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
 30static 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;
 65out_no_access:
 66	ttm_bo_put(*p_bo);
 67	return ret;
 68}
 69
 70int 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		vm_flags_mod(vma, VM_PFNMAP, VM_MIXEDMAP);
101
102	ttm_bo_put(bo); /* release extra ref taken by ttm_bo_mmap_obj() */
103
104	return 0;
105
106out_unref:
107	ttm_bo_put(bo);
108	return ret;
109}
110