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| author | Kent Yoder <key@linux.vnet.ibm.com> | 2012-04-12 09:04:11 +0400 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-05-14 04:49:06 +0400 |
| commit | 4726b7b5e5a0a3d11a3c80ae8e2d5395003c51af (patch) | |
| tree | 37f5236d2ebf5b3598836bae69245358a6905961 /arch | |
| parent | 4d6e0fa1a593b2d7c4b468cb5ac52c29fe20e716 (diff) | |
| download | linux-4726b7b5e5a0a3d11a3c80ae8e2d5395003c51af.tar.xz | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/include/asm/pSeries_reconfig.h | 12 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/reconfig.c | 7 |
2 files changed, 19 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/pSeries_reconfig.h b/arch/powerpc/include/asm/pSeries_reconfig.h index 23cd6cc30bcf..c07edfe98b98 100644 --- a/arch/powerpc/include/asm/pSeries_reconfig.h +++ b/arch/powerpc/include/asm/pSeries_reconfig.h @@ -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 *); diff --git a/arch/powerpc/platforms/pseries/reconfig.c b/arch/powerpc/platforms/pseries/reconfig.c index 168651acdd83..7b3bf76ef834 100644 --- a/arch/powerpc/platforms/pseries/reconfig.c +++ b/arch/powerpc/platforms/pseries/reconfig.c @@ -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; |