From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C7E703F1AD9; Wed, 20 May 2026 17:54:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779299644; cv=none; b=ozSFYNpVLvKX0VLjtmd4S6UdGZKztC/OKmuc5g9sHdkkbdRGyBVKLzqYPuozBmfG0FK3xQF4TZO5x3+04mDLyvuKUiBaeEMITK3XFo/YcAAE+hr4wU2jLkCFq0WFGUI8srZMopuGd3gdyBHsYxKOiil6zz1wNmLeTBB1bZSbuY4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779299644; c=relaxed/simple; bh=qLGdWKz3Sh2u2lVBuffJUOFF5yZXXVXIsMDtkR+EGus=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HlBEIKtzIX3giEpJ6P5eC+my7552huQVt/O8jcvgvCdudM6ou8AKFg4jZXV1VYHKUgLT5nSrRRGs1tYZxW9VMq3itBk8MbrtVCUHXtZRmdc8knVmvxhPt7wKV5oj3DOpmrh07CVMVYbbNHyY2r19M/GYfnt+jGkR02IUT9R4Uhc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=os2zPlP3; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="os2zPlP3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3FE951F000E9; Wed, 20 May 2026 17:54:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1779299642; bh=8DntM4s7/rVXPbeXj1Vh6fASVK3Wm/2Ajzt4EB0d1AA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=os2zPlP3F799JXso1kIbiKjsKOmP3jj0F1s6mcWc1kP5jqOtXbzEOg6HMk/8RVGqj GGFlElOLSLHziJqqeCjZZQ0DEIMh28bgeSnsVh8MGkghEPGYTzldNJr5xINzCMVJJv KwWkadGZn2YO54kWdQ860dTmFIKg5uR/RkDC2eQo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Vadim Fedorenko , Ivan Vecera , Petr Oros , Arkadiusz Kubalewski , Aleksandr Loktionov , Paolo Abeni , Sasha Levin Subject: [PATCH 6.18 851/957] dpll: Add notifier chain for dpll events Date: Wed, 20 May 2026 18:22:14 +0200 Message-ID: <20260520162153.022109370@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260520162134.554764788@linuxfoundation.org> References: <20260520162134.554764788@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Petr Oros [ Upstream commit 2be467588d6bc6ec5988fc254e62a44b865912a0 ] Currently, the DPLL subsystem reports events (creation, deletion, changes) to userspace via Netlink. However, there is no mechanism for other kernel components to be notified of these events directly. Add a raw notifier chain to the DPLL core protected by dpll_lock. This allows other kernel subsystems or drivers to register callbacks and receive notifications when DPLL devices or pins are created, deleted, or modified. Define the following: - Registration helpers: {,un}register_dpll_notifier() - Event types: DPLL_DEVICE_CREATED, DPLL_PIN_CREATED, etc. - Context structures: dpll_{device,pin}_notifier_info to pass relevant data to the listeners. The notification chain is invoked alongside the existing Netlink event generation to ensure in-kernel listeners are kept in sync with the subsystem state. Reviewed-by: Vadim Fedorenko Co-developed-by: Ivan Vecera Signed-off-by: Ivan Vecera Signed-off-by: Petr Oros Reviewed-by: Arkadiusz Kubalewski Reviewed-by: Aleksandr Loktionov Link: https://patch.msgid.link/20260203174002.705176-4-ivecera@redhat.com Signed-off-by: Paolo Abeni Stable-dep-of: 9e5dead140af ("ice: add dpll peer notification for paired SMA and U.FL pins") Signed-off-by: Sasha Levin --- drivers/dpll/dpll_core.c | 57 +++++++++++++++++++++++++++++++++++++ drivers/dpll/dpll_core.h | 4 +++ drivers/dpll/dpll_netlink.c | 6 ++++ include/linux/dpll.h | 29 +++++++++++++++++++ 4 files changed, 96 insertions(+) diff --git a/drivers/dpll/dpll_core.c b/drivers/dpll/dpll_core.c index f04ed7195cadd..b05fe2ba46d91 100644 --- a/drivers/dpll/dpll_core.c +++ b/drivers/dpll/dpll_core.c @@ -23,6 +23,8 @@ DEFINE_MUTEX(dpll_lock); DEFINE_XARRAY_FLAGS(dpll_device_xa, XA_FLAGS_ALLOC); DEFINE_XARRAY_FLAGS(dpll_pin_xa, XA_FLAGS_ALLOC); +static RAW_NOTIFIER_HEAD(dpll_notifier_chain); + static u32 dpll_device_xa_id; static u32 dpll_pin_xa_id; @@ -46,6 +48,39 @@ struct dpll_pin_registration { void *cookie; }; +static int call_dpll_notifiers(unsigned long action, void *info) +{ + lockdep_assert_held(&dpll_lock); + return raw_notifier_call_chain(&dpll_notifier_chain, action, info); +} + +void dpll_device_notify(struct dpll_device *dpll, unsigned long action) +{ + struct dpll_device_notifier_info info = { + .dpll = dpll, + .id = dpll->id, + .idx = dpll->device_idx, + .clock_id = dpll->clock_id, + .type = dpll->type, + }; + + call_dpll_notifiers(action, &info); +} + +void dpll_pin_notify(struct dpll_pin *pin, unsigned long action) +{ + struct dpll_pin_notifier_info info = { + .pin = pin, + .id = pin->id, + .idx = pin->pin_idx, + .clock_id = pin->clock_id, + .fwnode = pin->fwnode, + .prop = &pin->prop, + }; + + call_dpll_notifiers(action, &info); +} + struct dpll_device *dpll_device_get_by_id(int id) { if (xa_get_mark(&dpll_device_xa, id, DPLL_REGISTERED)) @@ -539,6 +574,28 @@ void dpll_netdev_pin_clear(struct net_device *dev) } EXPORT_SYMBOL(dpll_netdev_pin_clear); +int register_dpll_notifier(struct notifier_block *nb) +{ + int ret; + + mutex_lock(&dpll_lock); + ret = raw_notifier_chain_register(&dpll_notifier_chain, nb); + mutex_unlock(&dpll_lock); + return ret; +} +EXPORT_SYMBOL_GPL(register_dpll_notifier); + +int unregister_dpll_notifier(struct notifier_block *nb) +{ + int ret; + + mutex_lock(&dpll_lock); + ret = raw_notifier_chain_unregister(&dpll_notifier_chain, nb); + mutex_unlock(&dpll_lock); + return ret; +} +EXPORT_SYMBOL_GPL(unregister_dpll_notifier); + /** * dpll_pin_get - find existing or create new dpll pin * @clock_id: clock_id of creator diff --git a/drivers/dpll/dpll_core.h b/drivers/dpll/dpll_core.h index d3e17ff0ecef0..b7b4bb251f739 100644 --- a/drivers/dpll/dpll_core.h +++ b/drivers/dpll/dpll_core.h @@ -91,4 +91,8 @@ struct dpll_pin_ref *dpll_xa_ref_dpll_first(struct xarray *xa_refs); extern struct xarray dpll_device_xa; extern struct xarray dpll_pin_xa; extern struct mutex dpll_lock; + +void dpll_device_notify(struct dpll_device *dpll, unsigned long action); +void dpll_pin_notify(struct dpll_pin *pin, unsigned long action); + #endif diff --git a/drivers/dpll/dpll_netlink.c b/drivers/dpll/dpll_netlink.c index 64944f601ee5a..fe9c3d9073f0f 100644 --- a/drivers/dpll/dpll_netlink.c +++ b/drivers/dpll/dpll_netlink.c @@ -742,17 +742,20 @@ dpll_device_event_send(enum dpll_cmd event, struct dpll_device *dpll) int dpll_device_create_ntf(struct dpll_device *dpll) { + dpll_device_notify(dpll, DPLL_DEVICE_CREATED); return dpll_device_event_send(DPLL_CMD_DEVICE_CREATE_NTF, dpll); } int dpll_device_delete_ntf(struct dpll_device *dpll) { + dpll_device_notify(dpll, DPLL_DEVICE_DELETED); return dpll_device_event_send(DPLL_CMD_DEVICE_DELETE_NTF, dpll); } static int __dpll_device_change_ntf(struct dpll_device *dpll) { + dpll_device_notify(dpll, DPLL_DEVICE_CHANGED); return dpll_device_event_send(DPLL_CMD_DEVICE_CHANGE_NTF, dpll); } @@ -810,16 +813,19 @@ dpll_pin_event_send(enum dpll_cmd event, struct dpll_pin *pin) int dpll_pin_create_ntf(struct dpll_pin *pin) { + dpll_pin_notify(pin, DPLL_PIN_CREATED); return dpll_pin_event_send(DPLL_CMD_PIN_CREATE_NTF, pin); } int dpll_pin_delete_ntf(struct dpll_pin *pin) { + dpll_pin_notify(pin, DPLL_PIN_DELETED); return dpll_pin_event_send(DPLL_CMD_PIN_DELETE_NTF, pin); } int __dpll_pin_change_ntf(struct dpll_pin *pin) { + dpll_pin_notify(pin, DPLL_PIN_CHANGED); return dpll_pin_event_send(DPLL_CMD_PIN_CHANGE_NTF, pin); } diff --git a/include/linux/dpll.h b/include/linux/dpll.h index f0c31a111c304..34b005bb4df6f 100644 --- a/include/linux/dpll.h +++ b/include/linux/dpll.h @@ -11,6 +11,7 @@ #include #include #include +#include #include struct dpll_device; @@ -167,6 +168,30 @@ struct dpll_pin_properties { u32 phase_gran; }; +#define DPLL_DEVICE_CREATED 1 +#define DPLL_DEVICE_DELETED 2 +#define DPLL_DEVICE_CHANGED 3 +#define DPLL_PIN_CREATED 4 +#define DPLL_PIN_DELETED 5 +#define DPLL_PIN_CHANGED 6 + +struct dpll_device_notifier_info { + struct dpll_device *dpll; + u32 id; + u32 idx; + u64 clock_id; + enum dpll_type type; +}; + +struct dpll_pin_notifier_info { + struct dpll_pin *pin; + u32 id; + u32 idx; + u64 clock_id; + const struct fwnode_handle *fwnode; + const struct dpll_pin_properties *prop; +}; + #if IS_ENABLED(CONFIG_DPLL) void dpll_netdev_pin_set(struct net_device *dev, struct dpll_pin *dpll_pin); void dpll_netdev_pin_clear(struct net_device *dev); @@ -237,4 +262,8 @@ int dpll_device_change_ntf(struct dpll_device *dpll); int dpll_pin_change_ntf(struct dpll_pin *pin); +int register_dpll_notifier(struct notifier_block *nb); + +int unregister_dpll_notifier(struct notifier_block *nb); + #endif -- 2.53.0