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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  10  * it under the terms of version 2 of the GNU General Public License as
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  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
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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.
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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 "isci.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 isci_request;
  82 struct isci_remote_device;
  83 struct sci_remote_node_context;
  84
  85 typedef void (*scics_sds_remote_node_context_callback)(void *);
  86
  87 /**
  88  * This is the enumeration of the remote node context states.
  89  */
  90 enum scis_sds_remote_node_context_states {
  91         /**
  92          * This state is the initial state for a remote node context.  On a resume
  93          * request the remote node context will transition to the posting state.
  94          */
  95         SCI_RNC_INITIAL,
  96
  97         /**
  98          * This is a transition state that posts the RNi to the hardware. Once the RNC
  99          * is posted the remote node context will be made ready.
 100          */
 101         SCI_RNC_POSTING,
 102
 103         /**
 104          * This is a transition state that will post an RNC invalidate to the
 105          * hardware.  Once the invalidate is complete the remote node context will
 106          * transition to the posting state.
 107          */
 108         SCI_RNC_INVALIDATING,
 109
 110         /**
 111          * This is a transition state that will post an RNC resume to the hardare.
 112          * Once the event notification of resume complete is received the remote node
 113          * context will transition to the ready state.
 114          */
 115         SCI_RNC_RESUMING,
 116
 117         /**
 118          * This is the state that the remote node context must be in to accept io
 119          * request operations.
 120          */
 121         SCI_RNC_READY,
 122
 123         /**
 124          * This is the state that the remote node context transitions to when it gets
 125          * a TX suspend notification from the hardware.
 126          */
 127         SCI_RNC_TX_SUSPENDED,
 128
 129         /**
 130          * This is the state that the remote node context transitions to when it gets
 131          * a TX RX suspend notification from the hardware.
 132          */
 133         SCI_RNC_TX_RX_SUSPENDED,
 134
 135         /**
 136          * This state is a wait state for the remote node context that waits for a
 137          * suspend notification from the hardware.  This state is entered when either
 138          * there is a request to supend the remote node context or when there is a TC
 139          * completion where the remote node will be suspended by the hardware.
 140          */
 141         SCI_RNC_AWAIT_SUSPENSION
 142 };
 143
 144 /**
 145  *
 146  *
 147  * This enumeration is used to define the end destination state for the remote
 148  * node context.
 149  */
 150 enum sci_remote_node_context_destination_state {
 151         SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_UNSPECIFIED,
 152         SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_READY,
 153         SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_FINAL
 154 };
 155
 156 /**
 157  * struct sci_remote_node_context - This structure contains the data
 158  *    associated with the remote node context object.  The remote node context
 159  *    (RNC) object models the the remote device information necessary to manage
 160  *    the silicon RNC.
 161  */
 162 struct sci_remote_node_context {
 163         /**
 164          * This field indicates the remote node index (RNI) associated with
 165          * this RNC.
 166          */
 167         u16 remote_node_index;
 168
 169         /**
 170          * This field is the recored suspension code or the reason for the remote node
 171          * context suspension.
 172          */
 173         u32 suspension_code;
 174
 175         /**
 176          * This field is true if the remote node context is resuming from its current
 177          * state.  This can cause an automatic resume on receiving a suspension
 178          * notification.
 179          */
 180         enum sci_remote_node_context_destination_state destination_state;
 181
 182         /**
 183          * This field contains the callback function that the user requested to be
 184          * called when the requested state transition is complete.
 185          */
 186         scics_sds_remote_node_context_callback user_callback;
 187
 188         /**
 189          * This field contains the parameter that is called when the user requested
 190          * state transition is completed.
 191          */
 192         void *user_cookie;
 193
 194         /**
 195          * This field contains the data for the object's state machine.
 196          */
 197         struct sci_base_state_machine sm;
 198 };
 199
 200 void sci_remote_node_context_construct(struct sci_remote_node_context *rnc,
 201                                             u16 remote_node_index);
 202
 203
 204 bool sci_remote_node_context_is_ready(
 205         struct sci_remote_node_context *sci_rnc);
 206
 207 enum sci_status sci_remote_node_context_event_handler(struct sci_remote_node_context *sci_rnc,
 208                                                            u32 event_code);
 209 enum sci_status sci_remote_node_context_destruct(struct sci_remote_node_context *sci_rnc,
 210                                                       scics_sds_remote_node_context_callback callback,
 211                                                       void *callback_parameter);
 212 enum sci_status sci_remote_node_context_suspend(struct sci_remote_node_context *sci_rnc,
 213                                                      u32 suspend_type,
 214                                                      scics_sds_remote_node_context_callback cb_fn,
 215                                                      void *cb_p);
 216 enum sci_status sci_remote_node_context_resume(struct sci_remote_node_context *sci_rnc,
 217                                                     scics_sds_remote_node_context_callback cb_fn,
 218                                                     void *cb_p);
 219 enum sci_status sci_remote_node_context_start_task(struct sci_remote_node_context *sci_rnc,
 220                                                         struct isci_request *ireq);
 221 enum sci_status sci_remote_node_context_start_io(struct sci_remote_node_context *sci_rnc,
 222                                                       struct isci_request *ireq);
 223
 224 #endif  /* _SCIC_SDS_REMOTE_NODE_CONTEXT_H_ */