[PATCH] drm/amdgpu: bypass FB resizing for SRIOV VF

[Christian König]

Am 07.11.2017 um 04:08 schrieb Pixel Ding:
> From: pding <Pixel.Ding at amd.com>
>
> It introduces 900ms latency in exclusive mode which causes failure
> of driver loading. Host can resize the BAR before guest staring,
> so the resizing is not necessary here.
>
> Signed-off-by: pding <Pixel.Ding at amd.com>

Reviewed-by: Christian König <christian.koenig at amd.com>

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 4 ++++
>   1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 6f01dda..bf2b008 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -768,6 +768,10 @@ int amdgpu_device_resize_fb_bar(struct amdgpu_device *adev)
>   	u16 cmd;
>   	int r;
>   
> +	/* Bypass for VF */
> +	if (amdgpu_sriov_vf(adev))
> +		return 0;
> +
>   	/* Disable memory decoding while we change the BAR addresses and size */
>   	pci_read_config_word(adev->pdev, PCI_COMMAND, &cmd);
>   	pci_write_config_word(adev->pdev, PCI_COMMAND,