/*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
* The full GNU General Public License is included in this distribution
* in the file called LICENSE.GPL.
*
* BSD LICENSE
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <scsi/sas.h>
#include <linux/bitops.h>
#include "isci.h"
#include "port.h"
#include "remote_device.h"
#include "request.h"
#include "remote_node_context.h"
#include "scu_event_codes.h"
#include "task.h"
/**
* isci_remote_device_not_ready() - This function is called by the ihost when
* the remote device is not ready. We mark the isci device as ready (not
* "ready_for_io") and signal the waiting proccess.
* @isci_host: This parameter specifies the isci host object.
* @isci_device: This parameter specifies the remote device
*
* sci_lock is held on entrance to this function.
*/
static void isci_remote_device_not_ready(struct isci_host *ihost,
struct isci_remote_device *idev, u32 reason)
{
struct isci_request *ireq;
dev_dbg(&ihost->pdev->dev,
"%s: isci_device = %p\n", __func__, idev);
switch (reason) {
case SCIC_REMOTE_DEVICE_NOT_READY_STOP_REQUESTED:
set_bit(IDEV_GONE, &idev->flags);
break;
case SCIC_REMOTE_DEVICE_NOT_READY_SATA_SDB_ERROR_FIS_RECEIVED:
set_bit(IDEV_IO_NCQERROR, &idev->flags);
/* Kill all outstanding requests for the device. */
list_for_each_entry(ireq, &idev->reqs_in_process, dev_node) {
dev_dbg(&ihost->pdev->dev,
"%s: isci_device = %p request = %p\n",
__func__, idev, ireq);
sci_controller_terminate_request(ihost,
idev,
ireq);
}
/* Fall through into the default case... */
default:
clear_bit(IDEV_IO_READY, &idev->flags);
break;
}
}
/**
* isci_remote_device_ready() - This function is called by the ihost when the
* remote device is ready. We mark the isci device as ready and signal the
* waiting proccess.
* @ihost: our valid isci_host
* @idev: remote device
*
*/
static void isci_remote_device_ready(struct isci_host *ihost, struct isci_remote_device *idev)
{
dev_dbg(&ihost->pdev->dev,
"%s: idev = %p\n", __func__, idev);
clear_bit(IDEV_IO_NCQERROR, &idev->flags);
set_bit(IDEV_IO_READY, &idev->flags);
if (test_and_clear_bit(IDEV_START_PENDING, &idev->flags))
wake_up(&ihost->eventq);
}
/* called once the remote node context is ready to be freed.
* The remote device can now report that its stop operation is complete. none
*/
static void rnc_destruct_done(void *_dev)
{
struct isci_remote_device *idev = _dev;
BUG_ON(idev->started_request_count != 0);
sci_change_state(&idev->sm, SCI_DEV_STOPPED);
}
static enum sci_status sci_remote_device_terminate_requests(struct isci_remote_device *idev)
{
struct isci_host *ihost = idev->owning_port->owning_controller;
enum sci_status status = SCI_SUCCESS;
u32 i;
for (i = 0; i < SCI_MAX_IO_REQUESTS; i++) {
struct isci_request *ireq = ihost->reqs[i];
enum sci_status s;
if (!test_bit(IREQ_ACTIVE, &ireq->flags) ||
ireq->target_device != idev)
continue;
s = sci_controller_terminate_request(ihost, idev, ireq);
if (s != SCI_SUCCESS)
status = s;
}
return status;
}
enum sci_status sci_remote_device_stop(struct isci_remote_device *idev,
u32 timeout)
{
struct sci_base_state_machine *sm = &idev->sm;
enum sci_remote_device_states state = sm->current_state_id;
switch (state) {
case SCI_DEV_INITIAL:
case SCI_DEV_FAILED:
case SCI_DEV_FINAL:
default:
dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
__func__, state);
return SCI_FAILURE_INVALID_STATE;
case SCI_DEV_STOPPED:
return SCI_SUCCESS;
case SCI_DEV_STARTING:
/* device not started so there had better be no requests */
BUG_ON(idev->started_request_count != 0);
sci_remote_node_context_destruct(&idev->rnc,
rnc_destruct_done, idev);
/* Transition to the stopping state and wait for the
* remote node to complete being posted and invalidated.
*/
sci_change_state(sm, SCI_DEV_STOPPING);
return SCI_SUCCESS;
case SCI_DEV_READY:
case SCI_STP_DEV_IDLE:
case SCI_STP_DEV_CMD:
case SCI_STP_DEV_NCQ:
case SCI_STP_DEV_NCQ_ERROR:
case SCI_STP_DEV_AWAIT_RESET:
case SCI_SMP_DEV_IDLE:
case SCI_SMP_DEV_CMD:
sci_change_state(sm, SCI_DEV_STOPPING);
if (idev->started_request_count == 0) {
sci_remote_node_context_destruct(&idev->rnc,
rnc_destruct_done, idev);
return SCI_SUCCESS;
} else
return sci_remote_device_terminate_requests(idev);
break;
case SCI_DEV_STOPPING:
/* All requests should have been terminated, but if there is an
* attempt to stop a device already in the stopping state, then
* try again to terminate.
*/
return sci_remote_device_terminate_requests(idev);
case SCI_DEV_RESETTING:
sci_change_state(sm, SCI_DEV_STOPPING);
return SCI_SUCCESS;
}
}
enum sci_status sci_remote_device_reset(struct isci_remote_device *idev)
{
struct sci_base_state_machine *sm = &idev->sm;
enum sci_remote_device_states state = sm->current_state_id;
switch (state) {
case SCI_DEV_INITIAL:
case SCI_DEV_STOPPED:
case SCI_DEV_STARTING:
case SCI_SMP_DEV_IDLE:
case SCI_SMP_DEV_CMD:
case SCI_DEV_STOPPING:
case SCI_DEV_FAILED:
case SCI_DEV_RESETTING:
case SCI_DEV_FINAL:
default:
dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
__func__, state);
return SCI_FAILURE_INVALID_STATE;
case SCI_DEV_READY:
case SCI_STP_DEV_IDLE:
case SCI_STP_DEV_CMD:
case SCI_STP_DEV_NCQ:
case SCI_STP_DEV_NCQ_ERROR:
case SCI_STP_DEV_AWAIT_RESET:
sci_change_state(sm, SCI_DEV_RESETTING);
return SCI_SUCCESS;
}
}
enum sci_status sci_remote_device_reset_complete(struct isci_remote_device *idev)
{
struct sci_base_state_machine *sm = &idev->sm;
enum sci_remote_device_states state = sm->current_state_id;
if (state != SCI_DEV_RESETTING) {
dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
__func__, state);
return SCI_FAILURE_INVALID_STATE;
}
sci_change_state(sm, SCI_DEV_READY);
return SCI_SUCCESS;
}
enum sci_status sci_remote_device_suspend(struct isci_remote_device *idev,
u32 suspend_type)
{
struct sci_base_state_machine *sm = &idev->sm;
enum sci_remote_device_states state = sm->current_state_id;
if (state != SCI_STP_DEV_CMD) {
dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
__func__, state);
return SCI_FAILURE_INVALID_STATE;
}
return sci_remote_node_context_suspend(&idev->rnc,
suspend_type, NULL, NULL);
}
enum sci_status sci_remote_device_frame_handler(struct isci_remote_device *idev,
u32 frame_index)
{
struct sci_base_state_machine *sm = &idev->sm;
enum sci_remote_device_states state = sm->current_state_id;
struct isci_host *ihost = idev->owning_port->owning_controller;
enum sci_status status;
switch (state) {
case SCI_DEV_INITIAL:
case SCI_DEV_STOPPED:
case SCI_DEV_STARTING:
case SCI_STP_DEV_IDLE:
case SCI_SMP_DEV_IDLE:
case SCI_DEV_FINAL:
default:
dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
__func__, state);
/* Return the frame back to the controller */
sci_controller_release_frame(ihost, frame_index);
return SCI_FAILURE_INVALID_STATE;
case SCI_DEV_READY:
case SCI_STP_DEV_NCQ_ERROR:
case SCI_STP_DEV_AWAIT_RESET:
case SCI_DEV_STOPPING:
case SCI_DEV_FAILED:
case SCI_DEV_RESETTING: {
struct isci_request *ireq;
struct ssp_frame_hdr hdr;
void *frame_header;
ssize_t word_cnt;
status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
frame_index,
&frame_header);
if (status != SCI_SUCCESS)
return status;
word_cnt = sizeof(hdr) / sizeof(u32);
sci_swab32_cpy(&hdr, frame_header, word_cnt);
ireq = sci_request_by_tag(ihost, be16_to_cpu(hdr.tag));
if (ireq && ireq->target_device == idev) {
/* The IO request is now in charge of releasing the frame */
status = sci_io_request_frame_handler(ireq, frame_index);
} else {
/* We could not map this tag to a valid IO
* request Just toss the frame and continue
*/
sci_controller_release_frame(ihost, frame_index);
}
break;
}
case SCI_STP_DEV_NCQ: {
struct dev_to_host_fis *hdr;
status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
frame_index,
(void **)&hdr);
if (status != SCI_SUCCESS)
return status;
if (hdr->fis_type == FIS_SETDEVBITS &&
(hdr->status & ATA_ERR)) {
idev->not_ready_reason = SCIC_REMOTE_DEVICE_NOT_READY_SATA_SDB_ERROR_FIS_RECEIVED;
/* TODO Check sactive and complete associated IO if any. */
sci_change_state(sm, SCI_STP_DEV_NCQ_ERROR);
} else if (hdr->fis_type == FIS_REGD2H &&
(hdr->status & ATA_ERR)) {
/*
* Some devices return D2H FIS when an NCQ error is detected.
* Treat this like an SDB error FIS ready reason.
*/
idev->not_ready_reason = SCIC_REMOTE_DEVICE_NOT_READY_SATA_SDB_ERROR_FIS_RECEIVED;
sci_change_state(&idev->sm, SCI_STP_DEV_NCQ_ERROR);
} else
status = SCI_FAILURE;
sci_controller_release_frame(ihost, frame_index);
break;
}
case SCI_STP_DEV_CMD:
case SCI_SMP_DEV_CMD:
/* The device does not process any UF received from the hardware while
* in this state. All unsolicited frames are forwarded to the io request
* object.
*/
status = sci_io_request_frame_handler(idev->working_request, frame_index);
break;
}
return status;
}
static bool is_remote_device_ready(struct isci_remote_device *idev)
{
struct sci_base_state_machine *sm = &idev->sm;
enum sci_remote_device_states state = sm->current_state_id;
switch (state) {
case SCI_DEV_READY:
case SCI_STP_DEV_IDLE:
case SCI_STP_DEV_CMD:
case SCI_STP_DEV_NCQ:
case SCI_STP_DEV_NCQ_ERROR:
case SCI_STP_DEV_AWAIT_RESET:
case SCI_SMP_DEV_IDLE:
case SCI_SMP_DEV_CMD:
return true;
default:
return false;
}
}
/*
* called once the remote node context has transisitioned to a ready
* state (after suspending RX and/or TX due to early D2H fis)
*/
static void atapi_remote_device_resume_done(void *_dev)
{
struct isci_remote_device *idev = _dev;
struct isci_request *ireq = idev->working_request;
sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
}
enum sci_status sci_remote_device_event_handler(struct isci_remote_device *idev,
u32 event_code)
{
struct sci_base_state_machine *sm = &idev->sm;
enum sci_remote_device_states state = sm->current_state_id;
enum sci_status status;
switch (scu_get_event_type(event_code)) {
case SCU_EVENT_TYPE_RNC_OPS_MISC:
case SCU_EVENT_TYPE_RNC_SUSPEND_TX:
case SCU_EVENT_TYPE_RNC_SUSPEND_TX_RX:
status = sci_remote_node_context_event_handler(&idev->rnc, event_code);
break;
case SCU_EVENT_TYPE_PTX_SCHEDULE_EVENT:
if (scu_get_event_code(event_code) == SCU_EVENT_IT_NEXUS_TIMEOUT) {
status = SCI_SUCCESS;
/* Suspend the associated RNC */
sci_remote_node_context_suspend(&idev->rnc,
SCI_SOFTWARE_SUSPENSION,
NULL, NULL);
dev_dbg(scirdev_to_dev(idev),
"%s: device: %p event code: %x: %s\n",
__func__, idev, event_code,
is_remote_device_ready(idev)
? "I_T_Nexus_Timeout event"
: "I_T_Nexus_Timeout event in wrong state");
break;
}
/* Else, fall through and treat as unhandled... */
default:
dev_dbg(scirdev_to_dev(idev),
"%s: device: %p event code: %x: %s\n",
__func__, idev, event_code,
is_remote_device_ready(idev)
? "unexpected event"
: "unexpected event in wrong state");
status = SCI_FAILURE_INVALID_STATE;
break;
}
if (status != SCI_SUCCESS)
return status;
if (state == SCI_STP_DEV_ATAPI_ERROR) {
/* For ATAPI error state resume the RNC right away. */
if (scu_get_event_type(event_code) == SCU_EVENT_TYPE_RNC_SUSPEND_TX ||
scu_get_event_type(event_code) == SCU_EVENT_TYPE_RNC_SUSPEND_TX_RX) {
return sci_remote_node_context_resume(&idev->rnc,
atapi_remote_device_resume_done,
idev);
}
}
if (state == SCI_STP_DEV_IDLE) {
/* We pick up suspension events to handle specifically to this
* state. We resume the RNC right away.
*/
if (scu_get_event_type(event_code) == SCU_EVENT_TYPE_RNC_SUSPEND_TX ||
scu_get_event_type(event_code) == SCU_EVENT_TYPE_RNC_SUSPEND_TX_RX)
status = sci_remote_node_context_resume(&idev->rnc, NULL, NULL);
}
return status;
}
static void sci_remote_device_start_request(struct isci_remote_device *idev,
struct isci_request *ireq,
enum sci_status status)
{
struct isci_port *iport = idev->owning_port;
/* cleanup requests that failed after starting on the port */
if (status != SCI_SUCCESS)
sci_port_complete_io(iport, idev, ireq);
else {
kref_get(&idev->kref);
idev->started_request_count++;
}
}
enum sci_status sci_remote_device_start_io(struct isci_host *ihost,
struct isci_remote_device *idev,
struct isci_request *ireq)
{
struct sci_base_state_machine *sm = &idev->sm;
enum sci_remote_device_states state = sm->current_state_id;
struct isci_port *iport = idev->owning_port;
enum sci_status status;
switch (state) {
case SCI_DEV_INITIAL:
case SCI_DEV_STOPPED:
case SCI_DEV_STARTING:
case SCI_STP_DEV_NCQ_ERROR:
case SCI_DEV_STOPPING:
case SCI_DEV_FAILED:
case SCI_DEV_RESETTING:
case SCI_DEV_FINAL:
default:
dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
__func__, state);
return SCI_FAILURE_INVALID_STATE;
case SCI_DEV_READY:
/* attempt to start an io request for this device object. The remote
* device object will issue the start request for the io and if
* successful it will start the request for the port object then
* increment its own request count.
*/
status = sci_port_start_io(iport, idev, ireq);
if (status != SCI_SUCCESS)
return status;
status = sci_remote_node_context_start_io(&idev->rnc, ireq);
if (status != SCI_SUCCESS)
break;
status = sci_request_start(ireq);
break;
case SCI_STP_DEV_IDLE: {
/* handle the start io operation for a sata device that is in
* the command idle state. - Evalute the type of IO request to
* be started - If its an NCQ request change to NCQ substate -
* If its any other command change to the CMD substate
*
* If this is a softreset we may want to have a different
* substate.
*/
enum sci_remote_device_states new_state;
struct sas_task *task = isci_request_access_task(ireq);
status = sci_port_start_io(iport, idev, ireq);
if (status != SCI_SUCCESS)
return status;
status = sci_remote_node_context_start_io(&idev->rnc, ireq);
if (status != SCI_SUCCESS)
break;
status = sci_request_start(ireq);
if (status != SCI_SUCCESS)
break;
if (task->ata_task.use_ncq)
new_state = SCI_STP_DEV_NCQ;
else {
idev->working_request = ireq;
new_state = SCI_STP_DEV_CMD;
}
sci_change_state(sm, new_state);
break;
}
case SCI_STP_DEV_NCQ: {
struct sas_task *task = isci_request_access_task(ireq);
if (task->ata_task.use_ncq) {
status = sci_port_start_io(iport, idev, ireq);
if (status != SCI_SUCCESS)
return status;
status = sci_remote_node_context_start_io(&idev->rnc, ireq);
if (status != SCI_SUCCESS)
break;
status = sci_request_start(ireq);
} else
return SCI_FAILURE_INVALID_STATE;
break;
}
case SCI_STP_DEV_AWAIT_RESET:
return SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED;
case SCI_SMP_DEV_IDLE:
status = sci_port_start_io(iport, idev, ireq);
if (status != SCI_SUCCESS)
return status;
status = sci_remote_node_context_start_io(&idev->rnc, ireq);
if (status != SCI_SUCCESS)
break;
status = sci_request_start(ireq);
if (status != SCI_SUCCESS)
break;
idev->working_request = ireq;
sci_change_state(&idev->sm, SCI_SMP_DEV_CMD);
break;
case SCI_STP_DEV_CMD:
case SCI_SMP_DEV_CMD:
/* device is already handling a command it can not accept new commands
* until this one is complete.
*/
return SCI_FAILURE_INVALID_STATE;
}
sci_remote_device_start_request(idev, ireq, status);
return status;
}
static enum sci_status common_complete_io(struct isci_port *iport,
struct isci_remote_device *idev,
struct isci_request *ireq)
{
enum sci_status status;
status = sci_request_complete(ireq);
if (status != SCI_SUCCESS)
return status;
status = sci_port_complete_io(iport, idev, ireq);
if (status != SCI_SUCCESS)
return status;
sci_remote_device_decrement_request_count(idev);
return status;
}
enum sci_status sci_remote_device_complete_io(struct isci_host *ihost,
struct isci_remote_device *idev,
struct isci_request *ireq)
{
struct sci_base_state_machine *sm = &idev->sm;
enum sci_remote_device_states state = sm->current_state_id;
struct isci_port *iport = idev->owning_port;
enum sci_status status;
switch (state) {
case SCI_DEV_INITIAL:
case SCI_DEV_STOPPED:
case SCI_DEV_STARTING:
case SCI_STP_DEV_IDLE:
case SCI_SMP_DEV_IDLE:
case SCI_DEV_FAILED:
case SCI_DEV_FINAL:
default:
dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
__func__, state);
return SCI_FAILURE_INVALID_STATE;
case SCI_DEV_READY:
case SCI_STP_DEV_AWAIT_RESET:
case SCI_DEV_RESETTING:
status = common_complete_io(iport, idev, ireq);
break;
case SCI_STP_DEV_CMD:
case SCI_STP_DEV_NCQ:
case SCI_STP_DEV_NCQ_ERROR:
case SCI_STP_DEV_ATAPI_ERROR:
status = common_complete_io(iport, idev, ireq);
if (status != SCI_SUCCESS)
break;
if (ireq->sci_status == SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) {
/* This request causes hardware error, device needs to be Lun Reset.
* So here we force the state machine to IDLE state so the rest IOs
* can reach RNC state handler, these IOs will be completed by RNC with
* status of "DEVICE_RESET_REQUIRED", instead of "INVALID STATE".
*/
sci_change_state(sm, SCI_STP_DEV_AWAIT_RESET);
} else if (idev->started_request_count == 0)
sci_change_state(sm, SCI_STP_DEV_IDLE);
break;
case SCI_SMP_DEV_CMD:
status = common_complete_io(iport, idev, ireq);
if (status != SCI_SUCCESS)
break;
sci_change_state(sm, SCI_SMP_DEV_IDLE);
break;
case SCI_DEV_STOPPING:
status = common_complete_io(iport, idev, ireq);
if (status != SCI_SUCCESS)
break;
if (idev->started_request_count == 0)
sci_remote_node_context_destruct(&idev->rnc,
rnc_destruct_done,
idev);
break;
}
if (status != SCI_SUCCESS)
dev_err(scirdev_to_dev(idev),
"%s: Port:0x%p Device:0x%p Request:0x%p Status:0x%x "
"could not complete\n", __func__, iport,
idev, ireq, status);
else
isci_put_device(idev);
return status;
}
static void sci_remote_device_continue_request(void *dev)
{
struct isci_remote_device *idev = dev;
/* we need to check if this request is still valid to continue. */
if (idev->working_request)
sci_controller_continue_io(idev->working_request);
}
enum sci_status sci_remote_device_start_task(struct isci_host *ihost,
struct isci_remote_device *idev,
struct isci_request *ireq)
{
struct sci_base_state_machine *sm = &idev->sm;
enum sci_remote_device_states state = sm->current_state_id;
struct isci_port *iport = idev->owning_port;
enum sci_status status;
switch (state) {
case SCI_DEV_INITIAL:
case SCI_DEV_STOPPED:
case SCI_DEV_STARTING:
case SCI_SMP_DEV_IDLE:
case SCI_SMP_DEV_CMD:
case SCI_DEV_STOPPING:
case SCI_DEV_FAILED:
case SCI_DEV_RESETTING:
case SCI_DEV_FINAL:
default:
dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
__func__, state);
return SCI_FAILURE_INVALID_STATE;
case SCI_STP_DEV_IDLE:
case SCI_STP_DEV_CMD:
case SCI_STP_DEV_NCQ:
case SCI_STP_DEV_NCQ_ERROR:
case SCI_STP_DEV_AWAIT_RESET:
status = sci_port_start_io(iport, idev, ireq);
if (status != SCI_SUCCESS)
return status;
status = sci_remote_node_context_start_task(&idev->rnc, ireq);
if (status != SCI_SUCCESS)
goto out;
status = sci_request_start(ireq);
if (status != SCI_SUCCESS)
goto out;
/* Note: If the remote device state is not IDLE this will
* replace the request that probably resulted in the task
* management request.
*/
idev->working_request = ireq;
sci_change_state(sm, SCI_STP_DEV_CMD);
/* The remote node context must cleanup the TCi to NCQ mapping
* table. The only way to do this correctly is to either write
* to the TLCR register or to invalidate and repost the RNC. In
* either case the remote node context state machine will take
* the correct action when the remote node context is suspended
* and later resumed.
*/
sci_remote_node_context_suspend(&idev->rnc,
SCI_SOFTWARE_SUSPENSION, NULL, NULL);
sci_remote_node_context_resume(&idev->rnc,
sci_remote_device_continue_request,
idev);
out:
sci_remote_device_start_request(idev, ireq, status);
/* We need to let the controller start request handler know that
* it can't post TC yet. We will provide a callback function to
* post TC when RNC gets resumed.
*/
return SCI_FAILURE_RESET_DEVICE_PARTIAL_SUCCESS;
case SCI_DEV_READY:
status = sci_port_start_io(iport, idev, ireq);
if (status != SCI_SUCCESS)
return status;
status = sci_remote_node_context_start_task(&idev->rnc, ireq);
if (status != SCI_SUCCESS)
break;
status = sci_request_start(ireq);
break;
}
sci_remote_device_start_request(idev, ireq, status);
return status;
}
void sci_remote_device_post_request(struct isci_remote_device *idev, u32 request)
{
struct isci_port *iport = idev->owning_port;
u32 context;
context = request |
(ISCI_PEG << SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
(iport->physical_port_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
idev->rnc.remote_node_index;
sci_controller_post_request(iport->owning_controller, context);
}
/* called once the remote node context has transisitioned to a
* ready state. This is the indication that the remote device object can also
* transition to ready.
*/
static void remote_device_resume_done(void *_dev)
{
struct isci_remote_device *idev = _dev;
if (is_remote_device_ready(idev))
return;
/* go 'ready' if we are not already in a ready state */
sci_change_state(&idev->sm, SCI_DEV_READY);
}
static void sci_stp_remote_device_ready_idle_substate_resume_complete_handler(void *_dev)
{
struct isci_remote_device *idev = _dev;
struct isci_host *ihost = idev->owning_port->owning_controller;
/* For NCQ operation we do not issue a isci_remote_device_not_ready().
* As a result, avoid sending the ready notification.
*/
if (idev->sm.previous_state_id != SCI_STP_DEV_NCQ)
isci_remote_device_ready(ihost, idev);
}
static void sci_remote_device_initial_state_enter(struct sci_base_state_machine *sm)
{
struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
/* Initial state is a transitional state to the stopped state */
sci_change_state(&idev->sm, SCI_DEV_STOPPED);
}
/**
* sci_remote_device_destruct() - free remote node context and destruct
* @remote_device: This parameter specifies the remote device to be destructed.
*
* Remote device objects are a limited resource. As such, they must be
* protected. Thus calls to construct and destruct are mutually exclusive and
* non-reentrant. The return value shall indicate if the device was
* successfully destructed or if some failure occurred. enum sci_status This value
* is returned if the device is successfully destructed.
* SCI_FAILURE_INVALID_REMOTE_DEVICE This value is returned if the supplied
* device isn't valid (e.g. it's already been destoryed, the handle isn't
* valid, etc.).
*/
static enum sci_status sci_remote_device_destruct(struct isci_remote_device *idev)
{
struct sci_base_state_machine *sm = &idev->sm;
enum sci_remote_device_states state = sm->current_state_id;
struct isci_host *ihost;
if (state != SCI_DEV_STOPPED) {
dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
__func__, state);
return SCI_FAILURE_INVALID_STATE;
}
ihost = idev->owning_port->owning_controller;
sci_controller_free_remote_node_context(ihost, idev,
idev->rnc.remote_node_index);
idev->rnc.remote_node_index = SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX;
sci_change_state(sm, SCI_DEV_FINAL);
return SCI_SUCCESS;
}
/**
* isci_remote_device_deconstruct() - This function frees an isci_remote_device.
* @ihost: This parameter specifies the isci host object.
* @idev: This parameter specifies the remote device to be freed.
*
*/
static void isci_remote_device_deconstruct(struct isci_host *ihost, struct isci_remote_device *idev)
{
dev_dbg(&ihost->pdev->dev,
"%s: isci_device = %p\n", __func__, idev);
/* There should not be any outstanding io's. All paths to
* here should go through isci_remote_device_nuke_requests.
* If we hit this condition, we will need a way to complete
* io requests in process */
BUG_ON(!list_empty(&idev->reqs_in_process));
sci_remote_device_destruct(idev);
list_del_init(&idev->node);
isci_put_device(idev);
}
static void sci_remote_device_stopped_state_enter(struct sci_base_state_machine *sm)
{
struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
struct isci_host *ihost = idev->owning_port->owning_controller;
u32 prev_state;
/* If we are entering from the stopping state let the SCI User know that
* the stop operation has completed.
*/
prev_state = idev->sm.previous_state_id;
if (prev_state == SCI_DEV_STOPPING)
isci_remote_device_deconstruct(ihost, idev);
sci_controller_remote_device_stopped(ihost, idev);
}
static void sci_remote_device_starting_state_enter(struct sci_base_state_machine *sm)
{
struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
struct isci_host *ihost = idev->owning_port->owning_controller;
isci_remote_device_not_ready(ihost, idev,
SCIC_REMOTE_DEVICE_NOT_READY_START_REQUESTED);
}
static void sci_remote_device_ready_state_enter(struct sci_base_state_machine *sm)
{
struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
struct isci_host *ihost = idev->owning_port->owning_controller;
struct domain_device *dev = idev->domain_dev;
if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_SATA)) {
sci_change_state(&idev->sm, SCI_STP_DEV_IDLE);
} else if (dev_is_expander(dev)) {
sci_change_state(&idev->sm, SCI_SMP_DEV_IDLE);
} else
isci_remote_device_ready(ihost, idev);
}
static void sci_remote_device_ready_state_exit(struct sci_base_state_machine *sm)
{
struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
struct domain_device *dev = idev->domain_dev;
if (dev->dev_type == SAS_END_DEV) {
struct isci_host *ihost = idev->owning_port->owning_controller;
isci_remote_device_not_ready(ihost, idev,
SCIC_REMOTE_DEVICE_NOT_READY_STOP_REQUESTED);
}
}
static void sci_remote_device_resetting_state_enter(struct sci_base_state_machine *sm)
{
struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
sci_remote_node_context_suspend(
&idev->rnc, SCI_SOFTWARE_SUSPENSION, NULL, NULL);
}
static void sci_remote_device_resetting_state_exit(struct sci_base_state_machine *sm)
{
struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
sci_remote_node_context_resume(&idev->rnc, NULL, NULL);
}
static void sci_stp_remote_device_ready_idle_substate_enter(struct sci_base_state_machine *sm)
{
struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
idev->working_request = NULL;
if (sci_remote_node_context_is_ready(&idev->rnc)) {
/*
* Since the RNC is ready, it's alright to finish completion
* processing (e.g. signal the remote device is ready). */
sci_stp_remote_device_ready_idle_substate_resume_complete_handler(idev);
} else {
sci_remote_node_context_resume(&idev->rnc,
sci_stp_remote_device_ready_idle_substate_resume_complete_handler,
idev);
}
}
static void sci_stp_remote_device_ready_cmd_substate_enter(struct sci_base_state_machine *sm)
{
struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
struct isci_host *ihost = idev->owning_port->owning_controller;
BUG_ON(idev->working_request == NULL);
isci_remote_device_not_ready(ihost, idev,
SCIC_REMOTE_DEVICE_NOT_READY_SATA_REQUEST_STARTED);
}
static void sci_stp_remote_device_ready_ncq_error_substate_enter(struct sci_base_state_machine *sm)
{
struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
struct isci_host *ihost = idev->owning_port->owning_controller;
if (idev->not_ready_reason == SCIC_REMOTE_DEVICE_NOT_READY_SATA_SDB_ERROR_FIS_RECEIVED)
isci_remote_device_not_ready(ihost, idev,
idev->not_ready_reason);
}
static void sci_smp_remote_device_ready_idle_substate_enter(struct sci_base_state_machine *sm)
{
struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
struct isci_host *ihost = idev->owning_port->owning_controller;
isci_remote_device_ready(ihost, idev);
}
static void sci_smp_remote_device_ready_cmd_substate_enter(struct sci_base_state_machine *sm)
{
struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
struct isci_host *ihost = idev->owning_port->owning_controller;
BUG_ON(idev->working_request == NULL);
isci_remote_device_not_ready(ihost, idev,
SCIC_REMOTE_DEVICE_NOT_READY_SMP_REQUEST_STARTED);
}
static void sci_smp_remote_device_ready_cmd_substate_exit(struct sci_base_state_machine *sm)
{
struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
idev->working_request = NULL;
}
static const struct sci_base_state sci_remote_device_state_table[] = {
[SCI_DEV_INITIAL] = {
.enter_state = sci_remote_device_initial_state_enter,
},
[SCI_DEV_STOPPED] = {
.enter_state = sci_remote_device_stopped_state_enter,
},
[SCI_DEV_STARTING] = {
.enter_state = sci_remote_device_starting_state_enter,
},
[SCI_DEV_READY] = {
.enter_state = sci_remote_device_ready_state_enter,
.exit_state = sci_remote_device_ready_state_exit
},
[SCI_STP_DEV_IDLE] = {
.enter_state = sci_stp_remote_device_ready_idle_substate_enter,
},
[SCI_STP_DEV_CMD] = {
.enter_state = sci_stp_remote_device_ready_cmd_substate_enter,
},
[SCI_STP_DEV_NCQ] = { },
[SCI_STP_DEV_NCQ_ERROR] = {
.enter_state = sci_stp_remote_device_ready_ncq_error_substate_enter,
},
[SCI_STP_DEV_ATAPI_ERROR] = { },
[SCI_STP_DEV_AWAIT_RESET] = { },
[SCI_SMP_DEV_IDLE] = {
.enter_state = sci_smp_remote_device_ready_idle_substate_enter,
},
[SCI_SMP_DEV_CMD] = {
.enter_state = sci_smp_remote_device_ready_cmd_substate_enter,
.exit_state = sci_smp_remote_device_ready_cmd_substate_exit,
},
[SCI_DEV_STOPPING] = { },
[SCI_DEV_FAILED] = { },
[SCI_DEV_RESETTING] = {
.enter_state = sci_remote_device_resetting_state_enter,
.exit_state = sci_remote_device_resetting_state_exit
},
[SCI_DEV_FINAL] = { },
};
/**
* sci_remote_device_construct() - common construction
* @sci_port: SAS/SATA port through which this device is accessed.
* @sci_dev: remote device to construct
*
* This routine just performs benign initialization and does not
* allocate the remote_node_context which is left to
* sci_remote_device_[de]a_construct(). sci_remote_device_destruct()
* frees the remote_node_context(s) for the device.
*/
static void sci_remote_device_construct(struct isci_port *iport,
struct isci_remote_device *idev)
{
idev->owning_port = iport;
idev->started_request_count = 0;
sci_init_sm(&idev->sm, sci_remote_device_state_table, SCI_DEV_INITIAL);
sci_remote_node_context_construct(&idev->rnc,
SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX);
}
/**
* sci_remote_device_da_construct() - construct direct attached device.
*
* The information (e.g. IAF, Signature FIS, etc.) necessary to build
* the device is known to the SCI Core since it is contained in the
* sci_phy object. Remote node context(s) is/are a global resource
* allocated by this routine, freed by sci_remote_device_destruct().
*
* Returns:
* SCI_FAILURE_DEVICE_EXISTS - device has already been constructed.
* SCI_FAILURE_UNSUPPORTED_PROTOCOL - e.g. sas device attached to
* sata-only controller instance.
* SCI_FAILURE_INSUFFICIENT_RESOURCES - remote node contexts exhausted.
*/
static enum sci_status sci_remote_device_da_construct(struct isci_port *iport,
struct isci_remote_device *idev)
{
enum sci_status status;
struct sci_port_properties properties;
struct domain_device *dev = idev->domain_dev;
sci_remote_device_construct(iport, idev);
/*
* This information is request to determine how many remote node context
* entries will be needed to store the remote node.
*/
idev->is_direct_attached = true;
sci_port_get_properties(iport, &properties);
/* Get accurate port width from port's phy mask for a DA device. */
idev->device_port_width = hweight32(properties.phy_mask);
status = sci_controller_allocate_remote_node_context(iport->owning_controller,
idev,
&idev->rnc.remote_node_index);
if (status != SCI_SUCCESS)
return status;
if (dev->dev_type == SAS_END_DEV || dev->dev_type == SATA_DEV ||
(dev->tproto & SAS_PROTOCOL_STP) || dev_is_expander(dev))
/* pass */;
else
return SCI_FAILURE_UNSUPPORTED_PROTOCOL;
idev->connection_rate = sci_port_get_max_allowed_speed(iport);
return SCI_SUCCESS;
}
/**
* sci_remote_device_ea_construct() - construct expander attached device
*
* Remote node context(s) is/are a global resource allocated by this
* routine, freed by sci_remote_device_destruct().
*
* Returns:
* SCI_FAILURE_DEVICE_EXISTS - device has already been constructed.
* SCI_FAILURE_UNSUPPORTED_PROTOCOL - e.g. sas device attached to
* sata-only controller instance.
* SCI_FAILURE_INSUFFICIENT_RESOURCES - remote node contexts exhausted.
*/
static enum sci_status sci_remote_device_ea_construct(struct isci_port *iport,
struct isci_remote_device *idev)
{
struct domain_device *dev = idev->domain_dev;
enum sci_status status;
sci_remote_device_construct(iport, idev);
status = sci_controller_allocate_remote_node_context(iport->owning_controller,
idev,
&idev->rnc.remote_node_index);
if (status != SCI_SUCCESS)
return status;
if (dev->dev_type == SAS_END_DEV || dev->dev_type == SATA_DEV ||
(dev->tproto & SAS_PROTOCOL_STP) || dev_is_expander(dev))
/* pass */;
else
return SCI_FAILURE_UNSUPPORTED_PROTOCOL;
/*
* For SAS-2 the physical link rate is actually a logical link
* rate that incorporates multiplexing. The SCU doesn't
* incorporate multiplexing and for the purposes of the
* connection the logical link rate is that same as the
* physical. Furthermore, the SAS-2 and SAS-1.1 fields overlay
* one another, so this code works for both situations. */
idev->connection_rate = min_t(u16, sci_port_get_max_allowed_speed(iport),
dev->linkrate);
/* / @todo Should I assign the port width by reading all of the phys on the port? */
idev->device_port_width = 1;
return SCI_SUCCESS;
}
/**
* sci_remote_device_start() - This method will start the supplied remote
* device. This method enables normal IO requests to flow through to the
* remote device.
* @remote_device: This parameter specifies the device to be started.
* @timeout: This parameter specifies the number of milliseconds in which the
* start operation should complete.
*
* An indication of whether the device was successfully started. SCI_SUCCESS
* This value is returned if the device was successfully started.
* SCI_FAILURE_INVALID_PHY This value is returned if the user attempts to start
* the device when there have been no phys added to it.
*/
static enum sci_status sci_remote_device_start(struct isci_remote_device *idev,
u32 timeout)
{
struct sci_base_state_machine *sm = &idev->sm;
enum sci_remote_device_states state = sm->current_state_id;
enum sci_status status;
if (state != SCI_DEV_STOPPED) {
dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
__func__, state);
return SCI_FAILURE_INVALID_STATE;
}
status = sci_remote_node_context_resume(&idev->rnc,
remote_device_resume_done,
idev);
if (status != SCI_SUCCESS)
return status;
sci_change_state(sm, SCI_DEV_STARTING);
return SCI_SUCCESS;
}
static enum sci_status isci_remote_device_construct(struct isci_port *iport,
struct isci_remote_device *idev)
{
struct isci_host *ihost = iport->isci_host;
struct domain_device *dev = idev->domain_dev;
enum sci_status status;
if (dev->parent && dev_is_expander(dev->parent))
status = sci_remote_device_ea_construct(iport, idev);
else
status = sci_remote_device_da_construct(iport, idev);
if (status != SCI_SUCCESS) {
dev_dbg(&ihost->pdev->dev, "%s: construct failed: %d\n",
__func__, status);
return status;
}
/* start the device. */
status = sci_remote_device_start(idev, ISCI_REMOTE_DEVICE_START_TIMEOUT);
if (status != SCI_SUCCESS)
dev_warn(&ihost->pdev->dev, "remote device start failed: %d\n",
status);
return status;
}
void isci_remote_device_nuke_requests(struct isci_host *ihost, struct isci_remote_device *idev)
{
DECLARE_COMPLETION_ONSTACK(aborted_task_completion);
dev_dbg(&ihost->pdev->dev,
"%s: idev = %p\n", __func__, idev);
/* Cleanup all requests pending for this device. */
isci_terminate_pending_requests(ihost, idev);
dev_dbg(&ihost->pdev->dev,
"%s: idev = %p, done\n", __func__, idev);
}
/**
* This function builds the isci_remote_device when a libsas dev_found message
* is received.
* @isci_host: This parameter specifies the isci host object.
* @port: This parameter specifies the isci_port conected to this device.
*
* pointer to new isci_remote_device.
*/
static struct isci_remote_device *
isci_remote_device_alloc(struct isci_host *ihost, struct isci_port *iport)
{
struct isci_remote_device *idev;
int i;
for (i = 0; i < SCI_MAX_REMOTE_DEVICES; i++) {
idev = &ihost->devices[i];
if (!test_and_set_bit(IDEV_ALLOCATED, &idev->flags))
break;
}
if (i >= SCI_MAX_REMOTE_DEVICES) {
dev_warn(&ihost->pdev->dev, "%s: failed\n", __func__);
return NULL;
}
if (WARN_ONCE(!list_empty(&idev->reqs_in_process), "found requests in process\n"))
return NULL;
if (WARN_ONCE(!list_empty(&idev->node), "found non-idle remote device\n"))
return NULL;
return idev;
}
void isci_remote_device_release(struct kref *kref)
{
struct isci_remote_device *idev = container_of(kref, typeof(*idev), kref);
struct isci_host *ihost = idev->isci_port->isci_host;
idev->domain_dev = NULL;
idev->isci_port = NULL;
clear_bit(IDEV_START_PENDING, &idev->flags);
clear_bit(IDEV_STOP_PENDING, &idev->flags);
clear_bit(IDEV_IO_READY, &idev->flags);
clear_bit(IDEV_GONE, &idev->flags);
clear_bit(IDEV_EH, &idev->flags);
smp_mb__before_clear_bit();
clear_bit(IDEV_ALLOCATED, &idev->flags);
wake_up(&ihost->eventq);
}
/**
* isci_remote_device_stop() - This function is called internally to stop the
* remote device.
* @isci_host: This parameter specifies the isci host object.
* @isci_device: This parameter specifies the remote device.
*
* The status of the ihost request to stop.
*/
enum sci_status isci_remote_device_stop(struct isci_host *ihost, struct isci_remote_device *idev)
{
enum sci_status status;
unsigned long flags;
dev_dbg(&ihost->pdev->dev,
"%s: isci_device = %p\n", __func__, idev);
spin_lock_irqsave(&ihost->scic_lock, flags);
idev->domain_dev->lldd_dev = NULL; /* disable new lookups */
set_bit(IDEV_GONE, &idev->flags);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
/* Kill all outstanding requests. */
isci_remote_device_nuke_requests(ihost, idev);
set_bit(IDEV_STOP_PENDING, &idev->flags);
spin_lock_irqsave(&ihost->scic_lock, flags);
status = sci_remote_device_stop(idev, 50);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
/* Wait for the stop complete callback. */
if (WARN_ONCE(status != SCI_SUCCESS, "failed to stop device\n"))
/* nothing to wait for */;
else
wait_for_device_stop(ihost, idev);
return status;
}
/**
* isci_remote_device_gone() - This function is called by libsas when a domain
* device is removed.
* @domain_device: This parameter specifies the libsas domain device.
*
*/
void isci_remote_device_gone(struct domain_device *dev)
{
struct isci_host *ihost = dev_to_ihost(dev);
struct isci_remote_device *idev = dev->lldd_dev;
dev_dbg(&ihost->pdev->dev,
"%s: domain_device = %p, isci_device = %p, isci_port = %p\n",
__func__, dev, idev, idev->isci_port);
isci_remote_device_stop(ihost, idev);
}
/**
* isci_remote_device_found() - This function is called by libsas when a remote
* device is discovered. A remote device object is created and started. the
* function then sleeps until the sci core device started message is
* received.
* @domain_device: This parameter specifies the libsas domain device.
*
* status, zero indicates success.
*/
int isci_remote_device_found(struct domain_device *domain_dev)
{
struct isci_host *isci_host = dev_to_ihost(domain_dev);
struct isci_port *isci_port;
struct isci_phy *isci_phy;
struct asd_sas_port *sas_port;
struct asd_sas_phy *sas_phy;
struct isci_remote_device *isci_device;
enum sci_status status;
dev_dbg(&isci_host->pdev->dev,
"%s: domain_device = %p\n", __func__, domain_dev);
wait_for_start(isci_host);
sas_port = domain_dev->port;
sas_phy = list_first_entry(&sas_port->phy_list, struct asd_sas_phy,
port_phy_el);
isci_phy = to_iphy(sas_phy);
isci_port = isci_phy->isci_port;
/* we are being called for a device on this port,
* so it has to come up eventually
*/
wait_for_completion(&isci_port->start_complete);
if ((isci_stopping == isci_port_get_state(isci_port)) ||
(isci_stopped == isci_port_get_state(isci_port)))
return -ENODEV;
isci_device = isci_remote_device_alloc(isci_host, isci_port);
if (!isci_device)
return -ENODEV;
kref_init(&isci_device->kref);
INIT_LIST_HEAD(&isci_device->node);
spin_lock_irq(&isci_host->scic_lock);
isci_device->domain_dev = domain_dev;
isci_device->isci_port = isci_port;
list_add_tail(&isci_device->node, &isci_port->remote_dev_list);
set_bit(IDEV_START_PENDING, &isci_device->flags);
status = isci_remote_device_construct(isci_port, isci_device);
dev_dbg(&isci_host->pdev->dev,
"%s: isci_device = %p\n",
__func__, isci_device);
if (status == SCI_SUCCESS) {
/* device came up, advertise it to the world */
domain_dev->lldd_dev = isci_device;
} else
isci_put_device(isci_device);
spin_unlock_irq(&isci_host->scic_lock);
/* wait for the device ready callback. */
wait_for_device_start(isci_host, isci_device);
return status == SCI_SUCCESS ? 0 : -ENODEV;
}
