linux-kernel - Re: [patch V3 16/22] genirq/msi: Provide new domain id based interfaces for freeing interrupts

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Date:   Mon, 16 Jan 2023 19:11:32 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     David Woodhouse <dwmw2@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Juergen Gross <jgross@...e.com>,
        xen-devel <xen-devel@...ts.xen.org>
Cc:     x86@...nel.org, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.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>,
        Dave Jiang <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Ashok Raj <ashok.raj@...el.com>, Jon Mason <jdmason@...zu.us>,
        Allen Hubbe <allenbh@...il.com>
Subject: Re: [patch V3 16/22] genirq/msi: Provide new domain id based
 interfaces for freeing interrupts

David!

On Mon, Jan 16 2023 at 17:35, Thomas Gleixner wrote:
> On Mon, Jan 16 2023 at 09:56, David Woodhouse wrote:
>
> This is just wrong. I need to taxi my grandson. Will have a look
> afterwards.

There are three 'tglx missed to fixup XEN' problems:

 - b2bdda205c0c ("PCI/MSI: Let the MSI core free descriptors")

   This requires the MSI_FLAG_FREE_MSI_DESCS flag to be set in the XEN
   MSI domain info


 - 2f2940d16823 ("genirq/msi: Remove filter from msi_free_descs_free_range()")

   This requires the 'desc->irq = 0' disassociation on teardown.


 - ffd84485e6be ("PCI/MSI: Let the irq code handle sysfs groups")

   Lacks a flag in the XEN MSI domain info as well.

Combo patch below.

Thanks,

        tglx
---
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -392,6 +392,7 @@ static void xen_teardown_msi_irqs(struct
 	msi_for_each_desc(msidesc, &dev->dev, MSI_DESC_ASSOCIATED) {
 		for (i = 0; i < msidesc->nvec_used; i++)
 			xen_destroy_irq(msidesc->irq + i);
+		msidesc->irq = 0;
 	}
 }
 
@@ -434,6 +435,7 @@ static struct msi_domain_ops xen_pci_msi
 
 static struct msi_domain_info xen_pci_msi_domain_info = {
 	.ops			= &xen_pci_msi_domain_ops,
+	.flags			= MSI_FLAG_FREE_MSI_DESCS | MSI_FLAG_DEV_SYSFS,
 };
 
 /*