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;
30static struct dentry *debugfs_proc;
31static struct list_head procs;
32
33struct debugfs_proc_entry {
34 struct list_head list;
35 struct dentry *proc_dentry;
36 pid_t pid;
37};
38
39#define MAX_DEBUGFS_FILENAME_LEN 32
40
41static int kfd_debugfs_open(struct inode *inode, struct file *file)
42{
43 int (*show)(struct seq_file *, void *) = inode->i_private;
44
45 return single_open(file, show, NULL);
46}
47static int kfd_debugfs_hang_hws_read(struct seq_file *m, void *data)
48{
49 seq_puts(m, s: "echo gpu_id > hang_hws\n");
50 return 0;
51}
52
53static ssize_t kfd_debugfs_hang_hws_write(struct file *file,
54 const char __user *user_buf, size_t size, loff_t *ppos)
55{
56 struct kfd_node *dev;
57 char tmp[16];
58 uint32_t gpu_id;
59 int ret = -EINVAL;
60
61 memset(tmp, 0, 16);
62 if (size >= 16) {
63 pr_err("Invalid input for gpu id.\n");
64 goto out;
65 }
66 if (copy_from_user(to: tmp, from: user_buf, n: size)) {
67 ret = -EFAULT;
68 goto out;
69 }
70 if (kstrtoint(s: tmp, base: 10, res: &gpu_id)) {
71 pr_err("Invalid input for gpu id.\n");
72 goto out;
73 }
74 dev = kfd_device_by_id(gpu_id);
75 if (dev) {
76 kfd_debugfs_hang_hws(dev);
77 ret = size;
78 } else
79 pr_err("Cannot find device %d.\n", gpu_id);
80
81out:
82 return ret;
83}
84
85static const struct file_operations kfd_debugfs_fops = {
86 .owner = THIS_MODULE,
87 .open = kfd_debugfs_open,
88 .read = seq_read,
89 .llseek = seq_lseek,
90 .release = single_release,
91};
92
93static const struct file_operations kfd_debugfs_hang_hws_fops = {
94 .owner = THIS_MODULE,
95 .open = kfd_debugfs_open,
96 .read = seq_read,
97 .write = kfd_debugfs_hang_hws_write,
98 .llseek = seq_lseek,
99 .release = single_release,
100};
101
102void kfd_debugfs_init(void)
103{
104 debugfs_root = debugfs_create_dir(name: "kfd", NULL);
105 debugfs_proc = debugfs_create_dir(name: "proc", parent: debugfs_root);
106 INIT_LIST_HEAD(list: &procs);
107
108 debugfs_create_file("mqds", S_IFREG | 0444, debugfs_root,
109 kfd_debugfs_mqds_by_process, &kfd_debugfs_fops);
110 debugfs_create_file("hqds", S_IFREG | 0444, debugfs_root,
111 kfd_debugfs_hqds_by_device, &kfd_debugfs_fops);
112 debugfs_create_file("rls", S_IFREG | 0444, debugfs_root,
113 kfd_debugfs_rls_by_device, &kfd_debugfs_fops);
114 debugfs_create_file("hang_hws", S_IFREG | 0200, debugfs_root,
115 kfd_debugfs_hang_hws_read, &kfd_debugfs_hang_hws_fops);
116 debugfs_create_file("mem_limit", S_IFREG | 0200, debugfs_root,
117 kfd_debugfs_kfd_mem_limits, &kfd_debugfs_fops);
118}
119
120void kfd_debugfs_fini(void)
121{
122 debugfs_remove_recursive(dentry: debugfs_proc);
123 debugfs_remove_recursive(dentry: debugfs_root);
124}
125
126static ssize_t kfd_debugfs_pasid_read(struct file *file, char __user *buf,
127 size_t count, loff_t *ppos)
128{
129 struct kfd_process_device *pdd = file_inode(f: file)->i_private;
130 char tmp[32];
131 int len;
132
133 len = snprintf(buf: tmp, size: sizeof(tmp), fmt: "%u\n", pdd->pasid);
134
135 return simple_read_from_buffer(to: buf, count, ppos, from: tmp, available: len);
136}
137
138static const struct file_operations kfd_debugfs_pasid_fops = {
139 .owner = THIS_MODULE,
140 .read = kfd_debugfs_pasid_read,
141};
142
143void kfd_debugfs_add_process(struct kfd_process *p)
144{
145 int i;
146 char name[MAX_DEBUGFS_FILENAME_LEN];
147 struct debugfs_proc_entry *entry;
148
149 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
150 if (!entry)
151 return;
152
153 list_add(new: &entry->list, head: &procs);
154 entry->pid = p->lead_thread->pid;
155 snprintf(buf: name, MAX_DEBUGFS_FILENAME_LEN, fmt: "%d",
156 (int)entry->pid);
157 entry->proc_dentry = debugfs_create_dir(name, parent: debugfs_proc);
158
159 /* Create debugfs files for each GPU:
160 * - proc/<pid>/pasid_<gpuid>
161 */
162 for (i = 0; i < p->n_pdds; i++) {
163 struct kfd_process_device *pdd = p->pdds[i];
164
165 snprintf(buf: name, MAX_DEBUGFS_FILENAME_LEN, fmt: "pasid_%u",
166 pdd->dev->id);
167 debugfs_create_file((const char *)name, S_IFREG | 0444,
168 entry->proc_dentry, pdd,
169 &kfd_debugfs_pasid_fops);
170 }
171}
172
173void kfd_debugfs_remove_process(struct kfd_process *p)
174{
175 struct debugfs_proc_entry *entry, *next;
176
177 mutex_lock(&kfd_processes_mutex);
178 list_for_each_entry_safe(entry, next, &procs, list) {
179 if (entry->pid != p->lead_thread->pid)
180 continue;
181
182 debugfs_remove_recursive(dentry: entry->proc_dentry);
183 list_del(entry: &entry->list);
184 kfree(objp: entry);
185 }
186 mutex_unlock(lock: &kfd_processes_mutex);
187}
188

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