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PCI: Introduce new MSI chip infrastructure

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The new struct msi_chip is used to associated an MSI controller with a
PCI bus. It is automatically handed down from the root to its children
during bus enumeration.

This patch provides default (weak) implementations for the architecture-
specific MSI functions (arch_setup_msi_irq(), arch_teardown_msi_irq()
and arch_msi_check_device()) which check if a PCI device's bus has an
attached MSI chip and forward the call appropriately.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Daniel Price <daniel.price@gmail.com>
Tested-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Thierry Reding
2013-08-09 22:27:08 +02:00
committed by Jason Cooper
parent ebd97be635
commit 0cbdcfcf42
4 changed files with 38 additions and 2 deletions
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11
include/linux/msi.h
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@@ -65,4 +65,15 @@ void arch_restore_msi_irqs(struct pci_dev *dev, int irq);
void default_teardown_msi_irqs(struct pci_dev *dev);
void default_restore_msi_irqs(struct pci_dev *dev, int irq);
struct msi_chip {
struct module *owner;
struct device *dev;
int (*setup_irq)(struct msi_chip *chip, struct pci_dev *dev,
struct msi_desc *desc);
void (*teardown_irq)(struct msi_chip *chip, unsigned int irq);
int (*check_device)(struct msi_chip *chip, struct pci_dev *dev,
int nvec, int type);
};
#endif /* LINUX_MSI_H */