cregit-Linux how code gets into the kernel

Release 4.14 drivers/hwtracing/stm/ftrace.c

/*
 * Simple kernel driver to link kernel Ftrace and an STM device
 * Copyright (c) 2016, Linaro Ltd.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * STM Ftrace will be registered as a trace_export.
 */

#include <linux/module.h>
#include <linux/stm.h>
#include <linux/trace.h>


#define STM_FTRACE_NR_CHANNELS 1

#define STM_FTRACE_CHAN 0

static int stm_ftrace_link(struct stm_source_data *data);
static void stm_ftrace_unlink(struct stm_source_data *data);


static struct stm_ftrace {
	
struct stm_source_data	data;
	
struct trace_export	ftrace;

} stm_ftrace = {
	.data	= {
		.name		= "ftrace",
		.nr_chans	= STM_FTRACE_NR_CHANNELS,
		.link		= stm_ftrace_link,
		.unlink		= stm_ftrace_unlink,
        },
};

/**
 * stm_ftrace_write() - write data to STM via 'stm_ftrace' source
 * @buf:        buffer containing the data packet
 * @len:        length of the data packet
 */

static void notrace stm_ftrace_write(const void *buf, unsigned int len) { stm_source_write(&stm_ftrace.data, STM_FTRACE_CHAN, buf, len); }

Contributors

PersonTokensPropCommitsCommitProp
Chunyan Zhang30100.00%1100.00%
Total30100.00%1100.00%


static int stm_ftrace_link(struct stm_source_data *data) { struct stm_ftrace *sf = container_of(data, struct stm_ftrace, data); sf->ftrace.write = stm_ftrace_write; return register_ftrace_export(&sf->ftrace); }

Contributors

PersonTokensPropCommitsCommitProp
Chunyan Zhang43100.00%1100.00%
Total43100.00%1100.00%


static void stm_ftrace_unlink(struct stm_source_data *data) { struct stm_ftrace *sf = container_of(data, struct stm_ftrace, data); unregister_ftrace_export(&sf->ftrace); }

Contributors

PersonTokensPropCommitsCommitProp
Chunyan Zhang34100.00%1100.00%
Total34100.00%1100.00%


static int __init stm_ftrace_init(void) { int ret; ret = stm_source_register_device(NULL, &stm_ftrace.data); if (ret) pr_err("Failed to register stm_source - ftrace.\n"); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Chunyan Zhang36100.00%1100.00%
Total36100.00%1100.00%


static void __exit stm_ftrace_exit(void) { stm_source_unregister_device(&stm_ftrace.data); }

Contributors

PersonTokensPropCommitsCommitProp
Chunyan Zhang17100.00%1100.00%
Total17100.00%1100.00%

module_init(stm_ftrace_init); module_exit(stm_ftrace_exit); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("stm_ftrace driver"); MODULE_AUTHOR("Chunyan Zhang <zhang.chunyan@linaro.org>");

Overall Contributors

PersonTokensPropCommitsCommitProp
Chunyan Zhang266100.00%1100.00%
Total266100.00%1100.00%
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