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 int virtio_gpu_fbdev = 1;
33 MODULE_PARM_DESC(fbdev, "Disable/Enable framebuffer device & console");
34 module_param_named(fbdev, virtio_gpu_fbdev, int, 0400);
36 static void virtio_gpu_config_changed_work_func(struct work_struct *work)
38 struct virtio_gpu_device *vgdev =
39 container_of(work, struct virtio_gpu_device,
41 u32 events_read, events_clear = 0;
43 /* read the config space */
44 virtio_cread(vgdev->vdev, struct virtio_gpu_config,
45 events_read, &events_read);
46 if (events_read & VIRTIO_GPU_EVENT_DISPLAY) {
48 virtio_gpu_cmd_get_edids(vgdev);
49 virtio_gpu_cmd_get_display_info(vgdev);
50 drm_helper_hpd_irq_event(vgdev->ddev);
51 events_clear |= VIRTIO_GPU_EVENT_DISPLAY;
53 virtio_cwrite(vgdev->vdev, struct virtio_gpu_config,
54 events_clear, &events_clear);
57 static int virtio_gpu_context_create(struct virtio_gpu_device *vgdev,
58 uint32_t nlen, const char *name)
60 int handle = ida_alloc(&vgdev->ctx_id_ida, GFP_KERNEL);
65 virtio_gpu_cmd_context_create(vgdev, handle, nlen, name);
69 static void virtio_gpu_context_destroy(struct virtio_gpu_device *vgdev,
72 virtio_gpu_cmd_context_destroy(vgdev, ctx_id);
73 ida_free(&vgdev->ctx_id_ida, ctx_id - 1);
76 static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq,
77 void (*work_func)(struct work_struct *work))
79 spin_lock_init(&vgvq->qlock);
80 init_waitqueue_head(&vgvq->ack_queue);
81 INIT_WORK(&vgvq->dequeue_work, work_func);
84 static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev,
89 vgdev->capsets = kcalloc(num_capsets,
90 sizeof(struct virtio_gpu_drv_capset),
92 if (!vgdev->capsets) {
93 DRM_ERROR("failed to allocate cap sets\n");
96 for (i = 0; i < num_capsets; i++) {
97 virtio_gpu_cmd_get_capset_info(vgdev, i);
98 ret = wait_event_timeout(vgdev->resp_wq,
99 vgdev->capsets[i].id > 0, 5 * HZ);
101 DRM_ERROR("timed out waiting for cap set %d\n", i);
102 kfree(vgdev->capsets);
103 vgdev->capsets = NULL;
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);
111 vgdev->num_capsets = num_capsets;
114 int virtio_gpu_driver_load(struct drm_device *dev, unsigned long flags)
116 static vq_callback_t *callbacks[] = {
117 virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack
119 static const char * const names[] = { "control", "cursor" };
121 struct virtio_gpu_device *vgdev;
122 /* this will expand later */
123 struct virtqueue *vqs[2];
124 u32 num_scanouts, num_capsets;
127 if (!virtio_has_feature(dev_to_virtio(dev->dev), VIRTIO_F_VERSION_1))
130 vgdev = kzalloc(sizeof(struct virtio_gpu_device), GFP_KERNEL);
135 dev->dev_private = vgdev;
136 vgdev->vdev = dev_to_virtio(dev->dev);
137 vgdev->dev = dev->dev;
139 spin_lock_init(&vgdev->display_info_lock);
140 ida_init(&vgdev->ctx_id_ida);
141 ida_init(&vgdev->resource_ida);
142 init_waitqueue_head(&vgdev->resp_wq);
143 virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func);
144 virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func);
146 vgdev->fence_drv.context = dma_fence_context_alloc(1);
147 spin_lock_init(&vgdev->fence_drv.lock);
148 INIT_LIST_HEAD(&vgdev->fence_drv.fences);
149 INIT_LIST_HEAD(&vgdev->cap_cache);
150 INIT_WORK(&vgdev->config_changed_work,
151 virtio_gpu_config_changed_work_func);
153 #ifdef __LITTLE_ENDIAN
154 if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_VIRGL))
155 vgdev->has_virgl_3d = true;
156 DRM_INFO("virgl 3d acceleration %s\n",
157 vgdev->has_virgl_3d ? "enabled" : "not supported by host");
159 DRM_INFO("virgl 3d acceleration not supported by guest\n");
161 if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_EDID)) {
162 vgdev->has_edid = true;
163 DRM_INFO("EDID support available.\n");
166 ret = virtio_find_vqs(vgdev->vdev, 2, vqs, callbacks, names, NULL);
168 DRM_ERROR("failed to find virt queues\n");
171 vgdev->ctrlq.vq = vqs[0];
172 vgdev->cursorq.vq = vqs[1];
173 ret = virtio_gpu_alloc_vbufs(vgdev);
175 DRM_ERROR("failed to alloc vbufs\n");
179 ret = virtio_gpu_ttm_init(vgdev);
181 DRM_ERROR("failed to init ttm %d\n", ret);
185 /* get display info */
186 virtio_cread(vgdev->vdev, struct virtio_gpu_config,
187 num_scanouts, &num_scanouts);
188 vgdev->num_scanouts = min_t(uint32_t, num_scanouts,
189 VIRTIO_GPU_MAX_SCANOUTS);
190 if (!vgdev->num_scanouts) {
191 DRM_ERROR("num_scanouts is zero\n");
195 DRM_INFO("number of scanouts: %d\n", num_scanouts);
197 virtio_cread(vgdev->vdev, struct virtio_gpu_config,
198 num_capsets, &num_capsets);
199 DRM_INFO("number of cap sets: %d\n", num_capsets);
201 ret = virtio_gpu_modeset_init(vgdev);
205 virtio_device_ready(vgdev->vdev);
206 vgdev->vqs_ready = true;
209 virtio_gpu_get_capsets(vgdev, num_capsets);
211 virtio_gpu_cmd_get_edids(vgdev);
212 virtio_gpu_cmd_get_display_info(vgdev);
213 wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending,
215 if (virtio_gpu_fbdev)
216 virtio_gpu_fbdev_init(vgdev);
222 virtio_gpu_ttm_fini(vgdev);
224 virtio_gpu_free_vbufs(vgdev);
226 vgdev->vdev->config->del_vqs(vgdev->vdev);
232 static void virtio_gpu_cleanup_cap_cache(struct virtio_gpu_device *vgdev)
234 struct virtio_gpu_drv_cap_cache *cache_ent, *tmp;
236 list_for_each_entry_safe(cache_ent, tmp, &vgdev->cap_cache, head) {
237 kfree(cache_ent->caps_cache);
242 void virtio_gpu_driver_unload(struct drm_device *dev)
244 struct virtio_gpu_device *vgdev = dev->dev_private;
246 vgdev->vqs_ready = false;
247 flush_work(&vgdev->ctrlq.dequeue_work);
248 flush_work(&vgdev->cursorq.dequeue_work);
249 flush_work(&vgdev->config_changed_work);
250 vgdev->vdev->config->del_vqs(vgdev->vdev);
252 virtio_gpu_modeset_fini(vgdev);
253 virtio_gpu_ttm_fini(vgdev);
254 virtio_gpu_free_vbufs(vgdev);
255 virtio_gpu_cleanup_cap_cache(vgdev);
256 kfree(vgdev->capsets);
260 int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
262 struct virtio_gpu_device *vgdev = dev->dev_private;
263 struct virtio_gpu_fpriv *vfpriv;
265 char dbgname[TASK_COMM_LEN];
267 /* can't create contexts without 3d renderer */
268 if (!vgdev->has_virgl_3d)
271 /* allocate a virt GPU context for this opener */
272 vfpriv = kzalloc(sizeof(*vfpriv), GFP_KERNEL);
276 get_task_comm(dbgname, current);
277 id = virtio_gpu_context_create(vgdev, strlen(dbgname), dbgname);
284 file->driver_priv = vfpriv;
288 void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file)
290 struct virtio_gpu_device *vgdev = dev->dev_private;
291 struct virtio_gpu_fpriv *vfpriv;
293 if (!vgdev->has_virgl_3d)
296 vfpriv = file->driver_priv;
298 virtio_gpu_context_destroy(vgdev, vfpriv->ctx_id);
300 file->driver_priv = NULL;