linux-kernel - Re: [patch 14/33] PCI/MSI: Remove unused pci_dev_has_special_msi

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Date:   Wed, 16 Nov 2022 14:13:27 -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>
Subject: Re: [patch 14/33] PCI/MSI: Remove unused
 pci_dev_has_special_msi_domain()

On Fri, Nov 11, 2022 at 02:58:33PM +0100, Thomas Gleixner wrote:
> The check for special MSI domains like VMD which prevents the interrupt
> remapping code to overwrite device::msi::domain is not longer required and
> has been replaced by an x86 specific version which is aware of MSI parent
> domains.
> 
> Remove it.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

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

> ---
>  drivers/pci/msi/irqdomain.c |   21 ---------------------
>  include/linux/msi.h         |    2 --
>  2 files changed, 23 deletions(-)
> 
> --- a/drivers/pci/msi/irqdomain.c
> +++ b/drivers/pci/msi/irqdomain.c
> @@ -414,24 +414,3 @@ struct irq_domain *pci_msi_get_device_do
>  					     DOMAIN_BUS_PCI_MSI);
>  	return dom;
>  }
> -
> -/**
> - * pci_dev_has_special_msi_domain - Check whether the device is handled by
> - *				    a non-standard PCI-MSI domain
> - * @pdev:	The PCI device to check.
> - *
> - * Returns: True if the device irqdomain or the bus irqdomain is
> - * non-standard PCI/MSI.
> - */
> -bool pci_dev_has_special_msi_domain(struct pci_dev *pdev)
> -{
> -	struct irq_domain *dom = dev_get_msi_domain(&pdev->dev);
> -
> -	if (!dom)
> -		dom = dev_get_msi_domain(&pdev->bus->dev);
> -
> -	if (!dom)
> -		return true;
> -
> -	return dom->bus_token != DOMAIN_BUS_PCI_MSI;
> -}
> --- a/include/linux/msi.h
> +++ b/include/linux/msi.h
> @@ -599,8 +599,6 @@ struct irq_domain *pci_msi_create_irq_do
>  					     struct irq_domain *parent);
>  u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev);
>  struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev);
> -bool pci_dev_has_special_msi_domain(struct pci_dev *pdev);
> -
>  #endif /* CONFIG_GENERIC_MSI_IRQ */
>  
>  #endif /* LINUX_MSI_H */
>