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0793a61d TG |
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 | /* | |
9f66a381 IM |
27 | * User-space ABI bits: |
28 | */ | |
29 | ||
30 | /* | |
31 | * Generalized performance counter event types, used by the hw_event.type | |
32 | * parameter of the sys_perf_counter_open() syscall: | |
0793a61d TG |
33 | */ |
34 | enum hw_event_types { | |
0793a61d | 35 | /* |
9f66a381 | 36 | * Common hardware events, generalized by the kernel: |
0793a61d | 37 | */ |
9f66a381 IM |
38 | PERF_COUNT_CYCLES = 0, |
39 | PERF_COUNT_INSTRUCTIONS = 1, | |
40 | PERF_COUNT_CACHE_REFERENCES = 2, | |
41 | PERF_COUNT_CACHE_MISSES = 3, | |
42 | PERF_COUNT_BRANCH_INSTRUCTIONS = 4, | |
43 | PERF_COUNT_BRANCH_MISSES = 5, | |
44 | ||
45 | /* | |
46 | * Special "software" counters provided by the kernel, even if | |
47 | * the hardware does not support performance counters. These | |
48 | * counters measure various physical and sw events of the | |
49 | * kernel (and allow the profiling of them as well): | |
50 | */ | |
51 | PERF_COUNT_CPU_CLOCK = -1, | |
52 | PERF_COUNT_TASK_CLOCK = -2, | |
bae43c99 IM |
53 | /* |
54 | * Future software events: | |
55 | */ | |
56 | /* PERF_COUNT_PAGE_FAULTS = -3, | |
57 | PERF_COUNT_CONTEXT_SWITCHES = -4, */ | |
0793a61d TG |
58 | }; |
59 | ||
60 | /* | |
61 | * IRQ-notification data record type: | |
62 | */ | |
9f66a381 IM |
63 | enum perf_counter_record_type { |
64 | PERF_RECORD_SIMPLE = 0, | |
65 | PERF_RECORD_IRQ = 1, | |
66 | PERF_RECORD_GROUP = 2, | |
0793a61d TG |
67 | }; |
68 | ||
9f66a381 IM |
69 | /* |
70 | * Hardware event to monitor via a performance monitoring counter: | |
71 | */ | |
72 | struct perf_counter_hw_event { | |
01b2838c | 73 | s64 type; |
9f66a381 IM |
74 | |
75 | u64 irq_period; | |
76 | u32 record_type; | |
77 | ||
78 | u32 disabled : 1, /* off by default */ | |
79 | nmi : 1, /* NMI sampling */ | |
80 | raw : 1, /* raw event type */ | |
81 | __reserved_1 : 29; | |
82 | ||
83 | u64 __reserved_2; | |
eab656ae TG |
84 | }; |
85 | ||
9f66a381 IM |
86 | /* |
87 | * Kernel-internal data types: | |
88 | */ | |
89 | ||
0793a61d | 90 | /** |
9f66a381 | 91 | * struct hw_perf_counter - performance counter hardware details: |
0793a61d TG |
92 | */ |
93 | struct hw_perf_counter { | |
ee06094f | 94 | #ifdef CONFIG_PERF_COUNTERS |
9f66a381 IM |
95 | u64 config; |
96 | unsigned long config_base; | |
97 | unsigned long counter_base; | |
98 | int nmi; | |
99 | unsigned int idx; | |
ee06094f | 100 | atomic64_t prev_count; |
9f66a381 | 101 | u64 irq_period; |
ee06094f IM |
102 | atomic64_t period_left; |
103 | #endif | |
0793a61d TG |
104 | }; |
105 | ||
106 | /* | |
107 | * Hardcoded buffer length limit for now, for IRQ-fed events: | |
108 | */ | |
9f66a381 | 109 | #define PERF_DATA_BUFLEN 2048 |
0793a61d TG |
110 | |
111 | /** | |
112 | * struct perf_data - performance counter IRQ data sampling ... | |
113 | */ | |
114 | struct perf_data { | |
9f66a381 IM |
115 | int len; |
116 | int rd_idx; | |
117 | int overrun; | |
118 | u8 data[PERF_DATA_BUFLEN]; | |
0793a61d TG |
119 | }; |
120 | ||
621a01ea IM |
121 | struct perf_counter; |
122 | ||
123 | /** | |
124 | * struct hw_perf_counter_ops - performance counter hw ops | |
125 | */ | |
126 | struct hw_perf_counter_ops { | |
127 | void (*hw_perf_counter_enable) (struct perf_counter *counter); | |
128 | void (*hw_perf_counter_disable) (struct perf_counter *counter); | |
129 | void (*hw_perf_counter_read) (struct perf_counter *counter); | |
130 | }; | |
131 | ||
6a930700 IM |
132 | /** |
133 | * enum perf_counter_active_state - the states of a counter | |
134 | */ | |
135 | enum perf_counter_active_state { | |
136 | PERF_COUNTER_STATE_OFF = -1, | |
137 | PERF_COUNTER_STATE_INACTIVE = 0, | |
138 | PERF_COUNTER_STATE_ACTIVE = 1, | |
139 | }; | |
140 | ||
0793a61d TG |
141 | /** |
142 | * struct perf_counter - performance counter kernel representation: | |
143 | */ | |
144 | struct perf_counter { | |
ee06094f | 145 | #ifdef CONFIG_PERF_COUNTERS |
04289bb9 IM |
146 | struct list_head list_entry; |
147 | struct list_head sibling_list; | |
148 | struct perf_counter *group_leader; | |
5c92d124 | 149 | const struct hw_perf_counter_ops *hw_ops; |
04289bb9 | 150 | |
6a930700 | 151 | enum perf_counter_active_state state; |
0793a61d | 152 | atomic64_t count; |
ee06094f | 153 | |
9f66a381 | 154 | struct perf_counter_hw_event hw_event; |
0793a61d TG |
155 | struct hw_perf_counter hw; |
156 | ||
157 | struct perf_counter_context *ctx; | |
158 | struct task_struct *task; | |
159 | ||
160 | /* | |
161 | * Protect attach/detach: | |
162 | */ | |
163 | struct mutex mutex; | |
164 | ||
165 | int oncpu; | |
166 | int cpu; | |
167 | ||
0793a61d TG |
168 | /* read() / irq related data */ |
169 | wait_queue_head_t waitq; | |
170 | /* optional: for NMIs */ | |
171 | int wakeup_pending; | |
172 | struct perf_data *irqdata; | |
173 | struct perf_data *usrdata; | |
174 | struct perf_data data[2]; | |
ee06094f | 175 | #endif |
0793a61d TG |
176 | }; |
177 | ||
178 | /** | |
179 | * struct perf_counter_context - counter context structure | |
180 | * | |
181 | * Used as a container for task counters and CPU counters as well: | |
182 | */ | |
183 | struct perf_counter_context { | |
184 | #ifdef CONFIG_PERF_COUNTERS | |
185 | /* | |
186 | * Protect the list of counters: | |
187 | */ | |
188 | spinlock_t lock; | |
04289bb9 IM |
189 | |
190 | struct list_head counter_list; | |
0793a61d TG |
191 | int nr_counters; |
192 | int nr_active; | |
193 | struct task_struct *task; | |
194 | #endif | |
195 | }; | |
196 | ||
197 | /** | |
198 | * struct perf_counter_cpu_context - per cpu counter context structure | |
199 | */ | |
200 | struct perf_cpu_context { | |
201 | struct perf_counter_context ctx; | |
202 | struct perf_counter_context *task_ctx; | |
203 | int active_oncpu; | |
204 | int max_pertask; | |
205 | }; | |
206 | ||
207 | /* | |
208 | * Set by architecture code: | |
209 | */ | |
210 | extern int perf_max_counters; | |
211 | ||
212 | #ifdef CONFIG_PERF_COUNTERS | |
5c92d124 | 213 | extern const struct hw_perf_counter_ops * |
621a01ea IM |
214 | hw_perf_counter_init(struct perf_counter *counter); |
215 | ||
0793a61d TG |
216 | extern void perf_counter_task_sched_in(struct task_struct *task, int cpu); |
217 | extern void perf_counter_task_sched_out(struct task_struct *task, int cpu); | |
218 | extern void perf_counter_task_tick(struct task_struct *task, int cpu); | |
219 | extern void perf_counter_init_task(struct task_struct *task); | |
220 | extern void perf_counter_notify(struct pt_regs *regs); | |
221 | extern void perf_counter_print_debug(void); | |
01b2838c IM |
222 | extern u64 hw_perf_save_disable(void); |
223 | extern void hw_perf_restore(u64 ctrl); | |
1d1c7ddb IM |
224 | extern int perf_counter_task_disable(void); |
225 | extern int perf_counter_task_enable(void); | |
5c92d124 | 226 | |
0793a61d TG |
227 | #else |
228 | static inline void | |
229 | perf_counter_task_sched_in(struct task_struct *task, int cpu) { } | |
230 | static inline void | |
231 | perf_counter_task_sched_out(struct task_struct *task, int cpu) { } | |
232 | static inline void | |
233 | perf_counter_task_tick(struct task_struct *task, int cpu) { } | |
234 | static inline void perf_counter_init_task(struct task_struct *task) { } | |
235 | static inline void perf_counter_notify(struct pt_regs *regs) { } | |
236 | static inline void perf_counter_print_debug(void) { } | |
01b2838c IM |
237 | static inline void hw_perf_restore(u64 ctrl) { } |
238 | static inline u64 hw_perf_save_disable(void) { return 0; } | |
1d1c7ddb IM |
239 | static inline int perf_counter_task_disable(void) { return -EINVAL; } |
240 | static inline int perf_counter_task_enable(void) { return -EINVAL; } | |
0793a61d TG |
241 | #endif |
242 | ||
243 | #endif /* _LINUX_PERF_COUNTER_H */ |