]> Git Repo - linux.git/blob - drivers/gpu/drm/virtio/virtgpu_kms.c
Merge tag 'powerpc-6.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
[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 #include <drm/drm_managed.h>
32
33 #include "virtgpu_drv.h"
34
35 static void virtio_gpu_config_changed_work_func(struct work_struct *work)
36 {
37         struct virtio_gpu_device *vgdev =
38                 container_of(work, struct virtio_gpu_device,
39                              config_changed_work);
40         u32 events_read, events_clear = 0;
41
42         /* read the config space */
43         virtio_cread_le(vgdev->vdev, struct virtio_gpu_config,
44                         events_read, &events_read);
45         if (events_read & VIRTIO_GPU_EVENT_DISPLAY) {
46                 if (vgdev->has_edid)
47                         virtio_gpu_cmd_get_edids(vgdev);
48                 virtio_gpu_cmd_get_display_info(vgdev);
49                 virtio_gpu_notify(vgdev);
50                 drm_helper_hpd_irq_event(vgdev->ddev);
51                 events_clear |= VIRTIO_GPU_EVENT_DISPLAY;
52         }
53         virtio_cwrite_le(vgdev->vdev, struct virtio_gpu_config,
54                          events_clear, &events_clear);
55 }
56
57 static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq,
58                                void (*work_func)(struct work_struct *work))
59 {
60         spin_lock_init(&vgvq->qlock);
61         init_waitqueue_head(&vgvq->ack_queue);
62         INIT_WORK(&vgvq->dequeue_work, work_func);
63 }
64
65 static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev,
66                                    int num_capsets)
67 {
68         int i, ret;
69         bool invalid_capset_id = false;
70         struct drm_device *drm = vgdev->ddev;
71
72         vgdev->capsets = drmm_kcalloc(drm, num_capsets,
73                                       sizeof(struct virtio_gpu_drv_capset),
74                                       GFP_KERNEL);
75         if (!vgdev->capsets) {
76                 DRM_ERROR("failed to allocate cap sets\n");
77                 return;
78         }
79         for (i = 0; i < num_capsets; i++) {
80                 virtio_gpu_cmd_get_capset_info(vgdev, i);
81                 virtio_gpu_notify(vgdev);
82                 ret = wait_event_timeout(vgdev->resp_wq,
83                                          vgdev->capsets[i].id > 0, 5 * HZ);
84                 /*
85                  * Capability ids are defined in the virtio-gpu spec and are
86                  * between 1 to 63, inclusive.
87                  */
88                 if (!vgdev->capsets[i].id ||
89                     vgdev->capsets[i].id > MAX_CAPSET_ID)
90                         invalid_capset_id = true;
91
92                 if (ret == 0)
93                         DRM_ERROR("timed out waiting for cap set %d\n", i);
94                 else if (invalid_capset_id)
95                         DRM_ERROR("invalid capset id %u", vgdev->capsets[i].id);
96
97                 if (ret == 0 || invalid_capset_id) {
98                         spin_lock(&vgdev->display_info_lock);
99                         drmm_kfree(drm, vgdev->capsets);
100                         vgdev->capsets = NULL;
101                         spin_unlock(&vgdev->display_info_lock);
102                         return;
103                 }
104
105                 vgdev->capset_id_mask |= 1 << vgdev->capsets[i].id;
106                 DRM_INFO("cap set %d: id %d, max-version %d, max-size %d\n",
107                          i, vgdev->capsets[i].id,
108                          vgdev->capsets[i].max_version,
109                          vgdev->capsets[i].max_size);
110         }
111
112         vgdev->num_capsets = num_capsets;
113 }
114
115 int virtio_gpu_init(struct virtio_device *vdev, struct drm_device *dev)
116 {
117         static vq_callback_t *callbacks[] = {
118                 virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack
119         };
120         static const char * const names[] = { "control", "cursor" };
121
122         struct virtio_gpu_device *vgdev;
123         /* this will expand later */
124         struct virtqueue *vqs[2];
125         u32 num_scanouts, num_capsets;
126         int ret = 0;
127
128         if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
129                 return -ENODEV;
130
131         vgdev = drmm_kzalloc(dev, sizeof(struct virtio_gpu_device), GFP_KERNEL);
132         if (!vgdev)
133                 return -ENOMEM;
134
135         vgdev->ddev = dev;
136         dev->dev_private = vgdev;
137         vgdev->vdev = vdev;
138
139         spin_lock_init(&vgdev->display_info_lock);
140         spin_lock_init(&vgdev->resource_export_lock);
141         spin_lock_init(&vgdev->host_visible_lock);
142         ida_init(&vgdev->ctx_id_ida);
143         ida_init(&vgdev->resource_ida);
144         init_waitqueue_head(&vgdev->resp_wq);
145         virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func);
146         virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func);
147
148         vgdev->fence_drv.context = dma_fence_context_alloc(1);
149         spin_lock_init(&vgdev->fence_drv.lock);
150         INIT_LIST_HEAD(&vgdev->fence_drv.fences);
151         INIT_LIST_HEAD(&vgdev->cap_cache);
152         INIT_WORK(&vgdev->config_changed_work,
153                   virtio_gpu_config_changed_work_func);
154
155         INIT_WORK(&vgdev->obj_free_work,
156                   virtio_gpu_array_put_free_work);
157         INIT_LIST_HEAD(&vgdev->obj_free_list);
158         spin_lock_init(&vgdev->obj_free_lock);
159
160 #ifdef __LITTLE_ENDIAN
161         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_VIRGL))
162                 vgdev->has_virgl_3d = true;
163 #endif
164         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_EDID)) {
165                 vgdev->has_edid = true;
166         }
167         if (virtio_has_feature(vgdev->vdev, VIRTIO_RING_F_INDIRECT_DESC)) {
168                 vgdev->has_indirect = true;
169         }
170         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_RESOURCE_UUID)) {
171                 vgdev->has_resource_assign_uuid = true;
172         }
173         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_RESOURCE_BLOB)) {
174                 vgdev->has_resource_blob = true;
175         }
176         if (virtio_get_shm_region(vgdev->vdev, &vgdev->host_visible_region,
177                                   VIRTIO_GPU_SHM_ID_HOST_VISIBLE)) {
178                 if (!devm_request_mem_region(&vgdev->vdev->dev,
179                                              vgdev->host_visible_region.addr,
180                                              vgdev->host_visible_region.len,
181                                              dev_name(&vgdev->vdev->dev))) {
182                         DRM_ERROR("Could not reserve host visible region\n");
183                         ret = -EBUSY;
184                         goto err_vqs;
185                 }
186
187                 DRM_INFO("Host memory window: 0x%lx +0x%lx\n",
188                          (unsigned long)vgdev->host_visible_region.addr,
189                          (unsigned long)vgdev->host_visible_region.len);
190                 vgdev->has_host_visible = true;
191                 drm_mm_init(&vgdev->host_visible_mm,
192                             (unsigned long)vgdev->host_visible_region.addr,
193                             (unsigned long)vgdev->host_visible_region.len);
194         }
195         if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_CONTEXT_INIT)) {
196                 vgdev->has_context_init = true;
197         }
198
199         DRM_INFO("features: %cvirgl %cedid %cresource_blob %chost_visible",
200                  vgdev->has_virgl_3d    ? '+' : '-',
201                  vgdev->has_edid        ? '+' : '-',
202                  vgdev->has_resource_blob ? '+' : '-',
203                  vgdev->has_host_visible ? '+' : '-');
204
205         DRM_INFO("features: %ccontext_init\n",
206                  vgdev->has_context_init ? '+' : '-');
207
208         ret = virtio_find_vqs(vgdev->vdev, 2, vqs, callbacks, names, NULL);
209         if (ret) {
210                 DRM_ERROR("failed to find virt queues\n");
211                 goto err_vqs;
212         }
213         vgdev->ctrlq.vq = vqs[0];
214         vgdev->cursorq.vq = vqs[1];
215         ret = virtio_gpu_alloc_vbufs(vgdev);
216         if (ret) {
217                 DRM_ERROR("failed to alloc vbufs\n");
218                 goto err_vbufs;
219         }
220
221         /* get display info */
222         virtio_cread_le(vgdev->vdev, struct virtio_gpu_config,
223                         num_scanouts, &num_scanouts);
224         vgdev->num_scanouts = min_t(uint32_t, num_scanouts,
225                                     VIRTIO_GPU_MAX_SCANOUTS);
226         if (!vgdev->num_scanouts) {
227                 DRM_ERROR("num_scanouts is zero\n");
228                 ret = -EINVAL;
229                 goto err_scanouts;
230         }
231         DRM_INFO("number of scanouts: %d\n", num_scanouts);
232
233         virtio_cread_le(vgdev->vdev, struct virtio_gpu_config,
234                         num_capsets, &num_capsets);
235         DRM_INFO("number of cap sets: %d\n", num_capsets);
236
237         ret = virtio_gpu_modeset_init(vgdev);
238         if (ret) {
239                 DRM_ERROR("modeset init failed\n");
240                 goto err_scanouts;
241         }
242
243         virtio_device_ready(vgdev->vdev);
244
245         if (num_capsets)
246                 virtio_gpu_get_capsets(vgdev, num_capsets);
247         if (vgdev->has_edid)
248                 virtio_gpu_cmd_get_edids(vgdev);
249         virtio_gpu_cmd_get_display_info(vgdev);
250         virtio_gpu_notify(vgdev);
251         wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending,
252                            5 * HZ);
253         return 0;
254
255 err_scanouts:
256         virtio_gpu_free_vbufs(vgdev);
257 err_vbufs:
258         vgdev->vdev->config->del_vqs(vgdev->vdev);
259 err_vqs:
260         dev->dev_private = NULL;
261         return ret;
262 }
263
264 static void virtio_gpu_cleanup_cap_cache(struct virtio_gpu_device *vgdev)
265 {
266         struct virtio_gpu_drv_cap_cache *cache_ent, *tmp;
267
268         list_for_each_entry_safe(cache_ent, tmp, &vgdev->cap_cache, head) {
269                 kfree(cache_ent->caps_cache);
270                 kfree(cache_ent);
271         }
272 }
273
274 void virtio_gpu_deinit(struct drm_device *dev)
275 {
276         struct virtio_gpu_device *vgdev = dev->dev_private;
277
278         flush_work(&vgdev->obj_free_work);
279         flush_work(&vgdev->ctrlq.dequeue_work);
280         flush_work(&vgdev->cursorq.dequeue_work);
281         flush_work(&vgdev->config_changed_work);
282         virtio_reset_device(vgdev->vdev);
283         vgdev->vdev->config->del_vqs(vgdev->vdev);
284 }
285
286 void virtio_gpu_release(struct drm_device *dev)
287 {
288         struct virtio_gpu_device *vgdev = dev->dev_private;
289
290         if (!vgdev)
291                 return;
292
293         virtio_gpu_modeset_fini(vgdev);
294         virtio_gpu_free_vbufs(vgdev);
295         virtio_gpu_cleanup_cap_cache(vgdev);
296
297         if (vgdev->has_host_visible)
298                 drm_mm_takedown(&vgdev->host_visible_mm);
299 }
300
301 int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
302 {
303         struct virtio_gpu_device *vgdev = dev->dev_private;
304         struct virtio_gpu_fpriv *vfpriv;
305         int handle;
306
307         /* can't create contexts without 3d renderer */
308         if (!vgdev->has_virgl_3d)
309                 return 0;
310
311         /* allocate a virt GPU context for this opener */
312         vfpriv = kzalloc(sizeof(*vfpriv), GFP_KERNEL);
313         if (!vfpriv)
314                 return -ENOMEM;
315
316         mutex_init(&vfpriv->context_lock);
317
318         handle = ida_alloc(&vgdev->ctx_id_ida, GFP_KERNEL);
319         if (handle < 0) {
320                 kfree(vfpriv);
321                 return handle;
322         }
323
324         vfpriv->ctx_id = handle + 1;
325         file->driver_priv = vfpriv;
326         return 0;
327 }
328
329 void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file)
330 {
331         struct virtio_gpu_device *vgdev = dev->dev_private;
332         struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
333
334         if (!vgdev->has_virgl_3d)
335                 return;
336
337         if (vfpriv->context_created) {
338                 virtio_gpu_cmd_context_destroy(vgdev, vfpriv->ctx_id);
339                 virtio_gpu_notify(vgdev);
340         }
341
342         ida_free(&vgdev->ctx_id_ida, vfpriv->ctx_id - 1);
343         mutex_destroy(&vfpriv->context_lock);
344         kfree(vfpriv);
345         file->driver_priv = NULL;
346 }
This page took 0.054066 seconds and 4 git commands to generate.