2 * Performance counters:
4 * Copyright(C) 2008, Thomas Gleixner <tglx@linutronix.de>
5 * Copyright(C) 2008, Red Hat, Inc., Ingo Molnar
7 * Data type definitions, declarations, prototypes.
9 * Started by: Thomas Gleixner and Ingo Molnar
11 * For licencing details see kernel-base/COPYING
13 #ifndef _LINUX_PERF_COUNTER_H
14 #define _LINUX_PERF_COUNTER_H
16 #include <asm/atomic.h>
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>
27 * User-space ABI bits:
31 * Generalized performance counter event types, used by the hw_event.type
32 * parameter of the sys_perf_counter_open() syscall:
36 * Common hardware events, generalized by the kernel:
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,
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):
51 PERF_COUNT_CPU_CLOCK
= -1,
52 PERF_COUNT_TASK_CLOCK
= -2,
53 PERF_COUNT_PAGE_FAULTS
= -3,
54 PERF_COUNT_CONTEXT_SWITCHES
= -4,
58 * IRQ-notification data record type:
60 enum perf_counter_record_type
{
61 PERF_RECORD_SIMPLE
= 0,
63 PERF_RECORD_GROUP
= 2,
67 * Hardware event to monitor via a performance monitoring counter:
69 struct perf_counter_hw_event
{
75 u32 disabled
: 1, /* off by default */
76 nmi
: 1, /* NMI sampling */
77 raw
: 1, /* raw event type */
84 * Kernel-internal data types:
88 * struct hw_perf_counter - performance counter hardware details:
90 struct hw_perf_counter
{
92 unsigned long config_base
;
93 unsigned long counter_base
;
102 * Hardcoded buffer length limit for now, for IRQ-fed events:
104 #define PERF_DATA_BUFLEN 2048
107 * struct perf_data - performance counter IRQ data sampling ...
113 u8 data
[PERF_DATA_BUFLEN
];
117 * struct perf_counter - performance counter kernel representation:
119 struct perf_counter
{
120 struct list_head list
;
122 #if BITS_PER_LONG == 64
127 struct perf_counter_hw_event hw_event
;
128 struct hw_perf_counter hw
;
130 struct perf_counter_context
*ctx
;
131 struct task_struct
*task
;
134 * Protect attach/detach:
141 /* read() / irq related data */
142 wait_queue_head_t waitq
;
143 /* optional: for NMIs */
145 struct perf_data
*irqdata
;
146 struct perf_data
*usrdata
;
147 struct perf_data data
[2];
151 * struct perf_counter_context - counter context structure
153 * Used as a container for task counters and CPU counters as well:
155 struct perf_counter_context
{
156 #ifdef CONFIG_PERF_COUNTERS
158 * Protect the list of counters:
161 struct list_head counters
;
164 struct task_struct
*task
;
169 * struct perf_counter_cpu_context - per cpu counter context structure
171 struct perf_cpu_context
{
172 struct perf_counter_context ctx
;
173 struct perf_counter_context
*task_ctx
;
179 * Set by architecture code:
181 extern int perf_max_counters
;
183 #ifdef CONFIG_PERF_COUNTERS
184 extern void perf_counter_task_sched_in(struct task_struct
*task
, int cpu
);
185 extern void perf_counter_task_sched_out(struct task_struct
*task
, int cpu
);
186 extern void perf_counter_task_tick(struct task_struct
*task
, int cpu
);
187 extern void perf_counter_init_task(struct task_struct
*task
);
188 extern void perf_counter_notify(struct pt_regs
*regs
);
189 extern void perf_counter_print_debug(void);
190 extern void hw_perf_restore_ctrl(u64 ctrl
);
191 extern u64
hw_perf_disable_all(void);
194 perf_counter_task_sched_in(struct task_struct
*task
, int cpu
) { }
196 perf_counter_task_sched_out(struct task_struct
*task
, int cpu
) { }
198 perf_counter_task_tick(struct task_struct
*task
, int cpu
) { }
199 static inline void perf_counter_init_task(struct task_struct
*task
) { }
200 static inline void perf_counter_notify(struct pt_regs
*regs
) { }
201 static inline void perf_counter_print_debug(void) { }
202 static inline void hw_perf_restore_ctrl(u64 ctrl
) { }
203 static inline u64
hw_perf_disable_all(void) { return 0; }
206 #endif /* _LINUX_PERF_COUNTER_H */