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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 "vmwgfx_drv.h"
32#include "ttm/ttm_module.h"
33#include "ttm/ttm_bo_driver.h"
34#include "ttm/ttm_placement.h"
35#include <linux/idr.h>
36#include <linux/spinlock.h>
37#include <linux/kernel.h>
38
39struct vmwgfx_gmrid_man {
40 spinlock_t lock;
41 struct ida gmr_ida;
42 uint32_t max_gmr_ids;
43};
44
45static int vmw_gmrid_man_get_node(struct ttm_mem_type_manager *man,
46 struct ttm_buffer_object *bo,
47 struct ttm_placement *placement,
48 struct ttm_mem_reg *mem)
49{
50 struct vmwgfx_gmrid_man *gman =
51 (struct vmwgfx_gmrid_man *)man->priv;
52 int ret;
53 int id;
54
55 mem->mm_node = NULL;
56
57 do {
58 if (unlikely(ida_pre_get(&gman->gmr_ida, GFP_KERNEL) == 0))
59 return -ENOMEM;
60
61 spin_lock(&gman->lock);
62 ret = ida_get_new(&gman->gmr_ida, &id);
63
64 if (unlikely(ret == 0 && id >= gman->max_gmr_ids)) {
65 ida_remove(&gman->gmr_ida, id);
66 spin_unlock(&gman->lock);
67 return 0;
68 }
69
70 spin_unlock(&gman->lock);
71
72 } while (ret == -EAGAIN);
73
74 if (likely(ret == 0)) {
75 mem->mm_node = gman;
76 mem->start = id;
77 }
78
79 return ret;
80}
81
82static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man,
83 struct ttm_mem_reg *mem)
84{
85 struct vmwgfx_gmrid_man *gman =
86 (struct vmwgfx_gmrid_man *)man->priv;
87
88 if (mem->mm_node) {
89 spin_lock(&gman->lock);
90 ida_remove(&gman->gmr_ida, mem->start);
91 spin_unlock(&gman->lock);
92 mem->mm_node = NULL;
93 }
94}
95
96static int vmw_gmrid_man_init(struct ttm_mem_type_manager *man,
97 unsigned long p_size)
98{
99 struct vmwgfx_gmrid_man *gman =
100 kzalloc(sizeof(*gman), GFP_KERNEL);
101
102 if (unlikely(gman == NULL))
103 return -ENOMEM;
104
105 spin_lock_init(&gman->lock);
106 ida_init(&gman->gmr_ida);
107 gman->max_gmr_ids = p_size;
108 man->priv = (void *) gman;
109 return 0;
110}
111
112static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man)
113{
114 struct vmwgfx_gmrid_man *gman =
115 (struct vmwgfx_gmrid_man *)man->priv;
116
117 if (gman) {
118 ida_destroy(&gman->gmr_ida);
119 kfree(gman);
120 }
121 return 0;
122}
123
124static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man,
125 const char *prefix)
126{
127 printk(KERN_INFO "%s: No debug info available for the GMR "
128 "id manager.\n", prefix);
129}
130
131const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = {
132 vmw_gmrid_man_init,
133 vmw_gmrid_man_takedown,
134 vmw_gmrid_man_get_node,
135 vmw_gmrid_man_put_node,
136 vmw_gmrid_man_debug
137};
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 "vmwgfx_drv.h"
32#include "ttm/ttm_module.h"
33#include "ttm/ttm_bo_driver.h"
34#include "ttm/ttm_placement.h"
35#include <linux/idr.h>
36#include <linux/spinlock.h>
37#include <linux/kernel.h>
38
39struct vmwgfx_gmrid_man {
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
47static int vmw_gmrid_man_get_node(struct ttm_mem_type_manager *man,
48 struct ttm_buffer_object *bo,
49 struct ttm_placement *placement,
50 struct ttm_mem_reg *mem)
51{
52 struct vmwgfx_gmrid_man *gman =
53 (struct vmwgfx_gmrid_man *)man->priv;
54 int ret = 0;
55 int id;
56
57 mem->mm_node = NULL;
58
59 spin_lock(&gman->lock);
60
61 if (gman->max_gmr_pages > 0) {
62 gman->used_gmr_pages += bo->num_pages;
63 if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages))
64 goto out_err_locked;
65 }
66
67 do {
68 spin_unlock(&gman->lock);
69 if (unlikely(ida_pre_get(&gman->gmr_ida, GFP_KERNEL) == 0)) {
70 ret = -ENOMEM;
71 goto out_err;
72 }
73 spin_lock(&gman->lock);
74
75 ret = ida_get_new(&gman->gmr_ida, &id);
76 if (unlikely(ret == 0 && id >= gman->max_gmr_ids)) {
77 ida_remove(&gman->gmr_ida, id);
78 ret = 0;
79 goto out_err_locked;
80 }
81 } while (ret == -EAGAIN);
82
83 if (likely(ret == 0)) {
84 mem->mm_node = gman;
85 mem->start = id;
86 mem->num_pages = bo->num_pages;
87 } else
88 goto out_err_locked;
89
90 spin_unlock(&gman->lock);
91 return 0;
92
93out_err:
94 spin_lock(&gman->lock);
95out_err_locked:
96 gman->used_gmr_pages -= bo->num_pages;
97 spin_unlock(&gman->lock);
98 return ret;
99}
100
101static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man,
102 struct ttm_mem_reg *mem)
103{
104 struct vmwgfx_gmrid_man *gman =
105 (struct vmwgfx_gmrid_man *)man->priv;
106
107 if (mem->mm_node) {
108 spin_lock(&gman->lock);
109 ida_remove(&gman->gmr_ida, mem->start);
110 gman->used_gmr_pages -= mem->num_pages;
111 spin_unlock(&gman->lock);
112 mem->mm_node = NULL;
113 }
114}
115
116static int vmw_gmrid_man_init(struct ttm_mem_type_manager *man,
117 unsigned long p_size)
118{
119 struct vmw_private *dev_priv =
120 container_of(man->bdev, struct vmw_private, bdev);
121 struct vmwgfx_gmrid_man *gman =
122 kzalloc(sizeof(*gman), GFP_KERNEL);
123
124 if (unlikely(gman == NULL))
125 return -ENOMEM;
126
127 spin_lock_init(&gman->lock);
128 gman->max_gmr_pages = dev_priv->max_gmr_pages;
129 gman->used_gmr_pages = 0;
130 ida_init(&gman->gmr_ida);
131 gman->max_gmr_ids = p_size;
132 man->priv = (void *) gman;
133 return 0;
134}
135
136static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man)
137{
138 struct vmwgfx_gmrid_man *gman =
139 (struct vmwgfx_gmrid_man *)man->priv;
140
141 if (gman) {
142 ida_destroy(&gman->gmr_ida);
143 kfree(gman);
144 }
145 return 0;
146}
147
148static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man,
149 const char *prefix)
150{
151 printk(KERN_INFO "%s: No debug info available for the GMR "
152 "id manager.\n", prefix);
153}
154
155const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = {
156 vmw_gmrid_man_init,
157 vmw_gmrid_man_takedown,
158 vmw_gmrid_man_get_node,
159 vmw_gmrid_man_put_node,
160 vmw_gmrid_man_debug
161};