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 <uapi/asm-generic/mman-common.h>
  35 #include <asm/processor.h>
  36 #include "kfd_priv.h"
  37 #include "kfd_device_queue_manager.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         bool is_32bit_user_mode;
 105
 106         if (iminor(inode) != 0)
 107                 return -ENODEV;
 108
 109         is_32bit_user_mode = is_compat_task();
 110
 111         if (is_32bit_user_mode == true) {
 112                 dev_warn(kfd_device,
 113                         "Process %d (32-bit) failed to open /dev/kfd\n"
 114                         "32-bit processes are not supported by amdkfd\n",
 115                         current->pid);
 116                 return -EPERM;
 117         }
 118
 119         process = kfd_create_process(current);
 120         if (IS_ERR(process))
 121                 return PTR_ERR(process);
 122
 123         dev_dbg(kfd_device, "process %d opened, compat mode (32 bit) - %d\n",
 124                 process->pasid, process->is_32bit_user_mode);
 125
 126         return 0;
 127 }
 128
 129 static int kfd_ioctl_get_version(struct file *filep, struct kfd_process *p,
 130                                         void *data)
 131 {
 132         struct kfd_ioctl_get_version_args *args = data;
 133         int err = 0;
 134
 135         args->major_version = KFD_IOCTL_MAJOR_VERSION;
 136         args->minor_version = KFD_IOCTL_MINOR_VERSION;
 137
 138         return err;
 139 }
 140
 141 static int set_queue_properties_from_user(struct queue_properties *q_properties,
 142                                 struct kfd_ioctl_create_queue_args *args)
 143 {
 144         if (args->queue_percentage > KFD_MAX_QUEUE_PERCENTAGE) {
 145                 pr_err("kfd: queue percentage must be between 0 to KFD_MAX_QUEUE_PERCENTAGE\n");
 146                 return -EINVAL;
 147         }
 148
 149         if (args->queue_priority > KFD_MAX_QUEUE_PRIORITY) {
 150                 pr_err("kfd: queue priority must be between 0 to KFD_MAX_QUEUE_PRIORITY\n");
 151                 return -EINVAL;
 152         }
 153
 154         if ((args->ring_base_address) &&
 155                 (!access_ok(VERIFY_WRITE,
 156                         (const void __user *) args->ring_base_address,
 157                         sizeof(uint64_t)))) {
 158                 pr_err("kfd: can't access ring base address\n");
 159                 return -EFAULT;
 160         }
 161
 162         if (!is_power_of_2(args->ring_size) && (args->ring_size != 0)) {
 163                 pr_err("kfd: ring size must be a power of 2 or 0\n");
 164                 return -EINVAL;
 165         }
 166
 167         if (!access_ok(VERIFY_WRITE,
 168                         (const void __user *) args->read_pointer_address,
 169                         sizeof(uint32_t))) {
 170                 pr_err("kfd: can't access read pointer\n");
 171                 return -EFAULT;
 172         }
 173
 174         if (!access_ok(VERIFY_WRITE,
 175                         (const void __user *) args->write_pointer_address,
 176                         sizeof(uint32_t))) {
 177                 pr_err("kfd: can't access write pointer\n");
 178                 return -EFAULT;
 179         }
 180
 181         if (args->eop_buffer_address &&
 182                 !access_ok(VERIFY_WRITE,
 183                         (const void __user *) args->eop_buffer_address,
 184                         sizeof(uint32_t))) {
 185                 pr_debug("kfd: can't access eop buffer");
 186                 return -EFAULT;
 187         }
 188
 189         if (args->ctx_save_restore_address &&
 190                 !access_ok(VERIFY_WRITE,
 191                         (const void __user *) args->ctx_save_restore_address,
 192                         sizeof(uint32_t))) {
 193                 pr_debug("kfd: can't access ctx save restore buffer");
 194                 return -EFAULT;
 195         }
 196
 197         q_properties->is_interop = false;
 198         q_properties->queue_percent = args->queue_percentage;
 199         q_properties->priority = args->queue_priority;
 200         q_properties->queue_address = args->ring_base_address;
 201         q_properties->queue_size = args->ring_size;
 202         q_properties->read_ptr = (uint32_t *) args->read_pointer_address;
 203         q_properties->write_ptr = (uint32_t *) args->write_pointer_address;
 204         q_properties->eop_ring_buffer_address = args->eop_buffer_address;
 205         q_properties->eop_ring_buffer_size = args->eop_buffer_size;
 206         q_properties->ctx_save_restore_area_address =
 207                         args->ctx_save_restore_address;
 208         q_properties->ctx_save_restore_area_size = args->ctx_save_restore_size;
 209         if (args->queue_type == KFD_IOC_QUEUE_TYPE_COMPUTE ||
 210                 args->queue_type == KFD_IOC_QUEUE_TYPE_COMPUTE_AQL)
 211                 q_properties->type = KFD_QUEUE_TYPE_COMPUTE;
 212         else if (args->queue_type == KFD_IOC_QUEUE_TYPE_SDMA)
 213                 q_properties->type = KFD_QUEUE_TYPE_SDMA;
 214         else
 215                 return -ENOTSUPP;
 216
 217         if (args->queue_type == KFD_IOC_QUEUE_TYPE_COMPUTE_AQL)
 218                 q_properties->format = KFD_QUEUE_FORMAT_AQL;
 219         else
 220                 q_properties->format = KFD_QUEUE_FORMAT_PM4;
 221
 222         pr_debug("Queue Percentage (%d, %d)\n",
 223                         q_properties->queue_percent, args->queue_percentage);
 224
 225         pr_debug("Queue Priority (%d, %d)\n",
 226                         q_properties->priority, args->queue_priority);
 227
 228         pr_debug("Queue Address (0x%llX, 0x%llX)\n",
 229                         q_properties->queue_address, args->ring_base_address);
 230
 231         pr_debug("Queue Size (0x%llX, %u)\n",
 232                         q_properties->queue_size, args->ring_size);
 233
 234         pr_debug("Queue r/w Pointers (0x%llX, 0x%llX)\n",
 235                         (uint64_t) q_properties->read_ptr,
 236                         (uint64_t) q_properties->write_ptr);
 237
 238         pr_debug("Queue Format (%d)\n", q_properties->format);
 239
 240         pr_debug("Queue EOP (0x%llX)\n", q_properties->eop_ring_buffer_address);
 241
 242         pr_debug("Queue CTX save arex (0x%llX)\n",
 243                         q_properties->ctx_save_restore_area_address);
 244
 245         return 0;
 246 }
 247
 248 static int kfd_ioctl_create_queue(struct file *filep, struct kfd_process *p,
 249                                         void *data)
 250 {
 251         struct kfd_ioctl_create_queue_args *args = data;
 252         struct kfd_dev *dev;
 253         int err = 0;
 254         unsigned int queue_id;
 255         struct kfd_process_device *pdd;
 256         struct queue_properties q_properties;
 257
 258         memset(&q_properties, 0, sizeof(struct queue_properties));
 259
 260         pr_debug("kfd: creating queue ioctl\n");
 261
 262         err = set_queue_properties_from_user(&q_properties, args);
 263         if (err)
 264                 return err;
 265
 266         pr_debug("kfd: looking for gpu id 0x%x\n", args->gpu_id);
 267         dev = kfd_device_by_id(args->gpu_id);
 268         if (dev == NULL) {
 269                 pr_debug("kfd: gpu id 0x%x was not found\n", args->gpu_id);
 270                 return -EINVAL;
 271         }
 272
 273         mutex_lock(&p->mutex);
 274
 275         pdd = kfd_bind_process_to_device(dev, p);
 276         if (IS_ERR(pdd)) {
 277                 err = -ESRCH;
 278                 goto err_bind_process;
 279         }
 280
 281         pr_debug("kfd: creating queue for PASID %d on GPU 0x%x\n",
 282                         p->pasid,
 283                         dev->id);
 284
 285         err = pqm_create_queue(&p->pqm, dev, filep, &q_properties,
 286                                 0, q_properties.type, &queue_id);
 287         if (err != 0)
 288                 goto err_create_queue;
 289
 290         args->queue_id = queue_id;
 291
 292         /* Return gpu_id as doorbell offset for mmap usage */
 293         args->doorbell_offset = args->gpu_id << PAGE_SHIFT;
 294
 295         mutex_unlock(&p->mutex);
 296
 297         pr_debug("kfd: queue id %d was created successfully\n", args->queue_id);
 298
 299         pr_debug("ring buffer address == 0x%016llX\n",
 300                         args->ring_base_address);
 301
 302         pr_debug("read ptr address    == 0x%016llX\n",
 303                         args->read_pointer_address);
 304
 305         pr_debug("write ptr address   == 0x%016llX\n",
 306                         args->write_pointer_address);
 307
 308         return 0;
 309
 310 err_create_queue:
 311 err_bind_process:
 312         mutex_unlock(&p->mutex);
 313         return err;
 314 }
 315
 316 static int kfd_ioctl_destroy_queue(struct file *filp, struct kfd_process *p,
 317                                         void *data)
 318 {
 319         int retval;
 320         struct kfd_ioctl_destroy_queue_args *args = data;
 321
 322         pr_debug("kfd: destroying queue id %d for PASID %d\n",
 323                                 args->queue_id,
 324                                 p->pasid);
 325
 326         mutex_lock(&p->mutex);
 327
 328         retval = pqm_destroy_queue(&p->pqm, args->queue_id);
 329
 330         mutex_unlock(&p->mutex);
 331         return retval;
 332 }
 333
 334 static int kfd_ioctl_update_queue(struct file *filp, struct kfd_process *p,
 335                                         void *data)
 336 {
 337         int retval;
 338         struct kfd_ioctl_update_queue_args *args = data;
 339         struct queue_properties properties;
 340
 341         if (args->queue_percentage > KFD_MAX_QUEUE_PERCENTAGE) {
 342                 pr_err("kfd: queue percentage must be between 0 to KFD_MAX_QUEUE_PERCENTAGE\n");
 343                 return -EINVAL;
 344         }
 345
 346         if (args->queue_priority > KFD_MAX_QUEUE_PRIORITY) {
 347                 pr_err("kfd: queue priority must be between 0 to KFD_MAX_QUEUE_PRIORITY\n");
 348                 return -EINVAL;
 349         }
 350
 351         if ((args->ring_base_address) &&
 352                 (!access_ok(VERIFY_WRITE,
 353                         (const void __user *) args->ring_base_address,
 354                         sizeof(uint64_t)))) {
 355                 pr_err("kfd: can't access ring base address\n");
 356                 return -EFAULT;
 357         }
 358
 359         if (!is_power_of_2(args->ring_size) && (args->ring_size != 0)) {
 360                 pr_err("kfd: ring size must be a power of 2 or 0\n");
 361                 return -EINVAL;
 362         }
 363
 364         properties.queue_address = args->ring_base_address;
 365         properties.queue_size = args->ring_size;
 366         properties.queue_percent = args->queue_percentage;
 367         properties.priority = args->queue_priority;
 368
 369         pr_debug("kfd: updating queue id %d for PASID %d\n",
 370                         args->queue_id, p->pasid);
 371
 372         mutex_lock(&p->mutex);
 373
 374         retval = pqm_update_queue(&p->pqm, args->queue_id, &properties);
 375
 376         mutex_unlock(&p->mutex);
 377
 378         return retval;
 379 }
 380
 381 static int kfd_ioctl_set_memory_policy(struct file *filep,
 382                                         struct kfd_process *p, void *data)
 383 {
 384         struct kfd_ioctl_set_memory_policy_args *args = data;
 385         struct kfd_dev *dev;
 386         int err = 0;
 387         struct kfd_process_device *pdd;
 388         enum cache_policy default_policy, alternate_policy;
 389
 390         if (args->default_policy != KFD_IOC_CACHE_POLICY_COHERENT
 391             && args->default_policy != KFD_IOC_CACHE_POLICY_NONCOHERENT) {
 392                 return -EINVAL;
 393         }
 394
 395         if (args->alternate_policy != KFD_IOC_CACHE_POLICY_COHERENT
 396             && args->alternate_policy != KFD_IOC_CACHE_POLICY_NONCOHERENT) {
 397                 return -EINVAL;
 398         }
 399
 400         dev = kfd_device_by_id(args->gpu_id);
 401         if (dev == NULL)
 402                 return -EINVAL;
 403
 404         mutex_lock(&p->mutex);
 405
 406         pdd = kfd_bind_process_to_device(dev, p);
 407         if (IS_ERR(pdd)) {
 408                 err = -ESRCH;
 409                 goto out;
 410         }
 411
 412         default_policy = (args->default_policy == KFD_IOC_CACHE_POLICY_COHERENT)
 413                          ? cache_policy_coherent : cache_policy_noncoherent;
 414
 415         alternate_policy =
 416                 (args->alternate_policy == KFD_IOC_CACHE_POLICY_COHERENT)
 417                    ? cache_policy_coherent : cache_policy_noncoherent;
 418
 419         if (!dev->dqm->ops.set_cache_memory_policy(dev->dqm,
 420                                 &pdd->qpd,
 421                                 default_policy,
 422                                 alternate_policy,
 423                                 (void __user *)args->alternate_aperture_base,
 424                                 args->alternate_aperture_size))
 425                 err = -EINVAL;
 426
 427 out:
 428         mutex_unlock(&p->mutex);
 429
 430         return err;
 431 }
 432
 433 static int kfd_ioctl_get_clock_counters(struct file *filep,
 434                                 struct kfd_process *p, void *data)
 435 {
 436         struct kfd_ioctl_get_clock_counters_args *args = data;
 437         struct kfd_dev *dev;
 438         struct timespec64 time;
 439
 440         dev = kfd_device_by_id(args->gpu_id);
 441         if (dev == NULL)
 442                 return -EINVAL;
 443
 444         /* Reading GPU clock counter from KGD */
 445         args->gpu_clock_counter = kfd2kgd->get_gpu_clock_counter(dev->kgd);
 446
 447         /* No access to rdtsc. Using raw monotonic time */
 448         getrawmonotonic64(&time);
 449         args->cpu_clock_counter = (uint64_t)timespec64_to_ns(&time);
 450
 451         get_monotonic_boottime64(&time);
 452         args->system_clock_counter = (uint64_t)timespec64_to_ns(&time);
 453
 454         /* Since the counter is in nano-seconds we use 1GHz frequency */
 455         args->system_clock_freq = 1000000000;
 456
 457         return 0;
 458 }
 459
 460
 461 static int kfd_ioctl_get_process_apertures(struct file *filp,
 462                                 struct kfd_process *p, void *data)
 463 {
 464         struct kfd_ioctl_get_process_apertures_args *args = data;
 465         struct kfd_process_device_apertures *pAperture;
 466         struct kfd_process_device *pdd;
 467
 468         dev_dbg(kfd_device, "get apertures for PASID %d", p->pasid);
 469
 470         args->num_of_nodes = 0;
 471
 472         mutex_lock(&p->mutex);
 473
 474         /*if the process-device list isn't empty*/
 475         if (kfd_has_process_device_data(p)) {
 476                 /* Run over all pdd of the process */
 477                 pdd = kfd_get_first_process_device_data(p);
 478                 do {
 479                         pAperture =
 480                                 &args->process_apertures[args->num_of_nodes];
 481                         pAperture->gpu_id = pdd->dev->id;
 482                         pAperture->lds_base = pdd->lds_base;
 483                         pAperture->lds_limit = pdd->lds_limit;
 484                         pAperture->gpuvm_base = pdd->gpuvm_base;
 485                         pAperture->gpuvm_limit = pdd->gpuvm_limit;
 486                         pAperture->scratch_base = pdd->scratch_base;
 487                         pAperture->scratch_limit = pdd->scratch_limit;
 488
 489                         dev_dbg(kfd_device,
 490                                 "node id %u\n", args->num_of_nodes);
 491                         dev_dbg(kfd_device,
 492                                 "gpu id %u\n", pdd->dev->id);
 493                         dev_dbg(kfd_device,
 494                                 "lds_base %llX\n", pdd->lds_base);
 495                         dev_dbg(kfd_device,
 496                                 "lds_limit %llX\n", pdd->lds_limit);
 497                         dev_dbg(kfd_device,
 498                                 "gpuvm_base %llX\n", pdd->gpuvm_base);
 499                         dev_dbg(kfd_device,
 500                                 "gpuvm_limit %llX\n", pdd->gpuvm_limit);
 501                         dev_dbg(kfd_device,
 502                                 "scratch_base %llX\n", pdd->scratch_base);
 503                         dev_dbg(kfd_device,
 504                                 "scratch_limit %llX\n", pdd->scratch_limit);
 505
 506                         args->num_of_nodes++;
 507                 } while ((pdd = kfd_get_next_process_device_data(p, pdd)) != NULL &&
 508                                 (args->num_of_nodes < NUM_OF_SUPPORTED_GPUS));
 509         }
 510
 511         mutex_unlock(&p->mutex);
 512
 513         return 0;
 514 }
 515
 516 #define AMDKFD_IOCTL_DEF(ioctl, _func, _flags) \
 517         [_IOC_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0, .name = #ioctl}
 518
 519 /** Ioctl table */
 520 static const struct amdkfd_ioctl_desc amdkfd_ioctls[] = {
 521         AMDKFD_IOCTL_DEF(AMDKFD_IOC_GET_VERSION,
 522                         kfd_ioctl_get_version, 0),
 523
 524         AMDKFD_IOCTL_DEF(AMDKFD_IOC_CREATE_QUEUE,
 525                         kfd_ioctl_create_queue, 0),
 526
 527         AMDKFD_IOCTL_DEF(AMDKFD_IOC_DESTROY_QUEUE,
 528                         kfd_ioctl_destroy_queue, 0),
 529
 530         AMDKFD_IOCTL_DEF(AMDKFD_IOC_SET_MEMORY_POLICY,
 531                         kfd_ioctl_set_memory_policy, 0),
 532
 533         AMDKFD_IOCTL_DEF(AMDKFD_IOC_GET_CLOCK_COUNTERS,
 534                         kfd_ioctl_get_clock_counters, 0),
 535
 536         AMDKFD_IOCTL_DEF(AMDKFD_IOC_GET_PROCESS_APERTURES,
 537                         kfd_ioctl_get_process_apertures, 0),
 538
 539         AMDKFD_IOCTL_DEF(AMDKFD_IOC_UPDATE_QUEUE,
 540                         kfd_ioctl_update_queue, 0),
 541 };
 542
 543 #define AMDKFD_CORE_IOCTL_COUNT ARRAY_SIZE(amdkfd_ioctls)
 544
 545 static long kfd_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
 546 {
 547         struct kfd_process *process;
 548         amdkfd_ioctl_t *func;
 549         const struct amdkfd_ioctl_desc *ioctl = NULL;
 550         unsigned int nr = _IOC_NR(cmd);
 551         char stack_kdata[128];
 552         char *kdata = NULL;
 553         unsigned int usize, asize;
 554         int retcode = -EINVAL;
 555
 556         if (nr >= AMDKFD_CORE_IOCTL_COUNT)
 557                 goto err_i1;
 558
 559         if ((nr >= AMDKFD_COMMAND_START) && (nr < AMDKFD_COMMAND_END)) {
 560                 u32 amdkfd_size;
 561
 562                 ioctl = &amdkfd_ioctls[nr];
 563
 564                 amdkfd_size = _IOC_SIZE(ioctl->cmd);
 565                 usize = asize = _IOC_SIZE(cmd);
 566                 if (amdkfd_size > asize)
 567                         asize = amdkfd_size;
 568
 569                 cmd = ioctl->cmd;
 570         } else
 571                 goto err_i1;
 572
 573         dev_dbg(kfd_device, "ioctl cmd 0x%x (#%d), arg 0x%lx\n", cmd, nr, arg);
 574
 575         process = kfd_get_process(current);
 576         if (IS_ERR(process)) {
 577                 dev_dbg(kfd_device, "no process\n");
 578                 goto err_i1;
 579         }
 580
 581         /* Do not trust userspace, use our own definition */
 582         func = ioctl->func;
 583
 584         if (unlikely(!func)) {
 585                 dev_dbg(kfd_device, "no function\n");
 586                 retcode = -EINVAL;
 587                 goto err_i1;
 588         }
 589
 590         if (cmd & (IOC_IN | IOC_OUT)) {
 591                 if (asize <= sizeof(stack_kdata)) {
 592                         kdata = stack_kdata;
 593                 } else {
 594                         kdata = kmalloc(asize, GFP_KERNEL);
 595                         if (!kdata) {
 596                                 retcode = -ENOMEM;
 597                                 goto err_i1;
 598                         }
 599                 }
 600                 if (asize > usize)
 601                         memset(kdata + usize, 0, asize - usize);
 602         }
 603
 604         if (cmd & IOC_IN) {
 605                 if (copy_from_user(kdata, (void __user *)arg, usize) != 0) {
 606                         retcode = -EFAULT;
 607                         goto err_i1;
 608                 }
 609         } else if (cmd & IOC_OUT) {
 610                 memset(kdata, 0, usize);
 611         }
 612
 613         retcode = func(filep, process, kdata);
 614
 615         if (cmd & IOC_OUT)
 616                 if (copy_to_user((void __user *)arg, kdata, usize) != 0)
 617                         retcode = -EFAULT;
 618
 619 err_i1:
 620         if (!ioctl)
 621                 dev_dbg(kfd_device, "invalid ioctl: pid=%d, cmd=0x%02x, nr=0x%02x\n",
 622                           task_pid_nr(current), cmd, nr);
 623
 624         if (kdata != stack_kdata)
 625                 kfree(kdata);
 626
 627         if (retcode)
 628                 dev_dbg(kfd_device, "ret = %d\n", retcode);
 629
 630         return retcode;
 631 }
 632
 633 static int kfd_mmap(struct file *filp, struct vm_area_struct *vma)
 634 {
 635         struct kfd_process *process;
 636
 637         process = kfd_get_process(current);
 638         if (IS_ERR(process))
 639                 return PTR_ERR(process);
 640
 641         return kfd_doorbell_mmap(process, vma);
 642 }