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