node.h (4951B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * include/linux/node.h - generic node definition 4 * 5 * This is mainly for topological representation. We define the 6 * basic 'struct node' here, which can be embedded in per-arch 7 * definitions of processors. 8 * 9 * Basic handling of the devices is done in drivers/base/node.c 10 * and system devices are handled in drivers/base/sys.c. 11 * 12 * Nodes are exported via driverfs in the class/node/devices/ 13 * directory. 14 */ 15#ifndef _LINUX_NODE_H_ 16#define _LINUX_NODE_H_ 17 18#include <linux/device.h> 19#include <linux/cpumask.h> 20#include <linux/list.h> 21#include <linux/workqueue.h> 22 23/** 24 * struct node_hmem_attrs - heterogeneous memory performance attributes 25 * 26 * @read_bandwidth: Read bandwidth in MB/s 27 * @write_bandwidth: Write bandwidth in MB/s 28 * @read_latency: Read latency in nanoseconds 29 * @write_latency: Write latency in nanoseconds 30 */ 31struct node_hmem_attrs { 32 unsigned int read_bandwidth; 33 unsigned int write_bandwidth; 34 unsigned int read_latency; 35 unsigned int write_latency; 36}; 37 38enum cache_indexing { 39 NODE_CACHE_DIRECT_MAP, 40 NODE_CACHE_INDEXED, 41 NODE_CACHE_OTHER, 42}; 43 44enum cache_write_policy { 45 NODE_CACHE_WRITE_BACK, 46 NODE_CACHE_WRITE_THROUGH, 47 NODE_CACHE_WRITE_OTHER, 48}; 49 50/** 51 * struct node_cache_attrs - system memory caching attributes 52 * 53 * @indexing: The ways memory blocks may be placed in cache 54 * @write_policy: Write back or write through policy 55 * @size: Total size of cache in bytes 56 * @line_size: Number of bytes fetched on a cache miss 57 * @level: The cache hierarchy level 58 */ 59struct node_cache_attrs { 60 enum cache_indexing indexing; 61 enum cache_write_policy write_policy; 62 u64 size; 63 u16 line_size; 64 u8 level; 65}; 66 67#ifdef CONFIG_HMEM_REPORTING 68void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs); 69void node_set_perf_attrs(unsigned int nid, struct node_hmem_attrs *hmem_attrs, 70 unsigned access); 71#else 72static inline void node_add_cache(unsigned int nid, 73 struct node_cache_attrs *cache_attrs) 74{ 75} 76 77static inline void node_set_perf_attrs(unsigned int nid, 78 struct node_hmem_attrs *hmem_attrs, 79 unsigned access) 80{ 81} 82#endif 83 84struct node { 85 struct device dev; 86 struct list_head access_list; 87 88#if defined(CONFIG_MEMORY_HOTPLUG) && defined(CONFIG_HUGETLBFS) 89 struct work_struct node_work; 90#endif 91#ifdef CONFIG_HMEM_REPORTING 92 struct list_head cache_attrs; 93 struct device *cache_dev; 94#endif 95}; 96 97struct memory_block; 98extern struct node *node_devices[]; 99typedef void (*node_registration_func_t)(struct node *); 100 101#if defined(CONFIG_MEMORY_HOTPLUG) && defined(CONFIG_NUMA) 102void register_memory_blocks_under_node(int nid, unsigned long start_pfn, 103 unsigned long end_pfn, 104 enum meminit_context context); 105#else 106static inline void register_memory_blocks_under_node(int nid, unsigned long start_pfn, 107 unsigned long end_pfn, 108 enum meminit_context context) 109{ 110} 111#endif 112 113extern void unregister_node(struct node *node); 114#ifdef CONFIG_NUMA 115extern void node_dev_init(void); 116/* Core of the node registration - only memory hotplug should use this */ 117extern int __register_one_node(int nid); 118 119/* Registers an online node */ 120static inline int register_one_node(int nid) 121{ 122 int error = 0; 123 124 if (node_online(nid)) { 125 struct pglist_data *pgdat = NODE_DATA(nid); 126 unsigned long start_pfn = pgdat->node_start_pfn; 127 unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages; 128 129 error = __register_one_node(nid); 130 if (error) 131 return error; 132 register_memory_blocks_under_node(nid, start_pfn, end_pfn, 133 MEMINIT_EARLY); 134 } 135 136 return error; 137} 138 139extern void unregister_one_node(int nid); 140extern int register_cpu_under_node(unsigned int cpu, unsigned int nid); 141extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid); 142extern void unregister_memory_block_under_nodes(struct memory_block *mem_blk); 143 144extern int register_memory_node_under_compute_node(unsigned int mem_nid, 145 unsigned int cpu_nid, 146 unsigned access); 147 148#ifdef CONFIG_HUGETLBFS 149extern void register_hugetlbfs_with_node(node_registration_func_t doregister, 150 node_registration_func_t unregister); 151#endif 152#else 153static inline void node_dev_init(void) 154{ 155} 156static inline int __register_one_node(int nid) 157{ 158 return 0; 159} 160static inline int register_one_node(int nid) 161{ 162 return 0; 163} 164static inline int unregister_one_node(int nid) 165{ 166 return 0; 167} 168static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid) 169{ 170 return 0; 171} 172static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) 173{ 174 return 0; 175} 176static inline void unregister_memory_block_under_nodes(struct memory_block *mem_blk) 177{ 178} 179 180static inline void register_hugetlbfs_with_node(node_registration_func_t reg, 181 node_registration_func_t unreg) 182{ 183} 184#endif 185 186#define to_node(device) container_of(device, struct node, dev) 187 188static inline bool node_is_toptier(int node) 189{ 190 return node_state(node, N_CPU); 191} 192 193#endif /* _LINUX_NODE_H_ */