[i-g-t, v2, 1/2] tests/xe: Add tests to validate GT coarse power gating status and toggle coarse power gating states

[sk.anirban at intel.com]

From: Sk Anirban <sk.anirban at intel.com>

Implement test test-cpg-basic to validate coarse power gating status
using a suspend cycle.
Add test toggle-gt-cpg to check if GT coarse power gating is up when
forcewake is acquired and down when released.

v2: Address cosmetic review comments (Riana)
    Fix suspend state (Riana)
    Add exit handler for this test toggle_gt_cpg (Riana)

Signed-off-by: Sk Anirban <sk.anirban at intel.com>
---
 tests/intel/xe_pm_residency.c | 98 +++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)

diff --git a/tests/intel/xe_pm_residency.c b/tests/intel/xe_pm_residency.c
index 772fe9b57..54a8c62f7 100644
--- a/tests/intel/xe_pm_residency.c
+++ b/tests/intel/xe_pm_residency.c
@@ -63,6 +63,12 @@ enum test_type {
  * 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.
+ *
+ * SUBTEST: cpg-basic
+ * Description: Validate GT coarse power gating status with a suspend cycle.
+ *
+ * SUBTEST: toggle-gt-cpg
+ * Description: Toggle GT coarse power gating states by acquiring/releasing forcewake.
  */
 IGT_TEST_DESCRIPTION("Tests for gtidle properties");
 
@@ -317,6 +323,87 @@ static void toggle_gt_c6(int fd, int n)
 			     "Power consumed in GT C6 should be lower than GT C0\n");
 }
 
+#define RENDER_POWER_GATING "Render Power Gating Enabled: "
+#define MEDIA_POWER_GATING "Media Power Gating Enabled: "
+#define POWER_GATE_STATUS "Power Gate Status: "
+
+static void powergate_info(int fd, int gt)
+{
+	int dir;
+	char *str;
+	char *render_substr;
+	char *media_substr;
+
+	dir = igt_debugfs_gt_dir(fd, gt);
+	igt_assert(dir >= 0);
+
+	str = igt_sysfs_get(dir, "powergate_info");
+	igt_assert_f(str, "Failed to read sysfs attribute\n");
+	render_substr = strstr(str, RENDER_POWER_GATING);
+	if (render_substr) {
+		igt_assert_f(strncmp(render_substr + strlen(RENDER_POWER_GATING), "yes", 3) == 0,
+			     "Render Power Gating should be enabled");
+	}
+
+	media_substr = strstr(str, MEDIA_POWER_GATING);
+	if (media_substr) {
+		igt_assert_f(strncmp(media_substr + strlen(MEDIA_POWER_GATING), "yes", 3) == 0,
+			     "Media Power Gating should be enabled");
+	}
+
+	free(str);
+	close(dir);
+}
+
+
+static void powergate_status(int fd, int gt, const char *expected_status)
+{
+	int dir;
+	char *str;
+	char *status_substr;
+
+	dir = igt_debugfs_gt_dir(fd, gt);
+	igt_assert(dir >= 0);
+
+	str = igt_sysfs_get(dir, "powergate_info");
+	igt_assert_f(str, "Failed to read sysfs attribute\n");
+	status_substr = strstr(str, POWER_GATE_STATUS);
+	while (status_substr) {
+		igt_assert_f((strncmp(status_substr + strlen(POWER_GATE_STATUS), expected_status,
+		strlen(expected_status)) == 0), "Power Gate Status Should be %s\n %s\n",
+		expected_status, str);
+
+		status_substr = strstr(status_substr + strlen(POWER_GATE_STATUS),
+		POWER_GATE_STATUS);
+	}
+	close(dir);
+}
+
+static void cpg_basic(int fd, int gt)
+{
+	powergate_info(fd, gt);
+	igt_system_suspend_autoresume(SUSPEND_STATE_S3, SUSPEND_TEST_NONE);
+	powergate_info(fd, gt);
+}
+
+static void toggle_gt_cpg(int fd)
+{
+	int gt;
+
+	xe_for_each_gt(fd, gt)
+		powergate_info(fd, gt);
+
+	fw_handle = igt_debugfs_open(fd, "forcewake_all", O_RDONLY);
+	igt_assert_lte(0, fw_handle);
+	xe_for_each_gt(fd, gt)
+		powergate_status(fd, gt, "up");
+
+	close(fw_handle);
+	sleep(1);
+	xe_for_each_gt(fd, gt)
+		powergate_status(fd, gt, "down");
+}
+
 igt_main
 {
 	uint32_t d3cold_allowed;
@@ -380,6 +467,17 @@ igt_main
 		toggle_gt_c6(fd, NUM_REPS);
 	}
 
+	igt_describe("Validate Coarse power gating status during suspend cycle");
+	igt_subtest("cpg-basic")
+		xe_for_each_gt(fd, gt)
+			cpg_basic(fd, gt);
+
+	igt_describe("Toggle GT coarse power gating states by managing forcewake");
+	igt_subtest("toggle-gt-cpg") {
+		igt_install_exit_handler(close_fw_handle);
+		toggle_gt_cpg(fd);
+	}
+
 	igt_fixture {
 		close(fd);
 	}
-- 
2.34.1