On Thu, May 21, 2020 at 4:48 PM Alan Swanson <reiver@xxxxxxxxxxxxxxxxx> wrote:
>
> Try to resize BAR0 to let CPU access all of VRAM on Navi. Syncs
> code with previous gfx generations from commit d6895ad39f3b39
> ("drm/amdgpu: resize VRAM BAR for CPU access v6").
>
> Signed-off-by: Alan Swanson <reiver@xxxxxxxxxxxxxxxxx>
Tested and applied. Thanks!
Alex
> ---
> Unfortunately cannot test this with my RX5700 on my AMD X470
> motherboard as its BIOS "Above 4G decoding" option does not
> remap the PCI root bus. Trying "pci=nocrs" also unsuccessful.
> However, I assume it's just absent due to missed commit
> overlap during gfx10 bring up and should work.
>
> drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c | 14 ++++++++++----
> 1 file changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
> index edaa50d85..ba2b7ac0c 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
> @@ -686,17 +686,23 @@ static void gmc_v10_0_vram_gtt_location(struct amdgpu_device *adev,
> */
> static int gmc_v10_0_mc_init(struct amdgpu_device *adev)
> {
> - /* Could aper size report 0 ? */
> - adev->gmc.aper_base = pci_resource_start(adev->pdev, 0);
> - adev->gmc.aper_size = pci_resource_len(adev->pdev, 0);
> + int r;
>
> /* size in MB on si */
> adev->gmc.mc_vram_size =
> adev->nbio.funcs->get_memsize(adev) * 1024ULL * 1024ULL;
> adev->gmc.real_vram_size = adev->gmc.mc_vram_size;
> - adev->gmc.visible_vram_size = adev->gmc.aper_size;
> +
> + if (!(adev->flags & AMD_IS_APU)) {
> + r = amdgpu_device_resize_fb_bar(adev);
> + if (r)
> + return r;
> + }
> + adev->gmc.aper_base = pci_resource_start(adev->pdev, 0);
> + adev->gmc.aper_size = pci_resource_len(adev->pdev, 0);
>
> /* In case the PCI BAR is larger than the actual amount of vram */
> + 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;
>
> --
> 2.26.2
>
> _______________________________________________
> amd-gfx mailing list
> amd-gfx@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/amd-gfx
_______________________________________________
amd-gfx mailing list
amd-gfx@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/amd-gfx
