Merge remote-tracking branches 'regulator/fix/88pm800', 'regulator/fix/max8973',...
[linux-drm-fsl-dcu.git] / arch / arm / include / asm / pmu.h
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  */
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_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. */
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
80 struct 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
114 int armpmu_register(struct arm_pmu *armpmu, int type);
115
116 u64 armpmu_event_update(struct perf_event *event);
117
118 int armpmu_event_set_period(struct perf_event *event);
119
120 int 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
127 struct 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
148 int 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__ */