LXR linux/drivers/gpu/drm/amd/amdkfd/kfd

   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
  28static struct dentry *debugfs_root;
  29
  30static 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}
  36static int kfd_debugfs_hang_hws_read(struct seq_file *m, void *data)
  37{
  38        seq_printf(m, "echo gpu_id > hang_hws\n");
  39        return 0;
  40}
  41
  42static 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
  70out:
  71        return ret;
  72}
  73
  74static 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
  82static 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
  91void 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                            kfd_debugfs_hang_hws_read, &kfd_debugfs_hang_hws_fops);
 103}
 104
 105void kfd_debugfs_fini(void)
 106{
 107        debugfs_remove_recursive(debugfs_root);
 108}
 109