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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 _SCIC_SDS_REMOTE_NODE_CONTEXT_H_
#define _SCIC_SDS_REMOTE_NODE_CONTEXT_H_
/**
* This file contains the structures, constants, and prototypes associated with
* the remote node context in the silicon. It exists to model and manage
* the remote node context in the silicon.
*
*
*/
#include "isci.h"
/**
*
*
* This constant represents an invalid remote device id, it is used to program
* the STPDARNI register so the driver knows when it has received a SIGNATURE
* FIS from the SCU.
*/
#define SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX 0x0FFF
enum sci_remote_node_suspension_reasons {
SCI_HW_SUSPEND,
SCI_SW_SUSPEND_NORMAL,
SCI_SW_SUSPEND_LINKHANG_DETECT
};
#define SCI_SOFTWARE_SUSPEND_CMD SCU_CONTEXT_COMMAND_POST_RNC_SUSPEND_TX_RX
#define SCI_SOFTWARE_SUSPEND_EXPECTED_EVENT SCU_EVENT_TL_RNC_SUSPEND_TX_RX
struct isci_request;
struct isci_remote_device;
struct sci_remote_node_context;
typedef void (*scics_sds_remote_node_context_callback)(void *);
/**
* enum sci_remote_node_context_states
* @SCI_RNC_INITIAL initial state for a remote node context. On a resume
* request the remote node context will transition to the posting state.
*
* @SCI_RNC_POSTING: transition state that posts the RNi to the hardware. Once
* the RNC is posted the remote node context will be made ready.
*
* @SCI_RNC_INVALIDATING: transition state that will post an RNC invalidate to
* the hardware. Once the invalidate is complete the remote node context will
* transition to the posting state.
*
* @SCI_RNC_RESUMING: transition state that will post an RNC resume to the
* hardare. Once the event notification of resume complete is received the
* remote node context will transition to the ready state.
*
* @SCI_RNC_READY: state that the remote node context must be in to accept io
* request operations.
*
* @SCI_RNC_TX_SUSPENDED: state that the remote node context transitions to when
* it gets a TX suspend notification from the hardware.
*
* @SCI_RNC_TX_RX_SUSPENDED: state that the remote node context transitions to
* when it gets a TX RX suspend notification from the hardware.
*
* @SCI_RNC_AWAIT_SUSPENSION: wait state for the remote node context that waits
* for a suspend notification from the hardware. This state is entered when
* either there is a request to supend the remote node context or when there is
* a TC completion where the remote node will be suspended by the hardware.
*/
#define RNC_STATES {\
C(RNC_INITIAL),\
C(RNC_POSTING),\
C(RNC_INVALIDATING),\
C(RNC_RESUMING),\
C(RNC_READY),\
C(RNC_TX_SUSPENDED),\
C(RNC_TX_RX_SUSPENDED),\
C(RNC_AWAIT_SUSPENSION),\
}
#undef C
#define C(a) SCI_##a
enum scis_sds_remote_node_context_states RNC_STATES;
#undef C
const char *rnc_state_name(enum scis_sds_remote_node_context_states state);
/**
*
*
* This enumeration is used to define the end destination state for the remote
* node context.
*/
enum sci_remote_node_context_destination_state {
RNC_DEST_UNSPECIFIED,
RNC_DEST_READY,
RNC_DEST_FINAL,
RNC_DEST_SUSPENDED, /* Set when suspend during post/invalidate */
RNC_DEST_SUSPENDED_RESUME /* Set when a resume was done during posting
* or invalidating and already suspending.
*/
};
/**
* struct sci_remote_node_context - This structure contains the data
* associated with the remote node context object. The remote node context
* (RNC) object models the the remote device information necessary to manage
* the silicon RNC.
*/
struct sci_remote_node_context {
/**
* This field indicates the remote node index (RNI) associated with
* this RNC.
*/
u16 remote_node_index;
/**
* This field is the recored suspension type of the remote node
* context suspension.
*/
u32 suspend_type;
enum sci_remote_node_suspension_reasons suspend_reason;
u32 suspend_count;
/**
* This field is true if the remote node context is resuming from its current
* state. This can cause an automatic resume on receiving a suspension
* notification.
*/
enum sci_remote_node_context_destination_state destination_state;
/**
* This field contains the callback function that the user requested to be
* called when the requested state transition is complete.
*/
scics_sds_remote_node_context_callback user_callback;
/**
* This field contains the parameter that is called when the user requested
* state transition is completed.
*/
void *user_cookie;
/**
* This field contains the data for the object's state machine.
*/
struct sci_base_state_machine sm;
};
void sci_remote_node_context_construct(struct sci_remote_node_context *rnc,
u16 remote_node_index);
bool sci_remote_node_context_is_ready(
struct sci_remote_node_context *sci_rnc);
bool sci_remote_node_context_is_suspended(struct sci_remote_node_context *sci_rnc);
enum sci_status sci_remote_node_context_event_handler(struct sci_remote_node_context *sci_rnc,
u32 event_code);
enum sci_status sci_remote_node_context_destruct(struct sci_remote_node_context *sci_rnc,
scics_sds_remote_node_context_callback callback,
void *callback_parameter);
enum sci_status sci_remote_node_context_suspend(struct sci_remote_node_context *sci_rnc,
enum sci_remote_node_suspension_reasons reason,
u32 suspension_code);
enum sci_status sci_remote_node_context_resume(struct sci_remote_node_context *sci_rnc,
scics_sds_remote_node_context_callback cb_fn,
void *cb_p);
enum sci_status sci_remote_node_context_start_task(struct sci_remote_node_context *sci_rnc,
struct isci_request *ireq,
scics_sds_remote_node_context_callback cb_fn,
void *cb_p);
enum sci_status sci_remote_node_context_start_io(struct sci_remote_node_context *sci_rnc,
struct isci_request *ireq);
int sci_remote_node_context_is_safe_to_abort(
struct sci_remote_node_context *sci_rnc);
static inline bool sci_remote_node_context_is_being_destroyed(
struct sci_remote_node_context *sci_rnc)
{
return (sci_rnc->destination_state == RNC_DEST_FINAL)
|| ((sci_rnc->sm.current_state_id == SCI_RNC_INITIAL)
&& (sci_rnc->destination_state == RNC_DEST_UNSPECIFIED));
}
#endif /* _SCIC_SDS_REMOTE_NODE_CONTEXT_H_ */
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