PCI: Add msi_controller setup_irqs() method for special multivector setup

Add a msi_controller setup_irqs() method so MSI chip providers can
implement their own multivector MSI setup.

[bhelgaas: changelog]
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Pratyush Anand <pratyush.anand@gmail.com>

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index d449714..74319f4 100644 (file)
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -105,9 +105,12 @@ void __weak arch_teardown_msi_irq(unsigned int irq)
 
 int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 {
+       struct msi_controller *chip = dev->bus->msi;
        struct msi_desc *entry;
        int ret;
 
+       if (chip && chip->setup_irqs)
+               return chip->setup_irqs(chip, dev, nvec, type);
        /*
         * If an architecture wants to support multiple MSI, it needs to
         * override arch_setup_msi_irqs()

diff --git a/include/linux/msi.h b/include/linux/msi.h
index ad939d0..0be5db1 100644 (file)
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -163,6 +163,8 @@ struct msi_controller {
 
        int (*setup_irq)(struct msi_controller *chip, struct pci_dev *dev,
                         struct msi_desc *desc);
+       int (*setup_irqs)(struct msi_controller *chip, struct pci_dev *dev,
+                         int nvec, int type);
        void (*teardown_irq)(struct msi_controller *chip, unsigned int irq);
 };