From patchwork Mon Sep 18 16:55:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bart Van Assche X-Patchwork-Id: 13390155 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9D562CD13D2 for ; Mon, 18 Sep 2023 16:59:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231276AbjIRQ7X (ORCPT ); Mon, 18 Sep 2023 12:59:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42100 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231302AbjIRQ7E (ORCPT ); Mon, 18 Sep 2023 12:59:04 -0400 Received: from mail-ot1-f45.google.com (mail-ot1-f45.google.com [209.85.210.45]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 789B1D6; Mon, 18 Sep 2023 09:58:58 -0700 (PDT) Received: by mail-ot1-f45.google.com with SMTP id 46e09a7af769-6c09d760cb9so2987230a34.2; Mon, 18 Sep 2023 09:58:58 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1695056337; x=1695661137; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=c2vSWbaA+nCLUUjiKCgMRYyAM+te1fbrLUvs69miu8E=; b=ZIN82FFPRXwmZWItQy9hrq/dKPpvgkT+jj5spjRdNUGvmRzGSvsopE49gztUMnyzG0 8fmKeq0clZx7FFRSoHueYVcC9FijOyFcmanD1rVDRcnQf0utYLyrwApsjIeh3b9Itd1D 7CSGJE1zAM6pvKPIIk+uuqGRaFdRygSUG55fb7omrMRSZrSRH9z4SEmw8Lumbj6hrQBv vupjkpOoCy0ng63dPHAsB+7Un2dsxwrDnCzc8xDqmz2N2VQqV1K06zpWnqTEQ5nPgwgN pppaPLu2h7MCrb2n/lwJaJk2AlKpYJGzoPv9wahSwVjMonsjcjiKzyqFz6SG0X3R+5No 3V+A== X-Gm-Message-State: AOJu0YyfxEvvdqYY1/IMOicR0p9zMugvEG87lDz86YrjpwIw6RCFSkC8 nj+MQwt6D6ZWowg7fDmTzqk= X-Google-Smtp-Source: AGHT+IG4URXfcIqkbSx26sXGDXlYhciwz8A/HnsSEcJWncmVnDZkai+9m5s063BMwCnXKi/9pZ2M2A== X-Received: by 2002:a05:6830:100c:b0:6b9:4216:c209 with SMTP id a12-20020a056830100c00b006b94216c209mr8614005otp.12.1695056337589; Mon, 18 Sep 2023 09:58:57 -0700 (PDT) Received: from bvanassche-linux.mtv.corp.google.com ([2620:15c:211:201:33e7:1437:5d00:8e3b]) by smtp.gmail.com with ESMTPSA id p17-20020a639511000000b005740aa41237sm5658041pgd.74.2023.09.18.09.58.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Sep 2023 09:58:57 -0700 (PDT) From: Bart Van Assche To: Jens Axboe Cc: linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, "Martin K . Petersen" , Christoph Hellwig , Bart Van Assche , "Bao D . Nguyen" , Can Guo , Avri Altman , "James E.J. Bottomley" , Stanley Chu , Bean Huo , Asutosh Das , Arthur Simchaev Subject: [PATCH v12 15/16] scsi: ufs: Forbid auto-hibernation without I/O scheduler Date: Mon, 18 Sep 2023 09:55:54 -0700 Message-ID: <20230918165713.1598705-16-bvanassche@acm.org> X-Mailer: git-send-email 2.42.0.459.ge4e396fd5e-goog In-Reply-To: <20230918165713.1598705-1-bvanassche@acm.org> References: <20230918165713.1598705-1-bvanassche@acm.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org UFSHCI controllers in legacy mode do not preserve the write order if auto-hibernation is enabled. If the write order is not preserved, an I/O scheduler is required to serialize zoned writes. Hence do not allow auto-hibernation to be enabled without I/O scheduler if a zoned logical unit is present and if the controller is operating in legacy mode. This patch has been tested with the following shell script: show_ah8() { echo -n "auto_hibern8: " adb shell "cat /sys/devices/platform/13200000.ufs/auto_hibern8" } set_ah8() { local rc adb shell "echo $1 > /sys/devices/platform/13200000.ufs/auto_hibern8" rc=$? show_ah8 return $rc } set_iosched() { adb shell "echo $1 >/sys/class/block/$zoned_bdev/queue/scheduler && echo -n 'I/O scheduler: ' && cat /sys/class/block/sde/queue/scheduler" } adb root zoned_bdev=$(adb shell grep -lvw 0 /sys/class/block/sd*/queue/chunk_sectors |& sed 's|/sys/class/block/||g;s|/queue/chunk_sectors||g') [ -n "$zoned_bdev" ] show_ah8 set_ah8 0 set_iosched none if set_ah8 150000; then echo "Error: enabled AH8 without I/O scheduler" fi set_iosched mq-deadline set_ah8 150000 Reviewed-by: Bao D. Nguyen Reviewed-by: Can Guo Cc: Martin K. Petersen Cc: Avri Altman Signed-off-by: Bart Van Assche --- drivers/ufs/core/ufshcd.c | 60 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index d98c639a76a3..c6823435442e 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -4304,6 +4304,30 @@ int ufshcd_uic_hibern8_exit(struct ufs_hba *hba) } EXPORT_SYMBOL_GPL(ufshcd_uic_hibern8_exit); +static int ufshcd_update_preserves_write_order(struct ufs_hba *hba, + bool preserves_write_order) +{ + struct scsi_device *sdev; + + if (!preserves_write_order) { + shost_for_each_device(sdev, hba->host) { + struct request_queue *q = sdev->request_queue; + + /* + * Refuse to enable auto-hibernation if no I/O scheduler + * is present. This code does not check whether the + * attached I/O scheduler serializes zoned writes + * (ELEVATOR_F_ZBD_SEQ_WRITE) because this cannot be + * checked from outside the block layer core. + */ + if (blk_queue_is_zoned(q) && !q->elevator) + return -EPERM; + } + } + + return 0; +} + static void ufshcd_configure_auto_hibern8(struct ufs_hba *hba) { if (!ufshcd_is_auto_hibern8_supported(hba)) @@ -4312,13 +4336,42 @@ static void ufshcd_configure_auto_hibern8(struct ufs_hba *hba) ufshcd_writel(hba, hba->ahit, REG_AUTO_HIBERNATE_IDLE_TIMER); } +/** + * ufshcd_auto_hibern8_update() - Modify the auto-hibernation control register + * @hba: per-adapter instance + * @ahit: New auto-hibernate settings. Includes the scale and the value of the + * auto-hibernation timer. See also the UFSHCI_AHIBERN8_TIMER_MASK and + * UFSHCI_AHIBERN8_SCALE_MASK constants. + * + * Notes: + * - UFSHCI controllers do not preserve the command order in legacy mode + * if auto-hibernation is enabled. If the command order is not preserved, an + * I/O scheduler that serializes zoned writes (mq-deadline) is required if a + * zoned logical unit is present. Enabling auto-hibernation without attaching + * the mq-deadline scheduler first may cause unaligned write errors for the + * zoned logical unit if a zoned logical unit is present. + * - Calls of this function must be serialized. + */ int ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit) { const u32 cur_ahit = READ_ONCE(hba->ahit); + bool prev_state, new_state; + int ret; if (!ufshcd_is_auto_hibern8_supported(hba) || cur_ahit == ahit) return 0; + prev_state = FIELD_GET(UFSHCI_AHIBERN8_TIMER_MASK, cur_ahit); + new_state = FIELD_GET(UFSHCI_AHIBERN8_TIMER_MASK, ahit); + + if (!is_mcq_enabled(hba) && !prev_state && new_state) { + /* + * Auto-hibernation will be enabled for legacy UFSHCI mode. + */ + ret = ufshcd_update_preserves_write_order(hba, false); + if (ret) + return ret; + } WRITE_ONCE(hba->ahit, ahit); if (!pm_runtime_suspended(&hba->ufs_device_wlun->sdev_gendev)) { ufshcd_rpm_get_sync(hba); @@ -4327,6 +4380,13 @@ int ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit) ufshcd_release(hba); ufshcd_rpm_put_sync(hba); } + if (!is_mcq_enabled(hba) && prev_state && !new_state) { + /* + * Auto-hibernation has been disabled. + */ + ret = ufshcd_update_preserves_write_order(hba, true); + WARN_ON_ONCE(ret); + } return 0; }