linux-kernel - Re: [PATCHv3 2/3] drm/prime: Introduce drm_gem_prime_import

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Message-ID: <20170503073945.44j65kon3f4xatll@phenom.ffwll.local>
Date:   Wed, 3 May 2017 09:39:45 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Chris Wilson <chris@...is-wilson.co.uk>,
        Laura Abbott <labbott@...hat.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Sean Paul <seanpaul@...omium.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Sumit Semwal <sumit.semwal@...aro.org>,
        intel-gfx@...ts.freedesktop.org,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
Subject: Re: [PATCHv3 2/3] drm/prime: Introduce drm_gem_prime_import_platform

On Tue, May 02, 2017 at 09:22:13PM +0100, Chris Wilson wrote:
> On Tue, May 02, 2017 at 10:02:07AM -0700, Laura Abbott wrote:
> >  /**
> > + * drm_gem_prime_import_platform - alternate implementation of the import callback
> > + * @dev: drm_device to import into
> > + * @dma_buf: dma-buf object to import
> > + *
> > + * This is identical to drm_gem_prime_import except the device used for dma_buf
> > + * attachment is an internal platform device instead of the standard device
> > + * structure. The use of this function should be limited to drivers that do not
> > + * set up an underlying device structure.
> > + */
> > +struct drm_gem_object *drm_gem_prime_import_platform(struct drm_device *dev,
> 
> Simpler soluation will be for the caller to provide the platformdev?
> 
> That works nicely for the vgem case, I think.

Yeah looking at this again, do we really need this patch? Couldn't we
instead change patch 1 to first allocate the fake platform device, then
pass that to drm_dev_alloc (instead of NULL like we do now)?

That way no resurrection of drm_device.platform_dev is needed (and I'd
really like this zombie to stay dead on 2nd thought).

Sry about this yet-another-round review :-/
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch