[Qemu-devel] [PATCH 24/27] libvhost-user: add glib source helper

[Marc-André Lureau]

Signed-off-by: Marc-André Lureau <address@hidden>
---
 contrib/libvhost-user/libvhost-user-glib.h |  32 +++++++
 contrib/libvhost-user/libvhost-user-glib.c | 145 +++++++++++++++++++++++++++++
 contrib/libvhost-user/Makefile.objs        |   2 +-
 3 files changed, 178 insertions(+), 1 deletion(-)
 create mode 100644 contrib/libvhost-user/libvhost-user-glib.h
 create mode 100644 contrib/libvhost-user/libvhost-user-glib.c

diff --git a/contrib/libvhost-user/libvhost-user-glib.h 
b/contrib/libvhost-user/libvhost-user-glib.h
new file mode 100644
index 0000000000..a4b30824a1
--- /dev/null
+++ b/contrib/libvhost-user/libvhost-user-glib.h
@@ -0,0 +1,32 @@
+/*
+ * Vhost User library
+ *
+ * Copyright (c) 2016 Nutanix Inc. All rights reserved.
+ * Copyright (c) 2017 Red Hat, Inc.
+ *
+ * Authors:
+ *  Marc-André Lureau <address@hidden>
+ *  Felipe Franciosi <address@hidden>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later.  See the COPYING file in the top-level directory.
+ */
+
+#ifndef LIBVHOST_USER_GLIB_H
+#define LIBVHOST_USER_GLIB_H
+
+#include <glib.h>
+#include "libvhost-user.h"
+
+typedef struct VugDev {
+    VuDev parent;
+
+    GMainLoop *loop;
+    GHashTable *fdmap; /* fd -> gsource */
+} VugDev;
+
+void vug_init(VugDev *dev, int socket, GMainLoop *loop,
+              vu_panic_cb panic, const VuDevIface *iface);
+void vug_deinit(VugDev *dev);
+
+#endif /* LIBVHOST_USER_GLIB_H */
diff --git a/contrib/libvhost-user/libvhost-user-glib.c 
b/contrib/libvhost-user/libvhost-user-glib.c
new file mode 100644
index 0000000000..13e095b8e7
--- /dev/null
+++ b/contrib/libvhost-user/libvhost-user-glib.c
@@ -0,0 +1,145 @@
+/*
+ * Vhost User library
+ *
+ * Copyright (c) 2016 Nutanix Inc. All rights reserved.
+ * Copyright (c) 2017 Red Hat, Inc.
+ *
+ * Authors:
+ *  Marc-André Lureau <address@hidden>
+ *  Felipe Franciosi <address@hidden>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later.  See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+
+#include "libvhost-user-glib.h"
+
+/* glib event loop integration for libvhost-user and misc callbacks */
+
+G_STATIC_ASSERT((int)G_IO_IN == (int)VU_WATCH_IN);
+G_STATIC_ASSERT((int)G_IO_OUT == (int)VU_WATCH_OUT);
+G_STATIC_ASSERT((int)G_IO_PRI == (int)VU_WATCH_PRI);
+G_STATIC_ASSERT((int)G_IO_ERR == (int)VU_WATCH_ERR);
+G_STATIC_ASSERT((int)G_IO_HUP == (int)VU_WATCH_HUP);
+
+typedef struct vus_gsrc {
+    GSource parent;
+    VuDev *dev;
+    GPollFD gfd;
+} vus_gsrc_t;
+
+static gboolean
+vus_gsrc_prepare(GSource *src, gint *timeout)
+{
+    g_assert(timeout);
+
+    *timeout = -1;
+    return FALSE;
+}
+
+static gboolean
+vus_gsrc_check(GSource *src)
+{
+    vus_gsrc_t *vus_src = (vus_gsrc_t *)src;
+
+    g_assert(vus_src);
+
+    return vus_src->gfd.revents & vus_src->gfd.events;
+}
+
+static gboolean
+vus_gsrc_dispatch(GSource *src, GSourceFunc cb, gpointer data)
+{
+    vus_gsrc_t *vus_src = (vus_gsrc_t *)src;
+
+    g_assert(vus_src);
+
+    ((vu_watch_cb)cb) (vus_src->dev, vus_src->gfd.revents, data);
+
+    return G_SOURCE_CONTINUE;
+}
+
+static GSourceFuncs vus_gsrc_funcs = {
+    vus_gsrc_prepare,
+    vus_gsrc_check,
+    vus_gsrc_dispatch,
+    NULL
+};
+
+static GSource *
+vug_source_new(VuDev *dev, int fd, GIOCondition cond,
+               vu_watch_cb vu_cb, gpointer data)
+{
+    GSource *vus_gsrc;
+    vus_gsrc_t *vus_src;
+    guint id;
+
+    g_assert(dev);
+    g_assert(fd >= 0);
+    g_assert(vu_cb);
+
+    vus_gsrc = g_source_new(&vus_gsrc_funcs, sizeof(vus_gsrc_t));
+    g_source_set_callback(vus_gsrc, (GSourceFunc) vu_cb, data, NULL);
+    vus_src = (vus_gsrc_t *)vus_gsrc;
+    vus_src->dev = dev;
+    vus_src->gfd.fd = fd;
+    vus_src->gfd.events = cond;
+
+    g_source_add_poll(vus_gsrc, &vus_src->gfd);
+    id = g_source_attach(vus_gsrc, NULL);
+    g_assert(id);
+    g_source_unref(vus_gsrc);
+
+    return vus_gsrc;
+}
+
+static void
+set_watch(VuDev *vu_dev, int fd, int vu_evt, vu_watch_cb cb, void *pvt)
+{
+    GSource *src;
+    VugDev *dev;
+
+    g_assert(vu_dev);
+    g_assert(fd >= 0);
+    g_assert(cb);
+
+    dev = container_of(vu_dev, VugDev, parent);
+    src = vug_source_new(vu_dev, fd, vu_evt, cb, pvt);
+    g_hash_table_replace(dev->fdmap, GINT_TO_POINTER(fd), src);
+}
+
+static void
+remove_watch(VuDev *vu_dev, int fd)
+{
+    VugDev *dev;
+
+    g_assert(vu_dev);
+    g_assert(fd >= 0);
+
+    dev = container_of(vu_dev, VugDev, parent);
+    g_hash_table_remove(dev->fdmap, GINT_TO_POINTER(fd));
+}
+
+void
+vug_init(VugDev *dev, int socket, GMainLoop *loop,
+         vu_panic_cb panic, const VuDevIface *iface)
+{
+    g_assert(dev);
+    g_assert(loop);
+    g_assert(iface);
+
+    vu_init(&dev->parent, socket, panic, set_watch, remove_watch, iface);
+    dev->loop = loop;
+    dev->fdmap = g_hash_table_new_full(NULL, NULL, NULL,
+                                       (GDestroyNotify) g_source_destroy);
+}
+
+void
+vug_deinit(VugDev *dev)
+{
+    g_assert(dev);
+
+    g_hash_table_unref(dev->fdmap);
+}
diff --git a/contrib/libvhost-user/Makefile.objs 
b/contrib/libvhost-user/Makefile.objs
index cef1ad6e31..ef3778edd4 100644
--- a/contrib/libvhost-user/Makefile.objs
+++ b/contrib/libvhost-user/Makefile.objs
@@ -1 +1 @@
-libvhost-user-obj-y = libvhost-user.o
+libvhost-user-obj-y += libvhost-user.o libvhost-user-glib.o
-- 
2.14.1.146.gd35faa819