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powerpc/64: Replay hypervisor maintenance interrupt first 

The HMI (Hypervisor Maintenance Interrupt) is defined by the
architecture to be higher priority than other maskable interrupts, so
replay it first, as a best-effort to replay according to hardware
priorities.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
hifive-unleashed-5.1
Nicholas Piggin 2016-09-14 13:01:21 +10:00 committed by Michael Ellerman
parent 7de3b27bac
commit e0e0d6b739
1 changed files with 9 additions and 5 deletions
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14
arch/powerpc/kernel/irq.c
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@ -156,6 +156,15 @@ notrace unsigned int __check_irq_replay(void)
lv1_get_version_info(&tmp, &tmp2);
}
/*
* Check if an hypervisor Maintenance interrupt happened.
* This is a higher priority interrupt than the others, so
* replay it first.
*/
local_paca->irq_happened &= ~PACA_IRQ_HMI;
if (happened & PACA_IRQ_HMI)
return 0xe60;
/*
* We may have missed a decrementer interrupt. We check the
* decrementer itself rather than the paca irq_happened field
@ -191,11 +200,6 @@ notrace unsigned int __check_irq_replay(void)
}
#endif /* CONFIG_PPC_BOOK3E */
/* Check if an hypervisor Maintenance interrupt happened */
local_paca->irq_happened &= ~PACA_IRQ_HMI;
if (happened & PACA_IRQ_HMI)
return 0xe60;
/* There should be nothing left ! */
BUG_ON(local_paca->irq_happened != 0);