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tracing: Add init callback to trace remotes

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Add a .init call back so the trace remote callers can add entries to the
tracefs directory.

Link: https://patch.msgid.link/20260309162516.2623589-9-vdonnefort@google.com
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Vincent Donnefort
2026-03-09 16:24:54 +00:00
committed by Steven Rostedt (Google)
parent 330b0cceb3
commit bf2ba0f8ca
2 changed files with 10 additions and 1 deletions
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4
include/linux/trace_remote.h
View File

@@ -3,10 +3,13 @@
#ifndef _LINUX_TRACE_REMOTE_H
#define _LINUX_TRACE_REMOTE_H
#include <linux/dcache.h>
#include <linux/ring_buffer.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())
@@ -22,6 +25,7 @@
* new reader-page from the @cpu ring-buffer.
*/
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);

7
kernel/trace/trace_remote.c
View File

@@ -863,6 +863,7 @@ static int trace_remote_init_tracefs(const char *name, struct trace_remote *remo
int trace_remote_register(const char *name, struct trace_remote_callbacks *cbs, void *priv)
{
struct trace_remote *remote;
int ret;
remote = kzalloc_obj(*remote);
if (!remote)
@@ -880,7 +881,11 @@ int trace_remote_register(const char *name, struct trace_remote_callbacks *cbs,
return -ENOMEM;
}
return 0;
ret = cbs->init ? cbs->init(remote->dentry, priv) : 0;
if (ret)
pr_err("Init failed for trace remote '%s' (%d)\n", name, ret);
return ret;
}
EXPORT_SYMBOL_GPL(trace_remote_register);