drivers/gpu/host1x/drm/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 <linux/mm.h>
  22 #include <linux/slab.h>
  23 #include <linux/mutex.h>
  24 #include <linux/export.h>
  25 #include <linux/dma-mapping.h>
  26
  27 #include <drm/drmP.h>
  28 #include <drm/drm.h>
  29
  30 #include "gem.h"
  31
  32 static inline struct tegra_bo *host1x_to_drm_bo(struct host1x_bo *bo)
  33 {
  34         return container_of(bo, struct tegra_bo, base);
  35 }
  36
  37 static void tegra_bo_put(struct host1x_bo *bo)
  38 {
  39         struct tegra_bo *obj = host1x_to_drm_bo(bo);
  40         struct drm_device *drm = obj->gem.dev;
  41
  42         mutex_lock(&drm->struct_mutex);
  43         drm_gem_object_unreference(&obj->gem);
  44         mutex_unlock(&drm->struct_mutex);
  45 }
  46
  47 static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt)
  48 {
  49         struct tegra_bo *obj = host1x_to_drm_bo(bo);
  50
  51         return obj->paddr;
  52 }
  53
  54 static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt)
  55 {
  56 }
  57
  58 static void *tegra_bo_mmap(struct host1x_bo *bo)
  59 {
  60         struct tegra_bo *obj = host1x_to_drm_bo(bo);
  61
  62         return obj->vaddr;
  63 }
  64
  65 static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
  66 {
  67 }
  68
  69 static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page)
  70 {
  71         struct tegra_bo *obj = host1x_to_drm_bo(bo);
  72
  73         return obj->vaddr + page * PAGE_SIZE;
  74 }
  75
  76 static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page,
  77                             void *addr)
  78 {
  79 }
  80
  81 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
  82 {
  83         struct tegra_bo *obj = host1x_to_drm_bo(bo);
  84         struct drm_device *drm = obj->gem.dev;
  85
  86         mutex_lock(&drm->struct_mutex);
  87         drm_gem_object_reference(&obj->gem);
  88         mutex_unlock(&drm->struct_mutex);
  89
  90         return bo;
  91 }
  92
  93 const struct host1x_bo_ops tegra_bo_ops = {
  94         .get = tegra_bo_get,
  95         .put = tegra_bo_put,
  96         .pin = tegra_bo_pin,
  97         .unpin = tegra_bo_unpin,
  98         .mmap = tegra_bo_mmap,
  99         .munmap = tegra_bo_munmap,
 100         .kmap = tegra_bo_kmap,
 101         .kunmap = tegra_bo_kunmap,
 102 };
 103
 104 static void tegra_bo_destroy(struct drm_device *drm, struct tegra_bo *bo)
 105 {
 106         dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
 107 }
 108
 109 unsigned int tegra_bo_get_mmap_offset(struct tegra_bo *bo)
 110 {
 111         return (unsigned int)bo->gem.map_list.hash.key << PAGE_SHIFT;
 112 }
 113
 114 struct tegra_bo *tegra_bo_create(struct drm_device *drm, unsigned int size)
 115 {
 116         struct tegra_bo *bo;
 117         int err;
 118
 119         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
 120         if (!bo)
 121                 return ERR_PTR(-ENOMEM);
 122
 123         host1x_bo_init(&bo->base, &tegra_bo_ops);
 124         size = round_up(size, PAGE_SIZE);
 125
 126         bo->vaddr = dma_alloc_writecombine(drm->dev, size, &bo->paddr,
 127                                            GFP_KERNEL | __GFP_NOWARN);
 128         if (!bo->vaddr) {
 129                 dev_err(drm->dev, "failed to allocate buffer with size %u\n",
 130                         size);
 131                 err = -ENOMEM;
 132                 goto err_dma;
 133         }
 134
 135         err = drm_gem_object_init(drm, &bo->gem, size);
 136         if (err)
 137                 goto err_init;
 138
 139         err = drm_gem_create_mmap_offset(&bo->gem);
 140         if (err)
 141                 goto err_mmap;
 142
 143         return bo;
 144
 145 err_mmap:
 146         drm_gem_object_release(&bo->gem);
 147 err_init:
 148         tegra_bo_destroy(drm, bo);
 149 err_dma:
 150         kfree(bo);
 151
 152         return ERR_PTR(err);
 153
 154 }
 155
 156 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
 157                                             struct drm_device *drm,
 158                                             unsigned int size,
 159                                             unsigned int *handle)
 160 {
 161         struct tegra_bo *bo;
 162         int ret;
 163
 164         bo = tegra_bo_create(drm, size);
 165         if (IS_ERR(bo))
 166                 return bo;
 167
 168         ret = drm_gem_handle_create(file, &bo->gem, handle);
 169         if (ret)
 170                 goto err;
 171
 172         drm_gem_object_unreference_unlocked(&bo->gem);
 173
 174         return bo;
 175
 176 err:
 177         tegra_bo_free_object(&bo->gem);
 178         return ERR_PTR(ret);
 179 }
 180
 181 void tegra_bo_free_object(struct drm_gem_object *gem)
 182 {
 183         struct tegra_bo *bo = to_tegra_bo(gem);
 184
 185         if (gem->map_list.map)
 186                 drm_gem_free_mmap_offset(gem);
 187
 188         drm_gem_object_release(gem);
 189         tegra_bo_destroy(gem->dev, bo);
 190
 191         kfree(bo);
 192 }
 193
 194 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
 195                          struct drm_mode_create_dumb *args)
 196 {
 197         int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 198         struct tegra_bo *bo;
 199
 200         if (args->pitch < min_pitch)
 201                 args->pitch = min_pitch;
 202
 203         if (args->size < args->pitch * args->height)
 204                 args->size = args->pitch * args->height;
 205
 206         bo = tegra_bo_create_with_handle(file, drm, args->size,
 207                                             &args->handle);
 208         if (IS_ERR(bo))
 209                 return PTR_ERR(bo);
 210
 211         return 0;
 212 }
 213
 214 int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
 215                              uint32_t handle, uint64_t *offset)
 216 {
 217         struct drm_gem_object *gem;
 218         struct tegra_bo *bo;
 219
 220         mutex_lock(&drm->struct_mutex);
 221
 222         gem = drm_gem_object_lookup(drm, file, handle);
 223         if (!gem) {
 224                 dev_err(drm->dev, "failed to lookup GEM object\n");
 225                 mutex_unlock(&drm->struct_mutex);
 226                 return -EINVAL;
 227         }
 228
 229         bo = to_tegra_bo(gem);
 230
 231         *offset = tegra_bo_get_mmap_offset(bo);
 232
 233         drm_gem_object_unreference(gem);
 234
 235         mutex_unlock(&drm->struct_mutex);
 236
 237         return 0;
 238 }
 239
 240 const struct vm_operations_struct tegra_bo_vm_ops = {
 241         .open = drm_gem_vm_open,
 242         .close = drm_gem_vm_close,
 243 };
 244
 245 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
 246 {
 247         struct drm_gem_object *gem;
 248         struct tegra_bo *bo;
 249         int ret;
 250
 251         ret = drm_gem_mmap(file, vma);
 252         if (ret)
 253                 return ret;
 254
 255         gem = vma->vm_private_data;
 256         bo = to_tegra_bo(gem);
 257
 258         ret = remap_pfn_range(vma, vma->vm_start, bo->paddr >> PAGE_SHIFT,
 259                               vma->vm_end - vma->vm_start, vma->vm_page_prot);
 260         if (ret)
 261                 drm_gem_vm_close(vma);
 262
 263         return ret;
 264 }
 265
 266 int tegra_bo_dumb_destroy(struct drm_file *file, struct drm_device *drm,
 267                           unsigned int handle)
 268 {
 269         return drm_gem_handle_delete(file, handle);
 270 }