1/*
  2 * Copyright 2016-2017 Advanced Micro Devices, Inc.
  3 *
  4 * Permission is hereby granted, free of charge, to any person obtaining a
  5 * copy of this software and associated documentation files (the "Software"),
  6 * to deal in the Software without restriction, including without limitation
  7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8 * and/or sell copies of the Software, and to permit persons to whom the
  9 * Software is furnished to do so, subject to the following conditions:
 10 *
 11 * The above copyright notice and this permission notice shall be included in
 12 * all copies or substantial portions of the Software.
 13 *
 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 20 * OTHER DEALINGS IN THE SOFTWARE.
 21 */
 22
 23#include <linux/debugfs.h>
 24#include <linux/uaccess.h>
 25
 26#include "kfd_priv.h"
 27
 28static struct dentry *debugfs_root;
 29
 30static int kfd_debugfs_open(struct inode *inode, struct file *file)
 31{
 32	int (*show)(struct seq_file *, void *) = inode->i_private;
 33
 34	return single_open(file, show, NULL);
 35}
 36
 37static ssize_t kfd_debugfs_hang_hws_write(struct file *file,
 38	const char __user *user_buf, size_t size, loff_t *ppos)
 39{
 40	struct kfd_dev *dev;
 41	char tmp[16];
 42	uint32_t gpu_id;
 43	int ret = -EINVAL;
 44
 45	memset(tmp, 0, 16);
 46	if (size >= 16) {
 47		pr_err("Invalid input for gpu id.\n");
 48		goto out;
 49	}
 50	if (copy_from_user(tmp, user_buf, size)) {
 51		ret = -EFAULT;
 52		goto out;
 53	}
 54	if (kstrtoint(tmp, 10, &gpu_id)) {
 55		pr_err("Invalid input for gpu id.\n");
 56		goto out;
 57	}
 58	dev = kfd_device_by_id(gpu_id);
 59	if (dev) {
 60		kfd_debugfs_hang_hws(dev);
 61		ret = size;
 62	} else
 63		pr_err("Cannot find device %d.\n", gpu_id);
 64
 65out:
 66	return ret;
 67}
 68
 69static const struct file_operations kfd_debugfs_fops = {
 70	.owner = THIS_MODULE,
 71	.open = kfd_debugfs_open,
 72	.read = seq_read,
 73	.llseek = seq_lseek,
 74	.release = single_release,
 75};
 76
 77static const struct file_operations kfd_debugfs_hang_hws_fops = {
 78	.owner = THIS_MODULE,
 79	.open = kfd_debugfs_open,
 80	.read = seq_read,
 81	.write = kfd_debugfs_hang_hws_write,
 82	.llseek = seq_lseek,
 83	.release = single_release,
 84};
 85
 86void kfd_debugfs_init(void)
 87{
 88	debugfs_root = debugfs_create_dir("kfd", NULL);
 89
 90	debugfs_create_file("mqds", S_IFREG | 0444, debugfs_root,
 91			    kfd_debugfs_mqds_by_process, &kfd_debugfs_fops);
 92	debugfs_create_file("hqds", S_IFREG | 0444, debugfs_root,
 93			    kfd_debugfs_hqds_by_device, &kfd_debugfs_fops);
 94	debugfs_create_file("rls", S_IFREG | 0444, debugfs_root,
 95			    kfd_debugfs_rls_by_device, &kfd_debugfs_fops);
 96	debugfs_create_file("hang_hws", S_IFREG | 0644, debugfs_root,
 97			    NULL, &kfd_debugfs_hang_hws_fops);
 98}
 99
100void kfd_debugfs_fini(void)
101{
102	debugfs_remove_recursive(debugfs_root);
103}