drivers/scsi/isci/remote_device.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.
  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 #ifndef _ISCI_REMOTE_DEVICE_H_
  57 #define _ISCI_REMOTE_DEVICE_H_
  58 #include <scsi/libsas.h>
  59 #include <linux/kref.h>
  60 #include "scu_remote_node_context.h"
  61 #include "remote_node_context.h"
  62 #include "port.h"
  63
  64 enum sci_remote_device_not_ready_reason_code {
  65         SCIC_REMOTE_DEVICE_NOT_READY_START_REQUESTED,
  66         SCIC_REMOTE_DEVICE_NOT_READY_STOP_REQUESTED,
  67         SCIC_REMOTE_DEVICE_NOT_READY_SATA_REQUEST_STARTED,
  68         SCIC_REMOTE_DEVICE_NOT_READY_SATA_SDB_ERROR_FIS_RECEIVED,
  69         SCIC_REMOTE_DEVICE_NOT_READY_SMP_REQUEST_STARTED,
  70         SCIC_REMOTE_DEVICE_NOT_READY_REASON_CODE_MAX
  71 };
  72
  73 /**
  74  * isci_remote_device - isci representation of a sas expander / end point
  75  * @device_port_width: hw setting for number of simultaneous connections
  76  * @connection_rate: per-taskcontext connection rate for this device
  77  * @working_request: SATA requests have no tag we for unaccelerated
  78  *                   protocols we need a method to associate unsolicited
  79  *                   frames with a pending request
  80  */
  81 struct isci_remote_device {
  82         #define IDEV_START_PENDING 0
  83         #define IDEV_STOP_PENDING 1
  84         #define IDEV_ALLOCATED 2
  85         #define IDEV_GONE 3
  86         #define IDEV_IO_READY 4
  87         #define IDEV_IO_NCQERROR 5
  88         #define IDEV_RNC_LLHANG_ENABLED 6
  89         #define IDEV_ABORT_PATH_ACTIVE 7
  90         #define IDEV_ABORT_PATH_RESUME_PENDING 8
  91         unsigned long flags;
  92         struct kref kref;
  93         struct isci_port *isci_port;
  94         struct domain_device *domain_dev;
  95         struct list_head node;
  96         struct sci_base_state_machine sm;
  97         u32 device_port_width;
  98         enum sas_linkrate connection_rate;
  99         struct isci_port *owning_port;
 100         struct sci_remote_node_context rnc;
 101         /* XXX unify with device reference counting and delete */
 102         u32 started_request_count;
 103         struct isci_request *working_request;
 104         u32 not_ready_reason;
 105         scics_sds_remote_node_context_callback abort_resume_cb;
 106         void *abort_resume_cbparam;
 107 };
 108
 109 #define ISCI_REMOTE_DEVICE_START_TIMEOUT 5000
 110
 111 /* device reference routines must be called under sci_lock */
 112 static inline struct isci_remote_device *isci_get_device(
 113         struct isci_remote_device *idev)
 114 {
 115         if (idev)
 116                 kref_get(&idev->kref);
 117         return idev;
 118 }
 119
 120 static inline struct isci_remote_device *isci_lookup_device(struct domain_device *dev)
 121 {
 122         struct isci_remote_device *idev = dev->lldd_dev;
 123
 124         if (idev && !test_bit(IDEV_GONE, &idev->flags)) {
 125                 kref_get(&idev->kref);
 126                 return idev;
 127         }
 128
 129         return NULL;
 130 }
 131
 132 void isci_remote_device_release(struct kref *kref);
 133 static inline void isci_put_device(struct isci_remote_device *idev)
 134 {
 135         if (idev)
 136                 kref_put(&idev->kref, isci_remote_device_release);
 137 }
 138
 139 enum sci_status isci_remote_device_stop(struct isci_host *ihost,
 140                                         struct isci_remote_device *idev);
 141 void isci_remote_device_nuke_requests(struct isci_host *ihost,
 142                                       struct isci_remote_device *idev);
 143 void isci_remote_device_gone(struct domain_device *domain_dev);
 144 int isci_remote_device_found(struct domain_device *domain_dev);
 145
 146 /**
 147  * sci_remote_device_stop() - This method will stop both transmission and
 148  *    reception of link activity for the supplied remote device.  This method
 149  *    disables normal IO requests from flowing through to the remote device.
 150  * @remote_device: This parameter specifies the device to be stopped.
 151  * @timeout: This parameter specifies the number of milliseconds in which the
 152  *    stop operation should complete.
 153  *
 154  * An indication of whether the device was successfully stopped. SCI_SUCCESS
 155  * This value is returned if the transmission and reception for the device was
 156  * successfully stopped.
 157  */
 158 enum sci_status sci_remote_device_stop(
 159         struct isci_remote_device *idev,
 160         u32 timeout);
 161
 162 /**
 163  * sci_remote_device_reset() - This method will reset the device making it
 164  *    ready for operation. This method must be called anytime the device is
 165  *    reset either through a SMP phy control or a port hard reset request.
 166  * @remote_device: This parameter specifies the device to be reset.
 167  *
 168  * This method does not actually cause the device hardware to be reset. This
 169  * method resets the software object so that it will be operational after a
 170  * device hardware reset completes. An indication of whether the device reset
 171  * was accepted. SCI_SUCCESS This value is returned if the device reset is
 172  * started.
 173  */
 174 enum sci_status sci_remote_device_reset(
 175         struct isci_remote_device *idev);
 176
 177 /**
 178  * sci_remote_device_reset_complete() - This method informs the device object
 179  *    that the reset operation is complete and the device can resume operation
 180  *    again.
 181  * @remote_device: This parameter specifies the device which is to be informed
 182  *    of the reset complete operation.
 183  *
 184  * An indication that the device is resuming operation. SCI_SUCCESS the device
 185  * is resuming operation.
 186  */
 187 enum sci_status sci_remote_device_reset_complete(
 188         struct isci_remote_device *idev);
 189
 190 /**
 191  * enum sci_remote_device_states - This enumeration depicts all the states
 192  *    for the common remote device state machine.
 193  * @SCI_DEV_INITIAL: Simply the initial state for the base remote device
 194  * state machine.
 195  *
 196  * @SCI_DEV_STOPPED: This state indicates that the remote device has
 197  * successfully been stopped.  In this state no new IO operations are
 198  * permitted.  This state is entered from the INITIAL state.  This state
 199  * is entered from the STOPPING state.
 200  *
 201  * @SCI_DEV_STARTING: This state indicates the the remote device is in
 202  * the process of becoming ready (i.e. starting).  In this state no new
 203  * IO operations are permitted.  This state is entered from the STOPPED
 204  * state.
 205  *
 206  * @SCI_DEV_READY: This state indicates the remote device is now ready.
 207  * Thus, the user is able to perform IO operations on the remote device.
 208  * This state is entered from the STARTING state.
 209  *
 210  * @SCI_STP_DEV_IDLE: This is the idle substate for the stp remote
 211  * device.  When there are no active IO for the device it is is in this
 212  * state.
 213  *
 214  * @SCI_STP_DEV_CMD: This is the command state for for the STP remote
 215  * device.  This state is entered when the device is processing a
 216  * non-NCQ command.  The device object will fail any new start IO
 217  * requests until this command is complete.
 218  *
 219  * @SCI_STP_DEV_NCQ: This is the NCQ state for the STP remote device.
 220  * This state is entered when the device is processing an NCQ reuqest.
 221  * It will remain in this state so long as there is one or more NCQ
 222  * requests being processed.
 223  *
 224  * @SCI_STP_DEV_NCQ_ERROR: This is the NCQ error state for the STP
 225  * remote device.  This state is entered when an SDB error FIS is
 226  * received by the device object while in the NCQ state.  The device
 227  * object will only accept a READ LOG command while in this state.
 228  *
 229  * @SCI_STP_DEV_ATAPI_ERROR: This is the ATAPI error state for the STP
 230  * ATAPI remote device.  This state is entered when ATAPI device sends
 231  * error status FIS without data while the device object is in CMD
 232  * state.  A suspension event is expected in this state.  The device
 233  * object will resume right away.
 234  *
 235  * @SCI_STP_DEV_AWAIT_RESET: This is the READY substate indicates the
 236  * device is waiting for the RESET task coming to be recovered from
 237  * certain hardware specific error.
 238  *
 239  * @SCI_SMP_DEV_IDLE: This is the ready operational substate for the
 240  * remote device.  This is the normal operational state for a remote
 241  * device.
 242  *
 243  * @SCI_SMP_DEV_CMD: This is the suspended state for the remote device.
 244  * This is the state that the device is placed in when a RNC suspend is
 245  * received by the SCU hardware.
 246  *
 247  * @SCI_DEV_STOPPING: This state indicates that the remote device is in
 248  * the process of stopping.  In this state no new IO operations are
 249  * permitted, but existing IO operations are allowed to complete.  This
 250  * state is entered from the READY state.  This state is entered from
 251  * the FAILED state.
 252  *
 253  * @SCI_DEV_FAILED: This state indicates that the remote device has
 254  * failed.  In this state no new IO operations are permitted.  This
 255  * state is entered from the INITIALIZING state.  This state is entered
 256  * from the READY state.
 257  *
 258  * @SCI_DEV_RESETTING: This state indicates the device is being reset.
 259  * In this state no new IO operations are permitted.  This state is
 260  * entered from the READY state.
 261  *
 262  * @SCI_DEV_FINAL: Simply the final state for the base remote device
 263  * state machine.
 264  */
 265 #define REMOTE_DEV_STATES {\
 266         C(DEV_INITIAL),\
 267         C(DEV_STOPPED),\
 268         C(DEV_STARTING),\
 269         C(DEV_READY),\
 270         C(STP_DEV_IDLE),\
 271         C(STP_DEV_CMD),\
 272         C(STP_DEV_NCQ),\
 273         C(STP_DEV_NCQ_ERROR),\
 274         C(STP_DEV_ATAPI_ERROR),\
 275         C(STP_DEV_AWAIT_RESET),\
 276         C(SMP_DEV_IDLE),\
 277         C(SMP_DEV_CMD),\
 278         C(DEV_STOPPING),\
 279         C(DEV_FAILED),\
 280         C(DEV_RESETTING),\
 281         C(DEV_FINAL),\
 282         }
 283 #undef C
 284 #define C(a) SCI_##a
 285 enum sci_remote_device_states REMOTE_DEV_STATES;
 286 #undef C
 287 const char *dev_state_name(enum sci_remote_device_states state);
 288
 289 static inline struct isci_remote_device *rnc_to_dev(struct sci_remote_node_context *rnc)
 290 {
 291         struct isci_remote_device *idev;
 292
 293         idev = container_of(rnc, typeof(*idev), rnc);
 294
 295         return idev;
 296 }
 297
 298 static inline bool dev_is_expander(struct domain_device *dev)
 299 {
 300         return dev->dev_type == SAS_EDGE_EXPANDER_DEVICE || dev->dev_type == SAS_FANOUT_EXPANDER_DEVICE;
 301 }
 302
 303 static inline void sci_remote_device_decrement_request_count(struct isci_remote_device *idev)
 304 {
 305         /* XXX delete this voodoo when converting to the top-level device
 306          * reference count
 307          */
 308         if (WARN_ONCE(idev->started_request_count == 0,
 309                       "%s: tried to decrement started_request_count past 0!?",
 310                         __func__))
 311                 /* pass */;
 312         else
 313                 idev->started_request_count--;
 314 }
 315
 316 void isci_dev_set_hang_detection_timeout(struct isci_remote_device *idev, u32 timeout);
 317
 318 enum sci_status sci_remote_device_frame_handler(
 319         struct isci_remote_device *idev,
 320         u32 frame_index);
 321
 322 enum sci_status sci_remote_device_event_handler(
 323         struct isci_remote_device *idev,
 324         u32 event_code);
 325
 326 enum sci_status sci_remote_device_start_io(
 327         struct isci_host *ihost,
 328         struct isci_remote_device *idev,
 329         struct isci_request *ireq);
 330
 331 enum sci_status sci_remote_device_start_task(
 332         struct isci_host *ihost,
 333         struct isci_remote_device *idev,
 334         struct isci_request *ireq);
 335
 336 enum sci_status sci_remote_device_complete_io(
 337         struct isci_host *ihost,
 338         struct isci_remote_device *idev,
 339         struct isci_request *ireq);
 340
 341 void sci_remote_device_post_request(
 342         struct isci_remote_device *idev,
 343         u32 request);
 344
 345 enum sci_status sci_remote_device_terminate_requests(
 346         struct isci_remote_device *idev);
 347
 348 int isci_remote_device_is_safe_to_abort(
 349         struct isci_remote_device *idev);
 350
 351 enum sci_status
 352 sci_remote_device_abort_requests_pending_abort(
 353         struct isci_remote_device *idev);
 354
 355 enum sci_status isci_remote_device_suspend(
 356         struct isci_host *ihost,
 357         struct isci_remote_device *idev);
 358
 359 enum sci_status sci_remote_device_resume(
 360         struct isci_remote_device *idev,
 361         scics_sds_remote_node_context_callback cb_fn,
 362         void *cb_p);
 363
 364 enum sci_status isci_remote_device_resume_from_abort(
 365         struct isci_host *ihost,
 366         struct isci_remote_device *idev);
 367
 368 enum sci_status isci_remote_device_reset(
 369         struct isci_host *ihost,
 370         struct isci_remote_device *idev);
 371
 372 enum sci_status isci_remote_device_reset_complete(
 373         struct isci_host *ihost,
 374         struct isci_remote_device *idev);
 375
 376 enum sci_status isci_remote_device_suspend_terminate(
 377         struct isci_host *ihost,
 378         struct isci_remote_device *idev,
 379         struct isci_request *ireq);
 380
 381 enum sci_status isci_remote_device_terminate_requests(
 382         struct isci_host *ihost,
 383         struct isci_remote_device *idev,
 384         struct isci_request *ireq);
 385 enum sci_status sci_remote_device_suspend(struct isci_remote_device *idev,
 386                                           enum sci_remote_node_suspension_reasons reason);
 387 #endif /* !defined(_ISCI_REMOTE_DEVICE_H_) */