blob: a9605f90c5347096db2f30b524d11c17fe90bfdc (
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
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Pvpanic Device Support
*
* Copyright (C) 2013 Fujitsu.
* Copyright (C) 2018 ZTE.
* Copyright (C) 2021 Oracle.
*/
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/kexec.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <uapi/misc/pvpanic.h>
#include "pvpanic.h"
MODULE_AUTHOR("Mihai Carabas <mihai.carabas@oracle.com>");
MODULE_DESCRIPTION("pvpanic device driver ");
MODULE_LICENSE("GPL");
static void __iomem *base;
static unsigned int capability;
static unsigned int events;
static void
pvpanic_send_event(unsigned int event)
{
if (event & capability & events)
iowrite8(event, base);
}
static int
pvpanic_panic_notify(struct notifier_block *nb, unsigned long code,
void *unused)
{
unsigned int event = PVPANIC_PANICKED;
if (kexec_crash_loaded())
event = PVPANIC_CRASH_LOADED;
pvpanic_send_event(event);
return NOTIFY_DONE;
}
static struct notifier_block pvpanic_panic_nb = {
.notifier_call = pvpanic_panic_notify,
.priority = 1, /* let this called before broken drm_fb_helper */
};
void pvpanic_probe(void __iomem *pbase, unsigned int dev_cap)
{
base = pbase;
capability = dev_cap;
events = capability;
if (capability)
atomic_notifier_chain_register(&panic_notifier_list,
&pvpanic_panic_nb);
}
EXPORT_SYMBOL_GPL(pvpanic_probe);
void pvpanic_remove(void)
{
if (capability)
atomic_notifier_chain_unregister(&panic_notifier_list,
&pvpanic_panic_nb);
base = NULL;
}
EXPORT_SYMBOL_GPL(pvpanic_remove);
void pvpanic_set_events(unsigned int dev_events)
{
events = dev_events;
}
EXPORT_SYMBOL_GPL(pvpanic_set_events);
|
