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, 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_ERP_PENDING         0x00000100
  81 #define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED      0x00000200
  82 #define ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED    0x00000400
  83
  84 /* remote port status */
  85 #define ZFCP_STATUS_PORT_PHYS_OPEN              0x00000001
  86 #define ZFCP_STATUS_PORT_LINK_TEST              0x00000002
  87
  88 /* logical unit status */
  89 #define ZFCP_STATUS_LUN_SHARED                  0x00000004
  90 #define ZFCP_STATUS_LUN_READONLY                0x00000008
  91
  92 /* FSF request status (this does not have a common part) */
  93 #define ZFCP_STATUS_FSFREQ_ERROR                0x00000008
  94 #define ZFCP_STATUS_FSFREQ_CLEANUP              0x00000010
  95 #define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED       0x00000040
  96 #define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED       0x00000080
  97 #define ZFCP_STATUS_FSFREQ_TMFUNCFAILED         0x00000200
  98 #define ZFCP_STATUS_FSFREQ_DISMISSED            0x00001000
  99
 100 /************************* STRUCTURE DEFINITIONS *****************************/
 101
 102 struct zfcp_fsf_req;
 103
 104 /* holds various memory pools of an adapter */
 105 struct zfcp_adapter_mempool {
 106         mempool_t *erp_req;
 107         mempool_t *gid_pn_req;
 108         mempool_t *scsi_req;
 109         mempool_t *scsi_abort;
 110         mempool_t *status_read_req;
 111         mempool_t *sr_data;
 112         mempool_t *gid_pn;
 113         mempool_t *qtcb_pool;
 114 };
 115
 116 struct zfcp_erp_action {
 117         struct list_head list;
 118         int action;                   /* requested action code */
 119         struct zfcp_adapter *adapter; /* device which should be recovered */
 120         struct zfcp_port *port;
 121         struct scsi_device *sdev;
 122         u32             status;       /* recovery status */
 123         u32 step;                     /* active step of this erp action */
 124         unsigned long           fsf_req_id;
 125         struct timer_list timer;
 126 };
 127
 128 struct fsf_latency_record {
 129         u32 min;
 130         u32 max;
 131         u64 sum;
 132 };
 133
 134 struct latency_cont {
 135         struct fsf_latency_record channel;
 136         struct fsf_latency_record fabric;
 137         u64 counter;
 138 };
 139
 140 struct zfcp_latencies {
 141         struct latency_cont read;
 142         struct latency_cont write;
 143         struct latency_cont cmd;
 144         spinlock_t lock;
 145 };
 146
 147 struct zfcp_adapter {
 148         struct kref             ref;
 149         u64                     peer_wwnn;         /* P2P peer WWNN */
 150         u64                     peer_wwpn;         /* P2P peer WWPN */
 151         u32                     peer_d_id;         /* P2P peer D_ID */
 152         struct ccw_device       *ccw_device;       /* S/390 ccw device */
 153         struct zfcp_qdio        *qdio;
 154         u32                     hydra_version;     /* Hydra version */
 155         u32                     fsf_lic_version;
 156         u32                     adapter_features;  /* FCP channel features */
 157         u32                     connection_features; /* host connection features */
 158         u32                     hardware_version;  /* of FCP channel */
 159         u16                     timer_ticks;       /* time int for a tick */
 160         struct Scsi_Host        *scsi_host;        /* Pointer to mid-layer */
 161         struct list_head        port_list;         /* remote port list */
 162         rwlock_t                port_list_lock;    /* port list lock */
 163         unsigned long           req_no;            /* unique FSF req number */
 164         struct zfcp_reqlist     *req_list;
 165         u32                     fsf_req_seq_no;    /* FSF cmnd seq number */
 166         rwlock_t                abort_lock;        /* Protects against SCSI
 167                                                       stack abort/command
 168                                                       completion races */
 169         atomic_t                stat_miss;         /* # missing status reads*/
 170         unsigned int            stat_read_buf_num;
 171         struct work_struct      stat_work;
 172         atomic_t                status;            /* status of this adapter */
 173         struct list_head        erp_ready_head;    /* error recovery for this
 174                                                       adapter/devices */
 175         wait_queue_head_t       erp_ready_wq;
 176         struct list_head        erp_running_head;
 177         rwlock_t                erp_lock;
 178         wait_queue_head_t       erp_done_wqh;
 179         struct zfcp_erp_action  erp_action;        /* pending error recovery */
 180         atomic_t                erp_counter;
 181         u32                     erp_total_count;   /* total nr of enqueued erp
 182                                                       actions */
 183         u32                     erp_low_mem_count; /* nr of erp actions waiting
 184                                                       for memory */
 185         struct task_struct      *erp_thread;
 186         struct zfcp_fc_wka_ports *gs;              /* generic services */
 187         struct zfcp_dbf         *dbf;              /* debug traces */
 188         struct zfcp_adapter_mempool     pool;      /* Adapter memory pools */
 189         struct fc_host_statistics *fc_stats;
 190         struct fsf_qtcb_bottom_port *stats_reset_data;
 191         unsigned long           stats_reset;
 192         struct work_struct      scan_work;
 193         struct work_struct      ns_up_work;
 194         struct service_level    service_level;
 195         struct workqueue_struct *work_queue;
 196         struct device_dma_parameters dma_parms;
 197         struct zfcp_fc_events events;
 198 };
 199
 200 struct zfcp_port {
 201         struct device          dev;
 202         struct fc_rport        *rport;         /* rport of fc transport class */
 203         struct list_head       list;           /* list of remote ports */
 204         struct zfcp_adapter    *adapter;       /* adapter used to access port */
 205         struct list_head        unit_list;      /* head of logical unit list */
 206         rwlock_t                unit_list_lock; /* unit list lock */
 207         atomic_t               status;         /* status of this remote port */
 208         u64                    wwnn;           /* WWNN if known */
 209         u64                    wwpn;           /* WWPN */
 210         u32                    d_id;           /* D_ID */
 211         u32                    handle;         /* handle assigned by FSF */
 212         struct zfcp_erp_action erp_action;     /* pending error recovery */
 213         atomic_t               erp_counter;
 214         u32                    maxframe_size;
 215         u32                    supported_classes;
 216         struct work_struct     gid_pn_work;
 217         struct work_struct     test_link_work;
 218         struct work_struct     rport_work;
 219         enum { RPORT_NONE, RPORT_ADD, RPORT_DEL }  rport_task;
 220         unsigned int            starget_id;
 221 };
 222
 223 /**
 224  * struct zfcp_unit - LUN configured via zfcp sysfs
 225  * @dev: struct device for sysfs representation and reference counting
 226  * @list: entry in LUN/unit list per zfcp_port
 227  * @port: reference to zfcp_port where this LUN is configured
 228  * @fcp_lun: 64 bit LUN value
 229  * @scsi_work: for running scsi_scan_target
 230  *
 231  * This is the representation of a LUN that has been configured for
 232  * usage. The main data here is the 64 bit LUN value, data for
 233  * running I/O and recovery is in struct zfcp_scsi_dev.
 234  */
 235 struct zfcp_unit {
 236         struct device           dev;
 237         struct list_head        list;
 238         struct zfcp_port        *port;
 239         u64                     fcp_lun;
 240         struct work_struct      scsi_work;
 241 };
 242
 243 /**
 244  * struct zfcp_scsi_dev - zfcp data per SCSI device
 245  * @status: zfcp internal status flags
 246  * @lun_handle: handle from "open lun" for issuing FSF requests
 247  * @erp_action: zfcp erp data for opening and recovering this LUN
 248  * @erp_counter: zfcp erp counter for this LUN
 249  * @latencies: FSF channel and fabric latencies
 250  * @port: zfcp_port where this LUN belongs to
 251  */
 252 struct zfcp_scsi_dev {
 253         atomic_t                status;
 254         u32                     lun_handle;
 255         struct zfcp_erp_action  erp_action;
 256         atomic_t                erp_counter;
 257         struct zfcp_latencies   latencies;
 258         struct zfcp_port        *port;
 259 };
 260
 261 /**
 262  * sdev_to_zfcp - Access zfcp LUN data for SCSI device
 263  * @sdev: scsi_device where to get the zfcp_scsi_dev pointer
 264  */
 265 static inline struct zfcp_scsi_dev *sdev_to_zfcp(struct scsi_device *sdev)
 266 {
 267         return scsi_transport_device_data(sdev);
 268 }
 269
 270 /**
 271  * zfcp_scsi_dev_lun - Return SCSI device LUN as 64 bit FCP LUN
 272  * @sdev: SCSI device where to get the LUN from
 273  */
 274 static inline u64 zfcp_scsi_dev_lun(struct scsi_device *sdev)
 275 {
 276         u64 fcp_lun;
 277
 278         int_to_scsilun(sdev->lun, (struct scsi_lun *)&fcp_lun);
 279         return fcp_lun;
 280 }
 281
 282 /**
 283  * struct zfcp_fsf_req - basic FSF request structure
 284  * @list: list of FSF requests
 285  * @req_id: unique request ID
 286  * @adapter: adapter this request belongs to
 287  * @qdio_req: qdio queue related values
 288  * @completion: used to signal the completion of the request
 289  * @status: status of the request
 290  * @fsf_command: FSF command issued
 291  * @qtcb: associated QTCB
 292  * @seq_no: sequence number of this request
 293  * @data: private data
 294  * @timer: timer data of this request
 295  * @erp_action: reference to erp action if request issued on behalf of ERP
 296  * @pool: reference to memory pool if used for this request
 297  * @issued: time when request was send (STCK)
 298  * @handler: handler which should be called to process response
 299  */
 300 struct zfcp_fsf_req {
 301         struct list_head        list;
 302         unsigned long           req_id;
 303         struct zfcp_adapter     *adapter;
 304         struct zfcp_qdio_req    qdio_req;
 305         struct completion       completion;
 306         u32                     status;
 307         u32                     fsf_command;
 308         struct fsf_qtcb         *qtcb;
 309         u32                     seq_no;
 310         void                    *data;
 311         struct timer_list       timer;
 312         struct zfcp_erp_action  *erp_action;
 313         mempool_t               *pool;
 314         unsigned long long      issued;
 315         void                    (*handler)(struct zfcp_fsf_req *);
 316 };
 317
 318 static inline
 319 int zfcp_adapter_multi_buffer_active(struct zfcp_adapter *adapter)
 320 {
 321         return atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_MB_ACT;
 322 }
 323
 324 #endif /* ZFCP_DEF_H */