X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Fs390%2Fcio%2Fcss.c;h=74ea8aac4b7d9683c37ce79e79a41edf673b9d07;hb=43bc926fffd92024b46cafaf7350d669ba9ca884;hp=ffad52007cfca0bfd7638fddff1602c2e408ce33;hpb=5273a3df6485dc2ad6aa7ddd441b9a21970f003b;p=linux-2.6.git

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index ffad52007..74ea8aac4 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -1,12 +1,11 @@
 /*
  *  drivers/s390/cio/css.c
  *  driver for channel subsystem
- *   $Revision: 1.73 $
  *
  *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
  *			 IBM Corporation
  *    Author(s): Arnd Bergmann (arndb@de.ibm.com)
- *		 Cornelia Huck (cohuck@de.ibm.com)
+ *		 Cornelia Huck (cornelia.huck@de.ibm.com)
  */
 #include <linux/module.h>
 #include <linux/init.h>
@@ -19,17 +18,37 @@
 #include "cio.h"
 #include "cio_debug.h"
 #include "ioasm.h"
+#include "chsc.h"
 
-unsigned int highest_subchannel;
 int need_rescan = 0;
 int css_init_done = 0;
+static int max_ssid = 0;
 
-struct device css_bus_device = {
-	.bus_id = "css0",
-};
+struct channel_subsystem *css[__MAX_CSSID + 1];
+
+int css_characteristics_avail = 0;
+
+inline int
+for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data)
+{
+	struct subchannel_id schid;
+	int ret;
+
+	init_subchannel_id(&schid);
+	ret = -ENODEV;
+	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;
+}
 
 static struct subchannel *
-css_alloc_subchannel(int irq)
+css_alloc_subchannel(struct subchannel_id schid)
 {
 	struct subchannel *sch;
 	int ret;
@@ -37,13 +56,11 @@ css_alloc_subchannel(int irq)
 	sch = kmalloc (sizeof (*sch), GFP_KERNEL | GFP_DMA);
 	if (sch == NULL)
 		return ERR_PTR(-ENOMEM);
-	ret = cio_validate_subchannel (sch, irq);
+	ret = cio_validate_subchannel (sch, schid);
 	if (ret < 0) {
 		kfree(sch);
 		return ERR_PTR(ret);
 	}
-	if (irq > highest_subchannel)
-		highest_subchannel = irq;
 
 	if (sch->st != SUBCHANNEL_TYPE_IO) {
 		/* For now we ignore all non-io subchannels. */
@@ -83,7 +100,7 @@ css_subchannel_release(struct device *dev)
 	struct subchannel *sch;
 
 	sch = to_subchannel(dev);
-	if (!cio_is_console(sch->irq))
+	if (!cio_is_console(sch->schid))
 		kfree(sch);
 }
 
@@ -95,7 +112,7 @@ css_register_subchannel(struct subchannel *sch)
 	int ret;
 
 	/* Initialize the subchannel structure */
-	sch->dev.parent = &css_bus_device;
+	sch->dev.parent = &css[0]->device;
 	sch->dev.bus = &css_bus_type;
 	sch->dev.release = &css_subchannel_release;
 	
@@ -110,12 +127,12 @@ css_register_subchannel(struct subchannel *sch)
 }
 
 int
-css_probe_device(int irq)
+css_probe_device(struct subchannel_id schid)
 {
 	int ret;
 	struct subchannel *sch;
 
-	sch = css_alloc_subchannel(irq);
+	sch = css_alloc_subchannel(schid);
 	if (IS_ERR(sch))
 		return PTR_ERR(sch);
 	ret = css_register_subchannel(sch);
@@ -124,36 +141,30 @@ css_probe_device(int irq)
 	return ret;
 }
 
-struct subchannel *
-get_subchannel_by_schid(int irq)
+static int
+check_subchannel(struct device * dev, void * data)
 {
 	struct subchannel *sch;
-	struct list_head *entry;
+	struct subchannel_id *schid = data;
+
+	sch = to_subchannel(dev);
+	return schid_equal(&sch->schid, schid);
+}
+
+struct subchannel *
+get_subchannel_by_schid(struct subchannel_id schid)
+{
 	struct device *dev;
 
-	if (!get_bus(&css_bus_type))
-		return NULL;
-	down_read(&css_bus_type.subsys.rwsem);
-	sch = NULL;
-	list_for_each(entry, &css_bus_type.devices.list) {
-		dev = get_device(container_of(entry,
-					      struct device, bus_list));
-		if (!dev)
-			continue;
-		sch = to_subchannel(dev);
-		if (sch->irq == irq)
-			break;
-		put_device(dev);
-		sch = NULL;
-	}
-	up_read(&css_bus_type.subsys.rwsem);
-	put_bus(&css_bus_type);
+	dev = bus_find_device(&css_bus_type, NULL,
+			      (void *)&schid, check_subchannel);
 
-	return sch;
+	return dev ? to_subchannel(dev) : NULL;
 }
 
+
 static inline int
-css_get_subchannel_status(struct subchannel *sch, int schid)
+css_get_subchannel_status(struct subchannel *sch, struct subchannel_id schid)
 {
 	struct schib schib;
 	int cc;
@@ -166,37 +177,68 @@ css_get_subchannel_status(struct subchannel *sch, int schid)
 	if (sch && sch->schib.pmcw.dnv &&
 	    (schib.pmcw.dev != sch->schib.pmcw.dev))
 		return CIO_REVALIDATE;
+	if (sch && !sch->lpm)
+		return CIO_NO_PATH;
 	return CIO_OPER;
 }
 	
-static inline int
-css_evaluate_subchannel(int irq, int slow)
+static int
+css_evaluate_subchannel(struct subchannel_id schid, int slow)
 {
 	int event, ret, disc;
 	struct subchannel *sch;
+	unsigned long flags;
 
-	sch = get_subchannel_by_schid(irq);
+	sch = get_subchannel_by_schid(schid);
 	disc = sch ? device_is_disconnected(sch) : 0;
 	if (disc && slow) {
 		if (sch)
 			put_device(&sch->dev);
 		return 0; /* Already processed. */
 	}
+	/*
+	 * We've got a machine check, so running I/O won't get an interrupt.
+	 * Kill any pending timers.
+	 */
+	if (sch)
+		device_kill_pending_timer(sch);
 	if (!disc && !slow) {
 		if (sch)
 			put_device(&sch->dev);
 		return -EAGAIN; /* Will be done on the slow path. */
 	}
-	event = css_get_subchannel_status(sch, irq);
+	event = css_get_subchannel_status(sch, schid);
+	CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n",
+		      schid.ssid, schid.sch_no, event,
+		      sch?(disc?"disconnected":"normal"):"unknown",
+		      slow?"slow":"fast");
 	switch (event) {
+	case CIO_NO_PATH:
 	case CIO_GONE:
 		if (!sch) {
 			/* Never used this subchannel. Ignore. */
 			ret = 0;
 			break;
 		}
+		if (disc && (event == CIO_NO_PATH)) {
+			/*
+			 * Uargh, hack again. Because we don't get a machine
+			 * check on configure on, our path bookkeeping can
+			 * be out of date here (it's fine while we only do
+			 * logical varying or get chsc machine checks). We
+			 * need to force reprobing or we might miss devices
+			 * coming operational again. It won't do harm in real
+			 * no path situations.
+			 */
+			spin_lock_irqsave(&sch->lock, flags);
+			device_trigger_reprobe(sch);
+			spin_unlock_irqrestore(&sch->lock, flags);
+			ret = 0;
+			break;
+		}
 		if (sch->driver && sch->driver->notify &&
-		    sch->driver->notify(&sch->dev, CIO_GONE)) {
+		    sch->driver->notify(&sch->dev, event)) {
+			cio_disable_subchannel(sch);
 			device_set_disconnected(sch);
 			ret = 0;
 			break;
@@ -205,6 +247,7 @@ css_evaluate_subchannel(int irq, int slow)
 		 * Unregister subchannel.
 		 * The device will be killed automatically.
 		 */
+		cio_disable_subchannel(sch);
 		device_unregister(&sch->dev);
 		/* Reset intparm to zeroes. */
 		sch->schib.pmcw.intparm = 0;
@@ -218,18 +261,32 @@ css_evaluate_subchannel(int irq, int slow)
 		 * We don't notify the driver since we have to throw the device
 		 * away in any case.
 		 */
-		device_unregister(&sch->dev);
-		/* Reset intparm to zeroes. */
-		sch->schib.pmcw.intparm = 0;
-		cio_modify(sch);
-		put_device(&sch->dev);
-		ret = css_probe_device(irq);
+		if (!disc) {
+			device_unregister(&sch->dev);
+			/* Reset intparm to zeroes. */
+			sch->schib.pmcw.intparm = 0;
+			cio_modify(sch);
+			put_device(&sch->dev);
+			ret = css_probe_device(schid);
+		} else {
+			/*
+			 * We can't immediately deregister the disconnected
+			 * device since it might block.
+			 */
+			spin_lock_irqsave(&sch->lock, flags);
+			device_trigger_reprobe(sch);
+			spin_unlock_irqrestore(&sch->lock, flags);
+			ret = 0;
+		}
 		break;
 	case CIO_OPER:
-		if (disc)
+		if (disc) {
+			spin_lock_irqsave(&sch->lock, flags);
 			/* Get device operational again. */
 			device_trigger_reprobe(sch);
-		ret = sch ? 0 : css_probe_device(irq);
+			spin_unlock_irqrestore(&sch->lock, flags);
+		}
+		ret = sch ? 0 : css_probe_device(schid);
 		break;
 	default:
 		BUG();
@@ -238,42 +295,50 @@ css_evaluate_subchannel(int irq, int slow)
 	return ret;
 }
 
-static void
-css_rescan_devices(void)
+static int
+css_rescan_devices(struct subchannel_id schid, void *data)
 {
-	int irq, ret;
-
-	for (irq = 0; irq <= __MAX_SUBCHANNELS; irq++) {
-		ret = css_evaluate_subchannel(irq, 1);
-		/* No more memory. It doesn't make sense to continue. No
-		 * panic because this can happen in midflight and just
-		 * because we can't use a new device is no reason to crash
-		 * the system. */
-		if (ret == -ENOMEM)
-			break;
-		/* -ENXIO indicates that there are no more subchannels. */
-		if (ret == -ENXIO)
-			break;
-	}
+	return css_evaluate_subchannel(schid, 1);
 }
 
-static void
-css_evaluate_slow_subchannel(unsigned long schid)
-{
-	css_evaluate_subchannel(schid, 1);
-}
+struct slow_subchannel {
+	struct list_head slow_list;
+	struct subchannel_id schid;
+};
 
-void
+static LIST_HEAD(slow_subchannels_head);
+static DEFINE_SPINLOCK(slow_subchannel_lock);
+
+static void
 css_trigger_slow_path(void)
 {
+	CIO_TRACE_EVENT(4, "slowpath");
+
 	if (need_rescan) {
 		need_rescan = 0;
-		css_rescan_devices();
+		for_each_subchannel(css_rescan_devices, NULL);
 		return;
 	}
-	css_walk_subchannel_slow_list(css_evaluate_slow_subchannel);
+
+	spin_lock_irq(&slow_subchannel_lock);
+	while (!list_empty(&slow_subchannels_head)) {
+		struct slow_subchannel *slow_sch =
+			list_entry(slow_subchannels_head.next,
+				   struct slow_subchannel, slow_list);
+
+		list_del_init(slow_subchannels_head.next);
+		spin_unlock_irq(&slow_subchannel_lock);
+		css_evaluate_subchannel(slow_sch->schid, 1);
+		spin_lock_irq(&slow_subchannel_lock);
+		kfree(slow_sch);
+	}
+	spin_unlock_irq(&slow_subchannel_lock);
 }
 
+typedef void (*workfunc)(void *);
+DECLARE_WORK(slow_path_work, (workfunc)css_trigger_slow_path, NULL);
+struct workqueue_struct *slow_path_wq;
+
 /*
  * Rescan for new devices. FIXME: This is slow.
  * This function is called when we have lost CRWs due to overflows and we have
@@ -290,23 +355,31 @@ css_reiterate_subchannels(void)
  * Called from the machine check handler for subchannel report words.
  */
 int
-css_process_crw(int irq)
+css_process_crw(int rsid1, int rsid2)
 {
 	int ret;
+	struct subchannel_id mchk_schid;
 
-	CIO_CRW_EVENT(2, "source is subchannel %04X\n", irq);
+	CIO_CRW_EVENT(2, "source is subchannel %04X, subsystem id %x\n",
+		      rsid1, rsid2);
 
 	if (need_rescan)
 		/* We need to iterate all subchannels anyway. */
 		return -EAGAIN;
+
+	init_subchannel_id(&mchk_schid);
+	mchk_schid.sch_no = rsid1;
+	if (rsid2 != 0)
+		mchk_schid.ssid = (rsid2 >> 8) & 3;
+
 	/* 
 	 * Since we are always presented with IPI in the CRW, we have to
 	 * use stsch() to find out if the subchannel in question has come
 	 * or gone.
 	 */
-	ret = css_evaluate_subchannel(irq, 0);
+	ret = css_evaluate_subchannel(mchk_schid, 0);
 	if (ret == -EAGAIN) {
-		if (css_enqueue_subchannel_slow(irq)) {
+		if (css_enqueue_subchannel_slow(mchk_schid)) {
 			css_clear_subchannel_slow_list();
 			need_rescan = 1;
 		}
@@ -314,57 +387,181 @@ css_process_crw(int irq)
 	return ret;
 }
 
+static int __init
+__init_channel_subsystem(struct subchannel_id schid, void *data)
+{
+	struct subchannel *sch;
+	int ret;
+
+	if (cio_is_console(schid))
+		sch = cio_get_console_subchannel();
+	else {
+		sch = css_alloc_subchannel(schid);
+		if (IS_ERR(sch))
+			ret = PTR_ERR(sch);
+		else
+			ret = 0;
+		switch (ret) {
+		case 0:
+			break;
+		case -ENOMEM:
+			panic("Out of memory in init_channel_subsystem\n");
+		/* -ENXIO: no more subchannels. */
+		case -ENXIO:
+			return ret;
+		/* -EIO: this subchannel set not supported. */
+		case -EIO:
+			return ret;
+		default:
+			return 0;
+		}
+	}
+	/*
+	 * We register ALL valid subchannels in ioinfo, even those
+	 * that have been present before init_channel_subsystem.
+	 * These subchannels can't have been registered yet (kmalloc
+	 * not working) so we do it now. This is true e.g. for the
+	 * console subchannel.
+	 */
+	css_register_subchannel(sch);
+	return 0;
+}
+
+static void __init
+css_generate_pgid(struct channel_subsystem *css, u32 tod_high)
+{
+	if (css_characteristics_avail && css_general_characteristics.mcss) {
+		css->global_pgid.pgid_high.ext_cssid.version = 0x80;
+		css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid;
+	} else {
+#ifdef CONFIG_SMP
+		css->global_pgid.pgid_high.cpu_addr = hard_smp_processor_id();
+#else
+		css->global_pgid.pgid_high.cpu_addr = 0;
+#endif
+	}
+	css->global_pgid.cpu_id = ((cpuid_t *) __LC_CPUID)->ident;
+	css->global_pgid.cpu_model = ((cpuid_t *) __LC_CPUID)->machine;
+	css->global_pgid.tod_high = tod_high;
+
+}
+
+static void
+channel_subsystem_release(struct device *dev)
+{
+	struct channel_subsystem *css;
+
+	css = to_css(dev);
+	mutex_destroy(&css->mutex);
+	kfree(css);
+}
+
+static ssize_t
+css_cm_enable_show(struct device *dev, struct device_attribute *attr,
+		   char *buf)
+{
+	struct channel_subsystem *css = to_css(dev);
+
+	if (!css)
+		return 0;
+	return sprintf(buf, "%x\n", css->cm_enabled);
+}
+
+static ssize_t
+css_cm_enable_store(struct device *dev, struct device_attribute *attr,
+		    const char *buf, size_t count)
+{
+	struct channel_subsystem *css = to_css(dev);
+	int ret;
+
+	switch (buf[0]) {
+	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;
+	}
+	return ret < 0 ? ret : count;
+}
+
+static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store);
+
+static inline void __init
+setup_css(int nr)
+{
+	u32 tod_high;
+
+	memset(css[nr], 0, sizeof(struct channel_subsystem));
+	mutex_init(&css[nr]->mutex);
+	css[nr]->valid = 1;
+	css[nr]->cssid = nr;
+	sprintf(css[nr]->device.bus_id, "css%x", nr);
+	css[nr]->device.release = channel_subsystem_release;
+	tod_high = (u32) (get_clock() >> 32);
+	css_generate_pgid(css[nr], tod_high);
+}
+
 /*
- * some of the initialization has already been done from init_IRQ(),
- * here we do the rest now that the driver core is running.
+ * Now that the driver core is running, we can setup our channel subsystem.
  * The struct subchannel's are created during probing (except for the
  * static console subchannel).
  */
 static int __init
 init_channel_subsystem (void)
 {
-	int ret, irq;
+	int ret, i;
+
+	if (chsc_determine_css_characteristics() == 0)
+		css_characteristics_avail = 1;
 
 	if ((ret = bus_register(&css_bus_type)))
 		goto out;
-	if ((ret = device_register (&css_bus_device)))
-		goto out_bus;
 
+	/* Try to enable MSS. */
+	ret = chsc_enable_facility(CHSC_SDA_OC_MSS);
+	switch (ret) {
+	case 0: /* Success. */
+		max_ssid = __MAX_SSID;
+		break;
+	case -ENOMEM:
+		goto out_bus;
+	default:
+		max_ssid = 0;
+	}
+	/* Setup css structure. */
+	for (i = 0; i <= __MAX_CSSID; i++) {
+		css[i] = kmalloc(sizeof(struct channel_subsystem), GFP_KERNEL);
+		if (!css[i]) {
+			ret = -ENOMEM;
+			goto out_unregister;
+		}
+		setup_css(i);
+		ret = device_register(&css[i]->device);
+		if (ret)
+			goto out_free;
+		if (css_characteristics_avail && css_chsc_characteristics.secm)
+			device_create_file(&css[i]->device,
+					   &dev_attr_cm_enable);
+	}
 	css_init_done = 1;
 
 	ctl_set_bit(6, 28);
 
-	for (irq = 0; irq < __MAX_SUBCHANNELS; irq++) {
-		struct subchannel *sch;
-
-		if (cio_is_console(irq))
-			sch = cio_get_console_subchannel();
-		else {
-			sch = css_alloc_subchannel(irq);
-			if (IS_ERR(sch))
-				ret = PTR_ERR(sch);
-			else
-				ret = 0;
-			if (ret == -ENOMEM)
-				panic("Out of memory in "
-				      "init_channel_subsystem\n");
-			/* -ENXIO: no more subchannels. */
-			if (ret == -ENXIO)
-				break;
-			if (ret)
-				continue;
-		}
-		/*
-		 * We register ALL valid subchannels in ioinfo, even those
-		 * that have been present before init_channel_subsystem.
-		 * These subchannels can't have been registered yet (kmalloc
-		 * not working) so we do it now. This is true e.g. for the
-		 * console subchannel.
-		 */
-		css_register_subchannel(sch);
-	}
+	for_each_subchannel(__init_channel_subsystem, NULL);
 	return 0;
-
+out_free:
+	kfree(css[i]);
+out_unregister:
+	while (i > 0) {
+		i--;
+		if (css_characteristics_avail && css_chsc_characteristics.secm)
+			device_remove_file(&css[i]->device,
+					   &dev_attr_cm_enable);
+		device_unregister(&css[i]->device);
+	}
 out_bus:
 	bus_unregister(&css_bus_type);
 out:
@@ -388,67 +585,52 @@ css_bus_match (struct device *dev, struct device_driver *drv)
 	return 0;
 }
 
-struct bus_type css_bus_type = {
-	.name  = "css",
-	.match = &css_bus_match,
-};
-
-subsys_initcall(init_channel_subsystem);
-
-/*
- * Register root devices for some drivers. The release function must not be
- * in the device drivers, so we do it here.
- */
-static void
-s390_root_dev_release(struct device *dev)
+static int
+css_probe (struct device *dev)
 {
-	kfree(dev);
+	struct subchannel *sch;
+
+	sch = to_subchannel(dev);
+	sch->driver = container_of (dev->driver, struct css_driver, drv);
+	return (sch->driver->probe ? sch->driver->probe(sch) : 0);
 }
 
-struct device *
-s390_root_dev_register(const char *name)
+static int
+css_remove (struct device *dev)
 {
-	struct device *dev;
-	int ret;
+	struct subchannel *sch;
 
-	if (!strlen(name))
-		return ERR_PTR(-EINVAL);
-	dev = kmalloc(sizeof(struct device), GFP_KERNEL);
-	if (!dev)
-		return ERR_PTR(-ENOMEM);
-	memset(dev, 0, sizeof(struct device));
-	strncpy(dev->bus_id, name, min(strlen(name), (size_t)BUS_ID_SIZE));
-	dev->release = s390_root_dev_release;
-	ret = device_register(dev);
-	if (ret) {
-		kfree(dev);
-		return ERR_PTR(ret);
-	}
-	return dev;
+	sch = to_subchannel(dev);
+	return (sch->driver->remove ? sch->driver->remove(sch) : 0);
 }
 
-void
-s390_root_dev_unregister(struct device *dev)
+static void
+css_shutdown (struct device *dev)
 {
-	if (dev)
-		device_unregister(dev);
+	struct subchannel *sch;
+
+	sch = to_subchannel(dev);
+	if (sch->driver->shutdown)
+		sch->driver->shutdown(sch);
 }
 
-struct slow_subchannel {
-	struct list_head slow_list;
-	unsigned long schid;
+struct bus_type css_bus_type = {
+	.name     = "css",
+	.match    = css_bus_match,
+	.probe    = css_probe,
+	.remove   = css_remove,
+	.shutdown = css_shutdown,
 };
 
-static LIST_HEAD(slow_subchannels_head);
-static spinlock_t slow_subchannel_lock = SPIN_LOCK_UNLOCKED;
+subsys_initcall(init_channel_subsystem);
 
 int
-css_enqueue_subchannel_slow(unsigned long schid)
+css_enqueue_subchannel_slow(struct subchannel_id schid)
 {
 	struct slow_subchannel *new_slow_sch;
 	unsigned long flags;
 
-	new_slow_sch = kmalloc(sizeof(struct slow_subchannel), GFP_ATOMIC);
+	new_slow_sch = kzalloc(sizeof(struct slow_subchannel), GFP_ATOMIC);
 	if (!new_slow_sch)
 		return -ENOMEM;
 	new_slow_sch->schid = schid;
@@ -475,25 +657,7 @@ css_clear_subchannel_slow_list(void)
 	spin_unlock_irqrestore(&slow_subchannel_lock, flags);
 }
 
-void
-css_walk_subchannel_slow_list(void (*fn)(unsigned long))
-{
-	unsigned long flags;
 
-	spin_lock_irqsave(&slow_subchannel_lock, flags);
-	while (!list_empty(&slow_subchannels_head)) {
-		struct slow_subchannel *slow_sch =
-			list_entry(slow_subchannels_head.next,
-				   struct slow_subchannel, slow_list);
-
-		list_del_init(slow_subchannels_head.next);
-		spin_unlock_irqrestore(&slow_subchannel_lock, flags);
-		fn(slow_sch->schid);
-		spin_lock_irqsave(&slow_subchannel_lock, flags);
-		kfree(slow_sch);
-	}
-	spin_unlock_irqrestore(&slow_subchannel_lock, flags);
-}
 
 int
 css_slow_subchannels_exist(void)
@@ -503,5 +667,4 @@ css_slow_subchannels_exist(void)
 
 MODULE_LICENSE("GPL");
 EXPORT_SYMBOL(css_bus_type);
-EXPORT_SYMBOL(s390_root_dev_register);
-EXPORT_SYMBOL(s390_root_dev_unregister);
+EXPORT_SYMBOL_GPL(css_characteristics_avail);