linux-kernel - Re: [PATCH v4 3/3] vfio/nvgrace-gpu: Check the HBM training and C2C link status

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Message-ID: <20250120131222.GG5556@nvidia.com>
Date: Mon, 20 Jan 2025 09:12:22 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: Alex Williamson <alex.williamson@...hat.com>
Cc: Ankit Agrawal <ankita@...dia.com>, Yishai Hadas <yishaih@...dia.com>,
	"shameerali.kolothum.thodi@...wei.com" <shameerali.kolothum.thodi@...wei.com>,
	"kevin.tian@...el.com" <kevin.tian@...el.com>,
	Zhi Wang <zhiw@...dia.com>, Aniket Agashe <aniketa@...dia.com>,
	Neo Jia <cjia@...dia.com>, Kirti Wankhede <kwankhede@...dia.com>,
	"Tarun Gupta (SW-GPU)" <targupta@...dia.com>,
	Vikram Sethi <vsethi@...dia.com>, Andy Currid <acurrid@...dia.com>,
	Alistair Popple <apopple@...dia.com>,
	John Hubbard <jhubbard@...dia.com>, Dan Williams <danw@...dia.com>,
	"Anuj Aggarwal (SW-GPU)" <anuaggarwal@...dia.com>,
	Matt Ochs <mochs@...dia.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 3/3] vfio/nvgrace-gpu: Check the HBM training and C2C
 link status

On Sun, Jan 19, 2025 at 08:22:52PM -0700, Alex Williamson wrote:
> On second thought, I guess a vfio-pci variant driver can't
> automatically bind to a device, whether statically built or not, so
> maybe this isn't a concern.  I'm not sure if there are other concerns
> with busy waiting for up to 30s at driver probe.  Thanks,

It is not entirely abnormal. mlx5 has a timeout while it pushes
its first command and on the failure path it is long > 30s IIRC..

Drivers that take a couple of seconds to complete probe are not
unusual.

Jason