Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /** |
2 | * @file cpu_buffer.h | |
3 | * | |
2cc28b9f | 4 | * @remark Copyright 2002-2009 OProfile authors |
1da177e4 LT |
5 | * @remark Read the file COPYING |
6 | * | |
7 | * @author John Levon <levon@movementarian.org> | |
2cc28b9f | 8 | * @author Robert Richter <robert.richter@amd.com> |
1da177e4 LT |
9 | */ |
10 | ||
11 | #ifndef OPROFILE_CPU_BUFFER_H | |
12 | #define OPROFILE_CPU_BUFFER_H | |
13 | ||
14 | #include <linux/types.h> | |
15 | #include <linux/spinlock.h> | |
16 | #include <linux/workqueue.h> | |
17 | #include <linux/cache.h> | |
608dfddd | 18 | #include <linux/sched.h> |
6dad828b | 19 | #include <linux/ring_buffer.h> |
6a18037d | 20 | |
1da177e4 | 21 | struct task_struct; |
6a18037d | 22 | |
1da177e4 LT |
23 | int alloc_cpu_buffers(void); |
24 | void free_cpu_buffers(void); | |
25 | ||
26 | void start_cpu_work(void); | |
27 | void end_cpu_work(void); | |
3d7851b3 | 28 | void flush_cpu_work(void); |
1da177e4 LT |
29 | |
30 | /* CPU buffer is composed of such entries (which are | |
31 | * also used for context switch notes) | |
32 | */ | |
33 | struct op_sample { | |
34 | unsigned long eip; | |
35 | unsigned long event; | |
2cc28b9f | 36 | unsigned long data[0]; |
1da177e4 | 37 | }; |
6a18037d | 38 | |
14f0ca8e | 39 | struct op_entry; |
6dad828b | 40 | |
1da177e4 | 41 | struct oprofile_cpu_buffer { |
1da177e4 | 42 | unsigned long buffer_size; |
25ad2913 | 43 | struct task_struct *last_task; |
1da177e4 LT |
44 | int last_is_kernel; |
45 | int tracing; | |
1da177e4 LT |
46 | unsigned long sample_received; |
47 | unsigned long sample_lost_overflow; | |
48 | unsigned long backtrace_aborted; | |
df9d177a | 49 | unsigned long sample_invalid_eip; |
1da177e4 | 50 | int cpu; |
c4028958 | 51 | struct delayed_work work; |
8b8b4988 | 52 | }; |
1da177e4 | 53 | |
b3e9f672 | 54 | DECLARE_PER_CPU(struct oprofile_cpu_buffer, op_cpu_buffer); |
1da177e4 | 55 | |
fbc9bf9f RR |
56 | /* |
57 | * Resets the cpu buffer to a sane state. | |
58 | * | |
59 | * reset these to invalid values; the next sample collected will | |
60 | * populate the buffer with proper values to initialize the buffer | |
61 | */ | |
6d2c53f3 | 62 | static inline void op_cpu_buffer_reset(int cpu) |
fbc9bf9f | 63 | { |
b3e9f672 | 64 | struct oprofile_cpu_buffer *cpu_buf = &per_cpu(op_cpu_buffer, cpu); |
fbc9bf9f RR |
65 | |
66 | cpu_buf->last_is_kernel = -1; | |
67 | cpu_buf->last_task = NULL; | |
68 | } | |
1da177e4 | 69 | |
fdb6a8f4 RR |
70 | /* |
71 | * op_cpu_buffer_add_data() and op_cpu_buffer_write_commit() may be | |
72 | * called only if op_cpu_buffer_write_reserve() did not return NULL or | |
73 | * entry->event != NULL, otherwise entry->size or entry->event will be | |
74 | * used uninitialized. | |
75 | */ | |
76 | ||
2cc28b9f RR |
77 | struct op_sample |
78 | *op_cpu_buffer_write_reserve(struct op_entry *entry, unsigned long size); | |
9966718d | 79 | int op_cpu_buffer_write_commit(struct op_entry *entry); |
2d87b14c | 80 | struct op_sample *op_cpu_buffer_read_entry(struct op_entry *entry, int cpu); |
9966718d | 81 | unsigned long op_cpu_buffer_entries(int cpu); |
bf589e32 | 82 | |
d9928c25 RR |
83 | /* returns the remaining free size of data in the entry */ |
84 | static inline | |
85 | int op_cpu_buffer_add_data(struct op_entry *entry, unsigned long val) | |
86 | { | |
87 | if (!entry->size) | |
88 | return 0; | |
89 | *entry->data = val; | |
90 | entry->size--; | |
91 | entry->data++; | |
92 | return entry->size; | |
93 | } | |
94 | ||
bd7dc46f RR |
95 | /* returns the size of data in the entry */ |
96 | static inline | |
97 | int op_cpu_buffer_get_size(struct op_entry *entry) | |
98 | { | |
99 | return entry->size; | |
100 | } | |
101 | ||
102 | /* returns 0 if empty or the size of data including the current value */ | |
103 | static inline | |
104 | int op_cpu_buffer_get_data(struct op_entry *entry, unsigned long *val) | |
105 | { | |
106 | int size = entry->size; | |
107 | if (!size) | |
108 | return 0; | |
109 | *val = *entry->data; | |
110 | entry->size--; | |
111 | entry->data++; | |
112 | return size; | |
113 | } | |
114 | ||
ae735e99 RR |
115 | /* extra data flags */ |
116 | #define KERNEL_CTX_SWITCH (1UL << 0) | |
117 | #define IS_KERNEL (1UL << 1) | |
118 | #define TRACE_BEGIN (1UL << 2) | |
119 | #define USER_CTX_SWITCH (1UL << 3) | |
1da177e4 LT |
120 | |
121 | #endif /* OPROFILE_CPU_BUFFER_H */ |