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-rw-r--r--drivers/scsi/isci/task.c1676
1 files changed, 1676 insertions, 0 deletions
diff --git a/drivers/scsi/isci/task.c b/drivers/scsi/isci/task.c
new file mode 100644
index 000000000000..d6bcdd013dc9
--- /dev/null
+++ b/drivers/scsi/isci/task.c
@@ -0,0 +1,1676 @@
+/*
+ * 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);
+
+ /* 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 (tmf_task != ireq->ttype)
+ 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;
+}
+
+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;
+
+ 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) {
+ 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);
+
+ wait_for_completion(tmf->complete);
+ }
+
+ 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;
+}
+
+/**
+* isci_request_cleanup_completed_loiterer() - This function will take care of
+* the final cleanup on any request which has been explicitly terminated.
+* @isci_host: This parameter specifies the ISCI host object
+* @isci_device: This is the device to which the request is pending.
+* @isci_request: This parameter specifies the terminated request object.
+* @task: This parameter is the libsas I/O request.
+*/
+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)
+{
+ unsigned long flags;
+
+ dev_dbg(&isci_host->pdev->dev,
+ "%s: isci_device=%p, request=%p, task=%p\n",
+ __func__, isci_device, isci_request, task);
+
+ if (task != NULL) {
+
+ spin_lock_irqsave(&task->task_state_lock, flags);
+ task->lldd_task = NULL;
+
+ task->task_state_flags &= ~SAS_TASK_NEED_DEV_RESET;
+
+ isci_set_task_doneflags(task);
+
+ /* If this task is not in the abort path, call task_done. */
+ if (!(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
+
+ spin_unlock_irqrestore(&task->task_state_lock, flags);
+ task->task_done(task);
+ } else
+ spin_unlock_irqrestore(&task->task_state_lock, flags);
+ }
+
+ if (isci_request != NULL) {
+ spin_lock_irqsave(&isci_host->scic_lock, flags);
+ list_del_init(&isci_request->dev_node);
+ spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+ }
+}
+
+/**
+ * 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;
+ enum isci_request_status request_status;
+ unsigned long flags;
+ unsigned long termination_completed = 1;
+ struct completion *io_request_completion;
+ struct sas_task *task;
+
+ 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;
+
+ task = (isci_request->ttype == io_task)
+ ? isci_request_access_task(isci_request)
+ : NULL;
+
+ /* 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. */
+ #define TERMINATION_TIMEOUT_MSEC 500
+ termination_completed
+ = wait_for_completion_timeout(
+ io_request_completion,
+ msecs_to_jiffies(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.
+ *
+ * Set the request state to "dead",
+ * and clear the task pointer so that
+ * an actual completion event callback
+ * doesn't do anything.
+ */
+ isci_request->status = dead;
+ isci_request->io_request_completion
+ = NULL;
+
+ if (isci_request->ttype == io_task) {
+
+ /* Break links with the
+ * sas_task.
+ */
+ isci_request->ttype_ptr.io_task_ptr
+ = NULL;
+ }
+ } 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);
+ request_status = isci_request->status;
+
+ if ((isci_request->ttype == io_task) /* TMFs are in their own thread */
+ && ((request_status == aborted)
+ || (request_status == aborting)
+ || (request_status == terminating)
+ || (request_status == completed)
+ || (request_status == dead)
+ )
+ ) {
+
+ /* The completion routine won't free a request in
+ * the aborted/aborting/etc. states, so we do
+ * it here.
+ */
+ needs_cleanup_handling = true;
+ }
+ spin_unlock_irqrestore(&isci_request->state_lock, flags);
+
+ }
+ if (needs_cleanup_handling)
+ isci_request_cleanup_completed_loiterer(
+ ihost, idev, isci_request, task);
+ }
+}
+
+/**
+ * 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,
+ ireq->ttype == io_task ? 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)
+ set_bit(IDEV_EH, &isci_device->flags);
+
+ /* 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 ||
+ isci_device_is_reset_pending(isci_host, isci_device)) {
+ dev_dbg(&isci_host->pdev->dev,
+ "%s: No dev (%p), or "
+ "RESET PENDING: domain_device=%p\n",
+ __func__, isci_device, domain_device);
+ ret = TMF_RESP_FUNC_FAILED;
+ goto out;
+ }
+
+ /* 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;
+ bool any_dev_reset = false;
+
+ /* 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: task = %p\n", __func__, task);
+
+ if (!isci_device || !old_request)
+ goto out;
+
+ set_bit(IDEV_EH, &isci_device->flags);
+
+ /* 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)) {
+ dev_dbg(&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);
+ goto out;
+ }
+
+ dev_dbg(&isci_host->pdev->dev,
+ "%s: old_request == %p\n", __func__, old_request);
+
+ any_dev_reset = isci_device_is_reset_pending(isci_host, isci_device);
+
+ spin_lock_irqsave(&task->task_state_lock, flags);
+
+ any_dev_reset = any_dev_reset || (task->task_state_flags & SAS_TASK_NEED_DEV_RESET);
+
+ /* 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) || any_dev_reset) {
+
+ /* 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;
+
+ /* Make the reset happen as soon as possible. */
+ task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
+
+ spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+ /* 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 {
+ /* 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);
+
+ 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;
+ } else {
+ spin_unlock_irqrestore(&task->task_state_lock, flags);
+ }
+
+ 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 ||
+ test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags)) {
+
+ spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+
+ dev_dbg(&isci_host->pdev->dev,
+ "%s: SMP request (%d)"
+ " or complete_in_target (%d), thus no TMF\n",
+ __func__, (task->task_proto == SAS_PROTOCOL_SMP),
+ test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->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 below.
+ */
+ } 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 /* half second timeout. */
+ ret = isci_task_execute_tmf(isci_host, isci_device, &tmf,
+ ISCI_ABORT_TASK_TIMEOUT_MS);
+
+ if (ret != TMF_RESP_FUNC_COMPLETE)
+ dev_dbg(&isci_host->pdev->dev,
+ "%s: isci_task_send_tmf failed\n",
+ __func__);
+ }
+ if (ret == TMF_RESP_FUNC_COMPLETE) {
+ 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;
+
+ dev_dbg(&ihost->pdev->dev,
+ "%s: request = %p, status=%d\n",
+ __func__, ireq, completion_status);
+
+ isci_request_change_state(ireq, completed);
+
+ tmf->status = completion_status;
+ set_bit(IREQ_COMPLETE_IN_TARGET, &ireq->flags);
+
+ 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);
+
+ isci_request_change_state(ireq, unallocated);
+ list_del_init(&ireq->dev_node);
+
+ /* The task management part completes last. */
+ complete(tmf_complete);
+}
+
+static void isci_smp_task_timedout(unsigned long _task)
+{
+ struct sas_task *task = (void *) _task;
+ unsigned long flags;
+
+ spin_lock_irqsave(&task->task_state_lock, flags);
+ if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
+ task->task_state_flags |= SAS_TASK_STATE_ABORTED;
+ spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+ complete(&task->completion);
+}
+
+static void isci_smp_task_done(struct sas_task *task)
+{
+ if (!del_timer(&task->timer))
+ return;
+ complete(&task->completion);
+}
+
+static struct sas_task *isci_alloc_task(void)
+{
+ struct sas_task *task = kzalloc(sizeof(*task), GFP_KERNEL);
+
+ if (task) {
+ INIT_LIST_HEAD(&task->list);
+ spin_lock_init(&task->task_state_lock);
+ task->task_state_flags = SAS_TASK_STATE_PENDING;
+ init_timer(&task->timer);
+ init_completion(&task->completion);
+ }
+
+ return task;
+}
+
+static void isci_free_task(struct isci_host *ihost, struct sas_task *task)
+{
+ if (task) {
+ BUG_ON(!list_empty(&task->list));
+ kfree(task);
+ }
+}
+
+static int isci_smp_execute_task(struct isci_host *ihost,
+ struct domain_device *dev, void *req,
+ int req_size, void *resp, int resp_size)
+{
+ int res, retry;
+ struct sas_task *task = NULL;
+
+ for (retry = 0; retry < 3; retry++) {
+ task = isci_alloc_task();
+ if (!task)
+ return -ENOMEM;
+
+ task->dev = dev;
+ task->task_proto = dev->tproto;
+ sg_init_one(&task->smp_task.smp_req, req, req_size);
+ sg_init_one(&task->smp_task.smp_resp, resp, resp_size);
+
+ task->task_done = isci_smp_task_done;
+
+ task->timer.data = (unsigned long) task;
+ task->timer.function = isci_smp_task_timedout;
+ task->timer.expires = jiffies + 10*HZ;
+ add_timer(&task->timer);
+
+ res = isci_task_execute_task(task, 1, GFP_KERNEL);
+
+ if (res) {
+ del_timer(&task->timer);
+ dev_dbg(&ihost->pdev->dev,
+ "%s: executing SMP task failed:%d\n",
+ __func__, res);
+ goto ex_err;
+ }
+
+ wait_for_completion(&task->completion);
+ res = -ECOMM;
+ if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
+ dev_dbg(&ihost->pdev->dev,
+ "%s: smp task timed out or aborted\n",
+ __func__);
+ isci_task_abort_task(task);
+ if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
+ dev_dbg(&ihost->pdev->dev,
+ "%s: SMP task aborted and not done\n",
+ __func__);
+ goto ex_err;
+ }
+ }
+ if (task->task_status.resp == SAS_TASK_COMPLETE &&
+ task->task_status.stat == SAM_STAT_GOOD) {
+ res = 0;
+ break;
+ }
+ if (task->task_status.resp == SAS_TASK_COMPLETE &&
+ task->task_status.stat == SAS_DATA_UNDERRUN) {
+ /* no error, but return the number of bytes of
+ * underrun */
+ res = task->task_status.residual;
+ break;
+ }
+ if (task->task_status.resp == SAS_TASK_COMPLETE &&
+ task->task_status.stat == SAS_DATA_OVERRUN) {
+ res = -EMSGSIZE;
+ break;
+ } else {
+ dev_dbg(&ihost->pdev->dev,
+ "%s: task to dev %016llx response: 0x%x "
+ "status 0x%x\n", __func__,
+ SAS_ADDR(dev->sas_addr),
+ task->task_status.resp,
+ task->task_status.stat);
+ isci_free_task(ihost, task);
+ task = NULL;
+ }
+ }
+ex_err:
+ BUG_ON(retry == 3 && task != NULL);
+ isci_free_task(ihost, task);
+ return res;
+}
+
+#define DISCOVER_REQ_SIZE 16
+#define DISCOVER_RESP_SIZE 56
+
+int isci_smp_get_phy_attached_dev_type(struct isci_host *ihost,
+ struct domain_device *dev,
+ int phy_id, int *adt)
+{
+ struct smp_resp *disc_resp;
+ u8 *disc_req;
+ int res;
+
+ disc_resp = kzalloc(DISCOVER_RESP_SIZE, GFP_KERNEL);
+ if (!disc_resp)
+ return -ENOMEM;
+
+ disc_req = kzalloc(DISCOVER_REQ_SIZE, GFP_KERNEL);
+ if (disc_req) {
+ disc_req[0] = SMP_REQUEST;
+ disc_req[1] = SMP_DISCOVER;
+ disc_req[9] = phy_id;
+ } else {
+ kfree(disc_resp);
+ return -ENOMEM;
+ }
+ res = isci_smp_execute_task(ihost, dev, disc_req, DISCOVER_REQ_SIZE,
+ disc_resp, DISCOVER_RESP_SIZE);
+ if (!res) {
+ if (disc_resp->result != SMP_RESP_FUNC_ACC)
+ res = disc_resp->result;
+ else
+ *adt = disc_resp->disc.attached_dev_type;
+ }
+ kfree(disc_req);
+ kfree(disc_resp);
+
+ return res;
+}
+
+static void isci_wait_for_smp_phy_reset(struct isci_remote_device *idev, int phy_num)
+{
+ struct domain_device *dev = idev->domain_dev;
+ struct isci_port *iport = idev->isci_port;
+ struct isci_host *ihost = iport->isci_host;
+ int res, iteration = 0, attached_device_type;
+ #define STP_WAIT_MSECS 25000
+ unsigned long tmo = msecs_to_jiffies(STP_WAIT_MSECS);
+ unsigned long deadline = jiffies + tmo;
+ enum {
+ SMP_PHYWAIT_PHYDOWN,
+ SMP_PHYWAIT_PHYUP,
+ SMP_PHYWAIT_DONE
+ } phy_state = SMP_PHYWAIT_PHYDOWN;
+
+ /* While there is time, wait for the phy to go away and come back */
+ while (time_is_after_jiffies(deadline) && phy_state != SMP_PHYWAIT_DONE) {
+ int event = atomic_read(&iport->event);
+
+ ++iteration;
+
+ tmo = wait_event_timeout(ihost->eventq,
+ event != atomic_read(&iport->event) ||
+ !test_bit(IPORT_BCN_BLOCKED, &iport->flags),
+ tmo);
+ /* link down, stop polling */
+ if (!test_bit(IPORT_BCN_BLOCKED, &iport->flags))
+ break;
+
+ dev_dbg(&ihost->pdev->dev,
+ "%s: iport %p, iteration %d,"
+ " phase %d: time_remaining %lu, bcns = %d\n",
+ __func__, iport, iteration, phy_state,
+ tmo, test_bit(IPORT_BCN_PENDING, &iport->flags));
+
+ res = isci_smp_get_phy_attached_dev_type(ihost, dev, phy_num,
+ &attached_device_type);
+ tmo = deadline - jiffies;
+
+ if (res) {
+ dev_dbg(&ihost->pdev->dev,
+ "%s: iteration %d, phase %d:"
+ " SMP error=%d, time_remaining=%lu\n",
+ __func__, iteration, phy_state, res, tmo);
+ break;
+ }
+ dev_dbg(&ihost->pdev->dev,
+ "%s: iport %p, iteration %d,"
+ " phase %d: time_remaining %lu, bcns = %d, "
+ "attdevtype = %x\n",
+ __func__, iport, iteration, phy_state,
+ tmo, test_bit(IPORT_BCN_PENDING, &iport->flags),
+ attached_device_type);
+
+ switch (phy_state) {
+ case SMP_PHYWAIT_PHYDOWN:
+ /* Has the device gone away? */
+ if (!attached_device_type)
+ phy_state = SMP_PHYWAIT_PHYUP;
+
+ break;
+
+ case SMP_PHYWAIT_PHYUP:
+ /* Has the device come back? */
+ if (attached_device_type)
+ phy_state = SMP_PHYWAIT_DONE;
+ break;
+
+ case SMP_PHYWAIT_DONE:
+ break;
+ }
+
+ }
+ dev_dbg(&ihost->pdev->dev, "%s: done\n", __func__);
+}
+
+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);
+ struct isci_port *iport = idev->isci_port;
+ 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);
+
+ /* Make sure all pending requests are able to be fully terminated. */
+ isci_device_clear_reset_pending(ihost, idev);
+
+ /* If this is a device on an expander, disable BCN processing. */
+ if (!scsi_is_sas_phy_local(phy))
+ set_bit(IPORT_BCN_BLOCKED, &iport->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 this is a device on an expander, bring the phy back up. */
+ if (!scsi_is_sas_phy_local(phy)) {
+ /* A phy reset will cause the device to go away then reappear.
+ * Since libsas will take action on incoming BCNs (eg. remove
+ * a device going through an SMP phy-control driven reset),
+ * we need to wait until the phy comes back up before letting
+ * discovery proceed in libsas.
+ */
+ isci_wait_for_smp_phy_reset(idev, phy->number);
+
+ spin_lock_irqsave(&ihost->scic_lock, flags);
+ isci_port_bcn_enable(ihost, idev->isci_port);
+ 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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