perf: Remove the nmi parameter from the swevent and overflow interface
[linux-2.6.git] / kernel / events / internal.h
1 #ifndef _KERNEL_EVENTS_INTERNAL_H
2 #define _KERNEL_EVENTS_INTERNAL_H
3
4 #define RING_BUFFER_WRITABLE            0x01
5
6 struct ring_buffer {
7         atomic_t                        refcount;
8         struct rcu_head                 rcu_head;
9 #ifdef CONFIG_PERF_USE_VMALLOC
10         struct work_struct              work;
11         int                             page_order;     /* allocation order  */
12 #endif
13         int                             nr_pages;       /* nr of data pages  */
14         int                             writable;       /* are we writable   */
15
16         atomic_t                        poll;           /* POLL_ for wakeups */
17
18         local_t                         head;           /* write position    */
19         local_t                         nest;           /* nested writers    */
20         local_t                         events;         /* event limit       */
21         local_t                         wakeup;         /* wakeup stamp      */
22         local_t                         lost;           /* nr records lost   */
23
24         long                            watermark;      /* wakeup watermark  */
25
26         struct perf_event_mmap_page     *user_page;
27         void                            *data_pages[0];
28 };
29
30 extern void rb_free(struct ring_buffer *rb);
31 extern struct ring_buffer *
32 rb_alloc(int nr_pages, long watermark, int cpu, int flags);
33 extern void perf_event_wakeup(struct perf_event *event);
34
35 extern void
36 perf_event_header__init_id(struct perf_event_header *header,
37                            struct perf_sample_data *data,
38                            struct perf_event *event);
39 extern void
40 perf_event__output_id_sample(struct perf_event *event,
41                              struct perf_output_handle *handle,
42                              struct perf_sample_data *sample);
43
44 extern struct page *
45 perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff);
46
47 #ifdef CONFIG_PERF_USE_VMALLOC
48 /*
49  * Back perf_mmap() with vmalloc memory.
50  *
51  * Required for architectures that have d-cache aliasing issues.
52  */
53
54 static inline int page_order(struct ring_buffer *rb)
55 {
56         return rb->page_order;
57 }
58
59 #else
60
61 static inline int page_order(struct ring_buffer *rb)
62 {
63         return 0;
64 }
65 #endif
66
67 static unsigned long perf_data_size(struct ring_buffer *rb)
68 {
69         return rb->nr_pages << (PAGE_SHIFT + page_order(rb));
70 }
71
72 static inline void
73 __output_copy(struct perf_output_handle *handle,
74                    const void *buf, unsigned int len)
75 {
76         do {
77                 unsigned long size = min_t(unsigned long, handle->size, len);
78
79                 memcpy(handle->addr, buf, size);
80
81                 len -= size;
82                 handle->addr += size;
83                 buf += size;
84                 handle->size -= size;
85                 if (!handle->size) {
86                         struct ring_buffer *rb = handle->rb;
87
88                         handle->page++;
89                         handle->page &= rb->nr_pages - 1;
90                         handle->addr = rb->data_pages[handle->page];
91                         handle->size = PAGE_SIZE << page_order(rb);
92                 }
93         } while (len);
94 }
95
96 #endif /* _KERNEL_EVENTS_INTERNAL_H */