tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
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 */
28struct arm_pmu_platdata {
29 irqreturn_t (*handle_irq)(int irq, void *dev,
30 irq_handler_t pmu_handler);
31};
32
33#ifdef CONFIG_HW_PERF_EVENTS
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. */
55struct 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
80struct arm_pmu {
81 struct pmu pmu;
82 cpumask_t active_irqs;
83 cpumask_t supported_cpus;
84 int *irq_affinity;
85 char *name;
86 irqreturn_t (*handle_irq)(int irq_num, void *dev);
87 void (*enable)(struct perf_event *event);
88 void (*disable)(struct perf_event *event);
89 int (*get_event_idx)(struct pmu_hw_events *hw_events,
90 struct perf_event *event);
91 void (*clear_event_idx)(struct pmu_hw_events *hw_events,
92 struct perf_event *event);
93 int (*set_event_filter)(struct hw_perf_event *evt,
94 struct perf_event_attr *attr);
95 u32 (*read_counter)(struct perf_event *event);
96 void (*write_counter)(struct perf_event *event, u32 val);
97 void (*start)(struct arm_pmu *);
98 void (*stop)(struct arm_pmu *);
99 void (*reset)(void *);
100 int (*request_irq)(struct arm_pmu *, irq_handler_t handler);
101 void (*free_irq)(struct arm_pmu *);
102 int (*map_event)(struct perf_event *event);
103 int num_events;
104 atomic_t active_events;
105 struct mutex reserve_mutex;
106 u64 max_period;
107 struct platform_device *plat_device;
108 struct pmu_hw_events __percpu *hw_events;
109 struct notifier_block hotplug_nb;
110};
111
112#define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu))
113
114int armpmu_register(struct arm_pmu *armpmu, int type);
115
116u64 armpmu_event_update(struct perf_event *event);
117
118int armpmu_event_set_period(struct perf_event *event);
119
120int armpmu_map_event(struct perf_event *event,
121 const unsigned (*event_map)[PERF_COUNT_HW_MAX],
122 const unsigned (*cache_map)[PERF_COUNT_HW_CACHE_MAX]
123 [PERF_COUNT_HW_CACHE_OP_MAX]
124 [PERF_COUNT_HW_CACHE_RESULT_MAX],
125 u32 raw_event_mask);
126
127struct pmu_probe_info {
128 unsigned int cpuid;
129 unsigned int mask;
130 int (*init)(struct arm_pmu *);
131};
132
133#define PMU_PROBE(_cpuid, _mask, _fn) \
134{ \
135 .cpuid = (_cpuid), \
136 .mask = (_mask), \
137 .init = (_fn), \
138}
139
140#define ARM_PMU_PROBE(_cpuid, _fn) \
141 PMU_PROBE(_cpuid, ARM_CPU_PART_MASK, _fn)
142
143#define ARM_PMU_XSCALE_MASK ((0xff << 24) | ARM_CPU_XSCALE_ARCH_MASK)
144
145#define XSCALE_PMU_PROBE(_version, _fn) \
146 PMU_PROBE(ARM_CPU_IMP_INTEL << 24 | _version, ARM_PMU_XSCALE_MASK, _fn)
147
148int arm_pmu_device_probe(struct platform_device *pdev,
149 const struct of_device_id *of_table,
150 const struct pmu_probe_info *probe_table);
151
152#endif /* CONFIG_HW_PERF_EVENTS */
153
154#endif /* __ARM_PMU_H__ */