From patchwork Mon Aug 3 05:04:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 11697321 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 A9CD0138A for ; Mon, 3 Aug 2020 05:20:45 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 74EFA206DA for ; Mon, 3 Aug 2020 05:20:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 74EFA206DA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 04B2C8D00EB; Mon, 3 Aug 2020 01:20:45 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id F3C3D8D00E9; Mon, 3 Aug 2020 01:20:44 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E2CCF8D00EB; Mon, 3 Aug 2020 01:20:44 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0032.hostedemail.com [216.40.44.32]) by kanga.kvack.org (Postfix) with ESMTP id CD6378D00E9 for ; Mon, 3 Aug 2020 01:20:44 -0400 (EDT) Received: from smtpin22.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 97C211EE6 for ; Mon, 3 Aug 2020 05:20:44 +0000 (UTC) X-FDA: 77108107608.22.silk65_410608b26f9b Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin22.hostedemail.com (Postfix) with ESMTP id 736D618038E71 for ; Mon, 3 Aug 2020 05:20:44 +0000 (UTC) X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,dan.j.williams@intel.com,,RULES_HIT:30054:30064:30080,0,RBL:134.134.136.126:@intel.com:.lbl8.mailshell.net-64.95.201.95 62.18.0.100;04yrtuogaf1faqqk19k5cjnkadaoiyc494jaciimxapmntteqo833te6e4je9y1.jye1t445kx17te8e4x3wp3qxpb55kde488wqwg7rkcxsym7ojyzwzuqfxfan5ei.1-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:ft,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:24,LUA_SUMMARY:none X-HE-Tag: silk65_410608b26f9b X-Filterd-Recvd-Size: 3404 Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by imf46.hostedemail.com (Postfix) with ESMTP for ; Mon, 3 Aug 2020 05:20:43 +0000 (UTC) IronPort-SDR: MJu2ebvI8DO5eHu8CyLHQRSVf6RlNtKmq7P7wMBN+ZtVTAljNDNYeK7Jv+wmDMlSt8mVccJUUq myyFFz09pimQ== X-IronPort-AV: E=McAfee;i="6000,8403,9701"; a="139623558" X-IronPort-AV: E=Sophos;i="5.75,429,1589266800"; d="scan'208";a="139623558" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Aug 2020 22:20:42 -0700 IronPort-SDR: U/rM5DhcxpE7WZh4bHtjOp8I1vx1/1gMeTlx03D1ZbeBttQuqYJI2akDB473GZ9U0J8YdTqELW sgRUKKnaB3Xw== X-IronPort-AV: E=Sophos;i="5.75,429,1589266800"; d="scan'208";a="305681342" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.16]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Aug 2020 22:20:42 -0700 Subject: [PATCH v4 22/23] dax/hmem: Introduce dax_hmem.region_idle parameter From: Dan Williams To: akpm@linux-foundation.org Cc: Joao Martins , peterz@infradead.org, vishal.l.verma@intel.com, dave.hansen@linux.intel.com, ard.biesheuvel@linaro.org, vishal.l.verma@intel.com, linux-mm@kvack.org, linux-nvdimm@lists.01.org, joao.m.martins@oracle.com, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, dri-devel@lists.freedesktop.org Date: Sun, 02 Aug 2020 22:04:24 -0700 Message-ID: <159643106460.4062302.5868522341307530091.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <159643094279.4062302.17779410714418721328.stgit@dwillia2-desk3.amr.corp.intel.com> References: <159643094279.4062302.17779410714418721328.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-3-g996c MIME-Version: 1.0 X-Rspamd-Queue-Id: 736D618038E71 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam02 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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. Signed-off-by: Joao Martins Link: https://lore.kernel.org/r/20200716172913.19658-4-joao.m.martins@oracle.com 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))