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_mode_dumb_mmap(struct drm_file *file_priv,
103			      struct drm_device *dev,
104			      uint32_t handle, uint64_t *offset_p)
105{
106	struct drm_gem_object *gobj;
107
108	BUG_ON(!offset_p);
109	gobj = drm_gem_object_lookup(file_priv, handle);
110	if (gobj == NULL)
111		return -ENOENT;
112	*offset_p = drm_vma_node_offset_addr(&gobj->vma_node);
113	drm_gem_object_put(gobj);
114	return 0;
115}
116
117int virtio_gpu_gem_object_open(struct drm_gem_object *obj,
118			       struct drm_file *file)
119{
120	struct virtio_gpu_device *vgdev = obj->dev->dev_private;
121	struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
122	struct virtio_gpu_object_array *objs;
123
124	if (!vgdev->has_virgl_3d)
125		goto out_notify;
126
127	/* the context might still be missing when the first ioctl is
128	 * DRM_IOCTL_MODE_CREATE_DUMB or DRM_IOCTL_PRIME_FD_TO_HANDLE
129	 */
130	virtio_gpu_create_context(obj->dev, file);
131
132	objs = virtio_gpu_array_alloc(1);
133	if (!objs)
134		return -ENOMEM;
135	virtio_gpu_array_add_obj(objs, obj);
136
137	virtio_gpu_cmd_context_attach_resource(vgdev, vfpriv->ctx_id,
138					       objs);
139out_notify:
140	virtio_gpu_notify(vgdev);
141	return 0;
142}
143
144void virtio_gpu_gem_object_close(struct drm_gem_object *obj,
145				 struct drm_file *file)
146{
147	struct virtio_gpu_device *vgdev = obj->dev->dev_private;
148	struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
149	struct virtio_gpu_object_array *objs;
150
151	if (!vgdev->has_virgl_3d)
152		return;
153
154	objs = virtio_gpu_array_alloc(1);
155	if (!objs)
156		return;
157	virtio_gpu_array_add_obj(objs, obj);
158
159	virtio_gpu_cmd_context_detach_resource(vgdev, vfpriv->ctx_id,
160					       objs);
161	virtio_gpu_notify(vgdev);
162}
163
164struct virtio_gpu_object_array *virtio_gpu_array_alloc(u32 nents)
165{
166	struct virtio_gpu_object_array *objs;
167
168	objs = kmalloc(struct_size(objs, objs, nents), GFP_KERNEL);
169	if (!objs)
170		return NULL;
171
172	objs->nents = 0;
173	objs->total = nents;
174	return objs;
175}
176
177static void virtio_gpu_array_free(struct virtio_gpu_object_array *objs)
178{
179	kfree(objs);
180}
181
182struct virtio_gpu_object_array*
183virtio_gpu_array_from_handles(struct drm_file *drm_file, u32 *handles, u32 nents)
184{
185	struct virtio_gpu_object_array *objs;
186	u32 i;
187
188	objs = virtio_gpu_array_alloc(nents);
189	if (!objs)
190		return NULL;
191
192	for (i = 0; i < nents; i++) {
193		objs->objs[i] = drm_gem_object_lookup(drm_file, handles[i]);
194		if (!objs->objs[i]) {
195			objs->nents = i;
196			virtio_gpu_array_put_free(objs);
197			return NULL;
198		}
199	}
200	objs->nents = i;
201	return objs;
202}
203
204void virtio_gpu_array_add_obj(struct virtio_gpu_object_array *objs,
205			      struct drm_gem_object *obj)
206{
207	if (WARN_ON_ONCE(objs->nents == objs->total))
208		return;
209
210	drm_gem_object_get(obj);
211	objs->objs[objs->nents] = obj;
212	objs->nents++;
213}
214
215int virtio_gpu_array_lock_resv(struct virtio_gpu_object_array *objs)
216{
217	unsigned int i;
218	int ret;
219
220	if (objs->nents == 1) {
221		ret = dma_resv_lock_interruptible(objs->objs[0]->resv, NULL);
222	} else {
223		ret = drm_gem_lock_reservations(objs->objs, objs->nents,
224						&objs->ticket);
225	}
226	if (ret)
227		return ret;
228
229	for (i = 0; i < objs->nents; ++i) {
230		ret = dma_resv_reserve_fences(objs->objs[i]->resv, 1);
231		if (ret) {
232			virtio_gpu_array_unlock_resv(objs);
233			return ret;
234		}
235	}
236	return ret;
237}
238
239void virtio_gpu_array_unlock_resv(struct virtio_gpu_object_array *objs)
240{
241	if (objs->nents == 1) {
242		dma_resv_unlock(objs->objs[0]->resv);
243	} else {
244		drm_gem_unlock_reservations(objs->objs, objs->nents,
245					    &objs->ticket);
246	}
247}
248
249void virtio_gpu_array_add_fence(struct virtio_gpu_object_array *objs,
250				struct dma_fence *fence)
251{
252	int i;
253
254	for (i = 0; i < objs->nents; i++)
255		dma_resv_add_fence(objs->objs[i]->resv, fence,
256				   DMA_RESV_USAGE_WRITE);
257}
258
259void virtio_gpu_array_put_free(struct virtio_gpu_object_array *objs)
260{
261	u32 i;
262
263	if (!objs)
264		return;
265
266	for (i = 0; i < objs->nents; i++)
267		drm_gem_object_put(objs->objs[i]);
268	virtio_gpu_array_free(objs);
269}
270
271void virtio_gpu_array_put_free_delayed(struct virtio_gpu_device *vgdev,
272				       struct virtio_gpu_object_array *objs)
273{
274	spin_lock(&vgdev->obj_free_lock);
275	list_add_tail(&objs->next, &vgdev->obj_free_list);
276	spin_unlock(&vgdev->obj_free_lock);
277	schedule_work(&vgdev->obj_free_work);
278}
279
280void virtio_gpu_array_put_free_work(struct work_struct *work)
281{
282	struct virtio_gpu_device *vgdev =
283		container_of(work, struct virtio_gpu_device, obj_free_work);
284	struct virtio_gpu_object_array *objs;
285
286	spin_lock(&vgdev->obj_free_lock);
287	while (!list_empty(&vgdev->obj_free_list)) {
288		objs = list_first_entry(&vgdev->obj_free_list,
289					struct virtio_gpu_object_array, next);
290		list_del(&objs->next);
291		spin_unlock(&vgdev->obj_free_lock);
292		virtio_gpu_array_put_free(objs);
293		spin_lock(&vgdev->obj_free_lock);
294	}
295	spin_unlock(&vgdev->obj_free_lock);
296}
297