[GitHub/mt8127/android_kernel_alcatel_ttab.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 <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 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_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(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 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_dn *pdn = dn->data;
	struct pci_controller *hose = pdn->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;

	pdn->bussubno = child->number;

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

	return 0;
}

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 struct pci_dev *dlpar_pci_add_bus(struct device_node *dn)
{
	struct pci_dn *pdn = dn->data;
	struct pci_controller *hose = pdn->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, pdn->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 = dlpar_find_new_dev(hose->bus, dn);
	if (dev) {
		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_add_pci_slot(char *drc_name, struct device_node *dn)
{
	struct pci_dev *dev;
	int rc;

	if (rpaphp_find_pci_bus(dn))
		return -EINVAL;

	/* 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;
	}

	if (dn->child) {
		rc = rpaphp_config_pci_adapter(dev->subordinate);
		if (rc < 0) {
			printk(KERN_ERR "%s: unable to enable slot %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(char *drc_name, struct device_node *dn)
{
	struct slot *slot;
	struct pci_dn *pdn;
	int rc = 0;

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

	slot = find_slot(dn);
	if (slot) {
		/* Remove hotplug slot */
		if (rpaphp_remove_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)->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 (down_interruptible(&rpadlpar_sem))
		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:
	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
 * -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 = rpaphp_find_pci_bus(dn);
	if (!bus)
		return -EINVAL;

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

	if (unmap_bus_range(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 (down_interruptible(&rpadlpar_sem))
		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:
	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>
4e57b681 TS	19	#include <linux/string.h>
4e57b681 TS	20
1da177e4 LT	21	#include <asm/pci-bridge.h>
	22	#include <asm/semaphore.h>
	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
	30	static DECLARE_MUTEX(rpadlpar_sem);
	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
	66	while ((np = of_find_node_by_type(np, "pci"))) {
	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
56d8456b	101	static struct slot find_slot(struct device_node dn)
1da177e4 LT	102	{
	103	struct list_head tmp, n;
	104	struct slot *slot;
	105
	106	list_for_each_safe(tmp, n, &rpaphp_slot_head) {
	107	slot = list_entry(tmp, struct slot, rpaphp_slot_list);
56d8456b	108	if (slot->dn == dn)
1da177e4 LT	109	return slot;
	110	}
	111
	112	return NULL;
	113	}
	114
	115	static void rpadlpar_claim_one_bus(struct pci_bus *b)
	116	{
	117	struct list_head *ld;
	118	struct pci_bus *child_bus;
	119
	120	for (ld = b->devices.next; ld != &b->devices; ld = ld->next) {
	121	struct pci_dev *dev = pci_dev_b(ld);
	122	int i;
	123
	124	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
	125	struct resource *r = &dev->resource[i];
	126
	127	if (r->parent \|\| !r->start \|\| !r->flags)
	128	continue;
	129	rpaphp_claim_resource(dev, i);
	130	}
	131	}
	132
	133	list_for_each_entry(child_bus, &b->children, node)
	134	rpadlpar_claim_one_bus(child_bus);
	135	}
	136
	137	static int pci_add_secondary_bus(struct device_node *dn,
	138	struct pci_dev *bridge_dev)
	139	{
1635317f PM	140	struct pci_dn *pdn = dn->data;
1635317f PM	141	struct pci_controller *hose = pdn->phb;
1da177e4 LT	142	struct pci_bus *child;
	143	u8 sec_busno;
	144
	145	/* Get busno of downstream bus */
	146	pci_read_config_byte(bridge_dev, PCI_SECONDARY_BUS, &sec_busno);
	147
	148	/* Allocate and add to children of bridge_dev->bus */
	149	child = pci_add_new_bus(bridge_dev->bus, bridge_dev, sec_busno);
	150	if (!child) {
	151	printk(KERN_ERR "%s: could not add secondary bus\n", __FUNCTION__);
	152	return -ENOMEM;
	153	}
	154
	155	sprintf(child->name, "PCI Bus #%02x", child->number);
	156
	157	/* Fixup subordinate bridge bases and resources */
	158	pcibios_fixup_bus(child);
	159
	160	/* Claim new bus resources */
	161	rpadlpar_claim_one_bus(bridge_dev->bus);
	162
	163	if (hose->last_busno < child->number)
	164	hose->last_busno = child->number;
	165
1635317f	166	pdn->bussubno = child->number;
1da177e4 LT	167
	168	/* ioremap() for child bus, which may or may not succeed */
	169	remap_bus_range(child);
	170
	171	return 0;
	172	}
	173
0945cd5f JR	174	static struct pci_dev dlpar_find_new_dev(struct pci_bus parent,
	175	struct device_node *dev_dn)
	176	{
	177	struct pci_dev *tmp = NULL;
	178	struct device_node *child_dn;
	179
	180	list_for_each_entry(tmp, &parent->devices, bus_list) {
	181	child_dn = pci_device_to_OF_node(tmp);
	182	if (child_dn == dev_dn)
	183	return tmp;
	184	}
	185	return NULL;
	186	}
	187
1da177e4 LT	188	static struct pci_dev dlpar_pci_add_bus(struct device_node dn)
1da177e4 LT	189	{
1635317f PM	190	struct pci_dn *pdn = dn->data;
1635317f PM	191	struct pci_controller *hose = pdn->phb;
1da177e4 LT	192	struct pci_dev *dev = NULL;
	193
	194	/* Scan phb bus for EADS device, adding new one to bus->devices */
1635317f	195	if (!pci_scan_single_device(hose->bus, pdn->devfn)) {
1da177e4 LT	196	printk(KERN_ERR "%s: found no device on bus\n", __FUNCTION__);
	197	return NULL;
	198	}
	199
	200	/* Add new devices to global lists. Register in proc, sysfs. */
	201	pci_bus_add_devices(hose->bus);
	202
	203	/* Confirm new bridge dev was created */
0945cd5f JR	204	dev = dlpar_find_new_dev(hose->bus, dn);
	205	if (dev) {
	206	if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
	207	printk(KERN_ERR "%s: unexpected header type %d\n",
	208	__FUNCTION__, dev->hdr_type);
	209	return NULL;
	210	}
1da177e4	211
0945cd5f JR	212	if (pci_add_secondary_bus(dn, dev))
0945cd5f JR	213	return NULL;
1da177e4 LT	214	}
1da177e4 LT	215
1da177e4 LT	216	return dev;
	217	}
	218
940903c5	219	static int dlpar_add_pci_slot(char drc_name, struct device_node dn)
1da177e4 LT	220	{
1da177e4 LT	221	struct pci_dev *dev;
940903c5	222	int rc;
1da177e4	223
56d8456b JR	224	if (rpaphp_find_pci_bus(dn))
	225	return -EINVAL;
	226
1da177e4 LT	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
940903c5 JR	235	if (dn->child) {
	236	rc = rpaphp_config_pci_adapter(dev->subordinate);
	237	if (rc < 0) {
	238	printk(KERN_ERR "%s: unable to enable slot %s\n",
	239	__FUNCTION__, drc_name);
	240	return -EIO;
	241	}
	242	}
	243
5eeb8c63 JR	244	/* Add hotplug slot */
	245	if (rpaphp_add_slot(dn)) {
	246	printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
	247	__FUNCTION__, drc_name);
	248	return -EIO;
	249	}
1da177e4 LT	250	return 0;
	251	}
	252
	253	static int dlpar_remove_root_bus(struct pci_controller *phb)
	254	{
	255	struct pci_bus *phb_bus;
	256	int rc;
	257
	258	phb_bus = phb->bus;
	259	if (!(list_empty(&phb_bus->children) &&
	260	list_empty(&phb_bus->devices))) {
	261	return -EBUSY;
	262	}
	263
	264	rc = pcibios_remove_root_bus(phb);
	265	if (rc)
	266	return -EIO;
	267
	268	device_unregister(phb_bus->bridge);
	269	pci_remove_bus(phb_bus);
	270
	271	return 0;
	272	}
	273
56d8456b	274	static int dlpar_remove_phb(char drc_name, struct device_node dn)
1da177e4	275	{
56d8456b	276	struct slot *slot;
1635317f	277	struct pci_dn *pdn;
1da177e4 LT	278	int rc = 0;
1da177e4 LT	279
56d8456b JR	280	if (!rpaphp_find_pci_bus(dn))
56d8456b JR	281	return -EINVAL;
1da177e4	282
56d8456b JR	283	slot = find_slot(dn);
	284	if (slot) {
	285	/* Remove hotplug slot */
	286	if (rpaphp_remove_slot(slot)) {
	287	printk(KERN_ERR
	288	"%s: unable to remove hotplug slot %s\n",
	289	__FUNCTION__, drc_name);
	290	return -EIO;
	291	}
1da177e4 LT	292	}
1da177e4 LT	293
1635317f PM	294	pdn = dn->data;
	295	BUG_ON(!pdn \|\| !pdn->phb);
	296	rc = dlpar_remove_root_bus(pdn->phb);
1da177e4 LT	297	if (rc < 0)
	298	return rc;
	299
1635317f	300	pdn->phb = NULL;
56d8456b	301
1da177e4 LT	302	return 0;
	303	}
	304
5eeb8c63	305	static int dlpar_add_phb(char drc_name, struct device_node dn)
1da177e4 LT	306	{
	307	struct pci_controller *phb;
	308
1635317f	309	if (PCI_DN(dn)->phb) {
56d8456b JR	310	/* PHB already exists */
	311	return -EINVAL;
	312	}
	313
1da177e4 LT	314	phb = init_phb_dynamic(dn);
1da177e4 LT	315	if (!phb)
56d8456b	316	return -EIO;
1da177e4	317
5eeb8c63 JR	318	if (rpaphp_add_slot(dn)) {
	319	printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
	320	__FUNCTION__, drc_name);
	321	return -EIO;
	322	}
1da177e4 LT	323	return 0;
	324	}
	325
56d8456b JR	326	static int dlpar_add_vio_slot(char drc_name, struct device_node dn)
	327	{
	328	if (vio_find_node(dn))
	329	return -EINVAL;
	330
	331	if (!vio_register_device_node(dn)) {
	332	printk(KERN_ERR
	333	"%s: failed to register vio node %s\n",
	334	__FUNCTION__, drc_name);
	335	return -EIO;
	336	}
	337	return 0;
	338	}
	339
1da177e4 LT	340	/**
	341	* dlpar_add_slot - DLPAR add an I/O Slot
	342	* @drc_name: drc-name of newly added slot
	343	*
	344	* Make the hotplug module and the kernel aware
	345	* of a newly added I/O Slot.
	346	* Return Codes -
	347	* 0 Success
	348	* -ENODEV Not a valid drc_name
	349	* -EINVAL Slot already added
	350	* -ERESTARTSYS Signalled before obtaining lock
	351	* -EIO Internal PCI Error
	352	*/
	353	int dlpar_add_slot(char *drc_name)
	354	{
	355	struct device_node *dn = NULL;
	356	int node_type;
56d8456b	357	int rc = -EIO;
1da177e4 LT	358
	359	if (down_interruptible(&rpadlpar_sem))
	360	return -ERESTARTSYS;
	361
5eeb8c63 JR	362	/* Find newly added node */
5eeb8c63 JR	363	dn = find_dlpar_node(drc_name, &node_type);
1da177e4 LT	364	if (!dn) {
	365	rc = -ENODEV;
	366	goto exit;
	367	}
	368
	369	switch (node_type) {
	370	case NODE_TYPE_VIO:
56d8456b	371	rc = dlpar_add_vio_slot(drc_name, dn);
1da177e4 LT	372	break;
	373	case NODE_TYPE_SLOT:
	374	rc = dlpar_add_pci_slot(drc_name, dn);
	375	break;
	376	case NODE_TYPE_PHB:
5eeb8c63	377	rc = dlpar_add_phb(drc_name, dn);
1da177e4	378	break;
1da177e4 LT	379	}
1da177e4 LT	380
56d8456b	381	printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
1da177e4 LT	382	exit:
	383	up(&rpadlpar_sem);
	384	return rc;
	385	}
	386
	387	/**
	388	* dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
	389	* @drc_name: drc-name of newly added slot
	390	*
	391	* Remove the kernel and hotplug representations
	392	* of an I/O Slot.
	393	* Return Codes:
	394	* 0 Success
56d8456b	395	* -EINVAL Vio dev doesn't exist
1da177e4	396	*/
56d8456b	397	static int dlpar_remove_vio_slot(char drc_name, struct device_node dn)
1da177e4	398	{
5eeb8c63	399	struct vio_dev *vio_dev;
1da177e4	400
5eeb8c63	401	vio_dev = vio_find_node(dn);
56d8456b JR	402	if (!vio_dev)
56d8456b JR	403	return -EINVAL;
5eeb8c63 JR	404
5eeb8c63 JR	405	vio_unregister_device(vio_dev);
1da177e4 LT	406	return 0;
	407	}
	408
	409	/**
	410	* dlpar_remove_slot - DLPAR remove a PCI I/O Slot
	411	* @drc_name: drc-name of newly added slot
	412	*
	413	* Remove the kernel and hotplug representations
	414	* of a PCI I/O Slot.
	415	* Return Codes:
	416	* 0 Success
	417	* -ENODEV Not a valid drc_name
	418	* -EIO Internal PCI Error
	419	*/
56d8456b	420	int dlpar_remove_pci_slot(char drc_name, struct device_node dn)
1da177e4	421	{
56d8456b JR	422	struct pci_bus *bus;
56d8456b JR	423	struct slot *slot;
1da177e4	424
56d8456b JR	425	bus = rpaphp_find_pci_bus(dn);
	426	if (!bus)
	427	return -EINVAL;
	428
	429	slot = find_slot(dn);
	430	if (slot) {
	431	/* Remove hotplug slot */
	432	if (rpaphp_remove_slot(slot)) {
	433	printk(KERN_ERR
	434	"%s: unable to remove hotplug slot %s\n",
	435	__FUNCTION__, drc_name);
	436	return -EIO;
	437	}
1da177e4 LT	438	}
1da177e4 LT	439
9c209c91 JR	440	if (unmap_bus_range(bus)) {
	441	printk(KERN_ERR "%s: failed to unmap bus range\n",
	442	__FUNCTION__);
	443	return -ERANGE;
1da177e4	444	}
9c209c91 JR	445
	446	BUG_ON(!bus->self);
	447	pci_remove_bus_device(bus->self);
1da177e4 LT	448	return 0;
	449	}
	450
	451	/**
	452	* dlpar_remove_slot - DLPAR remove an I/O Slot
	453	* @drc_name: drc-name of newly added slot
	454	*
	455	* Remove the kernel and hotplug representations
	456	* of an I/O Slot.
	457	* Return Codes:
	458	* 0 Success
	459	* -ENODEV Not a valid drc_name
	460	* -EINVAL Slot already removed
	461	* -ERESTARTSYS Signalled before obtaining lock
	462	* -EIO Internal Error
	463	*/
	464	int dlpar_remove_slot(char *drc_name)
	465	{
5eeb8c63	466	struct device_node *dn;
5eeb8c63	467	int node_type;
1da177e4 LT	468	int rc = 0;
	469
	470	if (down_interruptible(&rpadlpar_sem))
	471	return -ERESTARTSYS;
	472
5eeb8c63 JR	473	dn = find_dlpar_node(drc_name, &node_type);
5eeb8c63 JR	474	if (!dn) {
1da177e4 LT	475	rc = -ENODEV;
	476	goto exit;
	477	}
	478
56d8456b JR	479	switch (node_type) {
	480	case NODE_TYPE_VIO:
	481	rc = dlpar_remove_vio_slot(drc_name, dn);
	482	break;
	483	case NODE_TYPE_PHB:
	484	rc = dlpar_remove_phb(drc_name, dn);
	485	break;
	486	case NODE_TYPE_SLOT:
	487	rc = dlpar_remove_pci_slot(drc_name, dn);
	488	break;
1da177e4	489	}
56d8456b	490	printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
1da177e4 LT	491	exit:
	492	up(&rpadlpar_sem);
	493	return rc;
	494	}
	495
	496	static inline int is_dlpar_capable(void)
	497	{
	498	int rc = rtas_token("ibm,configure-connector");
	499
	500	return (int) (rc != RTAS_UNKNOWN_SERVICE);
	501	}
	502
	503	int __init rpadlpar_io_init(void)
	504	{
	505	int rc = 0;
	506
	507	if (!is_dlpar_capable()) {
	508	printk(KERN_WARNING "%s: partition not DLPAR capable\n",
	509	__FUNCTION__);
	510	return -EPERM;
	511	}
	512
	513	rc = dlpar_sysfs_init();
	514	return rc;
	515	}
	516
	517	void rpadlpar_io_exit(void)
	518	{
	519	dlpar_sysfs_exit();
	520	return;
	521	}
	522
	523	module_init(rpadlpar_io_init);
	524	module_exit(rpadlpar_io_exit);
	525	MODULE_LICENSE("GPL");