From: Mukul Joshi <mukul.joshi@amd.com>
Date: Thu, 21 Aug 2025 17:51:57 +0000 (-0400)
Subject: drm/amdgpu: Always set snoop bit in PDE on GFX 12.1
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b8c27208b28768e8a6162f69a05508ded61f03ac;p=thirdparty%2Fkernel%2Flinux.git

drm/amdgpu: Always set snoop bit in PDE on GFX 12.1

GFX 12.1 has the requirement to always set snoop bit in PDE
to maintain coherency.

Signed-off-by: Mukul Joshi <mukul.joshi@amd.com>
Reviewed-by: Alex Sierra <alex.sierra@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v12_1.c b/drivers/gpu/drm/amd/amdgpu/gmc_v12_1.c
index 347be0ef07ec8..ae08f8b3bfbc1 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v12_1.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v12_1.c
@@ -249,6 +249,8 @@ static void gmc_v12_1_get_vm_pde(struct amdgpu_device *adev, int level,
 			adev->gmc.vram_start;
 	BUG_ON(*addr & 0xFFFF00000000003FULL);
 
+	*flags |= AMDGPU_PTE_SNOOPED;
+
 	if (!adev->gmc.translate_further)
 		return;