From patchwork Fri Jul 5 08:14:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13724507 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.subspace.kernel.org (Postfix) with ESMTPS id 2021F145B24; Fri, 5 Jul 2024 08:15:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720167317; cv=none; b=hozXFHy73lqGDjP80yy5D8VkqqJmeL+CVIG/KtVcsTA64z1r/A6r/6kIKuMFwH6BiB0ZSV54aIJasA22kndzjWY/rMAlE7DkpykkdNLdlz4yw8JOqO3Glluig9PgD2r4zUqJUUUI6/o+CMY+5nhT3sKIiCuw5JnatATcxVGhS+s= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720167317; c=relaxed/simple; bh=A6iEpg8zRxlSKm/VHGCIjtrPAdPrqYzVQVS1f0EjP5w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=SKEOc058fO6XMDG5gDRUjItGX58TMwnP7isMatbEMgcLUDnv4VsS0E/ysq+x8QQRfm375O1g05vTrPiQfVNqIf7Jsn75WGoLeZP1elF/YNRRspMAlq2+j+stGKYZ5Y6mBp49F6r+VOp22NUUn3rLqyV/r01s57X9SeX+lOmK9rg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=VULN9By9; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="VULN9By9" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; 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=uG31UgimUbuo+zCMxygAYLOYQ/KAs9C6e3J9T3445bo=; b=VULN9By9M3yOW7yT4sK1B7aV5D EZxQVX6aricmnoT79/xdsBkvE9RxYPw6Fe88Jrm1pgp4nUc3yZYRekWz3U4CEAKBsIQTbQmAabQ8d eOhIVD8Zv6/8GzmCQELIUQlsRc+5tRuolfKdCUvwkDITODu82jIBFVskxYI5kP3JLhL31SHP6f8v9 2u8aoUfVbmKyYhcuN5e/98RvPuFkJRQzNz0YiqZCB0j+S/7C/aPOyKkHyy+5jyrCJJDb+L7KdhHeA tjUS0jGpQdzlZIAMZ4c7o2vvpn63xgf+gsjHJgVvUwnpYAwkNwS/Nj2ZJ90j8q/Nl3GCVeucWgBRj AxHEXXyw==; Received: from 2a02-8389-2341-5b80-7f6c-d254-a41c-2a9c.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:7f6c:d254:a41c:2a9c] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sPe66-0000000FFKf-1Sgc; Fri, 05 Jul 2024 08:15:14 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Geert Uytterhoeven , linux-m68k@lists.linux-m68k.org, linux-block@vger.kernel.org Subject: [PATCH 1/2] block: pass a phys_addr_t to get_max_segment_size Date: Fri, 5 Jul 2024 10:14:33 +0200 Message-ID: <20240705081508.2110169-2-hch@lst.de> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240705081508.2110169-1-hch@lst.de> References: <20240705081508.2110169-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Work on a single address to simplify the logic, and prepare the callers from using better helpers. Signed-off-by: Christoph Hellwig Reviewed-by: Geert Uytterhoeven --- block/blk-merge.c | 22 ++++++++++------------ 1 file changed, 10 insertions(+), 12 deletions(-) diff --git a/block/blk-merge.c b/block/blk-merge.c index cff20bcc0252a7..515173342eb757 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -207,25 +207,22 @@ static inline unsigned get_max_io_size(struct bio *bio, } /** - * get_max_segment_size() - maximum number of bytes to add as a single segment + * get_max_segment_size() - maximum number of bytes to add to a single segment * @lim: Request queue limits. - * @start_page: See below. - * @offset: Offset from @start_page where to add a segment. + * @paddr: address of the range to add * - * Returns the maximum number of bytes that can be added as a single segment. + * Returns the maximum number of bytes of the range starting at @addr that can + * be added to a single request. */ static inline unsigned get_max_segment_size(const struct queue_limits *lim, - struct page *start_page, unsigned long offset) + phys_addr_t paddr) { - unsigned long mask = lim->seg_boundary_mask; - - offset = mask & (page_to_phys(start_page) + offset); - /* * Prevent an overflow if mask = ULONG_MAX and offset = 0 by adding 1 * after having calculated the minimum. */ - return min(mask - offset, (unsigned long)lim->max_segment_size - 1) + 1; + return min(lim->seg_boundary_mask - (lim->seg_boundary_mask & paddr), + (unsigned long)lim->max_segment_size - 1) + 1; } /** @@ -258,7 +255,7 @@ static bool bvec_split_segs(const struct queue_limits *lim, unsigned seg_size = 0; while (len && *nsegs < max_segs) { - seg_size = get_max_segment_size(lim, bv->bv_page, + seg_size = get_max_segment_size(lim, page_to_phys(bv->bv_page) + bv->bv_offset + total_len); seg_size = min(seg_size, len); @@ -495,7 +492,8 @@ static unsigned blk_bvec_map_sg(struct request_queue *q, while (nbytes > 0) { unsigned offset = bvec->bv_offset + total; unsigned len = min(get_max_segment_size(&q->limits, - bvec->bv_page, offset), nbytes); + page_to_phys(bvec->bv_page) + offset), + nbytes); struct page *page = bvec->bv_page; /*