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 "task.h"
  60 #include "request.h"
  61 #include "sata.h"
  62
  63 /**
  64  * isci_sata_task_to_fis_copy() - This function gets the host_to_dev_fis from
  65  *    the core and copies the fis from the task into it.
  66  * @task: This parameter is a pointer to the task struct from libsas.
  67  *
  68  * pointer to the host_to_dev_fis from the core request object.
  69  */
  70 struct host_to_dev_fis *isci_sata_task_to_fis_copy(struct sas_task *task)
  71 {
  72         struct isci_request *ireq = task->lldd_task;
  73         struct host_to_dev_fis *fis = &ireq->sci.stp.cmd;
  74
  75         memcpy(fis, &task->ata_task.fis, sizeof(struct host_to_dev_fis));
  76
  77         if (!task->ata_task.device_control_reg_update)
  78                 fis->flags |= 0x80;
  79
  80         fis->flags &= 0xF0;
  81
  82         return fis;
  83 }
  84
  85 /**
  86  * isci_sata_is_task_ncq() - This function determines if the given stp task is
  87  *    a ncq request.
  88  * @task: This parameter is a pointer to the task struct from libsas.
  89  *
  90  * true if the task is ncq
  91  */
  92 bool isci_sata_is_task_ncq(struct sas_task *task)
  93 {
  94         struct ata_queued_cmd *qc = task->uldd_task;
  95
  96         bool ret = (qc &&
  97                     (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
  98                      qc->tf.command == ATA_CMD_FPDMA_READ));
  99
 100         return ret;
 101 }
 102
 103 /**
 104  * isci_sata_set_ncq_tag() - This function sets the ncq tag field in the
 105  *    host_to_dev_fis equal to the tag in the queue command in the task.
 106  * @task: This parameter is a pointer to the task struct from libsas.
 107  * @register_fis: This parameter is a pointer to the host_to_dev_fis from the
 108  *    core request object.
 109  *
 110  */
 111 void isci_sata_set_ncq_tag(
 112         struct host_to_dev_fis *register_fis,
 113         struct sas_task *task)
 114 {
 115         struct ata_queued_cmd *qc = task->uldd_task;
 116         struct isci_request *request = task->lldd_task;
 117
 118         register_fis->sector_count = qc->tag << 3;
 119         scic_stp_io_request_set_ncq_tag(&request->sci, qc->tag);
 120 }
 121
 122 /**
 123  * isci_request_process_stp_response() - This function sets the status and
 124  *    response, in the task struct, from the request object for the upper layer
 125  *    driver.
 126  * @sas_task: This parameter is the task struct from the upper layer driver.
 127  * @response_buffer: This parameter points to the response of the completed
 128  *    request.
 129  *
 130  * none.
 131  */
 132 void isci_request_process_stp_response(struct sas_task *task,
 133                                        void *response_buffer)
 134 {
 135         struct dev_to_host_fis *d2h_reg_fis = response_buffer;
 136         struct task_status_struct *ts = &task->task_status;
 137         struct ata_task_resp *resp = (void *)&ts->buf[0];
 138
 139         resp->frame_len = le16_to_cpu(*(__le16 *)(response_buffer + 6));
 140         memcpy(&resp->ending_fis[0], response_buffer + 16, 24);
 141         ts->buf_valid_size = sizeof(*resp);
 142
 143         /**
 144          * If the device fault bit is set in the status register, then
 145          * set the sense data and return.
 146          */
 147         if (d2h_reg_fis->status & ATA_DF)
 148                 ts->stat = SAS_PROTO_RESPONSE;
 149         else
 150                 ts->stat = SAM_STAT_GOOD;
 151
 152         ts->resp = SAS_TASK_COMPLETE;
 153 }
 154
 155 enum sci_status isci_sata_management_task_request_build(struct isci_request *ireq)
 156 {
 157         struct scic_sds_request *sci_req = &ireq->sci;
 158         struct isci_tmf *isci_tmf;
 159         enum sci_status status;
 160
 161         if (tmf_task != ireq->ttype)
 162                 return SCI_FAILURE;
 163
 164         isci_tmf = isci_request_access_tmf(ireq);
 165
 166         switch (isci_tmf->tmf_code) {
 167
 168         case isci_tmf_sata_srst_high:
 169         case isci_tmf_sata_srst_low: {
 170                 struct host_to_dev_fis *fis = &sci_req->stp.cmd;
 171
 172                 memset(fis, 0, sizeof(*fis));
 173
 174                 fis->fis_type  =  0x27;
 175                 fis->flags     &= ~0x80;
 176                 fis->flags     &= 0xF0;
 177                 if (isci_tmf->tmf_code == isci_tmf_sata_srst_high)
 178                         fis->control |= ATA_SRST;
 179                 else
 180                         fis->control &= ~ATA_SRST;
 181                 break;
 182         }
 183         /* other management commnd go here... */
 184         default:
 185                 return SCI_FAILURE;
 186         }
 187
 188         /* core builds the protocol specific request
 189          *  based on the h2d fis.
 190          */
 191         status = scic_task_request_construct_sata(&ireq->sci);
 192
 193         return status;
 194 }
 195
 196 /**
 197  * isci_task_send_lu_reset_sata() - This function is called by of the SAS
 198  *    Domain Template functions. This is one of the Task Management functoins
 199  *    called by libsas, to reset the given SAS lun. Note the assumption that
 200  *    while this call is executing, no I/O will be sent by the host to the
 201  *    device.
 202  * @lun: This parameter specifies the lun to be reset.
 203  *
 204  * status, zero indicates success.
 205  */
 206 int isci_task_send_lu_reset_sata(
 207         struct isci_host *isci_host,
 208         struct isci_remote_device *isci_device,
 209         u8 *lun)
 210 {
 211         struct isci_tmf tmf;
 212         int ret = TMF_RESP_FUNC_FAILED;
 213
 214         /* Send the soft reset to the target */
 215         #define ISCI_SRST_TIMEOUT_MS 25000 /* 25 second timeout. */
 216         isci_task_build_tmf(&tmf, isci_device, isci_tmf_sata_srst_high,
 217                             NULL, NULL
 218                             );
 219
 220         ret = isci_task_execute_tmf(isci_host, &tmf, ISCI_SRST_TIMEOUT_MS);
 221
 222         if (ret != TMF_RESP_FUNC_COMPLETE) {
 223                 dev_warn(&isci_host->pdev->dev,
 224                          "%s: Assert SRST failed (%p) = %x",
 225                          __func__,
 226                          isci_device,
 227                          ret);
 228
 229                 /* Return the failure so that the LUN reset is escalated
 230                  * to a target reset.
 231                  */
 232         }
 233         return ret;
 234 }