From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754790AbbLVWDF (ORCPT ); Tue, 22 Dec 2015 17:03:05 -0500 Received: from terminus.zytor.com ([198.137.202.10]:59433 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752864AbbLVWDD (ORCPT ); Tue, 22 Dec 2015 17:03:03 -0500 User-Agent: K-9 Mail for Android In-Reply-To: <201512222256.20580.arnd@arndb.de> References: <20140509191914.GA7286@jtriplet-mobl1> <4845518.edhUzAktsU@wuerfel> <201512222256.20580.arnd@arndb.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Subject: Re: [PATCH] drivers/char/mem.c: Add /dev/ioports, supporting 16-bit and 32-bit ports From: "H. Peter Anvin" Date: Tue, 22 Dec 2015 14:02:44 -0800 To: Arnd Bergmann , Santosh Shukla CC: josh@joshtriplett.org, Greg Kroah-Hartman , akpm@linux-foundation.org, Linux Kernel Mailing List , linux-api@vger.kernel.org Message-ID: <1592CC7D-B2F2-4E8B-BB90-4A20682B1FEE@zytor.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On December 22, 2015 1:56:20 PM PST, Arnd Bergmann wrote: >On Tuesday 22 December 2015, Santosh Shukla wrote: >> } >> >> So I care for /dev/ioport types interface who could do more than byte >> data copy to/from user-space. I tested this patch with little >> modification and could able to run pmd driver for arm/arm64 case. >> >> Like to know how to address pci_io region mapping problem for >> arm/arm64, in-case /dev/ioports approach is not acceptable or else I >> can spent time on restructuring the patch? >> > >For the use case you describe, can't you use the vfio framework to >access the PCI BARs? > >After all, you are talking about regular PCI devices, not access to >random unknown I/O port numbers. > > Arnd On that subject, shouldn't we have common infrastructure to deal with memory mapped I/O ports in the kernel? Or do we have that now? I obviously don't pay too much attention... -- Sent from my Android device with K-9 Mail. Please excuse brevity and formatting.