[Intel-gfx] [PATCH 05/11] drm/i915/context: Preliminary context support

[Eric Anholt]

On Tue, 14 Feb 2012 22:09:12 +0100, Ben Widawsky <ben at bwidawsk.net> wrote:
> From: Ben Widawsky <bwidawsk at gmail.com>
> 
> Create all the necessary data structures and hooks to support a context
> API for userspace. Also plumb in the calls from the i915 core into the
> context subsystem. There is a new file i915_context.c which will hold a
> majority of the context related code. This file has nulled functions
> that get called by the proper part of the i915 driver. This of course
> requires a Makefile addition, as well as calls to the new nulled
> functions from the other partsd of the driver (i915_dma.c).
> 
> With that, there are 2 new ioctls defined , one for creating a context,
> and one for destroying a context. These are defined in the necessary
> places, and again have null functionality
> 
> It's likely that a third ioctl will be required to associate the context
> with an execbuf (likely execbuf3). Since that part is mostly trivial,
> and will surely be contentious, it's ignored for now.

> +struct drm_i915_gem_context_create {
> +	/* output: id of new context*/
> +	__u32 ctx_id;
> +
> +	__u16 pad;
> +};

The pad should be made u32 at this point instead of fixing it up in a
later commit.
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