root / hw / usb-msd.c @ 2bac6019
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| 1 |
/*
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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 licenced under the LGPL.
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*/
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#include "vl.h" |
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|
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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, args...) \
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do { printf("usb-msd: " fmt , ##args); } while (0) |
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#else
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#define DPRINTF(fmt, args...) 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, /* 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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|
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typedef struct { |
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USBDevice dev; |
| 34 |
enum USBMSDMode mode;
|
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uint32_t scsi_len; |
| 36 |
uint8_t *scsi_buf; |
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uint32_t usb_len; |
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uint8_t *usb_buf; |
| 39 |
uint32_t data_len; |
| 40 |
uint32_t residue; |
| 41 |
uint32_t tag; |
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BlockDriverState *bs; |
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SCSIDevice *scsi_dev; |
| 44 |
int result;
|
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/* For async completion. */
|
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USBPacket *packet; |
| 47 |
} 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; |
| 53 |
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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}; |
| 58 |
|
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struct usb_msd_csw {
|
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uint32_t sig; |
| 61 |
uint32_t tag; |
| 62 |
uint32_t residue; |
| 63 |
uint8_t status; |
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}; |
| 65 |
|
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static const uint8_t qemu_msd_dev_descriptor[] = { |
| 67 |
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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|
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0x00, /* u8 bDeviceClass; */ |
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0x00, /* u8 bDeviceSubClass; */ |
| 73 |
0x00, /* u8 bDeviceProtocol; [ low/full speeds only ] */ |
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0x08, /* u8 bMaxPacketSize0; 8 Bytes */ |
| 75 |
|
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/* Vendor and product id are arbitrary. */
|
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0x00, 0x00, /* u16 idVendor; */ |
| 78 |
0x00, 0x00, /* u16 idProduct; */ |
| 79 |
0x00, 0x00, /* u16 bcdDevice */ |
| 80 |
|
| 81 |
0x01, /* u8 iManufacturer; */ |
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0x02, /* u8 iProduct; */ |
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0x03, /* u8 iSerialNumber; */ |
| 84 |
0x01 /* u8 bNumConfigurations; */ |
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}; |
| 86 |
|
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static const uint8_t qemu_msd_config_descriptor[] = { |
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|
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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; */ |
| 102 |
|
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/* one interface */
|
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0x09, /* u8 if_bLength; */ |
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0x04, /* u8 if_bDescriptorType; Interface */ |
| 106 |
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 */ |
| 111 |
0x50, /* u8 if_bInterfaceProtocol; Bulk Only */ |
| 112 |
0x00, /* u8 if_iInterface; */ |
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|
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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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|
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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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|
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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; |
| 137 |
if (s->mode == USB_MSDM_DATAIN) {
|
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memcpy(s->usb_buf, s->scsi_buf, len); |
| 139 |
} else {
|
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memcpy(s->scsi_buf, s->usb_buf, len); |
| 141 |
} |
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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; |
| 147 |
if (s->scsi_len == 0) { |
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if (s->mode == USB_MSDM_DATAIN) {
|
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scsi_read_data(s->scsi_dev, s->tag); |
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} else if (s->mode == USB_MSDM_DATAOUT) { |
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scsi_write_data(s->scsi_dev, s->tag); |
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} |
| 153 |
} |
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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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|
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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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} |
| 166 |
|
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static void usb_msd_command_complete(void *opaque, int reason, uint32_t tag, |
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uint32_t arg) |
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{
|
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MSDState *s = (MSDState *)opaque; |
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USBPacket *p = s->packet; |
| 172 |
|
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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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} |
| 176 |
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) {
|
| 181 |
if (s->data_len == 0 && s->mode == USB_MSDM_DATAOUT) { |
| 182 |
/* A deferred packet with no write data remaining must be
|
| 183 |
the status read packet. */
|
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usb_msd_send_status(s); |
| 185 |
s->mode = USB_MSDM_CBW; |
| 186 |
} else {
|
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if (s->data_len) {
|
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s->data_len -= s->usb_len; |
| 189 |
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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} |
| 193 |
if (s->data_len == 0) |
| 194 |
s->mode = USB_MSDM_CSW; |
| 195 |
} |
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s->packet = NULL;
|
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usb_packet_complete(p); |
| 198 |
} else if (s->data_len == 0) { |
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s->mode = USB_MSDM_CSW; |
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} |
| 201 |
return;
|
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} |
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s->scsi_len = arg; |
| 204 |
s->scsi_buf = scsi_get_buf(s->scsi_dev, tag); |
| 205 |
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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|
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static void usb_msd_handle_reset(USBDevice *dev) |
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{
|
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MSDState *s = (MSDState *)dev; |
| 221 |
|
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DPRINTF("Reset\n");
|
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s->mode = USB_MSDM_CBW; |
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} |
| 225 |
|
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static int usb_msd_handle_control(USBDevice *dev, int request, int value, |
| 227 |
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; |
| 231 |
|
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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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} |
| 245 |
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; |
| 257 |
ret = 0;
|
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break;
|
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case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
|
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switch(value >> 8) { |
| 261 |
case USB_DT_DEVICE:
|
| 262 |
memcpy(data, qemu_msd_dev_descriptor, |
| 263 |
sizeof(qemu_msd_dev_descriptor));
|
| 264 |
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, |
| 268 |
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) { |
| 273 |
case 0: |
| 274 |
/* language ids */
|
| 275 |
data[0] = 4; |
| 276 |
data[1] = 3; |
| 277 |
data[2] = 0x09; |
| 278 |
data[3] = 0x04; |
| 279 |
ret = 4;
|
| 280 |
break;
|
| 281 |
case 1: |
| 282 |
/* vendor description */
|
| 283 |
ret = set_usb_string(data, "QEMU " QEMU_VERSION);
|
| 284 |
break;
|
| 285 |
case 2: |
| 286 |
/* product description */
|
| 287 |
ret = set_usb_string(data, "QEMU USB HARDDRIVE");
|
| 288 |
break;
|
| 289 |
case 3: |
| 290 |
/* serial number */
|
| 291 |
ret = set_usb_string(data, "1");
|
| 292 |
break;
|
| 293 |
default:
|
| 294 |
goto fail;
|
| 295 |
} |
| 296 |
break;
|
| 297 |
default:
|
| 298 |
goto fail;
|
| 299 |
} |
| 300 |
break;
|
| 301 |
case DeviceRequest | USB_REQ_GET_CONFIGURATION:
|
| 302 |
data[0] = 1; |
| 303 |
ret = 1;
|
| 304 |
break;
|
| 305 |
case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
|
| 306 |
ret = 0;
|
| 307 |
break;
|
| 308 |
case DeviceRequest | USB_REQ_GET_INTERFACE:
|
| 309 |
data[0] = 0; |
| 310 |
ret = 1;
|
| 311 |
break;
|
| 312 |
case DeviceOutRequest | USB_REQ_SET_INTERFACE:
|
| 313 |
ret = 0;
|
| 314 |
break;
|
| 315 |
case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
|
| 316 |
if (value == 0 && index != 0x81) { /* clear ep halt */ |
| 317 |
goto fail;
|
| 318 |
} |
| 319 |
ret = 0;
|
| 320 |
break;
|
| 321 |
/* Class specific requests. */
|
| 322 |
case MassStorageReset:
|
| 323 |
/* Reset state ready for the next CBW. */
|
| 324 |
s->mode = USB_MSDM_CBW; |
| 325 |
ret = 0;
|
| 326 |
break;
|
| 327 |
case GetMaxLun:
|
| 328 |
data[0] = 0; |
| 329 |
ret = 1;
|
| 330 |
break;
|
| 331 |
default:
|
| 332 |
fail:
|
| 333 |
ret = USB_RET_STALL; |
| 334 |
break;
|
| 335 |
} |
| 336 |
return ret;
|
| 337 |
} |
| 338 |
|
| 339 |
static void usb_msd_cancel_io(USBPacket *p, void *opaque) |
| 340 |
{
|
| 341 |
MSDState *s = opaque; |
| 342 |
scsi_cancel_io(s->scsi_dev, s->tag); |
| 343 |
s->packet = NULL;
|
| 344 |
s->scsi_len = 0;
|
| 345 |
} |
| 346 |
|
| 347 |
static int usb_msd_handle_data(USBDevice *dev, USBPacket *p) |
| 348 |
{
|
| 349 |
MSDState *s = (MSDState *)dev; |
| 350 |
int ret = 0; |
| 351 |
struct usb_msd_cbw cbw;
|
| 352 |
uint8_t devep = p->devep; |
| 353 |
uint8_t *data = p->data; |
| 354 |
int len = p->len;
|
| 355 |
|
| 356 |
switch (p->pid) {
|
| 357 |
case USB_TOKEN_OUT:
|
| 358 |
if (devep != 2) |
| 359 |
goto fail;
|
| 360 |
|
| 361 |
switch (s->mode) {
|
| 362 |
case USB_MSDM_CBW:
|
| 363 |
if (len != 31) { |
| 364 |
fprintf(stderr, "usb-msd: Bad CBW size");
|
| 365 |
goto fail;
|
| 366 |
} |
| 367 |
memcpy(&cbw, data, 31);
|
| 368 |
if (le32_to_cpu(cbw.sig) != 0x43425355) { |
| 369 |
fprintf(stderr, "usb-msd: Bad signature %08x\n",
|
| 370 |
le32_to_cpu(cbw.sig)); |
| 371 |
goto fail;
|
| 372 |
} |
| 373 |
DPRINTF("Command on LUN %d\n", cbw.lun);
|
| 374 |
if (cbw.lun != 0) { |
| 375 |
fprintf(stderr, "usb-msd: Bad LUN %d\n", cbw.lun);
|
| 376 |
goto fail;
|
| 377 |
} |
| 378 |
s->tag = le32_to_cpu(cbw.tag); |
| 379 |
s->data_len = le32_to_cpu(cbw.data_len); |
| 380 |
if (s->data_len == 0) { |
| 381 |
s->mode = USB_MSDM_CSW; |
| 382 |
} else if (cbw.flags & 0x80) { |
| 383 |
s->mode = USB_MSDM_DATAIN; |
| 384 |
} else {
|
| 385 |
s->mode = USB_MSDM_DATAOUT; |
| 386 |
} |
| 387 |
DPRINTF("Command tag 0x%x flags %08x len %d data %d\n",
|
| 388 |
s->tag, cbw.flags, cbw.cmd_len, s->data_len); |
| 389 |
s->residue = 0;
|
| 390 |
scsi_send_command(s->scsi_dev, s->tag, cbw.cmd, 0);
|
| 391 |
/* ??? Should check that USB and SCSI data transfer
|
| 392 |
directions match. */
|
| 393 |
if (s->residue == 0) { |
| 394 |
if (s->mode == USB_MSDM_DATAIN) {
|
| 395 |
scsi_read_data(s->scsi_dev, s->tag); |
| 396 |
} else if (s->mode == USB_MSDM_DATAOUT) { |
| 397 |
scsi_write_data(s->scsi_dev, s->tag); |
| 398 |
} |
| 399 |
} |
| 400 |
ret = len; |
| 401 |
break;
|
| 402 |
|
| 403 |
case USB_MSDM_DATAOUT:
|
| 404 |
DPRINTF("Data out %d/%d\n", len, s->data_len);
|
| 405 |
if (len > s->data_len)
|
| 406 |
goto fail;
|
| 407 |
|
| 408 |
s->usb_buf = data; |
| 409 |
s->usb_len = len; |
| 410 |
if (s->scsi_len) {
|
| 411 |
usb_msd_copy_data(s); |
| 412 |
} |
| 413 |
if (s->residue && s->usb_len) {
|
| 414 |
s->data_len -= s->usb_len; |
| 415 |
if (s->data_len == 0) |
| 416 |
s->mode = USB_MSDM_CSW; |
| 417 |
s->usb_len = 0;
|
| 418 |
} |
| 419 |
if (s->usb_len) {
|
| 420 |
DPRINTF("Deferring packet %p\n", p);
|
| 421 |
usb_defer_packet(p, usb_msd_cancel_io, s); |
| 422 |
s->packet = p; |
| 423 |
ret = USB_RET_ASYNC; |
| 424 |
} else {
|
| 425 |
ret = len; |
| 426 |
} |
| 427 |
break;
|
| 428 |
|
| 429 |
default:
|
| 430 |
DPRINTF("Unexpected write (len %d)\n", len);
|
| 431 |
goto fail;
|
| 432 |
} |
| 433 |
break;
|
| 434 |
|
| 435 |
case USB_TOKEN_IN:
|
| 436 |
if (devep != 1) |
| 437 |
goto fail;
|
| 438 |
|
| 439 |
switch (s->mode) {
|
| 440 |
case USB_MSDM_DATAOUT:
|
| 441 |
if (s->data_len != 0 || len < 13) |
| 442 |
goto fail;
|
| 443 |
/* Waiting for SCSI write to complete. */
|
| 444 |
usb_defer_packet(p, usb_msd_cancel_io, s); |
| 445 |
s->packet = p; |
| 446 |
ret = USB_RET_ASYNC; |
| 447 |
break;
|
| 448 |
|
| 449 |
case USB_MSDM_CSW:
|
| 450 |
DPRINTF("Command status %d tag 0x%x, len %d\n",
|
| 451 |
s->result, s->tag, len); |
| 452 |
if (len < 13) |
| 453 |
goto fail;
|
| 454 |
|
| 455 |
s->usb_len = len; |
| 456 |
s->usb_buf = data; |
| 457 |
usb_msd_send_status(s); |
| 458 |
s->mode = USB_MSDM_CBW; |
| 459 |
ret = 13;
|
| 460 |
break;
|
| 461 |
|
| 462 |
case USB_MSDM_DATAIN:
|
| 463 |
DPRINTF("Data in %d/%d\n", len, s->data_len);
|
| 464 |
if (len > s->data_len)
|
| 465 |
len = s->data_len; |
| 466 |
s->usb_buf = data; |
| 467 |
s->usb_len = len; |
| 468 |
if (s->scsi_len) {
|
| 469 |
usb_msd_copy_data(s); |
| 470 |
} |
| 471 |
if (s->residue && s->usb_len) {
|
| 472 |
s->data_len -= s->usb_len; |
| 473 |
memset(s->usb_buf, 0, s->usb_len);
|
| 474 |
if (s->data_len == 0) |
| 475 |
s->mode = USB_MSDM_CSW; |
| 476 |
s->usb_len = 0;
|
| 477 |
} |
| 478 |
if (s->usb_len) {
|
| 479 |
DPRINTF("Deferring packet %p\n", p);
|
| 480 |
usb_defer_packet(p, usb_msd_cancel_io, s); |
| 481 |
s->packet = p; |
| 482 |
ret = USB_RET_ASYNC; |
| 483 |
} else {
|
| 484 |
ret = len; |
| 485 |
} |
| 486 |
break;
|
| 487 |
|
| 488 |
default:
|
| 489 |
DPRINTF("Unexpected read (len %d)\n", len);
|
| 490 |
goto fail;
|
| 491 |
} |
| 492 |
break;
|
| 493 |
|
| 494 |
default:
|
| 495 |
DPRINTF("Bad token\n");
|
| 496 |
fail:
|
| 497 |
ret = USB_RET_STALL; |
| 498 |
break;
|
| 499 |
} |
| 500 |
|
| 501 |
return ret;
|
| 502 |
} |
| 503 |
|
| 504 |
static void usb_msd_handle_destroy(USBDevice *dev) |
| 505 |
{
|
| 506 |
MSDState *s = (MSDState *)dev; |
| 507 |
|
| 508 |
scsi_disk_destroy(s->scsi_dev); |
| 509 |
bdrv_delete(s->bs); |
| 510 |
qemu_free(s); |
| 511 |
} |
| 512 |
|
| 513 |
USBDevice *usb_msd_init(const char *filename) |
| 514 |
{
|
| 515 |
MSDState *s; |
| 516 |
BlockDriverState *bdrv; |
| 517 |
|
| 518 |
s = qemu_mallocz(sizeof(MSDState));
|
| 519 |
if (!s)
|
| 520 |
return NULL; |
| 521 |
|
| 522 |
bdrv = bdrv_new("usb");
|
| 523 |
if (bdrv_open(bdrv, filename, 0) < 0) |
| 524 |
goto fail;
|
| 525 |
if (qemu_key_check(bdrv, filename))
|
| 526 |
goto fail;
|
| 527 |
s->bs = bdrv; |
| 528 |
|
| 529 |
s->dev.speed = USB_SPEED_FULL; |
| 530 |
s->dev.handle_packet = usb_generic_handle_packet; |
| 531 |
|
| 532 |
s->dev.handle_reset = usb_msd_handle_reset; |
| 533 |
s->dev.handle_control = usb_msd_handle_control; |
| 534 |
s->dev.handle_data = usb_msd_handle_data; |
| 535 |
s->dev.handle_destroy = usb_msd_handle_destroy; |
| 536 |
|
| 537 |
snprintf(s->dev.devname, sizeof(s->dev.devname), "QEMU USB MSD(%.16s)", |
| 538 |
filename); |
| 539 |
|
| 540 |
s->scsi_dev = scsi_disk_init(bdrv, 0, usb_msd_command_complete, s);
|
| 541 |
usb_msd_handle_reset((USBDevice *)s); |
| 542 |
return (USBDevice *)s;
|
| 543 |
fail:
|
| 544 |
qemu_free(s); |
| 545 |
return NULL; |
| 546 |
} |