linux-kernel - Re: [PATCH 1/9] iommu/vt-d: Allow interrupts from the entire bus for aliased devices

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Message-ID: <398e6a0a-9cbd-c218-e20e-ed91f74a653d@deltatee.com>
Date:   Fri, 1 Feb 2019 10:27:29 -0700
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     linux-kernel@...r.kernel.org, linux-ntb@...glegroups.com,
        linux-pci@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-kselftest@...r.kernel.org, Jon Mason <jdmason@...zu.us>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Allen Hubbe <allenbh@...il.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Eric Pilmore <epilmore@...aio.com>,
        David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH 1/9] iommu/vt-d: Allow interrupts from the entire bus for
 aliased devices



On 2019-02-01 9:44 a.m., Joerg Roedel wrote:
> On Thu, Jan 31, 2019 at 11:56:48AM -0700, Logan Gunthorpe wrote:
>> @@ -394,6 +402,10 @@ static int set_msi_sid(struct irte *irte, struct pci_dev *dev)
>>  		set_irte_sid(irte, SVT_VERIFY_BUS, SQ_ALL_16,
>>  			     PCI_DEVID(PCI_BUS_NUM(data.alias),
>>  				       dev->bus->number));
>> +	else if (data.count >= 2 && data.busmatch_count == data.count)
>> +		set_irte_sid(irte, SVT_VERIFY_BUS, SQ_ALL_16,
>> +			     PCI_DEVID(dev->bus->number,
>> +				       dev->bus->number));
> 
> The dev->bus->number argument for the devfn parameter of PCI_DEVID is
> not needed, right?

Oh, yes. I think you are right.

> Also, this requires at least a comment to document that special case.

I'll add a comment for v2.

Thanks for the review!

Logan