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13static struct page *pcpu_chunk_page(struct pcpu_chunk *chunk,
14 unsigned int cpu, int page_idx)
15{
16
17 WARN_ON(chunk->immutable);
18
19 return vmalloc_to_page((void *)pcpu_chunk_addr(chunk, cpu, page_idx));
20}
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32static struct page **pcpu_get_pages(void)
33{
34 static struct page **pages;
35 size_t pages_size = pcpu_nr_units * pcpu_unit_pages * sizeof(pages[0]);
36
37 lockdep_assert_held(&pcpu_alloc_mutex);
38
39 if (!pages)
40 pages = pcpu_mem_zalloc(pages_size, GFP_KERNEL);
41 return pages;
42}
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54static void pcpu_free_pages(struct pcpu_chunk *chunk,
55 struct page **pages, int page_start, int page_end)
56{
57 unsigned int cpu;
58 int i;
59
60 for_each_possible_cpu(cpu) {
61 for (i = page_start; i < page_end; i++) {
62 struct page *page = pages[pcpu_page_idx(cpu, i)];
63
64 if (page)
65 __free_page(page);
66 }
67 }
68}
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82static int pcpu_alloc_pages(struct pcpu_chunk *chunk,
83 struct page **pages, int page_start, int page_end,
84 gfp_t gfp)
85{
86 unsigned int cpu, tcpu;
87 int i;
88
89 gfp |= __GFP_HIGHMEM;
90
91 for_each_possible_cpu(cpu) {
92 for (i = page_start; i < page_end; i++) {
93 struct page **pagep = &pages[pcpu_page_idx(cpu, i)];
94
95 *pagep = alloc_pages_node(cpu_to_node(cpu), gfp, 0);
96 if (!*pagep)
97 goto err;
98 }
99 }
100 return 0;
101
102err:
103 while (--i >= page_start)
104 __free_page(pages[pcpu_page_idx(cpu, i)]);
105
106 for_each_possible_cpu(tcpu) {
107 if (tcpu == cpu)
108 break;
109 for (i = page_start; i < page_end; i++)
110 __free_page(pages[pcpu_page_idx(tcpu, i)]);
111 }
112 return -ENOMEM;
113}
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126
127static void pcpu_pre_unmap_flush(struct pcpu_chunk *chunk,
128 int page_start, int page_end)
129{
130 flush_cache_vunmap(
131 pcpu_chunk_addr(chunk, pcpu_low_unit_cpu, page_start),
132 pcpu_chunk_addr(chunk, pcpu_high_unit_cpu, page_end));
133}
134
135static void __pcpu_unmap_pages(unsigned long addr, int nr_pages)
136{
137 unmap_kernel_range_noflush(addr, nr_pages << PAGE_SHIFT);
138}
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153static void pcpu_unmap_pages(struct pcpu_chunk *chunk,
154 struct page **pages, int page_start, int page_end)
155{
156 unsigned int cpu;
157 int i;
158
159 for_each_possible_cpu(cpu) {
160 for (i = page_start; i < page_end; i++) {
161 struct page *page;
162
163 page = pcpu_chunk_page(chunk, cpu, i);
164 WARN_ON(!page);
165 pages[pcpu_page_idx(cpu, i)] = page;
166 }
167 __pcpu_unmap_pages(pcpu_chunk_addr(chunk, cpu, page_start),
168 page_end - page_start);
169 }
170}
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185static void pcpu_post_unmap_tlb_flush(struct pcpu_chunk *chunk,
186 int page_start, int page_end)
187{
188 flush_tlb_kernel_range(
189 pcpu_chunk_addr(chunk, pcpu_low_unit_cpu, page_start),
190 pcpu_chunk_addr(chunk, pcpu_high_unit_cpu, page_end));
191}
192
193static int __pcpu_map_pages(unsigned long addr, struct page **pages,
194 int nr_pages)
195{
196 return map_kernel_range_noflush(addr, nr_pages << PAGE_SHIFT,
197 PAGE_KERNEL, pages);
198}
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214static int pcpu_map_pages(struct pcpu_chunk *chunk,
215 struct page **pages, int page_start, int page_end)
216{
217 unsigned int cpu, tcpu;
218 int i, err;
219
220 for_each_possible_cpu(cpu) {
221 err = __pcpu_map_pages(pcpu_chunk_addr(chunk, cpu, page_start),
222 &pages[pcpu_page_idx(cpu, page_start)],
223 page_end - page_start);
224 if (err < 0)
225 goto err;
226
227 for (i = page_start; i < page_end; i++)
228 pcpu_set_page_chunk(pages[pcpu_page_idx(cpu, i)],
229 chunk);
230 }
231 return 0;
232err:
233 for_each_possible_cpu(tcpu) {
234 if (tcpu == cpu)
235 break;
236 __pcpu_unmap_pages(pcpu_chunk_addr(chunk, tcpu, page_start),
237 page_end - page_start);
238 }
239 pcpu_post_unmap_tlb_flush(chunk, page_start, page_end);
240 return err;
241}
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255static void pcpu_post_map_flush(struct pcpu_chunk *chunk,
256 int page_start, int page_end)
257{
258 flush_cache_vmap(
259 pcpu_chunk_addr(chunk, pcpu_low_unit_cpu, page_start),
260 pcpu_chunk_addr(chunk, pcpu_high_unit_cpu, page_end));
261}
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276static int pcpu_populate_chunk(struct pcpu_chunk *chunk,
277 int page_start, int page_end, gfp_t gfp)
278{
279 struct page **pages;
280
281 pages = pcpu_get_pages();
282 if (!pages)
283 return -ENOMEM;
284
285 if (pcpu_alloc_pages(chunk, pages, page_start, page_end, gfp))
286 return -ENOMEM;
287
288 if (pcpu_map_pages(chunk, pages, page_start, page_end)) {
289 pcpu_free_pages(chunk, pages, page_start, page_end);
290 return -ENOMEM;
291 }
292 pcpu_post_map_flush(chunk, page_start, page_end);
293
294 return 0;
295}
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309static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk,
310 int page_start, int page_end)
311{
312 struct page **pages;
313
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319 pages = pcpu_get_pages();
320 BUG_ON(!pages);
321
322
323 pcpu_pre_unmap_flush(chunk, page_start, page_end);
324
325 pcpu_unmap_pages(chunk, pages, page_start, page_end);
326
327
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329 pcpu_free_pages(chunk, pages, page_start, page_end);
330}
331
332static struct pcpu_chunk *pcpu_create_chunk(gfp_t gfp)
333{
334 struct pcpu_chunk *chunk;
335 struct vm_struct **vms;
336
337 chunk = pcpu_alloc_chunk(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
378 return 0;
379}
380