From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 6EE9F3D47A5; Fri, 3 Jul 2026 12:36:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783082207; cv=none; b=Nn/hBg0F6Et3T0SxnTDTDtVmwj1sC48S1Fv/dhpY59efdaWylzAzK7ucY8pMeUP9+LWH+oqvegcv5Sw+EQrLKsNtodEY40exOhKbjnu0TTYp2Za1Ze8qY5ZAVym7nQuzMbZxl9RfqeiU/ICderkluTtowIElMptoamvNK29GUQk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783082207; c=relaxed/simple; bh=jjveyc0qSN1bLmj+1TZT8pAtwQYupmEnAO0nI9+gEa8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WPhx8qSC7q5xYx0N0RAnF7kVu8wa9H1Tk73PTn7o6t1oJAOnXvljT9k9wMVXh3qeCbjmHY2QQZKAPNbdTv5EAd8MnjEPUj1jtw92s4pxDYXY+xPnrbYjPw0UihipKTO/AHyWiaCqM+kUOMNBNwdvVvgSk0VISNI1+WiOlPmCmwQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=afU4e5Ux; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="afU4e5Ux" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 268524647; Fri, 3 Jul 2026 05:36:40 -0700 (PDT) Received: from pluto.fritz.box (usa-sjc-mx-foss1.foss.arm.com [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id E30E63F905; Fri, 3 Jul 2026 05:36:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1783082204; bh=jjveyc0qSN1bLmj+1TZT8pAtwQYupmEnAO0nI9+gEa8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=afU4e5UxS0bTq77XQEGBnnNEvOhVUo0O5BuT6ncc6yK89ryQgiyk40jV/xHgp9/S3 UZMyqIQJft1YM3svBQ1qHNXa317oIgY6eskidbf7IrdOYg3m3psCXO925SUCwtYnV+ cZvx9A4q2kHreViqaTI7gxV7JGV3ETWatFyCFUDo= From: Cristian Marussi To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, arm-scmi@vger.kernel.org, linux-doc@vger.kernel.org Cc: sudeep.holla@kernel.org, james.quinlan@broadcom.com, f.fainelli@gmail.com, vincent.guittot@linaro.org, etienne.carriere@st.com, peng.fan@oss.nxp.com, michal.simek@amd.com, d-gole@ti.com, jic23@kernel.org, elif.topuz@arm.com, lukasz.luba@arm.com, philip.radford@arm.com, brauner@kernel.org, david@kernel.org, souvik.chakravarty@arm.com, leitao@kernel.org, kas@kernel.org, puranjay@kernel.org, usama.arif@linux.dev, kernel-team@meta.com, Cristian Marussi Subject: [PATCH v5 04/23] firmware: arm_scmi: Allow protocols to register for notifications Date: Fri, 3 Jul 2026 13:35:42 +0100 Message-ID: <20260703123601.381275-5-cristian.marussi@arm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260703123601.381275-1-cristian.marussi@arm.com> References: <20260703123601.381275-1-cristian.marussi@arm.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Allow protocols themselves to register for their own notifications and provide their own notifier callbacks. Signed-off-by: Cristian Marussi --- v2-->v3 - split out unrelated changes on event sizing v1-->v2 - Fixed multiline comment format --- drivers/firmware/arm_scmi/common.h | 4 ++++ drivers/firmware/arm_scmi/driver.c | 12 ++++++++++++ drivers/firmware/arm_scmi/notify.c | 6 +++--- drivers/firmware/arm_scmi/protocols.h | 6 ++++++ 4 files changed, 25 insertions(+), 3 deletions(-) diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h index 767f08be416c..b9cd542302fb 100644 --- a/drivers/firmware/arm_scmi/common.h +++ b/drivers/firmware/arm_scmi/common.h @@ -18,6 +18,7 @@ #include #include #include +#include #include #include #include @@ -711,5 +712,8 @@ static struct platform_driver __drv = { \ void scmi_notification_instance_data_set(const struct scmi_handle *handle, void *priv); void *scmi_notification_instance_data_get(const struct scmi_handle *handle); +int scmi_notifier_register(const struct scmi_handle *handle, u8 proto_id, + u8 evt_id, const u32 *src_id, + struct notifier_block *nb); int scmi_inflight_count(const struct scmi_handle *handle); #endif /* _SCMI_COMMON_H */ diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c index b616b73df957..4d4bd2d4a858 100644 --- a/drivers/firmware/arm_scmi/driver.c +++ b/drivers/firmware/arm_scmi/driver.c @@ -1657,6 +1657,17 @@ static void *scmi_get_protocol_priv(const struct scmi_protocol_handle *ph) return pi->priv; } +static int +scmi_register_instance_notifier(const struct scmi_protocol_handle *ph, + u8 evt_id, const u32 *src_id, + struct notifier_block *nb) +{ + const struct scmi_protocol_instance *pi = ph_to_pi(ph); + + return scmi_notifier_register(pi->handle, pi->proto->id, + evt_id, src_id, nb); +} + static const struct scmi_xfer_ops xfer_ops = { .xfer_get_init = xfer_get_init, .reset_rx_to_maxsz = reset_rx_to_maxsz, @@ -2256,6 +2267,7 @@ scmi_alloc_init_protocol_instance(struct scmi_info *info, pi->ph.hops = &helpers_ops; pi->ph.set_priv = scmi_set_protocol_priv; pi->ph.get_priv = scmi_get_protocol_priv; + pi->ph.notifier_register = scmi_register_instance_notifier; refcount_set(&pi->users, 1); /* diff --git a/drivers/firmware/arm_scmi/notify.c b/drivers/firmware/arm_scmi/notify.c index 3e4c97ab7b61..2a8efdf0bab8 100644 --- a/drivers/firmware/arm_scmi/notify.c +++ b/drivers/firmware/arm_scmi/notify.c @@ -1389,9 +1389,9 @@ static int scmi_event_handler_enable_events(struct scmi_event_handler *hndl) * * Return: 0 on Success */ -static int scmi_notifier_register(const struct scmi_handle *handle, - u8 proto_id, u8 evt_id, const u32 *src_id, - struct notifier_block *nb) +int scmi_notifier_register(const struct scmi_handle *handle, + u8 proto_id, u8 evt_id, const u32 *src_id, + struct notifier_block *nb) { int ret = 0; u32 evt_key; diff --git a/drivers/firmware/arm_scmi/protocols.h b/drivers/firmware/arm_scmi/protocols.h index 15ad5162e37a..898d80c50f75 100644 --- a/drivers/firmware/arm_scmi/protocols.h +++ b/drivers/firmware/arm_scmi/protocols.h @@ -166,6 +166,9 @@ struct scmi_proto_helpers_ops; * can be used by the protocol implementation to generate SCMI messages. * @set_priv: A method to set protocol private data for this instance. * @get_priv: A method to get protocol private data previously set. + * @notifier_register: A method to register interest for notifications from + * within a protocol implementation unit: notifiers can + * be registered only for the same protocol. * * This structure represents a protocol initialized against specific SCMI * instance and it will be used as follows: @@ -185,6 +188,9 @@ struct scmi_protocol_handle { const struct scmi_proto_helpers_ops *hops; int (*set_priv)(const struct scmi_protocol_handle *ph, void *priv); void *(*get_priv)(const struct scmi_protocol_handle *ph); + int (*notifier_register)(const struct scmi_protocol_handle *ph, + u8 evt_id, const u32 *src_id, + struct notifier_block *nb); }; /** -- 2.54.0