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
|
// SPDX-License-Identifier: MIT
/* Copyright © 2025 Intel Corporation */
#include "i915_drv.h"
#include "i915_gem_object_frontbuffer.h"
static int frontbuffer_active(struct i915_active *ref)
{
struct i915_frontbuffer *front =
container_of(ref, typeof(*front), write);
kref_get(&front->ref);
return 0;
}
static void frontbuffer_retire(struct i915_active *ref)
{
struct i915_frontbuffer *front =
container_of(ref, typeof(*front), write);
intel_frontbuffer_flush(&front->base, ORIGIN_CS);
i915_gem_object_frontbuffer_put(front);
}
struct i915_frontbuffer *
i915_gem_object_frontbuffer_get(struct drm_i915_gem_object *obj)
{
struct drm_i915_private *i915 = to_i915(obj->base.dev);
struct i915_frontbuffer *front, *cur;
front = i915_gem_object_frontbuffer_lookup(obj);
if (front)
return front;
front = kmalloc(sizeof(*front), GFP_KERNEL);
if (!front)
return NULL;
intel_frontbuffer_init(&front->base, &i915->drm);
kref_init(&front->ref);
i915_gem_object_get(obj);
front->obj = obj;
i915_active_init(&front->write,
frontbuffer_active,
frontbuffer_retire,
I915_ACTIVE_RETIRE_SLEEPS);
spin_lock(&i915->frontbuffer_lock);
if (rcu_access_pointer(obj->frontbuffer)) {
cur = rcu_dereference_protected(obj->frontbuffer, true);
kref_get(&cur->ref);
} else {
cur = front;
rcu_assign_pointer(obj->frontbuffer, front);
}
spin_unlock(&i915->frontbuffer_lock);
if (cur != front) {
i915_gem_object_put(obj);
intel_frontbuffer_fini(&front->base);
kfree(front);
}
return cur;
}
void i915_gem_object_frontbuffer_ref(struct i915_frontbuffer *front)
{
kref_get(&front->ref);
}
static void frontbuffer_release(struct kref *ref)
__releases(&i915->frontbuffer_lock)
{
struct i915_frontbuffer *front =
container_of(ref, typeof(*front), ref);
struct drm_i915_gem_object *obj = front->obj;
struct drm_i915_private *i915 = to_i915(obj->base.dev);
i915_ggtt_clear_scanout(obj);
RCU_INIT_POINTER(obj->frontbuffer, NULL);
spin_unlock(&i915->frontbuffer_lock);
i915_active_fini(&front->write);
i915_gem_object_put(obj);
intel_frontbuffer_fini(&front->base);
kfree_rcu(front, rcu);
}
void i915_gem_object_frontbuffer_put(struct i915_frontbuffer *front)
{
struct drm_i915_private *i915 = to_i915(front->obj->base.dev);
kref_put_lock(&front->ref, frontbuffer_release,
&i915->frontbuffer_lock);
}
|
