From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DFA27C43334 for ; Fri, 22 Jul 2022 22:42:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:Message-ID: In-Reply-To:Subject:cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=HCs7b1br5dqVuaG34N99fJyapCWJAjeThTEj5BgXtTo=; b=fyGYYGvzUQHiG0 ++41iJBR1bQqrqOY6ihdSfSdfceJtEr2UaklzTFN6Kah4nupdMnrND5vs01DkZ+oXYzqDrjRnlfBf yqGHRzKiwI1tmojJPy29usGOxZBkW83axhPxySreaQkw6inGW75+k8zRS/AH1LfEAXzOOr/lcFd/b YUyudblcne2iKAPggGFkhy1fCAeVyE4bA4lehF5XMnvOxXQiDbimodI2jOXBkQw4xhfRgj7PwlsNf Wg7uP+apMyvriqjYrgj1WOuhQpRUsliSywrL8QvXHTaDt58+xi+rbbjzV9Z85yEBlRaBXQOIJ29xT qAwoWQ/yiFXTJQblgZ/A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oF1LX-00CDZT-K4; Fri, 22 Jul 2022 22:42:11 +0000 Received: from angie.orcam.me.uk ([2001:4190:8020::34]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oF1LM-00CDR0-DJ; Fri, 22 Jul 2022 22:42:02 +0000 Received: by angie.orcam.me.uk (Postfix, from userid 500) id 5D6F792009C; Sat, 23 Jul 2022 00:41:54 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by angie.orcam.me.uk (Postfix) with ESMTP id 598B392009B; Fri, 22 Jul 2022 23:41:54 +0100 (BST) Date: Fri, 22 Jul 2022 23:41:54 +0100 (BST) From: "Maciej W. Rozycki" To: Rob Herring cc: Arnd Bergmann , Palmer Dabbelt , Bjorn Helgaas , Stafford Horne , "linux-kernel@vger.kernel.org" , Catalin Marinas , Will Deacon , Guo Ren , Paul Walmsley , Albert Ou , Richard Weinberger , Anton Ivanov , Johannes Berg , linux-arm-kernel , linux-csky@vger.kernel.org, linux-riscv , linux-um , PCI , "open list:GENERIC INCLUDE/ASM HEADER FILES" Subject: Re: [PATCH v3 2/2] asm-generic: Add new pci.h and use it In-Reply-To: Message-ID: References: User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220722_154200_638766_143CFA54 X-CRM114-Status: UNSURE ( 7.35 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Fri, 22 Jul 2022, Rob Herring wrote: > P.S. I really wish I/O space would disappear completely. Some systems make it happen already, such as the POWER9 platform and its PHB4 host bridge (which doesn't handle PCIe TLP I/O read or write commands at all), however some PCI/e devices do require I/O space, such as IEEE 1284 parallel port adapters. Some PCI devices dating back as far as to 1990s provide dual mapping of their resources via an I/O and a memory BAR both at a time, so we can choose which to use depending on circumstances. FWIW, Maciej _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv