Re: [PATCH 00/15] drm: Move struct drm_device.pdev to legacy

From: Sam Ravnborg <sam@ravnborg.org>
To: Thomas Zimmermann <tzimmermann@suse.de>
Cc: airlied@linux.ie, nouveau@lists.freedesktop.org,
	intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	virtualization@lists.linux-foundation.org,
	amd-gfx@lists.freedesktop.org, spice-devel@lists.freedesktop.org,
	intel-gvt-dev@lists.freedesktop.org
Subject: Re: [PATCH 00/15] drm: Move struct drm_device.pdev to legacy
Date: Tue, 24 Nov 2020 22:49:41 +0100	[thread overview]
Message-ID: <20201124214941.GD93095@ravnborg.org> (raw)
In-Reply-To: <20201124113824.19994-1-tzimmermann@suse.de>

Hi Thomas.

Nice clean-up series - quite an effort to move one member to deprecated!

I have read through most of the patches. I left a few notes in my
replies but nothing buggy. Just nitpicks.

On Tue, Nov 24, 2020 at 12:38:09PM +0100, Thomas Zimmermann wrote:
> The pdev field in struct drm_device points to a PCI device structure and
> goes back to UMS-only days when all DRM drivers where for PCI devices.
> Meanwhile we also support USB, SPI and platform devices. Each of those
> uses the generic device stored in struct drm_device.dev.
> 
> To reduce duplications and remove the special case of PCI, this patchset
> converts all modesetting drivers from pdev to dev and makes pdev a field
> for legacy UMS drivers.
> 
> For PCI devices, the pointer in struct drm_device.dev can be upcasted to
> struct pci_device; or tested for PCI with dev_is_pci(). In several places
> the code can use the dev field directly.
> 
> After converting all drivers and the DRM core, the pdev fields becomes
> only relevant for legacy drivers. In a later patchset, we may want to
> convert these as well and remove pdev entirely.
> 
> The patchset touches many files, but the individual changes are mostly
> trivial. I suggest to merge each driver's patch through the respective
> tree and later the rest through drm-misc-next.
> 
> Thomas Zimmermann (15):
>   drm/amdgpu: Remove references to struct drm_device.pdev
>   drm/ast: Remove references to struct drm_device.pdev
>   drm/bochs: Remove references to struct drm_device.pdev
>   drm/cirrus: Remove references to struct drm_device.pdev
>   drm/gma500: Remove references to struct drm_device.pdev
>   drm/hibmc: Remove references to struct drm_device.pdev
>   drm/mgag200: Remove references to struct drm_device.pdev
>   drm/qxl: Remove references to struct drm_device.pdev
>   drm/vboxvideo: Remove references to struct drm_device.pdev
>   drm/virtgpu: Remove references to struct drm_device.pdev
>   drm/vmwgfx: Remove references to struct drm_device.pdev
>   drm: Upcast struct drm_device.dev to struct pci_device; replace pdev
All above are:
Acked-by: Sam Ravnborg <sam@ravnborg.org>

>   drm/nouveau: Remove references to struct drm_device.pdev
I lost my confidence in my reading of this code.

>   drm/i915: Remove references to struct drm_device.pdev
>   drm/radeon: Remove references to struct drm_device.pdev
I did not look at these at all. I hope someone else find time to do so.

	Sam
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