From patchwork Mon Jul 22 04:01:19 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zeng Heng X-Patchwork-Id: 13738241 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 157D1C3DA59 for ; Mon, 22 Jul 2024 04:06:57 +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=lkjtJCyKIlSrpPSWGRfMVE8S65/5TmJQlE6/0aPi9RE=; b=PAiBNmxz7aE/PewXx+e9iY3vBL HEim+dgKpDr0GwJzafQ5m7/PdtSttNdkGB8v+s0cn9Sd7thaL9js9aHWDEFFwKHM5hCqPlYDivKM4 4JYL9XHYxOCBjXtAgPcUJiz8zya4+AYp4iJcX5mGPyqx03709VI340xlmak4Tp1T9LCG0ASlJ/u/P U1g3MIakLhH0AV04H7gySyplasImvW7Fhr1sbYEcMKDR4UwIZdYsHD6azYsuenVT29gN3JRLrws6v PgDEujPIl2TPsv3oycDM58PFmluJ8BEhwgy/KTiHuFKPMj4KMzXtw8L+oCSSjibaaQG4OTcyMvspn G6B8QO7g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sVkJz-00000008HAD-33rA; Mon, 22 Jul 2024 04:06:47 +0000 Received: from szxga01-in.huawei.com ([45.249.212.187]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sVkIx-00000008GlJ-389b for linux-arm-kernel@lists.infradead.org; Mon, 22 Jul 2024 04:05:47 +0000 Received: from mail.maildlp.com (unknown [172.19.88.194]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4WS64w0hlBzxTfL; Mon, 22 Jul 2024 12:00:32 +0800 (CST) Received: from kwepemf100008.china.huawei.com (unknown [7.202.181.222]) by mail.maildlp.com (Postfix) with ESMTPS id 3E5BF1402CA; Mon, 22 Jul 2024 12:05:30 +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; Mon, 22 Jul 2024 12:05:29 +0800 From: Zeng Heng To: , , , CC: , , , Subject: [PATCH mpam/v6.10-rc1 RFC 2/4] arm_mpam: Fix the range calculation of the implemented bits Date: Mon, 22 Jul 2024 12:01:19 +0800 Message-ID: <20240722040121.515021-3-zengheng4@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240722040121.515021-1-zengheng4@huawei.com> References: <20240722040121.515021-1-zengheng4@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.103.91] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) 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-20240721_210543_991124_C30BDE23 X-CRM114-Status: GOOD ( 11.69 ) 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 The implemented bits of the MAX field in the MPAMCFG_{MBW_MAX, CMAX} register are always to the left of the field, so the validated range should be like [15, 15 - width + 1]. 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 a217f2e1f350..e87fca6fc5fd 100644 --- a/drivers/platform/arm64/mpam/mpam_resctrl.c +++ b/drivers/platform/arm64/mpam/mpam_resctrl.c @@ -585,7 +585,7 @@ static u16 percent_to_mbw_max(u8 pc, struct mpam_props *cprops) break; } - value &= GENMASK(15, 15 - cprops->bwa_wd); + value &= GENMASK(15, 15 - cprops->bwa_wd + 1); return value; }