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
164
165
166
167
168
169
170
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Syncpoint dma_fence implementation
*
* Copyright (c) 2020, NVIDIA Corporation.
*/
#include <linux/dma-fence.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/sync_file.h>
#include "fence.h"
#include "intr.h"
#include "syncpt.h"
static DEFINE_SPINLOCK(lock);
struct host1x_syncpt_fence {
struct dma_fence base;
atomic_t signaling;
struct host1x_syncpt *sp;
u32 threshold;
struct host1x_waitlist *waiter;
void *waiter_ref;
struct delayed_work timeout_work;
};
static const char *host1x_syncpt_fence_get_driver_name(struct dma_fence *f)
{
return "host1x";
}
static const char *host1x_syncpt_fence_get_timeline_name(struct dma_fence *f)
{
return "syncpoint";
}
static struct host1x_syncpt_fence *to_host1x_fence(struct dma_fence *f)
{
return container_of(f, struct host1x_syncpt_fence, base);
}
static bool host1x_syncpt_fence_enable_signaling(struct dma_fence *f)
{
struct host1x_syncpt_fence *sf = to_host1x_fence(f);
int err;
if (host1x_syncpt_is_expired(sf->sp, sf->threshold))
return false;
dma_fence_get(f);
/*
* The dma_fence framework requires the fence driver to keep a
* reference to any fences for which 'enable_signaling' has been
* called (and that have not been signalled).
*
* We provide a userspace API to create arbitrary syncpoint fences,
* so we cannot normally guarantee that all fences get signalled.
* As such, setup a timeout, so that long-lasting fences will get
* reaped eventually.
*/
schedule_delayed_work(&sf->timeout_work, msecs_to_jiffies(30000));
err = host1x_intr_add_action(sf->sp->host, sf->sp, sf->threshold,
HOST1X_INTR_ACTION_SIGNAL_FENCE, f,
sf->waiter, &sf->waiter_ref);
if (err) {
cancel_delayed_work_sync(&sf->timeout_work);
dma_fence_put(f);
return false;
}
/* intr framework takes ownership of waiter */
sf->waiter = NULL;
/*
* The fence may get signalled at any time after the above call,
* so we need to initialize all state used by signalling
* before it.
*/
return true;
}
static void host1x_syncpt_fence_release(struct dma_fence *f)
{
struct host1x_syncpt_fence *sf = to_host1x_fence(f);
if (sf->waiter)
kfree(sf->waiter);
dma_fence_free(f);
}
static const struct dma_fence_ops host1x_syncpt_fence_ops = {
.get_driver_name = host1x_syncpt_fence_get_driver_name,
.get_timeline_name = host1x_syncpt_fence_get_timeline_name,
.enable_signaling = host1x_syncpt_fence_enable_signaling,
.release = host1x_syncpt_fence_release,
};
void host1x_fence_signal(struct host1x_syncpt_fence *f)
{
if (atomic_xchg(&f->signaling, 1))
return;
/*
* Cancel pending timeout work - if it races, it will
* not get 'f->signaling' and return.
*/
cancel_delayed_work_sync(&f->timeout_work);
host1x_intr_put_ref(f->sp->host, f->sp->id, f->waiter_ref, false);
dma_fence_signal(&f->base);
dma_fence_put(&f->base);
}
static void do_fence_timeout(struct work_struct *work)
{
struct delayed_work *dwork = (struct delayed_work *)work;
struct host1x_syncpt_fence *f =
container_of(dwork, struct host1x_syncpt_fence, timeout_work);
if (atomic_xchg(&f->signaling, 1))
return;
/*
* Cancel pending timeout work - if it races, it will
* not get 'f->signaling' and return.
*/
host1x_intr_put_ref(f->sp->host, f->sp->id, f->waiter_ref, true);
dma_fence_set_error(&f->base, -ETIMEDOUT);
dma_fence_signal(&f->base);
dma_fence_put(&f->base);
}
struct dma_fence *host1x_fence_create(struct host1x_syncpt *sp, u32 threshold)
{
struct host1x_syncpt_fence *fence;
fence = kzalloc(sizeof(*fence), GFP_KERNEL);
if (!fence)
return ERR_PTR(-ENOMEM);
fence->waiter = kzalloc(sizeof(*fence->waiter), GFP_KERNEL);
if (!fence->waiter) {
kfree(fence);
return ERR_PTR(-ENOMEM);
}
fence->sp = sp;
fence->threshold = threshold;
dma_fence_init(&fence->base, &host1x_syncpt_fence_ops, &lock,
dma_fence_context_alloc(1), 0);
INIT_DELAYED_WORK(&fence->timeout_work, do_fence_timeout);
return &fence->base;
}
EXPORT_SYMBOL(host1x_fence_create);
|
