Re: [Intel-gfx] [PATCH -v4 2/4] drm/i915: split intel_update_plane into check() and commit()

[Jani Nikula <jani.nikula@linux.intel.com>]

On Fri, 05 Sep 2014, Gustavo Padovan <gustavo@padovan.org> wrote:
> From: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
>
> Due to the upcoming atomic modesetting feature we need to separate
> some update functions into a check step that can fail and a commit
> step that should, ideally, never fail.
>
> This commit splits intel_update_plane() and its commit part can still
> fail due to the fb pinning procedure.

This patch regresses our tests:
https://bugs.freedesktop.org/show_bug.cgi?id=83747

BR,
Jani.


>
> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
> ---
>  drivers/gpu/drm/i915/intel_sprite.c | 233 ++++++++++++++++++++++--------------
>  1 file changed, 141 insertions(+), 92 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
> index 07a74ef..a4306cf 100644
> --- a/drivers/gpu/drm/i915/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/intel_sprite.c
> @@ -845,57 +845,24 @@ static bool colorkey_enabled(struct intel_plane *intel_plane)
>  }
>  
>  static int
> -intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
> -		   struct drm_framebuffer *fb, int crtc_x, int crtc_y,
> -		   unsigned int crtc_w, unsigned int crtc_h,
> -		   uint32_t src_x, uint32_t src_y,
> -		   uint32_t src_w, uint32_t src_h)
> +intel_check_sprite_plane(struct drm_plane *plane,
> +			 struct intel_plane_state *state)
>  {
> -	struct drm_device *dev = plane->dev;
> -	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> +	struct intel_crtc *intel_crtc = to_intel_crtc(state->crtc);
>  	struct intel_plane *intel_plane = to_intel_plane(plane);
> -	enum pipe pipe = intel_crtc->pipe;
> +	struct drm_framebuffer *fb = state->fb;
>  	struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
>  	struct drm_i915_gem_object *obj = intel_fb->obj;
> -	struct drm_i915_gem_object *old_obj = intel_plane->obj;
> -	int ret;
> -	bool primary_enabled;
> -	bool visible;
> +	int crtc_x, crtc_y;
> +	unsigned int crtc_w, crtc_h;
> +	uint32_t src_x, src_y, src_w, src_h;
> +	struct drm_rect *src = &state->src;
> +	struct drm_rect *dst = &state->dst;
> +	struct drm_rect *orig_src = &state->orig_src;
> +	const struct drm_rect *clip = &state->clip;
>  	int hscale, vscale;
>  	int max_scale, min_scale;
>  	int pixel_size = drm_format_plane_cpp(fb->pixel_format, 0);
> -	struct drm_rect src = {
> -		/* sample coordinates in 16.16 fixed point */
> -		.x1 = src_x,
> -		.x2 = src_x + src_w,
> -		.y1 = src_y,
> -		.y2 = src_y + src_h,
> -	};
> -	struct drm_rect dst = {
> -		/* integer pixels */
> -		.x1 = crtc_x,
> -		.x2 = crtc_x + crtc_w,
> -		.y1 = crtc_y,
> -		.y2 = crtc_y + crtc_h,
> -	};
> -	const struct drm_rect clip = {
> -		.x2 = intel_crtc->active ? intel_crtc->config.pipe_src_w : 0,
> -		.y2 = intel_crtc->active ? intel_crtc->config.pipe_src_h : 0,
> -	};
> -	const struct {
> -		int crtc_x, crtc_y;
> -		unsigned int crtc_w, crtc_h;
> -		uint32_t src_x, src_y, src_w, src_h;
> -	} orig = {
> -		.crtc_x = crtc_x,
> -		.crtc_y = crtc_y,
> -		.crtc_w = crtc_w,
> -		.crtc_h = crtc_h,
> -		.src_x = src_x,
> -		.src_y = src_y,
> -		.src_w = src_w,
> -		.src_h = src_h,
> -	};
>  
>  	/* Don't modify another pipe's plane */
>  	if (intel_plane->pipe != intel_crtc->pipe) {
> @@ -927,55 +894,55 @@ intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
>  	max_scale = intel_plane->max_downscale << 16;
>  	min_scale = intel_plane->can_scale ? 1 : (1 << 16);
>  
> -	drm_rect_rotate(&src, fb->width << 16, fb->height << 16,
> +	drm_rect_rotate(src, fb->width << 16, fb->height << 16,
>  			intel_plane->rotation);
>  
> -	hscale = drm_rect_calc_hscale_relaxed(&src, &dst, min_scale, max_scale);
> +	hscale = drm_rect_calc_hscale_relaxed(src, dst, min_scale, max_scale);
>  	BUG_ON(hscale < 0);
>  
> -	vscale = drm_rect_calc_vscale_relaxed(&src, &dst, min_scale, max_scale);
> +	vscale = drm_rect_calc_vscale_relaxed(src, dst, min_scale, max_scale);
>  	BUG_ON(vscale < 0);
>  
> -	visible = drm_rect_clip_scaled(&src, &dst, &clip, hscale, vscale);
> +	state->visible =  drm_rect_clip_scaled(src, dst, clip, hscale, vscale);
>  
> -	crtc_x = dst.x1;
> -	crtc_y = dst.y1;
> -	crtc_w = drm_rect_width(&dst);
> -	crtc_h = drm_rect_height(&dst);
> +	crtc_x = dst->x1;
> +	crtc_y = dst->y1;
> +	crtc_w = drm_rect_width(dst);
> +	crtc_h = drm_rect_height(dst);
>  
> -	if (visible) {
> +	if (state->visible) {
>  		/* check again in case clipping clamped the results */
> -		hscale = drm_rect_calc_hscale(&src, &dst, min_scale, max_scale);
> +		hscale = drm_rect_calc_hscale(src, dst, min_scale, max_scale);
>  		if (hscale < 0) {
>  			DRM_DEBUG_KMS("Horizontal scaling factor out of limits\n");
> -			drm_rect_debug_print(&src, true);
> -			drm_rect_debug_print(&dst, false);
> +			drm_rect_debug_print(src, true);
> +			drm_rect_debug_print(dst, false);
>  
>  			return hscale;
>  		}
>  
> -		vscale = drm_rect_calc_vscale(&src, &dst, min_scale, max_scale);
> +		vscale = drm_rect_calc_vscale(src, dst, min_scale, max_scale);
>  		if (vscale < 0) {
>  			DRM_DEBUG_KMS("Vertical scaling factor out of limits\n");
> -			drm_rect_debug_print(&src, true);
> -			drm_rect_debug_print(&dst, false);
> +			drm_rect_debug_print(src, true);
> +			drm_rect_debug_print(dst, false);
>  
>  			return vscale;
>  		}
>  
>  		/* Make the source viewport size an exact multiple of the scaling factors. */
> -		drm_rect_adjust_size(&src,
> -				     drm_rect_width(&dst) * hscale - drm_rect_width(&src),
> -				     drm_rect_height(&dst) * vscale - drm_rect_height(&src));
> +		drm_rect_adjust_size(src,
> +				     drm_rect_width(dst) * hscale - drm_rect_width(src),
> +				     drm_rect_height(dst) * vscale - drm_rect_height(src));
>  
> -		drm_rect_rotate_inv(&src, fb->width << 16, fb->height << 16,
> +		drm_rect_rotate_inv(src, fb->width << 16, fb->height << 16,
>  				    intel_plane->rotation);
>  
>  		/* sanity check to make sure the src viewport wasn't enlarged */
> -		WARN_ON(src.x1 < (int) src_x ||
> -			src.y1 < (int) src_y ||
> -			src.x2 > (int) (src_x + src_w) ||
> -			src.y2 > (int) (src_y + src_h));
> +		WARN_ON(src->x1 < (int) orig_src->x1 ||
> +			src->y1 < (int) orig_src->y1 ||
> +			src->x2 > (int) orig_src->x2 ||
> +			src->y2 > (int) orig_src->y2);
>  
>  		/*
>  		 * Hardware doesn't handle subpixel coordinates.
> @@ -983,10 +950,10 @@ intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
>  		 * increase the source viewport size, because that could
>  		 * push the downscaling factor out of bounds.
>  		 */
> -		src_x = src.x1 >> 16;
> -		src_w = drm_rect_width(&src) >> 16;
> -		src_y = src.y1 >> 16;
> -		src_h = drm_rect_height(&src) >> 16;
> +		src_x = src->x1 >> 16;
> +		src_w = drm_rect_width(src) >> 16;
> +		src_y = src->y1 >> 16;
> +		src_h = drm_rect_height(src) >> 16;
>  
>  		if (format_is_yuv(fb->pixel_format)) {
>  			src_x &= ~1;
> @@ -1000,12 +967,12 @@ intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
>  				crtc_w &= ~1;
>  
>  			if (crtc_w == 0)
> -				visible = false;
> +				state->visible = false;
>  		}
>  	}
>  
>  	/* Check size restrictions when scaling */
> -	if (visible && (src_w != crtc_w || src_h != crtc_h)) {
> +	if (state->visible && (src_w != crtc_w || src_h != crtc_h)) {
>  		unsigned int width_bytes;
>  
>  		WARN_ON(!intel_plane->can_scale);
> @@ -1013,12 +980,13 @@ intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
>  		/* FIXME interlacing min height is 6 */
>  
>  		if (crtc_w < 3 || crtc_h < 3)
> -			visible = false;
> +			state->visible = false;
>  
>  		if (src_w < 3 || src_h < 3)
> -			visible = false;
> +			state->visible = false;
>  
> -		width_bytes = ((src_x * pixel_size) & 63) + src_w * pixel_size;
> +		width_bytes = ((src_x * pixel_size) & 63) +
> +					src_w * pixel_size;
>  
>  		if (src_w > 2048 || src_h > 2048 ||
>  		    width_bytes > 4096 || fb->pitches[0] > 4096) {
> @@ -1027,17 +995,48 @@ intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
>  		}
>  	}
>  
> -	dst.x1 = crtc_x;
> -	dst.x2 = crtc_x + crtc_w;
> -	dst.y1 = crtc_y;
> -	dst.y2 = crtc_y + crtc_h;
> +	if (state->visible) {
> +		src->x1 = src_x;
> +		src->x2 = src_x + src_w;
> +		src->y1 = src_y;
> +		src->y2 = src_y + src_h;
> +	}
> +
> +	dst->x1 = crtc_x;
> +	dst->x2 = crtc_x + crtc_w;
> +	dst->y1 = crtc_y;
> +	dst->y2 = crtc_y + crtc_h;
> +
> +	return 0;
> +}
> +
> +static int
> +intel_commit_sprite_plane(struct drm_plane *plane,
> +			  struct intel_plane_state *state)
> +{
> +	struct drm_device *dev = plane->dev;
> +	struct drm_crtc *crtc = state->crtc;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> +	struct intel_plane *intel_plane = to_intel_plane(plane);
> +	enum pipe pipe = intel_crtc->pipe;
> +	struct drm_framebuffer *fb = state->fb;
> +	struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
> +	struct drm_i915_gem_object *obj = intel_fb->obj;
> +	struct drm_i915_gem_object *old_obj = intel_plane->obj;
> +	int crtc_x, crtc_y;
> +	unsigned int crtc_w, crtc_h;
> +	uint32_t src_x, src_y, src_w, src_h;
> +	struct drm_rect *dst = &state->dst;
> +	const struct drm_rect *clip = &state->clip;
> +	bool primary_enabled;
> +	int ret;
>  
>  	/*
>  	 * If the sprite is completely covering the primary plane,
>  	 * we can disable the primary and save power.
>  	 */
> -	primary_enabled = !drm_rect_equals(&dst, &clip) || colorkey_enabled(intel_plane);
> -	WARN_ON(!primary_enabled && !visible && intel_crtc->active);
> +	primary_enabled = !drm_rect_equals(dst, clip) || colorkey_enabled(intel_plane);
> +	WARN_ON(!primary_enabled && !state->visible && intel_crtc->active);
>  
>  	mutex_lock(&dev->struct_mutex);
>  
> @@ -1055,14 +1054,14 @@ intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
>  	if (ret)
>  		return ret;
>  
> -	intel_plane->crtc_x = orig.crtc_x;
> -	intel_plane->crtc_y = orig.crtc_y;
> -	intel_plane->crtc_w = orig.crtc_w;
> -	intel_plane->crtc_h = orig.crtc_h;
> -	intel_plane->src_x = orig.src_x;
> -	intel_plane->src_y = orig.src_y;
> -	intel_plane->src_w = orig.src_w;
> -	intel_plane->src_h = orig.src_h;
> +	intel_plane->crtc_x = state->orig_dst.x1;
> +	intel_plane->crtc_y = state->orig_dst.y1;
> +	intel_plane->crtc_w = drm_rect_width(&state->orig_dst);
> +	intel_plane->crtc_h = drm_rect_height(&state->orig_dst);
> +	intel_plane->src_x = state->orig_src.x1;
> +	intel_plane->src_y = state->orig_src.y1;
> +	intel_plane->src_w = drm_rect_width(&state->orig_src);
> +	intel_plane->src_h = drm_rect_height(&state->orig_src);
>  	intel_plane->obj = obj;
>  
>  	if (intel_crtc->active) {
> @@ -1076,12 +1075,22 @@ intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
>  		if (primary_was_enabled && !primary_enabled)
>  			intel_pre_disable_primary(crtc);
>  
> -		if (visible)
> +		if (state->visible) {
> +			crtc_x = state->dst.x1;
> +			crtc_y = state->dst.x2;
> +			crtc_w = drm_rect_width(&state->dst);
> +			crtc_h = drm_rect_height(&state->dst);
> +			src_x = state->src.x1;
> +			src_y = state->src.y1;
> +			src_w = drm_rect_width(&state->src);
> +			src_h = drm_rect_height(&state->src);
>  			intel_plane->update_plane(plane, crtc, fb, obj,
>  						  crtc_x, crtc_y, crtc_w, crtc_h,
>  						  src_x, src_y, src_w, src_h);
> -		else
> +		} else {
>  			intel_plane->disable_plane(plane, crtc);
> +		}
> +
>  
>  		intel_frontbuffer_flip(dev, INTEL_FRONTBUFFER_SPRITE(pipe));
>  
> @@ -1109,6 +1118,46 @@ intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
>  }
>  
>  static int
> +intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
> +		   struct drm_framebuffer *fb, int crtc_x, int crtc_y,
> +		   unsigned int crtc_w, unsigned int crtc_h,
> +		   uint32_t src_x, uint32_t src_y,
> +		   uint32_t src_w, uint32_t src_h)
> +{
> +	struct intel_plane_state state;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> +	int ret;
> +
> +	state.crtc = crtc;
> +	state.fb = fb;
> +
> +	/* sample coordinates in 16.16 fixed point */
> +	state.src.x1 = src_x;
> +	state.src.x2 = src_x + src_w;
> +	state.src.y1 = src_y;
> +	state.src.y2 = src_y + src_h;
> +
> +	/* integer pixels */
> +	state.dst.x1 = crtc_x;
> +	state.dst.x2 = crtc_x + crtc_w;
> +	state.dst.y1 = crtc_y;
> +	state.dst.y2 = crtc_y + crtc_h;
> +
> +	state.clip.x1 = 0;
> +	state.clip.y1 = 0;
> +	state.clip.x2 = intel_crtc->active ? intel_crtc->config.pipe_src_w : 0;
> +	state.clip.y2 = intel_crtc->active ? intel_crtc->config.pipe_src_h : 0;
> +	state.orig_src = state.src;
> +	state.orig_dst = state.dst;
> +
> +	ret = intel_check_sprite_plane(plane, &state);
> +	if (ret)
> +		return ret;
> +
> +	return intel_commit_sprite_plane(plane, &state);
> +}
> +
> +static int
>  intel_disable_plane(struct drm_plane *plane)
>  {
>  	struct drm_device *dev = plane->dev;
> -- 
> 1.9.3
>
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-- 
Jani Nikula, Intel Open Source Technology Center