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qemu/hw/scsi/scsi-bus.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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#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "qemu/module.h"
#include "qemu/option.h"
#include "hw/qdev-properties.h"
#include "hw/scsi/scsi.h"
#include "migration/qemu-file-types.h"
#include "migration/vmstate.h"
#include "scsi/constants.h"
#include "sysemu/block-backend.h"
#include "sysemu/blockdev.h"
#include "sysemu/sysemu.h"
#include "sysemu/runstate.h"
#include "trace.h"
#include "sysemu/dma.h"
#include "qemu/cutils.h"
static char *scsibus_get_dev_path(DeviceState *dev);
static char *scsibus_get_fw_dev_path(DeviceState *dev);
static void scsi_req_dequeue(SCSIRequest *req);
static uint8_t *scsi_target_alloc_buf(SCSIRequest *req, size_t len);
static void scsi_target_free_buf(SCSIRequest *req);
static Property scsi_props[] = {
DEFINE_PROP_UINT32("channel", SCSIDevice, channel, 0),
DEFINE_PROP_UINT32("scsi-id", SCSIDevice, id, -1),
DEFINE_PROP_UINT32("lun", SCSIDevice, lun, -1),
DEFINE_PROP_END_OF_LIST(),
};
static void scsi_bus_class_init(ObjectClass *klass, void *data)
{
BusClass *k = BUS_CLASS(klass);
HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
k->get_dev_path = scsibus_get_dev_path;
k->get_fw_dev_path = scsibus_get_fw_dev_path;
hc->unplug = qdev_simple_device_unplug_cb;
}
static const TypeInfo scsi_bus_info = {
.name = TYPE_SCSI_BUS,
.parent = TYPE_BUS,
.instance_size = sizeof(SCSIBus),
.class_init = scsi_bus_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_HOTPLUG_HANDLER },
{ }
}
};
static int next_scsi_bus;
static void scsi_device_realize(SCSIDevice *s, Error **errp)
{
SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s);
if (sc->realize) {
sc->realize(s, errp);
}
}
static void scsi_device_unrealize(SCSIDevice *s)
{
SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s);
if (sc->unrealize) {
sc->unrealize(s);
}
}
int scsi_bus_parse_cdb(SCSIDevice *dev, SCSICommand *cmd, uint8_t *buf,
void *hba_private)
{
SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
int rc;
assert(cmd->len == 0);
rc = scsi_req_parse_cdb(dev, cmd, buf);
if (bus->info->parse_cdb) {
rc = bus->info->parse_cdb(dev, cmd, buf, hba_private);
}
return rc;
}
static SCSIRequest *scsi_device_alloc_req(SCSIDevice *s, uint32_t tag, uint32_t lun,
uint8_t *buf, void *hba_private)
{
SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s);
if (sc->alloc_req) {
return sc->alloc_req(s, tag, lun, buf, hba_private);
}
return NULL;
}
void scsi_device_unit_attention_reported(SCSIDevice *s)
{
SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s);
if (sc->unit_attention_reported) {
sc->unit_attention_reported(s);
}
}
/* Create a scsi bus, and attach devices to it. */
void scsi_bus_new(SCSIBus *bus, size_t bus_size, DeviceState *host,
const SCSIBusInfo *info, const char *bus_name)
{
qbus_create_inplace(bus, bus_size, TYPE_SCSI_BUS, host, bus_name);
bus->busnr = next_scsi_bus++;
bus->info = info;
qbus_set_bus_hotplug_handler(BUS(bus), &error_abort);
}
static void scsi_dma_restart_bh(void *opaque)
{
SCSIDevice *s = opaque;
SCSIRequest *req, *next;
qemu_bh_delete(s->bh);
s->bh = NULL;
aio_context_acquire(blk_get_aio_context(s->conf.blk));
QTAILQ_FOREACH_SAFE(req, &s->requests, next, next) {
scsi_req_ref(req);
if (req->retry) {
req->retry = false;
switch (req->cmd.mode) {
case SCSI_XFER_FROM_DEV:
case SCSI_XFER_TO_DEV:
scsi_req_continue(req);
break;
case SCSI_XFER_NONE:
scsi_req_dequeue(req);
scsi_req_enqueue(req);
break;
}
}
scsi_req_unref(req);
}
aio_context_release(blk_get_aio_context(s->conf.blk));
}
void scsi_req_retry(SCSIRequest *req)
{
/* No need to save a reference, because scsi_dma_restart_bh just
* looks at the request list. */
req->retry = true;
}
static void scsi_dma_restart_cb(void *opaque, int running, RunState state)
{
SCSIDevice *s = opaque;
if (!running) {
return;
}
if (!s->bh) {
AioContext *ctx = blk_get_aio_context(s->conf.blk);
s->bh = aio_bh_new(ctx, scsi_dma_restart_bh, s);
qemu_bh_schedule(s->bh);
}
}
static void scsi_qdev_realize(DeviceState *qdev, Error **errp)
{
SCSIDevice *dev = SCSI_DEVICE(qdev);
SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
SCSIDevice *d;
Error *local_err = NULL;
if (dev->channel > bus->info->max_channel) {
error_setg(errp, "bad scsi channel id: %d", dev->channel);
return;
}
if (dev->id != -1 && dev->id > bus->info->max_target) {
error_setg(errp, "bad scsi device id: %d", dev->id);
return;
}
if (dev->lun != -1 && dev->lun > bus->info->max_lun) {
error_setg(errp, "bad scsi device lun: %d", dev->lun);
return;
}
if (dev->id == -1) {
int id = -1;
if (dev->lun == -1) {
dev->lun = 0;
}
do {
d = scsi_device_find(bus, dev->channel, ++id, dev->lun);
} while (d && d->lun == dev->lun && id < bus->info->max_target);
if (d && d->lun == dev->lun) {
error_setg(errp, "no free target");
return;
}
dev->id = id;
} else if (dev->lun == -1) {
int lun = -1;
do {
d = scsi_device_find(bus, dev->channel, dev->id, ++lun);
} while (d && d->lun == lun && lun < bus->info->max_lun);
if (d && d->lun == lun) {
error_setg(errp, "no free lun");
return;
}
dev->lun = lun;
} else {
d = scsi_device_find(bus, dev->channel, dev->id, dev->lun);
assert(d);
if (d->lun == dev->lun && dev != d) {
error_setg(errp, "lun already used by '%s'", d->qdev.id);
return;
}
}
QTAILQ_INIT(&dev->requests);
scsi_device_realize(dev, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
dev->vmsentry = qdev_add_vm_change_state_handler(DEVICE(dev),
scsi_dma_restart_cb, dev);
}
static void scsi_qdev_unrealize(DeviceState *qdev)
{
SCSIDevice *dev = SCSI_DEVICE(qdev);
if (dev->vmsentry) {
qemu_del_vm_change_state_handler(dev->vmsentry);
}
scsi_device_purge_requests(dev, SENSE_CODE(NO_SENSE));
scsi_device_unrealize(dev);
blockdev_mark_auto_del(dev->conf.blk);
}
/* handle legacy '-drive if=scsi,...' cmd line args */
SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, BlockBackend *blk,
int unit, bool removable, int bootindex,
bool share_rw,
BlockdevOnError rerror,
BlockdevOnError werror,
const char *serial, Error **errp)
{
const char *driver;
char *name;
DeviceState *dev;
Error *err = NULL;
DriveInfo *dinfo;
if (blk_is_sg(blk)) {
driver = "scsi-generic";
} else {
dinfo = blk_legacy_dinfo(blk);
if (dinfo && dinfo->media_cd) {
driver = "scsi-cd";
} else {
driver = "scsi-hd";
}
}
dev = qdev_create(&bus->qbus, driver);
name = g_strdup_printf("legacy[%d]", unit);
object_property_add_child(OBJECT(bus), name, OBJECT(dev));
g_free(name);
qdev_prop_set_uint32(dev, "scsi-id", unit);
if (bootindex >= 0) {
object_property_set_int(OBJECT(dev), bootindex, "bootindex",
&error_abort);
}
if (object_property_find(OBJECT(dev), "removable", NULL)) {
qdev_prop_set_bit(dev, "removable", removable);
}
if (serial && object_property_find(OBJECT(dev), "serial", NULL)) {
qdev_prop_set_string(dev, "serial", serial);
}
qdev_prop_set_drive(dev, "drive", blk, &err);
if (err) {
error_propagate(errp, err);
object_unparent(OBJECT(dev));
return NULL;
}
object_property_set_bool(OBJECT(dev), share_rw, "share-rw", &err);
if (err != NULL) {
error_propagate(errp, err);
object_unparent(OBJECT(dev));
return NULL;
}
qdev_prop_set_enum(dev, "rerror", rerror);
qdev_prop_set_enum(dev, "werror", werror);
object_property_set_bool(OBJECT(dev), true, "realized", &err);
if (err != NULL) {
error_propagate(errp, err);
object_unparent(OBJECT(dev));
return NULL;
}
return SCSI_DEVICE(dev);
}
void scsi_bus_legacy_handle_cmdline(SCSIBus *bus)
{
Location loc;
DriveInfo *dinfo;
int unit;
loc_push_none(&loc);
for (unit = 0; unit <= bus->info->max_target; unit++) {
dinfo = drive_get(IF_SCSI, bus->busnr, unit);
if (dinfo == NULL) {
continue;
}
qemu_opts_loc_restore(dinfo->opts);
scsi_bus_legacy_add_drive(bus, blk_by_legacy_dinfo(dinfo),
unit, false, -1, false,
BLOCKDEV_ON_ERROR_AUTO,
BLOCKDEV_ON_ERROR_AUTO,
NULL, &error_fatal);
}
loc_pop(&loc);
}
static int32_t scsi_invalid_field(SCSIRequest *req, uint8_t *buf)
{
scsi_req_build_sense(req, SENSE_CODE(INVALID_FIELD));
scsi_req_complete(req, CHECK_CONDITION);
return 0;
}
static const struct SCSIReqOps reqops_invalid_field = {
.size = sizeof(SCSIRequest),
.send_command = scsi_invalid_field
};
/* SCSIReqOps implementation for invalid commands. */
static int32_t scsi_invalid_command(SCSIRequest *req, uint8_t *buf)
{
scsi_req_build_sense(req, SENSE_CODE(INVALID_OPCODE));
scsi_req_complete(req, CHECK_CONDITION);
return 0;
}
static const struct SCSIReqOps reqops_invalid_opcode = {
.size = sizeof(SCSIRequest),
.send_command = scsi_invalid_command
};
/* SCSIReqOps implementation for unit attention conditions. */
static int32_t scsi_unit_attention(SCSIRequest *req, uint8_t *buf)
{
if (req->dev->unit_attention.key == UNIT_ATTENTION) {
scsi_req_build_sense(req, req->dev->unit_attention);
} else if (req->bus->unit_attention.key == UNIT_ATTENTION) {
scsi_req_build_sense(req, req->bus->unit_attention);
}
scsi_req_complete(req, CHECK_CONDITION);
return 0;
}
static const struct SCSIReqOps reqops_unit_attention = {
.size = sizeof(SCSIRequest),
.send_command = scsi_unit_attention
};
/* SCSIReqOps implementation for REPORT LUNS and for commands sent to
an invalid LUN. */
typedef struct SCSITargetReq SCSITargetReq;
struct SCSITargetReq {
SCSIRequest req;
int len;
uint8_t *buf;
int buf_len;
};
static void store_lun(uint8_t *outbuf, int lun)
{
if (lun < 256) {
outbuf[1] = lun;
return;
}
outbuf[1] = (lun & 255);
outbuf[0] = (lun >> 8) | 0x40;
}
static bool scsi_target_emulate_report_luns(SCSITargetReq *r)
{
BusChild *kid;
int i, len, n;
int channel, id;
bool found_lun0;
if (r->req.cmd.xfer < 16) {
return false;
}
if (r->req.cmd.buf[2] > 2) {
return false;
}
channel = r->req.dev->channel;
id = r->req.dev->id;
found_lun0 = false;
n = 0;
QTAILQ_FOREACH(kid, &r->req.bus->qbus.children, sibling) {
DeviceState *qdev = kid->child;
SCSIDevice *dev = SCSI_DEVICE(qdev);
if (dev->channel == channel && dev->id == id) {
if (dev->lun == 0) {
found_lun0 = true;
}
n += 8;
}
}
if (!found_lun0) {
n += 8;
}
scsi_target_alloc_buf(&r->req, n + 8);
len = MIN(n + 8, r->req.cmd.xfer & ~7);
memset(r->buf, 0, len);
stl_be_p(&r->buf[0], n);
i = found_lun0 ? 8 : 16;
QTAILQ_FOREACH(kid, &r->req.bus->qbus.children, sibling) {
DeviceState *qdev = kid->child;
SCSIDevice *dev = SCSI_DEVICE(qdev);
if (dev->channel == channel && dev->id == id) {
store_lun(&r->buf[i], dev->lun);
i += 8;
}
}
assert(i == n + 8);
r->len = len;
return true;
}
static bool scsi_target_emulate_inquiry(SCSITargetReq *r)
{
assert(r->req.dev->lun != r->req.lun);
scsi_target_alloc_buf(&r->req, SCSI_INQUIRY_LEN);
if (r->req.cmd.buf[1] & 0x2) {
/* Command support data - optional, not implemented */
return false;
}
if (r->req.cmd.buf[1] & 0x1) {
/* Vital product data */
uint8_t page_code = r->req.cmd.buf[2];
r->buf[r->len++] = page_code ; /* this page */
r->buf[r->len++] = 0x00;
switch (page_code) {
case 0x00: /* Supported page codes, mandatory */
{
int pages;
pages = r->len++;
r->buf[r->len++] = 0x00; /* list of supported pages (this page) */
r->buf[pages] = r->len - pages - 1; /* number of pages */
break;
}
default:
return false;
}
/* done with EVPD */
assert(r->len < r->buf_len);
r->len = MIN(r->req.cmd.xfer, r->len);
return true;
}
/* Standard INQUIRY data */
if (r->req.cmd.buf[2] != 0) {
return false;
}
/* PAGE CODE == 0 */
r->len = MIN(r->req.cmd.xfer, SCSI_INQUIRY_LEN);
memset(r->buf, 0, r->len);
if (r->req.lun != 0) {
r->buf[0] = TYPE_NO_LUN;
} else {
r->buf[0] = TYPE_NOT_PRESENT | TYPE_INACTIVE;
r->buf[2] = 5; /* Version */
r->buf[3] = 2 | 0x10; /* HiSup, response data format */
r->buf[4] = r->len - 5; /* Additional Length = (Len - 1) - 4 */
r->buf[7] = 0x10 | (r->req.bus->info->tcq ? 0x02 : 0); /* Sync, TCQ. */
memcpy(&r->buf[8], "QEMU ", 8);
memcpy(&r->buf[16], "QEMU TARGET ", 16);
pstrcpy((char *) &r->buf[32], 4, qemu_hw_version());
}
return true;
}
static size_t scsi_sense_len(SCSIRequest *req)
{
if (req->dev->type == TYPE_SCANNER)
return SCSI_SENSE_LEN_SCANNER;
else
return SCSI_SENSE_LEN;
}
static int32_t scsi_target_send_command(SCSIRequest *req, uint8_t *buf)
{
SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req);
int fixed_sense = (req->cmd.buf[1] & 1) == 0;
if (req->lun != 0 &&
buf[0] != INQUIRY && buf[0] != REQUEST_SENSE) {
scsi_req_build_sense(req, SENSE_CODE(LUN_NOT_SUPPORTED));
scsi_req_complete(req, CHECK_CONDITION);
return 0;
}
switch (buf[0]) {
case REPORT_LUNS:
if (!scsi_target_emulate_report_luns(r)) {
goto illegal_request;
}
break;
case INQUIRY:
if (!scsi_target_emulate_inquiry(r)) {
goto illegal_request;
}
break;
case REQUEST_SENSE:
scsi_target_alloc_buf(&r->req, scsi_sense_len(req));
if (req->lun != 0) {
const struct SCSISense sense = SENSE_CODE(LUN_NOT_SUPPORTED);
r->len = scsi_build_sense_buf(r->buf, req->cmd.xfer,
sense, fixed_sense);
} else {
r->len = scsi_device_get_sense(r->req.dev, r->buf,
MIN(req->cmd.xfer, r->buf_len),
fixed_sense);
}
if (r->req.dev->sense_is_ua) {
scsi_device_unit_attention_reported(req->dev);
r->req.dev->sense_len = 0;
r->req.dev->sense_is_ua = false;
}
break;
case TEST_UNIT_READY:
break;
default:
scsi_req_build_sense(req, SENSE_CODE(INVALID_OPCODE));
scsi_req_complete(req, CHECK_CONDITION);
return 0;
illegal_request:
scsi_req_build_sense(req, SENSE_CODE(INVALID_FIELD));
scsi_req_complete(req, CHECK_CONDITION);
return 0;
}
if (!r->len) {
scsi_req_complete(req, GOOD);
}
return r->len;
}
static void scsi_target_read_data(SCSIRequest *req)
{
SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req);
uint32_t n;
n = r->len;
if (n > 0) {
r->len = 0;
scsi_req_data(&r->req, n);
} else {
scsi_req_complete(&r->req, GOOD);
}
}
static uint8_t *scsi_target_get_buf(SCSIRequest *req)
{
SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req);
return r->buf;
}
static uint8_t *scsi_target_alloc_buf(SCSIRequest *req, size_t len)
{
SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req);
r->buf = g_malloc(len);
r->buf_len = len;
return r->buf;
}
static void scsi_target_free_buf(SCSIRequest *req)
{
SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req);
g_free(r->buf);
}
static const struct SCSIReqOps reqops_target_command = {
.size = sizeof(SCSITargetReq),
.send_command = scsi_target_send_command,
.read_data = scsi_target_read_data,
.get_buf = scsi_target_get_buf,
.free_req = scsi_target_free_buf,
};
SCSIRequest *scsi_req_alloc(const SCSIReqOps *reqops, SCSIDevice *d,
uint32_t tag, uint32_t lun, void *hba_private)
{
SCSIRequest *req;
SCSIBus *bus = scsi_bus_from_device(d);
BusState *qbus = BUS(bus);
const int memset_off = offsetof(SCSIRequest, sense)
+ sizeof(req->sense);
req = g_malloc(reqops->size);
memset((uint8_t *)req + memset_off, 0, reqops->size - memset_off);
req->refcount = 1;
req->bus = bus;
req->dev = d;
req->tag = tag;
req->lun = lun;
req->hba_private = hba_private;
req->status = -1;
req->ops = reqops;
object_ref(OBJECT(d));
object_ref(OBJECT(qbus->parent));
notifier_list_init(&req->cancel_notifiers);
trace_scsi_req_alloc(req->dev->id, req->lun, req->tag);
return req;
}
SCSIRequest *scsi_req_new(SCSIDevice *d, uint32_t tag, uint32_t lun,
uint8_t *buf, void *hba_private)
{
SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, d->qdev.parent_bus);
const SCSIReqOps *ops;
SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(d);
SCSIRequest *req;
SCSICommand cmd = { .len = 0 };
int ret;
if ((d->unit_attention.key == UNIT_ATTENTION ||
bus->unit_attention.key == UNIT_ATTENTION) &&
(buf[0] != INQUIRY &&
buf[0] != REPORT_LUNS &&
buf[0] != GET_CONFIGURATION &&
buf[0] != GET_EVENT_STATUS_NOTIFICATION &&
/*
* If we already have a pending unit attention condition,
* report this one before triggering another one.
*/
!(buf[0] == REQUEST_SENSE && d->sense_is_ua))) {
ops = &reqops_unit_attention;
} else if (lun != d->lun ||
buf[0] == REPORT_LUNS ||
(buf[0] == REQUEST_SENSE && d->sense_len)) {
ops = &reqops_target_command;
} else {
ops = NULL;
}
if (ops != NULL || !sc->parse_cdb) {
ret = scsi_req_parse_cdb(d, &cmd, buf);
} else {
ret = sc->parse_cdb(d, &cmd, buf, hba_private);
}
if (ret != 0) {
trace_scsi_req_parse_bad(d->id, lun, tag, buf[0]);
req = scsi_req_alloc(&reqops_invalid_opcode, d, tag, lun, hba_private);
} else {
assert(cmd.len != 0);
trace_scsi_req_parsed(d->id, lun, tag, buf[0],
cmd.mode, cmd.xfer);
if (cmd.lba != -1) {
trace_scsi_req_parsed_lba(d->id, lun, tag, buf[0],
cmd.lba);
}
if (cmd.xfer > INT32_MAX) {
req = scsi_req_alloc(&reqops_invalid_field, d, tag, lun, hba_private);
} else if (ops) {
req = scsi_req_alloc(ops, d, tag, lun, hba_private);
} else {
req = scsi_device_alloc_req(d, tag, lun, buf, hba_private);
}
}
req->cmd = cmd;
req->resid = req->cmd.xfer;
switch (buf[0]) {
case INQUIRY:
trace_scsi_inquiry(d->id, lun, tag, cmd.buf[1], cmd.buf[2]);
break;
case TEST_UNIT_READY:
trace_scsi_test_unit_ready(d->id, lun, tag);
break;
case REPORT_LUNS:
trace_scsi_report_luns(d->id, lun, tag);
break;
case REQUEST_SENSE:
trace_scsi_request_sense(d->id, lun, tag);
break;
default:
break;
}
return req;
}
uint8_t *scsi_req_get_buf(SCSIRequest *req)
{
return req->ops->get_buf(req);
}
static void scsi_clear_unit_attention(SCSIRequest *req)
{
SCSISense *ua;
if (req->dev->unit_attention.key != UNIT_ATTENTION &&
req->bus->unit_attention.key != UNIT_ATTENTION) {
return;
}
/*
* If an INQUIRY command enters the enabled command state,
* the device server shall [not] clear any unit attention condition;
* See also MMC-6, paragraphs 6.5 and 6.6.2.
*/
if (req->cmd.buf[0] == INQUIRY ||
req->cmd.buf[0] == GET_CONFIGURATION ||
req->cmd.buf[0] == GET_EVENT_STATUS_NOTIFICATION) {
return;
}
if (req->dev->unit_attention.key == UNIT_ATTENTION) {
ua = &req->dev->unit_attention;
} else {
ua = &req->bus->unit_attention;
}
/*
* If a REPORT LUNS command enters the enabled command state, [...]
* the device server shall clear any pending unit attention condition
* with an additional sense code of REPORTED LUNS DATA HAS CHANGED.
*/
if (req->cmd.buf[0] == REPORT_LUNS &&
!(ua->asc == SENSE_CODE(REPORTED_LUNS_CHANGED).asc &&
ua->ascq == SENSE_CODE(REPORTED_LUNS_CHANGED).ascq)) {
return;
}
*ua = SENSE_CODE(NO_SENSE);
}
int scsi_req_get_sense(SCSIRequest *req, uint8_t *buf, int len)
{
int ret;
assert(len >= 14);
if (!req->sense_len) {
return 0;
}
ret = scsi_convert_sense(req->sense, req->sense_len, buf, len, true);
/*
* FIXME: clearing unit attention conditions upon autosense should be done
* only if the UA_INTLCK_CTRL field in the Control mode page is set to 00b
* (SAM-5, 5.14).
*
* We assume UA_INTLCK_CTRL to be 00b for HBAs that support autosense, and
* 10b for HBAs that do not support it (do not call scsi_req_get_sense).
* Here we handle unit attention clearing for UA_INTLCK_CTRL == 00b.
*/
if (req->dev->sense_is_ua) {
scsi_device_unit_attention_reported(req->dev);
req->dev->sense_len = 0;
req->dev->sense_is_ua = false;
}
return ret;
}
int scsi_device_get_sense(SCSIDevice *dev, uint8_t *buf, int len, bool fixed)
{
return scsi_convert_sense(dev->sense, dev->sense_len, buf, len, fixed);
}
void scsi_req_build_sense(SCSIRequest *req, SCSISense sense)
{
trace_scsi_req_build_sense(req->dev->id, req->lun, req->tag,
sense.key, sense.asc, sense.ascq);
req->sense_len = scsi_build_sense(req->sense, sense);
}
static void scsi_req_enqueue_internal(SCSIRequest *req)
{
assert(!req->enqueued);
scsi_req_ref(req);
if (req->bus->info->get_sg_list) {
req->sg = req->bus->info->get_sg_list(req);
} else {
req->sg = NULL;
}
req->enqueued = true;
QTAILQ_INSERT_TAIL(&req->dev->requests, req, next);
}
int32_t scsi_req_enqueue(SCSIRequest *req)
{
int32_t rc;
assert(!req->retry);
scsi_req_enqueue_internal(req);
scsi_req_ref(req);
rc = req->ops->send_command(req, req->cmd.buf);
scsi_req_unref(req);
return rc;
}
static void scsi_req_dequeue(SCSIRequest *req)
{
trace_scsi_req_dequeue(req->dev->id, req->lun, req->tag);
req->retry = false;
if (req->enqueued) {
QTAILQ_REMOVE(&req->dev->requests, req, next);
req->enqueued = false;
scsi_req_unref(req);
}
}
static int scsi_get_performance_length(int num_desc, int type, int data_type)
{
/* MMC-6, paragraph 6.7. */
switch (type) {
case 0:
if ((data_type & 3) == 0) {
/* Each descriptor is as in Table 295 - Nominal performance. */
return 16 * num_desc + 8;
} else {
/* Each descriptor is as in Table 296 - Exceptions. */
return 6 * num_desc + 8;
}
case 1:
case 4:
case 5:
return 8 * num_desc + 8;
case 2:
return 2048 * num_desc + 8;
case 3:
return 16 * num_desc + 8;
default:
return 8;
}
}
static int ata_passthrough_xfer_unit(SCSIDevice *dev, uint8_t *buf)
{
int byte_block = (buf[2] >> 2) & 0x1;
int type = (buf[2] >> 4) & 0x1;
int xfer_unit;
if (byte_block) {
if (type) {
xfer_unit = dev->blocksize;
} else {
xfer_unit = 512;
}
} else {
xfer_unit = 1;
}
return xfer_unit;
}
static int ata_passthrough_12_xfer(SCSIDevice *dev, uint8_t *buf)
{
int length = buf[2] & 0x3;
int xfer;
int unit = ata_passthrough_xfer_unit(dev, buf);
switch (length) {
case 0:
case 3: /* USB-specific. */
default:
xfer = 0;
break;
case 1:
xfer = buf[3];
break;
case 2:
xfer = buf[4];
break;
}
return xfer * unit;
}
static int ata_passthrough_16_xfer(SCSIDevice *dev, uint8_t *buf)
{
int extend = buf[1] & 0x1;
int length = buf[2] & 0x3;
int xfer;
int unit = ata_passthrough_xfer_unit(dev, buf);
switch (length) {
case 0:
case 3: /* USB-specific. */
default:
xfer = 0;
break;
case 1:
xfer = buf[4];
xfer |= (extend ? buf[3] << 8 : 0);
break;
case 2:
xfer = buf[6];
xfer |= (extend ? buf[5] << 8 : 0);
break;
}
return xfer * unit;
}
static int scsi_req_xfer(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
{
cmd->xfer = scsi_cdb_xfer(buf);
switch (buf[0]) {
case TEST_UNIT_READY:
case REWIND:
case START_STOP:
case SET_CAPACITY:
case WRITE_FILEMARKS:
case WRITE_FILEMARKS_16:
case SPACE:
case RESERVE:
case RELEASE:
case ERASE:
case ALLOW_MEDIUM_REMOVAL:
case SEEK_10:
case SYNCHRONIZE_CACHE:
case SYNCHRONIZE_CACHE_16:
case LOCATE_16:
case LOCK_UNLOCK_CACHE:
case SET_CD_SPEED:
case SET_LIMITS:
case WRITE_LONG_10:
case UPDATE_BLOCK:
case RESERVE_TRACK:
case SET_READ_AHEAD:
case PRE_FETCH:
case PRE_FETCH_16:
case ALLOW_OVERWRITE:
cmd->xfer = 0;
break;
case VERIFY_10:
case VERIFY_12:
case VERIFY_16:
if ((buf[1] & 2) == 0) {
cmd->xfer = 0;
} else if ((buf[1] & 4) != 0) {
cmd->xfer = 1;
}
cmd->xfer *= dev->blocksize;
break;
case MODE_SENSE:
break;
case WRITE_SAME_10:
case WRITE_SAME_16:
cmd->xfer = buf[1] & 1 ? 0 : dev->blocksize;
break;
case READ_CAPACITY_10:
cmd->xfer = 8;
break;
case READ_BLOCK_LIMITS:
cmd->xfer = 6;
break;
case SEND_VOLUME_TAG:
/* GPCMD_SET_STREAMING from multimedia commands. */
if (dev->type == TYPE_ROM) {
cmd->xfer = buf[10] | (buf[9] << 8);
} else {
cmd->xfer = buf[9] | (buf[8] << 8);
}
break;
case WRITE_6:
/* length 0 means 256 blocks */
if (cmd->xfer == 0) {
cmd->xfer = 256;
}
/* fall through */
case WRITE_10:
case WRITE_VERIFY_10:
case WRITE_12:
case WRITE_VERIFY_12:
case WRITE_16:
case WRITE_VERIFY_16:
cmd->xfer *= dev->blocksize;
break;
case READ_6:
case READ_REVERSE:
/* length 0 means 256 blocks */
if (cmd->xfer == 0) {
cmd->xfer = 256;
}
/* fall through */
case READ_10:
case READ_12:
case READ_16:
cmd->xfer *= dev->blocksize;
break;
case FORMAT_UNIT:
/* MMC mandates the parameter list to be 12-bytes long. Parameters
* for block devices are restricted to the header right now. */
if (dev->type == TYPE_ROM && (buf[1] & 16)) {
cmd->xfer = 12;
} else {
cmd->xfer = (buf[1] & 16) == 0 ? 0 : (buf[1] & 32 ? 8 : 4);
}
break;
case INQUIRY:
case RECEIVE_DIAGNOSTIC:
case SEND_DIAGNOSTIC:
cmd->xfer = buf[4] | (buf[3] << 8);
break;
case READ_CD:
case READ_BUFFER:
case WRITE_BUFFER:
case SEND_CUE_SHEET:
cmd->xfer = buf[8] | (buf[7] << 8) | (buf[6] << 16);
break;
case PERSISTENT_RESERVE_OUT:
cmd->xfer = ldl_be_p(&buf[5]) & 0xffffffffULL;
break;
case ERASE_12:
if (dev->type == TYPE_ROM) {
/* MMC command GET PERFORMANCE. */
cmd->xfer = scsi_get_performance_length(buf[9] | (buf[8] << 8),
buf[10], buf[1] & 0x1f);
}
break;
case MECHANISM_STATUS:
case READ_DVD_STRUCTURE:
case SEND_DVD_STRUCTURE:
case MAINTENANCE_OUT:
case MAINTENANCE_IN:
if (dev->type == TYPE_ROM) {
/* GPCMD_REPORT_KEY and GPCMD_SEND_KEY from multi media commands */
cmd->xfer = buf[9] | (buf[8] << 8);
}
break;
case ATA_PASSTHROUGH_12:
if (dev->type == TYPE_ROM) {
/* BLANK command of MMC */
cmd->xfer = 0;
} else {
cmd->xfer = ata_passthrough_12_xfer(dev, buf);
}
break;
case ATA_PASSTHROUGH_16:
cmd->xfer = ata_passthrough_16_xfer(dev, buf);
break;
}
return 0;
}
static int scsi_req_stream_xfer(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
{
switch (buf[0]) {
/* stream commands */
case ERASE_12:
case ERASE_16:
cmd->xfer = 0;
break;
case READ_6:
case READ_REVERSE:
case RECOVER_BUFFERED_DATA:
case WRITE_6:
cmd->xfer = buf[4] | (buf[3] << 8) | (buf[2] << 16);
if (buf[1] & 0x01) { /* fixed */
cmd->xfer *= dev->blocksize;
}
break;
case READ_16:
case READ_REVERSE_16:
case VERIFY_16:
case WRITE_16:
cmd->xfer = buf[14] | (buf[13] << 8) | (buf[12] << 16);
if (buf[1] & 0x01) { /* fixed */
cmd->xfer *= dev->blocksize;
}
break;
case REWIND:
case LOAD_UNLOAD:
cmd->xfer = 0;
break;
case SPACE_16:
cmd->xfer = buf[13] | (buf[12] << 8);
break;
case READ_POSITION:
switch (buf[1] & 0x1f) /* operation code */ {
case SHORT_FORM_BLOCK_ID:
case SHORT_FORM_VENDOR_SPECIFIC:
cmd->xfer = 20;
break;
case LONG_FORM:
cmd->xfer = 32;
break;
case EXTENDED_FORM:
cmd->xfer = buf[8] | (buf[7] << 8);
break;
default:
return -1;
}
break;
case FORMAT_UNIT:
cmd->xfer = buf[4] | (buf[3] << 8);
break;
/* generic commands */
default:
return scsi_req_xfer(cmd, dev, buf);
}
return 0;
}
static int scsi_req_medium_changer_xfer(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
{
switch (buf[0]) {
/* medium changer commands */
case EXCHANGE_MEDIUM:
case INITIALIZE_ELEMENT_STATUS:
case INITIALIZE_ELEMENT_STATUS_WITH_RANGE:
case MOVE_MEDIUM:
case POSITION_TO_ELEMENT:
cmd->xfer = 0;
break;
case READ_ELEMENT_STATUS:
cmd->xfer = buf[9] | (buf[8] << 8) | (buf[7] << 16);
break;
/* generic commands */
default:
return scsi_req_xfer(cmd, dev, buf);
}
return 0;
}
static int scsi_req_scanner_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
{
switch (buf[0]) {
/* Scanner commands */
case OBJECT_POSITION:
cmd->xfer = 0;
break;
case SCAN:
cmd->xfer = buf[4];
break;
case READ_10:
case SEND:
case GET_WINDOW:
case SET_WINDOW:
cmd->xfer = buf[8] | (buf[7] << 8) | (buf[6] << 16);
break;
default:
/* GET_DATA_BUFFER_STATUS xfer handled by scsi_req_xfer */
return scsi_req_xfer(cmd, dev, buf);
}
return 0;
}
static void scsi_cmd_xfer_mode(SCSICommand *cmd)
{
if (!cmd->xfer) {
cmd->mode = SCSI_XFER_NONE;
return;
}
switch (cmd->buf[0]) {
case WRITE_6:
case WRITE_10:
case WRITE_VERIFY_10:
case WRITE_12:
case WRITE_VERIFY_12:
case WRITE_16:
case WRITE_VERIFY_16:
case VERIFY_10:
case VERIFY_12:
case VERIFY_16:
case COPY:
case COPY_VERIFY:
case COMPARE:
case CHANGE_DEFINITION:
case LOG_SELECT:
case MODE_SELECT:
case MODE_SELECT_10:
case SEND_DIAGNOSTIC:
case WRITE_BUFFER:
case FORMAT_UNIT:
case REASSIGN_BLOCKS:
case SEARCH_EQUAL:
case SEARCH_HIGH:
case SEARCH_LOW:
case UPDATE_BLOCK:
case WRITE_LONG_10:
case WRITE_SAME_10:
case WRITE_SAME_16:
case UNMAP:
case SEARCH_HIGH_12:
case SEARCH_EQUAL_12:
case SEARCH_LOW_12:
case MEDIUM_SCAN:
case SEND_VOLUME_TAG:
case SEND_CUE_SHEET:
case SEND_DVD_STRUCTURE:
case PERSISTENT_RESERVE_OUT:
case MAINTENANCE_OUT:
case SET_WINDOW:
case SCAN:
/* SCAN conflicts with START_STOP. START_STOP has cmd->xfer set to 0 for
* non-scanner devices, so we only get here for SCAN and not for START_STOP.
*/
cmd->mode = SCSI_XFER_TO_DEV;
break;
case ATA_PASSTHROUGH_12:
case ATA_PASSTHROUGH_16:
/* T_DIR */
cmd->mode = (cmd->buf[2] & 0x8) ?
SCSI_XFER_FROM_DEV : SCSI_XFER_TO_DEV;
break;
default:
cmd->mode = SCSI_XFER_FROM_DEV;
break;
}
}
int scsi_req_parse_cdb(SCSIDevice *dev, SCSICommand *cmd, uint8_t *buf)
{
int rc;
int len;
cmd->lba = -1;
len = scsi_cdb_length(buf);
if (len < 0) {
return -1;
}
cmd->len = len;
switch (dev->type) {
case TYPE_TAPE:
rc = scsi_req_stream_xfer(cmd, dev, buf);
break;
case TYPE_MEDIUM_CHANGER:
rc = scsi_req_medium_changer_xfer(cmd, dev, buf);
break;
case TYPE_SCANNER:
rc = scsi_req_scanner_length(cmd, dev, buf);
break;
default:
rc = scsi_req_xfer(cmd, dev, buf);
break;
}
if (rc != 0)
return rc;
memcpy(cmd->buf, buf, cmd->len);
scsi_cmd_xfer_mode(cmd);
cmd->lba = scsi_cmd_lba(cmd);
return 0;
}
void scsi_device_report_change(SCSIDevice *dev, SCSISense sense)
{
SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
scsi_device_set_ua(dev, sense);
if (bus->info->change) {
bus->info->change(bus, dev, sense);
}
}
SCSIRequest *scsi_req_ref(SCSIRequest *req)
{
assert(req->refcount > 0);
req->refcount++;
return req;
}
void scsi_req_unref(SCSIRequest *req)
{
assert(req->refcount > 0);
if (--req->refcount == 0) {
BusState *qbus = req->dev->qdev.parent_bus;
SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, qbus);
if (bus->info->free_request && req->hba_private) {
bus->info->free_request(bus, req->hba_private);
}
if (req->ops->free_req) {
req->ops->free_req(req);
}
object_unref(OBJECT(req->dev));
object_unref(OBJECT(qbus->parent));
g_free(req);
}
}
/* Tell the device that we finished processing this chunk of I/O. It
will start the next chunk or complete the command. */
void scsi_req_continue(SCSIRequest *req)
{
if (req->io_canceled) {
trace_scsi_req_continue_canceled(req->dev->id, req->lun, req->tag);
return;
}
trace_scsi_req_continue(req->dev->id, req->lun, req->tag);
if (req->cmd.mode == SCSI_XFER_TO_DEV) {
req->ops->write_data(req);
} else {
req->ops->read_data(req);
}
}
/* Called by the devices when data is ready for the HBA. The HBA should
start a DMA operation to read or fill the device's data buffer.
Once it completes, calling scsi_req_continue will restart I/O. */
void scsi_req_data(SCSIRequest *req, int len)
{
uint8_t *buf;
if (req->io_canceled) {
trace_scsi_req_data_canceled(req->dev->id, req->lun, req->tag, len);
return;
}
trace_scsi_req_data(req->dev->id, req->lun, req->tag, len);
assert(req->cmd.mode != SCSI_XFER_NONE);
if (!req->sg) {
req->resid -= len;
req->bus->info->transfer_data(req, len);
return;
}
/* If the device calls scsi_req_data and the HBA specified a
* scatter/gather list, the transfer has to happen in a single
* step. */
assert(!req->dma_started);
req->dma_started = true;
buf = scsi_req_get_buf(req);
if (req->cmd.mode == SCSI_XFER_FROM_DEV) {
req->resid = dma_buf_read(buf, len, req->sg);
} else {
req->resid = dma_buf_write(buf, len, req->sg);
}
scsi_req_continue(req);
}
void scsi_req_print(SCSIRequest *req)
{
FILE *fp = stderr;
int i;
fprintf(fp, "[%s id=%d] %s",
req->dev->qdev.parent_bus->name,
req->dev->id,
scsi_command_name(req->cmd.buf[0]));
for (i = 1; i < req->cmd.len; i++) {
fprintf(fp, " 0x%02x", req->cmd.buf[i]);
}
switch (req->cmd.mode) {
case SCSI_XFER_NONE:
fprintf(fp, " - none\n");
break;
case SCSI_XFER_FROM_DEV:
fprintf(fp, " - from-dev len=%zd\n", req->cmd.xfer);
break;
case SCSI_XFER_TO_DEV:
fprintf(fp, " - to-dev len=%zd\n", req->cmd.xfer);
break;
default:
fprintf(fp, " - Oops\n");
break;
}
}
void scsi_req_complete(SCSIRequest *req, int status)
{
assert(req->status == -1);
req->status = status;
assert(req->sense_len <= sizeof(req->sense));
if (status == GOOD) {
req->sense_len = 0;
}
if (req->sense_len) {
memcpy(req->dev->sense, req->sense, req->sense_len);
req->dev->sense_len = req->sense_len;
req->dev->sense_is_ua = (req->ops == &reqops_unit_attention);
} else {
req->dev->sense_len = 0;
req->dev->sense_is_ua = false;
}
/*
* Unit attention state is now stored in the device's sense buffer
* if the HBA didn't do autosense. Clear the pending unit attention
* flags.
*/
scsi_clear_unit_attention(req);
scsi_req_ref(req);
scsi_req_dequeue(req);
req->bus->info->complete(req, req->status, req->resid);
/* Cancelled requests might end up being completed instead of cancelled */
notifier_list_notify(&req->cancel_notifiers, req);
scsi_req_unref(req);
}
/* Called by the devices when the request is canceled. */
void scsi_req_cancel_complete(SCSIRequest *req)
{
assert(req->io_canceled);
if (req->bus->info->cancel) {
req->bus->info->cancel(req);
}
notifier_list_notify(&req->cancel_notifiers, req);
scsi_req_unref(req);
}
/* Cancel @req asynchronously. @notifier is added to @req's cancellation
* notifier list, the bus will be notified the requests cancellation is
* completed.
* */
void scsi_req_cancel_async(SCSIRequest *req, Notifier *notifier)
{
trace_scsi_req_cancel(req->dev->id, req->lun, req->tag);
if (notifier) {
notifier_list_add(&req->cancel_notifiers, notifier);
}
if (req->io_canceled) {
/* A blk_aio_cancel_async is pending; when it finishes,
* scsi_req_cancel_complete will be called and will
* call the notifier we just added. Just wait for that.
*/
assert(req->aiocb);
return;
}
/* Dropped in scsi_req_cancel_complete. */
scsi_req_ref(req);
scsi_req_dequeue(req);
req->io_canceled = true;
if (req->aiocb) {
blk_aio_cancel_async(req->aiocb);
} else {
scsi_req_cancel_complete(req);
}
}
void scsi_req_cancel(SCSIRequest *req)
{
trace_scsi_req_cancel(req->dev->id, req->lun, req->tag);
if (!req->enqueued) {
return;
}
assert(!req->io_canceled);
/* Dropped in scsi_req_cancel_complete. */
scsi_req_ref(req);
scsi_req_dequeue(req);
req->io_canceled = true;
if (req->aiocb) {
blk_aio_cancel(req->aiocb);
} else {
scsi_req_cancel_complete(req);
}
}
static int scsi_ua_precedence(SCSISense sense)
{
if (sense.key != UNIT_ATTENTION) {
return INT_MAX;
}
if (sense.asc == 0x29 && sense.ascq == 0x04) {
/* DEVICE INTERNAL RESET goes with POWER ON OCCURRED */
return 1;
} else if (sense.asc == 0x3F && sense.ascq == 0x01) {
/* MICROCODE HAS BEEN CHANGED goes with SCSI BUS RESET OCCURRED */
return 2;
} else if (sense.asc == 0x29 && (sense.ascq == 0x05 || sense.ascq == 0x06)) {
/* These two go with "all others". */
;
} else if (sense.asc == 0x29 && sense.ascq <= 0x07) {
/* POWER ON, RESET OR BUS DEVICE RESET OCCURRED = 0
* POWER ON OCCURRED = 1
* SCSI BUS RESET OCCURRED = 2
* BUS DEVICE RESET FUNCTION OCCURRED = 3
* I_T NEXUS LOSS OCCURRED = 7
*/
return sense.ascq;
} else if (sense.asc == 0x2F && sense.ascq == 0x01) {
/* COMMANDS CLEARED BY POWER LOSS NOTIFICATION */
return 8;
}
return (sense.asc << 8) | sense.ascq;
}
void scsi_device_set_ua(SCSIDevice *sdev, SCSISense sense)
{
int prec1, prec2;
if (sense.key != UNIT_ATTENTION) {
return;
}
trace_scsi_device_set_ua(sdev->id, sdev->lun, sense.key,
sense.asc, sense.ascq);
/*
* Override a pre-existing unit attention condition, except for a more
* important reset condition.
*/
prec1 = scsi_ua_precedence(sdev->unit_attention);
prec2 = scsi_ua_precedence(sense);
if (prec2 < prec1) {
sdev->unit_attention = sense;
}
}
void scsi_device_purge_requests(SCSIDevice *sdev, SCSISense sense)
{
SCSIRequest *req;
aio_context_acquire(blk_get_aio_context(sdev->conf.blk));
while (!QTAILQ_EMPTY(&sdev->requests)) {
req = QTAILQ_FIRST(&sdev->requests);
scsi_req_cancel_async(req, NULL);
}
blk_drain(sdev->conf.blk);
aio_context_release(blk_get_aio_context(sdev->conf.blk));
scsi_device_set_ua(sdev, sense);
}
static char *scsibus_get_dev_path(DeviceState *dev)
{
SCSIDevice *d = SCSI_DEVICE(dev);
DeviceState *hba = dev->parent_bus->parent;
char *id;
char *path;
id = qdev_get_dev_path(hba);
if (id) {
path = g_strdup_printf("%s/%d:%d:%d", id, d->channel, d->id, d->lun);
} else {
path = g_strdup_printf("%d:%d:%d", d->channel, d->id, d->lun);
}
g_free(id);
return path;
}
static char *scsibus_get_fw_dev_path(DeviceState *dev)
{
SCSIDevice *d = SCSI_DEVICE(dev);
return g_strdup_printf("channel@%x/%s@%x,%x", d->channel,
qdev_fw_name(dev), d->id, d->lun);
}
SCSIDevice *scsi_device_find(SCSIBus *bus, int channel, int id, int lun)
{
BusChild *kid;
SCSIDevice *target_dev = NULL;
QTAILQ_FOREACH_REVERSE(kid, &bus->qbus.children, sibling) {
DeviceState *qdev = kid->child;
SCSIDevice *dev = SCSI_DEVICE(qdev);
if (dev->channel == channel && dev->id == id) {
if (dev->lun == lun) {
return dev;
}
target_dev = dev;
}
}
return target_dev;
}
/* SCSI request list. For simplicity, pv points to the whole device */
static int put_scsi_requests(QEMUFile *f, void *pv, size_t size,
const VMStateField *field, QJSON *vmdesc)
{
SCSIDevice *s = pv;
SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, s->qdev.parent_bus);
SCSIRequest *req;
QTAILQ_FOREACH(req, &s->requests, next) {
assert(!req->io_canceled);
assert(req->status == -1);
assert(req->enqueued);
qemu_put_sbyte(f, req->retry ? 1 : 2);
qemu_put_buffer(f, req->cmd.buf, sizeof(req->cmd.buf));
qemu_put_be32s(f, &req->tag);
qemu_put_be32s(f, &req->lun);
if (bus->info->save_request) {
bus->info->save_request(f, req);
}
if (req->ops->save_request) {
req->ops->save_request(f, req);
}
}
qemu_put_sbyte(f, 0);
return 0;
}
static int get_scsi_requests(QEMUFile *f, void *pv, size_t size,
const VMStateField *field)
{
SCSIDevice *s = pv;
SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, s->qdev.parent_bus);
int8_t sbyte;
while ((sbyte = qemu_get_sbyte(f)) > 0) {
uint8_t buf[SCSI_CMD_BUF_SIZE];
uint32_t tag;
uint32_t lun;
SCSIRequest *req;
qemu_get_buffer(f, buf, sizeof(buf));
qemu_get_be32s(f, &tag);
qemu_get_be32s(f, &lun);
req = scsi_req_new(s, tag, lun, buf, NULL);
req->retry = (sbyte == 1);
if (bus->info->load_request) {
req->hba_private = bus->info->load_request(f, req);
}
if (req->ops->load_request) {
req->ops->load_request(f, req);
}
/* Just restart it later. */
scsi_req_enqueue_internal(req);
/* At this point, the request will be kept alive by the reference
* added by scsi_req_enqueue_internal, so we can release our reference.
* The HBA of course will add its own reference in the load_request
* callback if it needs to hold on the SCSIRequest.
*/
scsi_req_unref(req);
}
return 0;
}
static const VMStateInfo vmstate_info_scsi_requests = {
.name = "scsi-requests",
.get = get_scsi_requests,
.put = put_scsi_requests,
};
static bool scsi_sense_state_needed(void *opaque)
{
SCSIDevice *s = opaque;
return s->sense_len > SCSI_SENSE_BUF_SIZE_OLD;
}
static const VMStateDescription vmstate_scsi_sense_state = {
.name = "SCSIDevice/sense",
.version_id = 1,
.minimum_version_id = 1,
.needed = scsi_sense_state_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT8_SUB_ARRAY(sense, SCSIDevice,
SCSI_SENSE_BUF_SIZE_OLD,
SCSI_SENSE_BUF_SIZE - SCSI_SENSE_BUF_SIZE_OLD),
VMSTATE_END_OF_LIST()
}
};
const VMStateDescription vmstate_scsi_device = {
.name = "SCSIDevice",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT8(unit_attention.key, SCSIDevice),
VMSTATE_UINT8(unit_attention.asc, SCSIDevice),
VMSTATE_UINT8(unit_attention.ascq, SCSIDevice),
VMSTATE_BOOL(sense_is_ua, SCSIDevice),
VMSTATE_UINT8_SUB_ARRAY(sense, SCSIDevice, 0, SCSI_SENSE_BUF_SIZE_OLD),
VMSTATE_UINT32(sense_len, SCSIDevice),
{
.name = "requests",
.version_id = 0,
.field_exists = NULL,
.size = 0, /* ouch */
.info = &vmstate_info_scsi_requests,
.flags = VMS_SINGLE,
.offset = 0,
},
VMSTATE_END_OF_LIST()
},
.subsections = (const VMStateDescription*[]) {
&vmstate_scsi_sense_state,
NULL
}
};
static void scsi_device_class_init(ObjectClass *klass, void *data)
{
DeviceClass *k = DEVICE_CLASS(klass);
set_bit(DEVICE_CATEGORY_STORAGE, k->categories);
k->bus_type = TYPE_SCSI_BUS;
k->realize = scsi_qdev_realize;
k->unrealize = scsi_qdev_unrealize;
device_class_set_props(k, scsi_props);
}
static void scsi_dev_instance_init(Object *obj)
{
DeviceState *dev = DEVICE(obj);
SCSIDevice *s = SCSI_DEVICE(dev);
device_add_bootindex_property(obj, &s->conf.bootindex,
"bootindex", NULL,
&s->qdev);
}
static const TypeInfo scsi_device_type_info = {
.name = TYPE_SCSI_DEVICE,
.parent = TYPE_DEVICE,
.instance_size = sizeof(SCSIDevice),
.abstract = true,
.class_size = sizeof(SCSIDeviceClass),
.class_init = scsi_device_class_init,
.instance_init = scsi_dev_instance_init,
};
static void scsi_register_types(void)
{
type_register_static(&scsi_bus_info);
type_register_static(&scsi_device_type_info);
}
type_init(scsi_register_types)
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