Patchwork [1/3] Kernel DLPAR infrastructure

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Submitter Nathan Fontenot
Date Nov. 25, 2009, 1:48 a.m.
Message ID <4B0C8CE3.4010207@austin.ibm.com>
Download mbox | patch
Permalink /patch/39269/
State Superseded
Headers show

Comments

Nathan Fontenot - Nov. 25, 2009, 1:48 a.m.
This patch provides the kernel DLPAR infrastructure in a new filed named
dlpar.c.  The functionality provided is for acquiring and releasing a resource
from firmware and the parsing of information returned from the
ibm,configure-connector rtas call.  Additionally this exports the pSeries
reconfiguration notifier chain so that it can be invoked when device tree 
updates are made.

Signed-off-by: Nathan Fontenot <nfont@austin.ibm.com> 
---

---
 arch/powerpc/include/asm/pSeries_reconfig.h |    1 
 arch/powerpc/platforms/pseries/Makefile     |    2 
 arch/powerpc/platforms/pseries/dlpar.c      |  324 ++++++++++++++++++++++++++++
 arch/powerpc/platforms/pseries/reconfig.c   |    2 
 4 files changed, 327 insertions(+), 2 deletions(-)
Michael Neuling - Nov. 25, 2009, 2:15 a.m.
In message <4B0C8CE3.4010207@austin.ibm.com> you wrote:
> This patch provides the kernel DLPAR infrastructure in a new filed named
> dlpar.c.  The functionality provided is for acquiring and releasing a resourc
e
> from firmware and the parsing of information returned from the
> ibm,configure-connector rtas call.  Additionally this exports the pSeries
> reconfiguration notifier chain so that it can be invoked when device tree 
> updates are made.
> 
> Signed-off-by: Nathan Fontenot <nfont@austin.ibm.com> 

These look like they got white space munged somewhere...

Mikey

> ---
> 
> ---
>  arch/powerpc/include/asm/pSeries_reconfig.h |    1 
>  arch/powerpc/platforms/pseries/Makefile     |    2 
>  arch/powerpc/platforms/pseries/dlpar.c      |  324 +++++++++++++++++++++++++
+++
>  arch/powerpc/platforms/pseries/reconfig.c   |    2 
>  4 files changed, 327 insertions(+), 2 deletions(-)
> 
> Index: powerpc/arch/powerpc/platforms/pseries/dlpar.c
> ===================================================================
> --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> +++ powerpc/arch/powerpc/platforms/pseries/dlpar.c	2009-11-24 23:31:28.000
000000 -0600
> @@ -0,0 +1,324 @@
> +/*
> + * 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 <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;
> +
> +	name = (char *)ccwa + ccwa->name_offset;
> +	dn->full_name = kstrdup(name, GFP_KERNEL);
> +
> +	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 parent_path[128];
> +	int parent_path_len;
> +
> +	parent_path_len = strrchr(path, '/') - path + 1;
> +	strlcpy(parent_path, path, parent_path_len);
> +
> +	parent = of_find_node_by_path(parent_path);
> +
> +	return parent;
> +}
> +
> +int dlpar_attach_node(struct device_node *dn)
> +{
> +	struct proc_dir_entry *ent;
> +	int rc;
> +
> +	of_node_set_flag(dn, OF_DYNAMIC);
> +	kref_init(&dn->kref);
> +	dn->parent = derive_parent(dn->full_name);
> +
> +	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)
> +{
> +	struct device_node *parent = dn->parent;
> +	struct property *prop = dn->properties;
> +
> +#ifdef CONFIG_PROC_DEVICETREE
> +	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;
> +}
> +
> +
> Index: powerpc/arch/powerpc/platforms/pseries/Makefile
> ===================================================================
> --- powerpc.orig/arch/powerpc/platforms/pseries/Makefile	2009-11-20 17:5
3:54.000000000 -0600
> +++ powerpc/arch/powerpc/platforms/pseries/Makefile	2009-11-20 17:55:52.000
000000 -0600
> @@ -8,7 +8,7 @@
>  
>  obj-y			:= lpar.o hvCall.o nvram.o reconfig.o \
>  			   setup.o iommu.o ras.o rtasd.o \
> -			   firmware.o power.o
> +			   firmware.o power.o dlpar.o
>  obj-$(CONFIG_SMP)	+= smp.o
>  obj-$(CONFIG_XICS)	+= xics.o
>  obj-$(CONFIG_SCANLOG)	+= scanlog.o
> Index: powerpc/arch/powerpc/include/asm/pSeries_reconfig.h
> ===================================================================
> --- powerpc.orig/arch/powerpc/include/asm/pSeries_reconfig.h	2009-11-20 17:5
3:54.000000000 -0600
> +++ powerpc/arch/powerpc/include/asm/pSeries_reconfig.h	2009-11-20 17:5
5:52.000000000 -0600
> @@ -17,6 +17,7 @@
>  #ifdef CONFIG_PPC_PSERIES
>  extern int pSeries_reconfig_notifier_register(struct notifier_block *);
>  extern void pSeries_reconfig_notifier_unregister(struct notifier_block *);
> +extern struct blocking_notifier_head pSeries_reconfig_chain;
>  #else /* !CONFIG_PPC_PSERIES */
>  static inline int pSeries_reconfig_notifier_register(struct notifier_block *
nb)
>  {
> Index: powerpc/arch/powerpc/platforms/pseries/reconfig.c
> ===================================================================
> --- powerpc.orig/arch/powerpc/platforms/pseries/reconfig.c	2009-11-20 17:5
3:54.000000000 -0600
> +++ powerpc/arch/powerpc/platforms/pseries/reconfig.c	2009-11-20 17:55:52.000
000000 -0600
> @@ -96,7 +96,7 @@
>  	return parent;
>  }
>  
> -static BLOCKING_NOTIFIER_HEAD(pSeries_reconfig_chain);
> +BLOCKING_NOTIFIER_HEAD(pSeries_reconfig_chain);
>  
>  int pSeries_reconfig_notifier_register(struct notifier_block *nb)
>  {
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/linuxppc-dev
>
Michael Neuling - Nov. 25, 2009, 3:03 a.m.
In message <31581.1259115310@neuling.org> you wrote:
> 
> 
> In message <4B0C8CE3.4010207@austin.ibm.com> you wrote:
> > This patch provides the kernel DLPAR infrastructure in a new filed named
> > dlpar.c.  The functionality provided is for acquiring and releasing a resou
rc
> e
> > from firmware and the parsing of information returned from the
> > ibm,configure-connector rtas call.  Additionally this exports the pSeries
> > reconfiguration notifier chain so that it can be invoked when device tree 
> > updates are made.
> > 
> > Signed-off-by: Nathan Fontenot <nfont@austin.ibm.com> 
> 
> These look like they got white space munged somewhere...

Gah, sorry, they are fine

Mikey
Paul Mackerras - Nov. 25, 2009, 3:16 a.m.
Nathan Fontenot writes:

> This patch provides the kernel DLPAR infrastructure in a new filed named
> dlpar.c.  The functionality provided is for acquiring and releasing a resource
> from firmware and the parsing of information returned from the
> ibm,configure-connector rtas call.  Additionally this exports the pSeries
> reconfiguration notifier chain so that it can be invoked when device tree 
> updates are made.

Mostly looks great.

> +static struct device_node *derive_parent(const char *path)
> +{
> +	struct device_node *parent;
> +	char parent_path[128];
> +	int parent_path_len;
> +
> +	parent_path_len = strrchr(path, '/') - path + 1;
> +	strlcpy(parent_path, path, parent_path_len);

This looks a bit fragile if path could possibly not contain any '/' or
if the '/' is more than 128 characters from the start of path.  Please
fix this to check if strrchr returns NULL and to cope in some
reasonable fashion if the path happens to be very long.

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

Also assumes that dn->full_name contains a '/'.  If for some reason it
couldn't possibly not contain a '/', put in a comment explaining that.

Thanks,
Paul.

Patch

Index: powerpc/arch/powerpc/platforms/pseries/dlpar.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ powerpc/arch/powerpc/platforms/pseries/dlpar.c	2009-11-24 23:31:28.000000000 -0600
@@ -0,0 +1,324 @@ 
+/*
+ * 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 <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;
+
+	name = (char *)ccwa + ccwa->name_offset;
+	dn->full_name = kstrdup(name, GFP_KERNEL);
+
+	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 parent_path[128];
+	int parent_path_len;
+
+	parent_path_len = strrchr(path, '/') - path + 1;
+	strlcpy(parent_path, path, parent_path_len);
+
+	parent = of_find_node_by_path(parent_path);
+
+	return parent;
+}
+
+int dlpar_attach_node(struct device_node *dn)
+{
+	struct proc_dir_entry *ent;
+	int rc;
+
+	of_node_set_flag(dn, OF_DYNAMIC);
+	kref_init(&dn->kref);
+	dn->parent = derive_parent(dn->full_name);
+
+	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)
+{
+	struct device_node *parent = dn->parent;
+	struct property *prop = dn->properties;
+
+#ifdef CONFIG_PROC_DEVICETREE
+	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;
+}
+
+
Index: powerpc/arch/powerpc/platforms/pseries/Makefile
===================================================================
--- powerpc.orig/arch/powerpc/platforms/pseries/Makefile	2009-11-20 17:53:54.000000000 -0600
+++ powerpc/arch/powerpc/platforms/pseries/Makefile	2009-11-20 17:55:52.000000000 -0600
@@ -8,7 +8,7 @@ 
 
 obj-y			:= lpar.o hvCall.o nvram.o reconfig.o \
 			   setup.o iommu.o ras.o rtasd.o \
-			   firmware.o power.o
+			   firmware.o power.o dlpar.o
 obj-$(CONFIG_SMP)	+= smp.o
 obj-$(CONFIG_XICS)	+= xics.o
 obj-$(CONFIG_SCANLOG)	+= scanlog.o
Index: powerpc/arch/powerpc/include/asm/pSeries_reconfig.h
===================================================================
--- powerpc.orig/arch/powerpc/include/asm/pSeries_reconfig.h	2009-11-20 17:53:54.000000000 -0600
+++ powerpc/arch/powerpc/include/asm/pSeries_reconfig.h	2009-11-20 17:55:52.000000000 -0600
@@ -17,6 +17,7 @@ 
 #ifdef CONFIG_PPC_PSERIES
 extern int pSeries_reconfig_notifier_register(struct notifier_block *);
 extern void pSeries_reconfig_notifier_unregister(struct notifier_block *);
+extern struct blocking_notifier_head pSeries_reconfig_chain;
 #else /* !CONFIG_PPC_PSERIES */
 static inline int pSeries_reconfig_notifier_register(struct notifier_block *nb)
 {
Index: powerpc/arch/powerpc/platforms/pseries/reconfig.c
===================================================================
--- powerpc.orig/arch/powerpc/platforms/pseries/reconfig.c	2009-11-20 17:53:54.000000000 -0600
+++ powerpc/arch/powerpc/platforms/pseries/reconfig.c	2009-11-20 17:55:52.000000000 -0600
@@ -96,7 +96,7 @@ 
 	return parent;
 }
 
-static BLOCKING_NOTIFIER_HEAD(pSeries_reconfig_chain);
+BLOCKING_NOTIFIER_HEAD(pSeries_reconfig_chain);
 
 int pSeries_reconfig_notifier_register(struct notifier_block *nb)
 {