From patchwork Wed Feb 5 12:50:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baolin Wang X-Patchwork-Id: 11366241 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 644AC1395 for ; Wed, 5 Feb 2020 12:51:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 38D4D20702 for ; Wed, 5 Feb 2020 12:51:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="U9cdohrc" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726961AbgBEMvT (ORCPT ); Wed, 5 Feb 2020 07:51:19 -0500 Received: from mail-pl1-f193.google.com ([209.85.214.193]:37053 "EHLO mail-pl1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726308AbgBEMvT (ORCPT ); Wed, 5 Feb 2020 07:51:19 -0500 Received: by mail-pl1-f193.google.com with SMTP id c23so854247plz.4; Wed, 05 Feb 2020 04:51:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=PXFvkiGRXuDhiJvcYc/Jk/zrUgQKIy7nBUfvFcGoJRk=; b=U9cdohrchImToTte6UIkVqRPyXjcmnCaDPkha+8rOGhUm2FlVecoLDxszkQhdUDlun BwtaKxndX+TbOMjEEmRNmKazySg4cl79JRjZybXu3FfeBM+Wyg/uqiGDEO2x9bCygMzM VvEfvqKRYBS7iWT5JzdV5DC4h7ZWjvwYaOQX7ypsCtWWnd1x8K/DADdftT2MfDSOxIGX gaYhkOTN3ECbLKyo3AagzoY90wqcQJZY9dYS3jzAAdGmNnP2vrA8M3zmhz1HgdYfg8hY SDf0hXSkZMy+vF2x3YvQvdsvi+QkBkSq437f2K3C5yS92Fl8vTdycE0RkvIeLPjCC6hD bJeA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=PXFvkiGRXuDhiJvcYc/Jk/zrUgQKIy7nBUfvFcGoJRk=; b=Uqfsti/Oj6ShfcZ7gptmTdG3XCpM2/aIEPoI3O4T/9KZVsnaQQu2CTn9hcdekwadGJ yCRPtWccCnF4JAxdsH4Atluv888bvrFPOULaldEjcu8oeP0YQ2DzyAJREFbM/TWWk3Yf PddW+2SD6kRm9CC1KokIJax/7/NH8oA+IC0nqk4K45mRMjfqn7QMUOeAEEqAeYIK7Ovn QhGoWhp9LC9sbGkWAa/Siw6SBjbDWs3dA2iBPvKtWAHbJVp6Iea6py04o2TpCy74oXvj FkBDHwa9QJuHvff6zyMFz9/b968g0wOhAwb07Xr2xqGDEZmx1mN+c1BSW0kpeF6bQtcs jIdw== X-Gm-Message-State: APjAAAUEzphnZK3b10ZuOvBLSq3yzedV3+v9RlsFOYjQaveiysJFGWtD 1t+Jj1A8ASn2Q0wxopYkodo= X-Google-Smtp-Source: APXvYqz4sd6fi573XbT5NcaZW+Sb0tSHSKJq5m6qBTIez9iu5vjhwO183Uck3jZcDScGo6lYpsQa1Q== X-Received: by 2002:a17:902:bb83:: with SMTP id m3mr35458452pls.258.1580907078376; Wed, 05 Feb 2020 04:51:18 -0800 (PST) Received: from baolinwangubtpc.spreadtrum.com ([117.18.48.82]) by smtp.gmail.com with ESMTPSA id y127sm22864784pfg.22.2020.02.05.04.51.15 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 05 Feb 2020 04:51:17 -0800 (PST) From: Baolin Wang To: adrian.hunter@intel.com, ulf.hansson@linaro.org, asutoshd@codeaurora.org Cc: orsonzhai@gmail.com, zhang.lyra@gmail.com, arnd@arndb.de, linus.walleij@linaro.org, baolin.wang@linaro.org, baolin.wang7@gmail.com, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v8 0/5] Add MMC software queue support Date: Wed, 5 Feb 2020 20:50:27 +0800 Message-Id: X-Mailer: git-send-email 1.7.9.5 Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org Hi All, Now the MMC read/write stack will always wait for previous request is completed by mmc_blk_rw_wait(), before sending a new request to hardware, or queue a work to complete request, that will bring context switching overhead, especially for high I/O per second rates, to affect the IO performance. Thus this patch set will introduce the MMC software command queue support based on command queue engine's interfaces, and set the queue depth as 64 to allow more requests can be be prepared, merged and inserted into IO scheduler, but we only allow 2 requests in flight, that is enough to let the irq handler always trigger the next request without a context switch, as well as avoiding a long latency. Moreover we can expand the MMC software queue interface to support MMC packed request or packed command instead of adding new interfaces, according to previosus discussion. Below are some comparison data with fio tool. The fio command I used is like below with changing the '--rw' parameter and enabling the direct IO flag to measure the actual hardware transfer speed in 4K block size. ./fio --filename=/dev/mmcblk0p30 --direct=1 --iodepth=20 --rw=read --bs=4K --size=1G --group_reporting --numjobs=20 --name=test_read My eMMC card working at HS400 Enhanced strobe mode: [ 2.229856] mmc0: new HS400 Enhanced strobe MMC card at address 0001 [ 2.237566] mmcblk0: mmc0:0001 HBG4a2 29.1 GiB [ 2.242621] mmcblk0boot0: mmc0:0001 HBG4a2 partition 1 4.00 MiB [ 2.249110] mmcblk0boot1: mmc0:0001 HBG4a2 partition 2 4.00 MiB [ 2.255307] mmcblk0rpmb: mmc0:0001 HBG4a2 partition 3 4.00 MiB, chardev (248:0) 1. Without MMC software queue I tested 5 times for each case and output a average speed. 1) Sequential read: Speed: 59.4MiB/s, 63.4MiB/s, 57.5MiB/s, 57.2MiB/s, 60.8MiB/s Average speed: 59.66MiB/s 2) Random read: Speed: 26.9MiB/s, 26.9MiB/s, 27.1MiB/s, 27.1MiB/s, 27.2MiB/s Average speed: 27.04MiB/s 3) Sequential write: Speed: 71.6MiB/s, 72.5MiB/s, 72.2MiB/s, 64.6MiB/s, 67.5MiB/s Average speed: 69.68MiB/s 4) Random write: Speed: 36.3MiB/s, 35.4MiB/s, 38.6MiB/s, 34MiB/s, 35.5MiB/s Average speed: 35.96MiB/s 2. With MMC software queue I tested 5 times for each case and output a average speed. 1) Sequential read: Speed: 59.2MiB/s, 60.4MiB/s, 63.6MiB/s, 60.3MiB/s, 59.9MiB/s Average speed: 60.68MiB/s 2) Random read: Speed: 31.3MiB/s, 31.4MiB/s, 31.5MiB/s, 31.3MiB/s, 31.3MiB/s Average speed: 31.36MiB/s 3) Sequential write: Speed: 71MiB/s, 71.8MiB/s, 72.3MiB/s, 72.2MiB/s, 71MiB/s Average speed: 71.66MiB/s 4) Random write: Speed: 68.9MiB/s, 68.7MiB/s, 68.8MiB/s, 68.6MiB/s, 68.8MiB/s Average speed: 68.76MiB/s Form above data, we can see the MMC software queue can help to improve some performance obviously for random read and write, though no obvious improvement for sequential read and write. Any comments are welcome. Thanks a lot. Changes from v7: - Add reviewed tag from Arnd. - Use the 'hsq' acronym for varibles and functions in the core layer. - Check the 'card->ext_csd.cmdq_en' in cqhci.c to make sure the CQE can work normally. - Add a new patch to enable the host software queue for the SD card. - Use the default MMC queue depth for host software queue. Changes from v6: - Change the patch order and set host->always_defer_done = true for the Spreadtrum host driver. Changes from v5: - Modify the condition of defering to complete request suggested by Adrian. Changes from v4: - Add a seperate patch to introduce a variable to defer to complete data requests for some host drivers, when using host software queue. Changes from v3: - Use host software queue instead of sqhci. - Fix random config building issue. - Change queue depth to 32, but still only allow 2 requests in flight. - Update the testing data. Changes from v2: - Remove reference to 'struct cqhci_host' and 'struct cqhci_slot', instead adding 'struct sqhci_host', which is only used by software queue. Changes from v1: - Add request_done ops for sdhci_ops. - Replace virtual command queue with software queue for functions and variables. - Rename the software queue file and add sqhci.h header file. Baolin Wang (5): mmc: Add MMC host software queue support mmc: core: Enable the MMC host software queue for the SD card mmc: host: sdhci: Add request_done ops for struct sdhci_ops mmc: host: sdhci: Add a variable to defer to complete requests if needed mmc: host: sdhci-sprd: Add software queue support drivers/mmc/core/block.c | 61 ++++++++ drivers/mmc/core/mmc.c | 13 +- drivers/mmc/core/queue.c | 22 ++- drivers/mmc/core/sd.c | 10 ++ drivers/mmc/host/Kconfig | 8 + drivers/mmc/host/Makefile | 1 + drivers/mmc/host/cqhci.c | 3 + drivers/mmc/host/mmc_hsq.c | 343 +++++++++++++++++++++++++++++++++++++++++ drivers/mmc/host/mmc_hsq.h | 30 ++++ drivers/mmc/host/sdhci-sprd.c | 28 ++++ drivers/mmc/host/sdhci.c | 14 +- drivers/mmc/host/sdhci.h | 3 + include/linux/mmc/host.h | 3 + 13 files changed, 529 insertions(+), 10 deletions(-) create mode 100644 drivers/mmc/host/mmc_hsq.c create mode 100644 drivers/mmc/host/mmc_hsq.h