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_qdio.h"
  41
  42 struct zfcp_reqlist;
  43
  44 /********************* SCSI SPECIFIC DEFINES *********************************/
  45 #define ZFCP_SCSI_ER_TIMEOUT                    (10*HZ)
  46
  47 /********************* CIO/QDIO SPECIFIC DEFINES *****************************/
  48
  49 /* DMQ bug workaround: don't use last SBALE */
  50 #define ZFCP_MAX_SBALES_PER_SBAL        (QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
  51
  52 /* index of last SBALE (with respect to DMQ bug workaround) */
  53 #define ZFCP_LAST_SBALE_PER_SBAL        (ZFCP_MAX_SBALES_PER_SBAL - 1)
  54
  55 /* max. number of (data buffer) SBALEs in largest SBAL chain */
  56 #define ZFCP_MAX_SBALES_PER_REQ         \
  57         (FSF_MAX_SBALS_PER_REQ * ZFCP_MAX_SBALES_PER_SBAL - 2)
  58         /* request ID + QTCB in SBALE 0 + 1 of first SBAL in chain */
  59
  60 #define ZFCP_MAX_SECTORS (ZFCP_MAX_SBALES_PER_REQ * 8)
  61         /* max. number of (data buffer) SBALEs in largest SBAL chain
  62            multiplied with number of sectors per 4k block */
  63
  64 /********************* FSF SPECIFIC DEFINES *********************************/
  65
  66 /* ATTENTION: value must not be used by hardware */
  67 #define FSF_QTCB_UNSOLICITED_STATUS             0x6305
  68
  69 /* timeout value for "default timer" for fsf requests */
  70 #define ZFCP_FSF_REQUEST_TIMEOUT (60*HZ)
  71
  72 /*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/
  73
  74 /*
  75  * Note, the leftmost status byte is common among adapter, port
  76  * and unit
  77  */
  78 #define ZFCP_COMMON_FLAGS                       0xfff00000
  79
  80 /* common status bits */
  81 #define ZFCP_STATUS_COMMON_RUNNING              0x40000000
  82 #define ZFCP_STATUS_COMMON_ERP_FAILED           0x20000000
  83 #define ZFCP_STATUS_COMMON_UNBLOCKED            0x10000000
  84 #define ZFCP_STATUS_COMMON_OPEN                 0x04000000
  85 #define ZFCP_STATUS_COMMON_ERP_INUSE            0x01000000
  86 #define ZFCP_STATUS_COMMON_ACCESS_DENIED        0x00800000
  87 #define ZFCP_STATUS_COMMON_ACCESS_BOXED         0x00400000
  88 #define ZFCP_STATUS_COMMON_NOESC                0x00200000
  89
  90 /* adapter status */
  91 #define ZFCP_STATUS_ADAPTER_QDIOUP              0x00000002
  92 #define ZFCP_STATUS_ADAPTER_XCONFIG_OK          0x00000008
  93 #define ZFCP_STATUS_ADAPTER_HOST_CON_INIT       0x00000010
  94 #define ZFCP_STATUS_ADAPTER_ERP_PENDING         0x00000100
  95 #define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED      0x00000200
  96
  97 /* remote port status */
  98 #define ZFCP_STATUS_PORT_PHYS_OPEN              0x00000001
  99 #define ZFCP_STATUS_PORT_LINK_TEST              0x00000002
 100
 101 /* logical unit status */
 102 #define ZFCP_STATUS_UNIT_SHARED                 0x00000004
 103 #define ZFCP_STATUS_UNIT_READONLY               0x00000008
 104
 105 /* FSF request status (this does not have a common part) */
 106 #define ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT      0x00000002
 107 #define ZFCP_STATUS_FSFREQ_ERROR                0x00000008
 108 #define ZFCP_STATUS_FSFREQ_CLEANUP              0x00000010
 109 #define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED       0x00000040
 110 #define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED       0x00000080
 111 #define ZFCP_STATUS_FSFREQ_TMFUNCFAILED         0x00000200
 112 #define ZFCP_STATUS_FSFREQ_DISMISSED            0x00001000
 113
 114 /************************* STRUCTURE DEFINITIONS *****************************/
 115
 116 struct zfcp_fsf_req;
 117
 118 /* holds various memory pools of an adapter */
 119 struct zfcp_adapter_mempool {
 120         mempool_t *erp_req;
 121         mempool_t *gid_pn_req;
 122         mempool_t *scsi_req;
 123         mempool_t *scsi_abort;
 124         mempool_t *status_read_req;
 125         mempool_t *status_read_data;
 126         mempool_t *gid_pn;
 127         mempool_t *qtcb_pool;
 128 };
 129
 130 struct zfcp_erp_action {
 131         struct list_head list;
 132         int action;                   /* requested action code */
 133         struct zfcp_adapter *adapter; /* device which should be recovered */
 134         struct zfcp_port *port;
 135         struct zfcp_unit *unit;
 136         u32             status;       /* recovery status */
 137         u32 step;                     /* active step of this erp action */
 138         unsigned long           fsf_req_id;
 139         struct timer_list timer;
 140 };
 141
 142 struct fsf_latency_record {
 143         u32 min;
 144         u32 max;
 145         u64 sum;
 146 };
 147
 148 struct latency_cont {
 149         struct fsf_latency_record channel;
 150         struct fsf_latency_record fabric;
 151         u64 counter;
 152 };
 153
 154 struct zfcp_latencies {
 155         struct latency_cont read;
 156         struct latency_cont write;
 157         struct latency_cont cmd;
 158         spinlock_t lock;
 159 };
 160
 161 struct zfcp_adapter {
 162         struct kref             ref;
 163         u64                     peer_wwnn;         /* P2P peer WWNN */
 164         u64                     peer_wwpn;         /* P2P peer WWPN */
 165         u32                     peer_d_id;         /* P2P peer D_ID */
 166         struct ccw_device       *ccw_device;       /* S/390 ccw device */
 167         struct zfcp_qdio        *qdio;
 168         u32                     hydra_version;     /* Hydra version */
 169         u32                     fsf_lic_version;
 170         u32                     adapter_features;  /* FCP channel features */
 171         u32                     connection_features; /* host connection features */
 172         u32                     hardware_version;  /* of FCP channel */
 173         u16                     timer_ticks;       /* time int for a tick */
 174         struct Scsi_Host        *scsi_host;        /* Pointer to mid-layer */
 175         struct list_head        port_list;         /* remote port list */
 176         rwlock_t                port_list_lock;    /* port list lock */
 177         unsigned long           req_no;            /* unique FSF req number */
 178         struct zfcp_reqlist     *req_list;
 179         u32                     fsf_req_seq_no;    /* FSF cmnd seq number */
 180         rwlock_t                abort_lock;        /* Protects against SCSI
 181                                                       stack abort/command
 182                                                       completion races */
 183         atomic_t                stat_miss;         /* # missing status reads*/
 184         struct work_struct      stat_work;
 185         atomic_t                status;            /* status of this adapter */
 186         struct list_head        erp_ready_head;    /* error recovery for this
 187                                                       adapter/devices */
 188         wait_queue_head_t       erp_ready_wq;
 189         struct list_head        erp_running_head;
 190         rwlock_t                erp_lock;
 191         wait_queue_head_t       erp_done_wqh;
 192         struct zfcp_erp_action  erp_action;        /* pending error recovery */
 193         atomic_t                erp_counter;
 194         u32                     erp_total_count;   /* total nr of enqueued erp
 195                                                       actions */
 196         u32                     erp_low_mem_count; /* nr of erp actions waiting
 197                                                       for memory */
 198         struct task_struct      *erp_thread;
 199         struct zfcp_fc_wka_ports *gs;              /* generic services */
 200         struct zfcp_dbf         *dbf;              /* debug traces */
 201         struct zfcp_adapter_mempool     pool;      /* Adapter memory pools */
 202         struct fc_host_statistics *fc_stats;
 203         struct fsf_qtcb_bottom_port *stats_reset_data;
 204         unsigned long           stats_reset;
 205         struct work_struct      scan_work;
 206         struct service_level    service_level;
 207         struct workqueue_struct *work_queue;
 208 };
 209
 210 struct zfcp_port {
 211         struct device          dev;
 212         struct fc_rport        *rport;         /* rport of fc transport class */
 213         struct list_head       list;           /* list of remote ports */
 214         struct zfcp_adapter    *adapter;       /* adapter used to access port */
 215         struct list_head        unit_list;      /* head of logical unit list */
 216         rwlock_t                unit_list_lock; /* unit list lock */
 217         atomic_t               status;         /* status of this remote port */
 218         u64                    wwnn;           /* WWNN if known */
 219         u64                    wwpn;           /* WWPN */
 220         u32                    d_id;           /* D_ID */
 221         u32                    handle;         /* handle assigned by FSF */
 222         struct zfcp_erp_action erp_action;     /* pending error recovery */
 223         atomic_t               erp_counter;
 224         u32                    maxframe_size;
 225         u32                    supported_classes;
 226         struct work_struct     gid_pn_work;
 227         struct work_struct     test_link_work;
 228         struct work_struct     rport_work;
 229         enum { RPORT_NONE, RPORT_ADD, RPORT_DEL }  rport_task;
 230 };
 231
 232 struct zfcp_unit {
 233         struct device          dev;
 234         struct list_head       list;           /* list of logical units */
 235         struct zfcp_port       *port;          /* remote port of unit */
 236         atomic_t               status;         /* status of this logical unit */
 237         u64                    fcp_lun;        /* own FCP_LUN */
 238         u32                    handle;         /* handle assigned by FSF */
 239         struct scsi_device     *device;        /* scsi device struct pointer */
 240         struct zfcp_erp_action erp_action;     /* pending error recovery */
 241         atomic_t               erp_counter;
 242         struct zfcp_latencies   latencies;
 243         struct work_struct      scsi_work;
 244 };
 245
 246 /**
 247  * struct zfcp_fsf_req - basic FSF request structure
 248  * @list: list of FSF requests
 249  * @req_id: unique request ID
 250  * @adapter: adapter this request belongs to
 251  * @qdio_req: qdio queue related values
 252  * @completion: used to signal the completion of the request
 253  * @status: status of the request
 254  * @fsf_command: FSF command issued
 255  * @qtcb: associated QTCB
 256  * @seq_no: sequence number of this request
 257  * @data: private data
 258  * @timer: timer data of this request
 259  * @erp_action: reference to erp action if request issued on behalf of ERP
 260  * @pool: reference to memory pool if used for this request
 261  * @issued: time when request was send (STCK)
 262  * @unit: reference to unit if this request is a SCSI request
 263  * @handler: handler which should be called to process response
 264  */
 265 struct zfcp_fsf_req {
 266         struct list_head        list;
 267         unsigned long           req_id;
 268         struct zfcp_adapter     *adapter;
 269         struct zfcp_qdio_req    qdio_req;
 270         struct completion       completion;
 271         u32                     status;
 272         u32                     fsf_command;
 273         struct fsf_qtcb         *qtcb;
 274         u32                     seq_no;
 275         void                    *data;
 276         struct timer_list       timer;
 277         struct zfcp_erp_action  *erp_action;
 278         mempool_t               *pool;
 279         unsigned long long      issued;
 280         struct zfcp_unit        *unit;
 281         void                    (*handler)(struct zfcp_fsf_req *);
 282 };
 283
 284 /* driver data */
 285 struct zfcp_data {
 286         struct scsi_host_template scsi_host_template;
 287         struct scsi_transport_template *scsi_transport_template;
 288         struct kmem_cache       *gpn_ft_cache;
 289         struct kmem_cache       *qtcb_cache;
 290         struct kmem_cache       *sr_buffer_cache;
 291         struct kmem_cache       *gid_pn_cache;
 292         struct kmem_cache       *adisc_cache;
 293 };
 294
 295 /********************** ZFCP SPECIFIC DEFINES ********************************/
 296
 297 #define ZFCP_SET                0x00000100
 298 #define ZFCP_CLEAR              0x00000200
 299
 300 #endif /* ZFCP_DEF_H */