[PATCH i-g-t] tests/intel/xe_fault_injection: Suppress Guc CT dumps during fault injection

[Satyanarayana K V P]

When injecting fault to xe_guc_ct_send_recv() & xe_guc_mmio_send_recv()
functions, the CI test systems are going out of space and crashing. To
avoid this issue, a new helper function is created and when fault is injected
into this xe_should_fail_ct_dead_capture() helper function, ct dead capture is
avoided which suppresses ct dumps in the log.

Inject fault into xe_should_fail_ct_dead_capture() function along with
xe_guc_ct_send_recv() & xe_guc_mmio_send_recv() to suppress GUC ct dumps.

Signed-off-by: Satyanarayana K V P <satyanarayana.k.v.p at intel.com>
Suggested-by: John Harrison <John.C.Harrison at Intel.com>
Tested-by: Aditya Chauhan <aditya.chauhan at intel.com>
---
Cc: Francois Dugast <francois.dugast at intel.com>
Cc: Lukasz Laguna <lukasz.laguna at intel.com>

Test-with: 20250429134649.4747-1-satyanarayana.k.v.p at intel.com
---
 tests/intel/xe_fault_injection.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/tests/intel/xe_fault_injection.c b/tests/intel/xe_fault_injection.c
index 602e4cb39..82d730a7c 100644
--- a/tests/intel/xe_fault_injection.c
+++ b/tests/intel/xe_fault_injection.c
@@ -121,6 +121,22 @@ static void injection_list_add(const char function_name[])
 	close(dir);
 }
 
+static void injection_list_append(const char function_name[])
+{
+	int dir, fd, ret;
+
+	dir = fail_function_open();
+	igt_assert_lte(0, dir);
+
+	fd = openat(dir, "inject", O_WRONLY | O_APPEND);
+	ret = write(fd, function_name, strlen(function_name));
+
+	close(fd);
+	close(dir);
+
+	igt_assert_lte(0, ret);
+}
+
 static void injection_list_remove(const char function_name[])
 {
 	int dir;
@@ -234,6 +250,10 @@ inject_fault_probe(int fd, char pci_slot[], const char function_name[])
 
 	ignore_faults_in_dmesg(function_name);
 	injection_list_add(function_name);
+	if (!strcmp(function_name, "xe_guc_ct_send_recv") ||
+	    !strcmp(function_name, "xe_guc_mmio_send_recv"))
+		injection_list_append("xe_should_fail_ct_dead_capture");
+
 	set_retval(function_name, INJECT_ERRNO);
 
 	igt_kmod_bind("xe", pci_slot);
@@ -271,6 +291,8 @@ static void probe_fail_guc(int fd, char pci_slot[], const char function_name[],
 	for (int i = iter_start; i < iter_end; i++) {
 		fault_params->space = i;
 		setup_injection_fault(fault_params);
+		/* Clear the injection list  */
+		injection_list_clear();
 		inject_fault_probe(fd, pci_slot, function_name);
 		igt_kmod_unbind("xe", pci_slot);
 	}
-- 
2.43.0