237 lines
8.7 KiB
C
237 lines
8.7 KiB
C
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/*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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* The full GNU General Public License is included in this distribution
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* in the file called LICENSE.GPL.
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*
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* BSD LICENSE
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*
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* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _SCIC_SDS_REMOTE_NODE_CONTEXT_H_
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#define _SCIC_SDS_REMOTE_NODE_CONTEXT_H_
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/**
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* This file contains the structures, constants, and prototypes associated with
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* the remote node context in the silicon. It exists to model and manage
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* the remote node context in the silicon.
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*
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*
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*/
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#include "isci.h"
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/**
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*
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*
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* This constant represents an invalid remote device id, it is used to program
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* the STPDARNI register so the driver knows when it has received a SIGNATURE
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* FIS from the SCU.
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*/
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#define SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX 0x0FFF
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enum sci_remote_node_suspension_reasons {
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SCI_HW_SUSPEND,
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SCI_SW_SUSPEND_NORMAL,
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SCI_SW_SUSPEND_LINKHANG_DETECT
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};
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#define SCI_SOFTWARE_SUSPEND_CMD SCU_CONTEXT_COMMAND_POST_RNC_SUSPEND_TX_RX
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#define SCI_SOFTWARE_SUSPEND_EXPECTED_EVENT SCU_EVENT_TL_RNC_SUSPEND_TX_RX
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struct isci_request;
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struct isci_remote_device;
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struct sci_remote_node_context;
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typedef void (*scics_sds_remote_node_context_callback)(void *);
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/**
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* enum sci_remote_node_context_states
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* @SCI_RNC_INITIAL initial state for a remote node context. On a resume
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* request the remote node context will transition to the posting state.
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*
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* @SCI_RNC_POSTING: transition state that posts the RNi to the hardware. Once
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* the RNC is posted the remote node context will be made ready.
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*
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* @SCI_RNC_INVALIDATING: transition state that will post an RNC invalidate to
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* the hardware. Once the invalidate is complete the remote node context will
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* transition to the posting state.
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*
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* @SCI_RNC_RESUMING: transition state that will post an RNC resume to the
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* hardare. Once the event notification of resume complete is received the
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* remote node context will transition to the ready state.
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*
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* @SCI_RNC_READY: state that the remote node context must be in to accept io
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* request operations.
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*
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* @SCI_RNC_TX_SUSPENDED: state that the remote node context transitions to when
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* it gets a TX suspend notification from the hardware.
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*
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* @SCI_RNC_TX_RX_SUSPENDED: state that the remote node context transitions to
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* when it gets a TX RX suspend notification from the hardware.
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*
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* @SCI_RNC_AWAIT_SUSPENSION: wait state for the remote node context that waits
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* for a suspend notification from the hardware. This state is entered when
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* either there is a request to supend the remote node context or when there is
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* a TC completion where the remote node will be suspended by the hardware.
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*/
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#define RNC_STATES {\
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C(RNC_INITIAL),\
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C(RNC_POSTING),\
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C(RNC_INVALIDATING),\
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C(RNC_RESUMING),\
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C(RNC_READY),\
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C(RNC_TX_SUSPENDED),\
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C(RNC_TX_RX_SUSPENDED),\
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C(RNC_AWAIT_SUSPENSION),\
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}
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#undef C
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#define C(a) SCI_##a
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enum scis_sds_remote_node_context_states RNC_STATES;
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#undef C
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const char *rnc_state_name(enum scis_sds_remote_node_context_states state);
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/**
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*
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*
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* This enumeration is used to define the end destination state for the remote
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* node context.
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*/
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enum sci_remote_node_context_destination_state {
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RNC_DEST_UNSPECIFIED,
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RNC_DEST_READY,
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RNC_DEST_FINAL,
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RNC_DEST_SUSPENDED, /* Set when suspend during post/invalidate */
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RNC_DEST_SUSPENDED_RESUME /* Set when a resume was done during posting
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* or invalidating and already suspending.
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*/
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};
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/**
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* struct sci_remote_node_context - This structure contains the data
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* associated with the remote node context object. The remote node context
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* (RNC) object models the the remote device information necessary to manage
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* the silicon RNC.
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*/
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struct sci_remote_node_context {
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/**
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* This field indicates the remote node index (RNI) associated with
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* this RNC.
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*/
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u16 remote_node_index;
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/**
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* This field is the recored suspension type of the remote node
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* context suspension.
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*/
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u32 suspend_type;
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enum sci_remote_node_suspension_reasons suspend_reason;
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u32 suspend_count;
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/**
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* This field is true if the remote node context is resuming from its current
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* state. This can cause an automatic resume on receiving a suspension
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* notification.
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*/
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enum sci_remote_node_context_destination_state destination_state;
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/**
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* This field contains the callback function that the user requested to be
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* called when the requested state transition is complete.
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*/
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scics_sds_remote_node_context_callback user_callback;
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/**
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* This field contains the parameter that is called when the user requested
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* state transition is completed.
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*/
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void *user_cookie;
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/**
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* This field contains the data for the object's state machine.
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*/
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struct sci_base_state_machine sm;
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};
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void sci_remote_node_context_construct(struct sci_remote_node_context *rnc,
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u16 remote_node_index);
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bool sci_remote_node_context_is_ready(
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struct sci_remote_node_context *sci_rnc);
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bool sci_remote_node_context_is_suspended(struct sci_remote_node_context *sci_rnc);
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enum sci_status sci_remote_node_context_event_handler(struct sci_remote_node_context *sci_rnc,
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u32 event_code);
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enum sci_status sci_remote_node_context_destruct(struct sci_remote_node_context *sci_rnc,
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scics_sds_remote_node_context_callback callback,
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void *callback_parameter);
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enum sci_status sci_remote_node_context_suspend(struct sci_remote_node_context *sci_rnc,
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enum sci_remote_node_suspension_reasons reason,
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u32 suspension_code);
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enum sci_status sci_remote_node_context_resume(struct sci_remote_node_context *sci_rnc,
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scics_sds_remote_node_context_callback cb_fn,
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void *cb_p);
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enum sci_status sci_remote_node_context_start_task(struct sci_remote_node_context *sci_rnc,
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struct isci_request *ireq,
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scics_sds_remote_node_context_callback cb_fn,
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void *cb_p);
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enum sci_status sci_remote_node_context_start_io(struct sci_remote_node_context *sci_rnc,
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struct isci_request *ireq);
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int sci_remote_node_context_is_safe_to_abort(
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struct sci_remote_node_context *sci_rnc);
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static inline bool sci_remote_node_context_is_being_destroyed(
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struct sci_remote_node_context *sci_rnc)
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{
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return (sci_rnc->destination_state == RNC_DEST_FINAL)
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|| ((sci_rnc->sm.current_state_id == SCI_RNC_INITIAL)
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&& (sci_rnc->destination_state == RNC_DEST_UNSPECIFIED));
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}
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#endif /* _SCIC_SDS_REMOTE_NODE_CONTEXT_H_ */
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