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/*
* Copyright (c) 2018 Citrix Systems Inc.
*
* 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 "qemu/error-report.h"
#include "qapi/error.h"
#include "hw/xen/xen-backend.h"
#include "hw/xen/xen-bus.h"
typedef struct XenBackendImpl {
const char *type;
XenBackendDeviceCreate create;
XenBackendDeviceDestroy destroy;
} XenBackendImpl;
struct XenBackendInstance {
QLIST_ENTRY(XenBackendInstance) entry;
const XenBackendImpl *impl;
XenBus *xenbus;
char *name;
XenDevice *xendev;
};
static GHashTable *xen_backend_table_get(void)
{
static GHashTable *table;
if (table == NULL) {
table = g_hash_table_new(g_str_hash, g_str_equal);
}
return table;
}
static void xen_backend_table_add(XenBackendImpl *impl)
{
g_hash_table_insert(xen_backend_table_get(), (void *)impl->type, impl);
}
static const XenBackendImpl *xen_backend_table_lookup(const char *type)
{
return g_hash_table_lookup(xen_backend_table_get(), type);
}
void xen_backend_register(const XenBackendInfo *info)
{
XenBackendImpl *impl = g_new0(XenBackendImpl, 1);
g_assert(info->type);
if (xen_backend_table_lookup(info->type)) {
error_report("attempt to register duplicate Xen backend type '%s'",
info->type);
abort();
}
if (!info->create) {
error_report("backend type '%s' has no creator", info->type);
abort();
}
impl->type = info->type;
impl->create = info->create;
impl->destroy = info->destroy;
xen_backend_table_add(impl);
}
static QLIST_HEAD(, XenBackendInstance) backend_list;
static void xen_backend_list_add(XenBackendInstance *backend)
{
QLIST_INSERT_HEAD(&backend_list, backend, entry);
}
static XenBackendInstance *xen_backend_list_find(XenDevice *xendev)
{
XenBackendInstance *backend;
QLIST_FOREACH(backend, &backend_list, entry) {
if (backend->xendev == xendev) {
return backend;
}
}
return NULL;
}
static void xen_backend_list_remove(XenBackendInstance *backend)
{
QLIST_REMOVE(backend, entry);
}
void xen_backend_device_create(XenBus *xenbus, const char *type,
const char *name, QDict *opts, Error **errp)
{
ERRP_GUARD();
const XenBackendImpl *impl = xen_backend_table_lookup(type);
XenBackendInstance *backend;
if (!impl) {
return;
}
backend = g_new0(XenBackendInstance, 1);
backend->xenbus = xenbus;
backend->name = g_strdup(name);
impl->create(backend, opts, errp);
if (*errp) {
g_free(backend->name);
g_free(backend);
return;
}
backend->impl = impl;
xen_backend_list_add(backend);
}
XenBus *xen_backend_get_bus(XenBackendInstance *backend)
{
return backend->xenbus;
}
const char *xen_backend_get_name(XenBackendInstance *backend)
{
return backend->name;
}
void xen_backend_set_device(XenBackendInstance *backend,
XenDevice *xendev)
{
g_assert(!backend->xendev);
backend->xendev = xendev;
}
XenDevice *xen_backend_get_device(XenBackendInstance *backend)
{
return backend->xendev;
}
bool xen_backend_try_device_destroy(XenDevice *xendev, Error **errp)
{
XenBackendInstance *backend = xen_backend_list_find(xendev);
const XenBackendImpl *impl;
if (!backend) {
return false;
}
impl = backend->impl;
impl->destroy(backend, errp);
xen_backend_list_remove(backend);
g_free(backend->name);
g_free(backend);
return true;
}
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