linux-kernel - Re: [PATCH v2 0/2] PCI: device link quirk for NVIDIA GPU

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Date:   Thu, 13 Jun 2019 15:57:20 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Abhishek Sahu <abhsahu@...dia.com>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        lukas@...ner.de
Subject: Re: [PATCH v2 0/2] PCI: device link quirk for NVIDIA GPU

On Thu, Jun 06, 2019 at 02:52:23PM +0530, Abhishek Sahu wrote:
> * v2:
> 
> 1. Make the pci device link helper function generic which can be
>    used for other multi-function PCI devices also.
> 2. Minor changes in comments and commit logs.
> 
> * v1:
> 
> NVIDIA Turing GPU [1] has hardware support for USB Type-C and
> VirtualLink [2]. The Turing GPU is a multi-function PCI device
> which has the following four functions:
> 
> 	- VGA display controller (Function 0)
> 	- Audio controller (Function 1)
> 	- USB xHCI Host controller (Function 2)
> 	- USB Type-C USCI controller (Function 3)
> 
> Currently NVIDIA and Nouveau GPU drivers only manage function 0.
> Rest of the functions are managed by other drivers. These functions
> internally in the hardware are tightly coupled. When function 0 goes
> in runtime suspended state, then it will do power gating for most of
> the hardware blocks. Some of these hardware blocks are used by
> the other PCI functions, which leads to functional failure. In the
> mainline kernel, the device link is present between
> function 0 and function 1.  This patch series deals with creating
> a similar kind of device link between function 0 and
> functions 2 and 3.
> 
> [1] https://www.nvidia.com/content/dam/en-zz/Solutions/design-visualization/technologies/turing-architecture/NVIDIA-Turing-Architecture-Whitepaper.pdf
> [2] https://en.wikipedia.org/wiki/VirtualLink
> 
> Abhishek Sahu (2):
>   PCI: Code reorganization for creating device link
>   PCI: Create device link for NVIDIA GPU

Applied to pci/misc for v5.3, thanks!