1 files changed, 267 insertions, 757 deletions

diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
index 6f05a44..ea92ac4 100644
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -15,202 +15,124 @@
 #include <linux/device.h>
 
 #include <asm/cio.h>
+#include <asm/chpid.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 int new_channel_path(int chpid);
-
-static inline void
-set_chp_logically_online(int chp, int onoff)
-{
-	css[0]->chps[chp]->state = onoff;
-}
-
-static int
-get_chp_status(int chp)
-{
-	return (css[0]->chps[chp] ? css[0]->chps[chp]->state : -ENODEV);
-}
-
-void
-chsc_validate_chpids(struct subchannel *sch)
-{
-	int mask, chp;
-
-	for (chp = 0; chp <= 7; chp++) {
-		mask = 0x80 >> chp;
-		if (!get_chp_status(sch->schib.pmcw.chpid[chp]))
-			/* disable using this path */
-			sch->opm &= ~mask;
-	}
-}
-
-void
-chpid_is_actually_online(int chp)
-{
-	int state;
-
-	state = get_chp_status(chp);
-	if (state < 0) {
-		need_rescan = 1;
-		queue_work(slow_path_wq, &slow_path_work);
-	} else
-		WARN_ON(!state);
-}
+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 */
+} __attribute__ ((packed));
 
-/* FIXME: this is _always_ called for every subchannel. shouldn't we
- *	  process more than one at a time? */
-static int
-chsc_get_sch_desc_irq(struct subchannel *sch, void *page)
+int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
 {
-	int ccode, j;
-
-	struct {
-		struct chsc_header request;
-		u16 reserved1a:10;
-		u16 ssid:2;
-		u16 reserved1b:4;
-		u16 f_sch;	  /* first subchannel */
-		u16 reserved2;
-		u16 l_sch;	  /* last subchannel */
-		u32 reserved3;
-		struct chsc_header response;
-		u32 reserved4;
-		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 */
-	} __attribute__ ((packed)) *ssd_area;
-
-	ssd_area = page;
+	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;
 	ssd_area->request.length = 0x0010;
 	ssd_area->request.code = 0x0004;
-
-	ssd_area->ssid = sch->schid.ssid;
-	ssd_area->f_sch = sch->schid.sch_no;
-	ssd_area->l_sch = sch->schid.sch_no;
+	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) {
-		pr_debug("chsc returned with ccode = %d\n", ccode);
-		return (ccode == 3) ? -ENODEV : -EBUSY;
+		ret = (ccode == 3) ? -ENODEV : -EBUSY;
+		goto out_free;
 	}
-
-	switch (ssd_area->response.code) {
-	case 0x0001: /* everything ok */
-		break;
-	case 0x0002:
-		CIO_CRW_EVENT(2, "Invalid command!\n");
-		return -EINVAL;
-	case 0x0003:
-		CIO_CRW_EVENT(2, "Error in chsc request block!\n");
-		return -EINVAL;
-	case 0x0004:
-		CIO_CRW_EVENT(2, "Model does not provide ssd\n");
-		return -EOPNOTSUPP;
-	default:
-		CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
+	if (ssd_area->response.code != 0x0001) {
+		CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
+			      schid.ssid, schid.sch_no,
 			      ssd_area->response.code);
-		return -EIO;
+		ret = -EIO;
+		goto out_free;
 	}
-
-	/*
-	 * ssd_area->st stores the type of the detected
-	 * subchannel, with the following definitions:
-	 *
-	 * 0: I/O subchannel:	  All fields have meaning
-	 * 1: CHSC subchannel:	  Only sch_val, st and sch
-	 *			  have meaning
-	 * 2: Message subchannel: All fields except unit_addr
-	 *			  have meaning
-	 * 3: ADM subchannel:	  Only sch_val, st and sch
-	 *			  have meaning
-	 *
-	 * Other types are currently undefined.
-	 */
-	if (ssd_area->st > 3) { /* uhm, that looks strange... */
-		CIO_CRW_EVENT(0, "Strange subchannel type %d"
-			      " for sch 0.%x.%04x\n", ssd_area->st,
-			      sch->schid.ssid, 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
-		 * fields have meaning and what to do with it we just jump out
-		 */
-		return 0;
-	} else {
-		const char *type[4] = {"I/O", "chsc", "message", "ADM"};
-		CIO_CRW_EVENT(6, "ssd: sch 0.%x.%04x is %s subchannel\n",
-			      sch->schid.ssid, sch->schid.sch_no,
-			      type[ssd_area->st]);
-
-		sch->ssd_info.valid = 1;
-		sch->ssd_info.type = ssd_area->st;
+	if (!ssd_area->sch_valid) {
+		ret = -ENODEV;
+		goto out_free;
 	}
-
-	if (ssd_area->st == 0 || ssd_area->st == 2) {
-		for (j = 0; j < 8; j++) {
-			if (!((0x80 >> j) & ssd_area->path_mask &
-			      ssd_area->fla_valid_mask))
-				continue;
-			sch->ssd_info.chpid[j] = ssd_area->chpid[j];
-			sch->ssd_info.fla[j]   = ssd_area->fla[j];
+	/* Copy data */
+	ret = 0;
+	memset(ssd, 0, sizeof(struct chsc_ssd_info));
+	if ((ssd_area->st != 0) && (ssd_area->st != 2))
+		goto out_free;
+	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];
 	}
-	return 0;
+out_free:
+	free_page(page);
+	return ret;
 }
 
-int
-css_get_ssd_info(struct subchannel *sch)
+static int check_for_io_on_path(struct subchannel *sch, int mask)
 {
-	int ret;
-	void *page;
+	int cc;
 
-	page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
-	if (!page)
-		return -ENOMEM;
-	spin_lock_irq(sch->lock);
-	ret = chsc_get_sch_desc_irq(sch, page);
-	if (ret) {
-		static int cio_chsc_err_msg;
-		
-		if (!cio_chsc_err_msg) {
-			printk(KERN_ERR
-			       "chsc_get_sch_descriptions:"
-			       " Error %d while doing chsc; "
-			       "processing some machine checks may "
-			       "not work\n", ret);
-			cio_chsc_err_msg = 1;
-		}
-	}
-	spin_unlock_irq(sch->lock);
-	free_page((unsigned long)page);
-	if (!ret) {
-		int j, chpid, mask;
-		/* Allocate channel path structures, if needed. */
-		for (j = 0; j < 8; j++) {
-			mask = 0x80 >> j;
-			chpid = sch->ssd_info.chpid[j];
-			if ((sch->schib.pmcw.pim & mask) &&
-			    (get_chp_status(chpid) < 0))
-			    new_channel_path(chpid);
-		}
+	cc = stsch(sch->schid, &sch->schib);
+	if (cc)
+		return 0;
+	if (sch->schib.scsw.actl && sch->schib.pmcw.lpum == mask)
+		return 1;
+	return 0;
+}
+
+static void terminate_internal_io(struct subchannel *sch)
+{
+	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;
 	}
-	return ret;
+	/* Request retry of internal operation. */
+	device_set_intretry(sch);
+	/* Call handler. */
+	if (sch->driver && sch->driver->termination)
+		sch->driver->termination(&sch->dev);
 }
 
 static int
@@ -219,7 +141,7 @@ s390_subchannel_remove_chpid(struct device *dev, void *data)
 	int j;
 	int mask;
 	struct subchannel *sch;
-	struct channel_path *chpid;
+	struct chp_id *chpid;
 	struct schib schib;
 
 	sch = to_subchannel(dev);
@@ -243,106 +165,50 @@ s390_subchannel_remove_chpid(struct device *dev, void *data)
 	if (sch->schib.pmcw.pim == 0x80)
 		goto out_unreg;
 
-	if ((sch->schib.scsw.actl & SCSW_ACTL_DEVACT) &&
-	    (sch->schib.scsw.actl & SCSW_ACTL_SCHACT) &&
-	    (sch->schib.pmcw.lpum == mask)) {
-		int cc;
-
-		cc = cio_clear(sch);
-		if (cc == -ENODEV)
+	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->dev);
+		}
+	} else {
+		/* trigger path verification. */
+		if (sch->driver && sch->driver->verify)
+			sch->driver->verify(&sch->dev);
+		else if (sch->lpm == mask)
 			goto out_unreg;
-		/* Request retry of internal operation. */
-		device_set_intretry(sch);
-		/* Call handler. */
-		if (sch->driver && sch->driver->termination)
-			sch->driver->termination(&sch->dev);
-		goto out_unlock;
 	}
 
-	/* trigger path verification. */
-	if (sch->driver && sch->driver->verify)
-		sch->driver->verify(&sch->dev);
-	else if (sch->lpm == mask)
-		goto out_unreg;
-out_unlock:
 	spin_unlock_irq(sch->lock);
 	return 0;
+
 out_unreg:
-	spin_unlock_irq(sch->lock);
 	sch->lpm = 0;
-	if (css_enqueue_subchannel_slow(sch->schid)) {
-		css_clear_subchannel_slow_list();
-		need_rescan = 1;
-	}
+	spin_unlock_irq(sch->lock);
+	css_schedule_eval(sch->schid);
 	return 0;
 }
 
-static void
-s390_set_chpid_offline( __u8 chpid)
+void chsc_chp_offline(struct chp_id chpid)
 {
 	char dbf_txt[15];
-	struct device *dev;
 
-	sprintf(dbf_txt, "chpr%x", chpid);
+	sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
 	CIO_TRACE_EVENT(2, dbf_txt);
 
-	if (get_chp_status(chpid) <= 0)
+	if (chp_get_status(chpid) <= 0)
 		return;
-	dev = get_device(&css[0]->chps[chpid]->dev);
-	bus_for_each_dev(&css_bus_type, NULL, to_channelpath(dev),
+	bus_for_each_dev(&css_bus_type, NULL, &chpid,
 			 s390_subchannel_remove_chpid);
-
-	if (need_rescan || css_slow_subchannels_exist())
-		queue_work(slow_path_wq, &slow_path_work);
-	put_device(dev);
-}
-
-struct res_acc_data {
-	struct channel_path *chp;
-	u32 fla_mask;
-	u16 fla;
-};
-
-static int
-s390_process_res_acc_sch(struct res_acc_data *res_data, struct subchannel *sch)
-{
-	int found;
-	int chp;
-	int ccode;
-	
-	found = 0;
-	for (chp = 0; chp <= 7; chp++)
-		/*
-		 * check if chpid is in information updated by ssd
-		 */
-		if (sch->ssd_info.valid &&
-		    sch->ssd_info.chpid[chp] == res_data->chp->id &&
-		    (sch->ssd_info.fla[chp] & res_data->fla_mask)
-		    == res_data->fla) {
-			found = 1;
-			break;
-		}
-	
-	if (found == 0)
-		return 0;
-
-	/*
-	 * Do a stsch to update our subchannel structure with the
-	 * new path information and eventually check for logically
-	 * offline chpids.
-	 */
-	ccode = stsch(sch->schid, &sch->schib);
-	if (ccode > 0)
-		return 0;
-
-	return 0x80 >> chp;
 }
 
 static int
 s390_process_res_acc_new_sch(struct subchannel_id schid)
 {
 	struct schib schib;
-	int ret;
 	/*
 	 * We don't know the device yet, but since a path
 	 * may be available now to the device we'll have
@@ -353,14 +219,35 @@ s390_process_res_acc_new_sch(struct subchannel_id schid)
 	 */
 	if (stsch_err(schid, &schib))
 		/* We're through */
-		return need_rescan ? -EAGAIN : -ENXIO;
+		return -ENXIO;
 
 	/* Put it on the slow path. */
-	ret = css_enqueue_subchannel_slow(schid);
-	if (ret) {
-		css_clear_subchannel_slow_list();
-		need_rescan = 1;
-		return -EAGAIN;
+	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;
 }
@@ -379,14 +266,11 @@ __s390_process_res_acc(struct subchannel_id schid, void *data)
 		return s390_process_res_acc_new_sch(schid);
 
 	spin_lock_irq(sch->lock);
-
-	chp_mask = s390_process_res_acc_sch(res_data, sch);
-
-	if (chp_mask == 0) {
-		spin_unlock_irq(sch->lock);
-		put_device(&sch->dev);
-		return 0;
-	}
+	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 &
@@ -396,20 +280,18 @@ __s390_process_res_acc(struct subchannel_id schid, void *data)
 		device_trigger_reprobe(sch);
 	else if (sch->driver && sch->driver->verify)
 		sch->driver->verify(&sch->dev);
-
+out:
 	spin_unlock_irq(sch->lock);
 	put_device(&sch->dev);
 	return 0;
 }
 
-
-static int
-s390_process_res_acc (struct res_acc_data *res_data)
+static void s390_process_res_acc (struct res_acc_data *res_data)
 {
-	int rc;
 	char dbf_txt[15];
 
-	sprintf(dbf_txt, "accpr%x", res_data->chp->id);
+	sprintf(dbf_txt, "accpr%x.%02x", res_data->chpid.cssid,
+		res_data->chpid.id);
 	CIO_TRACE_EVENT( 2, dbf_txt);
 	if (res_data->fla != 0) {
 		sprintf(dbf_txt, "fla%x", res_data->fla);
@@ -423,12 +305,7 @@ s390_process_res_acc (struct res_acc_data *res_data)
 	 * The more information we have (info), the less scanning
 	 * will we have to do.
 	 */
-	rc = for_each_subchannel(__s390_process_res_acc, res_data);
-	if (css_slow_subchannels_exist())
-		rc = -EAGAIN;
-	else if (rc != -EAGAIN)
-		rc = 0;
-	return rc;
+	for_each_subchannel(__s390_process_res_acc, res_data);
 }
 
 static int
@@ -480,43 +357,45 @@ struct chsc_sei_area {
 	/* ccdf has to be big enough for a link-incident record */
 } __attribute__ ((packed));
 
-static int chsc_process_sei_link_incident(struct chsc_sei_area *sei_area)
+static void chsc_process_sei_link_incident(struct chsc_sei_area *sei_area)
 {
-	int chpid;
+	struct chp_id chpid;
+	int id;
 
 	CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n",
 		      sei_area->rs, sei_area->rsid);
 	if (sei_area->rs != 4)
-		return 0;
-	chpid = __get_chpid_from_lir(sei_area->ccdf);
-	if (chpid < 0)
+		return;
+	id = __get_chpid_from_lir(sei_area->ccdf);
+	if (id < 0)
 		CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n");
-	else
-		s390_set_chpid_offline(chpid);
-
-	return 0;
+	else {
+		chp_id_init(&chpid);
+		chpid.id = id;
+		chsc_chp_offline(chpid);
+	}
 }
 
-static int chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
+static void chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
 {
 	struct res_acc_data res_data;
-	struct device *dev;
+	struct chp_id chpid;
 	int status;
-	int rc;
 
 	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 0;
+		return;
+	chp_id_init(&chpid);
+	chpid.id = sei_area->rsid;
 	/* allocate a new channel path structure, if needed */
-	status = get_chp_status(sei_area->rsid);
+	status = chp_get_status(chpid);
 	if (status < 0)
-		new_channel_path(sei_area->rsid);
+		chp_new(chpid);
 	else if (!status)
-		return 0;
-	dev = get_device(&css[0]->chps[sei_area->rsid]->dev);
+		return;
 	memset(&res_data, 0, sizeof(struct res_acc_data));
-	res_data.chp = to_channelpath(dev);
+	res_data.chpid = chpid;
 	if ((sei_area->vf & 0xc0) != 0) {
 		res_data.fla = sei_area->fla;
 		if ((sei_area->vf & 0xc0) == 0xc0)
@@ -526,51 +405,82 @@ static int chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
 			/* link address */
 			res_data.fla_mask = 0xff00;
 	}
-	rc = s390_process_res_acc(&res_data);
-	put_device(dev);
-
-	return rc;
+	s390_process_res_acc(&res_data);
 }
 
-static int chsc_process_sei(struct chsc_sei_area *sei_area)
+struct chp_config_data {
+	u8 map[32];
+	u8 op;
+	u8 pc;
+};
+
+static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area)
 {
-	int rc;
+	struct chp_config_data *data;
+	struct chp_id chpid;
+	int num;
+
+	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;
+		printk(KERN_WARNING "cio: processing configure event %d for "
+		       "chpid %x.%02x\n", 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(struct chsc_sei_area *sei_area)
+{
 	/* Check if we might have lost some information. */
-	if (sei_area->flags & 0x40)
+	if (sei_area->flags & 0x40) {
 		CIO_CRW_EVENT(2, "chsc: event overflow\n");
+		css_schedule_eval_all();
+	}
 	/* which kind of information was stored? */
-	rc = 0;
 	switch (sei_area->cc) {
 	case 1: /* link incident*/
-		rc = chsc_process_sei_link_incident(sei_area);
+		chsc_process_sei_link_incident(sei_area);
 		break;
 	case 2: /* i/o resource accessibiliy */
-		rc = chsc_process_sei_res_acc(sei_area);
+		chsc_process_sei_res_acc(sei_area);
+		break;
+	case 8: /* channel-path-configuration notification */
+		chsc_process_sei_chp_config(sei_area);
 		break;
 	default: /* other stuff */
 		CIO_CRW_EVENT(4, "chsc: unhandled sei content code %d\n",
 			      sei_area->cc);
 		break;
 	}
-
-	return rc;
 }
 
-int chsc_process_crw(void)
+void chsc_process_crw(void)
 {
 	struct chsc_sei_area *sei_area;
-	int ret;
-	int rc;
 
 	if (!sei_page)
-		return 0;
+		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");
-	ret = 0;
 	do {
 		memset(sei_area, 0, sizeof(*sei_area));
 		sei_area->request.length = 0x0010;
@@ -580,37 +490,26 @@ int chsc_process_crw(void)
 
 		if (sei_area->response.code == 0x0001) {
 			CIO_CRW_EVENT(4, "chsc: sei successful\n");
-			rc = chsc_process_sei(sei_area);
-			if (rc)
-				ret = rc;
+			chsc_process_sei(sei_area);
 		} else {
 			CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
 				      sei_area->response.code);
-			ret = 0;
 			break;
 		}
 	} while (sei_area->flags & 0x80);
-
-	return ret;
 }
 
 static int
 __chp_add_new_sch(struct subchannel_id schid)
 {
 	struct schib schib;
-	int ret;
 
 	if (stsch_err(schid, &schib))
 		/* We're through */
-		return need_rescan ? -EAGAIN : -ENXIO;
+		return -ENXIO;
 
 	/* Put it on the slow path. */
-	ret = css_enqueue_subchannel_slow(schid);
-	if (ret) {
-		css_clear_subchannel_slow_list();
-		need_rescan = 1;
-		return -EAGAIN;
-	}
+	css_schedule_eval(schid);
 	return 0;
 }
 
@@ -619,10 +518,10 @@ static int
 __chp_add(struct subchannel_id schid, void *data)
 {
 	int i, mask;
-	struct channel_path *chp;
+	struct chp_id *chpid;
 	struct subchannel *sch;
 
-	chp = data;
+	chpid = data;
 	sch = get_subchannel_by_schid(schid);
 	if (!sch)
 		/* Check if the subchannel is now available. */
@@ -631,7 +530,7 @@ __chp_add(struct subchannel_id schid, void *data)
 	for (i=0; i<8; i++) {
 		mask = 0x80 >> i;
 		if ((sch->schib.pmcw.pim & mask) &&
-		    (sch->schib.pmcw.chpid[i] == chp->id)) {
+		    (sch->schib.pmcw.chpid[i] == chpid->id)) {
 			if (stsch(sch->schid, &sch->schib) != 0) {
 				/* Endgame. */
 				spin_unlock_irq(sch->lock);
@@ -657,122 +556,58 @@ __chp_add(struct subchannel_id schid, void *data)
 	return 0;
 }
 
-static int
-chp_add(int chpid)
+void chsc_chp_online(struct chp_id chpid)
 {
-	int rc;
 	char dbf_txt[15];
-	struct device *dev;
 
-	if (!get_chp_status(chpid))
-		return 0; /* no need to do the rest */
-	
-	sprintf(dbf_txt, "cadd%x", chpid);
+	sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 	CIO_TRACE_EVENT(2, dbf_txt);
 
-	dev = get_device(&css[0]->chps[chpid]->dev);
-	rc = for_each_subchannel(__chp_add, to_channelpath(dev));
-	if (css_slow_subchannels_exist())
-		rc = -EAGAIN;
-	if (rc != -EAGAIN)
-		rc = 0;
-	put_device(dev);
-	return rc;
+	if (chp_get_status(chpid) != 0)
+		for_each_subchannel(__chp_add, &chpid);
 }
 
-/* 
- * Handling of crw machine checks with channel path source.
- */
-int
-chp_process_crw(int chpid, int on)
-{
-	if (on == 0) {
-		/* Path has gone. We use the link incident routine.*/
-		s390_set_chpid_offline(chpid);
-		return 0; /* De-register is async anyway. */
-	}
-	/*
-	 * Path has come. Allocate a new channel path structure,
-	 * if needed.
-	 */
-	if (get_chp_status(chpid) < 0)
-		new_channel_path(chpid);
-	/* Avoid the extra overhead in process_rec_acc. */
-	return chp_add(chpid);
-}
-
-static int check_for_io_on_path(struct subchannel *sch, int index)
-{
-	int cc;
-
-	cc = stsch(sch->schid, &sch->schib);
-	if (cc)
-		return 0;
-	if (sch->schib.scsw.actl && sch->schib.pmcw.lpum == (0x80 >> index))
-		return 1;
-	return 0;
-}
-
-static void terminate_internal_io(struct subchannel *sch)
-{
-	if (cio_clear(sch)) {
-		/* Recheck device in case clear failed. */
-		sch->lpm = 0;
-		if (device_trigger_verify(sch) != 0) {
-			if(css_enqueue_subchannel_slow(sch->schid)) {
-				css_clear_subchannel_slow_list();
-				need_rescan = 1;
-			}
-		}
-		return;
-	}
-	/* Request retry of internal operation. */
-	device_set_intretry(sch);
-	/* Call handler. */
-	if (sch->driver && sch->driver->termination)
-		sch->driver->termination(&sch->dev);
-}
-
-static void
-__s390_subchannel_vary_chpid(struct subchannel *sch, __u8 chpid, int on)
+static void __s390_subchannel_vary_chpid(struct subchannel *sch,
+					 struct chp_id chpid, int on)
 {
 	int chp, old_lpm;
+	int mask;
 	unsigned long flags;
 
-	if (!sch->ssd_info.valid)
-		return;
-	
 	spin_lock_irqsave(sch->lock, flags);
 	old_lpm = sch->lpm;
 	for (chp = 0; chp < 8; chp++) {
-		if (sch->ssd_info.chpid[chp] != chpid)
+		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 |= (0x80 >> chp);
-			sch->lpm |= (0x80 >> chp);
+			sch->opm |= mask;
+			sch->lpm |= mask;
 			if (!old_lpm)
 				device_trigger_reprobe(sch);
 			else if (sch->driver && sch->driver->verify)
 				sch->driver->verify(&sch->dev);
 			break;
 		}
-		sch->opm &= ~(0x80 >> chp);
-		sch->lpm &= ~(0x80 >> chp);
-		if (check_for_io_on_path(sch, chp)) {
+		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
+			else {
 				/* Kill and retry internal I/O. */
 				terminate_internal_io(sch);
-		} else if (!sch->lpm) {
-			if (device_trigger_verify(sch) != 0) {
-				if (css_enqueue_subchannel_slow(sch->schid)) {
-					css_clear_subchannel_slow_list();
-					need_rescan = 1;
-				}
+				/* Re-start path verification. */
+				if (sch->driver && sch->driver->verify)
+					sch->driver->verify(&sch->dev);
 			}
+		} 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->dev);
 		break;
@@ -780,11 +615,10 @@ __s390_subchannel_vary_chpid(struct subchannel *sch, __u8 chpid, int on)
 	spin_unlock_irqrestore(sch->lock, flags);
 }
 
-static int
-s390_subchannel_vary_chpid_off(struct device *dev, void *data)
+static int s390_subchannel_vary_chpid_off(struct device *dev, void *data)
 {
 	struct subchannel *sch;
-	__u8 *chpid;
+	struct chp_id *chpid;
 
 	sch = to_subchannel(dev);
 	chpid = data;
@@ -793,11 +627,10 @@ s390_subchannel_vary_chpid_off(struct device *dev, void *data)
 	return 0;
 }
 
-static int
-s390_subchannel_vary_chpid_on(struct device *dev, void *data)
+static int s390_subchannel_vary_chpid_on(struct device *dev, void *data)
 {
 	struct subchannel *sch;
-	__u8 *chpid;
+	struct chp_id *chpid;
 
 	sch = to_subchannel(dev);
 	chpid = data;
@@ -821,40 +654,17 @@ __s390_vary_chpid_on(struct subchannel_id schid, void *data)
 		/* We're through */
 		return -ENXIO;
 	/* Put it on the slow path. */
-	if (css_enqueue_subchannel_slow(schid)) {
-		css_clear_subchannel_slow_list();
-		need_rescan = 1;
-		return -EAGAIN;
-	}
+	css_schedule_eval(schid);
 	return 0;
 }
 
-/*
- * Function: s390_vary_chpid
- * Varies the specified chpid online or offline
+/**
+ * chsc_chp_vary - propagate channel-path vary operation to subchannels
+ * @chpid: channl-path ID
+ * @on: non-zero for vary online, zero for vary offline
  */
-static int
-s390_vary_chpid( __u8 chpid, int on)
+int chsc_chp_vary(struct chp_id chpid, int on)
 {
-	char dbf_text[15];
-	int status;
-
-	sprintf(dbf_text, on?"varyon%x":"varyoff%x", chpid);
-	CIO_TRACE_EVENT( 2, dbf_text);
-
-	status = get_chp_status(chpid);
-	if (status < 0) {
-		printk(KERN_ERR "Can't vary unknown chpid %02X\n", chpid);
-		return -EINVAL;
-	}
-
-	if (!on && !status) {
-		printk(KERN_ERR "chpid %x is already offline\n", chpid);
-		return -EINVAL;
-	}
-
-	set_chp_logically_online(chpid, on);
-
 	/*
 	 * Redo PathVerification on the devices the chpid connects to
 	 */
@@ -865,118 +675,9 @@ s390_vary_chpid( __u8 chpid, int on)
 	if (on)
 		/* Scan for new devices on varied on path. */
 		for_each_subchannel(__s390_vary_chpid_on, NULL);
-	if (need_rescan || css_slow_subchannels_exist())
-		queue_work(slow_path_wq, &slow_path_work);
 	return 0;
 }
 
-/*
- * Channel measurement related functions
- */
-static ssize_t
-chp_measurement_chars_read(struct kobject *kobj, char *buf, loff_t off,
-			   size_t count)
-{
-	struct channel_path *chp;
-	unsigned int size;
-
-	chp = to_channelpath(container_of(kobj, struct device, kobj));
-	if (!chp->cmg_chars)
-		return 0;
-
-	size = sizeof(struct cmg_chars);
-
-	if (off > size)
-		return 0;
-	if (off + count > size)
-		count = size - off;
-	memcpy(buf, chp->cmg_chars + off, count);
-	return count;
-}
-
-static struct bin_attribute chp_measurement_chars_attr = {
-	.attr = {
-		.name = "measurement_chars",
-		.mode = S_IRUSR,
-		.owner = THIS_MODULE,
-	},
-	.size = sizeof(struct cmg_chars),
-	.read = chp_measurement_chars_read,
-};
-
-static void
-chp_measurement_copy_block(struct cmg_entry *buf,
-			   struct channel_subsystem *css, int chpid)
-{
-	void *area;
-	struct cmg_entry *entry, reference_buf;
-	int idx;
-
-	if (chpid < 128) {
-		area = css->cub_addr1;
-		idx = chpid;
-	} else {
-		area = css->cub_addr2;
-		idx = chpid - 128;
-	}
-	entry = area + (idx * sizeof(struct cmg_entry));
-	do {
-		memcpy(buf, entry, sizeof(*entry));
-		memcpy(&reference_buf, entry, sizeof(*entry));
-	} while (reference_buf.values[0] != buf->values[0]);
-}
-
-static ssize_t
-chp_measurement_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
-{
-	struct channel_path *chp;
-	struct channel_subsystem *css;
-	unsigned int size;
-
-	chp = to_channelpath(container_of(kobj, struct device, kobj));
-	css = to_css(chp->dev.parent);
-
-	size = sizeof(struct cmg_entry);
-
-	/* Only allow single reads. */
-	if (off || count < size)
-		return 0;
-	chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->id);
-	count = size;
-	return count;
-}
-
-static struct bin_attribute chp_measurement_attr = {
-	.attr = {
-		.name = "measurement",
-		.mode = S_IRUSR,
-		.owner = THIS_MODULE,
-	},
-	.size = sizeof(struct cmg_entry),
-	.read = chp_measurement_read,
-};
-
-static void
-chsc_remove_chp_cmg_attr(struct channel_path *chp)
-{
-	device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr);
-	device_remove_bin_file(&chp->dev, &chp_measurement_attr);
-}
-
-static int
-chsc_add_chp_cmg_attr(struct channel_path *chp)
-{
-	int ret;
-
-	ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr);
-	if (ret)
-		return ret;
-	ret = device_create_bin_file(&chp->dev, &chp_measurement_attr);
-	if (ret)
-		device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr);
-	return ret;
-}
-
 static void
 chsc_remove_cmg_attr(struct channel_subsystem *css)
 {
@@ -985,7 +686,7 @@ chsc_remove_cmg_attr(struct channel_subsystem *css)
 	for (i = 0; i <= __MAX_CHPID; i++) {
 		if (!css->chps[i])
 			continue;
-		chsc_remove_chp_cmg_attr(css->chps[i]);
+		chp_remove_cmg_attr(css->chps[i]);
 	}
 }
 
@@ -998,7 +699,7 @@ chsc_add_cmg_attr(struct channel_subsystem *css)
 	for (i = 0; i <= __MAX_CHPID; i++) {
 		if (!css->chps[i])
 			continue;
-		ret = chsc_add_chp_cmg_attr(css->chps[i]);
+		ret = chp_add_cmg_attr(css->chps[i]);
 		if (ret)
 			goto cleanup;
 	}
@@ -1007,12 +708,11 @@ cleanup:
 	for (--i; i >= 0; i--) {
 		if (!css->chps[i])
 			continue;
-		chsc_remove_chp_cmg_attr(css->chps[i]);
+		chp_remove_cmg_attr(css->chps[i]);
 	}
 	return ret;
 }
 
-
 static int
 __chsc_do_secm(struct channel_subsystem *css, int enable, void *page)
 {
@@ -1118,7 +818,7 @@ chsc_secm(struct channel_subsystem *css, int enable)
 		} else
 			chsc_remove_cmg_attr(css);
 	}
-	if (enable && !css->cm_enabled) {
+	if (!css->cm_enabled) {
 		free_page((unsigned long)css->cub_addr1);
 		free_page((unsigned long)css->cub_addr2);
 	}
@@ -1127,109 +827,8 @@ chsc_secm(struct channel_subsystem *css, int enable)
 	return ret;
 }
 
-/*
- * Files for the channel path entries.
- */
-static ssize_t
-chp_status_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	struct channel_path *chp = container_of(dev, struct channel_path, dev);
-
-	if (!chp)
-		return 0;
-	return (get_chp_status(chp->id) ? sprintf(buf, "online\n") :
-		sprintf(buf, "offline\n"));
-}
-
-static ssize_t
-chp_status_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
-{
-	struct channel_path *cp = container_of(dev, struct channel_path, dev);
-	char cmd[10];
-	int num_args;
-	int error;
-
-	num_args = sscanf(buf, "%5s", cmd);
-	if (!num_args)
-		return count;
-
-	if (!strnicmp(cmd, "on", 2))
-		error = s390_vary_chpid(cp->id, 1);
-	else if (!strnicmp(cmd, "off", 3))
-		error = s390_vary_chpid(cp->id, 0);
-	else
-		error = -EINVAL;
-
-	return error < 0 ? error : count;
-
-}
-
-static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write);
-
-static ssize_t
-chp_type_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	struct channel_path *chp = container_of(dev, struct channel_path, dev);
-
-	if (!chp)
-		return 0;
-	return sprintf(buf, "%x\n", chp->desc.desc);
-}
-
-static DEVICE_ATTR(type, 0444, chp_type_show, NULL);
-
-static ssize_t
-chp_cmg_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	struct channel_path *chp = to_channelpath(dev);
-
-	if (!chp)
-		return 0;
-	if (chp->cmg == -1) /* channel measurements not available */
-		return sprintf(buf, "unknown\n");
-	return sprintf(buf, "%x\n", chp->cmg);
-}
-
-static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL);
-
-static ssize_t
-chp_shared_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	struct channel_path *chp = to_channelpath(dev);
-
-	if (!chp)
-		return 0;
-	if (chp->shared == -1) /* channel measurements not available */
-		return sprintf(buf, "unknown\n");
-	return sprintf(buf, "%x\n", chp->shared);
-}
-
-static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL);
-
-static struct attribute * chp_attrs[] = {
-	&dev_attr_status.attr,
-	&dev_attr_type.attr,
-	&dev_attr_cmg.attr,
-	&dev_attr_shared.attr,
-	NULL,
-};
-
-static struct attribute_group chp_attr_group = {
-	.attrs = chp_attrs,
-};
-
-static void
-chp_release(struct device *dev)
-{
-	struct channel_path *cp;
-	
-	cp = container_of(dev, struct channel_path, dev);
-	kfree(cp);
-}
-
-static int
-chsc_determine_channel_path_description(int chpid,
-					struct channel_path_desc *desc)
+int chsc_determine_channel_path_description(struct chp_id chpid,
+					    struct channel_path_desc *desc)
 {
 	int ccode, ret;
 
@@ -1252,8 +851,8 @@ chsc_determine_channel_path_description(int chpid,
 	scpd_area->request.length = 0x0010;
 	scpd_area->request.code = 0x0002;
 
-	scpd_area->first_chpid = chpid;
-	scpd_area->last_chpid = chpid;
+	scpd_area->first_chpid = chpid.id;
+	scpd_area->last_chpid = chpid.id;
 
 	ccode = chsc(scpd_area);
 	if (ccode > 0) {
@@ -1316,8 +915,7 @@ chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
 	}
 }
 
-static int
-chsc_get_channel_measurement_chars(struct channel_path *chp)
+int chsc_get_channel_measurement_chars(struct channel_path *chp)
 {
 	int ccode, ret;
 
@@ -1349,8 +947,8 @@ chsc_get_channel_measurement_chars(struct channel_path *chp)
 	scmc_area->request.length = 0x0010;
 	scmc_area->request.code = 0x0022;
 
-	scmc_area->first_chpid = chp->id;
-	scmc_area->last_chpid = chp->id;
+	scmc_area->first_chpid = chp->chpid.id;
+	scmc_area->last_chpid = chp->chpid.id;
 
 	ccode = chsc(scmc_area);
 	if (ccode > 0) {
@@ -1392,94 +990,6 @@ out:
 	return ret;
 }
 
-/*
- * Entries for chpids on the system bus.
- * This replaces /proc/chpids.
- */
-static int
-new_channel_path(int chpid)
-{
-	struct channel_path *chp;
-	int ret;
-
-	chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL);
-	if (!chp)
-		return -ENOMEM;
-
-	/* fill in status, etc. */
-	chp->id = chpid;
-	chp->state = 1;
-	chp->dev.parent = &css[0]->device;
-	chp->dev.release = chp_release;
-	snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp0.%x", chpid);
-
-	/* Obtain channel path description and fill it in. */
-	ret = chsc_determine_channel_path_description(chpid, &chp->desc);
-	if (ret)
-		goto out_free;
-	/* Get channel-measurement characteristics. */
-	if (css_characteristics_avail && css_chsc_characteristics.scmc
-	    && css_chsc_characteristics.secm) {
-		ret = chsc_get_channel_measurement_chars(chp);
-		if (ret)
-			goto out_free;
-	} else {
-		static int msg_done;
-
-		if (!msg_done) {
-			printk(KERN_WARNING "cio: Channel measurements not "
-			       "available, continuing.\n");
-			msg_done = 1;
-		}
-		chp->cmg = -1;
-	}
-
-	/* make it known to the system */
-	ret = device_register(&chp->dev);
-	if (ret) {
-		printk(KERN_WARNING "%s: could not register %02x\n",
-		       __func__, chpid);
-		goto out_free;
-	}
-	ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group);
-	if (ret) {
-		device_unregister(&chp->dev);
-		goto out_free;
-	}
-	mutex_lock(&css[0]->mutex);
-	if (css[0]->cm_enabled) {
-		ret = chsc_add_chp_cmg_attr(chp);
-		if (ret) {
-			sysfs_remove_group(&chp->dev.kobj, &chp_attr_group);
-			device_unregister(&chp->dev);
-			mutex_unlock(&css[0]->mutex);
-			goto out_free;
-		}
-	}
-	css[0]->chps[chpid] = chp;
-	mutex_unlock(&css[0]->mutex);
-	return ret;
-out_free:
-	kfree(chp);
-	return ret;
-}
-
-void *
-chsc_get_chp_desc(struct subchannel *sch, int chp_no)
-{
-	struct channel_path *chp;
-	struct channel_path_desc *desc;
-
-	chp = css[0]->chps[sch->schib.pmcw.chpid[chp_no]];
-	if (!chp)
-		return NULL;
-	desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL);
-	if (!desc)
-		return NULL;
-	memcpy(desc, &chp->desc, sizeof(struct channel_path_desc));
-	return desc;
-}
-
 static int __init
 chsc_alloc_sei_area(void)
 {