Mesa (master): ac: fix num_good_cu_per_sh for harvested chips
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Mon Sep 30 17:40:01 UTC 2019
Module: Mesa
Branch: master
Commit: b7c2f7c5a6b21bccb7847ab03b7fba5c770e131c
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=b7c2f7c5a6b21bccb7847ab03b7fba5c770e131c
Author: Marek Olšák <marek.olsak at amd.com>
Date: Thu Sep 19 22:16:51 2019 -0400
ac: fix num_good_cu_per_sh for harvested chips
Cc: 19.2 <mesa-stable at lists.freedesktop.org>
Reviewed-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
---
src/amd/common/ac_gpu_info.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/src/amd/common/ac_gpu_info.c b/src/amd/common/ac_gpu_info.c
index b5e0b8415d2..689ef2740f3 100644
--- a/src/amd/common/ac_gpu_info.c
+++ b/src/amd/common/ac_gpu_info.c
@@ -554,6 +554,12 @@ bool ac_query_gpu_info(int fd, void *dev_p,
info->num_good_cu_per_sh = info->num_good_compute_units /
(info->max_se * info->max_sh_per_se);
+ /* Round down to the nearest multiple of 2, because the hw can't
+ * disable CUs. It can only disable whole WGPs (dual-CUs).
+ */
+ if (info->chip_class >= GFX10)
+ info->num_good_cu_per_sh -= info->num_good_cu_per_sh % 2;
+
memcpy(info->si_tile_mode_array, amdinfo->gb_tile_mode,
sizeof(amdinfo->gb_tile_mode));
info->enabled_rb_mask = amdinfo->enabled_rb_pipes_mask;
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