[Intel-gfx] [PATCH 02/13] drm/i915: Copy user requested buffers into the error state

[Chris Wilson]

On Wed, Mar 29, 2017 at 04:56:24PM +0100, Chris Wilson wrote:
> Introduce a new execobject.flag (EXEC_OBJECT_CAPTURE) that userspace may
> use to indicate that it wants the contents of this buffer preserved in
> the error state (/sys/class/drm/cardN/error) following a GPU hang
> involving this batch.
> 
> Use this at your discretion, the contents of the error state. although
> compressed, are allocated with GFP_ATOMIC (i.e. limited) and kept for all
> eternity (until the error state is destroyed).
> 
> Based on an earlier patch by Ben Widawsky <ben at bwidawsk.net>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Ben Widawsky <ben at bwidawsk.net>
> Cc: Matt Turner <mattst88 at gmail.com>
> Acked-by: Ben Widawsky <ben at bwidawsk.net>
> Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

I believe Matt has userspace ready to make use of this flag and is happy
with the current ABI. Matt, are we ready to commit ourselves to this
interface?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre