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

   1 /*
   2  * Copyright 2014 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/device.h>
  24 #include <linux/export.h>
  25 #include <linux/err.h>
  26 #include <linux/fs.h>
  27 #include <linux/sched.h>
  28 #include <linux/slab.h>
  29 #include <linux/uaccess.h>
  30 #include <linux/compat.h>
  31 #include <uapi/linux/kfd_ioctl.h>
  32 #include <linux/time.h>
  33 #include <linux/mm.h>
  34 #include <linux/uaccess.h>
  35 #include <uapi/asm-generic/mman-common.h>
  36 #include <asm/processor.h>
  37 #include "kfd_priv.h"
  38
  39 static long kfd_ioctl(struct file *, unsigned int, unsigned long);
  40 static int kfd_open(struct inode *, struct file *);
  41
  42 static const char kfd_dev_name[] = "kfd";
  43
  44 static const struct file_operations kfd_fops = {
  45         .owner = THIS_MODULE,
  46         .unlocked_ioctl = kfd_ioctl,
  47         .compat_ioctl = kfd_ioctl,
  48         .open = kfd_open,
  49 };
  50
  51 static int kfd_char_dev_major = -1;
  52 static struct class *kfd_class;
  53 struct device *kfd_device;
  54
  55 int kfd_chardev_init(void)
  56 {
  57         int err = 0;
  58
  59         kfd_char_dev_major = register_chrdev(0, kfd_dev_name, &kfd_fops);
  60         err = kfd_char_dev_major;
  61         if (err < 0)
  62                 goto err_register_chrdev;
  63
  64         kfd_class = class_create(THIS_MODULE, kfd_dev_name);
  65         err = PTR_ERR(kfd_class);
  66         if (IS_ERR(kfd_class))
  67                 goto err_class_create;
  68
  69         kfd_device = device_create(kfd_class, NULL,
  70                                         MKDEV(kfd_char_dev_major, 0),
  71                                         NULL, kfd_dev_name);
  72         err = PTR_ERR(kfd_device);
  73         if (IS_ERR(kfd_device))
  74                 goto err_device_create;
  75
  76         return 0;
  77
  78 err_device_create:
  79         class_destroy(kfd_class);
  80 err_class_create:
  81         unregister_chrdev(kfd_char_dev_major, kfd_dev_name);
  82 err_register_chrdev:
  83         return err;
  84 }
  85
  86 void kfd_chardev_exit(void)
  87 {
  88         device_destroy(kfd_class, MKDEV(kfd_char_dev_major, 0));
  89         class_destroy(kfd_class);
  90         unregister_chrdev(kfd_char_dev_major, kfd_dev_name);
  91 }
  92
  93 struct device *kfd_chardev(void)
  94 {
  95         return kfd_device;
  96 }
  97
  98
  99 static int kfd_open(struct inode *inode, struct file *filep)
 100 {
 101         if (iminor(inode) != 0)
 102                 return -ENODEV;
 103
 104         return 0;
 105 }
 106
 107 static long kfd_ioctl_get_version(struct file *filep, struct kfd_process *p,
 108                                         void __user *arg)
 109 {
 110         return -ENODEV;
 111 }
 112
 113 static long kfd_ioctl_create_queue(struct file *filep, struct kfd_process *p,
 114                                         void __user *arg)
 115 {
 116         return -ENODEV;
 117 }
 118
 119 static int kfd_ioctl_destroy_queue(struct file *filp, struct kfd_process *p,
 120                                         void __user *arg)
 121 {
 122         return -ENODEV;
 123 }
 124
 125 static int kfd_ioctl_update_queue(struct file *filp, struct kfd_process *p,
 126                                         void __user *arg)
 127 {
 128         return -ENODEV;
 129 }
 130
 131 static long kfd_ioctl_set_memory_policy(struct file *filep,
 132                                 struct kfd_process *p, void __user *arg)
 133 {
 134         return -ENODEV;
 135 }
 136
 137 static long kfd_ioctl_get_clock_counters(struct file *filep,
 138                                 struct kfd_process *p, void __user *arg)
 139 {
 140         return -ENODEV;
 141 }
 142
 143
 144 static int kfd_ioctl_get_process_apertures(struct file *filp,
 145                                 struct kfd_process *p, void __user *arg)
 146 {
 147         return -ENODEV;
 148 }
 149
 150 static long kfd_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
 151 {
 152         struct kfd_process *process;
 153         long err = -EINVAL;
 154
 155         dev_dbg(kfd_device,
 156                 "ioctl cmd 0x%x (#%d), arg 0x%lx\n",
 157                 cmd, _IOC_NR(cmd), arg);
 158
 159         /* TODO: add function that retrieves process */
 160         process = NULL;
 161
 162         switch (cmd) {
 163         case KFD_IOC_GET_VERSION:
 164                 err = kfd_ioctl_get_version(filep, process, (void __user *)arg);
 165                 break;
 166         case KFD_IOC_CREATE_QUEUE:
 167                 err = kfd_ioctl_create_queue(filep, process,
 168                                                 (void __user *)arg);
 169                 break;
 170
 171         case KFD_IOC_DESTROY_QUEUE:
 172                 err = kfd_ioctl_destroy_queue(filep, process,
 173                                                 (void __user *)arg);
 174                 break;
 175
 176         case KFD_IOC_SET_MEMORY_POLICY:
 177                 err = kfd_ioctl_set_memory_policy(filep, process,
 178                                                 (void __user *)arg);
 179                 break;
 180
 181         case KFD_IOC_GET_CLOCK_COUNTERS:
 182                 err = kfd_ioctl_get_clock_counters(filep, process,
 183                                                 (void __user *)arg);
 184                 break;
 185
 186         case KFD_IOC_GET_PROCESS_APERTURES:
 187                 err = kfd_ioctl_get_process_apertures(filep, process,
 188                                                 (void __user *)arg);
 189                 break;
 190
 191         case KFD_IOC_UPDATE_QUEUE:
 192                 err = kfd_ioctl_update_queue(filep, process,
 193                                                 (void __user *)arg);
 194                 break;
 195
 196         default:
 197                 dev_err(kfd_device,
 198                         "unknown ioctl cmd 0x%x, arg 0x%lx)\n",
 199                         cmd, arg);
 200                 err = -EINVAL;
 201                 break;
 202         }
 203
 204         if (err < 0)
 205                 dev_err(kfd_device,
 206                         "ioctl error %ld for ioctl cmd 0x%x (#%d)\n",
 207                         err, cmd, _IOC_NR(cmd));
 208
 209         return err;
 210 }