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 ___pfn = pfn; \
28 unsigned long ___nr = pfn_to_section_nr(___pfn); \
29 \
30 if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr) && \
31 pfn_valid_within(___pfn)) \
32 ___page = pfn_to_page(___pfn); \
33 ___page; \
34})
35
36/*
37 * Types for free bootmem stored in page->lru.next. These have to be in
38 * some random range in unsigned long space for debugging purposes.
39 */
40enum {
41 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
42 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
43 MIX_SECTION_INFO,
44 NODE_INFO,
45 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
46};
47
48/* Types for control the zone type of onlined and offlined memory */
49enum {
50 MMOP_OFFLINE = -1,
51 MMOP_ONLINE_KEEP,
52 MMOP_ONLINE_KERNEL,
53 MMOP_ONLINE_MOVABLE,
54};
55
56/*
57 * Zone resizing functions
58 *
59 * Note: any attempt to resize a zone should has pgdat_resize_lock()
60 * zone_span_writelock() both held. This ensure the size of a zone
61 * can't be changed while pgdat_resize_lock() held.
62 */
63static inline unsigned zone_span_seqbegin(struct zone *zone)
64{
65 return read_seqbegin(&zone->span_seqlock);
66}
67static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
68{
69 return read_seqretry(&zone->span_seqlock, iv);
70}
71static inline void zone_span_writelock(struct zone *zone)
72{
73 write_seqlock(&zone->span_seqlock);
74}
75static inline void zone_span_writeunlock(struct zone *zone)
76{
77 write_sequnlock(&zone->span_seqlock);
78}
79static inline void zone_seqlock_init(struct zone *zone)
80{
81 seqlock_init(&zone->span_seqlock);
82}
83extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
84extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
85extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
86/* VM interface that may be used by firmware interface */
87extern int online_pages(unsigned long, unsigned long, int);
88extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
89 unsigned long *valid_start, unsigned long *valid_end);
90extern void __offline_isolated_pages(unsigned long, unsigned long);
91
92typedef void (*online_page_callback_t)(struct page *page);
93
94extern int set_online_page_callback(online_page_callback_t callback);
95extern int restore_online_page_callback(online_page_callback_t callback);
96
97extern void __online_page_set_limits(struct page *page);
98extern void __online_page_increment_counters(struct page *page);
99extern void __online_page_free(struct page *page);
100
101extern int try_online_node(int nid);
102
103extern bool memhp_auto_online;
104/* If movable_node boot option specified */
105extern bool movable_node_enabled;
106static inline bool movable_node_is_enabled(void)
107{
108 return movable_node_enabled;
109}
110
111#ifdef CONFIG_MEMORY_HOTREMOVE
112extern int arch_remove_memory(int nid, u64 start, u64 size,
113 struct vmem_altmap *altmap);
114extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
115 unsigned long nr_pages, struct vmem_altmap *altmap);
116#endif /* CONFIG_MEMORY_HOTREMOVE */
117
118/* reasonably generic interface to expand the physical pages */
119extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
120 struct vmem_altmap *altmap, bool want_memblock);
121
122#ifndef CONFIG_ARCH_HAS_ADD_PAGES
123static inline int add_pages(int nid, unsigned long start_pfn,
124 unsigned long nr_pages, struct vmem_altmap *altmap,
125 bool want_memblock)
126{
127 return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
128}
129#else /* ARCH_HAS_ADD_PAGES */
130int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
131 struct vmem_altmap *altmap, bool want_memblock);
132#endif /* ARCH_HAS_ADD_PAGES */
133
134#ifdef CONFIG_NUMA
135extern int memory_add_physaddr_to_nid(u64 start);
136#else
137static inline int memory_add_physaddr_to_nid(u64 start)
138{
139 return 0;
140}
141#endif
142
143#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
144/*
145 * For supporting node-hotadd, we have to allocate a new pgdat.
146 *
147 * If an arch has generic style NODE_DATA(),
148 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
149 *
150 * In general, generic_alloc_nodedata() is used.
151 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
152 *
153 */
154extern pg_data_t *arch_alloc_nodedata(int nid);
155extern void arch_free_nodedata(pg_data_t *pgdat);
156extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
157
158#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
159
160#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
161#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
162
163#ifdef CONFIG_NUMA
164/*
165 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
166 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
167 * Because, pgdat for the new node is not allocated/initialized yet itself.
168 * To use new node's memory, more consideration will be necessary.
169 */
170#define generic_alloc_nodedata(nid) \
171({ \
172 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
173})
174/*
175 * This definition is just for error path in node hotadd.
176 * For node hotremove, we have to replace this.
177 */
178#define generic_free_nodedata(pgdat) kfree(pgdat)
179
180extern pg_data_t *node_data[];
181static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
182{
183 node_data[nid] = pgdat;
184}
185
186#else /* !CONFIG_NUMA */
187
188/* never called */
189static inline pg_data_t *generic_alloc_nodedata(int nid)
190{
191 BUG();
192 return NULL;
193}
194static inline void generic_free_nodedata(pg_data_t *pgdat)
195{
196}
197static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
198{
199}
200#endif /* CONFIG_NUMA */
201#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
202
203#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
204extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
205#else
206static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
207{
208}
209#endif
210extern void put_page_bootmem(struct page *page);
211extern void get_page_bootmem(unsigned long ingo, struct page *page,
212 unsigned long type);
213
214void get_online_mems(void);
215void put_online_mems(void);
216
217void mem_hotplug_begin(void);
218void mem_hotplug_done(void);
219
220extern void set_zone_contiguous(struct zone *zone);
221extern void clear_zone_contiguous(struct zone *zone);
222
223#else /* ! CONFIG_MEMORY_HOTPLUG */
224#define pfn_to_online_page(pfn) \
225({ \
226 struct page *___page = NULL; \
227 if (pfn_valid(pfn)) \
228 ___page = pfn_to_page(pfn); \
229 ___page; \
230 })
231
232static inline unsigned zone_span_seqbegin(struct zone *zone)
233{
234 return 0;
235}
236static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
237{
238 return 0;
239}
240static inline void zone_span_writelock(struct zone *zone) {}
241static inline void zone_span_writeunlock(struct zone *zone) {}
242static inline void zone_seqlock_init(struct zone *zone) {}
243
244static inline int mhp_notimplemented(const char *func)
245{
246 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
247 dump_stack();
248 return -ENOSYS;
249}
250
251static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
252{
253}
254
255static inline int try_online_node(int nid)
256{
257 return 0;
258}
259
260static inline void get_online_mems(void) {}
261static inline void put_online_mems(void) {}
262
263static inline void mem_hotplug_begin(void) {}
264static inline void mem_hotplug_done(void) {}
265
266static inline bool movable_node_is_enabled(void)
267{
268 return false;
269}
270#endif /* ! CONFIG_MEMORY_HOTPLUG */
271
272#if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
273/*
274 * pgdat resizing functions
275 */
276static inline
277void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
278{
279 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
280}
281static inline
282void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
283{
284 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
285}
286static inline
287void pgdat_resize_init(struct pglist_data *pgdat)
288{
289 spin_lock_init(&pgdat->node_size_lock);
290}
291#else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
292/*
293 * Stub functions for when hotplug is off
294 */
295static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
296static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
297static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
298#endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
299
300#ifdef CONFIG_MEMORY_HOTREMOVE
301
302extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
303extern void try_offline_node(int nid);
304extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
305extern void remove_memory(int nid, u64 start, u64 size);
306extern void __remove_memory(int nid, u64 start, u64 size);
307
308#else
309static inline bool is_mem_section_removable(unsigned long pfn,
310 unsigned long nr_pages)
311{
312 return false;
313}
314
315static inline void try_offline_node(int nid) {}
316
317static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
318{
319 return -EINVAL;
320}
321
322static inline void remove_memory(int nid, u64 start, u64 size) {}
323static inline void __remove_memory(int nid, u64 start, u64 size) {}
324#endif /* CONFIG_MEMORY_HOTREMOVE */
325
326extern void __ref free_area_init_core_hotplug(int nid);
327extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
328 void *arg, int (*func)(struct memory_block *, void *));
329extern int __add_memory(int nid, u64 start, u64 size);
330extern int add_memory(int nid, u64 start, u64 size);
331extern int add_memory_resource(int nid, struct resource *resource);
332extern int arch_add_memory(int nid, u64 start, u64 size,
333 struct vmem_altmap *altmap, bool want_memblock);
334extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
335 unsigned long nr_pages, struct vmem_altmap *altmap);
336extern bool is_memblock_offlined(struct memory_block *mem);
337extern int sparse_add_one_section(int nid, unsigned long start_pfn,
338 struct vmem_altmap *altmap);
339extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
340 unsigned long map_offset, struct vmem_altmap *altmap);
341extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
342 unsigned long pnum);
343extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
344 int online_type);
345extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
346 unsigned long nr_pages);
347#endif /* __LINUX_MEMORY_HOTPLUG_H */