From: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Date: Tue, 25 Jun 2019 10:05:35 +0000 (+0200)
Subject: radv/gfx10: fix a possible hang with exp pos0 with done=0 and exec=0
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=34b185cc43736c3c4e7cd9d6bb994517f688ec71;p=mesa.git

radv/gfx10: fix a possible hang with exp pos0 with done=0 and exec=0

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
---

diff --git a/src/amd/vulkan/radv_nir_to_llvm.c b/src/amd/vulkan/radv_nir_to_llvm.c
index e310c5c495e..bf5571f30c7 100644
--- a/src/amd/vulkan/radv_nir_to_llvm.c
+++ b/src/amd/vulkan/radv_nir_to_llvm.c
@@ -2989,6 +2989,14 @@ handle_vs_outputs_post(struct radv_shader_context *ctx,
 			num_pos_exports++;
 	}
 
+	/* Navi10-14 skip POS0 exports if EXEC=0 and DONE=0, causing a hang.
+	 * Setting valid_mask=1 prevents it and has no other effect.
+	 */
+	if (ctx->ac.family == CHIP_NAVI10 ||
+	    ctx->ac.family == CHIP_NAVI12 ||
+	    ctx->ac.family == CHIP_NAVI14)
+		pos_args[0].valid_mask = 1;
+
 	pos_idx = 0;
 	for (i = 0; i < 4; i++) {
 		if (!pos_args[i].out[0])