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