From: Marek Olšák Date: Sat, 29 Jul 2017 15:19:01 +0000 (+0200) Subject: ac/surface: align DCC size for surfaces that use tile swizzle X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=c60c5accd1b20514dbbbbab7ac40004ad7122b44;p=mesa.git ac/surface: align DCC size for surfaces that use tile swizzle Note that dcc_alignment = pipe_interleave_bytes * num_pipes * num_banks, which is greater than the previous open-coded alignment. Reviewed-by: Dave Airlie Reviewed-by: Nicolai Hähnle --- diff --git a/src/amd/common/ac_surface.c b/src/amd/common/ac_surface.c index 3716d3ddb04..823a65d038f 100644 --- a/src/amd/common/ac_surface.c +++ b/src/amd/common/ac_surface.c @@ -734,9 +734,16 @@ static int gfx6_compute_surface(ADDR_HANDLE addrlib, * complicated. */ if (surf->dcc_size && config->info.levels > 1) { + /* The smallest miplevels that are never compressed by DCC + * still read the DCC buffer via TC if the base level uses DCC, + * and for some reason the DCC buffer needs to be larger if + * the miptree uses non-zero tile_swizzle. Otherwise there are + * VM faults. + * + * "dcc_alignment * 4" was determined by trial and error. + */ surf->dcc_size = align64(surf->surf_size >> 8, - info->pipe_interleave_bytes * - info->num_tile_pipes); + surf->dcc_alignment * 4); } /* Make sure HTILE covers the whole miptree, because the shader reads