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  • Committer: Bazaar Package Importer
  • Author(s): Bastian Blank
  • Date: 2010-05-06 15:47:38 UTC
  • mto: (1.3.1) (15.1.1 sid) (4.1.1 experimental)
  • mto: This revision was merged to the branch mainline in revision 3.
  • Revision ID: james.westby@ubuntu.com-20100506154738-agoz0rlafrh1fnq7
Tags: upstream-4.0.0
Import upstream version 4.0.0

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tools/memshr/interface.c
 
1
/******************************************************************************
 
2
 *
 
3
 * Copyright (c) 2009 Citrix Systems, Inc. (Grzegorz Milos)
 
4
 *
 
5
 * This program is free software; you can redistribute it and/or modify
 
6
 * it under the terms of the GNU General Public License as published by
 
7
 * the Free Software Foundation; either version 2 of the License, or
 
8
 * (at your option) any later version.
 
9
 *
 
10
 * This program is distributed in the hope that it will be useful,
 
11
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 
12
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
13
 * GNU General Public License for more details.
 
14
 *
 
15
 * You should have received a copy of the GNU General Public License
 
16
 * along with this program; if not, write to the Free Software
 
17
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
18
 */
 
19
#include <string.h>
 
20
#include <inttypes.h>
 
21
 
 
22
#include "memshr.h"
 
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#include "memshr-priv.h"
 
24
#include "bidir-hash.h"
 
25
#include "shm.h"
 
26
#include "bidir-daemon.h"
 
27
 
 
28
typedef struct {
 
29
    int     enabled;
 
30
    domid_t domid;
 
31
    int     xc_handle;
 
32
} memshr_vbd_info_t;
 
33
 
 
34
memshr_vbd_info_t vbd_info = {0, DOMID_INVALID};
 
35
 
 
36
 
 
37
typedef struct {
 
38
    struct shared_memshr_info *shared_info;
 
39
    struct fgprtshr_hash      *fgprts;
 
40
    struct blockshr_hash      *blks;
 
41
} private_memshr_info_t;
 
42
 
 
43
private_memshr_info_t memshr;
 
44
 
 
45
#define SHARED_INFO  (memshr.shared_info)
 
46
 
 
47
void memshr_set_domid(int domid)
 
48
{
 
49
    vbd_info.domid = domid;
 
50
}
 
51
 
 
52
void memshr_daemon_initialize(void)
 
53
{
 
54
    void *shm_base_addr;
 
55
    struct fgprtshr_hash *h;
 
56
 
 
57
    memset(&memshr, 0, sizeof(private_memshr_info_t));
 
58
 
 
59
    if((SHARED_INFO = shm_shared_info_open(1)) == NULL)
 
60
    {
 
61
        DPRINTF("Failed to init shared info.\n");
 
62
        return;
 
63
    }
 
64
 
 
65
    if((memshr.fgprts = shm_fgprtshr_hash_open(1)) == NULL) 
 
66
    {
 
67
        DPRINTF("Failed to init fgprtshr hash.\n");
 
68
        return;
 
69
    }
 
70
    memshr.shared_info->fgprtshr_hash_inited = 1;
 
71
 
 
72
    if((memshr.blks = shm_blockshr_hash_open(1)) == NULL) 
 
73
    {
 
74
        DPRINTF("Failed to init blockshr hash.\n");
 
75
        return;
 
76
    }
 
77
    memshr.shared_info->blockshr_hash_inited = 1;
 
78
    
 
79
    bidir_daemon_initialize(memshr.blks);
 
80
}
 
81
 
 
82
 
 
83
void memshr_vbd_initialize(void)
 
84
{
 
85
    int xc_handle;
 
86
 
 
87
    memset(&memshr, 0, sizeof(private_memshr_info_t));
 
88
 
 
89
    if((SHARED_INFO = shm_shared_info_open(0)) == NULL)
 
90
    {
 
91
        DPRINTF("Failed to open shared info.\n");
 
92
        return;
 
93
    }
 
94
 
 
95
    if(!SHARED_INFO->fgprtshr_hash_inited)
 
96
    {
 
97
        DPRINTF("fgprtshr hash not inited.\n");
 
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        return;
 
99
    }
 
100
 
 
101
    if((memshr.fgprts = shm_fgprtshr_hash_open(0)) == NULL)
 
102
    {
 
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        DPRINTF("Failed to open fgprtshr_hash.\n");
 
104
        return;
 
105
    }
 
106
 
 
107
    if((memshr.blks = shm_blockshr_hash_open(0)) == NULL)
 
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    {
 
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        DPRINTF("Failed to open blockshr_hash.\n");
 
110
        return;
 
111
    }
 
112
 
 
113
    if(vbd_info.domid == DOMID_INVALID)
 
114
        return;
 
115
 
 
116
    if((xc_handle = xc_interface_open()) < 0)
 
117
    {
 
118
        DPRINTF("Failed to open XC interface.\n");
 
119
        return;
 
120
    }
 
121
 
 
122
    vbd_info.xc_handle = xc_handle;
 
123
    vbd_info.enabled = 1;
 
124
}
 
125
 
 
126
uint16_t memshr_vbd_image_get(char* file)
 
127
{
 
128
    uint16_t id;
 
129
 
 
130
    if(pthread_mutex_lock(&SHARED_INFO->lock)) goto error_out;
 
131
    id = shm_vbd_image_get(file, SHARED_INFO->vbd_images);
 
132
    if(pthread_mutex_unlock(&SHARED_INFO->lock)) goto error_out;
 
133
 
 
134
    return id;
 
135
error_out:
 
136
    return 0;    
 
137
}
 
138
 
 
139
void memshr_vbd_image_put(uint16_t memshr_id)
 
140
{
 
141
    if(pthread_mutex_lock(&SHARED_INFO->lock)) return;
 
142
    shm_vbd_image_put(memshr_id, SHARED_INFO->vbd_images);
 
143
    if(pthread_mutex_unlock(&SHARED_INFO->lock)) return;
 
144
}
 
145
    
 
146
int memshr_vbd_issue_ro_request(char *buf,
 
147
                                grant_ref_t gref,
 
148
                                uint16_t file_id, 
 
149
                                uint64_t sec, 
 
150
                                int secs,
 
151
                                uint64_t *hnd)
 
152
{
 
153
    vbdblk_t blk;
 
154
    uint64_t s_hnd, c_hnd;
 
155
    int ret;
 
156
 
 
157
    *hnd = 0;
 
158
    if(!vbd_info.enabled) 
 
159
        return -1;
 
160
 
 
161
    if(secs != 8)
 
162
        return -2;
 
163
 
 
164
    /* Nominate the granted page for sharing */
 
165
    ret = xc_memshr_nominate_gref(vbd_info.xc_handle,
 
166
                                  vbd_info.domid,
 
167
                                  gref,
 
168
                                  &c_hnd);
 
169
    /* If page couldn't be made sharable, we cannot do anything about it */
 
170
    if(ret != 0)
 
171
        return -3;
 
172
    *hnd = c_hnd;
 
173
 
 
174
    /* Check if we've read matching disk block previously */
 
175
    blk.sec     = sec;
 
176
    blk.disk_id = file_id;
 
177
    if(blockshr_block_lookup(memshr.blks, blk, &s_hnd) > 0)
 
178
    {
 
179
        ret = xc_memshr_share(vbd_info.xc_handle, s_hnd, c_hnd);
 
180
        if(!ret) return 0;
 
181
        /* Handles failed to be shared => at least one of them must be invalid,
 
182
           remove the relevant ones from the map */
 
183
        switch(ret)
 
184
        {
 
185
            case XEN_DOMCTL_MEM_SHARING_S_HANDLE_INVALID:
 
186
                ret = blockshr_shrhnd_remove(memshr.blks, s_hnd, NULL);
 
187
                if(ret) DPRINTF("Could not rm invl s_hnd: %"PRId64"\n", s_hnd);
 
188
                break;
 
189
            case XEN_DOMCTL_MEM_SHARING_C_HANDLE_INVALID:
 
190
                ret = blockshr_shrhnd_remove(memshr.blks, c_hnd, NULL);
 
191
                if(ret) DPRINTF("Could not rm invl c_hnd: %"PRId64"\n", c_hnd);
 
192
                break;
 
193
            default:
 
194
                break;
 
195
        }
 
196
        return -5;
 
197
    }
 
198
 
 
199
    return -4;
 
200
}
 
201
 
 
202
void memshr_vbd_complete_ro_request(uint64_t hnd,
 
203
                                    uint16_t file_id, 
 
204
                                    uint64_t sec, 
 
205
                                    int secs)
 
206
{
 
207
    vbdblk_t blk;
 
208
    
 
209
    if(!vbd_info.enabled) 
 
210
        return;
 
211
 
 
212
    if(secs != 8)
 
213
        return;
 
214
 
 
215
    blk.sec     = sec;
 
216
    blk.disk_id = file_id;
 
217
    if(blockshr_insert(memshr.blks, blk, hnd) < 0)
 
218
        DPRINTF("Could not insert block hint into hash.\n");
 
219
}