[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;
};

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 = 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);
}

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 = 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) {
				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;
43caa61f	82	dn->full_name = kasprintf(GFP_KERNEL, "/%s", name);
ab519a01 NF	83	if (!dn->full_name) {
	84	kfree(dn);
	85	return NULL;
	86	}
	87
ab519a01 NF	88	return dn;
	89	}
	90
	91	static void dlpar_free_one_cc_node(struct device_node *dn)
	92	{
	93	struct property *prop;
	94
	95	while (dn->properties) {
	96	prop = dn->properties;
	97	dn->properties = prop->next;
	98	dlpar_free_cc_property(prop);
	99	}
	100
	101	kfree(dn->full_name);
	102	kfree(dn);
	103	}
	104
	105	static void dlpar_free_cc_nodes(struct device_node *dn)
	106	{
	107	if (dn->child)
	108	dlpar_free_cc_nodes(dn->child);
	109
	110	if (dn->sibling)
	111	dlpar_free_cc_nodes(dn->sibling);
	112
	113	dlpar_free_one_cc_node(dn);
	114	}
	115
	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;
	132	int cc_token;
	133	int rc;
	134
	135	cc_token = rtas_token("ibm,configure-connector");
	136	if (cc_token == RTAS_UNKNOWN_SERVICE)
	137	return NULL;
	138
	139	spin_lock(&rtas_data_buf_lock);
	140	ccwa = (struct cc_workarea *)&rtas_data_buf[0];
	141	ccwa->drc_index = drc_index;
	142	ccwa->zero = 0;
	143
	144	rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL);
	145	while (rc) {
	146	switch (rc) {
	147	case NEXT_SIBLING:
	148	dn = dlpar_parse_cc_node(ccwa);
	149	if (!dn)
	150	goto cc_error;
	151
152	dn->parent = last_dn->parent;
153	last_dn->sibling = dn;
154	last_dn = dn;
155	break;
156
157	case NEXT_CHILD:
158	dn = dlpar_parse_cc_node(ccwa);
159	if (!dn)
160	goto cc_error;
161
162	if (!first_dn)
163	first_dn = dn;
164	else {
165	dn->parent = last_dn;
166	if (last_dn)
167	last_dn->child = dn;
168	}
169
170	last_dn = dn;
171	break;
172
173	case NEXT_PROPERTY:
174	property = dlpar_parse_cc_property(ccwa);
175	if (!property)
176	goto cc_error;
177
178	if (!last_dn->properties)
179	last_dn->properties = property;
180	else
181	last_property->next = property;
182
183	last_property = property;
184	break;
185
186	case PREV_PARENT:
187	last_dn = last_dn->parent;
188	break;
189
190	case CALL_AGAIN:
191	break;
192
193	case MORE_MEMORY:
194	case ERR_CFG_USE:
195	default:
196	printk(KERN_ERR "Unexpected Error (%d) "
197	"returned from configure-connector\n", rc);
198	goto cc_error;
199	}
200
201	rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL);
202	}
203
204	spin_unlock(&rtas_data_buf_lock);
205	return first_dn;
206
207	cc_error:
208	if (first_dn)
209	dlpar_free_cc_nodes(first_dn);
210	spin_unlock(&rtas_data_buf_lock);
211	return NULL;
212	}
213
214	static struct device_node derive_parent(const char path)
215	{
216	struct device_node *parent;
217	char *last_slash;
218
219	last_slash = strrchr(path, '/');
220	if (last_slash == path) {
221	parent = of_find_node_by_path("/");
222	} else {
223	char *parent_path;
224	int parent_path_len = last_slash - path + 1;
225	parent_path = kmalloc(parent_path_len, GFP_KERNEL);
226	if (!parent_path)
227	return NULL;
228
229	strlcpy(parent_path, path, parent_path_len);
230	parent = of_find_node_by_path(parent_path);
231	kfree(parent_path);
232	}
233
234	return parent;
235	}
236
237	int dlpar_attach_node(struct device_node *dn)
238	{
46150a05	239	#ifdef CONFIG_PROC_DEVICETREE
ab519a01	240	struct proc_dir_entry *ent;
46150a05	241	#endif
ab519a01 NF	242	int rc;
	243
	244	of_node_set_flag(dn, OF_DYNAMIC);
	245	kref_init(&dn->kref);
	246	dn->parent = derive_parent(dn->full_name);
	247	if (!dn->parent)
	248	return -ENOMEM;
	249
	250	rc = blocking_notifier_call_chain(&pSeries_reconfig_chain,
	251	PSERIES_RECONFIG_ADD, dn);
	252	if (rc == NOTIFY_BAD) {
	253	printk(KERN_ERR "Failed to add device node %s\n",
	254	dn->full_name);
	255	return -ENOMEM; /* For now, safe to assume kmalloc failure */
	256	}
	257
	258	of_attach_node(dn);
	259
	260	#ifdef CONFIG_PROC_DEVICETREE
	261	ent = proc_mkdir(strrchr(dn->full_name, '/') + 1, dn->parent->pde);
	262	if (ent)
	263	proc_device_tree_add_node(dn, ent);
	264	#endif
	265
	266	of_node_put(dn->parent);
	267	return 0;
	268	}
	269
	270	int dlpar_detach_node(struct device_node *dn)
	271	{
46150a05	272	#ifdef CONFIG_PROC_DEVICETREE
ab519a01 NF	273	struct device_node *parent = dn->parent;
	274	struct property *prop = dn->properties;
	275
ab519a01 NF	276	while (prop) {
	277	remove_proc_entry(prop->name, dn->pde);
	278	prop = prop->next;
	279	}
	280
	281	if (dn->pde)
	282	remove_proc_entry(dn->pde->name, parent->pde);
	283	#endif
	284
	285	blocking_notifier_call_chain(&pSeries_reconfig_chain,
	286	PSERIES_RECONFIG_REMOVE, dn);
	287	of_detach_node(dn);
	288	of_node_put(dn); /* Must decrement the refcount */
	289
	290	return 0;
	291	}
	292
	293	#define DR_ENTITY_SENSE 9003
	294	#define DR_ENTITY_PRESENT 1
	295	#define DR_ENTITY_UNUSABLE 2
	296	#define ALLOCATION_STATE 9003
	297	#define ALLOC_UNUSABLE 0
	298	#define ALLOC_USABLE 1
	299	#define ISOLATION_STATE 9001
	300	#define ISOLATE 0
	301	#define UNISOLATE 1
	302
	303	int dlpar_acquire_drc(u32 drc_index)
	304	{
	305	int dr_status, rc;
	306
	307	rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
	308	DR_ENTITY_SENSE, drc_index);
	309	if (rc \|\| dr_status != DR_ENTITY_UNUSABLE)
	310	return -1;
	311
	312	rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_USABLE);
	313	if (rc)
	314	return rc;
	315
	316	rc = rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
	317	if (rc) {
	318	rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
	319	return rc;
	320	}
	321
	322	return 0;
	323	}
	324
	325	int dlpar_release_drc(u32 drc_index)
	326	{
	327	int dr_status, rc;
	328
	329	rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
	330	DR_ENTITY_SENSE, drc_index);
	331	if (rc \|\| dr_status != DR_ENTITY_PRESENT)
	332	return -1;
	333
	334	rc = rtas_set_indicator(ISOLATION_STATE, drc_index, ISOLATE);
	335	if (rc)
	336	return rc;
	337
	338	rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
	339	if (rc) {
340	rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
341	return rc;
342	}
343
344	return 0;
345	}
346
1a8061c4	347	#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
ab519a01	348
275a64f6 NF	349	static int dlpar_online_cpu(struct device_node *dn)
	350	{
	351	int rc = 0;
	352	unsigned int cpu;
	353	int len, nthreads, i;
	354	const u32 *intserv;
	355
	356	intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
	357	if (!intserv)
	358	return -EINVAL;
	359
	360	nthreads = len / sizeof(u32);
	361
	362	cpu_maps_update_begin();
	363	for (i = 0; i < nthreads; i++) {
	364	for_each_present_cpu(cpu) {
	365	if (get_hard_smp_processor_id(cpu) != intserv[i])
	366	continue;
	367	BUG_ON(get_cpu_current_state(cpu)
	368	!= CPU_STATE_OFFLINE);
	369	cpu_maps_update_done();
	370	rc = cpu_up(cpu);
	371	if (rc)
	372	goto out;
	373	cpu_maps_update_begin();
	374
	375	break;
	376	}
	377	if (cpu == num_possible_cpus())
	378	printk(KERN_WARNING "Could not find cpu to online "
	379	"with physical id 0x%x\n", intserv[i]);
	380	}
	381	cpu_maps_update_done();
	382
	383	out:
	384	return rc;
	385
	386	}
	387
1a8061c4 NF	388	static ssize_t dlpar_cpu_probe(const char *buf, size_t count)
	389	{
	390	struct device_node *dn;
	391	unsigned long drc_index;
	392	char *cpu_name;
	393	int rc;
	394
51badebd	395	cpu_hotplug_driver_lock();
1a8061c4	396	rc = strict_strtoul(buf, 0, &drc_index);
51badebd GS	397	if (rc) {
	398	rc = -EINVAL;
	399	goto out;
	400	}
1a8061c4 NF	401
1a8061c4 NF	402	dn = dlpar_configure_connector(drc_index);
51badebd GS	403	if (!dn) {
	404	rc = -EINVAL;
	405	goto out;
	406	}
1a8061c4 NF	407
	408	/* configure-connector reports cpus as living in the base
	409	* directory of the device tree. CPUs actually live in the
	410	* cpus directory so we need to fixup the full_name.
	411	*/
43caa61f	412	cpu_name = kasprintf(GFP_KERNEL, "/cpus%s", dn->full_name);
1a8061c4 NF	413	if (!cpu_name) {
1a8061c4 NF	414	dlpar_free_cc_nodes(dn);
51badebd GS	415	rc = -ENOMEM;
51badebd GS	416	goto out;
1a8061c4 NF	417	}
1a8061c4 NF	418
1a8061c4 NF	419	kfree(dn->full_name);
	420	dn->full_name = cpu_name;
	421
	422	rc = dlpar_acquire_drc(drc_index);
	423	if (rc) {
	424	dlpar_free_cc_nodes(dn);
51badebd GS	425	rc = -EINVAL;
51badebd GS	426	goto out;
1a8061c4 NF	427	}
	428
	429	rc = dlpar_attach_node(dn);
	430	if (rc) {
	431	dlpar_release_drc(drc_index);
	432	dlpar_free_cc_nodes(dn);
a7df5c5e	433	goto out;
1a8061c4 NF	434	}
1a8061c4 NF	435
275a64f6	436	rc = dlpar_online_cpu(dn);
51badebd GS	437	out:
51badebd GS	438	cpu_hotplug_driver_unlock();
b6db63d1	439
1a8061c4 NF	440	return rc ? rc : count;
	441	}
	442
275a64f6 NF	443	static int dlpar_offline_cpu(struct device_node *dn)
	444	{
	445	int rc = 0;
	446	unsigned int cpu;
	447	int len, nthreads, i;
	448	const u32 *intserv;
	449
	450	intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
	451	if (!intserv)
	452	return -EINVAL;
	453
	454	nthreads = len / sizeof(u32);
	455
	456	cpu_maps_update_begin();
	457	for (i = 0; i < nthreads; i++) {
	458	for_each_present_cpu(cpu) {
	459	if (get_hard_smp_processor_id(cpu) != intserv[i])
	460	continue;
	461
	462	if (get_cpu_current_state(cpu) == CPU_STATE_OFFLINE)
	463	break;
	464
	465	if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) {
	466	cpu_maps_update_done();
	467	rc = cpu_down(cpu);
	468	if (rc)
	469	goto out;
	470	cpu_maps_update_begin();
	471	break;
	472
	473	}
	474
	475	/*
	476	* The cpu is in CPU_STATE_INACTIVE.
	477	* Upgrade it's state to CPU_STATE_OFFLINE.
	478	*/
	479	set_preferred_offline_state(cpu, CPU_STATE_OFFLINE);
	480	BUG_ON(plpar_hcall_norets(H_PROD, intserv[i])
	481	!= H_SUCCESS);
	482	__cpu_die(cpu);
	483	break;
	484	}
	485	if (cpu == num_possible_cpus())
	486	printk(KERN_WARNING "Could not find cpu to offline "
	487	"with physical id 0x%x\n", intserv[i]);
	488	}
	489	cpu_maps_update_done();
	490
	491	out:
	492	return rc;
	493
	494	}
	495
1a8061c4 NF	496	static ssize_t dlpar_cpu_release(const char *buf, size_t count)
	497	{
	498	struct device_node *dn;
	499	const u32 *drc_index;
	500	int rc;
	501
	502	dn = of_find_node_by_path(buf);
	503	if (!dn)
	504	return -EINVAL;
	505
	506	drc_index = of_get_property(dn, "ibm,my-drc-index", NULL);
	507	if (!drc_index) {
	508	of_node_put(dn);
	509	return -EINVAL;
	510	}
	511
51badebd	512	cpu_hotplug_driver_lock();
275a64f6	513	rc = dlpar_offline_cpu(dn);
b6db63d1 GS	514	if (rc) {
b6db63d1 GS	515	of_node_put(dn);
51badebd GS	516	rc = -EINVAL;
51badebd GS	517	goto out;
b6db63d1 GS	518	}
b6db63d1 GS	519
1a8061c4 NF	520	rc = dlpar_release_drc(*drc_index);
	521	if (rc) {
	522	of_node_put(dn);
51badebd	523	goto out;
1a8061c4 NF	524	}
	525
	526	rc = dlpar_detach_node(dn);
	527	if (rc) {
	528	dlpar_acquire_drc(*drc_index);
51badebd	529	goto out;
1a8061c4 NF	530	}
	531
	532	of_node_put(dn);
51badebd GS	533	out:
	534	cpu_hotplug_driver_unlock();
	535	return rc ? rc : count;
1a8061c4 NF	536	}
	537
	538	static int __init pseries_dlpar_init(void)
	539	{
	540	ppc_md.cpu_probe = dlpar_cpu_probe;
	541	ppc_md.cpu_release = dlpar_cpu_release;
	542
	543	return 0;
	544	}
	545	machine_device_initcall(pseries, pseries_dlpar_init);
	546
	547	#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */