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1// SPDX-License-Identifier: GPL-2.02/*3 * CMA SysFS Interface4 *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 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 void cma_kobj_release(struct kobject *kobj)66{67 struct cma *cma = cma_from_kobj(kobj);68 struct cma_kobject *cma_kobj = cma->cma_kobj;69 70 kfree(cma_kobj);71 cma->cma_kobj = NULL;72}73 74static struct attribute *cma_attrs[] = {75 &alloc_pages_success_attr.attr,76 &alloc_pages_fail_attr.attr,77 &release_pages_success_attr.attr,78 NULL,79};80ATTRIBUTE_GROUPS(cma);81 82static const struct kobj_type cma_ktype = {83 .release = cma_kobj_release,84 .sysfs_ops = &kobj_sysfs_ops,85 .default_groups = cma_groups,86};87 88static int __init cma_sysfs_init(void)89{90 struct kobject *cma_kobj_root;91 struct cma_kobject *cma_kobj;92 struct cma *cma;93 int i, err;94 95 cma_kobj_root = kobject_create_and_add("cma", mm_kobj);96 if (!cma_kobj_root)97 return -ENOMEM;98 99 for (i = 0; i < cma_area_count; i++) {100 cma_kobj = kzalloc(sizeof(*cma_kobj), GFP_KERNEL);101 if (!cma_kobj) {102 err = -ENOMEM;103 goto out;104 }105 106 cma = &cma_areas[i];107 cma->cma_kobj = cma_kobj;108 cma_kobj->cma = cma;109 err = kobject_init_and_add(&cma_kobj->kobj, &cma_ktype,110 cma_kobj_root, "%s", cma->name);111 if (err) {112 kobject_put(&cma_kobj->kobj);113 goto out;114 }115 }116 117 return 0;118out:119 while (--i >= 0) {120 cma = &cma_areas[i];121 kobject_put(&cma->cma_kobj->kobj);122 }123 kobject_put(cma_kobj_root);124 125 return err;126}127subsys_initcall(cma_sysfs_init);128