From nobody Wed Sep 17 10:35:59 2025 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 F08ECC4332F for ; Thu, 22 Dec 2022 15:22:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235683AbiLVPWi (ORCPT ); Thu, 22 Dec 2022 10:22:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37400 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235525AbiLVPWN (ORCPT ); Thu, 22 Dec 2022 10:22:13 -0500 Received: from mail-ej1-x634.google.com (mail-ej1-x634.google.com [IPv6:2a00:1450:4864:20::634]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C680C2B255 for ; Thu, 22 Dec 2022 07:22:10 -0800 (PST) Received: by mail-ej1-x634.google.com with SMTP id m18so5668304eji.5 for ; Thu, 22 Dec 2022 07:22:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=Bhr5qDaT2JKIRy4QvSZClVOncStleytag0NJgoail6A=; b=ePqAcSTv4XFlYItKTMjsdafeWPV1Hl+RIsok1DKy20O+kji7kTZb1NLBcjy8LSb5GO DKVimmhqpbvQvpGX3lkLIcV5qEzhTN+gHlzlVBYTRtwcP4XiiWXeG6OxUO8L6GC5CRjI KXSUPKuyEeqtb7mtcqdXGyalgJiLm3TULo5K6Eu/CX+Jb65fdcRb6YalpGGvyCOX+3km osFRw39wFQnsEu6dv4CBaXwNeRRTtG3Zdy3azOPmX8GjJtg3kdPGAaDByIvcuBetEfzE X/osZqdwjxHbrFjOv4285WvB4hSevd8RHOcvEKmBHli9hHeY3CS26iqJKjryyjcYY1X3 DNxA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; 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=Bhr5qDaT2JKIRy4QvSZClVOncStleytag0NJgoail6A=; b=78dD290lGwrkucI98RS+kS78dJ6+zlSt1xYmZUInMgTl9vAXjGapXCNJBnTi+lPBGD nJvM8cK/awgJaqNeWH65oUGrPlnRYeP8V5wCEkZOoH8+sHmWx6LuhrSGduDFjgYzAi8j pQxO0nLSxXHFjnITIlFKkTvoOGeEvK6b90HGcHNawWMSmBVG16EqjSIR/dzHj1taWdLk +cSwN7YN9FCeMo0wgd0akbd+Az6yj1Ug3OHa3QFBZxlAYHEs1rOBIlrShT+pSSbh7xCz HQjqKBZiJ1r98bAqJIBsFBUDjCASz2TPpvBuI5/L1ebuJytd2a54Bwox53Uv4NwxjOG6 FFGQ== X-Gm-Message-State: AFqh2kqDtdPhzfhy3gUdbWP0z5/k5+UO4/2tjbokqwDTpPjj/LLjeze2 E920ok3c0GBvOlIHqAjf5yZfPg== X-Google-Smtp-Source: AMrXdXtbgI4HP9ON1BOA05QZAkYnwABg7Urk8RYFc/CPmTwTPH+kKnb/ofkilCaMyH68fi7bo6a7Xw== X-Received: by 2002:a17:906:700f:b0:7c1:6bd9:571e with SMTP id n15-20020a170906700f00b007c16bd9571emr4149992ejj.13.1671722530401; Thu, 22 Dec 2022 07:22:10 -0800 (PST) Received: from MBP-di-Paolo.station (net-93-70-85-0.cust.vodafonedsl.it. [93.70.85.0]) by smtp.gmail.com with ESMTPSA id 17-20020a170906201100b007c08439161dsm355670ejo.50.2022.12.22.07.22.09 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 22 Dec 2022 07:22:10 -0800 (PST) From: Paolo Valente To: Jens Axboe Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, arie.vanderhoeven@seagate.com, rory.c.chen@seagate.com, glen.valante@linaro.org, damien.lemoal@opensource.wdc.com, Federico Gavioli , Paolo Valente Subject: [PATCH V12 6/8] block, bfq: retrieve independent access ranges from request queue Date: Thu, 22 Dec 2022 16:21:55 +0100 Message-Id: <20221222152157.61789-7-paolo.valente@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20221222152157.61789-1-paolo.valente@linaro.org> References: <20221222152157.61789-1-paolo.valente@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Federico Gavioli This patch implements the code to gather the content of the independent_access_ranges structure from the request_queue and copy it into the queue's bfq_data. This copy is done at queue initialization. We copy the access ranges into the bfq_data to avoid taking the queue lock each time we access the ranges. This implementation, however, puts a limit to the maximum independent ranges supported by the scheduler. Such a limit is equal to the constant BFQ_MAX_ACTUATORS. This limit was placed to avoid the allocation of dynamic memory. Reviewed-by: Damien Le Moal Co-developed-by: Rory Chen Signed-off-by: Rory Chen Signed-off-by: Federico Gavioli Signed-off-by: Paolo Valente --- block/bfq-iosched.c | 59 +++++++++++++++++++++++++++++++++++++++------ block/bfq-iosched.h | 8 +++++- 2 files changed, 58 insertions(+), 9 deletions(-) diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index f29444d53e6a..1db7fb18f99e 100644 --- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -1797,10 +1797,25 @@ static bool bfq_bfqq_higher_class_or_weight(struct = bfq_queue *bfqq, */ static unsigned int bfq_actuator_index(struct bfq_data *bfqd, struct bio *= bio) { - /* - * Multi-actuator support not complete yet, so always return 0 - * for the moment (to keep incomplete mechanisms off). - */ + unsigned int i; + sector_t end; + + /* no search needed if one or zero ranges present */ + if (bfqd->num_actuators =3D=3D 1) + return 0; + + /* bio_end_sector(bio) gives the sector after the last one */ + end =3D bio_end_sector(bio) - 1; + + for (i =3D 0; i < bfqd->num_actuators; i++) { + if (end >=3D bfqd->sector[i] && + end < bfqd->sector[i] + bfqd->nr_sectors[i]) + return i; + } + + WARN_ONCE(true, + "bfq_actuator_index: bio sector out of ranges: end=3D%llu\n", + end); return 0; } =20 @@ -7109,6 +7124,8 @@ static int bfq_init_queue(struct request_queue *q, st= ruct elevator_type *e) { struct bfq_data *bfqd; struct elevator_queue *eq; + unsigned int i; + struct blk_independent_access_ranges *ia_ranges =3D q->disk->ia_ranges; =20 eq =3D elevator_alloc(q, e); if (!eq) @@ -7151,12 +7168,38 @@ static int bfq_init_queue(struct request_queue *q, = struct elevator_type *e) =20 bfqd->queue =3D q; =20 + bfqd->num_actuators =3D 1; /* - * Multi-actuator support not complete yet, unconditionally - * set to only one actuator for the moment (to keep incomplete - * mechanisms off). + * If the disk supports multiple actuators, copy independent + * access ranges from the request queue structure. */ - bfqd->num_actuators =3D 1; + spin_lock_irq(&q->queue_lock); + if (ia_ranges) { + /* + * Check if the disk ia_ranges size exceeds the current bfq + * actuator limit. + */ + if (ia_ranges->nr_ia_ranges > BFQ_MAX_ACTUATORS) { + pr_crit("nr_ia_ranges higher than act limit: iars=3D%d, max=3D%d.\n", + ia_ranges->nr_ia_ranges, BFQ_MAX_ACTUATORS); + pr_crit("Falling back to single actuator mode.\n"); + } else { + bfqd->num_actuators =3D ia_ranges->nr_ia_ranges; + + for (i =3D 0; i < bfqd->num_actuators; i++) { + bfqd->sector[i] =3D ia_ranges->ia_range[i].sector; + bfqd->nr_sectors[i] =3D + ia_ranges->ia_range[i].nr_sectors; + } + } + } + + /* Otherwise use single-actuator dev info */ + if (bfqd->num_actuators =3D=3D 1) { + bfqd->sector[0] =3D 0; + bfqd->nr_sectors[0] =3D get_capacity(q->disk); + } + spin_unlock_irq(&q->queue_lock); =20 INIT_LIST_HEAD(&bfqd->dispatch); =20 diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h index de2b2af643e5..830dda1f9322 100644 --- a/block/bfq-iosched.h +++ b/block/bfq-iosched.h @@ -814,7 +814,13 @@ struct bfq_data { * case of single-actuator drives. */ unsigned int num_actuators; - + /* + * Disk independent access ranges for each actuator + * in this device. + */ + sector_t sector[BFQ_MAX_ACTUATORS]; + sector_t nr_sectors[BFQ_MAX_ACTUATORS]; + struct blk_independent_access_range ia_ranges[BFQ_MAX_ACTUATORS]; }; =20 enum bfqq_state_flags { --=20 2.20.1