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   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 #define QBUFF_PER_PAGE                  (PAGE_SIZE / sizeof(struct qdio_buffer))
 130
 131 /********************* FSF SPECIFIC DEFINES *********************************/
 132
 133 #define ZFCP_ULP_INFO_VERSION                   26
 134 #define ZFCP_QTCB_VERSION       FSF_QTCB_CURRENT_VERSION
 135 /* ATTENTION: value must not be used by hardware */
 136 #define FSF_QTCB_UNSOLICITED_STATUS             0x6305
 137 #define ZFCP_STATUS_READ_FAILED_THRESHOLD       3
 138 #define ZFCP_STATUS_READS_RECOM                 FSF_STATUS_READS_RECOM
 139
 140 /* Do 1st retry in 1 second, then double the timeout for each following retry */
 141 #define ZFCP_EXCHANGE_CONFIG_DATA_FIRST_SLEEP   100
 142 #define ZFCP_EXCHANGE_CONFIG_DATA_RETRIES       7
 143
 144 /* timeout value for "default timer" for fsf requests */
 145 #define ZFCP_FSF_REQUEST_TIMEOUT (60*HZ)
 146
 147 /*************** FIBRE CHANNEL PROTOCOL SPECIFIC DEFINES ********************/
 148
 149 typedef unsigned long long wwn_t;
 150 typedef unsigned long long fcp_lun_t;
 151 /* data length field may be at variable position in FCP-2 FCP_CMND IU */
 152 typedef unsigned int       fcp_dl_t;
 153
 154 #define ZFCP_FC_SERVICE_CLASS_DEFAULT   FSF_CLASS_3
 155
 156 /* timeout for name-server lookup (in seconds) */
 157 #define ZFCP_NS_GID_PN_TIMEOUT          10
 158
 159 /* largest SCSI command we can process */
 160 /* FCP-2 (FCP_CMND IU) allows up to (255-3+16) */
 161 #define ZFCP_MAX_SCSI_CMND_LENGTH       255
 162 /* maximum number of commands in LUN queue (tagged queueing) */
 163 #define ZFCP_CMND_PER_LUN               32
 164
 165 /* task attribute values in FCP-2 FCP_CMND IU */
 166 #define SIMPLE_Q        0
 167 #define HEAD_OF_Q       1
 168 #define ORDERED_Q       2
 169 #define ACA_Q           4
 170 #define UNTAGGED        5
 171
 172 /* task management flags in FCP-2 FCP_CMND IU */
 173 #define FCP_CLEAR_ACA           0x40
 174 #define FCP_TARGET_RESET        0x20
 175 #define FCP_LOGICAL_UNIT_RESET  0x10
 176 #define FCP_CLEAR_TASK_SET      0x04
 177 #define FCP_ABORT_TASK_SET      0x02
 178
 179 #define FCP_CDB_LENGTH          16
 180
 181 #define ZFCP_DID_MASK           0x00FFFFFF
 182
 183 /* FCP(-2) FCP_CMND IU */
 184 struct fcp_cmnd_iu {
 185         fcp_lun_t fcp_lun;         /* FCP logical unit number */
 186         u8  crn;                   /* command reference number */
 187         u8  reserved0:5;           /* reserved */
 188         u8  task_attribute:3;      /* task attribute */
 189         u8  task_management_flags; /* task management flags */
 190         u8  add_fcp_cdb_length:6;  /* additional FCP_CDB length */
 191         u8  rddata:1;              /* read data */
 192         u8  wddata:1;              /* write data */
 193         u8  fcp_cdb[FCP_CDB_LENGTH];
 194 } __attribute__((packed));
 195
 196 /* FCP(-2) FCP_RSP IU */
 197 struct fcp_rsp_iu {
 198         u8  reserved0[10];
 199         union {
 200                 struct {
 201                         u8 reserved1:3;
 202                         u8 fcp_conf_req:1;
 203                         u8 fcp_resid_under:1;
 204                         u8 fcp_resid_over:1;
 205                         u8 fcp_sns_len_valid:1;
 206                         u8 fcp_rsp_len_valid:1;
 207                 } bits;
 208                 u8 value;
 209         } validity;
 210         u8  scsi_status;
 211         u32 fcp_resid;
 212         u32 fcp_sns_len;
 213         u32 fcp_rsp_len;
 214 } __attribute__((packed));
 215
 216
 217 #define RSP_CODE_GOOD            0
 218 #define RSP_CODE_LENGTH_MISMATCH 1
 219 #define RSP_CODE_FIELD_INVALID   2
 220 #define RSP_CODE_RO_MISMATCH     3
 221 #define RSP_CODE_TASKMAN_UNSUPP  4
 222 #define RSP_CODE_TASKMAN_FAILED  5
 223
 224 /* see fc-fs */
 225 #define LS_RSCN  0x61040000
 226 #define LS_LOGO  0x05000000
 227 #define LS_PLOGI 0x03000000
 228
 229 struct fcp_rscn_head {
 230         u8  command;
 231         u8  page_length; /* always 0x04 */
 232         u16 payload_len;
 233 } __attribute__((packed));
 234
 235 struct fcp_rscn_element {
 236         u8  reserved:2;
 237         u8  event_qual:4;
 238         u8  addr_format:2;
 239         u32 nport_did:24;
 240 } __attribute__((packed));
 241
 242 #define ZFCP_PORT_ADDRESS   0x0
 243 #define ZFCP_AREA_ADDRESS   0x1
 244 #define ZFCP_DOMAIN_ADDRESS 0x2
 245 #define ZFCP_FABRIC_ADDRESS 0x3
 246
 247 #define ZFCP_PORTS_RANGE_PORT   0xFFFFFF
 248 #define ZFCP_PORTS_RANGE_AREA   0xFFFF00
 249 #define ZFCP_PORTS_RANGE_DOMAIN 0xFF0000
 250 #define ZFCP_PORTS_RANGE_FABRIC 0x000000
 251
 252 #define ZFCP_NO_PORTS_PER_AREA    0x100
 253 #define ZFCP_NO_PORTS_PER_DOMAIN  0x10000
 254 #define ZFCP_NO_PORTS_PER_FABRIC  0x1000000
 255
 256 /* see fc-ph */
 257 struct fcp_logo {
 258         u32 command;
 259         u32 nport_did;
 260         wwn_t nport_wwpn;
 261 } __attribute__((packed));
 262
 263 /*
 264  * DBF stuff
 265  */
 266 #define ZFCP_DBF_TAG_SIZE      4
 267
 268 struct zfcp_dbf_dump {
 269         u8 tag[ZFCP_DBF_TAG_SIZE];
 270         u32 total_size;         /* size of total dump data */
 271         u32 offset;             /* how much data has being already dumped */
 272         u32 size;               /* how much data comes with this record */
 273         u8 data[];              /* dump data */
 274 } __attribute__ ((packed));
 275
 276 /* FIXME: to be inflated when reworking the erp dbf */
 277 struct zfcp_erp_dbf_record {
 278         u8 dummy[16];
 279 } __attribute__ ((packed));
 280
 281 struct zfcp_hba_dbf_record_response {
 282         u32 fsf_command;
 283         u64 fsf_reqid;
 284         u32 fsf_seqno;
 285         u64 fsf_issued;
 286         u32 fsf_prot_status;
 287         u32 fsf_status;
 288         u8 fsf_prot_status_qual[FSF_PROT_STATUS_QUAL_SIZE];
 289         u8 fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
 290         u32 fsf_req_status;
 291         u8 sbal_first;
 292         u8 sbal_curr;
 293         u8 sbal_last;
 294         u8 pool;
 295         u64 erp_action;
 296         union {
 297                 struct {
 298                         u64 scsi_cmnd;
 299                         u64 scsi_serial;
 300                 } send_fcp;
 301                 struct {
 302                         u64 wwpn;
 303                         u32 d_id;
 304                         u32 port_handle;
 305                 } port;
 306                 struct {
 307                         u64 wwpn;
 308                         u64 fcp_lun;
 309                         u32 port_handle;
 310                         u32 lun_handle;
 311                 } unit;
 312                 struct {
 313                         u32 d_id;
 314                         u8 ls_code;
 315                 } send_els;
 316         } data;
 317 } __attribute__ ((packed));
 318
 319 struct zfcp_hba_dbf_record_status {
 320         u8 failed;
 321         u32 status_type;
 322         u32 status_subtype;
 323         struct fsf_queue_designator
 324          queue_designator;
 325         u32 payload_size;
 326 #define ZFCP_DBF_UNSOL_PAYLOAD                          80
 327 #define ZFCP_DBF_UNSOL_PAYLOAD_SENSE_DATA_AVAIL         32
 328 #define ZFCP_DBF_UNSOL_PAYLOAD_BIT_ERROR_THRESHOLD      56
 329 #define ZFCP_DBF_UNSOL_PAYLOAD_FEATURE_UPDATE_ALERT     2 * sizeof(u32)
 330         u8 payload[ZFCP_DBF_UNSOL_PAYLOAD];
 331 } __attribute__ ((packed));
 332
 333 struct zfcp_hba_dbf_record_qdio {
 334         u32 status;
 335         u32 qdio_error;
 336         u32 siga_error;
 337         u8 sbal_index;
 338         u8 sbal_count;
 339 } __attribute__ ((packed));
 340
 341 struct zfcp_hba_dbf_record {
 342         u8 tag[ZFCP_DBF_TAG_SIZE];
 343         u8 tag2[ZFCP_DBF_TAG_SIZE];
 344         union {
 345                 struct zfcp_hba_dbf_record_response response;
 346                 struct zfcp_hba_dbf_record_status status;
 347                 struct zfcp_hba_dbf_record_qdio qdio;
 348         } type;
 349 } __attribute__ ((packed));
 350
 351 struct zfcp_san_dbf_record_ct {
 352         union {
 353                 struct {
 354                         u16 cmd_req_code;
 355                         u8 revision;
 356                         u8 gs_type;
 357                         u8 gs_subtype;
 358                         u8 options;
 359                         u16 max_res_size;
 360                 } request;
 361                 struct {
 362                         u16 cmd_rsp_code;
 363                         u8 revision;
 364                         u8 reason_code;
 365                         u8 reason_code_expl;
 366                         u8 vendor_unique;
 367                 } response;
 368         } type;
 369         u32 payload_size;
 370 #define ZFCP_DBF_CT_PAYLOAD     24
 371         u8 payload[ZFCP_DBF_CT_PAYLOAD];
 372 } __attribute__ ((packed));
 373
 374 struct zfcp_san_dbf_record_els {
 375         u8 ls_code;
 376         u32 payload_size;
 377 #define ZFCP_DBF_ELS_PAYLOAD    32
 378 #define ZFCP_DBF_ELS_MAX_PAYLOAD 1024
 379         u8 payload[ZFCP_DBF_ELS_PAYLOAD];
 380 } __attribute__ ((packed));
 381
 382 struct zfcp_san_dbf_record {
 383         u8 tag[ZFCP_DBF_TAG_SIZE];
 384         u64 fsf_reqid;
 385         u32 fsf_seqno;
 386         u32 s_id;
 387         u32 d_id;
 388         union {
 389                 struct zfcp_san_dbf_record_ct ct;
 390                 struct zfcp_san_dbf_record_els els;
 391         } type;
 392 } __attribute__ ((packed));
 393
 394 struct zfcp_scsi_dbf_record {
 395         u8 tag[ZFCP_DBF_TAG_SIZE];
 396         u8 tag2[ZFCP_DBF_TAG_SIZE];
 397         u32 scsi_id;
 398         u32 scsi_lun;
 399         u32 scsi_result;
 400         u64 scsi_cmnd;
 401         u64 scsi_serial;
 402 #define ZFCP_DBF_SCSI_OPCODE    16
 403         u8 scsi_opcode[ZFCP_DBF_SCSI_OPCODE];
 404         u8 scsi_retries;
 405         u8 scsi_allowed;
 406         u64 fsf_reqid;
 407         u32 fsf_seqno;
 408         u64 fsf_issued;
 409         union {
 410                 u64 old_fsf_reqid;
 411                 struct {
 412                         u8 rsp_validity;
 413                         u8 rsp_scsi_status;
 414                         u32 rsp_resid;
 415                         u8 rsp_code;
 416 #define ZFCP_DBF_SCSI_FCP_SNS_INFO      16
 417 #define ZFCP_DBF_SCSI_MAX_FCP_SNS_INFO  256
 418                         u32 sns_info_len;
 419                         u8 sns_info[ZFCP_DBF_SCSI_FCP_SNS_INFO];
 420                 } fcp;
 421         } type;
 422 } __attribute__ ((packed));
 423
 424 /*
 425  * FC-FS stuff
 426  */
 427 #define R_A_TOV                         10 /* seconds */
 428 #define ZFCP_ELS_TIMEOUT                (2 * R_A_TOV)
 429
 430 #define ZFCP_LS_RLS                     0x0f
 431 #define ZFCP_LS_ADISC                   0x52
 432 #define ZFCP_LS_RPS                     0x56
 433 #define ZFCP_LS_RSCN                    0x61
 434 #define ZFCP_LS_RNID                    0x78
 435
 436 struct zfcp_ls_rjt_par {
 437         u8 action;
 438         u8 reason_code;
 439         u8 reason_expl;
 440         u8 vendor_unique;
 441 } __attribute__ ((packed));
 442
 443 struct zfcp_ls_adisc {
 444         u8              code;
 445         u8              field[3];
 446         u32             hard_nport_id;
 447         u64             wwpn;
 448         u64             wwnn;
 449         u32             nport_id;
 450 } __attribute__ ((packed));
 451
 452 struct zfcp_ls_adisc_acc {
 453         u8              code;
 454         u8              field[3];
 455         u32             hard_nport_id;
 456         u64             wwpn;
 457         u64             wwnn;
 458         u32             nport_id;
 459 } __attribute__ ((packed));
 460
 461 struct zfcp_rc_entry {
 462         u8 code;
 463         const char *description;
 464 };
 465
 466 /*
 467  * FC-GS-2 stuff
 468  */
 469 #define ZFCP_CT_REVISION                0x01
 470 #define ZFCP_CT_DIRECTORY_SERVICE       0xFC
 471 #define ZFCP_CT_NAME_SERVER             0x02
 472 #define ZFCP_CT_SYNCHRONOUS             0x00
 473 #define ZFCP_CT_GID_PN                  0x0121
 474 #define ZFCP_CT_MAX_SIZE                0x1020
 475 #define ZFCP_CT_ACCEPT                  0x8002
 476 #define ZFCP_CT_REJECT                  0x8001
 477
 478 /*
 479  * FC-GS-4 stuff
 480  */
 481 #define ZFCP_CT_TIMEOUT                 (3 * R_A_TOV)
 482
 483 /******************** LOGGING MACROS AND DEFINES *****************************/
 484
 485 /*
 486  * Logging may be applied on certain kinds of driver operations
 487  * independently. Additionally, different log-levels are supported for
 488  * each of these areas.
 489  */
 490
 491 #define ZFCP_NAME               "zfcp"
 492
 493 /* independent log areas */
 494 #define ZFCP_LOG_AREA_OTHER     0
 495 #define ZFCP_LOG_AREA_SCSI      1
 496 #define ZFCP_LOG_AREA_FSF       2
 497 #define ZFCP_LOG_AREA_CONFIG    3
 498 #define ZFCP_LOG_AREA_CIO       4
 499 #define ZFCP_LOG_AREA_QDIO      5
 500 #define ZFCP_LOG_AREA_ERP       6
 501 #define ZFCP_LOG_AREA_FC        7
 502
 503 /* log level values*/
 504 #define ZFCP_LOG_LEVEL_NORMAL   0
 505 #define ZFCP_LOG_LEVEL_INFO     1
 506 #define ZFCP_LOG_LEVEL_DEBUG    2
 507 #define ZFCP_LOG_LEVEL_TRACE    3
 508
 509 /*
 510  * this allows removal of logging code by the preprocessor
 511  * (the most detailed log level still to be compiled in is specified,
 512  * higher log levels are removed)
 513  */
 514 #define ZFCP_LOG_LEVEL_LIMIT    ZFCP_LOG_LEVEL_TRACE
 515
 516 /* get "loglevel" nibble assignment */
 517 #define ZFCP_GET_LOG_VALUE(zfcp_lognibble) \
 518                ((atomic_read(&zfcp_data.loglevel) >> (zfcp_lognibble<<2)) & 0xF)
 519
 520 /* set "loglevel" nibble */
 521 #define ZFCP_SET_LOG_NIBBLE(value, zfcp_lognibble) \
 522                (value << (zfcp_lognibble << 2))
 523
 524 /* all log-level defaults are combined to generate initial log-level */
 525 #define ZFCP_LOG_LEVEL_DEFAULTS \
 526         (ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_OTHER) | \
 527          ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_SCSI) | \
 528          ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_FSF) | \
 529          ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_CONFIG) | \
 530          ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_CIO) | \
 531          ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_QDIO) | \
 532          ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_ERP) | \
 533          ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_FC))
 534
 535 /* check whether we have the right level for logging */
 536 #define ZFCP_LOG_CHECK(level) \
 537         ((ZFCP_GET_LOG_VALUE(ZFCP_LOG_AREA)) >= level)
 538
 539 /* logging routine for zfcp */
 540 #define _ZFCP_LOG(fmt, args...) \
 541         printk(KERN_ERR ZFCP_NAME": %s(%d): " fmt, __FUNCTION__, \
 542                __LINE__ , ##args)
 543
 544 #define ZFCP_LOG(level, fmt, args...) \
 545 do { \
 546         if (ZFCP_LOG_CHECK(level)) \
 547                 _ZFCP_LOG(fmt, ##args); \
 548 } while (0)
 549
 550 #if ZFCP_LOG_LEVEL_LIMIT < ZFCP_LOG_LEVEL_NORMAL
 551 # define ZFCP_LOG_NORMAL(fmt, args...)  do { } while (0)
 552 #else
 553 # define ZFCP_LOG_NORMAL(fmt, args...) \
 554 do { \
 555         if (ZFCP_LOG_CHECK(ZFCP_LOG_LEVEL_NORMAL)) \
 556                 printk(KERN_ERR ZFCP_NAME": " fmt, ##args); \
 557 } while (0)
 558 #endif
 559
 560 #if ZFCP_LOG_LEVEL_LIMIT < ZFCP_LOG_LEVEL_INFO
 561 # define ZFCP_LOG_INFO(fmt, args...)    do { } while (0)
 562 #else
 563 # define ZFCP_LOG_INFO(fmt, args...) \
 564 do { \
 565         if (ZFCP_LOG_CHECK(ZFCP_LOG_LEVEL_INFO)) \
 566                 printk(KERN_ERR ZFCP_NAME": " fmt, ##args); \
 567 } while (0)
 568 #endif
 569
 570 #if ZFCP_LOG_LEVEL_LIMIT < ZFCP_LOG_LEVEL_DEBUG
 571 # define ZFCP_LOG_DEBUG(fmt, args...)   do { } while (0)
 572 #else
 573 # define ZFCP_LOG_DEBUG(fmt, args...) \
 574         ZFCP_LOG(ZFCP_LOG_LEVEL_DEBUG, fmt , ##args)
 575 #endif
 576
 577 #if ZFCP_LOG_LEVEL_LIMIT < ZFCP_LOG_LEVEL_TRACE
 578 # define ZFCP_LOG_TRACE(fmt, args...)   do { } while (0)
 579 #else
 580 # define ZFCP_LOG_TRACE(fmt, args...) \
 581         ZFCP_LOG(ZFCP_LOG_LEVEL_TRACE, fmt , ##args)
 582 #endif
 583
 584 /*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/
 585
 586 /*
 587  * Note, the leftmost status byte is common among adapter, port
 588  * and unit
 589  */
 590 #define ZFCP_COMMON_FLAGS                       0xfff00000
 591
 592 /* common status bits */
 593 #define ZFCP_STATUS_COMMON_REMOVE               0x80000000
 594 #define ZFCP_STATUS_COMMON_RUNNING              0x40000000
 595 #define ZFCP_STATUS_COMMON_ERP_FAILED           0x20000000
 596 #define ZFCP_STATUS_COMMON_UNBLOCKED            0x10000000
 597 #define ZFCP_STATUS_COMMON_OPENING              0x08000000
 598 #define ZFCP_STATUS_COMMON_OPEN                 0x04000000
 599 #define ZFCP_STATUS_COMMON_CLOSING              0x02000000
 600 #define ZFCP_STATUS_COMMON_ERP_INUSE            0x01000000
 601 #define ZFCP_STATUS_COMMON_ACCESS_DENIED        0x00800000
 602 #define ZFCP_STATUS_COMMON_ACCESS_BOXED         0x00400000
 603
 604 /* adapter status */
 605 #define ZFCP_STATUS_ADAPTER_QDIOUP              0x00000002
 606 #define ZFCP_STATUS_ADAPTER_REGISTERED          0x00000004
 607 #define ZFCP_STATUS_ADAPTER_XCONFIG_OK          0x00000008
 608 #define ZFCP_STATUS_ADAPTER_HOST_CON_INIT       0x00000010
 609 #define ZFCP_STATUS_ADAPTER_ERP_THREAD_UP       0x00000020
 610 #define ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL     0x00000080
 611 #define ZFCP_STATUS_ADAPTER_ERP_PENDING         0x00000100
 612 #define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED      0x00000200
 613 #define ZFCP_STATUS_ADAPTER_XPORT_OK            0x00000800
 614
 615 /* FC-PH/FC-GS well-known address identifiers for generic services */
 616 #define ZFCP_DID_MANAGEMENT_SERVICE             0xFFFFFA
 617 #define ZFCP_DID_TIME_SERVICE                   0xFFFFFB
 618 #define ZFCP_DID_DIRECTORY_SERVICE              0xFFFFFC
 619 #define ZFCP_DID_ALIAS_SERVICE                  0xFFFFF8
 620 #define ZFCP_DID_KEY_DISTRIBUTION_SERVICE       0xFFFFF7
 621
 622 /* remote port status */
 623 #define ZFCP_STATUS_PORT_PHYS_OPEN              0x00000001
 624 #define ZFCP_STATUS_PORT_DID_DID                0x00000002
 625 #define ZFCP_STATUS_PORT_PHYS_CLOSING           0x00000004
 626 #define ZFCP_STATUS_PORT_NO_WWPN                0x00000008
 627 #define ZFCP_STATUS_PORT_NO_SCSI_ID             0x00000010
 628 #define ZFCP_STATUS_PORT_INVALID_WWPN           0x00000020
 629
 630 /* for ports with well known addresses */
 631 #define ZFCP_STATUS_PORT_WKA \
 632                 (ZFCP_STATUS_PORT_NO_WWPN | \
 633                  ZFCP_STATUS_PORT_NO_SCSI_ID)
 634
 635 /* logical unit status */
 636 #define ZFCP_STATUS_UNIT_NOTSUPPUNITRESET       0x00000001
 637 #define ZFCP_STATUS_UNIT_TEMPORARY              0x00000002
 638 #define ZFCP_STATUS_UNIT_SHARED                 0x00000004
 639 #define ZFCP_STATUS_UNIT_READONLY               0x00000008
 640 #define ZFCP_STATUS_UNIT_REGISTERED             0x00000010
 641 #define ZFCP_STATUS_UNIT_SCSI_WORK_PENDING      0x00000020
 642
 643 /* FSF request status (this does not have a common part) */
 644 #define ZFCP_STATUS_FSFREQ_NOT_INIT             0x00000000
 645 #define ZFCP_STATUS_FSFREQ_POOL                 0x00000001
 646 #define ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT      0x00000002
 647 #define ZFCP_STATUS_FSFREQ_COMPLETED            0x00000004
 648 #define ZFCP_STATUS_FSFREQ_ERROR                0x00000008
 649 #define ZFCP_STATUS_FSFREQ_CLEANUP              0x00000010
 650 #define ZFCP_STATUS_FSFREQ_ABORTING             0x00000020
 651 #define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED       0x00000040
 652 #define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED       0x00000080
 653 #define ZFCP_STATUS_FSFREQ_ABORTED              0x00000100
 654 #define ZFCP_STATUS_FSFREQ_TMFUNCFAILED         0x00000200
 655 #define ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP        0x00000400
 656 #define ZFCP_STATUS_FSFREQ_RETRY                0x00000800
 657 #define ZFCP_STATUS_FSFREQ_DISMISSED            0x00001000
 658
 659 /*********************** ERROR RECOVERY PROCEDURE DEFINES ********************/
 660
 661 #define ZFCP_MAX_ERPS                   3
 662
 663 #define ZFCP_ERP_FSFREQ_TIMEOUT         (30 * HZ)
 664 #define ZFCP_ERP_MEMWAIT_TIMEOUT        HZ
 665
 666 #define ZFCP_STATUS_ERP_TIMEDOUT        0x10000000
 667 #define ZFCP_STATUS_ERP_CLOSE_ONLY      0x01000000
 668 #define ZFCP_STATUS_ERP_DISMISSING      0x00100000
 669 #define ZFCP_STATUS_ERP_DISMISSED       0x00200000
 670 #define ZFCP_STATUS_ERP_LOWMEM          0x00400000
 671
 672 #define ZFCP_ERP_STEP_UNINITIALIZED     0x00000000
 673 #define ZFCP_ERP_STEP_FSF_XCONFIG       0x00000001
 674 #define ZFCP_ERP_STEP_PHYS_PORT_CLOSING 0x00000010
 675 #define ZFCP_ERP_STEP_PORT_CLOSING      0x00000100
 676 #define ZFCP_ERP_STEP_NAMESERVER_OPEN   0x00000200
 677 #define ZFCP_ERP_STEP_NAMESERVER_LOOKUP 0x00000400
 678 #define ZFCP_ERP_STEP_PORT_OPENING      0x00000800
 679 #define ZFCP_ERP_STEP_UNIT_CLOSING      0x00001000
 680 #define ZFCP_ERP_STEP_UNIT_OPENING      0x00002000
 681
 682 /* Ordered by escalation level (necessary for proper erp-code operation) */
 683 #define ZFCP_ERP_ACTION_REOPEN_ADAPTER          0x4
 684 #define ZFCP_ERP_ACTION_REOPEN_PORT_FORCED      0x3
 685 #define ZFCP_ERP_ACTION_REOPEN_PORT             0x2
 686 #define ZFCP_ERP_ACTION_REOPEN_UNIT             0x1
 687
 688 #define ZFCP_ERP_ACTION_RUNNING                 0x1
 689 #define ZFCP_ERP_ACTION_READY                   0x2
 690
 691 #define ZFCP_ERP_SUCCEEDED      0x0
 692 #define ZFCP_ERP_FAILED         0x1
 693 #define ZFCP_ERP_CONTINUES      0x2
 694 #define ZFCP_ERP_EXIT           0x3
 695 #define ZFCP_ERP_DISMISSED      0x4
 696 #define ZFCP_ERP_NOMEM          0x5
 697
 698
 699 /******************** CFDC SPECIFIC STUFF *****************************/
 700
 701 /* Firewall data channel sense data record */
 702 struct zfcp_cfdc_sense_data {
 703         u32 signature;           /* Request signature */
 704         u32 devno;               /* FCP adapter device number */
 705         u32 command;             /* Command code */
 706         u32 fsf_status;          /* FSF request status and status qualifier */
 707         u8  fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
 708         u8  payloads[256];       /* Access conflicts list */
 709         u8  control_file[0];     /* Access control table */
 710 };
 711
 712 #define ZFCP_CFDC_SIGNATURE                     0xCFDCACDF
 713
 714 #define ZFCP_CFDC_CMND_DOWNLOAD_NORMAL          0x00010001
 715 #define ZFCP_CFDC_CMND_DOWNLOAD_FORCE           0x00010101
 716 #define ZFCP_CFDC_CMND_FULL_ACCESS              0x00000201
 717 #define ZFCP_CFDC_CMND_RESTRICTED_ACCESS        0x00000401
 718 #define ZFCP_CFDC_CMND_UPLOAD                   0x00010002
 719
 720 #define ZFCP_CFDC_DOWNLOAD                      0x00000001
 721 #define ZFCP_CFDC_UPLOAD                        0x00000002
 722 #define ZFCP_CFDC_WITH_CONTROL_FILE             0x00010000
 723
 724 #define ZFCP_CFDC_DEV_NAME                      "zfcp_cfdc"
 725 #define ZFCP_CFDC_DEV_MAJOR                     MISC_MAJOR
 726 #define ZFCP_CFDC_DEV_MINOR                     MISC_DYNAMIC_MINOR
 727
 728 #define ZFCP_CFDC_MAX_CONTROL_FILE_SIZE         127 * 1024
 729
 730 /************************* STRUCTURE DEFINITIONS *****************************/
 731
 732 struct zfcp_fsf_req;
 733
 734 /* holds various memory pools of an adapter */
 735 struct zfcp_adapter_mempool {
 736         mempool_t *fsf_req_erp;
 737         mempool_t *fsf_req_scsi;
 738         mempool_t *fsf_req_abort;
 739         mempool_t *fsf_req_status_read;
 740         mempool_t *data_status_read;
 741         mempool_t *data_gid_pn;
 742 };
 743
 744 /*
 745  * header for CT_IU
 746  */
 747 struct ct_hdr {
 748         u8 revision;            // 0x01
 749         u8 in_id[3];            // 0x00
 750         u8 gs_type;             // 0xFC Directory Service
 751         u8 gs_subtype;          // 0x02 Name Server
 752         u8 options;             // 0x00 single bidirectional exchange
 753         u8 reserved0;
 754         u16 cmd_rsp_code;       // 0x0121 GID_PN, or 0x0100 GA_NXT
 755         u16 max_res_size;       // <= (4096 - 16) / 4
 756         u8 reserved1;
 757         u8 reason_code;
 758         u8 reason_code_expl;
 759         u8 vendor_unique;
 760 } __attribute__ ((packed));
 761
 762 /* nameserver request CT_IU -- for requests where
 763  * a port name is required */
 764 struct ct_iu_gid_pn_req {
 765         struct ct_hdr header;
 766         wwn_t wwpn;
 767 } __attribute__ ((packed));
 768
 769 /* FS_ACC IU and data unit for GID_PN nameserver request */
 770 struct ct_iu_gid_pn_resp {
 771         struct ct_hdr header;
 772         u32 d_id;
 773 } __attribute__ ((packed));
 774
 775 typedef void (*zfcp_send_ct_handler_t)(unsigned long);
 776
 777 /**
 778  * struct zfcp_send_ct - used to pass parameters to function zfcp_fsf_send_ct
 779  * @port: port where the request is sent to
 780  * @req: scatter-gather list for request
 781  * @resp: scatter-gather list for response
 782  * @req_count: number of elements in request scatter-gather list
 783  * @resp_count: number of elements in response scatter-gather list
 784  * @handler: handler function (called for response to the request)
 785  * @handler_data: data passed to handler function
 786  * @pool: pointer to memory pool for ct request structure
 787  * @timeout: FSF timeout for this request
 788  * @completion: completion for synchronization purposes
 789  * @status: used to pass error status to calling function
 790  */
 791 struct zfcp_send_ct {
 792         struct zfcp_port *port;
 793         struct scatterlist *req;
 794         struct scatterlist *resp;
 795         unsigned int req_count;
 796         unsigned int resp_count;
 797         zfcp_send_ct_handler_t handler;
 798         unsigned long handler_data;
 799         mempool_t *pool;
 800         int timeout;
 801         struct completion *completion;
 802         int status;
 803 };
 804
 805 /* used for name server requests in error recovery */
 806 struct zfcp_gid_pn_data {
 807         struct zfcp_send_ct ct;
 808         struct scatterlist req;
 809         struct scatterlist resp;
 810         struct ct_iu_gid_pn_req ct_iu_req;
 811         struct ct_iu_gid_pn_resp ct_iu_resp;
 812         struct zfcp_port *port;
 813 };
 814
 815 typedef void (*zfcp_send_els_handler_t)(unsigned long);
 816
 817 /**
 818  * struct zfcp_send_els - used to pass parameters to function zfcp_fsf_send_els
 819  * @adapter: adapter where request is sent from
 820  * @port: port where ELS is destinated (port reference count has to be increased)
 821  * @d_id: destiniation id of port where request is sent to
 822  * @req: scatter-gather list for request
 823  * @resp: scatter-gather list for response
 824  * @req_count: number of elements in request scatter-gather list
 825  * @resp_count: number of elements in response scatter-gather list
 826  * @handler: handler function (called for response to the request)
 827  * @handler_data: data passed to handler function
 828  * @completion: completion for synchronization purposes
 829  * @ls_code: hex code of ELS command
 830  * @status: used to pass error status to calling function
 831  */
 832 struct zfcp_send_els {
 833         struct zfcp_adapter *adapter;
 834         struct zfcp_port *port;
 835         u32 d_id;
 836         struct scatterlist *req;
 837         struct scatterlist *resp;
 838         unsigned int req_count;
 839         unsigned int resp_count;
 840         zfcp_send_els_handler_t handler;
 841         unsigned long handler_data;
 842         struct completion *completion;
 843         int ls_code;
 844         int status;
 845 };
 846
 847 struct zfcp_qdio_queue {
 848         struct qdio_buffer *buffer[QDIO_MAX_BUFFERS_PER_Q]; /* SBALs */
 849         u8                 free_index;        /* index of next free bfr
 850                                                  in queue (free_count>0) */
 851         atomic_t           free_count;        /* number of free buffers
 852                                                  in queue */
 853         rwlock_t           queue_lock;        /* lock for operations on queue */
 854         int                distance_from_int; /* SBALs used since PCI indication
 855                                                  was last set */
 856 };
 857
 858 struct zfcp_erp_action {
 859         struct list_head list;
 860         int action;                   /* requested action code */
 861         struct zfcp_adapter *adapter; /* device which should be recovered */
 862         struct zfcp_port *port;
 863         struct zfcp_unit *unit;
 864         volatile u32 status;          /* recovery status */
 865         u32 step;                     /* active step of this erp action */
 866         struct zfcp_fsf_req *fsf_req; /* fsf request currently pending
 867                                          for this action */
 868         struct timer_list timer;
 869 };
 870
 871
 872 struct zfcp_adapter {
 873         struct list_head        list;              /* list of adapters */
 874         atomic_t                refcount;          /* reference count */
 875         wait_queue_head_t       remove_wq;         /* can be used to wait for
 876                                                       refcount drop to zero */
 877         wwn_t                   peer_wwnn;         /* P2P peer WWNN */
 878         wwn_t                   peer_wwpn;         /* P2P peer WWPN */
 879         u32                     peer_d_id;         /* P2P peer D_ID */
 880         struct ccw_device       *ccw_device;       /* S/390 ccw device */
 881         u32                     hydra_version;     /* Hydra version */
 882         u32                     fsf_lic_version;
 883         u32                     adapter_features;  /* FCP channel features */
 884         u32                     connection_features; /* host connection features */
 885         u32                     hardware_version;  /* of FCP channel */
 886         struct Scsi_Host        *scsi_host;        /* Pointer to mid-layer */
 887         struct list_head        port_list_head;    /* remote port list */
 888         struct list_head        port_remove_lh;    /* head of ports to be
 889                                                       removed */
 890         u32                     ports;             /* number of remote ports */
 891         atomic_t                reqs_active;       /* # active FSF reqs */
 892         unsigned long           req_no;            /* unique FSF req number */
 893         struct list_head        *req_list;         /* list of pending reqs */
 894         spinlock_t              req_list_lock;     /* request list lock */
 895         struct zfcp_qdio_queue  request_queue;     /* request queue */
 896         u32                     fsf_req_seq_no;    /* FSF cmnd seq number */
 897         wait_queue_head_t       request_wq;        /* can be used to wait for
 898                                                       more avaliable SBALs */
 899         struct zfcp_qdio_queue  response_queue;    /* response queue */
 900         rwlock_t                abort_lock;        /* Protects against SCSI
 901                                                       stack abort/command
 902                                                       completion races */
 903         u16                     status_read_failed; /* # failed status reads */
 904         atomic_t                status;            /* status of this adapter */
 905         struct list_head        erp_ready_head;    /* error recovery for this
 906                                                       adapter/devices */
 907         struct list_head        erp_running_head;
 908         rwlock_t                erp_lock;
 909         struct semaphore        erp_ready_sem;
 910         wait_queue_head_t       erp_thread_wqh;
 911         wait_queue_head_t       erp_done_wqh;
 912         struct zfcp_erp_action  erp_action;        /* pending error recovery */
 913         atomic_t                erp_counter;
 914         u32                     erp_total_count;   /* total nr of enqueued erp
 915                                                       actions */
 916         u32                     erp_low_mem_count; /* nr of erp actions waiting
 917                                                       for memory */
 918         struct zfcp_port        *nameserver_port;  /* adapter's nameserver */
 919         debug_info_t            *erp_dbf;
 920         debug_info_t            *hba_dbf;
 921         debug_info_t            *san_dbf;          /* debug feature areas */
 922         debug_info_t            *scsi_dbf;
 923         spinlock_t              erp_dbf_lock;
 924         spinlock_t              hba_dbf_lock;
 925         spinlock_t              san_dbf_lock;
 926         spinlock_t              scsi_dbf_lock;
 927         struct zfcp_erp_dbf_record      erp_dbf_buf;
 928         struct zfcp_hba_dbf_record      hba_dbf_buf;
 929         struct zfcp_san_dbf_record      san_dbf_buf;
 930         struct zfcp_scsi_dbf_record     scsi_dbf_buf;
 931         struct zfcp_adapter_mempool     pool;      /* Adapter memory pools */
 932         struct qdio_initialize  qdio_init_data;    /* for qdio_establish */
 933         struct device           generic_services;  /* directory for WKA ports */
 934         struct fc_host_statistics *fc_stats;
 935         struct fsf_qtcb_bottom_port *stats_reset_data;
 936         unsigned long           stats_reset;
 937 };
 938
 939 /*
 940  * the struct device sysfs_device must be at the beginning of this structure.
 941  * pointer to struct device is used to free port structure in release function
 942  * of the device. don't change!
 943  */
 944 struct zfcp_port {
 945         struct device          sysfs_device;   /* sysfs device */
 946         struct fc_rport        *rport;         /* rport of fc transport class */
 947         struct list_head       list;           /* list of remote ports */
 948         atomic_t               refcount;       /* reference count */
 949         wait_queue_head_t      remove_wq;      /* can be used to wait for
 950                                                   refcount drop to zero */
 951         struct zfcp_adapter    *adapter;       /* adapter used to access port */
 952         struct list_head       unit_list_head; /* head of logical unit list */
 953         struct list_head       unit_remove_lh; /* head of luns to be removed
 954                                                   list */
 955         u32                    units;          /* # of logical units in list */
 956         atomic_t               status;         /* status of this remote port */
 957         wwn_t                  wwnn;           /* WWNN if known */
 958         wwn_t                  wwpn;           /* WWPN */
 959         u32                    d_id;           /* D_ID */
 960         u32                    handle;         /* handle assigned by FSF */
 961         struct zfcp_erp_action erp_action;     /* pending error recovery */
 962         atomic_t               erp_counter;
 963         u32                    maxframe_size;
 964         u32                    supported_classes;
 965 };
 966
 967 /* the struct device sysfs_device must be at the beginning of this structure.
 968  * pointer to struct device is used to free unit structure in release function
 969  * of the device. don't change!
 970  */
 971 struct zfcp_unit {
 972         struct device          sysfs_device;   /* sysfs device */
 973         struct list_head       list;           /* list of logical units */
 974         atomic_t               refcount;       /* reference count */
 975         wait_queue_head_t      remove_wq;      /* can be used to wait for
 976                                                   refcount drop to zero */
 977         struct zfcp_port       *port;          /* remote port of unit */
 978         atomic_t               status;         /* status of this logical unit */
 979         unsigned int           scsi_lun;       /* own SCSI LUN */
 980         fcp_lun_t              fcp_lun;        /* own FCP_LUN */
 981         u32                    handle;         /* handle assigned by FSF */
 982         struct scsi_device     *device;        /* scsi device struct pointer */
 983         struct zfcp_erp_action erp_action;     /* pending error recovery */
 984         atomic_t               erp_counter;
 985         wait_queue_head_t      scsi_scan_wq;   /* can be used to wait until
 986                                                   all scsi_scan_target
 987                                                   requests have been
 988                                                   completed. */
 989 };
 990
 991 /* FSF request */
 992 struct zfcp_fsf_req {
 993         struct list_head       list;           /* list of FSF requests */
 994         unsigned long          req_id;         /* unique request ID */
 995         struct zfcp_adapter    *adapter;       /* adapter request belongs to */
 996         u8                     sbal_number;    /* nr of SBALs free for use */
 997         u8                     sbal_first;     /* first SBAL for this request */
 998         u8                     sbal_last;      /* last possible SBAL for
 999                                                   this reuest */
1000         u8                     sbal_curr;      /* current SBAL during creation
1001                                                   of request */
1002         u8                     sbale_curr;     /* current SBALE during creation
1003                                                   of request */
1004         wait_queue_head_t      completion_wq;  /* can be used by a routine
1005                                                   to wait for completion */
1006         volatile u32           status;         /* status of this request */
1007         u32                    fsf_command;    /* FSF Command copy */
1008         struct fsf_qtcb        *qtcb;          /* address of associated QTCB */
1009         u32                    seq_no;         /* Sequence number of request */
1010         unsigned long          data;           /* private data of request */
1011         struct timer_list      timer;          /* used for erp or scsi er */
1012         struct zfcp_erp_action *erp_action;    /* used if this request is
1013                                                   issued on behalf of erp */
1014         mempool_t              *pool;          /* used if request was alloacted
1015                                                   from emergency pool */
1016         unsigned long long     issued;         /* request sent time (STCK) */
1017         struct zfcp_unit       *unit;
1018 };
1019
1020 typedef void zfcp_fsf_req_handler_t(struct zfcp_fsf_req*);
1021
1022 /* driver data */
1023 struct zfcp_data {
1024         struct scsi_host_template scsi_host_template;
1025         struct scsi_transport_template *scsi_transport_template;
1026         atomic_t                status;             /* Module status flags */
1027         struct list_head        adapter_list_head;  /* head of adapter list */
1028         struct list_head        adapter_remove_lh;  /* head of adapters to be
1029                                                        removed */
1030         u32                     adapters;           /* # of adapters in list */
1031         rwlock_t                config_lock;        /* serialises changes
1032                                                        to adapter/port/unit
1033                                                        lists */
1034         struct semaphore        config_sema;        /* serialises configuration
1035                                                        changes */
1036         atomic_t                loglevel;            /* current loglevel */
1037         char                    init_busid[BUS_ID_SIZE];
1038         wwn_t                   init_wwpn;
1039         fcp_lun_t               init_fcp_lun;
1040         char                    *driver_version;
1041         struct kmem_cache               *fsf_req_qtcb_cache;
1042         struct kmem_cache               *sr_buffer_cache;
1043         struct kmem_cache               *gid_pn_cache;
1044 };
1045
1046 /**
1047  * struct zfcp_sg_list - struct describing a scatter-gather list
1048  * @sg: pointer to array of (struct scatterlist)
1049  * @count: number of elements in scatter-gather list
1050  */
1051 struct zfcp_sg_list {
1052         struct scatterlist *sg;
1053         unsigned int count;
1054 };
1055
1056 /* number of elements for various memory pools */
1057 #define ZFCP_POOL_FSF_REQ_ERP_NR        1
1058 #define ZFCP_POOL_FSF_REQ_SCSI_NR       1
1059 #define ZFCP_POOL_FSF_REQ_ABORT_NR      1
1060 #define ZFCP_POOL_STATUS_READ_NR        ZFCP_STATUS_READS_RECOM
1061 #define ZFCP_POOL_DATA_GID_PN_NR        1
1062
1063 /* struct used by memory pools for fsf_requests */
1064 struct zfcp_fsf_req_qtcb {
1065         struct zfcp_fsf_req fsf_req;
1066         struct fsf_qtcb qtcb;
1067 };
1068
1069 /********************** ZFCP SPECIFIC DEFINES ********************************/
1070
1071 #define ZFCP_REQ_AUTO_CLEANUP   0x00000002
1072 #define ZFCP_WAIT_FOR_SBAL      0x00000004
1073 #define ZFCP_REQ_NO_QTCB        0x00000008
1074
1075 #define ZFCP_SET                0x00000100
1076 #define ZFCP_CLEAR              0x00000200
1077
1078 #ifndef atomic_test_mask
1079 #define atomic_test_mask(mask, target) \
1080            ((atomic_read(target) & mask) == mask)
1081 #endif
1082
1083 extern void _zfcp_hex_dump(char *, int);
1084 #define ZFCP_HEX_DUMP(level, addr, count) \
1085                 if (ZFCP_LOG_CHECK(level)) { \
1086                         _zfcp_hex_dump(addr, count); \
1087                 }
1088
1089 #define zfcp_get_busid_by_adapter(adapter) (adapter->ccw_device->dev.bus_id)
1090 #define zfcp_get_busid_by_port(port) (zfcp_get_busid_by_adapter(port->adapter))
1091 #define zfcp_get_busid_by_unit(unit) (zfcp_get_busid_by_port(unit->port))
1092
1093 /*
1094  * Helper functions for request ID management.
1095  */
1096 static inline int zfcp_reqlist_hash(unsigned long req_id)
1097 {
1098         return req_id % REQUEST_LIST_SIZE;
1099 }
1100
1101 static inline void zfcp_reqlist_add(struct zfcp_adapter *adapter,
1102                                     struct zfcp_fsf_req *fsf_req)
1103 {
1104         unsigned int idx;
1105
1106         idx = zfcp_reqlist_hash(fsf_req->req_id);
1107         list_add_tail(&fsf_req->list, &adapter->req_list[idx]);
1108 }
1109
1110 static inline void zfcp_reqlist_remove(struct zfcp_adapter *adapter,
1111                                        struct zfcp_fsf_req *fsf_req)
1112 {
1113         list_del(&fsf_req->list);
1114 }
1115
1116 static inline struct zfcp_fsf_req *
1117 zfcp_reqlist_find(struct zfcp_adapter *adapter, unsigned long req_id)
1118 {
1119         struct zfcp_fsf_req *request;
1120         unsigned int idx;
1121
1122         idx = zfcp_reqlist_hash(req_id);
1123         list_for_each_entry(request, &adapter->req_list[idx], list)
1124                 if (request->req_id == req_id)
1125                         return request;
1126         return NULL;
1127 }
1128
1129 /*
1130  *  functions needed for reference/usage counting
1131  */
1132
1133 static inline void
1134 zfcp_unit_get(struct zfcp_unit *unit)
1135 {
1136         atomic_inc(&unit->refcount);
1137 }
1138
1139 static inline void
1140 zfcp_unit_put(struct zfcp_unit *unit)
1141 {
1142         if (atomic_dec_return(&unit->refcount) == 0)
1143                 wake_up(&unit->remove_wq);
1144 }
1145
1146 static inline void
1147 zfcp_unit_wait(struct zfcp_unit *unit)
1148 {
1149         wait_event(unit->remove_wq, atomic_read(&unit->refcount) == 0);
1150 }
1151
1152 static inline void
1153 zfcp_port_get(struct zfcp_port *port)
1154 {
1155         atomic_inc(&port->refcount);
1156 }
1157
1158 static inline void
1159 zfcp_port_put(struct zfcp_port *port)
1160 {
1161         if (atomic_dec_return(&port->refcount) == 0)
1162                 wake_up(&port->remove_wq);
1163 }
1164
1165 static inline void
1166 zfcp_port_wait(struct zfcp_port *port)
1167 {
1168         wait_event(port->remove_wq, atomic_read(&port->refcount) == 0);
1169 }
1170
1171 static inline void
1172 zfcp_adapter_get(struct zfcp_adapter *adapter)
1173 {
1174         atomic_inc(&adapter->refcount);
1175 }
1176
1177 static inline void
1178 zfcp_adapter_put(struct zfcp_adapter *adapter)
1179 {
1180         if (atomic_dec_return(&adapter->refcount) == 0)
1181                 wake_up(&adapter->remove_wq);
1182 }
1183
1184 static inline void
1185 zfcp_adapter_wait(struct zfcp_adapter *adapter)
1186 {
1187         wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
1188 }
1189
1190 #endif /* ZFCP_DEF_H */