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
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/*
* Copyright 2014 Red Hat Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: Ben Skeggs <bskeggs@redhat.com>
*/
#include <core/notify.h>
#include <core/event.h>
static inline void
nvkm_notify_put_locked(struct nvkm_notify *notify)
{
if (notify->block++ == 0)
nvkm_event_put(notify->event, notify->types, notify->index);
}
void
nvkm_notify_put(struct nvkm_notify *notify)
{
struct nvkm_event *event = notify->event;
unsigned long flags;
if (likely(event) &&
test_and_clear_bit(NVKM_NOTIFY_USER, ¬ify->flags)) {
spin_lock_irqsave(&event->refs_lock, flags);
nvkm_notify_put_locked(notify);
spin_unlock_irqrestore(&event->refs_lock, flags);
if (test_bit(NVKM_NOTIFY_WORK, ¬ify->flags))
flush_work(¬ify->work);
}
}
static inline void
nvkm_notify_get_locked(struct nvkm_notify *notify)
{
if (--notify->block == 0)
nvkm_event_get(notify->event, notify->types, notify->index);
}
void
nvkm_notify_get(struct nvkm_notify *notify)
{
struct nvkm_event *event = notify->event;
unsigned long flags;
if (likely(event) &&
!test_and_set_bit(NVKM_NOTIFY_USER, ¬ify->flags)) {
spin_lock_irqsave(&event->refs_lock, flags);
nvkm_notify_get_locked(notify);
spin_unlock_irqrestore(&event->refs_lock, flags);
}
}
static inline void
nvkm_notify_func(struct nvkm_notify *notify)
{
struct nvkm_event *event = notify->event;
int ret = notify->func(notify);
unsigned long flags;
if ((ret == NVKM_NOTIFY_KEEP) ||
!test_and_clear_bit(NVKM_NOTIFY_USER, ¬ify->flags)) {
spin_lock_irqsave(&event->refs_lock, flags);
nvkm_notify_get_locked(notify);
spin_unlock_irqrestore(&event->refs_lock, flags);
}
}
static void
nvkm_notify_work(struct work_struct *work)
{
struct nvkm_notify *notify = container_of(work, typeof(*notify), work);
nvkm_notify_func(notify);
}
void
nvkm_notify_send(struct nvkm_notify *notify, void *data, u32 size)
{
struct nvkm_event *event = notify->event;
unsigned long flags;
assert_spin_locked(&event->list_lock);
BUG_ON(size != notify->size);
spin_lock_irqsave(&event->refs_lock, flags);
if (notify->block) {
spin_unlock_irqrestore(&event->refs_lock, flags);
return;
}
nvkm_notify_put_locked(notify);
spin_unlock_irqrestore(&event->refs_lock, flags);
if (test_bit(NVKM_NOTIFY_WORK, ¬ify->flags)) {
memcpy((void *)notify->data, data, size);
schedule_work(¬ify->work);
} else {
notify->data = data;
nvkm_notify_func(notify);
notify->data = NULL;
}
}
void
nvkm_notify_fini(struct nvkm_notify *notify)
{
unsigned long flags;
if (notify->event) {
nvkm_notify_put(notify);
spin_lock_irqsave(¬ify->event->list_lock, flags);
list_del(¬ify->head);
spin_unlock_irqrestore(¬ify->event->list_lock, flags);
kfree((void *)notify->data);
notify->event = NULL;
}
}
int
nvkm_notify_init(struct nvkm_object *object, struct nvkm_event *event,
int (*func)(struct nvkm_notify *), bool work,
void *data, u32 size, u32 reply,
struct nvkm_notify *notify)
{
unsigned long flags;
int ret = -ENODEV;
if ((notify->event = event), event->refs) {
ret = event->func->ctor(object, data, size, notify);
if (ret == 0 && (ret = -EINVAL, notify->size == reply)) {
notify->flags = 0;
notify->block = 1;
notify->func = func;
notify->data = NULL;
if (ret = 0, work) {
INIT_WORK(¬ify->work, nvkm_notify_work);
set_bit(NVKM_NOTIFY_WORK, ¬ify->flags);
notify->data = kmalloc(reply, GFP_KERNEL);
if (!notify->data)
ret = -ENOMEM;
}
}
if (ret == 0) {
spin_lock_irqsave(&event->list_lock, flags);
list_add_tail(¬ify->head, &event->list);
spin_unlock_irqrestore(&event->list_lock, flags);
}
}
if (ret)
notify->event = NULL;
return ret;
}
|
