On Wed, Feb 26, 2025 at 12:25:06PM -0800, Atish Patra wrote:
> It is helpful to vary the number of the LCOFI interrupts generated
> by the overflow test. Allow additional argument for overflow test
> to accommodate that. It can be easily cross-validated with
> /proc/interrupts output in the host.
>
> Signed-off-by: Atish Patra <atishp@xxxxxxxxxxxx>
> ---
> tools/testing/selftests/kvm/riscv/sbi_pmu_test.c | 36 ++++++++++++++++++++----
> 1 file changed, 30 insertions(+), 6 deletions(-)
>
> diff --git a/tools/testing/selftests/kvm/riscv/sbi_pmu_test.c b/tools/testing/selftests/kvm/riscv/sbi_pmu_test.c
> index 533b76d0de82..7c273a1adb17 100644
> --- a/tools/testing/selftests/kvm/riscv/sbi_pmu_test.c
> +++ b/tools/testing/selftests/kvm/riscv/sbi_pmu_test.c
> @@ -39,8 +39,10 @@ static bool illegal_handler_invoked;
> #define SBI_PMU_TEST_SNAPSHOT BIT(2)
> #define SBI_PMU_TEST_OVERFLOW BIT(3)
>
> +#define SBI_PMU_OVERFLOW_IRQNUM_DEFAULT 5
> struct test_args {
> int disabled_tests;
> + int overflow_irqnum;
> };
>
> static struct test_args targs;
> @@ -478,7 +480,7 @@ static void test_pmu_events_snaphost(void)
>
> static void test_pmu_events_overflow(void)
> {
> - int num_counters = 0;
> + int num_counters = 0, i = 0;
>
> /* Verify presence of SBI PMU and minimum requrired SBI version */
> verify_sbi_requirement_assert();
> @@ -495,11 +497,15 @@ static void test_pmu_events_overflow(void)
> * Qemu supports overflow for cycle/instruction.
> * This test may fail on any platform that do not support overflow for these two events.
> */
> - test_pmu_event_overflow(SBI_PMU_HW_CPU_CYCLES);
> - GUEST_ASSERT_EQ(vcpu_shared_irq_count, 1);
> + for (i = 0; i < targs.overflow_irqnum; i++)
> + test_pmu_event_overflow(SBI_PMU_HW_CPU_CYCLES);
> + GUEST_ASSERT_EQ(vcpu_shared_irq_count, targs.overflow_irqnum);
> +
> + vcpu_shared_irq_count = 0;
>
> - test_pmu_event_overflow(SBI_PMU_HW_INSTRUCTIONS);
> - GUEST_ASSERT_EQ(vcpu_shared_irq_count, 2);
> + for (i = 0; i < targs.overflow_irqnum; i++)
> + test_pmu_event_overflow(SBI_PMU_HW_INSTRUCTIONS);
> + GUEST_ASSERT_EQ(vcpu_shared_irq_count, targs.overflow_irqnum);
>
> GUEST_DONE();
> }
> @@ -621,8 +627,11 @@ static void test_vm_events_overflow(void *guest_code)
>
> static void test_print_help(char *name)
> {
> - pr_info("Usage: %s [-h] [-t <test name>]\n", name);
> + pr_info("Usage: %s [-h] [-t <test name>] [-n <number of LCOFI interrupt for overflow test>]\n",
> + name);
> pr_info("\t-t: Test to run (default all). Available tests are 'basic', 'events', 'snapshot', 'overflow'\n");
> + pr_info("\t-n: Number of LCOFI interrupt to trigger for each event in overflow test (default: %d)\n",
> + SBI_PMU_OVERFLOW_IRQNUM_DEFAULT);
> pr_info("\t-h: print this help screen\n");
> }
>
> @@ -631,6 +640,8 @@ static bool parse_args(int argc, char *argv[])
> int opt;
> int temp_disabled_tests = SBI_PMU_TEST_BASIC | SBI_PMU_TEST_EVENTS | SBI_PMU_TEST_SNAPSHOT |
> SBI_PMU_TEST_OVERFLOW;
> + int overflow_interrupts = -1;
Initializing to -1 made me think that '-n 0' would be valid and a way to
disable the overflow test, but...
> +
> while ((opt = getopt(argc, argv, "h:t:n:")) != -1) {
> switch (opt) {
> case 't':
> @@ -646,12 +657,24 @@ static bool parse_args(int argc, char *argv[])
> goto done;
> targs.disabled_tests = temp_disabled_tests;
> break;
> + case 'n':
> + overflow_interrupts = atoi_positive("Number of LCOFI", optarg);
...here we use atoi_positive() and...
> + break;
> case 'h':
> default:
> goto done;
> }
> }
>
> + if (overflow_interrupts > 0) {
...here we only change from the default of 5 for nonzero.
Should we allow '-n 0'? Otherwise overflow_interrupts can be initialized
to zero (not that it matters).
> + if (targs.disabled_tests & SBI_PMU_TEST_OVERFLOW) {
> + pr_info("-n option is only available for overflow test\n");
> + goto done;
> + } else {
> + targs.overflow_irqnum = overflow_interrupts;
> + }
> + }
> +
> return true;
> done:
> test_print_help(argv[0]);
> @@ -661,6 +684,7 @@ static bool parse_args(int argc, char *argv[])
> int main(int argc, char *argv[])
> {
> targs.disabled_tests = 0;
> + targs.overflow_irqnum = SBI_PMU_OVERFLOW_IRQNUM_DEFAULT;
>
> if (!parse_args(argc, argv))
> exit(KSFT_SKIP);
>
> --
> 2.43.0
>
Thanks,
drew
