linux-kernel - Re: [patch 14/39] PCI/MSI: Let the MSI core free descriptors

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Message-ID: <20221116161512.GA1114737@bhelgaas>
Date:   Wed, 16 Nov 2022 10:15:12 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, 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>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [patch 14/39] PCI/MSI: Let the MSI core free descriptors

On Fri, Nov 11, 2022 at 02:54:37PM +0100, Thomas Gleixner wrote:
> From: Ahmed S. Darwish <darwi@...utronix.de>
> 
> Let the core do the freeing of descriptors and just keep it around for the
> legacy case.
> 
> Signed-off-by: Ahmed S. Darwish <darwi@...utronix.de>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

> ---
>  drivers/pci/msi/irqdomain.c |   10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> --- a/drivers/pci/msi/irqdomain.c
> +++ b/drivers/pci/msi/irqdomain.c
> @@ -24,11 +24,12 @@ void pci_msi_teardown_msi_irqs(struct pc
>  	struct irq_domain *domain;
>  
>  	domain = dev_get_msi_domain(&dev->dev);
> -	if (domain && irq_domain_is_hierarchy(domain))
> +	if (domain && irq_domain_is_hierarchy(domain)) {
>  		msi_domain_free_irqs_descs_locked(domain, &dev->dev);
> -	else
> +	} else {
>  		pci_msi_legacy_teardown_msi_irqs(dev);
> -	msi_free_msi_descs(&dev->dev);
> +		msi_free_msi_descs(&dev->dev);
> +	}
>  }
>  
>  /**
> @@ -170,6 +171,9 @@ struct irq_domain *pci_msi_create_irq_do
>  	if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
>  		pci_msi_domain_update_chip_ops(info);
>  
> +	/* Let the core code free MSI descriptors when freeing interrupts */
> +	info->flags |= MSI_FLAG_FREE_MSI_DESCS;
> +
>  	info->flags |= MSI_FLAG_ACTIVATE_EARLY | MSI_FLAG_DEV_SYSFS;
>  	if (IS_ENABLED(CONFIG_GENERIC_IRQ_RESERVATION_MODE))
>  		info->flags |= MSI_FLAG_MUST_REACTIVATE;
>