From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1031188AbdADRjQ (ORCPT <rfc822;w@1wt.eu>);
        Wed, 4 Jan 2017 12:39:16 -0500
Received: from mail-pg0-f65.google.com ([74.125.83.65]:33273 "EHLO
        mail-pg0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S933751AbdADRjM (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Wed, 4 Jan 2017 12:39:12 -0500
Subject: Need clarity on MSI handling in RC driver
To: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org
References: <2fea5a0c-7410-97fd-91d1-ae6a06ab1a52@gmail.com>
Cc: helgaas@kernel.org, marc.zyngier@arm.com, arnd@arndb.de,
        mark.rutland@arm.com
From: valmiki <valmikibow@gmail.com>
Message-ID: <307e8512-7e14-39a2-c225-6db44e443aea@gmail.com>
Date: Wed, 4 Jan 2017 23:09:06 +0530
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:45.0) Gecko/20100101
 Thunderbird/45.6.0
MIME-Version: 1.0
In-Reply-To: <2fea5a0c-7410-97fd-91d1-ae6a06ab1a52@gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Hi All,

I have a doubt, the MSI domains are handled differently in different RC 
drivers.

Some drivers use irq_domain_add_linear alone, and some use 
pci_msi_create_irq_domain also to handle MSI.

In most of the 32-bit architectures only irq_domain_add_linear is used 
and in 64 bit drivers both pci_msi_create_irq_domain and 
irq_domain_add_linear are used.

So is this because of architecture difference between ARM and ARM64 ?

Thanks & Regards,
valmiki