[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/module.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/vmalloc.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 slot *slot, *next;

	list_for_each_entry_safe(slot, next, &rpaphp_slot_head,
				 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(pdn);

	/* 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 (pci_is_bridge(dev))
		of_scan_pci_bridge(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 hotpluggable, 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;
	int ret = 0;

	pci_lock_rescan_remove();

	bus = pcibios_find_pci_bus(dn);
	if (!bus) {
		ret = -EINVAL;
		goto out;
	}

	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);
			ret = -EIO;
			goto out;
		}
	}

	/* 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__);
		ret = -ERANGE;
		goto out;
	}

	/* Remove the EADS bridge device itself */
	BUG_ON(!bus->self);
	pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self));
	pci_stop_and_remove_bus_device(bus->self);

 out:
	pci_unlock_rescan_remove();
	return ret;
}

/**
 * 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;
	}
	vm_unmap_aliases();

	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	20	#include <linux/init.h>
eefa9cfc	21	#include <linux/module.h>
1da177e4	22	#include <linux/pci.h>
4e57b681	23	#include <linux/string.h>
b4a26be9	24	#include <linux/vmalloc.h>
4e57b681	25
1da177e4	26	#include <asm/pci-bridge.h>
14cc3e2b	27	#include <linux/mutex.h>
1da177e4	28	#include <asm/rtas.h>
5eeb8c63	29	#include <asm/vio.h>
4e57b681	30
1da177e4 LT	31	#include "../pci.h"
	32	#include "rpaphp.h"
	33	#include "rpadlpar.h"
	34
14cc3e2b	35	static DEFINE_MUTEX(rpadlpar_mutex);
1da177e4	36
56d8456b JR	37	#define DLPAR_MODULE_NAME "rpadlpar_io"
56d8456b JR	38
1da177e4 LT	39	#define NODE_TYPE_VIO 1
	40	#define NODE_TYPE_SLOT 2
	41	#define NODE_TYPE_PHB 3
	42
5eeb8c63	43	static struct device_node find_vio_slot_node(char drc_name)
1da177e4	44	{
1da177e4	45	struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
5eeb8c63 JR	46	struct device_node *dn = NULL;
	47	char *name;
	48	int rc;
1da177e4 LT	49
	50	if (!parent)
	51	return NULL;
	52
5eeb8c63 JR	53	while ((dn = of_get_next_child(parent, dn))) {
	54	rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL);
	55	if ((rc == 0) && (!strcmp(drc_name, name)))
	56	break;
1da177e4 LT	57	}
1da177e4 LT	58
5eeb8c63	59	return dn;
1da177e4 LT	60	}
	61
	62	/* Find dlpar-capable pci node that contains the specified name and type */
	63	static struct device_node find_php_slot_pci_node(char drc_name,
	64	char *drc_type)
	65	{
	66	struct device_node *np = NULL;
	67	char *name;
	68	char *type;
	69	int rc;
	70
a57ed79e	71	while ((np = of_find_node_by_name(np, "pci"))) {
1da177e4 LT	72	rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL);
	73	if (rc == 0)
	74	if (!strcmp(drc_name, name) && !strcmp(drc_type, type))
	75	break;
	76	}
	77
	78	return np;
	79	}
	80
5eeb8c63	81	static struct device_node find_dlpar_node(char drc_name, int *node_type)
1da177e4 LT	82	{
	83	struct device_node *dn;
	84
	85	dn = find_php_slot_pci_node(drc_name, "SLOT");
	86	if (dn) {
	87	*node_type = NODE_TYPE_SLOT;
	88	return dn;
	89	}
	90
	91	dn = find_php_slot_pci_node(drc_name, "PHB");
	92	if (dn) {
	93	*node_type = NODE_TYPE_PHB;
	94	return dn;
	95	}
	96
5eeb8c63	97	dn = find_vio_slot_node(drc_name);
1da177e4 LT	98	if (dn) {
	99	*node_type = NODE_TYPE_VIO;
	100	return dn;
	101	}
	102
	103	return NULL;
	104	}
	105
8485d1a1 LV	106	/**
8485d1a1 LV	107	* find_php_slot - return hotplug slot structure for device node
26e6c66e	108	* @dn: target &device_node
8485d1a1 LV	109	*
	110	* This routine will return the hotplug slot structure
	111	* for a given device node. Note that built-in PCI slots
	112	* may be dlpar-able, but not hot-pluggable, so this routine
	113	* will return NULL for built-in PCI slots.
	114	*/
	115	static struct slot find_php_slot(struct device_node dn)
1da177e4	116	{
2ac83ccc	117	struct slot slot, next;
1da177e4	118
2ac83ccc GT	119	list_for_each_entry_safe(slot, next, &rpaphp_slot_head,
2ac83ccc GT	120	rpaphp_slot_list) {
8737d6a9	121	if (slot->dn == dn)
	122	return slot;
	123	}
1da177e4	124
8737d6a9	125	return NULL;
1da177e4 LT	126	}
1da177e4 LT	127
0945cd5f JR	128	static struct pci_dev dlpar_find_new_dev(struct pci_bus parent,
	129	struct device_node *dev_dn)
	130	{
	131	struct pci_dev *tmp = NULL;
	132	struct device_node *child_dn;
	133
	134	list_for_each_entry(tmp, &parent->devices, bus_list) {
	135	child_dn = pci_device_to_OF_node(tmp);
	136	if (child_dn == dev_dn)
	137	return tmp;
	138	}
	139	return NULL;
	140	}
	141
8737d6a9	142	static void dlpar_pci_add_bus(struct device_node *dn)
1da177e4	143	{
8737d6a9	144	struct pci_dn *pdn = PCI_DN(dn);
5fa80fcd	145	struct pci_controller *phb = pdn->phb;
1da177e4 LT	146	struct pci_dev *dev = NULL;
1da177e4 LT	147
ff57b454	148	eeh_add_device_tree_early(pdn);
d681db4a	149
5fa80fcd JR	150	/* Add EADS device to PHB bus, adding new entry to bus->devices */
	151	dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
	152	if (!dev) {
	153	printk(KERN_ERR "%s: failed to create pci dev for %s\n",
66bef8c0	154	__func__, dn->full_name);
8737d6a9	155	return;
1da177e4 LT	156	}
1da177e4 LT	157
fd6852c8	158	/* Scan below the new bridge */
f86e1f15	159	if (pci_is_bridge(dev))
98d9f30c	160	of_scan_pci_bridge(dev);
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
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
f7625980	218	/* If pci slot is hotpluggable, use hotplug to remove it */
8485d1a1	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;
c4ec84c7 RW	355	int ret = 0;
	356
	357	pci_lock_rescan_remove();
1da177e4	358
01657868	359	bus = pcibios_find_pci_bus(dn);
c4ec84c7 RW	360	if (!bus) {
	361	ret = -EINVAL;
	362	goto out;
	363	}
56d8456b	364
fd6852c8 BH	365	pr_debug("PCI: Removing PCI slot below EADS bridge %s\n",
	366	bus->self ? pci_name(bus->self) : "<!PHB!>");
	367
8485d1a1	368	slot = find_php_slot(dn);
56d8456b	369	if (slot) {
fd6852c8 BH	370	pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n",
	371	pci_domain_nr(bus), bus->number);
	372
f6afbad8	373	if (rpaphp_deregister_slot(slot)) {
56d8456b JR	374	printk(KERN_ERR
56d8456b JR	375	"%s: unable to remove hotplug slot %s\n",
66bef8c0	376	__func__, drc_name);
c4ec84c7 RW	377	ret = -EIO;
c4ec84c7 RW	378	goto out;
56d8456b	379	}
fd6852c8 BH	380	}
	381
	382	/* Remove all devices below slot */
	383	pcibios_remove_pci_devices(bus);
1da177e4	384
fd6852c8	385	/* Unmap PCI IO space */
3d5134ee	386	if (pcibios_unmap_io_space(bus)) {
9c209c91	387	printk(KERN_ERR "%s: failed to unmap bus range\n",
66bef8c0	388	__func__);
c4ec84c7 RW	389	ret = -ERANGE;
c4ec84c7 RW	390	goto out;
1da177e4	391	}
9c209c91	392
fd6852c8	393	/* Remove the EADS bridge device itself */
9c209c91	394	BUG_ON(!bus->self);
fd6852c8	395	pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self));
210647af	396	pci_stop_and_remove_bus_device(bus->self);
fd6852c8	397
c4ec84c7 RW	398	out:
	399	pci_unlock_rescan_remove();
	400	return ret;
1da177e4 LT	401	}
	402
	403	/**
	404	* dlpar_remove_slot - DLPAR remove an I/O Slot
	405	* @drc_name: drc-name of newly added slot
	406	*
26e6c66e	407	* Remove the kernel and hotplug representations of an I/O Slot.
1da177e4 LT	408	* Return Codes:
	409	* 0 Success
	410	* -ENODEV Not a valid drc_name
	411	* -EINVAL Slot already removed
	412	* -ERESTARTSYS Signalled before obtaining lock
	413	* -EIO Internal Error
	414	*/
	415	int dlpar_remove_slot(char *drc_name)
	416	{
5eeb8c63	417	struct device_node *dn;
5eeb8c63	418	int node_type;
1da177e4 LT	419	int rc = 0;
1da177e4 LT	420
14cc3e2b	421	if (mutex_lock_interruptible(&rpadlpar_mutex))
1da177e4 LT	422	return -ERESTARTSYS;
1da177e4 LT	423
5eeb8c63 JR	424	dn = find_dlpar_node(drc_name, &node_type);
5eeb8c63 JR	425	if (!dn) {
1da177e4 LT	426	rc = -ENODEV;
	427	goto exit;
	428	}
	429
56d8456b JR	430	switch (node_type) {
	431	case NODE_TYPE_VIO:
	432	rc = dlpar_remove_vio_slot(drc_name, dn);
	433	break;
	434	case NODE_TYPE_PHB:
	435	rc = dlpar_remove_phb(drc_name, dn);
	436	break;
	437	case NODE_TYPE_SLOT:
	438	rc = dlpar_remove_pci_slot(drc_name, dn);
	439	break;
1da177e4	440	}
b4a26be9 BH	441	vm_unmap_aliases();
b4a26be9 BH	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",
66bef8c0	462	__func__);
1da177e4 LT	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");