2 * Copyright (C) 2016 Etnaviv Project
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24 * Christian Gmeiner <christian.gmeiner@gmail.com>
31 #include "etnaviv_priv.h"
32 #include "etnaviv_drmif.h"
34 drm_private void bo_del(struct etna_bo *bo);
35 drm_private extern pthread_mutex_t table_lock;
37 static void add_bucket(struct etna_bo_cache *cache, int size)
39 unsigned i = cache->num_buckets;
41 assert(i < ARRAY_SIZE(cache->cache_bucket));
43 list_inithead(&cache->cache_bucket[i].list);
44 cache->cache_bucket[i].size = size;
48 drm_private void etna_bo_cache_init(struct etna_bo_cache *cache)
50 unsigned long size, cache_max_size = 64 * 1024 * 1024;
52 /* OK, so power of two buckets was too wasteful of memory.
53 * Give 3 other sizes between each power of two, to hopefully
54 * cover things accurately enough. (The alternative is
55 * probably to just go for exact matching of sizes, and assume
56 * that for things like composited window resize the tiled
57 * width/height alignment and rounding of sizes to pages will
58 * get us useful cache hit rates anyway)
60 add_bucket(cache, 4096);
61 add_bucket(cache, 4096 * 2);
62 add_bucket(cache, 4096 * 3);
64 /* Initialize the linked lists for BO reuse cache. */
65 for (size = 4 * 4096; size <= cache_max_size; size *= 2) {
66 add_bucket(cache, size);
67 add_bucket(cache, size + size * 1 / 4);
68 add_bucket(cache, size + size * 2 / 4);
69 add_bucket(cache, size + size * 3 / 4);
73 /* Frees older cached buffers. Called under table_lock */
74 drm_private void etna_bo_cache_cleanup(struct etna_bo_cache *cache, time_t time)
78 if (cache->time == time)
81 for (i = 0; i < cache->num_buckets; i++) {
82 struct etna_bo_bucket *bucket = &cache->cache_bucket[i];
85 while (!LIST_IS_EMPTY(&bucket->list)) {
86 bo = LIST_ENTRY(struct etna_bo, bucket->list.next, list);
88 /* keep things in cache for at least 1 second: */
89 if (time && ((time - bo->free_time) <= 1))
100 static struct etna_bo_bucket *get_bucket(struct etna_bo_cache *cache, uint32_t size)
104 /* hmm, this is what intel does, but I suppose we could calculate our
105 * way to the correct bucket size rather than looping..
107 for (i = 0; i < cache->num_buckets; i++) {
108 struct etna_bo_bucket *bucket = &cache->cache_bucket[i];
109 if (bucket->size >= size) {
117 static int is_idle(struct etna_bo *bo)
119 return etna_bo_cpu_prep(bo,
121 DRM_ETNA_PREP_WRITE |
122 DRM_ETNA_PREP_NOSYNC) == 0;
125 static struct etna_bo *find_in_bucket(struct etna_bo_bucket *bucket, uint32_t flags)
127 struct etna_bo *bo = NULL;
129 pthread_mutex_lock(&table_lock);
130 while (!LIST_IS_EMPTY(&bucket->list)) {
131 bo = LIST_ENTRY(struct etna_bo, bucket->list.next, list);
133 if (bo->flags == flags && is_idle(bo)) {
141 pthread_mutex_unlock(&table_lock);
146 /* allocate a new (un-tiled) buffer object
148 * NOTE: size is potentially rounded up to bucket size
150 drm_private struct etna_bo *etna_bo_cache_alloc(struct etna_bo_cache *cache, uint32_t *size,
154 struct etna_bo_bucket *bucket;
156 *size = ALIGN(*size, 4096);
157 bucket = get_bucket(cache, *size);
159 /* see if we can be green and recycle: */
161 *size = bucket->size;
162 bo = find_in_bucket(bucket, flags);
164 atomic_set(&bo->refcnt, 1);
165 etna_device_ref(bo->dev);
173 drm_private int etna_bo_cache_free(struct etna_bo_cache *cache, struct etna_bo *bo)
175 struct etna_bo_bucket *bucket = get_bucket(cache, bo->size);
177 /* see if we can be green and recycle: */
179 struct timespec time;
181 clock_gettime(CLOCK_MONOTONIC, &time);
183 bo->free_time = time.tv_sec;
184 list_addtail(&bo->list, &bucket->list);
185 etna_bo_cache_cleanup(cache, time.tv_sec);
187 /* bo's in the bucket cache don't have a ref and
188 * don't hold a ref to the dev:
190 etna_device_del_locked(bo->dev);