Re: [PATCH v2] drm/i915: Also perform gpu reset under execlist mode.

[Mika Kuoppala <mika.kuoppala@linux.intel.com>]

Chris Wilson <chris@chris-wilson.co.uk> writes:

> On Sat, Jul 04, 2015 at 12:27:34AM +0800, bing.niu@intel.com wrote:
>> From: "Niu,Bing" <bing.niu@intel.com>
>> 
>> It is found that i915 will not reset gpu under execlist mode when
>> unload module. that will lead to some issues when unload/load module
>> with different submission mode. e.g. from execlist mode to ring
>> buffer mode via loading/unloading i915. Because HW is not in a reset
>> state and registers are not clean under such condition.
>> 
>> Signed-off-by: Niu,Bing <bing.niu@intel.com>
> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
>
> I think we may end up doing the reset unconditionally in
> i915_driver_unload() because this argument holds for almost everything
> we setup. It's a bigger risk because of doing the gpu-reset on more
> machines, but module-unloading is a "developer feature"!

And after that has been sorted, we should try reset on module load.

This way initial state would be identical to after reset/unload state.
Now we have this situation that we don't know how much we are leaning on
bios on state setup.

-Mika

> The only issue is making sure that the reset is ordered appropriately.
> -Chris
>
> -- 
> Chris Wilson, Intel Open Source Technology Centre
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