From patchwork Thu Nov 30 19:31:30 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: 748916 Authentication-Results: smtp.subspace.kernel.org; dkim=none Received: from mail-pf1-f170.google.com (mail-pf1-f170.google.com [209.85.210.170]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C5B2310E5; Thu, 30 Nov 2023 11:31:49 -0800 (PST) Received: by mail-pf1-f170.google.com with SMTP id d2e1a72fcca58-6cb55001124so1946734b3a.0; Thu, 30 Nov 2023 11:31:49 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701372709; x=1701977509; 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=x2fc05+XY37VuqJxsuOR+Mro4zuIHs7obA90Z7kwdNo=; b=QU/MY8tlT/vQNRPy6bKzzoztzlDxZ/AzAhrC6LoOIzX2hF4PngeqtAxd2VVP1kFnJa NCwx3aKKEaLLeCPGWnL1o217ob/BBvTZ/wj5PipsWxpuewE9u5kbh8M+YjaNOW1Ak8eh Ut6b9hkeuB8sQ4/JXOvhoS/bmbZ9lDJBWiuXGhYDDi3VnZP9Oq1Sa+PK9KVqyffWSJ8N QXr2s8MCUAlabS60DIil2DeMs47YjBD2Msrp3W5/a2EbKeShzxoGNXitqkOtD9TxHKyM PkFxbS9F7BrVy2nkl3/w4N4hTpn8xpwYbF8Rg1RvSLDPSnucn1rBhKzwIjQvg7Wljq7c 6VuA== X-Gm-Message-State: AOJu0YxMx3fFf+pSlRn8JI/1Q46IsYwRosAfSqGhxQZ6rqTodi6j7YLf nb7oBOCTRmog2dVzx+XXJ5g= X-Google-Smtp-Source: AGHT+IGVYUDB4OZHnQwPgKveJyEF57PrruZoIL7R1g1UXgRr7jeBWC4/QRtEiTLajrmD/pUy6d98dA== X-Received: by 2002:a05:6a20:7d88:b0:18c:3199:7174 with SMTP id v8-20020a056a207d8800b0018c31997174mr30699516pzj.19.1701372709003; Thu, 30 Nov 2023 11:31:49 -0800 (PST) Received: from bvanassche-linux.mtv.corp.google.com ([2620:0:1000:8411:8572:6fe3:eaf0:3b9d]) by smtp.gmail.com with ESMTPSA id m127-20020a632685000000b005c606b44405sm1635365pgm.67.2023.11.30.11.31.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Nov 2023 11:31:48 -0800 (PST) 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 , Ming Lei , Keith Busch , Damien Le Moal , Yu Kuai , Ed Tsai , "James E.J. Bottomley" , Matthias Brugger , AngeloGioacchino Del Regno Subject: [PATCH v6 3/4] scsi: core: Make fair tag sharing configurable via sysfs Date: Thu, 30 Nov 2023 11:31:30 -0800 Message-ID: <20231130193139.880955-4-bvanassche@acm.org> X-Mailer: git-send-email 2.43.0.rc2.451.g8631bc7472-goog In-Reply-To: <20231130193139.880955-1-bvanassche@acm.org> References: <20231130193139.880955-1-bvanassche@acm.org> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add a sysfs attribute to SCSI hosts for configuring fair tag sharing. Cc: Martin K. Petersen Cc: Christoph Hellwig Cc: Ming Lei Cc: Keith Busch Cc: Damien Le Moal Cc: Yu Kuai Cc: Ed Tsai Signed-off-by: Bart Van Assche --- drivers/scsi/scsi_sysfs.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c index 24f6eefb6803..58f0aba50566 100644 --- a/drivers/scsi/scsi_sysfs.c +++ b/drivers/scsi/scsi_sysfs.c @@ -403,6 +403,35 @@ show_nr_hw_queues(struct device *dev, struct device_attribute *attr, char *buf) } static DEVICE_ATTR(nr_hw_queues, S_IRUGO, show_nr_hw_queues, NULL); +static ssize_t show_fair_sharing(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct blk_mq_tag_set *tag_set = &shost->tag_set; + + return sysfs_emit(buf, "%d\n", + !(tag_set->flags & BLK_MQ_F_DISABLE_FAIR_TAG_SHARING)); +} + +static ssize_t store_fair_sharing(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct blk_mq_tag_set *tag_set = &shost->tag_set; + bool enable; + int res; + + res = kstrtobool(buf, &enable); + if (res < 0) + return res; + blk_mq_update_fair_sharing(tag_set, enable); + + return count; +} + +static DEVICE_ATTR(fair_sharing, 0644, show_fair_sharing, store_fair_sharing); + static struct attribute *scsi_sysfs_shost_attrs[] = { &dev_attr_use_blk_mq.attr, &dev_attr_unique_id.attr, @@ -421,6 +450,7 @@ static struct attribute *scsi_sysfs_shost_attrs[] = { &dev_attr_host_reset.attr, &dev_attr_eh_deadline.attr, &dev_attr_nr_hw_queues.attr, + &dev_attr_fair_sharing.attr, NULL };