Re: [PATCH v2 08/11] drm/xe: Remove driver side BAR release before resize

Alex Bennée
2025-11-17T13:22:58Z

Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> writes:

> PCI core handles releasing device's resources and their rollback in
> case of failure of a BAR resizing operation. Releasing resource prior
> to calling pci_resize_resource() prevents PCI core from restoring the
> BARs as they were.
>
> Remove driver-side release of BARs from the xe driver.
>
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
> Cc: Lucas De Marchi <lucas.demarchi@intel.com>
> ---
> drivers/gpu/drm/xe/xe_vram.c | 3 ---
> 1 file changed, 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/xe/xe_vram.c b/drivers/gpu/drm/xe/xe_vram.c
> index 00dd027057df..5aacab9358a4 100644
> --- a/drivers/gpu/drm/xe/xe_vram.c
> +++ b/drivers/gpu/drm/xe/xe_vram.c
> @@ -33,9 +33,6 @@ _resize_bar(struct xe_device *xe, int resno, resource_size_t size)
> int bar_size = pci_rebar_bytes_to_size(size);
> int ret;
>
> - if (pci_resource_len(pdev, resno))
> - pci_release_resource(pdev, resno);
> -
> ret = pci_resize_resource(pdev, resno, bar_size, 0);
> if (ret) {
> drm_info(&xe->drm, "Failed to resize BAR%d to %dM (%pe). Consider enabling 'Resizable BAR' support in your BIOS\n",

This didn't apply, I assume due to a clash with:

d30203739be79 (drm/xe: Move rebar to be done earlier)

--
Alex Bennée
Virtualisation Tech Lead @ Linaro