From patchwork Tue Apr 11 12:29:07 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Pieralisi X-Patchwork-Id: 9675357 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 101C960381 for ; Tue, 11 Apr 2017 13:45:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 05C96284DA for ; Tue, 11 Apr 2017 13:45:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id EED7628565; Tue, 11 Apr 2017 13:45:55 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 54676284DA for ; Tue, 11 Apr 2017 13:45:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=HFJM7AoUd0o4zCJ/BNytLiJNl3P9Z7DYS3N43BknL08=; b=s+7wW4w7q0L7/vJIlqagtUvEiN WznBIc8vm2Q3tY4x5ZFCCpAaMcA4kgpbxt8AWdQyyljNbTwu8o7WVQCPSCtecePw/6DiFmtgATNjt NhubaJWuGIFfxOeg5W/1QKEiFez390WEEdv9K5PJQIEBKufHL1NK9dlarFJdpY+04HuA9/IaG29Qp Af+MKCgeWaAsSdjX+nlFcYasIHO97XMSzMpzB0L2zm98JEVgkX5GvZWmT+KK0qUU5j5DZ4nqtLv6F 1p9jF7kVGXe8k3xBLVW7Jr4dC0+HjQn9dbYZjDaGlffmZquB+BjhgkNzKfk9bmsvliGdBtoFvyVE/ 79EP1o9g==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1cxw7F-0004bG-Or; Tue, 11 Apr 2017 13:45:53 +0000 Received: from merlin.infradead.org ([2001:4978:20e::2]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1cxw5i-0000y9-Ul for linux-arm-kernel@bombadil.infradead.org; Tue, 11 Apr 2017 13:44:19 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=References:In-Reply-To:Message-Id:Date: Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=xqQXoj40tu7jSxJ3jWTsbJ1JtTX4TY3x3isUJegbrqU=; b=w2pL+oR8gyLemozYyApLqNN9J HT4lz9xqhP3pyct1yOtNRnTO8rOOyBLSz6zXuty8CaoexHvCrQCaZ8nCGefWSfND/7C4SSk8nm56v m105BPtjjROK1nf0+FCnwO8DJkNzTw+zhj993yXaoSWCiuARYjInmk6pD5q/ORHuwBghEp18S43aJ z/cRBHWJBEmNEiOrsyJCmahReMiz6pSozj5ThOrRdWs7NKgKlf9y7FE4QBH/kvCafpc1J0f9sB+YU zAUHVUKMLL/8kEdbmIJRXS7HxX7+3VRHb8zrYoxXaIqOLFLtjQp0fekk6kVqyWywO0/X8QrTOWyWJ SQbAbbfCA==; Received: from foss.arm.com ([217.140.101.70]) by merlin.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1cxuw7-00083W-JI for linux-arm-kernel@lists.infradead.org; Tue, 11 Apr 2017 12:30:20 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 769D71AFA; Tue, 11 Apr 2017 05:30:19 -0700 (PDT) Received: from red-moon.cambridge.arm.com (red-moon.cambridge.arm.com [10.1.206.55]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2D7193F23B; Tue, 11 Apr 2017 05:30:18 -0700 (PDT) From: Lorenzo Pieralisi To: linux-pci@vger.kernel.org Subject: [PATCH v3 27/32] x86: include default ioremap_nopost() implementation Date: Tue, 11 Apr 2017 13:29:07 +0100 Message-Id: <20170411122923.6285-28-lorenzo.pieralisi@arm.com> X-Mailer: git-send-email 2.10.0 In-Reply-To: <20170411122923.6285-1-lorenzo.pieralisi@arm.com> References: <20170411122923.6285-1-lorenzo.pieralisi@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170411_083019_717530_E9D344A5 X-CRM114-Status: UNSURE ( 9.65 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, Lorenzo Pieralisi , linux-kernel@vger.kernel.org, Ingo Molnar , Bjorn Helgaas , Thomas Gleixner , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and Posting") mandate non-posted configuration transactions. As further highlighted in the PCIe specifications (4.0 - Rev0.3, "Ordering Considerations for the Enhanced Configuration Access Mechanism"), through ECAM and ECAM-derivative configuration mechanism, the memory mapped transactions from the host CPU into Configuration Requests on the PCI express fabric may create ordering problems for software because writes to memory address are typically posted transactions (unless the architecture can enforce through virtual address mapping non-posted write transactions behaviour) but writes to Configuration Space are not posted on the PCI express fabric. Include the asm-generic ioremap_nopost() implementation (currently falling back to ioremap_nocache()) to provide a non-posted writes ioremap interface to kernel subsystems. Signed-off-by: Lorenzo Pieralisi Cc: Thomas Gleixner Cc: Bjorn Helgaas Cc: Ingo Molnar --- arch/x86/include/asm/io.h | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h index 7afb0e2..9d431ef 100644 --- a/arch/x86/include/asm/io.h +++ b/arch/x86/include/asm/io.h @@ -201,6 +201,7 @@ extern void set_iounmap_nonlazy(void); #ifdef __KERNEL__ #include +#include /* * Convert a virtual cached pointer to an uncached pointer