/* SPDX-License-Identifier: GPL-2.0 */
/*
* include / linux / node . h - generic node definition
*
* This is mainly for topological representation . We define the
* basic ' struct node ' here , which can be embedded in per - arch
* definitions of processors .
*
* Basic handling of the devices is done in drivers / base / node . c
* and system devices are handled in drivers / base / sys . c .
*
* Nodes are exported via driverfs in the class / node / devices /
* directory .
*/
#ifndef _LINUX_NODE_H_
#define _LINUX_NODE_H_
#include <linux/device.h>
#include <linux/list.h>
/**
* struct access_coordinate - generic performance coordinates container
*
* @ read_bandwidth : Read bandwidth in MB / s
* @ write_bandwidth : Write bandwidth in MB / s
* @ read_latency : Read latency in nanoseconds
* @ write_latency : Write latency in nanoseconds
*/
struct access_coordinate {
unsigned int read_bandwidth;
unsigned int write_bandwidth;
unsigned int read_latency;
unsigned int write_latency;
};
/*
* ACCESS_COORDINATE_LOCAL correlates to ACCESS CLASS 0
* - access_coordinate between target node and nearest initiator node
* ACCESS_COORDINATE_CPU correlates to ACCESS CLASS 1
* - access_coordinate between target node and nearest CPU node
*/
enum access_coordinate_class {
ACCESS_COORDINATE_LOCAL,
ACCESS_COORDINATE_CPU,
ACCESS_COORDINATE_MAX
};
enum cache_indexing {
NODE_CACHE_DIRECT_MAP,
NODE_CACHE_INDEXED,
NODE_CACHE_OTHER,
};
enum cache_write_policy {
NODE_CACHE_WRITE_BACK,
NODE_CACHE_WRITE_THROUGH,
NODE_CACHE_WRITE_OTHER,
};
enum cache_mode {
NODE_CACHE_ADDR_MODE_RESERVED,
NODE_CACHE_ADDR_MODE_EXTENDED_LINEAR,
};
/**
* struct node_cache_attrs - system memory caching attributes
*
* @ indexing : The ways memory blocks may be placed in cache
* @ write_policy : Write back or write through policy
* @ size : Total size of cache in bytes
* @ line_size : Number of bytes fetched on a cache miss
* @ level : The cache hierarchy level
* @ address_mode : The address mode
*/
struct node_cache_attrs {
enum cache_indexing indexing;
enum cache_write_policy write_policy;
u64 size;
u16 line_size;
u8 level;
u16 address_mode;
};
#ifdef CONFIG_HMEM_REPORTING
void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs);
void node_set_perf_attrs(unsigned int nid, struct access_coordinate *coord,
enum access_coordinate_class access);
#else
static inline void node_add_cache(unsigned int nid,
struct node_cache_attrs *cache_attrs)
{
}
static inline void node_set_perf_attrs(unsigned int nid,
struct access_coordinate *coord,
enum access_coordinate_class access)
{
}
#endif
struct node {
struct device dev;
struct list_head access_list;
#ifdef CONFIG_HMEM_REPORTING
struct list_head cache_attrs;
struct device *cache_dev;
#endif
};
struct memory_block;
extern struct node *node_devices[];
#if defined (CONFIG_MEMORY_HOTPLUG) && defined (CONFIG_NUMA)
void register_memory_blocks_under_node_hotplug(int nid, unsigned long start_pfn,
unsigned long end_pfn);
#else
static inline void register_memory_blocks_under_node_hotplug(int nid,
unsigned long start_pfn,
unsigned long end_pfn)
{
}
static inline void register_memory_blocks_under_nodes(void )
{
}
#endif
extern void unregister_node(struct node *node);
struct node_notify {
int nid;
};
#define NODE_ADDING_FIRST_MEMORY (1 <<0 )
#define NODE_ADDED_FIRST_MEMORY (1 <<1 )
#define NODE_CANCEL_ADDING_FIRST_MEMORY (1 <<2 )
#define NODE_REMOVING_LAST_MEMORY (1 <<3 )
#define NODE_REMOVED_LAST_MEMORY (1 <<4 )
#define NODE_CANCEL_REMOVING_LAST_MEMORY (1 <<5 )
#if defined (CONFIG_MEMORY_HOTPLUG) && defined (CONFIG_NUMA)
extern int register_node_notifier(struct notifier_block *nb);
extern void unregister_node_notifier(struct notifier_block *nb);
extern int node_notify(unsigned long val, void *v);
#define hotplug_node_notifier(fn, pri) ({ \
static __meminitdata struct notifier_block fn## _node_nb =\
{ .notifier_call = fn, .priority = pri };\
register_node_notifier(&fn## _node_nb); \
})
#else
static inline int register_node_notifier(struct notifier_block *nb)
{
return 0 ;
}
static inline void unregister_node_notifier(struct notifier_block *nb)
{
}
static inline int node_notify(unsigned long val, void *v)
{
return 0 ;
}
static inline int hotplug_node_notifier(notifier_fn_t fn, int pri)
{
return 0 ;
}
#endif
#ifdef CONFIG_NUMA
extern void node_dev_init(void );
/* Core of the node registration - only memory hotplug should use this */
extern int register_one_node(int nid);
extern void unregister_one_node(int nid);
extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
extern void unregister_memory_block_under_nodes(struct memory_block *mem_blk);
extern int register_memory_node_under_compute_node(unsigned int mem_nid,
unsigned int cpu_nid,
enum access_coordinate_class access);
#else
static inline void node_dev_init(void )
{
}
static inline int register_one_node(int nid)
{
return 0 ;
}
static inline int unregister_one_node(int nid)
{
return 0 ;
}
static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
{
return 0 ;
}
static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
{
return 0 ;
}
static inline void unregister_memory_block_under_nodes(struct memory_block *mem_blk)
{
}
#endif
#define to_node(device) container_of(device, struct node, dev)
#endif /* _LINUX_NODE_H_ */
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