8bb7ddb78a
This file implements a bridge from the vu_init API of libvhost-user to GSource, so that libvhost-user can be used inside a GLib main loop. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
155 lines
3.3 KiB
C
155 lines
3.3 KiB
C
/*
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* Vhost User library
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*
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* Copyright (c) 2016 Nutanix Inc. All rights reserved.
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* Copyright (c) 2017 Red Hat, Inc.
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*
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* Authors:
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* Marc-André Lureau <mlureau@redhat.com>
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* Felipe Franciosi <felipe@nutanix.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* later. See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "libvhost-user-glib.h"
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/* glib event loop integration for libvhost-user and misc callbacks */
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G_STATIC_ASSERT((int)G_IO_IN == (int)VU_WATCH_IN);
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G_STATIC_ASSERT((int)G_IO_OUT == (int)VU_WATCH_OUT);
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G_STATIC_ASSERT((int)G_IO_PRI == (int)VU_WATCH_PRI);
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G_STATIC_ASSERT((int)G_IO_ERR == (int)VU_WATCH_ERR);
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G_STATIC_ASSERT((int)G_IO_HUP == (int)VU_WATCH_HUP);
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typedef struct VugSrc {
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GSource parent;
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VuDev *dev;
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GPollFD gfd;
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} VugSrc;
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static gboolean
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vug_src_prepare(GSource *gsrc, gint *timeout)
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{
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g_assert(timeout);
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*timeout = -1;
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return FALSE;
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}
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static gboolean
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vug_src_check(GSource *gsrc)
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{
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VugSrc *src = (VugSrc *)gsrc;
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g_assert(src);
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return src->gfd.revents & src->gfd.events;
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}
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static gboolean
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vug_src_dispatch(GSource *gsrc, GSourceFunc cb, gpointer data)
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{
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VugSrc *src = (VugSrc *)gsrc;
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g_assert(src);
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((vu_watch_cb)cb)(src->dev, src->gfd.revents, data);
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return G_SOURCE_CONTINUE;
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}
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static GSourceFuncs vug_src_funcs = {
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vug_src_prepare,
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vug_src_check,
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vug_src_dispatch,
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NULL
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};
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static GSource *
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vug_source_new(VuDev *dev, int fd, GIOCondition cond,
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vu_watch_cb vu_cb, gpointer data)
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{
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GSource *gsrc;
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VugSrc *src;
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guint id;
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g_assert(dev);
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g_assert(fd >= 0);
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g_assert(vu_cb);
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gsrc = g_source_new(&vug_src_funcs, sizeof(VugSrc));
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g_source_set_callback(gsrc, (GSourceFunc)vu_cb, data, NULL);
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src = (VugSrc *)gsrc;
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src->dev = dev;
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src->gfd.fd = fd;
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src->gfd.events = cond;
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g_source_add_poll(gsrc, &src->gfd);
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id = g_source_attach(gsrc, NULL);
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g_assert(id);
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g_source_unref(gsrc);
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return gsrc;
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}
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static void
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set_watch(VuDev *vu_dev, int fd, int vu_evt, vu_watch_cb cb, void *pvt)
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{
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GSource *src;
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VugDev *dev;
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g_assert(vu_dev);
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g_assert(fd >= 0);
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g_assert(cb);
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dev = container_of(vu_dev, VugDev, parent);
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src = vug_source_new(vu_dev, fd, vu_evt, cb, pvt);
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g_hash_table_replace(dev->fdmap, GINT_TO_POINTER(fd), src);
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}
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static void
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remove_watch(VuDev *vu_dev, int fd)
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{
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VugDev *dev;
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g_assert(vu_dev);
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g_assert(fd >= 0);
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dev = container_of(vu_dev, VugDev, parent);
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g_hash_table_remove(dev->fdmap, GINT_TO_POINTER(fd));
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}
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static void vug_watch(VuDev *dev, int condition, void *data)
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{
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if (!vu_dispatch(dev) != 0) {
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dev->panic(dev, "Error processing vhost message");
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}
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}
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void
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vug_init(VugDev *dev, int socket,
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vu_panic_cb panic, const VuDevIface *iface)
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{
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g_assert(dev);
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g_assert(iface);
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vu_init(&dev->parent, socket, panic, set_watch, remove_watch, iface);
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dev->fdmap = g_hash_table_new_full(NULL, NULL, NULL,
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(GDestroyNotify) g_source_destroy);
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dev->src = vug_source_new(&dev->parent, socket, G_IO_IN, vug_watch, NULL);
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}
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void
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vug_deinit(VugDev *dev)
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{
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g_assert(dev);
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g_hash_table_unref(dev->fdmap);
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g_source_unref(dev->src);
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}
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