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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_TRACE_REMOTE_H
#define _LINUX_TRACE_REMOTE_H
#include <linux/dcache.h>
#include <linux/ring_buffer.h>
#include <linux/trace_remote_event.h>
/**
* struct trace_remote_callbacks - Callbacks used by Tracefs to control the remote
* @init: Called once the remote has been registered. Allows the
* caller to extend the Tracefs remote directory
* @load_trace_buffer: Called before Tracefs accesses the trace buffer for the first
* time. Must return a &trace_buffer_desc
* (most likely filled with trace_remote_alloc_buffer())
* @unload_trace_buffer:
* Called once Tracefs has no use for the trace buffer
* (most likely call trace_remote_free_buffer())
* @enable_tracing: Called on Tracefs tracing_on. It is expected from the
* remote to allow writing.
* @swap_reader_page: Called when Tracefs consumes a new page from a
* ring-buffer. It is expected from the remote to isolate a
* @reset: Called on `echo 0 > trace`. It is expected from the
* remote to reset all ring-buffer pages.
* new reader-page from the @cpu ring-buffer.
* @enable_event: Called on events/event_name/enable. It is expected from
* the remote to allow the writing event @id.
*/
struct trace_remote_callbacks {
int (*init)(struct dentry *d, void *priv);
struct trace_buffer_desc *(*load_trace_buffer)(unsigned long size, void *priv);
void (*unload_trace_buffer)(struct trace_buffer_desc *desc, void *priv);
int (*enable_tracing)(bool enable, void *priv);
int (*swap_reader_page)(unsigned int cpu, void *priv);
int (*reset)(unsigned int cpu, void *priv);
int (*enable_event)(unsigned short id, bool enable, void *priv);
};
int trace_remote_register(const char *name, struct trace_remote_callbacks *cbs, void *priv,
struct remote_event *events, size_t nr_events);
int trace_remote_alloc_buffer(struct trace_buffer_desc *desc, size_t desc_size, size_t buffer_size,
const struct cpumask *cpumask);
void trace_remote_free_buffer(struct trace_buffer_desc *desc);
#endif
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