[deliverable/linux.git] / arch / sparc / kernel / vio.c

/* vio.c: Virtual I/O channel devices probing infrastructure.
 *
 *    Copyright (c) 2003-2005 IBM Corp.
 *     Dave Engebretsen engebret@us.ibm.com
 *     Santiago Leon santil@us.ibm.com
 *     Hollis Blanchard <hollisb@us.ibm.com>
 *     Stephen Rothwell
 *
 * Adapted to sparc64 by David S. Miller davem@davemloft.net
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/export.h>
#include <linux/init.h>

#include <asm/mdesc.h>
#include <asm/vio.h>

static const struct vio_device_id *vio_match_device(
	const struct vio_device_id *matches,
	const struct vio_dev *dev)
{
	const char *type, *compat;
	int len;

	type = dev->type;
	compat = dev->compat;
	len = dev->compat_len;

	while (matches->type[0] || matches->compat[0]) {
		int match = 1;
		if (matches->type[0])
			match &= !strcmp(matches->type, type);

		if (matches->compat[0]) {
			match &= len &&
				of_find_in_proplist(compat, matches->compat, len);
		}
		if (match)
			return matches;
		matches++;
	}
	return NULL;
}

static int vio_bus_match(struct device *dev, struct device_driver *drv)
{
	struct vio_dev *vio_dev = to_vio_dev(dev);
	struct vio_driver *vio_drv = to_vio_driver(drv);
	const struct vio_device_id *matches = vio_drv->id_table;

	if (!matches)
		return 0;

	return vio_match_device(matches, vio_dev) != NULL;
}

static int vio_device_probe(struct device *dev)
{
	struct vio_dev *vdev = to_vio_dev(dev);
	struct vio_driver *drv = to_vio_driver(dev->driver);
	const struct vio_device_id *id;
	int error = -ENODEV;

	if (drv->probe) {
		id = vio_match_device(drv->id_table, vdev);
		if (id)
			error = drv->probe(vdev, id);
	}

	return error;
}

static int vio_device_remove(struct device *dev)
{
	struct vio_dev *vdev = to_vio_dev(dev);
	struct vio_driver *drv = to_vio_driver(dev->driver);

	if (drv->remove)
		return drv->remove(vdev);

	return 1;
}

static ssize_t devspec_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct vio_dev *vdev = to_vio_dev(dev);
	const char *str = "none";

	if (!strcmp(vdev->type, "vnet-port"))
		str = "vnet";
	else if (!strcmp(vdev->type, "vdc-port"))
		str = "vdisk";

	return sprintf(buf, "%s\n", str);
}

static ssize_t type_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct vio_dev *vdev = to_vio_dev(dev);
	return sprintf(buf, "%s\n", vdev->type);
}

static struct device_attribute vio_dev_attrs[] = {
	__ATTR_RO(devspec),
	__ATTR_RO(type),
	__ATTR_NULL
};

static struct bus_type vio_bus_type = {
	.name		= "vio",
	.dev_attrs	= vio_dev_attrs,
	.match		= vio_bus_match,
	.probe		= vio_device_probe,
	.remove		= vio_device_remove,
};

int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
			const char *mod_name)
{
	viodrv->driver.bus = &vio_bus_type;
	viodrv->driver.name = viodrv->name;
	viodrv->driver.owner = owner;
	viodrv->driver.mod_name = mod_name;

	return driver_register(&viodrv->driver);
}
EXPORT_SYMBOL(__vio_register_driver);

void vio_unregister_driver(struct vio_driver *viodrv)
{
	driver_unregister(&viodrv->driver);
}
EXPORT_SYMBOL(vio_unregister_driver);

static void vio_dev_release(struct device *dev)
{
	kfree(to_vio_dev(dev));
}

static ssize_t
show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
		     char *buf)
{
	struct vio_dev *vdev;
	struct device_node *dp;

	vdev = to_vio_dev(dev);
	dp = vdev->dp;

	return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
}

static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
		   show_pciobppath_attr, NULL);

static struct device_node *cdev_node;

static struct vio_dev *root_vdev;
static u64 cdev_cfg_handle;

static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
				  struct vio_dev *vdev)
{
	u64 a;

	mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
		const u64 *chan_id;
		const u64 *irq;
		u64 target;

		target = mdesc_arc_target(hp, a);

		irq = mdesc_get_property(hp, target, "tx-ino", NULL);
		if (irq)
			vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);

		irq = mdesc_get_property(hp, target, "rx-ino", NULL);
		if (irq)
			vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);

		chan_id = mdesc_get_property(hp, target, "id", NULL);
		if (chan_id)
			vdev->channel_id = *chan_id;
	}
}

static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
				      struct device *parent)
{
	const char *type, *compat, *bus_id_name;
	struct device_node *dp;
	struct vio_dev *vdev;
	int err, tlen, clen;
	const u64 *id, *cfg_handle;
	u64 a;

	type = mdesc_get_property(hp, mp, "device-type", &tlen);
	if (!type) {
		type = mdesc_get_property(hp, mp, "name", &tlen);
		if (!type) {
			type = mdesc_node_name(hp, mp);
			tlen = strlen(type) + 1;
		}
	}
	if (tlen > VIO_MAX_TYPE_LEN) {
		printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
		       type);
		return NULL;
	}

	id = mdesc_get_property(hp, mp, "id", NULL);

	cfg_handle = NULL;
	mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
		u64 target;

		target = mdesc_arc_target(hp, a);
		cfg_handle = mdesc_get_property(hp, target,
						"cfg-handle", NULL);
		if (cfg_handle)
			break;
	}

	bus_id_name = type;
	if (!strcmp(type, "domain-services-port"))
		bus_id_name = "ds";

	/*
	 * 20 char is the old driver-core name size limit, which is no more.
	 * This check can probably be removed after review and possible
	 * adaption of the vio users name length handling.
	 */
	if (strlen(bus_id_name) >= 20 - 4) {
		printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n",
		       bus_id_name);
		return NULL;
	}

	compat = mdesc_get_property(hp, mp, "device-type", &clen);
	if (!compat) {
		clen = 0;
	} else if (clen > VIO_MAX_COMPAT_LEN) {
		printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
		       clen, type);
		return NULL;
	}

	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
	if (!vdev) {
		printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
		return NULL;
	}

	vdev->mp = mp;
	memcpy(vdev->type, type, tlen);
	if (compat)
		memcpy(vdev->compat, compat, clen);
	else
		memset(vdev->compat, 0, sizeof(vdev->compat));
	vdev->compat_len = clen;

	vdev->channel_id = ~0UL;
	vdev->tx_irq = ~0;
	vdev->rx_irq = ~0;

	vio_fill_channel_info(hp, mp, vdev);

	if (!id) {
		dev_set_name(&vdev->dev, "%s", bus_id_name);
		vdev->dev_no = ~(u64)0;
	} else if (!cfg_handle) {
		dev_set_name(&vdev->dev, "%s-%llu", bus_id_name, *id);
		vdev->dev_no = *id;
	} else {
		dev_set_name(&vdev->dev, "%s-%llu-%llu", bus_id_name,
			     *cfg_handle, *id);
		vdev->dev_no = *cfg_handle;
	}

	vdev->dev.parent = parent;
	vdev->dev.bus = &vio_bus_type;
	vdev->dev.release = vio_dev_release;

	if (parent == NULL) {
		dp = cdev_node;
	} else if (to_vio_dev(parent) == root_vdev) {
		dp = of_get_next_child(cdev_node, NULL);
		while (dp) {
			if (!strcmp(dp->type, type))
				break;

			dp = of_get_next_child(cdev_node, dp);
		}
	} else {
		dp = to_vio_dev(parent)->dp;
	}
	vdev->dp = dp;

	printk(KERN_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev));

	err = device_register(&vdev->dev);
	if (err) {
		printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
		       dev_name(&vdev->dev), err);
		kfree(vdev);
		return NULL;
	}
	if (vdev->dp)
		err = sysfs_create_file(&vdev->dev.kobj,
					&dev_attr_obppath.attr);

	return vdev;
}

static void vio_add(struct mdesc_handle *hp, u64 node)
{
	(void) vio_create_one(hp, node, &root_vdev->dev);
}

static int vio_md_node_match(struct device *dev, void *arg)
{
	struct vio_dev *vdev = to_vio_dev(dev);

	if (vdev->mp == (u64) arg)
		return 1;

	return 0;
}

static void vio_remove(struct mdesc_handle *hp, u64 node)
{
	struct device *dev;

	dev = device_find_child(&root_vdev->dev, (void *) node,
				vio_md_node_match);
	if (dev) {
		printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));

		device_unregister(dev);
	}
}

static struct mdesc_notifier_client vio_device_notifier = {
	.add		= vio_add,
	.remove		= vio_remove,
	.node_name	= "virtual-device-port",
};

/* We are only interested in domain service ports under the
 * "domain-services" node.  On control nodes there is another port
 * under "openboot" that we should not mess with as aparently that is
 * reserved exclusively for OBP use.
 */
static void vio_add_ds(struct mdesc_handle *hp, u64 node)
{
	int found;
	u64 a;

	found = 0;
	mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
		u64 target = mdesc_arc_target(hp, a);
		const char *name = mdesc_node_name(hp, target);

		if (!strcmp(name, "domain-services")) {
			found = 1;
			break;
		}
	}

	if (found)
		(void) vio_create_one(hp, node, &root_vdev->dev);
}

static struct mdesc_notifier_client vio_ds_notifier = {
	.add		= vio_add_ds,
	.remove		= vio_remove,
	.node_name	= "domain-services-port",
};

static const char *channel_devices_node = "channel-devices";
static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
static const char *cfg_handle_prop = "cfg-handle";

static int __init vio_init(void)
{
	struct mdesc_handle *hp;
	const char *compat;
	const u64 *cfg_handle;
	int err, len;
	u64 root;

	err = bus_register(&vio_bus_type);
	if (err) {
		printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
		       err);
		return err;
	}

	hp = mdesc_grab();
	if (!hp)
		return 0;

	root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
	if (root == MDESC_NODE_NULL) {
		printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
		mdesc_release(hp);
		return 0;
	}

	cdev_node = of_find_node_by_name(NULL, "channel-devices");
	err = -ENODEV;
	if (!cdev_node) {
		printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
		goto out_release;
	}

	compat = mdesc_get_property(hp, root, "compatible", &len);
	if (!compat) {
		printk(KERN_ERR "VIO: Channel devices lacks compatible "
		       "property\n");
		goto out_release;
	}
	if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
		printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
		       "compat entry.\n", channel_devices_compat);
		goto out_release;
	}

	cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
	if (!cfg_handle) {
		printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
		       cfg_handle_prop);
		goto out_release;
	}

	cdev_cfg_handle = *cfg_handle;

	root_vdev = vio_create_one(hp, root, NULL);
	err = -ENODEV;
	if (!root_vdev) {
		printk(KERN_ERR "VIO: Coult not create root device.\n");
		goto out_release;
	}

	mdesc_register_notifier(&vio_device_notifier);
	mdesc_register_notifier(&vio_ds_notifier);

	mdesc_release(hp);

	return err;

out_release:
	mdesc_release(hp);
	return err;
}

postcore_initcall(vio_init);
Commit	Line	Data
e53e97ce DM	1	/* vio.c: Virtual I/O channel devices probing infrastructure.
	2	*
	3	* Copyright (c) 2003-2005 IBM Corp.
	4	* Dave Engebretsen engebret@us.ibm.com
	5	* Santiago Leon santil@us.ibm.com
	6	* Hollis Blanchard <hollisb@us.ibm.com>
	7	* Stephen Rothwell
	8	*
	9	* Adapted to sparc64 by David S. Miller davem@davemloft.net
	10	*/
	11
	12	#include <linux/kernel.h>
5a0e3ad6	13	#include <linux/slab.h>
e53e97ce	14	#include <linux/irq.h>
7b64db60	15	#include <linux/export.h>
e53e97ce DM	16	#include <linux/init.h>
	17
	18	#include <asm/mdesc.h>
	19	#include <asm/vio.h>
	20
e53e97ce DM	21	static const struct vio_device_id *vio_match_device(
	22	const struct vio_device_id *matches,
	23	const struct vio_dev *dev)
	24	{
	25	const char type, compat;
	26	int len;
	27
	28	type = dev->type;
	29	compat = dev->compat;
	30	len = dev->compat_len;
	31
	32	while (matches->type[0] \|\| matches->compat[0]) {
	33	int match = 1;
83292e0a DM	34	if (matches->type[0])
	35	match &= !strcmp(matches->type, type);
	36
e53e97ce	37	if (matches->compat[0]) {
83292e0a	38	match &= len &&
46bcea77	39	of_find_in_proplist(compat, matches->compat, len);
e53e97ce DM	40	}
	41	if (match)
	42	return matches;
	43	matches++;
	44	}
	45	return NULL;
	46	}
	47
	48	static int vio_bus_match(struct device dev, struct device_driver drv)
	49	{
	50	struct vio_dev *vio_dev = to_vio_dev(dev);
	51	struct vio_driver *vio_drv = to_vio_driver(drv);
	52	const struct vio_device_id *matches = vio_drv->id_table;
	53
	54	if (!matches)
	55	return 0;
	56
	57	return vio_match_device(matches, vio_dev) != NULL;
	58	}
	59
	60	static int vio_device_probe(struct device *dev)
	61	{
	62	struct vio_dev *vdev = to_vio_dev(dev);
	63	struct vio_driver *drv = to_vio_driver(dev->driver);
	64	const struct vio_device_id *id;
	65	int error = -ENODEV;
	66
	67	if (drv->probe) {
	68	id = vio_match_device(drv->id_table, vdev);
	69	if (id)
	70	error = drv->probe(vdev, id);
	71	}
	72
	73	return error;
	74	}
	75
	76	static int vio_device_remove(struct device *dev)
	77	{
	78	struct vio_dev *vdev = to_vio_dev(dev);
	79	struct vio_driver *drv = to_vio_driver(dev->driver);
	80
	81	if (drv->remove)
	82	return drv->remove(vdev);
	83
	84	return 1;
	85	}
	86
	87	static ssize_t devspec_show(struct device *dev,
	88	struct device_attribute attr, char buf)
	89	{
	90	struct vio_dev *vdev = to_vio_dev(dev);
	91	const char *str = "none";
	92
48db7b7c	93	if (!strcmp(vdev->type, "vnet-port"))
2c4f4ecb	94	str = "vnet";
48db7b7c	95	else if (!strcmp(vdev->type, "vdc-port"))
2c4f4ecb	96	str = "vdisk";
e53e97ce DM	97
	98	return sprintf(buf, "%s\n", str);
	99	}
	100
2c4f4ecb DM	101	static ssize_t type_show(struct device *dev,
	102	struct device_attribute attr, char buf)
	103	{
	104	struct vio_dev *vdev = to_vio_dev(dev);
	105	return sprintf(buf, "%s\n", vdev->type);
	106	}
	107
e53e97ce DM	108	static struct device_attribute vio_dev_attrs[] = {
e53e97ce DM	109	__ATTR_RO(devspec),
2c4f4ecb	110	__ATTR_RO(type),
e53e97ce DM	111	__ATTR_NULL
	112	};
	113
	114	static struct bus_type vio_bus_type = {
	115	.name = "vio",
	116	.dev_attrs = vio_dev_attrs,
	117	.match = vio_bus_match,
	118	.probe = vio_device_probe,
	119	.remove = vio_device_remove,
	120	};
	121
cb52d897 BH	122	int __vio_register_driver(struct vio_driver viodrv, struct module owner,
cb52d897 BH	123	const char *mod_name)
e53e97ce DM	124	{
e53e97ce DM	125	viodrv->driver.bus = &vio_bus_type;
cb52d897 BH	126	viodrv->driver.name = viodrv->name;
	127	viodrv->driver.owner = owner;
	128	viodrv->driver.mod_name = mod_name;
e53e97ce DM	129
	130	return driver_register(&viodrv->driver);
	131	}
cb52d897	132	EXPORT_SYMBOL(__vio_register_driver);
e53e97ce DM	133
	134	void vio_unregister_driver(struct vio_driver *viodrv)
	135	{
	136	driver_unregister(&viodrv->driver);
	137	}
	138	EXPORT_SYMBOL(vio_unregister_driver);
	139
a1f35ba3	140	static void vio_dev_release(struct device *dev)
e53e97ce DM	141	{
	142	kfree(to_vio_dev(dev));
	143	}
	144
	145	static ssize_t
	146	show_pciobppath_attr(struct device dev, struct device_attribute attr,
	147	char *buf)
	148	{
	149	struct vio_dev *vdev;
	150	struct device_node *dp;
	151
	152	vdev = to_vio_dev(dev);
	153	dp = vdev->dp;
	154
	155	return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
	156	}
	157
	158	static DEVICE_ATTR(obppath, S_IRUSR \| S_IRGRP \| S_IROTH,
	159	show_pciobppath_attr, NULL);
	160
7694b024	161	static struct device_node *cdev_node;
e53e97ce DM	162
	163	static struct vio_dev *root_vdev;
	164	static u64 cdev_cfg_handle;
	165
43fdf274 DM	166	static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
	167	struct vio_dev *vdev)
	168	{
	169	u64 a;
	170
	171	mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
	172	const u64 *chan_id;
	173	const u64 *irq;
	174	u64 target;
	175
	176	target = mdesc_arc_target(hp, a);
	177
	178	irq = mdesc_get_property(hp, target, "tx-ino", NULL);
	179	if (irq)
	180	vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
	181
	182	irq = mdesc_get_property(hp, target, "rx-ino", NULL);
	183	if (irq)
	184	vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
	185
	186	chan_id = mdesc_get_property(hp, target, "id", NULL);
	187	if (chan_id)
	188	vdev->channel_id = *chan_id;
	189	}
	190	}
	191
	192	static struct vio_dev vio_create_one(struct mdesc_handle hp, u64 mp,
e53e97ce DM	193	struct device *parent)
e53e97ce DM	194	{
6160f635	195	const char type, compat, *bus_id_name;
e53e97ce DM	196	struct device_node *dp;
e53e97ce DM	197	struct vio_dev *vdev;
83292e0a	198	int err, tlen, clen;
58fb6666 DM	199	const u64 id, cfg_handle;
58fb6666 DM	200	u64 a;
e53e97ce	201
83292e0a	202	type = mdesc_get_property(hp, mp, "device-type", &tlen);
2c4f4ecb	203	if (!type) {
83292e0a DM	204	type = mdesc_get_property(hp, mp, "name", &tlen);
83292e0a DM	205	if (!type) {
43fdf274	206	type = mdesc_node_name(hp, mp);
83292e0a DM	207	tlen = strlen(type) + 1;
	208	}
	209	}
	210	if (tlen > VIO_MAX_TYPE_LEN) {
	211	printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
	212	type);
	213	return NULL;
2c4f4ecb	214	}
83292e0a	215
58fb6666	216	id = mdesc_get_property(hp, mp, "id", NULL);
91ba3c21	217
58fb6666 DM	218	cfg_handle = NULL;
	219	mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
	220	u64 target;
91ba3c21	221
58fb6666 DM	222	target = mdesc_arc_target(hp, a);
58fb6666 DM	223	cfg_handle = mdesc_get_property(hp, target,
91ba3c21	224	"cfg-handle", NULL);
58fb6666 DM	225	if (cfg_handle)
	226	break;
	227	}
91ba3c21	228
6160f635 DM	229	bus_id_name = type;
	230	if (!strcmp(type, "domain-services-port"))
	231	bus_id_name = "ds";
	232
08f42877 KS	233	/*
	234	* 20 char is the old driver-core name size limit, which is no more.
	235	* This check can probably be removed after review and possible
	236	* adaption of the vio users name length handling.
	237	*/
	238	if (strlen(bus_id_name) >= 20 - 4) {
6160f635 DM	239	printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n",
	240	bus_id_name);
	241	return NULL;
	242	}
	243
43fdf274	244	compat = mdesc_get_property(hp, mp, "device-type", &clen);
83292e0a DM	245	if (!compat) {
	246	clen = 0;
	247	} else if (clen > VIO_MAX_COMPAT_LEN) {
	248	printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
	249	clen, type);
	250	return NULL;
	251	}
e53e97ce DM	252
	253	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
	254	if (!vdev) {
	255	printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
	256	return NULL;
	257	}
	258
	259	vdev->mp = mp;
83292e0a DM	260	memcpy(vdev->type, type, tlen);
	261	if (compat)
	262	memcpy(vdev->compat, compat, clen);
	263	else
	264	memset(vdev->compat, 0, sizeof(vdev->compat));
e53e97ce DM	265	vdev->compat_len = clen;
e53e97ce DM	266
43fdf274 DM	267	vdev->channel_id = ~0UL;
	268	vdev->tx_irq = ~0;
	269	vdev->rx_irq = ~0;
e53e97ce	270
43fdf274	271	vio_fill_channel_info(hp, mp, vdev);
e53e97ce	272
91ba3c21	273	if (!id) {
2222c313	274	dev_set_name(&vdev->dev, "%s", bus_id_name);
91ba3c21	275	vdev->dev_no = ~(u64)0;
58fb6666	276	} else if (!cfg_handle) {
90181136	277	dev_set_name(&vdev->dev, "%s-%llu", bus_id_name, *id);
91ba3c21	278	vdev->dev_no = *id;
58fb6666	279	} else {
90181136	280	dev_set_name(&vdev->dev, "%s-%llu-%llu", bus_id_name,
2222c313	281	cfg_handle, id);
58fb6666	282	vdev->dev_no = *cfg_handle;
91ba3c21	283	}
6160f635	284
e53e97ce DM	285	vdev->dev.parent = parent;
	286	vdev->dev.bus = &vio_bus_type;
	287	vdev->dev.release = vio_dev_release;
	288
	289	if (parent == NULL) {
	290	dp = cdev_node;
	291	} else if (to_vio_dev(parent) == root_vdev) {
	292	dp = of_get_next_child(cdev_node, NULL);
	293	while (dp) {
	294	if (!strcmp(dp->type, type))
	295	break;
	296
	297	dp = of_get_next_child(cdev_node, dp);
	298	}
	299	} else {
	300	dp = to_vio_dev(parent)->dp;
	301	}
	302	vdev->dp = dp;
	303
2222c313	304	printk(KERN_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev));
6160f635	305
e53e97ce DM	306	err = device_register(&vdev->dev);
	307	if (err) {
	308	printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
2222c313	309	dev_name(&vdev->dev), err);
e53e97ce DM	310	kfree(vdev);
	311	return NULL;
	312	}
	313	if (vdev->dp)
	314	err = sysfs_create_file(&vdev->dev.kobj,
	315	&dev_attr_obppath.attr);
	316
	317	return vdev;
	318	}
	319
6160f635	320	static void vio_add(struct mdesc_handle *hp, u64 node)
e53e97ce	321	{
6160f635	322	(void) vio_create_one(hp, node, &root_vdev->dev);
e53e97ce DM	323	}
e53e97ce DM	324
6160f635	325	static int vio_md_node_match(struct device dev, void arg)
e53e97ce	326	{
6160f635	327	struct vio_dev *vdev = to_vio_dev(dev);
2c4f4ecb	328
6160f635 DM	329	if (vdev->mp == (u64) arg)
6160f635 DM	330	return 1;
e53e97ce	331
6160f635 DM	332	return 0;
6160f635 DM	333	}
2c4f4ecb	334
6160f635 DM	335	static void vio_remove(struct mdesc_handle *hp, u64 node)
	336	{
	337	struct device *dev;
2c4f4ecb	338
6160f635 DM	339	dev = device_find_child(&root_vdev->dev, (void *) node,
	340	vio_md_node_match);
	341	if (dev) {
2222c313	342	printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
6160f635 DM	343
6160f635 DM	344	device_unregister(dev);
2c4f4ecb	345	}
e53e97ce DM	346	}
e53e97ce DM	347
6160f635 DM	348	static struct mdesc_notifier_client vio_device_notifier = {
	349	.add = vio_add,
	350	.remove = vio_remove,
	351	.node_name = "virtual-device-port",
	352	};
	353
07607c54 DM	354	/* We are only interested in domain service ports under the
	355	* "domain-services" node. On control nodes there is another port
	356	* under "openboot" that we should not mess with as aparently that is
	357	* reserved exclusively for OBP use.
	358	*/
	359	static void vio_add_ds(struct mdesc_handle *hp, u64 node)
	360	{
	361	int found;
	362	u64 a;
	363
	364	found = 0;
	365	mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
	366	u64 target = mdesc_arc_target(hp, a);
	367	const char *name = mdesc_node_name(hp, target);
	368
	369	if (!strcmp(name, "domain-services")) {
	370	found = 1;
	371	break;
	372	}
	373	}
	374
	375	if (found)
	376	(void) vio_create_one(hp, node, &root_vdev->dev);
	377	}
	378
6160f635	379	static struct mdesc_notifier_client vio_ds_notifier = {
07607c54	380	.add = vio_add_ds,
6160f635 DM	381	.remove = vio_remove,
	382	.node_name = "domain-services-port",
	383	};
	384
7694b024 DM	385	static const char *channel_devices_node = "channel-devices";
	386	static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
	387	static const char *cfg_handle_prop = "cfg-handle";
e53e97ce DM	388
	389	static int __init vio_init(void)
	390	{
43fdf274	391	struct mdesc_handle *hp;
e53e97ce DM	392	const char *compat;
	393	const u64 *cfg_handle;
	394	int err, len;
43fdf274 DM	395	u64 root;
43fdf274 DM	396
f8be339c DM	397	err = bus_register(&vio_bus_type);
	398	if (err) {
	399	printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
	400	err);
	401	return err;
	402	}
	403
43fdf274 DM	404	hp = mdesc_grab();
	405	if (!hp)
	406	return 0;
e53e97ce	407
43fdf274 DM	408	root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
43fdf274 DM	409	if (root == MDESC_NODE_NULL) {
e53e97ce	410	printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
43fdf274	411	mdesc_release(hp);
e53e97ce DM	412	return 0;
	413	}
	414
	415	cdev_node = of_find_node_by_name(NULL, "channel-devices");
43fdf274	416	err = -ENODEV;
e53e97ce DM	417	if (!cdev_node) {
e53e97ce DM	418	printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
43fdf274	419	goto out_release;
e53e97ce DM	420	}
e53e97ce DM	421
43fdf274	422	compat = mdesc_get_property(hp, root, "compatible", &len);
e53e97ce DM	423	if (!compat) {
	424	printk(KERN_ERR "VIO: Channel devices lacks compatible "
	425	"property\n");
43fdf274	426	goto out_release;
e53e97ce	427	}
46bcea77	428	if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
e53e97ce DM	429	printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
e53e97ce DM	430	"compat entry.\n", channel_devices_compat);
43fdf274	431	goto out_release;
e53e97ce DM	432	}
e53e97ce DM	433
43fdf274	434	cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
e53e97ce DM	435	if (!cfg_handle) {
	436	printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
	437	cfg_handle_prop);
43fdf274	438	goto out_release;
e53e97ce DM	439	}
	440
	441	cdev_cfg_handle = *cfg_handle;
	442
6160f635 DM	443	root_vdev = vio_create_one(hp, root, NULL);
	444	err = -ENODEV;
	445	if (!root_vdev) {
	446	printk(KERN_ERR "VIO: Coult not create root device.\n");
	447	goto out_release;
	448	}
	449
920c3ed7 DM	450	mdesc_register_notifier(&vio_device_notifier);
	451	mdesc_register_notifier(&vio_ds_notifier);
	452
43fdf274	453	mdesc_release(hp);
e53e97ce	454
6160f635	455	return err;
43fdf274 DM	456
	457	out_release:
	458	mdesc_release(hp);
	459	return err;
e53e97ce DM	460	}
	461
	462	postcore_initcall(vio_init);