hw/display/xlnx_dp: Free FIFOs adding xlnx_dp_finalize()
[qemu/ar7.git] / migration / qemu-file-channel.c
blobafc3a7f642af51bd5a7f74c6561da092d4565db2
1 /*
2  * QEMUFile backend for QIOChannel objects
3  *
4  * Copyright (c) 2015-2016 Red Hat, Inc
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to deal
8  * in the Software without restriction, including without limitation the rights
9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10  * copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22  * THE SOFTWARE.
23  */
25 #include "qemu/osdep.h"
26 #include "qemu-file-channel.h"
27 #include "qemu-file.h"
28 #include "io/channel-socket.h"
29 #include "qemu/iov.h"
30 #include "qemu/yank.h"
33 static ssize_t channel_writev_buffer(void *opaque,
34                                      struct iovec *iov,
35                                      int iovcnt,
36                                      int64_t pos,
37                                      Error **errp)
39     QIOChannel *ioc = QIO_CHANNEL(opaque);
40     ssize_t done = 0;
41     struct iovec *local_iov = g_new(struct iovec, iovcnt);
42     struct iovec *local_iov_head = local_iov;
43     unsigned int nlocal_iov = iovcnt;
45     nlocal_iov = iov_copy(local_iov, nlocal_iov,
46                           iov, iovcnt,
47                           0, iov_size(iov, iovcnt));
49     while (nlocal_iov > 0) {
50         ssize_t len;
51         len = qio_channel_writev(ioc, local_iov, nlocal_iov, errp);
52         if (len == QIO_CHANNEL_ERR_BLOCK) {
53             if (qemu_in_coroutine()) {
54                 qio_channel_yield(ioc, G_IO_OUT);
55             } else {
56                 qio_channel_wait(ioc, G_IO_OUT);
57             }
58             continue;
59         }
60         if (len < 0) {
61             done = -EIO;
62             goto cleanup;
63         }
65         iov_discard_front(&local_iov, &nlocal_iov, len);
66         done += len;
67     }
69  cleanup:
70     g_free(local_iov_head);
71     return done;
75 static ssize_t channel_get_buffer(void *opaque,
76                                   uint8_t *buf,
77                                   int64_t pos,
78                                   size_t size,
79                                   Error **errp)
81     QIOChannel *ioc = QIO_CHANNEL(opaque);
82     ssize_t ret;
84     do {
85         ret = qio_channel_read(ioc, (char *)buf, size, errp);
86         if (ret < 0) {
87             if (ret == QIO_CHANNEL_ERR_BLOCK) {
88                 if (qemu_in_coroutine()) {
89                     qio_channel_yield(ioc, G_IO_IN);
90                 } else {
91                     qio_channel_wait(ioc, G_IO_IN);
92                 }
93             } else {
94                 return -EIO;
95             }
96         }
97     } while (ret == QIO_CHANNEL_ERR_BLOCK);
99     return ret;
103 static int channel_close(void *opaque, Error **errp)
105     int ret;
106     QIOChannel *ioc = QIO_CHANNEL(opaque);
107     ret = qio_channel_close(ioc, errp);
108     if (object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_SOCKET)
109         && OBJECT(ioc)->ref == 1) {
110         yank_unregister_function(MIGRATION_YANK_INSTANCE,
111                                  yank_generic_iochannel,
112                                  QIO_CHANNEL(ioc));
113     }
114     object_unref(OBJECT(ioc));
115     return ret;
119 static int channel_shutdown(void *opaque,
120                             bool rd,
121                             bool wr,
122                             Error **errp)
124     QIOChannel *ioc = QIO_CHANNEL(opaque);
126     if (qio_channel_has_feature(ioc,
127                                 QIO_CHANNEL_FEATURE_SHUTDOWN)) {
128         QIOChannelShutdown mode;
129         if (rd && wr) {
130             mode = QIO_CHANNEL_SHUTDOWN_BOTH;
131         } else if (rd) {
132             mode = QIO_CHANNEL_SHUTDOWN_READ;
133         } else {
134             mode = QIO_CHANNEL_SHUTDOWN_WRITE;
135         }
136         if (qio_channel_shutdown(ioc, mode, errp) < 0) {
137             return -EIO;
138         }
139     }
140     return 0;
144 static int channel_set_blocking(void *opaque,
145                                 bool enabled,
146                                 Error **errp)
148     QIOChannel *ioc = QIO_CHANNEL(opaque);
150     if (qio_channel_set_blocking(ioc, enabled, errp) < 0) {
151         return -1;
152     }
153     return 0;
156 static QEMUFile *channel_get_input_return_path(void *opaque)
158     QIOChannel *ioc = QIO_CHANNEL(opaque);
160     return qemu_fopen_channel_output(ioc);
163 static QEMUFile *channel_get_output_return_path(void *opaque)
165     QIOChannel *ioc = QIO_CHANNEL(opaque);
167     return qemu_fopen_channel_input(ioc);
170 static const QEMUFileOps channel_input_ops = {
171     .get_buffer = channel_get_buffer,
172     .close = channel_close,
173     .shut_down = channel_shutdown,
174     .set_blocking = channel_set_blocking,
175     .get_return_path = channel_get_input_return_path,
179 static const QEMUFileOps channel_output_ops = {
180     .writev_buffer = channel_writev_buffer,
181     .close = channel_close,
182     .shut_down = channel_shutdown,
183     .set_blocking = channel_set_blocking,
184     .get_return_path = channel_get_output_return_path,
188 QEMUFile *qemu_fopen_channel_input(QIOChannel *ioc)
190     object_ref(OBJECT(ioc));
191     return qemu_fopen_ops(ioc, &channel_input_ops);
194 QEMUFile *qemu_fopen_channel_output(QIOChannel *ioc)
196     object_ref(OBJECT(ioc));
197     return qemu_fopen_ops(ioc, &channel_output_ops);