From: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com>
Date: Tue, 9 Dec 2025 14:29:28 +0000 (-0500)
Subject: drm/amdgpu: Set default xnack mode for gfx_v12.1 A0/B0
X-Git-Tag: v7.2-rc1~141^2~24^2~101
X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=bfeb7b28e9f8c5d16ab00b60b42559791b16a12c;p=thirdparty%2Fkernel%2Flinux.git

drm/amdgpu: Set default xnack mode for gfx_v12.1 A0/B0

For A0, default xnack mode is off
For BO, default xnack mode is on

Signed-off-by: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com>
Reviewed-by: Philip.Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
index f558c8a558423..f1d9e12ebfc7a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
@@ -1007,6 +1007,9 @@ void amdgpu_gmc_noretry_set(struct amdgpu_device *adev)
 				gc_ver == IP_VERSION(9, 5, 0) ||
 				gc_ver >= IP_VERSION(10, 3, 0));
 
+	/* For GFX12.1 B0, set xnack (retry) on as default */
+	if (gc_ver == IP_VERSION(12, 1, 0) && (adev->rev_id & 0xf) == 0x1)
+		noretry_default = false;
 	if (!amdgpu_sriov_xnack_support(adev))
 		gmc->noretry = 1;
 	else