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;
15 struct of_phandle_args;
16
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
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[] __counted_by(num_nodes);
37 };
38
39 struct icc_node *of_icc_xlate_onecell(const struct of_phandle_args *spec,
40 void *data);
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
50 * @pre_aggregate: pointer to device specific function that is called
51 * before the aggregation begins (optional)
52 * @get_bw: pointer to device specific function to get current bandwidth
53 * @xlate: provider-specific callback for mapping nodes from phandle arguments
54 * @xlate_extended: vendor-specific callback for mapping node data from phandle arguments
55 * @dev: the device this interconnect provider belongs to
56 * @users: count of active users
57 * @inter_set: whether inter-provider pairs will be configured with @set
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);
64 int (*aggregate)(struct icc_node *node, u32 tag, u32 avg_bw,
65 u32 peak_bw, u32 *agg_avg, u32 *agg_peak);
66 void (*pre_aggregate)(struct icc_node *node);
67 int (*get_bw)(struct icc_node *node, u32 *avg, u32 *peak);
68 struct icc_node* (*xlate)(const struct of_phandle_args *spec, void *data);
69 struct icc_node_data* (*xlate_extended)(const struct of_phandle_args *spec,
70 void *data);
71 struct device *dev;
72 int users;
73 bool inter_set;
74 void *data;
75 };
76
77 /**
78 * struct icc_node - entity that is part of the interconnect topology
79 *
80 * @id: platform specific node id
81 * @name: node name used in debugfs
82 * @links: a list of targets pointing to where we can go next when traversing
83 * @num_links: number of links to other interconnect nodes
84 * @provider: points to the interconnect provider of this node
85 * @node_list: the list entry in the parent provider's "nodes" list
86 * @search_list: list used when walking the nodes graph
87 * @reverse: pointer to previous node when walking the nodes graph
88 * @is_traversed: flag that is used when walking the nodes graph
89 * @req_list: a list of QoS constraint requests associated with this node
90 * @avg_bw: aggregated value of average bandwidth requests from all consumers
91 * @peak_bw: aggregated value of peak bandwidth requests from all consumers
92 * @init_avg: average bandwidth value that is read from the hardware during init
93 * @init_peak: peak bandwidth value that is read from the hardware during init
94 * @data: pointer to private data
95 */
96 struct icc_node {
97 int id;
98 const char *name;
99 struct icc_node **links;
100 size_t num_links;
101
102 struct icc_provider *provider;
103 struct list_head node_list;
104 struct list_head search_list;
105 struct icc_node *reverse;
106 u8 is_traversed:1;
107 struct hlist_head req_list;
108 u32 avg_bw;
109 u32 peak_bw;
110 u32 init_avg;
111 u32 init_peak;
112 void *data;
113 };
114
115 #if IS_ENABLED(CONFIG_INTERCONNECT)
116
117 int icc_std_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
118 u32 peak_bw, u32 *agg_avg, u32 *agg_peak);
119 struct icc_node *icc_node_create(int id);
120 void icc_node_destroy(int id);
121 int icc_link_create(struct icc_node *node, const int dst_id);
122 void icc_node_add(struct icc_node *node, struct icc_provider *provider);
123 void icc_node_del(struct icc_node *node);
124 int icc_nodes_remove(struct icc_provider *provider);
125 void icc_provider_init(struct icc_provider *provider);
126 int icc_provider_register(struct icc_provider *provider);
127 void icc_provider_deregister(struct icc_provider *provider);
128 struct icc_node_data *of_icc_get_from_provider(const struct of_phandle_args *spec);
129 void icc_sync_state(struct device *dev);
130
131 #else
132
icc_std_aggregate(struct icc_node * node,u32 tag,u32 avg_bw,u32 peak_bw,u32 * agg_avg,u32 * agg_peak)133 static inline int icc_std_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
134 u32 peak_bw, u32 *agg_avg, u32 *agg_peak)
135 {
136 return -ENOTSUPP;
137 }
138
icc_node_create(int id)139 static inline struct icc_node *icc_node_create(int id)
140 {
141 return ERR_PTR(-ENOTSUPP);
142 }
143
icc_node_destroy(int id)144 static inline void icc_node_destroy(int id)
145 {
146 }
147
icc_link_create(struct icc_node * node,const int dst_id)148 static inline int icc_link_create(struct icc_node *node, const int dst_id)
149 {
150 return -ENOTSUPP;
151 }
152
icc_node_add(struct icc_node * node,struct icc_provider * provider)153 static inline void icc_node_add(struct icc_node *node, struct icc_provider *provider)
154 {
155 }
156
icc_node_del(struct icc_node * node)157 static inline void icc_node_del(struct icc_node *node)
158 {
159 }
160
icc_nodes_remove(struct icc_provider * provider)161 static inline int icc_nodes_remove(struct icc_provider *provider)
162 {
163 return -ENOTSUPP;
164 }
165
icc_provider_init(struct icc_provider * provider)166 static inline void icc_provider_init(struct icc_provider *provider) { }
167
icc_provider_register(struct icc_provider * provider)168 static inline int icc_provider_register(struct icc_provider *provider)
169 {
170 return -ENOTSUPP;
171 }
172
icc_provider_deregister(struct icc_provider * provider)173 static inline void icc_provider_deregister(struct icc_provider *provider) { }
174
of_icc_get_from_provider(const struct of_phandle_args * spec)175 static inline struct icc_node_data *of_icc_get_from_provider(const struct of_phandle_args *spec)
176 {
177 return ERR_PTR(-ENOTSUPP);
178 }
179
180 #endif /* CONFIG_INTERCONNECT */
181
182 #endif /* __LINUX_INTERCONNECT_PROVIDER_H */
183