Re: [PATCH] drm/i915/mtl: Define MOCS and PAT tables for MTL

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On Thu, Apr 20, 2023 at 02:23:22PM -0700, Matt Roper wrote:
> On Thu, Apr 20, 2023 at 11:13:52PM +0200, Andi Shyti wrote:
> > From: Madhumitha Tolakanahalli Pradeep <madhumitha.tolakanahalli.pradeep@xxxxxxxxx>
> > 
> > On MTL, GT can no longer allocate on LLC - only the CPU can.
> > This, along with addition of support for L4 cache calls for
> > a MOCS/PAT table update.
> > Also the PAT index registers are multicasted for primary GT,
> > and there is an address jump from index 7 to 8. This patch
> > makes sure that these registers are programmed in the proper
> > way.
> > 
> > BSpec: 44509, 45101, 44235
> > 
> > Cc: Matt Roper <matthew.d.roper@xxxxxxxxx>
> > Cc: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
> > Signed-off-by: Madhumitha Tolakanahalli Pradeep <madhumitha.tolakanahalli.pradeep@xxxxxxxxx>
> > Signed-off-by: Aravind Iddamsetty <aravind.iddamsetty@xxxxxxxxx>
> > Signed-off-by: Nirmoy Das <nirmoy.das@xxxxxxxxx>
> > Signed-off-by: Fei Yang <fei.yang@xxxxxxxxx>
> > Reviewed-by: Andrzej Hajda <andrzej.hajda@xxxxxxxxx>
> > Reviewed-by: Nirmoy Das <nirmoy.das@xxxxxxxxx>
> > Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>
> > Signed-off-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>
> > ---
> > Hi,
> > 
> > just extracting this patch from Fei's series.
> 
> I just posted some feedback on Fei's series about an hour ago:
> 
> https://lore.kernel.org/intel-gfx/20230420202904.GY4085390@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/

Yes, sorry! I read your comments but I was in a patch sending
frenzy :-P

> Basically there's extra stuff in this patch that doesn't relate to the
> primary topic of defining the MOCS and PAT tables for MTL.  E.g., the
> PTE bits aren't used in this patch and should be moved to the following
> patch that deals with page table encoding (and at least one of those
> bits likely isn't correct from what I see in the bspec).

Yes... I made the same comment patches ago... I don't really mind
though, but I agree it's better to remove the parts we don't
need.

Andi

> Also the GSI changes at the bottom seem to be trying to work around a
> shortcoming of the selftest; it would likely be better to handle that in
> the selftest itself (which can probably be a separate patch).
> 
> 
> Matt
> 
> > 
> > Andi
> > 
> >  drivers/gpu/drm/i915/gt/intel_gt_regs.h |  6 +-
> >  drivers/gpu/drm/i915/gt/intel_gtt.c     | 47 ++++++++++++++-
> >  drivers/gpu/drm/i915/gt/intel_gtt.h     | 20 ++++++-
> >  drivers/gpu/drm/i915/gt/intel_mocs.c    | 76 +++++++++++++++++++++++--
> >  drivers/gpu/drm/i915/gt/selftest_mocs.c |  2 +-
> >  5 files changed, 143 insertions(+), 8 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> > index fd1f9cd35e9d7..e8c3b762a92a3 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> > @@ -356,7 +356,11 @@
> >  #define GEN7_TLB_RD_ADDR			_MMIO(0x4700)
> >  
> >  #define GEN12_PAT_INDEX(index)			_MMIO(0x4800 + (index) * 4)
> > -#define XEHP_PAT_INDEX(index)			MCR_REG(0x4800 + (index) * 4)
> > +#define _PAT_INDEX(index)			_PICK_EVEN_2RANGES(index, 8, \
> > +								   0x4800, 0x4804, \
> > +								   0x4848, 0x484c)
> > +#define XEHP_PAT_INDEX(index)			MCR_REG(_PAT_INDEX(index))
> > +#define XELPMP_PAT_INDEX(index)			_MMIO(_PAT_INDEX(index))
> >  
> >  #define XEHP_TILE0_ADDR_RANGE			MCR_REG(0x4900)
> >  #define   XEHP_TILE_LMEM_RANGE_SHIFT		8
> > diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c b/drivers/gpu/drm/i915/gt/intel_gtt.c
> > index 4f436ba7a3c83..2f6a9be0ffe61 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_gtt.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_gtt.c
> > @@ -468,6 +468,44 @@ void gtt_write_workarounds(struct intel_gt *gt)
> >  	}
> >  }
> >  
> > +static void xelpmp_setup_private_ppat(struct intel_uncore *uncore)
> > +{
> > +	intel_uncore_write(uncore, XELPMP_PAT_INDEX(0),
> > +			   MTL_PPAT_L4_0_WB);
> > +	intel_uncore_write(uncore, XELPMP_PAT_INDEX(1),
> > +			   MTL_PPAT_L4_1_WT);
> > +	intel_uncore_write(uncore, XELPMP_PAT_INDEX(2),
> > +			   MTL_PPAT_L4_3_UC);
> > +	intel_uncore_write(uncore, XELPMP_PAT_INDEX(3),
> > +			   MTL_PPAT_L4_0_WB | MTL_2_COH_1W);
> > +	intel_uncore_write(uncore, XELPMP_PAT_INDEX(4),
> > +			   MTL_PPAT_L4_0_WB | MTL_3_COH_2W);
> > +
> > +	/*
> > +	 * Remaining PAT entries are left at the hardware-default
> > +	 * fully-cached setting
> > +	 */
> > +}
> > +
> > +static void xelpg_setup_private_ppat(struct intel_gt *gt)
> > +{
> > +	intel_gt_mcr_multicast_write(gt, XEHP_PAT_INDEX(0),
> > +				     MTL_PPAT_L4_0_WB);
> > +	intel_gt_mcr_multicast_write(gt, XEHP_PAT_INDEX(1),
> > +				     MTL_PPAT_L4_1_WT);
> > +	intel_gt_mcr_multicast_write(gt, XEHP_PAT_INDEX(2),
> > +				     MTL_PPAT_L4_3_UC);
> > +	intel_gt_mcr_multicast_write(gt, XEHP_PAT_INDEX(3),
> > +				     MTL_PPAT_L4_0_WB | MTL_2_COH_1W);
> > +	intel_gt_mcr_multicast_write(gt, XEHP_PAT_INDEX(4),
> > +				     MTL_PPAT_L4_0_WB | MTL_3_COH_2W);
> > +
> > +	/*
> > +	 * Remaining PAT entries are left at the hardware-default
> > +	 * fully-cached setting
> > +	 */
> > +}
> > +
> >  static void tgl_setup_private_ppat(struct intel_uncore *uncore)
> >  {
> >  	/* TGL doesn't support LLC or AGE settings */
> > @@ -603,7 +641,14 @@ void setup_private_pat(struct intel_gt *gt)
> >  
> >  	GEM_BUG_ON(GRAPHICS_VER(i915) < 8);
> >  
> > -	if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50))
> > +	if (gt->type == GT_MEDIA) {
> > +		xelpmp_setup_private_ppat(gt->uncore);
> > +		return;
> > +	}
> > +
> > +	if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 70))
> > +		xelpg_setup_private_ppat(gt);
> > +	else if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50))
> >  		xehp_setup_private_ppat(gt);
> >  	else if (GRAPHICS_VER(i915) >= 12)
> >  		tgl_setup_private_ppat(uncore);
> > diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h
> > index 69ce55f517f56..854ec09fd5888 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_gtt.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
> > @@ -88,9 +88,18 @@ typedef u64 gen8_pte_t;
> >  #define BYT_PTE_SNOOPED_BY_CPU_CACHES	REG_BIT(2)
> >  #define BYT_PTE_WRITEABLE		REG_BIT(1)
> >  
> > +#define MTL_PPGTT_PTE_PAT3	BIT_ULL(62)
> >  #define GEN12_PPGTT_PTE_LM	BIT_ULL(11)
> > +#define GEN12_PPGTT_PTE_PAT2	BIT_ULL(7)
> > +#define GEN12_PPGTT_PTE_NC	BIT_ULL(5)
> > +#define GEN12_PPGTT_PTE_PAT1	BIT_ULL(4)
> > +#define GEN12_PPGTT_PTE_PAT0	BIT_ULL(3)
> >  
> > -#define GEN12_GGTT_PTE_LM	BIT_ULL(1)
> > +#define GEN12_GGTT_PTE_LM		BIT_ULL(1)
> > +#define MTL_GGTT_PTE_PAT0		BIT_ULL(52)
> > +#define MTL_GGTT_PTE_PAT1		BIT_ULL(53)
> > +#define GEN12_GGTT_PTE_ADDR_MASK	GENMASK_ULL(45, 12)
> > +#define MTL_GGTT_PTE_PAT_MASK		GENMASK_ULL(53, 52)
> >  
> >  #define GEN12_PDE_64K BIT(6)
> >  #define GEN12_PTE_PS64 BIT(8)
> > @@ -147,6 +156,15 @@ typedef u64 gen8_pte_t;
> >  #define GEN8_PDE_IPS_64K BIT(11)
> >  #define GEN8_PDE_PS_2M   BIT(7)
> >  
> > +#define MTL_PPAT_L4_CACHE_POLICY_MASK	REG_GENMASK(3, 2)
> > +#define MTL_PAT_INDEX_COH_MODE_MASK	REG_GENMASK(1, 0)
> > +#define MTL_PPAT_L4_3_UC	REG_FIELD_PREP(MTL_PPAT_L4_CACHE_POLICY_MASK, 3)
> > +#define MTL_PPAT_L4_1_WT	REG_FIELD_PREP(MTL_PPAT_L4_CACHE_POLICY_MASK, 1)
> > +#define MTL_PPAT_L4_0_WB	REG_FIELD_PREP(MTL_PPAT_L4_CACHE_POLICY_MASK, 0)
> > +#define MTL_3_COH_2W	REG_FIELD_PREP(MTL_PAT_INDEX_COH_MODE_MASK, 3)
> > +#define MTL_2_COH_1W	REG_FIELD_PREP(MTL_PAT_INDEX_COH_MODE_MASK, 2)
> > +#define MTL_0_COH_NON	REG_FIELD_PREP(MTL_PAT_INDEX_COH_MODE_MASK, 0)
> > +
> >  enum i915_cache_level;
> >  
> >  struct drm_i915_gem_object;
> > diff --git a/drivers/gpu/drm/i915/gt/intel_mocs.c b/drivers/gpu/drm/i915/gt/intel_mocs.c
> > index 69b489e8dfeda..89570f137b2cf 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_mocs.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_mocs.c
> > @@ -40,6 +40,10 @@ struct drm_i915_mocs_table {
> >  #define LE_COS(value)		((value) << 15)
> >  #define LE_SSE(value)		((value) << 17)
> >  
> > +/* Defines for the tables (GLOB_MOCS_0 - GLOB_MOCS_16) */
> > +#define _L4_CACHEABILITY(value)	((value) << 2)
> > +#define IG_PAT(value)		((value) << 8)
> > +
> >  /* Defines for the tables (LNCFMOCS0 - LNCFMOCS31) - two entries per word */
> >  #define L3_ESC(value)		((value) << 0)
> >  #define L3_SCC(value)		((value) << 1)
> > @@ -50,6 +54,7 @@ struct drm_i915_mocs_table {
> >  /* Helper defines */
> >  #define GEN9_NUM_MOCS_ENTRIES	64  /* 63-64 are reserved, but configured. */
> >  #define PVC_NUM_MOCS_ENTRIES	3
> > +#define MTL_NUM_MOCS_ENTRIES	16
> >  
> >  /* (e)LLC caching options */
> >  /*
> > @@ -73,6 +78,12 @@ struct drm_i915_mocs_table {
> >  #define L3_2_RESERVED		_L3_CACHEABILITY(2)
> >  #define L3_3_WB			_L3_CACHEABILITY(3)
> >  
> > +/* L4 caching options */
> > +#define L4_0_WB			_L4_CACHEABILITY(0)
> > +#define L4_1_WT			_L4_CACHEABILITY(1)
> > +#define L4_2_RESERVED		_L4_CACHEABILITY(2)
> > +#define L4_3_UC			_L4_CACHEABILITY(3)
> > +
> >  #define MOCS_ENTRY(__idx, __control_value, __l3cc_value) \
> >  	[__idx] = { \
> >  		.control_value = __control_value, \
> > @@ -416,6 +427,57 @@ static const struct drm_i915_mocs_entry pvc_mocs_table[] = {
> >  	MOCS_ENTRY(2, 0, L3_3_WB),
> >  };
> >  
> > +static const struct drm_i915_mocs_entry mtl_mocs_table[] = {
> > +	/* Error - Reserved for Non-Use */
> > +	MOCS_ENTRY(0,
> > +		   IG_PAT(0),
> > +		   L3_LKUP(1) | L3_3_WB),
> > +	/* Cached - L3 + L4 */
> > +	MOCS_ENTRY(1,
> > +		   IG_PAT(1),
> > +		   L3_LKUP(1) | L3_3_WB),
> > +	/* L4 - GO:L3 */
> > +	MOCS_ENTRY(2,
> > +		   IG_PAT(1),
> > +		   L3_LKUP(1) | L3_1_UC),
> > +	/* Uncached - GO:L3 */
> > +	MOCS_ENTRY(3,
> > +		   IG_PAT(1) | L4_3_UC,
> > +		   L3_LKUP(1) | L3_1_UC),
> > +	/* L4 - GO:Mem */
> > +	MOCS_ENTRY(4,
> > +		   IG_PAT(1),
> > +		   L3_LKUP(1) | L3_GLBGO(1) | L3_1_UC),
> > +	/* Uncached - GO:Mem */
> > +	MOCS_ENTRY(5,
> > +		   IG_PAT(1) | L4_3_UC,
> > +		   L3_LKUP(1) | L3_GLBGO(1) | L3_1_UC),
> > +	/* L4 - L3:NoLKUP; GO:L3 */
> > +	MOCS_ENTRY(6,
> > +		   IG_PAT(1),
> > +		   L3_1_UC),
> > +	/* Uncached - L3:NoLKUP; GO:L3 */
> > +	MOCS_ENTRY(7,
> > +		   IG_PAT(1) | L4_3_UC,
> > +		   L3_1_UC),
> > +	/* L4 - L3:NoLKUP; GO:Mem */
> > +	MOCS_ENTRY(8,
> > +		   IG_PAT(1),
> > +		   L3_GLBGO(1) | L3_1_UC),
> > +	/* Uncached - L3:NoLKUP; GO:Mem */
> > +	MOCS_ENTRY(9,
> > +		   IG_PAT(1) | L4_3_UC,
> > +		   L3_GLBGO(1) | L3_1_UC),
> > +	/* Display - L3; L4:WT */
> > +	MOCS_ENTRY(14,
> > +		   IG_PAT(1) | L4_1_WT,
> > +		   L3_LKUP(1) | L3_3_WB),
> > +	/* CCS - Non-Displayable */
> > +	MOCS_ENTRY(15,
> > +		   IG_PAT(1),
> > +		   L3_GLBGO(1) | L3_1_UC),
> > +};
> > +
> >  enum {
> >  	HAS_GLOBAL_MOCS = BIT(0),
> >  	HAS_ENGINE_MOCS = BIT(1),
> > @@ -445,7 +507,13 @@ static unsigned int get_mocs_settings(const struct drm_i915_private *i915,
> >  	memset(table, 0, sizeof(struct drm_i915_mocs_table));
> >  
> >  	table->unused_entries_index = I915_MOCS_PTE;
> > -	if (IS_PONTEVECCHIO(i915)) {
> > +	if (IS_METEORLAKE(i915)) {
> > +		table->size = ARRAY_SIZE(mtl_mocs_table);
> > +		table->table = mtl_mocs_table;
> > +		table->n_entries = MTL_NUM_MOCS_ENTRIES;
> > +		table->uc_index = 9;
> > +		table->unused_entries_index = 1;
> > +	} else if (IS_PONTEVECCHIO(i915)) {
> >  		table->size = ARRAY_SIZE(pvc_mocs_table);
> >  		table->table = pvc_mocs_table;
> >  		table->n_entries = PVC_NUM_MOCS_ENTRIES;
> > @@ -646,9 +714,9 @@ void intel_mocs_init_engine(struct intel_engine_cs *engine)
> >  		init_l3cc_table(engine->gt, &table);
> >  }
> >  
> > -static u32 global_mocs_offset(void)
> > +static u32 global_mocs_offset(struct intel_gt *gt)
> >  {
> > -	return i915_mmio_reg_offset(GEN12_GLOBAL_MOCS(0));
> > +	return i915_mmio_reg_offset(GEN12_GLOBAL_MOCS(0)) + gt->uncore->gsi_offset;
> >  }
> >  
> >  void intel_set_mocs_index(struct intel_gt *gt)
> > @@ -671,7 +739,7 @@ void intel_mocs_init(struct intel_gt *gt)
> >  	 */
> >  	flags = get_mocs_settings(gt->i915, &table);
> >  	if (flags & HAS_GLOBAL_MOCS)
> > -		__init_mocs_table(gt->uncore, &table, global_mocs_offset());
> > +		__init_mocs_table(gt->uncore, &table, global_mocs_offset(gt));
> >  
> >  	/*
> >  	 * Initialize the L3CC table as part of mocs initalization to make
> > diff --git a/drivers/gpu/drm/i915/gt/selftest_mocs.c b/drivers/gpu/drm/i915/gt/selftest_mocs.c
> > index ca009a6a13bdb..7307963465148 100644
> > --- a/drivers/gpu/drm/i915/gt/selftest_mocs.c
> > +++ b/drivers/gpu/drm/i915/gt/selftest_mocs.c
> > @@ -137,7 +137,7 @@ static int read_mocs_table(struct i915_request *rq,
> >  		return 0;
> >  
> >  	if (HAS_GLOBAL_MOCS_REGISTERS(rq->engine->i915))
> > -		addr = global_mocs_offset();
> > +		addr = global_mocs_offset(rq->engine->gt);
> >  	else
> >  		addr = mocs_offset(rq->engine);
> >  
> > -- 
> > 2.40.0
> > 
> 
> -- 
> Matt Roper
> Graphics Software Engineer
> Linux GPU Platform Enablement
> Intel Corporation



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