[deliverable/linux.git] / drivers / gpu / drm / virtio / virtgpu_ttm.c

/*
 * Copyright (C) 2015 Red Hat, Inc.
 * All Rights Reserved.
 *
 * Authors:
 *    Dave Airlie
 *    Alon Levy
 *
 * 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 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 HOLDER(S) OR AUTHOR(S) 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 <ttm/ttm_bo_api.h>
#include <ttm/ttm_bo_driver.h>
#include <ttm/ttm_placement.h>
#include <ttm/ttm_page_alloc.h>
#include <ttm/ttm_module.h>
#include <drm/drmP.h>
#include <drm/drm.h>
#include "virtgpu_drv.h"

#include <linux/delay.h>

#define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)

static struct
virtio_gpu_device *virtio_gpu_get_vgdev(struct ttm_bo_device *bdev)
{
	struct virtio_gpu_mman *mman;
	struct virtio_gpu_device *vgdev;

	mman = container_of(bdev, struct virtio_gpu_mman, bdev);
	vgdev = container_of(mman, struct virtio_gpu_device, mman);
	return vgdev;
}

static int virtio_gpu_ttm_mem_global_init(struct drm_global_reference *ref)
{
	return ttm_mem_global_init(ref->object);
}

static void virtio_gpu_ttm_mem_global_release(struct drm_global_reference *ref)
{
	ttm_mem_global_release(ref->object);
}

static int virtio_gpu_ttm_global_init(struct virtio_gpu_device *vgdev)
{
	struct drm_global_reference *global_ref;
	int r;

	vgdev->mman.mem_global_referenced = false;
	global_ref = &vgdev->mman.mem_global_ref;
	global_ref->global_type = DRM_GLOBAL_TTM_MEM;
	global_ref->size = sizeof(struct ttm_mem_global);
	global_ref->init = &virtio_gpu_ttm_mem_global_init;
	global_ref->release = &virtio_gpu_ttm_mem_global_release;

	r = drm_global_item_ref(global_ref);
	if (r != 0) {
		DRM_ERROR("Failed setting up TTM memory accounting "
			  "subsystem.\n");
		return r;
	}

	vgdev->mman.bo_global_ref.mem_glob =
		vgdev->mman.mem_global_ref.object;
	global_ref = &vgdev->mman.bo_global_ref.ref;
	global_ref->global_type = DRM_GLOBAL_TTM_BO;
	global_ref->size = sizeof(struct ttm_bo_global);
	global_ref->init = &ttm_bo_global_init;
	global_ref->release = &ttm_bo_global_release;
	r = drm_global_item_ref(global_ref);
	if (r != 0) {
		DRM_ERROR("Failed setting up TTM BO subsystem.\n");
		drm_global_item_unref(&vgdev->mman.mem_global_ref);
		return r;
	}

	vgdev->mman.mem_global_referenced = true;
	return 0;
}

static void virtio_gpu_ttm_global_fini(struct virtio_gpu_device *vgdev)
{
	if (vgdev->mman.mem_global_referenced) {
		drm_global_item_unref(&vgdev->mman.bo_global_ref.ref);
		drm_global_item_unref(&vgdev->mman.mem_global_ref);
		vgdev->mman.mem_global_referenced = false;
	}
}

#if 0
/*
 * Hmm, seems to not do anything useful.  Leftover debug hack?
 * Something like printing pagefaults to kernel log?
 */
static struct vm_operations_struct virtio_gpu_ttm_vm_ops;
static const struct vm_operations_struct *ttm_vm_ops;

static int virtio_gpu_ttm_fault(struct vm_area_struct *vma,
				struct vm_fault *vmf)
{
	struct ttm_buffer_object *bo;
	struct virtio_gpu_device *vgdev;
	int r;

	bo = (struct ttm_buffer_object *)vma->vm_private_data;
	if (bo == NULL)
		return VM_FAULT_NOPAGE;
	vgdev = virtio_gpu_get_vgdev(bo->bdev);
	r = ttm_vm_ops->fault(vma, vmf);
	return r;
}
#endif

int virtio_gpu_mmap(struct file *filp, struct vm_area_struct *vma)
{
	struct drm_file *file_priv;
	struct virtio_gpu_device *vgdev;
	int r;

	file_priv = filp->private_data;
	vgdev = file_priv->minor->dev->dev_private;
	if (vgdev == NULL) {
		DRM_ERROR(
		 "filp->private_data->minor->dev->dev_private == NULL\n");
		return -EINVAL;
	}
	r = ttm_bo_mmap(filp, vma, &vgdev->mman.bdev);
#if 0
	if (unlikely(r != 0))
		return r;
	if (unlikely(ttm_vm_ops == NULL)) {
		ttm_vm_ops = vma->vm_ops;
		virtio_gpu_ttm_vm_ops = *ttm_vm_ops;
		virtio_gpu_ttm_vm_ops.fault = &virtio_gpu_ttm_fault;
	}
	vma->vm_ops = &virtio_gpu_ttm_vm_ops;
	return 0;
#else
	return r;
#endif
}

static int virtio_gpu_invalidate_caches(struct ttm_bo_device *bdev,
					uint32_t flags)
{
	return 0;
}

static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
			       struct ttm_buffer_object *bo,
			       const struct ttm_place *place,
			       struct ttm_mem_reg *mem)
{
	mem->mm_node = (void *)1;
	return 0;
}

static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
				struct ttm_mem_reg *mem)
{
	mem->mm_node = (void *)NULL;
	return;
}

static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
			   unsigned long p_size)
{
	return 0;
}

static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
{
	return 0;
}

static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
			     const char *prefix)
{
}

static const struct ttm_mem_type_manager_func virtio_gpu_bo_manager_func = {
	ttm_bo_man_init,
	ttm_bo_man_takedown,
	ttm_bo_man_get_node,
	ttm_bo_man_put_node,
	ttm_bo_man_debug
};

static int virtio_gpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
				    struct ttm_mem_type_manager *man)
{
	struct virtio_gpu_device *vgdev;

	vgdev = virtio_gpu_get_vgdev(bdev);

	switch (type) {
	case TTM_PL_SYSTEM:
		/* System memory */
		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
		man->available_caching = TTM_PL_MASK_CACHING;
		man->default_caching = TTM_PL_FLAG_CACHED;
		break;
	case TTM_PL_TT:
		man->func = &virtio_gpu_bo_manager_func;
		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
		man->available_caching = TTM_PL_MASK_CACHING;
		man->default_caching = TTM_PL_FLAG_CACHED;
		break;
	default:
		DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
		return -EINVAL;
	}
	return 0;
}

static void virtio_gpu_evict_flags(struct ttm_buffer_object *bo,
				struct ttm_placement *placement)
{
	static struct ttm_place placements = {
		.fpfn  = 0,
		.lpfn  = 0,
		.flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM,
	};

	placement->placement = &placements;
	placement->busy_placement = &placements;
	placement->num_placement = 1;
	placement->num_busy_placement = 1;
	return;
}

static int virtio_gpu_verify_access(struct ttm_buffer_object *bo,
				    struct file *filp)
{
	return 0;
}

static int virtio_gpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
					 struct ttm_mem_reg *mem)
{
	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];

	mem->bus.addr = NULL;
	mem->bus.offset = 0;
	mem->bus.size = mem->num_pages << PAGE_SHIFT;
	mem->bus.base = 0;
	mem->bus.is_iomem = false;
	if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
		return -EINVAL;
	switch (mem->mem_type) {
	case TTM_PL_SYSTEM:
	case TTM_PL_TT:
		/* system memory */
		return 0;
	default:
		return -EINVAL;
	}
	return 0;
}

static void virtio_gpu_ttm_io_mem_free(struct ttm_bo_device *bdev,
				       struct ttm_mem_reg *mem)
{
}

/*
 * TTM backend functions.
 */
struct virtio_gpu_ttm_tt {
	struct ttm_dma_tt		ttm;
	struct virtio_gpu_device	*vgdev;
	u64				offset;
};

static int virtio_gpu_ttm_backend_bind(struct ttm_tt *ttm,
				       struct ttm_mem_reg *bo_mem)
{
	struct virtio_gpu_ttm_tt *gtt = (void *)ttm;

	gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT);
	if (!ttm->num_pages)
		WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
		     ttm->num_pages, bo_mem, ttm);

	/* Not implemented */
	return 0;
}

static int virtio_gpu_ttm_backend_unbind(struct ttm_tt *ttm)
{
	/* Not implemented */
	return 0;
}

static void virtio_gpu_ttm_backend_destroy(struct ttm_tt *ttm)
{
	struct virtio_gpu_ttm_tt *gtt = (void *)ttm;

	ttm_dma_tt_fini(&gtt->ttm);
	kfree(gtt);
}

static struct ttm_backend_func virtio_gpu_backend_func = {
	.bind = &virtio_gpu_ttm_backend_bind,
	.unbind = &virtio_gpu_ttm_backend_unbind,
	.destroy = &virtio_gpu_ttm_backend_destroy,
};

static int virtio_gpu_ttm_tt_populate(struct ttm_tt *ttm)
{
	if (ttm->state != tt_unpopulated)
		return 0;

	return ttm_pool_populate(ttm);
}

static void virtio_gpu_ttm_tt_unpopulate(struct ttm_tt *ttm)
{
	ttm_pool_unpopulate(ttm);
}

static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_bo_device *bdev,
					       unsigned long size,
					       uint32_t page_flags,
					       struct page *dummy_read_page)
{
	struct virtio_gpu_device *vgdev;
	struct virtio_gpu_ttm_tt *gtt;

	vgdev = virtio_gpu_get_vgdev(bdev);
	gtt = kzalloc(sizeof(struct virtio_gpu_ttm_tt), GFP_KERNEL);
	if (gtt == NULL)
		return NULL;
	gtt->ttm.ttm.func = &virtio_gpu_backend_func;
	gtt->vgdev = vgdev;
	if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags,
			    dummy_read_page)) {
		kfree(gtt);
		return NULL;
	}
	return &gtt->ttm.ttm;
}

static void virtio_gpu_move_null(struct ttm_buffer_object *bo,
				 struct ttm_mem_reg *new_mem)
{
	struct ttm_mem_reg *old_mem = &bo->mem;

	BUG_ON(old_mem->mm_node != NULL);
	*old_mem = *new_mem;
	new_mem->mm_node = NULL;
}

static int virtio_gpu_bo_move(struct ttm_buffer_object *bo,
			      bool evict, bool interruptible,
			      bool no_wait_gpu,
			      struct ttm_mem_reg *new_mem)
{
	virtio_gpu_move_null(bo, new_mem);
	return 0;
}

static void virtio_gpu_bo_move_notify(struct ttm_buffer_object *tbo,
				      struct ttm_mem_reg *new_mem)
{
	struct virtio_gpu_object *bo;
	struct virtio_gpu_device *vgdev;

	bo = container_of(tbo, struct virtio_gpu_object, tbo);
	vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;

	if (!new_mem || (new_mem->placement & TTM_PL_FLAG_SYSTEM)) {
		if (bo->hw_res_handle)
			virtio_gpu_cmd_resource_inval_backing(vgdev,
							   bo->hw_res_handle);

	} else if (new_mem->placement & TTM_PL_FLAG_TT) {
		if (bo->hw_res_handle) {
			virtio_gpu_object_attach(vgdev, bo, bo->hw_res_handle,
						 NULL);
		}
	}
}

static void virtio_gpu_bo_swap_notify(struct ttm_buffer_object *tbo)
{
	struct virtio_gpu_object *bo;
	struct virtio_gpu_device *vgdev;

	bo = container_of(tbo, struct virtio_gpu_object, tbo);
	vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;

	if (bo->pages)
		virtio_gpu_object_free_sg_table(bo);
}

static struct ttm_bo_driver virtio_gpu_bo_driver = {
	.ttm_tt_create = &virtio_gpu_ttm_tt_create,
	.ttm_tt_populate = &virtio_gpu_ttm_tt_populate,
	.ttm_tt_unpopulate = &virtio_gpu_ttm_tt_unpopulate,
	.invalidate_caches = &virtio_gpu_invalidate_caches,
	.init_mem_type = &virtio_gpu_init_mem_type,
	.evict_flags = &virtio_gpu_evict_flags,
	.move = &virtio_gpu_bo_move,
	.verify_access = &virtio_gpu_verify_access,
	.io_mem_reserve = &virtio_gpu_ttm_io_mem_reserve,
	.io_mem_free = &virtio_gpu_ttm_io_mem_free,
	.move_notify = &virtio_gpu_bo_move_notify,
	.swap_notify = &virtio_gpu_bo_swap_notify,
};

int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev)
{
	int r;

	r = virtio_gpu_ttm_global_init(vgdev);
	if (r)
		return r;
	/* No others user of address space so set it to 0 */
	r = ttm_bo_device_init(&vgdev->mman.bdev,
			       vgdev->mman.bo_global_ref.ref.object,
			       &virtio_gpu_bo_driver,
			       vgdev->ddev->anon_inode->i_mapping,
			       DRM_FILE_PAGE_OFFSET, 0);
	if (r) {
		DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
		goto err_dev_init;
	}

	r = ttm_bo_init_mm(&vgdev->mman.bdev, TTM_PL_TT, 0);
	if (r) {
		DRM_ERROR("Failed initializing GTT heap.\n");
		goto err_mm_init;
	}
	return 0;

err_mm_init:
	ttm_bo_device_release(&vgdev->mman.bdev);
err_dev_init:
	virtio_gpu_ttm_global_fini(vgdev);
	return r;
}

void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev)
{
	ttm_bo_device_release(&vgdev->mman.bdev);
	virtio_gpu_ttm_global_fini(vgdev);
	DRM_INFO("virtio_gpu: ttm finalized\n");
}
Commit	Line	Data
dc5698e8 DA	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 <ttm/ttm_bo_api.h>
	29	#include <ttm/ttm_bo_driver.h>
	30	#include <ttm/ttm_placement.h>
	31	#include <ttm/ttm_page_alloc.h>
	32	#include <ttm/ttm_module.h>
	33	#include <drm/drmP.h>
	34	#include <drm/drm.h>
	35	#include "virtgpu_drv.h"
	36
	37	#include <linux/delay.h>
	38
	39	#define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)
	40
	41	static struct
	42	virtio_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
	52	static int virtio_gpu_ttm_mem_global_init(struct drm_global_reference *ref)
	53	{
	54	return ttm_mem_global_init(ref->object);
	55	}
	56
	57	static void virtio_gpu_ttm_mem_global_release(struct drm_global_reference *ref)
	58	{
	59	ttm_mem_global_release(ref->object);
	60	}
	61
	62	static int virtio_gpu_ttm_global_init(struct virtio_gpu_device *vgdev)
	63	{
	64	struct drm_global_reference *global_ref;
65	int r;
66
67	vgdev->mman.mem_global_referenced = false;
68	global_ref = &vgdev->mman.mem_global_ref;
69	global_ref->global_type = DRM_GLOBAL_TTM_MEM;
70	global_ref->size = sizeof(struct ttm_mem_global);
71	global_ref->init = &virtio_gpu_ttm_mem_global_init;
72	global_ref->release = &virtio_gpu_ttm_mem_global_release;
73
74	r = drm_global_item_ref(global_ref);
75	if (r != 0) {
76	DRM_ERROR("Failed setting up TTM memory accounting "
77	"subsystem.\n");
78	return r;
79	}
80
81	vgdev->mman.bo_global_ref.mem_glob =
82	vgdev->mman.mem_global_ref.object;
83	global_ref = &vgdev->mman.bo_global_ref.ref;
84	global_ref->global_type = DRM_GLOBAL_TTM_BO;
85	global_ref->size = sizeof(struct ttm_bo_global);
86	global_ref->init = &ttm_bo_global_init;
87	global_ref->release = &ttm_bo_global_release;
88	r = drm_global_item_ref(global_ref);
89	if (r != 0) {
90	DRM_ERROR("Failed setting up TTM BO subsystem.\n");
91	drm_global_item_unref(&vgdev->mman.mem_global_ref);
92	return r;
93	}
94
95	vgdev->mman.mem_global_referenced = true;
96	return 0;
97	}
98
99	static void virtio_gpu_ttm_global_fini(struct virtio_gpu_device *vgdev)
100	{
101	if (vgdev->mman.mem_global_referenced) {
102	drm_global_item_unref(&vgdev->mman.bo_global_ref.ref);
103	drm_global_item_unref(&vgdev->mman.mem_global_ref);
104	vgdev->mman.mem_global_referenced = false;
105	}
106	}
107
108	#if 0
109	/*
110	* Hmm, seems to not do anything useful. Leftover debug hack?
111	* Something like printing pagefaults to kernel log?
112	*/
113	static struct vm_operations_struct virtio_gpu_ttm_vm_ops;
114	static const struct vm_operations_struct *ttm_vm_ops;
115
116	static int virtio_gpu_ttm_fault(struct vm_area_struct *vma,
117	struct vm_fault *vmf)
118	{
119	struct ttm_buffer_object *bo;
120	struct virtio_gpu_device *vgdev;
121	int r;
122
123	bo = (struct ttm_buffer_object *)vma->vm_private_data;
124	if (bo == NULL)
125	return VM_FAULT_NOPAGE;
126	vgdev = virtio_gpu_get_vgdev(bo->bdev);
127	r = ttm_vm_ops->fault(vma, vmf);
128	return r;
129	}
130	#endif
131
132	int virtio_gpu_mmap(struct file filp, struct vm_area_struct vma)
133	{
134	struct drm_file *file_priv;
135	struct virtio_gpu_device *vgdev;
136	int r;
137
138	file_priv = filp->private_data;
139	vgdev = file_priv->minor->dev->dev_private;
140	if (vgdev == NULL) {
141	DRM_ERROR(
142	"filp->private_data->minor->dev->dev_private == NULL\n");
143	return -EINVAL;
144	}
145	r = ttm_bo_mmap(filp, vma, &vgdev->mman.bdev);
146	#if 0
147	if (unlikely(r != 0))
148	return r;
149	if (unlikely(ttm_vm_ops == NULL)) {
150	ttm_vm_ops = vma->vm_ops;
151	virtio_gpu_ttm_vm_ops = *ttm_vm_ops;
152	virtio_gpu_ttm_vm_ops.fault = &virtio_gpu_ttm_fault;
153	}
154	vma->vm_ops = &virtio_gpu_ttm_vm_ops;
155	return 0;
156	#else
157	return r;
158	#endif
159	}
160
161	static int virtio_gpu_invalidate_caches(struct ttm_bo_device *bdev,
162	uint32_t flags)
163	{
164	return 0;
165	}
166
167	static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
168	struct ttm_buffer_object *bo,
169	const struct ttm_place *place,
170	struct ttm_mem_reg *mem)
171	{
172	mem->mm_node = (void *)1;
173	return 0;
174	}
175
176	static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
177	struct ttm_mem_reg *mem)
178	{
179	mem->mm_node = (void *)NULL;
180	return;
181	}
182
183	static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
184	unsigned long p_size)
185	{
186	return 0;
187	}
188
189	static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
190	{
191	return 0;
192	}
193
194	static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
195	const char *prefix)
196	{
197	}
198
199	static const struct ttm_mem_type_manager_func virtio_gpu_bo_manager_func = {
200	ttm_bo_man_init,
201	ttm_bo_man_takedown,
202	ttm_bo_man_get_node,
203	ttm_bo_man_put_node,
204	ttm_bo_man_debug
205	};
206
207	static int virtio_gpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
208	struct ttm_mem_type_manager *man)
209	{
210	struct virtio_gpu_device *vgdev;
211
212	vgdev = virtio_gpu_get_vgdev(bdev);
213
214	switch (type) {
215	case TTM_PL_SYSTEM:
216	/* System memory */
217	man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
218	man->available_caching = TTM_PL_MASK_CACHING;
219	man->default_caching = TTM_PL_FLAG_CACHED;
220	break;
221	case TTM_PL_TT:
222	man->func = &virtio_gpu_bo_manager_func;
223	man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
224	man->available_caching = TTM_PL_MASK_CACHING;
225	man->default_caching = TTM_PL_FLAG_CACHED;
226	break;
227	default:
228	DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
229	return -EINVAL;
230	}
231	return 0;
232	}
233
234	static void virtio_gpu_evict_flags(struct ttm_buffer_object *bo,
235	struct ttm_placement *placement)
236	{
237	static struct ttm_place placements = {
238	.fpfn = 0,
239	.lpfn = 0,
240	.flags = TTM_PL_MASK_CACHING \| TTM_PL_FLAG_SYSTEM,
241	};
242
243	placement->placement = &placements;
244	placement->busy_placement = &placements;
245	placement->num_placement = 1;
246	placement->num_busy_placement = 1;
247	return;
248	}
249
250	static int virtio_gpu_verify_access(struct ttm_buffer_object *bo,
251	struct file *filp)
252	{
253	return 0;
254	}
255
256	static int virtio_gpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
257	struct ttm_mem_reg *mem)
258	{
259	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
260
261	mem->bus.addr = NULL;
262	mem->bus.offset = 0;
263	mem->bus.size = mem->num_pages << PAGE_SHIFT;
264	mem->bus.base = 0;
265	mem->bus.is_iomem = false;
266	if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
267	return -EINVAL;
268	switch (mem->mem_type) {
269	case TTM_PL_SYSTEM:
270	case TTM_PL_TT:
271	/* system memory */
272	return 0;
273	default:
274	return -EINVAL;
275	}
276	return 0;
277	}
278
279	static void virtio_gpu_ttm_io_mem_free(struct ttm_bo_device *bdev,
280	struct ttm_mem_reg *mem)
281	{
282	}
283
284	/*
285	* TTM backend functions.
286	*/
287	struct virtio_gpu_ttm_tt {
288	struct ttm_dma_tt ttm;
289	struct virtio_gpu_device *vgdev;
290	u64 offset;
291	};
292
293	static int virtio_gpu_ttm_backend_bind(struct ttm_tt *ttm,
294	struct ttm_mem_reg *bo_mem)
295	{
296	struct virtio_gpu_ttm_tt gtt = (void )ttm;
297
298	gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT);
299	if (!ttm->num_pages)
300	WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
301	ttm->num_pages, bo_mem, ttm);
302
303	/* Not implemented */
304	return 0;
305	}
306
307	static int virtio_gpu_ttm_backend_unbind(struct ttm_tt *ttm)
308	{
309	/* Not implemented */
310	return 0;
311	}
312
313	static void virtio_gpu_ttm_backend_destroy(struct ttm_tt *ttm)
314	{
315	struct virtio_gpu_ttm_tt gtt = (void )ttm;
316
317	ttm_dma_tt_fini(&gtt->ttm);
318	kfree(gtt);
319	}
320
321	static struct ttm_backend_func virtio_gpu_backend_func = {
322	.bind = &virtio_gpu_ttm_backend_bind,
323	.unbind = &virtio_gpu_ttm_backend_unbind,
324	.destroy = &virtio_gpu_ttm_backend_destroy,
325	};
326
327	static int virtio_gpu_ttm_tt_populate(struct ttm_tt *ttm)
328	{
329	if (ttm->state != tt_unpopulated)
330	return 0;
331
332	return ttm_pool_populate(ttm);
333	}
334
335	static void virtio_gpu_ttm_tt_unpopulate(struct ttm_tt *ttm)
336	{
337	ttm_pool_unpopulate(ttm);
338	}
339
340	static struct ttm_tt virtio_gpu_ttm_tt_create(struct ttm_bo_device bdev,
341	unsigned long size,
342	uint32_t page_flags,
343	struct page *dummy_read_page)
344	{
345	struct virtio_gpu_device *vgdev;
346	struct virtio_gpu_ttm_tt *gtt;
347
348	vgdev = virtio_gpu_get_vgdev(bdev);
349	gtt = kzalloc(sizeof(struct virtio_gpu_ttm_tt), GFP_KERNEL);
350	if (gtt == NULL)
351	return NULL;
352	gtt->ttm.ttm.func = &virtio_gpu_backend_func;
353	gtt->vgdev = vgdev;
354	if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags,
355	dummy_read_page)) {
356	kfree(gtt);
357	return NULL;
358	}
359	return &gtt->ttm.ttm;
360	}
361
362	static void virtio_gpu_move_null(struct ttm_buffer_object *bo,
363	struct ttm_mem_reg *new_mem)
364	{
365	struct ttm_mem_reg *old_mem = &bo->mem;
366
367	BUG_ON(old_mem->mm_node != NULL);
368	old_mem = new_mem;
369	new_mem->mm_node = NULL;
370	}
371
372	static int virtio_gpu_bo_move(struct ttm_buffer_object *bo,
373	bool evict, bool interruptible,
374	bool no_wait_gpu,
375	struct ttm_mem_reg *new_mem)
376	{
377	virtio_gpu_move_null(bo, new_mem);
378	return 0;
379	}
380
381	static void virtio_gpu_bo_move_notify(struct ttm_buffer_object *tbo,
382	struct ttm_mem_reg *new_mem)
383	{
384	struct virtio_gpu_object *bo;
385	struct virtio_gpu_device *vgdev;
386
387	bo = container_of(tbo, struct virtio_gpu_object, tbo);
388	vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
389
390	if (!new_mem \|\| (new_mem->placement & TTM_PL_FLAG_SYSTEM)) {
391	if (bo->hw_res_handle)
392	virtio_gpu_cmd_resource_inval_backing(vgdev,
393	bo->hw_res_handle);
394
395	} else if (new_mem->placement & TTM_PL_FLAG_TT) {
396	if (bo->hw_res_handle) {
397	virtio_gpu_object_attach(vgdev, bo, bo->hw_res_handle,
398	NULL);
399	}
400	}
401	}
402
403	static void virtio_gpu_bo_swap_notify(struct ttm_buffer_object *tbo)
404	{
405	struct virtio_gpu_object *bo;
406	struct virtio_gpu_device *vgdev;
407
408	bo = container_of(tbo, struct virtio_gpu_object, tbo);
409	vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
410
411	if (bo->pages)
412	virtio_gpu_object_free_sg_table(bo);
413	}
414
415	static struct ttm_bo_driver virtio_gpu_bo_driver = {
416	.ttm_tt_create = &virtio_gpu_ttm_tt_create,
417	.ttm_tt_populate = &virtio_gpu_ttm_tt_populate,
418	.ttm_tt_unpopulate = &virtio_gpu_ttm_tt_unpopulate,
419	.invalidate_caches = &virtio_gpu_invalidate_caches,
420	.init_mem_type = &virtio_gpu_init_mem_type,
421	.evict_flags = &virtio_gpu_evict_flags,
422	.move = &virtio_gpu_bo_move,
423	.verify_access = &virtio_gpu_verify_access,
424	.io_mem_reserve = &virtio_gpu_ttm_io_mem_reserve,
425	.io_mem_free = &virtio_gpu_ttm_io_mem_free,
426	.move_notify = &virtio_gpu_bo_move_notify,
427	.swap_notify = &virtio_gpu_bo_swap_notify,
428	};
429
430	int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev)
431	{
432	int r;
433
434	r = virtio_gpu_ttm_global_init(vgdev);
435	if (r)
436	return r;
437	/* No others user of address space so set it to 0 */
438	r = ttm_bo_device_init(&vgdev->mman.bdev,
439	vgdev->mman.bo_global_ref.ref.object,
440	&virtio_gpu_bo_driver,
441	vgdev->ddev->anon_inode->i_mapping,
442	DRM_FILE_PAGE_OFFSET, 0);
443	if (r) {
444	DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
445	goto err_dev_init;
dc5698e8 DA	446	}
	447
	448	r = ttm_bo_init_mm(&vgdev->mman.bdev, TTM_PL_TT, 0);
	449	if (r) {
	450	DRM_ERROR("Failed initializing GTT heap.\n");
	451	goto err_mm_init;
dc5698e8 DA	452	}
	453	return 0;
	454
	455	err_mm_init:
	456	ttm_bo_device_release(&vgdev->mman.bdev);
	457	err_dev_init:
	458	virtio_gpu_ttm_global_fini(vgdev);
	459	return r;
	460	}
	461
	462	void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev)
	463	{
	464	ttm_bo_device_release(&vgdev->mman.bdev);
	465	virtio_gpu_ttm_global_fini(vgdev);
	466	DRM_INFO("virtio_gpu: ttm finalized\n");
	467	}