drivers/gpu/drm/tegra/gem.c

   1 /*
   2  * NVIDIA Tegra DRM GEM helper functions
   3  *
   4  * Copyright (C) 2012 Sascha Hauer, Pengutronix
   5  * Copyright (C) 2013 NVIDIA CORPORATION, All rights reserved.
   6  *
   7  * Based on the GEM/CMA helpers
   8  *
   9  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  */
  20
  21 #include <drm/tegra_drm.h>
  22
  23 #include "gem.h"
  24
  25 static inline struct tegra_bo *host1x_to_tegra_bo(struct host1x_bo *bo)
  26 {
  27         return container_of(bo, struct tegra_bo, base);
  28 }
  29
  30 static void tegra_bo_put(struct host1x_bo *bo)
  31 {
  32         struct tegra_bo *obj = host1x_to_tegra_bo(bo);
  33         struct drm_device *drm = obj->gem.dev;
  34
  35         mutex_lock(&drm->struct_mutex);
  36         drm_gem_object_unreference(&obj->gem);
  37         mutex_unlock(&drm->struct_mutex);
  38 }
  39
  40 static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt)
  41 {
  42         struct tegra_bo *obj = host1x_to_tegra_bo(bo);
  43
  44         return obj->paddr;
  45 }
  46
  47 static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt)
  48 {
  49 }
  50
  51 static void *tegra_bo_mmap(struct host1x_bo *bo)
  52 {
  53         struct tegra_bo *obj = host1x_to_tegra_bo(bo);
  54
  55         return obj->vaddr;
  56 }
  57
  58 static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
  59 {
  60 }
  61
  62 static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page)
  63 {
  64         struct tegra_bo *obj = host1x_to_tegra_bo(bo);
  65
  66         return obj->vaddr + page * PAGE_SIZE;
  67 }
  68
  69 static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page,
  70                             void *addr)
  71 {
  72 }
  73
  74 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
  75 {
  76         struct tegra_bo *obj = host1x_to_tegra_bo(bo);
  77         struct drm_device *drm = obj->gem.dev;
  78
  79         mutex_lock(&drm->struct_mutex);
  80         drm_gem_object_reference(&obj->gem);
  81         mutex_unlock(&drm->struct_mutex);
  82
  83         return bo;
  84 }
  85
  86 const struct host1x_bo_ops tegra_bo_ops = {
  87         .get = tegra_bo_get,
  88         .put = tegra_bo_put,
  89         .pin = tegra_bo_pin,
  90         .unpin = tegra_bo_unpin,
  91         .mmap = tegra_bo_mmap,
  92         .munmap = tegra_bo_munmap,
  93         .kmap = tegra_bo_kmap,
  94         .kunmap = tegra_bo_kunmap,
  95 };
  96
  97 static void tegra_bo_destroy(struct drm_device *drm, struct tegra_bo *bo)
  98 {
  99         dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
 100 }
 101
 102 struct tegra_bo *tegra_bo_create(struct drm_device *drm, unsigned int size,
 103                                  unsigned long flags)
 104 {
 105         struct tegra_bo *bo;
 106         int err;
 107
 108         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
 109         if (!bo)
 110                 return ERR_PTR(-ENOMEM);
 111
 112         host1x_bo_init(&bo->base, &tegra_bo_ops);
 113         size = round_up(size, PAGE_SIZE);
 114
 115         bo->vaddr = dma_alloc_writecombine(drm->dev, size, &bo->paddr,
 116                                            GFP_KERNEL | __GFP_NOWARN);
 117         if (!bo->vaddr) {
 118                 dev_err(drm->dev, "failed to allocate buffer with size %u\n",
 119                         size);
 120                 err = -ENOMEM;
 121                 goto err_dma;
 122         }
 123
 124         err = drm_gem_object_init(drm, &bo->gem, size);
 125         if (err)
 126                 goto err_init;
 127
 128         err = drm_gem_create_mmap_offset(&bo->gem);
 129         if (err)
 130                 goto err_mmap;
 131
 132         if (flags & DRM_TEGRA_GEM_CREATE_TILED)
 133                 bo->flags |= TEGRA_BO_TILED;
 134
 135         return bo;
 136
 137 err_mmap:
 138         drm_gem_object_release(&bo->gem);
 139 err_init:
 140         tegra_bo_destroy(drm, bo);
 141 err_dma:
 142         kfree(bo);
 143
 144         return ERR_PTR(err);
 145
 146 }
 147
 148 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
 149                                              struct drm_device *drm,
 150                                              unsigned int size,
 151                                              unsigned long flags,
 152                                              unsigned int *handle)
 153 {
 154         struct tegra_bo *bo;
 155         int ret;
 156
 157         bo = tegra_bo_create(drm, size, flags);
 158         if (IS_ERR(bo))
 159                 return bo;
 160
 161         ret = drm_gem_handle_create(file, &bo->gem, handle);
 162         if (ret)
 163                 goto err;
 164
 165         drm_gem_object_unreference_unlocked(&bo->gem);
 166
 167         return bo;
 168
 169 err:
 170         tegra_bo_free_object(&bo->gem);
 171         return ERR_PTR(ret);
 172 }
 173
 174 void tegra_bo_free_object(struct drm_gem_object *gem)
 175 {
 176         struct tegra_bo *bo = to_tegra_bo(gem);
 177
 178         drm_gem_free_mmap_offset(gem);
 179         drm_gem_object_release(gem);
 180         tegra_bo_destroy(gem->dev, bo);
 181
 182         kfree(bo);
 183 }
 184
 185 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
 186                          struct drm_mode_create_dumb *args)
 187 {
 188         int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 189         struct tegra_bo *bo;
 190
 191         if (args->pitch < min_pitch)
 192                 args->pitch = min_pitch;
 193
 194         if (args->size < args->pitch * args->height)
 195                 args->size = args->pitch * args->height;
 196
 197         bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
 198                                          &args->handle);
 199         if (IS_ERR(bo))
 200                 return PTR_ERR(bo);
 201
 202         return 0;
 203 }
 204
 205 int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
 206                              uint32_t handle, uint64_t *offset)
 207 {
 208         struct drm_gem_object *gem;
 209         struct tegra_bo *bo;
 210
 211         mutex_lock(&drm->struct_mutex);
 212
 213         gem = drm_gem_object_lookup(drm, file, handle);
 214         if (!gem) {
 215                 dev_err(drm->dev, "failed to lookup GEM object\n");
 216                 mutex_unlock(&drm->struct_mutex);
 217                 return -EINVAL;
 218         }
 219
 220         bo = to_tegra_bo(gem);
 221
 222         *offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
 223
 224         drm_gem_object_unreference(gem);
 225
 226         mutex_unlock(&drm->struct_mutex);
 227
 228         return 0;
 229 }
 230
 231 const struct vm_operations_struct tegra_bo_vm_ops = {
 232         .open = drm_gem_vm_open,
 233         .close = drm_gem_vm_close,
 234 };
 235
 236 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
 237 {
 238         struct drm_gem_object *gem;
 239         struct tegra_bo *bo;
 240         int ret;
 241
 242         ret = drm_gem_mmap(file, vma);
 243         if (ret)
 244                 return ret;
 245
 246         gem = vma->vm_private_data;
 247         bo = to_tegra_bo(gem);
 248
 249         ret = remap_pfn_range(vma, vma->vm_start, bo->paddr >> PAGE_SHIFT,
 250                               vma->vm_end - vma->vm_start, vma->vm_page_prot);
 251         if (ret)
 252                 drm_gem_vm_close(vma);
 253
 254         return ret;
 255 }