drm/vmwgfx/vmwgfx_ttm_glue.c

0001 // SPDX-License-Identifier: GPL-2.0 OR MIT
0002 /**************************************************************************
0003  *
0004  * Copyright 2009-2011 VMware, Inc., Palo Alto, CA., USA
0005  *
0006  * Permission is hereby granted, free of charge, to any person obtaining a
0007  * copy of this software and associated documentation files (the
0008  * "Software"), to deal in the Software without restriction, including
0009  * without limitation the rights to use, copy, modify, merge, publish,
0010  * distribute, sub license, and/or sell copies of the Software, and to
0011  * permit persons to whom the Software is furnished to do so, subject to
0012  * the following conditions:
0013  *
0014  * The above copyright notice and this permission notice (including the
0015  * next paragraph) shall be included in all copies or substantial portions
0016  * of the Software.
0017  *
0018  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0019  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0020  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
0021  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
0022  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
0023  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
0024  * USE OR OTHER DEALINGS IN THE SOFTWARE.
0025  *
0026  **************************************************************************/
0027
0028 #include "vmwgfx_drv.h"
0029
0030 static int vmw_bo_vm_lookup(struct ttm_device *bdev,
0031                    struct drm_file *filp,
0032                    unsigned long offset,
0033                    unsigned long pages,
0034                    struct ttm_buffer_object **p_bo)
0035 {
0036     struct vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev);
0037     struct drm_device *drm = &dev_priv->drm;
0038     struct drm_vma_offset_node *node;
0039     int ret;
0040
0041     *p_bo = NULL;
0042
0043     drm_vma_offset_lock_lookup(bdev->vma_manager);
0044
0045     node = drm_vma_offset_lookup_locked(bdev->vma_manager, offset, pages);
0046     if (likely(node)) {
0047         *p_bo = container_of(node, struct ttm_buffer_object,
0048                   base.vma_node);
0049         *p_bo = ttm_bo_get_unless_zero(*p_bo);
0050     }
0051
0052     drm_vma_offset_unlock_lookup(bdev->vma_manager);
0053
0054     if (!*p_bo) {
0055         drm_err(drm, "Could not find buffer object to map\n");
0056         return -EINVAL;
0057     }
0058
0059     if (!drm_vma_node_is_allowed(node, filp)) {
0060         ret = -EACCES;
0061         goto out_no_access;
0062     }
0063
0064     return 0;
0065 out_no_access:
0066     ttm_bo_put(*p_bo);
0067     return ret;
0068 }
0069
0070 int vmw_mmap(struct file *filp, struct vm_area_struct *vma)
0071 {
0072     static const struct vm_operations_struct vmw_vm_ops = {
0073         .pfn_mkwrite = vmw_bo_vm_mkwrite,
0074         .page_mkwrite = vmw_bo_vm_mkwrite,
0075         .fault = vmw_bo_vm_fault,
0076         .open = ttm_bo_vm_open,
0077         .close = ttm_bo_vm_close,
0078     };
0079     struct drm_file *file_priv = filp->private_data;
0080     struct vmw_private *dev_priv = vmw_priv(file_priv->minor->dev);
0081     struct ttm_device *bdev = &dev_priv->bdev;
0082     struct ttm_buffer_object *bo;
0083     int ret;
0084
0085     if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET_START))
0086         return -EINVAL;
0087
0088     ret = vmw_bo_vm_lookup(bdev, file_priv, vma->vm_pgoff, vma_pages(vma), &bo);
0089     if (unlikely(ret != 0))
0090         return ret;
0091
0092     ret = ttm_bo_mmap_obj(vma, bo);
0093     if (unlikely(ret != 0))
0094         goto out_unref;
0095
0096     vma->vm_ops = &vmw_vm_ops;
0097
0098     /* Use VM_PFNMAP rather than VM_MIXEDMAP if not a COW mapping */
0099     if (!is_cow_mapping(vma->vm_flags))
0100         vma->vm_flags = (vma->vm_flags & ~VM_MIXEDMAP) | VM_PFNMAP;
0101
0102     ttm_bo_put(bo); /* release extra ref taken by ttm_bo_mmap_obj() */
0103
0104     return 0;
0105
0106 out_unref:
0107     ttm_bo_put(bo);
0108     return ret;
0109 }
0110