drivers/gpu/drm/amd/amdkfd/kfd_debugfs.c

   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         struct dentry *ent;
  89
  90         debugfs_root = debugfs_create_dir("kfd", NULL);
  91         if (!debugfs_root || debugfs_root == ERR_PTR(-ENODEV)) {
  92                 pr_warn("Failed to create kfd debugfs dir\n");
  93                 return;
  94         }
  95
  96         ent = debugfs_create_file("mqds", S_IFREG | 0444, debugfs_root,
  97                                   kfd_debugfs_mqds_by_process,
  98                                   &kfd_debugfs_fops);
  99         if (!ent)
 100                 pr_warn("Failed to create mqds in kfd debugfs\n");
 101
 102         ent = debugfs_create_file("hqds", S_IFREG | 0444, debugfs_root,
 103                                   kfd_debugfs_hqds_by_device,
 104                                   &kfd_debugfs_fops);
 105         if (!ent)
 106                 pr_warn("Failed to create hqds in kfd debugfs\n");
 107
 108         ent = debugfs_create_file("rls", S_IFREG | 0444, debugfs_root,
 109                                   kfd_debugfs_rls_by_device,
 110                                   &kfd_debugfs_fops);
 111
 112         ent = debugfs_create_file("hang_hws", S_IFREG | 0644, debugfs_root,
 113                                   NULL,
 114                                   &kfd_debugfs_hang_hws_fops);
 115
 116         if (!ent)
 117                 pr_warn("Failed to create rls in kfd debugfs\n");
 118 }
 119
 120 void kfd_debugfs_fini(void)
 121 {
 122         debugfs_remove_recursive(debugfs_root);
 123 }