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Diffstat (limited to 'drivers/scsi/isci/remote_node_context.h')
| -rw-r--r-- | drivers/scsi/isci/remote_node_context.h | 301 |
1 files changed, 301 insertions, 0 deletions
diff --git a/drivers/scsi/isci/remote_node_context.h b/drivers/scsi/isci/remote_node_context.h new file mode 100644 index 000000000000..b3f2546090dd --- /dev/null +++ b/drivers/scsi/isci/remote_node_context.h @@ -0,0 +1,301 @@ +/* + * 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. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * 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 + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#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_ */ |
