4 * Copyright IBM, Corp. 2013
9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
10 * See the COPYING file in the top-level directory.
12 * Based on backends/rng.c by Anthony Liguori
15 #include "qemu/osdep.h"
16 #include "sysemu/tpm_backend.h"
17 #include "qapi/error.h"
18 #include "sysemu/tpm.h"
19 #include "qemu/thread.h"
20 #include "qemu/main-loop.h"
21 #include "qemu/module.h"
22 #include "block/thread-pool.h"
23 #include "qemu/error-report.h"
25 static void tpm_backend_request_completed(void *opaque, int ret)
27 TPMBackend *s = TPM_BACKEND(opaque);
28 TPMIfClass *tic = TPM_IF_GET_CLASS(s->tpmif);
30 tic->request_completed(s->tpmif, ret);
32 /* no need for atomic, as long the BQL is taken */
34 object_unref(OBJECT(s));
37 static int tpm_backend_worker_thread(gpointer data)
39 TPMBackend *s = TPM_BACKEND(data);
40 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
43 k->handle_request(s, s->cmd, &err);
45 error_report_err(err);
52 void tpm_backend_finish_sync(TPMBackend *s)
55 aio_poll(qemu_get_aio_context(), true);
59 enum TpmType tpm_backend_get_type(TPMBackend *s)
61 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
66 int tpm_backend_init(TPMBackend *s, TPMIf *tpmif, Error **errp)
69 error_setg(errp, "TPM backend '%s' is already initialized", s->id);
74 object_ref(OBJECT(tpmif));
76 s->had_startup_error = false;
81 int tpm_backend_startup_tpm(TPMBackend *s, size_t buffersize)
84 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
86 /* terminate a running TPM */
87 tpm_backend_finish_sync(s);
89 res = k->startup_tpm ? k->startup_tpm(s, buffersize) : 0;
91 s->had_startup_error = (res != 0);
96 bool tpm_backend_had_startup_error(TPMBackend *s)
98 return s->had_startup_error;
101 void tpm_backend_deliver_request(TPMBackend *s, TPMBackendCmd *cmd)
103 ThreadPool *pool = aio_get_thread_pool(qemu_get_aio_context());
105 if (s->cmd != NULL) {
106 error_report("There is a TPM request pending");
111 object_ref(OBJECT(s));
112 thread_pool_submit_aio(pool, tpm_backend_worker_thread, s,
113 tpm_backend_request_completed, s);
116 void tpm_backend_reset(TPMBackend *s)
118 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
124 tpm_backend_finish_sync(s);
126 s->had_startup_error = false;
129 void tpm_backend_cancel_cmd(TPMBackend *s)
131 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
136 bool tpm_backend_get_tpm_established_flag(TPMBackend *s)
138 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
140 return k->get_tpm_established_flag ?
141 k->get_tpm_established_flag(s) : false;
144 int tpm_backend_reset_tpm_established_flag(TPMBackend *s, uint8_t locty)
146 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
148 return k->reset_tpm_established_flag ?
149 k->reset_tpm_established_flag(s, locty) : 0;
152 TPMVersion tpm_backend_get_tpm_version(TPMBackend *s)
154 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
156 return k->get_tpm_version(s);
159 size_t tpm_backend_get_buffer_size(TPMBackend *s)
161 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
163 return k->get_buffer_size(s);
166 TPMInfo *tpm_backend_query_tpm(TPMBackend *s)
168 TPMInfo *info = g_new0(TPMInfo, 1);
169 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
170 TPMIfClass *tic = TPM_IF_GET_CLASS(s->tpmif);
172 info->id = g_strdup(s->id);
173 info->model = tic->model;
174 info->options = k->get_tpm_options(s);
179 static void tpm_backend_instance_finalize(Object *obj)
181 TPMBackend *s = TPM_BACKEND(obj);
183 object_unref(OBJECT(s->tpmif));
187 static const TypeInfo tpm_backend_info = {
188 .name = TYPE_TPM_BACKEND,
189 .parent = TYPE_OBJECT,
190 .instance_size = sizeof(TPMBackend),
191 .instance_finalize = tpm_backend_instance_finalize,
192 .class_size = sizeof(TPMBackendClass),
196 static const TypeInfo tpm_if_info = {
198 .parent = TYPE_INTERFACE,
199 .class_size = sizeof(TPMIfClass),
202 static void register_types(void)
204 type_register_static(&tpm_backend_info);
205 type_register_static(&tpm_if_info);
208 type_init(register_types);