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