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 <drm/ttm/ttm_execbuf_util.h>
27
28 #include "virtgpu_drv.h"
29
virtio_gpu_resource_id_get(struct virtio_gpu_device * vgdev,uint32_t * resid)30 static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
31 uint32_t *resid)
32 {
33 #if 0
34 int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
35
36 if (handle < 0)
37 return handle;
38 #else
39 static int handle;
40
41 /*
42 * FIXME: dirty hack to avoid re-using IDs, virglrenderer
43 * can't deal with that. Needs fixing in virglrenderer, also
44 * should figure a better way to handle that in the guest.
45 */
46 handle++;
47 #endif
48
49 *resid = handle + 1;
50 return 0;
51 }
52
virtio_gpu_resource_id_put(struct virtio_gpu_device * vgdev,uint32_t id)53 static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
54 {
55 #if 0
56 ida_free(&vgdev->resource_ida, id - 1);
57 #endif
58 }
59
virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object * tbo)60 static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)
61 {
62 struct virtio_gpu_object *bo;
63 struct virtio_gpu_device *vgdev;
64
65 bo = container_of(tbo, struct virtio_gpu_object, tbo);
66 vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
67
68 if (bo->created)
69 virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);
70 if (bo->pages)
71 virtio_gpu_object_free_sg_table(bo);
72 if (bo->vmap)
73 virtio_gpu_object_kunmap(bo);
74 drm_gem_object_release(&bo->gem_base);
75 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
76 kfree(bo);
77 }
78
virtio_gpu_init_ttm_placement(struct virtio_gpu_object * vgbo)79 static void virtio_gpu_init_ttm_placement(struct virtio_gpu_object *vgbo)
80 {
81 u32 c = 1;
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 |
89 TTM_PL_FLAG_NO_EVICT;
90 vgbo->placement.num_placement = c;
91 vgbo->placement.num_busy_placement = c;
92
93 }
94
virtio_gpu_object_create(struct virtio_gpu_device * vgdev,struct virtio_gpu_object_params * params,struct virtio_gpu_object ** bo_ptr,struct virtio_gpu_fence * fence)95 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
96 struct virtio_gpu_object_params *params,
97 struct virtio_gpu_object **bo_ptr,
98 struct virtio_gpu_fence *fence)
99 {
100 struct virtio_gpu_object *bo;
101 size_t acc_size;
102 int ret;
103
104 *bo_ptr = NULL;
105
106 acc_size = ttm_bo_dma_acc_size(&vgdev->mman.bdev, params->size,
107 sizeof(struct virtio_gpu_object));
108
109 bo = kzalloc(sizeof(struct virtio_gpu_object), GFP_KERNEL);
110 if (bo == NULL)
111 return -ENOMEM;
112 ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
113 if (ret < 0) {
114 kfree(bo);
115 return ret;
116 }
117 params->size = roundup(params->size, PAGE_SIZE);
118 ret = drm_gem_object_init(vgdev->ddev, &bo->gem_base, params->size);
119 if (ret != 0) {
120 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
121 kfree(bo);
122 return ret;
123 }
124 bo->dumb = params->dumb;
125
126 if (params->virgl) {
127 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params, fence);
128 } else {
129 virtio_gpu_cmd_create_resource(vgdev, bo, params, fence);
130 }
131
132 virtio_gpu_init_ttm_placement(bo);
133 ret = ttm_bo_init(&vgdev->mman.bdev, &bo->tbo, params->size,
134 ttm_bo_type_device, &bo->placement, 0,
135 true, acc_size, NULL, NULL,
136 &virtio_gpu_ttm_bo_destroy);
137 /* ttm_bo_init failure will call the destroy */
138 if (ret != 0)
139 return ret;
140
141 if (fence) {
142 struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
143 struct list_head validate_list;
144 struct ttm_validate_buffer mainbuf;
145 struct ww_acquire_ctx ticket;
146 unsigned long irq_flags;
147 bool signaled;
148
149 INIT_LIST_HEAD(&validate_list);
150 memset(&mainbuf, 0, sizeof(struct ttm_validate_buffer));
151
152 /* use a gem reference since unref list undoes them */
153 drm_gem_object_get(&bo->gem_base);
154 mainbuf.bo = &bo->tbo;
155 list_add(&mainbuf.head, &validate_list);
156
157 ret = virtio_gpu_object_list_validate(&ticket, &validate_list);
158 if (ret == 0) {
159 spin_lock_irqsave(&drv->lock, irq_flags);
160 signaled = virtio_fence_signaled(&fence->f);
161 if (!signaled)
162 /* virtio create command still in flight */
163 ttm_eu_fence_buffer_objects(&ticket, &validate_list,
164 &fence->f);
165 spin_unlock_irqrestore(&drv->lock, irq_flags);
166 if (signaled)
167 /* virtio create command finished */
168 ttm_eu_backoff_reservation(&ticket, &validate_list);
169 }
170 virtio_gpu_unref_list(&validate_list);
171 }
172
173 *bo_ptr = bo;
174 return 0;
175 }
176
virtio_gpu_object_kunmap(struct virtio_gpu_object * bo)177 void virtio_gpu_object_kunmap(struct virtio_gpu_object *bo)
178 {
179 bo->vmap = NULL;
180 ttm_bo_kunmap(&bo->kmap);
181 }
182
virtio_gpu_object_kmap(struct virtio_gpu_object * bo)183 int virtio_gpu_object_kmap(struct virtio_gpu_object *bo)
184 {
185 bool is_iomem;
186 int r;
187
188 WARN_ON(bo->vmap);
189
190 r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
191 if (r)
192 return r;
193 bo->vmap = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
194 return 0;
195 }
196
virtio_gpu_object_get_sg_table(struct virtio_gpu_device * qdev,struct virtio_gpu_object * bo)197 int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
198 struct virtio_gpu_object *bo)
199 {
200 int ret;
201 struct page **pages = bo->tbo.ttm->pages;
202 int nr_pages = bo->tbo.num_pages;
203 struct ttm_operation_ctx ctx = {
204 .interruptible = false,
205 .no_wait_gpu = false
206 };
207 size_t max_segment;
208
209 /* wtf swapping */
210 if (bo->pages)
211 return 0;
212
213 if (bo->tbo.ttm->state == tt_unpopulated)
214 bo->tbo.ttm->bdev->driver->ttm_tt_populate(bo->tbo.ttm, &ctx);
215 bo->pages = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
216 if (!bo->pages)
217 goto out;
218
219 max_segment = virtio_max_dma_size(qdev->vdev);
220 max_segment &= PAGE_MASK;
221 if (max_segment > SCATTERLIST_MAX_SEGMENT)
222 max_segment = SCATTERLIST_MAX_SEGMENT;
223 ret = __sg_alloc_table_from_pages(bo->pages, pages, nr_pages, 0,
224 nr_pages << PAGE_SHIFT,
225 max_segment, GFP_KERNEL);
226 if (ret)
227 goto out;
228 return 0;
229 out:
230 kfree(bo->pages);
231 bo->pages = NULL;
232 return -ENOMEM;
233 }
234
virtio_gpu_object_free_sg_table(struct virtio_gpu_object * bo)235 void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo)
236 {
237 sg_free_table(bo->pages);
238 kfree(bo->pages);
239 bo->pages = NULL;
240 }
241
virtio_gpu_object_wait(struct virtio_gpu_object * bo,bool no_wait)242 int virtio_gpu_object_wait(struct virtio_gpu_object *bo, bool no_wait)
243 {
244 int r;
245
246 r = ttm_bo_reserve(&bo->tbo, true, no_wait, NULL);
247 if (unlikely(r != 0))
248 return r;
249 r = ttm_bo_wait(&bo->tbo, true, no_wait);
250 ttm_bo_unreserve(&bo->tbo);
251 return r;
252 }
253
254
