diff options
Diffstat (limited to 'drivers/scsi/isci/task.c')
| -rw-r--r-- | drivers/scsi/isci/task.c | 781 |
1 files changed, 781 insertions, 0 deletions
diff --git a/drivers/scsi/isci/task.c b/drivers/scsi/isci/task.c new file mode 100644 index 000000000..c514b2029 --- /dev/null +++ b/drivers/scsi/isci/task.c @@ -0,0 +1,781 @@ +/* + * 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 <linux/completion.h> +#include <linux/irqflags.h> +#include "sas.h" +#include <scsi/libsas.h> +#include "remote_device.h" +#include "remote_node_context.h" +#include "isci.h" +#include "request.h" +#include "task.h" +#include "host.h" + +/** +* 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. +* +*/ +static void isci_task_refuse(struct isci_host *ihost, struct sas_task *task, + enum service_response response, + enum exec_status status) + +{ + unsigned long flags; + + /* Normal notification (task_done) */ + dev_dbg(&ihost->pdev->dev, "%s: task = %p, response=%d, status=%d\n", + __func__, task, response, status); + + spin_lock_irqsave(&task->task_state_lock, flags); + + task->task_status.resp = response; + task->task_status.stat = status; + + /* Normal notification (task_done) */ + task->task_state_flags |= SAS_TASK_STATE_DONE; + task->task_state_flags &= ~SAS_TASK_STATE_PENDING; + task->lldd_task = NULL; + spin_unlock_irqrestore(&task->task_state_lock, flags); + + task->task_done(task); +} + +#define for_each_sas_task(num, task) \ + for (; num > 0; num--,\ + task = list_entry(task->list.next, struct sas_task, list)) + + +static inline int 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; + unsigned long flags; + enum sci_status status = SCI_FAILURE; + bool io_ready; + u16 tag; + + spin_lock_irqsave(&ihost->scic_lock, flags); + idev = isci_lookup_device(task->dev); + io_ready = isci_device_io_ready(idev, task); + tag = isci_alloc_tag(ihost); + spin_unlock_irqrestore(&ihost->scic_lock, flags); + + dev_dbg(&ihost->pdev->dev, + "task: %p, dev: %p idev: %p:%#lx cmd = %p\n", + task, task->dev, idev, idev ? idev->flags : 0, + task->uldd_task); + + if (!idev) { + isci_task_refuse(ihost, task, SAS_TASK_UNDELIVERED, + SAS_DEVICE_UNKNOWN); + } else if (!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); + + isci_task_refuse(ihost, task, + SAS_TASK_UNDELIVERED, + SAS_SAM_STAT_TASK_ABORTED); + } else { + struct isci_request *ireq; + + /* 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); + } + + isci_put_device(idev); + return 0; +} + +static struct isci_request *isci_task_request_build(struct isci_host *ihost, + struct isci_remote_device *idev, + u16 tag, struct isci_tmf *isci_tmf) +{ + enum sci_status status = SCI_FAILURE; + struct isci_request *ireq = NULL; + struct domain_device *dev; + + dev_dbg(&ihost->pdev->dev, + "%s: isci_tmf = %p\n", __func__, isci_tmf); + + dev = idev->domain_dev; + + /* do common allocation and init of request object. */ + ireq = isci_tmf_request_from_tag(ihost, isci_tmf, tag); + if (!ireq) + return NULL; + + /* let the core do it's construct. */ + status = sci_task_request_construct(ihost, idev, tag, + ireq); + + if (status != SCI_SUCCESS) { + dev_warn(&ihost->pdev->dev, + "%s: sci_task_request_construct failed - " + "status = 0x%x\n", + __func__, + status); + return NULL; + } + + /* XXX convert to get this from task->tproto like other drivers */ + if (dev->dev_type == SAS_END_DEVICE) { + isci_tmf->proto = SAS_PROTOCOL_SSP; + status = sci_task_request_construct_ssp(ireq); + if (status != SCI_SUCCESS) + return NULL; + } + + return ireq; +} + +static int isci_task_execute_tmf(struct isci_host *ihost, + struct isci_remote_device *idev, + struct isci_tmf *tmf, unsigned long timeout_ms) +{ + DECLARE_COMPLETION_ONSTACK(completion); + enum sci_status status = SCI_FAILURE; + struct isci_request *ireq; + int ret = TMF_RESP_FUNC_FAILED; + unsigned long flags; + unsigned long timeleft; + u16 tag; + + spin_lock_irqsave(&ihost->scic_lock, flags); + tag = isci_alloc_tag(ihost); + spin_unlock_irqrestore(&ihost->scic_lock, flags); + + if (tag == SCI_CONTROLLER_INVALID_IO_TAG) + return ret; + + /* sanity check, return TMF_RESP_FUNC_FAILED + * if the device is not there and ready. + */ + if (!idev || + (!test_bit(IDEV_IO_READY, &idev->flags) && + !test_bit(IDEV_IO_NCQERROR, &idev->flags))) { + dev_dbg(&ihost->pdev->dev, + "%s: idev = %p not ready (%#lx)\n", + __func__, + idev, idev ? idev->flags : 0); + goto err_tci; + } else + dev_dbg(&ihost->pdev->dev, + "%s: idev = %p\n", + __func__, idev); + + /* Assign the pointer to the TMF's completion kernel wait structure. */ + tmf->complete = &completion; + tmf->status = SCI_FAILURE_TIMEOUT; + + ireq = isci_task_request_build(ihost, idev, tag, tmf); + if (!ireq) + goto err_tci; + + spin_lock_irqsave(&ihost->scic_lock, flags); + + /* start the TMF io. */ + status = sci_controller_start_task(ihost, idev, ireq); + + if (status != SCI_SUCCESS) { + dev_dbg(&ihost->pdev->dev, + "%s: start_io failed - status = 0x%x, request = %p\n", + __func__, + status, + ireq); + spin_unlock_irqrestore(&ihost->scic_lock, flags); + goto err_tci; + } + spin_unlock_irqrestore(&ihost->scic_lock, flags); + + /* 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; + else if (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. */ + + dev_dbg(&ihost->pdev->dev, + "%s: completed request = %p\n", + __func__, + ireq); + + return ret; + + err_tci: + spin_lock_irqsave(&ihost->scic_lock, flags); + isci_tci_free(ihost, ISCI_TAG_TCI(tag)); + spin_unlock_irqrestore(&ihost->scic_lock, flags); + + return ret; +} + +static void isci_task_build_tmf(struct isci_tmf *tmf, + enum isci_tmf_function_codes code) +{ + memset(tmf, 0, sizeof(*tmf)); + tmf->tmf_code = code; +} + +static void isci_task_build_abort_task_tmf(struct isci_tmf *tmf, + enum isci_tmf_function_codes code, + struct isci_request *old_request) +{ + isci_task_build_tmf(tmf, code); + tmf->io_tag = old_request->io_tag; +} + +/* + * 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. + */ +static int 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 (ret == TMF_RESP_FUNC_COMPLETE) + dev_dbg(&isci_host->pdev->dev, + "%s: %p: TMF_LU_RESET passed\n", + __func__, isci_device); + else + dev_dbg(&isci_host->pdev->dev, + "%s: %p: TMF_LU_RESET failed (%x)\n", + __func__, isci_device, ret); + + return ret; +} + +int isci_task_lu_reset(struct domain_device *dev, u8 *lun) +{ + struct isci_host *ihost = dev_to_ihost(dev); + struct isci_remote_device *idev; + unsigned long flags; + int ret = TMF_RESP_FUNC_COMPLETE; + + spin_lock_irqsave(&ihost->scic_lock, flags); + idev = isci_get_device(dev->lldd_dev); + spin_unlock_irqrestore(&ihost->scic_lock, flags); + + dev_dbg(&ihost->pdev->dev, + "%s: domain_device=%p, isci_host=%p; isci_device=%p\n", + __func__, dev, ihost, idev); + + 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; + unsigned long 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); + + dev_warn(&ihost->pdev->dev, + "%s: dev = %p (%s%s), task = %p, old_request == %p\n", + __func__, idev, + (dev_is_sata(task->dev) ? "STP/SATA" + : ((dev_is_expander(task->dev->dev_type)) + ? "SMP" + : "SSP")), + ((idev) ? ((test_bit(IDEV_GONE, &idev->flags)) + ? " IDEV_GONE" + : "") + : " <NULL>"), + task, old_request); + + /* 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); + + if (task->task_proto == SAS_PROTOCOL_SMP || + sas_protocol_ata(task->task_proto) || + target_done_already || + test_bit(IDEV_GONE, &idev->flags)) { + + spin_unlock_irqrestore(&ihost->scic_lock, flags); + + /* No task to send, so explicitly resume the device here */ + isci_remote_device_resume_from_abort(ihost, idev); + + dev_warn(&ihost->pdev->dev, + "%s: %s request" + " or complete_in_target (%d), " + "or IDEV_GONE (%d), thus no TMF\n", + __func__, + ((task->task_proto == SAS_PROTOCOL_SMP) + ? "SMP" + : (sas_protocol_ata(task->task_proto) + ? "SATA/STP" + : "<other>") + ), + test_bit(IREQ_COMPLETE_IN_TARGET, + &old_request->flags), + test_bit(IDEV_GONE, &idev->flags)); + + spin_lock_irqsave(&task->task_state_lock, flags); + task->task_state_flags &= ~SAS_TASK_STATE_PENDING; + task->task_state_flags |= SAS_TASK_STATE_DONE; + spin_unlock_irqrestore(&task->task_state_lock, flags); + + ret = TMF_RESP_FUNC_COMPLETE; + } else { + /* Fill in the tmf structure */ + isci_task_build_abort_task_tmf(&tmf, isci_tmf_ssp_task_abort, + old_request); + + spin_unlock_irqrestore(&ihost->scic_lock, flags); + + /* Send the task management request. */ + #define ISCI_ABORT_TASK_TIMEOUT_MS 500 /* 1/2 second timeout */ + ret = isci_task_execute_tmf(ihost, idev, &tmf, + ISCI_ABORT_TASK_TIMEOUT_MS); + } +out: + dev_warn(&ihost->pdev->dev, + "%s: Done; dev = %p, task = %p , old_request == %p\n", + __func__, idev, task, old_request); + isci_put_device(idev); + return ret; +} + +/** + * 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; + + dev_dbg(&ihost->pdev->dev, + "%s: request = %p, status=%d\n", + __func__, ireq, completion_status); + + set_bit(IREQ_COMPLETE_IN_TARGET, &ireq->flags); + + if (tmf) { + tmf->status = completion_status; + + if (tmf->proto == SAS_PROTOCOL_SSP) { + memcpy(tmf->resp.rsp_buf, + ireq->ssp.rsp_buf, + SSP_RESP_IU_MAX_SIZE); + } else if (tmf->proto == SAS_PROTOCOL_SATA) { + memcpy(&tmf->resp.d2h_fis, + &ireq->stp.rsp, + sizeof(struct dev_to_host_fis)); + } + /* PRINT_TMF( ((struct isci_tmf *)request->task)); */ + tmf_complete = tmf->complete; + } + sci_controller_complete_io(ihost, ireq->target_device, ireq); + /* set the 'terminated' flag handle to make sure it cannot be terminated + * or completed again. + */ + set_bit(IREQ_TERMINATED, &ireq->flags); + + if (test_and_clear_bit(IREQ_ABORT_PATH_ACTIVE, &ireq->flags)) + wake_up_all(&ihost->eventq); + + if (!test_bit(IREQ_NO_AUTO_FREE_TAG, &ireq->flags)) + isci_free_tag(ihost, ireq->io_tag); + + /* The task management part completes last. */ + if (tmf_complete) + complete(tmf_complete); +} + +static int isci_reset_device(struct isci_host *ihost, + struct domain_device *dev, + struct isci_remote_device *idev) +{ + int rc = TMF_RESP_FUNC_COMPLETE, reset_stat = -1; + struct sas_phy *phy = sas_get_local_phy(dev); + struct isci_port *iport = dev->port->lldd_port; + + dev_dbg(&ihost->pdev->dev, "%s: idev %p\n", __func__, idev); + + /* 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); + + dev_dbg(&ihost->pdev->dev, "%s: idev %p complete, reset_stat=%d.\n", + __func__, idev, reset_stat); + out: + sas_put_local_phy(phy); + return rc; +} + +int isci_task_I_T_nexus_reset(struct domain_device *dev) +{ + struct isci_host *ihost = dev_to_ihost(dev); + struct isci_remote_device *idev; + unsigned long flags; + int ret; + + spin_lock_irqsave(&ihost->scic_lock, flags); + idev = isci_get_device(dev->lldd_dev); + spin_unlock_irqrestore(&ihost->scic_lock, flags); + + if (!idev) { + /* XXX: need to cleanup any ireqs targeting this + * domain_device + */ + ret = -ENODEV; + goto out; + } + + ret = isci_reset_device(ihost, dev, idev); + out: + isci_put_device(idev); + return ret; +} |