/* * 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.
*/
/** * isci_task_refuse() - complete the request to the upper layer driver in * the case where an I/O needs to be completed back in the submit path. * @ihost: host on which the the request was queued * @task: request to complete * @response: response code for the completed task. * @status: status code for the completed task. *
*/ staticvoid isci_task_refuse(struct isci_host *ihost, struct sas_task *task, enum service_response response, enum exec_status status)
#define for_each_sas_task(num, task) \ for (; num > 0; num--,\
task = list_entry(task->list.next, struct sas_task, list))
staticinlineint isci_device_io_ready(struct isci_remote_device *idev, struct sas_task *task)
{ return idev ? test_bit(IDEV_IO_READY, &idev->flags) ||
(test_bit(IDEV_IO_NCQERROR, &idev->flags) &&
isci_task_is_ncq_recovery(task))
: 0;
} /** * isci_task_execute_task() - This function is one of the SAS Domain Template * functions. This function is called by libsas to send a task down to * hardware. * @task: This parameter specifies the SAS task to send. * @gfp_flags: This parameter specifies the context of this call. * * status, zero indicates success.
*/ int isci_task_execute_task(struct sas_task *task, gfp_t gfp_flags)
{ struct isci_host *ihost = dev_to_ihost(task->dev); struct isci_remote_device *idev; unsignedlong flags; enum sci_status status = SCI_FAILURE; bool io_ready;
u16 tag;
if (!idev) {
isci_task_refuse(ihost, task, SAS_TASK_UNDELIVERED,
SAS_DEVICE_UNKNOWN);
} elseif (!io_ready || tag == SCI_CONTROLLER_INVALID_IO_TAG) { /* Indicate QUEUE_FULL so that the scsi midlayer * retries.
*/
isci_task_refuse(ihost, task, SAS_TASK_COMPLETE,
SAS_QUEUE_FULL);
} else { /* There is a device and it's ready for I/O. */
spin_lock_irqsave(&task->task_state_lock, flags);
if (task->task_state_flags & SAS_TASK_STATE_ABORTED) { /* The I/O was aborted. */
spin_unlock_irqrestore(&task->task_state_lock, flags);
/* do common allocation and init of request object. */
ireq = isci_io_request_from_tag(ihost, task, tag);
spin_unlock_irqrestore(&task->task_state_lock, flags);
/* build and send the request. */ /* do common allocation and init of request object. */
status = isci_request_execute(ihost, idev, task, ireq);
if (status != SCI_SUCCESS) { if (test_bit(IDEV_GONE, &idev->flags)) { /* Indicate that the device * is gone.
*/
isci_task_refuse(ihost, task,
SAS_TASK_UNDELIVERED,
SAS_DEVICE_UNKNOWN);
} else { /* Indicate QUEUE_FULL so that * the scsi midlayer retries. * If the request failed for * remote device reasons, it * gets returned as * SAS_TASK_UNDELIVERED next * time through.
*/
isci_task_refuse(ihost, task,
SAS_TASK_COMPLETE,
SAS_QUEUE_FULL);
}
}
}
}
if (status != SCI_SUCCESS && tag != SCI_CONTROLLER_INVALID_IO_TAG) {
spin_lock_irqsave(&ihost->scic_lock, flags); /* command never hit the device, so just free * the tci and skip the sequence increment
*/
isci_tci_free(ihost, ISCI_TAG_TCI(tag));
spin_unlock_irqrestore(&ihost->scic_lock, flags);
}
/* XXX convert to get this from task->tproto like other drivers */ if (dev->dev_type == SAS_END_DEVICE) {
isci_tmf->proto = SAS_PROTOCOL_SSP;
sci_task_request_construct_ssp(ireq);
}
/* The RNC must be unsuspended before the TMF can get a response. */
isci_remote_device_resume_from_abort(ihost, idev);
/* Wait for the TMF to complete, or a timeout. */
timeleft = wait_for_completion_timeout(&completion,
msecs_to_jiffies(timeout_ms));
if (timeleft == 0) { /* The TMF did not complete - this could be because * of an unplug. Terminate the TMF request now.
*/
isci_remote_device_suspend_terminate(ihost, idev, ireq);
}
isci_print_tmf(ihost, tmf);
if (tmf->status == SCI_SUCCESS)
ret = TMF_RESP_FUNC_COMPLETE; elseif (tmf->status == SCI_FAILURE_IO_RESPONSE_VALID) {
dev_dbg(&ihost->pdev->dev, "%s: tmf.status == " "SCI_FAILURE_IO_RESPONSE_VALID\n",
__func__);
ret = TMF_RESP_FUNC_COMPLETE;
} /* Else - leave the default "failed" status alone. */
/* * isci_task_send_lu_reset_sas() - This function is called by of the SAS Domain * Template functions. * @lun: This parameter specifies the lun to be reset. * * status, zero indicates success.
*/ staticint isci_task_send_lu_reset_sas( struct isci_host *isci_host, struct isci_remote_device *isci_device,
u8 *lun)
{ struct isci_tmf tmf; int ret = TMF_RESP_FUNC_FAILED;
dev_dbg(&isci_host->pdev->dev, "%s: isci_host = %p, isci_device = %p\n",
__func__, isci_host, isci_device); /* Send the LUN reset to the target. By the time the call returns, * the TMF has fully exected in the target (in which case the return * value is "TMF_RESP_FUNC_COMPLETE", or the request timed-out (or * was otherwise unable to be executed ("TMF_RESP_FUNC_FAILED").
*/
isci_task_build_tmf(&tmf, isci_tmf_ssp_lun_reset);
#define ISCI_LU_RESET_TIMEOUT_MS 2000 /* 2 second timeout. */
ret = isci_task_execute_tmf(isci_host, isci_device, &tmf, ISCI_LU_RESET_TIMEOUT_MS);
if (!idev) { /* If the device is gone, escalate to I_T_Nexus_Reset. */
dev_dbg(&ihost->pdev->dev, "%s: No dev\n", __func__);
ret = TMF_RESP_FUNC_FAILED; goto out;
}
/* Suspend the RNC, kill all TCs */ if (isci_remote_device_suspend_terminate(ihost, idev, NULL)
!= SCI_SUCCESS) { /* The suspend/terminate only fails if isci_get_device fails */
ret = TMF_RESP_FUNC_FAILED; goto out;
} /* All pending I/Os have been terminated and cleaned up. */ if (!test_bit(IDEV_GONE, &idev->flags)) { if (dev_is_sata(dev))
sas_ata_schedule_reset(dev); else /* Send the task management part of the reset. */
ret = isci_task_send_lu_reset_sas(ihost, idev, lun);
}
out:
isci_put_device(idev); return ret;
}
/* int (*lldd_clear_nexus_port)(struct asd_sas_port *); */ int isci_task_clear_nexus_port(struct asd_sas_port *port)
{ return TMF_RESP_FUNC_FAILED;
}
int isci_task_clear_nexus_ha(struct sas_ha_struct *ha)
{ return TMF_RESP_FUNC_FAILED;
}
/* Task Management Functions. Must be called from process context. */
/** * isci_task_abort_task() - This function is one of the SAS Domain Template * functions. This function is called by libsas to abort a specified task. * @task: This parameter specifies the SAS task to abort. * * status, zero indicates success.
*/ int isci_task_abort_task(struct sas_task *task)
{ struct isci_host *ihost = dev_to_ihost(task->dev);
DECLARE_COMPLETION_ONSTACK(aborted_io_completion); struct isci_request *old_request = NULL; struct isci_remote_device *idev = NULL; struct isci_tmf tmf; int ret = TMF_RESP_FUNC_FAILED; unsignedlong flags; int target_done_already = 0;
/* Get the isci_request reference from the task. Note that * this check does not depend on the pending request list * in the device, because tasks driving resets may land here * after completion in the core.
*/
spin_lock_irqsave(&ihost->scic_lock, flags);
spin_lock(&task->task_state_lock);
old_request = task->lldd_task;
/* If task is already done, the request isn't valid */ if (!(task->task_state_flags & SAS_TASK_STATE_DONE) &&
old_request) {
idev = isci_get_device(task->dev->lldd_dev);
target_done_already = test_bit(IREQ_COMPLETE_IN_TARGET,
&old_request->flags);
}
spin_unlock(&task->task_state_lock);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
/* Device reset conditions signalled in task_state_flags are the * responsbility of libsas to observe at the start of the error * handler thread.
*/ if (!idev || !old_request) { /* The request has already completed and there * is nothing to do here other than to set the task * done bit, and indicate that the task abort function * was successful.
*/
spin_lock_irqsave(&task->task_state_lock, flags);
task->task_state_flags |= SAS_TASK_STATE_DONE;
task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
spin_unlock_irqrestore(&task->task_state_lock, flags);
ret = TMF_RESP_FUNC_COMPLETE;
dev_warn(&ihost->pdev->dev, "%s: abort task not needed for %p\n",
__func__, task); goto out;
} /* Suspend the RNC, kill the TC */ if (isci_remote_device_suspend_terminate(ihost, idev, old_request)
!= SCI_SUCCESS) {
dev_warn(&ihost->pdev->dev, "%s: isci_remote_device_reset_terminate(dev=%p, " "req=%p, task=%p) failed\n",
__func__, idev, old_request, task);
ret = TMF_RESP_FUNC_FAILED; goto out;
}
spin_lock_irqsave(&ihost->scic_lock, flags);
/** * isci_task_abort_task_set() - This function is one of the SAS Domain Template * functions. This is one of the Task Management functoins called by libsas, * to abort all task for the given lun. * @d_device: This parameter specifies the domain device associated with this * request. * @lun: This parameter specifies the lun associated with this request. * * status, zero indicates success.
*/ int isci_task_abort_task_set( struct domain_device *d_device,
u8 *lun)
{ return TMF_RESP_FUNC_FAILED;
}
/** * isci_task_clear_task_set() - This function is one of the SAS Domain Template * functions. This is one of the Task Management functoins called by libsas. * @d_device: This parameter specifies the domain device associated with this * request. * @lun: This parameter specifies the lun associated with this request. * * status, zero indicates success.
*/ int isci_task_clear_task_set( struct domain_device *d_device,
u8 *lun)
{ return TMF_RESP_FUNC_FAILED;
}
/** * isci_task_query_task() - This function is implemented to cause libsas to * correctly escalate the failed abort to a LUN or target reset (this is * because sas_scsi_find_task libsas function does not correctly interpret * all return codes from the abort task call). When TMF_RESP_FUNC_SUCC is * returned, libsas turns this into a LUN reset; when FUNC_FAILED is * returned, libsas will turn this into a target reset * @task: This parameter specifies the sas task being queried. * * status, zero indicates success.
*/ int isci_task_query_task( struct sas_task *task)
{ /* See if there is a pending device reset for this device. */ if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET) return TMF_RESP_FUNC_FAILED; else return TMF_RESP_FUNC_SUCC;
}
/* * isci_task_request_complete() - This function is called by the sci core when * an task request completes. * @ihost: This parameter specifies the ISCI host object * @ireq: This parameter is the completed isci_request object. * @completion_status: This parameter specifies the completion status from the * sci core. * * none.
*/ void
isci_task_request_complete(struct isci_host *ihost, struct isci_request *ireq, enum sci_task_status completion_status)
{ struct isci_tmf *tmf = isci_request_access_tmf(ireq); struct completion *tmf_complete = NULL;
/* Suspend the RNC, terminate all outstanding TCs. */ if (isci_remote_device_suspend_terminate(ihost, idev, NULL)
!= SCI_SUCCESS) {
rc = TMF_RESP_FUNC_FAILED; goto out;
} /* Note that since the termination for outstanding requests succeeded, * this function will return success. This is because the resets will * only fail if the device has been removed (ie. hotplug), and the * primary duty of this function is to cleanup tasks, so that is the * relevant status.
*/ if (!test_bit(IDEV_GONE, &idev->flags)) { if (scsi_is_sas_phy_local(phy)) { struct isci_phy *iphy = &ihost->phys[phy->number];
reset_stat = isci_port_perform_hard_reset(ihost, iport,
iphy);
} else
reset_stat = sas_phy_reset(phy, !dev_is_sata(dev));
} /* Explicitly resume the RNC here, since there was no task sent. */
isci_remote_device_resume_from_abort(ihost, idev);
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