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
15enum arm_pmu_type {
16 ARM_PMU_DEVICE_CPU = 0,
17 ARM_NUM_PMU_DEVICES,
18};
19
20#ifdef CONFIG_CPU_HAS_PMU
21
22/**
23 * reserve_pmu() - reserve the hardware performance counters
24 *
25 * Reserve the hardware performance counters in the system for exclusive use.
26 * The platform_device for the system is returned on success, ERR_PTR()
27 * encoded error on failure.
28 */
29extern struct platform_device *
30reserve_pmu(enum arm_pmu_type device);
31
32/**
33 * release_pmu() - Relinquish control of the performance counters
34 *
35 * Release the performance counters and allow someone else to use them.
36 * Callers must have disabled the counters and released IRQs before calling
37 * this. The platform_device returned from reserve_pmu() must be passed as
38 * a cookie.
39 */
40extern int
41release_pmu(struct platform_device *pdev);
42
43/**
44 * init_pmu() - Initialise the PMU.
45 *
46 * Initialise the system ready for PMU enabling. This should typically set the
47 * IRQ affinity and nothing else. The users (oprofile/perf events etc) will do
48 * the actual hardware initialisation.
49 */
50extern int
51init_pmu(enum arm_pmu_type device);
52
53#else /* CONFIG_CPU_HAS_PMU */
54
55#include <linux/err.h>
56
57static inline struct platform_device *
58reserve_pmu(enum arm_pmu_type device)
59{
60 return ERR_PTR(-ENODEV);
61}
62
63static inline int
64release_pmu(struct platform_device *pdev)
65{
66 return -ENODEV;
67}
68
69static inline int
70init_pmu(enum arm_pmu_type device)
71{
72 return -ENODEV;
73}
74
75#endif /* CONFIG_CPU_HAS_PMU */
76
77#endif /* __ARM_PMU_H__ */