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      1 /*	$NetBSD: kfd_debugfs.c,v 1.2 2021/12/18 23:44:59 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2016-2017 Advanced Micro Devices, Inc.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included in
     14  * all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     22  * OTHER DEALINGS IN THE SOFTWARE.
     23  */
     24 
     25 #include <sys/cdefs.h>
     26 __KERNEL_RCSID(0, "$NetBSD: kfd_debugfs.c,v 1.2 2021/12/18 23:44:59 riastradh Exp $");
     27 
     28 #include <linux/debugfs.h>
     29 #include <linux/uaccess.h>
     30 
     31 #include "kfd_priv.h"
     32 
     33 static struct dentry *debugfs_root;
     34 
     35 static int kfd_debugfs_open(struct inode *inode, struct file *file)
     36 {
     37 	int (*show)(struct seq_file *, void *) = inode->i_private;
     38 
     39 	return single_open(file, show, NULL);
     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 			    NULL, &kfd_debugfs_hang_hws_fops);
    103 }
    104 
    105 void kfd_debugfs_fini(void)
    106 {
    107 	debugfs_remove_recursive(debugfs_root);
    108 }
    109