kfd_debugfs.c

  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, "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(tmp, user_buf, size)) {
 67		ret = -EFAULT;
 68		goto out;
 69	}
 70	if (kstrtoint(tmp, 10, &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("kfd", NULL);
105	debugfs_proc = debugfs_create_dir("proc", debugfs_root);
106	INIT_LIST_HEAD(&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(debugfs_proc);
123	debugfs_remove_recursive(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(file)->i_private;
130	char tmp[32];
131	int len;
132
133	len = snprintf(tmp, sizeof(tmp), "%u\n", pdd->pasid);
134
135	return simple_read_from_buffer(buf, count, ppos, tmp, 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(&entry->list, &procs);
154	entry->pid = p->lead_thread->pid;
155	snprintf(name, MAX_DEBUGFS_FILENAME_LEN, "%d",
156		 (int)entry->pid);
157	entry->proc_dentry = debugfs_create_dir(name, 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(name, MAX_DEBUGFS_FILENAME_LEN, "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(entry->proc_dentry);
183		list_del(&entry->list);
184		kfree(entry);
185	}
186	mutex_unlock(&kfd_processes_mutex);
187}