Re: [PATCH 4/6] drm/i915: Allow mmio updates on all platforms.

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On Wed, Mar 23, 2016 at 02:24:30PM +0100, Maarten Lankhorst wrote:
> Rename intel_unpin_work to intel_flip_work and use it for mmio flips
> and unpinning. Use flip_queued_req to hold the wait request in the
> mmio case and allow the vblank interrupt to complete mmio work to
> have mmio flips run correctly on g4 and earlier.

Before you actually go and trust drm_vblank_count() you should make it
race free.

> 
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/i915_debugfs.c  |   4 +-
>  drivers/gpu/drm/i915/intel_display.c | 271 +++++++++++------------------------
>  drivers/gpu/drm/i915/intel_drv.h     |  16 +--
>  3 files changed, 87 insertions(+), 204 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 4a0078c17cd1..bc2ae70abcea 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -573,10 +573,10 @@ static int i915_gem_pageflip_info(struct seq_file *m, void *data)
>  	for_each_intel_crtc(dev, crtc) {
>  		const char pipe = pipe_name(crtc->pipe);
>  		const char plane = plane_name(crtc->plane);
> -		struct intel_unpin_work *work;
> +		struct intel_flip_work *work;
>  
>  		spin_lock_irq(&dev->event_lock);
> -		work = crtc->unpin_work;
> +		work = crtc->flip_work;
>  		if (work == NULL) {
>  			seq_printf(m, "No flip due on pipe %c (plane %c)\n",
>  				   pipe, plane);
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index c52eb1bb4f24..3b082020aab8 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -47,6 +47,11 @@
>  #include <linux/reservation.h>
>  #include <linux/dma-buf.h>
>  
> +static bool is_mmio_work(struct intel_flip_work *work)
> +{
> +	return work->mmio_work.func;
> +}
> +
>  /* Primary plane formats for gen <= 3 */
>  static const uint32_t i8xx_primary_formats[] = {
>  	DRM_FORMAT_C8,
> @@ -3243,7 +3248,7 @@ static bool intel_crtc_has_pending_flip(struct drm_crtc *crtc)
>  		return false;
>  
>  	spin_lock_irq(&dev->event_lock);
> -	pending = to_intel_crtc(crtc)->unpin_work != NULL;
> +	pending = to_intel_crtc(crtc)->flip_work != NULL;
>  	spin_unlock_irq(&dev->event_lock);
>  
>  	return pending;
> @@ -3825,7 +3830,7 @@ bool intel_has_pending_fb_unpin(struct drm_device *dev)
>  		if (atomic_read(&crtc->unpin_work_count) == 0)
>  			continue;
>  
> -		if (crtc->unpin_work)
> +		if (crtc->flip_work)
>  			intel_wait_for_vblank(dev, crtc->pipe);
>  
>  		return true;
> @@ -3837,11 +3842,11 @@ bool intel_has_pending_fb_unpin(struct drm_device *dev)
>  static void page_flip_completed(struct intel_crtc *intel_crtc)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
> -	struct intel_unpin_work *work = intel_crtc->unpin_work;
> +	struct intel_flip_work *work = intel_crtc->flip_work;
>  
> -	/* ensure that the unpin work is consistent wrt ->pending. */
> +	/* ensure that the flip work is consistent wrt ->pending. */
>  	smp_rmb();
> -	intel_crtc->unpin_work = NULL;
> +	intel_crtc->flip_work = NULL;
>  
>  	if (work->event)
>  		drm_send_vblank_event(intel_crtc->base.dev,
> @@ -3851,7 +3856,7 @@ static void page_flip_completed(struct intel_crtc *intel_crtc)
>  	drm_crtc_vblank_put(&intel_crtc->base);
>  
>  	wake_up_all(&dev_priv->pending_flip_queue);
> -	queue_work(dev_priv->wq, &work->work);
> +	queue_work(dev_priv->wq, &work->unpin_work);
>  
>  	trace_i915_flip_complete(intel_crtc->plane,
>  				 work->pending_flip_obj);
> @@ -3875,9 +3880,11 @@ static int intel_crtc_wait_for_pending_flips(struct drm_crtc *crtc)
>  
>  	if (ret == 0) {
>  		struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> +		struct intel_flip_work *work;
>  
>  		spin_lock_irq(&dev->event_lock);
> -		if (intel_crtc->unpin_work) {
> +		work = intel_crtc->flip_work;
> +		if (work && !is_mmio_work(work)) {
>  			WARN_ONCE(1, "Removing stuck page flip\n");
>  			page_flip_completed(intel_crtc);
>  		}
> @@ -6259,7 +6266,7 @@ static void intel_crtc_disable_noatomic(struct drm_crtc *crtc)
>  		return;
>  
>  	if (to_intel_plane_state(crtc->primary->state)->visible) {
> -		WARN_ON(intel_crtc->unpin_work);
> +		WARN_ON(intel_crtc->flip_work);
>  
>  		intel_pre_disable_primary_noatomic(crtc);
>  
> @@ -10781,15 +10788,16 @@ static void intel_crtc_destroy(struct drm_crtc *crtc)
>  {
>  	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
>  	struct drm_device *dev = crtc->dev;
> -	struct intel_unpin_work *work;
> +	struct intel_flip_work *work;
>  
>  	spin_lock_irq(&dev->event_lock);
> -	work = intel_crtc->unpin_work;
> -	intel_crtc->unpin_work = NULL;
> +	work = intel_crtc->flip_work;
> +	intel_crtc->flip_work = NULL;
>  	spin_unlock_irq(&dev->event_lock);
>  
>  	if (work) {
> -		cancel_work_sync(&work->work);
> +		cancel_work_sync(&work->mmio_work);
> +		cancel_work_sync(&work->unpin_work);
>  		kfree(work);
>  	}
>  
> @@ -10800,12 +10808,15 @@ static void intel_crtc_destroy(struct drm_crtc *crtc)
>  
>  static void intel_unpin_work_fn(struct work_struct *__work)
>  {
> -	struct intel_unpin_work *work =
> -		container_of(__work, struct intel_unpin_work, work);
> +	struct intel_flip_work *work =
> +		container_of(__work, struct intel_flip_work, unpin_work);
>  	struct intel_crtc *crtc = to_intel_crtc(work->crtc);
>  	struct drm_device *dev = crtc->base.dev;
>  	struct drm_plane *primary = crtc->base.primary;
>  
> +	if (is_mmio_work(work))
> +		flush_work(&work->mmio_work);
> +
>  	mutex_lock(&dev->struct_mutex);
>  	intel_unpin_fb_obj(work->old_fb, primary->state->rotation);
>  	drm_gem_object_unreference(&work->pending_flip_obj->base);
> @@ -10871,16 +10882,16 @@ static bool page_flip_finished(struct intel_crtc *crtc)
>  	 * anyway, we don't really care.
>  	 */
>  	return (I915_READ(DSPSURFLIVE(crtc->plane)) & ~0xfff) ==
> -		crtc->unpin_work->gtt_offset &&
> +		crtc->flip_work->gtt_offset &&
>  		g4x_flip_count_after_eq(I915_READ(PIPE_FLIPCOUNT_G4X(crtc->pipe)),
> -				    crtc->unpin_work->flip_count);
> +				    crtc->flip_work->flip_count);
>  }
>  
>  static void do_intel_finish_page_flip(struct drm_device *dev,
>  				      struct drm_crtc *crtc)
>  {
>  	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> -	struct intel_unpin_work *work;
> +	struct intel_flip_work *work;
>  	unsigned long flags;
>  
>  	/* Ignore early vblank irqs */
> @@ -10892,11 +10903,11 @@ static void do_intel_finish_page_flip(struct drm_device *dev,
>  	 * lost pageflips) so needs the full irqsave spinlocks.
>  	 */
>  	spin_lock_irqsave(&dev->event_lock, flags);
> -	work = intel_crtc->unpin_work;
> +	work = intel_crtc->flip_work;
>  
>  	if (work == NULL ||
>  	    atomic_read(&work->pending) == INTEL_FLIP_INACTIVE ||
> -	   !page_flip_finished(intel_crtc)) {
> +	    !page_flip_finished(intel_crtc)) {
>  		spin_unlock_irqrestore(&dev->event_lock, flags);
>  		return;
>  	}
> @@ -10922,7 +10933,7 @@ void intel_finish_page_flip_plane(struct drm_device *dev, int plane)
>  	do_intel_finish_page_flip(dev, crtc);
>  }
>  
> -static inline void intel_mark_page_flip_active(struct intel_unpin_work *work)
> +static inline void intel_mark_page_flip_active(struct intel_flip_work *work)
>  {
>  	/* Ensure that the work item is consistent when activating it ... */
>  	smp_wmb();
> @@ -10959,10 +10970,9 @@ static int intel_gen2_queue_flip(struct drm_device *dev,
>  	intel_ring_emit(engine, MI_DISPLAY_FLIP |
>  			MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
>  	intel_ring_emit(engine, fb->pitches[0]);
> -	intel_ring_emit(engine, intel_crtc->unpin_work->gtt_offset);
> +	intel_ring_emit(engine, intel_crtc->flip_work->gtt_offset);
>  	intel_ring_emit(engine, 0); /* aux display base address, unused */
>  
> -	intel_mark_page_flip_active(intel_crtc->unpin_work);
>  	return 0;
>  }
>  
> @@ -10991,10 +11001,9 @@ static int intel_gen3_queue_flip(struct drm_device *dev,
>  	intel_ring_emit(engine, MI_DISPLAY_FLIP_I915 |
>  			MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
>  	intel_ring_emit(engine, fb->pitches[0]);
> -	intel_ring_emit(engine, intel_crtc->unpin_work->gtt_offset);
> +	intel_ring_emit(engine, intel_crtc->flip_work->gtt_offset);
>  	intel_ring_emit(engine, MI_NOOP);
>  
> -	intel_mark_page_flip_active(intel_crtc->unpin_work);
>  	return 0;
>  }
>  
> @@ -11022,7 +11031,7 @@ static int intel_gen4_queue_flip(struct drm_device *dev,
>  	intel_ring_emit(engine, MI_DISPLAY_FLIP |
>  			MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
>  	intel_ring_emit(engine, fb->pitches[0]);
> -	intel_ring_emit(engine, intel_crtc->unpin_work->gtt_offset |
> +	intel_ring_emit(engine, intel_crtc->flip_work->gtt_offset |
>  			obj->tiling_mode);
>  
>  	/* XXX Enabling the panel-fitter across page-flip is so far
> @@ -11033,7 +11042,6 @@ static int intel_gen4_queue_flip(struct drm_device *dev,
>  	pipesrc = I915_READ(PIPESRC(intel_crtc->pipe)) & 0x0fff0fff;
>  	intel_ring_emit(engine, pf | pipesrc);
>  
> -	intel_mark_page_flip_active(intel_crtc->unpin_work);
>  	return 0;
>  }
>  
> @@ -11057,7 +11065,7 @@ static int intel_gen6_queue_flip(struct drm_device *dev,
>  	intel_ring_emit(engine, MI_DISPLAY_FLIP |
>  			MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
>  	intel_ring_emit(engine, fb->pitches[0] | obj->tiling_mode);
> -	intel_ring_emit(engine, intel_crtc->unpin_work->gtt_offset);
> +	intel_ring_emit(engine, intel_crtc->flip_work->gtt_offset);
>  
>  	/* Contrary to the suggestions in the documentation,
>  	 * "Enable Panel Fitter" does not seem to be required when page
> @@ -11069,7 +11077,6 @@ static int intel_gen6_queue_flip(struct drm_device *dev,
>  	pipesrc = I915_READ(PIPESRC(intel_crtc->pipe)) & 0x0fff0fff;
>  	intel_ring_emit(engine, pf | pipesrc);
>  
> -	intel_mark_page_flip_active(intel_crtc->unpin_work);
>  	return 0;
>  }
>  
> @@ -11161,10 +11168,9 @@ static int intel_gen7_queue_flip(struct drm_device *dev,
>  
>  	intel_ring_emit(engine, MI_DISPLAY_FLIP_I915 | plane_bit);
>  	intel_ring_emit(engine, (fb->pitches[0] | obj->tiling_mode));
> -	intel_ring_emit(engine, intel_crtc->unpin_work->gtt_offset);
> +	intel_ring_emit(engine, intel_crtc->flip_work->gtt_offset);
>  	intel_ring_emit(engine, (MI_NOOP));
>  
> -	intel_mark_page_flip_active(intel_crtc->unpin_work);
>  	return 0;
>  }
>  
> @@ -11182,9 +11188,6 @@ static bool use_mmio_flip(struct intel_engine_cs *engine,
>  	if (engine == NULL)
>  		return true;
>  
> -	if (INTEL_INFO(engine->dev)->gen < 5)
> -		return false;
> -
>  	if (i915.use_mmio_flip < 0)
>  		return false;
>  	else if (i915.use_mmio_flip > 0)
> @@ -11199,126 +11202,21 @@ static bool use_mmio_flip(struct intel_engine_cs *engine,
>  		return engine != i915_gem_request_get_engine(obj->last_write_req);
>  }
>  
> -static void skl_do_mmio_flip(struct intel_crtc *intel_crtc,
> -			     unsigned int rotation,
> -			     struct intel_unpin_work *work)
> -{
> -	struct drm_device *dev = intel_crtc->base.dev;
> -	struct drm_i915_private *dev_priv = dev->dev_private;
> -	struct drm_framebuffer *fb = intel_crtc->base.primary->fb;
> -	const enum pipe pipe = intel_crtc->pipe;
> -	u32 ctl, stride, tile_height;
> -
> -	ctl = I915_READ(PLANE_CTL(pipe, 0));
> -	ctl &= ~PLANE_CTL_TILED_MASK;
> -	switch (fb->modifier[0]) {
> -	case DRM_FORMAT_MOD_NONE:
> -		break;
> -	case I915_FORMAT_MOD_X_TILED:
> -		ctl |= PLANE_CTL_TILED_X;
> -		break;
> -	case I915_FORMAT_MOD_Y_TILED:
> -		ctl |= PLANE_CTL_TILED_Y;
> -		break;
> -	case I915_FORMAT_MOD_Yf_TILED:
> -		ctl |= PLANE_CTL_TILED_YF;
> -		break;
> -	default:
> -		MISSING_CASE(fb->modifier[0]);
> -	}
> -
> -	/*
> -	 * The stride is either expressed as a multiple of 64 bytes chunks for
> -	 * linear buffers or in number of tiles for tiled buffers.
> -	 */
> -	if (intel_rotation_90_or_270(rotation)) {
> -		/* stride = Surface height in tiles */
> -		tile_height = intel_tile_height(dev_priv, fb->modifier[0], 0);
> -		stride = DIV_ROUND_UP(fb->height, tile_height);
> -	} else {
> -		stride = fb->pitches[0] /
> -			intel_fb_stride_alignment(dev_priv, fb->modifier[0],
> -						  fb->pixel_format);
> -	}
> -
> -	/*
> -	 * Both PLANE_CTL and PLANE_STRIDE are not updated on vblank but on
> -	 * PLANE_SURF updates, the update is then guaranteed to be atomic.
> -	 */
> -	I915_WRITE(PLANE_CTL(pipe, 0), ctl);
> -	I915_WRITE(PLANE_STRIDE(pipe, 0), stride);
> -
> -	I915_WRITE(PLANE_SURF(pipe, 0), work->gtt_offset);
> -	POSTING_READ(PLANE_SURF(pipe, 0));
> -}
> -
> -static void ilk_do_mmio_flip(struct intel_crtc *intel_crtc,
> -			     struct intel_unpin_work *work)
> +static void intel_mmio_flip_work_func(struct work_struct *w)
>  {
> -	struct drm_device *dev = intel_crtc->base.dev;
> +	struct intel_flip_work *work =
> +		container_of(w, struct intel_flip_work, mmio_work);
> +	struct intel_crtc *crtc = to_intel_crtc(work->crtc);
> +	struct drm_device *dev = crtc->base.dev;
>  	struct drm_i915_private *dev_priv = dev->dev_private;
> -	struct intel_framebuffer *intel_fb =
> -		to_intel_framebuffer(intel_crtc->base.primary->fb);
> -	struct drm_i915_gem_object *obj = intel_fb->obj;
> -	i915_reg_t reg = DSPCNTR(intel_crtc->plane);
> -	u32 dspcntr;
> -
> -	dspcntr = I915_READ(reg);
> -
> -	if (obj->tiling_mode != I915_TILING_NONE)
> -		dspcntr |= DISPPLANE_TILED;
> -	else
> -		dspcntr &= ~DISPPLANE_TILED;
> -
> -	I915_WRITE(reg, dspcntr);
> +	struct intel_plane *primary = to_intel_plane(crtc->base.primary);
> +	struct drm_i915_gem_object *obj = intel_fb_obj(primary->base.state->fb);
>  
> -	I915_WRITE(DSPSURF(intel_crtc->plane), work->gtt_offset);
> -	POSTING_READ(DSPSURF(intel_crtc->plane));
> -}
> -
> -/*
> - * XXX: This is the temporary way to update the plane registers until we get
> - * around to using the usual plane update functions for MMIO flips
> - */
> -static void intel_do_mmio_flip(struct intel_mmio_flip *mmio_flip)
> -{
> -	struct intel_crtc *crtc = mmio_flip->crtc;
> -	struct intel_unpin_work *work;
> -
> -	spin_lock_irq(&crtc->base.dev->event_lock);
> -	work = crtc->unpin_work;
> -	spin_unlock_irq(&crtc->base.dev->event_lock);
> -	if (work == NULL)
> -		return;
> -
> -	intel_pipe_update_start(crtc);
> -
> -	if (INTEL_INFO(mmio_flip->i915)->gen >= 9)
> -		skl_do_mmio_flip(crtc, mmio_flip->rotation, work);
> -	else
> -		/* use_mmio_flip() retricts MMIO flips to ilk+ */
> -		ilk_do_mmio_flip(crtc, work);
> -
> -	intel_pipe_update_end(crtc);
> -
> -	intel_mark_page_flip_active(work);
> -}
> -
> -static void intel_mmio_flip_work_func(struct work_struct *work)
> -{
> -	struct intel_mmio_flip *mmio_flip =
> -		container_of(work, struct intel_mmio_flip, work);
> -	struct intel_framebuffer *intel_fb =
> -		to_intel_framebuffer(mmio_flip->crtc->base.primary->fb);
> -	struct drm_i915_gem_object *obj = intel_fb->obj;
> -
> -	if (mmio_flip->req) {
> -		WARN_ON(__i915_wait_request(mmio_flip->req,
> -					    mmio_flip->crtc->reset_counter,
> +	if (work->flip_queued_req)
> +		WARN_ON(__i915_wait_request(work->flip_queued_req,
> +					    crtc->reset_counter,
>  					    false, NULL,
> -					    &mmio_flip->i915->rps.mmioflips));
> -		i915_gem_request_unreference__unlocked(mmio_flip->req);
> -	}
> +					    &dev_priv->rps.mmioflips));
>  
>  	/* For framebuffer backed by dmabuf, wait for fence */
>  	if (obj->base.dma_buf)
> @@ -11326,29 +11224,12 @@ static void intel_mmio_flip_work_func(struct work_struct *work)
>  							    false, false,
>  							    MAX_SCHEDULE_TIMEOUT) < 0);
>  
> -	intel_do_mmio_flip(mmio_flip);
> -	kfree(mmio_flip);
> -}
> -
> -static int intel_queue_mmio_flip(struct drm_device *dev,
> -				 struct drm_crtc *crtc,
> -				 struct drm_i915_gem_object *obj)
> -{
> -	struct intel_mmio_flip *mmio_flip;
> -
> -	mmio_flip = kmalloc(sizeof(*mmio_flip), GFP_KERNEL);
> -	if (mmio_flip == NULL)
> -		return -ENOMEM;
> -
> -	mmio_flip->i915 = to_i915(dev);
> -	mmio_flip->req = i915_gem_request_reference(obj->last_write_req);
> -	mmio_flip->crtc = to_intel_crtc(crtc);
> -	mmio_flip->rotation = crtc->primary->state->rotation;
> -
> -	INIT_WORK(&mmio_flip->work, intel_mmio_flip_work_func);
> -	schedule_work(&mmio_flip->work);
> -
> -	return 0;
> +	intel_pipe_update_start(crtc);
> +	primary->update_plane(&primary->base,
> +			      crtc->config,
> +			      to_intel_plane_state(primary->base.state));
> +	atomic_set(&work->pending, INTEL_FLIP_PENDING);
> +	intel_pipe_update_end(crtc);
>  }
>  
>  static int intel_default_queue_flip(struct drm_device *dev,
> @@ -11366,7 +11247,7 @@ static bool __intel_pageflip_stall_check(struct drm_device *dev,
>  {
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> -	struct intel_unpin_work *work = intel_crtc->unpin_work;
> +	struct intel_flip_work *work = intel_crtc->flip_work;
>  	u32 addr;
>  	u32 pending;
>  
> @@ -11374,6 +11255,13 @@ static bool __intel_pageflip_stall_check(struct drm_device *dev,
>  	if (pending == INTEL_FLIP_INACTIVE)
>  		return false;
>  
> +	/*
> +	 * If this is a mmio flip return true because state
> +	 * is changed to INTEL_FLIP_PENDING after updating.
> +	 */
> +	if (is_mmio_work(work))
> +		return true;
> +
>  	if (work->flip_ready_vblank == 0) {
>  		if (work->flip_queued_req &&
>  		    !i915_gem_request_completed(work->flip_queued_req, true))
> @@ -11404,7 +11292,7 @@ void intel_check_page_flip(struct drm_device *dev, int pipe)
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
>  	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> -	struct intel_unpin_work *work;
> +	struct intel_flip_work *work;
>  
>  	WARN_ON(!in_interrupt());
>  
> @@ -11412,14 +11300,15 @@ void intel_check_page_flip(struct drm_device *dev, int pipe)
>  		return;
>  
>  	spin_lock(&dev->event_lock);
> -	work = intel_crtc->unpin_work;
> +	work = intel_crtc->flip_work;
>  	if (work != NULL && __intel_pageflip_stall_check(dev, crtc)) {
> -		WARN_ONCE(1, "Kicking stuck page flip: queued at %d, now %d\n",
> +		WARN_ONCE(!is_mmio_work(work),
> +			  "Kicking stuck page flip: queued at %d, now %d\n",
>  			 work->flip_queued_vblank, drm_vblank_count(dev, pipe));
>  		page_flip_completed(intel_crtc);
>  		work = NULL;
>  	}
> -	if (work != NULL &&
> +	if (work != NULL && !is_mmio_work(work) &&
>  	    drm_vblank_count(dev, pipe) - work->flip_queued_vblank > 1)
>  		intel_queue_rps_boost_for_request(dev, work->flip_queued_req);
>  	spin_unlock(&dev->event_lock);
> @@ -11437,7 +11326,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
>  	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
>  	struct drm_plane *primary = crtc->primary;
>  	enum pipe pipe = intel_crtc->pipe;
> -	struct intel_unpin_work *work;
> +	struct intel_flip_work *work;
>  	struct intel_engine_cs *engine;
>  	bool mmio_flip;
>  	struct drm_i915_gem_request *request = NULL;
> @@ -11474,19 +11363,20 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
>  	work->event = event;
>  	work->crtc = crtc;
>  	work->old_fb = old_fb;
> -	INIT_WORK(&work->work, intel_unpin_work_fn);
> +	INIT_WORK(&work->unpin_work, intel_unpin_work_fn);
>  
>  	ret = drm_crtc_vblank_get(crtc);
>  	if (ret)
>  		goto free_work;
>  
> -	/* We borrow the event spin lock for protecting unpin_work */
> +	/* We borrow the event spin lock for protecting flip_work */
>  	spin_lock_irq(&dev->event_lock);
> -	if (intel_crtc->unpin_work) {
> +	if (intel_crtc->flip_work) {
>  		/* Before declaring the flip queue wedged, check if
>  		 * the hardware completed the operation behind our backs.
>  		 */
> -		if (__intel_pageflip_stall_check(dev, crtc)) {
> +		if (!is_mmio_work(intel_crtc->flip_work) &&
> +		    __intel_pageflip_stall_check(dev, crtc)) {
>  			DRM_DEBUG_DRIVER("flip queue: previous flip completed, continuing\n");
>  			page_flip_completed(intel_crtc);
>  		} else {
> @@ -11498,7 +11388,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
>  			return -EBUSY;
>  		}
>  	}
> -	intel_crtc->unpin_work = work;
> +	intel_crtc->flip_work = work;
>  	spin_unlock_irq(&dev->event_lock);
>  
>  	if (atomic_read(&intel_crtc->unpin_work_count) >= 2)
> @@ -11567,23 +11457,22 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
>  	work->flip_queued_vblank = drm_crtc_vblank_count(crtc);
>  
>  	if (mmio_flip) {
> -		ret = intel_queue_mmio_flip(dev, crtc, obj);
> -		if (ret)
> -			goto cleanup_unpin;
> +		INIT_WORK(&work->mmio_work, intel_mmio_flip_work_func);
>  
>  		i915_gem_request_assign(&work->flip_queued_req,
>  					obj->last_write_req);
> +
> +		schedule_work(&work->mmio_work);
>  	} else {
> +		i915_gem_request_assign(&work->flip_queued_req, request);
>  		ret = dev_priv->display.queue_flip(dev, crtc, fb, obj, request,
>  						   page_flip_flags);
>  		if (ret)
>  			goto cleanup_unpin;
>  
> -		i915_gem_request_assign(&work->flip_queued_req, request);
> -	}
> -
> -	if (request)
> +		intel_mark_page_flip_active(work);
>  		i915_add_request_no_flush(request);
> +	}
>  
>  	work->flip_queued_vblank = drm_crtc_vblank_count(crtc);
>  
> @@ -11613,7 +11502,7 @@ cleanup:
>  	drm_framebuffer_unreference(work->old_fb);
>  
>  	spin_lock_irq(&dev->event_lock);
> -	intel_crtc->unpin_work = NULL;
> +	intel_crtc->flip_work = NULL;
>  	spin_unlock_irq(&dev->event_lock);
>  
>  	drm_crtc_vblank_put(crtc);
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index e26293ead94f..cac368138764 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -592,14 +592,6 @@ struct vlv_wm_state {
>  	bool cxsr;
>  };
>  
> -struct intel_mmio_flip {
> -	struct work_struct work;
> -	struct drm_i915_private *i915;
> -	struct drm_i915_gem_request *req;
> -	struct intel_crtc *crtc;
> -	unsigned int rotation;
> -};
> -
>  struct intel_crtc {
>  	struct drm_crtc base;
>  	enum pipe pipe;
> @@ -614,7 +606,7 @@ struct intel_crtc {
>  	unsigned long enabled_power_domains;
>  	bool lowfreq_avail;
>  	struct intel_overlay *overlay;
> -	struct intel_unpin_work *unpin_work;
> +	struct intel_flip_work *flip_work;
>  
>  	atomic_t unpin_work_count;
>  
> @@ -935,8 +927,10 @@ intel_get_crtc_for_plane(struct drm_device *dev, int plane)
>  	return dev_priv->plane_to_crtc_mapping[plane];
>  }
>  
> -struct intel_unpin_work {
> -	struct work_struct work;
> +struct intel_flip_work {
> +	struct work_struct unpin_work;
> +	struct work_struct mmio_work;
> +
>  	struct drm_crtc *crtc;
>  	struct drm_framebuffer *old_fb;
>  	struct drm_i915_gem_object *pending_flip_obj;
> -- 
> 2.1.0
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Ville Syrjälä
Intel OTC
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