drivers/gpu/drm/msm/sde/sde_rm.h

/*
 * Copyright (c) 2016, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#ifndef __SDE_RM_H__
#define __SDE_RM_H__

#include <linux/list.h>

#include "msm_kms.h"
#include "sde_hw_top.h"

/**
 * enum sde_rm_topology_name - HW resource use case in use by connector
 * @SDE_RM_TOPOLOGY_UNKNOWN: No topology in use currently
 * @SDE_RM_TOPOLOGY_SINGLEPIPE: 1 LM, 1 PP, 1 INTF/WB
 * @SDE_RM_TOPOLOGY_DUALPIPE: 2 LM, 2 PP, 2 INTF/WB
 * @SDE_RM_TOPOLOGY_PPSPLIT: 1 LM, 2 PPs, 2 INTF/WB
 * @SDE_RM_TOPOLOGY_DUALPIPEMERGE: 2 LM, 2 PP, 3DMux, 1 INTF/WB
 */
enum sde_rm_topology_name {
	SDE_RM_TOPOLOGY_UNKNOWN = 0,
	SDE_RM_TOPOLOGY_SINGLEPIPE,
	SDE_RM_TOPOLOGY_DUALPIPE,
	SDE_RM_TOPOLOGY_PPSPLIT,
	SDE_RM_TOPOLOGY_DUALPIPEMERGE,
};

/**
 * enum sde_rm_topology_control - HW resource use case in use by connector
 * @SDE_RM_TOPCTL_RESERVE_LOCK: If set, in AtomicTest phase, after a successful
 *                              test, reserve the resources for this display.
 *                              Normal behavior would not impact the reservation
 *                              list during the AtomicTest phase.
 * @SDE_RM_TOPCTL_RESERVE_CLEAR: If set, in AtomicTest phase, before testing,
 *                               release any reservation held by this display.
 *                               Normal behavior would not impact the
 *                               reservation list during the AtomicTest phase.
 * @SDE_RM_TOPCTL_DSPP: Require layer mixers with DSPP capabilities
 * @SDE_RM_TOPCTL_FORCE_TILING: Require kernel to split across multiple layer
 *                              mixers, despite width fitting within capability
 *                              of a single layer mixer.
 * @SDE_RM_TOPCTL_PPSPLIT: Require kernel to use pingpong split pipe
 *                         configuration instead of dual pipe.
 */
enum sde_rm_topology_control {
	SDE_RM_TOPCTL_RESERVE_LOCK,
	SDE_RM_TOPCTL_RESERVE_CLEAR,
	SDE_RM_TOPCTL_DSPP,
	SDE_RM_TOPCTL_FORCE_TILING,
	SDE_RM_TOPCTL_PPSPLIT,
};

/**
 * struct sde_rm - SDE dynamic hardware resource manager
 * @dev: device handle for event logging purposes
 * @rsvps: list of hardware reservations by each crtc->encoder->connector
 * @hw_blks: array of lists of hardware resources present in the system, one
 *	list per type of hardware block
 * @hw_mdp: hardware object for mdp_top
 * @lm_max_width: cached layer mixer maximum width
 * @rsvp_next_seq: sequence number for next reservation for debugging purposes
 */
struct sde_rm {
	struct drm_device *dev;
	struct list_head rsvps;
	struct list_head hw_blks[SDE_HW_BLK_MAX];
	struct sde_hw_mdp *hw_mdp;
	uint32_t lm_max_width;
	uint32_t rsvp_next_seq;
};

/**
 *  struct sde_rm_hw_blk - resource manager internal structure
 *	forward declaration for single iterator definition without void pointer
 */
struct sde_rm_hw_blk;

/**
 * struct sde_rm_hw_iter - iterator for use with sde_rm
 * @hw: sde_hw object requested, or NULL on failure
 * @blk: sde_rm internal block representation. Clients ignore. Used as iterator.
 * @enc_id: DRM ID of Encoder client wishes to search for, or 0 for Any Encoder
 * @type: Hardware Block Type client wishes to search for.
 */
struct sde_rm_hw_iter {
	void *hw;
	struct sde_rm_hw_blk *blk;
	uint32_t enc_id;
	enum sde_hw_blk_type type;
};

/**
 * sde_rm_init - Read hardware catalog and create reservation tracking objects
 *	for all HW blocks.
 * @rm: SDE Resource Manager handle
 * @cat: Pointer to hardware catalog
 * @mmio: mapped register io address of MDP
 * @dev: device handle for event logging purposes
 * @Return: 0 on Success otherwise -ERROR
 */
int sde_rm_init(struct sde_rm *rm,
		struct sde_mdss_cfg *cat,
		void *mmio,
		struct drm_device *dev);

/**
 * sde_rm_destroy - Free all memory allocated by sde_rm_init
 * @rm: SDE Resource Manager handle
 * @Return: 0 on Success otherwise -ERROR
 */
int sde_rm_destroy(struct sde_rm *rm);

/**
 * sde_rm_reserve - Given a CRTC->Encoder->Connector display chain, analyze
 *	the use connections and user requirements, specified through related
 *	topology control properties, and reserve hardware blocks to that
 *	display chain.
 *	HW blocks can then be accessed through sde_rm_get_* functions.
 *	HW Reservations should be released via sde_rm_release_hw.
 * @rm: SDE Resource Manager handle
 * @drm_enc: DRM Encoder handle
 * @crtc_state: Proposed Atomic DRM CRTC State handle
 * @conn_state: Proposed Atomic DRM Connector State handle
 * @test_only: Atomic-Test phase, discard results (unless property overrides)
 * @Return: 0 on Success otherwise -ERROR
 */
int sde_rm_reserve(struct sde_rm *rm,
		struct drm_encoder *drm_enc,
		struct drm_crtc_state *crtc_state,
		struct drm_connector_state *conn_state,
		bool test_only);

/**
 * sde_rm_reserve - Given the encoder for the display chain, release any
 *	HW blocks previously reserved for that use case.
 * @rm: SDE Resource Manager handle
 * @enc: DRM Encoder handle
 * @Return: 0 on Success otherwise -ERROR
 */
void sde_rm_release(struct sde_rm *rm, struct drm_encoder *enc);

/**
 * sde_rm_get_mdp - Retrieve HW block for MDP TOP.
 *	This is never reserved, and is usable by any display.
 * @rm: SDE Resource Manager handle
 * @Return: Pointer to hw block or NULL
 */
struct sde_hw_mdp *sde_rm_get_mdp(struct sde_rm *rm);

/**
 * sde_rm_init_hw_iter - setup given iterator for new iteration over hw list
 *	using sde_rm_get_hw
 * @iter: iter object to initialize
 * @enc_id: DRM ID of Encoder client wishes to search for, or 0 for Any Encoder
 * @type: Hardware Block Type client wishes to search for.
 */
void sde_rm_init_hw_iter(
		struct sde_rm_hw_iter *iter,
		uint32_t enc_id,
		enum sde_hw_blk_type type);
/**
 * sde_rm_get_hw - retrieve reserved hw object given encoder and hw type
 *	Meant to do a single pass through the hardware list to iteratively
 *	retrieve hardware blocks of a given type for a given encoder.
 *	Initialize an iterator object.
 *	Set hw block type of interest. Set encoder id of interest, 0 for any.
 *	Function returns first hw of type for that encoder.
 *	Subsequent calls will return the next reserved hw of that type in-order.
 *	Iterator HW pointer will be null on failure to find hw.
 * @rm: SDE Resource Manager handle
 * @iter: iterator object
 * @Return: true on match found, false on no match found
 */
bool sde_rm_get_hw(struct sde_rm *rm, struct sde_rm_hw_iter *iter);

/**
 * sde_rm_check_property_topctl - validate property bitmask before it is set
 * @val: user's proposed topology control bitmask
 * @Return: 0 on success or error
 */
int sde_rm_check_property_topctl(uint64_t val);

/**
 * sde_rm_check_property_topctl - validate property bitmask before it is set
 * @val: user's proposed topology control bitmask
 * @Return: 0 on success or error
 */
int sde_rm_check_property_topctl(uint64_t val);

#endif /* __SDE_RM_H__ */