drivers/gpu/drm/panfrost/panfrost_mmu.c

   1 // SPDX-License-Identifier:     GPL-2.0
   2 /* Copyright 2019 Linaro, Ltd, Rob Herring <robh@kernel.org> */
   3 #include <linux/atomic.h>
   4 #include <linux/bitfield.h>
   5 #include <linux/delay.h>
   6 #include <linux/dma-mapping.h>
   7 #include <linux/interrupt.h>
   8 #include <linux/io.h>
   9 #include <linux/iopoll.h>
  10 #include <linux/io-pgtable.h>
  11 #include <linux/iommu.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/pm_runtime.h>
  14 #include <linux/shmem_fs.h>
  15 #include <linux/sizes.h>
  16
  17 #include "panfrost_device.h"
  18 #include "panfrost_mmu.h"
  19 #include "panfrost_gem.h"
  20 #include "panfrost_features.h"
  21 #include "panfrost_regs.h"
  22
  23 #define mmu_write(dev, reg, data) writel(data, dev->iomem + reg)
  24 #define mmu_read(dev, reg) readl(dev->iomem + reg)
  25
  26 static int wait_ready(struct panfrost_device *pfdev, u32 as_nr)
  27 {
  28         int ret;
  29         u32 val;
  30
  31         /* Wait for the MMU status to indicate there is no active command, in
  32          * case one is pending. */
  33         ret = readl_relaxed_poll_timeout_atomic(pfdev->iomem + AS_STATUS(as_nr),
  34                 val, !(val & AS_STATUS_AS_ACTIVE), 10, 1000);
  35
  36         if (ret)
  37                 dev_err(pfdev->dev, "AS_ACTIVE bit stuck\n");
  38
  39         return ret;
  40 }
  41
  42 static int write_cmd(struct panfrost_device *pfdev, u32 as_nr, u32 cmd)
  43 {
  44         int status;
  45
  46         /* write AS_COMMAND when MMU is ready to accept another command */
  47         status = wait_ready(pfdev, as_nr);
  48         if (!status)
  49                 mmu_write(pfdev, AS_COMMAND(as_nr), cmd);
  50
  51         return status;
  52 }
  53
  54 static void lock_region(struct panfrost_device *pfdev, u32 as_nr,
  55                         u64 iova, size_t size)
  56 {
  57         u8 region_width;
  58         u64 region = iova & PAGE_MASK;
  59         /*
  60          * fls returns:
  61          * 1 .. 32
  62          *
  63          * 10 + fls(num_pages)
  64          * results in the range (11 .. 42)
  65          */
  66
  67         size = round_up(size, PAGE_SIZE);
  68
  69         region_width = 10 + fls(size >> PAGE_SHIFT);
  70         if ((size >> PAGE_SHIFT) != (1ul << (region_width - 11))) {
  71                 /* not pow2, so must go up to the next pow2 */
  72                 region_width += 1;
  73         }
  74         region |= region_width;
  75
  76         /* Lock the region that needs to be updated */
  77         mmu_write(pfdev, AS_LOCKADDR_LO(as_nr), region & 0xFFFFFFFFUL);
  78         mmu_write(pfdev, AS_LOCKADDR_HI(as_nr), (region >> 32) & 0xFFFFFFFFUL);
  79         write_cmd(pfdev, as_nr, AS_COMMAND_LOCK);
  80 }
  81
  82
  83 static int mmu_hw_do_operation_locked(struct panfrost_device *pfdev, int as_nr,
  84                                       u64 iova, size_t size, u32 op)
  85 {
  86         if (as_nr < 0)
  87                 return 0;
  88
  89         if (op != AS_COMMAND_UNLOCK)
  90                 lock_region(pfdev, as_nr, iova, size);
  91
  92         /* Run the MMU operation */
  93         write_cmd(pfdev, as_nr, op);
  94
  95         /* Wait for the flush to complete */
  96         return wait_ready(pfdev, as_nr);
  97 }
  98
  99 static int mmu_hw_do_operation(struct panfrost_device *pfdev,
 100                                struct panfrost_mmu *mmu,
 101                                u64 iova, size_t size, u32 op)
 102 {
 103         int ret;
 104
 105         spin_lock(&pfdev->as_lock);
 106         ret = mmu_hw_do_operation_locked(pfdev, mmu->as, iova, size, op);
 107         spin_unlock(&pfdev->as_lock);
 108         return ret;
 109 }
 110
 111 static void panfrost_mmu_enable(struct panfrost_device *pfdev, struct panfrost_mmu *mmu)
 112 {
 113         int as_nr = mmu->as;
 114         struct io_pgtable_cfg *cfg = &mmu->pgtbl_cfg;
 115         u64 transtab = cfg->arm_mali_lpae_cfg.transtab;
 116         u64 memattr = cfg->arm_mali_lpae_cfg.memattr;
 117
 118         mmu_hw_do_operation_locked(pfdev, as_nr, 0, ~0UL, AS_COMMAND_FLUSH_MEM);
 119
 120         mmu_write(pfdev, AS_TRANSTAB_LO(as_nr), transtab & 0xffffffffUL);
 121         mmu_write(pfdev, AS_TRANSTAB_HI(as_nr), transtab >> 32);
 122
 123         /* Need to revisit mem attrs.
 124          * NC is the default, Mali driver is inner WT.
 125          */
 126         mmu_write(pfdev, AS_MEMATTR_LO(as_nr), memattr & 0xffffffffUL);
 127         mmu_write(pfdev, AS_MEMATTR_HI(as_nr), memattr >> 32);
 128
 129         write_cmd(pfdev, as_nr, AS_COMMAND_UPDATE);
 130 }
 131
 132 static void panfrost_mmu_disable(struct panfrost_device *pfdev, u32 as_nr)
 133 {
 134         mmu_hw_do_operation_locked(pfdev, as_nr, 0, ~0UL, AS_COMMAND_FLUSH_MEM);
 135
 136         mmu_write(pfdev, AS_TRANSTAB_LO(as_nr), 0);
 137         mmu_write(pfdev, AS_TRANSTAB_HI(as_nr), 0);
 138
 139         mmu_write(pfdev, AS_MEMATTR_LO(as_nr), 0);
 140         mmu_write(pfdev, AS_MEMATTR_HI(as_nr), 0);
 141
 142         write_cmd(pfdev, as_nr, AS_COMMAND_UPDATE);
 143 }
 144
 145 u32 panfrost_mmu_as_get(struct panfrost_device *pfdev, struct panfrost_mmu *mmu)
 146 {
 147         int as;
 148
 149         spin_lock(&pfdev->as_lock);
 150
 151         as = mmu->as;
 152         if (as >= 0) {
 153                 int en = atomic_inc_return(&mmu->as_count);
 154                 WARN_ON(en >= NUM_JOB_SLOTS);
 155
 156                 list_move(&mmu->list, &pfdev->as_lru_list);
 157                 goto out;
 158         }
 159
 160         /* Check for a free AS */
 161         as = ffz(pfdev->as_alloc_mask);
 162         if (!(BIT(as) & pfdev->features.as_present)) {
 163                 struct panfrost_mmu *lru_mmu;
 164
 165                 list_for_each_entry_reverse(lru_mmu, &pfdev->as_lru_list, list) {
 166                         if (!atomic_read(&lru_mmu->as_count))
 167                                 break;
 168                 }
 169                 WARN_ON(&lru_mmu->list == &pfdev->as_lru_list);
 170
 171                 list_del_init(&lru_mmu->list);
 172                 as = lru_mmu->as;
 173
 174                 WARN_ON(as < 0);
 175                 lru_mmu->as = -1;
 176         }
 177
 178         /* Assign the free or reclaimed AS to the FD */
 179         mmu->as = as;
 180         set_bit(as, &pfdev->as_alloc_mask);
 181         atomic_set(&mmu->as_count, 1);
 182         list_add(&mmu->list, &pfdev->as_lru_list);
 183
 184         dev_dbg(pfdev->dev, "Assigned AS%d to mmu %p, alloc_mask=%lx", as, mmu, pfdev->as_alloc_mask);
 185
 186         panfrost_mmu_enable(pfdev, mmu);
 187
 188 out:
 189         spin_unlock(&pfdev->as_lock);
 190         return as;
 191 }
 192
 193 void panfrost_mmu_as_put(struct panfrost_device *pfdev, struct panfrost_mmu *mmu)
 194 {
 195         atomic_dec(&mmu->as_count);
 196         WARN_ON(atomic_read(&mmu->as_count) < 0);
 197 }
 198
 199 void panfrost_mmu_reset(struct panfrost_device *pfdev)
 200 {
 201         struct panfrost_mmu *mmu, *mmu_tmp;
 202
 203         spin_lock(&pfdev->as_lock);
 204
 205         pfdev->as_alloc_mask = 0;
 206
 207         list_for_each_entry_safe(mmu, mmu_tmp, &pfdev->as_lru_list, list) {
 208                 mmu->as = -1;
 209                 atomic_set(&mmu->as_count, 0);
 210                 list_del_init(&mmu->list);
 211         }
 212
 213         spin_unlock(&pfdev->as_lock);
 214
 215         mmu_write(pfdev, MMU_INT_CLEAR, ~0);
 216         mmu_write(pfdev, MMU_INT_MASK, ~0);
 217 }
 218
 219 static size_t get_pgsize(u64 addr, size_t size)
 220 {
 221         if (addr & (SZ_2M - 1) || size < SZ_2M)
 222                 return SZ_4K;
 223
 224         return SZ_2M;
 225 }
 226
 227 void panfrost_mmu_flush_range(struct panfrost_device *pfdev,
 228                               struct panfrost_mmu *mmu,
 229                               u64 iova, size_t size)
 230 {
 231         if (mmu->as < 0)
 232                 return;
 233
 234         pm_runtime_get_noresume(pfdev->dev);
 235
 236         /* Flush the PTs only if we're already awake */
 237         if (pm_runtime_active(pfdev->dev))
 238                 mmu_hw_do_operation(pfdev, mmu, iova, size, AS_COMMAND_FLUSH_PT);
 239
 240         pm_runtime_put_sync_autosuspend(pfdev->dev);
 241 }
 242
 243 static int mmu_map_sg(struct panfrost_device *pfdev, struct panfrost_mmu *mmu,
 244                       u64 iova, int prot, struct sg_table *sgt)
 245 {
 246         unsigned int count;
 247         struct scatterlist *sgl;
 248         struct io_pgtable_ops *ops = mmu->pgtbl_ops;
 249         u64 start_iova = iova;
 250
 251         for_each_sg(sgt->sgl, sgl, sgt->nents, count) {
 252                 unsigned long paddr = sg_dma_address(sgl);
 253                 size_t len = sg_dma_len(sgl);
 254
 255                 dev_dbg(pfdev->dev, "map: as=%d, iova=%llx, paddr=%lx, len=%zx", mmu->as, iova, paddr, len);
 256
 257                 while (len) {
 258                         size_t pgsize = get_pgsize(iova | paddr, len);
 259
 260                         ops->map(ops, iova, paddr, pgsize, prot);
 261                         iova += pgsize;
 262                         paddr += pgsize;
 263                         len -= pgsize;
 264                 }
 265         }
 266
 267         panfrost_mmu_flush_range(pfdev, mmu, start_iova, iova - start_iova);
 268
 269         return 0;
 270 }
 271
 272 int panfrost_mmu_map(struct panfrost_gem_object *bo)
 273 {
 274         struct drm_gem_object *obj = &bo->base.base;
 275         struct panfrost_device *pfdev = to_panfrost_device(obj->dev);
 276         struct sg_table *sgt;
 277         int prot = IOMMU_READ | IOMMU_WRITE;
 278
 279         if (WARN_ON(bo->is_mapped))
 280                 return 0;
 281
 282         if (bo->noexec)
 283                 prot |= IOMMU_NOEXEC;
 284
 285         sgt = drm_gem_shmem_get_pages_sgt(obj);
 286         if (WARN_ON(IS_ERR(sgt)))
 287                 return PTR_ERR(sgt);
 288
 289         mmu_map_sg(pfdev, bo->mmu, bo->node.start << PAGE_SHIFT, prot, sgt);
 290         bo->is_mapped = true;
 291
 292         return 0;
 293 }
 294
 295 void panfrost_mmu_unmap(struct panfrost_gem_object *bo)
 296 {
 297         struct drm_gem_object *obj = &bo->base.base;
 298         struct panfrost_device *pfdev = to_panfrost_device(obj->dev);
 299         struct io_pgtable_ops *ops = bo->mmu->pgtbl_ops;
 300         u64 iova = bo->node.start << PAGE_SHIFT;
 301         size_t len = bo->node.size << PAGE_SHIFT;
 302         size_t unmapped_len = 0;
 303
 304         if (WARN_ON(!bo->is_mapped))
 305                 return;
 306
 307         dev_dbg(pfdev->dev, "unmap: as=%d, iova=%llx, len=%zx", bo->mmu->as, iova, len);
 308
 309         while (unmapped_len < len) {
 310                 size_t unmapped_page;
 311                 size_t pgsize = get_pgsize(iova, len - unmapped_len);
 312
 313                 if (ops->iova_to_phys(ops, iova)) {
 314                         unmapped_page = ops->unmap(ops, iova, pgsize);
 315                         WARN_ON(unmapped_page != pgsize);
 316                 }
 317                 iova += pgsize;
 318                 unmapped_len += pgsize;
 319         }
 320
 321         panfrost_mmu_flush_range(pfdev, bo->mmu, bo->node.start << PAGE_SHIFT, len);
 322         bo->is_mapped = false;
 323 }
 324
 325 static void mmu_tlb_inv_context_s1(void *cookie)
 326 {}
 327
 328 static void mmu_tlb_inv_range_nosync(unsigned long iova, size_t size,
 329                                      size_t granule, bool leaf, void *cookie)
 330 {}
 331
 332 static void mmu_tlb_sync_context(void *cookie)
 333 {
 334         //struct panfrost_device *pfdev = cookie;
 335         // TODO: Wait 1000 GPU cycles for HW_ISSUE_6367/T60X
 336 }
 337
 338 static const struct iommu_gather_ops mmu_tlb_ops = {
 339         .tlb_flush_all  = mmu_tlb_inv_context_s1,
 340         .tlb_add_flush  = mmu_tlb_inv_range_nosync,
 341         .tlb_sync       = mmu_tlb_sync_context,
 342 };
 343
 344 int panfrost_mmu_pgtable_alloc(struct panfrost_file_priv *priv)
 345 {
 346         struct panfrost_mmu *mmu = &priv->mmu;
 347         struct panfrost_device *pfdev = priv->pfdev;
 348
 349         INIT_LIST_HEAD(&mmu->list);
 350         mmu->as = -1;
 351
 352         mmu->pgtbl_cfg = (struct io_pgtable_cfg) {
 353                 .pgsize_bitmap  = SZ_4K | SZ_2M,
 354                 .ias            = FIELD_GET(0xff, pfdev->features.mmu_features),
 355                 .oas            = FIELD_GET(0xff00, pfdev->features.mmu_features),
 356                 .tlb            = &mmu_tlb_ops,
 357                 .iommu_dev      = pfdev->dev,
 358         };
 359
 360         mmu->pgtbl_ops = alloc_io_pgtable_ops(ARM_MALI_LPAE, &mmu->pgtbl_cfg,
 361                                               priv);
 362         if (!mmu->pgtbl_ops)
 363                 return -EINVAL;
 364
 365         return 0;
 366 }
 367
 368 void panfrost_mmu_pgtable_free(struct panfrost_file_priv *priv)
 369 {
 370         struct panfrost_device *pfdev = priv->pfdev;
 371         struct panfrost_mmu *mmu = &priv->mmu;
 372
 373         spin_lock(&pfdev->as_lock);
 374         if (mmu->as >= 0) {
 375                 pm_runtime_get_noresume(pfdev->dev);
 376                 if (pm_runtime_active(pfdev->dev))
 377                         panfrost_mmu_disable(pfdev, mmu->as);
 378                 pm_runtime_put_autosuspend(pfdev->dev);
 379
 380                 clear_bit(mmu->as, &pfdev->as_alloc_mask);
 381                 clear_bit(mmu->as, &pfdev->as_in_use_mask);
 382                 list_del(&mmu->list);
 383         }
 384         spin_unlock(&pfdev->as_lock);
 385
 386         free_io_pgtable_ops(mmu->pgtbl_ops);
 387 }
 388
 389 static struct drm_mm_node *addr_to_drm_mm_node(struct panfrost_device *pfdev, int as, u64 addr)
 390 {
 391         struct drm_mm_node *node = NULL;
 392         u64 offset = addr >> PAGE_SHIFT;
 393         struct panfrost_mmu *mmu;
 394
 395         spin_lock(&pfdev->as_lock);
 396         list_for_each_entry(mmu, &pfdev->as_lru_list, list) {
 397                 struct panfrost_file_priv *priv;
 398                 if (as != mmu->as)
 399                         continue;
 400
 401                 priv = container_of(mmu, struct panfrost_file_priv, mmu);
 402                 drm_mm_for_each_node(node, &priv->mm) {
 403                         if (offset >= node->start && offset < (node->start + node->size))
 404                                 goto out;
 405                 }
 406         }
 407
 408 out:
 409         spin_unlock(&pfdev->as_lock);
 410         return node;
 411 }
 412
 413 #define NUM_FAULT_PAGES (SZ_2M / PAGE_SIZE)
 414
 415 int panfrost_mmu_map_fault_addr(struct panfrost_device *pfdev, int as, u64 addr)
 416 {
 417         int ret, i;
 418         struct drm_mm_node *node;
 419         struct panfrost_gem_object *bo;
 420         struct address_space *mapping;
 421         pgoff_t page_offset;
 422         struct sg_table *sgt;
 423         struct page **pages;
 424
 425         node = addr_to_drm_mm_node(pfdev, as, addr);
 426         if (!node)
 427                 return -ENOENT;
 428
 429         bo = drm_mm_node_to_panfrost_bo(node);
 430         if (!bo->is_heap) {
 431                 dev_WARN(pfdev->dev, "matching BO is not heap type (GPU VA = %llx)",
 432                          node->start << PAGE_SHIFT);
 433                 return -EINVAL;
 434         }
 435         WARN_ON(bo->mmu->as != as);
 436
 437         /* Assume 2MB alignment and size multiple */
 438         addr &= ~((u64)SZ_2M - 1);
 439         page_offset = addr >> PAGE_SHIFT;
 440         page_offset -= node->start;
 441
 442         mutex_lock(&bo->base.pages_lock);
 443
 444         if (!bo->base.pages) {
 445                 bo->sgts = kvmalloc_array(bo->base.base.size / SZ_2M,
 446                                      sizeof(struct sg_table), GFP_KERNEL | __GFP_ZERO);
 447                 if (!bo->sgts) {
 448                         mutex_unlock(&bo->base.pages_lock);
 449                         return -ENOMEM;
 450                 }
 451
 452                 pages = kvmalloc_array(bo->base.base.size >> PAGE_SHIFT,
 453                                        sizeof(struct page *), GFP_KERNEL | __GFP_ZERO);
 454                 if (!pages) {
 455                         kfree(bo->sgts);
 456                         bo->sgts = NULL;
 457                         mutex_unlock(&bo->base.pages_lock);
 458                         return -ENOMEM;
 459                 }
 460                 bo->base.pages = pages;
 461                 bo->base.pages_use_count = 1;
 462         } else
 463                 pages = bo->base.pages;
 464
 465         mapping = bo->base.base.filp->f_mapping;
 466         mapping_set_unevictable(mapping);
 467
 468         for (i = page_offset; i < page_offset + NUM_FAULT_PAGES; i++) {
 469                 pages[i] = shmem_read_mapping_page(mapping, i);
 470                 if (IS_ERR(pages[i])) {
 471                         mutex_unlock(&bo->base.pages_lock);
 472                         ret = PTR_ERR(pages[i]);
 473                         goto err_pages;
 474                 }
 475         }
 476
 477         mutex_unlock(&bo->base.pages_lock);
 478
 479         sgt = &bo->sgts[page_offset / (SZ_2M / PAGE_SIZE)];
 480         ret = sg_alloc_table_from_pages(sgt, pages + page_offset,
 481                                         NUM_FAULT_PAGES, 0, SZ_2M, GFP_KERNEL);
 482         if (ret)
 483                 goto err_pages;
 484
 485         if (!dma_map_sg(pfdev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL)) {
 486                 ret = -EINVAL;
 487                 goto err_map;
 488         }
 489
 490         mmu_map_sg(pfdev, bo->mmu, addr, IOMMU_WRITE | IOMMU_READ | IOMMU_NOEXEC, sgt);
 491
 492         bo->is_mapped = true;
 493
 494         dev_dbg(pfdev->dev, "mapped page fault @ AS%d %llx", as, addr);
 495
 496         return 0;
 497
 498 err_map:
 499         sg_free_table(sgt);
 500 err_pages:
 501         drm_gem_shmem_put_pages(&bo->base);
 502         return ret;
 503 }
 504
 505 static const char *access_type_name(struct panfrost_device *pfdev,
 506                 u32 fault_status)
 507 {
 508         switch (fault_status & AS_FAULTSTATUS_ACCESS_TYPE_MASK) {
 509         case AS_FAULTSTATUS_ACCESS_TYPE_ATOMIC:
 510                 if (panfrost_has_hw_feature(pfdev, HW_FEATURE_AARCH64_MMU))
 511                         return "ATOMIC";
 512                 else
 513                         return "UNKNOWN";
 514         case AS_FAULTSTATUS_ACCESS_TYPE_READ:
 515                 return "READ";
 516         case AS_FAULTSTATUS_ACCESS_TYPE_WRITE:
 517                 return "WRITE";
 518         case AS_FAULTSTATUS_ACCESS_TYPE_EX:
 519                 return "EXECUTE";
 520         default:
 521                 WARN_ON(1);
 522                 return NULL;
 523         }
 524 }
 525
 526 static irqreturn_t panfrost_mmu_irq_handler(int irq, void *data)
 527 {
 528         struct panfrost_device *pfdev = data;
 529
 530         if (!mmu_read(pfdev, MMU_INT_STAT))
 531                 return IRQ_NONE;
 532
 533         mmu_write(pfdev, MMU_INT_MASK, 0);
 534         return IRQ_WAKE_THREAD;
 535 }
 536
 537 static irqreturn_t panfrost_mmu_irq_handler_thread(int irq, void *data)
 538 {
 539         struct panfrost_device *pfdev = data;
 540         u32 status = mmu_read(pfdev, MMU_INT_RAWSTAT);
 541         int i, ret;
 542
 543         for (i = 0; status; i++) {
 544                 u32 mask = BIT(i) | BIT(i + 16);
 545                 u64 addr;
 546                 u32 fault_status;
 547                 u32 exception_type;
 548                 u32 access_type;
 549                 u32 source_id;
 550
 551                 if (!(status & mask))
 552                         continue;
 553
 554                 fault_status = mmu_read(pfdev, AS_FAULTSTATUS(i));
 555                 addr = mmu_read(pfdev, AS_FAULTADDRESS_LO(i));
 556                 addr |= (u64)mmu_read(pfdev, AS_FAULTADDRESS_HI(i)) << 32;
 557
 558                 /* decode the fault status */
 559                 exception_type = fault_status & 0xFF;
 560                 access_type = (fault_status >> 8) & 0x3;
 561                 source_id = (fault_status >> 16);
 562
 563                 /* Page fault only */
 564                 if ((status & mask) == BIT(i)) {
 565                         WARN_ON(exception_type < 0xC1 || exception_type > 0xC4);
 566
 567                         ret = panfrost_mmu_map_fault_addr(pfdev, i, addr);
 568                         if (!ret) {
 569                                 mmu_write(pfdev, MMU_INT_CLEAR, BIT(i));
 570                                 status &= ~mask;
 571                                 continue;
 572                         }
 573                 }
 574
 575                 /* terminal fault, print info about the fault */
 576                 dev_err(pfdev->dev,
 577                         "Unhandled Page fault in AS%d at VA 0x%016llX\n"
 578                         "Reason: %s\n"
 579                         "raw fault status: 0x%X\n"
 580                         "decoded fault status: %s\n"
 581                         "exception type 0x%X: %s\n"
 582                         "access type 0x%X: %s\n"
 583                         "source id 0x%X\n",
 584                         i, addr,
 585                         "TODO",
 586                         fault_status,
 587                         (fault_status & (1 << 10) ? "DECODER FAULT" : "SLAVE FAULT"),
 588                         exception_type, panfrost_exception_name(pfdev, exception_type),
 589                         access_type, access_type_name(pfdev, fault_status),
 590                         source_id);
 591
 592                 mmu_write(pfdev, MMU_INT_CLEAR, mask);
 593
 594                 status &= ~mask;
 595         }
 596
 597         mmu_write(pfdev, MMU_INT_MASK, ~0);
 598         return IRQ_HANDLED;
 599 };
 600
 601 int panfrost_mmu_init(struct panfrost_device *pfdev)
 602 {
 603         int err, irq;
 604
 605         irq = platform_get_irq_byname(to_platform_device(pfdev->dev), "mmu");
 606         if (irq <= 0)
 607                 return -ENODEV;
 608
 609         err = devm_request_threaded_irq(pfdev->dev, irq, panfrost_mmu_irq_handler,
 610                                         panfrost_mmu_irq_handler_thread,
 611                                         IRQF_SHARED, "mmu", pfdev);
 612
 613         if (err) {
 614                 dev_err(pfdev->dev, "failed to request mmu irq");
 615                 return err;
 616         }
 617
 618         return 0;
 619 }
 620
 621 void panfrost_mmu_fini(struct panfrost_device *pfdev)
 622 {
 623         mmu_write(pfdev, MMU_INT_MASK, 0);
 624 }