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linux/drivers/scsi/isci/task.c
Dan Williams 7c40a80358 isci: rework timer api 
Prepare the timer api for the arrival of dynamic creation and
destruction events from the core.  It pretended to do this previously
but the core to date only used it in a static init-time only fashion.
This is an interim fix until a cleaner event queue can be developed.

1/ make all locking external to the api (add WARN_ONCE to verify)
2/ add a timer_destroy interface (to be used by the core)
3/ use del_timer_sync() prior to deallocating timer data
4/ delete the "timer_list" indirection, we only have timers allocated
   for the isci_host
5/ fix detection of timer list allocation errors

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 03:55:28 -07:00

1680 lines
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/*
* 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 "scic_task_request.h"
#include "scic_remote_device.h"
#include "scic_io_request.h"
#include "scic_sds_remote_device.h"
#include "scic_sds_remote_node_context.h"
#include "isci.h"
#include "request.h"
#include "sata.h"
#include "task.h"
/**
* 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.
* @num: This parameter specifies the number of tasks to queue.
* @gfp_flags: This parameter specifies the context of this call.
*
* status, zero indicates success.
*/
int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
{
struct isci_host *isci_host;
struct isci_request *request = NULL;
struct isci_remote_device *device;
unsigned long flags;
unsigned long quiesce_flags = 0;
int ret;
enum sci_status status;
dev_dbg(task->dev->port->ha->dev, "%s: num=%d\n", __func__, num);
if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
isci_task_complete_for_upper_layer(
task,
SAS_TASK_UNDELIVERED,
SAM_STAT_TASK_ABORTED,
isci_perform_normal_io_completion
);
return 0; /* The I/O was accepted (and failed). */
}
if ((task->dev == NULL) || (task->dev->port == NULL)) {
/* Indicate SAS_TASK_UNDELIVERED, so that the scsi midlayer
* removes the target.
*/
isci_task_complete_for_upper_layer(
task,
SAS_TASK_UNDELIVERED,
SAS_DEVICE_UNKNOWN,
isci_perform_normal_io_completion
);
return 0; /* The I/O was accepted (and failed). */
}
isci_host = isci_host_from_sas_ha(task->dev->port->ha);
/* Check if we have room for more tasks */
ret = isci_host_can_queue(isci_host, num);
if (ret) {
dev_warn(task->dev->port->ha->dev, "%s: queue full\n", __func__);
return ret;
}
do {
dev_dbg(task->dev->port->ha->dev,
"task = %p, num = %d; dev = %p; cmd = %p\n",
task, num, task->dev, task->uldd_task);
if ((task->dev == NULL) || (task->dev->port == NULL)) {
dev_warn(task->dev->port->ha->dev,
"%s: task %p's port or dev == NULL!\n",
__func__, task);
/* Indicate SAS_TASK_UNDELIVERED, so that the scsi
* midlayer removes the target.
*/
isci_task_complete_for_upper_layer(
task,
SAS_TASK_UNDELIVERED,
SAS_DEVICE_UNKNOWN,
isci_perform_normal_io_completion
);
/* We don't have a valid host reference, so we
* can't control the host queueing condition.
*/
continue;
}
device = isci_dev_from_domain_dev(task->dev);
isci_host = isci_host_from_sas_ha(task->dev->port->ha);
/* check if the controller hasn't started or if the device
* is ready but not accepting IO.
*/
if (device) {
spin_lock_irqsave(&device->host_quiesce_lock,
quiesce_flags);
}
/* From this point onward, any process that needs to guarantee
* that there is no kernel I/O being started will have to wait
* for the quiesce spinlock.
*/
if ((device && ((isci_remote_device_get_state(device) == isci_ready) ||
(isci_remote_device_get_state(device) == isci_host_quiesce)))) {
/* Forces a retry from scsi mid layer. */
dev_warn(task->dev->port->ha->dev,
"%s: task %p: isci_host->status = %d, "
"device = %p\n",
__func__,
task,
isci_host_get_state(isci_host),
device);
if (device)
dev_dbg(task->dev->port->ha->dev,
"%s: device->status = 0x%x\n",
__func__,
isci_remote_device_get_state(device));
/* Indicate QUEUE_FULL so that the scsi midlayer
* retries.
*/
isci_task_complete_for_upper_layer(
task,
SAS_TASK_COMPLETE,
SAS_QUEUE_FULL,
isci_perform_normal_io_completion
);
isci_host_can_dequeue(isci_host, 1);
}
/* the device is going down... */
else if (!device || (isci_ready_for_io != isci_remote_device_get_state(device))) {
dev_dbg(task->dev->port->ha->dev,
"%s: task %p: isci_host->status = %d, "
"device = %p\n",
__func__,
task,
isci_host_get_state(isci_host),
device);
if (device)
dev_dbg(task->dev->port->ha->dev,
"%s: device->status = 0x%x\n",
__func__,
isci_remote_device_get_state(device));
/* Indicate SAS_TASK_UNDELIVERED, so that the scsi
* midlayer removes the target.
*/
isci_task_complete_for_upper_layer(
task,
SAS_TASK_UNDELIVERED,
SAS_DEVICE_UNKNOWN,
isci_perform_normal_io_completion
);
isci_host_can_dequeue(isci_host, 1);
} else {
/* build and send the request. */
status = isci_request_execute(isci_host, task, &request,
gfp_flags);
if (status == SCI_SUCCESS) {
spin_lock_irqsave(&task->task_state_lock, flags);
task->task_state_flags |= SAS_TASK_AT_INITIATOR;
spin_unlock_irqrestore(&task->task_state_lock, flags);
} 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_complete_for_upper_layer(
task,
SAS_TASK_COMPLETE,
SAS_QUEUE_FULL,
isci_perform_normal_io_completion
);
isci_host_can_dequeue(isci_host, 1);
}
}
if (device) {
spin_unlock_irqrestore(&device->host_quiesce_lock,
quiesce_flags
);
}
task = list_entry(task->list.next, struct sas_task, list);
} while (--num > 0);
return 0;
}
/**
* isci_task_request_build() - This function builds the task request object.
* @isci_host: This parameter specifies the ISCI host object
* @request: This parameter points to the isci_request object allocated in the
* request construct function.
* @tmf: This parameter is the task management struct to be built
*
* SCI_SUCCESS on successfull completion, or specific failure code.
*/
static enum sci_status isci_task_request_build(
struct isci_host *isci_host,
struct isci_request **isci_request,
struct isci_tmf *isci_tmf)
{
struct scic_sds_remote_device *sci_device;
enum sci_status status = SCI_FAILURE;
struct isci_request *request;
struct isci_remote_device *isci_device;
/* struct sci_sas_identify_address_frame_protocols dev_protocols; */
struct smp_discover_response_protocols dev_protocols;
dev_dbg(&isci_host->pdev->dev,
"%s: isci_tmf = %p\n", __func__, isci_tmf);
isci_device = isci_tmf->device;
sci_device = isci_device->sci_device_handle;
/* do common allocation and init of request object. */
status = isci_request_alloc_tmf(
isci_host,
isci_tmf,
&request,
isci_device,
GFP_ATOMIC
);
if (status != SCI_SUCCESS)
goto out;
/* let the core do it's construct. */
status = scic_task_request_construct(
isci_host->core_controller,
sci_device,
SCI_CONTROLLER_INVALID_IO_TAG,
request,
request->sci_request_mem_ptr,
&request->sci_request_handle
);
if (status != SCI_SUCCESS) {
dev_warn(&isci_host->pdev->dev,
"%s: scic_task_request_construct failed - "
"status = 0x%x\n",
__func__,
status);
goto errout;
}
sci_object_set_association(
request->sci_request_handle,
request
);
scic_remote_device_get_protocols(
sci_device,
&dev_protocols
);
/* let the core do it's protocol
* specific construction.
*/
if (dev_protocols.u.bits.attached_ssp_target) {
isci_tmf->proto = SAS_PROTOCOL_SSP;
status = scic_task_request_construct_ssp(
request->sci_request_handle
);
if (status != SCI_SUCCESS)
goto errout;
}
if (dev_protocols.u.bits.attached_stp_target) {
isci_tmf->proto = SAS_PROTOCOL_SATA;
status = isci_sata_management_task_request_build(request);
if (status != SCI_SUCCESS)
goto errout;
}
goto out;
errout:
/* release the dma memory if we fail. */
isci_request_free(isci_host, request);
request = NULL;
out:
*isci_request = request;
return status;
}
/**
* isci_tmf_timeout_cb() - This function is called as a kernel callback when
* the timeout period for the TMF has expired.
*
*
*/
static void isci_tmf_timeout_cb(void *tmf_request_arg)
{
struct isci_request *request = (struct isci_request *)tmf_request_arg;
struct isci_tmf *tmf = isci_request_access_tmf(request);
enum sci_status status;
BUG_ON(request->ttype != tmf_task);
/* This task management request has timed-out. Terminate the request
* so that the request eventually completes to the requestor in the
* request completion callback path.
*/
/* Note - the timer callback function itself has provided spinlock
* exclusion from the start and completion paths. No need to take
* the request->isci_host->scic_lock here.
*/
if (tmf->timeout_timer != NULL) {
/* Call the users callback, if any. */
if (tmf->cb_state_func != NULL)
tmf->cb_state_func(isci_tmf_timed_out, tmf,
tmf->cb_data);
/* Terminate the TMF transmit request. */
status = scic_controller_terminate_request(
request->isci_host->core_controller,
request->isci_device->sci_device_handle,
request->sci_request_handle
);
dev_dbg(&request->isci_host->pdev->dev,
"%s: tmf_request = %p; tmf = %p; status = %d\n",
__func__, request, tmf, status);
} else
dev_dbg(&request->isci_host->pdev->dev,
"%s: timer already canceled! "
"tmf_request = %p; tmf = %p\n",
__func__, request, tmf);
/* No need to unlock since the caller to this callback is doing it for
* us.
* request->isci_host->scic_lock
*/
}
/**
* isci_task_execute_tmf() - This function builds and sends a task request,
* then waits for the completion.
* @isci_host: This parameter specifies the ISCI host object
* @tmf: This parameter is the pointer to the task management structure for
* this request.
* @timeout_ms: This parameter specifies the timeout period for the task
* management request.
*
* TMF_RESP_FUNC_COMPLETE on successful completion of the TMF (this includes
* error conditions reported in the IU status), or TMF_RESP_FUNC_FAILED.
*/
int isci_task_execute_tmf(
struct isci_host *isci_host,
struct isci_tmf *tmf,
unsigned long timeout_ms)
{
DECLARE_COMPLETION_ONSTACK(completion);
enum sci_status status = SCI_FAILURE;
struct scic_sds_remote_device *sci_device;
struct isci_remote_device *isci_device = tmf->device;
struct isci_request *request;
int ret = TMF_RESP_FUNC_FAILED;
unsigned long flags;
/* sanity check, return TMF_RESP_FUNC_FAILED
* if the device is not there and ready.
*/
if (!isci_device ||
((isci_ready_for_io != isci_remote_device_get_state(isci_device)) &&
(isci_host_quiesce != isci_remote_device_get_state(isci_device)))) {
dev_dbg(&isci_host->pdev->dev,
"%s: isci_device = %p not ready (%d)\n",
__func__,
isci_device,
isci_remote_device_get_state(isci_device));
return TMF_RESP_FUNC_FAILED;
} else
dev_dbg(&isci_host->pdev->dev,
"%s: isci_device = %p\n",
__func__, isci_device);
sci_device = isci_device->sci_device_handle;
/* Assign the pointer to the TMF's completion kernel wait structure. */
tmf->complete = &completion;
isci_task_request_build(
isci_host,
&request,
tmf
);
if (!request) {
dev_warn(&isci_host->pdev->dev,
"%s: isci_task_request_build failed\n",
__func__);
return TMF_RESP_FUNC_FAILED;
}
/* Allocate the TMF timeout timer. */
spin_lock_irqsave(&isci_host->scic_lock, flags);
tmf->timeout_timer = isci_timer_create(isci_host, request, isci_tmf_timeout_cb);
/* Start the timer. */
if (tmf->timeout_timer)
isci_timer_start(tmf->timeout_timer, timeout_ms);
else
dev_warn(&isci_host->pdev->dev,
"%s: isci_timer_create failed!!!!\n",
__func__);
/* start the TMF io. */
status = scic_controller_start_task(
isci_host->core_controller,
sci_device,
request->sci_request_handle,
SCI_CONTROLLER_INVALID_IO_TAG
);
if (status != SCI_SUCCESS) {
dev_warn(&isci_host->pdev->dev,
"%s: start_io failed - status = 0x%x, request = %p\n",
__func__,
status,
request);
goto cleanup_request;
}
/* Call the users callback, if any. */
if (tmf->cb_state_func != NULL)
tmf->cb_state_func(isci_tmf_started, tmf, tmf->cb_data);
/* Change the state of the TMF-bearing request to "started". */
isci_request_change_state(request, started);
/* add the request to the remote device request list. */
list_add(&request->dev_node, &isci_device->reqs_in_process);
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
/* Wait for the TMF to complete, or a timeout. */
wait_for_completion(&completion);
isci_print_tmf(tmf);
if (tmf->status == SCI_SUCCESS)
ret = TMF_RESP_FUNC_COMPLETE;
else if (tmf->status == SCI_FAILURE_IO_RESPONSE_VALID) {
dev_dbg(&isci_host->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(&isci_host->pdev->dev,
"%s: completed request = %p\n",
__func__,
request);
if (request->io_request_completion != NULL) {
/* The fact that this is non-NULL for a TMF request
* means there is a thread waiting for this TMF to
* finish.
*/
complete(request->io_request_completion);
}
spin_lock_irqsave(&isci_host->scic_lock, flags);
cleanup_request:
/* Clean up the timer if needed. */
if (tmf->timeout_timer) {
isci_del_timer(isci_host, tmf->timeout_timer);
tmf->timeout_timer = NULL;
}
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
isci_request_free(isci_host, request);
return ret;
}
void isci_task_build_tmf(
struct isci_tmf *tmf,
struct isci_remote_device *isci_device,
enum isci_tmf_function_codes code,
void (*tmf_sent_cb)(enum isci_tmf_cb_state,
struct isci_tmf *,
void *),
void *cb_data)
{
dev_dbg(&isci_device->isci_port->isci_host->pdev->dev,
"%s: isci_device = %p\n", __func__, isci_device);
memset(tmf, 0, sizeof(*tmf));
tmf->device = isci_device;
tmf->tmf_code = code;
tmf->timeout_timer = NULL;
tmf->cb_state_func = tmf_sent_cb;
tmf->cb_data = cb_data;
}
static struct isci_request *isci_task_get_request_from_task(
struct sas_task *task,
struct isci_host **isci_host,
struct isci_remote_device **isci_device)
{
struct isci_request *request = NULL;
unsigned long flags;
spin_lock_irqsave(&task->task_state_lock, flags);
request = task->lldd_task;
/* If task is already done, the request isn't valid */
if (!(task->task_state_flags & SAS_TASK_STATE_DONE) &&
(task->task_state_flags & SAS_TASK_AT_INITIATOR) &&
(request != NULL)) {
if (isci_host != NULL)
*isci_host = request->isci_host;
if (isci_device != NULL)
*isci_device = request->isci_device;
}
spin_unlock_irqrestore(&task->task_state_lock, flags);
return request;
}
/**
* isci_task_validate_request_to_abort() - This function checks the given I/O
* against the "started" state. If the request is still "started", it's
* state is changed to aborted. NOTE: isci_host->scic_lock MUST BE HELD
* BEFORE CALLING THIS FUNCTION.
* @isci_request: This parameter specifies the request object to control.
* @isci_host: This parameter specifies the ISCI host object
* @isci_device: This is the device to which the request is pending.
* @aborted_io_completion: This is a completion structure that will be added to
* the request in case it is changed to aborting; this completion is
* triggered when the request is fully completed.
*
* Either "started" on successful change of the task status to "aborted", or
* "unallocated" if the task cannot be controlled.
*/
static enum isci_request_status isci_task_validate_request_to_abort(
struct isci_request *isci_request,
struct isci_host *isci_host,
struct isci_remote_device *isci_device,
struct completion *aborted_io_completion)
{
enum isci_request_status old_state = unallocated;
/* Only abort the task if it's in the
* device's request_in_process list
*/
if (isci_request && !list_empty(&isci_request->dev_node)) {
old_state = isci_request_change_started_to_aborted(
isci_request, aborted_io_completion);
/* Only abort requests in the started state. */
if (old_state != started)
old_state = unallocated;
}
return old_state;
}
static void isci_request_cleanup_completed_loiterer(
struct isci_host *isci_host,
struct isci_remote_device *isci_device,
struct isci_request *isci_request)
{
struct sas_task *task = isci_request_access_task(isci_request);
unsigned long flags;
dev_dbg(&isci_host->pdev->dev,
"%s: isci_device=%p, request=%p, task=%p\n",
__func__, isci_device, isci_request,
isci_request->ttype_ptr.io_task_ptr);
spin_lock_irqsave(&isci_host->scic_lock, flags);
list_del_init(&isci_request->dev_node);
if (task != NULL)
task->lldd_task = NULL;
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
isci_request_free(isci_host, isci_request);
}
/**
* isci_terminate_request_core() - This function will terminate the given
* request, and wait for it to complete. This function must only be called
* from a thread that can wait. Note that the request is terminated and
* completed (back to the host, if started there).
* @isci_host: This SCU.
* @isci_device: The target.
* @isci_request: The I/O request to be terminated.
*
*
*/
static void isci_terminate_request_core(
struct isci_host *isci_host,
struct isci_remote_device *isci_device,
struct isci_request *isci_request,
struct completion *request_completion)
{
enum sci_status status = SCI_SUCCESS;
bool was_terminated = false;
bool needs_cleanup_handling = false;
enum isci_request_status request_status;
unsigned long flags;
dev_dbg(&isci_host->pdev->dev,
"%s: device = %p; request = %p\n",
__func__, isci_device, isci_request);
/* Peek at the current status of the request. This will tell
* us if there was special handling on the request such that it
* needs to be detached and freed here.
*/
spin_lock_irqsave(&isci_request->state_lock, flags);
request_status = isci_request_get_state(isci_request);
/* TMFs are in their own thread */
if ((isci_request->ttype == io_task) &&
((request_status == aborted) ||
(request_status == aborting) ||
(request_status == terminating)))
/* The completion routine won't free a request in
* the aborted/aborting/terminating state, so we do
* it here.
*/
needs_cleanup_handling = true;
spin_unlock_irqrestore(&isci_request->state_lock, flags);
spin_lock_irqsave(&isci_host->scic_lock, flags);
/* Make sure the request wasn't just sitting around signalling
* device condition (if the request handle is NULL, then the
* request completed but needed additional handling here).
*/
if (isci_request->sci_request_handle != NULL) {
was_terminated = true;
status = scic_controller_terminate_request(
isci_host->core_controller,
isci_device->sci_device_handle,
isci_request->sci_request_handle
);
}
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
/*
* The only time the request to terminate will
* fail is when the io request is completed and
* being aborted.
*/
if (status != SCI_SUCCESS)
dev_err(&isci_host->pdev->dev,
"%s: scic_controller_terminate_request"
" returned = 0x%x\n",
__func__,
status);
else {
if (was_terminated) {
dev_dbg(&isci_host->pdev->dev,
"%s: before completion wait (%p)\n",
__func__,
request_completion);
/* Wait here for the request to complete. */
wait_for_completion(request_completion);
dev_dbg(&isci_host->pdev->dev,
"%s: after completion wait (%p)\n",
__func__,
request_completion);
}
if (needs_cleanup_handling)
isci_request_cleanup_completed_loiterer(
isci_host, isci_device, isci_request
);
}
}
static void isci_terminate_request(
struct isci_host *isci_host,
struct isci_remote_device *isci_device,
struct isci_request *isci_request,
enum isci_request_status new_request_state)
{
enum isci_request_status old_state;
DECLARE_COMPLETION_ONSTACK(request_completion);
unsigned long flags;
spin_lock_irqsave(&isci_host->scic_lock, flags);
/* Change state to "new_request_state" if it is currently "started" */
old_state = isci_request_change_started_to_newstate(
isci_request,
&request_completion,
new_request_state
);
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
if (old_state == started)
/* This request was not already being aborted. If it had been,
* then the aborting I/O (ie. the TMF request) would not be in
* the aborting state, and thus would be terminated here. Note
* that since the TMF completion's call to the kernel function
* "complete()" does not happen until the pending I/O request
* terminate fully completes, we do not have to implement a
* special wait here for already aborting requests - the
* termination of the TMF request will force the request
* to finish it's already started terminate.
*/
isci_terminate_request_core(isci_host, isci_device,
isci_request, &request_completion);
}
/**
* isci_terminate_pending_requests() - This function will change the all of the
* requests on the given device's state to "aborting", will terminate the
* requests, and wait for them to complete. This function must only be
* called from a thread that can wait. Note that the requests are all
* terminated and completed (back to the host, if started there).
* @isci_host: This parameter specifies SCU.
* @isci_device: This parameter specifies the target.
*
*
*/
void isci_terminate_pending_requests(
struct isci_host *isci_host,
struct isci_remote_device *isci_device,
enum isci_request_status new_request_state)
{
struct isci_request *isci_request;
struct sas_task *task;
bool done = false;
unsigned long flags;
dev_dbg(&isci_host->pdev->dev,
"%s: isci_device = %p (new request state = %d)\n",
__func__, isci_device, new_request_state);
#define ISCI_TERMINATE_SHOW_PENDING_REQUESTS
#ifdef ISCI_TERMINATE_SHOW_PENDING_REQUESTS
{
struct isci_request *request;
/* Only abort the task if it's in the
* device's request_in_process list
*/
list_for_each_entry(request,
&isci_device->reqs_in_process,
dev_node)
dev_dbg(&isci_host->pdev->dev,
"%s: isci_device = %p; request is on "
"reqs_in_process list: %p\n",
__func__, isci_device, request);
}
#endif /* ISCI_TERMINATE_SHOW_PENDING_REQUESTS */
/* Clean up all pending requests. */
do {
spin_lock_irqsave(&isci_host->scic_lock, flags);
if (list_empty(&isci_device->reqs_in_process)) {
done = true;
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
dev_dbg(&isci_host->pdev->dev,
"%s: isci_device = %p; done.\n",
__func__, isci_device);
} else {
/* The list was not empty - grab the first request. */
isci_request = list_first_entry(
&isci_device->reqs_in_process,
struct isci_request, dev_node
);
/* Note that we are not expecting to have to control
* the target to abort the request.
*/
isci_request->complete_in_target = true;
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
/* Get the libsas task reference. */
task = isci_request_access_task(isci_request);
dev_dbg(&isci_host->pdev->dev,
"%s: isci_device=%p request=%p; task=%p\n",
__func__, isci_device, isci_request, task);
/* Mark all still pending I/O with the selected next
* state.
*/
isci_terminate_request(isci_host, isci_device,
isci_request, new_request_state
);
/* Set the 'done' state on the task. */
if (task)
isci_task_all_done(task);
}
} while (!done);
}
/**
* 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_device, isci_tmf_ssp_lun_reset, NULL,
NULL);
#define ISCI_LU_RESET_TIMEOUT_MS 2000 /* 2 second timeout. */
ret = isci_task_execute_tmf(isci_host, &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;
}
/**
* isci_task_lu_reset() - This function is one of the SAS Domain Template
* functions. This is one of the Task Management functoins called by libsas,
* to reset the given lun. Note the assumption that while this call is
* executing, no I/O will be sent by the host to the device.
* @lun: This parameter specifies the lun to be reset.
*
* status, zero indicates success.
*/
int isci_task_lu_reset(
struct domain_device *domain_device,
u8 *lun)
{
struct isci_host *isci_host = NULL;
struct isci_remote_device *isci_device = NULL;
int ret;
bool device_stopping = false;
if (domain_device == NULL) {
pr_warn("%s: domain_device == NULL\n", __func__);
return TMF_RESP_FUNC_FAILED;
}
isci_device = isci_dev_from_domain_dev(domain_device);
if (domain_device->port != NULL)
isci_host = isci_host_from_sas_ha(domain_device->port->ha);
pr_debug("%s: domain_device=%p, isci_host=%p; isci_device=%p\n",
__func__, domain_device, isci_host, isci_device);
if (isci_device != NULL)
device_stopping = (isci_device->status == isci_stopping)
|| (isci_device->status == isci_stopped);
/* If there is a device reset pending on any request in the
* device's list, fail this LUN reset request in order to
* escalate to the device reset.
*/
if ((isci_device == NULL) ||
(isci_host == NULL) ||
((isci_host != NULL) &&
(isci_device != NULL) &&
(device_stopping ||
(isci_device_is_reset_pending(isci_host, isci_device))))) {
dev_warn(&isci_host->pdev->dev,
"%s: No dev (%p), no host (%p), or "
"RESET PENDING: domain_device=%p\n",
__func__, isci_device, isci_host, domain_device);
return TMF_RESP_FUNC_FAILED;
}
/* Stop I/O to the remote device. */
isci_device_set_host_quiesce_lock_state(isci_device, true);
/* Send the task management part of the reset. */
if (sas_protocol_ata(domain_device->tproto)) {
ret = isci_task_send_lu_reset_sata(
isci_host, isci_device, lun
);
} else
ret = isci_task_send_lu_reset_sas(isci_host, isci_device, lun);
/* If the LUN reset worked, all the I/O can now be terminated. */
if (ret == TMF_RESP_FUNC_COMPLETE)
/* Terminate all I/O now. */
isci_terminate_pending_requests(isci_host,
isci_device,
terminating);
/* Resume I/O to the remote device. */
isci_device_set_host_quiesce_lock_state(isci_device, false);
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;
}
int isci_task_I_T_nexus_reset(struct domain_device *dev)
{
return TMF_RESP_FUNC_FAILED;
}
/* Task Management Functions. Must be called from process context. */
/**
* isci_abort_task_process_cb() - This is a helper function for the abort task
* TMF command. It manages the request state with respect to the successful
* transmission / completion of the abort task request.
* @cb_state: This parameter specifies when this function was called - after
* the TMF request has been started and after it has timed-out.
* @tmf: This parameter specifies the TMF in progress.
*
*
*/
static void isci_abort_task_process_cb(
enum isci_tmf_cb_state cb_state,
struct isci_tmf *tmf,
void *cb_data)
{
struct isci_request *old_request;
old_request = (struct isci_request *)cb_data;
dev_dbg(&old_request->isci_host->pdev->dev,
"%s: tmf=%p, old_request=%p\n",
__func__, tmf, old_request);
switch (cb_state) {
case isci_tmf_started:
/* The TMF has been started. Nothing to do here, since the
* request state was already set to "aborted" by the abort
* task function.
*/
BUG_ON(old_request->status != aborted);
break;
case isci_tmf_timed_out:
/* Set the task's state to "aborting", since the abort task
* function thread set it to "aborted" (above) in anticipation
* of the task management request working correctly. Since the
* timeout has now fired, the TMF request failed. We set the
* state such that the request completion will indicate the
* device is no longer present.
*/
isci_request_change_state(old_request, aborting);
break;
default:
dev_err(&old_request->isci_host->pdev->dev,
"%s: Bad cb_state (%d): tmf=%p, old_request=%p\n",
__func__, cb_state, tmf, old_request);
break;
}
}
/**
* 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)
{
DECLARE_COMPLETION_ONSTACK(aborted_io_completion);
struct isci_request *old_request = NULL;
struct isci_remote_device *isci_device = NULL;
struct isci_host *isci_host = NULL;
struct isci_tmf tmf;
int ret = TMF_RESP_FUNC_FAILED;
unsigned long flags;
bool any_dev_reset, device_stopping;
/* 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.
*/
old_request = isci_task_get_request_from_task(task, &isci_host,
&isci_device);
dev_dbg(&isci_host->pdev->dev,
"%s: task = %p\n", __func__, task);
/* Check if the device has been / is currently being removed.
* If so, no task management will be done, and the I/O will
* be terminated.
*/
device_stopping = (isci_device->status == isci_stopping)
|| (isci_device->status == isci_stopped);
#ifdef NOMORE
/* This abort task function is the first stop of the libsas error
* handler thread. Since libsas is executing in a thread with a
* referernce to the "task" parameter, that task cannot be completed
* directly back to the upper layers. In order to make sure that
* the task is managed correctly if this abort task fails, set the
* "SAS_TASK_STATE_ABORTED" bit now such that completions up the
* stack will be intercepted and only allowed to happen in the
* libsas SCSI error handler thread.
*/
spin_lock_irqsave(&task->task_state_lock, flags);
task->task_state_flags |= SAS_TASK_STATE_ABORTED;
spin_unlock_irqrestore(&task->task_state_lock, flags);
#endif /* NOMORE */
/* This version of the driver will fail abort requests for
* SATA/STP. Failing the abort request this way will cause the
* SCSI error handler thread to escalate to LUN reset
*/
if (sas_protocol_ata(task->task_proto) && !device_stopping) {
dev_warn(&isci_host->pdev->dev,
" task %p is for a STP/SATA device;"
" returning TMF_RESP_FUNC_FAILED\n"
" to cause a LUN reset...\n", task);
return TMF_RESP_FUNC_FAILED;
}
dev_dbg(&isci_host->pdev->dev,
"%s: old_request == %p\n", __func__, old_request);
spin_lock_irqsave(&task->task_state_lock, flags);
/* Don't do resets to stopping devices. */
if (device_stopping)
task->task_state_flags &= ~SAS_TASK_NEED_DEV_RESET;
/* See if there is a pending device reset for this device. */
any_dev_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
spin_unlock_irqrestore(&task->task_state_lock, flags);
if ((isci_device != NULL) && !device_stopping)
any_dev_reset = any_dev_reset
|| isci_device_is_reset_pending(isci_host,
isci_device
);
/* If the extraction of the request reference from the task
* failed, then the request has been completed (or if there is a
* pending reset then this abort request function must be failed
* in order to escalate to the target reset).
*/
if ((old_request == NULL) ||
((old_request != NULL) &&
(old_request->sci_request_handle == NULL) &&
(old_request->complete_in_target)) ||
any_dev_reset) {
spin_lock_irqsave(&task->task_state_lock, flags);
/* If the device reset task flag is set, fail the task
* management request. Otherwise, the original request
* has completed.
*/
if (any_dev_reset) {
/* Turn off the task's DONE to make sure this
* task is escalated to a target reset.
*/
task->task_state_flags &= ~SAS_TASK_STATE_DONE;
/* Fail the task management request in order to
* escalate to the target reset.
*/
ret = TMF_RESP_FUNC_FAILED;
dev_dbg(&isci_host->pdev->dev,
"%s: Failing task abort in order to "
"escalate to target reset because\n"
"SAS_TASK_NEED_DEV_RESET is set for "
"task %p on dev %p\n",
__func__, task, isci_device);
} else {
ret = TMF_RESP_FUNC_COMPLETE;
dev_dbg(&isci_host->pdev->dev,
"%s: abort task not needed for %p\n",
__func__, task);
/* 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 sucessful.
*/
isci_set_task_doneflags(task);
/* Set the abort bit to make sure that libsas sticks the
* task in the completed task queue.
*/
/* task->task_state_flags |= SAS_TASK_STATE_ABORTED; */
/* Check for the situation where the request was
* left around on the device list but the
* request already completed.
*/
if (old_request && !old_request->sci_request_handle) {
isci_request_cleanup_completed_loiterer(
isci_host, isci_device, old_request
);
}
}
spin_unlock_irqrestore(&task->task_state_lock, flags);
return ret;
}
spin_lock_irqsave(&isci_host->scic_lock, flags);
/* Sanity check the request status, and set the I/O kernel completion
* struct that will be triggered when the request completes.
*/
if (isci_task_validate_request_to_abort(
old_request,
isci_host,
isci_device,
&aborted_io_completion)
== unallocated) {
dev_dbg(&isci_host->pdev->dev,
"%s: old_request not valid for device = %p\n",
__func__,
isci_device);
old_request = NULL;
}
if (!old_request) {
/* There is no isci_request attached to the sas_task.
* It must have been completed and detached.
*/
dev_dbg(&isci_host->pdev->dev,
"%s: old_request == NULL\n",
__func__);
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
/* Set the state on the task. */
isci_task_all_done(task);
return TMF_RESP_FUNC_COMPLETE;
}
if (task->task_proto == SAS_PROTOCOL_SMP || device_stopping) {
if (device_stopping)
dev_dbg(&isci_host->pdev->dev,
"%s: device is stopping, thus no TMF\n",
__func__);
else
dev_dbg(&isci_host->pdev->dev,
"%s: request is SMP, thus no TMF\n",
__func__);
old_request->complete_in_target = true;
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
/* Set the state on the task. */
isci_task_all_done(task);
ret = TMF_RESP_FUNC_COMPLETE;
/* Stopping and SMP devices are not sent a TMF, and are not
* reset, but the outstanding I/O request is terminated here.
*
* Clean up the request on our side, and wait for the aborted
* I/O to complete.
*/
isci_terminate_request_core(isci_host, isci_device, old_request,
&aborted_io_completion);
} else {
/* Fill in the tmf stucture */
isci_task_build_tmf(&tmf, isci_device, isci_tmf_ssp_task_abort,
isci_abort_task_process_cb, old_request);
tmf.io_tag = scic_io_request_get_io_tag(
old_request->sci_request_handle
);
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
#define ISCI_ABORT_TASK_TIMEOUT_MS 500 /* half second timeout. */
ret = isci_task_execute_tmf(isci_host, &tmf,
ISCI_ABORT_TASK_TIMEOUT_MS);
if (ret == TMF_RESP_FUNC_COMPLETE) {
old_request->complete_in_target = true;
/* Clean up the request on our side, and wait for the aborted I/O to
* complete.
*/
isci_terminate_request_core(isci_host, isci_device, old_request,
&aborted_io_completion);
/* Set the state on the task. */
isci_task_all_done(task);
} else
dev_err(&isci_host->pdev->dev,
"%s: isci_task_send_tmf failed\n",
__func__);
}
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_aca() - 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_aca(
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.
* @lun: This parameter specifies the lun associated with this request.
*
* 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.
* @isci_host: This parameter specifies the ISCI host object
* @request: 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 *isci_host,
struct isci_request *request,
enum sci_task_status completion_status)
{
struct isci_remote_device *isci_device = request->isci_device;
enum isci_request_status old_state;
struct isci_tmf *tmf = isci_request_access_tmf(request);
struct completion *tmf_complete;
dev_dbg(&isci_host->pdev->dev,
"%s: request = %p, status=%d\n",
__func__, request, completion_status);
old_state = isci_request_change_state(request, completed);
tmf->status = completion_status;
request->complete_in_target = true;
if (SAS_PROTOCOL_SSP == tmf->proto) {
memcpy(&tmf->resp.resp_iu,
scic_io_request_get_response_iu_address(
request->sci_request_handle
),
sizeof(struct sci_ssp_response_iu));
} else if (SAS_PROTOCOL_SATA == tmf->proto) {
memcpy(&tmf->resp.d2h_fis,
scic_stp_io_request_get_d2h_reg_address(
request->sci_request_handle
),
sizeof(struct sata_fis_reg_d2h)
);
}
/* Manage the timer if it is still running. */
if (tmf->timeout_timer) {
isci_del_timer(isci_host, tmf->timeout_timer);
tmf->timeout_timer = NULL;
}
/* PRINT_TMF( ((struct isci_tmf *)request->task)); */
tmf_complete = tmf->complete;
scic_controller_complete_task(
isci_host->core_controller,
isci_device->sci_device_handle,
request->sci_request_handle
);
/* NULL the request handle to make sure it cannot be terminated
* or completed again.
*/
request->sci_request_handle = NULL;
isci_request_change_state(request, unallocated);
list_del_init(&request->dev_node);
/* The task management part completes last. */
complete(tmf_complete);
}
/**
* isci_task_ssp_request_get_lun() - This function is called by the sci core to
* retrieve the lun for a given task request.
* @request: This parameter is the isci_request object.
*
* lun for specified task request.
*/
u32 isci_task_ssp_request_get_lun(struct isci_request *request)
{
struct isci_tmf *isci_tmf = isci_request_access_tmf(request);
dev_dbg(&request->isci_host->pdev->dev,
"%s: lun = %d\n", __func__, isci_tmf->lun[0]);
/* @todo: build lun from array of bytes to 32 bit */
return isci_tmf->lun[0];
}
/**
* isci_task_ssp_request_get_function() - This function is called by the sci
* core to retrieve the function for a given task request.
* @request: This parameter is the isci_request object.
*
* function code for specified task request.
*/
u8 isci_task_ssp_request_get_function(struct isci_request *request)
{
struct isci_tmf *isci_tmf = isci_request_access_tmf(request);
dev_dbg(&request->isci_host->pdev->dev,
"%s: func = %d\n", __func__, isci_tmf->tmf_code);
return isci_tmf->tmf_code;
}
/**
* isci_task_ssp_request_get_io_tag_to_manage() - This function is called by
* the sci core to retrieve the io tag for a given task request.
* @request: This parameter is the isci_request object.
*
* io tag for specified task request.
*/
u16 isci_task_ssp_request_get_io_tag_to_manage(struct isci_request *request)
{
u16 io_tag = SCI_CONTROLLER_INVALID_IO_TAG;
if (tmf_task == request->ttype) {
struct isci_tmf *tmf = isci_request_access_tmf(request);
io_tag = tmf->io_tag;
}
dev_dbg(&request->isci_host->pdev->dev,
"%s: request = %p, io_tag = %d\n",
__func__, request, io_tag);
return io_tag;
}
/**
* isci_task_ssp_request_get_response_data_address() - This function is called
* by the sci core to retrieve the response data address for a given task
* request.
* @request: This parameter is the isci_request object.
*
* response data address for specified task request.
*/
void *isci_task_ssp_request_get_response_data_address(
struct isci_request *request)
{
struct isci_tmf *isci_tmf = isci_request_access_tmf(request);
return &isci_tmf->resp.resp_iu;
}
/**
* isci_task_ssp_request_get_response_data_length() - This function is called
* by the sci core to retrieve the response data length for a given task
* request.
* @request: This parameter is the isci_request object.
*
* response data length for specified task request.
*/
u32 isci_task_ssp_request_get_response_data_length(
struct isci_request *request)
{
struct isci_tmf *isci_tmf = isci_request_access_tmf(request);
return sizeof(isci_tmf->resp.resp_iu);
}
/**
* isci_bus_reset_handler() - This function performs a target reset of the
* device referenced by "cmd'. This function is exported through the
* "struct scsi_host_template" structure such that it is called when an I/O
* recovery process has escalated to a target reset. Note that this function
* is called from the scsi error handler event thread, so may block on calls.
* @scsi_cmd: This parameter specifies the target to be reset.
*
* SUCCESS if the reset process was successful, else FAILED.
*/
int isci_bus_reset_handler(struct scsi_cmnd *cmd)
{
unsigned long flags = 0;
struct isci_host *isci_host = NULL;
enum sci_status status;
int base_status;
struct isci_remote_device *isci_dev
= isci_dev_from_domain_dev(
sdev_to_domain_dev(cmd->device));
dev_dbg(&cmd->device->sdev_gendev,
"%s: cmd %p, isci_dev %p\n",
__func__, cmd, isci_dev);
if (!isci_dev) {
dev_warn(&cmd->device->sdev_gendev,
"%s: isci_dev is GONE!\n",
__func__);
return TMF_RESP_FUNC_COMPLETE; /* Nothing to reset. */
}
if (isci_dev->isci_port != NULL)
isci_host = isci_dev->isci_port->isci_host;
if (isci_host != NULL)
spin_lock_irqsave(&isci_host->scic_lock, flags);
status = scic_remote_device_reset(isci_dev->sci_device_handle);
if (status != SCI_SUCCESS) {
if (isci_host != NULL)
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
scmd_printk(KERN_WARNING, cmd,
"%s: scic_remote_device_reset(%p) returned %d!\n",
__func__, isci_dev, status);
return TMF_RESP_FUNC_FAILED;
}
if (isci_host != NULL)
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
/* Stop I/O to the remote device. */
isci_device_set_host_quiesce_lock_state(isci_dev, true);
/* Make sure all pending requests are able to be fully terminated. */
isci_device_clear_reset_pending(isci_dev);
/* Terminate in-progress I/O now. */
isci_remote_device_nuke_requests(isci_dev);
/* Call into the libsas default handler (which calls sas_phy_reset). */
base_status = sas_eh_bus_reset_handler(cmd);
if (base_status != SUCCESS) {
/* There can be cases where the resets to individual devices
* behind an expander will fail because of an unplug of the
* expander itself.
*/
scmd_printk(KERN_WARNING, cmd,
"%s: sas_eh_bus_reset_handler(%p) returned %d!\n",
__func__, cmd, base_status);
}
/* WHAT TO DO HERE IF sas_phy_reset FAILS? */
if (isci_host != NULL)
spin_lock_irqsave(&isci_host->scic_lock, flags);
status
= scic_remote_device_reset_complete(isci_dev->sci_device_handle);
if (isci_host != NULL)
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
if (status != SCI_SUCCESS) {
scmd_printk(KERN_WARNING, cmd,
"%s: scic_remote_device_reset_complete(%p) "
"returned %d!\n",
__func__, isci_dev, status);
}
/* WHAT TO DO HERE IF scic_remote_device_reset_complete FAILS? */
dev_dbg(&cmd->device->sdev_gendev,
"%s: cmd %p, isci_dev %p complete.\n",
__func__, cmd, isci_dev);
/* Resume I/O to the remote device. */
isci_device_set_host_quiesce_lock_state(isci_dev, false);
return TMF_RESP_FUNC_COMPLETE;
}
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