Test resampling of level interrupts after EOI, by leaving the IRQ
line set in the ISR. One tests does reset the IRQ line after a while,
the other uses masking instead in the ISR.
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
x86/ioapic.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 51 insertions(+)
diff --git a/x86/ioapic.c b/x86/ioapic.c
index 1fcf67e..d43d5c1 100644
--- a/x86/ioapic.c
+++ b/x86/ioapic.c
@@ -188,6 +188,31 @@ static void test_ioapic_level_sequential(void)
report("sequential level interrupts", g_isr_99 == 2);
}
+static volatile int g_isr_9a;
+
+static void ioapic_isr_9a(isr_regs_t *regs)
+{
+ ++g_isr_9a;
+ if (g_isr_9a == 2)
+ set_irq_line(0x0e, 0);
+ eoi();
+}
+
+static void test_ioapic_level_retrigger(void)
+{
+ handle_irq(0x9a, ioapic_isr_9a);
+ set_ioapic_redir(0x0e, 0x9a, LEVEL_TRIGGERED);
+
+ asm volatile ("cli");
+ set_irq_line(0x0e, 1);
+ while (g_isr_9a != 2)
+ asm volatile ("sti; hlt; cli");
+
+ asm volatile ("sti");
+
+ report("retriggered level interrupts without masking", g_isr_9a == 2);
+}
+
static volatile int g_isr_81;
static void ioapic_isr_81(isr_regs_t *regs)
@@ -242,6 +267,30 @@ static void test_ioapic_level_mask(void)
report("unmasked level interrupt", g_isr_82 == 1);
}
+static volatile int g_isr_83;
+
+static void ioapic_isr_83(isr_regs_t *regs)
+{
+ ++g_isr_83;
+ set_mask(0x0e, true);
+ eoi();
+}
+
+static void test_ioapic_level_retrigger_mask(void)
+{
+ handle_irq(0x83, ioapic_isr_83);
+ set_ioapic_redir(0x0e, 0x83, LEVEL_TRIGGERED);
+
+ set_irq_line(0x0e, 1);
+ asm volatile ("nop");
+ set_mask(0x0e, false);
+ asm volatile ("nop");
+ report("retriggered level interrupts with mask", g_isr_83 == 2);
+
+ set_irq_line(0x0e, 0);
+ set_mask(0x0e, false);
+}
+
int main(void)
{
@@ -263,9 +312,11 @@ int main(void)
test_ioapic_simultaneous();
test_ioapic_level_coalesce();
test_ioapic_level_sequential();
+ test_ioapic_level_retrigger();
test_ioapic_edge_mask();
test_ioapic_level_mask();
+ test_ioapic_level_retrigger_mask();
return report_summary();
}
--
1.8.3.1
--
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