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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 * Restrictions for the memory hotplug:
58 * flags: MHP_ flags
59 * altmap: alternative allocator for memmap array
60 */
61struct mhp_restrictions {
62 unsigned long flags;
63 struct vmem_altmap *altmap;
64};
65
66/*
67 * Zone resizing functions
68 *
69 * Note: any attempt to resize a zone should has pgdat_resize_lock()
70 * zone_span_writelock() both held. This ensure the size of a zone
71 * can't be changed while pgdat_resize_lock() held.
72 */
73static inline unsigned zone_span_seqbegin(struct zone *zone)
74{
75 return read_seqbegin(&zone->span_seqlock);
76}
77static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
78{
79 return read_seqretry(&zone->span_seqlock, iv);
80}
81static inline void zone_span_writelock(struct zone *zone)
82{
83 write_seqlock(&zone->span_seqlock);
84}
85static inline void zone_span_writeunlock(struct zone *zone)
86{
87 write_sequnlock(&zone->span_seqlock);
88}
89static inline void zone_seqlock_init(struct zone *zone)
90{
91 seqlock_init(&zone->span_seqlock);
92}
93extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
94extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
95extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
96/* VM interface that may be used by firmware interface */
97extern int online_pages(unsigned long, unsigned long, int);
98extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
99 unsigned long *valid_start, unsigned long *valid_end);
100extern unsigned long __offline_isolated_pages(unsigned long start_pfn,
101 unsigned long end_pfn);
102
103typedef void (*online_page_callback_t)(struct page *page, unsigned int order);
104
105extern int set_online_page_callback(online_page_callback_t callback);
106extern int restore_online_page_callback(online_page_callback_t callback);
107
108extern void __online_page_set_limits(struct page *page);
109extern void __online_page_increment_counters(struct page *page);
110extern void __online_page_free(struct page *page);
111
112extern int try_online_node(int nid);
113
114extern int arch_add_memory(int nid, u64 start, u64 size,
115 struct mhp_restrictions *restrictions);
116extern u64 max_mem_size;
117
118extern bool memhp_auto_online;
119/* If movable_node boot option specified */
120extern bool movable_node_enabled;
121static inline bool movable_node_is_enabled(void)
122{
123 return movable_node_enabled;
124}
125
126#ifdef CONFIG_MEMORY_HOTREMOVE
127extern void arch_remove_memory(int nid, u64 start, u64 size,
128 struct vmem_altmap *altmap);
129extern void __remove_pages(struct zone *zone, unsigned long start_pfn,
130 unsigned long nr_pages, struct vmem_altmap *altmap);
131#endif /* CONFIG_MEMORY_HOTREMOVE */
132
133/*
134 * Do we want sysfs memblock files created. This will allow userspace to online
135 * and offline memory explicitly. Lack of this bit means that the caller has to
136 * call move_pfn_range_to_zone to finish the initialization.
137 */
138
139#define MHP_MEMBLOCK_API (1<<0)
140
141/* reasonably generic interface to expand the physical pages */
142extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
143 struct mhp_restrictions *restrictions);
144
145#ifndef CONFIG_ARCH_HAS_ADD_PAGES
146static inline int add_pages(int nid, unsigned long start_pfn,
147 unsigned long nr_pages, struct mhp_restrictions *restrictions)
148{
149 return __add_pages(nid, start_pfn, nr_pages, restrictions);
150}
151#else /* ARCH_HAS_ADD_PAGES */
152int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
153 struct mhp_restrictions *restrictions);
154#endif /* ARCH_HAS_ADD_PAGES */
155
156#ifdef CONFIG_NUMA
157extern int memory_add_physaddr_to_nid(u64 start);
158#else
159static inline int memory_add_physaddr_to_nid(u64 start)
160{
161 return 0;
162}
163#endif
164
165#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
166/*
167 * For supporting node-hotadd, we have to allocate a new pgdat.
168 *
169 * If an arch has generic style NODE_DATA(),
170 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
171 *
172 * In general, generic_alloc_nodedata() is used.
173 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
174 *
175 */
176extern pg_data_t *arch_alloc_nodedata(int nid);
177extern void arch_free_nodedata(pg_data_t *pgdat);
178extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
179
180#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
181
182#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
183#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
184
185#ifdef CONFIG_NUMA
186/*
187 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
188 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
189 * Because, pgdat for the new node is not allocated/initialized yet itself.
190 * To use new node's memory, more consideration will be necessary.
191 */
192#define generic_alloc_nodedata(nid) \
193({ \
194 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
195})
196/*
197 * This definition is just for error path in node hotadd.
198 * For node hotremove, we have to replace this.
199 */
200#define generic_free_nodedata(pgdat) kfree(pgdat)
201
202extern pg_data_t *node_data[];
203static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
204{
205 node_data[nid] = pgdat;
206}
207
208#else /* !CONFIG_NUMA */
209
210/* never called */
211static inline pg_data_t *generic_alloc_nodedata(int nid)
212{
213 BUG();
214 return NULL;
215}
216static inline void generic_free_nodedata(pg_data_t *pgdat)
217{
218}
219static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
220{
221}
222#endif /* CONFIG_NUMA */
223#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
224
225#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
226extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
227#else
228static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
229{
230}
231#endif
232extern void put_page_bootmem(struct page *page);
233extern void get_page_bootmem(unsigned long ingo, struct page *page,
234 unsigned long type);
235
236void get_online_mems(void);
237void put_online_mems(void);
238
239void mem_hotplug_begin(void);
240void mem_hotplug_done(void);
241
242extern void set_zone_contiguous(struct zone *zone);
243extern void clear_zone_contiguous(struct zone *zone);
244
245#else /* ! CONFIG_MEMORY_HOTPLUG */
246#define pfn_to_online_page(pfn) \
247({ \
248 struct page *___page = NULL; \
249 if (pfn_valid(pfn)) \
250 ___page = pfn_to_page(pfn); \
251 ___page; \
252 })
253
254static inline unsigned zone_span_seqbegin(struct zone *zone)
255{
256 return 0;
257}
258static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
259{
260 return 0;
261}
262static inline void zone_span_writelock(struct zone *zone) {}
263static inline void zone_span_writeunlock(struct zone *zone) {}
264static inline void zone_seqlock_init(struct zone *zone) {}
265
266static inline int mhp_notimplemented(const char *func)
267{
268 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
269 dump_stack();
270 return -ENOSYS;
271}
272
273static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
274{
275}
276
277static inline int try_online_node(int nid)
278{
279 return 0;
280}
281
282static inline void get_online_mems(void) {}
283static inline void put_online_mems(void) {}
284
285static inline void mem_hotplug_begin(void) {}
286static inline void mem_hotplug_done(void) {}
287
288static inline bool movable_node_is_enabled(void)
289{
290 return false;
291}
292#endif /* ! CONFIG_MEMORY_HOTPLUG */
293
294#if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
295/*
296 * pgdat resizing functions
297 */
298static inline
299void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
300{
301 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
302}
303static inline
304void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
305{
306 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
307}
308static inline
309void pgdat_resize_init(struct pglist_data *pgdat)
310{
311 spin_lock_init(&pgdat->node_size_lock);
312}
313#else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
314/*
315 * Stub functions for when hotplug is off
316 */
317static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
318static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
319static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
320#endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
321
322#ifdef CONFIG_MEMORY_HOTREMOVE
323
324extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
325extern void try_offline_node(int nid);
326extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
327extern void remove_memory(int nid, u64 start, u64 size);
328extern void __remove_memory(int nid, u64 start, u64 size);
329
330#else
331static inline bool is_mem_section_removable(unsigned long pfn,
332 unsigned long nr_pages)
333{
334 return false;
335}
336
337static inline void try_offline_node(int nid) {}
338
339static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
340{
341 return -EINVAL;
342}
343
344static inline void remove_memory(int nid, u64 start, u64 size) {}
345static inline void __remove_memory(int nid, u64 start, u64 size) {}
346#endif /* CONFIG_MEMORY_HOTREMOVE */
347
348extern void __ref free_area_init_core_hotplug(int nid);
349extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
350 void *arg, int (*func)(struct memory_block *, void *));
351extern int __add_memory(int nid, u64 start, u64 size);
352extern int add_memory(int nid, u64 start, u64 size);
353extern int add_memory_resource(int nid, struct resource *resource);
354extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
355 unsigned long nr_pages, struct vmem_altmap *altmap);
356extern bool is_memblock_offlined(struct memory_block *mem);
357extern int sparse_add_one_section(int nid, unsigned long start_pfn,
358 struct vmem_altmap *altmap);
359extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
360 unsigned long map_offset, struct vmem_altmap *altmap);
361extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
362 unsigned long pnum);
363extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
364 int online_type);
365extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
366 unsigned long nr_pages);
367#endif /* __LINUX_MEMORY_HOTPLUG_H */