Re: [PATCH 6/6] drm/i915: Expand subslice mask

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On Wed, 2019-05-01 at 15:04 -0700, Daniele Ceraolo Spurio wrote:
> 
> On 5/1/19 8:34 AM, Stuart Summers wrote:
> > Currently, the subslice_mask runtime parameter is stored as an
> > array of subslices per slice. Expand the subslice mask array to
> > better match what is presented to userspace through the
> > I915_QUERY_TOPOLOGY_INFO ioctl. The index into this array is
> > then calculated:
> >    slice * subslice stride + subslice index / 8
> > 
> > v2: fix spacing in set_sseu_info args
> >      use set_sseu_info to initialize sseu data when building
> >      device status in debugfs
> >      rename variables in intel_engine_types.h to avoid checkpatch
> >      warnings
> > v3: update headers in intel_sseu.h
> > v4: add const to some sseu_dev_info variables
> >      use sseu->eu_stride for EU stride calculations
> > 
> > Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
> > Signed-off-by: Stuart Summers <stuart.summers@xxxxxxxxx>
> 
> Can you also get an ack from Lionel, to make sure this all fits with
> the 
> expected reporting?

Cc: Lionel Landwerlin <lionel.g.landwerlin@xxxxxxxxx>

> 
> > ---
> >   drivers/gpu/drm/i915/gt/intel_engine_cs.c    |   6 +-
> >   drivers/gpu/drm/i915/gt/intel_engine_types.h |  32 +++--
> >   drivers/gpu/drm/i915/gt/intel_hangcheck.c    |   3 +-
> >   drivers/gpu/drm/i915/gt/intel_sseu.c         |  49 +++++--
> >   drivers/gpu/drm/i915/gt/intel_sseu.h         |  16 ++-
> >   drivers/gpu/drm/i915/gt/intel_workarounds.c  |   2 +-
> >   drivers/gpu/drm/i915/i915_debugfs.c          |  44 +++---
> >   drivers/gpu/drm/i915/i915_drv.c              |   6 +-
> >   drivers/gpu/drm/i915/i915_gpu_error.c        |   5 +-
> >   drivers/gpu/drm/i915/i915_query.c            |  10 +-
> >   drivers/gpu/drm/i915/intel_device_info.c     | 142 +++++++++++---
> > -----
> >   11 files changed, 198 insertions(+), 117 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > index 6e40f8ea9a6a..8f7967cc9a50 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > @@ -914,7 +914,7 @@ u32 intel_calculate_mcr_s_ss_select(struct
> > drm_i915_private *dev_priv)
> >   	const struct sseu_dev_info *sseu = &RUNTIME_INFO(dev_priv)-
> > >sseu;
> >   	u32 mcr_s_ss_select;
> >   	u32 slice = fls(sseu->slice_mask);
> > -	u32 subslice = fls(sseu->subslice_mask[slice]);
> > +	u32 subslice = fls(sseu->subslice_mask[slice * sseu-
> > >ss_stride]);
> 
> This (and the registers we use below) only works if ss_stride = 1.
> Can 
> we add a:
> 
> 	GEM_BUG_ON(sseu->ss_stride > 1);
> 
> to catch the fact that this function will need updating to handle
> that 
> case if/when we get it?

I'll rework this and post an update.

> 
> >   
> >   	if (IS_GEN(dev_priv, 10))
> >   		mcr_s_ss_select = GEN8_MCR_SLICE(slice) |
> > @@ -990,6 +990,7 @@ void intel_engine_get_instdone(struct
> > intel_engine_cs *engine,
> >   			       struct intel_instdone *instdone)
> >   {
> >   	struct drm_i915_private *dev_priv = engine->i915;
> > +	const struct sseu_dev_info *sseu = &RUNTIME_INFO(dev_priv)-
> > >sseu;
> >   	struct intel_uncore *uncore = engine->uncore;
> >   	u32 mmio_base = engine->mmio_base;
> >   	int slice;
> > @@ -1007,7 +1008,8 @@ void intel_engine_get_instdone(struct
> > intel_engine_cs *engine,
> >   
> >   		instdone->slice_common =
> >   			intel_uncore_read(uncore, GEN7_SC_INSTDONE);
> > -		for_each_instdone_slice_subslice(dev_priv, slice,
> > subslice) {
> > +		for_each_instdone_slice_subslice(dev_priv, sseu, slice,
> > +						 subslice) {
> >   			instdone->sampler[slice][subslice] =
> >   				read_subslice_reg(dev_priv, slice,
> > subslice,
> >   						  GEN7_SAMPLER_INSTDONE
> > );
> > diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h
> > b/drivers/gpu/drm/i915/gt/intel_engine_types.h
> > index 9d64e33f8427..1710546a2446 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
> > @@ -534,20 +534,22 @@ intel_engine_needs_breadcrumb_tasklet(const
> > struct intel_engine_cs *engine)
> >   	return engine->flags & I915_ENGINE_NEEDS_BREADCRUMB_TASKLET;
> >   }
> >   
> > -#define instdone_slice_mask(dev_priv__) \
> > -	(IS_GEN(dev_priv__, 7) ? \
> > -	 1 : RUNTIME_INFO(dev_priv__)->sseu.slice_mask)
> > -
> > -#define instdone_subslice_mask(dev_priv__) \
> > -	(IS_GEN(dev_priv__, 7) ? \
> > -	 1 : RUNTIME_INFO(dev_priv__)->sseu.subslice_mask[0])
> > -
> > -#define for_each_instdone_slice_subslice(dev_priv__, slice__,
> > subslice__) \
> > -	for ((slice__) = 0, (subslice__) = 0; \
> > -	     (slice__) < I915_MAX_SLICES; \
> > -	     (subslice__) = ((subslice__) + 1) < I915_MAX_SUBSLICES ?
> > (subslice__) + 1 : 0, \
> > -	       (slice__) += ((subslice__) == 0)) \
> > -		for_each_if((BIT(slice__) &
> > instdone_slice_mask(dev_priv__)) && \
> > -			    (BIT(subslice__) &
> > instdone_subslice_mask(dev_priv__)))
> > +#define instdone_has_slice(dev_priv___, sseu___, slice___) \
> > +	((IS_GEN(dev_priv___, 7) ? \
> > +	  1 : (sseu___)->slice_mask) & \
> 
> I'd put the ternary op on the same line here for readability

Yeah good point.

> 
> > +	BIT(slice___)) \
> 
> no need for "\" here (and below).

Ok.

> 
> > +
> > +#define instdone_has_subslice(dev_priv__, sseu__, slice__,
> > subslice__) \
> 
> need some more parenthesis in this macro to fix the
> MACRO_ARG_PRECEDENCE 
> warning in checkpatch.

Thanks, I'll fix this.

> 
> > +	((IS_GEN(dev_priv__, 7) ? \
> > +	  1 : (sseu__)->subslice_mask[slice__ * (sseu__)->ss_stride + \
> > +				      subslice__ / BITS_PER_BYTE]) & \
> 
> The calculation to get the correct subslice u8 entry:
> 
> 	sseu->subslice_mask[s * sseu->ss_stride + ss / BITS_PER_BYTE]
> 
> seems to be repeated a few times in this patch, so it might be worth 
> moving it to its own inline function. looks like you always
> ultimately 
> want a bool, so we could also go a bit further and have something
> like:
> 
> static inline bool intel_sseu_has_subslice(sseu, s, ss)
> {
> 	u8 mask = sseu->subslice_mask[s * sseu->ss_stride +
> 				      ss / BITS_PER_BYTE];
> 
> 	return mask & BIT(ss % BITS_PER_BYTE);
> }
> 
> and then do:
> 
> #define instdone_has_subslice(dev_priv__, sseu__, slice__,
> subslice__) \
> 	((IS_GEN(dev_priv__, 7) ? subslice__ == 0 : \
> 		intel_sseu_has_subslice(...))
> 

Good point and good suggeMakes sense. stion. I'll clean this up.

> > +	 BIT(subslice__ % BITS_PER_BYTE)) \
> > +
> > +#define for_each_instdone_slice_subslice(dev_priv_, sseu_, slice_,
> > subslice_) \
> > +	for ((slice_) = 0, (subslice_) = 0; (slice_) < I915_MAX_SLICES;
> > \
> > +	     (subslice_) = ((subslice_) + 1) < I915_MAX_SUBSLICES ?
> > (subslice_) + 1 : 0, \
> 
> This ternary op should be simplifiable as:
> 
> 	(subslice_) = ((subslice_) + 1) % I915_MAX_SUBSLICES,

I had been carrying this forward as-is as much as possible. Your
suggestion makes sense though. I'll take a look.

> 
> > +	       (slice_) += ((subslice_) == 0)) \
> > +		for_each_if(instdone_has_slice(dev_priv_, sseu_, slice)
> > && \
> 
> missing the "_" after "slice"

Good catch, thanks!

> 
> > +			    instdone_has_subslice(dev_priv_, sseu_,
> > slice_, subslice_)) \
> >   
> >   #endif /* __INTEL_ENGINE_TYPES_H__ */
> > diff --git a/drivers/gpu/drm/i915/gt/intel_hangcheck.c
> > b/drivers/gpu/drm/i915/gt/intel_hangcheck.c
> > index e5eaa06fe74d..53c1c98161e1 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_hangcheck.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_hangcheck.c
> > @@ -50,6 +50,7 @@ static bool instdone_unchanged(u32
> > current_instdone, u32 *old_instdone)
> >   static bool subunits_stuck(struct intel_engine_cs *engine)
> >   {
> >   	struct drm_i915_private *dev_priv = engine->i915;
> > +	const struct sseu_dev_info *sseu = &RUNTIME_INFO(dev_priv)-
> > >sseu;
> >   	struct intel_instdone instdone;
> >   	struct intel_instdone *accu_instdone = &engine-
> > >hangcheck.instdone;
> >   	bool stuck;
> > @@ -71,7 +72,7 @@ static bool subunits_stuck(struct intel_engine_cs
> > *engine)
> >   	stuck &= instdone_unchanged(instdone.slice_common,
> >   				    &accu_instdone->slice_common);
> >   
> > -	for_each_instdone_slice_subslice(dev_priv, slice, subslice) {
> > +	for_each_instdone_slice_subslice(dev_priv, sseu, slice,
> > subslice) {
> >   		stuck &=
> > instdone_unchanged(instdone.sampler[slice][subslice],
> >   					    &accu_instdone-
> > >sampler[slice][subslice]);
> >   		stuck &=
> > instdone_unchanged(instdone.row[slice][subslice],
> > diff --git a/drivers/gpu/drm/i915/gt/intel_sseu.c
> > b/drivers/gpu/drm/i915/gt/intel_sseu.c
> > index 4a0b82fc108c..49316b7ef074 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_sseu.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_sseu.c
> > @@ -8,6 +8,17 @@
> >   #include "intel_lrc_reg.h"
> >   #include "intel_sseu.h"
> >   
> > +void intel_sseu_set_info(struct sseu_dev_info *sseu, u8
> > max_slices,
> > +			 u8 max_subslices, u8 max_eus_per_subslice)
> > +{
> > +	sseu->max_slices = max_slices;
> > +	sseu->max_subslices = max_subslices;
> > +	sseu->max_eus_per_subslice = max_eus_per_subslice;
> > +
> > +	sseu->ss_stride = GEN_SSEU_STRIDE(sseu->max_subslices);
> > +	sseu->eu_stride = GEN_SSEU_STRIDE(sseu->max_eus_per_subslice);
> > +}
> > +
> >   unsigned int
> >   intel_sseu_subslice_total(const struct sseu_dev_info *sseu)
> >   {
> > @@ -22,17 +33,39 @@ intel_sseu_subslice_total(const struct
> > sseu_dev_info *sseu)
> >   unsigned int
> >   intel_sseu_subslices_per_slice(const struct sseu_dev_info *sseu,
> > u8 slice)
> 
> Here we pass slice as u8, but below we use int. Any reason for the 
> difference?

No good reason. I'll fix it.

> 
> >   {
> > -	return hweight8(sseu->subslice_mask[slice]);
> > +	unsigned int i, total = 0;
> > +
> > +	for (i = 0; i < sseu->ss_stride; i++)
> > +		total += hweight8(sseu->subslice_mask[slice * sseu-
> > >ss_stride +
> > +						      i]);
> > +
> > +	return total;
> > +}
> > +
> > +void intel_sseu_copy_subslices(const struct sseu_dev_info *sseu,
> > int slice,
> > +			       u8 *to_mask, const u8 *from_mask)
> 
> You always use sseu->subslice_mask has a from_mask, can't we just
> get 
> that from the sseu param and avoid the from_mask?

I wanted to make this a little more generic, but I agree maybe that's
overkill. I'll rework this.

> 
> > +{
> > +	int offset = slice * sseu->ss_stride;
> > +
> > +	memcpy(&to_mask[offset], &from_mask[offset], sseu->ss_stride);
> > +}
> > +
> > +void intel_sseu_set_subslices(struct sseu_dev_info *sseu, int
> > slice,
> > +			      u32 ss_mask)
> > +{
> > +	int i, offset = slice * sseu->ss_stride;
> > +
> > +	for (i = 0; i < sseu->ss_stride; i++)
> > +		sseu->subslice_mask[offset + i] =
> > +			(ss_mask >> (BITS_PER_BYTE * i)) & 0xff;
> >   }
> >   
> >   static int intel_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;
> > +	int slice_stride = sseu->max_subslices * sseu->eu_stride;
> >   
> > -	return slice * slice_stride + subslice * subslice_stride;
> > +	return slice * slice_stride + subslice * sseu->eu_stride;
> >   }
> >   
> >   u16 intel_sseu_get_eus(const struct sseu_dev_info *sseu, int
> > slice,
> > @@ -41,8 +74,7 @@ u16 intel_sseu_get_eus(const struct sseu_dev_info
> > *sseu, int slice,
> >   	int i, offset = intel_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++) {
> > +	for (i = 0; i < sseu->eu_stride; i++) {
> >   		eu_mask |= ((u16)sseu->eu_mask[offset + i]) <<
> >   			(i * BITS_PER_BYTE);
> >   	}
> > @@ -55,8 +87,7 @@ void intel_sseu_set_eus(struct sseu_dev_info
> > *sseu, int slice, int subslice,
> >   {
> >   	int i, offset = intel_sseu_eu_idx(sseu, slice, subslice);
> >   
> > -	for (i = 0;
> > -	     i < DIV_ROUND_UP(sseu->max_eus_per_subslice,
> > BITS_PER_BYTE); i++) {
> > +	for (i = 0; i < sseu->eu_stride; i++) {
> >   		sseu->eu_mask[offset + i] =
> >   			(eu_mask >> (BITS_PER_BYTE * i)) & 0xff;
> >   	}
> > diff --git a/drivers/gpu/drm/i915/gt/intel_sseu.h
> > b/drivers/gpu/drm/i915/gt/intel_sseu.h
> > index 56e3721ae83f..bf01f338a8cc 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_sseu.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_sseu.h
> > @@ -9,16 +9,18 @@
> >   
> >   #include <linux/types.h>
> >   #include <linux/kernel.h>
> > +#include <linux/string.h>
> >   
> >   struct drm_i915_private;
> >   
> >   #define GEN_MAX_SLICES		(6) /* CNL upper bound */
> >   #define GEN_MAX_SUBSLICES	(8) /* ICL upper bound */
> >   #define GEN_SSEU_STRIDE(bits) DIV_ROUND_UP(bits, BITS_PER_BYTE)
> > +#define GEN_MAX_SUBSLICE_STRIDE GEN_SSEU_STRIDE(GEN_MAX_SUBSLICES)
> >   
> >   struct sseu_dev_info {
> >   	u8 slice_mask;
> > -	u8 subslice_mask[GEN_MAX_SLICES];
> > +	u8 subslice_mask[GEN_MAX_SLICES * GEN_MAX_SUBSLICE_STRIDE];
> >   	u16 eu_total;
> >   	u8 eu_per_subslice;
> >   	u8 min_eu_in_pool;
> > @@ -33,6 +35,9 @@ struct sseu_dev_info {
> >   	u8 max_subslices;
> >   	u8 max_eus_per_subslice;
> >   
> > +	u8 ss_stride;
> > +	u8 eu_stride;
> > +
> >   	/* We don't have more than 8 eus per subslice at the moment and
> > as we
> >   	 * store eus enabled using bits, no need to multiply by eus per
> >   	 * subslice.
> > @@ -63,12 +68,21 @@ intel_sseu_from_device_info(const struct
> > sseu_dev_info *sseu)
> >   	return value;
> >   }
> >   
> > +void intel_sseu_set_info(struct sseu_dev_info *sseu, u8
> > max_slices,
> > +			 u8 max_subslices, u8 max_eus_per_subslice);
> > +
> >   unsigned int
> >   intel_sseu_subslice_total(const struct sseu_dev_info *sseu);
> >   
> >   unsigned int
> >   intel_sseu_subslices_per_slice(const struct sseu_dev_info *sseu,
> > u8 slice);
> >   
> > +void intel_sseu_copy_subslices(const struct sseu_dev_info *sseu,
> > int slice,
> > +			       u8 *to_mask, const u8 *from_mask);
> > +
> > +void intel_sseu_set_subslices(struct sseu_dev_info *sseu, int
> > slice,
> > +			      u32 ss_mask);
> > +
> >   u16 intel_sseu_get_eus(const struct sseu_dev_info *sseu, int
> > slice,
> >   		       int subslice);
> >   
> > diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> > b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> > index 43e290306551..7c7e9556c1c5 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> > @@ -767,7 +767,7 @@ wa_init_mcr(struct drm_i915_private *i915,
> > struct i915_wa_list *wal)
> >   		u32 slice = fls(sseu->slice_mask);
> >   		u32 fuse3 =
> >   			intel_uncore_read(&i915->uncore,
> > GEN10_MIRROR_FUSE3);
> > -		u8 ss_mask = sseu->subslice_mask[slice];
> > +		u8 ss_mask = sseu->subslice_mask[slice * sseu-
> > >ss_stride];
> 
> could use a
> 
> 	GEM_BUG_ON(sseu->ss_stride > 1);
> 
> here as well to remind us this will need changes in that case

Ok.

> 
> >   
> >   		u8 enabled_mask = (ss_mask | ss_mask >>
> >   				   GEN10_L3BANK_PAIR_COUNT) &
> > GEN10_L3BANK_MASK;
> > diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
> > b/drivers/gpu/drm/i915/i915_debugfs.c
> > index 3f3ee83ac315..08089c24db25 100644
> > --- a/drivers/gpu/drm/i915/i915_debugfs.c
> > +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> > @@ -1257,6 +1257,7 @@ static void i915_instdone_info(struct
> > drm_i915_private *dev_priv,
> >   			       struct seq_file *m,
> >   			       struct intel_instdone *instdone)
> >   {
> > +	struct sseu_dev_info *sseu = &RUNTIME_INFO(dev_priv)->sseu;
> >   	int slice;
> >   	int subslice;
> >   
> > @@ -1272,11 +1273,11 @@ static void i915_instdone_info(struct
> > drm_i915_private *dev_priv,
> >   	if (INTEL_GEN(dev_priv) <= 6)
> >   		return;
> >   
> > -	for_each_instdone_slice_subslice(dev_priv, slice, subslice)
> > +	for_each_instdone_slice_subslice(dev_priv, sseu, slice,
> > subslice)
> >   		seq_printf(m, "\t\tSAMPLER_INSTDONE[%d][%d]: 0x%08x\n",
> >   			   slice, subslice, instdone-
> > >sampler[slice][subslice]);
> >   
> > -	for_each_instdone_slice_subslice(dev_priv, slice, subslice)
> > +	for_each_instdone_slice_subslice(dev_priv, sseu, slice,
> > subslice)
> >   		seq_printf(m, "\t\tROW_INSTDONE[%d][%d]: 0x%08x\n",
> >   			   slice, subslice, instdone-
> > >row[slice][subslice]);
> >   }
> > @@ -4066,7 +4067,9 @@ static void gen10_sseu_device_status(struct
> > drm_i915_private *dev_priv,
> >   			continue;
> >   
> >   		sseu->slice_mask |= BIT(s);
> > -		sseu->subslice_mask[s] = info->sseu.subslice_mask[s];
> > +		intel_sseu_copy_subslices(&info->sseu, s,
> > +					  sseu->subslice_mask,
> > +					  info->sseu.subslice_mask);
> >   
> >   		for (ss = 0; ss < info->sseu.max_subslices; ss++) {
> >   			unsigned int eu_cnt;
> > @@ -4117,18 +4120,22 @@ static void gen9_sseu_device_status(struct
> > drm_i915_private *dev_priv,
> >   		sseu->slice_mask |= BIT(s);
> >   
> >   		if (IS_GEN9_BC(dev_priv))
> > -			sseu->subslice_mask[s] =
> > -				RUNTIME_INFO(dev_priv)-
> > >sseu.subslice_mask[s];
> > +			intel_sseu_copy_subslices(&info->sseu, s,
> > +						  sseu->subslice_mask,
> > +						  info-
> > >sseu.subslice_mask);
> >   
> >   		for (ss = 0; ss < info->sseu.max_subslices; ss++) {
> >   			unsigned int eu_cnt;
> > +			u8 ss_idx = s * info->sseu.ss_stride +
> > +				    ss / BITS_PER_BYTE;
> >   
> >   			if (IS_GEN9_LP(dev_priv)) {
> >   				if (!(s_reg[s] &
> > (GEN9_PGCTL_SS_ACK(ss))))
> >   					/* skip disabled subslice */
> >   					continue;
> >   
> > -				sseu->subslice_mask[s] |= BIT(ss);
> > +				sseu->subslice_mask[ss_idx] |=
> > +					BIT(ss % BITS_PER_BYTE);
> >   			}
> >   
> >   			eu_cnt = 2 * hweight32(eu_reg[2*s + ss/2] &
> > @@ -4145,25 +4152,24 @@ static void gen9_sseu_device_status(struct
> > drm_i915_private *dev_priv,
> >   static void broadwell_sseu_device_status(struct drm_i915_private
> > *dev_priv,
> >   					 struct sseu_dev_info *sseu)
> >   {
> > +	struct intel_runtime_info *info = RUNTIME_INFO(dev_priv);
> >   	u32 slice_info = I915_READ(GEN8_GT_SLICE_INFO);
> >   	int s;
> >   
> >   	sseu->slice_mask = slice_info & GEN8_LSLICESTAT_MASK;
> >   
> >   	if (sseu->slice_mask) {
> > -		sseu->eu_per_subslice =
> > -			RUNTIME_INFO(dev_priv)->sseu.eu_per_subslice;
> > -		for (s = 0; s < fls(sseu->slice_mask); s++) {
> > -			sseu->subslice_mask[s] =
> > -				RUNTIME_INFO(dev_priv)-
> > >sseu.subslice_mask[s];
> > -		}
> > +		sseu->eu_per_subslice = info->sseu.eu_per_subslice;
> > +		for (s = 0; s < fls(sseu->slice_mask); s++)
> > +			intel_sseu_copy_subslices(&info->sseu, s,
> > +						  sseu->subslice_mask,
> > +						  info-
> > >sseu.subslice_mask);
> >   		sseu->eu_total = sseu->eu_per_subslice *
> >   				 intel_sseu_subslice_total(sseu);
> >   
> >   		/* subtract fused off EU(s) from enabled slice(s) */
> >   		for (s = 0; s < fls(sseu->slice_mask); s++) {
> > -			u8 subslice_7eu =
> > -				RUNTIME_INFO(dev_priv)-
> > >sseu.subslice_7eu[s];
> > +			u8 subslice_7eu = info->sseu.subslice_7eu[s];
> >   
> >   			sseu->eu_total -= hweight8(subslice_7eu);
> >   		}
> > @@ -4210,6 +4216,7 @@ static void i915_print_sseu_info(struct
> > seq_file *m, bool is_available_info,
> >   static int i915_sseu_status(struct seq_file *m, void *unused)
> >   {
> >   	struct drm_i915_private *dev_priv = node_to_i915(m->private);
> > +	const struct intel_runtime_info *info = RUNTIME_INFO(dev_priv);
> >   	struct sseu_dev_info sseu;
> >   	intel_wakeref_t wakeref;
> >   
> > @@ -4217,14 +4224,13 @@ static int i915_sseu_status(struct seq_file
> > *m, void *unused)
> >   		return -ENODEV;
> >   
> >   	seq_puts(m, "SSEU Device Info\n");
> > -	i915_print_sseu_info(m, true, &RUNTIME_INFO(dev_priv)->sseu);
> > +	i915_print_sseu_info(m, true, &info->sseu);
> >   
> >   	seq_puts(m, "SSEU Device Status\n");
> >   	memset(&sseu, 0, sizeof(sseu));
> > -	sseu.max_slices = RUNTIME_INFO(dev_priv)->sseu.max_slices;
> > -	sseu.max_subslices = RUNTIME_INFO(dev_priv)-
> > >sseu.max_subslices;
> > -	sseu.max_eus_per_subslice =
> > -		RUNTIME_INFO(dev_priv)->sseu.max_eus_per_subslice;
> > +	intel_sseu_set_info(&sseu, info->sseu.max_slices,
> > +			    info->sseu.max_subslices,
> > +			    info->sseu.max_eus_per_subslice);
> >   
> >   	with_intel_runtime_pm(dev_priv, wakeref) {
> >   		if (IS_CHERRYVIEW(dev_priv))
> > diff --git a/drivers/gpu/drm/i915/i915_drv.c
> > b/drivers/gpu/drm/i915/i915_drv.c
> > index 130c5140db0d..6afe4e3afea4 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.c
> > +++ b/drivers/gpu/drm/i915/i915_drv.c
> > @@ -326,7 +326,7 @@ static int i915_getparam_ioctl(struct
> > drm_device *dev, void *data,
> >   	struct pci_dev *pdev = dev_priv->drm.pdev;
> >   	const struct sseu_dev_info *sseu = &RUNTIME_INFO(dev_priv)-
> > >sseu;
> >   	drm_i915_getparam_t *param = data;
> > -	int value;
> > +	int value = 0;
> >   
> >   	switch (param->param) {
> >   	case I915_PARAM_IRQ_ACTIVE:
> > @@ -455,7 +455,9 @@ static int i915_getparam_ioctl(struct
> > drm_device *dev, void *data,
> >   			return -ENODEV;
> >   		break;
> >   	case I915_PARAM_SUBSLICE_MASK:
> > -		value = sseu->subslice_mask[0];
> > +		/* Only copy bits from the first subslice */
> 
> s/subslice/slice/ ?

True, thanks.

> 
> > +		memcpy(&value, sseu->subslice_mask,
> > +		       min(sseu->ss_stride, (u8)sizeof(value)));
> >   		if (!value)
> >   			return -ENODEV;
> >   		break;
> > diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c
> > b/drivers/gpu/drm/i915/i915_gpu_error.c
> > index e1b858bd1d32..140918dd9b7d 100644
> > --- a/drivers/gpu/drm/i915/i915_gpu_error.c
> > +++ b/drivers/gpu/drm/i915/i915_gpu_error.c
> > @@ -407,6 +407,7 @@ static void print_error_buffers(struct
> > drm_i915_error_state_buf *m,
> >   static void error_print_instdone(struct drm_i915_error_state_buf
> > *m,
> >   				 const struct drm_i915_error_engine
> > *ee)
> >   {
> > +	struct sseu_dev_info *sseu = &RUNTIME_INFO(m->i915)->sseu;
> >   	int slice;
> >   	int subslice;
> >   
> > @@ -422,12 +423,12 @@ static void error_print_instdone(struct
> > drm_i915_error_state_buf *m,
> >   	if (INTEL_GEN(m->i915) <= 6)
> >   		return;
> >   
> > -	for_each_instdone_slice_subslice(m->i915, slice, subslice)
> > +	for_each_instdone_slice_subslice(m->i915, sseu, slice,
> > subslice)
> >   		err_printf(m, "  SAMPLER_INSTDONE[%d][%d]: 0x%08x\n",
> >   			   slice, subslice,
> >   			   ee->instdone.sampler[slice][subslice]);
> >   
> > -	for_each_instdone_slice_subslice(m->i915, slice, subslice)
> > +	for_each_instdone_slice_subslice(m->i915, sseu, slice,
> > subslice)
> >   		err_printf(m, "  ROW_INSTDONE[%d][%d]: 0x%08x\n",
> >   			   slice, subslice,
> >   			   ee->instdone.row[slice][subslice]);
> > diff --git a/drivers/gpu/drm/i915/i915_query.c
> > b/drivers/gpu/drm/i915/i915_query.c
> > index 7c1708c22811..000dcb145ce0 100644
> > --- a/drivers/gpu/drm/i915/i915_query.c
> > +++ b/drivers/gpu/drm/i915/i915_query.c
> > @@ -37,8 +37,6 @@ static int query_topology_info(struct
> > drm_i915_private *dev_priv,
> >   	const struct sseu_dev_info *sseu = &RUNTIME_INFO(dev_priv)-
> > >sseu;
> >   	struct drm_i915_query_topology_info topo;
> >   	u32 slice_length, subslice_length, eu_length, total_length;
> > -	u8 subslice_stride = GEN_SSEU_STRIDE(sseu->max_subslices);
> > -	u8 eu_stride = GEN_SSEU_STRIDE(sseu->max_eus_per_subslice);
> >   	int ret;
> >   
> >   	if (query_item->flags != 0)
> > @@ -50,8 +48,8 @@ static int query_topology_info(struct
> > drm_i915_private *dev_priv,
> >   	BUILD_BUG_ON(sizeof(u8) != sizeof(sseu->slice_mask));
> >   
> >   	slice_length = sizeof(sseu->slice_mask);
> > -	subslice_length = sseu->max_slices * subslice_stride;
> > -	eu_length = sseu->max_slices * sseu->max_subslices * eu_stride;
> > +	subslice_length = sseu->max_slices * sseu->ss_stride;
> > +	eu_length = sseu->max_slices * sseu->max_subslices * sseu-
> > >eu_stride;
> >   	total_length = sizeof(topo) + slice_length + subslice_length +
> >   		       eu_length;
> >   
> > @@ -69,9 +67,9 @@ static int query_topology_info(struct
> > drm_i915_private *dev_priv,
> >   	topo.max_eus_per_subslice = sseu->max_eus_per_subslice;
> >   
> >   	topo.subslice_offset = slice_length;
> > -	topo.subslice_stride = subslice_stride;
> > +	topo.subslice_stride = sseu->ss_stride;
> >   	topo.eu_offset = slice_length + subslice_length;
> > -	topo.eu_stride = eu_stride;
> > +	topo.eu_stride = sseu->eu_stride;
> >   
> >   	if (__copy_to_user(u64_to_user_ptr(query_item->data_ptr),
> >   			   &topo, sizeof(topo)))
> > diff --git a/drivers/gpu/drm/i915/intel_device_info.c
> > b/drivers/gpu/drm/i915/intel_device_info.c
> > index e1dbccf04cd9..bbbc0a8c2183 100644
> > --- a/drivers/gpu/drm/i915/intel_device_info.c
> > +++ b/drivers/gpu/drm/i915/intel_device_info.c
> > @@ -84,17 +84,42 @@ void intel_device_info_dump_flags(const struct
> > intel_device_info *info,
> >   #undef PRINT_FLAG
> >   }
> >   
> > +#define SS_STR_MAX_SIZE (GEN_MAX_SUBSLICE_STRIDE * 2)
> > +
> > +static u8 *
> > +subslice_per_slice_str(u8 *buf, const struct sseu_dev_info *sseu,
> > u8 slice)
> > +{
> > +	int i;
> > +	u8 ss_offset = slice * sseu->ss_stride;
> > +
> > +	GEM_BUG_ON(slice >= sseu->max_slices);
> > +
> > +	memset(buf, 0, SS_STR_MAX_SIZE);
> > +
> > +	/*
> > +	 * Print subslice information in reverse order to match
> > +	 * userspace expectations.
> > +	 */
> > +	for (i = 0; i < sseu->ss_stride; i++)
> > +		sprintf(&buf[i * 2], "%02x",
> > +			sseu->subslice_mask[ss_offset + sseu->ss_stride 
> > -
> > +					    (i + 1)]);
> > +
> > +	return buf;
> > +}
> > +
> >   static void sseu_dump(const struct sseu_dev_info *sseu, struct
> > drm_printer *p)
> >   {
> >   	int s;
> > +	u8 buf[SS_STR_MAX_SIZE];
> >   
> >   	drm_printf(p, "slice total: %u, mask=%04x\n",
> >   		   hweight8(sseu->slice_mask), sseu->slice_mask);
> >   	drm_printf(p, "subslice total: %u\n",
> > intel_sseu_subslice_total(sseu));
> >   	for (s = 0; s < sseu->max_slices; s++) {
> > -		drm_printf(p, "slice%d: %u subslices, mask=%04x\n",
> > +		drm_printf(p, "slice%d: %u subslices, mask=%s\n",
> >   			   s, intel_sseu_subslices_per_slice(sseu, s),
> > -			   sseu->subslice_mask[s]);
> > +			   subslice_per_slice_str(buf, sseu, s));
> >   	}
> >   	drm_printf(p, "EU total: %u\n", sseu->eu_total);
> >   	drm_printf(p, "EU per subslice: %u\n", sseu->eu_per_subslice);
> > @@ -118,6 +143,7 @@ void intel_device_info_dump_topology(const
> > struct sseu_dev_info *sseu,
> >   				     struct drm_printer *p)
> >   {
> >   	int s, ss;
> > +	u8 buf[SS_STR_MAX_SIZE];
> >   
> >   	if (sseu->max_slices == 0) {
> >   		drm_printf(p, "Unavailable\n");
> > @@ -125,9 +151,9 @@ void intel_device_info_dump_topology(const
> > struct sseu_dev_info *sseu,
> >   	}
> >   
> >   	for (s = 0; s < sseu->max_slices; s++) {
> > -		drm_printf(p, "slice%d: %u subslice(s) (0x%hhx):\n",
> > +		drm_printf(p, "slice%d: %u subslice(s) (0x%s):\n",
> >   			   s, intel_sseu_subslices_per_slice(sseu, s),
> > -			   sseu->subslice_mask[s]);
> > +			   subslice_per_slice_str(buf, sseu, s));
> >   
> >   		for (ss = 0; ss < sseu->max_subslices; ss++) {
> >   			u16 enabled_eus = intel_sseu_get_eus(sseu, s,
> > ss);
> > @@ -156,15 +182,10 @@ static void gen11_sseu_info_init(struct
> > drm_i915_private *dev_priv)
> >   	u8 eu_en;
> >   	int s;
> >   
> > -	if (IS_ELKHARTLAKE(dev_priv)) {
> > -		sseu->max_slices = 1;
> > -		sseu->max_subslices = 4;
> > -		sseu->max_eus_per_subslice = 8;
> > -	} else {
> > -		sseu->max_slices = 1;
> > -		sseu->max_subslices = 8;
> > -		sseu->max_eus_per_subslice = 8;
> > -	}
> > +	if (IS_ELKHARTLAKE(dev_priv))
> > +		intel_sseu_set_info(sseu, 1, 4, 8);
> > +	else
> > +		intel_sseu_set_info(sseu, 1, 8, 8);
> >   
> >   	s_en = I915_READ(GEN11_GT_SLICE_ENABLE) & GEN11_GT_S_ENA_MASK;
> >   	ss_en = ~I915_READ(GEN11_GT_SUBSLICE_DISABLE);
> > @@ -177,9 +198,11 @@ static void gen11_sseu_info_init(struct
> > drm_i915_private *dev_priv)
> >   			int ss;
> >   
> >   			sseu->slice_mask |= BIT(s);
> > -			sseu->subslice_mask[s] = (ss_en >> ss_idx) &
> > ss_en_mask;
> > +			sseu->subslice_mask[s * sseu->ss_stride] =
> > +				(ss_en >> ss_idx) & ss_en_mask;
> 
> Shouldn't this just call intel_sseu_set_subslices() instead of doing
> the 
> setting locally?

Yes, let me fix this.

> 
> >   			for (ss = 0; ss < sseu->max_subslices; ss++) {
> > -				if (sseu->subslice_mask[s] & BIT(ss))
> > +				if (sseu->subslice_mask[s * sseu-
> > >ss_stride] &
> > +				    BIT(ss))
> 
> This culd use the intel_sseu_has_subslice() suggested earlier,
> otherwise 
> it needs to consider ss_stride > 1

Ok.

> 
> >   					intel_sseu_set_eus(sseu, s, ss,
> > eu_en);
> >   			}
> >   		}
> > @@ -201,23 +224,10 @@ static void gen10_sseu_info_init(struct
> > drm_i915_private *dev_priv)
> >   	const int eu_mask = 0xff;
> >   	u32 subslice_mask, eu_en;
> >   
> > +	intel_sseu_set_info(sseu, 6, 4, 8);
> > +
> >   	sseu->slice_mask = (fuse2 & GEN10_F2_S_ENA_MASK) >>
> >   			    GEN10_F2_S_ENA_SHIFT;
> > -	sseu->max_slices = 6;
> > -	sseu->max_subslices = 4;
> > -	sseu->max_eus_per_subslice = 8;
> > -
> > -	subslice_mask = (1 << 4) - 1;
> > -	subslice_mask &= ~((fuse2 & GEN10_F2_SS_DIS_MASK) >>
> > -			   GEN10_F2_SS_DIS_SHIFT);
> > -
> > -	/*
> > -	 * Slice0 can have up to 3 subslices, but there are only 2 in
> > -	 * slice1/2.
> > -	 */
> > -	sseu->subslice_mask[0] = subslice_mask;
> > -	for (s = 1; s < sseu->max_slices; s++)
> > -		sseu->subslice_mask[s] = subslice_mask & 0x3;
> >   
> >   	/* Slice0 */
> >   	eu_en = ~I915_READ(GEN8_EU_DISABLE0);
> > @@ -242,14 +252,22 @@ static void gen10_sseu_info_init(struct
> > drm_i915_private *dev_priv)
> >   	eu_en = ~I915_READ(GEN10_EU_DISABLE3);
> >   	intel_sseu_set_eus(sseu, 5, 1, eu_en & eu_mask);
> >   
> > -	/* Do a second pass where we mark the subslices disabled if all
> > their
> > -	 * eus are off.
> > -	 */
> > +	subslice_mask = (1 << 4) - 1;
> > +	subslice_mask &= ~((fuse2 & GEN10_F2_SS_DIS_MASK) >>
> > +			   GEN10_F2_SS_DIS_SHIFT);
> > +
> >   	for (s = 0; s < sseu->max_slices; s++) {
> >   		for (ss = 0; ss < sseu->max_subslices; ss++) {
> >   			if (intel_sseu_get_eus(sseu, s, ss) == 0)
> > -				sseu->subslice_mask[s] &= ~BIT(ss);
> > +				subslice_mask &= ~BIT(ss);
> >   		}
> > +
> > +		/*
> > +		 * Slice0 can have up to 3 subslices, but there are
> > only 2 in
> > +		 * slice1/2.
> > +		 */
> > +		intel_sseu_set_subslices(sseu, s, s == 0 ?
> > subslice_mask :
> > +							   subslice_mas
> > k & 0x3);
> >   	}
> >   
> >   	sseu->eu_total = compute_eu_total(sseu);
> > @@ -275,13 +293,12 @@ static void cherryview_sseu_info_init(struct
> > drm_i915_private *dev_priv)
> >   {
> >   	struct sseu_dev_info *sseu = &RUNTIME_INFO(dev_priv)->sseu;
> >   	u32 fuse;
> > +	u8 subslice_mask;
> >   
> >   	fuse = I915_READ(CHV_FUSE_GT);
> >   
> >   	sseu->slice_mask = BIT(0);
> > -	sseu->max_slices = 1;
> > -	sseu->max_subslices = 2;
> > -	sseu->max_eus_per_subslice = 8;
> > +	intel_sseu_set_info(sseu, 1, 2, 8);
> >   
> >   	if (!(fuse & CHV_FGT_DISABLE_SS0)) {
> >   		u8 disabled_mask =
> > @@ -290,7 +307,7 @@ static void cherryview_sseu_info_init(struct
> > drm_i915_private *dev_priv)
> >   			(((fuse & CHV_FGT_EU_DIS_SS0_R1_MASK) >>
> >   			  CHV_FGT_EU_DIS_SS0_R1_SHIFT) << 4);
> >   
> > -		sseu->subslice_mask[0] |= BIT(0);
> > +		subslice_mask |= BIT(0);
> >   		intel_sseu_set_eus(sseu, 0, 0, ~disabled_mask);
> >   	}
> >   
> > @@ -301,10 +318,12 @@ static void cherryview_sseu_info_init(struct
> > drm_i915_private *dev_priv)
> >   			(((fuse & CHV_FGT_EU_DIS_SS1_R1_MASK) >>
> >   			  CHV_FGT_EU_DIS_SS1_R1_SHIFT) << 4);
> >   
> > -		sseu->subslice_mask[0] |= BIT(1);
> > +		subslice_mask |= BIT(1);
> >   		intel_sseu_set_eus(sseu, 0, 1, ~disabled_mask);
> >   	}
> >   
> > +	intel_sseu_set_subslices(sseu, 0, subslice_mask);
> > +
> >   	sseu->eu_total = compute_eu_total(sseu);
> >   
> >   	/*
> > @@ -312,7 +331,8 @@ static void cherryview_sseu_info_init(struct
> > drm_i915_private *dev_priv)
> >   	 * across subslices.
> >   	*/
> >   	sseu->eu_per_subslice = intel_sseu_subslice_total(sseu) ?
> > -				sseu->eu_total /
> > intel_sseu_subslice_total(sseu) :
> > +				sseu->eu_total /
> > +					intel_sseu_subslice_total(sseu)
> > :
> >   				0;
> >   	/*
> >   	 * CHV supports subslice power gating on devices with more than
> > @@ -336,9 +356,8 @@ static void gen9_sseu_info_init(struct
> > drm_i915_private *dev_priv)
> >   	sseu->slice_mask = (fuse2 & GEN8_F2_S_ENA_MASK) >>
> > GEN8_F2_S_ENA_SHIFT;
> >   
> >   	/* BXT has a single slice and at most 3 subslices. */
> > -	sseu->max_slices = IS_GEN9_LP(dev_priv) ? 1 : 3;
> > -	sseu->max_subslices = IS_GEN9_LP(dev_priv) ? 3 : 4;
> > -	sseu->max_eus_per_subslice = 8;
> > +	intel_sseu_set_info(sseu, IS_GEN9_LP(dev_priv) ? 1 : 3,
> > +			    IS_GEN9_LP(dev_priv) ? 3 : 4, 8);
> >   
> >   	/*
> >   	 * The subslice disable field is global, i.e. it applies
> > @@ -357,14 +376,16 @@ static void gen9_sseu_info_init(struct
> > drm_i915_private *dev_priv)
> >   			/* skip disabled slice */
> >   			continue;
> >   
> > -		sseu->subslice_mask[s] = subslice_mask;
> > +		intel_sseu_set_subslices(sseu, s, subslice_mask);
> >   
> >   		eu_disable = I915_READ(GEN9_EU_DISABLE(s));
> >   		for (ss = 0; ss < sseu->max_subslices; ss++) {
> >   			int eu_per_ss;
> >   			u8 eu_disabled_mask;
> > +			u8 ss_idx = s * sseu->ss_stride + ss /
> > BITS_PER_BYTE;
> >   
> > -			if (!(sseu->subslice_mask[s] & BIT(ss)))
> > +			if (!(sseu->subslice_mask[ss_idx] &
> > +			      BIT(ss % BITS_PER_BYTE)))
> >   				/* skip disabled subslice */
> >   				continue;
> >   
> > @@ -437,9 +458,7 @@ static void broadwell_sseu_info_init(struct
> > drm_i915_private *dev_priv)
> >   
> >   	fuse2 = I915_READ(GEN8_FUSE2);
> >   	sseu->slice_mask = (fuse2 & GEN8_F2_S_ENA_MASK) >>
> > GEN8_F2_S_ENA_SHIFT;
> > -	sseu->max_slices = 3;
> > -	sseu->max_subslices = 3;
> > -	sseu->max_eus_per_subslice = 8;
> > +	intel_sseu_set_info(sseu, 3, 3, 8);
> >   
> >   	/*
> >   	 * The subslice disable field is global, i.e. it applies
> > @@ -466,18 +485,21 @@ static void broadwell_sseu_info_init(struct
> > drm_i915_private *dev_priv)
> >   			/* skip disabled slice */
> >   			continue;
> >   
> > -		sseu->subslice_mask[s] = subslice_mask;
> > +		intel_sseu_set_subslices(sseu, s, subslice_mask);
> >   
> >   		for (ss = 0; ss < sseu->max_subslices; ss++) {
> >   			u8 eu_disabled_mask;
> > +			u8 ss_idx = s * sseu->ss_stride + ss /
> > BITS_PER_BYTE;
> >   			u32 n_disabled;
> >   
> > -			if (!(sseu->subslice_mask[s] & BIT(ss)))
> > +			if (!(sseu->subslice_mask[ss_idx] &
> > +			      BIT(ss % BITS_PER_BYTE)))
> >   				/* skip disabled subslice */
> >   				continue;
> >   
> >   			eu_disabled_mask =
> > -				eu_disable[s] >> (ss * sseu-
> > >max_eus_per_subslice);
> > +				eu_disable[s] >>
> > +					(ss * sseu-
> > >max_eus_per_subslice);
> >   
> >   			intel_sseu_set_eus(sseu, s, ss,
> > ~eu_disabled_mask);
> >   
> > @@ -517,6 +539,7 @@ static void haswell_sseu_info_init(struct
> > drm_i915_private *dev_priv)
> >   	struct sseu_dev_info *sseu = &RUNTIME_INFO(dev_priv)->sseu;
> >   	u32 fuse1;
> >   	int s, ss;
> > +	u32 subslice_mask;
> >   
> >   	/*
> >   	 * There isn't a register to tell us how many slices/subslices.
> > We
> > @@ -528,22 +551,18 @@ static void haswell_sseu_info_init(struct
> > drm_i915_private *dev_priv)
> >   		/* fall through */
> >   	case 1:
> >   		sseu->slice_mask = BIT(0);
> > -		sseu->subslice_mask[0] = BIT(0);
> > +		subslice_mask = BIT(0);
> >   		break;
> >   	case 2:
> >   		sseu->slice_mask = BIT(0);
> > -		sseu->subslice_mask[0] = BIT(0) | BIT(1);
> > +		subslice_mask = BIT(0) | BIT(1);
> >   		break;
> >   	case 3:
> >   		sseu->slice_mask = BIT(0) | BIT(1);
> > -		sseu->subslice_mask[0] = BIT(0) | BIT(1);
> > -		sseu->subslice_mask[1] = BIT(0) | BIT(1);
> > +		subslice_mask = BIT(0) | BIT(1);
> >   		break;
> >   	}
> >   
> > -	sseu->max_slices = hweight8(sseu->slice_mask);
> > -	sseu->max_subslices = hweight8(sseu->subslice_mask[0]);
> > -
> >   	fuse1 = I915_READ(HSW_PAVP_FUSE1);
> >   	switch ((fuse1 & HSW_F1_EU_DIS_MASK) >> HSW_F1_EU_DIS_SHIFT) {
> >   	default:
> > @@ -560,9 +579,14 @@ static void haswell_sseu_info_init(struct
> > drm_i915_private *dev_priv)
> >   		sseu->eu_per_subslice = 6;
> >   		break;
> >   	}
> > -	sseu->max_eus_per_subslice = sseu->eu_per_subslice;
> > +
> > +	intel_sseu_set_info(sseu, hweight8(sseu->slice_mask),
> > +			    hweight8(subslice_mask),
> > +			    sseu->eu_per_subslice);
> 
> Personal preference: could use a local variable for eu_per_subslice 
> above to avoid setting it to itself here.

Yeah this is a bit ugly... I'll change it.

Thanks for the feedback!
Stuart

> 
> Daniele
> 
> >   
> >   	for (s = 0; s < sseu->max_slices; s++) {
> > +		intel_sseu_set_subslices(sseu, s, subslice_mask);
> > +
> >   		for (ss = 0; ss < sseu->max_subslices; ss++) {
> >   			intel_sseu_set_eus(sseu, s, ss,
> >   					   (1UL << sseu-
> > >eu_per_subslice) - 1);
> > 

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