> -----Original Message-----
> From: amd-gfx [mailto:amd-gfx-boun...@lists.freedesktop.org] On Behalf
> Of Christian König
> Sent: Wednesday, November 15, 2017 3:13 PM
> To: amd-gfx@lists.freedesktop.org
> Subject: [PATCH] drm/amdgpu: require a root bus window above 4GB for
> BAR resize
>
> Don't even try to resize the BAR when there is no window above 4GB.
>
> Signed-off-by: Christian König <christian.koe...@amd.com>
Acked-by: Alex Deucher <alexander.deuc...@amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 18
> ++++++++++++++++++
> 1 file changed, 18 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 4944f8e1577b..b5a8afdcfb5d 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -765,6 +765,9 @@ int amdgpu_device_resize_fb_bar(struct
> amdgpu_device *adev)
> {
> u64 space_needed = roundup_pow_of_two(adev-
> >mc.real_vram_size);
> u32 rbar_size = order_base_2(((space_needed >> 20) | 1)) - 1;
> + struct pci_bus *root;
> + struct resource *res;
> + unsigned i;
> u16 cmd;
> int r;
>
> @@ -772,6 +775,21 @@ int amdgpu_device_resize_fb_bar(struct
> amdgpu_device *adev)
> if (amdgpu_sriov_vf(adev))
> return 0;
>
> + /* Check if the root BUS has 64bit memory resources */
> + root = adev->pdev->bus;
> + while (root->parent)
> + root = root->parent;
> +
> + pci_bus_for_each_resource(root, res, i) {
> + if (res && res->flags & IORESOURCE_MEM_64 &&
> + res->start > 0x100000000ull)
> + break;
> + }
> +
> + /* Trying to resize is pointless without a root hub window above 4GB
> */
> + if (!res)
> + 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,
> --
> 2.11.0
>
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