[deliverable/linux.git] / drivers / pci / hotplug / rpadlpar_core.c

/*
 * Interface for Dynamic Logical Partitioning of I/O Slots on
 * RPA-compliant PPC64 platform.
 *
 * John Rose <johnrose@austin.ibm.com>
 * Linda Xie <lxie@us.ibm.com>
 *
 * October 2003
 *
 * Copyright (C) 2003 IBM.
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */
#include <linux/init.h>
#include <linux/pci.h>
#include <asm/pci-bridge.h>
#include <asm/semaphore.h>
#include <asm/rtas.h>
#include <asm/vio.h>
#include "../pci.h"
#include "rpaphp.h"
#include "rpadlpar.h"

static DECLARE_MUTEX(rpadlpar_sem);

#define NODE_TYPE_VIO  1
#define NODE_TYPE_SLOT 2
#define NODE_TYPE_PHB  3

static struct device_node *find_vio_slot_node(char *drc_name)
{
	struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
	struct device_node *dn = NULL;
	char *name;
	int rc;

	if (!parent)
		return NULL;

	while ((dn = of_get_next_child(parent, dn))) {
		rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL);
		if ((rc == 0) && (!strcmp(drc_name, name)))
			break;
	}

	return dn;
}

/* Find dlpar-capable pci node that contains the specified name and type */
static struct device_node *find_php_slot_pci_node(char *drc_name,
						  char *drc_type)
{
	struct device_node *np = NULL;
	char *name;
	char *type;
	int rc;

	while ((np = of_find_node_by_type(np, "pci"))) {
		rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL);
		if (rc == 0)
			if (!strcmp(drc_name, name) && !strcmp(drc_type, type))
				break;
	}

	return np;
}

static struct device_node *find_dlpar_node(char *drc_name, int *node_type)
{
	struct device_node *dn;

	dn = find_php_slot_pci_node(drc_name, "SLOT");
	if (dn) {
		*node_type = NODE_TYPE_SLOT;
		return dn;
	}

	dn = find_php_slot_pci_node(drc_name, "PHB");
	if (dn) {
		*node_type = NODE_TYPE_PHB;
		return dn;
	}

	dn = find_vio_slot_node(drc_name);
	if (dn) {
		*node_type = NODE_TYPE_VIO;
		return dn;
	}

	return NULL;
}

static struct slot *find_slot(char *drc_name)
{
	struct list_head *tmp, *n;
	struct slot *slot;

        list_for_each_safe(tmp, n, &rpaphp_slot_head) {
                slot = list_entry(tmp, struct slot, rpaphp_slot_list);
                if (strcmp(slot->location, drc_name) == 0)
                        return slot;
        }

        return NULL;
}

static void rpadlpar_claim_one_bus(struct pci_bus *b)
{
	struct list_head *ld;
	struct pci_bus *child_bus;

	for (ld = b->devices.next; ld != &b->devices; ld = ld->next) {
		struct pci_dev *dev = pci_dev_b(ld);
		int i;

		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
			struct resource *r = &dev->resource[i];

			if (r->parent || !r->start || !r->flags)
				continue;
			rpaphp_claim_resource(dev, i);
		}
	}

	list_for_each_entry(child_bus, &b->children, node)
		rpadlpar_claim_one_bus(child_bus);
}

static int pci_add_secondary_bus(struct device_node *dn,
		struct pci_dev *bridge_dev)
{
	struct pci_controller *hose = dn->phb;
	struct pci_bus *child;
	u8 sec_busno;

	/* Get busno of downstream bus */
	pci_read_config_byte(bridge_dev, PCI_SECONDARY_BUS, &sec_busno);

	/* Allocate and add to children of bridge_dev->bus */
	child = pci_add_new_bus(bridge_dev->bus, bridge_dev, sec_busno);
	if (!child) {
		printk(KERN_ERR "%s: could not add secondary bus\n", __FUNCTION__);
		return -ENOMEM;
	}

	sprintf(child->name, "PCI Bus #%02x", child->number);

	/* Fixup subordinate bridge bases and resources */
	pcibios_fixup_bus(child);

	/* Claim new bus resources */
	rpadlpar_claim_one_bus(bridge_dev->bus);

	if (hose->last_busno < child->number)
		hose->last_busno = child->number;

	dn->bussubno = child->number;

	/* ioremap() for child bus, which may or may not succeed */
	remap_bus_range(child);

	return 0;
}

static struct pci_dev *dlpar_pci_add_bus(struct device_node *dn)
{
	struct pci_controller *hose = dn->phb;
	struct pci_dev *dev = NULL;

	/* Scan phb bus for EADS device, adding new one to bus->devices */
	if (!pci_scan_single_device(hose->bus, dn->devfn)) {
		printk(KERN_ERR "%s: found no device on bus\n", __FUNCTION__);
		return NULL;
	}

	/* Add new devices to global lists.  Register in proc, sysfs. */
	pci_bus_add_devices(hose->bus);

	/* Confirm new bridge dev was created */
	dev = rpaphp_find_pci_dev(dn);
	if (!dev) {
		printk(KERN_ERR "%s: failed to add pci device\n", __FUNCTION__);
		return NULL;
	}

	if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
		printk(KERN_ERR "%s: unexpected header type %d\n",
			__FUNCTION__, dev->hdr_type);
		return NULL;
	}

	if (pci_add_secondary_bus(dn, dev))
		return NULL;

	return dev;
}

static int dlpar_pci_remove_bus(struct pci_dev *bridge_dev)
{
	struct pci_bus *secondary_bus;

	if (!bridge_dev) {
		printk(KERN_ERR "%s: unexpected null device\n",
			__FUNCTION__);
		return -EINVAL;
	}

	secondary_bus = bridge_dev->subordinate;

	if (unmap_bus_range(secondary_bus)) {
		printk(KERN_ERR "%s: failed to unmap bus range\n",
			__FUNCTION__);
		return -ERANGE;
	}

	pci_remove_bus_device(bridge_dev);
	return 0;
}

static inline int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
{
	struct pci_dev *dev;

	/* Add pci bus */
	dev = dlpar_pci_add_bus(dn);
	if (!dev) {
		printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__,
			drc_name);
		return -EIO;
	}

	/* Add hotplug slot */
	if (rpaphp_add_slot(dn)) {
		printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
			__FUNCTION__, drc_name);
		return -EIO;
	}
	return 0;
}

static int dlpar_remove_root_bus(struct pci_controller *phb)
{
	struct pci_bus *phb_bus;
	int rc;

	phb_bus = phb->bus;
	if (!(list_empty(&phb_bus->children) &&
	      list_empty(&phb_bus->devices))) {
		return -EBUSY;
	}

	rc = pcibios_remove_root_bus(phb);
	if (rc)
		return -EIO;

	device_unregister(phb_bus->bridge);
	pci_remove_bus(phb_bus);

	return 0;
}

static int dlpar_remove_phb(struct slot *slot)
{
	struct pci_controller *phb;
	struct device_node *dn;
	int rc = 0;

	dn = slot->dn;
	if (!dn) {
		printk(KERN_ERR "%s: unexpected NULL slot device node\n",
				__FUNCTION__);
		return -EIO;
	}

	phb = dn->phb;
	if (!phb) {
		printk(KERN_ERR "%s: unexpected NULL phb pointer\n",
				__FUNCTION__);
		return -EIO;
	}

	if (rpaphp_remove_slot(slot)) {
		printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",
			__FUNCTION__, slot->location);
		return -EIO;
	}

	rc = dlpar_remove_root_bus(phb);
	if (rc < 0)
		return rc;

	return 0;
}

static int dlpar_add_phb(char *drc_name, struct device_node *dn)
{
	struct pci_controller *phb;

	phb = init_phb_dynamic(dn);
	if (!phb)
		return -EINVAL;

	if (rpaphp_add_slot(dn)) {
		printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
			__FUNCTION__, drc_name);
		return -EIO;
	}
	return 0;
}

/**
 * dlpar_add_slot - DLPAR add an I/O Slot
 * @drc_name: drc-name of newly added slot
 *
 * Make the hotplug module and the kernel aware
 * of a newly added I/O Slot.
 * Return Codes -
 * 0			Success
 * -ENODEV		Not a valid drc_name
 * -EINVAL		Slot already added
 * -ERESTARTSYS		Signalled before obtaining lock
 * -EIO			Internal PCI Error
 */
int dlpar_add_slot(char *drc_name)
{
	struct device_node *dn = NULL;
	int node_type;
	int rc;

	if (down_interruptible(&rpadlpar_sem))
		return -ERESTARTSYS;

	/* Check for existing hotplug slot */
	if (find_slot(drc_name)) {
		rc = -EINVAL;
		goto exit;
	}

	/* Find newly added node */
	dn = find_dlpar_node(drc_name, &node_type);
	if (!dn) {
		rc = -ENODEV;
		goto exit;
	}

	rc = -EIO;
	switch (node_type) {
		case NODE_TYPE_VIO:
			if (!vio_register_device_node(dn)) {
				printk(KERN_ERR
					"%s: failed to register vio node %s\n",
					__FUNCTION__, drc_name);
				goto exit;
			}
			break;
		case NODE_TYPE_SLOT:
			rc = dlpar_add_pci_slot(drc_name, dn);
			if (rc)
				goto exit;
			break;
		case NODE_TYPE_PHB:
			rc = dlpar_add_phb(drc_name, dn);
			if (rc)
				goto exit;
			break;
		default:
			printk("%s: unexpected node type\n", __FUNCTION__);
			goto exit;
	}

	rc = 0;
exit:
	up(&rpadlpar_sem);
	return rc;
}

/**
 * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
 * @drc_name: drc-name of newly added slot
 *
 * Remove the kernel and hotplug representations
 * of an I/O Slot.
 * Return Codes:
 * 0			Success
 * -EIO			Internal  Error
 */
static int dlpar_remove_vio_slot(struct device_node *dn, char *drc_name)
{
	struct vio_dev *vio_dev;

	vio_dev = vio_find_node(dn);
	if (!vio_dev) {
		printk(KERN_ERR "%s: %s does not correspond to a vio dev\n",
				__FUNCTION__, drc_name);
		return -EIO;
	}

	vio_unregister_device(vio_dev);
	return 0;
}

/**
 * dlpar_remove_slot - DLPAR remove a PCI I/O Slot
 * @drc_name: drc-name of newly added slot
 *
 * Remove the kernel and hotplug representations
 * of a PCI I/O Slot.
 * Return Codes:
 * 0			Success
 * -ENODEV		Not a valid drc_name
 * -EIO			Internal PCI Error
 */
int dlpar_remove_pci_slot(struct slot *slot, char *drc_name)
{
	struct pci_dev *bridge_dev;

	bridge_dev = slot->bridge;
	if (!bridge_dev) {
		printk(KERN_ERR "%s: unexpected null bridge device\n",
			__FUNCTION__);
		return -EIO;
	}

	/* Remove hotplug slot */
	if (rpaphp_remove_slot(slot)) {
		printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",
			__FUNCTION__, drc_name);
		return -EIO;
	}

	/* Remove pci bus */

	if (dlpar_pci_remove_bus(bridge_dev)) {
		printk(KERN_ERR "%s: unable to remove pci bus %s\n",
			__FUNCTION__, drc_name);
		return -EIO;
	}
	return 0;
}

/**
 * dlpar_remove_slot - DLPAR remove an I/O Slot
 * @drc_name: drc-name of newly added slot
 *
 * Remove the kernel and hotplug representations
 * of an I/O Slot.
 * Return Codes:
 * 0			Success
 * -ENODEV		Not a valid drc_name
 * -EINVAL		Slot already removed
 * -ERESTARTSYS		Signalled before obtaining lock
 * -EIO			Internal Error
 */
int dlpar_remove_slot(char *drc_name)
{
	struct device_node *dn;
	struct slot *slot;
	int node_type;
	int rc = 0;

	if (down_interruptible(&rpadlpar_sem))
		return -ERESTARTSYS;

	dn = find_dlpar_node(drc_name, &node_type);
	if (!dn) {
		rc = -ENODEV;
		goto exit;
	}

	if (node_type == NODE_TYPE_VIO) {
		rc = dlpar_remove_vio_slot(dn, drc_name);
	} else {
		slot = find_slot(drc_name);
		if (!slot) {
			rc = -EINVAL;
			goto exit;
		}

		if (node_type == NODE_TYPE_PHB)
			rc = dlpar_remove_phb(slot);
		else {
			/* NODE_TYPE_SLOT */
			rc = dlpar_remove_pci_slot(slot, drc_name);
		}
	}
exit:
	up(&rpadlpar_sem);
	return rc;
}

static inline int is_dlpar_capable(void)
{
	int rc = rtas_token("ibm,configure-connector");

	return (int) (rc != RTAS_UNKNOWN_SERVICE);
}

int __init rpadlpar_io_init(void)
{
	int rc = 0;

	if (!is_dlpar_capable()) {
		printk(KERN_WARNING "%s: partition not DLPAR capable\n",
			__FUNCTION__);
		return -EPERM;
	}

	rc = dlpar_sysfs_init();
	return rc;
}

void rpadlpar_io_exit(void)
{
	dlpar_sysfs_exit();
	return;
}

module_init(rpadlpar_io_init);
module_exit(rpadlpar_io_exit);
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Interface for Dynamic Logical Partitioning of I/O Slots on
	3	* RPA-compliant PPC64 platform.
	4	*
	5	* John Rose <johnrose@austin.ibm.com>
	6	* Linda Xie <lxie@us.ibm.com>
	7	*
	8	* October 2003
	9	*
	10	* Copyright (C) 2003 IBM.
	11	*
	12	* This program is free software; you can redistribute it and/or
	13	* modify it under the terms of the GNU General Public License
	14	* as published by the Free Software Foundation; either version
	15	* 2 of the License, or (at your option) any later version.
	16	*/
	17	#include <linux/init.h>
	18	#include <linux/pci.h>
	19	#include <asm/pci-bridge.h>
	20	#include <asm/semaphore.h>
	21	#include <asm/rtas.h>
5eeb8c63	22	#include <asm/vio.h>
1da177e4 LT	23	#include "../pci.h"
	24	#include "rpaphp.h"
	25	#include "rpadlpar.h"
	26
	27	static DECLARE_MUTEX(rpadlpar_sem);
	28
	29	#define NODE_TYPE_VIO 1
	30	#define NODE_TYPE_SLOT 2
	31	#define NODE_TYPE_PHB 3
	32
5eeb8c63	33	static struct device_node find_vio_slot_node(char drc_name)
1da177e4	34	{
1da177e4	35	struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
5eeb8c63 JR	36	struct device_node *dn = NULL;
	37	char *name;
	38	int rc;
1da177e4 LT	39
	40	if (!parent)
	41	return NULL;
	42
5eeb8c63 JR	43	while ((dn = of_get_next_child(parent, dn))) {
	44	rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL);
	45	if ((rc == 0) && (!strcmp(drc_name, name)))
	46	break;
1da177e4 LT	47	}
1da177e4 LT	48
5eeb8c63	49	return dn;
1da177e4 LT	50	}
	51
	52	/* Find dlpar-capable pci node that contains the specified name and type */
	53	static struct device_node find_php_slot_pci_node(char drc_name,
	54	char *drc_type)
	55	{
	56	struct device_node *np = NULL;
	57	char *name;
	58	char *type;
	59	int rc;
	60
	61	while ((np = of_find_node_by_type(np, "pci"))) {
	62	rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL);
	63	if (rc == 0)
	64	if (!strcmp(drc_name, name) && !strcmp(drc_type, type))
	65	break;
	66	}
	67
	68	return np;
	69	}
	70
5eeb8c63	71	static struct device_node find_dlpar_node(char drc_name, int *node_type)
1da177e4 LT	72	{
	73	struct device_node *dn;
	74
	75	dn = find_php_slot_pci_node(drc_name, "SLOT");
	76	if (dn) {
	77	*node_type = NODE_TYPE_SLOT;
	78	return dn;
	79	}
	80
	81	dn = find_php_slot_pci_node(drc_name, "PHB");
	82	if (dn) {
	83	*node_type = NODE_TYPE_PHB;
	84	return dn;
	85	}
	86
5eeb8c63	87	dn = find_vio_slot_node(drc_name);
1da177e4 LT	88	if (dn) {
	89	*node_type = NODE_TYPE_VIO;
	90	return dn;
	91	}
	92
	93	return NULL;
	94	}
	95
	96	static struct slot find_slot(char drc_name)
	97	{
	98	struct list_head tmp, n;
	99	struct slot *slot;
	100
	101	list_for_each_safe(tmp, n, &rpaphp_slot_head) {
	102	slot = list_entry(tmp, struct slot, rpaphp_slot_list);
	103	if (strcmp(slot->location, drc_name) == 0)
	104	return slot;
	105	}
	106
	107	return NULL;
	108	}
	109
	110	static void rpadlpar_claim_one_bus(struct pci_bus *b)
	111	{
	112	struct list_head *ld;
	113	struct pci_bus *child_bus;
	114
	115	for (ld = b->devices.next; ld != &b->devices; ld = ld->next) {
	116	struct pci_dev *dev = pci_dev_b(ld);
	117	int i;
	118
	119	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
	120	struct resource *r = &dev->resource[i];
	121
	122	if (r->parent \|\| !r->start \|\| !r->flags)
	123	continue;
	124	rpaphp_claim_resource(dev, i);
	125	}
	126	}
	127
	128	list_for_each_entry(child_bus, &b->children, node)
	129	rpadlpar_claim_one_bus(child_bus);
	130	}
	131
	132	static int pci_add_secondary_bus(struct device_node *dn,
	133	struct pci_dev *bridge_dev)
	134	{
	135	struct pci_controller *hose = dn->phb;
	136	struct pci_bus *child;
	137	u8 sec_busno;
	138
	139	/* Get busno of downstream bus */
	140	pci_read_config_byte(bridge_dev, PCI_SECONDARY_BUS, &sec_busno);
	141
	142	/* Allocate and add to children of bridge_dev->bus */
	143	child = pci_add_new_bus(bridge_dev->bus, bridge_dev, sec_busno);
	144	if (!child) {
	145	printk(KERN_ERR "%s: could not add secondary bus\n", __FUNCTION__);
	146	return -ENOMEM;
	147	}
	148
	149	sprintf(child->name, "PCI Bus #%02x", child->number);
	150
	151	/* Fixup subordinate bridge bases and resources */
152	pcibios_fixup_bus(child);
153
154	/* Claim new bus resources */
155	rpadlpar_claim_one_bus(bridge_dev->bus);
156
157	if (hose->last_busno < child->number)
158	hose->last_busno = child->number;
159
160	dn->bussubno = child->number;
161
162	/* ioremap() for child bus, which may or may not succeed */
163	remap_bus_range(child);
164
165	return 0;
166	}
167
168	static struct pci_dev dlpar_pci_add_bus(struct device_node dn)
169	{
170	struct pci_controller *hose = dn->phb;
171	struct pci_dev *dev = NULL;
172
173	/* Scan phb bus for EADS device, adding new one to bus->devices */
174	if (!pci_scan_single_device(hose->bus, dn->devfn)) {
175	printk(KERN_ERR "%s: found no device on bus\n", __FUNCTION__);
176	return NULL;
177	}
178
179	/* Add new devices to global lists. Register in proc, sysfs. */
180	pci_bus_add_devices(hose->bus);
181
182	/* Confirm new bridge dev was created */
183	dev = rpaphp_find_pci_dev(dn);
184	if (!dev) {
185	printk(KERN_ERR "%s: failed to add pci device\n", __FUNCTION__);
186	return NULL;
187	}
188
189	if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
190	printk(KERN_ERR "%s: unexpected header type %d\n",
191	__FUNCTION__, dev->hdr_type);
192	return NULL;
193	}
194
195	if (pci_add_secondary_bus(dn, dev))
196	return NULL;
197
198	return dev;
199	}
200
201	static int dlpar_pci_remove_bus(struct pci_dev *bridge_dev)
202	{
203	struct pci_bus *secondary_bus;
204
205	if (!bridge_dev) {
206	printk(KERN_ERR "%s: unexpected null device\n",
207	__FUNCTION__);
208	return -EINVAL;
209	}
210
211	secondary_bus = bridge_dev->subordinate;
212
213	if (unmap_bus_range(secondary_bus)) {
214	printk(KERN_ERR "%s: failed to unmap bus range\n",
215	__FUNCTION__);
216	return -ERANGE;
217	}
218
219	pci_remove_bus_device(bridge_dev);
220	return 0;
221	}
222
223	static inline int dlpar_add_pci_slot(char drc_name, struct device_node dn)
224	{
225	struct pci_dev *dev;
226
227	/* Add pci bus */
228	dev = dlpar_pci_add_bus(dn);
229	if (!dev) {
230	printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__,
231	drc_name);
232	return -EIO;
233	}
234
5eeb8c63 JR	235	/* Add hotplug slot */
	236	if (rpaphp_add_slot(dn)) {
	237	printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
	238	__FUNCTION__, drc_name);
	239	return -EIO;
	240	}
1da177e4 LT	241	return 0;
	242	}
	243
	244	static int dlpar_remove_root_bus(struct pci_controller *phb)
	245	{
	246	struct pci_bus *phb_bus;
	247	int rc;
	248
	249	phb_bus = phb->bus;
	250	if (!(list_empty(&phb_bus->children) &&
	251	list_empty(&phb_bus->devices))) {
	252	return -EBUSY;
	253	}
	254
	255	rc = pcibios_remove_root_bus(phb);
	256	if (rc)
	257	return -EIO;
	258
	259	device_unregister(phb_bus->bridge);
	260	pci_remove_bus(phb_bus);
	261
	262	return 0;
	263	}
	264
	265	static int dlpar_remove_phb(struct slot *slot)
	266	{
	267	struct pci_controller *phb;
	268	struct device_node *dn;
	269	int rc = 0;
	270
	271	dn = slot->dn;
	272	if (!dn) {
	273	printk(KERN_ERR "%s: unexpected NULL slot device node\n",
	274	__FUNCTION__);
	275	return -EIO;
	276	}
	277
	278	phb = dn->phb;
	279	if (!phb) {
	280	printk(KERN_ERR "%s: unexpected NULL phb pointer\n",
	281	__FUNCTION__);
	282	return -EIO;
	283	}
	284
	285	if (rpaphp_remove_slot(slot)) {
	286	printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",
	287	__FUNCTION__, slot->location);
	288	return -EIO;
	289	}
	290
	291	rc = dlpar_remove_root_bus(phb);
	292	if (rc < 0)
	293	return rc;
	294
	295	return 0;
	296	}
	297
5eeb8c63	298	static int dlpar_add_phb(char drc_name, struct device_node dn)
1da177e4 LT	299	{
	300	struct pci_controller *phb;
	301
	302	phb = init_phb_dynamic(dn);
	303	if (!phb)
	304	return -EINVAL;
	305
5eeb8c63 JR	306	if (rpaphp_add_slot(dn)) {
	307	printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
	308	__FUNCTION__, drc_name);
	309	return -EIO;
	310	}
1da177e4 LT	311	return 0;
	312	}
	313
	314	/**
	315	* dlpar_add_slot - DLPAR add an I/O Slot
	316	* @drc_name: drc-name of newly added slot
	317	*
	318	* Make the hotplug module and the kernel aware
	319	* of a newly added I/O Slot.
	320	* Return Codes -
	321	* 0 Success
	322	* -ENODEV Not a valid drc_name
	323	* -EINVAL Slot already added
	324	* -ERESTARTSYS Signalled before obtaining lock
	325	* -EIO Internal PCI Error
	326	*/
	327	int dlpar_add_slot(char *drc_name)
	328	{
	329	struct device_node *dn = NULL;
	330	int node_type;
5eeb8c63	331	int rc;
1da177e4 LT	332
	333	if (down_interruptible(&rpadlpar_sem))
	334	return -ERESTARTSYS;
	335
	336	/* Check for existing hotplug slot */
	337	if (find_slot(drc_name)) {
	338	rc = -EINVAL;
	339	goto exit;
	340	}
	341
5eeb8c63 JR	342	/* Find newly added node */
5eeb8c63 JR	343	dn = find_dlpar_node(drc_name, &node_type);
1da177e4 LT	344	if (!dn) {
	345	rc = -ENODEV;
	346	goto exit;
	347	}
	348
5eeb8c63	349	rc = -EIO;
1da177e4 LT	350	switch (node_type) {
1da177e4 LT	351	case NODE_TYPE_VIO:
5eeb8c63 JR	352	if (!vio_register_device_node(dn)) {
	353	printk(KERN_ERR
	354	"%s: failed to register vio node %s\n",
	355	__FUNCTION__, drc_name);
	356	goto exit;
	357	}
1da177e4 LT	358	break;
	359	case NODE_TYPE_SLOT:
	360	rc = dlpar_add_pci_slot(drc_name, dn);
5eeb8c63 JR	361	if (rc)
5eeb8c63 JR	362	goto exit;
1da177e4 LT	363	break;
1da177e4 LT	364	case NODE_TYPE_PHB:
5eeb8c63 JR	365	rc = dlpar_add_phb(drc_name, dn);
	366	if (rc)
	367	goto exit;
1da177e4 LT	368	break;
	369	default:
	370	printk("%s: unexpected node type\n", __FUNCTION__);
5eeb8c63	371	goto exit;
1da177e4 LT	372	}
1da177e4 LT	373
5eeb8c63	374	rc = 0;
1da177e4 LT	375	exit:
	376	up(&rpadlpar_sem);
	377	return rc;
	378	}
	379
	380	/**
	381	* dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
	382	* @drc_name: drc-name of newly added slot
	383	*
	384	* Remove the kernel and hotplug representations
	385	* of an I/O Slot.
	386	* Return Codes:
	387	* 0 Success
	388	* -EIO Internal Error
	389	*/
5eeb8c63	390	static int dlpar_remove_vio_slot(struct device_node dn, char drc_name)
1da177e4	391	{
5eeb8c63	392	struct vio_dev *vio_dev;
1da177e4	393
5eeb8c63 JR	394	vio_dev = vio_find_node(dn);
	395	if (!vio_dev) {
	396	printk(KERN_ERR "%s: %s does not correspond to a vio dev\n",
	397	__FUNCTION__, drc_name);
1da177e4 LT	398	return -EIO;
1da177e4 LT	399	}
5eeb8c63 JR	400
5eeb8c63 JR	401	vio_unregister_device(vio_dev);
1da177e4 LT	402	return 0;
	403	}
	404
	405	/**
	406	* dlpar_remove_slot - DLPAR remove a PCI I/O Slot
	407	* @drc_name: drc-name of newly added slot
	408	*
	409	* Remove the kernel and hotplug representations
	410	* of a PCI I/O Slot.
	411	* Return Codes:
	412	* 0 Success
	413	* -ENODEV Not a valid drc_name
	414	* -EIO Internal PCI Error
	415	*/
	416	int dlpar_remove_pci_slot(struct slot slot, char drc_name)
	417	{
	418	struct pci_dev *bridge_dev;
	419
	420	bridge_dev = slot->bridge;
	421	if (!bridge_dev) {
	422	printk(KERN_ERR "%s: unexpected null bridge device\n",
	423	__FUNCTION__);
	424	return -EIO;
	425	}
	426
	427	/* Remove hotplug slot */
	428	if (rpaphp_remove_slot(slot)) {
	429	printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",
	430	__FUNCTION__, drc_name);
	431	return -EIO;
	432	}
	433
	434	/* Remove pci bus */
	435
	436	if (dlpar_pci_remove_bus(bridge_dev)) {
	437	printk(KERN_ERR "%s: unable to remove pci bus %s\n",
	438	__FUNCTION__, drc_name);
	439	return -EIO;
	440	}
	441	return 0;
	442	}
	443
	444	/**
	445	* dlpar_remove_slot - DLPAR remove an I/O Slot
	446	* @drc_name: drc-name of newly added slot
	447	*
	448	* Remove the kernel and hotplug representations
	449	* of an I/O Slot.
	450	* Return Codes:
	451	* 0 Success
	452	* -ENODEV Not a valid drc_name
	453	* -EINVAL Slot already removed
	454	* -ERESTARTSYS Signalled before obtaining lock
	455	* -EIO Internal Error
	456	*/
	457	int dlpar_remove_slot(char *drc_name)
	458	{
5eeb8c63	459	struct device_node *dn;
1da177e4	460	struct slot *slot;
5eeb8c63	461	int node_type;
1da177e4 LT	462	int rc = 0;
	463
	464	if (down_interruptible(&rpadlpar_sem))
	465	return -ERESTARTSYS;
	466
5eeb8c63 JR	467	dn = find_dlpar_node(drc_name, &node_type);
5eeb8c63 JR	468	if (!dn) {
1da177e4 LT	469	rc = -ENODEV;
	470	goto exit;
	471	}
	472
5eeb8c63 JR	473	if (node_type == NODE_TYPE_VIO) {
5eeb8c63 JR	474	rc = dlpar_remove_vio_slot(dn, drc_name);
1da177e4	475	} else {
5eeb8c63 JR	476	slot = find_slot(drc_name);
	477	if (!slot) {
	478	rc = -EINVAL;
	479	goto exit;
	480	}
1da177e4	481
5eeb8c63 JR	482	if (node_type == NODE_TYPE_PHB)
	483	rc = dlpar_remove_phb(slot);
	484	else {
	485	/* NODE_TYPE_SLOT */
	486	rc = dlpar_remove_pci_slot(slot, drc_name);
1da177e4 LT	487	}
	488	}
	489	exit:
	490	up(&rpadlpar_sem);
	491	return rc;
	492	}
	493
	494	static inline int is_dlpar_capable(void)
	495	{
	496	int rc = rtas_token("ibm,configure-connector");
	497
	498	return (int) (rc != RTAS_UNKNOWN_SERVICE);
	499	}
	500
	501	int __init rpadlpar_io_init(void)
	502	{
	503	int rc = 0;
	504
	505	if (!is_dlpar_capable()) {
	506	printk(KERN_WARNING "%s: partition not DLPAR capable\n",
	507	__FUNCTION__);
	508	return -EPERM;
	509	}
	510
	511	rc = dlpar_sysfs_init();
	512	return rc;
	513	}
	514
	515	void rpadlpar_io_exit(void)
	516	{
	517	dlpar_sysfs_exit();
	518	return;
	519	}
	520
	521	module_init(rpadlpar_io_init);
	522	module_exit(rpadlpar_io_exit);
	523	MODULE_LICENSE("GPL");