From: Kent Yoder Subject: [PATCH v2 02/17] powerpc: Add pseries update notifier for OFDT prop changes Date: Tue, 10 Apr 2012 10:08:20 -0500 Message-ID: <1334070500.16827.5.camel@key-ThinkPad-W510> References: <1334070249.16827.1.camel@key-ThinkPad-W510> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: key@linux.vnet.ibm.com, rcj@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org, linux-crypto@vger.kernel.org To: linux-kernel@vger.kernel.org Return-path: In-Reply-To: <1334070249.16827.1.camel@key-ThinkPad-W510> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+glppe-linuxppc-embedded-2=m.gmane.org@lists.ozlabs.org Sender: linuxppc-dev-bounces+glppe-linuxppc-embedded-2=m.gmane.org@lists.ozlabs.org List-Id: linux-crypto.vger.kernel.org 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 Signed-off-by: Kent Yoder --- arch/powerpc/include/asm/pSeries_reconfig.h | 12 ++++++++++++ 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 23cd6cc..c07edfe 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 168651a..7b3bf76 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; -- 1.7.1