[PATCH i-g-t] [RFC] Add support to force specific module load

[Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>]

This patch adds a new option to force the use of a module specified from
the command line.  The force command expects a module name which will be
used on the target test (changing the standard behavior). This feature
can be useful for developers that have to create a new module since it
is possible to use some of the tests already provided by IGT (e.g.,
kms_color, core, etc.) as a start point. Additionally, it can
also be useful for someone that wants to implement a new set of tests
for a specific driver because the developer can first check the behavior
of any test in the target module. It is important to highlight, that a
force option can produce unexpected results and developers should be
aware of that.

Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
---
 lib/drmtest.c        | 19 +++++++++++++------
 lib/igt_core.c       | 20 ++++++++++++++++++++
 lib/igt_core.h       |  4 ++++
 scripts/run-tests.sh |  4 +++-
 4 files changed, 40 insertions(+), 7 deletions(-)

diff --git a/lib/drmtest.c b/lib/drmtest.c
index fae6f86f..1d2ba178 100644
--- a/lib/drmtest.c
+++ b/lib/drmtest.c
@@ -258,6 +258,7 @@ static int __open_device(const char *base, int offset, unsigned int chipset)
 static int __open_driver(const char *base, int offset, unsigned int chipset)
 {
 	static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+	const char* target;
 	static const struct module {
 		unsigned int bit;
 		const char *module;
@@ -276,13 +277,19 @@ static int __open_driver(const char *base, int offset, unsigned int chipset)
 	if (fd != -1)
 		return fd;
 
+	target = get_target_module();
+
 	pthread_mutex_lock(&mutex);
-	for (const struct module *m = modules; m->module; m++) {
-		if (chipset & m->bit) {
-			if (m->modprobe)
-				m->modprobe(m->module);
-			else
-				modprobe(m->module);
+	if (target) {
+		modprobe(target);
+	} else {
+		for (const struct module *m = modules; m->module; m++) {
+			if (chipset & m->bit) {
+				if (m->modprobe)
+					m->modprobe(m->module);
+				else
+					modprobe(m->module);
+			}
 		}
 	}
 	pthread_mutex_unlock(&mutex);
diff --git a/lib/igt_core.c b/lib/igt_core.c
index 5092a3f0..ed66eae1 100644
--- a/lib/igt_core.c
+++ b/lib/igt_core.c
@@ -286,6 +286,7 @@ enum {
  OPT_DESCRIPTION,
  OPT_DEBUG,
  OPT_INTERACTIVE_DEBUG,
+ OPT_FORCE_MODULE,
  OPT_HELP = 'h'
 };
 
@@ -303,6 +304,20 @@ static pthread_mutex_t log_buffer_mutex = PTHREAD_MUTEX_INITIALIZER;
 GKeyFile *igt_key_file;
 #endif
 
+char *target_module;
+
+void set_target_module(char *target)
+{
+  if (!target)
+    igt_warn("No module specified, keep default behaviour");
+  target_module = target;
+}
+
+const char *get_target_module(void)
+{
+  return target_module;
+}
+
 char *igt_frame_dump_path;
 
 const char *igt_test_name(void)
@@ -555,6 +570,7 @@ static void print_usage(const char *help_str, bool output_on_stderr)
 		   "  --debug[=log-domain]\n"
 		   "  --interactive-debug[=domain]\n"
 		   "  --help-description\n"
+		   "  --force-module <module>\n"
 		   "  --help\n");
 	if (help_str)
 		fprintf(f, "%s\n", help_str);
@@ -666,6 +682,7 @@ static int common_init(int *argc, char **argv,
 		{"debug", optional_argument, 0, OPT_DEBUG},
 		{"interactive-debug", optional_argument, 0, OPT_INTERACTIVE_DEBUG},
 		{"help", 0, 0, OPT_HELP},
+		{"force-module", required_argument, 0, OPT_FORCE_MODULE},
 		{0, 0, 0, 0}
 	};
 	char *short_opts;
@@ -763,6 +780,9 @@ static int common_init(int *argc, char **argv,
 			print_test_description();
 			ret = -1;
 			goto out;
+		case OPT_FORCE_MODULE:
+			set_target_module(strdup(optarg));
+			break;
 		case OPT_HELP:
 			print_usage(help_str, false);
 			ret = -1;
diff --git a/lib/igt_core.h b/lib/igt_core.h
index bf8cd66c..6d635ebd 100644
--- a/lib/igt_core.h
+++ b/lib/igt_core.h
@@ -50,6 +50,10 @@ extern const char* __igt_test_description __attribute__((weak));
 extern bool __igt_plain_output;
 extern char *igt_frame_dump_path;
 
+extern char *target_module;
+void set_target_module(char *target);
+const char *get_target_module(void);
+
 /**
  * IGT_TEST_DESCRIPTION:
  * @str: description string
diff --git a/scripts/run-tests.sh b/scripts/run-tests.sh
index 4209dd8c..c810a8dd 100755
--- a/scripts/run-tests.sh
+++ b/scripts/run-tests.sh
@@ -80,6 +80,7 @@ function print_help {
 	echo "                  (can be used more than once)"
 	echo "  -T <filename>   run tests listed in testlist"
 	echo "                  (overrides -t and -x)"
+	echo "  -m <module>     force load a specific module"
 	echo "  -v              enable verbose mode"
 	echo "  -x <regex>      exclude tests that match the regular expression"
 	echo "                  (can be used more than once)"
@@ -91,7 +92,7 @@ function print_help {
 	echo "Useful patterns for test filtering are described in the API documentation."
 }
 
-while getopts ":dhlr:st:T:vx:Rn" opt; do
+while getopts ":dhlr:st:T:m:vx:Rn" opt; do
 	case $opt in
 		d) download_piglit; exit ;;
 		h) print_help; exit ;;
@@ -100,6 +101,7 @@ while getopts ":dhlr:st:T:vx:Rn" opt; do
 		s) SUMMARY="html" ;;
 		t) FILTER="$FILTER -t $OPTARG" ;;
 		T) FILTER="$FILTER --test-list $OPTARG" ;;
+		m) FILTER="$FILTER -m $OPTARG" ;;
 		v) VERBOSE="-v" ;;
 		x) EXCLUDE="$EXCLUDE -x $OPTARG" ;;
 		R) RESUME="true" ;;
-- 
2.17.0

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