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
38#include <linux/export.h>
39#include <linux/slab.h>
40#include <linux/spinlock.h>
41
42/*
43 * Currently we use a spinlock for the lock, but a mutex *may* be
44 * more appropriate to reduce scheduling latency if the range manager
45 * ends up with very fragmented allocation patterns.
46 */
47
48struct ttm_range_manager {
49 struct ttm_resource_manager manager;
50 struct drm_mm mm;
51 spinlock_t lock;
52};
53
54static inline struct ttm_range_manager *
55to_range_manager(struct ttm_resource_manager *man)
56{
57 return container_of(man, struct ttm_range_manager, manager);
58}
59
60static int ttm_range_man_alloc(struct ttm_resource_manager *man,
61 struct ttm_buffer_object *bo,
62 const struct ttm_place *place,
63 struct ttm_resource **res)
64{
65 struct ttm_range_manager *rman = to_range_manager(man);
66 struct ttm_range_mgr_node *node;
67 struct drm_mm *mm = &rman->mm;
68 enum drm_mm_insert_mode mode;
69 unsigned long lpfn;
70 int ret;
71
72 lpfn = place->lpfn;
73 if (!lpfn)
74 lpfn = man->size;
75
76 node = kzalloc(struct_size(node, mm_nodes, 1), GFP_KERNEL);
77 if (!node)
78 return -ENOMEM;
79
80 mode = DRM_MM_INSERT_BEST;
81 if (place->flags & TTM_PL_FLAG_TOPDOWN)
82 mode = DRM_MM_INSERT_HIGH;
83
84 ttm_resource_init(bo, place, res: &node->base);
85
86 spin_lock(lock: &rman->lock);
87 ret = drm_mm_insert_node_in_range(mm, node: &node->mm_nodes[0],
88 PFN_UP(node->base.size),
89 alignment: bo->page_alignment, color: 0,
90 start: place->fpfn, end: lpfn, mode);
91 spin_unlock(lock: &rman->lock);
92
93 if (unlikely(ret)) {
94 ttm_resource_fini(man, res: &node->base);
95 kfree(objp: node);
96 return ret;
97 }
98
99 node->base.start = node->mm_nodes[0].start;
100 *res = &node->base;
101 return 0;
102}
103
104static void ttm_range_man_free(struct ttm_resource_manager *man,
105 struct ttm_resource *res)
106{
107 struct ttm_range_mgr_node *node = to_ttm_range_mgr_node(res);
108 struct ttm_range_manager *rman = to_range_manager(man);
109
110 spin_lock(lock: &rman->lock);
111 drm_mm_remove_node(node: &node->mm_nodes[0]);
112 spin_unlock(lock: &rman->lock);
113
114 ttm_resource_fini(man, res);
115 kfree(objp: node);
116}
117
118static bool ttm_range_man_intersects(struct ttm_resource_manager *man,
119 struct ttm_resource *res,
120 const struct ttm_place *place,
121 size_t size)
122{
123 struct drm_mm_node *node = &to_ttm_range_mgr_node(res)->mm_nodes[0];
124 u32 num_pages = PFN_UP(size);
125
126 /* Don't evict BOs outside of the requested placement range */
127 if (place->fpfn >= (node->start + num_pages) ||
128 (place->lpfn && place->lpfn <= node->start))
129 return false;
130
131 return true;
132}
133
134static bool ttm_range_man_compatible(struct ttm_resource_manager *man,
135 struct ttm_resource *res,
136 const struct ttm_place *place,
137 size_t size)
138{
139 struct drm_mm_node *node = &to_ttm_range_mgr_node(res)->mm_nodes[0];
140 u32 num_pages = PFN_UP(size);
141
142 if (node->start < place->fpfn ||
143 (place->lpfn && (node->start + num_pages) > place->lpfn))
144 return false;
145
146 return true;
147}
148
149static void ttm_range_man_debug(struct ttm_resource_manager *man,
150 struct drm_printer *printer)
151{
152 struct ttm_range_manager *rman = to_range_manager(man);
153
154 spin_lock(lock: &rman->lock);
155 drm_mm_print(mm: &rman->mm, p: printer);
156 spin_unlock(lock: &rman->lock);
157}
158
159static const struct ttm_resource_manager_func ttm_range_manager_func = {
160 .alloc = ttm_range_man_alloc,
161 .free = ttm_range_man_free,
162 .intersects = ttm_range_man_intersects,
163 .compatible = ttm_range_man_compatible,
164 .debug = ttm_range_man_debug
165};
166
167/**
168 * ttm_range_man_init_nocheck - Initialise a generic range manager for the
169 * selected memory type.
170 *
171 * @bdev: ttm device
172 * @type: memory manager type
173 * @use_tt: if the memory manager uses tt
174 * @p_size: size of area to be managed in pages.
175 *
176 * The range manager is installed for this device in the type slot.
177 *
178 * Return: %0 on success or a negative error code on failure
179 */
180int ttm_range_man_init_nocheck(struct ttm_device *bdev,
181 unsigned type, bool use_tt,
182 unsigned long p_size)
183{
184 struct ttm_resource_manager *man;
185 struct ttm_range_manager *rman;
186
187 rman = kzalloc(sizeof(*rman), GFP_KERNEL);
188 if (!rman)
189 return -ENOMEM;
190
191 man = &rman->manager;
192 man->use_tt = use_tt;
193
194 man->func = &ttm_range_manager_func;
195
196 ttm_resource_manager_init(man, bdev, size: p_size);
197
198 drm_mm_init(mm: &rman->mm, start: 0, size: p_size);
199 spin_lock_init(&rman->lock);
200
201 ttm_set_driver_manager(bdev, type, manager: &rman->manager);
202 ttm_resource_manager_set_used(man, used: true);
203 return 0;
204}
205EXPORT_SYMBOL(ttm_range_man_init_nocheck);
206
207/**
208 * ttm_range_man_fini_nocheck - Remove the generic range manager from a slot
209 * and tear it down.
210 *
211 * @bdev: ttm device
212 * @type: memory manager type
213 *
214 * Return: %0 on success or a negative error code on failure
215 */
216int ttm_range_man_fini_nocheck(struct ttm_device *bdev,
217 unsigned type)
218{
219 struct ttm_resource_manager *man = ttm_manager_type(bdev, mem_type: type);
220 struct ttm_range_manager *rman = to_range_manager(man);
221 struct drm_mm *mm = &rman->mm;
222 int ret;
223
224 if (!man)
225 return 0;
226
227 ttm_resource_manager_set_used(man, used: false);
228
229 ret = ttm_resource_manager_evict_all(bdev, man);
230 if (ret)
231 return ret;
232
233 spin_lock(lock: &rman->lock);
234 drm_mm_takedown(mm);
235 spin_unlock(lock: &rman->lock);
236
237 ttm_resource_manager_cleanup(man);
238 ttm_set_driver_manager(bdev, type, NULL);
239 kfree(objp: rman);
240 return 0;
241}
242EXPORT_SYMBOL(ttm_range_man_fini_nocheck);
243

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