[PATCH v4 i-g-t] tests/xe_gt_freq: Avoid RPe usage in subtests
Riana Tauro
riana.tauro at intel.com
Wed Jul 31 16:33:35 UTC 2024
On 7/31/2024 4:31 AM, Vinay Belgaumkar wrote:
> We are seeing several instances where the RPe, which can be altered by
> pcode dynamically, is causing subtests to fail randomly. Instead of relying
> on it, we can use a mid frequency value for these subtests and avoid these
> failures.
>
> v2: Fix bug in the tolerance function. Remove rpe usage from freq_range*
> as well (Badal). Fix test documentation to reflect change (Riana).
>
> v3: Actual frequency cannot be guaranteed to follow the requested value
>
> v4: Handle cases where RPe can be greater than min/cur freq.
>
> Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2200
> Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2196
> Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2262
> Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2256
> Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2203
> Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2412
>
> Cc: Riana Tauro <riana.tauro at intel.com>
> Cc: Badal Nilawar <badal.nilawar at intel.com>
> Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar at intel.com>
Looks good to me
Reviewed-by: Riana Tauro <riana.tauro at intel.com>
> ---
> tests/intel/xe_gt_freq.c | 57 ++++++++++++++++++++++++++++------------
> 1 file changed, 40 insertions(+), 17 deletions(-)
>
> diff --git a/tests/intel/xe_gt_freq.c b/tests/intel/xe_gt_freq.c
> index 93ebb5ed0..c9d59508b 100644
> --- a/tests/intel/xe_gt_freq.c
> +++ b/tests/intel/xe_gt_freq.c
> @@ -26,6 +26,9 @@
> #include <sys/time.h>
>
> #define MAX_N_EXEC_QUEUES 16
> +#define GT_FREQUENCY_MULTIPLIER 50
> +#define GT_FREQUENCY_SCALER 3
> +#define FREQ_UNIT_MHZ DIV_ROUND_CLOSEST(GT_FREQUENCY_MULTIPLIER, GT_FREQUENCY_SCALER)
>
> /*
> * Too many intermediate components and steps before freq is adjusted
> @@ -70,9 +73,14 @@ static uint32_t get_freq(int fd, int gt_id, const char *freq_name)
> return freq;
> }
>
> -static uint32_t rpe(int fd, int gt_id)
> +static bool within_expected_range(uint32_t freq, uint32_t val)
> {
> - return get_freq(fd, gt_id, "rpe");
> + /*
> + * GT Frequencies are requested at units of 16.66 Mhz, so allow
> + * that tolerance.
> + */
> + return (freq <= val + FREQ_UNIT_MHZ) &&
> + (freq >= val - FREQ_UNIT_MHZ);
> }
>
> static uint32_t get_throttle(int fd, int gt_id, const char *throttle_file)
> @@ -128,6 +136,8 @@ static void test_freq_basic_api(int fd, int gt_id)
> {
> uint32_t rpn = get_freq(fd, gt_id, "rpn");
> uint32_t rp0 = get_freq(fd, gt_id, "rp0");
> + uint32_t rpmid = (rp0 + rpn) / 2;
> + uint32_t min_freq, max_freq;
>
> /*
> * Negative bound tests
> @@ -142,16 +152,19 @@ static void test_freq_basic_api(int fd, int gt_id)
> /* Assert min requests are respected from rp0 to rpn */
> igt_assert(set_freq(fd, gt_id, "min", rp0) > 0);
> igt_assert(get_freq(fd, gt_id, "min") == rp0);
> - igt_assert(set_freq(fd, gt_id, "min", rpe(fd, gt_id)) > 0);
> - igt_assert(get_freq(fd, gt_id, "min") == rpe(fd, gt_id));
> + igt_assert(set_freq(fd, gt_id, "min", rpmid) > 0);
> + min_freq = get_freq(fd, gt_id, "min");
> + /* SLPC can set min higher than rpmid - as it follows RPe */
> + igt_assert(min_freq >= (rpmid - FREQ_UNIT_MHZ));
> igt_assert(set_freq(fd, gt_id, "min", rpn) > 0);
> igt_assert(get_freq(fd, gt_id, "min") == rpn);
>
> /* Assert max requests are respected from rpn to rp0 */
> igt_assert(set_freq(fd, gt_id, "max", rpn) > 0);
> igt_assert(get_freq(fd, gt_id, "max") == rpn);
> - igt_assert(set_freq(fd, gt_id, "max", rpe(fd, gt_id)) > 0);
> - igt_assert(get_freq(fd, gt_id, "max") == rpe(fd, gt_id));
> + igt_assert(set_freq(fd, gt_id, "max", rpmid) > 0);
> + max_freq = get_freq(fd, gt_id, "max");
> + igt_assert(within_expected_range(max_freq, rpmid));
> igt_assert(set_freq(fd, gt_id, "max", rp0) > 0);
> igt_assert(get_freq(fd, gt_id, "max") == rp0);
> }
> @@ -168,13 +181,16 @@ static void test_freq_fixed(int fd, int gt_id, bool gt_idle)
> {
> uint32_t rpn = get_freq(fd, gt_id, "rpn");
> uint32_t rp0 = get_freq(fd, gt_id, "rp0");
> + uint32_t rpmid = (rp0 + rpn) / 2;
> + uint32_t cur_freq, act_freq;
>
> igt_debug("Starting testing fixed request\n");
>
> /*
> * For Fixed freq we need to set both min and max to the desired value
> * Then we check if hardware is actually operating at the desired freq
> - * And let's do this for all the 3 known Render Performance (RP) values.
> + * And let's do this for all the 2 known Render Performance (RP) values
> + * RP0 and RPn and something in between.
> */
> igt_assert(set_freq(fd, gt_id, "min", rpn) > 0);
> igt_assert(set_freq(fd, gt_id, "max", rpn) > 0);
> @@ -190,17 +206,20 @@ static void test_freq_fixed(int fd, int gt_id, bool gt_idle)
> igt_assert(get_freq(fd, gt_id, "act") == rpn);
> }
>
> - igt_assert(set_freq(fd, gt_id, "min", rpe(fd, gt_id)) > 0);
> - igt_assert(set_freq(fd, gt_id, "max", rpe(fd, gt_id)) > 0);
> + igt_assert(set_freq(fd, gt_id, "min", rpmid) > 0);
> + igt_assert(set_freq(fd, gt_id, "max", rpmid) > 0);
> usleep(ACT_FREQ_LATENCY_US);
> - igt_assert(get_freq(fd, gt_id, "cur") == rpe(fd, gt_id));
> + cur_freq = get_freq(fd, gt_id, "cur");
> + /* If rpmid is around RPe, we could see SLPC follow it */
> + igt_assert(cur_freq >= (rpmid - FREQ_UNIT_MHZ));
>
> if (gt_idle) {
> igt_assert_f(igt_wait(xe_is_gt_in_c6(fd, gt_id), 1000, 10),
> "GT %d should be in C6\n", gt_id);
> igt_assert(get_freq(fd, gt_id, "act") == 0);
> } else {
> - igt_assert(get_freq(fd, gt_id, "act") == rpe(fd, gt_id));
> + act_freq = get_freq(fd, gt_id, "act");
> + igt_assert(act_freq <= cur_freq + FREQ_UNIT_MHZ);
> }
>
> igt_assert(set_freq(fd, gt_id, "min", rp0) > 0);
> @@ -232,15 +251,17 @@ static void test_freq_fixed(int fd, int gt_id, bool gt_idle)
> static void test_freq_range(int fd, int gt_id, bool gt_idle)
> {
> uint32_t rpn = get_freq(fd, gt_id, "rpn");
> + uint32_t rp0 = get_freq(fd, gt_id, "rp0");
> + uint32_t rpmid = (rp0 + rpn) / 2;
> uint32_t cur, act;
>
> igt_debug("Starting testing range request\n");
>
> igt_assert(set_freq(fd, gt_id, "min", rpn) > 0);
> - igt_assert(set_freq(fd, gt_id, "max", rpe(fd, gt_id)) > 0);
> + igt_assert(set_freq(fd, gt_id, "max", rpmid) > 0);
> usleep(ACT_FREQ_LATENCY_US);
> cur = get_freq(fd, gt_id, "cur");
> - igt_assert(rpn <= cur && cur <= rpe(fd, gt_id));
> + igt_assert(rpn <= cur && cur <= rpmid + FREQ_UNIT_MHZ);
>
> if (gt_idle) {
> igt_assert_f(igt_wait(xe_is_gt_in_c6(fd, gt_id), 1000, 10),
> @@ -248,7 +269,7 @@ static void test_freq_range(int fd, int gt_id, bool gt_idle)
> igt_assert(get_freq(fd, gt_id, "act") == 0);
> } else {
> act = get_freq(fd, gt_id, "act");
> - igt_assert(rpn <= act && act <= rpe(fd, gt_id));
> + igt_assert((rpn <= act) && (act <= cur + FREQ_UNIT_MHZ));
> }
>
> igt_debug("Finished testing range request\n");
> @@ -262,17 +283,19 @@ static void test_freq_range(int fd, int gt_id, bool gt_idle)
> static void test_freq_low_max(int fd, int gt_id)
> {
> uint32_t rpn = get_freq(fd, gt_id, "rpn");
> + uint32_t rp0 = get_freq(fd, gt_id, "rp0");
> + uint32_t rpmid = (rp0 + rpn) / 2;
>
> /*
> * When max request < min request, max is ignored and min works like
> * a fixed one. Let's assert this assumption
> */
> - igt_assert(set_freq(fd, gt_id, "min", rpe(fd, gt_id)) > 0);
> + igt_assert(set_freq(fd, gt_id, "min", rpmid) > 0);
> igt_assert(set_freq(fd, gt_id, "max", rpn) > 0);
> usleep(ACT_FREQ_LATENCY_US);
>
> - /* Refresh value of rpe, pcode could have adjusted it */
> - igt_assert(get_freq(fd, gt_id, "cur") == rpe(fd, gt_id));
> + /* Cur freq will follow RPe, which could be higher than min freq */
> + igt_assert(get_freq(fd, gt_id, "cur") >= (rpmid - FREQ_UNIT_MHZ));
> }
>
> /**
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