[PATCH i-g-t v12] tests/kms_frontbuffer_tracking: Including DRRS test coverage

Lohith BS
2018-01-05T11:47:23Z

Dynamic Refresh Rate Switch(DRRS) is used to switch the panel's
refresh rate to the lowest vrefresh supported by panel, when frame is
not flipped for more than a Sec.

In kernel, DRRS uses the front buffer tracking infrastructure.
Hence DRRS test coverage is added along with other frontbuffer tracking
based features such as FBC and PSR tests.

Here, we are testing DRRS with other features in all possible
combinations, in all required test cases, to capture any possible
regression.

v2: Addressed the comments and suggestions from Vlad, Marius.
The signoff details from the earlier work are also included.

v3: Modified vblank rate calculation by using reply-sequence,
provided by drmWaitVBlank, as suggested by Chris Wilson.

v4: As suggested from Chris Wilson and Daniel Vetter
1) Avoided using pthread for calculating vblank refresh rate,
instead used drmWaitVBlank reply sequence.
2) Avoided using kernel-specific info like transitional delays,
instead polling mechanism with timeout is used.
3) Included edp-DRRS as a subtest in kms_frontbuffer_tracking.c,
instead of having a separate test.

v5: This patch adds DRRS as a new feature in the
kms_frontbuffer_tracking IGT.
DRRS switch to lower vrefresh rate is tested at slow-draw subtest.

Note:
1) Currently kernel doesn't have support to enable and disable
the DRRS feature dynamically(as in case of PSR). Hence if the
panel supports DRRS it will be enabled by default.

This is in continuation of last patch
"https://patchwork.freedesktop.org/patch/162726/"

v6: This patch adds runtime enable and disable feature for testing DRRS

v7: This patch adds runtime enable and disable feature for testing DRRS
through debugfs entry "i915_drrs_ctl".

v8: Commit message is updated to reflect current implementation.

v9: Addressed Paulo Zanoni comments.
Check for DRRS_LOW at tests with OFFSCREEN + FBS_INDIVIDUAL.

v10: Corrected DRRS state expectation in suspend related subtests.

v11: Removing the global flag is_psr_drrs_combo [Rodrigo].

v12: Rewriting the DRRS inactive deduction [Rodrigo].

Signed-off-by: Lohith BS <lohith.bs@intel.com>
Signed-off-by: aknautiy <ankit.k.nautiyal@intel.com>
---
tests/kms_frontbuffer_tracking.c | 178 +++++++++++++++++++++++++++++++++++++--
1 file changed, 170 insertions(+), 8 deletions(-)

diff --git a/tests/kms_frontbuffer_tracking.c b/tests/kms_frontbuffer_tracking.c
index 1601cab..4b87273 100644
--- a/tests/kms_frontbuffer_tracking.c
+++ b/tests/kms_frontbuffer_tracking.c
@@ -34,7 +34,7 @@

IGT_TEST_DESCRIPTION("Test the Kernel's frontbuffer tracking mechanism and "
- "its related features: FBC and PSR");
+ "its related features: FBC, PSR and DRRS");

/*
* One of the aspects of this test is that, for every subtest, we try different
@@ -105,8 +105,9 @@ struct test_mode {
FEATURE_NONE = 0,
FEATURE_FBC = 1,
FEATURE_PSR = 2,
- FEATURE_COUNT = 4,
- FEATURE_DEFAULT = 4,
+ FEATURE_DRRS = 4,
+ FEATURE_COUNT = 8,
+ FEATURE_DEFAULT = 8,
} feature;

/* Possible pixel formats. We just use FORMAT_DEFAULT for most tests and
@@ -156,6 +157,7 @@ struct rect {
struct {
int fd;
int debugfs;
+ int drrs_debugfs_fd;
drmModeResPtr res;
drmModeConnectorPtr connectors[MAX_CONNECTORS];
drmModeEncoderPtr encoders[MAX_ENCODERS];
@@ -182,6 +184,13 @@ struct {
.can_test = false,
};

+#define MAX_DRRS_STATUS_BUF_LEN 256
+
+struct {
+ bool can_test;
+} drrs = {
+ .can_test = false,
+};

#define SINK_CRC_SIZE 12
typedef struct {
@@ -825,6 +834,60 @@ static void psr_print_status(void)
igt_info("PSR status:\n%s\n", buf);
}

+void drrs_set(unsigned int val)
+{
+ char buf[2];
+
+ igt_debug("Manually %sabling DRRS. %llu\n", val ? "en" : "dis", val);
+ snprintf(buf, sizeof(buf), "%d", val);
+ igt_assert_eq(write(drm.drrs_debugfs_fd,
+ buf, strlen(buf)), strlen(buf));
+}
+
+static bool is_drrs_high(void)
+{
+ char buf[MAX_DRRS_STATUS_BUF_LEN];
+
+ debugfs_read("i915_drrs_status", buf);
+ return strstr(buf, "DRRS_HIGH_RR");
+}
+
+static bool is_drrs_low(void)
+{
+ char buf[MAX_DRRS_STATUS_BUF_LEN];
+
+ debugfs_read("i915_drrs_status", buf);
+ return strstr(buf, "DRRS_LOW_RR");
+}
+
+static bool is_drrs_supported(void)
+{
+ char buf[MAX_DRRS_STATUS_BUF_LEN];
+
+ debugfs_read("i915_drrs_status", buf);
+ return strstr(buf, "DRRS Supported: Yes");
+}
+
+static bool is_drrs_inactive(void)
+{
+ char buf[MAX_DRRS_STATUS_BUF_LEN];
+
+ debugfs_read("i915_drrs_status", buf);
+
+ if (strstr(buf, "DRRS_State: "))
+ return false;
+
+ return true;
+}
+
+static void drrs_print_status(void)
+{
+ char buf[MAX_DRRS_STATUS_BUF_LEN];
+
+ debugfs_read("i915_drrs_status", buf);
+ igt_info("DRRS STATUS :\n%s\n", buf);
+}
+
static struct timespec fbc_get_last_action(void)
{
struct timespec ret = { 0, 0 };
@@ -935,10 +998,17 @@ static bool psr_wait_until_enabled(void)
return igt_wait(psr_is_enabled(), 5000, 1);
}

+static bool drrs_wait_until_rr_switch_to_low(void)
+{
+ return igt_wait(is_drrs_low(), 5000, 1);
+}
+
#define fbc_enable() igt_set_module_param_int("enable_fbc", 1)
#define fbc_disable() igt_set_module_param_int("enable_fbc", 0)
#define psr_enable() igt_set_module_param_int("enable_psr", 1)
#define psr_disable() igt_set_module_param_int("enable_psr", 0)
+#define drrs_enable() drrs_set(1)
+#define drrs_disable() drrs_set(0)

static void get_sink_crc(sink_crc_t *crc, bool mandatory)
{
@@ -1184,6 +1254,7 @@ static void disable_features(const struct test_mode *t)

fbc_disable();
psr_disable();
+ drrs_disable();
}

static void *busy_thread_func(void *data)
@@ -1508,6 +1579,12 @@ static void teardown_crcs(void)
igt_pipe_crc_free(pipe_crc);
}

+static void teardown_drrs(void)
+{
+ if (drm.drrs_debugfs_fd != -1)
+ close(drm.drrs_debugfs_fd);
+}
+
static bool fbc_supported_on_chipset(void)
{
char buf[128];
@@ -1577,6 +1654,29 @@ static void teardown_psr(void)
{
}

+static void setup_drrs(void)
+{
+ if (get_connector(prim_mode_params.connector_id)->connector_type !=
+ DRM_MODE_CONNECTOR_eDP) {
+ igt_info("Can't test DRRS: no usable eDP screen.\n");
+ return;
+ }
+
+ if (!is_drrs_supported()) {
+ igt_info("Can't test DRRS: Not supported.\n");
+ return;
+ }
+
+ drm.drrs_debugfs_fd = openat(drm.debugfs, "i915_drrs_ctl", O_WRONLY);
+
+ if (drm.drrs_debugfs_fd > 0) {
+ drrs.can_test = true;
+ } else {
+ igt_info("Can't test DRRS: Debugfs entry i915_drrs_ctl not found.\n");
+ drrs.can_test = false;
+ }
+}
+
static void setup_environment(void)
{
setup_drm();
@@ -1584,6 +1684,7 @@ static void setup_environment(void)

setup_fbc();
setup_psr();
+ setup_drrs();

setup_crcs();
}
@@ -1596,6 +1697,7 @@ static void teardown_environment(void)
teardown_psr();
teardown_fbc();
teardown_modeset();
+ teardown_drrs();
teardown_drm();
}

@@ -1662,6 +1764,11 @@ static void do_flush(const struct test_mode *t)
#define ASSERT_PSR_ENABLED (1 << 6)
#define ASSERT_PSR_DISABLED (1 << 7)

+#define DRRS_ASSERT_FLAGS (7 << 8)
+#define ASSERT_DRRS_HIGH (1 << 8)
+#define ASSERT_DRRS_LOW (1 << 9)
+#define ASSERT_DRRS_INACTIVE (1 << 10)
+
static int adjust_assertion_flags(const struct test_mode *t, int flags)
{
if (!(flags & DONT_ASSERT_FEATURE_STATUS)) {
@@ -1669,12 +1776,17 @@ static int adjust_assertion_flags(const struct test_mode *t, int flags)
flags |= ASSERT_FBC_ENABLED;
if (!(flags & ASSERT_PSR_DISABLED))
flags |= ASSERT_PSR_ENABLED;
+ if (!((flags & ASSERT_DRRS_LOW) ||
+ (flags & ASSERT_DRRS_INACTIVE)))
+ flags |= ASSERT_DRRS_HIGH;
}

if ((t->feature & FEATURE_FBC) == 0)
flags &= ~FBC_ASSERT_FLAGS;
if ((t->feature & FEATURE_PSR) == 0)
flags &= ~PSR_ASSERT_FLAGS;
+ if ((t->feature & FEATURE_DRRS) == 0)
+ flags &= ~DRRS_ASSERT_FLAGS;

return flags;
}
@@ -1706,6 +1818,23 @@ static void do_status_assertions(int flags)
return;
}

+ if (flags & ASSERT_DRRS_HIGH) {
+ if (!is_drrs_high()) {
+ drrs_print_status();
+ igt_assert_f(false, "DRRS HIGH\n");
+ }
+ } else if (flags & ASSERT_DRRS_LOW) {
+ if (!drrs_wait_until_rr_switch_to_low()) {
+ drrs_print_status();
+ igt_assert_f(false, "DRRS LOW\n");
+ }
+ } else if (flags & ASSERT_DRRS_INACTIVE) {
+ if (!is_drrs_inactive()) {
+ drrs_print_status();
+ igt_assert_f(false, "DRRS INACTIVE\n");
+ }
+ }
+
if (flags & ASSERT_FBC_ENABLED) {
igt_require(!fbc_not_enough_stolen());
igt_require(!fbc_stride_not_supported());
@@ -1833,6 +1962,8 @@ static void enable_features_for_test(const struct test_mode *t)
fbc_enable();
if (t->feature & FEATURE_PSR)
psr_enable();
+ if (t->feature & FEATURE_DRRS)
+ drrs_enable();
}

static void check_test_requirements(const struct test_mode *t)
@@ -1852,6 +1983,18 @@ static void check_test_requirements(const struct test_mode *t)
"Can't test PSR without sink CRCs\n");
}

+ if (t->feature & FEATURE_DRRS)
+ igt_require_f(drrs.can_test,
+ "Can't test DRRS with the current outputs\n");
+
+ /*
+ * In kernel, When PSR is enabled, DRRS will be disabled. So If a test
+ * case needs DRRS + PSR enabled, that will be skipped.
+ */
+ igt_require_f(!((t->feature & FEATURE_PSR) &&
+ (t->feature & FEATURE_DRRS)),
+ "Can't test PSR and DRRS together\n");
+
if (opt.only_pipes != PIPE_COUNT)
igt_require(t->pipes == opt.only_pipes);
}
@@ -1973,7 +2116,7 @@ static void rte_subtest(const struct test_mode *t)

unset_all_crtcs();
do_assertions(ASSERT_FBC_DISABLED | ASSERT_PSR_DISABLED |
- DONT_ASSERT_CRC);
+ DONT_ASSERT_CRC | ASSERT_DRRS_INACTIVE);

enable_prim_screen_and_wait(t);
set_cursor_for_test(t, &prim_mode_params);
@@ -2065,6 +2208,13 @@ static void draw_subtest(const struct test_mode *t)
if (op_disables_psr(t, t->method))
assertions |= ASSERT_PSR_DISABLED;

+ /*
+ * On FBS_INDIVIDUAL, write to offscreen plane will not touch the
+ * current frambuffer. Hence assert for DRRS_LOW.
+ */
+ if ((t->fbs == FBS_INDIVIDUAL) && (t->screen == SCREEN_OFFSCREEN))
+ assertions |= ASSERT_DRRS_LOW;
+
prepare_subtest(t, pattern);
target = pick_target(t, params);

@@ -2273,7 +2423,11 @@ static void slow_draw_subtest(const struct test_mode *t)
sleep(2);

update_wanted_crc(t, &pattern->crcs[t->format][r]);
- do_assertions(0);
+
+ if (t->feature & FEATURE_DRRS)
+ do_assertions(ASSERT_DRRS_LOW);
+ else
+ do_assertions(0);
}
}

@@ -2882,14 +3036,14 @@ static void suspend_subtest(const struct test_mode *t)
sleep(5);
igt_system_suspend_autoresume(SUSPEND_STATE_MEM, SUSPEND_TEST_NONE);
sleep(5);
- do_assertions(0);
+ do_assertions(ASSERT_DRRS_LOW);

unset_all_crtcs();
sleep(5);
igt_system_suspend_autoresume(SUSPEND_STATE_MEM, SUSPEND_TEST_NONE);
sleep(5);
do_assertions(ASSERT_FBC_DISABLED | ASSERT_PSR_DISABLED |
- DONT_ASSERT_CRC);
+ DONT_ASSERT_CRC | ASSERT_DRRS_INACTIVE);

set_mode_for_params(params);
do_assertions(0);
@@ -3371,6 +3525,14 @@ static const char *feature_str(int feature)
return "psr";
case FEATURE_FBC | FEATURE_PSR:
return "fbcpsr";
+ case FEATURE_DRRS:
+ return "drrs";
+ case FEATURE_FBC | FEATURE_DRRS:
+ return "fbcdrrs";
+ case FEATURE_PSR | FEATURE_DRRS:
+ return "psrdrrs";
+ case FEATURE_FBC | FEATURE_PSR | FEATURE_DRRS:
+ return "fbcpsrdrrs";
default:
igt_assert(false);
}
@@ -3635,7 +3797,7 @@ int main(int argc, char *argv[])
tilingchange_subtest(&t);
}

- if (t.feature & FEATURE_PSR)
+ if ((t.feature & FEATURE_PSR) || (t.feature & FEATURE_DRRS))
igt_subtest_f("%s-slowdraw", feature_str(t.feature))
slow_draw_subtest(&t);

--
1.9.1