LXR linux/drivers/s390/scsi/zfcp

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * zfcp device driver
   4 *
   5 * Global definitions for the zfcp device driver.
   6 *
   7 * Copyright IBM Corp. 2002, 2017
   8 */
   9
  10#ifndef ZFCP_DEF_H
  11#define ZFCP_DEF_H
  12
  13/*************************** INCLUDES *****************************************/
  14
  15#include <linux/init.h>
  16#include <linux/moduleparam.h>
  17#include <linux/major.h>
  18#include <linux/blkdev.h>
  19#include <linux/delay.h>
  20#include <linux/timer.h>
  21#include <linux/slab.h>
  22#include <linux/mempool.h>
  23#include <linux/syscalls.h>
  24#include <linux/scatterlist.h>
  25#include <linux/ioctl.h>
  26#include <scsi/fc/fc_fs.h>
  27#include <scsi/fc/fc_gs.h>
  28#include <scsi/scsi.h>
  29#include <scsi/scsi_tcq.h>
  30#include <scsi/scsi_cmnd.h>
  31#include <scsi/scsi_device.h>
  32#include <scsi/scsi_host.h>
  33#include <scsi/scsi_transport.h>
  34#include <scsi/scsi_transport_fc.h>
  35#include <scsi/scsi_bsg_fc.h>
  36#include <asm/ccwdev.h>
  37#include <asm/debug.h>
  38#include <asm/ebcdic.h>
  39#include <asm/sysinfo.h>
  40#include "zfcp_fsf.h"
  41#include "zfcp_fc.h"
  42#include "zfcp_qdio.h"
  43
  44/********************* FSF SPECIFIC DEFINES *********************************/
  45
  46/* ATTENTION: value must not be used by hardware */
  47#define FSF_QTCB_UNSOLICITED_STATUS             0x6305
  48
  49/*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/
  50
  51/*
  52 * Note, the leftmost 12 status bits (3 nibbles) are common among adapter, port
  53 * and unit. This is a mask for bitwise 'and' with status values.
  54 */
  55#define ZFCP_COMMON_FLAGS                       0xfff00000
  56
  57/* common status bits */
  58#define ZFCP_STATUS_COMMON_RUNNING              0x40000000
  59#define ZFCP_STATUS_COMMON_ERP_FAILED           0x20000000
  60#define ZFCP_STATUS_COMMON_UNBLOCKED            0x10000000
  61#define ZFCP_STATUS_COMMON_OPEN                 0x04000000
  62#define ZFCP_STATUS_COMMON_ERP_INUSE            0x01000000
  63#define ZFCP_STATUS_COMMON_ACCESS_DENIED        0x00800000
  64#define ZFCP_STATUS_COMMON_ACCESS_BOXED         0x00400000
  65#define ZFCP_STATUS_COMMON_NOESC                0x00200000
  66
  67/* adapter status */
  68#define ZFCP_STATUS_ADAPTER_MB_ACT              0x00000001
  69#define ZFCP_STATUS_ADAPTER_QDIOUP              0x00000002
  70#define ZFCP_STATUS_ADAPTER_SIOSL_ISSUED        0x00000004
  71#define ZFCP_STATUS_ADAPTER_XCONFIG_OK          0x00000008
  72#define ZFCP_STATUS_ADAPTER_HOST_CON_INIT       0x00000010
  73#define ZFCP_STATUS_ADAPTER_SUSPENDED           0x00000040
  74#define ZFCP_STATUS_ADAPTER_ERP_PENDING         0x00000100
  75#define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED      0x00000200
  76#define ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED    0x00000400
  77
  78/* remote port status */
  79#define ZFCP_STATUS_PORT_PHYS_OPEN              0x00000001
  80#define ZFCP_STATUS_PORT_LINK_TEST              0x00000002
  81
  82/* FSF request status (this does not have a common part) */
  83#define ZFCP_STATUS_FSFREQ_ERROR                0x00000008
  84#define ZFCP_STATUS_FSFREQ_CLEANUP              0x00000010
  85#define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED       0x00000040
  86#define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED       0x00000080
  87#define ZFCP_STATUS_FSFREQ_TMFUNCFAILED         0x00000200
  88#define ZFCP_STATUS_FSFREQ_DISMISSED            0x00001000
  89
  90/************************* STRUCTURE DEFINITIONS *****************************/
  91
  92/**
  93 * enum zfcp_erp_act_type - Type of ERP action object.
  94 * @ZFCP_ERP_ACTION_REOPEN_LUN: LUN recovery.
  95 * @ZFCP_ERP_ACTION_REOPEN_PORT: Port recovery.
  96 * @ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: Forced port recovery.
  97 * @ZFCP_ERP_ACTION_REOPEN_ADAPTER: Adapter recovery.
  98 *
  99 * Values must fit into u8 because of code dependencies:
 100 * zfcp_dbf_rec_trig(), &zfcp_dbf_rec_trigger.want, &zfcp_dbf_rec_trigger.need;
 101 * zfcp_dbf_rec_run_lvl(), zfcp_dbf_rec_run(), &zfcp_dbf_rec_running.rec_action.
 102 */
 103enum zfcp_erp_act_type {
 104        ZFCP_ERP_ACTION_REOPEN_LUN         = 1,
 105        ZFCP_ERP_ACTION_REOPEN_PORT        = 2,
 106        ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
 107        ZFCP_ERP_ACTION_REOPEN_ADAPTER     = 4,
 108};
 109
 110/*
 111 * Values must fit into u16 because of code dependencies:
 112 * zfcp_dbf_rec_run_lvl(), zfcp_dbf_rec_run(), zfcp_dbf_rec_run_wka(),
 113 * &zfcp_dbf_rec_running.rec_step.
 114 */
 115enum zfcp_erp_steps {
 116        ZFCP_ERP_STEP_UNINITIALIZED     = 0x0000,
 117        ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
 118        ZFCP_ERP_STEP_PORT_CLOSING      = 0x0100,
 119        ZFCP_ERP_STEP_PORT_OPENING      = 0x0800,
 120        ZFCP_ERP_STEP_LUN_CLOSING       = 0x1000,
 121        ZFCP_ERP_STEP_LUN_OPENING       = 0x2000,
 122};
 123
 124struct zfcp_erp_action {
 125        struct list_head list;
 126        enum zfcp_erp_act_type type;  /* requested action code */
 127        struct zfcp_adapter *adapter; /* device which should be recovered */
 128        struct zfcp_port *port;
 129        struct scsi_device *sdev;
 130        u32             status;       /* recovery status */
 131        enum zfcp_erp_steps     step;   /* active step of this erp action */
 132        unsigned long           fsf_req_id;
 133        struct timer_list timer;
 134};
 135
 136/* holds various memory pools of an adapter */
 137struct zfcp_adapter_mempool {
 138        mempool_t *erp_req;
 139        mempool_t *gid_pn_req;
 140        mempool_t *scsi_req;
 141        mempool_t *scsi_abort;
 142        mempool_t *status_read_req;
 143        mempool_t *sr_data;
 144        mempool_t *gid_pn;
 145        mempool_t *qtcb_pool;
 146};
 147
 148struct zfcp_adapter {
 149        struct kref             ref;
 150        u64                     peer_wwnn;         /* P2P peer WWNN */
 151        u64                     peer_wwpn;         /* P2P peer WWPN */
 152        u32                     peer_d_id;         /* P2P peer D_ID */
 153        struct ccw_device       *ccw_device;       /* S/390 ccw device */
 154        struct zfcp_qdio        *qdio;
 155        u32                     hydra_version;     /* Hydra version */
 156        u32                     fsf_lic_version;
 157        u32                     adapter_features;  /* FCP channel features */
 158        u32                     connection_features; /* host connection features */
 159        u32                     hardware_version;  /* of FCP channel */
 160        u16                     timer_ticks;       /* time int for a tick */
 161        struct Scsi_Host        *scsi_host;        /* Pointer to mid-layer */
 162        struct list_head        port_list;         /* remote port list */
 163        rwlock_t                port_list_lock;    /* port list lock */
 164        unsigned long           req_no;            /* unique FSF req number */
 165        struct zfcp_reqlist     *req_list;
 166        u32                     fsf_req_seq_no;    /* FSF cmnd seq number */
 167        rwlock_t                abort_lock;        /* Protects against SCSI
 168                                                      stack abort/command
 169                                                      completion races */
 170        atomic_t                stat_miss;         /* # missing status reads*/
 171        unsigned int            stat_read_buf_num;
 172        struct work_struct      stat_work;
 173        atomic_t                status;            /* status of this adapter */
 174        struct list_head        erp_ready_head;    /* error recovery for this
 175                                                      adapter/devices */
 176        wait_queue_head_t       erp_ready_wq;
 177        struct list_head        erp_running_head;
 178        rwlock_t                erp_lock;
 179        wait_queue_head_t       erp_done_wqh;
 180        struct zfcp_erp_action  erp_action;        /* pending error recovery */
 181        atomic_t                erp_counter;
 182        u32                     erp_total_count;   /* total nr of enqueued erp
 183                                                      actions */
 184        u32                     erp_low_mem_count; /* nr of erp actions waiting
 185                                                      for memory */
 186        struct task_struct      *erp_thread;
 187        struct zfcp_fc_wka_ports *gs;              /* generic services */
 188        struct zfcp_dbf         *dbf;              /* debug traces */
 189        struct zfcp_adapter_mempool     pool;      /* Adapter memory pools */
 190        struct fc_host_statistics *fc_stats;
 191        struct fsf_qtcb_bottom_port *stats_reset_data;
 192        unsigned long           stats_reset;
 193        struct delayed_work     scan_work;
 194        struct work_struct      ns_up_work;
 195        struct service_level    service_level;
 196        struct workqueue_struct *work_queue;
 197        struct device_dma_parameters dma_parms;
 198        struct zfcp_fc_events events;
 199        unsigned long           next_port_scan;
 200};
 201
 202struct zfcp_port {
 203        struct device          dev;
 204        struct fc_rport        *rport;         /* rport of fc transport class */
 205        struct list_head       list;           /* list of remote ports */
 206        struct zfcp_adapter    *adapter;       /* adapter used to access port */
 207        struct list_head        unit_list;      /* head of logical unit list */
 208        rwlock_t                unit_list_lock; /* unit list lock */
 209        atomic_t                units;         /* zfcp_unit count */
 210        atomic_t               status;         /* status of this remote port */
 211        u64                    wwnn;           /* WWNN if known */
 212        u64                    wwpn;           /* WWPN */
 213        u32                    d_id;           /* D_ID */
 214        u32                    handle;         /* handle assigned by FSF */
 215        struct zfcp_erp_action erp_action;     /* pending error recovery */
 216        atomic_t               erp_counter;
 217        u32                    maxframe_size;
 218        u32                    supported_classes;
 219        struct work_struct     gid_pn_work;
 220        struct work_struct     test_link_work;
 221        struct work_struct     rport_work;
 222        enum { RPORT_NONE, RPORT_ADD, RPORT_DEL }  rport_task;
 223        unsigned int            starget_id;
 224};
 225
 226struct zfcp_latency_record {
 227        u32 min;
 228        u32 max;
 229        u64 sum;
 230};
 231
 232struct zfcp_latency_cont {
 233        struct zfcp_latency_record channel;
 234        struct zfcp_latency_record fabric;
 235        u64 counter;
 236};
 237
 238struct zfcp_latencies {
 239        struct zfcp_latency_cont read;
 240        struct zfcp_latency_cont write;
 241        struct zfcp_latency_cont cmd;
 242        spinlock_t lock;
 243};
 244
 245/**
 246 * struct zfcp_unit - LUN configured via zfcp sysfs
 247 * @dev: struct device for sysfs representation and reference counting
 248 * @list: entry in LUN/unit list per zfcp_port
 249 * @port: reference to zfcp_port where this LUN is configured
 250 * @fcp_lun: 64 bit LUN value
 251 * @scsi_work: for running scsi_scan_target
 252 *
 253 * This is the representation of a LUN that has been configured for
 254 * usage. The main data here is the 64 bit LUN value, data for
 255 * running I/O and recovery is in struct zfcp_scsi_dev.
 256 */
 257struct zfcp_unit {
 258        struct device           dev;
 259        struct list_head        list;
 260        struct zfcp_port        *port;
 261        u64                     fcp_lun;
 262        struct work_struct      scsi_work;
 263};
 264
 265/**
 266 * struct zfcp_scsi_dev - zfcp data per SCSI device
 267 * @status: zfcp internal status flags
 268 * @lun_handle: handle from "open lun" for issuing FSF requests
 269 * @erp_action: zfcp erp data for opening and recovering this LUN
 270 * @erp_counter: zfcp erp counter for this LUN
 271 * @latencies: FSF channel and fabric latencies
 272 * @port: zfcp_port where this LUN belongs to
 273 */
 274struct zfcp_scsi_dev {
 275        atomic_t                status;
 276        u32                     lun_handle;
 277        struct zfcp_erp_action  erp_action;
 278        atomic_t                erp_counter;
 279        struct zfcp_latencies   latencies;
 280        struct zfcp_port        *port;
 281};
 282
 283/**
 284 * sdev_to_zfcp - Access zfcp LUN data for SCSI device
 285 * @sdev: scsi_device where to get the zfcp_scsi_dev pointer
 286 */
 287static inline struct zfcp_scsi_dev *sdev_to_zfcp(struct scsi_device *sdev)
 288{
 289        return scsi_transport_device_data(sdev);
 290}
 291
 292/**
 293 * zfcp_scsi_dev_lun - Return SCSI device LUN as 64 bit FCP LUN
 294 * @sdev: SCSI device where to get the LUN from
 295 */
 296static inline u64 zfcp_scsi_dev_lun(struct scsi_device *sdev)
 297{
 298        u64 fcp_lun;
 299
 300        int_to_scsilun(sdev->lun, (struct scsi_lun *)&fcp_lun);
 301        return fcp_lun;
 302}
 303
 304/**
 305 * struct zfcp_fsf_req - basic FSF request structure
 306 * @list: list of FSF requests
 307 * @req_id: unique request ID
 308 * @adapter: adapter this request belongs to
 309 * @qdio_req: qdio queue related values
 310 * @completion: used to signal the completion of the request
 311 * @status: status of the request
 312 * @qtcb: associated QTCB
 313 * @data: private data
 314 * @timer: timer data of this request
 315 * @erp_action: reference to erp action if request issued on behalf of ERP
 316 * @pool: reference to memory pool if used for this request
 317 * @issued: time when request was send (STCK)
 318 * @handler: handler which should be called to process response
 319 */
 320struct zfcp_fsf_req {
 321        struct list_head        list;
 322        unsigned long           req_id;
 323        struct zfcp_adapter     *adapter;
 324        struct zfcp_qdio_req    qdio_req;
 325        struct completion       completion;
 326        u32                     status;
 327        struct fsf_qtcb         *qtcb;
 328        void                    *data;
 329        struct timer_list       timer;
 330        struct zfcp_erp_action  *erp_action;
 331        mempool_t               *pool;
 332        unsigned long long      issued;
 333        void                    (*handler)(struct zfcp_fsf_req *);
 334};
 335
 336static inline
 337int zfcp_adapter_multi_buffer_active(struct zfcp_adapter *adapter)
 338{
 339        return atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_MB_ACT;
 340}
 341
 342static inline bool zfcp_fsf_req_is_status_read_buffer(struct zfcp_fsf_req *req)
 343{
 344        return req->qtcb == NULL;
 345}
 346
 347#endif /* ZFCP_DEF_H */
 348