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151 lines · 3.4 KiB

1// SPDX-License-Identifier: GPL-2.0
2/*
3 * CMA SysFS Interface
4 *
5 * Copyright (c) 2021 Minchan Kim <[email protected]>
6 */
7
8#include <linux/cma.h>
9#include <linux/kernel.h>
10#include <linux/slab.h>
11
12#include "cma.h"
13
14#define CMA_ATTR_RO(_name) \
15 static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
16
17void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages)
18{
19 atomic64_add(nr_pages, &cma->nr_pages_succeeded);
20}
21
22void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages)
23{
24 atomic64_add(nr_pages, &cma->nr_pages_failed);
25}
26
27void cma_sysfs_account_release_pages(struct cma *cma, unsigned long nr_pages)
28{
29 atomic64_add(nr_pages, &cma->nr_pages_released);
30}
31
32static inline struct cma *cma_from_kobj(struct kobject *kobj)
33{
34 return container_of(kobj, struct cma_kobject, kobj)->cma;
35}
36
37static ssize_t alloc_pages_success_show(struct kobject *kobj,
38 struct kobj_attribute *attr, char *buf)
39{
40 struct cma *cma = cma_from_kobj(kobj);
41
42 return sysfs_emit(buf, "%llu\n",
43 atomic64_read(&cma->nr_pages_succeeded));
44}
45CMA_ATTR_RO(alloc_pages_success);
46
47static ssize_t alloc_pages_fail_show(struct kobject *kobj,
48 struct kobj_attribute *attr, char *buf)
49{
50 struct cma *cma = cma_from_kobj(kobj);
51
52 return sysfs_emit(buf, "%llu\n", atomic64_read(&cma->nr_pages_failed));
53}
54CMA_ATTR_RO(alloc_pages_fail);
55
56static ssize_t release_pages_success_show(struct kobject *kobj,
57 struct kobj_attribute *attr, char *buf)
58{
59 struct cma *cma = cma_from_kobj(kobj);
60
61 return sysfs_emit(buf, "%llu\n", atomic64_read(&cma->nr_pages_released));
62}
63CMA_ATTR_RO(release_pages_success);
64
65static ssize_t total_pages_show(struct kobject *kobj,
66 struct kobj_attribute *attr, char *buf)
67{
68 struct cma *cma = cma_from_kobj(kobj);
69
70 return sysfs_emit(buf, "%lu\n", cma->count);
71}
72CMA_ATTR_RO(total_pages);
73
74static ssize_t available_pages_show(struct kobject *kobj,
75 struct kobj_attribute *attr, char *buf)
76{
77 struct cma *cma = cma_from_kobj(kobj);
78
79 return sysfs_emit(buf, "%lu\n", cma->available_count);
80}
81CMA_ATTR_RO(available_pages);
82
83static void cma_kobj_release(struct kobject *kobj)
84{
85 struct cma *cma = cma_from_kobj(kobj);
86 struct cma_kobject *cma_kobj = cma->cma_kobj;
87
88 kfree(cma_kobj);
89 cma->cma_kobj = NULL;
90}
91
92static struct attribute *cma_attrs[] = {
93 &alloc_pages_success_attr.attr,
94 &alloc_pages_fail_attr.attr,
95 &release_pages_success_attr.attr,
96 &total_pages_attr.attr,
97 &available_pages_attr.attr,
98 NULL,
99};
100ATTRIBUTE_GROUPS(cma);
101
102static const struct kobj_type cma_ktype = {
103 .release = cma_kobj_release,
104 .sysfs_ops = &kobj_sysfs_ops,
105 .default_groups = cma_groups,
106};
107
108static int __init cma_sysfs_init(void)
109{
110 struct kobject *cma_kobj_root;
111 struct cma_kobject *cma_kobj;
112 struct cma *cma;
113 int i, err;
114
115 cma_kobj_root = kobject_create_and_add("cma", mm_kobj);
116 if (!cma_kobj_root)
117 return -ENOMEM;
118
119 for (i = 0; i < cma_area_count; i++) {
120 cma = &cma_areas[i];
121 if (!test_bit(CMA_ACTIVATED, &cma->flags))
122 continue;
123
124 cma_kobj = kzalloc_obj(*cma_kobj);
125 if (!cma_kobj) {
126 err = -ENOMEM;
127 goto out;
128 }
129
130 cma->cma_kobj = cma_kobj;
131 cma_kobj->cma = cma;
132 err = kobject_init_and_add(&cma_kobj->kobj, &cma_ktype,
133 cma_kobj_root, "%s", cma->name);
134 if (err) {
135 kobject_put(&cma_kobj->kobj);
136 goto out;
137 }
138 }
139
140 return 0;
141out:
142 while (--i >= 0) {
143 cma = &cma_areas[i];
144 if (cma->cma_kobj)
145 kobject_put(&cma->cma_kobj->kobj);
146 }
147 kobject_put(cma_kobj_root);
148
149 return err;
150}
151subsys_initcall(cma_sysfs_init);