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
15struct drm_i915_private;
16struct intel_gt;
17
18/*
19 * Non-engine events that we need to track enabled-disabled transition and
20 * current state.
21 */
22enum i915_pmu_tracked_events {
23 __I915_PMU_ACTUAL_FREQUENCY_ENABLED = 0,
24 __I915_PMU_REQUESTED_FREQUENCY_ENABLED,
25 __I915_PMU_RC6_RESIDENCY_ENABLED,
26 __I915_PMU_TRACKED_EVENT_COUNT, /* count marker */
27};
28
29/*
30 * Slots used from the sampling timer (non-engine events) with some extras for
31 * convenience.
32 */
33enum {
34 __I915_SAMPLE_FREQ_ACT = 0,
35 __I915_SAMPLE_FREQ_REQ,
36 __I915_SAMPLE_RC6,
37 __I915_SAMPLE_RC6_LAST_REPORTED,
38 __I915_NUM_PMU_SAMPLERS
39};
40
41#define I915_PMU_MAX_GT 2
42
43/*
44 * How many different events we track in the global PMU mask.
45 *
46 * It is also used to know to needed number of event reference counters.
47 */
48#define I915_PMU_MASK_BITS \
49 (I915_ENGINE_SAMPLE_COUNT + \
50 I915_PMU_MAX_GT * __I915_PMU_TRACKED_EVENT_COUNT)
51
52#define I915_ENGINE_SAMPLE_COUNT (I915_SAMPLE_SEMA + 1)
53
54struct i915_pmu_sample {
55 u64 cur;
56};
57
58struct i915_pmu {
59 /**
60 * @cpuhp: Struct used for CPU hotplug handling.
61 */
62 struct {
63 struct hlist_node node;
64 unsigned int cpu;
65 } cpuhp;
66 /**
67 * @base: PMU base.
68 */
69 struct pmu base;
70 /**
71 * @closed: i915 is unregistering.
72 */
73 bool closed;
74 /**
75 * @name: Name as registered with perf core.
76 */
77 const char *name;
78 /**
79 * @lock: Lock protecting enable mask and ref count handling.
80 */
81 spinlock_t lock;
82 /**
83 * @unparked: GT unparked mask.
84 */
85 unsigned int unparked;
86 /**
87 * @timer: Timer for internal i915 PMU sampling.
88 */
89 struct hrtimer timer;
90 /**
91 * @enable: Bitmask of specific enabled events.
92 *
93 * For some events we need to track their state and do some internal
94 * house keeping.
95 *
96 * Each engine event sampler type and event listed in enum
97 * i915_pmu_tracked_events gets a bit in this field.
98 *
99 * Low bits are engine samplers and other events continue from there.
100 */
101 u32 enable;
102
103 /**
104 * @timer_last:
105 *
106 * Timestmap of the previous timer invocation.
107 */
108 ktime_t timer_last;
109
110 /**
111 * @enable_count: Reference counts for the enabled events.
112 *
113 * Array indices are mapped in the same way as bits in the @enable field
114 * and they are used to control sampling on/off when multiple clients
115 * are using the PMU API.
116 */
117 unsigned int enable_count[I915_PMU_MASK_BITS];
118 /**
119 * @timer_enabled: Should the internal sampling timer be running.
120 */
121 bool timer_enabled;
122 /**
123 * @sample: Current and previous (raw) counters for sampling events.
124 *
125 * These counters are updated from the i915 PMU sampling timer.
126 *
127 * Only global counters are held here, while the per-engine ones are in
128 * struct intel_engine_cs.
129 */
130 struct i915_pmu_sample sample[I915_PMU_MAX_GT][__I915_NUM_PMU_SAMPLERS];
131 /**
132 * @sleep_last: Last time GT parked for RC6 estimation.
133 */
134 ktime_t sleep_last[I915_PMU_MAX_GT];
135 /**
136 * @irq_count: Number of interrupts
137 *
138 * Intentionally unsigned long to avoid atomics or heuristics on 32bit.
139 * 4e9 interrupts are a lot and postprocessing can really deal with an
140 * occasional wraparound easily. It's 32bit after all.
141 */
142 unsigned long irq_count;
143 /**
144 * @events_attr_group: Device events attribute group.
145 */
146 struct attribute_group events_attr_group;
147 /**
148 * @i915_attr: Memory block holding device attributes.
149 */
150 void *i915_attr;
151 /**
152 * @pmu_attr: Memory block holding device attributes.
153 */
154 void *pmu_attr;
155};
156
157#ifdef CONFIG_PERF_EVENTS
158int i915_pmu_init(void);
159void i915_pmu_exit(void);
160void i915_pmu_register(struct drm_i915_private *i915);
161void i915_pmu_unregister(struct drm_i915_private *i915);
162void i915_pmu_gt_parked(struct intel_gt *gt);
163void i915_pmu_gt_unparked(struct intel_gt *gt);
164#else
165static inline int i915_pmu_init(void) { return 0; }
166static inline void i915_pmu_exit(void) {}
167static inline void i915_pmu_register(struct drm_i915_private *i915) {}
168static inline void i915_pmu_unregister(struct drm_i915_private *i915) {}
169static inline void i915_pmu_gt_parked(struct intel_gt *gt) {}
170static inline void i915_pmu_gt_unparked(struct intel_gt *gt) {}
171#endif
172
173#endif
174

source code of linux/drivers/gpu/drm/i915/i915_pmu.h