| /* |
| * Copyright (c) 2014, 2018 The Linux Foundation. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 and |
| * only version 2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <linux/debugfs.h> |
| #include <linux/fs.h> |
| #include <linux/platform_device.h> |
| #include "vmem.h" |
| |
| struct vmem_debugfs_cookie { |
| phys_addr_t addr; |
| size_t size; |
| }; |
| |
| static int __vmem_alloc_get(void *priv, u64 *val) |
| { |
| struct vmem_debugfs_cookie *cookie = priv; |
| |
| *val = cookie->size; |
| return 0; |
| } |
| |
| static int __vmem_alloc_set(void *priv, u64 val) |
| { |
| struct vmem_debugfs_cookie *cookie = priv; |
| int rc = 0; |
| |
| switch (val) { |
| case 0: /* free */ |
| vmem_free(cookie->addr); |
| cookie->size = 0; |
| break; |
| default: |
| rc = vmem_allocate(val, &cookie->addr); |
| cookie->size = val; |
| break; |
| } |
| |
| return rc; |
| } |
| |
| DEFINE_SIMPLE_ATTRIBUTE(fops_vmem_alloc, __vmem_alloc_get, |
| __vmem_alloc_set, "%llu"); |
| |
| struct dentry *vmem_debugfs_init(struct platform_device *pdev) |
| { |
| struct vmem_debugfs_cookie *alloc_cookie = NULL; |
| struct dentry *debugfs_root = NULL; |
| |
| alloc_cookie = devm_kzalloc(&pdev->dev, sizeof(*alloc_cookie), |
| GFP_KERNEL); |
| if (!alloc_cookie) |
| goto exit; |
| |
| debugfs_root = debugfs_create_dir("vmem", NULL); |
| if (IS_ERR_OR_NULL(debugfs_root)) { |
| pr_warn("Failed to create '<debugfs>/vmem'\n"); |
| debugfs_root = NULL; |
| goto exit; |
| } |
| |
| debugfs_create_file("alloc", 0600, debugfs_root, |
| alloc_cookie, &fops_vmem_alloc); |
| |
| exit: |
| return debugfs_root; |
| } |
| |
| void vmem_debugfs_deinit(struct dentry *debugfs_root) |
| { |
| debugfs_remove_recursive(debugfs_root); |
| } |
| |