linux-kernel - Re: [patch V2 23/46] irqdomain/msi: Provide DOMAIN_BUS_VMD

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Message-ID: <875z952l6w.wl-maz@kernel.org>
Date:   Wed, 26 Aug 2020 21:42:31 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Joerg Roedel <joro@...tes.org>,
        iommu@...ts.linux-foundation.org, linux-hyperv@...r.kernel.org,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Jon Derrick <jonathan.derrick@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Wei Liu <wei.liu@...nel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Steve Wahl <steve.wahl@....com>,
        Dimitri Sivanich <sivanich@....com>,
        Russ Anderson <rja@....com>, linux-pci@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        xen-devel@...ts.xenproject.org, Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Megha Dey <megha.dey@...el.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jacob Pan <jacob.jun.pan@...el.com>,
        Baolu Lu <baolu.lu@...el.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Dan Williams <dan.j.williams@...el.com>
Subject: Re: [patch V2 23/46] irqdomain/msi: Provide DOMAIN_BUS_VMD_MSI

On Wed, 26 Aug 2020 12:16:51 +0100,
Thomas Gleixner <tglx@...utronix.de> wrote:
> 
> From: Thomas Gleixner <tglx@...utronix.de>
> 
> PCI devices behind a VMD bus are not subject to interrupt remapping, but
> the irq domain for VMD MSI cannot be distinguished from a regular PCI/MSI
> irq domain.
> 
> Add a new domain bus token and allow it in the bus token check in
> msi_check_reservation_mode() to keep the functionality the same once VMD
> uses this token.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> 
> ---
>  include/linux/irqdomain.h |    1 +
>  kernel/irq/msi.c          |    7 ++++++-
>  2 files changed, 7 insertions(+), 1 deletion(-)
> 
> --- a/include/linux/irqdomain.h
> +++ b/include/linux/irqdomain.h
> @@ -84,6 +84,7 @@ enum irq_domain_bus_token {
>  	DOMAIN_BUS_FSL_MC_MSI,
>  	DOMAIN_BUS_TI_SCI_INTA_MSI,
>  	DOMAIN_BUS_WAKEUP,
> +	DOMAIN_BUS_VMD_MSI,
>  };
>  
>  /**
> --- a/kernel/irq/msi.c
> +++ b/kernel/irq/msi.c
> @@ -370,8 +370,13 @@ static bool msi_check_reservation_mode(s
>  {
>  	struct msi_desc *desc;
>  
> -	if (domain->bus_token != DOMAIN_BUS_PCI_MSI)
> +	switch(domain->bus_token) {
> +	case DOMAIN_BUS_PCI_MSI:
> +	case DOMAIN_BUS_VMD_MSI:
> +		break;
> +	default:
>  		return false;
> +	}
>  
>  	if (!(info->flags & MSI_FLAG_MUST_REACTIVATE))
>  		return false;

Acked-by: Marc Zyngier <maz@...nel.org>

	M.

-- 
Without deviation from the norm, progress is not possible.