linux-kernel - [PATCH] PCI: export and use pci_msi_get

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Date:   Wed, 22 Apr 2020 19:58:15 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     linux-pci@...r.kernel.org
Cc:     linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wei Liu <wei.liu@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Andrew Murray <amurray@...goodpenguin.co.uk>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Allison Randal <allison@...utok.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Enrico Weigelt <info@...ux.net>
Subject: [PATCH] PCI: export and use pci_msi_get_hwirq in pci-hyperv.c

There is a functionally identical function in pci-hyperv.c. Drop it and
use pci_msi_get_hwirq instead.

This requires exporting pci_msi_get_hwirq and declaring it in msi.h.

No functional change intended.

Signed-off-by: Wei Liu <wei.liu@...nel.org>
---
 arch/x86/include/asm/msi.h          | 4 ++++
 arch/x86/kernel/apic/msi.c          | 5 +++--
 drivers/pci/controller/pci-hyperv.c | 8 +-------
 3 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/arch/x86/include/asm/msi.h b/arch/x86/include/asm/msi.h
index 25ddd0916bb2..353b80122b2e 100644
--- a/arch/x86/include/asm/msi.h
+++ b/arch/x86/include/asm/msi.h
@@ -11,4 +11,8 @@ int pci_msi_prepare(struct irq_domain *domain, struct device *dev, int nvec,
 
 void pci_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc);
 
+struct msi_domain_info;
+irq_hw_number_t pci_msi_get_hwirq(struct msi_domain_info *info,
+				  msi_alloc_info_t *arg);
+
 #endif /* _ASM_X86_MSI_H */
diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
index 159bd0cb8548..56dcdd912564 100644
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -204,11 +204,12 @@ void native_teardown_msi_irq(unsigned int irq)
 	irq_domain_free_irqs(irq, 1);
 }
 
-static irq_hw_number_t pci_msi_get_hwirq(struct msi_domain_info *info,
-					 msi_alloc_info_t *arg)
+irq_hw_number_t pci_msi_get_hwirq(struct msi_domain_info *info,
+				  msi_alloc_info_t *arg)
 {
 	return arg->msi_hwirq;
 }
+EXPORT_SYMBOL_GPL(pci_msi_get_hwirq);
 
 int pci_msi_prepare(struct irq_domain *domain, struct device *dev, int nvec,
 		    msi_alloc_info_t *arg)
diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index e6020480a28b..2b4a6452095f 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -1520,14 +1520,8 @@ static struct irq_chip hv_msi_irq_chip = {
 	.irq_unmask		= hv_irq_unmask,
 };
 
-static irq_hw_number_t hv_msi_domain_ops_get_hwirq(struct msi_domain_info *info,
-						   msi_alloc_info_t *arg)
-{
-	return arg->msi_hwirq;
-}
-
 static struct msi_domain_ops hv_msi_ops = {
-	.get_hwirq	= hv_msi_domain_ops_get_hwirq,
+	.get_hwirq	= pci_msi_get_hwirq,
 	.msi_prepare	= pci_msi_prepare,
 	.set_desc	= pci_msi_set_desc,
 	.msi_free	= hv_msi_free,
-- 
2.20.1