static struct request *get_alua_req(struct scsi_device *sdev,
void *buffer, unsigned buflen, int rw)
{
struct request *rq;
struct request_queue *q = sdev->request_queue;
rq = blk_get_request(q, rw, GFP_NOIO);
if (!rq) {
sdev_printk(KERN_INFO, sdev,
"%s: blk_get_request failed\n", __func__);
return NULL;
}
if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) {
blk_put_request(rq);
sdev_printk(KERN_INFO, sdev,
"%s: blk_rq_map_kern failed\n", __func__);
return NULL;
}
rq->cmd_type = REQ_TYPE_BLOCK_PC;
rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
REQ_FAILFAST_DRIVER;
rq->retries = ALUA_FAILOVER_RETRIES;
rq->timeout = ALUA_FAILOVER_TIMEOUT;
return rq;
}
/*
* alua_std_inquiry - Evaluate standard INQUIRY command
* @sdev: device to be checked
*
* Just extract the TPGS setting to find out if ALUA
* is supported.
*/
static int alua_std_inquiry(struct scsi_device *sdev, struct alua_dh_data *h)
{
int err;
err = submit_std_inquiry(sdev, h);
if (err != SCSI_DH_OK)
return err;
/* Check TPGS setting */
h->tpgs = (h->inq[5] >> 4) & 0x3;
switch (h->tpgs) {
case TPGS_MODE_EXPLICIT|TPGS_MODE_IMPLICIT:
sdev_printk(KERN_INFO, sdev,
"%s: supports implicit and explicit TPGS\n",
ALUA_DH_NAME);
break;
case TPGS_MODE_EXPLICIT:
sdev_printk(KERN_INFO, sdev, "%s: supports explicit TPGS\n",
ALUA_DH_NAME);
break;
case TPGS_MODE_IMPLICIT:
sdev_printk(KERN_INFO, sdev, "%s: supports implicit TPGS\n",
ALUA_DH_NAME);
break;
default:
h->tpgs = TPGS_MODE_NONE;
sdev_printk(KERN_INFO, sdev, "%s: not supported\n",
ALUA_DH_NAME);
err = SCSI_DH_DEV_UNSUPP;
break;
}
return err;
}
/*
* alua_check_tpgs - Evaluate TPGS setting
* @sdev: device to be checked
*
* Examine the TPGS setting of the sdev to find out if ALUA
* is supported.
*/
static int alua_check_tpgs(struct scsi_device *sdev, struct alua_dh_data *h)
{
int err = SCSI_DH_OK;
h->tpgs = scsi_device_tpgs(sdev);
switch (h->tpgs) {
case TPGS_MODE_EXPLICIT|TPGS_MODE_IMPLICIT:
sdev_printk(KERN_INFO, sdev,
"%s: supports implicit and explicit TPGS\n",
ALUA_DH_NAME);
break;
case TPGS_MODE_EXPLICIT:
sdev_printk(KERN_INFO, sdev, "%s: supports explicit TPGS\n",
ALUA_DH_NAME);
break;
case TPGS_MODE_IMPLICIT:
sdev_printk(KERN_INFO, sdev, "%s: supports implicit TPGS\n",
ALUA_DH_NAME);
break;
default:
h->tpgs = TPGS_MODE_NONE;
sdev_printk(KERN_INFO, sdev, "%s: not supported\n",
ALUA_DH_NAME);
err = SCSI_DH_DEV_UNSUPP;
break;
}
return err;
}
static int parse_sp_info_reply(struct scsi_device *sdev,
struct clariion_dh_data *csdev)
{
int err = SCSI_DH_OK;
/* check for in-progress ucode upgrade (NDU) */
if (csdev->buffer[48] != 0) {
sdev_printk(KERN_NOTICE, sdev, "%s: Detected in-progress "
"ucode upgrade NDU operation while finding "
"current active SP.", CLARIION_NAME);
err = SCSI_DH_DEV_TEMP_BUSY;
goto out;
}
if (csdev->buffer[4] > 2) {
/* Invalid buffer format */
sdev_printk(KERN_NOTICE, sdev,
"%s: invalid VPD page 0xC0 format\n",
CLARIION_NAME);
err = SCSI_DH_NOSYS;
goto out;
}
switch (csdev->buffer[28] & 0x0f) {
case 6:
sdev_printk(KERN_NOTICE, sdev,
"%s: ALUA failover mode detected\n",
CLARIION_NAME);
break;
case 4:
/* Linux failover */
break;
default:
sdev_printk(KERN_WARNING, sdev,
"%s: Invalid failover mode %d\n",
CLARIION_NAME, csdev->buffer[28] & 0x0f);
err = SCSI_DH_NOSYS;
goto out;
}
csdev->default_sp = csdev->buffer[5];
csdev->lun_state = csdev->buffer[4];
csdev->current_sp = csdev->buffer[8];
csdev->port = csdev->buffer[7];
if (csdev->lun_state == CLARIION_LUN_OWNED)
sdev->access_state = SCSI_ACCESS_STATE_OPTIMAL;
else
sdev->access_state = SCSI_ACCESS_STATE_STANDBY;
if (csdev->default_sp == csdev->current_sp)
sdev->access_state |= SCSI_ACCESS_STATE_PREFERRED;
out:
return err;
}
static int clariion_bus_attach(struct scsi_device *sdev)
{
struct scsi_dh_data *scsi_dh_data;
struct clariion_dh_data *h;
unsigned long flags;
int err;
scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
+ sizeof(*h) , GFP_KERNEL);
if (!scsi_dh_data) {
sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
CLARIION_NAME);
return -ENOMEM;
}
scsi_dh_data->scsi_dh = &clariion_dh;
h = (struct clariion_dh_data *) scsi_dh_data->buf;
h->lun_state = CLARIION_LUN_UNINITIALIZED;
h->default_sp = CLARIION_UNBOUND_LU;
h->current_sp = CLARIION_UNBOUND_LU;
err = clariion_std_inquiry(sdev, h);
if (err != SCSI_DH_OK)
goto failed;
err = clariion_send_inquiry(sdev, h);
if (err != SCSI_DH_OK)
goto failed;
if (!try_module_get(THIS_MODULE))
goto failed;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
sdev->scsi_dh_data = scsi_dh_data;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
sdev_printk(KERN_INFO, sdev,
"%s: connected to SP %c Port %d (%s, default SP %c)\n",
CLARIION_NAME, h->current_sp + 'A',
h->port, lun_state[h->lun_state],
h->default_sp + 'A');
return 0;
failed:
kfree(scsi_dh_data);
sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
CLARIION_NAME);
return -EINVAL;
}
static int parse_sp_info_reply(struct scsi_device *sdev, int result,
int *default_sp, int *current_sp, int *new_current_sp)
{
int err = SCSI_DH_OK;
struct clariion_dh_data *csdev = get_clariion_data(sdev);
if (result == 0) {
/* check for in-progress ucode upgrade (NDU) */
if (csdev->buffer[48] != 0) {
sdev_printk(KERN_NOTICE, sdev, "Detected in-progress "
"ucode upgrade NDU operation while finding "
"current active SP.");
err = SCSI_DH_DEV_TEMP_BUSY;
} else {
*default_sp = csdev->buffer[5];
if (csdev->buffer[4] == 2)
/* SP for path is current */
*current_sp = csdev->buffer[8];
else {
if (csdev->buffer[4] == 1)
/* SP for this path is NOT current */
if (csdev->buffer[8] == 0)
*current_sp = 1;
else
*current_sp = 0;
else
/* unbound LU or LUNZ */
*current_sp = CLARIION_UNBOUND_LU;
}
*new_current_sp = csdev->buffer[8];
}
} else {
struct scsi_sense_hdr sshdr;
err = SCSI_DH_IO;
if (scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
&sshdr))
sdev_printk(KERN_ERR, sdev, "Found valid sense data "
"0x%2x, 0x%2x, 0x%2x while finding current "
"active SP.", sshdr.sense_key, sshdr.asc,
sshdr.ascq);
else
sdev_printk(KERN_ERR, sdev, "Error 0x%x finding "
"current active SP.", result);
}
return err;
}
/*
* alua_stpg - Evaluate SET TARGET GROUP STATES
* @sdev: the device to be evaluated
* @state: the new target group state
*
* Send a SET TARGET GROUP STATES command to the device.
* We only have to test here if we should resubmit the command;
* any other error is assumed as a failure.
*/
static void stpg_endio(struct request *req, int error)
{
struct alua_dh_data *h = req->end_io_data;
struct scsi_sense_hdr sense_hdr;
unsigned err = SCSI_DH_OK;
if (host_byte(req->errors) != DID_OK ||
msg_byte(req->errors) != COMMAND_COMPLETE) {
err = SCSI_DH_IO;
goto done;
}
if (req->sense_len > 0) {
err = scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE,
&sense_hdr);
if (!err) {
err = SCSI_DH_IO;
goto done;
}
err = alua_check_sense(h->sdev, &sense_hdr);
if (err == ADD_TO_MLQUEUE) {
err = SCSI_DH_RETRY;
goto done;
}
sdev_printk(KERN_INFO, h->sdev,
"%s: stpg sense code: %02x/%02x/%02x\n",
ALUA_DH_NAME, sense_hdr.sense_key,
sense_hdr.asc, sense_hdr.ascq);
err = SCSI_DH_IO;
} else if (error)
err = SCSI_DH_IO;
if (err == SCSI_DH_OK) {
h->state = TPGS_STATE_OPTIMIZED;
sdev_printk(KERN_INFO, h->sdev,
"%s: port group %02x switched to state %c\n",
ALUA_DH_NAME, h->group_id,
print_alua_state(h->state));
}
done:
req->end_io_data = NULL;
__blk_put_request(req->q, req);
if (h->callback_fn) {
h->callback_fn(h->callback_data, err);
h->callback_fn = h->callback_data = NULL;
}
return;
}
/*
* submit_vpd_inquiry - Issue an INQUIRY VPD page 0x83 command
* @sdev: sdev the command should be sent to
*/
static int submit_vpd_inquiry(struct scsi_device *sdev, struct alua_dh_data *h)
{
struct request *rq;
int err = SCSI_DH_RES_TEMP_UNAVAIL;
rq = get_alua_req(sdev, h->buff, h->bufflen, READ);
if (!rq)
goto done;
/* Prepare the command. */
rq->cmd[0] = INQUIRY;
rq->cmd[1] = 1;
rq->cmd[2] = 0x83;
rq->cmd[4] = h->bufflen;
rq->cmd_len = COMMAND_SIZE(INQUIRY);
rq->sense = h->sense;
memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
rq->sense_len = h->senselen = 0;
err = blk_execute_rq(rq->q, NULL, rq, 1);
if (err == -EIO) {
sdev_printk(KERN_INFO, sdev,
"%s: evpd inquiry failed with %x\n",
ALUA_DH_NAME, rq->errors);
h->senselen = rq->sense_len;
err = SCSI_DH_IO;
}
blk_put_request(rq);
done:
return err;
}
static void start_stop_endio(struct request *req, int error)
{
struct hp_sw_dh_data *h = req->end_io_data;
unsigned err = SCSI_DH_OK;
if (error || host_byte(req->errors) != DID_OK ||
msg_byte(req->errors) != COMMAND_COMPLETE) {
sdev_printk(KERN_WARNING, h->sdev,
"%s: sending start_stop_unit failed with %x\n",
HP_SW_NAME, req->errors);
err = SCSI_DH_IO;
goto done;
}
if (req->sense_len > 0) {
err = start_done(h->sdev, h->sense);
if (err == SCSI_DH_RETRY) {
err = SCSI_DH_IO;
if (--h->retry_cnt) {
blk_put_request(req);
err = hp_sw_start_stop(h);
if (err == SCSI_DH_OK)
return;
}
}
}
done:
blk_put_request(req);
if (h->callback_fn) {
h->callback_fn(h->callback_data, err);
h->callback_fn = h->callback_data = NULL;
}
return;
}
void scsi_print_command(struct scsi_cmnd *cmd)
{
/* Assume appended output (i.e. not at start of line) */
sdev_printk("", cmd->device, "\n");
printk(KERN_INFO " command: ");
scsi_print_cdb(cmd->cmnd, cmd->cmd_len, 0);
}
/*
* submit_rtpg - Issue a REPORT TARGET GROUP STATES command
* @sdev: sdev the command should be sent to
*/
static unsigned submit_rtpg(struct scsi_device *sdev, struct alua_dh_data *h)
{
struct request *rq;
int err = SCSI_DH_RES_TEMP_UNAVAIL;
rq = get_alua_req(sdev, h->buff, h->bufflen, READ);
if (!rq)
goto done;
/* Prepare the command. */
rq->cmd[0] = MAINTENANCE_IN;
rq->cmd[1] = MI_REPORT_TARGET_PGS;
rq->cmd[6] = (h->bufflen >> 24) & 0xff;
rq->cmd[7] = (h->bufflen >> 16) & 0xff;
rq->cmd[8] = (h->bufflen >> 8) & 0xff;
rq->cmd[9] = h->bufflen & 0xff;
rq->cmd_len = COMMAND_SIZE(MAINTENANCE_IN);
rq->sense = h->sense;
memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
rq->sense_len = h->senselen = 0;
err = blk_execute_rq(rq->q, NULL, rq, 1);
if (err == -EIO) {
sdev_printk(KERN_INFO, sdev,
"%s: rtpg failed with %x\n",
ALUA_DH_NAME, rq->errors);
h->senselen = rq->sense_len;
err = SCSI_DH_IO;
}
blk_put_request(rq);
done:
return err;
}
/*
* tur_done - Handle TEST UNIT READY return status
* @sdev: sdev the command has been sent to
* @errors: blk error code
*
* Returns SCSI_DH_DEV_OFFLINED if the sdev is on the passive path
*/
static int tur_done(struct scsi_device *sdev, struct hp_sw_dh_data *h,
struct scsi_sense_hdr *sshdr)
{
int ret = SCSI_DH_IO;
switch (sshdr->sense_key) {
case UNIT_ATTENTION:
ret = SCSI_DH_IMM_RETRY;
break;
case NOT_READY:
if (sshdr->asc == 0x04 && sshdr->ascq == 2) {
/*
* LUN not ready - Initialization command required
*
* This is the passive path
*/
h->path_state = HP_SW_PATH_PASSIVE;
ret = SCSI_DH_OK;
break;
}
/* Fallthrough */
default:
sdev_printk(KERN_WARNING, sdev,
"%s: sending tur failed, sense %x/%x/%x\n",
HP_SW_NAME, sshdr->sense_key, sshdr->asc,
sshdr->ascq);
break;
}
return ret;
}
/*
* hp_sw_tur - Send TEST UNIT READY
* @sdev: sdev command should be sent to
*
* Use the TEST UNIT READY command to determine
* the path state.
*/
static int hp_sw_tur(struct scsi_device *sdev, struct hp_sw_dh_data *h)
{
unsigned char cmd[6] = { TEST_UNIT_READY };
struct scsi_sense_hdr sshdr;
int ret = SCSI_DH_OK, res;
u64 req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
REQ_FAILFAST_DRIVER;
retry:
res = scsi_execute(sdev, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
HP_SW_TIMEOUT, HP_SW_RETRIES, req_flags, 0, NULL);
if (res) {
if (scsi_sense_valid(&sshdr))
ret = tur_done(sdev, h, &sshdr);
else {
sdev_printk(KERN_WARNING, sdev,
"%s: sending tur failed with %x\n",
HP_SW_NAME, res);
ret = SCSI_DH_IO;
}
} else {
h->path_state = HP_SW_PATH_ACTIVE;
ret = SCSI_DH_OK;
}
if (ret == SCSI_DH_IMM_RETRY)
goto retry;
return ret;
}
static int clariion_bus_attach(struct scsi_device *sdev)
{
struct clariion_dh_data *h;
int err;
h = kzalloc(sizeof(*h) , GFP_KERNEL);
if (!h)
return -ENOMEM;
h->lun_state = CLARIION_LUN_UNINITIALIZED;
h->default_sp = CLARIION_UNBOUND_LU;
h->current_sp = CLARIION_UNBOUND_LU;
err = clariion_std_inquiry(sdev, h);
if (err != SCSI_DH_OK)
goto failed;
err = clariion_send_inquiry(sdev, h);
if (err != SCSI_DH_OK)
goto failed;
sdev_printk(KERN_INFO, sdev,
"%s: connected to SP %c Port %d (%s, default SP %c)\n",
CLARIION_NAME, h->current_sp + 'A',
h->port, lun_state[h->lun_state],
h->default_sp + 'A');
sdev->handler_data = h;
return 0;
failed:
kfree(h);
return -EINVAL;
}
static int clariion_send_inquiry(struct scsi_device *sdev,
struct clariion_dh_data *csdev)
{
int err, retry = CLARIION_RETRIES;
retry:
err = send_inquiry_cmd(sdev, 0xC0, csdev);
if (err != SCSI_DH_OK && csdev->senselen) {
struct scsi_sense_hdr sshdr;
err = scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
&sshdr);
if (!err)
return SCSI_DH_IO;
err = clariion_check_sense(sdev, &sshdr);
if (retry > 0 && err == ADD_TO_MLQUEUE) {
retry--;
goto retry;
}
sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code "
"%02x/%02x/%02x\n", CLARIION_NAME,
sshdr.sense_key, sshdr.asc, sshdr.ascq);
err = SCSI_DH_IO;
} else {
err = parse_sp_info_reply(sdev, csdev);
}
return err;
}
static int hp_sw_bus_attach(struct scsi_device *sdev)
{
struct hp_sw_dh_data *h;
int ret;
h = kzalloc(sizeof(*h), GFP_KERNEL);
if (!h)
return -ENOMEM;
h->path_state = HP_SW_PATH_UNINITIALIZED;
h->retries = HP_SW_RETRIES;
h->sdev = sdev;
ret = hp_sw_tur(sdev, h);
if (ret != SCSI_DH_OK || h->path_state == HP_SW_PATH_UNINITIALIZED)
goto failed;
sdev_printk(KERN_INFO, sdev, "%s: attached to %s path\n",
HP_SW_NAME, h->path_state == HP_SW_PATH_ACTIVE?
"active":"passive");
sdev->handler_data = h;
return 0;
failed:
kfree(h);
return -EINVAL;
}
static int send_inquiry_cmd(struct scsi_device *sdev, int page,
struct clariion_dh_data *csdev)
{
struct request *rq = get_req(sdev, INQUIRY, csdev->buffer);
int err;
if (!rq)
return SCSI_DH_RES_TEMP_UNAVAIL;
rq->sense = csdev->sense;
memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
rq->sense_len = csdev->senselen = 0;
rq->cmd[0] = INQUIRY;
if (page != 0) {
rq->cmd[1] = 1;
rq->cmd[2] = page;
}
err = blk_execute_rq(sdev->request_queue, NULL, rq, 1);
if (err == -EIO) {
sdev_printk(KERN_INFO, sdev,
"%s: failed to send %s INQUIRY: %x\n",
CLARIION_NAME, page?"EVPD":"standard",
rq->errors);
csdev->senselen = rq->sense_len;
err = SCSI_DH_IO;
}
blk_put_request(rq);
return err;
}
/*
* stpg_endio - Evaluate SET TARGET GROUP STATES
* @sdev: the device to be evaluated
* @state: the new target group state
*
* Evaluate a SET TARGET GROUP STATES command response.
*/
static void stpg_endio(struct request *req, int error)
{
struct alua_dh_data *h = req->end_io_data;
struct scsi_sense_hdr sense_hdr;
unsigned err = SCSI_DH_OK;
if (host_byte(req->errors) != DID_OK ||
msg_byte(req->errors) != COMMAND_COMPLETE) {
err = SCSI_DH_IO;
goto done;
}
if (scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE,
&sense_hdr)) {
if (sense_hdr.sense_key == NOT_READY &&
sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x0a) {
/* ALUA state transition already in progress */
err = SCSI_DH_OK;
goto done;
}
if (sense_hdr.sense_key == UNIT_ATTENTION) {
err = SCSI_DH_RETRY;
goto done;
}
sdev_printk(KERN_INFO, h->sdev, "%s: stpg failed\n",
ALUA_DH_NAME);
scsi_print_sense_hdr(h->sdev, ALUA_DH_NAME, &sense_hdr);
err = SCSI_DH_IO;
} else if (error)
err = SCSI_DH_IO;
if (err == SCSI_DH_OK) {
h->state = TPGS_STATE_OPTIMIZED;
sdev_printk(KERN_INFO, h->sdev,
"%s: port group %02x switched to state %c\n",
ALUA_DH_NAME, h->group_id,
print_alua_state(h->state));
}
done:
req->end_io_data = NULL;
__blk_put_request(req->q, req);
if (h->callback_fn) {
h->callback_fn(h->callback_data, err);
h->callback_fn = h->callback_data = NULL;
}
return;
}
static char * parse_sp_model(struct scsi_device *sdev, unsigned char *buffer)
{
unsigned char len = buffer[4] + 5;
char *sp_model = NULL;
unsigned char sp_len, serial_len;
if (len < 160) {
sdev_printk(KERN_WARNING, sdev,
"%s: Invalid information section length %d\n",
CLARIION_NAME, len);
/* Check for old FC arrays */
if (!strncmp(buffer + 8, "DGC", 3)) {
/* Old FC array, not supporting extended information */
sp_model = emc_default_str;
}
goto out;
}
/*
* Parse extended information for SP model number
*/
serial_len = buffer[160];
if (serial_len == 0 || serial_len + 161 > len) {
sdev_printk(KERN_WARNING, sdev,
"%s: Invalid array serial number length %d\n",
CLARIION_NAME, serial_len);
goto out;
}
sp_len = buffer[99];
if (sp_len == 0 || serial_len + sp_len + 161 > len) {
sdev_printk(KERN_WARNING, sdev,
"%s: Invalid model number length %d\n",
CLARIION_NAME, sp_len);
goto out;
}
sp_model = &buffer[serial_len + 161];
/* Strip whitespace at the end */
while (sp_len > 1 && sp_model[sp_len - 1] == ' ')
sp_len--;
sp_model[sp_len] = '\0';
out:
return sp_model;
}
/*
* alua_bus_attach - Attach device handler
* @sdev: device to be attached to
*/
static int alua_bus_attach(struct scsi_device *sdev)
{
struct scsi_dh_data *scsi_dh_data;
struct alua_dh_data *h;
unsigned long flags;
int err = SCSI_DH_OK;
scsi_dh_data = kzalloc(sizeof(*scsi_dh_data)
+ sizeof(*h) , GFP_KERNEL);
if (!scsi_dh_data) {
sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
ALUA_DH_NAME);
return -ENOMEM;
}
scsi_dh_data->scsi_dh = &alua_dh;
h = (struct alua_dh_data *) scsi_dh_data->buf;
h->tpgs = TPGS_MODE_UNINITIALIZED;
h->state = TPGS_STATE_OPTIMIZED;
h->group_id = -1;
h->rel_port = -1;
h->buff = h->inq;
h->bufflen = ALUA_INQUIRY_SIZE;
h->sdev = sdev;
err = alua_initialize(sdev, h);
if ((err != SCSI_DH_OK) && (err != SCSI_DH_DEV_OFFLINED))
goto failed;
if (!try_module_get(THIS_MODULE))
goto failed;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
sdev->scsi_dh_data = scsi_dh_data;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
sdev_printk(KERN_NOTICE, sdev, "%s: Attached\n", ALUA_DH_NAME);
return 0;
failed:
kfree(scsi_dh_data);
sdev_printk(KERN_ERR, sdev, "%s: not attached\n", ALUA_DH_NAME);
return -EINVAL;
}
/*
* Parse MODE_SELECT cmd reply.
*/
static int trespass_endio(struct scsi_device *sdev, int result)
{
int err = SCSI_DH_OK;
struct scsi_sense_hdr sshdr;
struct clariion_dh_data *csdev = get_clariion_data(sdev);
char *sense = csdev->sense;
if (status_byte(result) == CHECK_CONDITION &&
scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)) {
sdev_printk(KERN_ERR, sdev, "Found valid sense data 0x%2x, "
"0x%2x, 0x%2x while sending CLARiiON trespass "
"command.\n", sshdr.sense_key, sshdr.asc,
sshdr.ascq);
if ((sshdr.sense_key == 0x05) && (sshdr.asc == 0x04) &&
(sshdr.ascq == 0x00)) {
/*
* Array based copy in progress -- do not send
* mode_select or copy will be aborted mid-stream.
*/
sdev_printk(KERN_INFO, sdev, "Array Based Copy in "
"progress while sending CLARiiON trespass "
"command.\n");
err = SCSI_DH_DEV_TEMP_BUSY;
} else if ((sshdr.sense_key == 0x02) && (sshdr.asc == 0x04) &&
(sshdr.ascq == 0x03)) {
/*
* LUN Not Ready - Manual Intervention Required
* indicates in-progress ucode upgrade (NDU).
*/
sdev_printk(KERN_INFO, sdev, "Detected in-progress "
"ucode upgrade NDU operation while sending "
"CLARiiON trespass command.\n");
err = SCSI_DH_DEV_TEMP_BUSY;
} else
err = SCSI_DH_DEV_FAILED;
} else if (result) {
sdev_printk(KERN_ERR, sdev, "Error 0x%x while sending "
"CLARiiON trespass command.\n", result);
err = SCSI_DH_IO;
}
return err;
}
/*
* hp_sw_start_stop - Send START STOP UNIT command
* @sdev: sdev command should be sent to
*
* Sending START STOP UNIT activates the SP.
*/
static int hp_sw_start_stop(struct hp_sw_dh_data *h)
{
unsigned char cmd[6] = { START_STOP, 0, 0, 0, 1, 0 };
struct scsi_sense_hdr sshdr;
struct scsi_device *sdev = h->sdev;
int res, rc = SCSI_DH_OK;
int retry_cnt = HP_SW_RETRIES;
u64 req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
REQ_FAILFAST_DRIVER;
retry:
res = scsi_execute(sdev, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
HP_SW_TIMEOUT, HP_SW_RETRIES, req_flags, 0, NULL);
if (res) {
if (!scsi_sense_valid(&sshdr)) {
sdev_printk(KERN_WARNING, sdev,
"%s: sending start_stop_unit failed, "
"no sense available\n", HP_SW_NAME);
return SCSI_DH_IO;
}
switch (sshdr.sense_key) {
case NOT_READY:
if (sshdr.asc == 0x04 && sshdr.ascq == 3) {
/*
* LUN not ready - manual intervention required
*
* Switch-over in progress, retry.
*/
if (--retry_cnt)
goto retry;
rc = SCSI_DH_RETRY;
break;
}
/* fall through */
default:
sdev_printk(KERN_WARNING, sdev,
"%s: sending start_stop_unit failed, "
"sense %x/%x/%x\n", HP_SW_NAME,
sshdr.sense_key, sshdr.asc, sshdr.ascq);
rc = SCSI_DH_IO;
}
}
return rc;
}
static int hp_sw_bus_attach(struct scsi_device *sdev)
{
struct scsi_dh_data *scsi_dh_data;
struct hp_sw_dh_data *h;
unsigned long flags;
int ret;
scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
+ sizeof(struct hp_sw_dh_data) , GFP_KERNEL);
if (!scsi_dh_data) {
sdev_printk(KERN_ERR, sdev, "%s: Attach Failed\n",
HP_SW_NAME);
return 0;
}
scsi_dh_data->scsi_dh = &hp_sw_dh;
h = (struct hp_sw_dh_data *) scsi_dh_data->buf;
h->path_state = HP_SW_PATH_UNINITIALIZED;
h->retries = HP_SW_RETRIES;
h->sdev = sdev;
ret = hp_sw_tur(sdev, h);
if (ret != SCSI_DH_OK || h->path_state == HP_SW_PATH_UNINITIALIZED)
goto failed;
if (!try_module_get(THIS_MODULE))
goto failed;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
sdev->scsi_dh_data = scsi_dh_data;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
sdev_printk(KERN_INFO, sdev, "%s: attached to %s path\n",
HP_SW_NAME, h->path_state == HP_SW_PATH_ACTIVE?
"active":"passive");
return 0;
failed:
kfree(scsi_dh_data);
sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
HP_SW_NAME);
return -EINVAL;
}
/*
* Parse MODE_SELECT cmd reply.
*/
static int trespass_endio(struct scsi_device *sdev, char *sense)
{
int err = SCSI_DH_IO;
struct scsi_sense_hdr sshdr;
if (!scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)) {
sdev_printk(KERN_ERR, sdev, "%s: Found valid sense data 0x%2x, "
"0x%2x, 0x%2x while sending CLARiiON trespass "
"command.\n", CLARIION_NAME, sshdr.sense_key,
sshdr.asc, sshdr.ascq);
if ((sshdr.sense_key == 0x05) && (sshdr.asc == 0x04) &&
(sshdr.ascq == 0x00)) {
/*
* Array based copy in progress -- do not send
* mode_select or copy will be aborted mid-stream.
*/
sdev_printk(KERN_INFO, sdev, "%s: Array Based Copy in "
"progress while sending CLARiiON trespass "
"command.\n", CLARIION_NAME);
err = SCSI_DH_DEV_TEMP_BUSY;
} else if ((sshdr.sense_key == 0x02) && (sshdr.asc == 0x04) &&
(sshdr.ascq == 0x03)) {
/*
* LUN Not Ready - Manual Intervention Required
* indicates in-progress ucode upgrade (NDU).
*/
sdev_printk(KERN_INFO, sdev, "%s: Detected in-progress "
"ucode upgrade NDU operation while sending "
"CLARiiON trespass command.\n", CLARIION_NAME);
err = SCSI_DH_DEV_TEMP_BUSY;
} else
err = SCSI_DH_DEV_FAILED;
} else {
sdev_printk(KERN_INFO, sdev,
"%s: failed to send MODE SELECT, no sense available\n",
CLARIION_NAME);
}
return err;
}
/*
* tur_done - Handle TEST UNIT READY return status
* @sdev: sdev the command has been sent to
* @errors: blk error code
*
* Returns SCSI_DH_DEV_OFFLINED if the sdev is on the passive path
*/
static int tur_done(struct scsi_device *sdev, unsigned char *sense)
{
struct scsi_sense_hdr sshdr;
int ret;
ret = scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr);
if (!ret) {
sdev_printk(KERN_WARNING, sdev,
"%s: sending tur failed, no sense available\n",
HP_SW_NAME);
ret = SCSI_DH_IO;
goto done;
}
switch (sshdr.sense_key) {
case UNIT_ATTENTION:
ret = SCSI_DH_IMM_RETRY;
break;
case NOT_READY:
if ((sshdr.asc == 0x04) && (sshdr.ascq == 2)) {
/*
* LUN not ready - Initialization command required
*
* This is the passive path
*/
ret = SCSI_DH_DEV_OFFLINED;
break;
}
/* Fallthrough */
default:
sdev_printk(KERN_WARNING, sdev,
"%s: sending tur failed, sense %x/%x/%x\n",
HP_SW_NAME, sshdr.sense_key, sshdr.asc,
sshdr.ascq);
break;
}
done:
return ret;
}
static int clariion_std_inquiry(struct scsi_device *sdev,
struct clariion_dh_data *csdev)
{
int err;
char *sp_model;
err = send_inquiry_cmd(sdev, 0, csdev);
if (err != SCSI_DH_OK && csdev->senselen) {
struct scsi_sense_hdr sshdr;
if (scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
&sshdr)) {
sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code "
"%02x/%02x/%02x\n", CLARIION_NAME,
sshdr.sense_key, sshdr.asc, sshdr.ascq);
}
err = SCSI_DH_IO;
goto out;
}
sp_model = parse_sp_model(sdev, csdev->buffer);
if (!sp_model) {
err = SCSI_DH_DEV_UNSUPP;
goto out;
}
/*
* FC Series arrays do not support long trespass
*/
if (!strlen(sp_model) || !strncmp(sp_model, "FC",2))
csdev->flags |= CLARIION_SHORT_TRESPASS;
sdev_printk(KERN_INFO, sdev,
"%s: detected Clariion %s, flags %x\n",
CLARIION_NAME, sp_model, csdev->flags);
out:
return err;
}
/*
* Get block request for REQ_BLOCK_PC command issued to path. Currently
* limited to MODE_SELECT (trespass) and INQUIRY (VPD page 0xC0) commands.
*
* Uses data and sense buffers in hardware handler context structure and
* assumes serial servicing of commands, both issuance and completion.
*/
static struct request *get_req(struct scsi_device *sdev, int cmd,
unsigned char *buffer)
{
struct request *rq;
int len = 0;
rq = blk_get_request(sdev->request_queue,
(cmd != INQUIRY) ? WRITE : READ, GFP_NOIO);
if (IS_ERR(rq)) {
sdev_printk(KERN_INFO, sdev, "get_req: blk_get_request failed");
return NULL;
}
blk_rq_set_block_pc(rq);
rq->cmd_len = COMMAND_SIZE(cmd);
rq->cmd[0] = cmd;
switch (cmd) {
case MODE_SELECT:
len = sizeof(short_trespass);
rq->cmd[1] = 0x10;
rq->cmd[4] = len;
break;
case MODE_SELECT_10:
len = sizeof(long_trespass);
rq->cmd[1] = 0x10;
rq->cmd[8] = len;
break;
case INQUIRY:
len = CLARIION_BUFFER_SIZE;
rq->cmd[4] = len;
memset(buffer, 0, len);
break;
default:
BUG_ON(1);
break;
}
rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
REQ_FAILFAST_DRIVER;
rq->timeout = CLARIION_TIMEOUT;
rq->retries = CLARIION_RETRIES;
if (blk_rq_map_kern(rq->q, rq, buffer, len, GFP_NOIO)) {
blk_put_request(rq);
return NULL;
}
return rq;
}
static void hp_sw_bus_detach( struct scsi_device *sdev )
{
struct scsi_dh_data *scsi_dh_data;
unsigned long flags;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
scsi_dh_data = sdev->scsi_dh_data;
sdev->scsi_dh_data = NULL;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
module_put(THIS_MODULE);
sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", HP_SW_NAME);
kfree(scsi_dh_data);
}
static int clariion_activate(struct scsi_device *sdev,
activate_complete fn, void *data)
{
struct clariion_dh_data *csdev = sdev->handler_data;
int result;
result = clariion_send_inquiry(sdev, csdev);
if (result != SCSI_DH_OK)
goto done;
if (csdev->lun_state == CLARIION_LUN_OWNED)
goto done;
result = send_trespass_cmd(sdev, csdev);
if (result != SCSI_DH_OK)
goto done;
sdev_printk(KERN_INFO, sdev,"%s: %s trespass command sent\n",
CLARIION_NAME,
csdev->flags&CLARIION_SHORT_TRESPASS?"short":"long" );
/* Update status */
result = clariion_send_inquiry(sdev, csdev);
if (result != SCSI_DH_OK)
goto done;
done:
sdev_printk(KERN_INFO, sdev,
"%s: at SP %c Port %d (%s, default SP %c)\n",
CLARIION_NAME, csdev->current_sp + 'A',
csdev->port, lun_state[csdev->lun_state],
csdev->default_sp + 'A');
if (fn)
fn(data, result);
return 0;
}
static int send_trespass_cmd(struct scsi_device *sdev,
struct clariion_dh_data *csdev)
{
struct request *rq;
unsigned char *page22;
int err, len, cmd;
if (csdev->flags & CLARIION_SHORT_TRESPASS) {
page22 = short_trespass;
if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
/* Set Honor Reservations bit */
page22[6] |= 0x80;
len = sizeof(short_trespass);
cmd = MODE_SELECT;
} else {
page22 = long_trespass;
if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
/* Set Honor Reservations bit */
page22[10] |= 0x80;
len = sizeof(long_trespass);
cmd = MODE_SELECT_10;
}
BUG_ON((len > CLARIION_BUFFER_SIZE));
memcpy(csdev->buffer, page22, len);
rq = get_req(sdev, cmd, csdev->buffer);
if (!rq)
return SCSI_DH_RES_TEMP_UNAVAIL;
rq->sense = csdev->sense;
memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
rq->sense_len = csdev->senselen = 0;
err = blk_execute_rq(sdev->request_queue, NULL, rq, 1);
if (err == -EIO) {
if (rq->sense_len) {
err = trespass_endio(sdev, csdev->sense);
} else {
sdev_printk(KERN_INFO, sdev,
"%s: failed to send MODE SELECT: %x\n",
CLARIION_NAME, rq->errors);
}
}
blk_put_request(rq);
return err;
}
