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 int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
29 				       uint32_t *resid)
30 {
31 	int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
32 
33 	if (handle < 0)
34 		return handle;
35 
36 	*resid = handle + 1;
37 	return 0;
38 }
39 
40 static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
41 {
42 	ida_free(&vgdev->resource_ida, id - 1);
43 }
44 
45 static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)
46 {
47 	struct virtio_gpu_object *bo;
48 	struct virtio_gpu_device *vgdev;
49 
50 	bo = container_of(tbo, struct virtio_gpu_object, tbo);
51 	vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
52 
53 	if (bo->created)
54 		virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);
55 	if (bo->pages)
56 		virtio_gpu_object_free_sg_table(bo);
57 	if (bo->vmap)
58 		virtio_gpu_object_kunmap(bo);
59 	drm_gem_object_release(&bo->gem_base);
60 	virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
61 	kfree(bo);
62 }
63 
64 static void virtio_gpu_init_ttm_placement(struct virtio_gpu_object *vgbo,
65 					  bool pinned)
66 {
67 	u32 c = 1;
68 	u32 pflag = pinned ? TTM_PL_FLAG_NO_EVICT : 0;
69 
70 	vgbo->placement.placement = &vgbo->placement_code;
71 	vgbo->placement.busy_placement = &vgbo->placement_code;
72 	vgbo->placement_code.fpfn = 0;
73 	vgbo->placement_code.lpfn = 0;
74 	vgbo->placement_code.flags =
75 		TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT | pflag;
76 	vgbo->placement.num_placement = c;
77 	vgbo->placement.num_busy_placement = c;
78 
79 }
80 
81 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
82 			     unsigned long size, bool kernel, bool pinned,
83 			     struct virtio_gpu_object **bo_ptr)
84 {
85 	struct virtio_gpu_object *bo;
86 	enum ttm_bo_type type;
87 	size_t acc_size;
88 	int ret;
89 
90 	if (kernel)
91 		type = ttm_bo_type_kernel;
92 	else
93 		type = ttm_bo_type_device;
94 	*bo_ptr = NULL;
95 
96 	acc_size = ttm_bo_dma_acc_size(&vgdev->mman.bdev, size,
97 				       sizeof(struct virtio_gpu_object));
98 
99 	bo = kzalloc(sizeof(struct virtio_gpu_object), GFP_KERNEL);
100 	if (bo == NULL)
101 		return -ENOMEM;
102 	ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
103 	if (ret < 0) {
104 		kfree(bo);
105 		return ret;
106 	}
107 	size = roundup(size, PAGE_SIZE);
108 	ret = drm_gem_object_init(vgdev->ddev, &bo->gem_base, size);
109 	if (ret != 0) {
110 		virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
111 		kfree(bo);
112 		return ret;
113 	}
114 	bo->dumb = false;
115 	virtio_gpu_init_ttm_placement(bo, pinned);
116 
117 	ret = ttm_bo_init(&vgdev->mman.bdev, &bo->tbo, size, type,
118 			  &bo->placement, 0, !kernel, acc_size,
119 			  NULL, NULL, &virtio_gpu_ttm_bo_destroy);
120 	/* ttm_bo_init failure will call the destroy */
121 	if (ret != 0)
122 		return ret;
123 
124 	*bo_ptr = bo;
125 	return 0;
126 }
127 
128 void virtio_gpu_object_kunmap(struct virtio_gpu_object *bo)
129 {
130 	bo->vmap = NULL;
131 	ttm_bo_kunmap(&bo->kmap);
132 }
133 
134 int virtio_gpu_object_kmap(struct virtio_gpu_object *bo)
135 {
136 	bool is_iomem;
137 	int r;
138 
139 	WARN_ON(bo->vmap);
140 
141 	r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
142 	if (r)
143 		return r;
144 	bo->vmap = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
145 	return 0;
146 }
147 
148 int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
149 				   struct virtio_gpu_object *bo)
150 {
151 	int ret;
152 	struct page **pages = bo->tbo.ttm->pages;
153 	int nr_pages = bo->tbo.num_pages;
154 	struct ttm_operation_ctx ctx = {
155 		.interruptible = false,
156 		.no_wait_gpu = false
157 	};
158 
159 	/* wtf swapping */
160 	if (bo->pages)
161 		return 0;
162 
163 	if (bo->tbo.ttm->state == tt_unpopulated)
164 		bo->tbo.ttm->bdev->driver->ttm_tt_populate(bo->tbo.ttm, &ctx);
165 	bo->pages = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
166 	if (!bo->pages)
167 		goto out;
168 
169 	ret = sg_alloc_table_from_pages(bo->pages, pages, nr_pages, 0,
170 					nr_pages << PAGE_SHIFT, GFP_KERNEL);
171 	if (ret)
172 		goto out;
173 	return 0;
174 out:
175 	kfree(bo->pages);
176 	bo->pages = NULL;
177 	return -ENOMEM;
178 }
179 
180 void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo)
181 {
182 	sg_free_table(bo->pages);
183 	kfree(bo->pages);
184 	bo->pages = NULL;
185 }
186 
187 int virtio_gpu_object_wait(struct virtio_gpu_object *bo, bool no_wait)
188 {
189 	int r;
190 
191 	r = ttm_bo_reserve(&bo->tbo, true, no_wait, NULL);
192 	if (unlikely(r != 0))
193 		return r;
194 	r = ttm_bo_wait(&bo->tbo, true, no_wait);
195 	ttm_bo_unreserve(&bo->tbo);
196 	return r;
197 }
198 
199