[PATCH] tests/intel/xe_configfs: Add i2c adapter check in survivability mode

[Sk Anirban]

Add i2c adapter presence check in survivability mode to ensure
the Add-In Management Controller (AMC) can receive firmware updates
when the device is in survivability mode.

Signed-off-by: Sk Anirban <sk.anirban at intel.com>
---
 tests/intel/xe_configfs.c | 50 ++++++++++++++++++++++++++++++++++-----
 1 file changed, 44 insertions(+), 6 deletions(-)

diff --git a/tests/intel/xe_configfs.c b/tests/intel/xe_configfs.c
index 5c65cd01d..a3af84b6a 100644
--- a/tests/intel/xe_configfs.c
+++ b/tests/intel/xe_configfs.c
@@ -2,7 +2,9 @@
 /*
  * Copyright © 2025 Intel Corporation
  */
+#include <dirent.h>
 #include <limits.h>
+#include <fcntl.h>
 
 #include "igt.h"
 #include "igt_configfs.h"
@@ -24,6 +26,34 @@
 
 static char bus_addr[NAME_MAX];
 
+static int find_i2c_adapter(struct pci_device *pci_xe)
+{
+	char device_path[PATH_MAX];
+	struct dirent *dirent;
+	int i2c_adapter = -1;
+	DIR *device_dir;
+
+	igt_require(igt_kmod_load("i2c-dev", NULL) == 0);
+
+	snprintf(device_path, sizeof(device_path), "/sys/bus/pci/devices/%s/%s.%hu", bus_addr,
+		 "i2c_designware", (pci_xe->bus << 8) | (pci_xe->dev));
+	device_dir = opendir(device_path);
+
+	if (!device_dir)
+		return -1;
+
+	while ((dirent = readdir(device_dir))) {
+		if (strncmp(dirent->d_name, "i2c-", 4) == 0) {
+			sscanf(dirent->d_name, "i2c-%d", &i2c_adapter);
+			closedir(device_dir);
+			return i2c_adapter;
+		}
+	}
+
+	closedir(device_dir);
+	return i2c_adapter;
+}
+
 static void restore(int sig)
 {
 	/* Restore after survivability mode */
@@ -42,10 +72,12 @@ static void set_survivability_mode(int configfs_device_fd, bool value)
  * SUBTEST: survivability-mode
  * Description: Validate survivability mode by setting configfs
  */
-static void test_survivability_mode(int configfs_device_fd)
+static void test_survivability_mode(int configfs_device_fd, struct pci_device *pci_xe)
 {
 	char path[PATH_MAX];
-	int fd;
+	int file_fd, i2c_adapter;
+
+	i2c_adapter = find_i2c_adapter(pci_xe);
 
 	/* Enable survivability mode */
 	set_survivability_mode(configfs_device_fd, true);
@@ -53,9 +85,13 @@ static void test_survivability_mode(int configfs_device_fd)
 	/* check presence of survivability mode sysfs */
 	snprintf(path, PATH_MAX, "/sys/bus/pci/devices/%s/survivability_mode", bus_addr);
 
-	fd = open(path, O_RDONLY);
-	igt_assert_f(fd >= 0, "Survivability mode not set\n");
-	close(fd);
+	file_fd = open(path, O_RDONLY);
+	igt_assert_f(file_fd >= 0, "Survivability mode not set\n");
+
+	if (i2c_adapter >= 0)
+		igt_assert_f(find_i2c_adapter(pci_xe) >= 0, "Failed to find i2c adapter in survivability mode\n");
+
+	close(file_fd);
 }
 
 /**
@@ -120,9 +156,11 @@ static int create_device_configfs_group(int configfs_fd, int fd)
 igt_main
 {
 	int fd, configfs_fd, configfs_device_fd;
+	struct pci_device *pci_xe;
 
 	igt_fixture {
 		fd = drm_open_driver(DRIVER_XE);
+		pci_xe = igt_device_get_pci_device(fd);
 		configfs_fd = igt_configfs_open("xe");
 		igt_require(configfs_fd != -1);
 		configfs_device_fd = create_device_configfs_group(configfs_fd, fd);
@@ -132,7 +170,7 @@ igt_main
 	igt_subtest("survivability-mode") {
 		igt_require(IS_BATTLEMAGE(intel_get_drm_devid(fd)));
 		igt_install_exit_handler(restore);
-		test_survivability_mode(configfs_device_fd);
+		test_survivability_mode(configfs_device_fd, pci_xe);
 	}
 
 	igt_describe("Validate engines_allowed with invalid options");
-- 
2.43.0