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ac/nir: adjust performance-related decisions for clear/copy_buffer shader

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Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30208>
This commit is contained in:
Marek Olšák 2024-07-16 06:40:32 -04:00 • committed by Marge Bot
parent 361266fec7
commit db7823e8b9
1 changed files with 19 additions and 13 deletions
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32
src/amd/common/ac_nir_meta_cs_clear_copy_buffer.c
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@ -386,20 +386,26 @@ ac_prepare_cs_clear_copy_buffer(const struct ac_cs_clear_copy_buffer_options *op
*/
if (options->fail_if_slow && !info->render_condition_enabled && options->info->has_cp_dma &&
!options->info->cp_sdma_ge_use_system_memory_scope) {
if (is_copy) {
/* Only use compute for large VRAM copies on dGPUs. */
if (info->size <= 8192 || !options->info->has_dedicated_vram || !info->dst_is_vram ||
!info->src_is_vram)
return false;
} else {
/* Buffer clear.
*
* CP DMA clears are terribly slow with GTT on GFX6-8, which can be encountered with any
* buffer due to BO evictions, so never use CP DMA clears on GFX6-8. On GFX9+, use CP DMA
* clears if the size is small.
*/
if (options->info->gfx_level >= GFX9 && clear_value_size <= 4 && info->size <= 4096)
switch (options->info->gfx_level) {
case GFX11:
/* Verified on Navi31. */
if (is_copy && info->size < 1024 && info->dst_offset % 256 && info->dst_is_vram && info->src_is_vram)
return false;
break;
default:
if (is_copy) {
/* Only use compute for large VRAM copies on dGPUs. */
if (info->size <= 8192 || !options->info->has_dedicated_vram || !info->dst_is_vram ||
!info->src_is_vram)
return false;
} else {
/* CP DMA clears are terribly slow with GTT on GFX6-8, which can be encountered with
* any buffer due to BO evictions, so never use CP DMA clears on GFX6-8.
*/
if (options->info->gfx_level >= GFX9 && clear_value_size <= 4 && info->size <= 4096)
return false;
}
}
}