linux-kernel - Re: Requirement to get BAR pci_bus

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Message-ID: <CABe79T6k387EnDrpydTbQYQ+sZoWXKUee23EDzDJqnkroOmodA@mail.gmail.com>
Date:   Thu, 14 Jun 2018 15:59:55 +0530
From:   Srinath Mannam <srinath.mannam@...adcom.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Abhishek Shah <abhishek.shah@...adcom.com>,
        Vikram Prakash <vikram.prakash@...adcom.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nvme@...ts.infradead.org,
        Alex Williamson <alex.williamson@...hat.com>,
        kvm@...r.kernel.org
Subject: Re: Requirement to get BAR pci_bus_address in user space

++ Alex Williamson, kvm,

Hi Christoph,

Thank you for quick reply.

If we want to add this in vfio then I think we need to do the same in
uio case also.

As I mentioned in previous mail, in the current implementation
resource information (address and size) is gathering from resource
named file created in /sys directory.
So I expect it would be better to have similar method as existing in sysfs.

Regards,
Srinath.

On Thu, Jun 14, 2018 at 3:50 PM, Christoph Hellwig <hch@....de> wrote:
> The only safe way to use PCI(e) devices in userspace is through vfio.
> I think that is where you need to take your inquiries.