// SPDX-License-Identifier: GPL-2.0 /* * CMA SysFS Interface * * Copyright (c) 2021 Minchan Kim <minchan@kernel.org> */ #include <linux/cma.h> #include <linux/kernel.h> #include <linux/slab.h> #include "cma.h" #define CMA_ATTR_RO(_name) \ static struct kobj_attribute _name##_attr = __ATTR_RO(_name) void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages) { atomic64_add(nr_pages, &cma->nr_pages_succeeded); } void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages) { atomic64_add(nr_pages, &cma->nr_pages_failed); } static inline struct cma *cma_from_kobj(struct kobject *kobj) { return container_of(kobj, struct cma_kobject, kobj)->cma; } static ssize_t alloc_pages_success_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct cma *cma = cma_from_kobj(kobj); return sysfs_emit(buf, "%llu\n", atomic64_read(&cma->nr_pages_succeeded)); } CMA_ATTR_RO(alloc_pages_success); static ssize_t alloc_pages_fail_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct cma *cma = cma_from_kobj(kobj); return sysfs_emit(buf, "%llu\n", atomic64_read(&cma->nr_pages_failed)); } CMA_ATTR_RO(alloc_pages_fail); static void cma_kobj_release(struct kobject *kobj) { struct cma *cma = cma_from_kobj(kobj); struct cma_kobject *cma_kobj = cma->cma_kobj; kfree(cma_kobj); cma->cma_kobj = NULL; } static struct attribute *cma_attrs[] = { &alloc_pages_success_attr.attr, &alloc_pages_fail_attr.attr, NULL, }; ATTRIBUTE_GROUPS(cma); static const struct kobj_type cma_ktype = { .release = cma_kobj_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = cma_groups, }; static int __init cma_sysfs_init(void) { struct kobject *cma_kobj_root; struct cma_kobject *cma_kobj; struct cma *cma; int i, err; cma_kobj_root = kobject_create_and_add("cma", mm_kobj); if (!cma_kobj_root) return -ENOMEM; for (i = 0; i < cma_area_count; i++) { cma_kobj = kzalloc(sizeof(*cma_kobj), GFP_KERNEL); if (!cma_kobj) { err = -ENOMEM; goto out; } cma = &cma_areas[i]; cma->cma_kobj = cma_kobj; cma_kobj->cma = cma; err = kobject_init_and_add(&cma_kobj->kobj, &cma_ktype, cma_kobj_root, "%s", cma->name); if (err) { kobject_put(&cma_kobj->kobj); goto out; } } return 0; out: while (--i >= 0) { cma = &cma_areas[i]; kobject_put(&cma->cma_kobj->kobj); } kobject_put(cma_kobj_root); return err; } subsys_initcall(cma_sysfs_init);