Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265154AbUFVS2S (ORCPT ); Tue, 22 Jun 2004 14:28:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265228AbUFVSUA (ORCPT ); Tue, 22 Jun 2004 14:20:00 -0400 Received: from umhlanga.stratnet.net ([12.162.17.40]:15689 "EHLO umhlanga.STRATNET.NET") by vger.kernel.org with ESMTP id S265045AbUFVRxr (ORCPT ); Tue, 22 Jun 2004 13:53:47 -0400 To: "Nguyen, Tom L" Cc: Subject: Re: Question on using MSI in PCI driver X-Message-Flag: Warning: May contain useful information References: From: Roland Dreier Date: Tue, 22 Jun 2004 10:49:32 -0700 In-Reply-To: (Tom L. Nguyen's message of "Tue, 22 Jun 2004 08:24:02 -0700") Message-ID: <52llifo53n.fsf@topspin.com> User-Agent: Gnus/5.1006 (Gnus v5.10.6) XEmacs/21.4 (Security Through Obscurity, linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-OriginalArrivalTime: 22 Jun 2004 17:49:32.0694 (UTC) FILETIME=[4650C360:01C45881] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1221 Lines: 25 Tom> The PCI 3.0 specification has implementation notes that MMIO Tom> address space for a device's MSI-X structure should be Tom> isolated so that the software system can set different page Tom> for controlling accesses to the MSI-X structure. The Tom> implementation of MSI patch requires the PCI subsystem, not a Tom> device driver, to maintain full control of the MSI-X Tom> table/MSI-X PBA and MMIO address space of the MSI-X Tom> table/MSI-X PBA. A device driver is prohibited from Tom> requesting the MMIO address space of the MSI-X table/MSI-X Tom> PBA. Otherwise, the PCI subsystem will fail enabling MSI-X on Tom> its hardware device when it calls the function Tom> pci_enable_msi(). Thanks. I guess for the time being I will have to split up my request region calls. Do you think the msi subsystem should use a different name for the MSI-X memory region ("MSI-X iomap Failure" seems very strange to me). - Roland - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/