drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c

   1 // SPDX-License-Identifier: GPL-2.0 OR MIT
   2 /**************************************************************************
   3  *
   4  * Copyright 2009-2011 VMware, Inc., Palo Alto, CA., USA
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "vmwgfx_drv.h"
  29
  30 static int vmw_bo_vm_lookup(struct ttm_device *bdev,
  31                                    struct drm_file *filp,
  32                                    unsigned long offset,
  33                                    unsigned long pages,
  34                                    struct ttm_buffer_object **p_bo)
  35 {
  36         struct vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev);
  37         struct drm_device *drm = &dev_priv->drm;
  38         struct drm_vma_offset_node *node;
  39         int ret;
  40
  41         *p_bo = NULL;
  42
  43         drm_vma_offset_lock_lookup(bdev->vma_manager);
  44
  45         node = drm_vma_offset_lookup_locked(bdev->vma_manager, offset, pages);
  46         if (likely(node)) {
  47                 *p_bo = container_of(node, struct ttm_buffer_object,
  48                                   base.vma_node);
  49                 *p_bo = ttm_bo_get_unless_zero(*p_bo);
  50         }
  51
  52         drm_vma_offset_unlock_lookup(bdev->vma_manager);
  53
  54         if (!*p_bo) {
  55                 drm_err(drm, "Could not find buffer object to map\n");
  56                 return -EINVAL;
  57         }
  58
  59         if (!drm_vma_node_is_allowed(node, filp)) {
  60                 ret = -EACCES;
  61                 goto out_no_access;
  62         }
  63
  64         return 0;
  65 out_no_access:
  66         ttm_bo_put(*p_bo);
  67         return ret;
  68 }
  69
  70 int vmw_mmap(struct file *filp, struct vm_area_struct *vma)
  71 {
  72         static const struct vm_operations_struct vmw_vm_ops = {
  73                 .pfn_mkwrite = vmw_bo_vm_mkwrite,
  74                 .page_mkwrite = vmw_bo_vm_mkwrite,
  75                 .fault = vmw_bo_vm_fault,
  76                 .open = ttm_bo_vm_open,
  77                 .close = ttm_bo_vm_close,
  78         };
  79         struct drm_file *file_priv = filp->private_data;
  80         struct vmw_private *dev_priv = vmw_priv(file_priv->minor->dev);
  81         struct ttm_device *bdev = &dev_priv->bdev;
  82         struct ttm_buffer_object *bo;
  83         int ret;
  84
  85         if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET_START))
  86                 return -EINVAL;
  87
  88         ret = vmw_bo_vm_lookup(bdev, file_priv, vma->vm_pgoff, vma_pages(vma), &bo);
  89         if (unlikely(ret != 0))
  90                 return ret;
  91
  92         ret = ttm_bo_mmap_obj(vma, bo);
  93         if (unlikely(ret != 0))
  94                 goto out_unref;
  95
  96         vma->vm_ops = &vmw_vm_ops;
  97
  98         /* Use VM_PFNMAP rather than VM_MIXEDMAP if not a COW mapping */
  99         if (!is_cow_mapping(vma->vm_flags))
 100                 vma->vm_flags = (vma->vm_flags & ~VM_MIXEDMAP) | VM_PFNMAP;
 101
 102         ttm_bo_put(bo); /* release extra ref taken by ttm_bo_mmap_obj() */
 103
 104         return 0;
 105
 106 out_unref:
 107         ttm_bo_put(bo);
 108         return ret;
 109 }
 110