111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0 OR MIT
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/**************************************************************************
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*
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* Copyright 2009-2011 VMware, Inc., Palo Alto, CA., USA
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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#include "vmwgfx_drv.h"
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static int vmw_bo_vm_lookup(struct ttm_device *bdev,
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struct drm_file *filp,
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unsigned long offset,
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unsigned long pages,
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struct ttm_buffer_object **p_bo)
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{
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struct vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev);
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struct drm_device *drm = &dev_priv->drm;
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struct drm_vma_offset_node *node;
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int ret;
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*p_bo = NULL;
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drm_vma_offset_lock_lookup(bdev->vma_manager);
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node = drm_vma_offset_lookup_locked(bdev->vma_manager, offset, pages);
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if (likely(node)) {
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*p_bo = container_of(node, struct ttm_buffer_object,
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base.vma_node);
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*p_bo = ttm_bo_get_unless_zero(*p_bo);
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}
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drm_vma_offset_unlock_lookup(bdev->vma_manager);
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if (!*p_bo) {
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drm_err(drm, "Could not find buffer object to map\n");
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return -EINVAL;
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}
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if (!drm_vma_node_is_allowed(node, filp)) {
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ret = -EACCES;
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goto out_no_access;
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}
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return 0;
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out_no_access:
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ttm_bo_put(*p_bo);
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return ret;
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}
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int vmw_mmap(struct file *filp, struct vm_area_struct *vma)
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{
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static const struct vm_operations_struct vmw_vm_ops = {
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.pfn_mkwrite = vmw_bo_vm_mkwrite,
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.page_mkwrite = vmw_bo_vm_mkwrite,
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.fault = vmw_bo_vm_fault,
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.open = ttm_bo_vm_open,
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.close = ttm_bo_vm_close,
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};
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struct drm_file *file_priv = filp->private_data;
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struct vmw_private *dev_priv = vmw_priv(file_priv->minor->dev);
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struct ttm_device *bdev = &dev_priv->bdev;
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struct ttm_buffer_object *bo;
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int ret;
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if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET_START))
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return -EINVAL;
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ret = vmw_bo_vm_lookup(bdev, file_priv, vma->vm_pgoff, vma_pages(vma), &bo);
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if (unlikely(ret != 0))
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return ret;
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ret = ttm_bo_mmap_obj(vma, bo);
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if (unlikely(ret != 0))
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goto out_unref;
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vma->vm_ops = &vmw_vm_ops;
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/* Use VM_PFNMAP rather than VM_MIXEDMAP if not a COW mapping */
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if (!is_cow_mapping(vma->vm_flags))
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vm_flags_mod(vma, VM_PFNMAP, VM_MIXEDMAP);
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ttm_bo_put(bo); /* release extra ref taken by ttm_bo_mmap_obj() */
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return 0;
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out_unref:
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ttm_bo_put(bo);
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return ret;
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}
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