mirror of https://gitee.com/openkylin/linux.git
430 lines
12 KiB
C
430 lines
12 KiB
C
/*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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* The full GNU General Public License is included in this distribution
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* in the file called LICENSE.GPL.
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*
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* BSD LICENSE
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*
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* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#if !defined(_ISCI_REQUEST_H_)
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#define _ISCI_REQUEST_H_
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#include "isci.h"
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/**
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* struct isci_request_status - This enum defines the possible states of an I/O
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* request.
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*
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*
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*/
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enum isci_request_status {
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unallocated = 0x00,
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allocated = 0x01,
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started = 0x02,
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completed = 0x03,
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aborting = 0x04,
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aborted = 0x05,
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terminating = 0x06,
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dead = 0x07
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};
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enum task_type {
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io_task = 0,
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tmf_task = 1
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};
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/**
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* struct isci_request - This class represents the request object used to track
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* IO, smp and TMF request internal. It wraps the SCIC request object.
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*
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*
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*/
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struct isci_request {
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struct scic_sds_request *sci_request_handle;
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enum isci_request_status status;
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enum task_type ttype;
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unsigned short io_tag;
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bool complete_in_target;
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union ttype_ptr_union {
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struct sas_task *io_task_ptr; /* When ttype==io_task */
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struct isci_tmf *tmf_task_ptr; /* When ttype==tmf_task */
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} ttype_ptr;
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struct isci_host *isci_host;
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struct isci_remote_device *isci_device;
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/* For use in the requests_to_{complete|abort} lists: */
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struct list_head completed_node;
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/* For use in the reqs_in_process list: */
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struct list_head dev_node;
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void *sci_request_mem_ptr;
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spinlock_t state_lock;
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dma_addr_t request_daddr;
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dma_addr_t zero_scatter_daddr;
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unsigned int num_sg_entries; /* returned by pci_alloc_sg */
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unsigned int request_alloc_size; /* size of block from dma_pool_alloc */
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/** Note: "io_request_completion" is completed in two different ways
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* depending on whether this is a TMF or regular request.
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* - TMF requests are completed in the thread that started them;
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* - regular requests are completed in the request completion callback
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* function.
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* This difference in operation allows the aborter of a TMF request
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* to be sure that once the TMF request completes, the I/O that the
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* TMF was aborting is guaranteed to have completed.
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*/
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struct completion *io_request_completion;
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};
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/**
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* This function gets the status of the request object.
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* @request: This parameter points to the isci_request object
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*
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* status of the object as a isci_request_status enum.
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*/
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static inline
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enum isci_request_status isci_request_get_state(
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struct isci_request *isci_request)
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{
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BUG_ON(isci_request == NULL);
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/*probably a bad sign... */
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if (isci_request->status == unallocated)
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dev_warn(&isci_request->isci_host->pdev->dev,
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"%s: isci_request->status == unallocated\n",
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__func__);
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return isci_request->status;
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}
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/**
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* isci_request_change_state() - This function sets the status of the request
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* object.
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* @request: This parameter points to the isci_request object
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* @status: This Parameter is the new status of the object
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*
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*/
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static inline enum isci_request_status isci_request_change_state(
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struct isci_request *isci_request,
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enum isci_request_status status)
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{
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enum isci_request_status old_state;
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unsigned long flags;
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dev_dbg(&isci_request->isci_host->pdev->dev,
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"%s: isci_request = %p, state = 0x%x\n",
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__func__,
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isci_request,
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status);
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BUG_ON(isci_request == NULL);
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spin_lock_irqsave(&isci_request->state_lock, flags);
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old_state = isci_request->status;
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isci_request->status = status;
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spin_unlock_irqrestore(&isci_request->state_lock, flags);
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return old_state;
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}
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/**
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* isci_request_change_started_to_newstate() - This function sets the status of
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* the request object.
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* @request: This parameter points to the isci_request object
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* @status: This Parameter is the new status of the object
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*
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* state previous to any change.
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*/
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static inline enum isci_request_status isci_request_change_started_to_newstate(
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struct isci_request *isci_request,
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struct completion *completion_ptr,
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enum isci_request_status newstate)
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{
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enum isci_request_status old_state;
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unsigned long flags;
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BUG_ON(isci_request == NULL);
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spin_lock_irqsave(&isci_request->state_lock, flags);
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old_state = isci_request->status;
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if (old_state == started) {
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BUG_ON(isci_request->io_request_completion != NULL);
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isci_request->io_request_completion = completion_ptr;
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isci_request->status = newstate;
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}
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spin_unlock_irqrestore(&isci_request->state_lock, flags);
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dev_dbg(&isci_request->isci_host->pdev->dev,
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"%s: isci_request = %p, old_state = 0x%x\n",
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__func__,
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isci_request,
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old_state);
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return old_state;
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}
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/**
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* isci_request_change_started_to_aborted() - This function sets the status of
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* the request object.
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* @request: This parameter points to the isci_request object
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* @completion_ptr: This parameter is saved as the kernel completion structure
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* signalled when the old request completes.
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*
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* state previous to any change.
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*/
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static inline enum isci_request_status isci_request_change_started_to_aborted(
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struct isci_request *isci_request,
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struct completion *completion_ptr)
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{
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return isci_request_change_started_to_newstate(
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isci_request, completion_ptr, aborted
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);
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}
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/**
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* isci_request_free() - This function frees the request object.
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* @isci_host: This parameter specifies the ISCI host object
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* @isci_request: This parameter points to the isci_request object
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*
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*/
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static inline void isci_request_free(
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struct isci_host *isci_host,
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struct isci_request *isci_request)
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{
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BUG_ON(isci_request == NULL);
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/* release the dma memory if we fail. */
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dma_pool_free(isci_host->dma_pool, isci_request,
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isci_request->request_daddr);
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}
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/* #define ISCI_REQUEST_VALIDATE_ACCESS
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*/
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#ifdef ISCI_REQUEST_VALIDATE_ACCESS
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static inline
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struct sas_task *isci_request_access_task(struct isci_request *isci_request)
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{
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BUG_ON(isci_request->ttype != io_task);
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return isci_request->ttype_ptr.io_task_ptr;
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}
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static inline
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struct isci_tmf *isci_request_access_tmf(struct isci_request *isci_request)
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{
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BUG_ON(isci_request->ttype != tmf_task);
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return isci_request->ttype_ptr.tmf_task_ptr;
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}
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#else /* not ISCI_REQUEST_VALIDATE_ACCESS */
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#define isci_request_access_task(RequestPtr) \
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((RequestPtr)->ttype_ptr.io_task_ptr)
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#define isci_request_access_tmf(RequestPtr) \
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((RequestPtr)->ttype_ptr.tmf_task_ptr)
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#endif /* not ISCI_REQUEST_VALIDATE_ACCESS */
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int isci_request_alloc_tmf(
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struct isci_host *isci_host,
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struct isci_tmf *isci_tmf,
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struct isci_request **isci_request,
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struct isci_remote_device *isci_device,
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gfp_t gfp_flags);
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int isci_request_execute(
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struct isci_host *isci_host,
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struct sas_task *task,
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struct isci_request **request,
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gfp_t gfp_flags);
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/**
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* isci_request_unmap_sgl() - This function unmaps the DMA address of a given
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* sgl
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* @request: This parameter points to the isci_request object
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* @*pdev: This Parameter is the pci_device struct for the controller
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*
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*/
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static inline void isci_request_unmap_sgl(
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struct isci_request *request,
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struct pci_dev *pdev)
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{
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struct sas_task *task = isci_request_access_task(request);
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dev_dbg(&request->isci_host->pdev->dev,
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"%s: request = %p, task = %p,\n"
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"task->data_dir = %d, is_sata = %d\n ",
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__func__,
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request,
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task,
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task->data_dir,
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sas_protocol_ata(task->task_proto));
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if ((task->data_dir != PCI_DMA_NONE) &&
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!sas_protocol_ata(task->task_proto)) {
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if (task->num_scatter == 0)
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/* 0 indicates a single dma address */
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dma_unmap_single(
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&pdev->dev,
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request->zero_scatter_daddr,
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task->total_xfer_len,
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task->data_dir
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);
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else /* unmap the sgl dma addresses */
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dma_unmap_sg(
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&pdev->dev,
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task->scatter,
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request->num_sg_entries,
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task->data_dir
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);
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}
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}
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void isci_request_io_request_complete(
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struct isci_host *isci_host,
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struct isci_request *request,
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enum sci_io_status completion_status);
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u32 isci_request_io_request_get_transfer_length(
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struct isci_request *request);
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enum dma_data_direction isci_request_io_request_get_data_direction(struct isci_request *req);
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/**
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* isci_request_io_request_get_next_sge() - This function is called by the sci
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* core to retrieve the next sge for a given request.
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* @request: This parameter is the isci_request object.
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* @current_sge_address: This parameter is the last sge retrieved by the sci
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* core for this request.
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*
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* pointer to the next sge for specified request.
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*/
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static inline void *isci_request_io_request_get_next_sge(
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struct isci_request *request,
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void *current_sge_address)
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{
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struct sas_task *task = isci_request_access_task(request);
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void *ret = NULL;
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dev_dbg(&request->isci_host->pdev->dev,
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"%s: request = %p, "
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"current_sge_address = %p, "
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"num_scatter = %d\n",
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__func__,
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request,
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current_sge_address,
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task->num_scatter);
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if (!current_sge_address) /* First time through.. */
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ret = task->scatter; /* always task->scatter */
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else if (task->num_scatter == 0) /* Next element, if num_scatter == 0 */
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ret = NULL; /* there is only one element. */
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else
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ret = sg_next(current_sge_address); /* sg_next returns NULL
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* for the last element
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*/
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dev_dbg(&request->isci_host->pdev->dev,
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"%s: next sge address = %p\n",
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__func__,
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ret);
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return ret;
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}
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dma_addr_t isci_request_sge_get_address_field(
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struct isci_request *request,
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void *sge_address);
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u32 isci_request_sge_get_length_field(
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struct isci_request *request,
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void *sge_address);
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void *isci_request_ssp_io_request_get_cdb_address(
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struct isci_request *request);
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u32 isci_request_ssp_io_request_get_cdb_length(
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struct isci_request *request);
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u32 isci_request_ssp_io_request_get_lun(
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struct isci_request *request);
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u32 isci_request_ssp_io_request_get_task_attribute(
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struct isci_request *request);
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u32 isci_request_ssp_io_request_get_command_priority(
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struct isci_request *request);
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void isci_terminate_pending_requests(
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struct isci_host *isci_host,
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struct isci_remote_device *isci_device,
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enum isci_request_status new_request_state);
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#endif /* !defined(_ISCI_REQUEST_H_) */
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