xref: /linux/drivers/gpu/drm/virtio/virtgpu_object.c (revision ec63e2a4897075e427c121d863bd89c44578094f)
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 #if 0
32 	int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
33 
34 	if (handle < 0)
35 		return handle;
36 #else
37 	static int handle;
38 
39 	/*
40 	 * FIXME: dirty hack to avoid re-using IDs, virglrenderer
41 	 * can't deal with that.  Needs fixing in virglrenderer, also
42 	 * should figure a better way to handle that in the guest.
43 	 */
44 	handle++;
45 #endif
46 
47 	*resid = handle + 1;
48 	return 0;
49 }
50 
51 static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
52 {
53 #if 0
54 	ida_free(&vgdev->resource_ida, id - 1);
55 #endif
56 }
57 
58 static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)
59 {
60 	struct virtio_gpu_object *bo;
61 	struct virtio_gpu_device *vgdev;
62 
63 	bo = container_of(tbo, struct virtio_gpu_object, tbo);
64 	vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
65 
66 	if (bo->created)
67 		virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);
68 	if (bo->pages)
69 		virtio_gpu_object_free_sg_table(bo);
70 	if (bo->vmap)
71 		virtio_gpu_object_kunmap(bo);
72 	drm_gem_object_release(&bo->gem_base);
73 	virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
74 	kfree(bo);
75 }
76 
77 static void virtio_gpu_init_ttm_placement(struct virtio_gpu_object *vgbo,
78 					  bool pinned)
79 {
80 	u32 c = 1;
81 	u32 pflag = pinned ? TTM_PL_FLAG_NO_EVICT : 0;
82 
83 	vgbo->placement.placement = &vgbo->placement_code;
84 	vgbo->placement.busy_placement = &vgbo->placement_code;
85 	vgbo->placement_code.fpfn = 0;
86 	vgbo->placement_code.lpfn = 0;
87 	vgbo->placement_code.flags =
88 		TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT | pflag;
89 	vgbo->placement.num_placement = c;
90 	vgbo->placement.num_busy_placement = c;
91 
92 }
93 
94 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
95 			     unsigned long size, bool kernel, bool pinned,
96 			     struct virtio_gpu_object **bo_ptr)
97 {
98 	struct virtio_gpu_object *bo;
99 	enum ttm_bo_type type;
100 	size_t acc_size;
101 	int ret;
102 
103 	if (kernel)
104 		type = ttm_bo_type_kernel;
105 	else
106 		type = ttm_bo_type_device;
107 	*bo_ptr = NULL;
108 
109 	acc_size = ttm_bo_dma_acc_size(&vgdev->mman.bdev, size,
110 				       sizeof(struct virtio_gpu_object));
111 
112 	bo = kzalloc(sizeof(struct virtio_gpu_object), GFP_KERNEL);
113 	if (bo == NULL)
114 		return -ENOMEM;
115 	ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
116 	if (ret < 0) {
117 		kfree(bo);
118 		return ret;
119 	}
120 	size = roundup(size, PAGE_SIZE);
121 	ret = drm_gem_object_init(vgdev->ddev, &bo->gem_base, size);
122 	if (ret != 0) {
123 		virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
124 		kfree(bo);
125 		return ret;
126 	}
127 	bo->dumb = false;
128 	virtio_gpu_init_ttm_placement(bo, pinned);
129 
130 	ret = ttm_bo_init(&vgdev->mman.bdev, &bo->tbo, size, type,
131 			  &bo->placement, 0, !kernel, acc_size,
132 			  NULL, NULL, &virtio_gpu_ttm_bo_destroy);
133 	/* ttm_bo_init failure will call the destroy */
134 	if (ret != 0)
135 		return ret;
136 
137 	*bo_ptr = bo;
138 	return 0;
139 }
140 
141 void virtio_gpu_object_kunmap(struct virtio_gpu_object *bo)
142 {
143 	bo->vmap = NULL;
144 	ttm_bo_kunmap(&bo->kmap);
145 }
146 
147 int virtio_gpu_object_kmap(struct virtio_gpu_object *bo)
148 {
149 	bool is_iomem;
150 	int r;
151 
152 	WARN_ON(bo->vmap);
153 
154 	r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
155 	if (r)
156 		return r;
157 	bo->vmap = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
158 	return 0;
159 }
160 
161 int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
162 				   struct virtio_gpu_object *bo)
163 {
164 	int ret;
165 	struct page **pages = bo->tbo.ttm->pages;
166 	int nr_pages = bo->tbo.num_pages;
167 	struct ttm_operation_ctx ctx = {
168 		.interruptible = false,
169 		.no_wait_gpu = false
170 	};
171 
172 	/* wtf swapping */
173 	if (bo->pages)
174 		return 0;
175 
176 	if (bo->tbo.ttm->state == tt_unpopulated)
177 		bo->tbo.ttm->bdev->driver->ttm_tt_populate(bo->tbo.ttm, &ctx);
178 	bo->pages = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
179 	if (!bo->pages)
180 		goto out;
181 
182 	ret = sg_alloc_table_from_pages(bo->pages, pages, nr_pages, 0,
183 					nr_pages << PAGE_SHIFT, GFP_KERNEL);
184 	if (ret)
185 		goto out;
186 	return 0;
187 out:
188 	kfree(bo->pages);
189 	bo->pages = NULL;
190 	return -ENOMEM;
191 }
192 
193 void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo)
194 {
195 	sg_free_table(bo->pages);
196 	kfree(bo->pages);
197 	bo->pages = NULL;
198 }
199 
200 int virtio_gpu_object_wait(struct virtio_gpu_object *bo, bool no_wait)
201 {
202 	int r;
203 
204 	r = ttm_bo_reserve(&bo->tbo, true, no_wait, NULL);
205 	if (unlikely(r != 0))
206 		return r;
207 	r = ttm_bo_wait(&bo->tbo, true, no_wait);
208 	ttm_bo_unreserve(&bo->tbo);
209 	return r;
210 }
211 
212