/*
* 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.
*/
#ifndef _ISCI_TASK_H_
#define _ISCI_TASK_H_
#include <scsi/sas_ata.h>
#include "host.h"
struct isci_request;
/**
* enum isci_tmf_cb_state - This enum defines the possible states in which the
* TMF callback function is invoked during the TMF execution process.
*
*
*/
enum isci_tmf_cb_state {
isci_tmf_init_state = 0,
isci_tmf_started,
isci_tmf_timed_out
};
/**
* enum isci_tmf_function_codes - This enum defines the possible preparations
* of task management requests.
*
*
*/
enum isci_tmf_function_codes {
isci_tmf_func_none = 0,
isci_tmf_ssp_task_abort = TMF_ABORT_TASK,
isci_tmf_ssp_lun_reset = TMF_LU_RESET,
isci_tmf_sata_srst_high = TMF_LU_RESET + 0x100, /* Non SCSI */
isci_tmf_sata_srst_low = TMF_LU_RESET + 0x101 /* Non SCSI */
};
/**
* struct isci_tmf - This class represents the task management object which
* acts as an interface to libsas for processing task management requests
*
*
*/
struct isci_tmf {
struct completion *complete;
enum sas_protocol proto;
union {
struct ssp_response_iu resp_iu;
struct dev_to_host_fis d2h_fis;
} resp;
unsigned char lun[8];
u16 io_tag;
struct isci_remote_device *device;
enum isci_tmf_function_codes tmf_code;
int status;
struct isci_timer *timeout_timer;
/* The optional callback function allows the user process to
* track the TMF transmit / timeout conditions.
*/
void (*cb_state_func)(
enum isci_tmf_cb_state,
struct isci_tmf *, void *);
void *cb_data;
};
static inline void isci_print_tmf(struct isci_tmf *tmf)
{
if (SAS_PROTOCOL_SATA == tmf->proto)
dev_dbg(&tmf->device->isci_port->isci_host->pdev->dev,
"%s: status = %x\n"
"tmf->resp.d2h_fis.status = %x\n"
"tmf->resp.d2h_fis.error = %x\n",
__func__,
tmf->status,
tmf->resp.d2h_fis.status,
tmf->resp.d2h_fis.error);
else
dev_dbg(&tmf->device->isci_port->isci_host->pdev->dev,
"%s: status = %x\n"
"tmf->resp.resp_iu.data_present = %x\n"
"tmf->resp.resp_iu.status = %x\n"
"tmf->resp.resp_iu.data_length = %x\n"
"tmf->resp.resp_iu.data[0] = %x\n"
"tmf->resp.resp_iu.data[1] = %x\n"
"tmf->resp.resp_iu.data[2] = %x\n"
"tmf->resp.resp_iu.data[3] = %x\n",
__func__,
tmf->status,
tmf->resp.resp_iu.datapres,
tmf->resp.resp_iu.status,
be32_to_cpu(tmf->resp.resp_iu.response_data_len),
tmf->resp.resp_iu.resp_data[0],
tmf->resp.resp_iu.resp_data[1],
tmf->resp.resp_iu.resp_data[2],
tmf->resp.resp_iu.resp_data[3]);
}
int isci_task_execute_task(
struct sas_task *task,
int num,
gfp_t gfp_flags);
int isci_task_abort_task(
struct sas_task *task);
int isci_task_abort_task_set(
struct domain_device *d_device,
u8 *lun);
int isci_task_clear_aca(
struct domain_device *d_device,
u8 *lun);
int isci_task_clear_task_set(
struct domain_device *d_device,
u8 *lun);
int isci_task_query_task(
struct sas_task *task);
int isci_task_lu_reset(
struct domain_device *d_device,
u8 *lun);
int isci_task_clear_nexus_port(
struct asd_sas_port *port);
int isci_task_clear_nexus_ha(
struct sas_ha_struct *ha);
int isci_task_I_T_nexus_reset(
struct domain_device *d_device);
void isci_task_request_complete(
struct isci_host *isci_host,
struct isci_request *request,
enum sci_task_status completion_status);
u16 isci_task_ssp_request_get_io_tag_to_manage(
struct isci_request *request);
u8 isci_task_ssp_request_get_function(
struct isci_request *request);
void *isci_task_ssp_request_get_response_data_address(
struct isci_request *request);
u32 isci_task_ssp_request_get_response_data_length(
struct isci_request *request);
int isci_queuecommand(
struct scsi_cmnd *scsi_cmd,
void (*donefunc)(struct scsi_cmnd *));
int isci_bus_reset_handler(struct scsi_cmnd *cmd);
void isci_task_build_tmf(
struct isci_tmf *tmf,
struct isci_remote_device *isci_device,
enum isci_tmf_function_codes code,
void (*tmf_sent_cb)(enum isci_tmf_cb_state,
struct isci_tmf *,
void *),
void *cb_data);
int isci_task_execute_tmf(
struct isci_host *isci_host,
struct isci_tmf *tmf,
unsigned long timeout_ms);
/**
* enum isci_completion_selection - This enum defines the possible actions to
* take with respect to a given request's notification back to libsas.
*
*
*/
enum isci_completion_selection {
isci_perform_normal_io_completion, /* Normal notify (task_done) */
isci_perform_aborted_io_completion, /* No notification. */
isci_perform_error_io_completion /* Use sas_task_abort */
};
static inline void isci_set_task_doneflags(
struct sas_task *task)
{
/* Since no futher action will be taken on this task,
* make sure to mark it complete from the lldd perspective.
*/
task->task_state_flags |= SAS_TASK_STATE_DONE;
task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
}
/**
* isci_task_all_done() - This function clears the task bits to indicate the
* LLDD is done with the task.
*
*
*/
static inline void isci_task_all_done(
struct sas_task *task)
{
unsigned long flags;
/* Since no futher action will be taken on this task,
* make sure to mark it complete from the lldd perspective.
*/
spin_lock_irqsave(&task->task_state_lock, flags);
isci_set_task_doneflags(task);
spin_unlock_irqrestore(&task->task_state_lock, flags);
}
/**
* isci_task_set_completion_status() - This function sets the completion status
* for the request.
* @task: 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.
*
* @return The new notification mode for the request.
*/
static inline enum isci_completion_selection
isci_task_set_completion_status(
struct sas_task *task,
enum service_response response,
enum exec_status status,
enum isci_completion_selection task_notification_selection)
{
unsigned long flags;
spin_lock_irqsave(&task->task_state_lock, flags);
/* If a device reset is being indicated, make sure the I/O
* is in the error path.
*/
if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET) {
/* Fail the I/O to make sure it goes into the error path. */
response = SAS_TASK_UNDELIVERED;
status = SAM_STAT_TASK_ABORTED;
task_notification_selection = isci_perform_error_io_completion;
}
task->task_status.resp = response;
task->task_status.stat = status;
switch (task_notification_selection) {
case isci_perform_aborted_io_completion:
/* This path can occur with task-managed requests as well as
* requests terminated because of LUN or device resets.
*/
/* Fall through to the normal case... */
case isci_perform_normal_io_completion:
/* Normal notification (task_done) */
isci_set_task_doneflags(task);
break;
default:
WARN_ONCE(1, "unknown task_notification_selection: %d\n",
task_notification_selection);
/* Fall through to the error case... */
case isci_perform_error_io_completion:
/* Use sas_task_abort */
/* Leave SAS_TASK_STATE_DONE clear
* Leave SAS_TASK_AT_INITIATOR set.
*/
break;
}
spin_unlock_irqrestore(&task->task_state_lock, flags);
return task_notification_selection;
}
/**
* isci_execpath_callback() - This function is called from the task
* execute path when the task needs to callback libsas about the submit-time
* task failure. The callback occurs either through the task's done function
* or through sas_task_abort. In the case of regular non-discovery SATA/STP I/O
* requests, libsas takes the host lock before calling execute task. Therefore
* in this situation the host lock must be managed before calling the func.
*
* @ihost: This parameter is the controller to which the I/O request was sent.
* @task: This parameter is the I/O request.
* @func: This parameter is the function to call in the correct context.
* @status: This parameter is the status code for the completed task.
*
*/
static inline void isci_execpath_callback(struct isci_host *ihost,
struct sas_task *task,
void (*func)(struct sas_task *))
{
struct domain_device *dev = task->dev;
if (dev_is_sata(dev) && task->uldd_task) {
unsigned long flags;
/* Since we are still in the submit path, and since
* libsas takes the host lock on behalf of SATA
* devices before I/O starts (in the non-discovery case),
* we need to unlock before we can call the callback function.
*/
raw_local_irq_save(flags);
spin_unlock(dev->sata_dev.ap->lock);
func(task);
spin_lock(dev->sata_dev.ap->lock);
raw_local_irq_restore(flags);
} else
func(task);
}
#endif /* !defined(_SCI_TASK_H_) */
