[PATCH 03/49] drm/i915: for_each_ring

oscar.mateo
2014-03-27T17:12:06Z

From: Ben Widawsky <benjamin.widawsky@intel.com>

for_each_ring() iterates over all rings supported by the hardware, not
just those which have been initialized as in for_each_active_ring()

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Acked-by: Oscar Mateo <oscar.mateo@intel.com>
---
drivers/gpu/drm/i915/i915_drv.h | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 57bf4a7..488d406 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1469,6 +1469,17 @@ static inline struct drm_i915_private *to_i915(const struct drm_device *dev)
return dev->dev_private;
}

+/* NB: Typically you want to use for_each_ring in init code before ringbuffers
+ * are setup, or in debug code. for_each_active_ring is more suited for code
+ * which is dynamically handling active rings, ie. normal code. In most
+ * (currently all cases except on pre-production hardware) for_each_ring will
+ * work even if it's a bad idea to use it - so be careful.
+ */
+#define for_each_ring(ring__, dev_priv__, i__) \
+ for ((i__) = 0; (i__) < I915_NUM_RINGS; (i__)++) \
+ if (((ring__) = &(dev_priv__)->ring[(i__)]), \
+ INTEL_INFO((dev_priv__)->dev)->ring_mask & (1<<(i__)))
+
/* Iterate over initialised rings */
#define for_each_active_ring(ring__, dev_priv__, i__) \
for ((i__) = 0; (i__) < I915_NUM_RINGS; (i__)++) \
--
1.9.0