These changes are the raw update to linux-4.4.6-rt14. Kernel sources

are taken from kernel.org, and rt patch from the rt wiki download page.

During the rebasing, the following patch collided:

Force tick interrupt and get rid of softirq magic(I70131fb85).

Collisions have been removed because its logic was found on the
source already.

Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>

3 files changed, 0 insertions, 1906 deletions

diff --git a/kernel/drivers/s390/kvm/Makefile b/kernel/drivers/s390/kvm/Makefile
deleted file mode 100644
index 241891a57..000000000
--- a/kernel/drivers/s390/kvm/Makefile
+++ /dev/null
@@ -1,9 +0,0 @@
-# Makefile for kvm guest drivers on s390
-#
-# Copyright IBM Corp. 2008
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License (version 2 only)
-# as published by the Free Software Foundation.
-
-obj-$(CONFIG_S390_GUEST) += kvm_virtio.o virtio_ccw.o
diff --git a/kernel/drivers/s390/kvm/kvm_virtio.c b/kernel/drivers/s390/kvm/kvm_virtio.c
deleted file mode 100644
index dd65c8b4c..000000000
--- a/kernel/drivers/s390/kvm/kvm_virtio.c
+++ /dev/null
@@ -1,510 +0,0 @@
-/*
- * virtio for kvm on s390
- *
- * Copyright IBM Corp. 2008
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License (version 2 only)
- * as published by the Free Software Foundation.
- *
- *    Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
- */
-
-#include <linux/kernel_stat.h>
-#include <linux/init.h>
-#include <linux/bootmem.h>
-#include <linux/err.h>
-#include <linux/virtio.h>
-#include <linux/virtio_config.h>
-#include <linux/slab.h>
-#include <linux/virtio_console.h>
-#include <linux/interrupt.h>
-#include <linux/virtio_ring.h>
-#include <linux/export.h>
-#include <linux/pfn.h>
-#include <asm/io.h>
-#include <asm/kvm_para.h>
-#include <asm/kvm_virtio.h>
-#include <asm/sclp.h>
-#include <asm/setup.h>
-#include <asm/irq.h>
-
-#define VIRTIO_SUBCODE_64 0x0D00
-
-/*
- * The pointer to our (page) of device descriptions.
- */
-static void *kvm_devices;
-static struct work_struct hotplug_work;
-
-struct kvm_device {
-	struct virtio_device vdev;
-	struct kvm_device_desc *desc;
-};
-
-#define to_kvmdev(vd) container_of(vd, struct kvm_device, vdev)
-
-/*
- * memory layout:
- * - kvm_device_descriptor
- *        struct kvm_device_desc
- * - configuration
- *        struct kvm_vqconfig
- * - feature bits
- * - config space
- */
-static struct kvm_vqconfig *kvm_vq_config(const struct kvm_device_desc *desc)
-{
-	return (struct kvm_vqconfig *)(desc + 1);
-}
-
-static u8 *kvm_vq_features(const struct kvm_device_desc *desc)
-{
-	return (u8 *)(kvm_vq_config(desc) + desc->num_vq);
-}
-
-static u8 *kvm_vq_configspace(const struct kvm_device_desc *desc)
-{
-	return kvm_vq_features(desc) + desc->feature_len * 2;
-}
-
-/*
- * The total size of the config page used by this device (incl. desc)
- */
-static unsigned desc_size(const struct kvm_device_desc *desc)
-{
-	return sizeof(*desc)
-		+ desc->num_vq * sizeof(struct kvm_vqconfig)
-		+ desc->feature_len * 2
-		+ desc->config_len;
-}
-
-/* This gets the device's feature bits. */
-static u64 kvm_get_features(struct virtio_device *vdev)
-{
-	unsigned int i;
-	u32 features = 0;
-	struct kvm_device_desc *desc = to_kvmdev(vdev)->desc;
-	u8 *in_features = kvm_vq_features(desc);
-
-	for (i = 0; i < min(desc->feature_len * 8, 32); i++)
-		if (in_features[i / 8] & (1 << (i % 8)))
-			features |= (1 << i);
-	return features;
-}
-
-static int kvm_finalize_features(struct virtio_device *vdev)
-{
-	unsigned int i, bits;
-	struct kvm_device_desc *desc = to_kvmdev(vdev)->desc;
-	/* Second half of bitmap is features we accept. */
-	u8 *out_features = kvm_vq_features(desc) + desc->feature_len;
-
-	/* Give virtio_ring a chance to accept features. */
-	vring_transport_features(vdev);
-
-	/* Make sure we don't have any features > 32 bits! */
-	BUG_ON((u32)vdev->features != vdev->features);
-
-	memset(out_features, 0, desc->feature_len);
-	bits = min_t(unsigned, desc->feature_len, sizeof(vdev->features)) * 8;
-	for (i = 0; i < bits; i++) {
-		if (__virtio_test_bit(vdev, i))
-			out_features[i / 8] |= (1 << (i % 8));
-	}
-
-	return 0;
-}
-
-/*
- * Reading and writing elements in config space
- */
-static void kvm_get(struct virtio_device *vdev, unsigned int offset,
-		   void *buf, unsigned len)
-{
-	struct kvm_device_desc *desc = to_kvmdev(vdev)->desc;
-
-	BUG_ON(offset + len > desc->config_len);
-	memcpy(buf, kvm_vq_configspace(desc) + offset, len);
-}
-
-static void kvm_set(struct virtio_device *vdev, unsigned int offset,
-		   const void *buf, unsigned len)
-{
-	struct kvm_device_desc *desc = to_kvmdev(vdev)->desc;
-
-	BUG_ON(offset + len > desc->config_len);
-	memcpy(kvm_vq_configspace(desc) + offset, buf, len);
-}
-
-/*
- * The operations to get and set the status word just access
- * the status field of the device descriptor. set_status will also
- * make a hypercall to the host, to tell about status changes
- */
-static u8 kvm_get_status(struct virtio_device *vdev)
-{
-	return to_kvmdev(vdev)->desc->status;
-}
-
-static void kvm_set_status(struct virtio_device *vdev, u8 status)
-{
-	BUG_ON(!status);
-	to_kvmdev(vdev)->desc->status = status;
-	kvm_hypercall1(KVM_S390_VIRTIO_SET_STATUS,
-		       (unsigned long) to_kvmdev(vdev)->desc);
-}
-
-/*
- * To reset the device, we use the KVM_VIRTIO_RESET hypercall, using the
- * descriptor address. The Host will zero the status and all the
- * features.
- */
-static void kvm_reset(struct virtio_device *vdev)
-{
-	kvm_hypercall1(KVM_S390_VIRTIO_RESET,
-		       (unsigned long) to_kvmdev(vdev)->desc);
-}
-
-/*
- * When the virtio_ring code wants to notify the Host, it calls us here and we
- * make a hypercall.  We hand the address  of the virtqueue so the Host
- * knows which virtqueue we're talking about.
- */
-static bool kvm_notify(struct virtqueue *vq)
-{
-	long rc;
-	struct kvm_vqconfig *config = vq->priv;
-
-	rc = kvm_hypercall1(KVM_S390_VIRTIO_NOTIFY, config->address);
-	if (rc < 0)
-		return false;
-	return true;
-}
-
-/*
- * This routine finds the first virtqueue described in the configuration of
- * this device and sets it up.
- */
-static struct virtqueue *kvm_find_vq(struct virtio_device *vdev,
-				     unsigned index,
-				     void (*callback)(struct virtqueue *vq),
-				     const char *name)
-{
-	struct kvm_device *kdev = to_kvmdev(vdev);
-	struct kvm_vqconfig *config;
-	struct virtqueue *vq;
-	int err;
-
-	if (index >= kdev->desc->num_vq)
-		return ERR_PTR(-ENOENT);
-
-	if (!name)
-		return NULL;
-
-	config = kvm_vq_config(kdev->desc)+index;
-
-	err = vmem_add_mapping(config->address,
-			       vring_size(config->num,
-					  KVM_S390_VIRTIO_RING_ALIGN));
-	if (err)
-		goto out;
-
-	vq = vring_new_virtqueue(index, config->num, KVM_S390_VIRTIO_RING_ALIGN,
-				 vdev, true, (void *) config->address,
-				 kvm_notify, callback, name);
-	if (!vq) {
-		err = -ENOMEM;
-		goto unmap;
-	}
-
-	/*
-	 * register a callback token
-	 * The host will sent this via the external interrupt parameter
-	 */
-	config->token = (u64) vq;
-
-	vq->priv = config;
-	return vq;
-unmap:
-	vmem_remove_mapping(config->address,
-			    vring_size(config->num,
-				       KVM_S390_VIRTIO_RING_ALIGN));
-out:
-	return ERR_PTR(err);
-}
-
-static void kvm_del_vq(struct virtqueue *vq)
-{
-	struct kvm_vqconfig *config = vq->priv;
-
-	vring_del_virtqueue(vq);
-	vmem_remove_mapping(config->address,
-			    vring_size(config->num,
-				       KVM_S390_VIRTIO_RING_ALIGN));
-}
-
-static void kvm_del_vqs(struct virtio_device *vdev)
-{
-	struct virtqueue *vq, *n;
-
-	list_for_each_entry_safe(vq, n, &vdev->vqs, list)
-		kvm_del_vq(vq);
-}
-
-static int kvm_find_vqs(struct virtio_device *vdev, unsigned nvqs,
-			struct virtqueue *vqs[],
-			vq_callback_t *callbacks[],
-			const char *names[])
-{
-	struct kvm_device *kdev = to_kvmdev(vdev);
-	int i;
-
-	/* We must have this many virtqueues. */
-	if (nvqs > kdev->desc->num_vq)
-		return -ENOENT;
-
-	for (i = 0; i < nvqs; ++i) {
-		vqs[i] = kvm_find_vq(vdev, i, callbacks[i], names[i]);
-		if (IS_ERR(vqs[i]))
-			goto error;
-	}
-	return 0;
-
-error:
-	kvm_del_vqs(vdev);
-	return PTR_ERR(vqs[i]);
-}
-
-static const char *kvm_bus_name(struct virtio_device *vdev)
-{
-	return "";
-}
-
-/*
- * The config ops structure as defined by virtio config
- */
-static const struct virtio_config_ops kvm_vq_configspace_ops = {
-	.get_features = kvm_get_features,
-	.finalize_features = kvm_finalize_features,
-	.get = kvm_get,
-	.set = kvm_set,
-	.get_status = kvm_get_status,
-	.set_status = kvm_set_status,
-	.reset = kvm_reset,
-	.find_vqs = kvm_find_vqs,
-	.del_vqs = kvm_del_vqs,
-	.bus_name = kvm_bus_name,
-};
-
-/*
- * The root device for the kvm virtio devices.
- * This makes them appear as /sys/devices/kvm_s390/0,1,2 not /sys/devices/0,1,2.
- */
-static struct device *kvm_root;
-
-/*
- * adds a new device and register it with virtio
- * appropriate drivers are loaded by the device model
- */
-static void add_kvm_device(struct kvm_device_desc *d, unsigned int offset)
-{
-	struct kvm_device *kdev;
-
-	kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
-	if (!kdev) {
-		printk(KERN_EMERG "Cannot allocate kvm dev %u type %u\n",
-		       offset, d->type);
-		return;
-	}
-
-	kdev->vdev.dev.parent = kvm_root;
-	kdev->vdev.id.device = d->type;
-	kdev->vdev.config = &kvm_vq_configspace_ops;
-	kdev->desc = d;
-
-	if (register_virtio_device(&kdev->vdev) != 0) {
-		printk(KERN_ERR "Failed to register kvm device %u type %u\n",
-		       offset, d->type);
-		kfree(kdev);
-	}
-}
-
-/*
- * scan_devices() simply iterates through the device page.
- * The type 0 is reserved to mean "end of devices".
- */
-static void scan_devices(void)
-{
-	unsigned int i;
-	struct kvm_device_desc *d;
-
-	for (i = 0; i < PAGE_SIZE; i += desc_size(d)) {
-		d = kvm_devices + i;
-
-		if (d->type == 0)
-			break;
-
-		add_kvm_device(d, i);
-	}
-}
-
-/*
- * match for a kvm device with a specific desc pointer
- */
-static int match_desc(struct device *dev, void *data)
-{
-	struct virtio_device *vdev = dev_to_virtio(dev);
-	struct kvm_device *kdev = to_kvmdev(vdev);
-
-	return kdev->desc == data;
-}
-
-/*
- * hotplug_device tries to find changes in the device page.
- */
-static void hotplug_devices(struct work_struct *dummy)
-{
-	unsigned int i;
-	struct kvm_device_desc *d;
-	struct device *dev;
-
-	for (i = 0; i < PAGE_SIZE; i += desc_size(d)) {
-		d = kvm_devices + i;
-
-		/* end of list */
-		if (d->type == 0)
-			break;
-
-		/* device already exists */
-		dev = device_find_child(kvm_root, d, match_desc);
-		if (dev) {
-			/* XXX check for hotplug remove */
-			put_device(dev);
-			continue;
-		}
-
-		/* new device */
-		printk(KERN_INFO "Adding new virtio device %p\n", d);
-		add_kvm_device(d, i);
-	}
-}
-
-/*
- * we emulate the request_irq behaviour on top of s390 extints
- */
-static void kvm_extint_handler(struct ext_code ext_code,
-			       unsigned int param32, unsigned long param64)
-{
-	struct virtqueue *vq;
-	u32 param;
-
-	if ((ext_code.subcode & 0xff00) != VIRTIO_SUBCODE_64)
-		return;
-	inc_irq_stat(IRQEXT_VRT);
-
-	/* The LSB might be overloaded, we have to mask it */
-	vq = (struct virtqueue *)(param64 & ~1UL);
-
-	/* We use ext_params to decide what this interrupt means */
-	param = param32 & VIRTIO_PARAM_MASK;
-
-	switch (param) {
-	case VIRTIO_PARAM_CONFIG_CHANGED:
-		virtio_config_changed(vq->vdev);
-		break;
-	case VIRTIO_PARAM_DEV_ADD:
-		schedule_work(&hotplug_work);
-		break;
-	case VIRTIO_PARAM_VRING_INTERRUPT:
-	default:
-		vring_interrupt(0, vq);
-		break;
-	}
-}
-
-/*
- * For s390-virtio, we expect a page above main storage containing
- * the virtio configuration. Try to actually load from this area
- * in order to figure out if the host provides this page.
- */
-static int __init test_devices_support(unsigned long addr)
-{
-	int ret = -EIO;
-
-	asm volatile(
-		"0:	lura	0,%1\n"
-		"1:	xgr	%0,%0\n"
-		"2:\n"
-		EX_TABLE(0b,2b)
-		EX_TABLE(1b,2b)
-		: "+d" (ret)
-		: "a" (addr)
-		: "0", "cc");
-	return ret;
-}
-/*
- * Init function for virtio
- * devices are in a single page above top of "normal" + standby mem
- */
-static int __init kvm_devices_init(void)
-{
-	int rc;
-	unsigned long total_memory_size = sclp_get_rzm() * sclp_get_rnmax();
-
-	if (!MACHINE_IS_KVM)
-		return -ENODEV;
-
-	if (test_devices_support(total_memory_size) < 0)
-		return -ENODEV;
-
-	rc = vmem_add_mapping(total_memory_size, PAGE_SIZE);
-	if (rc)
-		return rc;
-
-	kvm_devices = (void *) total_memory_size;
-
-	kvm_root = root_device_register("kvm_s390");
-	if (IS_ERR(kvm_root)) {
-		rc = PTR_ERR(kvm_root);
-		printk(KERN_ERR "Could not register kvm_s390 root device");
-		vmem_remove_mapping(total_memory_size, PAGE_SIZE);
-		return rc;
-	}
-
-	INIT_WORK(&hotplug_work, hotplug_devices);
-
-	irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL);
-	register_external_irq(EXT_IRQ_CP_SERVICE, kvm_extint_handler);
-
-	scan_devices();
-	return 0;
-}
-
-/* code for early console output with virtio_console */
-static __init int early_put_chars(u32 vtermno, const char *buf, int count)
-{
-	char scratch[17];
-	unsigned int len = count;
-
-	if (len > sizeof(scratch) - 1)
-		len = sizeof(scratch) - 1;
-	scratch[len] = '\0';
-	memcpy(scratch, buf, len);
-	kvm_hypercall1(KVM_S390_VIRTIO_NOTIFY, __pa(scratch));
-	return len;
-}
-
-static int __init s390_virtio_console_init(void)
-{
-	if (sclp_has_vt220() || sclp_has_linemode())
-		return -ENODEV;
-	return virtio_cons_early_init(early_put_chars);
-}
-console_initcall(s390_virtio_console_init);
-
-
-/*
- * We do this after core stuff, but before the drivers.
- */
-postcore_initcall(kvm_devices_init);
diff --git a/kernel/drivers/s390/kvm/virtio_ccw.c b/kernel/drivers/s390/kvm/virtio_ccw.c
deleted file mode 100644
index f8d8fdb26..000000000
--- a/kernel/drivers/s390/kvm/virtio_ccw.c
+++ /dev/null
@@ -1,1387 +0,0 @@
-/*
- * ccw based virtio transport
- *
- * Copyright IBM Corp. 2012, 2014
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License (version 2 only)
- * as published by the Free Software Foundation.
- *
- *    Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
- */
-
-#include <linux/kernel_stat.h>
-#include <linux/init.h>
-#include <linux/bootmem.h>
-#include <linux/err.h>
-#include <linux/virtio.h>
-#include <linux/virtio_config.h>
-#include <linux/slab.h>
-#include <linux/interrupt.h>
-#include <linux/virtio_ring.h>
-#include <linux/pfn.h>
-#include <linux/async.h>
-#include <linux/wait.h>
-#include <linux/list.h>
-#include <linux/bitops.h>
-#include <linux/module.h>
-#include <linux/io.h>
-#include <linux/kvm_para.h>
-#include <linux/notifier.h>
-#include <asm/setup.h>
-#include <asm/irq.h>
-#include <asm/cio.h>
-#include <asm/ccwdev.h>
-#include <asm/virtio-ccw.h>
-#include <asm/isc.h>
-#include <asm/airq.h>
-
-/*
- * virtio related functions
- */
-
-struct vq_config_block {
-	__u16 index;
-	__u16 num;
-} __packed;
-
-#define VIRTIO_CCW_CONFIG_SIZE 0x100
-/* same as PCI config space size, should be enough for all drivers */
-
-struct virtio_ccw_device {
-	struct virtio_device vdev;
-	__u8 *status;
-	__u8 config[VIRTIO_CCW_CONFIG_SIZE];
-	struct ccw_device *cdev;
-	__u32 curr_io;
-	int err;
-	unsigned int revision; /* Transport revision */
-	wait_queue_head_t wait_q;
-	spinlock_t lock;
-	struct list_head virtqueues;
-	unsigned long indicators;
-	unsigned long indicators2;
-	struct vq_config_block *config_block;
-	bool is_thinint;
-	bool going_away;
-	bool device_lost;
-	unsigned int config_ready;
-	void *airq_info;
-};
-
-struct vq_info_block_legacy {
-	__u64 queue;
-	__u32 align;
-	__u16 index;
-	__u16 num;
-} __packed;
-
-struct vq_info_block {
-	__u64 desc;
-	__u32 res0;
-	__u16 index;
-	__u16 num;
-	__u64 avail;
-	__u64 used;
-} __packed;
-
-struct virtio_feature_desc {
-	__u32 features;
-	__u8 index;
-} __packed;
-
-struct virtio_thinint_area {
-	unsigned long summary_indicator;
-	unsigned long indicator;
-	u64 bit_nr;
-	u8 isc;
-} __packed;
-
-struct virtio_rev_info {
-	__u16 revision;
-	__u16 length;
-	__u8 data[];
-};
-
-/* the highest virtio-ccw revision we support */
-#define VIRTIO_CCW_REV_MAX 1
-
-struct virtio_ccw_vq_info {
-	struct virtqueue *vq;
-	int num;
-	void *queue;
-	union {
-		struct vq_info_block s;
-		struct vq_info_block_legacy l;
-	} *info_block;
-	int bit_nr;
-	struct list_head node;
-	long cookie;
-};
-
-#define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */
-
-#define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8)
-#define MAX_AIRQ_AREAS 20
-
-static int virtio_ccw_use_airq = 1;
-
-struct airq_info {
-	rwlock_t lock;
-	u8 summary_indicator;
-	struct airq_struct airq;
-	struct airq_iv *aiv;
-};
-static struct airq_info *airq_areas[MAX_AIRQ_AREAS];
-
-#define CCW_CMD_SET_VQ 0x13
-#define CCW_CMD_VDEV_RESET 0x33
-#define CCW_CMD_SET_IND 0x43
-#define CCW_CMD_SET_CONF_IND 0x53
-#define CCW_CMD_READ_FEAT 0x12
-#define CCW_CMD_WRITE_FEAT 0x11
-#define CCW_CMD_READ_CONF 0x22
-#define CCW_CMD_WRITE_CONF 0x21
-#define CCW_CMD_WRITE_STATUS 0x31
-#define CCW_CMD_READ_VQ_CONF 0x32
-#define CCW_CMD_SET_IND_ADAPTER 0x73
-#define CCW_CMD_SET_VIRTIO_REV 0x83
-
-#define VIRTIO_CCW_DOING_SET_VQ 0x00010000
-#define VIRTIO_CCW_DOING_RESET 0x00040000
-#define VIRTIO_CCW_DOING_READ_FEAT 0x00080000
-#define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000
-#define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000
-#define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000
-#define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000
-#define VIRTIO_CCW_DOING_SET_IND 0x01000000
-#define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000
-#define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000
-#define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000
-#define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000
-#define VIRTIO_CCW_INTPARM_MASK 0xffff0000
-
-static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev)
-{
-	return container_of(vdev, struct virtio_ccw_device, vdev);
-}
-
-static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info)
-{
-	unsigned long i, flags;
-
-	write_lock_irqsave(&info->lock, flags);
-	for (i = 0; i < airq_iv_end(info->aiv); i++) {
-		if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) {
-			airq_iv_free_bit(info->aiv, i);
-			airq_iv_set_ptr(info->aiv, i, 0);
-			break;
-		}
-	}
-	write_unlock_irqrestore(&info->lock, flags);
-}
-
-static void virtio_airq_handler(struct airq_struct *airq)
-{
-	struct airq_info *info = container_of(airq, struct airq_info, airq);
-	unsigned long ai;
-
-	inc_irq_stat(IRQIO_VAI);
-	read_lock(&info->lock);
-	/* Walk through indicators field, summary indicator active. */
-	for (ai = 0;;) {
-		ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv));
-		if (ai == -1UL)
-			break;
-		vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
-	}
-	info->summary_indicator = 0;
-	smp_wmb();
-	/* Walk through indicators field, summary indicator not active. */
-	for (ai = 0;;) {
-		ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv));
-		if (ai == -1UL)
-			break;
-		vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
-	}
-	read_unlock(&info->lock);
-}
-
-static struct airq_info *new_airq_info(void)
-{
-	struct airq_info *info;
-	int rc;
-
-	info = kzalloc(sizeof(*info), GFP_KERNEL);
-	if (!info)
-		return NULL;
-	rwlock_init(&info->lock);
-	info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR);
-	if (!info->aiv) {
-		kfree(info);
-		return NULL;
-	}
-	info->airq.handler = virtio_airq_handler;
-	info->airq.lsi_ptr = &info->summary_indicator;
-	info->airq.lsi_mask = 0xff;
-	info->airq.isc = VIRTIO_AIRQ_ISC;
-	rc = register_adapter_interrupt(&info->airq);
-	if (rc) {
-		airq_iv_release(info->aiv);
-		kfree(info);
-		return NULL;
-	}
-	return info;
-}
-
-static void destroy_airq_info(struct airq_info *info)
-{
-	if (!info)
-		return;
-
-	unregister_adapter_interrupt(&info->airq);
-	airq_iv_release(info->aiv);
-	kfree(info);
-}
-
-static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs,
-					u64 *first, void **airq_info)
-{
-	int i, j;
-	struct airq_info *info;
-	unsigned long indicator_addr = 0;
-	unsigned long bit, flags;
-
-	for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) {
-		if (!airq_areas[i])
-			airq_areas[i] = new_airq_info();
-		info = airq_areas[i];
-		if (!info)
-			return 0;
-		write_lock_irqsave(&info->lock, flags);
-		bit = airq_iv_alloc(info->aiv, nvqs);
-		if (bit == -1UL) {
-			/* Not enough vacancies. */
-			write_unlock_irqrestore(&info->lock, flags);
-			continue;
-		}
-		*first = bit;
-		*airq_info = info;
-		indicator_addr = (unsigned long)info->aiv->vector;
-		for (j = 0; j < nvqs; j++) {
-			airq_iv_set_ptr(info->aiv, bit + j,
-					(unsigned long)vqs[j]);
-		}
-		write_unlock_irqrestore(&info->lock, flags);
-	}
-	return indicator_addr;
-}
-
-static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev)
-{
-	struct virtio_ccw_vq_info *info;
-
-	list_for_each_entry(info, &vcdev->virtqueues, node)
-		drop_airq_indicator(info->vq, vcdev->airq_info);
-}
-
-static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag)
-{
-	unsigned long flags;
-	__u32 ret;
-
-	spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
-	if (vcdev->err)
-		ret = 0;
-	else
-		ret = vcdev->curr_io & flag;
-	spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
-	return ret;
-}
-
-static int ccw_io_helper(struct virtio_ccw_device *vcdev,
-			 struct ccw1 *ccw, __u32 intparm)
-{
-	int ret;
-	unsigned long flags;
-	int flag = intparm & VIRTIO_CCW_INTPARM_MASK;
-
-	do {
-		spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
-		ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0);
-		if (!ret) {
-			if (!vcdev->curr_io)
-				vcdev->err = 0;
-			vcdev->curr_io |= flag;
-		}
-		spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
-		cpu_relax();
-	} while (ret == -EBUSY);
-	wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0);
-	return ret ? ret : vcdev->err;
-}
-
-static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
-				      struct ccw1 *ccw)
-{
-	int ret;
-	unsigned long *indicatorp = NULL;
-	struct virtio_thinint_area *thinint_area = NULL;
-	struct airq_info *airq_info = vcdev->airq_info;
-
-	if (vcdev->is_thinint) {
-		thinint_area = kzalloc(sizeof(*thinint_area),
-				       GFP_DMA | GFP_KERNEL);
-		if (!thinint_area)
-			return;
-		thinint_area->summary_indicator =
-			(unsigned long) &airq_info->summary_indicator;
-		thinint_area->isc = VIRTIO_AIRQ_ISC;
-		ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
-		ccw->count = sizeof(*thinint_area);
-		ccw->cda = (__u32)(unsigned long) thinint_area;
-	} else {
-		indicatorp = kmalloc(sizeof(&vcdev->indicators),
-				     GFP_DMA | GFP_KERNEL);
-		if (!indicatorp)
-			return;
-		*indicatorp = 0;
-		ccw->cmd_code = CCW_CMD_SET_IND;
-		ccw->count = sizeof(vcdev->indicators);
-		ccw->cda = (__u32)(unsigned long) indicatorp;
-	}
-	/* Deregister indicators from host. */
-	vcdev->indicators = 0;
-	ccw->flags = 0;
-	ret = ccw_io_helper(vcdev, ccw,
-			    vcdev->is_thinint ?
-			    VIRTIO_CCW_DOING_SET_IND_ADAPTER :
-			    VIRTIO_CCW_DOING_SET_IND);
-	if (ret && (ret != -ENODEV))
-		dev_info(&vcdev->cdev->dev,
-			 "Failed to deregister indicators (%d)\n", ret);
-	else if (vcdev->is_thinint)
-		virtio_ccw_drop_indicators(vcdev);
-	kfree(indicatorp);
-	kfree(thinint_area);
-}
-
-static inline long do_kvm_notify(struct subchannel_id schid,
-				 unsigned long queue_index,
-				 long cookie)
-{
-	register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY;
-	register struct subchannel_id __schid asm("2") = schid;
-	register unsigned long __index asm("3") = queue_index;
-	register long __rc asm("2");
-	register long __cookie asm("4") = cookie;
-
-	asm volatile ("diag 2,4,0x500\n"
-		      : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index),
-		      "d"(__cookie)
-		      : "memory", "cc");
-	return __rc;
-}
-
-static bool virtio_ccw_kvm_notify(struct virtqueue *vq)
-{
-	struct virtio_ccw_vq_info *info = vq->priv;
-	struct virtio_ccw_device *vcdev;
-	struct subchannel_id schid;
-
-	vcdev = to_vc_device(info->vq->vdev);
-	ccw_device_get_schid(vcdev->cdev, &schid);
-	info->cookie = do_kvm_notify(schid, vq->index, info->cookie);
-	if (info->cookie < 0)
-		return false;
-	return true;
-}
-
-static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev,
-				   struct ccw1 *ccw, int index)
-{
-	vcdev->config_block->index = index;
-	ccw->cmd_code = CCW_CMD_READ_VQ_CONF;
-	ccw->flags = 0;
-	ccw->count = sizeof(struct vq_config_block);
-	ccw->cda = (__u32)(unsigned long)(vcdev->config_block);
-	ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF);
-	return vcdev->config_block->num;
-}
-
-static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw)
-{
-	struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev);
-	struct virtio_ccw_vq_info *info = vq->priv;
-	unsigned long flags;
-	unsigned long size;
-	int ret;
-	unsigned int index = vq->index;
-
-	/* Remove from our list. */
-	spin_lock_irqsave(&vcdev->lock, flags);
-	list_del(&info->node);
-	spin_unlock_irqrestore(&vcdev->lock, flags);
-
-	/* Release from host. */
-	if (vcdev->revision == 0) {
-		info->info_block->l.queue = 0;
-		info->info_block->l.align = 0;
-		info->info_block->l.index = index;
-		info->info_block->l.num = 0;
-		ccw->count = sizeof(info->info_block->l);
-	} else {
-		info->info_block->s.desc = 0;
-		info->info_block->s.index = index;
-		info->info_block->s.num = 0;
-		info->info_block->s.avail = 0;
-		info->info_block->s.used = 0;
-		ccw->count = sizeof(info->info_block->s);
-	}
-	ccw->cmd_code = CCW_CMD_SET_VQ;
-	ccw->flags = 0;
-	ccw->cda = (__u32)(unsigned long)(info->info_block);
-	ret = ccw_io_helper(vcdev, ccw,
-			    VIRTIO_CCW_DOING_SET_VQ | index);
-	/*
-	 * -ENODEV isn't considered an error: The device is gone anyway.
-	 * This may happen on device detach.
-	 */
-	if (ret && (ret != -ENODEV))
-		dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d",
-			 ret, index);
-
-	vring_del_virtqueue(vq);
-	size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
-	free_pages_exact(info->queue, size);
-	kfree(info->info_block);
-	kfree(info);
-}
-
-static void virtio_ccw_del_vqs(struct virtio_device *vdev)
-{
-	struct virtqueue *vq, *n;
-	struct ccw1 *ccw;
-	struct virtio_ccw_device *vcdev = to_vc_device(vdev);
-
-	ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
-	if (!ccw)
-		return;
-
-	virtio_ccw_drop_indicator(vcdev, ccw);
-
-	list_for_each_entry_safe(vq, n, &vdev->vqs, list)
-		virtio_ccw_del_vq(vq, ccw);
-
-	kfree(ccw);
-}
-
-static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
-					     int i, vq_callback_t *callback,
-					     const char *name,
-					     struct ccw1 *ccw)
-{
-	struct virtio_ccw_device *vcdev = to_vc_device(vdev);
-	int err;
-	struct virtqueue *vq = NULL;
-	struct virtio_ccw_vq_info *info;
-	unsigned long size = 0; /* silence the compiler */
-	unsigned long flags;
-
-	/* Allocate queue. */
-	info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL);
-	if (!info) {
-		dev_warn(&vcdev->cdev->dev, "no info\n");
-		err = -ENOMEM;
-		goto out_err;
-	}
-	info->info_block = kzalloc(sizeof(*info->info_block),
-				   GFP_DMA | GFP_KERNEL);
-	if (!info->info_block) {
-		dev_warn(&vcdev->cdev->dev, "no info block\n");
-		err = -ENOMEM;
-		goto out_err;
-	}
-	info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i);
-	size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
-	info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
-	if (info->queue == NULL) {
-		dev_warn(&vcdev->cdev->dev, "no queue\n");
-		err = -ENOMEM;
-		goto out_err;
-	}
-
-	vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev,
-				 true, info->queue, virtio_ccw_kvm_notify,
-				 callback, name);
-	if (!vq) {
-		/* For now, we fail if we can't get the requested size. */
-		dev_warn(&vcdev->cdev->dev, "no vq\n");
-		err = -ENOMEM;
-		goto out_err;
-	}
-
-	/* Register it with the host. */
-	if (vcdev->revision == 0) {
-		info->info_block->l.queue = (__u64)info->queue;
-		info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN;
-		info->info_block->l.index = i;
-		info->info_block->l.num = info->num;
-		ccw->count = sizeof(info->info_block->l);
-	} else {
-		info->info_block->s.desc = (__u64)info->queue;
-		info->info_block->s.index = i;
-		info->info_block->s.num = info->num;
-		info->info_block->s.avail = (__u64)virtqueue_get_avail(vq);
-		info->info_block->s.used = (__u64)virtqueue_get_used(vq);
-		ccw->count = sizeof(info->info_block->s);
-	}
-	ccw->cmd_code = CCW_CMD_SET_VQ;
-	ccw->flags = 0;
-	ccw->cda = (__u32)(unsigned long)(info->info_block);
-	err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i);
-	if (err) {
-		dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n");
-		goto out_err;
-	}
-
-	info->vq = vq;
-	vq->priv = info;
-
-	/* Save it to our list. */
-	spin_lock_irqsave(&vcdev->lock, flags);
-	list_add(&info->node, &vcdev->virtqueues);
-	spin_unlock_irqrestore(&vcdev->lock, flags);
-
-	return vq;
-
-out_err:
-	if (vq)
-		vring_del_virtqueue(vq);
-	if (info) {
-		if (info->queue)
-			free_pages_exact(info->queue, size);
-		kfree(info->info_block);
-	}
-	kfree(info);
-	return ERR_PTR(err);
-}
-
-static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev,
-					   struct virtqueue *vqs[], int nvqs,
-					   struct ccw1 *ccw)
-{
-	int ret;
-	struct virtio_thinint_area *thinint_area = NULL;
-	struct airq_info *info;
-
-	thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL);
-	if (!thinint_area) {
-		ret = -ENOMEM;
-		goto out;
-	}
-	/* Try to get an indicator. */
-	thinint_area->indicator = get_airq_indicator(vqs, nvqs,
-						     &thinint_area->bit_nr,
-						     &vcdev->airq_info);
-	if (!thinint_area->indicator) {
-		ret = -ENOSPC;
-		goto out;
-	}
-	info = vcdev->airq_info;
-	thinint_area->summary_indicator =
-		(unsigned long) &info->summary_indicator;
-	thinint_area->isc = VIRTIO_AIRQ_ISC;
-	ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
-	ccw->flags = CCW_FLAG_SLI;
-	ccw->count = sizeof(*thinint_area);
-	ccw->cda = (__u32)(unsigned long)thinint_area;
-	ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER);
-	if (ret) {
-		if (ret == -EOPNOTSUPP) {
-			/*
-			 * The host does not support adapter interrupts
-			 * for virtio-ccw, stop trying.
-			 */
-			virtio_ccw_use_airq = 0;
-			pr_info("Adapter interrupts unsupported on host\n");
-		} else
-			dev_warn(&vcdev->cdev->dev,
-				 "enabling adapter interrupts = %d\n", ret);
-		virtio_ccw_drop_indicators(vcdev);
-	}
-out:
-	kfree(thinint_area);
-	return ret;
-}
-
-static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
-			       struct virtqueue *vqs[],
-			       vq_callback_t *callbacks[],
-			       const char *names[])
-{
-	struct virtio_ccw_device *vcdev = to_vc_device(vdev);
-	unsigned long *indicatorp = NULL;
-	int ret, i;
-	struct ccw1 *ccw;
-
-	ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
-	if (!ccw)
-		return -ENOMEM;
-
-	for (i = 0; i < nvqs; ++i) {
-		vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i],
-					     ccw);
-		if (IS_ERR(vqs[i])) {
-			ret = PTR_ERR(vqs[i]);
-			vqs[i] = NULL;
-			goto out;
-		}
-	}
-	ret = -ENOMEM;
-	/* We need a data area under 2G to communicate. */
-	indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL);
-	if (!indicatorp)
-		goto out;
-	*indicatorp = (unsigned long) &vcdev->indicators;
-	if (vcdev->is_thinint) {
-		ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw);
-		if (ret)
-			/* no error, just fall back to legacy interrupts */
-			vcdev->is_thinint = 0;
-	}
-	if (!vcdev->is_thinint) {
-		/* Register queue indicators with host. */
-		vcdev->indicators = 0;
-		ccw->cmd_code = CCW_CMD_SET_IND;
-		ccw->flags = 0;
-		ccw->count = sizeof(vcdev->indicators);
-		ccw->cda = (__u32)(unsigned long) indicatorp;
-		ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND);
-		if (ret)
-			goto out;
-	}
-	/* Register indicators2 with host for config changes */
-	*indicatorp = (unsigned long) &vcdev->indicators2;
-	vcdev->indicators2 = 0;
-	ccw->cmd_code = CCW_CMD_SET_CONF_IND;
-	ccw->flags = 0;
-	ccw->count = sizeof(vcdev->indicators2);
-	ccw->cda = (__u32)(unsigned long) indicatorp;
-	ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND);
-	if (ret)
-		goto out;
-
-	kfree(indicatorp);
-	kfree(ccw);
-	return 0;
-out:
-	kfree(indicatorp);
-	kfree(ccw);
-	virtio_ccw_del_vqs(vdev);
-	return ret;
-}
-
-static void virtio_ccw_reset(struct virtio_device *vdev)
-{
-	struct virtio_ccw_device *vcdev = to_vc_device(vdev);
-	struct ccw1 *ccw;
-
-	ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
-	if (!ccw)
-		return;
-
-	/* Zero status bits. */
-	*vcdev->status = 0;
-
-	/* Send a reset ccw on device. */
-	ccw->cmd_code = CCW_CMD_VDEV_RESET;
-	ccw->flags = 0;
-	ccw->count = 0;
-	ccw->cda = 0;
-	ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET);
-	kfree(ccw);
-}
-
-static u64 virtio_ccw_get_features(struct virtio_device *vdev)
-{
-	struct virtio_ccw_device *vcdev = to_vc_device(vdev);
-	struct virtio_feature_desc *features;
-	int ret;
-	u64 rc;
-	struct ccw1 *ccw;
-
-	ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
-	if (!ccw)
-		return 0;
-
-	features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
-	if (!features) {
-		rc = 0;
-		goto out_free;
-	}
-	/* Read the feature bits from the host. */
-	features->index = 0;
-	ccw->cmd_code = CCW_CMD_READ_FEAT;
-	ccw->flags = 0;
-	ccw->count = sizeof(*features);
-	ccw->cda = (__u32)(unsigned long)features;
-	ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
-	if (ret) {
-		rc = 0;
-		goto out_free;
-	}
-
-	rc = le32_to_cpu(features->features);
-
-	if (vcdev->revision == 0)
-		goto out_free;
-
-	/* Read second half of the feature bits from the host. */
-	features->index = 1;
-	ccw->cmd_code = CCW_CMD_READ_FEAT;
-	ccw->flags = 0;
-	ccw->count = sizeof(*features);
-	ccw->cda = (__u32)(unsigned long)features;
-	ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
-	if (ret == 0)
-		rc |= (u64)le32_to_cpu(features->features) << 32;
-
-out_free:
-	kfree(features);
-	kfree(ccw);
-	return rc;
-}
-
-static int virtio_ccw_finalize_features(struct virtio_device *vdev)
-{
-	struct virtio_ccw_device *vcdev = to_vc_device(vdev);
-	struct virtio_feature_desc *features;
-	struct ccw1 *ccw;
-	int ret;
-
-	if (vcdev->revision >= 1 &&
-	    !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
-		dev_err(&vdev->dev, "virtio: device uses revision 1 "
-			"but does not have VIRTIO_F_VERSION_1\n");
-		return -EINVAL;
-	}
-
-	ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
-	if (!ccw)
-		return -ENOMEM;
-
-	features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
-	if (!features) {
-		ret = -ENOMEM;
-		goto out_free;
-	}
-	/* Give virtio_ring a chance to accept features. */
-	vring_transport_features(vdev);
-
-	features->index = 0;
-	features->features = cpu_to_le32((u32)vdev->features);
-	/* Write the first half of the feature bits to the host. */
-	ccw->cmd_code = CCW_CMD_WRITE_FEAT;
-	ccw->flags = 0;
-	ccw->count = sizeof(*features);
-	ccw->cda = (__u32)(unsigned long)features;
-	ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
-	if (ret)
-		goto out_free;
-
-	if (vcdev->revision == 0)
-		goto out_free;
-
-	features->index = 1;
-	features->features = cpu_to_le32(vdev->features >> 32);
-	/* Write the second half of the feature bits to the host. */
-	ccw->cmd_code = CCW_CMD_WRITE_FEAT;
-	ccw->flags = 0;
-	ccw->count = sizeof(*features);
-	ccw->cda = (__u32)(unsigned long)features;
-	ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
-
-out_free:
-	kfree(features);
-	kfree(ccw);
-
-	return ret;
-}
-
-static void virtio_ccw_get_config(struct virtio_device *vdev,
-				  unsigned int offset, void *buf, unsigned len)
-{
-	struct virtio_ccw_device *vcdev = to_vc_device(vdev);
-	int ret;
-	struct ccw1 *ccw;
-	void *config_area;
-
-	ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
-	if (!ccw)
-		return;
-
-	config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
-	if (!config_area)
-		goto out_free;
-
-	/* Read the config area from the host. */
-	ccw->cmd_code = CCW_CMD_READ_CONF;
-	ccw->flags = 0;
-	ccw->count = offset + len;
-	ccw->cda = (__u32)(unsigned long)config_area;
-	ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG);
-	if (ret)
-		goto out_free;
-
-	memcpy(vcdev->config, config_area, offset + len);
-	if (buf)
-		memcpy(buf, &vcdev->config[offset], len);
-	if (vcdev->config_ready < offset + len)
-		vcdev->config_ready = offset + len;
-
-out_free:
-	kfree(config_area);
-	kfree(ccw);
-}
-
-static void virtio_ccw_set_config(struct virtio_device *vdev,
-				  unsigned int offset, const void *buf,
-				  unsigned len)
-{
-	struct virtio_ccw_device *vcdev = to_vc_device(vdev);
-	struct ccw1 *ccw;
-	void *config_area;
-
-	ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
-	if (!ccw)
-		return;
-
-	config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
-	if (!config_area)
-		goto out_free;
-
-	/* Make sure we don't overwrite fields. */
-	if (vcdev->config_ready < offset)
-		virtio_ccw_get_config(vdev, 0, NULL, offset);
-	memcpy(&vcdev->config[offset], buf, len);
-	/* Write the config area to the host. */
-	memcpy(config_area, vcdev->config, sizeof(vcdev->config));
-	ccw->cmd_code = CCW_CMD_WRITE_CONF;
-	ccw->flags = 0;
-	ccw->count = offset + len;
-	ccw->cda = (__u32)(unsigned long)config_area;
-	ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG);
-
-out_free:
-	kfree(config_area);
-	kfree(ccw);
-}
-
-static u8 virtio_ccw_get_status(struct virtio_device *vdev)
-{
-	struct virtio_ccw_device *vcdev = to_vc_device(vdev);
-
-	return *vcdev->status;
-}
-
-static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status)
-{
-	struct virtio_ccw_device *vcdev = to_vc_device(vdev);
-	u8 old_status = *vcdev->status;
-	struct ccw1 *ccw;
-	int ret;
-
-	ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
-	if (!ccw)
-		return;
-
-	/* Write the status to the host. */
-	*vcdev->status = status;
-	ccw->cmd_code = CCW_CMD_WRITE_STATUS;
-	ccw->flags = 0;
-	ccw->count = sizeof(status);
-	ccw->cda = (__u32)(unsigned long)vcdev->status;
-	ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS);
-	/* Write failed? We assume status is unchanged. */
-	if (ret)
-		*vcdev->status = old_status;
-	kfree(ccw);
-}
-
-static struct virtio_config_ops virtio_ccw_config_ops = {
-	.get_features = virtio_ccw_get_features,
-	.finalize_features = virtio_ccw_finalize_features,
-	.get = virtio_ccw_get_config,
-	.set = virtio_ccw_set_config,
-	.get_status = virtio_ccw_get_status,
-	.set_status = virtio_ccw_set_status,
-	.reset = virtio_ccw_reset,
-	.find_vqs = virtio_ccw_find_vqs,
-	.del_vqs = virtio_ccw_del_vqs,
-};
-
-
-/*
- * ccw bus driver related functions
- */
-
-static void virtio_ccw_release_dev(struct device *_d)
-{
-	struct virtio_device *dev = container_of(_d, struct virtio_device,
-						 dev);
-	struct virtio_ccw_device *vcdev = to_vc_device(dev);
-
-	kfree(vcdev->status);
-	kfree(vcdev->config_block);
-	kfree(vcdev);
-}
-
-static int irb_is_error(struct irb *irb)
-{
-	if (scsw_cstat(&irb->scsw) != 0)
-		return 1;
-	if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))
-		return 1;
-	if (scsw_cc(&irb->scsw) != 0)
-		return 1;
-	return 0;
-}
-
-static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev,
-					      int index)
-{
-	struct virtio_ccw_vq_info *info;
-	unsigned long flags;
-	struct virtqueue *vq;
-
-	vq = NULL;
-	spin_lock_irqsave(&vcdev->lock, flags);
-	list_for_each_entry(info, &vcdev->virtqueues, node) {
-		if (info->vq->index == index) {
-			vq = info->vq;
-			break;
-		}
-	}
-	spin_unlock_irqrestore(&vcdev->lock, flags);
-	return vq;
-}
-
-static void virtio_ccw_int_handler(struct ccw_device *cdev,
-				   unsigned long intparm,
-				   struct irb *irb)
-{
-	__u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK;
-	struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
-	int i;
-	struct virtqueue *vq;
-
-	if (!vcdev)
-		return;
-	/* Check if it's a notification from the host. */
-	if ((intparm == 0) &&
-	    (scsw_stctl(&irb->scsw) ==
-	     (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) {
-		/* OK */
-	}
-	if (irb_is_error(irb)) {
-		/* Command reject? */
-		if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
-		    (irb->ecw[0] & SNS0_CMD_REJECT))
-			vcdev->err = -EOPNOTSUPP;
-		else
-			/* Map everything else to -EIO. */
-			vcdev->err = -EIO;
-	}
-	if (vcdev->curr_io & activity) {
-		switch (activity) {
-		case VIRTIO_CCW_DOING_READ_FEAT:
-		case VIRTIO_CCW_DOING_WRITE_FEAT:
-		case VIRTIO_CCW_DOING_READ_CONFIG:
-		case VIRTIO_CCW_DOING_WRITE_CONFIG:
-		case VIRTIO_CCW_DOING_WRITE_STATUS:
-		case VIRTIO_CCW_DOING_SET_VQ:
-		case VIRTIO_CCW_DOING_SET_IND:
-		case VIRTIO_CCW_DOING_SET_CONF_IND:
-		case VIRTIO_CCW_DOING_RESET:
-		case VIRTIO_CCW_DOING_READ_VQ_CONF:
-		case VIRTIO_CCW_DOING_SET_IND_ADAPTER:
-		case VIRTIO_CCW_DOING_SET_VIRTIO_REV:
-			vcdev->curr_io &= ~activity;
-			wake_up(&vcdev->wait_q);
-			break;
-		default:
-			/* don't know what to do... */
-			dev_warn(&cdev->dev, "Suspicious activity '%08x'\n",
-				 activity);
-			WARN_ON(1);
-			break;
-		}
-	}
-	for_each_set_bit(i, &vcdev->indicators,
-			 sizeof(vcdev->indicators) * BITS_PER_BYTE) {
-		/* The bit clear must happen before the vring kick. */
-		clear_bit(i, &vcdev->indicators);
-		barrier();
-		vq = virtio_ccw_vq_by_ind(vcdev, i);
-		vring_interrupt(0, vq);
-	}
-	if (test_bit(0, &vcdev->indicators2)) {
-		virtio_config_changed(&vcdev->vdev);
-		clear_bit(0, &vcdev->indicators2);
-	}
-}
-
-/*
- * We usually want to autoonline all devices, but give the admin
- * a way to exempt devices from this.
- */
-#define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
-		     (8*sizeof(long)))
-static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS];
-
-static char *no_auto = "";
-
-module_param(no_auto, charp, 0444);
-MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined");
-
-static int virtio_ccw_check_autoonline(struct ccw_device *cdev)
-{
-	struct ccw_dev_id id;
-
-	ccw_device_get_id(cdev, &id);
-	if (test_bit(id.devno, devs_no_auto[id.ssid]))
-		return 0;
-	return 1;
-}
-
-static void virtio_ccw_auto_online(void *data, async_cookie_t cookie)
-{
-	struct ccw_device *cdev = data;
-	int ret;
-
-	ret = ccw_device_set_online(cdev);
-	if (ret)
-		dev_warn(&cdev->dev, "Failed to set online: %d\n", ret);
-}
-
-static int virtio_ccw_probe(struct ccw_device *cdev)
-{
-	cdev->handler = virtio_ccw_int_handler;
-
-	if (virtio_ccw_check_autoonline(cdev))
-		async_schedule(virtio_ccw_auto_online, cdev);
-	return 0;
-}
-
-static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev)
-{
-	unsigned long flags;
-	struct virtio_ccw_device *vcdev;
-
-	spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
-	vcdev = dev_get_drvdata(&cdev->dev);
-	if (!vcdev || vcdev->going_away) {
-		spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
-		return NULL;
-	}
-	vcdev->going_away = true;
-	spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
-	return vcdev;
-}
-
-static void virtio_ccw_remove(struct ccw_device *cdev)
-{
-	unsigned long flags;
-	struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
-
-	if (vcdev && cdev->online) {
-		if (vcdev->device_lost)
-			virtio_break_device(&vcdev->vdev);
-		unregister_virtio_device(&vcdev->vdev);
-		spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
-		dev_set_drvdata(&cdev->dev, NULL);
-		spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
-	}
-	cdev->handler = NULL;
-}
-
-static int virtio_ccw_offline(struct ccw_device *cdev)
-{
-	unsigned long flags;
-	struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
-
-	if (!vcdev)
-		return 0;
-	if (vcdev->device_lost)
-		virtio_break_device(&vcdev->vdev);
-	unregister_virtio_device(&vcdev->vdev);
-	spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
-	dev_set_drvdata(&cdev->dev, NULL);
-	spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
-	return 0;
-}
-
-static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev)
-{
-	struct virtio_rev_info *rev;
-	struct ccw1 *ccw;
-	int ret;
-
-	ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
-	if (!ccw)
-		return -ENOMEM;
-	rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL);
-	if (!rev) {
-		kfree(ccw);
-		return -ENOMEM;
-	}
-
-	/* Set transport revision */
-	ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV;
-	ccw->flags = 0;
-	ccw->count = sizeof(*rev);
-	ccw->cda = (__u32)(unsigned long)rev;
-
-	vcdev->revision = VIRTIO_CCW_REV_MAX;
-	do {
-		rev->revision = vcdev->revision;
-		/* none of our supported revisions carry payload */
-		rev->length = 0;
-		ret = ccw_io_helper(vcdev, ccw,
-				    VIRTIO_CCW_DOING_SET_VIRTIO_REV);
-		if (ret == -EOPNOTSUPP) {
-			if (vcdev->revision == 0)
-				/*
-				 * The host device does not support setting
-				 * the revision: let's operate it in legacy
-				 * mode.
-				 */
-				ret = 0;
-			else
-				vcdev->revision--;
-		}
-	} while (ret == -EOPNOTSUPP);
-
-	kfree(ccw);
-	kfree(rev);
-	return ret;
-}
-
-static int virtio_ccw_online(struct ccw_device *cdev)
-{
-	int ret;
-	struct virtio_ccw_device *vcdev;
-	unsigned long flags;
-
-	vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL);
-	if (!vcdev) {
-		dev_warn(&cdev->dev, "Could not get memory for virtio\n");
-		ret = -ENOMEM;
-		goto out_free;
-	}
-	vcdev->config_block = kzalloc(sizeof(*vcdev->config_block),
-				   GFP_DMA | GFP_KERNEL);
-	if (!vcdev->config_block) {
-		ret = -ENOMEM;
-		goto out_free;
-	}
-	vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL);
-	if (!vcdev->status) {
-		ret = -ENOMEM;
-		goto out_free;
-	}
-
-	vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */
-
-	vcdev->vdev.dev.parent = &cdev->dev;
-	vcdev->vdev.dev.release = virtio_ccw_release_dev;
-	vcdev->vdev.config = &virtio_ccw_config_ops;
-	vcdev->cdev = cdev;
-	init_waitqueue_head(&vcdev->wait_q);
-	INIT_LIST_HEAD(&vcdev->virtqueues);
-	spin_lock_init(&vcdev->lock);
-
-	spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
-	dev_set_drvdata(&cdev->dev, vcdev);
-	spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
-	vcdev->vdev.id.vendor = cdev->id.cu_type;
-	vcdev->vdev.id.device = cdev->id.cu_model;
-
-	ret = virtio_ccw_set_transport_rev(vcdev);
-	if (ret)
-		goto out_free;
-
-	ret = register_virtio_device(&vcdev->vdev);
-	if (ret) {
-		dev_warn(&cdev->dev, "Failed to register virtio device: %d\n",
-			 ret);
-		goto out_put;
-	}
-	return 0;
-out_put:
-	spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
-	dev_set_drvdata(&cdev->dev, NULL);
-	spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
-	put_device(&vcdev->vdev.dev);
-	return ret;
-out_free:
-	if (vcdev) {
-		kfree(vcdev->status);
-		kfree(vcdev->config_block);
-	}
-	kfree(vcdev);
-	return ret;
-}
-
-static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event)
-{
-	int rc;
-	struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
-
-	/*
-	 * Make sure vcdev is set
-	 * i.e. set_offline/remove callback not already running
-	 */
-	if (!vcdev)
-		return NOTIFY_DONE;
-
-	switch (event) {
-	case CIO_GONE:
-		vcdev->device_lost = true;
-		rc = NOTIFY_DONE;
-		break;
-	default:
-		rc = NOTIFY_DONE;
-		break;
-	}
-	return rc;
-}
-
-static struct ccw_device_id virtio_ids[] = {
-	{ CCW_DEVICE(0x3832, 0) },
-	{},
-};
-MODULE_DEVICE_TABLE(ccw, virtio_ids);
-
-static struct ccw_driver virtio_ccw_driver = {
-	.driver = {
-		.owner = THIS_MODULE,
-		.name = "virtio_ccw",
-	},
-	.ids = virtio_ids,
-	.probe = virtio_ccw_probe,
-	.remove = virtio_ccw_remove,
-	.set_offline = virtio_ccw_offline,
-	.set_online = virtio_ccw_online,
-	.notify = virtio_ccw_cio_notify,
-	.int_class = IRQIO_VIR,
-};
-
-static int __init pure_hex(char **cp, unsigned int *val, int min_digit,
-			   int max_digit, int max_val)
-{
-	int diff;
-
-	diff = 0;
-	*val = 0;
-
-	while (diff <= max_digit) {
-		int value = hex_to_bin(**cp);
-
-		if (value < 0)
-			break;
-		*val = *val * 16 + value;
-		(*cp)++;
-		diff++;
-	}
-
-	if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
-		return 1;
-
-	return 0;
-}
-
-static int __init parse_busid(char *str, unsigned int *cssid,
-			      unsigned int *ssid, unsigned int *devno)
-{
-	char *str_work;
-	int rc, ret;
-
-	rc = 1;
-
-	if (*str == '\0')
-		goto out;
-
-	str_work = str;
-	ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
-	if (ret || (str_work[0] != '.'))
-		goto out;
-	str_work++;
-	ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
-	if (ret || (str_work[0] != '.'))
-		goto out;
-	str_work++;
-	ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
-	if (ret || (str_work[0] != '\0'))
-		goto out;
-
-	rc = 0;
-out:
-	return rc;
-}
-
-static void __init no_auto_parse(void)
-{
-	unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
-	char *parm, *str;
-	int rc;
-
-	str = no_auto;
-	while ((parm = strsep(&str, ","))) {
-		rc = parse_busid(strsep(&parm, "-"), &from_cssid,
-				 &from_ssid, &from);
-		if (rc)
-			continue;
-		if (parm != NULL) {
-			rc = parse_busid(parm, &to_cssid,
-					 &to_ssid, &to);
-			if ((from_ssid > to_ssid) ||
-			    ((from_ssid == to_ssid) && (from > to)))
-				rc = -EINVAL;
-		} else {
-			to_cssid = from_cssid;
-			to_ssid = from_ssid;
-			to = from;
-		}
-		if (rc)
-			continue;
-		while ((from_ssid < to_ssid) ||
-		       ((from_ssid == to_ssid) && (from <= to))) {
-			set_bit(from, devs_no_auto[from_ssid]);
-			from++;
-			if (from > __MAX_SUBCHANNEL) {
-				from_ssid++;
-				from = 0;
-			}
-		}
-	}
-}
-
-static int __init virtio_ccw_init(void)
-{
-	/* parse no_auto string before we do anything further */
-	no_auto_parse();
-	return ccw_driver_register(&virtio_ccw_driver);
-}
-module_init(virtio_ccw_init);
-
-static void __exit virtio_ccw_exit(void)
-{
-	int i;
-
-	ccw_driver_unregister(&virtio_ccw_driver);
-	for (i = 0; i < MAX_AIRQ_AREAS; i++)
-		destroy_airq_info(airq_areas[i]);
-}
-module_exit(virtio_ccw_exit);