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/*
* Virtio Shared dma-buf
*
* Copyright Red Hat, Inc. 2023
*
* Authors:
* Albert Esteve <aesteve@redhat.com>
*
* 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 "hw/virtio/virtio-dmabuf.h"
static GMutex lock;
static GHashTable *resource_uuids;
/*
* uuid_equal_func: wrapper for UUID is_equal function to
* satisfy g_hash_table_new expected parameters signatures.
*/
static int uuid_equal_func(const void *lhv, const void *rhv)
{
return qemu_uuid_is_equal(lhv, rhv);
}
static bool virtio_add_resource(QemuUUID *uuid, VirtioSharedObject *value)
{
bool result = false;
g_mutex_lock(&lock);
if (resource_uuids == NULL) {
resource_uuids = g_hash_table_new_full(qemu_uuid_hash,
uuid_equal_func,
NULL,
g_free);
}
if (g_hash_table_lookup(resource_uuids, uuid) == NULL) {
result = g_hash_table_insert(resource_uuids, uuid, value);
}
g_mutex_unlock(&lock);
return result;
}
bool virtio_add_dmabuf(QemuUUID *uuid, int udmabuf_fd)
{
bool result;
VirtioSharedObject *vso;
if (udmabuf_fd < 0) {
return false;
}
vso = g_new(VirtioSharedObject, 1);
vso->type = TYPE_DMABUF;
vso->value = GINT_TO_POINTER(udmabuf_fd);
result = virtio_add_resource(uuid, vso);
return result;
}
bool virtio_add_vhost_device(QemuUUID *uuid, struct vhost_dev *dev)
{
bool result;
VirtioSharedObject *vso;
if (dev == NULL) {
return false;
}
vso = g_new(VirtioSharedObject, 1);
vso->type = TYPE_VHOST_DEV;
vso->value = dev;
result = virtio_add_resource(uuid, vso);
return result;
}
bool virtio_remove_resource(const QemuUUID *uuid)
{
bool result;
g_mutex_lock(&lock);
result = g_hash_table_remove(resource_uuids, uuid);
g_mutex_unlock(&lock);
return result;
}
static VirtioSharedObject *get_shared_object(const QemuUUID *uuid)
{
gpointer lookup_res = NULL;
g_mutex_lock(&lock);
if (resource_uuids != NULL) {
lookup_res = g_hash_table_lookup(resource_uuids, uuid);
}
g_mutex_unlock(&lock);
return (VirtioSharedObject *) lookup_res;
}
int virtio_lookup_dmabuf(const QemuUUID *uuid)
{
VirtioSharedObject *vso = get_shared_object(uuid);
if (vso == NULL) {
return -1;
}
assert(vso->type == TYPE_DMABUF);
return GPOINTER_TO_INT(vso->value);
}
struct vhost_dev *virtio_lookup_vhost_device(const QemuUUID *uuid)
{
VirtioSharedObject *vso = get_shared_object(uuid);
if (vso == NULL) {
return NULL;
}
assert(vso->type == TYPE_VHOST_DEV);
return (struct vhost_dev *) vso->value;
}
SharedObjectType virtio_object_type(const QemuUUID *uuid)
{
VirtioSharedObject *vso = get_shared_object(uuid);
if (vso == NULL) {
return TYPE_INVALID;
}
return vso->type;
}
void virtio_free_resources(void)
{
g_mutex_lock(&lock);
g_hash_table_destroy(resource_uuids);
/* Reference count shall be 0 after the implicit unref on destroy */
resource_uuids = NULL;
g_mutex_unlock(&lock);
}
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