[PATCH v3] tests/intel/xe_fault_injection: Ignore expected errors

[Jonathan Cavitt]

The following errors can be observed when running the xe_fault_injection
subtests:

[drm] *ERROR* GT0: GuC init failed with -ENOMEM
[drm] *ERROR* GT0: Failed to initialize uC (-ENOMEM)
probe with driver xe failed with error -12

Add these messages to the dmesg ignore regex to the applicable tests
(specifically, all tests for the last error, and all tests that target
GuC subsystems for the first two errors).

v2:
- Fix and merge regex (Kamil)

v3:
- Rebase change to be compatible with latest revision (Kamil)

Closes: https://gitlab.freedesktop.org/drm/xe/kernel/issues/3343
Signed-off-by: Jonathan Cavitt <jonathan.cavitt at intel.com>
CC: Francois Dugast <francois.dugast at intel.com>
CC: Lucas De Marchi <lucas.demarchi at intel.com>
CC: Matthew Brost <matthew.brost at intel.com>
CC: Rodrigo Vivi <rodrigo.vivi at intel.com>
CC: Michal Wajdeczko <michal.wajdeczko at intel.com>
CC: Kamil Konieczny <kamil.konieczny at linux.intel.com>
---
 tests/intel/xe_fault_injection.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/tests/intel/xe_fault_injection.c b/tests/intel/xe_fault_injection.c
index 1b29041745..7d6c902761 100644
--- a/tests/intel/xe_fault_injection.c
+++ b/tests/intel/xe_fault_injection.c
@@ -50,6 +50,30 @@ static int fail_function_open(void)
 	return debugfs_fail_function_dir_fd;
 }
 
+static bool function_is_part_of_guc(const char function_name[])
+{
+	return strstr(function_name, "_guc_") != NULL ||
+	       strstr(function_name, "_uc_") != NULL ||
+	       strstr(function_name, "_wopcm_") != NULL;
+}
+
+static void ignore_faults_in_dmesg(const char function_name[])
+{
+	/* Driver probe is expected to fail in all cases, so ignore in igt_runner */
+	char regex[1024] = "probe with driver xe failed with error -12";
+
+	/*
+	 * If GuC module fault is injected, GuC is expected to fail,
+	 * so also ignore GuC init failures in igt_runner.
+	 */
+	if (function_is_part_of_guc(function_name)) {
+		strcat(regex, "|GT[0-9a-fA-F]*: GuC init failed with -ENOMEM");
+		strcat(regex, "|GT[0-9a-fA-F]*: Failed to initialize uC .-ENOMEM");
+	}
+
+	igt_emit_ignore_dmesg_regex(regex);
+}
+
 /*
  * The injectable file requires CONFIG_FUNCTION_ERROR_INJECTION in kernel.
  */
@@ -152,6 +176,7 @@ inject_fault_probe(int fd, char pci_slot[], const char function_name[])
 	igt_info("Injecting error \"%s\" (%d) in function \"%s\"\n",
 		 strerror(-INJECT_ERRNO), INJECT_ERRNO, function_name);
 
+	ignore_faults_in_dmesg(function_name);
 	injection_list_do(INJECTION_LIST_ADD, function_name);
 	set_retval(function_name, INJECT_ERRNO);
 	xe_sysfs_driver_do(fd, pci_slot, XE_SYSFS_DRIVER_TRY_BIND);
@@ -184,6 +209,7 @@ vm_create_fail(int fd, const char function_name[], unsigned int flags)
 {
 	igt_assert_eq(simple_vm_create(fd, flags), 0);
 
+	ignore_faults_in_dmesg(function_name);
 	injection_list_do(INJECTION_LIST_ADD, function_name);
 	set_retval(function_name, INJECT_ERRNO);
 	igt_assert(simple_vm_create(fd, flags) != 0);
@@ -243,6 +269,7 @@ vm_bind_fail(int fd, const char function_name[])
 
 	igt_assert_eq(simple_vm_bind(fd, vm), 0);
 
+	ignore_faults_in_dmesg(function_name);
 	injection_list_do(INJECTION_LIST_ADD, function_name);
 	set_retval(function_name, INJECT_ERRNO);
 	igt_assert(simple_vm_bind(fd, vm) != 0);
-- 
2.43.0