From patchwork Tue Jan 16 03:39:26 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shin'ichiro Kawasaki X-Patchwork-Id: 13520397 Received: from esa6.hgst.iphmx.com (esa6.hgst.iphmx.com [216.71.154.45]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7CDC26FBF for ; Tue, 16 Jan 2024 03:39:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=wdc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=wdc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=wdc.com header.i=@wdc.com header.b="f/6RS2Vy" DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1705376369; x=1736912369; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=irhz8VrK03c727KlS7IPSzKwJQIsay7bEI9KfvckRoQ=; b=f/6RS2VyXiAYuG1IkcrH4DJK60upgs7XJwHfSUBVs5zOALkXDHRUEP8M fUgAonrIM/Wc8f9mBD3k372DGmmSEVSTX7jxG8uaQTpaEOYZ33KQrhQq4 7IxLlJ/ged03wcz0i0lHSu5c9JGrYIrpq991gH9blVT9CzndQZggzk35V hiFygjKJhQQTVDlyrmrZ0Hds66bKScClZFooQCbd57XtkX3fD2XttbUS+ AEXXpLEbJCWqdEQ9DnKuJGaBIGXZ8ih7fCZgVjFHmZ0+d9Jng0WGQgrBf CXPV7Py+AQLqhy2nV2IUdpGlKwywAflz+8BiouUj3nHSOR+iJUefav9vm w==; X-CSE-ConnectionGUID: yVcE8ptCSHGiRdglrz2Scg== X-CSE-MsgGUID: DSzc4kxWTceG0B53JkL8Pw== X-IronPort-AV: E=Sophos;i="6.04,197,1695657600"; d="scan'208";a="7037849" Received: from h199-255-45-15.hgst.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 16 Jan 2024 11:39:27 +0800 IronPort-SDR: lQmw3sYKRZyzLLefLmy54o92C5/vtV7ZeV9Y0a0uOwuekqhQwKo8uM3AQ1QgRmBLL/QAR7pTT6 sfS2irQZi6hQ== Received: from uls-op-cesaip02.wdc.com ([10.248.3.37]) by uls-op-cesaep02.wdc.com with ESMTP/TLS/ECDHE-RSA-AES128-GCM-SHA256; 15 Jan 2024 18:43:58 -0800 IronPort-SDR: 7XU92nPYmIMIm/Utl5zq9LL0ChY5GBptQfnyGk1kgH+IANRMyONCpKWsxTyFfGiloHdQBC0Dtn 8WMbGyq4bp+Q== WDCIronportException: Internal Received: from unknown (HELO shindev.ssa.fujisawa.hgst.com) ([10.149.66.30]) by uls-op-cesaip02.wdc.com with ESMTP; 15 Jan 2024 19:39:27 -0800 From: Shin'ichiro Kawasaki To: linux-block@vger.kernel.org, Jens Axboe Cc: Shin'ichiro Kawasaki Subject: [PATCH for-next] null_blk: add configfs variable shared_tags Date: Tue, 16 Jan 2024 12:39:26 +0900 Message-ID: <20240116033927.628524-1-shinichiro.kawasaki@wdc.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Allow setting shared_tags through configfs, which could only be set as a module parameter. For that purpose, delay tag_set initialization from null_init() to null_add_dev(). Introduce the flag tag_set_initialized to manage the initialization status of tag_set. The following parameters can not be set through configfs yet: timeout requeue init_hctx Signed-off-by: Shin'ichiro Kawasaki --- This patch will allow running the blktests test cases block/010 and block/022 using the built-in null_blk driver. Corresponding blktests side changes are drafted here [1]. [1] https://github.com/kawasaki/blktests/tree/shared_tags drivers/block/null_blk/main.c | 38 ++++++++++++++++--------------- drivers/block/null_blk/null_blk.h | 1 + 2 files changed, 21 insertions(+), 18 deletions(-) diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c index 36755f263e8e..c3361e521564 100644 --- a/drivers/block/null_blk/main.c +++ b/drivers/block/null_blk/main.c @@ -69,6 +69,7 @@ static LIST_HEAD(nullb_list); static struct mutex lock; static int null_major; static DEFINE_IDA(nullb_indexes); +static bool tag_set_initialized = false; static struct blk_mq_tag_set tag_set; enum { @@ -165,8 +166,8 @@ static bool g_blocking; module_param_named(blocking, g_blocking, bool, 0444); MODULE_PARM_DESC(blocking, "Register as a blocking blk-mq driver device"); -static bool shared_tags; -module_param(shared_tags, bool, 0444); +static bool g_shared_tags; +module_param_named(shared_tags, g_shared_tags, bool, 0444); MODULE_PARM_DESC(shared_tags, "Share tag set between devices for blk-mq"); static bool g_shared_tag_bitmap; @@ -426,6 +427,7 @@ NULLB_DEVICE_ATTR(zone_max_open, uint, NULL); NULLB_DEVICE_ATTR(zone_max_active, uint, NULL); NULLB_DEVICE_ATTR(virt_boundary, bool, NULL); NULLB_DEVICE_ATTR(no_sched, bool, NULL); +NULLB_DEVICE_ATTR(shared_tags, bool, NULL); NULLB_DEVICE_ATTR(shared_tag_bitmap, bool, NULL); static ssize_t nullb_device_power_show(struct config_item *item, char *page) @@ -571,6 +573,7 @@ static struct configfs_attribute *nullb_device_attrs[] = { &nullb_device_attr_zone_offline, &nullb_device_attr_virt_boundary, &nullb_device_attr_no_sched, + &nullb_device_attr_shared_tags, &nullb_device_attr_shared_tag_bitmap, NULL, }; @@ -653,10 +656,11 @@ static ssize_t memb_group_features_show(struct config_item *item, char *page) "badblocks,blocking,blocksize,cache_size," "completion_nsec,discard,home_node,hw_queue_depth," "irqmode,max_sectors,mbps,memory_backed,no_sched," - "poll_queues,power,queue_mode,shared_tag_bitmap,size," - "submit_queues,use_per_node_hctx,virt_boundary,zoned," - "zone_capacity,zone_max_active,zone_max_open," - "zone_nr_conv,zone_offline,zone_readonly,zone_size\n"); + "poll_queues,power,queue_mode,shared_tag_bitmap," + "shared_tags,size,submit_queues,use_per_node_hctx," + "virt_boundary,zoned,zone_capacity,zone_max_active," + "zone_max_open,zone_nr_conv,zone_offline,zone_readonly," + "zone_size\n"); } CONFIGFS_ATTR_RO(memb_group_, features); @@ -738,6 +742,7 @@ static struct nullb_device *null_alloc_dev(void) dev->zone_max_active = g_zone_max_active; dev->virt_boundary = g_virt_boundary; dev->no_sched = g_no_sched; + dev->shared_tags = g_shared_tags; dev->shared_tag_bitmap = g_shared_tag_bitmap; return dev; } @@ -2124,7 +2129,13 @@ static int null_add_dev(struct nullb_device *dev) goto out_free_nullb; if (dev->queue_mode == NULL_Q_MQ) { - if (shared_tags) { + if (dev->shared_tags) { + if (!tag_set_initialized) { + rv = null_init_tag_set(NULL, &tag_set); + if (rv) + goto out_cleanup_queues; + tag_set_initialized = true; + } nullb->tag_set = &tag_set; rv = 0; } else { @@ -2311,18 +2322,12 @@ static int __init null_init(void) g_submit_queues = 1; } - if (g_queue_mode == NULL_Q_MQ && shared_tags) { - ret = null_init_tag_set(NULL, &tag_set); - if (ret) - return ret; - } - config_group_init(&nullb_subsys.su_group); mutex_init(&nullb_subsys.su_mutex); ret = configfs_register_subsystem(&nullb_subsys); if (ret) - goto err_tagset; + return ret; mutex_init(&lock); @@ -2349,9 +2354,6 @@ static int __init null_init(void) unregister_blkdev(null_major, "nullb"); err_conf: configfs_unregister_subsystem(&nullb_subsys); -err_tagset: - if (g_queue_mode == NULL_Q_MQ && shared_tags) - blk_mq_free_tag_set(&tag_set); return ret; } @@ -2370,7 +2372,7 @@ static void __exit null_exit(void) } mutex_unlock(&lock); - if (g_queue_mode == NULL_Q_MQ && shared_tags) + if (tag_set_initialized) blk_mq_free_tag_set(&tag_set); } diff --git a/drivers/block/null_blk/null_blk.h b/drivers/block/null_blk/null_blk.h index 929f659dd255..7bcfc0922ae8 100644 --- a/drivers/block/null_blk/null_blk.h +++ b/drivers/block/null_blk/null_blk.h @@ -119,6 +119,7 @@ struct nullb_device { bool zoned; /* if device is zoned */ bool virt_boundary; /* virtual boundary on/off for the device */ bool no_sched; /* no IO scheduler for the device */ + bool shared_tags; /* share tag set between devices for blk-mq */ bool shared_tag_bitmap; /* use hostwide shared tags */ };