[mirror_ubuntu-artful-kernel.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 <drm/virtgpu_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_fault *vmf)
{
	struct ttm_buffer_object *bo;
	struct virtio_gpu_device *vgdev;
	int r;

	bo = (struct ttm_buffer_object *)vmf->vma->vm_private_data;
	if (bo == NULL)
		return VM_FAULT_NOPAGE;
	vgdev = virtio_gpu_get_vgdev(bo->bdev);
	r = ttm_vm_ops->fault(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 = {
	.init = ttm_bo_man_init,
	.takedown = ttm_bo_man_takedown,
	.get_node = ttm_bo_man_get_node,
	.put_node = ttm_bo_man_put_node,
	.debug = 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)
{
	int ret;

	ret = ttm_bo_wait(bo, interruptible, no_wait_gpu);
	if (ret)
		return ret;

	virtio_gpu_move_null(bo, new_mem);
	return 0;
}

static void virtio_gpu_bo_move_notify(struct ttm_buffer_object *tbo,
				      bool evict,
				      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,
	.eviction_valuable = ttm_bo_eviction_valuable,
	.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,
	.io_mem_pfn = ttm_bo_default_io_mem_pfn,
	.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>
62fb7a5e	35	#include <drm/virtgpu_drm.h>
dc5698e8 DA	36	#include "virtgpu_drv.h"
	37
	38	#include <linux/delay.h>
	39
	40	#define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)
	41
	42	static struct
	43	virtio_gpu_device virtio_gpu_get_vgdev(struct ttm_bo_device bdev)
	44	{
	45	struct virtio_gpu_mman *mman;
	46	struct virtio_gpu_device *vgdev;
	47
	48	mman = container_of(bdev, struct virtio_gpu_mman, bdev);
	49	vgdev = container_of(mman, struct virtio_gpu_device, mman);
	50	return vgdev;
	51	}
	52
	53	static int virtio_gpu_ttm_mem_global_init(struct drm_global_reference *ref)
	54	{
	55	return ttm_mem_global_init(ref->object);
	56	}
	57
	58	static void virtio_gpu_ttm_mem_global_release(struct drm_global_reference *ref)
	59	{
	60	ttm_mem_global_release(ref->object);
	61	}
	62
	63	static int virtio_gpu_ttm_global_init(struct virtio_gpu_device *vgdev)
	64	{
	65	struct drm_global_reference *global_ref;
	66	int r;
	67
	68	vgdev->mman.mem_global_referenced = false;
	69	global_ref = &vgdev->mman.mem_global_ref;
	70	global_ref->global_type = DRM_GLOBAL_TTM_MEM;
	71	global_ref->size = sizeof(struct ttm_mem_global);
	72	global_ref->init = &virtio_gpu_ttm_mem_global_init;
	73	global_ref->release = &virtio_gpu_ttm_mem_global_release;
	74
	75	r = drm_global_item_ref(global_ref);
	76	if (r != 0) {
	77	DRM_ERROR("Failed setting up TTM memory accounting "
	78	"subsystem.\n");
	79	return r;
	80	}
	81
	82	vgdev->mman.bo_global_ref.mem_glob =
	83	vgdev->mman.mem_global_ref.object;
	84	global_ref = &vgdev->mman.bo_global_ref.ref;
	85	global_ref->global_type = DRM_GLOBAL_TTM_BO;
	86	global_ref->size = sizeof(struct ttm_bo_global);
	87	global_ref->init = &ttm_bo_global_init;
	88	global_ref->release = &ttm_bo_global_release;
	89	r = drm_global_item_ref(global_ref);
	90	if (r != 0) {
	91	DRM_ERROR("Failed setting up TTM BO subsystem.\n");
	92	drm_global_item_unref(&vgdev->mman.mem_global_ref);
	93	return r;
	94	}
	95
	96	vgdev->mman.mem_global_referenced = true;
	97	return 0;
	98	}
	99
100	static void virtio_gpu_ttm_global_fini(struct virtio_gpu_device *vgdev)
101	{
102	if (vgdev->mman.mem_global_referenced) {
103	drm_global_item_unref(&vgdev->mman.bo_global_ref.ref);
104	drm_global_item_unref(&vgdev->mman.mem_global_ref);
105	vgdev->mman.mem_global_referenced = false;
106	}
107	}
108
109	#if 0
110	/*
111	* Hmm, seems to not do anything useful. Leftover debug hack?
112	* Something like printing pagefaults to kernel log?
113	*/
114	static struct vm_operations_struct virtio_gpu_ttm_vm_ops;
115	static const struct vm_operations_struct *ttm_vm_ops;
116
11bac800	117	static int virtio_gpu_ttm_fault(struct vm_fault *vmf)
dc5698e8 DA	118	{
	119	struct ttm_buffer_object *bo;
	120	struct virtio_gpu_device *vgdev;
	121	int r;
	122
11bac800	123	bo = (struct ttm_buffer_object *)vmf->vma->vm_private_data;
dc5698e8 DA	124	if (bo == NULL)
	125	return VM_FAULT_NOPAGE;
	126	vgdev = virtio_gpu_get_vgdev(bo->bdev);
11bac800	127	r = ttm_vm_ops->fault(vmf);
dc5698e8 DA	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 = {
c92f7237 KC	200	.init = ttm_bo_man_init,
	201	.takedown = ttm_bo_man_takedown,
	202	.get_node = ttm_bo_man_get_node,
	203	.put_node = ttm_bo_man_put_node,
	204	.debug = ttm_bo_man_debug
dc5698e8 DA	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	{
88932a7b CK	377	int ret;
	378
	379	ret = ttm_bo_wait(bo, interruptible, no_wait_gpu);
	380	if (ret)
	381	return ret;
	382
dc5698e8 DA	383	virtio_gpu_move_null(bo, new_mem);
	384	return 0;
	385	}
	386
	387	static void virtio_gpu_bo_move_notify(struct ttm_buffer_object *tbo,
66257db7	388	bool evict,
dc5698e8 DA	389	struct ttm_mem_reg *new_mem)
	390	{
	391	struct virtio_gpu_object *bo;
	392	struct virtio_gpu_device *vgdev;
	393
	394	bo = container_of(tbo, struct virtio_gpu_object, tbo);
	395	vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
	396
	397	if (!new_mem \|\| (new_mem->placement & TTM_PL_FLAG_SYSTEM)) {
	398	if (bo->hw_res_handle)
	399	virtio_gpu_cmd_resource_inval_backing(vgdev,
	400	bo->hw_res_handle);
	401
	402	} else if (new_mem->placement & TTM_PL_FLAG_TT) {
	403	if (bo->hw_res_handle) {
	404	virtio_gpu_object_attach(vgdev, bo, bo->hw_res_handle,
	405	NULL);
	406	}
	407	}
	408	}
	409
	410	static void virtio_gpu_bo_swap_notify(struct ttm_buffer_object *tbo)
	411	{
	412	struct virtio_gpu_object *bo;
	413	struct virtio_gpu_device *vgdev;
	414
	415	bo = container_of(tbo, struct virtio_gpu_object, tbo);
	416	vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
	417
	418	if (bo->pages)
	419	virtio_gpu_object_free_sg_table(bo);
	420	}
	421
	422	static struct ttm_bo_driver virtio_gpu_bo_driver = {
	423	.ttm_tt_create = &virtio_gpu_ttm_tt_create,
	424	.ttm_tt_populate = &virtio_gpu_ttm_tt_populate,
	425	.ttm_tt_unpopulate = &virtio_gpu_ttm_tt_unpopulate,
	426	.invalidate_caches = &virtio_gpu_invalidate_caches,
	427	.init_mem_type = &virtio_gpu_init_mem_type,
a2ab19fe	428	.eviction_valuable = ttm_bo_eviction_valuable,
dc5698e8 DA	429	.evict_flags = &virtio_gpu_evict_flags,
	430	.move = &virtio_gpu_bo_move,
	431	.verify_access = &virtio_gpu_verify_access,
	432	.io_mem_reserve = &virtio_gpu_ttm_io_mem_reserve,
	433	.io_mem_free = &virtio_gpu_ttm_io_mem_free,
ea642c32	434	.io_mem_pfn = ttm_bo_default_io_mem_pfn,
dc5698e8 DA	435	.move_notify = &virtio_gpu_bo_move_notify,
	436	.swap_notify = &virtio_gpu_bo_swap_notify,
	437	};
	438
	439	int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev)
	440	{
	441	int r;
	442
	443	r = virtio_gpu_ttm_global_init(vgdev);
	444	if (r)
	445	return r;
	446	/* No others user of address space so set it to 0 */
	447	r = ttm_bo_device_init(&vgdev->mman.bdev,
	448	vgdev->mman.bo_global_ref.ref.object,
	449	&virtio_gpu_bo_driver,
	450	vgdev->ddev->anon_inode->i_mapping,
	451	DRM_FILE_PAGE_OFFSET, 0);
	452	if (r) {
	453	DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
	454	goto err_dev_init;
dc5698e8 DA	455	}
	456
	457	r = ttm_bo_init_mm(&vgdev->mman.bdev, TTM_PL_TT, 0);
	458	if (r) {
	459	DRM_ERROR("Failed initializing GTT heap.\n");
	460	goto err_mm_init;
dc5698e8 DA	461	}
	462	return 0;
	463
	464	err_mm_init:
	465	ttm_bo_device_release(&vgdev->mman.bdev);
	466	err_dev_init:
	467	virtio_gpu_ttm_global_fini(vgdev);
	468	return r;
	469	}
	470
	471	void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev)
	472	{
	473	ttm_bo_device_release(&vgdev->mman.bdev);
	474	virtio_gpu_ttm_global_fini(vgdev);
	475	DRM_INFO("virtio_gpu: ttm finalized\n");
	476	}