Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
28static 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
51static 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
58static 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
77static 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
94int 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
141void virtio_gpu_object_kunmap(struct virtio_gpu_object *bo)
142{
143 bo->vmap = NULL;
144 ttm_bo_kunmap(&bo->kmap);
145}
146
147int 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
161int 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;
187out:
188 kfree(bo->pages);
189 bo->pages = NULL;
190 return -ENOMEM;
191}
192
193void 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
200int 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