[Intel-gfx] [PATCH 08/11] drm/i915/context: extend contexts to execbuffer2

Eric Anholt eric at anholt.net
Wed Feb 15 20:55:56 CET 2012

On Tue, 14 Feb 2012 22:09:15 +0100, Ben Widawsky <ben at bwidawsk.net> wrote:
> Extend the flag parameter to support the context id (from the create
> IOCTL) so that userspace can associate a context with the batchbuffer.
> Signed-off-by: Ben Widawsky <ben at bwidawsk.net>

>  /** Resets the SO write offset registers for transform feedback on gen7. */
>  #define I915_EXEC_GEN7_SOL_RESET	(1<<8)
> +#define I915_EXEC_CONTEXT_MASK		(((1<<22)-1) << 9)

Instead of stuffing a context id into a subset of flags, could we just
use a uint32_t context id in half of rsvd1?  Yeah, having over 1 << 22
contexts is crazy, but this just seems to eat up all the rest of the
flags for no reason and then we'll have to carve out of rsvd1 for the
next flag.
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