[RFC i-g-t 1/4] igt_aux: Add igt_skip_without_suspend_support()

[Lyude <lyude@redhat.com>]

Since all of the chamelium calls are blocking, we need to be able to
make suspend/resume tests with it multi-threaded. As such, it's not the
best idea to rely on igt_system_suspend_autoresume() for skipping tests
on systems without suspend/resume support since we could accidentally
leave the thread controlling the chamelium running after the test gets
skipped.

Signed-off-by: Lyude <lyude@redhat.com>
---
 lib/igt_aux.c | 21 +++++++++++++++++++++
 lib/igt_aux.h |  2 ++
 2 files changed, 23 insertions(+)

diff --git a/lib/igt_aux.c b/lib/igt_aux.c
index 421f6d4..9754148 100644
--- a/lib/igt_aux.c
+++ b/lib/igt_aux.c
@@ -743,6 +743,27 @@ static uint32_t get_supported_suspend_states(int power_dir)
 }
 
 /**
+ * igt_skip_without_suspend_state:
+ * @state: an #igt_suspend_state to check for
+ *
+ * Check whether or not the system supports the given @state, and skip the
+ * current test if it doesn't. Useful for tests we want to skip before
+ * attempting to call #igt_system_suspend_autoresume.
+ */
+void igt_skip_without_suspend_support(enum igt_suspend_state state,
+				      enum igt_suspend_test test)
+{
+	int power_dir;
+
+	igt_require((power_dir = open("/sys/power", O_RDONLY)) >= 0);
+	igt_require(get_supported_suspend_states(power_dir) & (1 << state));
+	igt_require(test == SUSPEND_TEST_NONE ||
+		    faccessat(power_dir, "pm_test", R_OK | W_OK, 0) == 0);
+
+	close(power_dir);
+}
+
+/**
  * igt_system_suspend_autoresume:
  * @state: an #igt_suspend_state, the target suspend state
  * @test: an #igt_suspend_test, test point at which to complete the suspend
diff --git a/lib/igt_aux.h b/lib/igt_aux.h
index d30196b..973a9cd 100644
--- a/lib/igt_aux.h
+++ b/lib/igt_aux.h
@@ -170,6 +170,8 @@ enum igt_suspend_test {
 	SUSPEND_TEST_NUM,
 };
 
+void igt_skip_without_suspend_support(enum igt_suspend_state state,
+				      enum igt_suspend_test test);
 void igt_system_suspend_autoresume(enum igt_suspend_state state,
 				   enum igt_suspend_test test);
 
-- 
2.7.4

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