lib/debugfs: Fix wraparound handling for crc frame counter check

Deal with frame counter wraparound correcrtly.

v2: Make the comparison functions available for everyone (Chris)
    Add some docs (gtk-doc seems obtuse so not 100% warning free)

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> #v1
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 60 insertions, 0 deletions

diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index a29ad783..3c602576 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -767,4 +767,64 @@ void igt_cleanup_hotplug(struct udev_monitor *mon);
 bool igt_display_has_format_mod(igt_display_t *display, uint32_t format, uint64_t modifier);
 bool igt_plane_has_format_mod(igt_plane_t *plane, uint32_t format, uint64_t modifier);
 
+/**
+ * igt_vblank_after_eq:
+ * @a: First vblank sequence number.
+ * @b: Second vblank sequence number.
+ *
+ * Compare vblank sequence numbers,
+ * handling wraparound correctly.
+ *
+ * Returns: @a >= @b
+ */
+static inline bool igt_vblank_after_eq(uint32_t a, uint32_t b)
+{
+	return (int32_t)(a - b) >= 0;
+}
+
+/**
+ * igt_vblank_before_eq:
+ * @a: First vblank sequence number.
+ * @b: Second vblank sequence number.
+ *
+ * Compare vblank sequence numbers,
+ * handling wraparound correctly.
+ *
+ * Returns: @a <= @b
+ */
+static inline bool igt_vblank_before_eq(uint32_t a, uint32_t b)
+{
+	return igt_vblank_after_eq(b, a);
+}
+
+/**
+ * igt_vblank_after:
+ * @a: First vblank sequence number.
+ * @b: Second vblank sequence number.
+ *
+ * Compare vblank sequence numbers,
+ * handling wraparound correctly.
+ *
+ * Returns: @a > @b
+ */
+static inline bool igt_vblank_after(uint32_t a, uint32_t b)
+{
+	return (int32_t)(b - a) < 0;
+}
+
+/**
+ * igt_vblank_before:
+ * @a: First vblank sequence number.
+ * @b: Second vblank sequence number.
+ *
+ * Compare vblank sequence numbers,
+ * handling wraparound correctly.
+ *
+ * Returns: @a < @b
+ */
+static inline bool igt_vblank_before(uint32_t a, uint32_t b)
+{
+	return igt_vblank_after(b, a);
+}
+
 #endif /* __IGT_KMS_H__ */