1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2018 SiFive 4 * Copyright (C) 2018 Andes Technology Corporation 5 * Copyright (C) 2021 Western Digital Corporation or its affiliates. 6 * 7 */ 8 9 #ifndef _RISCV_PMU_H 10 #define _RISCV_PMU_H 11 12 #include <linux/perf_event.h> 13 #include <linux/ptrace.h> 14 #include <linux/interrupt.h> 15 16 #ifdef CONFIG_RISCV_PMU 17 18 /* 19 * The RISCV_MAX_COUNTERS parameter should be specified. 20 */ 21 22 #define RISCV_MAX_COUNTERS 64 23 #define RISCV_OP_UNSUPP (-EOPNOTSUPP) 24 #define RISCV_PMU_SBI_PDEV_NAME "riscv-pmu-sbi" 25 #define RISCV_PMU_LEGACY_PDEV_NAME "riscv-pmu-legacy" 26 27 #define RISCV_PMU_STOP_FLAG_RESET 1 28 29 #define RISCV_PMU_CONFIG1_GUEST_EVENTS 0x1 30 31 struct cpu_hw_events { 32 /* currently enabled events */ 33 int n_events; 34 /* Counter overflow interrupt */ 35 int irq; 36 /* currently enabled events */ 37 struct perf_event *events[RISCV_MAX_COUNTERS]; 38 /* currently enabled hardware counters */ 39 DECLARE_BITMAP(used_hw_ctrs, RISCV_MAX_COUNTERS); 40 /* currently enabled firmware counters */ 41 DECLARE_BITMAP(used_fw_ctrs, RISCV_MAX_COUNTERS); 42 }; 43 44 struct riscv_pmu { 45 struct pmu pmu; 46 char *name; 47 48 irqreturn_t (*handle_irq)(int irq_num, void *dev); 49 50 unsigned long cmask; 51 u64 (*ctr_read)(struct perf_event *event); 52 int (*ctr_get_idx)(struct perf_event *event); 53 int (*ctr_get_width)(int idx); 54 void (*ctr_clear_idx)(struct perf_event *event); 55 void (*ctr_start)(struct perf_event *event, u64 init_val); 56 void (*ctr_stop)(struct perf_event *event, unsigned long flag); 57 int (*event_map)(struct perf_event *event, u64 *config); 58 void (*event_init)(struct perf_event *event); 59 void (*event_mapped)(struct perf_event *event, struct mm_struct *mm); 60 void (*event_unmapped)(struct perf_event *event, struct mm_struct *mm); 61 uint8_t (*csr_index)(struct perf_event *event); 62 63 struct cpu_hw_events __percpu *hw_events; 64 struct hlist_node node; 65 struct notifier_block riscv_pm_nb; 66 }; 67 68 #define to_riscv_pmu(p) (container_of(p, struct riscv_pmu, pmu)) 69 70 void riscv_pmu_start(struct perf_event *event, int flags); 71 void riscv_pmu_stop(struct perf_event *event, int flags); 72 unsigned long riscv_pmu_ctr_read_csr(unsigned long csr); 73 int riscv_pmu_event_set_period(struct perf_event *event); 74 uint64_t riscv_pmu_ctr_get_width_mask(struct perf_event *event); 75 u64 riscv_pmu_event_update(struct perf_event *event); 76 #ifdef CONFIG_RISCV_PMU_LEGACY 77 void riscv_pmu_legacy_skip_init(void); 78 #else 79 static inline void riscv_pmu_legacy_skip_init(void) {}; 80 #endif 81 struct riscv_pmu *riscv_pmu_alloc(void); 82 #ifdef CONFIG_RISCV_PMU_SBI 83 int riscv_pmu_get_hpm_info(u32 *hw_ctr_width, u32 *num_hw_ctr); 84 #endif 85 86 #endif /* CONFIG_RISCV_PMU */ 87 88 #endif /* _RISCV_PMU_H */ 89