[deliverable/linux.git] / arch / powerpc / platforms / pseries / dlpar.c

/*
 * Support for dynamic reconfiguration for PCI, Memory, and CPU
 * Hotplug and Dynamic Logical Partitioning on RPA platforms.
 *
 * Copyright (C) 2009 Nathan Fontenot
 * Copyright (C) 2009 IBM Corporation
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/notifier.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/cpu.h>
#include <linux/slab.h>
#include "offline_states.h"

#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/uaccess.h>
#include <asm/rtas.h>
#include <asm/pSeries_reconfig.h>

struct cc_workarea {
	u32	drc_index;
	u32	zero;
	u32	name_offset;
	u32	prop_length;
	u32	prop_offset;
};

void dlpar_free_cc_property(struct property *prop)
{
	kfree(prop->name);
	kfree(prop->value);
	kfree(prop);
}

static struct property *dlpar_parse_cc_property(struct cc_workarea *ccwa)
{
	struct property *prop;
	char *name;
	char *value;

	prop = kzalloc(sizeof(*prop), GFP_KERNEL);
	if (!prop)
		return NULL;

	name = (char *)ccwa + ccwa->name_offset;
	prop->name = kstrdup(name, GFP_KERNEL);

	prop->length = ccwa->prop_length;
	value = (char *)ccwa + ccwa->prop_offset;
	prop->value = kmemdup(value, prop->length, GFP_KERNEL);
	if (!prop->value) {
		dlpar_free_cc_property(prop);
		return NULL;
	}

	return prop;
}

static struct device_node *dlpar_parse_cc_node(struct cc_workarea *ccwa)
{
	struct device_node *dn;
	char *name;

	dn = kzalloc(sizeof(*dn), GFP_KERNEL);
	if (!dn)
		return NULL;

	/* The configure connector reported name does not contain a
	 * preceding '/', so we allocate a buffer large enough to
	 * prepend this to the full_name.
	 */
	name = (char *)ccwa + ccwa->name_offset;
	dn->full_name = kasprintf(GFP_KERNEL, "/%s", name);
	if (!dn->full_name) {
		kfree(dn);
		return NULL;
	}

	return dn;
}

static void dlpar_free_one_cc_node(struct device_node *dn)
{
	struct property *prop;

	while (dn->properties) {
		prop = dn->properties;
		dn->properties = prop->next;
		dlpar_free_cc_property(prop);
	}

	kfree(dn->full_name);
	kfree(dn);
}

void dlpar_free_cc_nodes(struct device_node *dn)
{
	if (dn->child)
		dlpar_free_cc_nodes(dn->child);

	if (dn->sibling)
		dlpar_free_cc_nodes(dn->sibling);

	dlpar_free_one_cc_node(dn);
}

#define COMPLETE	0
#define NEXT_SIBLING    1
#define NEXT_CHILD      2
#define NEXT_PROPERTY   3
#define PREV_PARENT     4
#define MORE_MEMORY     5
#define CALL_AGAIN	-2
#define ERR_CFG_USE     -9003

struct device_node *dlpar_configure_connector(u32 drc_index)
{
	struct device_node *dn;
	struct device_node *first_dn = NULL;
	struct device_node *last_dn = NULL;
	struct property *property;
	struct property *last_property = NULL;
	struct cc_workarea *ccwa;
	char *data_buf;
	int cc_token;
	int rc = -1;

	cc_token = rtas_token("ibm,configure-connector");
	if (cc_token == RTAS_UNKNOWN_SERVICE)
		return NULL;

	data_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
	if (!data_buf)
		return NULL;

	ccwa = (struct cc_workarea *)&data_buf[0];
	ccwa->drc_index = drc_index;
	ccwa->zero = 0;

	do {
		/* Since we release the rtas_data_buf lock between configure
		 * connector calls we want to re-populate the rtas_data_buffer
		 * with the contents of the previous call.
		 */
		spin_lock(&rtas_data_buf_lock);

		memcpy(rtas_data_buf, data_buf, RTAS_DATA_BUF_SIZE);
		rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL);
		memcpy(data_buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);

		spin_unlock(&rtas_data_buf_lock);

		switch (rc) {
		case COMPLETE:
			break;

		case NEXT_SIBLING:
			dn = dlpar_parse_cc_node(ccwa);
			if (!dn)
				goto cc_error;

			dn->parent = last_dn->parent;
			last_dn->sibling = dn;
			last_dn = dn;
			break;

		case NEXT_CHILD:
			dn = dlpar_parse_cc_node(ccwa);
			if (!dn)
				goto cc_error;

			if (!first_dn)
				first_dn = dn;
			else {
				dn->parent = last_dn;
				if (last_dn)
					last_dn->child = dn;
			}

			last_dn = dn;
			break;

		case NEXT_PROPERTY:
			property = dlpar_parse_cc_property(ccwa);
			if (!property)
				goto cc_error;

			if (!last_dn->properties)
				last_dn->properties = property;
			else
				last_property->next = property;

			last_property = property;
			break;

		case PREV_PARENT:
			last_dn = last_dn->parent;
			break;

		case CALL_AGAIN:
			break;

		case MORE_MEMORY:
		case ERR_CFG_USE:
		default:
			printk(KERN_ERR "Unexpected Error (%d) "
			       "returned from configure-connector\n", rc);
			goto cc_error;
		}
	} while (rc);

cc_error:
	kfree(data_buf);

	if (rc) {
		if (first_dn)
			dlpar_free_cc_nodes(first_dn);

		return NULL;
	}

	return first_dn;
}

static struct device_node *derive_parent(const char *path)
{
	struct device_node *parent;
	char *last_slash;

	last_slash = strrchr(path, '/');
	if (last_slash == path) {
		parent = of_find_node_by_path("/");
	} else {
		char *parent_path;
		int parent_path_len = last_slash - path + 1;
		parent_path = kmalloc(parent_path_len, GFP_KERNEL);
		if (!parent_path)
			return NULL;

		strlcpy(parent_path, path, parent_path_len);
		parent = of_find_node_by_path(parent_path);
		kfree(parent_path);
	}

	return parent;
}

int dlpar_attach_node(struct device_node *dn)
{
#ifdef CONFIG_PROC_DEVICETREE
	struct proc_dir_entry *ent;
#endif
	int rc;

	of_node_set_flag(dn, OF_DYNAMIC);
	kref_init(&dn->kref);
	dn->parent = derive_parent(dn->full_name);
	if (!dn->parent)
		return -ENOMEM;

	rc = pSeries_reconfig_notify(PSERIES_RECONFIG_ADD, dn);
	if (rc) {
		printk(KERN_ERR "Failed to add device node %s\n",
		       dn->full_name);
		return rc;
	}

	of_attach_node(dn);

#ifdef CONFIG_PROC_DEVICETREE
	ent = proc_mkdir(strrchr(dn->full_name, '/') + 1, dn->parent->pde);
	if (ent)
		proc_device_tree_add_node(dn, ent);
#endif

	of_node_put(dn->parent);
	return 0;
}

int dlpar_detach_node(struct device_node *dn)
{
#ifdef CONFIG_PROC_DEVICETREE
	struct device_node *parent = dn->parent;
	struct property *prop = dn->properties;

	while (prop) {
		remove_proc_entry(prop->name, dn->pde);
		prop = prop->next;
	}

	if (dn->pde)
		remove_proc_entry(dn->pde->name, parent->pde);
#endif

	pSeries_reconfig_notify(PSERIES_RECONFIG_REMOVE, dn);
	of_detach_node(dn);
	of_node_put(dn); /* Must decrement the refcount */

	return 0;
}

#define DR_ENTITY_SENSE		9003
#define DR_ENTITY_PRESENT	1
#define DR_ENTITY_UNUSABLE	2
#define ALLOCATION_STATE	9003
#define ALLOC_UNUSABLE		0
#define ALLOC_USABLE		1
#define ISOLATION_STATE		9001
#define ISOLATE			0
#define UNISOLATE		1

int dlpar_acquire_drc(u32 drc_index)
{
	int dr_status, rc;

	rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
		       DR_ENTITY_SENSE, drc_index);
	if (rc || dr_status != DR_ENTITY_UNUSABLE)
		return -1;

	rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_USABLE);
	if (rc)
		return rc;

	rc = rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
	if (rc) {
		rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
		return rc;
	}

	return 0;
}

int dlpar_release_drc(u32 drc_index)
{
	int dr_status, rc;

	rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
		       DR_ENTITY_SENSE, drc_index);
	if (rc || dr_status != DR_ENTITY_PRESENT)
		return -1;

	rc = rtas_set_indicator(ISOLATION_STATE, drc_index, ISOLATE);
	if (rc)
		return rc;

	rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
	if (rc) {
		rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
		return rc;
	}

	return 0;
}

#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE

static int dlpar_online_cpu(struct device_node *dn)
{
	int rc = 0;
	unsigned int cpu;
	int len, nthreads, i;
	const u32 *intserv;

	intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
	if (!intserv)
		return -EINVAL;

	nthreads = len / sizeof(u32);

	cpu_maps_update_begin();
	for (i = 0; i < nthreads; i++) {
		for_each_present_cpu(cpu) {
			if (get_hard_smp_processor_id(cpu) != intserv[i])
				continue;
			BUG_ON(get_cpu_current_state(cpu)
					!= CPU_STATE_OFFLINE);
			cpu_maps_update_done();
			rc = cpu_up(cpu);
			if (rc)
				goto out;
			cpu_maps_update_begin();

			break;
		}
		if (cpu == num_possible_cpus())
			printk(KERN_WARNING "Could not find cpu to online "
			       "with physical id 0x%x\n", intserv[i]);
	}
	cpu_maps_update_done();

out:
	return rc;

}

static ssize_t dlpar_cpu_probe(const char *buf, size_t count)
{
	struct device_node *dn;
	unsigned long drc_index;
	char *cpu_name;
	int rc;

	cpu_hotplug_driver_lock();
	rc = strict_strtoul(buf, 0, &drc_index);
	if (rc) {
		rc = -EINVAL;
		goto out;
	}

	dn = dlpar_configure_connector(drc_index);
	if (!dn) {
		rc = -EINVAL;
		goto out;
	}

	/* configure-connector reports cpus as living in the base
	 * directory of the device tree.  CPUs actually live in the
	 * cpus directory so we need to fixup the full_name.
	 */
	cpu_name = kasprintf(GFP_KERNEL, "/cpus%s", dn->full_name);
	if (!cpu_name) {
		dlpar_free_cc_nodes(dn);
		rc = -ENOMEM;
		goto out;
	}

	kfree(dn->full_name);
	dn->full_name = cpu_name;

	rc = dlpar_acquire_drc(drc_index);
	if (rc) {
		dlpar_free_cc_nodes(dn);
		rc = -EINVAL;
		goto out;
	}

	rc = dlpar_attach_node(dn);
	if (rc) {
		dlpar_release_drc(drc_index);
		dlpar_free_cc_nodes(dn);
		goto out;
	}

	rc = dlpar_online_cpu(dn);
out:
	cpu_hotplug_driver_unlock();

	return rc ? rc : count;
}

static int dlpar_offline_cpu(struct device_node *dn)
{
	int rc = 0;
	unsigned int cpu;
	int len, nthreads, i;
	const u32 *intserv;

	intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
	if (!intserv)
		return -EINVAL;

	nthreads = len / sizeof(u32);

	cpu_maps_update_begin();
	for (i = 0; i < nthreads; i++) {
		for_each_present_cpu(cpu) {
			if (get_hard_smp_processor_id(cpu) != intserv[i])
				continue;

			if (get_cpu_current_state(cpu) == CPU_STATE_OFFLINE)
				break;

			if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) {
				set_preferred_offline_state(cpu, CPU_STATE_OFFLINE);
				cpu_maps_update_done();
				rc = cpu_down(cpu);
				if (rc)
					goto out;
				cpu_maps_update_begin();
				break;

			}

			/*
			 * The cpu is in CPU_STATE_INACTIVE.
			 * Upgrade it's state to CPU_STATE_OFFLINE.
			 */
			set_preferred_offline_state(cpu, CPU_STATE_OFFLINE);
			BUG_ON(plpar_hcall_norets(H_PROD, intserv[i])
								!= H_SUCCESS);
			__cpu_die(cpu);
			break;
		}
		if (cpu == num_possible_cpus())
			printk(KERN_WARNING "Could not find cpu to offline "
			       "with physical id 0x%x\n", intserv[i]);
	}
	cpu_maps_update_done();

out:
	return rc;

}

static ssize_t dlpar_cpu_release(const char *buf, size_t count)
{
	struct device_node *dn;
	const u32 *drc_index;
	int rc;

	dn = of_find_node_by_path(buf);
	if (!dn)
		return -EINVAL;

	drc_index = of_get_property(dn, "ibm,my-drc-index", NULL);
	if (!drc_index) {
		of_node_put(dn);
		return -EINVAL;
	}

	cpu_hotplug_driver_lock();
	rc = dlpar_offline_cpu(dn);
	if (rc) {
		of_node_put(dn);
		rc = -EINVAL;
		goto out;
	}

	rc = dlpar_release_drc(*drc_index);
	if (rc) {
		of_node_put(dn);
		goto out;
	}

	rc = dlpar_detach_node(dn);
	if (rc) {
		dlpar_acquire_drc(*drc_index);
		goto out;
	}

	of_node_put(dn);
out:
	cpu_hotplug_driver_unlock();
	return rc ? rc : count;
}

static int __init pseries_dlpar_init(void)
{
	ppc_md.cpu_probe = dlpar_cpu_probe;
	ppc_md.cpu_release = dlpar_cpu_release;

	return 0;
}
machine_device_initcall(pseries, pseries_dlpar_init);

#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
Commit	Line	Data
ab519a01 NF	1	/*
	2	* Support for dynamic reconfiguration for PCI, Memory, and CPU
	3	* Hotplug and Dynamic Logical Partitioning on RPA platforms.
	4	*
	5	* Copyright (C) 2009 Nathan Fontenot
	6	* Copyright (C) 2009 IBM Corporation
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License version
	10	* 2 as published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/kernel.h>
	14	#include <linux/kref.h>
	15	#include <linux/notifier.h>
	16	#include <linux/proc_fs.h>
	17	#include <linux/spinlock.h>
	18	#include <linux/cpu.h>
5a0e3ad6	19	#include <linux/slab.h>
b6db63d1	20	#include "offline_states.h"
ab519a01 NF	21
	22	#include <asm/prom.h>
	23	#include <asm/machdep.h>
	24	#include <asm/uaccess.h>
	25	#include <asm/rtas.h>
	26	#include <asm/pSeries_reconfig.h>
	27
	28	struct cc_workarea {
	29	u32 drc_index;
	30	u32 zero;
	31	u32 name_offset;
	32	u32 prop_length;
	33	u32 prop_offset;
	34	};
	35
20648974	36	void dlpar_free_cc_property(struct property *prop)
ab519a01 NF	37	{
	38	kfree(prop->name);
	39	kfree(prop->value);
	40	kfree(prop);
	41	}
	42
	43	static struct property dlpar_parse_cc_property(struct cc_workarea ccwa)
	44	{
	45	struct property *prop;
	46	char *name;
	47	char *value;
	48
	49	prop = kzalloc(sizeof(*prop), GFP_KERNEL);
	50	if (!prop)
	51	return NULL;
	52
	53	name = (char *)ccwa + ccwa->name_offset;
	54	prop->name = kstrdup(name, GFP_KERNEL);
	55
	56	prop->length = ccwa->prop_length;
	57	value = (char *)ccwa + ccwa->prop_offset;
e72ed6b5	58	prop->value = kmemdup(value, prop->length, GFP_KERNEL);
ab519a01 NF	59	if (!prop->value) {
	60	dlpar_free_cc_property(prop);
	61	return NULL;
	62	}
	63
ab519a01 NF	64	return prop;
	65	}
	66
	67	static struct device_node dlpar_parse_cc_node(struct cc_workarea ccwa)
	68	{
	69	struct device_node *dn;
	70	char *name;
	71
	72	dn = kzalloc(sizeof(*dn), GFP_KERNEL);
	73	if (!dn)
	74	return NULL;
	75
	76	/* The configure connector reported name does not contain a
25985edc	77	* preceding '/', so we allocate a buffer large enough to
ab519a01 NF	78	* prepend this to the full_name.
	79	*/
	80	name = (char *)ccwa + ccwa->name_offset;
43caa61f	81	dn->full_name = kasprintf(GFP_KERNEL, "/%s", name);
ab519a01 NF	82	if (!dn->full_name) {
	83	kfree(dn);
	84	return NULL;
	85	}
	86
ab519a01 NF	87	return dn;
	88	}
	89
	90	static void dlpar_free_one_cc_node(struct device_node *dn)
	91	{
	92	struct property *prop;
	93
	94	while (dn->properties) {
	95	prop = dn->properties;
	96	dn->properties = prop->next;
	97	dlpar_free_cc_property(prop);
	98	}
	99
	100	kfree(dn->full_name);
	101	kfree(dn);
	102	}
	103
20648974	104	void dlpar_free_cc_nodes(struct device_node *dn)
ab519a01 NF	105	{
	106	if (dn->child)
	107	dlpar_free_cc_nodes(dn->child);
	108
	109	if (dn->sibling)
	110	dlpar_free_cc_nodes(dn->sibling);
	111
	112	dlpar_free_one_cc_node(dn);
	113	}
	114
9c740025	115	#define COMPLETE 0
ab519a01 NF	116	#define NEXT_SIBLING 1
	117	#define NEXT_CHILD 2
	118	#define NEXT_PROPERTY 3
	119	#define PREV_PARENT 4
	120	#define MORE_MEMORY 5
	121	#define CALL_AGAIN -2
	122	#define ERR_CFG_USE -9003
	123
	124	struct device_node *dlpar_configure_connector(u32 drc_index)
	125	{
	126	struct device_node *dn;
	127	struct device_node *first_dn = NULL;
	128	struct device_node *last_dn = NULL;
	129	struct property *property;
	130	struct property *last_property = NULL;
	131	struct cc_workarea *ccwa;
93f68f1e	132	char *data_buf;
ab519a01	133	int cc_token;
93f68f1e	134	int rc = -1;
ab519a01 NF	135
	136	cc_token = rtas_token("ibm,configure-connector");
	137	if (cc_token == RTAS_UNKNOWN_SERVICE)
	138	return NULL;
	139
93f68f1e NF	140	data_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
	141	if (!data_buf)
	142	return NULL;
	143
	144	ccwa = (struct cc_workarea *)&data_buf[0];
ab519a01 NF	145	ccwa->drc_index = drc_index;
	146	ccwa->zero = 0;
	147
93f68f1e NF	148	do {
	149	/* Since we release the rtas_data_buf lock between configure
	150	* connector calls we want to re-populate the rtas_data_buffer
	151	* with the contents of the previous call.
	152	*/
	153	spin_lock(&rtas_data_buf_lock);
	154
	155	memcpy(rtas_data_buf, data_buf, RTAS_DATA_BUF_SIZE);
	156	rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL);
	157	memcpy(data_buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
	158
	159	spin_unlock(&rtas_data_buf_lock);
	160
ab519a01	161	switch (rc) {
9c740025 AB	162	case COMPLETE:
	163	break;
	164
ab519a01 NF	165	case NEXT_SIBLING:
	166	dn = dlpar_parse_cc_node(ccwa);
	167	if (!dn)
	168	goto cc_error;
	169
	170	dn->parent = last_dn->parent;
	171	last_dn->sibling = dn;
	172	last_dn = dn;
	173	break;
	174
	175	case NEXT_CHILD:
	176	dn = dlpar_parse_cc_node(ccwa);
	177	if (!dn)
	178	goto cc_error;
	179
	180	if (!first_dn)
	181	first_dn = dn;
	182	else {
	183	dn->parent = last_dn;
	184	if (last_dn)
	185	last_dn->child = dn;
	186	}
	187
	188	last_dn = dn;
	189	break;
	190
	191	case NEXT_PROPERTY:
	192	property = dlpar_parse_cc_property(ccwa);
	193	if (!property)
	194	goto cc_error;
	195
	196	if (!last_dn->properties)
	197	last_dn->properties = property;
	198	else
	199	last_property->next = property;
	200
	201	last_property = property;
	202	break;
	203
	204	case PREV_PARENT:
	205	last_dn = last_dn->parent;
	206	break;
	207
	208	case CALL_AGAIN:
	209	break;
	210
	211	case MORE_MEMORY:
	212	case ERR_CFG_USE:
	213	default:
	214	printk(KERN_ERR "Unexpected Error (%d) "
	215	"returned from configure-connector\n", rc);
	216	goto cc_error;
	217	}
93f68f1e	218	} while (rc);
ab519a01	219
93f68f1e NF	220	cc_error:
	221	kfree(data_buf);
	222
	223	if (rc) {
	224	if (first_dn)
	225	dlpar_free_cc_nodes(first_dn);
	226
	227	return NULL;
ab519a01 NF	228	}
ab519a01 NF	229
ab519a01	230	return first_dn;
ab519a01 NF	231	}
	232
	233	static struct device_node derive_parent(const char path)
	234	{
	235	struct device_node *parent;
	236	char *last_slash;
	237
	238	last_slash = strrchr(path, '/');
	239	if (last_slash == path) {
	240	parent = of_find_node_by_path("/");
	241	} else {
	242	char *parent_path;
	243	int parent_path_len = last_slash - path + 1;
	244	parent_path = kmalloc(parent_path_len, GFP_KERNEL);
	245	if (!parent_path)
	246	return NULL;
	247
	248	strlcpy(parent_path, path, parent_path_len);
	249	parent = of_find_node_by_path(parent_path);
	250	kfree(parent_path);
	251	}
	252
	253	return parent;
	254	}
	255
	256	int dlpar_attach_node(struct device_node *dn)
	257	{
46150a05	258	#ifdef CONFIG_PROC_DEVICETREE
ab519a01	259	struct proc_dir_entry *ent;
46150a05	260	#endif
ab519a01 NF	261	int rc;
	262
	263	of_node_set_flag(dn, OF_DYNAMIC);
	264	kref_init(&dn->kref);
	265	dn->parent = derive_parent(dn->full_name);
	266	if (!dn->parent)
	267	return -ENOMEM;
	268
3aef19f0 AM	269	rc = pSeries_reconfig_notify(PSERIES_RECONFIG_ADD, dn);
3aef19f0 AM	270	if (rc) {
ab519a01 NF	271	printk(KERN_ERR "Failed to add device node %s\n",
ab519a01 NF	272	dn->full_name);
3aef19f0	273	return rc;
ab519a01 NF	274	}
	275
	276	of_attach_node(dn);
	277
	278	#ifdef CONFIG_PROC_DEVICETREE
	279	ent = proc_mkdir(strrchr(dn->full_name, '/') + 1, dn->parent->pde);
	280	if (ent)
	281	proc_device_tree_add_node(dn, ent);
	282	#endif
	283
	284	of_node_put(dn->parent);
	285	return 0;
	286	}
	287
	288	int dlpar_detach_node(struct device_node *dn)
	289	{
46150a05	290	#ifdef CONFIG_PROC_DEVICETREE
ab519a01 NF	291	struct device_node *parent = dn->parent;
	292	struct property *prop = dn->properties;
	293
ab519a01 NF	294	while (prop) {
	295	remove_proc_entry(prop->name, dn->pde);
	296	prop = prop->next;
	297	}
	298
	299	if (dn->pde)
	300	remove_proc_entry(dn->pde->name, parent->pde);
	301	#endif
	302
3aef19f0	303	pSeries_reconfig_notify(PSERIES_RECONFIG_REMOVE, dn);
ab519a01 NF	304	of_detach_node(dn);
	305	of_node_put(dn); /* Must decrement the refcount */
	306
	307	return 0;
	308	}
	309
	310	#define DR_ENTITY_SENSE 9003
	311	#define DR_ENTITY_PRESENT 1
	312	#define DR_ENTITY_UNUSABLE 2
	313	#define ALLOCATION_STATE 9003
	314	#define ALLOC_UNUSABLE 0
	315	#define ALLOC_USABLE 1
	316	#define ISOLATION_STATE 9001
	317	#define ISOLATE 0
	318	#define UNISOLATE 1
	319
	320	int dlpar_acquire_drc(u32 drc_index)
	321	{
	322	int dr_status, rc;
	323
	324	rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
	325	DR_ENTITY_SENSE, drc_index);
	326	if (rc \|\| dr_status != DR_ENTITY_UNUSABLE)
	327	return -1;
	328
	329	rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_USABLE);
	330	if (rc)
	331	return rc;
	332
	333	rc = rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
	334	if (rc) {
	335	rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
	336	return rc;
	337	}
	338
	339	return 0;
	340	}
	341
	342	int dlpar_release_drc(u32 drc_index)
	343	{
	344	int dr_status, rc;
	345
	346	rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
	347	DR_ENTITY_SENSE, drc_index);
	348	if (rc \|\| dr_status != DR_ENTITY_PRESENT)
	349	return -1;
	350
	351	rc = rtas_set_indicator(ISOLATION_STATE, drc_index, ISOLATE);
	352	if (rc)
	353	return rc;
	354
	355	rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
	356	if (rc) {
	357	rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
	358	return rc;
	359	}
	360
	361	return 0;
	362	}
	363
1a8061c4	364	#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
ab519a01	365
275a64f6 NF	366	static int dlpar_online_cpu(struct device_node *dn)
	367	{
	368	int rc = 0;
	369	unsigned int cpu;
	370	int len, nthreads, i;
	371	const u32 *intserv;
	372
	373	intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
	374	if (!intserv)
	375	return -EINVAL;
	376
	377	nthreads = len / sizeof(u32);
	378
	379	cpu_maps_update_begin();
	380	for (i = 0; i < nthreads; i++) {
	381	for_each_present_cpu(cpu) {
	382	if (get_hard_smp_processor_id(cpu) != intserv[i])
	383	continue;
	384	BUG_ON(get_cpu_current_state(cpu)
	385	!= CPU_STATE_OFFLINE);
	386	cpu_maps_update_done();
	387	rc = cpu_up(cpu);
	388	if (rc)
	389	goto out;
	390	cpu_maps_update_begin();
	391
	392	break;
	393	}
	394	if (cpu == num_possible_cpus())
	395	printk(KERN_WARNING "Could not find cpu to online "
	396	"with physical id 0x%x\n", intserv[i]);
	397	}
	398	cpu_maps_update_done();
	399
	400	out:
	401	return rc;
	402
	403	}
	404
1a8061c4 NF	405	static ssize_t dlpar_cpu_probe(const char *buf, size_t count)
	406	{
	407	struct device_node *dn;
	408	unsigned long drc_index;
	409	char *cpu_name;
	410	int rc;
	411
51badebd	412	cpu_hotplug_driver_lock();
1a8061c4	413	rc = strict_strtoul(buf, 0, &drc_index);
51badebd GS	414	if (rc) {
	415	rc = -EINVAL;
	416	goto out;
	417	}
1a8061c4 NF	418
1a8061c4 NF	419	dn = dlpar_configure_connector(drc_index);
51badebd GS	420	if (!dn) {
	421	rc = -EINVAL;
	422	goto out;
	423	}
1a8061c4 NF	424
	425	/* configure-connector reports cpus as living in the base
	426	* directory of the device tree. CPUs actually live in the
	427	* cpus directory so we need to fixup the full_name.
	428	*/
43caa61f	429	cpu_name = kasprintf(GFP_KERNEL, "/cpus%s", dn->full_name);
1a8061c4 NF	430	if (!cpu_name) {
1a8061c4 NF	431	dlpar_free_cc_nodes(dn);
51badebd GS	432	rc = -ENOMEM;
51badebd GS	433	goto out;
1a8061c4 NF	434	}
1a8061c4 NF	435
1a8061c4 NF	436	kfree(dn->full_name);
	437	dn->full_name = cpu_name;
	438
	439	rc = dlpar_acquire_drc(drc_index);
	440	if (rc) {
	441	dlpar_free_cc_nodes(dn);
51badebd GS	442	rc = -EINVAL;
51badebd GS	443	goto out;
1a8061c4 NF	444	}
	445
	446	rc = dlpar_attach_node(dn);
	447	if (rc) {
	448	dlpar_release_drc(drc_index);
	449	dlpar_free_cc_nodes(dn);
a7df5c5e	450	goto out;
1a8061c4 NF	451	}
1a8061c4 NF	452
275a64f6	453	rc = dlpar_online_cpu(dn);
51badebd GS	454	out:
51badebd GS	455	cpu_hotplug_driver_unlock();
b6db63d1	456
1a8061c4 NF	457	return rc ? rc : count;
	458	}
	459
275a64f6 NF	460	static int dlpar_offline_cpu(struct device_node *dn)
	461	{
	462	int rc = 0;
	463	unsigned int cpu;
	464	int len, nthreads, i;
	465	const u32 *intserv;
	466
	467	intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
	468	if (!intserv)
	469	return -EINVAL;
	470
	471	nthreads = len / sizeof(u32);
	472
	473	cpu_maps_update_begin();
	474	for (i = 0; i < nthreads; i++) {
	475	for_each_present_cpu(cpu) {
	476	if (get_hard_smp_processor_id(cpu) != intserv[i])
	477	continue;
	478
	479	if (get_cpu_current_state(cpu) == CPU_STATE_OFFLINE)
	480	break;
	481
	482	if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) {
ceddee23	483	set_preferred_offline_state(cpu, CPU_STATE_OFFLINE);
275a64f6 NF	484	cpu_maps_update_done();
	485	rc = cpu_down(cpu);
	486	if (rc)
	487	goto out;
	488	cpu_maps_update_begin();
	489	break;
	490
	491	}
	492
	493	/*
	494	* The cpu is in CPU_STATE_INACTIVE.
	495	* Upgrade it's state to CPU_STATE_OFFLINE.
	496	*/
	497	set_preferred_offline_state(cpu, CPU_STATE_OFFLINE);
	498	BUG_ON(plpar_hcall_norets(H_PROD, intserv[i])
	499	!= H_SUCCESS);
	500	__cpu_die(cpu);
	501	break;
	502	}
	503	if (cpu == num_possible_cpus())
	504	printk(KERN_WARNING "Could not find cpu to offline "
	505	"with physical id 0x%x\n", intserv[i]);
	506	}
	507	cpu_maps_update_done();
	508
	509	out:
	510	return rc;
	511
	512	}
	513
1a8061c4 NF	514	static ssize_t dlpar_cpu_release(const char *buf, size_t count)
	515	{
	516	struct device_node *dn;
	517	const u32 *drc_index;
	518	int rc;
	519
	520	dn = of_find_node_by_path(buf);
	521	if (!dn)
	522	return -EINVAL;
	523
	524	drc_index = of_get_property(dn, "ibm,my-drc-index", NULL);
	525	if (!drc_index) {
	526	of_node_put(dn);
	527	return -EINVAL;
	528	}
	529
51badebd	530	cpu_hotplug_driver_lock();
275a64f6	531	rc = dlpar_offline_cpu(dn);
b6db63d1 GS	532	if (rc) {
b6db63d1 GS	533	of_node_put(dn);
51badebd GS	534	rc = -EINVAL;
51badebd GS	535	goto out;
b6db63d1 GS	536	}
b6db63d1 GS	537
1a8061c4 NF	538	rc = dlpar_release_drc(*drc_index);
	539	if (rc) {
	540	of_node_put(dn);
51badebd	541	goto out;
1a8061c4 NF	542	}
	543
	544	rc = dlpar_detach_node(dn);
	545	if (rc) {
	546	dlpar_acquire_drc(*drc_index);
51badebd	547	goto out;
1a8061c4 NF	548	}
	549
	550	of_node_put(dn);
51badebd GS	551	out:
	552	cpu_hotplug_driver_unlock();
	553	return rc ? rc : count;
1a8061c4 NF	554	}
	555
	556	static int __init pseries_dlpar_init(void)
	557	{
	558	ppc_md.cpu_probe = dlpar_cpu_probe;
	559	ppc_md.cpu_release = dlpar_cpu_release;
	560
	561	return 0;
	562	}
	563	machine_device_initcall(pseries, pseries_dlpar_init);
	564
	565	#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */