1 /*
2  * Copyright (C) 2015 Red Hat, Inc.
3  * All Rights Reserved.
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining
6  * a copy of this software and associated documentation files (the
7  * "Software"), to deal in the Software without restriction, including
8  * without limitation the rights to use, copy, modify, merge, publish,
9  * distribute, sublicense, and/or sell copies of the Software, and to
10  * permit persons to whom the Software is furnished to do so, subject to
11  * the following conditions:
12  *
13  * The above copyright notice and this permission notice (including the
14  * next paragraph) shall be included in all copies or substantial
15  * portions of the Software.
16  *
17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20  * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
21  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24  */
25 
26 #include "virtgpu_drv.h"
27 
28 static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)
29 {
30 	struct virtio_gpu_object *bo;
31 	struct virtio_gpu_device *vgdev;
32 
33 	bo = container_of(tbo, struct virtio_gpu_object, tbo);
34 	vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
35 
36 	if (bo->hw_res_handle)
37 		virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);
38 	if (bo->pages)
39 		virtio_gpu_object_free_sg_table(bo);
40 	drm_gem_object_release(&bo->gem_base);
41 	kfree(bo);
42 }
43 
44 static void virtio_gpu_init_ttm_placement(struct virtio_gpu_object *vgbo,
45 					  bool pinned)
46 {
47 	u32 c = 1;
48 	u32 pflag = pinned ? TTM_PL_FLAG_NO_EVICT : 0;
49 
50 	vgbo->placement.placement = &vgbo->placement_code;
51 	vgbo->placement.busy_placement = &vgbo->placement_code;
52 	vgbo->placement_code.fpfn = 0;
53 	vgbo->placement_code.lpfn = 0;
54 	vgbo->placement_code.flags =
55 		TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT | pflag;
56 	vgbo->placement.num_placement = c;
57 	vgbo->placement.num_busy_placement = c;
58 
59 }
60 
61 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
62 			     unsigned long size, bool kernel, bool pinned,
63 			     struct virtio_gpu_object **bo_ptr)
64 {
65 	struct virtio_gpu_object *bo;
66 	enum ttm_bo_type type;
67 	size_t acc_size;
68 	int ret;
69 
70 	if (kernel)
71 		type = ttm_bo_type_kernel;
72 	else
73 		type = ttm_bo_type_device;
74 	*bo_ptr = NULL;
75 
76 	acc_size = ttm_bo_dma_acc_size(&vgdev->mman.bdev, size,
77 				       sizeof(struct virtio_gpu_object));
78 
79 	bo = kzalloc(sizeof(struct virtio_gpu_object), GFP_KERNEL);
80 	if (bo == NULL)
81 		return -ENOMEM;
82 	size = roundup(size, PAGE_SIZE);
83 	ret = drm_gem_object_init(vgdev->ddev, &bo->gem_base, size);
84 	if (ret != 0) {
85 		kfree(bo);
86 		return ret;
87 	}
88 	bo->dumb = false;
89 	virtio_gpu_init_ttm_placement(bo, pinned);
90 
91 	ret = ttm_bo_init(&vgdev->mman.bdev, &bo->tbo, size, type,
92 			  &bo->placement, 0, !kernel, NULL, acc_size,
93 			  NULL, NULL, &virtio_gpu_ttm_bo_destroy);
94 	/* ttm_bo_init failure will call the destroy */
95 	if (ret != 0)
96 		return ret;
97 
98 	*bo_ptr = bo;
99 	return 0;
100 }
101 
102 int virtio_gpu_object_kmap(struct virtio_gpu_object *bo, void **ptr)
103 {
104 	bool is_iomem;
105 	int r;
106 
107 	if (bo->vmap) {
108 		if (ptr)
109 			*ptr = bo->vmap;
110 		return 0;
111 	}
112 	r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
113 	if (r)
114 		return r;
115 	bo->vmap = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
116 	if (ptr)
117 		*ptr = bo->vmap;
118 	return 0;
119 }
120 
121 int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
122 				   struct virtio_gpu_object *bo)
123 {
124 	int ret;
125 	struct page **pages = bo->tbo.ttm->pages;
126 	int nr_pages = bo->tbo.num_pages;
127 
128 	/* wtf swapping */
129 	if (bo->pages)
130 		return 0;
131 
132 	if (bo->tbo.ttm->state == tt_unpopulated)
133 		bo->tbo.ttm->bdev->driver->ttm_tt_populate(bo->tbo.ttm);
134 	bo->pages = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
135 	if (!bo->pages)
136 		goto out;
137 
138 	ret = sg_alloc_table_from_pages(bo->pages, pages, nr_pages, 0,
139 					nr_pages << PAGE_SHIFT, GFP_KERNEL);
140 	if (ret)
141 		goto out;
142 	return 0;
143 out:
144 	kfree(bo->pages);
145 	bo->pages = NULL;
146 	return -ENOMEM;
147 }
148 
149 void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo)
150 {
151 	sg_free_table(bo->pages);
152 	kfree(bo->pages);
153 	bo->pages = NULL;
154 }
155 
156 int virtio_gpu_object_wait(struct virtio_gpu_object *bo, bool no_wait)
157 {
158 	int r;
159 
160 	r = ttm_bo_reserve(&bo->tbo, true, no_wait, NULL);
161 	if (unlikely(r != 0))
162 		return r;
163 	r = ttm_bo_wait(&bo->tbo, true, no_wait);
164 	ttm_bo_unreserve(&bo->tbo);
165 	return r;
166 }
167 
168