aboutsummaryrefslogtreecommitdiffstats
blob: d922f3a90d4221c4279cb77c1eef888713841c16 (plain) (blame)
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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
/* -*- mode: C; c-file-style: "k&r"; tab-width 4; indent-tabs-mode: t; -*- */

/*
 * Copyright (C) 2016 Rob Clark <robclark@freedesktop.org>
 *
 * 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 (including the next
 * paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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:
 *    Rob Clark <robclark@freedesktop.org>
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include "freedreno_drmif.h"
#include "freedreno_priv.h"

drm_private void bo_del(struct fd_bo *bo);
drm_private extern pthread_mutex_t table_lock;

static void
add_bucket(struct fd_bo_cache *cache, int size)
{
	unsigned int i = cache->num_buckets;

	assert(i < ARRAY_SIZE(cache->cache_bucket));

	list_inithead(&cache->cache_bucket[i].list);
	cache->cache_bucket[i].size = size;
	cache->num_buckets++;
}

/**
 * @coarse: if true, only power-of-two bucket sizes, otherwise
 *    fill in for a bit smoother size curve..
 */
drm_private void
fd_bo_cache_init(struct fd_bo_cache *cache, int course)
{
	unsigned long size, cache_max_size = 64 * 1024 * 1024;

	/* OK, so power of two buckets was too wasteful of memory.
	 * Give 3 other sizes between each power of two, to hopefully
	 * cover things accurately enough.  (The alternative is
	 * probably to just go for exact matching of sizes, and assume
	 * that for things like composited window resize the tiled
	 * width/height alignment and rounding of sizes to pages will
	 * get us useful cache hit rates anyway)
	 */
	add_bucket(cache, 4096);
	add_bucket(cache, 4096 * 2);
	if (!course)
		add_bucket(cache, 4096 * 3);

	/* Initialize the linked lists for BO reuse cache. */
	for (size = 4 * 4096; size <= cache_max_size; size *= 2) {
		add_bucket(cache, size);
		if (!course) {
			add_bucket(cache, size + size * 1 / 4);
			add_bucket(cache, size + size * 2 / 4);
			add_bucket(cache, size + size * 3 / 4);
		}
	}
}

/* Frees older cached buffers.  Called under table_lock */
drm_private void
fd_bo_cache_cleanup(struct fd_bo_cache *cache, time_t time)
{
	int i;

	if (cache->time == time)
		return;

	for (i = 0; i < cache->num_buckets; i++) {
		struct fd_bo_bucket *bucket = &cache->cache_bucket[i];
		struct fd_bo *bo;

		while (!LIST_IS_EMPTY(&bucket->list)) {
			bo = LIST_ENTRY(struct fd_bo, bucket->list.next, list);

			/* keep things in cache for at least 1 second: */
			if (time && ((time - bo->free_time) <= 1))
				break;

			VG_BO_OBTAIN(bo);
			list_del(&bo->list);
			bo_del(bo);
		}
	}

	cache->time = time;
}

static struct fd_bo_bucket * get_bucket(struct fd_bo_cache *cache, uint32_t size)
{
	int i;

	/* hmm, this is what intel does, but I suppose we could calculate our
	 * way to the correct bucket size rather than looping..
	 */
	for (i = 0; i < cache->num_buckets; i++) {
		struct fd_bo_bucket *bucket = &cache->cache_bucket[i];
		if (bucket->size >= size) {
			return bucket;
		}
	}

	return NULL;
}

static int is_idle(struct fd_bo *bo)
{
	return fd_bo_cpu_prep(bo, NULL,
			DRM_FREEDRENO_PREP_READ |
			DRM_FREEDRENO_PREP_WRITE |
			DRM_FREEDRENO_PREP_NOSYNC) == 0;
}

static struct fd_bo *find_in_bucket(struct fd_bo_bucket *bucket, uint32_t flags)
{
	struct fd_bo *bo = NULL;

	/* TODO .. if we had an ALLOC_FOR_RENDER flag like intel, we could
	 * skip the busy check.. if it is only going to be a render target
	 * then we probably don't need to stall..
	 *
	 * NOTE that intel takes ALLOC_FOR_RENDER bo's from the list tail
	 * (MRU, since likely to be in GPU cache), rather than head (LRU)..
	 */
	pthread_mutex_lock(&table_lock);
	if (!LIST_IS_EMPTY(&bucket->list)) {
		bo = LIST_ENTRY(struct fd_bo, bucket->list.next, list);
		/* TODO check for compatible flags? */
		if (is_idle(bo)) {
			list_del(&bo->list);
		} else {
			bo = NULL;
		}
	}
	pthread_mutex_unlock(&table_lock);

	return bo;
}

/* NOTE: size is potentially rounded up to bucket size: */
drm_private struct fd_bo *
fd_bo_cache_alloc(struct fd_bo_cache *cache, uint32_t *size, uint32_t flags)
{
	struct fd_bo *bo = NULL;
	struct fd_bo_bucket *bucket;

	*size = ALIGN(*size, 4096);
	bucket = get_bucket(cache, *size);

	/* see if we can be green and recycle: */
retry:
	if (bucket) {
		*size = bucket->size;
		bo = find_in_bucket(bucket, flags);
		if (bo) {
			VG_BO_OBTAIN(bo);
			if (bo->funcs->madvise(bo, TRUE) <= 0) {
				/* we've lost the backing pages, delete and try again: */
				pthread_mutex_lock(&table_lock);
				bo_del(bo);
				pthread_mutex_unlock(&table_lock);
				goto retry;
			}
			atomic_set(&bo->refcnt, 1);
			fd_device_ref(bo->dev);
			return bo;
		}
	}

	return NULL;
}

drm_private int
fd_bo_cache_free(struct fd_bo_cache *cache, struct fd_bo *bo)
{
	struct fd_bo_bucket *bucket = get_bucket(cache, bo->size);

	/* see if we can be green and recycle: */
	if (bucket) {
		struct timespec time;

		bo->funcs->madvise(bo, FALSE);

		clock_gettime(CLOCK_MONOTONIC, &time);

		bo->free_time = time.tv_sec;
		VG_BO_RELEASE(bo);
		list_addtail(&bo->list, &bucket->list);
		fd_bo_cache_cleanup(cache, time.tv_sec);

		/* bo's in the bucket cache don't have a ref and
		 * don't hold a ref to the dev:
		 */
		fd_device_del_locked(bo->dev);

		return 0;
	}

	return -1;
}