mirror of https://gitee.com/openkylin/qemu.git
614 lines
17 KiB
C
614 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 "block.h"
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#include "scsi-disk.h"
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#include "console.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, /* Tranfer 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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SCSIBus bus;
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DriveInfo *dinfo;
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SCSIDevice *scsi_dev;
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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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static const uint8_t qemu_msd_dev_descriptor[] = {
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0x12, /* u8 bLength; */
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0x01, /* u8 bDescriptorType; Device */
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0x00, 0x01, /* u16 bcdUSB; v1.0 */
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0x00, /* u8 bDeviceClass; */
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0x00, /* u8 bDeviceSubClass; */
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0x00, /* u8 bDeviceProtocol; [ low/full speeds only ] */
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0x08, /* u8 bMaxPacketSize0; 8 Bytes */
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/* Vendor and product id are arbitrary. */
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0x00, 0x00, /* u16 idVendor; */
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0x00, 0x00, /* u16 idProduct; */
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0x00, 0x00, /* u16 bcdDevice */
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0x01, /* u8 iManufacturer; */
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0x02, /* u8 iProduct; */
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0x03, /* u8 iSerialNumber; */
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0x01 /* u8 bNumConfigurations; */
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};
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static const uint8_t qemu_msd_config_descriptor[] = {
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/* one configuration */
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0x09, /* u8 bLength; */
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0x02, /* u8 bDescriptorType; Configuration */
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0x20, 0x00, /* u16 wTotalLength; */
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0x01, /* u8 bNumInterfaces; (1) */
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0x01, /* u8 bConfigurationValue; */
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0x00, /* u8 iConfiguration; */
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0xc0, /* u8 bmAttributes;
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Bit 7: must be set,
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6: Self-powered,
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5: Remote wakeup,
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4..0: resvd */
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0x00, /* u8 MaxPower; */
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/* one interface */
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0x09, /* u8 if_bLength; */
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0x04, /* u8 if_bDescriptorType; Interface */
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0x00, /* u8 if_bInterfaceNumber; */
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0x00, /* u8 if_bAlternateSetting; */
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0x02, /* u8 if_bNumEndpoints; */
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0x08, /* u8 if_bInterfaceClass; MASS STORAGE */
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0x06, /* u8 if_bInterfaceSubClass; SCSI */
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0x50, /* u8 if_bInterfaceProtocol; Bulk Only */
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0x00, /* u8 if_iInterface; */
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/* Bulk-In endpoint */
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0x07, /* u8 ep_bLength; */
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0x05, /* u8 ep_bDescriptorType; Endpoint */
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0x81, /* u8 ep_bEndpointAddress; IN Endpoint 1 */
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0x02, /* u8 ep_bmAttributes; Bulk */
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0x40, 0x00, /* u16 ep_wMaxPacketSize; */
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0x00, /* u8 ep_bInterval; */
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/* Bulk-Out endpoint */
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0x07, /* u8 ep_bLength; */
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0x05, /* u8 ep_bDescriptorType; Endpoint */
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0x02, /* u8 ep_bEndpointAddress; OUT Endpoint 2 */
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0x02, /* u8 ep_bmAttributes; Bulk */
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0x40, 0x00, /* u16 ep_wMaxPacketSize; */
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0x00 /* u8 ep_bInterval; */
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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) {
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if (s->mode == USB_MSDM_DATAIN) {
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s->scsi_dev->info->read_data(s->scsi_dev, s->tag);
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} else if (s->mode == USB_MSDM_DATAOUT) {
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s->scsi_dev->info->write_data(s->scsi_dev, s->tag);
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}
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}
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}
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static void usb_msd_send_status(MSDState *s)
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{
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struct usb_msd_csw csw;
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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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memcpy(s->usb_buf, &csw, 13);
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}
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static void usb_msd_command_complete(SCSIBus *bus, int reason, uint32_t tag,
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uint32_t arg)
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{
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MSDState *s = DO_UPCAST(MSDState, dev.qdev, bus->qbus.parent);
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USBPacket *p = s->packet;
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if (tag != s->tag) {
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fprintf(stderr, "usb-msd: Unexpected SCSI Tag 0x%x\n", 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);
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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(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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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(s->scsi_dev, tag);
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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 annother 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(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 = 0;
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switch (request) {
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case DeviceRequest | USB_REQ_GET_STATUS:
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data[0] = (1 << USB_DEVICE_SELF_POWERED) |
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(dev->remote_wakeup << USB_DEVICE_REMOTE_WAKEUP);
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data[1] = 0x00;
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ret = 2;
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break;
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case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
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if (value == USB_DEVICE_REMOTE_WAKEUP) {
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dev->remote_wakeup = 0;
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} else {
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goto fail;
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}
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ret = 0;
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break;
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case DeviceOutRequest | USB_REQ_SET_FEATURE:
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if (value == USB_DEVICE_REMOTE_WAKEUP) {
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dev->remote_wakeup = 1;
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} else {
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goto fail;
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}
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ret = 0;
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break;
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case DeviceOutRequest | USB_REQ_SET_ADDRESS:
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dev->addr = value;
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ret = 0;
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break;
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case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
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switch(value >> 8) {
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case USB_DT_DEVICE:
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memcpy(data, qemu_msd_dev_descriptor,
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sizeof(qemu_msd_dev_descriptor));
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ret = sizeof(qemu_msd_dev_descriptor);
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break;
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case USB_DT_CONFIG:
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memcpy(data, qemu_msd_config_descriptor,
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sizeof(qemu_msd_config_descriptor));
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ret = sizeof(qemu_msd_config_descriptor);
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break;
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case USB_DT_STRING:
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switch(value & 0xff) {
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case 0:
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/* language ids */
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data[0] = 4;
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data[1] = 3;
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data[2] = 0x09;
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data[3] = 0x04;
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ret = 4;
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break;
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case 1:
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/* vendor description */
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ret = set_usb_string(data, "QEMU " QEMU_VERSION);
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break;
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case 2:
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/* product description */
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ret = set_usb_string(data, "QEMU USB HARDDRIVE");
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break;
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case 3:
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/* serial number */
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ret = set_usb_string(data, "1");
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break;
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default:
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goto fail;
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}
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break;
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default:
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goto fail;
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}
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break;
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case DeviceRequest | USB_REQ_GET_CONFIGURATION:
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data[0] = 1;
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ret = 1;
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break;
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case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
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ret = 0;
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break;
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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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if (value == 0 && index != 0x81) { /* clear ep halt */
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goto fail;
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}
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ret = 0;
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break;
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/* Class specific requests. */
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case 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 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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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_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->scsi_dev, s->tag);
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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_dev->info->send_command(s->scsi_dev, s->tag, cbw.cmd, 0);
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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->scsi_dev, s->tag);
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} else if (s->mode == USB_MSDM_DATAOUT) {
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s->scsi_dev->info->write_data(s->scsi_dev, s->tag);
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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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s->usb_len = len;
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s->usb_buf = data;
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usb_msd_send_status(s);
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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\n", len, s->data_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_handle_destroy(USBDevice *dev)
|
|
{
|
|
MSDState *s = (MSDState *)dev;
|
|
|
|
drive_uninit(s->dinfo->bdrv);
|
|
}
|
|
|
|
static int usb_msd_initfn(USBDevice *dev)
|
|
{
|
|
MSDState *s = DO_UPCAST(MSDState, dev, dev);
|
|
|
|
if (!s->dinfo || !s->dinfo->bdrv) {
|
|
qemu_error("usb-msd: drive property not set\n");
|
|
return -1;
|
|
}
|
|
|
|
s->dev.speed = USB_SPEED_FULL;
|
|
scsi_bus_new(&s->bus, &s->dev.qdev, 0, 1, usb_msd_command_complete);
|
|
s->scsi_dev = scsi_bus_legacy_add_drive(&s->bus, s->dinfo, 0);
|
|
s->bus.qbus.allow_hotplug = 0;
|
|
usb_msd_handle_reset(dev);
|
|
return 0;
|
|
}
|
|
|
|
USBDevice *usb_msd_init(const char *filename)
|
|
{
|
|
static int nr=0;
|
|
char id[8];
|
|
QemuOpts *opts;
|
|
DriveInfo *dinfo;
|
|
USBDevice *dev;
|
|
int fatal_error;
|
|
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_drive_opts, 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, NULL, &fatal_error);
|
|
if (!dinfo) {
|
|
qemu_opts_del(opts);
|
|
return NULL;
|
|
}
|
|
|
|
/* create guest device */
|
|
dev = usb_create(NULL /* FIXME */, "QEMU USB MSD");
|
|
qdev_prop_set_drive(&dev->qdev, "drive", dinfo);
|
|
qdev_init(&dev->qdev);
|
|
|
|
return dev;
|
|
}
|
|
|
|
BlockDriverState *usb_msd_get_bdrv(USBDevice *dev)
|
|
{
|
|
MSDState *s = (MSDState *)dev;
|
|
|
|
return s->dinfo->bdrv;
|
|
}
|
|
|
|
static struct USBDeviceInfo msd_info = {
|
|
.qdev.name = "QEMU USB MSD",
|
|
.qdev.alias = "usb-storage",
|
|
.qdev.size = sizeof(MSDState),
|
|
.init = usb_msd_initfn,
|
|
.handle_packet = usb_generic_handle_packet,
|
|
.handle_reset = usb_msd_handle_reset,
|
|
.handle_control = usb_msd_handle_control,
|
|
.handle_data = usb_msd_handle_data,
|
|
.handle_destroy = usb_msd_handle_destroy,
|
|
.qdev.props = (Property[]) {
|
|
DEFINE_PROP_DRIVE("drive", MSDState, dinfo),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
},
|
|
};
|
|
|
|
static void usb_msd_register_devices(void)
|
|
{
|
|
usb_qdev_register(&msd_info);
|
|
}
|
|
device_init(usb_msd_register_devices)
|