From patchwork Tue Apr 20 05:53:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Avri Altman X-Patchwork-Id: 424829 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 98F20C433B4 for ; Tue, 20 Apr 2021 05:53:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 73A8861104 for ; Tue, 20 Apr 2021 05:53:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229523AbhDTFyL (ORCPT ); Tue, 20 Apr 2021 01:54:11 -0400 Received: from esa5.hgst.iphmx.com ([216.71.153.144]:12062 "EHLO esa5.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230027AbhDTFyD (ORCPT ); Tue, 20 Apr 2021 01:54:03 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1618898012; x=1650434012; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=JFUux4KVzDdP8Fih8AzvsE90HWHsIn+1zpR633Gfcc8=; b=QMyDZrv12gzY1rXiSof0He5YNuPkdnMhiSDIPsRMX3JTZ/bjnI1I2xO6 W64UG9UzSExtdxcPW7kDXyG/lyGw1w2xGX+Ywtg9CTpXLvMAWNK/OPPX9 TYKOn1S6tlZmB3usmHaNWICe93etfbpz5tChFbE3VqLWqLkPMIvsLzQwu BMT0rp+BCQUcj00zRSrWETdExM1295lgR+NlMDCKEWOj2jQ3yFqC9AfVK iKbU7YNPcFyFcXmzE/echdpYZR657iBNJ7yDfu/UkqNL1exM/yr089Rlq ysaaAltC7vVYTsqE5sieh9JSEv0nqYaX1DcnNt289X9Ch94jbFULfSQcx A==; IronPort-SDR: 9yNgFEZc3sHAYB4pXh83QI8fe7ZKb3XYp5u4HT1GgVwBzljCRW/Dn/MLUALmIGOQjmNopjqQYB POMy5oMpot4QIWw6pvDWzqCRhlrtV8oRlLaHWt/46WSZtEt/gO3tZhDOaegxmMJqrFkVTsJWhV DghwjnJ9wObhf3jVPPbSXmuMr8T2sr7tEWvDX6ecm3MfCU5E6F+dzAegXnkFvpDr1H59ifpknV P3/kEQFCOqd6VZNu1zKUr7hB1bjAyGpH4syy7woAWXJxu/+IdwQ0B08ndkpQO9LhBEK7f+F/pD aMI= X-IronPort-AV: E=Sophos;i="5.82,236,1613404800"; d="scan'208";a="165514333" Received: from h199-255-45-15.hgst.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 20 Apr 2021 13:53:32 +0800 IronPort-SDR: tnHWxLFFuoZiKJaZs5skVN2hKCjWP7qvYbjgHmlFuQ1ThueQlyCxinvqeAlzrrtZbcTumt0f/z Uxd9bskig3K/9OkIhLA8ITtp6e34F8Pc5q7IUMzubx12KzyMFI2aq7QjgqPcg7DwHViMl7MPqu 9ZbJNTKFLo8BpTThKO2+JPWRimaQvP5RbgC7pZJT8h9JKcLdLMR8rVLSWJqOkP/2+9XgT7bFjD vVttYVsB77x0N9xgCXCbor12L8FUf1+CG7snfJgudMLWOeCT6fQ0zba6euUEB+VzL8c38cBGPg 9U9kFTKrPGKXoqGiapc5kpQW Received: from uls-op-cesaip01.wdc.com ([10.248.3.36]) by uls-op-cesaep02.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Apr 2021 22:32:39 -0700 IronPort-SDR: PANqtgwPXzfIIHQNwVNg8ZtYYTEwduwvMNVlo8WsFgTiU5VWHQYgJysY0vqvSVekqjA16dA2Do t/4TjaTTYnJrv+2agkMpzCZD8xMtrgVda3n1JY+GqzqqOfkGFfdlLQbkCVnDDA8wV1fgeWlnIx yZauTkF4qB4o7Z3AaPvVzBOAMc25UVQ/HzvZMKCPp4FKS3Qhoc0qoJqHDgButQQVXridGmEO8v 4km6sPgKpcwuQcP/1RbZoAYL9MdezM+wGLwuE/5k4h5xPBEd0B9QgFfkx4nfeJLhmCda3/HMk5 AIU= WDCIronportException: Internal Received: from bxygm33.sdcorp.global.sandisk.com ([10.0.231.247]) by uls-op-cesaip01.wdc.com with ESMTP; 19 Apr 2021 22:53:30 -0700 From: Avri Altman To: Ulf Hansson , linux-mmc@vger.kernel.org, Adrian Hunter Cc: linux-kernel@vger.kernel.org, Avri Altman Subject: [PATCH v3 0/2] Do not flush cache when it is disabled Date: Tue, 20 Apr 2021 08:53:04 +0300 Message-Id: <20210420055306.4858-1-avri.altman@wdc.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org v2 -> v3: - rebase onto recent cache changes v1 -> v2: - Attend Adrian's comments Cache is a temporary storage space in an eMMC device. Volatile by nature, the cache should in typical case reduce the access time compared to an access to the main nonvolatile storage. The cache function can be turned ON and OFF. Once OFF, the host is not expected to issue a flush-cache command to the device. Avri Altman (2): mmc: block: Issue flush only if allowed mmc: block: Update ext_csd.cache_ctrl if it was written drivers/mmc/core/block.c | 19 +++++++++++++++++++ drivers/mmc/core/mmc.c | 2 +- drivers/mmc/core/mmc_ops.h | 5 +++++ 3 files changed, 25 insertions(+), 1 deletion(-)