drivers/s390/scsi/zfcp_def.h

   1 /*
   2  * zfcp device driver
   3  *
   4  * Global definitions for the zfcp device driver.
   5  *
   6  * Copyright IBM Corp. 2002, 2010
   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/debug.h>
  37 #include <asm/ebcdic.h>
  38 #include <asm/sysinfo.h>
  39 #include "zfcp_fsf.h"
  40 #include "zfcp_fc.h"
  41 #include "zfcp_qdio.h"
  42
  43 struct zfcp_reqlist;
  44
  45 /********************* SCSI SPECIFIC DEFINES *********************************/
  46 #define ZFCP_SCSI_ER_TIMEOUT                    (10*HZ)
  47
  48 /********************* FSF SPECIFIC DEFINES *********************************/
  49
  50 /* ATTENTION: value must not be used by hardware */
  51 #define FSF_QTCB_UNSOLICITED_STATUS             0x6305
  52
  53 /* timeout value for "default timer" for fsf requests */
  54 #define ZFCP_FSF_REQUEST_TIMEOUT (60*HZ)
  55
  56 /*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/
  57
  58 /*
  59  * Note, the leftmost status byte is common among adapter, port
  60  * and unit
  61  */
  62 #define ZFCP_COMMON_FLAGS                       0xfff00000
  63
  64 /* common status bits */
  65 #define ZFCP_STATUS_COMMON_RUNNING              0x40000000
  66 #define ZFCP_STATUS_COMMON_ERP_FAILED           0x20000000
  67 #define ZFCP_STATUS_COMMON_UNBLOCKED            0x10000000
  68 #define ZFCP_STATUS_COMMON_OPEN                 0x04000000
  69 #define ZFCP_STATUS_COMMON_ERP_INUSE            0x01000000
  70 #define ZFCP_STATUS_COMMON_ACCESS_DENIED        0x00800000
  71 #define ZFCP_STATUS_COMMON_ACCESS_BOXED         0x00400000
  72 #define ZFCP_STATUS_COMMON_NOESC                0x00200000
  73
  74 /* adapter status */
  75 #define ZFCP_STATUS_ADAPTER_MB_ACT              0x00000001
  76 #define ZFCP_STATUS_ADAPTER_QDIOUP              0x00000002
  77 #define ZFCP_STATUS_ADAPTER_SIOSL_ISSUED        0x00000004
  78 #define ZFCP_STATUS_ADAPTER_XCONFIG_OK          0x00000008
  79 #define ZFCP_STATUS_ADAPTER_HOST_CON_INIT       0x00000010
  80 #define ZFCP_STATUS_ADAPTER_SUSPENDED           0x00000040
  81 #define ZFCP_STATUS_ADAPTER_ERP_PENDING         0x00000100
  82 #define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED      0x00000200
  83 #define ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED    0x00000400
  84
  85 /* remote port status */
  86 #define ZFCP_STATUS_PORT_PHYS_OPEN              0x00000001
  87 #define ZFCP_STATUS_PORT_LINK_TEST              0x00000002
  88
  89 /* FSF request status (this does not have a common part) */
  90 #define ZFCP_STATUS_FSFREQ_ERROR                0x00000008
  91 #define ZFCP_STATUS_FSFREQ_CLEANUP              0x00000010
  92 #define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED       0x00000040
  93 #define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED       0x00000080
  94 #define ZFCP_STATUS_FSFREQ_TMFUNCFAILED         0x00000200
  95 #define ZFCP_STATUS_FSFREQ_DISMISSED            0x00001000
  96
  97 /************************* STRUCTURE DEFINITIONS *****************************/
  98
  99 struct zfcp_fsf_req;
 100
 101 /* holds various memory pools of an adapter */
 102 struct zfcp_adapter_mempool {
 103         mempool_t *erp_req;
 104         mempool_t *gid_pn_req;
 105         mempool_t *scsi_req;
 106         mempool_t *scsi_abort;
 107         mempool_t *status_read_req;
 108         mempool_t *sr_data;
 109         mempool_t *gid_pn;
 110         mempool_t *qtcb_pool;
 111 };
 112
 113 struct zfcp_erp_action {
 114         struct list_head list;
 115         int action;                   /* requested action code */
 116         struct zfcp_adapter *adapter; /* device which should be recovered */
 117         struct zfcp_port *port;
 118         struct scsi_device *sdev;
 119         u32             status;       /* recovery status */
 120         u32 step;                     /* active step of this erp action */
 121         unsigned long           fsf_req_id;
 122         struct timer_list timer;
 123 };
 124
 125 struct fsf_latency_record {
 126         u32 min;
 127         u32 max;
 128         u64 sum;
 129 };
 130
 131 struct latency_cont {
 132         struct fsf_latency_record channel;
 133         struct fsf_latency_record fabric;
 134         u64 counter;
 135 };
 136
 137 struct zfcp_latencies {
 138         struct latency_cont read;
 139         struct latency_cont write;
 140         struct latency_cont cmd;
 141         spinlock_t lock;
 142 };
 143
 144 struct zfcp_adapter {
 145         struct kref             ref;
 146         u64                     peer_wwnn;         /* P2P peer WWNN */
 147         u64                     peer_wwpn;         /* P2P peer WWPN */
 148         u32                     peer_d_id;         /* P2P peer D_ID */
 149         struct ccw_device       *ccw_device;       /* S/390 ccw device */
 150         struct zfcp_qdio        *qdio;
 151         u32                     hydra_version;     /* Hydra version */
 152         u32                     fsf_lic_version;
 153         u32                     adapter_features;  /* FCP channel features */
 154         u32                     connection_features; /* host connection features */
 155         u32                     hardware_version;  /* of FCP channel */
 156         u16                     timer_ticks;       /* time int for a tick */
 157         struct Scsi_Host        *scsi_host;        /* Pointer to mid-layer */
 158         struct list_head        port_list;         /* remote port list */
 159         rwlock_t                port_list_lock;    /* port list lock */
 160         unsigned long           req_no;            /* unique FSF req number */
 161         struct zfcp_reqlist     *req_list;
 162         u32                     fsf_req_seq_no;    /* FSF cmnd seq number */
 163         rwlock_t                abort_lock;        /* Protects against SCSI
 164                                                       stack abort/command
 165                                                       completion races */
 166         atomic_t                stat_miss;         /* # missing status reads*/
 167         unsigned int            stat_read_buf_num;
 168         struct work_struct      stat_work;
 169         atomic_t                status;            /* status of this adapter */
 170         struct list_head        erp_ready_head;    /* error recovery for this
 171                                                       adapter/devices */
 172         wait_queue_head_t       erp_ready_wq;
 173         struct list_head        erp_running_head;
 174         rwlock_t                erp_lock;
 175         wait_queue_head_t       erp_done_wqh;
 176         struct zfcp_erp_action  erp_action;        /* pending error recovery */
 177         atomic_t                erp_counter;
 178         u32                     erp_total_count;   /* total nr of enqueued erp
 179                                                       actions */
 180         u32                     erp_low_mem_count; /* nr of erp actions waiting
 181                                                       for memory */
 182         struct task_struct      *erp_thread;
 183         struct zfcp_fc_wka_ports *gs;              /* generic services */
 184         struct zfcp_dbf         *dbf;              /* debug traces */
 185         struct zfcp_adapter_mempool     pool;      /* Adapter memory pools */
 186         struct fc_host_statistics *fc_stats;
 187         struct fsf_qtcb_bottom_port *stats_reset_data;
 188         unsigned long           stats_reset;
 189         struct work_struct      scan_work;
 190         struct work_struct      ns_up_work;
 191         struct service_level    service_level;
 192         struct workqueue_struct *work_queue;
 193         struct device_dma_parameters dma_parms;
 194         struct zfcp_fc_events events;
 195 };
 196
 197 struct zfcp_port {
 198         struct device          dev;
 199         struct fc_rport        *rport;         /* rport of fc transport class */
 200         struct list_head       list;           /* list of remote ports */
 201         struct zfcp_adapter    *adapter;       /* adapter used to access port */
 202         struct list_head        unit_list;      /* head of logical unit list */
 203         rwlock_t                unit_list_lock; /* unit list lock */
 204         atomic_t                units;         /* zfcp_unit count */
 205         atomic_t               status;         /* status of this remote port */
 206         u64                    wwnn;           /* WWNN if known */
 207         u64                    wwpn;           /* WWPN */
 208         u32                    d_id;           /* D_ID */
 209         u32                    handle;         /* handle assigned by FSF */
 210         struct zfcp_erp_action erp_action;     /* pending error recovery */
 211         atomic_t               erp_counter;
 212         u32                    maxframe_size;
 213         u32                    supported_classes;
 214         struct work_struct     gid_pn_work;
 215         struct work_struct     test_link_work;
 216         struct work_struct     rport_work;
 217         enum { RPORT_NONE, RPORT_ADD, RPORT_DEL }  rport_task;
 218         unsigned int            starget_id;
 219 };
 220
 221 /**
 222  * struct zfcp_unit - LUN configured via zfcp sysfs
 223  * @dev: struct device for sysfs representation and reference counting
 224  * @list: entry in LUN/unit list per zfcp_port
 225  * @port: reference to zfcp_port where this LUN is configured
 226  * @fcp_lun: 64 bit LUN value
 227  * @scsi_work: for running scsi_scan_target
 228  *
 229  * This is the representation of a LUN that has been configured for
 230  * usage. The main data here is the 64 bit LUN value, data for
 231  * running I/O and recovery is in struct zfcp_scsi_dev.
 232  */
 233 struct zfcp_unit {
 234         struct device           dev;
 235         struct list_head        list;
 236         struct zfcp_port        *port;
 237         u64                     fcp_lun;
 238         struct work_struct      scsi_work;
 239 };
 240
 241 /**
 242  * struct zfcp_scsi_dev - zfcp data per SCSI device
 243  * @status: zfcp internal status flags
 244  * @lun_handle: handle from "open lun" for issuing FSF requests
 245  * @erp_action: zfcp erp data for opening and recovering this LUN
 246  * @erp_counter: zfcp erp counter for this LUN
 247  * @latencies: FSF channel and fabric latencies
 248  * @port: zfcp_port where this LUN belongs to
 249  */
 250 struct zfcp_scsi_dev {
 251         atomic_t                status;
 252         u32                     lun_handle;
 253         struct zfcp_erp_action  erp_action;
 254         atomic_t                erp_counter;
 255         struct zfcp_latencies   latencies;
 256         struct zfcp_port        *port;
 257 };
 258
 259 /**
 260  * sdev_to_zfcp - Access zfcp LUN data for SCSI device
 261  * @sdev: scsi_device where to get the zfcp_scsi_dev pointer
 262  */
 263 static inline struct zfcp_scsi_dev *sdev_to_zfcp(struct scsi_device *sdev)
 264 {
 265         return scsi_transport_device_data(sdev);
 266 }
 267
 268 /**
 269  * zfcp_scsi_dev_lun - Return SCSI device LUN as 64 bit FCP LUN
 270  * @sdev: SCSI device where to get the LUN from
 271  */
 272 static inline u64 zfcp_scsi_dev_lun(struct scsi_device *sdev)
 273 {
 274         u64 fcp_lun;
 275
 276         int_to_scsilun(sdev->lun, (struct scsi_lun *)&fcp_lun);
 277         return fcp_lun;
 278 }
 279
 280 /**
 281  * struct zfcp_fsf_req - basic FSF request structure
 282  * @list: list of FSF requests
 283  * @req_id: unique request ID
 284  * @adapter: adapter this request belongs to
 285  * @qdio_req: qdio queue related values
 286  * @completion: used to signal the completion of the request
 287  * @status: status of the request
 288  * @fsf_command: FSF command issued
 289  * @qtcb: associated QTCB
 290  * @seq_no: sequence number of this request
 291  * @data: private data
 292  * @timer: timer data of this request
 293  * @erp_action: reference to erp action if request issued on behalf of ERP
 294  * @pool: reference to memory pool if used for this request
 295  * @issued: time when request was send (STCK)
 296  * @handler: handler which should be called to process response
 297  */
 298 struct zfcp_fsf_req {
 299         struct list_head        list;
 300         unsigned long           req_id;
 301         struct zfcp_adapter     *adapter;
 302         struct zfcp_qdio_req    qdio_req;
 303         struct completion       completion;
 304         u32                     status;
 305         u32                     fsf_command;
 306         struct fsf_qtcb         *qtcb;
 307         u32                     seq_no;
 308         void                    *data;
 309         struct timer_list       timer;
 310         struct zfcp_erp_action  *erp_action;
 311         mempool_t               *pool;
 312         unsigned long long      issued;
 313         void                    (*handler)(struct zfcp_fsf_req *);
 314 };
 315
 316 static inline
 317 int zfcp_adapter_multi_buffer_active(struct zfcp_adapter *adapter)
 318 {
 319         return atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_MB_ACT;
 320 }
 321
 322 #endif /* ZFCP_DEF_H */