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/*
* Copyright 2019 Advanced Micro Devices, Inc.
* All Rights Reserved.
*
* 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
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
* THE AUTHOR(S) AND/OR THEIR SUPPLIERS 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.
*/
#include "util/u_live_shader_cache.h"
#include "util/u_inlines.h"
#include "tgsi/tgsi_from_mesa.h"
#include "tgsi/tgsi_parse.h"
#include "compiler/nir/nir_serialize.h"
#include "util/blob.h"
#include "util/hash_table.h"
#include "util/mesa-sha1.h"
static uint32_t key_hash(const void *key)
{
/* Take the first dword of SHA1. */
return *(uint32_t*)key;
}
static bool key_equals(const void *a, const void *b)
{
/* Compare SHA1s. */
return memcmp(a, b, 20) == 0;
}
void
util_live_shader_cache_init(struct util_live_shader_cache *cache,
void *(*create_shader)(struct pipe_context *,
const struct pipe_shader_state *state),
void (*destroy_shader)(struct pipe_context *, void *))
{
simple_mtx_init(&cache->lock, mtx_plain);
cache->hashtable = _mesa_hash_table_create(NULL, key_hash, key_equals);
cache->create_shader = create_shader;
cache->destroy_shader = destroy_shader;
}
void
util_live_shader_cache_deinit(struct util_live_shader_cache *cache)
{
if (cache->hashtable) {
/* The hash table should be empty at this point. */
_mesa_hash_table_destroy(cache->hashtable, NULL);
simple_mtx_destroy(&cache->lock);
}
}
void *
util_live_shader_cache_get(struct pipe_context *ctx,
struct util_live_shader_cache *cache,
const struct pipe_shader_state *state)
{
struct blob blob = {0};
unsigned ir_size;
const void *ir_binary;
enum pipe_shader_type stage;
/* Get the shader binary and shader stage. */
if (state->type == PIPE_SHADER_IR_TGSI) {
ir_binary = state->tokens;
ir_size = tgsi_num_tokens(state->tokens) *
sizeof(struct tgsi_token);
stage = tgsi_get_processor_type(state->tokens);
} else if (state->type == PIPE_SHADER_IR_NIR) {
blob_init(&blob);
nir_serialize(&blob, state->ir.nir, true);
ir_binary = blob.data;
ir_size = blob.size;
stage = pipe_shader_type_from_mesa(((nir_shader*)state->ir.nir)->info.stage);
} else {
assert(0);
return NULL;
}
/* Compute SHA1 of pipe_shader_state. */
struct mesa_sha1 sha1_ctx;
unsigned char sha1[20];
_mesa_sha1_init(&sha1_ctx);
_mesa_sha1_update(&sha1_ctx, ir_binary, ir_size);
if ((stage == PIPE_SHADER_VERTEX ||
stage == PIPE_SHADER_TESS_EVAL ||
stage == PIPE_SHADER_GEOMETRY) &&
state->stream_output.num_outputs) {
_mesa_sha1_update(&sha1_ctx, &state->stream_output,
sizeof(state->stream_output));
}
_mesa_sha1_final(&sha1_ctx, sha1);
if (ir_binary == blob.data)
blob_finish(&blob);
/* Find the shader in the live cache. */
simple_mtx_lock(&cache->lock);
struct hash_entry *entry = _mesa_hash_table_search(cache->hashtable, sha1);
struct util_live_shader *shader = entry ? entry->data : NULL;
/* Increase the refcount. */
if (shader) {
pipe_reference(NULL, &shader->reference);
cache->hits++;
}
simple_mtx_unlock(&cache->lock);
/* Return if the shader already exists. */
if (shader)
return shader;
/* The cache mutex is unlocked to allow multiple create_shader
* invocations to run simultaneously.
*/
shader = (struct util_live_shader*)cache->create_shader(ctx, state);
pipe_reference_init(&shader->reference, 1);
memcpy(shader->sha1, sha1, sizeof(sha1));
simple_mtx_lock(&cache->lock);
/* The same shader might have been created in parallel. This is rare.
* If so, keep the one already in cache.
*/
struct hash_entry *entry2 = _mesa_hash_table_search(cache->hashtable, sha1);
struct util_live_shader *shader2 = entry2 ? entry2->data : NULL;
if (shader2) {
cache->destroy_shader(ctx, shader);
shader = shader2;
/* Increase the refcount. */
pipe_reference(NULL, &shader->reference);
} else {
_mesa_hash_table_insert(cache->hashtable, shader->sha1, shader);
}
cache->misses++;
simple_mtx_unlock(&cache->lock);
return shader;
}
void
util_shader_reference(struct pipe_context *ctx,
struct util_live_shader_cache *cache,
void **dst, void *src)
{
if (*dst == src)
return;
struct util_live_shader *dst_shader = (struct util_live_shader*)*dst;
struct util_live_shader *src_shader = (struct util_live_shader*)src;
simple_mtx_lock(&cache->lock);
bool destroy = pipe_reference(&dst_shader->reference, &src_shader->reference);
if (destroy) {
struct hash_entry *entry = _mesa_hash_table_search(cache->hashtable,
dst_shader->sha1);
assert(entry);
_mesa_hash_table_remove(cache->hashtable, entry);
}
simple_mtx_unlock(&cache->lock);
if (destroy)
cache->destroy_shader(ctx, dst_shader);
*dst = src;
}
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