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_) */ 388