Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 1461 insertions, 0 deletions

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
new file mode 100644
index 0000000000..3ff46fc694
--- /dev/null
+++ b/drivers/s390/cio/css.c
@@ -0,0 +1,1461 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * driver for channel subsystem
+ *
+ * Copyright IBM Corp. 2002, 2010
+ *
+ * Author(s): Arnd Bergmann (arndb@de.ibm.com)
+ *	      Cornelia Huck (cornelia.huck@de.ibm.com)
+ */
+
+#define KMSG_COMPONENT "cio"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/list.h>
+#include <linux/reboot.h>
+#include <linux/proc_fs.h>
+#include <linux/genalloc.h>
+#include <linux/dma-mapping.h>
+#include <asm/isc.h>
+#include <asm/crw.h>
+
+#include "css.h"
+#include "cio.h"
+#include "blacklist.h"
+#include "cio_debug.h"
+#include "ioasm.h"
+#include "chsc.h"
+#include "device.h"
+#include "idset.h"
+#include "chp.h"
+
+int css_init_done = 0;
+int max_ssid;
+
+#define MAX_CSS_IDX 0
+struct channel_subsystem *channel_subsystems[MAX_CSS_IDX + 1];
+static struct bus_type css_bus_type;
+
+int
+for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data)
+{
+	struct subchannel_id schid;
+	int ret;
+
+	init_subchannel_id(&schid);
+	do {
+		do {
+			ret = fn(schid, data);
+			if (ret)
+				break;
+		} while (schid.sch_no++ < __MAX_SUBCHANNEL);
+		schid.sch_no = 0;
+	} while (schid.ssid++ < max_ssid);
+	return ret;
+}
+
+struct cb_data {
+	void *data;
+	struct idset *set;
+	int (*fn_known_sch)(struct subchannel *, void *);
+	int (*fn_unknown_sch)(struct subchannel_id, void *);
+};
+
+static int call_fn_known_sch(struct device *dev, void *data)
+{
+	struct subchannel *sch = to_subchannel(dev);
+	struct cb_data *cb = data;
+	int rc = 0;
+
+	if (cb->set)
+		idset_sch_del(cb->set, sch->schid);
+	if (cb->fn_known_sch)
+		rc = cb->fn_known_sch(sch, cb->data);
+	return rc;
+}
+
+static int call_fn_unknown_sch(struct subchannel_id schid, void *data)
+{
+	struct cb_data *cb = data;
+	int rc = 0;
+
+	if (idset_sch_contains(cb->set, schid))
+		rc = cb->fn_unknown_sch(schid, cb->data);
+	return rc;
+}
+
+static int call_fn_all_sch(struct subchannel_id schid, void *data)
+{
+	struct cb_data *cb = data;
+	struct subchannel *sch;
+	int rc = 0;
+
+	sch = get_subchannel_by_schid(schid);
+	if (sch) {
+		if (cb->fn_known_sch)
+			rc = cb->fn_known_sch(sch, cb->data);
+		put_device(&sch->dev);
+	} else {
+		if (cb->fn_unknown_sch)
+			rc = cb->fn_unknown_sch(schid, cb->data);
+	}
+
+	return rc;
+}
+
+int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),
+			       int (*fn_unknown)(struct subchannel_id,
+			       void *), void *data)
+{
+	struct cb_data cb;
+	int rc;
+
+	cb.data = data;
+	cb.fn_known_sch = fn_known;
+	cb.fn_unknown_sch = fn_unknown;
+
+	if (fn_known && !fn_unknown) {
+		/* Skip idset allocation in case of known-only loop. */
+		cb.set = NULL;
+		return bus_for_each_dev(&css_bus_type, NULL, &cb,
+					call_fn_known_sch);
+	}
+
+	cb.set = idset_sch_new();
+	if (!cb.set)
+		/* fall back to brute force scanning in case of oom */
+		return for_each_subchannel(call_fn_all_sch, &cb);
+
+	idset_fill(cb.set);
+
+	/* Process registered subchannels. */
+	rc = bus_for_each_dev(&css_bus_type, NULL, &cb, call_fn_known_sch);
+	if (rc)
+		goto out;
+	/* Process unregistered subchannels. */
+	if (fn_unknown)
+		rc = for_each_subchannel(call_fn_unknown_sch, &cb);
+out:
+	idset_free(cb.set);
+
+	return rc;
+}
+
+static void css_sch_todo(struct work_struct *work);
+
+static int css_sch_create_locks(struct subchannel *sch)
+{
+	sch->lock = kmalloc(sizeof(*sch->lock), GFP_KERNEL);
+	if (!sch->lock)
+		return -ENOMEM;
+
+	spin_lock_init(sch->lock);
+	mutex_init(&sch->reg_mutex);
+
+	return 0;
+}
+
+static void css_subchannel_release(struct device *dev)
+{
+	struct subchannel *sch = to_subchannel(dev);
+
+	sch->config.intparm = 0;
+	cio_commit_config(sch);
+	kfree(sch->driver_override);
+	kfree(sch->lock);
+	kfree(sch);
+}
+
+static int css_validate_subchannel(struct subchannel_id schid,
+				   struct schib *schib)
+{
+	int err;
+
+	switch (schib->pmcw.st) {
+	case SUBCHANNEL_TYPE_IO:
+	case SUBCHANNEL_TYPE_MSG:
+		if (!css_sch_is_valid(schib))
+			err = -ENODEV;
+		else if (is_blacklisted(schid.ssid, schib->pmcw.dev)) {
+			CIO_MSG_EVENT(6, "Blacklisted device detected "
+				      "at devno %04X, subchannel set %x\n",
+				      schib->pmcw.dev, schid.ssid);
+			err = -ENODEV;
+		} else
+			err = 0;
+		break;
+	default:
+		err = 0;
+	}
+	if (err)
+		goto out;
+
+	CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n",
+		      schid.ssid, schid.sch_no, schib->pmcw.st);
+out:
+	return err;
+}
+
+struct subchannel *css_alloc_subchannel(struct subchannel_id schid,
+					struct schib *schib)
+{
+	struct subchannel *sch;
+	int ret;
+
+	ret = css_validate_subchannel(schid, schib);
+	if (ret < 0)
+		return ERR_PTR(ret);
+
+	sch = kzalloc(sizeof(*sch), GFP_KERNEL | GFP_DMA);
+	if (!sch)
+		return ERR_PTR(-ENOMEM);
+
+	sch->schid = schid;
+	sch->schib = *schib;
+	sch->st = schib->pmcw.st;
+
+	ret = css_sch_create_locks(sch);
+	if (ret)
+		goto err;
+
+	INIT_WORK(&sch->todo_work, css_sch_todo);
+	sch->dev.release = &css_subchannel_release;
+	sch->dev.dma_mask = &sch->dma_mask;
+	device_initialize(&sch->dev);
+	/*
+	 * The physical addresses for some of the dma structures that can
+	 * belong to a subchannel need to fit 31 bit width (e.g. ccw).
+	 */
+	ret = dma_set_coherent_mask(&sch->dev, DMA_BIT_MASK(31));
+	if (ret)
+		goto err_lock;
+	/*
+	 * But we don't have such restrictions imposed on the stuff that
+	 * is handled by the streaming API.
+	 */
+	ret = dma_set_mask(&sch->dev, DMA_BIT_MASK(64));
+	if (ret)
+		goto err_lock;
+
+	return sch;
+
+err_lock:
+	kfree(sch->lock);
+err:
+	kfree(sch);
+	return ERR_PTR(ret);
+}
+
+static int css_sch_device_register(struct subchannel *sch)
+{
+	int ret;
+
+	mutex_lock(&sch->reg_mutex);
+	dev_set_name(&sch->dev, "0.%x.%04x", sch->schid.ssid,
+		     sch->schid.sch_no);
+	ret = device_add(&sch->dev);
+	mutex_unlock(&sch->reg_mutex);
+	return ret;
+}
+
+/**
+ * css_sch_device_unregister - unregister a subchannel
+ * @sch: subchannel to be unregistered
+ */
+void css_sch_device_unregister(struct subchannel *sch)
+{
+	mutex_lock(&sch->reg_mutex);
+	if (device_is_registered(&sch->dev))
+		device_unregister(&sch->dev);
+	mutex_unlock(&sch->reg_mutex);
+}
+EXPORT_SYMBOL_GPL(css_sch_device_unregister);
+
+static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw)
+{
+	int i;
+	int mask;
+
+	memset(ssd, 0, sizeof(struct chsc_ssd_info));
+	ssd->path_mask = pmcw->pim;
+	for (i = 0; i < 8; i++) {
+		mask = 0x80 >> i;
+		if (pmcw->pim & mask) {
+			chp_id_init(&ssd->chpid[i]);
+			ssd->chpid[i].id = pmcw->chpid[i];
+		}
+	}
+}
+
+static void ssd_register_chpids(struct chsc_ssd_info *ssd)
+{
+	int i;
+	int mask;
+
+	for (i = 0; i < 8; i++) {
+		mask = 0x80 >> i;
+		if (ssd->path_mask & mask)
+			chp_new(ssd->chpid[i]);
+	}
+}
+
+void css_update_ssd_info(struct subchannel *sch)
+{
+	int ret;
+
+	ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info);
+	if (ret)
+		ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw);
+
+	ssd_register_chpids(&sch->ssd_info);
+}
+
+static ssize_t type_show(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct subchannel *sch = to_subchannel(dev);
+
+	return sprintf(buf, "%01x\n", sch->st);
+}
+
+static DEVICE_ATTR_RO(type);
+
+static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
+			     char *buf)
+{
+	struct subchannel *sch = to_subchannel(dev);
+
+	return sprintf(buf, "css:t%01X\n", sch->st);
+}
+
+static DEVICE_ATTR_RO(modalias);
+
+static ssize_t driver_override_store(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	struct subchannel *sch = to_subchannel(dev);
+	int ret;
+
+	ret = driver_set_override(dev, &sch->driver_override, buf, count);
+	if (ret)
+		return ret;
+
+	return count;
+}
+
+static ssize_t driver_override_show(struct device *dev,
+				    struct device_attribute *attr, char *buf)
+{
+	struct subchannel *sch = to_subchannel(dev);
+	ssize_t len;
+
+	device_lock(dev);
+	len = snprintf(buf, PAGE_SIZE, "%s\n", sch->driver_override);
+	device_unlock(dev);
+	return len;
+}
+static DEVICE_ATTR_RW(driver_override);
+
+static struct attribute *subch_attrs[] = {
+	&dev_attr_type.attr,
+	&dev_attr_modalias.attr,
+	&dev_attr_driver_override.attr,
+	NULL,
+};
+
+static struct attribute_group subch_attr_group = {
+	.attrs = subch_attrs,
+};
+
+static const struct attribute_group *default_subch_attr_groups[] = {
+	&subch_attr_group,
+	NULL,
+};
+
+static ssize_t chpids_show(struct device *dev,
+			   struct device_attribute *attr,
+			   char *buf)
+{
+	struct subchannel *sch = to_subchannel(dev);
+	struct chsc_ssd_info *ssd = &sch->ssd_info;
+	ssize_t ret = 0;
+	int mask;
+	int chp;
+
+	for (chp = 0; chp < 8; chp++) {
+		mask = 0x80 >> chp;
+		if (ssd->path_mask & mask)
+			ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id);
+		else
+			ret += sprintf(buf + ret, "00 ");
+	}
+	ret += sprintf(buf + ret, "\n");
+	return ret;
+}
+static DEVICE_ATTR_RO(chpids);
+
+static ssize_t pimpampom_show(struct device *dev,
+			      struct device_attribute *attr,
+			      char *buf)
+{
+	struct subchannel *sch = to_subchannel(dev);
+	struct pmcw *pmcw = &sch->schib.pmcw;
+
+	return sprintf(buf, "%02x %02x %02x\n",
+		       pmcw->pim, pmcw->pam, pmcw->pom);
+}
+static DEVICE_ATTR_RO(pimpampom);
+
+static ssize_t dev_busid_show(struct device *dev,
+			      struct device_attribute *attr,
+			      char *buf)
+{
+	struct subchannel *sch = to_subchannel(dev);
+	struct pmcw *pmcw = &sch->schib.pmcw;
+
+	if ((pmcw->st == SUBCHANNEL_TYPE_IO && pmcw->dnv) ||
+	    (pmcw->st == SUBCHANNEL_TYPE_MSG && pmcw->w))
+		return sysfs_emit(buf, "0.%x.%04x\n", sch->schid.ssid,
+				  pmcw->dev);
+	else
+		return sysfs_emit(buf, "none\n");
+}
+static DEVICE_ATTR_RO(dev_busid);
+
+static struct attribute *io_subchannel_type_attrs[] = {
+	&dev_attr_chpids.attr,
+	&dev_attr_pimpampom.attr,
+	&dev_attr_dev_busid.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(io_subchannel_type);
+
+static const struct device_type io_subchannel_type = {
+	.groups = io_subchannel_type_groups,
+};
+
+int css_register_subchannel(struct subchannel *sch)
+{
+	int ret;
+
+	/* Initialize the subchannel structure */
+	sch->dev.parent = &channel_subsystems[0]->device;
+	sch->dev.bus = &css_bus_type;
+	sch->dev.groups = default_subch_attr_groups;
+
+	if (sch->st == SUBCHANNEL_TYPE_IO)
+		sch->dev.type = &io_subchannel_type;
+
+	css_update_ssd_info(sch);
+	/* make it known to the system */
+	ret = css_sch_device_register(sch);
+	if (ret) {
+		CIO_MSG_EVENT(0, "Could not register sch 0.%x.%04x: %d\n",
+			      sch->schid.ssid, sch->schid.sch_no, ret);
+		return ret;
+	}
+	return ret;
+}
+
+static int css_probe_device(struct subchannel_id schid, struct schib *schib)
+{
+	struct subchannel *sch;
+	int ret;
+
+	sch = css_alloc_subchannel(schid, schib);
+	if (IS_ERR(sch))
+		return PTR_ERR(sch);
+
+	ret = css_register_subchannel(sch);
+	if (ret)
+		put_device(&sch->dev);
+
+	return ret;
+}
+
+static int
+check_subchannel(struct device *dev, const void *data)
+{
+	struct subchannel *sch;
+	struct subchannel_id *schid = (void *)data;
+
+	sch = to_subchannel(dev);
+	return schid_equal(&sch->schid, schid);
+}
+
+struct subchannel *
+get_subchannel_by_schid(struct subchannel_id schid)
+{
+	struct device *dev;
+
+	dev = bus_find_device(&css_bus_type, NULL,
+			      &schid, check_subchannel);
+
+	return dev ? to_subchannel(dev) : NULL;
+}
+
+/**
+ * css_sch_is_valid() - check if a subchannel is valid
+ * @schib: subchannel information block for the subchannel
+ */
+int css_sch_is_valid(struct schib *schib)
+{
+	if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv)
+		return 0;
+	if ((schib->pmcw.st == SUBCHANNEL_TYPE_MSG) && !schib->pmcw.w)
+		return 0;
+	return 1;
+}
+EXPORT_SYMBOL_GPL(css_sch_is_valid);
+
+static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow)
+{
+	struct schib schib;
+	int ccode;
+
+	if (!slow) {
+		/* Will be done on the slow path. */
+		return -EAGAIN;
+	}
+	/*
+	 * The first subchannel that is not-operational (ccode==3)
+	 * indicates that there aren't any more devices available.
+	 * If stsch gets an exception, it means the current subchannel set
+	 * is not valid.
+	 */
+	ccode = stsch(schid, &schib);
+	if (ccode)
+		return (ccode == 3) ? -ENXIO : ccode;
+
+	return css_probe_device(schid, &schib);
+}
+
+static int css_evaluate_known_subchannel(struct subchannel *sch, int slow)
+{
+	int ret = 0;
+
+	if (sch->driver) {
+		if (sch->driver->sch_event)
+			ret = sch->driver->sch_event(sch, slow);
+		else
+			dev_dbg(&sch->dev,
+				"Got subchannel machine check but "
+				"no sch_event handler provided.\n");
+	}
+	if (ret != 0 && ret != -EAGAIN) {
+		CIO_MSG_EVENT(2, "eval: sch 0.%x.%04x, rc=%d\n",
+			      sch->schid.ssid, sch->schid.sch_no, ret);
+	}
+	return ret;
+}
+
+static void css_evaluate_subchannel(struct subchannel_id schid, int slow)
+{
+	struct subchannel *sch;
+	int ret;
+
+	sch = get_subchannel_by_schid(schid);
+	if (sch) {
+		ret = css_evaluate_known_subchannel(sch, slow);
+		put_device(&sch->dev);
+	} else
+		ret = css_evaluate_new_subchannel(schid, slow);
+	if (ret == -EAGAIN)
+		css_schedule_eval(schid);
+}
+
+/**
+ * css_sched_sch_todo - schedule a subchannel operation
+ * @sch: subchannel
+ * @todo: todo
+ *
+ * Schedule the operation identified by @todo to be performed on the slow path
+ * workqueue. Do nothing if another operation with higher priority is already
+ * scheduled. Needs to be called with subchannel lock held.
+ */
+void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo)
+{
+	CIO_MSG_EVENT(4, "sch_todo: sched sch=0.%x.%04x todo=%d\n",
+		      sch->schid.ssid, sch->schid.sch_no, todo);
+	if (sch->todo >= todo)
+		return;
+	/* Get workqueue ref. */
+	if (!get_device(&sch->dev))
+		return;
+	sch->todo = todo;
+	if (!queue_work(cio_work_q, &sch->todo_work)) {
+		/* Already queued, release workqueue ref. */
+		put_device(&sch->dev);
+	}
+}
+EXPORT_SYMBOL_GPL(css_sched_sch_todo);
+
+static void css_sch_todo(struct work_struct *work)
+{
+	struct subchannel *sch;
+	enum sch_todo todo;
+	int ret;
+
+	sch = container_of(work, struct subchannel, todo_work);
+	/* Find out todo. */
+	spin_lock_irq(sch->lock);
+	todo = sch->todo;
+	CIO_MSG_EVENT(4, "sch_todo: sch=0.%x.%04x, todo=%d\n", sch->schid.ssid,
+		      sch->schid.sch_no, todo);
+	sch->todo = SCH_TODO_NOTHING;
+	spin_unlock_irq(sch->lock);
+	/* Perform todo. */
+	switch (todo) {
+	case SCH_TODO_NOTHING:
+		break;
+	case SCH_TODO_EVAL:
+		ret = css_evaluate_known_subchannel(sch, 1);
+		if (ret == -EAGAIN) {
+			spin_lock_irq(sch->lock);
+			css_sched_sch_todo(sch, todo);
+			spin_unlock_irq(sch->lock);
+		}
+		break;
+	case SCH_TODO_UNREG:
+		css_sch_device_unregister(sch);
+		break;
+	}
+	/* Release workqueue ref. */
+	put_device(&sch->dev);
+}
+
+static struct idset *slow_subchannel_set;
+static DEFINE_SPINLOCK(slow_subchannel_lock);
+static DECLARE_WAIT_QUEUE_HEAD(css_eval_wq);
+static atomic_t css_eval_scheduled;
+
+static int __init slow_subchannel_init(void)
+{
+	atomic_set(&css_eval_scheduled, 0);
+	slow_subchannel_set = idset_sch_new();
+	if (!slow_subchannel_set) {
+		CIO_MSG_EVENT(0, "could not allocate slow subchannel set\n");
+		return -ENOMEM;
+	}
+	return 0;
+}
+
+static int slow_eval_known_fn(struct subchannel *sch, void *data)
+{
+	int eval;
+	int rc;
+
+	spin_lock_irq(&slow_subchannel_lock);
+	eval = idset_sch_contains(slow_subchannel_set, sch->schid);
+	idset_sch_del(slow_subchannel_set, sch->schid);
+	spin_unlock_irq(&slow_subchannel_lock);
+	if (eval) {
+		rc = css_evaluate_known_subchannel(sch, 1);
+		if (rc == -EAGAIN)
+			css_schedule_eval(sch->schid);
+		/*
+		 * The loop might take long time for platforms with lots of
+		 * known devices. Allow scheduling here.
+		 */
+		cond_resched();
+	}
+	return 0;
+}
+
+static int slow_eval_unknown_fn(struct subchannel_id schid, void *data)
+{
+	int eval;
+	int rc = 0;
+
+	spin_lock_irq(&slow_subchannel_lock);
+	eval = idset_sch_contains(slow_subchannel_set, schid);
+	idset_sch_del(slow_subchannel_set, schid);
+	spin_unlock_irq(&slow_subchannel_lock);
+	if (eval) {
+		rc = css_evaluate_new_subchannel(schid, 1);
+		switch (rc) {
+		case -EAGAIN:
+			css_schedule_eval(schid);
+			rc = 0;
+			break;
+		case -ENXIO:
+		case -ENOMEM:
+		case -EIO:
+			/* These should abort looping */
+			spin_lock_irq(&slow_subchannel_lock);
+			idset_sch_del_subseq(slow_subchannel_set, schid);
+			spin_unlock_irq(&slow_subchannel_lock);
+			break;
+		default:
+			rc = 0;
+		}
+		/* Allow scheduling here since the containing loop might
+		 * take a while.  */
+		cond_resched();
+	}
+	return rc;
+}
+
+static void css_slow_path_func(struct work_struct *unused)
+{
+	unsigned long flags;
+
+	CIO_TRACE_EVENT(4, "slowpath");
+	for_each_subchannel_staged(slow_eval_known_fn, slow_eval_unknown_fn,
+				   NULL);
+	spin_lock_irqsave(&slow_subchannel_lock, flags);
+	if (idset_is_empty(slow_subchannel_set)) {
+		atomic_set(&css_eval_scheduled, 0);
+		wake_up(&css_eval_wq);
+	}
+	spin_unlock_irqrestore(&slow_subchannel_lock, flags);
+}
+
+static DECLARE_DELAYED_WORK(slow_path_work, css_slow_path_func);
+struct workqueue_struct *cio_work_q;
+
+void css_schedule_eval(struct subchannel_id schid)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&slow_subchannel_lock, flags);
+	idset_sch_add(slow_subchannel_set, schid);
+	atomic_set(&css_eval_scheduled, 1);
+	queue_delayed_work(cio_work_q, &slow_path_work, 0);
+	spin_unlock_irqrestore(&slow_subchannel_lock, flags);
+}
+
+void css_schedule_eval_all(void)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&slow_subchannel_lock, flags);
+	idset_fill(slow_subchannel_set);
+	atomic_set(&css_eval_scheduled, 1);
+	queue_delayed_work(cio_work_q, &slow_path_work, 0);
+	spin_unlock_irqrestore(&slow_subchannel_lock, flags);
+}
+
+static int __unset_validpath(struct device *dev, void *data)
+{
+	struct idset *set = data;
+	struct subchannel *sch = to_subchannel(dev);
+	struct pmcw *pmcw = &sch->schib.pmcw;
+
+	/* Here we want to make sure that we are considering only those subchannels
+	 * which do not have an operational device attached to it. This can be found
+	 * with the help of PAM and POM values of pmcw. OPM provides the information
+	 * about any path which is currently vary-off, so that we should not consider.
+	 */
+	if (sch->st == SUBCHANNEL_TYPE_IO &&
+	    (sch->opm & pmcw->pam & pmcw->pom))
+		idset_sch_del(set, sch->schid);
+
+	return 0;
+}
+
+static int __unset_online(struct device *dev, void *data)
+{
+	struct idset *set = data;
+	struct subchannel *sch = to_subchannel(dev);
+
+	if (sch->st == SUBCHANNEL_TYPE_IO && sch->config.ena)
+		idset_sch_del(set, sch->schid);
+
+	return 0;
+}
+
+void css_schedule_eval_cond(enum css_eval_cond cond, unsigned long delay)
+{
+	unsigned long flags;
+	struct idset *set;
+
+	/* Find unregistered subchannels. */
+	set = idset_sch_new();
+	if (!set) {
+		/* Fallback. */
+		css_schedule_eval_all();
+		return;
+	}
+	idset_fill(set);
+	switch (cond) {
+	case CSS_EVAL_NO_PATH:
+		bus_for_each_dev(&css_bus_type, NULL, set, __unset_validpath);
+		break;
+	case CSS_EVAL_NOT_ONLINE:
+		bus_for_each_dev(&css_bus_type, NULL, set, __unset_online);
+		break;
+	default:
+		break;
+	}
+
+	/* Apply to slow_subchannel_set. */
+	spin_lock_irqsave(&slow_subchannel_lock, flags);
+	idset_add_set(slow_subchannel_set, set);
+	atomic_set(&css_eval_scheduled, 1);
+	queue_delayed_work(cio_work_q, &slow_path_work, delay);
+	spin_unlock_irqrestore(&slow_subchannel_lock, flags);
+	idset_free(set);
+}
+
+void css_wait_for_slow_path(void)
+{
+	flush_workqueue(cio_work_q);
+}
+
+/* Schedule reprobing of all subchannels with no valid operational path. */
+void css_schedule_reprobe(void)
+{
+	/* Schedule with a delay to allow merging of subsequent calls. */
+	css_schedule_eval_cond(CSS_EVAL_NO_PATH, 1 * HZ);
+}
+EXPORT_SYMBOL_GPL(css_schedule_reprobe);
+
+/*
+ * Called from the machine check handler for subchannel report words.
+ */
+static void css_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
+{
+	struct subchannel_id mchk_schid;
+	struct subchannel *sch;
+
+	if (overflow) {
+		css_schedule_eval_all();
+		return;
+	}
+	CIO_CRW_EVENT(2, "CRW0 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);
+	if (crw1)
+		CIO_CRW_EVENT(2, "CRW1 reports slct=%d, oflw=%d, "
+			      "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
+			      crw1->slct, crw1->oflw, crw1->chn, crw1->rsc,
+			      crw1->anc, crw1->erc, crw1->rsid);
+	init_subchannel_id(&mchk_schid);
+	mchk_schid.sch_no = crw0->rsid;
+	if (crw1)
+		mchk_schid.ssid = (crw1->rsid >> 4) & 3;
+
+	if (crw0->erc == CRW_ERC_PMOD) {
+		sch = get_subchannel_by_schid(mchk_schid);
+		if (sch) {
+			css_update_ssd_info(sch);
+			put_device(&sch->dev);
+		}
+	}
+	/*
+	 * Since we are always presented with IPI in the CRW, we have to
+	 * use stsch() to find out if the subchannel in question has come
+	 * or gone.
+	 */
+	css_evaluate_subchannel(mchk_schid, 0);
+}
+
+static void __init
+css_generate_pgid(struct channel_subsystem *css, u32 tod_high)
+{
+	struct cpuid cpu_id;
+
+	if (css_general_characteristics.mcss) {
+		css->global_pgid.pgid_high.ext_cssid.version = 0x80;
+		css->global_pgid.pgid_high.ext_cssid.cssid =
+			css->id_valid ? css->cssid : 0;
+	} else {
+		css->global_pgid.pgid_high.cpu_addr = stap();
+	}
+	get_cpu_id(&cpu_id);
+	css->global_pgid.cpu_id = cpu_id.ident;
+	css->global_pgid.cpu_model = cpu_id.machine;
+	css->global_pgid.tod_high = tod_high;
+}
+
+static void channel_subsystem_release(struct device *dev)
+{
+	struct channel_subsystem *css = to_css(dev);
+
+	mutex_destroy(&css->mutex);
+	kfree(css);
+}
+
+static ssize_t real_cssid_show(struct device *dev, struct device_attribute *a,
+			       char *buf)
+{
+	struct channel_subsystem *css = to_css(dev);
+
+	if (!css->id_valid)
+		return -EINVAL;
+
+	return sprintf(buf, "%x\n", css->cssid);
+}
+static DEVICE_ATTR_RO(real_cssid);
+
+static ssize_t rescan_store(struct device *dev, struct device_attribute *a,
+			    const char *buf, size_t count)
+{
+	CIO_TRACE_EVENT(4, "usr-rescan");
+
+	css_schedule_eval_all();
+	css_complete_work();
+
+	return count;
+}
+static DEVICE_ATTR_WO(rescan);
+
+static ssize_t cm_enable_show(struct device *dev, struct device_attribute *a,
+			      char *buf)
+{
+	struct channel_subsystem *css = to_css(dev);
+	int ret;
+
+	mutex_lock(&css->mutex);
+	ret = sprintf(buf, "%x\n", css->cm_enabled);
+	mutex_unlock(&css->mutex);
+	return ret;
+}
+
+static ssize_t cm_enable_store(struct device *dev, struct device_attribute *a,
+			       const char *buf, size_t count)
+{
+	struct channel_subsystem *css = to_css(dev);
+	unsigned long val;
+	int ret;
+
+	ret = kstrtoul(buf, 16, &val);
+	if (ret)
+		return ret;
+	mutex_lock(&css->mutex);
+	switch (val) {
+	case 0:
+		ret = css->cm_enabled ? chsc_secm(css, 0) : 0;
+		break;
+	case 1:
+		ret = css->cm_enabled ? 0 : chsc_secm(css, 1);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+	mutex_unlock(&css->mutex);
+	return ret < 0 ? ret : count;
+}
+static DEVICE_ATTR_RW(cm_enable);
+
+static umode_t cm_enable_mode(struct kobject *kobj, struct attribute *attr,
+			      int index)
+{
+	return css_chsc_characteristics.secm ? attr->mode : 0;
+}
+
+static struct attribute *cssdev_attrs[] = {
+	&dev_attr_real_cssid.attr,
+	&dev_attr_rescan.attr,
+	NULL,
+};
+
+static struct attribute_group cssdev_attr_group = {
+	.attrs = cssdev_attrs,
+};
+
+static struct attribute *cssdev_cm_attrs[] = {
+	&dev_attr_cm_enable.attr,
+	NULL,
+};
+
+static struct attribute_group cssdev_cm_attr_group = {
+	.attrs = cssdev_cm_attrs,
+	.is_visible = cm_enable_mode,
+};
+
+static const struct attribute_group *cssdev_attr_groups[] = {
+	&cssdev_attr_group,
+	&cssdev_cm_attr_group,
+	NULL,
+};
+
+static int __init setup_css(int nr)
+{
+	struct channel_subsystem *css;
+	int ret;
+
+	css = kzalloc(sizeof(*css), GFP_KERNEL);
+	if (!css)
+		return -ENOMEM;
+
+	channel_subsystems[nr] = css;
+	dev_set_name(&css->device, "css%x", nr);
+	css->device.groups = cssdev_attr_groups;
+	css->device.release = channel_subsystem_release;
+	/*
+	 * We currently allocate notifier bits with this (using
+	 * css->device as the device argument with the DMA API)
+	 * and are fine with 64 bit addresses.
+	 */
+	ret = dma_coerce_mask_and_coherent(&css->device, DMA_BIT_MASK(64));
+	if (ret) {
+		kfree(css);
+		goto out_err;
+	}
+
+	mutex_init(&css->mutex);
+	ret = chsc_get_cssid_iid(nr, &css->cssid, &css->iid);
+	if (!ret) {
+		css->id_valid = true;
+		pr_info("Partition identifier %01x.%01x\n", css->cssid,
+			css->iid);
+	}
+	css_generate_pgid(css, (u32) (get_tod_clock() >> 32));
+
+	ret = device_register(&css->device);
+	if (ret) {
+		put_device(&css->device);
+		goto out_err;
+	}
+
+	css->pseudo_subchannel = kzalloc(sizeof(*css->pseudo_subchannel),
+					 GFP_KERNEL);
+	if (!css->pseudo_subchannel) {
+		device_unregister(&css->device);
+		ret = -ENOMEM;
+		goto out_err;
+	}
+
+	css->pseudo_subchannel->dev.parent = &css->device;
+	css->pseudo_subchannel->dev.release = css_subchannel_release;
+	mutex_init(&css->pseudo_subchannel->reg_mutex);
+	ret = css_sch_create_locks(css->pseudo_subchannel);
+	if (ret) {
+		kfree(css->pseudo_subchannel);
+		device_unregister(&css->device);
+		goto out_err;
+	}
+
+	dev_set_name(&css->pseudo_subchannel->dev, "defunct");
+	ret = device_register(&css->pseudo_subchannel->dev);
+	if (ret) {
+		put_device(&css->pseudo_subchannel->dev);
+		device_unregister(&css->device);
+		goto out_err;
+	}
+
+	return ret;
+out_err:
+	channel_subsystems[nr] = NULL;
+	return ret;
+}
+
+static int css_reboot_event(struct notifier_block *this,
+			    unsigned long event,
+			    void *ptr)
+{
+	struct channel_subsystem *css;
+	int ret;
+
+	ret = NOTIFY_DONE;
+	for_each_css(css) {
+		mutex_lock(&css->mutex);
+		if (css->cm_enabled)
+			if (chsc_secm(css, 0))
+				ret = NOTIFY_BAD;
+		mutex_unlock(&css->mutex);
+	}
+
+	return ret;
+}
+
+static struct notifier_block css_reboot_notifier = {
+	.notifier_call = css_reboot_event,
+};
+
+#define  CIO_DMA_GFP (GFP_KERNEL | __GFP_ZERO)
+static struct gen_pool *cio_dma_pool;
+
+/* Currently cio supports only a single css */
+struct device *cio_get_dma_css_dev(void)
+{
+	return &channel_subsystems[0]->device;
+}
+
+struct gen_pool *cio_gp_dma_create(struct device *dma_dev, int nr_pages)
+{
+	struct gen_pool *gp_dma;
+	void *cpu_addr;
+	dma_addr_t dma_addr;
+	int i;
+
+	gp_dma = gen_pool_create(3, -1);
+	if (!gp_dma)
+		return NULL;
+	for (i = 0; i < nr_pages; ++i) {
+		cpu_addr = dma_alloc_coherent(dma_dev, PAGE_SIZE, &dma_addr,
+					      CIO_DMA_GFP);
+		if (!cpu_addr)
+			return gp_dma;
+		gen_pool_add_virt(gp_dma, (unsigned long) cpu_addr,
+				  dma_addr, PAGE_SIZE, -1);
+	}
+	return gp_dma;
+}
+
+static void __gp_dma_free_dma(struct gen_pool *pool,
+			      struct gen_pool_chunk *chunk, void *data)
+{
+	size_t chunk_size = chunk->end_addr - chunk->start_addr + 1;
+
+	dma_free_coherent((struct device *) data, chunk_size,
+			 (void *) chunk->start_addr,
+			 (dma_addr_t) chunk->phys_addr);
+}
+
+void cio_gp_dma_destroy(struct gen_pool *gp_dma, struct device *dma_dev)
+{
+	if (!gp_dma)
+		return;
+	/* this is quite ugly but no better idea */
+	gen_pool_for_each_chunk(gp_dma, __gp_dma_free_dma, dma_dev);
+	gen_pool_destroy(gp_dma);
+}
+
+static int cio_dma_pool_init(void)
+{
+	/* No need to free up the resources: compiled in */
+	cio_dma_pool = cio_gp_dma_create(cio_get_dma_css_dev(), 1);
+	if (!cio_dma_pool)
+		return -ENOMEM;
+	return 0;
+}
+
+void *cio_gp_dma_zalloc(struct gen_pool *gp_dma, struct device *dma_dev,
+			size_t size)
+{
+	dma_addr_t dma_addr;
+	unsigned long addr;
+	size_t chunk_size;
+
+	if (!gp_dma)
+		return NULL;
+	addr = gen_pool_alloc(gp_dma, size);
+	while (!addr) {
+		chunk_size = round_up(size, PAGE_SIZE);
+		addr = (unsigned long) dma_alloc_coherent(dma_dev,
+					 chunk_size, &dma_addr, CIO_DMA_GFP);
+		if (!addr)
+			return NULL;
+		gen_pool_add_virt(gp_dma, addr, dma_addr, chunk_size, -1);
+		addr = gen_pool_alloc(gp_dma, size);
+	}
+	return (void *) addr;
+}
+
+void cio_gp_dma_free(struct gen_pool *gp_dma, void *cpu_addr, size_t size)
+{
+	if (!cpu_addr)
+		return;
+	memset(cpu_addr, 0, size);
+	gen_pool_free(gp_dma, (unsigned long) cpu_addr, size);
+}
+
+/*
+ * Allocate dma memory from the css global pool. Intended for memory not
+ * specific to any single device within the css. The allocated memory
+ * is not guaranteed to be 31-bit addressable.
+ *
+ * Caution: Not suitable for early stuff like console.
+ */
+void *cio_dma_zalloc(size_t size)
+{
+	return cio_gp_dma_zalloc(cio_dma_pool, cio_get_dma_css_dev(), size);
+}
+
+void cio_dma_free(void *cpu_addr, size_t size)
+{
+	cio_gp_dma_free(cio_dma_pool, cpu_addr, size);
+}
+
+/*
+ * Now that the driver core is running, we can setup our channel subsystem.
+ * The struct subchannel's are created during probing.
+ */
+static int __init css_bus_init(void)
+{
+	int ret, i;
+
+	ret = chsc_init();
+	if (ret)
+		return ret;
+
+	chsc_determine_css_characteristics();
+	/* Try to enable MSS. */
+	ret = chsc_enable_facility(CHSC_SDA_OC_MSS);
+	if (ret)
+		max_ssid = 0;
+	else /* Success. */
+		max_ssid = __MAX_SSID;
+
+	ret = slow_subchannel_init();
+	if (ret)
+		goto out;
+
+	ret = crw_register_handler(CRW_RSC_SCH, css_process_crw);
+	if (ret)
+		goto out;
+
+	if ((ret = bus_register(&css_bus_type)))
+		goto out;
+
+	/* Setup css structure. */
+	for (i = 0; i <= MAX_CSS_IDX; i++) {
+		ret = setup_css(i);
+		if (ret)
+			goto out_unregister;
+	}
+	ret = register_reboot_notifier(&css_reboot_notifier);
+	if (ret)
+		goto out_unregister;
+	ret = cio_dma_pool_init();
+	if (ret)
+		goto out_unregister_rn;
+	airq_init();
+	css_init_done = 1;
+
+	/* Enable default isc for I/O subchannels. */
+	isc_register(IO_SCH_ISC);
+
+	return 0;
+out_unregister_rn:
+	unregister_reboot_notifier(&css_reboot_notifier);
+out_unregister:
+	while (i-- > 0) {
+		struct channel_subsystem *css = channel_subsystems[i];
+		device_unregister(&css->pseudo_subchannel->dev);
+		device_unregister(&css->device);
+	}
+	bus_unregister(&css_bus_type);
+out:
+	crw_unregister_handler(CRW_RSC_SCH);
+	idset_free(slow_subchannel_set);
+	chsc_init_cleanup();
+	pr_alert("The CSS device driver initialization failed with "
+		 "errno=%d\n", ret);
+	return ret;
+}
+
+static void __init css_bus_cleanup(void)
+{
+	struct channel_subsystem *css;
+
+	for_each_css(css) {
+		device_unregister(&css->pseudo_subchannel->dev);
+		device_unregister(&css->device);
+	}
+	bus_unregister(&css_bus_type);
+	crw_unregister_handler(CRW_RSC_SCH);
+	idset_free(slow_subchannel_set);
+	chsc_init_cleanup();
+	isc_unregister(IO_SCH_ISC);
+}
+
+static int __init channel_subsystem_init(void)
+{
+	int ret;
+
+	ret = css_bus_init();
+	if (ret)
+		return ret;
+	cio_work_q = create_singlethread_workqueue("cio");
+	if (!cio_work_q) {
+		ret = -ENOMEM;
+		goto out_bus;
+	}
+	ret = io_subchannel_init();
+	if (ret)
+		goto out_wq;
+
+	/* Register subchannels which are already in use. */
+	cio_register_early_subchannels();
+	/* Start initial subchannel evaluation. */
+	css_schedule_eval_all();
+
+	return ret;
+out_wq:
+	destroy_workqueue(cio_work_q);
+out_bus:
+	css_bus_cleanup();
+	return ret;
+}
+subsys_initcall(channel_subsystem_init);
+
+static int css_settle(struct device_driver *drv, void *unused)
+{
+	struct css_driver *cssdrv = to_cssdriver(drv);
+
+	if (cssdrv->settle)
+		return cssdrv->settle();
+	return 0;
+}
+
+int css_complete_work(void)
+{
+	int ret;
+
+	/* Wait for the evaluation of subchannels to finish. */
+	ret = wait_event_interruptible(css_eval_wq,
+				       atomic_read(&css_eval_scheduled) == 0);
+	if (ret)
+		return -EINTR;
+	flush_workqueue(cio_work_q);
+	/* Wait for the subchannel type specific initialization to finish */
+	return bus_for_each_drv(&css_bus_type, NULL, NULL, css_settle);
+}
+
+
+/*
+ * Wait for the initialization of devices to finish, to make sure we are
+ * done with our setup if the search for the root device starts.
+ */
+static int __init channel_subsystem_init_sync(void)
+{
+	css_complete_work();
+	return 0;
+}
+subsys_initcall_sync(channel_subsystem_init_sync);
+
+#ifdef CONFIG_PROC_FS
+static ssize_t cio_settle_write(struct file *file, const char __user *buf,
+				size_t count, loff_t *ppos)
+{
+	int ret;
+
+	/* Handle pending CRW's. */
+	crw_wait_for_channel_report();
+	ret = css_complete_work();
+
+	return ret ? ret : count;
+}
+
+static const struct proc_ops cio_settle_proc_ops = {
+	.proc_open	= nonseekable_open,
+	.proc_write	= cio_settle_write,
+	.proc_lseek	= no_llseek,
+};
+
+static int __init cio_settle_init(void)
+{
+	struct proc_dir_entry *entry;
+
+	entry = proc_create("cio_settle", S_IWUSR, NULL, &cio_settle_proc_ops);
+	if (!entry)
+		return -ENOMEM;
+	return 0;
+}
+device_initcall(cio_settle_init);
+#endif /*CONFIG_PROC_FS*/
+
+int sch_is_pseudo_sch(struct subchannel *sch)
+{
+	if (!sch->dev.parent)
+		return 0;
+	return sch == to_css(sch->dev.parent)->pseudo_subchannel;
+}
+
+static int css_bus_match(struct device *dev, struct device_driver *drv)
+{
+	struct subchannel *sch = to_subchannel(dev);
+	struct css_driver *driver = to_cssdriver(drv);
+	struct css_device_id *id;
+
+	/* When driver_override is set, only bind to the matching driver */
+	if (sch->driver_override && strcmp(sch->driver_override, drv->name))
+		return 0;
+
+	for (id = driver->subchannel_type; id->match_flags; id++) {
+		if (sch->st == id->type)
+			return 1;
+	}
+
+	return 0;
+}
+
+static int css_probe(struct device *dev)
+{
+	struct subchannel *sch;
+	int ret;
+
+	sch = to_subchannel(dev);
+	sch->driver = to_cssdriver(dev->driver);
+	ret = sch->driver->probe ? sch->driver->probe(sch) : 0;
+	if (ret)
+		sch->driver = NULL;
+	return ret;
+}
+
+static void css_remove(struct device *dev)
+{
+	struct subchannel *sch;
+
+	sch = to_subchannel(dev);
+	if (sch->driver->remove)
+		sch->driver->remove(sch);
+	sch->driver = NULL;
+}
+
+static void css_shutdown(struct device *dev)
+{
+	struct subchannel *sch;
+
+	sch = to_subchannel(dev);
+	if (sch->driver && sch->driver->shutdown)
+		sch->driver->shutdown(sch);
+}
+
+static int css_uevent(const struct device *dev, struct kobj_uevent_env *env)
+{
+	const struct subchannel *sch = to_subchannel(dev);
+	int ret;
+
+	ret = add_uevent_var(env, "ST=%01X", sch->st);
+	if (ret)
+		return ret;
+	ret = add_uevent_var(env, "MODALIAS=css:t%01X", sch->st);
+	return ret;
+}
+
+static struct bus_type css_bus_type = {
+	.name     = "css",
+	.match    = css_bus_match,
+	.probe    = css_probe,
+	.remove   = css_remove,
+	.shutdown = css_shutdown,
+	.uevent   = css_uevent,
+};
+
+/**
+ * css_driver_register - register a css driver
+ * @cdrv: css driver to register
+ *
+ * This is mainly a wrapper around driver_register that sets name
+ * and bus_type in the embedded struct device_driver correctly.
+ */
+int css_driver_register(struct css_driver *cdrv)
+{
+	cdrv->drv.bus = &css_bus_type;
+	return driver_register(&cdrv->drv);
+}
+EXPORT_SYMBOL_GPL(css_driver_register);
+
+/**
+ * css_driver_unregister - unregister a css driver
+ * @cdrv: css driver to unregister
+ *
+ * This is a wrapper around driver_unregister.
+ */
+void css_driver_unregister(struct css_driver *cdrv)
+{
+	driver_unregister(&cdrv->drv);
+}
+EXPORT_SYMBOL_GPL(css_driver_unregister);