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
 34static 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
 56static 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
 64static 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			kfree(vgdev->capsets);
 84			vgdev->capsets = NULL;
 85			return;
 86		}
 87		DRM_INFO("cap set %d: id %d, max-version %d, max-size %d\n",
 88			 i, vgdev->capsets[i].id,
 89			 vgdev->capsets[i].max_version,
 90			 vgdev->capsets[i].max_size);
 91	}
 92	vgdev->num_capsets = num_capsets;
 93}
 94
 95int virtio_gpu_init(struct drm_device *dev)
 96{
 97	static vq_callback_t *callbacks[] = {
 98		virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack
 99	};
100	static const char * const names[] = { "control", "cursor" };
101
102	struct virtio_gpu_device *vgdev;
103	/* this will expand later */
104	struct virtqueue *vqs[2];
105	u32 num_scanouts, num_capsets;
106	int ret;
107
108	if (!virtio_has_feature(dev_to_virtio(dev->dev), VIRTIO_F_VERSION_1))
109		return -ENODEV;
110
111	vgdev = kzalloc(sizeof(struct virtio_gpu_device), GFP_KERNEL);
112	if (!vgdev)
113		return -ENOMEM;
114
115	vgdev->ddev = dev;
116	dev->dev_private = vgdev;
117	vgdev->vdev = dev_to_virtio(dev->dev);
118	vgdev->dev = dev->dev;
119
120	spin_lock_init(&vgdev->display_info_lock);
121	ida_init(&vgdev->ctx_id_ida);
122	ida_init(&vgdev->resource_ida);
123	init_waitqueue_head(&vgdev->resp_wq);
124	virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func);
125	virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func);
126
127	vgdev->fence_drv.context = dma_fence_context_alloc(1);
128	spin_lock_init(&vgdev->fence_drv.lock);
129	INIT_LIST_HEAD(&vgdev->fence_drv.fences);
130	INIT_LIST_HEAD(&vgdev->cap_cache);
131	INIT_WORK(&vgdev->config_changed_work,
132		  virtio_gpu_config_changed_work_func);
133
134	INIT_WORK(&vgdev->obj_free_work,
135		  virtio_gpu_array_put_free_work);
136	INIT_LIST_HEAD(&vgdev->obj_free_list);
137	spin_lock_init(&vgdev->obj_free_lock);
138
139#ifdef __LITTLE_ENDIAN
140	if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_VIRGL))
141		vgdev->has_virgl_3d = true;
142#endif
143	if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_EDID)) {
144		vgdev->has_edid = true;
145	}
146	if (virtio_has_feature(vgdev->vdev, VIRTIO_RING_F_INDIRECT_DESC)) {
147		vgdev->has_indirect = true;
148	}
149
150	DRM_INFO("features: %cvirgl %cedid\n",
151		 vgdev->has_virgl_3d ? '+' : '-',
152		 vgdev->has_edid     ? '+' : '-');
153
154	ret = virtio_find_vqs(vgdev->vdev, 2, vqs, callbacks, names, NULL);
155	if (ret) {
156		DRM_ERROR("failed to find virt queues\n");
157		goto err_vqs;
158	}
159	vgdev->ctrlq.vq = vqs[0];
160	vgdev->cursorq.vq = vqs[1];
161	ret = virtio_gpu_alloc_vbufs(vgdev);
162	if (ret) {
163		DRM_ERROR("failed to alloc vbufs\n");
164		goto err_vbufs;
165	}
166
167	/* get display info */
168	virtio_cread_le(vgdev->vdev, struct virtio_gpu_config,
169			num_scanouts, &num_scanouts);
170	vgdev->num_scanouts = min_t(uint32_t, num_scanouts,
171				    VIRTIO_GPU_MAX_SCANOUTS);
172	if (!vgdev->num_scanouts) {
173		DRM_ERROR("num_scanouts is zero\n");
174		ret = -EINVAL;
175		goto err_scanouts;
176	}
177	DRM_INFO("number of scanouts: %d\n", num_scanouts);
178
179	virtio_cread_le(vgdev->vdev, struct virtio_gpu_config,
180			num_capsets, &num_capsets);
181	DRM_INFO("number of cap sets: %d\n", num_capsets);
182
183	virtio_gpu_modeset_init(vgdev);
184
185	virtio_device_ready(vgdev->vdev);
186
187	if (num_capsets)
188		virtio_gpu_get_capsets(vgdev, num_capsets);
189	if (vgdev->has_edid)
190		virtio_gpu_cmd_get_edids(vgdev);
191	virtio_gpu_cmd_get_display_info(vgdev);
192	virtio_gpu_notify(vgdev);
193	wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending,
194			   5 * HZ);
195	return 0;
196
197err_scanouts:
198	virtio_gpu_free_vbufs(vgdev);
199err_vbufs:
200	vgdev->vdev->config->del_vqs(vgdev->vdev);
201err_vqs:
202	kfree(vgdev);
203	return ret;
204}
205
206static void virtio_gpu_cleanup_cap_cache(struct virtio_gpu_device *vgdev)
207{
208	struct virtio_gpu_drv_cap_cache *cache_ent, *tmp;
209
210	list_for_each_entry_safe(cache_ent, tmp, &vgdev->cap_cache, head) {
211		kfree(cache_ent->caps_cache);
212		kfree(cache_ent);
213	}
214}
215
216void virtio_gpu_deinit(struct drm_device *dev)
217{
218	struct virtio_gpu_device *vgdev = dev->dev_private;
219
220	flush_work(&vgdev->obj_free_work);
221	flush_work(&vgdev->ctrlq.dequeue_work);
222	flush_work(&vgdev->cursorq.dequeue_work);
223	flush_work(&vgdev->config_changed_work);
224	vgdev->vdev->config->reset(vgdev->vdev);
225	vgdev->vdev->config->del_vqs(vgdev->vdev);
226}
227
228void virtio_gpu_release(struct drm_device *dev)
229{
230	struct virtio_gpu_device *vgdev = dev->dev_private;
231
232	virtio_gpu_modeset_fini(vgdev);
233	virtio_gpu_free_vbufs(vgdev);
234	virtio_gpu_cleanup_cap_cache(vgdev);
235	kfree(vgdev->capsets);
236	kfree(vgdev);
237}
238
239int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
240{
241	struct virtio_gpu_device *vgdev = dev->dev_private;
242	struct virtio_gpu_fpriv *vfpriv;
243	int handle;
244
245	/* can't create contexts without 3d renderer */
246	if (!vgdev->has_virgl_3d)
247		return 0;
248
249	/* allocate a virt GPU context for this opener */
250	vfpriv = kzalloc(sizeof(*vfpriv), GFP_KERNEL);
251	if (!vfpriv)
252		return -ENOMEM;
253
254	mutex_init(&vfpriv->context_lock);
255
256	handle = ida_alloc(&vgdev->ctx_id_ida, GFP_KERNEL);
257	if (handle < 0) {
258		kfree(vfpriv);
259		return handle;
260	}
261
262	vfpriv->ctx_id = handle + 1;
263	file->driver_priv = vfpriv;
264	return 0;
265}
266
267void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file)
268{
269	struct virtio_gpu_device *vgdev = dev->dev_private;
270	struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
271
272	if (!vgdev->has_virgl_3d)
273		return;
274
275	if (vfpriv->context_created) {
276		virtio_gpu_cmd_context_destroy(vgdev, vfpriv->ctx_id);
277		virtio_gpu_notify(vgdev);
278	}
279
280	ida_free(&vgdev->ctx_id_ida, vfpriv->ctx_id - 1);
281	mutex_destroy(&vfpriv->context_lock);
282	kfree(vfpriv);
283	file->driver_priv = NULL;
284}