summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/virtio/virtgpu_object.c
blob: d69a5b6da55320c7e10ab88d6baa49f50c4c6e7d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
/*
 * Copyright (C) 2015 Red Hat, Inc.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include <linux/dma-mapping.h>
#include <linux/moduleparam.h>

#include "virtgpu_drv.h"

static int virtio_gpu_virglrenderer_workaround = 1;
module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400);

int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev, uint32_t *resid)
{
	if (virtio_gpu_virglrenderer_workaround) {
		/*
		 * Hack to avoid re-using resource IDs.
		 *
		 * virglrenderer versions up to (and including) 0.7.0
		 * can't deal with that.  virglrenderer commit
		 * "f91a9dd35715 Fix unlinking resources from hash
		 * table." (Feb 2019) fixes the bug.
		 */
		static atomic_t seqno = ATOMIC_INIT(0);
		int handle = atomic_inc_return(&seqno);
		*resid = handle + 1;
	} else {
		int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
		if (handle < 0)
			return handle;
		*resid = handle + 1;
	}
	return 0;
}

static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
{
	if (!virtio_gpu_virglrenderer_workaround) {
		ida_free(&vgdev->resource_ida, id - 1);
	}
}

void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo)
{
	struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;

	virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
	if (virtio_gpu_is_shmem(bo)) {
		struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);

		if (shmem->pages) {
			if (shmem->mapped) {
				dma_unmap_sgtable(vgdev->vdev->dev.parent,
					     shmem->pages, DMA_TO_DEVICE, 0);
				shmem->mapped = 0;
			}

			sg_free_table(shmem->pages);
			kfree(shmem->pages);
			shmem->pages = NULL;
			drm_gem_shmem_unpin(&bo->base.base);
		}

		drm_gem_shmem_free_object(&bo->base.base);
	} else if (virtio_gpu_is_vram(bo)) {
		struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);

		spin_lock(&vgdev->host_visible_lock);
		if (drm_mm_node_allocated(&vram->vram_node))
			drm_mm_remove_node(&vram->vram_node);

		spin_unlock(&vgdev->host_visible_lock);

		drm_gem_free_mmap_offset(&vram->base.base.base);
		drm_gem_object_release(&vram->base.base.base);
		kfree(vram);
	}
}

static void virtio_gpu_free_object(struct drm_gem_object *obj)
{
	struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
	struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;

	if (bo->created) {
		virtio_gpu_cmd_unref_resource(vgdev, bo);
		virtio_gpu_notify(vgdev);
		/* completion handler calls virtio_gpu_cleanup_object() */
		return;
	}
	virtio_gpu_cleanup_object(bo);
}

static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
	.free = virtio_gpu_free_object,
	.open = virtio_gpu_gem_object_open,
	.close = virtio_gpu_gem_object_close,

	.print_info = drm_gem_shmem_print_info,
	.export = virtgpu_gem_prime_export,
	.pin = drm_gem_shmem_pin,
	.unpin = drm_gem_shmem_unpin,
	.get_sg_table = drm_gem_shmem_get_sg_table,
	.vmap = drm_gem_shmem_vmap,
	.vunmap = drm_gem_shmem_vunmap,
	.mmap = drm_gem_shmem_mmap,
};

bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo)
{
	return bo->base.base.funcs == &virtio_gpu_shmem_funcs;
}

struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
						size_t size)
{
	struct virtio_gpu_object_shmem *shmem;
	struct drm_gem_shmem_object *dshmem;

	shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);
	if (!shmem)
		return NULL;

	dshmem = &shmem->base.base;
	dshmem->base.funcs = &virtio_gpu_shmem_funcs;
	return &dshmem->base;
}

static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
					struct virtio_gpu_object *bo,
					struct virtio_gpu_mem_entry **ents,
					unsigned int *nents)
{
	bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
	struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
	struct scatterlist *sg;
	int si, ret;

	ret = drm_gem_shmem_pin(&bo->base.base);
	if (ret < 0)
		return -EINVAL;

	/*
	 * virtio_gpu uses drm_gem_shmem_get_sg_table instead of
	 * drm_gem_shmem_get_pages_sgt because virtio has it's own set of
	 * dma-ops. This is discouraged for other drivers, but should be fine
	 * since virtio_gpu doesn't support dma-buf import from other devices.
	 */
	shmem->pages = drm_gem_shmem_get_sg_table(&bo->base.base);
	if (!shmem->pages) {
		drm_gem_shmem_unpin(&bo->base.base);
		return -EINVAL;
	}

	if (use_dma_api) {
		ret = dma_map_sgtable(vgdev->vdev->dev.parent,
				      shmem->pages, DMA_TO_DEVICE, 0);
		if (ret)
			return ret;
		*nents = shmem->mapped = shmem->pages->nents;
	} else {
		*nents = shmem->pages->orig_nents;
	}

	*ents = kvmalloc_array(*nents,
			       sizeof(struct virtio_gpu_mem_entry),
			       GFP_KERNEL);
	if (!(*ents)) {
		DRM_ERROR("failed to allocate ent list\n");
		return -ENOMEM;
	}

	if (use_dma_api) {
		for_each_sgtable_dma_sg(shmem->pages, sg, si) {
			(*ents)[si].addr = cpu_to_le64(sg_dma_address(sg));
			(*ents)[si].length = cpu_to_le32(sg_dma_len(sg));
			(*ents)[si].padding = 0;
		}
	} else {
		for_each_sgtable_sg(shmem->pages, sg, si) {
			(*ents)[si].addr = cpu_to_le64(sg_phys(sg));
			(*ents)[si].length = cpu_to_le32(sg->length);
			(*ents)[si].padding = 0;
		}
	}

	return 0;
}

int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
			     struct virtio_gpu_object_params *params,
			     struct virtio_gpu_object **bo_ptr,
			     struct virtio_gpu_fence *fence)
{
	struct virtio_gpu_object_array *objs = NULL;
	struct drm_gem_shmem_object *shmem_obj;
	struct virtio_gpu_object *bo;
	struct virtio_gpu_mem_entry *ents;
	unsigned int nents;
	int ret;

	*bo_ptr = NULL;

	params->size = roundup(params->size, PAGE_SIZE);
	shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
	if (IS_ERR(shmem_obj))
		return PTR_ERR(shmem_obj);
	bo = gem_to_virtio_gpu_obj(&shmem_obj->base);

	ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
	if (ret < 0)
		goto err_free_gem;

	bo->dumb = params->dumb;

	if (fence) {
		ret = -ENOMEM;
		objs = virtio_gpu_array_alloc(1);
		if (!objs)
			goto err_put_id;
		virtio_gpu_array_add_obj(objs, &bo->base.base);

		ret = virtio_gpu_array_lock_resv(objs);
		if (ret != 0)
			goto err_put_objs;
	}

	ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);
	if (ret != 0) {
		virtio_gpu_free_object(&shmem_obj->base);
		return ret;
	}

	if (params->blob) {
		virtio_gpu_cmd_resource_create_blob(vgdev, bo, params,
						    ents, nents);
	} else if (params->virgl) {
		virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
						  objs, fence);
		virtio_gpu_object_attach(vgdev, bo, ents, nents);
	} else {
		virtio_gpu_cmd_create_resource(vgdev, bo, params,
					       objs, fence);
		virtio_gpu_object_attach(vgdev, bo, ents, nents);
	}

	*bo_ptr = bo;
	return 0;

err_put_objs:
	virtio_gpu_array_put_free(objs);
err_put_id:
	virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
err_free_gem:
	drm_gem_shmem_free_object(&shmem_obj->base);
	return ret;
}