From mboxrd@z Thu Jan 1 00:00:00 1970 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=-8.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 AC15CC3F2C0 for ; Thu, 27 Feb 2020 21:59:52 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 7DDAF246A1 for ; Thu, 27 Feb 2020 21:59:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="uK2IX+OQ"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="da4qGju1" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7DDAF246A1 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-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=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=6wjiibfwfYdDQPq/HZKsebEVfySvyrvW4SvZ4/JXShw=; b=uK2IX+OQ6x9zQH 0p5CSBlVlqZM5WXVKk+rQkm4ZGOLq+2weK1eEyFsPUzmGroYa8LM5zFKjuMTOAuL4hU1DFhfJjsyw qzVL7IwjMr8X2NTZSGWXJ60IJuD1F3sluaPwtEMBI6wmko8aoPXshNBdV0QgsrZj0mmfVzbfBt1n2 Y6O9IylNOB0MzUFjaAp36vwBLnEDw0YikYVi7tO3OMC1m3TZBMoF2zX/Qs2VhObUdniTY9/4Pstqq +jea+HsgaTJ4XMVJsdosefskaH4O1YI7hros8IULm/nAWMHOHevuZE3hgxFhgwM+zI0ueAbDVOosq jJvtGvqqtG9D6dKkB9/Q==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1j7RCC-0007Tu-19; Thu, 27 Feb 2020 21:59:52 +0000 Received: from mail-pj1-x1044.google.com ([2607:f8b0:4864:20::1044]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1j7RC7-0007T8-8Z for linux-arm-kernel@lists.infradead.org; Thu, 27 Feb 2020 21:59:50 +0000 Received: by mail-pj1-x1044.google.com with SMTP id ep11so367377pjb.2 for ; Thu, 27 Feb 2020 13:59:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=fTXwSB4VEwuhKImP00VDYWj8Af4ja5hCUGthoXkzd7w=; b=da4qGju1+eZ2u8i58+SFACyeBx7k8na1SwRT59gr6pARxKA7OBl7JlfyCR7xI1I3Kf /V/VJ1QOH11rKWuOKFg6KOIQSn+Jf7ZnhVidCNFdPdLe5622MrW8OtaZUl+w8nDRJzjC iU0mCfwyleneSgcMGPjzjbS919tBWgh52msMkbxy2L20TrjcgDaEEE4U+t6Xx4ARA6EY Pd7KbZc4mLkKkKvANfjruzXD6s8EcFm28mA+EXMt6QkUik1OE0lYSQ+hOAKbF+NE85Tg D0yvxM69y5mK8RJgJVo1EUow5kIadB0W6kCJP3apUHPOEgrj7i7YFk3BPvb13ic6uso0 TA/w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=fTXwSB4VEwuhKImP00VDYWj8Af4ja5hCUGthoXkzd7w=; b=uURMlT1Pdqgab5zBWHM74WENZmExLfJTVvsFJf8f/e9hNpSNW67poNftEDrhFQBaR2 RCqRtYQf7gaRy3HI//Qp6mUEi0N5O9hhxA1bTX+mkwAQcYR4hpArUUAKN+jURmJY1ugy ewDIc5Mnp2TrjFM4F0ejKyD5Ipt3oqcHxur3gtykDYV3mFwHJ0SMFBxVoupIl/ZTWutR EaCgX29rTg6vMI0BNxboAVHqw9L1yvYL6Z6sdxqNBT82S4DLSE24VxW3b2ueRFZ4N9YS 30QA9XZP1kgdezLMcS8VSO6pzL0sMs6ZthXdsL/VjTEgzfYbspGjUdQcWiqF3hnF77hD RJFQ== X-Gm-Message-State: APjAAAWFO5iPnTguPfm6y0e9e74nXEhTBEerZ/7SzxESUfSdgfllN7VB rgwQBAkI5mCD9Dwai1VRM7ylxZbQEt4= X-Google-Smtp-Source: APXvYqyJbAO6h6eSnb87jvQLhMjQwDPCpkhG8rjKyddMg705cLOaRbLZ4Ipmh0A78bB2EbWpjwj77A== X-Received: by 2002:a17:902:c113:: with SMTP id 19mr899784pli.138.1582840783021; Thu, 27 Feb 2020 13:59:43 -0800 (PST) Received: from xps15 (S0106002369de4dac.cg.shawcable.net. [68.147.8.254]) by smtp.gmail.com with ESMTPSA id p21sm8081275pfn.103.2020.02.27.13.59.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Feb 2020 13:59:42 -0800 (PST) Date: Thu, 27 Feb 2020 14:59:40 -0700 From: Mathieu Poirier To: Siddharth Gupta Subject: Re: [PATCH 6/6] remoteproc: qcom: Add notification types to SSR Message-ID: <20200227215940.GC20116@xps15> References: <1582167465-2549-1-git-send-email-sidgup@codeaurora.org> <1582167465-2549-7-git-send-email-sidgup@codeaurora.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1582167465-2549-7-git-send-email-sidgup@codeaurora.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200227_135947_337662_7000C304 X-CRM114-Status: GOOD ( 23.97 ) 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: ohad@wizery.com, tsoni@codeaurora.org, linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, bjorn.andersson@linaro.org, agross@kernel.org, rishabhb@codeaurora.org, psodagud@codeaurora.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Feb 19, 2020 at 06:57:45PM -0800, Siddharth Gupta wrote: > The SSR subdevice only adds callback for the unprepare event. Add callbacks > for unprepare, start and prepare events. The client driver for a particular > remoteproc might be interested in knowing the status of the remoteproc > while undergoing SSR, not just when the remoteproc has finished shutting > down. > > Signed-off-by: Siddharth Gupta > --- > drivers/remoteproc/qcom_common.c | 39 +++++++++++++++++++++++++++++++++++---- > include/linux/remoteproc.h | 15 +++++++++++++++ > 2 files changed, 50 insertions(+), 4 deletions(-) > > diff --git a/drivers/remoteproc/qcom_common.c b/drivers/remoteproc/qcom_common.c > index 6714f27..6f04a5b 100644 > --- a/drivers/remoteproc/qcom_common.c > +++ b/drivers/remoteproc/qcom_common.c > @@ -183,9 +183,9 @@ EXPORT_SYMBOL_GPL(qcom_remove_smd_subdev); > * > * Returns pointer to srcu notifier head on success, ERR_PTR on failure. > * > - * This registers the @notify function as handler for restart notifications. As > - * remote processors are stopped this function will be called, with the rproc > - * pointer passed as a parameter. > + * This registers the @notify function as handler for powerup/shutdown > + * notifications. This function will be invoked inside the callbacks registered > + * for the ssr subdevice, with the rproc pointer passed as a parameter. > */ > void *qcom_register_ssr_notifier(struct rproc *rproc, struct notifier_block *nb) > { > @@ -227,11 +227,39 @@ int qcom_unregister_ssr_notifier(void *notify, struct notifier_block *nb) > } > EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier); > > +static int ssr_notify_prepare(struct rproc_subdev *subdev) > +{ > + struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev); > + > + srcu_notifier_call_chain(ssr->rproc_notif_list, > + RPROC_BEFORE_POWERUP, (void *)ssr->name); > + return 0; > +} > + > +static int ssr_notify_start(struct rproc_subdev *subdev) > +{ > + struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev); > + > + srcu_notifier_call_chain(ssr->rproc_notif_list, > + RPROC_AFTER_POWERUP, (void *)ssr->name); > + return 0; > +} > + > +static void ssr_notify_stop(struct rproc_subdev *subdev, bool crashed) > +{ > + struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev); > + > + srcu_notifier_call_chain(ssr->rproc_notif_list, > + RPROC_BEFORE_SHUTDOWN, (void *)ssr->name); > +} > + > + > static void ssr_notify_unprepare(struct rproc_subdev *subdev) > { > struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev); > > - srcu_notifier_call_chain(ssr->rproc_notif_list, 0, (void *)ssr->name); > + srcu_notifier_call_chain(ssr->rproc_notif_list, > + RPROC_AFTER_SHUTDOWN, (void *)ssr->name); > } > > /** > @@ -248,6 +276,9 @@ void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr, > { > ssr->name = ssr_name; > ssr->subdev.name = kstrdup("ssr_notifs", GFP_KERNEL); > + ssr->subdev.prepare = ssr_notify_prepare; > + ssr->subdev.start = ssr_notify_start; > + ssr->subdev.stop = ssr_notify_stop; Now that I have a better understanding of what this patchset is doing, I realise my comments in patch 04 won't work. To differentiate the subdevs of an rproc I suggest to wrap them in a generic structure with a type and an enum. That way you can differenciate between subdevices without having to add to the core. That being said, I don't understand what patches 5 and 6 are doing... Registering with the global ssr_notifiers allowed to gracefully shutdown all the MCUs in the system when one of them would go down. But now that we are using the notifier on a per MCU, I really don't see why each subdev couldn't implement the right prepare/start/stop functions. Am I missing something here? > ssr->subdev.unprepare = ssr_notify_unprepare; > ssr->rproc_notif_list = kzalloc(sizeof(struct srcu_notifier_head), > GFP_KERNEL); > diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h > index e2f60cc..4be4478 100644 > --- a/include/linux/remoteproc.h > +++ b/include/linux/remoteproc.h > @@ -449,6 +449,21 @@ struct rproc_dump_segment { > }; > > /** > + * enum rproc_notif_type - Different stages of remoteproc notifications > + * @RPROC_BEFORE_SHUTDOWN: unprepare stage of remoteproc > + * @RPROC_AFTER_SHUTDOWN: stop stage of remoteproc > + * @RPROC_BEFORE_POWERUP: prepare stage of remoteproc > + * @RPROC_AFTER_POWERUP: start stage of remoteproc > + */ > +enum rproc_notif_type { > + RPROC_BEFORE_SHUTDOWN, > + RPROC_AFTER_SHUTDOWN, > + RPROC_BEFORE_POWERUP, > + RPROC_AFTER_POWERUP, > + RPROC_MAX > +}; > + > +/** > * struct rproc - represents a physical remote processor device > * @node: list node of this rproc object > * @domain: iommu domain > -- > Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, > a Linux Foundation Collaborative Project > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel