zfcp_dbf.h

/*
 * This file is part of the zfcp device driver for
 * FCP adapters for IBM System z9 and zSeries.
 *
 * Copyright IBM Corp. 2008, 2009
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#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_TAG_SIZE      4
#define ZFCP_DBF_ID_SIZE       7

#define ZFCP_DBF_INVALID_LUN	0xFFFFFFFFFFFFFFFFull

struct zfcp_dbf_dump {
	u8 tag[ZFCP_DBF_TAG_SIZE];
	u32 total_size;		/* size of total dump data */
	u32 offset;		/* how much data has being already dumped */
	u32 size;		/* how much data comes with this record */
	u8 data[];		/* dump data */
} __attribute__ ((packed));

/**
 * 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];
} __packed;

struct zfcp_dbf_hba_record_response {
	u32 fsf_command;
	u64 fsf_reqid;
	u32 fsf_seqno;
	u64 fsf_issued;
	u32 fsf_prot_status;
	u32 fsf_status;
	u8 fsf_prot_status_qual[FSF_PROT_STATUS_QUAL_SIZE];
	u8 fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
	u32 fsf_req_status;
	u8 sbal_first;
	u8 sbal_last;
	u8 sbal_response;
	u8 pool;
	u64 erp_action;
	union {
		struct {
			u64 cmnd;
			u32 data_dir;
		} fcp;
		struct {
			u64 wwpn;
			u32 d_id;
			u32 port_handle;
		} port;
		struct {
			u64 wwpn;
			u64 fcp_lun;
			u32 port_handle;
			u32 lun_handle;
		} unit;
		struct {
			u32 d_id;
		} els;
	} u;
} __attribute__ ((packed));

struct zfcp_dbf_hba_record_status {
	u8 failed;
	u32 status_type;
	u32 status_subtype;
	struct fsf_queue_designator
	 queue_designator;
	u32 payload_size;
#define ZFCP_DBF_UNSOL_PAYLOAD				80
#define ZFCP_DBF_UNSOL_PAYLOAD_SENSE_DATA_AVAIL		32
#define ZFCP_DBF_UNSOL_PAYLOAD_BIT_ERROR_THRESHOLD	56
#define ZFCP_DBF_UNSOL_PAYLOAD_FEATURE_UPDATE_ALERT	2 * sizeof(u32)
	u8 payload[ZFCP_DBF_UNSOL_PAYLOAD];
} __attribute__ ((packed));

struct zfcp_dbf_hba_record_qdio {
	u32 qdio_error;
	u8 sbal_index;
	u8 sbal_count;
} __attribute__ ((packed));

struct zfcp_dbf_hba_record {
	u8 tag[ZFCP_DBF_TAG_SIZE];
	u8 tag2[ZFCP_DBF_TAG_SIZE];
	union {
		struct zfcp_dbf_hba_record_response response;
		struct zfcp_dbf_hba_record_status status;
		struct zfcp_dbf_hba_record_qdio qdio;
		struct fsf_bit_error_payload berr;
	} u;
} __attribute__ ((packed));

struct zfcp_dbf_scsi_record {
	u8 tag[ZFCP_DBF_TAG_SIZE];
	u8 tag2[ZFCP_DBF_TAG_SIZE];
	u32 scsi_id;
	u32 scsi_lun;
	u32 scsi_result;
	u64 scsi_cmnd;
#define ZFCP_DBF_SCSI_OPCODE	16
	u8 scsi_opcode[ZFCP_DBF_SCSI_OPCODE];
	u8 scsi_retries;
	u8 scsi_allowed;
	u64 fsf_reqid;
	u32 fsf_seqno;
	u64 fsf_issued;
	u64 old_fsf_reqid;
	u8 rsp_validity;
	u8 rsp_scsi_status;
	u32 rsp_resid;
	u8 rsp_code;
#define ZFCP_DBF_SCSI_FCP_SNS_INFO	16
#define ZFCP_DBF_SCSI_MAX_FCP_SNS_INFO	256
	u32 sns_info_len;
	u8 sns_info[ZFCP_DBF_SCSI_FCP_SNS_INFO];
} __attribute__ ((packed));

struct zfcp_dbf {
	debug_info_t			*rec;
	debug_info_t			*hba;
	debug_info_t			*san;
	debug_info_t			*scsi;
	spinlock_t			rec_lock;
	spinlock_t			hba_lock;
	spinlock_t			san_lock;
	spinlock_t			scsi_lock;
	struct zfcp_dbf_rec		rec_buf;
	struct zfcp_dbf_hba_record	hba_buf;
	struct zfcp_dbf_san		san_buf;
	struct zfcp_dbf_scsi_record	scsi_buf;
	struct zfcp_adapter		*adapter;
};

static inline
void zfcp_dbf_hba_fsf_resp(const char *tag2, int level,
			   struct zfcp_fsf_req *req, struct zfcp_dbf *dbf)
{
	if (level <= dbf->hba->level)
		_zfcp_dbf_hba_fsf_response(tag2, level, req, dbf);
}

/**
 * zfcp_dbf_hba_fsf_response - trace event for request completion
 * @fsf_req: request that has been completed
 */
static inline void zfcp_dbf_hba_fsf_response(struct zfcp_fsf_req *req)
{
	struct zfcp_dbf *dbf = req->adapter->dbf;
	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("perr", 1, req, dbf);

	} else if (qtcb->header.fsf_status != FSF_GOOD) {
		zfcp_dbf_hba_fsf_resp("ferr", 1, req, dbf);

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

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

	} else {
		zfcp_dbf_hba_fsf_resp("norm", 6, req, dbf);
	}
 }

/**
 * zfcp_dbf_hba_fsf_unsol - trace event for an unsolicited status buffer
 * @tag: tag indicating which kind of unsolicited status has been received
 * @dbf: reference to dbf structure
 * @status_buffer: buffer containing payload of unsolicited status
 */
static inline
void zfcp_dbf_hba_fsf_unsol(const char *tag, struct zfcp_dbf *dbf,
			    struct fsf_status_read_buffer *buf)
{
	int level = 2;

	if (level <= dbf->hba->level)
		_zfcp_dbf_hba_fsf_unsol(tag, level, dbf, buf);
}

static inline
void zfcp_dbf_scsi(const char *tag, const char *tag2, int level,
		   struct zfcp_dbf *dbf, struct scsi_cmnd *scmd,
		   struct zfcp_fsf_req *req, unsigned long old_id)
{
	if (level <= dbf->scsi->level)
		_zfcp_dbf_scsi(tag, tag2, level, dbf, scmd, req, old_id);
}

/**
 * zfcp_dbf_scsi_result - trace event for SCSI command completion
 * @dbf: adapter dbf trace
 * @scmd: SCSI command pointer
 * @req: FSF request used to issue SCSI command
 */
static inline
void zfcp_dbf_scsi_result(struct zfcp_dbf *dbf, struct scsi_cmnd *scmd,
			  struct zfcp_fsf_req *req)
{
	if (scmd->result != 0)
		zfcp_dbf_scsi("rslt", "erro", 3, dbf, scmd, req, 0);
	else if (scmd->retries > 0)
		zfcp_dbf_scsi("rslt", "retr", 4, dbf, scmd, req, 0);
	else
		zfcp_dbf_scsi("rslt", "norm", 6, dbf, scmd, req, 0);
}

/**
 * zfcp_dbf_scsi_fail_send - trace event for failure to send SCSI command
 * @dbf: adapter dbf trace
 * @scmd: SCSI command pointer
 */
static inline
void zfcp_dbf_scsi_fail_send(struct zfcp_dbf *dbf, struct scsi_cmnd *scmd)
{
	zfcp_dbf_scsi("rslt", "fail", 4, dbf, scmd, NULL, 0);
}

/**
 * zfcp_dbf_scsi_abort - trace event for SCSI command abort
 * @tag: tag indicating success or failure of abort operation
 * @adapter: adapter thas has been used to issue SCSI command to be aborted
 * @scmd: SCSI command to be aborted
 * @new_req: request containing abort (might be NULL)
 * @old_id: identifier of request containg SCSI command to be aborted
 */
static inline
void zfcp_dbf_scsi_abort(const char *tag, struct zfcp_dbf *dbf,
			 struct scsi_cmnd *scmd, struct zfcp_fsf_req *new_req,
			 unsigned long old_id)
{
	zfcp_dbf_scsi("abrt", tag, 1, dbf, scmd, new_req, old_id);
}

/**
 * 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(const char *tag, struct scsi_cmnd *scmnd, u8 flag)
{
	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scmnd->device);

	zfcp_dbf_scsi(flag == FCP_TMF_TGT_RESET ? "trst" : "lrst", tag, 1,
		      zfcp_sdev->port->adapter->dbf, scmnd, NULL, 0);
}

#endif /* ZFCP_DBF_H */