1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (c) 2018, Linaro Ltd. 4 * Author: Georgi Djakov <[email protected]> 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_onecell_data - driver data for onecell interconnect providers 19 * 20 * @num_nodes: number of nodes in this device 21 * @nodes: array of pointers to the nodes in this device 22 */ 23 struct icc_onecell_data { 24 unsigned int num_nodes; 25 struct icc_node *nodes[]; 26 }; 27 28 struct icc_node *of_icc_xlate_onecell(struct of_phandle_args *spec, 29 void *data); 30 31 /** 32 * struct icc_provider - interconnect provider (controller) entity that might 33 * provide multiple interconnect controls 34 * 35 * @provider_list: list of the registered interconnect providers 36 * @nodes: internal list of the interconnect provider nodes 37 * @set: pointer to device specific set operation function 38 * @aggregate: pointer to device specific aggregate operation function 39 * @pre_aggregate: pointer to device specific function that is called 40 * before the aggregation begins (optional) 41 * @xlate: provider-specific callback for mapping nodes from phandle arguments 42 * @dev: the device this interconnect provider belongs to 43 * @users: count of active users 44 * @inter_set: whether inter-provider pairs will be configured with @set 45 * @data: pointer to private data 46 */ 47 struct icc_provider { 48 struct list_head provider_list; 49 struct list_head nodes; 50 int (*set)(struct icc_node *src, struct icc_node *dst); 51 int (*aggregate)(struct icc_node *node, u32 tag, u32 avg_bw, 52 u32 peak_bw, u32 *agg_avg, u32 *agg_peak); 53 void (*pre_aggregate)(struct icc_node *node); 54 struct icc_node* (*xlate)(struct of_phandle_args *spec, void *data); 55 struct device *dev; 56 int users; 57 bool inter_set; 58 void *data; 59 }; 60 61 /** 62 * struct icc_node - entity that is part of the interconnect topology 63 * 64 * @id: platform specific node id 65 * @name: node name used in debugfs 66 * @links: a list of targets pointing to where we can go next when traversing 67 * @num_links: number of links to other interconnect nodes 68 * @provider: points to the interconnect provider of this node 69 * @node_list: the list entry in the parent provider's "nodes" list 70 * @search_list: list used when walking the nodes graph 71 * @reverse: pointer to previous node when walking the nodes graph 72 * @is_traversed: flag that is used when walking the nodes graph 73 * @req_list: a list of QoS constraint requests associated with this node 74 * @avg_bw: aggregated value of average bandwidth requests from all consumers 75 * @peak_bw: aggregated value of peak bandwidth requests from all consumers 76 * @data: pointer to private data 77 */ 78 struct icc_node { 79 int id; 80 const char *name; 81 struct icc_node **links; 82 size_t num_links; 83 84 struct icc_provider *provider; 85 struct list_head node_list; 86 struct list_head search_list; 87 struct icc_node *reverse; 88 u8 is_traversed:1; 89 struct hlist_head req_list; 90 u32 avg_bw; 91 u32 peak_bw; 92 void *data; 93 }; 94 95 #if IS_ENABLED(CONFIG_INTERCONNECT) 96 97 int icc_std_aggregate(struct icc_node *node, u32 tag, u32 avg_bw, 98 u32 peak_bw, u32 *agg_avg, u32 *agg_peak); 99 struct icc_node *icc_node_create(int id); 100 void icc_node_destroy(int id); 101 int icc_link_create(struct icc_node *node, const int dst_id); 102 int icc_link_destroy(struct icc_node *src, struct icc_node *dst); 103 void icc_node_add(struct icc_node *node, struct icc_provider *provider); 104 void icc_node_del(struct icc_node *node); 105 int icc_nodes_remove(struct icc_provider *provider); 106 int icc_provider_add(struct icc_provider *provider); 107 int icc_provider_del(struct icc_provider *provider); 108 struct icc_node *of_icc_get_from_provider(struct of_phandle_args *spec); 109 110 #else 111 112 static inline int icc_std_aggregate(struct icc_node *node, u32 tag, u32 avg_bw, 113 u32 peak_bw, u32 *agg_avg, u32 *agg_peak) 114 { 115 return -ENOTSUPP; 116 } 117 118 static inline struct icc_node *icc_node_create(int id) 119 { 120 return ERR_PTR(-ENOTSUPP); 121 } 122 123 static inline void icc_node_destroy(int id) 124 { 125 } 126 127 static inline int icc_link_create(struct icc_node *node, const int dst_id) 128 { 129 return -ENOTSUPP; 130 } 131 132 static inline int icc_link_destroy(struct icc_node *src, struct icc_node *dst) 133 { 134 return -ENOTSUPP; 135 } 136 137 static inline void icc_node_add(struct icc_node *node, struct icc_provider *provider) 138 { 139 } 140 141 static inline void icc_node_del(struct icc_node *node) 142 { 143 } 144 145 static inline int icc_nodes_remove(struct icc_provider *provider) 146 { 147 return -ENOTSUPP; 148 } 149 150 static inline int icc_provider_add(struct icc_provider *provider) 151 { 152 return -ENOTSUPP; 153 } 154 155 static inline int icc_provider_del(struct icc_provider *provider) 156 { 157 return -ENOTSUPP; 158 } 159 160 static inline struct icc_node *of_icc_get_from_provider(struct of_phandle_args *spec) 161 { 162 return ERR_PTR(-ENOTSUPP); 163 } 164 165 #endif /* CONFIG_INTERCONNECT */ 166 167 #endif /* __LINUX_INTERCONNECT_PROVIDER_H */ 168