remote_node_context.h

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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.
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 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
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 *     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
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 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 */

#ifndef _SCIC_SDS_REMOTE_NODE_CONTEXT_H_
#define _SCIC_SDS_REMOTE_NODE_CONTEXT_H_

#include "isci.h"

#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 *);

#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);

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 {
    u16 remote_node_index;

    u32 suspend_type;
    enum sci_remote_node_suspension_reasons suspend_reason;
    u32 suspend_count;

    enum sci_remote_node_context_destination_state destination_state;

    scics_sds_remote_node_context_callback user_callback;

    void *user_cookie;

    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_ */