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 #include "kfd_device_queue_manager.h"
  39
  40 static long kfd_ioctl(struct file *, unsigned int, unsigned long);
  41 static int kfd_open(struct inode *, struct file *);
  42 static int kfd_mmap(struct file *, struct vm_area_struct *);
  43
  44 static const char kfd_dev_name[] = "kfd";
  45
  46 static const struct file_operations kfd_fops = {
  47         .owner = THIS_MODULE,
  48         .unlocked_ioctl = kfd_ioctl,
  49         .compat_ioctl = kfd_ioctl,
  50         .open = kfd_open,
  51         .mmap = kfd_mmap,
  52 };
  53
  54 static int kfd_char_dev_major = -1;
  55 static struct class *kfd_class;
  56 struct device *kfd_device;
  57
  58 int kfd_chardev_init(void)
  59 {
  60         int err = 0;
  61
  62         kfd_char_dev_major = register_chrdev(0, kfd_dev_name, &kfd_fops);
  63         err = kfd_char_dev_major;
  64         if (err < 0)
  65                 goto err_register_chrdev;
  66
  67         kfd_class = class_create(THIS_MODULE, kfd_dev_name);
  68         err = PTR_ERR(kfd_class);
  69         if (IS_ERR(kfd_class))
  70                 goto err_class_create;
  71
  72         kfd_device = device_create(kfd_class, NULL,
  73                                         MKDEV(kfd_char_dev_major, 0),
  74                                         NULL, kfd_dev_name);
  75         err = PTR_ERR(kfd_device);
  76         if (IS_ERR(kfd_device))
  77                 goto err_device_create;
  78
  79         return 0;
  80
  81 err_device_create:
  82         class_destroy(kfd_class);
  83 err_class_create:
  84         unregister_chrdev(kfd_char_dev_major, kfd_dev_name);
  85 err_register_chrdev:
  86         return err;
  87 }
  88
  89 void kfd_chardev_exit(void)
  90 {
  91         device_destroy(kfd_class, MKDEV(kfd_char_dev_major, 0));
  92         class_destroy(kfd_class);
  93         unregister_chrdev(kfd_char_dev_major, kfd_dev_name);
  94 }
  95
  96 struct device *kfd_chardev(void)
  97 {
  98         return kfd_device;
  99 }
 100
 101
 102 static int kfd_open(struct inode *inode, struct file *filep)
 103 {
 104         struct kfd_process *process;
 105         bool is_32bit_user_mode;
 106
 107         if (iminor(inode) != 0)
 108                 return -ENODEV;
 109
 110         is_32bit_user_mode = is_compat_task();
 111
 112         if (is_32bit_user_mode == true) {
 113                 dev_warn(kfd_device,
 114                         "Process %d (32-bit) failed to open /dev/kfd\n"
 115                         "32-bit processes are not supported by amdkfd\n",
 116                         current->pid);
 117                 return -EPERM;
 118         }
 119
 120         process = kfd_create_process(current);
 121         if (IS_ERR(process))
 122                 return PTR_ERR(process);
 123
 124         process->is_32bit_user_mode = is_32bit_user_mode;
 125
 126         dev_dbg(kfd_device, "process %d opened, compat mode (32 bit) - %d\n",
 127                 process->pasid, process->is_32bit_user_mode);
 128
 129         kfd_init_apertures(process);
 130
 131         return 0;
 132 }
 133
 134 static long kfd_ioctl_get_version(struct file *filep, struct kfd_process *p,
 135                                         void __user *arg)
 136 {
 137         struct kfd_ioctl_get_version_args args;
 138         int err = 0;
 139
 140         args.major_version = KFD_IOCTL_MAJOR_VERSION;
 141         args.minor_version = KFD_IOCTL_MINOR_VERSION;
 142
 143         if (copy_to_user(arg, &args, sizeof(args)))
 144                 err = -EFAULT;
 145
 146         return err;
 147 }
 148
 149 static int set_queue_properties_from_user(struct queue_properties *q_properties,
 150                                 struct kfd_ioctl_create_queue_args *args)
 151 {
 152         if (args->queue_percentage > KFD_MAX_QUEUE_PERCENTAGE) {
 153                 pr_err("kfd: queue percentage must be between 0 to KFD_MAX_QUEUE_PERCENTAGE\n");
 154                 return -EINVAL;
 155         }
 156
 157         if (args->queue_priority > KFD_MAX_QUEUE_PRIORITY) {
 158                 pr_err("kfd: queue priority must be between 0 to KFD_MAX_QUEUE_PRIORITY\n");
 159                 return -EINVAL;
 160         }
 161
 162         if ((args->ring_base_address) &&
 163                 (!access_ok(VERIFY_WRITE,
 164                         (const void __user *) args->ring_base_address,
 165                         sizeof(uint64_t)))) {
 166                 pr_err("kfd: can't access ring base address\n");
 167                 return -EFAULT;
 168         }
 169
 170         if (!is_power_of_2(args->ring_size) && (args->ring_size != 0)) {
 171                 pr_err("kfd: ring size must be a power of 2 or 0\n");
 172                 return -EINVAL;
 173         }
 174
 175         if (!access_ok(VERIFY_WRITE,
 176                         (const void __user *) args->read_pointer_address,
 177                         sizeof(uint32_t))) {
 178                 pr_err("kfd: can't access read pointer\n");
 179                 return -EFAULT;
 180         }
 181
 182         if (!access_ok(VERIFY_WRITE,
 183                         (const void __user *) args->write_pointer_address,
 184                         sizeof(uint32_t))) {
 185                 pr_err("kfd: can't access write pointer\n");
 186                 return -EFAULT;
 187         }
 188
 189         q_properties->is_interop = false;
 190         q_properties->queue_percent = args->queue_percentage;
 191         q_properties->priority = args->queue_priority;
 192         q_properties->queue_address = args->ring_base_address;
 193         q_properties->queue_size = args->ring_size;
 194         q_properties->read_ptr = (uint32_t *) args->read_pointer_address;
 195         q_properties->write_ptr = (uint32_t *) args->write_pointer_address;
 196         if (args->queue_type == KFD_IOC_QUEUE_TYPE_COMPUTE ||
 197                 args->queue_type == KFD_IOC_QUEUE_TYPE_COMPUTE_AQL)
 198                 q_properties->type = KFD_QUEUE_TYPE_COMPUTE;
 199         else
 200                 return -ENOTSUPP;
 201
 202         if (args->queue_type == KFD_IOC_QUEUE_TYPE_COMPUTE_AQL)
 203                 q_properties->format = KFD_QUEUE_FORMAT_AQL;
 204         else
 205                 q_properties->format = KFD_QUEUE_FORMAT_PM4;
 206
 207         pr_debug("Queue Percentage (%d, %d)\n",
 208                         q_properties->queue_percent, args->queue_percentage);
 209
 210         pr_debug("Queue Priority (%d, %d)\n",
 211                         q_properties->priority, args->queue_priority);
 212
 213         pr_debug("Queue Address (0x%llX, 0x%llX)\n",
 214                         q_properties->queue_address, args->ring_base_address);
 215
 216         pr_debug("Queue Size (0x%llX, %u)\n",
 217                         q_properties->queue_size, args->ring_size);
 218
 219         pr_debug("Queue r/w Pointers (0x%llX, 0x%llX)\n",
 220                         (uint64_t) q_properties->read_ptr,
 221                         (uint64_t) q_properties->write_ptr);
 222
 223         pr_debug("Queue Format (%d)\n", q_properties->format);
 224
 225         return 0;
 226 }
 227
 228 static long kfd_ioctl_create_queue(struct file *filep, struct kfd_process *p,
 229                                         void __user *arg)
 230 {
 231         struct kfd_ioctl_create_queue_args args;
 232         struct kfd_dev *dev;
 233         int err = 0;
 234         unsigned int queue_id;
 235         struct kfd_process_device *pdd;
 236         struct queue_properties q_properties;
 237
 238         memset(&q_properties, 0, sizeof(struct queue_properties));
 239
 240         if (copy_from_user(&args, arg, sizeof(args)))
 241                 return -EFAULT;
 242
 243         pr_debug("kfd: creating queue ioctl\n");
 244
 245         err = set_queue_properties_from_user(&q_properties, &args);
 246         if (err)
 247                 return err;
 248
 249         dev = kfd_device_by_id(args.gpu_id);
 250         if (dev == NULL)
 251                 return -EINVAL;
 252
 253         mutex_lock(&p->mutex);
 254
 255         pdd = kfd_bind_process_to_device(dev, p);
 256         if (IS_ERR(pdd)) {
 257                 err = PTR_ERR(pdd);
 258                 goto err_bind_process;
 259         }
 260
 261         pr_debug("kfd: creating queue for PASID %d on GPU 0x%x\n",
 262                         p->pasid,
 263                         dev->id);
 264
 265         err = pqm_create_queue(&p->pqm, dev, filep, &q_properties, 0,
 266                                 KFD_QUEUE_TYPE_COMPUTE, &queue_id);
 267         if (err != 0)
 268                 goto err_create_queue;
 269
 270         args.queue_id = queue_id;
 271
 272         /* Return gpu_id as doorbell offset for mmap usage */
 273         args.doorbell_offset = args.gpu_id << PAGE_SHIFT;
 274
 275         if (copy_to_user(arg, &args, sizeof(args))) {
 276                 err = -EFAULT;
 277                 goto err_copy_args_out;
 278         }
 279
 280         mutex_unlock(&p->mutex);
 281
 282         pr_debug("kfd: queue id %d was created successfully\n", args.queue_id);
 283
 284         pr_debug("ring buffer address == 0x%016llX\n",
 285                         args.ring_base_address);
 286
 287         pr_debug("read ptr address    == 0x%016llX\n",
 288                         args.read_pointer_address);
 289
 290         pr_debug("write ptr address   == 0x%016llX\n",
 291                         args.write_pointer_address);
 292
 293         return 0;
 294
 295 err_copy_args_out:
 296         pqm_destroy_queue(&p->pqm, queue_id);
 297 err_create_queue:
 298 err_bind_process:
 299         mutex_unlock(&p->mutex);
 300         return err;
 301 }
 302
 303 static int kfd_ioctl_destroy_queue(struct file *filp, struct kfd_process *p,
 304                                         void __user *arg)
 305 {
 306         int retval;
 307         struct kfd_ioctl_destroy_queue_args args;
 308
 309         if (copy_from_user(&args, arg, sizeof(args)))
 310                 return -EFAULT;
 311
 312         pr_debug("kfd: destroying queue id %d for PASID %d\n",
 313                                 args.queue_id,
 314                                 p->pasid);
 315
 316         mutex_lock(&p->mutex);
 317
 318         retval = pqm_destroy_queue(&p->pqm, args.queue_id);
 319
 320         mutex_unlock(&p->mutex);
 321         return retval;
 322 }
 323
 324 static int kfd_ioctl_update_queue(struct file *filp, struct kfd_process *p,
 325                                         void __user *arg)
 326 {
 327         int retval;
 328         struct kfd_ioctl_update_queue_args args;
 329         struct queue_properties properties;
 330
 331         if (copy_from_user(&args, arg, sizeof(args)))
 332                 return -EFAULT;
 333
 334         if (args.queue_percentage > KFD_MAX_QUEUE_PERCENTAGE) {
 335                 pr_err("kfd: queue percentage must be between 0 to KFD_MAX_QUEUE_PERCENTAGE\n");
 336                 return -EINVAL;
 337         }
 338
 339         if (args.queue_priority > KFD_MAX_QUEUE_PRIORITY) {
 340                 pr_err("kfd: queue priority must be between 0 to KFD_MAX_QUEUE_PRIORITY\n");
 341                 return -EINVAL;
 342         }
 343
 344         if ((args.ring_base_address) &&
 345                 (!access_ok(VERIFY_WRITE,
 346                         (const void __user *) args.ring_base_address,
 347                         sizeof(uint64_t)))) {
 348                 pr_err("kfd: can't access ring base address\n");
 349                 return -EFAULT;
 350         }
 351
 352         if (!is_power_of_2(args.ring_size) && (args.ring_size != 0)) {
 353                 pr_err("kfd: ring size must be a power of 2 or 0\n");
 354                 return -EINVAL;
 355         }
 356
 357         properties.queue_address = args.ring_base_address;
 358         properties.queue_size = args.ring_size;
 359         properties.queue_percent = args.queue_percentage;
 360         properties.priority = args.queue_priority;
 361
 362         pr_debug("kfd: updating queue id %d for PASID %d\n",
 363                         args.queue_id, p->pasid);
 364
 365         mutex_lock(&p->mutex);
 366
 367         retval = pqm_update_queue(&p->pqm, args.queue_id, &properties);
 368
 369         mutex_unlock(&p->mutex);
 370
 371         return retval;
 372 }
 373
 374 static long kfd_ioctl_set_memory_policy(struct file *filep,
 375                                 struct kfd_process *p, void __user *arg)
 376 {
 377         struct kfd_ioctl_set_memory_policy_args args;
 378         struct kfd_dev *dev;
 379         int err = 0;
 380         struct kfd_process_device *pdd;
 381         enum cache_policy default_policy, alternate_policy;
 382
 383         if (copy_from_user(&args, arg, sizeof(args)))
 384                 return -EFAULT;
 385
 386         if (args.default_policy != KFD_IOC_CACHE_POLICY_COHERENT
 387             && args.default_policy != KFD_IOC_CACHE_POLICY_NONCOHERENT) {
 388                 return -EINVAL;
 389         }
 390
 391         if (args.alternate_policy != KFD_IOC_CACHE_POLICY_COHERENT
 392             && args.alternate_policy != KFD_IOC_CACHE_POLICY_NONCOHERENT) {
 393                 return -EINVAL;
 394         }
 395
 396         dev = kfd_device_by_id(args.gpu_id);
 397         if (dev == NULL)
 398                 return -EINVAL;
 399
 400         mutex_lock(&p->mutex);
 401
 402         pdd = kfd_bind_process_to_device(dev, p);
 403         if (IS_ERR(pdd)) {
 404                 err = PTR_ERR(pdd);
 405                 goto out;
 406         }
 407
 408         default_policy = (args.default_policy == KFD_IOC_CACHE_POLICY_COHERENT)
 409                          ? cache_policy_coherent : cache_policy_noncoherent;
 410
 411         alternate_policy =
 412                 (args.alternate_policy == KFD_IOC_CACHE_POLICY_COHERENT)
 413                    ? cache_policy_coherent : cache_policy_noncoherent;
 414
 415         if (!dev->dqm->set_cache_memory_policy(dev->dqm,
 416                                 &pdd->qpd,
 417                                 default_policy,
 418                                 alternate_policy,
 419                                 (void __user *)args.alternate_aperture_base,
 420                                 args.alternate_aperture_size))
 421                 err = -EINVAL;
 422
 423 out:
 424         mutex_unlock(&p->mutex);
 425
 426         return err;
 427 }
 428
 429 static long kfd_ioctl_get_clock_counters(struct file *filep,
 430                                 struct kfd_process *p, void __user *arg)
 431 {
 432         struct kfd_ioctl_get_clock_counters_args args;
 433         struct kfd_dev *dev;
 434         struct timespec time;
 435
 436         if (copy_from_user(&args, arg, sizeof(args)))
 437                 return -EFAULT;
 438
 439         dev = kfd_device_by_id(args.gpu_id);
 440         if (dev == NULL)
 441                 return -EINVAL;
 442
 443         /* Reading GPU clock counter from KGD */
 444         args.gpu_clock_counter = kfd2kgd->get_gpu_clock_counter(dev->kgd);
 445
 446         /* No access to rdtsc. Using raw monotonic time */
 447         getrawmonotonic(&time);
 448         args.cpu_clock_counter = (uint64_t)timespec_to_ns(&time);
 449
 450         get_monotonic_boottime(&time);
 451         args.system_clock_counter = (uint64_t)timespec_to_ns(&time);
 452
 453         /* Since the counter is in nano-seconds we use 1GHz frequency */
 454         args.system_clock_freq = 1000000000;
 455
 456         if (copy_to_user(arg, &args, sizeof(args)))
 457                 return -EFAULT;
 458
 459         return 0;
 460 }
 461
 462
 463 static int kfd_ioctl_get_process_apertures(struct file *filp,
 464                                 struct kfd_process *p, void __user *arg)
 465 {
 466         struct kfd_ioctl_get_process_apertures_args args;
 467         struct kfd_process_device_apertures *pAperture;
 468         struct kfd_process_device *pdd;
 469
 470         dev_dbg(kfd_device, "get apertures for PASID %d", p->pasid);
 471
 472         if (copy_from_user(&args, arg, sizeof(args)))
 473                 return -EFAULT;
 474
 475         args.num_of_nodes = 0;
 476
 477         mutex_lock(&p->mutex);
 478
 479         /*if the process-device list isn't empty*/
 480         if (kfd_has_process_device_data(p)) {
 481                 /* Run over all pdd of the process */
 482                 pdd = kfd_get_first_process_device_data(p);
 483                 do {
 484                         pAperture = &args.process_apertures[args.num_of_nodes];
 485                         pAperture->gpu_id = pdd->dev->id;
 486                         pAperture->lds_base = pdd->lds_base;
 487                         pAperture->lds_limit = pdd->lds_limit;
 488                         pAperture->gpuvm_base = pdd->gpuvm_base;
 489                         pAperture->gpuvm_limit = pdd->gpuvm_limit;
 490                         pAperture->scratch_base = pdd->scratch_base;
 491                         pAperture->scratch_limit = pdd->scratch_limit;
 492
 493                         dev_dbg(kfd_device,
 494                                 "node id %u\n", args.num_of_nodes);
 495                         dev_dbg(kfd_device,
 496                                 "gpu id %u\n", pdd->dev->id);
 497                         dev_dbg(kfd_device,
 498                                 "lds_base %llX\n", pdd->lds_base);
 499                         dev_dbg(kfd_device,
 500                                 "lds_limit %llX\n", pdd->lds_limit);
 501                         dev_dbg(kfd_device,
 502                                 "gpuvm_base %llX\n", pdd->gpuvm_base);
 503                         dev_dbg(kfd_device,
 504                                 "gpuvm_limit %llX\n", pdd->gpuvm_limit);
 505                         dev_dbg(kfd_device,
 506                                 "scratch_base %llX\n", pdd->scratch_base);
 507                         dev_dbg(kfd_device,
 508                                 "scratch_limit %llX\n", pdd->scratch_limit);
 509
 510                         args.num_of_nodes++;
 511                 } while ((pdd = kfd_get_next_process_device_data(p, pdd)) != NULL &&
 512                                 (args.num_of_nodes < NUM_OF_SUPPORTED_GPUS));
 513         }
 514
 515         mutex_unlock(&p->mutex);
 516
 517         if (copy_to_user(arg, &args, sizeof(args)))
 518                 return -EFAULT;
 519
 520         return 0;
 521 }
 522
 523 static long kfd_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
 524 {
 525         struct kfd_process *process;
 526         long err = -EINVAL;
 527
 528         dev_dbg(kfd_device,
 529                 "ioctl cmd 0x%x (#%d), arg 0x%lx\n",
 530                 cmd, _IOC_NR(cmd), arg);
 531
 532         process = kfd_get_process(current);
 533         if (IS_ERR(process))
 534                 return PTR_ERR(process);
 535
 536         switch (cmd) {
 537         case KFD_IOC_GET_VERSION:
 538                 err = kfd_ioctl_get_version(filep, process, (void __user *)arg);
 539                 break;
 540         case KFD_IOC_CREATE_QUEUE:
 541                 err = kfd_ioctl_create_queue(filep, process,
 542                                                 (void __user *)arg);
 543                 break;
 544
 545         case KFD_IOC_DESTROY_QUEUE:
 546                 err = kfd_ioctl_destroy_queue(filep, process,
 547                                                 (void __user *)arg);
 548                 break;
 549
 550         case KFD_IOC_SET_MEMORY_POLICY:
 551                 err = kfd_ioctl_set_memory_policy(filep, process,
 552                                                 (void __user *)arg);
 553                 break;
 554
 555         case KFD_IOC_GET_CLOCK_COUNTERS:
 556                 err = kfd_ioctl_get_clock_counters(filep, process,
 557                                                 (void __user *)arg);
 558                 break;
 559
 560         case KFD_IOC_GET_PROCESS_APERTURES:
 561                 err = kfd_ioctl_get_process_apertures(filep, process,
 562                                                 (void __user *)arg);
 563                 break;
 564
 565         case KFD_IOC_UPDATE_QUEUE:
 566                 err = kfd_ioctl_update_queue(filep, process,
 567                                                 (void __user *)arg);
 568                 break;
 569
 570         default:
 571                 dev_err(kfd_device,
 572                         "unknown ioctl cmd 0x%x, arg 0x%lx)\n",
 573                         cmd, arg);
 574                 err = -EINVAL;
 575                 break;
 576         }
 577
 578         if (err < 0)
 579                 dev_err(kfd_device,
 580                         "ioctl error %ld for ioctl cmd 0x%x (#%d)\n",
 581                         err, cmd, _IOC_NR(cmd));
 582
 583         return err;
 584 }
 585
 586 static int kfd_mmap(struct file *filp, struct vm_area_struct *vma)
 587 {
 588         struct kfd_process *process;
 589
 590         process = kfd_get_process(current);
 591         if (IS_ERR(process))
 592                 return PTR_ERR(process);
 593
 594         return kfd_doorbell_mmap(process, vma);
 595 }