146 lines
4.1 KiB
C
146 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2018, Linaro Ltd.
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* Author: Georgi Djakov <georgi.djakov@linaro.org>
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*/
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#ifndef __LINUX_INTERCONNECT_PROVIDER_H
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#define __LINUX_INTERCONNECT_PROVIDER_H
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#include <linux/interconnect.h>
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#define icc_units_to_bps(bw) ((bw) * 1000ULL)
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struct icc_node;
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struct of_phandle_args;
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/**
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* struct icc_onecell_data - driver data for onecell interconnect providers
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*
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* @num_nodes: number of nodes in this device
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* @nodes: array of pointers to the nodes in this device
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*/
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struct icc_onecell_data {
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unsigned int num_nodes;
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struct icc_node *nodes[];
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};
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struct icc_node *of_icc_xlate_onecell(struct of_phandle_args *spec,
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void *data);
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/**
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* struct icc_provider - interconnect provider (controller) entity that might
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* provide multiple interconnect controls
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*
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* @provider_list: list of the registered interconnect providers
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* @nodes: internal list of the interconnect provider nodes
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* @set: pointer to device specific set operation function
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* @aggregate: pointer to device specific aggregate operation function
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* @pre_aggregate: pointer to device specific function that is called
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* before the aggregation begins (optional)
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* @xlate: provider-specific callback for mapping nodes from phandle arguments
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* @dev: the device this interconnect provider belongs to
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* @users: count of active users
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* @data: pointer to private data
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*/
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struct icc_provider {
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struct list_head provider_list;
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struct list_head nodes;
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int (*set)(struct icc_node *src, struct icc_node *dst);
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int (*aggregate)(struct icc_node *node, u32 tag, u32 avg_bw,
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u32 peak_bw, u32 *agg_avg, u32 *agg_peak);
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void (*pre_aggregate)(struct icc_node *node);
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struct icc_node* (*xlate)(struct of_phandle_args *spec, void *data);
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struct device *dev;
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int users;
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void *data;
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};
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/**
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* struct icc_node - entity that is part of the interconnect topology
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*
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* @id: platform specific node id
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* @name: node name used in debugfs
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* @links: a list of targets pointing to where we can go next when traversing
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* @num_links: number of links to other interconnect nodes
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* @provider: points to the interconnect provider of this node
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* @node_list: the list entry in the parent provider's "nodes" list
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* @search_list: list used when walking the nodes graph
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* @reverse: pointer to previous node when walking the nodes graph
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* @is_traversed: flag that is used when walking the nodes graph
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* @req_list: a list of QoS constraint requests associated with this node
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* @avg_bw: aggregated value of average bandwidth requests from all consumers
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* @peak_bw: aggregated value of peak bandwidth requests from all consumers
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* @data: pointer to private data
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*/
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struct icc_node {
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int id;
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const char *name;
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struct icc_node **links;
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size_t num_links;
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struct icc_provider *provider;
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struct list_head node_list;
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struct list_head search_list;
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struct icc_node *reverse;
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u8 is_traversed:1;
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struct hlist_head req_list;
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u32 avg_bw;
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u32 peak_bw;
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void *data;
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};
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#if IS_ENABLED(CONFIG_INTERCONNECT)
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struct icc_node *icc_node_create(int id);
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void icc_node_destroy(int id);
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int icc_link_create(struct icc_node *node, const int dst_id);
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int icc_link_destroy(struct icc_node *src, struct icc_node *dst);
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void icc_node_add(struct icc_node *node, struct icc_provider *provider);
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void icc_node_del(struct icc_node *node);
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int icc_provider_add(struct icc_provider *provider);
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int icc_provider_del(struct icc_provider *provider);
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#else
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static inline struct icc_node *icc_node_create(int id)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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void icc_node_destroy(int id)
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{
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}
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static inline int icc_link_create(struct icc_node *node, const int dst_id)
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{
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return -ENOTSUPP;
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}
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int icc_link_destroy(struct icc_node *src, struct icc_node *dst)
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{
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return -ENOTSUPP;
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}
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void icc_node_add(struct icc_node *node, struct icc_provider *provider)
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{
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}
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void icc_node_del(struct icc_node *node)
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{
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}
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static inline int icc_provider_add(struct icc_provider *provider)
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{
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return -ENOTSUPP;
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}
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static inline int icc_provider_del(struct icc_provider *provider)
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{
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return -ENOTSUPP;
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}
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#endif /* CONFIG_INTERCONNECT */
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#endif /* __LINUX_INTERCONNECT_PROVIDER_H */
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