Re: [PATCH] drm/xe/xe2hpg: Performance tuning changes

["Vivekanandan, Balasubramani" <balasubramani.vivekanandan@intel.com>]

On 13.01.2026 07:34, Matt Roper wrote:
> On Fri, Jan 09, 2026 at 10:12:51PM +0530, Balasubramani Vivekanandan wrote:
> > Further updates to performance tuning for Xe2_HPG
> > 
> > Signed-off-by: Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com>
> > ---
> >  drivers/gpu/drm/xe/regs/xe_gt_regs.h | 3 +++
> >  drivers/gpu/drm/xe/xe_tuning.c       | 5 +++++
> >  2 files changed, 8 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/xe/regs/xe_gt_regs.h b/drivers/gpu/drm/xe/regs/xe_gt_regs.h
> > index 93643da57428..cc18ddfb7cc0 100644
> > --- a/drivers/gpu/drm/xe/regs/xe_gt_regs.h
> > +++ b/drivers/gpu/drm/xe/regs/xe_gt_regs.h
> > @@ -135,6 +135,9 @@
> >  
> >  #define XEHPG_INSTDONE_GEOM_SVGUNIT		XE_REG_MCR(0x666c)
> >  
> > +#define CACHE_MODE_0				XE_REG_MCR(0x7000, XE_REG_OPTION_MASKED)
> > +#define   MSAA_FAST_CLEAR_ENABLED		REG_BIT(5)
> 
> This register is under UMD control and Mesa is already applying the
> workaround on their side.  Is there a need to do this in the kernel?

I wasn't aware UMD is already applying this workaround. Thanks for
informing. We can then drop this patch.

Regards,
Bala

> 
> 
> Matt
> 
> > +
> >  #define CACHE_MODE_1				XE_REG(0x7004, XE_REG_OPTION_MASKED)
> >  #define   MSAA_OPTIMIZATION_REDUC_DISABLE	REG_BIT(11)
> >  
> > diff --git a/drivers/gpu/drm/xe/xe_tuning.c b/drivers/gpu/drm/xe/xe_tuning.c
> > index 5766fa7742d3..122829c8d14e 100644
> > --- a/drivers/gpu/drm/xe/xe_tuning.c
> > +++ b/drivers/gpu/drm/xe/xe_tuning.c
> > @@ -144,6 +144,11 @@ static const struct xe_rtp_entry_sr lrc_tunings[] = {
> >  	  XE_RTP_ACTIONS(FIELD_SET(FF_MODE, VS_HIT_MAX_VALUE_MASK,
> >  				   REG_FIELD_PREP(VS_HIT_MAX_VALUE_MASK, 0x3f)))
> >  	},
> > +
> > +	{ XE_RTP_NAME("Tuning: MSAA fast clear"),
> > +	  XE_RTP_RULES(GRAPHICS_VERSION(2002), ENGINE_CLASS(RENDER)),
> > +	  XE_RTP_ACTIONS(SET(CACHE_MODE_0, MSAA_FAST_CLEAR_ENABLED))
> > +	},
> >  };
> >  
> >  /**
> > -- 
> > 2.43.0
> > 
> 
> -- 
> Matt Roper
> Graphics Software Engineer
> Linux GPU Platform Enablement
> Intel Corporation