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 29 static struct dentry *debugfs_root; 30 31 static 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 } 37 static 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 43 static 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 71 out: 72 return ret; 73 } 74 75 static 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 83 static 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 92 void 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 } 105 106 void kfd_debugfs_fini(void) 107 { 108 debugfs_remove_recursive(debugfs_root); 109 } 110