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Message-ID: <871qnunycr.ffs@tglx>
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,
};
/*
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