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linux-next/drivers/scsi/isci/remote_device.h
Dan Williams b50102d3e9 [SCSI] isci: atapi support 
Based on original implementation from Jiangbi Liu and Maciej Trela.

ATAPI transfers happen in two-to-three stages.  The two stage atapi
commands are those that include a dma data transfer.  The data transfer
portion of these operations is handled by the hardware packet-dma
acceleration.  The three-stage commands do not have a data transfer and
are handled without hardware assistance in raw frame mode.

stage1: transmit host-to-device fis to notify the device of an incoming
atapi cdb.  Upon reception of the pio-setup-fis repost the task_context
to perform the dma transfer of the cdb+data (go to stage3), or repost
the task_context to transmit the cdb as a raw frame (go to stage 2).

stage2: wait for hardware notification of the cdb transmission and then
go to stage 3.

stage3: wait for the arrival of the terminating device-to-host fis and
terminate the command.

To keep the implementation simple we only support ATAPI packet-dma
protocol (for commands with data) to avoid needing to handle the data
transfer manually (like we do for SATA-PIO).  This may affect
compatibility for a small number of devices (see
ATA_HORKAGE_ATAPI_MOD16_DMA).

If the data-transfer underruns, or encounters an error the
device-to-host fis is expected to arrive in the unsolicited frame queue
to pass to libata for disposition.  However, in the DONE_UNEXP_FIS (data
underrun) case it appears we need to craft a response.  In the
DONE_REG_ERR case we do receive the UF and propagate it to libsas.

Signed-off-by: Maciej Trela <maciej.trela@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2011-10-02 13:20:03 -05:00

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/*
* 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_REMOTE_DEVICE_H_
#define _ISCI_REMOTE_DEVICE_H_
#include <scsi/libsas.h>
#include <linux/kref.h>
#include "scu_remote_node_context.h"
#include "remote_node_context.h"
#include "port.h"
enum sci_remote_device_not_ready_reason_code {
SCIC_REMOTE_DEVICE_NOT_READY_START_REQUESTED,
SCIC_REMOTE_DEVICE_NOT_READY_STOP_REQUESTED,
SCIC_REMOTE_DEVICE_NOT_READY_SATA_REQUEST_STARTED,
SCIC_REMOTE_DEVICE_NOT_READY_SATA_SDB_ERROR_FIS_RECEIVED,
SCIC_REMOTE_DEVICE_NOT_READY_SMP_REQUEST_STARTED,
SCIC_REMOTE_DEVICE_NOT_READY_REASON_CODE_MAX
};
/**
* isci_remote_device - isci representation of a sas expander / end point
* @device_port_width: hw setting for number of simultaneous connections
* @connection_rate: per-taskcontext connection rate for this device
* @working_request: SATA requests have no tag we for unaccelerated
* protocols we need a method to associate unsolicited
* frames with a pending request
*/
struct isci_remote_device {
#define IDEV_START_PENDING 0
#define IDEV_STOP_PENDING 1
#define IDEV_ALLOCATED 2
#define IDEV_EH 3
#define IDEV_GONE 4
#define IDEV_IO_READY 5
#define IDEV_IO_NCQERROR 6
unsigned long flags;
struct kref kref;
struct isci_port *isci_port;
struct domain_device *domain_dev;
struct list_head node;
struct list_head reqs_in_process;
struct sci_base_state_machine sm;
u32 device_port_width;
enum sas_linkrate connection_rate;
bool is_direct_attached;
struct isci_port *owning_port;
struct sci_remote_node_context rnc;
/* XXX unify with device reference counting and delete */
u32 started_request_count;
struct isci_request *working_request;
u32 not_ready_reason;
};
#define ISCI_REMOTE_DEVICE_START_TIMEOUT 5000
/* device reference routines must be called under sci_lock */
static inline struct isci_remote_device *isci_lookup_device(struct domain_device *dev)
{
struct isci_remote_device *idev = dev->lldd_dev;
if (idev && !test_bit(IDEV_GONE, &idev->flags)) {
kref_get(&idev->kref);
return idev;
}
return NULL;
}
void isci_remote_device_release(struct kref *kref);
static inline void isci_put_device(struct isci_remote_device *idev)
{
if (idev)
kref_put(&idev->kref, isci_remote_device_release);
}
enum sci_status isci_remote_device_stop(struct isci_host *ihost,
struct isci_remote_device *idev);
void isci_remote_device_nuke_requests(struct isci_host *ihost,
struct isci_remote_device *idev);
void isci_remote_device_gone(struct domain_device *domain_dev);
int isci_remote_device_found(struct domain_device *domain_dev);
bool isci_device_is_reset_pending(struct isci_host *ihost,
struct isci_remote_device *idev);
void isci_device_clear_reset_pending(struct isci_host *ihost,
struct isci_remote_device *idev);
/**
* sci_remote_device_stop() - This method will stop both transmission and
* reception of link activity for the supplied remote device. This method
* disables normal IO requests from flowing through to the remote device.
* @remote_device: This parameter specifies the device to be stopped.
* @timeout: This parameter specifies the number of milliseconds in which the
* stop operation should complete.
*
* An indication of whether the device was successfully stopped. SCI_SUCCESS
* This value is returned if the transmission and reception for the device was
* successfully stopped.
*/
enum sci_status sci_remote_device_stop(
struct isci_remote_device *idev,
u32 timeout);
/**
* sci_remote_device_reset() - This method will reset the device making it
* ready for operation. This method must be called anytime the device is
* reset either through a SMP phy control or a port hard reset request.
* @remote_device: This parameter specifies the device to be reset.
*
* This method does not actually cause the device hardware to be reset. This
* method resets the software object so that it will be operational after a
* device hardware reset completes. An indication of whether the device reset
* was accepted. SCI_SUCCESS This value is returned if the device reset is
* started.
*/
enum sci_status sci_remote_device_reset(
struct isci_remote_device *idev);
/**
* sci_remote_device_reset_complete() - This method informs the device object
* that the reset operation is complete and the device can resume operation
* again.
* @remote_device: This parameter specifies the device which is to be informed
* of the reset complete operation.
*
* An indication that the device is resuming operation. SCI_SUCCESS the device
* is resuming operation.
*/
enum sci_status sci_remote_device_reset_complete(
struct isci_remote_device *idev);
/**
* enum sci_remote_device_states - This enumeration depicts all the states
* for the common remote device state machine.
*
*
*/
enum sci_remote_device_states {
/**
* Simply the initial state for the base remote device state machine.
*/
SCI_DEV_INITIAL,
/**
* This state indicates that the remote device has successfully been
* stopped. In this state no new IO operations are permitted.
* This state is entered from the INITIAL state.
* This state is entered from the STOPPING state.
*/
SCI_DEV_STOPPED,
/**
* This state indicates the the remote device is in the process of
* becoming ready (i.e. starting). In this state no new IO operations
* are permitted.
* This state is entered from the STOPPED state.
*/
SCI_DEV_STARTING,
/**
* This state indicates the remote device is now ready. Thus, the user
* is able to perform IO operations on the remote device.
* This state is entered from the STARTING state.
*/
SCI_DEV_READY,
/**
* This is the idle substate for the stp remote device. When there are no
* active IO for the device it is is in this state.
*/
SCI_STP_DEV_IDLE,
/**
* This is the command state for for the STP remote device. This state is
* entered when the device is processing a non-NCQ command. The device object
* will fail any new start IO requests until this command is complete.
*/
SCI_STP_DEV_CMD,
/**
* This is the NCQ state for the STP remote device. This state is entered
* when the device is processing an NCQ reuqest. It will remain in this state
* so long as there is one or more NCQ requests being processed.
*/
SCI_STP_DEV_NCQ,
/**
* This is the NCQ error state for the STP remote device. This state is
* entered when an SDB error FIS is received by the device object while in the
* NCQ state. The device object will only accept a READ LOG command while in
* this state.
*/
SCI_STP_DEV_NCQ_ERROR,
/**
* This is the ATAPI error state for the STP ATAPI remote device.
* This state is entered when ATAPI device sends error status FIS
* without data while the device object is in CMD state.
* A suspension event is expected in this state.
* The device object will resume right away.
*/
SCI_STP_DEV_ATAPI_ERROR,
/**
* This is the READY substate indicates the device is waiting for the RESET task
* coming to be recovered from certain hardware specific error.
*/
SCI_STP_DEV_AWAIT_RESET,
/**
* This is the ready operational substate for the remote device. This is the
* normal operational state for a remote device.
*/
SCI_SMP_DEV_IDLE,
/**
* This is the suspended state for the remote device. This is the state that
* the device is placed in when a RNC suspend is received by the SCU hardware.
*/
SCI_SMP_DEV_CMD,
/**
* This state indicates that the remote device is in the process of
* stopping. In this state no new IO operations are permitted, but
* existing IO operations are allowed to complete.
* This state is entered from the READY state.
* This state is entered from the FAILED state.
*/
SCI_DEV_STOPPING,
/**
* This state indicates that the remote device has failed.
* In this state no new IO operations are permitted.
* This state is entered from the INITIALIZING state.
* This state is entered from the READY state.
*/
SCI_DEV_FAILED,
/**
* This state indicates the device is being reset.
* In this state no new IO operations are permitted.
* This state is entered from the READY state.
*/
SCI_DEV_RESETTING,
/**
* Simply the final state for the base remote device state machine.
*/
SCI_DEV_FINAL,
};
static inline struct isci_remote_device *rnc_to_dev(struct sci_remote_node_context *rnc)
{
struct isci_remote_device *idev;
idev = container_of(rnc, typeof(*idev), rnc);
return idev;
}
static inline bool dev_is_expander(struct domain_device *dev)
{
return dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV;
}
static inline void sci_remote_device_decrement_request_count(struct isci_remote_device *idev)
{
/* XXX delete this voodoo when converting to the top-level device
* reference count
*/
if (WARN_ONCE(idev->started_request_count == 0,
"%s: tried to decrement started_request_count past 0!?",
__func__))
/* pass */;
else
idev->started_request_count--;
}
enum sci_status sci_remote_device_frame_handler(
struct isci_remote_device *idev,
u32 frame_index);
enum sci_status sci_remote_device_event_handler(
struct isci_remote_device *idev,
u32 event_code);
enum sci_status sci_remote_device_start_io(
struct isci_host *ihost,
struct isci_remote_device *idev,
struct isci_request *ireq);
enum sci_status sci_remote_device_start_task(
struct isci_host *ihost,
struct isci_remote_device *idev,
struct isci_request *ireq);
enum sci_status sci_remote_device_complete_io(
struct isci_host *ihost,
struct isci_remote_device *idev,
struct isci_request *ireq);
enum sci_status sci_remote_device_suspend(
struct isci_remote_device *idev,
u32 suspend_type);
void sci_remote_device_post_request(
struct isci_remote_device *idev,
u32 request);
#endif /* !defined(_ISCI_REMOTE_DEVICE_H_) */
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