On Mon, Mar 6, 2017 at 1:40 PM, Christian König <deathsimple at vodafone.de> wrote:
> From: Christian König <christian.koenig at amd.com>
>
> Try to resize BAR0 to let CPU access all of VRAM.
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -616,6 +616,35 @@ void amdgpu_gtt_location(struct amdgpu_device *adev, struct amdgpu_mc *mc)
> +void amdgpu_resize_bar0(struct amdgpu_device *adev)
> +{
> + u32 size = max(ilog2(adev->mc.real_vram_size - 1) + 1, 20) - 20;
Too complicated.
unsigned long = fls_long(real_vram_size | BIT(20));
And the result is not a size, right? It's a logarithm from size.
> + int r;
> +
> + r = pci_resize_resource(adev->pdev, 0, size);
> +
Redundant line.
> + if (r == -ENOTSUPP) {
> + /* The hardware don't support the extension. */
> + return;
> +
> + } else if (r == -ENOSPC) {
> + DRM_INFO("Not enoigh PCI address space for a large BAR.");
> + } else if (r) {
> + DRM_ERROR("Problem resizing BAR0 (%d).", r);
> + }
> +
> + /* Reinit the doorbell mapping, it is most likely moved as well */
> + amdgpu_doorbell_fini(adev);
> + BUG_ON(amdgpu_doorbell_init(adev));
No way to recover?!
> +}
> +
--
With Best Regards,
Andy Shevchenko
