• Lorenzo Pieralisi's avatar
    alpha/PCI: Replace pci_fixup_irqs() call with host bridge IRQ mapping hooks · 0e4c2eeb
    Lorenzo Pieralisi authored
    The pci_fixup_irqs() function allocates IRQs for all PCI devices present in
    a system; those PCI devices possibly belong to different PCI bus trees (and
    possibly rooted at different host bridges) and may well be enabled (ie
    probed and bound to a driver) by the time pci_fixup_irqs() is called when
    probing a given host bridge driver.
    
    Furthermore, current kernel code relying on pci_fixup_irqs() to assign
    legacy PCI IRQs to devices does not work at all for hotplugged devices in
    that the code carrying out the IRQ fixup is called at host bridge driver
    probe time, which just cannot take into account devices hotplugged after
    the system has booted.
    
    The introduction of map/swizzle function hooks in struct pci_host_bridge
    allows us to define per-bridge map/swizzle functions that can be used at
    device probe time in PCI core code to allocate IRQs for a given device
    (through pci_assign_irq()).
    
    Convert PCI host bridge initialization code to the
    pci_scan_root_bus_bridge() API (that allows to pass a struct
    pci_host_bridge with initialized map/swizzle pointers) and remove the
    pci_fixup_irqs() call from arch code.
    Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
    Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
    Cc: Richard Henderson <rth@twiddle.net>
    Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
    0e4c2eeb
pci.c 11.2 KB