drivers/s390/scsi/zfcp_def.h

   1 /*
   2  * This file is part of the zfcp device driver for
   3  * FCP adapters for IBM System z9 and zSeries.
   4  *
   5  * (C) Copyright IBM Corp. 2002, 2006
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #ifndef ZFCP_DEF_H
  23 #define ZFCP_DEF_H
  24
  25 /*************************** INCLUDES *****************************************/
  26
  27 #include <linux/init.h>
  28 #include <linux/moduleparam.h>
  29 #include <linux/miscdevice.h>
  30 #include <linux/major.h>
  31 #include <linux/blkdev.h>
  32 #include <linux/delay.h>
  33 #include <linux/timer.h>
  34 #include <linux/slab.h>
  35 #include <linux/mempool.h>
  36 #include <linux/syscalls.h>
  37 #include <linux/ioctl.h>
  38 #include <scsi/scsi.h>
  39 #include <scsi/scsi_tcq.h>
  40 #include <scsi/scsi_cmnd.h>
  41 #include <scsi/scsi_device.h>
  42 #include <scsi/scsi_host.h>
  43 #include <scsi/scsi_transport.h>
  44 #include <scsi/scsi_transport_fc.h>
  45 #include <asm/ccwdev.h>
  46 #include <asm/qdio.h>
  47 #include <asm/debug.h>
  48 #include <asm/ebcdic.h>
  49 #include "zfcp_fsf.h"
  50
  51
  52 /********************* GENERAL DEFINES *********************************/
  53
  54 /* zfcp version number, it consists of major, minor, and patch-level number */
  55 #define ZFCP_VERSION            "4.8.0"
  56
  57 /**
  58  * zfcp_sg_to_address - determine kernel address from struct scatterlist
  59  * @list: struct scatterlist
  60  * Return: kernel address
  61  */
  62 static inline void *
  63 zfcp_sg_to_address(struct scatterlist *list)
  64 {
  65         return (void *) (page_address(list->page) + list->offset);
  66 }
  67
  68 /**
  69  * zfcp_address_to_sg - set up struct scatterlist from kernel address
  70  * @address: kernel address
  71  * @list: struct scatterlist
  72  */
  73 static inline void
  74 zfcp_address_to_sg(void *address, struct scatterlist *list)
  75 {
  76         list->page = virt_to_page(address);
  77         list->offset = ((unsigned long) address) & (PAGE_SIZE - 1);
  78 }
  79
  80 #define REQUEST_LIST_SIZE 128
  81
  82 /********************* SCSI SPECIFIC DEFINES *********************************/
  83 #define ZFCP_SCSI_ER_TIMEOUT                    (10*HZ)
  84
  85 /********************* CIO/QDIO SPECIFIC DEFINES *****************************/
  86
  87 /* Adapter Identification Parameters */
  88 #define ZFCP_CONTROL_UNIT_TYPE  0x1731
  89 #define ZFCP_CONTROL_UNIT_MODEL 0x03
  90 #define ZFCP_DEVICE_TYPE        0x1732
  91 #define ZFCP_DEVICE_MODEL       0x03
  92 #define ZFCP_DEVICE_MODEL_PRIV  0x04
  93
  94 /* allow as many chained SBALs as are supported by hardware */
  95 #define ZFCP_MAX_SBALS_PER_REQ          FSF_MAX_SBALS_PER_REQ
  96 #define ZFCP_MAX_SBALS_PER_CT_REQ       FSF_MAX_SBALS_PER_REQ
  97 #define ZFCP_MAX_SBALS_PER_ELS_REQ      FSF_MAX_SBALS_PER_ELS_REQ
  98
  99 /* DMQ bug workaround: don't use last SBALE */
 100 #define ZFCP_MAX_SBALES_PER_SBAL        (QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 101
 102 /* index of last SBALE (with respect to DMQ bug workaround) */
 103 #define ZFCP_LAST_SBALE_PER_SBAL        (ZFCP_MAX_SBALES_PER_SBAL - 1)
 104
 105 /* max. number of (data buffer) SBALEs in largest SBAL chain */
 106 #define ZFCP_MAX_SBALES_PER_REQ         \
 107         (ZFCP_MAX_SBALS_PER_REQ * ZFCP_MAX_SBALES_PER_SBAL - 2)
 108         /* request ID + QTCB in SBALE 0 + 1 of first SBAL in chain */
 109
 110 #define ZFCP_MAX_SECTORS (ZFCP_MAX_SBALES_PER_REQ * 8)
 111         /* max. number of (data buffer) SBALEs in largest SBAL chain
 112            multiplied with number of sectors per 4k block */
 113
 114 /* FIXME(tune): free space should be one max. SBAL chain plus what? */
 115 #define ZFCP_QDIO_PCI_INTERVAL          (QDIO_MAX_BUFFERS_PER_Q \
 116                                          - (ZFCP_MAX_SBALS_PER_REQ + 4))
 117
 118 #define ZFCP_SBAL_TIMEOUT               (5*HZ)
 119
 120 #define ZFCP_TYPE2_RECOVERY_TIME        (8*HZ)
 121
 122 /* queue polling (values in microseconds) */
 123 #define ZFCP_MAX_INPUT_THRESHOLD        5000    /* FIXME: tune */
 124 #define ZFCP_MAX_OUTPUT_THRESHOLD       1000    /* FIXME: tune */
 125 #define ZFCP_MIN_INPUT_THRESHOLD        1       /* ignored by QDIO layer */
 126 #define ZFCP_MIN_OUTPUT_THRESHOLD       1       /* ignored by QDIO layer */
 127
 128 #define QDIO_SCSI_QFMT                  1       /* 1 for FSF */
 129
 130 /********************* FSF SPECIFIC DEFINES *********************************/
 131
 132 #define ZFCP_ULP_INFO_VERSION                   26
 133 #define ZFCP_QTCB_VERSION       FSF_QTCB_CURRENT_VERSION
 134 /* ATTENTION: value must not be used by hardware */
 135 #define FSF_QTCB_UNSOLICITED_STATUS             0x6305
 136 #define ZFCP_STATUS_READ_FAILED_THRESHOLD       3
 137 #define ZFCP_STATUS_READS_RECOM                 FSF_STATUS_READS_RECOM
 138
 139 /* Do 1st retry in 1 second, then double the timeout for each following retry */
 140 #define ZFCP_EXCHANGE_CONFIG_DATA_FIRST_SLEEP   100
 141 #define ZFCP_EXCHANGE_CONFIG_DATA_RETRIES       7
 142
 143 /* timeout value for "default timer" for fsf requests */
 144 #define ZFCP_FSF_REQUEST_TIMEOUT (60*HZ)
 145
 146 /*************** FIBRE CHANNEL PROTOCOL SPECIFIC DEFINES ********************/
 147
 148 typedef unsigned long long wwn_t;
 149 typedef unsigned long long fcp_lun_t;
 150 /* data length field may be at variable position in FCP-2 FCP_CMND IU */
 151 typedef unsigned int       fcp_dl_t;
 152
 153 #define ZFCP_FC_SERVICE_CLASS_DEFAULT   FSF_CLASS_3
 154
 155 /* timeout for name-server lookup (in seconds) */
 156 #define ZFCP_NS_GID_PN_TIMEOUT          10
 157
 158 /* largest SCSI command we can process */
 159 /* FCP-2 (FCP_CMND IU) allows up to (255-3+16) */
 160 #define ZFCP_MAX_SCSI_CMND_LENGTH       255
 161 /* maximum number of commands in LUN queue (tagged queueing) */
 162 #define ZFCP_CMND_PER_LUN               32
 163
 164 /* task attribute values in FCP-2 FCP_CMND IU */
 165 #define SIMPLE_Q        0
 166 #define HEAD_OF_Q       1
 167 #define ORDERED_Q       2
 168 #define ACA_Q           4
 169 #define UNTAGGED        5
 170
 171 /* task management flags in FCP-2 FCP_CMND IU */
 172 #define FCP_CLEAR_ACA           0x40
 173 #define FCP_TARGET_RESET        0x20
 174 #define FCP_LOGICAL_UNIT_RESET  0x10
 175 #define FCP_CLEAR_TASK_SET      0x04
 176 #define FCP_ABORT_TASK_SET      0x02
 177
 178 #define FCP_CDB_LENGTH          16
 179
 180 #define ZFCP_DID_MASK           0x00FFFFFF
 181
 182 /* FCP(-2) FCP_CMND IU */
 183 struct fcp_cmnd_iu {
 184         fcp_lun_t fcp_lun;         /* FCP logical unit number */
 185         u8  crn;                   /* command reference number */
 186         u8  reserved0:5;           /* reserved */
 187         u8  task_attribute:3;      /* task attribute */
 188         u8  task_management_flags; /* task management flags */
 189         u8  add_fcp_cdb_length:6;  /* additional FCP_CDB length */
 190         u8  rddata:1;              /* read data */
 191         u8  wddata:1;              /* write data */
 192         u8  fcp_cdb[FCP_CDB_LENGTH];
 193 } __attribute__((packed));
 194
 195 /* FCP(-2) FCP_RSP IU */
 196 struct fcp_rsp_iu {
 197         u8  reserved0[10];
 198         union {
 199                 struct {
 200                         u8 reserved1:3;
 201                         u8 fcp_conf_req:1;
 202                         u8 fcp_resid_under:1;
 203                         u8 fcp_resid_over:1;
 204                         u8 fcp_sns_len_valid:1;
 205                         u8 fcp_rsp_len_valid:1;
 206                 } bits;
 207                 u8 value;
 208         } validity;
 209         u8  scsi_status;
 210         u32 fcp_resid;
 211         u32 fcp_sns_len;
 212         u32 fcp_rsp_len;
 213 } __attribute__((packed));
 214
 215
 216 #define RSP_CODE_GOOD            0
 217 #define RSP_CODE_LENGTH_MISMATCH 1
 218 #define RSP_CODE_FIELD_INVALID   2
 219 #define RSP_CODE_RO_MISMATCH     3
 220 #define RSP_CODE_TASKMAN_UNSUPP  4
 221 #define RSP_CODE_TASKMAN_FAILED  5
 222
 223 /* see fc-fs */
 224 #define LS_RSCN  0x61040000
 225 #define LS_LOGO  0x05000000
 226 #define LS_PLOGI 0x03000000
 227
 228 struct fcp_rscn_head {
 229         u8  command;
 230         u8  page_length; /* always 0x04 */
 231         u16 payload_len;
 232 } __attribute__((packed));
 233
 234 struct fcp_rscn_element {
 235         u8  reserved:2;
 236         u8  event_qual:4;
 237         u8  addr_format:2;
 238         u32 nport_did:24;
 239 } __attribute__((packed));
 240
 241 #define ZFCP_PORT_ADDRESS   0x0
 242 #define ZFCP_AREA_ADDRESS   0x1
 243 #define ZFCP_DOMAIN_ADDRESS 0x2
 244 #define ZFCP_FABRIC_ADDRESS 0x3
 245
 246 #define ZFCP_PORTS_RANGE_PORT   0xFFFFFF
 247 #define ZFCP_PORTS_RANGE_AREA   0xFFFF00
 248 #define ZFCP_PORTS_RANGE_DOMAIN 0xFF0000
 249 #define ZFCP_PORTS_RANGE_FABRIC 0x000000
 250
 251 #define ZFCP_NO_PORTS_PER_AREA    0x100
 252 #define ZFCP_NO_PORTS_PER_DOMAIN  0x10000
 253 #define ZFCP_NO_PORTS_PER_FABRIC  0x1000000
 254
 255 /* see fc-ph */
 256 struct fcp_logo {
 257         u32 command;
 258         u32 nport_did;
 259         wwn_t nport_wwpn;
 260 } __attribute__((packed));
 261
 262 /*
 263  * DBF stuff
 264  */
 265 #define ZFCP_DBF_TAG_SIZE      4
 266
 267 struct zfcp_dbf_dump {
 268         u8 tag[ZFCP_DBF_TAG_SIZE];
 269         u32 total_size;         /* size of total dump data */
 270         u32 offset;             /* how much data has being already dumped */
 271         u32 size;               /* how much data comes with this record */
 272         u8 data[];              /* dump data */
 273 } __attribute__ ((packed));
 274
 275 /* FIXME: to be inflated when reworking the erp dbf */
 276 struct zfcp_erp_dbf_record {
 277         u8 dummy[16];
 278 } __attribute__ ((packed));
 279
 280 struct zfcp_hba_dbf_record_response {
 281         u32 fsf_command;
 282         u64 fsf_reqid;
 283         u32 fsf_seqno;
 284         u64 fsf_issued;
 285         u32 fsf_prot_status;
 286         u32 fsf_status;
 287         u8 fsf_prot_status_qual[FSF_PROT_STATUS_QUAL_SIZE];
 288         u8 fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
 289         u32 fsf_req_status;
 290         u8 sbal_first;
 291         u8 sbal_curr;
 292         u8 sbal_last;
 293         u8 pool;
 294         u64 erp_action;
 295         union {
 296                 struct {
 297                         u64 scsi_cmnd;
 298                         u64 scsi_serial;
 299                 } send_fcp;
 300                 struct {
 301                         u64 wwpn;
 302                         u32 d_id;
 303                         u32 port_handle;
 304                 } port;
 305                 struct {
 306                         u64 wwpn;
 307                         u64 fcp_lun;
 308                         u32 port_handle;
 309                         u32 lun_handle;
 310                 } unit;
 311                 struct {
 312                         u32 d_id;
 313                         u8 ls_code;
 314                 } send_els;
 315         } data;
 316 } __attribute__ ((packed));
 317
 318 struct zfcp_hba_dbf_record_status {
 319         u8 failed;
 320         u32 status_type;
 321         u32 status_subtype;
 322         struct fsf_queue_designator
 323          queue_designator;
 324         u32 payload_size;
 325 #define ZFCP_DBF_UNSOL_PAYLOAD                          80
 326 #define ZFCP_DBF_UNSOL_PAYLOAD_SENSE_DATA_AVAIL         32
 327 #define ZFCP_DBF_UNSOL_PAYLOAD_BIT_ERROR_THRESHOLD      56
 328 #define ZFCP_DBF_UNSOL_PAYLOAD_FEATURE_UPDATE_ALERT     2 * sizeof(u32)
 329         u8 payload[ZFCP_DBF_UNSOL_PAYLOAD];
 330 } __attribute__ ((packed));
 331
 332 struct zfcp_hba_dbf_record_qdio {
 333         u32 status;
 334         u32 qdio_error;
 335         u32 siga_error;
 336         u8 sbal_index;
 337         u8 sbal_count;
 338 } __attribute__ ((packed));
 339
 340 struct zfcp_hba_dbf_record {
 341         u8 tag[ZFCP_DBF_TAG_SIZE];
 342         u8 tag2[ZFCP_DBF_TAG_SIZE];
 343         union {
 344                 struct zfcp_hba_dbf_record_response response;
 345                 struct zfcp_hba_dbf_record_status status;
 346                 struct zfcp_hba_dbf_record_qdio qdio;
 347         } type;
 348 } __attribute__ ((packed));
 349
 350 struct zfcp_san_dbf_record_ct {
 351         union {
 352                 struct {
 353                         u16 cmd_req_code;
 354                         u8 revision;
 355                         u8 gs_type;
 356                         u8 gs_subtype;
 357                         u8 options;
 358                         u16 max_res_size;
 359                 } request;
 360                 struct {
 361                         u16 cmd_rsp_code;
 362                         u8 revision;
 363                         u8 reason_code;
 364                         u8 reason_code_expl;
 365                         u8 vendor_unique;
 366                 } response;
 367         } type;
 368         u32 payload_size;
 369 #define ZFCP_DBF_CT_PAYLOAD     24
 370         u8 payload[ZFCP_DBF_CT_PAYLOAD];
 371 } __attribute__ ((packed));
 372
 373 struct zfcp_san_dbf_record_els {
 374         u8 ls_code;
 375         u32 payload_size;
 376 #define ZFCP_DBF_ELS_PAYLOAD    32
 377 #define ZFCP_DBF_ELS_MAX_PAYLOAD 1024
 378         u8 payload[ZFCP_DBF_ELS_PAYLOAD];
 379 } __attribute__ ((packed));
 380
 381 struct zfcp_san_dbf_record {
 382         u8 tag[ZFCP_DBF_TAG_SIZE];
 383         u64 fsf_reqid;
 384         u32 fsf_seqno;
 385         u32 s_id;
 386         u32 d_id;
 387         union {
 388                 struct zfcp_san_dbf_record_ct ct;
 389                 struct zfcp_san_dbf_record_els els;
 390         } type;
 391 } __attribute__ ((packed));
 392
 393 struct zfcp_scsi_dbf_record {
 394         u8 tag[ZFCP_DBF_TAG_SIZE];
 395         u8 tag2[ZFCP_DBF_TAG_SIZE];
 396         u32 scsi_id;
 397         u32 scsi_lun;
 398         u32 scsi_result;
 399         u64 scsi_cmnd;
 400         u64 scsi_serial;
 401 #define ZFCP_DBF_SCSI_OPCODE    16
 402         u8 scsi_opcode[ZFCP_DBF_SCSI_OPCODE];
 403         u8 scsi_retries;
 404         u8 scsi_allowed;
 405         u64 fsf_reqid;
 406         u32 fsf_seqno;
 407         u64 fsf_issued;
 408         union {
 409                 u64 old_fsf_reqid;
 410                 struct {
 411                         u8 rsp_validity;
 412                         u8 rsp_scsi_status;
 413                         u32 rsp_resid;
 414                         u8 rsp_code;
 415 #define ZFCP_DBF_SCSI_FCP_SNS_INFO      16
 416 #define ZFCP_DBF_SCSI_MAX_FCP_SNS_INFO  256
 417                         u32 sns_info_len;
 418                         u8 sns_info[ZFCP_DBF_SCSI_FCP_SNS_INFO];
 419                 } fcp;
 420         } type;
 421 } __attribute__ ((packed));
 422
 423 /*
 424  * FC-FS stuff
 425  */
 426 #define R_A_TOV                         10 /* seconds */
 427 #define ZFCP_ELS_TIMEOUT                (2 * R_A_TOV)
 428
 429 #define ZFCP_LS_RLS                     0x0f
 430 #define ZFCP_LS_ADISC                   0x52
 431 #define ZFCP_LS_RPS                     0x56
 432 #define ZFCP_LS_RSCN                    0x61
 433 #define ZFCP_LS_RNID                    0x78
 434
 435 struct zfcp_ls_rjt_par {
 436         u8 action;
 437         u8 reason_code;
 438         u8 reason_expl;
 439         u8 vendor_unique;
 440 } __attribute__ ((packed));
 441
 442 struct zfcp_ls_adisc {
 443         u8              code;
 444         u8              field[3];
 445         u32             hard_nport_id;
 446         u64             wwpn;
 447         u64             wwnn;
 448         u32             nport_id;
 449 } __attribute__ ((packed));
 450
 451 struct zfcp_ls_adisc_acc {
 452         u8              code;
 453         u8              field[3];
 454         u32             hard_nport_id;
 455         u64             wwpn;
 456         u64             wwnn;
 457         u32             nport_id;
 458 } __attribute__ ((packed));
 459
 460 struct zfcp_rc_entry {
 461         u8 code;
 462         const char *description;
 463 };
 464
 465 /*
 466  * FC-GS-2 stuff
 467  */
 468 #define ZFCP_CT_REVISION                0x01
 469 #define ZFCP_CT_DIRECTORY_SERVICE       0xFC
 470 #define ZFCP_CT_NAME_SERVER             0x02
 471 #define ZFCP_CT_SYNCHRONOUS             0x00
 472 #define ZFCP_CT_GID_PN                  0x0121
 473 #define ZFCP_CT_MAX_SIZE                0x1020
 474 #define ZFCP_CT_ACCEPT                  0x8002
 475 #define ZFCP_CT_REJECT                  0x8001
 476
 477 /*
 478  * FC-GS-4 stuff
 479  */
 480 #define ZFCP_CT_TIMEOUT                 (3 * R_A_TOV)
 481
 482 /******************** LOGGING MACROS AND DEFINES *****************************/
 483
 484 /*
 485  * Logging may be applied on certain kinds of driver operations
 486  * independently. Additionally, different log-levels are supported for
 487  * each of these areas.
 488  */
 489
 490 #define ZFCP_NAME               "zfcp"
 491
 492 /* independent log areas */
 493 #define ZFCP_LOG_AREA_OTHER     0
 494 #define ZFCP_LOG_AREA_SCSI      1
 495 #define ZFCP_LOG_AREA_FSF       2
 496 #define ZFCP_LOG_AREA_CONFIG    3
 497 #define ZFCP_LOG_AREA_CIO       4
 498 #define ZFCP_LOG_AREA_QDIO      5
 499 #define ZFCP_LOG_AREA_ERP       6
 500 #define ZFCP_LOG_AREA_FC        7
 501
 502 /* log level values*/
 503 #define ZFCP_LOG_LEVEL_NORMAL   0
 504 #define ZFCP_LOG_LEVEL_INFO     1
 505 #define ZFCP_LOG_LEVEL_DEBUG    2
 506 #define ZFCP_LOG_LEVEL_TRACE    3
 507
 508 /*
 509  * this allows removal of logging code by the preprocessor
 510  * (the most detailed log level still to be compiled in is specified,
 511  * higher log levels are removed)
 512  */
 513 #define ZFCP_LOG_LEVEL_LIMIT    ZFCP_LOG_LEVEL_TRACE
 514
 515 /* get "loglevel" nibble assignment */
 516 #define ZFCP_GET_LOG_VALUE(zfcp_lognibble) \
 517                ((atomic_read(&zfcp_data.loglevel) >> (zfcp_lognibble<<2)) & 0xF)
 518
 519 /* set "loglevel" nibble */
 520 #define ZFCP_SET_LOG_NIBBLE(value, zfcp_lognibble) \
 521                (value << (zfcp_lognibble << 2))
 522
 523 /* all log-level defaults are combined to generate initial log-level */
 524 #define ZFCP_LOG_LEVEL_DEFAULTS \
 525         (ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_OTHER) | \
 526          ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_SCSI) | \
 527          ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_FSF) | \
 528          ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_CONFIG) | \
 529          ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_CIO) | \
 530          ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_QDIO) | \
 531          ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_ERP) | \
 532          ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_FC))
 533
 534 /* check whether we have the right level for logging */
 535 #define ZFCP_LOG_CHECK(level) \
 536         ((ZFCP_GET_LOG_VALUE(ZFCP_LOG_AREA)) >= level)
 537
 538 /* logging routine for zfcp */
 539 #define _ZFCP_LOG(fmt, args...) \
 540         printk(KERN_ERR ZFCP_NAME": %s(%d): " fmt, __FUNCTION__, \
 541                __LINE__ , ##args)
 542
 543 #define ZFCP_LOG(level, fmt, args...) \
 544 do { \
 545         if (ZFCP_LOG_CHECK(level)) \
 546                 _ZFCP_LOG(fmt, ##args); \
 547 } while (0)
 548
 549 #if ZFCP_LOG_LEVEL_LIMIT < ZFCP_LOG_LEVEL_NORMAL
 550 # define ZFCP_LOG_NORMAL(fmt, args...)  do { } while (0)
 551 #else
 552 # define ZFCP_LOG_NORMAL(fmt, args...) \
 553 do { \
 554         if (ZFCP_LOG_CHECK(ZFCP_LOG_LEVEL_NORMAL)) \
 555                 printk(KERN_ERR ZFCP_NAME": " fmt, ##args); \
 556 } while (0)
 557 #endif
 558
 559 #if ZFCP_LOG_LEVEL_LIMIT < ZFCP_LOG_LEVEL_INFO
 560 # define ZFCP_LOG_INFO(fmt, args...)    do { } while (0)
 561 #else
 562 # define ZFCP_LOG_INFO(fmt, args...) \
 563 do { \
 564         if (ZFCP_LOG_CHECK(ZFCP_LOG_LEVEL_INFO)) \
 565                 printk(KERN_ERR ZFCP_NAME": " fmt, ##args); \
 566 } while (0)
 567 #endif
 568
 569 #if ZFCP_LOG_LEVEL_LIMIT < ZFCP_LOG_LEVEL_DEBUG
 570 # define ZFCP_LOG_DEBUG(fmt, args...)   do { } while (0)
 571 #else
 572 # define ZFCP_LOG_DEBUG(fmt, args...) \
 573         ZFCP_LOG(ZFCP_LOG_LEVEL_DEBUG, fmt , ##args)
 574 #endif
 575
 576 #if ZFCP_LOG_LEVEL_LIMIT < ZFCP_LOG_LEVEL_TRACE
 577 # define ZFCP_LOG_TRACE(fmt, args...)   do { } while (0)
 578 #else
 579 # define ZFCP_LOG_TRACE(fmt, args...) \
 580         ZFCP_LOG(ZFCP_LOG_LEVEL_TRACE, fmt , ##args)
 581 #endif
 582
 583 /*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/
 584
 585 /*
 586  * Note, the leftmost status byte is common among adapter, port
 587  * and unit
 588  */
 589 #define ZFCP_COMMON_FLAGS                       0xfff00000
 590
 591 /* common status bits */
 592 #define ZFCP_STATUS_COMMON_REMOVE               0x80000000
 593 #define ZFCP_STATUS_COMMON_RUNNING              0x40000000
 594 #define ZFCP_STATUS_COMMON_ERP_FAILED           0x20000000
 595 #define ZFCP_STATUS_COMMON_UNBLOCKED            0x10000000
 596 #define ZFCP_STATUS_COMMON_OPENING              0x08000000
 597 #define ZFCP_STATUS_COMMON_OPEN                 0x04000000
 598 #define ZFCP_STATUS_COMMON_CLOSING              0x02000000
 599 #define ZFCP_STATUS_COMMON_ERP_INUSE            0x01000000
 600 #define ZFCP_STATUS_COMMON_ACCESS_DENIED        0x00800000
 601 #define ZFCP_STATUS_COMMON_ACCESS_BOXED         0x00400000
 602
 603 /* adapter status */
 604 #define ZFCP_STATUS_ADAPTER_QDIOUP              0x00000002
 605 #define ZFCP_STATUS_ADAPTER_REGISTERED          0x00000004
 606 #define ZFCP_STATUS_ADAPTER_XCONFIG_OK          0x00000008
 607 #define ZFCP_STATUS_ADAPTER_HOST_CON_INIT       0x00000010
 608 #define ZFCP_STATUS_ADAPTER_ERP_THREAD_UP       0x00000020
 609 #define ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL     0x00000080
 610 #define ZFCP_STATUS_ADAPTER_ERP_PENDING         0x00000100
 611 #define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED      0x00000200
 612 #define ZFCP_STATUS_ADAPTER_XPORT_OK            0x00000800
 613
 614 /* FC-PH/FC-GS well-known address identifiers for generic services */
 615 #define ZFCP_DID_MANAGEMENT_SERVICE             0xFFFFFA
 616 #define ZFCP_DID_TIME_SERVICE                   0xFFFFFB
 617 #define ZFCP_DID_DIRECTORY_SERVICE              0xFFFFFC
 618 #define ZFCP_DID_ALIAS_SERVICE                  0xFFFFF8
 619 #define ZFCP_DID_KEY_DISTRIBUTION_SERVICE       0xFFFFF7
 620
 621 /* remote port status */
 622 #define ZFCP_STATUS_PORT_PHYS_OPEN              0x00000001
 623 #define ZFCP_STATUS_PORT_DID_DID                0x00000002
 624 #define ZFCP_STATUS_PORT_PHYS_CLOSING           0x00000004
 625 #define ZFCP_STATUS_PORT_NO_WWPN                0x00000008
 626 #define ZFCP_STATUS_PORT_NO_SCSI_ID             0x00000010
 627 #define ZFCP_STATUS_PORT_INVALID_WWPN           0x00000020
 628
 629 /* for ports with well known addresses */
 630 #define ZFCP_STATUS_PORT_WKA \
 631                 (ZFCP_STATUS_PORT_NO_WWPN | \
 632                  ZFCP_STATUS_PORT_NO_SCSI_ID)
 633
 634 /* logical unit status */
 635 #define ZFCP_STATUS_UNIT_NOTSUPPUNITRESET       0x00000001
 636 #define ZFCP_STATUS_UNIT_TEMPORARY              0x00000002
 637 #define ZFCP_STATUS_UNIT_SHARED                 0x00000004
 638 #define ZFCP_STATUS_UNIT_READONLY               0x00000008
 639 #define ZFCP_STATUS_UNIT_REGISTERED             0x00000010
 640
 641 /* FSF request status (this does not have a common part) */
 642 #define ZFCP_STATUS_FSFREQ_NOT_INIT             0x00000000
 643 #define ZFCP_STATUS_FSFREQ_POOL                 0x00000001
 644 #define ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT      0x00000002
 645 #define ZFCP_STATUS_FSFREQ_COMPLETED            0x00000004
 646 #define ZFCP_STATUS_FSFREQ_ERROR                0x00000008
 647 #define ZFCP_STATUS_FSFREQ_CLEANUP              0x00000010
 648 #define ZFCP_STATUS_FSFREQ_ABORTING             0x00000020
 649 #define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED       0x00000040
 650 #define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED       0x00000080
 651 #define ZFCP_STATUS_FSFREQ_ABORTED              0x00000100
 652 #define ZFCP_STATUS_FSFREQ_TMFUNCFAILED         0x00000200
 653 #define ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP        0x00000400
 654 #define ZFCP_STATUS_FSFREQ_RETRY                0x00000800
 655 #define ZFCP_STATUS_FSFREQ_DISMISSED            0x00001000
 656
 657 /*********************** ERROR RECOVERY PROCEDURE DEFINES ********************/
 658
 659 #define ZFCP_MAX_ERPS                   3
 660
 661 #define ZFCP_ERP_FSFREQ_TIMEOUT         (30 * HZ)
 662 #define ZFCP_ERP_MEMWAIT_TIMEOUT        HZ
 663
 664 #define ZFCP_STATUS_ERP_TIMEDOUT        0x10000000
 665 #define ZFCP_STATUS_ERP_CLOSE_ONLY      0x01000000
 666 #define ZFCP_STATUS_ERP_DISMISSING      0x00100000
 667 #define ZFCP_STATUS_ERP_DISMISSED       0x00200000
 668 #define ZFCP_STATUS_ERP_LOWMEM          0x00400000
 669
 670 #define ZFCP_ERP_STEP_UNINITIALIZED     0x00000000
 671 #define ZFCP_ERP_STEP_FSF_XCONFIG       0x00000001
 672 #define ZFCP_ERP_STEP_PHYS_PORT_CLOSING 0x00000010
 673 #define ZFCP_ERP_STEP_PORT_CLOSING      0x00000100
 674 #define ZFCP_ERP_STEP_NAMESERVER_OPEN   0x00000200
 675 #define ZFCP_ERP_STEP_NAMESERVER_LOOKUP 0x00000400
 676 #define ZFCP_ERP_STEP_PORT_OPENING      0x00000800
 677 #define ZFCP_ERP_STEP_UNIT_CLOSING      0x00001000
 678 #define ZFCP_ERP_STEP_UNIT_OPENING      0x00002000
 679
 680 /* Ordered by escalation level (necessary for proper erp-code operation) */
 681 #define ZFCP_ERP_ACTION_REOPEN_ADAPTER          0x4
 682 #define ZFCP_ERP_ACTION_REOPEN_PORT_FORCED      0x3
 683 #define ZFCP_ERP_ACTION_REOPEN_PORT             0x2
 684 #define ZFCP_ERP_ACTION_REOPEN_UNIT             0x1
 685
 686 #define ZFCP_ERP_ACTION_RUNNING                 0x1
 687 #define ZFCP_ERP_ACTION_READY                   0x2
 688
 689 #define ZFCP_ERP_SUCCEEDED      0x0
 690 #define ZFCP_ERP_FAILED         0x1
 691 #define ZFCP_ERP_CONTINUES      0x2
 692 #define ZFCP_ERP_EXIT           0x3
 693 #define ZFCP_ERP_DISMISSED      0x4
 694 #define ZFCP_ERP_NOMEM          0x5
 695
 696
 697 /******************** CFDC SPECIFIC STUFF *****************************/
 698
 699 /* Firewall data channel sense data record */
 700 struct zfcp_cfdc_sense_data {
 701         u32 signature;           /* Request signature */
 702         u32 devno;               /* FCP adapter device number */
 703         u32 command;             /* Command code */
 704         u32 fsf_status;          /* FSF request status and status qualifier */
 705         u8  fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
 706         u8  payloads[256];       /* Access conflicts list */
 707         u8  control_file[0];     /* Access control table */
 708 };
 709
 710 #define ZFCP_CFDC_SIGNATURE                     0xCFDCACDF
 711
 712 #define ZFCP_CFDC_CMND_DOWNLOAD_NORMAL          0x00010001
 713 #define ZFCP_CFDC_CMND_DOWNLOAD_FORCE           0x00010101
 714 #define ZFCP_CFDC_CMND_FULL_ACCESS              0x00000201
 715 #define ZFCP_CFDC_CMND_RESTRICTED_ACCESS        0x00000401
 716 #define ZFCP_CFDC_CMND_UPLOAD                   0x00010002
 717
 718 #define ZFCP_CFDC_DOWNLOAD                      0x00000001
 719 #define ZFCP_CFDC_UPLOAD                        0x00000002
 720 #define ZFCP_CFDC_WITH_CONTROL_FILE             0x00010000
 721
 722 #define ZFCP_CFDC_DEV_NAME                      "zfcp_cfdc"
 723 #define ZFCP_CFDC_DEV_MAJOR                     MISC_MAJOR
 724 #define ZFCP_CFDC_DEV_MINOR                     MISC_DYNAMIC_MINOR
 725
 726 #define ZFCP_CFDC_MAX_CONTROL_FILE_SIZE         127 * 1024
 727
 728 /************************* STRUCTURE DEFINITIONS *****************************/
 729
 730 struct zfcp_fsf_req;
 731
 732 /* holds various memory pools of an adapter */
 733 struct zfcp_adapter_mempool {
 734         mempool_t *fsf_req_erp;
 735         mempool_t *fsf_req_scsi;
 736         mempool_t *fsf_req_abort;
 737         mempool_t *fsf_req_status_read;
 738         mempool_t *data_status_read;
 739         mempool_t *data_gid_pn;
 740 };
 741
 742 /*
 743  * header for CT_IU
 744  */
 745 struct ct_hdr {
 746         u8 revision;            // 0x01
 747         u8 in_id[3];            // 0x00
 748         u8 gs_type;             // 0xFC Directory Service
 749         u8 gs_subtype;          // 0x02 Name Server
 750         u8 options;             // 0x00 single bidirectional exchange
 751         u8 reserved0;
 752         u16 cmd_rsp_code;       // 0x0121 GID_PN, or 0x0100 GA_NXT
 753         u16 max_res_size;       // <= (4096 - 16) / 4
 754         u8 reserved1;
 755         u8 reason_code;
 756         u8 reason_code_expl;
 757         u8 vendor_unique;
 758 } __attribute__ ((packed));
 759
 760 /* nameserver request CT_IU -- for requests where
 761  * a port name is required */
 762 struct ct_iu_gid_pn_req {
 763         struct ct_hdr header;
 764         wwn_t wwpn;
 765 } __attribute__ ((packed));
 766
 767 /* FS_ACC IU and data unit for GID_PN nameserver request */
 768 struct ct_iu_gid_pn_resp {
 769         struct ct_hdr header;
 770         u32 d_id;
 771 } __attribute__ ((packed));
 772
 773 typedef void (*zfcp_send_ct_handler_t)(unsigned long);
 774
 775 /**
 776  * struct zfcp_send_ct - used to pass parameters to function zfcp_fsf_send_ct
 777  * @port: port where the request is sent to
 778  * @req: scatter-gather list for request
 779  * @resp: scatter-gather list for response
 780  * @req_count: number of elements in request scatter-gather list
 781  * @resp_count: number of elements in response scatter-gather list
 782  * @handler: handler function (called for response to the request)
 783  * @handler_data: data passed to handler function
 784  * @pool: pointer to memory pool for ct request structure
 785  * @timeout: FSF timeout for this request
 786  * @completion: completion for synchronization purposes
 787  * @status: used to pass error status to calling function
 788  */
 789 struct zfcp_send_ct {
 790         struct zfcp_port *port;
 791         struct scatterlist *req;
 792         struct scatterlist *resp;
 793         unsigned int req_count;
 794         unsigned int resp_count;
 795         zfcp_send_ct_handler_t handler;
 796         unsigned long handler_data;
 797         mempool_t *pool;
 798         int timeout;
 799         struct completion *completion;
 800         int status;
 801 };
 802
 803 /* used for name server requests in error recovery */
 804 struct zfcp_gid_pn_data {
 805         struct zfcp_send_ct ct;
 806         struct scatterlist req;
 807         struct scatterlist resp;
 808         struct ct_iu_gid_pn_req ct_iu_req;
 809         struct ct_iu_gid_pn_resp ct_iu_resp;
 810         struct zfcp_port *port;
 811 };
 812
 813 typedef void (*zfcp_send_els_handler_t)(unsigned long);
 814
 815 /**
 816  * struct zfcp_send_els - used to pass parameters to function zfcp_fsf_send_els
 817  * @adapter: adapter where request is sent from
 818  * @port: port where ELS is destinated (port reference count has to be increased)
 819  * @d_id: destiniation id of port where request is sent to
 820  * @req: scatter-gather list for request
 821  * @resp: scatter-gather list for response
 822  * @req_count: number of elements in request scatter-gather list
 823  * @resp_count: number of elements in response scatter-gather list
 824  * @handler: handler function (called for response to the request)
 825  * @handler_data: data passed to handler function
 826  * @completion: completion for synchronization purposes
 827  * @ls_code: hex code of ELS command
 828  * @status: used to pass error status to calling function
 829  */
 830 struct zfcp_send_els {
 831         struct zfcp_adapter *adapter;
 832         struct zfcp_port *port;
 833         u32 d_id;
 834         struct scatterlist *req;
 835         struct scatterlist *resp;
 836         unsigned int req_count;
 837         unsigned int resp_count;
 838         zfcp_send_els_handler_t handler;
 839         unsigned long handler_data;
 840         struct completion *completion;
 841         int ls_code;
 842         int status;
 843 };
 844
 845 struct zfcp_qdio_queue {
 846         struct qdio_buffer *buffer[QDIO_MAX_BUFFERS_PER_Q]; /* SBALs */
 847         u8                 free_index;        /* index of next free bfr
 848                                                  in queue (free_count>0) */
 849         atomic_t           free_count;        /* number of free buffers
 850                                                  in queue */
 851         rwlock_t           queue_lock;        /* lock for operations on queue */
 852         int                distance_from_int; /* SBALs used since PCI indication
 853                                                  was last set */
 854 };
 855
 856 struct zfcp_erp_action {
 857         struct list_head list;
 858         int action;                   /* requested action code */
 859         struct zfcp_adapter *adapter; /* device which should be recovered */
 860         struct zfcp_port *port;
 861         struct zfcp_unit *unit;
 862         volatile u32 status;          /* recovery status */
 863         u32 step;                     /* active step of this erp action */
 864         struct zfcp_fsf_req *fsf_req; /* fsf request currently pending
 865                                          for this action */
 866         struct timer_list timer;
 867 };
 868
 869
 870 struct zfcp_adapter {
 871         struct list_head        list;              /* list of adapters */
 872         atomic_t                refcount;          /* reference count */
 873         wait_queue_head_t       remove_wq;         /* can be used to wait for
 874                                                       refcount drop to zero */
 875         wwn_t                   peer_wwnn;         /* P2P peer WWNN */
 876         wwn_t                   peer_wwpn;         /* P2P peer WWPN */
 877         u32                     peer_d_id;         /* P2P peer D_ID */
 878         struct ccw_device       *ccw_device;       /* S/390 ccw device */
 879         u32                     hydra_version;     /* Hydra version */
 880         u32                     fsf_lic_version;
 881         u32                     adapter_features;  /* FCP channel features */
 882         u32                     connection_features; /* host connection features */
 883         u32                     hardware_version;  /* of FCP channel */
 884         struct Scsi_Host        *scsi_host;        /* Pointer to mid-layer */
 885         struct list_head        port_list_head;    /* remote port list */
 886         struct list_head        port_remove_lh;    /* head of ports to be
 887                                                       removed */
 888         u32                     ports;             /* number of remote ports */
 889         atomic_t                reqs_active;       /* # active FSF reqs */
 890         unsigned long           req_no;            /* unique FSF req number */
 891         struct list_head        *req_list;         /* list of pending reqs */
 892         spinlock_t              req_list_lock;     /* request list lock */
 893         struct zfcp_qdio_queue  request_queue;     /* request queue */
 894         u32                     fsf_req_seq_no;    /* FSF cmnd seq number */
 895         wait_queue_head_t       request_wq;        /* can be used to wait for
 896                                                       more avaliable SBALs */
 897         struct zfcp_qdio_queue  response_queue;    /* response queue */
 898         rwlock_t                abort_lock;        /* Protects against SCSI
 899                                                       stack abort/command
 900                                                       completion races */
 901         u16                     status_read_failed; /* # failed status reads */
 902         atomic_t                status;            /* status of this adapter */
 903         struct list_head        erp_ready_head;    /* error recovery for this
 904                                                       adapter/devices */
 905         struct list_head        erp_running_head;
 906         rwlock_t                erp_lock;
 907         struct semaphore        erp_ready_sem;
 908         wait_queue_head_t       erp_thread_wqh;
 909         wait_queue_head_t       erp_done_wqh;
 910         struct zfcp_erp_action  erp_action;        /* pending error recovery */
 911         atomic_t                erp_counter;
 912         u32                     erp_total_count;   /* total nr of enqueued erp
 913                                                       actions */
 914         u32                     erp_low_mem_count; /* nr of erp actions waiting
 915                                                       for memory */
 916         struct zfcp_port        *nameserver_port;  /* adapter's nameserver */
 917         debug_info_t            *erp_dbf;
 918         debug_info_t            *hba_dbf;
 919         debug_info_t            *san_dbf;          /* debug feature areas */
 920         debug_info_t            *scsi_dbf;
 921         spinlock_t              erp_dbf_lock;
 922         spinlock_t              hba_dbf_lock;
 923         spinlock_t              san_dbf_lock;
 924         spinlock_t              scsi_dbf_lock;
 925         struct zfcp_erp_dbf_record      erp_dbf_buf;
 926         struct zfcp_hba_dbf_record      hba_dbf_buf;
 927         struct zfcp_san_dbf_record      san_dbf_buf;
 928         struct zfcp_scsi_dbf_record     scsi_dbf_buf;
 929         struct zfcp_adapter_mempool     pool;      /* Adapter memory pools */
 930         struct qdio_initialize  qdio_init_data;    /* for qdio_establish */
 931         struct device           generic_services;  /* directory for WKA ports */
 932         struct fc_host_statistics *fc_stats;
 933         struct fsf_qtcb_bottom_port *stats_reset_data;
 934         unsigned long           stats_reset;
 935 };
 936
 937 /*
 938  * the struct device sysfs_device must be at the beginning of this structure.
 939  * pointer to struct device is used to free port structure in release function
 940  * of the device. don't change!
 941  */
 942 struct zfcp_port {
 943         struct device          sysfs_device;   /* sysfs device */
 944         struct fc_rport        *rport;         /* rport of fc transport class */
 945         struct list_head       list;           /* list of remote ports */
 946         atomic_t               refcount;       /* reference count */
 947         wait_queue_head_t      remove_wq;      /* can be used to wait for
 948                                                   refcount drop to zero */
 949         struct zfcp_adapter    *adapter;       /* adapter used to access port */
 950         struct list_head       unit_list_head; /* head of logical unit list */
 951         struct list_head       unit_remove_lh; /* head of luns to be removed
 952                                                   list */
 953         u32                    units;          /* # of logical units in list */
 954         atomic_t               status;         /* status of this remote port */
 955         wwn_t                  wwnn;           /* WWNN if known */
 956         wwn_t                  wwpn;           /* WWPN */
 957         u32                    d_id;           /* D_ID */
 958         u32                    handle;         /* handle assigned by FSF */
 959         struct zfcp_erp_action erp_action;     /* pending error recovery */
 960         atomic_t               erp_counter;
 961         u32                    maxframe_size;
 962         u32                    supported_classes;
 963 };
 964
 965 /* the struct device sysfs_device must be at the beginning of this structure.
 966  * pointer to struct device is used to free unit structure in release function
 967  * of the device. don't change!
 968  */
 969 struct zfcp_unit {
 970         struct device          sysfs_device;   /* sysfs device */
 971         struct list_head       list;           /* list of logical units */
 972         atomic_t               refcount;       /* reference count */
 973         wait_queue_head_t      remove_wq;      /* can be used to wait for
 974                                                   refcount drop to zero */
 975         struct zfcp_port       *port;          /* remote port of unit */
 976         atomic_t               status;         /* status of this logical unit */
 977         unsigned int           scsi_lun;       /* own SCSI LUN */
 978         fcp_lun_t              fcp_lun;        /* own FCP_LUN */
 979         u32                    handle;         /* handle assigned by FSF */
 980         struct scsi_device     *device;        /* scsi device struct pointer */
 981         struct zfcp_erp_action erp_action;     /* pending error recovery */
 982         atomic_t               erp_counter;
 983 };
 984
 985 /* FSF request */
 986 struct zfcp_fsf_req {
 987         struct list_head       list;           /* list of FSF requests */
 988         unsigned long          req_id;         /* unique request ID */
 989         struct zfcp_adapter    *adapter;       /* adapter request belongs to */
 990         u8                     sbal_number;    /* nr of SBALs free for use */
 991         u8                     sbal_first;     /* first SBAL for this request */
 992         u8                     sbal_last;      /* last possible SBAL for
 993                                                   this reuest */
 994         u8                     sbal_curr;      /* current SBAL during creation
 995                                                   of request */
 996         u8                     sbale_curr;     /* current SBALE during creation
 997                                                   of request */
 998         wait_queue_head_t      completion_wq;  /* can be used by a routine
 999                                                   to wait for completion */
1000         volatile u32           status;         /* status of this request */
1001         u32                    fsf_command;    /* FSF Command copy */
1002         struct fsf_qtcb        *qtcb;          /* address of associated QTCB */
1003         u32                    seq_no;         /* Sequence number of request */
1004         unsigned long          data;           /* private data of request */
1005         struct timer_list      timer;          /* used for erp or scsi er */
1006         struct zfcp_erp_action *erp_action;    /* used if this request is
1007                                                   issued on behalf of erp */
1008         mempool_t              *pool;          /* used if request was alloacted
1009                                                   from emergency pool */
1010         unsigned long long     issued;         /* request sent time (STCK) */
1011         struct zfcp_unit       *unit;
1012 };
1013
1014 typedef void zfcp_fsf_req_handler_t(struct zfcp_fsf_req*);
1015
1016 /* driver data */
1017 struct zfcp_data {
1018         struct scsi_host_template scsi_host_template;
1019         struct scsi_transport_template *scsi_transport_template;
1020         atomic_t                status;             /* Module status flags */
1021         struct list_head        adapter_list_head;  /* head of adapter list */
1022         struct list_head        adapter_remove_lh;  /* head of adapters to be
1023                                                        removed */
1024         u32                     adapters;           /* # of adapters in list */
1025         rwlock_t                config_lock;        /* serialises changes
1026                                                        to adapter/port/unit
1027                                                        lists */
1028         struct semaphore        config_sema;        /* serialises configuration
1029                                                        changes */
1030         atomic_t                loglevel;            /* current loglevel */
1031         char                    init_busid[BUS_ID_SIZE];
1032         wwn_t                   init_wwpn;
1033         fcp_lun_t               init_fcp_lun;
1034         char                    *driver_version;
1035         struct kmem_cache               *fsf_req_qtcb_cache;
1036         struct kmem_cache               *sr_buffer_cache;
1037         struct kmem_cache               *gid_pn_cache;
1038 };
1039
1040 /**
1041  * struct zfcp_sg_list - struct describing a scatter-gather list
1042  * @sg: pointer to array of (struct scatterlist)
1043  * @count: number of elements in scatter-gather list
1044  */
1045 struct zfcp_sg_list {
1046         struct scatterlist *sg;
1047         unsigned int count;
1048 };
1049
1050 /* number of elements for various memory pools */
1051 #define ZFCP_POOL_FSF_REQ_ERP_NR        1
1052 #define ZFCP_POOL_FSF_REQ_SCSI_NR       1
1053 #define ZFCP_POOL_FSF_REQ_ABORT_NR      1
1054 #define ZFCP_POOL_STATUS_READ_NR        ZFCP_STATUS_READS_RECOM
1055 #define ZFCP_POOL_DATA_GID_PN_NR        1
1056
1057 /* struct used by memory pools for fsf_requests */
1058 struct zfcp_fsf_req_qtcb {
1059         struct zfcp_fsf_req fsf_req;
1060         struct fsf_qtcb qtcb;
1061 };
1062
1063 /********************** ZFCP SPECIFIC DEFINES ********************************/
1064
1065 #define ZFCP_REQ_AUTO_CLEANUP   0x00000002
1066 #define ZFCP_WAIT_FOR_SBAL      0x00000004
1067 #define ZFCP_REQ_NO_QTCB        0x00000008
1068
1069 #define ZFCP_SET                0x00000100
1070 #define ZFCP_CLEAR              0x00000200
1071
1072 #ifndef atomic_test_mask
1073 #define atomic_test_mask(mask, target) \
1074            ((atomic_read(target) & mask) == mask)
1075 #endif
1076
1077 extern void _zfcp_hex_dump(char *, int);
1078 #define ZFCP_HEX_DUMP(level, addr, count) \
1079                 if (ZFCP_LOG_CHECK(level)) { \
1080                         _zfcp_hex_dump(addr, count); \
1081                 }
1082
1083 #define zfcp_get_busid_by_adapter(adapter) (adapter->ccw_device->dev.bus_id)
1084 #define zfcp_get_busid_by_port(port) (zfcp_get_busid_by_adapter(port->adapter))
1085 #define zfcp_get_busid_by_unit(unit) (zfcp_get_busid_by_port(unit->port))
1086
1087 /*
1088  *  functions needed for reference/usage counting
1089  */
1090
1091 static inline void
1092 zfcp_unit_get(struct zfcp_unit *unit)
1093 {
1094         atomic_inc(&unit->refcount);
1095 }
1096
1097 static inline void
1098 zfcp_unit_put(struct zfcp_unit *unit)
1099 {
1100         if (atomic_dec_return(&unit->refcount) == 0)
1101                 wake_up(&unit->remove_wq);
1102 }
1103
1104 static inline void
1105 zfcp_unit_wait(struct zfcp_unit *unit)
1106 {
1107         wait_event(unit->remove_wq, atomic_read(&unit->refcount) == 0);
1108 }
1109
1110 static inline void
1111 zfcp_port_get(struct zfcp_port *port)
1112 {
1113         atomic_inc(&port->refcount);
1114 }
1115
1116 static inline void
1117 zfcp_port_put(struct zfcp_port *port)
1118 {
1119         if (atomic_dec_return(&port->refcount) == 0)
1120                 wake_up(&port->remove_wq);
1121 }
1122
1123 static inline void
1124 zfcp_port_wait(struct zfcp_port *port)
1125 {
1126         wait_event(port->remove_wq, atomic_read(&port->refcount) == 0);
1127 }
1128
1129 static inline void
1130 zfcp_adapter_get(struct zfcp_adapter *adapter)
1131 {
1132         atomic_inc(&adapter->refcount);
1133 }
1134
1135 static inline void
1136 zfcp_adapter_put(struct zfcp_adapter *adapter)
1137 {
1138         if (atomic_dec_return(&adapter->refcount) == 0)
1139                 wake_up(&adapter->remove_wq);
1140 }
1141
1142 static inline void
1143 zfcp_adapter_wait(struct zfcp_adapter *adapter)
1144 {
1145         wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
1146 }
1147
1148 #endif /* ZFCP_DEF_H */