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[03/49] drm/i915: for_each_ring

Message ID 1395943218-7708-4-git-send-email-oscar.mateo@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

oscar.mateo@intel.com March 27, 2014, 5:59 p.m. UTC 
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 mbox

Patch

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__)++) \