Commit 3a2b5f34 authored by Jingyi Wang's avatar Jingyi Wang Committed by Paolo Bonzini
Browse files

arm64: microbench: Add timer_post() to get actual PPI latency

For we get the time duration of (10msec timer + injection latency)
in timer_exec(), we substract the value of 10msec in timer_post()
to get the actual latency.

Signed-off-by: default avatarJingyi Wang <>
[ Adapt to the modified post() interface. ]
Signed-off-by: Andrew Jones's avatarAndrew Jones <>
Signed-off-by: default avatarPaolo Bonzini <>
parent 6450d9d6
......@@ -258,6 +258,16 @@ static void timer_exec(void)
assert_msg(irq_received, "failed to receive PPI in time, but received %d successfully\n", received);
static void timer_post(uint64_t ntimes, uint64_t *total_ticks)
* We use a 10msec timer to test the latency of PPI,
* so we substract the ticks of 10msec to get the
* actual latency
*total_ticks -= ntimes * (cntfrq / 100);
static void hvc_exec(void)
asm volatile("mov w0, #0x4b000000; hvc #0" ::: "w0");
......@@ -306,7 +316,7 @@ static struct exit_test tests[] = {
{"ipi", ipi_prep, ipi_exec, NULL, 65536, true},
{"ipi_hw", ipi_hw_prep, ipi_exec, NULL, 65536, true},
{"lpi", lpi_prep, lpi_exec, NULL, 65536, true},
{"timer_10ms", timer_prep, timer_exec, NULL, 256, true},
{"timer_10ms", timer_prep, timer_exec, timer_post, 256, true},
struct ns_time {
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