From patchwork Sat Jul 13 06:09:41 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zeng Heng X-Patchwork-Id: 13732344 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 8D7C3C3DA45 for ; Sat, 13 Jul 2024 06:14:26 +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-Type: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date :Subject:CC:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=brU47bW0+7nNUJ0E/xqNnW8xrqFS7bTUYdQSxvuDvkQ=; b=StqRsD6e62ycAIB8KyUU112M1B SMeaxMmU1IemB/emhLoTu+8u0f2W4s/YLLH1kIt/dc74bhmDr35C4gtDXoZFCB27mWck3veQ5bE2R Bud1tKDKvPSWtArXvfqEeV74qAxg1QzBgV1exFTYjdK3JOaJ+Le+8X+s6s7k6ZK+aEeCaXsIB3d62 E99xbQ7Q0erTdvUX5FovhSlg10h2+Fx+Z95Y3iLrbMbJPgbb2Ybq7zDLU3IH6oJSCgCmFB8UQbkLZ QhKcHMPymAir0bvotfFhXSs91UX7I3lvYZKP+BC1EidC6fnYgFshaHHUGYrnAXDbhLE+9o0MGusDw qKNvIoDQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sSW1D-000000020Fe-2FNJ; Sat, 13 Jul 2024 06:14:03 +0000 Received: from szxga03-in.huawei.com ([45.249.212.189]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sSW0t-0000000209H-2jI2 for linux-arm-kernel@lists.infradead.org; Sat, 13 Jul 2024 06:13:45 +0000 Received: from mail.maildlp.com (unknown [172.19.88.194]) by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4WLdMy2fxgzQlSJ; Sat, 13 Jul 2024 14:09:34 +0800 (CST) Received: from kwepemf100008.china.huawei.com (unknown [7.202.181.222]) by mail.maildlp.com (Postfix) with ESMTPS id 44C87140361; Sat, 13 Jul 2024 14:13:33 +0800 (CST) Received: from huawei.com (10.175.103.91) by kwepemf100008.china.huawei.com (7.202.181.222) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Sat, 13 Jul 2024 14:13:32 +0800 From: Zeng Heng To: CC: , Subject: [PATCH v6.10-rc1 1/4] arm_mpam: Correct MBA granularity calculation Date: Sat, 13 Jul 2024 14:09:41 +0800 Message-ID: <20240713060944.2725647-2-zengheng4@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240713060944.2725647-1-zengheng4@huawei.com> References: <20240713060944.2725647-1-zengheng4@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.103.91] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To kwepemf100008.china.huawei.com (7.202.181.222) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240712_231343_901706_2133D1A9 X-CRM114-Status: GOOD ( 10.11 ) 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 Correct MBA granularity calculation function. As said in the comments, "bwa_wd is the number of bits implemented in the 0.xxx fixed point fraction". Fixes: 867471fefd5c ("SPLIT untested: arm_mpam: resctrl: Add support for MB resource") Signed-off-by: Zeng Heng --- drivers/platform/arm64/mpam/mpam_resctrl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/platform/arm64/mpam/mpam_resctrl.c b/drivers/platform/arm64/mpam/mpam_resctrl.c index 2fa732a42d4f..a217f2e1f350 100644 --- a/drivers/platform/arm64/mpam/mpam_resctrl.c +++ b/drivers/platform/arm64/mpam/mpam_resctrl.c @@ -523,7 +523,7 @@ static u32 get_mba_granularity(struct mpam_props *cprops) * bwa_wd is the number of bits implemented in the 0.xxx * fixed point fraction. 1 bit is 50%, 2 is 25% etc. */ - return MAX_MBA_BW / (cprops->bwa_wd + 1); + return MAX_MBA_BW / (1 << cprops->bwa_wd); } return 0;