linux-kernel - Re: [patch 2/3] PCI/MSI: Set MSI_FLAG_MUST

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Date:   Tue, 17 Oct 2017 14:28:39 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
cc:     Dexuan Cui <decui@...rosoft.com>, x86@...nel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Marc Zyngier <marc.zyngier@....com>,
        KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        linux-pci@...r.kernel.org, devel@...uxdriverproject.org,
        Josh Poulson <jopoulso@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Simon Xiao <sixiao@...rosoft.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Mihai Costache <v-micos@...rosoft.com>,
        Jork Loeser <Jork.Loeser@...rosoft.com>
Subject: Re: [patch 2/3] PCI/MSI: Set MSI_FLAG_MUST_REACTIVATE in core code

On Tue, 17 Oct 2017, Thomas Gleixner wrote:

> If interrupt reservation mode is enabled then the PCI/MSI interrupts must
> be reactivated after early activation.
> 
> Make sure that all callers of pci_msi_create_irq_domain() have the
> MSI_FLAG_MUST_REACTIVATE set when reservation mode is enabled.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
>  drivers/pci/msi.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
> --- a/drivers/pci/msi.c
> +++ b/drivers/pci/msi.c
> @@ -1441,6 +1441,8 @@ struct irq_domain *pci_msi_create_irq_do
>  		pci_msi_domain_update_chip_ops(info);
>  
>  	info->flags |= MSI_FLAG_ACTIVATE_EARLY;
> +	if (IS_ENABLED(CONFIG_GENERIC_IRQ_RESERVATION))

Bah. quilt refresh seems overrated. Correct patch below.

Thanks,

	tglx

8<----------------

--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -1441,6 +1441,8 @@ struct irq_domain *pci_msi_create_irq_do
 		pci_msi_domain_update_chip_ops(info);
 
 	info->flags |= MSI_FLAG_ACTIVATE_EARLY;
+	if (IS_ENABLED(CONFIG_GENERIC_IRQ_RESERVATION_MODE))
+		info->flags |= MSI_FLAG_MUST_REACTIVATE;
 
 	domain = msi_create_irq_domain(fwnode, info, parent);
 	if (!domain)