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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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1
include/linux/pci.h
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@@ -433,6 +433,7 @@ struct pci_bus {
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 */