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