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linux/drivers/scsi/isci/remote_device.h
James Bottomley aa9f8328fc [SCSI] sas: unify the pointlessly separated enums sas_dev_type and sas_device_type 
These enums have been separate since the dawn of SAS, mainly because the
latter is a procotol only enum and the former includes additional state
for libsas.  The dichotomy causes endless confusion about which one you
should use where and leads to pointless warnings like this:

drivers/scsi/mvsas/mv_sas.c: In function 'mvs_update_phyinfo':
drivers/scsi/mvsas/mv_sas.c:1162:34: warning: comparison between 'enum sas_device_type' and 'enum sas_dev_type' [-Wenum-compare]

Fix by eliminating one of them.  The one kept is effectively the sas.h
one, but call it sas_device_type and make sure the enums are all
properly namespaced with the SAS_ prefix.

Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2013-05-10 07:47:52 -07:00

388 lines
14 KiB
C
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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_GONE 3
#define IDEV_IO_READY 4
#define IDEV_IO_NCQERROR 5
#define IDEV_RNC_LLHANG_ENABLED 6
#define IDEV_ABORT_PATH_ACTIVE 7
#define IDEV_ABORT_PATH_RESUME_PENDING 8
unsigned long flags;
struct kref kref;
struct isci_port *isci_port;
struct domain_device *domain_dev;
struct list_head node;
struct sci_base_state_machine sm;
u32 device_port_width;
enum sas_linkrate connection_rate;
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;
scics_sds_remote_node_context_callback abort_resume_cb;
void *abort_resume_cbparam;
};
#define ISCI_REMOTE_DEVICE_START_TIMEOUT 5000
/* device reference routines must be called under sci_lock */
static inline struct isci_remote_device *isci_get_device(
struct isci_remote_device *idev)
{
if (idev)
kref_get(&idev->kref);
return idev;
}
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);
/**
* 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.
* @SCI_DEV_INITIAL: Simply the initial state for the base remote device
* state machine.
*
* @SCI_DEV_STOPPED: 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_STARTING: 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_READY: 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_STP_DEV_IDLE: 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_CMD: 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_NCQ: 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_ERROR: 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_ATAPI_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_AWAIT_RESET: This is the READY substate indicates the
* device is waiting for the RESET task coming to be recovered from
* certain hardware specific error.
*
* @SCI_SMP_DEV_IDLE: This is the ready operational substate for the
* remote device. This is the normal operational state for a remote
* device.
*
* @SCI_SMP_DEV_CMD: 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_DEV_STOPPING: 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_FAILED: 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_RESETTING: 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_FINAL: Simply the final state for the base remote device
* state machine.
*/
#define REMOTE_DEV_STATES {\
C(DEV_INITIAL),\
C(DEV_STOPPED),\
C(DEV_STARTING),\
C(DEV_READY),\
C(STP_DEV_IDLE),\
C(STP_DEV_CMD),\
C(STP_DEV_NCQ),\
C(STP_DEV_NCQ_ERROR),\
C(STP_DEV_ATAPI_ERROR),\
C(STP_DEV_AWAIT_RESET),\
C(SMP_DEV_IDLE),\
C(SMP_DEV_CMD),\
C(DEV_STOPPING),\
C(DEV_FAILED),\
C(DEV_RESETTING),\
C(DEV_FINAL),\
}
#undef C
#define C(a) SCI_##a
enum sci_remote_device_states REMOTE_DEV_STATES;
#undef C
const char *dev_state_name(enum sci_remote_device_states state);
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 == SAS_EDGE_EXPANDER_DEVICE || dev->dev_type == SAS_FANOUT_EXPANDER_DEVICE;
}
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--;
}
void isci_dev_set_hang_detection_timeout(struct isci_remote_device *idev, u32 timeout);
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);
void sci_remote_device_post_request(
struct isci_remote_device *idev,
u32 request);
enum sci_status sci_remote_device_terminate_requests(
struct isci_remote_device *idev);
int isci_remote_device_is_safe_to_abort(
struct isci_remote_device *idev);
enum sci_status
sci_remote_device_abort_requests_pending_abort(
struct isci_remote_device *idev);
enum sci_status isci_remote_device_suspend(
struct isci_host *ihost,
struct isci_remote_device *idev);
enum sci_status sci_remote_device_resume(
struct isci_remote_device *idev,
scics_sds_remote_node_context_callback cb_fn,
void *cb_p);
enum sci_status isci_remote_device_resume_from_abort(
struct isci_host *ihost,
struct isci_remote_device *idev);
enum sci_status isci_remote_device_reset(
struct isci_host *ihost,
struct isci_remote_device *idev);
enum sci_status isci_remote_device_reset_complete(
struct isci_host *ihost,
struct isci_remote_device *idev);
enum sci_status isci_remote_device_suspend_terminate(
struct isci_host *ihost,
struct isci_remote_device *idev,
struct isci_request *ireq);
enum sci_status isci_remote_device_terminate_requests(
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,
enum sci_remote_node_suspension_reasons reason);
#endif /* !defined(_ISCI_REMOTE_DEVICE_H_) */
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