/*
 * zfcp device driver
 * debug feature declarations
 *
 * Copyright IBM Corp. 2008, 2016
 */

#ifndef ZFCP_DBF_H
#define ZFCP_DBF_H

#include <scsi/fc/fc_fcp.h>
#include "zfcp_ext.h"
#include "zfcp_fsf.h"
#include "zfcp_def.h"

#define ZFCP_DBF_TAG_LEN       7

#define ZFCP_DBF_INVALID_LUN    0xFFFFFFFFFFFFFFFFull

enum zfcp_dbf_pseudo_erp_act_type {
        ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD = 0xff,
        ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL = 0xfe,
};

/**
 * struct zfcp_dbf_rec_trigger - trace record for triggered recovery action
 * @ready: number of ready recovery actions
 * @running: number of running recovery actions
 * @want: wanted recovery action
 * @need: needed recovery action
 */
struct zfcp_dbf_rec_trigger {
        u32 ready;
        u32 running;
        u8 want;
        u8 need;
} __packed;

/**
 * struct zfcp_dbf_rec_running - trace record for running recovery
 * @fsf_req_id: request id for fsf requests
 * @rec_status: status of the fsf request
 * @rec_step: current step of the recovery action
 * rec_count: recovery counter
 */
struct zfcp_dbf_rec_running {
        u64 fsf_req_id;
        u32 rec_status;
        u16 rec_step;
        u8 rec_action;
        u8 rec_count;
} __packed;

/**
 * enum zfcp_dbf_rec_id - recovery trace record id
 * @ZFCP_DBF_REC_TRIG: triggered recovery identifier
 * @ZFCP_DBF_REC_RUN: running recovery identifier
 */
enum zfcp_dbf_rec_id {
        ZFCP_DBF_REC_TRIG       = 1,
        ZFCP_DBF_REC_RUN        = 2,
};

/**
 * struct zfcp_dbf_rec - trace record for error recovery actions
 * @id: unique number of recovery record type
 * @tag: identifier string specifying the location of initiation
 * @lun: logical unit number
 * @wwpn: word wide port number
 * @d_id: destination ID
 * @adapter_status: current status of the adapter
 * @port_status: current status of the port
 * @lun_status: current status of the lun
 * @u.trig: structure zfcp_dbf_rec_trigger
 * @u.run: structure zfcp_dbf_rec_running
 */
struct zfcp_dbf_rec {
        u8 id;
        char tag[ZFCP_DBF_TAG_LEN];
        u64 lun;
        u64 wwpn;
        u32 d_id;
        u32 adapter_status;
        u32 port_status;
        u32 lun_status;
        union {
                struct zfcp_dbf_rec_trigger trig;
                struct zfcp_dbf_rec_running run;
        } u;
} __packed;

/**
 * enum zfcp_dbf_san_id - SAN trace record identifier
 * @ZFCP_DBF_SAN_REQ: request trace record id
 * @ZFCP_DBF_SAN_RES: response trace record id
 * @ZFCP_DBF_SAN_ELS: extended link service record id
 */
enum zfcp_dbf_san_id {
        ZFCP_DBF_SAN_REQ        = 1,
        ZFCP_DBF_SAN_RES        = 2,
        ZFCP_DBF_SAN_ELS        = 3,
};

/** struct zfcp_dbf_san - trace record for SAN requests and responses
 * @id: unique number of recovery record type
 * @tag: identifier string specifying the location of initiation
 * @fsf_req_id: request id for fsf requests
 * @payload: unformatted information related to request/response
 * @d_id: destination id
 */
struct zfcp_dbf_san {
        u8 id;
        char tag[ZFCP_DBF_TAG_LEN];
        u64 fsf_req_id;
        u32 d_id;
#define ZFCP_DBF_SAN_MAX_PAYLOAD (FC_CT_HDR_LEN + 32)
        char payload[ZFCP_DBF_SAN_MAX_PAYLOAD];
        u16 pl_len;
} __packed;

/**
 * struct zfcp_dbf_hba_res - trace record for hba responses
 * @req_issued: timestamp when request was issued
 * @prot_status: protocol status
 * @prot_status_qual: protocol status qualifier
 * @fsf_status: fsf status
 * @fsf_status_qual: fsf status qualifier
 */
struct zfcp_dbf_hba_res {
        u64 req_issued;
        u32 prot_status;
        u8  prot_status_qual[FSF_PROT_STATUS_QUAL_SIZE];
        u32 fsf_status;
        u8  fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
        u32 port_handle;
        u32 lun_handle;
} __packed;

/**
 * struct zfcp_dbf_hba_uss - trace record for unsolicited status
 * @status_type: type of unsolicited status
 * @status_subtype: subtype of unsolicited status
 * @d_id: destination ID
 * @lun: logical unit number
 * @queue_designator: queue designator
 */
struct zfcp_dbf_hba_uss {
        u32 status_type;
        u32 status_subtype;
        u32 d_id;
        u64 lun;
        u64 queue_designator;
} __packed;

/**
 * enum zfcp_dbf_hba_id - HBA trace record identifier
 * @ZFCP_DBF_HBA_RES: response trace record
 * @ZFCP_DBF_HBA_USS: unsolicited status trace record
 * @ZFCP_DBF_HBA_BIT: bit error trace record
 */
enum zfcp_dbf_hba_id {
        ZFCP_DBF_HBA_RES        = 1,
        ZFCP_DBF_HBA_USS        = 2,
        ZFCP_DBF_HBA_BIT        = 3,
        ZFCP_DBF_HBA_BASIC      = 4,
};

/**
 * struct zfcp_dbf_hba - common trace record for HBA records
 * @id: unique number of recovery record type
 * @tag: identifier string specifying the location of initiation
 * @fsf_req_id: request id for fsf requests
 * @fsf_req_status: status of fsf request
 * @fsf_cmd: fsf command
 * @fsf_seq_no: fsf sequence number
 * @pl_len: length of payload stored as zfcp_dbf_pay
 * @u: record type specific data
 */
struct zfcp_dbf_hba {
        u8 id;
        char tag[ZFCP_DBF_TAG_LEN];
        u64 fsf_req_id;
        u32 fsf_req_status;
        u32 fsf_cmd;
        u32 fsf_seq_no;
        u16 pl_len;
        union {
                struct zfcp_dbf_hba_res res;
                struct zfcp_dbf_hba_uss uss;
                struct fsf_bit_error_payload be;
        } u;
} __packed;

/**
 * enum zfcp_dbf_scsi_id - scsi trace record identifier
 * @ZFCP_DBF_SCSI_CMND: scsi command trace record
 */
enum zfcp_dbf_scsi_id {
        ZFCP_DBF_SCSI_CMND      = 1,
};

/**
 * struct zfcp_dbf_scsi - common trace record for SCSI records
 * @id: unique number of recovery record type
 * @tag: identifier string specifying the location of initiation
 * @scsi_id: scsi device id
 * @scsi_lun: scsi device logical unit number
 * @scsi_result: scsi result
 * @scsi_retries: current retry number of scsi request
 * @scsi_allowed: allowed retries
 * @fcp_rsp_info: FCP response info
 * @scsi_opcode: scsi opcode
 * @fsf_req_id: request id of fsf request
 * @host_scribble: LLD specific data attached to SCSI request
 * @pl_len: length of paload stored as zfcp_dbf_pay
 * @fsf_rsp: response for fsf request
 */
struct zfcp_dbf_scsi {
        u8 id;
        char tag[ZFCP_DBF_TAG_LEN];
        u32 scsi_id;
        u32 scsi_lun;
        u32 scsi_result;
        u8 scsi_retries;
        u8 scsi_allowed;
        u8 fcp_rsp_info;
#define ZFCP_DBF_SCSI_OPCODE    16
        u8 scsi_opcode[ZFCP_DBF_SCSI_OPCODE];
        u64 fsf_req_id;
        u64 host_scribble;
        u16 pl_len;
        struct fcp_resp_with_ext fcp_rsp;
} __packed;

/**
 * struct zfcp_dbf_pay - trace record for unformatted payload information
 * @area: area this record is originated from
 * @counter: ascending record number
 * @fsf_req_id: request id of fsf request
 * @data: unformatted data
 */
struct zfcp_dbf_pay {
        u8 counter;
        char area[ZFCP_DBF_TAG_LEN];
        u64 fsf_req_id;
#define ZFCP_DBF_PAY_MAX_REC 0x100
        char data[ZFCP_DBF_PAY_MAX_REC];
} __packed;

/**
 * struct zfcp_dbf - main dbf trace structure
 * @pay: reference to payload trace area
 * @rec: reference to recovery trace area
 * @hba: reference to hba trace area
 * @san: reference to san trace area
 * @scsi: reference to scsi trace area
 * @pay_lock: lock protecting payload trace buffer
 * @rec_lock: lock protecting recovery trace buffer
 * @hba_lock: lock protecting hba trace buffer
 * @san_lock: lock protecting san trace buffer
 * @scsi_lock: lock protecting scsi trace buffer
 * @pay_buf: pre-allocated buffer for payload
 * @rec_buf: pre-allocated buffer for recovery
 * @hba_buf: pre-allocated buffer for hba
 * @san_buf: pre-allocated buffer for san
 * @scsi_buf: pre-allocated buffer for scsi
 */
struct zfcp_dbf {
        debug_info_t                    *pay;
        debug_info_t                    *rec;
        debug_info_t                    *hba;
        debug_info_t                    *san;
        debug_info_t                    *scsi;
        spinlock_t                      pay_lock;
        spinlock_t                      rec_lock;
        spinlock_t                      hba_lock;
        spinlock_t                      san_lock;
        spinlock_t                      scsi_lock;
        struct zfcp_dbf_pay             pay_buf;
        struct zfcp_dbf_rec             rec_buf;
        struct zfcp_dbf_hba             hba_buf;
        struct zfcp_dbf_san             san_buf;
        struct zfcp_dbf_scsi            scsi_buf;
};

/**
 * zfcp_dbf_hba_fsf_resp_suppress - true if we should not trace by default
 * @req: request that has been completed
 *
 * Returns true if FCP response with only benign residual under count.
 */
static inline
bool zfcp_dbf_hba_fsf_resp_suppress(struct zfcp_fsf_req *req)
{
        struct fsf_qtcb *qtcb = req->qtcb;
        u32 fsf_stat = qtcb->header.fsf_status;
        struct fcp_resp *fcp_rsp;
        u8 rsp_flags, fr_status;

        if (qtcb->prefix.qtcb_type != FSF_IO_COMMAND)
                return false; /* not an FCP response */
        fcp_rsp = (struct fcp_resp *)&qtcb->bottom.io.fcp_rsp;
        rsp_flags = fcp_rsp->fr_flags;
        fr_status = fcp_rsp->fr_status;
        return (fsf_stat == FSF_FCP_RSP_AVAILABLE) &&
                (rsp_flags == FCP_RESID_UNDER) &&
                (fr_status == SAM_STAT_GOOD);
}

static inline
void zfcp_dbf_hba_fsf_resp(char *tag, int level, struct zfcp_fsf_req *req)
{
        if (debug_level_enabled(req->adapter->dbf->hba, level))
                zfcp_dbf_hba_fsf_res(tag, level, req);
}

/**
 * zfcp_dbf_hba_fsf_response - trace event for request completion
 * @req: request that has been completed
 */
static inline
void zfcp_dbf_hba_fsf_response(struct zfcp_fsf_req *req)
{
        struct fsf_qtcb *qtcb = req->qtcb;

        if ((qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
            (qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
                zfcp_dbf_hba_fsf_resp("fs_perr", 1, req);

        } else if (qtcb->header.fsf_status != FSF_GOOD) {
                zfcp_dbf_hba_fsf_resp("fs_ferr",
                                      zfcp_dbf_hba_fsf_resp_suppress(req)
                                      ? 5 : 1, req);

        } else if ((req->fsf_command == FSF_QTCB_OPEN_PORT_WITH_DID) ||
                   (req->fsf_command == FSF_QTCB_OPEN_LUN)) {
                zfcp_dbf_hba_fsf_resp("fs_open", 4, req);

        } else if (qtcb->header.log_length) {
                zfcp_dbf_hba_fsf_resp("fs_qtcb", 5, req);

        } else {
                zfcp_dbf_hba_fsf_resp("fs_norm", 6, req);
        }
}

static inline
void _zfcp_dbf_scsi(char *tag, int level, struct scsi_cmnd *scmd,
                   struct zfcp_fsf_req *req)
{
        struct zfcp_adapter *adapter = (struct zfcp_adapter *)
                                        scmd->device->host->hostdata[0];

        if (debug_level_enabled(adapter->dbf->scsi, level))
                zfcp_dbf_scsi(tag, level, scmd, req);
}

/**
 * zfcp_dbf_scsi_result - trace event for SCSI command completion
 * @scmd: SCSI command pointer
 * @req: FSF request used to issue SCSI command
 */
static inline
void zfcp_dbf_scsi_result(struct scsi_cmnd *scmd, struct zfcp_fsf_req *req)
{
        if (scmd->result != 0)
                _zfcp_dbf_scsi("rsl_err", 3, scmd, req);
        else if (scmd->retries > 0)
                _zfcp_dbf_scsi("rsl_ret", 4, scmd, req);
        else
                _zfcp_dbf_scsi("rsl_nor", 6, scmd, req);
}

/**
 * zfcp_dbf_scsi_fail_send - trace event for failure to send SCSI command
 * @scmd: SCSI command pointer
 */
static inline
void zfcp_dbf_scsi_fail_send(struct scsi_cmnd *scmd)
{
        _zfcp_dbf_scsi("rsl_fai", 4, scmd, NULL);
}

/**
 * zfcp_dbf_scsi_abort - trace event for SCSI command abort
 * @tag: tag indicating success or failure of abort operation
 * @scmd: SCSI command to be aborted
 * @fsf_req: request containing abort (might be NULL)
 */
static inline
void zfcp_dbf_scsi_abort(char *tag, struct scsi_cmnd *scmd,
                         struct zfcp_fsf_req *fsf_req)
{
        _zfcp_dbf_scsi(tag, 1, scmd, fsf_req);
}

/**
 * zfcp_dbf_scsi_devreset - trace event for Logical Unit or Target Reset
 * @tag: tag indicating success or failure of reset operation
 * @scmnd: SCSI command which caused this error recovery
 * @flag: indicates type of reset (Target Reset, Logical Unit Reset)
 */
static inline
void zfcp_dbf_scsi_devreset(char *tag, struct scsi_cmnd *scmnd, u8 flag)
{
        char tmp_tag[ZFCP_DBF_TAG_LEN];

        if (flag == FCP_TMF_TGT_RESET)
                memcpy(tmp_tag, "tr_", 3);
        else
                memcpy(tmp_tag, "lr_", 3);

        memcpy(&tmp_tag[3], tag, 4);
        _zfcp_dbf_scsi(tmp_tag, 1, scmnd, NULL);
}

/**
 * zfcp_dbf_scsi_nullcmnd() - trace NULLify of SCSI command in dev/tgt-reset.
 * @scmnd: SCSI command that was NULLified.
 * @fsf_req: request that owned @scmnd.
 */
static inline void zfcp_dbf_scsi_nullcmnd(struct scsi_cmnd *scmnd,
                                          struct zfcp_fsf_req *fsf_req)
{
        _zfcp_dbf_scsi("scfc__1", 3, scmnd, fsf_req);
}

#endif /* ZFCP_DBF_H */