1 /* 2 * SPDX-License-Identifier: MIT 3 * 4 * Copyright © 2017-2018 Intel Corporation 5 */ 6 7 #ifndef __I915_PMU_H__ 8 #define __I915_PMU_H__ 9 10 #include <linux/hrtimer.h> 11 #include <linux/perf_event.h> 12 #include <linux/spinlock_types.h> 13 #include <uapi/drm/i915_drm.h> 14 15 struct drm_i915_private; 16 17 enum { 18 __I915_SAMPLE_FREQ_ACT = 0, 19 __I915_SAMPLE_FREQ_REQ, 20 __I915_SAMPLE_RC6, 21 __I915_SAMPLE_RC6_LAST_REPORTED, 22 __I915_NUM_PMU_SAMPLERS 23 }; 24 25 /** 26 * How many different events we track in the global PMU mask. 27 * 28 * It is also used to know to needed number of event reference counters. 29 */ 30 #define I915_PMU_MASK_BITS \ 31 ((1 << I915_PMU_SAMPLE_BITS) + \ 32 (I915_PMU_LAST + 1 - __I915_PMU_OTHER(0))) 33 34 #define I915_ENGINE_SAMPLE_COUNT (I915_SAMPLE_SEMA + 1) 35 36 struct i915_pmu_sample { 37 u64 cur; 38 }; 39 40 struct i915_pmu { 41 /** 42 * @cpuhp: Struct used for CPU hotplug handling. 43 */ 44 struct { 45 struct hlist_node node; 46 unsigned int cpu; 47 } cpuhp; 48 /** 49 * @base: PMU base. 50 */ 51 struct pmu base; 52 /** 53 * @closed: i915 is unregistering. 54 */ 55 bool closed; 56 /** 57 * @name: Name as registered with perf core. 58 */ 59 const char *name; 60 /** 61 * @lock: Lock protecting enable mask and ref count handling. 62 */ 63 spinlock_t lock; 64 /** 65 * @timer: Timer for internal i915 PMU sampling. 66 */ 67 struct hrtimer timer; 68 /** 69 * @enable: Bitmask of all currently enabled events. 70 * 71 * Bits are derived from uAPI event numbers in a way that low 16 bits 72 * correspond to engine event _sample_ _type_ (I915_SAMPLE_QUEUED is 73 * bit 0), and higher bits correspond to other events (for instance 74 * I915_PMU_ACTUAL_FREQUENCY is bit 16 etc). 75 * 76 * In other words, low 16 bits are not per engine but per engine 77 * sampler type, while the upper bits are directly mapped to other 78 * event types. 79 */ 80 u64 enable; 81 82 /** 83 * @timer_last: 84 * 85 * Timestmap of the previous timer invocation. 86 */ 87 ktime_t timer_last; 88 89 /** 90 * @enable_count: Reference counts for the enabled events. 91 * 92 * Array indices are mapped in the same way as bits in the @enable field 93 * and they are used to control sampling on/off when multiple clients 94 * are using the PMU API. 95 */ 96 unsigned int enable_count[I915_PMU_MASK_BITS]; 97 /** 98 * @timer_enabled: Should the internal sampling timer be running. 99 */ 100 bool timer_enabled; 101 /** 102 * @sample: Current and previous (raw) counters for sampling events. 103 * 104 * These counters are updated from the i915 PMU sampling timer. 105 * 106 * Only global counters are held here, while the per-engine ones are in 107 * struct intel_engine_cs. 108 */ 109 struct i915_pmu_sample sample[__I915_NUM_PMU_SAMPLERS]; 110 /** 111 * @sleep_last: Last time GT parked for RC6 estimation. 112 */ 113 ktime_t sleep_last; 114 /** 115 * @irq_count: Number of interrupts 116 * 117 * Intentionally unsigned long to avoid atomics or heuristics on 32bit. 118 * 4e9 interrupts are a lot and postprocessing can really deal with an 119 * occasional wraparound easily. It's 32bit after all. 120 */ 121 unsigned long irq_count; 122 /** 123 * @events_attr_group: Device events attribute group. 124 */ 125 struct attribute_group events_attr_group; 126 /** 127 * @i915_attr: Memory block holding device attributes. 128 */ 129 void *i915_attr; 130 /** 131 * @pmu_attr: Memory block holding device attributes. 132 */ 133 void *pmu_attr; 134 }; 135 136 #ifdef CONFIG_PERF_EVENTS 137 void i915_pmu_init(void); 138 void i915_pmu_exit(void); 139 void i915_pmu_register(struct drm_i915_private *i915); 140 void i915_pmu_unregister(struct drm_i915_private *i915); 141 void i915_pmu_gt_parked(struct drm_i915_private *i915); 142 void i915_pmu_gt_unparked(struct drm_i915_private *i915); 143 #else 144 static inline void i915_pmu_init(void) {} 145 static inline void i915_pmu_exit(void) {} 146 static inline void i915_pmu_register(struct drm_i915_private *i915) {} 147 static inline void i915_pmu_unregister(struct drm_i915_private *i915) {} 148 static inline void i915_pmu_gt_parked(struct drm_i915_private *i915) {} 149 static inline void i915_pmu_gt_unparked(struct drm_i915_private *i915) {} 150 #endif 151 152 #endif 153