[Intel-gfx] [PATCH 1/6] drm/i915: Reinitialize default context after reset

[Daniel Vetter]

On Thu, Sep 18, 2014 at 04:36:47PM +0100, Chris Wilson wrote:
> On Thu, Sep 18, 2014 at 05:58:30PM +0300, Mika Kuoppala wrote:
> > We don't know in what shape the default context was before reset.
> > The reset also dropped our changes that were done in
> > ring->init_context.
> > 
> > Mark our default context as uninitialized for it to be properly
> > setup up on reset recovery .
> 
> The fundamental problem here is that context_init is not correctly split
> into init/init_hw (or init/enable) pairs. That is we simply do not
> attempt to reset the default state after reset via i915_gem_init_hw(). I
> would rather we brought rationality to the gem init/init_hw sequence
> first.

Yeah I agree with Chris that context setup doesn't follow our established
split with _init doing the software setup (and doesn't touch the hw at
all) and _init_hw doing the hw setup. _init is run at driver load, while
_init_hw is run at driver load, resume, after gpu reset and maybe even
from runtime pm code.

But I don't mind if we do this after or before this series, whatever is
less fuzz is fine with me.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch