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