[GitHub/mt8127/android_kernel_alcatel_ttab.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;
};

static 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 = kzalloc(prop->length, GFP_KERNEL);
	if (!prop->value) {
		dlpar_free_cc_property(prop);
		return NULL;
	}

	memcpy(prop->value, value, prop->length);
	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
	 * preceeding '/', so we allocate a buffer large enough to
	 * prepend this to the full_name.
	 */
	name = (char *)ccwa + ccwa->name_offset;
	dn->full_name = kmalloc(strlen(name) + 2, GFP_KERNEL);
	if (!dn->full_name) {
		kfree(dn);
		return NULL;
	}

	sprintf(dn->full_name, "/%s", name);
	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);
}

static 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 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;
	int cc_token;
	int rc;

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

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

	rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL);
	while (rc) {
		switch (rc) {
		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;
		}

		rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL);
	}

	spin_unlock(&rtas_data_buf_lock);
	return first_dn;

cc_error:
	if (first_dn)
		dlpar_free_cc_nodes(first_dn);
	spin_unlock(&rtas_data_buf_lock);
	return NULL;
}

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 = blocking_notifier_call_chain(&pSeries_reconfig_chain,
					  PSERIES_RECONFIG_ADD, dn);
	if (rc == NOTIFY_BAD) {
		printk(KERN_ERR "Failed to add device node %s\n",
		       dn->full_name);
		return -ENOMEM; /* For now, safe to assume kmalloc failure */
	}

	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

	blocking_notifier_call_chain(&pSeries_reconfig_chain,
			    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 = kzalloc(strlen(dn->full_name) + strlen("/cpus") + 1,
			   GFP_KERNEL);
	if (!cpu_name) {
		dlpar_free_cc_nodes(dn);
		rc = -ENOMEM;
		goto out;
	}

	sprintf(cpu_name, "/cpus%s", dn->full_name);
	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);
	}

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