linux-kernel - Re: [PATCH] drm/amdgpu/gmc6: fix in case the PCI BAR is larger than the actual amount of vram

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Date:   Tue, 15 Aug 2023 11:50:04 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     hongao <hongao@...ontech.com>
Cc:     alexander.deucher@....com, Xinhui.Pan@....com, airlied@...il.com,
        daniel@...ll.ch, lijo.lazar@....com, mario.limonciello@....com,
        dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/amdgpu/gmc6: fix in case the PCI BAR is larger than
 the actual amount of vram

Applied.  Thanks!

On Tue, Aug 15, 2023 at 3:13 AM hongao <hongao@...ontech.com> wrote:
>
> [why]
> limit visible_vram_size to real_vram_size in case
> the PCI BAR is larger than the actual amount of vram.
>
> Signed-off-by: hongao <hongao@...ontech.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
> index b7dad4e67813..c0de7496bfd1 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
> @@ -320,6 +320,8 @@ static int gmc_v6_0_mc_init(struct amdgpu_device *adev)
>         adev->gmc.aper_base = pci_resource_start(adev->pdev, 0);
>         adev->gmc.aper_size = pci_resource_len(adev->pdev, 0);
>         adev->gmc.visible_vram_size = adev->gmc.aper_size;
> +       if (adev->gmc.visible_vram_size > adev->gmc.real_vram_size)
> +               adev->gmc.visible_vram_size = adev->gmc.real_vram_size;
>
>         /* set the gart size */
>         if (amdgpu_gart_size == -1) {
> --
> 2.20.1
>