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From: Eric W. Biederman on 3 May 2010 19:30
ebiederm(a)xmission.com (Eric W. Biederman) writes:

> It appears there are a few systems in the wild that use acpi
> interrupt source overrides to report a gsi > 16 is an isa irq.
>
> This breaks all kinds of assumptions I figure any BIOS doing that
> probably should be shot as that is very much not a conservative position.
>
> That said acpi appears to allow this insanity and on the basis of being
> liberal in what we accept we should try to do something reasonable, and
> keep our notions of gsi, isa irq, and linux irq as straight as we can.
>
> To that end this patchset slightly modifies the gsi to linux irq
> mapping. Making it a 1 to 1 identity mapping except for the first 16
> gsis. If those gsis are isa irqs (the typical and default acpi
> configuration) they will be mapped into the first 16 irqs. If those
> first 16 gsis are not isa irqs they will be given a linux irq number
> just past the last gsi. Allowing us the chance to use them.
>
> This patchset is my attempt to straighten out our understanding of which
> kind of irq name is used where and the cleanups used to get there.
>
> Thanks to Yinghai Lu <yinghai(a)kernel.org> for taking the first stab at
> this and finding that there is a real world problem here. This patchset
> is inspired by his work, but little of it remains the same.
>
> This patchset lies in the weird world between the acpi and x86 and ia64.
> Since most of the changes are x86 related I think it makes most sense
> to go via the x86 tree.
>
> v2: Recognize that gsi_end is last gsi for an ioapic not one past the end.
> Since I use gsi_end widely in my patchset a respin of many of the patches
> made sense.
>
> Eric W. Biederman (15):
> x86 acpi/irq: Introduce apci_isa_irq_to_gsi
> x86 acpi/irq: Teach acpi_get_override_irq to take a gsi not an isa_irq
> x86 acpi/irq: pci device dev->irq is an isa irq not a gsi
> x86 acpi/irq: Fix acpi_sci_ioapic_setup so it has both bus_irq and gsi
> x86 acpi/irq: Generalize mp_config_acpi_legacy_irqs
> x86 ioapic: Only export mp_find_ioapic and mp_find_ioapic_pin in io_apic.h
> x86 ioapic: Fix io_apic_redir_entries to return the number of entries.
> x86 ioapic: Fix the types of gsi values
> x86 ioapic: Teach mp_register_ioapic to compute a global gsi_end
> x86 ioapic: In mpparse use mp_register_ioapic
> x86 ioapic: Move nr_ioapic_registers calculation to mp_register_ioapic.
> x86 ioapic: Optimize pin_2_irq
> x86 ioapic: Simplify probe_nr_irqs_gsi.
> x86 acpi/irq: Handle isa irqs that are not identity mapped to gsi's.
> x86 irq: Kill io_apic_renumber_irq
>
> arch/ia64/kernel/acpi.c | 8 ++
> arch/x86/include/asm/io_apic.h | 12 ++--
> arch/x86/include/asm/mpspec.h | 10 ---
> arch/x86/kernel/acpi/boot.c | 133 ++++++++++++++++++++++++--------------
> arch/x86/kernel/apic/es7000_32.c | 19 ------
> arch/x86/kernel/apic/io_apic.c | 99 +++++++++++++---------------
> arch/x86/kernel/mpparse.c | 25 +-------
> arch/x86/kernel/sfi.c | 4 +-
> drivers/acpi/pci_irq.c | 8 ++-
> include/linux/acpi.h | 5 +-
> 10 files changed, 154 insertions(+), 169 deletions(-)

ping

Where are we at with this patchset?

Eric

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Prev: [tip:x86/cpu] x86, cpu: Make APERF/MPERF a normal table-driven flag
Next: [PATCH 18/39] union-mount: Introduce MNT_UNION and MS_UNION flags