184 lines
4.6 KiB
C
184 lines
4.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* include/linux/node.h - generic node definition
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*
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* This is mainly for topological representation. We define the
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* basic 'struct node' here, which can be embedded in per-arch
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* definitions of processors.
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*
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* Basic handling of the devices is done in drivers/base/node.c
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* and system devices are handled in drivers/base/sys.c.
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*
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* Nodes are exported via driverfs in the class/node/devices/
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* directory.
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*/
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#ifndef _LINUX_NODE_H_
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#define _LINUX_NODE_H_
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#include <linux/device.h>
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#include <linux/cpumask.h>
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#include <linux/list.h>
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#include <linux/workqueue.h>
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/**
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* struct node_hmem_attrs - heterogeneous memory performance attributes
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*
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* @read_bandwidth: Read bandwidth in MB/s
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* @write_bandwidth: Write bandwidth in MB/s
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* @read_latency: Read latency in nanoseconds
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* @write_latency: Write latency in nanoseconds
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*/
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struct node_hmem_attrs {
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unsigned int read_bandwidth;
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unsigned int write_bandwidth;
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unsigned int read_latency;
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unsigned int write_latency;
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};
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enum cache_indexing {
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NODE_CACHE_DIRECT_MAP,
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NODE_CACHE_INDEXED,
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NODE_CACHE_OTHER,
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};
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enum cache_write_policy {
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NODE_CACHE_WRITE_BACK,
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NODE_CACHE_WRITE_THROUGH,
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NODE_CACHE_WRITE_OTHER,
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};
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/**
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* struct node_cache_attrs - system memory caching attributes
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*
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* @indexing: The ways memory blocks may be placed in cache
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* @write_policy: Write back or write through policy
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* @size: Total size of cache in bytes
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* @line_size: Number of bytes fetched on a cache miss
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* @level: The cache hierarchy level
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*/
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struct node_cache_attrs {
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enum cache_indexing indexing;
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enum cache_write_policy write_policy;
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u64 size;
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u16 line_size;
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u8 level;
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};
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#ifdef CONFIG_HMEM_REPORTING
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void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs);
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void node_set_perf_attrs(unsigned int nid, struct node_hmem_attrs *hmem_attrs,
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unsigned access);
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#else
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static inline void node_add_cache(unsigned int nid,
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struct node_cache_attrs *cache_attrs)
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{
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}
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static inline void node_set_perf_attrs(unsigned int nid,
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struct node_hmem_attrs *hmem_attrs,
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unsigned access)
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{
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}
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#endif
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struct node {
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struct device dev;
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struct list_head access_list;
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#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
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struct work_struct node_work;
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#endif
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#ifdef CONFIG_HMEM_REPORTING
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struct list_head cache_attrs;
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struct device *cache_dev;
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#endif
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};
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struct memory_block;
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extern struct node *node_devices[];
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typedef void (*node_registration_func_t)(struct node *);
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#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_NUMA)
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extern int link_mem_sections(int nid, unsigned long start_pfn,
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unsigned long end_pfn);
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#else
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static inline int link_mem_sections(int nid, unsigned long start_pfn,
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unsigned long end_pfn)
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{
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return 0;
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}
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#endif
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extern void unregister_node(struct node *node);
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#ifdef CONFIG_NUMA
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/* Core of the node registration - only memory hotplug should use this */
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extern int __register_one_node(int nid);
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/* Registers an online node */
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static inline int register_one_node(int nid)
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{
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int error = 0;
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if (node_online(nid)) {
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struct pglist_data *pgdat = NODE_DATA(nid);
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unsigned long start_pfn = pgdat->node_start_pfn;
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unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages;
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error = __register_one_node(nid);
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if (error)
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return error;
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/* link memory sections under this node */
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error = link_mem_sections(nid, start_pfn, end_pfn);
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}
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return error;
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}
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extern void unregister_one_node(int nid);
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extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
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extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
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extern void unregister_memory_block_under_nodes(struct memory_block *mem_blk);
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extern int register_memory_node_under_compute_node(unsigned int mem_nid,
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unsigned int cpu_nid,
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unsigned access);
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#ifdef CONFIG_HUGETLBFS
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extern void register_hugetlbfs_with_node(node_registration_func_t doregister,
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node_registration_func_t unregister);
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#endif
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#else
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static inline int __register_one_node(int nid)
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{
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return 0;
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}
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static inline int register_one_node(int nid)
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{
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return 0;
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}
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static inline int unregister_one_node(int nid)
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{
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return 0;
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}
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static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
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{
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return 0;
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}
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static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
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{
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return 0;
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}
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static inline void unregister_memory_block_under_nodes(struct memory_block *mem_blk)
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{
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}
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static inline void register_hugetlbfs_with_node(node_registration_func_t reg,
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node_registration_func_t unreg)
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{
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}
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#endif
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#define to_node(device) container_of(device, struct node, dev)
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#endif /* _LINUX_NODE_H_ */
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