From 7a529db84b208565f8b83ecaa8eab934f42790ff Mon Sep 17 00:00:00 2001
From: Yifan Zha <Yifan.Zha@amd.com>
Date: Wed, 27 Jul 2022 14:43:32 +0800
Subject: drm/amdgpu: Skip the VRAM base offset on SRIOV
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Git-commit: 40ad3e545b3da75f107450d32bcad8346fce5dcc
Patch-mainline: v6.1-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225 jsc#PED-2849
[Why]
As VF cannot read MMMC_VM_FB_OFFSET with L1 Policy(read 0xffffffff).
It leads to driver get the incorrect vram base offset.
[How]
Since SR-IOV is dGPU only, skip reading this register and set the
fb_offest to 0.
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Yifan Zha <Yifan.Zha@amd.com>
Signed-off-by: Horace Chen <horace.chen@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c
index 592729cb0f48..846ccb6cf07d 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c
@@ -649,7 +649,10 @@ static void gmc_v11_0_vram_gtt_location(struct amdgpu_device *adev,
amdgpu_gmc_gart_location(adev, mc);
/* base offset of vram pages */
- adev->vm_manager.vram_base_offset = adev->mmhub.funcs->get_mc_fb_offset(adev);
+ if (amdgpu_sriov_vf(adev))
+ adev->vm_manager.vram_base_offset = 0;
+ else
+ adev->vm_manager.vram_base_offset = adev->mmhub.funcs->get_mc_fb_offset(adev);
}
/**
--
2.38.1