linux-kernel - Re: [PATCH v5 3/3] vfio/nvgrace-gpu: Check the HBM training and C2C link status

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Message-ID:
 <SA1PR12MB7199C5FD0D564C6220C07DDEB0E32@SA1PR12MB7199.namprd12.prod.outlook.com>
Date: Fri, 24 Jan 2025 17:53:26 +0000
From: Ankit Agrawal <ankita@...dia.com>
To: Alex Williamson <alex.williamson@...hat.com>
CC: Jason Gunthorpe <jgg@...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>, Krishnakant Jaju <kjaju@...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 v5 3/3] vfio/nvgrace-gpu: Check the HBM training and C2C
 link status

>> +static int nvgrace_gpu_wait_device_ready(struct pci_dev *pdev)
>> +{
>> +     unsigned long timeout = jiffies + msecs_to_jiffies(POLL_TIMEOUT_MS);
>> +     void __iomem *io;
>> +     int ret = -ETIME;
>> +
>> +     ret = pci_enable_device(pdev);
>> +     if (ret)
>> +             return ret;
>> +
>> +     ret = pci_request_selected_regions(pdev, 1 << 0, "vfio-pci");
>
> All the overhead of enabling the device and requesting the region, only
> to undo it around this simple test is unfortunate, but I think correct.

Yeah, thanks for guiding through that.

> Even though this is only briefly taken, I'd suggest using KBUILD_MODNAME
> there rather than "vfio-pci" to differentiate from the core code.
> Thanks,
>
> Alex

Understood, will make the change.