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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_SIMPLE_RING_BUFFER_H
#define _LINUX_SIMPLE_RING_BUFFER_H
#include <linux/list.h>
#include <linux/ring_buffer.h>
#include <linux/ring_buffer_types.h>
#include <linux/types.h>
/*
* Ideally those struct would stay private but the caller needs to know
* the allocation size for simple_ring_buffer_init().
*/
struct simple_buffer_page {
struct list_head link;
struct buffer_data_page *page;
u64 entries;
u32 write;
u32 id;
};
struct simple_rb_per_cpu {
struct simple_buffer_page *tail_page;
struct simple_buffer_page *reader_page;
struct simple_buffer_page *head_page;
struct simple_buffer_page *bpages;
struct trace_buffer_meta *meta;
u32 nr_pages;
#define SIMPLE_RB_UNAVAILABLE 0
#define SIMPLE_RB_READY 1
#define SIMPLE_RB_WRITING 2
u32 status;
u64 last_overrun;
u64 write_stamp;
struct simple_rb_cbs *cbs;
};
int simple_ring_buffer_init(struct simple_rb_per_cpu *cpu_buffer, struct simple_buffer_page *bpages,
const struct ring_buffer_desc *desc);
void simple_ring_buffer_unload(struct simple_rb_per_cpu *cpu_buffer);
void *simple_ring_buffer_reserve(struct simple_rb_per_cpu *cpu_buffer, unsigned long length,
u64 timestamp);
void simple_ring_buffer_commit(struct simple_rb_per_cpu *cpu_buffer);
int simple_ring_buffer_enable_tracing(struct simple_rb_per_cpu *cpu_buffer, bool enable);
int simple_ring_buffer_reset(struct simple_rb_per_cpu *cpu_buffer);
int simple_ring_buffer_swap_reader_page(struct simple_rb_per_cpu *cpu_buffer);
int simple_ring_buffer_init_mm(struct simple_rb_per_cpu *cpu_buffer,
struct simple_buffer_page *bpages,
const struct ring_buffer_desc *desc,
void *(*load_page)(unsigned long va),
void (*unload_page)(void *va));
void simple_ring_buffer_unload_mm(struct simple_rb_per_cpu *cpu_buffer,
void (*unload_page)(void *));
#endif
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