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 "qemu-common.h"
  30 #include "sysemu/arch_init.h"
  31 #include "sysemu/sysemu.h"
  32 #include "sysemu/kvm.h"
  33 #include "sysemu/qtest.h"
  34 #include "hw/xen/xen.h"
  35 #include "qom/object.h"
  36
  37 int tcg_tb_size;
  38 static bool tcg_allowed = true;
  39
  40 static int tcg_init(MachineState *ms)
  41 {
  42     tcg_exec_init(tcg_tb_size * 1024 * 1024);
  43     return 0;
  44 }
  45
  46 static const TypeInfo accel_type = {
  47     .name = TYPE_ACCEL,
  48     .parent = TYPE_OBJECT,
  49     .class_size = sizeof(AccelClass),
  50     .instance_size = sizeof(AccelState),
  51 };
  52
  53 /* Lookup AccelClass from opt_name. Returns NULL if not found */
  54 static AccelClass *accel_find(const char *opt_name)
  55 {
  56     char *class_name = g_strdup_printf(ACCEL_CLASS_NAME("%s"), opt_name);
  57     AccelClass *ac = ACCEL_CLASS(object_class_by_name(class_name));
  58     g_free(class_name);
  59     return ac;
  60 }
  61
  62 static int accel_init_machine(AccelClass *acc, MachineState *ms)
  63 {
  64     ObjectClass *oc = OBJECT_CLASS(acc);
  65     const char *cname = object_class_get_name(oc);
  66     AccelState *accel = ACCEL(object_new(cname));
  67     int ret;
  68     ms->accelerator = accel;
  69     *(acc->allowed) = true;
  70     ret = acc->init_machine(ms);
  71     if (ret < 0) {
  72         ms->accelerator = NULL;
  73         *(acc->allowed) = false;
  74         object_unref(OBJECT(accel));
  75     }
  76     return ret;
  77 }
  78
  79 void configure_accelerator(MachineState *ms)
  80 {
  81     const char *p;
  82     char buf[10];
  83     int ret;
  84     bool accel_initialised = false;
  85     bool init_failed = false;
  86     AccelClass *acc = NULL;
  87
  88     p = qemu_opt_get(qemu_get_machine_opts(), "accel");
  89     if (p == NULL) {
  90         /* Use the default "accelerator", tcg */
  91         p = "tcg";
  92     }
  93
  94     while (!accel_initialised && *p != '\0') {
  95         if (*p == ':') {
  96             p++;
  97         }
  98         p = get_opt_name(buf, sizeof(buf), p, ':');
  99         acc = accel_find(buf);
 100         if (!acc) {
 101             fprintf(stderr, "\"%s\" accelerator not found.\n", buf);
 102             continue;
 103         }
 104         if (acc->available && !acc->available()) {
 105             printf("%s not supported for this target\n",
 106                    acc->name);
 107             continue;
 108         }
 109         ret = accel_init_machine(acc, ms);
 110         if (ret < 0) {
 111             init_failed = true;
 112             fprintf(stderr, "failed to initialize %s: %s\n",
 113                     acc->name,
 114                     strerror(-ret));
 115         } else {
 116             accel_initialised = true;
 117         }
 118     }
 119
 120     if (!accel_initialised) {
 121         if (!init_failed) {
 122             fprintf(stderr, "No accelerator found!\n");
 123         }
 124         exit(1);
 125     }
 126
 127     if (init_failed) {
 128         fprintf(stderr, "Back to %s accelerator.\n", acc->name);
 129     }
 130 }
 131
 132
 133 static void tcg_accel_class_init(ObjectClass *oc, void *data)
 134 {
 135     AccelClass *ac = ACCEL_CLASS(oc);
 136     ac->name = "tcg";
 137     ac->init_machine = tcg_init;
 138     ac->allowed = &tcg_allowed;
 139 }
 140
 141 #define TYPE_TCG_ACCEL ACCEL_CLASS_NAME("tcg")
 142
 143 static const TypeInfo tcg_accel_type = {
 144     .name = TYPE_TCG_ACCEL,
 145     .parent = TYPE_ACCEL,
 146     .class_init = tcg_accel_class_init,
 147 };
 148
 149 static void register_accel_types(void)
 150 {
 151     type_register_static(&accel_type);
 152     type_register_static(&tcg_accel_type);
 153 }
 154
 155 type_init(register_accel_types);