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 KVM_ARMV8_PMU_MAX_COUNTERS	32
 14
 15#if IS_ENABLED(CONFIG_HW_PERF_EVENTS) && IS_ENABLED(CONFIG_KVM)
 16struct kvm_pmc {
 17	u8 idx;	/* index into the pmu->pmc array */
 18	struct perf_event *perf_event;
 19};
 20
 21struct kvm_pmu_events {
 22	u64 events_host;
 23	u64 events_guest;
 24};
 25
 26struct kvm_pmu {
 27	struct irq_work overflow_work;
 28	struct kvm_pmu_events events;
 29	struct kvm_pmc pmc[KVM_ARMV8_PMU_MAX_COUNTERS];
 30	int irq_num;
 31	bool created;
 32	bool irq_level;
 33};
 34
 35struct arm_pmu_entry {
 36	struct list_head entry;
 37	struct arm_pmu *arm_pmu;
 38};
 39
 40bool kvm_supports_guest_pmuv3(void);
 41#define kvm_arm_pmu_irq_initialized(v)	((v)->arch.pmu.irq_num >= VGIC_NR_SGIS)
 42u64 kvm_pmu_get_counter_value(struct kvm_vcpu *vcpu, u64 select_idx);
 43void kvm_pmu_set_counter_value(struct kvm_vcpu *vcpu, u64 select_idx, u64 val);
 44void kvm_pmu_set_counter_value_user(struct kvm_vcpu *vcpu, u64 select_idx, u64 val);
 45u64 kvm_pmu_implemented_counter_mask(struct kvm_vcpu *vcpu);
 46u64 kvm_pmu_accessible_counter_mask(struct kvm_vcpu *vcpu);
 47u64 kvm_pmu_get_pmceid(struct kvm_vcpu *vcpu, bool pmceid1);
 48void kvm_pmu_vcpu_init(struct kvm_vcpu *vcpu);
 49void kvm_pmu_vcpu_destroy(struct kvm_vcpu *vcpu);
 50void kvm_pmu_reprogram_counter_mask(struct kvm_vcpu *vcpu, u64 val);
 51void kvm_pmu_flush_hwstate(struct kvm_vcpu *vcpu);
 52void kvm_pmu_sync_hwstate(struct kvm_vcpu *vcpu);
 53bool kvm_pmu_should_notify_user(struct kvm_vcpu *vcpu);
 54void kvm_pmu_update_run(struct kvm_vcpu *vcpu);
 55void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val);
 56void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val);
 57void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, u64 data,
 58				    u64 select_idx);
 59void kvm_vcpu_reload_pmu(struct kvm_vcpu *vcpu);
 60int kvm_arm_pmu_v3_set_attr(struct kvm_vcpu *vcpu,
 61			    struct kvm_device_attr *attr);
 62int kvm_arm_pmu_v3_get_attr(struct kvm_vcpu *vcpu,
 63			    struct kvm_device_attr *attr);
 64int kvm_arm_pmu_v3_has_attr(struct kvm_vcpu *vcpu,
 65			    struct kvm_device_attr *attr);
 66int kvm_arm_pmu_v3_enable(struct kvm_vcpu *vcpu);
 67
 68struct kvm_pmu_events *kvm_get_pmu_events(void);
 69void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu);
 70void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu);
 71void kvm_vcpu_pmu_resync_el0(void);
 72
 73#define kvm_vcpu_has_pmu(vcpu)					\
 74	(vcpu_has_feature(vcpu, KVM_ARM_VCPU_PMU_V3))
 75
 76/*
 77 * Updates the vcpu's view of the pmu events for this cpu.
 78 * Must be called before every vcpu run after disabling interrupts, to ensure
 79 * that an interrupt cannot fire and update the structure.
 80 */
 81#define kvm_pmu_update_vcpu_events(vcpu)				\
 82	do {								\
 83		if (!has_vhe() && system_supports_pmuv3())		\
 84			vcpu->arch.pmu.events = *kvm_get_pmu_events();	\
 85	} while (0)
 86
 87u8 kvm_arm_pmu_get_pmuver_limit(void);
 88u64 kvm_pmu_evtyper_mask(struct kvm *kvm);
 89int kvm_arm_set_default_pmu(struct kvm *kvm);
 90u8 kvm_arm_pmu_get_max_counters(struct kvm *kvm);
 91
 92u64 kvm_vcpu_read_pmcr(struct kvm_vcpu *vcpu);
 93bool kvm_pmu_counter_is_hyp(struct kvm_vcpu *vcpu, unsigned int idx);
 94void kvm_pmu_nested_transition(struct kvm_vcpu *vcpu);
 95#else
 96struct kvm_pmu {
 97};
 98
 99static inline bool kvm_supports_guest_pmuv3(void)
100{
101	return false;
102}
103
104#define kvm_arm_pmu_irq_initialized(v)	(false)
105static inline u64 kvm_pmu_get_counter_value(struct kvm_vcpu *vcpu,
106					    u64 select_idx)
107{
108	return 0;
109}
110static inline void kvm_pmu_set_counter_value(struct kvm_vcpu *vcpu,
111					     u64 select_idx, u64 val) {}
112static inline void kvm_pmu_set_counter_value_user(struct kvm_vcpu *vcpu,
113						  u64 select_idx, u64 val) {}
114static inline u64 kvm_pmu_implemented_counter_mask(struct kvm_vcpu *vcpu)
115{
116	return 0;
117}
118static inline u64 kvm_pmu_accessible_counter_mask(struct kvm_vcpu *vcpu)
119{
120	return 0;
121}
122static inline void kvm_pmu_vcpu_init(struct kvm_vcpu *vcpu) {}
123static inline void kvm_pmu_vcpu_destroy(struct kvm_vcpu *vcpu) {}
124static inline void kvm_pmu_reprogram_counter_mask(struct kvm_vcpu *vcpu, u64 val) {}
125static inline void kvm_pmu_flush_hwstate(struct kvm_vcpu *vcpu) {}
126static inline void kvm_pmu_sync_hwstate(struct kvm_vcpu *vcpu) {}
127static inline bool kvm_pmu_should_notify_user(struct kvm_vcpu *vcpu)
128{
129	return false;
130}
131static inline void kvm_pmu_update_run(struct kvm_vcpu *vcpu) {}
132static inline void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val) {}
133static inline void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val) {}
134static inline void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu,
135						  u64 data, u64 select_idx) {}
136static inline int kvm_arm_pmu_v3_set_attr(struct kvm_vcpu *vcpu,
137					  struct kvm_device_attr *attr)
138{
139	return -ENXIO;
140}
141static inline int kvm_arm_pmu_v3_get_attr(struct kvm_vcpu *vcpu,
142					  struct kvm_device_attr *attr)
143{
144	return -ENXIO;
145}
146static inline int kvm_arm_pmu_v3_has_attr(struct kvm_vcpu *vcpu,
147					  struct kvm_device_attr *attr)
148{
149	return -ENXIO;
150}
151static inline int kvm_arm_pmu_v3_enable(struct kvm_vcpu *vcpu)
152{
153	return 0;
154}
155static inline u64 kvm_pmu_get_pmceid(struct kvm_vcpu *vcpu, bool pmceid1)
156{
157	return 0;
158}
159
160#define kvm_vcpu_has_pmu(vcpu)		({ false; })
161static inline void kvm_pmu_update_vcpu_events(struct kvm_vcpu *vcpu) {}
162static inline void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu) {}
163static inline void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu) {}
164static inline void kvm_vcpu_reload_pmu(struct kvm_vcpu *vcpu) {}
165static inline u8 kvm_arm_pmu_get_pmuver_limit(void)
166{
167	return 0;
168}
169static inline u64 kvm_pmu_evtyper_mask(struct kvm *kvm)
170{
171	return 0;
172}
173static inline void kvm_vcpu_pmu_resync_el0(void) {}
174
175static inline int kvm_arm_set_default_pmu(struct kvm *kvm)
176{
177	return -ENODEV;
178}
179
180static inline u8 kvm_arm_pmu_get_max_counters(struct kvm *kvm)
181{
182	return 0;
183}
184
185static inline u64 kvm_vcpu_read_pmcr(struct kvm_vcpu *vcpu)
186{
187	return 0;
188}
189
190static inline bool kvm_pmu_counter_is_hyp(struct kvm_vcpu *vcpu, unsigned int idx)
191{
192	return false;
193}
194
195static inline void kvm_pmu_nested_transition(struct kvm_vcpu *vcpu) {}
196
197#endif
198
199#endif