v)  (false)
 110 static inline u64 kvm_pmu_get_counter_value(struct kvm_vcpu *vcpu,
 111                                             u64 select_idx)
 112 {
 113         return 0;
 114 }
 115 static inline void kvm_pmu_set_counter_value(struct kvm_vcpu *vcpu,
 116                                              u64 select_idx, u64 val) {}
 117 static inline u64 kvm_pmu_valid_counter_mask(struct kvm_vcpu *vcpu)
 118 {
 119         return 0;
 120 }
 121 static inline void kvm_pmu_vcpu_init(struct kvm_vcpu *vcpu) {}
 122 static inline void kvm_pmu_vcpu_reset(struct kvm_vcpu *vcpu) {}
 123 static inline void kvm_pmu_vcpu_destroy(struct kvm_vcpu *vcpu) {}
 124 static inline void kvm_pmu_disable_counter_mask(struct kvm_vcpu *vcpu, u64 val) {}
 125 static inline void kvm_pmu_enable_counter_mask(struct kvm_vcpu *vcpu, u64 val) {}
 126 static inline void kvm_pmu_flush_hwstate(struct kvm_vcpu *vcpu) {}
 127 static inline void kvm_pmu_sync_hwstate(struct kvm_vcpu *vcpu) {}
 128 static inline bool kvm_pmu_should_notify_user(struct kvm_vcpu *vcpu)
 129 {
 130         return false;
 131 }
 132 static inline void kvm_pmu_update_run(struct kvm_vcpu *vcpu) {}
 133 static inline void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val) {}
 134 static inline void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val) {}
 135 static inline void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu,
 136                                                   u64 data, u64 select_idx) {}
 137 static inline int kvm_arm_pmu_v3_set_attr(struct kvm_vcpu *vcpu,
 138                                           struct kvm_device_attr *attr)
 139 {
 140         return -ENXIO;
 141 }
 142 static inline int kvm_arm_pmu_v3_get_attr(struct kvm_vcpu *vcpu,
 143                                           struct kvm_device_attr *attr)
 144 {
 145         return -ENXIO;
 146 }
 147 static inline int kvm_arm_pmu_v3_has_attr(struct kvm_vcpu *vcpu,
 148                                           struct kvm_device_attr *attr)
 149 {
 150         return -ENXIO;
 151 }
 152 static inline int kvm_arm_pmu_v3_enable(struct kvm_vcpu *vcpu)
 153 {
 154         return 0;
 155 }
 156 static inline u64 kvm_pmu_get_pmceid(struct kvm_vcpu *vcpu, bool pmceid1)
 157 {
 158         return 0;
 159 }
 160
 161 #define kvm_vcpu_has_pmu(vcpu)          ({ false; })
 162 #define kvm_pmu_is_3p5(vcpu)            ({ false; })
 163 static inline void kvm_pmu_update_vcpu_events(struct kvm_vcpu *vcpu) {}
 164 static inline void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu) {}
 165 static inline void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu) {}
 166 static inline u8 kvm_arm_pmu_get_pmuver_limit(void)
 167 {
 168         return 0;
 169 }
 170
 171 #endif
 172
 173 #endif