svn commit: r305711 - head/sys/dev/ioat

Conrad E. Meyer cem at FreeBSD.org
Sun Sep 11 20:15:43 UTC 2016


Author: cem
Date: Sun Sep 11 20:15:41 2016
New Revision: 305711
URL: https://svnweb.freebsd.org/changeset/base/305711

Log:
  ioat(4): Start poll timer when descriptors are released to HW
  
  Rather than when the software creates the descriptors.
  
  Sponsored by:	Dell EMC Isilon

Modified:
  head/sys/dev/ioat/ioat.c

Modified: head/sys/dev/ioat/ioat.c
==============================================================================
--- head/sys/dev/ioat/ioat.c	Sun Sep 11 20:14:19 2016	(r305710)
+++ head/sys/dev/ioat/ioat.c	Sun Sep 11 20:15:41 2016	(r305711)
@@ -949,6 +949,13 @@ ioat_release(bus_dmaengine_t dmaengine)
 	ioat = to_ioat_softc(dmaengine);
 	CTR2(KTR_IOAT, "%s channel=%u", __func__, ioat->chan_idx);
 	ioat_write_2(ioat, IOAT_DMACOUNT_OFFSET, (uint16_t)ioat->hw_head);
+
+	if (!ioat->is_completion_pending) {
+		ioat->is_completion_pending = TRUE;
+		callout_reset(&ioat->poll_timer, 1, ioat_poll_timer_callback,
+		    ioat);
+		callout_stop(&ioat->shrink_timer);
+	}
 	mtx_unlock(&ioat->submit_lock);
 }
 
@@ -1788,13 +1795,6 @@ ioat_submit_single(struct ioat_softc *io
 	atomic_add_rel_int(&ioat->head, 1);
 	atomic_add_rel_int(&ioat->hw_head, 1);
 
-	if (!ioat->is_completion_pending) {
-		ioat->is_completion_pending = TRUE;
-		callout_reset(&ioat->poll_timer, 1, ioat_poll_timer_callback,
-		    ioat);
-		callout_stop(&ioat->shrink_timer);
-	}
-
 	ioat->stats.descriptors_submitted++;
 }
 


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