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