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1/*
2 * mm/percpu-vm.c - vmalloc area based chunk allocation
3 *
4 * Copyright (C) 2010 SUSE Linux Products GmbH
5 * Copyright (C) 2010 Tejun Heo <tj@kernel.org>
6 *
7 * This file is released under the GPLv2.
8 *
9 * Chunks are mapped into vmalloc areas and populated page by page.
10 * This is the default chunk allocator.
11 */
12
13static struct page *pcpu_chunk_page(struct pcpu_chunk *chunk,
14 unsigned int cpu, int page_idx)
15{
16 /* must not be used on pre-mapped chunk */
17 WARN_ON(chunk->immutable);
18
19 return vmalloc_to_page((void *)pcpu_chunk_addr(chunk, cpu, page_idx));
20}
21
22/**
23 * pcpu_get_pages - get temp pages array
24 * @chunk: chunk of interest
25 *
26 * Returns pointer to array of pointers to struct page which can be indexed
27 * with pcpu_page_idx(). Note that there is only one array and accesses
28 * should be serialized by pcpu_alloc_mutex.
29 *
30 * RETURNS:
31 * Pointer to temp pages array on success.
32 */
33static struct page **pcpu_get_pages(struct pcpu_chunk *chunk_alloc)
34{
35 static struct page **pages;
36 size_t pages_size = pcpu_nr_units * pcpu_unit_pages * sizeof(pages[0]);
37
38 lockdep_assert_held(&pcpu_alloc_mutex);
39
40 if (!pages)
41 pages = pcpu_mem_zalloc(pages_size);
42 return pages;
43}
44
45/**
46 * pcpu_free_pages - free pages which were allocated for @chunk
47 * @chunk: chunk pages were allocated for
48 * @pages: array of pages to be freed, indexed by pcpu_page_idx()
49 * @page_start: page index of the first page to be freed
50 * @page_end: page index of the last page to be freed + 1
51 *
52 * Free pages [@page_start and @page_end) in @pages for all units.
53 * The pages were allocated for @chunk.
54 */
55static void pcpu_free_pages(struct pcpu_chunk *chunk,
56 struct page **pages, int page_start, int page_end)
57{
58 unsigned int cpu;
59 int i;
60
61 for_each_possible_cpu(cpu) {
62 for (i = page_start; i < page_end; i++) {
63 struct page *page = pages[pcpu_page_idx(cpu, i)];
64
65 if (page)
66 __free_page(page);
67 }
68 }
69}
70
71/**
72 * pcpu_alloc_pages - allocates pages for @chunk
73 * @chunk: target chunk
74 * @pages: array to put the allocated pages into, indexed by pcpu_page_idx()
75 * @page_start: page index of the first page to be allocated
76 * @page_end: page index of the last page to be allocated + 1
77 *
78 * Allocate pages [@page_start,@page_end) into @pages for all units.
79 * The allocation is for @chunk. Percpu core doesn't care about the
80 * content of @pages and will pass it verbatim to pcpu_map_pages().
81 */
82static int pcpu_alloc_pages(struct pcpu_chunk *chunk,
83 struct page **pages, int page_start, int page_end)
84{
85 const gfp_t gfp = GFP_KERNEL | __GFP_HIGHMEM | __GFP_COLD;
86 unsigned int cpu, tcpu;
87 int i;
88
89 for_each_possible_cpu(cpu) {
90 for (i = page_start; i < page_end; i++) {
91 struct page **pagep = &pages[pcpu_page_idx(cpu, i)];
92
93 *pagep = alloc_pages_node(cpu_to_node(cpu), gfp, 0);
94 if (!*pagep)
95 goto err;
96 }
97 }
98 return 0;
99
100err:
101 while (--i >= page_start)
102 __free_page(pages[pcpu_page_idx(cpu, i)]);
103
104 for_each_possible_cpu(tcpu) {
105 if (tcpu == cpu)
106 break;
107 for (i = page_start; i < page_end; i++)
108 __free_page(pages[pcpu_page_idx(tcpu, i)]);
109 }
110 return -ENOMEM;
111}
112
113/**
114 * pcpu_pre_unmap_flush - flush cache prior to unmapping
115 * @chunk: chunk the regions to be flushed belongs to
116 * @page_start: page index of the first page to be flushed
117 * @page_end: page index of the last page to be flushed + 1
118 *
119 * Pages in [@page_start,@page_end) of @chunk are about to be
120 * unmapped. Flush cache. As each flushing trial can be very
121 * expensive, issue flush on the whole region at once rather than
122 * doing it for each cpu. This could be an overkill but is more
123 * scalable.
124 */
125static void pcpu_pre_unmap_flush(struct pcpu_chunk *chunk,
126 int page_start, int page_end)
127{
128 flush_cache_vunmap(
129 pcpu_chunk_addr(chunk, pcpu_low_unit_cpu, page_start),
130 pcpu_chunk_addr(chunk, pcpu_high_unit_cpu, page_end));
131}
132
133static void __pcpu_unmap_pages(unsigned long addr, int nr_pages)
134{
135 unmap_kernel_range_noflush(addr, nr_pages << PAGE_SHIFT);
136}
137
138/**
139 * pcpu_unmap_pages - unmap pages out of a pcpu_chunk
140 * @chunk: chunk of interest
141 * @pages: pages array which can be used to pass information to free
142 * @page_start: page index of the first page to unmap
143 * @page_end: page index of the last page to unmap + 1
144 *
145 * For each cpu, unmap pages [@page_start,@page_end) out of @chunk.
146 * Corresponding elements in @pages were cleared by the caller and can
147 * be used to carry information to pcpu_free_pages() which will be
148 * called after all unmaps are finished. The caller should call
149 * proper pre/post flush functions.
150 */
151static void pcpu_unmap_pages(struct pcpu_chunk *chunk,
152 struct page **pages, int page_start, int page_end)
153{
154 unsigned int cpu;
155 int i;
156
157 for_each_possible_cpu(cpu) {
158 for (i = page_start; i < page_end; i++) {
159 struct page *page;
160
161 page = pcpu_chunk_page(chunk, cpu, i);
162 WARN_ON(!page);
163 pages[pcpu_page_idx(cpu, i)] = page;
164 }
165 __pcpu_unmap_pages(pcpu_chunk_addr(chunk, cpu, page_start),
166 page_end - page_start);
167 }
168}
169
170/**
171 * pcpu_post_unmap_tlb_flush - flush TLB after unmapping
172 * @chunk: pcpu_chunk the regions to be flushed belong to
173 * @page_start: page index of the first page to be flushed
174 * @page_end: page index of the last page to be flushed + 1
175 *
176 * Pages [@page_start,@page_end) of @chunk have been unmapped. Flush
177 * TLB for the regions. This can be skipped if the area is to be
178 * returned to vmalloc as vmalloc will handle TLB flushing lazily.
179 *
180 * As with pcpu_pre_unmap_flush(), TLB flushing also is done at once
181 * for the whole region.
182 */
183static void pcpu_post_unmap_tlb_flush(struct pcpu_chunk *chunk,
184 int page_start, int page_end)
185{
186 flush_tlb_kernel_range(
187 pcpu_chunk_addr(chunk, pcpu_low_unit_cpu, page_start),
188 pcpu_chunk_addr(chunk, pcpu_high_unit_cpu, page_end));
189}
190
191static int __pcpu_map_pages(unsigned long addr, struct page **pages,
192 int nr_pages)
193{
194 return map_kernel_range_noflush(addr, nr_pages << PAGE_SHIFT,
195 PAGE_KERNEL, pages);
196}
197
198/**
199 * pcpu_map_pages - map pages into a pcpu_chunk
200 * @chunk: chunk of interest
201 * @pages: pages array containing pages to be mapped
202 * @page_start: page index of the first page to map
203 * @page_end: page index of the last page to map + 1
204 *
205 * For each cpu, map pages [@page_start,@page_end) into @chunk. The
206 * caller is responsible for calling pcpu_post_map_flush() after all
207 * mappings are complete.
208 *
209 * This function is responsible for setting up whatever is necessary for
210 * reverse lookup (addr -> chunk).
211 */
212static int pcpu_map_pages(struct pcpu_chunk *chunk,
213 struct page **pages, int page_start, int page_end)
214{
215 unsigned int cpu, tcpu;
216 int i, err;
217
218 for_each_possible_cpu(cpu) {
219 err = __pcpu_map_pages(pcpu_chunk_addr(chunk, cpu, page_start),
220 &pages[pcpu_page_idx(cpu, page_start)],
221 page_end - page_start);
222 if (err < 0)
223 goto err;
224
225 for (i = page_start; i < page_end; i++)
226 pcpu_set_page_chunk(pages[pcpu_page_idx(cpu, i)],
227 chunk);
228 }
229 return 0;
230err:
231 for_each_possible_cpu(tcpu) {
232 if (tcpu == cpu)
233 break;
234 __pcpu_unmap_pages(pcpu_chunk_addr(chunk, tcpu, page_start),
235 page_end - page_start);
236 }
237 pcpu_post_unmap_tlb_flush(chunk, page_start, page_end);
238 return err;
239}
240
241/**
242 * pcpu_post_map_flush - flush cache after mapping
243 * @chunk: pcpu_chunk the regions to be flushed belong to
244 * @page_start: page index of the first page to be flushed
245 * @page_end: page index of the last page to be flushed + 1
246 *
247 * Pages [@page_start,@page_end) of @chunk have been mapped. Flush
248 * cache.
249 *
250 * As with pcpu_pre_unmap_flush(), TLB flushing also is done at once
251 * for the whole region.
252 */
253static void pcpu_post_map_flush(struct pcpu_chunk *chunk,
254 int page_start, int page_end)
255{
256 flush_cache_vmap(
257 pcpu_chunk_addr(chunk, pcpu_low_unit_cpu, page_start),
258 pcpu_chunk_addr(chunk, pcpu_high_unit_cpu, page_end));
259}
260
261/**
262 * pcpu_populate_chunk - populate and map an area of a pcpu_chunk
263 * @chunk: chunk of interest
264 * @page_start: the start page
265 * @page_end: the end page
266 *
267 * For each cpu, populate and map pages [@page_start,@page_end) into
268 * @chunk.
269 *
270 * CONTEXT:
271 * pcpu_alloc_mutex, does GFP_KERNEL allocation.
272 */
273static int pcpu_populate_chunk(struct pcpu_chunk *chunk,
274 int page_start, int page_end)
275{
276 struct page **pages;
277
278 pages = pcpu_get_pages(chunk);
279 if (!pages)
280 return -ENOMEM;
281
282 if (pcpu_alloc_pages(chunk, pages, page_start, page_end))
283 return -ENOMEM;
284
285 if (pcpu_map_pages(chunk, pages, page_start, page_end)) {
286 pcpu_free_pages(chunk, pages, page_start, page_end);
287 return -ENOMEM;
288 }
289 pcpu_post_map_flush(chunk, page_start, page_end);
290
291 return 0;
292}
293
294/**
295 * pcpu_depopulate_chunk - depopulate and unmap an area of a pcpu_chunk
296 * @chunk: chunk to depopulate
297 * @page_start: the start page
298 * @page_end: the end page
299 *
300 * For each cpu, depopulate and unmap pages [@page_start,@page_end)
301 * from @chunk.
302 *
303 * CONTEXT:
304 * pcpu_alloc_mutex.
305 */
306static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk,
307 int page_start, int page_end)
308{
309 struct page **pages;
310
311 /*
312 * If control reaches here, there must have been at least one
313 * successful population attempt so the temp pages array must
314 * be available now.
315 */
316 pages = pcpu_get_pages(chunk);
317 BUG_ON(!pages);
318
319 /* unmap and free */
320 pcpu_pre_unmap_flush(chunk, page_start, page_end);
321
322 pcpu_unmap_pages(chunk, pages, page_start, page_end);
323
324 /* no need to flush tlb, vmalloc will handle it lazily */
325
326 pcpu_free_pages(chunk, pages, page_start, page_end);
327}
328
329static struct pcpu_chunk *pcpu_create_chunk(void)
330{
331 struct pcpu_chunk *chunk;
332 struct vm_struct **vms;
333
334 chunk = pcpu_alloc_chunk();
335 if (!chunk)
336 return NULL;
337
338 vms = pcpu_get_vm_areas(pcpu_group_offsets, pcpu_group_sizes,
339 pcpu_nr_groups, pcpu_atom_size);
340 if (!vms) {
341 pcpu_free_chunk(chunk);
342 return NULL;
343 }
344
345 chunk->data = vms;
346 chunk->base_addr = vms[0]->addr - pcpu_group_offsets[0];
347 return chunk;
348}
349
350static void pcpu_destroy_chunk(struct pcpu_chunk *chunk)
351{
352 if (chunk && chunk->data)
353 pcpu_free_vm_areas(chunk->data, pcpu_nr_groups);
354 pcpu_free_chunk(chunk);
355}
356
357static struct page *pcpu_addr_to_page(void *addr)
358{
359 return vmalloc_to_page(addr);
360}
361
362static int __init pcpu_verify_alloc_info(const struct pcpu_alloc_info *ai)
363{
364 /* no extra restriction */
365 return 0;
366}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * mm/percpu-vm.c - vmalloc area based chunk allocation
4 *
5 * Copyright (C) 2010 SUSE Linux Products GmbH
6 * Copyright (C) 2010 Tejun Heo <tj@kernel.org>
7 *
8 * Chunks are mapped into vmalloc areas and populated page by page.
9 * This is the default chunk allocator.
10 */
11
12static struct page *pcpu_chunk_page(struct pcpu_chunk *chunk,
13 unsigned int cpu, int page_idx)
14{
15 /* must not be used on pre-mapped chunk */
16 WARN_ON(chunk->immutable);
17
18 return vmalloc_to_page((void *)pcpu_chunk_addr(chunk, cpu, page_idx));
19}
20
21/**
22 * pcpu_get_pages - get temp pages array
23 *
24 * Returns pointer to array of pointers to struct page which can be indexed
25 * with pcpu_page_idx(). Note that there is only one array and accesses
26 * should be serialized by pcpu_alloc_mutex.
27 *
28 * RETURNS:
29 * Pointer to temp pages array on success.
30 */
31static struct page **pcpu_get_pages(void)
32{
33 static struct page **pages;
34 size_t pages_size = pcpu_nr_units * pcpu_unit_pages * sizeof(pages[0]);
35
36 lockdep_assert_held(&pcpu_alloc_mutex);
37
38 if (!pages)
39 pages = pcpu_mem_zalloc(pages_size, GFP_KERNEL);
40 return pages;
41}
42
43/**
44 * pcpu_free_pages - free pages which were allocated for @chunk
45 * @chunk: chunk pages were allocated for
46 * @pages: array of pages to be freed, indexed by pcpu_page_idx()
47 * @page_start: page index of the first page to be freed
48 * @page_end: page index of the last page to be freed + 1
49 *
50 * Free pages [@page_start and @page_end) in @pages for all units.
51 * The pages were allocated for @chunk.
52 */
53static void pcpu_free_pages(struct pcpu_chunk *chunk,
54 struct page **pages, int page_start, int page_end)
55{
56 unsigned int cpu;
57 int i;
58
59 for_each_possible_cpu(cpu) {
60 for (i = page_start; i < page_end; i++) {
61 struct page *page = pages[pcpu_page_idx(cpu, i)];
62
63 if (page)
64 __free_page(page);
65 }
66 }
67}
68
69/**
70 * pcpu_alloc_pages - allocates pages for @chunk
71 * @chunk: target chunk
72 * @pages: array to put the allocated pages into, indexed by pcpu_page_idx()
73 * @page_start: page index of the first page to be allocated
74 * @page_end: page index of the last page to be allocated + 1
75 * @gfp: allocation flags passed to the underlying allocator
76 *
77 * Allocate pages [@page_start,@page_end) into @pages for all units.
78 * The allocation is for @chunk. Percpu core doesn't care about the
79 * content of @pages and will pass it verbatim to pcpu_map_pages().
80 */
81static int pcpu_alloc_pages(struct pcpu_chunk *chunk,
82 struct page **pages, int page_start, int page_end,
83 gfp_t gfp)
84{
85 unsigned int cpu, tcpu;
86 int i;
87
88 gfp |= __GFP_HIGHMEM;
89
90 for_each_possible_cpu(cpu) {
91 for (i = page_start; i < page_end; i++) {
92 struct page **pagep = &pages[pcpu_page_idx(cpu, i)];
93
94 *pagep = alloc_pages_node(cpu_to_node(cpu), gfp, 0);
95 if (!*pagep)
96 goto err;
97 }
98 }
99 return 0;
100
101err:
102 while (--i >= page_start)
103 __free_page(pages[pcpu_page_idx(cpu, i)]);
104
105 for_each_possible_cpu(tcpu) {
106 if (tcpu == cpu)
107 break;
108 for (i = page_start; i < page_end; i++)
109 __free_page(pages[pcpu_page_idx(tcpu, i)]);
110 }
111 return -ENOMEM;
112}
113
114/**
115 * pcpu_pre_unmap_flush - flush cache prior to unmapping
116 * @chunk: chunk the regions to be flushed belongs to
117 * @page_start: page index of the first page to be flushed
118 * @page_end: page index of the last page to be flushed + 1
119 *
120 * Pages in [@page_start,@page_end) of @chunk are about to be
121 * unmapped. Flush cache. As each flushing trial can be very
122 * expensive, issue flush on the whole region at once rather than
123 * doing it for each cpu. This could be an overkill but is more
124 * scalable.
125 */
126static void pcpu_pre_unmap_flush(struct pcpu_chunk *chunk,
127 int page_start, int page_end)
128{
129 flush_cache_vunmap(
130 pcpu_chunk_addr(chunk, pcpu_low_unit_cpu, page_start),
131 pcpu_chunk_addr(chunk, pcpu_high_unit_cpu, page_end));
132}
133
134static void __pcpu_unmap_pages(unsigned long addr, int nr_pages)
135{
136 unmap_kernel_range_noflush(addr, nr_pages << PAGE_SHIFT);
137}
138
139/**
140 * pcpu_unmap_pages - unmap pages out of a pcpu_chunk
141 * @chunk: chunk of interest
142 * @pages: pages array which can be used to pass information to free
143 * @page_start: page index of the first page to unmap
144 * @page_end: page index of the last page to unmap + 1
145 *
146 * For each cpu, unmap pages [@page_start,@page_end) out of @chunk.
147 * Corresponding elements in @pages were cleared by the caller and can
148 * be used to carry information to pcpu_free_pages() which will be
149 * called after all unmaps are finished. The caller should call
150 * proper pre/post flush functions.
151 */
152static void pcpu_unmap_pages(struct pcpu_chunk *chunk,
153 struct page **pages, int page_start, int page_end)
154{
155 unsigned int cpu;
156 int i;
157
158 for_each_possible_cpu(cpu) {
159 for (i = page_start; i < page_end; i++) {
160 struct page *page;
161
162 page = pcpu_chunk_page(chunk, cpu, i);
163 WARN_ON(!page);
164 pages[pcpu_page_idx(cpu, i)] = page;
165 }
166 __pcpu_unmap_pages(pcpu_chunk_addr(chunk, cpu, page_start),
167 page_end - page_start);
168 }
169}
170
171/**
172 * pcpu_post_unmap_tlb_flush - flush TLB after unmapping
173 * @chunk: pcpu_chunk the regions to be flushed belong to
174 * @page_start: page index of the first page to be flushed
175 * @page_end: page index of the last page to be flushed + 1
176 *
177 * Pages [@page_start,@page_end) of @chunk have been unmapped. Flush
178 * TLB for the regions. This can be skipped if the area is to be
179 * returned to vmalloc as vmalloc will handle TLB flushing lazily.
180 *
181 * As with pcpu_pre_unmap_flush(), TLB flushing also is done at once
182 * for the whole region.
183 */
184static void pcpu_post_unmap_tlb_flush(struct pcpu_chunk *chunk,
185 int page_start, int page_end)
186{
187 flush_tlb_kernel_range(
188 pcpu_chunk_addr(chunk, pcpu_low_unit_cpu, page_start),
189 pcpu_chunk_addr(chunk, pcpu_high_unit_cpu, page_end));
190}
191
192static int __pcpu_map_pages(unsigned long addr, struct page **pages,
193 int nr_pages)
194{
195 return map_kernel_range_noflush(addr, nr_pages << PAGE_SHIFT,
196 PAGE_KERNEL, pages);
197}
198
199/**
200 * pcpu_map_pages - map pages into a pcpu_chunk
201 * @chunk: chunk of interest
202 * @pages: pages array containing pages to be mapped
203 * @page_start: page index of the first page to map
204 * @page_end: page index of the last page to map + 1
205 *
206 * For each cpu, map pages [@page_start,@page_end) into @chunk. The
207 * caller is responsible for calling pcpu_post_map_flush() after all
208 * mappings are complete.
209 *
210 * This function is responsible for setting up whatever is necessary for
211 * reverse lookup (addr -> chunk).
212 */
213static int pcpu_map_pages(struct pcpu_chunk *chunk,
214 struct page **pages, int page_start, int page_end)
215{
216 unsigned int cpu, tcpu;
217 int i, err;
218
219 for_each_possible_cpu(cpu) {
220 err = __pcpu_map_pages(pcpu_chunk_addr(chunk, cpu, page_start),
221 &pages[pcpu_page_idx(cpu, page_start)],
222 page_end - page_start);
223 if (err < 0)
224 goto err;
225
226 for (i = page_start; i < page_end; i++)
227 pcpu_set_page_chunk(pages[pcpu_page_idx(cpu, i)],
228 chunk);
229 }
230 return 0;
231err:
232 for_each_possible_cpu(tcpu) {
233 if (tcpu == cpu)
234 break;
235 __pcpu_unmap_pages(pcpu_chunk_addr(chunk, tcpu, page_start),
236 page_end - page_start);
237 }
238 pcpu_post_unmap_tlb_flush(chunk, page_start, page_end);
239 return err;
240}
241
242/**
243 * pcpu_post_map_flush - flush cache after mapping
244 * @chunk: pcpu_chunk the regions to be flushed belong to
245 * @page_start: page index of the first page to be flushed
246 * @page_end: page index of the last page to be flushed + 1
247 *
248 * Pages [@page_start,@page_end) of @chunk have been mapped. Flush
249 * cache.
250 *
251 * As with pcpu_pre_unmap_flush(), TLB flushing also is done at once
252 * for the whole region.
253 */
254static void pcpu_post_map_flush(struct pcpu_chunk *chunk,
255 int page_start, int page_end)
256{
257 flush_cache_vmap(
258 pcpu_chunk_addr(chunk, pcpu_low_unit_cpu, page_start),
259 pcpu_chunk_addr(chunk, pcpu_high_unit_cpu, page_end));
260}
261
262/**
263 * pcpu_populate_chunk - populate and map an area of a pcpu_chunk
264 * @chunk: chunk of interest
265 * @page_start: the start page
266 * @page_end: the end page
267 * @gfp: allocation flags passed to the underlying memory allocator
268 *
269 * For each cpu, populate and map pages [@page_start,@page_end) into
270 * @chunk.
271 *
272 * CONTEXT:
273 * pcpu_alloc_mutex, does GFP_KERNEL allocation.
274 */
275static int pcpu_populate_chunk(struct pcpu_chunk *chunk,
276 int page_start, int page_end, gfp_t gfp)
277{
278 struct page **pages;
279
280 pages = pcpu_get_pages();
281 if (!pages)
282 return -ENOMEM;
283
284 if (pcpu_alloc_pages(chunk, pages, page_start, page_end, gfp))
285 return -ENOMEM;
286
287 if (pcpu_map_pages(chunk, pages, page_start, page_end)) {
288 pcpu_free_pages(chunk, pages, page_start, page_end);
289 return -ENOMEM;
290 }
291 pcpu_post_map_flush(chunk, page_start, page_end);
292
293 return 0;
294}
295
296/**
297 * pcpu_depopulate_chunk - depopulate and unmap an area of a pcpu_chunk
298 * @chunk: chunk to depopulate
299 * @page_start: the start page
300 * @page_end: the end page
301 *
302 * For each cpu, depopulate and unmap pages [@page_start,@page_end)
303 * from @chunk.
304 *
305 * CONTEXT:
306 * pcpu_alloc_mutex.
307 */
308static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk,
309 int page_start, int page_end)
310{
311 struct page **pages;
312
313 /*
314 * If control reaches here, there must have been at least one
315 * successful population attempt so the temp pages array must
316 * be available now.
317 */
318 pages = pcpu_get_pages();
319 BUG_ON(!pages);
320
321 /* unmap and free */
322 pcpu_pre_unmap_flush(chunk, page_start, page_end);
323
324 pcpu_unmap_pages(chunk, pages, page_start, page_end);
325
326 /* no need to flush tlb, vmalloc will handle it lazily */
327
328 pcpu_free_pages(chunk, pages, page_start, page_end);
329}
330
331static struct pcpu_chunk *pcpu_create_chunk(enum pcpu_chunk_type type,
332 gfp_t gfp)
333{
334 struct pcpu_chunk *chunk;
335 struct vm_struct **vms;
336
337 chunk = pcpu_alloc_chunk(type, gfp);
338 if (!chunk)
339 return NULL;
340
341 vms = pcpu_get_vm_areas(pcpu_group_offsets, pcpu_group_sizes,
342 pcpu_nr_groups, pcpu_atom_size);
343 if (!vms) {
344 pcpu_free_chunk(chunk);
345 return NULL;
346 }
347
348 chunk->data = vms;
349 chunk->base_addr = vms[0]->addr - pcpu_group_offsets[0];
350
351 pcpu_stats_chunk_alloc();
352 trace_percpu_create_chunk(chunk->base_addr);
353
354 return chunk;
355}
356
357static void pcpu_destroy_chunk(struct pcpu_chunk *chunk)
358{
359 if (!chunk)
360 return;
361
362 pcpu_stats_chunk_dealloc();
363 trace_percpu_destroy_chunk(chunk->base_addr);
364
365 if (chunk->data)
366 pcpu_free_vm_areas(chunk->data, pcpu_nr_groups);
367 pcpu_free_chunk(chunk);
368}
369
370static struct page *pcpu_addr_to_page(void *addr)
371{
372 return vmalloc_to_page(addr);
373}
374
375static int __init pcpu_verify_alloc_info(const struct pcpu_alloc_info *ai)
376{
377 /* no extra restriction */
378 return 0;
379}