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1 | /* |
2 | * Performance counters: | |
3 | * | |
4 | * Copyright(C) 2008, Thomas Gleixner <tglx@linutronix.de> | |
5 | * Copyright(C) 2008, Red Hat, Inc., Ingo Molnar | |
6 | * | |
7 | * Data type definitions, declarations, prototypes. | |
8 | * | |
9 | * Started by: Thomas Gleixner and Ingo Molnar | |
10 | * | |
11 | * For licencing details see kernel-base/COPYING | |
12 | */ | |
13 | #ifndef _LINUX_PERF_COUNTER_H | |
14 | #define _LINUX_PERF_COUNTER_H | |
15 | ||
16 | #include <asm/atomic.h> | |
17 | ||
18 | #include <linux/list.h> | |
19 | #include <linux/mutex.h> | |
20 | #include <linux/rculist.h> | |
21 | #include <linux/rcupdate.h> | |
22 | #include <linux/spinlock.h> | |
23 | ||
24 | struct task_struct; | |
25 | ||
26 | /* | |
27 | * Generalized hardware event types, used by the hw_event_type parameter | |
28 | * of the sys_perf_counter_open() syscall: | |
29 | */ | |
30 | enum hw_event_types { | |
31 | PERF_COUNT_CYCLES, | |
32 | PERF_COUNT_INSTRUCTIONS, | |
33 | PERF_COUNT_CACHE_REFERENCES, | |
34 | PERF_COUNT_CACHE_MISSES, | |
35 | PERF_COUNT_BRANCH_INSTRUCTIONS, | |
36 | PERF_COUNT_BRANCH_MISSES, | |
37 | /* | |
38 | * If this bit is set in the type, then trigger NMI sampling: | |
39 | */ | |
40 | PERF_COUNT_NMI = (1 << 30), | |
41 | }; | |
42 | ||
43 | /* | |
44 | * IRQ-notification data record type: | |
45 | */ | |
46 | enum perf_record_type { | |
47 | PERF_RECORD_SIMPLE, | |
48 | PERF_RECORD_IRQ, | |
49 | PERF_RECORD_GROUP, | |
50 | }; | |
51 | ||
52 | /** | |
53 | * struct hw_perf_counter - performance counter hardware details | |
54 | */ | |
55 | struct hw_perf_counter { | |
56 | u64 config; | |
57 | unsigned long config_base; | |
58 | unsigned long counter_base; | |
59 | int nmi; | |
60 | unsigned int idx; | |
61 | u64 prev_count; | |
62 | s32 next_count; | |
63 | u64 irq_period; | |
64 | }; | |
65 | ||
66 | /* | |
67 | * Hardcoded buffer length limit for now, for IRQ-fed events: | |
68 | */ | |
69 | #define PERF_DATA_BUFLEN 2048 | |
70 | ||
71 | /** | |
72 | * struct perf_data - performance counter IRQ data sampling ... | |
73 | */ | |
74 | struct perf_data { | |
75 | int len; | |
76 | int rd_idx; | |
77 | int overrun; | |
78 | u8 data[PERF_DATA_BUFLEN]; | |
79 | }; | |
80 | ||
81 | /** | |
82 | * struct perf_counter - performance counter kernel representation: | |
83 | */ | |
84 | struct perf_counter { | |
85 | struct list_head list; | |
86 | int active; | |
87 | #if BITS_PER_LONG == 64 | |
88 | atomic64_t count; | |
89 | #else | |
90 | atomic_t count32[2]; | |
91 | #endif | |
92 | u64 __irq_period; | |
93 | ||
94 | struct hw_perf_counter hw; | |
95 | ||
96 | struct perf_counter_context *ctx; | |
97 | struct task_struct *task; | |
98 | ||
99 | /* | |
100 | * Protect attach/detach: | |
101 | */ | |
102 | struct mutex mutex; | |
103 | ||
104 | int oncpu; | |
105 | int cpu; | |
106 | ||
107 | s32 hw_event_type; | |
108 | enum perf_record_type record_type; | |
109 | ||
110 | /* read() / irq related data */ | |
111 | wait_queue_head_t waitq; | |
112 | /* optional: for NMIs */ | |
113 | int wakeup_pending; | |
114 | struct perf_data *irqdata; | |
115 | struct perf_data *usrdata; | |
116 | struct perf_data data[2]; | |
117 | }; | |
118 | ||
119 | /** | |
120 | * struct perf_counter_context - counter context structure | |
121 | * | |
122 | * Used as a container for task counters and CPU counters as well: | |
123 | */ | |
124 | struct perf_counter_context { | |
125 | #ifdef CONFIG_PERF_COUNTERS | |
126 | /* | |
127 | * Protect the list of counters: | |
128 | */ | |
129 | spinlock_t lock; | |
130 | struct list_head counters; | |
131 | int nr_counters; | |
132 | int nr_active; | |
133 | struct task_struct *task; | |
134 | #endif | |
135 | }; | |
136 | ||
137 | /** | |
138 | * struct perf_counter_cpu_context - per cpu counter context structure | |
139 | */ | |
140 | struct perf_cpu_context { | |
141 | struct perf_counter_context ctx; | |
142 | struct perf_counter_context *task_ctx; | |
143 | int active_oncpu; | |
144 | int max_pertask; | |
145 | }; | |
146 | ||
147 | /* | |
148 | * Set by architecture code: | |
149 | */ | |
150 | extern int perf_max_counters; | |
151 | ||
152 | #ifdef CONFIG_PERF_COUNTERS | |
153 | extern void perf_counter_task_sched_in(struct task_struct *task, int cpu); | |
154 | extern void perf_counter_task_sched_out(struct task_struct *task, int cpu); | |
155 | extern void perf_counter_task_tick(struct task_struct *task, int cpu); | |
156 | extern void perf_counter_init_task(struct task_struct *task); | |
157 | extern void perf_counter_notify(struct pt_regs *regs); | |
158 | extern void perf_counter_print_debug(void); | |
159 | #else | |
160 | static inline void | |
161 | perf_counter_task_sched_in(struct task_struct *task, int cpu) { } | |
162 | static inline void | |
163 | perf_counter_task_sched_out(struct task_struct *task, int cpu) { } | |
164 | static inline void | |
165 | perf_counter_task_tick(struct task_struct *task, int cpu) { } | |
166 | static inline void perf_counter_init_task(struct task_struct *task) { } | |
167 | static inline void perf_counter_notify(struct pt_regs *regs) { } | |
168 | static inline void perf_counter_print_debug(void) { } | |
169 | #endif | |
170 | ||
171 | #endif /* _LINUX_PERF_COUNTER_H */ |