AlexIndustrial/mesa
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ac: set LDS limit for TCS to 32K for all chips

Browse Source 
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34780>
This commit is contained in:
Marek Olšák
2025-04-30 16:42:27 -04:00
committed by Marge Bot
parent fa5e07d5f7
commit 5994e08f8b
1 changed files with 7 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/amd/common/ac_shader_util.c
+7 -4
View File
@@ -996,10 +996,13 @@ uint32_t ac_compute_num_tess_patches(const struct radeon_info *info, uint32_t nu
* use LDS for the inputs and outputs.
*/
if (lds_per_patch) {
const unsigned max_lds_size = (info->gfx_level >= GFX9 ? 64 * 1024 : 32 * 1024); /* hw limit */
/* Target at least 2 workgroups per CU. */
const unsigned target_lds_size = max_lds_size / 2 - AC_TESS_LEVEL_VOTE_LDS_BYTES;
num_patches = MIN2(num_patches, target_lds_size / lds_per_patch);
/* LS/HS can only access up to 32K on GFX6-8 and 64K on GFX9+.
*
* 32K performs the best. We could use 64K on GFX9+, but it doesn't perform well because
* 64K prevents GS and PS from running on the same CU.
*/
const unsigned max_lds_size = 32 * 1024 - AC_TESS_LEVEL_VOTE_LDS_BYTES;
num_patches = MIN2(num_patches, max_lds_size / lds_per_patch);
assert(num_patches * lds_per_patch <= max_lds_size);
}
num_patches = MAX2(num_patches, 1);