diff options
Diffstat (limited to 'drivers/scsi/isci/core/scic_sds_request.h')
| -rw-r--r-- | drivers/scsi/isci/core/scic_sds_request.h | 484 |
1 files changed, 484 insertions, 0 deletions
diff --git a/drivers/scsi/isci/core/scic_sds_request.h b/drivers/scsi/isci/core/scic_sds_request.h new file mode 100644 index 000000000000..0691a7552a2a --- /dev/null +++ b/drivers/scsi/isci/core/scic_sds_request.h @@ -0,0 +1,484 @@ +/* + * 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_IO_REQUEST_H_ +#define _SCIC_SDS_IO_REQUEST_H_ + +/** + * This file contains the structures, constants and prototypes for the + * SCIC_SDS_IO_REQUEST object. + * + * + */ + +#include "scic_io_request.h" + +#include "sci_base_request.h" +#include "scu_task_context.h" +#include "intel_sas.h" + +struct scic_sds_controller; +struct scic_sds_remote_device; +struct scic_sds_io_request_state_handler; + +/** + * enum _SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATES - This enumeration + * depicts all of the substates for a task management request to be + * performed in the STARTED super-state. + * + * + */ +enum scic_sds_raw_request_started_task_mgmt_substates { + /** + * The AWAIT_TC_COMPLETION sub-state indicates that the started raw + * task management request is waiting for the transmission of the + * initial frame (i.e. command, task, etc.). + */ + SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_COMPLETION, + + /** + * This sub-state indicates that the started task management request + * is waiting for the reception of an unsolicited frame + * (i.e. response IU). + */ + SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_RESPONSE, +}; + + +/** + * enum _SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATES - This enumeration depicts all + * of the substates for a SMP request to be performed in the STARTED + * super-state. + * + * + */ +enum scic_sds_smp_request_started_substates { + /** + * This sub-state indicates that the started task management request + * is waiting for the reception of an unsolicited frame + * (i.e. response IU). + */ + SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_RESPONSE, + + /** + * The AWAIT_TC_COMPLETION sub-state indicates that the started SMP request is + * waiting for the transmission of the initial frame (i.e. command, task, etc.). + */ + SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_COMPLETION, +}; + +/** + * struct SCIC_SDS_IO_REQUEST - This structure contains or references all of + * the data necessary to process a task management or normal IO request. + * + * + */ +struct scic_sds_request { + /** + * This field indictes the parent object of the request. + */ + struct sci_base_request parent; + + void *user_request; + + /** + * This field simply points to the controller to which this IO request + * is associated. + */ + struct scic_sds_controller *owning_controller; + + /** + * This field simply points to the remote device to which this IO request + * is associated. + */ + struct scic_sds_remote_device *target_device; + + /** + * This field is utilized to determine if the SCI user is managing + * the IO tag for this request or if the core is managing it. + */ + bool was_tag_assigned_by_user; + + /** + * This field indicates the IO tag for this request. The IO tag is + * comprised of the task_index and a sequence count. The sequence count + * is utilized to help identify tasks from one life to another. + */ + u16 io_tag; + + /** + * This field specifies the protocol being utilized for this + * IO request. + */ + SCIC_TRANSPORT_PROTOCOL protocol; + + /** + * This field indicates the completion status taken from the SCUs + * completion code. It indicates the completion result for the SCU hardware. + */ + u32 scu_status; + + /** + * This field indicates the completion status returned to the SCI user. It + * indicates the users view of the io request completion. + */ + u32 sci_status; + + /** + * This field contains the value to be utilized when posting (e.g. Post_TC, + * Post_TC_Abort) this request to the silicon. + */ + u32 post_context; + + void *command_buffer; + void *response_buffer; + struct scu_task_context *task_context_buffer; + struct scu_sgl_element_pair *sgl_element_pair_buffer; + + /** + * This field indicates if this request is a task management request or + * normal IO request. + */ + bool is_task_management_request; + + /** + * This field indicates that this request contains an initialized started + * substate machine. + */ + bool has_started_substate_machine; + + /** + * This field is a pointer to the stored rx frame data. It is used in STP + * internal requests and SMP response frames. If this field is non-NULL the + * saved frame must be released on IO request completion. + * + * @todo In the future do we want to keep a list of RX frame buffers? + */ + u32 saved_rx_frame_index; + + /** + * This field specifies the data necessary to manage the sub-state + * machine executed while in the SCI_BASE_REQUEST_STATE_STARTED state. + */ + struct sci_base_state_machine started_substate_machine; + + /** + * This field specifies the current state handlers in place for this + * IO Request object. This field is updated each time the request + * changes state. + */ + const struct scic_sds_io_request_state_handler *state_handlers; + + /** + * This field in the recorded device sequence for the io request. This is + * recorded during the build operation and is compared in the start + * operation. If the sequence is different then there was a change of + * devices from the build to start operations. + */ + u8 device_sequence; + +}; + + +typedef enum sci_status +(*scic_sds_io_request_frame_handler_t)(struct scic_sds_request *req, u32 frame); + +typedef enum sci_status +(*scic_sds_io_request_event_handler_t)(struct scic_sds_request *req, u32 event); + +typedef enum sci_status +(*scic_sds_io_request_task_completion_handler_t)(struct scic_sds_request *req, u32 completion_code); + +/** + * struct scic_sds_io_request_state_handler - This is the SDS core definition + * of the state handlers. + * + * + */ +struct scic_sds_io_request_state_handler { + struct sci_base_request_state_handler parent; + + scic_sds_io_request_task_completion_handler_t tc_completion_handler; + scic_sds_io_request_event_handler_t event_handler; + scic_sds_io_request_frame_handler_t frame_handler; + +}; + +extern const struct sci_base_state scic_sds_request_state_table[]; +extern const struct scic_sds_io_request_state_handler scic_sds_request_state_handler_table[]; + +extern const struct sci_base_state scic_sds_io_request_started_task_mgmt_substate_table[]; +extern const struct scic_sds_io_request_state_handler scic_sds_ssp_task_request_started_substate_handler_table[]; + +extern const struct sci_base_state scic_sds_smp_request_started_substate_table[]; +extern const struct scic_sds_io_request_state_handler scic_sds_smp_request_started_substate_handler_table[]; + +/** + * + * + * This macro returns the maximum number of SGL element paris that we will + * support in a single IO request. + */ +#define SCU_MAX_SGL_ELEMENT_PAIRS ((SCU_IO_REQUEST_SGE_COUNT + 1) / 2) + +/** + * scic_sds_request_get_controller() - + * + * This macro will return the controller for this io request object + */ +#define scic_sds_request_get_controller(this_request) \ + ((this_request)->owning_controller) + +/** + * scic_sds_request_get_device() - + * + * This macro will return the device for this io request object + */ +#define scic_sds_request_get_device(this_request) \ + ((this_request)->target_device) + +/** + * scic_sds_request_get_port() - + * + * This macro will return the port for this io request object + */ +#define scic_sds_request_get_port(this_request) \ + scic_sds_remote_device_get_port(scic_sds_request_get_device(this_request)) + +/** + * scic_sds_request_get_post_context() - + * + * This macro returns the constructed post context result for the io request. + */ +#define scic_sds_request_get_post_context(this_request) \ + ((this_request)->post_context) + +/** + * scic_sds_request_get_task_context() - + * + * This is a helper macro to return the os handle for this request object. + */ +#define scic_sds_request_get_task_context(request) \ + ((request)->task_context_buffer) + +#define CACHE_LINE_SIZE (64) +#define scic_sds_request_align_task_context_buffer(address) \ + ((struct scu_task_context *)(\ + (((unsigned long)(address)) + (CACHE_LINE_SIZE - 1)) \ + & ~(CACHE_LINE_SIZE - 1) \ + )) + +/** + * scic_sds_request_align_sgl_element_buffer() - + * + * This macro will align the memory address so that it is correct for the SCU + * hardware to DMA the SGL element pairs. + */ +#define scic_sds_request_align_sgl_element_buffer(address) \ + ((struct scu_sgl_element_pair *)(\ + ((char *)(address)) \ + + (\ + ((~(unsigned long)(address)) + 1) \ + & (sizeof(struct scu_sgl_element_pair) - 1) \ + ) \ + )) + +/** + * scic_sds_request_set_status() - + * + * This macro will set the scu hardware status and sci request completion + * status for an io request. + */ +#define scic_sds_request_set_status(request, scu_status_code, sci_status_code) \ + { \ + (request)->scu_status = (scu_status_code); \ + (request)->sci_status = (sci_status_code); \ + } + +#define scic_sds_request_complete(a_request) \ + ((a_request)->state_handlers->parent.complete_handler(&(a_request)->parent)) + + + + +/** + * scic_sds_io_request_tc_completion() - + * + * This macro invokes the core state task completion handler for the + * SCIC_SDS_IO_REQUEST_T object. + */ +#define scic_sds_io_request_tc_completion(this_request, completion_code) \ + { \ + if (this_request->parent.state_machine.current_state_id \ + == SCI_BASE_REQUEST_STATE_STARTED \ + && this_request->has_started_substate_machine \ + == false) \ + scic_sds_request_started_state_tc_completion_handler(this_request, completion_code); \ + else \ + this_request->state_handlers->tc_completion_handler(this_request, completion_code); \ + } + +/** + * SCU_SGL_ZERO() - + * + * This macro zeros the hardware SGL element data + */ +#define SCU_SGL_ZERO(scu_sge) \ + { \ + (scu_sge).length = 0; \ + (scu_sge).address_lower = 0; \ + (scu_sge).address_upper = 0; \ + (scu_sge).address_modifier = 0; \ + } + +/** + * SCU_SGL_COPY() - + * + * This macro copys the SGL Element data from the host os to the hardware SGL + * elment data + */ +#define SCU_SGL_COPY(os_handle, scu_sge, os_sge) \ + { \ + (scu_sge).length = \ + scic_cb_sge_get_length_field(os_handle, os_sge); \ + (scu_sge).address_upper = \ + upper_32_bits(scic_cb_sge_get_address_field(os_handle, os_sge)); \ + (scu_sge).address_lower = \ + lower_32_bits(scic_cb_sge_get_address_field(os_handle, os_sge)); \ + (scu_sge).address_modifier = 0; \ + } + +/* + * ***************************************************************************** + * * CORE REQUEST PROTOTYPES + * ***************************************************************************** */ + +void scic_sds_request_build_sgl( + struct scic_sds_request *this_request); + + + +void scic_sds_stp_request_assign_buffers( + struct scic_sds_request *this_request); + +void scic_sds_smp_request_assign_buffers( + struct scic_sds_request *this_request); + +/* --------------------------------------------------------------------------- */ + +enum sci_status scic_sds_request_start( + struct scic_sds_request *this_request); + +enum sci_status scic_sds_io_request_terminate( + struct scic_sds_request *this_request); + +enum sci_status scic_sds_io_request_complete( + struct scic_sds_request *this_request); + +void scic_sds_io_request_copy_response( + struct scic_sds_request *this_request); + +enum sci_status scic_sds_io_request_event_handler( + struct scic_sds_request *this_request, + u32 event_code); + +enum sci_status scic_sds_io_request_frame_handler( + struct scic_sds_request *this_request, + u32 frame_index); + + +enum sci_status scic_sds_task_request_terminate( + struct scic_sds_request *this_request); + +/* + * ***************************************************************************** + * * DEFAULT STATE HANDLERS + * ***************************************************************************** */ + +enum sci_status scic_sds_request_default_start_handler( + struct sci_base_request *this_request); + + +enum sci_status scic_sds_request_default_complete_handler( + struct sci_base_request *this_request); + +enum sci_status scic_sds_request_default_destruct_handler( + struct sci_base_request *this_request); + +enum sci_status scic_sds_request_default_tc_completion_handler( + struct scic_sds_request *this_request, + u32 completion_code); + +enum sci_status scic_sds_request_default_event_handler( + struct scic_sds_request *this_request, + u32 event_code); + +enum sci_status scic_sds_request_default_frame_handler( + struct scic_sds_request *this_request, + u32 frame_index); + +/* + * ***************************************************************************** + * * STARTED STATE HANDLERS + * ***************************************************************************** */ + +enum sci_status scic_sds_request_started_state_abort_handler( + struct sci_base_request *this_request); + +enum sci_status scic_sds_request_started_state_tc_completion_handler( + struct scic_sds_request *this_request, + u32 completion_code); + +#endif /* _SCIC_SDS_IO_REQUEST_H_ */ |