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 <linux/perf/arm_pmuv3.h>
  12
  13 #define ARMV8_PMU_CYCLE_IDX             (ARMV8_PMU_MAX_COUNTERS - 1)
  14
  15 #if IS_ENABLED(CONFIG_HW_PERF_EVENTS) && IS_ENABLED(CONFIG_KVM)
  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 void kvm_vcpu_pmu_resync_el0(void);
  78
  79 #define kvm_vcpu_has_pmu(vcpu)                                  \
  80         (test_bit(KVM_ARM_VCPU_PMU_V3, (vcpu)->arch.features))
  81
  82 /*
  83  * Updates the vcpu's view of the pmu events for this cpu.
  84  * Must be called before every vcpu run after disabling interrupts, to ensure
  85  * that an interrupt cannot fire and update the structure.
  86  */
  87 #define kvm_pmu_update_vcpu_events(vcpu)                                \
  88         do {                                                            \
  89                 if (!has_vhe() && kvm_vcpu_has_pmu(vcpu))               \
  90                         vcpu->arch.pmu.events = *kvm_get_pmu_events();  \
  91         } while (0)
  92
  93 /*
  94  * Evaluates as true when emulating PMUv3p5, and false otherwise.
  95  */
  96 #define kvm_pmu_is_3p5(vcpu) ({                                         \
  97         u64 val = IDREG(vcpu->kvm, SYS_ID_AA64DFR0_EL1);                \
  98         u8 pmuver = SYS_FIELD_GET(ID_AA64DFR0_EL1, PMUVer, val);        \
  99                                                                         \
 100         pmuver >= ID_AA64DFR0_EL1_PMUVer_V3P5;                          \
 101 })
 102
 103 u8 kvm_arm_pmu_get_pmuver_limit(void);
 104
 105 #else
 106 struct kvm_pmu {
 107 };
 108
 109 static inline bool kvm_arm_support_pmu_v3(void)
 110 {
 111         return false;
 112 }
 113
 114 #define kvm_arm_pmu_irq_initialized(v)  (false)
 115 static inline u64 kvm_pmu_get_counter_value(struct kvm_vcpu *vcpu,
 116                                             u64 select_idx)
 117 {
 118         return 0;
 119 }
 120 static inline void kvm_pmu_set_counter_value(struct kvm_vcpu *vcpu,
 121                                              u64 select_idx, u64 val) {}
 122 static inline u64 kvm_pmu_valid_counter_mask(struct kvm_vcpu *vcpu)
 123 {
 124         return 0;
 125 }
 126 static inline void kvm_pmu_vcpu_init(struct kvm_vcpu *vcpu) {}
 127 static inline void kvm_pmu_vcpu_reset(struct kvm_vcpu *vcpu) {}
 128 static inline void kvm_pmu_vcpu_destroy(struct kvm_vcpu *vcpu) {}
 129 static inline void kvm_pmu_disable_counter_mask(struct kvm_vcpu *vcpu, u64 val) {}
 130 static inline void kvm_pmu_enable_counter_mask(struct kvm_vcpu *vcpu, u64 val) {}
 131 static inline void kvm_pmu_flush_hwstate(struct kvm_vcpu *vcpu) {}
 132 static inline void kvm_pmu_sync_hwstate(struct kvm_vcpu *vcpu) {}
 133 static inline bool kvm_pmu_should_notify_user(struct kvm_vcpu *vcpu)
 134 {
 135         return false;
 136 }
 137 static inline void kvm_pmu_update_run(struct kvm_vcpu *vcpu) {}
 138 static inline void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val) {}
 139 static inline void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val) {}
 140 static inline void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu,
 141                                                   u64 data, u64 select_idx) {}
 142 static inline int kvm_arm_pmu_v3_set_attr(struct kvm_vcpu *vcpu,
 143                                           struct kvm_device_attr *attr)
 144 {
 145         return -ENXIO;
 146 }
 147 static inline int kvm_arm_pmu_v3_get_attr(struct kvm_vcpu *vcpu,
 148                                           struct kvm_device_attr *attr)
 149 {
 150         return -ENXIO;
 151 }
 152 static inline int kvm_arm_pmu_v3_has_attr(struct kvm_vcpu *vcpu,
 153                                           struct kvm_device_attr *attr)
 154 {
 155         return -ENXIO;
 156 }
 157 static inline int kvm_arm_pmu_v3_enable(struct kvm_vcpu *vcpu)
 158 {
 159         return 0;
 160 }
 161 static inline u64 kvm_pmu_get_pmceid(struct kvm_vcpu *vcpu, bool pmceid1)
 162 {
 163         return 0;
 164 }
 165
 166 #define kvm_vcpu_has_pmu(vcpu)          ({ false; })
 167 #define kvm_pmu_is_3p5(vcpu)            ({ false; })
 168 static inline void kvm_pmu_update_vcpu_events(struct kvm_vcpu *vcpu) {}
 169 static inline void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu) {}
 170 static inline void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu) {}
 171 static inline u8 kvm_arm_pmu_get_pmuver_limit(void)
 172 {
 173         return 0;
 174 }
 175 static inline void kvm_vcpu_pmu_resync_el0(void) {}
 176
 177 #endif
 178
 179 #endif