[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 <linux/string.h>

#include <asm/pci-bridge.h>
#include <linux/mutex.h>
#include <asm/rtas.h>
#include <asm/vio.h>

#include "../pci.h"
#include "rpaphp.h"
#include "rpadlpar.h"

static DEFINE_MUTEX(rpadlpar_mutex);

#define DLPAR_MODULE_NAME "rpadlpar_io"

#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_name(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;
}

/**
 * find_php_slot - return hotplug slot structure for device node
 *
 * This routine will return the hotplug slot structure
 * for a given device node. Note that built-in PCI slots
 * may be dlpar-able, but not hot-pluggable, so this routine
 * will return NULL for built-in PCI slots.
 */
static struct slot *find_php_slot(struct device_node *dn)
{
	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 (slot->dn == dn)
			return slot;
	}

	return NULL;
}

static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
					struct device_node *dev_dn)
{
	struct pci_dev *tmp = NULL;
	struct device_node *child_dn;

	list_for_each_entry(tmp, &parent->devices, bus_list) {
		child_dn = pci_device_to_OF_node(tmp);
		if (child_dn == dev_dn)
			return tmp;
	}
	return NULL;
}

static void dlpar_pci_add_bus(struct device_node *dn)
{
	struct pci_dn *pdn = PCI_DN(dn);
	struct pci_controller *phb = pdn->phb;
	struct pci_dev *dev = NULL;

	eeh_add_device_tree_early(dn);

	/* Add EADS device to PHB bus, adding new entry to bus->devices */
	dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
	if (!dev) {
		printk(KERN_ERR "%s: failed to create pci dev for %s\n",
				__FUNCTION__, dn->full_name);
		return;
	}

	if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
	    dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
		of_scan_pci_bridge(dn, dev);

	pcibios_fixup_new_pci_devices(dev->subordinate,0);

	/* Claim new bus resources */
	pcibios_claim_one_bus(dev->bus);

	/* Map IO space for child bus, which may or may not succeed */
	pcibios_map_io_space(dev->subordinate);

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

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

	if (pcibios_find_pci_bus(dn))
		return -EINVAL;

	/* Add pci bus */
	dlpar_pci_add_bus(dn);

	/* Confirm new bridge dev was created */
	phb = PCI_DN(dn)->phb;
	dev = dlpar_find_new_dev(phb->bus, dn);

	if (!dev) {
		printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__,
			drc_name);
		return -EIO;
	}

	if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
		printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n",
			__FUNCTION__, dev->hdr_type, 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(char *drc_name, struct device_node *dn)
{
	struct slot *slot;
	struct pci_dn *pdn;
	int rc = 0;

	if (!pcibios_find_pci_bus(dn))
		return -EINVAL;

	/* If pci slot is hotplugable, use hotplug to remove it */
	slot = find_php_slot(dn);
	if (slot) {
		if (rpaphp_deregister_slot(slot)) {
			printk(KERN_ERR
				"%s: unable to remove hotplug slot %s\n",
				__FUNCTION__, drc_name);
			return -EIO;
		}
	}

	pdn = dn->data;
	BUG_ON(!pdn || !pdn->phb);
	rc = dlpar_remove_root_bus(pdn->phb);
	if (rc < 0)
		return rc;

	pdn->phb = NULL;

	return 0;
}

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

	if (PCI_DN(dn) && PCI_DN(dn)->phb) {
		/* PHB already exists */
		return -EINVAL;
	}

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

	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_add_vio_slot(char *drc_name, struct device_node *dn)
{
	if (vio_find_node(dn))
		return -EINVAL;

	if (!vio_register_device_node(dn)) {
		printk(KERN_ERR
			"%s: failed to register vio node %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 = -EIO;

	if (mutex_lock_interruptible(&rpadlpar_mutex))
		return -ERESTARTSYS;

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

	switch (node_type) {
		case NODE_TYPE_VIO:
			rc = dlpar_add_vio_slot(drc_name, dn);
			break;
		case NODE_TYPE_SLOT:
			rc = dlpar_add_pci_slot(drc_name, dn);
			break;
		case NODE_TYPE_PHB:
			rc = dlpar_add_phb(drc_name, dn);
			break;
	}

	printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
exit:
	mutex_unlock(&rpadlpar_mutex);
	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
 * -EINVAL		Vio dev doesn't exist
 */
static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
{
	struct vio_dev *vio_dev;

	vio_dev = vio_find_node(dn);
	if (!vio_dev)
		return -EINVAL;

	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(char *drc_name, struct device_node *dn)
{
	struct pci_bus *bus;
	struct slot *slot;

	bus = pcibios_find_pci_bus(dn);
	if (!bus)
		return -EINVAL;

	/* If pci slot is hotplugable, use hotplug to remove it */
	slot = find_php_slot(dn);
	if (slot) {
		if (rpaphp_deregister_slot(slot)) {
			printk(KERN_ERR
				"%s: unable to remove hotplug slot %s\n",
				__FUNCTION__, drc_name);
			return -EIO;
		}
	} else
		pcibios_remove_pci_devices(bus);

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

	BUG_ON(!bus->self);
	pci_remove_bus_device(bus->self);
	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;
	int node_type;
	int rc = 0;

	if (mutex_lock_interruptible(&rpadlpar_mutex))
		return -ERESTARTSYS;

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

	switch (node_type) {
		case NODE_TYPE_VIO:
			rc = dlpar_remove_vio_slot(drc_name, dn);
			break;
		case NODE_TYPE_PHB:
			rc = dlpar_remove_phb(drc_name, dn);
			break;
		case NODE_TYPE_SLOT:
			rc = dlpar_remove_pci_slot(drc_name, dn);
			break;
	}
	printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
exit:
	mutex_unlock(&rpadlpar_mutex);
	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>
4e57b681 TS	19	#include <linux/string.h>
4e57b681 TS	20
1da177e4	21	#include <asm/pci-bridge.h>
14cc3e2b	22	#include <linux/mutex.h>
1da177e4	23	#include <asm/rtas.h>
5eeb8c63	24	#include <asm/vio.h>
4e57b681	25
1da177e4 LT	26	#include "../pci.h"
	27	#include "rpaphp.h"
	28	#include "rpadlpar.h"
	29
14cc3e2b	30	static DEFINE_MUTEX(rpadlpar_mutex);
1da177e4	31
56d8456b JR	32	#define DLPAR_MODULE_NAME "rpadlpar_io"
56d8456b JR	33
1da177e4 LT	34	#define NODE_TYPE_VIO 1
	35	#define NODE_TYPE_SLOT 2
	36	#define NODE_TYPE_PHB 3
	37
5eeb8c63	38	static struct device_node find_vio_slot_node(char drc_name)
1da177e4	39	{
1da177e4	40	struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
5eeb8c63 JR	41	struct device_node *dn = NULL;
	42	char *name;
	43	int rc;
1da177e4 LT	44
	45	if (!parent)
	46	return NULL;
	47
5eeb8c63 JR	48	while ((dn = of_get_next_child(parent, dn))) {
	49	rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL);
	50	if ((rc == 0) && (!strcmp(drc_name, name)))
	51	break;
1da177e4 LT	52	}
1da177e4 LT	53
5eeb8c63	54	return dn;
1da177e4 LT	55	}
	56
	57	/* Find dlpar-capable pci node that contains the specified name and type */
	58	static struct device_node find_php_slot_pci_node(char drc_name,
	59	char *drc_type)
	60	{
	61	struct device_node *np = NULL;
	62	char *name;
	63	char *type;
	64	int rc;
	65
a57ed79e	66	while ((np = of_find_node_by_name(np, "pci"))) {
1da177e4 LT	67	rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL);
	68	if (rc == 0)
	69	if (!strcmp(drc_name, name) && !strcmp(drc_type, type))
	70	break;
	71	}
	72
	73	return np;
	74	}
	75
5eeb8c63	76	static struct device_node find_dlpar_node(char drc_name, int *node_type)
1da177e4 LT	77	{
	78	struct device_node *dn;
	79
	80	dn = find_php_slot_pci_node(drc_name, "SLOT");
	81	if (dn) {
	82	*node_type = NODE_TYPE_SLOT;
	83	return dn;
	84	}
	85
	86	dn = find_php_slot_pci_node(drc_name, "PHB");
	87	if (dn) {
	88	*node_type = NODE_TYPE_PHB;
	89	return dn;
	90	}
	91
5eeb8c63	92	dn = find_vio_slot_node(drc_name);
1da177e4 LT	93	if (dn) {
	94	*node_type = NODE_TYPE_VIO;
	95	return dn;
	96	}
	97
	98	return NULL;
	99	}
	100
8485d1a1 LV	101	/**
	102	* find_php_slot - return hotplug slot structure for device node
	103	*
	104	* This routine will return the hotplug slot structure
	105	* for a given device node. Note that built-in PCI slots
	106	* may be dlpar-able, but not hot-pluggable, so this routine
	107	* will return NULL for built-in PCI slots.
	108	*/
	109	static struct slot find_php_slot(struct device_node dn)
1da177e4 LT	110	{
	111	struct list_head tmp, n;
	112	struct slot *slot;
	113
8737d6a9	114	list_for_each_safe(tmp, n, &rpaphp_slot_head) {
	115	slot = list_entry(tmp, struct slot, rpaphp_slot_list);
	116	if (slot->dn == dn)
	117	return slot;
	118	}
1da177e4	119
8737d6a9	120	return NULL;
1da177e4 LT	121	}
1da177e4 LT	122
0945cd5f JR	123	static struct pci_dev dlpar_find_new_dev(struct pci_bus parent,
	124	struct device_node *dev_dn)
	125	{
	126	struct pci_dev *tmp = NULL;
	127	struct device_node *child_dn;
	128
	129	list_for_each_entry(tmp, &parent->devices, bus_list) {
	130	child_dn = pci_device_to_OF_node(tmp);
	131	if (child_dn == dev_dn)
	132	return tmp;
	133	}
	134	return NULL;
	135	}
	136
8737d6a9	137	static void dlpar_pci_add_bus(struct device_node *dn)
1da177e4	138	{
8737d6a9	139	struct pci_dn *pdn = PCI_DN(dn);
5fa80fcd	140	struct pci_controller *phb = pdn->phb;
1da177e4 LT	141	struct pci_dev *dev = NULL;
1da177e4 LT	142
d681db4a	143	eeh_add_device_tree_early(dn);
d681db4a	144
5fa80fcd JR	145	/* Add EADS device to PHB bus, adding new entry to bus->devices */
	146	dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
	147	if (!dev) {
	148	printk(KERN_ERR "%s: failed to create pci dev for %s\n",
	149	__FUNCTION__, dn->full_name);
8737d6a9	150	return;
1da177e4 LT	151	}
1da177e4 LT	152
5fa80fcd JR	153	if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE \|\|
	154	dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
	155	of_scan_pci_bridge(dn, dev);
	156
eca845c7	157	pcibios_fixup_new_pci_devices(dev->subordinate,0);
5fa80fcd JR	158
5fa80fcd JR	159	/* Claim new bus resources */
cd5b50be	160	pcibios_claim_one_bus(dev->bus);
5fa80fcd	161
3d5134ee BH	162	/* Map IO space for child bus, which may or may not succeed */
3d5134ee BH	163	pcibios_map_io_space(dev->subordinate);
5fa80fcd	164
1da177e4	165	/* Add new devices to global lists. Register in proc, sysfs. */
5fa80fcd	166	pci_bus_add_devices(phb->bus);
1da177e4 LT	167	}
1da177e4 LT	168
940903c5	169	static int dlpar_add_pci_slot(char drc_name, struct device_node dn)
1da177e4 LT	170	{
1da177e4 LT	171	struct pci_dev *dev;
8737d6a9	172	struct pci_controller *phb;
1da177e4	173
01657868	174	if (pcibios_find_pci_bus(dn))
56d8456b JR	175	return -EINVAL;
56d8456b JR	176
1da177e4	177	/* Add pci bus */
8737d6a9	178	dlpar_pci_add_bus(dn);
	179
	180	/* Confirm new bridge dev was created */
	181	phb = PCI_DN(dn)->phb;
	182	dev = dlpar_find_new_dev(phb->bus, dn);
	183
1da177e4 LT	184	if (!dev) {
	185	printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__,
	186	drc_name);
	187	return -EIO;
	188	}
	189
8737d6a9	190	if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
	191	printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n",
	192	__FUNCTION__, dev->hdr_type, drc_name);
	193	return -EIO;
	194	}
	195
5eeb8c63 JR	196	/* Add hotplug slot */
	197	if (rpaphp_add_slot(dn)) {
	198	printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
	199	__FUNCTION__, drc_name);
	200	return -EIO;
	201	}
1da177e4 LT	202	return 0;
	203	}
	204
	205	static int dlpar_remove_root_bus(struct pci_controller *phb)
	206	{
	207	struct pci_bus *phb_bus;
	208	int rc;
	209
	210	phb_bus = phb->bus;
	211	if (!(list_empty(&phb_bus->children) &&
	212	list_empty(&phb_bus->devices))) {
	213	return -EBUSY;
	214	}
	215
	216	rc = pcibios_remove_root_bus(phb);
	217	if (rc)
	218	return -EIO;
	219
	220	device_unregister(phb_bus->bridge);
	221	pci_remove_bus(phb_bus);
	222
	223	return 0;
	224	}
	225
56d8456b	226	static int dlpar_remove_phb(char drc_name, struct device_node dn)
1da177e4	227	{
56d8456b	228	struct slot *slot;
1635317f	229	struct pci_dn *pdn;
1da177e4 LT	230	int rc = 0;
1da177e4 LT	231
01657868	232	if (!pcibios_find_pci_bus(dn))
56d8456b	233	return -EINVAL;
1da177e4	234
8485d1a1 LV	235	/* If pci slot is hotplugable, use hotplug to remove it */
8485d1a1 LV	236	slot = find_php_slot(dn);
56d8456b	237	if (slot) {
f6afbad8	238	if (rpaphp_deregister_slot(slot)) {
56d8456b JR	239	printk(KERN_ERR
	240	"%s: unable to remove hotplug slot %s\n",
	241	__FUNCTION__, drc_name);
	242	return -EIO;
	243	}
1da177e4 LT	244	}
1da177e4 LT	245
1635317f PM	246	pdn = dn->data;
	247	BUG_ON(!pdn \|\| !pdn->phb);
	248	rc = dlpar_remove_root_bus(pdn->phb);
1da177e4 LT	249	if (rc < 0)
	250	return rc;
	251
1635317f	252	pdn->phb = NULL;
56d8456b	253
1da177e4 LT	254	return 0;
	255	}
	256
5eeb8c63	257	static int dlpar_add_phb(char drc_name, struct device_node dn)
1da177e4 LT	258	{
	259	struct pci_controller *phb;
	260
fe98aeab	261	if (PCI_DN(dn) && PCI_DN(dn)->phb) {
56d8456b JR	262	/* PHB already exists */
	263	return -EINVAL;
	264	}
	265
1da177e4 LT	266	phb = init_phb_dynamic(dn);
1da177e4 LT	267	if (!phb)
56d8456b	268	return -EIO;
1da177e4	269
5eeb8c63 JR	270	if (rpaphp_add_slot(dn)) {
	271	printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
	272	__FUNCTION__, drc_name);
	273	return -EIO;
	274	}
1da177e4 LT	275	return 0;
	276	}
	277
56d8456b JR	278	static int dlpar_add_vio_slot(char drc_name, struct device_node dn)
	279	{
	280	if (vio_find_node(dn))
	281	return -EINVAL;
	282
	283	if (!vio_register_device_node(dn)) {
	284	printk(KERN_ERR
	285	"%s: failed to register vio node %s\n",
	286	__FUNCTION__, drc_name);
	287	return -EIO;
	288	}
	289	return 0;
	290	}
	291
1da177e4 LT	292	/**
	293	* dlpar_add_slot - DLPAR add an I/O Slot
	294	* @drc_name: drc-name of newly added slot
	295	*
	296	* Make the hotplug module and the kernel aware
	297	* of a newly added I/O Slot.
	298	* Return Codes -
	299	* 0 Success
	300	* -ENODEV Not a valid drc_name
	301	* -EINVAL Slot already added
	302	* -ERESTARTSYS Signalled before obtaining lock
	303	* -EIO Internal PCI Error
	304	*/
	305	int dlpar_add_slot(char *drc_name)
	306	{
	307	struct device_node *dn = NULL;
	308	int node_type;
56d8456b	309	int rc = -EIO;
1da177e4	310
14cc3e2b	311	if (mutex_lock_interruptible(&rpadlpar_mutex))
1da177e4 LT	312	return -ERESTARTSYS;
1da177e4 LT	313
5eeb8c63 JR	314	/* Find newly added node */
5eeb8c63 JR	315	dn = find_dlpar_node(drc_name, &node_type);
1da177e4 LT	316	if (!dn) {
	317	rc = -ENODEV;
	318	goto exit;
	319	}
	320
	321	switch (node_type) {
	322	case NODE_TYPE_VIO:
56d8456b	323	rc = dlpar_add_vio_slot(drc_name, dn);
1da177e4 LT	324	break;
	325	case NODE_TYPE_SLOT:
	326	rc = dlpar_add_pci_slot(drc_name, dn);
	327	break;
	328	case NODE_TYPE_PHB:
5eeb8c63	329	rc = dlpar_add_phb(drc_name, dn);
1da177e4	330	break;
1da177e4 LT	331	}
1da177e4 LT	332
56d8456b	333	printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
1da177e4	334	exit:
14cc3e2b	335	mutex_unlock(&rpadlpar_mutex);
1da177e4 LT	336	return rc;
	337	}
	338
	339	/**
	340	* dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
	341	* @drc_name: drc-name of newly added slot
	342	*
	343	* Remove the kernel and hotplug representations
	344	* of an I/O Slot.
	345	* Return Codes:
	346	* 0 Success
56d8456b	347	* -EINVAL Vio dev doesn't exist
1da177e4	348	*/
56d8456b	349	static int dlpar_remove_vio_slot(char drc_name, struct device_node dn)
1da177e4	350	{
5eeb8c63	351	struct vio_dev *vio_dev;
1da177e4	352
5eeb8c63	353	vio_dev = vio_find_node(dn);
56d8456b JR	354	if (!vio_dev)
56d8456b JR	355	return -EINVAL;
5eeb8c63 JR	356
5eeb8c63 JR	357	vio_unregister_device(vio_dev);
1da177e4 LT	358	return 0;
	359	}
	360
	361	/**
	362	* dlpar_remove_slot - DLPAR remove a PCI I/O Slot
	363	* @drc_name: drc-name of newly added slot
	364	*
	365	* Remove the kernel and hotplug representations
	366	* of a PCI I/O Slot.
	367	* Return Codes:
	368	* 0 Success
	369	* -ENODEV Not a valid drc_name
	370	* -EIO Internal PCI Error
	371	*/
56d8456b	372	int dlpar_remove_pci_slot(char drc_name, struct device_node dn)
1da177e4	373	{
56d8456b JR	374	struct pci_bus *bus;
56d8456b JR	375	struct slot *slot;
1da177e4	376
01657868	377	bus = pcibios_find_pci_bus(dn);
56d8456b JR	378	if (!bus)
	379	return -EINVAL;
	380
8485d1a1 LV	381	/* If pci slot is hotplugable, use hotplug to remove it */
8485d1a1 LV	382	slot = find_php_slot(dn);
56d8456b	383	if (slot) {
f6afbad8	384	if (rpaphp_deregister_slot(slot)) {
56d8456b JR	385	printk(KERN_ERR
	386	"%s: unable to remove hotplug slot %s\n",
	387	__FUNCTION__, drc_name);
	388	return -EIO;
	389	}
b5661479 LV	390	} else
b5661479 LV	391	pcibios_remove_pci_devices(bus);
1da177e4	392
3d5134ee	393	if (pcibios_unmap_io_space(bus)) {
9c209c91 JR	394	printk(KERN_ERR "%s: failed to unmap bus range\n",
	395	__FUNCTION__);
	396	return -ERANGE;
1da177e4	397	}
9c209c91 JR	398
	399	BUG_ON(!bus->self);
	400	pci_remove_bus_device(bus->self);
1da177e4 LT	401	return 0;
	402	}
	403
	404	/**
	405	* dlpar_remove_slot - DLPAR remove an I/O Slot
	406	* @drc_name: drc-name of newly added slot
	407	*
	408	* Remove the kernel and hotplug representations
	409	* of an I/O Slot.
	410	* Return Codes:
	411	* 0 Success
	412	* -ENODEV Not a valid drc_name
	413	* -EINVAL Slot already removed
	414	* -ERESTARTSYS Signalled before obtaining lock
	415	* -EIO Internal Error
	416	*/
	417	int dlpar_remove_slot(char *drc_name)
	418	{
5eeb8c63	419	struct device_node *dn;
5eeb8c63	420	int node_type;
1da177e4 LT	421	int rc = 0;
1da177e4 LT	422
14cc3e2b	423	if (mutex_lock_interruptible(&rpadlpar_mutex))
1da177e4 LT	424	return -ERESTARTSYS;
1da177e4 LT	425
5eeb8c63 JR	426	dn = find_dlpar_node(drc_name, &node_type);
5eeb8c63 JR	427	if (!dn) {
1da177e4 LT	428	rc = -ENODEV;
	429	goto exit;
	430	}
	431
56d8456b JR	432	switch (node_type) {
	433	case NODE_TYPE_VIO:
	434	rc = dlpar_remove_vio_slot(drc_name, dn);
	435	break;
	436	case NODE_TYPE_PHB:
	437	rc = dlpar_remove_phb(drc_name, dn);
	438	break;
	439	case NODE_TYPE_SLOT:
	440	rc = dlpar_remove_pci_slot(drc_name, dn);
	441	break;
1da177e4	442	}
56d8456b	443	printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
1da177e4	444	exit:
14cc3e2b	445	mutex_unlock(&rpadlpar_mutex);
1da177e4 LT	446	return rc;
	447	}
	448
	449	static inline int is_dlpar_capable(void)
	450	{
	451	int rc = rtas_token("ibm,configure-connector");
	452
	453	return (int) (rc != RTAS_UNKNOWN_SERVICE);
	454	}
	455
	456	int __init rpadlpar_io_init(void)
	457	{
	458	int rc = 0;
	459
	460	if (!is_dlpar_capable()) {
	461	printk(KERN_WARNING "%s: partition not DLPAR capable\n",
	462	__FUNCTION__);
	463	return -EPERM;
	464	}
	465
	466	rc = dlpar_sysfs_init();
	467	return rc;
	468	}
	469
	470	void rpadlpar_io_exit(void)
	471	{
	472	dlpar_sysfs_exit();
	473	return;
	474	}
	475
	476	module_init(rpadlpar_io_init);
	477	module_exit(rpadlpar_io_exit);
	478	MODULE_LICENSE("GPL");