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linux-sg2042/drivers/scsi/isci/task.c

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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 <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)
{
enum isci_completion_selection disposition;
disposition = isci_perform_normal_io_completion;
disposition = isci_task_set_completion_status(task, response, status,
disposition);
/* Tasks aborted specifically by a call to the lldd_abort_task
* function should not be completed to the host in the regular path.
*/
switch (disposition) {
case isci_perform_normal_io_completion:
/* Normal notification (task_done) */
dev_dbg(&ihost->pdev->dev,
"%s: Normal - task = %p, response=%d, "
"status=%d\n",
__func__, task, response, status);
task->lldd_task = NULL;
isci_execpath_callback(ihost, task, task->task_done);
break;
case isci_perform_aborted_io_completion:
/*
* No notification because this request is already in the
* abort path.
*/
dev_dbg(&ihost->pdev->dev,
"%s: Aborted - task = %p, response=%d, "
"status=%d\n",
__func__, task, response, status);
break;
case isci_perform_error_io_completion:
/* Use sas_task_abort */
dev_dbg(&ihost->pdev->dev,
"%s: Error - task = %p, response=%d, "
"status=%d\n",
__func__, task, response, status);
isci_execpath_callback(ihost, task, sas_task_abort);
break;
default:
dev_dbg(&ihost->pdev->dev,
"%s: isci task notification default case!",
__func__);
sas_task_abort(task);
break;
}
}
#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.
* @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 *ihost = dev_to_ihost(task->dev);
struct isci_remote_device *idev;
unsigned long flags;
bool io_ready;
u16 tag;
dev_dbg(&ihost->pdev->dev, "%s: num=%d\n", __func__, num);
for_each_sas_task(num, task) {
enum sci_status status = SCI_FAILURE;
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, num: %d dev: %p idev: %p:%#lx cmd = %p\n",
task, num, 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,
SAM_STAT_TASK_ABORTED);
} else {
task->task_state_flags |= SAS_TASK_AT_INITIATOR;
spin_unlock_irqrestore(&task->task_state_lock, flags);
/* build and send the request. */
status = isci_request_execute(ihost, idev, task, tag);
if (status != SCI_SUCCESS) {
spin_lock_irqsave(&task->task_state_lock, flags);
/* Did not really start this command. */
task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
spin_unlock_irqrestore(&task->task_state_lock, flags);
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 enum sci_status isci_sata_management_task_request_build(struct isci_request *ireq)
{
struct isci_tmf *isci_tmf;
enum sci_status status;
if (!test_bit(IREQ_TMF, &ireq->flags))
return SCI_FAILURE;
isci_tmf = isci_request_access_tmf(ireq);
switch (isci_tmf->tmf_code) {
case isci_tmf_sata_srst_high:
case isci_tmf_sata_srst_low: {
struct host_to_dev_fis *fis = &ireq->stp.cmd;
memset(fis, 0, sizeof(*fis));
fis->fis_type = 0x27;
fis->flags &= ~0x80;
fis->flags &= 0xF0;
if (isci_tmf->tmf_code == isci_tmf_sata_srst_high)
fis->control |= ATA_SRST;
else
fis->control &= ~ATA_SRST;
break;
}
/* other management commnd go here... */
default:
return SCI_FAILURE;
}
/* core builds the protocol specific request
* based on the h2d fis.
*/
status = sci_task_request_construct_sata(ireq);
return status;
}
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_DEV) {
isci_tmf->proto = SAS_PROTOCOL_SSP;
status = sci_task_request_construct_ssp(ireq);
if (status != SCI_SUCCESS)
return NULL;
}
if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) {
isci_tmf->proto = SAS_PROTOCOL_SATA;
status = isci_sata_management_task_request_build(ireq);
if (status != SCI_SUCCESS)
return NULL;
}
return ireq;
}
/**
* isci_request_mark_zombie() - This function must be called with scic_lock held.
*/
static void isci_request_mark_zombie(struct isci_host *ihost, struct isci_request *ireq)
{
struct completion *tmf_completion = NULL;
struct completion *req_completion;
/* Set the request state to "dead". */
ireq->status = dead;
req_completion = ireq->io_request_completion;
ireq->io_request_completion = NULL;
if (test_bit(IREQ_TMF, &ireq->flags)) {
/* Break links with the TMF request. */
struct isci_tmf *tmf = isci_request_access_tmf(ireq);
/* In the case where a task request is dying,
* the thread waiting on the complete will sit and
* timeout unless we wake it now. Since the TMF
* has a default error status, complete it here
* to wake the waiting thread.
*/
if (tmf) {
tmf_completion = tmf->complete;
tmf->complete = NULL;
}
ireq->ttype_ptr.tmf_task_ptr = NULL;
dev_dbg(&ihost->pdev->dev, "%s: tmf_code %d, managed tag %#x\n",
__func__, tmf->tmf_code, tmf->io_tag);
} else {
/* Break links with the sas_task - the callback is done
* elsewhere.
*/
struct sas_task *task = isci_request_access_task(ireq);
if (task)
task->lldd_task = NULL;
ireq->ttype_ptr.io_task_ptr = NULL;
}
dev_warn(&ihost->pdev->dev, "task context unrecoverable (tag: %#x)\n",
ireq->io_tag);
/* Don't force waiting threads to timeout. */
if (req_completion)
complete(req_completion);
if (tmf_completion != NULL)
complete(tmf_completion);
}
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_task_status status = SCI_TASK_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_TASK_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;
}
if (tmf->cb_state_func != NULL)
tmf->cb_state_func(isci_tmf_started, tmf, tmf->cb_data);
isci_request_change_state(ireq, started);
/* add the request to the remote device request list. */
list_add(&ireq->dev_node, &idev->reqs_in_process);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
/* 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.
*/
spin_lock_irqsave(&ihost->scic_lock, flags);
if (tmf->cb_state_func != NULL)
tmf->cb_state_func(isci_tmf_timed_out, tmf,
tmf->cb_data);
sci_controller_terminate_request(ihost, idev, ireq);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
timeleft = wait_for_completion_timeout(
&completion,
msecs_to_jiffies(ISCI_TERMINATION_TIMEOUT_MSEC));
if (!timeleft) {
/* Strange condition - the termination of the TMF
* request timed-out.
*/
spin_lock_irqsave(&ihost->scic_lock, flags);
/* If the TMF status has not changed, kill it. */
if (tmf->status == SCI_FAILURE_TIMEOUT)
isci_request_mark_zombie(ihost, ireq);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
}
}
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(&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,
void (*tmf_sent_cb)(enum isci_tmf_cb_state,
struct isci_tmf *,
void *),
void *cb_data)
{
memset(tmf, 0, sizeof(*tmf));
tmf->tmf_code = code;
tmf->cb_state_func = tmf_sent_cb;
tmf->cb_data = cb_data;
}
static void isci_task_build_abort_task_tmf(struct isci_tmf *tmf,
enum isci_tmf_function_codes code,
void (*tmf_sent_cb)(enum isci_tmf_cb_state,
struct isci_tmf *,
void *),
struct isci_request *old_request)
{
isci_task_build_tmf(tmf, code, tmf_sent_cb, old_request);
tmf->io_tag = old_request->io_tag;
}
/**
* 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);
}
return old_state;
}
static int isci_request_is_dealloc_managed(enum isci_request_status stat)
{
switch (stat) {
case aborted:
case aborting:
case terminating:
case completed:
case dead:
return true;
default:
return false;
}
}
/**
* 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).
* @ihost: This SCU.
* @idev: The target.
* @isci_request: The I/O request to be terminated.
*
*/
static void isci_terminate_request_core(struct isci_host *ihost,
struct isci_remote_device *idev,
struct isci_request *isci_request)
{
enum sci_status status = SCI_SUCCESS;
bool was_terminated = false;
bool needs_cleanup_handling = false;
unsigned long flags;
unsigned long termination_completed = 1;
struct completion *io_request_completion;
dev_dbg(&ihost->pdev->dev,
"%s: device = %p; request = %p\n",
__func__, idev, isci_request);
spin_lock_irqsave(&ihost->scic_lock, flags);
io_request_completion = isci_request->io_request_completion;
/* Note that we are not going to control
* the target to abort the request.
*/
set_bit(IREQ_COMPLETE_IN_TARGET, &isci_request->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 (!test_bit(IREQ_TERMINATED, &isci_request->flags)) {
was_terminated = true;
needs_cleanup_handling = true;
status = sci_controller_terminate_request(ihost,
idev,
isci_request);
}
spin_unlock_irqrestore(&ihost->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_dbg(&ihost->pdev->dev,
"%s: sci_controller_terminate_request"
" returned = 0x%x\n",
__func__, status);
isci_request->io_request_completion = NULL;
} else {
if (was_terminated) {
dev_dbg(&ihost->pdev->dev,
"%s: before completion wait (%p/%p)\n",
__func__, isci_request, io_request_completion);
/* Wait here for the request to complete. */
termination_completed
= wait_for_completion_timeout(
io_request_completion,
msecs_to_jiffies(ISCI_TERMINATION_TIMEOUT_MSEC));
if (!termination_completed) {
/* The request to terminate has timed out. */
spin_lock_irqsave(&ihost->scic_lock, flags);
/* Check for state changes. */
if (!test_bit(IREQ_TERMINATED,
&isci_request->flags)) {
/* The best we can do is to have the
* request die a silent death if it
* ever really completes.
*/
isci_request_mark_zombie(ihost,
isci_request);
needs_cleanup_handling = true;
} else
termination_completed = 1;
spin_unlock_irqrestore(&ihost->scic_lock,
flags);
if (!termination_completed) {
dev_dbg(&ihost->pdev->dev,
"%s: *** Timeout waiting for "
"termination(%p/%p)\n",
__func__, io_request_completion,
isci_request);
/* The request can no longer be referenced
* safely since it may go away if the
* termination every really does complete.
*/
isci_request = NULL;
}
}
if (termination_completed)
dev_dbg(&ihost->pdev->dev,
"%s: after completion wait (%p/%p)\n",
__func__, isci_request, io_request_completion);
}
if (termination_completed) {
isci_request->io_request_completion = NULL;
/* Peek at the 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);
needs_cleanup_handling
= isci_request_is_dealloc_managed(
isci_request->status);
spin_unlock_irqrestore(&isci_request->state_lock, flags);
}
if (needs_cleanup_handling) {
dev_dbg(&ihost->pdev->dev,
"%s: cleanup isci_device=%p, request=%p\n",
__func__, idev, isci_request);
if (isci_request != NULL) {
spin_lock_irqsave(&ihost->scic_lock, flags);
isci_free_tag(ihost, isci_request->io_tag);
isci_request_change_state(isci_request, unallocated);
list_del_init(&isci_request->dev_node);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
}
}
}
}
/**
* 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.
* @idev: This parameter specifies the target.
*
*/
void isci_terminate_pending_requests(struct isci_host *ihost,
struct isci_remote_device *idev)
{
struct completion request_completion;
enum isci_request_status old_state;
unsigned long flags;
LIST_HEAD(list);
spin_lock_irqsave(&ihost->scic_lock, flags);
list_splice_init(&idev->reqs_in_process, &list);
/* assumes that isci_terminate_request_core deletes from the list */
while (!list_empty(&list)) {
struct isci_request *ireq = list_entry(list.next, typeof(*ireq), dev_node);
/* Change state to "terminating" if it is currently
* "started".
*/
old_state = isci_request_change_started_to_newstate(ireq,
&request_completion,
terminating);
switch (old_state) {
case started:
case completed:
case aborting:
break;
default:
/* termination in progress, or otherwise dispositioned.
* We know the request was on 'list' so should be safe
* to move it back to reqs_in_process
*/
list_move(&ireq->dev_node, &idev->reqs_in_process);
ireq = NULL;
break;
}
if (!ireq)
continue;
spin_unlock_irqrestore(&ihost->scic_lock, flags);
init_completion(&request_completion);
dev_dbg(&ihost->pdev->dev,
"%s: idev=%p request=%p; task=%p old_state=%d\n",
__func__, idev, ireq,
(!test_bit(IREQ_TMF, &ireq->flags)
? isci_request_access_task(ireq)
: NULL),
old_state);
/* If the old_state is 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.
*
* If old_state == completed:
* This request completed from the SCU hardware perspective
* and now just needs cleaning up in terms of freeing the
* request and potentially calling up to libsas.
*
* If old_state == aborting:
* This request has already gone through a TMF timeout, but may
* not have been terminated; needs cleaning up at least.
*/
isci_terminate_request_core(ihost, idev, ireq);
spin_lock_irqsave(&ihost->scic_lock, flags);
}
spin_unlock_irqrestore(&ihost->scic_lock, flags);
}
/**
* 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, NULL, NULL);
#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;
}
static int isci_task_send_lu_reset_sata(struct isci_host *ihost,
struct isci_remote_device *idev, u8 *lun)
{
int ret = TMF_RESP_FUNC_FAILED;
struct isci_tmf tmf;
/* Send the soft reset to the target */
#define ISCI_SRST_TIMEOUT_MS 25000 /* 25 second timeout. */
isci_task_build_tmf(&tmf, isci_tmf_sata_srst_high, NULL, NULL);
ret = isci_task_execute_tmf(ihost, idev, &tmf, ISCI_SRST_TIMEOUT_MS);
if (ret != TMF_RESP_FUNC_COMPLETE) {
dev_dbg(&ihost->pdev->dev,
"%s: Assert SRST failed (%p) = %x",
__func__, idev, ret);
/* Return the failure so that the LUN reset is escalated
* to a target reset.
*/
}
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 = dev_to_ihost(domain_device);
struct isci_remote_device *isci_device;
unsigned long flags;
int ret;
spin_lock_irqsave(&isci_host->scic_lock, flags);
isci_device = isci_lookup_device(domain_device);
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
dev_dbg(&isci_host->pdev->dev,
"%s: domain_device=%p, isci_host=%p; isci_device=%p\n",
__func__, domain_device, isci_host, isci_device);
if (!isci_device) {
/* If the device is gone, stop the escalations. */
dev_dbg(&isci_host->pdev->dev, "%s: No dev\n", __func__);
ret = TMF_RESP_FUNC_COMPLETE;
goto out;
}
set_bit(IDEV_EH, &isci_device->flags);
/* 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);
out:
isci_put_device(isci_device);
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_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.
*/
if ((old_request->status != aborted)
&& (old_request->status != completed))
dev_dbg(&old_request->isci_host->pdev->dev,
"%s: Bad request status (%d): tmf=%p, old_request=%p\n",
__func__, old_request->status, tmf, old_request);
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_dbg(&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)
{
struct isci_host *isci_host = dev_to_ihost(task->dev);
DECLARE_COMPLETION_ONSTACK(aborted_io_completion);
struct isci_request *old_request = NULL;
enum isci_request_status old_state;
struct isci_remote_device *isci_device = NULL;
struct isci_tmf tmf;
int ret = TMF_RESP_FUNC_FAILED;
unsigned long flags;
int perform_termination = 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(&isci_host->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) &&
(task->task_state_flags & SAS_TASK_AT_INITIATOR) &&
old_request)
isci_device = isci_lookup_device(task->dev);
spin_unlock(&task->task_state_lock);
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
dev_dbg(&isci_host->pdev->dev,
"%s: dev = %p, task = %p, old_request == %p\n",
__func__, isci_device, task, old_request);
if (isci_device)
set_bit(IDEV_EH, &isci_device->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 (!isci_device || !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 sucessful.
*/
spin_lock_irqsave(&task->task_state_lock, flags);
task->task_state_flags |= SAS_TASK_STATE_DONE;
task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
SAS_TASK_STATE_PENDING);
spin_unlock_irqrestore(&task->task_state_lock, flags);
ret = TMF_RESP_FUNC_COMPLETE;
dev_dbg(&isci_host->pdev->dev,
"%s: abort task not needed for %p\n",
__func__, task);
goto out;
}
spin_lock_irqsave(&isci_host->scic_lock, flags);
/* Check the request status and change to "aborted" if currently
* "starting"; if true then set the I/O kernel completion
* struct that will be triggered when the request completes.
*/
old_state = isci_task_validate_request_to_abort(
old_request, isci_host, isci_device,
&aborted_io_completion);
if ((old_state != started) &&
(old_state != completed) &&
(old_state != aborting)) {
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
/* The request was already being handled by someone else (because
* they got to set the state away from started).
*/
dev_dbg(&isci_host->pdev->dev,
"%s: device = %p; old_request %p already being aborted\n",
__func__,
isci_device, old_request);
ret = TMF_RESP_FUNC_COMPLETE;
goto out;
}
if (task->task_proto == SAS_PROTOCOL_SMP ||
sas_protocol_ata(task->task_proto) ||
test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags)) {
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
dev_dbg(&isci_host->pdev->dev,
"%s: %s request"
" or complete_in_target (%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));
if (test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags)) {
spin_lock_irqsave(&task->task_state_lock, flags);
task->task_state_flags |= SAS_TASK_STATE_DONE;
task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
SAS_TASK_STATE_PENDING);
spin_unlock_irqrestore(&task->task_state_lock, flags);
ret = TMF_RESP_FUNC_COMPLETE;
} else {
spin_lock_irqsave(&task->task_state_lock, flags);
task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
SAS_TASK_STATE_PENDING);
spin_unlock_irqrestore(&task->task_state_lock, flags);
}
/* STP and SMP devices are not sent a TMF, but the
* outstanding I/O request is terminated below. This is
* because SATA/STP and SMP discovery path timeouts directly
* call the abort task interface for cleanup.
*/
perform_termination = 1;
} else {
/* Fill in the tmf stucture */
isci_task_build_abort_task_tmf(&tmf, isci_tmf_ssp_task_abort,
isci_abort_task_process_cb,
old_request);
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
#define ISCI_ABORT_TASK_TIMEOUT_MS 500 /* 1/2 second timeout */
ret = isci_task_execute_tmf(isci_host, isci_device, &tmf,
ISCI_ABORT_TASK_TIMEOUT_MS);
if (ret == TMF_RESP_FUNC_COMPLETE)
perform_termination = 1;
else
dev_dbg(&isci_host->pdev->dev,
"%s: isci_task_send_tmf failed\n", __func__);
}
if (perform_termination) {
set_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags);
/* 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);
}
/* Make sure we do not leave a reference to aborted_io_completion */
old_request->io_request_completion = NULL;
out:
isci_put_device(isci_device);
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.
* @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;
struct completion *request_complete = ireq->io_request_completion;
dev_dbg(&ihost->pdev->dev,
"%s: request = %p, status=%d\n",
__func__, ireq, completion_status);
isci_request_change_state(ireq, completed);
set_bit(IREQ_COMPLETE_IN_TARGET, &ireq->flags);
if (tmf) {
tmf->status = completion_status;
if (tmf->proto == SAS_PROTOCOL_SSP) {
memcpy(&tmf->resp.resp_iu,
&ireq->ssp.rsp,
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);
/* As soon as something is in the terminate path, deallocation is
* managed there. Note that the final non-managed state of a task
* request is "completed".
*/
if ((ireq->status == completed) ||
!isci_request_is_dealloc_managed(ireq->status)) {
isci_request_change_state(ireq, unallocated);
isci_free_tag(ihost, ireq->io_tag);
list_del_init(&ireq->dev_node);
}
/* "request_complete" is set if the task was being terminated. */
if (request_complete)
complete(request_complete);
/* The task management part completes last. */
if (tmf_complete)
complete(tmf_complete);
}
static int isci_reset_device(struct isci_host *ihost,
struct isci_remote_device *idev)
{
struct sas_phy *phy = sas_find_local_phy(idev->domain_dev);
enum sci_status status;
unsigned long flags;
int rc;
dev_dbg(&ihost->pdev->dev, "%s: idev %p\n", __func__, idev);
spin_lock_irqsave(&ihost->scic_lock, flags);
status = sci_remote_device_reset(idev);
if (status != SCI_SUCCESS) {
spin_unlock_irqrestore(&ihost->scic_lock, flags);
dev_dbg(&ihost->pdev->dev,
"%s: sci_remote_device_reset(%p) returned %d!\n",
__func__, idev, status);
return TMF_RESP_FUNC_FAILED;
}
spin_unlock_irqrestore(&ihost->scic_lock, flags);
rc = sas_phy_reset(phy, true);
/* Terminate in-progress I/O now. */
isci_remote_device_nuke_requests(ihost, idev);
/* Since all pending TCs have been cleaned, resume the RNC. */
spin_lock_irqsave(&ihost->scic_lock, flags);
status = sci_remote_device_reset_complete(idev);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
if (status != SCI_SUCCESS) {
dev_dbg(&ihost->pdev->dev,
"%s: sci_remote_device_reset_complete(%p) "
"returned %d!\n", __func__, idev, status);
}
dev_dbg(&ihost->pdev->dev, "%s: idev %p complete.\n", __func__, idev);
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_lookup_device(dev);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
if (!idev || !test_bit(IDEV_EH, &idev->flags)) {
ret = TMF_RESP_FUNC_COMPLETE;
goto out;
}
ret = isci_reset_device(ihost, idev);
out:
isci_put_device(idev);
return ret;
}
int isci_bus_reset_handler(struct scsi_cmnd *cmd)
{
struct domain_device *dev = sdev_to_domain_dev(cmd->device);
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_lookup_device(dev);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
if (!idev) {
ret = TMF_RESP_FUNC_COMPLETE;
goto out;
}
ret = isci_reset_device(ihost, idev);
out:
isci_put_device(idev);
return ret;
}
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