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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 <drm/drmP.h>
29#include "virtgpu_drv.h"
30
31static int virtio_gpu_fbdev = 1;
32
33MODULE_PARM_DESC(fbdev, "Disable/Enable framebuffer device & console");
34module_param_named(fbdev, virtio_gpu_fbdev, int, 0400);
35
36static void virtio_gpu_config_changed_work_func(struct work_struct *work)
37{
38 struct virtio_gpu_device *vgdev =
39 container_of(work, struct virtio_gpu_device,
40 config_changed_work);
41 u32 events_read, events_clear = 0;
42
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) {
47 virtio_gpu_cmd_get_display_info(vgdev);
48 drm_helper_hpd_irq_event(vgdev->ddev);
49 events_clear |= VIRTIO_GPU_EVENT_DISPLAY;
50 }
51 virtio_cwrite(vgdev->vdev, struct virtio_gpu_config,
52 events_clear, &events_clear);
53}
54
55static void virtio_gpu_ctx_id_get(struct virtio_gpu_device *vgdev,
56 uint32_t *resid)
57{
58 int handle;
59
60 idr_preload(GFP_KERNEL);
61 spin_lock(&vgdev->ctx_id_idr_lock);
62 handle = idr_alloc(&vgdev->ctx_id_idr, NULL, 1, 0, 0);
63 spin_unlock(&vgdev->ctx_id_idr_lock);
64 idr_preload_end();
65 *resid = handle;
66}
67
68static void virtio_gpu_ctx_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
69{
70 spin_lock(&vgdev->ctx_id_idr_lock);
71 idr_remove(&vgdev->ctx_id_idr, id);
72 spin_unlock(&vgdev->ctx_id_idr_lock);
73}
74
75static void virtio_gpu_context_create(struct virtio_gpu_device *vgdev,
76 uint32_t nlen, const char *name,
77 uint32_t *ctx_id)
78{
79 virtio_gpu_ctx_id_get(vgdev, ctx_id);
80 virtio_gpu_cmd_context_create(vgdev, *ctx_id, nlen, name);
81}
82
83static void virtio_gpu_context_destroy(struct virtio_gpu_device *vgdev,
84 uint32_t ctx_id)
85{
86 virtio_gpu_cmd_context_destroy(vgdev, ctx_id);
87 virtio_gpu_ctx_id_put(vgdev, ctx_id);
88}
89
90static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq,
91 void (*work_func)(struct work_struct *work))
92{
93 spin_lock_init(&vgvq->qlock);
94 init_waitqueue_head(&vgvq->ack_queue);
95 INIT_WORK(&vgvq->dequeue_work, work_func);
96}
97
98static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev,
99 int num_capsets)
100{
101 int i, ret;
102
103 vgdev->capsets = kcalloc(num_capsets,
104 sizeof(struct virtio_gpu_drv_capset),
105 GFP_KERNEL);
106 if (!vgdev->capsets) {
107 DRM_ERROR("failed to allocate cap sets\n");
108 return;
109 }
110 for (i = 0; i < num_capsets; i++) {
111 virtio_gpu_cmd_get_capset_info(vgdev, i);
112 ret = wait_event_timeout(vgdev->resp_wq,
113 vgdev->capsets[i].id > 0, 5 * HZ);
114 if (ret == 0) {
115 DRM_ERROR("timed out waiting for cap set %d\n", i);
116 kfree(vgdev->capsets);
117 vgdev->capsets = NULL;
118 return;
119 }
120 DRM_INFO("cap set %d: id %d, max-version %d, max-size %d\n",
121 i, vgdev->capsets[i].id,
122 vgdev->capsets[i].max_version,
123 vgdev->capsets[i].max_size);
124 }
125 vgdev->num_capsets = num_capsets;
126}
127
128int virtio_gpu_driver_load(struct drm_device *dev, unsigned long flags)
129{
130 static vq_callback_t *callbacks[] = {
131 virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack
132 };
133 static const char * const names[] = { "control", "cursor" };
134
135 struct virtio_gpu_device *vgdev;
136 /* this will expand later */
137 struct virtqueue *vqs[2];
138 u32 num_scanouts, num_capsets;
139 int ret;
140
141 if (!virtio_has_feature(dev->virtdev, VIRTIO_F_VERSION_1))
142 return -ENODEV;
143
144 vgdev = kzalloc(sizeof(struct virtio_gpu_device), GFP_KERNEL);
145 if (!vgdev)
146 return -ENOMEM;
147
148 vgdev->ddev = dev;
149 dev->dev_private = vgdev;
150 vgdev->vdev = dev->virtdev;
151 vgdev->dev = dev->dev;
152
153 spin_lock_init(&vgdev->display_info_lock);
154 spin_lock_init(&vgdev->ctx_id_idr_lock);
155 idr_init(&vgdev->ctx_id_idr);
156 spin_lock_init(&vgdev->resource_idr_lock);
157 idr_init(&vgdev->resource_idr);
158 init_waitqueue_head(&vgdev->resp_wq);
159 virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func);
160 virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func);
161
162 spin_lock_init(&vgdev->fence_drv.lock);
163 INIT_LIST_HEAD(&vgdev->fence_drv.fences);
164 INIT_LIST_HEAD(&vgdev->cap_cache);
165 INIT_WORK(&vgdev->config_changed_work,
166 virtio_gpu_config_changed_work_func);
167
168 if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_VIRGL))
169 vgdev->has_virgl_3d = true;
170 DRM_INFO("virgl 3d acceleration %s\n",
171 vgdev->has_virgl_3d ? "enabled" : "not available");
172
173 ret = vgdev->vdev->config->find_vqs(vgdev->vdev, 2, vqs,
174 callbacks, names);
175 if (ret) {
176 DRM_ERROR("failed to find virt queues\n");
177 goto err_vqs;
178 }
179 vgdev->ctrlq.vq = vqs[0];
180 vgdev->cursorq.vq = vqs[1];
181 ret = virtio_gpu_alloc_vbufs(vgdev);
182 if (ret) {
183 DRM_ERROR("failed to alloc vbufs\n");
184 goto err_vbufs;
185 }
186
187 ret = virtio_gpu_ttm_init(vgdev);
188 if (ret) {
189 DRM_ERROR("failed to init ttm %d\n", ret);
190 goto err_ttm;
191 }
192
193 /* get display info */
194 virtio_cread(vgdev->vdev, struct virtio_gpu_config,
195 num_scanouts, &num_scanouts);
196 vgdev->num_scanouts = min_t(uint32_t, num_scanouts,
197 VIRTIO_GPU_MAX_SCANOUTS);
198 if (!vgdev->num_scanouts) {
199 DRM_ERROR("num_scanouts is zero\n");
200 ret = -EINVAL;
201 goto err_scanouts;
202 }
203 DRM_INFO("number of scanouts: %d\n", num_scanouts);
204
205 virtio_cread(vgdev->vdev, struct virtio_gpu_config,
206 num_capsets, &num_capsets);
207 DRM_INFO("number of cap sets: %d\n", num_capsets);
208
209 ret = virtio_gpu_modeset_init(vgdev);
210 if (ret)
211 goto err_modeset;
212
213 virtio_device_ready(vgdev->vdev);
214 vgdev->vqs_ready = true;
215
216 if (num_capsets)
217 virtio_gpu_get_capsets(vgdev, num_capsets);
218 virtio_gpu_cmd_get_display_info(vgdev);
219 wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending,
220 5 * HZ);
221 if (virtio_gpu_fbdev)
222 virtio_gpu_fbdev_init(vgdev);
223
224 return 0;
225
226err_modeset:
227err_scanouts:
228 virtio_gpu_ttm_fini(vgdev);
229err_ttm:
230 virtio_gpu_free_vbufs(vgdev);
231err_vbufs:
232 vgdev->vdev->config->del_vqs(vgdev->vdev);
233err_vqs:
234 kfree(vgdev);
235 return ret;
236}
237
238static void virtio_gpu_cleanup_cap_cache(struct virtio_gpu_device *vgdev)
239{
240 struct virtio_gpu_drv_cap_cache *cache_ent, *tmp;
241
242 list_for_each_entry_safe(cache_ent, tmp, &vgdev->cap_cache, head) {
243 kfree(cache_ent->caps_cache);
244 kfree(cache_ent);
245 }
246}
247
248int virtio_gpu_driver_unload(struct drm_device *dev)
249{
250 struct virtio_gpu_device *vgdev = dev->dev_private;
251
252 vgdev->vqs_ready = false;
253 flush_work(&vgdev->ctrlq.dequeue_work);
254 flush_work(&vgdev->cursorq.dequeue_work);
255 flush_work(&vgdev->config_changed_work);
256 vgdev->vdev->config->del_vqs(vgdev->vdev);
257
258 virtio_gpu_modeset_fini(vgdev);
259 virtio_gpu_ttm_fini(vgdev);
260 virtio_gpu_free_vbufs(vgdev);
261 virtio_gpu_cleanup_cap_cache(vgdev);
262 kfree(vgdev->capsets);
263 kfree(vgdev);
264 return 0;
265}
266
267int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
268{
269 struct virtio_gpu_device *vgdev = dev->dev_private;
270 struct virtio_gpu_fpriv *vfpriv;
271 uint32_t id;
272 char dbgname[64], tmpname[TASK_COMM_LEN];
273
274 /* can't create contexts without 3d renderer */
275 if (!vgdev->has_virgl_3d)
276 return 0;
277
278 get_task_comm(tmpname, current);
279 snprintf(dbgname, sizeof(dbgname), "%s", tmpname);
280 dbgname[63] = 0;
281 /* allocate a virt GPU context for this opener */
282 vfpriv = kzalloc(sizeof(*vfpriv), GFP_KERNEL);
283 if (!vfpriv)
284 return -ENOMEM;
285
286 virtio_gpu_context_create(vgdev, strlen(dbgname), dbgname, &id);
287
288 vfpriv->ctx_id = id;
289 file->driver_priv = vfpriv;
290 return 0;
291}
292
293void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file)
294{
295 struct virtio_gpu_device *vgdev = dev->dev_private;
296 struct virtio_gpu_fpriv *vfpriv;
297
298 if (!vgdev->has_virgl_3d)
299 return;
300
301 vfpriv = file->driver_priv;
302
303 virtio_gpu_context_destroy(vgdev, vfpriv->ctx_id);
304 kfree(vfpriv);
305 file->driver_priv = NULL;
306}
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
29#include <drm/drm_file.h>
30
31#include "virtgpu_drv.h"
32
33static void virtio_gpu_config_changed_work_func(struct work_struct *work)
34{
35 struct virtio_gpu_device *vgdev =
36 container_of(work, struct virtio_gpu_device,
37 config_changed_work);
38 u32 events_read, events_clear = 0;
39
40 /* read the config space */
41 virtio_cread(vgdev->vdev, struct virtio_gpu_config,
42 events_read, &events_read);
43 if (events_read & VIRTIO_GPU_EVENT_DISPLAY) {
44 if (vgdev->has_edid)
45 virtio_gpu_cmd_get_edids(vgdev);
46 virtio_gpu_cmd_get_display_info(vgdev);
47 drm_helper_hpd_irq_event(vgdev->ddev);
48 events_clear |= VIRTIO_GPU_EVENT_DISPLAY;
49 }
50 virtio_cwrite(vgdev->vdev, struct virtio_gpu_config,
51 events_clear, &events_clear);
52}
53
54static int virtio_gpu_context_create(struct virtio_gpu_device *vgdev,
55 uint32_t nlen, const char *name)
56{
57 int handle = ida_alloc(&vgdev->ctx_id_ida, GFP_KERNEL);
58
59 if (handle < 0)
60 return handle;
61 handle += 1;
62 virtio_gpu_cmd_context_create(vgdev, handle, nlen, name);
63 return handle;
64}
65
66static void virtio_gpu_context_destroy(struct virtio_gpu_device *vgdev,
67 uint32_t ctx_id)
68{
69 virtio_gpu_cmd_context_destroy(vgdev, ctx_id);
70 ida_free(&vgdev->ctx_id_ida, ctx_id - 1);
71}
72
73static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq,
74 void (*work_func)(struct work_struct *work))
75{
76 spin_lock_init(&vgvq->qlock);
77 init_waitqueue_head(&vgvq->ack_queue);
78 INIT_WORK(&vgvq->dequeue_work, work_func);
79}
80
81static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev,
82 int num_capsets)
83{
84 int i, ret;
85
86 vgdev->capsets = kcalloc(num_capsets,
87 sizeof(struct virtio_gpu_drv_capset),
88 GFP_KERNEL);
89 if (!vgdev->capsets) {
90 DRM_ERROR("failed to allocate cap sets\n");
91 return;
92 }
93 for (i = 0; i < num_capsets; i++) {
94 virtio_gpu_cmd_get_capset_info(vgdev, i);
95 ret = wait_event_timeout(vgdev->resp_wq,
96 vgdev->capsets[i].id > 0, 5 * HZ);
97 if (ret == 0) {
98 DRM_ERROR("timed out waiting for cap set %d\n", i);
99 kfree(vgdev->capsets);
100 vgdev->capsets = NULL;
101 return;
102 }
103 DRM_INFO("cap set %d: id %d, max-version %d, max-size %d\n",
104 i, vgdev->capsets[i].id,
105 vgdev->capsets[i].max_version,
106 vgdev->capsets[i].max_size);
107 }
108 vgdev->num_capsets = num_capsets;
109}
110
111int virtio_gpu_init(struct drm_device *dev)
112{
113 static vq_callback_t *callbacks[] = {
114 virtio_gpu_ctrl_ack, virtio_gpu_cursor_ack
115 };
116 static const char * const names[] = { "control", "cursor" };
117
118 struct virtio_gpu_device *vgdev;
119 /* this will expand later */
120 struct virtqueue *vqs[2];
121 u32 num_scanouts, num_capsets;
122 int ret;
123
124 if (!virtio_has_feature(dev_to_virtio(dev->dev), VIRTIO_F_VERSION_1))
125 return -ENODEV;
126
127 vgdev = kzalloc(sizeof(struct virtio_gpu_device), GFP_KERNEL);
128 if (!vgdev)
129 return -ENOMEM;
130
131 vgdev->ddev = dev;
132 dev->dev_private = vgdev;
133 vgdev->vdev = dev_to_virtio(dev->dev);
134 vgdev->dev = dev->dev;
135
136 spin_lock_init(&vgdev->display_info_lock);
137 ida_init(&vgdev->ctx_id_ida);
138 ida_init(&vgdev->resource_ida);
139 init_waitqueue_head(&vgdev->resp_wq);
140 virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func);
141 virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func);
142
143 vgdev->fence_drv.context = dma_fence_context_alloc(1);
144 spin_lock_init(&vgdev->fence_drv.lock);
145 INIT_LIST_HEAD(&vgdev->fence_drv.fences);
146 INIT_LIST_HEAD(&vgdev->cap_cache);
147 INIT_WORK(&vgdev->config_changed_work,
148 virtio_gpu_config_changed_work_func);
149
150#ifdef __LITTLE_ENDIAN
151 if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_VIRGL))
152 vgdev->has_virgl_3d = true;
153 DRM_INFO("virgl 3d acceleration %s\n",
154 vgdev->has_virgl_3d ? "enabled" : "not supported by host");
155#else
156 DRM_INFO("virgl 3d acceleration not supported by guest\n");
157#endif
158 if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_EDID)) {
159 vgdev->has_edid = true;
160 DRM_INFO("EDID support available.\n");
161 }
162
163 ret = virtio_find_vqs(vgdev->vdev, 2, vqs, callbacks, names, NULL);
164 if (ret) {
165 DRM_ERROR("failed to find virt queues\n");
166 goto err_vqs;
167 }
168 vgdev->ctrlq.vq = vqs[0];
169 vgdev->cursorq.vq = vqs[1];
170 ret = virtio_gpu_alloc_vbufs(vgdev);
171 if (ret) {
172 DRM_ERROR("failed to alloc vbufs\n");
173 goto err_vbufs;
174 }
175
176 ret = virtio_gpu_ttm_init(vgdev);
177 if (ret) {
178 DRM_ERROR("failed to init ttm %d\n", ret);
179 goto err_ttm;
180 }
181
182 /* get display info */
183 virtio_cread(vgdev->vdev, struct virtio_gpu_config,
184 num_scanouts, &num_scanouts);
185 vgdev->num_scanouts = min_t(uint32_t, num_scanouts,
186 VIRTIO_GPU_MAX_SCANOUTS);
187 if (!vgdev->num_scanouts) {
188 DRM_ERROR("num_scanouts is zero\n");
189 ret = -EINVAL;
190 goto err_scanouts;
191 }
192 DRM_INFO("number of scanouts: %d\n", num_scanouts);
193
194 virtio_cread(vgdev->vdev, struct virtio_gpu_config,
195 num_capsets, &num_capsets);
196 DRM_INFO("number of cap sets: %d\n", num_capsets);
197
198 virtio_gpu_modeset_init(vgdev);
199
200 virtio_device_ready(vgdev->vdev);
201 vgdev->vqs_ready = true;
202
203 if (num_capsets)
204 virtio_gpu_get_capsets(vgdev, num_capsets);
205 if (vgdev->has_edid)
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,
209 5 * HZ);
210 return 0;
211
212err_scanouts:
213 virtio_gpu_ttm_fini(vgdev);
214err_ttm:
215 virtio_gpu_free_vbufs(vgdev);
216err_vbufs:
217 vgdev->vdev->config->del_vqs(vgdev->vdev);
218err_vqs:
219 kfree(vgdev);
220 return ret;
221}
222
223static void virtio_gpu_cleanup_cap_cache(struct virtio_gpu_device *vgdev)
224{
225 struct virtio_gpu_drv_cap_cache *cache_ent, *tmp;
226
227 list_for_each_entry_safe(cache_ent, tmp, &vgdev->cap_cache, head) {
228 kfree(cache_ent->caps_cache);
229 kfree(cache_ent);
230 }
231}
232
233void virtio_gpu_deinit(struct drm_device *dev)
234{
235 struct virtio_gpu_device *vgdev = dev->dev_private;
236
237 vgdev->vqs_ready = false;
238 flush_work(&vgdev->ctrlq.dequeue_work);
239 flush_work(&vgdev->cursorq.dequeue_work);
240 flush_work(&vgdev->config_changed_work);
241 vgdev->vdev->config->reset(vgdev->vdev);
242 vgdev->vdev->config->del_vqs(vgdev->vdev);
243
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);
249 kfree(vgdev);
250}
251
252int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
253{
254 struct virtio_gpu_device *vgdev = dev->dev_private;
255 struct virtio_gpu_fpriv *vfpriv;
256 int id;
257 char dbgname[TASK_COMM_LEN];
258
259 /* can't create contexts without 3d renderer */
260 if (!vgdev->has_virgl_3d)
261 return 0;
262
263 /* allocate a virt GPU context for this opener */
264 vfpriv = kzalloc(sizeof(*vfpriv), GFP_KERNEL);
265 if (!vfpriv)
266 return -ENOMEM;
267
268 get_task_comm(dbgname, current);
269 id = virtio_gpu_context_create(vgdev, strlen(dbgname), dbgname);
270 if (id < 0) {
271 kfree(vfpriv);
272 return id;
273 }
274
275 vfpriv->ctx_id = id;
276 file->driver_priv = vfpriv;
277 return 0;
278}
279
280void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file)
281{
282 struct virtio_gpu_device *vgdev = dev->dev_private;
283 struct virtio_gpu_fpriv *vfpriv;
284
285 if (!vgdev->has_virgl_3d)
286 return;
287
288 vfpriv = file->driver_priv;
289
290 virtio_gpu_context_destroy(vgdev, vfpriv->ctx_id);
291 kfree(vfpriv);
292 file->driver_priv = NULL;
293}