blob: eea660096f1bd39d604b2145fc5633d4cc03ee13 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
// SPDX-License-Identifier: GPL-2.0 or MIT
#include <linux/sysrq.h>
#include <drm/drm_client_event.h>
#include <drm/drm_device.h>
#include <drm/drm_print.h>
#include "drm_internal.h"
#ifdef CONFIG_MAGIC_SYSRQ
static LIST_HEAD(drm_client_sysrq_dev_list);
static DEFINE_MUTEX(drm_client_sysrq_dev_lock);
/* emergency restore, don't bother with error reporting */
static void drm_client_sysrq_restore_work_fn(struct work_struct *ignored)
{
struct drm_device *dev;
guard(mutex)(&drm_client_sysrq_dev_lock);
list_for_each_entry(dev, &drm_client_sysrq_dev_list, client_sysrq_list) {
if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
continue;
drm_client_dev_restore(dev, true);
}
}
static DECLARE_WORK(drm_client_sysrq_restore_work, drm_client_sysrq_restore_work_fn);
static void drm_client_sysrq_restore_handler(u8 ignored)
{
schedule_work(&drm_client_sysrq_restore_work);
}
static const struct sysrq_key_op drm_client_sysrq_restore_op = {
.handler = drm_client_sysrq_restore_handler,
.help_msg = "force-fb(v)",
.action_msg = "Restore framebuffer console",
};
void drm_client_sysrq_register(struct drm_device *dev)
{
guard(mutex)(&drm_client_sysrq_dev_lock);
if (list_empty(&drm_client_sysrq_dev_list))
register_sysrq_key('v', &drm_client_sysrq_restore_op);
list_add(&dev->client_sysrq_list, &drm_client_sysrq_dev_list);
}
void drm_client_sysrq_unregister(struct drm_device *dev)
{
guard(mutex)(&drm_client_sysrq_dev_lock);
/* remove device from global restore list */
if (!drm_WARN_ON(dev, list_empty(&dev->client_sysrq_list)))
list_del(&dev->client_sysrq_list);
/* no devices left; unregister key */
if (list_empty(&drm_client_sysrq_dev_list))
unregister_sysrq_key('v', &drm_client_sysrq_restore_op);
}
#endif
|
