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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: Robert Jennings <rcj@linux.vnet.ibm.com>
Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Kent Yoder 2012-04-12 05:04:11 +00:00 committed by Benjamin Herrenschmidt
parent 4d6e0fa1a5
commit 4726b7b5e5
2 changed files with 19 additions and 0 deletions
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12
arch/powerpc/include/asm/pSeries_reconfig.h
View File

@ -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 *);

7
arch/powerpc/platforms/pseries/reconfig.c
View File

@ -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;