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 * pgdat resizing functions
56 */
57static inline
58void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
59{
60 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
61}
62static inline
63void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
64{
65 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
66}
67static inline
68void pgdat_resize_init(struct pglist_data *pgdat)
69{
70 spin_lock_init(&pgdat->node_size_lock);
71}
72/*
73 * Zone resizing functions
74 *
75 * Note: any attempt to resize a zone should has pgdat_resize_lock()
76 * zone_span_writelock() both held. This ensure the size of a zone
77 * can't be changed while pgdat_resize_lock() held.
78 */
79static inline unsigned zone_span_seqbegin(struct zone *zone)
80{
81 return read_seqbegin(&zone->span_seqlock);
82}
83static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
84{
85 return read_seqretry(&zone->span_seqlock, iv);
86}
87static inline void zone_span_writelock(struct zone *zone)
88{
89 write_seqlock(&zone->span_seqlock);
90}
91static inline void zone_span_writeunlock(struct zone *zone)
92{
93 write_sequnlock(&zone->span_seqlock);
94}
95static inline void zone_seqlock_init(struct zone *zone)
96{
97 seqlock_init(&zone->span_seqlock);
98}
99extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
100extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
101extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
102/* VM interface that may be used by firmware interface */
103extern int online_pages(unsigned long, unsigned long, int);
104extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
105 unsigned long *valid_start, unsigned long *valid_end);
106extern void __offline_isolated_pages(unsigned long, unsigned long);
107
108typedef void (*online_page_callback_t)(struct page *page);
109
110extern int set_online_page_callback(online_page_callback_t callback);
111extern int restore_online_page_callback(online_page_callback_t callback);
112
113extern void __online_page_set_limits(struct page *page);
114extern void __online_page_increment_counters(struct page *page);
115extern void __online_page_free(struct page *page);
116
117extern int try_online_node(int nid);
118
119extern bool memhp_auto_online;
120/* If movable_node boot option specified */
121extern bool movable_node_enabled;
122static inline bool movable_node_is_enabled(void)
123{
124 return movable_node_enabled;
125}
126
127#ifdef CONFIG_MEMORY_HOTREMOVE
128extern bool is_pageblock_removable_nolock(struct page *page);
129extern int arch_remove_memory(u64 start, u64 size,
130 struct vmem_altmap *altmap);
131extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
132 unsigned long nr_pages, struct vmem_altmap *altmap);
133#endif /* CONFIG_MEMORY_HOTREMOVE */
134
135/* reasonably generic interface to expand the physical pages */
136extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
137 struct vmem_altmap *altmap, bool want_memblock);
138
139#ifndef CONFIG_ARCH_HAS_ADD_PAGES
140static inline int add_pages(int nid, unsigned long start_pfn,
141 unsigned long nr_pages, struct vmem_altmap *altmap,
142 bool want_memblock)
143{
144 return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
145}
146#else /* ARCH_HAS_ADD_PAGES */
147int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
148 struct vmem_altmap *altmap, bool want_memblock);
149#endif /* ARCH_HAS_ADD_PAGES */
150
151#ifdef CONFIG_NUMA
152extern int memory_add_physaddr_to_nid(u64 start);
153#else
154static inline int memory_add_physaddr_to_nid(u64 start)
155{
156 return 0;
157}
158#endif
159
160#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
161/*
162 * For supporting node-hotadd, we have to allocate a new pgdat.
163 *
164 * If an arch has generic style NODE_DATA(),
165 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
166 *
167 * In general, generic_alloc_nodedata() is used.
168 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
169 *
170 */
171extern pg_data_t *arch_alloc_nodedata(int nid);
172extern void arch_free_nodedata(pg_data_t *pgdat);
173extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
174
175#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
176
177#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
178#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
179
180#ifdef CONFIG_NUMA
181/*
182 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
183 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
184 * Because, pgdat for the new node is not allocated/initialized yet itself.
185 * To use new node's memory, more consideration will be necessary.
186 */
187#define generic_alloc_nodedata(nid) \
188({ \
189 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
190})
191/*
192 * This definition is just for error path in node hotadd.
193 * For node hotremove, we have to replace this.
194 */
195#define generic_free_nodedata(pgdat) kfree(pgdat)
196
197extern pg_data_t *node_data[];
198static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
199{
200 node_data[nid] = pgdat;
201}
202
203#else /* !CONFIG_NUMA */
204
205/* never called */
206static inline pg_data_t *generic_alloc_nodedata(int nid)
207{
208 BUG();
209 return NULL;
210}
211static inline void generic_free_nodedata(pg_data_t *pgdat)
212{
213}
214static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
215{
216}
217#endif /* CONFIG_NUMA */
218#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
219
220#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
221extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
222#else
223static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
224{
225}
226#endif
227extern void put_page_bootmem(struct page *page);
228extern void get_page_bootmem(unsigned long ingo, struct page *page,
229 unsigned long type);
230
231void get_online_mems(void);
232void put_online_mems(void);
233
234void mem_hotplug_begin(void);
235void mem_hotplug_done(void);
236
237extern void set_zone_contiguous(struct zone *zone);
238extern void clear_zone_contiguous(struct zone *zone);
239
240#else /* ! CONFIG_MEMORY_HOTPLUG */
241#define pfn_to_online_page(pfn) \
242({ \
243 struct page *___page = NULL; \
244 if (pfn_valid(pfn)) \
245 ___page = pfn_to_page(pfn); \
246 ___page; \
247 })
248
249/*
250 * Stub functions for when hotplug is off
251 */
252static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
253static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
254static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
255
256static inline unsigned zone_span_seqbegin(struct zone *zone)
257{
258 return 0;
259}
260static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
261{
262 return 0;
263}
264static inline void zone_span_writelock(struct zone *zone) {}
265static inline void zone_span_writeunlock(struct zone *zone) {}
266static inline void zone_seqlock_init(struct zone *zone) {}
267
268static inline int mhp_notimplemented(const char *func)
269{
270 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
271 dump_stack();
272 return -ENOSYS;
273}
274
275static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
276{
277}
278
279static inline int try_online_node(int nid)
280{
281 return 0;
282}
283
284static inline void get_online_mems(void) {}
285static inline void put_online_mems(void) {}
286
287static inline void mem_hotplug_begin(void) {}
288static inline void mem_hotplug_done(void) {}
289
290static inline bool movable_node_is_enabled(void)
291{
292 return false;
293}
294#endif /* ! CONFIG_MEMORY_HOTPLUG */
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 */