Re: [PATCH 4/5] drm/i915: Move sseu helper functions to intel_sseu.h

["Summers, Stuart" <stuart.summers@intel.com>]

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On Tue, 2019-04-30 at 12:02 +0300, Jani Nikula wrote:
> On Mon, 29 Apr 2019, Stuart Summers <stuart.summers@intel.com> wrote:
> > Signed-off-by: Stuart Summers <stuart.summers@intel.com>
> > ---
> >  drivers/gpu/drm/i915/gt/intel_sseu.h     | 47
> > ++++++++++++++++++++++++
> >  drivers/gpu/drm/i915/intel_device_info.h | 47 --------------------
> > ----
> >  2 files changed, 47 insertions(+), 47 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/gt/intel_sseu.h
> > b/drivers/gpu/drm/i915/gt/intel_sseu.h
> > index f5ff6b7a756a..5127b4ff92bf 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_sseu.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_sseu.h
> > @@ -63,12 +63,59 @@ intel_sseu_from_device_info(const struct
> > sseu_dev_info *sseu)
> >  	return value;
> >  }
> >  
> > +static inline unsigned int sseu_subslice_total(const struct
> > sseu_dev_info *sseu)
> > +{
> > +	unsigned int i, total = 0;
> > +
> > +	for (i = 0; i < ARRAY_SIZE(sseu->subslice_mask); i++)
> > +		total += hweight8(sseu->subslice_mask[i]);
> > +
> > +	return total;
> > +}
> > +
> >  static inline unsigned int
> >  sseu_subslices_per_slice(const struct sseu_dev_info *sseu, u8
> > slice)
> >  {
> >  	return hweight8(sseu->subslice_mask[slice]);
> >  }
> >  
> > +static inline int sseu_eu_idx(const struct sseu_dev_info *sseu,
> > +			      int slice, int subslice)
> > +{
> > +	int subslice_stride = DIV_ROUND_UP(sseu->max_eus_per_subslice,
> > +					   BITS_PER_BYTE);
> > +	int slice_stride = sseu->max_subslices * subslice_stride;
> > +
> > +	return slice * slice_stride + subslice * subslice_stride;
> > +}
> > +
> > +static inline u16 sseu_get_eus(const struct sseu_dev_info *sseu,
> > +			       int slice, int subslice)
> > +{
> > +	int i, offset = sseu_eu_idx(sseu, slice, subslice);
> > +	u16 eu_mask = 0;
> > +
> > +	for (i = 0;
> > +	     i < DIV_ROUND_UP(sseu->max_eus_per_subslice,
> > BITS_PER_BYTE); i++) {
> > +		eu_mask |= ((u16) sseu->eu_mask[offset + i]) <<
> > +			(i * BITS_PER_BYTE);
> > +	}
> > +
> > +	return eu_mask;
> > +}
> > +
> > +static inline void sseu_set_eus(struct sseu_dev_info *sseu,
> > +				int slice, int subslice, u16 eu_mask)
> > +{
> > +	int i, offset = sseu_eu_idx(sseu, slice, subslice);
> > +
> > +	for (i = 0;
> > +	     i < DIV_ROUND_UP(sseu->max_eus_per_subslice,
> > BITS_PER_BYTE); i++) {an't be 
> > +		sseu->eu_mask[offset + i] =
> > +			(eu_mask >> (BITS_PER_BYTE * i)) & 0xff;
> > +	}
> > +}
> > +
> 
> I'd appreciate follow-up to rename these functions
> intel_sseu_*. Functions in intel_foo.[ch] should be named
> intel_foo_*().

Makes sense.

> 
> Also, I'm starting to wonder the benefits of the plethora of inline
> functions we use. Should we move them to the .c file? It can't be a
> perf
> thing can it?

These are mostly called at driver load time, so no, shouldn't be a
performance issue. I don't have a preference either way, so no problem
moving these as suggested.

Thanks,
Stuart

> 
> BR,
> Jani.
> 
> >  u32 intel_sseu_make_rpcs(struct drm_i915_private *i915,
> >  			 const struct intel_sseu *req_sseu);
> >  
> > diff --git a/drivers/gpu/drm/i915/intel_device_info.h
> > b/drivers/gpu/drm/i915/intel_device_info.h
> > index 5a2e17d6146b..6412a9c72898 100644
> > --- a/drivers/gpu/drm/i915/intel_device_info.h
> > +++ b/drivers/gpu/drm/i915/intel_device_info.h
> > @@ -218,53 +218,6 @@ struct intel_driver_caps {
> >  	bool has_logical_contexts:1;
> >  };
> >  
> > -static inline unsigned int sseu_subslice_total(const struct
> > sseu_dev_info *sseu)
> > -{
> > -	unsigned int i, total = 0;
> > -
> > -	for (i = 0; i < ARRAY_SIZE(sseu->subslice_mask); i++)
> > -		total += hweight8(sseu->subslice_mask[i]);
> > -
> > -	return total;
> > -}
> > -
> > -static inline int sseu_eu_idx(const struct sseu_dev_info *sseu,
> > -			      int slice, int subslice)
> > -{
> > -	int subslice_stride = DIV_ROUND_UP(sseu->max_eus_per_subslice,
> > -					   BITS_PER_BYTE);
> > -	int slice_stride = sseu->max_subslices * subslice_stride;
> > -
> > -	return slice * slice_stride + subslice * subslice_stride;
> > -}
> > -
> > -static inline u16 sseu_get_eus(const struct sseu_dev_info *sseu,
> > -			       int slice, int subslice)
> > -{
> > -	int i, offset = sseu_eu_idx(sseu, slice, subslice);
> > -	u16 eu_mask = 0;
> > -
> > -	for (i = 0;
> > -	     i < DIV_ROUND_UP(sseu->max_eus_per_subslice,
> > BITS_PER_BYTE); i++) {
> > -		eu_mask |= ((u16) sseu->eu_mask[offset + i]) <<
> > -			(i * BITS_PER_BYTE);
> > -	}
> > -
> > -	return eu_mask;
> > -}
> > -
> > -static inline void sseu_set_eus(struct sseu_dev_info *sseu,
> > -				int slice, int subslice, u16 eu_mask)
> > -{
> > -	int i, offset = sseu_eu_idx(sseu, slice, subslice);
> > -
> > -	for (i = 0;
> > -	     i < DIV_ROUND_UP(sseu->max_eus_per_subslice,
> > BITS_PER_BYTE); i++) {
> > -		sseu->eu_mask[offset + i] =
> > -			(eu_mask >> (BITS_PER_BYTE * i)) & 0xff;
> > -	}
> > -}
> > -
> >  const char *intel_platform_name(enum intel_platform platform);
> >  
> >  void intel_device_info_subplatform_init(struct drm_i915_private
> > *dev_priv);
> 
> 

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