[PATCH i-g-t v2] test/xe_gt_freq: Add helper to read RPe freq

[Vinay Belgaumkar]

We are seeing a possible switch in RPe right after RC6 wakeup.
Ensure we obtain the latest RPe by reading it every time. If pcode
does change the RPe after RC6 exit, the cur frequency should get
updated to match it.

v2: Rebase and add another comment to commit message (Badal)

Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/1414
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/1829
Fixes: adcc68266b8e ("tests/intel/xe_gt_freq: Check for RPe freq updates")
Reviewed-by: Badal Nilawar <badal.nilawar at intel.com>
Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar at intel.com>
---
 tests/intel/xe_gt_freq.c | 40 ++++++++++++++++++----------------------
 1 file changed, 18 insertions(+), 22 deletions(-)

diff --git a/tests/intel/xe_gt_freq.c b/tests/intel/xe_gt_freq.c
index b3562181d..93ebb5ed0 100644
--- a/tests/intel/xe_gt_freq.c
+++ b/tests/intel/xe_gt_freq.c
@@ -70,6 +70,11 @@ 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)
+{
+	return get_freq(fd, gt_id, "rpe");
+}
+
 static uint32_t get_throttle(int fd, int gt_id, const char *throttle_file)
 {
 	uint32_t val;
@@ -122,7 +127,6 @@ static void test_throttle_basic_api(int fd, int gt_id)
 static void test_freq_basic_api(int fd, int gt_id)
 {
 	uint32_t rpn = get_freq(fd, gt_id, "rpn");
-	uint32_t rpe = get_freq(fd, gt_id, "rpe");
 	uint32_t rp0 = get_freq(fd, gt_id, "rp0");
 
 	/*
@@ -138,16 +142,16 @@ 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) > 0);
-	igt_assert(get_freq(fd, gt_id, "min") == rpe);
+	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", 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) > 0);
-	igt_assert(get_freq(fd, gt_id, "max") == rpe);
+	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", rp0) > 0);
 	igt_assert(get_freq(fd, gt_id, "max") == rp0);
 }
@@ -163,7 +167,6 @@ static void test_freq_basic_api(int fd, int gt_id)
 static void test_freq_fixed(int fd, int gt_id, bool gt_idle)
 {
 	uint32_t rpn = get_freq(fd, gt_id, "rpn");
-	uint32_t rpe = get_freq(fd, gt_id, "rpe");
 	uint32_t rp0 = get_freq(fd, gt_id, "rp0");
 
 	igt_debug("Starting testing fixed request\n");
@@ -187,20 +190,17 @@ static void test_freq_fixed(int fd, int gt_id, bool gt_idle)
 		igt_assert(get_freq(fd, gt_id, "act") == rpn);
 	}
 
-	/* Refresh value of rpe, pcode could have adjusted it */
-	rpe = get_freq(fd, gt_id, "rpe");
-
-	igt_assert(set_freq(fd, gt_id, "min", rpe) > 0);
-	igt_assert(set_freq(fd, gt_id, "max", rpe) > 0);
+	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);
 	usleep(ACT_FREQ_LATENCY_US);
-	igt_assert(get_freq(fd, gt_id, "cur") == rpe);
+	igt_assert(get_freq(fd, gt_id, "cur") == rpe(fd, gt_id));
 
 	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);
+		igt_assert(get_freq(fd, gt_id, "act") == rpe(fd, gt_id));
 	}
 
 	igt_assert(set_freq(fd, gt_id, "min", rp0) > 0);
@@ -232,16 +232,15 @@ 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 rpe = get_freq(fd, gt_id, "rpe");
 	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) > 0);
+	igt_assert(set_freq(fd, gt_id, "max", rpe(fd, gt_id)) > 0);
 	usleep(ACT_FREQ_LATENCY_US);
 	cur = get_freq(fd, gt_id, "cur");
-	igt_assert(rpn <= cur && cur <= rpe);
+	igt_assert(rpn <= cur && cur <= rpe(fd, gt_id));
 
 	if (gt_idle) {
 		igt_assert_f(igt_wait(xe_is_gt_in_c6(fd, gt_id), 1000, 10),
@@ -249,7 +248,7 @@ 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);
+		igt_assert(rpn <= act && act <= rpe(fd, gt_id));
 	}
 
 	igt_debug("Finished testing range request\n");
@@ -263,20 +262,17 @@ 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 rpe = get_freq(fd, gt_id, "rpe");
 
 	/*
 	 *  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) > 0);
+	igt_assert(set_freq(fd, gt_id, "min", rpe(fd, gt_id)) > 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 */
-	rpe = get_freq(fd, gt_id, "rpe");
-
-	igt_assert(get_freq(fd, gt_id, "cur") == rpe);
+	igt_assert(get_freq(fd, gt_id, "cur") == rpe(fd, gt_id));
 }
 
 /**
-- 
2.38.1