[PATCH i-g-t v3 2/2] tests/intel/xe_eudebug: Add subtests for eudebug/SR-IOV exclusion

[Christoph Manszewski]

Eudebug is not supported in PF mode with VFs enabled and in VF mode.
Provide subtests to ensure that:
  1. enabling eudebug is not permitted in PF mode with VFs enabled
  2. eudebug sysfs toggle is not available in VF mode
  3. enabling VFs is not permitted when eudebug is enabled

Signed-off-by: Christoph Manszewski <christoph.manszewski at intel.com>
---
 tests/intel/xe_eudebug_sriov.c | 148 +++++++++++++++++++++++++++++++++
 tests/meson.build              |   1 +
 2 files changed, 149 insertions(+)
 create mode 100644 tests/intel/xe_eudebug_sriov.c

diff --git a/tests/intel/xe_eudebug_sriov.c b/tests/intel/xe_eudebug_sriov.c
new file mode 100644
index 000000000..eb13981bc
--- /dev/null
+++ b/tests/intel/xe_eudebug_sriov.c
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2025 Intel Corporation
+ */
+
+/**
+ * TEST: Test EU Debugger and SR-IOV interaction
+ * Category: Core
+ * Mega feature: EUdebug/SR-IOV
+ * Sub-category: EUdebug tests
+ * Functionality: EU Debugger framework
+ * Test category: functionality test
+ */
+
+#include "igt.h"
+#include "igt_sysfs.h"
+#include "lib/igt_sriov_device.h"
+#include "xe/xe_eudebug.h"
+
+static bool has_vf_enable_eudebug_attr(int fd, unsigned int vf_num)
+{
+	char path[PATH_MAX];
+	int sysfs;
+	bool ret;
+
+	igt_assert(vf_num > 0);
+
+	sysfs = igt_sysfs_open(fd);
+	igt_assert_fd(sysfs);
+	/* vf_num is 1-based, but virtfn is 0-based */
+	snprintf(path, sizeof(path), "device/virtfn%u/enable_eudebug", vf_num - 1);
+	ret = igt_sysfs_has_attr(sysfs, path);
+	close(sysfs);
+
+	return ret;
+}
+
+/**
+ * SUBTEST: deny-eudebug
+ * Description:
+ *	Check that eudebug toggle is not available for VFs, and that enabling
+ *	eudebug with VFs enabled is not permitted.
+ */
+static void test_deny_eudebug(int fd)
+{
+	unsigned int num_vfs = igt_sriov_get_total_vfs(fd);
+	bool err = false;
+	int sysfs;
+
+	igt_debug("Testing %u VFs\n", num_vfs);
+
+	xe_eudebug_enable(fd, false);
+	igt_sriov_enable_driver_autoprobe(fd);
+	igt_sriov_enable_vfs(fd, num_vfs);
+	igt_assert_eq(num_vfs, igt_sriov_get_enabled_vfs(fd));
+
+	for (int vf_num = 1; vf_num <= num_vfs; ++vf_num) {
+		if (!igt_sriov_is_vf_drm_driver_probed(fd, vf_num)) {
+			igt_debug("VF%u probe failed\n", vf_num);
+			err = true;
+		} else if (has_vf_enable_eudebug_attr(fd, vf_num)) {
+			igt_debug("VF%u has enable_eudebug attribute\n", vf_num);
+			err = true;
+		}
+	}
+
+	igt_assert(!err);
+
+	sysfs = igt_sysfs_open(fd);
+	igt_assert_fd(sysfs);
+	igt_assert_eq(igt_sysfs_printf(sysfs, "device/enable_eudebug", "1"), -EPERM);
+	close(sysfs);
+}
+
+/**
+ * SUBTEST: deny-sriov
+ * Description:
+ *	Check that VFs cannot be enabled when eudebug is enabled.
+ */
+static void test_deny_sriov(int fd)
+{
+	unsigned int num_vfs = igt_sriov_get_total_vfs(fd);
+	int sysfs = 0;
+
+	igt_debug("Testing %u VFs\n", num_vfs);
+
+	igt_sriov_disable_vfs(fd);
+	igt_assert_eq(0, igt_sriov_get_enabled_vfs(fd));
+	xe_eudebug_enable(fd, true);
+
+	sysfs = igt_sysfs_open(fd);
+	igt_assert_fd(sysfs);
+	igt_assert_eq(igt_sysfs_printf(sysfs, "device/sriov_numvfs", "%u", num_vfs), -EPERM);
+	close(sysfs);
+}
+
+static void restore_initial_driver_state(int fd, bool eudebug_enabled, bool vf_autoprobe)
+{
+	bool abort = false;
+
+	igt_sriov_disable_vfs(fd);
+	if (igt_sriov_get_enabled_vfs(fd) > 0) {
+		igt_debug("Failed to disable VF(s)\n");
+		abort = true;
+	}
+
+	vf_autoprobe ? igt_sriov_enable_driver_autoprobe(fd) :
+		       igt_sriov_disable_driver_autoprobe(fd);
+	if (vf_autoprobe != igt_sriov_is_driver_autoprobe_enabled(fd)) {
+		igt_debug("Failed to restore sriov_drivers_autoprobe value\n");
+		abort = true;
+	}
+
+	if (__xe_eudebug_enable_getset(fd, NULL, &eudebug_enabled) < 0) {
+		igt_debug("Failed to restore eudebug state\n");
+		abort = true;
+	}
+
+	/* abort to avoid execution of next tests with invalid driver state */
+	igt_abort_on_f(abort, "Failed to restore initial driver state\n");
+}
+
+igt_main
+{
+	bool eudebug_enabled;
+	bool vf_autoprobe;
+	int fd;
+
+	igt_fixture {
+		fd = drm_open_driver(DRIVER_XE);
+		igt_require(igt_sriov_is_pf(fd));
+		igt_require(igt_sriov_vfs_supported(fd));
+		igt_require(igt_sriov_get_enabled_vfs(fd) == 0);
+		igt_require(__xe_eudebug_enable_getset(fd, &eudebug_enabled, NULL) == 0);
+		vf_autoprobe = igt_sriov_is_driver_autoprobe_enabled(fd);
+	}
+
+	igt_subtest("deny-eudebug")
+		test_deny_eudebug(fd);
+
+	igt_subtest("deny-sriov")
+		test_deny_sriov(fd);
+
+	igt_fixture {
+		restore_initial_driver_state(fd, eudebug_enabled, vf_autoprobe);
+		close(fd);
+	}
+}
diff --git a/tests/meson.build b/tests/meson.build
index 711eb899a..a2db178fb 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -333,6 +333,7 @@ intel_xe_eudebug_progs = [
 	'xe_eudebug',
 	'xe_exec_sip_eudebug',
 	'xe_eudebug_online',
+	'xe_eudebug_sriov',
 ]
 
 if build_xe_eudebug
-- 
2.34.1