Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * linux/drivers/s390/scsi/zfcp_scsi.c |
| 4 | * |
| 5 | * FCP adapter driver for IBM eServer zSeries |
| 6 | * |
| 7 | * (C) Copyright IBM Corp. 2002, 2004 |
| 8 | * |
| 9 | * Author(s): Martin Peschke <mpeschke@de.ibm.com> |
| 10 | * Raimund Schroeder <raimund.schroeder@de.ibm.com> |
| 11 | * Aron Zeh |
| 12 | * Wolfgang Taphorn |
| 13 | * Stefan Bader <stefan.bader@de.ibm.com> |
| 14 | * Heiko Carstens <heiko.carstens@de.ibm.com> |
| 15 | * Andreas Herrmann <aherrman@de.ibm.com> |
| 16 | * |
| 17 | * This program is free software; you can redistribute it and/or modify |
| 18 | * it under the terms of the GNU General Public License as published by |
| 19 | * the Free Software Foundation; either version 2, or (at your option) |
| 20 | * any later version. |
| 21 | * |
| 22 | * This program is distributed in the hope that it will be useful, |
| 23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 25 | * GNU General Public License for more details. |
| 26 | * |
| 27 | * You should have received a copy of the GNU General Public License |
| 28 | * along with this program; if not, write to the Free Software |
| 29 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 30 | */ |
| 31 | |
| 32 | #define ZFCP_LOG_AREA ZFCP_LOG_AREA_SCSI |
| 33 | |
| 34 | #define ZFCP_SCSI_REVISION "$Revision: 1.74 $" |
| 35 | |
| 36 | #include "zfcp_ext.h" |
| 37 | |
| 38 | static void zfcp_scsi_slave_destroy(struct scsi_device *sdp); |
| 39 | static int zfcp_scsi_slave_alloc(struct scsi_device *sdp); |
| 40 | static int zfcp_scsi_slave_configure(struct scsi_device *sdp); |
| 41 | static int zfcp_scsi_queuecommand(struct scsi_cmnd *, |
| 42 | void (*done) (struct scsi_cmnd *)); |
| 43 | static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *); |
| 44 | static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *); |
| 45 | static int zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *); |
| 46 | static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *); |
| 47 | static int zfcp_task_management_function(struct zfcp_unit *, u8); |
| 48 | |
| 49 | static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int, scsi_id_t, |
| 50 | scsi_lun_t); |
| 51 | static struct zfcp_port *zfcp_port_lookup(struct zfcp_adapter *, int, |
| 52 | scsi_id_t); |
| 53 | |
| 54 | static struct device_attribute *zfcp_sysfs_sdev_attrs[]; |
| 55 | |
| 56 | struct scsi_transport_template *zfcp_transport_template; |
| 57 | |
| 58 | struct zfcp_data zfcp_data = { |
| 59 | .scsi_host_template = { |
| 60 | name: ZFCP_NAME, |
| 61 | proc_name: "zfcp", |
| 62 | proc_info: NULL, |
| 63 | detect: NULL, |
| 64 | slave_alloc: zfcp_scsi_slave_alloc, |
| 65 | slave_configure: zfcp_scsi_slave_configure, |
| 66 | slave_destroy: zfcp_scsi_slave_destroy, |
| 67 | queuecommand: zfcp_scsi_queuecommand, |
| 68 | eh_abort_handler: zfcp_scsi_eh_abort_handler, |
| 69 | eh_device_reset_handler: zfcp_scsi_eh_device_reset_handler, |
| 70 | eh_bus_reset_handler: zfcp_scsi_eh_bus_reset_handler, |
| 71 | eh_host_reset_handler: zfcp_scsi_eh_host_reset_handler, |
| 72 | /* FIXME(openfcp): Tune */ |
| 73 | can_queue: 4096, |
| 74 | this_id: 0, |
| 75 | /* |
| 76 | * FIXME: |
| 77 | * one less? can zfcp_create_sbale cope with it? |
| 78 | */ |
| 79 | sg_tablesize: ZFCP_MAX_SBALES_PER_REQ, |
| 80 | cmd_per_lun: 1, |
| 81 | unchecked_isa_dma: 0, |
| 82 | use_clustering: 1, |
| 83 | sdev_attrs: zfcp_sysfs_sdev_attrs, |
| 84 | }, |
| 85 | .driver_version = ZFCP_VERSION, |
| 86 | /* rest initialised with zeros */ |
| 87 | }; |
| 88 | |
| 89 | /* Find start of Response Information in FCP response unit*/ |
| 90 | char * |
| 91 | zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) |
| 92 | { |
| 93 | char *fcp_rsp_info_ptr; |
| 94 | |
| 95 | fcp_rsp_info_ptr = |
| 96 | (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu)); |
| 97 | |
| 98 | return fcp_rsp_info_ptr; |
| 99 | } |
| 100 | |
| 101 | /* Find start of Sense Information in FCP response unit*/ |
| 102 | char * |
| 103 | zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) |
| 104 | { |
| 105 | char *fcp_sns_info_ptr; |
| 106 | |
| 107 | fcp_sns_info_ptr = |
| 108 | (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu)); |
| 109 | if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid) |
| 110 | fcp_sns_info_ptr = (char *) fcp_sns_info_ptr + |
| 111 | fcp_rsp_iu->fcp_rsp_len; |
| 112 | |
| 113 | return fcp_sns_info_ptr; |
| 114 | } |
| 115 | |
| 116 | fcp_dl_t * |
| 117 | zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd) |
| 118 | { |
| 119 | int additional_length = fcp_cmd->add_fcp_cdb_length << 2; |
| 120 | fcp_dl_t *fcp_dl_addr; |
| 121 | |
| 122 | fcp_dl_addr = (fcp_dl_t *) |
| 123 | ((unsigned char *) fcp_cmd + |
| 124 | sizeof (struct fcp_cmnd_iu) + additional_length); |
| 125 | /* |
| 126 | * fcp_dl_addr = start address of fcp_cmnd structure + |
| 127 | * size of fixed part + size of dynamically sized add_dcp_cdb field |
| 128 | * SEE FCP-2 documentation |
| 129 | */ |
| 130 | return fcp_dl_addr; |
| 131 | } |
| 132 | |
| 133 | fcp_dl_t |
| 134 | zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd) |
| 135 | { |
| 136 | return *zfcp_get_fcp_dl_ptr(fcp_cmd); |
| 137 | } |
| 138 | |
| 139 | void |
| 140 | zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl) |
| 141 | { |
| 142 | *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl; |
| 143 | } |
| 144 | |
| 145 | /* |
| 146 | * note: it's a bit-or operation not an assignment |
| 147 | * regarding the specified byte |
| 148 | */ |
| 149 | static inline void |
| 150 | set_byte(u32 * result, char status, char pos) |
| 151 | { |
| 152 | *result |= status << (pos * 8); |
| 153 | } |
| 154 | |
| 155 | void |
| 156 | set_host_byte(u32 * result, char status) |
| 157 | { |
| 158 | set_byte(result, status, 2); |
| 159 | } |
| 160 | |
| 161 | void |
| 162 | set_driver_byte(u32 * result, char status) |
| 163 | { |
| 164 | set_byte(result, status, 3); |
| 165 | } |
| 166 | |
| 167 | /* |
| 168 | * function: zfcp_scsi_slave_alloc |
| 169 | * |
| 170 | * purpose: |
| 171 | * |
| 172 | * returns: |
| 173 | */ |
| 174 | |
| 175 | static int |
| 176 | zfcp_scsi_slave_alloc(struct scsi_device *sdp) |
| 177 | { |
| 178 | struct zfcp_adapter *adapter; |
| 179 | struct zfcp_unit *unit; |
| 180 | unsigned long flags; |
| 181 | int retval = -ENODEV; |
| 182 | |
| 183 | adapter = (struct zfcp_adapter *) sdp->host->hostdata[0]; |
| 184 | if (!adapter) |
| 185 | goto out; |
| 186 | |
| 187 | read_lock_irqsave(&zfcp_data.config_lock, flags); |
| 188 | unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun); |
| 189 | if (unit) { |
| 190 | sdp->hostdata = unit; |
| 191 | unit->device = sdp; |
| 192 | zfcp_unit_get(unit); |
| 193 | retval = 0; |
| 194 | } |
| 195 | read_unlock_irqrestore(&zfcp_data.config_lock, flags); |
| 196 | out: |
| 197 | return retval; |
| 198 | } |
| 199 | |
| 200 | /* |
| 201 | * function: zfcp_scsi_slave_destroy |
| 202 | * |
| 203 | * purpose: |
| 204 | * |
| 205 | * returns: |
| 206 | */ |
| 207 | |
| 208 | static void |
| 209 | zfcp_scsi_slave_destroy(struct scsi_device *sdpnt) |
| 210 | { |
| 211 | struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata; |
| 212 | |
| 213 | if (unit) { |
| 214 | sdpnt->hostdata = NULL; |
| 215 | unit->device = NULL; |
| 216 | zfcp_unit_put(unit); |
| 217 | } else { |
| 218 | ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at " |
| 219 | "address %p\n", sdpnt); |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | /* |
| 224 | * called from scsi midlayer to allow finetuning of a device. |
| 225 | */ |
| 226 | static int |
| 227 | zfcp_scsi_slave_configure(struct scsi_device *sdp) |
| 228 | { |
| 229 | if (sdp->tagged_supported) |
| 230 | scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN); |
| 231 | else |
| 232 | scsi_adjust_queue_depth(sdp, 0, 1); |
| 233 | return 0; |
| 234 | } |
| 235 | |
| 236 | /** |
| 237 | * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function |
| 238 | * @scpnt: pointer to struct scsi_cmnd where result is set |
| 239 | * @result: result to be set in scpnt (e.g. DID_ERROR) |
| 240 | */ |
| 241 | static void |
| 242 | zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result) |
| 243 | { |
| 244 | set_host_byte(&scpnt->result, result); |
| 245 | zfcp_cmd_dbf_event_scsi("failing", scpnt); |
| 246 | /* return directly */ |
| 247 | scpnt->scsi_done(scpnt); |
| 248 | } |
| 249 | |
| 250 | /** |
| 251 | * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and |
| 252 | * zfcp_scsi_command_sync |
| 253 | * @adapter: adapter where scsi command is issued |
| 254 | * @unit: unit to which scsi command is sent |
| 255 | * @scpnt: scsi command to be sent |
| 256 | * @timer: timer to be started if request is successfully initiated |
| 257 | * |
| 258 | * Note: In scsi_done function must be set in scpnt. |
| 259 | */ |
| 260 | int |
| 261 | zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit, |
| 262 | struct scsi_cmnd *scpnt, struct timer_list *timer) |
| 263 | { |
| 264 | int tmp; |
| 265 | int retval; |
| 266 | |
| 267 | retval = 0; |
| 268 | |
| 269 | BUG_ON((adapter == NULL) || (adapter != unit->port->adapter)); |
| 270 | BUG_ON(scpnt->scsi_done == NULL); |
| 271 | |
| 272 | if (unlikely(NULL == unit)) { |
| 273 | zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT); |
| 274 | goto out; |
| 275 | } |
| 276 | |
| 277 | if (unlikely( |
| 278 | atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) || |
| 279 | !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) { |
| 280 | ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port " |
| 281 | "0x%016Lx on adapter %s\n", |
| 282 | unit->fcp_lun, unit->port->wwpn, |
| 283 | zfcp_get_busid_by_adapter(adapter)); |
| 284 | zfcp_scsi_command_fail(scpnt, DID_ERROR); |
| 285 | goto out; |
| 286 | } |
| 287 | |
| 288 | if (unlikely( |
| 289 | !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) { |
| 290 | ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx " |
| 291 | "on port 0x%016Lx in recovery\n", |
| 292 | zfcp_get_busid_by_unit(unit), |
| 293 | unit->fcp_lun, unit->port->wwpn); |
| 294 | retval = SCSI_MLQUEUE_DEVICE_BUSY; |
| 295 | goto out; |
| 296 | } |
| 297 | |
| 298 | tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, timer, |
| 299 | ZFCP_REQ_AUTO_CLEANUP); |
| 300 | |
| 301 | if (unlikely(tmp < 0)) { |
| 302 | ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n"); |
| 303 | retval = SCSI_MLQUEUE_HOST_BUSY; |
| 304 | } |
| 305 | |
| 306 | out: |
| 307 | return retval; |
| 308 | } |
| 309 | |
| 310 | void |
| 311 | zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt) |
| 312 | { |
| 313 | struct completion *wait = (struct completion *) scpnt->SCp.ptr; |
| 314 | complete(wait); |
| 315 | } |
| 316 | |
| 317 | |
| 318 | /** |
| 319 | * zfcp_scsi_command_sync - send a SCSI command and wait for completion |
| 320 | * @unit: unit where command is sent to |
| 321 | * @scpnt: scsi command to be sent |
| 322 | * @timer: timer to be started if request is successfully initiated |
| 323 | * Return: 0 |
| 324 | * |
| 325 | * Errors are indicated in scpnt->result |
| 326 | */ |
| 327 | int |
| 328 | zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt, |
| 329 | struct timer_list *timer) |
| 330 | { |
| 331 | int ret; |
| 332 | DECLARE_COMPLETION(wait); |
| 333 | |
| 334 | scpnt->SCp.ptr = (void *) &wait; /* silent re-use */ |
| 335 | scpnt->scsi_done = zfcp_scsi_command_sync_handler; |
| 336 | ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, timer); |
| 337 | if (ret == 0) |
| 338 | wait_for_completion(&wait); |
| 339 | |
| 340 | scpnt->SCp.ptr = NULL; |
| 341 | |
| 342 | return 0; |
| 343 | } |
| 344 | |
| 345 | /* |
| 346 | * function: zfcp_scsi_queuecommand |
| 347 | * |
| 348 | * purpose: enqueues a SCSI command to the specified target device |
| 349 | * |
| 350 | * returns: 0 - success, SCSI command enqueued |
| 351 | * !0 - failure |
| 352 | */ |
| 353 | int |
| 354 | zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt, |
| 355 | void (*done) (struct scsi_cmnd *)) |
| 356 | { |
| 357 | struct zfcp_unit *unit; |
| 358 | struct zfcp_adapter *adapter; |
| 359 | |
| 360 | /* reset the status for this request */ |
| 361 | scpnt->result = 0; |
| 362 | scpnt->host_scribble = NULL; |
| 363 | scpnt->scsi_done = done; |
| 364 | |
| 365 | /* |
| 366 | * figure out adapter and target device |
| 367 | * (stored there by zfcp_scsi_slave_alloc) |
| 368 | */ |
| 369 | adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0]; |
| 370 | unit = (struct zfcp_unit *) scpnt->device->hostdata; |
| 371 | |
| 372 | return zfcp_scsi_command_async(adapter, unit, scpnt, NULL); |
| 373 | } |
| 374 | |
| 375 | /* |
| 376 | * function: zfcp_unit_lookup |
| 377 | * |
| 378 | * purpose: |
| 379 | * |
| 380 | * returns: |
| 381 | * |
| 382 | * context: |
| 383 | */ |
| 384 | static struct zfcp_unit * |
| 385 | zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id, |
| 386 | scsi_lun_t lun) |
| 387 | { |
| 388 | struct zfcp_port *port; |
| 389 | struct zfcp_unit *unit, *retval = NULL; |
| 390 | |
| 391 | list_for_each_entry(port, &adapter->port_list_head, list) { |
Andreas Herrmann | 3859f6a | 2005-08-27 11:07:54 -0700 | [diff] [blame] | 392 | if (!port->rport || (id != port->rport->scsi_target_id)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | continue; |
| 394 | list_for_each_entry(unit, &port->unit_list_head, list) { |
| 395 | if (lun == unit->scsi_lun) { |
| 396 | retval = unit; |
| 397 | goto out; |
| 398 | } |
| 399 | } |
| 400 | } |
| 401 | out: |
| 402 | return retval; |
| 403 | } |
| 404 | |
| 405 | static struct zfcp_port * |
| 406 | zfcp_port_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id) |
| 407 | { |
| 408 | struct zfcp_port *port; |
| 409 | |
| 410 | list_for_each_entry(port, &adapter->port_list_head, list) { |
Andreas Herrmann | 3859f6a | 2005-08-27 11:07:54 -0700 | [diff] [blame] | 411 | if (port->rport && (id == port->rport->scsi_target_id)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | return port; |
| 413 | } |
| 414 | return (struct zfcp_port *) NULL; |
| 415 | } |
| 416 | |
Andreas Herrmann | 059c97d | 2005-09-13 21:47:52 +0200 | [diff] [blame^] | 417 | /** |
| 418 | * zfcp_scsi_eh_abort_handler - abort the specified SCSI command |
| 419 | * @scpnt: pointer to scsi_cmnd to be aborted |
| 420 | * Return: SUCCESS - command has been aborted and cleaned up in internal |
| 421 | * bookkeeping, SCSI stack won't be called for aborted command |
| 422 | * FAILED - otherwise |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | * |
Andreas Herrmann | 059c97d | 2005-09-13 21:47:52 +0200 | [diff] [blame^] | 424 | * We do not need to care for a SCSI command which completes normally |
| 425 | * but late during this abort routine runs. We are allowed to return |
| 426 | * late commands to the SCSI stack. It tracks the state of commands and |
| 427 | * will handle late commands. (Usually, the normal completion of late |
| 428 | * commands is ignored with respect to the running abort operation.) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | */ |
| 430 | int |
Andreas Herrmann | 059c97d | 2005-09-13 21:47:52 +0200 | [diff] [blame^] | 431 | zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | { |
Andreas Herrmann | 059c97d | 2005-09-13 21:47:52 +0200 | [diff] [blame^] | 433 | struct Scsi_Host *scsi_host; |
| 434 | struct zfcp_adapter *adapter; |
| 435 | struct zfcp_unit *unit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | int retval = SUCCESS; |
| 437 | struct zfcp_fsf_req *new_fsf_req, *old_fsf_req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | |
Andreas Herrmann | 059c97d | 2005-09-13 21:47:52 +0200 | [diff] [blame^] | 440 | scsi_host = scpnt->device->host; |
| 441 | adapter = (struct zfcp_adapter *) scsi_host->hostdata[0]; |
| 442 | unit = (struct zfcp_unit *) scpnt->device->hostdata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | |
| 444 | ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n", |
| 445 | scpnt, zfcp_get_busid_by_adapter(adapter)); |
| 446 | |
Andreas Herrmann | 059c97d | 2005-09-13 21:47:52 +0200 | [diff] [blame^] | 447 | /* avoid race condition between late normal completion and abort */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | write_lock_irqsave(&adapter->abort_lock, flags); |
| 449 | |
| 450 | /* |
| 451 | * Check whether command has just completed and can not be aborted. |
| 452 | * Even if the command has just been completed late, we can access |
| 453 | * scpnt since the SCSI stack does not release it at least until |
| 454 | * this routine returns. (scpnt is parameter passed to this routine |
| 455 | * and must not disappear during abort even on late completion.) |
| 456 | */ |
Andreas Herrmann | 059c97d | 2005-09-13 21:47:52 +0200 | [diff] [blame^] | 457 | old_fsf_req = (struct zfcp_fsf_req *) scpnt->host_scribble; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | if (!old_fsf_req) { |
| 459 | write_unlock_irqrestore(&adapter->abort_lock, flags); |
| 460 | ZFCP_LOG_NORMAL("bug: no old fsf request found\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | ZFCP_LOG_NORMAL("scsi_cmnd:\n"); |
| 462 | ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL, |
| 463 | (char *) scpnt, sizeof (struct scsi_cmnd)); |
| 464 | retval = FAILED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | goto out; |
| 466 | } |
Andreas Herrmann | 059c97d | 2005-09-13 21:47:52 +0200 | [diff] [blame^] | 467 | old_fsf_req->data = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | |
Andreas Herrmann | 059c97d | 2005-09-13 21:47:52 +0200 | [diff] [blame^] | 470 | /* don't access old_fsf_req after releasing the abort_lock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | write_unlock_irqrestore(&adapter->abort_lock, flags); |
| 472 | /* call FSF routine which does the abort */ |
| 473 | new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req, |
| 474 | adapter, unit, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | if (!new_fsf_req) { |
| 476 | retval = FAILED; |
| 477 | ZFCP_LOG_NORMAL("error: initiation of Abort FCP Cmnd " |
| 478 | "failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | goto out; |
| 480 | } |
| 481 | |
| 482 | /* wait for completion of abort */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | __wait_event(new_fsf_req->completion_wq, |
| 484 | new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); |
Andreas Herrmann | 1db2c9c | 2005-06-13 13:20:35 +0200 | [diff] [blame] | 485 | zfcp_fsf_req_free(new_fsf_req); |
Andreas Herrmann | 059c97d | 2005-09-13 21:47:52 +0200 | [diff] [blame^] | 486 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | /* status should be valid since signals were not permitted */ |
Andreas Herrmann | 059c97d | 2005-09-13 21:47:52 +0200 | [diff] [blame^] | 488 | if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | retval = SUCCESS; |
Andreas Herrmann | 059c97d | 2005-09-13 21:47:52 +0200 | [diff] [blame^] | 490 | } else if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | retval = SUCCESS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | } else { |
| 493 | retval = FAILED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | return retval; |
| 497 | } |
| 498 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | /* |
| 500 | * function: zfcp_scsi_eh_device_reset_handler |
| 501 | * |
| 502 | * purpose: |
| 503 | * |
| 504 | * returns: |
| 505 | */ |
| 506 | int |
| 507 | zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) |
| 508 | { |
| 509 | int retval; |
| 510 | struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | if (!unit) { |
| 513 | ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n"); |
| 514 | retval = SUCCESS; |
| 515 | goto out; |
| 516 | } |
| 517 | ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun); |
| 518 | |
| 519 | /* |
| 520 | * If we do not know whether the unit supports 'logical unit reset' |
| 521 | * then try 'logical unit reset' and proceed with 'target reset' |
| 522 | * if 'logical unit reset' fails. |
| 523 | * If the unit is known not to support 'logical unit reset' then |
| 524 | * skip 'logical unit reset' and try 'target reset' immediately. |
| 525 | */ |
| 526 | if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, |
| 527 | &unit->status)) { |
| 528 | retval = |
| 529 | zfcp_task_management_function(unit, FCP_LOGICAL_UNIT_RESET); |
| 530 | if (retval) { |
| 531 | ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit); |
| 532 | if (retval == -ENOTSUPP) |
| 533 | atomic_set_mask |
| 534 | (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, |
| 535 | &unit->status); |
| 536 | /* fall through and try 'target reset' next */ |
| 537 | } else { |
| 538 | ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n", |
| 539 | unit); |
| 540 | /* avoid 'target reset' */ |
| 541 | retval = SUCCESS; |
| 542 | goto out; |
| 543 | } |
| 544 | } |
| 545 | retval = zfcp_task_management_function(unit, FCP_TARGET_RESET); |
| 546 | if (retval) { |
| 547 | ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit); |
| 548 | retval = FAILED; |
| 549 | } else { |
| 550 | ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit); |
| 551 | retval = SUCCESS; |
| 552 | } |
| 553 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | return retval; |
| 555 | } |
| 556 | |
| 557 | static int |
| 558 | zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags) |
| 559 | { |
| 560 | struct zfcp_adapter *adapter = unit->port->adapter; |
| 561 | int retval; |
| 562 | int status; |
| 563 | struct zfcp_fsf_req *fsf_req; |
| 564 | |
| 565 | /* issue task management function */ |
| 566 | fsf_req = zfcp_fsf_send_fcp_command_task_management |
| 567 | (adapter, unit, tm_flags, 0); |
| 568 | if (!fsf_req) { |
| 569 | ZFCP_LOG_INFO("error: creation of task management request " |
| 570 | "failed for unit 0x%016Lx on port 0x%016Lx on " |
| 571 | "adapter %s\n", unit->fcp_lun, unit->port->wwpn, |
| 572 | zfcp_get_busid_by_adapter(adapter)); |
| 573 | retval = -ENOMEM; |
| 574 | goto out; |
| 575 | } |
| 576 | |
| 577 | retval = zfcp_fsf_req_wait_and_cleanup(fsf_req, |
| 578 | ZFCP_UNINTERRUPTIBLE, &status); |
| 579 | /* |
| 580 | * check completion status of task management function |
| 581 | * (status should always be valid since no signals permitted) |
| 582 | */ |
| 583 | if (status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) |
| 584 | retval = -EIO; |
| 585 | else if (status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) |
| 586 | retval = -ENOTSUPP; |
| 587 | else |
| 588 | retval = 0; |
| 589 | out: |
| 590 | return retval; |
| 591 | } |
| 592 | |
| 593 | /* |
| 594 | * function: zfcp_scsi_eh_bus_reset_handler |
| 595 | * |
| 596 | * purpose: |
| 597 | * |
| 598 | * returns: |
| 599 | */ |
| 600 | int |
| 601 | zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt) |
| 602 | { |
| 603 | int retval = 0; |
| 604 | struct zfcp_unit *unit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | unit = (struct zfcp_unit *) scpnt->device->hostdata; |
| 607 | ZFCP_LOG_NORMAL("bus reset because of problems with " |
| 608 | "unit 0x%016Lx\n", unit->fcp_lun); |
| 609 | zfcp_erp_adapter_reopen(unit->port->adapter, 0); |
| 610 | zfcp_erp_wait(unit->port->adapter); |
| 611 | retval = SUCCESS; |
| 612 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | return retval; |
| 614 | } |
| 615 | |
| 616 | /* |
| 617 | * function: zfcp_scsi_eh_host_reset_handler |
| 618 | * |
| 619 | * purpose: |
| 620 | * |
| 621 | * returns: |
| 622 | */ |
| 623 | int |
| 624 | zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) |
| 625 | { |
| 626 | int retval = 0; |
| 627 | struct zfcp_unit *unit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | unit = (struct zfcp_unit *) scpnt->device->hostdata; |
| 630 | ZFCP_LOG_NORMAL("host reset because of problems with " |
| 631 | "unit 0x%016Lx\n", unit->fcp_lun); |
| 632 | zfcp_erp_adapter_reopen(unit->port->adapter, 0); |
| 633 | zfcp_erp_wait(unit->port->adapter); |
| 634 | retval = SUCCESS; |
| 635 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | return retval; |
| 637 | } |
| 638 | |
| 639 | /* |
| 640 | * function: |
| 641 | * |
| 642 | * purpose: |
| 643 | * |
| 644 | * returns: |
| 645 | */ |
| 646 | int |
| 647 | zfcp_adapter_scsi_register(struct zfcp_adapter *adapter) |
| 648 | { |
| 649 | int retval = 0; |
| 650 | static unsigned int unique_id = 0; |
| 651 | |
| 652 | /* register adapter as SCSI host with mid layer of SCSI stack */ |
| 653 | adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template, |
| 654 | sizeof (struct zfcp_adapter *)); |
| 655 | if (!adapter->scsi_host) { |
| 656 | ZFCP_LOG_NORMAL("error: registration with SCSI stack failed " |
| 657 | "for adapter %s ", |
| 658 | zfcp_get_busid_by_adapter(adapter)); |
| 659 | retval = -EIO; |
| 660 | goto out; |
| 661 | } |
| 662 | ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host); |
| 663 | |
| 664 | /* tell the SCSI stack some characteristics of this adapter */ |
| 665 | adapter->scsi_host->max_id = 1; |
| 666 | adapter->scsi_host->max_lun = 1; |
| 667 | adapter->scsi_host->max_channel = 0; |
| 668 | adapter->scsi_host->unique_id = unique_id++; /* FIXME */ |
| 669 | adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH; |
| 670 | adapter->scsi_host->transportt = zfcp_transport_template; |
| 671 | /* |
| 672 | * Reverse mapping of the host number to avoid race condition |
| 673 | */ |
| 674 | adapter->scsi_host_no = adapter->scsi_host->host_no; |
| 675 | |
| 676 | /* |
| 677 | * save a pointer to our own adapter data structure within |
| 678 | * hostdata field of SCSI host data structure |
| 679 | */ |
| 680 | adapter->scsi_host->hostdata[0] = (unsigned long) adapter; |
| 681 | |
| 682 | if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { |
| 683 | scsi_host_put(adapter->scsi_host); |
| 684 | retval = -EIO; |
| 685 | goto out; |
| 686 | } |
| 687 | atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); |
| 688 | out: |
| 689 | return retval; |
| 690 | } |
| 691 | |
| 692 | /* |
| 693 | * function: |
| 694 | * |
| 695 | * purpose: |
| 696 | * |
| 697 | * returns: |
| 698 | */ |
| 699 | void |
| 700 | zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter) |
| 701 | { |
| 702 | struct Scsi_Host *shost; |
| 703 | |
| 704 | shost = adapter->scsi_host; |
| 705 | if (!shost) |
| 706 | return; |
Andreas Herrmann | 3859f6a | 2005-08-27 11:07:54 -0700 | [diff] [blame] | 707 | fc_remove_host(shost); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | scsi_remove_host(shost); |
| 709 | scsi_host_put(shost); |
| 710 | adapter->scsi_host = NULL; |
| 711 | adapter->scsi_host_no = 0; |
| 712 | atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); |
| 713 | |
| 714 | return; |
| 715 | } |
| 716 | |
| 717 | |
| 718 | void |
| 719 | zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter) |
| 720 | { |
| 721 | adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler; |
| 722 | adapter->scsi_er_timer.data = (unsigned long) adapter; |
| 723 | adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT; |
| 724 | add_timer(&adapter->scsi_er_timer); |
| 725 | } |
| 726 | |
| 727 | /* |
| 728 | * Support functions for FC transport class |
| 729 | */ |
| 730 | static void |
| 731 | zfcp_get_port_id(struct scsi_target *starget) |
| 732 | { |
| 733 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
| 734 | struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0]; |
| 735 | struct zfcp_port *port; |
| 736 | unsigned long flags; |
| 737 | |
| 738 | read_lock_irqsave(&zfcp_data.config_lock, flags); |
| 739 | port = zfcp_port_lookup(adapter, starget->channel, starget->id); |
| 740 | if (port) |
| 741 | fc_starget_port_id(starget) = port->d_id; |
| 742 | else |
| 743 | fc_starget_port_id(starget) = -1; |
| 744 | read_unlock_irqrestore(&zfcp_data.config_lock, flags); |
| 745 | } |
| 746 | |
| 747 | static void |
| 748 | zfcp_get_port_name(struct scsi_target *starget) |
| 749 | { |
| 750 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
| 751 | struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0]; |
| 752 | struct zfcp_port *port; |
| 753 | unsigned long flags; |
| 754 | |
| 755 | read_lock_irqsave(&zfcp_data.config_lock, flags); |
| 756 | port = zfcp_port_lookup(adapter, starget->channel, starget->id); |
| 757 | if (port) |
| 758 | fc_starget_port_name(starget) = port->wwpn; |
| 759 | else |
| 760 | fc_starget_port_name(starget) = -1; |
| 761 | read_unlock_irqrestore(&zfcp_data.config_lock, flags); |
| 762 | } |
| 763 | |
| 764 | static void |
| 765 | zfcp_get_node_name(struct scsi_target *starget) |
| 766 | { |
| 767 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
| 768 | struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0]; |
| 769 | struct zfcp_port *port; |
| 770 | unsigned long flags; |
| 771 | |
| 772 | read_lock_irqsave(&zfcp_data.config_lock, flags); |
| 773 | port = zfcp_port_lookup(adapter, starget->channel, starget->id); |
| 774 | if (port) |
| 775 | fc_starget_node_name(starget) = port->wwnn; |
| 776 | else |
| 777 | fc_starget_node_name(starget) = -1; |
| 778 | read_unlock_irqrestore(&zfcp_data.config_lock, flags); |
| 779 | } |
| 780 | |
Andreas Herrmann | 3859f6a | 2005-08-27 11:07:54 -0700 | [diff] [blame] | 781 | void |
| 782 | zfcp_set_fc_host_attrs(struct zfcp_adapter *adapter) |
| 783 | { |
| 784 | struct Scsi_Host *shost = adapter->scsi_host; |
| 785 | |
| 786 | fc_host_node_name(shost) = adapter->wwnn; |
| 787 | fc_host_port_name(shost) = adapter->wwpn; |
| 788 | strncpy(fc_host_serial_number(shost), adapter->serial_number, |
| 789 | min(FC_SERIAL_NUMBER_SIZE, 32)); |
| 790 | fc_host_supported_classes(shost) = FC_COS_CLASS2 | FC_COS_CLASS3; |
| 791 | } |
| 792 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | struct fc_function_template zfcp_transport_functions = { |
| 794 | .get_starget_port_id = zfcp_get_port_id, |
| 795 | .get_starget_port_name = zfcp_get_port_name, |
| 796 | .get_starget_node_name = zfcp_get_node_name, |
| 797 | .show_starget_port_id = 1, |
| 798 | .show_starget_port_name = 1, |
| 799 | .show_starget_node_name = 1, |
Andreas Herrmann | 3859f6a | 2005-08-27 11:07:54 -0700 | [diff] [blame] | 800 | .show_rport_supported_classes = 1, |
| 801 | .show_host_node_name = 1, |
| 802 | .show_host_port_name = 1, |
| 803 | .show_host_supported_classes = 1, |
| 804 | .show_host_serial_number = 1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | }; |
| 806 | |
| 807 | /** |
| 808 | * ZFCP_DEFINE_SCSI_ATTR |
| 809 | * @_name: name of show attribute |
| 810 | * @_format: format string |
| 811 | * @_value: value to print |
| 812 | * |
| 813 | * Generates attribute for a unit. |
| 814 | */ |
| 815 | #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value) \ |
Yani Ioannou | 10523b3 | 2005-05-17 06:43:37 -0400 | [diff] [blame] | 816 | static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr, \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | char *buf) \ |
| 818 | { \ |
| 819 | struct scsi_device *sdev; \ |
| 820 | struct zfcp_unit *unit; \ |
| 821 | \ |
| 822 | sdev = to_scsi_device(dev); \ |
| 823 | unit = sdev->hostdata; \ |
| 824 | return sprintf(buf, _format, _value); \ |
| 825 | } \ |
| 826 | \ |
| 827 | static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL); |
| 828 | |
| 829 | ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit)); |
| 830 | ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn); |
| 831 | ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun); |
| 832 | |
| 833 | static struct device_attribute *zfcp_sysfs_sdev_attrs[] = { |
| 834 | &dev_attr_fcp_lun, |
| 835 | &dev_attr_wwpn, |
| 836 | &dev_attr_hba_id, |
| 837 | NULL |
| 838 | }; |
| 839 | |
| 840 | #undef ZFCP_LOG_AREA |