linux-kernel - Re: [PATCH v3 0/3] uio: add MSI/MSI-X support to uio_pci

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Message-ID: <5613F838.70003@cloudius-systems.com>
Date:	Tue, 6 Oct 2015 19:35:04 +0300
From:	Vlad Zolotarov <vladz@...udius-systems.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org, hjk@...sjkoch.de, corbet@....net,
	gregkh@...uxfoundation.org, bruce.richardson@...el.com,
	avi@...udius-systems.com, gleb@...udius-systems.com,
	stephen@...workplumber.org, alexander.duyck@...il.com
Subject: Re: [PATCH v3 0/3] uio: add MSI/MSI-X support to uio_pci_generic
 driver



On 10/06/15 18:13, Michael S. Tsirkin wrote:
> On Tue, Oct 06, 2015 at 05:40:23PM +0300, Vlad Zolotarov wrote:
>>> I'm guessing it doesn't enable MSI though, does it?
>> Again, enabling MSI is a matter of a trivial patch configuring device
>> registers on the device BAR.
> No, not really.

Sure that is!
Look at pci_msi_set_enable(): it's a single read and then write, just 
like the code for bus master enabling. The msi capability address may be 
retrieved from lspci and then mapped for instance using sysfs.

Configuring the MSI table is a few more reads and writes too but at the 
bottom line - it's a trivial code too...

>

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