From patchwork Sun Feb 13 20:12:42 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suman Anna X-Patchwork-Id: 12744678 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id CC11CC433EF for ; Sun, 13 Feb 2022 20:14:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version: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=f4ThAntLbwdzkayBM2V9fcJ9ogvxEpd2AvlI4+mVq4g=; b=1PkWfVvVcyzGOV n9FODgmoMEHUCWq35y5qGACcp9TcZtj47HNTDP4WOy+R6W5CkA+YEuG+gKwA7C9LoznSDQSLHOTDk ql96o20UUUpawfDpqEL00V4TeIJZrpcHBE0z0GMeRHoBlvVGZwHOzfckrRXmQlcyRj5PjYWPqEHXY /4N6so8dAyQCk5kYMSxaXvxrZBMyufP8Bq7H6I/OYgRW6YNa340z3UrPICfmmlHDkqs8pShADzjAD JvGJ5tclQGo9rj8UiA0AobVe1G/NXpvHd/lYziXExpAFhCq4U/WQcBgtaKx5/R5i1xZ+i/WoHuIsf rJJAvnTLS5NbSpjnAu7A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nJLF5-00CSqC-L3; Sun, 13 Feb 2022 20:13:07 +0000 Received: from lelv0143.ext.ti.com ([198.47.23.248]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nJLEs-00CSmu-Dz for linux-arm-kernel@lists.infradead.org; Sun, 13 Feb 2022 20:12:56 +0000 Received: from fllv0035.itg.ti.com ([10.64.41.0]) by lelv0143.ext.ti.com (8.15.2/8.15.2) with ESMTP id 21DKCo2o015311; Sun, 13 Feb 2022 14:12:50 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1644783170; bh=9irqzYnrEpjWi9U3Xpk+DuQR+/hIGdWOOh9XnlBDeH0=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=mqg31rRxFQoh9uwzs82GMt0MYdPhhWfznOUXujfzScP9BPiB9oEvpG9sReET0AjX9 OtRcQWYqnyKRruiKwRtT2B2XjD5PiBLiSNRE/MDF7kf/AMNm3YWaRtJJMJqA+3CmuQ XfVL4RS4YHzTac7dWMvEE8G7Tup6ynevoVe+5Jck= Received: from DLEE103.ent.ti.com (dlee103.ent.ti.com [157.170.170.33]) by fllv0035.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 21DKCogc065496 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Sun, 13 Feb 2022 14:12:50 -0600 Received: from DLEE109.ent.ti.com (157.170.170.41) by DLEE103.ent.ti.com (157.170.170.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14; Sun, 13 Feb 2022 14:12:49 -0600 Received: from fllv0040.itg.ti.com (10.64.41.20) by DLEE109.ent.ti.com (157.170.170.41) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14 via Frontend Transport; Sun, 13 Feb 2022 14:12:49 -0600 Received: from lelv0854.itg.ti.com (lelv0854.itg.ti.com [10.181.64.140]) by fllv0040.itg.ti.com (8.15.2/8.15.2) with ESMTP id 21DKCnQO085417; Sun, 13 Feb 2022 14:12:49 -0600 Received: from localhost ([10.249.37.221]) by lelv0854.itg.ti.com (8.14.7/8.14.7) with ESMTP id 21DKCnNG002412; Sun, 13 Feb 2022 14:12:49 -0600 From: Suman Anna To: Bjorn Andersson , Mathieu Poirier Subject: [PATCH v3 1/5] remoteproc: Change rproc_shutdown() to return a status Date: Sun, 13 Feb 2022 14:12:42 -0600 Message-ID: <20220213201246.25952-2-s-anna@ti.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220213201246.25952-1-s-anna@ti.com> References: <20220213201246.25952-1-s-anna@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220213_121254_603223_9EF43CCD X-CRM114-Status: GOOD ( 19.79 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Praneeth Bajjuri , linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Hari Nagalla Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The rproc_shutdown() function is currently not returning any error code, and any failures within rproc_stop() are not passed back to the users. Change the signature to return a success value back to the callers. The remoteproc sysfs and cdev interfaces are also updated to return back this status to userspace. Signed-off-by: Suman Anna --- v3: - New patch in place of v2 patch "remoteproc: Add support for detach-only during shutdown", https://patchwork.kernel.org/project/linux-remoteproc/patch/20210723220248.6554-2-s-anna@ti.com/ Documentation/staging/remoteproc.rst | 3 ++- drivers/remoteproc/remoteproc_cdev.c | 2 +- drivers/remoteproc/remoteproc_core.c | 9 ++++++--- drivers/remoteproc/remoteproc_sysfs.c | 2 +- include/linux/remoteproc.h | 2 +- 5 files changed, 11 insertions(+), 7 deletions(-) diff --git a/Documentation/staging/remoteproc.rst b/Documentation/staging/remoteproc.rst index 9cccd3dd6a4b..348ee7e508ac 100644 --- a/Documentation/staging/remoteproc.rst +++ b/Documentation/staging/remoteproc.rst @@ -49,13 +49,14 @@ might also consider using dev_archdata for this). :: - void rproc_shutdown(struct rproc *rproc) + int rproc_shutdown(struct rproc *rproc) Power off a remote processor (previously booted with rproc_boot()). In case @rproc is still being used by an additional user(s), then this function will just decrement the power refcount and exit, without really powering off the device. +Returns 0 on success, and an appropriate error value otherwise. Every call to rproc_boot() must (eventually) be accompanied by a call to rproc_shutdown(). Calling rproc_shutdown() redundantly is a bug. diff --git a/drivers/remoteproc/remoteproc_cdev.c b/drivers/remoteproc/remoteproc_cdev.c index 4ad98b0b8caa..906ff3c4dfdd 100644 --- a/drivers/remoteproc/remoteproc_cdev.c +++ b/drivers/remoteproc/remoteproc_cdev.c @@ -42,7 +42,7 @@ static ssize_t rproc_cdev_write(struct file *filp, const char __user *buf, size_ rproc->state != RPROC_ATTACHED) return -EINVAL; - rproc_shutdown(rproc); + ret = rproc_shutdown(rproc); } else if (!strncmp(cmd, "detach", len)) { if (rproc->state != RPROC_ATTACHED) return -EINVAL; diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c index 69f51acf235e..c510125769b9 100644 --- a/drivers/remoteproc/remoteproc_core.c +++ b/drivers/remoteproc/remoteproc_core.c @@ -2061,16 +2061,18 @@ EXPORT_SYMBOL(rproc_boot); * which means that the @rproc handle stays valid even after rproc_shutdown() * returns, and users can still use it with a subsequent rproc_boot(), if * needed. + * + * Return: 0 on success, and an appropriate error value otherwise */ -void rproc_shutdown(struct rproc *rproc) +int rproc_shutdown(struct rproc *rproc) { struct device *dev = &rproc->dev; - int ret; + int ret = 0; ret = mutex_lock_interruptible(&rproc->lock); if (ret) { dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret); - return; + return ret; } /* if the remote proc is still needed, bail out */ @@ -2097,6 +2099,7 @@ void rproc_shutdown(struct rproc *rproc) rproc->table_ptr = NULL; out: mutex_unlock(&rproc->lock); + return ret; } EXPORT_SYMBOL(rproc_shutdown); diff --git a/drivers/remoteproc/remoteproc_sysfs.c b/drivers/remoteproc/remoteproc_sysfs.c index ea8b89f97d7b..645c70c8109b 100644 --- a/drivers/remoteproc/remoteproc_sysfs.c +++ b/drivers/remoteproc/remoteproc_sysfs.c @@ -206,7 +206,7 @@ static ssize_t state_store(struct device *dev, rproc->state != RPROC_ATTACHED) return -EINVAL; - rproc_shutdown(rproc); + ret = rproc_shutdown(rproc); } else if (sysfs_streq(buf, "detach")) { if (rproc->state != RPROC_ATTACHED) return -EINVAL; diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h index e0600e1e5c17..cfc0c95c95b2 100644 --- a/include/linux/remoteproc.h +++ b/include/linux/remoteproc.h @@ -669,7 +669,7 @@ rproc_of_resm_mem_entry_init(struct device *dev, u32 of_resm_idx, size_t len, u32 da, const char *name, ...); int rproc_boot(struct rproc *rproc); -void rproc_shutdown(struct rproc *rproc); +int rproc_shutdown(struct rproc *rproc); int rproc_detach(struct rproc *rproc); int rproc_set_firmware(struct rproc *rproc, const char *fw_name); void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type);