630 lines
17 KiB
C
630 lines
17 KiB
C
/*
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* USB Mass Storage Device emulation
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*
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* Copyright (c) 2006 CodeSourcery.
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* Written by Paul Brook
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*
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* This code is licenced under the LGPL.
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*/
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#include "qemu-common.h"
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#include "qemu-option.h"
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#include "qemu-config.h"
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#include "usb.h"
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#include "usb-desc.h"
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#include "scsi.h"
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#include "console.h"
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#include "monitor.h"
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#include "sysemu.h"
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#include "blockdev.h"
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//#define DEBUG_MSD
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#ifdef DEBUG_MSD
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#define DPRINTF(fmt, ...) \
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do { printf("usb-msd: " fmt , ## __VA_ARGS__); } while (0)
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#else
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#define DPRINTF(fmt, ...) do {} while(0)
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#endif
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/* USB requests. */
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#define MassStorageReset 0xff
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#define GetMaxLun 0xfe
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enum USBMSDMode {
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USB_MSDM_CBW, /* Command Block. */
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USB_MSDM_DATAOUT, /* Transfer data to device. */
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USB_MSDM_DATAIN, /* Transfer data from device. */
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USB_MSDM_CSW /* Command Status. */
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};
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typedef struct {
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USBDevice dev;
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enum USBMSDMode mode;
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uint32_t scsi_len;
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uint8_t *scsi_buf;
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uint32_t usb_len;
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uint8_t *usb_buf;
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uint32_t data_len;
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uint32_t residue;
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uint32_t tag;
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SCSIRequest *req;
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SCSIBus bus;
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BlockConf conf;
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SCSIDevice *scsi_dev;
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uint32_t removable;
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int result;
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/* For async completion. */
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USBPacket *packet;
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} MSDState;
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struct usb_msd_cbw {
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uint32_t sig;
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uint32_t tag;
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uint32_t data_len;
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uint8_t flags;
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uint8_t lun;
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uint8_t cmd_len;
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uint8_t cmd[16];
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};
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struct usb_msd_csw {
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uint32_t sig;
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uint32_t tag;
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uint32_t residue;
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uint8_t status;
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};
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enum {
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STR_MANUFACTURER = 1,
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STR_PRODUCT,
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STR_SERIALNUMBER,
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STR_CONFIG_FULL,
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STR_CONFIG_HIGH,
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};
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static const USBDescStrings desc_strings = {
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[STR_MANUFACTURER] = "QEMU " QEMU_VERSION,
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[STR_PRODUCT] = "QEMU USB HARDDRIVE",
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[STR_SERIALNUMBER] = "1",
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[STR_CONFIG_FULL] = "Full speed config (usb 1.1)",
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[STR_CONFIG_HIGH] = "High speed config (usb 2.0)",
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};
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static const USBDescIface desc_iface_full = {
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.bInterfaceNumber = 0,
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.bNumEndpoints = 2,
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.bInterfaceClass = USB_CLASS_MASS_STORAGE,
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.bInterfaceSubClass = 0x06, /* SCSI */
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.bInterfaceProtocol = 0x50, /* Bulk */
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.eps = (USBDescEndpoint[]) {
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{
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.bEndpointAddress = USB_DIR_IN | 0x01,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = 64,
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},{
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.bEndpointAddress = USB_DIR_OUT | 0x02,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = 64,
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},
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}
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};
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static const USBDescDevice desc_device_full = {
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.bcdUSB = 0x0200,
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.bMaxPacketSize0 = 8,
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.bNumConfigurations = 1,
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.confs = (USBDescConfig[]) {
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{
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.bNumInterfaces = 1,
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.bConfigurationValue = 1,
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.iConfiguration = STR_CONFIG_FULL,
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.bmAttributes = 0xc0,
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.ifs = &desc_iface_full,
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},
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},
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};
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static const USBDescIface desc_iface_high = {
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.bInterfaceNumber = 0,
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.bNumEndpoints = 2,
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.bInterfaceClass = USB_CLASS_MASS_STORAGE,
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.bInterfaceSubClass = 0x06, /* SCSI */
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.bInterfaceProtocol = 0x50, /* Bulk */
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.eps = (USBDescEndpoint[]) {
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{
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.bEndpointAddress = USB_DIR_IN | 0x01,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = 512,
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},{
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.bEndpointAddress = USB_DIR_OUT | 0x02,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = 512,
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},
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}
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};
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static const USBDescDevice desc_device_high = {
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.bcdUSB = 0x0200,
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.bMaxPacketSize0 = 64,
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.bNumConfigurations = 1,
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.confs = (USBDescConfig[]) {
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{
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.bNumInterfaces = 1,
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.bConfigurationValue = 1,
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.iConfiguration = STR_CONFIG_HIGH,
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.bmAttributes = 0xc0,
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.ifs = &desc_iface_high,
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},
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},
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};
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static const USBDesc desc = {
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.id = {
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.idVendor = 0,
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.idProduct = 0,
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.bcdDevice = 0,
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.iManufacturer = STR_MANUFACTURER,
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.iProduct = STR_PRODUCT,
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.iSerialNumber = STR_SERIALNUMBER,
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},
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.full = &desc_device_full,
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.high = &desc_device_high,
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.str = desc_strings,
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};
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static void usb_msd_copy_data(MSDState *s)
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{
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uint32_t len;
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len = s->usb_len;
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if (len > s->scsi_len)
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len = s->scsi_len;
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if (s->mode == USB_MSDM_DATAIN) {
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memcpy(s->usb_buf, s->scsi_buf, len);
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} else {
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memcpy(s->scsi_buf, s->usb_buf, len);
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}
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s->usb_len -= len;
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s->scsi_len -= len;
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s->usb_buf += len;
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s->scsi_buf += len;
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s->data_len -= len;
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if (s->scsi_len == 0 || s->data_len == 0) {
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if (s->mode == USB_MSDM_DATAIN) {
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s->scsi_dev->info->read_data(s->req);
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} else if (s->mode == USB_MSDM_DATAOUT) {
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s->scsi_dev->info->write_data(s->req);
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}
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}
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}
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static void usb_msd_send_status(MSDState *s, USBPacket *p)
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{
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struct usb_msd_csw csw;
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int len;
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csw.sig = cpu_to_le32(0x53425355);
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csw.tag = cpu_to_le32(s->tag);
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csw.residue = s->residue;
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csw.status = s->result;
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len = MIN(sizeof(csw), p->len);
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memcpy(p->data, &csw, len);
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}
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static void usb_msd_command_complete(SCSIRequest *req, int reason, uint32_t arg)
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{
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MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent);
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USBPacket *p = s->packet;
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if (req->tag != s->tag) {
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fprintf(stderr, "usb-msd: Unexpected SCSI Tag 0x%x\n", req->tag);
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}
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if (reason == SCSI_REASON_DONE) {
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DPRINTF("Command complete %d\n", arg);
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s->residue = s->data_len;
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s->result = arg != 0;
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if (s->packet) {
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if (s->data_len == 0 && s->mode == USB_MSDM_DATAOUT) {
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/* A deferred packet with no write data remaining must be
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the status read packet. */
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usb_msd_send_status(s, p);
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s->mode = USB_MSDM_CBW;
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} else {
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if (s->data_len) {
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s->data_len -= s->usb_len;
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if (s->mode == USB_MSDM_DATAIN)
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memset(s->usb_buf, 0, s->usb_len);
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s->usb_len = 0;
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}
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if (s->data_len == 0)
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s->mode = USB_MSDM_CSW;
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}
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s->packet = NULL;
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usb_packet_complete(&s->dev, p);
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} else if (s->data_len == 0) {
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s->mode = USB_MSDM_CSW;
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}
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scsi_req_unref(req);
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s->req = NULL;
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return;
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}
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s->scsi_len = arg;
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s->scsi_buf = s->scsi_dev->info->get_buf(req);
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if (p) {
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usb_msd_copy_data(s);
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if (s->usb_len == 0) {
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/* Set s->packet to NULL before calling usb_packet_complete
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because another request may be issued before
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usb_packet_complete returns. */
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DPRINTF("Packet complete %p\n", p);
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s->packet = NULL;
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usb_packet_complete(&s->dev, p);
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}
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}
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}
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static void usb_msd_handle_reset(USBDevice *dev)
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{
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MSDState *s = (MSDState *)dev;
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DPRINTF("Reset\n");
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s->mode = USB_MSDM_CBW;
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}
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static int usb_msd_handle_control(USBDevice *dev, int request, int value,
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int index, int length, uint8_t *data)
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{
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MSDState *s = (MSDState *)dev;
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int ret;
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ret = usb_desc_handle_control(dev, request, value, index, length, data);
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if (ret >= 0) {
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return ret;
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}
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ret = 0;
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switch (request) {
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case DeviceRequest | USB_REQ_GET_INTERFACE:
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data[0] = 0;
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ret = 1;
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break;
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case DeviceOutRequest | USB_REQ_SET_INTERFACE:
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ret = 0;
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break;
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case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
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ret = 0;
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break;
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case InterfaceOutRequest | USB_REQ_SET_INTERFACE:
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ret = 0;
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break;
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/* Class specific requests. */
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case ClassInterfaceOutRequest | MassStorageReset:
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/* Reset state ready for the next CBW. */
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s->mode = USB_MSDM_CBW;
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ret = 0;
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break;
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case ClassInterfaceRequest | GetMaxLun:
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data[0] = 0;
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ret = 1;
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break;
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default:
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ret = USB_RET_STALL;
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break;
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}
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return ret;
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}
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static void usb_msd_cancel_io(USBPacket *p, void *opaque)
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{
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MSDState *s = opaque;
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s->scsi_dev->info->cancel_io(s->req);
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s->packet = NULL;
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s->scsi_len = 0;
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}
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static int usb_msd_handle_data(USBDevice *dev, USBPacket *p)
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{
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MSDState *s = (MSDState *)dev;
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int ret = 0;
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struct usb_msd_cbw cbw;
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uint8_t devep = p->devep;
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uint8_t *data = p->data;
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int len = p->len;
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switch (p->pid) {
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case USB_TOKEN_OUT:
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if (devep != 2)
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goto fail;
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switch (s->mode) {
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case USB_MSDM_CBW:
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if (len != 31) {
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fprintf(stderr, "usb-msd: Bad CBW size");
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goto fail;
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}
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memcpy(&cbw, data, 31);
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if (le32_to_cpu(cbw.sig) != 0x43425355) {
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fprintf(stderr, "usb-msd: Bad signature %08x\n",
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le32_to_cpu(cbw.sig));
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goto fail;
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}
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DPRINTF("Command on LUN %d\n", cbw.lun);
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if (cbw.lun != 0) {
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fprintf(stderr, "usb-msd: Bad LUN %d\n", cbw.lun);
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goto fail;
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}
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s->tag = le32_to_cpu(cbw.tag);
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s->data_len = le32_to_cpu(cbw.data_len);
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if (s->data_len == 0) {
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s->mode = USB_MSDM_CSW;
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} else if (cbw.flags & 0x80) {
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s->mode = USB_MSDM_DATAIN;
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} else {
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s->mode = USB_MSDM_DATAOUT;
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}
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DPRINTF("Command tag 0x%x flags %08x len %d data %d\n",
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s->tag, cbw.flags, cbw.cmd_len, s->data_len);
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s->residue = 0;
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s->scsi_len = 0;
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s->req = s->scsi_dev->info->alloc_req(s->scsi_dev, s->tag, 0);
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s->scsi_dev->info->send_command(s->req, cbw.cmd);
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/* ??? Should check that USB and SCSI data transfer
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directions match. */
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if (s->residue == 0) {
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if (s->mode == USB_MSDM_DATAIN) {
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s->scsi_dev->info->read_data(s->req);
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} else if (s->mode == USB_MSDM_DATAOUT) {
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s->scsi_dev->info->write_data(s->req);
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}
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}
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ret = len;
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break;
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case USB_MSDM_DATAOUT:
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DPRINTF("Data out %d/%d\n", len, s->data_len);
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if (len > s->data_len)
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goto fail;
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s->usb_buf = data;
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s->usb_len = len;
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if (s->scsi_len) {
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usb_msd_copy_data(s);
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}
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if (s->residue && s->usb_len) {
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s->data_len -= s->usb_len;
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if (s->data_len == 0)
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s->mode = USB_MSDM_CSW;
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s->usb_len = 0;
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}
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if (s->usb_len) {
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DPRINTF("Deferring packet %p\n", p);
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usb_defer_packet(p, usb_msd_cancel_io, s);
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s->packet = p;
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ret = USB_RET_ASYNC;
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} else {
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ret = len;
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}
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break;
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default:
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DPRINTF("Unexpected write (len %d)\n", len);
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goto fail;
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}
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break;
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case USB_TOKEN_IN:
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if (devep != 1)
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goto fail;
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switch (s->mode) {
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case USB_MSDM_DATAOUT:
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if (s->data_len != 0 || len < 13)
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goto fail;
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/* Waiting for SCSI write to complete. */
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usb_defer_packet(p, usb_msd_cancel_io, s);
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s->packet = p;
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ret = USB_RET_ASYNC;
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break;
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case USB_MSDM_CSW:
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DPRINTF("Command status %d tag 0x%x, len %d\n",
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s->result, s->tag, len);
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if (len < 13)
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goto fail;
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usb_msd_send_status(s, p);
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s->mode = USB_MSDM_CBW;
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ret = 13;
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break;
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case USB_MSDM_DATAIN:
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DPRINTF("Data in %d/%d, scsi_len %d\n", len, s->data_len, s->scsi_len);
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if (len > s->data_len)
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len = s->data_len;
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s->usb_buf = data;
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s->usb_len = len;
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if (s->scsi_len) {
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usb_msd_copy_data(s);
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}
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if (s->residue && s->usb_len) {
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s->data_len -= s->usb_len;
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memset(s->usb_buf, 0, s->usb_len);
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if (s->data_len == 0)
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s->mode = USB_MSDM_CSW;
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s->usb_len = 0;
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}
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if (s->usb_len) {
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DPRINTF("Deferring packet %p\n", p);
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usb_defer_packet(p, usb_msd_cancel_io, s);
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s->packet = p;
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ret = USB_RET_ASYNC;
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} else {
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ret = len;
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}
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break;
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default:
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DPRINTF("Unexpected read (len %d)\n", len);
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goto fail;
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}
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break;
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default:
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DPRINTF("Bad token\n");
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fail:
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ret = USB_RET_STALL;
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break;
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}
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return ret;
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}
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static void usb_msd_password_cb(void *opaque, int err)
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{
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MSDState *s = opaque;
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if (!err)
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usb_device_attach(&s->dev);
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else
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qdev_unplug(&s->dev.qdev);
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}
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static const struct SCSIBusOps usb_msd_scsi_ops = {
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.complete = usb_msd_command_complete
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};
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static int usb_msd_initfn(USBDevice *dev)
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{
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MSDState *s = DO_UPCAST(MSDState, dev, dev);
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BlockDriverState *bs = s->conf.bs;
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DriveInfo *dinfo;
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if (!bs) {
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error_report("usb-msd: drive property not set");
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return -1;
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}
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/*
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* Hack alert: this pretends to be a block device, but it's really
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* a SCSI bus that can serve only a single device, which it
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* creates automatically. But first it needs to detach from its
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* blockdev, or else scsi_bus_legacy_add_drive() dies when it
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* attaches again.
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*
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* The hack is probably a bad idea.
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*/
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bdrv_detach(bs, &s->dev.qdev);
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s->conf.bs = NULL;
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dinfo = drive_get_by_blockdev(bs);
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if (dinfo && dinfo->serial) {
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usb_desc_set_string(dev, STR_SERIALNUMBER, dinfo->serial);
|
|
}
|
|
|
|
usb_desc_init(dev);
|
|
scsi_bus_new(&s->bus, &s->dev.qdev, 0, 1, &usb_msd_scsi_ops);
|
|
s->scsi_dev = scsi_bus_legacy_add_drive(&s->bus, bs, 0, !!s->removable);
|
|
if (!s->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;
|
|
}
|
|
}
|
|
|
|
add_boot_device_path(s->conf.bootindex, &dev->qdev, "/disk@0,0");
|
|
return 0;
|
|
}
|
|
|
|
static USBDevice *usb_msd_init(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);
|
|
|
|
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(NULL /* FIXME */, "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 struct USBDeviceInfo msd_info = {
|
|
.product_desc = "QEMU USB MSD",
|
|
.qdev.name = "usb-storage",
|
|
.qdev.fw_name = "storage",
|
|
.qdev.size = sizeof(MSDState),
|
|
.usb_desc = &desc,
|
|
.init = usb_msd_initfn,
|
|
.handle_packet = usb_generic_handle_packet,
|
|
.handle_attach = usb_desc_attach,
|
|
.handle_reset = usb_msd_handle_reset,
|
|
.handle_control = usb_msd_handle_control,
|
|
.handle_data = usb_msd_handle_data,
|
|
.usbdevice_name = "disk",
|
|
.usbdevice_init = usb_msd_init,
|
|
.qdev.props = (Property[]) {
|
|
DEFINE_BLOCK_PROPERTIES(MSDState, conf),
|
|
DEFINE_PROP_BIT("removable", MSDState, removable, 0, false),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
},
|
|
};
|
|
|
|
static void usb_msd_register_devices(void)
|
|
{
|
|
usb_qdev_register(&msd_info);
|
|
}
|
|
device_init(usb_msd_register_devices)
|