linux-kernel - [patch 05/10] genirq/msi: Add domain info flag MSI_FLAG_CAN

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Message-ID: <20211127000918.779751933@linutronix.de>
Date:   Sat, 27 Nov 2021 02:25:05 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Bjorn Helgaas <helgaas@...nel.org>, Marc Zygnier <maz@...nel.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Megha Dey <megha.dey@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Andrew Cooper <amc96@....ac.uk>,
        Juergen Gross <jgross@...e.com>, linux-pci@...r.kernel.org,
        xen-devel@...ts.xenproject.org
Subject: [patch 05/10] genirq/msi: Add domain info flag MSI_FLAG_CAN_EXPAND

Not all MSI domains support runtime expansions of PCI/MSI-X vectors. Add a
domain flag so implementations can opt in.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 include/linux/msi.h |    2 ++
 1 file changed, 2 insertions(+)

--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -494,6 +494,8 @@ enum {
 	MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS	= (1 << 9),
 	/* Free MSI descriptors */
 	MSI_FLAG_FREE_MSI_DESCS		= (1 << 10),
+	/* MSI vectors can be expanded after initial setup */
+	MSI_FLAG_CAN_EXPAND		= (1 << 11),
 };
 
 int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,