/
scsi-bus.c
1954 lines (1752 loc) · 55 KB
/
scsi-bus.c
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#include "hw/hw.h"
#include "qemu/error-report.h"
#include "hw/scsi/scsi.h"
#include "block/scsi.h"
#include "hw/qdev.h"
#include "sysemu/blockdev.h"
#include "trace.h"
#include "sysemu/dma.h"
static char *scsibus_get_dev_path(DeviceState *dev);
static char *scsibus_get_fw_dev_path(DeviceState *dev);
static int scsi_req_parse(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf);
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);
k->get_dev_path = scsibus_get_dev_path;
k->get_fw_dev_path = scsibus_get_fw_dev_path;
}
static const TypeInfo scsi_bus_info = {
.name = TYPE_SCSI_BUS,
.parent = TYPE_BUS,
.instance_size = sizeof(SCSIBus),
.class_init = scsi_bus_class_init,
};
static int next_scsi_bus;
static int scsi_device_init(SCSIDevice *s)
{
SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s);
if (sc->init) {
return sc->init(s);
}
return 0;
}
static void scsi_device_destroy(SCSIDevice *s)
{
SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s);
if (sc->destroy) {
sc->destroy(s);
}
}
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;
}
static 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;
bus->qbus.allow_hotplug = 1;
}
static void scsi_dma_restart_bh(void *opaque)
{
SCSIDevice *s = opaque;
SCSIRequest *req, *next;
qemu_bh_delete(s->bh);
s->bh = NULL;
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:
assert(!req->sg);
scsi_req_dequeue(req);
scsi_req_enqueue(req);
break;
}
}
scsi_req_unref(req);
}
}
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) {
s->bh = qemu_bh_new(scsi_dma_restart_bh, s);
qemu_bh_schedule(s->bh);
}
}
static int scsi_qdev_init(DeviceState *qdev)
{
SCSIDevice *dev = SCSI_DEVICE(qdev);
SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
SCSIDevice *d;
int rc = -1;
if (dev->channel > bus->info->max_channel) {
error_report("bad scsi channel id: %d", dev->channel);
goto err;
}
if (dev->id != -1 && dev->id > bus->info->max_target) {
error_report("bad scsi device id: %d", dev->id);
goto err;
}
if (dev->lun != -1 && dev->lun > bus->info->max_lun) {
error_report("bad scsi device lun: %d", dev->lun);
goto err;
}
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_report("no free target");
goto err;
}
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_report("no free lun");
goto err;
}
dev->lun = lun;
} else {
d = scsi_device_find(bus, dev->channel, dev->id, dev->lun);
assert(d);
if (d->lun == dev->lun && dev != d) {
object_unparent(OBJECT(d));
}
}
QTAILQ_INIT(&dev->requests);
rc = scsi_device_init(dev);
if (rc == 0) {
dev->vmsentry = qemu_add_vm_change_state_handler(scsi_dma_restart_cb,
dev);
}
if (bus->info->hotplug) {
bus->info->hotplug(bus, dev);
}
err:
return rc;
}
static int scsi_qdev_exit(DeviceState *qdev)
{
SCSIDevice *dev = SCSI_DEVICE(qdev);
if (dev->vmsentry) {
qemu_del_vm_change_state_handler(dev->vmsentry);
}
scsi_device_destroy(dev);
return 0;
}
/* handle legacy '-drive if=scsi,...' cmd line args */
SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, BlockDriverState *bdrv,
int unit, bool removable, int bootindex,
const char *serial, Error **errp)
{
const char *driver;
DeviceState *dev;
Error *err = NULL;
driver = bdrv_is_sg(bdrv) ? "scsi-generic" : "scsi-disk";
dev = qdev_create(&bus->qbus, driver);
qdev_prop_set_uint32(dev, "scsi-id", unit);
if (bootindex >= 0) {
qdev_prop_set_int32(dev, "bootindex", bootindex);
}
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);
}
if (qdev_prop_set_drive(dev, "drive", bdrv) < 0) {
error_setg(errp, "Setting drive property failed");
object_unparent(OBJECT(dev));
return NULL;
}
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, Error **errp)
{
Location loc;
DriveInfo *dinfo;
int unit;
Error *err = NULL;
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, dinfo->bdrv, unit, false, -1, NULL,
&err);
if (err != NULL) {
error_propagate(errp, err);
break;
}
}
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_get_version());
}
return true;
}
static int32_t scsi_target_send_command(SCSIRequest *req, uint8_t *buf)
{
SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req);
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);
r->len = scsi_device_get_sense(r->req.dev, r->buf,
MIN(req->cmd.xfer, r->buf_len),
(req->cmd.buf[1] & 1) == 0);
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(LUN_NOT_SUPPORTED));
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);
req = g_malloc0(reqops->size);
req->refcount = 1;
req->bus = bus;
req->dev = d;
req->tag = tag;
req->lun = lun;
req->hba_private = hba_private;
req->status = -1;
req->sense_len = 0;
req->ops = reqops;
object_ref(OBJECT(d));
object_ref(OBJECT(qbus->parent));
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);
SCSIRequest *req;
SCSICommand cmd;
if (scsi_req_parse(&cmd, d, buf) != 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 {
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 ((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))) {
req = scsi_req_alloc(&reqops_unit_attention, d, tag, lun,
hba_private);
} else if (lun != d->lun ||
buf[0] == REPORT_LUNS ||
(buf[0] == REQUEST_SENSE && d->sense_len)) {
req = scsi_req_alloc(&reqops_target_command, 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_build_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_build_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);
memset(req->sense, 0, 18);
req->sense[0] = 0x70;
req->sense[2] = sense.key;
req->sense[7] = 10;
req->sense[12] = sense.asc;
req->sense[13] = sense.ascq;
req->sense_len = 18;
}
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_size(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_size(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;
}
uint32_t scsi_data_cdb_length(uint8_t *buf)
{
if ((buf[0] >> 5) == 0 && buf[4] == 0) {
return 256;
} else {
return scsi_cdb_length(buf);
}
}
uint32_t scsi_cdb_length(uint8_t *buf)
{
switch (buf[0] >> 5) {
case 0:
return buf[4];
break;
case 1:
case 2:
return lduw_be_p(&buf[7]);
break;
case 4:
return ldl_be_p(&buf[10]) & 0xffffffffULL;
break;
case 5:
return ldl_be_p(&buf[6]) & 0xffffffffULL;
break;
default:
return -1;
}
}
static int scsi_req_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
{
cmd->xfer = scsi_cdb_length(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) == 1) {
cmd->xfer = 1;
}
cmd->xfer *= dev->blocksize;
break;
case MODE_SENSE:
break;
case WRITE_SAME_10:
case WRITE_SAME_16:
cmd->xfer = 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;
}
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;
}
case READ_10:
case RECOVER_BUFFERED_DATA:
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);
}