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
 293         /* Return gpu_id as doorbell offset for mmap usage */
 294         args->doorbell_offset = (KFD_MMAP_DOORBELL_MASK | args->gpu_id);
 295         args->doorbell_offset <<= PAGE_SHIFT;
 296
 297         mutex_unlock(&p->mutex);
 298
 299         pr_debug("kfd: queue id %d was created successfully\n", args->queue_id);
 300
 301         pr_debug("ring buffer address == 0x%016llX\n",
 302                         args->ring_base_address);
 303
 304         pr_debug("read ptr address    == 0x%016llX\n",
 305                         args->read_pointer_address);
 306
 307         pr_debug("write ptr address   == 0x%016llX\n",
 308                         args->write_pointer_address);
 309
 310         return 0;
 311
 312 err_create_queue:
 313 err_bind_process:
 314         mutex_unlock(&p->mutex);
 315         return err;
 316 }
 317
 318 static int kfd_ioctl_destroy_queue(struct file *filp, struct kfd_process *p,
 319                                         void *data)
 320 {
 321         int retval;
 322         struct kfd_ioctl_destroy_queue_args *args = data;
 323
 324         pr_debug("kfd: destroying queue id %d for PASID %d\n",
 325                                 args->queue_id,
 326                                 p->pasid);
 327
 328         mutex_lock(&p->mutex);
 329
 330         retval = pqm_destroy_queue(&p->pqm, args->queue_id);
 331
 332         mutex_unlock(&p->mutex);
 333         return retval;
 334 }
 335
 336 static int kfd_ioctl_update_queue(struct file *filp, struct kfd_process *p,
 337                                         void *data)
 338 {
 339         int retval;
 340         struct kfd_ioctl_update_queue_args *args = data;
 341         struct queue_properties properties;
 342
 343         if (args->queue_percentage > KFD_MAX_QUEUE_PERCENTAGE) {
 344                 pr_err("kfd: queue percentage must be between 0 to KFD_MAX_QUEUE_PERCENTAGE\n");
 345                 return -EINVAL;
 346         }
 347
 348         if (args->queue_priority > KFD_MAX_QUEUE_PRIORITY) {
 349                 pr_err("kfd: queue priority must be between 0 to KFD_MAX_QUEUE_PRIORITY\n");
 350                 return -EINVAL;
 351         }
 352
 353         if ((args->ring_base_address) &&
 354                 (!access_ok(VERIFY_WRITE,
 355                         (const void __user *) args->ring_base_address,
 356                         sizeof(uint64_t)))) {
 357                 pr_err("kfd: can't access ring base address\n");
 358                 return -EFAULT;
 359         }
 360
 361         if (!is_power_of_2(args->ring_size) && (args->ring_size != 0)) {
 362                 pr_err("kfd: ring size must be a power of 2 or 0\n");
 363                 return -EINVAL;
 364         }
 365
 366         properties.queue_address = args->ring_base_address;
 367         properties.queue_size = args->ring_size;
 368         properties.queue_percent = args->queue_percentage;
 369         properties.priority = args->queue_priority;
 370
 371         pr_debug("kfd: updating queue id %d for PASID %d\n",
 372                         args->queue_id, p->pasid);
 373
 374         mutex_lock(&p->mutex);
 375
 376         retval = pqm_update_queue(&p->pqm, args->queue_id, &properties);
 377
 378         mutex_unlock(&p->mutex);
 379
 380         return retval;
 381 }
 382
 383 static int kfd_ioctl_set_memory_policy(struct file *filep,
 384                                         struct kfd_process *p, void *data)
 385 {
 386         struct kfd_ioctl_set_memory_policy_args *args = data;
 387         struct kfd_dev *dev;
 388         int err = 0;
 389         struct kfd_process_device *pdd;
 390         enum cache_policy default_policy, alternate_policy;
 391
 392         if (args->default_policy != KFD_IOC_CACHE_POLICY_COHERENT
 393             && args->default_policy != KFD_IOC_CACHE_POLICY_NONCOHERENT) {
 394                 return -EINVAL;
 395         }
 396
 397         if (args->alternate_policy != KFD_IOC_CACHE_POLICY_COHERENT
 398             && args->alternate_policy != KFD_IOC_CACHE_POLICY_NONCOHERENT) {
 399                 return -EINVAL;
 400         }
 401
 402         dev = kfd_device_by_id(args->gpu_id);
 403         if (dev == NULL)
 404                 return -EINVAL;
 405
 406         mutex_lock(&p->mutex);
 407
 408         pdd = kfd_bind_process_to_device(dev, p);
 409         if (IS_ERR(pdd)) {
 410                 err = -ESRCH;
 411                 goto out;
 412         }
 413
 414         default_policy = (args->default_policy == KFD_IOC_CACHE_POLICY_COHERENT)
 415                          ? cache_policy_coherent : cache_policy_noncoherent;
 416
 417         alternate_policy =
 418                 (args->alternate_policy == KFD_IOC_CACHE_POLICY_COHERENT)
 419                    ? cache_policy_coherent : cache_policy_noncoherent;
 420
 421         if (!dev->dqm->ops.set_cache_memory_policy(dev->dqm,
 422                                 &pdd->qpd,
 423                                 default_policy,
 424                                 alternate_policy,
 425                                 (void __user *)args->alternate_aperture_base,
 426                                 args->alternate_aperture_size))
 427                 err = -EINVAL;
 428
 429 out:
 430         mutex_unlock(&p->mutex);
 431
 432         return err;
 433 }
 434
 435 static int kfd_ioctl_get_clock_counters(struct file *filep,
 436                                 struct kfd_process *p, void *data)
 437 {
 438         struct kfd_ioctl_get_clock_counters_args *args = data;
 439         struct kfd_dev *dev;
 440         struct timespec64 time;
 441
 442         dev = kfd_device_by_id(args->gpu_id);
 443         if (dev == NULL)
 444                 return -EINVAL;
 445
 446         /* Reading GPU clock counter from KGD */
 447         args->gpu_clock_counter =
 448                 dev->kfd2kgd->get_gpu_clock_counter(dev->kgd);
 449
 450         /* No access to rdtsc. Using raw monotonic time */
 451         getrawmonotonic64(&time);
 452         args->cpu_clock_counter = (uint64_t)timespec64_to_ns(&time);
 453
 454         get_monotonic_boottime64(&time);
 455         args->system_clock_counter = (uint64_t)timespec64_to_ns(&time);
 456
 457         /* Since the counter is in nano-seconds we use 1GHz frequency */
 458         args->system_clock_freq = 1000000000;
 459
 460         return 0;
 461 }
 462
 463
 464 static int kfd_ioctl_get_process_apertures(struct file *filp,
 465                                 struct kfd_process *p, void *data)
 466 {
 467         struct kfd_ioctl_get_process_apertures_args *args = data;
 468         struct kfd_process_device_apertures *pAperture;
 469         struct kfd_process_device *pdd;
 470
 471         dev_dbg(kfd_device, "get apertures for PASID %d", p->pasid);
 472
 473         args->num_of_nodes = 0;
 474
 475         mutex_lock(&p->mutex);
 476
 477         /*if the process-device list isn't empty*/
 478         if (kfd_has_process_device_data(p)) {
 479                 /* Run over all pdd of the process */
 480                 pdd = kfd_get_first_process_device_data(p);
 481                 do {
 482                         pAperture =
 483                                 &args->process_apertures[args->num_of_nodes];
 484                         pAperture->gpu_id = pdd->dev->id;
 485                         pAperture->lds_base = pdd->lds_base;
 486                         pAperture->lds_limit = pdd->lds_limit;
 487                         pAperture->gpuvm_base = pdd->gpuvm_base;
 488                         pAperture->gpuvm_limit = pdd->gpuvm_limit;
 489                         pAperture->scratch_base = pdd->scratch_base;
 490                         pAperture->scratch_limit = pdd->scratch_limit;
 491
 492                         dev_dbg(kfd_device,
 493                                 "node id %u\n", args->num_of_nodes);
 494                         dev_dbg(kfd_device,
 495                                 "gpu id %u\n", pdd->dev->id);
 496                         dev_dbg(kfd_device,
 497                                 "lds_base %llX\n", pdd->lds_base);
 498                         dev_dbg(kfd_device,
 499                                 "lds_limit %llX\n", pdd->lds_limit);
 500                         dev_dbg(kfd_device,
 501                                 "gpuvm_base %llX\n", pdd->gpuvm_base);
 502                         dev_dbg(kfd_device,
 503                                 "gpuvm_limit %llX\n", pdd->gpuvm_limit);
 504                         dev_dbg(kfd_device,
 505                                 "scratch_base %llX\n", pdd->scratch_base);
 506                         dev_dbg(kfd_device,
 507                                 "scratch_limit %llX\n", pdd->scratch_limit);
 508
 509                         args->num_of_nodes++;
 510                 } while ((pdd = kfd_get_next_process_device_data(p, pdd)) != NULL &&
 511                                 (args->num_of_nodes < NUM_OF_SUPPORTED_GPUS));
 512         }
 513
 514         mutex_unlock(&p->mutex);
 515
 516         return 0;
 517 }
 518
 519 static int kfd_ioctl_create_event(struct file *filp, struct kfd_process *p,
 520                                         void *data)
 521 {
 522         return -ENODEV;
 523 }
 524
 525 static int kfd_ioctl_destroy_event(struct file *filp, struct kfd_process *p,
 526                                         void *data)
 527 {
 528         return -ENODEV;
 529 }
 530
 531 static int kfd_ioctl_set_event(struct file *filp, struct kfd_process *p,
 532                                 void *data)
 533 {
 534         return -ENODEV;
 535 }
 536
 537 static int kfd_ioctl_reset_event(struct file *filp, struct kfd_process *p,
 538                                 void *data)
 539 {
 540         return -ENODEV;
 541 }
 542
 543 static int kfd_ioctl_wait_events(struct file *filp, struct kfd_process *p,
 544                                 void *data)
 545 {
 546         return -ENODEV;
 547 }
 548
 549 #define AMDKFD_IOCTL_DEF(ioctl, _func, _flags) \
 550         [_IOC_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0, .name = #ioctl}
 551
 552 /** Ioctl table */
 553 static const struct amdkfd_ioctl_desc amdkfd_ioctls[] = {
 554         AMDKFD_IOCTL_DEF(AMDKFD_IOC_GET_VERSION,
 555                         kfd_ioctl_get_version, 0),
 556
 557         AMDKFD_IOCTL_DEF(AMDKFD_IOC_CREATE_QUEUE,
 558                         kfd_ioctl_create_queue, 0),
 559
 560         AMDKFD_IOCTL_DEF(AMDKFD_IOC_DESTROY_QUEUE,
 561                         kfd_ioctl_destroy_queue, 0),
 562
 563         AMDKFD_IOCTL_DEF(AMDKFD_IOC_SET_MEMORY_POLICY,
 564                         kfd_ioctl_set_memory_policy, 0),
 565
 566         AMDKFD_IOCTL_DEF(AMDKFD_IOC_GET_CLOCK_COUNTERS,
 567                         kfd_ioctl_get_clock_counters, 0),
 568
 569         AMDKFD_IOCTL_DEF(AMDKFD_IOC_GET_PROCESS_APERTURES,
 570                         kfd_ioctl_get_process_apertures, 0),
 571
 572         AMDKFD_IOCTL_DEF(AMDKFD_IOC_UPDATE_QUEUE,
 573                         kfd_ioctl_update_queue, 0),
 574
 575         AMDKFD_IOCTL_DEF(AMDKFD_IOC_CREATE_EVENT,
 576                         kfd_ioctl_create_event, 0),
 577
 578         AMDKFD_IOCTL_DEF(AMDKFD_IOC_DESTROY_EVENT,
 579                         kfd_ioctl_destroy_event, 0),
 580
 581         AMDKFD_IOCTL_DEF(AMDKFD_IOC_SET_EVENT,
 582                         kfd_ioctl_set_event, 0),
 583
 584         AMDKFD_IOCTL_DEF(AMDKFD_IOC_RESET_EVENT,
 585                         kfd_ioctl_reset_event, 0),
 586
 587         AMDKFD_IOCTL_DEF(AMDKFD_IOC_WAIT_EVENTS,
 588                         kfd_ioctl_wait_events, 0),
 589 };
 590
 591 #define AMDKFD_CORE_IOCTL_COUNT ARRAY_SIZE(amdkfd_ioctls)
 592
 593 static long kfd_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
 594 {
 595         struct kfd_process *process;
 596         amdkfd_ioctl_t *func;
 597         const struct amdkfd_ioctl_desc *ioctl = NULL;
 598         unsigned int nr = _IOC_NR(cmd);
 599         char stack_kdata[128];
 600         char *kdata = NULL;
 601         unsigned int usize, asize;
 602         int retcode = -EINVAL;
 603
 604         if (nr >= AMDKFD_CORE_IOCTL_COUNT)
 605                 goto err_i1;
 606
 607         if ((nr >= AMDKFD_COMMAND_START) && (nr < AMDKFD_COMMAND_END)) {
 608                 u32 amdkfd_size;
 609
 610                 ioctl = &amdkfd_ioctls[nr];
 611
 612                 amdkfd_size = _IOC_SIZE(ioctl->cmd);
 613                 usize = asize = _IOC_SIZE(cmd);
 614                 if (amdkfd_size > asize)
 615                         asize = amdkfd_size;
 616
 617                 cmd = ioctl->cmd;
 618         } else
 619                 goto err_i1;
 620
 621         dev_dbg(kfd_device, "ioctl cmd 0x%x (#%d), arg 0x%lx\n", cmd, nr, arg);
 622
 623         process = kfd_get_process(current);
 624         if (IS_ERR(process)) {
 625                 dev_dbg(kfd_device, "no process\n");
 626                 goto err_i1;
 627         }
 628
 629         /* Do not trust userspace, use our own definition */
 630         func = ioctl->func;
 631
 632         if (unlikely(!func)) {
 633                 dev_dbg(kfd_device, "no function\n");
 634                 retcode = -EINVAL;
 635                 goto err_i1;
 636         }
 637
 638         if (cmd & (IOC_IN | IOC_OUT)) {
 639                 if (asize <= sizeof(stack_kdata)) {
 640                         kdata = stack_kdata;
 641                 } else {
 642                         kdata = kmalloc(asize, GFP_KERNEL);
 643                         if (!kdata) {
 644                                 retcode = -ENOMEM;
 645                                 goto err_i1;
 646                         }
 647                 }
 648                 if (asize > usize)
 649                         memset(kdata + usize, 0, asize - usize);
 650         }
 651
 652         if (cmd & IOC_IN) {
 653                 if (copy_from_user(kdata, (void __user *)arg, usize) != 0) {
 654                         retcode = -EFAULT;
 655                         goto err_i1;
 656                 }
 657         } else if (cmd & IOC_OUT) {
 658                 memset(kdata, 0, usize);
 659         }
 660
 661         retcode = func(filep, process, kdata);
 662
 663         if (cmd & IOC_OUT)
 664                 if (copy_to_user((void __user *)arg, kdata, usize) != 0)
 665                         retcode = -EFAULT;
 666
 667 err_i1:
 668         if (!ioctl)
 669                 dev_dbg(kfd_device, "invalid ioctl: pid=%d, cmd=0x%02x, nr=0x%02x\n",
 670                           task_pid_nr(current), cmd, nr);
 671
 672         if (kdata != stack_kdata)
 673                 kfree(kdata);
 674
 675         if (retcode)
 676                 dev_dbg(kfd_device, "ret = %d\n", retcode);
 677
 678         return retcode;
 679 }
 680
 681 static int kfd_mmap(struct file *filp, struct vm_area_struct *vma)
 682 {
 683         struct kfd_process *process;
 684
 685         process = kfd_get_process(current);
 686         if (IS_ERR(process))
 687                 return PTR_ERR(process);
 688
 689         if ((vma->vm_pgoff & KFD_MMAP_DOORBELL_MASK) ==
 690                         KFD_MMAP_DOORBELL_MASK) {
 691                 vma->vm_pgoff = vma->vm_pgoff ^ KFD_MMAP_DOORBELL_MASK;
 692                 return kfd_doorbell_mmap(process, vma);
 693         } else if ((vma->vm_pgoff & KFD_MMAP_EVENTS_MASK) ==
 694                         KFD_MMAP_EVENTS_MASK) {
 695                 vma->vm_pgoff = vma->vm_pgoff ^ KFD_MMAP_EVENTS_MASK;
 696                 return kfd_event_mmap(process, vma);
 697         }
 698
 699         return -EFAULT;
 700 }