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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849/* 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