Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1555 insertions, 0 deletions

diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
new file mode 100644
index 0000000000..0abd77f4b6
--- /dev/null
+++ b/drivers/s390/cio/chsc.c
@@ -0,0 +1,1555 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *   S/390 common I/O routines -- channel subsystem call
+ *
+ *    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/mutex.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 <asm/ebcdic.h>
+#include <asm/ap.h>
+
+#include "css.h"
+#include "cio.h"
+#include "cio_debug.h"
+#include "ioasm.h"
+#include "chp.h"
+#include "chsc.h"
+
+static void *sei_page;
+static void *chsc_page;
+static DEFINE_SPINLOCK(chsc_page_lock);
+
+#define SEI_VF_FLA	0xc0 /* VF flag for Full Link Address */
+#define SEI_RS_CHPID	0x4  /* 4 in RS field indicates CHPID */
+
+/**
+ * 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:
+		return 0;
+	case 0x0002:
+	case 0x0003:
+	case 0x0006:
+	case 0x0007:
+	case 0x0008:
+	case 0x000a:
+	case 0x0104:
+		return -EINVAL;
+	case 0x0004:
+	case 0x0106:		/* "Wrong Channel Parm" for the op 0x003d */
+		return -EOPNOTSUPP;
+	case 0x000b:
+	case 0x0107:		/* "Channel busy" for the op 0x003d */
+		return -EBUSY;
+	case 0x0100:
+	case 0x0102:
+		return -ENOMEM;
+	case 0x0108:		/* "HW limit exceeded" for the op 0x003d */
+		return -EUSERS;
+	default:
+		return -EIO;
+	}
+}
+EXPORT_SYMBOL_GPL(chsc_error_from_response);
+
+struct chsc_ssd_area {
+	struct chsc_header request;
+	u16 :10;
+	u16 ssid:2;
+	u16 :4;
+	u16 f_sch;	  /* first subchannel */
+	u16 :16;
+	u16 l_sch;	  /* last subchannel */
+	u32 :32;
+	struct chsc_header response;
+	u32 :32;
+	u8 sch_valid : 1;
+	u8 dev_valid : 1;
+	u8 st	     : 3; /* subchannel type */
+	u8 zeroes    : 3;
+	u8  unit_addr;	  /* unit address */
+	u16 devno;	  /* device number */
+	u8 path_mask;
+	u8 fla_valid_mask;
+	u16 sch;	  /* subchannel */
+	u8 chpid[8];	  /* chpids 0-7 */
+	u16 fla[8];	  /* full link addresses 0-7 */
+} __packed __aligned(PAGE_SIZE);
+
+int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
+{
+	struct chsc_ssd_area *ssd_area;
+	unsigned long flags;
+	int ccode;
+	int ret;
+	int i;
+	int mask;
+
+	spin_lock_irqsave(&chsc_page_lock, flags);
+	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;
+	ssd_area->f_sch = schid.sch_no;
+	ssd_area->l_sch = schid.sch_no;
+
+	ccode = chsc(ssd_area);
+	/* Check response. */
+	if (ccode > 0) {
+		ret = (ccode == 3) ? -ENODEV : -EBUSY;
+		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;
+	}
+	if (!ssd_area->sch_valid) {
+		ret = -ENODEV;
+		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;
+	ssd->path_mask = ssd_area->path_mask;
+	ssd->fla_valid_mask = ssd_area->fla_valid_mask;
+	for (i = 0; i < 8; i++) {
+		mask = 0x80 >> i;
+		if (ssd_area->path_mask & mask) {
+			chp_id_init(&ssd->chpid[i]);
+			ssd->chpid[i].id = ssd_area->chpid[i];
+		}
+		if (ssd_area->fla_valid_mask & mask)
+			ssd->fla[i] = ssd_area->fla[i];
+	}
+out:
+	spin_unlock_irqrestore(&chsc_page_lock, flags);
+	return ret;
+}
+
+/**
+ * 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)
+{
+	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;
+
+	return chsc_error_from_response(ssqd->response.code);
+}
+EXPORT_SYMBOL_GPL(chsc_ssqd);
+
+/**
+ * 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
+ * @isc: Interruption Subclass for this subchannel
+ *
+ * Returns 0 on success.
+ */
+int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc,
+	      u64 summary_indicator_addr, u64 subchannel_indicator_addr, u8 isc)
+{
+	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 = 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)
+{
+	spin_lock_irq(sch->lock);
+	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;
+
+out_unreg:
+	sch->lpm = 0;
+	spin_unlock_irq(sch->lock);
+	css_schedule_eval(sch->schid);
+	return 0;
+}
+
+void chsc_chp_offline(struct chp_id chpid)
+{
+	struct channel_path *chp = chpid_to_chp(chpid);
+	struct chp_link link;
+	char dbf_txt[15];
+
+	sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
+	CIO_TRACE_EVENT(2, dbf_txt);
+
+	if (chp_get_status(chpid) <= 0)
+		return;
+	memset(&link, 0, sizeof(struct chp_link));
+	link.chpid = chpid;
+	/* Wait until previous actions have settled. */
+	css_wait_for_slow_path();
+
+	mutex_lock(&chp->lock);
+	chp_update_desc(chp);
+	mutex_unlock(&chp->lock);
+
+	for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
+}
+
+static int __s390_process_res_acc(struct subchannel *sch, void *data)
+{
+	spin_lock_irq(sch->lock);
+	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 chp_link *link)
+{
+	char dbf_txt[15];
+
+	sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
+		link->chpid.id);
+	CIO_TRACE_EVENT( 2, dbf_txt);
+	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
+	 * do a validation on those.
+	 * The more information we have (info), the less scanning
+	 * will we have to do.
+	 */
+	for_each_subchannel_staged(__s390_process_res_acc, NULL, link);
+	css_schedule_reprobe();
+}
+
+static int process_fces_event(struct subchannel *sch, void *data)
+{
+	spin_lock_irq(sch->lock);
+	if (sch->driver && sch->driver->chp_event)
+		sch->driver->chp_event(sch, data, CHP_FCES_EVENT);
+	spin_unlock_irq(sch->lock);
+	return 0;
+}
+
+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;
+	/* ccdf has to be big enough for a link-incident record */
+	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 __aligned(PAGE_SIZE);
+
+/*
+ * Link Incident Record as defined in SA22-7202, "ESCON I/O Interface"
+ */
+
+#define LIR_IQ_CLASS_INFO		0
+#define LIR_IQ_CLASS_DEGRADED		1
+#define LIR_IQ_CLASS_NOT_OPERATIONAL	2
+
+struct lir {
+	struct {
+		u32 null:1;
+		u32 reserved:3;
+		u32 class:2;
+		u32 reserved2:2;
+	} __packed iq;
+	u32 ic:8;
+	u32 reserved:16;
+	struct node_descriptor incident_node;
+	struct node_descriptor attached_node;
+	u8 reserved2[32];
+} __packed;
+
+#define PARAMS_LEN	10	/* PARAMS=xx,xxxxxx */
+#define NODEID_LEN	35	/* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
+
+/* Copy EBCIDC text, convert to ASCII and optionally add delimiter. */
+static char *store_ebcdic(char *dest, const char *src, unsigned long len,
+			  char delim)
+{
+	memcpy(dest, src, len);
+	EBCASC(dest, len);
+
+	if (delim)
+		dest[len++] = delim;
+
+	return dest + len;
+}
+
+static void chsc_link_from_sei(struct chp_link *link,
+				struct chsc_sei_nt0_area *sei_area)
+{
+	if ((sei_area->vf & SEI_VF_FLA) != 0) {
+		link->fla	= sei_area->fla;
+		link->fla_mask	= ((sei_area->vf & SEI_VF_FLA) == SEI_VF_FLA) ?
+							0xffff : 0xff00;
+	}
+}
+
+/* Format node ID and parameters for output in LIR log message. */
+static void format_node_data(char *params, char *id, struct node_descriptor *nd)
+{
+	memset(params, 0, PARAMS_LEN);
+	memset(id, 0, NODEID_LEN);
+
+	if (nd->validity != ND_VALIDITY_VALID) {
+		strncpy(params, "n/a", PARAMS_LEN - 1);
+		strncpy(id, "n/a", NODEID_LEN - 1);
+		return;
+	}
+
+	/* PARAMS=xx,xxxxxx */
+	snprintf(params, PARAMS_LEN, "%02x,%06x", nd->byte0, nd->params);
+	/* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
+	id = store_ebcdic(id, nd->type, sizeof(nd->type), '/');
+	id = store_ebcdic(id, nd->model, sizeof(nd->model), ',');
+	id = store_ebcdic(id, nd->manufacturer, sizeof(nd->manufacturer), '.');
+	id = store_ebcdic(id, nd->plant, sizeof(nd->plant), 0);
+	id = store_ebcdic(id, nd->seq, sizeof(nd->seq), ',');
+	sprintf(id, "%04X", nd->tag);
+}
+
+static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
+{
+	struct lir *lir = (struct lir *) &sei_area->ccdf;
+	char iuparams[PARAMS_LEN], iunodeid[NODEID_LEN], auparams[PARAMS_LEN],
+	     aunodeid[NODEID_LEN];
+
+	CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x, iq=%02x)\n",
+		      sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
+
+	/* Ignore NULL Link Incident Records. */
+	if (lir->iq.null)
+		return;
+
+	/* Inform user that a link requires maintenance actions because it has
+	 * become degraded or not operational. Note that this log message is
+	 * the primary intention behind a Link Incident Record. */
+
+	format_node_data(iuparams, iunodeid, &lir->incident_node);
+	format_node_data(auparams, aunodeid, &lir->attached_node);
+
+	switch (lir->iq.class) {
+	case LIR_IQ_CLASS_DEGRADED:
+		pr_warn("Link degraded: RS=%02x RSID=%04x IC=%02x "
+			"IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
+			sei_area->rs, sei_area->rsid, lir->ic, iuparams,
+			iunodeid, auparams, aunodeid);
+		break;
+	case LIR_IQ_CLASS_NOT_OPERATIONAL:
+		pr_err("Link stopped: RS=%02x RSID=%04x IC=%02x "
+		       "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
+		       sei_area->rs, sei_area->rsid, lir->ic, iuparams,
+		       iunodeid, auparams, aunodeid);
+		break;
+	default:
+		break;
+	}
+}
+
+static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
+{
+	struct channel_path *chp;
+	struct chp_link link;
+	struct chp_id chpid;
+	int status;
+
+	CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
+		      "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
+	if (sei_area->rs != 4)
+		return;
+	chp_id_init(&chpid);
+	chpid.id = sei_area->rsid;
+	/* allocate a new channel path structure, if needed */
+	status = chp_get_status(chpid);
+	if (!status)
+		return;
+
+	if (status < 0) {
+		chp_new(chpid);
+	} else {
+		chp = chpid_to_chp(chpid);
+		mutex_lock(&chp->lock);
+		chp_update_desc(chp);
+		mutex_unlock(&chp->lock);
+	}
+	memset(&link, 0, sizeof(struct chp_link));
+	link.chpid = chpid;
+	chsc_link_from_sei(&link, sei_area);
+	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);
+	}
+}
+
+struct chp_config_data {
+	u8 map[32];
+	u8 op;
+	u8 pc;
+};
+
+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)
+		return;
+	data = (struct chp_config_data *) &(sei_area->ccdf);
+	chp_id_init(&chpid);
+	for (num = 0; num <= __MAX_CHPID; num++) {
+		if (!chp_test_bit(data->map, num))
+			continue;
+		chpid.id = num;
+		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);
+			break;
+		case 1:
+			chp_cfg_schedule(chpid, 0);
+			break;
+		case 2:
+			chp_cfg_cancel_deconfigure(chpid);
+			break;
+		}
+	}
+}
+
+static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
+{
+	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_ap_cfg_chg(struct chsc_sei_nt0_area *sei_area)
+{
+	CIO_CRW_EVENT(3, "chsc: ap config changed\n");
+	if (sei_area->rs != 5)
+		return;
+
+	ap_bus_cfg_chg();
+}
+
+static void chsc_process_sei_fces_event(struct chsc_sei_nt0_area *sei_area)
+{
+	struct chp_link link;
+	struct chp_id chpid;
+	struct channel_path *chp;
+
+	CIO_CRW_EVENT(4,
+	"chsc: FCES status notification (rs=%02x, rs_id=%04x, FCES-status=%x)\n",
+		sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
+
+	if (sei_area->rs != SEI_RS_CHPID)
+		return;
+	chp_id_init(&chpid);
+	chpid.id = sei_area->rsid;
+
+	/* Ignore the event on unknown/invalid chp */
+	chp = chpid_to_chp(chpid);
+	if (!chp)
+		return;
+
+	memset(&link, 0, sizeof(struct chp_link));
+	link.chpid = chpid;
+	chsc_link_from_sei(&link, sei_area);
+
+	for_each_subchannel_staged(process_fces_event, NULL, &link);
+}
+
+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 accessibility */
+		chsc_process_sei_res_acc(sei_area);
+		break;
+	case 3: /* ap config changed */
+		chsc_process_sei_ap_cfg_chg(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;
+	case 15: /* FCES event notification */
+		chsc_process_sei_fces_event(sei_area);
+		break;
+	default: /* other stuff */
+		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();
+	}
+}
+
+static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
+{
+	static int ntsm_unsupported;
+
+	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->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;
+		}
+
+		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;
+		}
+
+		if (!(sei->u.nt0_area.flags & 0x80))
+			break;
+	}
+}
+
+/*
+ * 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)
+{
+	struct chsc_sei *sei = sei_page;
+
+	if (overflow) {
+		css_schedule_eval_all();
+		return;
+	}
+	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);
+
+	CIO_TRACE_EVENT(2, "prcss");
+	chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
+}
+
+void chsc_chp_online(struct chp_id chpid)
+{
+	struct channel_path *chp = chpid_to_chp(chpid);
+	struct chp_link link;
+	char dbf_txt[15];
+
+	sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
+	CIO_TRACE_EVENT(2, dbf_txt);
+
+	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();
+
+		mutex_lock(&chp->lock);
+		chp_update_desc(chp);
+		mutex_unlock(&chp->lock);
+
+		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)
+{
+	unsigned long flags;
+	struct chp_link link;
+
+	memset(&link, 0, sizeof(struct chp_link));
+	link.chpid = chpid;
+	spin_lock_irqsave(sch->lock, flags);
+	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);
+}
+
+static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
+{
+	struct chp_id *chpid = data;
+
+	__s390_subchannel_vary_chpid(sch, *chpid, 0);
+	return 0;
+}
+
+static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
+{
+	struct chp_id *chpid = data;
+
+	__s390_subchannel_vary_chpid(sch, *chpid, 1);
+	return 0;
+}
+
+/**
+ * chsc_chp_vary - propagate channel-path vary operation to subchannels
+ * @chpid: channl-path ID
+ * @on: non-zero for vary online, zero for vary offline
+ */
+int chsc_chp_vary(struct chp_id chpid, int on)
+{
+	struct channel_path *chp = chpid_to_chp(chpid);
+
+	/*
+	 * Redo PathVerification on the devices the chpid connects to
+	 */
+	if (on) {
+		/* Try to update the channel path description. */
+		chp_update_desc(chp);
+		for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
+					   NULL, &chpid);
+		css_schedule_reprobe();
+	} else
+		for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
+					   NULL, &chpid);
+
+	return 0;
+}
+
+static void
+chsc_remove_cmg_attr(struct channel_subsystem *css)
+{
+	int i;
+
+	for (i = 0; i <= __MAX_CHPID; i++) {
+		if (!css->chps[i])
+			continue;
+		chp_remove_cmg_attr(css->chps[i]);
+	}
+}
+
+static int
+chsc_add_cmg_attr(struct channel_subsystem *css)
+{
+	int i, ret;
+
+	ret = 0;
+	for (i = 0; i <= __MAX_CHPID; i++) {
+		if (!css->chps[i])
+			continue;
+		ret = chp_add_cmg_attr(css->chps[i]);
+		if (ret)
+			goto cleanup;
+	}
+	return ret;
+cleanup:
+	for (--i; i >= 0; i--) {
+		if (!css->chps[i])
+			continue;
+		chp_remove_cmg_attr(css->chps[i]);
+	}
+	return ret;
+}
+
+int __chsc_do_secm(struct channel_subsystem *css, int enable)
+{
+	struct {
+		struct chsc_header request;
+		u32 operation_code : 2;
+		u32 : 30;
+		u32 key : 4;
+		u32 : 28;
+		u32 zeroes1;
+		u32 cub_addr1;
+		u32 zeroes2;
+		u32 cub_addr2;
+		u32 reserved[13];
+		struct chsc_header response;
+		u32 status : 8;
+		u32 : 4;
+		u32 fmt : 4;
+		u32 : 16;
+	} *secm_area;
+	unsigned long flags;
+	int ret, ccode;
+
+	spin_lock_irqsave(&chsc_page_lock, flags);
+	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 >> 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) {
+		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_irqrestore(&chsc_page_lock, flags);
+	return ret;
+}
+
+int
+chsc_secm(struct channel_subsystem *css, int enable)
+{
+	int ret;
+
+	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);
+			return -ENOMEM;
+		}
+	}
+	ret = __chsc_do_secm(css, enable);
+	if (!ret) {
+		css->cm_enabled = enable;
+		if (css->cm_enabled) {
+			ret = chsc_add_cmg_attr(css);
+			if (ret) {
+				__chsc_do_secm(css, 0);
+				css->cm_enabled = 0;
+			}
+		} else
+			chsc_remove_cmg_attr(css);
+	}
+	if (!css->cm_enabled) {
+		free_page((unsigned long)css->cub_addr1);
+		free_page((unsigned long)css->cub_addr2);
+	}
+	return ret;
+}
+
+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;
+
+	if ((rfmt == 1 || rfmt == 0) && c == 1 &&
+	    !css_general_characteristics.fcs)
+		return -EINVAL;
+	if ((rfmt == 2) && !css_general_characteristics.cib)
+		return -EINVAL;
+	if ((rfmt == 3) && !css_general_characteristics.util_str)
+		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)
+		return (ccode == 3) ? -ENODEV : -EBUSY;
+
+	ret = chsc_error_from_response(scpd_area->response.code);
+	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);
+
+#define chsc_det_chp_desc(FMT, c)					\
+int chsc_determine_fmt##FMT##_channel_path_desc(			\
+	struct chp_id chpid, struct channel_path_desc_fmt##FMT *desc)	\
+{									\
+	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, FMT, c, 0,	\
+					       scpd_area);		\
+	if (ret)							\
+		goto out;						\
+									\
+	memcpy(desc, scpd_area->data, sizeof(*desc));			\
+out:									\
+	spin_unlock_irqrestore(&chsc_page_lock, flags);			\
+	return ret;							\
+}
+
+chsc_det_chp_desc(0, 0)
+chsc_det_chp_desc(1, 1)
+chsc_det_chp_desc(3, 0)
+
+static void
+chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
+			  struct cmg_chars *chars)
+{
+	int i, mask;
+
+	for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
+		mask = 0x80 >> (i + 3);
+		if (cmcv & mask)
+			chp->cmg_chars.values[i] = chars->values[i];
+		else
+			chp->cmg_chars.values[i] = 0;
+	}
+}
+
+int chsc_get_channel_measurement_chars(struct channel_path *chp)
+{
+	unsigned long flags;
+	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;
+		u32 not_valid : 1;
+		u32 shared : 1;
+		u32 : 22;
+		u32 chpid : 8;
+		u32 cmcv : 5;
+		u32 : 11;
+		u32 cmgq : 8;
+		u32 cmg : 8;
+		u32 zeroes3;
+		u32 data[NR_MEASUREMENT_CHARS];
+	} *scmc_area;
+
+	chp->shared = -1;
+	chp->cmg = -1;
+
+	if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm)
+		return -EINVAL;
+
+	spin_lock_irqsave(&chsc_page_lock, flags);
+	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;
+
+	ccode = chsc(scmc_area);
+	if (ccode > 0) {
+		ret = (ccode == 3) ? -ENODEV : -EBUSY;
+		goto out;
+	}
+
+	ret = chsc_error_from_response(scmc_area->response.code);
+	if (ret) {
+		CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
+			      scmc_area->response.code);
+		goto out;
+	}
+	if (scmc_area->not_valid)
+		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;
+	}
+	chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
+				  (struct cmg_chars *) &scmc_area->data);
+out:
+	spin_unlock_irqrestore(&chsc_page_lock, flags);
+	return ret;
+}
+
+int __init chsc_init(void)
+{
+	int ret;
+
+	sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
+	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_init_cleanup(void)
+{
+	crw_unregister_handler(CRW_RSC_CSS);
+	free_page((unsigned long)chsc_page);
+	free_page((unsigned long)sei_page);
+}
+
+int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code)
+{
+	int ret;
+
+	sda_area->request.length = 0x0400;
+	sda_area->request.code = 0x0031;
+	sda_area->operation_code = operation_code;
+
+	ret = chsc(sda_area);
+	if (ret > 0) {
+		ret = (ret == 3) ? -ENODEV : -EBUSY;
+		goto out;
+	}
+
+	switch (sda_area->response.code) {
+	case 0x0101:
+		ret = -EOPNOTSUPP;
+		break;
+	default:
+		ret = chsc_error_from_response(sda_area->response.code);
+	}
+out:
+	return ret;
+}
+
+int chsc_enable_facility(int operation_code)
+{
+	struct chsc_sda_area *sda_area;
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&chsc_page_lock, flags);
+	memset(chsc_page, 0, PAGE_SIZE);
+	sda_area = chsc_page;
+
+	ret = __chsc_enable_facility(sda_area, operation_code);
+	if (ret != 0)
+		CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
+			      operation_code, sda_area->response.code);
+
+	spin_unlock_irqrestore(&chsc_page_lock, flags);
+	return ret;
+}
+
+int __init chsc_get_cssid_iid(int idx, u8 *cssid, u8 *iid)
+{
+	struct {
+		struct chsc_header request;
+		u8 atype;
+		u32 : 24;
+		u32 reserved1[6];
+		struct chsc_header response;
+		u32 reserved2[3];
+		struct {
+			u8 cssid;
+			u8 iid;
+			u32 : 16;
+		} list[];
+	} *sdcal_area;
+	int ret;
+
+	spin_lock_irq(&chsc_page_lock);
+	memset(chsc_page, 0, PAGE_SIZE);
+	sdcal_area = chsc_page;
+	sdcal_area->request.length = 0x0020;
+	sdcal_area->request.code = 0x0034;
+	sdcal_area->atype = 4;
+
+	ret = chsc(sdcal_area);
+	if (ret) {
+		ret = (ret == 3) ? -ENODEV : -EBUSY;
+		goto exit;
+	}
+
+	ret = chsc_error_from_response(sdcal_area->response.code);
+	if (ret) {
+		CIO_CRW_EVENT(2, "chsc: sdcal failed (rc=%04x)\n",
+			      sdcal_area->response.code);
+		goto exit;
+	}
+
+	if ((addr_t) &sdcal_area->list[idx] <
+	    (addr_t) &sdcal_area->response + sdcal_area->response.length) {
+		*cssid = sdcal_area->list[idx].cssid;
+		*iid = sdcal_area->list[idx].iid;
+	}
+	else
+		ret = -ENODEV;
+exit:
+	spin_unlock_irq(&chsc_page_lock);
+	return ret;
+}
+
+struct css_general_char css_general_characteristics;
+struct css_chsc_char css_chsc_characteristics;
+
+int __init
+chsc_determine_css_characteristics(void)
+{
+	unsigned long flags;
+	int result;
+	struct {
+		struct chsc_header request;
+		u32 reserved1;
+		u32 reserved2;
+		u32 reserved3;
+		struct chsc_header response;
+		u32 reserved4;
+		u32 general_char[510];
+		u32 chsc_char[508];
+	} *scsc_area;
+
+	spin_lock_irqsave(&chsc_page_lock, flags);
+	memset(chsc_page, 0, PAGE_SIZE);
+	scsc_area = chsc_page;
+	scsc_area->request.length = 0x0010;
+	scsc_area->request.code = 0x0010;
+
+	result = chsc(scsc_area);
+	if (result) {
+		result = (result == 3) ? -ENODEV : -EBUSY;
+		goto exit;
+	}
+
+	result = chsc_error_from_response(scsc_area->response.code);
+	if (result == 0) {
+		memcpy(&css_general_characteristics, scsc_area->general_char,
+		       sizeof(css_general_characteristics));
+		memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
+		       sizeof(css_chsc_characteristics));
+	} else
+		CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
+			      scsc_area->response.code);
+exit:
+	spin_unlock_irqrestore(&chsc_page_lock, flags);
+	return result;
+}
+
+EXPORT_SYMBOL_GPL(css_general_characteristics);
+EXPORT_SYMBOL_GPL(css_chsc_characteristics);
+
+int chsc_sstpc(void *page, unsigned int op, u16 ctrl, long *clock_delta)
+{
+	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[3];
+		s64 clock_delta;
+		unsigned int rsvd4[2];
+	} *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;
+	if (clock_delta)
+		*clock_delta = rr->clock_delta;
+	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[];
+	} *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_stzi(void *page, void *result, size_t size)
+{
+	struct {
+		struct chsc_header request;
+		unsigned int rsvd0[3];
+		struct chsc_header response;
+		char data[];
+	} *rr;
+	int rc;
+
+	memset(page, 0, PAGE_SIZE);
+	rr = page;
+	rr->request.length = 0x0010;
+	rr->request.code = 0x003e;
+	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];
+	} *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() - Perform Network-Subchannel Operation
+ * @schid:		id of the subchannel on which PNSO is performed
+ * @pnso_area:		request and response block for the operation
+ * @oc:			Operation Code
+ * @resume_token:	resume token for multiblock response
+ * @cnc:		Boolean change-notification control
+ *
+ * pnso_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL)
+ *
+ * Returns 0 on success.
+ */
+int chsc_pnso(struct subchannel_id schid, struct chsc_pnso_area *pnso_area,
+	      u8 oc, struct chsc_pnso_resume_token resume_token, int cnc)
+{
+	memset(pnso_area, 0, sizeof(*pnso_area));
+	pnso_area->request.length = 0x0030;
+	pnso_area->request.code = 0x003d; /* network-subchannel operation */
+	pnso_area->m	   = schid.m;
+	pnso_area->ssid  = schid.ssid;
+	pnso_area->sch	 = schid.sch_no;
+	pnso_area->cssid = schid.cssid;
+	pnso_area->oc	 = oc;
+	pnso_area->resume_token = resume_token;
+	pnso_area->n	   = (cnc != 0);
+	if (chsc(pnso_area))
+		return -EIO;
+	return chsc_error_from_response(pnso_area->response.code);
+}
+
+int chsc_sgib(u32 origin)
+{
+	struct {
+		struct chsc_header request;
+		u16 op;
+		u8  reserved01[2];
+		u8  reserved02:4;
+		u8  fmt:4;
+		u8  reserved03[7];
+		/* operation data area begin */
+		u8  reserved04[4];
+		u32 gib_origin;
+		u8  reserved05[10];
+		u8  aix;
+		u8  reserved06[4029];
+		struct chsc_header response;
+		u8  reserved07[4];
+	} *sgib_area;
+	int ret;
+
+	spin_lock_irq(&chsc_page_lock);
+	memset(chsc_page, 0, PAGE_SIZE);
+	sgib_area = chsc_page;
+	sgib_area->request.length = 0x0fe0;
+	sgib_area->request.code = 0x0021;
+	sgib_area->op = 0x1;
+	sgib_area->gib_origin = origin;
+
+	ret = chsc(sgib_area);
+	if (ret == 0)
+		ret = chsc_error_from_response(sgib_area->response.code);
+	spin_unlock_irq(&chsc_page_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(chsc_sgib);
+
+#define SCUD_REQ_LEN	0x10 /* SCUD request block length */
+#define SCUD_REQ_CMD	0x4b /* SCUD Command Code */
+
+struct chse_cudb {
+	u16 flags:8;
+	u16 chp_valid:8;
+	u16 cu;
+	u32 esm_valid:8;
+	u32:24;
+	u8 chpid[8];
+	u32:32;
+	u32:32;
+	u8 esm[8];
+	u32 efla[8];
+} __packed;
+
+struct chsc_scud {
+	struct chsc_header request;
+	u16:4;
+	u16 fmt:4;
+	u16 cssid:8;
+	u16 first_cu;
+	u16:16;
+	u16 last_cu;
+	u32:32;
+	struct chsc_header response;
+	u16:4;
+	u16 fmt_resp:4;
+	u32:24;
+	struct chse_cudb cudb[];
+} __packed;
+
+/**
+ * chsc_scud() - Store control-unit description.
+ * @cu:		number of the control-unit
+ * @esm:	8 1-byte endpoint security mode values
+ * @esm_valid:	validity mask for @esm
+ *
+ * Interface to retrieve information about the endpoint security
+ * modes for up to 8 paths of a control unit.
+ *
+ * Returns 0 on success.
+ */
+int chsc_scud(u16 cu, u64 *esm, u8 *esm_valid)
+{
+	struct chsc_scud *scud = chsc_page;
+	int ret;
+
+	spin_lock_irq(&chsc_page_lock);
+	memset(chsc_page, 0, PAGE_SIZE);
+	scud->request.length = SCUD_REQ_LEN;
+	scud->request.code = SCUD_REQ_CMD;
+	scud->fmt = 0;
+	scud->cssid = 0;
+	scud->first_cu = cu;
+	scud->last_cu = cu;
+
+	ret = chsc(scud);
+	if (!ret)
+		ret = chsc_error_from_response(scud->response.code);
+
+	if (!ret && (scud->response.length <= 8 || scud->fmt_resp != 0
+			|| !(scud->cudb[0].flags & 0x80)
+			|| scud->cudb[0].cu != cu)) {
+
+		CIO_MSG_EVENT(2, "chsc: scud failed rc=%04x, L2=%04x "
+			"FMT=%04x, cudb.flags=%02x, cudb.cu=%04x",
+			scud->response.code, scud->response.length,
+			scud->fmt_resp, scud->cudb[0].flags, scud->cudb[0].cu);
+		ret = -EINVAL;
+	}
+
+	if (ret)
+		goto out;
+
+	memcpy(esm, scud->cudb[0].esm, sizeof(*esm));
+	*esm_valid = scud->cudb[0].esm_valid;
+out:
+	spin_unlock_irq(&chsc_page_lock);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(chsc_scud);