2 * Copyright (C) 2015 Red Hat, Inc.
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:
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.
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.
26 #include <linux/virtio.h>
27 #include <linux/virtio_config.h>
29 #include "virtgpu_drv.h"
31 static void virtio_gpu_config_changed_work_func(struct work_struct *work)
33 struct virtio_gpu_device *vgdev =
34 container_of(work, struct virtio_gpu_device,
36 u32 events_read, events_clear = 0;
38 /* read the config space */
39 virtio_cread(vgdev->vdev, struct virtio_gpu_config,
40 events_read, &events_read);
41 if (events_read & VIRTIO_GPU_EVENT_DISPLAY) {
43 virtio_gpu_cmd_get_edids(vgdev);
44 virtio_gpu_cmd_get_display_info(vgdev);
45 drm_helper_hpd_irq_event(vgdev->ddev);
46 events_clear |= VIRTIO_GPU_EVENT_DISPLAY;
48 virtio_cwrite(vgdev->vdev, struct virtio_gpu_config,
49 events_clear, &events_clear);
52 static int virtio_gpu_context_create(struct virtio_gpu_device *vgdev,
53 uint32_t nlen, const char *name)
55 int handle = ida_alloc(&vgdev->ctx_id_ida, GFP_KERNEL);
60 virtio_gpu_cmd_context_create(vgdev, handle, nlen, name);
64 static void virtio_gpu_context_destroy(struct virtio_gpu_device *vgdev,
67 virtio_gpu_cmd_context_destroy(vgdev, ctx_id);
68 ida_free(&vgdev->ctx_id_ida, ctx_id - 1);
71 static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq,
72 void (*work_func)(struct work_struct *work))
74 spin_lock_init(&vgvq->qlock);
75 init_waitqueue_head(&vgvq->ack_queue);
76 INIT_WORK(&vgvq->dequeue_work, work_func);
79 static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev,
84 vgdev->capsets = kcalloc(num_capsets,
85 sizeof(struct virtio_gpu_drv_capset),
87 if (!vgdev->capsets) {
88 DRM_ERROR("failed to allocate cap sets\n");
91 for (i = 0; i < num_capsets; i++) {
92 virtio_gpu_cmd_get_capset_info(vgdev, i);
93 ret = wait_event_timeout(vgdev->resp_wq,
94 vgdev->capsets[i].id > 0, 5 * HZ);
96 DRM_ERROR("timed out waiting for cap set %d\n", i);
97 kfree(vgdev->capsets);
98 vgdev->capsets = NULL;
101 DRM_INFO("cap set %d: id %d, max-version %d, max-size %d\n",
102 i, vgdev->capsets[i].id,
103 vgdev->capsets[i].max_version,
104 vgdev->capsets[i].max_size);
106 vgdev->num_capsets = num_capsets;
109 int virtio_gpu_driver_load(struct drm_device *dev, unsigned long flags)
111 static vq_callback_t *callbacks[] = {
112 virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack
114 static const char * const names[] = { "control", "cursor" };
116 struct virtio_gpu_device *vgdev;
117 /* this will expand later */
118 struct virtqueue *vqs[2];
119 u32 num_scanouts, num_capsets;
122 if (!virtio_has_feature(dev_to_virtio(dev->dev), VIRTIO_F_VERSION_1))
125 vgdev = kzalloc(sizeof(struct virtio_gpu_device), GFP_KERNEL);
130 dev->dev_private = vgdev;
131 vgdev->vdev = dev_to_virtio(dev->dev);
132 vgdev->dev = dev->dev;
134 spin_lock_init(&vgdev->display_info_lock);
135 ida_init(&vgdev->ctx_id_ida);
136 ida_init(&vgdev->resource_ida);
137 init_waitqueue_head(&vgdev->resp_wq);
138 virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func);
139 virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func);
141 vgdev->fence_drv.context = dma_fence_context_alloc(1);
142 spin_lock_init(&vgdev->fence_drv.lock);
143 INIT_LIST_HEAD(&vgdev->fence_drv.fences);
144 INIT_LIST_HEAD(&vgdev->cap_cache);
145 INIT_WORK(&vgdev->config_changed_work,
146 virtio_gpu_config_changed_work_func);
148 #ifdef __LITTLE_ENDIAN
149 if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_VIRGL))
150 vgdev->has_virgl_3d = true;
151 DRM_INFO("virgl 3d acceleration %s\n",
152 vgdev->has_virgl_3d ? "enabled" : "not supported by host");
154 DRM_INFO("virgl 3d acceleration not supported by guest\n");
156 if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_EDID)) {
157 vgdev->has_edid = true;
158 DRM_INFO("EDID support available.\n");
161 ret = virtio_find_vqs(vgdev->vdev, 2, vqs, callbacks, names, NULL);
163 DRM_ERROR("failed to find virt queues\n");
166 vgdev->ctrlq.vq = vqs[0];
167 vgdev->cursorq.vq = vqs[1];
168 ret = virtio_gpu_alloc_vbufs(vgdev);
170 DRM_ERROR("failed to alloc vbufs\n");
174 ret = virtio_gpu_ttm_init(vgdev);
176 DRM_ERROR("failed to init ttm %d\n", ret);
180 /* get display info */
181 virtio_cread(vgdev->vdev, struct virtio_gpu_config,
182 num_scanouts, &num_scanouts);
183 vgdev->num_scanouts = min_t(uint32_t, num_scanouts,
184 VIRTIO_GPU_MAX_SCANOUTS);
185 if (!vgdev->num_scanouts) {
186 DRM_ERROR("num_scanouts is zero\n");
190 DRM_INFO("number of scanouts: %d\n", num_scanouts);
192 virtio_cread(vgdev->vdev, struct virtio_gpu_config,
193 num_capsets, &num_capsets);
194 DRM_INFO("number of cap sets: %d\n", num_capsets);
196 ret = virtio_gpu_modeset_init(vgdev);
200 virtio_device_ready(vgdev->vdev);
201 vgdev->vqs_ready = true;
204 virtio_gpu_get_capsets(vgdev, num_capsets);
206 virtio_gpu_cmd_get_edids(vgdev);
207 virtio_gpu_cmd_get_display_info(vgdev);
208 wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending,
214 virtio_gpu_ttm_fini(vgdev);
216 virtio_gpu_free_vbufs(vgdev);
218 vgdev->vdev->config->del_vqs(vgdev->vdev);
224 static void virtio_gpu_cleanup_cap_cache(struct virtio_gpu_device *vgdev)
226 struct virtio_gpu_drv_cap_cache *cache_ent, *tmp;
228 list_for_each_entry_safe(cache_ent, tmp, &vgdev->cap_cache, head) {
229 kfree(cache_ent->caps_cache);
234 void virtio_gpu_driver_unload(struct drm_device *dev)
236 struct virtio_gpu_device *vgdev = dev->dev_private;
238 vgdev->vqs_ready = false;
239 flush_work(&vgdev->ctrlq.dequeue_work);
240 flush_work(&vgdev->cursorq.dequeue_work);
241 flush_work(&vgdev->config_changed_work);
242 vgdev->vdev->config->del_vqs(vgdev->vdev);
244 virtio_gpu_modeset_fini(vgdev);
245 virtio_gpu_ttm_fini(vgdev);
246 virtio_gpu_free_vbufs(vgdev);
247 virtio_gpu_cleanup_cap_cache(vgdev);
248 kfree(vgdev->capsets);
252 int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
254 struct virtio_gpu_device *vgdev = dev->dev_private;
255 struct virtio_gpu_fpriv *vfpriv;
257 char dbgname[TASK_COMM_LEN];
259 /* can't create contexts without 3d renderer */
260 if (!vgdev->has_virgl_3d)
263 /* allocate a virt GPU context for this opener */
264 vfpriv = kzalloc(sizeof(*vfpriv), GFP_KERNEL);
268 get_task_comm(dbgname, current);
269 id = virtio_gpu_context_create(vgdev, strlen(dbgname), dbgname);
276 file->driver_priv = vfpriv;
280 void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file)
282 struct virtio_gpu_device *vgdev = dev->dev_private;
283 struct virtio_gpu_fpriv *vfpriv;
285 if (!vgdev->has_virgl_3d)
288 vfpriv = file->driver_priv;
290 virtio_gpu_context_destroy(vgdev, vfpriv->ctx_id);
292 file->driver_priv = NULL;