backends: Add TPM files into their own directory

As we will have various TPM backend files, it is cleaner
to use a single directory.

Suggested-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Message-id: 20200612085444.8362-3-philmd@redhat.com
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>

backends/tpm/tpm_backend.c

@@ -0,0 +1,208 @@
+/*
+ * QEMU TPM Backend
+ *
+ * Copyright IBM, Corp. 2013
+ *
+ * Authors:
+ *  Stefan Berger   <stefanb@us.ibm.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.
+ *
+ * Based on backends/rng.c by Anthony Liguori
+ */
+
+#include "qemu/osdep.h"
+#include "sysemu/tpm_backend.h"
+#include "qapi/error.h"
+#include "sysemu/tpm.h"
+#include "qemu/thread.h"
+#include "qemu/main-loop.h"
+#include "qemu/module.h"
+#include "block/thread-pool.h"
+#include "qemu/error-report.h"
+
+static void tpm_backend_request_completed(void *opaque, int ret)
+{
+    TPMBackend *s = TPM_BACKEND(opaque);
+    TPMIfClass *tic = TPM_IF_GET_CLASS(s->tpmif);
+
+    tic->request_completed(s->tpmif, ret);
+
+    /* no need for atomic, as long the BQL is taken */
+    s->cmd = NULL;
+    object_unref(OBJECT(s));
+}
+
+static int tpm_backend_worker_thread(gpointer data)
+{
+    TPMBackend *s = TPM_BACKEND(data);
+    TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
+    Error *err = NULL;
+
+    k->handle_request(s, s->cmd, &err);
+    if (err) {
+        error_report_err(err);
+        return -1;
+    }
+
+    return 0;
+}
+
+void tpm_backend_finish_sync(TPMBackend *s)
+{
+    while (s->cmd) {
+        aio_poll(qemu_get_aio_context(), true);
+    }
+}
+
+enum TpmType tpm_backend_get_type(TPMBackend *s)
+{
+    TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
+
+    return k->type;
+}
+
+int tpm_backend_init(TPMBackend *s, TPMIf *tpmif, Error **errp)
+{
+    if (s->tpmif) {
+        error_setg(errp, "TPM backend '%s' is already initialized", s->id);
+        return -1;
+    }
+
+    s->tpmif = tpmif;
+    object_ref(OBJECT(tpmif));
+
+    s->had_startup_error = false;
+
+    return 0;
+}
+
+int tpm_backend_startup_tpm(TPMBackend *s, size_t buffersize)
+{
+    int res = 0;
+    TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
+
+    /* terminate a running TPM */
+    tpm_backend_finish_sync(s);
+
+    res = k->startup_tpm ? k->startup_tpm(s, buffersize) : 0;
+
+    s->had_startup_error = (res != 0);
+
+    return res;
+}
+
+bool tpm_backend_had_startup_error(TPMBackend *s)
+{
+    return s->had_startup_error;
+}
+
+void tpm_backend_deliver_request(TPMBackend *s, TPMBackendCmd *cmd)
+{
+    ThreadPool *pool = aio_get_thread_pool(qemu_get_aio_context());
+
+    if (s->cmd != NULL) {
+        error_report("There is a TPM request pending");
+        return;
+    }
+
+    s->cmd = cmd;
+    object_ref(OBJECT(s));
+    thread_pool_submit_aio(pool, tpm_backend_worker_thread, s,
+                           tpm_backend_request_completed, s);
+}
+
+void tpm_backend_reset(TPMBackend *s)
+{
+    TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
+
+    if (k->reset) {
+        k->reset(s);
+    }
+
+    tpm_backend_finish_sync(s);
+
+    s->had_startup_error = false;
+}
+
+void tpm_backend_cancel_cmd(TPMBackend *s)
+{
+    TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
+
+    k->cancel_cmd(s);
+}
+
+bool tpm_backend_get_tpm_established_flag(TPMBackend *s)
+{
+    TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
+
+    return k->get_tpm_established_flag ?
+           k->get_tpm_established_flag(s) : false;
+}
+
+int tpm_backend_reset_tpm_established_flag(TPMBackend *s, uint8_t locty)
+{
+    TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
+
+    return k->reset_tpm_established_flag ?
+           k->reset_tpm_established_flag(s, locty) : 0;
+}
+
+TPMVersion tpm_backend_get_tpm_version(TPMBackend *s)
+{
+    TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
+
+    return k->get_tpm_version(s);
+}
+
+size_t tpm_backend_get_buffer_size(TPMBackend *s)
+{
+    TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
+
+    return k->get_buffer_size(s);
+}
+
+TPMInfo *tpm_backend_query_tpm(TPMBackend *s)
+{
+    TPMInfo *info = g_new0(TPMInfo, 1);
+    TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
+    TPMIfClass *tic = TPM_IF_GET_CLASS(s->tpmif);
+
+    info->id = g_strdup(s->id);
+    info->model = tic->model;
+    info->options = k->get_tpm_options(s);
+
+    return info;
+}
+
+static void tpm_backend_instance_finalize(Object *obj)
+{
+    TPMBackend *s = TPM_BACKEND(obj);
+
+    object_unref(OBJECT(s->tpmif));
+    g_free(s->id);
+}
+
+static const TypeInfo tpm_backend_info = {
+    .name = TYPE_TPM_BACKEND,
+    .parent = TYPE_OBJECT,
+    .instance_size = sizeof(TPMBackend),
+    .instance_finalize = tpm_backend_instance_finalize,
+    .class_size = sizeof(TPMBackendClass),
+    .abstract = true,
+};
+
+static const TypeInfo tpm_if_info = {
+    .name = TYPE_TPM_IF,
+    .parent = TYPE_INTERFACE,
+    .class_size = sizeof(TPMIfClass),
+};
+
+static void register_types(void)
+{
+    type_register_static(&tpm_backend_info);
+    type_register_static(&tpm_if_info);
+}
+
+type_init(register_types);