drivers/scsi/isci/remote_node_context.h

   1 /*
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   3  * redistributing this file, you may do so under either license.
   4  *
   5  * GPL LICENSE SUMMARY
   6  *
   7  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
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  20  * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called LICENSE.GPL.
  23  *
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  26  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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  55
  56 #ifndef _SCIC_SDS_REMOTE_NODE_CONTEXT_H_
  57 #define _SCIC_SDS_REMOTE_NODE_CONTEXT_H_
  58
  59 /**
  60  * This file contains the structures, constants, and prototypes associated with
  61  *    the remote node context in the silicon.  It exists to model and manage
  62  *    the remote node context in the silicon.
  63  *
  64  *
  65  */
  66
  67 #include "state_machine.h"
  68
  69 /**
  70  *
  71  *
  72  * This constant represents an invalid remote device id, it is used to program
  73  * the STPDARNI register so the driver knows when it has received a SIGNATURE
  74  * FIS from the SCU.
  75  */
  76 #define SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX    0x0FFF
  77
  78 #define SCU_HARDWARE_SUSPENSION  (0)
  79 #define SCI_SOFTWARE_SUSPENSION  (1)
  80
  81 struct scic_sds_request;
  82 struct scic_sds_remote_device;
  83 struct scic_sds_remote_node_context;
  84
  85 typedef void (*scics_sds_remote_node_context_callback)(void *);
  86
  87 typedef enum sci_status (*scic_sds_remote_node_context_operation)(
  88         struct scic_sds_remote_node_context *sci_rnc,
  89         scics_sds_remote_node_context_callback callback,
  90         void *callback_parameter
  91         );
  92
  93 typedef enum sci_status (*scic_sds_remote_node_context_io_request)(
  94         struct scic_sds_remote_node_context *sci_rnc,
  95         struct scic_sds_request *sci_req
  96         );
  97
  98 struct scic_sds_remote_node_context_handlers {
  99         /**
 100          * This handler is invoked when there is a request to start an io request
 101          * operation.
 102          */
 103         scic_sds_remote_node_context_io_request start_io_handler;
 104
 105         /**
 106          * This handler is invoked when there is a request to start a task request
 107          * operation.
 108          */
 109         scic_sds_remote_node_context_io_request start_task_handler;
 110 };
 111
 112 /**
 113  * This is the enumeration of the remote node context states.
 114  */
 115 enum scis_sds_remote_node_context_states {
 116         /**
 117          * This state is the initial state for a remote node context.  On a resume
 118          * request the remote node context will transition to the posting state.
 119          */
 120         SCIC_SDS_REMOTE_NODE_CONTEXT_INITIAL_STATE,
 121
 122         /**
 123          * This is a transition state that posts the RNi to the hardware. Once the RNC
 124          * is posted the remote node context will be made ready.
 125          */
 126         SCIC_SDS_REMOTE_NODE_CONTEXT_POSTING_STATE,
 127
 128         /**
 129          * This is a transition state that will post an RNC invalidate to the
 130          * hardware.  Once the invalidate is complete the remote node context will
 131          * transition to the posting state.
 132          */
 133         SCIC_SDS_REMOTE_NODE_CONTEXT_INVALIDATING_STATE,
 134
 135         /**
 136          * This is a transition state that will post an RNC resume to the hardare.
 137          * Once the event notification of resume complete is received the remote node
 138          * context will transition to the ready state.
 139          */
 140         SCIC_SDS_REMOTE_NODE_CONTEXT_RESUMING_STATE,
 141
 142         /**
 143          * This is the state that the remote node context must be in to accept io
 144          * request operations.
 145          */
 146         SCIC_SDS_REMOTE_NODE_CONTEXT_READY_STATE,
 147
 148         /**
 149          * This is the state that the remote node context transitions to when it gets
 150          * a TX suspend notification from the hardware.
 151          */
 152         SCIC_SDS_REMOTE_NODE_CONTEXT_TX_SUSPENDED_STATE,
 153
 154         /**
 155          * This is the state that the remote node context transitions to when it gets
 156          * a TX RX suspend notification from the hardware.
 157          */
 158         SCIC_SDS_REMOTE_NODE_CONTEXT_TX_RX_SUSPENDED_STATE,
 159
 160         /**
 161          * This state is a wait state for the remote node context that waits for a
 162          * suspend notification from the hardware.  This state is entered when either
 163          * there is a request to supend the remote node context or when there is a TC
 164          * completion where the remote node will be suspended by the hardware.
 165          */
 166         SCIC_SDS_REMOTE_NODE_CONTEXT_AWAIT_SUSPENSION_STATE
 167 };
 168
 169 /**
 170  *
 171  *
 172  * This enumeration is used to define the end destination state for the remote
 173  * node context.
 174  */
 175 enum scic_sds_remote_node_context_destination_state {
 176         SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_UNSPECIFIED,
 177         SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_READY,
 178         SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_FINAL
 179 };
 180
 181 /**
 182  * struct scic_sds_remote_node_context - This structure contains the data
 183  *    associated with the remote node context object.  The remote node context
 184  *    (RNC) object models the the remote device information necessary to manage
 185  *    the silicon RNC.
 186  */
 187 struct scic_sds_remote_node_context {
 188         /**
 189          * This field indicates the remote node index (RNI) associated with
 190          * this RNC.
 191          */
 192         u16 remote_node_index;
 193
 194         /**
 195          * This field is the recored suspension code or the reason for the remote node
 196          * context suspension.
 197          */
 198         u32 suspension_code;
 199
 200         /**
 201          * This field is true if the remote node context is resuming from its current
 202          * state.  This can cause an automatic resume on receiving a suspension
 203          * notification.
 204          */
 205         enum scic_sds_remote_node_context_destination_state destination_state;
 206
 207         /**
 208          * This field contains the callback function that the user requested to be
 209          * called when the requested state transition is complete.
 210          */
 211         scics_sds_remote_node_context_callback user_callback;
 212
 213         /**
 214          * This field contains the parameter that is called when the user requested
 215          * state transition is completed.
 216          */
 217         void *user_cookie;
 218
 219         /**
 220          * This field contains the data for the object's state machine.
 221          */
 222         struct sci_base_state_machine state_machine;
 223
 224         struct scic_sds_remote_node_context_handlers *state_handlers;
 225 };
 226
 227 void scic_sds_remote_node_context_construct(struct scic_sds_remote_node_context *rnc,
 228                                             u16 remote_node_index);
 229
 230
 231 bool scic_sds_remote_node_context_is_ready(
 232         struct scic_sds_remote_node_context *sci_rnc);
 233
 234 #define scic_sds_remote_node_context_get_remote_node_index(rcn) \
 235         ((rnc)->remote_node_index)
 236
 237 enum sci_status scic_sds_remote_node_context_event_handler(struct scic_sds_remote_node_context *sci_rnc,
 238                                                            u32 event_code);
 239
 240 enum sci_status scic_sds_remote_node_context_destruct(struct scic_sds_remote_node_context *sci_rnc,
 241                                                       scics_sds_remote_node_context_callback callback,
 242                                                       void *callback_parameter);
 243
 244 enum sci_status scic_sds_remote_node_context_suspend(struct scic_sds_remote_node_context *sci_rnc,
 245                                                      u32 suspend_type,
 246                                                      scics_sds_remote_node_context_callback cb_fn,
 247                                                      void *cb_p);
 248
 249 enum sci_status scic_sds_remote_node_context_resume(struct scic_sds_remote_node_context *sci_rnc,
 250                                                     scics_sds_remote_node_context_callback cb_fn,
 251                                                     void *cb_p);
 252
 253 #define scic_sds_remote_node_context_start_io(rnc, request) \
 254         ((rnc)->state_handlers->start_io_handler(rnc, request))
 255
 256 #define scic_sds_remote_node_context_start_task(rnc, task) \
 257         ((rnc)->state_handlers->start_task_handler(rnc, task))
 258
 259 #endif  /* _SCIC_SDS_REMOTE_NODE_CONTEXT_H_ */