Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __LINUX_MEMORY_HOTPLUG_H
3#define __LINUX_MEMORY_HOTPLUG_H
4
5#include <linux/mmzone.h>
6#include <linux/spinlock.h>
7#include <linux/notifier.h>
8#include <linux/bug.h>
9
10struct page;
11struct zone;
12struct pglist_data;
13struct mem_section;
14struct memory_block;
15struct resource;
16struct vmem_altmap;
17
18#ifdef CONFIG_MEMORY_HOTPLUG
19/*
20 * Return page for the valid pfn only if the page is online. All pfn
21 * walkers which rely on the fully initialized page->flags and others
22 * should use this rather than pfn_valid && pfn_to_page
23 */
24#define pfn_to_online_page(pfn) \
25({ \
26 struct page *___page = NULL; \
27 unsigned long ___nr = pfn_to_section_nr(pfn); \
28 \
29 if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr))\
30 ___page = pfn_to_page(pfn); \
31 ___page; \
32})
33
34/*
35 * Types for free bootmem stored in page->lru.next. These have to be in
36 * some random range in unsigned long space for debugging purposes.
37 */
38enum {
39 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
40 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
41 MIX_SECTION_INFO,
42 NODE_INFO,
43 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
44};
45
46/* Types for control the zone type of onlined and offlined memory */
47enum {
48 MMOP_OFFLINE = -1,
49 MMOP_ONLINE_KEEP,
50 MMOP_ONLINE_KERNEL,
51 MMOP_ONLINE_MOVABLE,
52};
53
54/*
55 * Zone resizing functions
56 *
57 * Note: any attempt to resize a zone should has pgdat_resize_lock()
58 * zone_span_writelock() both held. This ensure the size of a zone
59 * can't be changed while pgdat_resize_lock() held.
60 */
61static inline unsigned zone_span_seqbegin(struct zone *zone)
62{
63 return read_seqbegin(&zone->span_seqlock);
64}
65static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
66{
67 return read_seqretry(&zone->span_seqlock, iv);
68}
69static inline void zone_span_writelock(struct zone *zone)
70{
71 write_seqlock(&zone->span_seqlock);
72}
73static inline void zone_span_writeunlock(struct zone *zone)
74{
75 write_sequnlock(&zone->span_seqlock);
76}
77static inline void zone_seqlock_init(struct zone *zone)
78{
79 seqlock_init(&zone->span_seqlock);
80}
81extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
82extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
83extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
84/* VM interface that may be used by firmware interface */
85extern int online_pages(unsigned long, unsigned long, int);
86extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
87 unsigned long *valid_start, unsigned long *valid_end);
88extern void __offline_isolated_pages(unsigned long, unsigned long);
89
90typedef void (*online_page_callback_t)(struct page *page);
91
92extern int set_online_page_callback(online_page_callback_t callback);
93extern int restore_online_page_callback(online_page_callback_t callback);
94
95extern void __online_page_set_limits(struct page *page);
96extern void __online_page_increment_counters(struct page *page);
97extern void __online_page_free(struct page *page);
98
99extern int try_online_node(int nid);
100
101extern bool memhp_auto_online;
102/* If movable_node boot option specified */
103extern bool movable_node_enabled;
104static inline bool movable_node_is_enabled(void)
105{
106 return movable_node_enabled;
107}
108
109#ifdef CONFIG_MEMORY_HOTREMOVE
110extern bool is_pageblock_removable_nolock(struct page *page);
111extern int arch_remove_memory(u64 start, u64 size,
112 struct vmem_altmap *altmap);
113extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
114 unsigned long nr_pages, struct vmem_altmap *altmap);
115#endif /* CONFIG_MEMORY_HOTREMOVE */
116
117/* reasonably generic interface to expand the physical pages */
118extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
119 struct vmem_altmap *altmap, bool want_memblock);
120
121#ifndef CONFIG_ARCH_HAS_ADD_PAGES
122static inline int add_pages(int nid, unsigned long start_pfn,
123 unsigned long nr_pages, struct vmem_altmap *altmap,
124 bool want_memblock)
125{
126 return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
127}
128#else /* ARCH_HAS_ADD_PAGES */
129int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
130 struct vmem_altmap *altmap, bool want_memblock);
131#endif /* ARCH_HAS_ADD_PAGES */
132
133#ifdef CONFIG_NUMA
134extern int memory_add_physaddr_to_nid(u64 start);
135#else
136static inline int memory_add_physaddr_to_nid(u64 start)
137{
138 return 0;
139}
140#endif
141
142#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
143/*
144 * For supporting node-hotadd, we have to allocate a new pgdat.
145 *
146 * If an arch has generic style NODE_DATA(),
147 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
148 *
149 * In general, generic_alloc_nodedata() is used.
150 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
151 *
152 */
153extern pg_data_t *arch_alloc_nodedata(int nid);
154extern void arch_free_nodedata(pg_data_t *pgdat);
155extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
156
157#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
158
159#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
160#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
161
162#ifdef CONFIG_NUMA
163/*
164 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
165 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
166 * Because, pgdat for the new node is not allocated/initialized yet itself.
167 * To use new node's memory, more consideration will be necessary.
168 */
169#define generic_alloc_nodedata(nid) \
170({ \
171 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
172})
173/*
174 * This definition is just for error path in node hotadd.
175 * For node hotremove, we have to replace this.
176 */
177#define generic_free_nodedata(pgdat) kfree(pgdat)
178
179extern pg_data_t *node_data[];
180static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
181{
182 node_data[nid] = pgdat;
183}
184
185#else /* !CONFIG_NUMA */
186
187/* never called */
188static inline pg_data_t *generic_alloc_nodedata(int nid)
189{
190 BUG();
191 return NULL;
192}
193static inline void generic_free_nodedata(pg_data_t *pgdat)
194{
195}
196static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
197{
198}
199#endif /* CONFIG_NUMA */
200#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
201
202#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
203extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
204#else
205static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
206{
207}
208#endif
209extern void put_page_bootmem(struct page *page);
210extern void get_page_bootmem(unsigned long ingo, struct page *page,
211 unsigned long type);
212
213void get_online_mems(void);
214void put_online_mems(void);
215
216void mem_hotplug_begin(void);
217void mem_hotplug_done(void);
218
219#else /* ! CONFIG_MEMORY_HOTPLUG */
220#define pfn_to_online_page(pfn) \
221({ \
222 struct page *___page = NULL; \
223 if (pfn_valid(pfn)) \
224 ___page = pfn_to_page(pfn); \
225 ___page; \
226 })
227
228static inline unsigned zone_span_seqbegin(struct zone *zone)
229{
230 return 0;
231}
232static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
233{
234 return 0;
235}
236static inline void zone_span_writelock(struct zone *zone) {}
237static inline void zone_span_writeunlock(struct zone *zone) {}
238static inline void zone_seqlock_init(struct zone *zone) {}
239
240static inline int mhp_notimplemented(const char *func)
241{
242 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
243 dump_stack();
244 return -ENOSYS;
245}
246
247static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
248{
249}
250
251static inline int try_online_node(int nid)
252{
253 return 0;
254}
255
256static inline void get_online_mems(void) {}
257static inline void put_online_mems(void) {}
258
259static inline void mem_hotplug_begin(void) {}
260static inline void mem_hotplug_done(void) {}
261
262static inline bool movable_node_is_enabled(void)
263{
264 return false;
265}
266#endif /* ! CONFIG_MEMORY_HOTPLUG */
267
268#if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
269/*
270 * pgdat resizing functions
271 */
272static inline
273void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
274{
275 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
276}
277static inline
278void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
279{
280 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
281}
282static inline
283void pgdat_resize_init(struct pglist_data *pgdat)
284{
285 spin_lock_init(&pgdat->node_size_lock);
286}
287#else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
288/*
289 * Stub functions for when hotplug is off
290 */
291static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
292static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
293static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
294#endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
295
296#ifdef CONFIG_MEMORY_HOTREMOVE
297
298extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
299extern void try_offline_node(int nid);
300extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
301extern void remove_memory(int nid, u64 start, u64 size);
302
303#else
304static inline bool is_mem_section_removable(unsigned long pfn,
305 unsigned long nr_pages)
306{
307 return false;
308}
309
310static inline void try_offline_node(int nid) {}
311
312static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
313{
314 return -EINVAL;
315}
316
317static inline void remove_memory(int nid, u64 start, u64 size) {}
318#endif /* CONFIG_MEMORY_HOTREMOVE */
319
320extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
321 void *arg, int (*func)(struct memory_block *, void *));
322extern int add_memory(int nid, u64 start, u64 size);
323extern int add_memory_resource(int nid, struct resource *resource, bool online);
324extern int arch_add_memory(int nid, u64 start, u64 size,
325 struct vmem_altmap *altmap, bool want_memblock);
326extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
327 unsigned long nr_pages, struct vmem_altmap *altmap);
328extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
329extern bool is_memblock_offlined(struct memory_block *mem);
330extern void remove_memory(int nid, u64 start, u64 size);
331extern int sparse_add_one_section(struct pglist_data *pgdat,
332 unsigned long start_pfn, struct vmem_altmap *altmap);
333extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
334 unsigned long map_offset, struct vmem_altmap *altmap);
335extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
336 unsigned long pnum);
337extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
338 int online_type);
339extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
340 unsigned long nr_pages);
341#endif /* __LINUX_MEMORY_HOTPLUG_H */