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
  68         ret = dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
  69                              obj->size, rk_obj->dma_attrs);
  70         if (ret)
  71                 drm_gem_vm_close(vma);
  72
  73         return ret;
  74 }
  75
  76 int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
  77                           struct vm_area_struct *vma)
  78 {
  79         int ret;
  80
  81         ret = drm_gem_mmap_obj(obj, obj->size, vma);
  82         if (ret)
  83                 return ret;
  84
  85         return rockchip_drm_gem_object_mmap(obj, vma);
  86 }
  87
  88 /* drm driver mmap file operations */
  89 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
  90 {
  91         struct drm_gem_object *obj;
  92         int ret;
  93
  94         ret = drm_gem_mmap(filp, vma);
  95         if (ret)
  96                 return ret;
  97
  98         /*
  99          * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
 100          * whole buffer from the start.
 101          */
 102         vma->vm_pgoff = 0;
 103
 104         obj = vma->vm_private_data;
 105
 106         return rockchip_drm_gem_object_mmap(obj, vma);
 107 }
 108
 109 struct rockchip_gem_object *
 110         rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
 111                                    bool alloc_kmap)
 112 {
 113         struct rockchip_gem_object *rk_obj;
 114         struct drm_gem_object *obj;
 115         int ret;
 116
 117         size = round_up(size, PAGE_SIZE);
 118
 119         rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
 120         if (!rk_obj)
 121                 return ERR_PTR(-ENOMEM);
 122
 123         obj = &rk_obj->base;
 124
 125         drm_gem_private_object_init(drm, obj, size);
 126
 127         ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
 128         if (ret)
 129                 goto err_free_rk_obj;
 130
 131         return rk_obj;
 132
 133 err_free_rk_obj:
 134         kfree(rk_obj);
 135         return ERR_PTR(ret);
 136 }
 137
 138 /*
 139  * rockchip_gem_free_object - (struct drm_driver)->gem_free_object callback
 140  * function
 141  */
 142 void rockchip_gem_free_object(struct drm_gem_object *obj)
 143 {
 144         struct rockchip_gem_object *rk_obj;
 145
 146         drm_gem_free_mmap_offset(obj);
 147
 148         rk_obj = to_rockchip_obj(obj);
 149
 150         rockchip_gem_free_buf(rk_obj);
 151
 152         kfree(rk_obj);
 153 }
 154
 155 /*
 156  * rockchip_gem_create_with_handle - allocate an object with the given
 157  * size and create a gem handle on it
 158  *
 159  * returns a struct rockchip_gem_object* on success or ERR_PTR values
 160  * on failure.
 161  */
 162 static struct rockchip_gem_object *
 163 rockchip_gem_create_with_handle(struct drm_file *file_priv,
 164                                 struct drm_device *drm, unsigned int size,
 165                                 unsigned int *handle)
 166 {
 167         struct rockchip_gem_object *rk_obj;
 168         struct drm_gem_object *obj;
 169         int ret;
 170
 171         rk_obj = rockchip_gem_create_object(drm, size, false);
 172         if (IS_ERR(rk_obj))
 173                 return ERR_CAST(rk_obj);
 174
 175         obj = &rk_obj->base;
 176
 177         /*
 178          * allocate a id of idr table where the obj is registered
 179          * and handle has the id what user can see.
 180          */
 181         ret = drm_gem_handle_create(file_priv, obj, handle);
 182         if (ret)
 183                 goto err_handle_create;
 184
 185         /* drop reference from allocate - handle holds it now. */
 186         drm_gem_object_unreference_unlocked(obj);
 187
 188         return rk_obj;
 189
 190 err_handle_create:
 191         rockchip_gem_free_object(obj);
 192
 193         return ERR_PTR(ret);
 194 }
 195
 196 int rockchip_gem_dumb_map_offset(struct drm_file *file_priv,
 197                                  struct drm_device *dev, uint32_t handle,
 198                                  uint64_t *offset)
 199 {
 200         struct drm_gem_object *obj;
 201         int ret;
 202
 203         obj = drm_gem_object_lookup(file_priv, handle);
 204         if (!obj) {
 205                 DRM_ERROR("failed to lookup gem object.\n");
 206                 return -EINVAL;
 207         }
 208
 209         ret = drm_gem_create_mmap_offset(obj);
 210         if (ret)
 211                 goto out;
 212
 213         *offset = drm_vma_node_offset_addr(&obj->vma_node);
 214         DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
 215
 216 out:
 217         drm_gem_object_unreference_unlocked(obj);
 218
 219         return 0;
 220 }
 221
 222 /*
 223  * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
 224  * function
 225  *
 226  * This aligns the pitch and size arguments to the minimum required. wrap
 227  * this into your own function if you need bigger alignment.
 228  */
 229 int rockchip_gem_dumb_create(struct drm_file *file_priv,
 230                              struct drm_device *dev,
 231                              struct drm_mode_create_dumb *args)
 232 {
 233         struct rockchip_gem_object *rk_obj;
 234         int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 235
 236         /*
 237          * align to 64 bytes since Mali requires it.
 238          */
 239         args->pitch = ALIGN(min_pitch, 64);
 240         args->size = args->pitch * args->height;
 241
 242         rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
 243                                                  &args->handle);
 244
 245         return PTR_ERR_OR_ZERO(rk_obj);
 246 }
 247
 248 /*
 249  * Allocate a sg_table for this GEM object.
 250  * Note: Both the table's contents, and the sg_table itself must be freed by
 251  *       the caller.
 252  * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
 253  */
 254 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
 255 {
 256         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 257         struct drm_device *drm = obj->dev;
 258         struct sg_table *sgt;
 259         int ret;
 260
 261         sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
 262         if (!sgt)
 263                 return ERR_PTR(-ENOMEM);
 264
 265         ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
 266                                     rk_obj->dma_addr, obj->size,
 267                                     rk_obj->dma_attrs);
 268         if (ret) {
 269                 DRM_ERROR("failed to allocate sgt, %d\n", ret);
 270                 kfree(sgt);
 271                 return ERR_PTR(ret);
 272         }
 273
 274         return sgt;
 275 }
 276
 277 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
 278 {
 279         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 280
 281         if (rk_obj->dma_attrs & DMA_ATTR_NO_KERNEL_MAPPING)
 282                 return NULL;
 283
 284         return rk_obj->kvaddr;
 285 }
 286
 287 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
 288 {
 289         /* Nothing to do */
 290 }