linux-kernel - Re: [PATCH v3 1/4] dma-buf: add support for virtio exported objects

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Message-ID: <20200514123111.GQ206103@phenom.ffwll.local>
Date:   Thu, 14 May 2020 14:31:11 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Gerd Hoffmann <kraxel@...hat.com>
Cc:     Daniel Vetter <daniel@...ll.ch>,
        David Stevens <stevensd@...omium.org>,
        Tomasz Figa <tfiga@...omium.org>,
        David Airlie <airlied@...ux.ie>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "open list:VIRTIO CORE, NET..." 
        <virtualization@...ts.linux-foundation.org>,
        "open list:DMA BUFFER SHARING FRAMEWORK" 
        <linux-media@...r.kernel.org>,
        "moderated list:DMA BUFFER SHARING FRAMEWORK" 
        <linaro-mm-sig@...ts.linaro.org>, virtio-dev@...ts.oasis-open.org
Subject: Re: [PATCH v3 1/4] dma-buf: add support for virtio exported objects

On Thu, May 14, 2020 at 09:59:52AM +0200, Gerd Hoffmann wrote:
>   Hi,
> 
> > - for the runtime upcasting the usual approach is to check the ->ops
> > pointer. Which means that would need to be the same for all virtio
> > dma_bufs, which might get a bit awkward. But I'd really prefer we not
> > add allocator specific stuff like this to dma-buf.
> 
> This is exactly the problem, it gets messy quickly, also when it comes
> to using the drm_prime.c helpers ...

drm_prime.c helpers (not the core bits) exist becaues nvidia needed
something that wasnt EXPORT_SYMBOL_GPL.

I wouldn't shed a big tear if they don't fit anymore, they're kinda not
great to begin with. Much midlayer, not much of valued added, but at least
the _GPL is gone.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch