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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 19819C3065E for ; Tue, 2 Jul 2024 10:15:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=QtKqiS2FdqQyx5V42cRxrrsXLbP2wtKYMXoP2kKFaO4=; b=zCkP7ddAy77qkktBh/QEoEONq2 DbTowS2G4ecRRX9W5GsmpPVBQlqDywWpfJA2lmv7GuZnVZrQNUnsJRemEmUjg/rP5zsQfgb1mQzpK ZDdhLh/SjXs7YyrDugkT9/ndNjdY1PWmEkajaM9YrugPCrx/CQaehhCSw3aEsxQSkJc8YZ7IOcpYc +sTxPW2rFpqXEhstwsg176rzPc6oXOnhx2NFhWWEKog5ew1Dsb066YQN31qkAFbe8qw7/mT+hd524 rrw7okVvWAvmd6H1PW9T+pqVd7Rkh1/SozmFn907KI52d2JRig/9y337JkyzJLxtz0SO7GG+JEtwq L1tHqatg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sOaXv-00000006JLg-2r1H; Tue, 02 Jul 2024 10:15:35 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sOZYN-000000066cg-4AY3 for linux-nvme@bombadil.infradead.org; Tue, 02 Jul 2024 09:12:00 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Transfer-Encoding:MIME-Version :References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=QtKqiS2FdqQyx5V42cRxrrsXLbP2wtKYMXoP2kKFaO4=; b=FrLx0aCugA99vJ8FyUFHv6ygpi XTRcaw+abVaG2ye9xiK1FPqBSuikJxk9FT9+uWiX/v4OaL/D5gK5kb2gUOqy0fKDTvFA+bgVHZBMX TGQXcCzYAi8wniBndz4jTsmPkAHRXXph2q/PR2LWvsO1Uei88k6knuG7iZFvQl1NPr+/9yp7T1Vg2 TqdbKsIo0oHymbcNoxL9EpysIvMIGlos5GjxQm4E6X847iLwuYcUAuSDy7Pdze9TYOfiBmIVCtWIv p2O5ZCjgzoAQ2dicdqjMv/8vCJLRLQwqqPgdBLhr5hlSTjvL9V2nZEJUbevr39nZfyrPeAO/mUJWs XbL4GNtg==; Received: from dfw.source.kernel.org ([139.178.84.217]) by desiato.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sOZXn-00000009nM7-3LR3 for linux-nvme@lists.infradead.org; Tue, 02 Jul 2024 09:11:58 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 2FA6561A27; Tue, 2 Jul 2024 09:11:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 38628C116B1; Tue, 2 Jul 2024 09:11:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1719911466; bh=awqNz5OGdWfjQsJN8aSzpTwPuTxHlPEDhpz1xfEBgC0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tmMV07HWOakUhLEx0CG5Sw8D1u/vJiFeT/1LOA4/MYdwbWSy8GvydRXDag+XzNQuF 8Mrby6JUZOtPEv8fs7zqbYmgnJ3vQ0E8UKqg2AiGbf2B4rjUPAo8OMiBBUtmXlUtED I7lOY1LwtkVhj5RlocDgysGvTm0aU3G+jzWGhM9DlHlbRQ+NQwCweNkMi/QFwfNt5f Zt/8qIdBUHskSlNSHY+lwUUXkwkAM2VZSfuGEizQOnbvlLYGPXRFfuO7ZnqRmHvzP3 sHQW3H4gZFNAN04PzGFcNOHwkG6/bvqhEaQ9QjvKDRliH9gVdc0oevJLqLUVJ+y2YD 4NmY108G1I3Ow== From: Leon Romanovsky To: Jens Axboe , Jason Gunthorpe , Robin Murphy , Joerg Roedel , Will Deacon , Keith Busch , Christoph Hellwig , "Zeng, Oak" , Chaitanya Kulkarni Cc: Sagi Grimberg , Bjorn Helgaas , Logan Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian , Alex Williamson , Marek Szyprowski , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Andrew Morton , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, iommu@lists.linux.dev, linux-nvme@lists.infradead.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v1 17/18] block: export helper to get segment max size Date: Tue, 2 Jul 2024 12:09:47 +0300 Message-ID: <3649c1dc673ea0a49a90f3e01b76ef91fb90f076.1719909395.git.leon@kernel.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240702_101156_689424_BB0B49A6 X-CRM114-Status: GOOD ( 14.86 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org From: Chaitanya Kulkarni Export the get_max_segment_size() so driver can do use that to create DMA mapping when it receives the request. Signed-off-by: Chaitanya Kulkarni Signed-off-by: Leon Romanovsky --- block/blk-merge.c | 3 ++- include/linux/blk-mq.h | 3 +++ 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/block/blk-merge.c b/block/blk-merge.c index 8534c35e0497..0561e728ef95 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -190,7 +190,7 @@ static inline unsigned get_max_io_size(struct bio *bio, * * Returns the maximum number of bytes that can be added as a single segment. */ -static inline unsigned get_max_segment_size(const struct queue_limits *lim, +inline unsigned get_max_segment_size(const struct queue_limits *lim, struct page *start_page, unsigned long offset) { unsigned long mask = lim->seg_boundary_mask; @@ -203,6 +203,7 @@ static inline unsigned get_max_segment_size(const struct queue_limits *lim, */ return min(mask - offset, (unsigned long)lim->max_segment_size - 1) + 1; } +EXPORT_SYMBOL_GPL(get_max_segment_size); /** * bvec_split_segs - verify whether or not a bvec should be split in the middle diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 89ba6b16fe8b..008c77c9b518 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -1150,4 +1150,7 @@ static inline int blk_rq_map_sg(struct request_queue *q, struct request *rq, } void blk_dump_rq_flags(struct request *, char *); +unsigned get_max_segment_size(const struct queue_limits *lim, + struct page *start_page, unsigned long offset); + #endif /* BLK_MQ_H */ -- 2.45.2