git.oblomov.eu Git - linux-2.6/blob - 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 <asm/sysinfo.h>
  37 #include "zfcp_dbf.h"
  38 #include "zfcp_fsf.h"
  39
  40
  41 /********************* GENERAL DEFINES *********************************/
  42
  43 #define REQUEST_LIST_SIZE 128
  44
  45 /********************* SCSI SPECIFIC DEFINES *********************************/
  46 #define ZFCP_SCSI_ER_TIMEOUT                    (10*HZ)
  47
  48 /********************* CIO/QDIO SPECIFIC DEFINES *****************************/
  49
  50 /* Adapter Identification Parameters */
  51 #define ZFCP_CONTROL_UNIT_TYPE  0x1731
  52 #define ZFCP_CONTROL_UNIT_MODEL 0x03
  53 #define ZFCP_DEVICE_TYPE        0x1732
  54 #define ZFCP_DEVICE_MODEL       0x03
  55 #define ZFCP_DEVICE_MODEL_PRIV  0x04
  56
  57 /* DMQ bug workaround: don't use last SBALE */
  58 #define ZFCP_MAX_SBALES_PER_SBAL        (QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
  59
  60 /* index of last SBALE (with respect to DMQ bug workaround) */
  61 #define ZFCP_LAST_SBALE_PER_SBAL        (ZFCP_MAX_SBALES_PER_SBAL - 1)
  62
  63 /* max. number of (data buffer) SBALEs in largest SBAL chain */
  64 #define ZFCP_MAX_SBALES_PER_REQ         \
  65         (FSF_MAX_SBALS_PER_REQ * ZFCP_MAX_SBALES_PER_SBAL - 2)
  66         /* request ID + QTCB in SBALE 0 + 1 of first SBAL in chain */
  67
  68 #define ZFCP_MAX_SECTORS (ZFCP_MAX_SBALES_PER_REQ * 8)
  69         /* max. number of (data buffer) SBALEs in largest SBAL chain
  70            multiplied with number of sectors per 4k block */
  71
  72 /********************* FSF SPECIFIC DEFINES *********************************/
  73
  74 /* ATTENTION: value must not be used by hardware */
  75 #define FSF_QTCB_UNSOLICITED_STATUS             0x6305
  76
  77 /* timeout value for "default timer" for fsf requests */
  78 #define ZFCP_FSF_REQUEST_TIMEOUT (60*HZ)
  79
  80 /*************** FIBRE CHANNEL PROTOCOL SPECIFIC DEFINES ********************/
  81
  82 /* timeout for name-server lookup (in seconds) */
  83 #define ZFCP_NS_GID_PN_TIMEOUT          10
  84
  85 /* task attribute values in FCP-2 FCP_CMND IU */
  86 #define SIMPLE_Q        0
  87 #define HEAD_OF_Q       1
  88 #define ORDERED_Q       2
  89 #define ACA_Q           4
  90 #define UNTAGGED        5
  91
  92 /* task management flags in FCP-2 FCP_CMND IU */
  93 #define FCP_CLEAR_ACA           0x40
  94 #define FCP_TARGET_RESET        0x20
  95 #define FCP_LOGICAL_UNIT_RESET  0x10
  96 #define FCP_CLEAR_TASK_SET      0x04
  97 #define FCP_ABORT_TASK_SET      0x02
  98
  99 #define FCP_CDB_LENGTH          16
 100
 101 #define ZFCP_DID_MASK           0x00FFFFFF
 102
 103 /* FCP(-2) FCP_CMND IU */
 104 struct fcp_cmnd_iu {
 105         u64 fcp_lun;       /* FCP logical unit number */
 106         u8  crn;                   /* command reference number */
 107         u8  reserved0:5;           /* reserved */
 108         u8  task_attribute:3;      /* task attribute */
 109         u8  task_management_flags; /* task management flags */
 110         u8  add_fcp_cdb_length:6;  /* additional FCP_CDB length */
 111         u8  rddata:1;              /* read data */
 112         u8  wddata:1;              /* write data */
 113         u8  fcp_cdb[FCP_CDB_LENGTH];
 114 } __attribute__((packed));
 115
 116 /* FCP(-2) FCP_RSP IU */
 117 struct fcp_rsp_iu {
 118         u8  reserved0[10];
 119         union {
 120                 struct {
 121                         u8 reserved1:3;
 122                         u8 fcp_conf_req:1;
 123                         u8 fcp_resid_under:1;
 124                         u8 fcp_resid_over:1;
 125                         u8 fcp_sns_len_valid:1;
 126                         u8 fcp_rsp_len_valid:1;
 127                 } bits;
 128                 u8 value;
 129         } validity;
 130         u8  scsi_status;
 131         u32 fcp_resid;
 132         u32 fcp_sns_len;
 133         u32 fcp_rsp_len;
 134 } __attribute__((packed));
 135
 136
 137 #define RSP_CODE_GOOD            0
 138 #define RSP_CODE_LENGTH_MISMATCH 1
 139 #define RSP_CODE_FIELD_INVALID   2
 140 #define RSP_CODE_RO_MISMATCH     3
 141 #define RSP_CODE_TASKMAN_UNSUPP  4
 142 #define RSP_CODE_TASKMAN_FAILED  5
 143
 144 /* see fc-fs */
 145 #define LS_RSCN  0x61
 146 #define LS_LOGO  0x05
 147 #define LS_PLOGI 0x03
 148
 149 struct fcp_rscn_head {
 150         u8  command;
 151         u8  page_length; /* always 0x04 */
 152         u16 payload_len;
 153 } __attribute__((packed));
 154
 155 struct fcp_rscn_element {
 156         u8  reserved:2;
 157         u8  event_qual:4;
 158         u8  addr_format:2;
 159         u32 nport_did:24;
 160 } __attribute__((packed));
 161
 162 #define ZFCP_PORT_ADDRESS   0x0
 163 #define ZFCP_AREA_ADDRESS   0x1
 164 #define ZFCP_DOMAIN_ADDRESS 0x2
 165 #define ZFCP_FABRIC_ADDRESS 0x3
 166
 167 #define ZFCP_PORTS_RANGE_PORT   0xFFFFFF
 168 #define ZFCP_PORTS_RANGE_AREA   0xFFFF00
 169 #define ZFCP_PORTS_RANGE_DOMAIN 0xFF0000
 170 #define ZFCP_PORTS_RANGE_FABRIC 0x000000
 171
 172 #define ZFCP_NO_PORTS_PER_AREA    0x100
 173 #define ZFCP_NO_PORTS_PER_DOMAIN  0x10000
 174 #define ZFCP_NO_PORTS_PER_FABRIC  0x1000000
 175
 176 /* see fc-ph */
 177 struct fcp_logo {
 178         u32 command;
 179         u32 nport_did;
 180         u64 nport_wwpn;
 181 } __attribute__((packed));
 182
 183 /*
 184  * FC-FS stuff
 185  */
 186 #define R_A_TOV                         10 /* seconds */
 187
 188 #define ZFCP_LS_RLS                     0x0f
 189 #define ZFCP_LS_ADISC                   0x52
 190 #define ZFCP_LS_RPS                     0x56
 191 #define ZFCP_LS_RSCN                    0x61
 192 #define ZFCP_LS_RNID                    0x78
 193
 194 struct zfcp_ls_adisc {
 195         u8              code;
 196         u8              field[3];
 197         u32             hard_nport_id;
 198         u64             wwpn;
 199         u64             wwnn;
 200         u32             nport_id;
 201 } __attribute__ ((packed));
 202
 203 /*
 204  * FC-GS-2 stuff
 205  */
 206 #define ZFCP_CT_REVISION                0x01
 207 #define ZFCP_CT_DIRECTORY_SERVICE       0xFC
 208 #define ZFCP_CT_NAME_SERVER             0x02
 209 #define ZFCP_CT_SYNCHRONOUS             0x00
 210 #define ZFCP_CT_SCSI_FCP                0x08
 211 #define ZFCP_CT_UNABLE_TO_PERFORM_CMD   0x09
 212 #define ZFCP_CT_GID_PN                  0x0121
 213 #define ZFCP_CT_GPN_FT                  0x0172
 214 #define ZFCP_CT_MAX_SIZE                0x1020
 215 #define ZFCP_CT_ACCEPT                  0x8002
 216 #define ZFCP_CT_REJECT                  0x8001
 217
 218 /*
 219  * FC-GS-4 stuff
 220  */
 221 #define ZFCP_CT_TIMEOUT                 (3 * R_A_TOV)
 222
 223 /*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/
 224
 225 /*
 226  * Note, the leftmost status byte is common among adapter, port
 227  * and unit
 228  */
 229 #define ZFCP_COMMON_FLAGS                       0xfff00000
 230
 231 /* common status bits */
 232 #define ZFCP_STATUS_COMMON_REMOVE               0x80000000
 233 #define ZFCP_STATUS_COMMON_RUNNING              0x40000000
 234 #define ZFCP_STATUS_COMMON_ERP_FAILED           0x20000000
 235 #define ZFCP_STATUS_COMMON_UNBLOCKED            0x10000000
 236 #define ZFCP_STATUS_COMMON_OPEN                 0x04000000
 237 #define ZFCP_STATUS_COMMON_ERP_INUSE            0x01000000
 238 #define ZFCP_STATUS_COMMON_ACCESS_DENIED        0x00800000
 239 #define ZFCP_STATUS_COMMON_ACCESS_BOXED         0x00400000
 240 #define ZFCP_STATUS_COMMON_NOESC                0x00200000
 241
 242 /* adapter status */
 243 #define ZFCP_STATUS_ADAPTER_QDIOUP              0x00000002
 244 #define ZFCP_STATUS_ADAPTER_XCONFIG_OK          0x00000008
 245 #define ZFCP_STATUS_ADAPTER_HOST_CON_INIT       0x00000010
 246 #define ZFCP_STATUS_ADAPTER_ERP_THREAD_UP       0x00000020
 247 #define ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL     0x00000080
 248 #define ZFCP_STATUS_ADAPTER_ERP_PENDING         0x00000100
 249 #define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED      0x00000200
 250
 251 /* FC-PH/FC-GS well-known address identifiers for generic services */
 252 #define ZFCP_DID_WKA                            0xFFFFF0
 253 #define ZFCP_DID_MANAGEMENT_SERVICE             0xFFFFFA
 254 #define ZFCP_DID_TIME_SERVICE                   0xFFFFFB
 255 #define ZFCP_DID_DIRECTORY_SERVICE              0xFFFFFC
 256 #define ZFCP_DID_ALIAS_SERVICE                  0xFFFFF8
 257 #define ZFCP_DID_KEY_DISTRIBUTION_SERVICE       0xFFFFF7
 258
 259 /* remote port status */
 260 #define ZFCP_STATUS_PORT_PHYS_OPEN              0x00000001
 261 #define ZFCP_STATUS_PORT_DID_DID                0x00000002
 262 #define ZFCP_STATUS_PORT_PHYS_CLOSING           0x00000004
 263 #define ZFCP_STATUS_PORT_NO_WWPN                0x00000008
 264 #define ZFCP_STATUS_PORT_INVALID_WWPN           0x00000020
 265
 266 /* well known address (WKA) port status*/
 267 enum zfcp_wka_status {
 268         ZFCP_WKA_PORT_OFFLINE,
 269         ZFCP_WKA_PORT_CLOSING,
 270         ZFCP_WKA_PORT_OPENING,
 271         ZFCP_WKA_PORT_ONLINE,
 272 };
 273
 274 /* logical unit status */
 275 #define ZFCP_STATUS_UNIT_SHARED                 0x00000004
 276 #define ZFCP_STATUS_UNIT_READONLY               0x00000008
 277 #define ZFCP_STATUS_UNIT_REGISTERED             0x00000010
 278 #define ZFCP_STATUS_UNIT_SCSI_WORK_PENDING      0x00000020
 279
 280 /* FSF request status (this does not have a common part) */
 281 #define ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT      0x00000002
 282 #define ZFCP_STATUS_FSFREQ_COMPLETED            0x00000004
 283 #define ZFCP_STATUS_FSFREQ_ERROR                0x00000008
 284 #define ZFCP_STATUS_FSFREQ_CLEANUP              0x00000010
 285 #define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED       0x00000040
 286 #define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED       0x00000080
 287 #define ZFCP_STATUS_FSFREQ_ABORTED              0x00000100
 288 #define ZFCP_STATUS_FSFREQ_TMFUNCFAILED         0x00000200
 289 #define ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP        0x00000400
 290 #define ZFCP_STATUS_FSFREQ_RETRY                0x00000800
 291 #define ZFCP_STATUS_FSFREQ_DISMISSED            0x00001000
 292
 293 /************************* STRUCTURE DEFINITIONS *****************************/
 294
 295 struct zfcp_fsf_req;
 296
 297 /* holds various memory pools of an adapter */
 298 struct zfcp_adapter_mempool {
 299         mempool_t *fsf_req_erp;
 300         mempool_t *fsf_req_scsi;
 301         mempool_t *fsf_req_abort;
 302         mempool_t *fsf_req_status_read;
 303         mempool_t *data_status_read;
 304         mempool_t *data_gid_pn;
 305 };
 306
 307 /*
 308  * header for CT_IU
 309  */
 310 struct ct_hdr {
 311         u8 revision;            // 0x01
 312         u8 in_id[3];            // 0x00
 313         u8 gs_type;             // 0xFC Directory Service
 314         u8 gs_subtype;          // 0x02 Name Server
 315         u8 options;             // 0x00 single bidirectional exchange
 316         u8 reserved0;
 317         u16 cmd_rsp_code;       // 0x0121 GID_PN, or 0x0100 GA_NXT
 318         u16 max_res_size;       // <= (4096 - 16) / 4
 319         u8 reserved1;
 320         u8 reason_code;
 321         u8 reason_code_expl;
 322         u8 vendor_unique;
 323 } __attribute__ ((packed));
 324
 325 /* nameserver request CT_IU -- for requests where
 326  * a port name is required */
 327 struct ct_iu_gid_pn_req {
 328         struct ct_hdr header;
 329         u64 wwpn;
 330 } __attribute__ ((packed));
 331
 332 /* FS_ACC IU and data unit for GID_PN nameserver request */
 333 struct ct_iu_gid_pn_resp {
 334         struct ct_hdr header;
 335         u32 d_id;
 336 } __attribute__ ((packed));
 337
 338 /**
 339  * struct zfcp_send_ct - used to pass parameters to function zfcp_fsf_send_ct
 340  * @wka_port: port where the request is sent to
 341  * @req: scatter-gather list for request
 342  * @resp: scatter-gather list for response
 343  * @req_count: number of elements in request scatter-gather list
 344  * @resp_count: number of elements in response scatter-gather list
 345  * @handler: handler function (called for response to the request)
 346  * @handler_data: data passed to handler function
 347  * @timeout: FSF timeout for this request
 348  * @completion: completion for synchronization purposes
 349  * @status: used to pass error status to calling function
 350  */
 351 struct zfcp_send_ct {
 352         struct zfcp_wka_port *wka_port;
 353         struct scatterlist *req;
 354         struct scatterlist *resp;
 355         unsigned int req_count;
 356         unsigned int resp_count;
 357         void (*handler)(unsigned long);
 358         unsigned long handler_data;
 359         int timeout;
 360         struct completion *completion;
 361         int status;
 362 };
 363
 364 /* used for name server requests in error recovery */
 365 struct zfcp_gid_pn_data {
 366         struct zfcp_send_ct ct;
 367         struct scatterlist req;
 368         struct scatterlist resp;
 369         struct ct_iu_gid_pn_req ct_iu_req;
 370         struct ct_iu_gid_pn_resp ct_iu_resp;
 371         struct zfcp_port *port;
 372 };
 373
 374 /**
 375  * struct zfcp_send_els - used to pass parameters to function zfcp_fsf_send_els
 376  * @adapter: adapter where request is sent from
 377  * @port: port where ELS is destinated (port reference count has to be increased)
 378  * @d_id: destiniation id of port where request is sent to
 379  * @req: scatter-gather list for request
 380  * @resp: scatter-gather list for response
 381  * @req_count: number of elements in request scatter-gather list
 382  * @resp_count: number of elements in response scatter-gather list
 383  * @handler: handler function (called for response to the request)
 384  * @handler_data: data passed to handler function
 385  * @completion: completion for synchronization purposes
 386  * @ls_code: hex code of ELS command
 387  * @status: used to pass error status to calling function
 388  */
 389 struct zfcp_send_els {
 390         struct zfcp_adapter *adapter;
 391         struct zfcp_port *port;
 392         u32 d_id;
 393         struct scatterlist *req;
 394         struct scatterlist *resp;
 395         unsigned int req_count;
 396         unsigned int resp_count;
 397         void (*handler)(unsigned long);
 398         unsigned long handler_data;
 399         struct completion *completion;
 400         int ls_code;
 401         int status;
 402 };
 403
 404 struct zfcp_wka_port {
 405         struct zfcp_adapter     *adapter;
 406         wait_queue_head_t       completion_wq;
 407         enum zfcp_wka_status    status;
 408         atomic_t                refcount;
 409         u32                     d_id;
 410         u32                     handle;
 411         struct mutex            mutex;
 412         struct delayed_work     work;
 413 };
 414
 415 struct zfcp_qdio_queue {
 416         struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q];
 417         u8                 first;       /* index of next free bfr in queue */
 418         atomic_t           count;       /* number of free buffers in queue */
 419 };
 420
 421 struct zfcp_erp_action {
 422         struct list_head list;
 423         int action;                   /* requested action code */
 424         struct zfcp_adapter *adapter; /* device which should be recovered */
 425         struct zfcp_port *port;
 426         struct zfcp_unit *unit;
 427         u32             status;       /* recovery status */
 428         u32 step;                     /* active step of this erp action */
 429         struct zfcp_fsf_req *fsf_req; /* fsf request currently pending
 430                                          for this action */
 431         struct timer_list timer;
 432 };
 433
 434 struct fsf_latency_record {
 435         u32 min;
 436         u32 max;
 437         u64 sum;
 438 };
 439
 440 struct latency_cont {
 441         struct fsf_latency_record channel;
 442         struct fsf_latency_record fabric;
 443         u64 counter;
 444 };
 445
 446 struct zfcp_latencies {
 447         struct latency_cont read;
 448         struct latency_cont write;
 449         struct latency_cont cmd;
 450         spinlock_t lock;
 451 };
 452
 453 struct zfcp_adapter {
 454         struct list_head        list;              /* list of adapters */
 455         atomic_t                refcount;          /* reference count */
 456         wait_queue_head_t       remove_wq;         /* can be used to wait for
 457                                                       refcount drop to zero */
 458         u64                     peer_wwnn;         /* P2P peer WWNN */
 459         u64                     peer_wwpn;         /* P2P peer WWPN */
 460         u32                     peer_d_id;         /* P2P peer D_ID */
 461         struct ccw_device       *ccw_device;       /* S/390 ccw device */
 462         u32                     hydra_version;     /* Hydra version */
 463         u32                     fsf_lic_version;
 464         u32                     adapter_features;  /* FCP channel features */
 465         u32                     connection_features; /* host connection features */
 466         u32                     hardware_version;  /* of FCP channel */
 467         u16                     timer_ticks;       /* time int for a tick */
 468         struct Scsi_Host        *scsi_host;        /* Pointer to mid-layer */
 469         struct list_head        port_list_head;    /* remote port list */
 470         unsigned long           req_no;            /* unique FSF req number */
 471         struct list_head        *req_list;         /* list of pending reqs */
 472         spinlock_t              req_list_lock;     /* request list lock */
 473         struct zfcp_qdio_queue  req_q;             /* request queue */
 474         spinlock_t              req_q_lock;        /* for operations on queue */
 475         int                     req_q_pci_batch;   /* SBALs since PCI indication
 476                                                       was last set */
 477         u32                     fsf_req_seq_no;    /* FSF cmnd seq number */
 478         wait_queue_head_t       request_wq;        /* can be used to wait for
 479                                                       more avaliable SBALs */
 480         struct zfcp_qdio_queue  resp_q;    /* response queue */
 481         rwlock_t                abort_lock;        /* Protects against SCSI
 482                                                       stack abort/command
 483                                                       completion races */
 484         atomic_t                stat_miss;         /* # missing status reads*/
 485         struct work_struct      stat_work;
 486         atomic_t                status;            /* status of this adapter */
 487         struct list_head        erp_ready_head;    /* error recovery for this
 488                                                       adapter/devices */
 489         struct list_head        erp_running_head;
 490         rwlock_t                erp_lock;
 491         struct semaphore        erp_ready_sem;
 492         wait_queue_head_t       erp_thread_wqh;
 493         wait_queue_head_t       erp_done_wqh;
 494         struct zfcp_erp_action  erp_action;        /* pending error recovery */
 495         atomic_t                erp_counter;
 496         u32                     erp_total_count;   /* total nr of enqueued erp
 497                                                       actions */
 498         u32                     erp_low_mem_count; /* nr of erp actions waiting
 499                                                       for memory */
 500         struct zfcp_wka_port    nsp;               /* adapter's nameserver */
 501         debug_info_t            *rec_dbf;
 502         debug_info_t            *hba_dbf;
 503         debug_info_t            *san_dbf;          /* debug feature areas */
 504         debug_info_t            *scsi_dbf;
 505         spinlock_t              rec_dbf_lock;
 506         spinlock_t              hba_dbf_lock;
 507         spinlock_t              san_dbf_lock;
 508         spinlock_t              scsi_dbf_lock;
 509         struct zfcp_rec_dbf_record      rec_dbf_buf;
 510         struct zfcp_hba_dbf_record      hba_dbf_buf;
 511         struct zfcp_san_dbf_record      san_dbf_buf;
 512         struct zfcp_scsi_dbf_record     scsi_dbf_buf;
 513         struct zfcp_adapter_mempool     pool;      /* Adapter memory pools */
 514         struct qdio_initialize  qdio_init_data;    /* for qdio_establish */
 515         struct fc_host_statistics *fc_stats;
 516         struct fsf_qtcb_bottom_port *stats_reset_data;
 517         unsigned long           stats_reset;
 518         struct work_struct      scan_work;
 519         struct service_level    service_level;
 520         atomic_t                qdio_outb_full;    /* queue full incidents */
 521 };
 522
 523 struct zfcp_port {
 524         struct device          sysfs_device;   /* sysfs device */
 525         struct fc_rport        *rport;         /* rport of fc transport class */
 526         struct list_head       list;           /* list of remote ports */
 527         atomic_t               refcount;       /* reference count */
 528         wait_queue_head_t      remove_wq;      /* can be used to wait for
 529                                                   refcount drop to zero */
 530         struct zfcp_adapter    *adapter;       /* adapter used to access port */
 531         struct list_head       unit_list_head; /* head of logical unit list */
 532         atomic_t               status;         /* status of this remote port */
 533         u64                    wwnn;           /* WWNN if known */
 534         u64                    wwpn;           /* WWPN */
 535         u32                    d_id;           /* D_ID */
 536         u32                    handle;         /* handle assigned by FSF */
 537         struct zfcp_erp_action erp_action;     /* pending error recovery */
 538         atomic_t               erp_counter;
 539         u32                    maxframe_size;
 540         u32                    supported_classes;
 541         struct work_struct     gid_pn_work;
 542 };
 543
 544 struct zfcp_unit {
 545         struct device          sysfs_device;   /* sysfs device */
 546         struct list_head       list;           /* list of logical units */
 547         atomic_t               refcount;       /* reference count */
 548         wait_queue_head_t      remove_wq;      /* can be used to wait for
 549                                                   refcount drop to zero */
 550         struct zfcp_port       *port;          /* remote port of unit */
 551         atomic_t               status;         /* status of this logical unit */
 552         u64                    fcp_lun;        /* own FCP_LUN */
 553         u32                    handle;         /* handle assigned by FSF */
 554         struct scsi_device     *device;        /* scsi device struct pointer */
 555         struct zfcp_erp_action erp_action;     /* pending error recovery */
 556         atomic_t               erp_counter;
 557         struct zfcp_latencies   latencies;
 558 };
 559
 560 /* FSF request */
 561 struct zfcp_fsf_req {
 562         struct list_head       list;           /* list of FSF requests */
 563         unsigned long          req_id;         /* unique request ID */
 564         struct zfcp_adapter    *adapter;       /* adapter request belongs to */
 565         u8                     sbal_number;    /* nr of SBALs free for use */
 566         u8                     sbal_first;     /* first SBAL for this request */
 567         u8                     sbal_last;      /* last SBAL for this request */
 568         u8                     sbal_limit;      /* last possible SBAL for
 569                                                   this reuest */
 570         u8                     sbale_curr;     /* current SBALE during creation
 571                                                   of request */
 572         u8                      sbal_response;  /* SBAL used in interrupt */
 573         wait_queue_head_t      completion_wq;  /* can be used by a routine
 574                                                   to wait for completion */
 575         u32                     status;        /* status of this request */
 576         u32                    fsf_command;    /* FSF Command copy */
 577         struct fsf_qtcb        *qtcb;          /* address of associated QTCB */
 578         u32                    seq_no;         /* Sequence number of request */
 579         void                    *data;           /* private data of request */
 580         struct timer_list     timer;           /* used for erp or scsi er */
 581         struct zfcp_erp_action *erp_action;    /* used if this request is
 582                                                   issued on behalf of erp */
 583         mempool_t              *pool;          /* used if request was alloacted
 584                                                   from emergency pool */
 585         unsigned long long     issued;         /* request sent time (STCK) */
 586         struct zfcp_unit       *unit;
 587         void                    (*handler)(struct zfcp_fsf_req *);
 588         u16                     qdio_outb_usage;/* usage of outbound queue */
 589         u16                     qdio_inb_usage; /* usage of inbound queue */
 590 };
 591
 592 /* driver data */
 593 struct zfcp_data {
 594         struct scsi_host_template scsi_host_template;
 595         struct scsi_transport_template *scsi_transport_template;
 596         struct list_head        adapter_list_head;  /* head of adapter list */
 597         rwlock_t                config_lock;        /* serialises changes
 598                                                        to adapter/port/unit
 599                                                        lists */
 600         struct semaphore        config_sema;        /* serialises configuration
 601                                                        changes */
 602         atomic_t                loglevel;            /* current loglevel */
 603         char                    init_busid[20];
 604         u64                     init_wwpn;
 605         u64                     init_fcp_lun;
 606         struct kmem_cache       *fsf_req_qtcb_cache;
 607         struct kmem_cache       *sr_buffer_cache;
 608         struct kmem_cache       *gid_pn_cache;
 609         struct workqueue_struct *work_queue;
 610 };
 611
 612 /* struct used by memory pools for fsf_requests */
 613 struct zfcp_fsf_req_qtcb {
 614         struct zfcp_fsf_req fsf_req;
 615         struct fsf_qtcb qtcb;
 616 };
 617
 618 /********************** ZFCP SPECIFIC DEFINES ********************************/
 619
 620 #define ZFCP_REQ_AUTO_CLEANUP   0x00000002
 621 #define ZFCP_REQ_NO_QTCB        0x00000008
 622
 623 #define ZFCP_SET                0x00000100
 624 #define ZFCP_CLEAR              0x00000200
 625
 626 #define zfcp_get_busid_by_adapter(adapter) (dev_name(&adapter->ccw_device->dev))
 627
 628 /*
 629  * Helper functions for request ID management.
 630  */
 631 static inline int zfcp_reqlist_hash(unsigned long req_id)
 632 {
 633         return req_id % REQUEST_LIST_SIZE;
 634 }
 635
 636 static inline void zfcp_reqlist_remove(struct zfcp_adapter *adapter,
 637                                        struct zfcp_fsf_req *fsf_req)
 638 {
 639         list_del(&fsf_req->list);
 640 }
 641
 642 static inline struct zfcp_fsf_req *
 643 zfcp_reqlist_find(struct zfcp_adapter *adapter, unsigned long req_id)
 644 {
 645         struct zfcp_fsf_req *request;
 646         unsigned int idx;
 647
 648         idx = zfcp_reqlist_hash(req_id);
 649         list_for_each_entry(request, &adapter->req_list[idx], list)
 650                 if (request->req_id == req_id)
 651                         return request;
 652         return NULL;
 653 }
 654
 655 static inline struct zfcp_fsf_req *
 656 zfcp_reqlist_find_safe(struct zfcp_adapter *adapter, struct zfcp_fsf_req *req)
 657 {
 658         struct zfcp_fsf_req *request;
 659         unsigned int idx;
 660
 661         for (idx = 0; idx < REQUEST_LIST_SIZE; idx++) {
 662                 list_for_each_entry(request, &adapter->req_list[idx], list)
 663                         if (request == req)
 664                                 return request;
 665         }
 666         return NULL;
 667 }
 668
 669 /*
 670  *  functions needed for reference/usage counting
 671  */
 672
 673 static inline void
 674 zfcp_unit_get(struct zfcp_unit *unit)
 675 {
 676         atomic_inc(&unit->refcount);
 677 }
 678
 679 static inline void
 680 zfcp_unit_put(struct zfcp_unit *unit)
 681 {
 682         if (atomic_dec_return(&unit->refcount) == 0)
 683                 wake_up(&unit->remove_wq);
 684 }
 685
 686 static inline void
 687 zfcp_port_get(struct zfcp_port *port)
 688 {
 689         atomic_inc(&port->refcount);
 690 }
 691
 692 static inline void
 693 zfcp_port_put(struct zfcp_port *port)
 694 {
 695         if (atomic_dec_return(&port->refcount) == 0)
 696                 wake_up(&port->remove_wq);
 697 }
 698
 699 static inline void
 700 zfcp_adapter_get(struct zfcp_adapter *adapter)
 701 {
 702         atomic_inc(&adapter->refcount);
 703 }
 704
 705 static inline void
 706 zfcp_adapter_put(struct zfcp_adapter *adapter)
 707 {
 708         if (atomic_dec_return(&adapter->refcount) == 0)
 709                 wake_up(&adapter->remove_wq);
 710 }
 711
 712 #endif /* ZFCP_DEF_H */