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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/list.h>
20
21/**
22 * struct access_coordinate - generic performance coordinates container
23 *
24 * @read_bandwidth: Read bandwidth in MB/s
25 * @write_bandwidth: Write bandwidth in MB/s
26 * @read_latency: Read latency in nanoseconds
27 * @write_latency: Write latency in nanoseconds
28 */
29struct access_coordinate {
30 unsigned int read_bandwidth;
31 unsigned int write_bandwidth;
32 unsigned int read_latency;
33 unsigned int write_latency;
34};
35
36/*
37 * ACCESS_COORDINATE_LOCAL correlates to ACCESS CLASS 0
38 * - access_coordinate between target node and nearest initiator node
39 * ACCESS_COORDINATE_CPU correlates to ACCESS CLASS 1
40 * - access_coordinate between target node and nearest CPU node
41 */
42enum access_coordinate_class {
43 ACCESS_COORDINATE_LOCAL,
44 ACCESS_COORDINATE_CPU,
45 ACCESS_COORDINATE_MAX
46};
47
48enum cache_indexing {
49 NODE_CACHE_DIRECT_MAP,
50 NODE_CACHE_INDEXED,
51 NODE_CACHE_OTHER,
52};
53
54enum cache_write_policy {
55 NODE_CACHE_WRITE_BACK,
56 NODE_CACHE_WRITE_THROUGH,
57 NODE_CACHE_WRITE_OTHER,
58};
59
60enum cache_mode {
61 NODE_CACHE_ADDR_MODE_RESERVED,
62 NODE_CACHE_ADDR_MODE_EXTENDED_LINEAR,
63};
64
65/**
66 * struct node_cache_attrs - system memory caching attributes
67 *
68 * @indexing: The ways memory blocks may be placed in cache
69 * @write_policy: Write back or write through policy
70 * @size: Total size of cache in bytes
71 * @line_size: Number of bytes fetched on a cache miss
72 * @level: The cache hierarchy level
73 * @address_mode: The address mode
74 */
75struct node_cache_attrs {
76 enum cache_indexing indexing;
77 enum cache_write_policy write_policy;
78 u64 size;
79 u16 line_size;
80 u8 level;
81 u16 address_mode;
82};
83
84#ifdef CONFIG_HMEM_REPORTING
85void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs);
86void node_set_perf_attrs(unsigned int nid, struct access_coordinate *coord,
87 enum access_coordinate_class access);
88#else
89static inline void node_add_cache(unsigned int nid,
90 struct node_cache_attrs *cache_attrs)
91{
92}
93
94static inline void node_set_perf_attrs(unsigned int nid,
95 struct access_coordinate *coord,
96 enum access_coordinate_class access)
97{
98}
99#endif
100
101struct node {
102 struct device dev;
103 struct list_head access_list;
104#ifdef CONFIG_HMEM_REPORTING
105 struct list_head cache_attrs;
106 struct device *cache_dev;
107#endif
108};
109
110struct memory_block;
111extern struct node *node_devices[];
112
113#if defined(CONFIG_MEMORY_HOTPLUG) && defined(CONFIG_NUMA)
114void register_memory_blocks_under_node_hotplug(int nid, unsigned long start_pfn,
115 unsigned long end_pfn);
116#else
117static inline void register_memory_blocks_under_node_hotplug(int nid,
118 unsigned long start_pfn,
119 unsigned long end_pfn)
120{
121}
122static inline void register_memory_blocks_under_nodes(void)
123{
124}
125#endif
126
127extern void unregister_node(struct node *node);
128
129struct node_notify {
130 int nid;
131};
132
133#define NODE_ADDING_FIRST_MEMORY (1<<0)
134#define NODE_ADDED_FIRST_MEMORY (1<<1)
135#define NODE_CANCEL_ADDING_FIRST_MEMORY (1<<2)
136#define NODE_REMOVING_LAST_MEMORY (1<<3)
137#define NODE_REMOVED_LAST_MEMORY (1<<4)
138#define NODE_CANCEL_REMOVING_LAST_MEMORY (1<<5)
139
140#if defined(CONFIG_MEMORY_HOTPLUG) && defined(CONFIG_NUMA)
141extern int register_node_notifier(struct notifier_block *nb);
142extern void unregister_node_notifier(struct notifier_block *nb);
143extern int node_notify(unsigned long val, void *v);
144
145#define hotplug_node_notifier(fn, pri) ({ \
146 static __meminitdata struct notifier_block fn##_node_nb =\
147 { .notifier_call = fn, .priority = pri };\
148 register_node_notifier(&fn##_node_nb); \
149})
150#else
151static inline int register_node_notifier(struct notifier_block *nb)
152{
153 return 0;
154}
155static inline void unregister_node_notifier(struct notifier_block *nb)
156{
157}
158static inline int node_notify(unsigned long val, void *v)
159{
160 return 0;
161}
162static inline int hotplug_node_notifier(notifier_fn_t fn, int pri)
163{
164 return 0;
165}
166#endif
167
168#ifdef CONFIG_NUMA
169extern void node_dev_init(void);
170/* Core of the node registration - only memory hotplug should use this */
171extern int register_one_node(int nid);
172extern void unregister_one_node(int nid);
173extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
174extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
175extern void unregister_memory_block_under_nodes(struct memory_block *mem_blk);
176
177extern int register_memory_node_under_compute_node(unsigned int mem_nid,
178 unsigned int cpu_nid,
179 enum access_coordinate_class access);
180#else
181static inline void node_dev_init(void)
182{
183}
184static inline int register_one_node(int nid)
185{
186 return 0;
187}
188static inline int unregister_one_node(int nid)
189{
190 return 0;
191}
192static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
193{
194 return 0;
195}
196static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
197{
198 return 0;
199}
200static inline void unregister_memory_block_under_nodes(struct memory_block *mem_blk)
201{
202}
203#endif
204
205#define to_node(device) container_of(device, struct node, dev)
206
207#endif /* _LINUX_NODE_H_ */