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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 /* Offline the memory. */
51 MMOP_OFFLINE = 0,
52 /* Online the memory. Zone depends, see default_zone_for_pfn(). */
53 MMOP_ONLINE,
54 /* Online the memory to ZONE_NORMAL. */
55 MMOP_ONLINE_KERNEL,
56 /* Online the memory to ZONE_MOVABLE. */
57 MMOP_ONLINE_MOVABLE,
58};
59
60/*
61 * Extended parameters for memory hotplug:
62 * altmap: alternative allocator for memmap array (optional)
63 * pgprot: page protection flags to apply to newly created page tables
64 * (required)
65 */
66struct mhp_params {
67 struct vmem_altmap *altmap;
68 pgprot_t pgprot;
69};
70
71/*
72 * Zone resizing functions
73 *
74 * Note: any attempt to resize a zone should has pgdat_resize_lock()
75 * zone_span_writelock() both held. This ensure the size of a zone
76 * can't be changed while pgdat_resize_lock() held.
77 */
78static inline unsigned zone_span_seqbegin(struct zone *zone)
79{
80 return read_seqbegin(&zone->span_seqlock);
81}
82static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
83{
84 return read_seqretry(&zone->span_seqlock, iv);
85}
86static inline void zone_span_writelock(struct zone *zone)
87{
88 write_seqlock(&zone->span_seqlock);
89}
90static inline void zone_span_writeunlock(struct zone *zone)
91{
92 write_sequnlock(&zone->span_seqlock);
93}
94static inline void zone_seqlock_init(struct zone *zone)
95{
96 seqlock_init(&zone->span_seqlock);
97}
98extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
99extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
100extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
101/* VM interface that may be used by firmware interface */
102extern int online_pages(unsigned long pfn, unsigned long nr_pages,
103 int online_type, int nid);
104extern struct zone *test_pages_in_a_zone(unsigned long start_pfn,
105 unsigned long end_pfn);
106extern unsigned long __offline_isolated_pages(unsigned long start_pfn,
107 unsigned long end_pfn);
108
109typedef void (*online_page_callback_t)(struct page *page, unsigned int order);
110
111extern void generic_online_page(struct page *page, unsigned int order);
112extern int set_online_page_callback(online_page_callback_t callback);
113extern int restore_online_page_callback(online_page_callback_t callback);
114
115extern int try_online_node(int nid);
116
117extern int arch_add_memory(int nid, u64 start, u64 size,
118 struct mhp_params *params);
119extern u64 max_mem_size;
120
121extern int memhp_online_type_from_str(const char *str);
122
123/* Default online_type (MMOP_*) when new memory blocks are added. */
124extern int memhp_default_online_type;
125/* If movable_node boot option specified */
126extern bool movable_node_enabled;
127static inline bool movable_node_is_enabled(void)
128{
129 return movable_node_enabled;
130}
131
132extern void arch_remove_memory(int nid, u64 start, u64 size,
133 struct vmem_altmap *altmap);
134extern void __remove_pages(unsigned long start_pfn, unsigned long nr_pages,
135 struct vmem_altmap *altmap);
136
137/* reasonably generic interface to expand the physical pages */
138extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
139 struct mhp_params *params);
140
141#ifndef CONFIG_ARCH_HAS_ADD_PAGES
142static inline int add_pages(int nid, unsigned long start_pfn,
143 unsigned long nr_pages, struct mhp_params *params)
144{
145 return __add_pages(nid, start_pfn, nr_pages, params);
146}
147#else /* ARCH_HAS_ADD_PAGES */
148int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
149 struct mhp_params *params);
150#endif /* ARCH_HAS_ADD_PAGES */
151
152#ifdef CONFIG_NUMA
153extern int memory_add_physaddr_to_nid(u64 start);
154#else
155static inline int memory_add_physaddr_to_nid(u64 start)
156{
157 return 0;
158}
159#endif
160
161#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
162/*
163 * For supporting node-hotadd, we have to allocate a new pgdat.
164 *
165 * If an arch has generic style NODE_DATA(),
166 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
167 *
168 * In general, generic_alloc_nodedata() is used.
169 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
170 *
171 */
172extern pg_data_t *arch_alloc_nodedata(int nid);
173extern void arch_free_nodedata(pg_data_t *pgdat);
174extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
175
176#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
177
178#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
179#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
180
181#ifdef CONFIG_NUMA
182/*
183 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
184 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
185 * Because, pgdat for the new node is not allocated/initialized yet itself.
186 * To use new node's memory, more consideration will be necessary.
187 */
188#define generic_alloc_nodedata(nid) \
189({ \
190 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
191})
192/*
193 * This definition is just for error path in node hotadd.
194 * For node hotremove, we have to replace this.
195 */
196#define generic_free_nodedata(pgdat) kfree(pgdat)
197
198extern pg_data_t *node_data[];
199static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
200{
201 node_data[nid] = pgdat;
202}
203
204#else /* !CONFIG_NUMA */
205
206/* never called */
207static inline pg_data_t *generic_alloc_nodedata(int nid)
208{
209 BUG();
210 return NULL;
211}
212static inline void generic_free_nodedata(pg_data_t *pgdat)
213{
214}
215static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
216{
217}
218#endif /* CONFIG_NUMA */
219#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
220
221#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
222extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
223#else
224static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
225{
226}
227#endif
228extern void put_page_bootmem(struct page *page);
229extern void get_page_bootmem(unsigned long ingo, struct page *page,
230 unsigned long type);
231
232void get_online_mems(void);
233void put_online_mems(void);
234
235void mem_hotplug_begin(void);
236void mem_hotplug_done(void);
237
238#else /* ! CONFIG_MEMORY_HOTPLUG */
239#define pfn_to_online_page(pfn) \
240({ \
241 struct page *___page = NULL; \
242 if (pfn_valid(pfn)) \
243 ___page = pfn_to_page(pfn); \
244 ___page; \
245 })
246
247static inline unsigned zone_span_seqbegin(struct zone *zone)
248{
249 return 0;
250}
251static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
252{
253 return 0;
254}
255static inline void zone_span_writelock(struct zone *zone) {}
256static inline void zone_span_writeunlock(struct zone *zone) {}
257static inline void zone_seqlock_init(struct zone *zone) {}
258
259static inline int mhp_notimplemented(const char *func)
260{
261 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
262 dump_stack();
263 return -ENOSYS;
264}
265
266static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
267{
268}
269
270static inline int try_online_node(int nid)
271{
272 return 0;
273}
274
275static inline void get_online_mems(void) {}
276static inline void put_online_mems(void) {}
277
278static inline void mem_hotplug_begin(void) {}
279static inline void mem_hotplug_done(void) {}
280
281static inline bool movable_node_is_enabled(void)
282{
283 return false;
284}
285#endif /* ! CONFIG_MEMORY_HOTPLUG */
286
287#if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
288/*
289 * pgdat resizing functions
290 */
291static inline
292void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
293{
294 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
295}
296static inline
297void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
298{
299 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
300}
301static inline
302void pgdat_resize_init(struct pglist_data *pgdat)
303{
304 spin_lock_init(&pgdat->node_size_lock);
305}
306#else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
307/*
308 * Stub functions for when hotplug is off
309 */
310static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
311static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
312static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
313#endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
314
315#ifdef CONFIG_MEMORY_HOTREMOVE
316
317extern void try_offline_node(int nid);
318extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
319extern int remove_memory(int nid, u64 start, u64 size);
320extern void __remove_memory(int nid, u64 start, u64 size);
321extern int offline_and_remove_memory(int nid, u64 start, u64 size);
322
323#else
324static inline void try_offline_node(int nid) {}
325
326static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
327{
328 return -EINVAL;
329}
330
331static inline int remove_memory(int nid, u64 start, u64 size)
332{
333 return -EBUSY;
334}
335
336static inline void __remove_memory(int nid, u64 start, u64 size) {}
337#endif /* CONFIG_MEMORY_HOTREMOVE */
338
339extern void set_zone_contiguous(struct zone *zone);
340extern void clear_zone_contiguous(struct zone *zone);
341
342extern void __ref free_area_init_core_hotplug(int nid);
343extern int __add_memory(int nid, u64 start, u64 size);
344extern int add_memory(int nid, u64 start, u64 size);
345extern int add_memory_resource(int nid, struct resource *resource);
346extern int add_memory_driver_managed(int nid, u64 start, u64 size,
347 const char *resource_name);
348extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
349 unsigned long nr_pages, struct vmem_altmap *altmap);
350extern void remove_pfn_range_from_zone(struct zone *zone,
351 unsigned long start_pfn,
352 unsigned long nr_pages);
353extern bool is_memblock_offlined(struct memory_block *mem);
354extern int sparse_add_section(int nid, unsigned long pfn,
355 unsigned long nr_pages, struct vmem_altmap *altmap);
356extern void sparse_remove_section(struct mem_section *ms,
357 unsigned long pfn, unsigned long nr_pages,
358 unsigned long map_offset, struct vmem_altmap *altmap);
359extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
360 unsigned long pnum);
361extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
362 int online_type);
363extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
364 unsigned long nr_pages);
365#endif /* __LINUX_MEMORY_HOTPLUG_H */