[i-g-t, v5, 1/2] tests/intel/xe_pm_residency: Add GT coarse power gating validation

[sk.anirban@intel.com]

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

Implement test cpg-basic to validate coarse power gating status
after S3 cycle.
Add test cpg-gt-toggle 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 test cpg-gt-toggle (Riana)

v3: Address cosmetic review comments (Riana)
    Fix commit message & test name (Konieczny)

v4: Address cosmetic review comments (Riana)

v5: Remove unnecessary openings and assertions of gt directories (Riana)

Signed-off-by: Sk Anirban <sk.anirban@intel.com>
---
 tests/intel/xe_pm_residency.c | 80 +++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)

diff --git a/tests/intel/xe_pm_residency.c b/tests/intel/xe_pm_residency.c
index 772fe9b57..d4b26b231 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 S3 cycle.
+ *
+ * SUBTEST: cpg-gt-toggle
+ * Description: Toggle GT coarse power gating states by acquiring/releasing forcewake.
  */
 IGT_TEST_DESCRIPTION("Tests for gtidle properties");
 
@@ -317,6 +323,69 @@ static void toggle_gt_c6(int fd, int n)
 			     "Power consumed in GT C6 should be lower than GT C0\n");
 }
 
+static void cpg_enabled(int fd, int gt)
+{
+	const char *render_power_gating = "Render Power Gating Enabled: ";
+	const char *media_power_gating = "Media Power Gating Enabled: ";
+	char str[512], path[PATH_MAX], *render_substr, *media_substr;
+
+	snprintf(path, sizeof(path), "gt%d/powergate_info", gt);
+	igt_debugfs_read(fd, path, str);
+
+	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");
+}
+
+static void powergate_status(int fd, int gt, const char *expected_status)
+{
+	const char *power_gate_status = "Power Gate Status: ";
+	char str[512], path[PATH_MAX], *status_substr;
+
+	snprintf(path, sizeof(path), "gt%d/powergate_info", gt);
+	igt_debugfs_read(fd, path, str);
+
+	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);
+	}
+}
+
+static void cpg_basic(int fd, int gt)
+{
+	cpg_enabled(fd, gt);
+	igt_system_suspend_autoresume(SUSPEND_STATE_S3, SUSPEND_TEST_NONE);
+	cpg_enabled(fd, gt);
+}
+
+static void cpg_gt_toggle(int fd)
+{
+	int gt;
+
+	fw_handle = igt_debugfs_open(fd, "forcewake_all", O_RDONLY);
+	igt_assert_lte(0, fw_handle);
+
+	xe_for_each_gt(fd, gt) {
+		cpg_enabled(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 +449,17 @@ igt_main
 		toggle_gt_c6(fd, NUM_REPS);
 	}
 
+	igt_describe("Validate Coarse power gating status with S3 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("cpg-gt-toggle") {
+		igt_install_exit_handler(close_fw_handle);
+		cpg_gt_toggle(fd);
+	}
+
 	igt_fixture {
 		close(fd);
 	}
-- 
2.34.1