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- // SPDX-License-Identifier: GPL-2.0
- /*
- * CMA SysFS Interface
- *
- * Copyright (c) 2021 Minchan Kim <[email protected]>
- */
- #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 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);
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