drivers/gpu/drm/rockchip/rockchip_drm_gem.c

   1 /*
   2  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
   3  * Author:Mark Yao <mark.yao@rock-chips.com>
   4  *
   5  * This software is licensed under the terms of the GNU General Public
   6  * License version 2, as published by the Free Software Foundation, and
   7  * may be copied, distributed, and modified under those terms.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <drm/drm.h>
  16 #include <drm/drmP.h>
  17 #include <drm/drm_gem.h>
  18 #include <drm/drm_vma_manager.h>
  19
  20 #include <linux/dma-buf.h>
  21 #include <linux/iommu.h>
  22
  23 #include "rockchip_drm_drv.h"
  24 #include "rockchip_drm_gem.h"
  25
  26 static int rockchip_gem_iommu_map(struct rockchip_gem_object *rk_obj)
  27 {
  28         struct drm_device *drm = rk_obj->base.dev;
  29         struct rockchip_drm_private *private = drm->dev_private;
  30         int prot = IOMMU_READ | IOMMU_WRITE;
  31         ssize_t ret;
  32
  33         mutex_lock(&private->mm_lock);
  34         ret = drm_mm_insert_node_generic(&private->mm, &rk_obj->mm,
  35                                          rk_obj->base.size, PAGE_SIZE,
  36                                          0, 0);
  37         mutex_unlock(&private->mm_lock);
  38
  39         if (ret < 0) {
  40                 DRM_ERROR("out of I/O virtual memory: %zd\n", ret);
  41                 return ret;
  42         }
  43
  44         rk_obj->dma_addr = rk_obj->mm.start;
  45
  46         ret = iommu_map_sg(private->domain, rk_obj->dma_addr, rk_obj->sgt->sgl,
  47                            rk_obj->sgt->nents, prot);
  48         if (ret < rk_obj->base.size) {
  49                 DRM_ERROR("failed to map buffer: size=%zd request_size=%zd\n",
  50                           ret, rk_obj->base.size);
  51                 ret = -ENOMEM;
  52                 goto err_remove_node;
  53         }
  54
  55         rk_obj->size = ret;
  56
  57         return 0;
  58
  59 err_remove_node:
  60         mutex_lock(&private->mm_lock);
  61         drm_mm_remove_node(&rk_obj->mm);
  62         mutex_unlock(&private->mm_lock);
  63
  64         return ret;
  65 }
  66
  67 static int rockchip_gem_iommu_unmap(struct rockchip_gem_object *rk_obj)
  68 {
  69         struct drm_device *drm = rk_obj->base.dev;
  70         struct rockchip_drm_private *private = drm->dev_private;
  71
  72         iommu_unmap(private->domain, rk_obj->dma_addr, rk_obj->size);
  73
  74         mutex_lock(&private->mm_lock);
  75
  76         drm_mm_remove_node(&rk_obj->mm);
  77
  78         mutex_unlock(&private->mm_lock);
  79
  80         return 0;
  81 }
  82
  83 static int rockchip_gem_get_pages(struct rockchip_gem_object *rk_obj)
  84 {
  85         struct drm_device *drm = rk_obj->base.dev;
  86         int ret, i;
  87         struct scatterlist *s;
  88
  89         rk_obj->pages = drm_gem_get_pages(&rk_obj->base);
  90         if (IS_ERR(rk_obj->pages))
  91                 return PTR_ERR(rk_obj->pages);
  92
  93         rk_obj->num_pages = rk_obj->base.size >> PAGE_SHIFT;
  94
  95         rk_obj->sgt = drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages);
  96         if (IS_ERR(rk_obj->sgt)) {
  97                 ret = PTR_ERR(rk_obj->sgt);
  98                 goto err_put_pages;
  99         }
 100
 101         /*
 102          * Fake up the SG table so that dma_sync_sg_for_device() can be used
 103          * to flush the pages associated with it.
 104          *
 105          * TODO: Replace this by drm_clflush_sg() once it can be implemented
 106          * without relying on symbols that are not exported.
 107          */
 108         for_each_sg(rk_obj->sgt->sgl, s, rk_obj->sgt->nents, i)
 109                 sg_dma_address(s) = sg_phys(s);
 110
 111         dma_sync_sg_for_device(drm->dev, rk_obj->sgt->sgl, rk_obj->sgt->nents,
 112                                DMA_TO_DEVICE);
 113
 114         return 0;
 115
 116 err_put_pages:
 117         drm_gem_put_pages(&rk_obj->base, rk_obj->pages, false, false);
 118         return ret;
 119 }
 120
 121 static void rockchip_gem_put_pages(struct rockchip_gem_object *rk_obj)
 122 {
 123         sg_free_table(rk_obj->sgt);
 124         kfree(rk_obj->sgt);
 125         drm_gem_put_pages(&rk_obj->base, rk_obj->pages, true, true);
 126 }
 127
 128 static int rockchip_gem_alloc_iommu(struct rockchip_gem_object *rk_obj,
 129                                     bool alloc_kmap)
 130 {
 131         int ret;
 132
 133         ret = rockchip_gem_get_pages(rk_obj);
 134         if (ret < 0)
 135                 return ret;
 136
 137         ret = rockchip_gem_iommu_map(rk_obj);
 138         if (ret < 0)
 139                 goto err_free;
 140
 141         if (alloc_kmap) {
 142                 rk_obj->kvaddr = vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
 143                                       pgprot_writecombine(PAGE_KERNEL));
 144                 if (!rk_obj->kvaddr) {
 145                         DRM_ERROR("failed to vmap() buffer\n");
 146                         ret = -ENOMEM;
 147                         goto err_unmap;
 148                 }
 149         }
 150
 151         return 0;
 152
 153 err_unmap:
 154         rockchip_gem_iommu_unmap(rk_obj);
 155 err_free:
 156         rockchip_gem_put_pages(rk_obj);
 157
 158         return ret;
 159 }
 160
 161 static int rockchip_gem_alloc_dma(struct rockchip_gem_object *rk_obj,
 162                                   bool alloc_kmap)
 163 {
 164         struct drm_gem_object *obj = &rk_obj->base;
 165         struct drm_device *drm = obj->dev;
 166
 167         rk_obj->dma_attrs = DMA_ATTR_WRITE_COMBINE;
 168
 169         if (!alloc_kmap)
 170                 rk_obj->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
 171
 172         rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
 173                                          &rk_obj->dma_addr, GFP_KERNEL,
 174                                          rk_obj->dma_attrs);
 175         if (!rk_obj->kvaddr) {
 176                 DRM_ERROR("failed to allocate %zu byte dma buffer", obj->size);
 177                 return -ENOMEM;
 178         }
 179
 180         return 0;
 181 }
 182
 183 static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
 184                                   bool alloc_kmap)
 185 {
 186         struct drm_gem_object *obj = &rk_obj->base;
 187         struct drm_device *drm = obj->dev;
 188         struct rockchip_drm_private *private = drm->dev_private;
 189
 190         if (private->domain)
 191                 return rockchip_gem_alloc_iommu(rk_obj, alloc_kmap);
 192         else
 193                 return rockchip_gem_alloc_dma(rk_obj, alloc_kmap);
 194 }
 195
 196 static void rockchip_gem_free_iommu(struct rockchip_gem_object *rk_obj)
 197 {
 198         vunmap(rk_obj->kvaddr);
 199         rockchip_gem_iommu_unmap(rk_obj);
 200         rockchip_gem_put_pages(rk_obj);
 201 }
 202
 203 static void rockchip_gem_free_dma(struct rockchip_gem_object *rk_obj)
 204 {
 205         struct drm_gem_object *obj = &rk_obj->base;
 206         struct drm_device *drm = obj->dev;
 207
 208         dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,
 209                        rk_obj->dma_attrs);
 210 }
 211
 212 static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
 213 {
 214         if (rk_obj->pages)
 215                 rockchip_gem_free_iommu(rk_obj);
 216         else
 217                 rockchip_gem_free_dma(rk_obj);
 218 }
 219
 220 static int rockchip_drm_gem_object_mmap_iommu(struct drm_gem_object *obj,
 221                                               struct vm_area_struct *vma)
 222 {
 223         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 224         unsigned int i, count = obj->size >> PAGE_SHIFT;
 225         unsigned long user_count = vma_pages(vma);
 226         unsigned long uaddr = vma->vm_start;
 227         unsigned long offset = vma->vm_pgoff;
 228         unsigned long end = user_count + offset;
 229         int ret;
 230
 231         if (user_count == 0)
 232                 return -ENXIO;
 233         if (end > count)
 234                 return -ENXIO;
 235
 236         for (i = offset; i < end; i++) {
 237                 ret = vm_insert_page(vma, uaddr, rk_obj->pages[i]);
 238                 if (ret)
 239                         return ret;
 240                 uaddr += PAGE_SIZE;
 241         }
 242
 243         return 0;
 244 }
 245
 246 static int rockchip_drm_gem_object_mmap_dma(struct drm_gem_object *obj,
 247                                             struct vm_area_struct *vma)
 248 {
 249         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 250         struct drm_device *drm = obj->dev;
 251
 252         return dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
 253                               obj->size, rk_obj->dma_attrs);
 254 }
 255
 256 static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
 257                                         struct vm_area_struct *vma)
 258 {
 259         int ret;
 260         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 261
 262         /*
 263          * We allocated a struct page table for rk_obj, so clear
 264          * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
 265          */
 266         vma->vm_flags &= ~VM_PFNMAP;
 267
 268         if (rk_obj->pages)
 269                 ret = rockchip_drm_gem_object_mmap_iommu(obj, vma);
 270         else
 271                 ret = rockchip_drm_gem_object_mmap_dma(obj, vma);
 272
 273         if (ret)
 274                 drm_gem_vm_close(vma);
 275
 276         return ret;
 277 }
 278
 279 int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
 280                           struct vm_area_struct *vma)
 281 {
 282         int ret;
 283
 284         ret = drm_gem_mmap_obj(obj, obj->size, vma);
 285         if (ret)
 286                 return ret;
 287
 288         return rockchip_drm_gem_object_mmap(obj, vma);
 289 }
 290
 291 /* drm driver mmap file operations */
 292 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 293 {
 294         struct drm_gem_object *obj;
 295         int ret;
 296
 297         ret = drm_gem_mmap(filp, vma);
 298         if (ret)
 299                 return ret;
 300
 301         /*
 302          * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
 303          * whole buffer from the start.
 304          */
 305         vma->vm_pgoff = 0;
 306
 307         obj = vma->vm_private_data;
 308
 309         return rockchip_drm_gem_object_mmap(obj, vma);
 310 }
 311
 312 static void rockchip_gem_release_object(struct rockchip_gem_object *rk_obj)
 313 {
 314         drm_gem_object_release(&rk_obj->base);
 315         kfree(rk_obj);
 316 }
 317
 318 struct rockchip_gem_object *
 319         rockchip_gem_alloc_object(struct drm_device *drm, unsigned int size)
 320 {
 321         struct rockchip_gem_object *rk_obj;
 322         struct drm_gem_object *obj;
 323
 324         size = round_up(size, PAGE_SIZE);
 325
 326         rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
 327         if (!rk_obj)
 328                 return ERR_PTR(-ENOMEM);
 329
 330         obj = &rk_obj->base;
 331
 332         drm_gem_object_init(drm, obj, size);
 333
 334         return rk_obj;
 335 }
 336
 337 struct rockchip_gem_object *
 338 rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
 339                            bool alloc_kmap)
 340 {
 341         struct rockchip_gem_object *rk_obj;
 342         int ret;
 343
 344         rk_obj = rockchip_gem_alloc_object(drm, size);
 345         if (IS_ERR(rk_obj))
 346                 return rk_obj;
 347
 348         ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
 349         if (ret)
 350                 goto err_free_rk_obj;
 351
 352         return rk_obj;
 353
 354 err_free_rk_obj:
 355         rockchip_gem_release_object(rk_obj);
 356         return ERR_PTR(ret);
 357 }
 358
 359 /*
 360  * rockchip_gem_free_object - (struct drm_driver)->gem_free_object_unlocked
 361  * callback function
 362  */
 363 void rockchip_gem_free_object(struct drm_gem_object *obj)
 364 {
 365         struct drm_device *drm = obj->dev;
 366         struct rockchip_drm_private *private = drm->dev_private;
 367         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 368
 369         if (obj->import_attach) {
 370                 if (private->domain) {
 371                         rockchip_gem_iommu_unmap(rk_obj);
 372                 } else {
 373                         dma_unmap_sg(drm->dev, rk_obj->sgt->sgl,
 374                                      rk_obj->sgt->nents, DMA_BIDIRECTIONAL);
 375                 }
 376                 drm_prime_gem_destroy(obj, rk_obj->sgt);
 377         } else {
 378                 rockchip_gem_free_buf(rk_obj);
 379         }
 380
 381         rockchip_gem_release_object(rk_obj);
 382 }
 383
 384 /*
 385  * rockchip_gem_create_with_handle - allocate an object with the given
 386  * size and create a gem handle on it
 387  *
 388  * returns a struct rockchip_gem_object* on success or ERR_PTR values
 389  * on failure.
 390  */
 391 static struct rockchip_gem_object *
 392 rockchip_gem_create_with_handle(struct drm_file *file_priv,
 393                                 struct drm_device *drm, unsigned int size,
 394                                 unsigned int *handle)
 395 {
 396         struct rockchip_gem_object *rk_obj;
 397         struct drm_gem_object *obj;
 398         int ret;
 399
 400         rk_obj = rockchip_gem_create_object(drm, size, false);
 401         if (IS_ERR(rk_obj))
 402                 return ERR_CAST(rk_obj);
 403
 404         obj = &rk_obj->base;
 405
 406         /*
 407          * allocate a id of idr table where the obj is registered
 408          * and handle has the id what user can see.
 409          */
 410         ret = drm_gem_handle_create(file_priv, obj, handle);
 411         if (ret)
 412                 goto err_handle_create;
 413
 414         /* drop reference from allocate - handle holds it now. */
 415         drm_gem_object_put_unlocked(obj);
 416
 417         return rk_obj;
 418
 419 err_handle_create:
 420         rockchip_gem_free_object(obj);
 421
 422         return ERR_PTR(ret);
 423 }
 424
 425 /*
 426  * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
 427  * function
 428  *
 429  * This aligns the pitch and size arguments to the minimum required. wrap
 430  * this into your own function if you need bigger alignment.
 431  */
 432 int rockchip_gem_dumb_create(struct drm_file *file_priv,
 433                              struct drm_device *dev,
 434                              struct drm_mode_create_dumb *args)
 435 {
 436         struct rockchip_gem_object *rk_obj;
 437         int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 438
 439         /*
 440          * align to 64 bytes since Mali requires it.
 441          */
 442         args->pitch = ALIGN(min_pitch, 64);
 443         args->size = args->pitch * args->height;
 444
 445         rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
 446                                                  &args->handle);
 447
 448         return PTR_ERR_OR_ZERO(rk_obj);
 449 }
 450
 451 /*
 452  * Allocate a sg_table for this GEM object.
 453  * Note: Both the table's contents, and the sg_table itself must be freed by
 454  *       the caller.
 455  * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
 456  */
 457 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
 458 {
 459         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 460         struct drm_device *drm = obj->dev;
 461         struct sg_table *sgt;
 462         int ret;
 463
 464         if (rk_obj->pages)
 465                 return drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages);
 466
 467         sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
 468         if (!sgt)
 469                 return ERR_PTR(-ENOMEM);
 470
 471         ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
 472                                     rk_obj->dma_addr, obj->size,
 473                                     rk_obj->dma_attrs);
 474         if (ret) {
 475                 DRM_ERROR("failed to allocate sgt, %d\n", ret);
 476                 kfree(sgt);
 477                 return ERR_PTR(ret);
 478         }
 479
 480         return sgt;
 481 }
 482
 483 static unsigned long rockchip_sg_get_contiguous_size(struct sg_table *sgt,
 484                                                      int count)
 485 {
 486         struct scatterlist *s;
 487         dma_addr_t expected = sg_dma_address(sgt->sgl);
 488         unsigned int i;
 489         unsigned long size = 0;
 490
 491         for_each_sg(sgt->sgl, s, count, i) {
 492                 if (sg_dma_address(s) != expected)
 493                         break;
 494                 expected = sg_dma_address(s) + sg_dma_len(s);
 495                 size += sg_dma_len(s);
 496         }
 497         return size;
 498 }
 499
 500 static int
 501 rockchip_gem_iommu_map_sg(struct drm_device *drm,
 502                           struct dma_buf_attachment *attach,
 503                           struct sg_table *sg,
 504                           struct rockchip_gem_object *rk_obj)
 505 {
 506         rk_obj->sgt = sg;
 507         return rockchip_gem_iommu_map(rk_obj);
 508 }
 509
 510 static int
 511 rockchip_gem_dma_map_sg(struct drm_device *drm,
 512                         struct dma_buf_attachment *attach,
 513                         struct sg_table *sg,
 514                         struct rockchip_gem_object *rk_obj)
 515 {
 516         int count = dma_map_sg(drm->dev, sg->sgl, sg->nents,
 517                                DMA_BIDIRECTIONAL);
 518         if (!count)
 519                 return -EINVAL;
 520
 521         if (rockchip_sg_get_contiguous_size(sg, count) < attach->dmabuf->size) {
 522                 DRM_ERROR("failed to map sg_table to contiguous linear address.\n");
 523                 dma_unmap_sg(drm->dev, sg->sgl, sg->nents,
 524                              DMA_BIDIRECTIONAL);
 525                 return -EINVAL;
 526         }
 527
 528         rk_obj->dma_addr = sg_dma_address(sg->sgl);
 529         rk_obj->sgt = sg;
 530         return 0;
 531 }
 532
 533 struct drm_gem_object *
 534 rockchip_gem_prime_import_sg_table(struct drm_device *drm,
 535                                    struct dma_buf_attachment *attach,
 536                                    struct sg_table *sg)
 537 {
 538         struct rockchip_drm_private *private = drm->dev_private;
 539         struct rockchip_gem_object *rk_obj;
 540         int ret;
 541
 542         rk_obj = rockchip_gem_alloc_object(drm, attach->dmabuf->size);
 543         if (IS_ERR(rk_obj))
 544                 return ERR_CAST(rk_obj);
 545
 546         if (private->domain)
 547                 ret = rockchip_gem_iommu_map_sg(drm, attach, sg, rk_obj);
 548         else
 549                 ret = rockchip_gem_dma_map_sg(drm, attach, sg, rk_obj);
 550
 551         if (ret < 0) {
 552                 DRM_ERROR("failed to import sg table: %d\n", ret);
 553                 goto err_free_rk_obj;
 554         }
 555
 556         return &rk_obj->base;
 557
 558 err_free_rk_obj:
 559         rockchip_gem_release_object(rk_obj);
 560         return ERR_PTR(ret);
 561 }
 562
 563 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
 564 {
 565         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 566
 567         if (rk_obj->pages)
 568                 return vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
 569                             pgprot_writecombine(PAGE_KERNEL));
 570
 571         if (rk_obj->dma_attrs & DMA_ATTR_NO_KERNEL_MAPPING)
 572                 return NULL;
 573
 574         return rk_obj->kvaddr;
 575 }
 576
 577 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
 578 {
 579         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 580
 581         if (rk_obj->pages) {
 582                 vunmap(vaddr);
 583                 return;
 584         }
 585
 586         /* Nothing to do if allocated by DMA mapping API. */
 587 }