/*
* 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_REQUEST_H_
#define _ISCI_REQUEST_H_
#include "isci.h"
#include "host.h"
#include "scic_sds_request.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,
dead = 0x07
};
enum task_type {
io_task = 0,
tmf_task = 1
};
struct isci_request {
enum isci_request_status status;
enum task_type ttype;
unsigned short io_tag;
bool complete_in_target;
bool terminated;
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;
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 */
/** 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;
struct scic_sds_request sci;
};
static inline struct isci_request *sci_req_to_ireq(struct scic_sds_request *sci_req)
{
struct isci_request *ireq = container_of(sci_req, typeof(*ireq), sci);
return ireq;
}
/**
* 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;
spin_lock_irqsave(&isci_request->state_lock, flags);
old_state = isci_request->status;
if (old_state == started || old_state == aborting) {
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)
{
if (!isci_request)
return;
/* 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);
/**
* 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;
}
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_) */
