drivers/gpu/drm/mediatek/mtk_drm_gem.c

   1 /*
   2  * Copyright (c) 2015 MediaTek Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <drm/drmP.h>
  15 #include <drm/drm_gem.h>
  16 #include <linux/dma-buf.h>
  17
  18 #include "mtk_drm_drv.h"
  19 #include "mtk_drm_gem.h"
  20
  21 static struct mtk_drm_gem_obj *mtk_drm_gem_init(struct drm_device *dev,
  22                                                 unsigned long size)
  23 {
  24         struct mtk_drm_gem_obj *mtk_gem_obj;
  25         int ret;
  26
  27         size = round_up(size, PAGE_SIZE);
  28
  29         mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL);
  30         if (!mtk_gem_obj)
  31                 return ERR_PTR(-ENOMEM);
  32
  33         ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size);
  34         if (ret < 0) {
  35                 DRM_ERROR("failed to initialize gem object\n");
  36                 kfree(mtk_gem_obj);
  37                 return ERR_PTR(ret);
  38         }
  39
  40         return mtk_gem_obj;
  41 }
  42
  43 struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev,
  44                                            size_t size, bool alloc_kmap)
  45 {
  46         struct mtk_drm_private *priv = dev->dev_private;
  47         struct mtk_drm_gem_obj *mtk_gem;
  48         struct drm_gem_object *obj;
  49         int ret;
  50
  51         mtk_gem = mtk_drm_gem_init(dev, size);
  52         if (IS_ERR(mtk_gem))
  53                 return ERR_CAST(mtk_gem);
  54
  55         obj = &mtk_gem->base;
  56
  57         mtk_gem->dma_attrs = DMA_ATTR_WRITE_COMBINE;
  58
  59         if (!alloc_kmap)
  60                 mtk_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
  61
  62         mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size,
  63                                           &mtk_gem->dma_addr, GFP_KERNEL,
  64                                           mtk_gem->dma_attrs);
  65         if (!mtk_gem->cookie) {
  66                 DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size);
  67                 ret = -ENOMEM;
  68                 goto err_gem_free;
  69         }
  70
  71         if (alloc_kmap)
  72                 mtk_gem->kvaddr = mtk_gem->cookie;
  73
  74         DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n",
  75                          mtk_gem->cookie, &mtk_gem->dma_addr,
  76                          size);
  77
  78         return mtk_gem;
  79
  80 err_gem_free:
  81         drm_gem_object_release(obj);
  82         kfree(mtk_gem);
  83         return ERR_PTR(ret);
  84 }
  85
  86 void mtk_drm_gem_free_object(struct drm_gem_object *obj)
  87 {
  88         struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
  89         struct mtk_drm_private *priv = obj->dev->dev_private;
  90
  91         if (mtk_gem->sg)
  92                 drm_prime_gem_destroy(obj, mtk_gem->sg);
  93         else
  94                 dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie,
  95                                mtk_gem->dma_addr, mtk_gem->dma_attrs);
  96
  97         /* release file pointer to gem object. */
  98         drm_gem_object_release(obj);
  99
 100         kfree(mtk_gem);
 101 }
 102
 103 int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
 104                             struct drm_mode_create_dumb *args)
 105 {
 106         struct mtk_drm_gem_obj *mtk_gem;
 107         int ret;
 108
 109         args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 110         args->size = args->pitch * args->height;
 111
 112         mtk_gem = mtk_drm_gem_create(dev, args->size, false);
 113         if (IS_ERR(mtk_gem))
 114                 return PTR_ERR(mtk_gem);
 115
 116         /*
 117          * allocate a id of idr table where the obj is registered
 118          * and handle has the id what user can see.
 119          */
 120         ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle);
 121         if (ret)
 122                 goto err_handle_create;
 123
 124         /* drop reference from allocate - handle holds it now. */
 125         drm_gem_object_unreference_unlocked(&mtk_gem->base);
 126
 127         return 0;
 128
 129 err_handle_create:
 130         mtk_drm_gem_free_object(&mtk_gem->base);
 131         return ret;
 132 }
 133
 134 int mtk_drm_gem_dumb_map_offset(struct drm_file *file_priv,
 135                                 struct drm_device *dev, uint32_t handle,
 136                                 uint64_t *offset)
 137 {
 138         struct drm_gem_object *obj;
 139         int ret;
 140
 141         obj = drm_gem_object_lookup(file_priv, handle);
 142         if (!obj) {
 143                 DRM_ERROR("failed to lookup gem object.\n");
 144                 return -EINVAL;
 145         }
 146
 147         ret = drm_gem_create_mmap_offset(obj);
 148         if (ret)
 149                 goto out;
 150
 151         *offset = drm_vma_node_offset_addr(&obj->vma_node);
 152         DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
 153
 154 out:
 155         drm_gem_object_unreference_unlocked(obj);
 156         return ret;
 157 }
 158
 159 static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
 160                                    struct vm_area_struct *vma)
 161
 162 {
 163         int ret;
 164         struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
 165         struct mtk_drm_private *priv = obj->dev->dev_private;
 166
 167         /*
 168          * dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear
 169          * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
 170          */
 171         vma->vm_flags &= ~VM_PFNMAP;
 172         vma->vm_pgoff = 0;
 173
 174         ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,
 175                              mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs);
 176         if (ret)
 177                 drm_gem_vm_close(vma);
 178
 179         return ret;
 180 }
 181
 182 int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj, struct vm_area_struct *vma)
 183 {
 184         int ret;
 185
 186         ret = drm_gem_mmap_obj(obj, obj->size, vma);
 187         if (ret)
 188                 return ret;
 189
 190         return mtk_drm_gem_object_mmap(obj, vma);
 191 }
 192
 193 int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 194 {
 195         struct drm_gem_object *obj;
 196         int ret;
 197
 198         ret = drm_gem_mmap(filp, vma);
 199         if (ret)
 200                 return ret;
 201
 202         obj = vma->vm_private_data;
 203
 204         return mtk_drm_gem_object_mmap(obj, vma);
 205 }
 206
 207 /*
 208  * Allocate a sg_table for this GEM object.
 209  * Note: Both the table's contents, and the sg_table itself must be freed by
 210  *       the caller.
 211  * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
 212  */
 213 struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj)
 214 {
 215         struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
 216         struct mtk_drm_private *priv = obj->dev->dev_private;
 217         struct sg_table *sgt;
 218         int ret;
 219
 220         sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
 221         if (!sgt)
 222                 return ERR_PTR(-ENOMEM);
 223
 224         ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie,
 225                                     mtk_gem->dma_addr, obj->size,
 226                                     mtk_gem->dma_attrs);
 227         if (ret) {
 228                 DRM_ERROR("failed to allocate sgt, %d\n", ret);
 229                 kfree(sgt);
 230                 return ERR_PTR(ret);
 231         }
 232
 233         return sgt;
 234 }
 235
 236 struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
 237                         struct dma_buf_attachment *attach, struct sg_table *sg)
 238 {
 239         struct mtk_drm_gem_obj *mtk_gem;
 240         int ret;
 241         struct scatterlist *s;
 242         unsigned int i;
 243         dma_addr_t expected;
 244
 245         mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size);
 246
 247         if (IS_ERR(mtk_gem))
 248                 return ERR_PTR(PTR_ERR(mtk_gem));
 249
 250         expected = sg_dma_address(sg->sgl);
 251         for_each_sg(sg->sgl, s, sg->nents, i) {
 252                 if (sg_dma_address(s) != expected) {
 253                         DRM_ERROR("sg_table is not contiguous");
 254                         ret = -EINVAL;
 255                         goto err_gem_free;
 256                 }
 257                 expected = sg_dma_address(s) + sg_dma_len(s);
 258         }
 259
 260         mtk_gem->dma_addr = sg_dma_address(sg->sgl);
 261         mtk_gem->sg = sg;
 262
 263         return &mtk_gem->base;
 264
 265 err_gem_free:
 266         kfree(mtk_gem);
 267         return ERR_PTR(ret);
 268 }