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powerpc/64: replay hypervisor maintenance priority

PATCH Applied Nicholas Piggin 2 participants 2 messages Sep 14, 2016 – Sep 20, 2016 PowerPC

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Nicholas Piggin

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PATCH 1/1 powerpc/64: replay hypervisor maintenance priority

The hmi is defined 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 <[email protected]>
---
 arch/powerpc/kernel/irq.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)
arch/powerpc/kernel/irq.c +9 -5
index 3cb46a3..ad1a930 100644
@@ -155,6 +155,15 @@ notrace unsigned int __check_irq_replay(void)
 	}
 
 	/*
+	 * 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
 	 * in case we also had a rollover while hard disabled

@@ -189,11 +198,6 @@ 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);
Signature · 1 line
2.9.3