Re: [PATCH v2 2/2] drm/i915/gt: Cleanup interface for MCR operations

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On Fri, Jun 17, 2022 at 06:57:20AM -0700, Harish Chegondi wrote:
> On Tue, Jun 14, 2022 at 05:10:19PM -0700, Matt Roper wrote:
> > Let's replace the assortment of intel_gt_* and intel_uncore_* functions
> > that operate on MCR registers with a cleaner set of interfaces:
> > 
> >   * intel_gt_mcr_read -- unicast read from specific instance
> >   * intel_gt_mcr_read_any[_fw] -- unicast read from any non-terminated
> >     instance
> >   * intel_gt_mcr_unicast_write -- unicast write to specific instance
> >   * intel_gt_mcr_multicast_write[_fw] -- multicast write to all instances
> > 
> > We'll also replace the historic "slice" and "subslice" terminology with
> > "group" and "instance" to match the documentation for more recent
> > platforms; these days MCR steering applies to more types of replication
> > than just slice/subslice.
> > 
> > v2:
> >  - Reference the new kerneldoc from i915.rst.  (Jani)
> >  - Tweak the wording of the documentation for a couple functions to
> >    clarify the difference between "_fw" and non-"_fw" forms.
> > 
> > Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
> > Acked-by: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
> > ---
> >  Documentation/gpu/i915.rst                  |  12 +
> >  drivers/gpu/drm/i915/gem/i915_gem_stolen.c  |   2 +-
> >  drivers/gpu/drm/i915/gt/intel_engine_cs.c   |  33 ++-
> >  drivers/gpu/drm/i915/gt/intel_gt_debugfs.c  |   2 +-
> >  drivers/gpu/drm/i915/gt/intel_gt_mcr.c      | 239 ++++++++++++--------
> >  drivers/gpu/drm/i915/gt/intel_gt_mcr.h      |  43 ++--
> >  drivers/gpu/drm/i915/gt/intel_region_lmem.c |   4 +-
> >  drivers/gpu/drm/i915/gt/intel_workarounds.c |   8 +-
> >  drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c  |   2 +-
> >  9 files changed, 200 insertions(+), 145 deletions(-)
> > 
> > diff --git a/Documentation/gpu/i915.rst b/Documentation/gpu/i915.rst
> > index 54060cd6c419..4e59db1cfb00 100644
> > --- a/Documentation/gpu/i915.rst
> > +++ b/Documentation/gpu/i915.rst
> > @@ -246,6 +246,18 @@ Display State Buffer
> >  .. kernel-doc:: drivers/gpu/drm/i915/display/intel_dsb.c
> >     :internal:
> >  
> > +GT Programming
> > +==============
> > +
> > +Multicast/Replicated (MCR) Registers
> > +------------------------------------
> > +
> > +.. kernel-doc:: drivers/gpu/drm/i915/gt/intel_gt_mcr.c
> > +   :doc: GT Multicast/Replicated (MCR) Register Support
> > +
> > +.. kernel-doc:: drivers/gpu/drm/i915/gt/intel_gt_mcr.c
> > +   :internal:
> > +
> >  Memory Management and Command Submission
> >  ========================================
> >  
> > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
> > index da30503d3ca2..fa54823d1219 100644
> > --- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
> > +++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
> > @@ -835,7 +835,7 @@ i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, u16 type,
> >  	} else {
> >  		resource_size_t lmem_range;
> >  
> > -		lmem_range = intel_gt_read_register(&i915->gt0, XEHPSDV_TILE0_ADDR_RANGE) & 0xFFFF;
> > +		lmem_range = intel_gt_mcr_read_any(&i915->gt0, XEHPSDV_TILE0_ADDR_RANGE) & 0xFFFF;
> >  		lmem_size = lmem_range >> XEHPSDV_TILE_LMEM_RANGE_SHIFT;
> >  		lmem_size *= SZ_1G;
> >  	}
> > diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > index 244af1bdb7db..136cc44c3deb 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > @@ -1428,14 +1428,6 @@ void intel_engine_cancel_stop_cs(struct intel_engine_cs *engine)
> >  	ENGINE_WRITE_FW(engine, RING_MI_MODE, _MASKED_BIT_DISABLE(STOP_RING));
> >  }
> >  
> > -static u32
> > -read_subslice_reg(const struct intel_engine_cs *engine,
> > -		  int slice, int subslice, i915_reg_t reg)
> > -{
> > -	return intel_uncore_read_with_mcr_steering(engine->uncore, reg,
> > -						   slice, subslice);
> > -}
> > -
> >  /* NB: please notice the memset */
> >  void intel_engine_get_instdone(const struct intel_engine_cs *engine,
> >  			       struct intel_instdone *instdone)
> > @@ -1469,28 +1461,33 @@ void intel_engine_get_instdone(const struct intel_engine_cs *engine,
> >  		if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50)) {
> >  			for_each_instdone_gslice_dss_xehp(i915, sseu, iter, slice, subslice) {
> >  				instdone->sampler[slice][subslice] =
> > -					read_subslice_reg(engine, slice, subslice,
> > -							  GEN7_SAMPLER_INSTDONE);
> > +					intel_gt_mcr_read(engine->gt,
> > +							  GEN7_SAMPLER_INSTDONE,
> > +							  slice, subslice);
> >  				instdone->row[slice][subslice] =
> > -					read_subslice_reg(engine, slice, subslice,
> > -							  GEN7_ROW_INSTDONE);
> > +					intel_gt_mcr_read(engine->gt,
> > +							  GEN7_ROW_INSTDONE,
> > +							  slice, subslice);
> >  			}
> >  		} else {
> >  			for_each_instdone_slice_subslice(i915, sseu, slice, subslice) {
> >  				instdone->sampler[slice][subslice] =
> > -					read_subslice_reg(engine, slice, subslice,
> > -							  GEN7_SAMPLER_INSTDONE);
> > +					intel_gt_mcr_read(engine->gt,
> > +							  GEN7_SAMPLER_INSTDONE,
> > +							  slice, subslice);
> >  				instdone->row[slice][subslice] =
> > -					read_subslice_reg(engine, slice, subslice,
> > -							  GEN7_ROW_INSTDONE);
> > +					intel_gt_mcr_read(engine->gt,
> > +							  GEN7_ROW_INSTDONE,
> > +							  slice, subslice);
> >  			}
> >  		}
> >  
> >  		if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 55)) {
> >  			for_each_instdone_gslice_dss_xehp(i915, sseu, iter, slice, subslice)
> >  				instdone->geom_svg[slice][subslice] =
> > -					read_subslice_reg(engine, slice, subslice,
> > -							  XEHPG_INSTDONE_GEOM_SVG);
> > +					intel_gt_mcr_read(engine->gt,
> > +							  XEHPG_INSTDONE_GEOM_SVG,
> > +							  slice, subslice);
> >  		}
> >  	} else if (GRAPHICS_VER(i915) >= 7) {
> >  		instdone->instdone =
> > diff --git a/drivers/gpu/drm/i915/gt/intel_gt_debugfs.c b/drivers/gpu/drm/i915/gt/intel_gt_debugfs.c
> > index ea07f2bb846f..dd53641f3637 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_gt_debugfs.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_gt_debugfs.c
> > @@ -65,7 +65,7 @@ static int steering_show(struct seq_file *m, void *data)
> >  	struct drm_printer p = drm_seq_file_printer(m);
> >  	struct intel_gt *gt = m->private;
> >  
> > -	intel_gt_report_steering(&p, gt, true);
> > +	intel_gt_mcr_report_steering(&p, gt, true);
> >  
> >  	return 0;
> >  }
> > diff --git a/drivers/gpu/drm/i915/gt/intel_gt_mcr.c b/drivers/gpu/drm/i915/gt/intel_gt_mcr.c
> > index 1279a1fe1001..aa4fb308d468 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_gt_mcr.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_gt_mcr.c
> > @@ -134,23 +134,22 @@ void intel_gt_mcr_init(struct intel_gt *gt)
> >  	}
> >  }
> >  
> > -/**
> > - * uncore_rw_with_mcr_steering_fw - Access a register after programming
> > - *				    the MCR selector register.
> > +/*
> > + * rw_with_mcr_steering_fw - Access a register with specific MCR steering
> >   * @uncore: pointer to struct intel_uncore
> >   * @reg: register being accessed
> >   * @rw_flag: FW_REG_READ for read access or FW_REG_WRITE for write access
> > - * @slice: slice number (ignored for multi-cast write)
> > - * @subslice: sub-slice number (ignored for multi-cast write)
> > + * @group: group number (documented as "sliceid" on older platforms)
> > + * @instance: instance number (documented as "subsliceid" on older platforms)
> >   * @value: register value to be written (ignored for read)
> >   *
> >   * Return: 0 for write access. register value for read access.
> >   *
> >   * Caller needs to make sure the relevant forcewake wells are up.
> >   */
> > -static u32 uncore_rw_with_mcr_steering_fw(struct intel_uncore *uncore,
> > -					  i915_reg_t reg, u8 rw_flag,
> > -					  int slice, int subslice, u32 value)
> > +static u32 rw_with_mcr_steering_fw(struct intel_uncore *uncore,
> > +				   i915_reg_t reg, u8 rw_flag,
> > +				   int group, int instance, u32 value)
> >  {
> >  	u32 mcr_mask, mcr_ss, mcr, old_mcr, val = 0;
> >  
> > @@ -158,7 +157,7 @@ static u32 uncore_rw_with_mcr_steering_fw(struct intel_uncore *uncore,
> >  
> >  	if (GRAPHICS_VER(uncore->i915) >= 11) {
> >  		mcr_mask = GEN11_MCR_SLICE_MASK | GEN11_MCR_SUBSLICE_MASK;
> > -		mcr_ss = GEN11_MCR_SLICE(slice) | GEN11_MCR_SUBSLICE(subslice);
> > +		mcr_ss = GEN11_MCR_SLICE(group) | GEN11_MCR_SUBSLICE(instance);
> >  
> >  		/*
> >  		 * Wa_22013088509
> > @@ -176,7 +175,7 @@ static u32 uncore_rw_with_mcr_steering_fw(struct intel_uncore *uncore,
> >  			mcr_mask |= GEN11_MCR_MULTICAST;
> >  	} else {
> >  		mcr_mask = GEN8_MCR_SLICE_MASK | GEN8_MCR_SUBSLICE_MASK;
> > -		mcr_ss = GEN8_MCR_SLICE(slice) | GEN8_MCR_SUBSLICE(subslice);
> > +		mcr_ss = GEN8_MCR_SLICE(group) | GEN8_MCR_SUBSLICE(instance);
> >  	}
> >  
> >  	old_mcr = mcr = intel_uncore_read_fw(uncore, GEN8_MCR_SELECTOR);
> > @@ -198,10 +197,10 @@ static u32 uncore_rw_with_mcr_steering_fw(struct intel_uncore *uncore,
> >  	return val;
> >  }
> >  
> > -static u32 uncore_rw_with_mcr_steering(struct intel_uncore *uncore,
> > -				       i915_reg_t reg, u8 rw_flag,
> > -				       int slice, int subslice,
> > -				       u32 value)
> > +static u32 rw_with_mcr_steering(struct intel_uncore *uncore,
> > +				i915_reg_t reg, u8 rw_flag,
> > +				int group, int instance,
> > +				u32 value)
> >  {
> >  	enum forcewake_domains fw_domains;
> >  	u32 val;
> > @@ -215,8 +214,7 @@ static u32 uncore_rw_with_mcr_steering(struct intel_uncore *uncore,
> >  	spin_lock_irq(&uncore->lock);
> >  	intel_uncore_forcewake_get__locked(uncore, fw_domains);
> >  
> > -	val = uncore_rw_with_mcr_steering_fw(uncore, reg, rw_flag,
> > -					     slice, subslice, value);
> > +	val = rw_with_mcr_steering_fw(uncore, reg, rw_flag, group, instance, value);
> >  
> >  	intel_uncore_forcewake_put__locked(uncore, fw_domains);
> >  	spin_unlock_irq(&uncore->lock);
> > @@ -224,31 +222,73 @@ static u32 uncore_rw_with_mcr_steering(struct intel_uncore *uncore,
> >  	return val;
> >  }
> >  
> > -u32 intel_uncore_read_with_mcr_steering_fw(struct intel_uncore *uncore,
> > -					   i915_reg_t reg, int slice, int subslice)
> > +/**
> > + * intel_gt_mcr_read - read a specific instance of an MCR register
> > + * @gt: GT structure
> > + * @reg: the MCR register to read
> > + * @group: the MCR group
> > + * @instance: the MCR instance
> > + *
> > + * Returns the value read from an MCR register after steering toward a specific
> > + * group/instance.
> > + */
> > +u32 intel_gt_mcr_read(struct intel_gt *gt,
> > +		      i915_reg_t reg,
> > +		      int group, int instance)
> >  {
> > -	return uncore_rw_with_mcr_steering_fw(uncore, reg, FW_REG_READ,
> > -					      slice, subslice, 0);
> > +	return rw_with_mcr_steering(gt->uncore, reg, FW_REG_READ, group, instance, 0);
> >  }
> >  
> > -u32 intel_uncore_read_with_mcr_steering(struct intel_uncore *uncore,
> > -					i915_reg_t reg, int slice, int subslice)
> > +/**
> > + * intel_gt_mcr_unicast_write - write a specific instance of an MCR register
> > + * @gt: GT structure
> > + * @reg: the MCR register to read
> to write
> > + * @value: value to write
> > + * @group: the MCR group
> > + * @instance: the MCR instance
> > + *
> > + * Write an MCR register in unicast mode after steering toward a specific
> > + * group/instance.
> > + */
> > +void intel_gt_mcr_unicast_write(struct intel_gt *gt, i915_reg_t reg, u32 value,
> > +				int group, int instance)
> >  {
> > -	return uncore_rw_with_mcr_steering(uncore, reg, FW_REG_READ,
> > -					   slice, subslice, 0);
> > +	rw_with_mcr_steering(gt->uncore, reg, FW_REG_WRITE, group, instance, value);
> >  }
> >  
> > -void intel_uncore_write_with_mcr_steering(struct intel_uncore *uncore,
> > -					  i915_reg_t reg, u32 value,
> > -					  int slice, int subslice)
> > +/**
> > + * intel_gt_mcr_multicast_write - write a value to all instances of an MCR register
> > + * @gt: GT structure
> > + * @reg: the MCR register to read
> to write
> > + * @value: value to write
> > + *
> > + * Write an MCR register in multicast mode to update all instances.
> > + */
> > +void intel_gt_mcr_multicast_write(struct intel_gt *gt,
> > +				i915_reg_t reg, u32 value)
> >  {
> > -	uncore_rw_with_mcr_steering(uncore, reg, FW_REG_WRITE,
> > -				    slice, subslice, value);
> > +	intel_uncore_write(gt->uncore, reg, value);
> >  }
> >  
> >  /**
> > - * intel_gt_reg_needs_read_steering - determine whether a register read
> > - *     requires explicit steering
> > + * intel_gt_mcr_multicast_write_fw - write a value to all instances of an MCR register
> > + * @gt: GT structure
> > + * @reg: the MCR register to read
> to write
> > + * @value: value to write
> > + *
> > + * Write an MCR register in multicast mode to update all instances.  This
> > + * function assumes the caller is already holding any necessary forcewake
> > + * domains; use intel_gt_mcr_multicast_write() in cases where forcewake should
> > + * be obtained automatically.
> > + */
> > +void intel_gt_mcr_multicast_write_fw(struct intel_gt *gt, i915_reg_t reg, u32 value)
> > +{
> > +	intel_uncore_write_fw(gt->uncore, reg, value);
> > +}
> > +
> > +/*
> > + * reg_needs_read_steering - determine whether a register read requires
> > + *     explicit steering
> >   * @gt: GT structure
> >   * @reg: the register to check steering requirements for
> >   * @type: type of multicast steering to check
> > @@ -260,14 +300,14 @@ void intel_uncore_write_with_mcr_steering(struct intel_uncore *uncore,
> >   * steering type, or if the default (subslice-based) steering IDs are suitable
> >   * for @type steering too.
> >   */
> > -static bool intel_gt_reg_needs_read_steering(struct intel_gt *gt,
> > -					     i915_reg_t reg,
> > -					     enum intel_steering_type type)
> > +static bool reg_needs_read_steering(struct intel_gt *gt,
> > +				    i915_reg_t reg,
> > +				    enum intel_steering_type type)
> >  {
> >  	const u32 offset = i915_mmio_reg_offset(reg);
> >  	const struct intel_mmio_range *entry;
> >  
> > -	if (likely(!intel_gt_needs_read_steering(gt, type)))
> > +	if (likely(!gt->steering_table[type]))
> >  		return false;
> >  
> >  	for (entry = gt->steering_table[type]; entry->end; entry++) {
> > @@ -278,29 +318,29 @@ static bool intel_gt_reg_needs_read_steering(struct intel_gt *gt,
> >  	return false;
> >  }
> >  
> > -/**
> > - * intel_gt_get_valid_steering - determines valid IDs for a class of MCR steering
> > +/*
> > + * get_nonterminated_steering - determines valid IDs for a class of MCR steering
> >   * @gt: GT structure
> >   * @type: multicast register type
> > - * @sliceid: Slice ID returned
> > - * @subsliceid: Subslice ID returned
> > + * @group: Group ID returned
> > + * @instance: Instance ID returned
> >   *
> > - * Determines sliceid and subsliceid values that will steer reads
> > - * of a specific multicast register class to a valid value.
> > + * Determines group and instance values that will steer reads of the specified
> > + * MCR class to a non-terminated instance.
> >   */
> > -static void intel_gt_get_valid_steering(struct intel_gt *gt,
> > -					enum intel_steering_type type,
> > -					u8 *sliceid, u8 *subsliceid)
> > +static void get_nonterminated_steering(struct intel_gt *gt,
> > +				       enum intel_steering_type type,
> > +				       u8 *group, u8 *instance)
> >  {
> >  	switch (type) {
> >  	case L3BANK:
> > -		*sliceid = 0;		/* unused */
> > -		*subsliceid = __ffs(gt->info.l3bank_mask);
> > +		*group = 0;		/* unused */
> > +		*instance = __ffs(gt->info.l3bank_mask);
> >  		break;
> >  	case MSLICE:
> >  		GEM_WARN_ON(!HAS_MSLICE_STEERING(gt->i915));
> > -		*sliceid = __ffs(gt->info.mslice_mask);
> > -		*subsliceid = 0;	/* unused */
> > +		*group = __ffs(gt->info.mslice_mask);
> > +		*instance = 0;	/* unused */
> >  		break;
> >  	case LNCF:
> >  		/*
> > @@ -308,96 +348,105 @@ static void intel_gt_get_valid_steering(struct intel_gt *gt,
> >  		 * can safely just steer to LNCF 0 in all cases.
> >  		 */
> >  		GEM_WARN_ON(!HAS_MSLICE_STEERING(gt->i915));
> > -		*sliceid = __ffs(gt->info.mslice_mask) << 1;
> > -		*subsliceid = 0;	/* unused */
> > +		*group = __ffs(gt->info.mslice_mask) << 1;
> > +		*instance = 0;	/* unused */
> >  		break;
> >  	case INSTANCE0:
> >  		/*
> >  		 * There are a lot of MCR types for which instance (0, 0)
> >  		 * will always provide a non-terminated value.
> >  		 */
> > -		*sliceid = 0;
> > -		*subsliceid = 0;
> > +		*group = 0;
> > +		*instance = 0;
> >  		break;
> >  	default:
> >  		MISSING_CASE(type);
> > -		*sliceid = 0;
> > -		*subsliceid = 0;
> > +		*group = 0;
> > +		*instance = 0;
> >  	}
> >  }
> >  
> >  /**
> > - * intel_gt_get_valid_steering_for_reg - get a valid steering for a register
> > + * intel_gt_mcr_get_nonterminated_steering - find group/instance values that
> > + *    will steer a register to a non-terminated instance
> >   * @gt: GT structure
> >   * @reg: register for which the steering is required
> > - * @sliceid: return variable for slice steering
> > - * @subsliceid: return variable for subslice steering
> > + * @group: return variable for group steering
> > + * @instance: return variable for instance steering
> >   *
> > - * This function returns a slice/subslice pair that is guaranteed to work for
> > + * This function returns a group/instance pair that is guaranteed to work for
> >   * read steering of the given register. Note that a value will be returned even
> >   * if the register is not replicated and therefore does not actually require
> >   * steering.
> >   */
> > -void intel_gt_get_valid_steering_for_reg(struct intel_gt *gt, i915_reg_t reg,
> > -					 u8 *sliceid, u8 *subsliceid)
> > +void intel_gt_mcr_get_nonterminated_steering(struct intel_gt *gt,
> > +					     i915_reg_t reg,
> > +					     u8 *group, u8 *instance)
> >  {
> >  	int type;
> >  
> >  	for (type = 0; type < NUM_STEERING_TYPES; type++) {
> > -		if (intel_gt_reg_needs_read_steering(gt, reg, type)) {
> > -			intel_gt_get_valid_steering(gt, type, sliceid,
> > -						    subsliceid);
> > +		if (reg_needs_read_steering(gt, reg, type)) {
> > +			get_nonterminated_steering(gt, type, group, instance);
> >  			return;
> >  		}
> >  	}
> >  
> > -	*sliceid = gt->default_steering.groupid;
> > -	*subsliceid = gt->default_steering.instanceid;
> > +	*group = gt->default_steering.groupid;
> > +	*instance = gt->default_steering.instanceid;
> >  }
> >  
> >  /**
> > - * intel_gt_read_register_fw - reads a GT register with support for multicast
> > + * intel_gt_mcr_read_any_fw - reads one instance of an MCR register
> >   * @gt: GT structure
> >   * @reg: register to read
> >   *
> > - * This function will read a GT register.  If the register is a multicast
> > - * register, the read will be steered to a valid instance (i.e., one that
> > - * isn't fused off or powered down by power gating).
> > + * Reads a GT MCR register.  The read will be steered to a non-terminated
> > + * instance (i.e., one that isn't fused off or powered down by power gating).
> > + * This function assumes the caller is already holding any necessary forcewake
> > + * domains; use intel_gt_mcr_read_any() in cases where forcewake should be
> > + * obtained automatically.
> >   *
> > - * Returns the value from a valid instance of @reg.
> > + * Returns the value from a non-terminated instance of @reg.
> >   */
> > -u32 intel_gt_read_register_fw(struct intel_gt *gt, i915_reg_t reg)
> > +u32 intel_gt_mcr_read_any_fw(struct intel_gt *gt, i915_reg_t reg)
> >  {
> >  	int type;
> > -	u8 sliceid, subsliceid;
> > +	u8 group, instance;
> >  
> >  	for (type = 0; type < NUM_STEERING_TYPES; type++) {
> > -		if (intel_gt_reg_needs_read_steering(gt, reg, type)) {
> > -			intel_gt_get_valid_steering(gt, type, &sliceid,
> > -						    &subsliceid);
> > -			return intel_uncore_read_with_mcr_steering_fw(gt->uncore,
> > -								      reg,
> > -								      sliceid,
> > -								      subsliceid);
> > +		if (reg_needs_read_steering(gt, reg, type)) {
> > +			get_nonterminated_steering(gt, type, &group, &instance);
> > +			return rw_with_mcr_steering_fw(gt->uncore, reg,
> > +						       FW_REG_READ,
> > +						       group, instance, 0);
> >  		}
> >  	}
> >  
> >  	return intel_uncore_read_fw(gt->uncore, reg);
> >  }
> >  
> > -u32 intel_gt_read_register(struct intel_gt *gt, i915_reg_t reg)
> > +/**
> > + * intel_gt_mcr_read_any - reads one instance of an MCR register
> > + * @gt: GT structure
> > + * @reg: register to read
> > + *
> > + * Reads a GT MCR register.  The read will be steered to a non-terminated
> > + * instance (i.e., one that isn't fused off or powered down by power gating).
> > + *
> > + * Returns the value from a non-terminated instance of @reg.
> > + */
> > +u32 intel_gt_mcr_read_any(struct intel_gt *gt, i915_reg_t reg)
> >  {
> >  	int type;
> > -	u8 sliceid, subsliceid;
> > +	u8 group, instance;
> >  
> >  	for (type = 0; type < NUM_STEERING_TYPES; type++) {
> > -		if (intel_gt_reg_needs_read_steering(gt, reg, type)) {
> > -			intel_gt_get_valid_steering(gt, type, &sliceid,
> > -						    &subsliceid);
> > -			return intel_uncore_read_with_mcr_steering(gt->uncore,
> > -								   reg,
> > -								   sliceid,
> > -								   subsliceid);
> > +		if (reg_needs_read_steering(gt, reg, type)) {
> > +			get_nonterminated_steering(gt, type, &group, &instance);
> > +			return rw_with_mcr_steering(gt->uncore, reg,
> > +						    FW_REG_READ,
> > +						    group, instance, 0);
> >  		}
> >  	}
> >  
> > @@ -410,7 +459,7 @@ static void report_steering_type(struct drm_printer *p,
> >  				 bool dump_table)
> >  {
> >  	const struct intel_mmio_range *entry;
> > -	u8 slice, subslice;
> > +	u8 group, instance;
> >  
> >  	BUILD_BUG_ON(ARRAY_SIZE(intel_steering_types) != NUM_STEERING_TYPES);
> >  
> > @@ -420,9 +469,9 @@ static void report_steering_type(struct drm_printer *p,
> >  		return;
> >  	}
> >  
> > -	intel_gt_get_valid_steering(gt, type, &slice, &subslice);
> > -	drm_printf(p, "%s steering: sliceid=0x%x, subsliceid=0x%x\n",
> > -		   intel_steering_types[type], slice, subslice);
> > +	get_nonterminated_steering(gt, type, &group, &instance);
> > +	drm_printf(p, "%s steering: group=0x%x, instance=0x%x\n",
> > +		   intel_steering_types[type], group, instance);
> >  
> >  	if (!dump_table)
> >  		return;
> > @@ -431,10 +480,10 @@ static void report_steering_type(struct drm_printer *p,
> >  		drm_printf(p, "\t0x%06x - 0x%06x\n", entry->start, entry->end);
> >  }
> >  
> > -void intel_gt_report_steering(struct drm_printer *p, struct intel_gt *gt,
> > -			      bool dump_table)
> > +void intel_gt_mcr_report_steering(struct drm_printer *p, struct intel_gt *gt,
> > +				  bool dump_table)
> >  {
> > -	drm_printf(p, "Default steering: sliceid=0x%x, subsliceid=0x%x\n",
> > +	drm_printf(p, "Default steering: group=0x%x, instance=0x%x\n",
> >  		   gt->default_steering.groupid,
> >  		   gt->default_steering.instanceid);
> >  
> > diff --git a/drivers/gpu/drm/i915/gt/intel_gt_mcr.h b/drivers/gpu/drm/i915/gt/intel_gt_mcr.h
> > index b570c1571243..506b0cbc8db3 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_gt_mcr.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_gt_mcr.h
> > @@ -10,28 +10,25 @@
> >  
> >  void intel_gt_mcr_init(struct intel_gt *gt);
> >  
> > -u32 intel_uncore_read_with_mcr_steering_fw(struct intel_uncore *uncore,
> > -					   i915_reg_t reg,
> > -					   int slice, int subslice);
> > -u32 intel_uncore_read_with_mcr_steering(struct intel_uncore *uncore,
> > -					i915_reg_t reg,	int slice, int subslice);
> > -void intel_uncore_write_with_mcr_steering(struct intel_uncore *uncore,
> > -					  i915_reg_t reg, u32 value,
> > -					  int slice, int subslice);
> > -
> > -u32 intel_gt_read_register_fw(struct intel_gt *gt, i915_reg_t reg);
> > -u32 intel_gt_read_register(struct intel_gt *gt, i915_reg_t reg);
> > -
> > -static inline bool intel_gt_needs_read_steering(struct intel_gt *gt,
> > -						enum intel_steering_type type)
> > -{
> > -	return gt->steering_table[type];
> > -}
> > -
> > -void intel_gt_get_valid_steering_for_reg(struct intel_gt *gt, i915_reg_t reg,
> > -					 u8 *sliceid, u8 *subsliceid);
> > -
> > -void intel_gt_report_steering(struct drm_printer *p, struct intel_gt *gt,
> > -			      bool dump_table);
> > +u32 intel_gt_mcr_read(struct intel_gt *gt,
> > +		      i915_reg_t reg,
> > +		      int group, int instance);
> > +u32 intel_gt_mcr_read_any_fw(struct intel_gt *gt, i915_reg_t reg);
> > +u32 intel_gt_mcr_read_any(struct intel_gt *gt, i915_reg_t reg);
> > +
> > +void intel_gt_mcr_unicast_write(struct intel_gt *gt,
> > +				i915_reg_t reg, u32 value,
> > +				int group, int instance);
> > +void intel_gt_mcr_multicast_write(struct intel_gt *gt,
> > +				  i915_reg_t reg, u32 value);
> > +void intel_gt_mcr_multicast_write_fw(struct intel_gt *gt,
> > +				     i915_reg_t reg, u32 value);
> > +
> > +void intel_gt_mcr_get_nonterminated_steering(struct intel_gt *gt,
> > +					     i915_reg_t reg,
> > +					     u8 *group, u8 *instance);
> > +
> > +void intel_gt_mcr_report_steering(struct drm_printer *p, struct intel_gt *gt,
> > +				  bool dump_table);
> >  
> >  #endif /* __INTEL_GT_MCR__ */
> > diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.c b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
> > index 1f4e7237a924..2ff448047020 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_region_lmem.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
> > @@ -105,11 +105,11 @@ static struct intel_memory_region *setup_lmem(struct intel_gt *gt)
> >  		resource_size_t lmem_range;
> >  		u64 tile_stolen, flat_ccs_base;
> >  
> > -		lmem_range = intel_gt_read_register(&i915->gt0, XEHPSDV_TILE0_ADDR_RANGE) & 0xFFFF;
> > +		lmem_range = intel_gt_mcr_read_any(&i915->gt0, XEHPSDV_TILE0_ADDR_RANGE) & 0xFFFF;
> >  		lmem_size = lmem_range >> XEHPSDV_TILE_LMEM_RANGE_SHIFT;
> >  		lmem_size *= SZ_1G;
> >  
> > -		flat_ccs_base = intel_gt_read_register(gt, XEHPSDV_FLAT_CCS_BASE_ADDR);
> > +		flat_ccs_base = intel_gt_mcr_read_any(gt, XEHPSDV_FLAT_CCS_BASE_ADDR);
> >  		flat_ccs_base = (flat_ccs_base >> XEHPSDV_CCS_BASE_SHIFT) * SZ_64K;
> >  
> >  		/* FIXME: Remove this when we have small-bar enabled */
> > diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> > index 97d7f30b1229..e42fbb982bb3 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> > @@ -1083,7 +1083,7 @@ static void __add_mcr_wa(struct intel_gt *gt, struct i915_wa_list *wal,
> >  	gt->default_steering.instanceid = subslice;
> >  
> >  	if (drm_debug_enabled(DRM_UT_DRIVER))
> > -		intel_gt_report_steering(&p, gt, false);
> > +		intel_gt_mcr_report_steering(&p, gt, false);
> >  }
> >  
> >  static void
> > @@ -1624,13 +1624,13 @@ wa_list_apply(struct intel_gt *gt, const struct i915_wa_list *wal)
> >  		u32 val, old = 0;
> >  
> >  		/* open-coded rmw due to steering */
> > -		old = wa->clr ? intel_gt_read_register_fw(gt, wa->reg) : 0;
> > +		old = wa->clr ? intel_gt_mcr_read_any_fw(gt, wa->reg) : 0;
> >  		val = (old & ~wa->clr) | wa->set;
> >  		if (val != old || !wa->clr)
> >  			intel_uncore_write_fw(uncore, wa->reg, val);
> >  
> >  		if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM))
> > -			wa_verify(wa, intel_gt_read_register_fw(gt, wa->reg),
> > +			wa_verify(wa, intel_gt_mcr_read_any_fw(gt, wa->reg),
> >  				  wal->name, "application");
> >  	}
> >  
> > @@ -1661,7 +1661,7 @@ static bool wa_list_verify(struct intel_gt *gt,
> >  
> >  	for (i = 0, wa = wal->list; i < wal->count; i++, wa++)
> >  		ok &= wa_verify(wa,
> > -				intel_gt_read_register_fw(gt, wa->reg),
> > +				intel_gt_mcr_read_any_fw(gt, wa->reg),
> >  				wal->name, from);
> >  
> >  	intel_uncore_forcewake_put__locked(uncore, fw);
> > diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
> > index dea138d78111..ba7541f3ca61 100644
> > --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
> > +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
> > @@ -314,7 +314,7 @@ static long __must_check guc_mmio_reg_add(struct intel_gt *gt,
> >  	 * tracking, it is easier to just program the default steering for all
> >  	 * regs that don't need a non-default one.
> >  	 */
> > -	intel_gt_get_valid_steering_for_reg(gt, reg, &group, &inst);
> > +	intel_gt_mcr_get_nonterminated_steering(gt, reg, &group, &inst);
> >  	entry.flags |= GUC_REGSET_STEERING(group, inst);
> >  
> >  	slot = __mmio_reg_add(regset, &entry);
> With the above minor fixes to comments
> 
> Reviewed-by: Harish Chegondi <harish.chegondi@xxxxxxxxx>

Comment copy/paste errors fixed and pushed to drm-intel-gt-next.  Thanks
for the review.


Matt


> > -- 
> > 2.35.3
> > 

-- 
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation



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