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 <sys/cdefs.h>
32__FBSDID("$FreeBSD$");
33
34#include <dev/drm2/drmP.h>
35#include <dev/drm2/ttm/ttm_module.h>
36#include <dev/drm2/ttm/ttm_bo_driver.h>
37#include <dev/drm2/ttm/ttm_placement.h>
38#include <dev/drm2/drm_mm.h>
39
40/**
41 * Currently we use a spinlock for the lock, but a mutex *may* be
42 * more appropriate to reduce scheduling latency if the range manager
43 * ends up with very fragmented allocation patterns.
44 */
45
46struct ttm_range_manager {
47	struct drm_mm mm;
48	struct mtx lock;
49};
50
51MALLOC_DEFINE(M_TTM_RMAN, "ttm_rman", "TTM Range Manager");
52
53static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
54			       struct ttm_buffer_object *bo,
55			       struct ttm_placement *placement,
56			       struct ttm_mem_reg *mem)
57{
58	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
59	struct drm_mm *mm = &rman->mm;
60	struct drm_mm_node *node = NULL;
61	unsigned long lpfn;
62	int ret;
63
64	lpfn = placement->lpfn;
65	if (!lpfn)
66		lpfn = man->size;
67	do {
68		ret = drm_mm_pre_get(mm);
69		if (unlikely(ret))
70			return ret;
71
72		mtx_lock(&rman->lock);
73		node = drm_mm_search_free_in_range(mm,
74					mem->num_pages, mem->page_alignment,
75					placement->fpfn, lpfn, 1);
76		if (unlikely(node == NULL)) {
77			mtx_unlock(&rman->lock);
78			return 0;
79		}
80		node = drm_mm_get_block_atomic_range(node, mem->num_pages,
81						     mem->page_alignment,
82						     placement->fpfn,
83						     lpfn);
84		mtx_unlock(&rman->lock);
85	} while (node == NULL);
86
87	mem->mm_node = node;
88	mem->start = node->start;
89	return 0;
90}
91
92static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
93				struct ttm_mem_reg *mem)
94{
95	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
96
97	if (mem->mm_node) {
98		mtx_lock(&rman->lock);
99		drm_mm_put_block(mem->mm_node);
100		mtx_unlock(&rman->lock);
101		mem->mm_node = NULL;
102	}
103}
104
105static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
106			   unsigned long p_size)
107{
108	struct ttm_range_manager *rman;
109	int ret;
110
111	rman = malloc(sizeof(*rman), M_TTM_RMAN, M_ZERO | M_WAITOK);
112	ret = drm_mm_init(&rman->mm, 0, p_size);
113	if (ret) {
114		free(rman, M_TTM_RMAN);
115		return ret;
116	}
117
118	mtx_init(&rman->lock, "ttmrman", NULL, MTX_DEF);
119	man->priv = rman;
120	return 0;
121}
122
123static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
124{
125	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
126	struct drm_mm *mm = &rman->mm;
127
128	mtx_lock(&rman->lock);
129	if (drm_mm_clean(mm)) {
130		drm_mm_takedown(mm);
131		mtx_unlock(&rman->lock);
132		mtx_destroy(&rman->lock);
133		free(rman, M_TTM_RMAN);
134		man->priv = NULL;
135		return 0;
136	}
137	mtx_unlock(&rman->lock);
138	return -EBUSY;
139}
140
141static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
142			     const char *prefix)
143{
144	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
145
146	mtx_lock(&rman->lock);
147	drm_mm_debug_table(&rman->mm, prefix);
148	mtx_unlock(&rman->lock);
149}
150
151const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
152	ttm_bo_man_init,
153	ttm_bo_man_takedown,
154	ttm_bo_man_get_node,
155	ttm_bo_man_put_node,
156	ttm_bo_man_debug
157};
158