[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 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(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));
	pci_stop_and_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;
	}
	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 LT	116	{
	117	struct list_head tmp, n;
	118	struct slot *slot;
	119
8737d6a9	120	list_for_each_safe(tmp, n, &rpaphp_slot_head) {
	121	slot = list_entry(tmp, struct slot, rpaphp_slot_list);
	122	if (slot->dn == dn)
	123	return slot;
	124	}
1da177e4	125
8737d6a9	126	return NULL;
1da177e4 LT	127	}
1da177e4 LT	128
0945cd5f JR	129	static struct pci_dev dlpar_find_new_dev(struct pci_bus parent,
	130	struct device_node *dev_dn)
	131	{
	132	struct pci_dev *tmp = NULL;
	133	struct device_node *child_dn;
	134
	135	list_for_each_entry(tmp, &parent->devices, bus_list) {
	136	child_dn = pci_device_to_OF_node(tmp);
	137	if (child_dn == dev_dn)
	138	return tmp;
	139	}
	140	return NULL;
	141	}
	142
8737d6a9	143	static void dlpar_pci_add_bus(struct device_node *dn)
1da177e4	144	{
8737d6a9	145	struct pci_dn *pdn = PCI_DN(dn);
5fa80fcd	146	struct pci_controller *phb = pdn->phb;
1da177e4 LT	147	struct pci_dev *dev = NULL;
1da177e4 LT	148
d681db4a	149	eeh_add_device_tree_early(dn);
d681db4a	150
5fa80fcd JR	151	/* Add EADS device to PHB bus, adding new entry to bus->devices */
	152	dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
	153	if (!dev) {
	154	printk(KERN_ERR "%s: failed to create pci dev for %s\n",
66bef8c0	155	__func__, dn->full_name);
8737d6a9	156	return;
1da177e4 LT	157	}
1da177e4 LT	158
fd6852c8	159	/* Scan below the new bridge */
5fa80fcd JR	160	if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE \|\|
5fa80fcd JR	161	dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
98d9f30c	162	of_scan_pci_bridge(dev);
5fa80fcd	163
3d5134ee BH	164	/* Map IO space for child bus, which may or may not succeed */
3d5134ee BH	165	pcibios_map_io_space(dev->subordinate);
5fa80fcd	166
fd6852c8 BH	167	/* Finish adding it : resource allocation, adding devices, etc...
	168	* Note that we need to perform the finish pass on the -parent-
	169	* bus of the EADS bridge so the bridge device itself gets
	170	* properly added
	171	*/
	172	pcibios_finish_adding_to_bus(phb->bus);
1da177e4 LT	173	}
1da177e4 LT	174
940903c5	175	static int dlpar_add_pci_slot(char drc_name, struct device_node dn)
1da177e4 LT	176	{
1da177e4 LT	177	struct pci_dev *dev;
8737d6a9	178	struct pci_controller *phb;
1da177e4	179
01657868	180	if (pcibios_find_pci_bus(dn))
56d8456b JR	181	return -EINVAL;
56d8456b JR	182
1da177e4	183	/* Add pci bus */
8737d6a9	184	dlpar_pci_add_bus(dn);
	185
	186	/* Confirm new bridge dev was created */
	187	phb = PCI_DN(dn)->phb;
	188	dev = dlpar_find_new_dev(phb->bus, dn);
	189
1da177e4	190	if (!dev) {
66bef8c0	191	printk(KERN_ERR "%s: unable to add bus %s\n", __func__,
1da177e4 LT	192	drc_name);
	193	return -EIO;
	194	}
	195
8737d6a9	196	if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
8737d6a9	197	printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n",
66bef8c0	198	__func__, dev->hdr_type, drc_name);
8737d6a9	199	return -EIO;
	200	}
	201
5eeb8c63 JR	202	/* Add hotplug slot */
	203	if (rpaphp_add_slot(dn)) {
	204	printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
66bef8c0	205	__func__, drc_name);
5eeb8c63 JR	206	return -EIO;
5eeb8c63 JR	207	}
1da177e4 LT	208	return 0;
	209	}
	210
56d8456b	211	static int dlpar_remove_phb(char drc_name, struct device_node dn)
1da177e4	212	{
56d8456b	213	struct slot *slot;
1635317f	214	struct pci_dn *pdn;
1da177e4 LT	215	int rc = 0;
1da177e4 LT	216
01657868	217	if (!pcibios_find_pci_bus(dn))
56d8456b	218	return -EINVAL;
1da177e4	219
8485d1a1 LV	220	/* If pci slot is hotplugable, use hotplug to remove it */
8485d1a1 LV	221	slot = find_php_slot(dn);
fd6852c8 BH	222	if (slot && rpaphp_deregister_slot(slot)) {
	223	printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",
	224	__func__, drc_name);
	225	return -EIO;
1da177e4 LT	226	}
1da177e4 LT	227
1635317f PM	228	pdn = dn->data;
1635317f PM	229	BUG_ON(!pdn \|\| !pdn->phb);
fd6852c8	230	rc = remove_phb_dynamic(pdn->phb);
1da177e4 LT	231	if (rc < 0)
	232	return rc;
	233
1635317f	234	pdn->phb = NULL;
56d8456b	235
1da177e4 LT	236	return 0;
	237	}
	238
5eeb8c63	239	static int dlpar_add_phb(char drc_name, struct device_node dn)
1da177e4 LT	240	{
	241	struct pci_controller *phb;
	242
fe98aeab	243	if (PCI_DN(dn) && PCI_DN(dn)->phb) {
56d8456b JR	244	/* PHB already exists */
	245	return -EINVAL;
	246	}
	247
1da177e4 LT	248	phb = init_phb_dynamic(dn);
1da177e4 LT	249	if (!phb)
56d8456b	250	return -EIO;
1da177e4	251
5eeb8c63 JR	252	if (rpaphp_add_slot(dn)) {
5eeb8c63 JR	253	printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
66bef8c0	254	__func__, drc_name);
5eeb8c63 JR	255	return -EIO;
5eeb8c63 JR	256	}
1da177e4 LT	257	return 0;
	258	}
	259
56d8456b JR	260	static int dlpar_add_vio_slot(char drc_name, struct device_node dn)
	261	{
	262	if (vio_find_node(dn))
	263	return -EINVAL;
	264
	265	if (!vio_register_device_node(dn)) {
	266	printk(KERN_ERR
	267	"%s: failed to register vio node %s\n",
66bef8c0	268	__func__, drc_name);
56d8456b JR	269	return -EIO;
	270	}
	271	return 0;
	272	}
	273
1da177e4 LT	274	/**
	275	* dlpar_add_slot - DLPAR add an I/O Slot
	276	* @drc_name: drc-name of newly added slot
	277	*
26e6c66e RD	278	* Make the hotplug module and the kernel aware of a newly added I/O Slot.
26e6c66e RD	279	* Return Codes:
1da177e4 LT	280	* 0 Success
	281	* -ENODEV Not a valid drc_name
	282	* -EINVAL Slot already added
	283	* -ERESTARTSYS Signalled before obtaining lock
	284	* -EIO Internal PCI Error
	285	*/
	286	int dlpar_add_slot(char *drc_name)
	287	{
	288	struct device_node *dn = NULL;
	289	int node_type;
56d8456b	290	int rc = -EIO;
1da177e4	291
14cc3e2b	292	if (mutex_lock_interruptible(&rpadlpar_mutex))
1da177e4 LT	293	return -ERESTARTSYS;
1da177e4 LT	294
5eeb8c63 JR	295	/* Find newly added node */
5eeb8c63 JR	296	dn = find_dlpar_node(drc_name, &node_type);
1da177e4 LT	297	if (!dn) {
	298	rc = -ENODEV;
	299	goto exit;
	300	}
	301
	302	switch (node_type) {
	303	case NODE_TYPE_VIO:
56d8456b	304	rc = dlpar_add_vio_slot(drc_name, dn);
1da177e4 LT	305	break;
	306	case NODE_TYPE_SLOT:
	307	rc = dlpar_add_pci_slot(drc_name, dn);
	308	break;
	309	case NODE_TYPE_PHB:
5eeb8c63	310	rc = dlpar_add_phb(drc_name, dn);
1da177e4	311	break;
1da177e4 LT	312	}
1da177e4 LT	313
56d8456b	314	printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
1da177e4	315	exit:
14cc3e2b	316	mutex_unlock(&rpadlpar_mutex);
1da177e4 LT	317	return rc;
	318	}
	319
	320	/**
	321	* dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
	322	* @drc_name: drc-name of newly added slot
26e6c66e	323	* @dn: &device_node
1da177e4	324	*
26e6c66e	325	* Remove the kernel and hotplug representations of an I/O Slot.
1da177e4 LT	326	* Return Codes:
1da177e4 LT	327	* 0 Success
56d8456b	328	* -EINVAL Vio dev doesn't exist
1da177e4	329	*/
56d8456b	330	static int dlpar_remove_vio_slot(char drc_name, struct device_node dn)
1da177e4	331	{
5eeb8c63	332	struct vio_dev *vio_dev;
1da177e4	333
5eeb8c63	334	vio_dev = vio_find_node(dn);
56d8456b JR	335	if (!vio_dev)
56d8456b JR	336	return -EINVAL;
5eeb8c63 JR	337
5eeb8c63 JR	338	vio_unregister_device(vio_dev);
1da177e4 LT	339	return 0;
	340	}
	341
	342	/**
26e6c66e	343	* dlpar_remove_pci_slot - DLPAR remove a PCI I/O Slot
1da177e4	344	* @drc_name: drc-name of newly added slot
26e6c66e	345	* @dn: &device_node
1da177e4	346	*
26e6c66e	347	* Remove the kernel and hotplug representations of a PCI I/O Slot.
1da177e4 LT	348	* Return Codes:
	349	* 0 Success
	350	* -ENODEV Not a valid drc_name
	351	* -EIO Internal PCI Error
	352	*/
56d8456b	353	int dlpar_remove_pci_slot(char drc_name, struct device_node dn)
1da177e4	354	{
56d8456b JR	355	struct pci_bus *bus;
56d8456b JR	356	struct slot *slot;
1da177e4	357
01657868	358	bus = pcibios_find_pci_bus(dn);
56d8456b JR	359	if (!bus)
	360	return -EINVAL;
	361
fd6852c8 BH	362	pr_debug("PCI: Removing PCI slot below EADS bridge %s\n",
	363	bus->self ? pci_name(bus->self) : "<!PHB!>");
	364
8485d1a1	365	slot = find_php_slot(dn);
56d8456b	366	if (slot) {
fd6852c8 BH	367	pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n",
	368	pci_domain_nr(bus), bus->number);
	369
f6afbad8	370	if (rpaphp_deregister_slot(slot)) {
56d8456b JR	371	printk(KERN_ERR
56d8456b JR	372	"%s: unable to remove hotplug slot %s\n",
66bef8c0	373	__func__, drc_name);
56d8456b JR	374	return -EIO;
56d8456b JR	375	}
fd6852c8 BH	376	}
	377
	378	/* Remove all devices below slot */
	379	pcibios_remove_pci_devices(bus);
1da177e4	380
fd6852c8	381	/* Unmap PCI IO space */
3d5134ee	382	if (pcibios_unmap_io_space(bus)) {
9c209c91	383	printk(KERN_ERR "%s: failed to unmap bus range\n",
66bef8c0	384	__func__);
9c209c91	385	return -ERANGE;
1da177e4	386	}
9c209c91	387
fd6852c8	388	/* Remove the EADS bridge device itself */
9c209c91	389	BUG_ON(!bus->self);
fd6852c8	390	pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self));
210647af	391	pci_stop_and_remove_bus_device(bus->self);
fd6852c8	392
1da177e4 LT	393	return 0;
	394	}
	395
	396	/**
	397	* dlpar_remove_slot - DLPAR remove an I/O Slot
	398	* @drc_name: drc-name of newly added slot
	399	*
26e6c66e	400	* Remove the kernel and hotplug representations of an I/O Slot.
1da177e4 LT	401	* Return Codes:
	402	* 0 Success
	403	* -ENODEV Not a valid drc_name
	404	* -EINVAL Slot already removed
	405	* -ERESTARTSYS Signalled before obtaining lock
	406	* -EIO Internal Error
	407	*/
	408	int dlpar_remove_slot(char *drc_name)
	409	{
5eeb8c63	410	struct device_node *dn;
5eeb8c63	411	int node_type;
1da177e4 LT	412	int rc = 0;
1da177e4 LT	413
14cc3e2b	414	if (mutex_lock_interruptible(&rpadlpar_mutex))
1da177e4 LT	415	return -ERESTARTSYS;
1da177e4 LT	416
5eeb8c63 JR	417	dn = find_dlpar_node(drc_name, &node_type);
5eeb8c63 JR	418	if (!dn) {
1da177e4 LT	419	rc = -ENODEV;
	420	goto exit;
	421	}
	422
56d8456b JR	423	switch (node_type) {
	424	case NODE_TYPE_VIO:
	425	rc = dlpar_remove_vio_slot(drc_name, dn);
	426	break;
	427	case NODE_TYPE_PHB:
	428	rc = dlpar_remove_phb(drc_name, dn);
	429	break;
	430	case NODE_TYPE_SLOT:
	431	rc = dlpar_remove_pci_slot(drc_name, dn);
	432	break;
1da177e4	433	}
b4a26be9 BH	434	vm_unmap_aliases();
b4a26be9 BH	435
56d8456b	436	printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
1da177e4	437	exit:
14cc3e2b	438	mutex_unlock(&rpadlpar_mutex);
1da177e4 LT	439	return rc;
	440	}
	441
	442	static inline int is_dlpar_capable(void)
	443	{
	444	int rc = rtas_token("ibm,configure-connector");
	445
	446	return (int) (rc != RTAS_UNKNOWN_SERVICE);
	447	}
	448
	449	int __init rpadlpar_io_init(void)
	450	{
	451	int rc = 0;
	452
	453	if (!is_dlpar_capable()) {
	454	printk(KERN_WARNING "%s: partition not DLPAR capable\n",
66bef8c0	455	__func__);
1da177e4 LT	456	return -EPERM;
	457	}
	458
	459	rc = dlpar_sysfs_init();
	460	return rc;
	461	}
	462
	463	void rpadlpar_io_exit(void)
	464	{
	465	dlpar_sysfs_exit();
	466	return;
	467	}
	468
	469	module_init(rpadlpar_io_init);
	470	module_exit(rpadlpar_io_exit);
	471	MODULE_LICENSE("GPL");