Re: [Intel-gfx] [PATCH v3 06/30] drm/i915/xehp: handle new steering options

["Yokoyama, Caz" <caz.yokoyama@intel.com>]

On Fri, 2021-07-23 at 10:42 -0700, Matt Roper wrote:
> From: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
> 
> Xe_HP is more modular then its predecessors and as a consequence it 
then -> than

> has
> more types of replicated registers.  As with l3bank regions on
> previous
> platforms, we may need to explicitly re-steer accesses to these new
> types of ranges at runtime if we can't find a single default steering
> value that satisfies the fusing of all types.
> 
> Bspec: 66534
> Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
> Signed-off-by: Daniele Ceraolo Spurio <
> daniele.ceraolospurio@intel.com>
> Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
> ---
>  drivers/gpu/drm/i915/gt/intel_gt.c          | 40 ++++++++-
>  drivers/gpu/drm/i915/gt/intel_gt.h          |  1 +
>  drivers/gpu/drm/i915/gt/intel_gt_types.h    |  7 ++
>  drivers/gpu/drm/i915/gt/intel_region_lmem.c |  1 +
>  drivers/gpu/drm/i915/gt/intel_sseu.c        | 18 +++++
>  drivers/gpu/drm/i915/gt/intel_sseu.h        |  6 ++
>  drivers/gpu/drm/i915/gt/intel_workarounds.c | 89
> +++++++++++++++++++--
>  drivers/gpu/drm/i915/i915_drv.h             |  3 +
>  drivers/gpu/drm/i915/i915_pci.c             |  1 +
>  drivers/gpu/drm/i915/i915_reg.h             |  4 +
>  drivers/gpu/drm/i915/intel_device_info.h    |  1 +
>  11 files changed, 165 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c
> b/drivers/gpu/drm/i915/gt/intel_gt.c
> index 46441607d18b..0ee33a31a3cd 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt.c
> +++ b/drivers/gpu/drm/i915/gt/intel_gt.c
> @@ -89,6 +89,13 @@ static const struct intel_mmio_range
> icl_l3bank_steering_table[] = {
>  	{},
>  };
>  
> +static u16 slicemask(struct intel_gt *gt, int count)
> +{
> +	u64 dss_mask = intel_sseu_get_subslices(&gt->info.sseu, 0);
> +
> +	return intel_slicemask_from_dssmask(dss_mask, count);
> +}
> +
>  int intel_gt_init_mmio(struct intel_gt *gt)
>  {
>  	intel_gt_init_clock_frequency(gt);
> @@ -96,11 +103,24 @@ int intel_gt_init_mmio(struct intel_gt *gt)
>  	intel_uc_init_mmio(&gt->uc);
>  	intel_sseu_info_init(gt);
>  
> -	if (GRAPHICS_VER(gt->i915) >= 11) {
> +	/*
> +	 * An mslice is unavailable only if both the meml3 for the
> slice is
> +	 * disabled *and* all of the DSS in the slice (quadrant) are
> disabled.
> +	 */
> +	if (HAS_MSLICES(gt->i915))
> +		gt->info.mslice_mask =
> +			slicemask(gt, GEN_DSS_PER_MSLICE) |
> +			(intel_uncore_read(gt->uncore,
> GEN10_MIRROR_FUSE3) &
> +			 GEN12_MEML3_EN_MASK);
> +
> +	if (GRAPHICS_VER(gt->i915) >= 11 &&
> +		   GRAPHICS_VER_FULL(gt->i915) < IP_VER(12, 50)) {
gt->i915 is referenced many times. It is better to define
i915 = gt->i915;

>  		gt->steering_table[L3BANK] = icl_l3bank_steering_table;
>  		gt->info.l3bank_mask =
>  			~intel_uncore_read(gt->uncore,
> GEN10_MIRROR_FUSE3) &
>  			GEN10_L3BANK_MASK;
> +	} else if (HAS_MSLICES(gt->i915)) {
> +		MISSING_CASE(INTEL_INFO(gt->i915)->platform);
>  	}
>  
>  	return intel_engines_init_mmio(gt);
> @@ -785,6 +805,24 @@ static void intel_gt_get_valid_steering(struct
> intel_gt *gt,
>  		*sliceid = 0;		/* unused */
>  		*subsliceid = __ffs(gt->info.l3bank_mask);
>  		break;
> +	case MSLICE:
> +		GEM_DEBUG_WARN_ON(!gt->info.mslice_mask); /* should be
> impossible! */
> +
> +		*sliceid = __ffs(gt->info.mslice_mask);
> +		*subsliceid = 0;	/* unused */
> +		break;
> +	case LNCF:
> +		GEM_DEBUG_WARN_ON(!gt->info.mslice_mask); /* should be
> impossible! */
> +
> +		/*
> +		 * 0xFDC[29:28] selects the mslice to steer to and
> 0xFDC[27]
> +		 * selects which LNCF within the mslice to steer
> to.  An LNCF
> +		 * is always present if its mslice is present, so we
> can safely
> +		 * just steer to LNCF 0 in all cases.
> +		 */
> +		*sliceid = __ffs(gt->info.mslice_mask) << 1;
> +		*subsliceid = 0;	/* unused */
> +		break;
>  	default:
>  		MISSING_CASE(type);
>  		*sliceid = 0;
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt.h
> b/drivers/gpu/drm/i915/gt/intel_gt.h
> index 74e771871a9b..24b78398a587 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gt.h
> @@ -84,6 +84,7 @@ static inline bool
> intel_gt_needs_read_steering(struct intel_gt *gt,
>  }
>  
>  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);
Shoulde this function declaration be included in this patch? I don't
find corresponding body in this patch.
-caz

>  
>  void intel_gt_info_print(const struct intel_gt_info *info,
>  			 struct drm_printer *p);
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_types.h
> b/drivers/gpu/drm/i915/gt/intel_gt_types.h
> index 97a5075288d2..a81e21bf1bd1 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt_types.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gt_types.h
> @@ -47,9 +47,14 @@ struct intel_mmio_range {
>   * of multicast registers.  If another type of steering does not
> have any
>   * overlap in valid steering targets with 'subslice' style
> registers, we will
>   * need to explicitly re-steer reads of registers of the other type.
> + *
> + * Only the replication types that may need additional non-default
> steering
> + * are listed here.
>   */
>  enum intel_steering_type {
>  	L3BANK,
> +	MSLICE,
> +	LNCF,
>  
>  	NUM_STEERING_TYPES
>  };
> @@ -184,6 +189,8 @@ struct intel_gt {
>  
>  		/* Slice/subslice/EU info */
>  		struct sseu_dev_info sseu;
> +
> +		unsigned long mslice_mask;
>  	} info;
>  };
>  
> diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.c
> b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
> index e3a2a2fa5f94..a74b72f50cc9 100644
> --- a/drivers/gpu/drm/i915/gt/intel_region_lmem.c
> +++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
> @@ -10,6 +10,7 @@
>  #include "gem/i915_gem_lmem.h"
>  #include "gem/i915_gem_region.h"
>  #include "gem/i915_gem_ttm.h"
> +#include "gt/intel_gt.h"
>  
>  static int init_fake_lmem_bar(struct intel_memory_region *mem)
>  {
> diff --git a/drivers/gpu/drm/i915/gt/intel_sseu.c
> b/drivers/gpu/drm/i915/gt/intel_sseu.c
> index 367fd44b81c8..bbed8e8625e1 100644
> --- a/drivers/gpu/drm/i915/gt/intel_sseu.c
> +++ b/drivers/gpu/drm/i915/gt/intel_sseu.c
> @@ -759,3 +759,21 @@ void intel_sseu_print_topology(const struct
> sseu_dev_info *sseu,
>  		}
>  	}
>  }
> +
> +u16 intel_slicemask_from_dssmask(u64 dss_mask, int dss_per_slice)
> +{
> +	u16 slice_mask = 0;
> +	int i;
> +
> +	WARN_ON(sizeof(dss_mask) * 8 / dss_per_slice > 8 *
> sizeof(slice_mask));
> +
> +	for (i = 0; dss_mask; i++) {
> +		if (dss_mask & GENMASK(dss_per_slice - 1, 0))
> +			slice_mask |= BIT(i);
> +
> +		dss_mask >>= dss_per_slice;
> +	}
> +
> +	return slice_mask;
> +}
> +
> diff --git a/drivers/gpu/drm/i915/gt/intel_sseu.h
> b/drivers/gpu/drm/i915/gt/intel_sseu.h
> index 4cd1a8a7298a..1073471d1980 100644
> --- a/drivers/gpu/drm/i915/gt/intel_sseu.h
> +++ b/drivers/gpu/drm/i915/gt/intel_sseu.h
> @@ -22,6 +22,10 @@ struct drm_printer;
>  #define GEN_MAX_EUS		(16) /* TGL upper bound */
>  #define GEN_MAX_EU_STRIDE GEN_SSEU_STRIDE(GEN_MAX_EUS)
>  
> +#define GEN_DSS_PER_GSLICE	4
> +#define GEN_DSS_PER_CSLICE	8
> +#define GEN_DSS_PER_MSLICE	8
> +
>  struct sseu_dev_info {
>  	u8 slice_mask;
>  	u8 subslice_mask[GEN_MAX_SLICES * GEN_MAX_SUBSLICE_STRIDE];
> @@ -104,4 +108,6 @@ void intel_sseu_dump(const struct sseu_dev_info
> *sseu, struct drm_printer *p);
>  void intel_sseu_print_topology(const struct sseu_dev_info *sseu,
>  			       struct drm_printer *p);
>  
> +u16 intel_slicemask_from_dssmask(u64 dss_mask, int dss_per_slice);
> +
>  #endif /* __INTEL_SSEU_H__ */
> diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> index 3aa5ce3cda8b..48f794f4a1af 100644
> --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> @@ -888,12 +888,24 @@ cfl_gt_workarounds_init(struct drm_i915_private
> *i915, struct i915_wa_list *wal)
>  		    GAMT_ECO_ENABLE_IN_PLACE_DECOMPRESS);
>  }
>  
> +static void __add_mcr_wa(struct drm_i915_private *i915, struct
> i915_wa_list *wal,
> +			 unsigned slice, unsigned subslice)
> +{
> +	u32 mcr, mcr_mask;
> +
> +	mcr = GEN11_MCR_SLICE(slice) | GEN11_MCR_SUBSLICE(subslice);
> +	mcr_mask = GEN11_MCR_SLICE_MASK | GEN11_MCR_SUBSLICE_MASK;
> +
> +	drm_dbg(&i915->drm, "MCR slice/subslice = %x\n", mcr);
> +
> +	wa_write_clr_set(wal, GEN8_MCR_SELECTOR, mcr_mask, mcr);
> +}
> +
>  static void
>  icl_wa_init_mcr(struct drm_i915_private *i915, struct i915_wa_list
> *wal)
>  {
>  	const struct sseu_dev_info *sseu = &i915->gt.info.sseu;
>  	unsigned int slice, subslice;
> -	u32 mcr, mcr_mask;
>  
>  	GEM_BUG_ON(GRAPHICS_VER(i915) < 11);
>  	GEM_BUG_ON(hweight8(sseu->slice_mask) > 1);
> @@ -918,12 +930,79 @@ icl_wa_init_mcr(struct drm_i915_private *i915,
> struct i915_wa_list *wal)
>  	if (i915->gt.info.l3bank_mask & BIT(subslice))
>  		i915->gt.steering_table[L3BANK] = NULL;
>  
> -	mcr = GEN11_MCR_SLICE(slice) | GEN11_MCR_SUBSLICE(subslice);
> -	mcr_mask = GEN11_MCR_SLICE_MASK | GEN11_MCR_SUBSLICE_MASK;
> +	__add_mcr_wa(i915, wal, slice, subslice);
> +}
>  
> -	drm_dbg(&i915->drm, "MCR slice/subslice = %x\n", mcr);
> +__maybe_unused
> +static void
> +xehp_init_mcr(struct intel_gt *gt, struct i915_wa_list *wal)
> +{
> +	struct drm_i915_private *i915 = gt->i915;
> +	const struct sseu_dev_info *sseu = &gt->info.sseu;
> +	unsigned long slice, subslice = 0, slice_mask = 0;
> +	u64 dss_mask = 0;
> +	u32 lncf_mask = 0;
> +	int i;
>  
> -	wa_write_clr_set(wal, GEN8_MCR_SELECTOR, mcr_mask, mcr);
> +	/*
> +	 * On Xe_HP the steering increases in complexity. There are now
> several
> +	 * more units that require steering and we're not guaranteed to
> be able
> +	 * to find a common setting for all of them. These are:
> +	 * - GSLICE (fusable)
> +	 * - DSS (sub-unit within gslice; fusable)
> +	 * - L3 Bank (fusable)
> +	 * - MSLICE (fusable)
> +	 * - LNCF (sub-unit within mslice; always present if mslice is
> present)
> +	 * - SQIDI (always on)
> +	 *
> +	 * We'll do our default/implicit steering based on GSLICE (in
> the
> +	 * sliceid field) and DSS (in the subsliceid field).  If we can
> +	 * find overlap between the valid MSLICE and/or LNCF values
> with
> +	 * a suitable GSLICE, then we can just re-use the default value
> and
> +	 * skip and explicit steering at runtime.
> +	 *
> +	 * We only need to look for overlap between GSLICE/MSLICE/LNCF
> to find
> +	 * a valid sliceid value.  DSS steering is the only type of
> steering
> +	 * that utilizes the 'subsliceid' bits.
> +	 *
> +	 * Also note that, even though the steering domain is called
> "GSlice"
> +	 * and it is encoded in the register using the gslice format,
> the spec
> +	 * says that the combined (geometry | compute) fuse should be
> used to
> +	 * select the steering.
> +	 */
> +
> +	/* Find the potential gslice candidates */
> +	dss_mask = intel_sseu_get_subslices(sseu, 0);
> +	slice_mask = intel_slicemask_from_dssmask(dss_mask,
> GEN_DSS_PER_GSLICE);
> +
> +	/*
> +	 * Find the potential LNCF candidates.  Either LNCF within a
> valid
> +	 * mslice is fine.
> +	 */
> +	for_each_set_bit(i, &gt->info.mslice_mask, GEN12_MAX_MSLICES)
> +		lncf_mask |= (0x3 << (i * 2));
> +
> +	/*
> +	 * Are there any sliceid values that work for both GSLICE and
> LNCF
> +	 * steering?
> +	 */
> +	if (slice_mask & lncf_mask) {
> +		slice_mask &= lncf_mask;
> +		gt->steering_table[LNCF] = NULL;
> +	}
> +
> +	/* How about sliceid values that also work for MSLICE steering?
> */
> +	if (slice_mask & gt->info.mslice_mask) {
> +		slice_mask &= gt->info.mslice_mask;
> +		gt->steering_table[MSLICE] = NULL;
> +	}
> +
> +	slice = __ffs(slice_mask);
> +	subslice = __ffs(dss_mask >> (slice * GEN_DSS_PER_GSLICE));
> +	WARN_ON(subslice > GEN_DSS_PER_GSLICE);
> +	WARN_ON(dss_mask >> (slice * GEN_DSS_PER_GSLICE) == 0);
> +
> +	__add_mcr_wa(i915, wal, slice, subslice);
>  }
>  
>  static void
> diff --git a/drivers/gpu/drm/i915/i915_drv.h
> b/drivers/gpu/drm/i915/i915_drv.h
> index d44d0050beec..e5b53e298e13 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1696,6 +1696,9 @@ IS_SUBPLATFORM(const struct drm_i915_private
> *i915,
>  #define HAS_RUNTIME_PM(dev_priv) (INTEL_INFO(dev_priv)-
> >has_runtime_pm)
>  #define HAS_64BIT_RELOC(dev_priv) (INTEL_INFO(dev_priv)-
> >has_64bit_reloc)
>  
> +#define HAS_MSLICES(dev_priv) \
> +	(INTEL_INFO(dev_priv)->has_mslices)
> +
>  #define HAS_IPC(dev_priv)		 (INTEL_INFO(dev_priv)-
> >display.has_ipc)
>  
>  #define HAS_REGION(i915, i) (INTEL_INFO(i915)->memory_regions & (i))
> diff --git a/drivers/gpu/drm/i915/i915_pci.c
> b/drivers/gpu/drm/i915/i915_pci.c
> index f28206484552..d0f18230dae8 100644
> --- a/drivers/gpu/drm/i915/i915_pci.c
> +++ b/drivers/gpu/drm/i915/i915_pci.c
> @@ -1012,6 +1012,7 @@ static const struct intel_device_info
> adl_p_info = {
>  	.has_llc = 1, \
>  	.has_logical_ring_contexts = 1, \
>  	.has_logical_ring_elsq = 1, \
> +	.has_mslices = 1, \
>  	.has_rc6 = 1, \
>  	.has_reset_engine = 1, \
>  	.has_rps = 1, \
> diff --git a/drivers/gpu/drm/i915/i915_reg.h
> b/drivers/gpu/drm/i915/i915_reg.h
> index 1669aa8e1cff..0009833fa033 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -2695,6 +2695,7 @@ static inline bool
> i915_mmio_reg_valid(i915_reg_t reg)
>  #define   GEN11_MCR_SLICE_MASK		GEN11_MCR_SLICE(0xf)
>  #define   GEN11_MCR_SUBSLICE(subslice)	(((subslice) & 0x7) <<
> 24)
>  #define   GEN11_MCR_SUBSLICE_MASK	GEN11_MCR_SUBSLICE(0x7)
> +#define   GEN11_MCR_MULTICAST		REG_BIT(31)
>  #define RING_IPEIR(base)	_MMIO((base) + 0x64)
>  #define RING_IPEHR(base)	_MMIO((base) + 0x68)
>  #define RING_EIR(base)		_MMIO((base) + 0xb0)
> @@ -3113,6 +3114,9 @@ static inline bool
> i915_mmio_reg_valid(i915_reg_t reg)
>  #define	GEN10_MIRROR_FUSE3		_MMIO(0x9118)
>  #define GEN10_L3BANK_PAIR_COUNT     4
>  #define GEN10_L3BANK_MASK   0x0F
> +/* on Xe_HP the same fuses indicates mslices instead of L3 banks */
> +#define GEN12_MAX_MSLICES 4
> +#define GEN12_MEML3_EN_MASK 0x0F
>  
>  #define GEN8_EU_DISABLE0		_MMIO(0x9134)
>  #define   GEN8_EU_DIS0_S0_MASK		0xffffff
> diff --git a/drivers/gpu/drm/i915/intel_device_info.h
> b/drivers/gpu/drm/i915/intel_device_info.h
> index 121d6d9afd3a..2177372f9ac3 100644
> --- a/drivers/gpu/drm/i915/intel_device_info.h
> +++ b/drivers/gpu/drm/i915/intel_device_info.h
> @@ -133,6 +133,7 @@ enum intel_ppgtt_type {
>  	func(has_llc); \
>  	func(has_logical_ring_contexts); \
>  	func(has_logical_ring_elsq); \
> +	func(has_mslices); \
>  	func(has_pooled_eu); \
>  	func(has_rc6); \
>  	func(has_rc6p); \
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