include/linux/interconnect-provider.h

   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[];
  37 };
  38
  39 struct icc_node *of_icc_xlate_onecell(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)(struct of_phandle_args *spec, void *data);
  69         struct icc_node_data* (*xlate_extended)(struct of_phandle_args *spec, void *data);
  70         struct device           *dev;
  71         int                     users;
  72         bool                    inter_set;
  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
  91  * @init_avg: average bandwidth value that is read from the hardware during init
  92  * @init_peak: peak bandwidth value that is read from the hardware during init
  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;
 109         u32                     init_avg;
 110         u32                     init_peak;
 111         void                    *data;
 112 };
 113
 114 #if IS_ENABLED(CONFIG_INTERCONNECT)
 115
 116 int icc_std_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
 117                       u32 peak_bw, u32 *agg_avg, u32 *agg_peak);
 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);
 121 int icc_link_destroy(struct icc_node *src, struct icc_node *dst);
 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 int icc_provider_add(struct icc_provider *provider);
 126 int icc_provider_del(struct icc_provider *provider);
 127 struct icc_node_data *of_icc_get_from_provider(struct of_phandle_args *spec);
 128 void icc_sync_state(struct device *dev);
 129
 130 #else
 131
 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
 138 static inline struct icc_node *icc_node_create(int id)
 139 {
 140         return ERR_PTR(-ENOTSUPP);
 141 }
 142
 143 static inline void icc_node_destroy(int id)
 144 {
 145 }
 146
 147 static inline int icc_link_create(struct icc_node *node, const int dst_id)
 148 {
 149         return -ENOTSUPP;
 150 }
 151
 152 static inline int icc_link_destroy(struct icc_node *src, struct icc_node *dst)
 153 {
 154         return -ENOTSUPP;
 155 }
 156
 157 static inline void icc_node_add(struct icc_node *node, struct icc_provider *provider)
 158 {
 159 }
 160
 161 static inline void icc_node_del(struct icc_node *node)
 162 {
 163 }
 164
 165 static inline int icc_nodes_remove(struct icc_provider *provider)
 166 {
 167         return -ENOTSUPP;
 168 }
 169
 170 static inline int icc_provider_add(struct icc_provider *provider)
 171 {
 172         return -ENOTSUPP;
 173 }
 174
 175 static inline int icc_provider_del(struct icc_provider *provider)
 176 {
 177         return -ENOTSUPP;
 178 }
 179
 180 static inline struct icc_node_data *of_icc_get_from_provider(struct of_phandle_args *spec)
 181 {
 182         return ERR_PTR(-ENOTSUPP);
 183 }
 184
 185 #endif /* CONFIG_INTERCONNECT */
 186
 187 #endif /* __LINUX_INTERCONNECT_PROVIDER_H */