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_QDIOUP 0x00000002 76 #define ZFCP_STATUS_ADAPTER_SIOSL_ISSUED 0x00000004 77 #define ZFCP_STATUS_ADAPTER_XCONFIG_OK 0x00000008 78 #define ZFCP_STATUS_ADAPTER_HOST_CON_INIT 0x00000010 79 #define ZFCP_STATUS_ADAPTER_ERP_PENDING 0x00000100 80 #define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED 0x00000200 81 #define ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED 0x00000400 82 83 /* remote port status */ 84 #define ZFCP_STATUS_PORT_PHYS_OPEN 0x00000001 85 #define ZFCP_STATUS_PORT_LINK_TEST 0x00000002 86 87 /* logical unit status */ 88 #define ZFCP_STATUS_LUN_SHARED 0x00000004 89 #define ZFCP_STATUS_LUN_READONLY 0x00000008 90 91 /* FSF request status (this does not have a common part) */ 92 #define ZFCP_STATUS_FSFREQ_ERROR 0x00000008 93 #define ZFCP_STATUS_FSFREQ_CLEANUP 0x00000010 94 #define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED 0x00000040 95 #define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED 0x00000080 96 #define ZFCP_STATUS_FSFREQ_TMFUNCFAILED 0x00000200 97 #define ZFCP_STATUS_FSFREQ_DISMISSED 0x00001000 98 99 /************************* STRUCTURE DEFINITIONS *****************************/ 100 101 struct zfcp_fsf_req; 102 103 /* holds various memory pools of an adapter */ 104 struct zfcp_adapter_mempool { 105 mempool_t *erp_req; 106 mempool_t *gid_pn_req; 107 mempool_t *scsi_req; 108 mempool_t *scsi_abort; 109 mempool_t *status_read_req; 110 mempool_t *sr_data; 111 mempool_t *gid_pn; 112 mempool_t *qtcb_pool; 113 }; 114 115 struct zfcp_erp_action { 116 struct list_head list; 117 int action; /* requested action code */ 118 struct zfcp_adapter *adapter; /* device which should be recovered */ 119 struct zfcp_port *port; 120 struct scsi_device *sdev; 121 u32 status; /* recovery status */ 122 u32 step; /* active step of this erp action */ 123 unsigned long fsf_req_id; 124 struct timer_list timer; 125 }; 126 127 struct fsf_latency_record { 128 u32 min; 129 u32 max; 130 u64 sum; 131 }; 132 133 struct latency_cont { 134 struct fsf_latency_record channel; 135 struct fsf_latency_record fabric; 136 u64 counter; 137 }; 138 139 struct zfcp_latencies { 140 struct latency_cont read; 141 struct latency_cont write; 142 struct latency_cont cmd; 143 spinlock_t lock; 144 }; 145 146 struct zfcp_adapter { 147 struct kref ref; 148 u64 peer_wwnn; /* P2P peer WWNN */ 149 u64 peer_wwpn; /* P2P peer WWPN */ 150 u32 peer_d_id; /* P2P peer D_ID */ 151 struct ccw_device *ccw_device; /* S/390 ccw device */ 152 struct zfcp_qdio *qdio; 153 u32 hydra_version; /* Hydra version */ 154 u32 fsf_lic_version; 155 u32 adapter_features; /* FCP channel features */ 156 u32 connection_features; /* host connection features */ 157 u32 hardware_version; /* of FCP channel */ 158 u16 timer_ticks; /* time int for a tick */ 159 struct Scsi_Host *scsi_host; /* Pointer to mid-layer */ 160 struct list_head port_list; /* remote port list */ 161 rwlock_t port_list_lock; /* port list lock */ 162 unsigned long req_no; /* unique FSF req number */ 163 struct zfcp_reqlist *req_list; 164 u32 fsf_req_seq_no; /* FSF cmnd seq number */ 165 rwlock_t abort_lock; /* Protects against SCSI 166 stack abort/command 167 completion races */ 168 atomic_t stat_miss; /* # missing status reads*/ 169 unsigned int stat_read_buf_num; 170 struct work_struct stat_work; 171 atomic_t status; /* status of this adapter */ 172 struct list_head erp_ready_head; /* error recovery for this 173 adapter/devices */ 174 wait_queue_head_t erp_ready_wq; 175 struct list_head erp_running_head; 176 rwlock_t erp_lock; 177 wait_queue_head_t erp_done_wqh; 178 struct zfcp_erp_action erp_action; /* pending error recovery */ 179 atomic_t erp_counter; 180 u32 erp_total_count; /* total nr of enqueued erp 181 actions */ 182 u32 erp_low_mem_count; /* nr of erp actions waiting 183 for memory */ 184 struct task_struct *erp_thread; 185 struct zfcp_fc_wka_ports *gs; /* generic services */ 186 struct zfcp_dbf *dbf; /* debug traces */ 187 struct zfcp_adapter_mempool pool; /* Adapter memory pools */ 188 struct fc_host_statistics *fc_stats; 189 struct fsf_qtcb_bottom_port *stats_reset_data; 190 unsigned long stats_reset; 191 struct work_struct scan_work; 192 struct service_level service_level; 193 struct workqueue_struct *work_queue; 194 struct device_dma_parameters dma_parms; 195 struct zfcp_fc_events events; 196 }; 197 198 struct zfcp_port { 199 struct device dev; 200 struct fc_rport *rport; /* rport of fc transport class */ 201 struct list_head list; /* list of remote ports */ 202 struct zfcp_adapter *adapter; /* adapter used to access port */ 203 struct list_head unit_list; /* head of logical unit list */ 204 rwlock_t unit_list_lock; /* unit list lock */ 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 #endif /* ZFCP_DEF_H */ 317