linux-kernel - Re: [patch V2 15/46] x86/irq: Consolidate DMAR irq allocation

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Date:   Thu, 27 Aug 2020 17:12:44 -0700
From:   "Dey, Megha" <megha.dey@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
CC:     <x86@...nel.org>, Joerg Roedel <joro@...tes.org>,
        <iommu@...ts.linux-foundation.org>, <linux-hyperv@...r.kernel.org>,
        "Haiyang Zhang" <haiyangz@...rosoft.com>,
        Jon Derrick <jonathan.derrick@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Wei Liu <wei.liu@...nel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Steve Wahl <steve.wahl@....com>,
        Dimitri Sivanich <sivanich@....com>,
        "Russ Anderson" <rja@....com>, <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        <xen-devel@...ts.xenproject.org>, Juergen Gross <jgross@...e.com>,
        "Boris Ostrovsky" <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jacob Pan <jacob.jun.pan@...el.com>,
        Baolu Lu <baolu.lu@...el.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Dan Williams <dan.j.williams@...el.com>
Subject: Re: [patch V2 15/46] x86/irq: Consolidate DMAR irq allocation

Hi Thomas,

On 8/26/2020 1:50 PM, Thomas Gleixner wrote:
> On Wed, Aug 26 2020 at 20:32, Thomas Gleixner wrote:
>> On Wed, Aug 26 2020 at 09:50, Megha Dey wrote:
>>>> @@ -329,15 +329,15 @@ static struct irq_chip dmar_msi_controll
>>>>    static irq_hw_number_t dmar_msi_get_hwirq(struct msi_domain_info *info,
>>>>    					  msi_alloc_info_t *arg)
>>>>    {
>>>> -	return arg->dmar_id;
>>>> +	return arg->hwirq;
>>> Shouldn't this return the arg->devid which gets set in dmar_alloc_hwirq?
>> Indeed.
> But for simplicity we can set arg->hwirq to the dmar id right in the
> alloc function and then once the generic ops are enabled remove the dmar
> callback completely
True, can get rid of more code that way.