From patchwork Fri Sep 25 19:12:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 11800649 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 E24DC16BC for ; Fri, 25 Sep 2020 19:30:27 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id AB46423718 for ; Fri, 25 Sep 2020 19:30:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AB46423718 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 ACD8B6B006E; Fri, 25 Sep 2020 15:30:26 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id A7DCD6B0070; Fri, 25 Sep 2020 15:30:26 -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 9471A6B0071; Fri, 25 Sep 2020 15:30:26 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0120.hostedemail.com [216.40.44.120]) by kanga.kvack.org (Postfix) with ESMTP id 715966B006E for ; Fri, 25 Sep 2020 15:30:26 -0400 (EDT) Received: from smtpin16.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 2E84462E0 for ; Fri, 25 Sep 2020 19:30:26 +0000 (UTC) X-FDA: 77302575252.16.can15_1600fc72716a Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin16.hostedemail.com (Postfix) with ESMTP id 0B47B101E6464 for ; Fri, 25 Sep 2020 19:30:26 +0000 (UTC) X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,dan.j.williams@intel.com,,RULES_HIT,0,RBL:134.134.136.20:@intel.com:.lbl8.mailshell.net-62.50.0.100 64.95.201.95;04ygix8x3ufwngp7r9sxf9mo9e5f3ypjr6knbr1jcp84m7nbcfwwqh93rcdtb8p.ny8dygpg6gko9wyzsm9ekn68z8ohyyumt5oq3wmnrqwad1hxr8bc574hzujiaax.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:none,Custom_rules:0:0:0,LFtime:23,LUA_SUMMARY:none X-HE-Tag: can15_1600fc72716a X-Filterd-Recvd-Size: 6369 Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by imf16.hostedemail.com (Postfix) with ESMTP for ; Fri, 25 Sep 2020 19:30:25 +0000 (UTC) IronPort-SDR: RA+jUcncXuB1DLeWsQrNSDqtF9ttPt3EvMYJrxxIm45pyjYToe+vHbXgL5o6pR97GeNJgxWN54 lInIqQEJ34Yw== X-IronPort-AV: E=McAfee;i="6000,8403,9755"; a="149272050" X-IronPort-AV: E=Sophos;i="5.77,303,1596524400"; d="scan'208";a="149272050" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Sep 2020 12:30:23 -0700 IronPort-SDR: ysA/Rkwzd/BphO4dBoKfduaGz2F+AyB+jqp6/pz6QtLPZmAY58Z5zcYyJUL5ZuH6lQgKzOvTHo fS3QzxV1hL2w== X-IronPort-AV: E=Sophos;i="5.77,303,1596524400"; d="scan'208";a="348515408" 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 12:30:23 -0700 Subject: [PATCH v5 04/17] device-dax/kmem: replace release_resource() with release_mem_region() From: Dan Williams To: akpm@linux-foundation.org Cc: David Hildenbrand , Vishal Verma , Dave Hansen , Pavel Tatashin , Brice Goglin , Dave Jiang , David Hildenbrand , Ira Weiny , Jia He , Joao Martins , Jonathan Cameron , linux-mm@kvack.org, linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org Date: Fri, 25 Sep 2020 12:12:02 -0700 Message-ID: <160106112239.30709.15909567572288425294.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 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: Towards removing the mode specific @dax_kmem_res attribute from the generic 'struct dev_dax', and preparing for multi-range support, change the kmem driver to use the idiomatic release_mem_region() to pair with the initial request_mem_region(). This also eliminates the need to open code the release of the resource allocated by request_mem_region(). As there are no more dax_kmem_res users, delete this struct member. Cc: David Hildenbrand Cc: Vishal Verma Cc: Dave Hansen Cc: Pavel Tatashin Cc: Brice Goglin Cc: Dave Jiang Cc: David Hildenbrand Cc: Ira Weiny Cc: Jia He Cc: Joao Martins Cc: Jonathan Cameron Signed-off-by: Dan Williams --- drivers/dax/dax-private.h | 3 --- drivers/dax/kmem.c | 20 +++++++------------- 2 files changed, 7 insertions(+), 16 deletions(-) diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h index 6779f683671d..12a2dbc43b40 100644 --- a/drivers/dax/dax-private.h +++ b/drivers/dax/dax-private.h @@ -42,8 +42,6 @@ struct dax_region { * @dev - device core * @pgmap - pgmap for memmap setup / lifetime (driver owned) * @range: resource range for the instance - * @dax_mem_res: physical address range of hotadded DAX memory - * @dax_mem_name: name for hotadded DAX memory via add_memory_driver_managed() */ struct dev_dax { struct dax_region *region; @@ -52,7 +50,6 @@ struct dev_dax { struct device dev; struct dev_pagemap *pgmap; struct range range; - struct resource *dax_kmem_res; }; static inline u64 range_len(struct range *range) diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c index 6fe2cb1c5f7c..e56fc688bdc5 100644 --- a/drivers/dax/kmem.c +++ b/drivers/dax/kmem.c @@ -33,7 +33,7 @@ int dev_dax_kmem_probe(struct device *dev) { struct dev_dax *dev_dax = to_dev_dax(dev); struct range range = dax_kmem_range(dev_dax); - struct resource *new_res; + struct resource *res; char *res_name; int numa_node; int rc; @@ -56,8 +56,8 @@ int dev_dax_kmem_probe(struct device *dev) return -ENOMEM; /* Region is permanently reserved if hotremove fails. */ - new_res = request_mem_region(range.start, range_len(&range), res_name); - if (!new_res) { + res = request_mem_region(range.start, range_len(&range), res_name); + if (!res) { dev_warn(dev, "could not reserve region [%#llx-%#llx]\n", range.start, range.end); kfree(res_name); return -EBUSY; @@ -69,23 +69,20 @@ int dev_dax_kmem_probe(struct device *dev) * inherit flags from the parent since it may set new flags * unknown to us that will break add_memory() below. */ - new_res->flags = IORESOURCE_SYSTEM_RAM; + res->flags = IORESOURCE_SYSTEM_RAM; /* * Ensure that future kexec'd kernels will not treat this as RAM * automatically. */ - rc = add_memory_driver_managed(numa_node, new_res->start, - resource_size(new_res), kmem_name); + rc = add_memory_driver_managed(numa_node, range.start, range_len(&range), kmem_name); if (rc) { - release_resource(new_res); - kfree(new_res); + release_mem_region(range.start, range_len(&range)); kfree(res_name); return rc; } dev_set_drvdata(dev, res_name); - dev_dax->dax_kmem_res = new_res; return 0; } @@ -95,7 +92,6 @@ static int dev_dax_kmem_remove(struct device *dev) { struct dev_dax *dev_dax = to_dev_dax(dev); struct range range = dax_kmem_range(dev_dax); - struct resource *res = dev_dax->dax_kmem_res; const char *res_name = dev_get_drvdata(dev); int rc; @@ -114,10 +110,8 @@ static int dev_dax_kmem_remove(struct device *dev) } /* Release and free dax resources */ - release_resource(res); - kfree(res); + release_mem_region(range.start, range_len(&range)); kfree(res_name); - dev_dax->dax_kmem_res = NULL; return 0; }