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Commit 4726b7b5 authored by Kent Yoder's avatar Kent Yoder Committed by Benjamin Herrenschmidt
Browse files

powerpc/pseries: Add pseries update notifier for OFDT prop changes 



This adds an update notifier mechanism for changes to properties in the
device tree.  One use of this would be a device driver that needs to act
on changes to it's properties in the device tree after a live migration
or a dynamic activation that is triggered by updates to ofdt properties.

Signed-off-by: default avatarRobert Jennings <rcj@linux.vnet.ibm.com>
Signed-off-by: default avatarKent Yoder <key@linux.vnet.ibm.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 4d6e0fa1

arch/powerpc/include/asm/pSeries_reconfig.h

+12 −0
Original line number Diff line number Diff line
@@ -13,6 +13,18 @@ 
#define PSERIES_RECONFIG_REMOVE		0x0002

#define PSERIES_DRCONF_MEM_ADD		0x0003

#define PSERIES_DRCONF_MEM_REMOVE	0x0004

#define PSERIES_UPDATE_PROPERTY		0x0005



/**

 * pSeries_reconfig_notify - Notifier value structure for OFDT property updates

 *

 * @node: Device tree node which owns the property being updated

 * @property: Updated property

 */

struct pSeries_reconfig_prop_update {

	struct device_node *node;

	struct property *property;

};



#ifdef CONFIG_PPC_PSERIES

extern int pSeries_reconfig_notifier_register(struct notifier_block *);

arch/powerpc/platforms/pseries/reconfig.c

+7 −0
Original line number Diff line number Diff line
@@ -103,11 +103,13 @@ int pSeries_reconfig_notifier_register(struct notifier_block *nb) 
{

	return blocking_notifier_chain_register(&pSeries_reconfig_chain, nb);

}

EXPORT_SYMBOL_GPL(pSeries_reconfig_notifier_register);



void pSeries_reconfig_notifier_unregister(struct notifier_block *nb)

{

	blocking_notifier_chain_unregister(&pSeries_reconfig_chain, nb);

}

EXPORT_SYMBOL_GPL(pSeries_reconfig_notifier_unregister);



int pSeries_reconfig_notify(unsigned long action, void *p)

{
@@ -426,6 +428,7 @@ static int do_remove_property(char *buf, size_t bufsize) 
static int do_update_property(char *buf, size_t bufsize)

{

	struct device_node *np;

	struct pSeries_reconfig_prop_update upd_value;

	unsigned char *value;

	char *name, *end, *next_prop;

	int rc, length;
@@ -454,6 +457,10 @@ static int do_update_property(char *buf, size_t bufsize) 
		return -ENODEV;

	}



	upd_value.node = np;

	upd_value.property = newprop;

	pSeries_reconfig_notify(PSERIES_UPDATE_PROPERTY, &upd_value);



	rc = prom_update_property(np, newprop, oldprop);

	if (rc)

		return rc;