drivers/scsi/isci/remote_device.h

   1 /*
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   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.
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  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
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  34  *     notice, this list of conditions and the following disclaimer.
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  41  *     from this software without specific prior written permission.
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  43  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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  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         unsigned long flags;
  89         struct kref kref;
  90         struct isci_port *isci_port;
  91         struct domain_device *domain_dev;
  92         struct list_head node;
  93         struct list_head reqs_in_process;
  94         struct sci_base_state_machine sm;
  95         u32 device_port_width;
  96         enum sas_linkrate connection_rate;
  97         bool is_direct_attached;
  98         struct isci_port *owning_port;
  99         struct sci_remote_node_context rnc;
 100         /* XXX unify with device reference counting and delete */
 101         u32 started_request_count;
 102         struct isci_request *working_request;
 103         u32 not_ready_reason;
 104 };
 105
 106 #define ISCI_REMOTE_DEVICE_START_TIMEOUT 5000
 107
 108 /* device reference routines must be called under sci_lock */
 109 static inline struct isci_remote_device *isci_lookup_device(struct domain_device *dev)
 110 {
 111         struct isci_remote_device *idev = dev->lldd_dev;
 112
 113         if (idev && !test_bit(IDEV_GONE, &idev->flags)) {
 114                 kref_get(&idev->kref);
 115                 return idev;
 116         }
 117
 118         return NULL;
 119 }
 120
 121 void isci_remote_device_release(struct kref *kref);
 122 static inline void isci_put_device(struct isci_remote_device *idev)
 123 {
 124         if (idev)
 125                 kref_put(&idev->kref, isci_remote_device_release);
 126 }
 127
 128 enum sci_status isci_remote_device_stop(struct isci_host *ihost,
 129                                         struct isci_remote_device *idev);
 130 void isci_remote_device_nuke_requests(struct isci_host *ihost,
 131                                       struct isci_remote_device *idev);
 132 void isci_remote_device_gone(struct domain_device *domain_dev);
 133 int isci_remote_device_found(struct domain_device *domain_dev);
 134
 135 /**
 136  * sci_remote_device_stop() - This method will stop both transmission and
 137  *    reception of link activity for the supplied remote device.  This method
 138  *    disables normal IO requests from flowing through to the remote device.
 139  * @remote_device: This parameter specifies the device to be stopped.
 140  * @timeout: This parameter specifies the number of milliseconds in which the
 141  *    stop operation should complete.
 142  *
 143  * An indication of whether the device was successfully stopped. SCI_SUCCESS
 144  * This value is returned if the transmission and reception for the device was
 145  * successfully stopped.
 146  */
 147 enum sci_status sci_remote_device_stop(
 148         struct isci_remote_device *idev,
 149         u32 timeout);
 150
 151 /**
 152  * sci_remote_device_reset() - This method will reset the device making it
 153  *    ready for operation. This method must be called anytime the device is
 154  *    reset either through a SMP phy control or a port hard reset request.
 155  * @remote_device: This parameter specifies the device to be reset.
 156  *
 157  * This method does not actually cause the device hardware to be reset. This
 158  * method resets the software object so that it will be operational after a
 159  * device hardware reset completes. An indication of whether the device reset
 160  * was accepted. SCI_SUCCESS This value is returned if the device reset is
 161  * started.
 162  */
 163 enum sci_status sci_remote_device_reset(
 164         struct isci_remote_device *idev);
 165
 166 /**
 167  * sci_remote_device_reset_complete() - This method informs the device object
 168  *    that the reset operation is complete and the device can resume operation
 169  *    again.
 170  * @remote_device: This parameter specifies the device which is to be informed
 171  *    of the reset complete operation.
 172  *
 173  * An indication that the device is resuming operation. SCI_SUCCESS the device
 174  * is resuming operation.
 175  */
 176 enum sci_status sci_remote_device_reset_complete(
 177         struct isci_remote_device *idev);
 178
 179 /**
 180  * enum sci_remote_device_states - This enumeration depicts all the states
 181  *    for the common remote device state machine.
 182  * @SCI_DEV_INITIAL: Simply the initial state for the base remote device
 183  * state machine.
 184  *
 185  * @SCI_DEV_STOPPED: This state indicates that the remote device has
 186  * successfully been stopped.  In this state no new IO operations are
 187  * permitted.  This state is entered from the INITIAL state.  This state
 188  * is entered from the STOPPING state.
 189  *
 190  * @SCI_DEV_STARTING: This state indicates the the remote device is in
 191  * the process of becoming ready (i.e. starting).  In this state no new
 192  * IO operations are permitted.  This state is entered from the STOPPED
 193  * state.
 194  *
 195  * @SCI_DEV_READY: This state indicates the remote device is now ready.
 196  * Thus, the user is able to perform IO operations on the remote device.
 197  * This state is entered from the STARTING state.
 198  *
 199  * @SCI_STP_DEV_IDLE: This is the idle substate for the stp remote
 200  * device.  When there are no active IO for the device it is is in this
 201  * state.
 202  *
 203  * @SCI_STP_DEV_CMD: This is the command state for for the STP remote
 204  * device.  This state is entered when the device is processing a
 205  * non-NCQ command.  The device object will fail any new start IO
 206  * requests until this command is complete.
 207  *
 208  * @SCI_STP_DEV_NCQ: This is the NCQ state for the STP remote device.
 209  * This state is entered when the device is processing an NCQ reuqest.
 210  * It will remain in this state so long as there is one or more NCQ
 211  * requests being processed.
 212  *
 213  * @SCI_STP_DEV_NCQ_ERROR: This is the NCQ error state for the STP
 214  * remote device.  This state is entered when an SDB error FIS is
 215  * received by the device object while in the NCQ state.  The device
 216  * object will only accept a READ LOG command while in this state.
 217  *
 218  * @SCI_STP_DEV_ATAPI_ERROR: This is the ATAPI error state for the STP
 219  * ATAPI remote device.  This state is entered when ATAPI device sends
 220  * error status FIS without data while the device object is in CMD
 221  * state.  A suspension event is expected in this state.  The device
 222  * object will resume right away.
 223  *
 224  * @SCI_STP_DEV_AWAIT_RESET: This is the READY substate indicates the
 225  * device is waiting for the RESET task coming to be recovered from
 226  * certain hardware specific error.
 227  *
 228  * @SCI_SMP_DEV_IDLE: This is the ready operational substate for the
 229  * remote device.  This is the normal operational state for a remote
 230  * device.
 231  *
 232  * @SCI_SMP_DEV_CMD: This is the suspended state for the remote device.
 233  * This is the state that the device is placed in when a RNC suspend is
 234  * received by the SCU hardware.
 235  *
 236  * @SCI_DEV_STOPPING: This state indicates that the remote device is in
 237  * the process of stopping.  In this state no new IO operations are
 238  * permitted, but existing IO operations are allowed to complete.  This
 239  * state is entered from the READY state.  This state is entered from
 240  * the FAILED state.
 241  *
 242  * @SCI_DEV_FAILED: This state indicates that the remote device has
 243  * failed.  In this state no new IO operations are permitted.  This
 244  * state is entered from the INITIALIZING state.  This state is entered
 245  * from the READY state.
 246  *
 247  * @SCI_DEV_RESETTING: This state indicates the device is being reset.
 248  * In this state no new IO operations are permitted.  This state is
 249  * entered from the READY state.
 250  *
 251  * @SCI_DEV_FINAL: Simply the final state for the base remote device
 252  * state machine.
 253  */
 254 #define REMOTE_DEV_STATES {\
 255         C(DEV_INITIAL),\
 256         C(DEV_STOPPED),\
 257         C(DEV_STARTING),\
 258         C(DEV_READY),\
 259         C(STP_DEV_IDLE),\
 260         C(STP_DEV_CMD),\
 261         C(STP_DEV_NCQ),\
 262         C(STP_DEV_NCQ_ERROR),\
 263         C(STP_DEV_ATAPI_ERROR),\
 264         C(STP_DEV_AWAIT_RESET),\
 265         C(SMP_DEV_IDLE),\
 266         C(SMP_DEV_CMD),\
 267         C(DEV_STOPPING),\
 268         C(DEV_FAILED),\
 269         C(DEV_RESETTING),\
 270         C(DEV_FINAL),\
 271         }
 272 #undef C
 273 #define C(a) SCI_##a
 274 enum sci_remote_device_states REMOTE_DEV_STATES;
 275 #undef C
 276 const char *dev_state_name(enum sci_remote_device_states state);
 277
 278 static inline struct isci_remote_device *rnc_to_dev(struct sci_remote_node_context *rnc)
 279 {
 280         struct isci_remote_device *idev;
 281
 282         idev = container_of(rnc, typeof(*idev), rnc);
 283
 284         return idev;
 285 }
 286
 287 static inline bool dev_is_expander(struct domain_device *dev)
 288 {
 289         return dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV;
 290 }
 291
 292 static inline void sci_remote_device_decrement_request_count(struct isci_remote_device *idev)
 293 {
 294         /* XXX delete this voodoo when converting to the top-level device
 295          * reference count
 296          */
 297         if (WARN_ONCE(idev->started_request_count == 0,
 298                       "%s: tried to decrement started_request_count past 0!?",
 299                         __func__))
 300                 /* pass */;
 301         else
 302                 idev->started_request_count--;
 303 }
 304
 305 enum sci_status sci_remote_device_frame_handler(
 306         struct isci_remote_device *idev,
 307         u32 frame_index);
 308
 309 enum sci_status sci_remote_device_event_handler(
 310         struct isci_remote_device *idev,
 311         u32 event_code);
 312
 313 enum sci_status sci_remote_device_start_io(
 314         struct isci_host *ihost,
 315         struct isci_remote_device *idev,
 316         struct isci_request *ireq);
 317
 318 enum sci_status sci_remote_device_start_task(
 319         struct isci_host *ihost,
 320         struct isci_remote_device *idev,
 321         struct isci_request *ireq);
 322
 323 enum sci_status sci_remote_device_complete_io(
 324         struct isci_host *ihost,
 325         struct isci_remote_device *idev,
 326         struct isci_request *ireq);
 327
 328 enum sci_status sci_remote_device_suspend(
 329         struct isci_remote_device *idev,
 330         u32 suspend_type);
 331
 332 void sci_remote_device_post_request(
 333         struct isci_remote_device *idev,
 334         u32 request);
 335
 336 #endif /* !defined(_ISCI_REMOTE_DEVICE_H_) */