linux/drivers/gpu/drm/ttm/ttm_range_manager.c

/* SPDX-License-Identifier: GPL-2.0 OR MIT */
/**************************************************************************
 *
 * Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
 *
 * 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
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/*
 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
 */

#include <drm/ttm/ttm_device.h>
#include <drm/ttm/ttm_placement.h>
#include <drm/ttm/ttm_range_manager.h>
#include <drm/ttm/ttm_bo.h>
#include <drm/drm_mm.h>
#include <linux/slab.h>
#include <linux/spinlock.h>

/*
 * Currently we use a spinlock for the lock, but a mutex *may* be
 * more appropriate to reduce scheduling latency if the range manager
 * ends up with very fragmented allocation patterns.
 */

struct ttm_range_manager { … };

static inline struct ttm_range_manager *
to_range_manager(struct ttm_resource_manager *man)
{ … }

static int ttm_range_man_alloc(struct ttm_resource_manager *man,
			       struct ttm_buffer_object *bo,
			       const struct ttm_place *place,
			       struct ttm_resource **res)
{ … }

static void ttm_range_man_free(struct ttm_resource_manager *man,
			       struct ttm_resource *res)
{ … }

static bool ttm_range_man_intersects(struct ttm_resource_manager *man,
				     struct ttm_resource *res,
				     const struct ttm_place *place,
				     size_t size)
{ … }

static bool ttm_range_man_compatible(struct ttm_resource_manager *man,
				     struct ttm_resource *res,
				     const struct ttm_place *place,
				     size_t size)
{ … }

static void ttm_range_man_debug(struct ttm_resource_manager *man,
				struct drm_printer *printer)
{ … }

static const struct ttm_resource_manager_func ttm_range_manager_func = …;

/**
 * ttm_range_man_init_nocheck - Initialise a generic range manager for the
 * selected memory type.
 *
 * @bdev: ttm device
 * @type: memory manager type
 * @use_tt: if the memory manager uses tt
 * @p_size: size of area to be managed in pages.
 *
 * The range manager is installed for this device in the type slot.
 *
 * Return: %0 on success or a negative error code on failure
 */
int ttm_range_man_init_nocheck(struct ttm_device *bdev,
		       unsigned type, bool use_tt,
		       unsigned long p_size)
{ … }
EXPORT_SYMBOL(…);

/**
 * ttm_range_man_fini_nocheck - Remove the generic range manager from a slot
 * and tear it down.
 *
 * @bdev: ttm device
 * @type: memory manager type
 *
 * Return: %0 on success or a negative error code on failure
 */
int ttm_range_man_fini_nocheck(struct ttm_device *bdev,
		       unsigned type)
{ … }
EXPORT_SYMBOL(…);