From patchwork Tue Apr 11 12:28:49 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Pieralisi X-Patchwork-Id: 9675339 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 8229560381 for ; Tue, 11 Apr 2017 13:45:16 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7842228550 for ; Tue, 11 Apr 2017 13:45:16 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6CFBA2856B; Tue, 11 Apr 2017 13:45:16 +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 900C928565 for ; Tue, 11 Apr 2017 13:45:15 +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=3Xh0FBqvWYFzUtxF1tGkvKT5vkqM5Jz0J86aIuo4GTg=; b=bCCQqaxKvq/wPNFIRk3c+7xwKs 5+9Q6k41xfyFra2XxY2ZtNpJCruC9NHuZsZxjwKnsBI0zAsCyU3DZSxvI1fBV+Uq6mhj4xAC8EQwF 1gb78QwYO4P5BLwnG8UHNva6I6iMUGeBadMOwZFVhu8b17H7e0vvjmqzCWDCoL2zRcmG6nNgaag7z wF/ZUiTIeKoA6FkKODzjY2tuAJRbcOZ2H70muCi4SdXKOlgOb16Yji6dZ5gsTqVrTkXG1Vh4XstJK Zgp5HkZspLk4GxL8Lcv012rCl2l7P1CmKJRW1Y/6bixUJRnQUxmuqsn8+ThncE4rIa+oe96RwoWxs CzutqguA==; 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 1cxw6c-0003dd-HM; Tue, 11 Apr 2017 13:45:14 +0000 Received: from merlin.infradead.org ([2001:4978:20e::2]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1cxw5g-0000y9-0C for linux-arm-kernel@bombadil.infradead.org; Tue, 11 Apr 2017 13:44:16 +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=enqwq/Re6qPb7uYpd0y3ltw0rjM4ziFBoE0LXUSXxGg=; b=N1+7CVQAa/aprGplatPPUx8Gx WJfc6oYACS1OCxpfNflR3wsAiyF7OgBTWPHpbqwE0kS1SuJqw7eGqo9F8otaDE85QhEThEmHzbnYc dzpYU2MEGsoY9HUHwCKkPu40wlJ80GkosK7ofif38x6Cgtwim03X0vAlhFf9Upz0uhp1Bflixv2LG eEhijDrklgOk68cSFDXoVj78E9x0Jj2Xdiwxb74rMQrj1zJPJam2IIqjqAAcCPX1ovTuZId/HL8BD BXCXPNPRC+9ITD6ctmKT2KJOth0eNmX3xPJ0GDNrsJPhTq6c/ryKN5Vxc7HCXHMGDXMYijZ0vSHEB J3TD0gWaA==; Received: from foss.arm.com ([217.140.101.70]) by merlin.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1cxuwK-00086v-Qp for linux-arm-kernel@lists.infradead.org; Tue, 11 Apr 2017 12:30:33 +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 0CBF2199B; Tue, 11 Apr 2017 05:29:46 -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 07BED3F23B; Tue, 11 Apr 2017 05:29:44 -0700 (PDT) From: Lorenzo Pieralisi To: linux-pci@vger.kernel.org Subject: [PATCH v3 09/32] frv: include default ioremap_nopost() implementation Date: Tue, 11 Apr 2017 13:28:49 +0100 Message-Id: <20170411122923.6285-10-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_083032_959824_3C093BE9 X-CRM114-Status: UNSURE ( 8.82 ) 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, Bjorn Helgaas , Lorenzo Pieralisi , linux-kernel@vger.kernel.org, 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: Bjorn Helgaas --- arch/frv/include/asm/io.h | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/frv/include/asm/io.h b/arch/frv/include/asm/io.h index 8062fc7..8808502 100644 --- a/arch/frv/include/asm/io.h +++ b/arch/frv/include/asm/io.h @@ -290,6 +290,7 @@ static inline void __iomem *ioremap_fullcache(unsigned long physaddr, unsigned l #define ioremap_wc ioremap_nocache #define ioremap_uc ioremap_nocache +#include extern void iounmap(void volatile __iomem *addr);