hw/ide/core: Trivial typo fix
[qemu.git] / contrib / libvhost-user / libvhost-user-glib.c
1 /*
2 * Vhost User library
3 *
4 * Copyright (c) 2016 Nutanix Inc. All rights reserved.
5 * Copyright (c) 2017 Red Hat, Inc.
6 *
7 * Authors:
8 * Marc-André Lureau <mlureau@redhat.com>
9 * Felipe Franciosi <felipe@nutanix.com>
10 *
11 * This work is licensed under the terms of the GNU GPL, version 2 or
12 * later. See the COPYING file in the top-level directory.
13 */
14
15 #include "qemu/osdep.h"
16
17 #include "libvhost-user-glib.h"
18
19 /* glib event loop integration for libvhost-user and misc callbacks */
20
21 G_STATIC_ASSERT((int)G_IO_IN == (int)VU_WATCH_IN);
22 G_STATIC_ASSERT((int)G_IO_OUT == (int)VU_WATCH_OUT);
23 G_STATIC_ASSERT((int)G_IO_PRI == (int)VU_WATCH_PRI);
24 G_STATIC_ASSERT((int)G_IO_ERR == (int)VU_WATCH_ERR);
25 G_STATIC_ASSERT((int)G_IO_HUP == (int)VU_WATCH_HUP);
26
27 typedef struct VugSrc {
28 GSource parent;
29 VuDev *dev;
30 GPollFD gfd;
31 } VugSrc;
32
33 static gboolean
34 vug_src_prepare(GSource *gsrc, gint *timeout)
35 {
36 g_assert(timeout);
37
38 *timeout = -1;
39 return FALSE;
40 }
41
42 static gboolean
43 vug_src_check(GSource *gsrc)
44 {
45 VugSrc *src = (VugSrc *)gsrc;
46
47 g_assert(src);
48
49 return src->gfd.revents & src->gfd.events;
50 }
51
52 static gboolean
53 vug_src_dispatch(GSource *gsrc, GSourceFunc cb, gpointer data)
54 {
55 VugSrc *src = (VugSrc *)gsrc;
56
57 g_assert(src);
58
59 ((vu_watch_cb)cb)(src->dev, src->gfd.revents, data);
60
61 return G_SOURCE_CONTINUE;
62 }
63
64 static GSourceFuncs vug_src_funcs = {
65 vug_src_prepare,
66 vug_src_check,
67 vug_src_dispatch,
68 NULL
69 };
70
71 GSource *
72 vug_source_new(VugDev *gdev, int fd, GIOCondition cond,
73 vu_watch_cb vu_cb, gpointer data)
74 {
75 VuDev *dev = &gdev->parent;
76 GSource *gsrc;
77 VugSrc *src;
78 guint id;
79
80 g_assert(gdev);
81 g_assert(fd >= 0);
82 g_assert(vu_cb);
83
84 gsrc = g_source_new(&vug_src_funcs, sizeof(VugSrc));
85 g_source_set_callback(gsrc, (GSourceFunc)vu_cb, data, NULL);
86 src = (VugSrc *)gsrc;
87 src->dev = dev;
88 src->gfd.fd = fd;
89 src->gfd.events = cond;
90
91 g_source_add_poll(gsrc, &src->gfd);
92 id = g_source_attach(gsrc, g_main_context_get_thread_default());
93 g_assert(id);
94
95 return gsrc;
96 }
97
98 static void
99 set_watch(VuDev *vu_dev, int fd, int vu_evt, vu_watch_cb cb, void *pvt)
100 {
101 GSource *src;
102 VugDev *dev;
103
104 g_assert(vu_dev);
105 g_assert(fd >= 0);
106 g_assert(cb);
107
108 dev = container_of(vu_dev, VugDev, parent);
109 src = vug_source_new(dev, fd, vu_evt, cb, pvt);
110 g_hash_table_replace(dev->fdmap, GINT_TO_POINTER(fd), src);
111 }
112
113 static void
114 remove_watch(VuDev *vu_dev, int fd)
115 {
116 VugDev *dev;
117
118 g_assert(vu_dev);
119 g_assert(fd >= 0);
120
121 dev = container_of(vu_dev, VugDev, parent);
122 g_hash_table_remove(dev->fdmap, GINT_TO_POINTER(fd));
123 }
124
125
126 static void vug_watch(VuDev *dev, int condition, void *data)
127 {
128 if (!vu_dispatch(dev) != 0) {
129 dev->panic(dev, "Error processing vhost message");
130 }
131 }
132
133 void vug_source_destroy(GSource *src)
134 {
135 if (!src) {
136 return;
137 }
138
139 g_source_destroy(src);
140 g_source_unref(src);
141 }
142
143 bool
144 vug_init(VugDev *dev, uint16_t max_queues, int socket,
145 vu_panic_cb panic, const VuDevIface *iface)
146 {
147 g_assert(dev);
148 g_assert(iface);
149
150 if (!vu_init(&dev->parent, max_queues, socket, panic, set_watch,
151 remove_watch, iface)) {
152 return false;
153 }
154
155 dev->fdmap = g_hash_table_new_full(NULL, NULL, NULL,
156 (GDestroyNotify) vug_source_destroy);
157
158 dev->src = vug_source_new(dev, socket, G_IO_IN, vug_watch, NULL);
159
160 return true;
161 }
162
163 void
164 vug_deinit(VugDev *dev)
165 {
166 g_assert(dev);
167
168 g_hash_table_unref(dev->fdmap);
169 vug_source_destroy(dev->src);
170 }