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    SubjectRe: [PATCH v5 06/27] irq_domain/powerpc: eliminate irq_map; use irq_alloc_desc() instead
    Date
    On Mon, 02 Apr 2012 18:29:15 +0200, Andreas Schwab <schwab@linux-m68k.org> wrote:
    > Andreas Schwab <schwab@linux-m68k.org> writes:
    >
    > > Grant Likely <grant.likely@secretlab.ca> writes:
    > >
    > >> This patch drops the powerpc-specific irq_map table and replaces it with
    > >> directly using the irq_alloc_desc()/irq_free_desc() interfaces for allocating
    > >> and freeing irq_desc structures.
    > >
    > > This breaks irqs on PowerMac G5. I see lost irq errors from the sata
    > > driver.
    >
    > When I revert a09b659cd68c10ec6a30cb91ebd2c327fcd5bfe5 ("genirq: Fix
    > long-term regression in genirq irq_set_irq_type() handling") on top of
    > 3.4-rc1 the sata irq errors disappear, but I see a lot of spurious
    > interrupts. Also the X server is broken somehow, though I don't know
    > whether that is related or a different bug.

    That change is:

    @@ -61,8 +61,7 @@ int irq_set_irq_type(unsigned int irq, unsigned int type)
    return -EINVAL;

    type &= IRQ_TYPE_SENSE_MASK;
    - if (type != IRQ_TYPE_NONE)
    - ret = __irq_set_trigger(desc, irq, type);
    + ret = __irq_set_trigger(desc, irq, type);
    irq_put_desc_busunlock(desc, flags);
    return ret;

    So presumably irq_set_irq_type() is getting called with type ==
    IRQ_TYPE_NONE. From Russell's description, presumably that would mean
    the G5 sata driver isn't setting the correct type for the interrupt,
    but I have *no* idea how that intersects with the change removing the
    powerpc irq map.

    Can you dump out /debug/powerpc/virq_mapping from both before and
    after the irq_map patch is applied?

    g.



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