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
171
172
173
174
175
176
177
178
179
|
/*
* SPDX-License-Identifier: MIT
*
* Copyright © 2014-2018 Intel Corporation
*/
#include "gem/i915_gem_object.h"
#include "i915_drv.h"
#include "intel_engine_pm.h"
#include "intel_engine_pool.h"
static struct intel_engine_cs *to_engine(struct intel_engine_pool *pool)
{
return container_of(pool, struct intel_engine_cs, pool);
}
static struct list_head *
bucket_for_size(struct intel_engine_pool *pool, size_t sz)
{
int n;
/*
* Compute a power-of-two bucket, but throw everything greater than
* 16KiB into the same bucket: i.e. the buckets hold objects of
* (1 page, 2 pages, 4 pages, 8+ pages).
*/
n = fls(sz >> PAGE_SHIFT) - 1;
if (n >= ARRAY_SIZE(pool->cache_list))
n = ARRAY_SIZE(pool->cache_list) - 1;
return &pool->cache_list[n];
}
static void node_free(struct intel_engine_pool_node *node)
{
i915_gem_object_put(node->obj);
i915_active_fini(&node->active);
kfree(node);
}
static int pool_active(struct i915_active *ref)
{
struct intel_engine_pool_node *node =
container_of(ref, typeof(*node), active);
struct dma_resv *resv = node->obj->base.resv;
int err;
if (dma_resv_trylock(resv)) {
dma_resv_add_excl_fence(resv, NULL);
dma_resv_unlock(resv);
}
err = i915_gem_object_pin_pages(node->obj);
if (err)
return err;
/* Hide this pinned object from the shrinker until retired */
i915_gem_object_make_unshrinkable(node->obj);
return 0;
}
static void pool_retire(struct i915_active *ref)
{
struct intel_engine_pool_node *node =
container_of(ref, typeof(*node), active);
struct intel_engine_pool *pool = node->pool;
struct list_head *list = bucket_for_size(pool, node->obj->base.size);
unsigned long flags;
GEM_BUG_ON(!intel_engine_pm_is_awake(to_engine(pool)));
i915_gem_object_unpin_pages(node->obj);
/* Return this object to the shrinker pool */
i915_gem_object_make_purgeable(node->obj);
spin_lock_irqsave(&pool->lock, flags);
list_add(&node->link, list);
spin_unlock_irqrestore(&pool->lock, flags);
}
static struct intel_engine_pool_node *
node_create(struct intel_engine_pool *pool, size_t sz)
{
struct intel_engine_cs *engine = to_engine(pool);
struct intel_engine_pool_node *node;
struct drm_i915_gem_object *obj;
node = kmalloc(sizeof(*node),
GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
if (!node)
return ERR_PTR(-ENOMEM);
node->pool = pool;
i915_active_init(engine->i915, &node->active, pool_active, pool_retire);
obj = i915_gem_object_create_internal(engine->i915, sz);
if (IS_ERR(obj)) {
i915_active_fini(&node->active);
kfree(node);
return ERR_CAST(obj);
}
i915_gem_object_set_readonly(obj);
node->obj = obj;
return node;
}
struct intel_engine_pool_node *
intel_engine_pool_get(struct intel_engine_pool *pool, size_t size)
{
struct intel_engine_pool_node *node;
struct list_head *list;
unsigned long flags;
int ret;
GEM_BUG_ON(!intel_engine_pm_is_awake(to_engine(pool)));
size = PAGE_ALIGN(size);
list = bucket_for_size(pool, size);
spin_lock_irqsave(&pool->lock, flags);
list_for_each_entry(node, list, link) {
if (node->obj->base.size < size)
continue;
list_del(&node->link);
break;
}
spin_unlock_irqrestore(&pool->lock, flags);
if (&node->link == list) {
node = node_create(pool, size);
if (IS_ERR(node))
return node;
}
ret = i915_active_acquire(&node->active);
if (ret) {
node_free(node);
return ERR_PTR(ret);
}
return node;
}
void intel_engine_pool_init(struct intel_engine_pool *pool)
{
int n;
spin_lock_init(&pool->lock);
for (n = 0; n < ARRAY_SIZE(pool->cache_list); n++)
INIT_LIST_HEAD(&pool->cache_list[n]);
}
void intel_engine_pool_park(struct intel_engine_pool *pool)
{
int n;
for (n = 0; n < ARRAY_SIZE(pool->cache_list); n++) {
struct list_head *list = &pool->cache_list[n];
struct intel_engine_pool_node *node, *nn;
list_for_each_entry_safe(node, nn, list, link)
node_free(node);
INIT_LIST_HEAD(list);
}
}
void intel_engine_pool_fini(struct intel_engine_pool *pool)
{
int n;
for (n = 0; n < ARRAY_SIZE(pool->cache_list); n++)
GEM_BUG_ON(!list_empty(&pool->cache_list[n]));
}
|
