virtgpu_gem.c

  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 <drm/drm_file.h>
 27#include <drm/drm_fourcc.h>
 28
 29#include "virtgpu_drv.h"
 30
 31static int virtio_gpu_gem_create(struct drm_file *file,
 32				 struct drm_device *dev,
 33				 struct virtio_gpu_object_params *params,
 34				 struct drm_gem_object **obj_p,
 35				 uint32_t *handle_p)
 36{
 37	struct virtio_gpu_device *vgdev = dev->dev_private;
 38	struct virtio_gpu_object *obj;
 39	int ret;
 40	u32 handle;
 41
 42	ret = virtio_gpu_object_create(vgdev, params, &obj, NULL);
 43	if (ret < 0)
 44		return ret;
 45
 46	ret = drm_gem_handle_create(file, &obj->base.base, &handle);
 47	if (ret) {
 48		drm_gem_object_release(&obj->base.base);
 49		return ret;
 50	}
 51
 52	*obj_p = &obj->base.base;
 53
 54	/* drop reference from allocate - handle holds it now */
 55	drm_gem_object_put(&obj->base.base);
 56
 57	*handle_p = handle;
 58	return 0;
 59}
 60
 61int virtio_gpu_mode_dumb_create(struct drm_file *file_priv,
 62				struct drm_device *dev,
 63				struct drm_mode_create_dumb *args)
 64{
 65	struct drm_gem_object *gobj;
 66	struct virtio_gpu_object_params params = { 0 };
 67	struct virtio_gpu_device *vgdev = dev->dev_private;
 68	int ret;
 69	uint32_t pitch;
 70
 71	if (args->bpp != 32)
 72		return -EINVAL;
 73
 74	pitch = args->width * 4;
 75	args->size = pitch * args->height;
 76	args->size = ALIGN(args->size, PAGE_SIZE);
 77
 78	params.format = virtio_gpu_translate_format(DRM_FORMAT_HOST_XRGB8888);
 79	params.width = args->width;
 80	params.height = args->height;
 81	params.size = args->size;
 82	params.dumb = true;
 83
 84	if (vgdev->has_resource_blob && !vgdev->has_virgl_3d) {
 85		params.blob_mem = VIRTGPU_BLOB_MEM_GUEST;
 86		params.blob_flags = VIRTGPU_BLOB_FLAG_USE_SHAREABLE;
 87		params.blob = true;
 88	}
 89
 90	ret = virtio_gpu_gem_create(file_priv, dev, &params, &gobj,
 91				    &args->handle);
 92	if (ret)
 93		goto fail;
 94
 95	args->pitch = pitch;
 96	return ret;
 97
 98fail:
 99	return ret;
100}
101
102int virtio_gpu_gem_object_open(struct drm_gem_object *obj,
103			       struct drm_file *file)
104{
105	struct virtio_gpu_device *vgdev = obj->dev->dev_private;
106	struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
107	struct virtio_gpu_object_array *objs;
108
109	if (!vgdev->has_virgl_3d)
110		goto out_notify;
111
112	/* the context might still be missing when the first ioctl is
113	 * DRM_IOCTL_MODE_CREATE_DUMB or DRM_IOCTL_PRIME_FD_TO_HANDLE
114	 */
115	if (!vgdev->has_context_init)
116		virtio_gpu_create_context(obj->dev, file);
117
118	if (vfpriv->context_created) {
119		objs = virtio_gpu_array_alloc(1);
120		if (!objs)
121			return -ENOMEM;
122		virtio_gpu_array_add_obj(objs, obj);
123
124		virtio_gpu_cmd_context_attach_resource(vgdev, vfpriv->ctx_id, objs);
125	}
126
127out_notify:
128	virtio_gpu_notify(vgdev);
129	return 0;
130}
131
132void virtio_gpu_gem_object_close(struct drm_gem_object *obj,
133				 struct drm_file *file)
134{
135	struct virtio_gpu_device *vgdev = obj->dev->dev_private;
136	struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
137	struct virtio_gpu_object_array *objs;
138
139	if (!vgdev->has_virgl_3d)
140		return;
141
142	objs = virtio_gpu_array_alloc(1);
143	if (!objs)
144		return;
145	virtio_gpu_array_add_obj(objs, obj);
146
147	virtio_gpu_cmd_context_detach_resource(vgdev, vfpriv->ctx_id,
148					       objs);
149	virtio_gpu_notify(vgdev);
150}
151
152/* For drm panic */
153struct virtio_gpu_object_array *virtio_gpu_panic_array_alloc(void)
154{
155	struct virtio_gpu_object_array *objs;
156
157	objs = kmalloc(sizeof(struct virtio_gpu_object_array), GFP_ATOMIC);
158	if (!objs)
159		return NULL;
160
161	objs->nents = 0;
162	objs->total = 1;
163	return objs;
164}
165
166struct virtio_gpu_object_array *virtio_gpu_array_alloc(u32 nents)
167{
168	struct virtio_gpu_object_array *objs;
169
170	objs = kmalloc(struct_size(objs, objs, nents), GFP_KERNEL);
171	if (!objs)
172		return NULL;
173
174	objs->nents = 0;
175	objs->total = nents;
176	return objs;
177}
178
179static void virtio_gpu_array_free(struct virtio_gpu_object_array *objs)
180{
181	kfree(objs);
182}
183
184struct virtio_gpu_object_array*
185virtio_gpu_array_from_handles(struct drm_file *drm_file, u32 *handles, u32 nents)
186{
187	struct virtio_gpu_object_array *objs;
188	u32 i;
189
190	objs = virtio_gpu_array_alloc(nents);
191	if (!objs)
192		return NULL;
193
194	for (i = 0; i < nents; i++) {
195		objs->objs[i] = drm_gem_object_lookup(drm_file, handles[i]);
196		if (!objs->objs[i]) {
197			objs->nents = i;
198			virtio_gpu_array_put_free(objs);
199			return NULL;
200		}
201	}
202	objs->nents = i;
203	return objs;
204}
205
206void virtio_gpu_array_add_obj(struct virtio_gpu_object_array *objs,
207			      struct drm_gem_object *obj)
208{
209	if (WARN_ON_ONCE(objs->nents == objs->total))
210		return;
211
212	drm_gem_object_get(obj);
213	objs->objs[objs->nents] = obj;
214	objs->nents++;
215}
216
217int virtio_gpu_array_lock_resv(struct virtio_gpu_object_array *objs)
218{
219	unsigned int i;
220	int ret;
221
222	if (objs->nents == 1) {
223		ret = dma_resv_lock_interruptible(objs->objs[0]->resv, NULL);
224	} else {
225		ret = drm_gem_lock_reservations(objs->objs, objs->nents,
226						&objs->ticket);
227	}
228	if (ret)
229		return ret;
230
231	for (i = 0; i < objs->nents; ++i) {
232		ret = dma_resv_reserve_fences(objs->objs[i]->resv, 1);
233		if (ret) {
234			virtio_gpu_array_unlock_resv(objs);
235			return ret;
236		}
237	}
238	return ret;
239}
240
241void virtio_gpu_array_unlock_resv(struct virtio_gpu_object_array *objs)
242{
243	if (objs->nents == 1) {
244		dma_resv_unlock(objs->objs[0]->resv);
245	} else {
246		drm_gem_unlock_reservations(objs->objs, objs->nents,
247					    &objs->ticket);
248	}
249}
250
251void virtio_gpu_array_add_fence(struct virtio_gpu_object_array *objs,
252				struct dma_fence *fence)
253{
254	int i;
255
256	for (i = 0; i < objs->nents; i++)
257		dma_resv_add_fence(objs->objs[i]->resv, fence,
258				   DMA_RESV_USAGE_WRITE);
259}
260
261void virtio_gpu_array_put_free(struct virtio_gpu_object_array *objs)
262{
263	u32 i;
264
265	if (!objs)
266		return;
267
268	for (i = 0; i < objs->nents; i++)
269		drm_gem_object_put(objs->objs[i]);
270	virtio_gpu_array_free(objs);
271}
272
273void virtio_gpu_array_put_free_delayed(struct virtio_gpu_device *vgdev,
274				       struct virtio_gpu_object_array *objs)
275{
276	spin_lock(&vgdev->obj_free_lock);
277	list_add_tail(&objs->next, &vgdev->obj_free_list);
278	spin_unlock(&vgdev->obj_free_lock);
279	schedule_work(&vgdev->obj_free_work);
280}
281
282void virtio_gpu_array_put_free_work(struct work_struct *work)
283{
284	struct virtio_gpu_device *vgdev =
285		container_of(work, struct virtio_gpu_device, obj_free_work);
286	struct virtio_gpu_object_array *objs;
287
288	spin_lock(&vgdev->obj_free_lock);
289	while (!list_empty(&vgdev->obj_free_list)) {
290		objs = list_first_entry(&vgdev->obj_free_list,
291					struct virtio_gpu_object_array, next);
292		list_del(&objs->next);
293		spin_unlock(&vgdev->obj_free_lock);
294		virtio_gpu_array_put_free(objs);
295		spin_lock(&vgdev->obj_free_lock);
296	}
297	spin_unlock(&vgdev->obj_free_lock);
298}