linux-kernel - Need clarity on MSI handling in RC driver

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Message-ID: <307e8512-7e14-39a2-c225-6db44e443aea@gmail.com>
Date:   Wed, 4 Jan 2017 23:09:06 +0530
From:   valmiki <valmikibow@...il.com>
To:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Cc:     helgaas@...nel.org, marc.zyngier@....com, arnd@...db.de,
        mark.rutland@....com
Subject: Need clarity on MSI handling in RC driver

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