From patchwork Thu Jul 2 23:19:36 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daejun Park X-Patchwork-Id: 11640481 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 31FAE14B7 for ; Thu, 2 Jul 2020 23:23:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 11E2620760 for ; Thu, 2 Jul 2020 23:23:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b="uhmKUJq6" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726110AbgGBXXH (ORCPT ); Thu, 2 Jul 2020 19:23:07 -0400 Received: from mailout2.samsung.com ([203.254.224.25]:34216 "EHLO mailout2.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726017AbgGBXXG (ORCPT ); Thu, 2 Jul 2020 19:23:06 -0400 Received: from epcas1p1.samsung.com (unknown [182.195.41.45]) by mailout2.samsung.com (KnoxPortal) with ESMTP id 20200702232302epoutp0267e72e2be0ebdaf7c2dac06a61aef08c~eEvn5-E511656016560epoutp02o for ; Thu, 2 Jul 2020 23:23:02 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout2.samsung.com 20200702232302epoutp0267e72e2be0ebdaf7c2dac06a61aef08c~eEvn5-E511656016560epoutp02o DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1593732183; bh=vVLhM6keqMkvnnQN9F7HdB67Qm+8dc8wm48wNbovVjc=; h=Subject:Reply-To:From:To:CC:Date:References:From; b=uhmKUJq6ki8P5e46P0Y7ss77Rl9fCpmUBliiLQ2b7B5yeKsQwZaUlFwkWz8VbHLlX YQ+wD5p+mOmVcjUhsmE/vk818RyU5KQw127THrEr5beJCnc5AdFlbTavsJC/9tyA/p ExU8Hik7brQDpOkTYbMLKDXziwS4uHYnTkXQM99Y= Received: from epcpadp2 (unknown [182.195.40.12]) by epcas1p4.samsung.com (KnoxPortal) with ESMTP id 20200702232302epcas1p4bddf408dd755e36775befbc15f601fba~eEvnfr1513222532225epcas1p4R; Thu, 2 Jul 2020 23:23:02 +0000 (GMT) Mime-Version: 1.0 Subject: [PATCH v5 0/5] scsi: ufs: Add Host Performance Booster Support Reply-To: daejun7.park@samsung.com From: Daejun Park To: "avri.altman@wdc.com" , "jejb@linux.ibm.com" , "martin.petersen@oracle.com" , "asutoshd@codeaurora.org" , "beanhuo@micron.com" , "stanley.chu@mediatek.com" , "cang@codeaurora.org" , "bvanassche@acm.org" , "tomas.winkler@intel.com" , Daejun Park CC: "linux-scsi@vger.kernel.org" , "linux-kernel@vger.kernel.org" , ALIM AKHTAR , Sang-yoon Oh , Sung-Jun Park , yongmyung lee , Jinyoung CHOI , Adel Choi , BoRam Shin X-Priority: 3 X-Content-Kind-Code: NORMAL X-CPGS-Detection: blocking_info_exchange X-Drm-Type: N,general X-Msg-Generator: Mail X-Msg-Type: PERSONAL X-Reply-Demand: N Message-ID: <963815509.21593732182531.JavaMail.epsvc@epcpadp2> Date: Fri, 03 Jul 2020 08:19:36 +0900 X-CMS-MailID: 20200702231936epcms2p81557f83504ef1c1e81bfc81a0143a5b4 X-Sendblock-Type: AUTO_CONFIDENTIAL X-CPGSPASS: Y X-CPGSPASS: Y X-Hop-Count: 3 X-CMS-RootMailID: 20200702231936epcms2p81557f83504ef1c1e81bfc81a0143a5b4 References: Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Changelog: v4 -> v5 Delete unused macro define. v3 -> v4 1. Cleanup. v2 -> v3 1. Add checking input module parameter value. 2. Change base commit from 5.8/scsi-queue to 5.9/scsi-queue. 3. Cleanup for unused variables and label. v1 -> v2 1. Change the full boilerplate text to SPDX style. 2. Adopt dynamic allocation for sub-region data structure. 3. Cleanup. NAND flash memory-based storage devices use Flash Translation Layer (FTL) to translate logical addresses of I/O requests to corresponding flash memory addresses. Mobile storage devices typically have RAM with constrained size, thus lack in memory to keep the whole mapping table. Therefore, mapping tables are partially retrieved from NAND flash on demand, causing random-read performance degradation. To improve random read performance, JESD220-3 (HPB v1.0) proposes HPB (Host Performance Booster) which uses host system memory as a cache for the FTL mapping table. By using HPB, FTL data can be read from host memory faster than from NAND flash memory. The current version only supports the DCM (device control mode). This patch consists of 4 parts to support HPB feature. 1) UFS-feature layer 2) HPB probe and initialization process 3) READ -> HPB READ using cached map information 4) L2P (logical to physical) map management The UFS-feature is an additional layer to avoid the structure in which the UFS-core driver and the UFS-feature are entangled with each other in a single module. By adding the layer, UFS-features composed of various combinations can be supported. Also, even if a new feature is added, modification of the UFS-core driver can be minimized. In the HPB probe and init process, the device information of the UFS is queried. After checking supported features, the data structure for the HPB is initialized according to the device information. A read I/O in the active sub-region where the map is cached is changed to HPB READ by the HPB module. The HPB module manages the L2P map using information received from the device. For active sub-region, the HPB module caches through ufshpb_map request. For the in-active region, the HPB module discards the L2P map. When a write I/O occurs in an active sub-region area, associated dirty bitmap checked as dirty for preventing stale read. HPB is shown to have a performance improvement of 58 - 67% for random read workload. [1] This series patches are based on the 5.9/scsi-queue branch. [1]: https://www.usenix.org/conference/hotstorage17/program/presentation/jeong Daejun park (5): scsi: ufs: Add UFS feature related parameter scsi: ufs: Add UFS feature layer scsi: ufs: Introduce HPB module scsi: ufs: L2P map management for HPB read scsi: ufs: Prepare HPB read for cached sub-region drivers/scsi/ufs/Kconfig | 9 + drivers/scsi/ufs/Makefile | 3 +- drivers/scsi/ufs/ufs.h | 12 + drivers/scsi/ufs/ufsfeature.c | 148 +++ drivers/scsi/ufs/ufsfeature.h | 69 ++ drivers/scsi/ufs/ufshcd.c | 19 + drivers/scsi/ufs/ufshcd.h | 3 + drivers/scsi/ufs/ufshpb.c | 1997 ++++++++++++++++++++++++++++++++++++ drivers/scsi/ufs/ufshpb.h | 234 +++++ 9 files changed, 2493 insertions(+), 1 deletion(-) created mode 100644 drivers/scsi/ufs/ufsfeature.c created mode 100644 drivers/scsi/ufs/ufsfeature.h created mode 100644 drivers/scsi/ufs/ufshpb.c created mode 100644 drivers/scsi/ufs/ufshpb.h Tested-by: Bean Huo