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qemu-e2k/hw/usb/dev-uas.c
Markus Armbruster b69c3c21a5 qdev: Unrealize must not fail 
Devices may have component devices and buses.

Device realization may fail.  Realization is recursive: a device's
realize() method realizes its components, and device_set_realized()
realizes its buses (which should in turn realize the devices on that
bus, except bus_set_realized() doesn't implement that, yet).

When realization of a component or bus fails, we need to roll back:
unrealize everything we realized so far.  If any of these unrealizes
failed, the device would be left in an inconsistent state.  Must not
happen.

device_set_realized() lets it happen: it ignores errors in the roll
back code starting at label child_realize_fail.

Since realization is recursive, unrealization must be recursive, too.
But how could a partly failed unrealize be rolled back?  We'd have to
re-realize, which can fail.  This design is fundamentally broken.

device_set_realized() does not roll back at all.  Instead, it keeps
unrealizing, ignoring further errors.

It can screw up even for a device with no buses: if the lone
dc->unrealize() fails, it still unregisters vmstate, and calls
listeners' unrealize() callback.

bus_set_realized() does not roll back either.  Instead, it stops
unrealizing.

Fortunately, no unrealize method can fail, as we'll see below.

To fix the design error, drop parameter @errp from all the unrealize
methods.

Any unrealize method that uses @errp now needs an update.  This leads
us to unrealize() methods that can fail.  Merely passing it to another
unrealize method cannot cause failure, though.  Here are the ones that
do other things with @errp:

* virtio_serial_device_unrealize()

  Fails when qbus_set_hotplug_handler() fails, but still does all the
  other work.  On failure, the device would stay realized with its
  resources completely gone.  Oops.  Can't happen, because
  qbus_set_hotplug_handler() can't actually fail here.  Pass
  &error_abort to qbus_set_hotplug_handler() instead.

* hw/ppc/spapr_drc.c's unrealize()

  Fails when object_property_del() fails, but all the other work is
  already done.  On failure, the device would stay realized with its
  vmstate registration gone.  Oops.  Can't happen, because
  object_property_del() can't actually fail here.  Pass &error_abort
  to object_property_del() instead.

* spapr_phb_unrealize()

  Fails and bails out when remove_drcs() fails, but other work is
  already done.  On failure, the device would stay realized with some
  of its resources gone.  Oops.  remove_drcs() fails only when
  chassis_from_bus()'s object_property_get_uint() fails, and it can't
  here.  Pass &error_abort to remove_drcs() instead.

Therefore, no unrealize method can fail before this patch.

device_set_realized()'s recursive unrealization via bus uses
object_property_set_bool().  Can't drop @errp there, so pass
&error_abort.

We similarly unrealize with object_property_set_bool() elsewhere,
always ignoring errors.  Pass &error_abort instead.

Several unrealize methods no longer handle errors from other unrealize
methods: virtio_9p_device_unrealize(),
virtio_input_device_unrealize(), scsi_qdev_unrealize(), ...
Much of the deleted error handling looks wrong anyway.

One unrealize methods no longer ignore such errors:
usb_ehci_pci_exit().

Several realize methods no longer ignore errors when rolling back:
v9fs_device_realize_common(), pci_qdev_unrealize(),
spapr_phb_realize(), usb_qdev_realize(), vfio_ccw_realize(),
virtio_device_realize().

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200505152926.18877-17-armbru@redhat.com>
2020-05-15 07:08:14 +02:00

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/*
* UAS (USB Attached SCSI) emulation
*
* Copyright Red Hat, Inc. 2012
*
* Author: Gerd Hoffmann <kraxel@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/option.h"
#include "qemu/config-file.h"
#include "trace.h"
#include "qemu/error-report.h"
#include "qemu/main-loop.h"
#include "qemu/module.h"
#include "hw/usb.h"
#include "migration/vmstate.h"
#include "desc.h"
#include "hw/qdev-properties.h"
#include "hw/scsi/scsi.h"
#include "scsi/constants.h"
/* --------------------------------------------------------------------- */
#define UAS_UI_COMMAND 0x01
#define UAS_UI_SENSE 0x03
#define UAS_UI_RESPONSE 0x04
#define UAS_UI_TASK_MGMT 0x05
#define UAS_UI_READ_READY 0x06
#define UAS_UI_WRITE_READY 0x07
#define UAS_RC_TMF_COMPLETE 0x00
#define UAS_RC_INVALID_INFO_UNIT 0x02
#define UAS_RC_TMF_NOT_SUPPORTED 0x04
#define UAS_RC_TMF_FAILED 0x05
#define UAS_RC_TMF_SUCCEEDED 0x08
#define UAS_RC_INCORRECT_LUN 0x09
#define UAS_RC_OVERLAPPED_TAG 0x0a
#define UAS_TMF_ABORT_TASK 0x01
#define UAS_TMF_ABORT_TASK_SET 0x02
#define UAS_TMF_CLEAR_TASK_SET 0x04
#define UAS_TMF_LOGICAL_UNIT_RESET 0x08
#define UAS_TMF_I_T_NEXUS_RESET 0x10
#define UAS_TMF_CLEAR_ACA 0x40
#define UAS_TMF_QUERY_TASK 0x80
#define UAS_TMF_QUERY_TASK_SET 0x81
#define UAS_TMF_QUERY_ASYNC_EVENT 0x82
#define UAS_PIPE_ID_COMMAND 0x01
#define UAS_PIPE_ID_STATUS 0x02
#define UAS_PIPE_ID_DATA_IN 0x03
#define UAS_PIPE_ID_DATA_OUT 0x04
typedef struct {
uint8_t id;
uint8_t reserved;
uint16_t tag;
} QEMU_PACKED uas_iu_header;
typedef struct {
uint8_t prio_taskattr; /* 6:3 priority, 2:0 task attribute */
uint8_t reserved_1;
uint8_t add_cdb_length; /* 7:2 additional adb length (dwords) */
uint8_t reserved_2;
uint64_t lun;
uint8_t cdb[16];
uint8_t add_cdb[];
} QEMU_PACKED uas_iu_command;
typedef struct {
uint16_t status_qualifier;
uint8_t status;
uint8_t reserved[7];
uint16_t sense_length;
uint8_t sense_data[18];
} QEMU_PACKED uas_iu_sense;
typedef struct {
uint8_t add_response_info[3];
uint8_t response_code;
} QEMU_PACKED uas_iu_response;
typedef struct {
uint8_t function;
uint8_t reserved;
uint16_t task_tag;
uint64_t lun;
} QEMU_PACKED uas_iu_task_mgmt;
typedef struct {
uas_iu_header hdr;
union {
uas_iu_command command;
uas_iu_sense sense;
uas_iu_task_mgmt task;
uas_iu_response response;
};
} QEMU_PACKED uas_iu;
/* --------------------------------------------------------------------- */
#define UAS_STREAM_BM_ATTR 4
#define UAS_MAX_STREAMS (1 << UAS_STREAM_BM_ATTR)
typedef struct UASDevice UASDevice;
typedef struct UASRequest UASRequest;
typedef struct UASStatus UASStatus;
struct UASDevice {
USBDevice dev;
SCSIBus bus;
QEMUBH *status_bh;
QTAILQ_HEAD(, UASStatus) results;
QTAILQ_HEAD(, UASRequest) requests;
/* properties */
uint32_t requestlog;
/* usb 2.0 only */
USBPacket *status2;
UASRequest *datain2;
UASRequest *dataout2;
/* usb 3.0 only */
USBPacket *data3[UAS_MAX_STREAMS + 1];
USBPacket *status3[UAS_MAX_STREAMS + 1];
};
#define TYPE_USB_UAS "usb-uas"
#define USB_UAS(obj) OBJECT_CHECK(UASDevice, (obj), TYPE_USB_UAS)
struct UASRequest {
uint16_t tag;
uint64_t lun;
UASDevice *uas;
SCSIDevice *dev;
SCSIRequest *req;
USBPacket *data;
bool data_async;
bool active;
bool complete;
uint32_t buf_off;
uint32_t buf_size;
uint32_t data_off;
uint32_t data_size;
QTAILQ_ENTRY(UASRequest) next;
};
struct UASStatus {
uint32_t stream;
uas_iu status;
uint32_t length;
QTAILQ_ENTRY(UASStatus) next;
};
/* --------------------------------------------------------------------- */
enum {
STR_MANUFACTURER = 1,
STR_PRODUCT,
STR_SERIALNUMBER,
STR_CONFIG_HIGH,
STR_CONFIG_SUPER,
};
static const USBDescStrings desc_strings = {
[STR_MANUFACTURER] = "QEMU",
[STR_PRODUCT] = "USB Attached SCSI HBA",
[STR_SERIALNUMBER] = "27842",
[STR_CONFIG_HIGH] = "High speed config (usb 2.0)",
[STR_CONFIG_SUPER] = "Super speed config (usb 3.0)",
};
static const USBDescIface desc_iface_high = {
.bInterfaceNumber = 0,
.bNumEndpoints = 4,
.bInterfaceClass = USB_CLASS_MASS_STORAGE,
.bInterfaceSubClass = 0x06, /* SCSI */
.bInterfaceProtocol = 0x62, /* UAS */
.eps = (USBDescEndpoint[]) {
{
.bEndpointAddress = USB_DIR_OUT | UAS_PIPE_ID_COMMAND,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = 512,
.extra = (uint8_t[]) {
0x04, /* u8 bLength */
0x24, /* u8 bDescriptorType */
UAS_PIPE_ID_COMMAND,
0x00, /* u8 bReserved */
},
},{
.bEndpointAddress = USB_DIR_IN | UAS_PIPE_ID_STATUS,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = 512,
.extra = (uint8_t[]) {
0x04, /* u8 bLength */
0x24, /* u8 bDescriptorType */
UAS_PIPE_ID_STATUS,
0x00, /* u8 bReserved */
},
},{
.bEndpointAddress = USB_DIR_IN | UAS_PIPE_ID_DATA_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = 512,
.extra = (uint8_t[]) {
0x04, /* u8 bLength */
0x24, /* u8 bDescriptorType */
UAS_PIPE_ID_DATA_IN,
0x00, /* u8 bReserved */
},
},{
.bEndpointAddress = USB_DIR_OUT | UAS_PIPE_ID_DATA_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = 512,
.extra = (uint8_t[]) {
0x04, /* u8 bLength */
0x24, /* u8 bDescriptorType */
UAS_PIPE_ID_DATA_OUT,
0x00, /* u8 bReserved */
},
},
}
};
static const USBDescIface desc_iface_super = {
.bInterfaceNumber = 0,
.bNumEndpoints = 4,
.bInterfaceClass = USB_CLASS_MASS_STORAGE,
.bInterfaceSubClass = 0x06, /* SCSI */
.bInterfaceProtocol = 0x62, /* UAS */
.eps = (USBDescEndpoint[]) {
{
.bEndpointAddress = USB_DIR_OUT | UAS_PIPE_ID_COMMAND,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = 1024,
.bMaxBurst = 15,
.extra = (uint8_t[]) {
0x04, /* u8 bLength */
0x24, /* u8 bDescriptorType */
UAS_PIPE_ID_COMMAND,
0x00, /* u8 bReserved */
},
},{
.bEndpointAddress = USB_DIR_IN | UAS_PIPE_ID_STATUS,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = 1024,
.bMaxBurst = 15,
.bmAttributes_super = UAS_STREAM_BM_ATTR,
.extra = (uint8_t[]) {
0x04, /* u8 bLength */
0x24, /* u8 bDescriptorType */
UAS_PIPE_ID_STATUS,
0x00, /* u8 bReserved */
},
},{
.bEndpointAddress = USB_DIR_IN | UAS_PIPE_ID_DATA_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = 1024,
.bMaxBurst = 15,
.bmAttributes_super = UAS_STREAM_BM_ATTR,
.extra = (uint8_t[]) {
0x04, /* u8 bLength */
0x24, /* u8 bDescriptorType */
UAS_PIPE_ID_DATA_IN,
0x00, /* u8 bReserved */
},
},{
.bEndpointAddress = USB_DIR_OUT | UAS_PIPE_ID_DATA_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = 1024,
.bMaxBurst = 15,
.bmAttributes_super = UAS_STREAM_BM_ATTR,
.extra = (uint8_t[]) {
0x04, /* u8 bLength */
0x24, /* u8 bDescriptorType */
UAS_PIPE_ID_DATA_OUT,
0x00, /* u8 bReserved */
},
},
}
};
static const USBDescDevice desc_device_high = {
.bcdUSB = 0x0200,
.bMaxPacketSize0 = 64,
.bNumConfigurations = 1,
.confs = (USBDescConfig[]) {
{
.bNumInterfaces = 1,
.bConfigurationValue = 1,
.iConfiguration = STR_CONFIG_HIGH,
.bmAttributes = USB_CFG_ATT_ONE | USB_CFG_ATT_SELFPOWER,
.nif = 1,
.ifs = &desc_iface_high,
},
},
};
static const USBDescDevice desc_device_super = {
.bcdUSB = 0x0300,
.bMaxPacketSize0 = 9,
.bNumConfigurations = 1,
.confs = (USBDescConfig[]) {
{
.bNumInterfaces = 1,
.bConfigurationValue = 1,
.iConfiguration = STR_CONFIG_SUPER,
.bmAttributes = USB_CFG_ATT_ONE | USB_CFG_ATT_SELFPOWER,
.nif = 1,
.ifs = &desc_iface_super,
},
},
};
static const USBDesc desc = {
.id = {
.idVendor = 0x46f4, /* CRC16() of "QEMU" */
.idProduct = 0x0003,
.bcdDevice = 0,
.iManufacturer = STR_MANUFACTURER,
.iProduct = STR_PRODUCT,
.iSerialNumber = STR_SERIALNUMBER,
},
.high = &desc_device_high,
.super = &desc_device_super,
.str = desc_strings,
};
/* --------------------------------------------------------------------- */
static bool uas_using_streams(UASDevice *uas)
{
return uas->dev.speed == USB_SPEED_SUPER;
}
/* --------------------------------------------------------------------- */
static UASStatus *usb_uas_alloc_status(UASDevice *uas, uint8_t id, uint16_t tag)
{
UASStatus *st = g_new0(UASStatus, 1);
st->status.hdr.id = id;
st->status.hdr.tag = cpu_to_be16(tag);
st->length = sizeof(uas_iu_header);
if (uas_using_streams(uas)) {
st->stream = tag;
}
return st;
}
static void usb_uas_send_status_bh(void *opaque)
{
UASDevice *uas = opaque;
UASStatus *st;
USBPacket *p;
while ((st = QTAILQ_FIRST(&uas->results)) != NULL) {
if (uas_using_streams(uas)) {
p = uas->status3[st->stream];
uas->status3[st->stream] = NULL;
} else {
p = uas->status2;
uas->status2 = NULL;
}
if (p == NULL) {
break;
}
usb_packet_copy(p, &st->status, st->length);
QTAILQ_REMOVE(&uas->results, st, next);
g_free(st);
p->status = USB_RET_SUCCESS; /* Clear previous ASYNC status */
usb_packet_complete(&uas->dev, p);
}
}
static void usb_uas_queue_status(UASDevice *uas, UASStatus *st, int length)
{
USBPacket *p = uas_using_streams(uas) ?
uas->status3[st->stream] : uas->status2;
st->length += length;
QTAILQ_INSERT_TAIL(&uas->results, st, next);
if (p) {
/*
* Just schedule bh make sure any in-flight data transaction
* is finished before completing (sending) the status packet.
*/
qemu_bh_schedule(uas->status_bh);
} else {
USBEndpoint *ep = usb_ep_get(&uas->dev, USB_TOKEN_IN,
UAS_PIPE_ID_STATUS);
usb_wakeup(ep, st->stream);
}
}
static void usb_uas_queue_response(UASDevice *uas, uint16_t tag, uint8_t code)
{
UASStatus *st = usb_uas_alloc_status(uas, UAS_UI_RESPONSE, tag);
trace_usb_uas_response(uas->dev.addr, tag, code);
st->status.response.response_code = code;
usb_uas_queue_status(uas, st, sizeof(uas_iu_response));
}
static void usb_uas_queue_sense(UASRequest *req, uint8_t status)
{
UASStatus *st = usb_uas_alloc_status(req->uas, UAS_UI_SENSE, req->tag);
int len, slen = 0;
trace_usb_uas_sense(req->uas->dev.addr, req->tag, status);
st->status.sense.status = status;
st->status.sense.status_qualifier = cpu_to_be16(0);
if (status != GOOD) {
slen = scsi_req_get_sense(req->req, st->status.sense.sense_data,
sizeof(st->status.sense.sense_data));
st->status.sense.sense_length = cpu_to_be16(slen);
}
len = sizeof(uas_iu_sense) - sizeof(st->status.sense.sense_data) + slen;
usb_uas_queue_status(req->uas, st, len);
}
static void usb_uas_queue_fake_sense(UASDevice *uas, uint16_t tag,
struct SCSISense sense)
{
UASStatus *st = usb_uas_alloc_status(uas, UAS_UI_SENSE, tag);
int len, slen = 0;
st->status.sense.status = CHECK_CONDITION;
st->status.sense.status_qualifier = cpu_to_be16(0);
st->status.sense.sense_data[0] = 0x70;
st->status.sense.sense_data[2] = sense.key;
st->status.sense.sense_data[7] = 10;
st->status.sense.sense_data[12] = sense.asc;
st->status.sense.sense_data[13] = sense.ascq;
slen = 18;
len = sizeof(uas_iu_sense) - sizeof(st->status.sense.sense_data) + slen;
usb_uas_queue_status(uas, st, len);
}
static void usb_uas_queue_read_ready(UASRequest *req)
{
UASStatus *st = usb_uas_alloc_status(req->uas, UAS_UI_READ_READY,
req->tag);
trace_usb_uas_read_ready(req->uas->dev.addr, req->tag);
usb_uas_queue_status(req->uas, st, 0);
}
static void usb_uas_queue_write_ready(UASRequest *req)
{
UASStatus *st = usb_uas_alloc_status(req->uas, UAS_UI_WRITE_READY,
req->tag);
trace_usb_uas_write_ready(req->uas->dev.addr, req->tag);
usb_uas_queue_status(req->uas, st, 0);
}
/* --------------------------------------------------------------------- */
static int usb_uas_get_lun(uint64_t lun64)
{
return (lun64 >> 48) & 0xff;
}
static SCSIDevice *usb_uas_get_dev(UASDevice *uas, uint64_t lun64)
{
if ((lun64 >> 56) != 0x00) {
return NULL;
}
return scsi_device_find(&uas->bus, 0, 0, usb_uas_get_lun(lun64));
}
static void usb_uas_complete_data_packet(UASRequest *req)
{
USBPacket *p;
if (!req->data_async) {
return;
}
p = req->data;
req->data = NULL;
req->data_async = false;
p->status = USB_RET_SUCCESS; /* Clear previous ASYNC status */
usb_packet_complete(&req->uas->dev, p);
}
static void usb_uas_copy_data(UASRequest *req)
{
uint32_t length;
length = MIN(req->buf_size - req->buf_off,
req->data->iov.size - req->data->actual_length);
trace_usb_uas_xfer_data(req->uas->dev.addr, req->tag, length,
req->data->actual_length, req->data->iov.size,
req->buf_off, req->buf_size);
usb_packet_copy(req->data, scsi_req_get_buf(req->req) + req->buf_off,
length);
req->buf_off += length;
req->data_off += length;
if (req->data->actual_length == req->data->iov.size) {
usb_uas_complete_data_packet(req);
}
if (req->buf_size && req->buf_off == req->buf_size) {
req->buf_off = 0;
req->buf_size = 0;
scsi_req_continue(req->req);
}
}
static void usb_uas_start_next_transfer(UASDevice *uas)
{
UASRequest *req;
if (uas_using_streams(uas)) {
return;
}
QTAILQ_FOREACH(req, &uas->requests, next) {
if (req->active || req->complete) {
continue;
}
if (req->req->cmd.mode == SCSI_XFER_FROM_DEV && uas->datain2 == NULL) {
uas->datain2 = req;
usb_uas_queue_read_ready(req);
req->active = true;
return;
}
if (req->req->cmd.mode == SCSI_XFER_TO_DEV && uas->dataout2 == NULL) {
uas->dataout2 = req;
usb_uas_queue_write_ready(req);
req->active = true;
return;
}
}
}
static UASRequest *usb_uas_alloc_request(UASDevice *uas, uas_iu *iu)
{
UASRequest *req;
req = g_new0(UASRequest, 1);
req->uas = uas;
req->tag = be16_to_cpu(iu->hdr.tag);
req->lun = be64_to_cpu(iu->command.lun);
req->dev = usb_uas_get_dev(req->uas, req->lun);
return req;
}
static void usb_uas_scsi_free_request(SCSIBus *bus, void *priv)
{
UASRequest *req = priv;
UASDevice *uas = req->uas;
if (req == uas->datain2) {
uas->datain2 = NULL;
}
if (req == uas->dataout2) {
uas->dataout2 = NULL;
}
QTAILQ_REMOVE(&uas->requests, req, next);
g_free(req);
usb_uas_start_next_transfer(uas);
}
static UASRequest *usb_uas_find_request(UASDevice *uas, uint16_t tag)
{
UASRequest *req;
QTAILQ_FOREACH(req, &uas->requests, next) {
if (req->tag == tag) {
return req;
}
}
return NULL;
}
static void usb_uas_scsi_transfer_data(SCSIRequest *r, uint32_t len)
{
UASRequest *req = r->hba_private;
trace_usb_uas_scsi_data(req->uas->dev.addr, req->tag, len);
req->buf_off = 0;
req->buf_size = len;
if (req->data) {
usb_uas_copy_data(req);
} else {
usb_uas_start_next_transfer(req->uas);
}
}
static void usb_uas_scsi_command_complete(SCSIRequest *r,
uint32_t status, size_t resid)
{
UASRequest *req = r->hba_private;
trace_usb_uas_scsi_complete(req->uas->dev.addr, req->tag, status, resid);
req->complete = true;
if (req->data) {
usb_uas_complete_data_packet(req);
}
usb_uas_queue_sense(req, status);
scsi_req_unref(req->req);
}
static void usb_uas_scsi_request_cancelled(SCSIRequest *r)
{
UASRequest *req = r->hba_private;
/* FIXME: queue notification to status pipe? */
scsi_req_unref(req->req);
}
static const struct SCSIBusInfo usb_uas_scsi_info = {
.tcq = true,
.max_target = 0,
.max_lun = 255,
.transfer_data = usb_uas_scsi_transfer_data,
.complete = usb_uas_scsi_command_complete,
.cancel = usb_uas_scsi_request_cancelled,
.free_request = usb_uas_scsi_free_request,
};
/* --------------------------------------------------------------------- */
static void usb_uas_handle_reset(USBDevice *dev)
{
UASDevice *uas = USB_UAS(dev);
UASRequest *req, *nreq;
UASStatus *st, *nst;
trace_usb_uas_reset(dev->addr);
QTAILQ_FOREACH_SAFE(req, &uas->requests, next, nreq) {
scsi_req_cancel(req->req);
}
QTAILQ_FOREACH_SAFE(st, &uas->results, next, nst) {
QTAILQ_REMOVE(&uas->results, st, next);
g_free(st);
}
}
static void usb_uas_handle_control(USBDevice *dev, USBPacket *p,
int request, int value, int index, int length, uint8_t *data)
{
int ret;
ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
if (ret >= 0) {
return;
}
error_report("%s: unhandled control request (req 0x%x, val 0x%x, idx 0x%x",
__func__, request, value, index);
p->status = USB_RET_STALL;
}
static void usb_uas_cancel_io(USBDevice *dev, USBPacket *p)
{
UASDevice *uas = USB_UAS(dev);
UASRequest *req, *nreq;
int i;
if (uas->status2 == p) {
uas->status2 = NULL;
qemu_bh_cancel(uas->status_bh);
return;
}
if (uas_using_streams(uas)) {
for (i = 0; i <= UAS_MAX_STREAMS; i++) {
if (uas->status3[i] == p) {
uas->status3[i] = NULL;
return;
}
if (uas->data3[i] == p) {
uas->data3[i] = NULL;
return;
}
}
}
QTAILQ_FOREACH_SAFE(req, &uas->requests, next, nreq) {
if (req->data == p) {
req->data = NULL;
return;
}
}
assert(!"canceled usb packet not found");
}
static void usb_uas_command(UASDevice *uas, uas_iu *iu)
{
UASRequest *req;
uint32_t len;
uint16_t tag = be16_to_cpu(iu->hdr.tag);
if (uas_using_streams(uas) && tag > UAS_MAX_STREAMS) {
goto invalid_tag;
}
req = usb_uas_find_request(uas, tag);
if (req) {
goto overlapped_tag;
}
req = usb_uas_alloc_request(uas, iu);
if (req->dev == NULL) {
goto bad_target;
}
trace_usb_uas_command(uas->dev.addr, req->tag,
usb_uas_get_lun(req->lun),
req->lun >> 32, req->lun & 0xffffffff);
QTAILQ_INSERT_TAIL(&uas->requests, req, next);
if (uas_using_streams(uas) && uas->data3[req->tag] != NULL) {
req->data = uas->data3[req->tag];
req->data_async = true;
uas->data3[req->tag] = NULL;
}
req->req = scsi_req_new(req->dev, req->tag,
usb_uas_get_lun(req->lun),
iu->command.cdb, req);
if (uas->requestlog) {
scsi_req_print(req->req);
}
len = scsi_req_enqueue(req->req);
if (len) {
req->data_size = len;
scsi_req_continue(req->req);
}
return;
invalid_tag:
usb_uas_queue_fake_sense(uas, tag, sense_code_INVALID_TAG);
return;
overlapped_tag:
usb_uas_queue_fake_sense(uas, tag, sense_code_OVERLAPPED_COMMANDS);
return;
bad_target:
usb_uas_queue_fake_sense(uas, tag, sense_code_LUN_NOT_SUPPORTED);
g_free(req);
}
static void usb_uas_task(UASDevice *uas, uas_iu *iu)
{
uint16_t tag = be16_to_cpu(iu->hdr.tag);
uint64_t lun64 = be64_to_cpu(iu->task.lun);
SCSIDevice *dev = usb_uas_get_dev(uas, lun64);
int lun = usb_uas_get_lun(lun64);
UASRequest *req;
uint16_t task_tag;
if (uas_using_streams(uas) && tag > UAS_MAX_STREAMS) {
goto invalid_tag;
}
req = usb_uas_find_request(uas, be16_to_cpu(iu->hdr.tag));
if (req) {
goto overlapped_tag;
}
if (dev == NULL) {
goto incorrect_lun;
}
switch (iu->task.function) {
case UAS_TMF_ABORT_TASK:
task_tag = be16_to_cpu(iu->task.task_tag);
trace_usb_uas_tmf_abort_task(uas->dev.addr, tag, task_tag);
req = usb_uas_find_request(uas, task_tag);
if (req && req->dev == dev) {
scsi_req_cancel(req->req);
}
usb_uas_queue_response(uas, tag, UAS_RC_TMF_COMPLETE);
break;
case UAS_TMF_LOGICAL_UNIT_RESET:
trace_usb_uas_tmf_logical_unit_reset(uas->dev.addr, tag, lun);
qdev_reset_all(&dev->qdev);
usb_uas_queue_response(uas, tag, UAS_RC_TMF_COMPLETE);
break;
default:
trace_usb_uas_tmf_unsupported(uas->dev.addr, tag, iu->task.function);
usb_uas_queue_response(uas, tag, UAS_RC_TMF_NOT_SUPPORTED);
break;
}
return;
invalid_tag:
usb_uas_queue_response(uas, tag, UAS_RC_INVALID_INFO_UNIT);
return;
overlapped_tag:
usb_uas_queue_response(uas, req->tag, UAS_RC_OVERLAPPED_TAG);
return;
incorrect_lun:
usb_uas_queue_response(uas, tag, UAS_RC_INCORRECT_LUN);
}
static void usb_uas_handle_data(USBDevice *dev, USBPacket *p)
{
UASDevice *uas = USB_UAS(dev);
uas_iu iu;
UASStatus *st;
UASRequest *req;
int length;
switch (p->ep->nr) {
case UAS_PIPE_ID_COMMAND:
length = MIN(sizeof(iu), p->iov.size);
usb_packet_copy(p, &iu, length);
switch (iu.hdr.id) {
case UAS_UI_COMMAND:
usb_uas_command(uas, &iu);
break;
case UAS_UI_TASK_MGMT:
usb_uas_task(uas, &iu);
break;
default:
error_report("%s: unknown command iu: id 0x%x",
__func__, iu.hdr.id);
p->status = USB_RET_STALL;
break;
}
break;
case UAS_PIPE_ID_STATUS:
if (p->stream) {
QTAILQ_FOREACH(st, &uas->results, next) {
if (st->stream == p->stream) {
break;
}
}
if (st == NULL) {
assert(uas->status3[p->stream] == NULL);
uas->status3[p->stream] = p;
p->status = USB_RET_ASYNC;
break;
}
} else {
st = QTAILQ_FIRST(&uas->results);
if (st == NULL) {
assert(uas->status2 == NULL);
uas->status2 = p;
p->status = USB_RET_ASYNC;
break;
}
}
usb_packet_copy(p, &st->status, st->length);
QTAILQ_REMOVE(&uas->results, st, next);
g_free(st);
break;
case UAS_PIPE_ID_DATA_IN:
case UAS_PIPE_ID_DATA_OUT:
if (p->stream) {
req = usb_uas_find_request(uas, p->stream);
} else {
req = (p->ep->nr == UAS_PIPE_ID_DATA_IN)
? uas->datain2 : uas->dataout2;
}
if (req == NULL) {
if (p->stream) {
assert(uas->data3[p->stream] == NULL);
uas->data3[p->stream] = p;
p->status = USB_RET_ASYNC;
break;
} else {
error_report("%s: no inflight request", __func__);
p->status = USB_RET_STALL;
break;
}
}
scsi_req_ref(req->req);
req->data = p;
usb_uas_copy_data(req);
if (p->actual_length == p->iov.size || req->complete) {
req->data = NULL;
} else {
req->data_async = true;
p->status = USB_RET_ASYNC;
}
scsi_req_unref(req->req);
usb_uas_start_next_transfer(uas);
break;
default:
error_report("%s: invalid endpoint %d", __func__, p->ep->nr);
p->status = USB_RET_STALL;
break;
}
}
static void usb_uas_unrealize(USBDevice *dev)
{
UASDevice *uas = USB_UAS(dev);
qemu_bh_delete(uas->status_bh);
}
static void usb_uas_realize(USBDevice *dev, Error **errp)
{
UASDevice *uas = USB_UAS(dev);
DeviceState *d = DEVICE(dev);
usb_desc_create_serial(dev);
usb_desc_init(dev);
if (d->hotplugged) {
uas->dev.auto_attach = 0;
}
QTAILQ_INIT(&uas->results);
QTAILQ_INIT(&uas->requests);
uas->status_bh = qemu_bh_new(usb_uas_send_status_bh, uas);
scsi_bus_new(&uas->bus, sizeof(uas->bus), DEVICE(dev),
&usb_uas_scsi_info, NULL);
}
static const VMStateDescription vmstate_usb_uas = {
.name = "usb-uas",
.unmigratable = 1,
.fields = (VMStateField[]) {
VMSTATE_USB_DEVICE(dev, UASDevice),
VMSTATE_END_OF_LIST()
}
};
static Property uas_properties[] = {
DEFINE_PROP_UINT32("log-scsi-req", UASDevice, requestlog, 0),
DEFINE_PROP_END_OF_LIST(),
};
static void usb_uas_class_initfn(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
uc->realize = usb_uas_realize;
uc->product_desc = desc_strings[STR_PRODUCT];
uc->usb_desc = &desc;
uc->cancel_packet = usb_uas_cancel_io;
uc->handle_attach = usb_desc_attach;
uc->handle_reset = usb_uas_handle_reset;
uc->handle_control = usb_uas_handle_control;
uc->handle_data = usb_uas_handle_data;
uc->unrealize = usb_uas_unrealize;
uc->attached_settable = true;
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
dc->fw_name = "storage";
dc->vmsd = &vmstate_usb_uas;
device_class_set_props(dc, uas_properties);
}
static const TypeInfo uas_info = {
.name = TYPE_USB_UAS,
.parent = TYPE_USB_DEVICE,
.instance_size = sizeof(UASDevice),
.class_init = usb_uas_class_initfn,
};
static void usb_uas_register_types(void)
{
type_register_static(&uas_info);
}
type_init(usb_uas_register_types)
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