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