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 385A5CCF9E3 for ; Mon, 10 Nov 2025 17:34:56 +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=VRrMPiScGAkxq2o3CAM6RtgVvc3fZqxcR9AIGzfTzIQ=; b=G7RkvtDPpu+Zz2fwABJRtIb4gL OlUn4r6LLQT1QgZkAAuV/vfZgADUAw538/TPJ331dXf2IUO6U9Sp08y69KA9B6edaYb9gwDMyWGlw Ql8mDBuIOVzpaW5RaJhm5z6Rg2YmrEJBb/noZM6O2srs228B8G9oQIJAz8rsenDkF2598IeSru0/h 157kvm6fba1VT+QrfkZ7dBiVtL01c8ELh9w5lnJcX2RMkGAVC00kaKjegcyGpS+5afyQ7FqlIjLc7 roNV4+i2VgFaj1AMzifzjgHij5toBT4ikmwRKpJJBMFwMaB5O821IPkx6I2fk2gDocPZePWwlGmzK /zHcsLQw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vIVn0-00000005v2s-0P3p; Mon, 10 Nov 2025 17:34:50 +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 1vIVmy-00000005v1w-0R3X for linux-arm-kernel@lists.infradead.org; Mon, 10 Nov 2025 17:34:49 +0000 Received: from mail.maildlp.com (unknown [172.18.186.216]) by frasgout.his.huawei.com (SkyGuard) with ESMTPS id 4d4xcP5p8nzHnH4q; Tue, 11 Nov 2025 01:34:29 +0800 (CST) Received: from dubpeml100005.china.huawei.com (unknown [7.214.146.113]) by mail.maildlp.com (Postfix) with ESMTPS id 534951400D9; Tue, 11 Nov 2025 01:34:45 +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 17:34:43 +0000 Date: Mon, 10 Nov 2025 17:34:42 +0000 From: Jonathan Cameron To: Ben Horgan CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Fenghua Yu Subject: Re: [PATCH 31/33] arm_mpam: Add helper to reset saved mbwu state Message-ID: <20251110173442.000053fe@huawei.com> In-Reply-To: <20251107123450.664001-32-ben.horgan@arm.com> References: <20251107123450.664001-1-ben.horgan@arm.com> <20251107123450.664001-32-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_093448_286824_CF133437 X-CRM114-Status: UNSURE ( 9.20 ) 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 12:34:48 +0000 Ben Horgan wrote: > From: James Morse > > resctrl expects to reset the bandwidth counters when the filesystem > is mounted. > > To allow this, add a helper that clears the saved mbwu state. Instead > of cross calling to each CPU that can access the component MSC to > write to the counter, set a flag that causes it to be zero'd on the > the next read. This is easily done by forcing a configuration update. > > Signed-off-by: James Morse > Reviewed-by: Fenghua Yu > Tested-by: Fenghua Yu > Cc: Peter Newman > Signed-off-by: Ben Horgan Reviewed-by: Jonathan Cameron