1/*
  2 * Copyright (C) 2015 Red Hat, Inc.
  3 * All Rights Reserved.
  4 *
  5 * Authors:
  6 *    Dave Airlie
  7 *    Alon Levy
  8 *
  9 * Permission is hereby granted, free of charge, to any person obtaining a
 10 * copy of this software and associated documentation files (the "Software"),
 11 * to deal in the Software without restriction, including without limitation
 12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 13 * and/or sell copies of the Software, and to permit persons to whom the
 14 * Software is furnished to do so, subject to the following conditions:
 15 *
 16 * The above copyright notice and this permission notice shall be included in
 17 * all copies or substantial portions of the Software.
 18 *
 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 22 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 25 * OTHER DEALINGS IN THE SOFTWARE.
 26 */
 27
 28#include <linux/delay.h>
 29
 30#include <drm/drm.h>
 31#include <drm/drm_file.h>
 32#include <drm/ttm/ttm_bo_api.h>
 33#include <drm/ttm/ttm_bo_driver.h>
 34#include <drm/ttm/ttm_module.h>
 35#include <drm/ttm/ttm_page_alloc.h>
 36#include <drm/ttm/ttm_placement.h>
 37#include <drm/virtgpu_drm.h>
 38
 39#include "virtgpu_drv.h"
 40
 41static struct
 42virtio_gpu_device *virtio_gpu_get_vgdev(struct ttm_bo_device *bdev)
 43{
 44	struct virtio_gpu_mman *mman;
 45	struct virtio_gpu_device *vgdev;
 46
 47	mman = container_of(bdev, struct virtio_gpu_mman, bdev);
 48	vgdev = container_of(mman, struct virtio_gpu_device, mman);
 49	return vgdev;
 50}
 51
 52int virtio_gpu_mmap(struct file *filp, struct vm_area_struct *vma)
 53{
 54	struct drm_file *file_priv;
 55	struct virtio_gpu_device *vgdev;
 56	int r;
 57
 58	file_priv = filp->private_data;
 59	vgdev = file_priv->minor->dev->dev_private;
 60	if (vgdev == NULL) {
 61		DRM_ERROR(
 62		 "filp->private_data->minor->dev->dev_private == NULL\n");
 63		return -EINVAL;
 64	}
 65	r = ttm_bo_mmap(filp, vma, &vgdev->mman.bdev);
 66
 67	return r;
 68}
 69
 70static int virtio_gpu_invalidate_caches(struct ttm_bo_device *bdev,
 71					uint32_t flags)
 72{
 73	return 0;
 74}
 75
 76static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
 77			       struct ttm_buffer_object *bo,
 78			       const struct ttm_place *place,
 79			       struct ttm_mem_reg *mem)
 80{
 81	mem->mm_node = (void *)1;
 82	return 0;
 83}
 84
 85static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
 86				struct ttm_mem_reg *mem)
 87{
 88	mem->mm_node = (void *)NULL;
 89}
 90
 91static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
 92			   unsigned long p_size)
 93{
 94	return 0;
 95}
 96
 97static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
 98{
 99	return 0;
100}
101
102static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
103			     struct drm_printer *printer)
104{
105}
106
107static const struct ttm_mem_type_manager_func virtio_gpu_bo_manager_func = {
108	.init = ttm_bo_man_init,
109	.takedown = ttm_bo_man_takedown,
110	.get_node = ttm_bo_man_get_node,
111	.put_node = ttm_bo_man_put_node,
112	.debug = ttm_bo_man_debug
113};
114
115static int virtio_gpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
116				    struct ttm_mem_type_manager *man)
117{
118	switch (type) {
119	case TTM_PL_SYSTEM:
120		/* System memory */
121		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
122		man->available_caching = TTM_PL_MASK_CACHING;
123		man->default_caching = TTM_PL_FLAG_CACHED;
124		break;
125	case TTM_PL_TT:
126		man->func = &virtio_gpu_bo_manager_func;
127		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
128		man->available_caching = TTM_PL_MASK_CACHING;
129		man->default_caching = TTM_PL_FLAG_CACHED;
130		break;
131	default:
132		DRM_ERROR("Unsupported memory type %u\n", (unsigned int)type);
133		return -EINVAL;
134	}
135	return 0;
136}
137
138static void virtio_gpu_evict_flags(struct ttm_buffer_object *bo,
139				struct ttm_placement *placement)
140{
141	static const struct ttm_place placements = {
142		.fpfn  = 0,
143		.lpfn  = 0,
144		.flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM,
145	};
146
147	placement->placement = &placements;
148	placement->busy_placement = &placements;
149	placement->num_placement = 1;
150	placement->num_busy_placement = 1;
151}
152
153static int virtio_gpu_verify_access(struct ttm_buffer_object *bo,
154				    struct file *filp)
155{
156	return 0;
157}
158
159static int virtio_gpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
160					 struct ttm_mem_reg *mem)
161{
162	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
163
164	mem->bus.addr = NULL;
165	mem->bus.offset = 0;
166	mem->bus.size = mem->num_pages << PAGE_SHIFT;
167	mem->bus.base = 0;
168	mem->bus.is_iomem = false;
169	if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
170		return -EINVAL;
171	switch (mem->mem_type) {
172	case TTM_PL_SYSTEM:
173	case TTM_PL_TT:
174		/* system memory */
175		return 0;
176	default:
177		return -EINVAL;
178	}
179	return 0;
180}
181
182static void virtio_gpu_ttm_io_mem_free(struct ttm_bo_device *bdev,
183				       struct ttm_mem_reg *mem)
184{
185}
186
187/*
188 * TTM backend functions.
189 */
190struct virtio_gpu_ttm_tt {
191	struct ttm_dma_tt		ttm;
192	struct virtio_gpu_object        *obj;
193};
194
195static int virtio_gpu_ttm_tt_bind(struct ttm_tt *ttm,
196				  struct ttm_mem_reg *bo_mem)
197{
198	struct virtio_gpu_ttm_tt *gtt =
199		container_of(ttm, struct virtio_gpu_ttm_tt, ttm.ttm);
200	struct virtio_gpu_device *vgdev =
201		virtio_gpu_get_vgdev(gtt->obj->tbo.bdev);
202
203	virtio_gpu_object_attach(vgdev, gtt->obj, NULL);
204	return 0;
205}
206
207static int virtio_gpu_ttm_tt_unbind(struct ttm_tt *ttm)
208{
209	struct virtio_gpu_ttm_tt *gtt =
210		container_of(ttm, struct virtio_gpu_ttm_tt, ttm.ttm);
211	struct virtio_gpu_device *vgdev =
212		virtio_gpu_get_vgdev(gtt->obj->tbo.bdev);
213
214	virtio_gpu_object_detach(vgdev, gtt->obj);
215	return 0;
216}
217
218static void virtio_gpu_ttm_tt_destroy(struct ttm_tt *ttm)
219{
220	struct virtio_gpu_ttm_tt *gtt =
221		container_of(ttm, struct virtio_gpu_ttm_tt, ttm.ttm);
222
223	ttm_dma_tt_fini(&gtt->ttm);
224	kfree(gtt);
225}
226
227static struct ttm_backend_func virtio_gpu_tt_func = {
228	.bind = &virtio_gpu_ttm_tt_bind,
229	.unbind = &virtio_gpu_ttm_tt_unbind,
230	.destroy = &virtio_gpu_ttm_tt_destroy,
231};
232
233static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_buffer_object *bo,
234					       uint32_t page_flags)
235{
236	struct virtio_gpu_device *vgdev;
237	struct virtio_gpu_ttm_tt *gtt;
238
239	vgdev = virtio_gpu_get_vgdev(bo->bdev);
240	gtt = kzalloc(sizeof(struct virtio_gpu_ttm_tt), GFP_KERNEL);
241	if (gtt == NULL)
242		return NULL;
243	gtt->ttm.ttm.func = &virtio_gpu_tt_func;
244	gtt->obj = container_of(bo, struct virtio_gpu_object, tbo);
245	if (ttm_dma_tt_init(&gtt->ttm, bo, page_flags)) {
246		kfree(gtt);
247		return NULL;
248	}
249	return &gtt->ttm.ttm;
250}
251
252static void virtio_gpu_bo_swap_notify(struct ttm_buffer_object *tbo)
253{
254	struct virtio_gpu_object *bo;
255
256	bo = container_of(tbo, struct virtio_gpu_object, tbo);
257
258	if (bo->pages)
259		virtio_gpu_object_free_sg_table(bo);
260}
261
262static struct ttm_bo_driver virtio_gpu_bo_driver = {
263	.ttm_tt_create = &virtio_gpu_ttm_tt_create,
264	.invalidate_caches = &virtio_gpu_invalidate_caches,
265	.init_mem_type = &virtio_gpu_init_mem_type,
266	.eviction_valuable = ttm_bo_eviction_valuable,
267	.evict_flags = &virtio_gpu_evict_flags,
268	.verify_access = &virtio_gpu_verify_access,
269	.io_mem_reserve = &virtio_gpu_ttm_io_mem_reserve,
270	.io_mem_free = &virtio_gpu_ttm_io_mem_free,
271	.swap_notify = &virtio_gpu_bo_swap_notify,
272};
273
274int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev)
275{
276	int r;
277
278	/* No others user of address space so set it to 0 */
279	r = ttm_bo_device_init(&vgdev->mman.bdev,
280			       &virtio_gpu_bo_driver,
281			       vgdev->ddev->anon_inode->i_mapping,
282			       false);
283	if (r) {
284		DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
285		goto err_dev_init;
286	}
287
288	r = ttm_bo_init_mm(&vgdev->mman.bdev, TTM_PL_TT, 0);
289	if (r) {
290		DRM_ERROR("Failed initializing GTT heap.\n");
291		goto err_mm_init;
292	}
293	return 0;
294
295err_mm_init:
296	ttm_bo_device_release(&vgdev->mman.bdev);
297err_dev_init:
298	return r;
299}
300
301void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev)
302{
303	ttm_bo_device_release(&vgdev->mman.bdev);
304	DRM_INFO("virtio_gpu: ttm finalized\n");
305}