cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

kfd_debugfs.c (3251B)

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