Re: [PATCH 3/4] drm/i915: set optimum eu/slice/sub-slice configuration based on load type

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Hi Tvrtko, 
Your review changes are incorporated in v2. 
Regards, Ankit
> -----Original Message-----
> From: Tvrtko Ursulin [mailto:tvrtko.ursulin@xxxxxxxxxxxxxxx]
> Sent: Friday, September 21, 2018 6:36 PM
> To: J Karanje, Kedar <kedar.j.karanje@xxxxxxxxx>; intel-
> gfx@xxxxxxxxxxxxxxxxxxxxx
> Cc: Diwakar, Praveen <praveen.diwakar@xxxxxxxxx>; Marathe, Yogesh
> <yogesh.marathe@xxxxxxxxx>; Navik, Ankit P <ankit.p.navik@xxxxxxxxx>;
> Muthukumar, Aravindan <aravindan.muthukumar@xxxxxxxxx>
> Subject: Re:  [PATCH 3/4] drm/i915: set optimum eu/slice/sub-slice
> configuration based on load type
> 
> 
> On 21/09/2018 10:13, kedar.j.karanje@xxxxxxxxx wrote:
> > From: Praveen Diwakar <praveen.diwakar@xxxxxxxxx>
> >
> > This patch will select optimum eu/slice/sub-slice configuration based
> > on type of load (low, medium, high) as input.
> > Based on our readings and experiments we have predefined set of
> > optimum configuration for each platform(CHT, KBL).
> > i915_set_optimum_config will select optimum configuration from
> > pre-defined optimum configuration table(opt_config).
> >
> > Change-Id: I3a6a2a6bdddd01b3d3c97995f5403aef3c6fa989
> > Signed-off-by: Praveen Diwakar <praveen.diwakar@xxxxxxxxx>
> > Signed-off-by: Yogesh Marathe <yogesh.marathe@xxxxxxxxx>
> > Signed-off-by: Aravindan Muthukumar <aravindan.muthukumar@xxxxxxxxx>
> > Signed-off-by: Kedar J Karanje <kedar.j.karanje@xxxxxxxxx>
> > Signed-off-by: Ankit Navik <ankit.p.navik@xxxxxxxxx>
> > ---
> >   drivers/gpu/drm/i915/i915_gem_context.c | 46
> +++++++++++++++++++++++++++++++++
> >   drivers/gpu/drm/i915/i915_gem_context.h | 32 +++++++++++++++++++++++
> >   2 files changed, 78 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_gem_context.c
> > b/drivers/gpu/drm/i915/i915_gem_context.c
> > index 2838c1d..1b76410 100644
> > --- a/drivers/gpu/drm/i915/i915_gem_context.c
> > +++ b/drivers/gpu/drm/i915/i915_gem_context.c
> > @@ -94,6 +94,32 @@
> >
> >   #define ALL_L3_SLICES(dev) (1 << NUM_L3_SLICES(dev)) - 1
> >
> > +static struct optimum_config
> opt_config[TIER_VERSION_MAX][LOAD_TYPE_MAX] = {
> > +	{
> > +		/* Cherry trail low */
> > +		{ 1, 1, 4},
> > +		/* Cherry trail medium */
> > +		{ 1, 1, 6},
> > +		/* Cherry trail high */
> > +		{ 1, 2, 6}
> > +	},
> > +	{
> > +		/* kbl gt2 low */
> > +		{ 2, 3, 4},
> > +		/* kbl gt2 medium */
> > +		{ 2, 3, 6},
> > +		/* kbl gt2 high */
> > +		{ 2, 3, 8}
> > +	},
> > +	{
> > +		/* kbl gt3 low */
> > +		{ 2, 3, 4},
> > +		/* kbl gt3 medium */
> > +		{ 2, 3, 6},
> > +		/* kbl gt3 high */
> > +		{ 2, 3, 8}
> > +	}
> > +};
> >   static void lut_close(struct i915_gem_context *ctx)
> >   {
> >   	struct i915_lut_handle *lut, *ln;
> > @@ -393,10 +419,30 @@ i915_gem_create_context(struct drm_i915_private
> *dev_priv,
> >   	ctx->subslice_cnt = hweight8(
> >   			INTEL_INFO(dev_priv)->sseu.subslice_mask[0]);
> >   	ctx->eu_cnt = INTEL_INFO(dev_priv)->sseu.eu_per_subslice;
> > +	ctx->load_type = 0;
> > +	ctx->prev_load_type = 0;
> >
> >   	return ctx;
> >   }
> >
> > +
> > +void i915_set_optimum_config(int type, struct i915_gem_context *ctx,
> 
> Type for type should be enum.
> 
> Name the function as i915_gem_context_set_load_type(ctx, type).
> 
> > +		enum gem_tier_versions version)
> > +{
> > +	struct intel_context *ce = &ctx->__engine[RCS];
> > +	u32 *reg_state = ce->lrc_reg_state;
> > +	u32 rpcs_config = 0;
> 
> Unused locals?
> 
> > +	/* Call opt_config to get correct configuration for eu,slice,subslice */
> > +	ctx->slice_cnt = (u8)opt_config[version][type].slice;
> > +	ctx->subslice_cnt = (u8)opt_config[version][type].subslice;
> > +	ctx->eu_cnt = (u8)opt_config[version][type].eu;
> 
> You could store the correct table for the device in dev_priv and use the static
> table to assign/populate on device init time.
> 
> > +
> > +	/* Enabling this to update the rpcs */
> > +	if (ctx->prev_load_type != type)
> > +		ctx->update_render_config = 1;
> 
> ctx->update_render_config was unused in last patch. So patch ordering is
> a bit suboptimal but I don't know.
> 
> > +
> > +	ctx->prev_load_type = type;
> > +}
> >   /**
> >    * i915_gem_context_create_gvt - create a GVT GEM context
> >    * @dev: drm device *
> > diff --git a/drivers/gpu/drm/i915/i915_gem_context.h
> b/drivers/gpu/drm/i915/i915_gem_context.h
> > index 52e341c..50183e6 100644
> > --- a/drivers/gpu/drm/i915/i915_gem_context.h
> > +++ b/drivers/gpu/drm/i915/i915_gem_context.h
> > @@ -53,6 +53,26 @@ struct intel_context_ops {
> >   	void (*destroy)(struct intel_context *ce);
> >   };
> >
> > +enum gem_load_type {
> > +	LOAD_TYPE_LOW,
> > +	LOAD_TYPE_MEDIUM,
> > +	LOAD_TYPE_HIGH,
> > +	LOAD_TYPE_MAX
> > +};
> > +
> > +enum gem_tier_versions {
> > +	CHERRYVIEW = 0,
> > +	KABYLAKE_GT2,
> > +	KABYLAKE_GT3,
> > +	TIER_VERSION_MAX
> > +};
> > +
> > +struct optimum_config {
> > +	int slice;
> > +	int subslice;
> > +	int eu;
> 
> u8 would do global table definitely.
> 
> > +};
> > +
> >   /**
> >    * struct i915_gem_context - client state
> >    *
> > @@ -210,6 +230,16 @@ struct i915_gem_context {
> >   	/** eu_cnt: used to set the # of eu to be enabled. */
> >   	u8 eu_cnt;
> >
> > +	/** load_type: The designated load_type (high/medium/low) for a given
> > +	 * number of pending commands in the command queue.
> > +	 */
> > +	u8 load_type;
> 
> Unused?
> 
> > +
> > +	/** prev_load_type: The earlier load type that the GPU was configured
> > +	 * for (high/medium/low).
> > +	 */
> > +	u8 prev_load_type;
> 
> Would pending_load_type sound more obvious?
> 
> Types should be enums for both.
> 
> Regards,
> 
> Tvrtko
> 
> > +
> >   	/** update_render_config: to track the updates to the render
> >   	 * configuration (S/SS/EU Configuration on the GPU)
> >   	 */
> > @@ -342,6 +372,8 @@ int i915_gem_context_setparam_ioctl(struct
> drm_device *dev, void *data,
> >   				    struct drm_file *file_priv);
> >   int i915_gem_context_reset_stats_ioctl(struct drm_device *dev, void *data,
> >   				       struct drm_file *file);
> > +void i915_set_optimum_config(int type, struct i915_gem_context *ctx,
> > +			     enum gem_tier_versions version);
> >
> >   struct i915_gem_context *
> >   i915_gem_context_create_kernel(struct drm_i915_private *i915, int prio);
> >
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