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 
28 static struct dentry *debugfs_root;
29 
30 static 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 static 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 
42 static 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 
70 out:
71 	return ret;
72 }
73 
74 static 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 
82 static 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 
91 void 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 
105 void kfd_debugfs_fini(void)
106 {
107 	debugfs_remove_recursive(debugfs_root);
108 }
109