linux/drivers/scsi/isci/remote_node_context.h
Dan Williams 88f3b62ac1 isci: move remote_device handling out of the core
Now that the core/lldd remote_device data structures are nominally unified
merge the corresponding sources into the top-level directory.  Also move the
remote_node_context infrastructure which has no analog at the lldd level.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:00:38 -07:00

302 lines
10 KiB
C

/*
* 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.
*
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* it under the terms of version 2 of the GNU General Public License as
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* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
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* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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#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 "sci_base_state.h"
#include "sci_base_state_machine.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
#define SCU_HARDWARE_SUSPENSION (0)
#define SCI_SOFTWARE_SUSPENSION (1)
struct scic_sds_request;
struct scic_sds_remote_device;
struct scic_sds_remote_node_context;
typedef void (*scics_sds_remote_node_context_callback)(void *);
typedef enum sci_status (*scic_sds_remote_node_context_operation)(
struct scic_sds_remote_node_context *sci_rnc,
scics_sds_remote_node_context_callback callback,
void *callback_parameter
);
typedef enum sci_status (*scic_sds_remote_node_context_suspend_operation)(
struct scic_sds_remote_node_context *sci_rnc,
u32 suspension_type,
scics_sds_remote_node_context_callback callback,
void *callback_parameter
);
typedef enum sci_status (*scic_sds_remote_node_context_io_request)(
struct scic_sds_remote_node_context *sci_rnc,
struct scic_sds_request *sci_req
);
typedef enum sci_status (*scic_sds_remote_node_context_event_handler)(
struct scic_sds_remote_node_context *sci_rnc,
u32 event_code
);
struct scic_sds_remote_node_context_handlers {
/**
* This handle is invoked to stop the RNC. The callback is invoked when after
* the hardware notification that the RNC has been invalidated.
*/
scic_sds_remote_node_context_operation destruct_handler;
/**
* This handler is invoked when there is a request to suspend the RNC. The
* callback is invoked after the hardware notification that the remote node is
* suspended.
*/
scic_sds_remote_node_context_suspend_operation suspend_handler;
/**
* This handler is invoked when there is a request to resume the RNC. The
* callback is invoked when after the RNC has reached the ready state.
*/
scic_sds_remote_node_context_operation resume_handler;
/**
* This handler is invoked when there is a request to start an io request
* operation.
*/
scic_sds_remote_node_context_io_request start_io_handler;
/**
* This handler is invoked when there is a request to start a task request
* operation.
*/
scic_sds_remote_node_context_io_request start_task_handler;
/**
* This handler is invoked where there is an RNC event that must be processed.
*/
scic_sds_remote_node_context_event_handler event_handler;
};
/**
* This is the enumeration of the remote node context states.
*/
enum scis_sds_remote_node_context_states {
/**
* This state is the initial state for a remote node context. On a resume
* request the remote node context will transition to the posting state.
*/
SCIC_SDS_REMOTE_NODE_CONTEXT_INITIAL_STATE,
/**
* This is a transition state that posts the RNi to the hardware. Once the RNC
* is posted the remote node context will be made ready.
*/
SCIC_SDS_REMOTE_NODE_CONTEXT_POSTING_STATE,
/**
* This is a 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.
*/
SCIC_SDS_REMOTE_NODE_CONTEXT_INVALIDATING_STATE,
/**
* This is a 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.
*/
SCIC_SDS_REMOTE_NODE_CONTEXT_RESUMING_STATE,
/**
* This is the state that the remote node context must be in to accept io
* request operations.
*/
SCIC_SDS_REMOTE_NODE_CONTEXT_READY_STATE,
/**
* This is the state that the remote node context transitions to when it gets
* a TX suspend notification from the hardware.
*/
SCIC_SDS_REMOTE_NODE_CONTEXT_TX_SUSPENDED_STATE,
/**
* This is the state that the remote node context transitions to when it gets
* a TX RX suspend notification from the hardware.
*/
SCIC_SDS_REMOTE_NODE_CONTEXT_TX_RX_SUSPENDED_STATE,
/**
* This state is a 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.
*/
SCIC_SDS_REMOTE_NODE_CONTEXT_AWAIT_SUSPENSION_STATE,
SCIC_SDS_REMOTE_NODE_CONTEXT_MAX_STATES
};
/**
*
*
* This enumeration is used to define the end destination state for the remote
* node context.
*/
enum scic_sds_remote_node_context_destination_state {
SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_UNSPECIFIED,
SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_READY,
SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_FINAL
};
/**
* struct scic_sds_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 scic_sds_remote_node_context {
/*
* parent object
*/
struct sci_base_object parent;
/**
* This field indicates the remote node index (RNI) associated with
* this RNC.
*/
u16 remote_node_index;
/**
* This field is the recored suspension code or the reason for the remote node
* context suspension.
*/
u32 suspension_code;
/**
* 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 scic_sds_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 state_machine;
struct scic_sds_remote_node_context_handlers *state_handlers;
};
void scic_sds_remote_node_context_construct(struct scic_sds_remote_node_context *rnc,
u16 remote_node_index);
bool scic_sds_remote_node_context_is_ready(
struct scic_sds_remote_node_context *sci_rnc);
#define scic_sds_remote_node_context_get_remote_node_index(rcn) \
((rnc)->remote_node_index)
#define scic_sds_remote_node_context_event_handler(rnc, event_code) \
((rnc)->state_handlers->event_handler(rnc, event_code))
#define scic_sds_remote_node_context_resume(rnc, callback, parameter) \
((rnc)->state_handlers->resume_handler(rnc, callback, parameter))
#define scic_sds_remote_node_context_suspend(rnc, suspend_type, callback, parameter) \
((rnc)->state_handlers->suspend_handler(rnc, suspend_type, callback, parameter))
#define scic_sds_remote_node_context_destruct(rnc, callback, parameter) \
((rnc)->state_handlers->destruct_handler(rnc, callback, parameter))
#define scic_sds_remote_node_context_start_io(rnc, request) \
((rnc)->state_handlers->start_io_handler(rnc, request))
#define scic_sds_remote_node_context_start_task(rnc, task) \
((rnc)->state_handlers->start_task_handler(rnc, task))
#endif /* _SCIC_SDS_REMOTE_NODE_CONTEXT_H_ */