Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 pfn, unsigned long nr_pages,
98 int online_type, int nid);
99extern struct zone *test_pages_in_a_zone(unsigned long start_pfn,
100 unsigned long end_pfn);
101extern unsigned long __offline_isolated_pages(unsigned long start_pfn,
102 unsigned long end_pfn);
103
104typedef void (*online_page_callback_t)(struct page *page, unsigned int order);
105
106extern void generic_online_page(struct page *page, unsigned int order);
107extern int set_online_page_callback(online_page_callback_t callback);
108extern int restore_online_page_callback(online_page_callback_t callback);
109
110extern int try_online_node(int nid);
111
112extern int arch_add_memory(int nid, u64 start, u64 size,
113 struct mhp_restrictions *restrictions);
114extern u64 max_mem_size;
115
116extern bool memhp_auto_online;
117/* If movable_node boot option specified */
118extern bool movable_node_enabled;
119static inline bool movable_node_is_enabled(void)
120{
121 return movable_node_enabled;
122}
123
124extern void arch_remove_memory(int nid, u64 start, u64 size,
125 struct vmem_altmap *altmap);
126extern void __remove_pages(unsigned long start_pfn, unsigned long nr_pages,
127 struct vmem_altmap *altmap);
128
129/* reasonably generic interface to expand the physical pages */
130extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
131 struct mhp_restrictions *restrictions);
132
133#ifndef CONFIG_ARCH_HAS_ADD_PAGES
134static inline int add_pages(int nid, unsigned long start_pfn,
135 unsigned long nr_pages, struct mhp_restrictions *restrictions)
136{
137 return __add_pages(nid, start_pfn, nr_pages, restrictions);
138}
139#else /* ARCH_HAS_ADD_PAGES */
140int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
141 struct mhp_restrictions *restrictions);
142#endif /* ARCH_HAS_ADD_PAGES */
143
144#ifdef CONFIG_NUMA
145extern int memory_add_physaddr_to_nid(u64 start);
146#else
147static inline int memory_add_physaddr_to_nid(u64 start)
148{
149 return 0;
150}
151#endif
152
153#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
154/*
155 * For supporting node-hotadd, we have to allocate a new pgdat.
156 *
157 * If an arch has generic style NODE_DATA(),
158 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
159 *
160 * In general, generic_alloc_nodedata() is used.
161 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
162 *
163 */
164extern pg_data_t *arch_alloc_nodedata(int nid);
165extern void arch_free_nodedata(pg_data_t *pgdat);
166extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
167
168#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
169
170#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
171#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
172
173#ifdef CONFIG_NUMA
174/*
175 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
176 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
177 * Because, pgdat for the new node is not allocated/initialized yet itself.
178 * To use new node's memory, more consideration will be necessary.
179 */
180#define generic_alloc_nodedata(nid) \
181({ \
182 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
183})
184/*
185 * This definition is just for error path in node hotadd.
186 * For node hotremove, we have to replace this.
187 */
188#define generic_free_nodedata(pgdat) kfree(pgdat)
189
190extern pg_data_t *node_data[];
191static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
192{
193 node_data[nid] = pgdat;
194}
195
196#else /* !CONFIG_NUMA */
197
198/* never called */
199static inline pg_data_t *generic_alloc_nodedata(int nid)
200{
201 BUG();
202 return NULL;
203}
204static inline void generic_free_nodedata(pg_data_t *pgdat)
205{
206}
207static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
208{
209}
210#endif /* CONFIG_NUMA */
211#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
212
213#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
214extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
215#else
216static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
217{
218}
219#endif
220extern void put_page_bootmem(struct page *page);
221extern void get_page_bootmem(unsigned long ingo, struct page *page,
222 unsigned long type);
223
224void get_online_mems(void);
225void put_online_mems(void);
226
227void mem_hotplug_begin(void);
228void mem_hotplug_done(void);
229
230#else /* ! CONFIG_MEMORY_HOTPLUG */
231#define pfn_to_online_page(pfn) \
232({ \
233 struct page *___page = NULL; \
234 if (pfn_valid(pfn)) \
235 ___page = pfn_to_page(pfn); \
236 ___page; \
237 })
238
239static inline unsigned zone_span_seqbegin(struct zone *zone)
240{
241 return 0;
242}
243static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
244{
245 return 0;
246}
247static inline void zone_span_writelock(struct zone *zone) {}
248static inline void zone_span_writeunlock(struct zone *zone) {}
249static inline void zone_seqlock_init(struct zone *zone) {}
250
251static inline int mhp_notimplemented(const char *func)
252{
253 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
254 dump_stack();
255 return -ENOSYS;
256}
257
258static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
259{
260}
261
262static inline int try_online_node(int nid)
263{
264 return 0;
265}
266
267static inline void get_online_mems(void) {}
268static inline void put_online_mems(void) {}
269
270static inline void mem_hotplug_begin(void) {}
271static inline void mem_hotplug_done(void) {}
272
273static inline bool movable_node_is_enabled(void)
274{
275 return false;
276}
277#endif /* ! CONFIG_MEMORY_HOTPLUG */
278
279#if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
280/*
281 * pgdat resizing functions
282 */
283static inline
284void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
285{
286 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
287}
288static inline
289void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
290{
291 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
292}
293static inline
294void pgdat_resize_init(struct pglist_data *pgdat)
295{
296 spin_lock_init(&pgdat->node_size_lock);
297}
298#else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
299/*
300 * Stub functions for when hotplug is off
301 */
302static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
303static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
304static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
305#endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
306
307#ifdef CONFIG_MEMORY_HOTREMOVE
308
309extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
310extern void try_offline_node(int nid);
311extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
312extern int remove_memory(int nid, u64 start, u64 size);
313extern void __remove_memory(int nid, u64 start, u64 size);
314
315#else
316static inline bool is_mem_section_removable(unsigned long pfn,
317 unsigned long nr_pages)
318{
319 return false;
320}
321
322static inline void try_offline_node(int nid) {}
323
324static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
325{
326 return -EINVAL;
327}
328
329static inline int remove_memory(int nid, u64 start, u64 size)
330{
331 return -EBUSY;
332}
333
334static inline void __remove_memory(int nid, u64 start, u64 size) {}
335#endif /* CONFIG_MEMORY_HOTREMOVE */
336
337extern void set_zone_contiguous(struct zone *zone);
338extern void clear_zone_contiguous(struct zone *zone);
339
340extern void __ref free_area_init_core_hotplug(int nid);
341extern int __add_memory(int nid, u64 start, u64 size);
342extern int add_memory(int nid, u64 start, u64 size);
343extern int add_memory_resource(int nid, struct resource *resource);
344extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
345 unsigned long nr_pages, struct vmem_altmap *altmap);
346extern void remove_pfn_range_from_zone(struct zone *zone,
347 unsigned long start_pfn,
348 unsigned long nr_pages);
349extern bool is_memblock_offlined(struct memory_block *mem);
350extern int sparse_add_section(int nid, unsigned long pfn,
351 unsigned long nr_pages, struct vmem_altmap *altmap);
352extern void sparse_remove_section(struct mem_section *ms,
353 unsigned long pfn, unsigned long nr_pages,
354 unsigned long map_offset, struct vmem_altmap *altmap);
355extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
356 unsigned long pnum);
357extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
358 int online_type);
359extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
360 unsigned long nr_pages);
361#endif /* __LINUX_MEMORY_HOTPLUG_H */