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>
int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
{
int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
{
+ struct msi_chip *chip = dev->bus->msi;
+ int err;
+
+ if (!chip || !chip->setup_irq)
+ return -EINVAL;
+
+ err = chip->setup_irq(chip, dev, desc);
+ if (err < 0)
+ return err;
+
+ irq_set_chip_data(desc->irq, chip);
+
+ return 0;
}
void __weak arch_teardown_msi_irq(unsigned int irq)
{
}
void __weak arch_teardown_msi_irq(unsigned int irq)
{
+ struct msi_chip *chip = irq_get_chip_data(irq);
+
+ if (!chip || !chip->teardown_irq)
+ return;
+
+ chip->teardown_irq(chip, irq);
}
int __weak arch_msi_check_device(struct pci_dev *dev, int nvec, int type)
{
}
int __weak arch_msi_check_device(struct pci_dev *dev, int nvec, int type)
{
+ struct msi_chip *chip = dev->bus->msi;
+
+ if (!chip || !chip->check_device)
+ return 0;
+
+ return chip->check_device(chip, dev, nvec, type);
}
int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
}
int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
child->parent = parent;
child->ops = parent->ops;
child->parent = parent;
child->ops = parent->ops;
+ child->msi = parent->msi;
child->sysdata = parent->sysdata;
child->bus_flags = parent->bus_flags;
child->sysdata = parent->sysdata;
child->bus_flags = parent->bus_flags;
void default_teardown_msi_irqs(struct pci_dev *dev);
void default_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);
+};
+
struct resource busn_res; /* bus numbers routed to this bus */
struct pci_ops *ops; /* configuration access functions */
struct resource busn_res; /* bus numbers routed to this bus */
struct pci_ops *ops; /* configuration access functions */
+ struct msi_chip *msi; /* MSI controller */
void *sysdata; /* hook for sys-specific extension */
struct proc_dir_entry *procdir; /* directory entry in /proc/bus/pci */
void *sysdata; /* hook for sys-specific extension */
struct proc_dir_entry *procdir; /* directory entry in /proc/bus/pci */