linux-kernel - Re: [patch 09/22] MIPS: Octeon: Use arch_setup_msi

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Message-ID: <20211129102116.GA6158@alpha.franken.de>
Date:   Mon, 29 Nov 2021 11:21:16 +0100
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Marc Zygnier <maz@...nel.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Megha Dey <megha.dey@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, linux-pci@...r.kernel.org,
        linux-mips@...r.kernel.org, Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        linuxppc-dev@...ts.ozlabs.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        sparclinux@...r.kernel.org, x86@...nel.org,
        xen-devel@...ts.xenproject.org, ath11k@...ts.infradead.org,
        Wei Liu <wei.liu@...nel.org>, linux-hyperv@...r.kernel.org,
        Juergen Gross <jgross@...e.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>
Subject: Re: [patch 09/22] MIPS: Octeon: Use arch_setup_msi_irq()

On Sat, Nov 27, 2021 at 02:18:48AM +0100, Thomas Gleixner wrote:
> The core code provides the same loop code except for the MSI-X reject. Move
> that to arch_setup_msi_irq() and remove the duplicated code.
> 
> No functional change.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> Cc: linux-mips@...r.kernel.org
> ---
>  arch/mips/pci/msi-octeon.c |   32 +++-----------------------------
>  1 file changed, 3 insertions(+), 29 deletions(-)
> 
> --- a/arch/mips/pci/msi-octeon.c
> +++ b/arch/mips/pci/msi-octeon.c
> @@ -68,6 +68,9 @@ int arch_setup_msi_irq(struct pci_dev *d
>  	u64 search_mask;
>  	int index;
>  
> +	if (desc->pci.msi_attrib.is_msix)
> +		return -EINVAL;
> +
>  	/*
>  	 * Read the MSI config to figure out how many IRQs this device
>  	 * wants.  Most devices only want 1, which will give
> @@ -182,35 +185,6 @@ int arch_setup_msi_irq(struct pci_dev *d
>  	return 0;
>  }
>  
> -int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> -{
> -	struct msi_desc *entry;
> -	int ret;
> -
> -	/*
> -	 * MSI-X is not supported.
> -	 */
> -	if (type == PCI_CAP_ID_MSIX)
> -		return -EINVAL;
> -
> -	/*
> -	 * If an architecture wants to support multiple MSI, it needs to
> -	 * override arch_setup_msi_irqs()
> -	 */
> -	if (type == PCI_CAP_ID_MSI && nvec > 1)
> -		return 1;
> -
> -	for_each_pci_msi_entry(entry, dev) {
> -		ret = arch_setup_msi_irq(dev, entry);
> -		if (ret < 0)
> -			return ret;
> -		if (ret > 0)
> -			return -ENOSPC;
> -	}
> -
> -	return 0;
> -}
> -
>  /**
>   * Called when a device no longer needs its MSI interrupts. All
>   * MSI interrupts for the device are freed.

Acked-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]