drivers/gpu/drm/armada/armada_gem.c

   1 /*
   2  * Copyright (C) 2012 Russell King
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8 #include <linux/dma-buf.h>
   9 #include <linux/dma-mapping.h>
  10 #include <linux/shmem_fs.h>
  11 #include <drm/drmP.h>
  12 #include "armada_drm.h"
  13 #include "armada_gem.h"
  14 #include <drm/armada_drm.h>
  15 #include "armada_ioctlP.h"
  16
  17 static int armada_gem_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
  18 {
  19         struct armada_gem_object *obj = drm_to_armada_gem(vma->vm_private_data);
  20         unsigned long addr = (unsigned long)vmf->virtual_address;
  21         unsigned long pfn = obj->phys_addr >> PAGE_SHIFT;
  22         int ret;
  23
  24         pfn += (addr - vma->vm_start) >> PAGE_SHIFT;
  25         ret = vm_insert_pfn(vma, addr, pfn);
  26
  27         switch (ret) {
  28         case 0:
  29         case -EBUSY:
  30                 return VM_FAULT_NOPAGE;
  31         case -ENOMEM:
  32                 return VM_FAULT_OOM;
  33         default:
  34                 return VM_FAULT_SIGBUS;
  35         }
  36 }
  37
  38 const struct vm_operations_struct armada_gem_vm_ops = {
  39         .fault  = armada_gem_vm_fault,
  40         .open   = drm_gem_vm_open,
  41         .close  = drm_gem_vm_close,
  42 };
  43
  44 static size_t roundup_gem_size(size_t size)
  45 {
  46         return roundup(size, PAGE_SIZE);
  47 }
  48
  49 /* dev->struct_mutex is held here */
  50 void armada_gem_free_object(struct drm_gem_object *obj)
  51 {
  52         struct armada_gem_object *dobj = drm_to_armada_gem(obj);
  53
  54         DRM_DEBUG_DRIVER("release obj %p\n", dobj);
  55
  56         drm_gem_free_mmap_offset(&dobj->obj);
  57
  58         if (dobj->page) {
  59                 /* page backed memory */
  60                 unsigned int order = get_order(dobj->obj.size);
  61                 __free_pages(dobj->page, order);
  62         } else if (dobj->linear) {
  63                 /* linear backed memory */
  64                 drm_mm_remove_node(dobj->linear);
  65                 kfree(dobj->linear);
  66                 if (dobj->addr)
  67                         iounmap(dobj->addr);
  68         }
  69
  70         if (dobj->obj.import_attach) {
  71                 /* We only ever display imported data */
  72                 dma_buf_unmap_attachment(dobj->obj.import_attach, dobj->sgt,
  73                                          DMA_TO_DEVICE);
  74                 drm_prime_gem_destroy(&dobj->obj, NULL);
  75         }
  76
  77         drm_gem_object_release(&dobj->obj);
  78
  79         kfree(dobj);
  80 }
  81
  82 int
  83 armada_gem_linear_back(struct drm_device *dev, struct armada_gem_object *obj)
  84 {
  85         struct armada_private *priv = dev->dev_private;
  86         size_t size = obj->obj.size;
  87
  88         if (obj->page || obj->linear)
  89                 return 0;
  90
  91         /*
  92          * If it is a small allocation (typically cursor, which will
  93          * be 32x64 or 64x32 ARGB pixels) try to get it from the system.
  94          * Framebuffers will never be this small (our minimum size for
  95          * framebuffers is larger than this anyway.)  Such objects are
  96          * only accessed by the CPU so we don't need any special handing
  97          * here.
  98          */
  99         if (size <= 8192) {
 100                 unsigned int order = get_order(size);
 101                 struct page *p = alloc_pages(GFP_KERNEL, order);
 102
 103                 if (p) {
 104                         obj->addr = page_address(p);
 105                         obj->phys_addr = page_to_phys(p);
 106                         obj->page = p;
 107
 108                         memset(obj->addr, 0, PAGE_ALIGN(size));
 109                 }
 110         }
 111
 112         /*
 113          * We could grab something from CMA if it's enabled, but that
 114          * involves building in a problem:
 115          *
 116          * CMA's interface uses dma_alloc_coherent(), which provides us
 117          * with an CPU virtual address and a device address.
 118          *
 119          * The CPU virtual address may be either an address in the kernel
 120          * direct mapped region (for example, as it would be on x86) or
 121          * it may be remapped into another part of kernel memory space
 122          * (eg, as it would be on ARM.)  This means virt_to_phys() on the
 123          * returned virtual address is invalid depending on the architecture
 124          * implementation.
 125          *
 126          * The device address may also not be a physical address; it may
 127          * be that there is some kind of remapping between the device and
 128          * system RAM, which makes the use of the device address also
 129          * unsafe to re-use as a physical address.
 130          *
 131          * This makes DRM usage of dma_alloc_coherent() in a generic way
 132          * at best very questionable and unsafe.
 133          */
 134
 135         /* Otherwise, grab it from our linear allocation */
 136         if (!obj->page) {
 137                 struct drm_mm_node *node;
 138                 unsigned align = min_t(unsigned, size, SZ_2M);
 139                 void __iomem *ptr;
 140                 int ret;
 141
 142                 node = kzalloc(sizeof(*node), GFP_KERNEL);
 143                 if (!node)
 144                         return -ENOSPC;
 145
 146                 mutex_lock(&dev->struct_mutex);
 147                 ret = drm_mm_insert_node(&priv->linear, node, size, align,
 148                                          DRM_MM_SEARCH_DEFAULT);
 149                 mutex_unlock(&dev->struct_mutex);
 150                 if (ret) {
 151                         kfree(node);
 152                         return ret;
 153                 }
 154
 155                 obj->linear = node;
 156
 157                 /* Ensure that the memory we're returning is cleared. */
 158                 ptr = ioremap_wc(obj->linear->start, size);
 159                 if (!ptr) {
 160                         mutex_lock(&dev->struct_mutex);
 161                         drm_mm_remove_node(obj->linear);
 162                         mutex_unlock(&dev->struct_mutex);
 163                         kfree(obj->linear);
 164                         obj->linear = NULL;
 165                         return -ENOMEM;
 166                 }
 167
 168                 memset_io(ptr, 0, size);
 169                 iounmap(ptr);
 170
 171                 obj->phys_addr = obj->linear->start;
 172                 obj->dev_addr = obj->linear->start;
 173         }
 174
 175         DRM_DEBUG_DRIVER("obj %p phys %#llx dev %#llx\n", obj,
 176                          (unsigned long long)obj->phys_addr,
 177                          (unsigned long long)obj->dev_addr);
 178
 179         return 0;
 180 }
 181
 182 void *
 183 armada_gem_map_object(struct drm_device *dev, struct armada_gem_object *dobj)
 184 {
 185         /* only linear objects need to be ioremap'd */
 186         if (!dobj->addr && dobj->linear)
 187                 dobj->addr = ioremap_wc(dobj->phys_addr, dobj->obj.size);
 188         return dobj->addr;
 189 }
 190
 191 struct armada_gem_object *
 192 armada_gem_alloc_private_object(struct drm_device *dev, size_t size)
 193 {
 194         struct armada_gem_object *obj;
 195
 196         size = roundup_gem_size(size);
 197
 198         obj = kzalloc(sizeof(*obj), GFP_KERNEL);
 199         if (!obj)
 200                 return NULL;
 201
 202         drm_gem_private_object_init(dev, &obj->obj, size);
 203         obj->dev_addr = DMA_ERROR_CODE;
 204
 205         DRM_DEBUG_DRIVER("alloc private obj %p size %zu\n", obj, size);
 206
 207         return obj;
 208 }
 209
 210 struct armada_gem_object *armada_gem_alloc_object(struct drm_device *dev,
 211         size_t size)
 212 {
 213         struct armada_gem_object *obj;
 214         struct address_space *mapping;
 215
 216         size = roundup_gem_size(size);
 217
 218         obj = kzalloc(sizeof(*obj), GFP_KERNEL);
 219         if (!obj)
 220                 return NULL;
 221
 222         if (drm_gem_object_init(dev, &obj->obj, size)) {
 223                 kfree(obj);
 224                 return NULL;
 225         }
 226
 227         obj->dev_addr = DMA_ERROR_CODE;
 228
 229         mapping = file_inode(obj->obj.filp)->i_mapping;
 230         mapping_set_gfp_mask(mapping, GFP_HIGHUSER | __GFP_RECLAIMABLE);
 231
 232         DRM_DEBUG_DRIVER("alloc obj %p size %zu\n", obj, size);
 233
 234         return obj;
 235 }
 236
 237 /* Dumb alloc support */
 238 int armada_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
 239         struct drm_mode_create_dumb *args)
 240 {
 241         struct armada_gem_object *dobj;
 242         u32 handle;
 243         size_t size;
 244         int ret;
 245
 246         args->pitch = armada_pitch(args->width, args->bpp);
 247         args->size = size = args->pitch * args->height;
 248
 249         dobj = armada_gem_alloc_private_object(dev, size);
 250         if (dobj == NULL)
 251                 return -ENOMEM;
 252
 253         ret = armada_gem_linear_back(dev, dobj);
 254         if (ret)
 255                 goto err;
 256
 257         ret = drm_gem_handle_create(file, &dobj->obj, &handle);
 258         if (ret)
 259                 goto err;
 260
 261         args->handle = handle;
 262
 263         /* drop reference from allocate - handle holds it now */
 264         DRM_DEBUG_DRIVER("obj %p size %zu handle %#x\n", dobj, size, handle);
 265  err:
 266         drm_gem_object_unreference_unlocked(&dobj->obj);
 267         return ret;
 268 }
 269
 270 int armada_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
 271         uint32_t handle, uint64_t *offset)
 272 {
 273         struct armada_gem_object *obj;
 274         int ret = 0;
 275
 276         mutex_lock(&dev->struct_mutex);
 277         obj = armada_gem_object_lookup(dev, file, handle);
 278         if (!obj) {
 279                 DRM_ERROR("failed to lookup gem object\n");
 280                 ret = -EINVAL;
 281                 goto err_unlock;
 282         }
 283
 284         /* Don't allow imported objects to be mapped */
 285         if (obj->obj.import_attach) {
 286                 ret = -EINVAL;
 287                 goto err_unlock;
 288         }
 289
 290         ret = drm_gem_create_mmap_offset(&obj->obj);
 291         if (ret == 0) {
 292                 *offset = drm_vma_node_offset_addr(&obj->obj.vma_node);
 293                 DRM_DEBUG_DRIVER("handle %#x offset %llx\n", handle, *offset);
 294         }
 295
 296         drm_gem_object_unreference(&obj->obj);
 297  err_unlock:
 298         mutex_unlock(&dev->struct_mutex);
 299
 300         return ret;
 301 }
 302
 303 int armada_gem_dumb_destroy(struct drm_file *file, struct drm_device *dev,
 304         uint32_t handle)
 305 {
 306         return drm_gem_handle_delete(file, handle);
 307 }
 308
 309 /* Private driver gem ioctls */
 310 int armada_gem_create_ioctl(struct drm_device *dev, void *data,
 311         struct drm_file *file)
 312 {
 313         struct drm_armada_gem_create *args = data;
 314         struct armada_gem_object *dobj;
 315         size_t size;
 316         u32 handle;
 317         int ret;
 318
 319         if (args->size == 0)
 320                 return -ENOMEM;
 321
 322         size = args->size;
 323
 324         dobj = armada_gem_alloc_object(dev, size);
 325         if (dobj == NULL)
 326                 return -ENOMEM;
 327
 328         ret = drm_gem_handle_create(file, &dobj->obj, &handle);
 329         if (ret)
 330                 goto err;
 331
 332         args->handle = handle;
 333
 334         /* drop reference from allocate - handle holds it now */
 335         DRM_DEBUG_DRIVER("obj %p size %zu handle %#x\n", dobj, size, handle);
 336  err:
 337         drm_gem_object_unreference_unlocked(&dobj->obj);
 338         return ret;
 339 }
 340
 341 /* Map a shmem-backed object into process memory space */
 342 int armada_gem_mmap_ioctl(struct drm_device *dev, void *data,
 343         struct drm_file *file)
 344 {
 345         struct drm_armada_gem_mmap *args = data;
 346         struct armada_gem_object *dobj;
 347         unsigned long addr;
 348
 349         dobj = armada_gem_object_lookup(dev, file, args->handle);
 350         if (dobj == NULL)
 351                 return -ENOENT;
 352
 353         if (!dobj->obj.filp) {
 354                 drm_gem_object_unreference(&dobj->obj);
 355                 return -EINVAL;
 356         }
 357
 358         addr = vm_mmap(dobj->obj.filp, 0, args->size, PROT_READ | PROT_WRITE,
 359                        MAP_SHARED, args->offset);
 360         drm_gem_object_unreference(&dobj->obj);
 361         if (IS_ERR_VALUE(addr))
 362                 return addr;
 363
 364         args->addr = addr;
 365
 366         return 0;
 367 }
 368
 369 int armada_gem_pwrite_ioctl(struct drm_device *dev, void *data,
 370         struct drm_file *file)
 371 {
 372         struct drm_armada_gem_pwrite *args = data;
 373         struct armada_gem_object *dobj;
 374         char __user *ptr;
 375         int ret;
 376
 377         DRM_DEBUG_DRIVER("handle %u off %u size %u ptr 0x%llx\n",
 378                 args->handle, args->offset, args->size, args->ptr);
 379
 380         if (args->size == 0)
 381                 return 0;
 382
 383         ptr = (char __user *)(uintptr_t)args->ptr;
 384
 385         if (!access_ok(VERIFY_READ, ptr, args->size))
 386                 return -EFAULT;
 387
 388         ret = fault_in_multipages_readable(ptr, args->size);
 389         if (ret)
 390                 return ret;
 391
 392         dobj = armada_gem_object_lookup(dev, file, args->handle);
 393         if (dobj == NULL)
 394                 return -ENOENT;
 395
 396         /* Must be a kernel-mapped object */
 397         if (!dobj->addr)
 398                 return -EINVAL;
 399
 400         if (args->offset > dobj->obj.size ||
 401             args->size > dobj->obj.size - args->offset) {
 402                 DRM_ERROR("invalid size: object size %u\n", dobj->obj.size);
 403                 ret = -EINVAL;
 404                 goto unref;
 405         }
 406
 407         if (copy_from_user(dobj->addr + args->offset, ptr, args->size)) {
 408                 ret = -EFAULT;
 409         } else if (dobj->update) {
 410                 dobj->update(dobj->update_data);
 411                 ret = 0;
 412         }
 413
 414  unref:
 415         drm_gem_object_unreference_unlocked(&dobj->obj);
 416         return ret;
 417 }
 418
 419 /* Prime support */
 420 struct sg_table *
 421 armada_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
 422         enum dma_data_direction dir)
 423 {
 424         struct drm_gem_object *obj = attach->dmabuf->priv;
 425         struct armada_gem_object *dobj = drm_to_armada_gem(obj);
 426         struct scatterlist *sg;
 427         struct sg_table *sgt;
 428         int i, num;
 429
 430         sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
 431         if (!sgt)
 432                 return NULL;
 433
 434         if (dobj->obj.filp) {
 435                 struct address_space *mapping;
 436                 int count;
 437
 438                 count = dobj->obj.size / PAGE_SIZE;
 439                 if (sg_alloc_table(sgt, count, GFP_KERNEL))
 440                         goto free_sgt;
 441
 442                 mapping = file_inode(dobj->obj.filp)->i_mapping;
 443
 444                 for_each_sg(sgt->sgl, sg, count, i) {
 445                         struct page *page;
 446
 447                         page = shmem_read_mapping_page(mapping, i);
 448                         if (IS_ERR(page)) {
 449                                 num = i;
 450                                 goto release;
 451                         }
 452
 453                         sg_set_page(sg, page, PAGE_SIZE, 0);
 454                 }
 455
 456                 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0) {
 457                         num = sgt->nents;
 458                         goto release;
 459                 }
 460         } else if (dobj->page) {
 461                 /* Single contiguous page */
 462                 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
 463                         goto free_sgt;
 464
 465                 sg_set_page(sgt->sgl, dobj->page, dobj->obj.size, 0);
 466
 467                 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
 468                         goto free_table;
 469         } else if (dobj->linear) {
 470                 /* Single contiguous physical region - no struct page */
 471                 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
 472                         goto free_sgt;
 473                 sg_dma_address(sgt->sgl) = dobj->dev_addr;
 474                 sg_dma_len(sgt->sgl) = dobj->obj.size;
 475         } else {
 476                 goto free_sgt;
 477         }
 478         return sgt;
 479
 480  release:
 481         for_each_sg(sgt->sgl, sg, num, i)
 482                 page_cache_release(sg_page(sg));
 483  free_table:
 484         sg_free_table(sgt);
 485  free_sgt:
 486         kfree(sgt);
 487         return NULL;
 488 }
 489
 490 static void armada_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
 491         struct sg_table *sgt, enum dma_data_direction dir)
 492 {
 493         struct drm_gem_object *obj = attach->dmabuf->priv;
 494         struct armada_gem_object *dobj = drm_to_armada_gem(obj);
 495         int i;
 496
 497         if (!dobj->linear)
 498                 dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
 499
 500         if (dobj->obj.filp) {
 501                 struct scatterlist *sg;
 502                 for_each_sg(sgt->sgl, sg, sgt->nents, i)
 503                         page_cache_release(sg_page(sg));
 504         }
 505
 506         sg_free_table(sgt);
 507         kfree(sgt);
 508 }
 509
 510 static void *armada_gem_dmabuf_no_kmap(struct dma_buf *buf, unsigned long n)
 511 {
 512         return NULL;
 513 }
 514
 515 static void
 516 armada_gem_dmabuf_no_kunmap(struct dma_buf *buf, unsigned long n, void *addr)
 517 {
 518 }
 519
 520 static int
 521 armada_gem_dmabuf_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
 522 {
 523         return -EINVAL;
 524 }
 525
 526 static const struct dma_buf_ops armada_gem_prime_dmabuf_ops = {
 527         .map_dma_buf    = armada_gem_prime_map_dma_buf,
 528         .unmap_dma_buf  = armada_gem_prime_unmap_dma_buf,
 529         .release        = drm_gem_dmabuf_release,
 530         .kmap_atomic    = armada_gem_dmabuf_no_kmap,
 531         .kunmap_atomic  = armada_gem_dmabuf_no_kunmap,
 532         .kmap           = armada_gem_dmabuf_no_kmap,
 533         .kunmap         = armada_gem_dmabuf_no_kunmap,
 534         .mmap           = armada_gem_dmabuf_mmap,
 535 };
 536
 537 struct dma_buf *
 538 armada_gem_prime_export(struct drm_device *dev, struct drm_gem_object *obj,
 539         int flags)
 540 {
 541         DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
 542
 543         exp_info.ops = &armada_gem_prime_dmabuf_ops;
 544         exp_info.size = obj->size;
 545         exp_info.flags = O_RDWR;
 546         exp_info.priv = obj;
 547
 548         return dma_buf_export(&exp_info);
 549 }
 550
 551 struct drm_gem_object *
 552 armada_gem_prime_import(struct drm_device *dev, struct dma_buf *buf)
 553 {
 554         struct dma_buf_attachment *attach;
 555         struct armada_gem_object *dobj;
 556
 557         if (buf->ops == &armada_gem_prime_dmabuf_ops) {
 558                 struct drm_gem_object *obj = buf->priv;
 559                 if (obj->dev == dev) {
 560                         /*
 561                          * Importing our own dmabuf(s) increases the
 562                          * refcount on the gem object itself.
 563                          */
 564                         drm_gem_object_reference(obj);
 565                         return obj;
 566                 }
 567         }
 568
 569         attach = dma_buf_attach(buf, dev->dev);
 570         if (IS_ERR(attach))
 571                 return ERR_CAST(attach);
 572
 573         dobj = armada_gem_alloc_private_object(dev, buf->size);
 574         if (!dobj) {
 575                 dma_buf_detach(buf, attach);
 576                 return ERR_PTR(-ENOMEM);
 577         }
 578
 579         dobj->obj.import_attach = attach;
 580         get_dma_buf(buf);
 581
 582         /*
 583          * Don't call dma_buf_map_attachment() here - it maps the
 584          * scatterlist immediately for DMA, and this is not always
 585          * an appropriate thing to do.
 586          */
 587         return &dobj->obj;
 588 }
 589
 590 int armada_gem_map_import(struct armada_gem_object *dobj)
 591 {
 592         int ret;
 593
 594         dobj->sgt = dma_buf_map_attachment(dobj->obj.import_attach,
 595                                           DMA_TO_DEVICE);
 596         if (!dobj->sgt) {
 597                 DRM_ERROR("dma_buf_map_attachment() returned NULL\n");
 598                 return -EINVAL;
 599         }
 600         if (IS_ERR(dobj->sgt)) {
 601                 ret = PTR_ERR(dobj->sgt);
 602                 dobj->sgt = NULL;
 603                 DRM_ERROR("dma_buf_map_attachment() error: %d\n", ret);
 604                 return ret;
 605         }
 606         if (dobj->sgt->nents > 1) {
 607                 DRM_ERROR("dma_buf_map_attachment() returned an (unsupported) scattered list\n");
 608                 return -EINVAL;
 609         }
 610         if (sg_dma_len(dobj->sgt->sgl) < dobj->obj.size) {
 611                 DRM_ERROR("dma_buf_map_attachment() returned a small buffer\n");
 612                 return -EINVAL;
 613         }
 614         dobj->dev_addr = sg_dma_address(dobj->sgt->sgl);
 615         return 0;
 616 }