/* * USB Mass Storage Device emulation * * Copyright (c) 2006 CodeSourcery. * Written by Paul Brook * * This code is licensed under the LGPL. */ #include "qemu-common.h" #include "qemu/option.h" #include "qemu/config-file.h" #include "hw/usb.h" #include "hw/usb/desc.h" #include "hw/scsi/scsi.h" #include "ui/console.h" #include "monitor/monitor.h" #include "sysemu/sysemu.h" #include "sysemu/blockdev.h" //#define DEBUG_MSD #ifdef DEBUG_MSD #define DPRINTF(fmt, ...) \ do { printf("usb-msd: " fmt , ## __VA_ARGS__); } while (0) #else #define DPRINTF(fmt, ...) do {} while(0) #endif /* USB requests. */ #define MassStorageReset 0xff #define GetMaxLun 0xfe enum USBMSDMode { USB_MSDM_CBW, /* Command Block. */ USB_MSDM_DATAOUT, /* Transfer data to device. */ USB_MSDM_DATAIN, /* Transfer data from device. */ USB_MSDM_CSW /* Command Status. */ }; struct usb_msd_csw { uint32_t sig; uint32_t tag; uint32_t residue; uint8_t status; }; typedef struct { USBDevice dev; enum USBMSDMode mode; uint32_t scsi_off; uint32_t scsi_len; uint32_t data_len; struct usb_msd_csw csw; SCSIRequest *req; SCSIBus bus; /* For async completion. */ USBPacket *packet; /* usb-storage only */ BlockConf conf; uint32_t removable; } MSDState; struct usb_msd_cbw { uint32_t sig; uint32_t tag; uint32_t data_len; uint8_t flags; uint8_t lun; uint8_t cmd_len; uint8_t cmd[16]; }; enum { STR_MANUFACTURER = 1, STR_PRODUCT, STR_SERIALNUMBER, STR_CONFIG_FULL, STR_CONFIG_HIGH, STR_CONFIG_SUPER, }; static const USBDescStrings desc_strings = { [STR_MANUFACTURER] = "QEMU", [STR_PRODUCT] = "QEMU USB HARDDRIVE", [STR_SERIALNUMBER] = "1", [STR_CONFIG_FULL] = "Full speed config (usb 1.1)", [STR_CONFIG_HIGH] = "High speed config (usb 2.0)", [STR_CONFIG_SUPER] = "Super speed config (usb 3.0)", }; static const USBDescIface desc_iface_full = { .bInterfaceNumber = 0, .bNumEndpoints = 2, .bInterfaceClass = USB_CLASS_MASS_STORAGE, .bInterfaceSubClass = 0x06, /* SCSI */ .bInterfaceProtocol = 0x50, /* Bulk */ .eps = (USBDescEndpoint[]) { { .bEndpointAddress = USB_DIR_IN | 0x01, .bmAttributes = USB_ENDPOINT_XFER_BULK, .wMaxPacketSize = 64, },{ .bEndpointAddress = USB_DIR_OUT | 0x02, .bmAttributes = USB_ENDPOINT_XFER_BULK, .wMaxPacketSize = 64, }, } }; static const USBDescDevice desc_device_full = { .bcdUSB = 0x0200, .bMaxPacketSize0 = 8, .bNumConfigurations = 1, .confs = (USBDescConfig[]) { { .bNumInterfaces = 1, .bConfigurationValue = 1, .iConfiguration = STR_CONFIG_FULL, .bmAttributes = 0xc0, .nif = 1, .ifs = &desc_iface_full, }, }, }; static const USBDescIface desc_iface_high = { .bInterfaceNumber = 0, .bNumEndpoints = 2, .bInterfaceClass = USB_CLASS_MASS_STORAGE, .bInterfaceSubClass = 0x06, /* SCSI */ .bInterfaceProtocol = 0x50, /* Bulk */ .eps = (USBDescEndpoint[]) { { .bEndpointAddress = USB_DIR_IN | 0x01, .bmAttributes = USB_ENDPOINT_XFER_BULK, .wMaxPacketSize = 512, },{ .bEndpointAddress = USB_DIR_OUT | 0x02, .bmAttributes = USB_ENDPOINT_XFER_BULK, .wMaxPacketSize = 512, }, } }; static const USBDescDevice desc_device_high = { .bcdUSB = 0x0200, .bMaxPacketSize0 = 64, .bNumConfigurations = 1, .confs = (USBDescConfig[]) { { .bNumInterfaces = 1, .bConfigurationValue = 1, .iConfiguration = STR_CONFIG_HIGH, .bmAttributes = 0xc0, .nif = 1, .ifs = &desc_iface_high, }, }, }; static const USBDescIface desc_iface_super = { .bInterfaceNumber = 0, .bNumEndpoints = 2, .bInterfaceClass = USB_CLASS_MASS_STORAGE, .bInterfaceSubClass = 0x06, /* SCSI */ .bInterfaceProtocol = 0x50, /* Bulk */ .eps = (USBDescEndpoint[]) { { .bEndpointAddress = USB_DIR_IN | 0x01, .bmAttributes = USB_ENDPOINT_XFER_BULK, .wMaxPacketSize = 1024, .bMaxBurst = 15, },{ .bEndpointAddress = USB_DIR_OUT | 0x02, .bmAttributes = USB_ENDPOINT_XFER_BULK, .wMaxPacketSize = 1024, .bMaxBurst = 15, }, } }; static const USBDescDevice desc_device_super = { .bcdUSB = 0x0300, .bMaxPacketSize0 = 9, .bNumConfigurations = 1, .confs = (USBDescConfig[]) { { .bNumInterfaces = 1, .bConfigurationValue = 1, .iConfiguration = STR_CONFIG_SUPER, .bmAttributes = 0xc0, .nif = 1, .ifs = &desc_iface_super, }, }, }; static const USBDesc desc = { .id = { .idVendor = 0x46f4, /* CRC16() of "QEMU" */ .idProduct = 0x0001, .bcdDevice = 0, .iManufacturer = STR_MANUFACTURER, .iProduct = STR_PRODUCT, .iSerialNumber = STR_SERIALNUMBER, }, .full = &desc_device_full, .high = &desc_device_high, .super = &desc_device_super, .str = desc_strings, }; static void usb_msd_copy_data(MSDState *s, USBPacket *p) { uint32_t len; len = p->iov.size - p->actual_length; if (len > s->scsi_len) len = s->scsi_len; usb_packet_copy(p, scsi_req_get_buf(s->req) + s->scsi_off, len); s->scsi_len -= len; s->scsi_off += len; s->data_len -= len; if (s->scsi_len == 0 || s->data_len == 0) { scsi_req_continue(s->req); } } static void usb_msd_send_status(MSDState *s, USBPacket *p) { int len; DPRINTF("Command status %d tag 0x%x, len %zd\n", s->csw.status, le32_to_cpu(s->csw.tag), p->iov.size); assert(s->csw.sig == cpu_to_le32(0x53425355)); len = MIN(sizeof(s->csw), p->iov.size); usb_packet_copy(p, &s->csw, len); memset(&s->csw, 0, sizeof(s->csw)); } static void usb_msd_packet_complete(MSDState *s) { USBPacket *p = s->packet; /* Set s->packet to NULL before calling usb_packet_complete because another request may be issued before usb_packet_complete returns. */ DPRINTF("Packet complete %p\n", p); s->packet = NULL; usb_packet_complete(&s->dev, p); } static void usb_msd_transfer_data(SCSIRequest *req, uint32_t len) { MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent); USBPacket *p = s->packet; assert((s->mode == USB_MSDM_DATAOUT) == (req->cmd.mode == SCSI_XFER_TO_DEV)); s->scsi_len = len; s->scsi_off = 0; if (p) { usb_msd_copy_data(s, p); p = s->packet; if (p && p->actual_length == p->iov.size) { p->status = USB_RET_SUCCESS; /* Clear previous ASYNC status */ usb_msd_packet_complete(s); } } } static void usb_msd_command_complete(SCSIRequest *req, uint32_t status, size_t resid) { MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent); USBPacket *p = s->packet; DPRINTF("Command complete %d tag 0x%x\n", status, req->tag); s->csw.sig = cpu_to_le32(0x53425355); s->csw.tag = cpu_to_le32(req->tag); s->csw.residue = cpu_to_le32(s->data_len); s->csw.status = status != 0; if (s->packet) { if (s->data_len == 0 && s->mode == USB_MSDM_DATAOUT) { /* A deferred packet with no write data remaining must be the status read packet. */ usb_msd_send_status(s, p); s->mode = USB_MSDM_CBW; } else if (s->mode == USB_MSDM_CSW) { usb_msd_send_status(s, p); s->mode = USB_MSDM_CBW; } else { if (s->data_len) { int len = (p->iov.size - p->actual_length); usb_packet_skip(p, len); s->data_len -= len; } if (s->data_len == 0) { s->mode = USB_MSDM_CSW; } } p->status = USB_RET_SUCCESS; /* Clear previous ASYNC status */ usb_msd_packet_complete(s); } else if (s->data_len == 0) { s->mode = USB_MSDM_CSW; } scsi_req_unref(req); s->req = NULL; } static void usb_msd_request_cancelled(SCSIRequest *req) { MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent); if (req == s->req) { scsi_req_unref(s->req); s->req = NULL; s->scsi_len = 0; } } static void usb_msd_handle_reset(USBDevice *dev) { MSDState *s = (MSDState *)dev; DPRINTF("Reset\n"); if (s->req) { scsi_req_cancel(s->req); } assert(s->req == NULL); if (s->packet) { s->packet->status = USB_RET_STALL; usb_msd_packet_complete(s); } s->mode = USB_MSDM_CBW; } static void usb_msd_handle_control(USBDevice *dev, USBPacket *p, int request, int value, int index, int length, uint8_t *data) { MSDState *s = (MSDState *)dev; SCSIDevice *scsi_dev; int ret, maxlun; ret = usb_desc_handle_control(dev, p, request, value, index, length, data); if (ret >= 0) { return; } switch (request) { case EndpointOutRequest | USB_REQ_CLEAR_FEATURE: break; /* Class specific requests. */ case ClassInterfaceOutRequest | MassStorageReset: /* Reset state ready for the next CBW. */ s->mode = USB_MSDM_CBW; break; case ClassInterfaceRequest | GetMaxLun: maxlun = 0; for (;;) { scsi_dev = scsi_device_find(&s->bus, 0, 0, maxlun+1); if (scsi_dev == NULL) { break; } if (scsi_dev->lun != maxlun+1) { break; } maxlun++; } DPRINTF("MaxLun %d\n", maxlun); data[0] = maxlun; p->actual_length = 1; break; default: p->status = USB_RET_STALL; break; } } static void usb_msd_cancel_io(USBDevice *dev, USBPacket *p) { MSDState *s = DO_UPCAST(MSDState, dev, dev); assert(s->packet == p); s->packet = NULL; if (s->req) { scsi_req_cancel(s->req); } } static void usb_msd_handle_data(USBDevice *dev, USBPacket *p) { MSDState *s = (MSDState *)dev; uint32_t tag; struct usb_msd_cbw cbw; uint8_t devep = p->ep->nr; SCSIDevice *scsi_dev; uint32_t len; switch (p->pid) { case USB_TOKEN_OUT: if (devep != 2) goto fail; switch (s->mode) { case USB_MSDM_CBW: if (p->iov.size != 31) { fprintf(stderr, "usb-msd: Bad CBW size"); goto fail; } usb_packet_copy(p, &cbw, 31); if (le32_to_cpu(cbw.sig) != 0x43425355) { fprintf(stderr, "usb-msd: Bad signature %08x\n", le32_to_cpu(cbw.sig)); goto fail; } DPRINTF("Command on LUN %d\n", cbw.lun); scsi_dev = scsi_device_find(&s->bus, 0, 0, cbw.lun); if (scsi_dev == NULL) { fprintf(stderr, "usb-msd: Bad LUN %d\n", cbw.lun); goto fail; } tag = le32_to_cpu(cbw.tag); s->data_len = le32_to_cpu(cbw.data_len); if (s->data_len == 0) { s->mode = USB_MSDM_CSW; } else if (cbw.flags & 0x80) { s->mode = USB_MSDM_DATAIN; } else { s->mode = USB_MSDM_DATAOUT; } DPRINTF("Command tag 0x%x flags %08x len %d data %d\n", tag, cbw.flags, cbw.cmd_len, s->data_len); assert(le32_to_cpu(s->csw.residue) == 0); s->scsi_len = 0; s->req = scsi_req_new(scsi_dev, tag, cbw.lun, cbw.cmd, NULL); #ifdef DEBUG_MSD scsi_req_print(s->req); #endif len = scsi_req_enqueue(s->req); if (len) { scsi_req_continue(s->req); } break; case USB_MSDM_DATAOUT: DPRINTF("Data out %zd/%d\n", p->iov.size, s->data_len); if (p->iov.size > s->data_len) { goto fail; } if (s->scsi_len) { usb_msd_copy_data(s, p); } if (le32_to_cpu(s->csw.residue)) { int len = p->iov.size - p->actual_length; if (len) { usb_packet_skip(p, len); s->data_len -= len; if (s->data_len == 0) { s->mode = USB_MSDM_CSW; } } } if (p->actual_length < p->iov.size) { DPRINTF("Deferring packet %p [wait data-out]\n", p); s->packet = p; p->status = USB_RET_ASYNC; } break; default: DPRINTF("Unexpected write (len %zd)\n", p->iov.size); goto fail; } break; case USB_TOKEN_IN: if (devep != 1) goto fail; switch (s->mode) { case USB_MSDM_DATAOUT: if (s->data_len != 0 || p->iov.size < 13) { goto fail; } /* Waiting for SCSI write to complete. */ s->packet = p; p->status = USB_RET_ASYNC; break; case USB_MSDM_CSW: if (p->iov.size < 13) { goto fail; } if (s->req) { /* still in flight */ DPRINTF("Deferring packet %p [wait status]\n", p); s->packet = p; p->status = USB_RET_ASYNC; } else { usb_msd_send_status(s, p); s->mode = USB_MSDM_CBW; } break; case USB_MSDM_DATAIN: DPRINTF("Data in %zd/%d, scsi_len %d\n", p->iov.size, s->data_len, s->scsi_len); if (s->scsi_len) { usb_msd_copy_data(s, p); } if (le32_to_cpu(s->csw.residue)) { int len = p->iov.size - p->actual_length; if (len) { usb_packet_skip(p, len); s->data_len -= len; if (s->data_len == 0) { s->mode = USB_MSDM_CSW; } } } if (p->actual_length < p->iov.size) { DPRINTF("Deferring packet %p [wait data-in]\n", p); s->packet = p; p->status = USB_RET_ASYNC; } break; default: DPRINTF("Unexpected read (len %zd)\n", p->iov.size); goto fail; } break; default: DPRINTF("Bad token\n"); fail: p->status = USB_RET_STALL; break; } } static void usb_msd_password_cb(void *opaque, int err) { MSDState *s = opaque; if (!err) err = usb_device_attach(&s->dev); if (err) qdev_unplug(&s->dev.qdev, NULL); } static void *usb_msd_load_request(QEMUFile *f, SCSIRequest *req) { MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent); /* nothing to load, just store req in our state struct */ assert(s->req == NULL); scsi_req_ref(req); s->req = req; return NULL; } static const struct SCSIBusInfo usb_msd_scsi_info_storage = { .tcq = false, .max_target = 0, .max_lun = 0, .transfer_data = usb_msd_transfer_data, .complete = usb_msd_command_complete, .cancel = usb_msd_request_cancelled, .load_request = usb_msd_load_request, }; static const struct SCSIBusInfo usb_msd_scsi_info_bot = { .tcq = false, .max_target = 0, .max_lun = 15, .transfer_data = usb_msd_transfer_data, .complete = usb_msd_command_complete, .cancel = usb_msd_request_cancelled, .load_request = usb_msd_load_request, }; static int usb_msd_initfn_storage(USBDevice *dev) { MSDState *s = DO_UPCAST(MSDState, dev, dev); BlockDriverState *bs = s->conf.bs; SCSIDevice *scsi_dev; Error *err = NULL; if (!bs) { error_report("drive property not set"); return -1; } blkconf_serial(&s->conf, &dev->serial); /* * Hack alert: this pretends to be a block device, but it's really * a SCSI bus that can serve only a single device, which it * creates automatically. But first it needs to detach from its * blockdev, or else scsi_bus_legacy_add_drive() dies when it * attaches again. * * The hack is probably a bad idea. */ bdrv_detach_dev(bs, &s->dev.qdev); s->conf.bs = NULL; usb_desc_create_serial(dev); usb_desc_init(dev); scsi_bus_new(&s->bus, &s->dev.qdev, &usb_msd_scsi_info_storage, NULL); scsi_dev = scsi_bus_legacy_add_drive(&s->bus, bs, 0, !!s->removable, s->conf.bootindex, dev->serial, &err); if (!scsi_dev) { return -1; } s->bus.qbus.allow_hotplug = 0; usb_msd_handle_reset(dev); if (bdrv_key_required(bs)) { if (cur_mon) { monitor_read_bdrv_key_start(cur_mon, bs, usb_msd_password_cb, s); s->dev.auto_attach = 0; } else { autostart = 0; } } return 0; } static int usb_msd_initfn_bot(USBDevice *dev) { MSDState *s = DO_UPCAST(MSDState, dev, dev); usb_desc_create_serial(dev); usb_desc_init(dev); scsi_bus_new(&s->bus, &s->dev.qdev, &usb_msd_scsi_info_bot, NULL); s->bus.qbus.allow_hotplug = 0; usb_msd_handle_reset(dev); return 0; } static USBDevice *usb_msd_init(USBBus *bus, const char *filename) { static int nr=0; char id[8]; QemuOpts *opts; DriveInfo *dinfo; USBDevice *dev; const char *p1; char fmt[32]; /* parse -usbdevice disk: syntax into drive opts */ snprintf(id, sizeof(id), "usb%d", nr++); opts = qemu_opts_create(qemu_find_opts("drive"), id, 0, NULL); p1 = strchr(filename, ':'); if (p1++) { const char *p2; if (strstart(filename, "format=", &p2)) { int len = MIN(p1 - p2, sizeof(fmt)); pstrcpy(fmt, len, p2); qemu_opt_set(opts, "format", fmt); } else if (*filename != ':') { printf("unrecognized USB mass-storage option %s\n", filename); return NULL; } filename = p1; } if (!*filename) { printf("block device specification needed\n"); return NULL; } qemu_opt_set(opts, "file", filename); qemu_opt_set(opts, "if", "none"); /* create host drive */ dinfo = drive_init(opts, 0); if (!dinfo) { qemu_opts_del(opts); return NULL; } /* create guest device */ dev = usb_create(bus, "usb-storage"); if (!dev) { return NULL; } if (qdev_prop_set_drive(&dev->qdev, "drive", dinfo->bdrv) < 0) { qdev_free(&dev->qdev); return NULL; } if (qdev_init(&dev->qdev) < 0) return NULL; return dev; } static const VMStateDescription vmstate_usb_msd = { .name = "usb-storage", .version_id = 1, .minimum_version_id = 1, .fields = (VMStateField []) { VMSTATE_USB_DEVICE(dev, MSDState), VMSTATE_UINT32(mode, MSDState), VMSTATE_UINT32(scsi_len, MSDState), VMSTATE_UINT32(scsi_off, MSDState), VMSTATE_UINT32(data_len, MSDState), VMSTATE_UINT32(csw.sig, MSDState), VMSTATE_UINT32(csw.tag, MSDState), VMSTATE_UINT32(csw.residue, MSDState), VMSTATE_UINT8(csw.status, MSDState), VMSTATE_END_OF_LIST() } }; static Property msd_properties[] = { DEFINE_BLOCK_PROPERTIES(MSDState, conf), DEFINE_PROP_BIT("removable", MSDState, removable, 0, false), DEFINE_PROP_END_OF_LIST(), }; static void usb_msd_class_initfn_common(ObjectClass *klass) { DeviceClass *dc = DEVICE_CLASS(klass); USBDeviceClass *uc = USB_DEVICE_CLASS(klass); uc->product_desc = "QEMU USB MSD"; uc->usb_desc = &desc; uc->cancel_packet = usb_msd_cancel_io; uc->handle_attach = usb_desc_attach; uc->handle_reset = usb_msd_handle_reset; uc->handle_control = usb_msd_handle_control; uc->handle_data = usb_msd_handle_data; dc->fw_name = "storage"; dc->vmsd = &vmstate_usb_msd; } static void usb_msd_class_initfn_storage(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); USBDeviceClass *uc = USB_DEVICE_CLASS(klass); uc->init = usb_msd_initfn_storage; dc->props = msd_properties; usb_msd_class_initfn_common(klass); } static void usb_msd_class_initfn_bot(ObjectClass *klass, void *data) { USBDeviceClass *uc = USB_DEVICE_CLASS(klass); uc->init = usb_msd_initfn_bot; usb_msd_class_initfn_common(klass); } static const TypeInfo msd_info = { .name = "usb-storage", .parent = TYPE_USB_DEVICE, .instance_size = sizeof(MSDState), .class_init = usb_msd_class_initfn_storage, }; static const TypeInfo bot_info = { .name = "usb-bot", .parent = TYPE_USB_DEVICE, .instance_size = sizeof(MSDState), .class_init = usb_msd_class_initfn_bot, }; static void usb_msd_register_types(void) { type_register_static(&msd_info); type_register_static(&bot_info); usb_legacy_register("usb-storage", "disk", usb_msd_init); } type_init(usb_msd_register_types)