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[linux.git] / drivers / gpu / drm / virtio / virtgpu_kms.c
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 <linux/virtio.h>
27 #include <linux/virtio_config.h>
28 #include <linux/virtio_ring.h>
29
30 #include <drm/drm_file.h>
31
32 #include "virtgpu_drv.h"
33
34 static void virtio_gpu_config_changed_work_func(struct work_struct *work)
35 {
36         struct virtio_gpu_device *vgdev =
37                 container_of(work, struct virtio_gpu_device,
38                              config_changed_work);
39         u32 events_read, events_clear = 0;
40
41         /* read the config space */
42         virtio_cread_le(vgdev->vdev, struct virtio_gpu_config,
43                         events_read, &events_read);
44         if (events_read & VIRTIO_GPU_EVENT_DISPLAY) {
45                 if (vgdev->has_edid)
46                         virtio_gpu_cmd_get_edids(vgdev);
47                 virtio_gpu_cmd_get_display_info(vgdev);
48                 virtio_gpu_notify(vgdev);
49                 drm_helper_hpd_irq_event(vgdev->ddev);
50                 events_clear |= VIRTIO_GPU_EVENT_DISPLAY;
51         }
52         virtio_cwrite_le(vgdev->vdev, struct virtio_gpu_config,
53                          events_clear, &events_clear);
54 }
55
56 static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq,
57                                void (*work_func)(struct work_struct *work))
58 {
59         spin_lock_init(&vgvq->qlock);
60         init_waitqueue_head(&vgvq->ack_queue);
61         INIT_WORK(&vgvq->dequeue_work, work_func);
62 }
63
64 static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev,
65                                    int num_capsets)
66 {
67         int i, ret;
68
69         vgdev->capsets = kcalloc(num_capsets,
70                                  sizeof(struct virtio_gpu_drv_capset),
71                                  GFP_KERNEL);
72         if (!vgdev->capsets) {
73                 DRM_ERROR("failed to allocate cap sets\n");
74                 return;
75         }
76         for (i = 0; i < num_capsets; i++) {
77                 virtio_gpu_cmd_get_capset_info(vgdev, i);
78                 virtio_gpu_notify(vgdev);
79                 ret = wait_event_timeout(vgdev->resp_wq,
80                                          vgdev->capsets[i].id > 0, 5 * HZ);
81                 if (ret == 0) {
82                         DRM_ERROR("timed out waiting for cap set %d\n", i);
83                         spin_lock(&vgdev->display_info_lock);
84                         kfree(vgdev->capsets);
85                         vgdev->capsets = NULL;
86                         spin_unlock(&vgdev->display_info_lock);
87                         return;
88                 }
89                 DRM_INFO("cap set %d: id %d, max-version %d, max-size %d\n",
90                          i, vgdev->capsets[i].id,
91                          vgdev->capsets[i].max_version,
92                          vgdev->capsets[i].max_size);
93         }
94         vgdev->num_capsets = num_capsets;
95 }
96
97 int virtio_gpu_init(struct drm_device *dev)
98 {
99         static vq_callback_t *callbacks[] = {
100                 virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack
101         };
102         static const char * const names[] = { "control", "cursor" };
103
104         struct virtio_gpu_device *vgdev;
105         /* this will expand later */
106         struct virtqueue *vqs[2];
107         u32 num_scanouts, num_capsets;
108         int ret = 0;
109
110         if (!virtio_has_feature(dev_to_virtio(dev->dev), VIRTIO_F_VERSION_1))
111                 return -ENODEV;
112
113         vgdev = kzalloc(sizeof(struct virtio_gpu_device), GFP_KERNEL);
114         if (!vgdev)
115                 return -ENOMEM;
116
117         vgdev->ddev = dev;
118         dev->dev_private = vgdev;
119         vgdev->vdev = dev_to_virtio(dev->dev);
120         vgdev->dev = dev->dev;
121
122         spin_lock_init(&vgdev->display_info_lock);
123         spin_lock_init(&vgdev->resource_export_lock);
124         spin_lock_init(&vgdev->host_visible_lock);
125         ida_init(&vgdev->ctx_id_ida);
126         ida_init(&vgdev->resource_ida);
127         init_waitqueue_head(&vgdev->resp_wq);
128         virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func);
129         virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func);
130
131         vgdev->fence_drv.context = dma_fence_context_alloc(1);
132         spin_lock_init(&vgdev->fence_drv.lock);
133         INIT_LIST_HEAD(&vgdev->fence_drv.fences);
134         INIT_LIST_HEAD(&vgdev->cap_cache);
135         INIT_WORK(&vgdev->config_changed_work,
136                   virtio_gpu_config_changed_work_func);
137
138         INIT_WORK(&vgdev->obj_free_work,
139                   virtio_gpu_array_put_free_work);
140         INIT_LIST_HEAD(&vgdev->obj_free_list);
141         spin_lock_init(&vgdev->obj_free_lock);
142
143 #ifdef __LITTLE_ENDIAN
144         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_VIRGL))
145                 vgdev->has_virgl_3d = true;
146 #endif
147         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_EDID)) {
148                 vgdev->has_edid = true;
149         }
150         if (virtio_has_feature(vgdev->vdev, VIRTIO_RING_F_INDIRECT_DESC)) {
151                 vgdev->has_indirect = true;
152         }
153         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_RESOURCE_UUID)) {
154                 vgdev->has_resource_assign_uuid = true;
155         }
156         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_RESOURCE_BLOB)) {
157                 vgdev->has_resource_blob = true;
158         }
159         if (virtio_get_shm_region(vgdev->vdev, &vgdev->host_visible_region,
160                                   VIRTIO_GPU_SHM_ID_HOST_VISIBLE)) {
161                 if (!devm_request_mem_region(&vgdev->vdev->dev,
162                                              vgdev->host_visible_region.addr,
163                                              vgdev->host_visible_region.len,
164                                              dev_name(&vgdev->vdev->dev))) {
165                         DRM_ERROR("Could not reserve host visible region\n");
166                         goto err_vqs;
167                 }
168
169                 DRM_INFO("Host memory window: 0x%lx +0x%lx\n",
170                          (unsigned long)vgdev->host_visible_region.addr,
171                          (unsigned long)vgdev->host_visible_region.len);
172                 vgdev->has_host_visible = true;
173                 drm_mm_init(&vgdev->host_visible_mm,
174                             (unsigned long)vgdev->host_visible_region.addr,
175                             (unsigned long)vgdev->host_visible_region.len);
176         }
177
178         DRM_INFO("features: %cvirgl %cedid %cresource_blob %chost_visible\n",
179                  vgdev->has_virgl_3d    ? '+' : '-',
180                  vgdev->has_edid        ? '+' : '-',
181                  vgdev->has_resource_blob ? '+' : '-',
182                  vgdev->has_host_visible ? '+' : '-');
183
184         ret = virtio_find_vqs(vgdev->vdev, 2, vqs, callbacks, names, NULL);
185         if (ret) {
186                 DRM_ERROR("failed to find virt queues\n");
187                 goto err_vqs;
188         }
189         vgdev->ctrlq.vq = vqs[0];
190         vgdev->cursorq.vq = vqs[1];
191         ret = virtio_gpu_alloc_vbufs(vgdev);
192         if (ret) {
193                 DRM_ERROR("failed to alloc vbufs\n");
194                 goto err_vbufs;
195         }
196
197         /* get display info */
198         virtio_cread_le(vgdev->vdev, struct virtio_gpu_config,
199                         num_scanouts, &num_scanouts);
200         vgdev->num_scanouts = min_t(uint32_t, num_scanouts,
201                                     VIRTIO_GPU_MAX_SCANOUTS);
202         if (!vgdev->num_scanouts) {
203                 DRM_ERROR("num_scanouts is zero\n");
204                 ret = -EINVAL;
205                 goto err_scanouts;
206         }
207         DRM_INFO("number of scanouts: %d\n", num_scanouts);
208
209         virtio_cread_le(vgdev->vdev, struct virtio_gpu_config,
210                         num_capsets, &num_capsets);
211         DRM_INFO("number of cap sets: %d\n", num_capsets);
212
213         ret = virtio_gpu_modeset_init(vgdev);
214         if (ret) {
215                 DRM_ERROR("modeset init failed\n");
216                 goto err_scanouts;
217         }
218
219         virtio_device_ready(vgdev->vdev);
220
221         if (num_capsets)
222                 virtio_gpu_get_capsets(vgdev, num_capsets);
223         if (vgdev->has_edid)
224                 virtio_gpu_cmd_get_edids(vgdev);
225         virtio_gpu_cmd_get_display_info(vgdev);
226         virtio_gpu_notify(vgdev);
227         wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending,
228                            5 * HZ);
229         return 0;
230
231 err_scanouts:
232         virtio_gpu_free_vbufs(vgdev);
233 err_vbufs:
234         vgdev->vdev->config->del_vqs(vgdev->vdev);
235 err_vqs:
236         kfree(vgdev);
237         return ret;
238 }
239
240 static void virtio_gpu_cleanup_cap_cache(struct virtio_gpu_device *vgdev)
241 {
242         struct virtio_gpu_drv_cap_cache *cache_ent, *tmp;
243
244         list_for_each_entry_safe(cache_ent, tmp, &vgdev->cap_cache, head) {
245                 kfree(cache_ent->caps_cache);
246                 kfree(cache_ent);
247         }
248 }
249
250 void virtio_gpu_deinit(struct drm_device *dev)
251 {
252         struct virtio_gpu_device *vgdev = dev->dev_private;
253
254         flush_work(&vgdev->obj_free_work);
255         flush_work(&vgdev->ctrlq.dequeue_work);
256         flush_work(&vgdev->cursorq.dequeue_work);
257         flush_work(&vgdev->config_changed_work);
258         vgdev->vdev->config->reset(vgdev->vdev);
259         vgdev->vdev->config->del_vqs(vgdev->vdev);
260 }
261
262 void virtio_gpu_release(struct drm_device *dev)
263 {
264         struct virtio_gpu_device *vgdev = dev->dev_private;
265
266         virtio_gpu_modeset_fini(vgdev);
267         virtio_gpu_free_vbufs(vgdev);
268         virtio_gpu_cleanup_cap_cache(vgdev);
269
270         if (vgdev->has_host_visible)
271                 drm_mm_takedown(&vgdev->host_visible_mm);
272
273         kfree(vgdev->capsets);
274         kfree(vgdev);
275 }
276
277 int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
278 {
279         struct virtio_gpu_device *vgdev = dev->dev_private;
280         struct virtio_gpu_fpriv *vfpriv;
281         int handle;
282
283         /* can't create contexts without 3d renderer */
284         if (!vgdev->has_virgl_3d)
285                 return 0;
286
287         /* allocate a virt GPU context for this opener */
288         vfpriv = kzalloc(sizeof(*vfpriv), GFP_KERNEL);
289         if (!vfpriv)
290                 return -ENOMEM;
291
292         mutex_init(&vfpriv->context_lock);
293
294         handle = ida_alloc(&vgdev->ctx_id_ida, GFP_KERNEL);
295         if (handle < 0) {
296                 kfree(vfpriv);
297                 return handle;
298         }
299
300         vfpriv->ctx_id = handle + 1;
301         file->driver_priv = vfpriv;
302         return 0;
303 }
304
305 void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file)
306 {
307         struct virtio_gpu_device *vgdev = dev->dev_private;
308         struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
309
310         if (!vgdev->has_virgl_3d)
311                 return;
312
313         if (vfpriv->context_created) {
314                 virtio_gpu_cmd_context_destroy(vgdev, vfpriv->ctx_id);
315                 virtio_gpu_notify(vgdev);
316         }
317
318         ida_free(&vgdev->ctx_id_ida, vfpriv->ctx_id - 1);
319         mutex_destroy(&vfpriv->context_lock);
320         kfree(vfpriv);
321         file->driver_priv = NULL;
322 }
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