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Commit e3e5a3d3 authored by Alexander Shishkin's avatar Alexander Shishkin Committed by Greg Kroah-Hartman
Browse files

stm class: stm_console: Add kernel-console-over-stm driver 



This is a simple stm_source class device driver (kernelspace stm trace
source) that registers a console and sends kernel messages over STM
devices.

Reviewed-by: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: default avatarAlexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2c415381

drivers/hwtracing/stm/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -14,3 +14,12 @@ config STM_DUMMY 
	  and discards your data. Use for stm class testing.



	  If you don't know what this is, say N.



config STM_SOURCE_CONSOLE

	tristate "Kernel console over STM devices"

	help

	  This is a kernel space trace source that sends kernel log

	  messages to trace hosts over STM devices.



	  If you want to send kernel console messages over STM devices,

	  say Y.

drivers/hwtracing/stm/Makefile

+4 −0
Original line number Diff line number Diff line
@@ -3,3 +3,7 @@ obj-$(CONFIG_STM) += stm_core.o 
stm_core-y		:= core.o policy.o



obj-$(CONFIG_STM_DUMMY)	+= dummy_stm.o



obj-$(CONFIG_STM_SOURCE_CONSOLE)	+= stm_console.o



stm_console-y		:= console.o

drivers/hwtracing/stm/console.c

0 → 100644
+80 −0
Original line number Diff line number Diff line 
/*

 * Simple kernel console driver for STM devices

 * Copyright (c) 2014, Intel Corporation.

 *

 * 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 console will send kernel messages over STM devices to a trace host.

 */



#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/console.h>

#include <linux/slab.h>

#include <linux/stm.h>



static int stm_console_link(struct stm_source_data *data);

static void stm_console_unlink(struct stm_source_data *data);



static struct stm_console {

	struct stm_source_data	data;

	struct console		console;

} stm_console = {

	.data	= {

		.name		= "console",

		.nr_chans	= 1,

		.link		= stm_console_link,

		.unlink		= stm_console_unlink,

	},

};



static void

stm_console_write(struct console *con, const char *buf, unsigned len)

{

	struct stm_console *sc = container_of(con, struct stm_console, console);



	stm_source_write(&sc->data, 0, buf, len);

}



static int stm_console_link(struct stm_source_data *data)

{

	struct stm_console *sc = container_of(data, struct stm_console, data);



	strcpy(sc->console.name, "stm_console");

	sc->console.write = stm_console_write;

	sc->console.flags = CON_ENABLED | CON_PRINTBUFFER;

	register_console(&sc->console);



	return 0;

}



static void stm_console_unlink(struct stm_source_data *data)

{

	struct stm_console *sc = container_of(data, struct stm_console, data);



	unregister_console(&sc->console);

}



static int stm_console_init(void)

{

	return stm_source_register_device(NULL, &stm_console.data);

}



static void stm_console_exit(void)

{

	stm_source_unregister_device(&stm_console.data);

}



module_init(stm_console_init);

module_exit(stm_console_exit);



MODULE_LICENSE("GPL v2");

MODULE_DESCRIPTION("stm_console driver");

MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");