drivers/scsi/isci/sata.c

   1 /*
   2  * This file is provided under a dual BSD/GPLv2 license.  When using or
   3  * redistributing this file, you may do so under either license.
   4  *
   5  * GPL LICENSE SUMMARY
   6  *
   7  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called LICENSE.GPL.
  23  *
  24  * BSD LICENSE
  25  *
  26  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
  27  * All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  *
  33  *   * Redistributions of source code must retain the above copyright
  34  *     notice, this list of conditions and the following disclaimer.
  35  *   * Redistributions in binary form must reproduce the above copyright
  36  *     notice, this list of conditions and the following disclaimer in
  37  *     the documentation and/or other materials provided with the
  38  *     distribution.
  39  *   * Neither the name of Intel Corporation nor the names of its
  40  *     contributors may be used to endorse or promote products derived
  41  *     from this software without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  44  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  45  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  46  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  47  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  48  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  49  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  50  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  51  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  52  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  53  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  54  */
  55
  56 #include <scsi/sas.h>
  57 #include "isci.h"
  58 #include "remote_device.h"
  59 #include "scic_io_request.h"
  60 #include "scic_task_request.h"
  61 #include "task.h"
  62 #include "request.h"
  63 #include "sata.h"
  64
  65 /**
  66  * isci_sata_task_to_fis_copy() - This function gets the host_to_dev_fis from
  67  *    the core and copies the fis from the task into it.
  68  * @task: This parameter is a pointer to the task struct from libsas.
  69  *
  70  * pointer to the host_to_dev_fis from the core request object.
  71  */
  72 struct host_to_dev_fis *isci_sata_task_to_fis_copy(struct sas_task *task)
  73 {
  74         struct isci_request *ireq = task->lldd_task;
  75         struct host_to_dev_fis *fis = &ireq->sci.stp.cmd;
  76
  77         memcpy(fis, &task->ata_task.fis, sizeof(struct host_to_dev_fis));
  78
  79         if (!task->ata_task.device_control_reg_update)
  80                 fis->flags |= 0x80;
  81
  82         fis->flags &= 0xF0;
  83
  84         return fis;
  85 }
  86
  87 /**
  88  * isci_sata_is_task_ncq() - This function determines if the given stp task is
  89  *    a ncq request.
  90  * @task: This parameter is a pointer to the task struct from libsas.
  91  *
  92  * true if the task is ncq
  93  */
  94 bool isci_sata_is_task_ncq(struct sas_task *task)
  95 {
  96         struct ata_queued_cmd *qc = task->uldd_task;
  97
  98         bool ret = (qc &&
  99                     (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
 100                      qc->tf.command == ATA_CMD_FPDMA_READ));
 101
 102         return ret;
 103 }
 104
 105 /**
 106  * isci_sata_set_ncq_tag() - This function sets the ncq tag field in the
 107  *    host_to_dev_fis equal to the tag in the queue command in the task.
 108  * @task: This parameter is a pointer to the task struct from libsas.
 109  * @register_fis: This parameter is a pointer to the host_to_dev_fis from the
 110  *    core request object.
 111  *
 112  */
 113 void isci_sata_set_ncq_tag(
 114         struct host_to_dev_fis *register_fis,
 115         struct sas_task *task)
 116 {
 117         struct ata_queued_cmd *qc = task->uldd_task;
 118         struct isci_request *request = task->lldd_task;
 119
 120         register_fis->sector_count = qc->tag << 3;
 121         scic_stp_io_request_set_ncq_tag(&request->sci, qc->tag);
 122 }
 123
 124 /**
 125  * isci_request_process_stp_response() - This function sets the status and
 126  *    response, in the task struct, from the request object for the upper layer
 127  *    driver.
 128  * @sas_task: This parameter is the task struct from the upper layer driver.
 129  * @response_buffer: This parameter points to the response of the completed
 130  *    request.
 131  *
 132  * none.
 133  */
 134 void isci_request_process_stp_response(struct sas_task *task,
 135                                        void *response_buffer)
 136 {
 137         struct dev_to_host_fis *d2h_reg_fis = response_buffer;
 138         struct task_status_struct *ts = &task->task_status;
 139         struct ata_task_resp *resp = (void *)&ts->buf[0];
 140
 141         resp->frame_len = le16_to_cpu(*(__le16 *)(response_buffer + 6));
 142         memcpy(&resp->ending_fis[0], response_buffer + 16, 24);
 143         ts->buf_valid_size = sizeof(*resp);
 144
 145         /**
 146          * If the device fault bit is set in the status register, then
 147          * set the sense data and return.
 148          */
 149         if (d2h_reg_fis->status & ATA_DF)
 150                 ts->stat = SAS_PROTO_RESPONSE;
 151         else
 152                 ts->stat = SAM_STAT_GOOD;
 153
 154         ts->resp = SAS_TASK_COMPLETE;
 155 }
 156
 157 enum sci_status isci_sata_management_task_request_build(struct isci_request *ireq)
 158 {
 159         struct scic_sds_request *sci_req = &ireq->sci;
 160         struct isci_tmf *isci_tmf;
 161         enum sci_status status;
 162
 163         if (tmf_task != ireq->ttype)
 164                 return SCI_FAILURE;
 165
 166         isci_tmf = isci_request_access_tmf(ireq);
 167
 168         switch (isci_tmf->tmf_code) {
 169
 170         case isci_tmf_sata_srst_high:
 171         case isci_tmf_sata_srst_low: {
 172                 struct host_to_dev_fis *fis = &sci_req->stp.cmd;
 173
 174                 memset(fis, 0, sizeof(*fis));
 175
 176                 fis->fis_type  =  0x27;
 177                 fis->flags     &= ~0x80;
 178                 fis->flags     &= 0xF0;
 179                 if (isci_tmf->tmf_code == isci_tmf_sata_srst_high)
 180                         fis->control |= ATA_SRST;
 181                 else
 182                         fis->control &= ~ATA_SRST;
 183                 break;
 184         }
 185         /* other management commnd go here... */
 186         default:
 187                 return SCI_FAILURE;
 188         }
 189
 190         /* core builds the protocol specific request
 191          *  based on the h2d fis.
 192          */
 193         status = scic_task_request_construct_sata(&ireq->sci);
 194
 195         return status;
 196 }
 197
 198 /**
 199  * isci_task_send_lu_reset_sata() - This function is called by of the SAS
 200  *    Domain Template functions. This is one of the Task Management functoins
 201  *    called by libsas, to reset the given SAS lun. Note the assumption that
 202  *    while this call is executing, no I/O will be sent by the host to the
 203  *    device.
 204  * @lun: This parameter specifies the lun to be reset.
 205  *
 206  * status, zero indicates success.
 207  */
 208 int isci_task_send_lu_reset_sata(
 209         struct isci_host *isci_host,
 210         struct isci_remote_device *isci_device,
 211         u8 *lun)
 212 {
 213         struct isci_tmf tmf;
 214         int ret = TMF_RESP_FUNC_FAILED;
 215
 216         /* Send the soft reset to the target */
 217         #define ISCI_SRST_TIMEOUT_MS 25000 /* 25 second timeout. */
 218         isci_task_build_tmf(&tmf, isci_device, isci_tmf_sata_srst_high,
 219                             NULL, NULL
 220                             );
 221
 222         ret = isci_task_execute_tmf(isci_host, &tmf, ISCI_SRST_TIMEOUT_MS);
 223
 224         if (ret != TMF_RESP_FUNC_COMPLETE) {
 225                 dev_warn(&isci_host->pdev->dev,
 226                          "%s: Assert SRST failed (%p) = %x",
 227                          __func__,
 228                          isci_device,
 229                          ret);
 230
 231                 /* Return the failure so that the LUN reset is escalated
 232                  * to a target reset.
 233                  */
 234         }
 235         return ret;
 236 }