summaryrefslogtreecommitdiff
path: root/include/linux/interconnect-provider.h
blob: b16f9effa555417cad9627af1d81d9722d1cd750 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
/* 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_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)
 * @xlate: provider-specific callback for mapping nodes from phandle arguments
 * @dev: the device this interconnect provider belongs to
 * @users: count of active users
 * @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);
	struct icc_node* (*xlate)(struct of_phandle_args *spec, void *data);
	struct device		*dev;
	int			users;
	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
 * @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;
	void			*data;
};

#if IS_ENABLED(CONFIG_INTERCONNECT)

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);
int icc_link_destroy(struct icc_node *src, struct icc_node *dst);
void icc_node_add(struct icc_node *node, struct icc_provider *provider);
void icc_node_del(struct icc_node *node);
int icc_provider_add(struct icc_provider *provider);
int icc_provider_del(struct icc_provider *provider);

#else

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

void icc_node_destroy(int id)
{
}

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

int icc_link_destroy(struct icc_node *src, struct icc_node *dst)
{
	return -ENOTSUPP;
}

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

void icc_node_del(struct icc_node *node)
{
}

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

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

#endif /* CONFIG_INTERCONNECT */

#endif /* __LINUX_INTERCONNECT_PROVIDER_H */