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1 | /** |
2 | * @file cpu_buffer.h |
3 | * |
4 | * @remark Copyright 2002-2009 OProfile authors |
5 | * @remark Read the file COPYING |
6 | * |
7 | * @author John Levon <levon@movementarian.org> |
8 | * @author Robert Richter <robert.richter@amd.com> |
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> |
18 | #include <linux/sched.h> |
19 | #include <linux/ring_buffer.h> |
20 | |
21 | struct task_struct; |
22 | |
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); |
28 | void flush_cpu_work(void); |
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; |
36 | unsigned long data[0]; |
37 | }; |
38 | |
39 | struct op_entry; |
40 | |
41 | struct oprofile_cpu_buffer { |
42 | unsigned long buffer_size; |
43 | struct task_struct *last_task; |
44 | int last_is_kernel; |
45 | int tracing; |
46 | unsigned long sample_received; |
47 | unsigned long sample_lost_overflow; |
48 | unsigned long backtrace_aborted; |
49 | unsigned long sample_invalid_eip; |
50 | int cpu; |
51 | struct delayed_work work; |
52 | }; |
53 | |
54 | DECLARE_PER_CPU(struct oprofile_cpu_buffer, op_cpu_buffer); |
55 | |
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 | */ |
62 | static inline void op_cpu_buffer_reset(int cpu) |
63 | { |
64 | struct oprofile_cpu_buffer *cpu_buf = &per_cpu(op_cpu_buffer, cpu); |
65 | |
66 | cpu_buf->last_is_kernel = -1; |
67 | cpu_buf->last_task = NULL; |
68 | } |
69 | |
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 | |
77 | struct op_sample |
78 | *op_cpu_buffer_write_reserve(struct op_entry *entry, unsigned long size); |
79 | int op_cpu_buffer_write_commit(struct op_entry *entry); |
80 | struct op_sample *op_cpu_buffer_read_entry(struct op_entry *entry, int cpu); |
81 | unsigned long op_cpu_buffer_entries(int cpu); |
82 | |
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 | |
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 | |
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) |
120 | |
121 | #endif /* OPROFILE_CPU_BUFFER_H */ |
122 |
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