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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"
void _etna_bo_del(struct etna_bo *bo);
extern pthread_mutex_t etna_drm_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++;
}
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 etna_drm_table_lock */
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;
VG_BO_OBTAIN(bo);
list_del(&bo->list);
_etna_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(&etna_drm_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(&etna_drm_table_lock);
return bo;
}
/* allocate a new (un-tiled) buffer object
*
* NOTE: size is potentially rounded up to bucket size
*/
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) {
VG_BO_OBTAIN(bo);
p_atomic_set(&bo->refcnt, 1);
etna_device_ref(bo->dev);
return bo;
}
}
return NULL;
}
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;
VG_BO_RELEASE(bo);
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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