Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
tracing: Add init callback to trace remotes
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>
authored by
Vincent Donnefort
and committed by
Steven Rostedt (Google)
bf2ba0f8
330b0cce
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include/linux/trace_remote.h
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include/linux/trace_remote.h
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#ifndef _LINUX_TRACE_REMOTE_H
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#define _LINUX_TRACE_REMOTE_H
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#include <linux/dcache.h>
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#include <linux/ring_buffer.h>
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/**
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* struct trace_remote_callbacks - Callbacks used by Tracefs to control the remote
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* @init: Called once the remote has been registered. Allows the
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* caller to extend the Tracefs remote directory
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* @load_trace_buffer: Called before Tracefs accesses the trace buffer for the first
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* time. Must return a &trace_buffer_desc
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* (most likely filled with trace_remote_alloc_buffer())
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* new reader-page from the @cpu ring-buffer.
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*/
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struct trace_remote_callbacks {
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int (*init)(struct dentry *d, void *priv);
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struct trace_buffer_desc *(*load_trace_buffer)(unsigned long size, void *priv);
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void (*unload_trace_buffer)(struct trace_buffer_desc *desc, void *priv);
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int (*enable_tracing)(bool enable, void *priv);
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kernel/trace/trace_remote.c
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kernel/trace/trace_remote.c
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int trace_remote_register(const char *name, struct trace_remote_callbacks *cbs, void *priv)
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{
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struct trace_remote *remote;
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int ret;
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remote = kzalloc_obj(*remote);
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if (!remote)
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return -ENOMEM;
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}
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-
return 0;
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ret = cbs->init ? cbs->init(remote->dentry, priv) : 0;
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if (ret)
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pr_err("Init failed for trace remote '%s' (%d)\n", name, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(trace_remote_register);
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