[PATCH AUTOSEL 5.19 11/36] drm/amdgpu: Skip the program of MMMC_VM_AGP_* in SRIOV on MMHUB v3_0_0

Sasha Levin
2022-10-10T00:18:18Z

From: Yifan Zha <Yifan.Zha@amd.com>

[ Upstream commit c1026c6f319724dc88fc08d9d9d35bcbdf492b42 ]

[Why]
VF should not program these registers, the value were defined in the host.

[How]
Skip writing them in SRIOV environment and program them on host side.

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/amd/amdgpu/mmhub_v3_0.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/mmhub_v3_0.c b/drivers/gpu/drm/amd/amdgpu/mmhub_v3_0.c
index bc11b2de37ae..a1d26c4d80b8 100644
--- a/drivers/gpu/drm/amd/amdgpu/mmhub_v3_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/mmhub_v3_0.c
@@ -169,17 +169,17 @@ static void mmhub_v3_0_init_system_aperture_regs(struct amdgpu_device *adev)
uint64_t value;
uint32_t tmp;

- /* Disable AGP. */
- WREG32_SOC15(MMHUB, 0, regMMMC_VM_AGP_BASE, 0);
- WREG32_SOC15(MMHUB, 0, regMMMC_VM_AGP_TOP, 0);
- WREG32_SOC15(MMHUB, 0, regMMMC_VM_AGP_BOT, 0x00FFFFFF);
-
if (!amdgpu_sriov_vf(adev)) {
/*
* the new L1 policy will block SRIOV guest from writing
* these regs, and they will be programed at host.
* so skip programing these regs.
*/
+ /* Disable AGP. */
+ WREG32_SOC15(MMHUB, 0, regMMMC_VM_AGP_BASE, 0);
+ WREG32_SOC15(MMHUB, 0, regMMMC_VM_AGP_TOP, 0);
+ WREG32_SOC15(MMHUB, 0, regMMMC_VM_AGP_BOT, 0x00FFFFFF);
+
/* Program the system aperture low logical page number. */
WREG32_SOC15(MMHUB, 0, regMMMC_VM_SYSTEM_APERTURE_LOW_ADDR,
adev->gmc.vram_start >> 18);
--
2.35.1