drm/msms/dp: fixed link clock divider bits be over written in BPC unknown case
[platform/kernel/linux-starfive.git] / mm / cma_sysfs.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * CMA SysFS Interface
4  *
5  * Copyright (c) 2021 Minchan Kim <minchan@kernel.org>
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
17 void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages)
18 {
19         atomic64_add(nr_pages, &cma->nr_pages_succeeded);
20 }
21
22 void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages)
23 {
24         atomic64_add(nr_pages, &cma->nr_pages_failed);
25 }
26
27 static inline struct cma *cma_from_kobj(struct kobject *kobj)
28 {
29         return container_of(kobj, struct cma_kobject, kobj)->cma;
30 }
31
32 static ssize_t alloc_pages_success_show(struct kobject *kobj,
33                                         struct kobj_attribute *attr, char *buf)
34 {
35         struct cma *cma = cma_from_kobj(kobj);
36
37         return sysfs_emit(buf, "%llu\n",
38                           atomic64_read(&cma->nr_pages_succeeded));
39 }
40 CMA_ATTR_RO(alloc_pages_success);
41
42 static ssize_t alloc_pages_fail_show(struct kobject *kobj,
43                                      struct kobj_attribute *attr, char *buf)
44 {
45         struct cma *cma = cma_from_kobj(kobj);
46
47         return sysfs_emit(buf, "%llu\n", atomic64_read(&cma->nr_pages_failed));
48 }
49 CMA_ATTR_RO(alloc_pages_fail);
50
51 static void cma_kobj_release(struct kobject *kobj)
52 {
53         struct cma *cma = cma_from_kobj(kobj);
54         struct cma_kobject *cma_kobj = cma->cma_kobj;
55
56         kfree(cma_kobj);
57         cma->cma_kobj = NULL;
58 }
59
60 static struct attribute *cma_attrs[] = {
61         &alloc_pages_success_attr.attr,
62         &alloc_pages_fail_attr.attr,
63         NULL,
64 };
65 ATTRIBUTE_GROUPS(cma);
66
67 static const struct kobj_type cma_ktype = {
68         .release = cma_kobj_release,
69         .sysfs_ops = &kobj_sysfs_ops,
70         .default_groups = cma_groups,
71 };
72
73 static int __init cma_sysfs_init(void)
74 {
75         struct kobject *cma_kobj_root;
76         struct cma_kobject *cma_kobj;
77         struct cma *cma;
78         int i, err;
79
80         cma_kobj_root = kobject_create_and_add("cma", mm_kobj);
81         if (!cma_kobj_root)
82                 return -ENOMEM;
83
84         for (i = 0; i < cma_area_count; i++) {
85                 cma_kobj = kzalloc(sizeof(*cma_kobj), GFP_KERNEL);
86                 if (!cma_kobj) {
87                         err = -ENOMEM;
88                         goto out;
89                 }
90
91                 cma = &cma_areas[i];
92                 cma->cma_kobj = cma_kobj;
93                 cma_kobj->cma = cma;
94                 err = kobject_init_and_add(&cma_kobj->kobj, &cma_ktype,
95                                            cma_kobj_root, "%s", cma->name);
96                 if (err) {
97                         kobject_put(&cma_kobj->kobj);
98                         goto out;
99                 }
100         }
101
102         return 0;
103 out:
104         while (--i >= 0) {
105                 cma = &cma_areas[i];
106                 kobject_put(&cma->cma_kobj->kobj);
107         }
108         kobject_put(cma_kobj_root);
109
110         return err;
111 }
112 subsys_initcall(cma_sysfs_init);