arch/powerpc/platforms/pseries/dlpar.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * 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
  */

 #define pr_fmt(fmt)	"dlpar: " fmt

 #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 "of_helpers.h"
 #include "pseries.h"

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

 static struct workqueue_struct *pseries_hp_wq;

 struct pseries_hp_work {
 	struct work_struct work;
 	struct pseries_hp_errorlog *errlog;
 };

 struct cc_workarea {
 	__be32	drc_index;
 	__be32	zero;
 	__be32	name_offset;
 	__be32	prop_length;
 	__be32	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 + be32_to_cpu(ccwa->name_offset);
 	prop->name = kstrdup(name, GFP_KERNEL);
 	if (!prop->name) {
 		dlpar_free_cc_property(prop);
 		return NULL;
 	}

 	prop->length = be32_to_cpu(ccwa->prop_length);
 	value = (char *)ccwa + be32_to_cpu(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;
 	const char *name;

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

 	name = (const char *)ccwa + be32_to_cpu(ccwa->name_offset);
 	dn->full_name = kstrdup(name, GFP_KERNEL);
 	if (!dn->full_name) {
 		kfree(dn);
 		return NULL;
 	}

 	of_node_set_flag(dn, OF_DYNAMIC);
 	of_node_init(dn);

 	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 ERR_CFG_USE     -9003

 struct device_node *dlpar_configure_connector(__be32 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;
 	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);

 		if (rtas_busy_delay(rc))
 			continue;

 		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) {
 				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;
 			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;
 }

 int dlpar_attach_node(struct device_node *dn, struct device_node *parent)
 {
 	int rc;

 	dn->parent = parent;

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

 	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);

 	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_get_sensor(DR_ENTITY_SENSE, drc_index, &dr_status);
 	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_get_sensor(DR_ENTITY_SENSE, drc_index, &dr_status);
 	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;
 }

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

 	rc = rtas_get_sensor(DR_ENTITY_SENSE, drc_index, &dr_status);
 	if (rc || dr_status != DR_ENTITY_PRESENT)
 		return -1;

 	rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);

 	return 0;
 }

 int handle_dlpar_errorlog(struct pseries_hp_errorlog *hp_elog)
 {
 	int rc;

 	/* pseries error logs are in BE format, convert to cpu type */
 	switch (hp_elog->id_type) {
 	case PSERIES_HP_ELOG_ID_DRC_COUNT:
 		hp_elog->_drc_u.drc_count =
 				be32_to_cpu(hp_elog->_drc_u.drc_count);
 		break;
 	case PSERIES_HP_ELOG_ID_DRC_INDEX:
 		hp_elog->_drc_u.drc_index =
 				be32_to_cpu(hp_elog->_drc_u.drc_index);
 		break;
 	case PSERIES_HP_ELOG_ID_DRC_IC:
 		hp_elog->_drc_u.ic.count =
 				be32_to_cpu(hp_elog->_drc_u.ic.count);
 		hp_elog->_drc_u.ic.index =
 				be32_to_cpu(hp_elog->_drc_u.ic.index);
 	}

 	switch (hp_elog->resource) {
 	case PSERIES_HP_ELOG_RESOURCE_MEM:
 		rc = dlpar_memory(hp_elog);
 		break;
 	case PSERIES_HP_ELOG_RESOURCE_CPU:
 		rc = dlpar_cpu(hp_elog);
 		break;
 	case PSERIES_HP_ELOG_RESOURCE_PMEM:
 		rc = dlpar_hp_pmem(hp_elog);
 		break;

 	default:
 		pr_warn_ratelimited("Invalid resource (%d) specified\n",
 				    hp_elog->resource);
 		rc = -EINVAL;
 	}

 	return rc;
 }

 static void pseries_hp_work_fn(struct work_struct *work)
 {
 	struct pseries_hp_work *hp_work =
 			container_of(work, struct pseries_hp_work, work);

 	handle_dlpar_errorlog(hp_work->errlog);

 	kfree(hp_work->errlog);
 	kfree((void *)work);
 }

 void queue_hotplug_event(struct pseries_hp_errorlog *hp_errlog)
 {
 	struct pseries_hp_work *work;
 	struct pseries_hp_errorlog *hp_errlog_copy;

 	hp_errlog_copy = kmemdup(hp_errlog, sizeof(*hp_errlog), GFP_ATOMIC);
 	if (!hp_errlog_copy)
 		return;

 	work = kmalloc(sizeof(struct pseries_hp_work), GFP_ATOMIC);
 	if (work) {
 		INIT_WORK((struct work_struct *)work, pseries_hp_work_fn);
 		work->errlog = hp_errlog_copy;
 		queue_work(pseries_hp_wq, (struct work_struct *)work);
 	} else {
 		kfree(hp_errlog_copy);
 	}
 }

 static int dlpar_parse_resource(char **cmd, struct pseries_hp_errorlog *hp_elog)
 {
 	char *arg;

 	arg = strsep(cmd, " ");
 	if (!arg)
 		return -EINVAL;

 	if (sysfs_streq(arg, "memory")) {
 		hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_MEM;
 	} else if (sysfs_streq(arg, "cpu")) {
 		hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_CPU;
 	} else {
 		pr_err("Invalid resource specified.\n");
 		return -EINVAL;
 	}

 	return 0;
 }

 static int dlpar_parse_action(char **cmd, struct pseries_hp_errorlog *hp_elog)
 {
 	char *arg;

 	arg = strsep(cmd, " ");
 	if (!arg)
 		return -EINVAL;

 	if (sysfs_streq(arg, "add")) {
 		hp_elog->action = PSERIES_HP_ELOG_ACTION_ADD;
 	} else if (sysfs_streq(arg, "remove")) {
 		hp_elog->action = PSERIES_HP_ELOG_ACTION_REMOVE;
 	} else {
 		pr_err("Invalid action specified.\n");
 		return -EINVAL;
 	}

 	return 0;
 }

 static int dlpar_parse_id_type(char **cmd, struct pseries_hp_errorlog *hp_elog)
 {
 	char *arg;
 	u32 count, index;

 	arg = strsep(cmd, " ");
 	if (!arg)
 		return -EINVAL;

 	if (sysfs_streq(arg, "indexed-count")) {
 		hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_IC;
 		arg = strsep(cmd, " ");
 		if (!arg) {
 			pr_err("No DRC count specified.\n");
 			return -EINVAL;
 		}

 		if (kstrtou32(arg, 0, &count)) {
 			pr_err("Invalid DRC count specified.\n");
 			return -EINVAL;
 		}

 		arg = strsep(cmd, " ");
 		if (!arg) {
 			pr_err("No DRC Index specified.\n");
 			return -EINVAL;
 		}

 		if (kstrtou32(arg, 0, &index)) {
 			pr_err("Invalid DRC Index specified.\n");
 			return -EINVAL;
 		}

 		hp_elog->_drc_u.ic.count = cpu_to_be32(count);
 		hp_elog->_drc_u.ic.index = cpu_to_be32(index);
 	} else if (sysfs_streq(arg, "index")) {
 		hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_INDEX;
 		arg = strsep(cmd, " ");
 		if (!arg) {
 			pr_err("No DRC Index specified.\n");
 			return -EINVAL;
 		}

 		if (kstrtou32(arg, 0, &index)) {
 			pr_err("Invalid DRC Index specified.\n");
 			return -EINVAL;
 		}

 		hp_elog->_drc_u.drc_index = cpu_to_be32(index);
 	} else if (sysfs_streq(arg, "count")) {
 		hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_COUNT;
 		arg = strsep(cmd, " ");
 		if (!arg) {
 			pr_err("No DRC count specified.\n");
 			return -EINVAL;
 		}

 		if (kstrtou32(arg, 0, &count)) {
 			pr_err("Invalid DRC count specified.\n");
 			return -EINVAL;
 		}

 		hp_elog->_drc_u.drc_count = cpu_to_be32(count);
 	} else {
 		pr_err("Invalid id_type specified.\n");
 		return -EINVAL;
 	}

 	return 0;
 }

 static ssize_t dlpar_store(struct class *class, struct class_attribute *attr,
 			   const char *buf, size_t count)
 {
 	struct pseries_hp_errorlog hp_elog;
 	char *argbuf;
 	char *args;
 	int rc;

 	args = argbuf = kstrdup(buf, GFP_KERNEL);
 	if (!argbuf)
 		return -ENOMEM;

 	/*
 	 * Parse out the request from the user, this will be in the form:
 	 * <resource> <action> <id_type> <id>
 	 */
 	rc = dlpar_parse_resource(&args, &hp_elog);
 	if (rc)
 		goto dlpar_store_out;

 	rc = dlpar_parse_action(&args, &hp_elog);
 	if (rc)
 		goto dlpar_store_out;

 	rc = dlpar_parse_id_type(&args, &hp_elog);
 	if (rc)
 		goto dlpar_store_out;

 	rc = handle_dlpar_errorlog(&hp_elog);

 dlpar_store_out:
 	kfree(argbuf);

 	if (rc)
 		pr_err("Could not handle DLPAR request \"%s\"\n", buf);

 	return rc ? rc : count;
 }

 static ssize_t dlpar_show(struct class *class, struct class_attribute *attr,
 			  char *buf)
 {
 	return sprintf(buf, "%s\n", "memory,cpu");
 }

 static CLASS_ATTR_RW(dlpar);

 int __init dlpar_workqueue_init(void)
 {
 	if (pseries_hp_wq)
 		return 0;

 	pseries_hp_wq = alloc_workqueue("pseries hotplug workqueue",
 			WQ_UNBOUND, 1);

 	return pseries_hp_wq ? 0 : -ENOMEM;
 }

 static int __init dlpar_sysfs_init(void)
 {
 	int rc;

 	rc = dlpar_workqueue_init();
 	if (rc)
 		return rc;

 	return sysfs_create_file(kernel_kobj, &class_attr_dlpar.attr);
 }
 machine_device_initcall(pseries, dlpar_sysfs_init);
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* 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
	*/

	#define pr_fmt(fmt) "dlpar: " fmt

	#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 "of_helpers.h"
	#include "pseries.h"

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

	static struct workqueue_struct *pseries_hp_wq;

	struct pseries_hp_work {
	struct work_struct work;
	struct pseries_hp_errorlog *errlog;
	};

	struct cc_workarea {
	__be32 drc_index;
	__be32 zero;
	__be32 name_offset;
	__be32 prop_length;
	__be32 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 + be32_to_cpu(ccwa->name_offset);
	prop->name = kstrdup(name, GFP_KERNEL);
	if (!prop->name) {
	dlpar_free_cc_property(prop);
	return NULL;
	}

	prop->length = be32_to_cpu(ccwa->prop_length);
	value = (char *)ccwa + be32_to_cpu(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;
	const char *name;

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

	name = (const char *)ccwa + be32_to_cpu(ccwa->name_offset);
	dn->full_name = kstrdup(name, GFP_KERNEL);
	if (!dn->full_name) {
	kfree(dn);
	return NULL;
	}

	of_node_set_flag(dn, OF_DYNAMIC);
	of_node_init(dn);

	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 ERR_CFG_USE -9003

	struct device_node *dlpar_configure_connector(__be32 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;
	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);

	if (rtas_busy_delay(rc))
	continue;

	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) {
	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;
	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;
	}

	int dlpar_attach_node(struct device_node dn, struct device_node parent)
	{
	int rc;

	dn->parent = parent;

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

	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);

	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_get_sensor(DR_ENTITY_SENSE, drc_index, &dr_status);
	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_get_sensor(DR_ENTITY_SENSE, drc_index, &dr_status);
	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;
	}

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

	rc = rtas_get_sensor(DR_ENTITY_SENSE, drc_index, &dr_status);
	if (rc \|\| dr_status != DR_ENTITY_PRESENT)
	return -1;

	rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);

	return 0;
	}

	int handle_dlpar_errorlog(struct pseries_hp_errorlog *hp_elog)
	{
	int rc;

	/* pseries error logs are in BE format, convert to cpu type */
	switch (hp_elog->id_type) {
	case PSERIES_HP_ELOG_ID_DRC_COUNT:
	hp_elog->_drc_u.drc_count =
	be32_to_cpu(hp_elog->_drc_u.drc_count);
	break;
	case PSERIES_HP_ELOG_ID_DRC_INDEX:
	hp_elog->_drc_u.drc_index =
	be32_to_cpu(hp_elog->_drc_u.drc_index);
	break;
	case PSERIES_HP_ELOG_ID_DRC_IC:
	hp_elog->_drc_u.ic.count =
	be32_to_cpu(hp_elog->_drc_u.ic.count);
	hp_elog->_drc_u.ic.index =
	be32_to_cpu(hp_elog->_drc_u.ic.index);
	}

	switch (hp_elog->resource) {
	case PSERIES_HP_ELOG_RESOURCE_MEM:
	rc = dlpar_memory(hp_elog);
	break;
	case PSERIES_HP_ELOG_RESOURCE_CPU:
	rc = dlpar_cpu(hp_elog);
	break;
	case PSERIES_HP_ELOG_RESOURCE_PMEM:
	rc = dlpar_hp_pmem(hp_elog);
	break;

	default:
	pr_warn_ratelimited("Invalid resource (%d) specified\n",
	hp_elog->resource);
	rc = -EINVAL;
	}

	return rc;
	}

	static void pseries_hp_work_fn(struct work_struct *work)
	{
	struct pseries_hp_work *hp_work =
	container_of(work, struct pseries_hp_work, work);

	handle_dlpar_errorlog(hp_work->errlog);

	kfree(hp_work->errlog);
	kfree((void *)work);
	}

	void queue_hotplug_event(struct pseries_hp_errorlog *hp_errlog)
	{
	struct pseries_hp_work *work;
	struct pseries_hp_errorlog *hp_errlog_copy;

	hp_errlog_copy = kmemdup(hp_errlog, sizeof(*hp_errlog), GFP_ATOMIC);
	if (!hp_errlog_copy)
	return;

	work = kmalloc(sizeof(struct pseries_hp_work), GFP_ATOMIC);
	if (work) {
	INIT_WORK((struct work_struct *)work, pseries_hp_work_fn);
	work->errlog = hp_errlog_copy;
	queue_work(pseries_hp_wq, (struct work_struct *)work);
	} else {
	kfree(hp_errlog_copy);
	}
	}

	static int dlpar_parse_resource(char *cmd, struct pseries_hp_errorlog hp_elog)
	{
	char *arg;

	arg = strsep(cmd, " ");
	if (!arg)
	return -EINVAL;

	if (sysfs_streq(arg, "memory")) {
	hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_MEM;
	} else if (sysfs_streq(arg, "cpu")) {
	hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_CPU;
	} else {
	pr_err("Invalid resource specified.\n");
	return -EINVAL;
	}

	return 0;
	}

	static int dlpar_parse_action(char *cmd, struct pseries_hp_errorlog hp_elog)
	{
	char *arg;

	arg = strsep(cmd, " ");
	if (!arg)
	return -EINVAL;

	if (sysfs_streq(arg, "add")) {
	hp_elog->action = PSERIES_HP_ELOG_ACTION_ADD;
	} else if (sysfs_streq(arg, "remove")) {
	hp_elog->action = PSERIES_HP_ELOG_ACTION_REMOVE;
	} else {
	pr_err("Invalid action specified.\n");
	return -EINVAL;
	}

	return 0;
	}

	static int dlpar_parse_id_type(char *cmd, struct pseries_hp_errorlog hp_elog)
	{
	char *arg;
	u32 count, index;

	arg = strsep(cmd, " ");
	if (!arg)
	return -EINVAL;

	if (sysfs_streq(arg, "indexed-count")) {
	hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_IC;
	arg = strsep(cmd, " ");
	if (!arg) {
	pr_err("No DRC count specified.\n");
	return -EINVAL;
	}

	if (kstrtou32(arg, 0, &count)) {
	pr_err("Invalid DRC count specified.\n");
	return -EINVAL;
	}

	arg = strsep(cmd, " ");
	if (!arg) {
	pr_err("No DRC Index specified.\n");
	return -EINVAL;
	}

	if (kstrtou32(arg, 0, &index)) {
	pr_err("Invalid DRC Index specified.\n");
	return -EINVAL;
	}

	hp_elog->_drc_u.ic.count = cpu_to_be32(count);
	hp_elog->_drc_u.ic.index = cpu_to_be32(index);
	} else if (sysfs_streq(arg, "index")) {
	hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_INDEX;
	arg = strsep(cmd, " ");
	if (!arg) {
	pr_err("No DRC Index specified.\n");
	return -EINVAL;
	}

	if (kstrtou32(arg, 0, &index)) {
	pr_err("Invalid DRC Index specified.\n");
	return -EINVAL;
	}

	hp_elog->_drc_u.drc_index = cpu_to_be32(index);
	} else if (sysfs_streq(arg, "count")) {
	hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_COUNT;
	arg = strsep(cmd, " ");
	if (!arg) {
	pr_err("No DRC count specified.\n");
	return -EINVAL;
	}

	if (kstrtou32(arg, 0, &count)) {
	pr_err("Invalid DRC count specified.\n");
	return -EINVAL;
	}

	hp_elog->_drc_u.drc_count = cpu_to_be32(count);
	} else {
	pr_err("Invalid id_type specified.\n");
	return -EINVAL;
	}

	return 0;
	}

	static ssize_t dlpar_store(struct class class, struct class_attribute attr,
	const char *buf, size_t count)
	{
	struct pseries_hp_errorlog hp_elog;
	char *argbuf;
	char *args;
	int rc;

	args = argbuf = kstrdup(buf, GFP_KERNEL);
	if (!argbuf)
	return -ENOMEM;

	/*
	* Parse out the request from the user, this will be in the form:
	* <resource> <action> <id_type> <id>
	*/
	rc = dlpar_parse_resource(&args, &hp_elog);
	if (rc)
	goto dlpar_store_out;

	rc = dlpar_parse_action(&args, &hp_elog);
	if (rc)
	goto dlpar_store_out;

	rc = dlpar_parse_id_type(&args, &hp_elog);
	if (rc)
	goto dlpar_store_out;

	rc = handle_dlpar_errorlog(&hp_elog);

	dlpar_store_out:
	kfree(argbuf);

	if (rc)
	pr_err("Could not handle DLPAR request \"%s\"\n", buf);

	return rc ? rc : count;
	}

	static ssize_t dlpar_show(struct class class, struct class_attribute attr,
	char *buf)
	{
	return sprintf(buf, "%s\n", "memory,cpu");
	}

	static CLASS_ATTR_RW(dlpar);

	int __init dlpar_workqueue_init(void)
	{
	if (pseries_hp_wq)
	return 0;

	pseries_hp_wq = alloc_workqueue("pseries hotplug workqueue",
	WQ_UNBOUND, 1);

	return pseries_hp_wq ? 0 : -ENOMEM;
	}

	static int __init dlpar_sysfs_init(void)
	{
	int rc;

	rc = dlpar_workqueue_init();
	if (rc)
	return rc;

	return sysfs_create_file(kernel_kobj, &class_attr_dlpar.attr);
	}
	machine_device_initcall(pseries, dlpar_sysfs_init);