Re: [PATCH v6 1/4] drm: add generic zpos property

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On Thu, Jul 21, 2016 at 10:52:00AM +0200, Benjamin Gaignard wrote:
> From: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> 
> version 6:
> - add zpos in gpu documentation file
> - merge Ville patch about zpos initial value and API improvement.
>   I have split Ville patch between zpos core and drivers
> 
> version 5:
> - remove zpos range check and comeback to 0 to N-1
>   normalization algorithm
> 
> version 4:
> - make sure that normalized zpos value is stay
>   in the defined property range and warn user if not
> 
> This patch adds support for generic plane's zpos property property with
> well-defined semantics:
> - added zpos properties to plane and plane state structures
> - added helpers for normalizing zpos properties of given set of planes
> - well defined semantics: planes are sorted by zpos values and then plane
>   id value if zpos equals
> 
> Normalized zpos values are calculated automatically when generic
> muttable zpos property has been initialized. Drivers can simply use
> plane_state->normalized_zpos in their atomic_check and/or plane_update
> callbacks without any additional calls to DRM core.
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> 
> Compare to Marek's original patch zpos property is now specific to each
> plane and no more to the core.
> Normalize function take care of the range of per plane defined range
> before set normalized_zpos.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxx>
> 
> Cc: Inki Dae <inki.dae@xxxxxxxxxxx>
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> Cc: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>
> Cc: Seung-Woo Kim <sw0312.kim@xxxxxxxxxxx>
> Cc: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
> Cc: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
> Cc: Tobias Jakobi <tjakobi@xxxxxxxxxxxxxxxxxxxxx>
> Cc: Gustavo Padovan <gustavo@xxxxxxxxxxx>
> Cc: vincent.abriou@xxxxxx
> Cc: fabien.dessenne@xxxxxx
> Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> ---
>  Documentation/gpu/kms-properties.csv |   1 +
>  drivers/gpu/drm/Makefile             |   2 +-
>  drivers/gpu/drm/drm_atomic.c         |   4 +
>  drivers/gpu/drm/drm_atomic_helper.c  |   7 +
>  drivers/gpu/drm/drm_blend.c          | 240 +++++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/drm_crtc_internal.h  |   4 +
>  include/drm/drm_crtc.h               |  30 +++++
>  7 files changed, 287 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/gpu/drm/drm_blend.c
> 
> diff --git a/Documentation/gpu/kms-properties.csv b/Documentation/gpu/kms-properties.csv
> index b6fcaf6..3587ea2 100644
> --- a/Documentation/gpu/kms-properties.csv
> +++ b/Documentation/gpu/kms-properties.csv
> @@ -17,6 +17,7 @@ DRM,Generic,“rotation”,BITMASK,"{ 0, ""rotate-0"" }, { 1, ""rotate-90"" }, {
>  ,,“CRTC_H”,RANGE,"Min=0, Max=UINT_MAX",Plane,Scanout CRTC (destination) height (atomic)
>  ,,“FB_ID”,OBJECT,DRM_MODE_OBJECT_FB,Plane,Scanout framebuffer (atomic)
>  ,,“CRTC_ID”,OBJECT,DRM_MODE_OBJECT_CRTC,Plane,CRTC that plane is attached to (atomic)
> +,,“zpos”,RANGE,"Min=0, Max=UINT_MAX",Plane,Zorder of the plane
>  ,DVI-I,“subconnector”,ENUM,"{ “Unknown”, “DVI-D”, “DVI-A” }",Connector,TBD
>  ,,“select subconnector”,ENUM,"{ “Automatic”, “DVI-D”, “DVI-A” }",Connector,TBD
>  ,TV,“subconnector”,ENUM,"{ ""Unknown"", ""Composite"", ""SVIDEO"", ""Component"", ""SCART"" }",Connector,TBD
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index e3dba6f..7fbcf3f 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -2,7 +2,7 @@
>  # Makefile for the drm device driver.  This driver provides support for the
>  # Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
>  
> -drm-y       :=	drm_auth.o drm_bufs.o drm_cache.o \
> +drm-y       :=	drm_auth.o drm_bufs.o drm_blend.o drm_cache.o \
>  		drm_context.o drm_dma.o \
>  		drm_fops.o drm_gem.o drm_ioctl.o drm_irq.o \
>  		drm_lock.o drm_memory.o drm_drv.o drm_vm.o \
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index 9359be4..8ddd8bc 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -712,6 +712,8 @@ int drm_atomic_plane_set_property(struct drm_plane *plane,
>  		state->src_h = val;
>  	} else if (property == config->rotation_property) {
>  		state->rotation = val;
> +	} else if (property == plane->zpos_property) {
> +		state->zpos = val;
>  	} else if (plane->funcs->atomic_set_property) {
>  		return plane->funcs->atomic_set_property(plane, state,
>  				property, val);
> @@ -768,6 +770,8 @@ drm_atomic_plane_get_property(struct drm_plane *plane,
>  		*val = state->src_h;
>  	} else if (property == config->rotation_property) {
>  		*val = state->rotation;
> +	} else if (property == plane->zpos_property) {
> +		*val = state->zpos;
>  	} else if (plane->funcs->atomic_get_property) {
>  		return plane->funcs->atomic_get_property(plane, state, property, val);
>  	} else {
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index de7fddc..20be86d 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -32,6 +32,8 @@
>  #include <drm/drm_atomic_helper.h>
>  #include <linux/fence.h>
>  
> +#include "drm_crtc_internal.h"
> +
>  /**
>   * DOC: overview
>   *
> @@ -592,6 +594,10 @@ drm_atomic_helper_check_planes(struct drm_device *dev,
>  	struct drm_plane_state *plane_state;
>  	int i, ret = 0;
>  
> +	ret = drm_atomic_helper_normalize_zpos(dev, state);
> +	if (ret)
> +		return ret;
> +
>  	for_each_plane_in_state(state, plane, plane_state, i) {
>  		const struct drm_plane_helper_funcs *funcs;
>  
> @@ -2955,6 +2961,7 @@ void __drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc,
>  	state->planes_changed = false;
>  	state->connectors_changed = false;
>  	state->color_mgmt_changed = false;
> +	state->zpos_changed = false;
>  	state->event = NULL;
>  }
>  EXPORT_SYMBOL(__drm_atomic_helper_crtc_duplicate_state);
> diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c
> new file mode 100644
> index 0000000..9567233
> --- /dev/null
> +++ b/drivers/gpu/drm/drm_blend.c
> @@ -0,0 +1,240 @@
> +/*
> + * Copyright (C) 2016 Samsung Electronics Co.Ltd
> + * Authors:
> + *	Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> + *
> + * DRM core plane blending related functions
> + *
> + * Permission to use, copy, modify, distribute, and sell this software and its
> + * documentation for any purpose is hereby granted without fee, provided that
> + * the above copyright notice appear in all copies and that both that copyright
> + * notice and this permission notice appear in supporting documentation, and
> + * that the name of the copyright holders not be used in advertising or
> + * publicity pertaining to distribution of the software without specific,
> + * written prior permission.  The copyright holders make no representations
> + * about the suitability of this software for any purpose.  It is provided "as
> + * is" without express or implied warranty.
> + *
> + * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
> + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
> + * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
> + * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
> + * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
> + * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
> + * OF THIS SOFTWARE.
> + */
> +#include <drm/drmP.h>
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_crtc.h>
> +#include <linux/export.h>
> +#include <linux/slab.h>
> +#include <linux/sort.h>
> +
> +#include "drm_internal.h"
> +
> +/**
> + * drm_plane_create_zpos_property - create mutable zpos property
> + * @plane: drm plane
> + * @zpos: initial value of zpos property
> + * @min: minimal possible value of zpos property
> + * @max: maximal possible value of zpos property
> + *
> + * This function initializes generic mutable zpos property and enables support
> + * for it in drm core. Drivers can then attach this property to planes to enable
> + * support for configurable planes arrangement during blending operation.
> + * Once mutable zpos property has been enabled, the DRM core will automatically
> + * calculate drm_plane_state->normalized_zpos values. Usually min should be set
> + * to 0 and max to maximal number of planes for given crtc - 1.
> + *
> + * If zpos of some planes cannot be changed (like fixed background or
> + * cursor/topmost planes), driver should adjust min/max values and assign those
> + * planes immutable zpos property with lower or higher values (for more
> + * information, see drm_mode_create_zpos_immutable_property() function). In such
> + * case driver should also assign proper initial zpos values for all planes in
> + * its plane_reset() callback, so the planes will be always sorted properly.
> + *
> + * Returns:
> + * Zero on success, negative errno on failure.
> + */
> +int drm_plane_create_zpos_property(struct drm_plane *plane,
> +				   unsigned int zpos,
> +				   unsigned int min, unsigned int max)
> +{
> +	struct drm_property *prop;
> +
> +	prop = drm_property_create_range(plane->dev, 0, "zpos", min, max);
> +	if (!prop)
> +		return -ENOMEM;
> +
> +	drm_object_attach_property(&plane->base, prop, zpos);
> +
> +	plane->zpos_property = prop;
> +
> +	if (plane->state) {
> +		plane->state->zpos = zpos;
> +		plane->state->normalized_zpos = zpos;
> +	}
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(drm_plane_create_zpos_property);
> +
> +/**
> + * drm_plane_create_zpos_immutable_property - create immuttable zpos property
> + * @plane: drm plane
> + * @zpos: value of zpos property
> + *
> + * This function initializes generic immutable zpos property and enables
> + * support for it in drm core. Using this property driver lets userspace
> + * to get the arrangement of the planes for blending operation and notifies
> + * it that the hardware (or driver) doesn't support changing of the planes'
> + * order.
> + *
> + * Returns:
> + * Zero on success, negative errno on failure.
> + */
> +int drm_plane_create_zpos_immutable_property(struct drm_plane *plane,
> +					     unsigned int zpos)
> +{
> +	struct drm_property *prop;
> +
> +	prop = drm_property_create_range(plane->dev, DRM_MODE_PROP_IMMUTABLE,
> +					 "zpos", zpos, zpos);
> +	if (!prop)
> +		return -ENOMEM;
> +
> +	drm_object_attach_property(&plane->base, prop, zpos);
> +
> +	plane->zpos_property = prop;
> +
> +	if (plane->state) {
> +		plane->state->zpos = zpos;
> +		plane->state->normalized_zpos = zpos;
> +	}
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(drm_plane_create_zpos_immutable_property);
> +
> +static int drm_atomic_state_zpos_cmp(const void *a, const void *b)
> +{
> +	const struct drm_plane_state *sa = *(struct drm_plane_state **)a;
> +	const struct drm_plane_state *sb = *(struct drm_plane_state **)b;

*(const struct drm_plane_state * const *)

if you want to be more anal about the cast, I suppose.

> +
> +	if (sa->zpos != sb->zpos)
> +		return sa->zpos - sb->zpos;
> +	else
> +		return sa->plane->base.id - sb->plane->base.id;
> +}

I might have wished that we'd be a bit more strict here (at least for
the atomic API), but if people want this I can live with it.

> +
> +/**
> + * drm_atomic_helper_crtc_normalize_zpos - calculate normalized zpos values
> + * @crtc: crtc with planes, which have to be considered for normalization
> + * @crtc_state: new atomic state to apply
> + *
> + * This function checks new states of all planes assigned to given crtc and
> + * calculates normalized zpos value for them. Planes are compared first by their
> + * zpos values, then by plane id (if zpos equals). Plane with lowest zpos value
> + * is at the bottom. The plane_state->normalized_zpos is then filled with unique
> + * values from 0 to number of active planes in crtc minus one.
> + *
> + * RETURNS
> + * Zero for success or -errno
> + */
> +int drm_atomic_helper_crtc_normalize_zpos(struct drm_crtc *crtc,

static + kill EXPORT ?

Anyways, this seemed sufficient for i915, so I toss in my
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>

> +					  struct drm_crtc_state *crtc_state)
> +{
> +	struct drm_atomic_state *state = crtc_state->state;
> +	struct drm_device *dev = crtc->dev;
> +	int total_planes = dev->mode_config.num_total_plane;
> +	struct drm_plane_state **states;
> +	struct drm_plane *plane;
> +	int i, n = 0;
> +	int ret = 0;
> +
> +	DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n",
> +			 crtc->base.id, crtc->name);
> +
> +	states = kmalloc_array(total_planes, sizeof(*states), GFP_TEMPORARY);
> +	if (!states)
> +		return -ENOMEM;
> +
> +	/*
> +	 * Normalization process might create new states for planes which
> +	 * normalized_zpos has to be recalculated.
> +	 */
> +	drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) {
> +		struct drm_plane_state *plane_state =
> +			drm_atomic_get_plane_state(state, plane);
> +		if (IS_ERR(plane_state)) {
> +			ret = PTR_ERR(plane_state);
> +			goto done;
> +		}
> +		states[n++] = plane_state;
> +		DRM_DEBUG_ATOMIC("[PLANE:%d:%s] processing zpos value %d\n",
> +				 plane->base.id, plane->name,
> +				 plane_state->zpos);
> +	}
> +
> +	sort(states, n, sizeof(*states), drm_atomic_state_zpos_cmp, NULL);
> +
> +	for (i = 0; i < n; i++) {
> +		plane = states[i]->plane;
> +
> +		states[i]->normalized_zpos = i;
> +		DRM_DEBUG_ATOMIC("[PLANE:%d:%s] normalized zpos value %d\n",
> +				 plane->base.id, plane->name, i);
> +	}
> +	crtc_state->zpos_changed = true;
> +
> +done:
> +	kfree(states);
> +	return ret;
> +}
> +EXPORT_SYMBOL(drm_atomic_helper_crtc_normalize_zpos);
> +
> +/**
> + * drm_atomic_helper_normalize_zpos - calculate normalized zpos values for all
> + *				      crtcs
> + * @dev: DRM device
> + * @state: atomic state of DRM device
> + *
> + * This function calculates normalized zpos value for all modified planes in
> + * the provided atomic state of DRM device. For more information, see
> + * drm_atomic_helper_crtc_normalize_zpos() function.
> + *
> + * RETURNS
> + * Zero for success or -errno
> + */
> +int drm_atomic_helper_normalize_zpos(struct drm_device *dev,
> +				     struct drm_atomic_state *state)
> +{
> +	struct drm_crtc *crtc;
> +	struct drm_crtc_state *crtc_state;
> +	struct drm_plane *plane;
> +	struct drm_plane_state *plane_state;
> +	int i, ret = 0;
> +
> +	for_each_plane_in_state(state, plane, plane_state, i) {
> +		crtc = plane_state->crtc;
> +		if (!crtc)
> +			continue;
> +		if (plane->state->zpos != plane_state->zpos) {
> +			crtc_state =
> +				drm_atomic_get_existing_crtc_state(state, crtc);
> +			crtc_state->zpos_changed = true;
> +		}
> +	}
> +
> +	for_each_crtc_in_state(state, crtc, crtc_state, i) {
> +		if (crtc_state->plane_mask != crtc->state->plane_mask ||
> +		    crtc_state->zpos_changed) {
> +			ret = drm_atomic_helper_crtc_normalize_zpos(crtc,
> +								    crtc_state);
> +			if (ret)
> +				return ret;
> +		}
> +	}
> +	return 0;
> +}
> +EXPORT_SYMBOL(drm_atomic_helper_normalize_zpos);
> diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h
> index b248e22..3ea72e1 100644
> --- a/drivers/gpu/drm/drm_crtc_internal.h
> +++ b/drivers/gpu/drm/drm_crtc_internal.h
> @@ -129,3 +129,7 @@ int drm_atomic_remove_fb(struct drm_framebuffer *fb);
>  
>  int drm_modeset_register_all(struct drm_device *dev);
>  void drm_modeset_unregister_all(struct drm_device *dev);
> +
> +/* drm_blend.c */
> +int drm_atomic_helper_normalize_zpos(struct drm_device *dev,
> +				     struct drm_atomic_state *state);
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index 9e6ab4a..69c2092 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -308,6 +308,7 @@ struct drm_plane_helper_funcs;
>   * @mode_changed: crtc_state->mode or crtc_state->enable has been changed
>   * @active_changed: crtc_state->active has been toggled.
>   * @connectors_changed: connectors to this crtc have been updated
> + * @zpos_changed: zpos values of planes on this crtc have been updated
>   * @color_mgmt_changed: color management properties have changed (degamma or
>   *	gamma LUT or CSC matrix)
>   * @plane_mask: bitmask of (1 << drm_plane_index(plane)) of attached planes
> @@ -344,6 +345,7 @@ struct drm_crtc_state {
>  	bool mode_changed : 1;
>  	bool active_changed : 1;
>  	bool connectors_changed : 1;
> +	bool zpos_changed : 1;
>  	bool color_mgmt_changed : 1;
>  
>  	/* attached planes bitmask:
> @@ -1396,6 +1398,9 @@ struct drm_connector {
>   * @src_w: width of visible portion of plane (in 16.16)
>   * @src_h: height of visible portion of plane (in 16.16)
>   * @rotation: rotation of the plane
> + * @zpos: priority of the given plane on crtc (optional)
> + * @normalized_zpos: normalized value of zpos: unique, range from 0 to N-1
> + *	 for given crtc
>   * @state: backpointer to global drm_atomic_state
>   */
>  struct drm_plane_state {
> @@ -1416,6 +1421,10 @@ struct drm_plane_state {
>  	/* Plane rotation */
>  	unsigned int rotation;
>  
> +	/* Plane zpos */
> +	unsigned int zpos;
> +	unsigned int normalized_zpos;
> +
>  	struct drm_atomic_state *state;
>  };
>  
> @@ -1675,6 +1684,7 @@ enum drm_plane_type {
>   * @properties: property tracking for this plane
>   * @type: type of plane (overlay, primary, cursor)
>   * @state: current atomic state for this plane
> + * @zpos_property: zpos property for this plane
>   * @helper_private: mid-layer private data
>   */
>  struct drm_plane {
> @@ -1716,6 +1726,8 @@ struct drm_plane {
>  	const struct drm_plane_helper_funcs *helper_private;
>  
>  	struct drm_plane_state *state;
> +
> +	struct drm_property *zpos_property;
>  };
>  
>  /**
> @@ -2774,6 +2786,24 @@ extern void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
>  				       uint degamma_lut_size,
>  				       bool has_ctm,
>  				       uint gamma_lut_size);
> +
> +int drm_plane_atomic_set_zpos_property(struct drm_plane *plane,
> +				       struct drm_plane_state *state,
> +				       struct drm_property *property,
> +				       uint64_t val);
> +
> +int drm_plane_atomic_get_zpos_property(struct drm_plane *plane,
> +				       const struct drm_plane_state *state,
> +				       struct drm_property *property,
> +				       uint64_t *val);
> +
> +int drm_plane_create_zpos_property(struct drm_plane *plane,
> +				   unsigned int zpos,
> +				   unsigned int min, unsigned int max);
> +
> +int drm_plane_create_zpos_immutable_property(struct drm_plane *plane,
> +					     unsigned int zpos);
> +
>  /* Helpers */
>  struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
>  					     uint32_t id, uint32_t type);
> -- 
> 1.9.1

-- 
Ville Syrjälä
Intel OTC
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