Commit | Line | Data |
---|---|---|
28b24c1f SL |
1 | /* |
2 | * CMA DebugFS Interface | |
3 | * | |
4 | * Copyright (c) 2015 Sasha Levin <sasha.levin@oracle.com> | |
5 | */ | |
6 | ||
7 | ||
8 | #include <linux/debugfs.h> | |
9 | #include <linux/cma.h> | |
26b02a1f SL |
10 | #include <linux/list.h> |
11 | #include <linux/kernel.h> | |
12 | #include <linux/slab.h> | |
8325330b | 13 | #include <linux/mm_types.h> |
28b24c1f SL |
14 | |
15 | #include "cma.h" | |
16 | ||
26b02a1f SL |
17 | struct cma_mem { |
18 | struct hlist_node node; | |
19 | struct page *p; | |
20 | unsigned long n; | |
21 | }; | |
22 | ||
28b24c1f SL |
23 | static struct dentry *cma_debugfs_root; |
24 | ||
25 | static int cma_debugfs_get(void *data, u64 *val) | |
26 | { | |
27 | unsigned long *p = data; | |
28 | ||
29 | *val = *p; | |
30 | ||
31 | return 0; | |
32 | } | |
33 | ||
34 | DEFINE_SIMPLE_ATTRIBUTE(cma_debugfs_fops, cma_debugfs_get, NULL, "%llu\n"); | |
35 | ||
26b02a1f SL |
36 | static void cma_add_to_cma_mem_list(struct cma *cma, struct cma_mem *mem) |
37 | { | |
38 | spin_lock(&cma->mem_head_lock); | |
39 | hlist_add_head(&mem->node, &cma->mem_head); | |
40 | spin_unlock(&cma->mem_head_lock); | |
41 | } | |
42 | ||
8325330b SL |
43 | static struct cma_mem *cma_get_entry_from_list(struct cma *cma) |
44 | { | |
45 | struct cma_mem *mem = NULL; | |
46 | ||
47 | spin_lock(&cma->mem_head_lock); | |
48 | if (!hlist_empty(&cma->mem_head)) { | |
49 | mem = hlist_entry(cma->mem_head.first, struct cma_mem, node); | |
50 | hlist_del_init(&mem->node); | |
51 | } | |
52 | spin_unlock(&cma->mem_head_lock); | |
53 | ||
54 | return mem; | |
55 | } | |
56 | ||
57 | static int cma_free_mem(struct cma *cma, int count) | |
58 | { | |
59 | struct cma_mem *mem = NULL; | |
60 | ||
61 | while (count) { | |
62 | mem = cma_get_entry_from_list(cma); | |
63 | if (mem == NULL) | |
64 | return 0; | |
65 | ||
66 | if (mem->n <= count) { | |
67 | cma_release(cma, mem->p, mem->n); | |
68 | count -= mem->n; | |
69 | kfree(mem); | |
70 | } else if (cma->order_per_bit == 0) { | |
71 | cma_release(cma, mem->p, count); | |
72 | mem->p += count; | |
73 | mem->n -= count; | |
74 | count = 0; | |
75 | cma_add_to_cma_mem_list(cma, mem); | |
76 | } else { | |
77 | pr_debug("cma: cannot release partial block when order_per_bit != 0\n"); | |
78 | cma_add_to_cma_mem_list(cma, mem); | |
79 | break; | |
80 | } | |
81 | } | |
82 | ||
83 | return 0; | |
84 | ||
85 | } | |
86 | ||
87 | static int cma_free_write(void *data, u64 val) | |
88 | { | |
89 | int pages = val; | |
90 | struct cma *cma = data; | |
91 | ||
92 | return cma_free_mem(cma, pages); | |
93 | } | |
94 | ||
95 | DEFINE_SIMPLE_ATTRIBUTE(cma_free_fops, NULL, cma_free_write, "%llu\n"); | |
96 | ||
26b02a1f SL |
97 | static int cma_alloc_mem(struct cma *cma, int count) |
98 | { | |
99 | struct cma_mem *mem; | |
100 | struct page *p; | |
101 | ||
102 | mem = kzalloc(sizeof(*mem), GFP_KERNEL); | |
103 | if (!mem) | |
104 | return -ENOMEM; | |
105 | ||
106 | p = cma_alloc(cma, count, CONFIG_CMA_ALIGNMENT); | |
107 | if (!p) { | |
108 | kfree(mem); | |
109 | return -ENOMEM; | |
110 | } | |
111 | ||
112 | mem->p = p; | |
113 | mem->n = count; | |
114 | ||
115 | cma_add_to_cma_mem_list(cma, mem); | |
116 | ||
117 | return 0; | |
118 | } | |
119 | ||
120 | static int cma_alloc_write(void *data, u64 val) | |
121 | { | |
122 | int pages = val; | |
123 | struct cma *cma = data; | |
124 | ||
125 | return cma_alloc_mem(cma, pages); | |
126 | } | |
127 | ||
128 | DEFINE_SIMPLE_ATTRIBUTE(cma_alloc_fops, NULL, cma_alloc_write, "%llu\n"); | |
129 | ||
28b24c1f SL |
130 | static void cma_debugfs_add_one(struct cma *cma, int idx) |
131 | { | |
132 | struct dentry *tmp; | |
133 | char name[16]; | |
134 | int u32s; | |
135 | ||
136 | sprintf(name, "cma-%d", idx); | |
137 | ||
138 | tmp = debugfs_create_dir(name, cma_debugfs_root); | |
139 | ||
26b02a1f SL |
140 | debugfs_create_file("alloc", S_IWUSR, cma_debugfs_root, cma, |
141 | &cma_alloc_fops); | |
142 | ||
8325330b SL |
143 | debugfs_create_file("free", S_IWUSR, cma_debugfs_root, cma, |
144 | &cma_free_fops); | |
145 | ||
28b24c1f SL |
146 | debugfs_create_file("base_pfn", S_IRUGO, tmp, |
147 | &cma->base_pfn, &cma_debugfs_fops); | |
148 | debugfs_create_file("count", S_IRUGO, tmp, | |
149 | &cma->count, &cma_debugfs_fops); | |
150 | debugfs_create_file("order_per_bit", S_IRUGO, tmp, | |
26b02a1f | 151 | &cma->order_per_bit, &cma_debugfs_fops); |
28b24c1f SL |
152 | |
153 | u32s = DIV_ROUND_UP(cma_bitmap_maxno(cma), BITS_PER_BYTE * sizeof(u32)); | |
154 | debugfs_create_u32_array("bitmap", S_IRUGO, tmp, (u32*)cma->bitmap, u32s); | |
155 | } | |
156 | ||
157 | static int __init cma_debugfs_init(void) | |
158 | { | |
159 | int i; | |
160 | ||
161 | cma_debugfs_root = debugfs_create_dir("cma", NULL); | |
162 | if (!cma_debugfs_root) | |
163 | return -ENOMEM; | |
164 | ||
165 | for (i = 0; i < cma_area_count; i++) | |
166 | cma_debugfs_add_one(&cma_areas[i], i); | |
167 | ||
168 | return 0; | |
169 | } | |
170 | late_initcall(cma_debugfs_init); |