linux-kernel - [patch 08/39] genirq/msi: Provide msi_domain_ops::post

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Date:   Fri, 11 Nov 2022 14:54:27 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.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>,
        Michael Ellerman <mpe@...erman.id.au>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        linuxppc-dev@...ts.ozlabs.org,
        "Ahmed S. Darwish" <darwi@...utronix.de>,
        Reinette Chatre <reinette.chatre@...el.com>
Subject: [patch 08/39] genirq/msi: Provide msi_domain_ops::post_free()

To prepare for removing the exposure of __msi_domain_free_irqs() provide a
post_free() callback in the MSI domain ops which can be used to solve
the problem of the only user of __msi_domain_free_irqs() in arch/powerpc.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 include/linux/msi.h |    4 ++++
 kernel/irq/msi.c    |    2 ++
 2 files changed, 6 insertions(+)

--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -315,6 +315,8 @@ struct msi_domain_info;
  *			function.
  * @domain_free_irqs:	Optional function to override the default free
  *			function.
+ * @msi_post_free:	Optional function which is invoked after freeing
+ *			all interrupts.
  *
  * @get_hwirq, @msi_init and @msi_free are callbacks used by the underlying
  * irqdomain.
@@ -359,6 +361,8 @@ struct msi_domain_ops {
 					     struct device *dev, int nvec);
 	void		(*domain_free_irqs)(struct irq_domain *domain,
 					    struct device *dev);
+	void		(*msi_post_free)(struct irq_domain *domain,
+					 struct device *dev);
 };
 
 /**
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -1026,6 +1026,8 @@ void msi_domain_free_irqs_descs_locked(s
 	lockdep_assert_held(&dev->msi.data->mutex);
 
 	ops->domain_free_irqs(domain, dev);
+	if (ops->msi_post_free)
+		ops->msi_post_free(domain, dev);
 	msi_domain_free_msi_descs(info, dev);
 }