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 
30 static struct ttm_buffer_object *vmw_bo_vm_lookup(struct ttm_device *bdev,
31 						  unsigned long offset,
32 						  unsigned long pages)
33 {
34 	struct vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev);
35 	struct drm_device *drm = &dev_priv->drm;
36 	struct drm_vma_offset_node *node;
37 	struct ttm_buffer_object *bo = NULL;
38 
39 	drm_vma_offset_lock_lookup(bdev->vma_manager);
40 
41 	node = drm_vma_offset_lookup_locked(bdev->vma_manager, offset, pages);
42 	if (likely(node)) {
43 		bo = container_of(node, struct ttm_buffer_object,
44 				  base.vma_node);
45 		bo = ttm_bo_get_unless_zero(bo);
46 	}
47 
48 	drm_vma_offset_unlock_lookup(bdev->vma_manager);
49 
50 	if (!bo)
51 		drm_err(drm, "Could not find buffer object to map\n");
52 
53 	return bo;
54 }
55 
56 int vmw_mmap(struct file *filp, struct vm_area_struct *vma)
57 {
58 	static const struct vm_operations_struct vmw_vm_ops = {
59 		.pfn_mkwrite = vmw_bo_vm_mkwrite,
60 		.page_mkwrite = vmw_bo_vm_mkwrite,
61 		.fault = vmw_bo_vm_fault,
62 		.open = ttm_bo_vm_open,
63 		.close = ttm_bo_vm_close,
64 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
65 		.huge_fault = vmw_bo_vm_huge_fault,
66 #endif
67 	};
68 	struct drm_file *file_priv = filp->private_data;
69 	struct vmw_private *dev_priv = vmw_priv(file_priv->minor->dev);
70 	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
71 	struct ttm_device *bdev = &dev_priv->bdev;
72 	struct ttm_buffer_object *bo;
73 	int ret;
74 
75 	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET_START))
76 		return -EINVAL;
77 
78 	bo = vmw_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma));
79 	if (unlikely(!bo))
80 		return -EINVAL;
81 
82 	ret = vmw_user_bo_verify_access(bo, tfile);
83 	if (unlikely(ret != 0))
84 		goto out_unref;
85 
86 	ret = ttm_bo_mmap_obj(vma, bo);
87 	if (unlikely(ret != 0))
88 		goto out_unref;
89 
90 	vma->vm_ops = &vmw_vm_ops;
91 
92 	/* Use VM_PFNMAP rather than VM_MIXEDMAP if not a COW mapping */
93 	if (!is_cow_mapping(vma->vm_flags))
94 		vma->vm_flags = (vma->vm_flags & ~VM_MIXEDMAP) | VM_PFNMAP;
95 
96 	ttm_bo_put(bo); /* release extra ref taken by ttm_bo_mmap_obj() */
97 
98 	return 0;
99 
100 out_unref:
101 	ttm_bo_put(bo);
102 	return ret;
103 }
104 
105 /* struct vmw_validation_mem callback */
106 static int vmw_vmt_reserve(struct vmw_validation_mem *m, size_t size)
107 {
108 	static struct ttm_operation_ctx ctx = {.interruptible = false,
109 					       .no_wait_gpu = false};
110 	struct vmw_private *dev_priv = container_of(m, struct vmw_private, vvm);
111 
112 	return ttm_mem_global_alloc(vmw_mem_glob(dev_priv), size, &ctx);
113 }
114 
115 /* struct vmw_validation_mem callback */
116 static void vmw_vmt_unreserve(struct vmw_validation_mem *m, size_t size)
117 {
118 	struct vmw_private *dev_priv = container_of(m, struct vmw_private, vvm);
119 
120 	return ttm_mem_global_free(vmw_mem_glob(dev_priv), size);
121 }
122 
123 /**
124  * vmw_validation_mem_init_ttm - Interface the validation memory tracker
125  * to ttm.
126  * @dev_priv: Pointer to struct vmw_private. The reason we choose a vmw private
127  * rather than a struct vmw_validation_mem is to make sure assumption in the
128  * callbacks that struct vmw_private derives from struct vmw_validation_mem
129  * holds true.
130  * @gran: The recommended allocation granularity
131  */
132 void vmw_validation_mem_init_ttm(struct vmw_private *dev_priv, size_t gran)
133 {
134 	struct vmw_validation_mem *vvm = &dev_priv->vvm;
135 
136 	vvm->reserve_mem = vmw_vmt_reserve;
137 	vvm->unreserve_mem = vmw_vmt_unreserve;
138 	vvm->gran = gran;
139 }
140