linux-kernel - Re: [PATCH 4/9] drm/vc4: Add an API for creating GPU shaders in GEM BOs.

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Date:	Wed, 02 Dec 2015 11:24:38 -0800
From:	Eric Anholt <eric@...olt.net>
To:	Emil Velikov <emil.l.velikov@...il.com>
Cc:	ML dri-devel <dri-devel@...ts.freedesktop.org>,
	"Linux-Kernel\@Vger. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/9] drm/vc4: Add an API for creating GPU shaders in GEM BOs.

Emil Velikov <emil.l.velikov@...il.com> writes:

> Hi Eric,
>
> On 1 December 2015 at 20:35, Eric Anholt <eric@...olt.net> wrote:
>> Since we have no MMU, the kernel needs to validate that the submitted
>> shader code won't make any accesses to memory that the user doesn't
>> control, which involves banning some operations (general purpose DMA
>> writes), and tracking where we need to write out pointers for other
>> operations (texture sampling).  Once it's validated, we return a GEM
>> BO containing the shader, which doesn't allow mapping for write or
>> exporting to other subsystems.
>>
>> Signed-off-by: Eric Anholt <eric@...olt.net>
>> ---
>>  drivers/gpu/drm/vc4/Makefile               |   3 +-
>>  drivers/gpu/drm/vc4/vc4_bo.c               | 140 ++++++++
>>  drivers/gpu/drm/vc4/vc4_drv.c              |   9 +-
>>  drivers/gpu/drm/vc4/vc4_drv.h              |  50 +++
>>  drivers/gpu/drm/vc4/vc4_qpu_defines.h      | 264 +++++++++++++++
>
> May I suggest that one 'exports' the header to something like
> libdrm_vc4 ? There are patches in flight for nouveau which in similar
> fashion, allow userspare to reuse existing api/abi.

I'll be putting this header in libdrm for use by Mesa and vc4-gpu-tools.
It will still have to live in the kernel as well, though.

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