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 37 static ssize_t kfd_debugfs_hang_hws_write(struct file *file, 38 const char __user *user_buf, size_t size, loff_t *ppos) 39 { 40 struct kfd_dev *dev; 41 char tmp[16]; 42 uint32_t gpu_id; 43 int ret = -EINVAL; 44 45 memset(tmp, 0, 16); 46 if (size >= 16) { 47 pr_err("Invalid input for gpu id.\n"); 48 goto out; 49 } 50 if (copy_from_user(tmp, user_buf, size)) { 51 ret = -EFAULT; 52 goto out; 53 } 54 if (kstrtoint(tmp, 10, &gpu_id)) { 55 pr_err("Invalid input for gpu id.\n"); 56 goto out; 57 } 58 dev = kfd_device_by_id(gpu_id); 59 if (dev) { 60 kfd_debugfs_hang_hws(dev); 61 ret = size; 62 } else 63 pr_err("Cannot find device %d.\n", gpu_id); 64 65 out: 66 return ret; 67 } 68 69 static const struct file_operations kfd_debugfs_fops = { 70 .owner = THIS_MODULE, 71 .open = kfd_debugfs_open, 72 .read = seq_read, 73 .llseek = seq_lseek, 74 .release = single_release, 75 }; 76 77 static const struct file_operations kfd_debugfs_hang_hws_fops = { 78 .owner = THIS_MODULE, 79 .open = kfd_debugfs_open, 80 .read = seq_read, 81 .write = kfd_debugfs_hang_hws_write, 82 .llseek = seq_lseek, 83 .release = single_release, 84 }; 85 86 void kfd_debugfs_init(void) 87 { 88 debugfs_root = debugfs_create_dir("kfd", NULL); 89 90 debugfs_create_file("mqds", S_IFREG | 0444, debugfs_root, 91 kfd_debugfs_mqds_by_process, &kfd_debugfs_fops); 92 debugfs_create_file("hqds", S_IFREG | 0444, debugfs_root, 93 kfd_debugfs_hqds_by_device, &kfd_debugfs_fops); 94 debugfs_create_file("rls", S_IFREG | 0444, debugfs_root, 95 kfd_debugfs_rls_by_device, &kfd_debugfs_fops); 96 debugfs_create_file("hang_hws", S_IFREG | 0644, debugfs_root, 97 NULL, &kfd_debugfs_hang_hws_fops); 98 } 99 100 void kfd_debugfs_fini(void) 101 { 102 debugfs_remove_recursive(debugfs_root); 103 } 104