Re: [RFC PATCH 02/10] drm/colorop: Introduce new drm_colorop mode object

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On 2023-10-10 12:19, Melissa Wen wrote:
> On 09/08, Harry Wentland wrote:
>> This patches introduces a new drm_colorop mode object. This
>> object represents color transformations and can be used to
>> define color pipelines.
>>
>> We also introduce the drm_colorop_state here, as well as
>> various helpers and state tracking bits.
>>
>> Signed-off-by: Harry Wentland <harry.wentland@xxxxxxx>
>> Cc: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
>> Cc: Pekka Paalanen <pekka.paalanen@xxxxxxxxxxxxx>
>> Cc: Simon Ser <contact@xxxxxxxxxxx>
>> Cc: Harry Wentland <harry.wentland@xxxxxxx>
>> Cc: Melissa Wen <mwen@xxxxxxxxxx>
>> Cc: Jonas Ådahl <jadahl@xxxxxxxxxx>
>> Cc: Sebastian Wick <sebastian.wick@xxxxxxxxxx>
>> Cc: Shashank Sharma <shashank.sharma@xxxxxxx>
>> Cc: Alexander Goins <agoins@xxxxxxxxxx>
>> Cc: Joshua Ashton <joshua@xxxxxxxxx>
>> Cc: Michel Dänzer <mdaenzer@xxxxxxxxxx>
>> Cc: Aleix Pol <aleixpol@xxxxxxx>
>> Cc: Xaver Hugl <xaver.hugl@xxxxxxxxx>
>> Cc: Victoria Brekenfeld <victoria@xxxxxxxxxxxx>
>> Cc: Daniel Vetter <daniel@xxxxxxxx>
>> Cc: Uma Shankar <uma.shankar@xxxxxxxxx>
>> Cc: Naseer Ahmed <quic_naseer@xxxxxxxxxxx>
>> Cc: Christopher Braga <quic_cbraga@xxxxxxxxxxx>
>> ---
>>  drivers/gpu/drm/Makefile            |   1 +
>>  drivers/gpu/drm/drm_atomic.c        |  79 +++++++++++++
>>  drivers/gpu/drm/drm_atomic_helper.c |  12 ++
>>  drivers/gpu/drm/drm_atomic_uapi.c   |  48 ++++++++
>>  drivers/gpu/drm/drm_colorop.c       | 169 ++++++++++++++++++++++++++++
>>  drivers/gpu/drm/drm_mode_config.c   |   7 ++
>>  drivers/gpu/drm/drm_plane_helper.c  |   2 +-
>>  include/drm/drm_atomic.h            |  82 ++++++++++++++
>>  include/drm/drm_atomic_uapi.h       |   1 +
>>  include/drm/drm_colorop.h           | 157 ++++++++++++++++++++++++++
>>  include/drm/drm_mode_config.h       |  18 +++
>>  include/drm/drm_plane.h             |   2 +
>>  include/uapi/drm/drm.h              |   3 +
>>  include/uapi/drm/drm_mode.h         |   1 +
>>  14 files changed, 581 insertions(+), 1 deletion(-)
>>  create mode 100644 drivers/gpu/drm/drm_colorop.c
>>  create mode 100644 include/drm/drm_colorop.h
>>
>> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
>> index 1855863b4d7a..941de0269709 100644
>> --- a/drivers/gpu/drm/Makefile
>> +++ b/drivers/gpu/drm/Makefile
>> @@ -16,6 +16,7 @@ drm-y := \
>>  	drm_client.o \
>>  	drm_client_modeset.o \
>>  	drm_color_mgmt.o \
>> +	drm_colorop.o \
>>  	drm_connector.o \
>>  	drm_crtc.o \
>>  	drm_displayid.o \
>> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
>> index 11f3a130f6f4..d734e9d5bfed 100644
>> --- a/drivers/gpu/drm/drm_atomic.c
>> +++ b/drivers/gpu/drm/drm_atomic.c
>> @@ -42,6 +42,7 @@
>>  #include <drm/drm_mode.h>
>>  #include <drm/drm_print.h>
>>  #include <drm/drm_writeback.h>
>> +#include <drm/drm_colorop.h>
>>  
>>  #include "drm_crtc_internal.h"
>>  #include "drm_internal.h"
>> @@ -108,6 +109,7 @@ void drm_atomic_state_default_release(struct drm_atomic_state *state)
>>  	kfree(state->connectors);
>>  	kfree(state->crtcs);
>>  	kfree(state->planes);
>> +	kfree(state->colorops);
>>  	kfree(state->private_objs);
>>  }
>>  EXPORT_SYMBOL(drm_atomic_state_default_release);
>> @@ -139,6 +141,10 @@ drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state)
>>  				sizeof(*state->planes), GFP_KERNEL);
>>  	if (!state->planes)
>>  		goto fail;
>> +	state->colorops = kcalloc(dev->mode_config.num_colorop,
>> +				  sizeof(*state->colorops), GFP_KERNEL);
>> +	if (!state->colorops)
>> +		goto fail;
>>  
>>  	state->dev = dev;
>>  
>> @@ -244,6 +250,20 @@ void drm_atomic_state_default_clear(struct drm_atomic_state *state)
>>  		state->planes[i].new_state = NULL;
>>  	}
>>  
>> +	for (i = 0; i < config->num_colorop; i++) {
>> +		struct drm_colorop *colorop = state->colorops[i].ptr;
>> +
>> +		if (!colorop)
>> +			continue;
>> +
>> +		drm_colorop_atomic_destroy_state(colorop,
>> +						 state->colorops[i].state);
>> +		state->colorops[i].ptr = NULL;
>> +		state->colorops[i].state = NULL;
>> +		state->colorops[i].old_state = NULL;
>> +		state->colorops[i].new_state = NULL;
>> +	}
>> +
>>  	for (i = 0; i < state->num_private_objs; i++) {
>>  		struct drm_private_obj *obj = state->private_objs[i].ptr;
>>  
>> @@ -562,6 +582,65 @@ drm_atomic_get_plane_state(struct drm_atomic_state *state,
>>  }
>>  EXPORT_SYMBOL(drm_atomic_get_plane_state);
>>  
>> +
>> +/**
>> + * drm_atomic_get_colorop_state - get colorop state
>> + * @state: global atomic state object
>> + * @colorop: colorop to get state object for
>> + *
>> + * This function returns the colorop state for the given colorop, allocating it
>> + * if needed. It will also grab the relevant plane lock to make sure that the
>> + * state is consistent.
>> + *
>> + * Returns:
>> + *
>> + * Either the allocated state or the error code encoded into the pointer. When
>> + * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
>> + * entire atomic sequence must be restarted. All other errors are fatal.
>> + */
>> +struct drm_colorop_state *
>> +drm_atomic_get_colorop_state(struct drm_atomic_state *state,
>> +			     struct drm_colorop *colorop)
>> +{
>> +	int ret, index = drm_colorop_index(colorop);
>> +	struct drm_colorop_state *colorop_state;
>> +	struct drm_plane_state *plane_state;
>> +
>> +	WARN_ON(!state->acquire_ctx);
>> +
>> +	colorop_state = drm_atomic_get_existing_colorop_state(state, colorop);
>> +	if (colorop_state)
>> +		return colorop_state;
>> +
>> +	/* TODO where is the unlock? */
> 
> I understand that this is tracked by acquire-ctx and unlocked by
> `drm_modeset_drop_locks()` (?)
> 

I think you're right. I've left it here as a reminder to review the locking.

Harry

>> +	ret = drm_modeset_lock(&colorop->plane->mutex, state->acquire_ctx);
>> +	if (ret)
>> +		return ERR_PTR(ret);
>> +
>> +	colorop_state = drm_atomic_helper_colorop_duplicate_state(colorop);
>> +	if (!colorop_state)
>> +		return ERR_PTR(-ENOMEM);
>> +
>> +	state->colorops[index].state = colorop_state;
>> +	state->colorops[index].ptr = colorop;
>> +	state->colorops[index].old_state = colorop->state;
>> +	state->colorops[index].new_state = colorop_state;
>> +	colorop_state->state = state;
>> +
>> +	drm_dbg_atomic(colorop->dev, "Added [COLOROP:%d] %p state to %p\n",
>> +		       colorop->base.id, colorop_state, state);
>> +
>> +	/* TODO is this necessary? */
>> +
>> +	plane_state = drm_atomic_get_plane_state(state,
>> +						 colorop->plane);
>> +	if (IS_ERR(plane_state))
>> +		return ERR_CAST(plane_state);
>> +
>> +	return colorop_state;
>> +}
>> +EXPORT_SYMBOL(drm_atomic_get_colorop_state);
>> +
>>  static bool
>>  plane_switching_crtc(const struct drm_plane_state *old_plane_state,
>>  		     const struct drm_plane_state *new_plane_state)
>> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
>> index d579fd8f7cb8..0472f6182c0a 100644
>> --- a/drivers/gpu/drm/drm_atomic_helper.c
>> +++ b/drivers/gpu/drm/drm_atomic_helper.c
>> @@ -2921,6 +2921,8 @@ int drm_atomic_helper_swap_state(struct drm_atomic_state *state,
>>  	struct drm_crtc_state *old_crtc_state, *new_crtc_state;
>>  	struct drm_plane *plane;
>>  	struct drm_plane_state *old_plane_state, *new_plane_state;
>> +	struct drm_colorop *colorop;
>> +	struct drm_colorop_state *old_colorop_state, *new_colorop_state;
>>  	struct drm_crtc_commit *commit;
>>  	struct drm_private_obj *obj;
>>  	struct drm_private_state *old_obj_state, *new_obj_state;
>> @@ -2998,6 +3000,16 @@ int drm_atomic_helper_swap_state(struct drm_atomic_state *state,
>>  		}
>>  	}
>>  
>> +	for_each_oldnew_colorop_in_state(state, colorop, old_colorop_state, new_colorop_state, i) {
>> +		WARN_ON(colorop->state != old_colorop_state);
>> +
>> +		old_colorop_state->state = state;
>> +		new_colorop_state->state = NULL;
>> +
>> +		state->colorops[i].state = old_colorop_state;
>> +		colorop->state = new_colorop_state;
>> +	}
>> +
>>  	for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
>>  		WARN_ON(plane->state != old_plane_state);
>>  
>> diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
>> index d867e7f9f2cd..b1aa752c1848 100644
>> --- a/drivers/gpu/drm/drm_atomic_uapi.c
>> +++ b/drivers/gpu/drm/drm_atomic_uapi.c
>> @@ -34,6 +34,7 @@
>>  #include <drm/drm_drv.h>
>>  #include <drm/drm_writeback.h>
>>  #include <drm/drm_vblank.h>
>> +#include <drm/drm_colorop.h>
>>  
>>  #include <linux/dma-fence.h>
>>  #include <linux/uaccess.h>
>> @@ -642,6 +643,26 @@ drm_atomic_plane_get_property(struct drm_plane *plane,
>>  	return 0;
>>  }
>>  
>> +
>> +static int drm_atomic_colorop_set_property(struct drm_colorop *colorop,
>> +		struct drm_colorop_state *state, struct drm_file *file_priv,
>> +		struct drm_property *property, uint64_t val)
>> +{
>> +	drm_dbg_atomic(colorop->dev,
>> +			"[COLOROP:%d] unknown property [PROP:%d:%s]]\n",
>> +			colorop->base.id,
>> +			property->base.id, property->name);
>> +	return -EINVAL;
>> +}
>> +
>> +static int
>> +drm_atomic_colorop_get_property(struct drm_colorop *colorop,
>> +		const struct drm_colorop_state *state,
>> +		struct drm_property *property, uint64_t *val)
>> +{
>> +	return -EINVAL;
>> +}
>> +
>>  static int drm_atomic_set_writeback_fb_for_connector(
>>  		struct drm_connector_state *conn_state,
>>  		struct drm_framebuffer *fb)
>> @@ -893,6 +914,16 @@ int drm_atomic_get_property(struct drm_mode_object *obj,
>>  				plane->state, property, val);
>>  		break;
>>  	}
>> +	case DRM_MODE_OBJECT_COLOROP: {
>> +		struct drm_colorop *colorop = obj_to_colorop(obj);
>> +
>> +		if (colorop->plane)
>> +			WARN_ON(!drm_modeset_is_locked(&colorop->plane->mutex));
>> +
>> +		ret = drm_atomic_colorop_get_property(colorop,
>> +				colorop->state, property, val);
>> +		break;
>> +	}
>>  	default:
>>  		ret = -EINVAL;
>>  		break;
>> @@ -1027,6 +1058,23 @@ int drm_atomic_set_property(struct drm_atomic_state *state,
>>  		ret = drm_atomic_plane_set_property(plane,
>>  				plane_state, file_priv,
>>  				prop, prop_value);
>> +
>> +		break;
>> +	}
>> +	case DRM_MODE_OBJECT_COLOROP: {
>> +		struct drm_colorop *colorop = obj_to_colorop(obj);
>> +		struct drm_colorop_state *colorop_state;
>> +
>> +		colorop_state = drm_atomic_get_colorop_state(state, colorop);
>> +		if (IS_ERR(colorop_state)) {
>> +			ret = PTR_ERR(colorop_state);
>> +			break;
>> +		}
>> +
>> +		ret = drm_atomic_colorop_set_property(colorop,
>> +				colorop_state, file_priv,
>> +				prop, prop_value);
>> +
>>  		break;
>>  	}
>>  	default:
>> diff --git a/drivers/gpu/drm/drm_colorop.c b/drivers/gpu/drm/drm_colorop.c
>> new file mode 100644
>> index 000000000000..78d6a0067f5b
>> --- /dev/null
>> +++ b/drivers/gpu/drm/drm_colorop.c
>> @@ -0,0 +1,169 @@
>> +/*
>> + * Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.
>> + *
>> + * Permission is hereby granted, free of charge, to any person obtaining a
>> + * copy of this software and associated documentation files (the "Software"),
>> + * to deal in the Software without restriction, including without limitation
>> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
>> + * and/or sell copies of the Software, and to permit persons to whom the
>> + * Software is furnished to do so, subject to the following conditions:
>> + *
>> + * The above copyright notice and this permission notice shall be included in
>> + * all copies or substantial portions of the Software.
>> + *
>> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
>> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
>> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
>> + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
>> + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
>> + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
>> + * OTHER DEALINGS IN THE SOFTWARE.
>> + *
>> + * Authors: AMD
>> + *
>> + */
>> +
>> +#include <drm/drm_colorop.h>
>> +#include <drm/drm_print.h>
>> +#include <drm/drm_drv.h>
>> +#include <drm/drm_plane.h>
>> +
>> +#include "drm_crtc_internal.h"
>> +
>> +/* TODO big colorop doc, including properties, etc. */
>> +
>> +/* Init Helpers */
>> +
>> +int drm_colorop_init(struct drm_device *dev, struct drm_colorop *colorop,
>> +		     struct drm_plane *plane)
>> +{
>> +	struct drm_mode_config *config = &dev->mode_config;
>> +	int ret = 0;
>> +
>> +	ret = drm_mode_object_add(dev, &colorop->base, DRM_MODE_OBJECT_COLOROP);
>> +	if (ret)
>> +		return ret;
>> +
>> +	colorop->base.properties = &colorop->properties;
>> +	colorop->dev = dev;
>> +	colorop->plane = plane;
>> +
>> +	list_add_tail(&colorop->head, &config->colorop_list);
>> +	colorop->index = config->num_colorop++;
>> +
>> +	/* add properties */
>> +	return ret;
>> +}
>> +EXPORT_SYMBOL(drm_colorop_init);
>> +
>> +void __drm_atomic_helper_colorop_duplicate_state(struct drm_colorop *colorop,
>> +						 struct drm_colorop_state *state)
>> +{
>> +	memcpy(state, colorop->state, sizeof(*state));
>> +}
>> +
>> +struct drm_colorop_state *
>> +drm_atomic_helper_colorop_duplicate_state(struct drm_colorop *colorop)
>> +{
>> +	struct drm_colorop_state *state;
>> +
>> +	if (WARN_ON(!colorop->state))
>> +		return NULL;
>> +
>> +	state = kmalloc(sizeof(*state), GFP_KERNEL);
>> +	if (state)
>> +		__drm_atomic_helper_colorop_duplicate_state(colorop, state);
>> +
>> +	return state;
>> +}
>> +
>> +
>> +void drm_colorop_atomic_destroy_state(struct drm_colorop *colorop,
>> +				      struct drm_colorop_state *state)
>> +{
>> +	kfree(state);
>> +}
>> +
>> +/**
>> + * __drm_colorop_destroy_state - release colorop state
>> + * @state: colorop state object to release
>> + *
>> + * Releases all resources stored in the colorop state without actually freeing
>> + * the memory of the colorop state. This is useful for drivers that subclass the
>> + * colorop state.
>> + */
>> +void __drm_colorop_destroy_state(struct drm_colorop_state *state)
>> +{
>> +	/* TODO might need this later */
>> +}
>> +
>> +/**
>> + * drm_colorop_destroy_state - default state destroy hook
>> + * @colorop: drm colorop
>> + * @state: colorop state object to release
>> + *
>> + * Default colorop state destroy hook for drivers which don't have their own
>> + * subclassed colorop state structure.
>> + */
>> +void drm_colorop_destroy_state(struct drm_colorop *colorop,
>> +					   struct drm_colorop_state *state)
>> +{
>> +	kfree(state);
>> +}
>> +EXPORT_SYMBOL(drm_colorop_destroy_state);
>> +
>> +/**
>> + * __drm_colorop_state_reset - resets colorop state to default values
>> + * @colorop_state: atomic colorop state, must not be NULL
>> + * @colorop: colorop object, must not be NULL
>> + *
>> + * Initializes the newly allocated @colorop_state with default
>> + * values. This is useful for drivers that subclass the CRTC state.
>> + */
>> +void __drm_colorop_state_reset(struct drm_colorop_state *colorop_state,
>> +					   struct drm_colorop *colorop)
>> +{
>> +	colorop_state->colorop = colorop;
>> +}
>> +EXPORT_SYMBOL(__drm_colorop_state_reset);
>> +
>> +/**
>> + * __drm_colorop_reset - reset state on colorop
>> + * @colorop: drm colorop
>> + * @colorop_state: colorop state to assign
>> + *
>> + * Initializes the newly allocated @colorop_state and assigns it to
>> + * the &drm_crtc->state pointer of @colorop, usually required when
>> + * initializing the drivers or when called from the &drm_colorop_funcs.reset
>> + * hook.
>> + *
>> + * This is useful for drivers that subclass the colorop state.
>> + */
>> +void __drm_colorop_reset(struct drm_colorop *colorop,
>> +				     struct drm_colorop_state *colorop_state)
>> +{
>> +	if (colorop_state)
>> +		__drm_colorop_state_reset(colorop_state, colorop);
>> +
>> +	colorop->state = colorop_state;
>> +}
>> +
>> +/**
>> + * drm_colorop_reset - reset colorop atomic state
>> + * @colorop: drm colorop
>> + *
>> + * Resets the atomic state for @colorop by freeing the state pointer (which might
>> + * be NULL, e.g. at driver load time) and allocating a new empty state object.
>> + */
>> +void drm_colorop_reset(struct drm_colorop *colorop)
>> +{
>> +	if (colorop->state)
>> +		__drm_colorop_destroy_state(colorop->state);
>> +
>> +	kfree(colorop->state);
>> +	colorop->state = kzalloc(sizeof(*colorop->state), GFP_KERNEL);
>> +
>> +	if (colorop->state)
>> +		__drm_colorop_reset(colorop, colorop->state);
>> +}
>> +EXPORT_SYMBOL(drm_colorop_reset);
>> diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
>> index 87eb591fe9b5..5bdcf71e1ae0 100644
>> --- a/drivers/gpu/drm/drm_mode_config.c
>> +++ b/drivers/gpu/drm/drm_mode_config.c
>> @@ -29,6 +29,7 @@
>>  #include <drm/drm_managed.h>
>>  #include <drm/drm_mode_config.h>
>>  #include <drm/drm_print.h>
>> +#include <drm/drm_colorop.h>
>>  #include <linux/dma-resv.h>
>>  
>>  #include "drm_crtc_internal.h"
>> @@ -184,11 +185,15 @@ int drm_mode_getresources(struct drm_device *dev, void *data,
>>  void drm_mode_config_reset(struct drm_device *dev)
>>  {
>>  	struct drm_crtc *crtc;
>> +	struct drm_colorop *colorop;
>>  	struct drm_plane *plane;
>>  	struct drm_encoder *encoder;
>>  	struct drm_connector *connector;
>>  	struct drm_connector_list_iter conn_iter;
>>  
>> +	drm_for_each_colorop(colorop, dev)
>> +		drm_colorop_reset(colorop);
>> +
>>  	drm_for_each_plane(plane, dev)
>>  		if (plane->funcs->reset)
>>  			plane->funcs->reset(plane);
>> @@ -415,6 +420,7 @@ int drmm_mode_config_init(struct drm_device *dev)
>>  	INIT_LIST_HEAD(&dev->mode_config.property_list);
>>  	INIT_LIST_HEAD(&dev->mode_config.property_blob_list);
>>  	INIT_LIST_HEAD(&dev->mode_config.plane_list);
>> +	INIT_LIST_HEAD(&dev->mode_config.colorop_list);
>>  	INIT_LIST_HEAD(&dev->mode_config.privobj_list);
>>  	idr_init_base(&dev->mode_config.object_idr, 1);
>>  	idr_init_base(&dev->mode_config.tile_idr, 1);
>> @@ -436,6 +442,7 @@ int drmm_mode_config_init(struct drm_device *dev)
>>  	dev->mode_config.num_crtc = 0;
>>  	dev->mode_config.num_encoder = 0;
>>  	dev->mode_config.num_total_plane = 0;
>> +	dev->mode_config.num_colorop = 0;
>>  
>>  	if (IS_ENABLED(CONFIG_LOCKDEP)) {
>>  		struct drm_modeset_acquire_ctx modeset_ctx;
>> diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c
>> index c91e454eba09..69faa0eeb27f 100644
>> --- a/drivers/gpu/drm/drm_plane_helper.c
>> +++ b/drivers/gpu/drm/drm_plane_helper.c
>> @@ -318,4 +318,4 @@ int drm_plane_helper_atomic_check(struct drm_plane *plane, struct drm_atomic_sta
>>  						   DRM_PLANE_NO_SCALING,
>>  						   false, false);
>>  }
>> -EXPORT_SYMBOL(drm_plane_helper_atomic_check);
>> +EXPORT_SYMBOL(drm_plane_helper_atomic_check);
>> \ No newline at end of file
>> diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
>> index 92586ab55ef5..dca8fc26ad71 100644
>> --- a/include/drm/drm_atomic.h
>> +++ b/include/drm/drm_atomic.h
>> @@ -30,6 +30,7 @@
>>  
>>  #include <drm/drm_crtc.h>
>>  #include <drm/drm_util.h>
>> +#include <drm/drm_colorop.h>
>>  
>>  /**
>>   * struct drm_crtc_commit - track modeset commits on a CRTC
>> @@ -157,6 +158,11 @@ struct drm_crtc_commit {
>>  	bool abort_completion;
>>  };
>>  
>> +struct __drm_colorops_state {
>> +	struct drm_colorop *ptr;
>> +	struct drm_colorop_state *state, *old_state, *new_state;
>> +};
>> +
>>  struct __drm_planes_state {
>>  	struct drm_plane *ptr;
>>  	struct drm_plane_state *state, *old_state, *new_state;
>> @@ -398,6 +404,7 @@ struct drm_atomic_state {
>>  	 * states.
>>  	 */
>>  	bool duplicated : 1;
>> +	struct __drm_colorops_state *colorops;
>>  	struct __drm_planes_state *planes;
>>  	struct __drm_crtcs_state *crtcs;
>>  	int num_connector;
>> @@ -501,6 +508,9 @@ drm_atomic_get_crtc_state(struct drm_atomic_state *state,
>>  struct drm_plane_state * __must_check
>>  drm_atomic_get_plane_state(struct drm_atomic_state *state,
>>  			   struct drm_plane *plane);
>> +struct drm_colorop_state *
>> +drm_atomic_get_colorop_state(struct drm_atomic_state *state,
>> +			     struct drm_colorop *colorop);
>>  struct drm_connector_state * __must_check
>>  drm_atomic_get_connector_state(struct drm_atomic_state *state,
>>  			       struct drm_connector *connector);
>> @@ -623,6 +633,55 @@ drm_atomic_get_new_plane_state(const struct drm_atomic_state *state,
>>  	return state->planes[drm_plane_index(plane)].new_state;
>>  }
>>  
>> +
>> +/**
>> + * drm_atomic_get_existing_colorop_state - get colorop state, if it exists
>> + * @state: global atomic state object
>> + * @colorop: colorop to grab
>> + *
>> + * This function returns the colorop state for the given colorop, or NULL
>> + * if the colorop is not part of the global atomic state.
>> + *
>> + * This function is deprecated, @drm_atomic_get_old_colorop_state or
>> + * @drm_atomic_get_new_colorop_state should be used instead.
>> + */
>> +static inline struct drm_colorop_state *
>> +drm_atomic_get_existing_colorop_state(struct drm_atomic_state *state,
>> +				    struct drm_colorop *colorop)
>> +{
>> +	return state->colorops[drm_colorop_index(colorop)].state;
>> +}
>> +
>> +/**
>> + * drm_atomic_get_old_colorop_state - get colorop state, if it exists
>> + * @state: global atomic state object
>> + * @colorop: colorop to grab
>> + *
>> + * This function returns the old colorop state for the given colorop, or
>> + * NULL if the colorop is not part of the global atomic state.
>> + */
>> +static inline struct drm_colorop_state *
>> +drm_atomic_get_old_colorop_state(struct drm_atomic_state *state,
>> +			       struct drm_colorop *colorop)
>> +{
>> +	return state->colorops[drm_colorop_index(colorop)].old_state;
>> +}
>> +
>> +/**
>> + * drm_atomic_get_new_colorop_state - get colorop state, if it exists
>> + * @state: global atomic state object
>> + * @colorop: colorop to grab
>> + *
>> + * This function returns the new colorop state for the given colorop, or
>> + * NULL if the colorop is not part of the global atomic state.
>> + */
>> +static inline struct drm_colorop_state *
>> +drm_atomic_get_new_colorop_state(struct drm_atomic_state *state,
>> +			       struct drm_colorop *colorop)
>> +{
>> +	return state->colorops[drm_colorop_index(colorop)].new_state;
>> +}
>> +
>>  /**
>>   * drm_atomic_get_existing_connector_state - get connector state, if it exists
>>   * @state: global atomic state object
>> @@ -870,6 +929,29 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
>>  			     (new_crtc_state) = (__state)->crtcs[__i].new_state, \
>>  			     (void)(new_crtc_state) /* Only to avoid unused-but-set-variable warning */, 1))
>>  
>> +/**
>> + * for_each_oldnew_colorop_in_state - iterate over all colorops in an atomic update
>> + * @__state: &struct drm_atomic_state pointer
>> + * @colorop: &struct drm_colorop iteration cursor
>> + * @old_colorop_state: &struct drm_colorop_state iteration cursor for the old state
>> + * @new_colorop_state: &struct drm_colorop_state iteration cursor for the new state
>> + * @__i: int iteration cursor, for macro-internal use
>> + *
>> + * This iterates over all colorops in an atomic update, tracking both old and
>> + * new state. This is useful in places where the state delta needs to be
>> + * considered, for example in atomic check functions.
>> + */
>> +#define for_each_oldnew_colorop_in_state(__state, colorop, old_colorop_state, new_colorop_state, __i) \
>> +	for ((__i) = 0;							\
>> +	     (__i) < (__state)->dev->mode_config.num_colorop;	\
>> +	     (__i)++)							\
>> +		for_each_if ((__state)->colorops[__i].ptr &&		\
>> +			     ((colorop) = (__state)->colorops[__i].ptr,	\
>> +			      (void)(colorop) /* Only to avoid unused-but-set-variable warning */, \
>> +			      (old_colorop_state) = (__state)->colorops[__i].old_state,\
>> +			      (new_colorop_state) = (__state)->colorops[__i].new_state, 1))
>> +
>> +
>>  /**
>>   * for_each_oldnew_plane_in_state - iterate over all planes in an atomic update
>>   * @__state: &struct drm_atomic_state pointer
>> diff --git a/include/drm/drm_atomic_uapi.h b/include/drm/drm_atomic_uapi.h
>> index 4c6d39d7bdb2..70a115d523cd 100644
>> --- a/include/drm/drm_atomic_uapi.h
>> +++ b/include/drm/drm_atomic_uapi.h
>> @@ -37,6 +37,7 @@ struct drm_crtc;
>>  struct drm_connector_state;
>>  struct dma_fence;
>>  struct drm_framebuffer;
>> +struct drm_colorop;
>>  
>>  int __must_check
>>  drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,
>> diff --git a/include/drm/drm_colorop.h b/include/drm/drm_colorop.h
>> new file mode 100644
>> index 000000000000..3dd169b0317d
>> --- /dev/null
>> +++ b/include/drm/drm_colorop.h
>> @@ -0,0 +1,157 @@
>> +/*
>> + * Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.
>> + *
>> + * Permission is hereby granted, free of charge, to any person obtaining a
>> + * copy of this software and associated documentation files (the "Software"),
>> + * to deal in the Software without restriction, including without limitation
>> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
>> + * and/or sell copies of the Software, and to permit persons to whom the
>> + * Software is furnished to do so, subject to the following conditions:
>> + *
>> + * The above copyright notice and this permission notice shall be included in
>> + * all copies or substantial portions of the Software.
>> + *
>> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
>> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
>> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
>> + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
>> + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
>> + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
>> + * OTHER DEALINGS IN THE SOFTWARE.
>> + *
>> + * Authors: AMD
>> + *
>> + */
>> +
>> +#ifndef __DRM_COLOROP_H__
>> +#define __DRM_COLOROP_H__
>> +
>> +#include <drm/drm_mode_object.h>
>> +#include <drm/drm_mode.h>
>> +#include <drm/drm_property.h>
>> +
>> +/**
>> + * struct drm_colorop_state - mutable colorop state
>> + */
>> +struct drm_colorop_state {
>> +	/** @colorop: backpointer to the colorop */
>> +	struct drm_colorop *colorop;
>> +
>> +	/* colorop properties */
>> +
>> +	/** @state: backpointer to global drm_atomic_state */
>> +	struct drm_atomic_state *state;
>> +};
>> +
>> +/**
>> + * struct drm_colorop - DRM color operation control structure
>> + *
>> + * A colorop represents one color operation. They can be chained via
>> + * the 'next' pointer to build a color pipeline.
>> + */
>> +struct drm_colorop {
>> +	/** @dev: parent DRM device */
>> +	struct drm_device *dev;
>> +
>> +	/**
>> +	 * @head:
>> +	 *
>> +	 * List of all colorops on @dev, linked from &drm_mode_config.colorop_list.
>> +	 * Invariant over the lifetime of @dev and therefore does not need
>> +	 * locking.
>> +	 */
>> +	struct list_head head;
>> +
>> +	/**
>> +	 * @index: Position inside the mode_config.list, can be used as an array
>> +	 * index. It is invariant over the lifetime of the plane.
>> +	 */
>> +	unsigned index;
>> +
>> +	/* TODO do we need a separate mutex or will we tag along with the plane mutex? */
>> +
>> +	/** @base base mode object*/
>> +	struct drm_mode_object base;
>> +
>> +	/**
>> +	 * @plane:
>> +	 *
>> +	 * The plane on which the colorop sits. A drm_colorop is always unique
>> +	 * to a plane.
>> +	 */
>> +	struct drm_plane *plane;
>> +
>> +	/**
>> +	 * @state:
>> +	 *
>> +	 * Current atomic state for this colorop.
>> +	 *
>> +	 * This is protected by @mutex. Note that nonblocking atomic commits
>> +	 * access the current colorop state without taking locks. Either by
>> +	 * going through the &struct drm_atomic_state pointers, see
>> +	 * for_each_oldnew_plane_in_state(), for_each_old_plane_in_state() and
>> +	 * for_each_new_plane_in_state(). Or through careful ordering of atomic
>> +	 * commit operations as implemented in the atomic helpers, see
>> +	 * &struct drm_crtc_commit.
>> +	 *
>> +	 * TODO keep, remove, or rewrite above plane references?
>> +	 */
>> +	struct drm_colorop_state *state;
>> +
>> +	/* colorop properties */
>> +
>> +	/** @properties: property tracking for this plane */
>> +	struct drm_object_properties properties;
>> +
>> +};
>> +
>> +#define obj_to_colorop(x) container_of(x, struct drm_colorop, base)
>> +
>> +/**
>> + * drm_crtc_find - look up a Colorop object from its ID
>> + * @dev: DRM device
>> + * @file_priv: drm file to check for lease against.
>> + * @id: &drm_mode_object ID
>> + *
>> + * This can be used to look up a Colorop from its userspace ID. Only used by
>> + * drivers for legacy IOCTLs and interface, nowadays extensions to the KMS
>> + * userspace interface should be done using &drm_property.
>> + */
>> +static inline struct drm_colorop *drm_colorop_find(struct drm_device *dev,
>> +		struct drm_file *file_priv,
>> +		uint32_t id)
>> +{
>> +	struct drm_mode_object *mo;
>> +	mo = drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_COLOROP);
>> +	return mo ? obj_to_colorop(mo) : NULL;
>> +}
>> +
>> +int drm_colorop_init(struct drm_device *dev, struct drm_colorop *colorop,
>> +		     struct drm_plane *plane);
>> +
>> +struct drm_colorop_state *
>> +drm_atomic_helper_colorop_duplicate_state(struct drm_colorop *colorop);
>> +
>> +void drm_colorop_atomic_destroy_state(struct drm_colorop *colorop,
>> +				      struct drm_colorop_state *state);
>> +
>> +void drm_colorop_reset(struct drm_colorop *colorop);
>> +
>> +/**
>> + * drm_colorop_index - find the index of a registered colorop
>> + * @colorop: colorop to find index for
>> + *
>> + * Given a registered colorop, return the index of that colorop within a DRM
>> + * device's list of colorops.
>> + */
>> +static inline unsigned int drm_colorop_index(const struct drm_colorop *colorop)
>> +{
>> +	return colorop->index;
>> +}
>> +
>> +
>> +#define drm_for_each_colorop(colorop, dev) \
>> +	list_for_each_entry(colorop, &(dev)->mode_config.colorop_list, head)
>> +
>> +
>> +#endif /* __DRM_COLOROP_H__ */
>> diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
>> index e5b053001d22..f56d21d93cf0 100644
>> --- a/include/drm/drm_mode_config.h
>> +++ b/include/drm/drm_mode_config.h
>> @@ -505,6 +505,24 @@ struct drm_mode_config {
>>  	 */
>>  	struct list_head plane_list;
>>  
>> +	/**
>> +	 * @num_colorop:
>> +	 *
>> +	 * Number of colorop objects on this device.
>> +	 * This is invariant over the lifetime of a device and hence doesn't
>> +	 * need any locks.
>> +	 */
>> +	int num_colorop;
>> +
>> +	/**
>> +	 * @colorops_list:
>> +	 *
>> +	 * List of colorop objects linked with &drm_colorop.head. This is
>> +	 * invariant over the lifetime of a device and hence doesn't need any
>> +	 * locks.
>> +	 */
>> +	struct list_head colorop_list;
>> +
>>  	/**
>>  	 * @num_crtc:
>>  	 *
>> diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
>> index 51291983ea44..cfb8f46b94ab 100644
>> --- a/include/drm/drm_plane.h
>> +++ b/include/drm/drm_plane.h
>> @@ -227,6 +227,8 @@ struct drm_plane_state {
>>  	 */
>>  	enum drm_scaling_filter scaling_filter;
>>  
>> +	struct drm_colorop *color_pipeline;
>> +
>>  	/**
>>  	 * @commit: Tracks the pending commit to prevent use-after-free conditions,
>>  	 * and for async plane updates.
>> diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
>> index 642808520d92..dec498a44eae 100644
>> --- a/include/uapi/drm/drm.h
>> +++ b/include/uapi/drm/drm.h
>> @@ -1116,6 +1116,9 @@ extern "C" {
>>   */
>>  #define DRM_IOCTL_MODE_GETFB2		DRM_IOWR(0xCE, struct drm_mode_fb_cmd2)
>>  
>> +#define DRM_IOCTL_MODE_GETCOLOROPRESOURCES DRM_IOWR(0xD0, struct drm_mode_get_colorop_res)
>> +#define DRM_IOCTL_MODE_GETCOLOROP          DRM_IOWR(0xD1, struct drm_mode_get_colorop)
>> +
>>  /*
>>   * Device specific ioctls should only be in their respective headers
>>   * The device specific ioctl range is from 0x40 to 0x9f.
>> diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
>> index 46becedf5b2f..6dcf628def56 100644
>> --- a/include/uapi/drm/drm_mode.h
>> +++ b/include/uapi/drm/drm_mode.h
>> @@ -626,6 +626,7 @@ struct drm_mode_connector_set_property {
>>  #define DRM_MODE_OBJECT_FB 0xfbfbfbfb
>>  #define DRM_MODE_OBJECT_BLOB 0xbbbbbbbb
>>  #define DRM_MODE_OBJECT_PLANE 0xeeeeeeee
>> +#define DRM_MODE_OBJECT_COLOROP 0xfafafafa
>>  #define DRM_MODE_OBJECT_ANY 0
>>  
>>  struct drm_mode_obj_get_properties {
>> -- 
>> 2.42.0
>>




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