[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.
 */

#undef DEBUG

#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
 * @dn: target &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",
				__func__, dn->full_name);
		return;
	}

	/* Scan below the new bridge */
	if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
	    dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
		of_scan_pci_bridge(dn, dev);

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

	/* Finish adding it : resource allocation, adding devices, etc...
	 * Note that we need to perform the finish pass on the -parent-
	 * bus of the EADS bridge so the bridge device itself gets
	 * properly added
	 */
	pcibios_finish_adding_to_bus(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", __func__,
			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",
			__func__, 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",
			__func__, drc_name);
		return -EIO;
	}
	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 && rpaphp_deregister_slot(slot)) {
		printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",
		       __func__, drc_name);
		return -EIO;
	}

	pdn = dn->data;
	BUG_ON(!pdn || !pdn->phb);
	rc = remove_phb_dynamic(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",
			__func__, 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",
			__func__, 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
 * @dn: &device_node
 *
 * 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_pci_slot - DLPAR remove a PCI I/O Slot
 * @drc_name: drc-name of newly added slot
 * @dn: &device_node
 *
 * 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;

	pr_debug("PCI: Removing PCI slot below EADS bridge %s\n",
		 bus->self ? pci_name(bus->self) : "<!PHB!>");

	slot = find_php_slot(dn);
	if (slot) {
		pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n",
			 pci_domain_nr(bus), bus->number);

		if (rpaphp_deregister_slot(slot)) {
			printk(KERN_ERR
				"%s: unable to remove hotplug slot %s\n",
				__func__, drc_name);
			return -EIO;
		}
	}

	/* Remove all devices below slot */
	pcibios_remove_pci_devices(bus);

	/* Unmap PCI IO space */
	if (pcibios_unmap_io_space(bus)) {
		printk(KERN_ERR "%s: failed to unmap bus range\n",
			__func__);
		return -ERANGE;
	}

	/* Remove the EADS bridge device itself */
	BUG_ON(!bus->self);
	pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self));
	eeh_remove_bus_device(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",
			__func__);
		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	*/
fd6852c8 BH	17
	18	#undef DEBUG
	19
1da177e4 LT	20	#include <linux/init.h>
1da177e4 LT	21	#include <linux/pci.h>
4e57b681 TS	22	#include <linux/string.h>
4e57b681 TS	23
1da177e4	24	#include <asm/pci-bridge.h>
14cc3e2b	25	#include <linux/mutex.h>
1da177e4	26	#include <asm/rtas.h>
5eeb8c63	27	#include <asm/vio.h>
4e57b681	28
1da177e4 LT	29	#include "../pci.h"
	30	#include "rpaphp.h"
	31	#include "rpadlpar.h"
	32
14cc3e2b	33	static DEFINE_MUTEX(rpadlpar_mutex);
1da177e4	34
56d8456b JR	35	#define DLPAR_MODULE_NAME "rpadlpar_io"
56d8456b JR	36
1da177e4 LT	37	#define NODE_TYPE_VIO 1
	38	#define NODE_TYPE_SLOT 2
	39	#define NODE_TYPE_PHB 3
	40
5eeb8c63	41	static struct device_node find_vio_slot_node(char drc_name)
1da177e4	42	{
1da177e4	43	struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
5eeb8c63 JR	44	struct device_node *dn = NULL;
	45	char *name;
	46	int rc;
1da177e4 LT	47
	48	if (!parent)
	49	return NULL;
	50
5eeb8c63 JR	51	while ((dn = of_get_next_child(parent, dn))) {
	52	rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL);
	53	if ((rc == 0) && (!strcmp(drc_name, name)))
	54	break;
1da177e4 LT	55	}
1da177e4 LT	56
5eeb8c63	57	return dn;
1da177e4 LT	58	}
	59
	60	/* Find dlpar-capable pci node that contains the specified name and type */
	61	static struct device_node find_php_slot_pci_node(char drc_name,
	62	char *drc_type)
	63	{
	64	struct device_node *np = NULL;
	65	char *name;
	66	char *type;
	67	int rc;
	68
a57ed79e	69	while ((np = of_find_node_by_name(np, "pci"))) {
1da177e4 LT	70	rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL);
	71	if (rc == 0)
	72	if (!strcmp(drc_name, name) && !strcmp(drc_type, type))
	73	break;
	74	}
	75
	76	return np;
	77	}
	78
5eeb8c63	79	static struct device_node find_dlpar_node(char drc_name, int *node_type)
1da177e4 LT	80	{
	81	struct device_node *dn;
	82
	83	dn = find_php_slot_pci_node(drc_name, "SLOT");
	84	if (dn) {
	85	*node_type = NODE_TYPE_SLOT;
	86	return dn;
	87	}
	88
	89	dn = find_php_slot_pci_node(drc_name, "PHB");
	90	if (dn) {
	91	*node_type = NODE_TYPE_PHB;
	92	return dn;
	93	}
	94
5eeb8c63	95	dn = find_vio_slot_node(drc_name);
1da177e4 LT	96	if (dn) {
	97	*node_type = NODE_TYPE_VIO;
	98	return dn;
	99	}
	100
	101	return NULL;
	102	}
	103
8485d1a1 LV	104	/**
8485d1a1 LV	105	* find_php_slot - return hotplug slot structure for device node
26e6c66e	106	* @dn: target &device_node
8485d1a1 LV	107	*
	108	* This routine will return the hotplug slot structure
	109	* for a given device node. Note that built-in PCI slots
	110	* may be dlpar-able, but not hot-pluggable, so this routine
	111	* will return NULL for built-in PCI slots.
	112	*/
	113	static struct slot find_php_slot(struct device_node dn)
1da177e4 LT	114	{
	115	struct list_head tmp, n;
	116	struct slot *slot;
	117
8737d6a9	118	list_for_each_safe(tmp, n, &rpaphp_slot_head) {
	119	slot = list_entry(tmp, struct slot, rpaphp_slot_list);
	120	if (slot->dn == dn)
	121	return slot;
	122	}
1da177e4	123
8737d6a9	124	return NULL;
1da177e4 LT	125	}
1da177e4 LT	126
0945cd5f JR	127	static struct pci_dev dlpar_find_new_dev(struct pci_bus parent,
	128	struct device_node *dev_dn)
	129	{
	130	struct pci_dev *tmp = NULL;
	131	struct device_node *child_dn;
	132
	133	list_for_each_entry(tmp, &parent->devices, bus_list) {
	134	child_dn = pci_device_to_OF_node(tmp);
	135	if (child_dn == dev_dn)
	136	return tmp;
	137	}
	138	return NULL;
	139	}
	140
8737d6a9	141	static void dlpar_pci_add_bus(struct device_node *dn)
1da177e4	142	{
8737d6a9	143	struct pci_dn *pdn = PCI_DN(dn);
5fa80fcd	144	struct pci_controller *phb = pdn->phb;
1da177e4 LT	145	struct pci_dev *dev = NULL;
1da177e4 LT	146
d681db4a	147	eeh_add_device_tree_early(dn);
d681db4a	148
5fa80fcd JR	149	/* Add EADS device to PHB bus, adding new entry to bus->devices */
	150	dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
	151	if (!dev) {
	152	printk(KERN_ERR "%s: failed to create pci dev for %s\n",
66bef8c0	153	__func__, dn->full_name);
8737d6a9	154	return;
1da177e4 LT	155	}
1da177e4 LT	156
fd6852c8	157	/* Scan below the new bridge */
5fa80fcd JR	158	if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE \|\|
	159	dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
	160	of_scan_pci_bridge(dn, dev);
	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
fd6852c8 BH	165	/* Finish adding it : resource allocation, adding devices, etc...
	166	* Note that we need to perform the finish pass on the -parent-
	167	* bus of the EADS bridge so the bridge device itself gets
	168	* properly added
	169	*/
	170	pcibios_finish_adding_to_bus(phb->bus);
1da177e4 LT	171	}
1da177e4 LT	172
940903c5	173	static int dlpar_add_pci_slot(char drc_name, struct device_node dn)
1da177e4 LT	174	{
1da177e4 LT	175	struct pci_dev *dev;
8737d6a9	176	struct pci_controller *phb;
1da177e4	177
01657868	178	if (pcibios_find_pci_bus(dn))
56d8456b JR	179	return -EINVAL;
56d8456b JR	180
1da177e4	181	/* Add pci bus */
8737d6a9	182	dlpar_pci_add_bus(dn);
	183
	184	/* Confirm new bridge dev was created */
	185	phb = PCI_DN(dn)->phb;
	186	dev = dlpar_find_new_dev(phb->bus, dn);
	187
1da177e4	188	if (!dev) {
66bef8c0	189	printk(KERN_ERR "%s: unable to add bus %s\n", __func__,
1da177e4 LT	190	drc_name);
	191	return -EIO;
	192	}
	193
8737d6a9	194	if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
8737d6a9	195	printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n",
66bef8c0	196	__func__, dev->hdr_type, drc_name);
8737d6a9	197	return -EIO;
	198	}
	199
5eeb8c63 JR	200	/* Add hotplug slot */
	201	if (rpaphp_add_slot(dn)) {
	202	printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
66bef8c0	203	__func__, drc_name);
5eeb8c63 JR	204	return -EIO;
5eeb8c63 JR	205	}
1da177e4 LT	206	return 0;
	207	}
	208
56d8456b	209	static int dlpar_remove_phb(char drc_name, struct device_node dn)
1da177e4	210	{
56d8456b	211	struct slot *slot;
1635317f	212	struct pci_dn *pdn;
1da177e4 LT	213	int rc = 0;
1da177e4 LT	214
01657868	215	if (!pcibios_find_pci_bus(dn))
56d8456b	216	return -EINVAL;
1da177e4	217
8485d1a1 LV	218	/* If pci slot is hotplugable, use hotplug to remove it */
8485d1a1 LV	219	slot = find_php_slot(dn);
fd6852c8 BH	220	if (slot && rpaphp_deregister_slot(slot)) {
	221	printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",
	222	__func__, drc_name);
	223	return -EIO;
1da177e4 LT	224	}
1da177e4 LT	225
1635317f PM	226	pdn = dn->data;
1635317f PM	227	BUG_ON(!pdn \|\| !pdn->phb);
fd6852c8	228	rc = remove_phb_dynamic(pdn->phb);
1da177e4 LT	229	if (rc < 0)
	230	return rc;
	231
1635317f	232	pdn->phb = NULL;
56d8456b	233
1da177e4 LT	234	return 0;
	235	}
	236
5eeb8c63	237	static int dlpar_add_phb(char drc_name, struct device_node dn)
1da177e4 LT	238	{
	239	struct pci_controller *phb;
	240
fe98aeab	241	if (PCI_DN(dn) && PCI_DN(dn)->phb) {
56d8456b JR	242	/* PHB already exists */
	243	return -EINVAL;
	244	}
	245
1da177e4 LT	246	phb = init_phb_dynamic(dn);
1da177e4 LT	247	if (!phb)
56d8456b	248	return -EIO;
1da177e4	249
5eeb8c63 JR	250	if (rpaphp_add_slot(dn)) {
5eeb8c63 JR	251	printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
66bef8c0	252	__func__, drc_name);
5eeb8c63 JR	253	return -EIO;
5eeb8c63 JR	254	}
1da177e4 LT	255	return 0;
	256	}
	257
56d8456b JR	258	static int dlpar_add_vio_slot(char drc_name, struct device_node dn)
	259	{
	260	if (vio_find_node(dn))
	261	return -EINVAL;
	262
	263	if (!vio_register_device_node(dn)) {
	264	printk(KERN_ERR
	265	"%s: failed to register vio node %s\n",
66bef8c0	266	__func__, drc_name);
56d8456b JR	267	return -EIO;
	268	}
	269	return 0;
	270	}
	271
1da177e4 LT	272	/**
	273	* dlpar_add_slot - DLPAR add an I/O Slot
	274	* @drc_name: drc-name of newly added slot
	275	*
26e6c66e RD	276	* Make the hotplug module and the kernel aware of a newly added I/O Slot.
26e6c66e RD	277	* Return Codes:
1da177e4 LT	278	* 0 Success
	279	* -ENODEV Not a valid drc_name
	280	* -EINVAL Slot already added
	281	* -ERESTARTSYS Signalled before obtaining lock
	282	* -EIO Internal PCI Error
	283	*/
	284	int dlpar_add_slot(char *drc_name)
	285	{
	286	struct device_node *dn = NULL;
	287	int node_type;
56d8456b	288	int rc = -EIO;
1da177e4	289
14cc3e2b	290	if (mutex_lock_interruptible(&rpadlpar_mutex))
1da177e4 LT	291	return -ERESTARTSYS;
1da177e4 LT	292
5eeb8c63 JR	293	/* Find newly added node */
5eeb8c63 JR	294	dn = find_dlpar_node(drc_name, &node_type);
1da177e4 LT	295	if (!dn) {
	296	rc = -ENODEV;
	297	goto exit;
	298	}
	299
	300	switch (node_type) {
	301	case NODE_TYPE_VIO:
56d8456b	302	rc = dlpar_add_vio_slot(drc_name, dn);
1da177e4 LT	303	break;
	304	case NODE_TYPE_SLOT:
	305	rc = dlpar_add_pci_slot(drc_name, dn);
	306	break;
	307	case NODE_TYPE_PHB:
5eeb8c63	308	rc = dlpar_add_phb(drc_name, dn);
1da177e4	309	break;
1da177e4 LT	310	}
1da177e4 LT	311
56d8456b	312	printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
1da177e4	313	exit:
14cc3e2b	314	mutex_unlock(&rpadlpar_mutex);
1da177e4 LT	315	return rc;
	316	}
	317
	318	/**
	319	* dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
	320	* @drc_name: drc-name of newly added slot
26e6c66e	321	* @dn: &device_node
1da177e4	322	*
26e6c66e	323	* Remove the kernel and hotplug representations of an I/O Slot.
1da177e4 LT	324	* Return Codes:
1da177e4 LT	325	* 0 Success
56d8456b	326	* -EINVAL Vio dev doesn't exist
1da177e4	327	*/
56d8456b	328	static int dlpar_remove_vio_slot(char drc_name, struct device_node dn)
1da177e4	329	{
5eeb8c63	330	struct vio_dev *vio_dev;
1da177e4	331
5eeb8c63	332	vio_dev = vio_find_node(dn);
56d8456b JR	333	if (!vio_dev)
56d8456b JR	334	return -EINVAL;
5eeb8c63 JR	335
5eeb8c63 JR	336	vio_unregister_device(vio_dev);
1da177e4 LT	337	return 0;
	338	}
	339
	340	/**
26e6c66e	341	* dlpar_remove_pci_slot - DLPAR remove a PCI I/O Slot
1da177e4	342	* @drc_name: drc-name of newly added slot
26e6c66e	343	* @dn: &device_node
1da177e4	344	*
26e6c66e	345	* Remove the kernel and hotplug representations of a PCI I/O Slot.
1da177e4 LT	346	* Return Codes:
	347	* 0 Success
	348	* -ENODEV Not a valid drc_name
	349	* -EIO Internal PCI Error
	350	*/
56d8456b	351	int dlpar_remove_pci_slot(char drc_name, struct device_node dn)
1da177e4	352	{
56d8456b JR	353	struct pci_bus *bus;
56d8456b JR	354	struct slot *slot;
1da177e4	355
01657868	356	bus = pcibios_find_pci_bus(dn);
56d8456b JR	357	if (!bus)
	358	return -EINVAL;
	359
fd6852c8 BH	360	pr_debug("PCI: Removing PCI slot below EADS bridge %s\n",
	361	bus->self ? pci_name(bus->self) : "<!PHB!>");
	362
8485d1a1	363	slot = find_php_slot(dn);
56d8456b	364	if (slot) {
fd6852c8 BH	365	pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n",
	366	pci_domain_nr(bus), bus->number);
	367
f6afbad8	368	if (rpaphp_deregister_slot(slot)) {
56d8456b JR	369	printk(KERN_ERR
56d8456b JR	370	"%s: unable to remove hotplug slot %s\n",
66bef8c0	371	__func__, drc_name);
56d8456b JR	372	return -EIO;
56d8456b JR	373	}
fd6852c8 BH	374	}
	375
	376	/* Remove all devices below slot */
	377	pcibios_remove_pci_devices(bus);
1da177e4	378
fd6852c8	379	/* Unmap PCI IO space */
3d5134ee	380	if (pcibios_unmap_io_space(bus)) {
9c209c91	381	printk(KERN_ERR "%s: failed to unmap bus range\n",
66bef8c0	382	__func__);
9c209c91	383	return -ERANGE;
1da177e4	384	}
9c209c91	385
fd6852c8	386	/* Remove the EADS bridge device itself */
9c209c91	387	BUG_ON(!bus->self);
fd6852c8 BH	388	pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self));
fd6852c8 BH	389	eeh_remove_bus_device(bus->self);
9c209c91	390	pci_remove_bus_device(bus->self);
fd6852c8	391
1da177e4 LT	392	return 0;
	393	}
	394
	395	/**
	396	* dlpar_remove_slot - DLPAR remove an I/O Slot
	397	* @drc_name: drc-name of newly added slot
	398	*
26e6c66e	399	* Remove the kernel and hotplug representations of an I/O Slot.
1da177e4 LT	400	* Return Codes:
	401	* 0 Success
	402	* -ENODEV Not a valid drc_name
	403	* -EINVAL Slot already removed
	404	* -ERESTARTSYS Signalled before obtaining lock
	405	* -EIO Internal Error
	406	*/
	407	int dlpar_remove_slot(char *drc_name)
	408	{
5eeb8c63	409	struct device_node *dn;
5eeb8c63	410	int node_type;
1da177e4 LT	411	int rc = 0;
1da177e4 LT	412
14cc3e2b	413	if (mutex_lock_interruptible(&rpadlpar_mutex))
1da177e4 LT	414	return -ERESTARTSYS;
1da177e4 LT	415
5eeb8c63 JR	416	dn = find_dlpar_node(drc_name, &node_type);
5eeb8c63 JR	417	if (!dn) {
1da177e4 LT	418	rc = -ENODEV;
	419	goto exit;
	420	}
	421
56d8456b JR	422	switch (node_type) {
	423	case NODE_TYPE_VIO:
	424	rc = dlpar_remove_vio_slot(drc_name, dn);
	425	break;
	426	case NODE_TYPE_PHB:
	427	rc = dlpar_remove_phb(drc_name, dn);
	428	break;
	429	case NODE_TYPE_SLOT:
	430	rc = dlpar_remove_pci_slot(drc_name, dn);
	431	break;
1da177e4	432	}
56d8456b	433	printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
1da177e4	434	exit:
14cc3e2b	435	mutex_unlock(&rpadlpar_mutex);
1da177e4 LT	436	return rc;
	437	}
	438
	439	static inline int is_dlpar_capable(void)
	440	{
	441	int rc = rtas_token("ibm,configure-connector");
	442
	443	return (int) (rc != RTAS_UNKNOWN_SERVICE);
	444	}
	445
	446	int __init rpadlpar_io_init(void)
	447	{
	448	int rc = 0;
	449
	450	if (!is_dlpar_capable()) {
	451	printk(KERN_WARNING "%s: partition not DLPAR capable\n",
66bef8c0	452	__func__);
1da177e4 LT	453	return -EPERM;
	454	}
	455
	456	rc = dlpar_sysfs_init();
	457	return rc;
	458	}
	459
	460	void rpadlpar_io_exit(void)
	461	{
	462	dlpar_sysfs_exit();
	463	return;
	464	}
	465
	466	module_init(rpadlpar_io_init);
	467	module_exit(rpadlpar_io_exit);
	468	MODULE_LICENSE("GPL");