isci: merge ssp task management substates into primary state machine

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / isci / smp_request.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.
 *
 * 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.
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 * 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.
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 * modification, are permitted provided that the following conditions
 * are met:
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 * 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
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#include <scsi/sas.h>
#include "state_machine.h"
#include "remote_device.h"
#include "request.h"
#include "scu_completion_codes.h"
#include "scu_task_context.h"
#include "host.h"

static void scu_smp_request_construct_task_context(
        struct scic_sds_request *sci_req,
        struct smp_req *smp_req);

void scic_sds_smp_request_assign_buffers(struct scic_sds_request *sci_req)
{
        if (sci_req->was_tag_assigned_by_user == false)
                sci_req->task_context_buffer = &sci_req->tc;
}

/*
 * This function will fill in the SCU Task Context for a SMP request. The
 *    following important settings are utilized: -# task_type ==
 *    SCU_TASK_TYPE_SMP.  This simply indicates that a normal request type
 *    (i.e. non-raw frame) is being utilized to perform task management. -#
 *    control_frame == 1.  This ensures that the proper endianess is set so
 *    that the bytes are transmitted in the right order for a smp request frame.
 * @sci_req: This parameter specifies the smp request object being
 *    constructed.
 *
 */
static void
scu_smp_request_construct_task_context(struct scic_sds_request *sci_req,
                                       struct smp_req *smp_req)
{
        dma_addr_t dma_addr;
        struct scic_sds_controller *scic;
        struct scic_sds_remote_device *sci_dev;
        struct scic_sds_port *sci_port;
        struct scu_task_context *task_context;
        ssize_t word_cnt = sizeof(struct smp_req) / sizeof(u32);

        /* byte swap the smp request. */
        sci_swab32_cpy(&sci_req->smp.cmd, smp_req,
                       word_cnt);

        task_context = scic_sds_request_get_task_context(sci_req);

        scic = scic_sds_request_get_controller(sci_req);
        sci_dev = scic_sds_request_get_device(sci_req);
        sci_port = scic_sds_request_get_port(sci_req);

        /*
         * Fill in the TC with the its required data
         * 00h
         */
        task_context->priority = 0;
        task_context->initiator_request = 1;
        task_context->connection_rate = sci_dev->connection_rate;
        task_context->protocol_engine_index =
                scic_sds_controller_get_protocol_engine_group(scic);
        task_context->logical_port_index = scic_sds_port_get_index(sci_port);
        task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_SMP;
        task_context->abort = 0;
        task_context->valid = SCU_TASK_CONTEXT_VALID;
        task_context->context_type = SCU_TASK_CONTEXT_TYPE;

        /* 04h */
        task_context->remote_node_index = sci_dev->rnc.remote_node_index;
        task_context->command_code = 0;
        task_context->task_type = SCU_TASK_TYPE_SMP_REQUEST;

        /* 08h */
        task_context->link_layer_control = 0;
        task_context->do_not_dma_ssp_good_response = 1;
        task_context->strict_ordering = 0;
        task_context->control_frame = 1;
        task_context->timeout_enable = 0;
        task_context->block_guard_enable = 0;

        /* 0ch */
        task_context->address_modifier = 0;

        /* 10h */
        task_context->ssp_command_iu_length = smp_req->req_len;

        /* 14h */
        task_context->transfer_length_bytes = 0;

        /*
         * 18h ~ 30h, protocol specific
         * since commandIU has been build by framework at this point, we just
         * copy the frist DWord from command IU to this location. */
        memcpy(&task_context->type.smp, &sci_req->smp.cmd, sizeof(u32));

        /*
         * 40h
         * "For SMP you could program it to zero. We would prefer that way
         * so that done code will be consistent." - Venki
         */
        task_context->task_phase = 0;

        if (sci_req->was_tag_assigned_by_user) {
                /*
                 * Build the task context now since we have already read
                 * the data
                 */
                sci_req->post_context =
                        (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
                         (scic_sds_controller_get_protocol_engine_group(scic) <<
                          SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
                         (scic_sds_port_get_index(sci_port) <<
                          SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
                         scic_sds_io_tag_get_index(sci_req->io_tag));
        } else {
                /*
                 * Build the task context now since we have already read
                 * the data.
                 * I/O tag index is not assigned because we have to wait
                 * until we get a TCi.
                 */
                sci_req->post_context =
                        (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
                         (scic_sds_controller_get_protocol_engine_group(scic) <<
                          SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
                         (scic_sds_port_get_index(sci_port) <<
                          SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT));
        }

        /*
         * Copy the physical address for the command buffer to the SCU Task
         * Context command buffer should not contain command header.
         */
        dma_addr = scic_io_request_get_dma_addr(sci_req,
                                                ((char *) &sci_req->smp.cmd) +
                                                sizeof(u32));

        task_context->command_iu_upper = upper_32_bits(dma_addr);
        task_context->command_iu_lower = lower_32_bits(dma_addr);

        /* SMP response comes as UF, so no need to set response IU address. */
        task_context->response_iu_upper = 0;
        task_context->response_iu_lower = 0;
}

/*
 * This function processes an unsolicited frame while the SMP request is waiting
 *    for a response frame.  It will copy the response data, release the
 *    unsolicited frame, and transition the request to the
 *    SCI_BASE_REQUEST_STATE_COMPLETED state.
 * @sci_req: This parameter specifies the request for which the
 *    unsolicited frame was received.
 * @frame_index: This parameter indicates the unsolicited frame index that
 *    should contain the response.
 *
 * This function returns an indication of whether the response frame was handled
 * successfully or not. SCI_SUCCESS Currently this value is always returned and
 * indicates successful processing of the TC response.
 */
static enum sci_status
scic_sds_smp_request_await_response_frame_handler(struct scic_sds_request *sci_req,
                                                  u32 frame_index)
{
        enum sci_status status;
        void *frame_header;
        struct smp_resp *rsp_hdr = &sci_req->smp.rsp;
        ssize_t word_cnt = SMP_RESP_HDR_SZ / sizeof(u32);

        status = scic_sds_unsolicited_frame_control_get_header(
                &(scic_sds_request_get_controller(sci_req)->uf_control),
                frame_index,
                &frame_header);

        /* byte swap the header. */
        sci_swab32_cpy(rsp_hdr, frame_header, word_cnt);

        if (rsp_hdr->frame_type == SMP_RESPONSE) {
                void *smp_resp;

                status = scic_sds_unsolicited_frame_control_get_buffer(
                        &(scic_sds_request_get_controller(sci_req)->uf_control),
                        frame_index,
                        &smp_resp);

                word_cnt = (sizeof(struct smp_req) - SMP_RESP_HDR_SZ) /
                        sizeof(u32);

                sci_swab32_cpy(((u8 *) rsp_hdr) + SMP_RESP_HDR_SZ,
                               smp_resp, word_cnt);

                scic_sds_request_set_status(
                        sci_req, SCU_TASK_DONE_GOOD, SCI_SUCCESS);

                sci_base_state_machine_change_state(
                        &sci_req->started_substate_machine,
                        SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_COMPLETION);
        } else {
                /* This was not a response frame why did it get forwarded? */
                dev_err(scic_to_dev(sci_req->owning_controller),
                        "%s: SCIC SMP Request 0x%p received unexpected frame "
                        "%d type 0x%02x\n",
                        __func__,
                        sci_req,
                        frame_index,
                        rsp_hdr->frame_type);

                scic_sds_request_set_status(
                        sci_req,
                        SCU_TASK_DONE_SMP_FRM_TYPE_ERR,
                        SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR);

                sci_base_state_machine_change_state(
                        &sci_req->state_machine,
                        SCI_BASE_REQUEST_STATE_COMPLETED);
        }

        scic_sds_controller_release_frame(sci_req->owning_controller,
                                          frame_index);

        return SCI_SUCCESS;
}


/**
 * This method processes an abnormal TC completion while the SMP request is
 *    waiting for a response frame.  It decides what happened to the IO based
 *    on TC completion status.
 * @sci_req: This parameter specifies the request for which the TC
 *    completion was received.
 * @completion_code: This parameter indicates the completion status information
 *    for the TC.
 *
 * Indicate if the tc completion handler was successful. SCI_SUCCESS currently
 * this method always returns success.
 */
static enum sci_status scic_sds_smp_request_await_response_tc_completion_handler(
        struct scic_sds_request *sci_req,
        u32 completion_code)
{
        switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
                /*
                 * In the AWAIT RESPONSE state, any TC completion is unexpected.
                 * but if the TC has success status, we complete the IO anyway. */
                scic_sds_request_set_status(
                        sci_req, SCU_TASK_DONE_GOOD, SCI_SUCCESS
                        );

                sci_base_state_machine_change_state(
                        &sci_req->state_machine,
                        SCI_BASE_REQUEST_STATE_COMPLETED);
                break;

        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_RESP_TO_ERR):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_UFI_ERR):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_FRM_TYPE_ERR):
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_LL_RX_ERR):
                /*
                 * These status has been seen in a specific LSI expander, which sometimes
                 * is not able to send smp response within 2 ms. This causes our hardware
                 * break the connection and set TC completion with one of these SMP_XXX_XX_ERR
                 * status. For these type of error, we ask scic user to retry the request. */
                scic_sds_request_set_status(
                        sci_req, SCU_TASK_DONE_SMP_RESP_TO_ERR, SCI_FAILURE_RETRY_REQUIRED
                        );

                sci_base_state_machine_change_state(
                        &sci_req->state_machine,
                        SCI_BASE_REQUEST_STATE_COMPLETED);
                break;

        default:
                /*
                 * All other completion status cause the IO to be complete.  If a NAK
                 * was received, then it is up to the user to retry the request. */
                scic_sds_request_set_status(
                        sci_req,
                        SCU_NORMALIZE_COMPLETION_STATUS(completion_code),
                        SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR
                        );

                sci_base_state_machine_change_state(
                        &sci_req->state_machine,
                        SCI_BASE_REQUEST_STATE_COMPLETED);
                break;
        }

        return SCI_SUCCESS;
}


/**
 * This method processes the completions transport layer (TL) status to
 *    determine if the SMP request was sent successfully. If the SMP request
 *    was sent successfully, then the state for the SMP request transits to
 *    waiting for a response frame.
 * @sci_req: This parameter specifies the request for which the TC
 *    completion was received.
 * @completion_code: This parameter indicates the completion status information
 *    for the TC.
 *
 * Indicate if the tc completion handler was successful. SCI_SUCCESS currently
 * this method always returns success.
 */
static enum sci_status scic_sds_smp_request_await_tc_completion_tc_completion_handler(
        struct scic_sds_request *sci_req,
        u32 completion_code)
{
        switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
        case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
                scic_sds_request_set_status(
                        sci_req, SCU_TASK_DONE_GOOD, SCI_SUCCESS
                        );

                sci_base_state_machine_change_state(
                        &sci_req->state_machine,
                        SCI_BASE_REQUEST_STATE_COMPLETED);
                break;

        default:
                /*
                 * All other completion status cause the IO to be complete.  If a NAK
                 * was received, then it is up to the user to retry the request. */
                scic_sds_request_set_status(
                        sci_req,
                        SCU_NORMALIZE_COMPLETION_STATUS(completion_code),
                        SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR
                        );

                sci_base_state_machine_change_state(
                        &sci_req->state_machine,
                        SCI_BASE_REQUEST_STATE_COMPLETED);
                break;
        }

        return SCI_SUCCESS;
}


static const struct scic_sds_io_request_state_handler scic_sds_smp_request_started_substate_handler_table[] = {
        [SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_RESPONSE] = {
                .abort_handler          = scic_sds_request_started_state_abort_handler,
                .tc_completion_handler  = scic_sds_smp_request_await_response_tc_completion_handler,
                .frame_handler          = scic_sds_smp_request_await_response_frame_handler,
        },
        [SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_COMPLETION] = {
                .abort_handler          = scic_sds_request_started_state_abort_handler,
                .tc_completion_handler  =  scic_sds_smp_request_await_tc_completion_tc_completion_handler,
        }
};

/**
 * This method performs the actions required when entering the
 *    SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_RESPONSE sub-state. This
 *    includes setting the IO request state handlers for this sub-state.
 * @object: This parameter specifies the request object for which the sub-state
 *    change is occurring.
 *
 * none.
 */
static void scic_sds_smp_request_started_await_response_substate_enter(
        void *object)
{
        struct scic_sds_request *sci_req = object;

        SET_STATE_HANDLER(
                sci_req,
                scic_sds_smp_request_started_substate_handler_table,
                SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_RESPONSE
                );
}

/**
 * This method performs the actions required when entering the
 *    SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_COMPLETION sub-state.
 *    This includes setting the SMP request state handlers for this sub-state.
 * @object: This parameter specifies the request object for which the sub-state
 *    change is occurring.
 *
 * none.
 */
static void scic_sds_smp_request_started_await_tc_completion_substate_enter(
        void *object)
{
        struct scic_sds_request *sci_req = object;

        SET_STATE_HANDLER(
                sci_req,
                scic_sds_smp_request_started_substate_handler_table,
                SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_COMPLETION
                );
}

static const struct sci_base_state scic_sds_smp_request_started_substate_table[] = {
        [SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_RESPONSE] = {
                .enter_state = scic_sds_smp_request_started_await_response_substate_enter,
        },
        [SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_COMPLETION] = {
                .enter_state = scic_sds_smp_request_started_await_tc_completion_substate_enter,
        },
};

/**
 * This method is called by the SCI user to build an SMP IO request.
 *
 * - The user must have previously called scic_io_request_construct() on the
 * supplied IO request. Indicate if the controller successfully built the IO
 * request. SCI_SUCCESS This value is returned if the IO request was
 * successfully built. SCI_FAILURE_UNSUPPORTED_PROTOCOL This value is returned
 * if the remote_device does not support the SMP protocol.
 * SCI_FAILURE_INVALID_ASSOCIATION This value is returned if the user did not
 * properly set the association between the SCIC IO request and the user's IO
 * request.
 */
enum sci_status scic_io_request_construct_smp(struct scic_sds_request *sci_req)
{
        struct smp_req *smp_req = kmalloc(sizeof(*smp_req), GFP_KERNEL);

        if (!smp_req)
                return SCI_FAILURE_INSUFFICIENT_RESOURCES;

        sci_req->protocol                     = SCIC_SMP_PROTOCOL;
        sci_req->has_started_substate_machine = true;

        /* Construct the started sub-state machine. */
        sci_base_state_machine_construct(
                &sci_req->started_substate_machine,
                sci_req,
                scic_sds_smp_request_started_substate_table,
                SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_RESPONSE
                );

        /* Construct the SMP SCU Task Context */
        memcpy(smp_req, &sci_req->smp.cmd, sizeof(*smp_req));

        /*
         * Look at the SMP requests' header fields; for certain SAS 1.x SMP
         * functions under SAS 2.0, a zero request length really indicates
         * a non-zero default length. */
        if (smp_req->req_len == 0) {
                switch (smp_req->func) {
                case SMP_DISCOVER:
                case SMP_REPORT_PHY_ERR_LOG:
                case SMP_REPORT_PHY_SATA:
                case SMP_REPORT_ROUTE_INFO:
                        smp_req->req_len = 2;
                        break;
                case SMP_CONF_ROUTE_INFO:
                case SMP_PHY_CONTROL:
                case SMP_PHY_TEST_FUNCTION:
                        smp_req->req_len = 9;
                        break;
                        /* Default - zero is a valid default for 2.0. */
                }
        }

        scu_smp_request_construct_task_context(sci_req, smp_req);

        sci_base_state_machine_change_state(&sci_req->state_machine,
                SCI_BASE_REQUEST_STATE_CONSTRUCTED);

        kfree(smp_req);

        return SCI_SUCCESS;
}