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 1560FC43334 for ; Wed, 15 Jun 2022 16:13:37 +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:Subject: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-Id:Date :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=CEsEo1LL0bapP/SgeXBMkHfYqc6Wv4poDHt3UT6FxEg=; b=vqElCnFmzaVYVmS3hRe7t5DZcs WMT9ux9GVjGNENQbaGt6RT4Te5TZkTMTDvdpcxX3v8NAdtuHlAxrA3Z4t6artww5ZRm7qtAybqCPt HQvcC8gCjYdtOY63JKWkwT4gnKnkHq85ipKXiCwusqEj17C/BUCjLd5jjtVj0nWdVxqRY/UOtYf44 IVGKFvGu90Dr9Um8wJM3CRLQh6Ab+AZQxdhchDCG3BfPsYaZ3FUVRyq5QzN0xQVM3GwveGfNxlD9H rXFYE2Jf2JMqJR9G2SnEv+043bXNJflinG3pt+YOe+HQNclz/3meudIAms55lfT93x/pRw8UPhtL2 gMicw7HQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o1Ve7-00FKGL-K0; Wed, 15 Jun 2022 16:13:31 +0000 Received: from ale.deltatee.com ([204.191.154.188]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1o1VdU-00FJYo-KQ for linux-nvme@lists.infradead.org; Wed, 15 Jun 2022 16:12:55 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=deltatee.com; s=20200525; h=Subject:MIME-Version:References:In-Reply-To: Message-Id:Date:Cc:To:From:content-disposition; bh=CEsEo1LL0bapP/SgeXBMkHfYqc6Wv4poDHt3UT6FxEg=; b=Nn5f3rDAO5IH26Vm3tZC0/G00z 08nWaGa176sIR0AMP9ufpCFl8dqGInHVEIurBrhZxq8qyYDrYDC/FLwjHaP0xkmUhL0tsPpMFsnzC TrHv4QKvFeifgNV5SXw6bzeBiEo5BMK1Wn4z1hGAMBkF+nRrTHuJRTK9R1MaGtIlhbHed9Xofrf+/ /E6cLO35IfpR+c+O/fl3k708ke9cdQ/QBKGT2Ot+27a8SgRnqOwwPWqIzU5BypTjVOfuD2fhybceo a/BKPzddCviQTOWiZgVLC94Cl7+8/HNXYOTzmN6fEQW6XtzPv1NSvwCLPRKV2ZpBid/6o/AbJcz6B VA4O9vnw==; Received: from cgy1-donard.priv.deltatee.com ([172.16.1.31]) by ale.deltatee.com with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1o1VdP-0084iP-Uw; Wed, 15 Jun 2022 10:12:48 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1o1VdI-0004ak-WE; Wed, 15 Jun 2022 10:12:41 -0600 From: Logan Gunthorpe To: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-pci@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org Cc: Stephen Bates , Christoph Hellwig , Dan Williams , Jason Gunthorpe , =?UTF-8?q?Christian=20K=C3=B6nig?= , John Hubbard , Don Dutile , Matthew Wilcox , Daniel Vetter , Minturn Dave B , Jason Ekstrand , Dave Hansen , Xiong Jianxin , Bjorn Helgaas , Ira Weiny , Robin Murphy , Martin Oliveira , Chaitanya Kulkarni , Ralph Campbell , Logan Gunthorpe Date: Wed, 15 Jun 2022 10:12:28 -0600 Message-Id: <20220615161233.17527-17-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220615161233.17527-1-logang@deltatee.com> References: <20220615161233.17527-1-logang@deltatee.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 172.16.1.31 X-SA-Exim-Rcpt-To: linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-pci@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, sbates@raithlin.com, hch@lst.de, jgg@ziepe.ca, christian.koenig@amd.com, ddutile@redhat.com, willy@infradead.org, daniel.vetter@ffwll.ch, jason@jlekstrand.net, dave.hansen@linux.intel.com, helgaas@kernel.org, dan.j.williams@intel.com, dave.b.minturn@intel.com, jianxin.xiong@intel.com, ira.weiny@intel.com, robin.murphy@arm.com, martin.oliveira@eideticom.com, ckulkarnilinux@gmail.com, jhubbard@nvidia.com, rcampbell@nvidia.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v7 16/21] block: add check when merging zone device pages X-SA-Exim-Version: 4.2.1 (built Sat, 13 Feb 2021 17:57:42 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220615_091252_691154_833585B8 X-CRM114-Status: GOOD ( 12.86 ) 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 Consecutive zone device pages should not be merged into the same sgl or bvec segment with other types of pages or if they belong to different pgmaps. Otherwise getting the pgmap of a given segment is not possible without scanning the entire segment. This helper returns true either if both pages are not zone device pages or both pages are zone device pages with the same pgmap. Add a helper to determine if zone device pages are mergeable and use this helper in page_is_mergeable(). Signed-off-by: Logan Gunthorpe --- block/bio.c | 2 ++ include/linux/mm.h | 23 +++++++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/block/bio.c b/block/bio.c index f92d0223247b..a402a4760457 100644 --- a/block/bio.c +++ b/block/bio.c @@ -865,6 +865,8 @@ static inline bool page_is_mergeable(const struct bio_vec *bv, return false; if (xen_domain() && !xen_biovec_phys_mergeable(bv, page)) return false; + if (!zone_device_pages_have_same_pgmap(bv->bv_page, page)) + return false; *same_page = ((vec_end_addr & PAGE_MASK) == page_addr); if (*same_page) diff --git a/include/linux/mm.h b/include/linux/mm.h index 0bcb54ea503c..33b2f4d9fd0a 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1108,6 +1108,24 @@ static inline bool is_zone_device_page(const struct page *page) { return page_zonenum(page) == ZONE_DEVICE; } + +/* + * Consecutive zone device pages should not be merged into the same sgl + * or bvec segment with other types of pages or if they belong to different + * pgmaps. Otherwise getting the pgmap of a given segment is not possible + * without scanning the entire segment. This helper returns true either if + * both pages are not zone device pages or both pages are zone device pages + * with the same pgmap. + */ +static inline bool zone_device_pages_have_same_pgmap(const struct page *a, + const struct page *b) +{ + if (is_zone_device_page(a) != is_zone_device_page(b)) + return false; + if (!is_zone_device_page(a)) + return true; + return a->pgmap == b->pgmap; +} extern void memmap_init_zone_device(struct zone *, unsigned long, unsigned long, struct dev_pagemap *); #else @@ -1115,6 +1133,11 @@ static inline bool is_zone_device_page(const struct page *page) { return false; } +static inline bool zone_device_pages_have_same_pgmap(const struct page *a, + const struct page *b) +{ + return true; +} #endif static inline bool folio_is_zone_device(const struct folio *folio) -- 2.30.2