| /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ | |
| #ifndef _TRACE_MMAP_H_ | |
| #define _TRACE_MMAP_H_ | |
| #include <linux/types.h> | |
| /** | |
| * struct trace_buffer_meta - Ring-buffer Meta-page description | |
| * @meta_page_size: Size of this meta-page. | |
| * @meta_struct_len: Size of this structure. | |
| * @subbuf_size: Size of each sub-buffer. | |
| * @nr_subbufs: Number of subbfs in the ring-buffer, including the reader. | |
| * @reader.lost_events: Number of events lost at the time of the reader swap. | |
| * @reader.id: subbuf ID of the current reader. ID range [0 : @nr_subbufs - 1] | |
| * @reader.read: Number of bytes read on the reader subbuf. | |
| * @flags: Placeholder for now, 0 until new features are supported. | |
| * @entries: Number of entries in the ring-buffer. | |
| * @overrun: Number of entries lost in the ring-buffer. | |
| * @read: Number of entries that have been read. | |
| * @Reserved1: Internal use only. | |
| * @Reserved2: Internal use only. | |
| */ | |
| struct trace_buffer_meta { | |
| __u32 meta_page_size; | |
| __u32 meta_struct_len; | |
| __u32 subbuf_size; | |
| __u32 nr_subbufs; | |
| struct { | |
| __u64 lost_events; | |
| __u32 id; | |
| __u32 read; | |
| } reader; | |
| __u64 flags; | |
| __u64 entries; | |
| __u64 overrun; | |
| __u64 read; | |
| __u64 Reserved1; | |
| __u64 Reserved2; | |
| }; | |
| #define TRACE_MMAP_IOCTL_GET_READER _IO('R', 0x20) | |
| #endif /* _TRACE_MMAP_H_ */ |