1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (c) 2023 Rivos Inc
4  *
5  * Authors:
6  *     Atish Patra <atishp@rivosinc.com>
7  */
8 
9 #ifndef __KVM_VCPU_RISCV_PMU_H
10 #define __KVM_VCPU_RISCV_PMU_H
11 
12 #include <linux/perf/riscv_pmu.h>
13 #include <asm/kvm_vcpu_insn.h>
14 #include <asm/sbi.h>
15 
16 #ifdef CONFIG_RISCV_PMU_SBI
17 #define RISCV_KVM_MAX_FW_CTRS	32
18 #define RISCV_KVM_MAX_HW_CTRS	32
19 #define RISCV_KVM_MAX_COUNTERS	(RISCV_KVM_MAX_HW_CTRS + RISCV_KVM_MAX_FW_CTRS)
20 static_assert(RISCV_KVM_MAX_COUNTERS <= 64);
21 
22 struct kvm_fw_event {
23 	/* Current value of the event */
24 	unsigned long value;
25 
26 	/* Event monitoring status */
27 	bool started;
28 };
29 
30 /* Per virtual pmu counter data */
31 struct kvm_pmc {
32 	u8 idx;
33 	struct perf_event *perf_event;
34 	u64 counter_val;
35 	union sbi_pmu_ctr_info cinfo;
36 	/* Event monitoring status */
37 	bool started;
38 	/* Monitoring event ID */
39 	unsigned long event_idx;
40 };
41 
42 /* PMU data structure per vcpu */
43 struct kvm_pmu {
44 	struct kvm_pmc pmc[RISCV_KVM_MAX_COUNTERS];
45 	struct kvm_fw_event fw_event[RISCV_KVM_MAX_FW_CTRS];
46 	/* Number of the virtual firmware counters available */
47 	int num_fw_ctrs;
48 	/* Number of the virtual hardware counters available */
49 	int num_hw_ctrs;
50 	/* A flag to indicate that pmu initialization is done */
51 	bool init_done;
52 	/* Bit map of all the virtual counter used */
53 	DECLARE_BITMAP(pmc_in_use, RISCV_KVM_MAX_COUNTERS);
54 };
55 
56 #define vcpu_to_pmu(vcpu) (&(vcpu)->arch.pmu_context)
57 #define pmu_to_vcpu(pmu)  (container_of((pmu), struct kvm_vcpu, arch.pmu_context))
58 
59 #if defined(CONFIG_32BIT)
60 #define KVM_RISCV_VCPU_HPMCOUNTER_CSR_FUNCS \
61 {.base = CSR_CYCLEH,	.count = 32,	.func = kvm_riscv_vcpu_pmu_read_hpm }, \
62 {.base = CSR_CYCLE,	.count = 32,	.func = kvm_riscv_vcpu_pmu_read_hpm },
63 #else
64 #define KVM_RISCV_VCPU_HPMCOUNTER_CSR_FUNCS \
65 {.base = CSR_CYCLE,	.count = 32,	.func = kvm_riscv_vcpu_pmu_read_hpm },
66 #endif
67 
68 int kvm_riscv_vcpu_pmu_incr_fw(struct kvm_vcpu *vcpu, unsigned long fid);
69 int kvm_riscv_vcpu_pmu_read_hpm(struct kvm_vcpu *vcpu, unsigned int csr_num,
70 				unsigned long *val, unsigned long new_val,
71 				unsigned long wr_mask);
72 
73 int kvm_riscv_vcpu_pmu_num_ctrs(struct kvm_vcpu *vcpu, struct kvm_vcpu_sbi_return *retdata);
74 int kvm_riscv_vcpu_pmu_ctr_info(struct kvm_vcpu *vcpu, unsigned long cidx,
75 				struct kvm_vcpu_sbi_return *retdata);
76 int kvm_riscv_vcpu_pmu_ctr_start(struct kvm_vcpu *vcpu, unsigned long ctr_base,
77 				 unsigned long ctr_mask, unsigned long flags, u64 ival,
78 				 struct kvm_vcpu_sbi_return *retdata);
79 int kvm_riscv_vcpu_pmu_ctr_stop(struct kvm_vcpu *vcpu, unsigned long ctr_base,
80 				unsigned long ctr_mask, unsigned long flags,
81 				struct kvm_vcpu_sbi_return *retdata);
82 int kvm_riscv_vcpu_pmu_ctr_cfg_match(struct kvm_vcpu *vcpu, unsigned long ctr_base,
83 				     unsigned long ctr_mask, unsigned long flags,
84 				     unsigned long eidx, u64 evtdata,
85 				     struct kvm_vcpu_sbi_return *retdata);
86 int kvm_riscv_vcpu_pmu_ctr_read(struct kvm_vcpu *vcpu, unsigned long cidx,
87 				struct kvm_vcpu_sbi_return *retdata);
88 void kvm_riscv_vcpu_pmu_init(struct kvm_vcpu *vcpu);
89 void kvm_riscv_vcpu_pmu_deinit(struct kvm_vcpu *vcpu);
90 void kvm_riscv_vcpu_pmu_reset(struct kvm_vcpu *vcpu);
91 
92 #else
93 struct kvm_pmu {
94 };
95 
96 static inline int kvm_riscv_vcpu_pmu_read_legacy(struct kvm_vcpu *vcpu, unsigned int csr_num,
97 						 unsigned long *val, unsigned long new_val,
98 						 unsigned long wr_mask)
99 {
100 	if (csr_num == CSR_CYCLE || csr_num == CSR_INSTRET) {
101 		*val = 0;
102 		return KVM_INSN_CONTINUE_NEXT_SEPC;
103 	} else {
104 		return KVM_INSN_ILLEGAL_TRAP;
105 	}
106 }
107 
108 #define KVM_RISCV_VCPU_HPMCOUNTER_CSR_FUNCS \
109 {.base = CSR_CYCLE,	.count = 3,	.func = kvm_riscv_vcpu_pmu_read_legacy },
110 
111 static inline void kvm_riscv_vcpu_pmu_init(struct kvm_vcpu *vcpu) {}
112 static inline int kvm_riscv_vcpu_pmu_incr_fw(struct kvm_vcpu *vcpu, unsigned long fid)
113 {
114 	return 0;
115 }
116 
117 static inline void kvm_riscv_vcpu_pmu_deinit(struct kvm_vcpu *vcpu) {}
118 static inline void kvm_riscv_vcpu_pmu_reset(struct kvm_vcpu *vcpu) {}
119 #endif /* CONFIG_RISCV_PMU_SBI */
120 #endif /* !__KVM_VCPU_RISCV_PMU_H */
121