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}
 36static int kfd_debugfs_hang_hws_read(struct seq_file *m, void *data)
 37{
 38	seq_printf(m, "echo gpu_id > hang_hws\n");
 39	return 0;
 40}
 41
 42static ssize_t kfd_debugfs_hang_hws_write(struct file *file,
 43	const char __user *user_buf, size_t size, loff_t *ppos)
 44{
 45	struct kfd_dev *dev;
 46	char tmp[16];
 47	uint32_t gpu_id;
 48	int ret = -EINVAL;
 49
 50	memset(tmp, 0, 16);
 51	if (size >= 16) {
 52		pr_err("Invalid input for gpu id.\n");
 53		goto out;
 54	}
 55	if (copy_from_user(tmp, user_buf, size)) {
 56		ret = -EFAULT;
 57		goto out;
 58	}
 59	if (kstrtoint(tmp, 10, &gpu_id)) {
 60		pr_err("Invalid input for gpu id.\n");
 61		goto out;
 62	}
 63	dev = kfd_device_by_id(gpu_id);
 64	if (dev) {
 65		kfd_debugfs_hang_hws(dev);
 66		ret = size;
 67	} else
 68		pr_err("Cannot find device %d.\n", gpu_id);
 69
 70out:
 71	return ret;
 72}
 73
 74static const struct file_operations kfd_debugfs_fops = {
 75	.owner = THIS_MODULE,
 76	.open = kfd_debugfs_open,
 77	.read = seq_read,
 78	.llseek = seq_lseek,
 79	.release = single_release,
 80};
 81
 82static const struct file_operations kfd_debugfs_hang_hws_fops = {
 83	.owner = THIS_MODULE,
 84	.open = kfd_debugfs_open,
 85	.read = seq_read,
 86	.write = kfd_debugfs_hang_hws_write,
 87	.llseek = seq_lseek,
 88	.release = single_release,
 89};
 90
 91void kfd_debugfs_init(void)
 92{
 93	debugfs_root = debugfs_create_dir("kfd", NULL);
 94
 95	debugfs_create_file("mqds", S_IFREG | 0444, debugfs_root,
 96			    kfd_debugfs_mqds_by_process, &kfd_debugfs_fops);
 97	debugfs_create_file("hqds", S_IFREG | 0444, debugfs_root,
 98			    kfd_debugfs_hqds_by_device, &kfd_debugfs_fops);
 99	debugfs_create_file("rls", S_IFREG | 0444, debugfs_root,
100			    kfd_debugfs_rls_by_device, &kfd_debugfs_fops);
101	debugfs_create_file("hang_hws", S_IFREG | 0200, debugfs_root,
102			    kfd_debugfs_hang_hws_read, &kfd_debugfs_hang_hws_fops);
103}
104
105void kfd_debugfs_fini(void)
106{
107	debugfs_remove_recursive(debugfs_root);
108}