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, 2020 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_ERP_PENDING 0x00000100 74#define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED 0x00000200 75#define ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED 0x00000400 76 77/* remote port status */ 78#define ZFCP_STATUS_PORT_PHYS_OPEN 0x00000001 79#define ZFCP_STATUS_PORT_LINK_TEST 0x00000002 80 81/* FSF request status (this does not have a common part) */ 82#define ZFCP_STATUS_FSFREQ_ERROR 0x00000008 83#define ZFCP_STATUS_FSFREQ_CLEANUP 0x00000010 84#define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED 0x00000040 85#define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED 0x00000080 86#define ZFCP_STATUS_FSFREQ_TMFUNCFAILED 0x00000200 87#define ZFCP_STATUS_FSFREQ_DISMISSED 0x00001000 88#define ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE 0x00020000 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 u64 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 u32 fc_security_algorithms; /* of FCP channel */ 161 u32 fc_security_algorithms_old; /* of FCP channel */ 162 u16 timer_ticks; /* time int for a tick */ 163 struct Scsi_Host *scsi_host; /* Pointer to mid-layer */ 164 struct list_head port_list; /* remote port list */ 165 rwlock_t port_list_lock; /* port list lock */ 166 u64 req_no; /* unique FSF req number */ 167 struct zfcp_reqlist *req_list; 168 u32 fsf_req_seq_no; /* FSF cmnd seq number */ 169 rwlock_t abort_lock; /* Protects against SCSI 170 stack abort/command 171 completion races */ 172 atomic_t stat_miss; /* # missing status reads*/ 173 unsigned int stat_read_buf_num; 174 struct work_struct stat_work; 175 atomic_t status; /* status of this adapter */ 176 struct list_head erp_ready_head; /* error recovery for this 177 adapter/devices */ 178 wait_queue_head_t erp_ready_wq; 179 struct list_head erp_running_head; 180 rwlock_t erp_lock; 181 wait_queue_head_t erp_done_wqh; 182 struct zfcp_erp_action erp_action; /* pending error recovery */ 183 atomic_t erp_counter; 184 u32 erp_total_count; /* total nr of enqueued erp 185 actions */ 186 u32 erp_low_mem_count; /* nr of erp actions waiting 187 for memory */ 188 struct task_struct *erp_thread; 189 struct zfcp_fc_wka_ports *gs; /* generic services */ 190 struct zfcp_dbf *dbf; /* debug traces */ 191 struct zfcp_adapter_mempool pool; /* Adapter memory pools */ 192 struct fc_host_statistics *fc_stats; 193 struct fsf_qtcb_bottom_port *stats_reset_data; 194 unsigned long stats_reset; 195 struct delayed_work scan_work; 196 struct work_struct ns_up_work; 197 struct service_level service_level; 198 struct workqueue_struct *work_queue; 199 struct device_dma_parameters dma_parms; 200 struct zfcp_fc_events events; 201 unsigned long next_port_scan; 202 struct zfcp_diag_adapter *diagnostics; 203 struct work_struct version_change_lost_work; 204}; 205 206struct zfcp_port { 207 struct device dev; 208 struct fc_rport *rport; /* rport of fc transport class */ 209 struct list_head list; /* list of remote ports */ 210 struct zfcp_adapter *adapter; /* adapter used to access port */ 211 struct list_head unit_list; /* head of logical unit list */ 212 rwlock_t unit_list_lock; /* unit list lock */ 213 atomic_t units; /* zfcp_unit count */ 214 atomic_t status; /* status of this remote port */ 215 u64 wwnn; /* WWNN if known */ 216 u64 wwpn; /* WWPN */ 217 u32 d_id; /* D_ID */ 218 u32 handle; /* handle assigned by FSF */ 219 struct zfcp_erp_action erp_action; /* pending error recovery */ 220 atomic_t erp_counter; 221 u32 maxframe_size; 222 u32 supported_classes; 223 u32 connection_info; 224 u32 connection_info_old; 225 struct work_struct gid_pn_work; 226 struct work_struct test_link_work; 227 struct work_struct rport_work; 228 enum { RPORT_NONE, RPORT_ADD, RPORT_DEL } rport_task; 229 unsigned int starget_id; 230}; 231 232struct zfcp_latency_record { 233 u32 min; 234 u32 max; 235 u64 sum; 236}; 237 238struct zfcp_latency_cont { 239 struct zfcp_latency_record channel; 240 struct zfcp_latency_record fabric; 241 u64 counter; 242}; 243 244struct zfcp_latencies { 245 struct zfcp_latency_cont read; 246 struct zfcp_latency_cont write; 247 struct zfcp_latency_cont cmd; 248 spinlock_t lock; 249}; 250 251/** 252 * struct zfcp_unit - LUN configured via zfcp sysfs 253 * @dev: struct device for sysfs representation and reference counting 254 * @list: entry in LUN/unit list per zfcp_port 255 * @port: reference to zfcp_port where this LUN is configured 256 * @fcp_lun: 64 bit LUN value 257 * @scsi_work: for running scsi_scan_target 258 * 259 * This is the representation of a LUN that has been configured for 260 * usage. The main data here is the 64 bit LUN value, data for 261 * running I/O and recovery is in struct zfcp_scsi_dev. 262 */ 263struct zfcp_unit { 264 struct device dev; 265 struct list_head list; 266 struct zfcp_port *port; 267 u64 fcp_lun; 268 struct work_struct scsi_work; 269}; 270 271/** 272 * struct zfcp_scsi_dev - zfcp data per SCSI device 273 * @status: zfcp internal status flags 274 * @lun_handle: handle from "open lun" for issuing FSF requests 275 * @erp_action: zfcp erp data for opening and recovering this LUN 276 * @erp_counter: zfcp erp counter for this LUN 277 * @latencies: FSF channel and fabric latencies 278 * @port: zfcp_port where this LUN belongs to 279 */ 280struct zfcp_scsi_dev { 281 atomic_t status; 282 u32 lun_handle; 283 struct zfcp_erp_action erp_action; 284 atomic_t erp_counter; 285 struct zfcp_latencies latencies; 286 struct zfcp_port *port; 287}; 288 289/** 290 * sdev_to_zfcp - Access zfcp LUN data for SCSI device 291 * @sdev: scsi_device where to get the zfcp_scsi_dev pointer 292 */ 293static inline struct zfcp_scsi_dev *sdev_to_zfcp(struct scsi_device *sdev) 294{ 295 return scsi_transport_device_data(sdev); 296} 297 298/** 299 * zfcp_scsi_dev_lun - Return SCSI device LUN as 64 bit FCP LUN 300 * @sdev: SCSI device where to get the LUN from 301 */ 302static inline u64 zfcp_scsi_dev_lun(struct scsi_device *sdev) 303{ 304 u64 fcp_lun; 305 306 int_to_scsilun(sdev->lun, (struct scsi_lun *)&fcp_lun); 307 return fcp_lun; 308} 309 310/** 311 * struct zfcp_fsf_req - basic FSF request structure 312 * @list: list of FSF requests 313 * @req_id: unique request ID 314 * @adapter: adapter this request belongs to 315 * @qdio_req: qdio queue related values 316 * @completion: used to signal the completion of the request 317 * @status: status of the request 318 * @qtcb: associated QTCB 319 * @data: private data 320 * @timer: timer data of this request 321 * @erp_action: reference to erp action if request issued on behalf of ERP 322 * @pool: reference to memory pool if used for this request 323 * @issued: time when request was send (STCK) 324 * @handler: handler which should be called to process response 325 */ 326struct zfcp_fsf_req { 327 struct list_head list; 328 u64 req_id; 329 struct zfcp_adapter *adapter; 330 struct zfcp_qdio_req qdio_req; 331 struct completion completion; 332 u32 status; 333 struct fsf_qtcb *qtcb; 334 void *data; 335 struct timer_list timer; 336 struct zfcp_erp_action *erp_action; 337 mempool_t *pool; 338 unsigned long long issued; 339 void (*handler)(struct zfcp_fsf_req *); 340}; 341 342static inline 343int zfcp_adapter_multi_buffer_active(struct zfcp_adapter *adapter) 344{ 345 return atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_MB_ACT; 346} 347 348static inline bool zfcp_fsf_req_is_status_read_buffer(struct zfcp_fsf_req *req) 349{ 350 return req->qtcb == NULL; 351} 352 353#endif /* ZFCP_DEF_H */ 354