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qemu/hw/usb/dev-storage.c
Luiz Capitulino 56f9107e43 qdev: qdev_unplug(): use error_set() 
It currently uses qerror_report(), but next commit will convert
the drive_del command to the QAPI and this requires using
error_set().

One particularity of qerror_report() is that it knows when it's
running on monitor context or command-line context and prints the
error message accordingly. error_set() doesn't do this, so we
have to be careful not to drop error messages.

qdev_unplug() has three kinds of usages:

 1. It's called when hot adding a device fails, to undo anything
    that has been done before hitting the error

 2. It's called by function monitor functions like device_del(),
    to unplug a device

 3. It's used by xen_platform.c in a way that doesn't _seem_ to
    be in monitor context

Only item 2 can print an error message to the user, this commit
maintains that.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2012-04-09 14:35:25 -03:00

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