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 count = obj->size >> PAGE_SHIFT;
 225         unsigned long user_count = vma_pages(vma);
 226
 227         if (user_count == 0)
 228                 return -ENXIO;
 229
 230         return vm_map_pages(vma, rk_obj->pages, count);
 231 }
 232
 233 static int rockchip_drm_gem_object_mmap_dma(struct drm_gem_object *obj,
 234                                             struct vm_area_struct *vma)
 235 {
 236         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 237         struct drm_device *drm = obj->dev;
 238
 239         return dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
 240                               obj->size, rk_obj->dma_attrs);
 241 }
 242
 243 static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
 244                                         struct vm_area_struct *vma)
 245 {
 246         int ret;
 247         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 248
 249         /*
 250          * We allocated a struct page table for rk_obj, so clear
 251          * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
 252          */
 253         vma->vm_flags &= ~VM_PFNMAP;
 254
 255         if (rk_obj->pages)
 256                 ret = rockchip_drm_gem_object_mmap_iommu(obj, vma);
 257         else
 258                 ret = rockchip_drm_gem_object_mmap_dma(obj, vma);
 259
 260         if (ret)
 261                 drm_gem_vm_close(vma);
 262
 263         return ret;
 264 }
 265
 266 int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
 267                           struct vm_area_struct *vma)
 268 {
 269         int ret;
 270
 271         ret = drm_gem_mmap_obj(obj, obj->size, vma);
 272         if (ret)
 273                 return ret;
 274
 275         return rockchip_drm_gem_object_mmap(obj, vma);
 276 }
 277
 278 /* drm driver mmap file operations */
 279 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 280 {
 281         struct drm_gem_object *obj;
 282         int ret;
 283
 284         ret = drm_gem_mmap(filp, vma);
 285         if (ret)
 286                 return ret;
 287
 288         /*
 289          * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
 290          * whole buffer from the start.
 291          */
 292         vma->vm_pgoff = 0;
 293
 294         obj = vma->vm_private_data;
 295
 296         return rockchip_drm_gem_object_mmap(obj, vma);
 297 }
 298
 299 static void rockchip_gem_release_object(struct rockchip_gem_object *rk_obj)
 300 {
 301         drm_gem_object_release(&rk_obj->base);
 302         kfree(rk_obj);
 303 }
 304
 305 struct rockchip_gem_object *
 306         rockchip_gem_alloc_object(struct drm_device *drm, unsigned int size)
 307 {
 308         struct rockchip_gem_object *rk_obj;
 309         struct drm_gem_object *obj;
 310
 311         size = round_up(size, PAGE_SIZE);
 312
 313         rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
 314         if (!rk_obj)
 315                 return ERR_PTR(-ENOMEM);
 316
 317         obj = &rk_obj->base;
 318
 319         drm_gem_object_init(drm, obj, size);
 320
 321         return rk_obj;
 322 }
 323
 324 struct rockchip_gem_object *
 325 rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
 326                            bool alloc_kmap)
 327 {
 328         struct rockchip_gem_object *rk_obj;
 329         int ret;
 330
 331         rk_obj = rockchip_gem_alloc_object(drm, size);
 332         if (IS_ERR(rk_obj))
 333                 return rk_obj;
 334
 335         ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
 336         if (ret)
 337                 goto err_free_rk_obj;
 338
 339         return rk_obj;
 340
 341 err_free_rk_obj:
 342         rockchip_gem_release_object(rk_obj);
 343         return ERR_PTR(ret);
 344 }
 345
 346 /*
 347  * rockchip_gem_free_object - (struct drm_driver)->gem_free_object_unlocked
 348  * callback function
 349  */
 350 void rockchip_gem_free_object(struct drm_gem_object *obj)
 351 {
 352         struct drm_device *drm = obj->dev;
 353         struct rockchip_drm_private *private = drm->dev_private;
 354         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 355
 356         if (obj->import_attach) {
 357                 if (private->domain) {
 358                         rockchip_gem_iommu_unmap(rk_obj);
 359                 } else {
 360                         dma_unmap_sg(drm->dev, rk_obj->sgt->sgl,
 361                                      rk_obj->sgt->nents, DMA_BIDIRECTIONAL);
 362                 }
 363                 drm_prime_gem_destroy(obj, rk_obj->sgt);
 364         } else {
 365                 rockchip_gem_free_buf(rk_obj);
 366         }
 367
 368         rockchip_gem_release_object(rk_obj);
 369 }
 370
 371 /*
 372  * rockchip_gem_create_with_handle - allocate an object with the given
 373  * size and create a gem handle on it
 374  *
 375  * returns a struct rockchip_gem_object* on success or ERR_PTR values
 376  * on failure.
 377  */
 378 static struct rockchip_gem_object *
 379 rockchip_gem_create_with_handle(struct drm_file *file_priv,
 380                                 struct drm_device *drm, unsigned int size,
 381                                 unsigned int *handle)
 382 {
 383         struct rockchip_gem_object *rk_obj;
 384         struct drm_gem_object *obj;
 385         int ret;
 386
 387         rk_obj = rockchip_gem_create_object(drm, size, false);
 388         if (IS_ERR(rk_obj))
 389                 return ERR_CAST(rk_obj);
 390
 391         obj = &rk_obj->base;
 392
 393         /*
 394          * allocate a id of idr table where the obj is registered
 395          * and handle has the id what user can see.
 396          */
 397         ret = drm_gem_handle_create(file_priv, obj, handle);
 398         if (ret)
 399                 goto err_handle_create;
 400
 401         /* drop reference from allocate - handle holds it now. */
 402         drm_gem_object_put_unlocked(obj);
 403
 404         return rk_obj;
 405
 406 err_handle_create:
 407         rockchip_gem_free_object(obj);
 408
 409         return ERR_PTR(ret);
 410 }
 411
 412 /*
 413  * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
 414  * function
 415  *
 416  * This aligns the pitch and size arguments to the minimum required. wrap
 417  * this into your own function if you need bigger alignment.
 418  */
 419 int rockchip_gem_dumb_create(struct drm_file *file_priv,
 420                              struct drm_device *dev,
 421                              struct drm_mode_create_dumb *args)
 422 {
 423         struct rockchip_gem_object *rk_obj;
 424         int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 425
 426         /*
 427          * align to 64 bytes since Mali requires it.
 428          */
 429         args->pitch = ALIGN(min_pitch, 64);
 430         args->size = args->pitch * args->height;
 431
 432         rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
 433                                                  &args->handle);
 434
 435         return PTR_ERR_OR_ZERO(rk_obj);
 436 }
 437
 438 /*
 439  * Allocate a sg_table for this GEM object.
 440  * Note: Both the table's contents, and the sg_table itself must be freed by
 441  *       the caller.
 442  * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
 443  */
 444 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
 445 {
 446         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 447         struct drm_device *drm = obj->dev;
 448         struct sg_table *sgt;
 449         int ret;
 450
 451         if (rk_obj->pages)
 452                 return drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages);
 453
 454         sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
 455         if (!sgt)
 456                 return ERR_PTR(-ENOMEM);
 457
 458         ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
 459                                     rk_obj->dma_addr, obj->size,
 460                                     rk_obj->dma_attrs);
 461         if (ret) {
 462                 DRM_ERROR("failed to allocate sgt, %d\n", ret);
 463                 kfree(sgt);
 464                 return ERR_PTR(ret);
 465         }
 466
 467         return sgt;
 468 }
 469
 470 static unsigned long rockchip_sg_get_contiguous_size(struct sg_table *sgt,
 471                                                      int count)
 472 {
 473         struct scatterlist *s;
 474         dma_addr_t expected = sg_dma_address(sgt->sgl);
 475         unsigned int i;
 476         unsigned long size = 0;
 477
 478         for_each_sg(sgt->sgl, s, count, i) {
 479                 if (sg_dma_address(s) != expected)
 480                         break;
 481                 expected = sg_dma_address(s) + sg_dma_len(s);
 482                 size += sg_dma_len(s);
 483         }
 484         return size;
 485 }
 486
 487 static int
 488 rockchip_gem_iommu_map_sg(struct drm_device *drm,
 489                           struct dma_buf_attachment *attach,
 490                           struct sg_table *sg,
 491                           struct rockchip_gem_object *rk_obj)
 492 {
 493         rk_obj->sgt = sg;
 494         return rockchip_gem_iommu_map(rk_obj);
 495 }
 496
 497 static int
 498 rockchip_gem_dma_map_sg(struct drm_device *drm,
 499                         struct dma_buf_attachment *attach,
 500                         struct sg_table *sg,
 501                         struct rockchip_gem_object *rk_obj)
 502 {
 503         int count = dma_map_sg(drm->dev, sg->sgl, sg->nents,
 504                                DMA_BIDIRECTIONAL);
 505         if (!count)
 506                 return -EINVAL;
 507
 508         if (rockchip_sg_get_contiguous_size(sg, count) < attach->dmabuf->size) {
 509                 DRM_ERROR("failed to map sg_table to contiguous linear address.\n");
 510                 dma_unmap_sg(drm->dev, sg->sgl, sg->nents,
 511                              DMA_BIDIRECTIONAL);
 512                 return -EINVAL;
 513         }
 514
 515         rk_obj->dma_addr = sg_dma_address(sg->sgl);
 516         rk_obj->sgt = sg;
 517         return 0;
 518 }
 519
 520 struct drm_gem_object *
 521 rockchip_gem_prime_import_sg_table(struct drm_device *drm,
 522                                    struct dma_buf_attachment *attach,
 523                                    struct sg_table *sg)
 524 {
 525         struct rockchip_drm_private *private = drm->dev_private;
 526         struct rockchip_gem_object *rk_obj;
 527         int ret;
 528
 529         rk_obj = rockchip_gem_alloc_object(drm, attach->dmabuf->size);
 530         if (IS_ERR(rk_obj))
 531                 return ERR_CAST(rk_obj);
 532
 533         if (private->domain)
 534                 ret = rockchip_gem_iommu_map_sg(drm, attach, sg, rk_obj);
 535         else
 536                 ret = rockchip_gem_dma_map_sg(drm, attach, sg, rk_obj);
 537
 538         if (ret < 0) {
 539                 DRM_ERROR("failed to import sg table: %d\n", ret);
 540                 goto err_free_rk_obj;
 541         }
 542
 543         return &rk_obj->base;
 544
 545 err_free_rk_obj:
 546         rockchip_gem_release_object(rk_obj);
 547         return ERR_PTR(ret);
 548 }
 549
 550 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
 551 {
 552         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 553
 554         if (rk_obj->pages)
 555                 return vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
 556                             pgprot_writecombine(PAGE_KERNEL));
 557
 558         if (rk_obj->dma_attrs & DMA_ATTR_NO_KERNEL_MAPPING)
 559                 return NULL;
 560
 561         return rk_obj->kvaddr;
 562 }
 563
 564 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
 565 {
 566         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 567
 568         if (rk_obj->pages) {
 569                 vunmap(vaddr);
 570                 return;
 571         }
 572
 573         /* Nothing to do if allocated by DMA mapping API. */
 574 }