linux-kernel - Re: [patch V2 15/46] x86/irq: Consolidate DMAR irq allocation

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Date:   Wed, 26 Aug 2020 09:50:27 -0700
From:   "Dey, Megha" <megha.dey@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
CC:     <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>,
        Marc Zyngier <maz@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        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 15/46] x86/irq: Consolidate DMAR irq allocation

Hi Thomas,

On 8/26/2020 4:16 AM, Thomas Gleixner wrote:
> From: Thomas Gleixner <tglx@...utronix.de>
>
> None of the DMAR specific fields are required.
>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
>
> ---
>   arch/x86/include/asm/hw_irq.h |    6 ------
>   arch/x86/kernel/apic/msi.c    |   10 +++++-----
>   2 files changed, 5 insertions(+), 11 deletions(-)
>
> --- a/arch/x86/include/asm/hw_irq.h
> +++ b/arch/x86/include/asm/hw_irq.h
> @@ -83,12 +83,6 @@ struct irq_alloc_info {
>   			irq_hw_number_t	msi_hwirq;
>   		};
>   #endif
> -#ifdef	CONFIG_DMAR_TABLE
> -		struct {
> -			int		dmar_id;
> -			void		*dmar_data;
> -		};
> -#endif
>   #ifdef	CONFIG_X86_UV
>   		struct {
>   			int		uv_limit;
> --- a/arch/x86/kernel/apic/msi.c
> +++ b/arch/x86/kernel/apic/msi.c
> @@ -329,15 +329,15 @@ static struct irq_chip dmar_msi_controll
>   static irq_hw_number_t dmar_msi_get_hwirq(struct msi_domain_info *info,
>   					  msi_alloc_info_t *arg)
>   {
> -	return arg->dmar_id;
> +	return arg->hwirq;

Shouldn't this return the arg->devid which gets set in dmar_alloc_hwirq?

-Megha

>   }
>   
>   static int dmar_msi_init(struct irq_domain *domain,
>   			 struct msi_domain_info *info, unsigned int virq,
>   			 irq_hw_number_t hwirq, msi_alloc_info_t *arg)
>   {
> -	irq_domain_set_info(domain, virq, arg->dmar_id, info->chip, NULL,
> -			    handle_edge_irq, arg->dmar_data, "edge");
> +	irq_domain_set_info(domain, virq, arg->devid, info->chip, NULL,
> +			    handle_edge_irq, arg->data, "edge");
>   
>   	return 0;
>   }
> @@ -384,8 +384,8 @@ int dmar_alloc_hwirq(int id, int node, v
>   
>   	init_irq_alloc_info(&info, NULL);
>   	info.type = X86_IRQ_ALLOC_TYPE_DMAR;
> -	info.dmar_id = id;
> -	info.dmar_data = arg;
> +	info.devid = id;
> +	info.data = arg;
>   
>   	return irq_domain_alloc_irqs(domain, 1, node, &info);
>   }
>
>