linux-kernel - RE: [patch V2 13/33] x86/apic/vector: Provide MSI parent domain

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Date:   Thu, 24 Nov 2022 01:10:55 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
CC:     "x86@...nel.org" <x86@...nel.org>, Joerg Roedel <joro@...tes.org>,
        "Will Deacon" <will@...nel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Lorenzo Pieralisi" <lorenzo.pieralisi@....com>,
        Marc Zyngier <maz@...nel.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Jason Gunthorpe <jgg@...lanox.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        "Raj, Ashok" <ashok.raj@...el.com>, Jon Mason <jdmason@...zu.us>,
        Allen Hubbe <allenbh@...il.com>
Subject: RE: [patch V2 13/33] x86/apic/vector: Provide MSI parent domain

> From: Thomas Gleixner <tglx@...utronix.de>
> Sent: Wednesday, November 23, 2022 9:42 PM
> 
> On Wed, Nov 23 2022 at 08:16, Kevin Tian wrote:
> >> From: Thomas Gleixner <tglx@...utronix.de>
> >> Sent: Monday, November 21, 2022 10:38 PM
> >> +
> >> +	/*
> >> +	 * Mask out the domain specific MSI feature flags which are not
> >> +	 * supported by the real parent.
> >> +	 */
> >> +	info->flags			&= pops->supported_flags;
> >> +	/* Enforce the required flags */
> >> +	info->flags			|=
> >> X86_VECTOR_MSI_FLAGS_REQUIRED;
> >> +
> >> +	/* This is always invoked from the top level MSI domain! */
> >> +	info->ops->msi_prepare		= x86_msi_prepare;
> >> +
> >> +	info->chip->irq_ack		= irq_chip_ack_parent;
> >> +	info->chip->irq_retrigger	= irq_chip_retrigger_hierarchy;
> >> +	info->chip->flags		|= IRQCHIP_SKIP_SET_WAKE |
> >> +					   IRQCHIP_AFFINITY_PRE_STARTUP;
> >
> > Above are executed twice for both IR and vector after next patch comes.
> > Could skip it for IR.
> 
> How so?
> 
> +static const struct msi_parent_ops dmar_msi_parent_ops = {
> +	.supported_flags	= X86_VECTOR_MSI_FLAGS_SUPPORTED |
> MSI_FLAG_MULTI_PCI_MSI,
> +	.prefix			= "IR-",
> +	.init_dev_msi_info	= msi_parent_init_dev_msi_info,
> +};
> 
> IR delegates the init to its parent domain, i.e. the vector domain. So
> there is no double invocation.
> 

oops. How come I read msi_parent_init_dev_msi_info() as
x86_init_dev_msi_info(). 😊