diff --git a/drivers/s390/cio/blacklist.c b/drivers/s390/cio/blacklist.c
index a1c52a682191..a4b03031ff50 100644
--- a/drivers/s390/cio/blacklist.c
+++ b/drivers/s390/cio/blacklist.c
@@ -35,7 +35,7 @@
  */
 
 /* 65536 bits to indicate if a devno is blacklisted or not */
-#define __BL_DEV_WORDS ((__MAX_SUBCHANNELS + (8*sizeof(long) - 1)) / \
+#define __BL_DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
 			 (8*sizeof(long)))
 static unsigned long bl_dev[__BL_DEV_WORDS];
 typedef enum {add, free} range_action;
@@ -50,7 +50,7 @@ blacklist_range (range_action action, unsigned int from, unsigned int to)
 	if (!to)
 		to = from;
 
-	if (from > to || to > __MAX_SUBCHANNELS) {
+	if (from > to || to > __MAX_SUBCHANNEL) {
 		printk (KERN_WARNING "Invalid blacklist range "
 			"0x%04x to 0x%04x, skipping\n", from, to);
 		return;
@@ -143,7 +143,7 @@ blacklist_parse_parameters (char *str, range_action action)
 		if (strncmp(str,"all,",4) == 0 || strcmp(str,"all") == 0 ||
 		    strncmp(str,"all\n",4) == 0 || strncmp(str,"all ",4) == 0) {
 			from = 0;
-			to = __MAX_SUBCHANNELS;
+			to = __MAX_SUBCHANNEL;
 			str += 3;
 		} else {
 			int rc;
@@ -226,20 +226,21 @@ is_blacklisted (int devno)
 static inline void
 s390_redo_validation (void)
 {
-	unsigned int irq;
+	struct subchannel_id schid;
 
 	CIO_TRACE_EVENT (0, "redoval");
-	for (irq = 0; irq < __MAX_SUBCHANNELS; irq++) {
+	init_subchannel_id(&schid);
+	do {
 		int ret;
 		struct subchannel *sch;
 
-		sch = get_subchannel_by_schid(irq);
+		sch = get_subchannel_by_schid(schid);
 		if (sch) {
 			/* Already known. */
 			put_device(&sch->dev);
 			continue;
 		}
-		ret = css_probe_device(irq);
+		ret = css_probe_device(schid);
 		if (ret == -ENXIO)
 			break; /* We're through. */
 		if (ret == -ENOMEM)
@@ -248,7 +249,7 @@ s390_redo_validation (void)
 			 * panic.
 			 */
 			break;
-	}
+	} while (schid.sch_no++ < __MAX_SUBCHANNEL);
 }
 
 /*
@@ -289,12 +290,12 @@ static int cio_ignore_read (char *page, char **start, off_t off,
 	len = 0;
 	for (devno = off; /* abuse the page variable
 			   * as counter, see fs/proc/generic.c */
-	     devno < __MAX_SUBCHANNELS && len + entry_size < count; devno++) {
+	     devno < __MAX_SUBCHANNEL && len + entry_size < count; devno++) {
 		if (!test_bit(devno, bl_dev))
 			continue;
 		len += sprintf(page + len, "0.0.%04lx", devno);
 		if (test_bit(devno + 1, bl_dev)) { /* print range */
-			while (++devno < __MAX_SUBCHANNELS)
+			while (++devno < __MAX_SUBCHANNEL)
 				if (!test_bit(devno, bl_dev))
 					break;
 			len += sprintf(page + len, "-0.0.%04lx", --devno);
@@ -302,7 +303,7 @@ static int cio_ignore_read (char *page, char **start, off_t off,
 		len += sprintf(page + len, "\n");
 	}
 
-	if (devno < __MAX_SUBCHANNELS)
+	if (devno < __MAX_SUBCHANNEL)
 		*eof = 1;
 	*start = (char *) (devno - off); /* number of checked entries */
 	return len;
diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
index fa3c23b80e3a..aff5d149b729 100644
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -104,8 +104,8 @@ chsc_get_sch_desc_irq(struct subchannel *sch, void *page)
 		.code   = 0x0004,
 	};
 
-	ssd_area->f_sch = sch->irq;
-	ssd_area->l_sch = sch->irq;
+	ssd_area->f_sch = sch->schid.sch_no;
+	ssd_area->l_sch = sch->schid.sch_no;
 
 	ccode = chsc(ssd_area);
 	if (ccode > 0) {
@@ -147,7 +147,8 @@ chsc_get_sch_desc_irq(struct subchannel *sch, void *page)
 	 */
 	if (ssd_area->st > 3) { /* uhm, that looks strange... */
 		CIO_CRW_EVENT(0, "Strange subchannel type %d"
-			      " for sch %04x\n", ssd_area->st, sch->irq);
+			      " for sch %04x\n", ssd_area->st,
+			      sch->schid.sch_no);
 		/*
 		 * There may have been a new subchannel type defined in the
 		 * time since this code was written; since we don't know which
@@ -157,7 +158,7 @@ chsc_get_sch_desc_irq(struct subchannel *sch, void *page)
 	} else {
 		const char *type[4] = {"I/O", "chsc", "message", "ADM"};
 		CIO_CRW_EVENT(6, "ssd: sch %04x is %s subchannel\n",
-			      sch->irq, type[ssd_area->st]);
+			      sch->schid.sch_no, type[ssd_area->st]);
 
 		sch->ssd_info.valid = 1;
 		sch->ssd_info.type = ssd_area->st;
@@ -232,7 +233,7 @@ s390_subchannel_remove_chpid(struct device *dev, void *data)
 	mask = 0x80 >> j;
 	spin_lock(&sch->lock);
 
-	stsch(sch->irq, &schib);
+	stsch(sch->schid, &schib);
 	if (!schib.pmcw.dnv)
 		goto out_unreg;
 	memcpy(&sch->schib, &schib, sizeof(struct schib));
@@ -284,7 +285,7 @@ out_unlock:
 out_unreg:
 	spin_unlock(&sch->lock);
 	sch->lpm = 0;
-	if (css_enqueue_subchannel_slow(sch->irq)) {
+	if (css_enqueue_subchannel_slow(sch->schid)) {
 		css_clear_subchannel_slow_list();
 		need_rescan = 1;
 	}
@@ -337,7 +338,7 @@ s390_process_res_acc_sch(u8 chpid, __u16 fla, u32 fla_mask,
 	 * new path information and eventually check for logically
 	 * offline chpids.
 	 */
-	ccode = stsch(sch->irq, &sch->schib);
+	ccode = stsch(sch->schid, &sch->schib);
 	if (ccode > 0)
 		return 0;
 
@@ -348,7 +349,8 @@ static int
 s390_process_res_acc (u8 chpid, __u16 fla, u32 fla_mask)
 {
 	struct subchannel *sch;
-	int irq, rc;
+	int rc;
+	struct subchannel_id schid;
 	char dbf_txt[15];
 
 	sprintf(dbf_txt, "accpr%x", chpid);
@@ -370,10 +372,11 @@ s390_process_res_acc (u8 chpid, __u16 fla, u32 fla_mask)
 		return 0; /* no need to do the rest */
 
 	rc = 0;
-	for (irq = 0; irq < __MAX_SUBCHANNELS; irq++) {
+	init_subchannel_id(&schid);
+	do {
 		int chp_mask, old_lpm;
 
-		sch = get_subchannel_by_schid(irq);
+		sch = get_subchannel_by_schid(schid);
 		if (!sch) {
 			struct schib schib;
 			int ret;
@@ -385,7 +388,7 @@ s390_process_res_acc (u8 chpid, __u16 fla, u32 fla_mask)
 			 * that beast may be on we'll have to do a stsch
 			 * on all devices, grr...
 			 */
-			if (stsch(irq, &schib)) {
+			if (stsch(schid, &schib)) {
 				/* We're through */
 				if (need_rescan)
 					rc = -EAGAIN;
@@ -396,7 +399,7 @@ s390_process_res_acc (u8 chpid, __u16 fla, u32 fla_mask)
 				continue;
 			}
 			/* Put it on the slow path. */
-			ret = css_enqueue_subchannel_slow(irq);
+			ret = css_enqueue_subchannel_slow(schid);
 			if (ret) {
 				css_clear_subchannel_slow_list();
 				need_rescan = 1;
@@ -428,7 +431,7 @@ s390_process_res_acc (u8 chpid, __u16 fla, u32 fla_mask)
 		put_device(&sch->dev);
 		if (fla_mask == 0xffff)
 			break;
-	}
+	} while (schid.sch_no++ < __MAX_SUBCHANNEL);
 	return rc;
 }
 
@@ -608,7 +611,8 @@ static int
 chp_add(int chpid)
 {
 	struct subchannel *sch;
-	int irq, ret, rc;
+	int ret, rc;
+	struct subchannel_id schid;
 	char dbf_txt[15];
 
 	if (!get_chp_status(chpid))
@@ -618,14 +622,15 @@ chp_add(int chpid)
 	CIO_TRACE_EVENT(2, dbf_txt);
 
 	rc = 0;
-	for (irq = 0; irq < __MAX_SUBCHANNELS; irq++) {
+	init_subchannel_id(&schid);
+	do {
 		int i;
 
-		sch = get_subchannel_by_schid(irq);
+		sch = get_subchannel_by_schid(schid);
 		if (!sch) {
 			struct schib schib;
 
-			if (stsch(irq, &schib)) {
+			if (stsch(schid, &schib)) {
 				/* We're through */
 				if (need_rescan)
 					rc = -EAGAIN;
@@ -636,7 +641,7 @@ chp_add(int chpid)
 				continue;
 			}
 			/* Put it on the slow path. */
-			ret = css_enqueue_subchannel_slow(irq);
+			ret = css_enqueue_subchannel_slow(schid);
 			if (ret) {
 				css_clear_subchannel_slow_list();
 				need_rescan = 1;
@@ -648,7 +653,7 @@ chp_add(int chpid)
 		spin_lock(&sch->lock);
 		for (i=0; i<8; i++)
 			if (sch->schib.pmcw.chpid[i] == chpid) {
-				if (stsch(sch->irq, &sch->schib) != 0) {
+				if (stsch(sch->schid, &sch->schib) != 0) {
 					/* Endgame. */
 					spin_unlock(&sch->lock);
 					return rc;
@@ -669,7 +674,7 @@ chp_add(int chpid)
 
 		spin_unlock(&sch->lock);
 		put_device(&sch->dev);
-	}
+	} while (schid.sch_no++ < __MAX_SUBCHANNEL);
 	return rc;
 }
 
@@ -702,7 +707,7 @@ __check_for_io_and_kill(struct subchannel *sch, int index)
 	if (!device_is_online(sch))
 		/* cio could be doing I/O. */
 		return 0;
-	cc = stsch(sch->irq, &sch->schib);
+	cc = stsch(sch->schid, &sch->schib);
 	if (cc)
 		return 0;
 	if (sch->schib.scsw.actl && sch->schib.pmcw.lpum == (0x80 >> index)) {
@@ -743,7 +748,7 @@ __s390_subchannel_vary_chpid(struct subchannel *sch, __u8 chpid, int on)
 			 * just varied off path. Then kill it.
 			 */
 			if (!__check_for_io_and_kill(sch, chp) && !sch->lpm) {
-				if (css_enqueue_subchannel_slow(sch->irq)) {
+				if (css_enqueue_subchannel_slow(sch->schid)) {
 					css_clear_subchannel_slow_list();
 					need_rescan = 1;
 				}
@@ -789,7 +794,8 @@ static int
 s390_vary_chpid( __u8 chpid, int on)
 {
 	char dbf_text[15];
-	int status, irq, ret;
+	int status, ret;
+	struct subchannel_id schid;
 	struct subchannel *sch;
 
 	sprintf(dbf_text, on?"varyon%x":"varyoff%x", chpid);
@@ -818,26 +824,27 @@ s390_vary_chpid( __u8 chpid, int on)
 	if (!on)
 		goto out;
 	/* Scan for new devices on varied on path. */
-	for (irq = 0; irq < __MAX_SUBCHANNELS; irq++) {
+	init_subchannel_id(&schid);
+	do {
 		struct schib schib;
 
 		if (need_rescan)
 			break;
-		sch = get_subchannel_by_schid(irq);
+		sch = get_subchannel_by_schid(schid);
 		if (sch) {
 			put_device(&sch->dev);
 			continue;
 		}
-		if (stsch(irq, &schib))
+		if (stsch(schid, &schib))
 			/* We're through */
 			break;
 		/* Put it on the slow path. */
-		ret = css_enqueue_subchannel_slow(irq);
+		ret = css_enqueue_subchannel_slow(schid);
 		if (ret) {
 			css_clear_subchannel_slow_list();
 			need_rescan = 1;
 		}
-	}
+	} while (schid.sch_no++ < __MAX_SUBCHANNEL);
 out:
 	if (need_rescan || css_slow_subchannels_exist())
 		queue_work(slow_path_wq, &slow_path_work);
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index 185bc73c3ecd..396bada65f86 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -135,7 +135,7 @@ cio_tpi(void)
 		return 0;
 	irb = (struct irb *) __LC_IRB;
 	/* Store interrupt response block to lowcore. */
-	if (tsch (tpi_info->irq, irb) != 0)
+	if (tsch (tpi_info->schid, irb) != 0)
 		/* Not status pending or not operational. */
 		return 1;
 	sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
@@ -163,10 +163,10 @@ cio_start_handle_notoper(struct subchannel *sch, __u8 lpm)
 	else
 		sch->lpm = 0;
 
-	stsch (sch->irq, &sch->schib);
+	stsch (sch->schid, &sch->schib);
 
 	CIO_MSG_EVENT(0, "cio_start: 'not oper' status for "
-		      "subchannel %04x!\n", sch->irq);
+		      "subchannel %04x!\n", sch->schid.sch_no);
 	sprintf(dbf_text, "no%s", sch->dev.bus_id);
 	CIO_TRACE_EVENT(0, dbf_text);
 	CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib));
@@ -204,7 +204,7 @@ cio_start_key (struct subchannel *sch,	/* subchannel structure */
 	sch->orb.key = key >> 4;
 	/* issue "Start Subchannel" */
 	sch->orb.cpa = (__u32) __pa (cpa);
-	ccode = ssch (sch->irq, &sch->orb);
+	ccode = ssch (sch->schid, &sch->orb);
 
 	/* process condition code */
 	sprintf (dbf_txt, "ccode:%d", ccode);
@@ -243,7 +243,7 @@ cio_resume (struct subchannel *sch)
 	CIO_TRACE_EVENT (4, "resIO");
 	CIO_TRACE_EVENT (4, sch->dev.bus_id);
 
-	ccode = rsch (sch->irq);
+	ccode = rsch (sch->schid);
 
 	sprintf (dbf_txt, "ccode:%d", ccode);
 	CIO_TRACE_EVENT (4, dbf_txt);
@@ -283,7 +283,7 @@ cio_halt(struct subchannel *sch)
 	/*
 	 * Issue "Halt subchannel" and process condition code
 	 */
-	ccode = hsch (sch->irq);
+	ccode = hsch (sch->schid);
 
 	sprintf (dbf_txt, "ccode:%d", ccode);
 	CIO_TRACE_EVENT (2, dbf_txt);
@@ -318,7 +318,7 @@ cio_clear(struct subchannel *sch)
 	/*
 	 * Issue "Clear subchannel" and process condition code
 	 */
-	ccode = csch (sch->irq);
+	ccode = csch (sch->schid);
 
 	sprintf (dbf_txt, "ccode:%d", ccode);
 	CIO_TRACE_EVENT (2, dbf_txt);
@@ -351,7 +351,7 @@ cio_cancel (struct subchannel *sch)
 	CIO_TRACE_EVENT (2, "cancelIO");
 	CIO_TRACE_EVENT (2, sch->dev.bus_id);
 
-	ccode = xsch (sch->irq);
+	ccode = xsch (sch->schid);
 
 	sprintf (dbf_txt, "ccode:%d", ccode);
 	CIO_TRACE_EVENT (2, dbf_txt);
@@ -359,7 +359,7 @@ cio_cancel (struct subchannel *sch)
 	switch (ccode) {
 	case 0:		/* success */
 		/* Update information in scsw. */
-		stsch (sch->irq, &sch->schib);
+		stsch (sch->schid, &sch->schib);
 		return 0;
 	case 1:		/* status pending */
 		return -EBUSY;
@@ -381,7 +381,7 @@ cio_modify (struct subchannel *sch)
 
 	ret = 0;
 	for (retry = 0; retry < 5; retry++) {
-		ccode = msch_err (sch->irq, &sch->schib);
+		ccode = msch_err (sch->schid, &sch->schib);
 		if (ccode < 0)	/* -EIO if msch gets a program check. */
 			return ccode;
 		switch (ccode) {
@@ -414,7 +414,7 @@ cio_enable_subchannel (struct subchannel *sch, unsigned int isc)
 	CIO_TRACE_EVENT (2, "ensch");
 	CIO_TRACE_EVENT (2, sch->dev.bus_id);
 
-	ccode = stsch (sch->irq, &sch->schib);
+	ccode = stsch (sch->schid, &sch->schib);
 	if (ccode)
 		return -ENODEV;
 
@@ -432,13 +432,13 @@ cio_enable_subchannel (struct subchannel *sch, unsigned int isc)
 			 */
 			sch->schib.pmcw.csense = 0;
 		if (ret == 0) {
-			stsch (sch->irq, &sch->schib);
+			stsch (sch->schid, &sch->schib);
 			if (sch->schib.pmcw.ena)
 				break;
 		}
 		if (ret == -EBUSY) {
 			struct irb irb;
-			if (tsch(sch->irq, &irb) != 0)
+			if (tsch(sch->schid, &irb) != 0)
 				break;
 		}
 	}
@@ -461,7 +461,7 @@ cio_disable_subchannel (struct subchannel *sch)
 	CIO_TRACE_EVENT (2, "dissch");
 	CIO_TRACE_EVENT (2, sch->dev.bus_id);
 
-	ccode = stsch (sch->irq, &sch->schib);
+	ccode = stsch (sch->schid, &sch->schib);
 	if (ccode == 3)		/* Not operational. */
 		return -ENODEV;
 
@@ -485,7 +485,7 @@ cio_disable_subchannel (struct subchannel *sch)
 			 */
 			break;
 		if (ret == 0) {
-			stsch (sch->irq, &sch->schib);
+			stsch (sch->schid, &sch->schib);
 			if (!sch->schib.pmcw.ena)
 				break;
 		}
@@ -508,12 +508,12 @@ cio_disable_subchannel (struct subchannel *sch)
  *   -ENODEV for subchannels with invalid device number or blacklisted devices
  */
 int
-cio_validate_subchannel (struct subchannel *sch, unsigned int irq)
+cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
 {
 	char dbf_txt[15];
 	int ccode;
 
-	sprintf (dbf_txt, "valsch%x", irq);
+	sprintf (dbf_txt, "valsch%x", schid.sch_no);
 	CIO_TRACE_EVENT (4, dbf_txt);
 
 	/* Nuke all fields. */
@@ -522,17 +522,17 @@ cio_validate_subchannel (struct subchannel *sch, unsigned int irq)
 	spin_lock_init(&sch->lock);
 
 	/* Set a name for the subchannel */
-	snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.0.%04x", irq);
+	snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.0.%04x", schid.sch_no);
 
 	/*
 	 * The first subchannel that is not-operational (ccode==3)
 	 *  indicates that there aren't any more devices available.
 	 */
-	sch->irq = irq;
-	ccode = stsch (irq, &sch->schib);
+	ccode = stsch (schid, &sch->schib);
 	if (ccode)
 		return -ENXIO;
 
+	sch->schid = schid;
 	/* Copy subchannel type from path management control word. */
 	sch->st = sch->schib.pmcw.st;
 
@@ -543,7 +543,7 @@ cio_validate_subchannel (struct subchannel *sch, unsigned int irq)
 		CIO_DEBUG(KERN_INFO, 0,
 			  "Subchannel %04X reports "
 			  "non-I/O subchannel type %04X\n",
-			  sch->irq, sch->st);
+			  sch->schid.sch_no, sch->st);
 		/* We stop here for non-io subchannels. */
 		return sch->st;
 	}
@@ -573,7 +573,7 @@ cio_validate_subchannel (struct subchannel *sch, unsigned int irq)
 	CIO_DEBUG(KERN_INFO, 0,
 		  "Detected device %04X on subchannel %04X"
 		  " - PIM = %02X, PAM = %02X, POM = %02X\n",
-		  sch->schib.pmcw.dev, sch->irq, sch->schib.pmcw.pim,
+		  sch->schib.pmcw.dev, sch->schid.sch_no, sch->schib.pmcw.pim,
 		  sch->schib.pmcw.pam, sch->schib.pmcw.pom);
 
 	/*
@@ -632,7 +632,7 @@ do_IRQ (struct pt_regs *regs)
 		if (sch)
 			spin_lock(&sch->lock);
 		/* Store interrupt response block to lowcore. */
-		if (tsch (tpi_info->irq, irb) == 0 && sch) {
+		if (tsch (tpi_info->schid, irb) == 0 && sch) {
 			/* Keep subchannel information word up to date. */
 			memcpy (&sch->schib.scsw, &irb->scsw,
 				sizeof (irb->scsw));
@@ -693,26 +693,28 @@ wait_cons_dev (void)
 static int
 cio_console_irq(void)
 {
-	int irq;
+	struct subchannel_id schid;
 	
+	init_subchannel_id(&schid);
 	if (console_irq != -1) {
 		/* VM provided us with the irq number of the console. */
-		if (stsch(console_irq, &console_subchannel.schib) != 0 ||
+		schid.sch_no = console_irq;
+		if (stsch(schid, &console_subchannel.schib) != 0 ||
 		    !console_subchannel.schib.pmcw.dnv)
 			return -1;
 		console_devno = console_subchannel.schib.pmcw.dev;
 	} else if (console_devno != -1) {
 		/* At least the console device number is known. */
-		for (irq = 0; irq < __MAX_SUBCHANNELS; irq++) {
-			if (stsch(irq, &console_subchannel.schib) != 0)
+		do {
+			if (stsch(schid, &console_subchannel.schib) != 0)
 				break;
 			if (console_subchannel.schib.pmcw.dnv &&
 			    console_subchannel.schib.pmcw.dev ==
 			    console_devno) {
-				console_irq = irq;
+				console_irq = schid.sch_no;
 				break;
 			}
-		}
+		} while (schid.sch_no++ < __MAX_SUBCHANNEL);
 		if (console_irq == -1)
 			return -1;
 	} else {
@@ -729,6 +731,7 @@ struct subchannel *
 cio_probe_console(void)
 {
 	int irq, ret;
+	struct subchannel_id schid;
 
 	if (xchg(&console_subchannel_in_use, 1) != 0)
 		return ERR_PTR(-EBUSY);
@@ -738,7 +741,9 @@ cio_probe_console(void)
 		return ERR_PTR(-ENODEV);
 	}
 	memset(&console_subchannel, 0, sizeof(struct subchannel));
-	ret = cio_validate_subchannel(&console_subchannel, irq);
+	init_subchannel_id(&schid);
+	schid.sch_no = irq;
+	ret = cio_validate_subchannel(&console_subchannel, schid);
 	if (ret) {
 		console_subchannel_in_use = 0;
 		return ERR_PTR(-ENODEV);
@@ -770,11 +775,11 @@ cio_release_console(void)
 
 /* Bah... hack to catch console special sausages. */
 int
-cio_is_console(int irq)
+cio_is_console(struct subchannel_id schid)
 {
 	if (!console_subchannel_in_use)
 		return 0;
-	return (irq == console_subchannel.irq);
+	return schid_equal(&schid, &console_subchannel.schid);
 }
 
 struct subchannel *
@@ -787,7 +792,7 @@ cio_get_console_subchannel(void)
 
 #endif
 static inline int
-__disable_subchannel_easy(unsigned int schid, struct schib *schib)
+__disable_subchannel_easy(struct subchannel_id schid, struct schib *schib)
 {
 	int retry, cc;
 
@@ -805,7 +810,7 @@ __disable_subchannel_easy(unsigned int schid, struct schib *schib)
 }
 
 static inline int
-__clear_subchannel_easy(unsigned int schid)
+__clear_subchannel_easy(struct subchannel_id schid)
 {
 	int retry;
 
@@ -815,8 +820,8 @@ __clear_subchannel_easy(unsigned int schid)
 		struct tpi_info ti;
 
 		if (tpi(&ti)) {
-			tsch(ti.irq, (struct irb *)__LC_IRB);
-			if (ti.irq == schid)
+			tsch(ti.schid, (struct irb *)__LC_IRB);
+			if (schid_equal(&ti.schid, &schid))
 				return 0;
 		}
 		udelay(100);
@@ -830,10 +835,11 @@ extern void do_reipl(unsigned long devno);
 void
 clear_all_subchannels(void)
 {
-	unsigned int schid;
+	struct subchannel_id schid;
 
 	local_irq_disable();
-	for (schid=0;schid<=highest_subchannel;schid++) {
+	init_subchannel_id(&schid);
+	do {
 		struct schib schib;
 		if (stsch(schid, &schib))
 			break; /* break out of the loop */
@@ -849,7 +855,7 @@ clear_all_subchannels(void)
 			stsch(schid, &schib);
 			__disable_subchannel_easy(schid, &schib);
 		}
-	}
+	} while (schid.sch_no++ < __MAX_SUBCHANNEL);
 }
 
 /* Make sure all subchannels are quiet before we re-ipl an lpar. */
diff --git a/drivers/s390/cio/cio.h b/drivers/s390/cio/cio.h
index c50a9da420a9..0ca987344e07 100644
--- a/drivers/s390/cio/cio.h
+++ b/drivers/s390/cio/cio.h
@@ -1,6 +1,8 @@
 #ifndef S390_CIO_H
 #define S390_CIO_H
 
+#include "schid.h"
+
 /*
  * where we put the ssd info
  */
@@ -83,7 +85,7 @@ struct orb {
 
 /* subchannel data structure used by I/O subroutines */
 struct subchannel {
-	unsigned int irq;	/* aka. subchannel number */
+	struct subchannel_id schid;
 	spinlock_t lock;	/* subchannel lock */
 
 	enum {
@@ -114,7 +116,7 @@ struct subchannel {
 
 #define to_subchannel(n) container_of(n, struct subchannel, dev)
 
-extern int cio_validate_subchannel (struct subchannel *, unsigned int);
+extern int cio_validate_subchannel (struct subchannel *, struct subchannel_id);
 extern int cio_enable_subchannel (struct subchannel *, unsigned int);
 extern int cio_disable_subchannel (struct subchannel *);
 extern int cio_cancel (struct subchannel *);
@@ -127,14 +129,15 @@ extern int cio_cancel (struct subchannel *);
 extern int cio_set_options (struct subchannel *, int);
 extern int cio_get_options (struct subchannel *);
 extern int cio_modify (struct subchannel *);
+
 /* Use with care. */
 #ifdef CONFIG_CCW_CONSOLE
 extern struct subchannel *cio_probe_console(void);
 extern void cio_release_console(void);
-extern int cio_is_console(int irq);
+extern int cio_is_console(struct subchannel_id);
 extern struct subchannel *cio_get_console_subchannel(void);
 #else
-#define cio_is_console(irq) 0
+#define cio_is_console(schid) 0
 #define cio_get_console_subchannel() NULL
 #endif
 
diff --git a/drivers/s390/cio/cmf.c b/drivers/s390/cio/cmf.c
index b978f7fe8327..0b03714e696a 100644
--- a/drivers/s390/cio/cmf.c
+++ b/drivers/s390/cio/cmf.c
@@ -1,5 +1,5 @@
 /*
- * linux/drivers/s390/cio/cmf.c ($Revision: 1.16 $)
+ * linux/drivers/s390/cio/cmf.c ($Revision: 1.19 $)
  *
  * Linux on zSeries Channel Measurement Facility support
  *
@@ -178,7 +178,7 @@ set_schib(struct ccw_device *cdev, u32 mme, int mbfc, unsigned long address)
 	/* msch can silently fail, so do it again if necessary */
 	for (retry = 0; retry < 3; retry++) {
 		/* prepare schib */
-		stsch(sch->irq, schib);
+		stsch(sch->schid, schib);
 		schib->pmcw.mme  = mme;
 		schib->pmcw.mbfc = mbfc;
 		/* address can be either a block address or a block index */
@@ -188,7 +188,7 @@ set_schib(struct ccw_device *cdev, u32 mme, int mbfc, unsigned long address)
 			schib->pmcw.mbi = address;
 
 		/* try to submit it */
-		switch(ret = msch_err(sch->irq, schib)) {
+		switch(ret = msch_err(sch->schid, schib)) {
 			case 0:
 				break;
 			case 1:
@@ -202,7 +202,7 @@ set_schib(struct ccw_device *cdev, u32 mme, int mbfc, unsigned long address)
 				ret = -EINVAL;
 				break;
 		}
-		stsch(sch->irq, schib); /* restore the schib */
+		stsch(sch->schid, schib); /* restore the schib */
 
 		if (ret)
 			break;
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 7e4d57b4266f..5137dafd1e8d 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -33,7 +33,7 @@ struct device css_bus_device = {
 };
 
 static struct subchannel *
-css_alloc_subchannel(int irq)
+css_alloc_subchannel(struct subchannel_id schid)
 {
 	struct subchannel *sch;
 	int ret;
@@ -41,13 +41,11 @@ css_alloc_subchannel(int irq)
 	sch = kmalloc (sizeof (*sch), GFP_KERNEL | GFP_DMA);
 	if (sch == NULL)
 		return ERR_PTR(-ENOMEM);
-	ret = cio_validate_subchannel (sch, irq);
+	ret = cio_validate_subchannel (sch, schid);
 	if (ret < 0) {
 		kfree(sch);
 		return ERR_PTR(ret);
 	}
-	if (irq > highest_subchannel)
-		highest_subchannel = irq;
 
 	if (sch->st != SUBCHANNEL_TYPE_IO) {
 		/* For now we ignore all non-io subchannels. */
@@ -87,7 +85,7 @@ css_subchannel_release(struct device *dev)
 	struct subchannel *sch;
 
 	sch = to_subchannel(dev);
-	if (!cio_is_console(sch->irq))
+	if (!cio_is_console(sch->schid))
 		kfree(sch);
 }
 
@@ -114,12 +112,12 @@ css_register_subchannel(struct subchannel *sch)
 }
 
 int
-css_probe_device(int irq)
+css_probe_device(struct subchannel_id schid)
 {
 	int ret;
 	struct subchannel *sch;
 
-	sch = css_alloc_subchannel(irq);
+	sch = css_alloc_subchannel(schid);
 	if (IS_ERR(sch))
 		return PTR_ERR(sch);
 	ret = css_register_subchannel(sch);
@@ -132,26 +130,26 @@ static int
 check_subchannel(struct device * dev, void * data)
 {
 	struct subchannel *sch;
-	int irq = (unsigned long)data;
+	struct subchannel_id *schid = data;
 
 	sch = to_subchannel(dev);
-	return (sch->irq == irq);
+	return schid_equal(&sch->schid, schid);
 }
 
 struct subchannel *
-get_subchannel_by_schid(int irq)
+get_subchannel_by_schid(struct subchannel_id schid)
 {
 	struct device *dev;
 
 	dev = bus_find_device(&css_bus_type, NULL,
-			      (void *)(unsigned long)irq, check_subchannel);
+			      (void *)&schid, check_subchannel);
 
 	return dev ? to_subchannel(dev) : NULL;
 }
 
 
 static inline int
-css_get_subchannel_status(struct subchannel *sch, int schid)
+css_get_subchannel_status(struct subchannel *sch, struct subchannel_id schid)
 {
 	struct schib schib;
 	int cc;
@@ -170,13 +168,13 @@ css_get_subchannel_status(struct subchannel *sch, int schid)
 }
 	
 static int
-css_evaluate_subchannel(int irq, int slow)
+css_evaluate_subchannel(struct subchannel_id schid, int slow)
 {
 	int event, ret, disc;
 	struct subchannel *sch;
 	unsigned long flags;
 
-	sch = get_subchannel_by_schid(irq);
+	sch = get_subchannel_by_schid(schid);
 	disc = sch ? device_is_disconnected(sch) : 0;
 	if (disc && slow) {
 		if (sch)
@@ -194,9 +192,10 @@ css_evaluate_subchannel(int irq, int slow)
 			put_device(&sch->dev);
 		return -EAGAIN; /* Will be done on the slow path. */
 	}
-	event = css_get_subchannel_status(sch, irq);
+	event = css_get_subchannel_status(sch, schid);
 	CIO_MSG_EVENT(4, "Evaluating schid %04x, event %d, %s, %s path.\n",
-		      irq, event, sch?(disc?"disconnected":"normal"):"unknown",
+		      schid.sch_no, event,
+		      sch?(disc?"disconnected":"normal"):"unknown",
 		      slow?"slow":"fast");
 	switch (event) {
 	case CIO_NO_PATH:
@@ -253,7 +252,7 @@ css_evaluate_subchannel(int irq, int slow)
 			sch->schib.pmcw.intparm = 0;
 			cio_modify(sch);
 			put_device(&sch->dev);
-			ret = css_probe_device(irq);
+			ret = css_probe_device(schid);
 		} else {
 			/*
 			 * We can't immediately deregister the disconnected
@@ -272,7 +271,7 @@ css_evaluate_subchannel(int irq, int slow)
 			device_trigger_reprobe(sch);
 			spin_unlock_irqrestore(&sch->lock, flags);
 		}
-		ret = sch ? 0 : css_probe_device(irq);
+		ret = sch ? 0 : css_probe_device(schid);
 		break;
 	default:
 		BUG();
@@ -284,10 +283,12 @@ css_evaluate_subchannel(int irq, int slow)
 static void
 css_rescan_devices(void)
 {
-	int irq, ret;
+	int ret;
+	struct subchannel_id schid;
 
-	for (irq = 0; irq < __MAX_SUBCHANNELS; irq++) {
-		ret = css_evaluate_subchannel(irq, 1);
+	init_subchannel_id(&schid);
+	do {
+		ret = css_evaluate_subchannel(schid, 1);
 		/* No more memory. It doesn't make sense to continue. No
 		 * panic because this can happen in midflight and just
 		 * because we can't use a new device is no reason to crash
@@ -297,12 +298,12 @@ css_rescan_devices(void)
 		/* -ENXIO indicates that there are no more subchannels. */
 		if (ret == -ENXIO)
 			break;
-	}
+	} while (schid.sch_no++ < __MAX_SUBCHANNEL);
 }
 
 struct slow_subchannel {
 	struct list_head slow_list;
-	unsigned long schid;
+	struct subchannel_id schid;
 };
 
 static LIST_HEAD(slow_subchannels_head);
@@ -357,20 +358,24 @@ int
 css_process_crw(int irq)
 {
 	int ret;
+	struct subchannel_id mchk_schid;
 
 	CIO_CRW_EVENT(2, "source is subchannel %04X\n", irq);
 
 	if (need_rescan)
 		/* We need to iterate all subchannels anyway. */
 		return -EAGAIN;
+
+	init_subchannel_id(&mchk_schid);
+	mchk_schid.sch_no = irq;
 	/* 
 	 * Since we are always presented with IPI in the CRW, we have to
 	 * use stsch() to find out if the subchannel in question has come
 	 * or gone.
 	 */
-	ret = css_evaluate_subchannel(irq, 0);
+	ret = css_evaluate_subchannel(mchk_schid, 0);
 	if (ret == -EAGAIN) {
-		if (css_enqueue_subchannel_slow(irq)) {
+		if (css_enqueue_subchannel_slow(mchk_schid)) {
 			css_clear_subchannel_slow_list();
 			need_rescan = 1;
 		}
@@ -404,7 +409,8 @@ css_generate_pgid(void)
 static int __init
 init_channel_subsystem (void)
 {
-	int ret, irq;
+	int ret;
+	struct subchannel_id schid;
 
 	if (chsc_determine_css_characteristics() == 0)
 		css_characteristics_avail = 1;
@@ -420,13 +426,14 @@ init_channel_subsystem (void)
 
 	ctl_set_bit(6, 28);
 
-	for (irq = 0; irq < __MAX_SUBCHANNELS; irq++) {
+	init_subchannel_id(&schid);
+	do {
 		struct subchannel *sch;
 
-		if (cio_is_console(irq))
+		if (cio_is_console(schid))
 			sch = cio_get_console_subchannel();
 		else {
-			sch = css_alloc_subchannel(irq);
+			sch = css_alloc_subchannel(schid);
 			if (IS_ERR(sch))
 				ret = PTR_ERR(sch);
 			else
@@ -448,7 +455,7 @@ init_channel_subsystem (void)
 		 * console subchannel.
 		 */
 		css_register_subchannel(sch);
-	}
+	} while (schid.sch_no++ < __MAX_SUBCHANNEL);
 	return 0;
 
 out_bus:
@@ -482,7 +489,7 @@ struct bus_type css_bus_type = {
 subsys_initcall(init_channel_subsystem);
 
 int
-css_enqueue_subchannel_slow(unsigned long schid)
+css_enqueue_subchannel_slow(struct subchannel_id schid)
 {
 	struct slow_subchannel *new_slow_sch;
 	unsigned long flags;
diff --git a/drivers/s390/cio/css.h b/drivers/s390/cio/css.h
index 2004a6c49388..f26e16daecb5 100644
--- a/drivers/s390/cio/css.h
+++ b/drivers/s390/cio/css.h
@@ -6,6 +6,8 @@
 
 #include <asm/cio.h>
 
+#include "schid.h"
+
 /*
  * path grouping stuff
  */
@@ -68,7 +70,7 @@ struct ccw_device_private {
 	atomic_t onoff;
 	unsigned long registered;
 	__u16 devno;		/* device number */
-	__u16 irq;		/* subchannel number */
+	__u16 sch_no;		/* subchannel number */
 	__u8 imask;		/* lpm mask for SNID/SID/SPGID */
 	int iretry;		/* retry counter SNID/SID/SPGID */
 	struct {
@@ -121,12 +123,11 @@ struct css_driver {
 extern struct bus_type css_bus_type;
 extern struct css_driver io_subchannel_driver;
 
-int css_probe_device(int irq);
-extern struct subchannel * get_subchannel_by_schid(int irq);
-extern unsigned int highest_subchannel;
+extern int css_probe_device(struct subchannel_id);
+extern struct subchannel * get_subchannel_by_schid(struct subchannel_id);
 extern int css_init_done;
 
-#define __MAX_SUBCHANNELS 65536
+#define __MAX_SUBCHANNEL 65535
 
 extern struct bus_type css_bus_type;
 extern struct device css_bus_device;
@@ -144,7 +145,7 @@ void device_set_waiting(struct subchannel *);
 void device_kill_pending_timer(struct subchannel *);
 
 /* Helper functions to build lists for the slow path. */
-int css_enqueue_subchannel_slow(unsigned long schid);
+extern int css_enqueue_subchannel_slow(struct subchannel_id schid);
 void css_walk_subchannel_slow_list(void (*fn)(unsigned long));
 void css_clear_subchannel_slow_list(void);
 int css_slow_subchannels_exist(void);
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 0590cffe62aa..9ac07aeffbe6 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -622,7 +622,7 @@ ccw_device_do_unreg_rereg(void *data)
 
 			other_sch = to_subchannel(other_cdev->dev.parent);
 			if (get_device(&other_sch->dev)) {
-				stsch(other_sch->irq, &other_sch->schib);
+				stsch(other_sch->schid, &other_sch->schib);
 				if (other_sch->schib.pmcw.dnv) {
 					other_sch->schib.pmcw.intparm = 0;
 					cio_modify(other_sch);
@@ -772,7 +772,7 @@ io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
 	/* Init private data. */
 	priv = cdev->private;
 	priv->devno = sch->schib.pmcw.dev;
-	priv->irq = sch->irq;
+	priv->sch_no = sch->schid.sch_no;
 	priv->state = DEV_STATE_NOT_OPER;
 	INIT_LIST_HEAD(&priv->cmb_list);
 	init_waitqueue_head(&priv->wait_q);
@@ -951,7 +951,7 @@ io_subchannel_shutdown(struct device *dev)
 	sch = to_subchannel(dev);
 	cdev = dev->driver_data;
 
-	if (cio_is_console(sch->irq))
+	if (cio_is_console(sch->schid))
 		return;
 	if (!sch->schib.pmcw.ena)
 		/* Nothing to do. */
@@ -1146,6 +1146,16 @@ ccw_driver_unregister (struct ccw_driver *cdriver)
 	driver_unregister(&cdriver->driver);
 }
 
+/* Helper func for qdio. */
+struct subchannel_id
+ccw_device_get_subchannel_id(struct ccw_device *cdev)
+{
+	struct subchannel *sch;
+
+	sch = to_subchannel(cdev->dev.parent);
+	return sch->schid;
+}
+
 MODULE_LICENSE("GPL");
 EXPORT_SYMBOL(ccw_device_set_online);
 EXPORT_SYMBOL(ccw_device_set_offline);
@@ -1155,3 +1165,4 @@ EXPORT_SYMBOL(get_ccwdev_by_busid);
 EXPORT_SYMBOL(ccw_bus_type);
 EXPORT_SYMBOL(ccw_device_work);
 EXPORT_SYMBOL(ccw_device_notify_work);
+EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id);
diff --git a/drivers/s390/cio/device.h b/drivers/s390/cio/device.h
index a3aa056d7245..11587ebb7289 100644
--- a/drivers/s390/cio/device.h
+++ b/drivers/s390/cio/device.h
@@ -110,6 +110,7 @@ int ccw_device_stlck(struct ccw_device *);
 
 /* qdio needs this. */
 void ccw_device_set_timeout(struct ccw_device *, int);
+extern struct subchannel_id ccw_device_get_subchannel_id(struct ccw_device *);
 
 void retry_set_schib(struct ccw_device *cdev);
 #endif
diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
index c1c89f4fd4e3..9efeae75ad28 100644
--- a/drivers/s390/cio/device_fsm.c
+++ b/drivers/s390/cio/device_fsm.c
@@ -133,7 +133,7 @@ ccw_device_cancel_halt_clear(struct ccw_device *cdev)
 	int ret;
 
 	sch = to_subchannel(cdev->dev.parent);
-	ret = stsch(sch->irq, &sch->schib);
+	ret = stsch(sch->schid, &sch->schib);
 	if (ret || !sch->schib.pmcw.dnv)
 		return -ENODEV; 
 	if (!sch->schib.pmcw.ena || sch->schib.scsw.actl == 0)
@@ -231,7 +231,7 @@ ccw_device_recog_done(struct ccw_device *cdev, int state)
 	 * through ssch() and the path information is up to date.
 	 */
 	old_lpm = sch->lpm;
-	stsch(sch->irq, &sch->schib);
+	stsch(sch->schid, &sch->schib);
 	sch->lpm = sch->schib.pmcw.pim &
 		sch->schib.pmcw.pam &
 		sch->schib.pmcw.pom &
@@ -258,7 +258,7 @@ ccw_device_recog_done(struct ccw_device *cdev, int state)
 	case DEV_STATE_NOT_OPER:
 		CIO_DEBUG(KERN_WARNING, 2,
 			  "SenseID : unknown device %04x on subchannel %04x\n",
-			  cdev->private->devno, sch->irq);
+			  cdev->private->devno, sch->schid.sch_no);
 		break;
 	case DEV_STATE_OFFLINE:
 		if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
@@ -291,7 +291,7 @@ ccw_device_recog_done(struct ccw_device *cdev, int state)
 	case DEV_STATE_BOXED:
 		CIO_DEBUG(KERN_WARNING, 2,
 			  "SenseID : boxed device %04x on subchannel %04x\n",
-			  cdev->private->devno, sch->irq);
+			  cdev->private->devno, sch->schid.sch_no);
 		break;
 	}
 	cdev->private->state = state;
@@ -359,7 +359,7 @@ ccw_device_done(struct ccw_device *cdev, int state)
 	if (state == DEV_STATE_BOXED)
 		CIO_DEBUG(KERN_WARNING, 2,
 			  "Boxed device %04x on subchannel %04x\n",
-			  cdev->private->devno, sch->irq);
+			  cdev->private->devno, sch->schid.sch_no);
 
 	if (cdev->private->flags.donotify) {
 		cdev->private->flags.donotify = 0;
@@ -592,7 +592,7 @@ ccw_device_offline(struct ccw_device *cdev)
 	struct subchannel *sch;
 
 	sch = to_subchannel(cdev->dev.parent);
-	if (stsch(sch->irq, &sch->schib) || !sch->schib.pmcw.dnv)
+	if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 		return -ENODEV;
 	if (cdev->private->state != DEV_STATE_ONLINE) {
 		if (sch->schib.scsw.actl != 0)
@@ -711,7 +711,7 @@ ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 	 * Since we might not just be coming from an interrupt from the
 	 * subchannel we have to update the schib.
 	 */
-	stsch(sch->irq, &sch->schib);
+	stsch(sch->schid, &sch->schib);
 
 	if (sch->schib.scsw.actl != 0 ||
 	    (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
@@ -923,7 +923,7 @@ ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event)
 
 	/* Iff device is idle, reset timeout. */
 	sch = to_subchannel(cdev->dev.parent);
-	if (!stsch(sch->irq, &sch->schib))
+	if (!stsch(sch->schid, &sch->schib))
 		if (sch->schib.scsw.actl == 0)
 			ccw_device_set_timeout(cdev, 0);
 	/* Call the handler. */
@@ -1035,7 +1035,7 @@ device_trigger_reprobe(struct subchannel *sch)
 		return;
 
 	/* Update some values. */
-	if (stsch(sch->irq, &sch->schib))
+	if (stsch(sch->schid, &sch->schib))
 		return;
 
 	/*
diff --git a/drivers/s390/cio/device_id.c b/drivers/s390/cio/device_id.c
index 0e68fb511dc9..207881ec7aaf 100644
--- a/drivers/s390/cio/device_id.c
+++ b/drivers/s390/cio/device_id.c
@@ -258,7 +258,7 @@ ccw_device_check_sense_id(struct ccw_device *cdev)
 		 */
 		CIO_MSG_EVENT(2, "SenseID : device %04x on Subchannel %04x "
 			      "reports cmd reject\n",
-			      cdev->private->devno, sch->irq);
+			      cdev->private->devno, sch->schid.sch_no);
 		return -EOPNOTSUPP;
 	}
 	if (irb->esw.esw0.erw.cons) {
@@ -280,13 +280,13 @@ ccw_device_check_sense_id(struct ccw_device *cdev)
 			CIO_MSG_EVENT(2, "SenseID : path %02X for device %04x on"
 				      " subchannel %04x is 'not operational'\n",
 				      sch->orb.lpm, cdev->private->devno,
-				      sch->irq);
+				      sch->schid.sch_no);
 		return -EACCES;
 	}
 	/* Hmm, whatever happened, try again. */
 	CIO_MSG_EVENT(2, "SenseID : start_IO() for device %04x on "
 		      "subchannel %04x returns status %02X%02X\n",
-		      cdev->private->devno, sch->irq,
+		      cdev->private->devno, sch->schid.sch_no,
 		      irb->scsw.dstat, irb->scsw.cstat);
 	return -EAGAIN;
 }
diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c
index 85a3026e6900..143b6c25a4e6 100644
--- a/drivers/s390/cio/device_ops.c
+++ b/drivers/s390/cio/device_ops.c
@@ -1,7 +1,7 @@
 /*
  *  drivers/s390/cio/device_ops.c
  *
- *   $Revision: 1.57 $
+ *   $Revision: 1.58 $
  *
  *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
  *			 IBM Corporation
@@ -570,7 +570,7 @@ ccw_device_get_chp_desc(struct ccw_device *cdev, int chp_no)
 int
 _ccw_device_get_subchannel_number(struct ccw_device *cdev)
 {
-	return cdev->private->irq;
+	return cdev->private->sch_no;
 }
 
 int
diff --git a/drivers/s390/cio/device_pgid.c b/drivers/s390/cio/device_pgid.c
index 757b2706d5a9..f08e84cc3563 100644
--- a/drivers/s390/cio/device_pgid.c
+++ b/drivers/s390/cio/device_pgid.c
@@ -59,7 +59,7 @@ __ccw_device_sense_pgid_start(struct ccw_device *cdev)
 			CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel "
 				      "%04x, lpm %02X, became 'not "
 				      "operational'\n",
-				      cdev->private->devno, sch->irq,
+				      cdev->private->devno, sch->schid.sch_no,
 				      cdev->private->imask);
 
 		}
@@ -121,13 +121,14 @@ __ccw_device_check_sense_pgid(struct ccw_device *cdev)
 	if (irb->scsw.cc == 3) {
 		CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel "
 			      "%04x, lpm %02X, became 'not operational'\n",
-			      cdev->private->devno, sch->irq, sch->orb.lpm);
+			      cdev->private->devno, sch->schid.sch_no,
+			      sch->orb.lpm);
 		return -EACCES;
 	}
 	if (cdev->private->pgid.inf.ps.state2 == SNID_STATE2_RESVD_ELSE) {
 		CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel %04x "
 			      "is reserved by someone else\n",
-			      cdev->private->devno, sch->irq);
+			      cdev->private->devno, sch->schid.sch_no);
 		return -EUSERS;
 	}
 	return 0;
@@ -237,7 +238,7 @@ __ccw_device_do_pgid(struct ccw_device *cdev, __u8 func)
 	sch->vpm &= ~cdev->private->imask;
 	CIO_MSG_EVENT(2, "SPID - Device %04x on Subchannel "
 		      "%04x, lpm %02X, became 'not operational'\n",
-		      cdev->private->devno, sch->irq, cdev->private->imask);
+		      cdev->private->devno, sch->schid.sch_no, cdev->private->imask);
 	return ret;
 }
 
@@ -271,7 +272,7 @@ __ccw_device_check_pgid(struct ccw_device *cdev)
 	if (irb->scsw.cc == 3) {
 		CIO_MSG_EVENT(2, "SPID - Device %04x on Subchannel "
 			      "%04x, lpm %02X, became 'not operational'\n",
-			      cdev->private->devno, sch->irq,
+			      cdev->private->devno, sch->schid.sch_no,
 			      cdev->private->imask);
 		return -EACCES;
 	}
@@ -373,7 +374,7 @@ ccw_device_verify_start(struct ccw_device *cdev)
 	 * Update sch->lpm with current values to catch paths becoming
 	 * available again.
 	 */
-	if (stsch(sch->irq, &sch->schib)) {
+	if (stsch(sch->schid, &sch->schib)) {
 		ccw_device_verify_done(cdev, -ENODEV);
 		return;
 	}
diff --git a/drivers/s390/cio/device_status.c b/drivers/s390/cio/device_status.c
index 12a24d4331a2..929f8fb505f2 100644
--- a/drivers/s390/cio/device_status.c
+++ b/drivers/s390/cio/device_status.c
@@ -38,13 +38,13 @@ ccw_device_msg_control_check(struct ccw_device *cdev, struct irb *irb)
 		      "received"
 		      " ... device %04X on subchannel %04X, dev_stat "
 		      ": %02X sch_stat : %02X\n",
-		      cdev->private->devno, cdev->private->irq,
+		      cdev->private->devno, cdev->private->sch_no,
 		      irb->scsw.dstat, irb->scsw.cstat);
 
 	if (irb->scsw.cc != 3) {
 		char dbf_text[15];
 
-		sprintf(dbf_text, "chk%x", cdev->private->irq);
+		sprintf(dbf_text, "chk%x", cdev->private->sch_no);
 		CIO_TRACE_EVENT(0, dbf_text);
 		CIO_HEX_EVENT(0, irb, sizeof (struct irb));
 	}
@@ -59,10 +59,10 @@ ccw_device_path_notoper(struct ccw_device *cdev)
 	struct subchannel *sch;
 
 	sch = to_subchannel(cdev->dev.parent);
-	stsch (sch->irq, &sch->schib);
+	stsch (sch->schid, &sch->schib);
 
 	CIO_MSG_EVENT(0, "%s(%04x) - path(s) %02x are "
-		      "not operational \n", __FUNCTION__, sch->irq,
+		      "not operational \n", __FUNCTION__, sch->schid.sch_no,
 		      sch->schib.pmcw.pnom);
 
 	sch->lpm &= ~sch->schib.pmcw.pnom;
diff --git a/drivers/s390/cio/ioasm.h b/drivers/s390/cio/ioasm.h
index 45480a2bc4c0..66c882e52f32 100644
--- a/drivers/s390/cio/ioasm.h
+++ b/drivers/s390/cio/ioasm.h
@@ -1,12 +1,13 @@
 #ifndef S390_CIO_IOASM_H
 #define S390_CIO_IOASM_H
 
+#include "schid.h"
+
 /*
  * TPI info structure
  */
 struct tpi_info {
-	__u32 reserved1	 : 16;	 /* reserved 0x00000001 */
-	__u32 irq	 : 16;	 /* aka. subchannel number */
+	struct subchannel_id schid;
 	__u32 intparm;		 /* interruption parameter */
 	__u32 adapter_IO : 1;
 	__u32 reserved2	 : 1;
@@ -21,7 +22,8 @@ struct tpi_info {
  * Some S390 specific IO instructions as inline
  */
 
-static inline int stsch(int irq, volatile struct schib *addr)
+static inline int stsch(struct subchannel_id schid,
+			    volatile struct schib *addr)
 {
 	int ccode;
 
@@ -31,12 +33,13 @@ static inline int stsch(int irq, volatile struct schib *addr)
 		"   ipm	  %0\n"
 		"   srl	  %0,28"
 		: "=d" (ccode)
-		: "d" (irq | 0x10000), "a" (addr)
+		: "d" (schid), "a" (addr), "m" (*addr)
 		: "cc", "1" );
 	return ccode;
 }
 
-static inline int msch(int irq, volatile struct schib *addr)
+static inline int msch(struct subchannel_id schid,
+			   volatile struct schib *addr)
 {
 	int ccode;
 
@@ -46,12 +49,13 @@ static inline int msch(int irq, volatile struct schib *addr)
 		"   ipm	  %0\n"
 		"   srl	  %0,28"
 		: "=d" (ccode)
-		: "d" (irq | 0x10000L), "a" (addr)
+		: "d" (schid), "a" (addr), "m" (*addr)
 		: "cc", "1" );
 	return ccode;
 }
 
-static inline int msch_err(int irq, volatile struct schib *addr)
+static inline int msch_err(struct subchannel_id schid,
+			       volatile struct schib *addr)
 {
 	int ccode;
 
@@ -74,12 +78,13 @@ static inline int msch_err(int irq, volatile struct schib *addr)
 		".previous"
 #endif
 		: "=&d" (ccode)
-		: "d" (irq | 0x10000L), "a" (addr), "K" (-EIO)
+		: "d" (schid), "a" (addr), "K" (-EIO), "m" (*addr)
 		: "cc", "1" );
 	return ccode;
 }
 
-static inline int tsch(int irq, volatile struct irb *addr)
+static inline int tsch(struct subchannel_id schid,
+			   volatile struct irb *addr)
 {
 	int ccode;
 
@@ -89,7 +94,7 @@ static inline int tsch(int irq, volatile struct irb *addr)
 		"   ipm	  %0\n"
 		"   srl	  %0,28"
 		: "=d" (ccode)
-		: "d" (irq | 0x10000L), "a" (addr)
+		: "d" (schid), "a" (addr), "m" (*addr)
 		: "cc", "1" );
 	return ccode;
 }
@@ -103,12 +108,13 @@ static inline int tpi( volatile struct tpi_info *addr)
 		"   ipm	  %0\n"
 		"   srl	  %0,28"
 		: "=d" (ccode)
-		: "a" (addr)
+		: "a" (addr), "m" (*addr)
 		: "cc", "1" );
 	return ccode;
 }
 
-static inline int ssch(int irq, volatile struct orb *addr)
+static inline int ssch(struct subchannel_id schid,
+			   volatile struct orb *addr)
 {
 	int ccode;
 
@@ -118,12 +124,12 @@ static inline int ssch(int irq, volatile struct orb *addr)
 		"   ipm	  %0\n"
 		"   srl	  %0,28"
 		: "=d" (ccode)
-		: "d" (irq | 0x10000L), "a" (addr)
+		: "d" (schid), "a" (addr), "m" (*addr)
 		: "cc", "1" );
 	return ccode;
 }
 
-static inline int rsch(int irq)
+static inline int rsch(struct subchannel_id schid)
 {
 	int ccode;
 
@@ -133,12 +139,12 @@ static inline int rsch(int irq)
 		"   ipm	  %0\n"
 		"   srl	  %0,28"
 		: "=d" (ccode)
-		: "d" (irq | 0x10000L)
+		: "d" (schid)
 		: "cc", "1" );
 	return ccode;
 }
 
-static inline int csch(int irq)
+static inline int csch(struct subchannel_id schid)
 {
 	int ccode;
 
@@ -148,12 +154,12 @@ static inline int csch(int irq)
 		"   ipm	  %0\n"
 		"   srl	  %0,28"
 		: "=d" (ccode)
-		: "d" (irq | 0x10000L)
+		: "d" (schid)
 		: "cc", "1" );
 	return ccode;
 }
 
-static inline int hsch(int irq)
+static inline int hsch(struct subchannel_id schid)
 {
 	int ccode;
 
@@ -163,12 +169,12 @@ static inline int hsch(int irq)
 		"   ipm	  %0\n"
 		"   srl	  %0,28"
 		: "=d" (ccode)
-		: "d" (irq | 0x10000L)
+		: "d" (schid)
 		: "cc", "1" );
 	return ccode;
 }
 
-static inline int xsch(int irq)
+static inline int xsch(struct subchannel_id schid)
 {
 	int ccode;
 
@@ -178,21 +184,22 @@ static inline int xsch(int irq)
 		"   ipm	  %0\n"
 		"   srl	  %0,28"
 		: "=d" (ccode)
-		: "d" (irq | 0x10000L)
+		: "d" (schid)
 		: "cc", "1" );
 	return ccode;
 }
 
 static inline int chsc(void *chsc_area)
 {
+	typedef struct { char _[4096]; } addr_type;
 	int cc;
 
 	__asm__ __volatile__ (
-		".insn	rre,0xb25f0000,%1,0	\n\t"
+		".insn	rre,0xb25f0000,%2,0	\n\t"
 		"ipm	%0	\n\t"
 		"srl	%0,28	\n\t"
-		: "=d" (cc)
-		: "d" (chsc_area)
+		: "=d" (cc), "=m" (*(addr_type *) chsc_area)
+		: "d" (chsc_area), "m" (*(addr_type *) chsc_area)
 		: "cc" );
 
 	return cc;
diff --git a/drivers/s390/cio/qdio.c b/drivers/s390/cio/qdio.c
index e8bdfcd1d02a..5c7001b5c7a1 100644
--- a/drivers/s390/cio/qdio.c
+++ b/drivers/s390/cio/qdio.c
@@ -270,7 +270,7 @@ qdio_siga_sync(struct qdio_q *q, unsigned int gpr2,
 	perf_stats.siga_syncs++;
 #endif /* QDIO_PERFORMANCE_STATS */
 
-	cc = do_siga_sync(0x10000|q->irq, gpr2, gpr3);
+	cc = do_siga_sync(q->schid, gpr2, gpr3);
 	if (cc)
 		QDIO_DBF_HEX3(0,trace,&cc,sizeof(int*));
 
@@ -290,12 +290,16 @@ __do_siga_output(struct qdio_q *q, unsigned int *busy_bit)
 {
        struct qdio_irq *irq;
        unsigned int fc = 0;
+       unsigned long schid;
 
        irq = (struct qdio_irq *) q->irq_ptr;
        if (!irq->is_qebsm)
-               return do_siga_output(0x10000|q->irq, q->mask, busy_bit, fc);
-       fc |= 0x80;
-       return do_siga_output(irq->sch_token, q->mask, busy_bit, fc);
+	       schid = *((u32 *)&q->schid);
+       else {
+	       schid = irq->sch_token;
+	       fc |= 0x80;
+       }
+       return do_siga_output(schid, q->mask, busy_bit, fc);
 }
 
 /* 
@@ -349,7 +353,7 @@ qdio_siga_input(struct qdio_q *q)
 	perf_stats.siga_ins++;
 #endif /* QDIO_PERFORMANCE_STATS */
 
-	cc = do_siga_input(0x10000|q->irq, q->mask);
+	cc = do_siga_input(q->schid, q->mask);
 	
 	if (cc)
 		QDIO_DBF_HEX3(0,trace,&cc,sizeof(int*));
@@ -855,7 +859,7 @@ qdio_kick_outbound_q(struct qdio_q *q)
 		/* went smooth this time, reset timestamp */
 #ifdef CONFIG_QDIO_DEBUG
 		QDIO_DBF_TEXT3(0,trace,"cc2reslv");
-		sprintf(dbf_text,"%4x%2x%2x",q->irq,q->q_no,
+		sprintf(dbf_text,"%4x%2x%2x",q->schid.sch_no,q->q_no,
 			atomic_read(&q->busy_siga_counter));
 		QDIO_DBF_TEXT3(0,trace,dbf_text);
 #endif /* CONFIG_QDIO_DEBUG */
@@ -878,7 +882,7 @@ qdio_kick_outbound_q(struct qdio_q *q)
 		}
 		QDIO_DBF_TEXT2(0,trace,"cc2REPRT");
 #ifdef CONFIG_QDIO_DEBUG
-		sprintf(dbf_text,"%4x%2x%2x",q->irq,q->q_no,
+		sprintf(dbf_text,"%4x%2x%2x",q->schid.sch_no,q->q_no,
 			atomic_read(&q->busy_siga_counter));
 		QDIO_DBF_TEXT3(0,trace,dbf_text);
 #endif /* CONFIG_QDIO_DEBUG */
@@ -1733,7 +1737,7 @@ qdio_fill_qs(struct qdio_irq *irq_ptr, struct ccw_device *cdev,
 	void *ptr;
 	int available;
 
-	sprintf(dbf_text,"qfqs%4x",cdev->private->irq);
+	sprintf(dbf_text,"qfqs%4x",cdev->private->sch_no);
 	QDIO_DBF_TEXT0(0,setup,dbf_text);
 	for (i=0;i<no_input_qs;i++) {
 		q=irq_ptr->input_qs[i];
@@ -1753,7 +1757,7 @@ qdio_fill_qs(struct qdio_irq *irq_ptr, struct ccw_device *cdev,
 
                 q->queue_type=q_format;
 		q->int_parm=int_parm;
-		q->irq=irq_ptr->irq;
+		q->schid = irq_ptr->schid;
 		q->irq_ptr = irq_ptr;
 		q->cdev = cdev;
 		q->mask=1<<(31-i);
@@ -1826,7 +1830,7 @@ qdio_fill_qs(struct qdio_irq *irq_ptr, struct ccw_device *cdev,
                 q->queue_type=q_format;
 		q->int_parm=int_parm;
 		q->is_input_q=0;
-		q->irq=irq_ptr->irq;
+		q->schid = irq_ptr->schid;
 		q->cdev = cdev;
 		q->irq_ptr = irq_ptr;
 		q->mask=1<<(31-i);
@@ -1933,7 +1937,7 @@ qdio_set_state(struct qdio_irq *irq_ptr, enum qdio_irq_states state)
 	char dbf_text[15];
 
 	QDIO_DBF_TEXT5(0,trace,"newstate");
-	sprintf(dbf_text,"%4x%4x",irq_ptr->irq,state);
+	sprintf(dbf_text,"%4x%4x",irq_ptr->schid.sch_no,state);
 	QDIO_DBF_TEXT5(0,trace,dbf_text);
 #endif /* CONFIG_QDIO_DEBUG */
 
@@ -1946,12 +1950,12 @@ qdio_set_state(struct qdio_irq *irq_ptr, enum qdio_irq_states state)
 }
 
 static inline void
-qdio_irq_check_sense(int irq, struct irb *irb)
+qdio_irq_check_sense(struct subchannel_id schid, struct irb *irb)
 {
 	char dbf_text[15];
 
 	if (irb->esw.esw0.erw.cons) {
-		sprintf(dbf_text,"sens%4x",irq);
+		sprintf(dbf_text,"sens%4x",schid.sch_no);
 		QDIO_DBF_TEXT2(1,trace,dbf_text);
 		QDIO_DBF_HEX0(0,sense,irb,QDIO_DBF_SENSE_LEN);
 
@@ -2063,20 +2067,20 @@ qdio_timeout_handler(struct ccw_device *cdev)
 	switch (irq_ptr->state) {
 	case QDIO_IRQ_STATE_INACTIVE:
 		QDIO_PRINT_ERR("establish queues on irq %04x: timed out\n",
-			       irq_ptr->irq);
+			       irq_ptr->schid.sch_no);
 		QDIO_DBF_TEXT2(1,setup,"eq:timeo");
 		qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 		break;
 	case QDIO_IRQ_STATE_CLEANUP:
 		QDIO_PRINT_INFO("Did not get interrupt on cleanup, irq=0x%x.\n",
-				irq_ptr->irq);
+				irq_ptr->schid.sch_no);
 		qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 		break;
 	case QDIO_IRQ_STATE_ESTABLISHED:
 	case QDIO_IRQ_STATE_ACTIVE:
 		/* I/O has been terminated by common I/O layer. */
 		QDIO_PRINT_INFO("Queues on irq %04x killed by cio.\n",
-				irq_ptr->irq);
+				irq_ptr->schid.sch_no);
 		QDIO_DBF_TEXT2(1, trace, "cio:term");
 		qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 		if (get_device(&cdev->dev)) {
@@ -2139,7 +2143,7 @@ qdio_handler(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
 		}
 	}
 
-	qdio_irq_check_sense(irq_ptr->irq, irb);
+	qdio_irq_check_sense(irq_ptr->schid, irb);
 
 #ifdef CONFIG_QDIO_DEBUG
 	sprintf(dbf_text, "state:%d", irq_ptr->state);
@@ -2195,7 +2199,7 @@ qdio_synchronize(struct ccw_device *cdev, unsigned int flags,
 		return -ENODEV;
 
 #ifdef CONFIG_QDIO_DEBUG
-	*((int*)(&dbf_text[4])) = irq_ptr->irq;
+	*((int*)(&dbf_text[4])) = irq_ptr->schid.sch_no;
 	QDIO_DBF_HEX4(0,trace,dbf_text,QDIO_DBF_TRACE_LEN);
 	*((int*)(&dbf_text[0]))=flags;
 	*((int*)(&dbf_text[4]))=queue_number;
@@ -2207,13 +2211,13 @@ qdio_synchronize(struct ccw_device *cdev, unsigned int flags,
 		if (!q)
 			return -EINVAL;
 		if (!(irq_ptr->is_qebsm))
-			cc = do_siga_sync(0x10000|q->irq, 0, q->mask);
+			cc = do_siga_sync(q->schid, 0, q->mask);
 	} else if (flags&QDIO_FLAG_SYNC_OUTPUT) {
 		q=irq_ptr->output_qs[queue_number];
 		if (!q)
 			return -EINVAL;
 		if (!(irq_ptr->is_qebsm))
-			cc = do_siga_sync(0x10000|q->irq, q->mask, 0);
+			cc = do_siga_sync(q->schid, q->mask, 0);
 	} else 
 		return -EINVAL;
 
@@ -2298,7 +2302,7 @@ qdio_get_ssqd_information(struct qdio_irq *irq_ptr)
 	ssqd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 	if (!ssqd_area) {
 	        QDIO_PRINT_WARN("Could not get memory for chsc. Using all " \
-				"SIGAs for sch x%x.\n", irq_ptr->irq);
+				"SIGAs for sch x%x.\n", irq_ptr->schid.sch_no);
 		irq_ptr->qdioac = CHSC_FLAG_SIGA_INPUT_NECESSARY ||
 				  CHSC_FLAG_SIGA_OUTPUT_NECESSARY ||
 				  CHSC_FLAG_SIGA_SYNC_NECESSARY; /* all flags set */
@@ -2312,14 +2316,14 @@ qdio_get_ssqd_information(struct qdio_irq *irq_ptr)
 		.length = 0x0010,
 		.code   = 0x0024,
 	};
-	ssqd_area->first_sch = irq_ptr->irq;
-	ssqd_area->last_sch = irq_ptr->irq;
+	ssqd_area->first_sch = irq_ptr->schid.sch_no;
+	ssqd_area->last_sch = irq_ptr->schid.sch_no;
 	result = chsc(ssqd_area);
 
 	if (result) {
 		QDIO_PRINT_WARN("CHSC returned cc %i. Using all " \
 				"SIGAs for sch x%x.\n",
-				result, irq_ptr->irq);
+				result, irq_ptr->schid.sch_no);
 		qdioac = CHSC_FLAG_SIGA_INPUT_NECESSARY ||
 			CHSC_FLAG_SIGA_OUTPUT_NECESSARY ||
 			CHSC_FLAG_SIGA_SYNC_NECESSARY; /* all flags set */
@@ -2330,7 +2334,7 @@ qdio_get_ssqd_information(struct qdio_irq *irq_ptr)
 	if (ssqd_area->response.code != QDIO_CHSC_RESPONSE_CODE_OK) {
 		QDIO_PRINT_WARN("response upon checking SIGA needs " \
 				"is 0x%x. Using all SIGAs for sch x%x.\n",
-				ssqd_area->response.code, irq_ptr->irq);
+				ssqd_area->response.code, irq_ptr->schid.sch_no);
 		qdioac = CHSC_FLAG_SIGA_INPUT_NECESSARY ||
 			CHSC_FLAG_SIGA_OUTPUT_NECESSARY ||
 			CHSC_FLAG_SIGA_SYNC_NECESSARY; /* all flags set */
@@ -2339,9 +2343,9 @@ qdio_get_ssqd_information(struct qdio_irq *irq_ptr)
 	}
 	if (!(ssqd_area->flags & CHSC_FLAG_QDIO_CAPABILITY) ||
 	    !(ssqd_area->flags & CHSC_FLAG_VALIDITY) ||
-	    (ssqd_area->sch != irq_ptr->irq)) {
+	    (ssqd_area->sch != irq_ptr->schid.sch_no)) {
 		QDIO_PRINT_WARN("huh? problems checking out sch x%x... " \
-				"using all SIGAs.\n",irq_ptr->irq);
+				"using all SIGAs.\n",irq_ptr->schid.sch_no);
 		qdioac = CHSC_FLAG_SIGA_INPUT_NECESSARY |
 			CHSC_FLAG_SIGA_OUTPUT_NECESSARY |
 			CHSC_FLAG_SIGA_SYNC_NECESSARY; /* worst case */
@@ -2427,7 +2431,7 @@ tiqdio_set_subchannel_ind(struct qdio_irq *irq_ptr, int reset_to_zero)
 		/* set to 0x10000000 to enable
 		 * time delay disablement facility */
 		u32 reserved5;
-		u32 subsystem_id;
+		struct subchannel_id schid;
 		u32 reserved6[1004];
 		struct chsc_header response;
 		u32 reserved7;
@@ -2449,7 +2453,7 @@ tiqdio_set_subchannel_ind(struct qdio_irq *irq_ptr, int reset_to_zero)
 	scssc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 	if (!scssc_area) {
 		QDIO_PRINT_WARN("No memory for setting indicators on " \
-				"subchannel x%x.\n", irq_ptr->irq);
+				"subchannel x%x.\n", irq_ptr->schid.sch_no);
 		return -ENOMEM;
 	}
 	scssc_area->request = (struct chsc_header) {
@@ -2463,7 +2467,7 @@ tiqdio_set_subchannel_ind(struct qdio_irq *irq_ptr, int reset_to_zero)
 	scssc_area->ks = QDIO_STORAGE_KEY;
 	scssc_area->kc = QDIO_STORAGE_KEY;
 	scssc_area->isc = TIQDIO_THININT_ISC;
-	scssc_area->subsystem_id = (1<<16) + irq_ptr->irq;
+	scssc_area->schid = irq_ptr->schid;
 	/* enables the time delay disablement facility. Don't care
 	 * whether it is really there (i.e. we haven't checked for
 	 * it) */
@@ -2473,12 +2477,10 @@ tiqdio_set_subchannel_ind(struct qdio_irq *irq_ptr, int reset_to_zero)
 		QDIO_PRINT_WARN("Time delay disablement facility " \
 				"not available\n");
 
-
-
 	result = chsc(scssc_area);
 	if (result) {
 		QDIO_PRINT_WARN("could not set indicators on irq x%x, " \
-				"cc=%i.\n",irq_ptr->irq,result);
+				"cc=%i.\n",irq_ptr->schid.sch_no,result);
 		result = -EIO;
 		goto out;
 	}
@@ -2534,7 +2536,7 @@ tiqdio_set_delay_target(struct qdio_irq *irq_ptr, unsigned long delay_target)
 	scsscf_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 	if (!scsscf_area) {
 		QDIO_PRINT_WARN("No memory for setting delay target on " \
-				"subchannel x%x.\n", irq_ptr->irq);
+				"subchannel x%x.\n", irq_ptr->schid.sch_no);
 		return -ENOMEM;
 	}
 	scsscf_area->request = (struct chsc_header) {
@@ -2547,7 +2549,8 @@ tiqdio_set_delay_target(struct qdio_irq *irq_ptr, unsigned long delay_target)
 	result=chsc(scsscf_area);
 	if (result) {
 		QDIO_PRINT_WARN("could not set delay target on irq x%x, " \
-				"cc=%i. Continuing.\n",irq_ptr->irq,result);
+				"cc=%i. Continuing.\n",irq_ptr->schid.sch_no,
+				result);
 		result = -EIO;
 		goto out;
 	}
@@ -2581,7 +2584,7 @@ qdio_cleanup(struct ccw_device *cdev, int how)
 	if (!irq_ptr)
 		return -ENODEV;
 
-	sprintf(dbf_text,"qcln%4x",irq_ptr->irq);
+	sprintf(dbf_text,"qcln%4x",irq_ptr->schid.sch_no);
 	QDIO_DBF_TEXT1(0,trace,dbf_text);
 	QDIO_DBF_TEXT0(0,setup,dbf_text);
 
@@ -2608,7 +2611,7 @@ qdio_shutdown(struct ccw_device *cdev, int how)
 
 	down(&irq_ptr->setting_up_sema);
 
-	sprintf(dbf_text,"qsqs%4x",irq_ptr->irq);
+	sprintf(dbf_text,"qsqs%4x",irq_ptr->schid.sch_no);
 	QDIO_DBF_TEXT1(0,trace,dbf_text);
 	QDIO_DBF_TEXT0(0,setup,dbf_text);
 
@@ -2714,7 +2717,7 @@ qdio_free(struct ccw_device *cdev)
 
 	down(&irq_ptr->setting_up_sema);
 
-	sprintf(dbf_text,"qfqs%4x",irq_ptr->irq);
+	sprintf(dbf_text,"qfqs%4x",irq_ptr->schid.sch_no);
 	QDIO_DBF_TEXT1(0,trace,dbf_text);
 	QDIO_DBF_TEXT0(0,setup,dbf_text);
 
@@ -2862,13 +2865,13 @@ qdio_establish_irq_check_for_errors(struct ccw_device *cdev, int cstat,
 	irq_ptr = cdev->private->qdio_data;
 
 	if (cstat || (dstat & ~(DEV_STAT_CHN_END|DEV_STAT_DEV_END))) {
-		sprintf(dbf_text,"ick1%4x",irq_ptr->irq);
+		sprintf(dbf_text,"ick1%4x",irq_ptr->schid.sch_no);
 		QDIO_DBF_TEXT2(1,trace,dbf_text);
 		QDIO_DBF_HEX2(0,trace,&dstat,sizeof(int));
 		QDIO_DBF_HEX2(0,trace,&cstat,sizeof(int));
 		QDIO_PRINT_ERR("received check condition on establish " \
 			       "queues on irq 0x%x (cs=x%x, ds=x%x).\n",
-			       irq_ptr->irq,cstat,dstat);
+			       irq_ptr->schid.sch_no,cstat,dstat);
 		qdio_set_state(irq_ptr,QDIO_IRQ_STATE_ERR);
 	}
 	
@@ -2878,7 +2881,7 @@ qdio_establish_irq_check_for_errors(struct ccw_device *cdev, int cstat,
 		QDIO_DBF_HEX2(0,setup,&cstat, sizeof(cstat));
 		QDIO_PRINT_ERR("establish queues on irq %04x: didn't get "
 			       "device end: dstat=%02x, cstat=%02x\n",
-			       irq_ptr->irq, dstat, cstat);
+			       irq_ptr->schid.sch_no, dstat, cstat);
 		qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 		return 1;
 	}
@@ -2890,7 +2893,7 @@ qdio_establish_irq_check_for_errors(struct ccw_device *cdev, int cstat,
 		QDIO_PRINT_ERR("establish queues on irq %04x: got "
 			       "the following devstat: dstat=%02x, "
 			       "cstat=%02x\n",
-			       irq_ptr->irq, dstat, cstat);
+			       irq_ptr->schid.sch_no, dstat, cstat);
 		qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 		return 1;
 	}
@@ -2905,7 +2908,7 @@ qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, int dstat)
 
 	irq_ptr = cdev->private->qdio_data;
 
-	sprintf(dbf_text,"qehi%4x",cdev->private->irq);
+	sprintf(dbf_text,"qehi%4x",cdev->private->sch_no);
 	QDIO_DBF_TEXT0(0,setup,dbf_text);
 	QDIO_DBF_TEXT0(0,trace,dbf_text);
 
@@ -2924,7 +2927,7 @@ qdio_initialize(struct qdio_initialize *init_data)
 	int rc;
 	char dbf_text[15];
 
-	sprintf(dbf_text,"qini%4x",init_data->cdev->private->irq);
+	sprintf(dbf_text,"qini%4x",init_data->cdev->private->sch_no);
 	QDIO_DBF_TEXT0(0,setup,dbf_text);
 	QDIO_DBF_TEXT0(0,trace,dbf_text);
 
@@ -2945,7 +2948,7 @@ qdio_allocate(struct qdio_initialize *init_data)
 	struct qdio_irq *irq_ptr;
 	char dbf_text[15];
 
-	sprintf(dbf_text,"qalc%4x",init_data->cdev->private->irq);
+	sprintf(dbf_text,"qalc%4x",init_data->cdev->private->sch_no);
 	QDIO_DBF_TEXT0(0,setup,dbf_text);
 	QDIO_DBF_TEXT0(0,trace,dbf_text);
 	if ( (init_data->no_input_qs>QDIO_MAX_QUEUES_PER_IRQ) ||
@@ -3018,7 +3021,7 @@ int qdio_fill_irq(struct qdio_initialize *init_data)
 
 	irq_ptr->int_parm=init_data->int_parm;
 
-	irq_ptr->irq = init_data->cdev->private->irq;
+	irq_ptr->schid = ccw_device_get_subchannel_id(init_data->cdev);
 	irq_ptr->no_input_qs=init_data->no_input_qs;
 	irq_ptr->no_output_qs=init_data->no_output_qs;
 
@@ -3038,7 +3041,7 @@ int qdio_fill_irq(struct qdio_initialize *init_data)
 		QDIO_DBF_HEX1(0,setup,&irq_ptr->dev_st_chg_ind,sizeof(void*));
 		if (!irq_ptr->dev_st_chg_ind) {
 			QDIO_PRINT_WARN("no indicator location available " \
-					"for irq 0x%x\n",irq_ptr->irq);
+					"for irq 0x%x\n",irq_ptr->schid.sch_no);
 			qdio_release_irq_memory(irq_ptr);
 			return -ENOBUFS;
 		}
@@ -3169,7 +3172,7 @@ qdio_establish(struct qdio_initialize *init_data)
 		tiqdio_set_delay_target(irq_ptr,TIQDIO_DELAY_TARGET);
 	}
 
-	sprintf(dbf_text,"qest%4x",cdev->private->irq);
+	sprintf(dbf_text,"qest%4x",cdev->private->sch_no);
 	QDIO_DBF_TEXT0(0,setup,dbf_text);
 	QDIO_DBF_TEXT0(0,trace,dbf_text);
 
@@ -3197,7 +3200,7 @@ qdio_establish(struct qdio_initialize *init_data)
 		}
 		QDIO_PRINT_WARN("establish queues on irq %04x: do_IO " \
                            "returned %i, next try returned %i\n",
-                           irq_ptr->irq,result,result2);
+                           irq_ptr->schid.sch_no,result,result2);
 		result=result2;
 		if (result)
 			ccw_device_set_timeout(cdev, 0);
@@ -3270,7 +3273,7 @@ qdio_activate(struct ccw_device *cdev, int flags)
 		goto out;
 	}
 
-	sprintf(dbf_text,"qact%4x", irq_ptr->irq);
+	sprintf(dbf_text,"qact%4x", irq_ptr->schid.sch_no);
 	QDIO_DBF_TEXT2(0,setup,dbf_text);
 	QDIO_DBF_TEXT2(0,trace,dbf_text);
 
@@ -3297,7 +3300,7 @@ qdio_activate(struct ccw_device *cdev, int flags)
 		}
 		QDIO_PRINT_WARN("activate queues on irq %04x: do_IO " \
                            "returned %i, next try returned %i\n",
-                           irq_ptr->irq,result,result2);
+                           irq_ptr->schid.sch_no,result,result2);
 		result=result2;
 	}
 
@@ -3509,7 +3512,7 @@ do_QDIO(struct ccw_device *cdev,unsigned int callflags,
 #ifdef CONFIG_QDIO_DEBUG
 	char dbf_text[20];
 
-	sprintf(dbf_text,"doQD%04x",cdev->private->irq);
+	sprintf(dbf_text,"doQD%04x",cdev->private->sch_no);
  	QDIO_DBF_TEXT3(0,trace,dbf_text);
 #endif /* CONFIG_QDIO_DEBUG */
 
diff --git a/drivers/s390/cio/qdio.h b/drivers/s390/cio/qdio.h
index b5d303e79a24..43b840af5300 100644
--- a/drivers/s390/cio/qdio.h
+++ b/drivers/s390/cio/qdio.h
@@ -3,7 +3,9 @@
 
 #include <asm/page.h>
 
-#define VERSION_CIO_QDIO_H "$Revision: 1.37 $"
+#include "schid.h"
+
+#define VERSION_CIO_QDIO_H "$Revision: 1.40 $"
 
 #ifdef CONFIG_QDIO_DEBUG
 #define QDIO_VERBOSE_LEVEL 9
@@ -317,7 +319,7 @@ do_eqbs(unsigned long sch, unsigned char *state, int queue,
 
 
 static inline int
-do_siga_sync(unsigned int irq, unsigned int mask1, unsigned int mask2)
+do_siga_sync(struct subchannel_id schid, unsigned int mask1, unsigned int mask2)
 {
 	int cc;
 
@@ -331,7 +333,7 @@ do_siga_sync(unsigned int irq, unsigned int mask1, unsigned int mask2)
 		"ipm	%0	\n\t"
 		"srl	%0,28	\n\t"
 		: "=d" (cc)
-		: "d" (irq), "d" (mask1), "d" (mask2)
+		: "d" (schid), "d" (mask1), "d" (mask2)
 		: "cc", "0", "1", "2", "3"
 		);
 #else /* CONFIG_ARCH_S390X */
@@ -344,7 +346,7 @@ do_siga_sync(unsigned int irq, unsigned int mask1, unsigned int mask2)
 		"ipm	%0	\n\t"
 		"srl	%0,28	\n\t"
 		: "=d" (cc)
-		: "d" (irq), "d" (mask1), "d" (mask2)
+		: "d" (schid), "d" (mask1), "d" (mask2)
 		: "cc", "0", "1", "2", "3"
 		);
 #endif /* CONFIG_ARCH_S390X */
@@ -352,7 +354,7 @@ do_siga_sync(unsigned int irq, unsigned int mask1, unsigned int mask2)
 }
 
 static inline int
-do_siga_input(unsigned int irq, unsigned int mask)
+do_siga_input(struct subchannel_id schid, unsigned int mask)
 {
 	int cc;
 
@@ -365,7 +367,7 @@ do_siga_input(unsigned int irq, unsigned int mask)
 		"ipm	%0	\n\t"
 		"srl	%0,28	\n\t"
 		: "=d" (cc)
-		: "d" (irq), "d" (mask)
+		: "d" (schid), "d" (mask)
 		: "cc", "0", "1", "2", "memory"
 		);
 #else /* CONFIG_ARCH_S390X */
@@ -377,7 +379,7 @@ do_siga_input(unsigned int irq, unsigned int mask)
 		"ipm	%0	\n\t"
 		"srl	%0,28	\n\t"
 		: "=d" (cc)
-		: "d" (irq), "d" (mask)
+		: "d" (schid), "d" (mask)
 		: "cc", "0", "1", "2", "memory"
 		);
 #endif /* CONFIG_ARCH_S390X */
@@ -386,7 +388,7 @@ do_siga_input(unsigned int irq, unsigned int mask)
 }
 
 static inline int
-do_siga_output(unsigned long irq, unsigned long mask, __u32 *bb,
+do_siga_output(unsigned long schid, unsigned long mask, __u32 *bb,
 	       unsigned int fc)
 {
 	int cc;
@@ -418,7 +420,7 @@ do_siga_output(unsigned long irq, unsigned long mask, __u32 *bb,
 		".long	0b,2b	\n\t"
 		".previous	\n\t"
 		: "=d" (cc), "=d" (busy_bit)
-		: "d" (irq), "d" (mask),
+		: "d" (schid), "d" (mask),
 		"i" (QDIO_SIGA_ERROR_ACCESS_EXCEPTION)
 		: "cc", "0", "1", "2", "memory"
 		);
@@ -443,7 +445,7 @@ do_siga_output(unsigned long irq, unsigned long mask, __u32 *bb,
 		".quad	0b,1b	\n\t"
 		".previous	\n\t"
 		: "=d" (cc), "=d" (busy_bit)
-		: "d" (irq), "d" (mask),
+		: "d" (schid), "d" (mask),
 		"i" (QDIO_SIGA_ERROR_ACCESS_EXCEPTION), "d" (fc)
 		: "cc", "0", "1", "2", "memory"
 		);
@@ -554,7 +556,7 @@ struct qdio_q {
 	__u32 * dev_st_chg_ind;
 
 	int is_input_q;
-	int irq;
+	struct subchannel_id schid;
 	struct ccw_device *cdev;
 
 	unsigned int is_iqdio_q;
@@ -649,7 +651,7 @@ struct qdio_irq {
 	__u32 * volatile dev_st_chg_ind;
 
 	unsigned long int_parm;
-	int irq;
+	struct subchannel_id schid;
 
 	unsigned int is_iqdio_irq;
 	unsigned int is_thinint_irq;
diff --git a/drivers/s390/cio/schid.h b/drivers/s390/cio/schid.h
new file mode 100644
index 000000000000..220d97882341
--- /dev/null
+++ b/drivers/s390/cio/schid.h
@@ -0,0 +1,25 @@
+#ifndef S390_SCHID_H
+#define S390_SCHID_H
+
+struct subchannel_id {
+	__u32 reserved:15;
+	__u32 one:1;
+	__u32 sch_no:16;
+} __attribute__ ((packed,aligned(4)));
+
+
+/* Helper function for sane state of pre-allocated subchannel_id. */
+static inline void
+init_subchannel_id(struct subchannel_id *schid)
+{
+	memset(schid, 0, sizeof(struct subchannel_id));
+	schid->one = 1;
+}
+
+static inline int
+schid_equal(struct subchannel_id *schid1, struct subchannel_id *schid2)
+{
+	return !memcmp(schid1, schid2, sizeof(struct subchannel_id));
+}
+
+#endif /* S390_SCHID_H */