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 system has booted. The introduction of map/swizzle functions hook in struct pci_host_bridge allows 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()). This series converts all arches still relying on pci_fixup_irqs() to the new pci_scan_root_bus_bridge() API and consequently remove pci_fixup_irqs() from the kernel in that it is not used anymore. Compile tested only, I do not have the necessary hardware. [1] git://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/linux.git pci/pci-fixup-irqs-removal Cc: Ralf Baechle <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Paul Burton <[email protected]> Cc: Rich Felker <[email protected]> Cc: Bjorn Helgaas <[email protected]> Cc: Richard Henderson <[email protected]> Cc: Tanmay Inamdar <[email protected]> Cc: Ivan Kokshaysky <[email protected]> Cc: Chris Metcalf <[email protected]> Cc: "David S. Miller" <[email protected]> Cc: Matthew Minter <[email protected]> Cc: Yoshinori Sato <[email protected]> Cc: Geert Uytterhoeven <[email protected]> Cc: Guan Xuetao <[email protected]> Lorenzo Pieralisi (7): sh/PCI: Replace pci_fixup_irqs() call with PCI host bridge IRQ mapping hooks alpha/PCI: Replace pci_fixup_irqs() call with PCI host bridge IRQ mapping hooks m68k/PCI: Replace pci_fixup_irqs() call with PCI host bridge IRQ mapping hooks MIPS/PCI: Replace pci_fixup_irqs() call with PCI host bridge IRQ mapping hooks tile/PCI: Replace pci_fixup_irqs() call with PCI host bridge IRQ mapping hooks unicore32/PCI: Replace pci_fixup_irqs() call with PCI host bridge IRQ mapping hooks sparc/PCI: Replace pci_fixup_irqs() call with PCI host bridge IRQ mapping hooks Matthew Minter (2): sh/PCI: Remove __init optimisations from IRQ mapping functions/data PCI: Remove pci_fixup_irqs() function arch/alpha/kernel/pci.c | 27 ++++++++++++++++------ arch/alpha/kernel/sys_nautilus.c | 31 +++++++++++++++++++++---- arch/m68k/coldfire/pci.c | 36 +++++++++++++++++++++++++---- arch/mips/pci/pci-legacy.c | 24 +++++++++++++------ arch/sh/drivers/pci/fixups-cayman.c | 2 +- arch/sh/drivers/pci/fixups-dreamcast.c | 2 +- arch/sh/drivers/pci/fixups-r7780rp.c | 2 +- arch/sh/drivers/pci/fixups-rts7751r2d.c | 6 ++--- arch/sh/drivers/pci/fixups-sdk7780.c | 4 ++-- arch/sh/drivers/pci/fixups-se7751.c | 2 +- arch/sh/drivers/pci/fixups-sh03.c | 2 +- arch/sh/drivers/pci/fixups-snapgear.c | 2 +- arch/sh/drivers/pci/fixups-titan.c | 4 ++-- arch/sh/drivers/pci/pci.c | 41 ++++++++++++++++++++------------- arch/sh/drivers/pci/pcie-sh7786.c | 2 +- arch/sparc/kernel/leon_pci.c | 24 ++++++++++++++----- arch/tile/kernel/pci.c | 21 +++++++++++++---- arch/tile/kernel/pci_gx.c | 21 +++++++++++++---- arch/unicore32/kernel/pci.c | 35 ++++++++++++++++++++++++---- drivers/pci/setup-irq.c | 24 ------------------- include/linux/pci.h | 2 -- 21 files changed, 216 insertions(+), 98 deletions(-) -- 2.10.0
