LXR qemu/hw/usb/dev-storage-classic.c

   1/*
   2 * USB Mass Storage Device emulation
   3 *
   4 * Copyright (c) 2006 CodeSourcery.
   5 * Written by Paul Brook
   6 *
   7 * This code is licensed under the LGPL.
   8 */
   9
  10#include "qemu/osdep.h"
  11#include "qemu/typedefs.h"
  12#include "qapi/error.h"
  13#include "qapi/visitor.h"
  14#include "hw/usb.h"
  15#include "hw/usb/desc.h"
  16#include "hw/usb/msd.h"
  17#include "sysemu/sysemu.h"
  18#include "sysemu/block-backend.h"
  19
  20static const struct SCSIBusInfo usb_msd_scsi_info_storage = {
  21    .tcq = false,
  22    .max_target = 0,
  23    .max_lun = 0,
  24
  25    .transfer_data = usb_msd_transfer_data,
  26    .complete = usb_msd_command_complete,
  27    .cancel = usb_msd_request_cancelled,
  28    .load_request = usb_msd_load_request,
  29};
  30
  31static void usb_msd_storage_realize(USBDevice *dev, Error **errp)
  32{
  33    MSDState *s = USB_STORAGE_DEV(dev);
  34    BlockBackend *blk = s->conf.blk;
  35    SCSIDevice *scsi_dev;
  36
  37    if (!blk) {
  38        error_setg(errp, "drive property not set");
  39        return;
  40    }
  41
  42    if (!blkconf_blocksizes(&s->conf, errp)) {
  43        return;
  44    }
  45
  46    if (!blkconf_apply_backend_options(&s->conf, !blk_supports_write_perm(blk),
  47                                       true, errp)) {
  48        return;
  49    }
  50
  51    /*
  52     * Hack alert: this pretends to be a block device, but it's really
  53     * a SCSI bus that can serve only a single device, which it
  54     * creates automatically.  But first it needs to detach from its
  55     * blockdev, or else scsi_bus_legacy_add_drive() dies when it
  56     * attaches again. We also need to take another reference so that
  57     * blk_detach_dev() doesn't free blk while we still need it.
  58     *
  59     * The hack is probably a bad idea.
  60     */
  61    blk_ref(blk);
  62    blk_detach_dev(blk, DEVICE(s));
  63    s->conf.blk = NULL;
  64
  65    usb_desc_create_serial(dev);
  66    usb_desc_init(dev);
  67    dev->flags |= (1 << USB_DEV_FLAG_IS_SCSI_STORAGE);
  68    scsi_bus_init(&s->bus, sizeof(s->bus), DEVICE(dev),
  69                 &usb_msd_scsi_info_storage);
  70    scsi_dev = scsi_bus_legacy_add_drive(&s->bus, blk, 0, !!s->removable,
  71                                         s->conf.bootindex, s->conf.share_rw,
  72                                         s->conf.rerror, s->conf.werror,
  73                                         dev->serial,
  74                                         errp);
  75    blk_unref(blk);
  76    if (!scsi_dev) {
  77        return;
  78    }
  79    usb_msd_handle_reset(dev);
  80    s->scsi_dev = scsi_dev;
  81}
  82
  83static Property msd_properties[] = {
  84    DEFINE_BLOCK_PROPERTIES(MSDState, conf),
  85    DEFINE_BLOCK_ERROR_PROPERTIES(MSDState, conf),
  86    DEFINE_PROP_BOOL("removable", MSDState, removable, false),
  87    DEFINE_PROP_BOOL("commandlog", MSDState, commandlog, false),
  88    DEFINE_PROP_END_OF_LIST(),
  89};
  90
  91static void usb_msd_class_storage_initfn(ObjectClass *klass, void *data)
  92{
  93    DeviceClass *dc = DEVICE_CLASS(klass);
  94    USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
  95
  96    uc->realize = usb_msd_storage_realize;
  97    device_class_set_props(dc, msd_properties);
  98}
  99
 100static void usb_msd_get_bootindex(Object *obj, Visitor *v, const char *name,
 101                                  void *opaque, Error **errp)
 102{
 103    USBDevice *dev = USB_DEVICE(obj);
 104    MSDState *s = USB_STORAGE_DEV(dev);
 105
 106    visit_type_int32(v, name, &s->conf.bootindex, errp);
 107}
 108
 109static void usb_msd_set_bootindex(Object *obj, Visitor *v, const char *name,
 110                                  void *opaque, Error **errp)
 111{
 112    USBDevice *dev = USB_DEVICE(obj);
 113    MSDState *s = USB_STORAGE_DEV(dev);
 114    int32_t boot_index;
 115    Error *local_err = NULL;
 116
 117    if (!visit_type_int32(v, name, &boot_index, errp)) {
 118        return;
 119    }
 120    /* check whether bootindex is present in fw_boot_order list  */
 121    check_boot_index(boot_index, &local_err);
 122    if (local_err) {
 123        goto out;
 124    }
 125    /* change bootindex to a new one */
 126    s->conf.bootindex = boot_index;
 127
 128    if (s->scsi_dev) {
 129        object_property_set_int(OBJECT(s->scsi_dev), "bootindex", boot_index,
 130                                &error_abort);
 131    }
 132
 133out:
 134    error_propagate(errp, local_err);
 135}
 136
 137static void usb_msd_instance_init(Object *obj)
 138{
 139    object_property_add(obj, "bootindex", "int32",
 140                        usb_msd_get_bootindex,
 141                        usb_msd_set_bootindex, NULL, NULL);
 142    object_property_set_int(obj, "bootindex", -1, NULL);
 143}
 144
 145static const TypeInfo msd_info = {
 146    .name          = "usb-storage",
 147    .parent        = TYPE_USB_STORAGE,
 148    .class_init    = usb_msd_class_storage_initfn,
 149    .instance_init = usb_msd_instance_init,
 150};
 151
 152static void register_types(void)
 153{
 154    type_register_static(&msd_info);
 155}
 156
 157type_init(register_types)
 158