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=-5.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 64309C432C0 for ; Wed, 27 Nov 2019 18:40:26 +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 3756D20835 for ; Wed, 27 Nov 2019 18:40:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="gWvMtuHh" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3756D20835 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com 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-Type: Content-Transfer-Encoding:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=UnpTZs8vX3AW9JVCnmMdT3n1tUvDGd0oA+f8nZM/sAY=; b=gWvMtuHhczPfSKfJqrXSzbWsk PpYJbrStn9OTzqThh2nWDlT6l4BiEq2Hvhc4qXIQ+pn+NAdEbrE4hDcXjqMHvyze+sYU9+TgcM9hv Jc5HXn5GroQA7omv5g2M4ZQ9QLvaAS42NGqmfWv94xSiFhZm+XCHAAzCzvGJ0wYUhSQePe3ijwmeC JPF9L7KZky6GYZopaGvQrZJzshXzwbFE9RRa1bJprg0B8pEnemVMVmwwZl+gZqc0Qu7s4GqQWpN8x cjmiurfRnbhP3YsJaaP0XcG9SLlFB74uj3AIofC5m4WlkHKPrmCP49m1ay9aVngMFwe40+nSXEF4g fUSrdYO7g==; 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 1ia2Eh-0000GH-5y; Wed, 27 Nov 2019 18:40:23 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1ia2Ee-0000Fo-B4 for linux-arm-kernel@lists.infradead.org; Wed, 27 Nov 2019 18:40:21 +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 72E0F31B; Wed, 27 Nov 2019 10:40:19 -0800 (PST) Received: from [10.1.197.1] (ewhatever.cambridge.arm.com [10.1.197.1]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id A46543F6C4; Wed, 27 Nov 2019 10:40:18 -0800 (PST) Subject: Re: [PATCH v5 04/14] coresight: cti: Add sysfs trigger / channel programming API To: Mike Leach , coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-doc@vger.kernel.org References: <20191119231912.12768-1-mike.leach@linaro.org> <20191119231912.12768-5-mike.leach@linaro.org> From: Suzuki Kuruppassery Poulose Message-ID: Date: Wed, 27 Nov 2019 18:40:17 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: <20191119231912.12768-5-mike.leach@linaro.org> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191127_104020_424088_43156DDF X-CRM114-Status: GOOD ( 13.31 ) 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: mathieu.poirier@linaro.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 19/11/2019 23:19, Mike Leach wrote: > Adds a user API to allow programming of CTI by trigger ID and > channel number. This will take the channel and trigger ID supplied > by the user and program the appropriate register values. > > Signed-off-by: Mike Leach > --- > + > +static ssize_t chan_xtrigs_view_show(struct device *dev, > + struct device_attribute *attr, > + char *buf) > +{ > + struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent); > + struct cti_config *cfg = &drvdata->config; > + int used = 0, reg_idx; > + int buf_sz = PAGE_SIZE; > + u32 chan_mask = BIT(cfg->xtrig_rchan_sel); > + > + used += scnprintf(buf, buf_sz, "[%d] IN: ", cfg->xtrig_rchan_sel); > + for (reg_idx = 0; > + reg_idx < drvdata->config.nr_trig_max; > + reg_idx++) { > + if (chan_mask & cfg->ctiinen[reg_idx]) { > + used += scnprintf(buf + used, buf_sz - used, "%d ", > + reg_idx); > + } > + } As a security measure, we must make sure that we have space left in the buffer. We could end up passing "negative" numbers for the size argument, in the worst case. > + > + used += scnprintf(buf + used, buf_sz - used, "OUT: "); > + for (reg_idx = 0; > + reg_idx < drvdata->config.nr_trig_max; > + reg_idx++) { > + if (chan_mask & cfg->ctiouten[reg_idx]) { > + used += scnprintf(buf + used, buf_sz - used, "%d ", > + reg_idx); > + } > + } > + used += scnprintf(buf + used, buf_sz - used, "\n"); > + return used; > +} > +static DEVICE_ATTR_RW(chan_xtrigs_view); The rest looks fine to me. Suzuki _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel