tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
authored by
Alexander Shishkin
and committed by
Greg Kroah-Hartman
e3e5a3d3
2c415381
+93
+9
drivers/hwtracing/stm/Kconfig
+9
drivers/hwtracing/stm/Kconfig
···
14
14
and discards your data. Use for stm class testing.
15
15
16
16
If you don't know what this is, say N.
17
+
18
+
config STM_SOURCE_CONSOLE
19
+
tristate "Kernel console over STM devices"
20
+
help
21
+
This is a kernel space trace source that sends kernel log
22
+
messages to trace hosts over STM devices.
23
+
24
+
If you want to send kernel console messages over STM devices,
25
+
say Y.
+4
drivers/hwtracing/stm/Makefile
+4
drivers/hwtracing/stm/Makefile
+80
drivers/hwtracing/stm/console.c
+80
drivers/hwtracing/stm/console.c
···
1
+
/*
2
+
* Simple kernel console driver for STM devices
3
+
* Copyright (c) 2014, Intel Corporation.
4
+
*
5
+
* This program is free software; you can redistribute it and/or modify it
6
+
* under the terms and conditions of the GNU General Public License,
7
+
* version 2, as published by the Free Software Foundation.
8
+
*
9
+
* This program is distributed in the hope it will be useful, but WITHOUT
10
+
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11
+
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12
+
* more details.
13
+
*
14
+
* STM console will send kernel messages over STM devices to a trace host.
15
+
*/
16
+
17
+
#include <linux/kernel.h>
18
+
#include <linux/module.h>
19
+
#include <linux/console.h>
20
+
#include <linux/slab.h>
21
+
#include <linux/stm.h>
22
+
23
+
static int stm_console_link(struct stm_source_data *data);
24
+
static void stm_console_unlink(struct stm_source_data *data);
25
+
26
+
static struct stm_console {
27
+
struct stm_source_data data;
28
+
struct console console;
29
+
} stm_console = {
30
+
.data = {
31
+
.name = "console",
32
+
.nr_chans = 1,
33
+
.link = stm_console_link,
34
+
.unlink = stm_console_unlink,
35
+
},
36
+
};
37
+
38
+
static void
39
+
stm_console_write(struct console *con, const char *buf, unsigned len)
40
+
{
41
+
struct stm_console *sc = container_of(con, struct stm_console, console);
42
+
43
+
stm_source_write(&sc->data, 0, buf, len);
44
+
}
45
+
46
+
static int stm_console_link(struct stm_source_data *data)
47
+
{
48
+
struct stm_console *sc = container_of(data, struct stm_console, data);
49
+
50
+
strcpy(sc->console.name, "stm_console");
51
+
sc->console.write = stm_console_write;
52
+
sc->console.flags = CON_ENABLED | CON_PRINTBUFFER;
53
+
register_console(&sc->console);
54
+
55
+
return 0;
56
+
}
57
+
58
+
static void stm_console_unlink(struct stm_source_data *data)
59
+
{
60
+
struct stm_console *sc = container_of(data, struct stm_console, data);
61
+
62
+
unregister_console(&sc->console);
63
+
}
64
+
65
+
static int stm_console_init(void)
66
+
{
67
+
return stm_source_register_device(NULL, &stm_console.data);
68
+
}
69
+
70
+
static void stm_console_exit(void)
71
+
{
72
+
stm_source_unregister_device(&stm_console.data);
73
+
}
74
+
75
+
module_init(stm_console_init);
76
+
module_exit(stm_console_exit);
77
+
78
+
MODULE_LICENSE("GPL v2");
79
+
MODULE_DESCRIPTION("stm_console driver");
80
+
MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");