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/*
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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 licensed 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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|
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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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|
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/* USB requests. */
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#define MassStorageReset 0xff |
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#define GetMaxLun 0xfe |
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|
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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 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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char *serial;
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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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|
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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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|
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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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|
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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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|
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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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|
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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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.nif = 1,
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.ifs = &desc_iface_full, |
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}, |
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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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}; |
146 |
|
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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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.nif = 1,
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.ifs = &desc_iface_high, |
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}, |
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}, |
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}; |
162 |
|
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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, |
170 |
.iSerialNumber = STR_SERIALNUMBER, |
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}, |
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.full = &desc_device_full, |
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.high = &desc_device_high, |
174 |
.str = desc_strings, |
175 |
}; |
176 |
|
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static void usb_msd_copy_data(MSDState *s, USBPacket *p) |
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{ |
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uint32_t len; |
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len = p->iov.size - p->result; |
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if (len > s->scsi_len)
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len = s->scsi_len; |
183 |
usb_packet_copy(p, s->scsi_buf, len); |
184 |
s->scsi_len -= len; |
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s->scsi_buf += len; |
186 |
s->data_len -= len; |
187 |
if (s->scsi_len == 0 || s->data_len == 0) { |
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scsi_req_continue(s->req); |
189 |
} |
190 |
} |
191 |
|
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static void usb_msd_send_status(MSDState *s, USBPacket *p) |
193 |
{ |
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struct usb_msd_csw csw;
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int len;
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|
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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->iov.size);
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usb_packet_copy(p, &csw, len); |
204 |
p->result = len; |
205 |
} |
206 |
|
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static void usb_msd_transfer_data(SCSIRequest *req, uint32_t len) |
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{ |
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MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent); |
210 |
USBPacket *p = s->packet; |
211 |
|
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assert((s->mode == USB_MSDM_DATAOUT) == (req->cmd.mode == SCSI_XFER_TO_DEV)); |
213 |
s->scsi_len = len; |
214 |
s->scsi_buf = scsi_req_get_buf(req); |
215 |
if (p) {
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usb_msd_copy_data(s, p); |
217 |
p = s->packet; |
218 |
if (p && p->result == p->iov.size) {
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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); |
225 |
} |
226 |
} |
227 |
} |
228 |
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static void usb_msd_command_complete(SCSIRequest *req, uint32_t status) |
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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; |
233 |
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DPRINTF("Command complete %d\n", status);
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s->residue = s->data_len; |
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s->result = status != 0;
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237 |
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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240 |
the status read packet. */
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usb_msd_send_status(s, p); |
242 |
s->mode = USB_MSDM_CBW; |
243 |
} else {
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if (s->data_len) {
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int len = (p->iov.size - p->result);
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usb_packet_skip(p, len); |
247 |
s->data_len -= len; |
248 |
} |
249 |
if (s->data_len == 0) { |
250 |
s->mode = USB_MSDM_CSW; |
251 |
} |
252 |
} |
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s->packet = NULL;
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usb_packet_complete(&s->dev, p); |
255 |
} else if (s->data_len == 0) { |
256 |
s->mode = USB_MSDM_CSW; |
257 |
} |
258 |
scsi_req_unref(req); |
259 |
s->req = NULL;
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} |
261 |
|
262 |
static void usb_msd_request_cancelled(SCSIRequest *req) |
263 |
{ |
264 |
MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent); |
265 |
|
266 |
if (req == s->req) {
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scsi_req_unref(s->req); |
268 |
s->req = NULL;
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s->packet = NULL;
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s->scsi_len = 0;
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} |
272 |
} |
273 |
|
274 |
static void usb_msd_handle_reset(USBDevice *dev) |
275 |
{ |
276 |
MSDState *s = (MSDState *)dev; |
277 |
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DPRINTF("Reset\n");
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s->mode = USB_MSDM_CBW; |
280 |
} |
281 |
|
282 |
static int usb_msd_handle_control(USBDevice *dev, USBPacket *p, |
283 |
int request, int value, int index, int length, uint8_t *data) |
284 |
{ |
285 |
MSDState *s = (MSDState *)dev; |
286 |
int ret;
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|
288 |
ret = usb_desc_handle_control(dev, p, request, value, index, length, data); |
289 |
if (ret >= 0) { |
290 |
return ret;
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291 |
} |
292 |
|
293 |
ret = 0;
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294 |
switch (request) {
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295 |
case DeviceRequest | USB_REQ_GET_INTERFACE:
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296 |
data[0] = 0; |
297 |
ret = 1;
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298 |
break;
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299 |
case DeviceOutRequest | USB_REQ_SET_INTERFACE:
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300 |
ret = 0;
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301 |
break;
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302 |
case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
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303 |
ret = 0;
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304 |
break;
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305 |
case InterfaceOutRequest | USB_REQ_SET_INTERFACE:
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306 |
ret = 0;
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307 |
break;
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308 |
/* Class specific requests. */
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309 |
case ClassInterfaceOutRequest | MassStorageReset:
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310 |
/* Reset state ready for the next CBW. */
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311 |
s->mode = USB_MSDM_CBW; |
312 |
ret = 0;
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313 |
break;
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314 |
case ClassInterfaceRequest | GetMaxLun:
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315 |
data[0] = 0; |
316 |
ret = 1;
|
317 |
break;
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318 |
default:
|
319 |
ret = USB_RET_STALL; |
320 |
break;
|
321 |
} |
322 |
return ret;
|
323 |
} |
324 |
|
325 |
static void usb_msd_cancel_io(USBDevice *dev, USBPacket *p) |
326 |
{ |
327 |
MSDState *s = DO_UPCAST(MSDState, dev, dev); |
328 |
scsi_req_cancel(s->req); |
329 |
} |
330 |
|
331 |
static int usb_msd_handle_data(USBDevice *dev, USBPacket *p) |
332 |
{ |
333 |
MSDState *s = (MSDState *)dev; |
334 |
int ret = 0; |
335 |
struct usb_msd_cbw cbw;
|
336 |
uint8_t devep = p->devep; |
337 |
|
338 |
switch (p->pid) {
|
339 |
case USB_TOKEN_OUT:
|
340 |
if (devep != 2) |
341 |
goto fail;
|
342 |
|
343 |
switch (s->mode) {
|
344 |
case USB_MSDM_CBW:
|
345 |
if (p->iov.size != 31) { |
346 |
fprintf(stderr, "usb-msd: Bad CBW size");
|
347 |
goto fail;
|
348 |
} |
349 |
usb_packet_copy(p, &cbw, 31);
|
350 |
if (le32_to_cpu(cbw.sig) != 0x43425355) { |
351 |
fprintf(stderr, "usb-msd: Bad signature %08x\n",
|
352 |
le32_to_cpu(cbw.sig)); |
353 |
goto fail;
|
354 |
} |
355 |
DPRINTF("Command on LUN %d\n", cbw.lun);
|
356 |
if (cbw.lun != 0) { |
357 |
fprintf(stderr, "usb-msd: Bad LUN %d\n", cbw.lun);
|
358 |
goto fail;
|
359 |
} |
360 |
s->tag = le32_to_cpu(cbw.tag); |
361 |
s->data_len = le32_to_cpu(cbw.data_len); |
362 |
if (s->data_len == 0) { |
363 |
s->mode = USB_MSDM_CSW; |
364 |
} else if (cbw.flags & 0x80) { |
365 |
s->mode = USB_MSDM_DATAIN; |
366 |
} else {
|
367 |
s->mode = USB_MSDM_DATAOUT; |
368 |
} |
369 |
DPRINTF("Command tag 0x%x flags %08x len %d data %d\n",
|
370 |
s->tag, cbw.flags, cbw.cmd_len, s->data_len); |
371 |
s->residue = 0;
|
372 |
s->scsi_len = 0;
|
373 |
s->req = scsi_req_new(s->scsi_dev, s->tag, 0, cbw.cmd, NULL); |
374 |
scsi_req_enqueue(s->req); |
375 |
/* ??? Should check that USB and SCSI data transfer
|
376 |
directions match. */
|
377 |
if (s->mode != USB_MSDM_CSW && s->residue == 0) { |
378 |
scsi_req_continue(s->req); |
379 |
} |
380 |
ret = p->result; |
381 |
break;
|
382 |
|
383 |
case USB_MSDM_DATAOUT:
|
384 |
DPRINTF("Data out %zd/%d\n", p->iov.size, s->data_len);
|
385 |
if (p->iov.size > s->data_len) {
|
386 |
goto fail;
|
387 |
} |
388 |
|
389 |
if (s->scsi_len) {
|
390 |
usb_msd_copy_data(s, p); |
391 |
} |
392 |
if (s->residue) {
|
393 |
int len = p->iov.size - p->result;
|
394 |
if (len) {
|
395 |
usb_packet_skip(p, len); |
396 |
s->data_len -= len; |
397 |
if (s->data_len == 0) { |
398 |
s->mode = USB_MSDM_CSW; |
399 |
} |
400 |
} |
401 |
} |
402 |
if (p->result < p->iov.size) {
|
403 |
DPRINTF("Deferring packet %p\n", p);
|
404 |
s->packet = p; |
405 |
ret = USB_RET_ASYNC; |
406 |
} else {
|
407 |
ret = p->result; |
408 |
} |
409 |
break;
|
410 |
|
411 |
default:
|
412 |
DPRINTF("Unexpected write (len %zd)\n", p->iov.size);
|
413 |
goto fail;
|
414 |
} |
415 |
break;
|
416 |
|
417 |
case USB_TOKEN_IN:
|
418 |
if (devep != 1) |
419 |
goto fail;
|
420 |
|
421 |
switch (s->mode) {
|
422 |
case USB_MSDM_DATAOUT:
|
423 |
if (s->data_len != 0 || p->iov.size < 13) { |
424 |
goto fail;
|
425 |
} |
426 |
/* Waiting for SCSI write to complete. */
|
427 |
s->packet = p; |
428 |
ret = USB_RET_ASYNC; |
429 |
break;
|
430 |
|
431 |
case USB_MSDM_CSW:
|
432 |
DPRINTF("Command status %d tag 0x%x, len %zd\n",
|
433 |
s->result, s->tag, p->iov.size); |
434 |
if (p->iov.size < 13) { |
435 |
goto fail;
|
436 |
} |
437 |
|
438 |
usb_msd_send_status(s, p); |
439 |
s->mode = USB_MSDM_CBW; |
440 |
ret = 13;
|
441 |
break;
|
442 |
|
443 |
case USB_MSDM_DATAIN:
|
444 |
DPRINTF("Data in %zd/%d, scsi_len %d\n",
|
445 |
p->iov.size, s->data_len, s->scsi_len); |
446 |
if (s->scsi_len) {
|
447 |
usb_msd_copy_data(s, p); |
448 |
} |
449 |
if (s->residue) {
|
450 |
int len = p->iov.size - p->result;
|
451 |
if (len) {
|
452 |
usb_packet_skip(p, len); |
453 |
s->data_len -= len; |
454 |
if (s->data_len == 0) { |
455 |
s->mode = USB_MSDM_CSW; |
456 |
} |
457 |
} |
458 |
} |
459 |
if (p->result < p->iov.size) {
|
460 |
DPRINTF("Deferring packet %p\n", p);
|
461 |
s->packet = p; |
462 |
ret = USB_RET_ASYNC; |
463 |
} else {
|
464 |
ret = p->result; |
465 |
} |
466 |
break;
|
467 |
|
468 |
default:
|
469 |
DPRINTF("Unexpected read (len %zd)\n", p->iov.size);
|
470 |
goto fail;
|
471 |
} |
472 |
break;
|
473 |
|
474 |
default:
|
475 |
DPRINTF("Bad token\n");
|
476 |
fail:
|
477 |
ret = USB_RET_STALL; |
478 |
break;
|
479 |
} |
480 |
|
481 |
return ret;
|
482 |
} |
483 |
|
484 |
static void usb_msd_password_cb(void *opaque, int err) |
485 |
{ |
486 |
MSDState *s = opaque; |
487 |
|
488 |
if (!err)
|
489 |
err = usb_device_attach(&s->dev); |
490 |
|
491 |
if (err)
|
492 |
qdev_unplug(&s->dev.qdev); |
493 |
} |
494 |
|
495 |
static const struct SCSIBusOps usb_msd_scsi_ops = { |
496 |
.transfer_data = usb_msd_transfer_data, |
497 |
.complete = usb_msd_command_complete, |
498 |
.cancel = usb_msd_request_cancelled |
499 |
}; |
500 |
|
501 |
static int usb_msd_initfn(USBDevice *dev) |
502 |
{ |
503 |
MSDState *s = DO_UPCAST(MSDState, dev, dev); |
504 |
BlockDriverState *bs = s->conf.bs; |
505 |
DriveInfo *dinfo; |
506 |
|
507 |
if (!bs) {
|
508 |
error_report("usb-msd: drive property not set");
|
509 |
return -1; |
510 |
} |
511 |
|
512 |
/*
|
513 |
* Hack alert: this pretends to be a block device, but it's really
|
514 |
* a SCSI bus that can serve only a single device, which it
|
515 |
* creates automatically. But first it needs to detach from its
|
516 |
* blockdev, or else scsi_bus_legacy_add_drive() dies when it
|
517 |
* attaches again.
|
518 |
*
|
519 |
* The hack is probably a bad idea.
|
520 |
*/
|
521 |
bdrv_detach(bs, &s->dev.qdev); |
522 |
s->conf.bs = NULL;
|
523 |
|
524 |
if (!s->serial) {
|
525 |
/* try to fall back to value set with legacy -drive serial=... */
|
526 |
dinfo = drive_get_by_blockdev(bs); |
527 |
if (*dinfo->serial) {
|
528 |
s->serial = strdup(dinfo->serial); |
529 |
} |
530 |
} |
531 |
if (s->serial) {
|
532 |
usb_desc_set_string(dev, STR_SERIALNUMBER, s->serial); |
533 |
} |
534 |
|
535 |
usb_desc_init(dev); |
536 |
scsi_bus_new(&s->bus, &s->dev.qdev, 0, 1, &usb_msd_scsi_ops); |
537 |
s->scsi_dev = scsi_bus_legacy_add_drive(&s->bus, bs, 0, !!s->removable);
|
538 |
if (!s->scsi_dev) {
|
539 |
return -1; |
540 |
} |
541 |
s->bus.qbus.allow_hotplug = 0;
|
542 |
usb_msd_handle_reset(dev); |
543 |
|
544 |
if (bdrv_key_required(bs)) {
|
545 |
if (cur_mon) {
|
546 |
monitor_read_bdrv_key_start(cur_mon, bs, usb_msd_password_cb, s); |
547 |
s->dev.auto_attach = 0;
|
548 |
} else {
|
549 |
autostart = 0;
|
550 |
} |
551 |
} |
552 |
|
553 |
add_boot_device_path(s->conf.bootindex, &dev->qdev, "/disk@0,0");
|
554 |
return 0; |
555 |
} |
556 |
|
557 |
static USBDevice *usb_msd_init(const char *filename) |
558 |
{ |
559 |
static int nr=0; |
560 |
char id[8]; |
561 |
QemuOpts *opts; |
562 |
DriveInfo *dinfo; |
563 |
USBDevice *dev; |
564 |
const char *p1; |
565 |
char fmt[32]; |
566 |
|
567 |
/* parse -usbdevice disk: syntax into drive opts */
|
568 |
snprintf(id, sizeof(id), "usb%d", nr++); |
569 |
opts = qemu_opts_create(qemu_find_opts("drive"), id, 0); |
570 |
|
571 |
p1 = strchr(filename, ':');
|
572 |
if (p1++) {
|
573 |
const char *p2; |
574 |
|
575 |
if (strstart(filename, "format=", &p2)) { |
576 |
int len = MIN(p1 - p2, sizeof(fmt)); |
577 |
pstrcpy(fmt, len, p2); |
578 |
qemu_opt_set(opts, "format", fmt);
|
579 |
} else if (*filename != ':') { |
580 |
printf("unrecognized USB mass-storage option %s\n", filename);
|
581 |
return NULL; |
582 |
} |
583 |
filename = p1; |
584 |
} |
585 |
if (!*filename) {
|
586 |
printf("block device specification needed\n");
|
587 |
return NULL; |
588 |
} |
589 |
qemu_opt_set(opts, "file", filename);
|
590 |
qemu_opt_set(opts, "if", "none"); |
591 |
|
592 |
/* create host drive */
|
593 |
dinfo = drive_init(opts, 0);
|
594 |
if (!dinfo) {
|
595 |
qemu_opts_del(opts); |
596 |
return NULL; |
597 |
} |
598 |
|
599 |
/* create guest device */
|
600 |
dev = usb_create(NULL /* FIXME */, "usb-storage"); |
601 |
if (!dev) {
|
602 |
return NULL; |
603 |
} |
604 |
if (qdev_prop_set_drive(&dev->qdev, "drive", dinfo->bdrv) < 0) { |
605 |
qdev_free(&dev->qdev); |
606 |
return NULL; |
607 |
} |
608 |
if (qdev_init(&dev->qdev) < 0) |
609 |
return NULL; |
610 |
|
611 |
return dev;
|
612 |
} |
613 |
|
614 |
static const VMStateDescription vmstate_usb_msd = { |
615 |
.name = "usb-storage",
|
616 |
.unmigratable = 1, /* FIXME: handle transactions which are in flight */ |
617 |
.version_id = 1,
|
618 |
.minimum_version_id = 1,
|
619 |
.fields = (VMStateField []) { |
620 |
VMSTATE_USB_DEVICE(dev, MSDState), |
621 |
VMSTATE_END_OF_LIST() |
622 |
} |
623 |
}; |
624 |
|
625 |
static struct USBDeviceInfo msd_info = { |
626 |
.product_desc = "QEMU USB MSD",
|
627 |
.qdev.name = "usb-storage",
|
628 |
.qdev.fw_name = "storage",
|
629 |
.qdev.size = sizeof(MSDState),
|
630 |
.qdev.vmsd = &vmstate_usb_msd, |
631 |
.usb_desc = &desc, |
632 |
.init = usb_msd_initfn, |
633 |
.handle_packet = usb_generic_handle_packet, |
634 |
.cancel_packet = usb_msd_cancel_io, |
635 |
.handle_attach = usb_desc_attach, |
636 |
.handle_reset = usb_msd_handle_reset, |
637 |
.handle_control = usb_msd_handle_control, |
638 |
.handle_data = usb_msd_handle_data, |
639 |
.usbdevice_name = "disk",
|
640 |
.usbdevice_init = usb_msd_init, |
641 |
.qdev.props = (Property[]) { |
642 |
DEFINE_BLOCK_PROPERTIES(MSDState, conf), |
643 |
DEFINE_PROP_STRING("serial", MSDState, serial),
|
644 |
DEFINE_PROP_BIT("removable", MSDState, removable, 0, false), |
645 |
DEFINE_PROP_END_OF_LIST(), |
646 |
}, |
647 |
}; |
648 |
|
649 |
static void usb_msd_register_devices(void) |
650 |
{ |
651 |
usb_qdev_register(&msd_info); |
652 |
} |
653 |
device_init(usb_msd_register_devices) |