176 lines
3.8 KiB
C
176 lines
3.8 KiB
C
/*
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* Copyright (c) 2018 Citrix Systems Inc.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* 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 "qemu/error-report.h"
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#include "qapi/error.h"
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#include "hw/xen/xen-backend.h"
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#include "hw/xen/xen-bus.h"
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typedef struct XenBackendImpl {
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const char *type;
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XenBackendDeviceCreate create;
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XenBackendDeviceDestroy destroy;
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} XenBackendImpl;
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struct XenBackendInstance {
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QLIST_ENTRY(XenBackendInstance) entry;
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const XenBackendImpl *impl;
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XenBus *xenbus;
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char *name;
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XenDevice *xendev;
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};
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static GHashTable *xen_backend_table_get(void)
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{
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static GHashTable *table;
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if (table == NULL) {
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table = g_hash_table_new(g_str_hash, g_str_equal);
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}
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return table;
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}
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static void xen_backend_table_add(XenBackendImpl *impl)
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{
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g_hash_table_insert(xen_backend_table_get(), (void *)impl->type, impl);
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}
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static const char **xen_backend_table_keys(unsigned int *count)
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{
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return (const char **)g_hash_table_get_keys_as_array(
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xen_backend_table_get(), count);
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}
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static const XenBackendImpl *xen_backend_table_lookup(const char *type)
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{
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return g_hash_table_lookup(xen_backend_table_get(), type);
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}
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void xen_backend_register(const XenBackendInfo *info)
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{
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XenBackendImpl *impl = g_new0(XenBackendImpl, 1);
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g_assert(info->type);
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if (xen_backend_table_lookup(info->type)) {
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error_report("attempt to register duplicate Xen backend type '%s'",
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info->type);
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abort();
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}
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if (!info->create) {
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error_report("backend type '%s' has no creator", info->type);
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abort();
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}
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impl->type = info->type;
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impl->create = info->create;
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impl->destroy = info->destroy;
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xen_backend_table_add(impl);
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}
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const char **xen_backend_get_types(unsigned int *count)
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{
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return xen_backend_table_keys(count);
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}
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static QLIST_HEAD(, XenBackendInstance) backend_list;
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static void xen_backend_list_add(XenBackendInstance *backend)
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{
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QLIST_INSERT_HEAD(&backend_list, backend, entry);
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}
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static XenBackendInstance *xen_backend_list_find(XenDevice *xendev)
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{
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XenBackendInstance *backend;
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QLIST_FOREACH(backend, &backend_list, entry) {
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if (backend->xendev == xendev) {
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return backend;
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}
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}
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return NULL;
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}
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static void xen_backend_list_remove(XenBackendInstance *backend)
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{
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QLIST_REMOVE(backend, entry);
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}
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void xen_backend_device_create(XenBus *xenbus, const char *type,
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const char *name, QDict *opts, Error **errp)
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{
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ERRP_GUARD();
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const XenBackendImpl *impl = xen_backend_table_lookup(type);
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XenBackendInstance *backend;
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if (!impl) {
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return;
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}
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backend = g_new0(XenBackendInstance, 1);
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backend->xenbus = xenbus;
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backend->name = g_strdup(name);
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impl->create(backend, opts, errp);
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if (*errp) {
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g_free(backend->name);
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g_free(backend);
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return;
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}
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backend->impl = impl;
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xen_backend_list_add(backend);
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}
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XenBus *xen_backend_get_bus(XenBackendInstance *backend)
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{
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return backend->xenbus;
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}
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const char *xen_backend_get_name(XenBackendInstance *backend)
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{
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return backend->name;
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}
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void xen_backend_set_device(XenBackendInstance *backend,
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XenDevice *xendev)
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{
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g_assert(!backend->xendev);
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backend->xendev = xendev;
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}
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XenDevice *xen_backend_get_device(XenBackendInstance *backend)
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{
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return backend->xendev;
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}
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bool xen_backend_try_device_destroy(XenDevice *xendev, Error **errp)
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{
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XenBackendInstance *backend = xen_backend_list_find(xendev);
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const XenBackendImpl *impl;
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if (!backend) {
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return false;
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}
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impl = backend->impl;
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impl->destroy(backend, errp);
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xen_backend_list_remove(backend);
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g_free(backend->name);
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g_free(backend);
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return true;
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}
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