Re: [Intel-gfx] [PATCH 2/2] drm/i915/pvc: Add initial PVC workarounds

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On Fri, May 27, 2022 at 09:33:48AM -0700, Matt Roper wrote:
> From: Stuart Summers <stuart.summers@xxxxxxxxx>
> 
> Bspec: 64027
Reviewed-by: Matt Atwood <matthew.s.atwood@xxxxxxxxx>
> Signed-off-by: Stuart Summers <stuart.summers@xxxxxxxxx>
> Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/gt/intel_engine_regs.h |  5 +-
>  drivers/gpu/drm/i915/gt/intel_gt_regs.h     |  3 +-
>  drivers/gpu/drm/i915/gt/intel_workarounds.c | 61 ++++++++++++++++++---
>  drivers/gpu/drm/i915/intel_pm.c             | 16 +++++-
>  4 files changed, 73 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_engine_regs.h b/drivers/gpu/drm/i915/gt/intel_engine_regs.h
> index 75a0c55c5aa5..44de10cf7837 100644
> --- a/drivers/gpu/drm/i915/gt/intel_engine_regs.h
> +++ b/drivers/gpu/drm/i915/gt/intel_engine_regs.h
> @@ -196,6 +196,7 @@
>  #define RING_CTX_TIMESTAMP(base)		_MMIO((base) + 0x3a8) /* gen8+ */
>  #define RING_PREDICATE_RESULT(base)		_MMIO((base) + 0x3b8)
>  #define RING_FORCE_TO_NONPRIV(base, i)		_MMIO(((base) + 0x4D0) + (i) * 4)
> +#define   RING_FORCE_TO_NONPRIV_DENY		REG_BIT(30)
>  #define   RING_FORCE_TO_NONPRIV_ADDRESS_MASK	REG_GENMASK(25, 2)
>  #define   RING_FORCE_TO_NONPRIV_ACCESS_RW	(0 << 28)    /* CFL+ & Gen11+ */
>  #define   RING_FORCE_TO_NONPRIV_ACCESS_RD	(1 << 28)
> @@ -208,7 +209,9 @@
>  #define   RING_FORCE_TO_NONPRIV_RANGE_64	(3 << 0)
>  #define   RING_FORCE_TO_NONPRIV_RANGE_MASK	(3 << 0)
>  #define   RING_FORCE_TO_NONPRIV_MASK_VALID	\
> -	(RING_FORCE_TO_NONPRIV_RANGE_MASK | RING_FORCE_TO_NONPRIV_ACCESS_MASK)
> +	(RING_FORCE_TO_NONPRIV_RANGE_MASK | \
> +	 RING_FORCE_TO_NONPRIV_ACCESS_MASK | \
> +	 RING_FORCE_TO_NONPRIV_DENY)
>  #define   RING_MAX_NONPRIV_SLOTS  12
>  
>  #define RING_EXECLIST_SQ_CONTENTS(base)		_MMIO((base) + 0x510)
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> index b4642dcc192f..58e9b464d564 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> @@ -1070,8 +1070,9 @@
>  
>  #define GEN10_CACHE_MODE_SS			_MMIO(0xe420)
>  #define   ENABLE_EU_COUNT_FOR_TDL_FLUSH		REG_BIT(10)
> -#define   ENABLE_PREFETCH_INTO_IC		REG_BIT(3)
> +#define   DISABLE_ECC				REG_BIT(5)
>  #define   FLOAT_BLEND_OPTIMIZATION_ENABLE	REG_BIT(4)
> +#define   ENABLE_PREFETCH_INTO_IC		REG_BIT(3)
>  
>  #define EU_PERF_CNTL0				_MMIO(0xe458)
>  #define EU_PERF_CNTL4				_MMIO(0xe45c)
> diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> index 73b59ea6fd3b..a604bc7c0701 100644
> --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> @@ -776,7 +776,9 @@ __intel_engine_init_ctx_wa(struct intel_engine_cs *engine,
>  	if (engine->class != RENDER_CLASS)
>  		goto done;
>  
> -	if (IS_DG2(i915))
> +	if (IS_PONTEVECCHIO(i915))
> +		; /* noop; none at this time */
> +	else if (IS_DG2(i915))
>  		dg2_ctx_workarounds_init(engine, wal);
>  	else if (IS_XEHPSDV(i915))
>  		; /* noop; none at this time */
> @@ -1494,7 +1496,9 @@ gt_init_workarounds(struct intel_gt *gt, struct i915_wa_list *wal)
>  {
>  	struct drm_i915_private *i915 = gt->i915;
>  
> -	if (IS_DG2(i915))
> +	if (IS_PONTEVECCHIO(i915))
> +		; /* none yet */
> +	else if (IS_DG2(i915))
>  		dg2_gt_workarounds_init(gt, wal);
>  	else if (IS_XEHPSDV(i915))
>  		xehpsdv_gt_workarounds_init(gt, wal);
> @@ -1924,6 +1928,32 @@ static void dg2_whitelist_build(struct intel_engine_cs *engine)
>  	}
>  }
>  
> +static void blacklist_trtt(struct intel_engine_cs *engine)
> +{
> +	struct i915_wa_list *w = &engine->whitelist;
> +
> +	/*
> +	 * Prevent read/write access to [0x4400, 0x4600) which covers
> +	 * the TRTT range across all engines. Note that normally userspace
> +	 * cannot access the other engines' trtt control, but for simplicity
> +	 * we cover the entire range on each engine.
> +	 */
> +	whitelist_reg_ext(w, _MMIO(0x4400),
> +			  RING_FORCE_TO_NONPRIV_DENY |
> +			  RING_FORCE_TO_NONPRIV_RANGE_64);
> +	whitelist_reg_ext(w, _MMIO(0x4500),
> +			  RING_FORCE_TO_NONPRIV_DENY |
> +			  RING_FORCE_TO_NONPRIV_RANGE_64);
> +}
> +
> +static void pvc_whitelist_build(struct intel_engine_cs *engine)
> +{
> +	allow_read_ctx_timestamp(engine);
> +
> +	/* Wa_16014440446:pvc */
> +	blacklist_trtt(engine);
> +}
> +
>  void intel_engine_init_whitelist(struct intel_engine_cs *engine)
>  {
>  	struct drm_i915_private *i915 = engine->i915;
> @@ -1931,7 +1961,9 @@ void intel_engine_init_whitelist(struct intel_engine_cs *engine)
>  
>  	wa_init_start(w, "whitelist", engine->name);
>  
> -	if (IS_DG2(i915))
> +	if (IS_PONTEVECCHIO(i915))
> +		pvc_whitelist_build(engine);
> +	else if (IS_DG2(i915))
>  		dg2_whitelist_build(engine);
>  	else if (IS_XEHPSDV(i915))
>  		xehpsdv_whitelist_build(engine);
> @@ -2041,9 +2073,6 @@ rcs_engine_wa_init(struct intel_engine_cs *engine, struct i915_wa_list *wal)
>  	struct drm_i915_private *i915 = engine->i915;
>  
>  	if (IS_DG2(i915)) {
> -		/* Wa_14015227452:dg2 */
> -		wa_masked_en(wal, GEN9_ROW_CHICKEN4, XEHP_DIS_BBL_SYSPIPE);
> -
>  		/* Wa_1509235366:dg2 */
>  		wa_write_or(wal, GEN12_GAMCNTRL_CTRL, INVALIDATION_BROADCAST_MODE_DIS |
>  			    GLOBAL_INVALIDATION_MODE);
> @@ -2611,6 +2640,15 @@ xcs_engine_wa_init(struct intel_engine_cs *engine, struct i915_wa_list *wal)
>  	}
>  }
>  
> +static void
> +ccs_engine_wa_init(struct intel_engine_cs *engine, struct i915_wa_list *wal)
> +{
> +	if (IS_PVC_CT_STEP(engine->i915, STEP_A0, STEP_C0)) {
> +		/* Wa_14014999345:pvc */
> +		wa_masked_en(wal, GEN10_CACHE_MODE_SS, DISABLE_ECC);
> +	}
> +}
> +
>  /*
>   * The workarounds in this function apply to shared registers in
>   * the general render reset domain that aren't tied to a
> @@ -2657,8 +2695,11 @@ general_render_compute_wa_init(struct intel_engine_cs *engine, struct i915_wa_li
>  				GLOBAL_INVALIDATION_MODE);
>  	}
>  
> -	if (IS_DG2(i915)) {
> -		/* Wa_22014226127:dg2 */
> +	if (IS_DG2(i915) || IS_PONTEVECCHIO(i915)) {
> +		/* Wa_14015227452:dg2,pvc */
> +		wa_masked_en(wal, GEN9_ROW_CHICKEN4, XEHP_DIS_BBL_SYSPIPE);
> +
> +		/* Wa_22014226127:dg2,pvc */
>  		wa_write_or(wal, LSC_CHICKEN_BIT_0, DISABLE_D8_D16_COASLESCE);
>  	}
>  }
> @@ -2679,7 +2720,9 @@ engine_init_workarounds(struct intel_engine_cs *engine, struct i915_wa_list *wal
>  	if (engine->flags & I915_ENGINE_FIRST_RENDER_COMPUTE)
>  		general_render_compute_wa_init(engine, wal);
>  
> -	if (engine->class == RENDER_CLASS)
> +	if (engine->class == COMPUTE_CLASS)
> +		ccs_engine_wa_init(engine, wal);
> +	else if (engine->class == RENDER_CLASS)
>  		rcs_engine_wa_init(engine, wal);
>  	else
>  		xcs_engine_wa_init(engine, wal);
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 42db41c8e3b3..7a3f023d39e9 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -7526,6 +7526,17 @@ static void dg2_init_clock_gating(struct drm_i915_private *i915)
>  				 SGR_DIS | SGGI_DIS);
>  }
>  
> +static void pvc_init_clock_gating(struct drm_i915_private *dev_priv)
> +{
> +	/* Wa_14012385139:pvc */
> +	if (IS_PVC_BD_STEP(dev_priv, STEP_A0, STEP_B0))
> +		intel_uncore_rmw(&dev_priv->uncore, XEHP_CLOCK_GATE_DIS, 0, SGR_DIS);
> +
> +	/* Wa_22010954014:pvc */
> +	if (IS_PVC_BD_STEP(dev_priv, STEP_A0, STEP_B0))
> +		intel_uncore_rmw(&dev_priv->uncore, XEHP_CLOCK_GATE_DIS, 0, SGSI_SIDECLK_DIS);
> +}
> +
>  static void cnp_init_clock_gating(struct drm_i915_private *dev_priv)
>  {
>  	if (!HAS_PCH_CNP(dev_priv))
> @@ -7942,6 +7953,7 @@ static const struct drm_i915_clock_gating_funcs platform##_clock_gating_funcs =
>  	.init_clock_gating = platform##_init_clock_gating,		\
>  }
>  
> +CG_FUNCS(pvc);
>  CG_FUNCS(dg2);
>  CG_FUNCS(xehpsdv);
>  CG_FUNCS(adlp);
> @@ -7980,7 +7992,9 @@ CG_FUNCS(nop);
>   */
>  void intel_init_clock_gating_hooks(struct drm_i915_private *dev_priv)
>  {
> -	if (IS_DG2(dev_priv))
> +	if (IS_PONTEVECCHIO(dev_priv))
> +		dev_priv->clock_gating_funcs = &pvc_clock_gating_funcs;
> +	else if (IS_DG2(dev_priv))
>  		dev_priv->clock_gating_funcs = &dg2_clock_gating_funcs;
>  	else if (IS_XEHPSDV(dev_priv))
>  		dev_priv->clock_gating_funcs = &xehpsdv_clock_gating_funcs;
> -- 
> 2.35.3
> 



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