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 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 26601C47DAF for ; Fri, 19 Jan 2024 15:27:10 +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:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc: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=HEa95GaIpN1kdgNYqTpOyoK5rZ/opa03OYtHmYAcPow=; b=tcunmajwEjmR8d Y4c5+x5BVqnefzVDIOOkdVHpFSyTwp0uVhfzZlFAsDZ1J105QRIkjZHFDecXiXM7QiZ9t3xRYDQoM QRd0TXi10ck0PA81oYP5rJhIWa/4Ydv2ZE2hxca0MZGI/OQg8TpefaIM+rT3hRfKcbjTsDt1xNQvc YbjK5enJhslZNI513YTepCbEvWSr/26nqcfcj6fQWSlLqo1NONJ1G5+RtrI3uX/VhczU6SpRXBlUt VHdPiplDzWoI2R5T/NhG22pgxhpknvoSQVg9P/OWElKGMn1rj+mJuB4NWhWHN8snJ6Fn3FQ/3F1Z4 0WCc8lQ6chAeH+ppFQHw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1rQqlZ-005zsT-1E; Fri, 19 Jan 2024 15:26:45 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1rQqlW-005zrn-1a for linux-arm-kernel@lists.infradead.org; Fri, 19 Jan 2024 15:26:44 +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 66B86DA7; Fri, 19 Jan 2024 07:27:23 -0800 (PST) Received: from pluto (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 8323F3F5A1; Fri, 19 Jan 2024 07:26:36 -0800 (PST) Date: Fri, 19 Jan 2024 15:26:33 +0000 From: Cristian Marussi To: Sudeep Holla Cc: linux-arm-kernel@lists.infradead.org, Pierre Gondois Subject: Re: [PATCH v2] firmware: arm_scmi: Warn if domain frequency multiplier is 0 or rounded off Message-ID: References: <20240119111033.3011853-1-sudeep.holla@arm.com> <20240119152338.3047620-1-sudeep.holla@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20240119152338.3047620-1-sudeep.holla@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240119_072642_664454_6038BA05 X-CRM114-Status: GOOD ( 20.95 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Jan 19, 2024 at 03:23:37PM +0000, Sudeep Holla wrote: > When (sustained_freq_khz * 1000) is less than sustained_perf_level, the > multiplier will be less than 1 and hence rounded down as 0. Similarly if > it is not multiple of sustained_perf_level the dom_info->mult_factor will > contain rounded down value and will end up impacting all the frequency > calculations done using it. > > Add warning if and when the domain frequency multiplier is 0 or rounded > down so that it gives a clue to get the firmware tables fixed. > > Suggested-by: Pierre Gondois > Reviewed-by: Pierre Gondois > Reviewed-by: Cristian Marussi > Signed-off-by: Sudeep Holla > --- LGTM. Thanks, Cristian > drivers/firmware/arm_scmi/perf.c | 19 +++++++++++++++++-- > 1 file changed, 17 insertions(+), 2 deletions(-) > > v1->v2: > - Added comment regarding the requirements on sustained_freq_khz > and sustained_perf_level obtained from the SCMI firmware > - Changed pr_warn to dev_warn > > diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c > index 8ea2a7b3d35d..9fe123e1f3c7 100644 > --- a/drivers/firmware/arm_scmi/perf.c > +++ b/drivers/firmware/arm_scmi/perf.c > @@ -270,15 +270,30 @@ scmi_perf_domain_attributes_get(const struct scmi_protocol_handle *ph, > le32_to_cpu(attr->sustained_freq_khz); > dom_info->sustained_perf_level = > le32_to_cpu(attr->sustained_perf_level); > + /* > + * sustained_freq_khz = mult_factor * sustained_perf_level > + * mult_factor must be non zero positive integer(not fraction) > + */ > if (!dom_info->sustained_freq_khz || > !dom_info->sustained_perf_level || > - dom_info->level_indexing_mode) > + dom_info->level_indexing_mode) { > /* CPUFreq converts to kHz, hence default 1000 */ > dom_info->mult_factor = 1000; > - else > + } else { > dom_info->mult_factor = > (dom_info->sustained_freq_khz * 1000UL) > / dom_info->sustained_perf_level; > + if ((dom_info->sustained_freq_khz * 1000UL) % > + dom_info->sustained_perf_level) > + dev_warn(ph->dev, > + "multiplier for domain %d rounded\n", > + dom_info->id); > + } > + if (!dom_info->mult_factor) > + dev_warn(ph->dev, > + "Wrong sustained perf/frequency(domain %d)\n", > + dom_info->id); > + > strscpy(dom_info->info.name, attr->name, > SCMI_SHORT_NAME_MAX_SIZE); > } > -- > 2.43.0 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel