348 lines
11 KiB
C
348 lines
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* zfcp device driver
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*
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* Global definitions for the zfcp device driver.
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*
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* Copyright IBM Corp. 2002, 2017
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*/
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#ifndef ZFCP_DEF_H
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#define ZFCP_DEF_H
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/*************************** INCLUDES *****************************************/
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#include <linux/init.h>
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#include <linux/moduleparam.h>
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#include <linux/major.h>
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#include <linux/blkdev.h>
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#include <linux/delay.h>
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#include <linux/timer.h>
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#include <linux/slab.h>
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#include <linux/mempool.h>
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#include <linux/syscalls.h>
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#include <linux/scatterlist.h>
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#include <linux/ioctl.h>
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#include <scsi/fc/fc_fs.h>
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#include <scsi/fc/fc_gs.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_tcq.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_transport.h>
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#include <scsi/scsi_transport_fc.h>
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#include <scsi/scsi_bsg_fc.h>
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#include <asm/ccwdev.h>
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#include <asm/debug.h>
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#include <asm/ebcdic.h>
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#include <asm/sysinfo.h>
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#include "zfcp_fsf.h"
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#include "zfcp_fc.h"
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#include "zfcp_qdio.h"
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/********************* FSF SPECIFIC DEFINES *********************************/
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/* ATTENTION: value must not be used by hardware */
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#define FSF_QTCB_UNSOLICITED_STATUS 0x6305
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/*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/
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/*
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* Note, the leftmost 12 status bits (3 nibbles) are common among adapter, port
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* and unit. This is a mask for bitwise 'and' with status values.
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*/
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#define ZFCP_COMMON_FLAGS 0xfff00000
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/* common status bits */
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#define ZFCP_STATUS_COMMON_RUNNING 0x40000000
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#define ZFCP_STATUS_COMMON_ERP_FAILED 0x20000000
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#define ZFCP_STATUS_COMMON_UNBLOCKED 0x10000000
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#define ZFCP_STATUS_COMMON_OPEN 0x04000000
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#define ZFCP_STATUS_COMMON_ERP_INUSE 0x01000000
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#define ZFCP_STATUS_COMMON_ACCESS_DENIED 0x00800000
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#define ZFCP_STATUS_COMMON_ACCESS_BOXED 0x00400000
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#define ZFCP_STATUS_COMMON_NOESC 0x00200000
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/* adapter status */
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#define ZFCP_STATUS_ADAPTER_MB_ACT 0x00000001
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#define ZFCP_STATUS_ADAPTER_QDIOUP 0x00000002
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#define ZFCP_STATUS_ADAPTER_SIOSL_ISSUED 0x00000004
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#define ZFCP_STATUS_ADAPTER_XCONFIG_OK 0x00000008
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#define ZFCP_STATUS_ADAPTER_HOST_CON_INIT 0x00000010
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#define ZFCP_STATUS_ADAPTER_SUSPENDED 0x00000040
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#define ZFCP_STATUS_ADAPTER_ERP_PENDING 0x00000100
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#define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED 0x00000200
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#define ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED 0x00000400
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/* remote port status */
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#define ZFCP_STATUS_PORT_PHYS_OPEN 0x00000001
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#define ZFCP_STATUS_PORT_LINK_TEST 0x00000002
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/* FSF request status (this does not have a common part) */
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#define ZFCP_STATUS_FSFREQ_ERROR 0x00000008
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#define ZFCP_STATUS_FSFREQ_CLEANUP 0x00000010
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#define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED 0x00000040
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#define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED 0x00000080
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#define ZFCP_STATUS_FSFREQ_TMFUNCFAILED 0x00000200
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#define ZFCP_STATUS_FSFREQ_DISMISSED 0x00001000
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/************************* STRUCTURE DEFINITIONS *****************************/
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/**
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* enum zfcp_erp_act_type - Type of ERP action object.
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* @ZFCP_ERP_ACTION_REOPEN_LUN: LUN recovery.
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* @ZFCP_ERP_ACTION_REOPEN_PORT: Port recovery.
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* @ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: Forced port recovery.
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* @ZFCP_ERP_ACTION_REOPEN_ADAPTER: Adapter recovery.
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*
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* Values must fit into u8 because of code dependencies:
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* zfcp_dbf_rec_trig(), &zfcp_dbf_rec_trigger.want, &zfcp_dbf_rec_trigger.need;
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* zfcp_dbf_rec_run_lvl(), zfcp_dbf_rec_run(), &zfcp_dbf_rec_running.rec_action.
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*/
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enum zfcp_erp_act_type {
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ZFCP_ERP_ACTION_REOPEN_LUN = 1,
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ZFCP_ERP_ACTION_REOPEN_PORT = 2,
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ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
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ZFCP_ERP_ACTION_REOPEN_ADAPTER = 4,
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};
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/*
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* Values must fit into u16 because of code dependencies:
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* zfcp_dbf_rec_run_lvl(), zfcp_dbf_rec_run(), zfcp_dbf_rec_run_wka(),
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* &zfcp_dbf_rec_running.rec_step.
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*/
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enum zfcp_erp_steps {
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ZFCP_ERP_STEP_UNINITIALIZED = 0x0000,
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ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
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ZFCP_ERP_STEP_PORT_CLOSING = 0x0100,
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ZFCP_ERP_STEP_PORT_OPENING = 0x0800,
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ZFCP_ERP_STEP_LUN_CLOSING = 0x1000,
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ZFCP_ERP_STEP_LUN_OPENING = 0x2000,
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};
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struct zfcp_erp_action {
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struct list_head list;
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enum zfcp_erp_act_type type; /* requested action code */
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struct zfcp_adapter *adapter; /* device which should be recovered */
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struct zfcp_port *port;
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struct scsi_device *sdev;
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u32 status; /* recovery status */
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enum zfcp_erp_steps step; /* active step of this erp action */
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unsigned long fsf_req_id;
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struct timer_list timer;
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};
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/* holds various memory pools of an adapter */
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struct zfcp_adapter_mempool {
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mempool_t *erp_req;
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mempool_t *gid_pn_req;
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mempool_t *scsi_req;
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mempool_t *scsi_abort;
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mempool_t *status_read_req;
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mempool_t *sr_data;
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mempool_t *gid_pn;
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mempool_t *qtcb_pool;
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};
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struct zfcp_adapter {
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struct kref ref;
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u64 peer_wwnn; /* P2P peer WWNN */
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u64 peer_wwpn; /* P2P peer WWPN */
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u32 peer_d_id; /* P2P peer D_ID */
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struct ccw_device *ccw_device; /* S/390 ccw device */
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struct zfcp_qdio *qdio;
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u32 hydra_version; /* Hydra version */
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u32 fsf_lic_version;
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u32 adapter_features; /* FCP channel features */
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u32 connection_features; /* host connection features */
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u32 hardware_version; /* of FCP channel */
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u16 timer_ticks; /* time int for a tick */
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struct Scsi_Host *scsi_host; /* Pointer to mid-layer */
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struct list_head port_list; /* remote port list */
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rwlock_t port_list_lock; /* port list lock */
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unsigned long req_no; /* unique FSF req number */
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struct zfcp_reqlist *req_list;
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u32 fsf_req_seq_no; /* FSF cmnd seq number */
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rwlock_t abort_lock; /* Protects against SCSI
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stack abort/command
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completion races */
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atomic_t stat_miss; /* # missing status reads*/
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unsigned int stat_read_buf_num;
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struct work_struct stat_work;
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atomic_t status; /* status of this adapter */
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struct list_head erp_ready_head; /* error recovery for this
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adapter/devices */
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wait_queue_head_t erp_ready_wq;
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struct list_head erp_running_head;
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rwlock_t erp_lock;
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wait_queue_head_t erp_done_wqh;
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struct zfcp_erp_action erp_action; /* pending error recovery */
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atomic_t erp_counter;
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u32 erp_total_count; /* total nr of enqueued erp
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actions */
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u32 erp_low_mem_count; /* nr of erp actions waiting
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for memory */
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struct task_struct *erp_thread;
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struct zfcp_fc_wka_ports *gs; /* generic services */
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struct zfcp_dbf *dbf; /* debug traces */
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struct zfcp_adapter_mempool pool; /* Adapter memory pools */
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struct fc_host_statistics *fc_stats;
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struct fsf_qtcb_bottom_port *stats_reset_data;
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unsigned long stats_reset;
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struct delayed_work scan_work;
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struct work_struct ns_up_work;
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struct service_level service_level;
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struct workqueue_struct *work_queue;
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struct device_dma_parameters dma_parms;
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struct zfcp_fc_events events;
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unsigned long next_port_scan;
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};
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struct zfcp_port {
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struct device dev;
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struct fc_rport *rport; /* rport of fc transport class */
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struct list_head list; /* list of remote ports */
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struct zfcp_adapter *adapter; /* adapter used to access port */
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struct list_head unit_list; /* head of logical unit list */
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rwlock_t unit_list_lock; /* unit list lock */
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atomic_t units; /* zfcp_unit count */
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atomic_t status; /* status of this remote port */
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u64 wwnn; /* WWNN if known */
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u64 wwpn; /* WWPN */
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u32 d_id; /* D_ID */
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u32 handle; /* handle assigned by FSF */
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struct zfcp_erp_action erp_action; /* pending error recovery */
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atomic_t erp_counter;
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u32 maxframe_size;
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u32 supported_classes;
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struct work_struct gid_pn_work;
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struct work_struct test_link_work;
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struct work_struct rport_work;
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enum { RPORT_NONE, RPORT_ADD, RPORT_DEL } rport_task;
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unsigned int starget_id;
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};
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struct zfcp_latency_record {
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u32 min;
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u32 max;
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u64 sum;
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};
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struct zfcp_latency_cont {
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struct zfcp_latency_record channel;
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struct zfcp_latency_record fabric;
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u64 counter;
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};
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struct zfcp_latencies {
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struct zfcp_latency_cont read;
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struct zfcp_latency_cont write;
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struct zfcp_latency_cont cmd;
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spinlock_t lock;
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};
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/**
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* struct zfcp_unit - LUN configured via zfcp sysfs
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* @dev: struct device for sysfs representation and reference counting
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* @list: entry in LUN/unit list per zfcp_port
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* @port: reference to zfcp_port where this LUN is configured
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* @fcp_lun: 64 bit LUN value
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* @scsi_work: for running scsi_scan_target
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*
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* This is the representation of a LUN that has been configured for
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* usage. The main data here is the 64 bit LUN value, data for
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* running I/O and recovery is in struct zfcp_scsi_dev.
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*/
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struct zfcp_unit {
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struct device dev;
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struct list_head list;
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struct zfcp_port *port;
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u64 fcp_lun;
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struct work_struct scsi_work;
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};
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/**
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* struct zfcp_scsi_dev - zfcp data per SCSI device
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* @status: zfcp internal status flags
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* @lun_handle: handle from "open lun" for issuing FSF requests
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* @erp_action: zfcp erp data for opening and recovering this LUN
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* @erp_counter: zfcp erp counter for this LUN
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* @latencies: FSF channel and fabric latencies
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* @port: zfcp_port where this LUN belongs to
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*/
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struct zfcp_scsi_dev {
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atomic_t status;
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u32 lun_handle;
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struct zfcp_erp_action erp_action;
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atomic_t erp_counter;
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struct zfcp_latencies latencies;
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struct zfcp_port *port;
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};
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/**
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* sdev_to_zfcp - Access zfcp LUN data for SCSI device
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* @sdev: scsi_device where to get the zfcp_scsi_dev pointer
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*/
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static inline struct zfcp_scsi_dev *sdev_to_zfcp(struct scsi_device *sdev)
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{
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return scsi_transport_device_data(sdev);
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}
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/**
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* zfcp_scsi_dev_lun - Return SCSI device LUN as 64 bit FCP LUN
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* @sdev: SCSI device where to get the LUN from
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*/
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static inline u64 zfcp_scsi_dev_lun(struct scsi_device *sdev)
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{
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u64 fcp_lun;
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int_to_scsilun(sdev->lun, (struct scsi_lun *)&fcp_lun);
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return fcp_lun;
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}
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/**
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* struct zfcp_fsf_req - basic FSF request structure
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* @list: list of FSF requests
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* @req_id: unique request ID
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* @adapter: adapter this request belongs to
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* @qdio_req: qdio queue related values
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* @completion: used to signal the completion of the request
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* @status: status of the request
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* @qtcb: associated QTCB
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* @data: private data
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* @timer: timer data of this request
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* @erp_action: reference to erp action if request issued on behalf of ERP
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* @pool: reference to memory pool if used for this request
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* @issued: time when request was send (STCK)
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* @handler: handler which should be called to process response
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*/
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struct zfcp_fsf_req {
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struct list_head list;
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unsigned long req_id;
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struct zfcp_adapter *adapter;
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struct zfcp_qdio_req qdio_req;
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struct completion completion;
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u32 status;
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struct fsf_qtcb *qtcb;
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void *data;
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struct timer_list timer;
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struct zfcp_erp_action *erp_action;
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mempool_t *pool;
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unsigned long long issued;
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void (*handler)(struct zfcp_fsf_req *);
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};
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static inline
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int zfcp_adapter_multi_buffer_active(struct zfcp_adapter *adapter)
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{
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return atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_MB_ACT;
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}
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static inline bool zfcp_fsf_req_is_status_read_buffer(struct zfcp_fsf_req *req)
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{
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return req->qtcb == NULL;
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}
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#endif /* ZFCP_DEF_H */
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