accel/accel.c

   1 /*
   2  * QEMU System Emulator, accelerator interfaces
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  * Copyright (c) 2014 Red Hat Inc.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25
  26 #include "qemu/osdep.h"
  27 #include "sysemu/accel.h"
  28 #include "hw/boards.h"
  29 #include "sysemu/arch_init.h"
  30 #include "sysemu/sysemu.h"
  31 #include "sysemu/kvm.h"
  32 #include "sysemu/qtest.h"
  33 #include "hw/xen/xen.h"
  34 #include "qom/object.h"
  35 #include "qemu/error-report.h"
  36 #include "qemu/option.h"
  37
  38 static const TypeInfo accel_type = {
  39     .name = TYPE_ACCEL,
  40     .parent = TYPE_OBJECT,
  41     .class_size = sizeof(AccelClass),
  42     .instance_size = sizeof(AccelState),
  43 };
  44
  45 /* Lookup AccelClass from opt_name. Returns NULL if not found */
  46 static AccelClass *accel_find(const char *opt_name)
  47 {
  48     char *class_name = g_strdup_printf(ACCEL_CLASS_NAME("%s"), opt_name);
  49     AccelClass *ac = ACCEL_CLASS(object_class_by_name(class_name));
  50     g_free(class_name);
  51     return ac;
  52 }
  53
  54 static int accel_init_machine(AccelClass *acc, MachineState *ms)
  55 {
  56     ObjectClass *oc = OBJECT_CLASS(acc);
  57     const char *cname = object_class_get_name(oc);
  58     AccelState *accel = ACCEL(object_new(cname));
  59     int ret;
  60     ms->accelerator = accel;
  61     *(acc->allowed) = true;
  62     ret = acc->init_machine(ms);
  63     if (ret < 0) {
  64         ms->accelerator = NULL;
  65         *(acc->allowed) = false;
  66         object_unref(OBJECT(accel));
  67     }
  68     return ret;
  69 }
  70
  71 void configure_accelerator(MachineState *ms)
  72 {
  73     const char *accel;
  74     char **accel_list, **tmp;
  75     int ret;
  76     bool accel_initialised = false;
  77     bool init_failed = false;
  78     AccelClass *acc = NULL;
  79
  80     accel = qemu_opt_get(qemu_get_machine_opts(), "accel");
  81     if (accel == NULL) {
  82         /* Use the default "accelerator", tcg */
  83         accel = "tcg";
  84     }
  85
  86     accel_list = g_strsplit(accel, ":", 0);
  87
  88     for (tmp = accel_list; !accel_initialised && tmp && *tmp; tmp++) {
  89         acc = accel_find(*tmp);
  90         if (!acc) {
  91             continue;
  92         }
  93         if (acc->available && !acc->available()) {
  94             printf("%s not supported for this target\n",
  95                    acc->name);
  96             continue;
  97         }
  98         ret = accel_init_machine(acc, ms);
  99         if (ret < 0) {
 100             init_failed = true;
 101             error_report("failed to initialize %s: %s",
 102                          acc->name, strerror(-ret));
 103         } else {
 104             accel_initialised = true;
 105         }
 106     }
 107     g_strfreev(accel_list);
 108
 109     if (!accel_initialised) {
 110         if (!init_failed) {
 111             error_report("-machine accel=%s: No accelerator found", accel);
 112         }
 113         exit(1);
 114     }
 115
 116     if (init_failed) {
 117         error_report("Back to %s accelerator", acc->name);
 118     }
 119 }
 120
 121 void accel_register_compat_props(AccelState *accel)
 122 {
 123     AccelClass *class = ACCEL_GET_CLASS(accel);
 124     register_compat_props_array(class->global_props);
 125 }
 126
 127 void accel_setup_post(MachineState *ms)
 128 {
 129     AccelState *accel = ms->accelerator;
 130     AccelClass *acc = ACCEL_GET_CLASS(accel);
 131     if (acc->setup_post) {
 132         acc->setup_post(ms, accel);
 133     }
 134 }
 135
 136 static void register_accel_types(void)
 137 {
 138     type_register_static(&accel_type);
 139 }
 140
 141 type_init(register_accel_types);