This source file includes following definitions.
- pcpu_populate_chunk
- pcpu_depopulate_chunk
- pcpu_create_chunk
- pcpu_destroy_chunk
- pcpu_addr_to_page
- pcpu_verify_alloc_info
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29 #if defined(CONFIG_SMP) && defined(CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK)
30 #error "contiguous percpu allocation is incompatible with paged first chunk"
31 #endif
32
33 #include <linux/log2.h>
34
35 static int pcpu_populate_chunk(struct pcpu_chunk *chunk,
36 int page_start, int page_end, gfp_t gfp)
37 {
38 return 0;
39 }
40
41 static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk,
42 int page_start, int page_end)
43 {
44
45 }
46
47 static struct pcpu_chunk *pcpu_create_chunk(gfp_t gfp)
48 {
49 const int nr_pages = pcpu_group_sizes[0] >> PAGE_SHIFT;
50 struct pcpu_chunk *chunk;
51 struct page *pages;
52 unsigned long flags;
53 int i;
54
55 chunk = pcpu_alloc_chunk(gfp);
56 if (!chunk)
57 return NULL;
58
59 pages = alloc_pages(gfp, order_base_2(nr_pages));
60 if (!pages) {
61 pcpu_free_chunk(chunk);
62 return NULL;
63 }
64
65 for (i = 0; i < nr_pages; i++)
66 pcpu_set_page_chunk(nth_page(pages, i), chunk);
67
68 chunk->data = pages;
69 chunk->base_addr = page_address(pages);
70
71 spin_lock_irqsave(&pcpu_lock, flags);
72 pcpu_chunk_populated(chunk, 0, nr_pages);
73 spin_unlock_irqrestore(&pcpu_lock, flags);
74
75 pcpu_stats_chunk_alloc();
76 trace_percpu_create_chunk(chunk->base_addr);
77
78 return chunk;
79 }
80
81 static void pcpu_destroy_chunk(struct pcpu_chunk *chunk)
82 {
83 const int nr_pages = pcpu_group_sizes[0] >> PAGE_SHIFT;
84
85 if (!chunk)
86 return;
87
88 pcpu_stats_chunk_dealloc();
89 trace_percpu_destroy_chunk(chunk->base_addr);
90
91 if (chunk->data)
92 __free_pages(chunk->data, order_base_2(nr_pages));
93 pcpu_free_chunk(chunk);
94 }
95
96 static struct page *pcpu_addr_to_page(void *addr)
97 {
98 return virt_to_page(addr);
99 }
100
101 static int __init pcpu_verify_alloc_info(const struct pcpu_alloc_info *ai)
102 {
103 size_t nr_pages, alloc_pages;
104
105
106 if (ai->nr_groups != 1) {
107 pr_crit("can't handle more than one group\n");
108 return -EINVAL;
109 }
110
111 nr_pages = (ai->groups[0].nr_units * ai->unit_size) >> PAGE_SHIFT;
112 alloc_pages = roundup_pow_of_two(nr_pages);
113
114 if (alloc_pages > nr_pages)
115 pr_warn("wasting %zu pages per chunk\n",
116 alloc_pages - nr_pages);
117
118 return 0;
119 }