1/* SPDX-License-Identifier: GPL-2.0 OR MIT */
2/**************************************************************************
3 *
4 * Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
25 * USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 **************************************************************************/
28/*
29 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
30 */
31
32#include <drm/ttm/ttm_device.h>
33#include <drm/ttm/ttm_placement.h>
34#include <drm/ttm/ttm_range_manager.h>
35#include <drm/ttm/ttm_bo.h>
36#include <drm/drm_mm.h>
37#include <linux/slab.h>
38#include <linux/spinlock.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 ttm_resource_manager manager;
48 struct drm_mm mm;
49 spinlock_t lock;
50};
51
52static inline struct ttm_range_manager *
53to_range_manager(struct ttm_resource_manager *man)
54{
55 return container_of(man, struct ttm_range_manager, manager);
56}
57
58static int ttm_range_man_alloc(struct ttm_resource_manager *man,
59 struct ttm_buffer_object *bo,
60 const struct ttm_place *place,
61 struct ttm_resource **res)
62{
63 struct ttm_range_manager *rman = to_range_manager(man);
64 struct ttm_range_mgr_node *node;
65 struct drm_mm *mm = &rman->mm;
66 enum drm_mm_insert_mode mode;
67 unsigned long lpfn;
68 int ret;
69
70 lpfn = place->lpfn;
71 if (!lpfn)
72 lpfn = man->size;
73
74 node = kzalloc(struct_size(node, mm_nodes, 1), GFP_KERNEL);
75 if (!node)
76 return -ENOMEM;
77
78 mode = DRM_MM_INSERT_BEST;
79 if (place->flags & TTM_PL_FLAG_TOPDOWN)
80 mode = DRM_MM_INSERT_HIGH;
81
82 ttm_resource_init(bo, place, res: &node->base);
83
84 spin_lock(lock: &rman->lock);
85 ret = drm_mm_insert_node_in_range(mm, node: &node->mm_nodes[0],
86 PFN_UP(node->base.size),
87 alignment: bo->page_alignment, color: 0,
88 start: place->fpfn, end: lpfn, mode);
89 spin_unlock(lock: &rman->lock);
90
91 if (unlikely(ret)) {
92 ttm_resource_fini(man, res: &node->base);
93 kfree(objp: node);
94 return ret;
95 }
96
97 node->base.start = node->mm_nodes[0].start;
98 *res = &node->base;
99 return 0;
100}
101
102static void ttm_range_man_free(struct ttm_resource_manager *man,
103 struct ttm_resource *res)
104{
105 struct ttm_range_mgr_node *node = to_ttm_range_mgr_node(res);
106 struct ttm_range_manager *rman = to_range_manager(man);
107
108 spin_lock(lock: &rman->lock);
109 drm_mm_remove_node(node: &node->mm_nodes[0]);
110 spin_unlock(lock: &rman->lock);
111
112 ttm_resource_fini(man, res);
113 kfree(objp: node);
114}
115
116static bool ttm_range_man_intersects(struct ttm_resource_manager *man,
117 struct ttm_resource *res,
118 const struct ttm_place *place,
119 size_t size)
120{
121 struct drm_mm_node *node = &to_ttm_range_mgr_node(res)->mm_nodes[0];
122 u32 num_pages = PFN_UP(size);
123
124 /* Don't evict BOs outside of the requested placement range */
125 if (place->fpfn >= (node->start + num_pages) ||
126 (place->lpfn && place->lpfn <= node->start))
127 return false;
128
129 return true;
130}
131
132static bool ttm_range_man_compatible(struct ttm_resource_manager *man,
133 struct ttm_resource *res,
134 const struct ttm_place *place,
135 size_t size)
136{
137 struct drm_mm_node *node = &to_ttm_range_mgr_node(res)->mm_nodes[0];
138 u32 num_pages = PFN_UP(size);
139
140 if (node->start < place->fpfn ||
141 (place->lpfn && (node->start + num_pages) > place->lpfn))
142 return false;
143
144 return true;
145}
146
147static void ttm_range_man_debug(struct ttm_resource_manager *man,
148 struct drm_printer *printer)
149{
150 struct ttm_range_manager *rman = to_range_manager(man);
151
152 spin_lock(lock: &rman->lock);
153 drm_mm_print(mm: &rman->mm, p: printer);
154 spin_unlock(lock: &rman->lock);
155}
156
157static const struct ttm_resource_manager_func ttm_range_manager_func = {
158 .alloc = ttm_range_man_alloc,
159 .free = ttm_range_man_free,
160 .intersects = ttm_range_man_intersects,
161 .compatible = ttm_range_man_compatible,
162 .debug = ttm_range_man_debug
163};
164
165/**
166 * ttm_range_man_init_nocheck - Initialise a generic range manager for the
167 * selected memory type.
168 *
169 * @bdev: ttm device
170 * @type: memory manager type
171 * @use_tt: if the memory manager uses tt
172 * @p_size: size of area to be managed in pages.
173 *
174 * The range manager is installed for this device in the type slot.
175 *
176 * Return: %0 on success or a negative error code on failure
177 */
178int ttm_range_man_init_nocheck(struct ttm_device *bdev,
179 unsigned type, bool use_tt,
180 unsigned long p_size)
181{
182 struct ttm_resource_manager *man;
183 struct ttm_range_manager *rman;
184
185 rman = kzalloc(size: sizeof(*rman), GFP_KERNEL);
186 if (!rman)
187 return -ENOMEM;
188
189 man = &rman->manager;
190 man->use_tt = use_tt;
191
192 man->func = &ttm_range_manager_func;
193
194 ttm_resource_manager_init(man, bdev, size: p_size);
195
196 drm_mm_init(mm: &rman->mm, start: 0, size: p_size);
197 spin_lock_init(&rman->lock);
198
199 ttm_set_driver_manager(bdev, type, manager: &rman->manager);
200 ttm_resource_manager_set_used(man, used: true);
201 return 0;
202}
203EXPORT_SYMBOL(ttm_range_man_init_nocheck);
204
205/**
206 * ttm_range_man_fini_nocheck - Remove the generic range manager from a slot
207 * and tear it down.
208 *
209 * @bdev: ttm device
210 * @type: memory manager type
211 *
212 * Return: %0 on success or a negative error code on failure
213 */
214int ttm_range_man_fini_nocheck(struct ttm_device *bdev,
215 unsigned type)
216{
217 struct ttm_resource_manager *man = ttm_manager_type(bdev, mem_type: type);
218 struct ttm_range_manager *rman = to_range_manager(man);
219 struct drm_mm *mm = &rman->mm;
220 int ret;
221
222 if (!man)
223 return 0;
224
225 ttm_resource_manager_set_used(man, used: false);
226
227 ret = ttm_resource_manager_evict_all(bdev, man);
228 if (ret)
229 return ret;
230
231 spin_lock(lock: &rman->lock);
232 drm_mm_takedown(mm);
233 spin_unlock(lock: &rman->lock);
234
235 ttm_resource_manager_cleanup(man);
236 ttm_set_driver_manager(bdev, type, NULL);
237 kfree(objp: rman);
238 return 0;
239}
240EXPORT_SYMBOL(ttm_range_man_fini_nocheck);
241

source code of linux/drivers/gpu/drm/ttm/ttm_range_manager.c