lib: move i915_wedged_set to ig_gt.c

Upcoming tests will call it to recover from bad states caused by
hangcheck bugs.the function was renamed to igt_force_gpu_reset to have a
naming closer to other hang-related functions in the same file.

The value written to the debugfs has also been changed to -1; this makes
no differences with the current implementation but copes with upcoming
TDR changes (still under discussion) that should allow the resetting of
a mask of rings.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>

lib/igt_gt.c

@@ -269,6 +269,29 @@ void igt_post_hang_ring(int fd, struct igt_hang_ring arg)
 	}
 }
 
+/**
+ * igt_force_gpu_reset:
+ *
+ * forces a gpu reset using the i915_wedged debugfs interface. To be used to
+ * recover from situations where the hangcheck didn't trigger and/or the gpu is
+ * stuck, either because the test manually disabled gpu resets or because the
+ * test hit an hangcheck bug
+ */
+void igt_force_gpu_reset(void)
+{
+	int fd, ret;
+
+	igt_debug("Triggering GPU reset\n");
+
+	fd = igt_debugfs_open("i915_wedged", O_RDWR);
+	igt_require(fd >= 0);
+
+	ret = write(fd, "-1\n", 3);
+	close(fd);
+
+	igt_assert_eq(ret, 3);
+}
+
 /* GPU abusers */
 static struct igt_helper_process hang_helper;
 static void __attribute__((noreturn))

lib/igt_gt.h

@@ -48,6 +48,8 @@ struct igt_hang_ring igt_hang_ctx(int fd,
 struct igt_hang_ring igt_hang_ring(int fd, int ring);
 void igt_post_hang_ring(int fd, struct igt_hang_ring arg);
 
+void igt_force_gpu_reset(void);
+
 void igt_fork_hang_helper(void);
 void igt_stop_hang_helper(void);
 

tests/gem_eio.c

@@ -58,24 +58,9 @@ static bool i915_reset_control(bool enable)
 	return ret;
 }
 
-static bool i915_wedged_set(void)
-{
-	int fd, ret;
-
-	igt_debug("Triggering GPU reset\n");
-
-	fd = igt_debugfs_open("i915_wedged", O_RDWR);
-	igt_require(fd >= 0);
-
-	ret = write(fd, "1\n", 2) == 2;
-	close(fd);
-
-	return ret;
-}
-
 static void trigger_reset(int fd)
 {
-	igt_assert(i915_wedged_set());
+	igt_force_gpu_reset();
 
 	/* And just check the gpu is indeed running again */
 	igt_debug("Checking that the GPU recovered\n");