virtgpu_object.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 <linux/dma-mapping.h>
 27#include <linux/moduleparam.h>
 28
 29#include <drm/drm_print.h>
 30
 31#include "virtgpu_drv.h"
 32
 33static int virtio_gpu_virglrenderer_workaround = 1;
 34module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400);
 35
 36int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev, uint32_t *resid)
 37{
 38	if (virtio_gpu_virglrenderer_workaround) {
 39		/*
 40		 * Hack to avoid re-using resource IDs.
 41		 *
 42		 * virglrenderer versions up to (and including) 0.7.0
 43		 * can't deal with that.  virglrenderer commit
 44		 * "f91a9dd35715 Fix unlinking resources from hash
 45		 * table." (Feb 2019) fixes the bug.
 46		 */
 47		static atomic_t seqno = ATOMIC_INIT(0);
 48		int handle = atomic_inc_return(&seqno);
 49		*resid = handle + 1;
 50	} else {
 51		int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
 52
 53		if (handle < 0)
 54			return handle;
 55		*resid = handle + 1;
 56	}
 57	return 0;
 58}
 59
 60static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
 61{
 62	if (!virtio_gpu_virglrenderer_workaround)
 63		ida_free(&vgdev->resource_ida, id - 1);
 64}
 65
 66void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo)
 67{
 68	struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
 69
 70	virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
 71	if (virtio_gpu_is_shmem(bo)) {
 72		drm_gem_shmem_free(&bo->base);
 73	} else if (virtio_gpu_is_vram(bo)) {
 74		struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
 75
 76		spin_lock(&vgdev->host_visible_lock);
 77		if (drm_mm_node_allocated(&vram->vram_node))
 78			drm_mm_remove_node(&vram->vram_node);
 79
 80		spin_unlock(&vgdev->host_visible_lock);
 81
 82		drm_gem_free_mmap_offset(&vram->base.base.base);
 83		drm_gem_object_release(&vram->base.base.base);
 84		kfree(vram);
 85	} else {
 86		drm_gem_object_release(&bo->base.base);
 87		kfree(bo);
 88	}
 89}
 90
 91static void virtio_gpu_free_object(struct drm_gem_object *obj)
 92{
 93	struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
 94	struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
 95
 96	if (bo->created) {
 97		virtio_gpu_cmd_unref_resource(vgdev, bo);
 98		virtio_gpu_notify(vgdev);
 99		/* completion handler calls virtio_gpu_cleanup_object() */
100		return;
101	}
102	virtio_gpu_cleanup_object(bo);
103}
104
105int virtio_gpu_detach_object_fenced(struct virtio_gpu_object *bo)
106{
107	struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
108	struct virtio_gpu_fence *fence;
109
110	if (!bo->attached)
111		return 0;
112
113	fence = virtio_gpu_fence_alloc(vgdev, vgdev->fence_drv.context, 0);
114	if (!fence)
115		return -ENOMEM;
116
117	virtio_gpu_object_detach(vgdev, bo, fence);
118	virtio_gpu_notify(vgdev);
119
120	dma_fence_wait(&fence->f, false);
121	dma_fence_put(&fence->f);
122
123	return 0;
124}
125
126static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
127	.free = virtio_gpu_free_object,
128	.open = virtio_gpu_gem_object_open,
129	.close = virtio_gpu_gem_object_close,
130	.print_info = drm_gem_shmem_object_print_info,
131	.export = virtgpu_gem_prime_export,
132	.pin = drm_gem_shmem_object_pin,
133	.unpin = drm_gem_shmem_object_unpin,
134	.get_sg_table = drm_gem_shmem_object_get_sg_table,
135	.vmap = drm_gem_shmem_object_vmap,
136	.vunmap = drm_gem_shmem_object_vunmap,
137	.mmap = drm_gem_shmem_object_mmap,
138	.vm_ops = &drm_gem_shmem_vm_ops,
139};
140
141bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo)
142{
143	return bo->base.base.funcs == &virtio_gpu_shmem_funcs;
144}
145
146struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
147						size_t size)
148{
149	struct virtio_gpu_object_shmem *shmem;
150	struct drm_gem_shmem_object *dshmem;
151
152	shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);
153	if (!shmem)
154		return ERR_PTR(-ENOMEM);
155
156	dshmem = &shmem->base.base;
157	dshmem->base.funcs = &virtio_gpu_shmem_funcs;
158	return &dshmem->base;
159}
160
161static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
162					struct virtio_gpu_object *bo,
163					struct virtio_gpu_mem_entry **ents,
164					unsigned int *nents)
165{
166	bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
167	struct scatterlist *sg;
168	struct sg_table *pages;
169	int si;
170
171	pages = drm_gem_shmem_get_pages_sgt(&bo->base);
172	if (IS_ERR(pages))
173		return PTR_ERR(pages);
174
175	if (use_dma_api)
176		*nents = pages->nents;
177	else
178		*nents = pages->orig_nents;
179
180	*ents = kvmalloc_array(*nents,
181			       sizeof(struct virtio_gpu_mem_entry),
182			       GFP_KERNEL);
183	if (!(*ents)) {
184		DRM_ERROR("failed to allocate ent list\n");
185		return -ENOMEM;
186	}
187
188	if (use_dma_api) {
189		for_each_sgtable_dma_sg(pages, sg, si) {
190			(*ents)[si].addr = cpu_to_le64(sg_dma_address(sg));
191			(*ents)[si].length = cpu_to_le32(sg_dma_len(sg));
192			(*ents)[si].padding = 0;
193		}
194	} else {
195		for_each_sgtable_sg(pages, sg, si) {
196			(*ents)[si].addr = cpu_to_le64(sg_phys(sg));
197			(*ents)[si].length = cpu_to_le32(sg->length);
198			(*ents)[si].padding = 0;
199		}
200	}
201
202	return 0;
203}
204
205int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
206			     struct virtio_gpu_object_params *params,
207			     struct virtio_gpu_object **bo_ptr,
208			     struct virtio_gpu_fence *fence)
209{
210	struct virtio_gpu_object_array *objs = NULL;
211	struct drm_gem_shmem_object *shmem_obj;
212	struct virtio_gpu_object *bo;
213	struct virtio_gpu_mem_entry *ents = NULL;
214	unsigned int nents;
215	int ret;
216
217	*bo_ptr = NULL;
218
219	params->size = roundup(params->size, PAGE_SIZE);
220	shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
221	if (IS_ERR(shmem_obj))
222		return PTR_ERR(shmem_obj);
223	bo = gem_to_virtio_gpu_obj(&shmem_obj->base);
224
225	ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
226	if (ret < 0)
227		goto err_free_gem;
228
229	bo->dumb = params->dumb;
230
231	ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);
232	if (ret != 0)
233		goto err_put_id;
234
235	if (fence) {
236		ret = -ENOMEM;
237		objs = virtio_gpu_array_alloc(1);
238		if (!objs)
239			goto err_free_entry;
240		virtio_gpu_array_add_obj(objs, &bo->base.base);
241
242		ret = virtio_gpu_array_lock_resv(objs);
243		if (ret != 0)
244			goto err_put_objs;
245	}
246
247	if (params->blob) {
248		if (params->blob_mem == VIRTGPU_BLOB_MEM_GUEST)
249			bo->guest_blob = true;
250
251		virtio_gpu_cmd_resource_create_blob(vgdev, bo, params,
252						    ents, nents);
253	} else if (params->virgl) {
254		virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
255						  objs, fence);
256		virtio_gpu_object_attach(vgdev, bo, ents, nents);
257	} else {
258		virtio_gpu_cmd_create_resource(vgdev, bo, params,
259					       objs, fence);
260		virtio_gpu_object_attach(vgdev, bo, ents, nents);
261	}
262
263	*bo_ptr = bo;
264	return 0;
265
266err_put_objs:
267	virtio_gpu_array_put_free(objs);
268err_free_entry:
269	kvfree(ents);
270err_put_id:
271	virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
272err_free_gem:
273	drm_gem_shmem_free(shmem_obj);
274	return ret;
275}