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b45ef674f4
qemu/hw/scsi-bus.c
Paolo Bonzini b45ef674f4 scsi: move sense handling to generic code 
With this patch, sense data is stored in the generic data structures
for SCSI devices and requests.  The SCSI layer takes care of storing
sense data in the SCSIDevice for the subsequent REQUEST SENSE command.

At the same time, get_sense is removed and scsi_req_get_sense can use
an entirely generic implementation.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-08-12 08:27:30 -05:00

802 lines
23 KiB
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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"
static char *scsibus_get_fw_dev_path(DeviceState *dev);
static int scsi_build_sense(uint8_t *in_buf, int in_len,
uint8_t *buf, int len, bool fixed);
static struct BusInfo scsi_bus_info = {
.name = "SCSI",
.size = sizeof(SCSIBus),
.get_fw_dev_path = scsibus_get_fw_dev_path,
.props = (Property[]) {
DEFINE_PROP_UINT32("scsi-id", SCSIDevice, id, -1),
DEFINE_PROP_END_OF_LIST(),
},
};
static int next_scsi_bus;
/* Create a scsi bus, and attach devices to it. */
void scsi_bus_new(SCSIBus *bus, DeviceState *host, int tcq, int ndev,
const SCSIBusOps *ops)
{
qbus_create_inplace(&bus->qbus, &scsi_bus_info, host, NULL);
bus->busnr = next_scsi_bus++;
bus->tcq = tcq;
bus->ndev = ndev;
bus->ops = ops;
bus->qbus.allow_hotplug = 1;
}
static int scsi_qdev_init(DeviceState *qdev, DeviceInfo *base)
{
SCSIDevice *dev = DO_UPCAST(SCSIDevice, qdev, qdev);
SCSIDeviceInfo *info = DO_UPCAST(SCSIDeviceInfo, qdev, base);
SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
int rc = -1;
if (dev->id == -1) {
for (dev->id = 0; dev->id < bus->ndev; dev->id++) {
if (bus->devs[dev->id] == NULL)
break;
}
}
if (dev->id >= bus->ndev) {
error_report("bad scsi device id: %d", dev->id);
goto err;
}
if (bus->devs[dev->id]) {
qdev_free(&bus->devs[dev->id]->qdev);
}
bus->devs[dev->id] = dev;
dev->info = info;
QTAILQ_INIT(&dev->requests);
rc = dev->info->init(dev);
if (rc != 0) {
bus->devs[dev->id] = NULL;
}
err:
return rc;
}
static int scsi_qdev_exit(DeviceState *qdev)
{
SCSIDevice *dev = DO_UPCAST(SCSIDevice, qdev, qdev);
SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
assert(bus->devs[dev->id] != NULL);
if (bus->devs[dev->id]->info->destroy) {
bus->devs[dev->id]->info->destroy(bus->devs[dev->id]);
}
bus->devs[dev->id] = NULL;
return 0;
}
void scsi_qdev_register(SCSIDeviceInfo *info)
{
info->qdev.bus_info = &scsi_bus_info;
info->qdev.init = scsi_qdev_init;
info->qdev.unplug = qdev_simple_unplug_cb;
info->qdev.exit = scsi_qdev_exit;
qdev_register(&info->qdev);
}
/* handle legacy '-drive if=scsi,...' cmd line args */
SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, BlockDriverState *bdrv,
int unit, bool removable)
{
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 (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 DO_UPCAST(SCSIDevice, qdev, 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->ndev; 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)) {
res = -1;
break;
}
}
loc_pop(&loc);
return res;
}
SCSIRequest *scsi_req_alloc(size_t size, SCSIDevice *d, uint32_t tag,
uint32_t lun, void *hba_private)
{
SCSIRequest *req;
req = qemu_mallocz(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;
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,
void *hba_private)
{
return d->info->alloc_req(d, tag, lun, hba_private);
}
uint8_t *scsi_req_get_buf(SCSIRequest *req)
{
return req->dev->info->get_buf(req);
}
int scsi_req_get_sense(SCSIRequest *req, uint8_t *buf, int len)
{
assert(len >= 14);
if (!req->sense_len) {
return 0;
}
return scsi_build_sense(req->sense, req->sense_len, buf, len, true);
}
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] = 0xf0;
req->sense[2] = sense.key;
req->sense[12] = sense.asc;
req->sense[13] = sense.ascq;
req->sense_len = 18;
}
int32_t scsi_req_enqueue(SCSIRequest *req, uint8_t *buf)
{
int32_t rc;
assert(!req->enqueued);
scsi_req_ref(req);
req->enqueued = true;
QTAILQ_INSERT_TAIL(&req->dev->requests, req, next);
scsi_req_ref(req);
rc = req->dev->info->send_command(req, 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);
if (req->enqueued) {
QTAILQ_REMOVE(&req->dev->requests, req, next);
req->enqueued = false;
scsi_req_unref(req);
}
}
static int scsi_req_length(SCSIRequest *req, uint8_t *cmd)
{
switch (cmd[0] >> 5) {
case 0:
req->cmd.xfer = cmd[4];
req->cmd.len = 6;
/* length 0 means 256 blocks */
if (req->cmd.xfer == 0)
req->cmd.xfer = 256;
break;
case 1:
case 2:
req->cmd.xfer = cmd[8] | (cmd[7] << 8);
req->cmd.len = 10;
break;
case 4:
req->cmd.xfer = cmd[13] | (cmd[12] << 8) | (cmd[11] << 16) | (cmd[10] << 24);
req->cmd.len = 16;
break;
case 5:
req->cmd.xfer = cmd[9] | (cmd[8] << 8) | (cmd[7] << 16) | (cmd[6] << 24);
req->cmd.len = 12;
break;
default:
trace_scsi_req_parse_bad(req->dev->id, req->lun, req->tag, cmd[0]);
return -1;
}
switch(cmd[0]) {
case TEST_UNIT_READY:
case REWIND:
case START_STOP:
case SEEK_6:
case WRITE_FILEMARKS:
case SPACE:
case RESERVE:
case RELEASE:
case ERASE:
case ALLOW_MEDIUM_REMOVAL:
case VERIFY_10:
case SEEK_10:
case SYNCHRONIZE_CACHE:
case LOCK_UNLOCK_CACHE:
case LOAD_UNLOAD:
case SET_CD_SPEED:
case SET_LIMITS:
case WRITE_LONG_10:
case MOVE_MEDIUM:
case UPDATE_BLOCK:
req->cmd.xfer = 0;
break;
case MODE_SENSE:
break;
case WRITE_SAME_10:
req->cmd.xfer = 1;
break;
case READ_CAPACITY_10:
req->cmd.xfer = 8;
break;
case READ_BLOCK_LIMITS:
req->cmd.xfer = 6;
break;
case READ_POSITION:
req->cmd.xfer = 20;
break;
case SEND_VOLUME_TAG:
req->cmd.xfer *= 40;
break;
case MEDIUM_SCAN:
req->cmd.xfer *= 8;
break;
case WRITE_10:
case WRITE_VERIFY_10:
case WRITE_6:
case WRITE_12:
case WRITE_VERIFY_12:
case WRITE_16:
case WRITE_VERIFY_16:
req->cmd.xfer *= req->dev->blocksize;
break;
case READ_10:
case READ_6:
case READ_REVERSE:
case RECOVER_BUFFERED_DATA:
case READ_12:
case READ_16:
req->cmd.xfer *= req->dev->blocksize;
break;
case INQUIRY:
req->cmd.xfer = cmd[4] | (cmd[3] << 8);
break;
case MAINTENANCE_OUT:
case MAINTENANCE_IN:
if (req->dev->type == TYPE_ROM) {
/* GPCMD_REPORT_KEY and GPCMD_SEND_KEY from multi media commands */
req->cmd.xfer = cmd[9] | (cmd[8] << 8);
}
break;
}
return 0;
}
static int scsi_req_stream_length(SCSIRequest *req, uint8_t *cmd)
{
switch(cmd[0]) {
/* stream commands */
case READ_6:
case READ_REVERSE:
case RECOVER_BUFFERED_DATA:
case WRITE_6:
req->cmd.len = 6;
req->cmd.xfer = cmd[4] | (cmd[3] << 8) | (cmd[2] << 16);
if (cmd[1] & 0x01) /* fixed */
req->cmd.xfer *= req->dev->blocksize;
break;
case REWIND:
case START_STOP:
req->cmd.len = 6;
req->cmd.xfer = 0;
break;
/* generic commands */
default:
return scsi_req_length(req, cmd);
}
return 0;
}
static void scsi_req_xfer_mode(SCSIRequest *req)
{
switch (req->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 SEARCH_HIGH_12:
case SEARCH_EQUAL_12:
case SEARCH_LOW_12:
case MEDIUM_SCAN:
case SEND_VOLUME_TAG:
case PERSISTENT_RESERVE_OUT:
case MAINTENANCE_OUT:
req->cmd.mode = SCSI_XFER_TO_DEV;
break;
default:
if (req->cmd.xfer)
req->cmd.mode = SCSI_XFER_FROM_DEV;
else {
req->cmd.mode = SCSI_XFER_NONE;
}
break;
}
}
static uint64_t scsi_req_lba(SCSIRequest *req)
{
uint8_t *buf = req->cmd.buf;
uint64_t lba;
switch (buf[0] >> 5) {
case 0:
lba = (uint64_t) buf[3] | ((uint64_t) buf[2] << 8) |
(((uint64_t) buf[1] & 0x1f) << 16);
break;
case 1:
case 2:
lba = (uint64_t) buf[5] | ((uint64_t) buf[4] << 8) |
((uint64_t) buf[3] << 16) | ((uint64_t) buf[2] << 24);
break;
case 4:
lba = (uint64_t) buf[9] | ((uint64_t) buf[8] << 8) |
((uint64_t) buf[7] << 16) | ((uint64_t) buf[6] << 24) |
((uint64_t) buf[5] << 32) | ((uint64_t) buf[4] << 40) |
((uint64_t) buf[3] << 48) | ((uint64_t) buf[2] << 56);
break;
case 5:
lba = (uint64_t) buf[5] | ((uint64_t) buf[4] << 8) |
((uint64_t) buf[3] << 16) | ((uint64_t) buf[2] << 24);
break;
default:
lba = -1;
}
return lba;
}
int scsi_req_parse(SCSIRequest *req, uint8_t *buf)
{
int rc;
if (req->dev->type == TYPE_TAPE) {
rc = scsi_req_stream_length(req, buf);
} else {
rc = scsi_req_length(req, buf);
}
if (rc != 0)
return rc;
memcpy(req->cmd.buf, buf, req->cmd.len);
scsi_req_xfer_mode(req);
req->cmd.lba = scsi_req_lba(req);
trace_scsi_req_parsed(req->dev->id, req->lun, req->tag, buf[0],
req->cmd.mode, req->cmd.xfer);
if (req->cmd.lba != -1) {
trace_scsi_req_parsed_lba(req->dev->id, req->lun, req->tag, buf[0],
req->cmd.lba);
}
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
};
/* 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
};
/* 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
};
/*
* 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] = 0xf0;
buf[2] = sense.key;
buf[7] = 7;
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",
[ SEEK_6 ] = "SEEK_6",
[ 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 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",
[ 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",
[ SYNCHRONIZE_CACHE_16 ] = "SYNCHRONIZE_CACHE_16",
[ LOCATE_16 ] = "LOCATE_16",
[ WRITE_SAME_16 ] = "WRITE_SAME_16",
[ ERASE_16 ] = "ERASE_16",
[ SERVICE_ACTION_IN ] = "SERVICE_ACTION_IN",
[ WRITE_LONG_16 ] = "WRITE_LONG_16",
[ REPORT_LUNS ] = "REPORT_LUNS",
[ BLANK ] = "BLANK",
[ MAINTENANCE_IN ] = "MAINTENANCE_IN",
[ MAINTENANCE_OUT ] = "MAINTENANCE_OUT",
[ MOVE_MEDIUM ] = "MOVE_MEDIUM",
[ LOAD_UNLOAD ] = "LOAD_UNLOAD",
[ READ_12 ] = "READ_12",
[ WRITE_12 ] = "WRITE_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",
[ READ_DEFECT_DATA_12 ] = "READ_DEFECT_DATA_12",
[ SET_CD_SPEED ] = "SET_CD_SPEED",
};
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)
{
if (--req->refcount == 0) {
if (req->dev->info->free_req) {
req->dev->info->free_req(req);
}
qemu_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->dev->info->write_data(req);
} else {
req->dev->info->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)
{
trace_scsi_req_data(req->dev->id, req->lun, req->tag, len);
req->bus->ops->transfer_data(req, len);
}
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;
scsi_req_ref(req);
scsi_req_dequeue(req);
req->bus->ops->complete(req, req->status);
scsi_req_unref(req);
}
void scsi_req_cancel(SCSIRequest *req)
{
if (req->dev && req->dev->info->cancel_io) {
req->dev->info->cancel_io(req);
}
scsi_req_ref(req);
scsi_req_dequeue(req);
if (req->bus->ops->cancel) {
req->bus->ops->cancel(req);
}
scsi_req_unref(req);
}
void scsi_req_abort(SCSIRequest *req, int status)
{
if (req->dev && req->dev->info->cancel_io) {
req->dev->info->cancel_io(req);
}
scsi_req_complete(req, status);
}
void scsi_device_purge_requests(SCSIDevice *sdev)
{
SCSIRequest *req;
while (!QTAILQ_EMPTY(&sdev->requests)) {
req = QTAILQ_FIRST(&sdev->requests);
scsi_req_cancel(req);
}
}
static char *scsibus_get_fw_dev_path(DeviceState *dev)
{
SCSIDevice *d = DO_UPCAST(SCSIDevice, qdev, dev);
SCSIBus *bus = scsi_bus_from_device(d);
char path[100];
int i;
for (i = 0; i < bus->ndev; i++) {
if (bus->devs[i] == d) {
break;
}
}
assert(i != bus->ndev);
snprintf(path, sizeof(path), "%s@%x", qdev_fw_name(dev), i);
return strdup(path);
}
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