From patchwork Mon Oct 23 21:53:52 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: 737747 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 C8D33C25B49 for ; Mon, 23 Oct 2023 21:56:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231873AbjJWV4v (ORCPT ); Mon, 23 Oct 2023 17:56:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60410 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229763AbjJWV4u (ORCPT ); Mon, 23 Oct 2023 17:56:50 -0400 Received: from mail-pj1-f41.google.com (mail-pj1-f41.google.com [209.85.216.41]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 99FEFDE; Mon, 23 Oct 2023 14:56:48 -0700 (PDT) Received: by mail-pj1-f41.google.com with SMTP id 98e67ed59e1d1-27d18475ed4so2785549a91.0; Mon, 23 Oct 2023 14:56:48 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698098208; x=1698703008; 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=cTMw0a7/Uh2Lje80+tulC82TkA3w3+NwQr1GUTziZqE=; b=g9nOgpuE6QUZj3EfRGG3NGqbVZWwxKLmyUA/II1uTbBu6v19MBenjzk+QLzKUd7Bj2 Yoqzm/ZvuputGPu4eHSy3yyQ/FfQB2U/8lXx/D0IK8zZrrfFhW4S4Bam4M12I5SaCxtX L/Nb0Ndh4GulGFPQ6LGPHForjCzNUlHx3aSOVXW1yKLXhwbJsbGqQFnPTGivTKRVDXtD YUvMDEzcdrJA9t/8qn7InJM2WiEimAC8Kjge7WFimbg9NaeLrCdtBFHzlwBrUM4cSGan aiaOBVkWzKXu5lNuVmjcD+HWLuniX8lNCZArdIq7R4bAojjD7aOx5s2MG/V71cDvNWHk OipA== X-Gm-Message-State: AOJu0Yx5IV3Tru27R7R6XY0qTS5jCmJ37g3SsFPqtIlMoo9OBo8jNiS3 F00DDjQVy4aLWXtN4EGgx84= X-Google-Smtp-Source: AGHT+IF/kM2h/DfPvHLxlHnJ/jky6/+RCZRPKHEbnln4JlMS+8VZ30sPYvXvW3i7Mnk/FI0XsgD1rQ== X-Received: by 2002:a17:90b:1490:b0:27c:edd5:6137 with SMTP id js16-20020a17090b149000b0027cedd56137mr8088074pjb.25.1698098207924; Mon, 23 Oct 2023 14:56:47 -0700 (PDT) Received: from bvanassche-linux.mtv.corp.google.com ([2620:15c:211:201:14f9:170e:9304:1c4e]) by smtp.gmail.com with ESMTPSA id b12-20020a17090acc0c00b0027d12b1e29dsm7851029pju.25.2023.10.23.14.56.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 23 Oct 2023 14:56:47 -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 , Damien Le Moal , Hannes Reinecke , Nitesh Shetty , Ming Lei Subject: [PATCH v14 01/19] block: Introduce more member variables related to zone write locking Date: Mon, 23 Oct 2023 14:53:52 -0700 Message-ID: <20231023215638.3405959-2-bvanassche@acm.org> X-Mailer: git-send-email 2.42.0.758.gaed0368e0e-goog In-Reply-To: <20231023215638.3405959-1-bvanassche@acm.org> References: <20231023215638.3405959-1-bvanassche@acm.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Many but not all storage controllers require serialization of zoned writes. Introduce two new request queue limit member variables related to write serialization. 'driver_preserves_write_order' allows block drivers to indicate that the order of write commands is preserved and hence that serialization of writes per zone is not required. 'use_zone_write_lock' is set by disk_set_zoned() if and only if the block device has zones and if the block driver does not preserve the order of write requests. Reviewed-by: Damien Le Moal Reviewed-by: Hannes Reinecke Reviewed-by: Nitesh Shetty Cc: Christoph Hellwig Cc: Ming Lei Signed-off-by: Bart Van Assche --- block/blk-settings.c | 15 +++++++++++++++ block/blk-zoned.c | 1 + include/linux/blkdev.h | 10 ++++++++++ 3 files changed, 26 insertions(+) diff --git a/block/blk-settings.c b/block/blk-settings.c index 0046b447268f..4c776c08f190 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -56,6 +56,8 @@ void blk_set_default_limits(struct queue_limits *lim) lim->alignment_offset = 0; lim->io_opt = 0; lim->misaligned = 0; + lim->driver_preserves_write_order = false; + lim->use_zone_write_lock = false; lim->zoned = BLK_ZONED_NONE; lim->zone_write_granularity = 0; lim->dma_alignment = 511; @@ -82,6 +84,8 @@ void blk_set_stacking_limits(struct queue_limits *lim) lim->max_dev_sectors = UINT_MAX; lim->max_write_zeroes_sectors = UINT_MAX; lim->max_zone_append_sectors = UINT_MAX; + /* Request-based stacking drivers do not reorder requests. */ + lim->driver_preserves_write_order = true; } EXPORT_SYMBOL(blk_set_stacking_limits); @@ -685,6 +689,10 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, b->max_secure_erase_sectors); t->zone_write_granularity = max(t->zone_write_granularity, b->zone_write_granularity); + t->driver_preserves_write_order = t->driver_preserves_write_order && + b->driver_preserves_write_order; + t->use_zone_write_lock = t->use_zone_write_lock || + b->use_zone_write_lock; t->zoned = max(t->zoned, b->zoned); return ret; } @@ -949,6 +957,13 @@ void disk_set_zoned(struct gendisk *disk, enum blk_zoned_model model) } q->limits.zoned = model; + /* + * Use the zone write lock only for zoned block devices and only if + * the block driver does not preserve the order of write commands. + */ + q->limits.use_zone_write_lock = model != BLK_ZONED_NONE && + !q->limits.driver_preserves_write_order; + if (model != BLK_ZONED_NONE) { /* * Set the zone write granularity to the device logical block diff --git a/block/blk-zoned.c b/block/blk-zoned.c index 619ee41a51cc..112620985bff 100644 --- a/block/blk-zoned.c +++ b/block/blk-zoned.c @@ -631,6 +631,7 @@ void disk_clear_zone_settings(struct gendisk *disk) q->limits.chunk_sectors = 0; q->limits.zone_write_granularity = 0; q->limits.max_zone_append_sectors = 0; + q->limits.use_zone_write_lock = false; blk_mq_unfreeze_queue(q); } diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index eef450f25982..b67bd8433225 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -316,6 +316,16 @@ struct queue_limits { unsigned char misaligned; unsigned char discard_misaligned; unsigned char raid_partial_stripes_expensive; + /* + * Whether or not the block driver preserves the order of write + * requests. Set by the block driver. + */ + bool driver_preserves_write_order; + /* + * Whether or not zone write locking should be used. Set by + * disk_set_zoned(). + */ + bool use_zone_write_lock; enum blk_zoned_model zoned; /*