1 // SPDX-License-Identifier: GPL-2.0 OR MIT
2 /**************************************************************************
3 *
4 * Copyright 2007-2010 VMware, Inc., Palo Alto, CA., USA
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 "vmwgfx_drv.h"
32 #include <drm/ttm/ttm_bo_driver.h>
33 #include <drm/ttm/ttm_placement.h>
34 #include <linux/idr.h>
35 #include <linux/spinlock.h>
36 #include <linux/kernel.h>
37
38 struct vmwgfx_gmrid_man {
39 struct ttm_resource_manager manager;
40 spinlock_t lock;
41 struct ida gmr_ida;
42 uint32_t max_gmr_ids;
43 uint32_t max_gmr_pages;
44 uint32_t used_gmr_pages;
45 };
46
to_gmrid_manager(struct ttm_resource_manager * man)47 static struct vmwgfx_gmrid_man *to_gmrid_manager(struct ttm_resource_manager *man)
48 {
49 return container_of(man, struct vmwgfx_gmrid_man, manager);
50 }
51
vmw_gmrid_man_get_node(struct ttm_resource_manager * man,struct ttm_buffer_object * bo,const struct ttm_place * place,struct ttm_resource * mem)52 static int vmw_gmrid_man_get_node(struct ttm_resource_manager *man,
53 struct ttm_buffer_object *bo,
54 const struct ttm_place *place,
55 struct ttm_resource *mem)
56 {
57 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
58 int id;
59
60 id = ida_alloc_max(&gman->gmr_ida, gman->max_gmr_ids - 1, GFP_KERNEL);
61 if (id < 0)
62 return id;
63
64 spin_lock(&gman->lock);
65
66 if (gman->max_gmr_pages > 0) {
67 gman->used_gmr_pages += mem->num_pages;
68 if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages))
69 goto nospace;
70 }
71
72 mem->mm_node = gman;
73 mem->start = id;
74
75 spin_unlock(&gman->lock);
76 return 0;
77
78 nospace:
79 gman->used_gmr_pages -= mem->num_pages;
80 spin_unlock(&gman->lock);
81 ida_free(&gman->gmr_ida, id);
82 return -ENOSPC;
83 }
84
vmw_gmrid_man_put_node(struct ttm_resource_manager * man,struct ttm_resource * mem)85 static void vmw_gmrid_man_put_node(struct ttm_resource_manager *man,
86 struct ttm_resource *mem)
87 {
88 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
89
90 if (mem->mm_node) {
91 ida_free(&gman->gmr_ida, mem->start);
92 spin_lock(&gman->lock);
93 gman->used_gmr_pages -= mem->num_pages;
94 spin_unlock(&gman->lock);
95 mem->mm_node = NULL;
96 }
97 }
98
99 static const struct ttm_resource_manager_func vmw_gmrid_manager_func;
100
vmw_gmrid_man_init(struct vmw_private * dev_priv,int type)101 int vmw_gmrid_man_init(struct vmw_private *dev_priv, int type)
102 {
103 struct ttm_resource_manager *man;
104 struct vmwgfx_gmrid_man *gman =
105 kzalloc(sizeof(*gman), GFP_KERNEL);
106
107 if (unlikely(!gman))
108 return -ENOMEM;
109
110 man = &gman->manager;
111
112 man->func = &vmw_gmrid_manager_func;
113 /* TODO: This is most likely not correct */
114 man->use_tt = true;
115 ttm_resource_manager_init(man, 0);
116 spin_lock_init(&gman->lock);
117 gman->used_gmr_pages = 0;
118 ida_init(&gman->gmr_ida);
119
120 switch (type) {
121 case VMW_PL_GMR:
122 gman->max_gmr_ids = dev_priv->max_gmr_ids;
123 gman->max_gmr_pages = dev_priv->max_gmr_pages;
124 break;
125 case VMW_PL_MOB:
126 gman->max_gmr_ids = VMWGFX_NUM_MOB;
127 gman->max_gmr_pages = dev_priv->max_mob_pages;
128 break;
129 default:
130 BUG();
131 }
132 ttm_set_driver_manager(&dev_priv->bdev, type, &gman->manager);
133 ttm_resource_manager_set_used(man, true);
134 return 0;
135 }
136
vmw_gmrid_man_fini(struct vmw_private * dev_priv,int type)137 void vmw_gmrid_man_fini(struct vmw_private *dev_priv, int type)
138 {
139 struct ttm_resource_manager *man = ttm_manager_type(&dev_priv->bdev, type);
140 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
141
142 ttm_resource_manager_set_used(man, false);
143
144 ttm_resource_manager_evict_all(&dev_priv->bdev, man);
145
146 ttm_resource_manager_cleanup(man);
147
148 ttm_set_driver_manager(&dev_priv->bdev, type, NULL);
149 ida_destroy(&gman->gmr_ida);
150 kfree(gman);
151
152 }
153
154 static const struct ttm_resource_manager_func vmw_gmrid_manager_func = {
155 .alloc = vmw_gmrid_man_get_node,
156 .free = vmw_gmrid_man_put_node,
157 };
158