diff options
| author | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2017-06-28 22:14:04 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2017-07-02 23:14:29 +0200 |
| commit | 16508469c0f3198a63923aaec08efa1c63f5fbcc (patch) | |
| tree | 5eb0ccb921f641574570ff018b0cf3f3988c4239 /arch/arm | |
| parent | PCI: Add a call to pci_assign_irq() in pci_device_probe() (diff) | |
| download | linux-16508469c0f3198a63923aaec08efa1c63f5fbcc.tar.xz linux-16508469c0f3198a63923aaec08efa1c63f5fbcc.zip | |
ARM/PCI: Remove pci_fixup_irqs() call for bios32 host controllers
Legacy PCI host controllers (ie host controllers that set-up the PCI bus
through the ARM pci_common_init() API) are currently relying on
pci_fixup_irqs() to assign legacy PCI irqs to devices. This is not ideal
in that pci_fixup_irqs() assigns IRQs for all PCI devices present in a given
system some of which may well be enabled by the time pci_fixup_irqs() is
called (ie a system with multiple host controllers). With the introduction
of struct pci_host_bridge.(*map_irq) pointer it is possible to assign IRQs
for all devices originating from a PCI host bridge at probe time; this is
implemented through pci_assign_irq() that relies on the struct
pci_host_bridge.map_irq pointer to map IRQ for a given device.
The benefits this brings are twofold:
- the IRQ for a device is assigned once at probe time
- the IRQ assignment works also for hotplugged devices
Remove pci_fixup_irqs() call from bios32 code and rely on pci_assign_irq()
to carry out the IRQ mapping at device probe time.
The map_irq() and swizzle_irq() struct pci_host_bridge callbacks are set-up
in the struct pci_host_bridge created in the bios32 pcibios_init_hw()
function and mach-* code paths (for PCI mach implementations that require a
specific struct hw_pci.(*scan) function callback).
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
[bhelgaas: folded in fixes from Lorenzo:
http://lkml.kernel.org/r/20170701140629.GC8977@red-moon]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Andrew Lunn <andrew@lunn.ch>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/kernel/bios32.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c index 4c7621ac389c..56dc1a3a33b4 100644 --- a/arch/arm/kernel/bios32.c +++ b/arch/arm/kernel/bios32.c @@ -484,6 +484,9 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw, break; } + bridge->map_irq = pcibios_map_irq; + bridge->swizzle_irq = pcibios_swizzle; + if (hw->scan) ret = hw->scan(nr, bridge); else { @@ -530,8 +533,6 @@ void pci_common_init_dev(struct device *parent, struct hw_pci *hw) if (hw->postinit) hw->postinit(); - pci_fixup_irqs(pcibios_swizzle, pcibios_map_irq); - list_for_each_entry(sys, &head, node) { struct pci_bus *bus = sys->bus; |