[Xen-devel] [PATCH v2 08/22] x86/MSI: Use MSI chip framework to configure MSI/MSI-X irq

[Yijing Wang <wangyijing@xxxxxxxxxx>]

Use MSI chip framework instead of arch MSI functions to configure
MSI/MSI-X irq. So we can manage MSI/MSI-X irq in a unified framework.

Signed-off-by: Yijing Wang <wangyijing@xxxxxxxxxx>
---
 arch/x86/include/asm/pci.h     |    1 +
 arch/x86/kernel/apic/io_apic.c |   12 ++++++++++++
 2 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index 0892ea0..878a06d 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -101,6 +101,7 @@ void native_teardown_msi_irq(unsigned int irq);
 void native_restore_msi_irqs(struct pci_dev *dev);
 int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc,
                  unsigned int irq_base, unsigned int irq_offset);
+extern struct msi_chip *x86_msi_chip;
 #else
 #define native_setup_msi_irqs          NULL
 #define native_teardown_msi_irq                NULL
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 2a2ec28..882b95e 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3337,6 +3337,18 @@ int default_setup_hpet_msi(unsigned int irq, unsigned 
int id)
 }
 #endif
 
+struct msi_chip apic_msi_chip = {
+       .setup_irqs = native_setup_msi_irqs,
+       .teardown_irq = native_teardown_msi_irq,
+};
+
+struct msi_chip *arch_find_msi_chip(struct pci_dev *dev)
+{
+       return x86_msi_chip;
+}
+
+struct msi_chip *x86_msi_chip = &apic_msi_chip;
+
 #endif /* CONFIG_PCI_MSI */
 /*
  * Hypertransport interrupt support
-- 
1.7.1


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