From patchwork Thu Aug 6 07:32:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daejun Park X-Patchwork-Id: 11702841 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 A28BB138A for ; Thu, 6 Aug 2020 11:04:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6EB9122CAE for ; Thu, 6 Aug 2020 11:04:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b="JKMC/oac" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728973AbgHFI6I (ORCPT ); Thu, 6 Aug 2020 04:58:08 -0400 Received: from mailout3.samsung.com ([203.254.224.33]:46246 "EHLO mailout3.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725927AbgHFI6G (ORCPT ); Thu, 6 Aug 2020 04:58:06 -0400 Received: from epcas1p3.samsung.com (unknown [182.195.41.47]) by mailout3.samsung.com (KnoxPortal) with ESMTP id 20200806085802epoutp03abbdc184ac8e47aa55fbc631632c6c08~oohW_x1DQ2255622556epoutp03G for ; Thu, 6 Aug 2020 08:58:02 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout3.samsung.com 20200806085802epoutp03abbdc184ac8e47aa55fbc631632c6c08~oohW_x1DQ2255622556epoutp03G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1596704282; bh=xzBtohQMolPYLu+HF6qIVaI9vjI8Vh5DyEiki5Cz6gk=; h=Subject:Reply-To:From:To:CC:Date:References:From; b=JKMC/oacLjCArCL2K6l+rKcgQjI8oyoqBMhLtqntrvkEQM7+MGwrhhNKBj4G4Awzg eF40AduBDvtC/zZQlH/RGwWE/qZBBQrgW+NTcOzA0bEBRP61gifdu46F1r4YZpzL4i c5TA5sy+33Gu8ROq695/NM2qQVIKLUYt3k/G8ZCU= Received: from epcpadp2 (unknown [182.195.40.12]) by epcas1p2.samsung.com (KnoxPortal) with ESMTP id 20200806085801epcas1p2e0877043b40df7bb3c8e683cc07f4c5c~oohWluq2N2479624796epcas1p2L; Thu, 6 Aug 2020 08:58:01 +0000 (GMT) Mime-Version: 1.0 Subject: [PATCH v8 0/4] 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" , 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: <231786897.01596704281715.JavaMail.epsvc@epcpadp2> Date: Thu, 06 Aug 2020 16:32:57 +0900 X-CMS-MailID: 20200806073257epcms2p61564ed62e02fc42fc3c2b18fa92a038d X-Sendblock-Type: AUTO_CONFIDENTIAL X-CPGSPASS: Y X-CPGSPASS: Y X-Hop-Count: 3 X-CMS-RootMailID: 20200806073257epcms2p61564ed62e02fc42fc3c2b18fa92a038d References: Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Changelog: v7 -> v8 Remove wrongly added tags. v6 -> v7 1. Remove UFS feature layer. 2. Cleanup for sparse error. v5 -> v6 Change base commit to b53293fa662e28ae0cdd40828dc641c09f133405 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 3 parts to support HPB feature. 1) HPB probe and initialization process 2) READ -> HPB READ using cached map information 3) L2P (logical to physical) map management 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. The HPB manages the L2P map using information received from the device. For active sub-region, the HPB caches through ufshpb_map request. For the in-active region, the HPB 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 (4): scsi: ufs: Add UFS feature related parameter scsi: ufs: Introduce HPB feature scsi: ufs: L2P map management for HPB read scsi: ufs: Prepare HPB read for cached sub-region drivers/scsi/ufs/Kconfig | 18 + drivers/scsi/ufs/Makefile | 1 + drivers/scsi/ufs/ufs.h | 12 + drivers/scsi/ufs/ufshcd.c | 42 + drivers/scsi/ufs/ufshcd.h | 9 + drivers/scsi/ufs/ufshpb.c | 1926 ++++++++++++++++++++++++++++++++++++++++ drivers/scsi/ufs/ufshpb.h | 241 +++++ 7 files changed, 2249 insertions(+) created mode 100644 drivers/scsi/ufs/ufshpb.c created mode 100644 drivers/scsi/ufs/ufshpb.h