[igt-dev] [PATCH i-g-t 2/3] tests/xe: Add a test to toggle GT C states and validate power

[Sundaresan, Sujaritha]

On 8/17/2023 11:23 AM, Riana Tauro wrote:
> Add a test that toggles GT C states by checking if GT is in C0 when
> forcewake is acquired and in C6 once released.
> This test also validates power consumed by GPU in GT C6 is lesser
> than GT C0.
>
> v2: change test name (Suja, Anshuman)
> v3: add exit handler for closing forcewake handle
>      define a macro for number of repetitions (Vinay)
>      change forcewake open to readonly (Anshuman)
>      modify test to validate power
>
> Signed-off-by: Riana Tauro <riana.tauro at intel.com>
> ---
>   tests/xe/xe_pm_residency.c | 67 ++++++++++++++++++++++++++++++++++++++
>   1 file changed, 67 insertions(+)
>
> diff --git a/tests/xe/xe_pm_residency.c b/tests/xe/xe_pm_residency.c
> index fd4876eaf..3a6611fac 100644
> --- a/tests/xe/xe_pm_residency.c
> +++ b/tests/xe/xe_pm_residency.c
> @@ -14,14 +14,17 @@
>   
>   #include "igt.h"
>   #include "igt_device.h"
> +#include "igt_power.h"
>   #include "igt_sysfs.h"
>   
>   #include "xe/xe_query.h"
>   #include "xe/xe_util.h"
>   
> +#define NUM_REPS 16 /* No of Repetitions */
>   #define SLEEP_DURATION 3000 /* in milliseconds */
>   
>   const double tolerance = 0.1;
> +int forcewake_handle = -1;
>   
>   #define assert_within_epsilon(x, ref, tol) \
>   	igt_assert_f((double)(x) <= (1.0 + (tol)) * (double)(ref) && \
> @@ -50,9 +53,19 @@ enum test_type {
>    * Description: Validate idle residency measured over suspend(s2idle)
>    *              is greater than suspend time or within tolerance
>    * Run type: FULL
> + *
> + * SUBTEST: toggle-gt-c6
> + * Description: toggles GT C states by acquiring/releasing forcewake,
> + *		also validates power consumed by GPU in GT C6 is lesser than that of GT C0.
> + * Run type: FULL
>    */
>   IGT_TEST_DESCRIPTION("Tests for gtidle properties");
>   
> +static void restore(int sig)
> +{
> +	close(forcewake_handle);
> +}
> +
>   static unsigned int measured_usleep(unsigned int usec)
>   {
>   	struct timespec ts = { };
> @@ -117,6 +130,54 @@ static void test_idle_residency(int fd, int gt, enum test_type flag)
>   	assert_within_epsilon(residency_end - residency_start, elapsed_ms, tolerance);
>   }
>   
> +static void measure_power(struct igt_power *gpu, double *power)
> +{
> +	struct power_sample power_sample[2];
> +
> +	igt_power_get_energy(gpu, &power_sample[0]);
> +	measured_usleep(SLEEP_DURATION * 1000);
> +	igt_power_get_energy(gpu, &power_sample[1]);
> +	*power = igt_power_get_mW(gpu, &power_sample[0], &power_sample[1]);
> +}
> +
> +static void toggle_gt_c6(int fd, int n)
> +{
> +	double gt_c0_power, gt_c6_power;
> +	int gt;
> +	struct igt_power gpu;
> +
> +	igt_power_open(fd, &gpu, "gpu");
> +
> +	do {
> +		forcewake_handle = igt_debugfs_open(fd, "forcewake_all", O_RDONLY);
> +		igt_assert(forcewake_handle >= 0);
> +		/* check if all gts are in C0 after forcewake is acquired */
> +		xe_for_each_gt(fd, gt)
> +			igt_assert_f(!xe_is_gt_in_c6(fd, gt),
> +				     "Forcewake acquired, GT should be in C0\n");
> +
> +		if (n == NUM_REPS)
> +			measure_power(&gpu, &gt_c0_power);
> +
> +		close(forcewake_handle);
> +		/* check if all gts are in C6 after forcewake is released */
> +		xe_for_each_gt(fd, gt)
> +			igt_assert_f(igt_wait(xe_is_gt_in_c6(fd, gt), 1000, 1),
> +				     "Forcewake released, GT should be in C6\n");
> +
> +		if (n == NUM_REPS)
> +			measure_power(&gpu, &gt_c6_power);
> +	} while (n--);
> +
> +	igt_power_close(&gpu);
> +	igt_info("GPU consumed %fmW in GT C6 and %fmW in GT C0\n", gt_c6_power, gt_c0_power);
> +
> +	/* FIXME: Remove dgfx check after hwmon is added */
> +	if (!xe_has_vram(fd))
> +		igt_assert_f(gt_c6_power < gt_c0_power,
> +			     "Power consumed in GT C6 should be lower than GT C0\n");
> +}
> +
>   igt_main
>   {
>   	uint32_t d3cold_allowed;
> @@ -152,6 +213,12 @@ igt_main
>   		xe_for_each_gt(fd, gt)
>   			test_idle_residency(fd, gt, TEST_IDLE);
>   
> +	igt_describe("Toggle GT C states by acquiring/releasing forcewake and validate power measured");
> +	igt_subtest("toggle-gt-c6") {
> +		igt_install_exit_handler(restore);
> +		toggle_gt_c6(fd, NUM_REPS);
> +	}
> +
>   	igt_fixture {
>   		close(fd);
>   	}

lgtm,

Reviewed-by: Sujaritha Sundaresan <sujaritha.sundaresan at intel.com>