root/include/linux/interconnect-provider.h

INCLUDED FROM

DEFINITIONS

1. icc_node_create
2. icc_node_destroy
3. icc_link_create
4. icc_link_destroy
5. icc_node_add
6. icc_node_del
7. icc_provider_add
8. icc_provider_del

   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_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  * @data: pointer to private data
  45  */
  46 struct icc_provider {
  47         struct list_head        provider_list;
  48         struct list_head        nodes;
  49         int (*set)(struct icc_node *src, struct icc_node *dst);
  50         int (*aggregate)(struct icc_node *node, u32 tag, u32 avg_bw,
  51                          u32 peak_bw, u32 *agg_avg, u32 *agg_peak);
  52         void (*pre_aggregate)(struct icc_node *node);
  53         struct icc_node* (*xlate)(struct of_phandle_args *spec, void *data);
  54         struct device           *dev;
  55         int                     users;
  56         void                    *data;
  57 };
  58 
  59 /**
  60  * struct icc_node - entity that is part of the interconnect topology
  61  *
  62  * @id: platform specific node id
  63  * @name: node name used in debugfs
  64  * @links: a list of targets pointing to where we can go next when traversing
  65  * @num_links: number of links to other interconnect nodes
  66  * @provider: points to the interconnect provider of this node
  67  * @node_list: the list entry in the parent provider's "nodes" list
  68  * @search_list: list used when walking the nodes graph
  69  * @reverse: pointer to previous node when walking the nodes graph
  70  * @is_traversed: flag that is used when walking the nodes graph
  71  * @req_list: a list of QoS constraint requests associated with this node
  72  * @avg_bw: aggregated value of average bandwidth requests from all consumers
  73  * @peak_bw: aggregated value of peak bandwidth requests from all consumers
  74  * @data: pointer to private data
  75  */
  76 struct icc_node {
  77         int                     id;
  78         const char              *name;
  79         struct icc_node         **links;
  80         size_t                  num_links;
  81 
  82         struct icc_provider     *provider;
  83         struct list_head        node_list;
  84         struct list_head        search_list;
  85         struct icc_node         *reverse;
  86         u8                      is_traversed:1;
  87         struct hlist_head       req_list;
  88         u32                     avg_bw;
  89         u32                     peak_bw;
  90         void                    *data;
  91 };
  92 
  93 #if IS_ENABLED(CONFIG_INTERCONNECT)
  94 
  95 struct icc_node *icc_node_create(int id);
  96 void icc_node_destroy(int id);
  97 int icc_link_create(struct icc_node *node, const int dst_id);
  98 int icc_link_destroy(struct icc_node *src, struct icc_node *dst);
  99 void icc_node_add(struct icc_node *node, struct icc_provider *provider);
 100 void icc_node_del(struct icc_node *node);
 101 int icc_provider_add(struct icc_provider *provider);
 102 int icc_provider_del(struct icc_provider *provider);
 103 
 104 #else
 105 
 106 static inline struct icc_node *icc_node_create(int id)
 107 {
 108         return ERR_PTR(-ENOTSUPP);
 109 }
 110 
 111 void icc_node_destroy(int id)
 112 {
 113 }
 114 
 115 static inline int icc_link_create(struct icc_node *node, const int dst_id)
 116 {
 117         return -ENOTSUPP;
 118 }
 119 
 120 int icc_link_destroy(struct icc_node *src, struct icc_node *dst)
 121 {
 122         return -ENOTSUPP;
 123 }
 124 
 125 void icc_node_add(struct icc_node *node, struct icc_provider *provider)
 126 {
 127 }
 128 
 129 void icc_node_del(struct icc_node *node)
 130 {
 131 }
 132 
 133 static inline int icc_provider_add(struct icc_provider *provider)
 134 {
 135         return -ENOTSUPP;
 136 }
 137 
 138 static inline int icc_provider_del(struct icc_provider *provider)
 139 {
 140         return -ENOTSUPP;
 141 }
 142 
 143 #endif /* CONFIG_INTERCONNECT */
 144 
 145 #endif /* __LINUX_INTERCONNECT_PROVIDER_H */