Re: [PATCH 20/29] drm/i915: Split engine setup/init into two phases

[Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>]

On 08/04/2019 10:17, Chris Wilson wrote:
> In the next patch, we require the engine vfuncs setup prior to
> initialising the pinned kernel contexts, so split the vfunc setup from
> the engine initialisation and call it earlier.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> ---
>   drivers/gpu/drm/i915/gt/intel_engine.h        |   8 +-
>   drivers/gpu/drm/i915/gt/intel_engine_cs.c     |  99 ++++----
>   drivers/gpu/drm/i915/gt/intel_lrc.c           |  74 ++----
>   drivers/gpu/drm/i915/gt/intel_lrc.h           |   5 +-
>   drivers/gpu/drm/i915/gt/intel_ringbuffer.c    | 232 +++++++++---------
>   drivers/gpu/drm/i915/gt/intel_workarounds.c   |   3 +-
>   drivers/gpu/drm/i915/gt/mock_engine.c         |  48 ++--
>   drivers/gpu/drm/i915/gt/mock_engine.h         |   2 +
>   drivers/gpu/drm/i915/i915_gem.c               |   6 +
>   .../gpu/drm/i915/selftests/mock_gem_device.c  |  12 +-
>   10 files changed, 245 insertions(+), 244 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h
> index a17152e96bf8..a8dc2740ba2f 100644
> --- a/drivers/gpu/drm/i915/gt/intel_engine.h
> +++ b/drivers/gpu/drm/i915/gt/intel_engine.h
> @@ -362,14 +362,12 @@ __intel_ring_space(unsigned int head, unsigned int tail, unsigned int size)
>   	return (head - tail - CACHELINE_BYTES) & (size - 1);
>   }
>   
> -int intel_engine_setup_common(struct intel_engine_cs *engine);
> +int intel_engines_setup(struct drm_i915_private *i915);
>   int intel_engine_init_common(struct intel_engine_cs *engine);
>   void intel_engine_cleanup_common(struct intel_engine_cs *engine);
>   
> -int intel_init_render_ring_buffer(struct intel_engine_cs *engine);
> -int intel_init_bsd_ring_buffer(struct intel_engine_cs *engine);
> -int intel_init_blt_ring_buffer(struct intel_engine_cs *engine);
> -int intel_init_vebox_ring_buffer(struct intel_engine_cs *engine);
> +int intel_ring_submission_setup(struct intel_engine_cs *engine);
> +int intel_ring_submission_init(struct intel_engine_cs *engine);
>   
>   int intel_engine_stop_cs(struct intel_engine_cs *engine);
>   void intel_engine_cancel_stop_cs(struct intel_engine_cs *engine);
> diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> index f6828c0276eb..3f794bc71958 100644
> --- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> +++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> @@ -50,35 +50,24 @@
>   
>   struct engine_class_info {
>   	const char *name;
> -	int (*init_legacy)(struct intel_engine_cs *engine);
> -	int (*init_execlists)(struct intel_engine_cs *engine);
> -
>   	u8 uabi_class;
>   };
>   
>   static const struct engine_class_info intel_engine_classes[] = {
>   	[RENDER_CLASS] = {
>   		.name = "rcs",
> -		.init_execlists = logical_render_ring_init,
> -		.init_legacy = intel_init_render_ring_buffer,
>   		.uabi_class = I915_ENGINE_CLASS_RENDER,
>   	},
>   	[COPY_ENGINE_CLASS] = {
>   		.name = "bcs",
> -		.init_execlists = logical_xcs_ring_init,
> -		.init_legacy = intel_init_blt_ring_buffer,
>   		.uabi_class = I915_ENGINE_CLASS_COPY,
>   	},
>   	[VIDEO_DECODE_CLASS] = {
>   		.name = "vcs",
> -		.init_execlists = logical_xcs_ring_init,
> -		.init_legacy = intel_init_bsd_ring_buffer,
>   		.uabi_class = I915_ENGINE_CLASS_VIDEO,
>   	},
>   	[VIDEO_ENHANCEMENT_CLASS] = {
>   		.name = "vecs",
> -		.init_execlists = logical_xcs_ring_init,
> -		.init_legacy = intel_init_vebox_ring_buffer,
>   		.uabi_class = I915_ENGINE_CLASS_VIDEO_ENHANCE,
>   	},
>   };
> @@ -400,48 +389,39 @@ int intel_engines_init_mmio(struct drm_i915_private *dev_priv)
>   
>   /**
>    * intel_engines_init() - init the Engine Command Streamers
> - * @dev_priv: i915 device private
> + * @i915: i915 device private
>    *
>    * Return: non-zero if the initialization failed.
>    */
> -int intel_engines_init(struct drm_i915_private *dev_priv)
> +int intel_engines_init(struct drm_i915_private *i915)
>   {
> +	int (*init)(struct intel_engine_cs *engine);
>   	struct intel_engine_cs *engine;
>   	enum intel_engine_id id, err_id;
>   	int err;
>   
> -	for_each_engine(engine, dev_priv, id) {
> -		const struct engine_class_info *class_info =
> -			&intel_engine_classes[engine->class];
> -		int (*init)(struct intel_engine_cs *engine);
> -
> -		if (HAS_EXECLISTS(dev_priv))
> -			init = class_info->init_execlists;
> -		else
> -			init = class_info->init_legacy;
> +	if (HAS_EXECLISTS(i915))
> +		init = intel_execlists_submission_init;
> +	else
> +		init = intel_ring_submission_init;
>   
> -		err = -EINVAL;
> +	for_each_engine(engine, i915, id) {
>   		err_id = id;
>   
> -		if (GEM_DEBUG_WARN_ON(!init))
> -			goto cleanup;
> -
>   		err = init(engine);
>   		if (err)
>   			goto cleanup;
> -
> -		GEM_BUG_ON(!engine->submit_request);
>   	}
>   
>   	return 0;
>   
>   cleanup:
> -	for_each_engine(engine, dev_priv, id) {
> +	for_each_engine(engine, i915, id) {
>   		if (id >= err_id) {
>   			kfree(engine);
> -			dev_priv->engine[id] = NULL;
> +			i915->engine[id] = NULL;
>   		} else {
> -			dev_priv->gt.cleanup_engine(engine);
> +			i915->gt.cleanup_engine(engine);
>   		}
>   	}
>   	return err;
> @@ -559,16 +539,7 @@ static int init_status_page(struct intel_engine_cs *engine)
>   	return ret;
>   }
>   
> -/**
> - * intel_engines_setup_common - setup engine state not requiring hw access
> - * @engine: Engine to setup.
> - *
> - * Initializes @engine@ structure members shared between legacy and execlists
> - * submission modes which do not require hardware access.
> - *
> - * Typically done early in the submission mode specific engine setup stage.
> - */
> -int intel_engine_setup_common(struct intel_engine_cs *engine)
> +static int intel_engine_setup_common(struct intel_engine_cs *engine)
>   {
>   	int err;
>   
> @@ -602,6 +573,52 @@ int intel_engine_setup_common(struct intel_engine_cs *engine)
>   	return err;
>   }
>   
> +/**
> + * intel_engines_setup- setup engine state not requiring hw access
> + * @i915: Device to setup.
> + *
> + * Initializes engine structure members shared between legacy and execlists
> + * submission modes which do not require hardware access.
> + *
> + * Typically done early in the submission mode specific engine setup stage.
> + */
> +int intel_engines_setup(struct drm_i915_private *i915)
> +{
> +	int (*setup)(struct intel_engine_cs *engine);
> +	struct intel_engine_cs *engine;
> +	enum intel_engine_id id;
> +	int err;
> +
> +	if (HAS_EXECLISTS(i915))
> +		setup = intel_execlists_submission_setup;
> +	else
> +		setup = intel_ring_submission_setup;
> +
> +	for_each_engine(engine, i915, id) {
> +		err = intel_engine_setup_common(engine);
> +		if (err)
> +			goto cleanup;
> +
> +		err = setup(engine);
> +		if (err)
> +			goto cleanup;
> +
> +		GEM_BUG_ON(!engine->cops);
> +	}
> +
> +	return 0;
> +
> +cleanup:
> +	for_each_engine(engine, i915, id) {
> +		if (engine->cops)
> +			i915->gt.cleanup_engine(engine);
> +		else
> +			kfree(engine);
> +		i915->engine[id] = NULL;
> +	}
> +	return err;
> +}
> +
>   void intel_engines_set_scheduler_caps(struct drm_i915_private *i915)
>   {
>   	static const struct {
> diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
> index 7a5e6e962e61..d4e28fbb5dcd 100644
> --- a/drivers/gpu/drm/i915/gt/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
> @@ -1786,8 +1786,8 @@ static int intel_init_workaround_bb(struct intel_engine_cs *engine)
>   	unsigned int i;
>   	int ret;
>   
> -	if (GEM_DEBUG_WARN_ON(engine->id != RCS0))
> -		return -EINVAL;
> +	if (engine->class != RENDER_CLASS)
> +		return 0;
>   
>   	switch (INTEL_GEN(engine->i915)) {
>   	case 11:
> @@ -2423,15 +2423,8 @@ logical_ring_default_irqs(struct intel_engine_cs *engine)
>   	engine->irq_keep_mask = GT_CONTEXT_SWITCH_INTERRUPT << shift;
>   }
>   
> -static int
> -logical_ring_setup(struct intel_engine_cs *engine)
> +int intel_execlists_submission_setup(struct intel_engine_cs *engine)
>   {
> -	int err;
> -
> -	err = intel_engine_setup_common(engine);
> -	if (err)
> -		return err;
> -
>   	/* Intentionally left blank. */
>   	engine->buffer = NULL;
>   
> @@ -2441,10 +2434,16 @@ logical_ring_setup(struct intel_engine_cs *engine)
>   	logical_ring_default_vfuncs(engine);
>   	logical_ring_default_irqs(engine);
>   
> +	if (engine->class == RENDER_CLASS) {
> +		engine->init_context = gen8_init_rcs_context;
> +		engine->emit_flush = gen8_emit_flush_render;
> +		engine->emit_fini_breadcrumb = gen8_emit_fini_breadcrumb_rcs;
> +	}
> +
>   	return 0;
>   }
>   
> -static int logical_ring_init(struct intel_engine_cs *engine)
> +int intel_execlists_submission_init(struct intel_engine_cs *engine)
>   {
>   	struct drm_i915_private *i915 = engine->i915;
>   	struct intel_engine_execlists * const execlists = &engine->execlists;
> @@ -2456,6 +2455,15 @@ static int logical_ring_init(struct intel_engine_cs *engine)
>   		return ret;
>   
>   	intel_engine_init_workarounds(engine);
> +	intel_engine_init_whitelist(engine);
> +
> +	if (intel_init_workaround_bb(engine))
> +		/*
> +		 * We continue even if we fail to initialize WA batch
> +		 * because we only expect rare glitches but nothing
> +		 * critical to prevent us from using GPU
> +		 */
> +		DRM_ERROR("WA batch buffer initialization failed\n");
>   
>   	if (HAS_LOGICAL_RING_ELSQ(i915)) {
>   		execlists->submit_reg = i915->uncore.regs +
> @@ -2483,50 +2491,6 @@ static int logical_ring_init(struct intel_engine_cs *engine)
>   	return 0;
>   }
>   
> -int logical_render_ring_init(struct intel_engine_cs *engine)
> -{
> -	int ret;
> -
> -	ret = logical_ring_setup(engine);
> -	if (ret)
> -		return ret;
> -
> -	/* Override some for render ring. */
> -	engine->init_context = gen8_init_rcs_context;
> -	engine->emit_flush = gen8_emit_flush_render;
> -	engine->emit_fini_breadcrumb = gen8_emit_fini_breadcrumb_rcs;
> -
> -	ret = logical_ring_init(engine);
> -	if (ret)
> -		return ret;
> -
> -	ret = intel_init_workaround_bb(engine);
> -	if (ret) {
> -		/*
> -		 * We continue even if we fail to initialize WA batch
> -		 * because we only expect rare glitches but nothing
> -		 * critical to prevent us from using GPU
> -		 */
> -		DRM_ERROR("WA batch buffer initialization failed: %d\n",
> -			  ret);
> -	}
> -
> -	intel_engine_init_whitelist(engine);
> -
> -	return 0;
> -}
> -
> -int logical_xcs_ring_init(struct intel_engine_cs *engine)
> -{
> -	int err;
> -
> -	err = logical_ring_setup(engine);
> -	if (err)
> -		return err;
> -
> -	return logical_ring_init(engine);
> -}
> -
>   static u32 intel_lr_indirect_ctx_offset(struct intel_engine_cs *engine)
>   {
>   	u32 indirect_ctx_offset;
> diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.h b/drivers/gpu/drm/i915/gt/intel_lrc.h
> index a598f2d56de3..a56ee45b9e3c 100644
> --- a/drivers/gpu/drm/i915/gt/intel_lrc.h
> +++ b/drivers/gpu/drm/i915/gt/intel_lrc.h
> @@ -67,8 +67,9 @@ enum {
>   
>   /* Logical Rings */
>   void intel_logical_ring_cleanup(struct intel_engine_cs *engine);
> -int logical_render_ring_init(struct intel_engine_cs *engine);
> -int logical_xcs_ring_init(struct intel_engine_cs *engine);
> +
> +int intel_execlists_submission_setup(struct intel_engine_cs *engine);
> +int intel_execlists_submission_init(struct intel_engine_cs *engine);
>   
>   /* Logical Ring Contexts */
>   
> diff --git a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
> index 748c133b83b4..3204dbb541f6 100644
> --- a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
> +++ b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
> @@ -1523,54 +1523,6 @@ static const struct intel_context_ops ring_context_ops = {
>   	.destroy = ring_context_destroy,
>   };
>   
> -static int intel_init_ring_buffer(struct intel_engine_cs *engine)
> -{
> -	struct i915_timeline *timeline;
> -	struct intel_ring *ring;
> -	int err;
> -
> -	err = intel_engine_setup_common(engine);
> -	if (err)
> -		return err;
> -
> -	timeline = i915_timeline_create(engine->i915, engine->status_page.vma);
> -	if (IS_ERR(timeline)) {
> -		err = PTR_ERR(timeline);
> -		goto err;
> -	}
> -	GEM_BUG_ON(timeline->has_initial_breadcrumb);
> -
> -	ring = intel_engine_create_ring(engine, timeline, 32 * PAGE_SIZE);
> -	i915_timeline_put(timeline);
> -	if (IS_ERR(ring)) {
> -		err = PTR_ERR(ring);
> -		goto err;
> -	}
> -
> -	err = intel_ring_pin(ring);
> -	if (err)
> -		goto err_ring;
> -
> -	GEM_BUG_ON(engine->buffer);
> -	engine->buffer = ring;
> -
> -	err = intel_engine_init_common(engine);
> -	if (err)
> -		goto err_unpin;
> -
> -	GEM_BUG_ON(ring->timeline->hwsp_ggtt != engine->status_page.vma);
> -
> -	return 0;
> -
> -err_unpin:
> -	intel_ring_unpin(ring);
> -err_ring:
> -	intel_ring_put(ring);
> -err:
> -	intel_engine_cleanup_common(engine);
> -	return err;
> -}
> -
>   void intel_engine_cleanup(struct intel_engine_cs *engine)
>   {
>   	struct drm_i915_private *dev_priv = engine->i915;
> @@ -2166,24 +2118,6 @@ static int gen6_ring_flush(struct i915_request *rq, u32 mode)
>   	return gen6_flush_dw(rq, mode, MI_INVALIDATE_TLB);
>   }
>   
> -static void intel_ring_init_irq(struct drm_i915_private *dev_priv,
> -				struct intel_engine_cs *engine)
> -{
> -	if (INTEL_GEN(dev_priv) >= 6) {
> -		engine->irq_enable = gen6_irq_enable;
> -		engine->irq_disable = gen6_irq_disable;
> -	} else if (INTEL_GEN(dev_priv) >= 5) {
> -		engine->irq_enable = gen5_irq_enable;
> -		engine->irq_disable = gen5_irq_disable;
> -	} else if (INTEL_GEN(dev_priv) >= 3) {
> -		engine->irq_enable = i9xx_irq_enable;
> -		engine->irq_disable = i9xx_irq_disable;
> -	} else {
> -		engine->irq_enable = i8xx_irq_enable;
> -		engine->irq_disable = i8xx_irq_disable;
> -	}
> -}
> -
>   static void i9xx_set_default_submission(struct intel_engine_cs *engine)
>   {
>   	engine->submit_request = i9xx_submit_request;
> @@ -2199,13 +2133,33 @@ static void gen6_bsd_set_default_submission(struct intel_engine_cs *engine)
>   	engine->submit_request = gen6_bsd_submit_request;
>   }
>   
> -static void intel_ring_default_vfuncs(struct drm_i915_private *dev_priv,
> -				      struct intel_engine_cs *engine)
> +static void setup_irq(struct intel_engine_cs *engine)
> +{
> +	struct drm_i915_private *i915 = engine->i915;
> +
> +	if (INTEL_GEN(i915) >= 6) {
> +		engine->irq_enable = gen6_irq_enable;
> +		engine->irq_disable = gen6_irq_disable;
> +	} else if (INTEL_GEN(i915) >= 5) {
> +		engine->irq_enable = gen5_irq_enable;
> +		engine->irq_disable = gen5_irq_disable;
> +	} else if (INTEL_GEN(i915) >= 3) {
> +		engine->irq_enable = i9xx_irq_enable;
> +		engine->irq_disable = i9xx_irq_disable;
> +	} else {
> +		engine->irq_enable = i8xx_irq_enable;
> +		engine->irq_disable = i8xx_irq_disable;
> +	}
> +}
> +
> +static void setup_xcs(struct intel_engine_cs *engine)
>   {
> +	struct drm_i915_private *i915 = engine->i915;
> +
>   	/* gen8+ are only supported with execlists */
> -	GEM_BUG_ON(INTEL_GEN(dev_priv) >= 8);
> +	GEM_BUG_ON(INTEL_GEN(i915) >= 8);
>   
> -	intel_ring_init_irq(dev_priv, engine);
> +	setup_irq(engine);
>   
>   	engine->resume = xcs_resume;
>   	engine->reset.prepare = reset_prepare;
> @@ -2221,117 +2175,96 @@ static void intel_ring_default_vfuncs(struct drm_i915_private *dev_priv,
>   	 * engine->emit_init_breadcrumb().
>   	 */
>   	engine->emit_fini_breadcrumb = i9xx_emit_breadcrumb;
> -	if (IS_GEN(dev_priv, 5))
> +	if (IS_GEN(i915, 5))
>   		engine->emit_fini_breadcrumb = gen5_emit_breadcrumb;
>   
>   	engine->set_default_submission = i9xx_set_default_submission;
>   
> -	if (INTEL_GEN(dev_priv) >= 6)
> +	if (INTEL_GEN(i915) >= 6)
>   		engine->emit_bb_start = gen6_emit_bb_start;
> -	else if (INTEL_GEN(dev_priv) >= 4)
> +	else if (INTEL_GEN(i915) >= 4)
>   		engine->emit_bb_start = i965_emit_bb_start;
> -	else if (IS_I830(dev_priv) || IS_I845G(dev_priv))
> +	else if (IS_I830(i915) || IS_I845G(i915))
>   		engine->emit_bb_start = i830_emit_bb_start;
>   	else
>   		engine->emit_bb_start = i915_emit_bb_start;
>   }
>   
> -int intel_init_render_ring_buffer(struct intel_engine_cs *engine)
> +static void setup_rcs(struct intel_engine_cs *engine)
>   {
> -	struct drm_i915_private *dev_priv = engine->i915;
> -	int ret;
> -
> -	intel_ring_default_vfuncs(dev_priv, engine);
> +	struct drm_i915_private *i915 = engine->i915;
>   
> -	if (HAS_L3_DPF(dev_priv))
> +	if (HAS_L3_DPF(i915))
>   		engine->irq_keep_mask = GT_RENDER_L3_PARITY_ERROR_INTERRUPT;
>   
>   	engine->irq_enable_mask = GT_RENDER_USER_INTERRUPT;
>   
> -	if (INTEL_GEN(dev_priv) >= 7) {
> +	if (INTEL_GEN(i915) >= 7) {
>   		engine->init_context = intel_rcs_ctx_init;
>   		engine->emit_flush = gen7_render_ring_flush;
>   		engine->emit_fini_breadcrumb = gen7_rcs_emit_breadcrumb;
> -	} else if (IS_GEN(dev_priv, 6)) {
> +	} else if (IS_GEN(i915, 6)) {
>   		engine->init_context = intel_rcs_ctx_init;
>   		engine->emit_flush = gen6_render_ring_flush;
>   		engine->emit_fini_breadcrumb = gen6_rcs_emit_breadcrumb;
> -	} else if (IS_GEN(dev_priv, 5)) {
> +	} else if (IS_GEN(i915, 5)) {
>   		engine->emit_flush = gen4_render_ring_flush;
>   	} else {
> -		if (INTEL_GEN(dev_priv) < 4)
> +		if (INTEL_GEN(i915) < 4)
>   			engine->emit_flush = gen2_render_ring_flush;
>   		else
>   			engine->emit_flush = gen4_render_ring_flush;
>   		engine->irq_enable_mask = I915_USER_INTERRUPT;
>   	}
>   
> -	if (IS_HASWELL(dev_priv))
> +	if (IS_HASWELL(i915))
>   		engine->emit_bb_start = hsw_emit_bb_start;
>   
>   	engine->resume = rcs_resume;
> -
> -	ret = intel_init_ring_buffer(engine);
> -	if (ret)
> -		return ret;
> -
> -	return 0;
>   }
>   
> -int intel_init_bsd_ring_buffer(struct intel_engine_cs *engine)
> +static void setup_vcs(struct intel_engine_cs *engine)
>   {
> -	struct drm_i915_private *dev_priv = engine->i915;
> -
> -	intel_ring_default_vfuncs(dev_priv, engine);
> +	struct drm_i915_private *i915 = engine->i915;
>   
> -	if (INTEL_GEN(dev_priv) >= 6) {
> +	if (INTEL_GEN(i915) >= 6) {
>   		/* gen6 bsd needs a special wa for tail updates */
> -		if (IS_GEN(dev_priv, 6))
> +		if (IS_GEN(i915, 6))
>   			engine->set_default_submission = gen6_bsd_set_default_submission;
>   		engine->emit_flush = gen6_bsd_ring_flush;
>   		engine->irq_enable_mask = GT_BSD_USER_INTERRUPT;
>   
> -		if (IS_GEN(dev_priv, 6))
> +		if (IS_GEN(i915, 6))
>   			engine->emit_fini_breadcrumb = gen6_xcs_emit_breadcrumb;
>   		else
>   			engine->emit_fini_breadcrumb = gen7_xcs_emit_breadcrumb;
>   	} else {
>   		engine->emit_flush = bsd_ring_flush;
> -		if (IS_GEN(dev_priv, 5))
> +		if (IS_GEN(i915, 5))
>   			engine->irq_enable_mask = ILK_BSD_USER_INTERRUPT;
>   		else
>   			engine->irq_enable_mask = I915_BSD_USER_INTERRUPT;
>   	}
> -
> -	return intel_init_ring_buffer(engine);
>   }
>   
> -int intel_init_blt_ring_buffer(struct intel_engine_cs *engine)
> +static void setup_bcs(struct intel_engine_cs *engine)
>   {
> -	struct drm_i915_private *dev_priv = engine->i915;
> -
> -	GEM_BUG_ON(INTEL_GEN(dev_priv) < 6);
> -
> -	intel_ring_default_vfuncs(dev_priv, engine);
> +	struct drm_i915_private *i915 = engine->i915;
>   
>   	engine->emit_flush = gen6_ring_flush;
>   	engine->irq_enable_mask = GT_BLT_USER_INTERRUPT;
>   
> -	if (IS_GEN(dev_priv, 6))
> +	if (IS_GEN(i915, 6))
>   		engine->emit_fini_breadcrumb = gen6_xcs_emit_breadcrumb;
>   	else
>   		engine->emit_fini_breadcrumb = gen7_xcs_emit_breadcrumb;
> -
> -	return intel_init_ring_buffer(engine);
>   }
>   
> -int intel_init_vebox_ring_buffer(struct intel_engine_cs *engine)
> +static void setup_vecs(struct intel_engine_cs *engine)
>   {
> -	struct drm_i915_private *dev_priv = engine->i915;
> -
> -	GEM_BUG_ON(INTEL_GEN(dev_priv) < 7);
> +	struct drm_i915_private *i915 = engine->i915;
>   
> -	intel_ring_default_vfuncs(dev_priv, engine);
> +	GEM_BUG_ON(INTEL_GEN(i915) < 7);
>   
>   	engine->emit_flush = gen6_ring_flush;
>   	engine->irq_enable_mask = PM_VEBOX_USER_INTERRUPT;
> @@ -2339,6 +2272,73 @@ int intel_init_vebox_ring_buffer(struct intel_engine_cs *engine)
>   	engine->irq_disable = hsw_vebox_irq_disable;
>   
>   	engine->emit_fini_breadcrumb = gen7_xcs_emit_breadcrumb;
> +}
> +
> +int intel_ring_submission_setup(struct intel_engine_cs *engine)
> +{
> +	setup_xcs(engine);

It is actually setup_common, no? I think it would be clearer since we 
use to have xcs mean !rcs.

> +
> +	switch (engine->class) {
> +	case RENDER_CLASS:
> +		setup_rcs(engine);
> +		break;
> +	case VIDEO_DECODE_CLASS:
> +		setup_vcs(engine);
> +		break;
> +	case COPY_ENGINE_CLASS:
> +		setup_bcs(engine);
> +		break;
> +	case VIDEO_ENHANCEMENT_CLASS:
> +		setup_vecs(engine);
> +		break;
> +	default:
> +		MISSING_CASE(engine->class);
> +		return -ENODEV;
> +	}
> +
> +	return 0;
> +}
> +
> +int intel_ring_submission_init(struct intel_engine_cs *engine)
> +{
> +	struct i915_timeline *timeline;
> +	struct intel_ring *ring;
> +	int err;
> +
> +	timeline = i915_timeline_create(engine->i915, engine->status_page.vma);
> +	if (IS_ERR(timeline)) {
> +		err = PTR_ERR(timeline);
> +		goto err;
> +	}
> +	GEM_BUG_ON(timeline->has_initial_breadcrumb);
> +
> +	ring = intel_engine_create_ring(engine, timeline, 32 * PAGE_SIZE);
> +	i915_timeline_put(timeline);
> +	if (IS_ERR(ring)) {
> +		err = PTR_ERR(ring);
> +		goto err;
> +	}
> +
> +	err = intel_ring_pin(ring);
> +	if (err)
> +		goto err_ring;
>   
> -	return intel_init_ring_buffer(engine);
> +	GEM_BUG_ON(engine->buffer);
> +	engine->buffer = ring;
> +
> +	err = intel_engine_init_common(engine);
> +	if (err)
> +		goto err_unpin;
> +
> +	GEM_BUG_ON(ring->timeline->hwsp_ggtt != engine->status_page.vma);
> +
> +	return 0;
> +
> +err_unpin:
> +	intel_ring_unpin(ring);
> +err_ring:
> +	intel_ring_put(ring);
> +err:
> +	intel_engine_cleanup_common(engine);
> +	return err;
>   }
> diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> index 2d6d17ee3601..e9d8174b24e8 100644
> --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> @@ -1060,7 +1060,8 @@ void intel_engine_init_whitelist(struct intel_engine_cs *engine)
>   	struct drm_i915_private *i915 = engine->i915;
>   	struct i915_wa_list *w = &engine->whitelist;
>   
> -	GEM_BUG_ON(engine->id != RCS0);
> +	if (engine->class != RENDER_CLASS)
> +		return;
>   
>   	wa_init_start(w, "whitelist");
>   
> diff --git a/drivers/gpu/drm/i915/gt/mock_engine.c b/drivers/gpu/drm/i915/gt/mock_engine.c
> index a79d9909d171..3b672e011cf0 100644
> --- a/drivers/gpu/drm/i915/gt/mock_engine.c
> +++ b/drivers/gpu/drm/i915/gt/mock_engine.c
> @@ -239,7 +239,6 @@ struct intel_engine_cs *mock_engine(struct drm_i915_private *i915,
>   				    int id)
>   {
>   	struct mock_engine *engine;
> -	int err;
>   
>   	GEM_BUG_ON(id >= I915_NUM_ENGINES);
>   
> @@ -265,37 +264,44 @@ struct intel_engine_cs *mock_engine(struct drm_i915_private *i915,
>   	engine->base.reset.finish = mock_reset_finish;
>   	engine->base.cancel_requests = mock_cancel_requests;
>   
> -	if (i915_timeline_init(i915, &engine->base.timeline, NULL))
> -		goto err_free;
> -	i915_timeline_set_subclass(&engine->base.timeline, TIMELINE_ENGINE);
> -
> -	intel_engine_init_breadcrumbs(&engine->base);
> -	intel_engine_init_execlists(&engine->base);
> -	intel_engine_init__pm(&engine->base);
> -
>   	/* fake hw queue */
>   	spin_lock_init(&engine->hw_lock);
>   	timer_setup(&engine->hw_delay, hw_delay_complete, 0);
>   	INIT_LIST_HEAD(&engine->hw_queue);
>   
> -	engine->base.kernel_context =
> -		intel_context_instance(i915->kernel_context, &engine->base);
> -	if (IS_ERR(engine->base.kernel_context))
> +	return &engine->base;
> +}
> +
> +int mock_engine_init(struct intel_engine_cs *engine)
> +{
> +	struct drm_i915_private *i915 = engine->i915;
> +	int err;
> +
> +	intel_engine_init_breadcrumbs(engine);
> +	intel_engine_init_execlists(engine);
> +	intel_engine_init__pm(engine);
> +
> +	if (i915_timeline_init(i915, &engine->timeline, NULL))
>   		goto err_breadcrumbs;
> +	i915_timeline_set_subclass(&engine->timeline, TIMELINE_ENGINE);
> +
> +	engine->kernel_context =
> +		intel_context_instance(i915->kernel_context, engine);
> +	if (IS_ERR(engine->kernel_context))
> +		goto err_timeline;
>   
> -	err = intel_context_pin(engine->base.kernel_context);
> -	intel_context_put(engine->base.kernel_context);
> +	err = intel_context_pin(engine->kernel_context);
> +	intel_context_put(engine->kernel_context);
>   	if (err)
> -		goto err_breadcrumbs;
> +		goto err_timeline;
>   
> -	return &engine->base;
> +	return 0;
>   
> +err_timeline:
> +	i915_timeline_fini(&engine->timeline);
>   err_breadcrumbs:
> -	intel_engine_fini_breadcrumbs(&engine->base);
> -	i915_timeline_fini(&engine->base.timeline);
> -err_free:
> -	kfree(engine);
> -	return NULL;
> +	intel_engine_fini_breadcrumbs(engine);
> +	return -ENOMEM;
>   }
>   
>   void mock_engine_flush(struct intel_engine_cs *engine)
> diff --git a/drivers/gpu/drm/i915/gt/mock_engine.h b/drivers/gpu/drm/i915/gt/mock_engine.h
> index 44b35a85e9d1..3f9b698c49d2 100644
> --- a/drivers/gpu/drm/i915/gt/mock_engine.h
> +++ b/drivers/gpu/drm/i915/gt/mock_engine.h
> @@ -42,6 +42,8 @@ struct mock_engine {
>   struct intel_engine_cs *mock_engine(struct drm_i915_private *i915,
>   				    const char *name,
>   				    int id);
> +int mock_engine_init(struct intel_engine_cs *engine);
> +
>   void mock_engine_flush(struct intel_engine_cs *engine);
>   void mock_engine_reset(struct intel_engine_cs *engine);
>   void mock_engine_free(struct intel_engine_cs *engine);
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index a6436c77109a..50266e87c225 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -4523,6 +4523,12 @@ int i915_gem_init(struct drm_i915_private *dev_priv)
>   		goto err_ggtt;
>   	}
>   
> +	ret = intel_engines_setup(dev_priv);
> +	if (ret) {
> +		GEM_BUG_ON(ret == -EIO);
> +		goto err_unlock;
> +	}
> +
>   	ret = i915_gem_contexts_init(dev_priv);
>   	if (ret) {
>   		GEM_BUG_ON(ret == -EIO);
> diff --git a/drivers/gpu/drm/i915/selftests/mock_gem_device.c b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
> index c072424c6b7c..e4033d0576c4 100644
> --- a/drivers/gpu/drm/i915/selftests/mock_gem_device.c
> +++ b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
> @@ -209,12 +209,16 @@ struct drm_i915_private *mock_gem_device(void)
>   	mock_init_ggtt(i915, &i915->ggtt);
>   
>   	mkwrite_device_info(i915)->engine_mask = BIT(0);
> -	i915->kernel_context = mock_context(i915, NULL);
> -	if (!i915->kernel_context)
> -		goto err_unlock;
>   
>   	i915->engine[RCS0] = mock_engine(i915, "mock", RCS0);
>   	if (!i915->engine[RCS0])
> +		goto err_unlock;
> +
> +	i915->kernel_context = mock_context(i915, NULL);
> +	if (!i915->kernel_context)
> +		goto err_engine;
> +
> +	if (mock_engine_init(i915->engine[RCS0]))
>   		goto err_context;
>   
>   	mutex_unlock(&i915->drm.struct_mutex);
> @@ -225,6 +229,8 @@ struct drm_i915_private *mock_gem_device(void)
>   
>   err_context:
>   	i915_gem_contexts_fini(i915);
> +err_engine:
> +	mock_engine_free(i915->engine[RCS0]);
>   err_unlock:
>   	mutex_unlock(&i915->drm.struct_mutex);
>   	i915_timelines_fini(i915);

After a couple backs and forth to triple check things I did not spot any 
mistakes in code split and movement so:

Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>

Regards,

Tvrtko
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