| 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
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| 2 | #ifndef _TRACE_MMAP_H_ |
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| 3 | #define _TRACE_MMAP_H_ |
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| 4 | |
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| 5 | #include <linux/types.h> |
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| 6 | |
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| 7 | /** |
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| 8 | * struct trace_buffer_meta - Ring-buffer Meta-page description |
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| 9 | * @meta_page_size: Size of this meta-page. |
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| 10 | * @meta_struct_len: Size of this structure. |
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| 11 | * @subbuf_size: Size of each sub-buffer. |
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| 12 | * @nr_subbufs: Number of subbfs in the ring-buffer, including the reader. |
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| 13 | * @reader.lost_events: Number of events lost at the time of the reader swap. |
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| 14 | * @reader.id: subbuf ID of the current reader. ID range [0 : @nr_subbufs - 1] |
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| 15 | * @reader.read: Number of bytes read on the reader subbuf. |
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| 16 | * @flags: Placeholder for now, 0 until new features are supported. |
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| 17 | * @entries: Number of entries in the ring-buffer. |
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| 18 | * @overrun: Number of entries lost in the ring-buffer. |
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| 19 | * @read: Number of entries that have been read. |
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| 20 | * @Reserved1: Internal use only. |
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| 21 | * @Reserved2: Internal use only. |
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| 22 | */ |
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| 23 | struct trace_buffer_meta { |
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| 24 | __u32 meta_page_size; |
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| 25 | __u32 meta_struct_len; |
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| 26 | |
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| 27 | __u32 subbuf_size; |
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| 28 | __u32 nr_subbufs; |
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| 29 | |
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| 30 | struct { |
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| 31 | __u64 lost_events; |
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| 32 | __u32 id; |
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| 33 | __u32 read; |
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| 34 | } reader; |
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| 35 | |
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| 36 | __u64 flags; |
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| 37 | |
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| 38 | __u64 entries; |
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| 39 | __u64 overrun; |
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| 40 | __u64 read; |
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| 41 | |
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| 42 | __u64 Reserved1; |
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| 43 | __u64 Reserved2; |
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| 44 | }; |
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| 45 | |
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| 46 | #define TRACE_MMAP_IOCTL_GET_READER _IO('R', 0x20) |
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| 47 | |
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| 48 | #endif /* _TRACE_MMAP_H_ */ |
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| 49 | |
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