- 根目录:
- drivers
- scsi
- isci
- request.h
/*
* 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 "scu_task_context.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
};
enum sci_request_protocol {
SCIC_NO_PROTOCOL,
SCIC_SMP_PROTOCOL,
SCIC_SSP_PROTOCOL,
SCIC_STP_PROTOCOL
}; /* XXX remove me, use sas_task.{dev|task_proto} instead */;
/**
* isci_stp_request - extra request infrastructure to handle pio/atapi protocol
* @pio_len - number of bytes requested at PIO setup
* @status - pio setup ending status value to tell us if we need
* to wait for another fis or if the transfer is complete. Upon
* receipt of a d2h fis this will be the status field of that fis.
* @sgl - track pio transfer progress as we iterate through the sgl
* @device_cdb_len - atapi device advertises it's transfer constraints at setup
*/
struct isci_stp_request {
u32 pio_len;
u8 status;
struct isci_stp_pio_sgl {
int index;
u8 set;
u32 offset;
} sgl;
u32 device_cdb_len;
};
struct isci_request {
enum isci_request_status status;
#define IREQ_COMPLETE_IN_TARGET 0
#define IREQ_TERMINATED 1
#define IREQ_TMF 2
#define IREQ_ACTIVE 3
unsigned long flags;
/* XXX kill ttype and ttype_ptr, allocate full sas_task */
enum task_type ttype;
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;
/* 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;
/* 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.
*
* XXX kill io_request_completion
*/
struct completion *io_request_completion;
struct sci_base_state_machine sm;
struct isci_host *owning_controller;
struct isci_remote_device *target_device;
u16 io_tag;
enum sci_request_protocol protocol;
u32 scu_status; /* hardware result */
u32 sci_status; /* upper layer disposition */
u32 post_context;
struct scu_task_context *tc;
/* could be larger with sg chaining */
#define SCU_SGL_SIZE ((SCI_MAX_SCATTER_GATHER_ELEMENTS + 1) / 2)
struct scu_sgl_element_pair sg_table[SCU_SGL_SIZE] __attribute__ ((aligned(32)));
/* This field is a pointer to the stored rx frame data. It is used in
* STP internal requests and SMP response frames. If this field is
* non-NULL the saved frame must be released on IO request completion.
*/
u32 saved_rx_frame_index;
union {
struct {
union {
struct ssp_cmd_iu cmd;
struct ssp_task_iu tmf;
};
union {
struct ssp_response_iu rsp;
u8 rsp_buf[SSP_RESP_IU_MAX_SIZE];
};
} ssp;
struct {
struct isci_stp_request req;
struct host_to_dev_fis cmd;
struct dev_to_host_fis rsp;
} stp;
};
};
static inline struct isci_request *to_ireq(struct isci_stp_request *stp_req)
{
struct isci_request *ireq;
ireq = container_of(stp_req, typeof(*ireq), stp.req);
return ireq;
}
/**
* enum sci_base_request_states - This enumeration depicts all the states for
* the common request state machine.
*
*
*/
enum sci_base_request_states {
/*
* Simply the initial state for the base request state machine.
*/
SCI_REQ_INIT,
/*
* This state indicates that the request has been constructed.
* This state is entered from the INITIAL state.
*/
SCI_REQ_CONSTRUCTED,
/*
* This state indicates that the request has been started. This state
* is entered from the CONSTRUCTED state.
*/
SCI_REQ_STARTED,
SCI_REQ_STP_UDMA_WAIT_TC_COMP,
SCI_REQ_STP_UDMA_WAIT_D2H,
SCI_REQ_STP_NON_DATA_WAIT_H2D,
SCI_REQ_STP_NON_DATA_WAIT_D2H,
SCI_REQ_STP_SOFT_RESET_WAIT_H2D_ASSERTED,
SCI_REQ_STP_SOFT_RESET_WAIT_H2D_DIAG,
SCI_REQ_STP_SOFT_RESET_WAIT_D2H,
/*
* While in this state the IO request object is waiting for the TC
* completion notification for the H2D Register FIS
*/
SCI_REQ_STP_PIO_WAIT_H2D,
/*
* While in this state the IO request object is waiting for either a
* PIO Setup FIS or a D2H register FIS. The type of frame received is
* based on the result of the prior frame and line conditions.
*/
SCI_REQ_STP_PIO_WAIT_FRAME,
/*
* While in this state the IO request object is waiting for a DATA
* frame from the device.
*/
SCI_REQ_STP_PIO_DATA_IN,
/*
* While in this state the IO request object is waiting to transmit
* the next data frame to the device.
*/
SCI_REQ_STP_PIO_DATA_OUT,
/*
* The AWAIT_TC_COMPLETION sub-state indicates that the started raw
* task management request is waiting for the transmission of the
* initial frame (i.e. command, task, etc.).
*/
SCI_REQ_TASK_WAIT_TC_COMP,
/*
* This sub-state indicates that the started task management request
* is waiting for the reception of an unsolicited frame
* (i.e. response IU).
*/
SCI_REQ_TASK_WAIT_TC_RESP,
/*
* This sub-state indicates that the started task management request
* is waiting for the reception of an unsolicited frame
* (i.e. response IU).
*/
SCI_REQ_SMP_WAIT_RESP,
/*
* The AWAIT_TC_COMPLETION sub-state indicates that the started SMP
* request is waiting for the transmission of the initial frame
* (i.e. command, task, etc.).
*/
SCI_REQ_SMP_WAIT_TC_COMP,
/*
* This state indicates that the request has completed.
* This state is entered from the STARTED state. This state is entered
* from the ABORTING state.
*/
SCI_REQ_COMPLETED,
/*
* This state indicates that the request is in the process of being
* terminated/aborted.
* This state is entered from the CONSTRUCTED state.
* This state is entered from the STARTED state.
*/
SCI_REQ_ABORTING,
/*
* Simply the final state for the base request state machine.
*/
SCI_REQ_FINAL,
};
enum sci_status sci_request_start(struct isci_request *ireq);
enum sci_status sci_io_request_terminate(struct isci_request *ireq);
enum sci_status
sci_io_request_event_handler(struct isci_request *ireq,
u32 event_code);
enum sci_status
sci_io_request_frame_handler(struct isci_request *ireq,
u32 frame_index);
enum sci_status
sci_task_request_terminate(struct isci_request *ireq);
extern enum sci_status
sci_request_complete(struct isci_request *ireq);
extern enum sci_status
sci_io_request_tc_completion(struct isci_request *ireq, u32 code);
/* XXX open code in caller */
static inline dma_addr_t
sci_io_request_get_dma_addr(struct isci_request *ireq, void *virt_addr)
{
char *requested_addr = (char *)virt_addr;
char *base_addr = (char *)ireq;
BUG_ON(requested_addr < base_addr);
BUG_ON((requested_addr - base_addr) >= sizeof(*ireq));
return ireq->request_daddr + (requested_addr - base_addr);
}
/**
* 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);
}
#define isci_request_access_task(req) ((req)->ttype_ptr.io_task_ptr)
#define isci_request_access_tmf(req) ((req)->ttype_ptr.tmf_task_ptr)
struct isci_request *isci_tmf_request_from_tag(struct isci_host *ihost,
struct isci_tmf *isci_tmf,
u16 tag);
int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *idev,
struct sas_task *task, u16 tag);
void isci_terminate_pending_requests(struct isci_host *ihost,
struct isci_remote_device *idev);
enum sci_status
sci_task_request_construct(struct isci_host *ihost,
struct isci_remote_device *idev,
u16 io_tag,
struct isci_request *ireq);
enum sci_status
sci_task_request_construct_ssp(struct isci_request *ireq);
enum sci_status
sci_task_request_construct_sata(struct isci_request *ireq);
void sci_smp_request_copy_response(struct isci_request *ireq);
static inline int isci_task_is_ncq_recovery(struct sas_task *task)
{
return (sas_protocol_ata(task->task_proto) &&
task->ata_task.fis.command == ATA_CMD_READ_LOG_EXT &&
task->ata_task.fis.lbal == ATA_LOG_SATA_NCQ);
}
#endif /* !defined(_ISCI_REQUEST_H_) */