drivers/gpu/drm/amd/amdkfd/kfd_device.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/amd-iommu.h>
  24 #include <linux/bsearch.h>
  25 #include <linux/pci.h>
  26 #include <linux/slab.h>
  27 #include "kfd_priv.h"
  28 #include "kfd_device_queue_manager.h"
  29 #include "kfd_pm4_headers_vi.h"
  30
  31 #define MQD_SIZE_ALIGNED 768
  32
  33 static const struct kfd_device_info kaveri_device_info = {
  34         .asic_family = CHIP_KAVERI,
  35         .max_pasid_bits = 16,
  36         /* max num of queues for KV.TODO should be a dynamic value */
  37         .max_no_of_hqd  = 24,
  38         .ih_ring_entry_size = 4 * sizeof(uint32_t),
  39         .event_interrupt_class = &event_interrupt_class_cik,
  40         .num_of_watch_points = 4,
  41         .mqd_size_aligned = MQD_SIZE_ALIGNED
  42 };
  43
  44 static const struct kfd_device_info carrizo_device_info = {
  45         .asic_family = CHIP_CARRIZO,
  46         .max_pasid_bits = 16,
  47         /* max num of queues for CZ.TODO should be a dynamic value */
  48         .max_no_of_hqd  = 24,
  49         .ih_ring_entry_size = 4 * sizeof(uint32_t),
  50         .event_interrupt_class = &event_interrupt_class_cik,
  51         .num_of_watch_points = 4,
  52         .mqd_size_aligned = MQD_SIZE_ALIGNED
  53 };
  54
  55 struct kfd_deviceid {
  56         unsigned short did;
  57         const struct kfd_device_info *device_info;
  58 };
  59
  60 /* Please keep this sorted by increasing device id. */
  61 static const struct kfd_deviceid supported_devices[] = {
  62         { 0x1304, &kaveri_device_info },        /* Kaveri */
  63         { 0x1305, &kaveri_device_info },        /* Kaveri */
  64         { 0x1306, &kaveri_device_info },        /* Kaveri */
  65         { 0x1307, &kaveri_device_info },        /* Kaveri */
  66         { 0x1309, &kaveri_device_info },        /* Kaveri */
  67         { 0x130A, &kaveri_device_info },        /* Kaveri */
  68         { 0x130B, &kaveri_device_info },        /* Kaveri */
  69         { 0x130C, &kaveri_device_info },        /* Kaveri */
  70         { 0x130D, &kaveri_device_info },        /* Kaveri */
  71         { 0x130E, &kaveri_device_info },        /* Kaveri */
  72         { 0x130F, &kaveri_device_info },        /* Kaveri */
  73         { 0x1310, &kaveri_device_info },        /* Kaveri */
  74         { 0x1311, &kaveri_device_info },        /* Kaveri */
  75         { 0x1312, &kaveri_device_info },        /* Kaveri */
  76         { 0x1313, &kaveri_device_info },        /* Kaveri */
  77         { 0x1315, &kaveri_device_info },        /* Kaveri */
  78         { 0x1316, &kaveri_device_info },        /* Kaveri */
  79         { 0x1317, &kaveri_device_info },        /* Kaveri */
  80         { 0x1318, &kaveri_device_info },        /* Kaveri */
  81         { 0x131B, &kaveri_device_info },        /* Kaveri */
  82         { 0x131C, &kaveri_device_info },        /* Kaveri */
  83         { 0x131D, &kaveri_device_info },        /* Kaveri */
  84         { 0x9870, &carrizo_device_info },       /* Carrizo */
  85         { 0x9874, &carrizo_device_info },       /* Carrizo */
  86         { 0x9875, &carrizo_device_info },       /* Carrizo */
  87         { 0x9876, &carrizo_device_info },       /* Carrizo */
  88         { 0x9877, &carrizo_device_info }        /* Carrizo */
  89 };
  90
  91 static int kfd_gtt_sa_init(struct kfd_dev *kfd, unsigned int buf_size,
  92                                 unsigned int chunk_size);
  93 static void kfd_gtt_sa_fini(struct kfd_dev *kfd);
  94
  95 static const struct kfd_device_info *lookup_device_info(unsigned short did)
  96 {
  97         size_t i;
  98
  99         for (i = 0; i < ARRAY_SIZE(supported_devices); i++) {
 100                 if (supported_devices[i].did == did) {
 101                         WARN_ON(!supported_devices[i].device_info);
 102                         return supported_devices[i].device_info;
 103                 }
 104         }
 105
 106         dev_warn(kfd_device, "DID %04x is missing in supported_devices\n",
 107                  did);
 108
 109         return NULL;
 110 }
 111
 112 struct kfd_dev *kgd2kfd_probe(struct kgd_dev *kgd,
 113         struct pci_dev *pdev, const struct kfd2kgd_calls *f2g)
 114 {
 115         struct kfd_dev *kfd;
 116
 117         const struct kfd_device_info *device_info =
 118                                         lookup_device_info(pdev->device);
 119
 120         if (!device_info) {
 121                 dev_err(kfd_device, "kgd2kfd_probe failed\n");
 122                 return NULL;
 123         }
 124
 125         kfd = kzalloc(sizeof(*kfd), GFP_KERNEL);
 126         if (!kfd)
 127                 return NULL;
 128
 129         kfd->kgd = kgd;
 130         kfd->device_info = device_info;
 131         kfd->pdev = pdev;
 132         kfd->init_complete = false;
 133         kfd->kfd2kgd = f2g;
 134
 135         mutex_init(&kfd->doorbell_mutex);
 136         memset(&kfd->doorbell_available_index, 0,
 137                 sizeof(kfd->doorbell_available_index));
 138
 139         return kfd;
 140 }
 141
 142 static bool device_iommu_pasid_init(struct kfd_dev *kfd)
 143 {
 144         const u32 required_iommu_flags = AMD_IOMMU_DEVICE_FLAG_ATS_SUP |
 145                                         AMD_IOMMU_DEVICE_FLAG_PRI_SUP |
 146                                         AMD_IOMMU_DEVICE_FLAG_PASID_SUP;
 147
 148         struct amd_iommu_device_info iommu_info;
 149         unsigned int pasid_limit;
 150         int err;
 151
 152         err = amd_iommu_device_info(kfd->pdev, &iommu_info);
 153         if (err < 0) {
 154                 dev_err(kfd_device,
 155                         "error getting iommu info. is the iommu enabled?\n");
 156                 return false;
 157         }
 158
 159         if ((iommu_info.flags & required_iommu_flags) != required_iommu_flags) {
 160                 dev_err(kfd_device, "error required iommu flags ats %i, pri %i, pasid %i\n",
 161                        (iommu_info.flags & AMD_IOMMU_DEVICE_FLAG_ATS_SUP) != 0,
 162                        (iommu_info.flags & AMD_IOMMU_DEVICE_FLAG_PRI_SUP) != 0,
 163                        (iommu_info.flags & AMD_IOMMU_DEVICE_FLAG_PASID_SUP)
 164                                                                         != 0);
 165                 return false;
 166         }
 167
 168         pasid_limit = min_t(unsigned int,
 169                         (unsigned int)(1 << kfd->device_info->max_pasid_bits),
 170                         iommu_info.max_pasids);
 171         /*
 172          * last pasid is used for kernel queues doorbells
 173          * in the future the last pasid might be used for a kernel thread.
 174          */
 175         pasid_limit = min_t(unsigned int,
 176                                 pasid_limit,
 177                                 kfd->doorbell_process_limit - 1);
 178
 179         err = amd_iommu_init_device(kfd->pdev, pasid_limit);
 180         if (err < 0) {
 181                 dev_err(kfd_device, "error initializing iommu device\n");
 182                 return false;
 183         }
 184
 185         if (!kfd_set_pasid_limit(pasid_limit)) {
 186                 dev_err(kfd_device, "error setting pasid limit\n");
 187                 amd_iommu_free_device(kfd->pdev);
 188                 return false;
 189         }
 190
 191         return true;
 192 }
 193
 194 static void iommu_pasid_shutdown_callback(struct pci_dev *pdev, int pasid)
 195 {
 196         struct kfd_dev *dev = kfd_device_by_pci_dev(pdev);
 197
 198         if (dev)
 199                 kfd_unbind_process_from_device(dev, pasid);
 200 }
 201
 202 /*
 203  * This function called by IOMMU driver on PPR failure
 204  */
 205 static int iommu_invalid_ppr_cb(struct pci_dev *pdev, int pasid,
 206                 unsigned long address, u16 flags)
 207 {
 208         struct kfd_dev *dev;
 209
 210         dev_warn(kfd_device,
 211                         "Invalid PPR device %x:%x.%x pasid %d address 0x%lX flags 0x%X",
 212                         PCI_BUS_NUM(pdev->devfn),
 213                         PCI_SLOT(pdev->devfn),
 214                         PCI_FUNC(pdev->devfn),
 215                         pasid,
 216                         address,
 217                         flags);
 218
 219         dev = kfd_device_by_pci_dev(pdev);
 220         if (!WARN_ON(!dev))
 221                 kfd_signal_iommu_event(dev, pasid, address,
 222                         flags & PPR_FAULT_WRITE, flags & PPR_FAULT_EXEC);
 223
 224         return AMD_IOMMU_INV_PRI_RSP_INVALID;
 225 }
 226
 227 bool kgd2kfd_device_init(struct kfd_dev *kfd,
 228                          const struct kgd2kfd_shared_resources *gpu_resources)
 229 {
 230         unsigned int size;
 231
 232         kfd->shared_resources = *gpu_resources;
 233
 234         /* calculate max size of mqds needed for queues */
 235         size = max_num_of_queues_per_device *
 236                         kfd->device_info->mqd_size_aligned;
 237
 238         /*
 239          * calculate max size of runlist packet.
 240          * There can be only 2 packets at once
 241          */
 242         size += (KFD_MAX_NUM_OF_PROCESSES * sizeof(struct pm4_mes_map_process) +
 243                 max_num_of_queues_per_device * sizeof(struct pm4_mes_map_queues)
 244                 + sizeof(struct pm4_mes_runlist)) * 2;
 245
 246         /* Add size of HIQ & DIQ */
 247         size += KFD_KERNEL_QUEUE_SIZE * 2;
 248
 249         /* add another 512KB for all other allocations on gart (HPD, fences) */
 250         size += 512 * 1024;
 251
 252         if (kfd->kfd2kgd->init_gtt_mem_allocation(
 253                         kfd->kgd, size, &kfd->gtt_mem,
 254                         &kfd->gtt_start_gpu_addr, &kfd->gtt_start_cpu_ptr)){
 255                 dev_err(kfd_device, "Could not allocate %d bytes\n", size);
 256                 goto out;
 257         }
 258
 259         dev_info(kfd_device, "Allocated %d bytes on gart\n", size);
 260
 261         /* Initialize GTT sa with 512 byte chunk size */
 262         if (kfd_gtt_sa_init(kfd, size, 512) != 0) {
 263                 dev_err(kfd_device, "Error initializing gtt sub-allocator\n");
 264                 goto kfd_gtt_sa_init_error;
 265         }
 266
 267         if (kfd_doorbell_init(kfd)) {
 268                 dev_err(kfd_device,
 269                         "Error initializing doorbell aperture\n");
 270                 goto kfd_doorbell_error;
 271         }
 272
 273         if (kfd_topology_add_device(kfd)) {
 274                 dev_err(kfd_device, "Error adding device to topology\n");
 275                 goto kfd_topology_add_device_error;
 276         }
 277
 278         if (kfd_interrupt_init(kfd)) {
 279                 dev_err(kfd_device, "Error initializing interrupts\n");
 280                 goto kfd_interrupt_error;
 281         }
 282
 283         if (!device_iommu_pasid_init(kfd)) {
 284                 dev_err(kfd_device,
 285                         "Error initializing iommuv2 for device %x:%x\n",
 286                         kfd->pdev->vendor, kfd->pdev->device);
 287                 goto device_iommu_pasid_error;
 288         }
 289         amd_iommu_set_invalidate_ctx_cb(kfd->pdev,
 290                                                 iommu_pasid_shutdown_callback);
 291         amd_iommu_set_invalid_ppr_cb(kfd->pdev, iommu_invalid_ppr_cb);
 292
 293         kfd->dqm = device_queue_manager_init(kfd);
 294         if (!kfd->dqm) {
 295                 dev_err(kfd_device, "Error initializing queue manager\n");
 296                 goto device_queue_manager_error;
 297         }
 298
 299         if (kfd->dqm->ops.start(kfd->dqm)) {
 300                 dev_err(kfd_device,
 301                         "Error starting queue manager for device %x:%x\n",
 302                         kfd->pdev->vendor, kfd->pdev->device);
 303                 goto dqm_start_error;
 304         }
 305
 306         kfd->dbgmgr = NULL;
 307
 308         kfd->init_complete = true;
 309         dev_info(kfd_device, "added device %x:%x\n", kfd->pdev->vendor,
 310                  kfd->pdev->device);
 311
 312         pr_debug("Starting kfd with the following scheduling policy %d\n",
 313                 sched_policy);
 314
 315         goto out;
 316
 317 dqm_start_error:
 318         device_queue_manager_uninit(kfd->dqm);
 319 device_queue_manager_error:
 320         amd_iommu_free_device(kfd->pdev);
 321 device_iommu_pasid_error:
 322         kfd_interrupt_exit(kfd);
 323 kfd_interrupt_error:
 324         kfd_topology_remove_device(kfd);
 325 kfd_topology_add_device_error:
 326         kfd_doorbell_fini(kfd);
 327 kfd_doorbell_error:
 328         kfd_gtt_sa_fini(kfd);
 329 kfd_gtt_sa_init_error:
 330         kfd->kfd2kgd->free_gtt_mem(kfd->kgd, kfd->gtt_mem);
 331         dev_err(kfd_device,
 332                 "device %x:%x NOT added due to errors\n",
 333                 kfd->pdev->vendor, kfd->pdev->device);
 334 out:
 335         return kfd->init_complete;
 336 }
 337
 338 void kgd2kfd_device_exit(struct kfd_dev *kfd)
 339 {
 340         if (kfd->init_complete) {
 341                 device_queue_manager_uninit(kfd->dqm);
 342                 amd_iommu_free_device(kfd->pdev);
 343                 kfd_interrupt_exit(kfd);
 344                 kfd_topology_remove_device(kfd);
 345                 kfd_doorbell_fini(kfd);
 346                 kfd_gtt_sa_fini(kfd);
 347                 kfd->kfd2kgd->free_gtt_mem(kfd->kgd, kfd->gtt_mem);
 348         }
 349
 350         kfree(kfd);
 351 }
 352
 353 void kgd2kfd_suspend(struct kfd_dev *kfd)
 354 {
 355         if (kfd->init_complete) {
 356                 kfd->dqm->ops.stop(kfd->dqm);
 357                 amd_iommu_set_invalidate_ctx_cb(kfd->pdev, NULL);
 358                 amd_iommu_set_invalid_ppr_cb(kfd->pdev, NULL);
 359                 amd_iommu_free_device(kfd->pdev);
 360         }
 361 }
 362
 363 int kgd2kfd_resume(struct kfd_dev *kfd)
 364 {
 365         unsigned int pasid_limit;
 366         int err;
 367
 368         pasid_limit = kfd_get_pasid_limit();
 369
 370         if (kfd->init_complete) {
 371                 err = amd_iommu_init_device(kfd->pdev, pasid_limit);
 372                 if (err < 0) {
 373                         dev_err(kfd_device, "failed to initialize iommu\n");
 374                         return -ENXIO;
 375                 }
 376
 377                 amd_iommu_set_invalidate_ctx_cb(kfd->pdev,
 378                                                 iommu_pasid_shutdown_callback);
 379                 amd_iommu_set_invalid_ppr_cb(kfd->pdev, iommu_invalid_ppr_cb);
 380                 kfd->dqm->ops.start(kfd->dqm);
 381         }
 382
 383         return 0;
 384 }
 385
 386 /* This is called directly from KGD at ISR. */
 387 void kgd2kfd_interrupt(struct kfd_dev *kfd, const void *ih_ring_entry)
 388 {
 389         if (!kfd->init_complete)
 390                 return;
 391
 392         spin_lock(&kfd->interrupt_lock);
 393
 394         if (kfd->interrupts_active
 395             && interrupt_is_wanted(kfd, ih_ring_entry)
 396             && enqueue_ih_ring_entry(kfd, ih_ring_entry))
 397                 schedule_work(&kfd->interrupt_work);
 398
 399         spin_unlock(&kfd->interrupt_lock);
 400 }
 401
 402 static int kfd_gtt_sa_init(struct kfd_dev *kfd, unsigned int buf_size,
 403                                 unsigned int chunk_size)
 404 {
 405         unsigned int num_of_longs;
 406
 407         if (WARN_ON(buf_size < chunk_size))
 408                 return -EINVAL;
 409         if (WARN_ON(buf_size == 0))
 410                 return -EINVAL;
 411         if (WARN_ON(chunk_size == 0))
 412                 return -EINVAL;
 413
 414         kfd->gtt_sa_chunk_size = chunk_size;
 415         kfd->gtt_sa_num_of_chunks = buf_size / chunk_size;
 416
 417         num_of_longs = (kfd->gtt_sa_num_of_chunks + BITS_PER_LONG - 1) /
 418                 BITS_PER_LONG;
 419
 420         kfd->gtt_sa_bitmap = kcalloc(num_of_longs, sizeof(long), GFP_KERNEL);
 421
 422         if (!kfd->gtt_sa_bitmap)
 423                 return -ENOMEM;
 424
 425         pr_debug("gtt_sa_num_of_chunks = %d, gtt_sa_bitmap = %p\n",
 426                         kfd->gtt_sa_num_of_chunks, kfd->gtt_sa_bitmap);
 427
 428         mutex_init(&kfd->gtt_sa_lock);
 429
 430         return 0;
 431
 432 }
 433
 434 static void kfd_gtt_sa_fini(struct kfd_dev *kfd)
 435 {
 436         mutex_destroy(&kfd->gtt_sa_lock);
 437         kfree(kfd->gtt_sa_bitmap);
 438 }
 439
 440 static inline uint64_t kfd_gtt_sa_calc_gpu_addr(uint64_t start_addr,
 441                                                 unsigned int bit_num,
 442                                                 unsigned int chunk_size)
 443 {
 444         return start_addr + bit_num * chunk_size;
 445 }
 446
 447 static inline uint32_t *kfd_gtt_sa_calc_cpu_addr(void *start_addr,
 448                                                 unsigned int bit_num,
 449                                                 unsigned int chunk_size)
 450 {
 451         return (uint32_t *) ((uint64_t) start_addr + bit_num * chunk_size);
 452 }
 453
 454 int kfd_gtt_sa_allocate(struct kfd_dev *kfd, unsigned int size,
 455                         struct kfd_mem_obj **mem_obj)
 456 {
 457         unsigned int found, start_search, cur_size;
 458
 459         if (size == 0)
 460                 return -EINVAL;
 461
 462         if (size > kfd->gtt_sa_num_of_chunks * kfd->gtt_sa_chunk_size)
 463                 return -ENOMEM;
 464
 465         *mem_obj = kmalloc(sizeof(struct kfd_mem_obj), GFP_KERNEL);
 466         if ((*mem_obj) == NULL)
 467                 return -ENOMEM;
 468
 469         pr_debug("Allocated mem_obj = %p for size = %d\n", *mem_obj, size);
 470
 471         start_search = 0;
 472
 473         mutex_lock(&kfd->gtt_sa_lock);
 474
 475 kfd_gtt_restart_search:
 476         /* Find the first chunk that is free */
 477         found = find_next_zero_bit(kfd->gtt_sa_bitmap,
 478                                         kfd->gtt_sa_num_of_chunks,
 479                                         start_search);
 480
 481         pr_debug("Found = %d\n", found);
 482
 483         /* If there wasn't any free chunk, bail out */
 484         if (found == kfd->gtt_sa_num_of_chunks)
 485                 goto kfd_gtt_no_free_chunk;
 486
 487         /* Update fields of mem_obj */
 488         (*mem_obj)->range_start = found;
 489         (*mem_obj)->range_end = found;
 490         (*mem_obj)->gpu_addr = kfd_gtt_sa_calc_gpu_addr(
 491                                         kfd->gtt_start_gpu_addr,
 492                                         found,
 493                                         kfd->gtt_sa_chunk_size);
 494         (*mem_obj)->cpu_ptr = kfd_gtt_sa_calc_cpu_addr(
 495                                         kfd->gtt_start_cpu_ptr,
 496                                         found,
 497                                         kfd->gtt_sa_chunk_size);
 498
 499         pr_debug("gpu_addr = %p, cpu_addr = %p\n",
 500                         (uint64_t *) (*mem_obj)->gpu_addr, (*mem_obj)->cpu_ptr);
 501
 502         /* If we need only one chunk, mark it as allocated and get out */
 503         if (size <= kfd->gtt_sa_chunk_size) {
 504                 pr_debug("Single bit\n");
 505                 set_bit(found, kfd->gtt_sa_bitmap);
 506                 goto kfd_gtt_out;
 507         }
 508
 509         /* Otherwise, try to see if we have enough contiguous chunks */
 510         cur_size = size - kfd->gtt_sa_chunk_size;
 511         do {
 512                 (*mem_obj)->range_end =
 513                         find_next_zero_bit(kfd->gtt_sa_bitmap,
 514                                         kfd->gtt_sa_num_of_chunks, ++found);
 515                 /*
 516                  * If next free chunk is not contiguous than we need to
 517                  * restart our search from the last free chunk we found (which
 518                  * wasn't contiguous to the previous ones
 519                  */
 520                 if ((*mem_obj)->range_end != found) {
 521                         start_search = found;
 522                         goto kfd_gtt_restart_search;
 523                 }
 524
 525                 /*
 526                  * If we reached end of buffer, bail out with error
 527                  */
 528                 if (found == kfd->gtt_sa_num_of_chunks)
 529                         goto kfd_gtt_no_free_chunk;
 530
 531                 /* Check if we don't need another chunk */
 532                 if (cur_size <= kfd->gtt_sa_chunk_size)
 533                         cur_size = 0;
 534                 else
 535                         cur_size -= kfd->gtt_sa_chunk_size;
 536
 537         } while (cur_size > 0);
 538
 539         pr_debug("range_start = %d, range_end = %d\n",
 540                 (*mem_obj)->range_start, (*mem_obj)->range_end);
 541
 542         /* Mark the chunks as allocated */
 543         for (found = (*mem_obj)->range_start;
 544                 found <= (*mem_obj)->range_end;
 545                 found++)
 546                 set_bit(found, kfd->gtt_sa_bitmap);
 547
 548 kfd_gtt_out:
 549         mutex_unlock(&kfd->gtt_sa_lock);
 550         return 0;
 551
 552 kfd_gtt_no_free_chunk:
 553         pr_debug("Allocation failed with mem_obj = %p\n", mem_obj);
 554         mutex_unlock(&kfd->gtt_sa_lock);
 555         kfree(mem_obj);
 556         return -ENOMEM;
 557 }
 558
 559 int kfd_gtt_sa_free(struct kfd_dev *kfd, struct kfd_mem_obj *mem_obj)
 560 {
 561         unsigned int bit;
 562
 563         /* Act like kfree when trying to free a NULL object */
 564         if (!mem_obj)
 565                 return 0;
 566
 567         pr_debug("Free mem_obj = %p, range_start = %d, range_end = %d\n",
 568                         mem_obj, mem_obj->range_start, mem_obj->range_end);
 569
 570         mutex_lock(&kfd->gtt_sa_lock);
 571
 572         /* Mark the chunks as free */
 573         for (bit = mem_obj->range_start;
 574                 bit <= mem_obj->range_end;
 575                 bit++)
 576                 clear_bit(bit, kfd->gtt_sa_bitmap);
 577
 578         mutex_unlock(&kfd->gtt_sa_lock);
 579
 580         kfree(mem_obj);
 581         return 0;
 582 }