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