Re: [PATCH v2 2/4] drm/i915/gen9: Add WaDisableCtxRestoreArbitration workaround

[Daniel Vetter <daniel@ffwll.ch>]

On Mon, Jul 13, 2015 at 03:31:45PM +0300, Mika Kuoppala wrote:
> Arun Siluvery <arun.siluvery@linux.intel.com> writes:
> 
> > In Indirect and Per context w/a batch buffer,
> > +WaDisableCtxRestoreArbitration
> >
> > v2: SKL revision id was used for BXT, copy paste error found during
> > internal review (Bob Beckett).
> >
> > Cc: Robert Beckett <robert.beckett@intel.com>
> > Cc: Imre Deak <imre.deak@intel.com>
> > Signed-off-by: Arun Siluvery <arun.siluvery@linux.intel.com>
> 
> Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>

Merged first two patches of this series to dinq, thanks.
-Daniel

> 
> > ---
> >  drivers/gpu/drm/i915/intel_lrc.c | 13 +++++++++++--
> >  1 file changed, 11 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
> > index 1e88b3b..e84fc52 100644
> > --- a/drivers/gpu/drm/i915/intel_lrc.c
> > +++ b/drivers/gpu/drm/i915/intel_lrc.c
> > @@ -1274,10 +1274,13 @@ static int gen9_init_indirectctx_bb(struct intel_engine_cs *ring,
> >  				    uint32_t *const batch,
> >  				    uint32_t *offset)
> >  {
> > +	struct drm_device *dev = ring->dev;
> >  	uint32_t index = wa_ctx_start(wa_ctx, *offset, CACHELINE_DWORDS);
> >  
> > -	/* FIXME: Replace me with WA */
> > -	wa_ctx_emit(batch, MI_NOOP);
> > +	/* WaDisableCtxRestoreArbitration:skl,bxt */
> > +	if ((IS_SKYLAKE(dev) && (INTEL_REVID(dev) <= SKL_REVID_D0)) ||
> > +	    (IS_BROXTON(dev) && (INTEL_REVID(dev) == BXT_REVID_A0)))
> > +		wa_ctx_emit(batch, MI_ARB_ON_OFF | MI_ARB_DISABLE);
> >  
> >  	/* Pad to end of cacheline */
> >  	while (index % CACHELINE_DWORDS)
> > @@ -1291,8 +1294,14 @@ static int gen9_init_perctx_bb(struct intel_engine_cs *ring,
> >  			       uint32_t *const batch,
> >  			       uint32_t *offset)
> >  {
> > +	struct drm_device *dev = ring->dev;
> >  	uint32_t index = wa_ctx_start(wa_ctx, *offset, CACHELINE_DWORDS);
> >  
> > +	/* WaDisableCtxRestoreArbitration:skl,bxt */
> > +	if ((IS_SKYLAKE(dev) && (INTEL_REVID(dev) <= SKL_REVID_D0)) ||
> > +	    (IS_BROXTON(dev) && (INTEL_REVID(dev) == BXT_REVID_A0)))
> > +		wa_ctx_emit(batch, MI_ARB_ON_OFF | MI_ARB_ENABLE);
> > +
> >  	wa_ctx_emit(batch, MI_BATCH_BUFFER_END);
> >  
> >  	return wa_ctx_end(wa_ctx, *offset = index, 1);
> > -- 
> > 1.9.1
> >
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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