On Sun, May 17, 2020 at 06:09:00PM +0800, Jingyi Wang wrote:
> Triggers PPIs by setting up a 10msec timer and test the latency.
> For this test can be time consuming, we add time limit for loop_test
> to make sure each test should be done in a certain time(5 sec here).
Having a time limit for the micro-bench tests might be a good idea, as
the overall unit test timeout configured by unittests.cfg can't measure
each individual micro-bench test separately, but it seems what we're
really doing here is saying that we can't do 65536 10ms long vtimer-ppi
tests, so let's do 500 instead -- however by using time to dictate the
count.
I think I'd rather see NTIMES be changed to a micro-bench test parameter
that defaults to 65536, but for the vtimer-ppi test it can be set to
something much smaller.
Also, please create a separate patch for the loop_test()/ntimes changes.
If you'd still like to do a per micro-bench test timeout as well, then
please create a separate patch for that too.
Thanks,
drew
>
> Signed-off-by: Jingyi Wang <wangjingyi11@xxxxxxxxxx>
> ---
> arm/micro-bench.c | 81 ++++++++++++++++++++++++++++++++++++++++-------
> 1 file changed, 70 insertions(+), 11 deletions(-)
>
> diff --git a/arm/micro-bench.c b/arm/micro-bench.c
> index 91af1f7..dbe8e54 100644
> --- a/arm/micro-bench.c
> +++ b/arm/micro-bench.c
> @@ -23,6 +23,11 @@
> #include <asm/gic-v3-its.h>
>
> #define NTIMES (1U << 16)
> +#define MAX_NS (5 * 1000 * 1000 * 1000UL)
> +
> +#define IRQ_VTIMER 27
> +#define ARCH_TIMER_CTL_ENABLE (1 << 0)
> +#define ARCH_TIMER_CTL_IMASK (1 << 1)
>
> static u32 cntfrq;
>
> @@ -33,9 +38,16 @@ static bool ipi_hw;
>
> static void gic_irq_handler(struct pt_regs *regs)
> {
> + u32 irqstat = gic_read_iar();
> irq_ready = false;
> irq_received = true;
> - gic_write_eoir(gic_read_iar());
> + gic_write_eoir(irqstat);
> +
> + if (irqstat == IRQ_VTIMER) {
> + write_sysreg((ARCH_TIMER_CTL_IMASK | ARCH_TIMER_CTL_ENABLE),
> + cntv_ctl_el0);
> + isb();
> + }
> irq_ready = true;
> }
>
> @@ -195,6 +207,47 @@ static void lpi_exec(void)
> assert_msg(irq_received, "failed to receive LPI in time, but received %d successfully\n", received);
> }
>
> +static bool timer_prep(void)
> +{
> + static void *gic_isenabler;
> +
> + gic_enable_defaults();
> + install_irq_handler(EL1H_IRQ, gic_irq_handler);
> + local_irq_enable();
> +
> + gic_isenabler = gicv3_sgi_base() + GICR_ISENABLER0;
> + writel(1 << IRQ_VTIMER, gic_isenabler);
> + write_sysreg(ARCH_TIMER_CTL_ENABLE, cntv_ctl_el0);
> + isb();
> +
> + gic_prep_common();
> + return true;
> +}
> +
> +static void timer_exec(void)
> +{
> + u64 before_timer;
> + u64 timer_10ms;
> + unsigned tries = 1 << 28;
> + static int received = 0;
> +
> + irq_received = false;
> +
> + before_timer = read_sysreg(cntvct_el0);
> + timer_10ms = cntfrq / 100;
> + write_sysreg(before_timer + timer_10ms, cntv_cval_el0);
> + write_sysreg(ARCH_TIMER_CTL_ENABLE, cntv_ctl_el0);
> + isb();
> +
> + while (!irq_received && tries--)
> + cpu_relax();
> +
> + if (irq_received)
> + ++received;
> +
> + assert_msg(irq_received, "failed to receive PPI in time, but received %d successfully\n", received);
> +}
> +
> static void hvc_exec(void)
> {
> asm volatile("mov w0, #0x4b000000; hvc #0" ::: "w0");
> @@ -241,6 +294,7 @@ static struct exit_test tests[] = {
> {"ipi", ipi_prep, ipi_exec, true},
> {"ipi_hw", ipi_hw_prep, ipi_exec, true},
> {"lpi", lpi_prep, lpi_exec, true},
> + {"timer_10ms", timer_prep, timer_exec, true},
> };
>
> struct ns_time {
> @@ -261,27 +315,32 @@ static void ticks_to_ns_time(uint64_t ticks, struct ns_time *ns_time)
>
> static void loop_test(struct exit_test *test)
> {
> - uint64_t start, end, total_ticks, ntimes = NTIMES;
> + uint64_t start, end, total_ticks, ntimes = 0;
> struct ns_time total_ns, avg_ns;
>
> + total_ticks = 0;
> if (test->prep) {
> if(!test->prep()) {
> -
> printf("%s test skipped\n", test->name);
> return;
> }
> }
> - isb();
> - start = read_sysreg(cntpct_el0);
> - while (ntimes--)
> +
> + while (ntimes < NTIMES && total_ns.ns < MAX_NS) {
> + isb();
> + start = read_sysreg(cntpct_el0);
> test->exec();
> - isb();
> - end = read_sysreg(cntpct_el0);
> + isb();
> + end = read_sysreg(cntpct_el0);
> +
> + ntimes++;
> + total_ticks += (end - start);
> + ticks_to_ns_time(total_ticks, &total_ns);
> + }
>
> - total_ticks = end - start;
> ticks_to_ns_time(total_ticks, &total_ns);
> - avg_ns.ns = total_ns.ns / NTIMES;
> - avg_ns.ns_frac = total_ns.ns_frac / NTIMES;
> + avg_ns.ns = total_ns.ns / ntimes;
> + avg_ns.ns_frac = total_ns.ns_frac / ntimes;
>
> printf("%-30s%15" PRId64 ".%-15" PRId64 "%15" PRId64 ".%-15" PRId64 "\n",
> test->name, total_ns.ns, total_ns.ns_frac, avg_ns.ns, avg_ns.ns_frac);
> --
> 2.19.1
>
>
