From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9434BC76190 for ; Fri, 26 Jul 2019 08:32:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 704E321951 for ; Fri, 26 Jul 2019 08:32:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726616AbfGZIca (ORCPT ); Fri, 26 Jul 2019 04:32:30 -0400 Received: from relmlor1.renesas.com ([210.160.252.171]:41239 "EHLO relmlie5.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725842AbfGZIc3 (ORCPT ); Fri, 26 Jul 2019 04:32:29 -0400 X-IronPort-AV: E=Sophos;i="5.64,310,1559487600"; d="scan'208";a="22504208" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie5.idc.renesas.com with ESMTP; 26 Jul 2019 17:32:23 +0900 Received: from localhost.localdomain (unknown [10.166.17.210]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id AF5FD42017BC; Fri, 26 Jul 2019 17:32:23 +0900 (JST) From: Yoshihiro Shimoda To: ulf.hansson@linaro.org, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, joro@8bytes.org, axboe@kernel.dk Cc: wsa+renesas@sang-engineering.com, linux-mmc@vger.kernel.org, iommu@lists.linux-foundation.org, linux-block@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Yoshihiro Shimoda Subject: [PATCH v9 4/5] block: add a helper function to merge the segments Date: Fri, 26 Jul 2019 17:31:15 +0900 Message-Id: <1564129876-28261-5-git-send-email-yoshihiro.shimoda.uh@renesas.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1564129876-28261-1-git-send-email-yoshihiro.shimoda.uh@renesas.com> References: <1564129876-28261-1-git-send-email-yoshihiro.shimoda.uh@renesas.com> Sender: linux-renesas-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org This patch adds a helper function whether a queue can merge the segments by the DMA MAP layer (e.g. via IOMMU). Signed-off-by: Yoshihiro Shimoda Reviewed-by: Christoph Hellwig Reviewed-by: Simon Horman --- block/blk-settings.c | 22 ++++++++++++++++++++++ include/linux/blkdev.h | 2 ++ 2 files changed, 24 insertions(+) diff --git a/block/blk-settings.c b/block/blk-settings.c index 45f2c52..6a78ea0 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -4,6 +4,7 @@ */ #include #include +#include #include #include #include @@ -831,6 +832,27 @@ void blk_queue_write_cache(struct request_queue *q, bool wc, bool fua) } EXPORT_SYMBOL_GPL(blk_queue_write_cache); +/** + * blk_queue_can_use_dma_map_merging - configure queue for merging segments. + * @q: the request queue for the device + * @dev: the device pointer for dma + * + * Tell the block layer about merging the segments by dma map of @q. + */ +bool blk_queue_can_use_dma_map_merging(struct request_queue *q, + struct device *dev) +{ + unsigned long boundary = dma_get_merge_boundary(dev); + + if (!boundary) + return false; + + /* No need to update max_segment_size. see blk_queue_virt_boundary() */ + blk_queue_virt_boundary(q, boundary); + + return true; +} + static int __init blk_settings_init(void) { blk_max_low_pfn = max_low_pfn - 1; diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 1ef375d..f6d55e2 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1085,6 +1085,8 @@ extern void blk_queue_dma_alignment(struct request_queue *, int); extern void blk_queue_update_dma_alignment(struct request_queue *, int); extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); +extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q, + struct device *dev); /* * Number of physical segments as sent to the device. -- 2.7.4