cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

vmwgfx_ttm_glue.c (3413B)

      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		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
    106out_unref:
    107	ttm_bo_put(bo);
    108	return ret;
    109}
    110