[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/notifier.h>
#include <linux/spinlock.h>
#include <linux/cpu.h>
#include <linux/slab.h>
#include <linux/of.h>
#include "offline_states.h"

#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/uaccess.h>
#include <asm/rtas.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,
					       const char *path)
{
	struct device_node *dn;
	char *name;

	/* If parent node path is "/" advance path to NULL terminator to
	 * prevent double leading slashs in full_name.
	 */
	if (!path[1])
		path++;

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

	name = (char *)ccwa + ccwa->name_offset;
	dn->full_name = kasprintf(GFP_KERNEL, "%s/%s", path, name);
	if (!dn->full_name) {
		kfree(dn);
		return NULL;
	}

	of_node_set_flag(dn, OF_DYNAMIC);

	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 *parent)
{
	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;
	const char *parent_path = parent->full_name;
	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, parent_path);
			if (!dn)
				goto cc_error;

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

		case NEXT_CHILD:
			if (first_dn)
				parent_path = last_dn->full_name;

			dn = dlpar_parse_cc_node(ccwa, parent_path);
			if (!dn)
				goto cc_error;

			if (!first_dn) {
				dn->parent = parent;
				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;
			parent_path = last_dn->parent->full_name;
			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)
{
	int rc;

	dn->parent = derive_parent(dn->full_name);
	if (!dn->parent)
		return -ENOMEM;

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

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

int dlpar_detach_node(struct device_node *dn)
{
	struct device_node *child;
	int rc;

	child = of_get_next_child(dn, NULL);
	while (child) {
		dlpar_detach_node(child);
		child = of_get_next_child(dn, child);
	}

	rc = of_detach_node(dn);
	if (rc)
		return rc;

	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, *parent;
	unsigned long drc_index;
	int rc;

	rc = strict_strtoul(buf, 0, &drc_index);
	if (rc)
		return -EINVAL;

	parent = of_find_node_by_path("/cpus");
	if (!parent)
		return -ENODEV;

	dn = dlpar_configure_connector(drc_index, parent);
	if (!dn)
		return -EINVAL;

	of_node_put(parent);

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

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

	rc = dlpar_online_cpu(dn);
	if (rc)
		return rc;

	return 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;
	}

	rc = dlpar_offline_cpu(dn);
	if (rc) {
		of_node_put(dn);
		return -EINVAL;
	}

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

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

	of_node_put(dn);

	return 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>
ab519a01	14	#include <linux/notifier.h>
ab519a01 NF	15	#include <linux/spinlock.h>
ab519a01 NF	16	#include <linux/cpu.h>
5a0e3ad6	17	#include <linux/slab.h>
1cf3d8b3	18	#include <linux/of.h>
b6db63d1	19	#include "offline_states.h"
ab519a01 NF	20
	21	#include <asm/prom.h>
	22	#include <asm/machdep.h>
	23	#include <asm/uaccess.h>
	24	#include <asm/rtas.h>
ab519a01 NF	25
	26	struct cc_workarea {
	27	u32 drc_index;
	28	u32 zero;
	29	u32 name_offset;
	30	u32 prop_length;
	31	u32 prop_offset;
	32	};
	33
20648974	34	void dlpar_free_cc_property(struct property *prop)
ab519a01 NF	35	{
	36	kfree(prop->name);
	37	kfree(prop->value);
	38	kfree(prop);
	39	}
	40
	41	static struct property dlpar_parse_cc_property(struct cc_workarea ccwa)
	42	{
	43	struct property *prop;
	44	char *name;
	45	char *value;
	46
	47	prop = kzalloc(sizeof(*prop), GFP_KERNEL);
	48	if (!prop)
	49	return NULL;
	50
	51	name = (char *)ccwa + ccwa->name_offset;
	52	prop->name = kstrdup(name, GFP_KERNEL);
	53
	54	prop->length = ccwa->prop_length;
	55	value = (char *)ccwa + ccwa->prop_offset;
e72ed6b5	56	prop->value = kmemdup(value, prop->length, GFP_KERNEL);
ab519a01 NF	57	if (!prop->value) {
	58	dlpar_free_cc_property(prop);
	59	return NULL;
	60	}
	61
ab519a01 NF	62	return prop;
	63	}
	64
8d5ff320 TD	65	static struct device_node dlpar_parse_cc_node(struct cc_workarea ccwa,
8d5ff320 TD	66	const char *path)
ab519a01 NF	67	{
	68	struct device_node *dn;
	69	char *name;
	70
8d5ff320 TD	71	/* If parent node path is "/" advance path to NULL terminator to
	72	* prevent double leading slashs in full_name.
	73	*/
	74	if (!path[1])
	75	path++;
	76
ab519a01 NF	77	dn = kzalloc(sizeof(*dn), GFP_KERNEL);
	78	if (!dn)
	79	return NULL;
	80
ab519a01	81	name = (char *)ccwa + ccwa->name_offset;
8d5ff320	82	dn->full_name = kasprintf(GFP_KERNEL, "%s/%s", path, name);
ab519a01 NF	83	if (!dn->full_name) {
	84	kfree(dn);
	85	return NULL;
	86	}
	87
1578cb76	88	of_node_set_flag(dn, OF_DYNAMIC);
1578cb76	89
ab519a01 NF	90	return dn;
	91	}
	92
	93	static void dlpar_free_one_cc_node(struct device_node *dn)
	94	{
	95	struct property *prop;
	96
	97	while (dn->properties) {
	98	prop = dn->properties;
	99	dn->properties = prop->next;
	100	dlpar_free_cc_property(prop);
	101	}
	102
	103	kfree(dn->full_name);
	104	kfree(dn);
	105	}
	106
20648974	107	void dlpar_free_cc_nodes(struct device_node *dn)
ab519a01 NF	108	{
	109	if (dn->child)
	110	dlpar_free_cc_nodes(dn->child);
	111
	112	if (dn->sibling)
	113	dlpar_free_cc_nodes(dn->sibling);
	114
	115	dlpar_free_one_cc_node(dn);
	116	}
	117
9c740025	118	#define COMPLETE 0
ab519a01 NF	119	#define NEXT_SIBLING 1
	120	#define NEXT_CHILD 2
	121	#define NEXT_PROPERTY 3
	122	#define PREV_PARENT 4
	123	#define MORE_MEMORY 5
	124	#define CALL_AGAIN -2
	125	#define ERR_CFG_USE -9003
	126
8d5ff320 TD	127	struct device_node *dlpar_configure_connector(u32 drc_index,
8d5ff320 TD	128	struct device_node *parent)
ab519a01 NF	129	{
	130	struct device_node *dn;
	131	struct device_node *first_dn = NULL;
	132	struct device_node *last_dn = NULL;
	133	struct property *property;
	134	struct property *last_property = NULL;
	135	struct cc_workarea *ccwa;
93f68f1e	136	char *data_buf;
8d5ff320	137	const char *parent_path = parent->full_name;
ab519a01	138	int cc_token;
93f68f1e	139	int rc = -1;
ab519a01 NF	140
	141	cc_token = rtas_token("ibm,configure-connector");
	142	if (cc_token == RTAS_UNKNOWN_SERVICE)
	143	return NULL;
	144
93f68f1e NF	145	data_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
	146	if (!data_buf)
	147	return NULL;
	148
	149	ccwa = (struct cc_workarea *)&data_buf[0];
ab519a01 NF	150	ccwa->drc_index = drc_index;
	151	ccwa->zero = 0;
	152
93f68f1e NF	153	do {
	154	/* Since we release the rtas_data_buf lock between configure
	155	* connector calls we want to re-populate the rtas_data_buffer
	156	* with the contents of the previous call.
	157	*/
	158	spin_lock(&rtas_data_buf_lock);
	159
	160	memcpy(rtas_data_buf, data_buf, RTAS_DATA_BUF_SIZE);
	161	rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL);
	162	memcpy(data_buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
	163
	164	spin_unlock(&rtas_data_buf_lock);
	165
ab519a01	166	switch (rc) {
9c740025 AB	167	case COMPLETE:
	168	break;
	169
ab519a01	170	case NEXT_SIBLING:
8d5ff320	171	dn = dlpar_parse_cc_node(ccwa, parent_path);
ab519a01 NF	172	if (!dn)
	173	goto cc_error;
	174
	175	dn->parent = last_dn->parent;
	176	last_dn->sibling = dn;
	177	last_dn = dn;
	178	break;
	179
	180	case NEXT_CHILD:
8d5ff320 TD	181	if (first_dn)
	182	parent_path = last_dn->full_name;
	183
	184	dn = dlpar_parse_cc_node(ccwa, parent_path);
ab519a01 NF	185	if (!dn)
	186	goto cc_error;
	187
8d5ff320 TD	188	if (!first_dn) {
8d5ff320 TD	189	dn->parent = parent;
ab519a01	190	first_dn = dn;
8d5ff320	191	} else {
ab519a01 NF	192	dn->parent = last_dn;
	193	if (last_dn)
	194	last_dn->child = dn;
	195	}
	196
	197	last_dn = dn;
	198	break;
	199
	200	case NEXT_PROPERTY:
	201	property = dlpar_parse_cc_property(ccwa);
	202	if (!property)
	203	goto cc_error;
	204
	205	if (!last_dn->properties)
	206	last_dn->properties = property;
	207	else
	208	last_property->next = property;
	209
	210	last_property = property;
	211	break;
	212
	213	case PREV_PARENT:
	214	last_dn = last_dn->parent;
8d5ff320	215	parent_path = last_dn->parent->full_name;
ab519a01 NF	216	break;
	217
	218	case CALL_AGAIN:
	219	break;
	220
	221	case MORE_MEMORY:
	222	case ERR_CFG_USE:
	223	default:
	224	printk(KERN_ERR "Unexpected Error (%d) "
	225	"returned from configure-connector\n", rc);
	226	goto cc_error;
	227	}
93f68f1e	228	} while (rc);
ab519a01	229
93f68f1e NF	230	cc_error:
	231	kfree(data_buf);
	232
	233	if (rc) {
	234	if (first_dn)
	235	dlpar_free_cc_nodes(first_dn);
	236
	237	return NULL;
ab519a01 NF	238	}
ab519a01 NF	239
ab519a01	240	return first_dn;
ab519a01 NF	241	}
	242
	243	static struct device_node derive_parent(const char path)
	244	{
	245	struct device_node *parent;
	246	char *last_slash;
	247
	248	last_slash = strrchr(path, '/');
	249	if (last_slash == path) {
	250	parent = of_find_node_by_path("/");
	251	} else {
	252	char *parent_path;
	253	int parent_path_len = last_slash - path + 1;
	254	parent_path = kmalloc(parent_path_len, GFP_KERNEL);
	255	if (!parent_path)
	256	return NULL;
	257
	258	strlcpy(parent_path, path, parent_path_len);
	259	parent = of_find_node_by_path(parent_path);
	260	kfree(parent_path);
	261	}
	262
	263	return parent;
	264	}
	265
	266	int dlpar_attach_node(struct device_node *dn)
	267	{
ab519a01 NF	268	int rc;
ab519a01 NF	269
ab519a01 NF	270	dn->parent = derive_parent(dn->full_name);
	271	if (!dn->parent)
	272	return -ENOMEM;
	273
1cf3d8b3	274	rc = of_attach_node(dn);
3aef19f0	275	if (rc) {
ab519a01 NF	276	printk(KERN_ERR "Failed to add device node %s\n",
ab519a01 NF	277	dn->full_name);
3aef19f0	278	return rc;
ab519a01 NF	279	}
ab519a01 NF	280
ab519a01 NF	281	of_node_put(dn->parent);
	282	return 0;
	283	}
	284
	285	int dlpar_detach_node(struct device_node *dn)
	286	{
5935ff43	287	struct device_node *child;
1cf3d8b3	288	int rc;
ab519a01	289
5935ff43 TD	290	child = of_get_next_child(dn, NULL);
	291	while (child) {
	292	dlpar_detach_node(child);
	293	child = of_get_next_child(dn, child);
	294	}
	295
1cf3d8b3 NF	296	rc = of_detach_node(dn);
	297	if (rc)
	298	return rc;
	299
	300	of_node_put(dn); /* Must decrement the refcount */
ab519a01 NF	301	return 0;
	302	}
	303
	304	#define DR_ENTITY_SENSE 9003
	305	#define DR_ENTITY_PRESENT 1
	306	#define DR_ENTITY_UNUSABLE 2
	307	#define ALLOCATION_STATE 9003
	308	#define ALLOC_UNUSABLE 0
	309	#define ALLOC_USABLE 1
	310	#define ISOLATION_STATE 9001
	311	#define ISOLATE 0
	312	#define UNISOLATE 1
	313
	314	int dlpar_acquire_drc(u32 drc_index)
	315	{
	316	int dr_status, rc;
	317
	318	rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
	319	DR_ENTITY_SENSE, drc_index);
	320	if (rc \|\| dr_status != DR_ENTITY_UNUSABLE)
	321	return -1;
	322
	323	rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_USABLE);
	324	if (rc)
	325	return rc;
	326
	327	rc = rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
	328	if (rc) {
	329	rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
	330	return rc;
	331	}
	332
	333	return 0;
	334	}
	335
	336	int dlpar_release_drc(u32 drc_index)
	337	{
	338	int dr_status, rc;
	339
	340	rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
	341	DR_ENTITY_SENSE, drc_index);
	342	if (rc \|\| dr_status != DR_ENTITY_PRESENT)
	343	return -1;
	344
	345	rc = rtas_set_indicator(ISOLATION_STATE, drc_index, ISOLATE);
	346	if (rc)
	347	return rc;
	348
	349	rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
	350	if (rc) {
	351	rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
	352	return rc;
	353	}
	354
	355	return 0;
	356	}
	357
1a8061c4	358	#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
ab519a01	359
275a64f6 NF	360	static int dlpar_online_cpu(struct device_node *dn)
	361	{
	362	int rc = 0;
	363	unsigned int cpu;
	364	int len, nthreads, i;
	365	const u32 *intserv;
	366
	367	intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
	368	if (!intserv)
	369	return -EINVAL;
	370
	371	nthreads = len / sizeof(u32);
	372
	373	cpu_maps_update_begin();
	374	for (i = 0; i < nthreads; i++) {
	375	for_each_present_cpu(cpu) {
	376	if (get_hard_smp_processor_id(cpu) != intserv[i])
	377	continue;
	378	BUG_ON(get_cpu_current_state(cpu)
	379	!= CPU_STATE_OFFLINE);
	380	cpu_maps_update_done();
	381	rc = cpu_up(cpu);
	382	if (rc)
	383	goto out;
	384	cpu_maps_update_begin();
	385
	386	break;
	387	}
	388	if (cpu == num_possible_cpus())
	389	printk(KERN_WARNING "Could not find cpu to online "
	390	"with physical id 0x%x\n", intserv[i]);
	391	}
	392	cpu_maps_update_done();
	393
	394	out:
	395	return rc;
	396
	397	}
	398
1a8061c4 NF	399	static ssize_t dlpar_cpu_probe(const char *buf, size_t count)
1a8061c4 NF	400	{
8d5ff320	401	struct device_node dn, parent;
1a8061c4	402	unsigned long drc_index;
1a8061c4 NF	403	int rc;
	404
	405	rc = strict_strtoul(buf, 0, &drc_index);
6dedcca6 TK	406	if (rc)
6dedcca6 TK	407	return -EINVAL;
1a8061c4	408
8d5ff320	409	parent = of_find_node_by_path("/cpus");
6dedcca6 TK	410	if (!parent)
6dedcca6 TK	411	return -ENODEV;
1a8061c4	412
8d5ff320	413	dn = dlpar_configure_connector(drc_index, parent);
6dedcca6 TK	414	if (!dn)
6dedcca6 TK	415	return -EINVAL;
1a8061c4	416
8d5ff320	417	of_node_put(parent);
1a8061c4 NF	418
	419	rc = dlpar_acquire_drc(drc_index);
	420	if (rc) {
	421	dlpar_free_cc_nodes(dn);
6dedcca6	422	return -EINVAL;
1a8061c4 NF	423	}
	424
	425	rc = dlpar_attach_node(dn);
	426	if (rc) {
	427	dlpar_release_drc(drc_index);
	428	dlpar_free_cc_nodes(dn);
6dedcca6	429	return rc;
1a8061c4 NF	430	}
1a8061c4 NF	431
275a64f6	432	rc = dlpar_online_cpu(dn);
6dedcca6 TK	433	if (rc)
6dedcca6 TK	434	return rc;
b6db63d1	435
6dedcca6	436	return count;
1a8061c4 NF	437	}
1a8061c4 NF	438
275a64f6 NF	439	static int dlpar_offline_cpu(struct device_node *dn)
	440	{
	441	int rc = 0;
	442	unsigned int cpu;
	443	int len, nthreads, i;
	444	const u32 *intserv;
	445
	446	intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
	447	if (!intserv)
	448	return -EINVAL;
	449
	450	nthreads = len / sizeof(u32);
	451
	452	cpu_maps_update_begin();
	453	for (i = 0; i < nthreads; i++) {
	454	for_each_present_cpu(cpu) {
	455	if (get_hard_smp_processor_id(cpu) != intserv[i])
	456	continue;
	457
	458	if (get_cpu_current_state(cpu) == CPU_STATE_OFFLINE)
	459	break;
	460
	461	if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) {
ceddee23	462	set_preferred_offline_state(cpu, CPU_STATE_OFFLINE);
275a64f6 NF	463	cpu_maps_update_done();
	464	rc = cpu_down(cpu);
	465	if (rc)
	466	goto out;
	467	cpu_maps_update_begin();
	468	break;
	469
	470	}
	471
	472	/*
	473	* The cpu is in CPU_STATE_INACTIVE.
	474	* Upgrade it's state to CPU_STATE_OFFLINE.
	475	*/
	476	set_preferred_offline_state(cpu, CPU_STATE_OFFLINE);
	477	BUG_ON(plpar_hcall_norets(H_PROD, intserv[i])
	478	!= H_SUCCESS);
	479	__cpu_die(cpu);
	480	break;
	481	}
	482	if (cpu == num_possible_cpus())
	483	printk(KERN_WARNING "Could not find cpu to offline "
	484	"with physical id 0x%x\n", intserv[i]);
	485	}
	486	cpu_maps_update_done();
	487
	488	out:
	489	return rc;
	490
	491	}
	492
1a8061c4 NF	493	static ssize_t dlpar_cpu_release(const char *buf, size_t count)
	494	{
	495	struct device_node *dn;
	496	const u32 *drc_index;
	497	int rc;
	498
	499	dn = of_find_node_by_path(buf);
	500	if (!dn)
	501	return -EINVAL;
	502
	503	drc_index = of_get_property(dn, "ibm,my-drc-index", NULL);
	504	if (!drc_index) {
	505	of_node_put(dn);
	506	return -EINVAL;
	507	}
	508
275a64f6	509	rc = dlpar_offline_cpu(dn);
b6db63d1 GS	510	if (rc) {
b6db63d1 GS	511	of_node_put(dn);
6dedcca6	512	return -EINVAL;
b6db63d1 GS	513	}
b6db63d1 GS	514
1a8061c4 NF	515	rc = dlpar_release_drc(*drc_index);
	516	if (rc) {
	517	of_node_put(dn);
6dedcca6	518	return rc;
1a8061c4 NF	519	}
	520
	521	rc = dlpar_detach_node(dn);
	522	if (rc) {
	523	dlpar_acquire_drc(*drc_index);
6dedcca6	524	return rc;
1a8061c4 NF	525	}
	526
	527	of_node_put(dn);
6dedcca6 TK	528
6dedcca6 TK	529	return count;
1a8061c4 NF	530	}
	531
	532	static int __init pseries_dlpar_init(void)
	533	{
	534	ppc_md.cpu_probe = dlpar_cpu_probe;
	535	ppc_md.cpu_release = dlpar_cpu_release;
	536
	537	return 0;
	538	}
	539	machine_device_initcall(pseries, pseries_dlpar_init);
	540
	541	#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */