Interface to core/ for request construction, submission, completion and
error handling.
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
drivers/scsi/isci/request.c | 1472 +++++++++++++++++++++++++++++++++++++++++++
drivers/scsi/isci/request.h | 429 +++++++++++++
2 files changed, 1901 insertions(+), 0 deletions(-)
create mode 100644 drivers/scsi/isci/request.c
create mode 100644 drivers/scsi/isci/request.h
diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c
new file mode 100644
index 0000000..e564121
--- /dev/null
+++ b/drivers/scsi/isci/request.c
@@ -0,0 +1,1472 @@
+/*
+ * 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 "isci.h"
+#include "scic_remote_device.h"
+#include "scic_io_request.h"
+#include "scic_task_request.h"
+#include "scic_port.h"
+#include "task.h"
+#include "request.h"
+#include "sata.h"
+#include "scu_completion_codes.h"
+
+
+static enum sci_status isci_request_ssp_request_construct(
+ struct isci_request *request)
+{
+ enum sci_status status;
+
+ dev_dbg(&request->isci_host->pdev->dev,
+ "%s: request = %p\n",
+ __func__,
+ request);
+ status = scic_io_request_construct_basic_ssp(
+ request->sci_request_handle
+ );
+ return status;
+}
+
+static enum sci_status isci_request_stp_request_construct(
+ struct isci_request *request)
+{
+ struct sas_task *task = isci_request_access_task(request);
+ enum sci_status status;
+ struct host_to_dev_fis *register_fis;
+
+ dev_dbg(&request->isci_host->pdev->dev,
+ "%s: request = %p\n",
+ __func__,
+ request);
+
+ /* Get the host_to_dev_fis from the core and copy
+ * the fis from the task into it.
+ */
+ register_fis = isci_sata_task_to_fis_copy(task);
+
+ status = scic_io_request_construct_basic_sata(
+ request->sci_request_handle
+ );
+
+ /* Set the ncq tag in the fis, from the queue
+ * command in the task.
+ */
+ if (isci_sata_is_task_ncq(task)) {
+
+ isci_sata_set_ncq_tag(
+ register_fis,
+ task
+ );
+ }
+
+ return status;
+}
+
+/**
+ * isci_smp_request_build() - This function builds the smp 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.
+ * @sci_device: This parameter is the handle for the sci core's remote device
+ * object that is the destination for this request.
+ *
+ * SCI_SUCCESS on successfull completion, or specific failure code.
+ */
+static enum sci_status isci_smp_request_build(
+ struct isci_request *request)
+{
+ enum sci_status status = SCI_FAILURE;
+ struct sas_task *task = isci_request_access_task(request);
+
+ void *command_iu_address =
+ scic_io_request_get_command_iu_address(
+ request->sci_request_handle
+ );
+
+ dev_dbg(&request->isci_host->pdev->dev,
+ "%s: request = %p\n",
+ __func__,
+ request);
+ dev_dbg(&request->isci_host->pdev->dev,
+ "%s: smp_req len = %d\n",
+ __func__,
+ task->smp_task.smp_req.length);
+
+ /* copy the smp_command to the address; */
+ sg_copy_to_buffer(&task->smp_task.smp_req, 1,
+ (char *)command_iu_address,
+ sizeof(struct smp_request)
+ );
+
+ status = scic_io_request_construct_smp(request->sci_request_handle);
+ if (status != SCI_SUCCESS)
+ dev_warn(&request->isci_host->pdev->dev,
+ "%s: scic_io_request_construct_smp failed with "
+ "status = %d\n",
+ __func__,
+ status);
+
+ return status;
+}
+
+/**
+ * isci_io_request_build() - This function builds the io 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.
+ * @sci_device: This parameter is the handle for the sci core's remote device
+ * object that is the destination for this request.
+ *
+ * SCI_SUCCESS on successfull completion, or specific failure code.
+ */
+static enum sci_status isci_io_request_build(
+ struct isci_host *isci_host,
+ struct isci_request *request,
+ struct isci_remote_device *isci_device)
+{
+ struct smp_discover_response_protocols dev_protocols;
+ enum sci_status status = SCI_SUCCESS;
+ struct sas_task *task = isci_request_access_task(request);
+ struct scic_sds_remote_device *sci_device =
+ isci_device->sci_device_handle;
+
+ dev_dbg(&isci_host->pdev->dev,
+ "%s: isci_device = 0x%p; request = %p, "
+ "num_scatter = %d\n",
+ __func__,
+ isci_device,
+ request,
+ task->num_scatter);
+
+ /* map the sgl addresses, if present.
+ * libata does the mapping for sata devices
+ * before we get the request.
+ */
+ if (task->num_scatter &&
+ !sas_protocol_ata(task->task_proto) &&
+ !(SAS_PROTOCOL_SMP & task->task_proto)) {
+
+ request->num_sg_entries = dma_map_sg(
+ &isci_host->pdev->dev,
+ task->scatter,
+ task->num_scatter,
+ task->data_dir
+ );
+
+ if (request->num_sg_entries == 0)
+ return SCI_FAILURE_INSUFFICIENT_RESOURCES;
+ }
+
+ /* build the common request object. For now,
+ * we will let the core allocate the IO tag.
+ */
+ status = scic_io_request_construct(
+ isci_host->core_controller,
+ sci_device,
+ SCI_CONTROLLER_INVALID_IO_TAG,
+ request,
+ request->sci_request_mem_ptr,
+ (struct scic_sds_request **)&request->sci_request_handle
+ );
+
+ if (status != SCI_SUCCESS) {
+ dev_warn(&isci_host->pdev->dev,
+ "%s: failed request construct\n",
+ __func__);
+ return SCI_FAILURE;
+ }
+
+ sci_object_set_association(request->sci_request_handle, request);
+
+ /* Determine protocol and call the appropriate basic constructor */
+ scic_remote_device_get_protocols(sci_device, &dev_protocols);
+ if (dev_protocols.u.bits.attached_ssp_target)
+ status = isci_request_ssp_request_construct(request);
+ else if (dev_protocols.u.bits.attached_stp_target)
+ status = isci_request_stp_request_construct(request);
+ else if (dev_protocols.u.bits.attached_smp_target)
+ status = isci_smp_request_build(request);
+ else {
+ dev_warn(&isci_host->pdev->dev,
+ "%s: unknown protocol\n", __func__);
+ return SCI_FAILURE;
+ }
+
+ return SCI_SUCCESS;
+}
+
+
+/**
+ * isci_request_alloc_core() - This function gets the request object from the
+ * isci_host dma cache.
+ * @isci_host: This parameter specifies the ISCI host object
+ * @isci_request: This parameter will contain the pointer to the new
+ * isci_request object.
+ * @isci_device: This parameter is the pointer to the isci remote device object
+ * that is the destination for this request.
+ * @gfp_flags: This parameter specifies the os allocation flags.
+ *
+ * SCI_SUCCESS on successfull completion, or specific failure code.
+ */
+static int isci_request_alloc_core(
+ struct isci_host *isci_host,
+ struct isci_request **isci_request,
+ struct isci_remote_device *isci_device,
+ gfp_t gfp_flags)
+{
+ int ret = 0;
+ dma_addr_t handle;
+ struct isci_request *request;
+
+
+ /* get pointer to dma memory. This actually points
+ * to both the isci_remote_device object and the
+ * sci object. The isci object is at the beginning
+ * of the memory allocated here.
+ */
+ request = dma_pool_alloc(isci_host->dma_pool, gfp_flags, &handle);
+ if (!request) {
+ dev_warn(&isci_host->pdev->dev,
+ "%s: dma_pool_alloc returned NULL\n", __func__);
+ return -ENOMEM;
+ }
+
+ /* initialize the request object. */
+ spin_lock_init(&request->state_lock);
+ isci_request_change_state(request, allocated);
+ request->sci_request_mem_ptr = ((u8 *)request) +
+ sizeof(struct isci_request);
+ request->request_daddr = handle;
+ request->isci_host = isci_host;
+ request->isci_device = isci_device;
+ request->io_request_completion = NULL;
+
+ request->request_alloc_size = isci_host->dma_pool_alloc_size;
+ request->num_sg_entries = 0;
+
+ request->complete_in_target = false;
+
+ INIT_LIST_HEAD(&request->completed_node);
+ INIT_LIST_HEAD(&request->dev_node);
+
+ *isci_request = request;
+
+ return ret;
+}
+
+static int isci_request_alloc_io(
+ struct isci_host *isci_host,
+ struct sas_task *task,
+ struct isci_request **isci_request,
+ struct isci_remote_device *isci_device,
+ gfp_t gfp_flags)
+{
+ int retval = isci_request_alloc_core(isci_host, isci_request,
+ isci_device, gfp_flags);
+
+ if (!retval) {
+ (*isci_request)->ttype_ptr.io_task_ptr = task;
+ (*isci_request)->ttype = io_task;
+
+ task->lldd_task = *isci_request;
+ }
+ return retval;
+}
+
+/**
+ * isci_request_alloc_tmf() - This function gets the request object from the
+ * isci_host dma cache and initializes the relevant fields as a sas_task.
+ * @isci_host: This parameter specifies the ISCI host object
+ * @sas_task: This parameter is the task struct from the upper layer driver.
+ * @isci_request: This parameter will contain the pointer to the new
+ * isci_request object.
+ * @isci_device: This parameter is the pointer to the isci remote device object
+ * that is the destination for this request.
+ * @gfp_flags: This parameter specifies the os allocation flags.
+ *
+ * SCI_SUCCESS on successfull completion, or specific failure code.
+ */
+int isci_request_alloc_tmf(
+ struct isci_host *isci_host,
+ struct isci_tmf *isci_tmf,
+ struct isci_request **isci_request,
+ struct isci_remote_device *isci_device,
+ gfp_t gfp_flags)
+{
+ int retval = isci_request_alloc_core(isci_host, isci_request,
+ isci_device, gfp_flags);
+
+ if (!retval) {
+
+ (*isci_request)->ttype_ptr.tmf_task_ptr = isci_tmf;
+ (*isci_request)->ttype = tmf_task;
+ }
+ return retval;
+}
+
+/**
+ * isci_request_signal_device_reset() - This function will set the "device
+ * needs target reset" flag in the given sas_tasks' task_state_flags, and
+ * then cause the task to be added into the SCSI error handler queue which
+ * will eventually be escalated to a target reset.
+ *
+ *
+ */
+static void isci_request_signal_device_reset(
+ struct isci_request *isci_request)
+{
+ unsigned long flags;
+ struct sas_task *task = isci_request_access_task(isci_request);
+
+ dev_dbg(&isci_request->isci_host->pdev->dev,
+ "%s: request=%p, task=%p\n", __func__, isci_request, task);
+
+ spin_lock_irqsave(&task->task_state_lock, flags);
+ task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
+ spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+ /* Cause this task to be scheduled in the SCSI error handler
+ * thread.
+ */
+ sas_task_abort(task);
+}
+
+/**
+ * isci_request_execute() - This function allocates the isci_request object,
+ * all fills in some common fields.
+ * @isci_host: This parameter specifies the ISCI host object
+ * @sas_task: This parameter is the task struct from the upper layer driver.
+ * @isci_request: This parameter will contain the pointer to the new
+ * isci_request object.
+ * @gfp_flags: This parameter specifies the os allocation flags.
+ *
+ * SCI_SUCCESS on successfull completion, or specific failure code.
+ */
+int isci_request_execute(
+ struct isci_host *isci_host,
+ struct sas_task *task,
+ struct isci_request **isci_request,
+ gfp_t gfp_flags)
+{
+ int ret = 0;
+ struct scic_sds_remote_device *sci_device;
+ enum sci_status status = SCI_FAILURE_UNSUPPORTED_PROTOCOL;
+ struct isci_remote_device *isci_device;
+ struct isci_request *request;
+ unsigned long flags;
+
+ isci_device = isci_dev_from_domain_dev(task->dev);
+ sci_device = isci_device->sci_device_handle;
+
+ /* do common allocation and init of request object. */
+ ret = isci_request_alloc_io(
+ isci_host,
+ task,
+ &request,
+ isci_device,
+ gfp_flags
+ );
+
+ if (ret)
+ goto out;
+
+ status = isci_io_request_build(isci_host, request, isci_device);
+ if (status == SCI_SUCCESS) {
+
+ spin_lock_irqsave(&isci_host->scic_lock, flags);
+
+ /* send the request, let the core assign the IO TAG. */
+ status = scic_controller_start_io(
+ isci_host->core_controller,
+ sci_device,
+ request->sci_request_handle,
+ SCI_CONTROLLER_INVALID_IO_TAG
+ );
+
+ if (status == SCI_SUCCESS ||
+ status == SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) {
+
+ /* Either I/O started OK, or the core has signaled that
+ * the device needs a target reset.
+ *
+ * In either case, hold onto the I/O for later.
+ *
+ * Update it's status and add it to the list in the
+ * remote device object.
+ */
+ isci_request_change_state(request, started);
+ list_add(&request->dev_node,
+ &isci_device->reqs_in_process);
+
+ if (status ==
+ SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) {
+ /* Signal libsas that we need the SCSI error
+ * handler thread to work on this I/O and that
+ * we want a device reset.
+ */
+ isci_request_signal_device_reset(request);
+
+ /* Change the status, since we are holding
+ * the I/O until it is managed by the SCSI
+ * error handler.
+ */
+ status = SCI_SUCCESS;
+ }
+ } else
+ dev_warn(&isci_host->pdev->dev,
+ "%s: failed request start\n",
+ __func__);
+
+ spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+
+ } else
+ dev_warn(&isci_host->pdev->dev,
+ "%s: request_construct failed - status = 0x%x\n",
+ __func__,
+ status);
+
+ out:
+ if (status != SCI_SUCCESS) {
+
+ /* release dma memory on failure. */
+ isci_request_free(isci_host, request);
+ request = NULL;
+ ret = SCI_FAILURE;
+ }
+
+ *isci_request = request;
+ return ret;
+}
+
+
+/**
+ * isci_request_process_response_iu() - This function sets the status and
+ * response iu, in the task struct, from the request object for the upper
+ * layer driver.
+ * @sas_task: This parameter is the task struct from the upper layer driver.
+ * @resp_iu: This parameter points to the response iu of the completed request.
+ * @dev: This parameter specifies the linux device struct.
+ *
+ * none.
+ */
+static void isci_request_process_response_iu(
+ struct sas_task *task,
+ struct ssp_response_iu *resp_iu,
+ struct device *dev)
+{
+ dev_dbg(dev,
+ "%s: resp_iu = %p "
+ "resp_iu->status = 0x%x,\nresp_iu->datapres = %d "
+ "resp_iu->response_data_len = %x, "
+ "resp_iu->sense_data_len = %x\nrepsonse data: ",
+ __func__,
+ resp_iu,
+ resp_iu->status,
+ resp_iu->datapres,
+ resp_iu->response_data_len,
+ resp_iu->sense_data_len);
+
+ task->task_status.stat = resp_iu->status;
+
+ /* libsas updates the task status fields based on the response iu. */
+ sas_ssp_task_response(dev, task, resp_iu);
+}
+
+/**
+ * isci_request_set_open_reject_status() - This function prepares the I/O
+ * completion for OPEN_REJECT conditions.
+ * @request: This parameter is the completed isci_request object.
+ * @response_ptr: This parameter specifies the service response for the I/O.
+ * @status_ptr: This parameter specifies the exec status for the I/O.
+ * @complete_to_host_ptr: This parameter specifies the action to be taken by
+ * the LLDD with respect to completing this request or forcing an abort
+ * condition on the I/O.
+ * @open_rej_reason: This parameter specifies the encoded reason for the
+ * abandon-class reject.
+ *
+ * none.
+ */
+static void isci_request_set_open_reject_status(
+ struct isci_request *request,
+ struct sas_task *task,
+ enum service_response *response_ptr,
+ enum exec_status *status_ptr,
+ enum isci_completion_selection *complete_to_host_ptr,
+ enum sas_open_rej_reason open_rej_reason)
+{
+ /* Task in the target is done. */
+ request->complete_in_target = true;
+ *response_ptr = SAS_TASK_UNDELIVERED;
+ *status_ptr = SAS_OPEN_REJECT;
+ *complete_to_host_ptr = isci_perform_normal_io_completion;
+ task->task_status.open_rej_reason = open_rej_reason;
+}
+
+/**
+ * isci_request_handle_controller_specific_errors() - This function decodes
+ * controller-specific I/O completion error conditions.
+ * @request: This parameter is the completed isci_request object.
+ * @response_ptr: This parameter specifies the service response for the I/O.
+ * @status_ptr: This parameter specifies the exec status for the I/O.
+ * @complete_to_host_ptr: This parameter specifies the action to be taken by
+ * the LLDD with respect to completing this request or forcing an abort
+ * condition on the I/O.
+ *
+ * none.
+ */
+static void isci_request_handle_controller_specific_errors(
+ struct isci_remote_device *isci_device,
+ struct isci_request *request,
+ struct sas_task *task,
+ enum service_response *response_ptr,
+ enum exec_status *status_ptr,
+ enum isci_completion_selection *complete_to_host_ptr)
+{
+ unsigned int cstatus;
+
+ cstatus = scic_request_get_controller_status(
+ request->sci_request_handle
+ );
+
+ dev_dbg(&request->isci_host->pdev->dev,
+ "%s: %p SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR "
+ "- controller status = 0x%x\n",
+ __func__, request, cstatus);
+
+ /* Decode the controller-specific errors; most
+ * important is to recognize those conditions in which
+ * the target may still have a task outstanding that
+ * must be aborted.
+ *
+ * Note that there are SCU completion codes being
+ * named in the decode below for which SCIC has already
+ * done work to handle them in a way other than as
+ * a controller-specific completion code; these are left
+ * in the decode below for completeness sake.
+ */
+ switch (cstatus) {
+ case SCU_TASK_DONE_DMASETUP_DIRERR:
+ /* Also SCU_TASK_DONE_SMP_FRM_TYPE_ERR: */
+ case SCU_TASK_DONE_XFERCNT_ERR:
+ /* Also SCU_TASK_DONE_SMP_UFI_ERR: */
+ if (task->task_proto == SAS_PROTOCOL_SMP) {
+ /* SCU_TASK_DONE_SMP_UFI_ERR == Task Done. */
+ *response_ptr = SAS_TASK_COMPLETE;
+
+ /* See if the device has been/is being stopped. Note
+ * that we ignore the quiesce state, since we are
+ * concerned about the actual device state.
+ */
+ if ((isci_device->status == isci_stopping) ||
+ (isci_device->status == isci_stopped))
+ *status_ptr = SAS_DEVICE_UNKNOWN;
+ else
+ *status_ptr = SAS_ABORTED_TASK;
+
+ request->complete_in_target = true;
+
+ *complete_to_host_ptr =
+ isci_perform_normal_io_completion;
+ } else {
+ /* Task in the target is not done. */
+ *response_ptr = SAS_TASK_UNDELIVERED;
+
+ if ((isci_device->status == isci_stopping) ||
+ (isci_device->status == isci_stopped))
+ *status_ptr = SAS_DEVICE_UNKNOWN;
+ else
+ *status_ptr = SAM_STAT_TASK_ABORTED;
+
+ request->complete_in_target = false;
+
+ *complete_to_host_ptr =
+ isci_perform_error_io_completion;
+ }
+
+ break;
+
+ case SCU_TASK_DONE_CRC_ERR:
+ case SCU_TASK_DONE_NAK_CMD_ERR:
+ case SCU_TASK_DONE_EXCESS_DATA:
+ case SCU_TASK_DONE_UNEXP_FIS:
+ /* Also SCU_TASK_DONE_UNEXP_RESP: */
+ case SCU_TASK_DONE_VIIT_ENTRY_NV: /* TODO - conditions? */
+ case SCU_TASK_DONE_IIT_ENTRY_NV: /* TODO - conditions? */
+ case SCU_TASK_DONE_RNCNV_OUTBOUND: /* TODO - conditions? */
+ /* These are conditions in which the target
+ * has completed the task, so that no cleanup
+ * is necessary.
+ */
+ *response_ptr = SAS_TASK_COMPLETE;
+
+ /* See if the device has been/is being stopped. Note
+ * that we ignore the quiesce state, since we are
+ * concerned about the actual device state.
+ */
+ if ((isci_device->status == isci_stopping) ||
+ (isci_device->status == isci_stopped))
+ *status_ptr = SAS_DEVICE_UNKNOWN;
+ else
+ *status_ptr = SAS_ABORTED_TASK;
+
+ request->complete_in_target = true;
+
+ *complete_to_host_ptr = isci_perform_normal_io_completion;
+ break;
+
+
+ /* Note that the only open reject completion codes seen here will be
+ * abandon-class codes; all others are automatically retried in the SCU.
+ */
+ case SCU_TASK_OPEN_REJECT_WRONG_DESTINATION:
+
+ isci_request_set_open_reject_status(
+ request, task, response_ptr, status_ptr,
+ complete_to_host_ptr, SAS_OREJ_WRONG_DEST);
+ break;
+
+ case SCU_TASK_OPEN_REJECT_ZONE_VIOLATION:
+
+ /* Note - the return of AB0 will change when
+ * libsas implements detection of zone violations.
+ */
+ isci_request_set_open_reject_status(
+ request, task, response_ptr, status_ptr,
+ complete_to_host_ptr, SAS_OREJ_RESV_AB0);
+ break;
+
+ case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_1:
+
+ isci_request_set_open_reject_status(
+ request, task, response_ptr, status_ptr,
+ complete_to_host_ptr, SAS_OREJ_RESV_AB1);
+ break;
+
+ case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_2:
+
+ isci_request_set_open_reject_status(
+ request, task, response_ptr, status_ptr,
+ complete_to_host_ptr, SAS_OREJ_RESV_AB2);
+ break;
+
+ case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_3:
+
+ isci_request_set_open_reject_status(
+ request, task, response_ptr, status_ptr,
+ complete_to_host_ptr, SAS_OREJ_RESV_AB3);
+ break;
+
+ case SCU_TASK_OPEN_REJECT_BAD_DESTINATION:
+
+ isci_request_set_open_reject_status(
+ request, task, response_ptr, status_ptr,
+ complete_to_host_ptr, SAS_OREJ_BAD_DEST);
+ break;
+
+ case SCU_TASK_OPEN_REJECT_STP_RESOURCES_BUSY:
+
+ isci_request_set_open_reject_status(
+ request, task, response_ptr, status_ptr,
+ complete_to_host_ptr, SAS_OREJ_STP_NORES);
+ break;
+
+ case SCU_TASK_OPEN_REJECT_PROTOCOL_NOT_SUPPORTED:
+
+ isci_request_set_open_reject_status(
+ request, task, response_ptr, status_ptr,
+ complete_to_host_ptr, SAS_OREJ_EPROTO);
+ break;
+
+ case SCU_TASK_OPEN_REJECT_CONNECTION_RATE_NOT_SUPPORTED:
+
+ isci_request_set_open_reject_status(
+ request, task, response_ptr, status_ptr,
+ complete_to_host_ptr, SAS_OREJ_CONN_RATE);
+ break;
+
+ case SCU_TASK_DONE_LL_R_ERR:
+ /* Also SCU_TASK_DONE_ACK_NAK_TO: */
+ case SCU_TASK_DONE_LL_PERR:
+ case SCU_TASK_DONE_LL_SY_TERM:
+ /* Also SCU_TASK_DONE_NAK_ERR:*/
+ case SCU_TASK_DONE_LL_LF_TERM:
+ /* Also SCU_TASK_DONE_DATA_LEN_ERR: */
+ case SCU_TASK_DONE_LL_ABORT_ERR:
+ case SCU_TASK_DONE_SEQ_INV_TYPE:
+ /* Also SCU_TASK_DONE_UNEXP_XR: */
+ case SCU_TASK_DONE_XR_IU_LEN_ERR:
+ case SCU_TASK_DONE_INV_FIS_LEN:
+ /* Also SCU_TASK_DONE_XR_WD_LEN: */
+ case SCU_TASK_DONE_SDMA_ERR:
+ case SCU_TASK_DONE_OFFSET_ERR:
+ case SCU_TASK_DONE_MAX_PLD_ERR:
+ case SCU_TASK_DONE_LF_ERR:
+ case SCU_TASK_DONE_SMP_RESP_TO_ERR: /* Escalate to dev reset? */
+ case SCU_TASK_DONE_SMP_LL_RX_ERR:
+ case SCU_TASK_DONE_UNEXP_DATA:
+ case SCU_TASK_DONE_UNEXP_SDBFIS:
+ case SCU_TASK_DONE_REG_ERR:
+ case SCU_TASK_DONE_SDB_ERR:
+ case SCU_TASK_DONE_TASK_ABORT:
+ default:
+ /* Task in the target is not done. */
+ *response_ptr = SAS_TASK_UNDELIVERED;
+ *status_ptr = SAM_STAT_TASK_ABORTED;
+ request->complete_in_target = false;
+
+ *complete_to_host_ptr = isci_perform_error_io_completion;
+ break;
+ }
+}
+
+/**
+ * isci_task_save_for_upper_layer_completion() - This function saves the
+ * request for later completion to the upper layer driver.
+ * @host: This parameter is a pointer to the host on which the the request
+ * should be queued (either as an error or success).
+ * @request: This parameter is the completed request.
+ * @response: This parameter is the response code for the completed task.
+ * @status: This parameter is the status code for the completed task.
+ *
+ * none.
+ */
+static void isci_task_save_for_upper_layer_completion(
+ struct isci_host *host,
+ struct isci_request *request,
+ enum service_response response,
+ enum exec_status status,
+ enum isci_completion_selection task_notification_selection)
+{
+ struct sas_task *task = isci_request_access_task(request);
+
+ isci_task_set_completion_status(task, response, status,
+ task_notification_selection);
+
+
+ /* Tasks aborted specifically by a call to the lldd_abort_task
+ * function should not be completed to the host in the regular path.
+ */
+ switch (task_notification_selection) {
+
+ case isci_perform_normal_io_completion:
+
+ /* Normal notification (task_done) */
+ dev_dbg(&host->pdev->dev,
+ "%s: Normal - task = %p, response=%d, status=%d\n",
+ __func__,
+ task,
+ response,
+ status);
+ /* Add to the completed list. */
+ list_add(&request->completed_node,
+ &host->requests_to_complete);
+ break;
+
+ case isci_perform_aborted_io_completion:
+ /*
+ * No notification because this request is already
+ * in the abort path.
+ */
+ dev_warn(&host->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_warn(&host->pdev->dev,
+ "%s: Error - task = %p, response=%d, status=%d\n",
+ __func__,
+ task,
+ response,
+ status);
+ /* Add to the aborted list. */
+ list_add(&request->completed_node,
+ &host->requests_to_abort);
+ break;
+
+ default:
+ dev_warn(&host->pdev->dev,
+ "%s: Unknown - task = %p, response=%d, status=%d\n",
+ __func__,
+ task,
+ response,
+ status);
+
+ /* Add to the aborted list. */
+ list_add(&request->completed_node,
+ &host->requests_to_abort);
+ break;
+ }
+}
+
+/**
+ * isci_request_io_request_complete() - This function is called by the sci core
+ * when an io 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_request_io_request_complete(
+ struct isci_host *isci_host,
+ struct isci_request *request,
+ enum sci_io_status completion_status)
+{
+ struct sas_task *task = isci_request_access_task(request);
+ struct ssp_response_iu *resp_iu;
+ void *resp_buf;
+ unsigned long task_flags;
+ unsigned long state_flags;
+ struct completion *io_request_completion;
+ struct isci_remote_device *isci_device = request->isci_device;
+ enum service_response response = SAS_TASK_UNDELIVERED;
+ enum exec_status status = SAS_ABORTED_TASK;
+ enum isci_request_status request_status;
+ enum isci_completion_selection complete_to_host
+ = isci_perform_normal_io_completion;
+
+ dev_dbg(&isci_host->pdev->dev,
+ "%s: request = %p, task = %p,\n"
+ "task->data_dir = %d completion_status = 0x%x\n",
+ __func__,
+ request,
+ task,
+ task->data_dir,
+ completion_status);
+
+ spin_lock_irqsave(&request->state_lock, state_flags);
+ request_status = isci_request_get_state(request);
+ spin_unlock_irqrestore(&request->state_lock, state_flags);
+
+ /* Decode the request status. Note that if the request has been
+ * aborted by a task management function, we don't care
+ * what the status is.
+ */
+ switch (request_status) {
+
+ case aborted:
+ /* "aborted" indicates that the request was aborted by a task
+ * management function, since once a task management request is
+ * perfomed by the device, the request only completes because
+ * of the subsequent driver terminate.
+ *
+ * Aborted also means an external thread is explicitly managing
+ * this request, so that we do not complete it up the stack.
+ *
+ * The target is still there (since the TMF was successful).
+ */
+ request->complete_in_target = true;
+ response = SAS_TASK_COMPLETE;
+
+ /* See if the device has been/is being stopped. Note
+ * that we ignore the quiesce state, since we are
+ * concerned about the actual device state.
+ */
+ if ((isci_device->status == isci_stopping)
+ || (isci_device->status == isci_stopped)
+ )
+ status = SAS_DEVICE_UNKNOWN;
+ else
+ status = SAS_ABORTED_TASK;
+
+ complete_to_host = isci_perform_aborted_io_completion;
+ /* This was an aborted request. */
+ break;
+
+ case aborting:
+ /* aborting means that the task management function tried and
+ * failed to abort the request. We need to note the request
+ * as SAS_TASK_UNDELIVERED, so that the scsi mid layer marks the
+ * target as down.
+ *
+ * Aborting also means an external thread is explicitly managing
+ * this request, so that we do not complete it up the stack.
+ */
+ request->complete_in_target = true;
+ response = SAS_TASK_UNDELIVERED;
+
+ if ((isci_device->status == isci_stopping) ||
+ (isci_device->status == isci_stopped))
+ /* The device has been /is being stopped. Note that
+ * we ignore the quiesce state, since we are
+ * concerned about the actual device state.
+ */
+ status = SAS_DEVICE_UNKNOWN;
+ else
+ status = SAS_PHY_DOWN;
+
+ complete_to_host = isci_perform_aborted_io_completion;
+
+ /* This was an aborted request. */
+ break;
+
+ case terminating:
+
+ /* This was an terminated request. This happens when
+ * the I/O is being terminated because of an action on
+ * the device (reset, tear down, etc.), and the I/O needs
+ * to be completed up the stack.
+ */
+ request->complete_in_target = true;
+ response = SAS_TASK_UNDELIVERED;
+
+ /* See if the device has been/is being stopped. Note
+ * that we ignore the quiesce state, since we are
+ * concerned about the actual device state.
+ */
+ if ((isci_device->status == isci_stopping) ||
+ (isci_device->status == isci_stopped))
+ status = SAS_DEVICE_UNKNOWN;
+ else
+ status = SAS_ABORTED_TASK;
+
+ complete_to_host = isci_perform_normal_io_completion;
+
+ /* This was a terminated request. */
+ break;
+
+ default:
+
+ /* This is an active request being completed from the core. */
+ switch (completion_status) {
+
+ case SCI_IO_FAILURE_RESPONSE_VALID:
+ dev_dbg(&isci_host->pdev->dev,
+ "%s: SCI_IO_FAILURE_RESPONSE_VALID (%p/%p)\n",
+ __func__,
+ request,
+ task);
+
+ if (sas_protocol_ata(task->task_proto)) {
+ resp_buf
+ = scic_stp_io_request_get_d2h_reg_address(
+ request->sci_request_handle
+ );
+ isci_request_process_stp_response(task,
+ resp_buf
+ );
+
+ } else if (SAS_PROTOCOL_SSP == task->task_proto) {
+
+ /* crack the iu response buffer. */
+ resp_iu
+ = scic_io_request_get_response_iu_address(
+ request->sci_request_handle
+ );
+
+ isci_request_process_response_iu(task, resp_iu,
+ &isci_host->pdev->dev
+ );
+
+ } else if (SAS_PROTOCOL_SMP == task->task_proto) {
+
+ dev_err(&isci_host->pdev->dev,
+ "%s: SCI_IO_FAILURE_RESPONSE_VALID: "
+ "SAS_PROTOCOL_SMP protocol\n",
+ __func__);
+
+ } else
+ dev_err(&isci_host->pdev->dev,
+ "%s: unknown protocol\n", __func__);
+
+ /* use the task status set in the task struct by the
+ * isci_request_process_response_iu call.
+ */
+ request->complete_in_target = true;
+ response = task->task_status.resp;
+ status = task->task_status.stat;
+ break;
+
+ case SCI_IO_SUCCESS:
+ case SCI_IO_SUCCESS_IO_DONE_EARLY:
+
+ response = SAS_TASK_COMPLETE;
+ status = SAM_STAT_GOOD;
+ request->complete_in_target = true;
+
+ if (task->task_proto == SAS_PROTOCOL_SMP) {
+
+ u8 *command_iu_address
+ = scic_io_request_get_command_iu_address(
+ request->sci_request_handle
+ );
+
+ dev_dbg(&isci_host->pdev->dev,
+ "%s: SMP protocol completion\n",
+ __func__);
+
+ sg_copy_from_buffer(
+ &task->smp_task.smp_resp, 1,
+ command_iu_address
+ + sizeof(struct smp_request),
+ sizeof(struct smp_resp)
+ );
+ } else if (completion_status
+ == SCI_IO_SUCCESS_IO_DONE_EARLY) {
+
+ /* This was an SSP / STP / SATA transfer.
+ * There is a possibility that less data than
+ * the maximum was transferred.
+ */
+ u32 transferred_length
+ = scic_io_request_get_number_of_bytes_transferred(
+ request->sci_request_handle);
+
+ task->task_status.residual
+ = task->total_xfer_len - transferred_length;
+
+ /* If there were residual bytes, call this an
+ * underrun.
+ */
+ if (task->task_status.residual != 0)
+ status = SAS_DATA_UNDERRUN;
+
+ dev_dbg(&isci_host->pdev->dev,
+ "%s: SCI_IO_SUCCESS_IO_DONE_EARLY %d\n",
+ __func__,
+ status);
+
+ } else
+ dev_dbg(&isci_host->pdev->dev,
+ "%s: SCI_IO_SUCCESS\n",
+ __func__);
+
+ break;
+
+ case SCI_IO_FAILURE_TERMINATED:
+ dev_dbg(&isci_host->pdev->dev,
+ "%s: SCI_IO_FAILURE_TERMINATED (%p/%p)\n",
+ __func__,
+ request,
+ task);
+
+ /* The request was terminated explicitly. No handling
+ * is needed in the SCSI error handler path.
+ */
+ request->complete_in_target = true;
+ response = SAS_TASK_UNDELIVERED;
+
+ /* See if the device has been/is being stopped. Note
+ * that we ignore the quiesce state, since we are
+ * concerned about the actual device state.
+ */
+ if ((isci_device->status == isci_stopping) ||
+ (isci_device->status == isci_stopped))
+ status = SAS_DEVICE_UNKNOWN;
+ else
+ status = SAS_ABORTED_TASK;
+
+ complete_to_host = isci_perform_normal_io_completion;
+ break;
+
+ case SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR:
+
+ isci_request_handle_controller_specific_errors(
+ isci_device, request, task, &response, &status,
+ &complete_to_host);
+
+ break;
+
+ case SCI_IO_FAILURE_REMOTE_DEVICE_RESET_REQUIRED:
+ /* This is a special case, in that the I/O completion
+ * is telling us that the device needs a reset.
+ * In order for the device reset condition to be
+ * noticed, the I/O has to be handled in the error
+ * handler. Set the reset flag and cause the
+ * SCSI error thread to be scheduled.
+ */
+ spin_lock_irqsave(&task->task_state_lock, task_flags);
+ task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
+ spin_unlock_irqrestore(&task->task_state_lock, task_flags);
+
+ complete_to_host = isci_perform_error_io_completion;
+ request->complete_in_target = false;
+ break;
+
+ default:
+ /* Catch any otherwise unhandled error codes here. */
+ dev_warn(&isci_host->pdev->dev,
+ "%s: invalid completion code: 0x%x - "
+ "isci_request = %p\n",
+ __func__, completion_status, request);
+
+ response = SAS_TASK_UNDELIVERED;
+
+ /* See if the device has been/is being stopped. Note
+ * that we ignore the quiesce state, since we are
+ * concerned about the actual device state.
+ */
+ if ((isci_device->status == isci_stopping) ||
+ (isci_device->status == isci_stopped))
+ status = SAS_DEVICE_UNKNOWN;
+ else
+ status = SAS_ABORTED_TASK;
+
+ complete_to_host = isci_perform_error_io_completion;
+ request->complete_in_target = false;
+ break;
+ }
+ break;
+ }
+
+ isci_request_unmap_sgl(request, isci_host->pdev);
+
+ /* Put the completed request on the correct list */
+ isci_task_save_for_upper_layer_completion(isci_host, request, response,
+ status, complete_to_host
+ );
+
+ /* complete the io request to the core. */
+ scic_controller_complete_io(
+ isci_host->core_controller,
+ isci_device->sci_device_handle,
+ request->sci_request_handle
+ );
+ /* NULL the request handle so it cannot be completed or
+ * terminated again, and to cause any calls into abort
+ * task to recognize the already completed case.
+ */
+ request->sci_request_handle = NULL;
+
+ /* Only remove the request from the remote device list
+ * of pending requests if we have not requested error
+ * handling on this request.
+ */
+ if (complete_to_host != isci_perform_error_io_completion)
+ list_del_init(&request->dev_node);
+
+
+ /* Save possible completion ptr. */
+ io_request_completion = request->io_request_completion;
+
+ if (io_request_completion) {
+
+ /* This is inherantly a regular I/O request,
+ * since we are currently in the regular
+ * I/O completion callback function.
+ * Signal whoever is waiting that this
+ * request is complete.
+ */
+ complete(io_request_completion);
+ }
+
+ isci_host_can_dequeue(isci_host, 1);
+}
+
+/**
+ * isci_request_io_request_get_transfer_length() - This function is called by
+ * the sci core to retrieve the transfer length for a given request.
+ * @request: This parameter is the isci_request object.
+ *
+ * length of transfer for specified request.
+ */
+u32 isci_request_io_request_get_transfer_length(struct isci_request *request)
+{
+ struct sas_task *task = isci_request_access_task(request);
+
+ dev_dbg(&request->isci_host->pdev->dev,
+ "%s: total_xfer_len: %d\n",
+ __func__,
+ task->total_xfer_len);
+ return task->total_xfer_len;
+}
+
+
+/**
+ * isci_request_io_request_get_data_direction() - This function is called by
+ * the sci core to retrieve the data direction for a given request.
+ * @request: This parameter is the isci_request object.
+ *
+ * data direction for specified request.
+ */
+SCI_IO_REQUEST_DATA_DIRECTION isci_request_io_request_get_data_direction(
+ struct isci_request *request)
+{
+ struct sas_task *task = isci_request_access_task(request);
+ SCI_IO_REQUEST_DATA_DIRECTION ret;
+
+ switch (task->data_dir) {
+
+ case DMA_FROM_DEVICE:
+ ret = SCI_IO_REQUEST_DATA_IN;
+ dev_dbg(&request->isci_host->pdev->dev,
+ "%s: request=%p, FROM_DEVICE\n",
+ __func__,
+ request);
+ break;
+
+ case DMA_TO_DEVICE:
+ ret = SCI_IO_REQUEST_DATA_OUT;
+ dev_dbg(&request->isci_host->pdev->dev,
+ "%s: request=%p, TO_DEVICE\n",
+ __func__,
+ request);
+ break;
+
+ case DMA_BIDIRECTIONAL:
+ case DMA_NONE:
+ default:
+ ret = SCI_IO_REQUEST_NO_DATA;
+ dev_dbg(&request->isci_host->pdev->dev,
+ "%s: request=%p, unhandled direction case, "
+ "data_dir=%d\n",
+ __func__,
+ request,
+ task->data_dir);
+ break;
+
+ }
+ return ret;
+}
+
+/**
+ * isci_request_sge_get_address_field() - This function is called by the sci
+ * core to retrieve the address field contents for a given sge.
+ * @request: This parameter is the isci_request object.
+ * @sge_address: This parameter is the sge.
+ *
+ * physical address in the specified sge.
+ */
+dma_addr_t isci_request_sge_get_address_field(
+ struct isci_request *request,
+ void *sge_address)
+{
+ struct sas_task *task = isci_request_access_task(request);
+ dma_addr_t ret;
+ struct isci_host *isci_host = isci_host_from_sas_ha(
+ task->dev->port->ha);
+
+ dev_dbg(&isci_host->pdev->dev,
+ "%s: request = %p, sge_address = %p\n",
+ __func__,
+ request,
+ sge_address);
+
+ if (task->data_dir == PCI_DMA_NONE)
+ return 0;
+
+ /* the case where num_scatter == 0 is special, in that
+ * task->scatter is the actual buffer address, not an sgl.
+ * so a map single is required here.
+ */
+ if ((task->num_scatter == 0) &&
+ !sas_protocol_ata(task->task_proto)) {
+ ret = dma_map_single(
+ &isci_host->pdev->dev,
+ task->scatter,
+ task->total_xfer_len,
+ task->data_dir
+ );
+ request->zero_scatter_daddr = ret;
+ } else
+ ret = sg_dma_address(((struct scatterlist *)sge_address));
+
+ dev_dbg(&isci_host->pdev->dev,
+ "%s: bus address = %lx\n",
+ __func__,
+ (unsigned long)ret);
+
+ return ret;
+}
+
+
+/**
+ * isci_request_sge_get_length_field() - This function is called by the sci
+ * core to retrieve the length field contents for a given sge.
+ * @request: This parameter is the isci_request object.
+ * @sge_address: This parameter is the sge.
+ *
+ * length field value in the specified sge.
+ */
+u32 isci_request_sge_get_length_field(
+ struct isci_request *request,
+ void *sge_address)
+{
+ struct sas_task *task = isci_request_access_task(request);
+ int ret;
+
+ dev_dbg(&request->isci_host->pdev->dev,
+ "%s: request = %p, sge_address = %p\n",
+ __func__,
+ request,
+ sge_address);
+
+ if (task->data_dir == PCI_DMA_NONE)
+ return 0;
+
+ /* the case where num_scatter == 0 is special, in that
+ * task->scatter is the actual buffer address, not an sgl.
+ * so we return total_xfer_len here.
+ */
+ if (task->num_scatter == 0)
+ ret = task->total_xfer_len;
+ else
+ ret = sg_dma_len((struct scatterlist *)sge_address);
+
+ dev_dbg(&request->isci_host->pdev->dev,
+ "%s: len = %d\n",
+ __func__,
+ ret);
+
+ return ret;
+}
+
+
+/**
+ * isci_request_ssp_io_request_get_cdb_address() - This function is called by
+ * the sci core to retrieve the cdb address for a given request.
+ * @request: This parameter is the isci_request object.
+ *
+ * cdb address for specified request.
+ */
+void *isci_request_ssp_io_request_get_cdb_address(
+ struct isci_request *request)
+{
+ struct sas_task *task = isci_request_access_task(request);
+
+ dev_dbg(&request->isci_host->pdev->dev,
+ "%s: request->task->ssp_task.cdb = %p\n",
+ __func__,
+ task->ssp_task.cdb);
+ return task->ssp_task.cdb;
+}
+
+
+/**
+ * isci_request_ssp_io_request_get_cdb_length() - This function is called by
+ * the sci core to retrieve the cdb length for a given request.
+ * @request: This parameter is the isci_request object.
+ *
+ * cdb length for specified request.
+ */
+u32 isci_request_ssp_io_request_get_cdb_length(
+ struct isci_request *request)
+{
+ return 16;
+}
+
+
+/**
+ * isci_request_ssp_io_request_get_lun() - This function is called by the sci
+ * core to retrieve the lun for a given request.
+ * @request: This parameter is the isci_request object.
+ *
+ * lun for specified request.
+ */
+u32 isci_request_ssp_io_request_get_lun(
+ struct isci_request *request)
+{
+ struct sas_task *task = isci_request_access_task(request);
+
+#ifdef DEBUG
+ int i;
+
+ for (i = 0; i < 8; i++)
+ dev_dbg(&request->isci_host->pdev->dev,
+ "%s: request->task->ssp_task.LUN[%d] = %x\n",
+ __func__, i, request->task->ssp_task.LUN[i]);
+
+#endif
+
+ return task->ssp_task.LUN[0];
+}
+
+
+/**
+ * isci_request_ssp_io_request_get_task_attribute() - This function is called
+ * by the sci core to retrieve the task attribute for a given request.
+ * @request: This parameter is the isci_request object.
+ *
+ * task attribute for specified request.
+ */
+u32 isci_request_ssp_io_request_get_task_attribute(
+ struct isci_request *request)
+{
+ struct sas_task *task = isci_request_access_task(request);
+
+ dev_dbg(&request->isci_host->pdev->dev,
+ "%s: request->task->ssp_task.task_attr = %x\n",
+ __func__,
+ task->ssp_task.task_attr);
+
+ return task->ssp_task.task_attr;
+}
+
+
+/**
+ * isci_request_ssp_io_request_get_command_priority() - This function is called
+ * by the sci core to retrieve the command priority for a given request.
+ * @request: This parameter is the isci_request object.
+ *
+ * command priority for specified request.
+ */
+u32 isci_request_ssp_io_request_get_command_priority(
+ struct isci_request *request)
+{
+ struct sas_task *task = isci_request_access_task(request);
+
+ dev_dbg(&request->isci_host->pdev->dev,
+ "%s: request->task->ssp_task.task_prio = %x\n",
+ __func__,
+ task->ssp_task.task_prio);
+
+ return task->ssp_task.task_prio;
+}
diff --git a/drivers/scsi/isci/request.h b/drivers/scsi/isci/request.h
new file mode 100644
index 0000000..5079d4a
--- /dev/null
+++ b/drivers/scsi/isci/request.h
@@ -0,0 +1,429 @@
+/*
+ * 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.
+ */
+
+#if !defined(_ISCI_REQUEST_H_)
+#define _ISCI_REQUEST_H_
+
+#include "isci.h"
+
+/**
+ * struct isci_request_status - This enum defines the possible states of an I/O
+ * request.
+ *
+ *
+ */
+enum isci_request_status {
+ unallocated = 0x00,
+ allocated = 0x01,
+ started = 0x02,
+ completed = 0x03,
+ aborting = 0x04,
+ aborted = 0x05,
+ terminating = 0x06
+};
+
+enum task_type {
+ io_task = 0,
+ tmf_task = 1
+};
+
+/**
+ * struct isci_request - This class represents the request object used to track
+ * IO, smp and TMF request internal. It wraps the SCIC request object.
+ *
+ *
+ */
+struct isci_request {
+
+ struct scic_sds_request *sci_request_handle;
+
+ enum isci_request_status status;
+ enum task_type ttype;
+ unsigned short io_tag;
+ bool complete_in_target;
+
+ union ttype_ptr_union {
+ struct sas_task *io_task_ptr; /* When ttype==io_task */
+ struct isci_tmf *tmf_task_ptr; /* When ttype==tmf_task */
+ } ttype_ptr;
+ struct isci_host *isci_host;
+ struct isci_remote_device *isci_device;
+ /* For use in the requests_to_{complete|abort} lists: */
+ struct list_head completed_node;
+ /* For use in the reqs_in_process list: */
+ struct list_head dev_node;
+ void *sci_request_mem_ptr;
+ spinlock_t state_lock;
+ dma_addr_t request_daddr;
+ dma_addr_t zero_scatter_daddr;
+
+ unsigned int num_sg_entries; /* returned by pci_alloc_sg */
+ unsigned int request_alloc_size; /* size of block from dma_pool_alloc */
+
+ /** Note: "io_request_completion" is completed in two different ways
+ * depending on whether this is a TMF or regular request.
+ * - TMF requests are completed in the thread that started them;
+ * - regular requests are completed in the request completion callback
+ * function.
+ * This difference in operation allows the aborter of a TMF request
+ * to be sure that once the TMF request completes, the I/O that the
+ * TMF was aborting is guaranteed to have completed.
+ */
+ struct completion *io_request_completion;
+};
+
+/**
+ * This function gets the status of the request object.
+ * @request: This parameter points to the isci_request object
+ *
+ * status of the object as a isci_request_status enum.
+ */
+static inline
+enum isci_request_status isci_request_get_state(
+ struct isci_request *isci_request)
+{
+ BUG_ON(isci_request == NULL);
+
+ /*probably a bad sign... */
+ if (isci_request->status == unallocated)
+ dev_warn(&isci_request->isci_host->pdev->dev,
+ "%s: isci_request->status == unallocated\n",
+ __func__);
+
+ return isci_request->status;
+}
+
+
+/**
+ * isci_request_change_state() - This function sets the status of the request
+ * object.
+ * @request: This parameter points to the isci_request object
+ * @status: This Parameter is the new status of the object
+ *
+ */
+static inline enum isci_request_status isci_request_change_state(
+ struct isci_request *isci_request,
+ enum isci_request_status status)
+{
+ enum isci_request_status old_state;
+ unsigned long flags;
+
+ dev_dbg(&isci_request->isci_host->pdev->dev,
+ "%s: isci_request = %p, state = 0x%x\n",
+ __func__,
+ isci_request,
+ status);
+
+ BUG_ON(isci_request == NULL);
+
+ spin_lock_irqsave(&isci_request->state_lock, flags);
+ old_state = isci_request->status;
+ isci_request->status = status;
+ spin_unlock_irqrestore(&isci_request->state_lock, flags);
+
+ return old_state;
+}
+
+/**
+ * isci_request_change_started_to_newstate() - This function sets the status of
+ * the request object.
+ * @request: This parameter points to the isci_request object
+ * @status: This Parameter is the new status of the object
+ *
+ * state previous to any change.
+ */
+static inline enum isci_request_status isci_request_change_started_to_newstate(
+ struct isci_request *isci_request,
+ struct completion *completion_ptr,
+ enum isci_request_status newstate)
+{
+ enum isci_request_status old_state;
+ unsigned long flags;
+
+ BUG_ON(isci_request == NULL);
+
+ spin_lock_irqsave(&isci_request->state_lock, flags);
+
+ old_state = isci_request->status;
+
+ if (old_state == started) {
+ BUG_ON(isci_request->io_request_completion != NULL);
+
+ isci_request->io_request_completion = completion_ptr;
+ isci_request->status = newstate;
+ }
+ spin_unlock_irqrestore(&isci_request->state_lock, flags);
+
+ dev_dbg(&isci_request->isci_host->pdev->dev,
+ "%s: isci_request = %p, old_state = 0x%x\n",
+ __func__,
+ isci_request,
+ old_state);
+
+ return old_state;
+}
+
+/**
+ * isci_request_change_started_to_aborted() - This function sets the status of
+ * the request object.
+ * @request: This parameter points to the isci_request object
+ * @completion_ptr: This parameter is saved as the kernel completion structure
+ * signalled when the old request completes.
+ *
+ * state previous to any change.
+ */
+static inline enum isci_request_status isci_request_change_started_to_aborted(
+ struct isci_request *isci_request,
+ struct completion *completion_ptr)
+{
+ return isci_request_change_started_to_newstate(
+ isci_request, completion_ptr, aborted
+ );
+}
+/**
+ * isci_request_free() - This function frees the request object.
+ * @isci_host: This parameter specifies the ISCI host object
+ * @isci_request: This parameter points to the isci_request object
+ *
+ */
+static inline void isci_request_free(
+ struct isci_host *isci_host,
+ struct isci_request *isci_request)
+{
+ BUG_ON(isci_request == NULL);
+
+ /* release the dma memory if we fail. */
+ dma_pool_free(isci_host->dma_pool, isci_request,
+ isci_request->request_daddr);
+}
+
+
+/* #define ISCI_REQUEST_VALIDATE_ACCESS
+ */
+
+#ifdef ISCI_REQUEST_VALIDATE_ACCESS
+
+static inline
+struct sas_task *isci_request_access_task(struct isci_request *isci_request)
+{
+ BUG_ON(isci_request->ttype != io_task);
+ return isci_request->ttype_ptr.io_task_ptr;
+}
+
+static inline
+struct isci_tmf *isci_request_access_tmf(struct isci_request *isci_request)
+{
+ BUG_ON(isci_request->ttype != tmf_task);
+ return isci_request->ttype_ptr.tmf_task_ptr;
+}
+
+#else /* not ISCI_REQUEST_VALIDATE_ACCESS */
+
+#define isci_request_access_task(RequestPtr) \
+ ((RequestPtr)->ttype_ptr.io_task_ptr)
+
+#define isci_request_access_tmf(RequestPtr) \
+ ((RequestPtr)->ttype_ptr.tmf_task_ptr)
+
+#endif /* not ISCI_REQUEST_VALIDATE_ACCESS */
+
+
+int isci_request_alloc_tmf(
+ struct isci_host *isci_host,
+ struct isci_tmf *isci_tmf,
+ struct isci_request **isci_request,
+ struct isci_remote_device *isci_device,
+ gfp_t gfp_flags);
+
+
+int isci_request_execute(
+ struct isci_host *isci_host,
+ struct sas_task *task,
+ struct isci_request **request,
+ gfp_t gfp_flags);
+
+/**
+ * isci_request_unmap_sgl() - This function unmaps the DMA address of a given
+ * sgl
+ * @request: This parameter points to the isci_request object
+ * @*pdev: This Parameter is the pci_device struct for the controller
+ *
+ */
+static inline void isci_request_unmap_sgl(
+ struct isci_request *request,
+ struct pci_dev *pdev)
+{
+ struct sas_task *task = isci_request_access_task(request);
+
+ dev_dbg(&request->isci_host->pdev->dev,
+ "%s: request = %p, task = %p,\n"
+ "task->data_dir = %d, is_sata = %d\n ",
+ __func__,
+ request,
+ task,
+ task->data_dir,
+ sas_protocol_ata(task->task_proto));
+
+ if ((task->data_dir != PCI_DMA_NONE) &&
+ !sas_protocol_ata(task->task_proto)) {
+ if (task->num_scatter == 0)
+ /* 0 indicates a single dma address */
+ dma_unmap_single(
+ &pdev->dev,
+ request->zero_scatter_daddr,
+ task->total_xfer_len,
+ task->data_dir
+ );
+
+ else /* unmap the sgl dma addresses */
+ dma_unmap_sg(
+ &pdev->dev,
+ task->scatter,
+ request->num_sg_entries,
+ task->data_dir
+ );
+ }
+}
+
+
+void isci_request_io_request_complete(
+ struct isci_host *isci_host,
+ struct isci_request *request,
+ enum sci_io_status completion_status);
+
+u32 isci_request_io_request_get_transfer_length(
+ struct isci_request *request);
+
+SCI_IO_REQUEST_DATA_DIRECTION isci_request_io_request_get_data_direction(
+ struct isci_request *request);
+
+/**
+ * isci_request_io_request_get_next_sge() - This function is called by the sci
+ * core to retrieve the next sge for a given request.
+ * @request: This parameter is the isci_request object.
+ * @current_sge_address: This parameter is the last sge retrieved by the sci
+ * core for this request.
+ *
+ * pointer to the next sge for specified request.
+ */
+static inline void *isci_request_io_request_get_next_sge(
+ struct isci_request *request,
+ void *current_sge_address)
+{
+ struct sas_task *task = isci_request_access_task(request);
+ void *ret = NULL;
+
+ dev_dbg(&request->isci_host->pdev->dev,
+ "%s: request = %p, "
+ "current_sge_address = %p, "
+ "num_scatter = %d\n",
+ __func__,
+ request,
+ current_sge_address,
+ task->num_scatter);
+
+ if (!current_sge_address) /* First time through.. */
+ ret = task->scatter; /* always task->scatter */
+ else if (task->num_scatter == 0) /* Next element, if num_scatter == 0 */
+ ret = NULL; /* there is only one element. */
+ else
+ ret = sg_next(current_sge_address); /* sg_next returns NULL
+ * for the last element
+ */
+
+ dev_dbg(&request->isci_host->pdev->dev,
+ "%s: next sge address = %p\n",
+ __func__,
+ ret);
+
+ return ret;
+}
+
+dma_addr_t isci_request_sge_get_address_field(
+ struct isci_request *request,
+ void *sge_address);
+
+u32 isci_request_sge_get_length_field(
+ struct isci_request *request,
+ void *sge_address);
+
+void *isci_request_ssp_io_request_get_cdb_address(
+ struct isci_request *request);
+
+u32 isci_request_ssp_io_request_get_cdb_length(
+ struct isci_request *request);
+
+u32 isci_request_ssp_io_request_get_lun(
+ struct isci_request *request);
+
+u32 isci_request_ssp_io_request_get_task_attribute(
+ struct isci_request *request);
+
+u32 isci_request_ssp_io_request_get_command_priority(
+ struct isci_request *request);
+
+
+
+
+
+void isci_terminate_pending_requests(
+ struct isci_host *isci_host,
+ struct isci_remote_device *isci_device,
+ enum isci_request_status new_request_state);
+
+
+
+
+#endif /* !defined(_ISCI_REQUEST_H_) */
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