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 int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
  58                           struct vm_area_struct *vma)
  59 {
  60         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
  61         struct drm_device *drm = obj->dev;
  62         unsigned long vm_size;
  63
  64         vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
  65         vm_size = vma->vm_end - vma->vm_start;
  66
  67         if (vm_size > obj->size)
  68                 return -EINVAL;
  69
  70         return dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
  71                              obj->size, &rk_obj->dma_attrs);
  72 }
  73
  74 /* drm driver mmap file operations */
  75 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
  76 {
  77         struct drm_file *priv = filp->private_data;
  78         struct drm_device *dev = priv->minor->dev;
  79         struct drm_gem_object *obj;
  80         struct drm_vma_offset_node *node;
  81         int ret;
  82
  83         if (drm_device_is_unplugged(dev))
  84                 return -ENODEV;
  85
  86         mutex_lock(&dev->struct_mutex);
  87
  88         node = drm_vma_offset_exact_lookup(dev->vma_offset_manager,
  89                                            vma->vm_pgoff,
  90                                            vma_pages(vma));
  91         if (!node) {
  92                 mutex_unlock(&dev->struct_mutex);
  93                 DRM_ERROR("failed to find vma node.\n");
  94                 return -EINVAL;
  95         } else if (!drm_vma_node_is_allowed(node, filp)) {
  96                 mutex_unlock(&dev->struct_mutex);
  97                 return -EACCES;
  98         }
  99
 100         obj = container_of(node, struct drm_gem_object, vma_node);
 101         ret = rockchip_gem_mmap_buf(obj, vma);
 102
 103         mutex_unlock(&dev->struct_mutex);
 104
 105         return ret;
 106 }
 107
 108 struct rockchip_gem_object *
 109         rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
 110                                    bool alloc_kmap)
 111 {
 112         struct rockchip_gem_object *rk_obj;
 113         struct drm_gem_object *obj;
 114         int ret;
 115
 116         size = round_up(size, PAGE_SIZE);
 117
 118         rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
 119         if (!rk_obj)
 120                 return ERR_PTR(-ENOMEM);
 121
 122         obj = &rk_obj->base;
 123
 124         drm_gem_private_object_init(drm, obj, size);
 125
 126         ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
 127         if (ret)
 128                 goto err_free_rk_obj;
 129
 130         return rk_obj;
 131
 132 err_free_rk_obj:
 133         kfree(rk_obj);
 134         return ERR_PTR(ret);
 135 }
 136
 137 /*
 138  * rockchip_gem_free_object - (struct drm_driver)->gem_free_object callback
 139  * function
 140  */
 141 void rockchip_gem_free_object(struct drm_gem_object *obj)
 142 {
 143         struct rockchip_gem_object *rk_obj;
 144
 145         drm_gem_free_mmap_offset(obj);
 146
 147         rk_obj = to_rockchip_obj(obj);
 148
 149         rockchip_gem_free_buf(rk_obj);
 150
 151         kfree(rk_obj);
 152 }
 153
 154 /*
 155  * rockchip_gem_create_with_handle - allocate an object with the given
 156  * size and create a gem handle on it
 157  *
 158  * returns a struct rockchip_gem_object* on success or ERR_PTR values
 159  * on failure.
 160  */
 161 static struct rockchip_gem_object *
 162 rockchip_gem_create_with_handle(struct drm_file *file_priv,
 163                                 struct drm_device *drm, unsigned int size,
 164                                 unsigned int *handle)
 165 {
 166         struct rockchip_gem_object *rk_obj;
 167         struct drm_gem_object *obj;
 168         int ret;
 169
 170         rk_obj = rockchip_gem_create_object(drm, size, false);
 171         if (IS_ERR(rk_obj))
 172                 return ERR_CAST(rk_obj);
 173
 174         obj = &rk_obj->base;
 175
 176         /*
 177          * allocate a id of idr table where the obj is registered
 178          * and handle has the id what user can see.
 179          */
 180         ret = drm_gem_handle_create(file_priv, obj, handle);
 181         if (ret)
 182                 goto err_handle_create;
 183
 184         /* drop reference from allocate - handle holds it now. */
 185         drm_gem_object_unreference_unlocked(obj);
 186
 187         return rk_obj;
 188
 189 err_handle_create:
 190         rockchip_gem_free_object(obj);
 191
 192         return ERR_PTR(ret);
 193 }
 194
 195 int rockchip_gem_dumb_map_offset(struct drm_file *file_priv,
 196                                  struct drm_device *dev, uint32_t handle,
 197                                  uint64_t *offset)
 198 {
 199         struct drm_gem_object *obj;
 200         int ret;
 201
 202         mutex_lock(&dev->struct_mutex);
 203
 204         obj = drm_gem_object_lookup(dev, file_priv, handle);
 205         if (!obj) {
 206                 DRM_ERROR("failed to lookup gem object.\n");
 207                 ret = -EINVAL;
 208                 goto unlock;
 209         }
 210
 211         ret = drm_gem_create_mmap_offset(obj);
 212         if (ret)
 213                 goto out;
 214
 215         *offset = drm_vma_node_offset_addr(&obj->vma_node);
 216         DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
 217
 218 out:
 219         drm_gem_object_unreference(obj);
 220 unlock:
 221         mutex_unlock(&dev->struct_mutex);
 222         return ret;
 223 }
 224
 225 /*
 226  * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
 227  * function
 228  *
 229  * This aligns the pitch and size arguments to the minimum required. wrap
 230  * this into your own function if you need bigger alignment.
 231  */
 232 int rockchip_gem_dumb_create(struct drm_file *file_priv,
 233                              struct drm_device *dev,
 234                              struct drm_mode_create_dumb *args)
 235 {
 236         struct rockchip_gem_object *rk_obj;
 237         int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 238
 239         /*
 240          * align to 64 bytes since Mali requires it.
 241          */
 242         min_pitch = ALIGN(min_pitch, 64);
 243
 244         if (args->pitch < min_pitch)
 245                 args->pitch = min_pitch;
 246
 247         if (args->size < args->pitch * args->height)
 248                 args->size = args->pitch * args->height;
 249
 250         rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
 251                                                  &args->handle);
 252
 253         return PTR_ERR_OR_ZERO(rk_obj);
 254 }
 255
 256 /*
 257  * Allocate a sg_table for this GEM object.
 258  * Note: Both the table's contents, and the sg_table itself must be freed by
 259  *       the caller.
 260  * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
 261  */
 262 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
 263 {
 264         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 265         struct drm_device *drm = obj->dev;
 266         struct sg_table *sgt;
 267         int ret;
 268
 269         sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
 270         if (!sgt)
 271                 return ERR_PTR(-ENOMEM);
 272
 273         ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
 274                                     rk_obj->dma_addr, obj->size,
 275                                     &rk_obj->dma_attrs);
 276         if (ret) {
 277                 DRM_ERROR("failed to allocate sgt, %d\n", ret);
 278                 kfree(sgt);
 279                 return ERR_PTR(ret);
 280         }
 281
 282         return sgt;
 283 }
 284
 285 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
 286 {
 287         struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 288
 289         if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs))
 290                 return NULL;
 291
 292         return rk_obj->kvaddr;
 293 }
 294
 295 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
 296 {
 297         /* Nothing to do */
 298 }