root/drivers/gpu/drm/rockchip/rockchip_drm_gem.c

DEFINITIONS

1. rockchip_gem_iommu_map
2. rockchip_gem_iommu_unmap
3. rockchip_gem_get_pages
4. rockchip_gem_put_pages
5. rockchip_gem_alloc_iommu
6. rockchip_gem_alloc_dma
7. rockchip_gem_alloc_buf
8. rockchip_gem_free_iommu
9. rockchip_gem_free_dma
10. rockchip_gem_free_buf
11. rockchip_drm_gem_object_mmap_iommu
12. rockchip_drm_gem_object_mmap_dma
13. rockchip_drm_gem_object_mmap
14. rockchip_gem_mmap_buf
15. rockchip_gem_mmap
16. rockchip_gem_release_object
17. rockchip_gem_alloc_object
18. rockchip_gem_create_object
19. rockchip_gem_free_object
20. rockchip_gem_create_with_handle
21. rockchip_gem_dumb_create
22. rockchip_gem_prime_get_sg_table
23. rockchip_sg_get_contiguous_size
24. rockchip_gem_iommu_map_sg
25. rockchip_gem_dma_map_sg
26. rockchip_gem_prime_import_sg_table
27. rockchip_gem_prime_vmap
28. rockchip_gem_prime_vunmap

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
   4  * Author:Mark Yao <mark.yao@rock-chips.com>
   5  */
   6 
   7 #include <linux/dma-buf.h>
   8 #include <linux/iommu.h>
   9 
  10 #include <drm/drm.h>
  11 #include <drm/drm_gem.h>
  12 #include <drm/drm_prime.h>
  13 #include <drm/drm_vma_manager.h>
  14 
  15 #include "rockchip_drm_drv.h"
  16 #include "rockchip_drm_gem.h"
  17 
  18 static int rockchip_gem_iommu_map(struct rockchip_gem_object *rk_obj)
  19 {
  20         struct drm_device *drm = rk_obj->base.dev;
  21         struct rockchip_drm_private *private = drm->dev_private;
  22         int prot = IOMMU_READ | IOMMU_WRITE;
  23         ssize_t ret;
  24 
  25         mutex_lock(&private->mm_lock);
  26         ret = drm_mm_insert_node_generic(&private->mm, &rk_obj->mm,
  27                                          rk_obj->base.size, PAGE_SIZE,
  28                                          0, 0);
  29         mutex_unlock(&private->mm_lock);
  30 
  31         if (ret < 0) {
  32                 DRM_ERROR("out of I/O virtual memory: %zd\n", ret);
  33                 return ret;
  34         }
  35 
  36         rk_obj->dma_addr = rk_obj->mm.start;
  37 
  38         ret = iommu_map_sg(private->domain, rk_obj->dma_addr, rk_obj->sgt->sgl,
  39                            rk_obj->sgt->nents, prot);
  40         if (ret < rk_obj->base.size) {
  41                 DRM_ERROR("failed to map buffer: size=%zd request_size=%zd\n",
  42                           ret, rk_obj->base.size);
  43                 ret = -ENOMEM;
  44                 goto err_remove_node;
  45         }
  46 
  47         rk_obj->size = ret;
  48 
  49         return 0;
  50 
  51 err_remove_node:
  52         mutex_lock(&private->mm_lock);
  53         drm_mm_remove_node(&rk_obj->mm);
  54         mutex_unlock(&private->mm_lock);
  55 
  56         return ret;
  57 }
  58 
  59 static int rockchip_gem_iommu_unmap(struct rockchip_gem_object *rk_obj)
  60 {
  61         struct drm_device *drm = rk_obj->base.dev;
  62         struct rockchip_drm_private *private = drm->dev_private;
  63 
  64         iommu_unmap(private->domain, rk_obj->dma_addr, rk_obj->size);
  65 
  66         mutex_lock(&private->mm_lock);
  67 
  68         drm_mm_remove_node(&rk_obj->mm);
  69 
  70         mutex_unlock(&private->mm_lock);
  71 
  72         return 0;
  73 }
  74 
  75 static int rockchip_gem_get_pages(struct rockchip_gem_object *rk_obj)
  76 {
  77         struct drm_device *drm = rk_obj->base.dev;
  78         int ret, i;
  79         struct scatterlist *s;
  80 
  81         rk_obj->pages = drm_gem_get_pages(&rk_obj->base);
  82         if (IS_ERR(rk_obj->pages))
  83                 return PTR_ERR(rk_obj->pages);
  84 
  85         rk_obj->num_pages = rk_obj->base.size >> PAGE_SHIFT;
  86 
  87         rk_obj->sgt = drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages);
  88         if (IS_ERR(rk_obj->sgt)) {
  89                 ret = PTR_ERR(rk_obj->sgt);
  90                 goto err_put_pages;
  91         }
  92 
  93         /*
  94          * Fake up the SG table so that dma_sync_sg_for_device() can be used
  95          * to flush the pages associated with it.
  96          *
  97          * TODO: Replace this by drm_clflush_sg() once it can be implemented
  98          * without relying on symbols that are not exported.
  99          */
 100         for_each_sg(rk_obj->sgt->sgl, s, rk_obj->sgt->nents, i)
 101                 sg_dma_address(s) = sg_phys(s);
 102 
 103         dma_sync_sg_for_device(drm->dev, rk_obj->sgt->sgl, rk_obj->sgt->nents,
 104                                DMA_TO_DEVICE);
 105 
 106         return 0;
 107 
 108 err_put_pages:
 109         drm_gem_put_pages(&rk_obj->base, rk_obj->pages, false, false);
 110         return ret;
 111 }
 112 
 113 static void rockchip_gem_put_pages(struct rockchip_gem_object *rk_obj)
 114 {
 115         sg_free_table(rk_obj->sgt);
 116         kfree(rk_obj->sgt);
 117         drm_gem_put_pages(&rk_obj->base, rk_obj->pages, true, true);
 118 }
 119 
 120 static int rockchip_gem_alloc_iommu(struct rockchip_gem_object *rk_obj,
 121                                     bool alloc_kmap)
 122 {
 123         int ret;
 124 
 125         ret = rockchip_gem_get_pages(rk_obj);
 126         if (ret < 0)
 127                 return ret;
 128 
 129         ret = rockchip_gem_iommu_map(rk_obj);
 130         if (ret < 0)
 131                 goto err_free;
 132 
 133         if (alloc_kmap) {
 134                 rk_obj->kvaddr = vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
 135                                       pgprot_writecombine(PAGE_KERNEL));
 136                 if (!rk_obj->kvaddr) {
 137                         DRM_ERROR("failed to vmap() buffer\n");
 138                         ret = -ENOMEM;
 139                         goto err_unmap;
 140                 }
 141         }
 142 
 143         return 0;
 144 
 145 err_unmap:
 146         rockchip_gem_iommu_unmap(rk_obj);
 147 err_free:
 148         rockchip_gem_put_pages(rk_obj);
 149 
 150         return ret;
 151 }
 152 
 153 static int rockchip_gem_alloc_dma(struct rockchip_gem_object *rk_obj,
 154                                   bool alloc_kmap)
 155 {
 156         struct drm_gem_object *obj = &rk_obj->base;
 157         struct drm_device *drm = obj->dev;
 158 
 159         rk_obj->dma_attrs = DMA_ATTR_WRITE_COMBINE;
 160 
 161         if (!alloc_kmap)
 162                 rk_obj->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
 163 
 164         rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
 165                                          &rk_obj->dma_addr, GFP_KERNEL,
 166                                          rk_obj->dma_attrs);
 167         if (!rk_obj->kvaddr) {
 168                 DRM_ERROR("failed to allocate %zu byte dma buffer", obj->size);
 169                 return -ENOMEM;
 170         }
 171 
 172         return 0;
 173 }
 174 
 175 static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
 176                                   bool alloc_kmap)
 177 {
 178         struct drm_gem_object *obj = &rk_obj->base;
 179         struct drm_device *drm = obj->dev;
 180         struct rockchip_drm_private *private = drm->dev_private;
 181 
 182         if (private->domain)
 183                 return rockchip_gem_alloc_iommu(rk_obj, alloc_kmap);
 184         else
 185                 return rockchip_gem_alloc_dma(rk_obj, alloc_kmap);
 186 }
 187 
 188 static void rockchip_gem_free_iommu(struct rockchip_gem_object *rk_obj)
 189 {
 190         vunmap(rk_obj->kvaddr);
 191         rockchip_gem_iommu_unmap(rk_obj);
 192         rockchip_gem_put_pages(rk_obj);
 193 }
 194 
 195 static void rockchip_gem_free_dma(struct rockchip_gem_object *rk_obj)
 196 {
 197         struct drm_gem_object *obj = &rk_obj->base;
 198         struct drm_device *drm = obj->dev;
 199 
 200         dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,
 201                        rk_obj->dma_attrs);
 202 }
 203 
 204 static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
 205 {
 206         if (rk_obj->pages)
 207                 rockchip_gem_free_iommu(rk_obj);
 208         else
 209                 rockchip_gem_free_dma(rk_obj);
 210 }
 211 
 212 static int rockchip_drm_gem_object_mmap_iommu(struct drm_gem_object *obj,
 213                                               struct vm_area_struct *vma)
 214 {
 215         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 216         unsigned int count = obj->size >> PAGE_SHIFT;
 217         unsigned long user_count = vma_pages(vma);
 218 
 219         if (user_count == 0)
 220                 return -ENXIO;
 221 
 222         return vm_map_pages(vma, rk_obj->pages, count);
 223 }
 224 
 225 static int rockchip_drm_gem_object_mmap_dma(struct drm_gem_object *obj,
 226                                             struct vm_area_struct *vma)
 227 {
 228         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 229         struct drm_device *drm = obj->dev;
 230 
 231         return dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
 232                               obj->size, rk_obj->dma_attrs);
 233 }
 234 
 235 static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
 236                                         struct vm_area_struct *vma)
 237 {
 238         int ret;
 239         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 240 
 241         /*
 242          * We allocated a struct page table for rk_obj, so clear
 243          * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
 244          */
 245         vma->vm_flags &= ~VM_PFNMAP;
 246 
 247         if (rk_obj->pages)
 248                 ret = rockchip_drm_gem_object_mmap_iommu(obj, vma);
 249         else
 250                 ret = rockchip_drm_gem_object_mmap_dma(obj, vma);
 251 
 252         if (ret)
 253                 drm_gem_vm_close(vma);
 254 
 255         return ret;
 256 }
 257 
 258 int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
 259                           struct vm_area_struct *vma)
 260 {
 261         int ret;
 262 
 263         ret = drm_gem_mmap_obj(obj, obj->size, vma);
 264         if (ret)
 265                 return ret;
 266 
 267         return rockchip_drm_gem_object_mmap(obj, vma);
 268 }
 269 
 270 /* drm driver mmap file operations */
 271 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 272 {
 273         struct drm_gem_object *obj;
 274         int ret;
 275 
 276         ret = drm_gem_mmap(filp, vma);
 277         if (ret)
 278                 return ret;
 279 
 280         /*
 281          * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
 282          * whole buffer from the start.
 283          */
 284         vma->vm_pgoff = 0;
 285 
 286         obj = vma->vm_private_data;
 287 
 288         return rockchip_drm_gem_object_mmap(obj, vma);
 289 }
 290 
 291 static void rockchip_gem_release_object(struct rockchip_gem_object *rk_obj)
 292 {
 293         drm_gem_object_release(&rk_obj->base);
 294         kfree(rk_obj);
 295 }
 296 
 297 struct rockchip_gem_object *
 298         rockchip_gem_alloc_object(struct drm_device *drm, unsigned int size)
 299 {
 300         struct rockchip_gem_object *rk_obj;
 301         struct drm_gem_object *obj;
 302 
 303         size = round_up(size, PAGE_SIZE);
 304 
 305         rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
 306         if (!rk_obj)
 307                 return ERR_PTR(-ENOMEM);
 308 
 309         obj = &rk_obj->base;
 310 
 311         drm_gem_object_init(drm, obj, size);
 312 
 313         return rk_obj;
 314 }
 315 
 316 struct rockchip_gem_object *
 317 rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
 318                            bool alloc_kmap)
 319 {
 320         struct rockchip_gem_object *rk_obj;
 321         int ret;
 322 
 323         rk_obj = rockchip_gem_alloc_object(drm, size);
 324         if (IS_ERR(rk_obj))
 325                 return rk_obj;
 326 
 327         ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
 328         if (ret)
 329                 goto err_free_rk_obj;
 330 
 331         return rk_obj;
 332 
 333 err_free_rk_obj:
 334         rockchip_gem_release_object(rk_obj);
 335         return ERR_PTR(ret);
 336 }
 337 
 338 /*
 339  * rockchip_gem_free_object - (struct drm_driver)->gem_free_object_unlocked
 340  * callback function
 341  */
 342 void rockchip_gem_free_object(struct drm_gem_object *obj)
 343 {
 344         struct drm_device *drm = obj->dev;
 345         struct rockchip_drm_private *private = drm->dev_private;
 346         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 347 
 348         if (obj->import_attach) {
 349                 if (private->domain) {
 350                         rockchip_gem_iommu_unmap(rk_obj);
 351                 } else {
 352                         dma_unmap_sg(drm->dev, rk_obj->sgt->sgl,
 353                                      rk_obj->sgt->nents, DMA_BIDIRECTIONAL);
 354                 }
 355                 drm_prime_gem_destroy(obj, rk_obj->sgt);
 356         } else {
 357                 rockchip_gem_free_buf(rk_obj);
 358         }
 359 
 360         rockchip_gem_release_object(rk_obj);
 361 }
 362 
 363 /*
 364  * rockchip_gem_create_with_handle - allocate an object with the given
 365  * size and create a gem handle on it
 366  *
 367  * returns a struct rockchip_gem_object* on success or ERR_PTR values
 368  * on failure.
 369  */
 370 static struct rockchip_gem_object *
 371 rockchip_gem_create_with_handle(struct drm_file *file_priv,
 372                                 struct drm_device *drm, unsigned int size,
 373                                 unsigned int *handle)
 374 {
 375         struct rockchip_gem_object *rk_obj;
 376         struct drm_gem_object *obj;
 377         int ret;
 378 
 379         rk_obj = rockchip_gem_create_object(drm, size, false);
 380         if (IS_ERR(rk_obj))
 381                 return ERR_CAST(rk_obj);
 382 
 383         obj = &rk_obj->base;
 384 
 385         /*
 386          * allocate a id of idr table where the obj is registered
 387          * and handle has the id what user can see.
 388          */
 389         ret = drm_gem_handle_create(file_priv, obj, handle);
 390         if (ret)
 391                 goto err_handle_create;
 392 
 393         /* drop reference from allocate - handle holds it now. */
 394         drm_gem_object_put_unlocked(obj);
 395 
 396         return rk_obj;
 397 
 398 err_handle_create:
 399         rockchip_gem_free_object(obj);
 400 
 401         return ERR_PTR(ret);
 402 }
 403 
 404 /*
 405  * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
 406  * function
 407  *
 408  * This aligns the pitch and size arguments to the minimum required. wrap
 409  * this into your own function if you need bigger alignment.
 410  */
 411 int rockchip_gem_dumb_create(struct drm_file *file_priv,
 412                              struct drm_device *dev,
 413                              struct drm_mode_create_dumb *args)
 414 {
 415         struct rockchip_gem_object *rk_obj;
 416         int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 417 
 418         /*
 419          * align to 64 bytes since Mali requires it.
 420          */
 421         args->pitch = ALIGN(min_pitch, 64);
 422         args->size = args->pitch * args->height;
 423 
 424         rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
 425                                                  &args->handle);
 426 
 427         return PTR_ERR_OR_ZERO(rk_obj);
 428 }
 429 
 430 /*
 431  * Allocate a sg_table for this GEM object.
 432  * Note: Both the table's contents, and the sg_table itself must be freed by
 433  *       the caller.
 434  * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
 435  */
 436 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
 437 {
 438         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 439         struct drm_device *drm = obj->dev;
 440         struct sg_table *sgt;
 441         int ret;
 442 
 443         if (rk_obj->pages)
 444                 return drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages);
 445 
 446         sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
 447         if (!sgt)
 448                 return ERR_PTR(-ENOMEM);
 449 
 450         ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
 451                                     rk_obj->dma_addr, obj->size,
 452                                     rk_obj->dma_attrs);
 453         if (ret) {
 454                 DRM_ERROR("failed to allocate sgt, %d\n", ret);
 455                 kfree(sgt);
 456                 return ERR_PTR(ret);
 457         }
 458 
 459         return sgt;
 460 }
 461 
 462 static unsigned long rockchip_sg_get_contiguous_size(struct sg_table *sgt,
 463                                                      int count)
 464 {
 465         struct scatterlist *s;
 466         dma_addr_t expected = sg_dma_address(sgt->sgl);
 467         unsigned int i;
 468         unsigned long size = 0;
 469 
 470         for_each_sg(sgt->sgl, s, count, i) {
 471                 if (sg_dma_address(s) != expected)
 472                         break;
 473                 expected = sg_dma_address(s) + sg_dma_len(s);
 474                 size += sg_dma_len(s);
 475         }
 476         return size;
 477 }
 478 
 479 static int
 480 rockchip_gem_iommu_map_sg(struct drm_device *drm,
 481                           struct dma_buf_attachment *attach,
 482                           struct sg_table *sg,
 483                           struct rockchip_gem_object *rk_obj)
 484 {
 485         rk_obj->sgt = sg;
 486         return rockchip_gem_iommu_map(rk_obj);
 487 }
 488 
 489 static int
 490 rockchip_gem_dma_map_sg(struct drm_device *drm,
 491                         struct dma_buf_attachment *attach,
 492                         struct sg_table *sg,
 493                         struct rockchip_gem_object *rk_obj)
 494 {
 495         int count = dma_map_sg(drm->dev, sg->sgl, sg->nents,
 496                                DMA_BIDIRECTIONAL);
 497         if (!count)
 498                 return -EINVAL;
 499 
 500         if (rockchip_sg_get_contiguous_size(sg, count) < attach->dmabuf->size) {
 501                 DRM_ERROR("failed to map sg_table to contiguous linear address.\n");
 502                 dma_unmap_sg(drm->dev, sg->sgl, sg->nents,
 503                              DMA_BIDIRECTIONAL);
 504                 return -EINVAL;
 505         }
 506 
 507         rk_obj->dma_addr = sg_dma_address(sg->sgl);
 508         rk_obj->sgt = sg;
 509         return 0;
 510 }
 511 
 512 struct drm_gem_object *
 513 rockchip_gem_prime_import_sg_table(struct drm_device *drm,
 514                                    struct dma_buf_attachment *attach,
 515                                    struct sg_table *sg)
 516 {
 517         struct rockchip_drm_private *private = drm->dev_private;
 518         struct rockchip_gem_object *rk_obj;
 519         int ret;
 520 
 521         rk_obj = rockchip_gem_alloc_object(drm, attach->dmabuf->size);
 522         if (IS_ERR(rk_obj))
 523                 return ERR_CAST(rk_obj);
 524 
 525         if (private->domain)
 526                 ret = rockchip_gem_iommu_map_sg(drm, attach, sg, rk_obj);
 527         else
 528                 ret = rockchip_gem_dma_map_sg(drm, attach, sg, rk_obj);
 529 
 530         if (ret < 0) {
 531                 DRM_ERROR("failed to import sg table: %d\n", ret);
 532                 goto err_free_rk_obj;
 533         }
 534 
 535         return &rk_obj->base;
 536 
 537 err_free_rk_obj:
 538         rockchip_gem_release_object(rk_obj);
 539         return ERR_PTR(ret);
 540 }
 541 
 542 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
 543 {
 544         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 545 
 546         if (rk_obj->pages)
 547                 return vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
 548                             pgprot_writecombine(PAGE_KERNEL));
 549 
 550         if (rk_obj->dma_attrs & DMA_ATTR_NO_KERNEL_MAPPING)
 551                 return NULL;
 552 
 553         return rk_obj->kvaddr;
 554 }
 555 
 556 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
 557 {
 558         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 559 
 560         if (rk_obj->pages) {
 561                 vunmap(vaddr);
 562                 return;
 563         }
 564 
 565         /* Nothing to do if allocated by DMA mapping API. */
 566 }