From patchwork Fri Sep 25 19:13:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 11800695 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id F2B9D6CA for ; Fri, 25 Sep 2020 19:31:33 +0000 (UTC) Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id CDB4B2076D for ; Fri, 25 Sep 2020 19:31:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CDB4B2076D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvdimm-bounces@lists.01.org Received: from ml01.vlan13.01.org (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 913B715508B25; Fri, 25 Sep 2020 12:31:33 -0700 (PDT) Received-SPF: Pass (mailfrom) identity=mailfrom; client-ip=134.134.136.31; helo=mga06.intel.com; envelope-from=dan.j.williams@intel.com; receiver= Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 7D1A215508B1E for ; Fri, 25 Sep 2020 12:31:31 -0700 (PDT) IronPort-SDR: RL4qaohDAgPPQes3jAh6+AXtXAyzPcuI1NNATiA77ZhosmgvbuYXETOHr7AOlg78EF6Ua3K4mY ENOaLYsPN41A== X-IronPort-AV: E=McAfee;i="6000,8403,9755"; a="223215800" X-IronPort-AV: E=Sophos;i="5.77,303,1596524400"; d="scan'208";a="223215800" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Sep 2020 12:31:31 -0700 IronPort-SDR: +RoebDDnCqGqo9e7gIxH7H/7a3OBdUmnEcz0O0yLSM7kWluyc3urPS/pmU3LLmx4OteSxYGHP1 lsh1A/4uY3Gg== X-IronPort-AV: E=Sophos;i="5.77,303,1596524400"; d="scan'208";a="348515710" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.16]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Sep 2020 12:31:30 -0700 Subject: [PATCH v5 16/17] dax/hmem: introduce dax_hmem.region_idle parameter From: Dan Williams To: akpm@linux-foundation.org Date: Fri, 25 Sep 2020 12:13:10 -0700 Message-ID: <160106119033.30709.11249962152222193448.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <160106109960.30709.7379926726669669398.stgit@dwillia2-desk3.amr.corp.intel.com> References: <160106109960.30709.7379926726669669398.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-3-g996c MIME-Version: 1.0 Message-ID-Hash: J2WZ4OXMCWLEXO2NHFLBZAS4SRCAKSFG X-Message-ID-Hash: J2WZ4OXMCWLEXO2NHFLBZAS4SRCAKSFG X-MailFrom: dan.j.williams@intel.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; suspicious-header CC: Joao Martins , dave.hansen@linux.intel.com, linux-mm@kvack.org, linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org X-Mailman-Version: 3.1.1 Precedence: list List-Id: "Linux-nvdimm developer list." Archived-At: List-Archive: List-Help: List-Post: List-Subscribe: List-Unsubscribe: From: Joao Martins Introduce a new module parameter for dax_hmem which initializes all region devices as free, rather than allocating a pagemap for the region by default. All hmem devices created with dax_hmem.region_idle=1 will have full available size for creating dynamic dax devices. Link: https://lkml.kernel.org/r/159643106460.4062302.5868522341307530091.stgit@dwillia2-desk3.amr.corp.intel.com Link: https://lore.kernel.org/r/20200716172913.19658-4-joao.m.martins@oracle.com Signed-off-by: Joao Martins Signed-off-by: Dan Williams --- drivers/dax/hmem/hmem.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/dax/hmem/hmem.c b/drivers/dax/hmem/hmem.c index 1a3347bb6143..1bf040dbc834 100644 --- a/drivers/dax/hmem/hmem.c +++ b/drivers/dax/hmem/hmem.c @@ -5,6 +5,9 @@ #include #include "../bus.h" +static bool region_idle; +module_param_named(region_idle, region_idle, bool, 0644); + static int dax_hmem_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -30,7 +33,7 @@ static int dax_hmem_probe(struct platform_device *pdev) data = (struct dev_dax_data) { .dax_region = dax_region, .id = -1, - .size = resource_size(res), + .size = region_idle ? 0 : resource_size(res), }; dev_dax = devm_create_dev_dax(&data); if (IS_ERR(dev_dax))