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18eef3bc4e
qemu-e2k/hw/scsi-bus.c
Gerd Hoffmann 18eef3bc4e scsi: prepare migration code for usb-storage support 
usb-storage can't handle requests in one go as the data transfer can be
splitted into lots of usb packets.  Because of that there can be
normal in-flight requests at savevm time and we need to handle that.
With other scsi hba's this happens only in case i/o is stopped due to
errors and there are pending requests which need to be restarted
(req->retry = true).

So, first we need to save req->retry and then handle the req->retry =
false case.  Write requests are handled fine already.  For read requests
we have to save the buffer as we will not restart the request (and thus
not refill the buffer) on the target host.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2012-06-07 10:02:21 +02:00

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#include "hw.h"
#include "qemu-error.h"
#include "scsi.h"
#include "scsi-defs.h"
#include "qdev.h"
#include "blockdev.h"
#include "trace.h"
#include "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 struct BusInfo scsi_bus_info = {
.name = "SCSI",
.size = sizeof(SCSIBus),
.get_dev_path = scsibus_get_dev_path,
.get_fw_dev_path = scsibus_get_fw_dev_path,
.props = (Property[]) {
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 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, DeviceState *host, const SCSIBusInfo *info)
{
qbus_create_inplace(&bus->qbus, &scsi_bus_info, host, NULL);
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) {
qdev_free(&d->qdev);
}
}
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);
}
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 *driver;
DeviceState *dev;
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 (qdev_prop_exists(dev, "removable")) {
qdev_prop_set_bit(dev, "removable", removable);
}
if (qdev_prop_set_drive(dev, "drive", bdrv) < 0) {
qdev_free(dev);
return NULL;
}
if (qdev_init(dev) < 0)
return NULL;
return SCSI_DEVICE(dev);
}
int scsi_bus_legacy_handle_cmdline(SCSIBus *bus)
{
Location loc;
DriveInfo *dinfo;
int res = 0, 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);
if (!scsi_bus_legacy_add_drive(bus, dinfo->bdrv, unit, false, -1)) {
res = -1;
break;
}
}
loc_pop(&loc);
return res;
}
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 && 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[2056];
};
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)
{
DeviceState *qdev;
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(qdev, &r->req.bus->qbus.children, sibling) {
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;
}
len = MIN(n + 8, r->req.cmd.xfer & ~7);
if (len > sizeof(r->buf)) {
/* TODO: > 256 LUNs? */
return false;
}
memset(r->buf, 0, len);
stl_be_p(&r->buf, n);
i = found_lun0 ? 8 : 16;
QTAILQ_FOREACH(qdev, &r->req.bus->qbus.children, sibling) {
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);
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 < sizeof(r->buf));
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, 36);
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);
strncpy((char *) &r->buf[32], QEMU_VERSION, 4);
}
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:
r->len = scsi_device_get_sense(r->req.dev, r->buf,
MIN(req->cmd.xfer, sizeof r->buf),
(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;
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 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,
};
SCSIRequest *scsi_req_alloc(const SCSIReqOps *reqops, SCSIDevice *d,
uint32_t tag, uint32_t lun, void *hba_private)
{
SCSIRequest *req;
req = g_malloc0(reqops->size);
req->refcount = 1;
req->bus = scsi_bus_from_device(d);
req->dev = d;
req->tag = tag;
req->lun = lun;
req->hba_private = hba_private;
req->status = -1;
req->sense_len = 0;
req->ops = reqops;
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 scsi_req_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
{
switch (buf[0] >> 5) {
case 0:
cmd->xfer = buf[4];
cmd->len = 6;
break;
case 1:
case 2:
cmd->xfer = lduw_be_p(&buf[7]);
cmd->len = 10;
break;
case 4:
cmd->xfer = ldl_be_p(&buf[10]) & 0xffffffffULL;
cmd->len = 16;
break;
case 5:
cmd->xfer = ldl_be_p(&buf[6]) & 0xffffffffULL;
cmd->len = 12;
break;
default:
return -1;
}
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 VERIFY_10:
case SEEK_10:
case SYNCHRONIZE_CACHE:
case SYNCHRONIZE_CACHE_16:
case LOCATE_16:
case LOCK_UNLOCK_CACHE:
case LOAD_UNLOAD:
case SET_CD_SPEED:
case SET_LIMITS:
case WRITE_LONG_10:
case MOVE_MEDIUM:
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 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);
}
break;
}
return 0;
}
static int scsi_req_stream_length(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->len = 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->len = 16;
cmd->xfer = buf[14] | (buf[13] << 8) | (buf[12] << 16);
if (buf[1] & 0x01) { /* fixed */
cmd->xfer *= dev->blocksize;
}
break;
case REWIND:
case START_STOP:
cmd->len = 6;
cmd->xfer = 0;
break;
case SPACE_16:
cmd->xfer = buf[13] | (buf[12] << 8);
break;
case READ_POSITION:
cmd->xfer = buf[8] | (buf[7] << 8);
break;
case FORMAT_UNIT:
cmd->xfer = buf[4] | (buf[3] << 8);
break;
/* generic commands */
default:
return scsi_req_length(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 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 ATA_PASSTHROUGH:
cmd->mode = SCSI_XFER_TO_DEV;
break;
default:
cmd->mode = SCSI_XFER_FROM_DEV;
break;
}
}
static uint64_t scsi_cmd_lba(SCSICommand *cmd)
{
uint8_t *buf = cmd->buf;
uint64_t lba;
switch (buf[0] >> 5) {
case 0:
lba = ldl_be_p(&buf[0]) & 0x1fffff;
break;
case 1:
case 2:
case 5:
lba = ldl_be_p(&buf[2]) & 0xffffffffULL;
break;
case 4:
lba = ldq_be_p(&buf[2]);
break;
default:
lba = -1;
}
return lba;
}
int scsi_req_parse(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf)
{
int rc;
if (dev->type == TYPE_TAPE) {
rc = scsi_req_stream_length(cmd, dev, buf);
} else {
rc = scsi_req_length(cmd, dev, buf);
}
if (rc != 0)
return rc;
memcpy(cmd->buf, buf, cmd->len);
scsi_cmd_xfer_mode(cmd);
cmd->lba = scsi_cmd_lba(cmd);
return 0;
}
/*
* Predefined sense codes
*/
/* No sense data available */
const struct SCSISense sense_code_NO_SENSE = {
.key = NO_SENSE , .asc = 0x00 , .ascq = 0x00
};
/* LUN not ready, Manual intervention required */
const struct SCSISense sense_code_LUN_NOT_READY = {
.key = NOT_READY, .asc = 0x04, .ascq = 0x03
};
/* LUN not ready, Medium not present */
const struct SCSISense sense_code_NO_MEDIUM = {
.key = NOT_READY, .asc = 0x3a, .ascq = 0x00
};
/* LUN not ready, medium removal prevented */
const struct SCSISense sense_code_NOT_READY_REMOVAL_PREVENTED = {
.key = NOT_READY, .asc = 0x53, .ascq = 0x00
};
/* Hardware error, internal target failure */
const struct SCSISense sense_code_TARGET_FAILURE = {
.key = HARDWARE_ERROR, .asc = 0x44, .ascq = 0x00
};
/* Illegal request, invalid command operation code */
const struct SCSISense sense_code_INVALID_OPCODE = {
.key = ILLEGAL_REQUEST, .asc = 0x20, .ascq = 0x00
};
/* Illegal request, LBA out of range */
const struct SCSISense sense_code_LBA_OUT_OF_RANGE = {
.key = ILLEGAL_REQUEST, .asc = 0x21, .ascq = 0x00
};
/* Illegal request, Invalid field in CDB */
const struct SCSISense sense_code_INVALID_FIELD = {
.key = ILLEGAL_REQUEST, .asc = 0x24, .ascq = 0x00
};
/* Illegal request, LUN not supported */
const struct SCSISense sense_code_LUN_NOT_SUPPORTED = {
.key = ILLEGAL_REQUEST, .asc = 0x25, .ascq = 0x00
};
/* Illegal request, Saving parameters not supported */
const struct SCSISense sense_code_SAVING_PARAMS_NOT_SUPPORTED = {
.key = ILLEGAL_REQUEST, .asc = 0x39, .ascq = 0x00
};
/* Illegal request, Incompatible medium installed */
const struct SCSISense sense_code_INCOMPATIBLE_FORMAT = {
.key = ILLEGAL_REQUEST, .asc = 0x30, .ascq = 0x00
};
/* Illegal request, medium removal prevented */
const struct SCSISense sense_code_ILLEGAL_REQ_REMOVAL_PREVENTED = {
.key = ILLEGAL_REQUEST, .asc = 0x53, .ascq = 0x00
};
/* Command aborted, I/O process terminated */
const struct SCSISense sense_code_IO_ERROR = {
.key = ABORTED_COMMAND, .asc = 0x00, .ascq = 0x06
};
/* Command aborted, I_T Nexus loss occurred */
const struct SCSISense sense_code_I_T_NEXUS_LOSS = {
.key = ABORTED_COMMAND, .asc = 0x29, .ascq = 0x07
};
/* Command aborted, Logical Unit failure */
const struct SCSISense sense_code_LUN_FAILURE = {
.key = ABORTED_COMMAND, .asc = 0x3e, .ascq = 0x01
};
/* Unit attention, Power on, reset or bus device reset occurred */
const struct SCSISense sense_code_RESET = {
.key = UNIT_ATTENTION, .asc = 0x29, .ascq = 0x00
};
/* Unit attention, No medium */
const struct SCSISense sense_code_UNIT_ATTENTION_NO_MEDIUM = {
.key = UNIT_ATTENTION, .asc = 0x3a, .ascq = 0x00
};
/* Unit attention, Medium may have changed */
const struct SCSISense sense_code_MEDIUM_CHANGED = {
.key = UNIT_ATTENTION, .asc = 0x28, .ascq = 0x00
};
/* Unit attention, Reported LUNs data has changed */
const struct SCSISense sense_code_REPORTED_LUNS_CHANGED = {
.key = UNIT_ATTENTION, .asc = 0x3f, .ascq = 0x0e
};
/* Unit attention, Device internal reset */
const struct SCSISense sense_code_DEVICE_INTERNAL_RESET = {
.key = UNIT_ATTENTION, .asc = 0x29, .ascq = 0x04
};
/*
* scsi_build_sense
*
* Convert between fixed and descriptor sense buffers
*/
int scsi_build_sense(uint8_t *in_buf, int in_len,
uint8_t *buf, int len, bool fixed)
{
bool fixed_in;
SCSISense sense;
if (!fixed && len < 8) {
return 0;
}
if (in_len == 0) {
sense.key = NO_SENSE;
sense.asc = 0;
sense.ascq = 0;
} else {
fixed_in = (in_buf[0] & 2) == 0;
if (fixed == fixed_in) {
memcpy(buf, in_buf, MIN(len, in_len));
return MIN(len, in_len);
}
if (fixed_in) {
sense.key = in_buf[2];
sense.asc = in_buf[12];
sense.ascq = in_buf[13];
} else {
sense.key = in_buf[1];
sense.asc = in_buf[2];
sense.ascq = in_buf[3];
}
}
memset(buf, 0, len);
if (fixed) {
/* Return fixed format sense buffer */
buf[0] = 0x70;
buf[2] = sense.key;
buf[7] = 10;
buf[12] = sense.asc;
buf[13] = sense.ascq;
return MIN(len, 18);
} else {
/* Return descriptor format sense buffer */
buf[0] = 0x72;
buf[1] = sense.key;
buf[2] = sense.asc;
buf[3] = sense.ascq;
return 8;
}
}
static const char *scsi_command_name(uint8_t cmd)
{
static const char *names[] = {
[ TEST_UNIT_READY ] = "TEST_UNIT_READY",
[ REWIND ] = "REWIND",
[ REQUEST_SENSE ] = "REQUEST_SENSE",
[ FORMAT_UNIT ] = "FORMAT_UNIT",
[ READ_BLOCK_LIMITS ] = "READ_BLOCK_LIMITS",
[ REASSIGN_BLOCKS ] = "REASSIGN_BLOCKS",
[ READ_6 ] = "READ_6",
[ WRITE_6 ] = "WRITE_6",
[ SET_CAPACITY ] = "SET_CAPACITY",
[ READ_REVERSE ] = "READ_REVERSE",
[ WRITE_FILEMARKS ] = "WRITE_FILEMARKS",
[ SPACE ] = "SPACE",
[ INQUIRY ] = "INQUIRY",
[ RECOVER_BUFFERED_DATA ] = "RECOVER_BUFFERED_DATA",
[ MAINTENANCE_IN ] = "MAINTENANCE_IN",
[ MAINTENANCE_OUT ] = "MAINTENANCE_OUT",
[ MODE_SELECT ] = "MODE_SELECT",
[ RESERVE ] = "RESERVE",
[ RELEASE ] = "RELEASE",
[ COPY ] = "COPY",
[ ERASE ] = "ERASE",
[ MODE_SENSE ] = "MODE_SENSE",
[ START_STOP ] = "START_STOP",
[ RECEIVE_DIAGNOSTIC ] = "RECEIVE_DIAGNOSTIC",
[ SEND_DIAGNOSTIC ] = "SEND_DIAGNOSTIC",
[ ALLOW_MEDIUM_REMOVAL ] = "ALLOW_MEDIUM_REMOVAL",
[ READ_CAPACITY_10 ] = "READ_CAPACITY_10",
[ READ_10 ] = "READ_10",
[ WRITE_10 ] = "WRITE_10",
[ SEEK_10 ] = "SEEK_10",
[ WRITE_VERIFY_10 ] = "WRITE_VERIFY_10",
[ VERIFY_10 ] = "VERIFY_10",
[ SEARCH_HIGH ] = "SEARCH_HIGH",
[ SEARCH_EQUAL ] = "SEARCH_EQUAL",
[ SEARCH_LOW ] = "SEARCH_LOW",
[ SET_LIMITS ] = "SET_LIMITS",
[ PRE_FETCH ] = "PRE_FETCH/READ_POSITION",
/* READ_POSITION and PRE_FETCH use the same operation code */
[ SYNCHRONIZE_CACHE ] = "SYNCHRONIZE_CACHE",
[ LOCK_UNLOCK_CACHE ] = "LOCK_UNLOCK_CACHE",
[ READ_DEFECT_DATA ] = "READ_DEFECT_DATA",
[ MEDIUM_SCAN ] = "MEDIUM_SCAN",
[ COMPARE ] = "COMPARE",
[ COPY_VERIFY ] = "COPY_VERIFY",
[ WRITE_BUFFER ] = "WRITE_BUFFER",
[ READ_BUFFER ] = "READ_BUFFER",
[ UPDATE_BLOCK ] = "UPDATE_BLOCK",
[ READ_LONG_10 ] = "READ_LONG_10",
[ WRITE_LONG_10 ] = "WRITE_LONG_10",
[ CHANGE_DEFINITION ] = "CHANGE_DEFINITION",
[ WRITE_SAME_10 ] = "WRITE_SAME_10",
[ UNMAP ] = "UNMAP",
[ READ_TOC ] = "READ_TOC",
[ REPORT_DENSITY_SUPPORT ] = "REPORT_DENSITY_SUPPORT",
[ SANITIZE ] = "SANITIZE",
[ GET_CONFIGURATION ] = "GET_CONFIGURATION",
[ LOG_SELECT ] = "LOG_SELECT",
[ LOG_SENSE ] = "LOG_SENSE",
[ MODE_SELECT_10 ] = "MODE_SELECT_10",
[ RESERVE_10 ] = "RESERVE_10",
[ RELEASE_10 ] = "RELEASE_10",
[ MODE_SENSE_10 ] = "MODE_SENSE_10",
[ PERSISTENT_RESERVE_IN ] = "PERSISTENT_RESERVE_IN",
[ PERSISTENT_RESERVE_OUT ] = "PERSISTENT_RESERVE_OUT",
[ WRITE_FILEMARKS_16 ] = "WRITE_FILEMARKS_16",
[ EXTENDED_COPY ] = "EXTENDED_COPY",
[ ATA_PASSTHROUGH ] = "ATA_PASSTHROUGH",
[ ACCESS_CONTROL_IN ] = "ACCESS_CONTROL_IN",
[ ACCESS_CONTROL_OUT ] = "ACCESS_CONTROL_OUT",
[ READ_16 ] = "READ_16",
[ COMPARE_AND_WRITE ] = "COMPARE_AND_WRITE",
[ WRITE_16 ] = "WRITE_16",
[ WRITE_VERIFY_16 ] = "WRITE_VERIFY_16",
[ VERIFY_16 ] = "VERIFY_16",
[ PRE_FETCH_16 ] = "PRE_FETCH_16",
[ SYNCHRONIZE_CACHE_16 ] = "SPACE_16/SYNCHRONIZE_CACHE_16",
/* SPACE_16 and SYNCHRONIZE_CACHE_16 use the same operation code */
[ LOCATE_16 ] = "LOCATE_16",
[ WRITE_SAME_16 ] = "ERASE_16/WRITE_SAME_16",
/* ERASE_16 and WRITE_SAME_16 use the same operation code */
[ SERVICE_ACTION_IN_16 ] = "SERVICE_ACTION_IN_16",
[ WRITE_LONG_16 ] = "WRITE_LONG_16",
[ REPORT_LUNS ] = "REPORT_LUNS",
[ BLANK ] = "BLANK",
[ MOVE_MEDIUM ] = "MOVE_MEDIUM",
[ LOAD_UNLOAD ] = "LOAD_UNLOAD",
[ READ_12 ] = "READ_12",
[ WRITE_12 ] = "WRITE_12",
[ ERASE_12 ] = "ERASE_12/GET_PERFORMANCE",
/* ERASE_12 and GET_PERFORMANCE use the same operation code */
[ SERVICE_ACTION_IN_12 ] = "SERVICE_ACTION_IN_12",
[ WRITE_VERIFY_12 ] = "WRITE_VERIFY_12",
[ VERIFY_12 ] = "VERIFY_12",
[ SEARCH_HIGH_12 ] = "SEARCH_HIGH_12",
[ SEARCH_EQUAL_12 ] = "SEARCH_EQUAL_12",
[ SEARCH_LOW_12 ] = "SEARCH_LOW_12",
[ READ_ELEMENT_STATUS ] = "READ_ELEMENT_STATUS",
[ SEND_VOLUME_TAG ] = "SEND_VOLUME_TAG/SET_STREAMING",
/* SEND_VOLUME_TAG and SET_STREAMING use the same operation code */
[ READ_CD ] = "READ_CD",
[ READ_DEFECT_DATA_12 ] = "READ_DEFECT_DATA_12",
[ READ_DVD_STRUCTURE ] = "READ_DVD_STRUCTURE",
[ RESERVE_TRACK ] = "RESERVE_TRACK",
[ SEND_CUE_SHEET ] = "SEND_CUE_SHEET",
[ SEND_DVD_STRUCTURE ] = "SEND_DVD_STRUCTURE",
[ SET_CD_SPEED ] = "SET_CD_SPEED",
[ SET_READ_AHEAD ] = "SET_READ_AHEAD",
[ ALLOW_OVERWRITE ] = "ALLOW_OVERWRITE",
[ MECHANISM_STATUS ] = "MECHANISM_STATUS",
};
if (cmd >= ARRAY_SIZE(names) || names[cmd] == NULL)
return "*UNKNOWN*";
return names[cmd];
}
SCSIRequest *scsi_req_ref(SCSIRequest *req)
{
req->refcount++;
return req;
}
void scsi_req_unref(SCSIRequest *req)
{
assert(req->refcount > 0);
if (--req->refcount == 0) {
if (req->ops->free_req) {
req->ops->free_req(req);
}
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)
{
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);
scsi_req_unref(req);
}
void scsi_req_cancel(SCSIRequest *req)
{
if (!req->enqueued) {
return;
}
scsi_req_ref(req);
scsi_req_dequeue(req);
req->io_canceled = true;
if (req->ops->cancel_io) {
req->ops->cancel_io(req);
}
if (req->bus->info->cancel) {
req->bus->info->cancel(req);
}
scsi_req_unref(req);
}
void scsi_req_abort(SCSIRequest *req, int status)
{
if (!req->enqueued) {
return;
}
scsi_req_ref(req);
scsi_req_dequeue(req);
req->io_canceled = true;
if (req->ops->cancel_io) {
req->ops->cancel_io(req);
}
scsi_req_complete(req, status);
scsi_req_unref(req);
}
void scsi_device_purge_requests(SCSIDevice *sdev, SCSISense sense)
{
SCSIRequest *req;
while (!QTAILQ_EMPTY(&sdev->requests)) {
req = QTAILQ_FIRST(&sdev->requests);
scsi_req_cancel(req);
}
sdev->unit_attention = sense;
}
static char *scsibus_get_dev_path(DeviceState *dev)
{
SCSIDevice *d = DO_UPCAST(SCSIDevice, qdev, dev);
DeviceState *hba = dev->parent_bus->parent;
char *id = NULL;
char *path;
if (hba && hba->parent_bus && hba->parent_bus->info->get_dev_path) {
id = hba->parent_bus->info->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);
char path[100];
snprintf(path, sizeof(path), "channel@%x/%s@%x,%x", d->channel,
qdev_fw_name(dev), d->id, d->lun);
return strdup(path);
}
SCSIDevice *scsi_device_find(SCSIBus *bus, int channel, int id, int lun)
{
DeviceState *qdev;
SCSIDevice *target_dev = NULL;
QTAILQ_FOREACH_REVERSE(qdev, &bus->qbus.children, ChildrenHead, sibling) {
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 void put_scsi_requests(QEMUFile *f, void *pv, size_t size)
{
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);
}
static int get_scsi_requests(QEMUFile *f, void *pv, size_t size)
{
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,
};
const VMStateDescription vmstate_scsi_device = {
.name = "SCSIDevice",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 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_ARRAY(sense, SCSIDevice, SCSI_SENSE_BUF_SIZE),
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()
}
};
static void scsi_device_class_init(ObjectClass *klass, void *data)
{
DeviceClass *k = DEVICE_CLASS(klass);
k->bus_info = &scsi_bus_info;
k->init = scsi_qdev_init;
k->unplug = qdev_simple_unplug_cb;
k->exit = scsi_qdev_exit;
}
static 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,
};
static void scsi_register_types(void)
{
type_register_static(&scsi_device_type_info);
}
type_init(scsi_register_types)
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