tpm/tpm_backend.c

   1 /*
   2  *  common TPM backend driver functions
   3  *
   4  *  Copyright (c) 2012-2013 IBM Corporation
   5  *  Authors:
   6  *    Stefan Berger <stefanb@us.ibm.com>
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, see <http://www.gnu.org/licenses/>
  20  */
  21
  22 #include "tpm/tpm.h"
  23 #include "qemu/thread.h"
  24 #include "tpm_backend.h"
  25
  26 void tpm_backend_thread_deliver_request(TPMBackendThread *tbt)
  27 {
  28    g_thread_pool_push(tbt->pool, (gpointer)TPM_BACKEND_CMD_PROCESS_CMD, NULL);
  29 }
  30
  31 void tpm_backend_thread_create(TPMBackendThread *tbt,
  32                                GFunc func, gpointer user_data)
  33 {
  34     if (!tbt->pool) {
  35         tbt->pool = g_thread_pool_new(func, user_data, 1, TRUE, NULL);
  36         g_thread_pool_push(tbt->pool, (gpointer)TPM_BACKEND_CMD_INIT, NULL);
  37     }
  38 }
  39
  40 void tpm_backend_thread_end(TPMBackendThread *tbt)
  41 {
  42     if (tbt->pool) {
  43         g_thread_pool_push(tbt->pool, (gpointer)TPM_BACKEND_CMD_END, NULL);
  44         g_thread_pool_free(tbt->pool, FALSE, TRUE);
  45         tbt->pool = NULL;
  46     }
  47 }
  48
  49 void tpm_backend_thread_tpm_reset(TPMBackendThread *tbt,
  50                                   GFunc func, gpointer user_data)
  51 {
  52     if (!tbt->pool) {
  53         tpm_backend_thread_create(tbt, func, user_data);
  54     } else {
  55         g_thread_pool_push(tbt->pool, (gpointer)TPM_BACKEND_CMD_TPM_RESET,
  56                            NULL);
  57     }
  58 }