// 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);} void cma_sysfs_account_release_pages(struct cma *cma, unsigned long nr_pages){	atomic64_add(nr_pages, &cma->nr_pages_released);} 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 ssize_t release_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_released));}CMA_ATTR_RO(release_pages_success); static ssize_t total_pages_show(struct kobject *kobj,					  struct kobj_attribute *attr, char *buf){	struct cma *cma = cma_from_kobj(kobj); 	return sysfs_emit(buf, "%lu\n", cma->count);}CMA_ATTR_RO(total_pages); static ssize_t available_pages_show(struct kobject *kobj,					  struct kobj_attribute *attr, char *buf){	struct cma *cma = cma_from_kobj(kobj); 	return sysfs_emit(buf, "%lu\n", cma->available_count);}CMA_ATTR_RO(available_pages); 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,	&release_pages_success_attr.attr,	&total_pages_attr.attr,	&available_pages_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 = &cma_areas[i];		if (!test_bit(CMA_ACTIVATED, &cma->flags))			continue; 		cma_kobj = kzalloc_obj(*cma_kobj);		if (!cma_kobj) {			err = -ENOMEM;			goto out;		} 		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];		if (cma->cma_kobj)			kobject_put(&cma->cma_kobj->kobj);	}	kobject_put(cma_kobj_root); 	return err;}subsys_initcall(cma_sysfs_init);