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
  20 #include "rockchip_drm_drv.h"
  21 #include "rockchip_drm_gem.h"
  22
  23 static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
  24                                   bool alloc_kmap)
  25 {
  26         struct drm_gem_object *obj = &rk_obj->base;
  27         struct drm_device *drm = obj->dev;
  28
  29         rk_obj->dma_attrs = DMA_ATTR_WRITE_COMBINE;
  30
  31         if (!alloc_kmap)
  32                 rk_obj->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
  33
  34         rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
  35                                          &rk_obj->dma_addr, GFP_KERNEL,
  36                                          rk_obj->dma_attrs);
  37         if (!rk_obj->kvaddr) {
  38                 DRM_ERROR("failed to allocate %zu byte dma buffer", obj->size);
  39                 return -ENOMEM;
  40         }
  41
  42         return 0;
  43 }
  44
  45 static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
  46 {
  47         struct drm_gem_object *obj = &rk_obj->base;
  48         struct drm_device *drm = obj->dev;
  49
  50         dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,
  51                        rk_obj->dma_attrs);
  52 }
  53
  54 static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
  55                                         struct vm_area_struct *vma)
  56
  57 {
  58         int ret;
  59         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
  60         struct drm_device *drm = obj->dev;
  61
  62         /*
  63          * dma_alloc_attrs() allocated a struct page table for rk_obj, so clear
  64          * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
  65          */
  66         vma->vm_flags &= ~VM_PFNMAP;
  67         vma->vm_pgoff = 0;
  68
  69         ret = dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
  70                              obj->size, rk_obj->dma_attrs);
  71         if (ret)
  72                 drm_gem_vm_close(vma);
  73
  74         return ret;
  75 }
  76
  77 int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
  78                           struct vm_area_struct *vma)
  79 {
  80         int ret;
  81
  82         ret = drm_gem_mmap_obj(obj, obj->size, vma);
  83         if (ret)
  84                 return ret;
  85
  86         return rockchip_drm_gem_object_mmap(obj, vma);
  87 }
  88
  89 /* drm driver mmap file operations */
  90 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
  91 {
  92         struct drm_gem_object *obj;
  93         int ret;
  94
  95         ret = drm_gem_mmap(filp, vma);
  96         if (ret)
  97                 return ret;
  98
  99         obj = vma->vm_private_data;
 100
 101         return rockchip_drm_gem_object_mmap(obj, vma);
 102 }
 103
 104 struct rockchip_gem_object *
 105         rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
 106                                    bool alloc_kmap)
 107 {
 108         struct rockchip_gem_object *rk_obj;
 109         struct drm_gem_object *obj;
 110         int ret;
 111
 112         size = round_up(size, PAGE_SIZE);
 113
 114         rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
 115         if (!rk_obj)
 116                 return ERR_PTR(-ENOMEM);
 117
 118         obj = &rk_obj->base;
 119
 120         drm_gem_private_object_init(drm, obj, size);
 121
 122         ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
 123         if (ret)
 124                 goto err_free_rk_obj;
 125
 126         return rk_obj;
 127
 128 err_free_rk_obj:
 129         kfree(rk_obj);
 130         return ERR_PTR(ret);
 131 }
 132
 133 /*
 134  * rockchip_gem_free_object - (struct drm_driver)->gem_free_object callback
 135  * function
 136  */
 137 void rockchip_gem_free_object(struct drm_gem_object *obj)
 138 {
 139         struct rockchip_gem_object *rk_obj;
 140
 141         drm_gem_free_mmap_offset(obj);
 142
 143         rk_obj = to_rockchip_obj(obj);
 144
 145         rockchip_gem_free_buf(rk_obj);
 146
 147         kfree(rk_obj);
 148 }
 149
 150 /*
 151  * rockchip_gem_create_with_handle - allocate an object with the given
 152  * size and create a gem handle on it
 153  *
 154  * returns a struct rockchip_gem_object* on success or ERR_PTR values
 155  * on failure.
 156  */
 157 static struct rockchip_gem_object *
 158 rockchip_gem_create_with_handle(struct drm_file *file_priv,
 159                                 struct drm_device *drm, unsigned int size,
 160                                 unsigned int *handle)
 161 {
 162         struct rockchip_gem_object *rk_obj;
 163         struct drm_gem_object *obj;
 164         int ret;
 165
 166         rk_obj = rockchip_gem_create_object(drm, size, false);
 167         if (IS_ERR(rk_obj))
 168                 return ERR_CAST(rk_obj);
 169
 170         obj = &rk_obj->base;
 171
 172         /*
 173          * allocate a id of idr table where the obj is registered
 174          * and handle has the id what user can see.
 175          */
 176         ret = drm_gem_handle_create(file_priv, obj, handle);
 177         if (ret)
 178                 goto err_handle_create;
 179
 180         /* drop reference from allocate - handle holds it now. */
 181         drm_gem_object_unreference_unlocked(obj);
 182
 183         return rk_obj;
 184
 185 err_handle_create:
 186         rockchip_gem_free_object(obj);
 187
 188         return ERR_PTR(ret);
 189 }
 190
 191 int rockchip_gem_dumb_map_offset(struct drm_file *file_priv,
 192                                  struct drm_device *dev, uint32_t handle,
 193                                  uint64_t *offset)
 194 {
 195         struct drm_gem_object *obj;
 196         int ret;
 197
 198         obj = drm_gem_object_lookup(file_priv, handle);
 199         if (!obj) {
 200                 DRM_ERROR("failed to lookup gem object.\n");
 201                 return -EINVAL;
 202         }
 203
 204         ret = drm_gem_create_mmap_offset(obj);
 205         if (ret)
 206                 goto out;
 207
 208         *offset = drm_vma_node_offset_addr(&obj->vma_node);
 209         DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
 210
 211 out:
 212         drm_gem_object_unreference_unlocked(obj);
 213
 214         return 0;
 215 }
 216
 217 /*
 218  * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
 219  * function
 220  *
 221  * This aligns the pitch and size arguments to the minimum required. wrap
 222  * this into your own function if you need bigger alignment.
 223  */
 224 int rockchip_gem_dumb_create(struct drm_file *file_priv,
 225                              struct drm_device *dev,
 226                              struct drm_mode_create_dumb *args)
 227 {
 228         struct rockchip_gem_object *rk_obj;
 229         int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 230
 231         /*
 232          * align to 64 bytes since Mali requires it.
 233          */
 234         args->pitch = ALIGN(min_pitch, 64);
 235         args->size = args->pitch * args->height;
 236
 237         rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
 238                                                  &args->handle);
 239
 240         return PTR_ERR_OR_ZERO(rk_obj);
 241 }
 242
 243 /*
 244  * Allocate a sg_table for this GEM object.
 245  * Note: Both the table's contents, and the sg_table itself must be freed by
 246  *       the caller.
 247  * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
 248  */
 249 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
 250 {
 251         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 252         struct drm_device *drm = obj->dev;
 253         struct sg_table *sgt;
 254         int ret;
 255
 256         sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
 257         if (!sgt)
 258                 return ERR_PTR(-ENOMEM);
 259
 260         ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
 261                                     rk_obj->dma_addr, obj->size,
 262                                     rk_obj->dma_attrs);
 263         if (ret) {
 264                 DRM_ERROR("failed to allocate sgt, %d\n", ret);
 265                 kfree(sgt);
 266                 return ERR_PTR(ret);
 267         }
 268
 269         return sgt;
 270 }
 271
 272 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
 273 {
 274         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 275
 276         if (rk_obj->dma_attrs & DMA_ATTR_NO_KERNEL_MAPPING)
 277                 return NULL;
 278
 279         return rk_obj->kvaddr;
 280 }
 281
 282 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
 283 {
 284         /* Nothing to do */
 285 }