linux-kernel - Re: [patch 21/33] genirq/msi: Provide msi_domain_alloc_irq

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Date:   Fri, 18 Nov 2022 14:59:39 -0800
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
CC:     <x86@...nel.org>, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>, <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        "Marc Zyngier" <maz@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Dave Jiang <dave.jiang@...el.com>,
        "Alex Williamson" <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Ashok Raj <ashok.raj@...el.com>, Jon Mason <jdmason@...zu.us>,
        Allen Hubbe <allenbh@...il.com>,
        "Ahmed S. Darwish" <darwi@...utronix.de>
Subject: Re: [patch 21/33] genirq/msi: Provide msi_domain_alloc_irq_at()

Hi Thomas,

On 11/18/2022 2:31 PM, Thomas Gleixner wrote:
> On Fri, Nov 18 2022 at 10:18, Reinette Chatre wrote:
>>> @@ -141,7 +141,7 @@ static int msi_insert_desc(struct device *dev, struct msi_desc *desc,
>>>  		if (ret)
>>>  			goto fail;
>>>  
>>> -		desc->msi_index = index;
>>> +		desc->msi_index = index - baseidx;
>>
>> Could msi_desc->msi_index be made bigger? The hardware I am testing
>> on claims to support more IMS entries than what the u16 can
>> accommodate.
> 
> Sure that's trivial. How big does it claim it is?

2048

> I assume your sequence is:
> 
>   pci_ims_alloc();
>   request_irq();        <- This creates it
>   free_irq();           <- This removes it
>   pci_ims_free();
> 
> Right?

No. My mistake. Sorry for the noise.

Reinette