path: root/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c

// SPDX-License-Identifier: GPL-2.0 OR MIT
/**************************************************************************
 *
 * Copyright (c) 2009-2024 Broadcom. All Rights Reserved. The term
 * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.
 *
 * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS 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.
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 **************************************************************************/

#include <drm/ttm/ttm_placement.h>

#include "vmwgfx_binding.h"
#include "vmwgfx_bo.h"
#include "vmwgfx_drv.h"
#include "vmwgfx_resource_priv.h"

#define VMW_RES_EVICT_ERR_COUNT 10

/**
 * vmw_resource_mob_attach - Mark a resource as attached to its backing mob
 * @res: The resource
 */
void vmw_resource_mob_attach(struct vmw_resource *res)
{
	struct vmw_bo *gbo = res->guest_memory_bo;
	struct rb_node **new = &gbo->res_tree.rb_node, *parent = NULL;

	dma_resv_assert_held(gbo->tbo.base.resv);
	res->used_prio = (res->res_dirty) ? res->func->dirty_prio :
		res->func->prio;

	while (*new) {
		struct vmw_resource *this =
			container_of(*new, struct vmw_resource, mob_node);

		parent = *new;
		new = (res->guest_memory_offset < this->guest_memory_offset) ?
			&((*new)->rb_left) : &((*new)->rb_right);
	}

	rb_link_node(&res->mob_node, parent, new);
	rb_insert_color(&res->mob_node, &gbo->res_tree);
	vmw_bo_del_detached_resource(gbo, res);

	vmw_bo_prio_add(gbo, res->used_prio);
}

/**
 * vmw_resource_mob_detach - Mark a resource as detached from its backing mob
 * @res: The resource
 */
void vmw_resource_mob_detach(struct vmw_resource *res)
{
	struct vmw_bo *gbo = res->guest_memory_bo;

	dma_resv_assert_held(gbo->tbo.base.resv);
	if (vmw_resource_mob_attached(res)) {
		rb_erase(&res->mob_node, &gbo->res_tree);
		RB_CLEAR_NODE(&res->mob_node);
		vmw_bo_prio_del(gbo, res->used_prio);
	}
}

struct vmw_resource *vmw_resource_reference(struct vmw_resource *res)
{
	kref_get(&res->kref);
	return res;
}

struct vmw_resource *
vmw_resource_reference_unless_doomed(struct vmw_resource *res)
{
	return kref_get_unless_zero(&res->kref) ? res : NULL;
}

/**
 * vmw_resource_release_id - release a resource id to the id manager.
 *
 * @res: Pointer to the resource.
 *
 * Release the resource id to the resource id manager and set it to -1
 */
void vmw_resource_release_id(struct vmw_resource *res)
{
	struct vmw_private *dev_priv = res->dev_priv;
	struct idr *idr = &dev_priv->res_idr[res->func->res_type];

	spin_lock(&dev_priv->resource_lock);
	if (res->id != -1)
		idr_remove(idr, res->id);
	res->id = -1;
	spin_unlock(&dev_priv->resource_lock);
}

static void vmw_resource_release(struct kref *kref)
{
	struct vmw_resource *res =
	    container_of(kref, struct vmw_resource, kref);
	struct vmw_private *dev_priv = res->dev_priv;
	int id;
	int ret;
	struct idr *idr = &dev_priv->res_idr[res->func->res_type];

	spin_lock(&dev_priv->resource_lock);
	list_del_init(&res->lru_head);
	spin_unlock(&dev_priv->resource_lock);
	if (res->guest_memory_bo) {
		struct ttm_buffer_object *bo = &res->guest_memory_bo->tbo;

		ret = ttm_bo_reserve(bo, false, false, NULL);
		BUG_ON(ret);
		if (vmw_resource_mob_attached(res) &&
		    res->func->unbind != NULL) {
			struct ttm_validate_buffer val_buf;

			val_buf