[Intel-gfx] [PATCH 1/3] drm/i915: add function for GT related workarounds

[Gore, Tim]

Tim Gore 
Intel Corporation (UK) Ltd. - Co. Reg. #1134945 - Pipers Way, Swindon SN3 1RJ


> -----Original Message-----
> From: Mika Kuoppala [mailto:mika.kuoppala at linux.intel.com]
> Sent: Monday, January 25, 2016 2:39 PM
> To: Gore, Tim; intel-gfx at lists.freedesktop.org
> Cc: Gore, Tim; arun.siluvery at linux.intel.com
> Subject: Re: [PATCH 1/3] drm/i915: add function for GT related workarounds
> 
> tim.gore at intel.com writes:
> 
> > From: Tim Gore <tim.gore at intel.com>
> >
> > Add a function that is a place for workarounds that are GT related but
> > not required per ring. This function is called on driver load and also
> > after a reset and on resume, so it is safe for workarounds that get
> > clobbered in these situations.
> >
> > Signed-off-by: Tim Gore <tim.gore at intel.com>
> > ---
> >  drivers/gpu/drm/i915/i915_gem_gtt.c | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c
> > b/drivers/gpu/drm/i915/i915_gem_gtt.c
> > index 7377b67..fe960d5 100644
> > --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> > +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> > @@ -2132,6 +2132,16 @@ static void i915_address_space_init(struct
> i915_address_space *vm,
> >  	list_add_tail(&vm->global_link, &dev_priv->vm_list);  }
> >
> > +void gtt_write_workarounds(struct drm_device *dev) {
> 
> static void
> 
> This can be squashed with 2/3.
> 
> -Mika
> 
Do you mean all squashed together, into a single patch?

  Tim

> > +	struct drm_i915_private *dev_priv = dev->dev_private;
> > +
> > +	/* This function is for gtt related workarounds. This function is
> > +	 * called on driver load and after a GPU reset, so you can place
> > +	 * workarounds here even if they get overwritten by GPU reset.
> > +	 */
> > +}
> > +
> >  int i915_ppgtt_init(struct drm_device *dev, struct i915_hw_ppgtt
> > *ppgtt)  {
> >  	struct drm_i915_private *dev_priv = dev->dev_private; @@ -2148,6
> > +2158,8 @@ int i915_ppgtt_init(struct drm_device *dev, struct
> > i915_hw_ppgtt *ppgtt)
> >
> >  int i915_ppgtt_init_hw(struct drm_device *dev)  {
> > +	gtt_write_workarounds(dev);
> > +
> >  	/* In the case of execlists, PPGTT is enabled by the context
> descriptor
> >  	 * and the PDPs are contained within the context itself.  We don't
> >  	 * need to do anything here. */
> > --
> > 1.9.1