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 static int kfd_mmap(struct file *, struct vm_area_struct *);
  42
  43 static const char kfd_dev_name[] = "kfd";
  44
  45 static const struct file_operations kfd_fops = {
  46         .owner = THIS_MODULE,
  47         .unlocked_ioctl = kfd_ioctl,
  48         .compat_ioctl = kfd_ioctl,
  49         .open = kfd_open,
  50         .mmap = kfd_mmap,
  51 };
  52
  53 static int kfd_char_dev_major = -1;
  54 static struct class *kfd_class;
  55 struct device *kfd_device;
  56
  57 int kfd_chardev_init(void)
  58 {
  59         int err = 0;
  60
  61         kfd_char_dev_major = register_chrdev(0, kfd_dev_name, &kfd_fops);
  62         err = kfd_char_dev_major;
  63         if (err < 0)
  64                 goto err_register_chrdev;
  65
  66         kfd_class = class_create(THIS_MODULE, kfd_dev_name);
  67         err = PTR_ERR(kfd_class);
  68         if (IS_ERR(kfd_class))
  69                 goto err_class_create;
  70
  71         kfd_device = device_create(kfd_class, NULL,
  72                                         MKDEV(kfd_char_dev_major, 0),
  73                                         NULL, kfd_dev_name);
  74         err = PTR_ERR(kfd_device);
  75         if (IS_ERR(kfd_device))
  76                 goto err_device_create;
  77
  78         return 0;
  79
  80 err_device_create:
  81         class_destroy(kfd_class);
  82 err_class_create:
  83         unregister_chrdev(kfd_char_dev_major, kfd_dev_name);
  84 err_register_chrdev:
  85         return err;
  86 }
  87
  88 void kfd_chardev_exit(void)
  89 {
  90         device_destroy(kfd_class, MKDEV(kfd_char_dev_major, 0));
  91         class_destroy(kfd_class);
  92         unregister_chrdev(kfd_char_dev_major, kfd_dev_name);
  93 }
  94
  95 struct device *kfd_chardev(void)
  96 {
  97         return kfd_device;
  98 }
  99
 100
 101 static int kfd_open(struct inode *inode, struct file *filep)
 102 {
 103         struct kfd_process *process;
 104
 105         if (iminor(inode) != 0)
 106                 return -ENODEV;
 107
 108         process = kfd_create_process(current);
 109         if (IS_ERR(process))
 110                 return PTR_ERR(process);
 111
 112         process->is_32bit_user_mode = is_compat_task();
 113
 114         dev_dbg(kfd_device, "process %d opened, compat mode (32 bit) - %d\n",
 115                 process->pasid, process->is_32bit_user_mode);
 116
 117         kfd_init_apertures(process);
 118
 119         return 0;
 120 }
 121
 122 static long kfd_ioctl_get_version(struct file *filep, struct kfd_process *p,
 123                                         void __user *arg)
 124 {
 125         return -ENODEV;
 126 }
 127
 128 static long kfd_ioctl_create_queue(struct file *filep, struct kfd_process *p,
 129                                         void __user *arg)
 130 {
 131         return -ENODEV;
 132 }
 133
 134 static int kfd_ioctl_destroy_queue(struct file *filp, struct kfd_process *p,
 135                                         void __user *arg)
 136 {
 137         return -ENODEV;
 138 }
 139
 140 static int kfd_ioctl_update_queue(struct file *filp, struct kfd_process *p,
 141                                         void __user *arg)
 142 {
 143         return -ENODEV;
 144 }
 145
 146 static long kfd_ioctl_set_memory_policy(struct file *filep,
 147                                 struct kfd_process *p, void __user *arg)
 148 {
 149         return -ENODEV;
 150 }
 151
 152 static long kfd_ioctl_get_clock_counters(struct file *filep,
 153                                 struct kfd_process *p, void __user *arg)
 154 {
 155         return -ENODEV;
 156 }
 157
 158
 159 static int kfd_ioctl_get_process_apertures(struct file *filp,
 160                                 struct kfd_process *p, void __user *arg)
 161 {
 162         return -ENODEV;
 163 }
 164
 165 static long kfd_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
 166 {
 167         struct kfd_process *process;
 168         long err = -EINVAL;
 169
 170         dev_dbg(kfd_device,
 171                 "ioctl cmd 0x%x (#%d), arg 0x%lx\n",
 172                 cmd, _IOC_NR(cmd), arg);
 173
 174         process = kfd_get_process(current);
 175         if (IS_ERR(process))
 176                 return PTR_ERR(process);
 177
 178         switch (cmd) {
 179         case KFD_IOC_GET_VERSION:
 180                 err = kfd_ioctl_get_version(filep, process, (void __user *)arg);
 181                 break;
 182         case KFD_IOC_CREATE_QUEUE:
 183                 err = kfd_ioctl_create_queue(filep, process,
 184                                                 (void __user *)arg);
 185                 break;
 186
 187         case KFD_IOC_DESTROY_QUEUE:
 188                 err = kfd_ioctl_destroy_queue(filep, process,
 189                                                 (void __user *)arg);
 190                 break;
 191
 192         case KFD_IOC_SET_MEMORY_POLICY:
 193                 err = kfd_ioctl_set_memory_policy(filep, process,
 194                                                 (void __user *)arg);
 195                 break;
 196
 197         case KFD_IOC_GET_CLOCK_COUNTERS:
 198                 err = kfd_ioctl_get_clock_counters(filep, process,
 199                                                 (void __user *)arg);
 200                 break;
 201
 202         case KFD_IOC_GET_PROCESS_APERTURES:
 203                 err = kfd_ioctl_get_process_apertures(filep, process,
 204                                                 (void __user *)arg);
 205                 break;
 206
 207         case KFD_IOC_UPDATE_QUEUE:
 208                 err = kfd_ioctl_update_queue(filep, process,
 209                                                 (void __user *)arg);
 210                 break;
 211
 212         default:
 213                 dev_err(kfd_device,
 214                         "unknown ioctl cmd 0x%x, arg 0x%lx)\n",
 215                         cmd, arg);
 216                 err = -EINVAL;
 217                 break;
 218         }
 219
 220         if (err < 0)
 221                 dev_err(kfd_device,
 222                         "ioctl error %ld for ioctl cmd 0x%x (#%d)\n",
 223                         err, cmd, _IOC_NR(cmd));
 224
 225         return err;
 226 }
 227
 228 static int kfd_mmap(struct file *filp, struct vm_area_struct *vma)
 229 {
 230         struct kfd_process *process;
 231
 232         process = kfd_get_process(current);
 233         if (IS_ERR(process))
 234                 return PTR_ERR(process);
 235
 236         return kfd_doorbell_mmap(process, vma);
 237 }