From patchwork Tue Sep 1 04:31:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daejun Park X-Patchwork-Id: 11747473 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 75623161F for ; Tue, 1 Sep 2020 06:53:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 55CA6208DB for ; Tue, 1 Sep 2020 06:53:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b="lJ1lfp7V" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726933AbgIAGxG (ORCPT ); Tue, 1 Sep 2020 02:53:06 -0400 Received: from mailout2.samsung.com ([203.254.224.25]:22583 "EHLO mailout2.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726892AbgIAGxE (ORCPT ); Tue, 1 Sep 2020 02:53:04 -0400 Received: from epcas1p2.samsung.com (unknown [182.195.41.46]) by mailout2.samsung.com (KnoxPortal) with ESMTP id 20200901065302epoutp02a9c7db6f13409bfa4a94a4eba3db3ce6~wllpGg18C0714707147epoutp02Z for ; Tue, 1 Sep 2020 06:53:02 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout2.samsung.com 20200901065302epoutp02a9c7db6f13409bfa4a94a4eba3db3ce6~wllpGg18C0714707147epoutp02Z DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1598943182; bh=0RqILSjSluQTcp7A9cjKSqQAf2l2HI407ixivTHWcYQ=; h=Subject:Reply-To:From:To:CC:Date:References:From; b=lJ1lfp7VsLNvtClJJrW/f9/5SSDxlY9L4e/Os7ULuidmOGfytLjYeYDu7mWYkrf09 lxfzCZjsckGbV8cPc5mc1f/ErU/7VWb1I5cnbjnPLiQklqlWvl/H/dRac93Jb7oYlS XqEYi/BD79ylhAXhnbzsGru5B/VVCY12N/HgwEAs= Received: from epcpadp2 (unknown [182.195.40.12]) by epcas1p4.samsung.com (KnoxPortal) with ESMTP id 20200901065301epcas1p406b00849d5bdf061d3537cb1d964072c~wllomjVQG0503605036epcas1p4p; Tue, 1 Sep 2020 06:53:01 +0000 (GMT) Mime-Version: 1.0 Subject: [PATCH v10 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 , SEUNGUK 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: <231786897.01598943181634.JavaMail.epsvc@epcpadp2> Date: Tue, 01 Sep 2020 13:31:52 +0900 X-CMS-MailID: 20200901043152epcms2p55ba1891c12bd8002dff38a1214aace72 X-Sendblock-Type: AUTO_CONFIDENTIAL X-CPGSPASS: Y X-CPGSPASS: Y X-Hop-Count: 3 X-CMS-RootMailID: 20200901043152epcms2p55ba1891c12bd8002dff38a1214aace72 References: Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Changelog: v9 -> v10 1. Fix 64-bit division error 2. Fix problems commentted in Bart's review. v8 -> v9 1. Change sysfs initialization. 2. Change reading descriptor during HPB initialization 3. Fix problems commentted in Bart's review. 4. Change base commit from 5.9/scsi-queue to 5.10/scsi-queue. 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 HPB feature related parameters 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 | 9 + drivers/scsi/ufs/Makefile | 1 + drivers/scsi/ufs/ufs.h | 47 + drivers/scsi/ufs/ufshcd.c | 60 ++ drivers/scsi/ufs/ufshcd.h | 23 +- drivers/scsi/ufs/ufshpb.c | 1845 ++++++++++++++++++++++++++++++++++++++++ drivers/scsi/ufs/ufshpb.h | 229 +++++ 7 files changed, 2213 insertions(+), 1 deletion(-) created mode 100644 drivers/scsi/ufs/ufshpb.c created mode 100644 drivers/scsi/ufs/ufshpb.h