linux-kernel - Re: [PATCH] VFIO: platform: AMD xgbe reset module

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Date:	Thu, 15 Oct 2015 16:28:17 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Eric Auger <eric.auger@...aro.org>
Cc:	Christoffer Dall <christoffer.dall@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, eric.auger@...com,
	alex.williamson@...hat.com, b.reynal@...tualopensystems.com,
	kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org,
	thomas.lendacky@....com, patches@...aro.org,
	suravee.suthikulpanit@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] VFIO: platform: AMD xgbe reset module

On Thursday 15 October 2015 16:20:46 Eric Auger wrote:
> On 10/15/2015 02:12 PM, Christoffer Dall wrote:
> > On Thu, Oct 15, 2015 at 01:21:55PM +0200, Arnd Bergmann wrote:
> >> On Thursday 15 October 2015 10:08:02 Eric Auger wrote:
> >>> On 10/14/2015 05:38 PM, Arnd Bergmann wrote:
> >>>> On Wednesday 14 October 2015 15:33:12 Eric Auger wrote:
> >> A possible solution could be something inside the xgbe driver like
> >>
> >>
> >> static void xgbe_init_module(void)
> >> {
> >> 	int ret = 0;
> >>
> >> 	if (IS_ENABLED(CONFIG_AMD_XGBE_ETHERNET)
> >> 		ret = platform_driver_register(&xgbe_driver);
> >> 	if (ret)
> >> 		return ret;
> >>
> >> 	if (IS_ENABLED(CONFIG_VFIO_PLATFORM))
> >> 		ret = vfio_platform_register_reset(&xgbe_of_match, xgbe_platform_reset);
> >>
> >> 	return ret;	
> >> }
> >>
> >> This way you have exactly one driver module that gets loaded for the
> >> device and you can use it either with the platform_driver or through
> >> vfio.
> If I understand it correctly you still need 2 loaded modules (VFIO
> driver & XGBE driver which implements the reset function) or am I
> missing something?

That is correct, yes.
 
> I had a similar mechanism of registration in my PATCH v1 but I did the
> registration from the reset module itself instead of in the native
> driver, as you suggest here.

Right. The main difference is that you don't have two modules fighting
over the same device with the approach here.

	Arnd
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