[linux-block.git] / include / linux / interconnect-provider.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (c) 2018, Linaro Ltd.
 * Author: Georgi Djakov <georgi.djakov@linaro.org>
 */

#ifndef __LINUX_INTERCONNECT_PROVIDER_H
#define __LINUX_INTERCONNECT_PROVIDER_H

#include <linux/interconnect.h>

#define icc_units_to_bps(bw)  ((bw) * 1000ULL)

struct icc_node;
struct of_phandle_args;

/**
 * struct icc_node_data - icc node data
 *
 * @node: icc node
 * @tag: tag
 */
struct icc_node_data {
	struct icc_node *node;
	u32 tag;
};

/**
 * struct icc_onecell_data - driver data for onecell interconnect providers
 *
 * @num_nodes: number of nodes in this device
 * @nodes: array of pointers to the nodes in this device
 */
struct icc_onecell_data {
	unsigned int num_nodes;
	struct icc_node *nodes[];
};

struct icc_node *of_icc_xlate_onecell(struct of_phandle_args *spec,
				      void *data);

/**
 * struct icc_provider - interconnect provider (controller) entity that might
 * provide multiple interconnect controls
 *
 * @provider_list: list of the registered interconnect providers
 * @nodes: internal list of the interconnect provider nodes
 * @set: pointer to device specific set operation function
 * @aggregate: pointer to device specific aggregate operation function
 * @pre_aggregate: pointer to device specific function that is called
 *		   before the aggregation begins (optional)
 * @get_bw: pointer to device specific function to get current bandwidth
 * @xlate: provider-specific callback for mapping nodes from phandle arguments
 * @xlate_extended: vendor-specific callback for mapping node data from phandle arguments
 * @dev: the device this interconnect provider belongs to
 * @users: count of active users
 * @inter_set: whether inter-provider pairs will be configured with @set
 * @data: pointer to private data
 */
struct icc_provider {
	struct list_head	provider_list;
	struct list_head	nodes;
	int (*set)(struct icc_node *src, struct icc_node *dst);
	int (*aggregate)(struct icc_node *node, u32 tag, u32 avg_bw,
			 u32 peak_bw, u32 *agg_avg, u32 *agg_peak);
	void (*pre_aggregate)(struct icc_node *node);
	int (*get_bw)(struct icc_node *node, u32 *avg, u32 *peak);
	struct icc_node* (*xlate)(struct of_phandle_args *spec, void *data);
	struct icc_node_data* (*xlate_extended)(struct of_phandle_args *spec, void *data);
	struct device		*dev;
	int			users;
	bool			inter_set;
	void			*data;
};

/**
 * struct icc_node - entity that is part of the interconnect topology
 *
 * @id: platform specific node id
 * @name: node name used in debugfs
 * @links: a list of targets pointing to where we can go next when traversing
 * @num_links: number of links to other interconnect nodes
 * @provider: points to the interconnect provider of this node
 * @node_list: the list entry in the parent provider's "nodes" list
 * @search_list: list used when walking the nodes graph
 * @reverse: pointer to previous node when walking the nodes graph
 * @is_traversed: flag that is used when walking the nodes graph
 * @req_list: a list of QoS constraint requests associated with this node
 * @avg_bw: aggregated value of average bandwidth requests from all consumers
 * @peak_bw: aggregated value of peak bandwidth requests from all consumers
 * @init_avg: average bandwidth value that is read from the hardware during init
 * @init_peak: peak bandwidth value that is read from the hardware during init
 * @data: pointer to private data
 */
struct icc_node {
	int			id;
	const char              *name;
	struct icc_node		**links;
	size_t			num_links;

	struct icc_provider	*provider;
	struct list_head	node_list;
	struct list_head	search_list;
	struct icc_node		*reverse;
	u8			is_traversed:1;
	struct hlist_head	req_list;
	u32			avg_bw;
	u32			peak_bw;
	u32			init_avg;
	u32			init_peak;
	void			*data;
};

#if IS_ENABLED(CONFIG_INTERCONNECT)

int icc_std_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
		      u32 peak_bw, u32 *agg_avg, u32 *agg_peak);
struct icc_node *icc_node_create(int id);
void icc_node_destroy(int id);
int icc_link_create(struct icc_node *node, const int dst_id);
void icc_node_add(struct icc_node *node, struct icc_provider *provider);
void icc_node_del(struct icc_node *node);
int icc_nodes_remove(struct icc_provider *provider);
void icc_provider_init(struct icc_provider *provider);
int icc_provider_register(struct icc_provider *provider);
void icc_provider_deregister(struct icc_provider *provider);
struct icc_node_data *of_icc_get_from_provider(struct of_phandle_args *spec);
void icc_sync_state(struct device *dev);

#else

static inline int icc_std_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
				    u32 peak_bw, u32 *agg_avg, u32 *agg_peak)
{
	return -ENOTSUPP;
}

static inline struct icc_node *icc_node_create(int id)
{
	return ERR_PTR(-ENOTSUPP);
}

static inline void icc_node_destroy(int id)
{
}

static inline int icc_link_create(struct icc_node *node, const int dst_id)
{
	return -ENOTSUPP;
}

static inline void icc_node_add(struct icc_node *node, struct icc_provider *provider)
{
}

static inline void icc_node_del(struct icc_node *node)
{
}

static inline int icc_nodes_remove(struct icc_provider *provider)
{
	return -ENOTSUPP;
}

static inline void icc_provider_init(struct icc_provider *provider) { }

static inline int icc_provider_register(struct icc_provider *provider)
{
	return -ENOTSUPP;
}

static inline void icc_provider_deregister(struct icc_provider *provider) { }

static inline struct icc_node_data *of_icc_get_from_provider(struct of_phandle_args *spec)
{
	return ERR_PTR(-ENOTSUPP);
}

#endif /* CONFIG_INTERCONNECT */

#endif /* __LINUX_INTERCONNECT_PROVIDER_H */
Commit	Line	Data
11f1ceca GD	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	/*
	3	* Copyright (c) 2018, Linaro Ltd.
	4	* Author: Georgi Djakov <georgi.djakov@linaro.org>
	5	*/
	6
	7	#ifndef __LINUX_INTERCONNECT_PROVIDER_H
	8	#define __LINUX_INTERCONNECT_PROVIDER_H
	9
	10	#include <linux/interconnect.h>
	11
	12	#define icc_units_to_bps(bw) ((bw) * 1000ULL)
	13
	14	struct icc_node;
87e3031b GD	15	struct of_phandle_args;
87e3031b GD	16
1521e22b GD	17	/**
	18	* struct icc_node_data - icc node data
	19	*
	20	* @node: icc node
	21	* @tag: tag
	22	*/
	23	struct icc_node_data {
	24	struct icc_node *node;
	25	u32 tag;
	26	};
	27
87e3031b GD	28	/**
	29	* struct icc_onecell_data - driver data for onecell interconnect providers
	30	*
	31	* @num_nodes: number of nodes in this device
	32	* @nodes: array of pointers to the nodes in this device
	33	*/
	34	struct icc_onecell_data {
	35	unsigned int num_nodes;
	36	struct icc_node *nodes[];
	37	};
	38
	39	struct icc_node of_icc_xlate_onecell(struct of_phandle_args spec,
	40	void *data);
11f1ceca GD	41
	42	/**
	43	* struct icc_provider - interconnect provider (controller) entity that might
	44	* provide multiple interconnect controls
	45	*
	46	* @provider_list: list of the registered interconnect providers
	47	* @nodes: internal list of the interconnect provider nodes
	48	* @set: pointer to device specific set operation function
	49	* @aggregate: pointer to device specific aggregate operation function
cbd5a9c2 GD	50	* @pre_aggregate: pointer to device specific function that is called
cbd5a9c2 GD	51	* before the aggregation begins (optional)
cc80d10d	52	* @get_bw: pointer to device specific function to get current bandwidth
87e3031b	53	* @xlate: provider-specific callback for mapping nodes from phandle arguments
1521e22b	54	* @xlate_extended: vendor-specific callback for mapping node data from phandle arguments
11f1ceca GD	55	* @dev: the device this interconnect provider belongs to
11f1ceca GD	56	* @users: count of active users
65461e26	57	* @inter_set: whether inter-provider pairs will be configured with @set
11f1ceca GD	58	* @data: pointer to private data
	59	*/
	60	struct icc_provider {
	61	struct list_head provider_list;
	62	struct list_head nodes;
	63	int (set)(struct icc_node src, struct icc_node *dst);
127ab2cc GD	64	int (aggregate)(struct icc_node node, u32 tag, u32 avg_bw,
127ab2cc GD	65	u32 peak_bw, u32 agg_avg, u32 agg_peak);
cbd5a9c2	66	void (pre_aggregate)(struct icc_node node);
cc80d10d	67	int (get_bw)(struct icc_node node, u32 avg, u32 peak);
87e3031b	68	struct icc_node* (xlate)(struct of_phandle_args spec, void *data);
1521e22b	69	struct icc_node_data* (xlate_extended)(struct of_phandle_args spec, void *data);
11f1ceca GD	70	struct device *dev;
11f1ceca GD	71	int users;
65461e26	72	bool inter_set;
11f1ceca GD	73	void *data;
	74	};
	75
	76	/**
	77	* struct icc_node - entity that is part of the interconnect topology
	78	*
	79	* @id: platform specific node id
	80	* @name: node name used in debugfs
	81	* @links: a list of targets pointing to where we can go next when traversing
	82	* @num_links: number of links to other interconnect nodes
	83	* @provider: points to the interconnect provider of this node
	84	* @node_list: the list entry in the parent provider's "nodes" list
	85	* @search_list: list used when walking the nodes graph
	86	* @reverse: pointer to previous node when walking the nodes graph
	87	* @is_traversed: flag that is used when walking the nodes graph
	88	* @req_list: a list of QoS constraint requests associated with this node
	89	* @avg_bw: aggregated value of average bandwidth requests from all consumers
	90	* @peak_bw: aggregated value of peak bandwidth requests from all consumers
b1d681d8 GD	91	* @init_avg: average bandwidth value that is read from the hardware during init
b1d681d8 GD	92	* @init_peak: peak bandwidth value that is read from the hardware during init
11f1ceca GD	93	* @data: pointer to private data
	94	*/
	95	struct icc_node {
	96	int id;
	97	const char *name;
	98	struct icc_node **links;
	99	size_t num_links;
	100
	101	struct icc_provider *provider;
	102	struct list_head node_list;
	103	struct list_head search_list;
	104	struct icc_node *reverse;
	105	u8 is_traversed:1;
	106	struct hlist_head req_list;
	107	u32 avg_bw;
	108	u32 peak_bw;
b1d681d8 GD	109	u32 init_avg;
b1d681d8 GD	110	u32 init_peak;
11f1ceca GD	111	void *data;
	112	};
	113
	114	#if IS_ENABLED(CONFIG_INTERCONNECT)
	115
3172e4d2 GD	116	int icc_std_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
3172e4d2 GD	117	u32 peak_bw, u32 agg_avg, u32 agg_peak);
11f1ceca GD	118	struct icc_node *icc_node_create(int id);
	119	void icc_node_destroy(int id);
	120	int icc_link_create(struct icc_node *node, const int dst_id);
11f1ceca GD	121	void icc_node_add(struct icc_node node, struct icc_provider provider);
11f1ceca GD	122	void icc_node_del(struct icc_node *node);
3cce2c6f	123	int icc_nodes_remove(struct icc_provider *provider);
eb59eca0 JH	124	void icc_provider_init(struct icc_provider *provider);
	125	int icc_provider_register(struct icc_provider *provider);
	126	void icc_provider_deregister(struct icc_provider *provider);
1521e22b	127	struct icc_node_data of_icc_get_from_provider(struct of_phandle_args spec);
b1d681d8	128	void icc_sync_state(struct device *dev);
11f1ceca GD	129
	130	#else
	131
3172e4d2 GD	132	static inline int icc_std_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
	133	u32 peak_bw, u32 agg_avg, u32 agg_peak)
	134	{
	135	return -ENOTSUPP;
	136	}
	137
11f1ceca GD	138	static inline struct icc_node *icc_node_create(int id)
	139	{
	140	return ERR_PTR(-ENOTSUPP);
	141	}
	142
12a400b0	143	static inline void icc_node_destroy(int id)
11f1ceca GD	144	{
	145	}
	146
	147	static inline int icc_link_create(struct icc_node *node, const int dst_id)
	148	{
	149	return -ENOTSUPP;
	150	}
	151
12a400b0	152	static inline void icc_node_add(struct icc_node node, struct icc_provider provider)
11f1ceca GD	153	{
	154	}
	155
12a400b0	156	static inline void icc_node_del(struct icc_node *node)
11f1ceca GD	157	{
	158	}
	159
3cce2c6f GD	160	static inline int icc_nodes_remove(struct icc_provider *provider)
	161	{
	162	return -ENOTSUPP;
	163	}
	164
eb59eca0 JH	165	static inline void icc_provider_init(struct icc_provider *provider) { }
	166
	167	static inline int icc_provider_register(struct icc_provider *provider)
	168	{
	169	return -ENOTSUPP;
	170	}
	171
	172	static inline void icc_provider_deregister(struct icc_provider *provider) { }
	173
1521e22b	174	static inline struct icc_node_data of_icc_get_from_provider(struct of_phandle_args spec)
8a307d36 AŚ	175	{
	176	return ERR_PTR(-ENOTSUPP);
	177	}
	178
11f1ceca GD	179	#endif /* CONFIG_INTERCONNECT */
	180
	181	#endif /* __LINUX_INTERCONNECT_PROVIDER_H */