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    SubjectRe: i915_driver_irq_handler: irq 42: nobody cared
    On 04/09/2012 07:11 PM, Jesse Barnes wrote:
    > On Fri, 30 Mar 2012 11:45:43 +0100 Chris Wilson
    > <chris@chris-wilson.co.uk> wrote:
    >
    >> On Fri, 30 Mar 2012 11:59:28 +0200, Jiri Slaby <jslaby@suse.cz>
    >> wrote:
    >>> I don't know what to dump more, because iir is obviously zero
    >>> too. What other sources of interrupts are on the (G33) chip?
    >>
    >> IIR is the master interrupt, with chained secondary interrupt
    >> statuses. If IIR is 0, the interrupt wasn't raised by the GPU.
    >
    > I've actually seen cases where one of the PIPE*STAT regs is stuck,
    > and even if IIR is 0 we still get interrupts... Jiri can you verify
    > the PIPE*STAT regs have bits set, maybe one or more we don't check
    > for?

    Note that I already attached their contents... This is what is in them
    (pipes 0 and 1):
    [ 3572.968581] i915_driver_irq_handler: 0=00000000 1=00000000
    [ 3572.977472] i915_driver_irq_handler: 0=00000000 1=00000000
    [ 3576.224839] i915_driver_irq_handler: 0=00000000 1=00000000
    [ 3576.243558] i915_driver_irq_handler: 0=00000000 1=00000000
    [ 3576.384912] i915_driver_irq_handler: 0=00000000 1=00000000
    [ 3576.403462] i915_driver_irq_handler: 0=00000000 1=00000000
    [ 3577.464100] i915_driver_irq_handler: 0=00000000 1=00000000
    [ 3577.477383] i915_driver_irq_handler: 0=00000000 1=00000000
    [ 3577.829016] i915_driver_irq_handler: 0=00020000 1=00000000
    [ 3577.830093] i915_driver_irq_handler: 0=00020000 1=00000000

    I.e. the handler is called when IIR=0 and both pipe stats are 0.

    The stats are dumped this way:
    @@ -1416,6 +1417,14 @@ static irqreturn_t
    i915_driver_irq_handler(DRM_IRQ_ARGS)
    iir = new_iir;
    }

    + if (ret == IRQ_NONE && printk_ratelimit()) {
    + printk(KERN_DEBUG "%s:", __func__);
    + for_each_pipe(pipe) {
    + printk(KERN_CONT " %d=%.8x", pipe,
    + pipe_stats[pipe]);
    + }
    + }
    +
    return ret;
    }

    thanks,
    --
    js
    suse labs


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