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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1E66AC43334 for ; Mon, 11 Jul 2022 12:43:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231338AbiGKMnR (ORCPT ); Mon, 11 Jul 2022 08:43:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41942 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230373AbiGKMnN (ORCPT ); Mon, 11 Jul 2022 08:43:13 -0400 X-Greylist: delayed 904 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Mon, 11 Jul 2022 05:43:10 PDT Received: from sender4-op-o14.zoho.com (sender4-op-o14.zoho.com [136.143.188.14]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BF2DC3C8DE for ; Mon, 11 Jul 2022 05:43:10 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1657542474; cv=none; d=zohomail.com; s=zohoarc; b=mTYrTnKkEr+cHoZzwUWzoySyMDYwyJHGayRwmV3goFkvb4OBV7RimTOzTY/Lj0PfO9bJNJ3PFdQVj4sAYijZMxmUgZVI+awVdfE82SDlv0iyXWH/UkMb/Q1ARhKlHLdTLsP8gCoOnyRsB/Yb/znNDUaQN040rgBG1qML8nFAB+Y= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1657542474; h=Content-Transfer-Encoding:Cc:Date:From:MIME-Version:Message-ID:Subject:To; bh=ewN4EUuycObOYW0SLHnXrpbyF2hcjOKmDmqQa9qow+Q=; b=eonyWLjjL3dIAg04CjrercdmL0p9ChaAeFzDHnjHy3ulSUQJe01/0daekqfQsLnJiD63hjiyfsoNvYFf3eRKbF5+RaNIyi84nicZcoFYcBX+zpbZ+Vm96+B0NnsqOEKeHDKUCSTwbiStYUq5IdQ7hi+kkPM14/BVfTSqjNKmdPg= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=linux.beauty; spf=pass smtp.mailfrom=me@linux.beauty; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1657542474; s=zmail; d=linux.beauty; i=me@linux.beauty; h=From:From:To:To:Cc:Cc:Subject:Subject:Date:Date:Message-Id:Message-Id:MIME-Version:Content-Transfer-Encoding:Reply-To; bh=ewN4EUuycObOYW0SLHnXrpbyF2hcjOKmDmqQa9qow+Q=; b=O+f//ihUMnagKkZDjAeTqyZlBVXpvNhbaP8ksXbo7DOIOguy4f81+zQbl40Lb4Wm VIs5WyE5xPgp6xVrmMZRnc6Yp7E6hOqqXfSoPdl1u/gSNQUzL0Blf8H3tLbe4YASgLE xezfb81h0A0FGgB/yxIbvk+mZsrjHSXjyMXm2M0o= Received: from sh-lchen.ambarella.net (180.169.129.130 [180.169.129.130]) by mx.zohomail.com with SMTPS id 1657542473449720.3148602247644; Mon, 11 Jul 2022 05:27:53 -0700 (PDT) From: Li Chen To: Catalin Marinas , Will Deacon , Rob Herring , Frank Rowand , Andrew Morton Cc: Li Chen , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 0/4] add struct page and Direct I/O support to reserved memory Date: Mon, 11 Jul 2022 20:24:50 +0800 Message-Id: <20220711122459.13773-1-me@linux.beauty> X-Mailer: git-send-email 2.36.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-ZohoMailClient: External Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch series use ZONE_DEVICE and mhp to add Direct I/O support to reserved memory when rmem is as dio's src buffer. Our use case is when isp generates frame and writes to given memory region, arm(kernel) will try to read frames from the reserved memory region. If throughput is low, frame loss will be serious. Before this patch series, we can only use bufferd I/O and the throughput is very low even with the help of AIO/io_uring. This patch is tested on v5.15.35 + no-map rmem region, and can be git am into 5.19-rc5 without conflicts. Li Chen (4): of: add struct page support to rmem mm/sparse: skip no-map memblock check when fill_subsection_map arm64: mm: move memblock_clear_nomap after __add_pages sample/reserved_mem: Introduce a sample of struct page and dio support to no-map rmem arch/arm64/mm/mmu.c | 2 +- drivers/of/Kconfig | 9 ++ drivers/of/of_reserved_mem.c | 218 +++++++++++++++++++++++++++++++- include/linux/of_reserved_mem.h | 11 ++ mm/sparse.c | 4 +- samples/Kconfig | 7 + samples/Makefile | 1 + samples/reserved_mem/Makefile | 2 + samples/reserved_mem/rmem_dio.c | 116 +++++++++++++++++ 9 files changed, 367 insertions(+), 3 deletions(-) create mode 100755 samples/reserved_mem/Makefile create mode 100755 samples/reserved_mem/rmem_dio.c -- 2.25.1