From patchwork Mon Mar 22 16:01:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 12155333 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A80B8C433C1 for ; Mon, 22 Mar 2021 16:02:53 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 401DB6198D for ; Mon, 22 Mar 2021 16:02:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 401DB6198D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 34FD46B00E7; Mon, 22 Mar 2021 11:44:02 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 326166B00E8; Mon, 22 Mar 2021 11:44:02 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1C9F96B00E9; Mon, 22 Mar 2021 11:44:02 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0224.hostedemail.com [216.40.44.224]) by kanga.kvack.org (Postfix) with ESMTP id 00E516B00E7 for ; Mon, 22 Mar 2021 11:44:01 -0400 (EDT) Received: from smtpin27.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 5EB8812EE for ; Mon, 22 Mar 2021 16:02:52 +0000 (UTC) X-FDA: 77947978542.27.3911F9B Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) by imf05.hostedemail.com (Postfix) with ESMTP id E8C23E005F18 for ; Mon, 22 Mar 2021 16:02:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1616428964; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=OgSSnWKGscYsapR0+NLAGjTG3+Bg1qLlRc5vidLzwP0=; b=UCK7Wbu/+uf7J4JbXOfxMnHByiIvo4d8qscteGJNfMwNFe53jyZSBhtw+4snI03MIvkdTw L3NwIMgbDvkyERkj7ieEdwL0hGsC5VQ6vV6xZJt/+Rigs+OQZphWSG/meJKhNGkI0/Dmyg Y/A6Xop7otxqwZUy/jwfIMGaDOeeHtE= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-147-Sn3hzdKdM_-yFzw8dtSnqg-1; Mon, 22 Mar 2021 12:02:39 -0400 X-MC-Unique: Sn3hzdKdM_-yFzw8dtSnqg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E1327107B768; Mon, 22 Mar 2021 16:02:36 +0000 (UTC) Received: from t480s.redhat.com (ovpn-115-54.ams2.redhat.com [10.36.115.54]) by smtp.corp.redhat.com (Postfix) with ESMTP id 832E15946C; Mon, 22 Mar 2021 16:02:22 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, David Hildenbrand , Andrew Morton , Greg Kroah-Hartman , Dan Williams , Daniel Vetter , Andy Shevchenko , Mauro Carvalho Chehab , Dave Young , Baoquan He , Vivek Goyal , Dave Hansen , Keith Busch , Michal Hocko , Qian Cai , Oscar Salvador , Eric Biederman , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Tom Lendacky , Brijesh Singh , x86@kernel.org, kexec@lists.infradead.org Subject: [PATCH v1 2/3] kernel/resource: make walk_mem_res() find all busy IORESOURCE_MEM resources Date: Mon, 22 Mar 2021 17:01:59 +0100 Message-Id: <20210322160200.19633-3-david@redhat.com> In-Reply-To: <20210322160200.19633-1-david@redhat.com> References: <20210322160200.19633-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Stat-Signature: 6i4sfijn4xi68133tdgkh7r6ceznn763 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: E8C23E005F18 Received-SPF: none (redhat.com>: No applicable sender policy available) receiver=imf05; identity=mailfrom; envelope-from=""; helo=us-smtp-delivery-124.mimecast.com; client-ip=216.205.24.124 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1616428964-53923 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: It used to be true that we can have system RAM only on the first level in the resourc tree. However, this is no longer holds for driver-managed system RAM (i.e., dax/kmem and virtio-mem). The function walk_mem_res() only consideres the first level and is used in arch/x86/mm/ioremap.c:__ioremap_check_mem() only. We currently fail to identify System RAM added by dax/kmem and virtio-mem as "IORES_MAP_SYSTEM_RAM", for example, allowing for remapping of such "normal RAM" in __ioremap_caller(). Let's find all busy IORESOURCE_MEM resources, making the function behave similar to walk_system_ram_res(). Cc: Andrew Morton Cc: Greg Kroah-Hartman Cc: Dan Williams Cc: Daniel Vetter Cc: Andy Shevchenko Cc: Mauro Carvalho Chehab Cc: Signed-off-by: David Hildenbrand Cc: Dave Young Cc: Baoquan He Cc: Vivek Goyal Cc: Dave Hansen Cc: Keith Busch Cc: Michal Hocko Cc: Qian Cai Cc: Oscar Salvador Cc: Eric Biederman Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: "H. Peter Anvin" Cc: Tom Lendacky Cc: Brijesh Singh Cc: x86@kernel.org Cc: kexec@lists.infradead.org Signed-off-by: David Hildenbrand Reviewed-by: Dan Williams --- kernel/resource.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/resource.c b/kernel/resource.c index 4efd6e912279..16e0c7e8ed24 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -470,7 +470,7 @@ int walk_mem_res(u64 start, u64 end, void *arg, { unsigned long flags = IORESOURCE_MEM | IORESOURCE_BUSY; - return __walk_iomem_res_desc(start, end, flags, IORES_DESC_NONE, true, + return __walk_iomem_res_desc(start, end, flags, IORES_DESC_NONE, false, arg, func); }