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 0927ACCF9E3 for ; Mon, 10 Nov 2025 17:33:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To: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=RmvcaiH1tVwuPO3wp5wOaIz+xlxUZBeLwSdfr2/G5BQ=; b=B1EiAGuabuVXa6/9llCDinL9b8 bnskZOZ+icjfKkKiS6J+9F3lgm1qWivmqpcqwNkG2JX9io7eKBiAROFsfIRzdAyQ2P/TWJynIqoTg GU7WKjoib1rH4kmxdETkdk77fy55DYVpvQNHVijMbvMKmf9F0L+FfitlyTyewKJ5+DiLixZdJY6Tu Pe6DPGf4fTAaElWAzWxB4uw0NXA1x2EtexUZRZ2n4M+M28G99pgnDN7RbqOY/J7UMSLO1mPUaXCzN bsvWduOSrzdcp+8NMlX83KUxcvBZK3BpnGJ9qAfR+Gi/CE9SPMCP9VAWvNdqeFs2Jm+JDbcDdaZLu DzfJ3cZw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vIVlO-00000005uSW-0iMv; Mon, 10 Nov 2025 17:33:10 +0000 Received: from frasgout.his.huawei.com ([185.176.79.56]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vIVlL-00000005uS8-3xJs for linux-arm-kernel@lists.infradead.org; Mon, 10 Nov 2025 17:33:09 +0000 Received: from mail.maildlp.com (unknown [172.18.186.31]) by frasgout.his.huawei.com (SkyGuard) with ESMTPS id 4d4xZ84c61zJ46bj; Tue, 11 Nov 2025 01:32:32 +0800 (CST) Received: from dubpeml100005.china.huawei.com (unknown [7.214.146.113]) by mail.maildlp.com (Postfix) with ESMTPS id 3540314027A; Tue, 11 Nov 2025 01:33:02 +0800 (CST) Received: from localhost (10.203.177.15) by dubpeml100005.china.huawei.com (7.214.146.113) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.36; Mon, 10 Nov 2025 17:33:00 +0000 Date: Mon, 10 Nov 2025 17:32:59 +0000 From: Jonathan Cameron To: Ben Horgan CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Zeng Heng Subject: Re: [PATCH 28/33] arm_mpam: Consider overflow in bandwidth counter state Message-ID: <20251110173259.00002c88@huawei.com> In-Reply-To: <20251107123450.664001-29-ben.horgan@arm.com> References: <20251107123450.664001-1-ben.horgan@arm.com> <20251107123450.664001-29-ben.horgan@arm.com> X-Mailer: Claws Mail 4.3.0 (GTK 3.24.42; x86_64-w64-mingw32) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.203.177.15] X-ClientProxiedBy: lhrpeml500011.china.huawei.com (7.191.174.215) To dubpeml100005.china.huawei.com (7.214.146.113) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251110_093308_128154_FB721981 X-CRM114-Status: UNSURE ( 9.01 ) X-CRM114-Notice: Please train this message. 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, 7 Nov 2025 12:34:45 +0000 Ben Horgan wrote: > Use the overflow status bit to track overflow on each bandwidth counter > read and add the counter size to the correction when overflow is detected. > > This assumes that only a single overflow has occurred since the last read > of the counter. Overflow interrupts, on hardware that supports them could > be used to remove this limitation. > > Cc: Zeng Heng > Signed-off-by: Ben Horgan Reviewed-by: Jonathan Cameron