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 
31 static 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 
61 int 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 
98 fail:
99 	return ret;
100 }
101 
102 int 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 
117 int 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);
139 out_notify:
140 	virtio_gpu_notify(vgdev);
141 	return 0;
142 }
143 
144 void 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 
164 struct 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 
177 static void virtio_gpu_array_free(struct virtio_gpu_object_array *objs)
178 {
179 	kfree(objs);
180 }
181 
182 struct virtio_gpu_object_array*
183 virtio_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 
204 void 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 
215 int 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 
239 void 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 
249 void 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 
259 void 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 
271 void 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 
280 void 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