Ulrich Schwab wrote:
> why not checking for irq origin like this:
> int my_isr_handler (xnintr_t *irq)
> {
> if ( ! test_my_card_for_irq_origin )
> return XN_ISR_NONE | XN_ISR_PROPAGATE;
> ... /* handling */
> return XN_ISR_HANDLED;
> }
>
> this way XN_ISR_PROPAGATE is never returned in the not-shared case.
I think this idea needs an answer; the answer is no: it will not work.
Because the IRQ will remain masked until Linux handles it, which
basically means that the RT irq will wait for non-RT activity, you loose
real-time response.
The only approach that works is, detailing a bit more what Jan
suggested, assuming that driver1 is RT and driver2 is non RT:
int driver2_nrt_irq_pending;
int driver2_rt_isr_handler(xnintr_t *irq)
{
if (!test_driver2_hard_irq_pending())
return XN_ISR_NONE;
clear_driver2_hard_irq();
driver2_nrt_irq_pending = 1;
return XN_ISR_HANDLED | XN_ISR_PROPAGATE;
}
int driver1_rt_isr_handler(xnintr_t *irq)
{
if (!test_driver1_irq_pending())
return XN_ISR_NONE;
/* driver1 handling */
return XN_ISR_HANDLED;
}
int driver2_nrt_isr_handler(int irq, void *dev_id)
{
#if 0
/* The old code checking and clearing hardware irqs. */
if (!test_drive2_hard_irq_pending())
return IRQ_NONE;
clear_drive2_hard_irq();
#else
/* Replaced by this code. */
if (!driver2_nrt_irq_pending)
return IRQ_NONE;
driver2_nrt_irq_pending = 0;
#endif
/* driver2 irq handling. */
return IRQ_HANDLED;
}
--
Gilles.
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