drivers/s390/scsi/zfcp_def.h

   1 /*
   2  * zfcp device driver
   3  *
   4  * Global definitions for the zfcp device driver.
   5  *
   6  * Copyright IBM Corporation 2002, 2008
   7  */
   8
   9 #ifndef ZFCP_DEF_H
  10 #define ZFCP_DEF_H
  11
  12 /*************************** INCLUDES *****************************************/
  13
  14 #include <linux/init.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/major.h>
  17 #include <linux/blkdev.h>
  18 #include <linux/delay.h>
  19 #include <linux/timer.h>
  20 #include <linux/slab.h>
  21 #include <linux/mempool.h>
  22 #include <linux/syscalls.h>
  23 #include <linux/scatterlist.h>
  24 #include <linux/ioctl.h>
  25 #include <scsi/scsi.h>
  26 #include <scsi/scsi_tcq.h>
  27 #include <scsi/scsi_cmnd.h>
  28 #include <scsi/scsi_device.h>
  29 #include <scsi/scsi_host.h>
  30 #include <scsi/scsi_transport.h>
  31 #include <scsi/scsi_transport_fc.h>
  32 #include <asm/ccwdev.h>
  33 #include <asm/qdio.h>
  34 #include <asm/debug.h>
  35 #include <asm/ebcdic.h>
  36 #include "zfcp_dbf.h"
  37 #include "zfcp_fsf.h"
  38
  39
  40 /********************* GENERAL DEFINES *********************************/
  41
  42 /**
  43  * zfcp_sg_to_address - determine kernel address from struct scatterlist
  44  * @list: struct scatterlist
  45  * Return: kernel address
  46  */
  47 static inline void *
  48 zfcp_sg_to_address(struct scatterlist *list)
  49 {
  50         return sg_virt(list);
  51 }
  52
  53 /**
  54  * zfcp_address_to_sg - set up struct scatterlist from kernel address
  55  * @address: kernel address
  56  * @list: struct scatterlist
  57  * @size: buffer size
  58  */
  59 static inline void
  60 zfcp_address_to_sg(void *address, struct scatterlist *list, unsigned int size)
  61 {
  62         sg_set_buf(list, address, size);
  63 }
  64
  65 #define REQUEST_LIST_SIZE 128
  66
  67 /********************* SCSI SPECIFIC DEFINES *********************************/
  68 #define ZFCP_SCSI_ER_TIMEOUT                    (10*HZ)
  69
  70 /********************* CIO/QDIO SPECIFIC DEFINES *****************************/
  71
  72 /* Adapter Identification Parameters */
  73 #define ZFCP_CONTROL_UNIT_TYPE  0x1731
  74 #define ZFCP_CONTROL_UNIT_MODEL 0x03
  75 #define ZFCP_DEVICE_TYPE        0x1732
  76 #define ZFCP_DEVICE_MODEL       0x03
  77 #define ZFCP_DEVICE_MODEL_PRIV  0x04
  78
  79 /* DMQ bug workaround: don't use last SBALE */
  80 #define ZFCP_MAX_SBALES_PER_SBAL        (QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
  81
  82 /* index of last SBALE (with respect to DMQ bug workaround) */
  83 #define ZFCP_LAST_SBALE_PER_SBAL        (ZFCP_MAX_SBALES_PER_SBAL - 1)
  84
  85 /* max. number of (data buffer) SBALEs in largest SBAL chain */
  86 #define ZFCP_MAX_SBALES_PER_REQ         \
  87         (FSF_MAX_SBALS_PER_REQ * ZFCP_MAX_SBALES_PER_SBAL - 2)
  88         /* request ID + QTCB in SBALE 0 + 1 of first SBAL in chain */
  89
  90 #define ZFCP_MAX_SECTORS (ZFCP_MAX_SBALES_PER_REQ * 8)
  91         /* max. number of (data buffer) SBALEs in largest SBAL chain
  92            multiplied with number of sectors per 4k block */
  93
  94 /********************* FSF SPECIFIC DEFINES *********************************/
  95
  96 /* ATTENTION: value must not be used by hardware */
  97 #define FSF_QTCB_UNSOLICITED_STATUS             0x6305
  98
  99 /* timeout value for "default timer" for fsf requests */
 100 #define ZFCP_FSF_REQUEST_TIMEOUT (60*HZ)
 101
 102 /*************** FIBRE CHANNEL PROTOCOL SPECIFIC DEFINES ********************/
 103
 104 typedef unsigned long long wwn_t;
 105 typedef unsigned long long fcp_lun_t;
 106 /* data length field may be at variable position in FCP-2 FCP_CMND IU */
 107 typedef unsigned int       fcp_dl_t;
 108
 109 /* timeout for name-server lookup (in seconds) */
 110 #define ZFCP_NS_GID_PN_TIMEOUT          10
 111
 112 /* task attribute values in FCP-2 FCP_CMND IU */
 113 #define SIMPLE_Q        0
 114 #define HEAD_OF_Q       1
 115 #define ORDERED_Q       2
 116 #define ACA_Q           4
 117 #define UNTAGGED        5
 118
 119 /* task management flags in FCP-2 FCP_CMND IU */
 120 #define FCP_CLEAR_ACA           0x40
 121 #define FCP_TARGET_RESET        0x20
 122 #define FCP_LOGICAL_UNIT_RESET  0x10
 123 #define FCP_CLEAR_TASK_SET      0x04
 124 #define FCP_ABORT_TASK_SET      0x02
 125
 126 #define FCP_CDB_LENGTH          16
 127
 128 #define ZFCP_DID_MASK           0x00FFFFFF
 129
 130 /* FCP(-2) FCP_CMND IU */
 131 struct fcp_cmnd_iu {
 132         fcp_lun_t fcp_lun;         /* FCP logical unit number */
 133         u8  crn;                   /* command reference number */
 134         u8  reserved0:5;           /* reserved */
 135         u8  task_attribute:3;      /* task attribute */
 136         u8  task_management_flags; /* task management flags */
 137         u8  add_fcp_cdb_length:6;  /* additional FCP_CDB length */
 138         u8  rddata:1;              /* read data */
 139         u8  wddata:1;              /* write data */
 140         u8  fcp_cdb[FCP_CDB_LENGTH];
 141 } __attribute__((packed));
 142
 143 /* FCP(-2) FCP_RSP IU */
 144 struct fcp_rsp_iu {
 145         u8  reserved0[10];
 146         union {
 147                 struct {
 148                         u8 reserved1:3;
 149                         u8 fcp_conf_req:1;
 150                         u8 fcp_resid_under:1;
 151                         u8 fcp_resid_over:1;
 152                         u8 fcp_sns_len_valid:1;
 153                         u8 fcp_rsp_len_valid:1;
 154                 } bits;
 155                 u8 value;
 156         } validity;
 157         u8  scsi_status;
 158         u32 fcp_resid;
 159         u32 fcp_sns_len;
 160         u32 fcp_rsp_len;
 161 } __attribute__((packed));
 162
 163
 164 #define RSP_CODE_GOOD            0
 165 #define RSP_CODE_LENGTH_MISMATCH 1
 166 #define RSP_CODE_FIELD_INVALID   2
 167 #define RSP_CODE_RO_MISMATCH     3
 168 #define RSP_CODE_TASKMAN_UNSUPP  4
 169 #define RSP_CODE_TASKMAN_FAILED  5
 170
 171 /* see fc-fs */
 172 #define LS_RSCN  0x61
 173 #define LS_LOGO  0x05
 174 #define LS_PLOGI 0x03
 175
 176 struct fcp_rscn_head {
 177         u8  command;
 178         u8  page_length; /* always 0x04 */
 179         u16 payload_len;
 180 } __attribute__((packed));
 181
 182 struct fcp_rscn_element {
 183         u8  reserved:2;
 184         u8  event_qual:4;
 185         u8  addr_format:2;
 186         u32 nport_did:24;
 187 } __attribute__((packed));
 188
 189 #define ZFCP_PORT_ADDRESS   0x0
 190 #define ZFCP_AREA_ADDRESS   0x1
 191 #define ZFCP_DOMAIN_ADDRESS 0x2
 192 #define ZFCP_FABRIC_ADDRESS 0x3
 193
 194 #define ZFCP_PORTS_RANGE_PORT   0xFFFFFF
 195 #define ZFCP_PORTS_RANGE_AREA   0xFFFF00
 196 #define ZFCP_PORTS_RANGE_DOMAIN 0xFF0000
 197 #define ZFCP_PORTS_RANGE_FABRIC 0x000000
 198
 199 #define ZFCP_NO_PORTS_PER_AREA    0x100
 200 #define ZFCP_NO_PORTS_PER_DOMAIN  0x10000
 201 #define ZFCP_NO_PORTS_PER_FABRIC  0x1000000
 202
 203 /* see fc-ph */
 204 struct fcp_logo {
 205         u32 command;
 206         u32 nport_did;
 207         wwn_t nport_wwpn;
 208 } __attribute__((packed));
 209
 210 /*
 211  * FC-FS stuff
 212  */
 213 #define R_A_TOV                         10 /* seconds */
 214
 215 #define ZFCP_LS_RLS                     0x0f
 216 #define ZFCP_LS_ADISC                   0x52
 217 #define ZFCP_LS_RPS                     0x56
 218 #define ZFCP_LS_RSCN                    0x61
 219 #define ZFCP_LS_RNID                    0x78
 220
 221 struct zfcp_ls_rjt_par {
 222         u8 action;
 223         u8 reason_code;
 224         u8 reason_expl;
 225         u8 vendor_unique;
 226 } __attribute__ ((packed));
 227
 228 struct zfcp_ls_adisc {
 229         u8              code;
 230         u8              field[3];
 231         u32             hard_nport_id;
 232         u64             wwpn;
 233         u64             wwnn;
 234         u32             nport_id;
 235 } __attribute__ ((packed));
 236
 237 struct zfcp_ls_adisc_acc {
 238         u8              code;
 239         u8              field[3];
 240         u32             hard_nport_id;
 241         u64             wwpn;
 242         u64             wwnn;
 243         u32             nport_id;
 244 } __attribute__ ((packed));
 245
 246 struct zfcp_rc_entry {
 247         u8 code;
 248         const char *description;
 249 };
 250
 251 /*
 252  * FC-GS-2 stuff
 253  */
 254 #define ZFCP_CT_REVISION                0x01
 255 #define ZFCP_CT_DIRECTORY_SERVICE       0xFC
 256 #define ZFCP_CT_NAME_SERVER             0x02
 257 #define ZFCP_CT_SYNCHRONOUS             0x00
 258 #define ZFCP_CT_SCSI_FCP                0x08
 259 #define ZFCP_CT_UNABLE_TO_PERFORM_CMD   0x09
 260 #define ZFCP_CT_GID_PN                  0x0121
 261 #define ZFCP_CT_GPN_FT                  0x0172
 262 #define ZFCP_CT_MAX_SIZE                0x1020
 263 #define ZFCP_CT_ACCEPT                  0x8002
 264 #define ZFCP_CT_REJECT                  0x8001
 265
 266 /*
 267  * FC-GS-4 stuff
 268  */
 269 #define ZFCP_CT_TIMEOUT                 (3 * R_A_TOV)
 270
 271 /*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/
 272
 273 /*
 274  * Note, the leftmost status byte is common among adapter, port
 275  * and unit
 276  */
 277 #define ZFCP_COMMON_FLAGS                       0xfff00000
 278
 279 /* common status bits */
 280 #define ZFCP_STATUS_COMMON_REMOVE               0x80000000
 281 #define ZFCP_STATUS_COMMON_RUNNING              0x40000000
 282 #define ZFCP_STATUS_COMMON_ERP_FAILED           0x20000000
 283 #define ZFCP_STATUS_COMMON_UNBLOCKED            0x10000000
 284 #define ZFCP_STATUS_COMMON_OPENING              0x08000000
 285 #define ZFCP_STATUS_COMMON_OPEN                 0x04000000
 286 #define ZFCP_STATUS_COMMON_CLOSING              0x02000000
 287 #define ZFCP_STATUS_COMMON_ERP_INUSE            0x01000000
 288 #define ZFCP_STATUS_COMMON_ACCESS_DENIED        0x00800000
 289 #define ZFCP_STATUS_COMMON_ACCESS_BOXED         0x00400000
 290 #define ZFCP_STATUS_COMMON_NOESC                0x00200000
 291
 292 /* adapter status */
 293 #define ZFCP_STATUS_ADAPTER_QDIOUP              0x00000002
 294 #define ZFCP_STATUS_ADAPTER_REGISTERED          0x00000004
 295 #define ZFCP_STATUS_ADAPTER_XCONFIG_OK          0x00000008
 296 #define ZFCP_STATUS_ADAPTER_HOST_CON_INIT       0x00000010
 297 #define ZFCP_STATUS_ADAPTER_ERP_THREAD_UP       0x00000020
 298 #define ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL     0x00000080
 299 #define ZFCP_STATUS_ADAPTER_ERP_PENDING         0x00000100
 300 #define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED      0x00000200
 301 #define ZFCP_STATUS_ADAPTER_XPORT_OK            0x00000800
 302
 303 /* FC-PH/FC-GS well-known address identifiers for generic services */
 304 #define ZFCP_DID_MANAGEMENT_SERVICE             0xFFFFFA
 305 #define ZFCP_DID_TIME_SERVICE                   0xFFFFFB
 306 #define ZFCP_DID_DIRECTORY_SERVICE              0xFFFFFC
 307 #define ZFCP_DID_ALIAS_SERVICE                  0xFFFFF8
 308 #define ZFCP_DID_KEY_DISTRIBUTION_SERVICE       0xFFFFF7
 309
 310 /* remote port status */
 311 #define ZFCP_STATUS_PORT_PHYS_OPEN              0x00000001
 312 #define ZFCP_STATUS_PORT_DID_DID                0x00000002
 313 #define ZFCP_STATUS_PORT_PHYS_CLOSING           0x00000004
 314 #define ZFCP_STATUS_PORT_NO_WWPN                0x00000008
 315 #define ZFCP_STATUS_PORT_NO_SCSI_ID             0x00000010
 316 #define ZFCP_STATUS_PORT_INVALID_WWPN           0x00000020
 317
 318 /* for ports with well known addresses */
 319 #define ZFCP_STATUS_PORT_WKA \
 320                 (ZFCP_STATUS_PORT_NO_WWPN | \
 321                  ZFCP_STATUS_PORT_NO_SCSI_ID)
 322
 323 /* logical unit status */
 324 #define ZFCP_STATUS_UNIT_TEMPORARY              0x00000002
 325 #define ZFCP_STATUS_UNIT_SHARED                 0x00000004
 326 #define ZFCP_STATUS_UNIT_READONLY               0x00000008
 327 #define ZFCP_STATUS_UNIT_REGISTERED             0x00000010
 328 #define ZFCP_STATUS_UNIT_SCSI_WORK_PENDING      0x00000020
 329
 330 /* FSF request status (this does not have a common part) */
 331 #define ZFCP_STATUS_FSFREQ_NOT_INIT             0x00000000
 332 #define ZFCP_STATUS_FSFREQ_POOL                 0x00000001
 333 #define ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT      0x00000002
 334 #define ZFCP_STATUS_FSFREQ_COMPLETED            0x00000004
 335 #define ZFCP_STATUS_FSFREQ_ERROR                0x00000008
 336 #define ZFCP_STATUS_FSFREQ_CLEANUP              0x00000010
 337 #define ZFCP_STATUS_FSFREQ_ABORTING             0x00000020
 338 #define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED       0x00000040
 339 #define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED       0x00000080
 340 #define ZFCP_STATUS_FSFREQ_ABORTED              0x00000100
 341 #define ZFCP_STATUS_FSFREQ_TMFUNCFAILED         0x00000200
 342 #define ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP        0x00000400
 343 #define ZFCP_STATUS_FSFREQ_RETRY                0x00000800
 344 #define ZFCP_STATUS_FSFREQ_DISMISSED            0x00001000
 345
 346 /************************* STRUCTURE DEFINITIONS *****************************/
 347
 348 struct zfcp_fsf_req;
 349
 350 /* holds various memory pools of an adapter */
 351 struct zfcp_adapter_mempool {
 352         mempool_t *fsf_req_erp;
 353         mempool_t *fsf_req_scsi;
 354         mempool_t *fsf_req_abort;
 355         mempool_t *fsf_req_status_read;
 356         mempool_t *data_status_read;
 357         mempool_t *data_gid_pn;
 358 };
 359
 360 /*
 361  * header for CT_IU
 362  */
 363 struct ct_hdr {
 364         u8 revision;            // 0x01
 365         u8 in_id[3];            // 0x00
 366         u8 gs_type;             // 0xFC Directory Service
 367         u8 gs_subtype;          // 0x02 Name Server
 368         u8 options;             // 0x00 single bidirectional exchange
 369         u8 reserved0;
 370         u16 cmd_rsp_code;       // 0x0121 GID_PN, or 0x0100 GA_NXT
 371         u16 max_res_size;       // <= (4096 - 16) / 4
 372         u8 reserved1;
 373         u8 reason_code;
 374         u8 reason_code_expl;
 375         u8 vendor_unique;
 376 } __attribute__ ((packed));
 377
 378 /* nameserver request CT_IU -- for requests where
 379  * a port name is required */
 380 struct ct_iu_gid_pn_req {
 381         struct ct_hdr header;
 382         wwn_t wwpn;
 383 } __attribute__ ((packed));
 384
 385 /* FS_ACC IU and data unit for GID_PN nameserver request */
 386 struct ct_iu_gid_pn_resp {
 387         struct ct_hdr header;
 388         u32 d_id;
 389 } __attribute__ ((packed));
 390
 391 typedef void (*zfcp_send_ct_handler_t)(unsigned long);
 392
 393 /**
 394  * struct zfcp_send_ct - used to pass parameters to function zfcp_fsf_send_ct
 395  * @port: port where the request is sent to
 396  * @req: scatter-gather list for request
 397  * @resp: scatter-gather list for response
 398  * @req_count: number of elements in request scatter-gather list
 399  * @resp_count: number of elements in response scatter-gather list
 400  * @handler: handler function (called for response to the request)
 401  * @handler_data: data passed to handler function
 402  * @timeout: FSF timeout for this request
 403  * @completion: completion for synchronization purposes
 404  * @status: used to pass error status to calling function
 405  */
 406 struct zfcp_send_ct {
 407         struct zfcp_port *port;
 408         struct scatterlist *req;
 409         struct scatterlist *resp;
 410         unsigned int req_count;
 411         unsigned int resp_count;
 412         zfcp_send_ct_handler_t handler;
 413         unsigned long handler_data;
 414         int timeout;
 415         struct completion *completion;
 416         int status;
 417 };
 418
 419 /* used for name server requests in error recovery */
 420 struct zfcp_gid_pn_data {
 421         struct zfcp_send_ct ct;
 422         struct scatterlist req;
 423         struct scatterlist resp;
 424         struct ct_iu_gid_pn_req ct_iu_req;
 425         struct ct_iu_gid_pn_resp ct_iu_resp;
 426         struct zfcp_port *port;
 427 };
 428
 429 typedef void (*zfcp_send_els_handler_t)(unsigned long);
 430
 431 /**
 432  * struct zfcp_send_els - used to pass parameters to function zfcp_fsf_send_els
 433  * @adapter: adapter where request is sent from
 434  * @port: port where ELS is destinated (port reference count has to be increased)
 435  * @d_id: destiniation id of port where request is sent to
 436  * @req: scatter-gather list for request
 437  * @resp: scatter-gather list for response
 438  * @req_count: number of elements in request scatter-gather list
 439  * @resp_count: number of elements in response scatter-gather list
 440  * @handler: handler function (called for response to the request)
 441  * @handler_data: data passed to handler function
 442  * @completion: completion for synchronization purposes
 443  * @ls_code: hex code of ELS command
 444  * @status: used to pass error status to calling function
 445  */
 446 struct zfcp_send_els {
 447         struct zfcp_adapter *adapter;
 448         struct zfcp_port *port;
 449         u32 d_id;
 450         struct scatterlist *req;
 451         struct scatterlist *resp;
 452         unsigned int req_count;
 453         unsigned int resp_count;
 454         zfcp_send_els_handler_t handler;
 455         unsigned long handler_data;
 456         struct completion *completion;
 457         int ls_code;
 458         int status;
 459 };
 460
 461 struct zfcp_qdio_queue {
 462         struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q]; /* SBALs */
 463         u8                 first;             /* index of next free bfr
 464                                                  in queue (free_count>0) */
 465         atomic_t           count;             /* number of free buffers
 466                                                  in queue */
 467         spinlock_t         lock;              /* lock for operations on queue */
 468         int                pci_batch;         /* SBALs since PCI indication
 469                                                  was last set */
 470 };
 471
 472 struct zfcp_erp_action {
 473         struct list_head list;
 474         int action;                   /* requested action code */
 475         struct zfcp_adapter *adapter; /* device which should be recovered */
 476         struct zfcp_port *port;
 477         struct zfcp_unit *unit;
 478         volatile u32 status;          /* recovery status */
 479         u32 step;                     /* active step of this erp action */
 480         struct zfcp_fsf_req *fsf_req; /* fsf request currently pending
 481                                          for this action */
 482         struct timer_list timer;
 483 };
 484
 485 struct fsf_latency_record {
 486         u32 min;
 487         u32 max;
 488         u64 sum;
 489 };
 490
 491 struct latency_cont {
 492         struct fsf_latency_record channel;
 493         struct fsf_latency_record fabric;
 494         u64 counter;
 495 };
 496
 497 struct zfcp_latencies {
 498         struct latency_cont read;
 499         struct latency_cont write;
 500         struct latency_cont cmd;
 501         spinlock_t lock;
 502 };
 503
 504 struct zfcp_adapter {
 505         struct list_head        list;              /* list of adapters */
 506         atomic_t                refcount;          /* reference count */
 507         wait_queue_head_t       remove_wq;         /* can be used to wait for
 508                                                       refcount drop to zero */
 509         wwn_t                   peer_wwnn;         /* P2P peer WWNN */
 510         wwn_t                   peer_wwpn;         /* P2P peer WWPN */
 511         u32                     peer_d_id;         /* P2P peer D_ID */
 512         struct ccw_device       *ccw_device;       /* S/390 ccw device */
 513         u32                     hydra_version;     /* Hydra version */
 514         u32                     fsf_lic_version;
 515         u32                     adapter_features;  /* FCP channel features */
 516         u32                     connection_features; /* host connection features */
 517         u32                     hardware_version;  /* of FCP channel */
 518         u16                     timer_ticks;       /* time int for a tick */
 519         struct Scsi_Host        *scsi_host;        /* Pointer to mid-layer */
 520         struct list_head        port_list_head;    /* remote port list */
 521         struct list_head        port_remove_lh;    /* head of ports to be
 522                                                       removed */
 523         u32                     ports;             /* number of remote ports */
 524         unsigned long           req_no;            /* unique FSF req number */
 525         struct list_head        *req_list;         /* list of pending reqs */
 526         spinlock_t              req_list_lock;     /* request list lock */
 527         struct zfcp_qdio_queue  req_q;             /* request queue */
 528         u32                     fsf_req_seq_no;    /* FSF cmnd seq number */
 529         wait_queue_head_t       request_wq;        /* can be used to wait for
 530                                                       more avaliable SBALs */
 531         struct zfcp_qdio_queue  resp_q;    /* response queue */
 532         rwlock_t                abort_lock;        /* Protects against SCSI
 533                                                       stack abort/command
 534                                                       completion races */
 535         atomic_t                stat_miss;         /* # missing status reads*/
 536         struct work_struct      stat_work;
 537         atomic_t                status;            /* status of this adapter */
 538         struct list_head        erp_ready_head;    /* error recovery for this
 539                                                       adapter/devices */
 540         struct list_head        erp_running_head;
 541         rwlock_t                erp_lock;
 542         struct semaphore        erp_ready_sem;
 543         wait_queue_head_t       erp_thread_wqh;
 544         wait_queue_head_t       erp_done_wqh;
 545         struct zfcp_erp_action  erp_action;        /* pending error recovery */
 546         atomic_t                erp_counter;
 547         u32                     erp_total_count;   /* total nr of enqueued erp
 548                                                       actions */
 549         u32                     erp_low_mem_count; /* nr of erp actions waiting
 550                                                       for memory */
 551         struct zfcp_port        *nameserver_port;  /* adapter's nameserver */
 552         debug_info_t            *rec_dbf;
 553         debug_info_t            *hba_dbf;
 554         debug_info_t            *san_dbf;          /* debug feature areas */
 555         debug_info_t            *scsi_dbf;
 556         spinlock_t              rec_dbf_lock;
 557         spinlock_t              hba_dbf_lock;
 558         spinlock_t              san_dbf_lock;
 559         spinlock_t              scsi_dbf_lock;
 560         struct zfcp_rec_dbf_record      rec_dbf_buf;
 561         struct zfcp_hba_dbf_record      hba_dbf_buf;
 562         struct zfcp_san_dbf_record      san_dbf_buf;
 563         struct zfcp_scsi_dbf_record     scsi_dbf_buf;
 564         struct zfcp_adapter_mempool     pool;      /* Adapter memory pools */
 565         struct qdio_initialize  qdio_init_data;    /* for qdio_establish */
 566         struct device           generic_services;  /* directory for WKA ports */
 567         struct fc_host_statistics *fc_stats;
 568         struct fsf_qtcb_bottom_port *stats_reset_data;
 569         unsigned long           stats_reset;
 570         struct work_struct      scan_work;
 571 };
 572
 573 struct zfcp_port {
 574         struct device          sysfs_device;   /* sysfs device */
 575         struct fc_rport        *rport;         /* rport of fc transport class */
 576         struct list_head       list;           /* list of remote ports */
 577         atomic_t               refcount;       /* reference count */
 578         wait_queue_head_t      remove_wq;      /* can be used to wait for
 579                                                   refcount drop to zero */
 580         struct zfcp_adapter    *adapter;       /* adapter used to access port */
 581         struct list_head       unit_list_head; /* head of logical unit list */
 582         struct list_head       unit_remove_lh; /* head of luns to be removed
 583                                                   list */
 584         u32                    units;          /* # of logical units in list */
 585         atomic_t               status;         /* status of this remote port */
 586         wwn_t                  wwnn;           /* WWNN if known */
 587         wwn_t                  wwpn;           /* WWPN */
 588         u32                    d_id;           /* D_ID */
 589         u32                    handle;         /* handle assigned by FSF */
 590         struct zfcp_erp_action erp_action;     /* pending error recovery */
 591         atomic_t               erp_counter;
 592         u32                    maxframe_size;
 593         u32                    supported_classes;
 594 };
 595
 596 struct zfcp_unit {
 597         struct device          sysfs_device;   /* sysfs device */
 598         struct list_head       list;           /* list of logical units */
 599         atomic_t               refcount;       /* reference count */
 600         wait_queue_head_t      remove_wq;      /* can be used to wait for
 601                                                   refcount drop to zero */
 602         struct zfcp_port       *port;          /* remote port of unit */
 603         atomic_t               status;         /* status of this logical unit */
 604         unsigned int           scsi_lun;       /* own SCSI LUN */
 605         fcp_lun_t              fcp_lun;        /* own FCP_LUN */
 606         u32                    handle;         /* handle assigned by FSF */
 607         struct scsi_device     *device;        /* scsi device struct pointer */
 608         struct zfcp_erp_action erp_action;     /* pending error recovery */
 609         atomic_t               erp_counter;
 610         struct zfcp_latencies   latencies;
 611 };
 612
 613 /* FSF request */
 614 struct zfcp_fsf_req {
 615         struct list_head       list;           /* list of FSF requests */
 616         unsigned long          req_id;         /* unique request ID */
 617         struct zfcp_adapter    *adapter;       /* adapter request belongs to */
 618         u8                     sbal_number;    /* nr of SBALs free for use */
 619         u8                     sbal_first;     /* first SBAL for this request */
 620         u8                     sbal_last;      /* last SBAL for this request */
 621         u8                     sbal_limit;      /* last possible SBAL for
 622                                                   this reuest */
 623         u8                     sbale_curr;     /* current SBALE during creation
 624                                                   of request */
 625         u8                      sbal_response;  /* SBAL used in interrupt */
 626         wait_queue_head_t      completion_wq;  /* can be used by a routine
 627                                                   to wait for completion */
 628         volatile u32           status;         /* status of this request */
 629         u32                    fsf_command;    /* FSF Command copy */
 630         struct fsf_qtcb        *qtcb;          /* address of associated QTCB */
 631         u32                    seq_no;         /* Sequence number of request */
 632         void                    *data;           /* private data of request */
 633         struct timer_list     timer;           /* used for erp or scsi er */
 634         struct zfcp_erp_action *erp_action;    /* used if this request is
 635                                                   issued on behalf of erp */
 636         mempool_t              *pool;          /* used if request was alloacted
 637                                                   from emergency pool */
 638         unsigned long long     issued;         /* request sent time (STCK) */
 639         struct zfcp_unit       *unit;
 640         void                    (*handler)(struct zfcp_fsf_req *);
 641 };
 642
 643 /* driver data */
 644 struct zfcp_data {
 645         struct scsi_host_template scsi_host_template;
 646         struct scsi_transport_template *scsi_transport_template;
 647         atomic_t                status;             /* Module status flags */
 648         struct list_head        adapter_list_head;  /* head of adapter list */
 649         struct list_head        adapter_remove_lh;  /* head of adapters to be
 650                                                        removed */
 651         u32                     adapters;           /* # of adapters in list */
 652         rwlock_t                config_lock;        /* serialises changes
 653                                                        to adapter/port/unit
 654                                                        lists */
 655         struct semaphore        config_sema;        /* serialises configuration
 656                                                        changes */
 657         atomic_t                loglevel;            /* current loglevel */
 658         char                    init_busid[BUS_ID_SIZE];
 659         wwn_t                   init_wwpn;
 660         fcp_lun_t               init_fcp_lun;
 661         struct kmem_cache               *fsf_req_qtcb_cache;
 662         struct kmem_cache               *sr_buffer_cache;
 663         struct kmem_cache               *gid_pn_cache;
 664 };
 665
 666 /* struct used by memory pools for fsf_requests */
 667 struct zfcp_fsf_req_qtcb {
 668         struct zfcp_fsf_req fsf_req;
 669         struct fsf_qtcb qtcb;
 670 };
 671
 672 /********************** ZFCP SPECIFIC DEFINES ********************************/
 673
 674 #define ZFCP_REQ_AUTO_CLEANUP   0x00000002
 675 #define ZFCP_REQ_NO_QTCB        0x00000008
 676
 677 #define ZFCP_SET                0x00000100
 678 #define ZFCP_CLEAR              0x00000200
 679
 680 #ifndef atomic_test_mask
 681 #define atomic_test_mask(mask, target) \
 682            ((atomic_read(target) & mask) == mask)
 683 #endif
 684
 685 #define zfcp_get_busid_by_adapter(adapter) (adapter->ccw_device->dev.bus_id)
 686 #define zfcp_get_busid_by_port(port) (zfcp_get_busid_by_adapter(port->adapter))
 687 #define zfcp_get_busid_by_unit(unit) (zfcp_get_busid_by_port(unit->port))
 688
 689 /*
 690  * Helper functions for request ID management.
 691  */
 692 static inline int zfcp_reqlist_hash(unsigned long req_id)
 693 {
 694         return req_id % REQUEST_LIST_SIZE;
 695 }
 696
 697 static inline void zfcp_reqlist_remove(struct zfcp_adapter *adapter,
 698                                        struct zfcp_fsf_req *fsf_req)
 699 {
 700         list_del(&fsf_req->list);
 701 }
 702
 703 static inline struct zfcp_fsf_req *
 704 zfcp_reqlist_find(struct zfcp_adapter *adapter, unsigned long req_id)
 705 {
 706         struct zfcp_fsf_req *request;
 707         unsigned int idx;
 708
 709         idx = zfcp_reqlist_hash(req_id);
 710         list_for_each_entry(request, &adapter->req_list[idx], list)
 711                 if (request->req_id == req_id)
 712                         return request;
 713         return NULL;
 714 }
 715
 716 static inline struct zfcp_fsf_req *
 717 zfcp_reqlist_find_safe(struct zfcp_adapter *adapter, struct zfcp_fsf_req *req)
 718 {
 719         struct zfcp_fsf_req *request;
 720         unsigned int idx;
 721
 722         for (idx = 0; idx < REQUEST_LIST_SIZE; idx++) {
 723                 list_for_each_entry(request, &adapter->req_list[idx], list)
 724                         if (request == req)
 725                                 return request;
 726         }
 727         return NULL;
 728 }
 729
 730 /*
 731  *  functions needed for reference/usage counting
 732  */
 733
 734 static inline void
 735 zfcp_unit_get(struct zfcp_unit *unit)
 736 {
 737         atomic_inc(&unit->refcount);
 738 }
 739
 740 static inline void
 741 zfcp_unit_put(struct zfcp_unit *unit)
 742 {
 743         if (atomic_dec_return(&unit->refcount) == 0)
 744                 wake_up(&unit->remove_wq);
 745 }
 746
 747 static inline void
 748 zfcp_unit_wait(struct zfcp_unit *unit)
 749 {
 750         wait_event(unit->remove_wq, atomic_read(&unit->refcount) == 0);
 751 }
 752
 753 static inline void
 754 zfcp_port_get(struct zfcp_port *port)
 755 {
 756         atomic_inc(&port->refcount);
 757 }
 758
 759 static inline void
 760 zfcp_port_put(struct zfcp_port *port)
 761 {
 762         if (atomic_dec_return(&port->refcount) == 0)
 763                 wake_up(&port->remove_wq);
 764 }
 765
 766 static inline void
 767 zfcp_port_wait(struct zfcp_port *port)
 768 {
 769         wait_event(port->remove_wq, atomic_read(&port->refcount) == 0);
 770 }
 771
 772 static inline void
 773 zfcp_adapter_get(struct zfcp_adapter *adapter)
 774 {
 775         atomic_inc(&adapter->refcount);
 776 }
 777
 778 static inline void
 779 zfcp_adapter_put(struct zfcp_adapter *adapter)
 780 {
 781         if (atomic_dec_return(&adapter->refcount) == 0)
 782                 wake_up(&adapter->remove_wq);
 783 }
 784
 785 static inline void
 786 zfcp_adapter_wait(struct zfcp_adapter *adapter)
 787 {
 788         wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
 789 }
 790
 791 #endif /* ZFCP_DEF_H */