[PATCH v4 i-g-t] tests/xe_gt_freq: Avoid RPe usage in subtests
Vinay Belgaumkar
vinay.belgaumkar at intel.com
Tue Jul 30 23:01:23 UTC 2024
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>
---
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));
}
/**
--
2.38.1
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