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radeonsi: fix applying the NGG minimum vertex count requirement

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The code applied the restriction too late, which could overflow LDS size,
which started happening more often after the minimum vertex count was
increased for Sienna.

Incorporate the clamping into the previous code for rounding up the counts.
Now the LDS size can never overflow, but it may use vector lanes less
efficiently (max_gsprims can be decreased more), which will be addressed
in the next commit.

Fixes: 4ecc39e1aa ("radeonsi/gfx10: NGG geometry shader PM4 and upload")

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6137>
This commit is contained in:
Marek Olšák 2020-07-30 08:19:48 -04:00
parent 7a468fc0f6
commit 64c741ffb7
1 changed files with 8 additions and 3 deletions
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11
src/gallium/drivers/radeonsi/gfx10_shader_ngg.c
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@ -2022,6 +2022,8 @@ retry_select_mode:
max_esverts =
MIN2(max_esverts, (max_lds_size - max_gsprims * gsprim_lds_size) / esvert_lds_size);
max_esverts = MIN2(max_esverts, max_gsprims * max_verts_per_prim);
/* Hardware restriction: minimum value of max_esverts */
max_esverts = MAX2(max_esverts, min_esverts - 1 + max_verts_per_prim);
max_gsprims = align(max_gsprims, wavesize);
max_gsprims = MIN2(max_gsprims, max_gsprims_base);
@ -2031,10 +2033,13 @@ retry_select_mode:
clamp_gsprims_to_esverts(&max_gsprims, max_esverts, min_verts_per_prim, use_adjacency);
assert(max_esverts >= max_verts_per_prim && max_gsprims >= 1);
} while (orig_max_esverts != max_esverts || orig_max_gsprims != max_gsprims);
}
/* Hardware restriction: minimum value of max_esverts */
max_esverts = MAX2(max_esverts, min_esverts - 1 + max_verts_per_prim);
/* Verify the restriction. */
assert(max_esverts >= min_esverts - 1 + max_verts_per_prim);
} else {
/* Hardware restriction: minimum value of max_esverts */
max_esverts = MAX2(max_esverts, min_esverts - 1 + max_verts_per_prim);
}
unsigned max_out_vertices =
max_vert_out_per_gs_instance