LXR qemu/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
  38int tcg_tb_size;
  39static bool tcg_allowed = true;
  40
  41static int tcg_init(MachineState *ms)
  42{
  43    tcg_exec_init(tcg_tb_size * 1024 * 1024);
  44    return 0;
  45}
  46
  47static 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 */
  55static 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
  63static 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
  80void 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
 134static 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
 144static const TypeInfo tcg_accel_type = {
 145    .name = TYPE_TCG_ACCEL,
 146    .parent = TYPE_ACCEL,
 147    .class_init = tcg_accel_class_init,
 148};
 149
 150static void register_accel_types(void)
 151{
 152    type_register_static(&accel_type);
 153    type_register_static(&tcg_accel_type);
 154}
 155
 156type_init(register_accel_types);
 157