1 /* 2 * linux/arch/arm/include/asm/pmu.h 3 * 4 * Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 */ 11 12 #ifndef __ARM_PMU_H__ 13 #define __ARM_PMU_H__ 14 15 #include <linux/interrupt.h> 16 #include <linux/perf_event.h> 17 #include <linux/sysfs.h> 18 #include <asm/cputype.h> 19 20 /* 21 * struct arm_pmu_platdata - ARM PMU platform data 22 * 23 * @handle_irq: an optional handler which will be called from the 24 * interrupt and passed the address of the low level handler, 25 * and can be used to implement any platform specific handling 26 * before or after calling it. 27 */ 28 struct arm_pmu_platdata { 29 irqreturn_t (*handle_irq)(int irq, void *dev, 30 irq_handler_t pmu_handler); 31 }; 32 33 #ifdef CONFIG_ARM_PMU 34 35 /* 36 * The ARMv7 CPU PMU supports up to 32 event counters. 37 */ 38 #define ARMPMU_MAX_HWEVENTS 32 39 40 #define HW_OP_UNSUPPORTED 0xFFFF 41 #define C(_x) PERF_COUNT_HW_CACHE_##_x 42 #define CACHE_OP_UNSUPPORTED 0xFFFF 43 44 #define PERF_MAP_ALL_UNSUPPORTED \ 45 [0 ... PERF_COUNT_HW_MAX - 1] = HW_OP_UNSUPPORTED 46 47 #define PERF_CACHE_MAP_ALL_UNSUPPORTED \ 48 [0 ... C(MAX) - 1] = { \ 49 [0 ... C(OP_MAX) - 1] = { \ 50 [0 ... C(RESULT_MAX) - 1] = CACHE_OP_UNSUPPORTED, \ 51 }, \ 52 } 53 54 /* The events for a given PMU register set. */ 55 struct pmu_hw_events { 56 /* 57 * The events that are active on the PMU for the given index. 58 */ 59 struct perf_event *events[ARMPMU_MAX_HWEVENTS]; 60 61 /* 62 * A 1 bit for an index indicates that the counter is being used for 63 * an event. A 0 means that the counter can be used. 64 */ 65 DECLARE_BITMAP(used_mask, ARMPMU_MAX_HWEVENTS); 66 67 /* 68 * Hardware lock to serialize accesses to PMU registers. Needed for the 69 * read/modify/write sequences. 70 */ 71 raw_spinlock_t pmu_lock; 72 73 /* 74 * When using percpu IRQs, we need a percpu dev_id. Place it here as we 75 * already have to allocate this struct per cpu. 76 */ 77 struct arm_pmu *percpu_pmu; 78 79 int irq; 80 }; 81 82 enum armpmu_attr_groups { 83 ARMPMU_ATTR_GROUP_COMMON, 84 ARMPMU_ATTR_GROUP_EVENTS, 85 ARMPMU_ATTR_GROUP_FORMATS, 86 ARMPMU_NR_ATTR_GROUPS 87 }; 88 89 struct arm_pmu { 90 struct pmu pmu; 91 cpumask_t active_irqs; 92 cpumask_t supported_cpus; 93 char *name; 94 irqreturn_t (*handle_irq)(int irq_num, void *dev); 95 void (*enable)(struct perf_event *event); 96 void (*disable)(struct perf_event *event); 97 int (*get_event_idx)(struct pmu_hw_events *hw_events, 98 struct perf_event *event); 99 void (*clear_event_idx)(struct pmu_hw_events *hw_events, 100 struct perf_event *event); 101 int (*set_event_filter)(struct hw_perf_event *evt, 102 struct perf_event_attr *attr); 103 u32 (*read_counter)(struct perf_event *event); 104 void (*write_counter)(struct perf_event *event, u32 val); 105 void (*start)(struct arm_pmu *); 106 void (*stop)(struct arm_pmu *); 107 void (*reset)(void *); 108 int (*map_event)(struct perf_event *event); 109 int num_events; 110 u64 max_period; 111 bool secure_access; /* 32-bit ARM only */ 112 #define ARMV8_PMUV3_MAX_COMMON_EVENTS 0x40 113 DECLARE_BITMAP(pmceid_bitmap, ARMV8_PMUV3_MAX_COMMON_EVENTS); 114 struct platform_device *plat_device; 115 struct pmu_hw_events __percpu *hw_events; 116 struct hlist_node node; 117 struct notifier_block cpu_pm_nb; 118 /* the attr_groups array must be NULL-terminated */ 119 const struct attribute_group *attr_groups[ARMPMU_NR_ATTR_GROUPS + 1]; 120 121 /* Only to be used by ACPI probing code */ 122 unsigned long acpi_cpuid; 123 }; 124 125 #define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu)) 126 127 u64 armpmu_event_update(struct perf_event *event); 128 129 int armpmu_event_set_period(struct perf_event *event); 130 131 int armpmu_map_event(struct perf_event *event, 132 const unsigned (*event_map)[PERF_COUNT_HW_MAX], 133 const unsigned (*cache_map)[PERF_COUNT_HW_CACHE_MAX] 134 [PERF_COUNT_HW_CACHE_OP_MAX] 135 [PERF_COUNT_HW_CACHE_RESULT_MAX], 136 u32 raw_event_mask); 137 138 typedef int (*armpmu_init_fn)(struct arm_pmu *); 139 140 struct pmu_probe_info { 141 unsigned int cpuid; 142 unsigned int mask; 143 armpmu_init_fn init; 144 }; 145 146 #define PMU_PROBE(_cpuid, _mask, _fn) \ 147 { \ 148 .cpuid = (_cpuid), \ 149 .mask = (_mask), \ 150 .init = (_fn), \ 151 } 152 153 #define ARM_PMU_PROBE(_cpuid, _fn) \ 154 PMU_PROBE(_cpuid, ARM_CPU_PART_MASK, _fn) 155 156 #define ARM_PMU_XSCALE_MASK ((0xff << 24) | ARM_CPU_XSCALE_ARCH_MASK) 157 158 #define XSCALE_PMU_PROBE(_version, _fn) \ 159 PMU_PROBE(ARM_CPU_IMP_INTEL << 24 | _version, ARM_PMU_XSCALE_MASK, _fn) 160 161 int arm_pmu_device_probe(struct platform_device *pdev, 162 const struct of_device_id *of_table, 163 const struct pmu_probe_info *probe_table); 164 165 #ifdef CONFIG_ACPI 166 int arm_pmu_acpi_probe(armpmu_init_fn init_fn); 167 #else 168 static inline int arm_pmu_acpi_probe(armpmu_init_fn init_fn) { return 0; } 169 #endif 170 171 /* Internal functions only for core arm_pmu code */ 172 struct arm_pmu *armpmu_alloc(void); 173 void armpmu_free(struct arm_pmu *pmu); 174 int armpmu_register(struct arm_pmu *pmu); 175 int armpmu_request_irqs(struct arm_pmu *armpmu); 176 void armpmu_free_irqs(struct arm_pmu *armpmu); 177 int armpmu_request_irq(struct arm_pmu *armpmu, int cpu); 178 void armpmu_free_irq(struct arm_pmu *armpmu, int cpu); 179 180 #define ARMV8_PMU_PDEV_NAME "armv8-pmu" 181 182 #endif /* CONFIG_ARM_PMU */ 183 184 #endif /* __ARM_PMU_H__ */ 185