linux-kernel - Re: [PATCH v3 11/18] dmaengine: idxd: ims setup for the vdcm

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Message-ID: <20201009115737.GI4734@nvidia.com>
Date:   Fri, 9 Oct 2020 08:57:37 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     "Raj, Ashok" <ashok.raj@...el.com>
CC:     Thomas Gleixner <tglx@...utronix.de>,
        Dave Jiang <dave.jiang@...el.com>, <vkoul@...nel.org>,
        <megha.dey@...el.com>, <maz@...nel.org>, <bhelgaas@...gle.com>,
        <alex.williamson@...hat.com>, <jacob.jun.pan@...el.com>,
        <yi.l.liu@...el.com>, <baolu.lu@...el.com>, <kevin.tian@...el.com>,
        <sanjay.k.kumar@...el.com>, <tony.luck@...el.com>,
        <jing.lin@...el.com>, <dan.j.williams@...el.com>,
        <kwankhede@...dia.com>, <eric.auger@...hat.com>,
        <parav@...lanox.com>, <rafael@...nel.org>, <netanelg@...lanox.com>,
        <shahafs@...lanox.com>, <yan.y.zhao@...ux.intel.com>,
        <pbonzini@...hat.com>, <samuel.ortiz@...el.com>,
        <mona.hossain@...el.com>, <dmaengine@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <x86@...nel.org>,
        <linux-pci@...r.kernel.org>, <kvm@...r.kernel.org>
Subject: Re: [PATCH v3 11/18] dmaengine: idxd: ims setup for the vdcm

On Thu, Oct 08, 2020 at 06:22:31PM -0700, Raj, Ashok wrote:

> Not randomly put there Jason :-).. There is a good reason for it. 

Sure the PASID value being associated with the IRQ make sense, but
combining that register with the interrupt mask is just a compltely
random thing to do.

If this HW was using MSI-X PASID would have been given its own
register.

Jason