linux-kernel - Re: [PATCH RFC] staging: Add driver to communicate with the T2 Security Chip

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Message-ID:
 <PN3PR01MB95970AA2AD456AC15B7AD3C6B8D62@PN3PR01MB9597.INDPRD01.PROD.OUTLOOK.COM>
Date: Mon, 10 Mar 2025 13:59:59 +0000
From: Aditya Garg <gargaditya08@...e.com>
To: "andriy.shevchenko@...ux.intel.com" <andriy.shevchenko@...ux.intel.com>
CC: Robin Murphy <robin.murphy@....com>, "gregkh@...uxfoundation.org"
	<gregkh@...uxfoundation.org>, "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"joro@...tes.org" <joro@...tes.org>, "will@...nel.org" <will@...nel.org>,
	"linux-staging@...ts.linux.dev" <linux-staging@...ts.linux.dev>, Linux Kernel
 Mailing List <linux-kernel@...r.kernel.org>, "linux-pci@...r.kernel.org"
	<linux-pci@...r.kernel.org>, "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
	Aun-Ali Zaidi <admin@...eit.net>, "paul@...rm.io" <paul@...rm.io>, Orlando
 Chamberlain <orlandoch.dev@...il.com>
Subject: Re: [PATCH RFC] staging: Add driver to communicate with the T2
 Security Chip



> On 10 Mar 2025, at 7:25 PM, andriy.shevchenko@...ux.intel.com wrote:
> 
> On Mon, Mar 10, 2025 at 01:49:13PM +0000, Robin Murphy wrote:
>>> On 2025-03-09 8:40 am, Aditya Garg wrote:
>>> From: Paul Pawlowski <paul@...rm.io>
>>> 
>>> This patch adds a driver named apple-bce, to add support for the T2
>>> Security Chip found on certain Macs.
>>> 
>>> The driver has 3 main components:
>>> 
>>> BCE (Buffer Copy Engine) - this is what the files in the root directory
>>> are for. This estabilishes a basic communication channel with the T2.
>>> VHCI and Audio both require this component.
>>> 
>>> VHCI - this is a virtual USB host controller; keyboard, mouse and
>>> other system components are provided by this component (other
>>> drivers use this host controller to provide more functionality).
>>> 
>>> Audio - a driver for the T2 audio interface, currently only audio
>>> output is supported.
>>> 
>>> Currently, suspend and resume for VHCI is broken after a firmware
>>> update in iBridge since macOS Sonoma.
> 
>> I'm slightly puzzled why this was sent to the IOMMU maintainers when it
>> doesn't touch any IOMMU code, nor even contain any reference to the IOMMU
>> API at all...
> 
> People like to put a random people to a random contributions :-)
> 
> Aditya, you can utilise my "smart" script [1] to send the series
> to more-or-less relevant people (but definitely to the right ones
> ± potentially interested, it has a heuristics inside).

Thanks a lot for this. I used a bit AI to get maintainers for this, looks like IOMMU got added. Sorry for that :)
> 
> [1]: https://github.com/andy-shev/home-bin-tools/blob/master/ge2maintainer.sh
> 
> --
> With Best Regards,
> Andy Shevchenko
> 
>