linux-kernel - Re: [PATCH v6 02/29] x86/apic: Add irq_cfg::delivery

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Message-ID: <20220512002658.GB16273@ranerica-svr.sc.intel.com>
Date:   Wed, 11 May 2022 17:26:58 -0700
From:   Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     x86@...nel.org, Tony Luck <tony.luck@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Joerg Roedel <joro@...tes.org>,
        Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
        David Woodhouse <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Nicholas Piggin <npiggin@...il.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Ricardo Neri <ricardo.neri@...el.com>,
        iommu@...ts.linux-foundation.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 02/29] x86/apic: Add irq_cfg::delivery_mode

On Fri, May 06, 2022 at 09:53:54PM +0200, Thomas Gleixner wrote:
> On Thu, May 05 2022 at 16:59, Ricardo Neri wrote:
> > Currently, the delivery mode of all interrupts is set to the mode of the
> > APIC driver in use. There are no restrictions in hardware to configure the
> > delivery mode of each interrupt individually. Also, certain IRQs need
> > to be
> 
> s/IRQ/interrupt/ Changelogs can do without acronyms.

Sure. I will sanitize all the changelogs to remove acronyms.

> 
> > configured with a specific delivery mode (e.g., NMI).
> >
> > Add a new member, delivery_mode, to struct irq_cfg. Subsequent changesets
> > will update every irq_domain to set the delivery mode of each IRQ to that
> > specified in its irq_cfg data.
> >
> > To keep the current behavior, when allocating an IRQ in the root
> > domain
> 
> The root domain does not allocate an interrupt. The root domain
> allocates a vector for an interrupt. There is a very clear and technical
> destinction. Can you please be more careful about the wording?

I will review the wording in the changelogs.

> 
> > --- a/arch/x86/kernel/apic/vector.c
> > +++ b/arch/x86/kernel/apic/vector.c
> > @@ -567,6 +567,7 @@ static int x86_vector_alloc_irqs(struct irq_domain *domain, unsigned int virq,
> >  		irqd->chip_data = apicd;
> >  		irqd->hwirq = virq + i;
> >  		irqd_set_single_target(irqd);
> > +
> 
> Stray newline.

Sorry! I will remove it.
> 
> >  		/*
> >  		 * Prevent that any of these interrupts is invoked in
> >  		 * non interrupt context via e.g. generic_handle_irq()
> > @@ -577,6 +578,14 @@ static int x86_vector_alloc_irqs(struct irq_domain *domain, unsigned int virq,
> >  		/* Don't invoke affinity setter on deactivated interrupts */
> >  		irqd_set_affinity_on_activate(irqd);
> >  
> > +		/*
> > +		 * Initialize the delivery mode of this irq to match the
> 
> s/irq/interrupt/

I will make this change.

Thanks and BR,
Ricardo

> 
> > +		 * default delivery mode of the APIC. Children irq domains
> > +		 * may take the delivery mode from the individual irq
> > +		 * configuration rather than from the APIC driver.
> > +		 */
> > +		apicd->hw_irq_cfg.delivery_mode = apic->delivery_mode;
> > +
> >  		/*
> >  		 * Legacy vectors are already assigned when the IOAPIC
> >  		 * takes them over. They stay on the same vector. This is