1 files changed, 619 insertions, 409 deletions

diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
index 007aaeb4f53..e3bf885f4a6 100644
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -1,21 +1,26 @@
 /*
- *  drivers/s390/cio/chsc.c
  *   S/390 common I/O routines -- channel subsystem call
  *
- *    Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
- *			      IBM Corporation
+ *    Copyright IBM Corp. 1999,2012
  *    Author(s): Ingo Adlung (adlung@de.ibm.com)
  *		 Cornelia Huck (cornelia.huck@de.ibm.com)
  *		 Arnd Bergmann (arndb@de.ibm.com)
  */
 
+#define KMSG_COMPONENT "cio"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/device.h>
+#include <linux/pci.h>
 
 #include <asm/cio.h>
 #include <asm/chpid.h>
+#include <asm/chsc.h>
+#include <asm/crw.h>
+#include <asm/isc.h>
 
 #include "css.h"
 #include "cio.h"
@@ -25,8 +30,16 @@
 #include "chsc.h"
 
 static void *sei_page;
+static void *chsc_page;
+static DEFINE_SPINLOCK(chsc_page_lock);
 
-static int chsc_error_from_response(int response)
+/**
+ * chsc_error_from_response() - convert a chsc response to an error
+ * @response: chsc response code
+ *
+ * Returns an appropriate Linux error code for @response.
+ */
+int chsc_error_from_response(int response)
 {
 	switch (response) {
 	case 0x0001:
@@ -37,13 +50,21 @@ static int chsc_error_from_response(int response)
 	case 0x0007:
 	case 0x0008:
 	case 0x000a:
+	case 0x0104:
 		return -EINVAL;
 	case 0x0004:
 		return -EOPNOTSUPP;
+	case 0x000b:
+	case 0x0107:		/* "Channel busy" for the op 0x003d */
+		return -EBUSY;
+	case 0x0100:
+	case 0x0102:
+		return -ENOMEM;
 	default:
 		return -EIO;
 	}
 }
+EXPORT_SYMBOL_GPL(chsc_error_from_response);
 
 struct chsc_ssd_area {
 	struct chsc_header request;
@@ -71,17 +92,15 @@ struct chsc_ssd_area {
 
 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
 {
-	unsigned long page;
 	struct chsc_ssd_area *ssd_area;
 	int ccode;
 	int ret;
 	int i;
 	int mask;
 
-	page = get_zeroed_page(GFP_KERNEL | GFP_DMA);
-	if (!page)
-		return -ENOMEM;
-	ssd_area = (struct chsc_ssd_area *) page;
+	spin_lock_irq(&chsc_page_lock);
+	memset(chsc_page, 0, PAGE_SIZE);
+	ssd_area = chsc_page;
 	ssd_area->request.length = 0x0010;
 	ssd_area->request.code = 0x0004;
 	ssd_area->ssid = schid.ssid;
@@ -92,25 +111,25 @@ int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
 	/* Check response. */
 	if (ccode > 0) {
 		ret = (ccode == 3) ? -ENODEV : -EBUSY;
-		goto out_free;
+		goto out;
 	}
 	ret = chsc_error_from_response(ssd_area->response.code);
 	if (ret != 0) {
 		CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
 			      schid.ssid, schid.sch_no,
 			      ssd_area->response.code);
-		goto out_free;
+		goto out;
 	}
 	if (!ssd_area->sch_valid) {
 		ret = -ENODEV;
-		goto out_free;
+		goto out;
 	}
 	/* Copy data */
 	ret = 0;
 	memset(ssd, 0, sizeof(struct chsc_ssd_info));
 	if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
 	    (ssd_area->st != SUBCHANNEL_TYPE_MSG))
-		goto out_free;
+		goto out;
 	ssd->path_mask = ssd_area->path_mask;
 	ssd->fla_valid_mask = ssd_area->fla_valid_mask;
 	for (i = 0; i < 8; i++) {
@@ -122,82 +141,76 @@ int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
 		if (ssd_area->fla_valid_mask & mask)
 			ssd->fla[i] = ssd_area->fla[i];
 	}
-out_free:
-	free_page(page);
+out:
+	spin_unlock_irq(&chsc_page_lock);
 	return ret;
 }
 
-static int check_for_io_on_path(struct subchannel *sch, int mask)
+/**
+ * chsc_ssqd() - store subchannel QDIO data (SSQD)
+ * @schid: id of the subchannel on which SSQD is performed
+ * @ssqd: request and response block for SSQD
+ *
+ * Returns 0 on success.
+ */
+int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd)
 {
-	int cc;
+	memset(ssqd, 0, sizeof(*ssqd));
+	ssqd->request.length = 0x0010;
+	ssqd->request.code = 0x0024;
+	ssqd->first_sch = schid.sch_no;
+	ssqd->last_sch = schid.sch_no;
+	ssqd->ssid = schid.ssid;
+
+	if (chsc(ssqd))
+		return -EIO;
 
-	cc = stsch(sch->schid, &sch->schib);
-	if (cc)
-		return 0;
-	if (sch->schib.scsw.actl && sch->schib.pmcw.lpum == mask)
-		return 1;
-	return 0;
+	return chsc_error_from_response(ssqd->response.code);
 }
+EXPORT_SYMBOL_GPL(chsc_ssqd);
 
-static void terminate_internal_io(struct subchannel *sch)
+/**
+ * chsc_sadc() - set adapter device controls (SADC)
+ * @schid: id of the subchannel on which SADC is performed
+ * @scssc: request and response block for SADC
+ * @summary_indicator_addr: summary indicator address
+ * @subchannel_indicator_addr: subchannel indicator address
+ *
+ * Returns 0 on success.
+ */
+int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc,
+	      u64 summary_indicator_addr, u64 subchannel_indicator_addr)
 {
-	if (cio_clear(sch)) {
-		/* Recheck device in case clear failed. */
-		sch->lpm = 0;
-		if (device_trigger_verify(sch) != 0)
-			css_schedule_eval(sch->schid);
-		return;
-	}
-	/* Request retry of internal operation. */
-	device_set_intretry(sch);
-	/* Call handler. */
-	if (sch->driver && sch->driver->termination)
-		sch->driver->termination(sch);
+	memset(scssc, 0, sizeof(*scssc));
+	scssc->request.length = 0x0fe0;
+	scssc->request.code = 0x0021;
+	scssc->operation_code = 0;
+
+	scssc->summary_indicator_addr = summary_indicator_addr;
+	scssc->subchannel_indicator_addr = subchannel_indicator_addr;
+
+	scssc->ks = PAGE_DEFAULT_KEY >> 4;
+	scssc->kc = PAGE_DEFAULT_KEY >> 4;
+	scssc->isc = QDIO_AIRQ_ISC;
+	scssc->schid = schid;
+
+	/* enable the time delay disablement facility */
+	if (css_general_characteristics.aif_tdd)
+		scssc->word_with_d_bit = 0x10000000;
+
+	if (chsc(scssc))
+		return -EIO;
+
+	return chsc_error_from_response(scssc->response.code);
 }
+EXPORT_SYMBOL_GPL(chsc_sadc);
 
 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
 {
-	int j;
-	int mask;
-	struct chp_id *chpid = data;
-	struct schib schib;
-
-	for (j = 0; j < 8; j++) {
-		mask = 0x80 >> j;
-		if ((sch->schib.pmcw.pim & mask) &&
-		    (sch->schib.pmcw.chpid[j] == chpid->id))
-			break;
-	}
-	if (j >= 8)
-		return 0;
-
 	spin_lock_irq(sch->lock);
-
-	stsch(sch->schid, &schib);
-	if (!css_sch_is_valid(&schib))
-		goto out_unreg;
-	memcpy(&sch->schib, &schib, sizeof(struct schib));
-	/* Check for single path devices. */
-	if (sch->schib.pmcw.pim == 0x80)
-		goto out_unreg;
-
-	if (check_for_io_on_path(sch, mask)) {
-		if (device_is_online(sch))
-			device_kill_io(sch);
-		else {
-			terminate_internal_io(sch);
-			/* Re-start path verification. */
-			if (sch->driver && sch->driver->verify)
-				sch->driver->verify(sch);
-		}
-	} else {
-		/* trigger path verification. */
-		if (sch->driver && sch->driver->verify)
-			sch->driver->verify(sch);
-		else if (sch->lpm == mask)
+	if (sch->driver && sch->driver->chp_event)
+		if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
 			goto out_unreg;
-	}
-
 	spin_unlock_irq(sch->lock);
 	return 0;
 
@@ -211,99 +224,43 @@ out_unreg:
 void chsc_chp_offline(struct chp_id chpid)
 {
 	char dbf_txt[15];
+	struct chp_link link;
 
 	sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
 	CIO_TRACE_EVENT(2, dbf_txt);
 
 	if (chp_get_status(chpid) <= 0)
 		return;
-	for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &chpid);
-}
-
-static int s390_process_res_acc_new_sch(struct subchannel_id schid, void *data)
-{
-	struct schib schib;
-	/*
-	 * We don't know the device yet, but since a path
-	 * may be available now to the device we'll have
-	 * to do recognition again.
-	 * Since we don't have any idea about which chpid
-	 * that beast may be on we'll have to do a stsch
-	 * on all devices, grr...
-	 */
-	if (stsch_err(schid, &schib))
-		/* We're through */
-		return -ENXIO;
-
-	/* Put it on the slow path. */
-	css_schedule_eval(schid);
-	return 0;
-}
-
-struct res_acc_data {
-	struct chp_id chpid;
-	u32 fla_mask;
-	u16 fla;
-};
-
-static int get_res_chpid_mask(struct chsc_ssd_info *ssd,
-			      struct res_acc_data *data)
-{
-	int i;
-	int mask;
-
-	for (i = 0; i < 8; i++) {
-		mask = 0x80 >> i;
-		if (!(ssd->path_mask & mask))
-			continue;
-		if (!chp_id_is_equal(&ssd->chpid[i], &data->chpid))
-			continue;
-		if ((ssd->fla_valid_mask & mask) &&
-		    ((ssd->fla[i] & data->fla_mask) != data->fla))
-			continue;
-		return mask;
-	}
-	return 0;
+	memset(&link, 0, sizeof(struct chp_link));
+	link.chpid = chpid;
+	/* Wait until previous actions have settled. */
+	css_wait_for_slow_path();
+	for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
 }
 
 static int __s390_process_res_acc(struct subchannel *sch, void *data)
 {
-	int chp_mask, old_lpm;
-	struct res_acc_data *res_data = data;
-
 	spin_lock_irq(sch->lock);
-	chp_mask = get_res_chpid_mask(&sch->ssd_info, res_data);
-	if (chp_mask == 0)
-		goto out;
-	if (stsch(sch->schid, &sch->schib))
-		goto out;
-	old_lpm = sch->lpm;
-	sch->lpm = ((sch->schib.pmcw.pim &
-		     sch->schib.pmcw.pam &
-		     sch->schib.pmcw.pom)
-		    | chp_mask) & sch->opm;
-	if (!old_lpm && sch->lpm)
-		device_trigger_reprobe(sch);
-	else if (sch->driver && sch->driver->verify)
-		sch->driver->verify(sch);
-out:
+	if (sch->driver && sch->driver->chp_event)
+		sch->driver->chp_event(sch, data, CHP_ONLINE);
 	spin_unlock_irq(sch->lock);
 
 	return 0;
 }
 
-static void s390_process_res_acc (struct res_acc_data *res_data)
+static void s390_process_res_acc(struct chp_link *link)
 {
 	char dbf_txt[15];
 
-	sprintf(dbf_txt, "accpr%x.%02x", res_data->chpid.cssid,
-		res_data->chpid.id);
+	sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
+		link->chpid.id);
 	CIO_TRACE_EVENT( 2, dbf_txt);
-	if (res_data->fla != 0) {
-		sprintf(dbf_txt, "fla%x", res_data->fla);
+	if (link->fla != 0) {
+		sprintf(dbf_txt, "fla%x", link->fla);
 		CIO_TRACE_EVENT( 2, dbf_txt);
 	}
-
+	/* Wait until previous actions have settled. */
+	css_wait_for_slow_path();
 	/*
 	 * I/O resources may have become accessible.
 	 * Scan through all subchannels that may be concerned and
@@ -311,8 +268,8 @@ static void s390_process_res_acc (struct res_acc_data *res_data)
 	 * The more information we have (info), the less scanning
 	 * will we have to do.
 	 */
-	for_each_subchannel_staged(__s390_process_res_acc,
-				   s390_process_res_acc_new_sch, res_data);
+	for_each_subchannel_staged(__s390_process_res_acc, NULL, link);
+	css_schedule_reprobe();
 }
 
 static int
@@ -345,26 +302,46 @@ __get_chpid_from_lir(void *data)
 	return (u16) (lir->indesc[0]&0x000000ff);
 }
 
-struct chsc_sei_area {
-	struct chsc_header request;
+struct chsc_sei_nt0_area {
+	u8  flags;
+	u8  vf;				/* validity flags */
+	u8  rs;				/* reporting source */
+	u8  cc;				/* content code */
+	u16 fla;			/* full link address */
+	u16 rsid;			/* reporting source id */
 	u32 reserved1;
 	u32 reserved2;
-	u32 reserved3;
-	struct chsc_header response;
-	u32 reserved4;
-	u8  flags;
-	u8  vf;		/* validity flags */
-	u8  rs;		/* reporting source */
-	u8  cc;		/* content code */
-	u16 fla;	/* full link address */
-	u16 rsid;	/* reporting source id */
-	u32 reserved5;
-	u32 reserved6;
-	u8 ccdf[4096 - 16 - 24];	/* content-code dependent field */
 	/* ccdf has to be big enough for a link-incident record */
-} __attribute__ ((packed));
-
-static void chsc_process_sei_link_incident(struct chsc_sei_area *sei_area)
+	u8  ccdf[PAGE_SIZE - 24 - 16];	/* content-code dependent field */
+} __packed;
+
+struct chsc_sei_nt2_area {
+	u8  flags;			/* p and v bit */
+	u8  reserved1;
+	u8  reserved2;
+	u8  cc;				/* content code */
+	u32 reserved3[13];
+	u8  ccdf[PAGE_SIZE - 24 - 56];	/* content-code dependent field */
+} __packed;
+
+#define CHSC_SEI_NT0	(1ULL << 63)
+#define CHSC_SEI_NT2	(1ULL << 61)
+
+struct chsc_sei {
+	struct chsc_header request;
+	u32 reserved1;
+	u64 ntsm;			/* notification type mask */
+	struct chsc_header response;
+	u32 :24;
+	u8 nt;
+	union {
+		struct chsc_sei_nt0_area nt0_area;
+		struct chsc_sei_nt2_area nt2_area;
+		u8 nt_area[PAGE_SIZE - 24];
+	} u;
+} __packed;
+
+static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
 {
 	struct chp_id chpid;
 	int id;
@@ -383,9 +360,9 @@ static void chsc_process_sei_link_incident(struct chsc_sei_area *sei_area)
 	}
 }
 
-static void chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
+static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
 {
-	struct res_acc_data res_data;
+	struct chp_link link;
 	struct chp_id chpid;
 	int status;
 
@@ -401,18 +378,48 @@ static void chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
 		chp_new(chpid);
 	else if (!status)
 		return;
-	memset(&res_data, 0, sizeof(struct res_acc_data));
-	res_data.chpid = chpid;
+	memset(&link, 0, sizeof(struct chp_link));
+	link.chpid = chpid;
 	if ((sei_area->vf & 0xc0) != 0) {
-		res_data.fla = sei_area->fla;
+		link.fla = sei_area->fla;
 		if ((sei_area->vf & 0xc0) == 0xc0)
 			/* full link address */
-			res_data.fla_mask = 0xffff;
+			link.fla_mask = 0xffff;
 		else
 			/* link address */
-			res_data.fla_mask = 0xff00;
+			link.fla_mask = 0xff00;
+	}
+	s390_process_res_acc(&link);
+}
+
+static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
+{
+	struct channel_path *chp;
+	struct chp_id chpid;
+	u8 *data;
+	int num;
+
+	CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
+	if (sei_area->rs != 0)
+		return;
+	data = sei_area->ccdf;
+	chp_id_init(&chpid);
+	for (num = 0; num <= __MAX_CHPID; num++) {
+		if (!chp_test_bit(data, num))
+			continue;
+		chpid.id = num;
+
+		CIO_CRW_EVENT(4, "Update information for channel path "
+			      "%x.%02x\n", chpid.cssid, chpid.id);
+		chp = chpid_to_chp(chpid);
+		if (!chp) {
+			chp_new(chpid);
+			continue;
+		}
+		mutex_lock(&chp->lock);
+		chp_update_desc(chp);
+		mutex_unlock(&chp->lock);
 	}
-	s390_process_res_acc(&res_data);
 }
 
 struct chp_config_data {
@@ -421,11 +428,12 @@ struct chp_config_data {
 	u8 pc;
 };
 
-static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area)
+static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
 {
 	struct chp_config_data *data;
 	struct chp_id chpid;
 	int num;
+	char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
 
 	CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
 	if (sei_area->rs != 0)
@@ -436,8 +444,8 @@ static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area)
 		if (!chp_test_bit(data->map, num))
 			continue;
 		chpid.id = num;
-		printk(KERN_WARNING "cio: processing configure event %d for "
-		       "chpid %x.%02x\n", data->op, chpid.cssid, chpid.id);
+		pr_notice("Processing %s for channel path %x.%02x\n",
+			  events[data->op], chpid.cssid, chpid.id);
 		switch (data->op) {
 		case 0:
 			chp_cfg_schedule(chpid, 1);
@@ -452,165 +460,184 @@ static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area)
 	}
 }
 
-static void chsc_process_sei(struct chsc_sei_area *sei_area)
+static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
 {
-	/* Check if we might have lost some information. */
-	if (sei_area->flags & 0x40) {
-		CIO_CRW_EVENT(2, "chsc: event overflow\n");
-		css_schedule_eval_all();
+	int ret;
+
+	CIO_CRW_EVENT(4, "chsc: scm change notification\n");
+	if (sei_area->rs != 7)
+		return;
+
+	ret = scm_update_information();
+	if (ret)
+		CIO_CRW_EVENT(0, "chsc: updating change notification"
+			      " failed (rc=%d).\n", ret);
+}
+
+static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
+{
+	int ret;
+
+	CIO_CRW_EVENT(4, "chsc: scm available information\n");
+	if (sei_area->rs != 7)
+		return;
+
+	ret = scm_process_availability_information();
+	if (ret)
+		CIO_CRW_EVENT(0, "chsc: process availability information"
+			      " failed (rc=%d).\n", ret);
+}
+
+static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
+{
+	switch (sei_area->cc) {
+	case 1:
+		zpci_event_error(sei_area->ccdf);
+		break;
+	case 2:
+		zpci_event_availability(sei_area->ccdf);
+		break;
+	default:
+		CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
+			      sei_area->cc);
+		break;
 	}
+}
+
+static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
+{
 	/* which kind of information was stored? */
 	switch (sei_area->cc) {
 	case 1: /* link incident*/
 		chsc_process_sei_link_incident(sei_area);
 		break;
-	case 2: /* i/o resource accessibiliy */
+	case 2: /* i/o resource accessibility */
 		chsc_process_sei_res_acc(sei_area);
 		break;
+	case 7: /* channel-path-availability information */
+		chsc_process_sei_chp_avail(sei_area);
+		break;
 	case 8: /* channel-path-configuration notification */
 		chsc_process_sei_chp_config(sei_area);
 		break;
+	case 12: /* scm change notification */
+		chsc_process_sei_scm_change(sei_area);
+		break;
+	case 14: /* scm available notification */
+		chsc_process_sei_scm_avail(sei_area);
+		break;
 	default: /* other stuff */
-		CIO_CRW_EVENT(4, "chsc: unhandled sei content code %d\n",
+		CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
 			      sei_area->cc);
 		break;
 	}
+
+	/* Check if we might have lost some information. */
+	if (sei_area->flags & 0x40) {
+		CIO_CRW_EVENT(2, "chsc: event overflow\n");
+		css_schedule_eval_all();
+	}
 }
 
-void chsc_process_crw(void)
+static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
 {
-	struct chsc_sei_area *sei_area;
+	static int ntsm_unsupported;
 
-	if (!sei_page)
-		return;
-	/* Access to sei_page is serialized through machine check handler
-	 * thread, so no need for locking. */
-	sei_area = sei_page;
-
-	CIO_TRACE_EVENT( 2, "prcss");
-	do {
-		memset(sei_area, 0, sizeof(*sei_area));
-		sei_area->request.length = 0x0010;
-		sei_area->request.code = 0x000e;
-		if (chsc(sei_area))
+	while (true) {
+		memset(sei, 0, sizeof(*sei));
+		sei->request.length = 0x0010;
+		sei->request.code = 0x000e;
+		if (!ntsm_unsupported)
+			sei->ntsm = ntsm;
+
+		if (chsc(sei))
 			break;
 
-		if (sei_area->response.code == 0x0001) {
-			CIO_CRW_EVENT(4, "chsc: sei successful\n");
-			chsc_process_sei(sei_area);
-		} else {
-			CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
-				      sei_area->response.code);
+		if (sei->response.code != 0x0001) {
+			CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n",
+				      sei->response.code, sei->ntsm);
+
+			if (sei->response.code == 3 && sei->ntsm) {
+				/* Fallback for old firmware. */
+				ntsm_unsupported = 1;
+				continue;
+			}
 			break;
 		}
-	} while (sei_area->flags & 0x80);
-}
 
-static int __chp_add_new_sch(struct subchannel_id schid, void *data)
-{
-	struct schib schib;
-
-	if (stsch_err(schid, &schib))
-		/* We're through */
-		return -ENXIO;
+		CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
+		switch (sei->nt) {
+		case 0:
+			chsc_process_sei_nt0(&sei->u.nt0_area);
+			break;
+		case 2:
+			chsc_process_sei_nt2(&sei->u.nt2_area);
+			break;
+		default:
+			CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
+			break;
+		}
 
-	/* Put it on the slow path. */
-	css_schedule_eval(schid);
-	return 0;
+		if (!(sei->u.nt0_area.flags & 0x80))
+			break;
+	}
 }
 
-
-static int __chp_add(struct subchannel *sch, void *data)
+/*
+ * Handle channel subsystem related CRWs.
+ * Use store event information to find out what's going on.
+ *
+ * Note: Access to sei_page is serialized through machine check handler
+ * thread, so no need for locking.
+ */
+static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 {
-	int i, mask;
-	struct chp_id *chpid = data;
+	struct chsc_sei *sei = sei_page;
 
-	spin_lock_irq(sch->lock);
-	for (i=0; i<8; i++) {
-		mask = 0x80 >> i;
-		if ((sch->schib.pmcw.pim & mask) &&
-		    (sch->schib.pmcw.chpid[i] == chpid->id))
-			break;
-	}
-	if (i==8) {
-		spin_unlock_irq(sch->lock);
-		return 0;
-	}
-	if (stsch(sch->schid, &sch->schib)) {
-		spin_unlock_irq(sch->lock);
-		css_schedule_eval(sch->schid);
-		return 0;
+	if (overflow) {
+		css_schedule_eval_all();
+		return;
 	}
-	sch->lpm = ((sch->schib.pmcw.pim &
-		     sch->schib.pmcw.pam &
-		     sch->schib.pmcw.pom)
-		    | mask) & sch->opm;
-
-	if (sch->driver && sch->driver->verify)
-		sch->driver->verify(sch);
+	CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
+		      "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
+		      crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
+		      crw0->erc, crw0->rsid);
 
-	spin_unlock_irq(sch->lock);
-
-	return 0;
+	CIO_TRACE_EVENT(2, "prcss");
+	chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
 }
 
 void chsc_chp_online(struct chp_id chpid)
 {
 	char dbf_txt[15];
+	struct chp_link link;
 
 	sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 	CIO_TRACE_EVENT(2, dbf_txt);
 
-	if (chp_get_status(chpid) != 0)
-		for_each_subchannel_staged(__chp_add, __chp_add_new_sch,
-					   &chpid);
+	if (chp_get_status(chpid) != 0) {
+		memset(&link, 0, sizeof(struct chp_link));
+		link.chpid = chpid;
+		/* Wait until previous actions have settled. */
+		css_wait_for_slow_path();
+		for_each_subchannel_staged(__s390_process_res_acc, NULL,
+					   &link);
+		css_schedule_reprobe();
+	}
 }
 
 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 					 struct chp_id chpid, int on)
 {
-	int chp, old_lpm;
-	int mask;
 	unsigned long flags;
+	struct chp_link link;
 
+	memset(&link, 0, sizeof(struct chp_link));
+	link.chpid = chpid;
 	spin_lock_irqsave(sch->lock, flags);
-	old_lpm = sch->lpm;
-	for (chp = 0; chp < 8; chp++) {
-		mask = 0x80 >> chp;
-		if (!(sch->ssd_info.path_mask & mask))
-			continue;
-		if (!chp_id_is_equal(&sch->ssd_info.chpid[chp], &chpid))
-			continue;
-
-		if (on) {
-			sch->opm |= mask;
-			sch->lpm |= mask;
-			if (!old_lpm)
-				device_trigger_reprobe(sch);
-			else if (sch->driver && sch->driver->verify)
-				sch->driver->verify(sch);
-			break;
-		}
-		sch->opm &= ~mask;
-		sch->lpm &= ~mask;
-		if (check_for_io_on_path(sch, mask)) {
-			if (device_is_online(sch))
-				/* Path verification is done after killing. */
-				device_kill_io(sch);
-			else {
-				/* Kill and retry internal I/O. */
-				terminate_internal_io(sch);
-				/* Re-start path verification. */
-				if (sch->driver && sch->driver->verify)
-					sch->driver->verify(sch);
-			}
-		} else if (!sch->lpm) {
-			if (device_trigger_verify(sch) != 0)
-				css_schedule_eval(sch->schid);
-		} else if (sch->driver && sch->driver->verify)
-			sch->driver->verify(sch);
-		break;
-	}
+	if (sch->driver && sch->driver->chp_event)
+		sch->driver->chp_event(sch, &link,
+				       on ? CHP_VARY_ON : CHP_VARY_OFF);
 	spin_unlock_irqrestore(sch->lock, flags);
 }
 
@@ -630,19 +657,6 @@ static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 	return 0;
 }
 
-static int
-__s390_vary_chpid_on(struct subchannel_id schid, void *data)
-{
-	struct schib schib;
-
-	if (stsch_err(schid, &schib))
-		/* We're through */
-		return -ENXIO;
-	/* Put it on the slow path. */
-	css_schedule_eval(schid);
-	return 0;
-}
-
 /**
  * chsc_chp_vary - propagate channel-path vary operation to subchannels
  * @chpid: channl-path ID
@@ -650,14 +664,20 @@ __s390_vary_chpid_on(struct subchannel_id schid, void *data)
  */
 int chsc_chp_vary(struct chp_id chpid, int on)
 {
+	struct channel_path *chp = chpid_to_chp(chpid);
+
+	/* Wait until previous actions have settled. */
+	css_wait_for_slow_path();
 	/*
 	 * Redo PathVerification on the devices the chpid connects to
 	 */
-
-	if (on)
+	if (on) {
+		/* Try to update the channel path description. */
+		chp_update_desc(chp);
 		for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
-					   __s390_vary_chpid_on, &chpid);
-	else
+					   NULL, &chpid);
+		css_schedule_reprobe();
+	} else
 		for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 					   NULL, &chpid);
 
@@ -699,8 +719,7 @@ cleanup:
 	return ret;
 }
 
-static int
-__chsc_do_secm(struct channel_subsystem *css, int enable, void *page)
+int __chsc_do_secm(struct channel_subsystem *css, int enable)
 {
 	struct {
 		struct chsc_header request;
@@ -721,63 +740,61 @@ __chsc_do_secm(struct channel_subsystem *css, int enable, void *page)
 	} __attribute__ ((packed)) *secm_area;
 	int ret, ccode;
 
-	secm_area = page;
+	spin_lock_irq(&chsc_page_lock);
+	memset(chsc_page, 0, PAGE_SIZE);
+	secm_area = chsc_page;
 	secm_area->request.length = 0x0050;
 	secm_area->request.code = 0x0016;
 
-	secm_area->key = PAGE_DEFAULT_KEY;
+	secm_area->key = PAGE_DEFAULT_KEY >> 4;
 	secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
 	secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
 
 	secm_area->operation_code = enable ? 0 : 1;
 
 	ccode = chsc(secm_area);
-	if (ccode > 0)
-		return (ccode == 3) ? -ENODEV : -EBUSY;
+	if (ccode > 0) {
+		ret = (ccode == 3) ? -ENODEV : -EBUSY;
+		goto out;
+	}
 
 	switch (secm_area->response.code) {
 	case 0x0102:
 	case 0x0103:
 		ret = -EINVAL;
+		break;
 	default:
 		ret = chsc_error_from_response(secm_area->response.code);
 	}
 	if (ret != 0)
 		CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 			      secm_area->response.code);
+out:
+	spin_unlock_irq(&chsc_page_lock);
 	return ret;
 }
 
 int
 chsc_secm(struct channel_subsystem *css, int enable)
 {
-	void  *secm_area;
 	int ret;
 
-	secm_area = (void *)get_zeroed_page(GFP_KERNEL |  GFP_DMA);
-	if (!secm_area)
-		return -ENOMEM;
-
-	mutex_lock(&css->mutex);
 	if (enable && !css->cm_enabled) {
 		css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 		css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 		if (!css->cub_addr1 || !css->cub_addr2) {
 			free_page((unsigned long)css->cub_addr1);
 			free_page((unsigned long)css->cub_addr2);
-			free_page((unsigned long)secm_area);
-			mutex_unlock(&css->mutex);
 			return -ENOMEM;
 		}
 	}
-	ret = __chsc_do_secm(css, enable, secm_area);
+	ret = __chsc_do_secm(css, enable);
 	if (!ret) {
 		css->cm_enabled = enable;
 		if (css->cm_enabled) {
 			ret = chsc_add_cmg_attr(css);
 			if (ret) {
-				memset(secm_area, 0, PAGE_SIZE);
-				__chsc_do_secm(css, 0, secm_area);
+				__chsc_do_secm(css, 0);
 				css->cm_enabled = 0;
 			}
 		} else
@@ -787,54 +804,81 @@ chsc_secm(struct channel_subsystem *css, int enable)
 		free_page((unsigned long)css->cub_addr1);
 		free_page((unsigned long)css->cub_addr2);
 	}
-	mutex_unlock(&css->mutex);
-	free_page((unsigned long)secm_area);
 	return ret;
 }
 
-int chsc_determine_channel_path_description(struct chp_id chpid,
-					    struct channel_path_desc *desc)
+int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
+				     int c, int m, void *page)
 {
+	struct chsc_scpd *scpd_area;
 	int ccode, ret;
 
-	struct {
-		struct chsc_header request;
-		u32 : 24;
-		u32 first_chpid : 8;
-		u32 : 24;
-		u32 last_chpid : 8;
-		u32 zeroes1;
-		struct chsc_header response;
-		u32 zeroes2;
-		struct channel_path_desc desc;
-	} __attribute__ ((packed)) *scpd_area;
-
-	scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
-	if (!scpd_area)
-		return -ENOMEM;
+	if ((rfmt == 1) && !css_general_characteristics.fcs)
+		return -EINVAL;
+	if ((rfmt == 2) && !css_general_characteristics.cib)
+		return -EINVAL;
 
+	memset(page, 0, PAGE_SIZE);
+	scpd_area = page;
 	scpd_area->request.length = 0x0010;
 	scpd_area->request.code = 0x0002;
-
+	scpd_area->cssid = chpid.cssid;
 	scpd_area->first_chpid = chpid.id;
 	scpd_area->last_chpid = chpid.id;
+	scpd_area->m = m;
+	scpd_area->c = c;
+	scpd_area->fmt = fmt;
+	scpd_area->rfmt = rfmt;
 
 	ccode = chsc(scpd_area);
-	if (ccode > 0) {
-		ret = (ccode == 3) ? -ENODEV : -EBUSY;
-		goto out;
-	}
+	if (ccode > 0)
+		return (ccode == 3) ? -ENODEV : -EBUSY;
 
 	ret = chsc_error_from_response(scpd_area->response.code);
-	if (ret == 0)
-		/* Success. */
-		memcpy(desc, &scpd_area->desc,
-		       sizeof(struct channel_path_desc));
-	else
+	if (ret)
 		CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
 			      scpd_area->response.code);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
+
+int chsc_determine_base_channel_path_desc(struct chp_id chpid,
+					  struct channel_path_desc *desc)
+{
+	struct chsc_response_struct *chsc_resp;
+	struct chsc_scpd *scpd_area;
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&chsc_page_lock, flags);
+	scpd_area = chsc_page;
+	ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
+	if (ret)
+		goto out;
+	chsc_resp = (void *)&scpd_area->response;
+	memcpy(desc, &chsc_resp->data, sizeof(*desc));
+out:
+	spin_unlock_irqrestore(&chsc_page_lock, flags);
+	return ret;
+}
+
+int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
+					  struct channel_path_desc_fmt1 *desc)
+{
+	struct chsc_response_struct *chsc_resp;
+	struct chsc_scpd *scpd_area;
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&chsc_page_lock, flags);
+	scpd_area = chsc_page;
+	ret = chsc_determine_channel_path_desc(chpid, 0, 0, 1, 0, scpd_area);
+	if (ret)
+		goto out;
+	chsc_resp = (void *)&scpd_area->response;
+	memcpy(desc, &chsc_resp->data, sizeof(*desc));
 out:
-	free_page((unsigned long)scpd_area);
+	spin_unlock_irqrestore(&chsc_page_lock, flags);
 	return ret;
 }
 
@@ -842,33 +886,22 @@ static void
 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
 			  struct cmg_chars *chars)
 {
-	switch (chp->cmg) {
-	case 2:
-	case 3:
-		chp->cmg_chars = kmalloc(sizeof(struct cmg_chars),
-					 GFP_KERNEL);
-		if (chp->cmg_chars) {
-			int i, mask;
-			struct cmg_chars *cmg_chars;
-
-			cmg_chars = chp->cmg_chars;
-			for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
-				mask = 0x80 >> (i + 3);
-				if (cmcv & mask)
-					cmg_chars->values[i] = chars->values[i];
-				else
-					cmg_chars->values[i] = 0;
-			}
-		}
-		break;
-	default:
-		/* No cmg-dependent data. */
-		break;
+	struct cmg_chars *cmg_chars;
+	int i, mask;
+
+	cmg_chars = chp->cmg_chars;
+	for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
+		mask = 0x80 >> (i + 3);
+		if (cmcv & mask)
+			cmg_chars->values[i] = chars->values[i];
+		else
+			cmg_chars->values[i] = 0;
 	}
 }
 
 int chsc_get_channel_measurement_chars(struct channel_path *chp)
 {
+	struct cmg_chars *cmg_chars;
 	int ccode, ret;
 
 	struct {
@@ -892,13 +925,16 @@ int chsc_get_channel_measurement_chars(struct channel_path *chp)
 		u32 data[NR_MEASUREMENT_CHARS];
 	} __attribute__ ((packed)) *scmc_area;
 
-	scmc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
-	if (!scmc_area)
+	chp->cmg_chars = NULL;
+	cmg_chars = kmalloc(sizeof(*cmg_chars), GFP_KERNEL);
+	if (!cmg_chars)
 		return -ENOMEM;
 
+	spin_lock_irq(&chsc_page_lock);
+	memset(chsc_page, 0, PAGE_SIZE);
+	scmc_area = chsc_page;
 	scmc_area->request.length = 0x0010;
 	scmc_area->request.code = 0x0022;
-
 	scmc_area->first_chpid = chp->chpid.id;
 	scmc_area->last_chpid = chp->chpid.id;
 
@@ -909,44 +945,63 @@ int chsc_get_channel_measurement_chars(struct channel_path *chp)
 	}
 
 	ret = chsc_error_from_response(scmc_area->response.code);
-	if (ret == 0) {
-		/* Success. */
-		if (!scmc_area->not_valid) {
-			chp->cmg = scmc_area->cmg;
-			chp->shared = scmc_area->shared;
-			chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
-						  (struct cmg_chars *)
-						  &scmc_area->data);
-		} else {
-			chp->cmg = -1;
-			chp->shared = -1;
-		}
-	} else {
+	if (ret) {
 		CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
 			      scmc_area->response.code);
+		goto out;
+	}
+	if (scmc_area->not_valid) {
+		chp->cmg = -1;
+		chp->shared = -1;
+		goto out;
 	}
+	chp->cmg = scmc_area->cmg;
+	chp->shared = scmc_area->shared;
+	if (chp->cmg != 2 && chp->cmg != 3) {
+		/* No cmg-dependent data. */
+		goto out;
+	}
+	chp->cmg_chars = cmg_chars;
+	chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
+				  (struct cmg_chars *) &scmc_area->data);
 out:
-	free_page((unsigned long)scmc_area);
+	spin_unlock_irq(&chsc_page_lock);
+	if (!chp->cmg_chars)
+		kfree(cmg_chars);
+
 	return ret;
 }
 
-int __init chsc_alloc_sei_area(void)
+int __init chsc_init(void)
 {
+	int ret;
+
 	sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
-	if (!sei_page)
-		CIO_MSG_EVENT(0, "Can't allocate page for processing of "
-			      "chsc machine checks!\n");
-	return (sei_page ? 0 : -ENOMEM);
+	chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
+	if (!sei_page || !chsc_page) {
+		ret = -ENOMEM;
+		goto out_err;
+	}
+	ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
+	if (ret)
+		goto out_err;
+	return ret;
+out_err:
+	free_page((unsigned long)chsc_page);
+	free_page((unsigned long)sei_page);
+	return ret;
 }
 
-void __init chsc_free_sei_area(void)
+void __init chsc_init_cleanup(void)
 {
-	kfree(sei_page);
+	crw_unregister_handler(CRW_RSC_CSS);
+	free_page((unsigned long)chsc_page);
+	free_page((unsigned long)sei_page);
 }
 
-int __init
-chsc_enable_facility(int operation_code)
+int chsc_enable_facility(int operation_code)
 {
+	unsigned long flags;
 	int ret;
 	struct {
 		struct chsc_header request;
@@ -963,9 +1018,9 @@ chsc_enable_facility(int operation_code)
 		u32 reserved6:24;
 	} __attribute__ ((packed)) *sda_area;
 
-	sda_area = (void *)get_zeroed_page(GFP_KERNEL|GFP_DMA);
-	if (!sda_area)
-		return -ENOMEM;
+	spin_lock_irqsave(&chsc_page_lock, flags);
+	memset(chsc_page, 0, PAGE_SIZE);
+	sda_area = chsc_page;
 	sda_area->request.length = 0x0400;
 	sda_area->request.code = 0x0031;
 	sda_area->operation_code = operation_code;
@@ -986,8 +1041,8 @@ chsc_enable_facility(int operation_code)
 	if (ret != 0)
 		CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
 			      operation_code, sda_area->response.code);
- out:
-	free_page((unsigned long)sda_area);
+out:
+	spin_unlock_irqrestore(&chsc_page_lock, flags);
 	return ret;
 }
 
@@ -1006,13 +1061,12 @@ chsc_determine_css_characteristics(void)
 		struct chsc_header response;
 		u32 reserved4;
 		u32 general_char[510];
-		u32 chsc_char[518];
+		u32 chsc_char[508];
 	} __attribute__ ((packed)) *scsc_area;
 
-	scsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
-	if (!scsc_area)
-		return -ENOMEM;
-
+	spin_lock_irq(&chsc_page_lock);
+	memset(chsc_page, 0, PAGE_SIZE);
+	scsc_area = chsc_page;
 	scsc_area->request.length = 0x0010;
 	scsc_area->request.code = 0x0010;
 
@@ -1032,9 +1086,165 @@ chsc_determine_css_characteristics(void)
 		CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
 			      scsc_area->response.code);
 exit:
-	free_page ((unsigned long) scsc_area);
+	spin_unlock_irq(&chsc_page_lock);
 	return result;
 }
 
 EXPORT_SYMBOL_GPL(css_general_characteristics);
 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
+
+int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
+{
+	struct {
+		struct chsc_header request;
+		unsigned int rsvd0;
+		unsigned int op : 8;
+		unsigned int rsvd1 : 8;
+		unsigned int ctrl : 16;
+		unsigned int rsvd2[5];
+		struct chsc_header response;
+		unsigned int rsvd3[7];
+	} __attribute__ ((packed)) *rr;
+	int rc;
+
+	memset(page, 0, PAGE_SIZE);
+	rr = page;
+	rr->request.length = 0x0020;
+	rr->request.code = 0x0033;
+	rr->op = op;
+	rr->ctrl = ctrl;
+	rc = chsc(rr);
+	if (rc)
+		return -EIO;
+	rc = (rr->response.code == 0x0001) ? 0 : -EIO;
+	return rc;
+}
+
+int chsc_sstpi(void *page, void *result, size_t size)
+{
+	struct {
+		struct chsc_header request;
+		unsigned int rsvd0[3];
+		struct chsc_header response;
+		char data[size];
+	} __attribute__ ((packed)) *rr;
+	int rc;
+
+	memset(page, 0, PAGE_SIZE);
+	rr = page;
+	rr->request.length = 0x0010;
+	rr->request.code = 0x0038;
+	rc = chsc(rr);
+	if (rc)
+		return -EIO;
+	memcpy(result, &rr->data, size);
+	return (rr->response.code == 0x0001) ? 0 : -EIO;
+}
+
+int chsc_siosl(struct subchannel_id schid)
+{
+	struct {
+		struct chsc_header request;
+		u32 word1;
+		struct subchannel_id sid;
+		u32 word3;
+		struct chsc_header response;
+		u32 word[11];
+	} __attribute__ ((packed)) *siosl_area;
+	unsigned long flags;
+	int ccode;
+	int rc;
+
+	spin_lock_irqsave(&chsc_page_lock, flags);
+	memset(chsc_page, 0, PAGE_SIZE);
+	siosl_area = chsc_page;
+	siosl_area->request.length = 0x0010;
+	siosl_area->request.code = 0x0046;
+	siosl_area->word1 = 0x80000000;
+	siosl_area->sid = schid;
+
+	ccode = chsc(siosl_area);
+	if (ccode > 0) {
+		if (ccode == 3)
+			rc = -ENODEV;
+		else
+			rc = -EBUSY;
+		CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
+			      schid.ssid, schid.sch_no, ccode);
+		goto out;
+	}
+	rc = chsc_error_from_response(siosl_area->response.code);
+	if (rc)
+		CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
+			      schid.ssid, schid.sch_no,
+			      siosl_area->response.code);
+	else
+		CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
+			      schid.ssid, schid.sch_no);
+out:
+	spin_unlock_irqrestore(&chsc_page_lock, flags);
+	return rc;
+}
+EXPORT_SYMBOL_GPL(chsc_siosl);
+
+/**
+ * chsc_scm_info() - store SCM information (SSI)
+ * @scm_area: request and response block for SSI
+ * @token: continuation token
+ *
+ * Returns 0 on success.
+ */
+int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
+{
+	int ccode, ret;
+
+	memset(scm_area, 0, sizeof(*scm_area));
+	scm_area->request.length = 0x0020;
+	scm_area->request.code = 0x004C;
+	scm_area->reqtok = token;
+
+	ccode = chsc(scm_area);
+	if (ccode > 0) {
+		ret = (ccode == 3) ? -ENODEV : -EBUSY;
+		goto out;
+	}
+	ret = chsc_error_from_response(scm_area->response.code);
+	if (ret != 0)
+		CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
+			      scm_area->response.code);
+out:
+	return ret;
+}
+EXPORT_SYMBOL_GPL(chsc_scm_info);
+
+/**
+ * chsc_pnso_brinfo() - Perform Network-Subchannel Operation, Bridge Info.
+ * @schid:		id of the subchannel on which PNSO is performed
+ * @brinfo_area:	request and response block for the operation
+ * @resume_token:	resume token for multiblock response
+ * @cnc:		Boolean change-notification control
+ *
+ * brinfo_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL)
+ *
+ * Returns 0 on success.
+ */
+int chsc_pnso_brinfo(struct subchannel_id schid,
+		struct chsc_pnso_area *brinfo_area,
+		struct chsc_brinfo_resume_token resume_token,
+		int cnc)
+{
+	memset(brinfo_area, 0, sizeof(*brinfo_area));
+	brinfo_area->request.length = 0x0030;
+	brinfo_area->request.code = 0x003d; /* network-subchannel operation */
+	brinfo_area->m	   = schid.m;
+	brinfo_area->ssid  = schid.ssid;
+	brinfo_area->sch   = schid.sch_no;
+	brinfo_area->cssid = schid.cssid;
+	brinfo_area->oc    = 0; /* Store-network-bridging-information list */
+	brinfo_area->resume_token = resume_token;
+	brinfo_area->n	   = (cnc != 0);
+	if (chsc(brinfo_area))
+		return -EIO;
+	return chsc_error_from_response(brinfo_area->response.code);
+}
+EXPORT_SYMBOL_GPL(chsc_pnso_brinfo);