自学教程：C++ CIO_HEX_EVENT函数代码示例

/* * Function: cio_cancel * Issues a "Cancel Subchannel" on the specified subchannel * Note: We don't need any fancy intparms and flags here *	 since xsch is executed synchronously. * Only for common I/O internal use as for now. */intcio_cancel (struct subchannel *sch){	int ccode;	if (!sch)		return -ENODEV;	CIO_TRACE_EVENT(2, "cancelIO");	CIO_TRACE_EVENT(2, dev_name(&sch->dev));	ccode = xsch (sch->schid);	CIO_HEX_EVENT(2, &ccode, sizeof(ccode));	switch (ccode) {	case 0:		/* success */		/* Update information in scsw. */		if (cio_update_schib(sch))			return -ENODEV;		return 0;	case 1:		/* status pending */		return -EBUSY;	case 2:		/* not applicable */		return -EINVAL;	default:	/* not oper */		return -ENODEV;	}}

/* * resume suspended I/O operation */intcio_resume (struct subchannel *sch){	int ccode;	CIO_TRACE_EVENT(4, "resIO");	CIO_TRACE_EVENT(4, dev_name(&sch->dev));	ccode = rsch (sch->schid);	CIO_HEX_EVENT(4, &ccode, sizeof(ccode));	switch (ccode) {	case 0:		sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND;		return 0;	case 1:		return -EBUSY;	case 2:		return -EINVAL;	default:		/*		 * useless to wait for request completion		 *  as device is no longer operational !		 */		return -ENODEV;	}}

/** * cio_disable_subchannel - disable a subchannel. * @sch: subchannel to disable */int cio_disable_subchannel(struct subchannel *sch){	int retry;	int ret;	CIO_TRACE_EVENT(2, "dissch");	CIO_TRACE_EVENT(2, dev_name(&sch->dev));	if (sch_is_pseudo_sch(sch))		return 0;	if (cio_update_schib(sch))		return -ENODEV;	sch->config.ena = 0;	for (retry = 0; retry < 3; retry++) {		ret = cio_commit_config(sch);		if (ret == -EBUSY) {			struct irb irb;			if (tsch(sch->schid, &irb) != 0)				break;		} else			break;	}	CIO_HEX_EVENT(2, &ret, sizeof(ret));	return ret;}

/* * Clear I/O operation */intcio_clear(struct subchannel *sch){	int ccode;	if (!sch)		return -ENODEV;	CIO_TRACE_EVENT(2, "clearIO");	CIO_TRACE_EVENT(2, dev_name(&sch->dev));	/*	 * Issue "Clear subchannel" and process condition code	 */	ccode = csch (sch->schid);	CIO_HEX_EVENT(2, &ccode, sizeof(ccode));	switch (ccode) {	case 0:		sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND;		return 0;	default:		/* device not operational */		return -ENODEV;	}}

intcio_cancel (struct subchannel *sch){	int ccode;	if (!sch)		return -ENODEV;	CIO_TRACE_EVENT(2, "cancelIO");	CIO_TRACE_EVENT(2, dev_name(&sch->dev));	ccode = xsch (sch->schid);	CIO_HEX_EVENT(2, &ccode, sizeof(ccode));	switch (ccode) {	case 0:						if (cio_update_schib(sch))			return -ENODEV;		return 0;	case 1:				return -EBUSY;	case 2:				return -EINVAL;	default:			return -ENODEV;	}}

int cio_enable_subchannel(struct subchannel *sch, u32 intparm){	int retry;	int ret;	CIO_TRACE_EVENT(2, "ensch");	CIO_TRACE_EVENT(2, dev_name(&sch->dev));	if (sch_is_pseudo_sch(sch))		return -EINVAL;	if (cio_update_schib(sch))		return -ENODEV;	sch->config.ena = 1;	sch->config.isc = sch->isc;	sch->config.intparm = intparm;	for (retry = 0; retry < 3; retry++) {		ret = cio_commit_config(sch);		if (ret == -EIO) {			sch->config.csense = 0;		} else if (ret == -EBUSY) {			struct irb irb;			if (tsch(sch->schid, &irb) != 0)				break;		} else			break;	}	CIO_HEX_EVENT(2, &ret, sizeof(ret));	return ret;}

/** * cio_enable_subchannel - enable a subchannel. * @sch: subchannel to be enabled * @intparm: interruption parameter to set */int cio_enable_subchannel(struct subchannel *sch, u32 intparm){	int ret;	CIO_TRACE_EVENT(2, "ensch");	CIO_TRACE_EVENT(2, dev_name(&sch->dev));	if (sch_is_pseudo_sch(sch))		return -EINVAL;	if (cio_update_schib(sch))		return -ENODEV;	sch->config.ena = 1;	sch->config.isc = sch->isc;	sch->config.intparm = intparm;	ret = cio_commit_config(sch);	if (ret == -EIO) {		/*		 * Got a program check in msch. Try without		 * the concurrent sense bit the next time.		 */		sch->config.csense = 0;		ret = cio_commit_config(sch);	}	CIO_HEX_EVENT(2, &ret, sizeof(ret));	return ret;}

intcio_halt(struct subchannel *sch){	int ccode;	if (!sch)		return -ENODEV;	CIO_TRACE_EVENT(2, "haltIO");	CIO_TRACE_EVENT(2, dev_name(&sch->dev));	ccode = hsch (sch->schid);	CIO_HEX_EVENT(2, &ccode, sizeof(ccode));	switch (ccode) {	case 0:		sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND;		return 0;	case 1:			case 2:				return -EBUSY;	default:				return -ENODEV;	}}

/* * halt I/O operation */intcio_halt(struct subchannel *sch){	int ccode;	if (!sch)		return -ENODEV;	CIO_TRACE_EVENT(2, "haltIO");	CIO_TRACE_EVENT(2, dev_name(&sch->dev));	/*	 * Issue "Halt subchannel" and process condition code	 */	ccode = hsch (sch->schid);	CIO_HEX_EVENT(2, &ccode, sizeof(ccode));	switch (ccode) {	case 0:		sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND;		return 0;	case 1:		/* status pending */	case 2:		/* busy */		return -EBUSY;	default:		/* device not operational */		return -ENODEV;	}}

intcio_start_key (struct subchannel *sch,	/* subchannel structure */	       struct ccw1 * cpa,	/* logical channel prog addr */	       __u8 lpm,		/* logical path mask */	       __u8 key)                /* storage key */{	struct io_subchannel_private *priv = to_io_private(sch);	union orb *orb = &priv->orb;	int ccode;	CIO_TRACE_EVENT(5, "stIO");	CIO_TRACE_EVENT(5, dev_name(&sch->dev));	memset(orb, 0, sizeof(union orb));	/* sch is always under 2G. */	orb->cmd.intparm = (u32)(addr_t)sch;	orb->cmd.fmt = 1;	orb->cmd.pfch = priv->options.prefetch == 0;	orb->cmd.spnd = priv->options.suspend;	orb->cmd.ssic = priv->options.suspend && priv->options.inter;	orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm;#ifdef CONFIG_64BIT	/*	 * for 64 bit we always support 64 bit IDAWs with 4k page size only	 */	orb->cmd.c64 = 1;	orb->cmd.i2k = 0;#endif	orb->cmd.key = key >> 4;	/* issue "Start Subchannel" */	orb->cmd.cpa = (__u32) __pa(cpa);	ccode = ssch(sch->schid, orb);	/* process condition code */	CIO_HEX_EVENT(5, &ccode, sizeof(ccode));	switch (ccode) {	case 0:		/*		 * initialize device status information		 */		sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND;		return 0;	case 1:		/* status pending */	case 2:		/* busy */		return -EBUSY;	case 3:		/* device/path not operational */		return cio_start_handle_notoper(sch, lpm);	default:		return ccode;	}}

intcio_start_key (struct subchannel *sch,		       struct ccw1 * cpa,		       __u8 lpm,			       __u8 key)                {	struct io_subchannel_private *priv = to_io_private(sch);	union orb *orb = &priv->orb;	int ccode;	CIO_TRACE_EVENT(5, "stIO");	CIO_TRACE_EVENT(5, dev_name(&sch->dev));	memset(orb, 0, sizeof(union orb));		orb->cmd.intparm = (u32)(addr_t)sch;	orb->cmd.fmt = 1;	orb->cmd.pfch = priv->options.prefetch == 0;	orb->cmd.spnd = priv->options.suspend;	orb->cmd.ssic = priv->options.suspend && priv->options.inter;	orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm;#ifdef CONFIG_64BIT	orb->cmd.c64 = 1;	orb->cmd.i2k = 0;#endif	orb->cmd.key = key >> 4;		orb->cmd.cpa = (__u32) __pa(cpa);	ccode = ssch(sch->schid, orb);		CIO_HEX_EVENT(5, &ccode, sizeof(ccode));	switch (ccode) {	case 0:		sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND;		return 0;	case 1:			case 2:				return -EBUSY;	case 3:				return cio_start_handle_notoper(sch, lpm);	default:		return ccode;	}}

/** * cio_disable_subchannel - disable a subchannel. * @sch: subchannel to disable */int cio_disable_subchannel(struct subchannel *sch){	int ret;	CIO_TRACE_EVENT(2, "dissch");	CIO_TRACE_EVENT(2, dev_name(&sch->dev));	if (sch_is_pseudo_sch(sch))		return 0;	if (cio_update_schib(sch))		return -ENODEV;	sch->config.ena = 0;	ret = cio_commit_config(sch);	CIO_HEX_EVENT(2, &ret, sizeof(ret));	return ret;}

static enum io_status ccwreq_status(struct ccw_device *cdev, struct irb *lcirb){	struct irb *irb = &cdev->private->irb;	struct cmd_scsw *scsw = &irb->scsw.cmd;	enum uc_todo todo;		if (ccw_device_accumulate_and_sense(cdev, lcirb))		return IO_RUNNING;		if (scsw->fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC))		return IO_KILLED;		if (scsw->cc == 3 || scsw->pno)		return IO_PATH_ERROR;		if (irb->esw.esw0.erw.cons) {		CIO_TRACE_EVENT(2, "sensedata");		CIO_HEX_EVENT(2, &cdev->private->dev_id,			      sizeof(struct ccw_dev_id));		CIO_HEX_EVENT(2, &cdev->private->irb.ecw, SENSE_MAX_COUNT);				if (irb->ecw[0] & SNS0_CMD_REJECT)			return IO_REJECTED;				if (cdev->drv && cdev->drv->uc_handler) {			todo = cdev->drv->uc_handler(cdev, lcirb);			CIO_TRACE_EVENT(2, "uc_response");			CIO_HEX_EVENT(2, &todo, sizeof(todo));			switch (todo) {			case UC_TODO_RETRY:				return IO_STATUS_ERROR;			case UC_TODO_RETRY_ON_NEW_PATH:				return IO_PATH_ERROR;			case UC_TODO_STOP:				return IO_REJECTED;			default:				return IO_STATUS_ERROR;			}		}				return IO_STATUS_ERROR;	}

/* * Return the status of the internal I/O started on the specified ccw device. * Perform BASIC SENSE if required. */static enum io_status ccwreq_status(struct ccw_device *cdev, struct irb *lcirb){	struct irb *irb = &cdev->private->irb;	struct cmd_scsw *scsw = &irb->scsw.cmd;	enum uc_todo todo;	/* Perform BASIC SENSE if needed. */	if (ccw_device_accumulate_and_sense(cdev, lcirb))		return IO_RUNNING;	/* Check for halt/clear interrupt. */	if (scsw->fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC))		return IO_KILLED;	/* Check for path error. */	if (scsw->cc == 3 || scsw->pno)		return IO_PATH_ERROR;	/* Handle BASIC SENSE data. */	if (irb->esw.esw0.erw.cons) {		CIO_TRACE_EVENT(2, "sensedata");		CIO_HEX_EVENT(2, &cdev->private->dev_id,			      sizeof(struct ccw_dev_id));		CIO_HEX_EVENT(2, &cdev->private->irb.ecw, SENSE_MAX_COUNT);		/* Check for command reject. */		if (irb->ecw[0] & SNS0_CMD_REJECT)			return IO_REJECTED;		/* Ask the driver what to do */		if (cdev->drv && cdev->drv->uc_handler) {			todo = cdev->drv->uc_handler(cdev, lcirb);			CIO_TRACE_EVENT(2, "uc_response");			CIO_HEX_EVENT(2, &todo, sizeof(todo));			switch (todo) {			case UC_TODO_RETRY:				return IO_STATUS_ERROR;			case UC_TODO_RETRY_ON_NEW_PATH:				return IO_PATH_ERROR;			case UC_TODO_STOP:				return IO_REJECTED;			default:				return IO_STATUS_ERROR;			}		}		/* Assume that unexpected SENSE data implies an error. */		return IO_STATUS_ERROR;	}

static inline intcio_start_handle_notoper(struct subchannel *sch, __u8 lpm){	char dbf_text[15];	if (lpm != 0)		sch->lpm &= ~lpm;	else		sch->lpm = 0;	stsch (sch->irq, &sch->schib);	CIO_MSG_EVENT(0, "cio_start: 'not oper' status for "		      "subchannel %04x!/n", sch->irq);	sprintf(dbf_text, "no%s", sch->dev.bus_id);	CIO_TRACE_EVENT(0, dbf_text);	CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib));	return (sch->lpm ? -EACCES : -ENODEV);}

static intcio_start_handle_notoper(struct subchannel *sch, __u8 lpm){	char dbf_text[15];	if (lpm != 0)		sch->lpm &= ~lpm;	else		sch->lpm = 0;	stsch (sch->schid, &sch->schib);	CIO_MSG_EVENT(2, "cio_start: 'not oper' status for "		      "subchannel 0.%x.%04x!/n", sch->schid.ssid,		      sch->schid.sch_no);	sprintf(dbf_text, "no%s", dev_name(&sch->dev));	CIO_TRACE_EVENT(0, dbf_text);	CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib));	return (sch->lpm ? -EACCES : -ENODEV);}

/* * Check for any kind of channel or interface control check but don't * issue the message for the console device */static inline voidccw_device_msg_control_check(struct ccw_device *cdev, struct irb *irb){	if (!(irb->scsw.cstat & (SCHN_STAT_CHN_DATA_CHK |				 SCHN_STAT_CHN_CTRL_CHK |				 SCHN_STAT_INTF_CTRL_CHK)))		return;	CIO_MSG_EVENT(0, "Channel-Check or Interface-Control-Check "		      "received"		      " ... device %04x on subchannel 0.%x.%04x, dev_stat "		      ": %02X sch_stat : %02X/n",		      cdev->private->dev_id.devno, cdev->private->schid.ssid,		      cdev->private->schid.sch_no,		      irb->scsw.dstat, irb->scsw.cstat);	if (irb->scsw.cc != 3) {		char dbf_text[15];		sprintf(dbf_text, "chk%x", cdev->private->schid.sch_no);		CIO_TRACE_EVENT(0, dbf_text);		CIO_HEX_EVENT(0, irb, sizeof (struct irb));	}

intcio_clear(struct subchannel *sch){	int ccode;	if (!sch)		return -ENODEV;	CIO_TRACE_EVENT(2, "clearIO");	CIO_TRACE_EVENT(2, dev_name(&sch->dev));	ccode = csch (sch->schid);	CIO_HEX_EVENT(2, &ccode, sizeof(ccode));	switch (ccode) {	case 0:		sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND;		return 0;	default:				return -ENODEV;	}}

intcio_resume (struct subchannel *sch){	int ccode;	CIO_TRACE_EVENT(4, "resIO");	CIO_TRACE_EVENT(4, dev_name(&sch->dev));	ccode = rsch (sch->schid);	CIO_HEX_EVENT(4, &ccode, sizeof(ccode));	switch (ccode) {	case 0:		sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND;		return 0;	case 1:		return -EBUSY;	case 2:		return -EINVAL;	default:		return -ENODEV;	}}