1// SPDX-License-Identifier: GPL-2.0 OR MIT
2/*
3 * Copyright 2016-2022 Advanced Micro Devices, Inc.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
21 * OTHER DEALINGS IN THE SOFTWARE.
22 */
23
24#include <linux/debugfs.h>
25#include <linux/uaccess.h>
26
27#include "kfd_priv.h"
28
29static struct dentry *debugfs_root;
30
31static int kfd_debugfs_open(struct inode *inode, struct file *file)
32{
33 int (*show)(struct seq_file *, void *) = inode->i_private;
34
35 return single_open(file, show, NULL);
36}
37static int kfd_debugfs_hang_hws_read(struct seq_file *m, void *data)
38{
39 seq_puts(m, "echo gpu_id > hang_hws\n");
40 return 0;
41}
42
43static ssize_t kfd_debugfs_hang_hws_write(struct file *file,
44 const char __user *user_buf, size_t size, loff_t *ppos)
45{
46 struct kfd_dev *dev;
47 char tmp[16];
48 uint32_t gpu_id;
49 int ret = -EINVAL;
50
51 memset(tmp, 0, 16);
52 if (size >= 16) {
53 pr_err("Invalid input for gpu id.\n");
54 goto out;
55 }
56 if (copy_from_user(tmp, user_buf, size)) {
57 ret = -EFAULT;
58 goto out;
59 }
60 if (kstrtoint(tmp, 10, &gpu_id)) {
61 pr_err("Invalid input for gpu id.\n");
62 goto out;
63 }
64 dev = kfd_device_by_id(gpu_id);
65 if (dev) {
66 kfd_debugfs_hang_hws(dev);
67 ret = size;
68 } else
69 pr_err("Cannot find device %d.\n", gpu_id);
70
71out:
72 return ret;
73}
74
75static const struct file_operations kfd_debugfs_fops = {
76 .owner = THIS_MODULE,
77 .open = kfd_debugfs_open,
78 .read = seq_read,
79 .llseek = seq_lseek,
80 .release = single_release,
81};
82
83static const struct file_operations kfd_debugfs_hang_hws_fops = {
84 .owner = THIS_MODULE,
85 .open = kfd_debugfs_open,
86 .read = seq_read,
87 .write = kfd_debugfs_hang_hws_write,
88 .llseek = seq_lseek,
89 .release = single_release,
90};
91
92void kfd_debugfs_init(void)
93{
94 debugfs_root = debugfs_create_dir("kfd", NULL);
95
96 debugfs_create_file("mqds", S_IFREG | 0444, debugfs_root,
97 kfd_debugfs_mqds_by_process, &kfd_debugfs_fops);
98 debugfs_create_file("hqds", S_IFREG | 0444, debugfs_root,
99 kfd_debugfs_hqds_by_device, &kfd_debugfs_fops);
100 debugfs_create_file("rls", S_IFREG | 0444, debugfs_root,
101 kfd_debugfs_rls_by_device, &kfd_debugfs_fops);
102 debugfs_create_file("hang_hws", S_IFREG | 0200, debugfs_root,
103 kfd_debugfs_hang_hws_read, &kfd_debugfs_hang_hws_fops);
104 debugfs_create_file("mem_limit", S_IFREG | 0200, debugfs_root,
105 kfd_debugfs_kfd_mem_limits, &kfd_debugfs_fops);
106}
107
108void kfd_debugfs_fini(void)
109{
110 debugfs_remove_recursive(debugfs_root);
111}
112

source code of linux/drivers/gpu/drm/amd/amdkfd/kfd_debugfs.c