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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> | |
eb2b8618 | 17 | #include <asm/perf_counter.h> |
0793a61d TG |
18 | |
19 | #include <linux/list.h> | |
20 | #include <linux/mutex.h> | |
21 | #include <linux/rculist.h> | |
22 | #include <linux/rcupdate.h> | |
23 | #include <linux/spinlock.h> | |
24 | ||
25 | struct task_struct; | |
26 | ||
27 | /* | |
9f66a381 IM |
28 | * User-space ABI bits: |
29 | */ | |
30 | ||
31 | /* | |
32 | * Generalized performance counter event types, used by the hw_event.type | |
33 | * parameter of the sys_perf_counter_open() syscall: | |
0793a61d TG |
34 | */ |
35 | enum hw_event_types { | |
0793a61d | 36 | /* |
9f66a381 | 37 | * Common hardware events, generalized by the kernel: |
0793a61d | 38 | */ |
9f66a381 IM |
39 | PERF_COUNT_CYCLES = 0, |
40 | PERF_COUNT_INSTRUCTIONS = 1, | |
41 | PERF_COUNT_CACHE_REFERENCES = 2, | |
42 | PERF_COUNT_CACHE_MISSES = 3, | |
43 | PERF_COUNT_BRANCH_INSTRUCTIONS = 4, | |
44 | PERF_COUNT_BRANCH_MISSES = 5, | |
45 | ||
6c594c21 IM |
46 | PERF_HW_EVENTS_MAX = 6, |
47 | ||
9f66a381 IM |
48 | /* |
49 | * Special "software" counters provided by the kernel, even if | |
50 | * the hardware does not support performance counters. These | |
51 | * counters measure various physical and sw events of the | |
52 | * kernel (and allow the profiling of them as well): | |
53 | */ | |
54 | PERF_COUNT_CPU_CLOCK = -1, | |
55 | PERF_COUNT_TASK_CLOCK = -2, | |
5d6a27d8 IM |
56 | PERF_COUNT_PAGE_FAULTS = -3, |
57 | PERF_COUNT_CONTEXT_SWITCHES = -4, | |
6c594c21 IM |
58 | PERF_COUNT_CPU_MIGRATIONS = -5, |
59 | ||
60 | PERF_SW_EVENTS_MIN = -6, | |
0793a61d TG |
61 | }; |
62 | ||
63 | /* | |
64 | * IRQ-notification data record type: | |
65 | */ | |
9f66a381 IM |
66 | enum perf_counter_record_type { |
67 | PERF_RECORD_SIMPLE = 0, | |
68 | PERF_RECORD_IRQ = 1, | |
69 | PERF_RECORD_GROUP = 2, | |
0793a61d TG |
70 | }; |
71 | ||
9f66a381 IM |
72 | /* |
73 | * Hardware event to monitor via a performance monitoring counter: | |
74 | */ | |
75 | struct perf_counter_hw_event { | |
01b2838c | 76 | s64 type; |
9f66a381 IM |
77 | |
78 | u64 irq_period; | |
79 | u32 record_type; | |
80 | ||
9b51f66d IM |
81 | u32 disabled : 1, /* off by default */ |
82 | nmi : 1, /* NMI sampling */ | |
83 | raw : 1, /* raw event type */ | |
84 | inherit : 1, /* children inherit it */ | |
85 | __reserved_1 : 28; | |
9f66a381 IM |
86 | |
87 | u64 __reserved_2; | |
eab656ae TG |
88 | }; |
89 | ||
9f66a381 IM |
90 | /* |
91 | * Kernel-internal data types: | |
92 | */ | |
93 | ||
0793a61d | 94 | /** |
9f66a381 | 95 | * struct hw_perf_counter - performance counter hardware details: |
0793a61d TG |
96 | */ |
97 | struct hw_perf_counter { | |
ee06094f | 98 | #ifdef CONFIG_PERF_COUNTERS |
9f66a381 IM |
99 | u64 config; |
100 | unsigned long config_base; | |
101 | unsigned long counter_base; | |
102 | int nmi; | |
103 | unsigned int idx; | |
ee06094f | 104 | atomic64_t prev_count; |
9f66a381 | 105 | u64 irq_period; |
ee06094f IM |
106 | atomic64_t period_left; |
107 | #endif | |
0793a61d TG |
108 | }; |
109 | ||
110 | /* | |
111 | * Hardcoded buffer length limit for now, for IRQ-fed events: | |
112 | */ | |
9f66a381 | 113 | #define PERF_DATA_BUFLEN 2048 |
0793a61d TG |
114 | |
115 | /** | |
116 | * struct perf_data - performance counter IRQ data sampling ... | |
117 | */ | |
118 | struct perf_data { | |
9f66a381 IM |
119 | int len; |
120 | int rd_idx; | |
121 | int overrun; | |
122 | u8 data[PERF_DATA_BUFLEN]; | |
0793a61d TG |
123 | }; |
124 | ||
621a01ea IM |
125 | struct perf_counter; |
126 | ||
127 | /** | |
128 | * struct hw_perf_counter_ops - performance counter hw ops | |
129 | */ | |
130 | struct hw_perf_counter_ops { | |
7671581f IM |
131 | void (*enable) (struct perf_counter *counter); |
132 | void (*disable) (struct perf_counter *counter); | |
133 | void (*read) (struct perf_counter *counter); | |
621a01ea IM |
134 | }; |
135 | ||
6a930700 IM |
136 | /** |
137 | * enum perf_counter_active_state - the states of a counter | |
138 | */ | |
139 | enum perf_counter_active_state { | |
140 | PERF_COUNTER_STATE_OFF = -1, | |
141 | PERF_COUNTER_STATE_INACTIVE = 0, | |
142 | PERF_COUNTER_STATE_ACTIVE = 1, | |
143 | }; | |
144 | ||
9b51f66d IM |
145 | struct file; |
146 | ||
0793a61d TG |
147 | /** |
148 | * struct perf_counter - performance counter kernel representation: | |
149 | */ | |
150 | struct perf_counter { | |
ee06094f | 151 | #ifdef CONFIG_PERF_COUNTERS |
04289bb9 IM |
152 | struct list_head list_entry; |
153 | struct list_head sibling_list; | |
154 | struct perf_counter *group_leader; | |
5c92d124 | 155 | const struct hw_perf_counter_ops *hw_ops; |
04289bb9 | 156 | |
6a930700 | 157 | enum perf_counter_active_state state; |
0793a61d | 158 | atomic64_t count; |
ee06094f | 159 | |
9f66a381 | 160 | struct perf_counter_hw_event hw_event; |
0793a61d TG |
161 | struct hw_perf_counter hw; |
162 | ||
163 | struct perf_counter_context *ctx; | |
164 | struct task_struct *task; | |
9b51f66d | 165 | struct file *filp; |
0793a61d | 166 | |
9b51f66d IM |
167 | unsigned int nr_inherited; |
168 | struct perf_counter *parent; | |
0793a61d TG |
169 | /* |
170 | * Protect attach/detach: | |
171 | */ | |
172 | struct mutex mutex; | |
173 | ||
174 | int oncpu; | |
175 | int cpu; | |
176 | ||
0793a61d TG |
177 | /* read() / irq related data */ |
178 | wait_queue_head_t waitq; | |
179 | /* optional: for NMIs */ | |
180 | int wakeup_pending; | |
181 | struct perf_data *irqdata; | |
182 | struct perf_data *usrdata; | |
183 | struct perf_data data[2]; | |
ee06094f | 184 | #endif |
0793a61d TG |
185 | }; |
186 | ||
187 | /** | |
188 | * struct perf_counter_context - counter context structure | |
189 | * | |
190 | * Used as a container for task counters and CPU counters as well: | |
191 | */ | |
192 | struct perf_counter_context { | |
193 | #ifdef CONFIG_PERF_COUNTERS | |
194 | /* | |
195 | * Protect the list of counters: | |
196 | */ | |
197 | spinlock_t lock; | |
04289bb9 IM |
198 | |
199 | struct list_head counter_list; | |
0793a61d TG |
200 | int nr_counters; |
201 | int nr_active; | |
202 | struct task_struct *task; | |
203 | #endif | |
204 | }; | |
205 | ||
206 | /** | |
207 | * struct perf_counter_cpu_context - per cpu counter context structure | |
208 | */ | |
209 | struct perf_cpu_context { | |
210 | struct perf_counter_context ctx; | |
211 | struct perf_counter_context *task_ctx; | |
212 | int active_oncpu; | |
213 | int max_pertask; | |
214 | }; | |
215 | ||
216 | /* | |
217 | * Set by architecture code: | |
218 | */ | |
219 | extern int perf_max_counters; | |
220 | ||
221 | #ifdef CONFIG_PERF_COUNTERS | |
5c92d124 | 222 | extern const struct hw_perf_counter_ops * |
621a01ea IM |
223 | hw_perf_counter_init(struct perf_counter *counter); |
224 | ||
0793a61d TG |
225 | extern void perf_counter_task_sched_in(struct task_struct *task, int cpu); |
226 | extern void perf_counter_task_sched_out(struct task_struct *task, int cpu); | |
227 | extern void perf_counter_task_tick(struct task_struct *task, int cpu); | |
9b51f66d IM |
228 | extern void perf_counter_init_task(struct task_struct *child); |
229 | extern void perf_counter_exit_task(struct task_struct *child); | |
0793a61d TG |
230 | extern void perf_counter_notify(struct pt_regs *regs); |
231 | extern void perf_counter_print_debug(void); | |
01b2838c IM |
232 | extern u64 hw_perf_save_disable(void); |
233 | extern void hw_perf_restore(u64 ctrl); | |
1d1c7ddb IM |
234 | extern int perf_counter_task_disable(void); |
235 | extern int perf_counter_task_enable(void); | |
5c92d124 | 236 | |
0793a61d TG |
237 | #else |
238 | static inline void | |
239 | perf_counter_task_sched_in(struct task_struct *task, int cpu) { } | |
240 | static inline void | |
241 | perf_counter_task_sched_out(struct task_struct *task, int cpu) { } | |
242 | static inline void | |
243 | perf_counter_task_tick(struct task_struct *task, int cpu) { } | |
9b51f66d IM |
244 | static inline void perf_counter_init_task(struct task_struct *child) { } |
245 | static inline void perf_counter_exit_task(struct task_struct *child) { } | |
0793a61d TG |
246 | static inline void perf_counter_notify(struct pt_regs *regs) { } |
247 | static inline void perf_counter_print_debug(void) { } | |
01b2838c IM |
248 | static inline void hw_perf_restore(u64 ctrl) { } |
249 | static inline u64 hw_perf_save_disable(void) { return 0; } | |
1d1c7ddb IM |
250 | static inline int perf_counter_task_disable(void) { return -EINVAL; } |
251 | static inline int perf_counter_task_enable(void) { return -EINVAL; } | |
0793a61d TG |
252 | #endif |
253 | ||
254 | #endif /* _LINUX_PERF_COUNTER_H */ |