linux-kernel - [PATCH RFC v1 15/18] x86/apic/msi: export pci_msi_get

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Date:   Mon, 14 Sep 2020 11:59:24 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Linux on Hyper-V List <linux-hyperv@...r.kernel.org>
Cc:     virtualization@...ts.linux-foundation.org,
        Linux Kernel List <linux-kernel@...r.kernel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Vineeth Pillai <viremana@...ux.microsoft.com>,
        Sunil Muthuswamy <sunilmut@...rosoft.com>,
        Nuno Das Neves <nudasnev@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
        "H. Peter Anvin" <hpa@...or.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Andy Lutomirski <luto@...nel.org>
Subject: [PATCH RFC v1 15/18] x86/apic/msi: export pci_msi_get_hwirq

Linux will implement an MSI domain for MSI/MSI-X when running as root on
Microsoft Hypervisor. It will be using this function to reduce code
duplication.

Signed-off-by: Wei Liu <wei.liu@...nel.org>
---
 arch/x86/include/asm/msi.h | 3 +++
 arch/x86/kernel/apic/msi.c | 3 ++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/msi.h b/arch/x86/include/asm/msi.h
index 25ddd0916bb2..5c0e102c03ec 100644
--- a/arch/x86/include/asm/msi.h
+++ b/arch/x86/include/asm/msi.h
@@ -11,4 +11,7 @@ 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 c2b2911feeef..dc9693a73933 100644
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -205,11 +205,12 @@ 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,
+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)
-- 
2.20.1