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 #include <linux/iommu.h>
  20
  21 #include "rockchip_drm_drv.h"
  22 #include "rockchip_drm_gem.h"
  23
  24 static int rockchip_gem_iommu_map(struct rockchip_gem_object *rk_obj)
  25 {
  26         struct drm_device *drm = rk_obj->base.dev;
  27         struct rockchip_drm_private *private = drm->dev_private;
  28         int prot = IOMMU_READ | IOMMU_WRITE;
  29         ssize_t ret;
  30
  31         mutex_lock(&private->mm_lock);
  32
  33         ret = drm_mm_insert_node_generic(&private->mm, &rk_obj->mm,
  34                                          rk_obj->base.size, PAGE_SIZE,
  35                                          0, 0);
  36
  37         mutex_unlock(&private->mm_lock);
  38         if (ret < 0) {
  39                 DRM_ERROR("out of I/O virtual memory: %zd\n", ret);
  40                 return ret;
  41         }
  42
  43         rk_obj->dma_addr = rk_obj->mm.start;
  44
  45         ret = iommu_map_sg(private->domain, rk_obj->dma_addr, rk_obj->sgt->sgl,
  46                            rk_obj->sgt->nents, prot);
  47         if (ret < rk_obj->base.size) {
  48                 DRM_ERROR("failed to map buffer: size=%zd request_size=%zd\n",
  49                           ret, rk_obj->base.size);
  50                 ret = -ENOMEM;
  51                 goto err_remove_node;
  52         }
  53
  54         rk_obj->size = ret;
  55
  56         return 0;
  57
  58 err_remove_node:
  59         drm_mm_remove_node(&rk_obj->mm);
  60
  61         return ret;
  62 }
  63
  64 static int rockchip_gem_iommu_unmap(struct rockchip_gem_object *rk_obj)
  65 {
  66         struct drm_device *drm = rk_obj->base.dev;
  67         struct rockchip_drm_private *private = drm->dev_private;
  68
  69         iommu_unmap(private->domain, rk_obj->dma_addr, rk_obj->size);
  70
  71         mutex_lock(&private->mm_lock);
  72
  73         drm_mm_remove_node(&rk_obj->mm);
  74
  75         mutex_unlock(&private->mm_lock);
  76
  77         return 0;
  78 }
  79
  80 static int rockchip_gem_get_pages(struct rockchip_gem_object *rk_obj)
  81 {
  82         struct drm_device *drm = rk_obj->base.dev;
  83         int ret, i;
  84         struct scatterlist *s;
  85
  86         rk_obj->pages = drm_gem_get_pages(&rk_obj->base);
  87         if (IS_ERR(rk_obj->pages))
  88                 return PTR_ERR(rk_obj->pages);
  89
  90         rk_obj->num_pages = rk_obj->base.size >> PAGE_SHIFT;
  91
  92         rk_obj->sgt = drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages);
  93         if (IS_ERR(rk_obj->sgt)) {
  94                 ret = PTR_ERR(rk_obj->sgt);
  95                 goto err_put_pages;
  96         }
  97
  98         /*
  99          * Fake up the SG table so that dma_sync_sg_for_device() can be used
 100          * to flush the pages associated with it.
 101          *
 102          * TODO: Replace this by drm_clflush_sg() once it can be implemented
 103          * without relying on symbols that are not exported.
 104          */
 105         for_each_sg(rk_obj->sgt->sgl, s, rk_obj->sgt->nents, i)
 106                 sg_dma_address(s) = sg_phys(s);
 107
 108         dma_sync_sg_for_device(drm->dev, rk_obj->sgt->sgl, rk_obj->sgt->nents,
 109                                DMA_TO_DEVICE);
 110
 111         return 0;
 112
 113 err_put_pages:
 114         drm_gem_put_pages(&rk_obj->base, rk_obj->pages, false, false);
 115         return ret;
 116 }
 117
 118 static void rockchip_gem_put_pages(struct rockchip_gem_object *rk_obj)
 119 {
 120         sg_free_table(rk_obj->sgt);
 121         kfree(rk_obj->sgt);
 122         drm_gem_put_pages(&rk_obj->base, rk_obj->pages, true, true);
 123 }
 124
 125 static int rockchip_gem_alloc_iommu(struct rockchip_gem_object *rk_obj,
 126                                     bool alloc_kmap)
 127 {
 128         int ret;
 129
 130         ret = rockchip_gem_get_pages(rk_obj);
 131         if (ret < 0)
 132                 return ret;
 133
 134         ret = rockchip_gem_iommu_map(rk_obj);
 135         if (ret < 0)
 136                 goto err_free;
 137
 138         if (alloc_kmap) {
 139                 rk_obj->kvaddr = vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
 140                                       pgprot_writecombine(PAGE_KERNEL));
 141                 if (!rk_obj->kvaddr) {
 142                         DRM_ERROR("failed to vmap() buffer\n");
 143                         ret = -ENOMEM;
 144                         goto err_unmap;
 145                 }
 146         }
 147
 148         return 0;
 149
 150 err_unmap:
 151         rockchip_gem_iommu_unmap(rk_obj);
 152 err_free:
 153         rockchip_gem_put_pages(rk_obj);
 154
 155         return ret;
 156 }
 157
 158 static int rockchip_gem_alloc_dma(struct rockchip_gem_object *rk_obj,
 159                                   bool alloc_kmap)
 160 {
 161         struct drm_gem_object *obj = &rk_obj->base;
 162         struct drm_device *drm = obj->dev;
 163
 164         rk_obj->dma_attrs = DMA_ATTR_WRITE_COMBINE;
 165
 166         if (!alloc_kmap)
 167                 rk_obj->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
 168
 169         rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
 170                                          &rk_obj->dma_addr, GFP_KERNEL,
 171                                          rk_obj->dma_attrs);
 172         if (!rk_obj->kvaddr) {
 173                 DRM_ERROR("failed to allocate %zu byte dma buffer", obj->size);
 174                 return -ENOMEM;
 175         }
 176
 177         return 0;
 178 }
 179
 180 static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
 181                                   bool alloc_kmap)
 182 {
 183         struct drm_gem_object *obj = &rk_obj->base;
 184         struct drm_device *drm = obj->dev;
 185         struct rockchip_drm_private *private = drm->dev_private;
 186
 187         if (private->domain)
 188                 return rockchip_gem_alloc_iommu(rk_obj, alloc_kmap);
 189         else
 190                 return rockchip_gem_alloc_dma(rk_obj, alloc_kmap);
 191 }
 192
 193 static void rockchip_gem_free_iommu(struct rockchip_gem_object *rk_obj)
 194 {
 195         vunmap(rk_obj->kvaddr);
 196         rockchip_gem_iommu_unmap(rk_obj);
 197         rockchip_gem_put_pages(rk_obj);
 198 }
 199
 200 static void rockchip_gem_free_dma(struct rockchip_gem_object *rk_obj)
 201 {
 202         struct drm_gem_object *obj = &rk_obj->base;
 203         struct drm_device *drm = obj->dev;
 204
 205         dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,
 206                        rk_obj->dma_attrs);
 207 }
 208
 209 static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
 210 {
 211         if (rk_obj->pages)
 212                 rockchip_gem_free_iommu(rk_obj);
 213         else
 214                 rockchip_gem_free_dma(rk_obj);
 215 }
 216
 217 static int rockchip_drm_gem_object_mmap_iommu(struct drm_gem_object *obj,
 218                                               struct vm_area_struct *vma)
 219 {
 220         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 221         unsigned int i, count = obj->size >> PAGE_SHIFT;
 222         unsigned long user_count = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
 223         unsigned long uaddr = vma->vm_start;
 224         unsigned long offset = vma->vm_pgoff;
 225         unsigned long end = user_count + offset;
 226         int ret;
 227
 228         if (user_count == 0)
 229                 return -ENXIO;
 230         if (end > count)
 231                 return -ENXIO;
 232
 233         for (i = offset; i < end; i++) {
 234                 ret = vm_insert_page(vma, uaddr, rk_obj->pages[i]);
 235                 if (ret)
 236                         return ret;
 237                 uaddr += PAGE_SIZE;
 238         }
 239
 240         return 0;
 241 }
 242
 243 static int rockchip_drm_gem_object_mmap_dma(struct drm_gem_object *obj,
 244                                             struct vm_area_struct *vma)
 245 {
 246         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 247         struct drm_device *drm = obj->dev;
 248
 249         return dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
 250                               obj->size, rk_obj->dma_attrs);
 251 }
 252
 253 static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
 254                                         struct vm_area_struct *vma)
 255 {
 256         int ret;
 257         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 258
 259         /*
 260          * We allocated a struct page table for rk_obj, so clear
 261          * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
 262          */
 263         vma->vm_flags &= ~VM_PFNMAP;
 264         vma->vm_pgoff = 0;
 265
 266         if (rk_obj->pages)
 267                 ret = rockchip_drm_gem_object_mmap_iommu(obj, vma);
 268         else
 269                 ret = rockchip_drm_gem_object_mmap_dma(obj, vma);
 270
 271         if (ret)
 272                 drm_gem_vm_close(vma);
 273
 274         return ret;
 275 }
 276
 277 int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
 278                           struct vm_area_struct *vma)
 279 {
 280         int ret;
 281
 282         ret = drm_gem_mmap_obj(obj, obj->size, vma);
 283         if (ret)
 284                 return ret;
 285
 286         return rockchip_drm_gem_object_mmap(obj, vma);
 287 }
 288
 289 /* drm driver mmap file operations */
 290 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 291 {
 292         struct drm_gem_object *obj;
 293         int ret;
 294
 295         ret = drm_gem_mmap(filp, vma);
 296         if (ret)
 297                 return ret;
 298
 299         obj = vma->vm_private_data;
 300
 301         return rockchip_drm_gem_object_mmap(obj, vma);
 302 }
 303
 304 static void rockchip_gem_release_object(struct rockchip_gem_object *rk_obj)
 305 {
 306         drm_gem_object_release(&rk_obj->base);
 307         kfree(rk_obj);
 308 }
 309
 310 struct rockchip_gem_object *
 311         rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
 312                                    bool alloc_kmap)
 313 {
 314         struct rockchip_gem_object *rk_obj;
 315         struct drm_gem_object *obj;
 316         int ret;
 317
 318         size = round_up(size, PAGE_SIZE);
 319
 320         rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
 321         if (!rk_obj)
 322                 return ERR_PTR(-ENOMEM);
 323
 324         obj = &rk_obj->base;
 325
 326         drm_gem_object_init(drm, obj, size);
 327
 328         ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
 329         if (ret)
 330                 goto err_free_rk_obj;
 331
 332         return rk_obj;
 333
 334 err_free_rk_obj:
 335         rockchip_gem_release_object(rk_obj);
 336         return ERR_PTR(ret);
 337 }
 338
 339 /*
 340  * rockchip_gem_free_object - (struct drm_driver)->gem_free_object callback
 341  * function
 342  */
 343 void rockchip_gem_free_object(struct drm_gem_object *obj)
 344 {
 345         struct rockchip_gem_object *rk_obj;
 346
 347         rk_obj = to_rockchip_obj(obj);
 348
 349         rockchip_gem_free_buf(rk_obj);
 350
 351         rockchip_gem_release_object(rk_obj);
 352 }
 353
 354 /*
 355  * rockchip_gem_create_with_handle - allocate an object with the given
 356  * size and create a gem handle on it
 357  *
 358  * returns a struct rockchip_gem_object* on success or ERR_PTR values
 359  * on failure.
 360  */
 361 static struct rockchip_gem_object *
 362 rockchip_gem_create_with_handle(struct drm_file *file_priv,
 363                                 struct drm_device *drm, unsigned int size,
 364                                 unsigned int *handle)
 365 {
 366         struct rockchip_gem_object *rk_obj;
 367         struct drm_gem_object *obj;
 368         int ret;
 369
 370         rk_obj = rockchip_gem_create_object(drm, size, false);
 371         if (IS_ERR(rk_obj))
 372                 return ERR_CAST(rk_obj);
 373
 374         obj = &rk_obj->base;
 375
 376         /*
 377          * allocate a id of idr table where the obj is registered
 378          * and handle has the id what user can see.
 379          */
 380         ret = drm_gem_handle_create(file_priv, obj, handle);
 381         if (ret)
 382                 goto err_handle_create;
 383
 384         /* drop reference from allocate - handle holds it now. */
 385         drm_gem_object_unreference_unlocked(obj);
 386
 387         return rk_obj;
 388
 389 err_handle_create:
 390         rockchip_gem_free_object(obj);
 391
 392         return ERR_PTR(ret);
 393 }
 394
 395 int rockchip_gem_dumb_map_offset(struct drm_file *file_priv,
 396                                  struct drm_device *dev, uint32_t handle,
 397                                  uint64_t *offset)
 398 {
 399         struct drm_gem_object *obj;
 400         int ret;
 401
 402         obj = drm_gem_object_lookup(file_priv, handle);
 403         if (!obj) {
 404                 DRM_ERROR("failed to lookup gem object.\n");
 405                 return -EINVAL;
 406         }
 407
 408         ret = drm_gem_create_mmap_offset(obj);
 409         if (ret)
 410                 goto out;
 411
 412         *offset = drm_vma_node_offset_addr(&obj->vma_node);
 413         DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
 414
 415 out:
 416         drm_gem_object_unreference_unlocked(obj);
 417
 418         return 0;
 419 }
 420
 421 /*
 422  * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
 423  * function
 424  *
 425  * This aligns the pitch and size arguments to the minimum required. wrap
 426  * this into your own function if you need bigger alignment.
 427  */
 428 int rockchip_gem_dumb_create(struct drm_file *file_priv,
 429                              struct drm_device *dev,
 430                              struct drm_mode_create_dumb *args)
 431 {
 432         struct rockchip_gem_object *rk_obj;
 433         int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 434
 435         /*
 436          * align to 64 bytes since Mali requires it.
 437          */
 438         args->pitch = ALIGN(min_pitch, 64);
 439         args->size = args->pitch * args->height;
 440
 441         rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
 442                                                  &args->handle);
 443
 444         return PTR_ERR_OR_ZERO(rk_obj);
 445 }
 446
 447 /*
 448  * Allocate a sg_table for this GEM object.
 449  * Note: Both the table's contents, and the sg_table itself must be freed by
 450  *       the caller.
 451  * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
 452  */
 453 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
 454 {
 455         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 456         struct drm_device *drm = obj->dev;
 457         struct sg_table *sgt;
 458         int ret;
 459
 460         if (rk_obj->pages)
 461                 return drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages);
 462
 463         sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
 464         if (!sgt)
 465                 return ERR_PTR(-ENOMEM);
 466
 467         ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
 468                                     rk_obj->dma_addr, obj->size,
 469                                     rk_obj->dma_attrs);
 470         if (ret) {
 471                 DRM_ERROR("failed to allocate sgt, %d\n", ret);
 472                 kfree(sgt);
 473                 return ERR_PTR(ret);
 474         }
 475
 476         return sgt;
 477 }
 478
 479 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
 480 {
 481         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 482
 483         if (rk_obj->pages)
 484                 return vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
 485                             pgprot_writecombine(PAGE_KERNEL));
 486
 487         if (rk_obj->dma_attrs & DMA_ATTR_NO_KERNEL_MAPPING)
 488                 return NULL;
 489
 490         return rk_obj->kvaddr;
 491 }
 492
 493 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
 494 {
 495         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 496
 497         if (rk_obj->pages) {
 498                 vunmap(vaddr);
 499                 return;
 500         }
 501
 502         /* Nothing to do if allocated by DMA mapping API. */
 503 }