// SPDX-License-Identifier: GPL-2.0
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/*
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* CMA SysFS Interface
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*
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* Copyright (c) 2021 Minchan Kim <minchan@kernel.org>
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*/
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#include <linux/cma.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include "cma.h"
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static bool experimental;
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#define CMA_ATTR_RO(_name) \
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static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
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void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages)
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{
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atomic64_add(nr_pages, &cma->nr_pages_succeeded);
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}
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void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages)
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{
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atomic64_add(nr_pages, &cma->nr_pages_failed);
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}
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static inline struct cma *cma_from_kobj(struct kobject *kobj)
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{
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return container_of(kobj, struct cma_kobject, kobj)->cma;
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}
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static ssize_t alloc_pages_success_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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struct cma *cma = cma_from_kobj(kobj);
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return sysfs_emit(buf, "%llu\n",
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atomic64_read(&cma->nr_pages_succeeded));
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}
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CMA_ATTR_RO(alloc_pages_success);
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static ssize_t alloc_pages_fail_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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struct cma *cma = cma_from_kobj(kobj);
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return sysfs_emit(buf, "%llu\n", atomic64_read(&cma->nr_pages_failed));
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}
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CMA_ATTR_RO(alloc_pages_fail);
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static void cma_kobj_release(struct kobject *kobj)
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{
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struct cma *cma = cma_from_kobj(kobj);
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struct cma_kobject *cma_kobj = cma->cma_kobj;
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kfree(cma_kobj);
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cma->cma_kobj = NULL;
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}
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static struct attribute *cma_attrs[] = {
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&alloc_pages_success_attr.attr,
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&alloc_pages_fail_attr.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(cma);
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static struct kobj_type cma_ktype = {
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.release = cma_kobj_release,
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.sysfs_ops = &kobj_sysfs_ops,
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.default_groups = cma_groups,
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};
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static int __init cma_sysfs_init(void)
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{
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struct kobject *cma_kobj_root;
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struct cma_kobject *cma_kobj;
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struct cma *cma;
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int i, err;
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if (!experimental)
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return 0;
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cma_kobj_root = kobject_create_and_add("cma", mm_kobj);
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if (!cma_kobj_root)
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return -ENOMEM;
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for (i = 0; i < cma_area_count; i++) {
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cma_kobj = kzalloc(sizeof(*cma_kobj), GFP_KERNEL);
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if (!cma_kobj) {
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err = -ENOMEM;
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goto out;
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}
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cma = &cma_areas[i];
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cma->cma_kobj = cma_kobj;
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cma_kobj->cma = cma;
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err = kobject_init_and_add(&cma_kobj->kobj, &cma_ktype,
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cma_kobj_root, "%s", cma->name);
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if (err) {
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kobject_put(&cma_kobj->kobj);
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goto out;
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}
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}
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return 0;
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out:
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while (--i >= 0) {
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cma = &cma_areas[i];
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kobject_put(&cma->cma_kobj->kobj);
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}
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kobject_put(cma_kobj_root);
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return err;
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}
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subsys_initcall(cma_sysfs_init);
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module_param(experimental, bool, 0400);
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