[deliverable/linux.git] / arch / sparc64 / 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/irq.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)
{
	viodrv->driver.bus = &vio_bus_type;

	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);

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";

	if (strlen(bus_id_name) >= BUS_ID_SIZE - 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) {
		snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%s",
			 bus_id_name);
		vdev->dev_no = ~(u64)0;
	} else if (!cfg_handle) {
		snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%s-%lu",
			 bus_id_name, *id);
		vdev->dev_no = *id;
	} else {
		snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%s-%lu-%lu",
			 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", vdev->dev.bus_id);

	err = device_register(&vdev->dev);
	if (err) {
		printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
		       vdev->dev.bus_id, 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->bus_id);

		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",
};

const char *channel_devices_node = "channel-devices";
const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
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>
	13	#include <linux/irq.h>
	14	#include <linux/init.h>
	15
	16	#include <asm/mdesc.h>
	17	#include <asm/vio.h>
	18
e53e97ce DM	19	static const struct vio_device_id *vio_match_device(
	20	const struct vio_device_id *matches,
	21	const struct vio_dev *dev)
	22	{
	23	const char type, compat;
	24	int len;
	25
	26	type = dev->type;
	27	compat = dev->compat;
	28	len = dev->compat_len;
	29
	30	while (matches->type[0] \|\| matches->compat[0]) {
	31	int match = 1;
83292e0a DM	32	if (matches->type[0])
	33	match &= !strcmp(matches->type, type);
	34
e53e97ce	35	if (matches->compat[0]) {
83292e0a	36	match &= len &&
46bcea77	37	of_find_in_proplist(compat, matches->compat, len);
e53e97ce DM	38	}
	39	if (match)
	40	return matches;
	41	matches++;
	42	}
	43	return NULL;
	44	}
	45
	46	static int vio_bus_match(struct device dev, struct device_driver drv)
	47	{
	48	struct vio_dev *vio_dev = to_vio_dev(dev);
	49	struct vio_driver *vio_drv = to_vio_driver(drv);
	50	const struct vio_device_id *matches = vio_drv->id_table;
	51
	52	if (!matches)
	53	return 0;
	54
	55	return vio_match_device(matches, vio_dev) != NULL;
	56	}
	57
	58	static int vio_device_probe(struct device *dev)
	59	{
	60	struct vio_dev *vdev = to_vio_dev(dev);
	61	struct vio_driver *drv = to_vio_driver(dev->driver);
	62	const struct vio_device_id *id;
	63	int error = -ENODEV;
	64
	65	if (drv->probe) {
	66	id = vio_match_device(drv->id_table, vdev);
	67	if (id)
	68	error = drv->probe(vdev, id);
	69	}
	70
	71	return error;
	72	}
	73
	74	static int vio_device_remove(struct device *dev)
	75	{
	76	struct vio_dev *vdev = to_vio_dev(dev);
	77	struct vio_driver *drv = to_vio_driver(dev->driver);
	78
	79	if (drv->remove)
	80	return drv->remove(vdev);
	81
	82	return 1;
	83	}
	84
	85	static ssize_t devspec_show(struct device *dev,
	86	struct device_attribute attr, char buf)
	87	{
	88	struct vio_dev *vdev = to_vio_dev(dev);
	89	const char *str = "none";
	90
48db7b7c	91	if (!strcmp(vdev->type, "vnet-port"))
2c4f4ecb	92	str = "vnet";
48db7b7c	93	else if (!strcmp(vdev->type, "vdc-port"))
2c4f4ecb	94	str = "vdisk";
e53e97ce DM	95
	96	return sprintf(buf, "%s\n", str);
	97	}
	98
2c4f4ecb DM	99	static ssize_t type_show(struct device *dev,
	100	struct device_attribute attr, char buf)
	101	{
	102	struct vio_dev *vdev = to_vio_dev(dev);
	103	return sprintf(buf, "%s\n", vdev->type);
	104	}
	105
e53e97ce DM	106	static struct device_attribute vio_dev_attrs[] = {
e53e97ce DM	107	__ATTR_RO(devspec),
2c4f4ecb	108	__ATTR_RO(type),
e53e97ce DM	109	__ATTR_NULL
	110	};
	111
	112	static struct bus_type vio_bus_type = {
	113	.name = "vio",
	114	.dev_attrs = vio_dev_attrs,
	115	.match = vio_bus_match,
	116	.probe = vio_device_probe,
	117	.remove = vio_device_remove,
	118	};
	119
	120	int vio_register_driver(struct vio_driver *viodrv)
	121	{
	122	viodrv->driver.bus = &vio_bus_type;
	123
	124	return driver_register(&viodrv->driver);
	125	}
	126	EXPORT_SYMBOL(vio_register_driver);
	127
	128	void vio_unregister_driver(struct vio_driver *viodrv)
	129	{
	130	driver_unregister(&viodrv->driver);
	131	}
	132	EXPORT_SYMBOL(vio_unregister_driver);
	133
a1f35ba3	134	static void vio_dev_release(struct device *dev)
e53e97ce DM	135	{
	136	kfree(to_vio_dev(dev));
	137	}
	138
	139	static ssize_t
	140	show_pciobppath_attr(struct device dev, struct device_attribute attr,
	141	char *buf)
	142	{
	143	struct vio_dev *vdev;
	144	struct device_node *dp;
	145
	146	vdev = to_vio_dev(dev);
	147	dp = vdev->dp;
	148
	149	return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
	150	}
	151
	152	static DEVICE_ATTR(obppath, S_IRUSR \| S_IRGRP \| S_IROTH,
	153	show_pciobppath_attr, NULL);
	154
	155	struct device_node *cdev_node;
	156
	157	static struct vio_dev *root_vdev;
	158	static u64 cdev_cfg_handle;
	159
43fdf274 DM	160	static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
	161	struct vio_dev *vdev)
	162	{
	163	u64 a;
	164
	165	mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
	166	const u64 *chan_id;
	167	const u64 *irq;
	168	u64 target;
	169
	170	target = mdesc_arc_target(hp, a);
	171
	172	irq = mdesc_get_property(hp, target, "tx-ino", NULL);
	173	if (irq)
	174	vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
	175
	176	irq = mdesc_get_property(hp, target, "rx-ino", NULL);
	177	if (irq)
	178	vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
	179
	180	chan_id = mdesc_get_property(hp, target, "id", NULL);
	181	if (chan_id)
	182	vdev->channel_id = *chan_id;
	183	}
	184	}
	185
	186	static struct vio_dev vio_create_one(struct mdesc_handle hp, u64 mp,
e53e97ce DM	187	struct device *parent)
e53e97ce DM	188	{
6160f635	189	const char type, compat, *bus_id_name;
e53e97ce DM	190	struct device_node *dp;
e53e97ce DM	191	struct vio_dev *vdev;
83292e0a	192	int err, tlen, clen;
58fb6666 DM	193	const u64 id, cfg_handle;
58fb6666 DM	194	u64 a;
e53e97ce	195
83292e0a	196	type = mdesc_get_property(hp, mp, "device-type", &tlen);
2c4f4ecb	197	if (!type) {
83292e0a DM	198	type = mdesc_get_property(hp, mp, "name", &tlen);
83292e0a DM	199	if (!type) {
43fdf274	200	type = mdesc_node_name(hp, mp);
83292e0a DM	201	tlen = strlen(type) + 1;
	202	}
	203	}
	204	if (tlen > VIO_MAX_TYPE_LEN) {
	205	printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
	206	type);
	207	return NULL;
2c4f4ecb	208	}
83292e0a	209
58fb6666	210	id = mdesc_get_property(hp, mp, "id", NULL);
91ba3c21	211
58fb6666 DM	212	cfg_handle = NULL;
	213	mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
	214	u64 target;
91ba3c21	215
58fb6666 DM	216	target = mdesc_arc_target(hp, a);
58fb6666 DM	217	cfg_handle = mdesc_get_property(hp, target,
91ba3c21	218	"cfg-handle", NULL);
58fb6666 DM	219	if (cfg_handle)
	220	break;
	221	}
91ba3c21	222
6160f635 DM	223	bus_id_name = type;
	224	if (!strcmp(type, "domain-services-port"))
	225	bus_id_name = "ds";
	226
aab0de24	227	if (strlen(bus_id_name) >= BUS_ID_SIZE - 4) {
6160f635 DM	228	printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n",
	229	bus_id_name);
	230	return NULL;
	231	}
	232
43fdf274	233	compat = mdesc_get_property(hp, mp, "device-type", &clen);
83292e0a DM	234	if (!compat) {
	235	clen = 0;
	236	} else if (clen > VIO_MAX_COMPAT_LEN) {
	237	printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
	238	clen, type);
	239	return NULL;
	240	}
e53e97ce DM	241
	242	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
	243	if (!vdev) {
	244	printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
	245	return NULL;
	246	}
	247
	248	vdev->mp = mp;
83292e0a DM	249	memcpy(vdev->type, type, tlen);
	250	if (compat)
	251	memcpy(vdev->compat, compat, clen);
	252	else
	253	memset(vdev->compat, 0, sizeof(vdev->compat));
e53e97ce DM	254	vdev->compat_len = clen;
e53e97ce DM	255
43fdf274 DM	256	vdev->channel_id = ~0UL;
	257	vdev->tx_irq = ~0;
	258	vdev->rx_irq = ~0;
e53e97ce	259
43fdf274	260	vio_fill_channel_info(hp, mp, vdev);
e53e97ce	261
91ba3c21	262	if (!id) {
6160f635 DM	263	snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%s",
6160f635 DM	264	bus_id_name);
91ba3c21	265	vdev->dev_no = ~(u64)0;
58fb6666	266	} else if (!cfg_handle) {
6160f635 DM	267	snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%s-%lu",
6160f635 DM	268	bus_id_name, *id);
91ba3c21	269	vdev->dev_no = *id;
58fb6666 DM	270	} else {
	271	snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%s-%lu-%lu",
	272	bus_id_name, cfg_handle, id);
	273	vdev->dev_no = *cfg_handle;
91ba3c21	274	}
6160f635	275
e53e97ce DM	276	vdev->dev.parent = parent;
	277	vdev->dev.bus = &vio_bus_type;
	278	vdev->dev.release = vio_dev_release;
	279
	280	if (parent == NULL) {
	281	dp = cdev_node;
	282	} else if (to_vio_dev(parent) == root_vdev) {
	283	dp = of_get_next_child(cdev_node, NULL);
	284	while (dp) {
	285	if (!strcmp(dp->type, type))
	286	break;
	287
	288	dp = of_get_next_child(cdev_node, dp);
	289	}
	290	} else {
	291	dp = to_vio_dev(parent)->dp;
	292	}
	293	vdev->dp = dp;
	294
e2fd58d0	295	printk(KERN_INFO "VIO: Adding device %s\n", vdev->dev.bus_id);
6160f635	296
e53e97ce DM	297	err = device_register(&vdev->dev);
	298	if (err) {
	299	printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
	300	vdev->dev.bus_id, err);
	301	kfree(vdev);
	302	return NULL;
	303	}
	304	if (vdev->dp)
	305	err = sysfs_create_file(&vdev->dev.kobj,
	306	&dev_attr_obppath.attr);
	307
	308	return vdev;
	309	}
	310
6160f635	311	static void vio_add(struct mdesc_handle *hp, u64 node)
e53e97ce	312	{
6160f635	313	(void) vio_create_one(hp, node, &root_vdev->dev);
e53e97ce DM	314	}
e53e97ce DM	315
6160f635	316	static int vio_md_node_match(struct device dev, void arg)
e53e97ce	317	{
6160f635	318	struct vio_dev *vdev = to_vio_dev(dev);
2c4f4ecb	319
6160f635 DM	320	if (vdev->mp == (u64) arg)
6160f635 DM	321	return 1;
e53e97ce	322
6160f635 DM	323	return 0;
6160f635 DM	324	}
2c4f4ecb	325
6160f635 DM	326	static void vio_remove(struct mdesc_handle *hp, u64 node)
	327	{
	328	struct device *dev;
2c4f4ecb	329
6160f635 DM	330	dev = device_find_child(&root_vdev->dev, (void *) node,
	331	vio_md_node_match);
	332	if (dev) {
	333	printk(KERN_INFO "VIO: Removing device %s\n", dev->bus_id);
	334
	335	device_unregister(dev);
2c4f4ecb	336	}
e53e97ce DM	337	}
e53e97ce DM	338
6160f635 DM	339	static struct mdesc_notifier_client vio_device_notifier = {
	340	.add = vio_add,
	341	.remove = vio_remove,
	342	.node_name = "virtual-device-port",
	343	};
	344
07607c54 DM	345	/* We are only interested in domain service ports under the
	346	* "domain-services" node. On control nodes there is another port
	347	* under "openboot" that we should not mess with as aparently that is
	348	* reserved exclusively for OBP use.
	349	*/
	350	static void vio_add_ds(struct mdesc_handle *hp, u64 node)
	351	{
	352	int found;
	353	u64 a;
	354
	355	found = 0;
	356	mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
	357	u64 target = mdesc_arc_target(hp, a);
	358	const char *name = mdesc_node_name(hp, target);
	359
	360	if (!strcmp(name, "domain-services")) {
	361	found = 1;
	362	break;
	363	}
	364	}
	365
	366	if (found)
	367	(void) vio_create_one(hp, node, &root_vdev->dev);
	368	}
	369
6160f635	370	static struct mdesc_notifier_client vio_ds_notifier = {
07607c54	371	.add = vio_add_ds,
6160f635 DM	372	.remove = vio_remove,
	373	.node_name = "domain-services-port",
	374	};
	375
e53e97ce DM	376	const char *channel_devices_node = "channel-devices";
	377	const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
	378	const char *cfg_handle_prop = "cfg-handle";
	379
	380	static int __init vio_init(void)
	381	{
43fdf274	382	struct mdesc_handle *hp;
e53e97ce DM	383	const char *compat;
	384	const u64 *cfg_handle;
	385	int err, len;
43fdf274 DM	386	u64 root;
43fdf274 DM	387
f8be339c DM	388	err = bus_register(&vio_bus_type);
	389	if (err) {
	390	printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
	391	err);
	392	return err;
	393	}
	394
43fdf274 DM	395	hp = mdesc_grab();
	396	if (!hp)
	397	return 0;
e53e97ce	398
43fdf274 DM	399	root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
43fdf274 DM	400	if (root == MDESC_NODE_NULL) {
e53e97ce	401	printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
43fdf274	402	mdesc_release(hp);
e53e97ce DM	403	return 0;
	404	}
	405
	406	cdev_node = of_find_node_by_name(NULL, "channel-devices");
43fdf274	407	err = -ENODEV;
e53e97ce DM	408	if (!cdev_node) {
e53e97ce DM	409	printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
43fdf274	410	goto out_release;
e53e97ce DM	411	}
e53e97ce DM	412
43fdf274	413	compat = mdesc_get_property(hp, root, "compatible", &len);
e53e97ce DM	414	if (!compat) {
	415	printk(KERN_ERR "VIO: Channel devices lacks compatible "
	416	"property\n");
43fdf274	417	goto out_release;
e53e97ce	418	}
46bcea77	419	if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
e53e97ce DM	420	printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
e53e97ce DM	421	"compat entry.\n", channel_devices_compat);
43fdf274	422	goto out_release;
e53e97ce DM	423	}
e53e97ce DM	424
43fdf274	425	cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
e53e97ce DM	426	if (!cfg_handle) {
	427	printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
	428	cfg_handle_prop);
43fdf274	429	goto out_release;
e53e97ce DM	430	}
	431
	432	cdev_cfg_handle = *cfg_handle;
	433
6160f635 DM	434	root_vdev = vio_create_one(hp, root, NULL);
	435	err = -ENODEV;
	436	if (!root_vdev) {
	437	printk(KERN_ERR "VIO: Coult not create root device.\n");
	438	goto out_release;
	439	}
	440
920c3ed7 DM	441	mdesc_register_notifier(&vio_device_notifier);
	442	mdesc_register_notifier(&vio_ds_notifier);
	443
43fdf274	444	mdesc_release(hp);
e53e97ce	445
6160f635	446	return err;
43fdf274 DM	447
	448	out_release:
	449	mdesc_release(hp);
	450	return err;
e53e97ce DM	451	}
	452
	453	postcore_initcall(vio_init);