tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
platform/chrome: Add pstore platform_device
Add the ramoops pstore device so that we get logs of panics across reboots.
Signed-off-by: Olof Johansson <olof@lixom.net>
+116
+14
drivers/platform/chrome/Kconfig
+14
drivers/platform/chrome/Kconfig
···
25
25
If you have a supported Chromebook, choose Y or M here.
26
26
The module will be called chromeos_laptop.
27
27
28
+
config CHROMEOS_PSTORE
29
+
tristate "Chrome OS pstore support"
30
+
---help---
31
+
This module instantiates the persistent storage on x86 ChromeOS
32
+
devices. It can be used to store away console logs and crash
33
+
information across reboots.
34
+
35
+
The range of memory used is 0xf00000-0x1000000, traditionally
36
+
the memory used to back VGA controller memory.
37
+
38
+
If you have a supported Chromebook, choose Y or M here.
39
+
The module will be called chromeos_pstore.
40
+
41
+
28
42
endif # CHROMEOS_PLATFORMS
+1
drivers/platform/chrome/Makefile
+1
drivers/platform/chrome/Makefile
+101
drivers/platform/chrome/chromeos_pstore.c
+101
drivers/platform/chrome/chromeos_pstore.c
···
1
+
/*
2
+
* chromeos_pstore.c - Driver to instantiate Chromebook ramoops device
3
+
*
4
+
* Copyright (C) 2013 Google, Inc.
5
+
*
6
+
* This program is free software; you can redistribute it and/or modify
7
+
* it under the terms of the GNU General Public License as published by
8
+
* the Free Software Foundation, version 2 of the License.
9
+
*/
10
+
11
+
#include <linux/dmi.h>
12
+
#include <linux/module.h>
13
+
#include <linux/platform_device.h>
14
+
#include <linux/pstore_ram.h>
15
+
16
+
static struct dmi_system_id chromeos_pstore_dmi_table[] __initdata = {
17
+
{
18
+
/*
19
+
* Today all Chromebooks/boxes ship with GOOGLE as vendor and
20
+
* coreboot as bios vendor. No other systems with this
21
+
* combination are known to date.
22
+
*/
23
+
.matches = {
24
+
DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
25
+
DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
26
+
},
27
+
},
28
+
{
29
+
/*
30
+
* The first Samsung Chromebox and Chromebook Series 5 550 use
31
+
* coreboot but with Samsung as the system vendor.
32
+
*/
33
+
.matches = {
34
+
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
35
+
DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
36
+
},
37
+
},
38
+
{
39
+
/* x86-alex, the first Samsung Chromebook. */
40
+
.matches = {
41
+
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
42
+
DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
43
+
},
44
+
},
45
+
{
46
+
/* x86-mario, the Cr-48 pilot device from Google. */
47
+
.matches = {
48
+
DMI_MATCH(DMI_SYS_VENDOR, "IEC"),
49
+
DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
50
+
},
51
+
},
52
+
{
53
+
/* x86-zgb, the first Acer Chromebook. */
54
+
.matches = {
55
+
DMI_MATCH(DMI_SYS_VENDOR, "ACER"),
56
+
DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
57
+
},
58
+
},
59
+
{ }
60
+
};
61
+
MODULE_DEVICE_TABLE(dmi, chromeos_pstore_dmi_table);
62
+
63
+
/*
64
+
* On x86 chromebooks/boxes, the firmware will keep the legacy VGA memory
65
+
* range untouched across reboots, so we use that to store our pstore
66
+
* contents for panic logs, etc.
67
+
*/
68
+
static struct ramoops_platform_data chromeos_ramoops_data = {
69
+
.mem_size = 0x100000,
70
+
.mem_address = 0xf00000,
71
+
.record_size = 0x20000,
72
+
.console_size = 0x20000,
73
+
.ftrace_size = 0x20000,
74
+
.dump_oops = 1,
75
+
};
76
+
77
+
static struct platform_device chromeos_ramoops = {
78
+
.name = "ramoops",
79
+
.dev = {
80
+
.platform_data = &chromeos_ramoops_data,
81
+
},
82
+
};
83
+
84
+
static int __init chromeos_pstore_init(void)
85
+
{
86
+
if (dmi_check_system(chromeos_pstore_dmi_table))
87
+
return platform_device_register(&chromeos_ramoops);
88
+
89
+
return -ENODEV;
90
+
}
91
+
92
+
static void __exit chromeos_pstore_exit(void)
93
+
{
94
+
platform_device_unregister(&chromeos_ramoops);
95
+
}
96
+
97
+
module_init(chromeos_pstore_init);
98
+
module_exit(chromeos_pstore_exit);
99
+
100
+
MODULE_DESCRIPTION("Chrome OS pstore module");
101
+
MODULE_LICENSE("GPL");