Re: [PATCH v8] drm/i915/dsb: Pre allocate and late cleanup of cmd buffer

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Op 14-05-2020 om 16:58 schreef Animesh Manna:
> Pre-allocate command buffer in atomic_commit using intel_dsb_prepare
> function which also includes pinning and map in cpu domain.
>
> No functional change is dsb write/commit functions.
>
> Now dsb get/put function is removed and ref-count mechanism is
> not needed. Below dsb api added to do respective job mentioned
> below.
>
> intel_dsb_prepare - Allocate, pin and map the buffer.
> intel_dsb_cleanup - Unpin and release the gem object.
>
> RFC: Initial patch for design review.
> v2: included _init() part in _prepare(). [Daniel, Ville]
> v3: dsb_cleanup called after cleanup_planes. [Daniel]
> v4: dsb structure is moved to intel_crtc_state from intel_crtc. [Maarten]
> v5: dsb get/put/ref-count mechanism removed. [Maarten]
> v6: Based on review feedback following changes are added,
> - replaced intel_dsb structure by pointer in intel_crtc_state. [Maarten]
> - passing intel_crtc_state to dsp-api to simplify the code. [Maarten]
> - few dsb functions prototype modified to simplify code.
> v7: added few cosmetic changes suggested by Jani and null check for
> crtc_state in dsb_cleanup removed as suggested by Maarten.
> v8: changed the function parameter to intel_crtc_state* of
> ivb_load_lut_ext_max() from intel_crtc. [Maarten]
>
> Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Acked-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Signed-off-by: Animesh Manna <animesh.manna@xxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/display/intel_atomic.c   |   3 +
>  drivers/gpu/drm/i915/display/intel_color.c    |  66 ++---
>  drivers/gpu/drm/i915/display/intel_display.c  |  58 ++++-
>  .../drm/i915/display/intel_display_types.h    |   6 +-
>  drivers/gpu/drm/i915/display/intel_dsb.c      | 246 ++++++++----------
>  drivers/gpu/drm/i915/display/intel_dsb.h      |  17 +-
>  6 files changed, 202 insertions(+), 194 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c b/drivers/gpu/drm/i915/display/intel_atomic.c
> index d043057d2fa0..3cb866f22e74 100644
> --- a/drivers/gpu/drm/i915/display/intel_atomic.c
> +++ b/drivers/gpu/drm/i915/display/intel_atomic.c
> @@ -252,6 +252,7 @@ intel_crtc_duplicate_state(struct drm_crtc *crtc)
>  	crtc_state->wm.need_postvbl_update = false;
>  	crtc_state->fb_bits = 0;
>  	crtc_state->update_planes = 0;
> +	crtc_state->dsb = NULL;
>  
>  	return &crtc_state->uapi;
>  }
> @@ -292,6 +293,8 @@ intel_crtc_destroy_state(struct drm_crtc *crtc,
>  {
>  	struct intel_crtc_state *crtc_state = to_intel_crtc_state(state);
>  
> +	drm_WARN_ON(crtc->dev, crtc_state->dsb);
> +
>  	__drm_atomic_helper_crtc_destroy_state(&crtc_state->uapi);
>  	intel_crtc_free_hw_state(crtc_state);
>  	kfree(crtc_state);
> diff --git a/drivers/gpu/drm/i915/display/intel_color.c b/drivers/gpu/drm/i915/display/intel_color.c
> index 98ece9cd7cdd..945bb03bdd4d 100644
> --- a/drivers/gpu/drm/i915/display/intel_color.c
> +++ b/drivers/gpu/drm/i915/display/intel_color.c
> @@ -714,16 +714,16 @@ static void bdw_load_lut_10(struct intel_crtc *crtc,
>  	intel_de_write(dev_priv, PREC_PAL_INDEX(pipe), 0);
>  }
>  
> -static void ivb_load_lut_ext_max(struct intel_crtc *crtc)
> +static void ivb_load_lut_ext_max(const struct intel_crtc_state *crtc_state)
>  {
> +	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
>  	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> -	struct intel_dsb *dsb = intel_dsb_get(crtc);
>  	enum pipe pipe = crtc->pipe;
>  
>  	/* Program the max register to clamp values > 1.0. */
> -	intel_dsb_reg_write(dsb, PREC_PAL_EXT_GC_MAX(pipe, 0), 1 << 16);
> -	intel_dsb_reg_write(dsb, PREC_PAL_EXT_GC_MAX(pipe, 1), 1 << 16);
> -	intel_dsb_reg_write(dsb, PREC_PAL_EXT_GC_MAX(pipe, 2), 1 << 16);
> +	intel_dsb_reg_write(crtc_state, PREC_PAL_EXT_GC_MAX(pipe, 0), 1 << 16);
> +	intel_dsb_reg_write(crtc_state, PREC_PAL_EXT_GC_MAX(pipe, 1), 1 << 16);
> +	intel_dsb_reg_write(crtc_state, PREC_PAL_EXT_GC_MAX(pipe, 2), 1 << 16);
>  
>  	/*
>  	 * Program the gc max 2 register to clamp values > 1.0.
> @@ -731,15 +731,13 @@ static void ivb_load_lut_ext_max(struct intel_crtc *crtc)
>  	 * from 3.0 to 7.0
>  	 */
>  	if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv)) {
> -		intel_dsb_reg_write(dsb, PREC_PAL_EXT2_GC_MAX(pipe, 0),
> +		intel_dsb_reg_write(crtc_state, PREC_PAL_EXT2_GC_MAX(pipe, 0),
>  				    1 << 16);
> -		intel_dsb_reg_write(dsb, PREC_PAL_EXT2_GC_MAX(pipe, 1),
> +		intel_dsb_reg_write(crtc_state, PREC_PAL_EXT2_GC_MAX(pipe, 1),
>  				    1 << 16);
> -		intel_dsb_reg_write(dsb, PREC_PAL_EXT2_GC_MAX(pipe, 2),
> +		intel_dsb_reg_write(crtc_state, PREC_PAL_EXT2_GC_MAX(pipe, 2),
>  				    1 << 16);
>  	}
> -
> -	intel_dsb_put(dsb);
>  }
>  
>  static void ivb_load_luts(const struct intel_crtc_state *crtc_state)
> @@ -753,7 +751,7 @@ static void ivb_load_luts(const struct intel_crtc_state *crtc_state)
>  	} else if (crtc_state->gamma_mode == GAMMA_MODE_MODE_SPLIT) {
>  		ivb_load_lut_10(crtc, degamma_lut, PAL_PREC_SPLIT_MODE |
>  				PAL_PREC_INDEX_VALUE(0));
> -		ivb_load_lut_ext_max(crtc);
> +		ivb_load_lut_ext_max(crtc_state);
>  		ivb_load_lut_10(crtc, gamma_lut, PAL_PREC_SPLIT_MODE |
>  				PAL_PREC_INDEX_VALUE(512));
>  	} else {
> @@ -761,7 +759,7 @@ static void ivb_load_luts(const struct intel_crtc_state *crtc_state)
>  
>  		ivb_load_lut_10(crtc, blob,
>  				PAL_PREC_INDEX_VALUE(0));
> -		ivb_load_lut_ext_max(crtc);
> +		ivb_load_lut_ext_max(crtc_state);
>  	}
>  }
>  
> @@ -776,7 +774,7 @@ static void bdw_load_luts(const struct intel_crtc_state *crtc_state)
>  	} else if (crtc_state->gamma_mode == GAMMA_MODE_MODE_SPLIT) {
>  		bdw_load_lut_10(crtc, degamma_lut, PAL_PREC_SPLIT_MODE |
>  				PAL_PREC_INDEX_VALUE(0));
> -		ivb_load_lut_ext_max(crtc);
> +		ivb_load_lut_ext_max(crtc_state);
>  		bdw_load_lut_10(crtc, gamma_lut, PAL_PREC_SPLIT_MODE |
>  				PAL_PREC_INDEX_VALUE(512));
>  	} else {
> @@ -784,7 +782,7 @@ static void bdw_load_luts(const struct intel_crtc_state *crtc_state)
>  
>  		bdw_load_lut_10(crtc, blob,
>  				PAL_PREC_INDEX_VALUE(0));
> -		ivb_load_lut_ext_max(crtc);
> +		ivb_load_lut_ext_max(crtc_state);
>  	}
>  }
>  
> @@ -877,7 +875,7 @@ static void glk_load_luts(const struct intel_crtc_state *crtc_state)
>  		ilk_load_lut_8(crtc, gamma_lut);
>  	} else {
>  		bdw_load_lut_10(crtc, gamma_lut, PAL_PREC_INDEX_VALUE(0));
> -		ivb_load_lut_ext_max(crtc);
> +		ivb_load_lut_ext_max(crtc_state);
>  	}
>  }
>  
> @@ -900,14 +898,12 @@ icl_load_gcmax(const struct intel_crtc_state *crtc_state,
>  	       const struct drm_color_lut *color)
>  {
>  	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
> -	struct intel_dsb *dsb = intel_dsb_get(crtc);
>  	enum pipe pipe = crtc->pipe;
>  
>  	/* FIXME LUT entries are 16 bit only, so we can prog 0xFFFF max */
> -	intel_dsb_reg_write(dsb, PREC_PAL_GC_MAX(pipe, 0), color->red);
> -	intel_dsb_reg_write(dsb, PREC_PAL_GC_MAX(pipe, 1), color->green);
> -	intel_dsb_reg_write(dsb, PREC_PAL_GC_MAX(pipe, 2), color->blue);
> -	intel_dsb_put(dsb);
> +	intel_dsb_reg_write(crtc_state, PREC_PAL_GC_MAX(pipe, 0), color->red);
> +	intel_dsb_reg_write(crtc_state, PREC_PAL_GC_MAX(pipe, 1), color->green);
> +	intel_dsb_reg_write(crtc_state, PREC_PAL_GC_MAX(pipe, 2), color->blue);
>  }
>  
>  static void
> @@ -916,7 +912,6 @@ icl_program_gamma_superfine_segment(const struct intel_crtc_state *crtc_state)
>  	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
>  	const struct drm_property_blob *blob = crtc_state->hw.gamma_lut;
>  	const struct drm_color_lut *lut = blob->data;
> -	struct intel_dsb *dsb = intel_dsb_get(crtc);
>  	enum pipe pipe = crtc->pipe;
>  	int i;
>  
> @@ -927,19 +922,17 @@ icl_program_gamma_superfine_segment(const struct intel_crtc_state *crtc_state)
>  	 * 9 entries, corresponding to values 0, 1/(8 * 128 * 256),
>  	 * 2/(8 * 128 * 256) ... 8/(8 * 128 * 256).
>  	 */
> -	intel_dsb_reg_write(dsb, PREC_PAL_MULTI_SEG_INDEX(pipe),
> +	intel_dsb_reg_write(crtc_state, PREC_PAL_MULTI_SEG_INDEX(pipe),
>  			    PAL_PREC_AUTO_INCREMENT);
>  
>  	for (i = 0; i < 9; i++) {
>  		const struct drm_color_lut *entry = &lut[i];
>  
> -		intel_dsb_indexed_reg_write(dsb, PREC_PAL_MULTI_SEG_DATA(pipe),
> +		intel_dsb_indexed_reg_write(crtc_state, PREC_PAL_MULTI_SEG_DATA(pipe),
>  					    ilk_lut_12p4_ldw(entry));
> -		intel_dsb_indexed_reg_write(dsb, PREC_PAL_MULTI_SEG_DATA(pipe),
> +		intel_dsb_indexed_reg_write(crtc_state, PREC_PAL_MULTI_SEG_DATA(pipe),
>  					    ilk_lut_12p4_udw(entry));
>  	}
> -
> -	intel_dsb_put(dsb);
>  }
>  
>  static void
> @@ -949,7 +942,6 @@ icl_program_gamma_multi_segment(const struct intel_crtc_state *crtc_state)
>  	const struct drm_property_blob *blob = crtc_state->hw.gamma_lut;
>  	const struct drm_color_lut *lut = blob->data;
>  	const struct drm_color_lut *entry;
> -	struct intel_dsb *dsb = intel_dsb_get(crtc);
>  	enum pipe pipe = crtc->pipe;
>  	int i;
>  
> @@ -963,12 +955,13 @@ icl_program_gamma_multi_segment(const struct intel_crtc_state *crtc_state)
>  	 * PAL_PREC_INDEX[0] and PAL_PREC_INDEX[1] map to seg2[1],
>  	 * seg2[0] being unused by the hardware.
>  	 */
> -	intel_dsb_reg_write(dsb, PREC_PAL_INDEX(pipe), PAL_PREC_AUTO_INCREMENT);
> +	intel_dsb_reg_write(crtc_state, PREC_PAL_INDEX(pipe),
> +			    PAL_PREC_AUTO_INCREMENT);
>  	for (i = 1; i < 257; i++) {
>  		entry = &lut[i * 8];
> -		intel_dsb_indexed_reg_write(dsb, PREC_PAL_DATA(pipe),
> +		intel_dsb_indexed_reg_write(crtc_state, PREC_PAL_DATA(pipe),
>  					    ilk_lut_12p4_ldw(entry));
> -		intel_dsb_indexed_reg_write(dsb, PREC_PAL_DATA(pipe),
> +		intel_dsb_indexed_reg_write(crtc_state, PREC_PAL_DATA(pipe),
>  					    ilk_lut_12p4_udw(entry));
>  	}
>  
> @@ -986,24 +979,22 @@ icl_program_gamma_multi_segment(const struct intel_crtc_state *crtc_state)
>  	 */
>  	for (i = 0; i < 256; i++) {
>  		entry = &lut[i * 8 * 128];
> -		intel_dsb_indexed_reg_write(dsb, PREC_PAL_DATA(pipe),
> +		intel_dsb_indexed_reg_write(crtc_state, PREC_PAL_DATA(pipe),
>  					    ilk_lut_12p4_ldw(entry));
> -		intel_dsb_indexed_reg_write(dsb, PREC_PAL_DATA(pipe),
> +		intel_dsb_indexed_reg_write(crtc_state, PREC_PAL_DATA(pipe),
>  					    ilk_lut_12p4_udw(entry));
>  	}
>  
>  	/* The last entry in the LUT is to be programmed in GCMAX */
>  	entry = &lut[256 * 8 * 128];
>  	icl_load_gcmax(crtc_state, entry);
> -	ivb_load_lut_ext_max(crtc);
> -	intel_dsb_put(dsb);
> +	ivb_load_lut_ext_max(crtc_state);
>  }
>  
>  static void icl_load_luts(const struct intel_crtc_state *crtc_state)
>  {
>  	const struct drm_property_blob *gamma_lut = crtc_state->hw.gamma_lut;
>  	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
> -	struct intel_dsb *dsb = intel_dsb_get(crtc);
>  
>  	if (crtc_state->hw.degamma_lut)
>  		glk_load_degamma_lut(crtc_state);
> @@ -1018,11 +1009,10 @@ static void icl_load_luts(const struct intel_crtc_state *crtc_state)
>  		break;
>  	default:
>  		bdw_load_lut_10(crtc, gamma_lut, PAL_PREC_INDEX_VALUE(0));
> -		ivb_load_lut_ext_max(crtc);
> +		ivb_load_lut_ext_max(crtc_state);
>  	}
>  
> -	intel_dsb_commit(dsb);
> -	intel_dsb_put(dsb);
> +	intel_dsb_commit(crtc_state);
>  }
>  
>  static u32 chv_cgm_degamma_ldw(const struct drm_color_lut *color)
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 432b4eeaf9f6..514483ffd247 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -14873,8 +14873,24 @@ static int intel_atomic_check(struct drm_device *dev,
>  
>  static int intel_atomic_prepare_commit(struct intel_atomic_state *state)
>  {
> -	return drm_atomic_helper_prepare_planes(state->base.dev,
> -						&state->base);
> +	struct intel_crtc_state *crtc_state;
> +	struct intel_crtc *crtc;
> +	int i, ret;
> +
> +	ret = drm_atomic_helper_prepare_planes(state->base.dev, &state->base);
> +	if (ret < 0)
> +		return ret;
> +
> +	for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
> +		bool mode_changed = needs_modeset(crtc_state);
> +
> +		if (mode_changed || crtc_state->update_pipe ||
> +		    crtc_state->uapi.color_mgmt_changed) {
> +			intel_dsb_prepare(crtc_state);
> +		}
> +	}
> +
> +	return 0;
>  }
>  
>  u32 intel_crtc_get_vblank_counter(struct intel_crtc *crtc)
> @@ -15327,15 +15343,27 @@ static void intel_atomic_commit_fence_wait(struct intel_atomic_state *intel_stat
>  		    &wait_reset);
>  }
>  
> +static void intel_cleanup_dsbs(struct intel_atomic_state *state)
> +{
> +	struct intel_crtc_state *old_crtc_state, *new_crtc_state;
> +	struct intel_crtc *crtc;
> +	int i;
> +
> +	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
> +					    new_crtc_state, i)
> +		intel_dsb_cleanup(old_crtc_state);
> +}
> +
>  static void intel_atomic_cleanup_work(struct work_struct *work)
>  {
> -	struct drm_atomic_state *state =
> -		container_of(work, struct drm_atomic_state, commit_work);
> -	struct drm_i915_private *i915 = to_i915(state->dev);
> +	struct intel_atomic_state *state =
> +		container_of(work, struct intel_atomic_state, base.commit_work);
> +	struct drm_i915_private *i915 = to_i915(state->base.dev);
>  
> -	drm_atomic_helper_cleanup_planes(&i915->drm, state);
> -	drm_atomic_helper_commit_cleanup_done(state);
> -	drm_atomic_state_put(state);
> +	intel_cleanup_dsbs(state);
> +	drm_atomic_helper_cleanup_planes(&i915->drm, &state->base);
> +	drm_atomic_helper_commit_cleanup_done(&state->base);
> +	drm_atomic_state_put(&state->base);
>  
>  	intel_atomic_helper_free_state(i915);
>  }
> @@ -15469,6 +15497,13 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
>  			modeset_put_power_domains(dev_priv, put_domains[i]);
>  
>  		intel_modeset_verify_crtc(crtc, state, old_crtc_state, new_crtc_state);
> +
> +		/*
> +		 * DSB cleanup is done in cleanup_work aligning with framebuffer
> +		 * cleanup. So copy and reset the dsb structure to sync with
> +		 * commit_done and later do dsb cleanup in cleanup_work.
> +		 */
> +		old_crtc_state->dsb = fetch_and_zero(&new_crtc_state->dsb);
>  	}
>  
>  	/* Underruns don't always raise interrupts, so check manually */
> @@ -15618,8 +15653,15 @@ static int intel_atomic_commit(struct drm_device *dev,
>  		intel_atomic_swap_global_state(state);
>  
>  	if (ret) {
> +		struct intel_crtc_state *new_crtc_state;
> +		struct intel_crtc *crtc;
> +		int i;
> +
>  		i915_sw_fence_commit(&state->commit_ready);
>  
> +		for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i)
> +			intel_dsb_cleanup(new_crtc_state);
> +
>  		drm_atomic_helper_cleanup_planes(dev, &state->base);
>  		intel_runtime_pm_put(&dev_priv->runtime_pm, state->wakeref);
>  		return ret;
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> index 87876fce91a5..ca579005d818 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -1078,6 +1078,9 @@ struct intel_crtc_state {
>  
>  	/* Only valid on TGL+ */
>  	enum transcoder mst_master_transcoder;
> +
> +	/* For DSB related info */
> +	struct intel_dsb *dsb;
>  };
>  
>  enum intel_pipe_crc_source {
> @@ -1147,9 +1150,6 @@ struct intel_crtc {
>  	/* scalers available on this crtc */
>  	int num_scalers;
>  
> -	/* per pipe DSB related info */
> -	struct intel_dsb dsb;
> -
>  #ifdef CONFIG_DEBUG_FS
>  	struct intel_pipe_crc pipe_crc;
>  #endif
> diff --git a/drivers/gpu/drm/i915/display/intel_dsb.c b/drivers/gpu/drm/i915/display/intel_dsb.c
> index 29fec6a92d17..0642428176bb 100644
> --- a/drivers/gpu/drm/i915/display/intel_dsb.c
> +++ b/drivers/gpu/drm/i915/display/intel_dsb.c
> @@ -34,152 +34,52 @@
>  #define DSB_BYTE_EN_SHIFT		20
>  #define DSB_REG_VALUE_MASK		0xfffff
>  
> -static bool is_dsb_busy(struct intel_dsb *dsb)
> +static bool is_dsb_busy(struct drm_i915_private *i915, enum pipe pipe,
> +			enum dsb_id id)
>  {
> -	struct intel_crtc *crtc = container_of(dsb, typeof(*crtc), dsb);
> -	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> -	enum pipe pipe = crtc->pipe;
> -
> -	return DSB_STATUS & intel_de_read(dev_priv, DSB_CTRL(pipe, dsb->id));
> +	return DSB_STATUS & intel_de_read(i915, DSB_CTRL(pipe, id));
>  }
>  
> -static bool intel_dsb_enable_engine(struct intel_dsb *dsb)
> +static bool intel_dsb_enable_engine(struct drm_i915_private *i915,
> +				    enum pipe pipe, enum dsb_id id)
>  {
> -	struct intel_crtc *crtc = container_of(dsb, typeof(*crtc), dsb);
> -	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> -	enum pipe pipe = crtc->pipe;
>  	u32 dsb_ctrl;
>  
> -	dsb_ctrl = intel_de_read(dev_priv, DSB_CTRL(pipe, dsb->id));
> +	dsb_ctrl = intel_de_read(i915, DSB_CTRL(pipe, id));
>  	if (DSB_STATUS & dsb_ctrl) {
> -		drm_dbg_kms(&dev_priv->drm, "DSB engine is busy.\n");
> +		drm_dbg_kms(&i915->drm, "DSB engine is busy.\n");
>  		return false;
>  	}
>  
>  	dsb_ctrl |= DSB_ENABLE;
> -	intel_de_write(dev_priv, DSB_CTRL(pipe, dsb->id), dsb_ctrl);
> +	intel_de_write(i915, DSB_CTRL(pipe, id), dsb_ctrl);
>  
> -	intel_de_posting_read(dev_priv, DSB_CTRL(pipe, dsb->id));
> +	intel_de_posting_read(i915, DSB_CTRL(pipe, id));
>  	return true;
>  }
>  
> -static bool intel_dsb_disable_engine(struct intel_dsb *dsb)
> +static bool intel_dsb_disable_engine(struct drm_i915_private *i915,
> +				     enum pipe pipe, enum dsb_id id)
>  {
> -	struct intel_crtc *crtc = container_of(dsb, typeof(*crtc), dsb);
> -	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> -	enum pipe pipe = crtc->pipe;
>  	u32 dsb_ctrl;
>  
> -	dsb_ctrl = intel_de_read(dev_priv, DSB_CTRL(pipe, dsb->id));
> +	dsb_ctrl = intel_de_read(i915, DSB_CTRL(pipe, id));
>  	if (DSB_STATUS & dsb_ctrl) {
> -		drm_dbg_kms(&dev_priv->drm, "DSB engine is busy.\n");
> +		drm_dbg_kms(&i915->drm, "DSB engine is busy.\n");
>  		return false;
>  	}
>  
>  	dsb_ctrl &= ~DSB_ENABLE;
> -	intel_de_write(dev_priv, DSB_CTRL(pipe, dsb->id), dsb_ctrl);
> +	intel_de_write(i915, DSB_CTRL(pipe, id), dsb_ctrl);
>  
> -	intel_de_posting_read(dev_priv, DSB_CTRL(pipe, dsb->id));
> +	intel_de_posting_read(i915, DSB_CTRL(pipe, id));
>  	return true;
>  }
>  
> -/**
> - * intel_dsb_get() - Allocate DSB context and return a DSB instance.
> - * @crtc: intel_crtc structure to get pipe info.
> - *
> - * This function provides handle of a DSB instance, for the further DSB
> - * operations.
> - *
> - * Returns: address of Intel_dsb instance requested for.
> - * Failure: Returns the same DSB instance, but without a command buffer.
> - */
> -
> -struct intel_dsb *
> -intel_dsb_get(struct intel_crtc *crtc)
> -{
> -	struct drm_device *dev = crtc->base.dev;
> -	struct drm_i915_private *i915 = to_i915(dev);
> -	struct intel_dsb *dsb = &crtc->dsb;
> -	struct drm_i915_gem_object *obj;
> -	struct i915_vma *vma;
> -	u32 *buf;
> -	intel_wakeref_t wakeref;
> -
> -	if (!HAS_DSB(i915))
> -		return dsb;
> -
> -	if (dsb->refcount++ != 0)
> -		return dsb;
> -
> -	wakeref = intel_runtime_pm_get(&i915->runtime_pm);
> -
> -	obj = i915_gem_object_create_internal(i915, DSB_BUF_SIZE);
> -	if (IS_ERR(obj)) {
> -		drm_err(&i915->drm, "Gem object creation failed\n");
> -		goto out;
> -	}
> -
> -	vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
> -	if (IS_ERR(vma)) {
> -		drm_err(&i915->drm, "Vma creation failed\n");
> -		i915_gem_object_put(obj);
> -		goto out;
> -	}
> -
> -	buf = i915_gem_object_pin_map(vma->obj, I915_MAP_WC);
> -	if (IS_ERR(buf)) {
> -		drm_err(&i915->drm, "Command buffer creation failed\n");
> -		goto out;
> -	}
> -
> -	dsb->id = DSB1;
> -	dsb->vma = vma;
> -	dsb->cmd_buf = buf;
> -
> -out:
> -	/*
> -	 * On error dsb->cmd_buf will continue to be NULL, making the writes
> -	 * pass-through. Leave the dangling ref to be removed later by the
> -	 * corresponding intel_dsb_put(): the important error message will
> -	 * already be logged above.
> -	 */
> -
> -	intel_runtime_pm_put(&i915->runtime_pm, wakeref);
> -
> -	return dsb;
> -}
> -
> -/**
> - * intel_dsb_put() - To destroy DSB context.
> - * @dsb: intel_dsb structure.
> - *
> - * This function destroys the DSB context allocated by a dsb_get(), by
> - * unpinning and releasing the VMA object associated with it.
> - */
> -
> -void intel_dsb_put(struct intel_dsb *dsb)
> -{
> -	struct intel_crtc *crtc = container_of(dsb, typeof(*crtc), dsb);
> -	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
> -
> -	if (!HAS_DSB(i915))
> -		return;
> -
> -	if (drm_WARN_ON(&i915->drm, dsb->refcount == 0))
> -		return;
> -
> -	if (--dsb->refcount == 0) {
> -		i915_vma_unpin_and_release(&dsb->vma, I915_VMA_RELEASE_MAP);
> -		dsb->cmd_buf = NULL;
> -		dsb->free_pos = 0;
> -		dsb->ins_start_offset = 0;
> -	}
> -}
> -
>  /**
>   * intel_dsb_indexed_reg_write() -Write to the DSB context for auto
>   * increment register.
> - * @dsb: intel_dsb structure.
> + * @crtc_state: intel_crtc_state structure
>   * @reg: register address.
>   * @val: value.
>   *
> @@ -189,19 +89,20 @@ void intel_dsb_put(struct intel_dsb *dsb)
>   * is done through mmio write.
>   */
>  
> -void intel_dsb_indexed_reg_write(struct intel_dsb *dsb, i915_reg_t reg,
> -				 u32 val)
> +void intel_dsb_indexed_reg_write(const struct intel_crtc_state *crtc_state,
> +				 i915_reg_t reg, u32 val)
>  {
> -	struct intel_crtc *crtc = container_of(dsb, typeof(*crtc), dsb);
> +	struct intel_dsb *dsb = crtc_state->dsb;
> +	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
>  	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> -	u32 *buf = dsb->cmd_buf;
> +	u32 *buf;
>  	u32 reg_val;
>  
> -	if (!buf) {
> +	if (!(dsb && dsb->cmd_buf)) {
Same as below.
>  		intel_de_write(dev_priv, reg, val);
>  		return;
>  	}
> -
> +	buf = dsb->cmd_buf;
>  	if (drm_WARN_ON(&dev_priv->drm, dsb->free_pos >= DSB_BUF_SIZE)) {
>  		drm_dbg_kms(&dev_priv->drm, "DSB buffer overflow\n");
>  		return;
> @@ -256,7 +157,7 @@ void intel_dsb_indexed_reg_write(struct intel_dsb *dsb, i915_reg_t reg,
>  /**
>   * intel_dsb_reg_write() -Write to the DSB context for normal
>   * register.
> - * @dsb: intel_dsb structure.
> + * @crtc_state: intel_crtc_state structure
>   * @reg: register address.
>   * @val: value.
>   *
> @@ -265,17 +166,19 @@ void intel_dsb_indexed_reg_write(struct intel_dsb *dsb, i915_reg_t reg,
>   * and rest all erroneous condition register programming is done
>   * through mmio write.
>   */
> -void intel_dsb_reg_write(struct intel_dsb *dsb, i915_reg_t reg, u32 val)
> +void intel_dsb_reg_write(const struct intel_crtc_state *crtc_state,
> +			 i915_reg_t reg, u32 val)
>  {
> -	struct intel_crtc *crtc = container_of(dsb, typeof(*crtc), dsb);
> +	struct intel_dsb *dsb = crtc_state->dsb;
> +	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
>  	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
>  	u32 *buf = dsb->cmd_buf;
>  
> -	if (!buf) {
> +	if (!(dsb && dsb->cmd_buf)) {
if (!dsb) should be enough with proper error handling. :)
>  		intel_de_write(dev_priv, reg, val);
>  		return;
>  	}
> -
> +	buf = dsb->cmd_buf;
>  	if (drm_WARN_ON(&dev_priv->drm, dsb->free_pos >= DSB_BUF_SIZE)) {
>  		drm_dbg_kms(&dev_priv->drm, "DSB buffer overflow\n");
>  		return;
> @@ -290,26 +193,27 @@ void intel_dsb_reg_write(struct intel_dsb *dsb, i915_reg_t reg, u32 val)
>  
>  /**
>   * intel_dsb_commit() - Trigger workload execution of DSB.
> - * @dsb: intel_dsb structure.
> + * @crtc_state: intel_crtc_state structure
>   *
>   * This function is used to do actual write to hardware using DSB.
>   * On errors, fall back to MMIO. Also this function help to reset the context.
>   */
> -void intel_dsb_commit(struct intel_dsb *dsb)
> +void intel_dsb_commit(const struct intel_crtc_state *crtc_state)
>  {
> -	struct intel_crtc *crtc = container_of(dsb, typeof(*crtc), dsb);
> +	struct intel_dsb *dsb = crtc_state->dsb;
> +	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
>  	struct drm_device *dev = crtc->base.dev;
>  	struct drm_i915_private *dev_priv = to_i915(dev);
>  	enum pipe pipe = crtc->pipe;
>  	u32 tail;
>  
> -	if (!dsb->free_pos)
> +	if (!(dsb && dsb->free_pos))
>  		return;
>  
> -	if (!intel_dsb_enable_engine(dsb))
> +	if (!intel_dsb_enable_engine(dev_priv, pipe, dsb->id))
>  		goto reset;
>  
> -	if (is_dsb_busy(dsb)) {
> +	if (is_dsb_busy(dev_priv, pipe, dsb->id)) {
>  		drm_err(&dev_priv->drm,
>  			"HEAD_PTR write failed - dsb engine is busy.\n");
>  		goto reset;
> @@ -322,7 +226,7 @@ void intel_dsb_commit(struct intel_dsb *dsb)
>  		memset(&dsb->cmd_buf[dsb->free_pos], 0,
>  		       (tail - dsb->free_pos * 4));
>  
> -	if (is_dsb_busy(dsb)) {
> +	if (is_dsb_busy(dev_priv, pipe, dsb->id)) {
>  		drm_err(&dev_priv->drm,
>  			"TAIL_PTR write failed - dsb engine is busy.\n");
>  		goto reset;
> @@ -332,7 +236,7 @@ void intel_dsb_commit(struct intel_dsb *dsb)
>  		    i915_ggtt_offset(dsb->vma), tail);
>  	intel_de_write(dev_priv, DSB_TAIL(pipe, dsb->id),
>  		       i915_ggtt_offset(dsb->vma) + tail);
> -	if (wait_for(!is_dsb_busy(dsb), 1)) {
> +	if (wait_for(!is_dsb_busy(dev_priv, pipe, dsb->id), 1)) {
>  		drm_err(&dev_priv->drm,
>  			"Timed out waiting for DSB workload completion.\n");
>  		goto reset;
> @@ -341,5 +245,75 @@ void intel_dsb_commit(struct intel_dsb *dsb)
>  reset:
>  	dsb->free_pos = 0;
>  	dsb->ins_start_offset = 0;
> -	intel_dsb_disable_engine(dsb);
> +	intel_dsb_disable_engine(dev_priv, pipe, dsb->id);
> +}
> +
> +/**
> + * intel_dsb_prepare() - Allocate, pin and map the DSB command buffer.
> + * @crtc_state: intel_crtc_state structure to prepare associated dsb instance.
> + *
> + * This function prepare the command buffer which is used to store dsb
> + * instructions with data.
> + */
> +void intel_dsb_prepare(struct intel_crtc_state *crtc_state)
> +{
> +	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
> +	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
> +	struct intel_dsb *dsb;
> +	struct drm_i915_gem_object *obj;
> +	struct i915_vma *vma;
> +	u32 *buf;
> +	intel_wakeref_t wakeref;
> +
> +	if (!HAS_DSB(i915))
> +		return;
> +
> +	dsb = kmalloc(sizeof(*dsb), GFP_KERNEL);
> +
> +	wakeref = intel_runtime_pm_get(&i915->runtime_pm);
> +
> +	obj = i915_gem_object_create_internal(i915, DSB_BUF_SIZE);
> +	if (IS_ERR(obj)) {
> +		drm_err(&i915->drm, "Gem object creation failed\n");
> +		goto out;
> +	}
> +
> +	vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
> +	if (IS_ERR(vma)) {
> +		drm_err(&i915->drm, "Vma creation failed\n");
> +		i915_gem_object_put(obj);
> +		goto out;
> +	}
> +
> +	buf = i915_gem_object_pin_map(vma->obj, I915_MAP_WC);
> +	if (IS_ERR(buf)) {
> +		drm_err(&i915->drm, "Command buffer creation failed\n");
> +		goto out;
> +	}
> +
> +	dsb->id = DSB1;
> +	dsb->vma = vma;
> +	dsb->cmd_buf = buf;
> +	dsb->free_pos = 0;
> +	dsb->ins_start_offset = 0;
> +	crtc_state->dsb = dsb;
> +out:
> +	intel_runtime_pm_put(&i915->runtime_pm, wakeref);
Your error handling need work, please fix them. :)
> +}
> +
> +/**
> + * intel_dsb_cleanup() - To cleanup DSB context.
> + * @crtc_state: intel_crtc_state structure to cleanup associated dsb instance.
> + *
> + * This function cleanup the DSB context by unpinning and releasing
> + * the VMA object associated with it.
> + */
> +void intel_dsb_cleanup(struct intel_crtc_state *crtc_state)
> +{
> +	if (!crtc_state->dsb)
> +		return;
> +
> +	i915_vma_unpin_and_release(&crtc_state->dsb->vma, I915_VMA_RELEASE_MAP);
> +	kfree(crtc_state->dsb);
> +	crtc_state->dsb = NULL;
>  }

Otherwise looks good.


~Maarten


> diff --git a/drivers/gpu/drm/i915/display/intel_dsb.h b/drivers/gpu/drm/i915/display/intel_dsb.h
> index 395ef9ce558e..654a11f24b80 100644
> --- a/drivers/gpu/drm/i915/display/intel_dsb.h
> +++ b/drivers/gpu/drm/i915/display/intel_dsb.h
> @@ -10,7 +10,7 @@
>  
>  #include "i915_reg.h"
>  
> -struct intel_crtc;
> +struct intel_crtc_state;
>  struct i915_vma;
>  
>  enum dsb_id {
> @@ -22,7 +22,6 @@ enum dsb_id {
>  };
>  
>  struct intel_dsb {
> -	long refcount;
>  	enum dsb_id id;
>  	u32 *cmd_buf;
>  	struct i915_vma *vma;
> @@ -41,12 +40,12 @@ struct intel_dsb {
>  	u32 ins_start_offset;
>  };
>  
> -struct intel_dsb *
> -intel_dsb_get(struct intel_crtc *crtc);
> -void intel_dsb_put(struct intel_dsb *dsb);
> -void intel_dsb_reg_write(struct intel_dsb *dsb, i915_reg_t reg, u32 val);
> -void intel_dsb_indexed_reg_write(struct intel_dsb *dsb, i915_reg_t reg,
> -				 u32 val);
> -void intel_dsb_commit(struct intel_dsb *dsb);
> +void intel_dsb_prepare(struct intel_crtc_state *crtc_state);
> +void intel_dsb_cleanup(struct intel_crtc_state *crtc_state);
> +void intel_dsb_reg_write(const struct intel_crtc_state *crtc_state,
> +			 i915_reg_t reg, u32 val);
> +void intel_dsb_indexed_reg_write(const struct intel_crtc_state *crtc_state,
> +				 i915_reg_t reg, u32 val);
> +void intel_dsb_commit(const struct intel_crtc_state *crtc_state);
>  
>  #endif


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