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Commit	Line	Data
	1	/**************************************************************************
	2	*
	3	* Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA
	4	* All Rights Reserved.
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a
	7	* copy of this software and associated documentation files (the
	8	* "Software"), to deal in the Software without restriction, including
	9	* without limitation the rights to use, copy, modify, merge, publish,
	10	* distribute, sub license, and/or sell copies of the Software, and to
	11	* permit persons to whom the Software is furnished to do so, subject to
	12	* the following conditions:
	13	*
	14	* The above copyright notice and this permission notice (including the
	15	* next paragraph) shall be included in all copies or substantial portions
	16	* of the Software.
	17	*
	18	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	19	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	20	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
	21	* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
	22	* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
	23	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
	24	* USE OR OTHER DEALINGS IN THE SOFTWARE.
	25	*
	26	**************************************************************************/
	27	/*
	28	* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
	29	*/
	30
	31	#include <drm/ttm/ttm_module.h>
	32	#include <drm/ttm/ttm_bo_driver.h>
	33	#include <drm/ttm/ttm_placement.h>
	34	#include <drm/drm_mm.h>
	35	#include <linux/slab.h>
	36	#include <linux/spinlock.h>
	37	#include <linux/module.h>
	38
	39	/**
	40	* Currently we use a spinlock for the lock, but a mutex may be
	41	* more appropriate to reduce scheduling latency if the range manager
	42	* ends up with very fragmented allocation patterns.
	43	*/
	44
	45	struct ttm_range_manager {
	46	struct drm_mm mm;
	47	struct lock lock;
	48	};
	49
	50	static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
	51	struct ttm_buffer_object *bo,
	52	struct ttm_placement *placement,
	53	struct ttm_mem_reg *mem)
	54	{
	55	struct ttm_range_manager rman = (struct ttm_range_manager ) man->priv;
	56	struct drm_mm *mm = &rman->mm;
	57	struct drm_mm_node *node = NULL;
	58	enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT;
	59	unsigned long lpfn;
	60	int ret;
	61
	62	lpfn = placement->lpfn;
	63	if (!lpfn)
	64	lpfn = man->size;
	65
	66	node = kzalloc(sizeof(*node), GFP_KERNEL);
	67	if (!node)
	68	return -ENOMEM;
	69	/* not in yet ?
	70	if (placement->flags & TTM_PL_FLAG_TOPDOWN)
	71	aflags = DRM_MM_CREATE_TOP;
	72	*/
	73
	74	lockmgr(&rman->lock, LK_EXCLUSIVE);
	75	ret = drm_mm_insert_node_in_range_generic(mm, node, mem->num_pages,
	76	mem->page_alignment, 0,
	77	placement->fpfn, lpfn,
	78	DRM_MM_SEARCH_BEST,
	79	aflags);
	80	lockmgr(&rman->lock, LK_RELEASE);
	81
	82	if (unlikely(ret)) {
	83	kfree(node);
	84	} else {
	85	mem->mm_node = node;
	86	mem->start = node->start;
	87	}
	88	return 0;
	89	}
	90
	91	static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
	92	struct ttm_mem_reg *mem)
	93	{
	94	struct ttm_range_manager rman = (struct ttm_range_manager ) man->priv;
	95
	96	if (mem->mm_node) {
	97	lockmgr(&rman->lock, LK_EXCLUSIVE);
	98	drm_mm_put_block(mem->mm_node);
	99	lockmgr(&rman->lock, LK_RELEASE);
	100	mem->mm_node = NULL;
	101	}
	102	}
	103
	104	static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
	105	unsigned long p_size)
	106	{
	107	struct ttm_range_manager *rman;
	108
	109	rman = kzalloc(sizeof(*rman), GFP_KERNEL);
	110	if (!rman)
	111	return -ENOMEM;
	112
	113	drm_mm_init(&rman->mm, 0, p_size);
	114	lockinit(&rman->lock, "ttmrman", 0, LK_CANRECURSE);
	115	man->priv = rman;
	116	return 0;
	117	}
	118
	119	static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
	120	{
	121	struct ttm_range_manager rman = (struct ttm_range_manager ) man->priv;
	122	struct drm_mm *mm = &rman->mm;
	123
	124	lockmgr(&rman->lock, LK_EXCLUSIVE);
	125	if (drm_mm_clean(mm)) {
	126	drm_mm_takedown(mm);
	127	lockmgr(&rman->lock, LK_RELEASE);
	128	kfree(rman);
	129	man->priv = NULL;
	130	return 0;
	131	}
	132	lockmgr(&rman->lock, LK_RELEASE);
	133	return -EBUSY;
	134	}
	135
	136	static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
	137	const char *prefix)
	138	{
	139	struct ttm_range_manager rman = (struct ttm_range_manager ) man->priv;
	140
	141	lockmgr(&rman->lock, LK_EXCLUSIVE);
	142	drm_mm_debug_table(&rman->mm, prefix);
	143	lockmgr(&rman->lock, LK_RELEASE);
	144	}
	145
	146	const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
	147	ttm_bo_man_init,
	148	ttm_bo_man_takedown,
	149	ttm_bo_man_get_node,
	150	ttm_bo_man_put_node,
	151	ttm_bo_man_debug
	152	};
	153	EXPORT_SYMBOL(ttm_bo_manager_func);