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-rw-r--r--include/linux/ring_buffer.h38
1 files changed, 21 insertions, 17 deletions
diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h
index b3b359660082..e1b7b2173885 100644
--- a/include/linux/ring_buffer.h
+++ b/include/linux/ring_buffer.h
@@ -8,7 +8,7 @@ struct ring_buffer;
8struct ring_buffer_iter; 8struct ring_buffer_iter;
9 9
10/* 10/*
11 * Don't reference this struct directly, use functions below. 11 * Don't refer to this struct directly, use functions below.
12 */ 12 */
13struct ring_buffer_event { 13struct ring_buffer_event {
14 u32 type:2, len:3, time_delta:27; 14 u32 type:2, len:3, time_delta:27;
@@ -18,10 +18,13 @@ struct ring_buffer_event {
18/** 18/**
19 * enum ring_buffer_type - internal ring buffer types 19 * enum ring_buffer_type - internal ring buffer types
20 * 20 *
21 * @RINGBUF_TYPE_PADDING: Left over page padding 21 * @RINGBUF_TYPE_PADDING: Left over page padding or discarded event
22 * array is ignored 22 * If time_delta is 0:
23 * size is variable depending on how much 23 * array is ignored
24 * size is variable depending on how much
24 * padding is needed 25 * padding is needed
26 * If time_delta is non zero:
27 * everything else same as RINGBUF_TYPE_DATA
25 * 28 *
26 * @RINGBUF_TYPE_TIME_EXTEND: Extend the time delta 29 * @RINGBUF_TYPE_TIME_EXTEND: Extend the time delta
27 * array[0] = time delta (28 .. 59) 30 * array[0] = time delta (28 .. 59)
@@ -65,6 +68,8 @@ ring_buffer_event_time_delta(struct ring_buffer_event *event)
65 return event->time_delta; 68 return event->time_delta;
66} 69}
67 70
71void ring_buffer_event_discard(struct ring_buffer_event *event);
72
68/* 73/*
69 * size is in bytes for each per CPU buffer. 74 * size is in bytes for each per CPU buffer.
70 */ 75 */
@@ -74,13 +79,10 @@ void ring_buffer_free(struct ring_buffer *buffer);
74 79
75int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size); 80int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size);
76 81
77struct ring_buffer_event * 82struct ring_buffer_event *ring_buffer_lock_reserve(struct ring_buffer *buffer,
78ring_buffer_lock_reserve(struct ring_buffer *buffer, 83 unsigned long length);
79 unsigned long length,
80 unsigned long *flags);
81int ring_buffer_unlock_commit(struct ring_buffer *buffer, 84int ring_buffer_unlock_commit(struct ring_buffer *buffer,
82 struct ring_buffer_event *event, 85 struct ring_buffer_event *event);
83 unsigned long flags);
84int ring_buffer_write(struct ring_buffer *buffer, 86int ring_buffer_write(struct ring_buffer *buffer,
85 unsigned long length, void *data); 87 unsigned long length, void *data);
86 88
@@ -121,17 +123,19 @@ unsigned long ring_buffer_overruns(struct ring_buffer *buffer);
121unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu); 123unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu);
122unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu); 124unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu);
123 125
124u64 ring_buffer_time_stamp(int cpu); 126u64 ring_buffer_time_stamp(struct ring_buffer *buffer, int cpu);
125void ring_buffer_normalize_time_stamp(int cpu, u64 *ts); 127void ring_buffer_normalize_time_stamp(struct ring_buffer *buffer,
128 int cpu, u64 *ts);
129void ring_buffer_set_clock(struct ring_buffer *buffer,
130 u64 (*clock)(void));
131
132size_t ring_buffer_page_len(void *page);
126 133
127void tracing_on(void);
128void tracing_off(void);
129void tracing_off_permanent(void);
130 134
131void *ring_buffer_alloc_read_page(struct ring_buffer *buffer); 135void *ring_buffer_alloc_read_page(struct ring_buffer *buffer);
132void ring_buffer_free_read_page(struct ring_buffer *buffer, void *data); 136void ring_buffer_free_read_page(struct ring_buffer *buffer, void *data);
133int ring_buffer_read_page(struct ring_buffer *buffer, 137int ring_buffer_read_page(struct ring_buffer *buffer, void **data_page,
134 void **data_page, int cpu, int full); 138 size_t len, int cpu, int full);
135 139
136enum ring_buffer_flags { 140enum ring_buffer_flags {
137 RB_FL_OVERWRITE = 1 << 0, 141 RB_FL_OVERWRITE = 1 << 0,