| Minchan Kim | 43ca106 | 2021-05-04 18:37:28 -0700 | [diff] [blame] | 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 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); |