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
  37int tcg_tb_size;
  38static bool tcg_allowed = true;
  39
  40static int tcg_init(MachineState *ms)
  41{
  42    tcg_exec_init(tcg_tb_size * 1024 * 1024);
  43    return 0;
  44}
  45
  46static 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 */
  54static 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
  62static 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
  79void 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
 133static 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
 143static const TypeInfo tcg_accel_type = {
 144    .name = TYPE_TCG_ACCEL,
 145    .parent = TYPE_ACCEL,
 146    .class_init = tcg_accel_class_init,
 147};
 148
 149static void register_accel_types(void)
 150{
 151    type_register_static(&accel_type);
 152    type_register_static(&tcg_accel_type);
 153}
 154
 155type_init(register_accel_types);
 156