arm64: Skip irqflags tracing for NMI in IRQs disabled context

Julien Thierry · ctmarinas · commit c25349fd3c80 · 2019-02-06T10:06:41.000Z
When an NMI is raised while interrupts where disabled, the IRQ tracing
already is in the correct state (i.e. hardirqs_off) and should be left
as such when returning to the interrupted context.

Check whether PMR was masking interrupts when the NMI was raised and
skip IRQ tracing if necessary.

Signed-off-by: Julien Thierry &lt;julien.thierry@arm.com&gt;
Acked-by: Marc Zyngier &lt;marc.zyngier@arm.com&gt;
Cc: Will Deacon &lt;will.deacon@arm.com&gt;
Cc: Marc Zyngier &lt;marc.zyngier@arm.com&gt;
Signed-off-by: Catalin Marinas &lt;catalin.marinas@arm.com&gt;
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
@@ -617,7 +617,18 @@ el1_irq:
 	kernel_entry 1
 	enable_da_f
 #ifdef CONFIG_TRACE_IRQFLAGS
+#ifdef CONFIG_ARM64_PSEUDO_NMI
+alternative_if ARM64_HAS_IRQ_PRIO_MASKING
+	ldr	x20, [sp, #S_PMR_SAVE]
+alternative_else
+	mov	x20, #GIC_PRIO_IRQON
+alternative_endif
+	cmp	x20, #GIC_PRIO_IRQOFF
+	/* Irqs were disabled, don't trace */
+	b.ls	1f
+#endif
 	bl	trace_hardirqs_off
+1:
 #endif
 
 	irq_handler
@@ -637,8 +648,18 @@ alternative_else_nop_endif
 1:
 #endif
 #ifdef CONFIG_TRACE_IRQFLAGS
+#ifdef CONFIG_ARM64_PSEUDO_NMI
+	/*
+	 * if IRQs were disabled when we received the interrupt, we have an NMI
+	 * and we are not re-enabling interrupt upon eret. Skip tracing.
+	 */
+	cmp	x20, #GIC_PRIO_IRQOFF
+	b.ls	1f
+#endif
 	bl	trace_hardirqs_on
+1:
 #endif
+
 	kernel_exit 1
 ENDPROC(el1_irq)
 
