drivers/scsi/isci/task.h

   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.
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  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
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  53  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  54  */
  55 #ifndef _ISCI_TASK_H_
  56 #define _ISCI_TASK_H_
  57
  58 #include <scsi/sas_ata.h>
  59 #include "host.h"
  60
  61 struct isci_request;
  62
  63 /**
  64  * enum isci_tmf_cb_state - This enum defines the possible states in which the
  65  *    TMF callback function is invoked during the TMF execution process.
  66  *
  67  *
  68  */
  69 enum isci_tmf_cb_state {
  70
  71         isci_tmf_init_state = 0,
  72         isci_tmf_started,
  73         isci_tmf_timed_out
  74 };
  75
  76 /**
  77  * enum isci_tmf_function_codes - This enum defines the possible preparations
  78  *    of task management requests.
  79  *
  80  *
  81  */
  82 enum isci_tmf_function_codes {
  83
  84         isci_tmf_func_none      = 0,
  85         isci_tmf_ssp_task_abort = TMF_ABORT_TASK,
  86         isci_tmf_ssp_lun_reset  = TMF_LU_RESET,
  87         isci_tmf_sata_srst_high = TMF_LU_RESET + 0x100, /* Non SCSI */
  88         isci_tmf_sata_srst_low  = TMF_LU_RESET + 0x101  /* Non SCSI */
  89 };
  90 /**
  91  * struct isci_tmf - This class represents the task management object which
  92  *    acts as an interface to libsas for processing task management requests
  93  *
  94  *
  95  */
  96 struct isci_tmf {
  97
  98         struct completion *complete;
  99         enum sas_protocol proto;
 100         union {
 101                 struct ssp_response_iu resp_iu;
 102                 struct dev_to_host_fis d2h_fis;
 103                 u8 rsp_buf[SSP_RESP_IU_MAX_SIZE];
 104         } resp;
 105         unsigned char lun[8];
 106         u16 io_tag;
 107         struct isci_remote_device *device;
 108         enum isci_tmf_function_codes tmf_code;
 109         int status;
 110
 111         /* The optional callback function allows the user process to
 112          * track the TMF transmit / timeout conditions.
 113          */
 114         void (*cb_state_func)(
 115                 enum isci_tmf_cb_state,
 116                 struct isci_tmf *, void *);
 117         void *cb_data;
 118
 119 };
 120
 121 static inline void isci_print_tmf(struct isci_tmf *tmf)
 122 {
 123         if (SAS_PROTOCOL_SATA == tmf->proto)
 124                 dev_dbg(&tmf->device->isci_port->isci_host->pdev->dev,
 125                         "%s: status = %x\n"
 126                         "tmf->resp.d2h_fis.status = %x\n"
 127                         "tmf->resp.d2h_fis.error = %x\n",
 128                         __func__,
 129                         tmf->status,
 130                         tmf->resp.d2h_fis.status,
 131                         tmf->resp.d2h_fis.error);
 132         else
 133                 dev_dbg(&tmf->device->isci_port->isci_host->pdev->dev,
 134                         "%s: status = %x\n"
 135                         "tmf->resp.resp_iu.data_present = %x\n"
 136                         "tmf->resp.resp_iu.status = %x\n"
 137                         "tmf->resp.resp_iu.data_length = %x\n"
 138                         "tmf->resp.resp_iu.data[0] = %x\n"
 139                         "tmf->resp.resp_iu.data[1] = %x\n"
 140                         "tmf->resp.resp_iu.data[2] = %x\n"
 141                         "tmf->resp.resp_iu.data[3] = %x\n",
 142                         __func__,
 143                         tmf->status,
 144                         tmf->resp.resp_iu.datapres,
 145                         tmf->resp.resp_iu.status,
 146                         be32_to_cpu(tmf->resp.resp_iu.response_data_len),
 147                         tmf->resp.resp_iu.resp_data[0],
 148                         tmf->resp.resp_iu.resp_data[1],
 149                         tmf->resp.resp_iu.resp_data[2],
 150                         tmf->resp.resp_iu.resp_data[3]);
 151 }
 152
 153
 154 int isci_task_execute_task(
 155         struct sas_task *task,
 156         int num,
 157         gfp_t gfp_flags);
 158
 159 int isci_task_abort_task(
 160         struct sas_task *task);
 161
 162 int isci_task_abort_task_set(
 163         struct domain_device *d_device,
 164         u8 *lun);
 165
 166 int isci_task_clear_aca(
 167         struct domain_device *d_device,
 168         u8 *lun);
 169
 170 int isci_task_clear_task_set(
 171         struct domain_device *d_device,
 172         u8 *lun);
 173
 174 int isci_task_query_task(
 175         struct sas_task *task);
 176
 177 int isci_task_lu_reset(
 178         struct domain_device *d_device,
 179         u8 *lun);
 180
 181 int isci_task_clear_nexus_port(
 182         struct asd_sas_port *port);
 183
 184 int isci_task_clear_nexus_ha(
 185         struct sas_ha_struct *ha);
 186
 187 int isci_task_I_T_nexus_reset(
 188         struct domain_device *d_device);
 189
 190 void isci_task_request_complete(
 191         struct isci_host *isci_host,
 192         struct isci_request *request,
 193         enum sci_task_status completion_status);
 194
 195 u16 isci_task_ssp_request_get_io_tag_to_manage(
 196         struct isci_request *request);
 197
 198 u8 isci_task_ssp_request_get_function(
 199         struct isci_request *request);
 200
 201
 202 void *isci_task_ssp_request_get_response_data_address(
 203         struct isci_request *request);
 204
 205 u32 isci_task_ssp_request_get_response_data_length(
 206         struct isci_request *request);
 207
 208 int isci_queuecommand(
 209         struct scsi_cmnd *scsi_cmd,
 210         void (*donefunc)(struct scsi_cmnd *));
 211
 212 int isci_bus_reset_handler(struct scsi_cmnd *cmd);
 213
 214 /**
 215  * enum isci_completion_selection - This enum defines the possible actions to
 216  *    take with respect to a given request's notification back to libsas.
 217  *
 218  *
 219  */
 220 enum isci_completion_selection {
 221
 222         isci_perform_normal_io_completion,      /* Normal notify (task_done) */
 223         isci_perform_aborted_io_completion,     /* No notification.   */
 224         isci_perform_error_io_completion        /* Use sas_task_abort */
 225 };
 226
 227 static inline void isci_set_task_doneflags(
 228         struct sas_task *task)
 229 {
 230         /* Since no futher action will be taken on this task,
 231          * make sure to mark it complete from the lldd perspective.
 232          */
 233         task->task_state_flags |= SAS_TASK_STATE_DONE;
 234         task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
 235         task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
 236 }
 237 /**
 238  * isci_task_all_done() - This function clears the task bits to indicate the
 239  *    LLDD is done with the task.
 240  *
 241  *
 242  */
 243 static inline void isci_task_all_done(
 244         struct sas_task *task)
 245 {
 246         unsigned long flags;
 247
 248         /* Since no futher action will be taken on this task,
 249          * make sure to mark it complete from the lldd perspective.
 250          */
 251         spin_lock_irqsave(&task->task_state_lock, flags);
 252         isci_set_task_doneflags(task);
 253         spin_unlock_irqrestore(&task->task_state_lock, flags);
 254 }
 255
 256 /**
 257  * isci_task_set_completion_status() - This function sets the completion status
 258  *    for the request.
 259  * @task: This parameter is the completed request.
 260  * @response: This parameter is the response code for the completed task.
 261  * @status: This parameter is the status code for the completed task.
 262  *
 263 * @return The new notification mode for the request.
 264 */
 265 static inline enum isci_completion_selection
 266 isci_task_set_completion_status(
 267         struct sas_task *task,
 268         enum service_response response,
 269         enum exec_status status,
 270         enum isci_completion_selection task_notification_selection)
 271 {
 272         unsigned long flags;
 273
 274         spin_lock_irqsave(&task->task_state_lock, flags);
 275
 276         /* If a device reset is being indicated, make sure the I/O
 277         * is in the error path.
 278         */
 279         if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET) {
 280                 /* Fail the I/O to make sure it goes into the error path. */
 281                 response = SAS_TASK_UNDELIVERED;
 282                 status = SAM_STAT_TASK_ABORTED;
 283
 284                 task_notification_selection = isci_perform_error_io_completion;
 285         }
 286         task->task_status.resp = response;
 287         task->task_status.stat = status;
 288
 289         switch (task->task_proto) {
 290
 291         case SAS_PROTOCOL_SATA:
 292         case SAS_PROTOCOL_STP:
 293         case SAS_PROTOCOL_SATA | SAS_PROTOCOL_STP:
 294
 295                 if (task_notification_selection
 296                     == isci_perform_error_io_completion) {
 297                         /* SATA/STP I/O has it's own means of scheduling device
 298                         * error handling on the normal path.
 299                         */
 300                         task_notification_selection
 301                                 = isci_perform_normal_io_completion;
 302                 }
 303                 break;
 304         default:
 305                 break;
 306         }
 307
 308         switch (task_notification_selection) {
 309
 310         case isci_perform_error_io_completion:
 311
 312                 if (task->task_proto == SAS_PROTOCOL_SMP) {
 313                         /* There is no error escalation in the SMP case.
 314                          * Convert to a normal completion to avoid the
 315                          * timeout in the discovery path and to let the
 316                          * next action take place quickly.
 317                          */
 318                         task_notification_selection
 319                                 = isci_perform_normal_io_completion;
 320
 321                         /* Fall through to the normal case... */
 322                 } else {
 323                         /* Use sas_task_abort */
 324                         /* Leave SAS_TASK_STATE_DONE clear
 325                          * Leave SAS_TASK_AT_INITIATOR set.
 326                          */
 327                         break;
 328                 }
 329
 330         case isci_perform_aborted_io_completion:
 331                 /* This path can occur with task-managed requests as well as
 332                  * requests terminated because of LUN or device resets.
 333                  */
 334                 /* Fall through to the normal case... */
 335         case isci_perform_normal_io_completion:
 336                 /* Normal notification (task_done) */
 337                 isci_set_task_doneflags(task);
 338                 break;
 339         default:
 340                 WARN_ONCE(1, "unknown task_notification_selection: %d\n",
 341                          task_notification_selection);
 342                 break;
 343         }
 344
 345         spin_unlock_irqrestore(&task->task_state_lock, flags);
 346
 347         return task_notification_selection;
 348
 349 }
 350 /**
 351 * isci_execpath_callback() - This function is called from the task
 352 * execute path when the task needs to callback libsas about the submit-time
 353 * task failure.  The callback occurs either through the task's done function
 354 * or through sas_task_abort.  In the case of regular non-discovery SATA/STP I/O
 355 * requests, libsas takes the host lock before calling execute task.  Therefore
 356 * in this situation the host lock must be managed before calling the func.
 357 *
 358 * @ihost: This parameter is the controller to which the I/O request was sent.
 359 * @task: This parameter is the I/O request.
 360 * @func: This parameter is the function to call in the correct context.
 361 * @status: This parameter is the status code for the completed task.
 362 *
 363 */
 364 static inline void isci_execpath_callback(struct isci_host *ihost,
 365                                           struct sas_task  *task,
 366                                           void (*func)(struct sas_task *))
 367 {
 368         struct domain_device *dev = task->dev;
 369
 370         if (dev_is_sata(dev) && task->uldd_task) {
 371                 unsigned long flags;
 372
 373                 /* Since we are still in the submit path, and since
 374                  * libsas takes the host lock on behalf of SATA
 375                  * devices before I/O starts (in the non-discovery case),
 376                  * we need to unlock before we can call the callback function.
 377                  */
 378                 raw_local_irq_save(flags);
 379                 spin_unlock(dev->sata_dev.ap->lock);
 380                 func(task);
 381                 spin_lock(dev->sata_dev.ap->lock);
 382                 raw_local_irq_restore(flags);
 383         } else
 384                 func(task);
 385 }
 386 #endif /* !defined(_SCI_TASK_H_) */