linux-kernel - RE: [patch 17/20] platform-msi: Switch to the domain id aware MSI interfaces

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Date:   Mon, 21 Nov 2022 03:42:20 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
CC:     "x86@...nel.org" <x86@...nel.org>, Joerg Roedel <joro@...tes.org>,
        "Will Deacon" <will@...nel.org>,
        "linux-pci@...r.kernel.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>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        "Raj, Ashok" <ashok.raj@...el.com>, Jon Mason <jdmason@...zu.us>,
        Allen Hubbe <allenbh@...il.com>,
        "Ahmed S. Darwish" <darwi@...utronix.de>,
        "Chatre, Reinette" <reinette.chatre@...el.com>
Subject: RE: [patch 17/20] platform-msi: Switch to the domain id aware MSI
 interfaces

> From: Thomas Gleixner <tglx@...utronix.de>
> Sent: Friday, November 18, 2022 8:27 PM
> 
> On Fri, Nov 18 2022 at 08:53, Kevin Tian wrote:
> >> From: Thomas Gleixner <tglx@...utronix.de>
> >>
> >> -	err = msi_domain_alloc_irqs(dev->msi.domain, dev, nvec);
> >> +	err = msi_domain_alloc_irqs_range(dev, MSI_DEFAULT_DOMAIN, 0,
> >> nvec - 1);
> >>  	if (err)
> >>  		platform_msi_free_priv_data(dev);
> >>
> >
> > Out of curiosity. Why don't we provide an unlocked version of
> > msi_domain_alloc_irqs_all()?
> 
> -ENOUSER

msi_domain_alloc_irqs() and msi_domain_alloc_irqs_descs_locked()
are a pair.

What I didn't get was why the unlocked invocation in this patch
is replaced by a range-based helper while the locked invocation
in previous patch16 was replaced by an all-based helper:

	if (domain && irq_domain_is_hierarchy(domain))
-		return msi_domain_alloc_irqs_descs_locked(domain, &dev->dev, nvec);
+		return msi_domain_alloc_irqs_all_locked(&dev->dev, MSI_DEFAULT_DOMAIN, nvec);

The reason could probably be marked out in the commit msg.