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    Subject[PATCH 6.0 741/862] drm/amdgpu: Skip the program of MMMC_VM_AGP_* in SRIOV on MMHUB v3_0_0
    Date
    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


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