summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/virtio/virtgpu_kms.c
blob: 491866865c3397b4c2e73fdfc3444aac301f9ee4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
/*
 * Copyright (C) 2015 Red Hat, Inc.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include <linux/virtio.h>
#include <linux/virtio_config.h>
#include <drm/drmP.h>
#include "virtgpu_drv.h"

static int virtio_gpu_fbdev = 1;

MODULE_PARM_DESC(fbdev, "Disable/Enable framebuffer device & console");
module_param_named(fbdev, virtio_gpu_fbdev, int, 0400);

static void virtio_gpu_config_changed_work_func(struct work_struct *work)
{
	struct virtio_gpu_device *vgdev =
		container_of(work, struct virtio_gpu_device,
			     config_changed_work);
	u32 events_read, events_clear = 0;

	/* read the config space */
	virtio_cread(vgdev->vdev, struct virtio_gpu_config,
		     events_read, &events_read);
	if (events_read & VIRTIO_GPU_EVENT_DISPLAY) {
		virtio_gpu_cmd_get_display_info(vgdev);
		drm_helper_hpd_irq_event(vgdev->ddev);
		events_clear |= VIRTIO_GPU_EVENT_DISPLAY;
	}
	virtio_cwrite(vgdev->vdev, struct virtio_gpu_config,
		      events_clear, &events_clear);
}

static void virtio_gpu_ctx_id_get(struct virtio_gpu_device *vgdev,
				  uint32_t *resid)
{
	int handle;

	idr_preload(GFP_KERNEL);
	spin_lock(&vgdev->ctx_id_idr_lock);
	handle = idr_alloc(&vgdev->ctx_id_idr, NULL, 1, 0, 0);
	spin_unlock(&vgdev->ctx_id_idr_lock);
	idr_preload_end();
	*resid = handle;
}

static void virtio_gpu_ctx_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
{
	spin_lock(&vgdev->ctx_id_idr_lock);
	idr_remove(&vgdev->ctx_id_idr, id);
	spin_unlock(&vgdev->ctx_id_idr_lock);
}

static void virtio_gpu_context_create(struct virtio_gpu_device *vgdev,
				      uint32_t nlen, const char *name,
				      uint32_t *ctx_id)
{
	virtio_gpu_ctx_id_get(vgdev, ctx_id);
	virtio_gpu_cmd_context_create(vgdev, *ctx_id, nlen, name);
}

static void virtio_gpu_context_destroy(struct virtio_gpu_device *vgdev,
				      uint32_t ctx_id)
{
	virtio_gpu_cmd_context_destroy(vgdev, ctx_id);
	virtio_gpu_ctx_id_put(vgdev, ctx_id);
}

static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq,
			       void (*work_func)(struct work_struct *work))
{
	spin_lock_init(&vgvq->qlock);
	init_waitqueue_head(&vgvq->ack_queue);
	INIT_WORK(&vgvq->dequeue_work, work_func);
}

static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev,
				   int num_capsets)
{
	int i, ret;

	vgdev->capsets = kcalloc(num_capsets,
				 sizeof(struct virtio_gpu_drv_capset),
				 GFP_KERNEL);
	if (!vgdev->capsets) {
		DRM_ERROR("failed to allocate cap sets\n");
		return;
	}
	for (i = 0; i < num_capsets; i++) {
		virtio_gpu_cmd_get_capset_info(vgdev, i);
		ret = wait_event_timeout(vgdev->resp_wq,
					 vgdev->capsets[i].id > 0, 5 * HZ);
		if (ret == 0) {
			DRM_ERROR("timed out waiting for cap set %d\n", i);
			kfree(vgdev->capsets);
			vgdev->capsets = NULL;
			return;
		}
		DRM_INFO("cap set %d: id %d, max-version %d, max-size %d\n",
			 i, vgdev->capsets[i].id,
			 vgdev->capsets[i].max_version,
			 vgdev->capsets[i].max_size);
	}
	vgdev->num_capsets = num_capsets;
}

int virtio_gpu_driver_load(struct drm_device *dev, unsigned long flags)
{
	static vq_callback_t *callbacks[] = {
		virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack
	};
	static const char * const names[] = { "control", "cursor" };

	struct virtio_gpu_device *vgdev;
	/* this will expand later */
	struct virtqueue *vqs[2];
	u32 num_scanouts, num_capsets;
	int ret;

	if (!virtio_has_feature(dev->virtdev, VIRTIO_F_VERSION_1))
		return -ENODEV;

	vgdev = kzalloc(sizeof(struct virtio_gpu_device), GFP_KERNEL);
	if (!vgdev)
		return -ENOMEM;

	vgdev->ddev = dev;
	dev->dev_private = vgdev;
	vgdev->vdev = dev->virtdev;
	vgdev->dev = dev->dev;

	spin_lock_init(&vgdev->display_info_lock);
	spin_lock_init(&vgdev->ctx_id_idr_lock);
	idr_init(&vgdev->ctx_id_idr);
	spin_lock_init(&vgdev->resource_idr_lock);
	idr_init(&vgdev->resource_idr);
	init_waitqueue_head(&vgdev->resp_wq);
	virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func);
	virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func);

	vgdev->fence_drv.context = dma_fence_context_alloc(1);
	spin_lock_init(&vgdev->fence_drv.lock);
	INIT_LIST_HEAD(&vgdev->fence_drv.fences);
	INIT_LIST_HEAD(&vgdev->cap_cache);
	INIT_WORK(&vgdev->config_changed_work,
		  virtio_gpu_config_changed_work_func);

#ifdef __LITTLE_ENDIAN
	if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_VIRGL))
		vgdev->has_virgl_3d = true;
	DRM_INFO("virgl 3d acceleration %s\n",
		 vgdev->has_virgl_3d ? "enabled" : "not supported by host");
#else
	DRM_INFO("virgl 3d acceleration not supported by guest\n");
#endif

	ret = vgdev->vdev->config->find_vqs(vgdev->vdev, 2, vqs,
					    callbacks, names, NULL);
	if (ret) {
		DRM_ERROR("failed to find virt queues\n");
		goto err_vqs;
	}
	vgdev->ctrlq.vq = vqs[0];
	vgdev->cursorq.vq = vqs[1];
	ret = virtio_gpu_alloc_vbufs(vgdev);
	if (ret) {
		DRM_ERROR("failed to alloc vbufs\n");
		goto err_vbufs;
	}

	ret = virtio_gpu_ttm_init(vgdev);
	if (ret) {
		DRM_ERROR("failed to init ttm %d\n", ret);
		goto err_ttm;
	}

	/* get display info */
	virtio_cread(vgdev->vdev, struct virtio_gpu_config,
		     num_scanouts, &num_scanouts);
	vgdev->num_scanouts = min_t(uint32_t, num_scanouts,
				    VIRTIO_GPU_MAX_SCANOUTS);
	if (!vgdev->num_scanouts) {
		DRM_ERROR("num_scanouts is zero\n");
		ret = -EINVAL;
		goto err_scanouts;
	}
	DRM_INFO("number of scanouts: %d\n", num_scanouts);

	virtio_cread(vgdev->vdev, struct virtio_gpu_config,
		     num_capsets, &num_capsets);
	DRM_INFO("number of cap sets: %d\n", num_capsets);

	ret = virtio_gpu_modeset_init(vgdev);
	if (ret)
		goto err_modeset;

	virtio_device_ready(vgdev->vdev);
	vgdev->vqs_ready = true;

	if (num_capsets)
		virtio_gpu_get_capsets(vgdev, num_capsets);
	virtio_gpu_cmd_get_display_info(vgdev);
	wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending,
			   5 * HZ);
	if (virtio_gpu_fbdev)
		virtio_gpu_fbdev_init(vgdev);

	return 0;

err_modeset:
err_scanouts:
	virtio_gpu_ttm_fini(vgdev);
err_ttm:
	virtio_gpu_free_vbufs(vgdev);
err_vbufs:
	vgdev->vdev->config->del_vqs(vgdev->vdev);
err_vqs:
	kfree(vgdev);
	return ret;
}

static void virtio_gpu_cleanup_cap_cache(struct virtio_gpu_device *vgdev)
{
	struct virtio_gpu_drv_cap_cache *cache_ent, *tmp;

	list_for_each_entry_safe(cache_ent, tmp, &vgdev->cap_cache, head) {
		kfree(cache_ent->caps_cache);
		kfree(cache_ent);
	}
}

void virtio_gpu_driver_unload(struct drm_device *dev)
{
	struct virtio_gpu_device *vgdev = dev->dev_private;

	vgdev->vqs_ready = false;
	flush_work(&vgdev->ctrlq.dequeue_work);
	flush_work(&vgdev->cursorq.dequeue_work);
	flush_work(&vgdev->config_changed_work);
	vgdev->vdev->config->del_vqs(vgdev->vdev);

	virtio_gpu_modeset_fini(vgdev);
	virtio_gpu_ttm_fini(vgdev);
	virtio_gpu_free_vbufs(vgdev);
	virtio_gpu_cleanup_cap_cache(vgdev);
	kfree(vgdev->capsets);
	kfree(vgdev);
}

int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
{
	struct virtio_gpu_device *vgdev = dev->dev_private;
	struct virtio_gpu_fpriv *vfpriv;
	uint32_t id;
	char dbgname[64], tmpname[TASK_COMM_LEN];

	/* can't create contexts without 3d renderer */
	if (!vgdev->has_virgl_3d)
		return 0;

	get_task_comm(tmpname, current);
	snprintf(dbgname, sizeof(dbgname), "%s", tmpname);
	dbgname[63] = 0;
	/* allocate a virt GPU context for this opener */
	vfpriv = kzalloc(sizeof(*vfpriv), GFP_KERNEL);
	if (!vfpriv)
		return -ENOMEM;

	virtio_gpu_context_create(vgdev, strlen(dbgname), dbgname, &id);

	vfpriv->ctx_id = id;
	file->driver_priv = vfpriv;
	return 0;
}

void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file)
{
	struct virtio_gpu_device *vgdev = dev->dev_private;
	struct virtio_gpu_fpriv *vfpriv;

	if (!vgdev->has_virgl_3d)
		return;

	vfpriv = file->driver_priv;

	virtio_gpu_context_destroy(vgdev, vfpriv->ctx_id);
	kfree(vfpriv);
	file->driver_priv = NULL;
}