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 <linux/dma-attrs.h>
  21
  22 #include "rockchip_drm_drv.h"
  23 #include "rockchip_drm_gem.h"
  24
  25 static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
  26                                   bool alloc_kmap)
  27 {
  28         struct drm_gem_object *obj = &rk_obj->base;
  29         struct drm_device *drm = obj->dev;
  30
  31         init_dma_attrs(&rk_obj->dma_attrs);
  32         dma_set_attr(DMA_ATTR_WRITE_COMBINE, &rk_obj->dma_attrs);
  33
  34         if (!alloc_kmap)
  35                 dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs);
  36
  37         rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
  38                                          &rk_obj->dma_addr, GFP_KERNEL,
  39                                          &rk_obj->dma_attrs);
  40         if (!rk_obj->kvaddr) {
  41                 DRM_ERROR("failed to allocate %#x byte dma buffer", obj->size);
  42                 return -ENOMEM;
  43         }
  44
  45         return 0;
  46 }
  47
  48 static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
  49 {
  50         struct drm_gem_object *obj = &rk_obj->base;
  51         struct drm_device *drm = obj->dev;
  52
  53         dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,
  54                        &rk_obj->dma_attrs);
  55 }
  56
  57 static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
  58                                         struct vm_area_struct *vma)
  59
  60 {
  61         int ret;
  62         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
  63         struct drm_device *drm = obj->dev;
  64
  65         /*
  66          * dma_alloc_attrs() allocated a struct page table for rk_obj, so clear
  67          * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
  68          */
  69         vma->vm_flags &= ~VM_PFNMAP;
  70
  71         ret = dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
  72                              obj->size, &rk_obj->dma_attrs);
  73         if (ret)
  74                 drm_gem_vm_close(vma);
  75
  76         return ret;
  77 }
  78
  79 int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
  80                           struct vm_area_struct *vma)
  81 {
  82         struct drm_device *drm = obj->dev;
  83         int ret;
  84
  85         mutex_lock(&drm->struct_mutex);
  86         ret = drm_gem_mmap_obj(obj, obj->size, vma);
  87         mutex_unlock(&drm->struct_mutex);
  88         if (ret)
  89                 return ret;
  90
  91         return rockchip_drm_gem_object_mmap(obj, vma);
  92 }
  93
  94 /* drm driver mmap file operations */
  95 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
  96 {
  97         struct drm_gem_object *obj;
  98         int ret;
  99
 100         ret = drm_gem_mmap(filp, vma);
 101         if (ret)
 102                 return ret;
 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         mutex_lock(&dev->struct_mutex);
 204
 205         obj = drm_gem_object_lookup(dev, file_priv, handle);
 206         if (!obj) {
 207                 DRM_ERROR("failed to lookup gem object.\n");
 208                 ret = -EINVAL;
 209                 goto unlock;
 210         }
 211
 212         ret = drm_gem_create_mmap_offset(obj);
 213         if (ret)
 214                 goto out;
 215
 216         *offset = drm_vma_node_offset_addr(&obj->vma_node);
 217         DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
 218
 219 out:
 220         drm_gem_object_unreference(obj);
 221 unlock:
 222         mutex_unlock(&dev->struct_mutex);
 223         return ret;
 224 }
 225
 226 /*
 227  * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
 228  * function
 229  *
 230  * This aligns the pitch and size arguments to the minimum required. wrap
 231  * this into your own function if you need bigger alignment.
 232  */
 233 int rockchip_gem_dumb_create(struct drm_file *file_priv,
 234                              struct drm_device *dev,
 235                              struct drm_mode_create_dumb *args)
 236 {
 237         struct rockchip_gem_object *rk_obj;
 238         int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 239
 240         /*
 241          * align to 64 bytes since Mali requires it.
 242          */
 243         min_pitch = ALIGN(min_pitch, 64);
 244
 245         if (args->pitch < min_pitch)
 246                 args->pitch = min_pitch;
 247
 248         if (args->size < args->pitch * args->height)
 249                 args->size = args->pitch * args->height;
 250
 251         rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
 252                                                  &args->handle);
 253
 254         return PTR_ERR_OR_ZERO(rk_obj);
 255 }
 256
 257 /*
 258  * Allocate a sg_table for this GEM object.
 259  * Note: Both the table's contents, and the sg_table itself must be freed by
 260  *       the caller.
 261  * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
 262  */
 263 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
 264 {
 265         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 266         struct drm_device *drm = obj->dev;
 267         struct sg_table *sgt;
 268         int ret;
 269
 270         sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
 271         if (!sgt)
 272                 return ERR_PTR(-ENOMEM);
 273
 274         ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
 275                                     rk_obj->dma_addr, obj->size,
 276                                     &rk_obj->dma_attrs);
 277         if (ret) {
 278                 DRM_ERROR("failed to allocate sgt, %d\n", ret);
 279                 kfree(sgt);
 280                 return ERR_PTR(ret);
 281         }
 282
 283         return sgt;
 284 }
 285
 286 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
 287 {
 288         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 289
 290         if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs))
 291                 return NULL;
 292
 293         return rk_obj->kvaddr;
 294 }
 295
 296 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
 297 {
 298         /* Nothing to do */
 299 }