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, 2009
   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/fc/fc_fs.h>
  26 #include <scsi/fc/fc_gs.h>
  27 #include <scsi/scsi.h>
  28 #include <scsi/scsi_tcq.h>
  29 #include <scsi/scsi_cmnd.h>
  30 #include <scsi/scsi_device.h>
  31 #include <scsi/scsi_host.h>
  32 #include <scsi/scsi_transport.h>
  33 #include <scsi/scsi_transport_fc.h>
  34 #include <scsi/scsi_bsg_fc.h>
  35 #include <asm/ccwdev.h>
  36 #include <asm/qdio.h>
  37 #include <asm/debug.h>
  38 #include <asm/ebcdic.h>
  39 #include <asm/sysinfo.h>
  40 #include "zfcp_fsf.h"
  41
  42 /********************* GENERAL DEFINES *********************************/
  43
  44 #define REQUEST_LIST_SIZE 128
  45
  46 /********************* SCSI SPECIFIC DEFINES *********************************/
  47 #define ZFCP_SCSI_ER_TIMEOUT                    (10*HZ)
  48
  49 /********************* CIO/QDIO SPECIFIC DEFINES *****************************/
  50
  51 /* DMQ bug workaround: don't use last SBALE */
  52 #define ZFCP_MAX_SBALES_PER_SBAL        (QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
  53
  54 /* index of last SBALE (with respect to DMQ bug workaround) */
  55 #define ZFCP_LAST_SBALE_PER_SBAL        (ZFCP_MAX_SBALES_PER_SBAL - 1)
  56
  57 /* max. number of (data buffer) SBALEs in largest SBAL chain */
  58 #define ZFCP_MAX_SBALES_PER_REQ         \
  59         (FSF_MAX_SBALS_PER_REQ * ZFCP_MAX_SBALES_PER_SBAL - 2)
  60         /* request ID + QTCB in SBALE 0 + 1 of first SBAL in chain */
  61
  62 #define ZFCP_MAX_SECTORS (ZFCP_MAX_SBALES_PER_REQ * 8)
  63         /* max. number of (data buffer) SBALEs in largest SBAL chain
  64            multiplied with number of sectors per 4k block */
  65
  66 /********************* FSF SPECIFIC DEFINES *********************************/
  67
  68 /* ATTENTION: value must not be used by hardware */
  69 #define FSF_QTCB_UNSOLICITED_STATUS             0x6305
  70
  71 /* timeout value for "default timer" for fsf requests */
  72 #define ZFCP_FSF_REQUEST_TIMEOUT (60*HZ)
  73
  74 /*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/
  75
  76 /*
  77  * Note, the leftmost status byte is common among adapter, port
  78  * and unit
  79  */
  80 #define ZFCP_COMMON_FLAGS                       0xfff00000
  81
  82 /* common status bits */
  83 #define ZFCP_STATUS_COMMON_RUNNING              0x40000000
  84 #define ZFCP_STATUS_COMMON_ERP_FAILED           0x20000000
  85 #define ZFCP_STATUS_COMMON_UNBLOCKED            0x10000000
  86 #define ZFCP_STATUS_COMMON_OPEN                 0x04000000
  87 #define ZFCP_STATUS_COMMON_ERP_INUSE            0x01000000
  88 #define ZFCP_STATUS_COMMON_ACCESS_DENIED        0x00800000
  89 #define ZFCP_STATUS_COMMON_ACCESS_BOXED         0x00400000
  90 #define ZFCP_STATUS_COMMON_NOESC                0x00200000
  91
  92 /* adapter status */
  93 #define ZFCP_STATUS_ADAPTER_QDIOUP              0x00000002
  94 #define ZFCP_STATUS_ADAPTER_XCONFIG_OK          0x00000008
  95 #define ZFCP_STATUS_ADAPTER_HOST_CON_INIT       0x00000010
  96 #define ZFCP_STATUS_ADAPTER_ERP_PENDING         0x00000100
  97 #define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED      0x00000200
  98
  99 /* remote port status */
 100 #define ZFCP_STATUS_PORT_PHYS_OPEN              0x00000001
 101 #define ZFCP_STATUS_PORT_LINK_TEST              0x00000002
 102
 103 /* logical unit status */
 104 #define ZFCP_STATUS_UNIT_SHARED                 0x00000004
 105 #define ZFCP_STATUS_UNIT_READONLY               0x00000008
 106
 107 /* FSF request status (this does not have a common part) */
 108 #define ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT      0x00000002
 109 #define ZFCP_STATUS_FSFREQ_ERROR                0x00000008
 110 #define ZFCP_STATUS_FSFREQ_CLEANUP              0x00000010
 111 #define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED       0x00000040
 112 #define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED       0x00000080
 113 #define ZFCP_STATUS_FSFREQ_TMFUNCFAILED         0x00000200
 114 #define ZFCP_STATUS_FSFREQ_DISMISSED            0x00001000
 115
 116 /************************* STRUCTURE DEFINITIONS *****************************/
 117
 118 struct zfcp_fsf_req;
 119
 120 /* holds various memory pools of an adapter */
 121 struct zfcp_adapter_mempool {
 122         mempool_t *erp_req;
 123         mempool_t *gid_pn_req;
 124         mempool_t *scsi_req;
 125         mempool_t *scsi_abort;
 126         mempool_t *status_read_req;
 127         mempool_t *status_read_data;
 128         mempool_t *gid_pn;
 129         mempool_t *qtcb_pool;
 130 };
 131
 132 struct zfcp_qdio_queue {
 133         struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q];
 134         u8                 first;       /* index of next free bfr in queue */
 135         atomic_t           count;       /* number of free buffers in queue */
 136 };
 137
 138 struct zfcp_erp_action {
 139         struct list_head list;
 140         int action;                   /* requested action code */
 141         struct zfcp_adapter *adapter; /* device which should be recovered */
 142         struct zfcp_port *port;
 143         struct zfcp_unit *unit;
 144         u32             status;       /* recovery status */
 145         u32 step;                     /* active step of this erp action */
 146         struct zfcp_fsf_req *fsf_req; /* fsf request currently pending
 147                                          for this action */
 148         struct timer_list timer;
 149 };
 150
 151 struct fsf_latency_record {
 152         u32 min;
 153         u32 max;
 154         u64 sum;
 155 };
 156
 157 struct latency_cont {
 158         struct fsf_latency_record channel;
 159         struct fsf_latency_record fabric;
 160         u64 counter;
 161 };
 162
 163 struct zfcp_latencies {
 164         struct latency_cont read;
 165         struct latency_cont write;
 166         struct latency_cont cmd;
 167         spinlock_t lock;
 168 };
 169
 170 /** struct zfcp_qdio - basic QDIO data structure
 171  * @resp_q: response queue
 172  * @req_q: request queue
 173  * @stat_lock: lock to protect req_q_util and req_q_time
 174  * @req_q_lock; lock to serialize access to request queue
 175  * @req_q_time: time of last fill level change
 176  * @req_q_util: used for accounting
 177  * @req_q_full: queue full incidents
 178  * @req_q_wq: used to wait for SBAL availability
 179  * @adapter: adapter used in conjunction with this QDIO structure
 180  */
 181 struct zfcp_qdio {
 182         struct zfcp_qdio_queue  resp_q;
 183         struct zfcp_qdio_queue  req_q;
 184         spinlock_t              stat_lock;
 185         spinlock_t              req_q_lock;
 186         unsigned long long      req_q_time;
 187         u64                     req_q_util;
 188         atomic_t                req_q_full;
 189         wait_queue_head_t       req_q_wq;
 190         struct zfcp_adapter     *adapter;
 191 };
 192
 193 struct zfcp_adapter {
 194         struct kref             ref;
 195         u64                     peer_wwnn;         /* P2P peer WWNN */
 196         u64                     peer_wwpn;         /* P2P peer WWPN */
 197         u32                     peer_d_id;         /* P2P peer D_ID */
 198         struct ccw_device       *ccw_device;       /* S/390 ccw device */
 199         struct zfcp_qdio        *qdio;
 200         u32                     hydra_version;     /* Hydra version */
 201         u32                     fsf_lic_version;
 202         u32                     adapter_features;  /* FCP channel features */
 203         u32                     connection_features; /* host connection features */
 204         u32                     hardware_version;  /* of FCP channel */
 205         u16                     timer_ticks;       /* time int for a tick */
 206         struct Scsi_Host        *scsi_host;        /* Pointer to mid-layer */
 207         struct list_head        port_list;         /* remote port list */
 208         rwlock_t                port_list_lock;    /* port list lock */
 209         unsigned long           req_no;            /* unique FSF req number */
 210         struct list_head        *req_list;         /* list of pending reqs */
 211         spinlock_t              req_list_lock;     /* request list lock */
 212         u32                     fsf_req_seq_no;    /* FSF cmnd seq number */
 213         rwlock_t                abort_lock;        /* Protects against SCSI
 214                                                       stack abort/command
 215                                                       completion races */
 216         atomic_t                stat_miss;         /* # missing status reads*/
 217         struct work_struct      stat_work;
 218         atomic_t                status;            /* status of this adapter */
 219         struct list_head        erp_ready_head;    /* error recovery for this
 220                                                       adapter/devices */
 221         wait_queue_head_t       erp_ready_wq;
 222         struct list_head        erp_running_head;
 223         rwlock_t                erp_lock;
 224         wait_queue_head_t       erp_done_wqh;
 225         struct zfcp_erp_action  erp_action;        /* pending error recovery */
 226         atomic_t                erp_counter;
 227         u32                     erp_total_count;   /* total nr of enqueued erp
 228                                                       actions */
 229         u32                     erp_low_mem_count; /* nr of erp actions waiting
 230                                                       for memory */
 231         struct task_struct      *erp_thread;
 232         struct zfcp_fc_wka_ports *gs;              /* generic services */
 233         struct zfcp_dbf         *dbf;              /* debug traces */
 234         struct zfcp_adapter_mempool     pool;      /* Adapter memory pools */
 235         struct fc_host_statistics *fc_stats;
 236         struct fsf_qtcb_bottom_port *stats_reset_data;
 237         unsigned long           stats_reset;
 238         struct work_struct      scan_work;
 239         struct service_level    service_level;
 240         struct workqueue_struct *work_queue;
 241 };
 242
 243 struct zfcp_port {
 244         struct device          sysfs_device;   /* sysfs device */
 245         struct fc_rport        *rport;         /* rport of fc transport class */
 246         struct list_head       list;           /* list of remote ports */
 247         struct zfcp_adapter    *adapter;       /* adapter used to access port */
 248         struct list_head        unit_list;      /* head of logical unit list */
 249         rwlock_t                unit_list_lock; /* unit list lock */
 250         atomic_t               status;         /* status of this remote port */
 251         u64                    wwnn;           /* WWNN if known */
 252         u64                    wwpn;           /* WWPN */
 253         u32                    d_id;           /* D_ID */
 254         u32                    handle;         /* handle assigned by FSF */
 255         struct zfcp_erp_action erp_action;     /* pending error recovery */
 256         atomic_t               erp_counter;
 257         u32                    maxframe_size;
 258         u32                    supported_classes;
 259         struct work_struct     gid_pn_work;
 260         struct work_struct     test_link_work;
 261         struct work_struct     rport_work;
 262         enum { RPORT_NONE, RPORT_ADD, RPORT_DEL }  rport_task;
 263 };
 264
 265 struct zfcp_unit {
 266         struct device          sysfs_device;   /* sysfs device */
 267         struct list_head       list;           /* list of logical units */
 268         struct zfcp_port       *port;          /* remote port of unit */
 269         atomic_t               status;         /* status of this logical unit */
 270         u64                    fcp_lun;        /* own FCP_LUN */
 271         u32                    handle;         /* handle assigned by FSF */
 272         struct scsi_device     *device;        /* scsi device struct pointer */
 273         struct zfcp_erp_action erp_action;     /* pending error recovery */
 274         atomic_t               erp_counter;
 275         struct zfcp_latencies   latencies;
 276         struct work_struct      scsi_work;
 277 };
 278
 279 /**
 280  * struct zfcp_queue_req - queue related values for a request
 281  * @sbal_number: number of free SBALs
 282  * @sbal_first: first SBAL for this request
 283  * @sbal_last: last SBAL for this request
 284  * @sbal_limit: last possible SBAL for this request
 285  * @sbale_curr: current SBALE at creation of this request
 286  * @sbal_response: SBAL used in interrupt
 287  * @qdio_outb_usage: usage of outbound queue
 288  * @qdio_inb_usage: usage of inbound queue
 289  */
 290 struct zfcp_queue_req {
 291         u8                     sbal_number;
 292         u8                     sbal_first;
 293         u8                     sbal_last;
 294         u8                     sbal_limit;
 295         u8                     sbale_curr;
 296         u8                     sbal_response;
 297         u16                    qdio_outb_usage;
 298         u16                    qdio_inb_usage;
 299 };
 300
 301 /**
 302  * struct zfcp_fsf_req - basic FSF request structure
 303  * @list: list of FSF requests
 304  * @req_id: unique request ID
 305  * @adapter: adapter this request belongs to
 306  * @queue_req: queue related values
 307  * @completion: used to signal the completion of the request
 308  * @status: status of the request
 309  * @fsf_command: FSF command issued
 310  * @qtcb: associated QTCB
 311  * @seq_no: sequence number of this request
 312  * @data: private data
 313  * @timer: timer data of this request
 314  * @erp_action: reference to erp action if request issued on behalf of ERP
 315  * @pool: reference to memory pool if used for this request
 316  * @issued: time when request was send (STCK)
 317  * @unit: reference to unit if this request is a SCSI request
 318  * @handler: handler which should be called to process response
 319  */
 320 struct zfcp_fsf_req {
 321         struct list_head        list;
 322         unsigned long           req_id;
 323         struct zfcp_adapter     *adapter;
 324         struct zfcp_queue_req   queue_req;
 325         struct completion       completion;
 326         u32                     status;
 327         u32                     fsf_command;
 328         struct fsf_qtcb         *qtcb;
 329         u32                     seq_no;
 330         void                    *data;
 331         struct timer_list       timer;
 332         struct zfcp_erp_action  *erp_action;
 333         mempool_t               *pool;
 334         unsigned long long      issued;
 335         struct zfcp_unit        *unit;
 336         void                    (*handler)(struct zfcp_fsf_req *);
 337 };
 338
 339 /* driver data */
 340 struct zfcp_data {
 341         struct scsi_host_template scsi_host_template;
 342         struct scsi_transport_template *scsi_transport_template;
 343         struct kmem_cache       *gpn_ft_cache;
 344         struct kmem_cache       *qtcb_cache;
 345         struct kmem_cache       *sr_buffer_cache;
 346         struct kmem_cache       *gid_pn_cache;
 347         struct kmem_cache       *adisc_cache;
 348 };
 349
 350 /********************** ZFCP SPECIFIC DEFINES ********************************/
 351
 352 #define ZFCP_SET                0x00000100
 353 #define ZFCP_CLEAR              0x00000200
 354
 355 /*
 356  * Helper functions for request ID management.
 357  */
 358 static inline int zfcp_reqlist_hash(unsigned long req_id)
 359 {
 360         return req_id % REQUEST_LIST_SIZE;
 361 }
 362
 363 static inline void zfcp_reqlist_remove(struct zfcp_adapter *adapter,
 364                                        struct zfcp_fsf_req *fsf_req)
 365 {
 366         list_del(&fsf_req->list);
 367 }
 368
 369 static inline struct zfcp_fsf_req *
 370 zfcp_reqlist_find(struct zfcp_adapter *adapter, unsigned long req_id)
 371 {
 372         struct zfcp_fsf_req *request;
 373         unsigned int idx;
 374
 375         idx = zfcp_reqlist_hash(req_id);
 376         list_for_each_entry(request, &adapter->req_list[idx], list)
 377                 if (request->req_id == req_id)
 378                         return request;
 379         return NULL;
 380 }
 381
 382 static inline struct zfcp_fsf_req *
 383 zfcp_reqlist_find_safe(struct zfcp_adapter *adapter, struct zfcp_fsf_req *req)
 384 {
 385         struct zfcp_fsf_req *request;
 386         unsigned int idx;
 387
 388         for (idx = 0; idx < REQUEST_LIST_SIZE; idx++) {
 389                 list_for_each_entry(request, &adapter->req_list[idx], list)
 390                         if (request == req)
 391                                 return request;
 392         }
 393         return NULL;
 394 }
 395
 396 #endif /* ZFCP_DEF_H */