From patchwork Tue Jun 23 01:02:01 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daejun Park X-Patchwork-Id: 11619605 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 A23AD6C1 for ; Tue, 23 Jun 2020 02:33:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8AB1F20771 for ; Tue, 23 Jun 2020 02:33:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b="GKXzwbNd" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731584AbgFWCdJ (ORCPT ); Mon, 22 Jun 2020 22:33:09 -0400 Received: from mailout1.samsung.com ([203.254.224.24]:21130 "EHLO mailout1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731312AbgFWCdG (ORCPT ); Mon, 22 Jun 2020 22:33:06 -0400 Received: from epcas1p3.samsung.com (unknown [182.195.41.47]) by mailout1.samsung.com (KnoxPortal) with ESMTP id 20200623023302epoutp01e255ea2daa839add8e3e0323641d1663~bC4qG4vwN1199111991epoutp01B for ; Tue, 23 Jun 2020 02:33:02 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout1.samsung.com 20200623023302epoutp01e255ea2daa839add8e3e0323641d1663~bC4qG4vwN1199111991epoutp01B DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1592879582; bh=wKCmCJOcOvwgA68zVgbhHfs3xn5oNSf6Uwxw2j9YDPQ=; h=Subject:Reply-To:From:To:CC:Date:References:From; b=GKXzwbNdXsXqf+yg/o2sXg4iD3q58G4KF7usrZiX/DZYaMjsAKoiLzyrSj6B/LM/4 j3vALOZFJE4wjYEGonKkEprIDxCgu1P45+Nxr6OBa+62R5zY0JwbZbrja9S6ry6DJH A6RwNcji1XFms3LMtzVtZRuCacwv4krdeheh9Md8= Received: from epcpadp2 (unknown [182.195.40.12]) by epcas1p1.samsung.com (KnoxPortal) with ESMTP id 20200623023302epcas1p1dda6a02ca3beff6db6154444822c0f04~bC4pdmYlc1583215832epcas1p1Q; Tue, 23 Jun 2020 02:33:02 +0000 (GMT) Mime-Version: 1.0 Subject: [RFC PATCH v3 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" , "stanley.chu@mediatek.com" , "cang@codeaurora.org" , "huobean@gmail.com" , "bvanassche@acm.org" , "tomas.winkler@intel.com" , ALIM AKHTAR , Daejun Park CC: "linux-scsi@vger.kernel.org" , "linux-kernel@vger.kernel.org" , 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: <963815509.21592879582091.JavaMail.epsvc@epcpadp2> Date: Tue, 23 Jun 2020 10:02:01 +0900 X-CMS-MailID: 20200623010201epcms2p11aebdf1fbc719b409968cba997507114 X-Sendblock-Type: AUTO_CONFIDENTIAL X-CPGSPASS: Y X-CPGSPASS: Y X-Hop-Count: 3 X-CMS-RootMailID: 20200623010201epcms2p11aebdf1fbc719b409968cba997507114 References: Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Changelog: 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 | 23 +- drivers/scsi/ufs/ufshcd.h | 3 + drivers/scsi/ufs/ufshpb.c | 1996 ++++++++++++++++++++++++++++++++++++ drivers/scsi/ufs/ufshpb.h | 234 +++++ 9 files changed, 2494 insertions(+), 3 deletions(-) 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