linux-kernel - Re: [PATCH RFC 00/15] Add VFIO mediated device support and IMS support for the idxd driver.

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Message-ID: <20200423194941.GG13640@mellanox.com>
Date:   Thu, 23 Apr 2020 16:49:41 -0300
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Dave Jiang <dave.jiang@...el.com>, Vinod Koul <vkoul@...nel.org>,
        Megha Dey <megha.dey@...ux.intel.com>, maz@...nel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        "Raj, Ashok" <ashok.raj@...el.com>, Yi L Liu <yi.l.liu@...el.com>,
        Baolu Lu <baolu.lu@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Sanjay K Kumar <sanjay.k.kumar@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>, Jing Lin <jing.lin@...el.com>,
        kwankhede@...dia.com, eric.auger@...hat.com, parav@...lanox.com,
        dmaengine@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        X86 ML <x86@...nel.org>, linux-pci@...r.kernel.org,
        KVM list <kvm@...r.kernel.org>
Subject: Re: [PATCH RFC 00/15] Add VFIO mediated device support and IMS
 support for the idxd driver.

On Thu, Apr 23, 2020 at 12:17:50PM -0700, Dan Williams wrote:

> Per Megha's follow-up can you send the details about that other device
> and help clear a path for a device-specific MSI addr/data table
> format. Ever since HMM I've been sensitive, perhaps overly-sensitive,
> to claims about future upstream users. The fact that you have an
> additional use case is golden for pushing this into a common area and
> validating the scope of the proposed API.

I think I said it at plumbers, but yes, we are interested in this, and
would like dynamic MSI-like interrupts available to the driver (what
Intel calls IMS)

It is something easy enough to illustrate with any RDMA device really,
just open a MR against the addr and use RDMA_WRITE to trigger the
data. It should trigger a Linux IRQ. Nothing else should be needed.

Jason