From patchwork Wed Dec 2 20:40:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cristian Marussi X-Patchwork-Id: 11947151 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E576FC6369E for ; Wed, 2 Dec 2020 21:00:55 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7DDEB22206 for ; Wed, 2 Dec 2020 21:00:55 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7DDEB22206 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:MIME-Version:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:References:In-Reply-To:Message-Id:Date:Subject:To: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=fD4gbDCb69he4pWW6NOWEfuzyX69y8zXal62ojvm5to=; b=SHngPUNk28EmUkV0xLqcA2QypT 6lJDjs3SCgQ77yJ/+po64h4zOr/ZuTTVXpNCJ6k984GDmTciX/O2OSuxOvJ374F974jJKk+wIJwvX c0Mcm9eGcDQXQRvZE0DUYBQnsJynOLkw74M/k4pQttitVFs2ULxMLPjWmuzN6EDTHlB0opjjMZcMl EWdQC+wqcDasaj8TURXmXVJ/hf/NtLuL/Jg4ayMERCCDkd073VmMpPOoPVJUesFvIKWkGOHjUmCPZ fzZouLOSzj+OqMAJND/5YJ1enG18AzhnhRwrjTeAWkUCtL1gPmvv63I0moBL3JboijRRjgpjEnYRT TIWrj1ow==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kkZDI-0000pz-28; Wed, 02 Dec 2020 20:59:00 +0000 Received: from foss.arm.com ([217.140.110.172]) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kkYwW-0002ka-8f for linux-arm-kernel@lists.infradead.org; Wed, 02 Dec 2020 20:41:43 +0000 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 9A8AF15EC; Wed, 2 Dec 2020 12:41:39 -0800 (PST) Received: from e120937-lin.home (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 6C53E3F575; Wed, 2 Dec 2020 12:41:37 -0800 (PST) From: Cristian Marussi To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 35/37] firmware: arm_scmi: make notify_priv really private Date: Wed, 2 Dec 2020 20:40:07 +0000 Message-Id: <20201202204009.32073-36-cristian.marussi@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201202204009.32073-1-cristian.marussi@arm.com> References: <20201202204009.32073-1-cristian.marussi@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201202_154140_920560_91F3AC17 X-CRM114-Status: GOOD ( 17.90 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: f.fainelli@gmail.com, vincent.guittot@linaro.org, sudeep.holla@arm.com, thara.gopinath@linaro.org, Cristian Marussi , james.quinlan@broadcom.com, Jonathan.Cameron@Huawei.com, souvik.chakravarty@arm.com, etienne.carriere@linaro.org, lukasz.luba@arm.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Notification private data is currently accessible via handle->notify_priv; this data was indeed meant to be private to the notification core support and not to be accessible by SCMI drivers: make it private hiding it inside instance descriptor struct scmi_info and accessible only via dedicated helpers. Signed-off-by: Cristian Marussi --- drivers/firmware/arm_scmi/common.h | 4 +++ drivers/firmware/arm_scmi/driver.c | 21 ++++++++++++++ drivers/firmware/arm_scmi/notify.c | 45 ++++++++++-------------------- include/linux/scmi_protocol.h | 3 -- 4 files changed, 40 insertions(+), 33 deletions(-) diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h index 65db0aefc489..5fb64182610a 100644 --- a/drivers/firmware/arm_scmi/common.h +++ b/drivers/firmware/arm_scmi/common.h @@ -341,4 +341,8 @@ void shmem_clear_channel(struct scmi_shared_mem __iomem *shmem); bool shmem_poll_done(struct scmi_shared_mem __iomem *shmem, struct scmi_xfer *xfer); +void scmi_set_notification_instance_data(const struct scmi_handle *handle, + void *priv); +void *scmi_get_notification_instance_data(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 77e108475aea..a0a6a3d1d239 100644 --- a/drivers/firmware/arm_scmi/driver.c +++ b/drivers/firmware/arm_scmi/driver.c @@ -113,6 +113,7 @@ struct scmi_protocol_instance { * @protocols_mtx: A mutex to protect protocols instances initialization. * @protocols_imp: List of protocols implemented, currently maximum of * MAX_PROTOCOLS_IMP elements allocated by the base protocol + * @notify_priv: Pointer to private data structure specific to notifications. * @node: List head * @users: Number of users of this instance */ @@ -129,6 +130,7 @@ struct scmi_info { /* Ensure mutual exclusive access to protocols instance array */ struct mutex protocols_mtx; u8 *protocols_imp; + void *notify_priv; struct list_head node; int users; }; @@ -170,6 +172,25 @@ static inline void scmi_dump_header_dbg(struct device *dev, hdr->id, hdr->seq, hdr->protocol_id); } +void scmi_set_notification_instance_data(const struct scmi_handle *handle, + void *priv) +{ + struct scmi_info *info = handle_to_scmi_info(handle); + + info->notify_priv = priv; + /* Ensure updated protocol private date are visible */ + smp_wmb(); +} + +void *scmi_get_notification_instance_data(const struct scmi_handle *handle) +{ + struct scmi_info *info = handle_to_scmi_info(handle); + + /* Ensure protocols_private_data has been updated */ + smp_rmb(); + return info->notify_priv; +} + /** * scmi_xfer_get() - Allocate one message * diff --git a/drivers/firmware/arm_scmi/notify.c b/drivers/firmware/arm_scmi/notify.c index d88bc9960c7c..39374255b3a7 100644 --- a/drivers/firmware/arm_scmi/notify.c +++ b/drivers/firmware/arm_scmi/notify.c @@ -582,11 +582,9 @@ int scmi_notify(const struct scmi_handle *handle, u8 proto_id, u8 evt_id, struct scmi_event_header eh; struct scmi_notify_instance *ni; - /* Ensure notify_priv is updated */ - smp_rmb(); - if (!handle->notify_priv) + ni = scmi_get_notification_instance_data(handle); + if (!ni) return 0; - ni = handle->notify_priv; r_evt = SCMI_GET_REVT(ni, proto_id, evt_id); if (!r_evt) @@ -762,11 +760,9 @@ int scmi_register_protocol_events(const struct scmi_handle *handle, u8 proto_id, (!ee->num_sources && !ee->ops->get_num_sources)) return -EINVAL; - /* Ensure notify_priv is updated */ - smp_rmb(); - if (!handle->notify_priv) + ni = scmi_get_notification_instance_data(handle); + if (!ni) return -ENOMEM; - ni = handle->notify_priv; /* num_sources cannot be <= 0 */ if (ee->num_sources) { @@ -851,12 +847,10 @@ void scmi_deregister_protocol_events(const struct scmi_handle *handle, struct scmi_notify_instance *ni; struct scmi_registered_events_desc *pd; - /* Ensure notify_priv is updated */ - smp_rmb(); - if (!handle->notify_priv) + ni = scmi_get_notification_instance_data(handle); + if (!ni) return; - ni = handle->notify_priv; pd = ni->registered_protocols[proto_id]; if (!pd) return; @@ -1359,11 +1353,9 @@ static int scmi_register_notifier(const struct scmi_handle *handle, struct scmi_event_handler *hndl; struct scmi_notify_instance *ni; - /* Ensure notify_priv is updated */ - smp_rmb(); - if (!handle->notify_priv) + ni = scmi_get_notification_instance_data(handle); + if (!ni) return -ENODEV; - ni = handle->notify_priv; evt_key = MAKE_HASH_KEY(proto_id, evt_id, src_id ? *src_id : SRC_ID_MASK); @@ -1407,11 +1399,9 @@ static int scmi_unregister_notifier(const struct scmi_handle *handle, struct scmi_event_handler *hndl; struct scmi_notify_instance *ni; - /* Ensure notify_priv is updated */ - smp_rmb(); - if (!handle->notify_priv) + ni = scmi_get_notification_instance_data(handle); + if (!ni) return -ENODEV; - ni = handle->notify_priv; evt_key = MAKE_HASH_KEY(proto_id, evt_id, src_id ? *src_id : SRC_ID_MASK); @@ -1684,8 +1674,8 @@ int scmi_notification_init(struct scmi_handle *handle) INIT_WORK(&ni->init_work, scmi_protocols_late_init); + scmi_set_notification_instance_data(handle, ni); handle->notify_ops = ¬ify_ops; - handle->notify_priv = ni; /* Ensure handle is up to date */ smp_wmb(); @@ -1697,7 +1687,7 @@ int scmi_notification_init(struct scmi_handle *handle) err: dev_warn(handle->dev, "Initialization Failed.\n"); - devres_release_group(handle->dev, NULL); + devres_release_group(handle->dev, gid); return -ENOMEM; } @@ -1709,15 +1699,10 @@ void scmi_notification_exit(struct scmi_handle *handle) { struct scmi_notify_instance *ni; - /* Ensure notify_priv is updated */ - smp_rmb(); - if (!handle->notify_priv) + ni = scmi_get_notification_instance_data(handle); + if (!ni) return; - ni = handle->notify_priv; - - handle->notify_priv = NULL; - /* Ensure handle is up to date */ - smp_wmb(); + scmi_set_notification_instance_data(handle, NULL); /* Destroy while letting pending work complete */ destroy_workqueue(ni->notify_wq); diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h index 397af71bb07d..82611f564c66 100644 --- a/include/linux/scmi_protocol.h +++ b/include/linux/scmi_protocol.h @@ -608,8 +608,6 @@ struct scmi_notify_ops { * dedicated protocol handler * @put_ops: method to release a protocol * @notify_ops: pointer to set of notifications related operations - * @notify_priv: pointer to private data structure specific to notifications - * (for internal use only) */ struct scmi_handle { struct device *dev; @@ -626,7 +624,6 @@ struct scmi_handle { void (*put_ops)(const struct scmi_handle *handle, u8 proto); const struct scmi_notify_ops *notify_ops; - void *notify_priv; }; enum scmi_std_protocol {