[Intel-gfx] [PATCH 04/40] drm/i915: Park the GPU on module load

[Tvrtko Ursulin]

On 19/09/2018 20:55, Chris Wilson wrote:
> Once we have flushed the first request through the system to both load a
> context and record the default state; tell the GPU to park and idle
> itself, putting itself immediately (hopefully at least) into a
> powersaving state, and allowing ourselves to start from known state
> after setting up all our bookkeeping.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> ---
>   drivers/gpu/drm/i915/i915_gem.c | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index a94d5a308c4d..6b347ffb996b 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -5417,6 +5417,14 @@ static int __intel_engines_record_defaults(struct drm_i915_private *i915)
>   
>   	assert_kernel_context_is_current(i915);
>   
> +	/*
> +	 * Immediately park the GPU so that we enable powersaving and
> +	 * treat it as idle. The next time we issue a request, we will
> +	 * unpark and start using the engine->pinned_default_state, otherwise
> +	 * it is in limbo and an early reset may fail.
> +	 */
> +	__i915_gem_park(i915);
> +
>   	for_each_engine(engine, i915, id) {
>   		struct i915_vma *state;
>   		void *vaddr;
> 

Presumably the previous patch will make this pass CI?

I would prefer the parking is done from the caller level but we couldn't 
agree on this minor detail so anyway:

Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

Regards,

Tvrtko