367 lines
11 KiB
C
367 lines
11 KiB
C
/*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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* The full GNU General Public License is included in this distribution
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* in the file called LICENSE.GPL.
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*
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* BSD LICENSE
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*
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* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _ISCI_TASK_H_
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#define _ISCI_TASK_H_
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#include <scsi/sas_ata.h>
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#include "host.h"
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struct isci_request;
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/**
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* enum isci_tmf_cb_state - This enum defines the possible states in which the
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* TMF callback function is invoked during the TMF execution process.
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*
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*
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*/
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enum isci_tmf_cb_state {
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isci_tmf_init_state = 0,
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isci_tmf_started,
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isci_tmf_timed_out
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};
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/**
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* enum isci_tmf_function_codes - This enum defines the possible preparations
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* of task management requests.
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*
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*
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*/
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enum isci_tmf_function_codes {
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isci_tmf_func_none = 0,
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isci_tmf_ssp_task_abort = TMF_ABORT_TASK,
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isci_tmf_ssp_lun_reset = TMF_LU_RESET,
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isci_tmf_sata_srst_high = TMF_LU_RESET + 0x100, /* Non SCSI */
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isci_tmf_sata_srst_low = TMF_LU_RESET + 0x101 /* Non SCSI */
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};
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/**
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* struct isci_tmf - This class represents the task management object which
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* acts as an interface to libsas for processing task management requests
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*
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*
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*/
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struct isci_tmf {
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struct completion *complete;
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enum sas_protocol proto;
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union {
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struct ssp_response_iu resp_iu;
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struct dev_to_host_fis d2h_fis;
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u8 rsp_buf[SSP_RESP_IU_MAX_SIZE];
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} resp;
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unsigned char lun[8];
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u16 io_tag;
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struct isci_remote_device *device;
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enum isci_tmf_function_codes tmf_code;
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int status;
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/* The optional callback function allows the user process to
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* track the TMF transmit / timeout conditions.
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*/
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void (*cb_state_func)(
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enum isci_tmf_cb_state,
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struct isci_tmf *, void *);
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void *cb_data;
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};
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static inline void isci_print_tmf(struct isci_tmf *tmf)
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{
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if (SAS_PROTOCOL_SATA == tmf->proto)
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dev_dbg(&tmf->device->isci_port->isci_host->pdev->dev,
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"%s: status = %x\n"
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"tmf->resp.d2h_fis.status = %x\n"
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"tmf->resp.d2h_fis.error = %x\n",
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__func__,
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tmf->status,
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tmf->resp.d2h_fis.status,
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tmf->resp.d2h_fis.error);
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else
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dev_dbg(&tmf->device->isci_port->isci_host->pdev->dev,
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"%s: status = %x\n"
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"tmf->resp.resp_iu.data_present = %x\n"
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"tmf->resp.resp_iu.status = %x\n"
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"tmf->resp.resp_iu.data_length = %x\n"
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"tmf->resp.resp_iu.data[0] = %x\n"
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"tmf->resp.resp_iu.data[1] = %x\n"
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"tmf->resp.resp_iu.data[2] = %x\n"
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"tmf->resp.resp_iu.data[3] = %x\n",
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__func__,
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tmf->status,
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tmf->resp.resp_iu.datapres,
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tmf->resp.resp_iu.status,
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be32_to_cpu(tmf->resp.resp_iu.response_data_len),
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tmf->resp.resp_iu.resp_data[0],
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tmf->resp.resp_iu.resp_data[1],
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tmf->resp.resp_iu.resp_data[2],
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tmf->resp.resp_iu.resp_data[3]);
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}
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int isci_task_execute_task(
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struct sas_task *task,
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int num,
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gfp_t gfp_flags);
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int isci_task_abort_task(
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struct sas_task *task);
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int isci_task_abort_task_set(
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struct domain_device *d_device,
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u8 *lun);
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int isci_task_clear_aca(
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struct domain_device *d_device,
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u8 *lun);
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int isci_task_clear_task_set(
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struct domain_device *d_device,
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u8 *lun);
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int isci_task_query_task(
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struct sas_task *task);
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int isci_task_lu_reset(
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struct domain_device *d_device,
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u8 *lun);
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int isci_task_clear_nexus_port(
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struct asd_sas_port *port);
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int isci_task_clear_nexus_ha(
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struct sas_ha_struct *ha);
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int isci_task_I_T_nexus_reset(
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struct domain_device *d_device);
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void isci_task_request_complete(
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struct isci_host *isci_host,
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struct isci_request *request,
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enum sci_task_status completion_status);
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u16 isci_task_ssp_request_get_io_tag_to_manage(
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struct isci_request *request);
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u8 isci_task_ssp_request_get_function(
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struct isci_request *request);
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void *isci_task_ssp_request_get_response_data_address(
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struct isci_request *request);
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u32 isci_task_ssp_request_get_response_data_length(
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struct isci_request *request);
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int isci_queuecommand(
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struct scsi_cmnd *scsi_cmd,
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void (*donefunc)(struct scsi_cmnd *));
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int isci_bus_reset_handler(struct scsi_cmnd *cmd);
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/**
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* enum isci_completion_selection - This enum defines the possible actions to
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* take with respect to a given request's notification back to libsas.
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*
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*
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*/
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enum isci_completion_selection {
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isci_perform_normal_io_completion, /* Normal notify (task_done) */
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isci_perform_aborted_io_completion, /* No notification. */
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isci_perform_error_io_completion /* Use sas_task_abort */
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};
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static inline void isci_set_task_doneflags(
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struct sas_task *task)
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{
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/* Since no futher action will be taken on this task,
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* make sure to mark it complete from the lldd perspective.
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*/
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task->task_state_flags |= SAS_TASK_STATE_DONE;
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task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
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task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
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}
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/**
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* isci_task_all_done() - This function clears the task bits to indicate the
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* LLDD is done with the task.
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*
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*
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*/
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static inline void isci_task_all_done(
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struct sas_task *task)
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{
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unsigned long flags;
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/* Since no futher action will be taken on this task,
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* make sure to mark it complete from the lldd perspective.
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*/
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spin_lock_irqsave(&task->task_state_lock, flags);
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isci_set_task_doneflags(task);
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spin_unlock_irqrestore(&task->task_state_lock, flags);
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}
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/**
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* isci_task_set_completion_status() - This function sets the completion status
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* for the request.
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* @task: This parameter is the completed request.
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* @response: This parameter is the response code for the completed task.
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* @status: This parameter is the status code for the completed task.
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*
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* @return The new notification mode for the request.
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*/
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static inline enum isci_completion_selection
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isci_task_set_completion_status(
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struct sas_task *task,
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enum service_response response,
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enum exec_status status,
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enum isci_completion_selection task_notification_selection)
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{
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unsigned long flags;
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spin_lock_irqsave(&task->task_state_lock, flags);
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/* If a device reset is being indicated, make sure the I/O
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* is in the error path.
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*/
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if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET) {
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/* Fail the I/O to make sure it goes into the error path. */
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response = SAS_TASK_UNDELIVERED;
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status = SAM_STAT_TASK_ABORTED;
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task_notification_selection = isci_perform_error_io_completion;
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}
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task->task_status.resp = response;
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task->task_status.stat = status;
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switch (task_notification_selection) {
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case isci_perform_error_io_completion:
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if (task->task_proto == SAS_PROTOCOL_SMP) {
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/* There is no error escalation in the SMP case.
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* Convert to a normal completion to avoid the
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* timeout in the discovery path and to let the
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* next action take place quickly.
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*/
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task_notification_selection
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= isci_perform_normal_io_completion;
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/* Fall through to the normal case... */
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} else {
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/* Use sas_task_abort */
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/* Leave SAS_TASK_STATE_DONE clear
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* Leave SAS_TASK_AT_INITIATOR set.
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*/
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break;
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}
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case isci_perform_aborted_io_completion:
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/* This path can occur with task-managed requests as well as
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* requests terminated because of LUN or device resets.
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*/
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/* Fall through to the normal case... */
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case isci_perform_normal_io_completion:
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/* Normal notification (task_done) */
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isci_set_task_doneflags(task);
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break;
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default:
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WARN_ONCE(1, "unknown task_notification_selection: %d\n",
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task_notification_selection);
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break;
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}
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spin_unlock_irqrestore(&task->task_state_lock, flags);
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return task_notification_selection;
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}
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/**
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* isci_execpath_callback() - This function is called from the task
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* execute path when the task needs to callback libsas about the submit-time
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* task failure. The callback occurs either through the task's done function
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* or through sas_task_abort. In the case of regular non-discovery SATA/STP I/O
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* requests, libsas takes the host lock before calling execute task. Therefore
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* in this situation the host lock must be managed before calling the func.
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*
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* @ihost: This parameter is the controller to which the I/O request was sent.
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* @task: This parameter is the I/O request.
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* @func: This parameter is the function to call in the correct context.
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* @status: This parameter is the status code for the completed task.
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*
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*/
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static inline void isci_execpath_callback(struct isci_host *ihost,
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struct sas_task *task,
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void (*func)(struct sas_task *))
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{
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struct domain_device *dev = task->dev;
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if (dev_is_sata(dev) && task->uldd_task) {
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unsigned long flags;
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/* Since we are still in the submit path, and since
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* libsas takes the host lock on behalf of SATA
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* devices before I/O starts (in the non-discovery case),
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* we need to unlock before we can call the callback function.
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*/
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raw_local_irq_save(flags);
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spin_unlock(dev->sata_dev.ap->lock);
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func(task);
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spin_lock(dev->sata_dev.ap->lock);
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raw_local_irq_restore(flags);
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} else
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func(task);
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}
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#endif /* !defined(_SCI_TASK_H_) */
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