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- /*
- * Copyright (C) 2016 Etnaviv Project
- *
- * 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:
- * Christian Gmeiner <christian.gmeiner@gmail.com>
- */
- #include "etnaviv_priv.h"
- #include "etnaviv_drmif.h"
- drm_private void bo_del(struct etna_bo *bo);
- drm_private extern pthread_mutex_t table_lock;
- static void add_bucket(struct etna_bo_cache *cache, int size)
- {
- unsigned 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++;
- }
- drm_private void etna_bo_cache_init(struct etna_bo_cache *cache)
- {
- 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);
- 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);
- 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 etna_bo_cache_cleanup(struct etna_bo_cache *cache, time_t time)
- {
- unsigned i;
- if (cache->time == time)
- return;
- for (i = 0; i < cache->num_buckets; i++) {
- struct etna_bo_bucket *bucket = &cache->cache_bucket[i];
- struct etna_bo *bo;
- while (!LIST_IS_EMPTY(&bucket->list)) {
- bo = LIST_ENTRY(struct etna_bo, bucket->list.next, list);
- /* keep things in cache for at least 1 second: */
- if (time && ((time - bo->free_time) <= 1))
- break;
- list_del(&bo->list);
- bo_del(bo);
- }
- }
- cache->time = time;
- }
- static struct etna_bo_bucket *get_bucket(struct etna_bo_cache *cache, uint32_t size)
- {
- unsigned 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 etna_bo_bucket *bucket = &cache->cache_bucket[i];
- if (bucket->size >= size) {
- return bucket;
- }
- }
- return NULL;
- }
- static int is_idle(struct etna_bo *bo)
- {
- return etna_bo_cpu_prep(bo,
- DRM_ETNA_PREP_READ |
- DRM_ETNA_PREP_WRITE |
- DRM_ETNA_PREP_NOSYNC) == 0;
- }
- static struct etna_bo *find_in_bucket(struct etna_bo_bucket *bucket, uint32_t flags)
- {
- struct etna_bo *bo = NULL, *tmp;
- pthread_mutex_lock(&table_lock);
- if (LIST_IS_EMPTY(&bucket->list))
- goto out_unlock;
- LIST_FOR_EACH_ENTRY_SAFE(bo, tmp, &bucket->list, list) {
- /* skip BOs with different flags */
- if (bo->flags != flags)
- continue;
- /* check if the first BO with matching flags is idle */
- if (is_idle(bo)) {
- list_delinit(&bo->list);
- goto out_unlock;
- }
- /* If the oldest BO is still busy, don't try younger ones */
- break;
- }
- /* There was no matching buffer found */
- bo = NULL;
- out_unlock:
- pthread_mutex_unlock(&table_lock);
- return bo;
- }
- /* allocate a new (un-tiled) buffer object
- *
- * NOTE: size is potentially rounded up to bucket size
- */
- drm_private struct etna_bo *etna_bo_cache_alloc(struct etna_bo_cache *cache, uint32_t *size,
- uint32_t flags)
- {
- struct etna_bo *bo;
- struct etna_bo_bucket *bucket;
- *size = ALIGN(*size, 4096);
- bucket = get_bucket(cache, *size);
- /* see if we can be green and recycle: */
- if (bucket) {
- *size = bucket->size;
- bo = find_in_bucket(bucket, flags);
- if (bo) {
- atomic_set(&bo->refcnt, 1);
- etna_device_ref(bo->dev);
- return bo;
- }
- }
- return NULL;
- }
- drm_private int etna_bo_cache_free(struct etna_bo_cache *cache, struct etna_bo *bo)
- {
- struct etna_bo_bucket *bucket = get_bucket(cache, bo->size);
- /* see if we can be green and recycle: */
- if (bucket) {
- struct timespec time;
- clock_gettime(CLOCK_MONOTONIC, &time);
- bo->free_time = time.tv_sec;
- list_addtail(&bo->list, &bucket->list);
- etna_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:
- */
- etna_device_del_locked(bo->dev);
- return 0;
- }
- return -1;
- }
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