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 	if (bo->vmap)
41 		virtio_gpu_object_kunmap(bo);
42 	drm_gem_object_release(&bo->gem_base);
43 	kfree(bo);
44 }
45 
46 static void virtio_gpu_init_ttm_placement(struct virtio_gpu_object *vgbo,
47 					  bool pinned)
48 {
49 	u32 c = 1;
50 	u32 pflag = pinned ? TTM_PL_FLAG_NO_EVICT : 0;
51 
52 	vgbo->placement.placement = &vgbo->placement_code;
53 	vgbo->placement.busy_placement = &vgbo->placement_code;
54 	vgbo->placement_code.fpfn = 0;
55 	vgbo->placement_code.lpfn = 0;
56 	vgbo->placement_code.flags =
57 		TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT | pflag;
58 	vgbo->placement.num_placement = c;
59 	vgbo->placement.num_busy_placement = c;
60 
61 }
62 
63 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
64 			     unsigned long size, bool kernel, bool pinned,
65 			     struct virtio_gpu_object **bo_ptr)
66 {
67 	struct virtio_gpu_object *bo;
68 	enum ttm_bo_type type;
69 	size_t acc_size;
70 	int ret;
71 
72 	if (kernel)
73 		type = ttm_bo_type_kernel;
74 	else
75 		type = ttm_bo_type_device;
76 	*bo_ptr = NULL;
77 
78 	acc_size = ttm_bo_dma_acc_size(&vgdev->mman.bdev, size,
79 				       sizeof(struct virtio_gpu_object));
80 
81 	bo = kzalloc(sizeof(struct virtio_gpu_object), GFP_KERNEL);
82 	if (bo == NULL)
83 		return -ENOMEM;
84 	size = roundup(size, PAGE_SIZE);
85 	ret = drm_gem_object_init(vgdev->ddev, &bo->gem_base, size);
86 	if (ret != 0) {
87 		kfree(bo);
88 		return ret;
89 	}
90 	bo->dumb = false;
91 	virtio_gpu_init_ttm_placement(bo, pinned);
92 
93 	ret = ttm_bo_init(&vgdev->mman.bdev, &bo->tbo, size, type,
94 			  &bo->placement, 0, !kernel, acc_size,
95 			  NULL, NULL, &virtio_gpu_ttm_bo_destroy);
96 	/* ttm_bo_init failure will call the destroy */
97 	if (ret != 0)
98 		return ret;
99 
100 	*bo_ptr = bo;
101 	return 0;
102 }
103 
104 void virtio_gpu_object_kunmap(struct virtio_gpu_object *bo)
105 {
106 	bo->vmap = NULL;
107 	ttm_bo_kunmap(&bo->kmap);
108 }
109 
110 int virtio_gpu_object_kmap(struct virtio_gpu_object *bo)
111 {
112 	bool is_iomem;
113 	int r;
114 
115 	WARN_ON(bo->vmap);
116 
117 	r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
118 	if (r)
119 		return r;
120 	bo->vmap = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
121 	return 0;
122 }
123 
124 int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
125 				   struct virtio_gpu_object *bo)
126 {
127 	int ret;
128 	struct page **pages = bo->tbo.ttm->pages;
129 	int nr_pages = bo->tbo.num_pages;
130 	struct ttm_operation_ctx ctx = {
131 		.interruptible = false,
132 		.no_wait_gpu = false
133 	};
134 
135 	/* wtf swapping */
136 	if (bo->pages)
137 		return 0;
138 
139 	if (bo->tbo.ttm->state == tt_unpopulated)
140 		bo->tbo.ttm->bdev->driver->ttm_tt_populate(bo->tbo.ttm, &ctx);
141 	bo->pages = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
142 	if (!bo->pages)
143 		goto out;
144 
145 	ret = sg_alloc_table_from_pages(bo->pages, pages, nr_pages, 0,
146 					nr_pages << PAGE_SHIFT, GFP_KERNEL);
147 	if (ret)
148 		goto out;
149 	return 0;
150 out:
151 	kfree(bo->pages);
152 	bo->pages = NULL;
153 	return -ENOMEM;
154 }
155 
156 void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo)
157 {
158 	sg_free_table(bo->pages);
159 	kfree(bo->pages);
160 	bo->pages = NULL;
161 }
162 
163 int virtio_gpu_object_wait(struct virtio_gpu_object *bo, bool no_wait)
164 {
165 	int r;
166 
167 	r = ttm_bo_reserve(&bo->tbo, true, no_wait, NULL);
168 	if (unlikely(r != 0))
169 		return r;
170 	r = ttm_bo_wait(&bo->tbo, true, no_wait);
171 	ttm_bo_unreserve(&bo->tbo);
172 	return r;
173 }
174 
175