blob: 5b0fb76eaeb38106f35ceac2830b1375f434b81e [file] [log] [blame]
Paul Durranta783f8a2019-01-08 14:49:00 +00001/*
2 * Copyright (c) 2018 Citrix Systems Inc.
3 *
4 * This work is licensed under the terms of the GNU GPL, version 2 or later.
5 * See the COPYING file in the top-level directory.
6 */
7
8#include "qemu/osdep.h"
9#include "qemu/error-report.h"
10#include "qapi/error.h"
11#include "hw/xen/xen-backend.h"
12#include "hw/xen/xen-bus.h"
13
14typedef struct XenBackendImpl {
15 const char *type;
16 XenBackendDeviceCreate create;
17 XenBackendDeviceDestroy destroy;
18} XenBackendImpl;
19
20struct XenBackendInstance {
21 QLIST_ENTRY(XenBackendInstance) entry;
22 const XenBackendImpl *impl;
23 XenBus *xenbus;
24 char *name;
25 XenDevice *xendev;
26};
27
28static GHashTable *xen_backend_table_get(void)
29{
30 static GHashTable *table;
31
32 if (table == NULL) {
33 table = g_hash_table_new(g_str_hash, g_str_equal);
34 }
35
36 return table;
37}
38
39static void xen_backend_table_add(XenBackendImpl *impl)
40{
41 g_hash_table_insert(xen_backend_table_get(), (void *)impl->type, impl);
42}
43
Paul Durrantc4583c82020-10-01 09:15:00 +010044static const char **xen_backend_table_keys(unsigned int *count)
45{
46 return (const char **)g_hash_table_get_keys_as_array(
47 xen_backend_table_get(), count);
48}
49
Paul Durranta783f8a2019-01-08 14:49:00 +000050static const XenBackendImpl *xen_backend_table_lookup(const char *type)
51{
52 return g_hash_table_lookup(xen_backend_table_get(), type);
53}
54
55void xen_backend_register(const XenBackendInfo *info)
56{
57 XenBackendImpl *impl = g_new0(XenBackendImpl, 1);
58
59 g_assert(info->type);
60
61 if (xen_backend_table_lookup(info->type)) {
62 error_report("attempt to register duplicate Xen backend type '%s'",
63 info->type);
64 abort();
65 }
66
67 if (!info->create) {
68 error_report("backend type '%s' has no creator", info->type);
69 abort();
70 }
71
72 impl->type = info->type;
73 impl->create = info->create;
74 impl->destroy = info->destroy;
75
76 xen_backend_table_add(impl);
77}
78
Paul Durrantc4583c82020-10-01 09:15:00 +010079const char **xen_backend_get_types(unsigned int *count)
80{
81 return xen_backend_table_keys(count);
82}
83
Paul Durranta783f8a2019-01-08 14:49:00 +000084static QLIST_HEAD(, XenBackendInstance) backend_list;
85
86static void xen_backend_list_add(XenBackendInstance *backend)
87{
88 QLIST_INSERT_HEAD(&backend_list, backend, entry);
89}
90
91static XenBackendInstance *xen_backend_list_find(XenDevice *xendev)
92{
93 XenBackendInstance *backend;
94
95 QLIST_FOREACH(backend, &backend_list, entry) {
96 if (backend->xendev == xendev) {
97 return backend;
98 }
99 }
100
101 return NULL;
102}
103
104static void xen_backend_list_remove(XenBackendInstance *backend)
105{
106 QLIST_REMOVE(backend, entry);
107}
108
109void xen_backend_device_create(XenBus *xenbus, const char *type,
110 const char *name, QDict *opts, Error **errp)
111{
Vladimir Sementsov-Ogievskiy1de70962020-07-07 18:50:37 +0200112 ERRP_GUARD();
Paul Durranta783f8a2019-01-08 14:49:00 +0000113 const XenBackendImpl *impl = xen_backend_table_lookup(type);
114 XenBackendInstance *backend;
Paul Durranta783f8a2019-01-08 14:49:00 +0000115
116 if (!impl) {
117 return;
118 }
119
120 backend = g_new0(XenBackendInstance, 1);
121 backend->xenbus = xenbus;
122 backend->name = g_strdup(name);
123
Vladimir Sementsov-Ogievskiy1de70962020-07-07 18:50:37 +0200124 impl->create(backend, opts, errp);
125 if (*errp) {
Paul Durranta783f8a2019-01-08 14:49:00 +0000126 g_free(backend->name);
127 g_free(backend);
128 return;
129 }
130
131 backend->impl = impl;
132 xen_backend_list_add(backend);
133}
134
135XenBus *xen_backend_get_bus(XenBackendInstance *backend)
136{
137 return backend->xenbus;
138}
139
140const char *xen_backend_get_name(XenBackendInstance *backend)
141{
142 return backend->name;
143}
144
145void xen_backend_set_device(XenBackendInstance *backend,
146 XenDevice *xendev)
147{
148 g_assert(!backend->xendev);
149 backend->xendev = xendev;
150}
151
152XenDevice *xen_backend_get_device(XenBackendInstance *backend)
153{
154 return backend->xendev;
155}
156
157
158bool xen_backend_try_device_destroy(XenDevice *xendev, Error **errp)
159{
160 XenBackendInstance *backend = xen_backend_list_find(xendev);
161 const XenBackendImpl *impl;
162
163 if (!backend) {
164 return false;
165 }
166
167 impl = backend->impl;
168 impl->destroy(backend, errp);
169
170 xen_backend_list_remove(backend);
171 g_free(backend->name);
172 g_free(backend);
173
174 return true;
175}